JP6191820B2 - Imaging lens, imaging device, and portable terminal - Google Patents

Description

  The present invention relates to a small imaging lens, and an imaging apparatus and a portable terminal incorporating the same, and more particularly to an imaging lens, an imaging apparatus, and a portable terminal suitable for a low profile having six or more lenses.

  In recent years, with the improvement in performance and miniaturization of imaging devices using solid-state imaging devices such as CCD (Charge Coupled Device) type image sensors or CMOS (Complementary Metal Oxide Semiconductor) type image sensors, Portable information terminals are becoming popular. More recently, with the increase in size and definition of display elements mounted on the above-described portable information terminals and the like, the imaging elements are also required to have higher pixels, and are mounted on these portable information terminals and the like. There is a growing demand for higher performance for imaging lenses. As an imaging lens for such an application, an imaging lens having a five-lens configuration has been proposed. Recently, six or seven lenses having an excellent aberration correction ability compared to a five-lens lens have been proposed for further enhancement of performance (see, for example, Patent Documents 1 and 2).

  On the other hand, there is a strong demand for downsizing of the image pickup apparatus on the other hand, while the demand for downsizing of the image pickup device is strong. In order to achieve both high downsizing and downsizing of the image pickup device, downsizing of the pixel size is progressing. As the pixel size of the image sensor becomes smaller, the amount of light that can be received per pixel decreases accordingly, and noise due to a decrease in the S / N ratio and image degradation due to camera shake that occurs due to a longer exposure time are problematic. Become. In order to solve the problem caused by the decrease in the amount of light that can be received per pixel, a brighter lens is demanded, and recently, a lens having a large aperture of F1.9 or less is demanded. On the other hand, increasing the diameter contributes to an increase in the amount of received light, but leads to the occurrence of monochromatic aberrations such as spherical aberration and coma aberration, and degrades optical performance. The lenses described in Patent Documents 1 and 2 only describe a dark imaging lens of F2.0 or higher, and spherical aberration and coma are not a problem. Considering increasing the diameter of the imaging lens described in Patent Documents 1 and 2 and the like, even if spherical aberration is corrected by adjusting the power arrangement of the lens, it is difficult to correct coma at the same time. This is considered to be a factor that hinders performance.

China Utility Model Publication No. 2028886720 Specification China Utility Model Notification No. 202886713

The present invention has been made in view of such a problem, and while making the imaging lens as small as that of the conventional type, the various apertures are well corrected with a large aperture. An object of the present invention is to provide an imaging lens having a number of sheets or more. Here, although it is a scale of a small imaging lens, the present invention aims at miniaturization at a level satisfying the following expression. By satisfying this range, the entire imaging apparatus can be reduced in size and weight.
L / 2Y <1.00 (7)
However,
L: Distance on the optical axis from the lens surface closest to the object side to the image-side focal point of the entire imaging lens system 2Y: Diagonal length of the imaging surface of the imaging device (diagonal length of the rectangular effective pixel area of the imaging device)
Here, the image side focal point refers to an image point when a parallel light beam parallel to the optical axis is incident on the imaging lens. When a parallel plate such as an optical low-pass filter, an infrared cut filter, or a seal glass of the image pickup device package is disposed between the most image side surface of the image pickup lens and the image side focal position, the parallel plate is used. The part is assumed to be the air conversion distance and the value of L is calculated.

The value L / 2Y is more preferably in the range of the following formula.
L / 2Y <0.95 (7) '

In order to achieve the above object, the imaging lens according to the present invention is composed of 6 to 8 lenses, and the image side surface of the lens arranged closest to the image side is an aspherical surface and has an extreme value within an effective diameter other than the center. The first lens, the second lens, and the third lens that are continuously arranged from the most object side include at least one positive lens and at least one negative lens, and the first, second, and third lenses Among the third lenses, the positive lens having the highest power (absolute value) is set as the main positive lens, the negative lens having the highest power (absolute value) is set as the main negative lens, and a predetermined first lens is provided on the object side of the first lens. A first aperture member having an aperture is disposed, a second aperture member having a predetermined second aperture is disposed between the main negative lens and an adjacent lens, and an image side surface of the main negative lens is a concave surface. There is a smallest surface effective diameter in the entire system, the following conditional expression Meet.
1.5 <Dn / s1 <2.3 (1)
s1 ≧ s2 (2)
1.53 ≦ f123 / f <4.0 (5)
Dn: Distance from the image side surface of the main negative lens to the imaging surface (however, when there is a parallel plate, the parallel plate portion is the air equivalent length)
s1: The aperture diameter of the first aperture member s2: The aperture diameter of the second aperture member, and the smallest aperture diameter when there are a plurality of aperture members that can be regarded as the second aperture member
f123: Composite focal length from the first lens to the third lens
f: Focal length of the entire system Note that, in the above, the power is positive when the light is refracted in a direction approaching the optical axis when a parallel light beam is incident on the lens, and in a direction away from the optical axis. The case of refraction is assumed to have negative power. The effective diameter indicates the passing height of the light beam that passes through the position farthest from the optical axis among the light beam reaching the maximum image height. An extreme value is a point on the aspheric surface where the tangent plane or tangent of the apex of the aspheric surface is a plane or line segment perpendicular to the optical axis in the curve of the lens cross-sectional shape within the effective radius.
As for the value of conditional expression (1), the range of the following expression is more desirable.
1.6 <Dn / s1 <2.2 (1) ′

With the imaging lens according to the present invention, it is possible to achieve a reduction in height while satisfactorily correcting aberrations even with a bright lens having a lens size of F1.9 or less because it is composed of 6 to 8 lenses. . In addition, by setting at least one lens among the first to third lenses close to the object side as a positive lens, the positive lens is arranged at a position close to the object side. Close to the object side, it is advantageous for shortening the optical total length. In addition, by using at least one of the first to third lenses as a negative lens, the negative lens can be arranged at a position where the axial beam diameter is large, which is advantageous for correcting axial chromatic aberration and spherical aberration. become. Furthermore, by making the image side surface of the lens disposed closest to the image side an aspherical surface having an extreme value other than the center within the effective diameter, the incident angle when the light beam of the peripheral image height is incident on the image surface is reduced. Since it can be suppressed, the light receiving efficiency of the sensor when using the image sensor can be improved.
In the imaging lens according to the present invention, the image side surface of the main negative lens is a concave surface, which is the surface having the smallest effective diameter in the entire system. By making the image side surface of the main negative lens concave, it is possible to reduce the angle of incidence on the surface with respect to the axial light beam, thereby reducing the occurrence of spherical aberration. Further, since a strong negative power is exerted with respect to the light beam formed at the peripheral image height, the coma aberration generated in the main positive lens can be corrected well. In addition, by reducing the effective diameter of the main negative lens, even if the main negative lens has a strong power, the inclination of the surface does not become too large at the periphery of the effective diameter. On the other hand, generation of unnecessary spherical aberration and coma aberration can be suppressed.

Conditional expression (1) satisfies the distance Dn from the image side surface of the main negative lens, which is one of the first to third lenses, to the image surface, and the first aperture member disposed on the object side of the first lens. The ratio with the opening diameter s1 of the opening is represented. If the main negative lens is too far away from the image plane, it will hinder the shortening of the total optical length. If the main negative lens is too close to the image plane, the negative lens is disposed at a position where the light beam is thin, which is disadvantageous for correction of spherical aberration and coma aberration. Furthermore, if the aperture diameter s1 of the first aperture of the first diaphragm member is too large, it is possible to block light rays that tend to cause coma that passes near the end of the entrance pupil from among the light beams that are imaged to the peripheral image height. This is disadvantageous for correction of coma aberration. On the other hand, if the opening diameter s1 of the first opening is too small, the increase in the diameter of the imaging lens is hindered.
That is, exceeding the lower limit of the conditional expression (1) prevents the main negative lens from being too close to the image plane or the opening diameter s1 of the first opening of the first blocking member from becoming too large. Aberration and coma can be corrected well. On the other hand, by falling below the upper limit of conditional expression (1), it is possible to prevent the main negative lens from moving too far away from the image plane and the aperture diameter s1 of the first aperture of the first aperture member from becoming too small. It is possible to increase the diameter while shortening the length.

Furthermore, by satisfying the conditional expression (2), the aperture diameter s2 of the second diaphragm member disposed on the object side or the image side of the main negative lens is set to open the first diaphragm member disposed on the object side of the first lens. The light beam that is smaller than the aperture s1 and that passes through the vicinity of the end of the entrance pupil among the light fluxes formed at the peripheral image height is shielded, so that coma can be improved and high performance can be achieved. Become.
Conditional expression (5) represents the ratio of the combined focal length f123 from the first to third lenses to the focal length f of the entire system. In order to shorten the overall optical length while maintaining the focal length f of the entire system, the principal point position of the entire system must be brought closer to the object side. However, by placing a strong positive power on the object side, The principal point position can be moved closer to the object side. By falling below the upper limit of conditional expression (5), the first to third lenses have a strong positive power, which is advantageous for shortening the total optical length. Moreover, since the positive power of the first to third lenses does not become too strong by exceeding the lower limit of the conditional expression (5), the occurrence of spherical aberration and coma aberration can be reduced.
The value of conditional expression (5) is more preferably in the range of the following expression.
1.53 ≦ f123 / f <2.5 (5) ′

According to a specific aspect of the present invention, in the imaging lens, the lens closest to the image side is a negative lens. That is, in the case of the first to seventh lenses in order from the object side, the seventh lens is a negative lens. In the case of the first to sixth lenses, the sixth lens is a negative lens.
By making the final lens a negative lens, the image plane is moved away from the final lens, so that necessary back focus can be ensured. For example, in an auto-focus type imaging device, a mechanism for changing the distance between the lens and the sensor is provided, so the distance between the lens and the sensor is required to be large to some extent, and as described above, the back focus is ensured. Becomes important.

  In another aspect of the present invention, an aperture stop is provided closer to the object side than the fourth lens. By arranging the aperture stop in this way, the exit pupil position can be moved away from the image plane, so that the incident angle of the light beam on the image plane can be kept small.

In still another aspect of the present invention, the following conditional expression is satisfied.
1.0 ≦ Φmax / EPD <1.25 (3)
Φmax: effective diameter of the lens having the largest effective diameter from the first lens to the third lens EPD: entrance pupil diameter For the value of the conditional expression (3), the range of the following expression is more preferable.
1.0 ≦ Φmax / EPD <1.1 (3) ′

  Conditional expression (3) represents the ratio of the largest effective diameter Φmax of the effective diameters of the first to third lenses to the entrance pupil diameter EPD. Since the three lenses arranged closest to the object side are arranged at a position where the beam diameter is large, the contribution to spherical aberration and coma aberration is large. When the effective diameter Φmax increases with respect to the entrance pupil, the luminous flux diameter becomes relatively small with respect to the effective diameter in the lens having the maximum effective diameter Φmax, and thus the contribution to spherical aberration and coma aberration is reduced. If it is a negative lens, the optimum aberration correction cannot be performed, and if it is a positive lens, the occurrence of aberration cannot be suppressed small. In other words, both the spherical aberration and the coma aberration can be satisfactorily corrected by falling below the upper limit of the conditional expression (3). Moreover, since the effective diameter of the first lens is never smaller than the entrance pupil, it does not fall below the lower limit of conditional expression (3).

In still another aspect of the present invention, the following conditional expression is satisfied.
0.70 <s2 / s1 ≦ 1.0 (4)
As for the value of conditional expression (4), the range of the following expression is more desirable.
0.73 <s2 / s1 ≦ 0.90 (4) ′

  Conditional expression (4) indicates that the second light-shielding diaphragm disposed on the image side or object side of the main negative lens with respect to the aperture diameter s1 of the first aperture of the first diaphragm member disposed on the object side of the first lens. The ratio of the opening diameter s2 of the two openings is represented. When the aperture diameters of all the diaphragm members arranged between the lenses are determined so that the light beam formed at the peripheral image height passes through the entire area of the entrance pupil, the coma aberration that occurs remarkably when the aperture is increased remains as it is. As a result, high performance becomes difficult. On the other hand, the light beam formed at the peripheral image height passes through the lens at a large angle with respect to the optical axis, particularly in a low-profile lens such as the imaging lens according to the present invention, so that it is near the end of the entrance pupil. The light rays passing through the optical axis move away from the optical axis as they approach the image plane. Therefore, the light beam that passes through the position of the main negative lens passes through the position away from the optical axis with respect to the light beam that passes through the position of the aperture member on the object side of the first lens. Under such circumstances, by falling below the upper limit of conditional expression (4), the aperture diameter s2 of the second aperture member is surely smaller than the aperture diameter s1 of the first aperture member, and the coma aberration is reliably improved. And higher performance is possible. Further, by exceeding the lower limit of the conditional expression (4), it is possible to prevent the light flux of the peripheral image height from being excessively shielded, so that it is possible to prevent the peripheral light amount from being insufficient.

In still another aspect of the present invention, the three lenses continuously arranged on the image side of the main negative lens satisfy the following conditional expressions, respectively.
0.01 <SAG_A / ΦA <0.20 (6)
SAG_A: Sag amount within the effective diameter of the object side surface ΦA: Effective diameter of the object side surface The value of conditional expression (6) is more preferably in the range of the following expression.
0.02 <SAG_A / ΦA <0.15 (6) ′

  Conditional expression (6) represents the ratio between the sag amount SAG_A and the effective diameter ΦA of the object side surfaces of the three lenses disposed on the image side of the main negative lens. If the sag amount SAG_A becomes too large with respect to the effective diameter ΦA, the area occupied in the optical axis direction of the lens becomes large, which is disadvantageous for shortening the optical total length. On the other hand, if the sag amount SAG_A is too small with respect to the effective diameter ΦA, the lens can only have a small refractive power, so that aberration correction becomes difficult.

  In yet another aspect of the present invention, the main negative lens is disposed on the image side immediately after the main positive lens. From the viewpoint of shortening the total optical length, it is desirable that the main positive lens is closer to the object side in order to bring the principal point position of the entire system closer to the object side. Further, since the light fluxes formed at the respective image heights are converged after passing through the main positive lens, the light flux becomes thinner as the distance from the main positive lens is increased. From the viewpoint of aberration correction, it is desirable that the main negative lens is disposed at a position where the light beam is thick. Therefore, by arranging the main negative lens immediately after the main positive lens on the image side, it is possible to improve the aberration correction while advantageously shortening the optical total length.

  In still another aspect of the present invention, the optical device further includes an optical element having substantially no power.

  An imaging apparatus according to the present invention includes the imaging lens described above and an imaging element. By using the imaging lens of the present invention, a small, bright and high-performance imaging device can be obtained.

  The portable terminal which concerns on this invention is provided with the above-mentioned imaging device. By using the imaging device of the present invention, a small and high performance portable terminal can be obtained.

It is a figure explaining an imaging device provided with the imaging lens of one embodiment of the present invention. It is a partial expanded sectional view explaining the state of a lens or a diaphragm member. It is a block diagram explaining a portable terminal provided with the imaging device of FIG. (A) And (B) is a perspective view of the surface side and back surface side of a portable terminal, respectively. 2 is a cross-sectional view of an imaging lens of Example 1. FIG. (A)-(E) are the aberrational figures of the imaging lens of Example 1. FIG. 6 is a cross-sectional view of an imaging lens of Example 2. FIG. (A)-(E) are the aberrational figures of the imaging lens of Example 2. FIG. 6 is a cross-sectional view of an imaging lens of Example 3. FIG. FIGS. 7A to 7E are aberration diagrams of the imaging lens of Example 3. FIGS. 6 is a cross-sectional view of an imaging lens of Example 4. FIG. (A)-(E) are the aberrational figures of the imaging lens of Example 4. FIGS. 6 is a cross-sectional view of an imaging lens of Example 5. FIG. FIGS. 7A to 7E are aberration diagrams of the imaging lens of Example 5. FIGS. 6 is a cross-sectional view of an imaging lens of Example 6. FIG. (A)-(E) are the aberrational figures of the imaging lens of Example 6. FIG. 10 is a cross-sectional view of an imaging lens of Example 7. FIG. FIGS. 7A to 7E are aberration diagrams of the imaging lens of Example 7. FIGS. 10 is a cross-sectional view of an imaging lens of Example 8. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 8. FIGS. 10 is a cross-sectional view of an imaging lens of Example 9. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 9. FIGS. 10 is a cross-sectional view of an imaging lens of Example 10. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 10. FIGS. 14 is a cross-sectional view of the imaging lens of Example 11. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 11. FIGS. 14 is a cross-sectional view of an imaging lens of Example 12. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 12. FIGS. 14 is a cross-sectional view of the imaging lens of Example 13. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 13. FIGS. 16 is a cross-sectional view of the imaging lens of Example 14. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 14. FIGS. 16 is a cross-sectional view of the imaging lens of Example 15. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 15. FIGS. 16 is a cross-sectional view of the imaging lens of Example 16. FIG. FIGS. 9A to 9E are aberration diagrams of the imaging lens of Example 16. FIGS.

  Hereinafter, with reference to FIG. 1 etc., the imaging lens etc. which are one Embodiment of this invention are demonstrated. The imaging lens 10 illustrated in FIG. 1 has the same configuration as the imaging lens 11 of Example 1 described later.

  FIG. 1 is a cross-sectional view illustrating a camera module including an imaging lens according to an embodiment of the present invention.

  The camera module 50 includes an imaging lens 10 that forms a subject image, an imaging device 51 that detects a subject image formed by the imaging lens 10, and a wiring board 52 that holds the imaging device 51 from behind and has wiring and the like. And a lens barrel portion 54 having an opening OP for holding the imaging lens 10 and the like and allowing a light beam from the object side to enter. The imaging lens 10 has a function of forming a subject image on the image plane or the imaging plane (projected plane) I of the imaging element 51. The camera module 50 is used by being incorporated in an imaging device to be described later.

  The imaging lens 10 includes, in order from the object side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. With. Between these first to seventh lenses L1 to L7, an aperture stop AS and a light-shielding stop FS are disposed at appropriate positions such as the object side of the first lens L1. Although illustration is omitted, the imaging lens 10 may include first to sixth lenses instead of the first to seventh lenses L1 to L7, or may include first to eighth lenses. . Specifically, for example, instead of the fourth, fifth, sixth, and seventh lenses L4, L5, L6, and L7, fourth, fifth, and sixth lenses may be provided.

The imaging lens 10 is small in size, and as a scale, it aims at miniaturization at a level satisfying the following expression (7).
L / 2Y <1.00 (7)
Here, L is the distance on the optical axis AX from the most object-side lens surface S11 of the entire imaging lens 10 system to the image-side focal point, and 2Y is the diagonal length of the imaging surface of the imaging device 51 (of the imaging device 51). Diagonal length of the rectangular effective pixel region), and the image-side focal point refers to an image point when a parallel ray parallel to the optical axis AX is incident on the imaging lens 10. By satisfying this range, the entire camera module 50 can be reduced in size.

A parallel flat plate F such as an optical low-pass filter, an infrared cut filter, or a seal glass of an image pickup device package is disposed between the most image side surface (image side surface S72) of the image pickup lens 10 and the image side focal position. In this case, the value of L is calculated for the parallel flat plate F portion as an air conversion distance. More preferably, it is in the range of the following formula.
L / 2Y <0.95 (7) '

  The image sensor 51 is a sensor chip made of a solid-state image sensor. The photoelectric conversion unit 51a of the image sensor 51 is composed of a CCD (charge coupled device) or a CMOS (complementary metal oxide semiconductor), photoelectrically converts incident light for each RGB, and outputs an analog signal thereof. The surface of the photoelectric conversion unit 51a as the light receiving unit is an image plane or an imaging plane (projected plane) I.

  The wiring board 52 has a role of aligning and fixing the image sensor 51 to other members (for example, the lens barrel portion 54). The wiring board 52 can receive a voltage and a signal for driving the image pickup device 51 and the driving mechanism 55a from an external circuit, and can output a detection signal to the external circuit.

  On the imaging lens 10 side of the imaging element 51, a parallel plate F is disposed and fixed by a holder member (not shown) so as to cover the imaging element 51 and the like.

  The lens barrel 54 houses and holds the imaging lens 10. The lens barrel portion 54 enables the focusing operation of the imaging lens 10 by moving any one or more of the lenses L1 to L7 constituting the imaging lens 10 along the optical axis AX. For example, it has a drive mechanism 55a. The drive mechanism 55a includes, for example, a voice coil motor and a guide, and reciprocates a specific lens or all of the lenses along the optical axis AX.

  Although illustration is abbreviate | omitted, the 1st-7th lenses L1-L7 which comprise the imaging lens 10 have the comparatively thick flange part for a support on the outer periphery periphery, respectively, via a flange part. It is laminated with an adjacent lens and held in the lens barrel portion 54a.

  With reference to FIG. 2 etc., the state of the imaging lens 10 hold | maintained in the lens-barrel part 54 is demonstrated. The first to seventh lenses L1 to L7 constituting the imaging lens 10 each have a supporting flange portion 39, and are stacked with adjacent lenses via the flange portion 39, and are held in the lens barrel portion 54a. Has been. Between these lenses L1 to L7, one aperture stop AS and five light-shielding stops FS are disposed between the flange portions 39 to prevent the generation of stray light. An aperture stop FS that covers the periphery of the effective diameter of the lens L1 is formed on the object side of the lens barrel portion 54a. A light-shielding stop FS is also disposed on the image side of the flange portion 39 of the seventh lens L7. The aperture stop AS and the light-shielding stop FS described above are stop members for selectively allowing light rays that can contribute to image formation to pass through.

  Next, an example of a cellular phone or other portable terminal 300 equipped with the camera module 50 illustrated in FIG. 1 will be described with reference to FIGS. 3, 4A, and 4B.

  The mobile terminal 300 is a smartphone-type mobile communication terminal, and includes an imaging device 100 having a camera module 50, a control unit (CPU) 310 that performs overall control of each unit and executes a program corresponding to each process, and communication. Various operations between a display operation unit 320 that is a touch panel that displays data related to the image, captured video, and the like and receives a user operation, an operation unit 330 including a power switch, and an external server via the antenna 341 Executed by a wireless communication unit 340 for realizing information communication, a storage unit (ROM) 360 storing necessary data such as a system program, various processing programs, and a terminal ID of the mobile terminal 300, and the control unit 310 Various processing programs and data, processing data, or imaging data by the imaging device 100 Temporary storage unit used as a work area for temporarily storing data or the like and a (RAM) 370.

  In addition to the camera module 50 described above, the imaging apparatus 100 includes a control unit 103, an optical system driving unit 105, an imaging element driving unit 107, an image memory 108, and the like.

  The control unit 103 controls each unit of the imaging device 100. The control unit 103 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and various types of programs are read out from the ROM and expanded in the RAM, in cooperation with the CPU. Execute the process. The control unit 103 is communicably connected to the control unit 310 outside the imaging apparatus 100, and can exchange control signals and image data.

  The optical system driving unit 105 controls the state of the imaging lens 10 by operating the driving mechanism 55 a of the imaging lens 10 when performing focusing, exposure, and the like under the control of the control unit 103. The optical system driving unit 105 operates the driving mechanism 55a to appropriately move the specific lens or all the lenses in the imaging lens 10 along the optical axis AX, thereby causing the imaging lens 10 to perform a focusing operation or the like.

  The image sensor drive unit 107 controls the operation of the image sensor 51 when performing exposure or the like under the control of the control unit 103. Specifically, the image sensor driving unit 107 scans and drives the image sensor 51 based on the timing signal, and extracts an image signal therefrom. The image sensor driving unit 107 can perform various image processing such as distortion correction, color correction, and compression on the image signal detected and digitized by the image sensor 51.

  The image memory 108 receives the digitized image signal from the image sensor driving unit 107 and stores it as readable and writable image data.

  Here, the photographing operation of the mobile terminal 300 including the imaging device 100 will be described. When the camera mode in which the mobile terminal 300 is operated as a camera is set, subject monitoring (through image display) and image shooting execution are performed. In monitoring, an image of a subject obtained through the imaging lens 10 is formed on the imaging surface I (see FIG. 1) of the imaging element 51. The image sensor 51 is scanned and driven by the image sensor driving unit 107 and detects an analog signal corresponding to one screen as a photoelectric conversion output corresponding to a light image formed at regular intervals.

  This analog signal is converted into digital data after gain adjustment is appropriately performed for each primary color component of RGB in a circuit attached to the image sensor 51. The digital data is subjected to color process processing including pixel interpolation processing and Y correction processing in the image sensor driving unit 107 to generate a digital luminance signal Y and color difference signals Cb, Cr (image data). And stored in the image memory 108. The stored digital data is periodically read out from the image memory 108 and used to generate a video signal, and is output to the display operation unit 320 via the control unit 103 and the control unit 310.

  The display operation unit 320 functions as a finder in monitoring and displays captured images in real time. In this state, focusing, exposure, and the like of the imaging lens 10 are set by driving the optical system driving unit 105 based on an operation input performed by the user via the display operation unit 320 at any time.

  In such a monitoring state, when the user appropriately operates the display operation unit 320, still image data is captured. One frame of image data stored in the image memory 108 is read in accordance with the operation content of the display operation unit 320, and processing such as compression is performed by the image sensor driving unit 107. The processed image data is recorded in, for example, a temporary storage unit (RAM) 370 via the control unit 103 and the control unit 310.

  The above-described imaging apparatus 100 is an example of an imaging apparatus suitable for the present invention, and the present invention is not limited to this.

  That is, the imaging device equipped with the camera module 50 or the imaging lens 10 is not limited to being built in the smartphone-type mobile terminal 300, but may be built into a mobile phone, a PHS (Personal Handyphone System), or the like. Of course, it may be incorporated in a PDA (Personal Digital Assistant), a tablet personal computer, a mobile personal computer, a digital still camera, a video camera, or the like.

  Hereinafter, returning to FIG. 1 and the like, the imaging lens 10 according to an embodiment of the present invention will be described in detail. An imaging lens 10 shown in FIG. 1 forms a subject image on an imaging surface (projected surface) I of an imaging device 51, and is a positive first lens with a convex surface facing the object side in order from the object side. L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and a negative seventh lens with a concave surface facing the image side in the vicinity of the optical axis AX L7. In the imaging lens 10, the object side surface S71 and the image side surface S72 of the seventh lens L7 closest to the image side are aspherical surfaces. In particular, the image side surface S72 has an extreme value, that is, an inflection point P within the effective diameter. Of the first to third lenses L1 to L3, the first lens L1 is a positive lens having a positive refractive power in the vicinity of the optical axis AX, and the second and third lenses L2 and L3 are both optical axes, for example. It is a negative lens having negative refractive power in the vicinity of AX. In the illustrated example, the first to third lenses L1 to L3 are one positive lens, and the first lens L1 is a main positive lens. In the illustrated example, the focal length (absolute value) of the second lens L2 is shorter than the focal length (absolute value) of the third lens L3, and the second lens L2 is a main negative lens. The combined focal length of the first and second lenses L1 and L2 is a positive value. The imaging lens 10 has an aperture stop AS closer to the object side than the third lens L3, and in the illustrated example, the aperture stop AS is disposed between the first and second lenses L1 and L2. In the imaging lens 10, a light-shielding stop FS is disposed between the object side of the first lens L1 and between the second and third lenses L2 and L3. Here, the light-shielding diaphragm FS1 disposed on the object side of the first lens L1 functions as a first diaphragm member having a first opening, and is disposed between the first and second lenses L1 and L2. The light-shielding stop FS2 disposed between the aperture stop AS or the second and third lenses L2 and L3 functions as a second stop member having a second opening.

  According to the imaging lens 10, the first lens L1 among the first to third lenses L1 to L3 close to the object side is a positive lens, and the combined focal length of the first and second lenses L1 and L2 is positive. Therefore, the principal point position of the entire imaging lens 10 system is closer to the object side, which is advantageous for shortening the optical total length. In addition, since the second lens L2 and the like among the first to third lenses L1 to L3 is a negative lens, the negative lens can be disposed at a position where the axial light beam diameter is large. It becomes advantageous for correction of. Furthermore, by making the image side surface S72 of the final seventh lens L7 an aspherical surface having an inflection point P within the effective diameter, the incident angle when a light beam having a peripheral image height is incident on the imaging surface I is kept small. Therefore, the light receiving efficiency of the image sensor 51 can be improved.

In the imaging lens 10, the value Dn is the distance from the image side surface S22 of the main negative lens (second lens L2) to the imaging surface I, and the value s1 is the opening of the first aperture provided in the light-shielding stop FS on the object side. The following conditional expressions (1) and (2) are used, where the aperture is the aperture, and the value s2 is the aperture of the second aperture provided in the image-side light-shielding stop FS.
1.5 <Dn / s1 <2.3 (1)
s1 ≧ s2 (2)
Is satisfied. Here, about the value Dn, the part of the parallel plate F is calculated as an air conversion length. The value s1 is given as the aperture diameter of the first diaphragm member (light-shielding diaphragm) FS1 disposed on the object side of the first lens L1. The value s2 is given as the aperture diameter of the second diaphragm member (light-shielding diaphragm) FS2 disposed between the second and third lenses L2 and L3. In the illustrated example, the aperture diameter of the light-shielding stop FS on the image side of the second lens L2 is smaller than the aperture diameter of the aperture stop AS on the object side of the second lens L2 that is the main negative lens. , A light-shielding stop FS between the second and third lenses L2 and L3.
Note that the value Dn / s1 of the conditional expression (1) is more preferably within the range of the following conditional expression (1) ′.
1.6 <Dn / s1 <2.2 (1) ′

According to the imaging lens 10, the value Dn / s1 exceeds the lower limit of the conditional expression (1), so that the main negative lens (second lens L2) is too close to the imaging surface I or provided on the diaphragm member FS. Since it is possible to prevent the opening diameter s1 of the first opening from becoming too large, it is possible to satisfactorily correct spherical aberration and coma aberration. On the other hand, when the value Dn / s1 falls below the upper limit of the conditional expression (1), the main negative lens (second lens L2) is too far away from the image plane, or the aperture diameter s1 of the first aperture provided in the aperture member FS. Can be prevented from becoming too small, so that it is possible to increase the aperture while shortening the optical total length of the imaging lens 10.
Also, according to the imaging lens 10, the conditional expression (2) is satisfied, the opening diameter s1 of the first diaphragm member FS1 is smaller than the opening diameter s2 of the second diaphragm member FS2, and an image is formed at the peripheral image height. Since the light beam passing through the vicinity of the end of the entrance pupil of the light beam is shielded, coma aberration can be improved and high performance can be achieved.

In addition to the conditional expressions (1) and (2), the imaging lens 10 of the present embodiment has the conditional expression (3) already described.
1.0 ≦ Φmax / EPD <1.25 (3)
Satisfied. However, the value Φmax is the effective diameter of the lens having the largest effective diameter (the first lens L1 in the illustrated example) among the first to third lenses L1 to L3, and the value EPD is the entrance pupil diameter. .
The value Φmax / EPD of conditional expression (3) is more preferably within the range of conditional expression (3) ′ below.
1.0 ≦ Φmax / EPD <1.1 (3) ′

In addition to the conditional expression (1) and the like, the imaging lens 10 of the present embodiment has the conditional expression (4) already described.
0.70 <s2 / s1 ≦ 1.0 (4)
Satisfied.
Note that the value s2 / s1 of the conditional expression (4) is more preferably within the range of the following conditional expression (4) ′.
0.73 <s2 / s1 ≦ 0.90 (4) ′

In addition to the conditional expression (1) and the like, the imaging lens 10 of the present embodiment has the conditional expression (5) already described.
1. 53 ≦ f123 / f <4.0 (5)
Satisfied. However, the value f123 is the combined focal length from the first to third lenses L1 to L3, and the value f is the focal length of the entire imaging lens 10 system.
The value f123 / f of the conditional expression (5) is more preferably within the range of the following conditional expression (5) ′.
1. 53 ≦ f123 / f <2.5 (5) ′

Of the imaging lens 10 of the present embodiment, the three lenses (third, fourth, fifth lenses L3, L4, L5) arranged on the image side of the main negative lens (second lens L2) are described above. In addition to conditional expression (1) etc., conditional expression (6) already explained
0.01 <SAG_A / ΦA <0.20 (6)
Satisfied. However, the value SAG_A is the sag amount within the effective diameter of the object side surfaces S31, S41, S51 of the three lenses L3 to L5, and ΦA is the effective value of the object side surfaces S31, S41, S51 of the lenses L3 to L5. Is the diameter.
Note that the value SAG_A / ΦA of the conditional expression (6) is more preferably within the range of the following conditional expression (6) ′.
0.02 <SAG_A / ΦA <0.15 (6) ′

  Although not particularly illustrated, the imaging lens 10 of the present embodiment may further include a lens or other optical element that does not substantially have power.

ただし、
Ａｉ：ｉ次の非球面係数
Ｒ：曲率半径
Ｋ：円錐定数
さらに、各実施例において、「ＳＴＯ」は開口絞りＡＳを意味し、「ＦＳ」は遮光絞りＦＳを意味する。
なお、各実施例の撮像レンズが前提とする使用基本波長は５８７．５６ｎｍであり、曲率半径等の面形状の単位はｍｍである。 〔Example〕
Hereinafter, specific examples of the imaging lens according to the present invention will be described. In each embodiment, r represents the radius of curvature, d represents the axial top surface spacing, nd represents the refractive index of the lens material with respect to the d-line, vd represents the Abbe number of the lens material, “eff. “dia.” means an effective diameter. In addition, the surface described with “*” after each surface number is a surface having an aspheric shape, and the shape of the aspheric surface has the vertex of the surface as the origin, the X axis in the optical axis AX direction, The height in the direction perpendicular to the axis AX is represented by “Equation 1” below.

However,
Ai: i-order aspherical coefficient R: radius of curvature K: conical constant Further, in each embodiment, “STO” means the aperture stop AS, and “FS” means the light blocking stop FS.
In addition, the use fundamental wavelength which the imaging lens of each Example presupposes is 587.56 nm, and the unit of surface shape, such as a curvature radius, is mm.

[Example 1]
The lens surface data of Example 1 is shown in Table 1 below.
[Table 1]
Surface number rd nd vd eff.dia.
1 FS INFINITY -0.1000 2.700
2 * 1.9667 0.7120 1.54470 56 2.625
3 * -9.5028 0.0663 2.494
STO INFINITY 0.0000 2.443
5 * 2.1268 0.1504 1.63469 23.9 2.282
6 * 1.1775 0.3670 2.056
7 FS INFINITY 0.1800 2.050
8 * 22.5212 0.3660 1.54470 56 2.182
9 * 8.2854 0.1000 2.451
10 * 2.6266 0.3717 1.54470 56 2.778
11 * 4.7470 0.1535 3.036
12 * 8.6726 0.2000 1.63469 23.9 3.277
13 * 5.3552 0.2870 3.431
14 * 8.4713 0.6176 1.54470 56 3.820
15 * -1.2722 0.2844 4.092
16 * 45.1563 0.3151 1.54470 56 4.908
17 * 1.0531 0.4000 5.309
18 INFINITY 0.1100 1.51633 64.1 5.602
19 INFINITY 0.3790

The aspheric coefficients of the lens surfaces of Example 1 are shown in Table 2 below.
[Table 2]
Second side
K = -8.22802e-001, A4 = 1.91375e-002, A6 = 5.43170e-003,
A8 = -5.90436e-003, A10 = 8.76981e-003, A12 = -4.67995e-003,
A14 = 1.07996e-003
Third side
K = -7.98909e + 001, A4 = 9.81762e-002, A6 = -1.18737e-001,
A8 = 1.18025e-001, A10 = -7.92024e-002, A12 = 3.03109e-002,
A14 = -4.86274e-003
5th page
K = -2.24162e + 001, A4 = 1.80214e-002, A6 = -4.06404e-002,
A8 = 5.39192e-002, A10 = -5.00906e-002, A12 = 2.27445e-002,
A14 = -3.54001e-003
6th page
K = -6.33786e + 000, A3 = 1.03847e-002, A4 = 1.36593e-002,
A5 = 1.94056e-002, A6 = 4.64130e-002, A8 = -1.32939e-001,
A10 = 1.71554e-001, A12 = -1.14880e-001, A14 = 3.23310e-002
8th page
K = -2.79837e + 001, A3 = -1.02503e-002, A4 = 1.95438e-002,
A5 = -1.94346e-001, A6 = 2.30842e-001, A8 = -2.05062e-001,
A10 = 1.34975e-001, A12 = -5.11263e-002, A14 = -3.10333e-004
9th page
K = 4.97825e + 000, A3 = -4.48486e-002, A4 = -1.72924e-001,
A5 = 4.01329e-003, A6 = 6.30455e-002, A8 = -4.19386e-002,
A10 = 6.44463e-003, A12 = 6.17139e-003, A14 = -4.50847e-003
10th page
K = 4.89398e-001, A3 = -7.49603e-002, A4 = -1.53262e-001,
A5 = 9.45476e-003, A6 = -1.14499e-002, A8 = 5.41254e-003,
A10 = 7.60970e-003, A12 = 1.34869e-003, A14 = -1.55023e-003
11th page
K = 6.32329e + 000, A3 = -8.08059e-002, A4 = -5.21718e-002,
A5 = 5.05387e-002, A6 = -1.28865e-001, A8 = 5.81021e-002,
A10 = -1.28264e-002, A12 = 1.49895e-003
12th page
K = 1.86989e + 001, A3 = -4.91918e-002, A4 = -3.35069e-001,
A5 = 3.65152e-001, A6 = -2.67571e-001, A8 = 1.01794e-001,
A10 = -1.92471e-002, A12 = 8.87502e-004
Side 13
K = -3.08174e + 000, A3 = -3.23757e-002, A4 = -2.63810e-001,
A5 = 1.59983e-001, A6 = -4.87836e-002, A8 = 6.04489e-003,
A10 = 6.42809e-003, A12 = -2.20734e-003, A14 = 1.58325e-004
14th page
K = -3.38748e + 001, A3 = -3.88196e-003, A4 = 1.24503e-002,
A5 = -1.20172e-001, A6 = 1.17358e-001, A8 = -4.78783e-002,
A10 = 1.49422e-002, A12 = -2.67805e-003, A14 = 2.20101e-004
15th page
K = -9.07157e + 000, A3 = -9.46510e-002, A4 = -5.97512e-002,
A5 = 1.02415e-001, A6 = -6.69828e-003, A8 = -1.78173e-002,
A10 = 6.50738e-003, A12 = -1.12326e-003, A14 = 7.68896e-005
16th page
K = 7.99641e + 001, A3 = -1.20236e-001, A4 = -9.23792e-002,
A5 = 3.91343e-002, A6 = 2.25840e-002, A8 = -2.96911e-003,
A10 = -3.44293e-004, A12 = 8.49048e-005, A14 = -4.43939e-006
17th page
K = -6.37169e + 000, A3 = -1.87779e-003, A4 = -1.49423e-001,
A5 = 1.11589e-001, A6 = -2.92809e-002, A8 = 1.35999e-003,
A10 = -2.30915e-004, A12 = 2.63067e-005, A14 = -8.30657e-007
In the following (including the lens data in the table), a power of 10 (for example, 2.5 × 10 ⁻⁰⁰² ) is expressed using e (for example, 2.5e−002).

The characteristics of the imaging lens of Example 1 are listed below.
FL 3.778
Fno 1.44
w 75.33
Ymax 2.916
BF 0.889
TL 5.060
BFa 0.852
TLa 5.023
Here, FL means the focal length of the entire imaging lens system, Fno means the F number, w means the diagonal field angle, Ymax means the half value of the diagonal length of the imaging surface of the imaging device, and BF means This means back focus, and TL means the total length of the system. BFa is the back focus (final lens to image plane I * when the parallel plate is the air conversion length), and TLa is the optical total length (final lens to image plane I * the parallel plate is the air conversion length). means. In addition, the above code | symbol shall have the same meaning also in the subsequent Examples.

The single lens data of Example 1 is shown in Table 3 below.
[Table 3]
Lens number Surface number Focal length Effective diameter
Elem Surfs Focal Length Diameter
1 2- 3 3.0584 2.625
2 5- 6 -4.4284 2.282
3 8- 9 -24.2842 2.451
4 10-11 10.1673 3.036
5 12-13 -22.5866 3.431
6 14-15 2.0771 4.092
7 16-17 -1.9845 5.309
8 18-19 -1e + 035 5.638

  FIG. 5 is a cross-sectional view of the imaging lens 11 and the like of the first embodiment. The imaging lens 11 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a meniscus having a negative refractive power around the optical axis AX and a convex surface facing the object side. The second lens L2, the third lens L3 having a substantially negative refractive power around the optical axis AX and having a concave surface facing the image side, and an object having a positive refractive power around the optical axis AX. A fourth meniscus lens L4 having a convex surface facing the side, a fifth meniscus lens L5 having a weak negative refractive power around the optical axis AX and a convex surface facing the object side, and a positive refraction around the optical axis AX A biconvex sixth lens L6 having power, and a substantially plano-concave seventh lens L7 having negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the first and second lenses L1 and L2, and between the object side of the outer edge of the first lens L1 and between the second and third lenses L2 and L3, A light-shielding stop FS is disposed. For example, a parallel plate (not shown) having an appropriate thickness can be disposed between the light incident surface of the first lens L1 and the object, and this is the same in the following embodiments.

  6A to 6C show various aberration diagrams (spherical aberration, astigmatism, distortion aberration) of the imaging lens 11 of Example 1, and FIGS. 6D and 6E show the examples. The lateral aberration of the imaging lens 11 of Example 1 is shown.

[Example 2]
The lens surface data of Example 2 is shown in Table 4 below.
[Table 4]
Surface number rd nd vd eff.dia.
1 FS INFINITY -0.2500 2.700
2 * 1.8265 0.7706 1.54470 56 2.633
3 * -9.8075 0.0500 2.483
4 * 2.2119 0.1796 1.63469 23.9 2.261
5 * 1.1650 0.3677 1.978
STO INFINITY 0.1500 1.963
7 * -15.7609 0.1900 1.54470 56 2.113
8 * 12.4701 0.1015 2.279
9 * 3.4709 0.6368 1.54470 56 2.595
10 * 13.7284 0.1000 2.996
11 * 6.9010 0.2000 1.63469 23.9 3.132
12 * 6.4920 0.5187 3.256
13 * 44.5000 0.4973 1.54470 56 3.591
14 * -1.1492 0.1749 3.914
15 * -5.2967 0.3007 1.54470 56 4.536
16 * 1.1765 0.7000 5.011
17 INFINITY 0.1100 1.51633 64.1 5.680
18 INFINITY 0.2024

The aspherical coefficient of the lens surface of Example 2 is shown in Table 5 below.
[Table 5]
Second side
K = -7.62402e-001, A4 = 2.04751e-002, A6 = 6.15415e-003,
A8 = -6.48276e-003, A10 = 8.84911e-003, A12 = -4.48738e-003,
A14 = 1.01834e-003
Third side
K = 9.83262e + 000, A4 = 9.78535e-002, A6 = -1.16417e-001,
A8 = 1.18654e-001, A10 = -7.95199e-002, A12 = 3.02924e-002,
A14 = -4.86274e-003
4th page
K = -1.88230e + 001, A4 = -8.39250e-004, A6 = -3.81024e-002,
A8 = 6.15429e-002, A10 = -4.95206e-002, A12 = 2.10021e-002,
A14 = -3.54000e-003
5th page
K = -5.13366e + 000, A3 = 9.20875e-003, A4 = 1.19772e-002,
A5 = 1.92273e-002, A6 = 5.03902e-002, A8 = -1.21332e-001,
A10 = 1.72304e-001, A12 = -1.22781e-001, A14 = 3.79822e-002
7th page
K = -8.00000e + 001, A3 = -1.31138e-002, A4 = 4.62154e-002,
A5 = -1.85231e-001, A6 = 2.34638e-001, A8 = -1.98611e-001,
A10 = 1.35696e-001, A12 = -5.04387e-002, A14 = 7.62898e-003
8th page
K = 4.88218e + 001, A3 = -1.80239e-002, A4 = -1.52562e-001,
A5 = 1.13531e-002, A6 = 6.54020e-002, A8 = -3.87499e-002,
A10 = 1.08407e-002, A12 = 9.52540e-003, A14 = -3.15667e-003
9th page
K = 2.06211e + 000, A3 = -1.95698e-002, A4 = -1.42525e-001,
A5 = 1.93943e-002, A6 = -8.24714e-003, A8 = 3.05060e-003,
A10 = 7.47791e-003, A12 = 1.72573e-003, A14 = -1.21519e-003
10th page
K = -8.00000e + 001, A3 = -2.74626e-002, A4 = -2.19898e-002,
A5 = 6.27652e-002, A6 = -1.24758e-001, A8 = 5.60335e-002,
A10 = -1.42980e-002, A12 = 2.03003e-003
11th page
K = 1.39238e + 001, A3 = -8.44025e-003, A4 = -3.28119e-001,
A5 = 3.72168e-001, A6 = -2.65022e-001, A8 = 9.88716e-002,
A10 = -2.05718e-002, A12 = 1.06740e-003
12th page
K = 1.34574e + 001, A3 = -1.32284e-002, A4 = -2.56059e-001,
A5 = 1.57577e-001, A6 = -5.11886e-002, A8 = 7.16231e-003,
A10 = 6.80037e-003, A12 = -2.26892e-003, A14 = 4.15564e-005
Side 13
K = 8.00000e + 001, A3 = -9.74745e-003, A4 = 1.71772e-002,
A5 = -1.27294e-001, A6 = 1.14521e-001, A8 = -4.81556e-002,
A10 = 1.49933e-002, A12 = -2.62088e-003, A14 = 2.30959e-004
14th page
K = -7.64107e + 000, A3 = -4.42792e-002, A4 = -7.79999e-002,
A5 = 9.16848e-002, A6 = -8.06985e-003, A8 = -1.69608e-002,
A10 = 6.70296e-003, A12 = -1.10843e-003, A14 = 6.64654e-005
15th page
K = -6.14130e + 001, A3 = -6.87097e-002, A4 = -9.91812e-002,
A5 = 3.63023e-002, A6 = 2.20450e-002, A8 = -2.94886e-003,
A10 = -3.32315e-004, A12 = 8.65810e-005, A14 = -4.83883e-006
16th page
K = -9.29155e + 000, A3 = -1.25830e-002, A4 = -1.28523e-001,
A5 = 1.02833e-001, A6 = -3.15161e-002, A8 = 1.69075e-003,
A10 = -1.99522e-004, A12 = 2.45502e-005, A14 = -1.11388e-006

The characteristics of the imaging lens of Example 2 are listed below.
FL 4.313
Fno 1.64
w 67.60
Ymax 2.921
BF 1.012
TL 5.250
BFa 0.975
TLa 5.213

The single lens data of Example 2 is shown in Table 6 below.
[Table 6]
Elem Surfs Focal Length Diameter
1 2- 3 2.8944 2.633
2 4- 5 -4.1550 2.261
3 7- 8 -12.7508 2.279
4 9-10 8.3456 2.996
5 11-12 -213.0273 3.256
6 13-14 2.0645 3.914
7 15-16 -1.7389 5.011

  FIG. 7 is a cross-sectional view of the imaging lens 12 and the like of the second embodiment. The imaging lens 12 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a meniscus having a negative refractive power around the optical axis AX and a convex surface facing the object side. The second lens L2, the third biconcave lens L3 having negative refractive power around the optical axis AX, and the fourth meniscus having positive refractive power around the optical axis AX and having a convex surface facing the object side. Lens L4, a fifth meniscus lens L5 having a weak negative refractive power around the optical axis AX and having a convex surface facing the object side, and a positive refractive power around the optical axis AX and having a convex surface facing the image side A substantially planoconvex sixth lens L6 and a biconcave seventh lens L7 having negative refractive power around the optical axis AX. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2 and L3, and a light-shielding stop FS is disposed on the object side of the outer edge of the first lens L1. For example, a parallel plate (not shown) having an appropriate thickness can be disposed between the light incident surface of the first lens L1 and the object.

  8A to 8C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 12 of Example 2, and FIGS. 4 shows lateral aberration of the imaging lens 12 of Example 2.

Example 3
The lens surface data of Example 3 is shown in Table 7 below.
[Table 7]
Surface number rd nd vd eff.dia.
STO INFINITY -0.2500 2.625
2 * 2.0635 0.7031 1.54470 56 2.625
3 * -8.2734 0.0500 2.493
4 * 2.2022 0.1957 1.63469 23.9 2.290
5 * 1.1925 0.4520 2.045
6 FS INFINITY 0.1000 2.040
7 * 47.5805 0.3000 1.54470 56 2.074
8 * 25.0398 0.0884 2.326
9 * 4.6503 0.9065 1.54470 56 2.828
10 * 52.3411 0.1642 3.208
11 * -1.7499 0.2004 1.63469 23.9 3.326
12 * -1.4313 0.0500 3.557
13 * 13.9998 0.4818 1.54470 56 3.698
14 * -20.0000 0.3261 4.129
15 * 1.2751 0.3604 1.54470 56 4.867
16 * 0.7678 0.6000 5.318
17 INFINITY 0.1100 1.51633 64.1 5.700
18 INFINITY 0.1419

The aspherical coefficients of the lens surfaces of Example 3 are shown in Table 8 below.
[Table 8]
Second side
K = -1.42862e + 000, A4 = 2.77675e-002, A6 = 5.43424e-003,
A8 = -6.07353e-003, A10 = 8.35891e-003, A12 = -4.15242e-003,
A14 = 9.53612e-004
Third side
K = -8.00000e + 001, A4 = 9.76993e-002, A6 = -1.24374e-001,
A8 = 1.24899e-001, A10 = -8.16539e-002, A12 = 3.04828e-002,
A14 = -4.86208e-003
4th page
K = -1.93605e + 001, A4 = 4.29146e-002, A6 = -9.25227e-002,
A8 = 9.66026e-002, A10 = -6.67212e-002, A12 = 2.46267e-002,
A14 = -3.54009e-003
5th page
K = -3.93582e + 000, A3 = -1.12833e-002, A4 = -3.64851e-002,
A5 = 3.27652e-002, A6 = 9.76461e-002, A8 = -1.58322e-001,
A10 = 1.37490e-001, A12 = -6.70341e-002, A14 = 1.50187e-002
7th page
K = 8.00000e + 001, A3 = -5.10427e-002, A4 = 1.39741e-001,
A5 = -3.81210e-001, A6 = 3.26202e-001, A8 = -1.70718e-001,
A10 = 7.85483e-002, A12 = -2.37923e-002, A14 = 1.81202e-003
8th page
K = 0.00000e + 000, A4 = -2.73521e-001, A6 = 1.78928e-001,
A8 = -8.65778e-002, A10 = 2.22277e-002, A12 = -1.85128e-003
9th page
K = 0.00000e + 000, A4 = -2.58118e-001, A6 = 1.43757e-001,
A8 = -2.48977e-002, A10 = -9.02995e-004, A12 = 6.19376e-004
10th page
K = 8.00000e + 001, A3 = -1.62229e-002, A4 = -1.27850e-001,
A5 = 6.36093e-002, A6 = -8.40529e-002, A8 = 6.12670e-002,
A10 = -2.25320e-002, A12 = 3.51866e-003
11th page
K = -2.65028e-001, A3 = 1.68317e-001, A4 = -2.36497e-001,
A5 = 3.68567e-001, A6 = -2.97211e-001, A8 = 9.30939e-002,
A10 = -1.81863e-002, A12 = 1.36314e-003
12th page
K = -5.58624e-001, A3 = 5.09014e-001, A4 = -4.45879e-001,
A5 = 1.53316e-001, A6 = -2.61242e-002, A8 = 5.47005e-003,
A10 = 4.88155e-003, A12 = -1.93135e-003, A14 = 1.64661e-004
Side 13
K = 5.39428e + 001, A3 = 3.27596e-001, A4 = -2.71244e-001,
A5 = -2.35007e-002, A6 = 1.23190e-001, A8 = -5.87165e-002,
A10 = 1.46150e-002, A12 = -1.99635e-003, A14 = 9.95736e-005
14th page
K = -8.00000e + 001, A3 = -4.14744e-001, A4 = 5.25797e-001,
A5 = -1.30899e-001, A6 = -1.89797e-002, A8 = -1.34729e-002,
A10 = 5.95330e-003, A12 = -8.74575e-004, A14 = 5.16865e-005
15th page
K = -1.43986e + 001, A3 = -3.35318e-001, A4 = 9.71430e-003,
A5 = 4.59226e-002, A6 = 1.67337e-002, A8 = -3.65987e-003,
A10 = -2.80541e-004, A12 = 9.56718e-005, A14 = -5.70973e-006
16th page
K = -6.17418e + 000, A3 = -1.20474e-002, A4 = -1.86539e-001,
A5 = 1.61058e-001, A6 = -4.60649e-002, A8 = 1.54960e-003,
A10 = -1.18236e-004, A12 = 2.46917e-005, A14 = -1.62982e-006

The characteristics of the imaging lens of Example 3 are listed below.
FL 3.791
Fno 1.44
w 75.43
Ymax 2.921
BF 0.852
TL 5.231
BFa 0.814
TLa 5.193

The single lens data of Example 3 is shown in Table 9 below.
[Table 9]
Elem Surfs Focal Length Diameter
1 2- 3 3.1066 2.625
2 4- 5 -4.4312 2.290
3 7-8 -97.4945 2.326
4 9-10 9.3074 3.208
5 11-12 9.9549 3.557
6 13-14 15.1947 4.129
7 15-16 -4.7278 5.318

  FIG. 9 is a cross-sectional view of the imaging lens 13 and the like of the third embodiment. The imaging lens 13 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a meniscus having a negative refractive power around the optical axis AX and a convex surface facing the object side. The second lens L2, the substantially flat third lens L3 having a weak negative refractive power around the optical axis AX, and a substantially convex flat surface having a positive refractive power around the optical axis AX and having a convex surface facing the object side. The fourth lens L4, a meniscus fifth lens L5 having a positive refractive power around the optical axis AX and having a convex surface facing the image side, and a convex surface having a positive refractive power around the optical axis AX and the image side And a sixth lens L7 of meniscus having a negative refractive power around the optical axis AX and a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed on the object side of the outer edge of the first lens L1, and a light-shielding stop FS is disposed between the second and third lenses L2 and L3. For example, a parallel plate (not shown) having an appropriate thickness can be disposed between the light incident surface of the first lens L1 and the object.

  FIGS. 10A to 10C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 13 of Example 3, and FIGS. 10D and 10E show the examples. The lateral aberration of the imaging lens 13 of Example 3 is shown.

Example 4
The lens surface data of Example 4 is shown in Table 10 below.
[Table 10]
Surface number rd nd vd eff.dia.
1 FS INFINITY -0.1500 2.700
2 * 2.5717 0.6047 1.54470 56 2.610
3 * -7.0453 0.1420 2.497
STO INFINITY 0.0000 2.393
5 * 1.8236 0.1687 1.63469 23.9 2.264
6 * 1.1019 0.4572 2.108
7 FS INFINITY 0.1000 2.080
8 * 37.1918 0.3890 1.54470 56 2.135
9 * -21.8268 0.1039 2.412
10 * 8.3148 0.5705 1.54470 56 2.767
11 * 8.1875 0.1528 3.061
12 * 2.6709 0.2002 1.63469 23.9 3.376
13 * 4.4625 0.3514 3.442
14 * -18.8765 0.6658 1.54470 56 3.617
15 * -1.0741 0.2265 3.959
16 * -34.1129 0.3255 1.54470 56 4.849
17 * 0.9139 0.4000 5.376
18 INFINITY 0.1100 1.51633 64.1 6.000
19 INFINITY 0.4068

The aspherical coefficients of the lens surfaces of Example 4 are shown in Table 11 below.
[Table 11]
Second side
K = -4.83126e + 000, A4 = 4.41063e-002, A6 = -6.70306e-003,
A8 = 9.50319e-005, A10 = 5.51386e-003, A12 = -3.75901e-003,
A14 = 1.10559e-003
Third side
K = 4.36307e + 000, A4 = 1.02298e-001, A6 = -1.10820e-001,
A8 = 1.13887e-001, A10 = -7.73968e-002, A12 = 3.02679e-002,
A14 = -4.85976e-003
5th page
K = -1.05288e + 001, A4 = 8.03773e-003, A6 = -6.31082e-002,
A8 = 7.23894e-002, A10 = -5.66858e-002, A12 = 2.19704e-002,
A14 = -3.54000e-003
6th page
K = -3.83762e + 000, A3 = 3.29363e-004, A4 = -2.84048e-002,
A5 = -2.17539e-003, A6 = 8.56233e-002, A8 = -1.51213e-001,
A10 = 1.60736e-001, A12 = -9.79742e-002, A14 = 2.46623e-002
8th page
K = 1.89728e + 001, A3 = -1.68594e-002, A4 = 4.52334e-002,
A5 = -2.02623e-001, A6 = 2.12537e-001, A8 = -1.83276e-001,
A10 = 1.49874e-001, A12 = -8.31354e-002, A14 = 1.63616e-002
9th page
K = 0.00000e + 000, A4 = -1.28346e-001, A6 = 1.68384e-002,
A8 = -1.39014e-003, A10 = -3.16422e-003, A12 = -1.96502e-003
10th page
K = 0.00000e + 000, A4 = -1.07253e-001, A6 = 1.33674e-002,
A8 = 8.06280e-003, A10 = -3.12697e-003, A12 = -2.27241e-005
11th page
K = 2.56707e + 001, A3 = -1.20100e-001, A4 = -6.97855e-002,
A5 = 1.11286e-001, A6 = -1.14865e-001, A8 = 4.31103e-002,
A10 = -1.23434e-002, A12 = 1.21780e-003, A14 = 0.00000e + 000
12th page
K = -2.92093e + 000, A3 = -7.14420e-002, A4 = -3.41254e-001,
A5 = 3.68325e-001, A6 = -2.69803e-001, A8 = 9.93874e-002,
A10 = -1.96777e-002, A12 = 1.33253e-003, A14 = 0.00000e + 000
Side 13
K = -2.13816e + 000, A3 = 3.31706e-002, A4 = -2.71094e-001,
A5 = 1.37274e-001, A6 = -4.95022e-002, A8 = 6.95182e-003,
A10 = 6.40153e-003, A12 = -2.02137e-003, A14 = 1.40635e-004
14th page
K = -7.97432e + 001, A3 = 2.83515e-002, A4 = 4.51436e-002,
A5 = -1.14595e-001, A6 = 8.66370e-002, A8 = -4.36467e-002,
A10 = 1.65817e-002, A12 = -3.57472e-003, A14 = 3.46104e-004
15th page
K = -6.84343e + 000, A3 = -3.72253e-002, A4 = -8.26052e-002,
A5 = 9.87743e-002, A6 = -1.12312e-002, A8 = -1.75794e-002,
A10 = 6.75883e-003, A12 = -1.08801e-003, A14 = 6.54569e-005
16th page
K = 7.96137e + 001, A3 = -8.98099e-002, A4 = -9.22669e-002,
A5 = 3.26750e-002, A6 = 2.22238e-002, A8 = -2.53460e-003,
A10 = -3.34788e-004, A12 = 7.56831e-005, A14 = -3.86230e-006
17th page
K = -6.46364e + 000, A3 = 1.49818e-004, A4 = -1.42290e-001,
A5 = 1.12197e-001, A6 = -3.04811e-002, A8 = 1.31927e-003,
A10 = -2.22673e-004, A12 = 3.03972e-005, A14 = -1.32693e-006

The characteristics of the imaging lens of Example 4 are listed below.
FL 3.793
Fno 1.44
w 75.44
Ymax 2.921
BF 0.917
TL 5.375
BFa 0.879
TLa 5.337

The single lens data of Example 4 is shown in Table 12 below.
[Table 12]
Elem Surfs Focal Length Diameter
1 2- 3 3.5372 2.610
2 5- 6 -4.8250 2.264
3 8- 9 25.3105 2.412
4 10-11 1691.5727 3.061
5 12-13 10.0455 3.442
6 14-15 2.0637 3.959
7 16-17 -1.6287 5.376

  FIG. 11 is a cross-sectional view of the imaging lens 14 and the like of the fourth embodiment. The imaging lens 14 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a meniscus having a negative refractive power around the optical axis AX and a convex surface facing the object side. Second lens L2, a substantially flat third lens L3 having a weak positive refractive power around the optical axis AX, and a meniscus having a weak positive refractive power around the optical axis AX and a convex surface facing the object side. The fourth lens L4, a fifth meniscus lens L5 having a positive refractive power around the optical axis AX and having a convex surface facing the object side, and a positive refractive power around the optical axis AX and a convex surface facing the image side A sixth meniscus lens L6 directed to the right side, and a substantially plano-concave seventh lens L7 having negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the first and second lenses L1 and L2, and between the object side of the outer edge of the first lens L1 and between the second and third lenses L2 and L3, A light-shielding stop FS is disposed.

  12A to 12C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 14 of Example 4, and FIGS. 12D and 12E show the results. 10 shows lateral aberration of the imaging lens 14 of Example 4. FIG.

Example 5
The lens surface data of Example 5 is shown in Table 13 below.
[Table 13]
Surface number rd nd vd eff.dia.
1 FS INFINITY -0.2000 2.700
2 * 1.7926 0.7626 1.54470 56 2.625
3 * -113.1622 0.0500 2.469
4 * 2.0165 0.1500 1.64250 22.5 2.266
5 * 1.2311 0.3674 2.020
STO INFINITY 0.0000 2.018
7 * 4.9714 0.1916 1.54470 56 1.984
8 * 4.3740 0.1263 2.117
9 FS INFINITY 0.1000 2.300
10 * 7.2467 0.6640 1.54470 56 2.353
11 * 17.5412 0.1156 2.897
12 * 9.4860 0.2000 1.63469 23.9 3.275
13 * 7.6337 0.2788 3.347
14 * 4.8348 0.5099 1.54470 56 3.683
15 * -1.9176 0.2670 4.073
16 * 16.6282 0.3070 1.54470 56 4.440
17 * 1.1354 0.7000 4.979
18 INFINITY 0.1100 1.51633 64.1 5.731
19 INFINITY 0.0998

The aspheric coefficients of the lens surfaces of Example 5 are shown in Table 14 below.
[Table 14]
Second side
K = -7.32448e-001, A4 = 2.12231e-002, A6 = 6.01622e-003,
A8 = -4.42254e-003, A10 = 8.28630e-003, A12 = -5.19321e-003,
A14 = 1.46425e-003
Third side
K = 2.28201e + 001, A4 = 6.82123e-002, A6 = -9.93415e-002,
A8 = 1.09933e-001, A10 = -7.95018e-002, A12 = 3.36150e-002,
A14 = -6.08554e-003
4th page
K = -1.26928e + 001, A4 = 3.42206e-003, A6 = -7.10144e-002,
A8 = 7.46353e-002, A10 = -3.63313e-002, A12 = 1.26443e-002,
A14 = -3.53992e-003
5th page
K = -4.48550e + 000, A3 = 1.82361e-003, A4 = 3.33830e-003,
A5 = 1.21468e-002, A6 = 4.89244e-002, A8 = -1.25901e-001,
A10 = 1.77743e-001, A12 = -1.10878e-001, A14 = 3.09625e-002
7th page
K = -3.73773e + 001, A3 = -1.25000e-002, A4 = 3.00205e-002,
A5 = -1.74971e-001, A6 = 2.33954e-001, A8 = -1.97628e-001,
A10 = 1.32321e-001, A12 = -6.23170e-002, A14 = 2.40171e-002
8th page
K = 9.87345e + 000, A3 = -9.49519e-003, A4 = -1.30748e-001,
A5 = 2.64057e-003, A6 = 5.47750e-002, A8 = -4.64005e-002,
A10 = -2.01369e-003, A12 = 9.48386e-003, A14 = 4.85948e-003
10th page
K = 2.77556e + 001, A3 = -3.00569e-003, A4 = -9.96057e-002,
A5 = 4.90875e-003, A6 = 3.29525e-003, A8 = -8.50991e-003,
A10 = -1.21297e-002, A12 = 1.19899e-002, A14 = -1.27631e-003
11th page
K = -8.00000e + 001, A3 = -2.32217e-002, A4 = -9.75271e-002,
A5 = 8.65383e-002, A6 = -1.05897e-001, A8 = 5.17257e-002,
A10 = -1.57755e-002, A12 = 2.73074e-003,
12th page
K = 2.53322e + 001, A3 = 1.31110e-002, A4 = -3.38542e-001,
A5 = 3.76536e-001, A6 = -2.61788e-001, A8 = 9.73605e-002,
A10 = -2.13223e-002, A12 = 1.55861e-003
Side 13
K = 1.44930e + 001, A3 = 4.49894e-003, A4 = -2.56010e-001,
A5 = 1.53023e-001, A6 = -4.93515e-002, A8 = 7.42384e-003,
A10 = 6.52683e-003, A12 = -2.39653e-003, A14 = 1.77958e-004
14th page
K = 3.66614e + 000, A3 = -2.07704e-002, A4 = 3.71577e-002,
A5 = -1.33577e-001, A6 = 1.09656e-001, A8 = -4.95926e-002,
A10 = 1.56191e-002, A12 = -2.48831e-003, A14 = 1.75730e-004
15th page
K = -1.92320e + 001, A3 = -1.17213e-001, A4 = 6.44529e-002,
A5 = 4.54852e-002, A6 = -1.75417e-002, A8 = -1.54415e-002,
A10 = 6.78594e-003, A12 = -1.09352e-003, A14 = 5.85870e-005
16th page
K = 8.56893e + 000, A3 = -2.17398e-001, A4 = -4.20510e-002,
A5 = 4.34765e-002, A6 = 2.12869e-002, A8 = -3.70499e-003,
A10 = -3.61592e-004, A12 = 9.74898e-005, A14 = -4.92407e-006
17th page
K = -6.13137e + 000, A3 = -1.08921e-001, A4 = -5.65300e-002,
A5 = 9.82497e-002, A6 = -3.75212e-002, A8 = 2.17622e-003,
A10 = -1.88382e-004, A12 = 9.43182e-006, A14 = 6.05016e-007

The characteristics of the imaging lens of Example 5 are listed below.
FL 4.027
Fno 1.53
w 72.16
Ymax 2.921
BF 0.910
TL 5.000
BFa 0.872
TLa 4.962

The single lens data of Example 5 is shown in Table 15 below.
[Table 15]
Elem Surfs Focal Length Diameter
1 2- 3 3.2473 2.625
2 4- 5 -5.3172 2.266
3 7-8 -75.3346 2.117
4 10-11 22.1651 2.897
5 12-13 -64.2873 3.347
6 14-15 2.5897 4.073
7 16-17 -2.2530 4.979

  FIG. 13 is a cross-sectional view of the imaging lens 15 and the like according to the fifth embodiment. The imaging lens 15 has, in order from the object side, a substantially convex first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and a negative refractive power around the optical axis AX. The second meniscus lens L2 having a convex surface facing the object side, the third meniscus lens L3 having a weak negative refractive power around the optical axis AX and the convex surface facing the object side, and weak around the optical axis AX A fourth meniscus lens L4 having a positive refractive power and having a convex surface facing the object side; a fifth meniscus lens L5 having a weak negative refractive power around the optical axis AX and having a convex surface facing the object side; A biconvex sixth lens L6 having a positive refractive power around the optical axis AX, and a meniscus seventh lens L7 having a negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2 and L3, and between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4. A light-shielding stop FS is disposed.

  14A to 14C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 15 of Example 5, and FIGS. 14D and 14E show the results. 10 shows lateral aberrations of the imaging lens 15 of Example 5. FIG.

Example 6
Table 16 below shows data on the lens surface of Example 6 which is a reference example not belonging to the present invention .
[Table 16]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.2000 2.700
2 * -2.0889 0.2000 1.54000 45 2.687
3 * -2.3705 0.0500 2.559
4 * 2.1019 0.8219 1.54470 56 2.738
5 * -9.8545 0.1135 2.620
STO INFINITY 0.0000 2.451
7 * 3.4446 0.1500 1.63469 23.9 2.414
8 * 1.7619 0.3002 2.366
9 FS INFINITY 0.0600 2.400
10 * 8.1526 0.5602 1.54470 56 2.504
11 * -8.1776 0.2165 2.608
12 * 4.5185 0.2227 1.63469 23.9 2.613
13 * 2.9326 0.3031 2.811
14 * 6.6293 0.5568 1.54000 45 2.963
15 * -2.1898 0.4995 3.416
16 * -2.1967 0.3375 1.54470 56 3.634
17 * 2.9968 0.4000 4.749
18 INFINITY 0.1100 1.51633 64.1 5.549
19 INFINITY 0.2190

Table 17 below shows the aspheric coefficients of the lens surfaces of Example 6.
[Table 17]
Second side
K = 0.00000e + 000, A4 = 1.08204e-001, A6 = 1.53978e-003,
A8 = -5.54747e-003, A10 = -1.38032e-003, A12 = 1.40192e-003,
A14 = -2.58567e-004
Third side
K = 0.00000e + 000, A4 = 1.19656e-001, A6 = -1.43168e-003,
A8 = 5.27745e-003, A10 = -1.04529e-002, A12 = 4.89255e-003,
A14 = -8.88685e-004
4th page
K = 5.20441e-001, A4 = -5.21736e-003, A6 = 3.15703e-003,
A8 = -3.87144e-003, A10 = 3.81777e-003, A12 = -2.00081e-003,
A14 = 5.29976e-004
5th page
K = -5.23209e + 001, A4 = -2.53845e-002, A6 = 2.18393e-002,
A8 = -5.82485e-003, A10 = -1.05535e-003, A12 = 2.37441e-003,
A14 = -5.73082e-004
7th page
K = -2.43451e + 000, A4 = -1.29226e-001, A6 = 6.22107e-002,
A8 = -3.85874e-003, A10 = -2.94839e-002, A12 = 2.09031e-002,
A14 = -5.06646e-003
8th page
K = -5.78973e + 000, A3 = -2.43400e-003, A4 = -6.17923e-003,
A5 = -6.35972e-002, A6 = 7.12797e-002, A8 = -1.94436e-002,
A10 = 1.56763e-003, A12 = -9.26132e-004, A14 = 1.87076e-003
10th page
K = 1.81668e + 001, A3 = -1.54944e-002, A4 = 6.26988e-002,
A5 = -1.67542e-001, A6 = 1.48364e-001, A8 = -9.76793e-002,
A10 = 6.94077e-002, A12 = -3.56959e-002, A14 = 8.56531e-003
11th page
K = -8.00000e + 001, A3 = -7.37532e-003, A4 = -1.20632e-001,
A5 = 5.69881e-003, A6 = 4.55614e-002, A8 = -4.80622e-002,
A10 = 2.35559e-002, A12 = -5.20555e-003
12th page
K = -4.93030e + 001, A3 = -8.92831e-003, A4 = -2.90242e-001,
A5 = 1.18840e-001, A6 = -2.03222e-003, A8 = -5.37660e-003,
A10 = -1.39227e-002, A12 = 7.82024e-003
Side 13
K = 2.95534e + 000, A3 = -1.83957e-002, A4 = -3.44415e-001,
A5 = 1.29030e-001, A6 = 3.67448e-002, A8 = -4.05159e-002,
A10 = 8.23677e-003, A12 = -1.40783e-003, A14 = 5.95958e-004
14th page
K = -7.16002e + 001, A3 = -1.42797e-002, A4 = -2.87050e-002,
A5 = 1.64613e-002, A6 = -3.37146e-002, A8 = -2.75401e-003,
A10 = 1.40095e-002, A12 = -1.03709e-002, A14 = 2.16802e-003
15th page
K = -3.34228e + 000, A3 = -1.76392e-002, A4 = 2.81902e-002,
A5 = -2.74159e-003, A6 = -2.48857e-002, A8 = 5.64171e-003,
A10 = 2.35754e-003, A12 = -3.21260e-004, A14 = -7.28734e-005
16th page
K = -3.26893e + 000, A3 = -8.10578e-002, A4 = -4.84912e-002,
A5 = 1.35498e-002, A6 = 5.30193e-003, A8 = 9.34881e-004,
A10 = 1.14921e-003, A12 = -7.90249e-005, A14 = -4.11113e-005
17th page
K = -7.81757e + 001, A3 = 9.67677e-002, A4 = -1.95207e-001,
A5 = 1.10902e-001, A6 = -2.49769e-002, A8 = 4.84382e-004,
A10 = -6.04934e-007, A12 = -3.33133e-006, A14 = 3.09410e-007

The characteristics of the imaging lens of Example 6 are listed below.
FL 3.696
Fno 1.45
w 75.43
Ymax 2.921
BF 0.729
TL 5.321
BFa 0.692
TLa 5.283

The single lens data of Example 6 is shown in Table 18 below.
[Table 18]
Elem Surfs Focal Length Diameter
1 2- 3 -43.3748 2.687
2 4- 5 3.2594 2.738
3 7-8 -5.8866 2.414
4 10-11 7.5868 2.608
5 12-13 -13.9241 2.811
6 14-15 3.1173 3.416
7 16-17 -2.2749 4.749

  FIG. 15 is a cross-sectional view of the imaging lens 16 and the like according to the sixth embodiment. The imaging lens 16 includes, in order from the object side, a meniscus first lens L1 having a weak negative refractive power around the optical axis AX and a convex surface facing the image side, and both having a positive refractive power around the optical axis AX. A convex second lens L2, a third meniscus lens L3 having a negative refractive power around the optical axis AX and having a convex surface facing the object side, and a biconvex second lens having a positive refractive power around the optical axis AX. Four lenses L4, a fifth meniscus lens L5 having a negative refractive power around the optical axis AX and having a convex surface facing the object side, and a biconvex sixth lens L6 having a positive refractive power around the optical axis AX And a biconcave seventh lens L7 having negative refractive power around the optical axis AX. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2 and L3, and between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4. A light-shielding stop FS is disposed.

  16A to 16C show various aberration diagrams (spherical aberration, astigmatism, distortion aberration) of the imaging lens 16 of Example 6, and FIGS. 16D and 16E show the examples. The lateral aberration of the imaging lens 16 of Example 6 is shown.

Example 7
The lens surface data of Example 7 is shown in Table 19 below.
[Table 19]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.700
2 * 6.3046 0.2500 1.54470 56.2 2.625
3 * -9.4866 0.2399 2.605
STO INFINITY -0.1899 2.618
5 * 6.1552 0.8055 1.54470 56.2 2.628
6 * -42.4798 0.0500 2.367
7 * 1.5502 0.1500 1.63469 23.9 2.231
8 * 1.0815 0.4141 2.183
9 FS INFINITY 0.0000 2.300
10 * 6.7291 0.4966 1.54470 56.2 2.292
11 * -8.4855 0.2285 2.502
12 * -12.5714 0.2841 1.63469 23.9 2.744
13 * 19.5086 0.4216 3.049
14 * 4.1124 0.5854 1.54470 56.2 3.466
15 * -2.2595 0.3348 3.777
16 * 3.1012 0.3196 1.54470 56.2 4.581
17 * 0.9193 0.7000 5.238
18 INFINITY 0.1100 1.51633 64.1 5.732
19 INFINITY 0.1036

Table 20 below shows the aspheric coefficients of the lens surfaces of Example 7.
[Table 20]
Second side
K = -3.18132e + 000, A4 = -8.42749e-002, A6 = 2.98151e-002,
A8 = 1.20225e-002, A10 = -9.90738e-003, A12 = 3.15687e-003,
A14 = -4.83089e-004
Third side
K = 0.00000e + 000, A4 = 8.18853e-003, A6 = -7.39367e-003,
A8 = 1.71372e-002, A10 = -4.04286e-003
5th page
K = 0.00000e + 000, A4 = 1.22121e-001, A6 = -5.88922e-002,
A8 = 2.16243e-002, A10 = 1.88365e-003, A12 = -4.10725e-003,
A14 = 1.23043e-003
6th page
K = -8.00000e + 001, A4 = 8.97433e-002, A6 = -1.43315e-001,
A8 = 1.22827e-001, A10 = -6.63551e-002, A12 = 2.48543e-002,
A14 = -4.86280e-003
7th page
K = -9.98047e + 000, A4 = -3.05894e-002, A6 = -8.63774e-002,
A8 = 6.45443e-002, A10 = -2.29745e-002, A12 = 7.02732e-003,
A14 = -3.54185e-003
8th page
K = -5.00816e + 000, A3 = 6.20312e-005, A4 = -3.57506e-002,
A5 = -8.86682e-003, A6 = 5.27635e-002, A8 = -1.28898e-001,
A10 = 1.69685e-001, A12 = -1.10465e-001, A14 = 2.74896e-002
10th page
K = 2.92067e + 001, A3 = -2.25310e-002, A4 = 7.14700e-002,
A5 = -2.64148e-001, A6 = 2.63231e-001, A8 = -1.82365e-001,
A10 = 1.22328e-001, A12 = -6.69479e-002, A14 = 1.37178e-002
11th page
K = -7.41328e + 000, A3 = 2.78211e-002, A4 = -1.76722e-001,
A5 = 1.10775e-001, A6 = -6.83699e-002, A8 = 2.50527e-002,
A10 = -1.16384e-002, A12 = 6.71983e-004
12th page
K = 8.00000e + 001, A3 = 7.44190e-002, A4 = -4.75423e-001,
A5 = 4.00836e-001, A6 = -2.07634e-001, A8 = 1.07831e-001,
A10 = -2.43620e-002, A12 = -6.00379e-004
Side 13
K = -8.00000e + 001, A3 = 3.49696e-002, A4 = -3.40559e-001,
A5 = 1.72525e-001, A6 = -1.46331e-002, A8 = 1.31068e-002,
A10 = 2.27015e-003, A12 = -3.11352e-003, A14 = 2.70093e-004
14th page
K = 9.68760e-002, A3 = -1.09570e-002, A4 = 3.61112e-002,
A5 = -1.33785e-001, A6 = 8.78463e-002, A8 = -3.80285e-002,
A10 = 1.52616e-002, A12 = -3.49773e-003, A14 = 3.26590e-004
15th page
K = -1.85389e + 001, A3 = -8.90869e-002, A4 = 5.49142e-002,
A5 = 1.93718e-002, A6 = -3.00384e-002, A8 = -1.02180e-002,
A10 = 7.54221e-003, A12 = -1.23949e-003, A14 = 4.71979e-005
16th page
K = -4.32755e + 001, A3 = -1.87586e-001, A4 = -1.21890e-001,
A5 = 6.61914e-002, A6 = 2.75434e-002, A8 = -4.72995e-003,
A10 = -4.37315e-004, A12 = 1.32823e-004, A14 = -7.74779e-006
17th page
K = -3.90456e + 000, A3 = -1.42503e-001, A4 = -7.46234e-002,
A5 = 1.17662e-001, A6 = -3.72449e-002, A8 = 1.21959e-003,
A10 = -1.07047e-004, A12 = 1.44805e-005, A14 = -5.73559e-007

The characteristics of the imaging lens of Example 7 are listed below.
FL 3.756
Fno 1.43
w 75.39
Ymax 2.921
BF 0.914
TL 5.304
BFa 0.876
TLa 5.266

The single lens data of Example 7 is shown in Table 21 below.
[Table 21]
Elem Surfs Focal Length Diameter
1 2- 3 6.9924 2.625
2 5--6 9.9281 2.628
3 7- 8 -6.4349 2.231
4 10-11 6.9702 2.502
5 12-13 -12.0039 3.049
6 14-15 2.7668 3.777
7 16-17 -2.5293 5.238

  FIG. 17 is a cross-sectional view of the imaging lens 17 and the like of the seventh embodiment. The imaging lens 17 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a substantially convex surface having a positive refractive power around the optical axis AX and facing the object side. A convex second lens L2, a meniscus third lens L3 having a negative refractive power around the optical axis AX and a convex surface facing the object side, and a biconvex having a positive refractive power around the optical axis AX A fourth lens L4, a biconcave fifth lens L5 having negative refractive power around the optical axis AX, a biconvex sixth lens L6 having positive refractive power around the optical axis AX, and the periphery of the optical axis AX And a meniscus seventh lens L7 having negative refractive power and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the first and second lenses L1 and L2, and between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4, A light-shielding stop FS is disposed.

  18A to 18C show various aberration diagrams (spherical aberration, astigmatism, distortion aberration) of the imaging lens 17 of Example 7, and FIGS. 18D and 18E show the examples. 10 shows lateral aberration of the imaging lens 17 of Example 7. FIG.

Example 8
The lens surface data of Example 8 is shown in Table 22 below.
[Table 22]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.1200 2.719
2 * -2.6118 0.2000 1.54000 45 2.710
3 * -2.9734 0.3803 2.571
4 FS INFINITY -0.3303 2.658
5 * 1.9042 0.8622 1.54470 56 2.735
6 * -14.3008 0.0000 2.634
STO INFINITY 0.1286 2.548
8 * 7.0726 0.1500 1.63469 23.9 2.410
9 * 2.2078 0.3030 2.214
10 FS INFINITY 0.0000 2.240
11 * 5.5742 0.4916 1.54470 56 2.364
12 * -32.1022 0.2345 2.458
13 * 3.0804 0.2000 1.63469 23.9 2.478
14 * 2.6279 0.2870 2.674
15 * 6.6362 0.3426 1.54000 45 2.800
16 * -2.9087 0.6350 3.211
17 * -2.3861 0.3227 1.54470 56 3.671
18 * 3.2217 0.4000 4.617
19 INFINITY 0.1100 1.51633 64.1 5.600
20 INFINITY 0.1648

Table 23 below shows the aspheric coefficients of the lens surfaces of Example 8.
[Table 23]
Second side
K = 0.00000e + 000, A4 = 8.66377e-002, A6 = 3.41365e-003,
A8 = -3.10253e-003, A10 = -1.32314e-003, A12 = 8.49806e-004,
A14 = -1.57371e-004
Third side
K = 0.00000e + 000, A4 = 9.89752e-002, A6 = 1.97075e-003,
A8 = 7.77106e-003, A10 = -1.02422e-002, A12 = 5.24427e-003,
A14 = -1.11775e-003
5th page
K = 2.05205e-001, A4 = -6.38897e-003, A6 = 9.70827e-004,
A8 = -4.41012e-003, A10 = 3.72338e-003, A12 = -1.82964e-003,
A14 = 3.80674e-004
6th page
K = 4.04715e + 001, A4 = -3.44214e-002, A6 = 1.97723e-002,
A8 = -2.55265e-003, A10 = -1.51412e-003, A12 = 1.02973e-003,
A14 = -9.06250e-005
8th page
K = 1.13228e + 001, A4 = -1.13344e-001, A6 = 7.67389e-002,
A8 = -4.98718e-003, A10 = -3.10363e-002, A12 = 2.01553e-002,
A14 = -4.28410e-003
9th page
K = -7.55781e + 000, A3 = -3.06228e-003, A4 = 1.07611e-003,
A5 = -5.09050e-002, A6 = 8.60696e-002, A8 = -1.79738e-002,
A10 = -1.85391e-003, A12 = -2.35451e-004, A14 = 2.87368e-003
11th page
K = 1.21089e + 001, A3 = -1.78166e-002, A4 = 5.60649e-002,
A5 = -1.74922e-001, A6 = 1.51516e-001, A8 = -9.35294e-002,
A10 = 6.96969e-002, A12 = -3.57119e-002, A14 = 9.35937e-003
12th page
K = -7.67350e + 001, A3 = -1.16000e-002, A4 = -9.65332e-002,
A5 = 1.16432e-002, A6 = 3.14841e-002, A8 = -5.38177e-002,
A10 = 2.92519e-002, A12 = -5.95350e-003
Side 13
K = -1.76118e + 001, A3 = -1.66768e-002, A4 = -2.82736e-001,
A5 = 1.18434e-001, A6 = -5.69067e-003, A8 = -2.08740e-002,
A10 = -1.56115e-002, A12 = 9.87586e-003
14th page
K = 2.57198e + 000, A3 = -2.17822e-002, A4 = -3.71147e-001,
A5 = 1.25519e-001, A6 = 3.41324e-002, A8 = -4.20787e-002,
A10 = 5.95502e-003, A12 = -2.53658e-003, A14 = 1.14333e-003
15th page
K = -6.89757e + 001, A3 = -3.37431e-002, A4 = -1.10107e-002,
A5 = -1.37735e-002, A6 = -5.65327e-002, A8 = 1.22081e-002,
A10 = 2.08289e-002, A12 = -2.00191e-002, A14 = 4.40044e-003
16th page
K = -1.38743e + 001, A3 = -3.96781e-002, A4 = -2.34418e-003,
A5 = -7.77839e-003, A6 = -2.94887e-002, A8 = 1.16843e-002,
A10 = 3.62369e-003, A12 = -6.35622e-004, A14 = -1.86518e-004
17th page
K = -3.13432e-001, A3 = -1.10807e-001, A4 = -6.36104e-002,
A5 = 4.02999e-002, A6 = 1.64647e-002, A8 = -8.18427e-004,
A10 = 5.80182e-004, A12 = -2.17031e-004, A14 = 7.91834e-006
18th page
K = -8.00000e + 001, A3 = 2.20638e-002, A4 = -1.44001e-001,
A5 = 1.00504e-001, A6 = -2.62785e-002, A8 = 8.72918e-004,
A10 = -4.66588e-005, A12 = -1.10324e-005, A14 = 1.98010e-006

The characteristics of the imaging lens of Example 8 are listed below.
FL 3.695
Fno 1.45
w 75.43
Ymax 2.921
BF 0.675
TL 5.002
BFa 0.637
TLa 4.964

The single lens data of Example 8 is shown in Table 24 below.
[Table 24]
Elem Surfs Focal Length Diameter
1 2- 3 -49.3261 2.710
2 5- 6 3.1440 2.735
3 8- 9 -5.1185 2.410
4 11-12 8.7598 2.458
5 13-14 -34.0261 2.674
6 15-16 3.7927 3.211
7 17-18 -2.4666 4.617

  FIG. 19 is a cross-sectional view of the imaging lens 18 and the like of the eighth embodiment. The imaging lens 18 includes, in order from the object side, a meniscus first lens L1 having a weak negative refractive power around the optical axis AX and a convex surface facing the image side, and both having a positive refractive power around the optical axis AX. A convex second lens L2, a third meniscus lens L3 having a negative refractive power around the optical axis AX and having a convex surface directed toward the object side, and a positive refractive power around the optical axis AX toward the object side A substantially convex fourth lens L4 having a convex surface, a fifth meniscus lens L5 having a weak negative refractive power around the optical axis AX and a convex surface facing the object side, and positive refraction around the optical axis AX A biconvex sixth lens L6 having power and a biconcave seventh lens L7 having negative refractive power around the optical axis AX. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2 and L3, and between the object side of the outer edge of the first lens L1 and between the first and second lenses L1 and L2. A light-shielding stop FS is disposed.

  20A to 20C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 18 of Example 8, and FIGS. 20D and 20E show the results. 10 shows lateral aberration of the imaging lens 18 of Example 8. FIG.

Example 9
The lens surface data of Example 9 is shown in Table 25 below.
[Table 25]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.1900 2.720
2 * -2.0640 0.3010 1.54000 45 2.702
3 * -2.5035 0.2330 2.303
STO INFINITY -0.0800 2.369
5 * 2.2172 0.8051 1.54470 56 2.550
6 * -3.9551 0.0500 2.533
7 FS INFINITY 0.0000 2.400
8 * 2.6308 0.1500 1.63469 23.9 2.418
9 * 1.4371 0.3675 2.533
10 * -3e + 003 0.5420 1.54470 56 2.602
11 * -4.6031 0.1093 2.620
12 * 3.1977 0.2000 1.63469 23.9 2.543
13 * 2.0191 0.3014 2.699
14 * 4.9249 0.4349 1.54000 45 2.816
15 * -2.1746 0.5174 3.152
16 * -4.7441 0.3164 1.54470 56 3.711
17 * 1.9953 0.4000 4.616
18 INFINITY 0.1100 1.51633 64.1 5.391
19 INFINITY 0.2534

Table 26 below shows the aspheric coefficients of the lens surfaces of Example 9.
[Table 26]
Second side
K = 0.00000e + 000, A4 = 1.18496e-001, A6 = -1.08715e-002,
A8 = 6.53424e-004, A10 = -1.87619e-003, A12 = 1.05565e-003,
A14 = -1.99488e-004
Third side
K = 0.00000e + 000, A4 = 1.30967e-001, A6 = -3.82055e-003,
A8 = 1.83699e-003, A10 = -1.74657e-003, A12 = 1.37785e-003,
A14 = -4.68160e-004
5th page
K = -1.58016e-001, A4 = -7.22487e-003, A6 = 1.96485e-003,
A8 = -3.49944e-003, A10 = 2.38231e-003, A12 = -8.74902e-004,
A14 = -3.10344e-005
6th page
K = 3.99718e + 000, A4 = 5.42379e-003, A6 = 4.64837e-003,
A8 = -5.51843e-003, A10 = 2.98692e-003, A12 = -3.23195e-004,
A14 = -1.38998e-004
8th page
K = -8.84856e-001, A4 = -1.25294e-001, A6 = 5.26371e-002,
A8 = -5.16284e-003, A10 = -2.93759e-002, A12 = 1.95055e-002,
A14 = -4.41679e-003
9th page
K = -3.20126e + 000, A3 = -1.01762e-002, A4 = -1.51424e-002,
A5 = -6.73742e-002, A6 = 8.69116e-002, A8 = -2.69992e-002,
A10 = -3.12997e-003, A12 = 3.46931e-003, A14 = -1.13281e-003
10th page
K = -8.00000e + 001, A3 = -3.37845e-003, A4 = 9.41367e-002,
A5 = -1.62505e-001, A6 = 1.41797e-001, A8 = -9.17879e-002,
A10 = 7.39969e-002, A12 = -3.12384e-002, A14 = 4.92381e-003
11th page
K = -5.84934e + 001, A3 = -1.92715e-003, A4 = -9.41768e-002,
A5 = 7.52025e-003, A6 = 2.74069e-002, A8 = -5.21631e-002,
A10 = 3.31542e-002, A12 = -5.89766e-003
12th page
K = -1.21120e + 001, A3 = -2.45539e-002, A4 = -2.69353e-001,
A5 = 1.18346e-001, A6 = 1.63695e-002, A8 = -3.13570e-002,
A10 = -1.95222e-002, A12 = 1.38046e-002
Side 13
K = 1.05933e + 000, A3 = -1.96768e-002, A4 = -4.07223e-001,
A5 = 1.73465e-001, A6 = 3.43064e-002, A8 = -5.56597e-002,
A10 = 9.01372e-003, A12 = -1.45351e-003, A14 = 9.96933e-004
14th page
K = -1.22865e + 000, A3 = -2.14395e-002, A4 = -6.76967e-003,
A5 = -2.41383e-002, A6 = -4.07694e-002, A8 = 9.68868e-004,
A10 = 2.41787e-002, A12 = -1.91126e-002, A14 = 3.95700e-003
15th page
K = -4.91745e + 000, A3 = -1.15474e-002, A4 = 2.44653e-002,
A5 = 9.82954e-003, A6 = -5.62544e-002, A8 = 1.08070e-002,
A10 = 5.84553e-003, A12 = -9.12457e-004, A14 = -2.11530e-004
16th page
K = 6.05456e-001, A3 = -1.24505e-001, A4 = -6.21168e-002,
A5 = 2.61098e-002, A6 = 1.75575e-002, A8 = 1.30561e-003,
A10 = 1.17113e-004, A12 = -3.16955e-004, A14 = 3.79497e-005
17th page
K = -2.31247e + 001, A3 = 4.10107e-002, A4 = -1.76061e-001,
A5 = 1.24745e-001, A6 = -3.32487e-002, A8 = 6.17052e-004,
A10 = 1.19239e-004, A12 = -2.82415e-005, A14 = 2.46103e-006

The characteristics of the imaging lens of Example 9 are listed below.
FL 3.235
Fno 1.45
w 83.95
Ymax 2.921
BF 0.763
TL 5.201
BFa 0.726
TLa 5.164

The single lens data of Example 9 is shown in Table 27 below.
[Table 27]
Elem Surfs Focal Length Diameter
1 2- 3 -28.6566 2.702
2 5--6 2.7341 2.550
3 8- 9 -5.2461 2.533
4 10-11 8.4631 2.620
5 12-13 -9.2400 2.699
6 14-15 2.8548 3.152
7 16-17 -2.5366 4.616

  FIG. 21 is a cross-sectional view of the imaging lens 19 and the like of the ninth embodiment. The imaging lens 19 includes, in order from the object side, a meniscus first lens L1 having a weak negative refractive power around the optical axis AX and a convex surface facing the image side, and both having a positive refractive power around the optical axis AX. A convex second lens L2, a third meniscus lens L3 having a negative refractive power around the optical axis AX and having a convex surface facing the object side, and a positive refractive power around the optical axis AX and having a positive refractive power on the image side A substantially planoconvex fourth lens L4 having a convex surface, a meniscus fifth lens L5 having a negative refractive power around the optical axis AX and a convex surface facing the object side, and a positive refractive power around the optical axis AX A biconvex sixth lens L6 and a biconcave seventh lens L7 having negative refractive power around the optical axis AX. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the first and second lenses L1 and L2, and between the object side of the outer edge of the first lens L1 and between the second and third lenses L2 and L3, A light-shielding stop FS is disposed.

  22A to 22C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 19 of Example 9, and FIGS. 22D and 22E show the results. 10 shows lateral aberrations of the imaging lens 19 of Example 9. FIG.

Example 10
The lens surface data of Example 10 is shown in Table 28 below.
[Table 28]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.1500 2.700
2 * -4.1482 0.3069 1.54470 56 2.573
3 * -5.3036 0.2479 2.471
STO INFINITY -0.1979 2.480
5 * 2.1867 0.7201 1.54470 56 2.598
6 * -9.4776 0.0533 2.524
7 * 3.2637 0.1591 1.63469 23.9 2.407
8 * 1.6582 0.3000 2.403
9 FS INFINITY -0.0300 2.360
10 * 4.9743 0.4519 1.54470 56 2.472
11 * -19.1666 0.3289 2.503
12 * 2.6601 0.2042 1.63469 23.9 2.453
13 * 2.2169 0.3338 2.645
14 * 7.6349 0.7167 1.54470 56 2.800
15 * -2.0275 0.4107 3.300
16 * -3.5168 0.3493 1.54470 56 3.480
17 * 1.8358 0.4000 4.760
18 INFINITY 0.1100 1.51633 64.1 5.600
19 INFINITY 0.2649

Table 29 below shows the aspheric coefficients of the lens surfaces of Example 10.
[Table 29]
Second side
K = 0.00000e + 000, A4 = 5.96877e-002, A6 = -1.15602e-003,
A8 = -9.60282e-004, A10 = -3.09630e-003, A12 = 1.44483e-003,
A14 = -2.28463e-004
Third side
K = 0.00000e + 000, A4 = 9.04162e-002, A6 = -1.93363e-003,
A8 = 3.49298e-003, A10 = -4.32480e-003, A12 = -3.27685e-004,
A14 = 2.18563e-004
5th page
K = 2.79466e-001, A4 = -1.22985e-004, A6 = 1.10119e-003,
A8 = -8.40028e-004, A10 = 2.41108e-003, A12 = -1.32580e-003,
A14 = 2.79306e-004
6th page
K = 3.66669e + 001, A4 = -1.83739e-002, A6 = 1.96437e-002,
A8 = -4.93325e-003, A10 = 1.92883e-003, A12 = -2.82615e-004,
A14 = 1.48358e-005
7th page
K = -1.37230e + 000, A4 = -1.27878e-001, A6 = 5.49794e-002,
A8 = -5.58528e-003, A10 = -3.18575e-002, A12 = 1.85001e-002,
A14 = -4.26671e-003
8th page
K = -4.10535e + 000, A3 = -9.49133e-003, A4 = -1.73177e-002,
A5 = -6.85814e-002, A6 = 8.21449e-002, A8 = -2.92922e-002,
A10 = -3.39264e-003, A12 = 3.13129e-003, A14 = -5.58880e-004
10th page
K = -1.47619e + 001, A3 = -2.34465e-002, A4 = 9.12355e-002,
A5 = -1.58548e-001, A6 = 1.40968e-001, A8 = -9.82761e-002,
A10 = 7.27274e-002, A12 = -2.95451e-002, A14 = 4.72464e-003
11th page
K = -8.00000e + 001, A3 = -8.73072e-003, A4 = -7.62082e-002,
A5 = 1.17446e-002, A6 = 2.39115e-002, A8 = -5.41515e-002,
A10 = 3.19100e-002, A12 = -5.54421e-003
12th page
K = -1.36579e + 001, A3 = 6.48169e-003, A4 = -2.54841e-001,
A5 = 1.17885e-001, A6 = 1.14566e-002, A8 = -3.24245e-002,
A10 = -1.94061e-002, A12 = 1.18033e-002
Side 13
K = 1.47635e + 000, A3 = 1.14752e-002, A4 = -4.01103e-001,
A5 = 1.69711e-001, A6 = 3.15451e-002, A8 = -5.44365e-002,
A10 = 9.05868e-003, A12 = -1.25098e-003, A14 = 1.14482e-003
14th page
K = 7.69308e + 000, A3 = -2.45655e-003, A4 = -5.10921e-002,
A5 = -1.74267e-002, A6 = -1.59404e-002, A8 = -1.19933e-002,
A10 = 2.64976e-002, A12 = -1.67167e-002, A14 = 3.22577e-003
15th page
K = -6.53250e + 000, A3 = -6.40765e-003, A4 = -1.04050e-002,
A5 = 1.08573e-002, A6 = -4.68058e-002, A8 = 1.22102e-002,
A10 = 3.54713e-003, A12 = -1.45410e-003, A14 = 1.06181e-004
16th page
K = 2.37754e + 000, A3 = -6.76175e-002, A4 = -1.09426e-001,
A5 = 2.83541e-002, A6 = 2.10496e-002, A8 = 9.86885e-004,
A10 = 1.47129e-004, A12 = -3.14647e-004, A14 = 7.01794e-005
17th page
K = -1.48036e + 001, A3 = 2.43759e-002, A4 = -1.75141e-001,
A5 = 1.24696e-001, A6 = -3.05571e-002, A8 = -1.66295e-004,
A10 = 2.62886e-004, A12 = -3.66610e-005, A14 = 1.79919e-006

The characteristics of the imaging lens of Example 10 are listed below.
FL 3.613
Fno 1.49
w 76.69
Ymax 2.921
BF 0.775
TL 5.280
BFa 0.737
TLa 5.242

The single lens data of Example 10 is shown in Table 30 below.
[Table 30]
Elem Surfs Focal Length Diameter
1 2- 3 -38.5706 2.573
2 5- 6 3.3345 2.598
3 7-8 -5.5236 2.407
4 10-11 7.2987 2.503
5 12-13 -25.5295 2.645
6 14-15 3.0202 3.300
7 16-17 -2.1646 4.760

  FIG. 23 is a cross-sectional view of the imaging lens 20 and the like of the tenth embodiment. The imaging lens 20 includes, in order from the object side, a first meniscus lens L1 having a weak negative refractive power around the optical axis AX and a convex surface facing the image side, and a positive refractive power around the optical axis AX. A convex second lens L2, a third meniscus lens L3 having a negative refractive power around the optical axis AX and having a convex surface facing the object side, and a biconvex second lens having a positive refractive power around the optical axis AX. Four lenses L4, a fifth meniscus lens L5 having a weak negative refractive power around the optical axis AX and having a convex surface facing the object side, and a sixth biconvex lens having a positive refractive power around the optical axis AX L6 and a biconcave seventh lens L7 having negative refractive power around the optical axis AX. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the first and second lenses L1 and L2, and between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4, A light-shielding stop FS is disposed.

  24A to 24C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 20 of Example 10, and FIGS. 24D and 24E show the examples. The lateral aberration of the imaging lens 20 of Example 10 is shown.

Example 11
The lens surface data of Example 11 is shown in Table 31 below.
[Table 31]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.700
2 * 3.0877 0.2429 1.54470 56 2.625
3 * 10.0569 0.0500 2.537
4 * 3.8007 0.6008 1.54470 56 2.584
5 * -38.7267 0.1500 2.488
STO INFINITY -0.1000 2.356
7 * 1.5698 0.1500 1.64250 22.5 2.301
8 * 1.0947 0.4196 2.113
9 FS INFINITY 0.1000 2.160
10 * 8.9139 0.4687 1.54470 56 2.260
11 * -11.1215 0.2354 2.478
12 * -12.0730 0.3091 1.64250 22.5 2.736
13 * 155.8189 0.2481 3.052
14 * 5.3402 0.6051 1.54470 56 3.268
15 * -2.3027 0.2949 3.772
16 * 3.5400 0.3154 1.54470 56 4.487
17 * 0.9517 0.7000 4.998
18 INFINITY 0.1100 1.51633 64.1 5.800
19 INFINITY 0.0998

Table 32 below shows the aspheric coefficients of the lens surfaces of Example 11.
[Table 32]
Second side
K = 3.14469e + 000, A4 = -6.95429e-002, A6 = 1.31284e-002,
A8 = 1.63304e-002, A10 = -9.21230e-003, A12 = 3.19837e-003,
A14 = -8.18358e-004
Third side
K = 0.00000e + 000, A4 = 2.58570e-002, A6 = -8.95477e-003,
A8 = 1.95481e-002, A10 = -1.45187e-003
4th page
K = 0.00000e + 000, A4 = 1.28437e-001, A6 = -5.40014e-002,
A8 = 1.69899e-002, A10 = 3.32878e-003, A12 = -4.10499e-003,
A14 = 1.28852e-003
5th page
K = -7.99672e + 001, A4 = 1.11510e-001, A6 = -1.57728e-001,
A8 = 1.20500e-001, A10 = -6.74656e-002, A12 = 2.67600e-002,
A14 = -4.86280e-003
7th page
K = -1.03254e + 001, A4 = -1.90187e-002, A6 = -8.38271e-002,
A8 = 5.85852e-002, A10 = -1.32169e-002, A12 = 6.99676e-003,
A14 = -3.54185e-003
8th page
K = -5.18781e + 000, A3 = 1.38754e-003, A4 = -2.37274e-002,
A5 = -3.20132e-003, A6 = 5.23434e-002, A8 = -1.27542e-001,
A10 = 1.74784e-001, A12 = -1.04428e-001, A14 = 2.54802e-002
10th page
K = 4.29327e + 001, A3 = -2.62788e-002, A4 = 7.21461e-002,
A5 = -2.60745e-001, A6 = 2.51901e-001, A8 = -1.73488e-001,
A10 = 1.23271e-001, A12 = -7.38758e-002, A14 = 1.94337e-002
11th page
K = 3.04695e + 001, A3 = 2.32952e-002, A4 = -1.88217e-001,
A5 = 1.02995e-001, A6 = -5.89021e-002, A8 = 2.71134e-002,
A10 = -1.63347e-002, A12 = 2.80196e-003
12th page
K = 7.30212e + 001, A3 = 9.58973e-002, A4 = -4.80614e-001,
A5 = 3.96710e-001, A6 = -2.12112e-001, A8 = 1.07657e-001,
A10 = -2.35607e-002, A12 = -7.15687e-004
Side 13
K = 5.79513e + 001, A3 = 7.30018e-002, A4 = -3.61439e-001,
A5 = 1.67587e-001, A6 = -1.34589e-002, A8 = 1.20160e-002,
A10 = 2.99846e-003, A12 = -2.61492e-003, A14 = 9.51885e-005
14th page
K = 7.80952e + 000, A3 = -1.80172e-002, A4 = 3.57360e-002,
A5 = -1.29570e-001, A6 = 7.05478e-002, A8 = -3.21922e-002,
A10 = 1.38504e-002, A12 = -4.03986e-003, A14 = 5.43929e-004
15th page
K = -1.58022e + 001, A3 = -1.14890e-001, A4 = 1.32161e-001,
A5 = -1.39512e-002, A6 = -3.92826e-002, A8 = -5.44582e-003,
A10 = 7.43779e-003, A12 = -1.47065e-003, A14 = 8.18453e-005
16th page
K = -7.87638e + 001, A3 = -1.82043e-001, A4 = -1.37148e-001,
A5 = 7.15714e-002, A6 = 2.93848e-002, A8 = -4.85530e-003,
A10 = -4.60160e-004, A12 = 1.31370e-004, A14 = -7.23796e-006
17th page
K = -5.01194e + 000, A3 = -1.18906e-001, A4 = -7.87955e-002,
A5 = 1.07798e-001, A6 = -3.49386e-002, A8 = 1.66878e-003,
A10 = -1.65037e-004, A12 = 3.77975e-006, A14 = 1.32544e-006

The characteristics of the imaging lens of Example 11 are listed below.
FL 3.786
Fno 1.44
w 74.22
Ymax 2.921
BF 0.910
TL 5.000
BFa 0.872
TLa 4.962

Single lens data of Example 11 are shown in Table 33 below.
[Table 33]
Elem Surfs Focal Length Diameter
1 2- 3 8.0809 2.625
2 4--5 6.3857 2.584
3 7- 8 -6.4234 2.301
4 10-11 9.1595 2.478
5 12-13 -17.4268 3.052
6 14-15 3.0386 3.772
7 16-17 -2.4971 4.998

  FIG. 25 is a cross-sectional view of the imaging lens 21 and the like according to the eleventh embodiment. The imaging lens 21 includes, in order from the object side, a first meniscus lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and an object having a positive refractive power around the optical axis AX. A substantially convex second lens L2 having a convex surface facing the side, a meniscus third lens L3 having a negative refractive power around the optical axis AX and a convex surface facing the object side, and positive around the optical axis AX A biconvex fourth lens L4 having refractive power, a substantially concave fifth lens L5 having negative refractive power around the optical axis AX and having a concave surface facing the object side, and positive refraction around the optical axis AX A biconvex sixth lens L6 having power, and a meniscus seventh lens L7 having negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2 and L3, and between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4. A light-shielding stop FS is disposed.

  FIGS. 26A to 26C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 21 of Example 11, and FIGS. 26D and 26E show the examples. 10 shows lateral aberrations of the imaging lens 21 of Example 11. FIG.

Example 12
The lens surface data of Example 12 is shown in Table 34 below.
[Table 34]
Surface number rd nd vd eff.dia.
STO INFINITY 0.0000 2.625
2 * 3.9844 0.2500 1.54470 56.2 2.625
3 * -30.0690 0.0500 2.546
4 * 6.0010 0.8255 1.54470 56.2 2.595
5 * -59.5129 0.0500 2.362
6 * 1.7173 0.1500 1.63469 23.9 2.222
7 * 1.1598 0.3360 2.239
8 FS INFINITY 0.0700 2.240
9 * 7.3807 0.4852 1.54470 56.2 2.345
10 * -8.1001 0.1857 2.535
11 * -11.5969 0.2009 1.63469 23.9 2.719
12 * 76.2965 0.4224 2.980
13 * 4.1635 0.4970 1.54470 56.2 3.487
14 * -2.9703 0.3533 3.916
15 * 2.7197 0.3145 1.54470 56.2 4.669
16 * 0.9380 0.7000 5.118
17 INFINITY 0.1100 1.51633 64.1 5.749
18 INFINITY 0.1000

Table 35 below shows the aspheric coefficients of the lens surfaces of Example 12.
[Table 35]
Second side
K = 4.75904e + 000, A4 = -7.08543e-002, A6 = 2.55215e-002,
A8 = 1.38998e-002, A10 = -9.41272e-003, A12 = 3.29702e-003,
A14 = -6.31931e-004
Third side
K = 0.00000e + 000, A4 = 4.35606e-002, A6 = -9.54602e-003,
A8 = 1.85383e-002, A10 = -1.40441e-003
4th page
K = 0.00000e + 000, A4 = 1.30180e-001, A6 = -5.58269e-002,
A8 = 1.60864e-002, A10 = 4.04500e-003, A12 = -3.62188e-003,
A14 = 9.01883e-004
5th page
K = 8.00000e + 001, A4 = 9.01890e-002, A6 = -1.49124e-001,
A8 = 1.23306e-001, A10 = -6.63402e-002, A12 = 2.44064e-002,
A14 = -4.86280e-003
6th page
K = -1.21402e + 001, A4 = -2.39782e-002, A6 = -8.57697e-002,
A8 = 6.26993e-002, A10 = -2.05358e-002, A12 = 6.11980e-003,
A14 = -3.54185e-003
7th page
K = -5.47502e + 000, A3 = -2.60490e-003, A4 = -3.00630e-002,
A5 = -5.35854e-003, A6 = 5.34571e-002, A8 = -1.28165e-001,
A10 = 1.69419e-001, A12 = -1.10209e-001, A14 = 2.73640e-002
9th page
K = 3.57434e + 001, A3 = -1.96169e-002, A4 = 6.63363e-002,
A5 = -2.56825e-001, A6 = 2.55907e-001, A8 = -1.76594e-001,
A10 = 1.25144e-001, A12 = -7.10711e-002, A14 = 1.46368e-002
10th page
K = -4.02829e + 001, A3 = 3.52067e-002, A4 = -1.76533e-001,
A5 = 9.55274e-002, A6 = -6.44083e-002, A8 = 3.07867e-002,
A10 = -1.38879e-002, A12 = 4.93146e-004
11th page
K = 7.08494e + 001, A3 = 8.14154e-002, A4 = -4.95365e-001,
A5 = 3.98250e-001, A6 = -2.00913e-001, A8 = 1.13885e-001,
A10 = -2.31332e-002, A12 = -2.02245e-003
12th page
K = -8.00000e + 001, A3 = 3.31536e-002, A4 = -3.67414e-001,
A5 = 1.78404e-001, A6 = -5.72966e-003, A8 = 1.56134e-002,
A10 = 3.66127e-003, A12 = -3.11167e-003, A14 = -1.43138e-004
Side 13
K = 1.41456e + 000, A3 = -1.51148e-002, A4 = 3.96559e-002,
A5 = -1.33805e-001, A6 = 8.70433e-002, A8 = -3.59301e-002,
A10 = 1.38929e-002, A12 = -3.62507e-003, A14 = 4.30313e-004
14th page
K = -3.53240e + 001, A3 = -1.08710e-001, A4 = 9.12049e-002,
A5 = 5.94547e-003, A6 = -3.25071e-002, A8 = -7.49311e-003,
A10 = 7.15214e-003, A12 = -1.40165e-003, A14 = 8.23359e-005
15th page
K = -3.82502e + 001, A3 = -2.04424e-001, A4 = -1.33618e-001,
A5 = 7.21841e-002, A6 = 2.96147e-002, A8 = -4.86011e-003,
A10 = -4.75408e-004, A12 = 1.30382e-004, A14 = -6.98084e-006
16th page
K = -4.35152e + 000, A3 = -1.43655e-001, A4 = -7.65365e-002,
A5 = 1.13460e-001, A6 = -3.54246e-002, A8 = 1.30899e-003,
A10 = -1.53250e-004, A12 = 7.21323e-006, A14 = 8.72515e-007

The characteristics of the imaging lens of Example 12 are listed below.
FL 3.774
Fno 1.44
w 75.40
Ymax 2.921
BF 0.910
TL 5.100
BFa 0.873
TLa 5.063

Single lens data of Example 12 are shown in Table 36 below.
[Table 36]
Elem Surfs Focal Length Diameter
1 2- 3 6.4758 2.625
2 4- 5 10.0526 2.595
3 6- 7 -6.2855 2.239
4 9-10 7.1691 2.535
5 11-12 -15.8469 2.980
6 13-14 3.2628 3.916
7 15-16 -2.8032 5.118

  FIG. 27 is a cross-sectional view of the imaging lens 22 and the like of the twelfth embodiment. The imaging lens 22 has, in order from the object side, a substantially convex first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and a positive refractive power around the optical axis AX. A substantially convex second lens L2 having a convex surface facing the object side, a third meniscus lens L3 having a negative refractive power around the optical axis AX and a convex surface facing the object side, and a periphery of the optical axis AX. A biconvex fourth lens L4 having positive refractive power, a substantially concave fifth lens L5 having negative refractive power around the optical axis AX and having a concave surface facing the object side, and positive around the optical axis AX A biconvex sixth lens L6 having a refractive power of 5 and a meniscus seventh lens L7 having a negative refractive power around the optical axis AX and a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed on the object side of the outer edge of the first lens L1, and a light-shielding stop FS is disposed between the third and fourth lenses L3 and L4.

  28 (A) to 28 (C) show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 22 of Example 12, and FIGS. 28 (D) and 28 (E) show the results. 10 shows lateral aberrations of the imaging lens 22 of Example 12. FIG.

Example 13
The lens surface data of Example 13 is shown in Table 37 below.
[Table 37]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.700
2 * 3.0000 0.3006 1.54470 56 2.625
3 * -29.8652 0.0500 2.517
4 * 52.0943 0.7384 1.54470 56 2.537
5 * -7.7991 0.1000 2.357
STO INFINITY -0.0500 2.258
7 * 1.7513 0.1500 1.63469 23.9 2.203
8 * 1.1130 0.3881 2.204
9 FS INFINITY 0.0700 2.220
10 * 8.5883 0.5707 1.54470 56 2.478
11 * -5.9776 0.1525 2.652
12 * -10.6927 0.3030 1.63469 23.9 2.807
13 * 17.6055 0.3879 3.158
14 * 3.2081 0.5334 1.54470 56 3.536
15 * -3.1457 0.5565 3.879
16 * -88.2601 0.3275 1.54470 56 4.705
17 * 1.4022 0.3000 5.313
18 INFINITY 0.1100 1.51633 64.1 5.646
19 INFINITY 0.3114

The aspherical coefficients of the lens surfaces of Example 13 are shown in Table 38 below.
[Table 38]
Second side
K = 2.11148e + 000, A4 = -2.95136e-002, A6 = 3.41717e-004,
A8 = 1.75787e-002, A10 = -5.43560e-003, A12 = 2.86848e-003,
A14 = -1.08971e-003
Third side
K = 0.00000e + 000, A4 = 5.74093e-002, A6 = 1.42162e-002,
A8 = 6.36900e-003, A10 = 3.22404e-003
4th page
K = 0.00000e + 000, A4 = 1.03021e-001, A6 = -1.42099e-002,
A8 = 7.97392e-003, A10 = -2.03644e-003, A12 = -1.30793e-003,
A14 = 1.07559e-003
5th page
K = 5.54924e + 000, A4 = 1.36177e-001, A6 = -1.73239e-001,
A8 = 1.46216e-001, A10 = -8.23902e-002, A12 = 2.76774e-002,
A14 = -4.86281e-003
7th page
K = -1.59241e + 001, A4 = -9.35509e-003, A6 = -5.26647e-002,
A8 = 3.17607e-002, A10 = -1.46649e-002, A12 = 6.11984e-003,
A14 = -3.54185e-003
8th page
K = -6.33742e + 000, A3 = -1.03631e-004, A4 = -2.05910e-002,
A5 = 2.44461e-003, A6 = 5.53165e-002, A8 = -1.41665e-001,
A10 = 1.68385e-001, A12 = -1.04094e-001, A14 = 2.61596e-002
10th page
K = 3.16638e + 001, A3 = -2.05322e-002, A4 = 7.70636e-002,
A5 = -2.31548e-001, A6 = 2.25677e-001, A8 = -1.68054e-001,
A10 = 1.33867e-001, A12 = -8.05820e-002, A14 = 2.16353e-002
11th page
K = -7.04758e + 000, A3 = 2.11213e-002, A4 = -1.65440e-001,
A5 = 9.70462e-002, A6 = -5.78489e-002, A8 = 2.33043e-002,
A10 = -9.33734e-003, A12 = 7.06252e-004
12th page
K = 5.61667e + 001, A3 = 7.53586e-002, A4 = -4.84332e-001,
A5 = 4.17171e-001, A6 = -1.98178e-001, A8 = 1.00749e-001,
A10 = -2.87920e-002, A12 = 1.60783e-003
Side 13
K = -5.95526e + 001, A3 = 5.00362e-002, A4 = -3.74655e-001,
A5 = 1.89754e-001, A6 = -1.88143e-003, A8 = 4.26196e-003,
A10 = 9.01876e-004, A12 = -1.34422e-003, A14 = 2.14891e-005
14th page
K = -3.79129e + 000, A3 = 1.28434e-003, A4 = 1.60638e-002,
A5 = -1.04100e-001, A6 = 6.97150e-002, A8 = -3.46793e-002,
A10 = 1.38857e-002, A12 = -2.90033e-003, A14 = 2.33414e-004
15th page
K = -1.78695e + 000, A3 = -6.95183e-003, A4 = 1.02116e-001,
A5 = -3.11562e-002, A6 = -3.29689e-002, A8 = -6.06059e-003,
A10 = 7.19149e-003, A12 = -1.27079e-003, A14 = 5.41600e-005
16th page
K = 8.00000e + 001, A3 = -5.30569e-002, A4 = -2.41895e-001,
A5 = 8.00129e-002, A6 = 3.81682e-002, A8 = -5.01910e-003,
A10 = -6.00123e-004, A12 = 1.46593e-004, A14 = -7.72897e-006
17th page
K = -3.27599e + 000, A3 = -7.07506e-002, A4 = -1.74522e-001,
A5 = 1.43329e-001, A6 = -3.06257e-002, A8 = 1.78898e-005,
A10 = -9.87526e-005, A12 = 2.07509e-005, A14 = -7.30726e-007

The characteristics of the imaging lens of Example 13 are listed below.
FL 3.746
Fno 1.43
w 75.42
Ymax 2.921
BF 0.721
TL 5.300
BFa 0.684
TLa 5.263

The single lens data of Example 13 is shown in Table 39 below.
[Table 39]
Elem Surfs Focal Length Diameter
1 2- 3 5.0211 2.625
2 4--5 12.5080 2.537
3 7-8 -5.2952 2.204
4 10-11 6.5611 2.652
5 12-13 -10.4379 3.158
6 14-15 3.0049 3.879
7 16-17 -2.5307 5.313

  FIG. 29 is a cross-sectional view of the imaging lens 23 and the like of the thirteenth embodiment. The imaging lens 23 has, in order from the object side, a substantially convex first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and a positive refractive power around the optical axis AX. A substantially plano-convex second lens L2 having a loose convex surface facing the object side, a meniscus third lens L3 having a negative refractive power around the optical axis AX and a convex surface facing the object side, and the periphery of the optical axis AX And a biconvex fourth lens L4 having a positive refractive power, a biconcave fifth lens L5 having a negative refractive power around the optical axis AX, and a biconvex having a positive refractive power around the optical axis AX. A sixth lens L6 and a substantially plano-concave seventh lens L7 having a negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2 and L3, and between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4. A light-shielding stop FS is disposed.

  30A to 30C show various aberration diagrams (spherical aberration, astigmatism, distortion aberration) of the imaging lens 23 of Example 13, and FIGS. 30D and 30E show the results. The lateral aberration of the imaging lens 23 of Example 13 is shown.

Example 14
The lens surface data of Example 14 is shown in Table 40 below.
[Table 40]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.700
2 * 2.6382 0.3151 1.54470 56 2.625
3 * 13.0451 0.0500 2.560
4 * 4.1532 0.6042 1.54470 56 2.565
5 * -24.1768 0.1000 2.447
STO INFINITY -0.0500 2.343
7 * 1.7267 0.1554 1.64250 22.5 2.235
8 * 1.1061 0.4257 2.003
9 FS INFINITY 0.1500 2.080
10 * 10.8150 0.4020 1.54470 56 2.299
11 * -17.4966 0.1725 2.560
12 * -13.0397 0.2500 1.64250 22.5 2.833
13 * -24.3648 0.3079 3.096
14 * 7.5523 0.4919 1.54470 56 3.395
15 * -2.1375 0.2544 3.795
16 * 3.0841 0.3093 1.54470 56 4.618
17 * 0.9108 0.7000 5.004
18 INFINITY 0.1100 1.51633 64.1 5.757
19 INFINITY 0.1009

Table 41 below shows the aspheric coefficients of the lens surfaces of Example 14.
[Table 41]
Second side
K = 2.03116e + 000, A4 = -6.56064e-002, A6 = -9.47667e-003,
A8 = 1.29845e-002, A10 = -7.34348e-003, A12 = 5.03976e-003,
A14 = -1.49643e-003
Third side
K = 0.00000e + 000, A4 = 1.62399e-002, A6 = -2.17529e-002,
A8 = 1.59065e-002, A10 = 2.76162e-004
4th page
K = 0.00000e + 000, A4 = 1.16481e-001, A6 = -4.19262e-002,
A8 = 1.62885e-002, A10 = 3.62132e-004, A12 = -3.16641e-003,
A14 = 1.15655e-003
5th page
K = 8.00000e + 001, A4 = 1.15928e-001, A6 = -1.58272e-001,
A8 = 1.18731e-001, A10 = -6.70291e-002, A12 = 2.67578e-002,
A14 = -4.86297e-003
7th page
K = -1.36106e + 001, A4 = -3.54561e-002, A6 = -4.45993e-002,
A8 = 5.44551e-002, A10 = -2.50577e-002, A12 = 1.13259e-002,
A14 = -3.54209e-003
8th page
K = -5.67795e + 000, A3 = 6.93725e-003, A4 = -2.87158e-002,
A5 = 9.76236e-003, A6 = 7.14634e-002, A8 = -1.22123e-001,
A10 = 1.67693e-001, A12 = -1.06336e-001, A14 = 2.79996e-002
10th page
K = 2.01392e + 001, A3 = -2.21876e-002, A4 = 6.94020e-002,
A5 = -2.49838e-001, A6 = 2.42710e-001, A8 = -1.73201e-001,
A10 = 1.32080e-001, A12 = -7.56022e-002, A14 = 1.88769e-002
11th page
K = -8.00000e + 001, A3 = 3.74533e-002, A4 = -1.82862e-001,
A5 = 1.09505e-001, A6 = -6.57678e-002, A8 = 2.57443e-002,
A10 = -1.46604e-002, A12 = 2.96350e-003
12th page
K = 7.84932e + 001, A3 = 1.18753e-001, A4 = -4.75527e-001,
A5 = 4.01828e-001, A6 = -2.26950e-001, A8 = 1.02720e-001,
A10 = -1.77362e-002, A12 = -2.10829e-003
Side 13
K = -7.85381e + 001, A3 = 9.13893e-002, A4 = -3.34887e-001,
A5 = 1.27675e-001, A6 = -1.43744e-002, A8 = 2.16811e-002,
A10 = 2.17996e-003, A12 = -2.93847e-003, A14 = 1.39523e-005
14th page
K = 1.75964e + 001, A3 = 1.86480e-002, A4 = 2.60090e-002,
A5 = -1.07705e-001, A6 = 4.43507e-002, A8 = -2.90545e-002,
A10 = 1.63260e-002, A12 = -4.67132e-003, A14 = 5.24325e-004
15th page
K = -8.96742e + 000, A3 = -1.02219e-001, A4 = 1.95108e-001,
A5 = -7.87731e-002, A6 = -3.64803e-002, A8 = 1.32953e-003,
A10 = 6.95241e-003, A12 = -1.74240e-003, A14 = 1.25095e-004
16th page
K = -7.99995e + 001, A3 = -2.00086e-001, A4 = -1.29172e-001,
A5 = 7.80963e-002, A6 = 2.75812e-002, A8 = -5.40552e-003,
A10 = -4.50625e-004, A12 = 1.45536e-004, A14 = -8.37510e-006
17th page
K = -5.18659e + 000, A3 = -1.42142e-001, A4 = -5.81749e-002,
A5 = 1.01091e-001, A6 = -3.31283e-002, A8 = 7.74213e-004,
A10 = -9.90054e-005, A12 = 1.39436e-005, A14 = 2.40490e-007

The characteristics of the imaging lens of Example 14 are listed below.
FL 3.786
Fno 1.44
w 74.37
Ymax 2.921
BF 0.911
TL 4.849
BFa 0.873
TLa 4.812

The single lens data of Example 14 is shown in Table 42 below.
[Table 42]
Elem Surfs Focal Length Diameter
1 2- 3 6.0072 2.625
2 4- 5 6.5563 2.565
3 7-8 -5.3095 2.235
4 10-11 12.3321 2.560
5 12-13 -44.0432 3.096
6 14-15 3.1143 3.795
7 16-17 -2.4981 5.004

  FIG. 31 is a cross-sectional view of the imaging lens 24 and the like of the fourteenth embodiment. The imaging lens 24 includes, in order from the object side, a meniscus first lens L1 having a positive refractive power around the optical axis AX and a convex surface facing the object side, and an object having a positive refractive power around the optical axis AX. A substantially convex second lens L2 having a convex surface facing the side, a meniscus third lens L3 having a negative refractive power around the optical axis AX and a convex surface facing the object side, and positive around the optical axis AX A biconvex fourth lens L4 having refractive power, a substantially concave fifth lens L5 having a weak negative refractive power around the optical axis AX and having a concave surface facing the object side, and positive around the optical axis AX A biconvex sixth lens L6 having a refractive power and a meniscus seventh lens L7 having a negative refractive power around the optical axis AX and having a concave surface facing the image side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed between the second and third lenses L2 and L3, and between the object side of the outer edge of the first lens L1 and between the third and fourth lenses L3 and L4. A light-shielding stop FS is disposed.

  32A to 32C show various aberration diagrams (spherical aberration, astigmatism, distortion aberration) of the imaging lens 24 of Example 14, and FIGS. 32D and 32E show the results. The lateral aberration of the imaging lens 24 of Example 14 is shown.

Example 15
The lens surface data of Example 15 is shown in Table 43 below.
[Table 43]
Surface number rd nd vd eff.dia.
STO INFINITY 0.0000 2.625
2 * 12.7631 0.2435 1.54470 56 2.625
3 * -5.4843 0.0500 2.574
4 * 9.0345 0.5529 1.54470 56 2.650
5 * -12.5803 0.0500 2.597
6 * 1.3123 0.1512 1.63469 23.9 2.362
7 * 0.9809 0.4167 2.281
8 FS INFINITY 0.0500 2.340
9 * 7.7483 0.5607 1.54470 56 2.403
10 * -6.9181 0.1807 2.621
11 * -12.6546 0.2029 1.63469 23.9 2.826
12 * 7.7098 0.2989 3.080
13 * 3.2773 0.7704 1.54470 56 3.394
14 * -2.7895 0.3447 3.860
15 * 1.6964 0.3174 1.54470 56 4.780
16 * 0.8038 0.7000 5.268
17 INFINITY 0.1100 1.51633 64.1 5.753
18 INFINITY 0.1000

Table 44 below shows the aspheric coefficients of the lens surfaces of Example 15.
[Table 44]
Second side
K = -8.00000e + 001, A4 = -7.48850e-002, A6 = 6.33439e-002,
A8 = 6.15877e-003, A10 = -1.76732e-002, A12 = 7.02102e-003,
A14 = -1.09000e-003
Third side
K = 0.00000e + 000, A4 = 4.85267e-002, A6 = 8.42381e-003,
A8 = 1.31801e-002, A10 = -4.45043e-003
4th page
K = 0.00000e + 000, A4 = 1.55158e-001, A6 = -8.42838e-002,
A8 = 2.37956e-002, A10 = 4.07474e-003, A12 = -4.23186e-003,
A14 = 7.28622e-004
5th page
K = 3.67867e + 001, A4 = 9.08050e-002, A6 = -1.45772e-001,
A8 = 1.28885e-001, A10 = -7.77015e-002, A12 = 2.89308e-002,
A14 = -4.86280e-003
6th page
K = -6.97649e + 000, A4 = 1.05634e-002, A6 = -1.00130e-001,
A8 = 5.43288e-002, A10 = -1.85670e-002, A12 = 9.55016e-003,
A14 = -3.54185e-003
7th page
K = -3.94862e + 000, A3 = -2.59698e-003, A4 = -2.62087e-002,
A5 = 6.06741e-003, A6 = 5.23030e-002, A8 = -1.57099e-001,
A10 = 1.72952e-001, A12 = -9.17431e-002, A14 = 1.92141e-002
9th page
K = 3.66418e + 001, A3 = -1.45238e-002, A4 = 7.28277e-002,
A5 = -2.43294e-001, A6 = 2.47363e-001, A8 = -1.77780e-001,
A10 = 1.33870e-001, A12 = -7.54842e-002, A14 = 1.58978e-002
10th page
K = -6.20010e + 001, A3 = 5.12275e-002, A4 = -1.72624e-001,
A5 = 9.19663e-002, A6 = -6.96915e-002, A8 = 2.91927e-002,
A10 = -1.07735e-002, A12 = 2.59681e-004
11th page
K = 7.72015e + 001, A3 = 1.13745e-001, A4 = -4.78981e-001,
A5 = 3.97688e-001, A6 = -2.10616e-001, A8 = 1.05312e-001,
A10 = -2.45212e-002, A12 = 3.26595e-004
12th page
K = 2.18339e + 001, A3 = 5.27999e-002, A4 = -3.67919e-001,
A5 = 1.73977e-001, A6 = -9.16990e-003, A8 = 1.33268e-002,
A10 = 2.47047e-003, A12 = -2.98596e-003, A14 = 1.55616e-004
Side 13
K = 2.33931e + 000, A3 = -2.71900e-002, A4 = 2.93736e-002,
A5 = -1.34640e-001, A6 = 8.36348e-002, A8 = -3.59132e-002,
A10 = 1.47597e-002, A12 = -3.49934e-003, A14 = 3.03570e-004
14th page
K = -1.34903e + 001, A3 = -9.56336e-002, A4 = 8.04709e-002,
A5 = 3.58988e-003, A6 = -3.11515e-002, A8 = -6.77177e-003,
A10 = 7.14834e-003, A12 = -1.42848e-003, A14 = 8.21393e-005
15th page
K = -1.35283e + 001, A3 = -2.18794e-001, A4 = -1.36817e-001,
A5 = 7.20456e-002, A6 = 3.00213e-002, A8 = -4.72429e-003,
A10 = -4.67307e-004, A12 = 1.25999e-004, A14 = -6.74112e-006
16th page
K = -4.17944e + 000, A3 = -1.21792e-001, A4 = -8.51573e-002,
A5 = 1.12526e-001, A6 = -3.48332e-002, A8 = 1.48839e-003,
A10 = -1.36324e-004, A12 = 7.15732e-006, A14 = 3.36690e-007

The characteristics of the imaging lens of Example 15 are listed below.
FL 3.474
Fno 1.32
w 79.98
Ymax 2.921
BF 0.910
TL 5.100
BFa 0.873
TLa 5.063

The single lens data of Example 15 is shown in Table 45 below.
[Table 45]
Elem Surfs Focal Length Diameter
1 2- 3 7.0756 2.625
2 4- 5 9.7414 2.650
3 6- 7 -7.4386 2.362
4 9-10 6.8015 2.621
5 11-12 -7.5194 3.080
6 13-14 2.8962 3.860
7 15-16 -3.2066 5.268

  FIG. 33 is a cross-sectional view of the imaging lens 25 and the like of the fifteenth embodiment. The imaging lens 25 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, a biconvex second lens L2 having a positive refractive power around the optical axis AX, A meniscus third lens L3 having a negative refractive power around the optical axis AX and having a convex surface facing the object side, a biconvex fourth lens L4 having a positive refractive power around the optical axis AX, and the optical axis AX Bi-concave fifth lens L5 having negative refractive power around the periphery, biconvex sixth lens L6 having positive refractive power around the optical axis AX, and an image having negative refractive power around the optical axis AX And a meniscus seventh lens L7 having a concave surface on the side. All the lenses L1 to L7 are made of a plastic material. An aperture stop (STO) AS is disposed on the object side of the outer edge of the first lens L1, and a light-shielding stop FS is disposed between the third and fourth lenses L3 and L4.

  34A to 34C show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 25 of Example 15, and FIGS. 34D and 34E show the aberrations of Example 15. FIG. The lateral aberration of the imaging lens 25 is shown.

Example 16
The lens surface data of Example 16 is shown in Table 46 below.
[Table 46]
Surface number rd nd vd eff.dia.
1 FS INFINITY 0.0000 2.740
2 * 1.8993 0.7256 1.54470 56 2.627
3 * -10.3468 0.1000 2.485
STO INFINITY -0.0500 2.412
5 * 2.3319 0.1500 1.63469 23.9 2.290
6 * 1.2505 0.4048 2.059
7 FS INFINITY 0.1500 2.100
8 * 15.3914 0.4247 1.54470 56 2.214
9 * 25.1274 0.1331 2.496
10 * 2.5185 0.2088 1.63469 23.9 2.799
11 * 2.3168 0.3339 3.034
12 * 9.5172 0.8615 1.54470 56 3.378
13 * -1.2930 0.2838 3.826
14 * 25.1583 0.3216 1.54470 56 4.991
15 * 1.0816 0.5000 5.288
16 INFINITY 0.1100 1.51633 64.1 5.601
17 INFINITY 0.3020

The aspheric coefficient of the lens surface of Example 16 is shown in Table 47 below.
[Table 47]
Second side
K = -2.39449e-002, A4 = 5.58481e-003, A6 = 2.06612e-003,
A8 = -3.07646e-003, A10 = 5.65811e-003, A12 = -3.14644e-003,
A14 = 8.16023e-004
Third side
K = -8.00000e + 001, A4 = 1.05929e-001, A6 = -1.20368e-001,
A8 = 1.14068e-001, A10 = -7.43080e-002, A12 = 2.86019e-002,
A14 = -4.86279e-003
5th page
K = -2.91189e + 001, A4 = 3.95298e-002, A6 = -4.85696e-002,
A8 = 5.37086e-002, A10 = -4.45093e-002, A12 = 1.91345e-002,
A14 = -3.54000e-003
6th page
K = -6.16593e + 000, A3 = -1.36116e-002, A4 = 2.41257e-002,
A5 = 2.21024e-002, A6 = 6.61235e-002, A8 = -1.47064e-001,
A10 = 1.68672e-001, A12 = -1.05597e-001, A14 = 2.90830e-002
8th page
K = 4.90837e + 001, A3 = -2.20527e-002, A4 = 6.40051e-002,
A5 = -2.18089e-001, A6 = 1.96471e-001, A8 = -1.69893e-001,
A10 = 1.59744e-001, A12 = -1.02202e-001, A14 = 2.22018e-002
9th page
K = 8.00000e + 001, A3 = -5.97772e-002, A4 = -1.15158e-001,
A5 = 1.07951e-001, A6 = -1.05467e-001, A8 = 3.87722e-002,
A10 = -1.03260e-002, A12 = -2.82006e-003
10th page
K = -1.27547e + 001, A3 = -6.15540e-002, A4 = -3.57831e-001,
A5 = 3.62974e-001, A6 = -2.66449e-001, A8 = 1.14702e-001,
A10 = -1.51594e-002, A12 = -2.23672e-003
11th page
K = -7.28835e + 000, A3 = -4.88579e-002, A4 = -2.61960e-001,
A5 = 1.53657e-001, A6 = -4.20626e-002, A8 = 6.17673e-003,
A10 = 6.76305e-003, A12 = -1.70706e-003, A14 = -5.89432e-005
12th page
K = -8.00000e + 001, A3 = -3.96204e-002, A4 = 7.90492e-002,
A5 = -1.36173e-001, A6 = 8.32349e-002, A8 = -3.73885e-002,
A10 = 1.63306e-002, A12 = -4.12975e-003, A14 = 4.64192e-004
Side 13
K = -9.52678e + 000, A3 = -1.28867e-001, A4 = -2.44286e-002,
A5 = 8.56721e-002, A6 = -1.81894e-002, A8 = -1.49643e-002,
A10 = 7.02380e-003, A12 = -1.18173e-003, A14 = 5.59535e-005
14th page
K = 8.00000e + 001, A3 = -1.20707e-001, A4 = -8.63150e-002,
A5 = 3.37030e-002, A6 = 2.20851e-002, A8 = -2.50638e-003,
A10 = -3.30695e-004, A12 = 7.19533e-005, A14 = -3.53817e-006
15th page
K = -7.05628e + 000, A3 = 1.57420e-002, A4 = -1.56593e-001,
A5 = 1.11464e-001, A6 = -2.93837e-002, A8 = 1.42233e-003,
A10 = -2.26203e-004, A12 = 3.07229e-005, A14 = -1.35985e-006

The characteristics of the imaging lens of Example 16 are listed below.
FL 3.786
Fno 1.44
w 75.45
Ymax 2.921
BF 0.912
TL 4.960
BFa 0.875
TLa 4.922

Single lens data of Example 16 is shown in Table 48 below.
[Table 48]
Elem Surfs Focal Length Diameter
1 2- 3 3.0089 2.627
2 5- 6 -4.4904 2.290
3 8- 9 71.8223 2.496
4 10-11 -76.2331 3.034
5 12-13 2.1503 3.826
6 14-15 -2.0848 5.288

  FIG. 35 is a sectional view of the imaging lens 26 and the like of the sixteenth embodiment. The imaging lens 26 includes, in order from the object side, a biconvex first lens L1 having a positive refractive power around the optical axis AX, and a meniscus having a negative refractive power around the optical axis AX and a convex surface facing the object side. The second lens L2, the third lens L3 having a generally positive convexity having a weak positive refractive power around the optical axis AX and a convex surface facing the object side, and a weak negative refractive power around the optical axis AX. A fourth meniscus lens L4 having a convex surface facing the object side, a biconvex fifth lens L5 having a positive refractive power around the optical axis AX, and a negative refractive power around the optical axis AX and having a negative refractive power on the image side And a substantially plano-concave sixth lens L6 having a concave surface. All the lenses L1 to L6 are made of a plastic material. An aperture stop (STO) AS is disposed between the first and second lenses L1 and L2, and between the object side of the outer edge of the first lens L1 and between the second and third lenses L2 and L3, A light-shielding stop FS is disposed.

  36 (A) to 36 (C) show various aberration diagrams (spherical aberration, astigmatism, distortion) of the imaging lens 26 of Example 16, and FIGS. 36 (D) and 36 (E) show the examples. 10 shows lateral aberrations of the imaging lens 26 of Example 16. FIG.

For reference, Table 49 below summarizes the values of Examples 1 to 16 corresponding to the conditional expressions (1) and (3) to (6).
[Table 49]

  In the above, the present invention has been described based on the embodiments and examples, but the present invention is not limited to the above-described embodiments and the like. For example, the aperture stop AS can be directly supported by the lens barrel portion 54a, but can be fixed to a flange portion extending to the outside of one adjacent lens, or the outside of a pair of adjacent lenses. And can be fixed by being sandwiched between flange portions extending in the direction. Although the light-shielding stop FS can also be directly supported by the lens barrel portion 54a, it can be fixed to a flange portion that extends to the outside of one adjacent lens, or extends to the outside of a pair of adjacent lenses. It can be fixed by being sandwiched between flange portions.

  The aperture stop AS and the light-shielding stop FS are not limited to metal plates, but can be plate members made of resin or ceramics, and can also be incorporated by painting the flange portion of the lens with a light-shielding material. Further, the aperture stop AS and the light-shielding stop FS are not limited to a complete light-shielding body, and may be one that performs light reduction outside the aperture. When the light-shielding stop FS is a light-shielding plate or the like, a plurality of light-shielding plates or the like can be arranged between a pair of lenses.

  DESCRIPTION OF SYMBOLS 10, 11-26 ... Imaging lens, 50 ... Camera module, 51 ... Imaging device, 100 ... Imaging device, 300 ... Portable communication terminal, AX ... Optical axis, L1-L7 ... Lens, AS, FS ... Aperture

Claims (10)

It consists of 6 to 8 lenses,
The image side surface of the lens arranged closest to the image side is aspheric and has an extreme value within an effective diameter other than the center,
The first lens, the second lens, and the third lens that are continuously arranged from the most object side include at least one positive lens and at least one negative lens.
Among the first, second and third lenses, the positive lens with the highest power is the main positive lens, the negative lens with the highest power is the main negative lens,
A first diaphragm member having a predetermined first opening is disposed on the object side of the first lens,
A second diaphragm member having a predetermined second opening is disposed between the main negative lens and the adjacent lens;
The image side surface of the main negative lens is a concave surface, the surface having the smallest effective diameter in the entire system,
An imaging lens that satisfies the following conditional expression.
1.5 <Dn / s1 <2.3 (1)
s1 ≧ s2 (2)
1.53 ≦ f123 / f <4.0 (5)
Dn: distance from the image side surface of the main negative lens to the imaging surface s1: aperture diameter of the first aperture member s2: the aperture diameter of the second aperture member, and when there are a plurality of aperture members that can be regarded as second aperture members Small opening diameter
f123: Composite focal length from the first lens to the third lens
f: Focal length of the entire system   The imaging lens according to claim 1, wherein the most image side lens is a negative lens.   The imaging lens according to claim 2, further comprising an aperture stop closer to the object side than the fourth lens. The imaging lens according to claim 1, which satisfies the following conditional expression.
1.0 ≦ Φmax / EPD <1.25 (3)
Φmax: effective diameter of the lens having the largest effective diameter among the first lens to the third lens EPD: entrance pupil diameter The imaging lens according to claim 1, which satisfies the following conditional expression.
0.70 <s2 / s1 ≦ 1.0 (4) The main negative lens three lenses arranged in succession on the image side of, satisfies the following conditional expression, respectively, the imaging lens according to any one of claims 1-5.
0.01 <SAG_A / ΦA <0.20 (6)
SAG_A: Sag amount within the effective diameter of the object side surface ΦA: Effective diameter of the object side surface The main negative lens, the main positive lens disposed on the image side of the immediately following, the imaging lens according to any one of claims 1-6. Substantially further comprising an optical element having no power, the imaging lens according to any one of claims 1-7. To any one of claims 1-8 comprising the imaging lens according, and the imaging device, the imaging device. A portable terminal comprising the imaging device according to claim 9 .

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