CN109581632B - Optical lens assembly and image capturing device - Google Patents
Optical lens assembly and image capturing device Download PDFInfo
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- CN109581632B CN109581632B CN201910063932.3A CN201910063932A CN109581632B CN 109581632 B CN109581632 B CN 109581632B CN 201910063932 A CN201910063932 A CN 201910063932A CN 109581632 B CN109581632 B CN 109581632B
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Abstract
The invention discloses an optical lens assembly and an image capturing device. The optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The first lens element with positive refractive power has an object-side surface being convex at a paraxial region thereof. The second lens element with negative refractive power has a concave image-side surface at a paraxial region. The third lens element has an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region. The fourth lens element with positive refractive power. The image side surface of the fifth lens is concave at the paraxial region. The seventh lens element has a concave image-side surface at a paraxial region thereof, and the image-side surface of the seventh lens element includes at least one convex surface at an off-axis region thereof, wherein the object-side surface and the image-side surface thereof are aspheric. When the specific conditions are satisfied, the total length of the optical lens assembly can be effectively shortened, and the miniaturization of the optical lens assembly can be maintained. The invention also discloses an image capturing device with the optical lens group.
Description
This application is a divisional application of patent applications filed on 2015, 16/04, application number 201510179218.2 entitled "optical lens assembly, image capturing device and electronic device".
Technical Field
The present invention relates to an optical lens assembly and an image capturing device, and more particularly, to a miniaturized optical lens assembly and an image capturing device applied to an electronic device.
Background
In recent years, with the rise of electronic products having a photographing function, the demand for optical systems has been increasing. The photosensitive elements of a general optical system are not limited to a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) Sensor, and with the refinement of Semiconductor process technology, the pixel size of the photosensitive elements is reduced, and the optical system gradually develops into a high pixel field, so that the requirements for imaging quality are increased.
The optical system mounted on the electronic product is usually a four-piece or five-piece lens structure, and under the prevalence of high-specification mobile devices such as Smart phones (Smart phones) and Portable devices (Portable devices), the optical system is developed towards a direction of large imaging area and small size, and the imaging device thereof is also correspondingly miniaturized. However, the conventional optical system is difficult to be mounted on a thin and light electronic device because it is difficult to satisfy both the requirements of a large aperture and a short overall length.
At present, although six-piece optical systems are developed, the product is designed toward large aperture and miniaturization, and problems of image curvature, high distortion and poor relative illumination are often generated due to poor surface configuration of the lens.
Disclosure of Invention
The invention provides an optical lens assembly and an image capturing device, wherein the surface shapes of a fifth lens element and a seventh lens element are configured, so that the optical lens assembly is favorable for having the characteristics of large aperture and short total length, and is suitable for being applied to light and thin electronic devices.
According to the present invention, an optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The first lens element with positive refractive power has an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region. The second lens element with negative refractive power has a concave image-side surface at a paraxial region. The third lens element has an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region. The fourth lens element with positive refractive power. The fifth lens element with negative refractive power has a concave image-side surface at the paraxial region. The sixth lens element with positive refractive power. The seventh lens element with negative refractive power has a concave image-side surface at the paraxial region thereof, and the image-side surface of the seventh lens element includes at least one convex surface at an off-axis region thereof, wherein the object-side surface and the image-side surface thereof are aspheric. The total number of the lenses in the optical lens assembly is seven, and a distance is formed between any two adjacent lenses, the distance from the object-side surface of the first lens to the image plane on the optical axis is TL, the maximum image height of the optical lens assembly is ImgH, and the following conditions are satisfied:
TL/ImgH<1.80。
according to the present invention, an image capturing device is further provided, which includes the optical lens assembly as described in the previous paragraph and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an image plane of the optical lens assembly.
When TL/ImgH satisfies the above condition, the total length of the optical lens assembly can be effectively shortened to maintain miniaturization.
Drawings
Fig. 1 is a schematic view illustrating an image capturing apparatus according to a first embodiment of the invention;
FIG. 2 is a graph showing the spherical aberration, astigmatism and distortion of the first embodiment in order from left to right;
FIG. 3 is a schematic view illustrating an image capturing device according to a second embodiment of the present invention;
FIG. 4 is a graph showing the spherical aberration, astigmatism and distortion of the second embodiment in order from left to right;
FIG. 5 is a schematic view illustrating an image capturing apparatus according to a third embodiment of the present invention;
FIG. 6 is a graph showing the spherical aberration, astigmatism and distortion of the third embodiment in order from left to right;
FIG. 7 is a schematic view illustrating an image capturing apparatus according to a fourth embodiment of the present invention;
FIG. 8 is a graph showing the spherical aberration, astigmatism and distortion of the fourth embodiment in order from left to right;
fig. 9 is a schematic view illustrating an image capturing apparatus according to a fifth embodiment of the invention;
FIG. 10 is a graph showing the spherical aberration, astigmatism and distortion of the fifth embodiment in order from left to right;
fig. 11 is a schematic view illustrating an image capturing apparatus according to a sixth embodiment of the invention;
FIG. 12 is a graph showing spherical aberration, astigmatism and distortion curves of the sixth embodiment, in order from left to right;
FIG. 13 is a diagram illustrating the parameter Sag52 according to the first embodiment of FIG. 1;
FIG. 14 is a diagram illustrating the parameter Yc32 according to the second embodiment of FIG. 3;
FIG. 15 is a diagram illustrating the parameter Yc72 according to the second embodiment of FIG. 3;
FIG. 16 is a schematic view of an electronic device according to a seventh embodiment of the invention;
FIG. 17 is a schematic view of an electronic device according to an eighth embodiment of the invention; and
fig. 18 is a schematic view illustrating an electronic device according to a ninth embodiment of the invention.
[ notation ] to show
An electronic device: 10. 20, 30
An image taking device: 11. 21, 31
A first lens: 110. 210, 310, 410, 510, 610
An object-side surface: 111. 211, 311, 411, 511, 611
Image-side surface: 112. 212, 312, 412, 512, 612
A second lens: 120. 220, 320, 420, 520, 620
An object-side surface: 121. 221, 321, 421, 521, 621
Image-side surface: 122. 222, 322, 422, 522, 622
A third lens: 130. 230, 330, 430, 530, 630
An object-side surface: 131. 231, 331, 431, 531, 631
Image-side surface: 132. 232, 332, 432, 532, 632
A fourth lens: 140. 240, 340, 440, 540, 640
An object-side surface: 141. 241, 341, 441, 541, 641
Image-side surface: 142. 242, 342, 442, 542, 642
A fifth lens: 150. 250, 350, 450, 550, 650
An object-side surface: 151. 251, 351, 451, 551, 651
Image-side surface: 152. 252, 352, 452, 552, 652
A sixth lens: 160. 260, 360, 460, 560, 660
An object-side surface: 161. 261, 361, 461, 561, 661
Image-side surface: 162. 262, 362, 462, 562, 662
A seventh lens: 170. 270, 370, 470, 570, 670
An object-side surface: 171. 271, 371, 471, 571, 671
Image-side surface: 172. 272, 372, 472, 572, 672
Infrared ray filtering filter element: 180. 280, 380, 480, 580, 680
Imaging surface: 190. 290, 390, 490, 590, 690
An electron-sensitive element: 195. 295, 395, 495, 595 and 695
f: focal length of optical lens group
Fno: aperture value of optical lens group
HFOV: half of maximum visual angle in optical lens group
V2: abbe number of second lens
V5: abbe number of fifth lens
Sd: distance from aperture to image side surface of seventh lens on optical axis
Td: the distance from the object side surface of the first lens to the image side surface of the seventh lens on the optical axis
EPD: entrance pupil diameter of optical lens group
CT 5: thickness of the fifth lens element on the optical axis
CT 6: thickness of the sixth lens element on the optical axis
CT 7: thickness of the seventh lens element on the optical axis
Sigma CT: the sum of thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens on the optical axis
TL: the distance from the object side surface of the first lens element to the image plane on the optical axis
ImgH: maximum image height of optical lens group
Sag 52: the horizontal displacement from the intersection point of the image side surface of the fifth lens on the optical axis to the maximum effective radius position of the image side surface of the fifth lens on the optical axis
Yc 32: the vertical distance between the critical point of the image side surface of the third lens and the optical axis
Yc 72: the vertical distance between the critical point of the image-side surface of the seventh lens element and the optical axis
R11: radius of curvature of object-side surface of sixth lens element
R13: radius of curvature of object-side surface of seventh lens
R14: radius of curvature of image-side surface of seventh lens
f 345: the combined focal length of the third lens, the fourth lens and the fifth lens
Detailed Description
An optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein the optical lens assembly includes seven lens elements with refractive power.
Any two adjacent lenses with refractive power in the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element of the optical lens assembly of the front section have a spacing distance therebetween; that is, the optical lens group has seven single non-cemented lenses. Since the process of bonding the lens is more complicated than that of non-bonding lens, especially the bonding surface of the two lenses needs to have a curved surface with high accuracy so as to achieve high degree of adhesion when the two lenses are bonded, and the poor degree of adhesion caused by deviation may occur during the bonding process, which affects the overall optical imaging quality. Therefore, in the optical lens assembly of the present invention, a distance is formed between any two adjacent lenses with refractive power, so as to effectively improve the problem caused by lens adhesion.
The first lens element with positive refractive power has an object-side surface being convex at a paraxial region thereof, so as to adjust the positive refractive power of the first lens element properly, thereby reducing the total track length of the optical lens assembly.
The image-side surface of the third lens element can be concave at the paraxial region thereof and can include at least one convex surface at the off-axis region thereof for correcting aberrations in the off-axis field.
The object-side surface of the fourth lens element can be convex at a position close to the optical axis, so as to correct spherical aberration and effectively improve imaging quality.
The image-side surface of the fifth lens element is concave at the paraxial region thereof, thereby optimizing the lens shape design to facilitate an enlarged field of view and aperture.
The sixth lens element has an object-side surface that is concave at a paraxial region thereof and an image-side surface that is convex at a paraxial region thereof, thereby effectively correcting astigmatism to improve image quality.
The image side surface of the seventh lens element is concave at the paraxial region thereof, and the image side surface of the seventh lens element comprises at least one convex surface at the off-axis region thereof, thereby effectively suppressing the angle of light incident on the electronic photosensitive element, so that the optical lens assembly can be more sensitively induced and has the effects of improving the peripheral image quality and the relative illumination.
The sixth lens element has a radius of curvature of the object-side surface R11 and a focal length f, satisfying the following condition: r11/f <0. Therefore, in the optical lens group with both large aperture and miniaturization, the image curvature is effectively reduced, the appropriate relative illumination is provided, and the configuration of the lens surface shape is facilitated.
An axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is Td, and a total thickness of the first, second, third, fourth, fifth, sixth, and seventh lens elements is Σ CT, which satisfies the following condition: 1.0< Td/Σ CT < 1.45. Therefore, the tightness between the lenses can be ensured, and the difficulty in assembly caused by overlarge spacing distance between the lenses is avoided.
The second lens has an abbe number of V2 and the fifth lens has an abbe number of V5, which satisfy the following conditions: 30< V2+ V5< 85. Therefore, the imaging quality can be effectively improved through the negative refractive power configuration of the second lens and the fifth lens.
The curvature radius of the image-side surface of the seventh lens element is R14, and the focal length of the optical lens assembly is f, which satisfies the following conditions: 0< R14/f < 0.60. Therefore, the main point of the optical lens group can be far away from the image side of the optical lens group, and the back focal length can be shortened to keep miniaturization.
The focal length of the optical lens assembly is f, and the combined focal length of the third lens element, the fourth lens element and the fifth lens element is f345, which satisfies the following conditions: 0< f/f345< 1.0. Therefore, the surface shape changes of the third lens, the fourth lens and the fifth lens can be relatively mild, which is beneficial to the formation and assembly of the optical lens group and the configuration with lower sensitivity and suitable for imaging.
A horizontal displacement amount, which is Sag52, of an intersection point of the image-side surface of the fifth lens element on the optical axis to a maximum effective radius position of the image-side surface of the fifth lens element on the optical axis, and a thickness of the fifth lens element on the optical axis is CT5, which satisfies the following conditions: | Sag52|/CT5< 0.55. Therefore, the shape of the lens can not be excessively bent, and the optical lens group is more closely configured besides being beneficial to manufacturing and molding the lens. Preferably, the following conditions are satisfied: | Sag52|/CT5< 0.50.
The thickness of the sixth lens element along the optical axis is CT6, and the thickness of the seventh lens element along the optical axis is CT7, which satisfies the following conditions: CT6/CT7< 2.50. Therefore, the situation that the lens structure is weak due to the fact that the center of the sixth lens is too thick or the seventh lens is too thin can be avoided, and the assembling difficulty is reduced.
The optical lens assembly may further include an aperture stop disposed between the object and the third lens element, wherein an axial distance from the aperture stop to the image-side surface of the seventh lens element is Sd, and an axial distance from the object-side surface of the first lens element to the image-side surface of the seventh lens element is Td, and the following requirements are satisfied: 0.80< Sd/Td < 1.0. Therefore, the optical lens group can obtain good balance in telecentricity and wide-angle characteristics, and the overall miniaturized total length is maintained.
An axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is Td, an entrance pupil diameter of the optical lens assembly is EPD, and the following conditions are satisfied: Td/EPD < 3.20. Therefore, the light-in quantity of the optical lens group can be increased, and the miniaturization of the optical lens group is maintained.
The vertical distance between the critical point of the image-side surface of the third lens element and the optical axis is Yc32, and the vertical distance between the critical point of the image-side surface of the seventh lens element and the optical axis is Yc72, which satisfies the following conditions: 0.3< Yc32/Yc72< 0.75. Therefore, the light shrinkage of the periphery of the image can be assisted, and the relative illumination and the image definition of the optical lens group can be effectively improved.
An axial distance TL (when the optical lens assembly includes a plate element, TL includes a thickness of the plate element) from the object-side surface of the first lens element to the image plane, a maximum image height of the optical lens assembly is ImgH, which satisfies the following condition: TL/ImgH < 1.80. Therefore, the total length of the optical lens assembly can be effectively shortened, and the miniaturization of the optical lens assembly is maintained.
The focal length of the optical lens group is f, the maximum image height of the optical lens group is ImgH, and the following conditions are satisfied: f/ImgH < 1.40. Therefore, the optical lens group is beneficial to enlarging the visual angle and reducing the distortion.
Half of the maximum viewing angle of the optical lens group is HFOV, which satisfies the following condition: 0.70< tan (HFOV). Therefore, the optical lens assembly has the characteristic of large visual angle so as to obtain a wide image capturing range.
A radius of curvature of the object-side surface of the seventh lens element is R13, and a radius of curvature of the image-side surface of the seventh lens element is R14, where the following conditions are satisfied: 0.30< (R13+ R14)/(R13-R14). Therefore, the back focal length can be effectively shortened, and the miniaturization can be maintained.
In the optical lens assembly provided by the present invention, the material of the lens can be plastic or glass. When the lens is made of plastic, the production cost can be effectively reduced. In addition, when the lens element is made of glass, the degree of freedom of the refractive power configuration of the optical lens assembly can be increased. In addition, the object-side surface and the image-side surface of the optical lens assembly can be Aspheric Surfaces (ASP), which can be easily made into shapes other than spherical surfaces to obtain more control variables for reducing the aberration and further reducing the number of the lenses used, thereby effectively reducing the total track length of the optical lens assembly of the present invention.
Moreover, in the optical lens assembly provided by the present invention, if the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at a position close to the optical axis; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at the paraxial region. In the optical lens assembly provided by the present invention, if the lens element has positive refractive power or negative refractive power, or the focal length of the lens element, the refractive power or the focal length of the lens element at the paraxial region thereof is referred to.
In the optical lens assembly provided by the present invention, the Critical Point (Critical Point) is a tangent Point on the lens surface, except for the intersection Point with the optical axis, which is tangent to a tangent plane perpendicular to the optical axis.
In addition, the optical lens assembly of the present invention can be provided with at least one diaphragm as required to reduce stray light and to facilitate the improvement of image quality.
The Image Surface of the optical lens assembly of the present invention may be a flat Surface or a curved Surface with any curvature, especially a curved Surface with a concave Surface facing the object side, depending on the corresponding electronic photosensitive element.
In the optical lens assembly of the present invention, the stop may be a front stop or a middle stop, wherein the front stop means that the stop is disposed between the object and the first lens element, and the middle stop means that the stop is disposed between the first lens element and the image plane. If the diaphragm is a front diaphragm, a longer distance is generated between the Exit Pupil (Exit Pupil) of the optical lens group and the imaging plane, so that the optical lens group has a Telecentric (telecentricity) effect, and the image receiving efficiency of a CCD (charge coupled device) or a CMOS (complementary metal oxide semiconductor) of the electronic photosensitive element can be increased; if the diaphragm is arranged in the middle, the system is beneficial to expanding the angle of view of the system, and the optical lens group has the advantages of a wide-angle lens.
The optical lens assembly of the invention can be applied to a mobile focusing optical system according to requirements, and has the characteristics of excellent aberration correction and good imaging quality. But also can be applied to electronic devices such as three-dimensional (3D) image acquisition, digital cameras, mobile products, digital flat panels, smart televisions, network monitoring equipment, motion sensing game machines, automobile data recorders, backing developing devices, industrial robots, wearable products and the like in many aspects.
The present invention further provides an image capturing device, comprising the optical lens assembly and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an image plane of the optical lens assembly. The surface shape configuration of the fifth lens and the seventh lens is beneficial to the characteristics of large aperture and short total length, and is suitable for being applied to light and thin electronic devices. Moreover, due to the arrangement of the curvature radius of the sixth lens element and the focal length of the optical lens assembly, the image curvature can be effectively reduced, the appropriate relative illumination can be provided, and the arrangement of the lens surface shape is facilitated in the optical lens assembly with both large aperture and miniaturization. Preferably, the image capturing device may further include a Barrel (Barrel Member), a Holder (Holder Member), or a combination thereof.
The invention provides an electronic device comprising the image capturing device. Thereby, a larger viewing angle can be achieved. Preferably, the electronic device may further include a Control Unit (Control Unit), a Display Unit (Display), a Storage Unit (Storage Unit), a Random Access Memory (RAM), or a combination thereof.
The following provides a detailed description of the embodiments with reference to the accompanying drawings.
< first embodiment >
Referring to fig. 1 and fig. 2, wherein fig. 1 is a schematic diagram of an image capturing device according to a first embodiment of the invention, and fig. 2 is a graph of spherical aberration, astigmatism and distortion of the first embodiment in order from left to right. As shown in fig. 1, the image capturing device of the first embodiment includes an optical lens assembly (not numbered) and an electronic photosensitive element 195. The optical lens assembly includes, in order from an object side to an image side, an aperture stop 100, a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, a seventh lens element 170, an IR-cut filter element (IR-cut filter)180 and an image plane 190, and an electro-optic sensor 195 is disposed on the image plane 190 of the optical lens assembly, wherein the optical lens assembly includes seven lens elements (110 and 170), and a distance is provided between any two adjacent lens elements with refractive power.
The first lens element 110 with positive refractive power has an object-side surface 111 being convex in a paraxial region thereof and an image-side surface 112 being concave in a paraxial region thereof.
The second lens element 120 with negative refractive power has an object-side surface 121 being convex in a paraxial region thereof and an image-side surface 122 being concave in a paraxial region thereof.
The third lens element 130 with positive refractive power has an object-side surface 131 being convex in a paraxial region thereof and an image-side surface 132 being concave in a paraxial region thereof.
The fourth lens element 140 with positive refractive power has an object-side surface 141 being convex in a paraxial region thereof and an image-side surface 142 being convex in a paraxial region thereof.
The fifth lens element 150 with negative refractive power has an object-side surface 151 being concave in a paraxial region thereof and an image-side surface 152 being concave in a paraxial region thereof.
The sixth lens element 160 with positive refractive power has an object-side surface 161 being concave in a paraxial region thereof and an image-side surface 162 being convex in a paraxial region thereof.
The seventh lens element 170 with negative refractive power has an object-side surface 171 being convex in a paraxial region thereof and an image-side surface 172 being concave in a paraxial region thereof. In addition, the seventh lens element image-side surface 172 includes at least one convex surface at an off-axis position.
The ir-cut filter 180 is made of glass and disposed between the seventh lens element 170 and the image plane 190 without affecting the focal length of the optical lens assembly.
The curve equation of the aspherical surface of each lens described above is as follows:
wherein:
x: the distance between the point on the aspheric surface, which is Y from the optical axis, and the relative distance between the point and the tangent plane of the intersection point tangent to the aspheric surface optical axis;
y: the perpendicular distance between a point on the aspheric curve and the optical axis;
r: a radius of curvature;
k: the cone coefficient; and
ai: the ith order aspheric coefficients.
In the optical lens assembly of the first embodiment, the focal length of the optical lens assembly is f, the aperture value (f-number) of the optical lens assembly is Fno, and half of the maximum viewing angle in the optical lens assembly is HFOV, which has the following values: f is 5.04 mm; fno 2.30; and HFOV 38.0 degrees.
In the optical lens group of the first embodiment, half of the maximum angle of view of the optical lens group is HFOV, which satisfies the following condition: tan (hfov) ═ 0.78.
In the optical lens assembly of the first embodiment, the second lens element 120 has an abbe number of V2, and the fifth lens element 150 has an abbe number of V5, which satisfies the following conditions: v2+ V5 is 79.3.
In the optical lens assembly of the first embodiment, an axial distance between the aperture stop 100 and the seventh lens element image-side surface 172 is Sd, and an axial distance between the first lens element object-side surface 111 and the seventh lens element image-side surface 172 is Td, which satisfy the following conditions: Sd/Td is 0.95.
In the optical lens assembly of the first embodiment, an axial distance between the object-side surface 111 and the image-side surface 172 of the seventh lens element is Td, and an entrance pupil diameter of the optical lens assembly is EPD, which satisfies the following conditions: Td/EPD is 2.36.
In the optical lens assembly of the first embodiment, an axial distance between the object-side surface 111 and the image-side surface 172 of the first lens element is Td, and a total axial thickness of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160 and the seventh lens element 170 is Σ CT, which satisfies the following condition: td/Σ CT is 1.37.
In the optical lens assembly of the first embodiment, the thickness of the sixth lens element 160 on the optical axis is CT6, and the thickness of the seventh lens element 170 on the optical axis is CT7, which satisfies the following conditions: CT6/CT7 is 0.42.
In the optical lens assembly of the first embodiment, the distance from the object-side surface 111 to the image plane 190 is TL, the maximum image height of the optical lens assembly is ImgH (i.e. half of the diagonal length of the effective sensing area of the electronic photosensitive element 195), which satisfies the following conditions: TL/ImgH is 1.61.
Referring to FIG. 13, a schematic diagram of the parameter Sag52 according to the first embodiment of FIG. 1 is shown. As can be seen from fig. 13, the horizontal displacement along the optical axis from the intersection point of the image-side surface 152 of the fifth lens element to the maximum effective radial position of the image-side surface 152 of the fifth lens element is Sag52 (negative for Sag 52; positive for Sag 52; negative for Sag 52) and the thickness of the fifth lens element 150 along the optical axis is CT5, which satisfies the following condition: 0.91 | Sag52|/CT 5.
In the optical lens assembly of the first embodiment, the radius of curvature of the object-side surface 161 of the sixth lens element is R11, and the focal length of the optical lens assembly is f, which satisfies the following conditions: r11/f-19.16.
In the optical lens assembly of the first embodiment, the curvature radius of the image-side surface 172 of the seventh lens element is R14, and the focal length of the optical lens assembly is f, which satisfy the following conditions: r14/f is 0.32.
In the optical lens assembly of the first embodiment, the radius of curvature of the seventh lens object-side surface 171 is R13, and the radius of curvature of the seventh lens image-side surface 172 is R14, which satisfy the following conditions: (R13+ R14)/(R13-R14) ═ 4.89.
In the optical lens assembly of the first embodiment, the focal length of the optical lens assembly is f, and the combined focal length of the third lens element 130, the fourth lens element 140 and the fifth lens element 150 is f345, which satisfies the following conditions: f/f345 is 0.17.
In the optical lens assembly of the first embodiment, the focal length of the optical lens assembly is f, and the maximum image height of the optical lens assembly is ImgH, which satisfies the following conditions: f/ImgH is 1.26.
The following list I and list II are referred to cooperatively.
In table one, the detailed structural data of the first embodiment of fig. 1 are shown, wherein the units of the radius of curvature, the thickness and the focal length are mm, and the surfaces 0-18 sequentially represent the surfaces from the object side to the image side. Table II shows aspheric data of the first embodiment, where k represents the cone coefficients in the aspheric curve equation, and A4-A16 represents the 4 th to 16 th order aspheric coefficients of each surface. In addition, the following tables of the embodiments correspond to the schematic diagrams and aberration graphs of the embodiments, and the definitions of the data in the tables are the same as those of the first and second tables of the first embodiment, which is not repeated herein.
< second embodiment >
Referring to fig. 3 and fig. 4, wherein fig. 3 is a schematic diagram of an image capturing device according to a second embodiment of the invention, and fig. 4 is a graph of spherical aberration, astigmatism and distortion of the second embodiment in order from left to right. As shown in fig. 3, the image capturing device of the second embodiment includes an optical lens assembly (not shown) and an electronic photosensitive element 295. The optical lens assembly includes, in order from an object side to an image side, an aperture stop 200, a first lens element 210, a second lens element 220, a third lens element 230, a fourth lens element 240, a fifth lens element 250, a sixth lens element 260, a seventh lens element 270, an ir-cut filter 280 and an image plane 290, and an electro-optic sensing element 295 is disposed on the image plane 290 of the optical lens assembly, wherein the optical lens assembly includes seven lens elements (210 and 270), and a distance is provided between any two adjacent lens elements having refractive power.
The first lens element 210 with positive refractive power has an object-side surface 211 being convex in a paraxial region thereof and an image-side surface 212 being concave in a paraxial region thereof.
The second lens element 220 with positive refractive power has an object-side surface 221 being convex in a paraxial region thereof and an image-side surface 222 being concave in a paraxial region thereof.
The third lens element 230 with positive refractive power has an object-side surface 231 being convex in a paraxial region thereof and an image-side surface 232 being concave in a paraxial region thereof. In addition, the image-side surface 232 of the third lens element includes at least one convex surface at an off-axis position.
The fourth lens element 240 with positive refractive power has an object-side surface 241 being convex in a paraxial region thereof and an image-side surface 242 being convex in a paraxial region thereof.
The fifth lens element 250 with negative refractive power has an object-side surface 251 being concave in a paraxial region thereof and an image-side surface 252 being concave in a paraxial region thereof.
The sixth lens element 260 with positive refractive power has an object-side surface 261 being convex in a paraxial region thereof and an image-side surface 262 being convex in a paraxial region thereof.
The seventh lens element 270 with negative refractive power has an object-side surface 271 being concave in a paraxial region thereof and an image-side surface 272 being concave in a paraxial region thereof. In addition, the image-side surface 272 of the seventh lens element includes at least one convex surface at an off-axis position.
The ir-cut filter 280 is made of glass and disposed between the seventh lens element 270 and the image plane 290 without affecting the focal length of the optical lens assembly.
Referring to fig. 14 and 15 together, fig. 14 is a schematic diagram illustrating the parameter Yc32 according to the second embodiment of fig. 3, and fig. 15 is a schematic diagram illustrating the parameter Yc72 according to the second embodiment of fig. 3. As can be seen from fig. 14 and 15, the vertical distance between the optical axis and the critical point of the image-side surface 232 of the third lens element is Yc32, and the vertical distance between the optical axis and the critical point of the image-side surface 272 of the seventh lens element is Yc72, which satisfies the following conditions: yc32/Yc72 equals 0.54.
See also table three and table four below.
In the second embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.
The following data can be calculated by matching table three and table four:
< third embodiment >
Referring to fig. 5 and fig. 6, wherein fig. 5 is a schematic diagram of an image capturing apparatus according to a third embodiment of the present invention, and fig. 6 is a graph of spherical aberration, astigmatism and distortion of the third embodiment in order from left to right. As shown in fig. 5, the image capturing device of the third embodiment includes an optical lens assembly (not labeled) and an electronic photosensitive element 395. The optical lens assembly includes, in order from an object side to an image side, an aperture stop 300, a first lens element 310, a second lens element 320, a third lens element 330, a fourth lens element 340, a fifth lens element 350, a sixth lens element 360, a seventh lens element 370, an ir-cut filter element 380 and an image plane 390, and the electro-optic element 395 is disposed on the image plane 390 of the optical lens assembly, wherein the optical lens assembly includes seven lens elements (310 and 370), and a distance is provided between any two adjacent lens elements having refractive power.
The first lens element 310 with positive refractive power has an object-side surface 311 being convex in a paraxial region thereof and an image-side surface 312 being concave in a paraxial region thereof.
The second lens element 320 with positive refractive power has an object-side surface 321 being convex in a paraxial region thereof and an image-side surface 322 being concave in a paraxial region thereof.
The third lens element 330 with positive refractive power has an object-side surface 331 being convex in a paraxial region thereof and an image-side surface 332 being concave in a paraxial region thereof. In addition, the image-side surface 332 of the third lens element includes at least one convex surface on the off-axis side.
The fourth lens element 340 with positive refractive power has an object-side surface 341 being convex in a paraxial region thereof and an image-side surface 342 being convex in a paraxial region thereof.
The fifth lens element 350 with negative refractive power has an object-side surface 351 being concave in a paraxial region thereof and an image-side surface 352 being concave in a paraxial region thereof.
The sixth lens element 360 with positive refractive power has an object-side surface 361 being concave in a paraxial region thereof and an image-side surface 362 being convex in a paraxial region thereof.
The seventh lens element 370 with negative refractive power has an object-side surface 371 being concave in a paraxial region thereof and an image-side surface 372 being concave in a paraxial region thereof. In addition, the seventh lens element image-side surface 372 includes at least one convex surface on an off-axis basis.
The ir-cut filter 380 is made of glass and disposed between the seventh lens element 370 and the image plane 390 without affecting the focal length of the optical lens assembly.
See also table five and table six below.
In the third embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first and second embodiments, and are not repeated herein.
The following data can be derived by matching table five and table six:
< fourth embodiment >
Referring to fig. 7 and 8, wherein fig. 7 is a schematic diagram of an image capturing apparatus according to a fourth embodiment of the invention, and fig. 8 is a graph of spherical aberration, astigmatism and distortion of the fourth embodiment in order from left to right. As shown in fig. 7, the image capturing device of the fourth embodiment includes an optical lens assembly (not numbered) and an electro-optic element 495. The optical lens assembly includes, in order from an object side to an image side, an aperture stop 400, a first lens element 410, a second lens element 420, a third lens element 430, a fourth lens element 440, a fifth lens element 450, a sixth lens element 460, a seventh lens element 470, an ir-cut filter 480 and an image plane 490, and the electro-optic sensor 495 is disposed on the image plane 490, wherein the optical lens assembly includes seven lens elements (410 and 470), and a distance is provided between any two adjacent lens elements having refractive power.
The first lens element 410 with positive refractive power has an object-side surface 411 being convex in a paraxial region thereof and an image-side surface 412 being concave in a paraxial region thereof.
The second lens element 420 with negative refractive power has an object-side surface 421 being convex in a paraxial region thereof and an image-side surface 422 being concave in a paraxial region thereof.
The third lens element 430 with positive refractive power has an object-side surface 431 being convex in a paraxial region thereof and an image-side surface 432 being concave in a paraxial region thereof. In addition, the third lens element image-side surface 432 includes at least one convex surface at an off-axis position.
The fourth lens element 440 with positive refractive power has an object-side surface 441 being convex in a paraxial region thereof and an image-side surface 442 being convex in a paraxial region thereof.
The fifth lens element 450 with negative refractive power has an object-side surface 451 being concave in a paraxial region thereof and an image-side surface 452 being concave in a paraxial region thereof.
The sixth lens element 460 with positive refractive power has an object-side surface 461 being concave in a paraxial region thereof and an image-side surface 462 being convex in a paraxial region thereof.
The seventh lens element 470 with negative refractive power has an object-side surface 471 being concave in a paraxial region thereof and an image-side surface 472 being concave in a paraxial region thereof. In addition, the image-side surface 472 of the seventh lens element includes at least one convex surface at an off-axis position.
The ir-cut filter 480 is made of glass, and is disposed between the seventh lens element 470 and the image plane 490 without affecting the focal length of the optical lens assembly.
See table seven below in conjunction with table eight.
In the fourth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first and second embodiments, and are not repeated herein.
The following data can be derived by matching table seven and table eight:
< fifth embodiment >
Referring to fig. 9 and 10, fig. 9 is a schematic diagram illustrating an image capturing device according to a fifth embodiment of the invention, and fig. 10 is a graph illustrating spherical aberration, astigmatism and distortion of the fifth embodiment in order from left to right. As shown in fig. 9, the image capturing device of the fifth embodiment includes an optical lens assembly (not labeled) and an electronic photosensitive element 595. The optical lens assembly includes, in order from an object side to an image side, an aperture stop 500, a first lens element 510, a second lens element 520, a third lens element 530, a fourth lens element 540, a fifth lens element 550, a sixth lens element 560, a seventh lens element 570, an ir-cut filter 580 and an image plane 590, and the electro-optic element 595 is disposed on the image plane 590 of the optical lens assembly, wherein the optical lens assembly includes seven lens elements (510 and 570), and a distance is provided between any two adjacent lens elements with refractive power.
The first lens element 510 with positive refractive power has an object-side surface 511 being convex in a paraxial region thereof and an image-side surface 512 being concave in a paraxial region thereof.
The second lens element 520 with negative refractive power has an object-side surface 521 being convex in a paraxial region thereof and an image-side surface 522 being concave in a paraxial region thereof.
The third lens element 530 with negative refractive power has an object-side surface 531 being convex in a paraxial region thereof and an image-side surface 532 being concave in a paraxial region thereof. In addition, the image-side surface 532 of the third lens element includes at least one convex surface at an off-axis position.
The fourth lens element 540 with positive refractive power has an object-side surface 541 being convex in a paraxial region thereof and an image-side surface 542 being convex in a paraxial region thereof.
The fifth lens element 550 with negative refractive power has an object-side surface 551 which is concave in a paraxial region thereof and an image-side surface 552 which is concave in a paraxial region thereof.
The sixth lens element 560 with positive refractive power has an object-side surface 561 being concave in a paraxial region thereof and an image-side surface 562 being convex in a paraxial region thereof.
The seventh lens element 570 with negative refractive power has an object-side surface 571 being concave in a paraxial region thereof and an image-side surface 572 being concave in a paraxial region thereof. In addition, the seventh lens element image-side surface 572 includes at least one convex surface at an off-axis position.
The ir-cut filter 580 is made of glass, and is disposed between the seventh lens element 570 and the image plane 590 without affecting the focal length of the optical lens assembly.
The following table nine and table ten are referred to cooperatively.
In the fifth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first and second embodiments, and are not repeated herein.
The following data can be derived from tables nine and ten:
< sixth embodiment >
Referring to fig. 11 and 12, wherein fig. 11 is a schematic diagram illustrating an image capturing device according to a sixth embodiment of the invention, and fig. 12 is a graph illustrating spherical aberration, astigmatism and distortion in the sixth embodiment from left to right. As shown in fig. 11, the image capturing device of the sixth embodiment includes an optical lens assembly (not shown) and an electronic photosensitive element 695. The optical lens assembly includes, in order from an object side to an image side, a first lens element 610, an aperture stop 600, a second lens element 620, a third lens element 630, a fourth lens element 640, a fifth lens element 650, a sixth lens element 660, a seventh lens element 670, an ir-cut filter 680 and an image plane 690, and an electro-optic sensing element 695 is disposed on the image plane 690 of the optical lens assembly, wherein the optical lens assembly includes seven lens elements (610 and 670), and a distance is provided between any two adjacent lens elements with refractive power.
The first lens element 610 with positive refractive power has an object-side surface 611 being convex in a paraxial region thereof and an image-side surface 612 being concave in the paraxial region thereof.
The second lens element 620 with negative refractive power has an object-side surface 621 being convex in a paraxial region thereof and an image-side surface 622 being concave in a paraxial region thereof.
The third lens element 630 with positive refractive power has an object-side surface 631 being convex in a paraxial region thereof and an image-side surface 632 being concave in a paraxial region thereof. In addition, the image-side surface 632 of the third lens element has at least one convex surface on the off-axis side.
The fourth lens element 640 with positive refractive power has an object-side surface 641 being concave in a paraxial region thereof and an image-side surface 642 being convex in a paraxial region thereof.
The fifth lens element 650 with negative refractive power has an object-side surface 651 being convex in a paraxial region thereof and an image-side surface 652 being concave in the paraxial region thereof.
The sixth lens element 660 with positive refractive power has an object-side surface 661 being concave in a paraxial region thereof and an image-side surface 662 being convex in a paraxial region thereof.
The seventh lens element 670 with negative refractive power has an object-side surface 671 being concave in a paraxial region thereof and an image-side surface 672 being concave in a paraxial region thereof. In addition, the image-side surface 672 of the seventh lens element includes at least one convex surface at an off-axis position.
The ir-cut filter 680 is made of glass and disposed between the seventh lens element 670 and the image plane 690 without affecting the focal length of the optical lens assembly.
See also the following table eleven and table twelve.
In the sixth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first and second embodiments, and are not repeated herein.
The following data can be derived from table eleven and table twelve:
< seventh embodiment >
Fig. 16 is a schematic diagram illustrating an electronic device 10 according to a seventh embodiment of the invention. The electronic device 10 of the seventh embodiment is a smart phone, and the electronic device 10 includes an image capturing device 11, where the image capturing device 11 includes an optical lens assembly (not shown) and an electronic photosensitive element (not shown) according to the invention, where the electronic photosensitive element is disposed on an image plane of the optical lens assembly.
< eighth embodiment >
Fig. 17 is a schematic diagram illustrating an electronic device 20 according to an eighth embodiment of the invention. The electronic device 20 of the eighth embodiment is a tablet computer, and the electronic device 20 includes an image capturing device 21, and the image capturing device 21 includes an optical lens assembly (not shown) and an electronic photosensitive element (not shown) according to the invention, wherein the electronic photosensitive element is disposed on an image plane of the optical lens assembly.
< ninth embodiment >
Fig. 18 is a schematic view illustrating an electronic device 30 according to a ninth embodiment of the invention. The electronic device 30 of the ninth embodiment is a Head-mounted display (HMD), and the electronic device 30 includes an image capturing device 31, where the image capturing device 31 includes an optical lens assembly (not shown) and an electronic photosensitive element (not shown) according to the present invention, where the electronic photosensitive element is disposed on an image plane of the optical lens assembly.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (14)
1. An optical lens assembly, in order from an object side to an image side comprising: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein the first lens element with positive refractive power has an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region, the second lens element with negative refractive power has a concave image-side surface at a paraxial region thereof, the third lens element has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof, the fourth lens element with positive refractive power and the fifth lens element with negative refractive power has a concave image-side surface at the paraxial region, the sixth lens element with positive refractive power and the seventh lens element with negative refractive power has a concave image-side surface at the paraxial region, the seventh lens element has an image-side surface and an object-side surface, wherein the image-side surface of the seventh lens element includes at least one convex surface;
wherein, the total number of the lenses in the optical lens assembly is seven, and a distance is formed between any two adjacent lenses, the distance from the object-side surface of the first lens to an imaging surface on the optical axis is TL, the maximum image height of the optical lens assembly is ImgH, which satisfies the following conditions:
TL/ImgH<1.80。
2. the optical lens assembly of claim 1, wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is Td, and a sum of thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element is Σ CT, wherein the following conditions are satisfied:
1.0<Td/ΣCT<1.45。
3. the optical lens assembly of claim 1, wherein the second lens element has an abbe number of V2, and the fifth lens element has an abbe number of V5, which satisfy the following conditions:
30<V2+V5<85。
4. the optical lens assembly of claim 1, wherein the curvature radius of the image-side surface of the seventh lens element is R14, and the focal length of the optical lens assembly is f, satisfying the following condition:
0<R14/f<0.60。
5. the optical lens assembly of claim 1, wherein the focal length of the optical lens assembly is f, and the combined focal length of the third lens element, the fourth lens element and the fifth lens element is f345, which satisfies the following condition:
0<f/f345<1.0。
6. the optical lens assembly of claim 1, further comprising an aperture stop disposed between a subject and the first lens element.
7. The optical lens assembly of claim 1, wherein a vertical distance between a critical point of the image-side surface of the third lens element and the optical axis is Yc32, and a vertical distance between a critical point of the image-side surface of the seventh lens element and the optical axis is Yc72, wherein the following conditions are satisfied:
0.3<Yc32/Yc72<0.75。
8. the optical lens assembly of claim 1, wherein the seventh lens element has an object-side surface with a radius of curvature R13 and an image-side surface with a radius of curvature R14, wherein the following conditions are satisfied:
0.30<(R13+R14)/(R13-R14)。
9. the optical lens assembly of claim 1, wherein the object-side surface of the second lens element is convex at a paraxial region thereof.
10. The optical lens assembly of claim 1, wherein the third lens element has negative refractive power.
11. The optical lens assembly of claim 1, wherein the object-side surface of the fifth lens element is convex at a paraxial region.
12. The optical lens assembly of claim 1, wherein the image-side surface of the sixth lens element is convex at the paraxial region.
13. The optical lens assembly of claim 1, wherein the object-side surface of the sixth lens element is concave at a paraxial region thereof.
14. An image capturing device, comprising:
the optical lens group of claim 1; and
an electronic photosensitive element disposed on the image plane of the optical lens assembly.
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| Publication number | Publication date |
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| CN106154513A (en) | 2016-11-23 |
| CN109581632A (en) | 2019-04-05 |
| CN106154513B (en) | 2019-03-01 |
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