CN111308667A - Optical system, lens module and terminal equipment - Google Patents
Optical system, lens module and terminal equipment Download PDFInfo
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- CN111308667A CN111308667A CN202010260761.6A CN202010260761A CN111308667A CN 111308667 A CN111308667 A CN 111308667A CN 202010260761 A CN202010260761 A CN 202010260761A CN 111308667 A CN111308667 A CN 111308667A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The embodiment of the application discloses an optical system, a lens module and terminal equipment. The optical system comprises a first lens with positive refractive power, a second lens with negative refractive power, a third lens, a fourth lens, a fifth lens with refractive power and a sixth lens. The object-side surface of the first lens element is convex at the optical axis, the image-side surface of the second lens element is concave at the optical axis, the object-side surface of the third lens element is convex at the optical axis, the image-side surface of the third lens element is concave at the optical axis, and the image-side surface of the fourth lens element is concave at the optical axis. The optical system satisfies the following conditional expression: 1< ftLtl4/ftGtl4< 1.5; ftLtl4 and ftGtl4 are the longest and shortest distances from the object-side surface of the fourth lens to the image-side surface of the fourth lens, respectively, in the direction parallel to the optical axis. By reasonably configuring the refractive powers of the first lens element to the sixth lens element and the surface shapes of the first lens element to the fourth lens element, the optical system has a long focal length and good imaging quality, and high-definition long-range shooting can be realized.
Description
Technical Field
The application belongs to the technical field of optical imaging, and particularly relates to an optical system, a lens module and a terminal device.
Background
With the wide application of mobile phones, tablet computers, unmanned planes, computers and other electronic products in life, various technological improvements are emerging. Among them, the improvement and innovation of the shooting effect of the camera lens in the novel electronic product become the key points of people's attention.
At present, along with the increase of the requirement of long-range shooting, the camera lens needs to have a long focal length, but the problem of image field curvature is easy to occur, and the integral imaging quality is difficult to ensure, so that the long-range shooting effect is poor.
Therefore, how to realize long-range shooting and high-definition shooting and avoid the problem of field curvature so as to clearly image a scene with a long object distance on an imaging surface is the research and development direction in the industry.
Disclosure of Invention
The embodiment of the application provides an optical system, a lens module and terminal equipment, and the optical system solves the problem of poor imaging quality in long-range shooting and can realize high-definition long-range shooting.
In a first aspect, an embodiment of the present application provides an optical system, which includes a plurality of lenses, where the plurality of lenses includes a first lens element with positive refractive power and arranged in order from an object side to an image side, and an object side surface of the first lens element is a convex surface at an optical axis; the second lens element with negative refractive power has a concave image-side surface at an optical axis; the third lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the fourth lens element with negative refractive power has a concave image-side surface at an optical axis; a fifth lens element with refractive power; the sixth lens element with refractive power. The optical system satisfies the following conditional expression: 1< ftLtl4/ftGtl4< 1.5; ftLtl4 is the longest distance from the object-side surface of the fourth lens to the image-side surface of the fourth lens in the direction parallel to the optical axis, and ftGtl4 is the shortest distance from the object-side surface of the fourth lens to the image-side surface of the fourth lens in the direction parallel to the optical axis.
This application is through the face type of the first lens of rational configuration first lens to the sixth lens among the optical system and first lens, the second lens, the third lens and the fourth lens, make optical system have the characteristic of long focal length, and have good imaging quality, can realize high-definition long-range scene shooting, set up 1< ftLtl4/ftGtl4<1.5 simultaneously and can effectively balance optical path difference of optical system, realize the function of revising the curvature of field, avoid appearing warping around the image, make the imaging effect more close to by shooting object itself, and make the picture of shooing have high drawing feel, high resolution and high definition.
In one embodiment, the optical system satisfies the conditional expression: 0.5< DL1/Imgh < 1; DL1 is the effective aperture of the first lens, and Imgh is half the length of the diagonal line of the effective pixel area on the imaging plane of the optical system. The aperture size of the first lens in the optical system determines the light transmission amount of the whole optical system, the size of the photosensitive surface determines the image definition and the pixel size of the whole optical system, and the first lens and the second lens are reasonably matched to ensure enough light transmission amount and ensure the definition of a shot image. If DL1/Imgh >1, the exposure is too large, the brightness is too high, and the picture quality is affected, while if DL1/Imgh <0.5, the light flux is insufficient, the relative brightness of the light is insufficient, and the picture definition is reduced.
In one embodiment, the optical system satisfies the conditional expression: 2< f/f1< 3; f is the effective focal length of the optical system, and f1 is the focal length of the first lens. The first lens provides all optical information of the optical system from an object space to an image space, the focal length of the first lens determines the acquisition of the optical information of the optical system to the object space, if f/f1 is larger than or equal to 3, the sensitivity of the system is increased, the processing technology is difficult, the difficulty of aberration correction generated by the first lens is increased, the shooting requirement is difficult to meet, if f/f1 is smaller than or equal to 2, the focal length ratio of the first lens to the optical system is not proper, and the aberration generated by the first lens cannot be corrected.
In one embodiment, the optical system satisfies the conditional expression: -0.5< f1/f2< -0.2; f1 is the focal length of the first lens, and f2 is the focal length of the second lens. The first lens provides positive refractive power to converge light, so that light in a converged object space is facilitated, the second lens provides negative refractive power to correct positional chromatic aberration brought by the first lens, and the combination of the first lens with positive refractive power and the second lens with negative refractive power can effectively correct positional chromatic aberration and improve imaging definition.
In one embodiment, the optical system satisfies the conditional expression: 0.05< air 3/TTL < 0.3; airL3 is a distance on an optical axis from an image-side surface of the third lens element to an object-side surface of the fourth lens element, and TTL is a distance on the optical axis from an object-side surface of the first lens element to an image plane of the optical system. By limiting the proper range of air L3/TTL, the assembly sensitivity of the optical system can be reduced, and the assembly yield can be improved. If air L3/TTL >0.3, the system will be too long, and if air L3/TTL <0.05, the system sensitivity will be increased and the production yield will be reduced.
In one embodiment, the optical system satisfies the conditional expression: 1mm < (R5 × R6)/(R5+ R6) <4.5 mm; r5 is a radius of curvature of an object-side surface of the third lens at an optical axis, and R6 is a radius of curvature of an image-side surface of the third lens at the optical axis. By limiting the proper range of (R5R 6)/(R5R 6), the optical path difference between the marginal ray and the paraxial ray of the optical system can be reasonably balanced, the curvature of field and the astigmatism can be reasonably corrected, and meanwhile, the system sensitivity is reduced, and the assembly stability is improved.
In one embodiment, the optical system satisfies the conditional expression: FBL/TTL > 0.1; the FBL is a distance on the optical axis from an intersection point of the image-side surface of the sixth lens element and the optical axis to the imaging surface, and the TTL is a distance on the optical axis from the object-side surface of the first lens element to the imaging surface of the optical system. Through the suitable scope of injecing FBL TTL, can guarantee when satisfying the miniaturization that the system has sufficient focusing range, promote optical system's equipment yield, guarantee optical system's the depth of focus great simultaneously, can acquire the more degree of depth information of object space.
In one embodiment, the optical system further includes a stop located on the object side of the first lens or between two adjacent lenses, and the optical system satisfies the following conditional expression: 0.5< DL/Imgh < 1; DL is the aperture of the diaphragm of the optical system, and Imgh is half of the length of the diagonal line of the effective pixel area on the imaging surface of the optical system. The aperture size of the diaphragm of the optical system determines the light transmission quantity of the whole optical system, the size of the photosensitive surface determines the image definition and the pixel size of the whole optical system, and the light transmission quantity and the pixel size are reasonably matched to ensure enough light transmission quantity and ensure the definition of a shot image. If DL/Imgh >1, the exposure is too large, the brightness is too high, and the picture quality is affected, while if DL/Imgh <0.5, the light transmission is insufficient, the relative brightness of the light is insufficient, and the picture sensitivity is reduced.
In one embodiment, the optical system further includes a stop located on the object side of the first lens or between two adjacent lenses, and the optical system satisfies the following conditional expression: 1.5< TTL/DL < 2.2; TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface of the optical system, and DL is an aperture of the diaphragm of the optical system. By limiting the appropriate range of TTL/DL, the optical system can meet the design requirement of miniaturization, provide the light flux required by the shooting of the optical system and realize the high-image-quality and high-definition shooting effect. If TTL/DL <1.5, can satisfy miniaturized design, but can cause to lead to light aperture too big, marginal light gets into optical system, reduces image quality, if TTL/DL >2.2, can satisfy miniaturized design, but can cause the light aperture of passing through of diaphragm undersize, can't satisfy the light volume that the system needs.
In one embodiment, the optical system satisfies the conditional expression: 0.7< TTL/f < 1; TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface of the optical system, and f is an effective focal length of the optical system. By limiting the appropriate range of TTL/f, the miniaturization of an optical system can be realized, and meanwhile, the light can be guaranteed to better converge on an imaging surface. If TTL/f is less than or equal to 0.7, the optical system is too short, which may increase the sensitivity of the system and is not favorable for the light to converge on the imaging surface, and if TTL/f is greater than or equal to 1, the optical system is too long, which may cause the angle of the chief ray incident on the imaging surface to be too large and the marginal ray to be incident on the imaging surface, which may cause the imaging information to be incomplete.
In a second aspect, the present application provides a lens module, which includes a photosensitive element and the optical system of any one of the foregoing embodiments, wherein the photosensitive element is located on an image side of the optical system.
In a third aspect, the present application provides a terminal device, including the lens module.
The optical system has the characteristic of long focal length and good imaging quality by reasonably configuring the refractive power of the first lens to the sixth lens and the surface type of the first lens, the second lens, the third lens and the fourth lens in the optical system, and can realize high-definition long-range shooting, and meanwhile, 1< ftLtl4/ftGtl4<1.5 can effectively balance the optical path difference of the optical system, realize the function of correcting curvature of field, avoid distortion around the image, enable the imaging effect to be closer to the shot object, and enable the shot picture to have high painting quality, high resolution and high definition.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.
FIG. 1 is a schematic diagram of an optical system provided herein in a terminal device;
FIG. 2 is a schematic diagram of an optical system according to a first embodiment of the present application;
fig. 3 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the first embodiment;
FIG. 4 is a schematic diagram of an optical system provided in a second embodiment of the present application;
FIG. 5 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the second embodiment;
FIG. 6 is a schematic diagram of an optical system provided in a third embodiment of the present application;
fig. 7 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the third embodiment;
FIG. 8 is a schematic diagram of an optical system according to a fourth embodiment of the present application;
fig. 9 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the fourth embodiment;
fig. 10 is a schematic structural diagram of an optical system provided in a fifth embodiment of the present application;
fig. 11 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the fifth embodiment;
fig. 12 is a schematic structural diagram of an optical system provided in a sixth embodiment of the present application;
fig. 13 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the sixth embodiment;
fig. 14 is a schematic structural diagram of an optical system provided in a seventh embodiment of the present application;
fig. 15 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the seventh embodiment;
fig. 16 is a schematic structural diagram of an optical system according to an eighth embodiment of the present application;
fig. 17 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the eighth embodiment.
Detailed Description
The embodiments of the present application will be described below with reference to the drawings.
Referring to fig. 1, the optical system according to the present application is applied to a lens module 20 in a terminal device 30. The terminal device 30 may be a mobile phone, a tablet computer, an unmanned aerial vehicle, a computer, or the like. The light sensing element of the lens module 20 is located at the image side of the optical system, and the lens module 20 is assembled inside the terminal device 30.
The application provides a lens module, including photosensitive element and the optical system that this application embodiment provided, photosensitive element is located optical system's image side for incidenting the light on the electron photosensitive element and passing first lens to sixth lens converts the signal of telecommunication of image into. The electron sensor may be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge-coupled Device (CCD). The optical system is arranged in the lens module, so that the lens module has the characteristic of long focal length and good imaging quality, and high-definition long-range shooting can be realized.
The application further provides a terminal device, and the terminal device comprises the lens module provided by the embodiment of the application. The terminal equipment can be a mobile phone, a tablet personal computer, an unmanned aerial vehicle, a computer and the like. The lens module is installed in the terminal equipment, so that the terminal equipment has the characteristic of long focal length, has good imaging quality and can realize high-definition long-range shooting.
An optical system provided by the present application includes six lenses, which are, in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens.
Specifically, the surface shapes and refractive powers of the six lenses are as follows:
the first lens element with positive refractive power has a convex object-side surface at an optical axis; the second lens element with negative refractive power has a concave image-side surface at the optical axis; the third lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the fourth lens element with negative refractive power has a concave image-side surface at the optical axis; a fifth lens element with refractive power; the sixth lens element with refractive power.
The optical system satisfies the following conditional expression: 1< ftLtl4/ftGtl4< 1.5; ftLtl4 is the longest distance from the object-side surface of the fourth lens to the image-side surface of the fourth lens in the direction parallel to the optical axis, and ftGtl4 is the shortest distance from the object-side surface of the fourth lens to the image-side surface of the fourth lens in the direction parallel to the optical axis.
The refractive power of the first lens to the sixth lens and the surface type of the first lens, the second lens, the third lens and the fourth lens in the optical system are reasonably configured, so that the optical system has the characteristic of long focal length, and has good imaging quality, high-definition long-range shooting can be realized, meanwhile, 1< ftLtl4/ftGtl4<1.5 can effectively balance the optical path difference of the optical system, realize the function of correcting curvature of field, avoid distortion around the image, enable the imaging effect to be closer to the shot object, and enable the shot picture to have high painting quality, high resolution and high definition.
In one embodiment, the optical system satisfies the conditional expression: 0.5< DL1/Imgh < 1; DL1 is the effective aperture of the first lens, and Imgh is half the length of the diagonal line of the effective pixel area on the imaging plane of the optical system. The aperture size of the first lens in the optical system determines the light transmission amount of the whole optical system, the size of the photosensitive surface determines the image definition and the pixel size of the whole optical system, and the first lens and the second lens are reasonably matched to ensure enough light transmission amount and ensure the definition of a shot image. If DL1/Imgh >1, the exposure is too large, the brightness is too high, and the picture quality is affected, while if DL1/Imgh <0.5, the light flux is insufficient, the relative brightness of the light is insufficient, and the picture definition is reduced.
In one embodiment, the optical system satisfies the conditional expression: 2< f/f1< 3; f is the effective focal length of the optical system, and f1 is the focal length of the first lens. The first lens provides all optical information of the optical system from an object space to an image space, the focal length of the first lens determines the acquisition of the optical information of the optical system to the object space, if f/f1 is larger than or equal to 3, the sensitivity of the system is increased, the processing technology is difficult, the difficulty of aberration correction generated by the first lens is increased, the shooting requirement is difficult to meet, if f/f1 is smaller than or equal to 2, the focal length ratio of the first lens to the optical system is not proper, and the aberration generated by the first lens cannot be corrected.
In one embodiment, the optical system satisfies the conditional expression: -0.5< f1/f2< -0.2; f1 is the focal length of the first lens, and f2 is the focal length of the second lens. The first lens provides positive refractive power to converge light, so that light in a converged object space is facilitated, the second lens provides negative refractive power to correct positional chromatic aberration brought by the first lens, and the combination of the first lens with positive refractive power and the second lens with negative refractive power can effectively correct positional chromatic aberration and improve imaging definition.
In one embodiment, the optical system satisfies the conditional expression: 0.05< air 3/TTL < 0.3; airL3 is a distance on an optical axis from an image-side surface of the third lens element to an object-side surface of the fourth lens element, and TTL is a distance on the optical axis from an object-side surface of the first lens element to an image plane of the optical system. By limiting the proper range of air L3/TTL, the assembly sensitivity of the optical system can be reduced, and the assembly yield can be improved. If air L3/TTL >0.3, the system will be too long, and if air L3/TTL <0.05, the system sensitivity will be increased and the production yield will be reduced.
In one embodiment, the optical system satisfies the conditional expression: 1mm < (R5 × R6)/(R5+ R6) <4.5 mm; r5 is a radius of curvature of an object-side surface of the third lens at an optical axis, and R6 is a radius of curvature of an image-side surface of the third lens at the optical axis. By limiting the proper range of (R5R 6)/(R5R 6), the optical path difference between the marginal ray and the paraxial ray of the optical system can be reasonably balanced, the curvature of field and the astigmatism can be reasonably corrected, and meanwhile, the system sensitivity is reduced, and the assembly stability is improved.
In one embodiment, the optical system satisfies the conditional expression: FBL/TTL > 0.1; the FBL is a distance on the optical axis from an intersection point of the image-side surface of the sixth lens element and the optical axis to the imaging surface, and the TTL is a distance on the optical axis from the object-side surface of the first lens element to the imaging surface of the optical system. Through the suitable scope of injecing FBL TTL, can guarantee when satisfying the miniaturization that the system has sufficient focusing range, promote optical system's equipment yield, guarantee optical system's the depth of focus great simultaneously, can acquire the more degree of depth information of object space.
In one embodiment, the optical system further includes a stop located on the object side of the first lens or between two adjacent lenses, and the optical system satisfies the following conditional expression: 0.5< DL/Imgh < 1; DL is the aperture of the diaphragm of the optical system, and Imgh is half of the length of the diagonal line of the effective pixel area on the imaging surface of the optical system. The aperture size of the diaphragm of the optical system determines the light transmission quantity of the whole optical system, the size of the photosensitive surface determines the image definition and the pixel size of the whole optical system, and the light transmission quantity and the pixel size are reasonably matched to ensure enough light transmission quantity and ensure the definition of a shot image. If DL/Imgh >1, the exposure is too large, the brightness is too high, and the picture quality is affected, while if DL/Imgh <0.5, the light transmission is insufficient, the relative brightness of the light is insufficient, and the picture sensitivity is reduced.
In one embodiment, the optical system further includes a stop located on the object side of the first lens or between two adjacent lenses, and the optical system satisfies the following conditional expression: 1.5< TTL/DL < 2.2; TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface of the optical system, and DL is an aperture of the diaphragm of the optical system. By limiting the appropriate range of TTL/DL, the optical system can meet the design requirement of miniaturization, provide the light flux required by the shooting of the optical system and realize the high-image-quality and high-definition shooting effect. If TTL/DL <1.5, can satisfy miniaturized design, but can cause to lead to light aperture too big, marginal light gets into optical system, reduces image quality, if TTL/DL >2.2, can satisfy miniaturized design, but can cause the light aperture of passing through of diaphragm undersize, can't satisfy the light volume that the system needs.
In one embodiment, the optical system satisfies the conditional expression: 0.7< TTL/f < 1; TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface of the optical system, and f is an effective focal length of the optical system. By limiting the appropriate range of TTL/f, the miniaturization of an optical system can be realized, and meanwhile, the light can be guaranteed to better converge on an imaging surface. If TTL/f is less than or equal to 0.7, the optical system is too short, which may increase the sensitivity of the system and is not favorable for the light to converge on the imaging surface, and if TTL/f is greater than or equal to 1, the optical system is too long, which may cause the angle of the chief ray incident on the imaging surface to be too large and the marginal ray to be incident on the imaging surface, which may cause the imaging information to be incomplete.
Through the definition of the above parameters, the optical system has good imaging quality, for example, it is preferable that: the value of ftLtl4/ftGtl4 may be 1.04, 1.26, 1.24, etc., the value of DL1/Imgh may be 0.81, 0.70, 0.69, etc., the value of f/f1 may be 2.31, 2.47, 2.39, etc., the value of f1/f2 may be-0.45, 0.41, 0.39, etc., and the value of air L3/TTL may be 0.18, 0.17, 0.16, etc.
The optical system is provided with an aspheric lens, which is beneficial to correcting system aberration and improving system imaging quality. The aspheric curve equation includes, but is not limited to, the following equation:
wherein Z is a distance from a corresponding point on the aspherical surface to a plane tangent to the surface vertex, r is a distance from a corresponding point on the aspherical surface to the optical axis, c is a curvature of the aspherical surface vertex, k is a conic constant, and Ai is a coefficient corresponding to the i-th high-order term in the aspherical surface type formula.
The present application will be described in detail below with reference to eight specific examples.
Example one
As shown in fig. 2, a straight line 11 indicates an optical axis, a side of the first lens L1 away from the second lens L2 is an object side 12, and a side of the sixth lens L6 away from the fifth lens L5 is an image side 13. In the optical system provided in this embodiment, the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter element IRCF are arranged in order from the object side 12 to the image side 13.
The first lens element L1 with positive refractive power has a convex object-side surface S1 along the optical axis and at the circumference, and a convex image-side surface S2 along the optical axis and at the circumference.
The second lens element L2 with negative refractive power is made of plastic material, and has a concave object-side surface S3 along the optical axis, a convex object-side surface S3 along the circumference, and a concave image-side surface S4 along the optical axis and the circumference.
The third lens element L3 with negative refractive power is made of plastic material, and has an object-side surface S5 being convex along the optical axis and at the circumference, and an image-side surface S6 being concave along the optical axis and at the circumference.
The fourth lens element L4 with negative refractive power has a concave object-side surface S7 along the optical axis and at the circumference, and a concave image-side surface S8 along the optical axis and at the circumference.
The fifth lens element L5 with positive refractive power is made of plastic material, and has a concave object-side surface S9 along the optical axis and at the circumference, and a convex image-side surface S10 along the optical axis and at the circumference.
The sixth lens element L6 with negative refractive power is made of plastic material, and has a concave object-side surface S11 along the optical axis and at the circumference, and a convex image-side surface S12 along the optical axis and at the circumference.
The stop STO may be located between the object side of the optical system and the sixth lens, and the stop STO in the present embodiment is provided on the side of the first lens L1 away from the second lens L2, for controlling the amount of incoming light.
The infrared filter element IRCF is arranged behind the sixth lens L6 and comprises an object side surface S13 and an image side surface S14, the infrared filter element IRCF is used for filtering infrared rays, the rays incident to the image side surface are visible rays, the wavelength of the visible rays is 380nm-780nm, and the infrared filter element IRCF is made of glass.
The image forming surface S15 is a surface on which an image is formed by the light of the subject passing through the optical system.
Table 1a shows a characteristic table of the optical system of the present embodiment, in which the radius of curvature in the present embodiment is the radius of curvature of each lens at the optical axis.
TABLE 1a
Wherein f is an effective focal length of the optical system, FNO is an f-number of the optical system, FOV is a field angle of the optical system in a diagonal direction, and TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical system on an optical axis.
Table 1b shows the high-order term coefficients a4, A6, a8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspherical mirror surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 in the first embodiment.
TABLE 1b
Fig. 3 shows a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the first embodiment. The longitudinal spherical aberration curve represents the deviation of the convergence focus of the light rays with different wavelengths after passing through each lens of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 3, the optical system according to the first embodiment can achieve good imaging quality.
Example two
As shown in fig. 4, a straight line 11 indicates an optical axis, a side of the first lens L1 away from the second lens L2 is an object side 12, and a side of the sixth lens L6 away from the fifth lens L5 is an image side 13. In the optical system provided in this embodiment, the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter element IRCF are arranged in order from the object side 12 to the image side 13.
The first lens element L1 with positive refractive power has a convex object-side surface S1 along the optical axis and at the circumference, and a convex image-side surface S2 along the optical axis and at the circumference.
The second lens element L2 with negative refractive power is made of plastic material, and has an object-side surface S3 being convex along the optical axis and at the circumference, and an image-side surface S4 being concave along the optical axis and at the circumference.
The third lens element L3 with negative refractive power is made of plastic material, and has an object-side surface S5 being convex along the optical axis and at the circumference, and an image-side surface S6 being concave along the optical axis and at the circumference.
The fourth lens element L4 with negative refractive power has a concave object-side surface S7 along the optical axis and at the circumference, and a concave image-side surface S8 along the optical axis and at the circumference.
The fifth lens element L5 with positive refractive power is made of plastic material, and has a concave object-side surface S9 along the optical axis and at the circumference, and a convex image-side surface S10 along the optical axis and at the circumference.
The sixth lens element L6 with negative refractive power is made of plastic material, and has a concave object-side surface S11 along the optical axis and at the circumference, and a convex image-side surface S12 along the optical axis and at the circumference.
The stop STO may be located between the object side of the optical system and the sixth lens, and the stop STO in the present embodiment is provided on the side of the first lens L1 away from the second lens L2, for controlling the amount of incoming light.
The infrared filter element IRCF is arranged behind the sixth lens L6 and comprises an object side surface S13 and an image side surface S14, the infrared filter element IRCF is used for filtering infrared rays, the rays incident to the image side surface are visible rays, the wavelength of the visible rays is 380nm-780nm, and the infrared filter element IRCF is made of glass.
The image forming surface S15 is a surface on which an image is formed by the light of the subject passing through the optical system.
Table 2a shows a characteristic table of the optical system of the present embodiment, in which the radius of curvature in the present embodiment is the radius of curvature of each lens at the optical axis.
TABLE 2a
Wherein f is an effective focal length of the optical system, FNO is an f-number of the optical system, FOV is a field angle of the optical system in a diagonal direction, and TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical system on an optical axis.
Table 2b shows the high-order term coefficients a4, A6, a8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspherical mirror surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 in the second embodiment.
TABLE 2b
Fig. 5 shows a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the second embodiment. The longitudinal spherical aberration curve represents the deviation of the convergence focus of the light rays with different wavelengths after passing through each lens of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 5, the optical system according to the second embodiment can achieve good imaging quality.
EXAMPLE III
As shown in fig. 6, a straight line 11 indicates an optical axis, a side of the first lens L1 away from the second lens L2 is an object side 12, and a side of the sixth lens L6 away from the fifth lens L5 is an image side 13. In the optical system provided in this embodiment, the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter element IRCF are arranged in order from the object side 12 to the image side 13.
The first lens element L1 with positive refractive power has a convex object-side surface S1 along the optical axis and at the circumference, and a convex image-side surface S2 along the optical axis and at the circumference.
The second lens element L2 with negative refractive power is made of plastic material, and has an object-side surface S3 being convex along the optical axis and at the circumference, and an image-side surface S4 being concave along the optical axis and at the circumference.
The third lens element L3 with negative refractive power is made of plastic material, and has an object-side surface S5 being convex along the optical axis and at the circumference, and an image-side surface S6 being concave along the optical axis and at the circumference.
The fourth lens element L4 with negative refractive power has a concave object-side surface S7 along the optical axis and at the circumference, and a concave image-side surface S8 along the optical axis and at the circumference.
The fifth lens element L5 with positive refractive power is made of plastic material, and has a convex object-side surface S9 along the optical axis, a concave object-side surface S9 along the circumference, and a convex image-side surface S10 along the optical axis and the circumference.
The sixth lens element L6 with negative refractive power is made of plastic material, and has a concave object-side surface S11 along the optical axis and at the circumference, and a convex image-side surface S12 along the optical axis and at the circumference.
The stop STO may be located between the object side of the optical system and the sixth lens, and the stop STO in the present embodiment is provided on the side of the first lens L1 away from the second lens L2, for controlling the amount of incoming light.
The infrared filter element IRCF is arranged behind the sixth lens L6 and comprises an object side surface S13 and an image side surface S14, the infrared filter element IRCF is used for filtering infrared rays, the rays incident to the image side surface are visible rays, the wavelength of the visible rays is 380nm-780nm, and the infrared filter element IRCF is made of glass.
The image forming surface S15 is a surface on which an image is formed by the light of the subject passing through the optical system.
Table 3a shows a characteristic table of the optical system of the present embodiment, in which the radius of curvature in the present embodiment is the radius of curvature of each lens at the optical axis.
TABLE 3a
Wherein f is an effective focal length of the optical system, FNO is an f-number of the optical system, FOV is a field angle of the optical system in a diagonal direction, and TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical system on an optical axis.
Table 3b shows the high-order term coefficients a4, A6, a8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspherical mirror surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 in the third embodiment.
TABLE 3b
Fig. 7 shows a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the third embodiment. The longitudinal spherical aberration curve represents the deviation of the convergence focus of the light rays with different wavelengths after passing through each lens of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 7, the optical system according to the third embodiment can achieve good image quality.
Example four
As shown in fig. 8, a straight line 11 indicates an optical axis, a side of the first lens L1 away from the second lens L2 is an object side 12, and a side of the sixth lens L6 away from the fifth lens L5 is an image side 13. In the optical system provided in this embodiment, the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter element IRCF are arranged in order from the object side 12 to the image side 13.
The first lens element L1 with positive refractive power has a convex object-side surface S1 along the optical axis and at the circumference, and a convex image-side surface S2 along the optical axis and at the circumference.
The second lens element L2 with negative refractive power is made of plastic material, and has an object-side surface S3 being convex along the optical axis and at the circumference, and an image-side surface S4 being concave along the optical axis and at the circumference.
The third lens element L3 with negative refractive power is made of plastic material, and has a convex object-side surface S5 along the optical axis, a concave object-side surface S5 along the circumference, and a concave image-side surface S6 along the optical axis and the circumference.
The fourth lens element L4 with negative refractive power is made of plastic material, and has a convex object-side surface S7 along the optical axis, a concave object-side surface S7 along the circumference, and a concave image-side surface S8 along the optical axis and the circumference.
The fifth lens element L5 with positive refractive power is made of plastic material, and has a concave object-side surface S9 along the optical axis and at the circumference, and a convex image-side surface S10 along the optical axis and at the circumference.
The sixth lens element L6 with negative refractive power is made of plastic material, and has a concave object-side surface S11 along the optical axis and at the periphery, a concave image-side surface S12 along the optical axis, and a convex image-side surface S12 along the periphery.
The stop STO may be located between the object side of the optical system and the sixth lens, and the stop STO in the present embodiment is provided on the side of the first lens L1 away from the second lens L2, for controlling the amount of incoming light.
The infrared filter element IRCF is arranged behind the sixth lens L6 and comprises an object side surface S13 and an image side surface S14, the infrared filter element IRCF is used for filtering infrared rays, the rays incident to the image side surface are visible rays, the wavelength of the visible rays is 380nm-780nm, and the infrared filter element IRCF is made of glass.
The image forming surface S15 is a surface on which an image is formed by the light of the subject passing through the optical system.
Table 4a shows a characteristic table of the optical system of the present embodiment, in which the radius of curvature in the present embodiment is the radius of curvature of each lens at the optical axis.
TABLE 4a
Wherein f is an effective focal length of the optical system, FNO is an f-number of the optical system, FOV is a field angle of the optical system in a diagonal direction, and TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical system on an optical axis.
Table 4b shows the high-order term coefficients a4, A6, a8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspherical mirror surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 in the fourth embodiment.
TABLE 4b
Fig. 9 shows a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the fourth embodiment. The longitudinal spherical aberration curve represents the deviation of the convergence focus of the light rays with different wavelengths after passing through each lens of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 9, the optical system according to the fourth embodiment can achieve good image quality.
EXAMPLE five
As shown in fig. 10, a straight line 11 indicates an optical axis, a side of the first lens L1 away from the second lens L2 is an object side 12, and a side of the sixth lens L6 away from the fifth lens L5 is an image side 13. In the optical system provided in this embodiment, the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter element IRCF are arranged in order from the object side 12 to the image side 13.
The first lens element L1 with positive refractive power has a convex object-side surface S1 along the optical axis and at the circumference, and a convex image-side surface S2 along the optical axis and at the circumference.
The second lens element L2 with negative refractive power is made of plastic material, and has an object-side surface S3 being convex along the optical axis and at the circumference, and an image-side surface S4 being concave along the optical axis and at the circumference.
The third lens element L3 with negative refractive power is made of plastic material, and has a convex object-side surface S5 along the optical axis, a concave object-side surface S5 along the circumference, and a concave image-side surface S6 along the optical axis and the circumference.
The fourth lens element L4 with negative refractive power is made of plastic material, and has a convex object-side surface S7 along the optical axis, a concave object-side surface S7 along the circumference, and a concave image-side surface S8 along the optical axis and the circumference.
The fifth lens element L5 with negative refractive power is made of plastic material, and has a concave object-side surface S9 along the optical axis and at the circumference, and a convex image-side surface S10 along the optical axis and at the circumference.
The sixth lens element L6 with positive refractive power is made of plastic material, and has a convex object-side surface S11 along the optical axis, a concave object-side surface S11 along the circumference, and a convex image-side surface S12 along the optical axis and the circumference.
The stop STO may be located between the object side of the optical system and the sixth lens, and the stop STO in the present embodiment is provided on the side of the first lens L1 away from the second lens L2, for controlling the amount of incoming light.
The infrared filter element IRCF is arranged behind the sixth lens L6 and comprises an object side surface S13 and an image side surface S14, the infrared filter element IRCF is used for filtering infrared rays, the rays incident to the image side surface are visible rays, the wavelength of the visible rays is 380nm-780nm, and the infrared filter element IRCF is made of glass.
The image forming surface S15 is a surface on which an image is formed by the light of the subject passing through the optical system.
Table 5a shows a characteristic table of the optical system of the present embodiment, in which the radius of curvature in the present embodiment is the radius of curvature of each lens at the optical axis.
TABLE 5a
Wherein f is an effective focal length of the optical system, FNO is an f-number of the optical system, FOV is a field angle of the optical system in a diagonal direction, and TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical system on an optical axis.
Table 5b shows the high-order term coefficients a4, A6, a8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspherical mirror surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 in the fifth embodiment.
TABLE 5b
Fig. 11 shows a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the fifth embodiment. The longitudinal spherical aberration curve represents the deviation of the convergence focus of the light rays with different wavelengths after passing through each lens of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 11, the optical system according to the fifth embodiment can achieve good image quality.
EXAMPLE six
As shown in fig. 12, a straight line 11 indicates an optical axis, a side of the first lens L1 away from the second lens L2 is an object side 12, and a side of the sixth lens L6 away from the fifth lens L5 is an image side 13. In the optical system provided in this embodiment, the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter element IRCF are arranged in order from the object side 12 to the image side 13.
The first lens element L1 with positive refractive power has a convex object-side surface S1 along the optical axis and at the circumference, and a convex image-side surface S2 along the optical axis and at the circumference.
The second lens element L2 with negative refractive power is made of plastic material, and has an object-side surface S3 being convex along the optical axis and at the circumference, and an image-side surface S4 being concave along the optical axis and at the circumference.
The third lens element L3 with negative refractive power is made of plastic material, and has a convex object-side surface S5 along the optical axis, a concave object-side surface S5 along the circumference, and a concave image-side surface S6 along the optical axis and the circumference.
The fourth lens element L4 with negative refractive power is made of plastic material, and has a convex object-side surface S7 along the optical axis, a concave object-side surface S7 along the circumference, and a concave image-side surface S8 along the optical axis and the circumference.
The fifth lens element L5 with negative refractive power is made of plastic material, and has a concave object-side surface S9 along the optical axis and at the periphery, a concave image-side surface S10 along the optical axis, and a convex image-side surface S10 along the periphery.
The sixth lens element L6 with positive refractive power is made of plastic material, and has a convex object-side surface S11 along the optical axis, a concave object-side surface S11 along the circumference, and a convex image-side surface S12 along the optical axis and the circumference.
The stop STO may be located between the object side of the optical system and the sixth lens, and the stop STO in the present embodiment is provided on the side of the first lens L1 away from the second lens L2, for controlling the amount of incoming light.
The infrared filter element IRCF is arranged behind the sixth lens L6 and comprises an object side surface S13 and an image side surface S14, the infrared filter element IRCF is used for filtering infrared rays, the rays incident to the image side surface are visible rays, the wavelength of the visible rays is 380nm-780nm, and the infrared filter element IRCF is made of glass.
The image forming surface S15 is a surface on which an image is formed by the light of the subject passing through the optical system.
Table 6a shows a characteristic table of the optical system of the present embodiment, in which the radius of curvature in the present embodiment is the radius of curvature of each lens at the optical axis.
TABLE 6a
Wherein f is an effective focal length of the optical system, FNO is an f-number of the optical system, FOV is a field angle of the optical system in a diagonal direction, and TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical system on an optical axis.
Table 6b shows the high-order term coefficients a4, A6, a8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspherical mirror surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 in the sixth embodiment.
TABLE 6b
Fig. 13 shows a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the sixth embodiment. The longitudinal spherical aberration curve represents the deviation of the convergence focus of the light rays with different wavelengths after passing through each lens of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 13, the optical system according to the sixth embodiment can achieve good image quality.
EXAMPLE seven
As shown in fig. 14, a straight line 11 indicates an optical axis, a side of the first lens L1 away from the second lens L2 is an object side 12, and a side of the sixth lens L6 away from the fifth lens L5 is an image side 13. In the optical system provided in this embodiment, the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter element IRCF are arranged in order from the object side 12 to the image side 13.
The first lens element L1 with positive refractive power has a convex object-side surface S1 along the optical axis and at the periphery, a concave image-side surface S2 along the optical axis, and a convex image-side surface S2 along the periphery.
The second lens element L2 with negative refractive power is made of plastic material, and has an object-side surface S3 being convex along the optical axis and at the circumference, and an image-side surface S4 being concave along the optical axis and at the circumference.
The third lens element L3 with negative refractive power is made of plastic material, and has a convex object-side surface S5 along the optical axis, a concave object-side surface S5 along the circumference, and a concave image-side surface S6 along the optical axis and the circumference.
The fourth lens element L4 with negative refractive power is made of plastic material, and has a convex object-side surface S7 along the optical axis, a concave object-side surface S7 along the circumference, and a concave image-side surface S8 along the optical axis and the circumference.
The fifth lens element L5 with positive refractive power is made of plastic material, and has a concave object-side surface S9 along the optical axis and at the circumference, and a convex image-side surface S10 along the optical axis and at the circumference.
The sixth lens element L6 with negative refractive power is made of plastic material, and has a concave object-side surface S11 along the optical axis and at the circumference, and a convex image-side surface S12 along the optical axis and at the circumference.
The stop STO may be located between the object side of the optical system and the sixth lens, and the stop STO in the present embodiment is provided on the side of the first lens L1 away from the second lens L2, for controlling the amount of incoming light.
The infrared filter element IRCF is arranged behind the sixth lens L6 and comprises an object side surface S13 and an image side surface S14, the infrared filter element IRCF is used for filtering infrared rays, the rays incident to the image side surface are visible rays, the wavelength of the visible rays is 380nm-780nm, and the infrared filter element IRCF is made of glass.
The image forming surface S15 is a surface on which an image is formed by the light of the subject passing through the optical system.
Table 7a shows a characteristic table of the optical system of the present embodiment, in which the radius of curvature in the present embodiment is the radius of curvature of each lens at the optical axis.
TABLE 7a
Wherein f is an effective focal length of the optical system, FNO is an f-number of the optical system, FOV is a field angle of the optical system in a diagonal direction, and TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical system on an optical axis.
Table 7b shows the high-order term coefficients a4, A6, a8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspherical mirror surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 in the seventh embodiment.
TABLE 7b
Fig. 15 shows a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the seventh embodiment. The longitudinal spherical aberration curve represents the deviation of the convergence focus of the light rays with different wavelengths after passing through each lens of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 15, the optical system according to the seventh embodiment can achieve good image quality.
Example eight
As shown in fig. 16, a straight line 11 indicates an optical axis, a side of the first lens L1 away from the second lens L2 is an object side 12, and a side of the sixth lens L6 away from the fifth lens L5 is an image side 13. In the optical system provided in this embodiment, the stop STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter element IRCF are arranged in order from the object side 12 to the image side 13.
The first lens element L1 with positive refractive power has a convex object-side surface S1 along the optical axis and at the circumference, and a convex image-side surface S2 along the optical axis and at the circumference.
The second lens element L2 with negative refractive power is made of plastic material, and has a concave object-side surface S3 along the optical axis, a convex object-side surface S3 along the circumference, and a concave image-side surface S4 along the optical axis and the circumference.
The third lens element L3 with negative refractive power is made of plastic material, and has a convex object-side surface S5 along the optical axis, a concave object-side surface S5 along the circumference, and a concave image-side surface S6 along the optical axis and the circumference.
The fourth lens element L4 with negative refractive power is made of plastic material, and has a convex object-side surface S7 along the optical axis, a concave object-side surface S7 along the circumference, and a concave image-side surface S8 along the optical axis and the circumference.
The fifth lens element L5 with positive refractive power is made of plastic material, and has a concave object-side surface S9 along the optical axis and at the circumference, and a convex image-side surface S10 along the optical axis and at the circumference.
The sixth lens element L6 with negative refractive power is made of plastic material, and has a concave object-side surface S11 along the optical axis and at the circumference, and a convex image-side surface S12 along the optical axis and at the circumference.
The stop STO may be located between the object side of the optical system and the sixth lens, and the stop STO in the present embodiment is provided on the side of the first lens L1 away from the second lens L2, for controlling the amount of incoming light.
The infrared filter element IRCF is arranged behind the sixth lens L6 and comprises an object side surface S13 and an image side surface S14, the infrared filter element IRCF is used for filtering infrared rays, the rays incident to the image side surface are visible rays, the wavelength of the visible rays is 380nm-780nm, and the infrared filter element IRCF is made of glass.
The image forming surface S15 is a surface on which an image is formed by the light of the subject passing through the optical system.
Table 8a shows a characteristic table of the optical system of the present embodiment, in which the radius of curvature in the present embodiment is the radius of curvature of each lens at the optical axis.
TABLE 8a
Wherein f is an effective focal length of the optical system, FNO is an f-number of the optical system, FOV is a field angle of the optical system in a diagonal direction, and TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical system on an optical axis.
Table 8b shows the high-order term coefficients a4, A6, a8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspherical mirror surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 in the eighth embodiment.
TABLE 8b
Fig. 17 shows a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system of the eighth embodiment. The longitudinal spherical aberration curve represents the deviation of the convergence focus of the light rays with different wavelengths after passing through each lens of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 17, the optical system according to the eighth embodiment can achieve good image quality.
Table 9 shows values of ftLtl4/ftGtl4, DL1/Imgh, f/f1, f1/f2, air l3/TTL, (R5 × R6)/(R5+ R6), FBL/TTL, DL/Imgh, TTL/f, and TTL/DL of the optical systems of the first to eighth embodiments.
TABLE 9
As can be seen from table 9, each example satisfies: 1< ftLtl4/ftGtl4<1.5, 0.5< DL1/Imgh <1, 2< f/f1<3, -0.5< f1/f2< -0.2, 0.05< air L3/TTL <0.3, 1mm < (R5. multidot. R6)/(R5+ R6) <4.5mm, FBL/TTL >0.1, 0.5< DL/Imgh <1, 0.7< TTL/f <1, 1.5< TTL/DL < 2.2.
The foregoing is a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations are also regarded as the protection scope of the present application.
Claims (12)
1. An optical system comprising a plurality of lenses, the plurality of lenses comprising, arranged in order from an object side to an image side:
the first lens element with positive refractive power has a convex object-side surface at an optical axis;
the second lens element with negative refractive power has a concave image-side surface at an optical axis;
the third lens element with negative refractive power has a convex object-side surface and a concave image-side surface;
the fourth lens element with negative refractive power has a concave image-side surface at an optical axis;
a fifth lens element with refractive power;
a sixth lens element with refractive power;
the optical system satisfies the following conditional expression:
1<ftLtl4/ftGtl4<1.5，
wherein ftLtl4 is the longest distance from the object side surface of the fourth lens to the image side surface of the fourth lens in a direction parallel to the optical axis, and ftGtl4 is the shortest distance from the object side surface of the fourth lens to the image side surface of the fourth lens in a direction parallel to the optical axis.
2. The optical system according to claim 1, wherein the optical system satisfies the conditional expression:
0.5<DL1/Imgh<1，
DL1 is the effective aperture of the first lens element, and Imgh is half of the diagonal length of the effective pixel area on the imaging plane of the optical system.
3. The optical system according to claim 1, wherein the optical system satisfies the conditional expression:
2<f/f1<3，
wherein f is an effective focal length of the optical system, and f1 is a focal length of the first lens.
4. The optical system according to claim 1, wherein the optical system satisfies the conditional expression:
-0.5<f1/f2<-0.2，
wherein f1 is the focal length of the first lens, and f2 is the focal length of the second lens.
5. The optical system according to claim 1, wherein the optical system satisfies the conditional expression:
0.05<airL3/TTL<0.3，
wherein airL3 is a distance on an optical axis from an image-side surface of the third lens element to an object-side surface of the fourth lens element, and TTL is a distance on the optical axis from an object-side surface of the first lens element to an image plane of the optical system.
6. The optical system according to claim 1, wherein the optical system satisfies the conditional expression:
1mm<(R5*R6)/(R5+R6)<4.5mm，
wherein R5 is a radius of curvature of an object-side surface of the third lens at an optical axis, and R6 is a radius of curvature of an image-side surface of the third lens at the optical axis.
7. The optical system according to claim 1, wherein the optical system satisfies the conditional expression:
FBL/TTL>0.1，
the FBL is a distance between an intersection point of an image side surface of the sixth lens element and an optical axis and an imaging surface on the optical axis, and the TTL is a distance between an object side surface of the first lens element and the imaging surface of the optical system on the optical axis.
8. The optical system according to claim 1, further comprising a stop located on an object side of the first lens or between two adjacent lenses, wherein the optical system satisfies a conditional expression:
0.5<DL/Imgh<1，
DL is the aperture of the diaphragm of the optical system, and Imgh is half of the length of the diagonal line of the effective pixel area of the optical system on an imaging surface.
9. The optical system according to claim 1, further comprising a stop located on an object side of the first lens or between two adjacent lenses, wherein the optical system satisfies a conditional expression:
1.5<TTL/DL<2.2，
wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical system, and DL is an aperture of the diaphragm of the optical system.
10. The optical system according to claim 1, wherein the optical system satisfies the conditional expression:
0.7<TTL/f<1，
wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical system, and f is an effective focal length of the optical system.
11. A lens module comprising the optical system according to any one of claims 1 to 10 and a photosensitive element, wherein the photosensitive element is located on the image side of the optical system.
12. A terminal device characterized by comprising the lens module according to claim 11.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111751963A (en) * | 2020-08-10 | 2020-10-09 | 辽宁中蓝电子科技有限公司 | Small-head large-aperture camera lens |
| CN112394492A (en) * | 2020-12-17 | 2021-02-23 | 天津欧菲光电有限公司 | Optical system, camera module and terminal equipment |
| JP6961318B1 (en) * | 2020-12-21 | 2021-11-05 | エーエーシー オプティックス （ソシュウ） カンパニーリミテッド | Imaging optical lens |
| US20220066169A1 (en) * | 2020-09-03 | 2022-03-03 | Aac Optics (Suzhou) Co., Ltd. | Camera optical lens |
| CN115113366A (en) * | 2022-05-23 | 2022-09-27 | 江西晶超光学有限公司 | Optical system, lens module and electronic equipment |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111751963A (en) * | 2020-08-10 | 2020-10-09 | 辽宁中蓝电子科技有限公司 | Small-head large-aperture camera lens |
| US20220066169A1 (en) * | 2020-09-03 | 2022-03-03 | Aac Optics (Suzhou) Co., Ltd. | Camera optical lens |
| US11892605B2 (en) * | 2020-09-03 | 2024-02-06 | Aac Optics (Suzhou) Co., Ltd. | Camera optical lens |
| CN112394492A (en) * | 2020-12-17 | 2021-02-23 | 天津欧菲光电有限公司 | Optical system, camera module and terminal equipment |
| JP6961318B1 (en) * | 2020-12-21 | 2021-11-05 | エーエーシー オプティックス （ソシュウ） カンパニーリミテッド | Imaging optical lens |
| JP2022098380A (en) * | 2020-12-21 | 2022-07-01 | エーエーシー オプティックス （ソシュウ） カンパニーリミテッド | Image capturing optical lens |
| CN115113366A (en) * | 2022-05-23 | 2022-09-27 | 江西晶超光学有限公司 | Optical system, lens module and electronic equipment |
| CN115113366B (en) * | 2022-05-23 | 2023-12-15 | 江西欧菲光学有限公司 | Optical system, lens module and electronic equipment |
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Address after: 330096 No.699 Tianxiang North Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Applicant after: Jiangxi Jingchao optics Co.,Ltd. Address before: 330096 Jiangxi Nanchang Nanchang hi tech Industrial Development Zone, east of six road, south of Tianxiang Avenue. Applicant before: OFILM TECH Co.,Ltd. |
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