CN111239968A

CN111239968A - Optical system, camera module and electronic device

Info

Publication number: CN111239968A
Application number: CN202010108990.6A
Authority: CN
Inventors: 刘彬彬; 邹海荣; 李明
Original assignee: OFilm Tech Co Ltd
Current assignee: Nanchang OFilm Precision Optical Products Co Ltd; OFilm Group Co Ltd
Priority date: 2020-02-21
Filing date: 2020-02-21
Publication date: 2020-06-05

Abstract

The invention relates to an optical system, a camera module and an electronic device. The optical system includes in order from an object side to an image side: the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; a second lens element with refractive power having a convex object-side surface at paraxial region; a third lens element and a fourth lens element with refractive power; a fifth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a sixth lens element with negative refractive power having a concave image-side surface at paraxial region; the optical system satisfies the relationship: DL/TTL is more than 0.6 and less than 0.75; DL is a distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the sixth lens element, and TTL is a distance on the optical axis from the object-side surface of the first lens element to the image plane of the optical system. When the above relationships are satisfied, the optical system can be miniaturized and the space on the image side of the sixth lens element can be increased.

Description

Optical system, camera module and electronic device

Technical Field

The present invention relates to the field of camera shooting, and in particular, to an optical system, a camera module and an electronic device.

Background

With the popularization of smart phones, the requirements of consumers on the size, the communication capacity, the camera shooting performance and the like of smart phones are gradually improved. Particularly, the size of the camera module directly influences the thickness of devices such as a smart phone, and the oversize size of the camera module directly restricts the miniaturization design of the smart phone. As the module is designed toward miniaturization, many problems of the module during the assembly process are gradually developed, wherein particularly, the axial dimension of the module is too small, so that the components are easily collided during the assembly process, thereby reducing the assembly yield.

Disclosure of Invention

In view of the above, it is necessary to provide an optical system, an image pickup module, and an electronic apparatus, which are directed to the problem of how to maintain the assembly yield while having a compact design.

An optical system comprising, in order from an object side to an image side:

the optical lens assembly comprises a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power;

a second lens element with refractive power having a convex object-side surface at paraxial region;

a third lens element with refractive power;

a fourth lens element with refractive power;

a fifth lens element with positive refractive power having a concave object-side surface and a convex image-side surface;

a sixth lens element with negative refractive power having a concave image-side surface at the paraxial region;

and the optical system satisfies the following relationship:

0.6＜DL/TTL＜0.75；

wherein DL is a distance on an optical axis from an object-side surface of the first lens element to an image-side surface of the sixth lens element, and TTL is a distance on the optical axis from the object-side surface of the first lens element to an image plane of the optical system. When the refractive power, the surface shape and the conditional expression relation of the lens are met, the optical system can be reasonably arranged structurally, so that the space of the system at the image side of the sixth lens can be increased on the basis of reducing the axial size of the system to realize miniaturization design, the arrangement of the module structure end is favorably improved, for example, the assembly of elements such as an optical filter, protective glass and a photosensitive element is favorably realized, the problem that collision is easy to occur between the lens and the element due to the fact that the space at the image side of the sixth lens is too small in the module assembly process is avoided, and the assembly yield of the module at the later stage is improved.

In one embodiment, at least one of the object-side surface and the image-side surface of the first lens to the sixth lens is aspheric.

In one embodiment, the optical system satisfies the following relationship:

0.65＜TTL/(ImgH*2)＜0.8；

wherein, 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 ImgH is a half of a length of a diagonal line of an effective imaging area of the optical system on the imaging surface. When the relation is satisfied, the optical system can be reasonably arranged structurally, so that the ratio of the total optical length of the system to the imaging surface is kept in a smaller range, and the miniaturization design is realized.

In one embodiment, the optical system satisfies the following relationship:

90°＜FOV＜110°；

wherein, the FOV is the maximum field angle of the optical system in the diagonal direction. When the above relation is satisfied, the optical system can satisfy the wide view shooting requirement.

In one embodiment, the optical system satisfies the following relationship:

1.4＜TTL/f＜1.7；

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. When the FOV is more than 90 degrees and the relation is satisfied, the system chromatic aberration, spherical aberration, distortion and other aberrations are favorably balanced to obtain good imaging quality, and the optical system also has shorter total length of the system, so that the optical system can be more easily applied to portable equipment. Namely, the optical system can realize compact and reasonable structural layout and reasonable distribution of refractive power, realize wide-view and miniaturized design and have good imaging quality.

In one embodiment, the optical system satisfies the following relationship:

f1＞0；f26＞0；

wherein f1 is an effective focal length of the first lens, f26 is a combined focal length of the second lens to the sixth lens, and f1 and f26 are both in mm. When the above relation is satisfied, the refractive power of the first lens element and the image side lens assembly (the lens assembly formed by the second lens element to the sixth lens element) can be reasonably arranged, and for large-angle incident light entering the system through the first lens element, the image side lens assembly can effectively balance and correct aberration generated by the incident light and can effectively converge marginal light, and in addition, the compact design of the system on the structure can be ensured, so that the structure size can be effectively compressed, and the system has the characteristics of large wide angle and miniaturization.

In one embodiment, the optical system satisfies the following relationship:

0＜R14/f＜0.5；

wherein R14 is a curvature radius of an image side surface of the sixth lens element at an optical axis, and f is an effective focal length of the optical system. When the relationship is satisfied, the focal length of the sixth lens and the curvature radius of the image side surface can be reasonably configured, so that the surface type complexity of the sixth lens can be reduced, and the effects of inhibiting field curvature and distortion are achieved; meanwhile, the forming difficulty is reduced, the integral image quality is improved, the system back focus can be effectively controlled, and the overlong total length of the system is avoided.

In one embodiment, the optical system satisfies the following relationship:

|f5|+|f6|＜5；

wherein f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f5 and f6 are both in mm. When the above relationship is satisfied, the refractive powers of the fifth lens element and the sixth lens element can be reasonably configured, so as to balance the larger spherical aberration generated by the object side lens assembly (the lens assembly formed by the first lens element to the fourth lens element), thereby improving the overall resolving power of the optical system; meanwhile, the configuration of the refractive power at the rear end of the system can be controlled, and the correction of peripheral aberration of the system is enhanced; it is also advantageous to compress the size of the structure, thereby contributing to a compact design.

In one embodiment, the optical system includes an optical stop disposed between the first lens and the second lens, or disposed between the second lens and the third lens. Through the design, the diaphragm can limit the size of an incident beam to control the light inlet quantity, and can play a role in eliminating aberration, stray light and the like, thereby being beneficial to improving imaging definition.

A camera module comprises a photosensitive element and the optical system, wherein the photosensitive element is arranged on the image side of the optical system. By adopting the optical system, the camera module also has the characteristic of miniaturization, and because the back focal space of the optical system is larger, the collision between the photosensitive element and each lens in the optical system can be effectively avoided in the process of assembling the photosensitive element and each lens in the optical system, so that the assembly yield is improved.

An electronic device comprises a shell and the camera module, wherein the camera module is arranged on the shell. By adopting the camera module with the miniaturization characteristic, the electronic device can assemble the camera module in a smaller space, so that the miniaturization design is facilitated.

Drawings

FIG. 1 is a schematic diagram of an optical system provided in a first embodiment of the present application;

fig. 2 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

FIG. 3 is a schematic view of an optical system provided in a second embodiment of the present application;

fig. 4 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%)' of the optical system in the second embodiment;

FIG. 5 is a schematic view of an optical system provided in a third embodiment of the present application;

fig. 6 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%)' of the optical system in the third embodiment;

FIG. 7 is a schematic view of an optical system provided in a fourth embodiment of the present application;

fig. 8 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%)' of the optical system in the fourth embodiment;

fig. 9 is a schematic view of an optical system provided in a fifth embodiment of the present application;

fig. 10 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

FIG. 11 is a schematic view of an optical system provided in a sixth embodiment of the present application;

fig. 12 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%)' of the optical system in the sixth embodiment;

FIG. 13 is a schematic view of an optical system provided in a seventh embodiment of the present application;

fig. 14 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%)' of the optical system in the seventh embodiment;

fig. 15 is a schematic view of a camera module according to an embodiment of the present application;

fig. 16 is a schematic view of an electronic device according to an embodiment of the disclosure.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, in some embodiments of the present application, the optical system 10 includes, in order from an object side to an image side, a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The first lens element L1 has positive refractive power, the second lens element L2 has positive refractive power or negative refractive power, the third lens element L3 has positive refractive power or negative refractive power, the fourth lens element L4 has positive refractive power or negative refractive power, the fifth lens element L5 has positive refractive power, and the sixth lens element L6 has negative refractive power. The first lens L1 to the sixth lens L6 each include only one lens, and each lens in the optical system 10 is disposed coaxially with the stop STO, that is, the optical axis of each lens and the center of the stop STO are located on the same straight line, which may be referred to as the optical axis of the optical system 10. In other embodiments, stop STO is disposed between second lens L2 and third lens L3. With the above design, the stop STO can limit the size of the incident beam to control the amount of incident light, and can achieve the effects of eliminating aberration, stray light, and the like, thereby being beneficial to improving the imaging definition.

The first lens L1 includes an object side surface S1 and an image side surface S2, the second lens L2 includes an object side surface S3 and an image side surface S4, the third lens L3 includes an object side surface S5 and an image side surface S6, the fourth lens L4 includes an object side surface S7 and an image side surface S8, the fifth lens L5 includes an object side surface S9 and an image side surface S10, and the sixth lens L6 includes an object side surface S11 and an image side surface S12. In addition, the optical system 10 further has an imaging plane S15, the imaging plane S15 is located on the image side of the sixth lens L6, and the incident light can reach the imaging plane S15 after being adjusted by the lenses of the optical system 10. Generally, the image forming surface S15 of the system coincides with the photosensitive surface of the photosensitive element. When the optical system 10 and the photosensitive element are assembled into a module, the image forming surface S15 of the optical system 10 can be regarded as the photosensitive surface of the photosensitive element.

In the above embodiment, the object-side surface S1 of the first lens element L1 is convex, and the image-side surface S2 is concave; the object-side surface S2 of the second lens L2 is convex at the paraxial region; the object-side surface S9 of the fifth lens element L5 is concave, and the image-side surface S10 is convex; the image-side surface S12 of the sixth lens element L6 is concave at the paraxial region. And the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are aspheric, and at least one of the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 has an inflection point. In some embodiments, at least one of the object-side surface and the image-side surface of the first lens L1 through the sixth lens L6 is aspheric, for example, the object-side surface and the image-side surface of each lens in the optical system 10 are aspheric. The aspheric surface design can improve the degree of freedom of lens combination, effectively help the optical system 10 to eliminate aberration, solve the problem of distortion of the field of view, and meanwhile, is beneficial to the miniaturization design of the optical system 10, so that the optical system 10 can have excellent optical performance on the premise of keeping the miniaturization design.

The surface shape of the aspheric surface can be calculated by referring to an aspheric surface formula:

z is the distance from a corresponding point on the aspheric surface to a plane tangent to the surface vertex, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric surface vertex, k is a conical coefficient, and Ai is a coefficient corresponding to the ith high-order term in the aspheric surface type formula.

When the object side surface or the image side surface of a certain lens is an aspheric surface, the surface can be an overall convex surface or an overall concave surface structure; alternatively, the surface may be designed to have a point of inflection, where the surface profile of the surface changes from center to edge, e.g., the surface is convex at the center and concave at the edges. It should be noted that, when the embodiments of the present application describe that one side surface of the lens is convex at the paraxial region (the central region of the side surface), it can be understood that the region of the side surface of the lens near the optical axis is convex, and therefore the side surface can also be considered to be convex at the paraxial region; when one side of the lens is described as being concave at the circumference, it is understood that the side is concave in the region near the maximum effective half aperture. For example, when the side is convex at the paraxial region and also convex at the circumferential region, the shape of the side from the center (optical axis) to the edge direction is purely convex in some embodiments; or first transition from a central convex shape to a concave shape and then become convex near the maximum effective half aperture. Here, the examples are only given to illustrate the relationship between the optical axis and the circumference, and various shapes of the side surfaces (concave-convex relationship) are not fully embodied, but other cases can be derived from the above examples, and should be regarded as what is described in the present application.

In the above embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of plastic, and the plastic lens can reduce the weight of the optical system 10 and reduce the production cost. In some embodiments, the material of each lens in the optical system 10 is glass, and the glass lens is not susceptible to the influence of the environment and is not subject to aging, deformation, and the like, which also makes the imaging performance of the system more stable, so that when the optical system 10 is in an extreme environment such as exposure to high temperature, the design can effectively avoid the situations of the optical system 10 that the imaging quality is reduced and the service life is reduced. Of course, the material arrangement of the lenses in the optical system 10 is not limited to the above-described embodiment.

In some embodiments, the optical system 10 further includes an infrared filter L7, and the infrared filter L7 is disposed on the image side of the sixth lens L6 and is fixed relative to each lens in the optical system 10. The infrared filter L7 includes an object side S13 and an image side S14. The infrared filter L7 is used for filtering infrared light and preventing the infrared light from reaching the imaging surface S15, thereby preventing the infrared light from interfering with normal imaging. An infrared filter L7 may be fitted with each lens as part of the optical system 10. In other embodiments, the infrared filter L7 is not part of the optical system 10, and the infrared filter L7 may be installed between the optical system 10 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into a camera module. In some embodiments, an infrared filter L7 may also be disposed on the object side of the first lens L1. In addition, in some embodiments, the infrared filter L7 may not be provided, and a filter plating layer may be provided on any one of the first lens L1 to the fifth lens L5 to filter infrared light.

In other embodiments, the first lens element L1 may also include two or more lens elements, where the object-side surface of the lens element closest to the object side is the object-side surface S1 of the first lens element L1, and the image-side surface of the lens element closest to the image side is the image-side surface S2 of the first lens element L1. Accordingly, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 in some embodiments are not limited to the case of including only one lens.

In the above embodiment, the optical system 10 satisfies the following relationships:

DL/TTL is more than 0.6 and less than 0.75; DL is an axial distance from the object-side surface S1 of the first lens element L1 to the image-side surface S12 of the sixth lens element L6, and TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical system 10. The DL/TTL in some embodiments is 0.690, 0.695, 0.700, 0.710, 0.720, 0.725, 0.730, or 0.735. When the refractive power, the surface shape and the relationship of the conditional expressions of the lenses in the above embodiments are satisfied, the optical system 10 can be reasonably arranged in structure, so that on the basis of reducing the axial dimension of the system to achieve a miniaturized design, the image-side space of the system on the sixth lens L6 can be increased, thereby facilitating the improvement of the arrangement of the module structure end, for example, facilitating the assembly of the optical filter, the protective glass, the photosensitive element and other elements, and avoiding the problem that the collision between the lens and the element is easily caused by the over-small image-side space of the sixth lens L6 in the module assembly process, so as to improve the assembly yield of the module in the later period.

0.65 < TTL/(ImgH 2) < 0.8; wherein, TTL is the distance from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical system 10 on the optical axis, i.e., the total optical length of the system, and ImgH is half of the diagonal length of the effective image area of the optical system 10 on the image plane S15. TTL/(ImgH × 2) in some embodiments is 0.680, 0.685, 0.690, 0.695, 0.700, 0.705, 0.710, 0.715 or 0.720. When the above relationship is satisfied, the optical system 10 can be reasonably arranged in structure, so that the ratio of the total optical length of the system to the imaging surface S15 is kept within a small range, thereby realizing a miniaturized design.

90 < FOV < 110; wherein, the FOV is the maximum field angle of the optical system 10 in the diagonal direction. The FOV in some embodiments is 92 °, 94 °, 96 °, 98 °, 100 °, 102 °, 104 °, or 106 °. When the above relationship is satisfied, the optical system 10 can satisfy the wide-view imaging requirement.

TTL/f is more than 1.4 and less than 1.7; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical system 10, and f is an effective focal length of the optical system 10. TTL/f in some embodiments is 1.500, 1.510, 1.520, 1.530, 1.540, 1.550, 1.560, 1.570, 1.580, or 1.590. When the FOV > 90 ° and the above relationship are satisfied, it is advantageous to balance aberrations such as chromatic aberration, spherical aberration, and distortion of the system to obtain good imaging quality, and the optical system 10 will have a shorter total system length, so that it can be more easily applied to portable devices. That is, the optical system 10 can achieve a compact and reasonable structural layout and a reasonable distribution of refractive power, achieve a wide-view and miniaturized design, and have good imaging quality.

f1 > 0; f26 > 0; wherein f1 is the effective focal length of the first lens L1, f26 is the combined focal length of the second lens L2 to the sixth lens L6, that is, the combined focal length of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6, and the units of f1 and f26 are both mm. F1 in some embodiments is 6.750, 7.000, 7.500, 8.000, 10.000, 11.000, 13.000, 14.000, 15.000, 16.000, or 16.500. F26 in some embodiments is 2.300, 2.600, 3, 5, 6, 8, 10, 12, 14, 15, 16, 16.500, 17.000, or 17.500. When the above relationship is satisfied, the refractive power of the first lens element L1 and the image side lens assembly (the lens assembly formed by the second lens element L2 to the sixth lens element L6) can be reasonably arranged, and for large-angle incident light entering the system through the first lens element L1, the image side lens assembly can effectively balance and correct aberration generated by the incident light, and can effectively converge marginal light, and in addition, the compact design of the system on the structure can be ensured, so that the structure size can be effectively compressed, and the system has the characteristics of large wide angle and miniaturization.

R14/f is more than 0 and less than 0.5; where R14 is a curvature radius of the image-side surface S12 of the sixth lens element L6 at the optical axis, and f is an effective focal length of the optical system 10. R14/f in some embodiments is 0.210, 0.215, 0.220, 0.230, 0.250, 0.260, 0.270, 0.280, 0.290, or 0.295. When the above relationship is satisfied, the focal length of the sixth lens L6 and the radius of curvature of the image-side surface S12 can be reasonably arranged, so that the surface form complexity of the sixth lens L6 can be reduced, and the effects of suppressing curvature of field and distortion can be achieved; meanwhile, the forming difficulty is reduced, the integral image quality is improved, the system back focus can be effectively controlled, and the overlong total length of the system is avoided.

I f5| + | f6| < 5; where f5 is the effective focal length of the fifth lens L5, f6 is the effective focal length of the sixth lens L6, and f5 and f6 are both in mm. Some embodiments of | f5| + | f6| are 2.450, 2.500, 2.700, 2.900, 3.000, 3.200, 3.500, 3.700, 3.800, or 3.850. When the above relationship is satisfied, the refractive powers of the fifth lens element L5 and the sixth lens element L6 can be reasonably configured, so as to balance the larger spherical aberration generated by the object side lens assembly (the lens assembly formed by the first lens element L1 to the fourth lens element L4), thereby improving the overall resolving power of the optical system 10; meanwhile, the configuration of the refractive power at the rear end of the system can be controlled, and the correction of peripheral aberration of the system is enhanced; it is also advantageous to compress the size of the structure, thereby contributing to a compact design.

The optical system 10 of the present application is described in more detail with reference to the following examples:

first embodiment

Referring to fig. 1 and 2, in the first embodiment, the optical system 10 includes, in order from the object side to the image side, a first lens element L1 with positive refractive power, a stop STO, a second lens element L2 with positive refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, a fifth lens element L5 with positive refractive power, and a sixth lens element L6 with negative refractive power. Fig. 2 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the first embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm. The ordinate of the astigmatism diagram and the distortion diagram can be understood as half the length of the diagonal line of the effective imaging area on the imaging plane S15 of the optical system 10, and the unit of the ordinate is mm.

The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is concave along the optical axis; the object side S1 is convex at the circumference, and the image side S2 is concave at the circumference.

The object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is convex along the optical axis; object side S3 is concave at the circumference, and image side S4 is convex at the circumference.

The object-side surface S5 of the third lens element L3 is concave along the optical axis, and the image-side surface S6 is convex along the optical axis; object side S5 is concave at the circumference, and image side S6 is convex at the circumference.

The object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is concave along the optical axis; object side S7 is concave at the circumference, and image side S8 is convex at the circumference.

The object-side surface S9 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S10 is convex along the optical axis; object side S9 is concave at the circumference, and image side S10 is convex at the circumference.

The object-side surface S11 of the sixth lens element L6 is convex along the optical axis, and the image-side surface S12 is concave along the optical axis; object side S11 is concave at the circumference, and image side S12 is convex at the circumference.

The object-side surface and the image-side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are aspheric, and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 both have an inflection point. By matching the aspherical surface types of the respective lenses in the optical system 10, the problem of distortion of the field of view of the optical system 10 can be effectively solved, and the lenses can exhibit excellent optical effects even when they are small and thin.

In the first embodiment, the optical system 10 satisfies the following relationships:

DL/TTL is 0.684; DL is an axial distance from the object-side surface S1 of the first lens element L1 to the image-side surface S12 of the sixth lens element L6, and TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical system 10. When the refractive power, the surface shape and the relationship of the conditional expressions of the lenses in the above embodiments are satisfied, the optical system 10 can be reasonably arranged in structure, so that on the basis of reducing the axial dimension of the system to achieve a miniaturized design, the image-side space of the system on the sixth lens L6 can be increased, thereby facilitating the improvement of the arrangement of the module structure end, for example, facilitating the assembly of the optical filter, the protective glass, the photosensitive element and other elements, and avoiding the problem that the collision between the lens and the element is easily caused by the over-small image-side space of the sixth lens L6 in the module assembly process, so as to improve the assembly yield of the module in the later period.

TTL/(ImgH × 2) ═ 0.700; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical system 10, and ImgH is a half of a diagonal length of an effective image area of the optical system 10 on the image plane S15. When the above relationship is satisfied, the optical system 10 can be reasonably arranged in structure, so that the ratio of the total optical length of the system to the imaging surface S15 is kept within a small range, thereby realizing a miniaturized design.

FOV is 100 °; wherein, the FOV is the maximum field angle of the optical system 10 in the diagonal direction. When the above relationship is satisfied, the optical system 10 can satisfy the wide-view imaging requirement.

TTL/f is 1.475; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical system 10, and f is an effective focal length of the optical system 10. When the FOV is 100 ° and the above relationship is satisfied, it is beneficial to balance system chromatic aberration, spherical aberration, distortion and other aberrations to obtain good imaging quality, and the optical system 10 will have a shorter total system length, so that it can be more easily applied to portable devices. That is, the optical system 10 can achieve a compact and reasonable structural layout and a reasonable distribution of refractive power, achieve a wide-view and miniaturized design, and have good imaging quality.

f1 is 6.702 mm; f26 is 2.867 mm; wherein f1 is the effective focal length of the first lens L1, f26 is the combined focal length of the second lens L2 to the sixth lens L6, that is, the combined focal length of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6, and the units of f1 and f26 are both mm. When the above relationship is satisfied, the refractive power of the first lens element L1 and the image side lens assembly (the lens assembly formed by the second lens element L2 to the sixth lens element L6) can be reasonably arranged, and for large-angle incident light entering the system through the first lens element L1, the image side lens assembly can effectively balance and correct aberration generated by the incident light, and can effectively converge marginal light, and in addition, the compact design of the system on the structure can be ensured, so that the structure size can be effectively compressed, and the system has the characteristics of large wide angle and miniaturization.

R14/f ═ 0.244; where R14 is a curvature radius of the image-side surface S12 of the sixth lens element L6 at the optical axis, and f is an effective focal length of the optical system 10. When the above relationship is satisfied, the focal length of the sixth lens L6 and the radius of curvature of the image-side surface S12 can be reasonably arranged, so that the surface form complexity of the sixth lens L6 can be reduced, and the effects of suppressing curvature of field and distortion can be achieved; meanwhile, the forming difficulty is reduced, the integral image quality is improved, the system back focus can be effectively controlled, and the overlong total length of the system is avoided.

L f5| + | f6| -2.487 mm; where f5 is the effective focal length of the fifth lens L5, f6 is the effective focal length of the sixth lens L6, and f5 and f6 are both in mm. When the above relationship is satisfied, the refractive powers of the fifth lens element L5 and the sixth lens element L6 can be reasonably configured, so as to balance the larger spherical aberration generated by the object side lens assembly (the lens assembly formed by the first lens element L1 to the fourth lens element L4), thereby improving the overall resolving power of the optical system 10; meanwhile, the configuration of the refractive power at the rear end of the system can be controlled, and the correction of peripheral aberration of the system is enhanced; it is also advantageous to compress the size of the structure, thereby contributing to a compact design.

In addition, each lens parameter of the optical system 10 is given by table 1, table 2, and table 3. Table 2 shows the effective focal lengths of the lenses in table 1, in mm. Table 3 shows aspheric coefficients of the corresponding surfaces of the lenses in table 1, where K is a conic coefficient, Ai is a coefficient corresponding to the i-th higher-order term in the aspheric surface type formula, and table 3 shows an effective focal length of each lens in the optical system 10, and the numerical value is mm. Elements from the object plane to the image plane (the image forming plane S15, which is also understood to be the photosensitive surface of the photosensitive element at the time of later assembly) are arranged in the order of the elements from the top to the bottom in table 1. Surfaces 1 and 2 represent the object-side surface S1 and the image-side surface S2, respectively, of the first lens L1, i.e., the surface with the smaller number is the object-side surface and the surface with the larger number is the image-side surface in the same lens. The Y radius in table 1 is the radius of curvature of the corresponding object-side or image-side surface of the lens at (or understood to be on) the optical axis. The first value of the lens in the "thickness" parameter set is the thickness of the lens on the optical axis, and the second value is the distance from the image-side surface of the lens to the object-side surface of the next lens on the optical axis. The optical axes of the lenses in the embodiment of the present application are on the same straight line as the optical axis of the optical system 10. Note that in the following embodiments, the infrared filter L7 may be used as an element in the optical system 10, or may not be used as an element in the optical system 10.

In the first embodiment, the effective focal length f of the optical system 10 is 2.17mm, the f-number FNO is 2.4, the maximum field angle (i.e., the maximum angle of view in the diagonal direction) FOV is 100 °, the total optical length TTL is 3.2mm, the half ImgH of the diagonal length of the effective imaging area of the optical system 10 on the imaging plane S15 is 2.285mm, the maximum imaging circle diameter MIC on the imaging plane S15 is 4.8mm, and the distance DL of the object-side surface S1 of the first lens L1 to the image-side surface S12 of the sixth lens L6 on the optical axis is 2.19 mm.

In addition, in each of the following examples (first to seventh examples), the refractive index, abbe number, and focal length of each lens are numerical values at a wavelength of 587.6 nm. In addition, the relational expression calculation and the lens structure in the first embodiment are based on the data in tables 1, 2, and 3, and the data in the respective corresponding tables are also based on the other embodiments.

TABLE 1

TABLE 2

TABLE 3

Surface of	1	2	4	5	6	7
							K	1.45247966	6.15370774	-99	-14.384017	-24.143226	-19.215391
A4	-1.60E-01	-0.2079979	-0.2403112	-0.593127	-0.4554257	-0.7428327
							A6	2.22E-01	-0.465163	-0.3234118	-0.0073794	-0.2614438	1.81202085
A8	-5.44E+00	-8.0836078	-1.08E-01	-6.8512046	-6.4852493	-11.735729
							A10	2.66E+01	77.735589	-3.17E+01	3.30E+01	3.87E+01	44.5415143
A12	-71.794748	-403.52366	235.577841	-20.251571	-77.428622	-86.036546
							A14	67.5578684	695.007521	-515.77785	-42.253166	54.7253809	73.6073162
A16	0	0	0	0	0	0
							A18	0	0	0	0	0	0
A20	0	0	0	0	0	0
							Surface of	8	9	10	11	12	13
K	96.4556301	-90.022162	17.8274273	-8.58E-01	-1.17E+02	-4.9966916
							A4	-1.4571049	-1.0863678	-0.3517969	9.69E-01	-3.54E-01	-0.3171725
A6	4.84001298	3.2522258	-0.7381747	-3.48E+00	-1.14E-01	0.40040664
							A8	-24.59535	-9.0898458	8.62279266	1.07E+01	1.47E+00	-0.3552598
A10	7.65E+01	1.82E+01	-33.69497	-2.76E+01	-2.83E+00	0.2121652
							A12	-103.65577	-20.193337	99.0164916	5.89E+01	2.82E+00	-0.085407
A14	51.6739912	9.28694801	-222.63698	-8.62E+01	-1.63E+00	0.02261256
							A16	0	0	332.205137	7.67E+01	5.51E-01	-0.0037226
A18	0	0	-283.02521	-3.67E+01	-1.01E-01	0.00033847
							A20	0	0	1.04E+02	7.24E+00	7.86E-03	-1.26E-05

Second embodiment

Referring to fig. 3 and 4, in the second embodiment, the optical system 10 includes, in order from the object side to the image side, the first lens element L1 with positive refractive power, the stop STO, the second lens element L2 with positive refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. Fig. 4 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the second embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm. The ordinate of the astigmatism diagram and the distortion diagram can be understood as half the length of the diagonal line of the effective imaging area on the imaging plane S15 of the optical system 10, and the unit of the ordinate is mm.

The object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object side S3 is convex at the circumference, and the image side S4 is concave at the circumference.

The object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is concave along the optical axis; the object side S5 is convex at the circumference, and the image side S6 is concave at the circumference.

The object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; object side S7 is concave at the circumference, and image side S8 is convex at the circumference.

The object-side surface S11 of the sixth lens element L6 is concave along the optical axis, and the image-side surface S12 is concave along the optical axis; object side S11 is concave at the circumference, and image side S12 is convex at the circumference.

In addition, the lens parameters of the optical system 10 in the second embodiment are given in tables 4, 5 and 6, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 4

TABLE 5

f1	f2	f3	f4	f5	f6
						16.951524	4.742756	-10.7046	1.154917	2.913101	-0.99251

TABLE 6

The optical system 10 in this embodiment satisfies the following relationship:

TTL/(ImgH*2)	0.750	f1	16.952
				FOV	91	f26	3.438
DL/TTL	0.739	R14/f	0.216
				TTL/f	1.467	\|f5\|+\|f6\|	3.906

third embodiment

Referring to fig. 5 and 6, in the third embodiment, the optical system 10 includes, in order from the object side to the image side, the first lens element L1 with positive refractive power, the stop STO, the second lens element L2 with positive refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. Fig. 6 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the third embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm. The ordinate of the astigmatism diagram and the distortion diagram can be understood as half the length of the diagonal line of the effective imaging area on the imaging plane S15 of the optical system 10, and the unit of the ordinate is mm.

In addition, the lens parameters of the optical system 10 in the third embodiment are given in tables 7, 8 and 9, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 7

TABLE 8

f1	f2	f3	f4	f5	f6
						6.938886	11.53498	4.68066	-4.27949	1.147386	-1.58026

TABLE 9

Surface of	1	2	4	5	6	7
							K	1.79519533	6.1144781	-99	0	-99	-14.916446
A4	-1.92E-01	-0.1584733	-0.1714135	-0.6704231	-0.3280004	-0.7133153
							A6	1.45E+00	0.74523483	-3.7419917	0.4507602	-1.5629961	2.00861095
A8	-1.19E+01	-22.183819	3.76E+01	-12.417897	-3.4571765	-18.988169
							A10	4.53E+01	174.008185	-2.50E+02	4.83E+01	3.79E+01	84.261764
A12	-88.825796	-687.69767	833.777644	-3.077701	-79.977115	-167.76192
							A14	64.8273669	950.017246	-1081.3748	-108.15065	54.0625023	128.161495
A16	0	0	0	0	0	0
							A18	0	0	0	0	0	0
A20	0	0	0	0	0	0
							Surface of	8	9	10	11	12	13
K	82.0959587	-91.811687	17.6840478	-8.73E-01	-5.89E+01	-5.8162863
							A4	-1.4164479	-0.9906283	-0.5230172	1.01E+00	-4.17E-01	-0.3116505
A6	4.3836426	2.77670732	1.80671169	-5.26E+00	4.58E-01	0.4136952
							A8	-23.369789	-7.6728264	-11.09875	2.33E+01	-2.10E-01	-0.4079588
A10	7.71E+01	1.50E+01	59.0461195	-7.41E+01	-1.28E-01	0.27687089
							A12	-107.77996	-16.639125	-178.5425	1.59E+02	1.60E-01	-0.1301789
A14	54.410898	7.88700513	312.828616	-2.15E+02	-3.06E-02	0.04115123
							A16	0	0	-314.85364	1.74E+02	-1.73E-02	-0.0082523
A18	0	0	164.563167	-7.72E+01	7.99E-03	0.00093779
							A20	0	0	-3.23E+01	1.43E+01	-9.17E-04	-4.56E-05

The optical system 10 in this embodiment satisfies the following relationship:

TTL/(ImgH*2)	0.68	f1	6.939
				FOV	106.200	f26	2.280
DL/TTL	0.694	R14/f	0.299
				TTL/f	1.598	\|f5\|+\|f6\|	2.728

fourth embodiment

Referring to fig. 7 and 8, in the fourth embodiment, the optical system 10 includes, in order from the object side to the image side, the first lens element L1 with positive refractive power, the stop STO, the second lens element L2 with positive refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. Fig. 8 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the fourth embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm. The ordinate of the astigmatism diagram and the distortion diagram can be understood as half the length of the diagonal line of the effective imaging area on the imaging plane S15 of the optical system 10, and the unit of the ordinate is mm.

The object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object side S5 is convex at the circumference, and the image side S6 is convex at the circumference.

In addition, the lens parameters of the optical system 10 in the fourth embodiment are given in table 10, table 11 and table 12, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which are not repeated herein.

Watch 10

TABLE 11

f1	f2	f3	f4	f5	f6
						9.616883	34.25749	3.477647	-5.02395	1.145111	-1.395

TABLE 12

The optical system 10 in this embodiment satisfies the following relationship:

TTL/(ImgH*2)	0.691	f1	9.617
				FOV	101.000	f26	7.990
DL/TTL	0.706	R14/f	0.256
				TTL/f	1.505	\|f5\|+\|f6\|	2.540

fifth embodiment

Referring to fig. 9 and 10, in the fifth embodiment, the optical system 10 includes, in order from the object side to the image side, the first lens element L1 with positive refractive power, the stop STO, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. Fig. 10 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the fifth embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm. The ordinate of the astigmatism diagram and the distortion diagram can be understood as half the length of the diagonal line of the effective imaging area on the imaging plane S15 of the optical system 10, and the unit of the ordinate is mm.

In addition, the lens parameters of the optical system 10 in the fifth embodiment are given in tables 13, 14 and 15, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which are not repeated herein.

Watch 13

TABLE 14

f1	f2	f3	f4	f5	f6
						9.4992	-174.318	3.00846	-4.78953	1.139231	-1.25795

Watch 15

The optical system 10 in this embodiment satisfies the following relationship:

TTL/(ImgH*2)	0.722	f1	9.499
				FOV	95.000	f26	17.660
DL/TTL	0.709	R14/f	0.256
				TTL/f	1.454	\|f5\|+\|f6\|	2.397

sixth embodiment

Referring to fig. 11 and 12, in the sixth embodiment, the optical system 10 includes, in order from the object side to the image side, the first lens element L1 with positive refractive power, the stop STO, the second lens element L2 with positive refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. Fig. 12 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the sixth embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm. The ordinate of the astigmatism diagram and the distortion diagram can be understood as half the length of the diagonal line of the effective imaging area on the imaging plane S15 of the optical system 10, and the unit of the ordinate is mm.

The object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is convex along the optical axis; the object side S3 is convex at the circumference, and the image side S4 is convex at the circumference.

The object-side surface S5 of the third lens element L3 is concave along the optical axis, and the image-side surface S6 is concave along the optical axis; object side S5 is concave at the circumference, and image side S6 is convex at the circumference.

The object-side surface S7 of the fourth lens element L4 is convex along the optical axis, and the image-side surface S8 is concave along the optical axis; object side S7 is concave at the circumference, and image side S8 is convex at the circumference.

In addition, the lens parameters of the optical system 10 in the sixth embodiment are given in tables 16, 17 and 18, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which are not repeated herein.

TABLE 16

TABLE 17

f1	f2	f3	f4	f5	f6
						6.736534	3.589181	-3.81857	27.80346	1.174102	-1.41925

Watch 18

Surface of	1	2	4	5	6	7
							K	1.30219071	6.82749104	-94.856741	-14.949537	91.5382903	-92.382473
A4	-2.49E-01	-0.275003	-0.3538981	-0.5046586	-1.3752663	-1.5715883
							A6	5.23E-01	1.16260003	0.49187458	-6.1090925	3.52268996	7.80855733
A8	-4.14E+00	-18.44347	1.12E+01	62.4142392	-16.695228	-32.224862
							A10	8.81E+00	75.179027	-1.65E+02	-3.08E+02	5.07E+01	80.5803082
A12	-22.685647	-210.5013	707.388843	758.58468	-46.003897	-106.20993
							A14	26.4184647	311.272657	-1063.6246	-715.26347	-11.117009	57.0937271
A16	0	0	0	0	0	0
							A18	0	0	0	0	0	0
A20	0	0	0	0	0	0
							Surface of	8	9	10	11	12	13
K	48.1501713	91.6242011	17.5838398	-8.75E-01	-7.12E+01	-4.898979
							A4	-0.8232887	-0.8638911	-0.370809	9.22E-01	-3.39E-01	-0.3341083
A6	0.90503652	2.5030168	-0.8679934	-3.70E+00	-2.99E-01	0.36361449
							A8	0.96745688	-6.4664441	10.3549799	1.50E+01	1.95E+00	-0.2375308
A10	-3.48E+00	1.18E+01	-38.112947	-4.50E+01	-3.60E+00	0.07442807
							A12	3.28371423	-12.183836	83.8304164	9.24E+01	3.57E+00	0.00232453
A14	-0.8756976	5.2267681	-115.98695	-1.20E+02	-2.07E+00	-1.04E-02
							A16	0	0	97.1114535	9.33E+01	7.02E-01	3.63E-03
A18	0	0	-45.59573	-3.91E+01	-1.30E-01	-0.000563
							A20	0	0	1.00E+01	6.75E+00	1.01E-02	3.45E-05

The optical system 10 in this embodiment satisfies the following relationship:

TTL/(ImgH*2)	0.700	f1	6.737
				FOV	102	f26	2.637
DL/TTL	0.700	R14/f	0.230
				TTL/f	1.546	\|f5\|+\|f6\|	2.593

seventh embodiment

Referring to fig. 13 and 14, in the seventh embodiment, the optical system 10 includes, in order from the object side to the image side, the first lens element L1 with positive refractive power, the stop STO, the second lens element L2 with positive refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. Fig. 14 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the seventh embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm. The ordinate of the astigmatism diagram and the distortion diagram can be understood as half the length of the diagonal line of the effective imaging area on the imaging plane S15 of the optical system 10, and the unit of the ordinate is mm.

In addition, the lens parameters of the optical system 10 in the seventh embodiment are given in tables 19, 20 and 21, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which is not repeated herein.

Watch 19

Watch 20

f1	f2	f3	f4	f5	f6
						6.828026	3.477992	-4.26602	-304.361	1.191314	-1.39254

TABLE 21

The optical system 10 in this embodiment satisfies the following relationship:

TTL/(ImgH*2)	0.691	f1	6.828
				FOV	102.5	f26	2.736
DL/TTL	0.696	R14/f	0.205
				TTL/f	1.505	\|f5\|+\|f6\|	2.584

referring to fig. 15, in an embodiment provided in the present application, the optical system 10 and the photosensitive element 210 are assembled to form the image capturing module 20, and the photosensitive element 210 is disposed on the image side of the sixth lens element L6, i.e., on the image side of the optical system 10. An infrared filter L7 and a protective glass are further provided between the fifth lens L5 and the photosensitive element 210 in this embodiment. The photosensitive element 210 is a CCD (Charge Coupled Device) or a CMOS (Complementary Metal oxide semiconductor). By adopting the optical system 10, the detection efficiency of the pixel unit on the photosensitive element 210 to the light from the optical system 10 is effectively improved, so that the imaging quality of the module can be effectively improved. By adopting the optical system 10, the camera module 20 will also have a small-sized feature, and since the back focal space of the optical system 10 is large, collision between the photosensitive element 210 and each lens in the optical system 10 can be effectively avoided in the process of assembling the elements, thereby improving the assembly yield.

In some embodiments, the distance between the photosensitive element 210 and each lens in the optical system 10 is relatively fixed, and the camera module 20 is a fixed focus module. In other embodiments, a driving mechanism such as a voice coil motor may be provided to enable the photosensitive element 210 to move relative to each lens in the optical system 10, so as to achieve a focusing effect. Specifically, a coil electrically connected to the driving chip is disposed on the lens barrel to which the above lenses are assembled, and the image pickup module 20 is further provided with a magnet, so that the lens barrel is driven to move relative to the photosensitive element 210 by a magnetic force between the energized coil and the magnet, thereby achieving a focusing effect. In other embodiments, a similar driving mechanism may be provided to drive a portion of the lenses in the optical system 10 to move, thereby achieving an optical zoom effect.

Referring to fig. 16, some embodiments of the present disclosure further provide an electronic device 30, and the camera module 20 is applied to the electronic device 30 to enable the electronic device 30 to have a camera function. Specifically, the electronic device 30 includes a housing 310, the camera module 20 is mounted on the housing 310, and the housing 310 may be a circuit board, a middle frame, or the like. The electronic device 30 may be, but is not limited to, a smart phone, a smart watch, an e-book reader, a vehicle-mounted camera, a monitoring device, a medical device (such as an endoscope), a tablet computer, a biometric device (such as a fingerprint recognition device or a pupil recognition device), a PDA (Personal Digital Assistant), an unmanned aerial vehicle, and the like. Specifically, in some embodiments, the electronic device 30 is a smart phone, the smart phone includes a middle frame and a circuit board, the circuit board is disposed in the middle frame, the camera module 20 is installed in the middle frame of the smart phone, and the light sensing element 210 is electrically connected to the circuit board. The camera module 20 can be used as a front camera module or a rear camera module of the smart phone. By adopting the camera module 20 having the miniaturization characteristic as described above, the electronic device 30 can assemble the camera module 20 in a smaller space, thereby contributing to a miniaturized design.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An optical system comprising, in order from an object side to an image side:

a third lens element with refractive power;

a fourth lens element with refractive power;

and the optical system satisfies the following relationship:

0.6＜DL/TTL＜0.75；

wherein DL is a distance on an optical axis from an object-side surface of the first lens element to an image-side surface of the sixth lens element, and TTL is a distance on the optical axis from the object-side surface of the first lens element to an image plane of the optical system.

2. The optical system according to claim 1, characterized in that the following relation is satisfied:

0.65＜TTL/(ImgH*2)＜0.8；

wherein, 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 ImgH is a half of a length of a diagonal line of an effective imaging area of the optical system on the imaging surface.

3. The optical system according to claim 1, characterized in that the following relation is satisfied:

90°＜FOV＜110°；

wherein, the FOV is the maximum field angle of the optical system in the diagonal direction.

4. An optical system according to claim 3, characterized in that the following relation is fulfilled:

1.4＜TTL/f＜1.7；

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.

5. The optical system according to claim 1, characterized in that the following relation is satisfied:

f1＞0；f26＞0；

wherein f1 is an effective focal length of the first lens, f26 is a combined focal length of the second lens to the sixth lens, and f1 and f26 are both in mm.

6. The optical system according to claim 1, characterized in that the following relation is satisfied:

0＜R14/f＜0.5；

wherein R14 is a curvature radius of an image side surface of the sixth lens element at an optical axis, and f is an effective focal length of the optical system.

7. The optical system according to claim 1, characterized in that the following relation is satisfied:

|f5|+|f6|＜5；

wherein f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f5 and f6 are both in mm.

8. The optical system according to any one of claims 1 to 7, wherein at least one of an object-side surface and an image-side surface of the first lens to the sixth lens is an aspherical surface.

9. The optical system according to any one of claims 1 to 7, comprising an optical stop disposed between the first lens and the second lens, or between the second lens and the third lens.

10. An image pickup module comprising a photosensitive element and the optical system according to any one of claims 1 to 9, wherein the photosensitive element is disposed on an image side of the optical system.

11. An electronic device, comprising a housing and the camera module of claim 10, wherein the camera module is disposed on the housing.