CN212540848U

CN212540848U - Optical system, image capturing module and electronic equipment

Info

Publication number: CN212540848U
Application number: CN202021459088.0U
Authority: CN
Inventors: 杨健; 李明; 邹海荣
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-02-12
Anticipated expiration: 2030-07-22

Abstract

The utility model relates to an optical system, get for instance module and electronic equipment. 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 and a third lens element with refractive power; a fourth lens element with positive refractive power having a convex image-side surface at paraxial region; a fifth lens element with refractive power having a convex image-side surface at paraxial region; a sixth lens element with refractive power; the seventh lens element with negative refractive power has a concave image-side surface at the paraxial region. The optical system satisfies the conditional expression: SD1/f is less than 0.35; SD1 is half the maximum effective aperture of the object side of the first lens, and f is the total effective focal length of the optical system. When the optical system meets the relational expression, the head of the camera lens can be smaller, and the requirement of full-screen high-screen ratio is met when the lower-screen packaging is adopted.

Description

Optical system, image capturing module and electronic equipment

Technical Field

The utility model relates to a field of making a video recording especially relates to an optical system, gets for instance module and electronic equipment.

Background

With the rapid development of electronic equipment such as a smart phone, the application of the camera lens for under-screen packaging is more and more extensive, and the design of a full-screen can be realized by adopting the under-screen packaging mode, so that the electronic equipment is more attractive. However, in the current electronic device, the head of the camera lens is large, which causes a large opening of the screen when the screen is packaged, and further causes the screen occupation ratio of the screen to be low, thereby affecting the visual effect of the full screen.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide an optical system, an image capturing module and an electronic device for solving the problem that the current camera lens has a large head and affects the visual effect of a full-face screen.

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

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

a second lens element with refractive power;

a third lens element with refractive power;

a fourth lens element with positive refractive power having a convex image-side surface at a paraxial region;

a fifth lens element with refractive power having a convex image-side surface at a paraxial region;

a sixth lens element with refractive power;

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

and the optical system satisfies the following conditional expression:

SD1/f＜0.35；

wherein SD1 is a half of the maximum effective aperture of the object side surface of the first lens, and f is the total effective focal length of the optical system.

In the optical system, the first lens element has positive refractive power, which is beneficial to shortening the total length of the optical system, and the object-side surface of the first lens element is convex at the paraxial region, so that the positive refractive power of the first lens element can be further enhanced, the size of the optical system in the optical axis direction is shortened, and the optical system is beneficial to miniaturization design. When SD1/f is greater than 0.35, the head of the optical system is large, which is not easy to assemble, and when the optical system is used in an electronic device, the opening of the screen is large when the optical system is packaged under the screen, and the screen occupation ratio of the screen is low, which affects the visual effect. When the above conditional expressions are satisfied, the maximum effective aperture of the object-side surface of the first lens and the total effective focal length of the optical system can be reasonably configured, so that the maximum effective aperture of the first lens is smaller, and the camera lens head which is favorable for being manufactured is smaller.

In one embodiment, the optical system satisfies the following conditional expression:

TTL/ImgH＜1.6；

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, that is, a total system length of the optical system, and ImgH is a half of a diagonal length of an effective pixel area of the optical system on the imaging surface. When the conditional expressions are satisfied, the system total length of the optical system and the diagonal length of the effective pixel area of the optical system on the imaging surface can be reasonably configured, so that the system total length of the optical system is shortened, and the requirement of the miniaturization design of the optical system is further satisfied.

1＜f/R14＜4.5；

where f is an overall effective focal length of the optical system, and R14 is a radius of curvature of an image-side surface of the seventh lens at an optical axis. When the conditional expressions are met, the total effective focal length of the optical system and the image side surface of the seventh lens can be reasonably configured, so that the optical system can better match the chief ray incident angle of the inner view field on the photosensitive element, and the imaging quality of the optical system is improved. Wherein the central market to 0.5 field of view of the optical system is the inner field of view of the optical system.

-2＜f1_6/f7＜-0.3；

wherein f1_6 is a combined focal length of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, and f7 is an effective focal length of the seventh lens. When the above conditional expressions are satisfied, the pair f can be aligned₁₆And the values of f7 are reasonably distributed to better correct the chromatic aberration of the optical system and improve the imaging quality of the optical system.

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 a total effective focal length of the optical system. When the condition is satisfied, the total system length and the total effective focal length of the optical system can be reasonably configured, so that the total system length of the optical system is shortened, and the requirement of miniaturization design of the optical system is further satisfied.

tan(FOV/2)＞1；

where FOV is the maximum field angle of the optical system, tan (FOV/2) is the tangent of the maximum half field angle of the optical system. When the conditional expression is satisfied, the optical system has a larger field angle to realize a large-view-angle shooting effect, so that the optical system can acquire information of a shot object to a greater extent, and the shooting experience of a user is improved.

(R2+R1)/(R2-R1)＜5；

wherein R1 is a curvature radius of an object side surface of the first lens at an optical axis, and R2 is a curvature radius of an image side surface of the first lens at the optical axis. When the condition formula is satisfied, the object side surface and the image side surface of the first lens element can be reasonably configured to enhance the positive refractive power of the first lens element, so that the first lens element can better correct chromatic aberration and spherical aberration of the optical system, and the imaging quality of the optical system is improved.

In one embodiment, the object-side surface and the image-side surface of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are aspheric. Due to the adoption of the aspheric structure, the flexibility of lens design can be improved, the spherical aberration of the optical system can be effectively corrected, and the imaging quality of the optical system can be improved.

An image capturing module includes a photosensitive element and the optical system of any of the above embodiments, wherein the photosensitive element is disposed at an image side of the optical system, and light passes through the optical system and forms an image on the photosensitive element. By adopting the optical system in the image capturing module, the maximum effective caliber of the first lens can be smaller, and the head of the camera lens made by the optical system is smaller, so that the image capturing module can meet the requirement of high screen ratio of a full-face screen.

An electronic device comprises a shell and the image capturing module, wherein the image capturing module is arranged on the shell. Adopt above-mentioned getting for instance module among the electronic equipment, camera lens head among the electronic equipment is less, can satisfy the requirement that the high screen of full face accounts for the ratio.

Drawings

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

FIG. 2 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system according to a first embodiment of the present application;

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

FIG. 4 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system in a second embodiment of the present application;

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

FIG. 6 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system in a third embodiment of the present application;

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

FIG. 8 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system according to a fourth embodiment of the present application;

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

FIG. 10 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system according to a fifth embodiment of the present application;

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

FIG. 12 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system in a sixth embodiment of the present application;

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

FIG. 14 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system according to a seventh embodiment of the present application;

FIG. 15 is a schematic view of an optical system in an eighth embodiment of the present application;

FIG. 16 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system according to an eighth embodiment of the present application;

fig. 17 is a schematic view of an image capturing module according to an embodiment of the present application;

fig. 18 is a schematic diagram of an electronic device in an embodiment of the present application.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" 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. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

In some embodiments of the present disclosure, referring to fig. 1, the optical system 100 includes, in order from an object side to an image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. Specifically, 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, the sixth lens L6 includes an object-side surface S11 and an image-side surface S12, and the seventh lens L7 includes an object-side surface S13 and an image-side surface S14. The optical system 100 can be provided in a lens barrel to be assembled to form an imaging lens.

The first lens element L1 with positive refractive power helps to shorten the total length of the optical system 100, and the object-side surface S1 of the first lens element L1 is convex at the paraxial region, so that the positive refractive power of the first lens element L1 can be further enhanced, the dimension of the optical system 100 in the optical axis direction can be shortened, and the optical system 100 can be miniaturized. The image-side surface S2 of the first lens element L1 is concave at the paraxial region. The second lens element L2 and the third lens element L3 both have refractive power. The fourth lens element L4 with positive refractive power has a convex paraxial region with the image-side surface S8 of the fourth lens element L4. The fifth lens element with refractive power has a convex paraxial surface S10 of the fifth lens element L5. The sixth lens element L6 has refractive power. The seventh lens element L7 with negative refractive power has a concave image-side surface S14 at the paraxial region of the seventh lens element L7.

In addition, in some embodiments, the optical system 100 is provided with a stop STO, which may be disposed on the object side of the first lens L1. In some embodiments, the optical system 100 further includes an infrared filter L8 disposed on the image side of the seventh lens L7, and the infrared filter L8 includes an object-side surface S15 and an image-side surface S16. Furthermore, the optical system 100 further includes an image plane S17 located on the image side of the seventh lens L7, the image plane S17 is an imaging plane of the optical system 100, and incident light is adjusted by 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 seventh lens L7 and can be imaged on the image plane S17. It should be noted that the infrared filter L8 may be an infrared cut filter, and is used for filtering the interference light and preventing the interference light from reaching the image plane S17 of the optical system 100 to affect the normal imaging.

In some embodiments, the object-side surface and the image-side surface of each lens of optical system 100 are both aspheric. The adoption of the aspheric surface structure can improve the flexibility of lens design, effectively correct spherical aberration and improve imaging quality. In other embodiments, the object-side surface and the image-side surface of each lens of the optical system 100 may be spherical. It should be noted that the above embodiments are only examples of some embodiments of the present application, and in some embodiments, the surface of each lens in the optical system 100 may be an aspheric surface or any combination of spherical surfaces.

In some embodiments, each lens in the optical system 100 may be made of glass or plastic. The use of the plastic lens can reduce the weight and production cost of the optical system 100, and the optical system can be designed to be small in size in cooperation with the small size of the optical system. The glass lens provides the optical system 100 with excellent optical performance and high temperature resistance. It should be noted that the material of each lens in the optical system 100 may be any combination of glass and plastic, and is not necessarily both glass and plastic.

It is to be noted that the first lens L1 does not mean that there is only one lens, and in some embodiments, there may be two or more lenses in the first lens L1, and the two or more lenses can form a cemented lens, and a surface of the cemented lens closest to the object side can be regarded as the object side surface S1, and a surface of the cemented lens closest to the image side can be regarded as the image side surface S2. Alternatively, although no cemented lens is formed between the lenses of the first lens L1, the distance between the lenses is relatively fixed, and in this case, the object-side surface of the lens closest to the object side is the object-side surface S1, and the image-side surface of the lens closest to the image side is the image-side surface S2. In addition, the number of lenses in the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 or the seventh lens L7 in some embodiments may be greater than or equal to two, and a cemented lens may be formed between any two adjacent lenses, or a non-cemented lens may be used.

Further, in some embodiments, the optical system 100 satisfies the conditional expression: SD1/f is less than 0.35; where SD1 is half of the maximum effective aperture of the object-side surface S1 of the first lens L1, and f is the total effective focal length of the optical system 100. Specifically, SD1/f may be 0.22, 0.23, 0.24, 0.25, or 0.26. When SD1/f is greater than 0.35, the head of the optical system 100 is large, which is not easy to assemble, and when the optical system is used in an electronic device, the opening of the screen is large when the optical system is packaged under the screen, which results in a low screen occupation ratio of the screen and affects the visual effect. When the above conditional expressions are satisfied, the maximum effective aperture of the object-side surface S1 of the first lens L1 and the total effective focal length of the optical system 100 can be configured reasonably, so that the maximum effective aperture of the first lens L1 is small, which is favorable for making a small head of the imaging lens.

In some embodiments, the optical system 100 satisfies the conditional expression: TTL/ImgH is less than 1.6; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane of the optical system 100, i.e., a total system length of the optical system 100, and ImgH is a half of a diagonal length of an effective pixel area of the optical system 100 on the image plane. Specifically, TTL/ImgH can be 1.41, 1.42, 1.43, 1.44, 1.45, 1.46, 1.47, 1.48, 1.49, or 1.51. When the above conditional expressions are satisfied, the system total length of the optical system 100 and the diagonal length of the effective pixel area of the optical system 100 on the imaging plane can be reasonably configured, so as to shorten the system total length of the optical system 100, and further satisfy the requirement of the miniaturization design of the optical system 100.

In some embodiments, the optical system 100 satisfies the conditional expression: f/R14 is more than 1 and less than 4.5; where f is the total effective focal length of the optical system 100, and R14 is the radius of curvature of the image-side surface S14 of the seventh lens L7 at the optical axis. Specifically, f/R14 may be 2.64, 2.71, 2.77, 2.85, 2.94, 3.10, 3.21, 3.48, 3.51, or 3.55. When the above conditional expressions are satisfied, the total effective focal length of the optical system 100 and the image side surface S14 of the seventh lens L7 can be reasonably configured, so that the optical system 100 can better match the chief ray incident angle of the internal field on the photosensitive element, and further the imaging quality of the optical system 100 is improved.

In some embodiments, the optical system 100 satisfies the conditional expression: -2 < f1 — 6/f7 < -0.3; where f1_6 is a combined focal length 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, and f7 is an effective focal length of the seventh lens L7. In particular, f₁₆The/f 7 can be-1.35, -1.24, -1.18, -1.13, -1.09, -1.01, -0.95, -0.83, -0.79 or-0.77. When the above conditional expressions are satisfied, the pair f can be aligned₁₆And the values of f7 are reasonably distributed to better correct the chromatic aberration of the optical system 100 and improve the imaging quality of the optical system 100.

In some embodiments, the optical system 100 satisfies the conditional expression: TTL/f is 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 of the optical system 100, and f is a total effective focal length of the optical system 100. Specifically, TTL/f can be 1.56, 1.57, 1.58, 1.61, 1.62, 1.63, 1.65, 1.67, 1.68, or 1.69. When the above conditional expressions are satisfied, the total system length and the total effective focal length of the optical system 100 can be reasonably configured to shorten the total system length of the optical system 100, thereby satisfying the requirement of the miniaturization design of the optical system 100.

In some embodiments, the optical system 100 satisfies the conditional expression: tan (FOV/2) > 1; where FOV is the maximum angle of view of the optical system 100, that is, tan (FOV/2) is the tangent of the maximum half angle of view of the optical system 100. Specifically, the tan (FOV/2) may be 1.25, 1.26, 1.27, or 1.28. When the above conditional expressions are satisfied, the optical system 100 has a large field angle to realize a large-field-angle shooting effect, so that the optical system 100 can acquire information of a shot object to a greater extent, and the shooting experience of a user is improved.

In some embodiments, the optical system 100 satisfies the conditional expression: (R2+ R1)/(R2-R1) < 5; wherein R1 is a radius of curvature of the object-side surface S1 of the first lens element L1 at the optical axis, and R2 is a radius of curvature of the image-side surface S2 of the first lens element L1 at the optical axis. Specifically, (R2+ R1)/(R2-R1) may be 1.91, 1.98, 2.02, 2.06, 2.15, 2.26, 2.32, 2.47, 2.56 or 2.67. When the above conditional expressions are satisfied, the object-side surface S1 and the image-side surface S2 of the first lens element L1 can be reasonably disposed to enhance the positive refractive power of the first lens element L1, so that the first lens element L1 can better correct the chromatic aberration and spherical aberration of the optical system 100, and improve the imaging quality of the optical system 100.

Based on the above description of the embodiments, more specific embodiments and drawings are set forth below for detailed description.

First embodiment

Referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of the optical system 100 in the first embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, and a seventh lens element L7 with negative refractive power. Fig. 2 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the first embodiment sequentially from left to right, wherein the reference wavelengths of the astigmatism graph and the distortion graph are 555nm, and the other embodiments are the same.

The object-side surface S1 of the first lens element L1 is convex at the paraxial region and convex at the peripheral region;

the image-side surface S2 of the first lens element L1 is concave at the paraxial region and convex at the peripheral region;

the object-side surface S3 of the second lens element L2 is convex at the paraxial region and convex at the peripheral region;

the image-side surface S4 of the second lens element L2 is convex at the paraxial region and concave at the peripheral region;

the object-side surface S5 of the third lens element L3 is convex at the paraxial region and concave at the peripheral region;

the image-side surface S6 of the third lens element L3 is concave at the paraxial region and convex at the peripheral region;

the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region and concave at the peripheral region;

the image-side surface S8 of the fourth lens element L4 is convex at the paraxial region and concave at the peripheral region;

the object-side surface S9 of the fifth lens element L5 is concave at the paraxial region and concave at the peripheral region;

the image-side surface S10 of the fifth lens element L5 is convex at the paraxial region and convex at the peripheral region;

the object-side surface S11 of the sixth lens element L6 is convex at the paraxial region and convex at the peripheral region;

the image-side surface S12 of the sixth lens element L6 is concave at the paraxial region and concave at the peripheral region;

the object-side surface S13 of the seventh lens element L7 is convex at the paraxial region and convex at the peripheral region;

the image-side surface S14 of the seventh lens element L7 is concave at the paraxial region and concave at the peripheral region.

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, the sixth lens L6, and the seventh lens L7 are aspheric.

It should be noted that, in the present application, when a surface of a lens is described as being convex at a paraxial region (a central region of the side surface), it is understood that a region of the surface of the lens near an optical axis is convex. When a surface of a lens is described as concave at the circumference, it is understood that the surface is concave near the region of maximum effective radius. For example, when the surface is convex at the optical axis and also convex at the circumference, the shape of the surface from the center (optical axis) to the edge direction may be purely convex; or a convex shape at the center is firstly transited to a concave shape, and then becomes a convex shape near the maximum effective radius. Here, examples are made only to illustrate the relationship at the optical axis and at the circumference, and various shape structures (concave-convex relationship) of the surface are not fully embodied, but other cases can be derived from the above examples.

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 seventh lens L7 are all made of plastic.

Further, the optical system 100 satisfies the conditional expression: SD1/f is 0.22; where SD1 is half of the maximum effective aperture of the object-side surface S1 of the first lens L1, and f is the total effective focal length of the optical system 100. When SD1/f is greater than 0.35, the head of the optical system 100 is large, which is not easy to assemble, and when the optical system is used in an electronic device, the opening of the screen is large when the optical system is packaged under the screen, which results in a low screen occupation ratio of the screen and affects the visual effect. When the above conditional expressions are satisfied, the maximum effective aperture of the object-side surface S1 of the first lens L1 and the total effective focal length of the optical system 100 can be configured reasonably, so that the maximum effective aperture of the first lens L1 is small, which is favorable for making a small head of the imaging lens.

The optical system 100 satisfies the conditional expression: TTL/ImgH is 1.41; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane of the optical system 100, i.e., a total system length of the optical system 100, and ImgH is a half of a diagonal length of an effective pixel area of the optical system 100 on the image plane. When the above conditional expressions are satisfied, the system total length of the optical system 100 and the diagonal length of the effective pixel area of the optical system 100 on the imaging plane can be reasonably configured, so as to shorten the system total length of the optical system 100, thereby satisfying the requirement of the miniaturization design of the optical system 100.

The optical system 100 satisfies the conditional expression: f/R14 ═ 3.39; where f is the total effective focal length of the optical system 100, and R14 is the radius of curvature of the image-side surface S14 of the seventh lens L7 at the optical axis. When the above conditional expressions are satisfied, the total effective focal length of the optical system 100 and the image side surface S14 of the seventh lens L7 can be reasonably configured, so that the optical system 100 can better match the chief ray incident angle of the internal field on the photosensitive element, and further the imaging quality of the optical system 100 is improved.

The optical system 100 satisfies the conditional expression: f1 — 6/f7 ═ 0.77; where f1_6 is a combined focal length 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, and f7 is an effective focal length of the seventh lens L7. When the above conditional expressions are satisfied, the pair f can be aligned₁₆And the values of f7 are reasonably distributed to better correct the chromatic aberration of the optical system 100 and improve the imaging quality of the optical system 100.

The optical system 100 satisfies the conditional expression: TTL/f is 1.56; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane of the optical system 100, and f is a total effective focal length of the optical system 100. When the above conditional expressions are satisfied, the total system length and the total effective focal length of the optical system 100 can be reasonably configured to shorten the total system length of the optical system 100, thereby satisfying the requirement of the miniaturization design of the optical system 100.

The optical system 100 satisfies the conditional expression: tan (FOV/2) ═ 1.26; where FOV is the maximum angle of view of the optical system 100, that is, tan (FOV/2) is the tangent of the maximum half angle of view of the optical system 100. When the above conditional expressions are satisfied, the optical system 100 has a large field angle to realize a large-field-angle shooting effect, so that the optical system 100 can acquire information of a shot object to a greater extent, and the shooting experience of a user is improved.

The optical system 100 satisfies the conditional expression: (R2+ R1)/(R2-R1) ═ 2.35; wherein R1 is a radius of curvature of the object-side surface S1 of the first lens element L1 at the optical axis, and R2 is a radius of curvature of the image-side surface S2 of the first lens element L1 at the optical axis. When the above conditional expressions are satisfied, the object-side surface S1 and the image-side surface S2 of the first lens element L1 can be reasonably disposed to enhance the positive refractive power of the first lens element L1, so that the first lens element L1 can better correct the chromatic aberration and spherical aberration of the optical system 100, and improve the imaging quality of the optical system 100.

In addition, the parameters of the optical system 100 are given in table 1. Among them, the image plane S17 in table 1 may be understood as an imaging plane of the optical system 100. The elements from the object plane (not shown) to the image plane S17 are sequentially arranged in the order of the elements from top to bottom in table 1. The Y radius in table 1 is the radius of curvature of the object-side surface or the image-side surface of the corresponding surface number at the optical axis. Surface number 1 and surface number 2 are the object-side surface S1 and the image-side surface S2 of the first lens L1, respectively, that is, in the same lens, the surface with the smaller surface number is the object-side surface, and the surface with the larger surface number is the image-side surface. The first numerical value in the "thickness" parameter column of the first lens element L1 is the axial thickness of the lens element, and the second numerical value is the axial distance from the image-side surface of the lens element to the object-side surface of the following lens element in the image-side direction.

Note that, in this embodiment and the following embodiments, the optical system 100 may not be provided with the infrared filter L8, but the distance from the image-side surface S14 of the seventh lens L7 to the image surface S17 is kept constant at this time.

In the first embodiment, the total effective focal length f of the optical system 100 is 2.75mm, the f-number FNO is 2.30, the maximum field angle FOV is 103.28 °, and the total system length TTL of the optical system 100 is 4.30 mm.

The focal length of each lens was a value at a wavelength of 555nm, and the refractive index and Abbe number of each lens were values at d-line (587.56nm), and the same applies to other examples.

TABLE 1

Further, aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given by table 2. In which the surface numbers 1-14 represent image side surfaces or object side surfaces S1-S14, respectively. And K-a20 from top to bottom respectively indicate the types of aspheric coefficients, where K indicates a conic coefficient, a4 indicates a quartic aspheric coefficient, a6 indicates a sextic aspheric coefficient, A8 indicates an octal aspheric coefficient, and so on. In addition, the aspherical surface coefficient formula is as follows:

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.

TABLE 2

Second embodiment

Referring to fig. 3 and 4, fig. 3 is a schematic diagram of the optical system 100 in the second embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, and a seventh lens element L7 with negative refractive power. Fig. 4 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the second embodiment, from left to right.

The object-side surface S1 of the first lens element L1 is convex at the paraxial region and concave at the peripheral region;

the object-side surface S3 of the second lens element L2 is concave at the paraxial region and convex at the peripheral region;

the object-side surface S5 of the third lens element L3 is concave at the paraxial region and convex at the peripheral region;

the image-side surface S6 of the third lens element L3 is concave at the paraxial region and concave at the peripheral region;

the image-side surface S8 of the fourth lens element L4 is convex at the paraxial region and convex at the peripheral region;

In addition, the parameters of the optical system 100 are given in table 3, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein.

TABLE 3

Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 4, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 4

Furthermore, according to the provided parameter information, the following relationship can be deduced:

third embodiment

Referring to fig. 5 and 6, fig. 5 is a schematic diagram of the optical system 100 in the third embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with positive refractive power, and a seventh lens element L7 with negative refractive power. Fig. 6 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the third embodiment, from left to right.

the object-side surface S5 of the third lens element L3 is convex at the paraxial region and convex at the peripheral region;

the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region and convex at the peripheral region;

the image-side surface S12 of the sixth lens element L6 is convex at the paraxial region and concave at the peripheral region;

the object-side surface S13 of the seventh lens element L7 is concave at the paraxial region and convex at the peripheral region;

In addition, the parameters of the optical system 100 are given in table 5, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein again.

TABLE 5

Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 6, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 6

fourth embodiment

Referring to fig. 7 and 8, fig. 7 is a schematic diagram of the optical system 100 in the fourth embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with positive refractive power, and a seventh lens element L7 with negative refractive power. Fig. 8 is a graph showing the spherical aberration, astigmatism and distortion of the optical system 100 in the fourth embodiment in order from left to right.

the image-side surface S10 of the fifth lens element L5 is convex at the paraxial region and concave at the peripheral region;

the image-side surface S12 of the sixth lens element L6 is concave at the paraxial region and convex at the peripheral region;

In addition, the parameters of the optical system 100 are given in table 7, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein.

TABLE 7

Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 8, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 8

fifth embodiment

Referring to fig. 9 and 10, fig. 9 is a schematic diagram of the optical system 100 in the fifth embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with positive refractive power, and a seventh lens element L7 with negative refractive power. Fig. 10 is a graph showing the spherical aberration, astigmatism and distortion of the optical system 100 in the fifth embodiment in order from left to right.

the object-side surface S3 of the second lens element L2 is concave at the paraxial region and concave at the peripheral region;

In addition, the parameters of the optical system 100 are given in table 9, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein.

TABLE 9

Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 10, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

Watch 10

sixth embodiment

Referring to fig. 11 and 12, fig. 11 is a schematic diagram of the optical system 100 in the sixth embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with positive refractive power, and a seventh lens element L7 with negative refractive power. Fig. 12 is a graph showing the spherical aberration, astigmatism and distortion of the optical system 100 in the sixth embodiment in order from left to right.

the object-side surface S3 of the second lens element L2 is convex at the paraxial region and concave at the peripheral region;

the object-side surface S7 of the fourth lens element L4 is convex at the paraxial region and convex at the peripheral region;

the object-side surface S9 of the fifth lens element L5 is convex at the paraxial region and convex at the peripheral region;

the object-side surface S11 of the sixth lens element L6 is concave at the paraxial region and concave at the peripheral region;

the object-side surface S13 of the seventh lens element L7 is concave at the paraxial region and concave at the peripheral region;

the image-side surface S14 of the seventh lens element L7 is concave at the paraxial region and convex at the peripheral region.

In addition, the parameters of the optical system 100 are given in table 11, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein.

TABLE 11

Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given in table 12, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 12

seventh embodiment

Referring to fig. 13 and 14, fig. 13 is a schematic diagram of the optical system 100 in the seventh embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, and a seventh lens element L7 with negative refractive power. Fig. 14 is a graph showing the spherical aberration, astigmatism and distortion of the optical system 100 in the seventh embodiment in order from left to right.

the image-side surface S4 of the second lens element L2 is concave at the paraxial region and concave at the peripheral region;

the image-side surface S6 of the third lens element L3 is convex at the paraxial region and concave at the peripheral region;

the object-side surface S9 of the fifth lens element L5 is concave at the paraxial region and convex at the peripheral region;

In addition, the parameters of the optical system 100 are given in table 13, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein.

Watch 13

Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given in table 14, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 14

eighth embodiment

Referring to fig. 15 and 16, fig. 15 is a schematic diagram of the optical system 100 in the eighth embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, and a seventh lens element L7 with negative refractive power. Fig. 16 is a graph showing the spherical aberration, astigmatism and distortion of the optical system 100 in the eighth embodiment in the order from left to right.

the image-side surface S4 of the second lens element L2 is concave at the paraxial region and convex at the peripheral region;

In addition, the parameters of the optical system 100 are given in table 15, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein.

Watch 15

Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 16, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 16

referring to fig. 17, in some embodiments, the optical system 100 may be assembled with the photosensitive element 210 to form the image capturing module 200. At this time, the light-sensing surface of the light-sensing element 210 may be regarded as the image surface S17 of the optical system 100. The image capturing module 200 may further include an infrared filter L8, and the infrared filter L8 is disposed between the image side surface S14 and the image surface S17 of the seventh lens element L7. Specifically, the photosensitive element 210 may be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) Device. By adopting the optical system 100 in the image capturing module 200, the maximum effective aperture of the first lens L1 can be made smaller, and the head of the camera lens made by the optical system 100 is made smaller. Therefore, when the camera lens is arranged in the electronic equipment in a screen-down packaging mode, the opening of the screen of the electronic equipment is small, the screen occupation ratio of the electronic equipment is improved, and the requirement of full-screen high screen occupation ratio is met.

Referring to fig. 17 and 18, in some embodiments, the image capturing module 200 may be applied to an electronic device 300, the electronic device includes a housing 310, and the image capturing module 200 is disposed in the housing 310. Specifically, the electronic apparatus 300 may be, but is not limited to, a wearable device such as a mobile phone, a video phone, a smart phone, an electronic book reader, a vehicle-mounted image capturing apparatus such as a car recorder, or a smart watch. Adopt in electronic equipment 300 and get for instance module 200, because the camera lens head that gets for instance module 200 made is less, when adopting the mode installation of encapsulating under the screen, electronic equipment 300's screen trompil is less, can satisfy the requirement that the high screen of full face accounts for the ratio.

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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

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

a second lens element with refractive power;

a third lens element with refractive power;

a sixth lens element with refractive power;

and the optical system satisfies the following conditional expression:

SD1/f＜0.35；

2. The optical system according to claim 1, wherein the following conditional expression is satisfied:

TTL/ImgH＜1.6；

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 pixel area of the optical system on the imaging surface.

3. The optical system according to claim 1, wherein the following conditional expression is satisfied:

1＜f/R14＜4.5；

where f is an overall effective focal length of the optical system, and R14 is a radius of curvature of an image-side surface of the seventh lens at an optical axis.

4. The optical system according to claim 1, wherein the following conditional expression is satisfied:

-2＜f1_6/f7＜-0.3；

wherein f1_6 is a combined focal length of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, and f7 is an effective focal length of the seventh lens.

5. The optical system according to claim 1, wherein the following conditional expression is satisfied:

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 a total effective focal length of the optical system.

6. The optical system according to claim 1, wherein the following conditional expression is satisfied:

tan(FOV/2)＞1；

wherein the FOV is a maximum field angle of the optical system.

7. The optical system according to claim 1, wherein the following conditional expression is satisfied:

(R2+R1)/(R2-R1)＜5；

wherein R1 is a curvature radius of an object side surface of the first lens at an optical axis, and R2 is a curvature radius of an image side surface of the first lens at the optical axis.

8. The optical system according to claim 1, wherein object-side surfaces and image-side surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are aspheric.

9. An image capturing module, comprising a photosensitive element and the optical system of any one of claims 1 to 8, wherein the photosensitive element is disposed on an image side of the optical system, and light passes through the optical system and forms an image on the photosensitive element.

10. An electronic device, comprising a housing and the image capturing module of claim 9, wherein the image capturing module is disposed on the housing.