CN211786331U

CN211786331U - Optical system, image capturing module and electronic equipment

Info

Publication number: CN211786331U
Application number: CN202020499321.1U
Authority: CN
Inventors: 邹金华; 李明; 邹海荣
Original assignee: OFilm Tech Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2020-10-27
Anticipated expiration: 2030-04-08

Abstract

The utility model relates to an optical system, get for instance module and electronic equipment. The optical system comprises a first lens with positive refractive power from an object side to an image side in sequence; a second lens element with refractive power; the third lens element with negative refractive power has concave object-side and image-side surfaces at the periphery; a fourth lens element with negative refractive power; the fifth lens element with positive refractive power has an object-side surface and an image-side surface which are both aspheric, and at least one of the object-side surface and the image-side surface has an inflection point; a sixth lens element with negative refractive power. The optical system satisfies: CT1/SD11 is more than 0.60 and less than 1.01; TTL/CT1 is more than 5.5 and less than 9.0; CT1 is the thickness of the first lens element on the optical axis, SD11 is half of the maximum effective aperture of the object-side surface of the first lens element, and TTL is the distance from the object-side surface of the first lens element to the image plane of the optical system. The optical system can make the head of the camera lens smaller, and meets the requirement of miniaturization design of electronic equipment.

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 continuous development of electronic devices such as smart phones and tablet computers, the camera function has become an indispensable function in the electronic devices, and the volume of the electronic devices is more and more biased to miniaturization, and higher requirements are also put forward on the size of an optical system in the electronic devices. However, the head of the current imaging lens is usually large, and it is difficult to meet the demand for miniaturization design of electronic devices.

SUMMERY OF THE UTILITY MODEL

Accordingly, it is necessary to provide an optical system, an image capturing module and an electronic apparatus for solving the problem that the camera lens head is large and the requirement of miniaturization design of the electronic apparatus is difficult to meet.

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

a first lens element with positive refractive power;

a second lens element with refractive power;

a third lens element with negative refractive power having a concave object-side surface and a concave image-side surface at the periphery;

a fourth lens element with negative refractive power;

a fifth lens element with positive refractive power having an inflection point on at least one of an object-side surface and an image-side surface thereof;

a sixth lens element with negative refractive power;

and the optical system satisfies the following relation:

0.60＜CT1/SD11＜1.01；

5.5＜TTL/CT1＜9.0；

wherein CT1 is a thickness of the first lens element on an optical axis, SD11 is a half of a maximum effective aperture of an object-side surface of the first 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.

The optical system satisfies the following relation: and when the CT1/SD11 is more than 0.60 and less than 1.01, the first lens can be reasonably arranged, so that the head of the camera lens is smaller, and the requirement of miniaturization design of electronic equipment is met. And satisfies the relation: when TTL/CT1 is more than 5.5 and less than 9.0, the system total length of the first lens and the optical system can be reasonably configured, the head of the camera lens is enabled to be small, the system total length of the optical system can be enabled to be small, and the requirement of miniaturization design of electronic equipment is further met. Meanwhile, the first lens can be ensured to have enough thickness, so that the processing forming yield of the first lens is higher, and the assembly yield of the optical system is further improved.

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

2.2≤FNO≤2.6；

wherein FNO is an f-number of the optical system. When the above relational expression is satisfied, it is advantageous to make the head of the imaging lens smaller while ensuring that the optical system has a sufficient light flux.

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

1＜f3/f4＜10；

wherein f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens. When the relational expression is satisfied, the third lens and the fourth lens can be reasonably configured to effectively enlarge the field angle of the optical system, further shorten the total length of the optical system, and satisfy the requirement of miniaturization design.

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

2.0＜f4/f1+f5/f6＜4.0；

wherein f1 is the effective focal length of the first lens, and f4 is the effective focal length of the fourth lens; f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. When the above relational expression is satisfied, the refractive powers of the first lens element, the fourth lens element, the fifth lens element and the sixth lens element can be reasonably configured, so that the positive spherical aberration and the negative spherical aberration of the optical system can be balanced with each other, and the imaging quality of the optical system can be improved.

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

1.0＜f/f12＜1.5；

wherein f is the total effective focal length of the optical system, and f12 is the combined focal length of the first lens and the second lens. When the relation is satisfied, the effective focal length of the optical system and the combined focal length of the first lens and the second lens can be reasonably configured, so that the total length of the optical system is effectively shortened, excessive increase of high-order spherical aberration of the optical system can be avoided, and the imaging quality of the optical system is improved.

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

TT/ImgH＜1.1；

and TT is the distance from the object side surface of the first lens to the image side surface of the sixth lens on the optical axis, and ImgH is half of the length of the diagonal line of the effective pixel area of the optical system on the imaging surface. When the above relational expression is satisfied, the imaging quality of the optical system on the imaging surface can be improved, the total length of the optical system can be effectively shortened, and the requirement of the miniaturization design of the lens can be further satisfied.

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

-1.5＜R9/R10＜0；

wherein R9 is a radius of curvature of an object-side surface of the fifth lens element at an optical axis, and R10 is a radius of curvature of an image-side surface of the fifth lens element at the optical axis. When the relation formula is satisfied, the relation between the object side surface and the image side surface of the fifth lens can be reasonably constrained, so that the deflection angle of the optical system can be reasonably distributed, the astigmatism of the off-axis field of view of the optical system can be improved, and the imaging quality of the optical system can be improved.

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

1＜|f6|/R12＜2；

wherein f6 is an effective focal length of the sixth lens, and R12 is a radius of curvature of an image-side surface of the sixth lens at an optical axis. When the relation is satisfied, the effective focal length and the image side surface of the sixth lens can be reasonably configured, so that the incident angle of light reaching the imaging surface of the optical system is reduced, and the optical system is easily matched with the photosensitive element.

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

1.0＜CT5/|SAG51|＜5.0；

wherein CT5 is the thickness of the fifth lens on the optical axis, SAG51 is the rise of the object side of the fifth lens. When the relation formula is satisfied, the fifth lens can be reasonably configured, so that the surface type of the fifth lens is more reasonable, the defect rate of processing and forming the fifth lens is reduced, meanwhile, the aberration generated by the optical system can be corrected, and the imaging quality of the optical system is further 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. The image capturing module adopts the optical system, so that the head of the camera lens is smaller, and the requirement of miniaturization design of electronic equipment can be met.

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, the head of the camera lens among the electronic equipment is less, can satisfy the demand of the miniaturized design of electronic equipment.

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 image capturing module according to an embodiment of the present application;

fig. 14 is a schematic diagram of an electronic device in an embodiment of the present application.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The 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. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

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 herein in the description of the invention 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.

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, and a sixth lens L6. Specifically, the first lens element L1 includes an object-side surface S1 and an image-side surface S2, the second lens element L2 includes an object-side surface S3 and an image-side surface S4, the third lens element L3 includes an object-side surface S5 and an image-side surface S6, the fourth lens element L4 includes an object-side surface S7 and an image-side surface S8, the fifth lens element L5 includes an object-side surface S9 and an image-side surface S10, and the sixth lens element L6 includes an object-side surface S11 and an image-side surface S12.

The first lens element L1 has positive refractive power, and the second lens element L2 has refractive power. The third lens element L3 has negative refractive power, and the object-side surface S5 and the image-side surface S6 of the third lens element L3 are both concave at their circumferences. The fourth lens element L4 has negative refractive power. The fifth lens element L5 has positive refractive power, and at least one of the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 has an inflection point for correcting the aberration of the off-axis field, thereby improving the imaging quality of the optical system 100. In the optical system 100, the lenses are coaxially arranged, and the central axes of the lenses are all in the same straight line, which is the optical axis of the optical system 100

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 L7 disposed on the image side of the sixth lens L6, and the infrared filter L7 includes an object-side surface S13 and an image-side surface S14. Furthermore, the optical system 100 further includes an image plane S15 located on the image side of the sixth lens L6, and incident light can be focused on the image plane S15 after being adjusted by 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. It should be noted that the infrared filter L7 may be an infrared cut filter, and is used for filtering the interference light and preventing the interference light from reaching the image plane S15 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 S9 and the image-side surface S10 of the fifth lens element L5 are aspheric, and the object-side surface and the image-side surface of the remaining lens elements of the optical system 100 can be spherical. It should be noted that the above embodiments are merely examples of some embodiments of the present application, and in some embodiments, the surfaces of the remaining lenses in the optical system 100 may be aspheric or any combination of spherical surfaces.

In some embodiments, each lens in the optical system 100 may be made of glass or plastic. The lens made of plastic material can reduce the weight of the optical system 100 and the production cost, and the small size of the optical system is matched to realize the light and small design 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, or the sixth lens L6 in some embodiments may also be greater than or equal to two, and a cemented lens may be formed between any two adjacent lenses, or may also be a non-cemented lens.

Further, in some embodiments, optical system 100 satisfies the relationship: CT1/SD11 is more than 0.60 and less than 1.01; CT1 is the thickness of the first lens L1 on the optical axis, i.e., the center thickness of the first lens L1, and SD11 is half of the maximum effective aperture of the object-side surface S1 of the first lens L1. Specifically, CT1/SD11 may be: 0.64, 0.69, 0.73, 0.75, 0.82, 0.86, 0.89, 0.91, 0.93 or 0.98. When the above relational expression is satisfied, the first lens L1 can be arranged reasonably, and the head of the imaging lens is made smaller, thereby satisfying the requirement of the miniaturization design of the electronic device.

In some embodiments, optical system 100 satisfies the relationship: TTL/CT1 is more than 5.5 and less than 9.0; the CT1 is the thickness of the first lens element L1 on the optical axis, and the TTL is the distance from the object-side surface S1 to the image S15 of the first lens element L1 on the optical axis. Specifically, TTL/CT1 may be: 5.81, 5.92, 6.31, 6.58, 6.85, 6.92, 7.12, 7.34, 7.58, or 7.69. When the above relational expression is satisfied, the system total length of the first lens L1 and the optical system 100 can be reasonably arranged, the head of the imaging lens can be ensured to be small, the system total length of the optical system 100 can be made small, and the demand for the miniaturization design of the electronic device can be further satisfied. Meanwhile, the thickness of the first lens L1 can be ensured to be sufficient, so that the yield of the first lens L1 is higher, and the assembly yield of the optical system 100 is further improved.

In some embodiments, optical system 100 satisfies the relationship: FNO is more than or equal to 2.2 and less than or equal to 2.6; wherein FNO is the f-number of the optical system 100. Specifically, the FNO may be 2.30, 2.32, 2.36, 2.39, 2.41, 2.47, 2.48, 2.51, 2.53, or 2.55. When the above relational expression is satisfied, it is advantageous to make the head of the imaging lens smaller while ensuring that the optical system 100 has a sufficient amount of light transmission.

In some embodiments, optical system 100 satisfies the relationship: 1 < f3/f4 < 10; where f3 is the effective focal length of the third lens L3, and f4 is the effective focal length of the fourth lens L4. Specifically, f3/f4 may be 1.336, 1.735, 2.208, 2.896, 3.528, 3.619, 4.626, 5.462, 7.264, or 9.218. When the above relational expression is satisfied, the third lens L3 and the fourth lens L4 can be arranged appropriately to effectively enlarge the angle of view of the optical system 100, thereby reducing the overall length of the optical system 100 and satisfying the demand for compact design.

In some embodiments, optical system 100 satisfies the relationship: 2.0 < f4/f1+ f5/f6 < 4.0; wherein f1 is the effective focal length of the first lens L1, and f4 is the effective focal length of the fourth lens L4; f5 is the effective focal length of the fifth lens L5, and f6 is the effective focal length of the sixth lens L6. Specifically, f4/f1+ f5/f6 may be 3.11, 3.16, 3.19, 3.22, 3.27, 3.41, 3.45, 3.49, 3.53, or 3.58. When the above-mentioned relational expression is satisfied, the refractive powers of the first lens element L1, the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 can be reasonably configured to ensure that the positive and negative spherical aberrations of the optical system 100 can be balanced with each other, thereby improving the imaging quality of the optical system 100.

In some embodiments, optical system 100 satisfies the relationship: f/f12 is more than 1.0 and less than 1.5; where f is the total effective focal length of the optical system 100, and f12 is the combined focal length of the first lens L1 and the second lens L2. Specifically, f/f12 may be 1.05, 1.06, 1.07, 1.09, 1.10, 1.12, 1.15, 1.16, 1.17, or 1.18. When the above relation is satisfied, the effective focal length of the optical system 100 and the combined focal length of the first lens L1 and the second lens L2 can be reasonably configured, so as to effectively shorten the total system length of the optical system 100, and simultaneously, avoid excessive increase of the high-order spherical aberration of the optical system 100, thereby improving the imaging quality of the optical system 100.

In some embodiments, optical system 100 satisfies the relationship: TT/ImgH is less than 1.1; TT 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 ImgH is half of a diagonal length of an effective pixel area of the optical system 100 on an image plane. Specifically, TT/ImgH may be 1.05, 1.06, 1.07, or 1.08. When the above relational expression is satisfied, the imaging quality of the optical system 100 on the image plane S15 can be improved, the total length of the optical system 100 can be effectively shortened, and the demand for the miniaturization design of the lens can be further satisfied.

In some embodiments, optical system 100 satisfies the relationship: -1.5 < R9/R10 < 0; wherein R9 is a radius of curvature of the object-side surface S9 of the fifth lens element L5 at the optical axis, and R10 is a radius of curvature of the image-side surface S10 of the fifth lens element L5 at the optical axis. Specifically, R9/R10 can be-1.19, -1.15, -1.11, -1.09, -0.98, -0.92, -0.88, -0.82, -0.75, or-0.72. When the above relational expression is satisfied, the relationship between the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 can be reasonably constrained, so that the deflection angle of the optical system 100 can be reasonably distributed, and the astigmatism of the off-axis field of the optical system 100 can be improved, thereby improving the imaging quality of the optical system 100.

In some embodiments, optical system 100 satisfies the relationship: 1 < | f6|/R12 < 2; where f6 is an effective focal length of the sixth lens L6, and R12 is a radius of curvature of the image-side surface S12 of the sixth lens L6 at the optical axis. Specifically, | f6|/R12 may be 1.82, 1.84, 1.85, 1.88, 1.89, 1.90, 1.92, 1.96, 1.97, or 1.98. When the above relation is satisfied, the effective focal length and the image-side surface S12 of the sixth lens element L6 can be appropriately configured to reduce the incident angle of the light reaching the image surface S15 of the optical system 100, so that the optical system 100 can be more easily matched with the photosensitive element.

In some embodiments, optical system 100 satisfies the relationship: 1.0 < CT5/| SAG51| < 5.0; here, CT5 is the thickness of the fifth lens L5 on the optical axis, and SAG51 is the rise of the object-side surface S9 of the fifth lens L5, that is, the distance from the intersection point of the object-side surface S9 of the fifth lens L5 on the optical axis to the maximum effective radius position of the object-side surface S9 of the fifth lens L5 in the direction parallel to the optical axis. Specifically, CT5/| SAG51| may be 1.91, 2.13, 2.52, 2.68, 3.22, 3.34, 3.87, 3.92, 4.13, or 4.26. When the above relational expression is satisfied, the fifth lens L5 can be arranged reasonably, the surface shape of the fifth lens L5 can be made more reasonable, the defect rate of the fifth lens L5 in the process molding can be reduced, the aberration generated by the optical system 100 can be corrected, and the imaging quality of the optical system 100 can be further improved.

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, and 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 negative 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 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the first embodiment, which is sequentially from left to right, wherein the astigmatism graph and the distortion graph are both graphs at 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 a plane at the paraxial region and a plane at the circumferential region;

the object-side surface S3 of the second lens L2 is a plane at the paraxial region and a plane at the circumferential region;

the image-side surface S4 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 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 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 concave 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 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 image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens L2 are planar, and the object-side surface S1 of the first lens L1, the image-side surface S4 of the second lens L2, the object-side surface and the image-side surface of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 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 and the sixth lens L6 are all made of plastic.

Further, the optical system 100 satisfies the relation: CT1/SD11 is 1.001; CT1 is the thickness of the first lens L1 on the optical axis, i.e., the center thickness of the first lens L1, and SD11 is half of the maximum effective aperture of the object-side surface S1 of the first lens L1. When the above relational expression is satisfied, the first lens L1 can be arranged reasonably, and the head of the imaging lens is made smaller, thereby satisfying the requirement of the miniaturization design of the electronic device.

The optical system 100 satisfies the relation: TTL/CT1 is 5.80; the CT1 is a thickness of the first lens element L1 on the optical axis, and the TTL is a distance from the object-side surface S1 to the image S15 of the first lens element L1. When the above relational expression is satisfied, the system total length of the first lens L1 and the optical system 100 can be reasonably arranged, the head of the imaging lens can be ensured to be small, the system total length of the optical system 100 can be made small, and the demand for the miniaturization design of the electronic device can be further satisfied. Meanwhile, the thickness of the first lens L1 can be ensured to be sufficient, so that the yield of the first lens L1 is higher, and the assembly yield of the optical system 100 is further improved.

The optical system 100 satisfies the relation: FNO 2.54; wherein FNO is the f-number of the optical system 100. When the above relational expression is satisfied, it is advantageous to make the head of the imaging lens smaller while ensuring that the optical system 100 has a sufficient amount of light transmission.

The optical system 100 satisfies the relation: f3/f4 ═ 9.218; where f3 is the effective focal length of the third lens L3, and f4 is the effective focal length of the fourth lens L4. When the above relational expression is satisfied, the third lens L3 and the fourth lens L4 can be arranged appropriately to effectively enlarge the angle of view of the optical system 100, thereby reducing the overall length of the optical system 100 and satisfying the demand for compact design.

The optical system 100 satisfies the relation: f4/f1+ f5/f6 is 3.58; wherein f1 is the effective focal length of the first lens L1, and f4 is the effective focal length of the fourth lens L4; f5 is the effective focal length of the fifth lens L5, and f6 is the effective focal length of the sixth lens L6. When the above-mentioned relational expression is satisfied, the refractive powers of the first lens element L1, the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 can be reasonably configured to ensure that the positive and negative spherical aberrations of the optical system 100 can be balanced with each other, thereby improving the imaging quality of the optical system 100.

The optical system 100 satisfies the relation: f/f12 is 1.05; where f is the total effective focal length of the optical system 100, and f12 is the combined focal length of the first lens L1 and the second lens L2. When the above relation is satisfied, the effective focal length of the optical system 100 and the combined focal length of the first lens L1 and the second lens L2 can be reasonably configured, so as to effectively shorten the total system length of the optical system 100, and simultaneously, avoid excessive increase of the high-order spherical aberration of the optical system 100, thereby improving the imaging quality of the optical system 100.

The optical system 100 satisfies the relation: TT/ImgH is 1.05; TT 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 ImgH is half of a diagonal length of an effective pixel area of the optical system 100 on an image plane. When the above relational expression is satisfied, the imaging quality of the optical system 100 on the image plane S15 can be improved, the total length of the optical system 100 can be effectively shortened, and the demand for the miniaturization design of the lens can be further satisfied.

The optical system 100 satisfies the relation: R9/R10 ═ -1.19; wherein R9 is a radius of curvature of the object-side surface S9 of the fifth lens element L5 at the optical axis, and R10 is a radius of curvature of the image-side surface S10 of the fifth lens element L5 at the optical axis. When the above relational expression is satisfied, the relationship between the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 can be reasonably constrained, so that the deflection angle of the optical system 100 can be reasonably distributed, and the astigmatism of the off-axis field of the optical system 100 can be improved, thereby improving the imaging quality of the optical system 100.

The optical system 100 satisfies the relation: 1.83, | f6|/R12 ═ 1.83; where f6 is an effective focal length of the sixth lens L6, and R12 is a radius of curvature of the image-side surface S12 of the sixth lens L6 at the optical axis. When the above relation is satisfied, the effective focal length and the image-side surface S12 of the sixth lens element L6 can be appropriately configured to reduce the incident angle of the light reaching the image surface S15 of the optical system 100, so that the optical system 100 can be more easily matched with the photosensitive element.

The optical system 100 satisfies the relation: CT5/| SAG51| ═ 3.70; wherein, CT5 is the thickness of the fifth lens L5 on the optical axis, and SAG51 is the rise of the object side surface S9 of the fifth lens L5. When the above relational expression is satisfied, the fifth lens L5 can be arranged reasonably, the surface shape of the fifth lens L5 can be made more reasonable, the defect rate of the fifth lens L5 in the process molding can be reduced, the aberration generated by the optical system 100 can be corrected, and the imaging quality of the optical system 100 can be further improved.

In addition, the parameters of the optical system 100 are given in table 1. Among them, the image plane S15 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 S15 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 L7, but the distance from the image-side surface S11 of the sixth lens L6 to the image surface S15 is kept constant at this time.

In the first embodiment, the total effective focal length f of the optical system 100 is 3.68mm, the f-number FNO is 2.54, half of the maximum field angle HFOV is 41.06 °, and the distance TTL on the optical axis from the object-side surface S1 to the image surface S15 of the first lens L1 is 4.4 mm.

The focal length, refractive index, and abbe number of each lens are values at a wavelength of 555nm, 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. Wherein, the surface numbers represent the image side or the object side S1-S10 from 1-10, 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 is an eighth 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 negative refractive power, a third lens element L3 with negative 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. 4 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the second embodiment, from left to right.

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:

CT1/SD11＝0.967；TTL/CT1＝6.03；FNO＝2.55；f3/f4＝6.534；

f4/f1+f5/f6＝3.57；f/f12＝1.06；TT/ImgH＝1.05；R9/R10＝-1.15；

|f6|/R12＝1.82；CT5/|SAG51|＝3.78。

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 negative refractive power, a third lens element L3 with negative 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. 6 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the third embodiment, from left to right.

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

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

CT1/SD11＝0.85；TTL/CT1＝6.60；FNO＝2.41；f3/f4＝3.689；

f4/f1+f5/f6＝3.25；f/f12＝1.08；TT/ImgH＝1.07；R9/R10＝-1.00；

|f6|/R12＝1.86；CT5/|SAG51|＝4.3。

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 negative refractive power, a fifth lens element L5 with positive refractive power, and a sixth lens element L6 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.

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

CT1/SD11＝0.82；TTL/CT1＝6.84；FNO＝2.41；f3/f4＝3.148；

f4/f1+f5/f6＝3.21；f/f12＝1.10；TT/ImgH＝1.07；R9/R10＝-1.00；

|f6|/R12＝1.87；CT5/|SAG51|＝4.26。

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 negative refractive power, a fifth lens element L5 with positive refractive power, and a sixth lens element L6 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 image-side surface S6 of the third lens element L3 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

CT1/SD11＝0.712；TTL/CT1＝7.69；FNO＝2.35；f3/f4＝1.707；

f4/f1+f5/f6＝3.10；f/f12＝1.16；TT/ImgH＝1.08；R9/R10＝-0.86；

|f6|/R12＝1.89；CT5/|SAG51|＝2.61。

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 negative refractive power, a fifth lens element L5 with positive refractive power, and a sixth lens element L6 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.

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

CT1/SD11＝0.636；TTL/CT1＝8.4；FNO＝2.30；f3/f4＝1.336；

f4/f1+f5/f6＝3.17；f/f12＝1.18；TT/ImgH＝1.08；R9/R10＝-0.72；

|f6|/R12＝1.98；CT5/|SAG51|＝1.91。

referring to fig. 13, 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 can be regarded as the image surface S15 of the optical system 100. The image capturing module 200 may further include an infrared filter L7, and the infrared filter L7 is disposed between the image side surface S12 and the image surface S15 of the sixth lens element L6. Specifically, the photosensitive element 210 may be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) Device. The optical system 100 is adopted in the image capturing module 200, so that the head of the camera lens is smaller, and the requirement of miniaturization design of the electronic equipment can be met.

Referring to fig. 14, in some embodiments, the image capturing module 200 may be used in an electronic device 300, the electronic device includes a housing 310, and the image capturing module 200 is mounted on 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. The image capturing module 200 is adopted in the electronic device 300, and the head of the lens in the electronic device 300 is small, so that the requirement of miniaturization design of the electronic device 300 can be met. Further, it is understood that, in some embodiments, when the electronic device 300 is a smart phone, the lens in the electronic device 300 may be mounted in the housing 310 in an under-screen packaging manner, and at this time, an opening needs to be formed in the screen of the electronic device 300 to expose the lens, so that light outside the electronic device 300 can enter the electronic device 300 through the optical system 100 and be imaged on the photosensitive surface of the photosensitive element 210. The image capturing module 200 is adopted in the electronic device 300, and the lens can be exposed when the head of the lens is smaller, so that the screen opening of the electronic device 300 is smaller, the screen occupation ratio of the electronic device 300 is improved, and the requirement of the miniaturization design of the electronic device 300 is further met.

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 first lens element with positive refractive power;

a second lens element with refractive power;

a fourth lens element with negative refractive power;

a sixth lens element with negative refractive power;

and the optical system satisfies the following relation:

0.60＜CT1/SD11＜1.01；

5.5＜TTL/CT1＜9.0；

2. The optical system of claim 1, wherein the following relationship is satisfied:

2.2≤FNO≤2.6；

wherein FNO is an f-number of the optical system.

3. The optical system of claim 1, wherein the following relationship is satisfied:

1＜f3/f4＜10；

wherein f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

4. The optical system of claim 1, wherein the following relationship is satisfied:

2.0＜f4/f1+f5/f6＜4.0；

wherein f1 is the effective focal length of the first lens, and f4 is the effective focal length of the fourth lens; f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

5. The optical system of claim 1, wherein the following relationship is satisfied:

1.0＜f/f12＜1.5；

wherein f is the total effective focal length of the optical system, and f12 is the combined focal length of the first lens and the second lens.

6. The optical system of claim 1, wherein the following relationship is satisfied:

TT/ImgH＜1.1；

and TT is the distance from the object side surface of the first lens to the image side surface of the sixth lens on the optical axis, and ImgH is half of the length of the diagonal line of the effective pixel area of the optical system on the imaging surface.

7. The optical system of claim 1, wherein the following relationship is satisfied:

-1.5＜R9/R10＜0；

wherein R9 is a radius of curvature of an object-side surface of the fifth lens element at an optical axis, and R10 is a radius of curvature of an image-side surface of the fifth lens element at the optical axis.

8. The optical system of claim 1, wherein the following relationship is satisfied:

1＜|f6|/R12＜2；

wherein f6 is an effective focal length of the sixth lens, and R12 is a radius of curvature of an image-side surface of the sixth lens at an optical axis.

9. The optical system of claim 1, wherein the following relationship is satisfied:

1.0＜CT5/|SAG51|＜5.0；

wherein CT5 is the thickness of the fifth lens on the optical axis, SAG51 is the rise of the object side of the fifth lens.

10. An image capturing module, comprising a photosensitive element and the optical system of 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 image capturing module of claim 10, wherein the image capturing module is mounted on the housing.