CN211786314U

CN211786314U - Optical system, camera module and electronic device

Info

Publication number: CN211786314U
Application number: CN202020295421.2U
Authority: CN
Inventors: 刘彬彬; 张文燕; 李明; 邹海荣
Original assignee: OFilm Tech Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2020-03-11
Filing date: 2020-03-11
Publication date: 2020-10-27
Anticipated expiration: 2030-03-11

Abstract

The utility model relates to an optical system, module and electron device make a video recording. The optical system includes in order from an object side to an image side: the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a third lens element with refractive power; a fourth lens element, a fifth lens element, and a sixth lens element with refractive power; a seventh lens element with positive refractive power having a convex object-side surface and a concave image-side surface; an eighth lens element with negative refractive power having a concave image-side surface at an optical axis; the optical system satisfies the relationship: DL/Imgh is more than 0.2 and less than 0.5; wherein DL is the aperture size of the diaphragm, and Imgh is the diagonal length of the effective imaging area of the optical system on the imaging surface. The optical system can effectively improve the shooting quality of the system in a dark light environment.

Description

Optical system, camera module and electronic device

Technical Field

The utility model relates to a field of making a video recording especially relates to an optical system, module and electron device make a video recording.

Background

With the wide application of electronic products such as smart phones, tablet computers, unmanned planes, computers, and the like in life, the camera shooting performance of the electronic products also becomes one of the important points concerned by users when selecting products. In addition, the photosensitive element is improved in performance along with technological progress, and the possibility of further improving the shooting quality is provided. Particularly, as the demand for taking dark scenes such as night scenes and starry sky is gradually increased, whether the optical system can be matched with the photosensitive element to take a picture with clear image quality in a dark environment becomes one of the key factors for improving the shooting quality of the current camera.

SUMMERY OF THE UTILITY MODEL

Accordingly, it is desirable to provide an optical system, an image pickup module and an electronic device for improving the quality of image pickup in a dark environment.

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

the optical lens comprises a first lens element with positive refractive power, a second lens element with positive refractive power, and a third lens element with positive refractive power, wherein the object-side surface of the first lens element is convex at the optical axis, and the image-side surface of the first lens element is concave at the optical axis;

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

a third lens element with refractive power;

a fourth lens element with refractive power;

a fifth lens element with refractive power;

a sixth lens element with negative refractive power;

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

an eighth lens element with negative refractive power having a concave image-side surface at an optical axis;

the optical system satisfies the following relationship:

0.2＜DL/Imgh＜0.5；

and DL is the size of the diaphragm aperture of the optical system, and Imgh is the diagonal length of an effective imaging area of the optical system on an imaging surface.

The aperture size of the diaphragm of the system determines the light transmission amount of the whole system, the size of the image plane determines the pixel size and the image definition of the whole system, and the aperture size and the image plane are reasonably matched to ensure that the system has reasonable light transmission amount so as to ensure the shooting definition. When the optical system meets the relationship among the refractive power, the surface type and the conditional expression of the lens, the light transmission quantity and the size of an imaging surface of the optical system can be reasonably configured, so that the shooting quality of the system in a dark light environment can be effectively improved. When DL/Imgh is more than 0.5, the system exposure is too large, the brightness is too high, and the picture quality is finally influenced; if DL/Imgh is less than 0.2, the amount of light passing through the system is insufficient, and the relative brightness of light is insufficient, thereby reducing the image sharpness.

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

0＜sin(FOV)/TTL＜0.2；

the FOV is the maximum field angle of the optical system, the TTL is the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis, and the unit of the TTL is mm. When the relation is satisfied, the optical system can simultaneously satisfy the effects of miniaturization and large-range scene shooting, and can also satisfy the requirement of high-definition shooting. When sin (FOV)/TTL is more than 0.2, the structure of the system is too compact, aberration correction is difficult, and imaging performance is reduced; when SIN (FOV)/TTL is less than 0, the system structure becomes too long and it is difficult to satisfy the design requirement of miniaturization.

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

Fno/TTL＜0.5；

wherein, Fno is the f-number of the optical system, TTL is the distance from the object-side surface of the first lens element to the imaging surface of the optical system on the optical axis, and the unit of TTL is mm. When the relation is satisfied, the optical system can simultaneously meet the design requirements of large aperture and miniaturization, provides enough light transmission amount for shooting, and satisfies the requirement of high-image-quality and high-definition shooting. When Fno/TTL is greater than 0.5, the system is miniaturized and the amount of light transmitted is insufficient, resulting in a reduction in the resolution of the captured image.

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

0.1≤BFL/TTL＜0.4；

the BFL is a shortest distance from an image side surface of the eighth lens element to an imaging surface of the optical system in a direction parallel to the optical axis, and the TTL is a distance from an object side surface of the first lens element to the imaging surface of the optical system in the optical axis. When satisfying above-mentioned relation, can guarantee that the system has sufficient focusing range in order to promote the equipment yield of module, guarantee simultaneously that the system has great depth of focus in order to obtain more degree of depth information of object space.

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

-4＜f6/f7＜0；

wherein f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. The sixth lens element provides negative refractive power to diverge light rays and meet the requirement of image height, and the seventh lens element provides positive refractive power to converge light rays. When the relation is satisfied, the refractive power of the two optical systems is reasonably distributed, so that the system volume can be effectively compressed, the miniaturization design requirement is realized, and meanwhile, the aberration and the curvature of field of the whole optical system can be well corrected.

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

0.2＜DL/TTL＜1；

wherein DL is a diaphragm aperture size of the optical system, and 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. When the above relation is satisfied, the miniaturization design of the system can be ensured, and the light flux required by the system shooting can be provided, so that the high-image-quality and high-definition shooting effect can be realized. When DL/TTL is more than 1, the system can cause the light-passing aperture of the diaphragm to be overlarge when the system meets the miniaturization design, so that marginal rays enter the system, and further the imaging quality is reduced; when DL/TTL is less than 0.2, the system can cause the light-passing aperture of the diaphragm to be too small while meeting the miniaturization design, thereby the light-passing quantity requirement of the system can not be met, and the high-definition shooting requirement under the dark light environment can not be realized.

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

TTL/Imgh＜1；

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 diagonal length of an effective imaging area of the optical system on the imaging surface. When the above relationship is satisfied, the optical system can simultaneously achieve both a compact design and high-definition shooting. And when TTL/Imgh is more than 1, the system can not ensure the high-definition imaging effect while realizing miniaturization.

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

1.0＜TTL/f＜2.0；

wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical system, and f is an effective focal length of the optical system. When satisfying above-mentioned relation, optical system's effective focal length and optics overall length will obtain rational configuration, can not only realize miniaturized design, can also guarantee simultaneously that light assembles better on the imaging surface of system to be favorable to improving imaging quality, guarantee the authenticity of image. When TTL/f is less than or equal to 1.0, the optical length of the system is too short, so that the sensitivity of the system is increased, and meanwhile, the convergence of light rays on an imaging surface is not facilitated; when TTL/f is greater than or equal to 2, the optical length of the system is too long, which may cause the main ray angle to be too large when the light enters the imaging plane, so that the marginal light cannot be imaged on the imaging plane, and further cause imaging information to be incomplete.

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

0＜R11/R12＜3.5；

wherein R11 is a radius of curvature of an object-side surface of the sixth lens element at an optical axis, and R12 is a radius of curvature of an image-side surface of the sixth lens element at the optical axis. When the relationship is satisfied, the curvature radii of the object side surface and the image side surface of the sixth lens element can be configured properly, which is beneficial to reducing the sensitivity of the system and improving the forming yield.

An image capturing module includes a photosensitive element and the optical system of any of the above embodiments, wherein the photosensitive element is disposed on an image side of the optical system. By adopting the optical system, the camera module can have excellent camera quality. Through adopting above-mentioned optical system, the light flux of system with the sensitization face size of sensitization component can obtain rational configuration to can effectively promote the module and shoot the quality under the dim light environment.

An electronic device comprises a fixing piece and the camera module, wherein the camera module is arranged on the fixing piece. Through adopting above-mentioned module of making a video recording, electron device can possess good shooting function. Through adopting above-mentioned module of making a video recording, electron device also can possess good shooting quality when shooing dim light scenes such as night scene, starry sky.

Drawings

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. 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. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

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

Referring to fig. 1, in some embodiments of the present application, the optical system 10 includes, in order from an object side to an image side, a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8, where each of the first lens L1 to the eighth lens L8 includes only one lens. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power or negative refractive power, the fourth lens element L4 with positive refractive power or negative refractive power, the fifth lens element L5 with positive refractive power or negative refractive power, the sixth lens element L6 with negative refractive power, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power. Each lens of the optical system 10 is disposed coaxially with the stop STO, that is, the optical axis of each lens and the center of the stop STO are located on the same straight line, which may be referred to as the optical axis of the optical system 10.

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 includes an object side surface S11 and an image side surface S12, the seventh lens includes an object side surface S13 and an image side surface S14, and the eighth lens includes an object side surface S15 and an image side surface S16. In addition, the optical system 10 further has a virtual image plane S19, and the image plane S19 is located on the image side of the eighth lens element. Generally, the image forming surface S19 of the optical system 10 coincides with the photosensitive surface of the photosensitive element, and for the sake of understanding, the image forming surface S19 may be regarded as the photosensitive surface of the photosensitive element.

In the above embodiment, the object-side surface S1 of the first lens element L1 is convex and the image-side surface S2 is concave; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S13 of the seventh lens element is convex and the image-side surface S14 is concave; the image-side surface S16 of the eighth lens element is concave at the optical axis.

In the above embodiments, the object-side surface and the image-side surface of the first lens element L1 through the eighth lens element L8 are aspheric, and the object-side surface S15 and the image-side surface S16 of the eighth lens element L8 both have an inflection point. The aspheric surface can further help the optical system 10 to eliminate aberration, solve the problem of distortion of the field of view, and meanwhile, is beneficial to the miniaturization design of the optical system 10, so that the optical system 10 can have excellent optical effect on the premise of keeping the miniaturization design. Of course, in other embodiments, the object-side surface of any one of the first lens element L1 through the eighth lens element L8 may be a spherical surface or an aspherical surface; the image-side surface of any one of the first lens element L1 to the eighth lens element L8 may be a spherical surface or an aspherical surface, and the problem of aberration can be effectively solved by the cooperation between the spherical surface and the aspherical surface, so that the optical system 10 has an excellent imaging effect, and the flexibility of lens design and assembly is improved. In particular, when the eighth lens L8 is an aspheric lens, it is advantageous to perform final correction on the aberration generated by the front lenses, thereby improving the imaging quality. It is to be noted that the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are referenced by way of example only and are not drawn to scale.

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

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

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

In the above embodiment, the material of each lens in the optical system 10 is plastic. Of course, in some embodiments, the material of each lens in the optical system 10 is glass. The plastic lens can reduce the weight of the optical system 10 and the production cost, while the glass lens can withstand higher temperatures and has excellent optical effects. In other embodiments, the first lens L1 is made of glass, and the second lens L2 to the eighth lens L8 are made of plastic, and at this time, since the lens located at the object side in the optical system 10 is made of glass, the glass lenses located at the object side have a good tolerance effect on extreme environments, and are not susceptible to aging and the like caused by the influence of the object side environment, so that when the optical system 10 is in extreme environments such as exposure to high temperature, the optical performance and cost of the system can be well balanced by the structure. Of course, the arrangement relationship of the lens materials in the optical system 10 is not limited to the above embodiment, and the material of any lens may be plastic or glass.

In some embodiments, the optical system 10 includes an ir-cut filter L9, and the ir-cut filter L9 is disposed on the image side of the eighth lens L8 and is fixed relative to each lens in the optical system 10. The infrared cut filter L9 includes an object side S17 and an image side S18. The infrared cut-off filter L9 is used for filtering infrared light and preventing the infrared light from reaching the imaging surface S19 of the system, thereby preventing the infrared light from interfering with normal imaging. An infrared cut filter L9 may be assembled with each lens as part of the optical system 10. In other embodiments, the ir-cut filter L9 is not part of the optical system 10, and the ir-cut filter L9 may be installed between the optical system 10 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into a camera module. In some embodiments, an infrared cut filter L9 may also be disposed on the object side of the first lens L1. In addition, in some embodiments, the infrared cut filter L9 may not be provided, and a filter plating layer may be provided on any one of the first lens L1 to the eighth lens L8 to filter infrared light.

In other embodiments, the first lens element L1 may also include two or more lens elements, wherein the object-side surface of the lens element closest to the object side is the object-side surface S1 of the first lens element L1, and the image-side surface of the lens element closest to the image side is the image-side surface S2 of the first lens element L1. Accordingly, any one of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in some embodiments is not limited to the case where only one lens is included.

In some embodiments, the optical system 10 also satisfies the following relationships:

DL/Imgh is more than 0.2 and less than 0.5; where DL is the stop aperture size of the optical system 10, and Imgh is the diagonal length of the effective imaging area of the optical system 10 on the imaging plane S19. DL/Imgh in some embodiments is 0.30, 0.31, 0.33, 0.35, 0.36, or 0.37. The aperture size of the diaphragm STO of the system determines the light flux of the whole system, the size of the image plane S19 determines the pixel size and the image definition of the whole system, and the reasonable light flux of the system can be ensured only by reasonable matching of the two, so that the shooting definition is ensured. When the optical system 10 satisfies the relationship among the refractive power, the surface shape and the conditional expression of the lens elements, the light flux of the optical system 10 and the size of the image plane S19 can be configured reasonably, so as to effectively improve the shooting quality of the system in a dark environment. When DL/Imgh is more than 0.5, the system exposure is too large, the brightness is too high, and the picture quality is finally influenced; if DL/Imgh is less than 0.2, the amount of light passing through the system is insufficient, and the relative brightness of light is insufficient, thereby reducing the image sharpness.

0 < sin (FOV)/TTL < 0.2; wherein, the FOV is the maximum field angle of the optical system 10, and the TTL is the distance from the object-side surface S1 of the first lens element L1 to the image plane S19 of the optical system 10 on the optical axis, and the unit of the TTL is mm. Sin (FOV)/TTL in some embodiments is 0.145, 0.15, 0.155, or 0.16, in units of (1/mm). When the above relationship is satisfied, the optical system 10 can satisfy both the miniaturization and the effect of shooting a large-scale scene, and also can satisfy the requirement of high-definition shooting. When sin (FOV)/TTL is more than 0.2, the structure of the system is too compact, aberration correction is difficult, and imaging performance is reduced; when SIN (FOV)/TTL is less than 0, the system structure becomes too long and it is difficult to satisfy the design requirement of miniaturization.

Fno/TTL is less than 0.5; where Fno is an f-number of the optical system 10, TTL is a distance on an optical axis from the object-side surface S1 of the first lens element L1 to the image plane S19 of the optical system 10, and the unit of TTL is mm. In some embodiments the Fno/TTL is 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, or 0.29, and the numerical units are (1/mm). When the above relationship is satisfied, the optical system 10 can satisfy both the design requirements of a large aperture and miniaturization, provide a sufficient amount of light transmission for image capturing, and satisfy the high-quality and high-definition image capturing requirements. When Fno/TTL is greater than 0.5, the system is miniaturized and the amount of light transmitted is insufficient, resulting in a reduction in the resolution of the captured image.

BFL/TTL is more than or equal to 0.1 and less than 0.4; BFL is the shortest distance from the image-side surface S16 of the eighth lens element L8 to the image plane S19 of the optical system 10 in the direction parallel to the optical axis, and TTL is the distance from the object-side surface S1 of the first lens element L1 to the image plane S19 of the optical system 10 in the optical axis. The BFL/TTL in some embodiments is 0.10, 0.11, 0.12, 0.13, or 0.14. When satisfying above-mentioned relation, can guarantee that the system has sufficient focusing range in order to promote the equipment yield of module, guarantee simultaneously that the system has great depth of focus in order to obtain more degree of depth information of object space.

-4 < f6/f7 < 0; where f6 is an effective focal length of the sixth lens L6, and f7 is an effective focal length of the seventh lens L7. Some embodiments of f6/f7 is-3.25, -3.20, -3.10, -3.00, -2.80, -2.60, -2.50, -2.40, or-2.30. The sixth lens element L6 with negative refractive power can diverge light beams to meet the requirement of image height, and the seventh lens element L7 with positive refractive power can converge light beams. When the above relationship is satisfied, the refractive powers of the two are reasonably distributed, so that the system volume can be effectively compressed, the miniaturization design requirement is realized, and meanwhile, the aberration and the curvature of field of the whole optical system 10 can be well corrected.

DL/TTL is more than 0.2 and less than 1; where DL is the stop aperture size of the optical system 10, and TTL is the distance from the object-side surface S1 of the first lens element L1 to the image plane S19 of the optical system 10 on the optical axis. The DL/TTL in some embodiments is 0.42, 0.43, 0.44, 0.45, 0.46, 0.48, or 0.50. When the above relation is satisfied, the miniaturization design of the system can be ensured, and the light flux required by the system shooting can be provided, so that the high-image-quality and high-definition shooting effect can be realized. When DL/TTL is more than 1, the light-passing aperture of the diaphragm STO is overlarge when the system meets the requirement of miniaturization design, so that marginal rays enter the system, and the imaging quality is further reduced; when DL/TTL is less than 0.2, the system can cause the light passing aperture of the diaphragm STO to be too small while meeting the miniaturization design, thereby the light passing amount requirement of the system can not be met, and the high-definition shooting requirement under the dim light environment can not be realized.

TTL/Imgh is less than 1; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane S19 of the optical system 10, and Imgh is a diagonal length of an effective image area of the optical system 10 on the image plane S19. TTL/Imgh in some embodiments is 0.70, 0.71, 0.72, 0.73, or 0.74. When the above relationship is satisfied, the optical system 10 can achieve both the compact design and the high-definition imaging. And when TTL/Imgh is more than 1, the system can not ensure the high-definition imaging effect while realizing miniaturization.

TTL/f is more than 1.0 and less than 2.0; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane S19 of the optical system 10, and f is an effective focal length of the optical system 10. TTL/f in some embodiments is 1.21, 1.22, 1.24, 1.25, 1.27, 1.29, or 1.30. When the above relation is satisfied, the effective focal length and the total optical length of the optical system 10 are reasonably configured, so that not only can the miniaturization design be realized, but also the light can be guaranteed to better converge on the imaging surface S19 of the system, thereby being beneficial to improving the imaging quality and guaranteeing the authenticity of the image. When TTL/f is less than or equal to 1.0, the optical length of the system is too short, which can cause the sensitivity of the system to be increased and is also beneficial to the convergence of light rays on the imaging surface S19; when TTL/f is greater than or equal to 2, the optical length of the system is too long, which may cause the chief ray angle when the light enters the imaging plane S19 to be too large, so that the marginal light cannot be imaged on the imaging plane S19, and further cause imaging information insufficiency.

R11/R12 is more than 0 and less than 3.5; wherein R11 is a radius of curvature of the object-side surface S11 of the sixth lens element L6 at the optical axis, and R12 is a radius of curvature of the image-side surface S12 of the sixth lens element L6 at the optical axis. Some embodiments R11/R12 is 0.60, 0.70, 0.80, 1.00, 1.20, 1.50, 1.80, 2.00, 2.10, 2.30, 2.50, 2.60, or 2.70. When the above relationship is satisfied, the curvature radii of the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 can be configured appropriately, which is beneficial to reducing the sensitivity of the system and increasing the molding yield.

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

first embodiment

Referring to fig. 1 and 2, in the first embodiment, the optical system 10 includes, in order from 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 positive refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with negative refractive power, a seventh lens element L7 with positive refractive power, and an eighth lens element L8 with negative refractive power. Fig. 2 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the first embodiment. Wherein the ordinate of the astigmatism diagram and the distortion diagram can be understood as a half of the diagonal length of the effective imaging area on the imaging plane S19 in mm. The astigmatism and distortion maps are graphs at a wavelength of 555 nm.

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

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

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

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

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

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

The object-side surface S13 of the seventh lens element L7 is convex along the optical axis, and the image-side surface S14 is concave along the optical axis; object side S13 is concave at the circumference, and image side S14 is convex at the circumference.

The object-side surface S15 of the eighth lens element L8 is concave along the optical axis, and the image-side surface S16 is concave along the optical axis; object side S15 is concave at the circumference, like side S16.

The object-side surface and the image-side surface of each of the first lens L1 through the eighth lens L8 are aspheric, and the object-side surface S15 and the image-side surface S16 of the eighth lens L8 both have an inflection point. By matching the aspheric surface type of each lens in the optical system 10, the problem of distortion of the field of view of the optical system 10 can be effectively solved, and the lens can achieve excellent optical effect under the condition of small and thin lens, so that the optical system 10 has smaller volume, and the optical system 10 is beneficial to realizing miniaturization design. And the material of each lens in the optical system 10 is plastic. The use of the plastic lens can reduce the manufacturing cost of the optical system 10.

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

DL/Imgh is 0.37; where DL is the stop aperture size of the optical system 10, and Imgh is the diagonal length of the effective imaging area of the optical system 10 on the imaging plane S19. The aperture size of the system determines the light transmission amount of the whole system, the size of the image plane S19 determines the pixel size and the image definition of the whole system, and the reasonable light transmission amount of the system can be ensured only by reasonable matching of the aperture size and the image plane S19, so that the shooting definition is ensured. When the optical system 10 satisfies the relationship among the refractive power, the surface shape and the conditional expression of the lens elements, the light flux of the optical system 10 and the size of the image plane S19 can be configured reasonably, so as to effectively improve the shooting quality of the system in a dark environment.

sin (fov)/TTL ═ 0.14 (1/mm); wherein, the FOV is the maximum field angle of the optical system 10, and the TTL is the distance from the object-side surface S1 of the first lens element L1 to the image plane S19 of the optical system 10 on the optical axis, and the unit of the TTL is mm. When the above relationship is satisfied, the optical system 10 can satisfy both the miniaturization and the effect of shooting a large-scale scene, and also can satisfy the requirement of high-definition shooting.

Fno/TTL ═ 0.24 (1/mm); where Fno is an f-number of the optical system 10, TTL is a distance on an optical axis from the object-side surface S1 of the first lens element L1 to the image plane S19 of the optical system 10, and the unit of TTL is mm. When the above relationship is satisfied, the optical system 10 can satisfy both the design requirements of a large aperture and miniaturization, provide a sufficient amount of light transmission for image capturing, and satisfy the high-quality and high-definition image capturing requirements.

BFL/TTL is 0.14; BFL is the shortest distance from the image-side surface S16 of the eighth lens element L8 to the image plane S19 of the optical system 10 in the direction parallel to the optical axis, and TTL is the distance from the object-side surface S1 of the first lens element L1 to the image plane S19 of the optical system 10 in the optical axis. When satisfying above-mentioned relation, can guarantee that the system has sufficient focusing range in order to promote the equipment yield of module, guarantee simultaneously that the system has great depth of focus in order to obtain more degree of depth information of object space.

f6/f7 is-3.08; where f6 is an effective focal length of the sixth lens L6, and f7 is an effective focal length of the seventh lens L7. The sixth lens element L6 with negative refractive power can diverge light beams to meet the requirement of image height, and the seventh lens element L7 with positive refractive power can converge light beams. When the above relationship is satisfied, the refractive powers of the two are reasonably distributed, so that the system volume can be effectively compressed, the miniaturization design requirement is realized, and meanwhile, the aberration and the curvature of field of the whole optical system 10 can be well corrected.

DL/TTL is 0.51; where DL is the stop aperture size of the optical system 10, and TTL is the distance from the object-side surface S1 of the first lens element L1 to the image plane S19 of the optical system 10 on the optical axis. When the above relation is satisfied, the miniaturization design of the system can be ensured, and the light flux required by the system shooting can be provided, so that the high-image-quality and high-definition shooting effect can be realized.

TTL/Imgh is 0.73; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane S19 of the optical system 10, and Imgh is a diagonal length of an effective image area of the optical system 10 on the image plane S19. When the above relationship is satisfied, the optical system 10 can achieve both the compact design and the high-definition imaging.

TTL/f is 1.21; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane S19 of the optical system 10, and f is an effective focal length of the optical system 10. When the above relation is satisfied, the effective focal length and the total optical length of the optical system 10 are reasonably configured, so that not only can the miniaturization design be realized, but also the light can be guaranteed to better converge on the imaging surface S19 of the system, thereby being beneficial to improving the imaging quality and guaranteeing the authenticity of the image.

R11/R12 ═ 2.03; wherein R11 is a radius of curvature of the object-side surface S11 of the sixth lens element L6 at the optical axis, and R12 is a radius of curvature of the image-side surface S12 of the sixth lens element L6 at the optical axis. When the above relationship is satisfied, the curvature radii of the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 can be configured appropriately, which is beneficial to reducing the sensitivity of the system and increasing the molding yield.

In addition, each lens parameter of the optical system 10 is given by table 1 and table 2. Table 2 shows the aspherical surface coefficients of the lenses in table 1, where K is a conic coefficient and Ai is a coefficient corresponding to the i-th higher-order term in the aspherical surface formula. The elements from the object plane to the image plane (the image plane S19, which is also understood to be the photosensitive surface of the photosensitive element during post-assembly) are sequentially arranged in the order of the elements from top to bottom in table 1, wherein the object on the object plane can be clearly imaged on the image plane S19 of the optical system 10. Surface numbers 1 and 2 respectively indicate an object-side surface S1 and an image-side surface S2 of the first lens L1, that is, a surface having a smaller surface number is an object-side surface and a surface having a larger surface number is an image-side surface in the same lens. The Y radius in table 1 is a curvature radius of the object-side surface or the image-side surface of the corresponding surface number on the optical axis. The first value of the lens in the "thickness" parameter set is the thickness of the lens on the optical axis, and the second value is the distance from the image-side surface of the lens to the object-side surface of the next optical element on the optical axis. The numerical value of the stop ST0 in the "thickness" parameter column is the distance on the optical axis from the stop ST0 to the vertex of the object-side surface of the subsequent lens (the vertex refers to the intersection point of the lens and the optical axis), and we default that the direction from the object-side surface of the first lens L1 to the image-side surface of the last lens is the positive direction of the optical axis, when the value is negative, it indicates that the stop ST0 is disposed on the right side of the vertex of the object-side surface of the lens, and when the "thickness" parameter of the stop STO is positive, the stop ST0 is on the left side of the vertex of the object-. The optical axes of the lenses in the embodiment of the present application are on the same straight line as the optical axis of the optical system 10. Note that, in the following embodiments, the infrared cut filter L9 may be an element in the optical system 10, or may not be an element in the optical system 10.

In the first embodiment, the effective focal length f of the optical system 10 is 5.55mm, the f-number FNO is 1.63, the maximum field angle (i.e., the diagonal viewing angle) FOV is 77.61 °, and the total optical length TTL is 6.74 mm.

In addition, in each of the following examples (first to seventh examples), the refractive index, abbe number, and focal length of each lens are numerical values at a wavelength of 555 nm. In addition, the relational expression calculation and the lens structure of each example are based on lens parameters (e.g., table 1, table 2, table 3, table 4, etc.).

TABLE 1

TABLE 2

Second embodiment

Referring to fig. 3 and 4, in the second embodiment, the optical system 10 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 positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, a seventh lens element L7 with positive refractive power, and an eighth lens element L8 with negative refractive power. Fig. 4 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the second embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.

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

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

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

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

The object-side surface S15 of the eighth lens element L8 is convex along the optical axis, and the image-side surface S16 is concave along the optical axis; object side S15 is concave at the circumference, like side S16.

In addition, the lens parameters of the optical system 10 in the second embodiment are shown in tables 3 and 4, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 3

TABLE 4

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

third embodiment

Referring to fig. 5 and 6, in the third embodiment, the optical system 10 includes, in order from the object side to the image side, 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 positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, a seventh lens element L7 with positive refractive power, and an eighth lens element L8 with negative refractive power. Fig. 6 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the third embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.

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

TABLE 5

TABLE 6

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

fourth embodiment

Referring to fig. 7 and 8, in the fourth embodiment, the optical system 10 includes, in order from the object side to the image side, 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 positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, a seventh lens element L7 with positive refractive power, and an eighth lens element L8 with negative refractive power. Fig. 8 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the fourth embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.

The object-side surface S15 of the eighth lens element L8 is concave along the optical axis, and the image-side surface S16 is concave along the optical axis; the object side S15 is convex at the circumference, and the image side S16 is concave at the circumference.

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

TABLE 7

TABLE 8

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

fifth embodiment

Referring to fig. 9 and 10, in the fifth embodiment, the optical system 10 includes, in order from the object side to the image side, 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 negative refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, a seventh lens element L7 with positive refractive power, and an eighth lens element L8 with negative refractive power. Fig. 10 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the fifth embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.

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

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

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

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

TABLE 9

Watch 10

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

sixth embodiment

Referring to fig. 11 and 12, in the sixth embodiment, the optical system 10 includes, in order from the object side to the image side, 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 positive refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with negative refractive power, a seventh lens element L7 with positive refractive power, and an eighth lens element L8 with negative refractive power. Fig. 12 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the sixth embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.

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

The object-side surface S15 of the eighth lens element L8 is concave along the optical axis, and the image-side surface S16 is concave along the optical axis; object side S15 is concave at the circumference, and image side S16 is convex at the circumference.

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

TABLE 11

TABLE 12

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

seventh embodiment

Referring to fig. 13 and 14, in the seventh embodiment, the optical system 10 includes, in order from the object side to the image side, 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 positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, a seventh lens element L7 with positive refractive power, and an eighth lens element L8 with negative refractive power. Fig. 14 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the seventh embodiment, wherein the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.

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

Watch 13

TABLE 14

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

referring to fig. 15, in an embodiment provided in the present application, the optical system 10 and the photosensitive element 210 are assembled to form the image capturing module 20, and the photosensitive element 210 is disposed on the image side of the eighth lens element L8, i.e., on the image side of the optical system 10. Generally, the photosensitive surface of the photosensitive element 210 overlaps with the image forming surface S19 of the optical system 10. An infrared cut filter L9 is further provided between the eighth lens L8 and the photosensitive element 210 in this embodiment. The photosensitive element 210 may be a CCD (Charge coupled device) or a CMOS (Complementary Metal Oxide Semiconductor). By adopting the optical system 10, the light flux of the system and the size of the photosensitive surface of the photosensitive element 210 can be reasonably configured, so that the shooting quality of the module in a dark light environment can be effectively improved.

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

Referring to fig. 16, some embodiments of the present disclosure further provide an electronic device 30, and the camera module 20 is applied to the electronic device 30 to enable the electronic device 30 to have a camera function. Specifically, the electronic device 30 includes a fixing member 310, the camera module 20 is mounted on the fixing member 310, and the fixing member 310 may be a circuit board, a middle frame, or the like. The electronic device 30 may be, but is not limited to, a smart phone, a smart watch, an e-book reader, a vehicle-mounted camera, a monitoring device, a medical device (such as an endoscope), a tablet computer, a biometric device (such as a fingerprint recognition device or a pupil recognition device), a PDA (Personal Digital Assistant), an unmanned aerial vehicle, and the like. Specifically, in some embodiments, the electronic device 30 is a smart phone, the smart phone includes a middle frame and a circuit board, the circuit board is disposed in the middle frame, the camera module 20 is installed in the middle frame of the smart phone, and the light sensing element 210 is electrically connected to the circuit board. The camera module 20 can be used as a front camera module or a rear camera module of the smart phone. By adopting the camera module 20 provided by the embodiment of the application, the electronic device 30 can have excellent shooting quality when shooting dim light scenes such as night scenes, starry sky scenes and the like.

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 third lens element with refractive power;

a fourth lens element with refractive power;

a fifth lens element with refractive power;

a sixth lens element with negative refractive power;

the optical system satisfies the following relationship:

0.2＜DL/Imgh＜0.5；

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

0＜sin(FOV)/TTL＜0.2；

the FOV is the maximum field angle of the optical system, the TTL is the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis, and the unit of the TTL is mm.

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

Fno/TTL＜0.5；

wherein, Fno is the f-number of the optical system, TTL is the distance from the object-side surface of the first lens element to the imaging surface of the optical system on the optical axis, and the unit of TTL is mm.

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

0.1≤BFL/TTL＜0.4；

the BFL is a shortest distance from an image side surface of the eighth lens element to an imaging surface of the optical system in a direction parallel to the optical axis, and the TTL is a distance from an object side surface of the first lens element to the imaging surface of the optical system in the optical axis.

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

-4＜f6/f7＜0；

wherein f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

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

0.2＜DL/TTL＜1；

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

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

TTL/Imgh＜1；

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

1.0＜TTL/f＜2.0；

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

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

0＜R11/R12＜3.5；

wherein R11 is a radius of curvature of an object-side surface of the sixth lens element at an optical axis, and R12 is a radius of curvature of an image-side surface of the sixth lens element at the optical axis.

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

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