CN111948788A

CN111948788A - Optical lens assembly, lens module and electronic equipment

Info

Publication number: CN111948788A
Application number: CN202010933411.1A
Authority: CN
Inventors: 蔡雄宇; 赵迪; 兰宾利; 周芮
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Tianjin OFilm Opto Electronics Co Ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2020-11-17

Abstract

The application discloses an optical lens group, a lens module and an electronic device. The optical lens assembly includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. Wherein, the optical lens group is provided with a diaphragm on the optical axis, the total optical system length of the optical lens group is TTL, the focal length of the optical lens group is f, and TTL and f satisfy the conditional expression 12< TTL/f < 13. The optical lens group achieves balance between miniaturization and high pixel of the optical system, enables the optical system to keep good optical performance, and can well capture details of a shot object. And by limiting the relation between the total optical length of the optical system and the focal length of the optical system, the total optical length of the optical system is reasonably controlled while the field angle range of the optical system is met, and the characteristic of miniaturization of the optical system can be met.

Description

Optical lens assembly, lens module and electronic equipment

Technical Field

The application relates to the technical field of optical imaging, in particular to an optical lens group, a lens module and electronic equipment.

Background

The camera is widely used in a plurality of fields such as mobile phones, vehicles, monitoring, security protection, medical treatment and the like. However, with the development of scientific technology, the demand of the market for the camera is higher and higher. For example, with the continuous development of the technology in the automobile industry, the market has higher and higher requirements for vehicle-mounted cameras such as Advanced Driving Assistance Systems (ADAS) and reverse images. People hope that the ADAS system and the camera of the image for backing a car can also have the characteristic of high-definition imaging under the condition of obtaining a larger field angle, so that the safety driving of a driver is guaranteed in the driving and backing processes. In order to obtain a large field angle and clear imaging at the same time, the lens in the related art is often assembled by matching a plurality of lenses, so that the assembled lens has a large size.

Disclosure of Invention

The application provides an optical lens group, camera lens module and electronic equipment considers optimizing optical lens group structure, realizes the miniaturized design of optical lens group when satisfying the high definition and shoot the demand.

In a first aspect, an optical lens assembly includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens has negative focal power, the second lens has negative focal power, the third lens has positive focal power, the curvature radius of the object side surface of the third lens at the optical axis is positive, and the curvature radius of the image side surface of the third lens at the optical axis is negative; the fourth lens has positive focal power, the curvature radius of the object side surface of the fourth lens at the optical axis is positive, and the curvature radius of the image side surface of the fourth lens at the optical axis is negative; the fifth lens has negative focal power, the sixth lens has positive focal power, the curvature radius of the object side surface of the sixth lens at the optical axis is positive, and the curvature radius of the image side surface of the sixth lens at the optical axis is negative. Wherein, TTL is the distance on the optical axis from the object side surface of the first lens element to the image plane, f is the focal length of the optical lens group, and TTL and f satisfy the following conditional expression: 12< TTL/f < 13.

Based on the optical lens group of the embodiment of the application, the optical system can balance miniaturization and high pixel of the optical system, so that the optical system keeps good optical performance, and the details of a shot object can be well captured. And by defining the relation between the total optical length of the optical system (the optical system is understood as the optical lens group in the embodiment of the application) and the focal length of the optical system, the total optical length of the optical system is reasonably controlled while the field angle range of the optical system is met, and the characteristic of miniaturization of the optical system can be met. If the upper limit (13) of the conditional expression is exceeded, the total length of the optical system is too long, which is not favorable for miniaturization of the optical system. If the optical system focal length exceeds the conditional expression lower limit (12), it is not favorable to satisfy the field angle range of the optical system, and sufficient object space information cannot be obtained.

In some embodiments, at least one of the lenses of the optical lens assembly has an aspheric object-side surface and an aspheric image-side surface.

Based on the above embodiments, the aspherical lens has a feature that the curvature from the center of the lens to the periphery of the lens is continuously changed. Unlike a spherical lens with a constant curvature, an aspherical lens has better curvature radius characteristics, and can improve the problems of distortion aberration and astigmatic aberration. After the optical lens group adopts the aspheric lens, the aberration generated when the optical lens group images can be effectively eliminated, thereby improving the imaging quality of the optical lens group.

In some embodiments, the thickness of the third lens along the optical axis is CT3, and satisfies the following conditional expression: 1< CT3< 2.

Based on the above embodiment, the change of the center thickness of the third lens element affects the effective focal length of the optical system, and the center thickness of the third lens element is reasonably matched, so that the tolerance sensitivity of the center thickness of the third lens element and the difficulty of the processing technique of the single lens element can be reduced, the assembly yield of the lens assembly can be improved, and the production cost can be further reduced.

In some of these embodiments, the image-side surface of the fourth lens is cemented to the object-side surface of the fifth lens, and the radius of curvature of the image-side surface of the fourth lens at the optical axis is negative.

Based on the above embodiment, not only can the assembling convenience of the optical lens group of the embodiment of the present application be improved, but also the lens performance unevenness can be suppressed, and the production yield of the optical lens group can be improved.

In some of the embodiments, the focal length of the first lens is f1, the focal length of the second lens is f2, and f1, f1 and f satisfy the following conditional expression: -4.5< (f1-f2)/f < -2.

Based on the above-described embodiment, by satisfying the definition of the conditional expressions, the focal powers of the first lens and the second lens do not become excessively strong, which is advantageous for suppressing the occurrence of high-order aberration caused by the peripheral light beam of the imaging region and suppressing the occurrence of chromatic aberration to realize high resolution performance of the lens system.

In some embodiments, the distance on the optical axis between the image-side surface of the first lens and the object-side surface of the second lens is d12, and d12 and f satisfy the following conditional expression: 1< d12/f <2.

Based on the above-described embodiment, by satisfying the upper limit (2) of the conditional expression, the degree of beam expansion diverged via the first lens can be controlled, the condensing pressure of the subsequent lens group is reduced, and therefore aberration correction can be performed well. And by satisfying the lower limit (1) of the conditional expression, the light beam can be sufficiently diverged to enter the second lens, so that a lens system having a strong power can be easily achieved, and the off-axis aberration of the optical system can be further corrected. In addition, the air space between the first lens and the second lens is limited, so that the optical system is beneficial to the characteristics of compactness and miniaturization.

In some of these embodiments, the focal length of the third lens is f3, and f3 and f satisfy the conditional expression: 4.2< f3/f < 5.5.

Based on the above embodiment, since the light beams are emitted from the first lens and the second lens with strong negative power, and the peripheral light beams are incident on the image plane, a large curvature of field is easily generated. Therefore, by arranging the third lens with positive focal power, the correction of the peripheral aberration is facilitated, and the imaging resolution is improved. If the range of the relational expression is exceeded, the correction of the aberration of the optical system is not favorable, and the imaging quality is reduced.

In some embodiments, the focal length of the third lens is f3, the thickness of the third lens on the optical axis is CT3, and f3 and CT3 satisfy the following conditional expression: 3.5< f3/CT3< 5.

Based on the above embodiment, the change of the center thickness of the third lens element affects the effective focal length of the optical system, and the relationship between the center thickness of the third lens element and the effective focal length of the optical system is reasonably matched, so that the tolerance sensitivity of the center thickness of the third lens element and the difficulty of the processing technology of the single lens element can be reduced, the assembly yield of the lens assembly can be improved, and the production cost can be further reduced. If the thickness exceeds the conditional upper limit (5), the lens system is too sensitive to the central thickness of the third lens, and the processing of the single lens is difficult to meet the required tolerance requirement, so that the assembly yield of the lens system is reduced, and the reduction of the production cost is not facilitated. If the optical performance is satisfied when the value exceeds the lower limit of the conditional expression (3.5), the central thickness of the third lens is too large, and the central thickness of the third lens is larger and the weight of the lens is larger due to the higher density of the glass lens, which is not favorable for the light-weight characteristic of the imaging lens group.

In some embodiments, the thickness of the third lens element along the optical axis is CT3, the distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element along the optical axis is d34, and CT3, d34, and f satisfy the following conditional expressions: 1.5< (CT3+ d34)/f < 2.5.

Based on the embodiment, by satisfying the upper limit (2.5) of the relational expression, the problem of too large air space distance between the third lens and the fourth lens on the optical axis can be avoided, thereby being beneficial to realizing system miniaturization. By satisfying the lower limit (1.5) of the relational expression, on the premise of satisfying the optical performance of the system, the central thickness of the third lens and/or the distance between the third lens and the fourth lens on the air space on the optical axis are increased, which is beneficial to the correction of the aberration of the system and improves the imaging quality of the system.

In some embodiments, the focal length of the sixth lens is f6, the thickness of the sixth lens on the optical axis is CT6, and f6 and CT6 satisfy the following conditional expression: 2< f6/CT6< 3.5.

Based on the above embodiment, the change of the center thickness of the sixth lens may affect the effective focal length of the optical system, and the relationship between the center thickness of the sixth lens and the effective focal length of the optical system is reasonably matched, so that the sixth lens has sufficient focal power, which is beneficial to reducing the exit angle of the light beam exiting the lens group, further reducing the angle of the light beam entering the photosensitive element, and improving the photosensitive performance of the imaging photosensitive element. If the focal length of the sixth lens exceeds the upper limit of the conditional expression (3.5), and the focal length is too long and the focal power is insufficient, the angle of the light beam entering the photosensitive element is large, so that the photosensitive element is insufficient in information for identifying the object to be shot, and the phenomenon of imaging distortion occurs. If the optical performance of the lens exceeds the lower limit (2), the thickness of the center of the sixth lens is too large, and the plastic lens is sensitive to thermal deformation, so that the thermal stability of the optical system is reduced.

In some embodiments, the horizontal field angle of the optical lens assembly is FOV, the image height corresponding to the maximum field angle of the optical lens assembly is Imgh, and FOV, f, and Imgh satisfy the following conditional expression: 50 ° < (FOV x f)/Imgh <61 °.

Based on the embodiment, the optical performance of the optical system can be kept good by satisfying the conditional expression, the characteristic of high pixel of the optical system is realized, and the details of the shot object can be captured well.

In some embodiments, the combined focal length of the fourth lens and the fifth lens is f45, the thickness of the fourth lens on the optical axis is CT5, the thickness of the fifth lens on the optical axis is CT5, and f45, CT4 and CT5 satisfy the following conditional expression: 3.5< f45/(CT4-CT5) < 10.5.

Based on the above embodiment, by reasonably matching the thickness relationship between the fourth lens and the fifth lens, the focal powers of the two lenses, i.e., the positive lens and the negative lens, can be reasonably matched, so that the aberration can be corrected with each other, and the fourth lens and the fifth lens can provide the minimum aberration contribution ratio for the optical system. If the thickness difference between the centers of the fourth lens and the fifth lens exceeds the lower limit (3.5) of the conditional expression, the gluing process is not facilitated, and meanwhile, in an environment with large variation of high and low temperature environments, the cold and hot deformation difference generated due to the thickness difference is large, and phenomena such as glue crack or glue failure are easily generated. If the combined focal length of the fourth lens element and the fifth lens element exceeds the upper limit (10.5) of the conditional expression, the lens assembly is prone to generate a severe astigmatism phenomenon, which is not favorable for improving the imaging quality.

In a second aspect, an embodiment of the present application provides a lens module, which includes a light-sensing element and any one of the optical lens assemblies described above, wherein a light-sensing surface of the light-sensing element is located on an image plane of the optical lens assembly. The optical lens group is used for receiving a light signal of a shot object and projecting the light signal to the photosensitive element, and the photosensitive element is used for converting the light signal corresponding to the shot object into an image signal.

Based on the lens module of this application embodiment, the lens module has good optical property, and the details of the object of shooing can be fine catch.

In a third aspect, an embodiment of the present application provides an electronic device, including the lens module described above.

Based on the lens module of this application embodiment, the lens module has good formation of image effect, is favorable to proposing the product quality of electronic equipment and user's use experience.

The present application provides an optical lens assembly, a lens module and an electronic apparatus, the optical lens assembly includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens has negative focal power, the second lens has negative focal power, the third lens has positive focal power, the curvature radius of the object side surface of the third lens at the optical axis is positive, and the curvature radius of the image side surface of the third lens at the optical axis is negative; the fourth lens has positive focal power, the curvature radius of the object side surface of the fourth lens at the optical axis is positive, and the curvature radius of the image side surface of the fourth lens at the optical axis is negative; the fifth lens has negative focal power, the sixth lens has positive focal power, the curvature radius of the object side surface of the sixth lens at the optical axis is positive, and the curvature radius of the image side surface of the sixth lens at the optical axis is negative. Wherein, the optical lens group is provided with a diaphragm on the optical axis, the total optical system length of the optical lens group is TTL, the focal length of the optical lens group is f, and TTL and f satisfy the conditional expression 12< TTL/f < 13. The optical lens group achieves balance between miniaturization and high pixel of the optical system, enables the optical system to keep good optical performance, and can well capture details of a shot object. And by defining the relation between the total optical length of the optical system (the optical system is understood as the optical lens group in the embodiment of the application) and the focal length of the optical system, the total optical length of the optical system is reasonably controlled while the field angle range of the optical system is met, and the characteristic of miniaturization of the optical system can be met.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of an optical lens assembly according to a first embodiment of the present application;

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

FIG. 3 is a schematic view of an optical lens assembly according to a second embodiment of the present application;

FIG. 4 is a schematic diagram of a spherical aberration curve, an astigmatism curve and a distortion curve of an optical lens assembly according to a second embodiment of the present application;

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

FIG. 6 is a schematic diagram of a spherical aberration curve, an astigmatism curve and a distortion curve of an optical lens assembly according to a third embodiment of the present application;

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

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

FIG. 9 is a schematic structural diagram of an optical lens assembly according to a fifth embodiment of the present application;

fig. 10 is a schematic diagram of a spherical aberration curve, an astigmatism curve and a distortion curve of an optical lens assembly according to a fifth embodiment of the present application.

It is to be noted that in the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for the convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, 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 purely diagrammatic and not drawn to scale.

The attached drawings indicate the following:

e1, first lens, E2, second lens, E3, third lens, ST, stop, E4, fourth lens, E5, fifth lens, E6, sixth lens, E7, protective glass, S1, object side surface of first lens, S2, image side surface of first lens, S3, object side surface of second lens, S4, image side surface of second lens, S5, object side surface of third lens, S6, image side surface of third lens, S7, object side surface of fourth lens, S8, image side surface of fourth lens, S9, object side surface of fifth lens, S10, image side surface of fifth lens, S11, object side surface of sixth lens, S12, image side surface of sixth lens, S13, first surface of protective glass, S14, second surface of protective glass, S15, imaging surface.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Cameras in the related art are widely used in a plurality of fields including but not limited to mobile phones, vehicles, monitoring, security, medical treatment and the like. However, with the development of scientific technology, the demand of the market for the camera is higher and higher. For example, with the continuous development of the technology in the automobile industry, the market has higher and higher requirements for vehicle-mounted cameras such as Advanced Driving Assistance Systems (ADAS) and reverse images.

In the process of implementing a camera based on the related art, the inventor finds that the camera lens in the related art is difficult to simultaneously meet shooting and clear imaging in a large angle range, so that early warning is difficult to accurately make in real time, and a driving risk is caused.

In order to solve the above technical problem, an optical lens assembly includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. It should be noted that the object side of the optical lens assembly is understood as the side of the optical lens assembly facing the object when the object is captured. The image side is understood to be a side of the optical lens assembly that images the reflected light of the object to be photographed (located on the object side) passing through the light inlet on the image plane.

Wherein the first lens has a negative power (having the ability to diverge light), and the second lens has a negative power. The third lens has positive power (having the capability of converging light), the curvature radius of the object-side surface of the third lens at the optical axis is positive (the curvature radius of the object-side surface at the optical axis is positive, so that the surface shape is a convex surface), and the curvature radius of the image-side surface of the third lens at the optical axis is negative (the curvature radius of the image-side surface at the optical axis is negative, so that the surface shape is a convex surface). The fourth lens has positive focal power, the curvature radius of the object side surface of the fourth lens at the optical axis is positive, and the curvature radius of the image side surface of the fourth lens at the optical axis is negative. The fifth lens has negative focal power, the sixth lens has positive focal power, the curvature radius of the object side surface of the sixth lens at the optical axis is positive, and the curvature radius of the image side surface of the sixth lens at the optical axis is negative. Wherein, TTL is the distance on the optical axis from the object side surface of the first lens element of the optical lens group to the image plane, the focal length of the optical lens group is f, and TTL and f satisfy the conditional expression: 12< TTL/f < 13.

The optical lens group in the embodiment of the application can balance miniaturization and high pixel of the optical system, so that the optical system keeps good optical performance, and the details of a shot object can be well captured. And by defining the relation between the total optical length of the optical system (the optical system is understood as the optical lens group in the embodiment of the application) and the focal length of the optical system, the total optical length of the optical system is reasonably controlled while the field angle range of the optical system is met, and the characteristic of miniaturization of the optical system can be met. If the optical system exceeds the conditional upper limit (13), the total length of the optical system is too long, which is not beneficial to the miniaturization of the optical system; if the optical system focal length exceeds the conditional expression lower limit (12), it is not favorable to satisfy the field angle range of the optical system, and sufficient object space information cannot be obtained.

In the embodiment of the present application, the surface shape of the lens is described using positive and negative values of the curvature radius, and when the curvature radius of the object-side surface of the lens is positive, the surface shape of the object-side surface is convex, and when the curvature radius of the object-side surface of the lens is negative, the surface shape of the object-side surface is concave. The image side surface of the lens has a concave surface when the curvature radius of the image side surface is positive, and has a convex surface when the curvature radius of the image side surface of the lens is negative. However, the use of positive and negative values of the curvature radius for describing the surface shape of the lens is relatively abstract and not easy to understand, and therefore, in the embodiments described below, the surface shape of the lens is directly defined by a concave surface or a convex surface to facilitate understanding.

In the embodiments of the above application, the object-side surface and the image-side surface of at least one lens element in the optical lens group are aspheric.

The aspherical lens has a characteristic that the curvature from the center of the lens to the periphery of the lens is continuously varied. Unlike a spherical lens with a constant curvature, an aspherical lens has better curvature radius characteristics, and can improve the problems of distortion aberration and astigmatic aberration. After the optical lens group adopts the aspheric lens, the aberration generated when the optical lens group images can be effectively eliminated, thereby improving the imaging quality of the optical lens group.

In order to improve the product quality of the optical lens assembly, in the embodiment of the present application, the thickness of the third lens element on the optical axis is CT3, and satisfies the following conditional expression: 1< CT3< 2.

The change of the central thickness of the third lens can affect the effective focal length of the optical system, and the central thickness of the third lens is reasonably matched, so that the tolerance sensitivity of the central thickness of the third lens and the processing difficulty of a single lens can be reduced, the assembly yield of the lens group can be improved, and the production cost can be further reduced.

In this embodiment, the image-side surface of the fourth lens element may be cemented with the object-side surface of the fifth lens element, and the curvature radius of the image-side surface of the fourth lens element at the optical axis is negative.

The image-side surface of the fourth lens element can be cemented with the object-side surface of the fifth lens element, which not only improves the convenience of assembling the optical lens assembly of the embodiment of the present application, but also suppresses the non-uniformity of the lens performance and improves the production yield of the optical lens assembly.

In the embodiment of the present application, the focal length of the first lens is f1, the focal length of the second lens is f2, and f1, f2 and f satisfy the following conditional expression: -4.5< (f1-f2)/f < -2.

Based on the above application embodiments, by satisfying the restrictions of the conditional expressions, the focal powers of the first lens and the second lens do not become too strong, which is beneficial to suppressing the occurrence of high-order aberration caused by the peripheral light beam of the imaging region, and suppressing the occurrence of chromatic aberration to realize high resolution performance of the lens system.

In order to perform aberration correction well, in the embodiment of the present application, the distance between the image-side surface of the first lens and the object-side surface of the second lens on the optical axis is d12, and d12 and f satisfy the conditional expression: 1< d12/f <2.

By satisfying the upper limit (2) of the above conditional expression, the degree of beam expansion diverged through the first lens can be suppressed without lowering the condensing pressure of the subsequent lens group, and therefore aberration correction can be performed well. And by satisfying the lower limit (1) of the conditional expression, the light beam can be sufficiently diverged to enter the second lens, so that a lens system having a strong power can be easily achieved, and the off-axis aberration of the optical system can be further corrected. In addition, the air space between the first lens and the second lens is limited, so that the optical system is beneficial to the characteristics of compactness and miniaturization.

In the embodiment of the present application, the focal length of the third lens is f3, and f3 and f satisfy the following conditional expression: 4.2< f3/f < 5.5.

Because the light rays are emitted by the first lens and the second lens with stronger negative focal power, and the marginal light rays are incident on the image surface and are easy to generate larger field curvature. Therefore, by arranging the third lens with positive focal power, the correction of the peripheral aberration is facilitated, and the imaging resolution is improved. If the range of the relational expression is exceeded, the correction of the aberration of the optical system is not favorable, and the imaging quality is reduced.

In the present embodiment, the thickness of the third lens element along the optical axis is CT3, the distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element along the optical axis is d34, and CT3, d34 and f satisfy the following conditional expression: 1.5< (CT3+ d34)/f < 2.5.

In the above embodiment, by satisfying the upper limit (2.5) of the relation, the thickness of the third lens and/or the air space between the third lens and the fourth lens on the optical axis may be prevented from being too large, thereby facilitating the system miniaturization. By satisfying the lower limit (1.5) of the relational expression, on the premise of satisfying the optical performance of the system, the central thickness of the third lens and/or the distance between the third lens and the fourth lens on the air space on the optical axis are increased, which is beneficial to the correction of the aberration of the system and improves the imaging quality of the system.

Also, in some embodiments, the focal length of the sixth lens is f6, the thickness of the sixth lens on the optical axis is CT6, and f6 and CT6 satisfy the conditional expression: 2< f6/CT6< 3.5.

According to the embodiment of the application, the effective focal length of the optical system can be influenced by the change of the center thickness of the sixth lens, and the relationship between the center thickness of the sixth lens and the effective focal length of the optical system is reasonably matched, so that the sixth lens has enough focal power, the emergent angle of the light beam emergent lens group is favorably reduced, the angle of the light beam incident to the photosensitive element is further reduced, and the photosensitive performance of the imaging photosensitive element is improved. If the focal length of the sixth lens exceeds the upper limit of the conditional expression (3.5), and the focal length is too long and the focal power is insufficient, the angle of the light beam entering the photosensitive element is large, so that the photosensitive element is insufficient in information for identifying the object to be shot, and the phenomenon of imaging distortion occurs. If the optical performance of the lens exceeds the lower limit (2), the thickness of the center of the sixth lens is too large, and the plastic lens is sensitive to thermal deformation, so that the thermal stability of the optical system is reduced.

In order to ensure the optical performance of the optical lens assembly, in the embodiment of the present application, the horizontal field angle of the optical lens assembly is FOV, the image height corresponding to the maximum field angle of the optical lens assembly is Imgh, and the FOV, f, and Imgh satisfy the conditional expression: 0 ° < (FOV x f)/Imgh <61 °.

Satisfying the conditional expression can maintain good optical performance of the optical system, realize the high pixel characteristic of the optical system, and can capture the details of the shot object well.

Meanwhile, the combined focal length of the fourth lens element and the fifth lens element is f45, the optical thickness of the fourth lens element is CT5, the optical thickness of the fifth lens element is CT5, and f45, CT4 and CT5 satisfy the following conditional expressions: 3.5< f45/(CT4-CT5) < 10.5.

In the embodiment of the present application, the thickness relationship between the fourth lens and the fifth lens is reasonably matched, so that the focal powers of the two lenses, i.e., the positive lens and the negative lens, can be reasonably matched, thereby performing mutual aberration correction, and facilitating the provision of the minimum aberration contribution ratio for the optical system by the fourth lens and the fifth lens. If the thickness difference between the centers of the fourth lens and the fifth lens exceeds the lower limit (3.5) of the conditional expression, the gluing process is not facilitated, and meanwhile, in an environment with large variation of high and low temperature environments, the cold and hot deformation difference generated due to the thickness difference is large, and phenomena such as glue crack or glue failure are easily generated. If the combined focal length of the fourth lens element and the fifth lens element exceeds the upper limit (10.5) of the conditional expression, the lens assembly is prone to generate a severe astigmatism phenomenon, which is not favorable for improving the imaging quality.

The present application further provides a lens module, which includes a photosensitive element and the above optical lens assembly, wherein the photosensitive surface of the photosensitive element is located on the imaging surface of the optical lens assembly. The photosensitive element may be a photosensitive coupling element (CCD) or a Complementary Metal Oxide Semiconductor (CMOS), among others. The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone.

The present application further provides an electronic device including the lens module described above.

Specific examples of the optical lens group applicable to the above embodiments are further described below with reference to the drawings.

Example one

In this embodiment, referring to fig. 1, the optical lens assembly includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a stop ST, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective mirror E7, and an image forming surface S15.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element E1 is convex along the optical axis, and the image-side surface S2 of the first lens element E1 is concave along the optical axis. It is to be noted that both the object side and the image side of the present application can be understood as the optically active area of the lens. In the present specification, when the optical axis is a region near the optical axis, and a surface shape of a lens surface at the optical axis is described, the surface shape of the lens surface at least at the optical axis is represented, a surface of each lens closest to a subject is referred to as an object side surface of the lens, and a surface of each lens closest to an image plane is referred to as an image side surface of the lens.

The second lens element E2 has negative power, and the object-side surface S3 of the second lens element E2 is concave along the optical axis, and the image-side surface S4 of the second lens element E2 is concave along the optical axis.

The third lens element E3 has positive power, the object-side surface S5 of the third lens element E3 is convex along the optical axis, and the image-side surface S6 of the third lens element E3 is convex along the optical axis.

The fourth lens element E4 has positive power, the object-side surface S7 of the fourth lens element E4 is convex along the optical axis, and the image-side surface S8 of the fourth lens element E4 is convex along the optical axis.

The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element E5 is concave along the optical axis, and the image-side surface S10 of the fifth lens element E5 is concave along the optical axis.

The sixth lens element E6 has positive refractive power, and the object-side surface S11 of the sixth lens element E6 is convex along the optical axis, and the image-side surface S12 of the sixth lens element E6 is convex along the optical axis.

The protective mirror E7 has a first surface S13 facing the sixth lens E6 and a second surface S14 facing away from the sixth lens E6. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this embodiment, the refractive index and abbe number are referenced to light with a wavelength of 587.00nm, the focal length is referenced to light with a wavelength of 546.07nm, and the relevant parameters of the optical lens assembly are shown in table 1. Wherein f represents the effective focal length of the optical lens assembly, FNO represents the aperture value, and FOV represents the field angle of the optical lens assembly in the diagonal direction, and it should be noted that the focal length, the curvature radius, and the thickness are all in millimeters.

TABLE 1

In the table, the numerical value 11.082 of the radius of curvature of the object-side surface S1 at the optical axis is represented as that the radius of curvature of the object-side surface S1 of the first lens element E1 is positive (i.e., the object-side surface S1 of the first lens element E1 facing the object side of the optical system is convex). The numerical value 3.797 of the radius of curvature of the image-side surface S2 at the optical axis in the table indicates that the radius of curvature of the image-side surface S2 of the first lens E1 is positive (i.e., the image-side surface S2 of the first lens E1 facing the image side of the optical system is concave). The thickness of the object-side surface S1 in the table is 0.950, which is represented by the distance from the object-side surface S1 to the image-side surface S2 of the first lens element E1 along the optical axis, and it can also be understood that the center thickness of the first lens element along the optical axis is 0.950 mm. The thickness value corresponding to the image-side surface S2 in the table is 1.820, which means that the distance from the image-side surface S2 of the first lens E1 to the object-side surface S3 of the second lens E2 on the optical axis is 1.820mm, and it can also be understood that the air gap between the first lens E1 and the second lens E2 is 1.820 mm. The refractive index of the first lens E1 was 1.835, and the abbe number of the first lens E1 was 42.7. The above description is given only by taking data of the first lens E1 as an example, and the understanding of the table data of the second to sixth lenses and the protective glasses is the same as that of the first lens, and the table contents of the following second to fifth embodiments are the same as that of the first embodiment, so that the description thereof is omitted.

The calculation results of the numerical relationship between the parameters of the optical lens assembly in this embodiment according to the parameters in table 1 are shown in table 2.

TABLE 2

Conditional formula (II)	Numerical value	Conditional formula (II)	Numerical value
				TTL/f	12.114	f3/CT3	4.411
CT3	1.178	(CT3+d34)/f	1.871
				(f1-f2)/f	-4.158	f6/CT6	2.287
d12/f	1.542	(FOV*f)/Imgh	60.582
				f3/f	4.402	f45/(CT4-CT5)	10.113

As can be seen from the results in table 2, the numerical relationship calculation results between the parameters of the optical lens assembly in this embodiment satisfy the numerical ranges defined by the above conditional expressions.

In the first embodiment of the present application, the surface shape x of the lenses of the first lens E1 to the sixth lens E6 can be defined by, but is not limited to, the following aspheric surface formula:

where Z denotes a height in parallel with the Z axis in the lens surface, r denotes a radial distance from the vertex, c denotes a curvature of the surface at the vertex, K denotes a conic constant, and a4, a6, A8, a10, a12, a14, a16, a18, and a20 denote aspheric coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order, 16 th order, 18 th order, and 20 th order, respectively. Table 3 below gives the coefficients of the high-order terms A4, a6, a8, a10, a12, a14, a16, a18, and a20 of the mirrors S3, S4, S8, S9, S10, S11, and S12 that can be used in example one.

TABLE 3

Number of noodles

S3

S4

S8

S9

S10

S11

S12

K

9.57E+01

-8.65E-01

3.67E+00

1.67E-01

1.21E+01

-1.18E+00

5.14E-02

A4

7.39E-03

7.70E-03

-2.24E-02

-2.68E-01

-9.01E-02

-9.58E-02

8.55E-03

A6

-5.28E-03

8.02E-02

1.67E-01

1.45E+00

2.72E-01

1.41E-01

-4.07E-02

A8

1.31E-03

-1.82E-01

-9.03E-01

-4.88E+00

-5.00E-01

-1.56E-01

8.03E-02

A10

-7.34E-05

2.26E-01

2.86E+00

1.00E+01

6.12E-01

1.05E-01

-9.23E-02

A12

-4.62E-05

-1.74E-01

-5.62E+00

-1.33E+01

-4.94E-01

-3.06E-02

6.71E-02

A14

1.45E-05

8.48E-02

6.90E+00

1.12E+01

2.55E-01

-8.56E-03

-3.12E-02

A16

-2.00E-06

-2.54E-02

-5.15E+00

-5.71E+00

-7.87E-02

1.02E-02

8.93E-03

A18

1.40E-07

4.26E-03

2.13E+00

1.57E+00

1.26E-02

-3.23E-03

-1.44E-03

A20

-4.02E-09

-3.05E-04

-3.76E-01

-1.73E-01

-7.07E-04

3.63E-04

9.96E-05

Fig. 2 shows, from left to right, a spherical aberration curve, an astigmatism curve, and a distortion curve, respectively, in the first embodiment.

The abscissa of the spherical aberration graph represents the focus offset, the ordinate represents the normalized field of view, and the left graph of fig. 2 shows that the focus offsets of different fields of view are within ± 0.05mm when the wavelengths are 656.27nm, 587.56nm, 546.07nm, 479.99nm and 435.83nm, respectively, which indicates that the optical imaging lens in the embodiment has small spherical aberration and good imaging quality.

The abscissa of the astigmatism graph represents focus offset, the ordinate represents field angle, and the astigmatism curve given by the middle graph of fig. 2 represents that when the wavelength is 546.07nm, the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.05mm, which shows that the optical imaging lens in the embodiment has smaller astigmatism and better imaging quality.

The abscissa of the distortion curve graph represents the distortion rate, the ordinate represents the field angle, and the distortion curve given by the right graph in fig. 2 represents that the distortion is within +/-100% when the wavelength is 546.07nm, which shows that the distortion of the optical imaging lens in the embodiment is better corrected and the imaging quality is better.

As can be seen from fig. 2, the optical lens assembly according to the first embodiment can achieve a good imaging effect.

Example two

In the present embodiment, referring to fig. 3, the optical lens assembly includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a stop ST, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective mirror E7, and an image forming surface S15.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element E1 is convex along the optical axis, and the image-side surface S2 of the first lens element E1 is concave along the optical axis.

In this embodiment, the refractive index and abbe number are referenced to light with a wavelength of 587.00nm, the focal length is referenced to light with a wavelength of 546.07nm, and the relevant parameters of the optical lens assembly are shown in table 4. Wherein f represents the effective focal length of the optical lens assembly, FNO represents the aperture value, and FOV represents the field angle of the optical lens assembly in the diagonal direction, and it should be noted that the focal length, the curvature radius, and the thickness are all in millimeters.

TABLE 4

The calculation results of the numerical relationship between the parameters of the optical lens assembly of this embodiment according to the parameters in table 4 are shown in table 5.

TABLE 5

Conditional formula (II)	Numerical value	Conditional formula (II)	Numerical value
				TTL/f	12.071	f3/CT3	4.214
CT3	1.241	(CT3+d34)/f	1.930
				(f1-f2)/f	-4.231	f6/CT6	2.623
d12/f	1.579	(FOV*f)/Imgh	59.584
				f3/f	4.510	f45/(CT4-CT5)	7.114

As can be seen from the results in table 5, the numerical relationship calculation results between the parameters of the optical lens assembly in this embodiment satisfy the numerical ranges defined by the above conditional expressions.

In the second embodiment of the present application, the surface shapes of the lenses of the first lens E1 to the sixth lens E6 can be defined by the above aspheric surface formula, and table 6 below gives the coefficients of high-order terms a4, A6, A8, a10, a12, a14, a16, a18, and a20 of the mirror surfaces S3, S4, S8, S9, S10, S11, and S12 that can be used in the second embodiment.

TABLE 6

Number of noodles

S3

S4

S8

S9

S10

S11

S12

K

5.93E+01

-8.65E-01

2.31E+00

4.55E-01

1.15E+01

-6.66E-01

7.47E-02

A4

6.62E-03

8.92E-03

-2.27E-02

-2.20E-01

-7.68E-02

-8.92E-02

5.49E-03

A6

-5.42E-03

6.86E-02

1.55E-01

9.81E-01

2.05E-01

1.16E-01

-2.47E-02

A8

1.73E-03

-1.58E-01

-7.90E-01

-3.32E+00

-3.34E-01

-1.13E-01

4.50E-02

A10

-3.51E-04

2.01E-01

2.35E+00

6.95E+00

3.63E-01

5.69E-02

-4.74E-02

A12

4.79E-05

-1.60E-01

-4.33E+00

-9.63E+00

-2.56E-01

2.58E-03

3.14E-02

A14

-3.91E-06

8.11E-02

4.97E+00

8.76E+00

1.13E-01

-2.16E-02

-1.34E-02

A16

1.06E-07

-2.51E-02

-3.46E+00

-5.01E+00

-2.93E-02

1.26E-02

3.57E-03

A18

8.52E-09

4.34E-03

1.33E+00

1.62E+00

3.57E-03

-3.27E-03

-5.42E-04

A20

-5.56E-10

-3.19E-04

-2.17E-01

-2.24E-01

-8.48E-05

3.33E-04

3.60E-05

Fig. 4 shows, from left to right, a spherical aberration curve, an astigmatism curve, and a distortion curve in the second embodiment.

The abscissa of the spherical aberration graph represents the focus offset, the ordinate represents the normalized field of view, and the left graph of fig. 4 shows that the focus offsets of different fields of view are within ± 0.05mm when the wavelengths are 656.27nm, 587.56nm, 546.07nm, 479.99nm and 435.83nm, respectively, which indicates that the optical imaging lens in the embodiment has small spherical aberration and good imaging quality.

The abscissa of the astigmatism graph represents focus offset, the ordinate represents field angle, and the astigmatism curve given by the middle graph of fig. 4 represents that when the wavelength is 546.07nm, the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.05mm, which shows that the optical imaging lens in the embodiment has smaller astigmatism and better imaging quality.

The abscissa of the distortion curve graph represents the distortion rate, the ordinate represents the field angle, and the distortion curve given by the right graph in fig. 4 represents that the distortion is within +/-100% when the wavelength is 546.07nm, which shows that the distortion of the optical imaging lens in the embodiment is better corrected and the imaging quality is better.

As can be seen from fig. 4, the optical lens assembly of the second embodiment can achieve a good imaging effect.

EXAMPLE III

In the present embodiment, referring to fig. 5, the optical lens assembly includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a stop ST, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective mirror E7, and an image forming surface S15.

In this embodiment, the refractive index and abbe number are referenced to light with a wavelength of 587.00nm, the focal length is referenced to light with a wavelength of 546.07nm, and the relevant parameters of the optical lens assembly are shown in table 7. Wherein f represents the effective focal length of the optical lens assembly, FNO represents the aperture value, and FOV represents the field angle of the optical lens assembly in the diagonal direction, and it should be noted that the focal length, the curvature radius, and the thickness are all in millimeters.

TABLE 7

The calculation results of the numerical relationship between the parameters of the optical lens assembly according to the present embodiment and the parameters of the optical lens assembly according to table 7 are shown in table 8.

TABLE 8

Conditional formula (II)	Numerical value	Conditional formula (II)	Numerical value
				TTL/f	12.108	f3/CT3	4.325
CT3	1.239	(CT3+d34)/f	1.962
				(f1-f2)/f	-4.108	f6/CT6	2.237
d12/f	1.593	(FOV*f)/Imgh	58.541
				f3/f	4.699	f45/(CT4-CT5)	5.073

As can be seen from the results in table 8, the numerical relationship calculation results between the parameters of the optical lens assembly in this embodiment satisfy the numerical ranges defined by the above conditional expressions.

In the third embodiment of the present application, the surface shapes of the lenses of the first lens E1 to the sixth lens E6 can be defined by the above aspheric surface formula, and the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 of the mirror surfaces S3, S4, S8, S9, S10, S11, and S12 that can be used in the third embodiment are shown in table 9 below.

TABLE 9

Fig. 6 shows, from left to right, a spherical aberration graph, an astigmatism graph, and a distortion graph of the third embodiment.

The abscissa of the spherical aberration graph represents the focus offset, the ordinate represents the normalized field of view, and the left graph of fig. 6 shows that the focus offsets of different fields of view are within ± 0.05mm when the wavelengths are 656.27nm, 587.56nm, 546.07nm, 479.99nm and 435.83nm, respectively, which indicates that the optical imaging lens in the embodiment has small spherical aberration and good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the field angle, and the astigmatism curve given by the middle graph of fig. 6 represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.05mm when the wavelength is 546.07nm, which shows that the optical imaging lens in the embodiment has smaller astigmatism and better imaging quality.

The abscissa of the distortion curve graph represents the distortion rate, the ordinate represents the field angle, and the distortion curve given by the right graph in fig. 6 represents that the distortion is within +/-100% when the wavelength is 546.07nm, which shows that the distortion of the optical imaging lens in the embodiment is better corrected and the imaging quality is better.

As can be seen from fig. 6, the optical lens assembly provided in the third embodiment can achieve a good imaging effect.

Example four

In this embodiment, referring to fig. 7, the optical lens assembly includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a stop ST, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective mirror E7, and an image forming surface S15.

The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element E5 is concave along the optical axis, and the image-side surface S10 of the fifth lens element E5 is convex along the optical axis.

In this embodiment, the refractive index and abbe number are referenced to light with a wavelength of 587.00nm, the focal length is referenced to light with a wavelength of 546.07nm, and the relevant parameters of the optical lens assembly are shown in table 10. Wherein f represents the effective focal length of the optical lens assembly, FNO represents the aperture value, and FOV represents the field angle of the optical lens assembly in the diagonal direction, and it should be noted that the focal length, the curvature radius, and the thickness are all in millimeters.

Watch 10

TABLE 8

Conditional formula (II)	Numerical value	Conditional formula (II)	Numerical value
				TTL/f	12.996	f3/CT3	4.532
CT3	1.165	(CT3+d34)/f	2.163
				(f1-f2)/f	-2.945	f6/CT6	2.900
d12/f	1.734	(FOV*f)/Imgh	51.335
				f3/f	5.280	f45/(CT4-CT5)	3.633

In the fourth embodiment of the present application, the surface shapes of the lenses of the first lens E1 to the sixth lens E6 can be defined by the above aspheric surface formula, and the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 of the mirror surfaces S3, S4, S8, S9, S10, S11, and S12 that can be used in the fourth embodiment are shown in table 12 below.

TABLE 12

In fig. 8, from left to right, a spherical aberration graph, an astigmatism graph and a distortion graph of the fourth embodiment are shown.

The abscissa of the spherical aberration graph represents the focus offset, the ordinate represents the normalized field of view, and the left graph of fig. 8 shows that the focus offsets of different fields of view are within ± 0.05mm when the wavelengths are 656.27nm, 587.56nm, 546.07nm, 479.99nm and 435.83nm, respectively, which indicates that the optical imaging lens in the embodiment has small spherical aberration and good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the field angle, and the astigmatism curve given by the middle graph of fig. 8 represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.05mm when the wavelength is 546.07nm, which shows that the optical imaging lens in the embodiment has smaller astigmatism and better imaging quality.

The abscissa of the distortion curve graph represents the distortion rate, the ordinate represents the field angle, and the distortion curve given by the right graph in fig. 8 represents that the distortion is within +/-100% when the wavelength is 546.07nm, which shows that the distortion of the optical imaging lens in the embodiment is better corrected and the imaging quality is better.

As can be seen from fig. 8, the optical lens group provided in the fourth embodiment can achieve a good imaging effect.

EXAMPLE five

In the present embodiment, as shown in fig. 9, the optical lens assembly includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a stop ST, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective mirror E7, and an image forming surface S15.

In this embodiment, the refractive index and abbe number are referenced to light with a wavelength of 587.00nm, the focal length is referenced to light with a wavelength of 546.07nm, and the relevant parameters of the optical lens assembly are shown in table 13. Wherein f represents the effective focal length of the optical lens assembly, FNO represents the aperture value, and FOV represents the field angle of the optical lens assembly in the diagonal direction, and it should be noted that the focal length, the curvature radius, and the thickness are all in millimeters.

Watch 13

The calculation results of the numerical relationship between the parameters of the optical lens assembly according to the present embodiment and the parameters of the optical lens assembly according to the parameters in table 13 are shown in table 14.

TABLE 14

Conditional formula (II)	Numerical value	Conditional formula (II)	Numerical value
				TTL/f	12.302	f3/CT3	4.028
CT3	1.339	(CT3+d34)/f	2.110
				(f1-f2)/f	-3.918	f6/CT6	2.938
d12/f	1.553	(FOV*f)/Imgh	55.432
				f3/f	4.995	f45/(CT4-CT5)	3.380

As can be seen from the results in table 14, the numerical relationship calculation results of the lens parameters of the optical lens assembly in this embodiment satisfy the numerical ranges defined by the above conditional expressions in a one-to-one correspondence.

In the fifth embodiment of the present application, the surface shapes of the lenses of the first lens E1 to the sixth lens E6 can be defined by the above aspheric surface formula, and the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 of the mirror surfaces S3, S4, S8, S9, S10, S11, and S12 that can be used in the fifth embodiment are shown in table 15 below.

Watch 15

Fig. 10 shows, from left to right, a spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the fifth embodiment, respectively.

The abscissa of the spherical aberration graph represents the focus offset, the ordinate represents the normalized field of view, and the wavelengths given in the left graph of fig. 10 are 656.27nm, 587.56nm, 546.07nm, 479.99nm and 435.83nm, respectively, when the focus offsets of different fields of view are within ± 0.05mm, which indicates that the optical imaging lens in the embodiment has small spherical aberration and good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the field angle, and the astigmatism curve given by the middle graph of fig. 10 represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.05mm when the wavelength is 546.07nm, which shows that the optical imaging lens in the embodiment has smaller astigmatism and better imaging quality.

The abscissa of the distortion curve graph represents the distortion rate, the ordinate represents the field angle, and the distortion curve given by the right graph in fig. 10 represents that the distortion is within +/-100% when the wavelength is 546.07nm, which shows that the distortion of the optical imaging lens in the embodiment is better corrected and the imaging quality is better.

As can be seen from fig. 10, the optical lens group given in the fifth embodiment can achieve a good imaging effect.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it is to be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the above terms will be understood by those skilled in the art according to the specific situation.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An optical lens assembly, in order from an object side to an image side along an optical axis, comprising:

a first lens having a negative focal power;

a second lens having a negative focal power;

a third lens having a positive refractive power, a radius of curvature of an object-side surface of the third lens at the optical axis being positive, and a radius of curvature of an image-side surface of the third lens at the optical axis being negative;

a fourth lens having positive refractive power, a radius of curvature of an object-side surface of the fourth lens at the optical axis being positive, and a radius of curvature of an image-side surface of the fourth lens at the optical axis being negative;

a fifth lens having a negative focal power;

the sixth lens has positive focal power, the curvature radius of the object side surface of the sixth lens at the optical axis is positive, and the curvature radius of the image side surface of the sixth lens at the optical axis is negative;

wherein, TTL is a distance from an object-side surface of a first lens element of the optical lens assembly to an image plane on the optical axis, f is a focal length of the optical lens assembly, and TTL and f satisfy the following conditional expressions: 12< TTL/f < 13.

2. The optical lens assembly of claim 1,

the object side surface and the image side surface of at least one lens in the optical lens group are both aspheric surfaces.

3. The optical lens assembly of claim 1,

the thickness of the third lens on the optical axis is CT3, CT3 satisfies the conditional expression: 1< CT3< 2.

4. The optical lens assembly of claim 1,

the image side surface of the fourth lens is glued with the object side surface of the fifth lens, and the curvature radius of the image side surface of the fourth lens at the optical axis is negative.

5. The optical lens assembly of claim 1,

the focal length of the first lens is f1, the focal length of the second lens is f2, and f1, f2 and f satisfy the conditional expression: -4.5< (f1-f2)/f < -2.

6. The optical lens assembly of claim 1,

the distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis is d12, and d12 and f satisfy the following conditional expression: 1< d12/f <2.

7. The optical lens assembly of claim 1,

the third lens has a focal length f3, and f3 and f satisfy the conditional expression: 4.2< f3/f < 5.5.

8. The optical lens assembly of claim 1,

the focal length of the third lens is f3, the thickness of the third lens on the optical axis is CT3, and f3 and CT3 satisfy the conditional expression: 3.5< f3/CT3< 5.

9. The optical lens assembly of claim 1,

the thickness of the third lens element on the optical axis is CT3, the distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element on the optical axis is d34, and CT3, d34 and f satisfy the following conditional expressions: 1.5< (CT3+ d34)/f < 2.5.

10. The optical lens assembly of claim 1,

the sixth lens has a focal length f6, a thickness on an optical axis of the sixth lens is CT6, and f6 and CT6 satisfy the conditional expression: 2< f6/CT6< 3.5.

11. The optical lens assembly of claim 1,

the maximum field angle of the optical lens group is FOV, the image height corresponding to the maximum field angle of the optical lens group is Imgh, and the FOV, the f and the Imgh satisfy the conditional expression: 50 ° < (FOV x f)/Imgh <61 °.

12. The optical lens assembly of claim 1,

a combined focal length of the fourth lens element and the fifth lens element is f45, a thickness of the fourth lens element on the optical axis is CT4, a thickness of the fifth lens element on the optical axis is CT5, and f45, CT4 and CT5 satisfy the following conditional expressions: 3.5< f45/(CT4-CT5) < 10.5.

13. A lens module, comprising:

an optical lens group according to any one of claims 1 to 12;

and the light sensing surface of the light sensing element is positioned on the imaging surface of the optical lens group.

14. An electronic device, comprising:

the lens module as recited in claim 13, and a housing, the lens module being disposed within the housing.