CN113296235B

CN113296235B - Optical lens group, camera module and electronic equipment

Info

Publication number: CN113296235B
Application number: CN202110514131.1A
Authority: CN
Inventors: 邹金华; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2023-04-14
Anticipated expiration: 2041-05-11
Also published as: CN113296235A

Abstract

The application discloses an optical lens group, a camera module and an electronic device, wherein the optical lens group comprises a first lens with negative bending power, a second lens with positive bending power, a third lens with bending power, a fourth lens with bending power, a fifth lens with bending power, a sixth lens with positive bending power and a seventh lens with bending power which are sequentially arranged from an object side to an image side along an optical axis, and the optical lens group further meets the condition that the f456/f2 is less than 10.0, wherein f456 is the combined effective focal length of the fourth lens, the fifth lens and the sixth lens, f2 is the focal length of the second lens, so that the focusing power of the optical lens group on light rays can be enhanced, the rear lens group length is shortened, the optical lens group is favorably miniaturized, and the positive bending power provided by the second lens is favorably increased, the focal length of the optical lens group is increased, the optical lens group is favorably improved, and the balanced state and long-focus state of the optical lens group between miniaturization and long-focus is maintained.

Description

Optical lens group, camera module and electronic equipment

Technical Field

The application relates to the technical field of make a video recording, especially, relate to an optical lens group, module and electronic equipment make a video recording.

Background

With the development of science and technology and the popularization of smart phones and smart electronic devices, devices with diversified camera shooting functions are widely favored by people. The optical lens group is a main core component of equipment with diversified camera shooting functions, the resolving power of the optical lens group directly influences the shooting effect of the equipment, and the size of the optical lens group determines the size of the equipment. With the development of electronic devices toward miniaturization, the size of the optical lens group is required to be reduced synchronously, and the reduction of the size of the optical lens group brings about imaging problems such as insufficient light input amount and poor resolution. Therefore, how to adjust the balance between the size of the optical lens group and the imaging effects such as telephoto, etc. is an important technical problem to be solved by the related technicians.

Disclosure of Invention

The embodiment of the application provides an optical lens group, a camera module and electronic equipment, and can solve the problems.

In a first aspect, an embodiment of the present invention provides an optical lens assembly, sequentially from an object side to an image side along an optical axis, comprising:

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

a second lens having a positive refractive power;

a third lens element with refractive power, the third lens element having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a fourth lens having a bending force;

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

a sixth lens element with positive refractive power having a concave object-side surface at paraxial region and a convex image-side surface at paraxial region;

the seventh lens with the bending force, wherein the object side surface or the image side surface of the seventh lens is provided with at least one point of inflection;

the optical lens group satisfies the following conditional expression: (1) 1.0 and n 456/f2<10.0, wherein f456 is a combined effective focal length of the fourth lens, the fifth lens and the sixth lens, and f2 is a focal length of the second lens.

Based on the optical lens group of this application embodiment, through setting up face type, the tortuous power of each lens and the effective focus rational distribution of each lens, can strengthen the formation of image analytic ability of optical lens group to and be favorable to optical lens group to realize big light ring characteristic. Meanwhile, the effective focal length of the combination of the fourth lens, the fifth lens and the sixth lens is controlled to meet the condition (1), so that the focusing capacity of the optical lens group on light rays can be enhanced, the length of the rear lens group is shortened, and the miniaturization of the optical lens group is facilitated. The positive refractive power provided by the second lens element is also beneficial to increasing the focal length of the optical lens assembly, improving the telephoto capability of the optical lens assembly, realizing good imaging quality, and maintaining the balance state of the optical lens assembly between miniaturization and telephoto.

In some exemplary embodiments, the optical lens group satisfies conditional expression (2): -1.5 sj f1/f < -0.5; wherein f1 is the focal length of the first lens element, and f is the effective focal length of the optical lens assembly.

Based on the above embodiment, the first lens element provides negative refractive power to the optical lens assembly, and when the two parameters f1 and f satisfy the above conditional expression (2), the positive spherical aberration generated by the optical lens assembly can be corrected, so that the optical lens assembly obtains good on-axis image quality.

In some exemplary embodiments, the optical lens group satisfies conditional expression (3): 0.9< (f 2+ f 6)/f <2.5; wherein f2 is the focal length of the second lens element, f6 is the focal length of the sixth lens element, and f is the effective focal length of the optical lens assembly.

Based on the above embodiment, the second lens element and the sixth lens element can provide most of positive refractive power for the optical lens assembly, and by controlling the three parameters f2, f6 and f to satisfy the above conditional expression (3), the optical powers of the second lens element and the sixth lens element can be conveniently and reasonably distributed, so that the positive refractive power provided by the first lens element to the seventh lens element in the optical lens assembly can be effectively tuned, and the telephoto capability of the optical lens assembly can be improved, thereby improving the imaging quality.

In some exemplary embodiments, the optical lens group satisfies conditional expression (4): 2.3< -TT/DT 11<2.9, wherein TT is the distance on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens, and DT11 is the effective half aperture of the object side surface of the first lens.

Based on the above embodiment, by controlling the two parameters TT and DT11 to satisfy the above conditional expression (4), the light incident amount of the optical lens assembly can be effectively controlled, the diameter of the entrance pupil can be enlarged, the dark angle of the edge field can be avoided, and the size of the optical lens assembly in the direction perpendicular to the optical axis can be controlled not to be too large on the premise that the optical lens assembly satisfies the telephoto capability.

In some exemplary embodiments, the optical lens group satisfies conditional expression (5): FFL/Imgh is more than or equal to 0.3, wherein FFL is the distance from the highest point of the image side surface of the seventh lens element along the direction parallel to the optical axis to the image plane of the optical lens group along the direction parallel to the optical axis, and Imgh is half of the image height corresponding to the maximum field angle of the optical lens group.

Based on the embodiment, the FFL parameter and the h parameter are controlled to satisfy the condition (5), so that the distance between the seventh lens and the imaging surface is regulated and controlled within a proper range, the optical lens group can obtain a longer focusing range, and the requirement of the optical lens group for high pixels can be met.

In some exemplary embodiments, the optical lens group satisfies conditional expression (6): f/EPD is more than or equal to 1.7 and less than or equal to 1.9, wherein f is the effective focal length of the optical lens group, and EPD is the entrance pupil diameter of the optical lens group.

Based on the embodiment, the two parameters f and EPD are controlled to satisfy the conditional expression (6), so that the optical lens group has the characteristic of a large aperture under the same total effective focal length specification, the luminous flux of the optical lens group in unit time can be increased, the dark angle of the edge field is avoided, and the imaging effect of the optical lens group in a dark environment is enhanced.

In some exemplary embodiments, the optical lens group satisfies conditional expression (7): 0.5< -R11/R10 <5.0, where R10 is a radius of curvature of an object-side surface of the fifth lens element at a paraxial region, and R11 is a radius of curvature of an image-side surface of the fifth lens element at a paraxial region.

Based on the above embodiment, by constraining the curvature radii of the object-side surface and the image-side surface of the fifth lens element to satisfy the conditional expression (7), the deflection angles of the respective lens elements with respect to light can be effectively balanced by the fifth lens element, and astigmatism of the off-axis field can be improved, thereby improving the imaging quality of the optical lens assembly.

In some exemplary embodiments, the optical lens group satisfies conditional expression (8): 0.5< | f7|/R14<15.0, wherein f7 is a focal length of the seventh lens, and R14 is a radius of curvature of an object-side surface of the seventh lens at a paraxial region.

Based on the above embodiment, by controlling the two parameters f7 and R14 to satisfy the above conditional expression (8), the relationship between the effective focal length of the seventh lens element and the curvature radius of the object-side surface of the seventh lens element is conveniently and reasonably configured to reduce the incident angle of the light entering the photosensitive element in the image plane, thereby ensuring that the optical lens assembly can be easily matched with the photosensitive element, and improving the applicability of the optical lens assembly

In some exemplary embodiments, the optical lens group satisfies conditional expression (9): 1.5 instead of CT6/| SAG61| <4.0, wherein CT6 is the thickness of the sixth lens on the optical axis, and SAG61 is the rise of the object-side surface of the sixth lens at the maximum clear aperture.

Based on the above embodiment, specifically, SAG61 is a distance in a direction parallel to the optical axis from a maximum effective clear aperture of the object-side surface of the sixth lens element to an intersection point of the object-side surface of the sixth lens element and the optical axis, and when the SAG61 value is a positive value, the maximum effective clear aperture of the object-side surface of the sixth lens element is closer to the image side of the optical lens group than the center of the surface in the direction parallel to the optical axis of the optical lens group; when the SAG61 value is negative, the maximum effective clear aperture of the object-side surface of the sixth lens element is closer to the object side of the optical lens assembly than the center of the object-side surface in a direction parallel to the optical axis of the optical lens assembly. By controlling two parameters of CT6 and SAG61 to meet the conditional expression (9), the surface shape of the sixth lens is convenient to regulate and control so as to be beneficial to manufacturing and molding of the sixth lens and reduce the defect of poor molding; meanwhile, the sixth lens is convenient to trim the field curvature generated by the front lens group so as to balance the field curvature of the whole optical lens group and improve the imaging quality of the optical lens group.

In a second aspect, an embodiment of the present application provides a camera module, which includes a photosensitive element and an optical lens assembly as described above, wherein the photosensitive element is disposed in an image plane of the optical lens assembly to receive light of an image formed by the optical lens assembly.

The module of making a video recording based on this application embodiment makes the module of making a video recording have good formation of image analysis ability through adopting as above optical lens group to and be favorable to making the module of making a video recording obtain the shooting performance of big light ring, still can make the module of making a video recording have miniaturized structural feature simultaneously, be convenient for install the module of making a video recording in less installation space.

In a third aspect, an embodiment of the present application provides an electronic device, where the electronic device includes a fixing member and the camera module as described above, and the camera module is installed on the fixing member to obtain an image.

Based on this application embodiment's electronic equipment, through the installation as above the module of making a video recording can obtain the shooting performance of big light ring, long focal length, make electronic equipment have good formation of image quality.

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 structural view of an optical lens assembly according to an embodiment of the present application;

FIG. 2A is a spherical aberration chart of an optical lens assembly according to an embodiment of the present application; FIG. 2B is a graph showing astigmatism of an optical lens assembly according to an embodiment of the present application; FIG. 2C is a distortion curve diagram of an optical lens assembly according to an embodiment of the present invention;

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

FIG. 4A is a spherical aberration chart of an optical lens assembly according to the second embodiment of the present application; FIG. 4B is a graph showing astigmatism of the optical lens assembly according to the second embodiment of the present application; FIG. 4C is a distortion curve diagram of an optical lens assembly according to the second embodiment of the present application;

fig. 5 is a schematic structural diagram of an optical lens assembly according to a third embodiment of the present application;

FIG. 6A is a spherical aberration chart of an optical lens assembly according to a third embodiment of the present application; FIG. 6B is a graph showing astigmatism of the optical lens assembly according to the third embodiment of the present application; FIG. 6C is a distortion plot of an optical lens assembly according to a third embodiment of the present application;

fig. 7 is a schematic structural diagram of an optical lens assembly according to a fourth embodiment of the present application;

FIG. 8A is a spherical aberration chart of an optical lens assembly according to the fourth embodiment of the present disclosure; FIG. 8B is a graph showing astigmatism curves of the optical lens assembly according to the fourth embodiment of the present application; FIG. 8C is a distortion curve diagram of an optical lens assembly according to the fourth embodiment of the present application;

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

FIG. 10A is a spherical aberration chart of an optical lens assembly according to the fifth embodiment of the present application; FIG. 10B is a graph showing astigmatism curves of an optical lens assembly according to the fifth embodiment of the present application; FIG. 10C is a distortion plot of an optical lens assembly according to the fifth embodiment of the present application;

fig. 11 is a schematic structural diagram of an optical lens assembly according to a sixth embodiment of the present application;

FIG. 12A is a spherical aberration chart of an optical lens assembly according to the sixth embodiment of the present application; fig. 12B is a graph of astigmatism of an optical lens assembly according to a sixth embodiment of the present application; FIG. 12C is a distortion curve diagram of an optical lens assembly according to the sixth embodiment of the present application;

fig. 13 is a cross-sectional view of a camera module provided in an embodiment of the present application;

fig. 14 is a front view of an electronic device provided in an embodiment of the present application.

Detailed Description

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

Referring to fig. 1, fig. 3, fig. 5, fig. 7, fig. 9 and fig. 11, which are schematic structural diagrams of an optical lens assembly 100 according to an embodiment of the present invention, the optical lens assembly 100 includes, in order from an object side to an image side along an optical axis H, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6 and a seventh lens element L7 that have refractive power with respect to light. When the optical lens assembly 100 is used for imaging, light from an object side passes through the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 in sequence and is then projected onto an image plane IMG. The imaging surface IMG can be used for setting a photosensitive element, light rays passing through the seventh lens L7 can be received by the photosensitive element in the imaging surface IMG and converted into image signals, and the photosensitive element transmits the image signals to other systems at the rear end for image analysis and other processing.

The first lens element L1 has negative refractive power, which is beneficial to enabling large-angle light to enter the optical lens assembly 100, and to converge to the imaging plane IMG of the optical lens assembly 100 after being refracted by other lens elements in the optical lens assembly 100, thereby improving the imaging quality; the image side surface of the first lens L1 is a concave surface, which is beneficial to correcting aberration and further improving imaging quality. The object-side surface of the first lens element L1 can be concave, convex or planar at a position near the optical axis H.

The second lens element L2 has positive refractive power, wherein an object-side surface of the second lens element L2 at a paraxial region H thereof can be concave, convex, or flat, and an image-side surface of the second lens element L2 at a paraxial region H thereof can be concave, convex, or flat, so that a surface shape of the second lens element L2 and a surface shape of the first lens element L1 can be flexibly configured to coordinate a light propagation angle.

The third lens element L3 can have positive or negative refractive power, and the object-side surface of the third lens element L3 is convex at the paraxial region H and the image-side surface thereof is concave at the paraxial region H, which is beneficial for correcting the spherical aberration of the peripheral field of view and improving the relative brightness of the peripheral field of view.

The fourth lens element L4 can have a positive refractive power or a negative refractive power, wherein an object-side surface of the fourth lens element L4 can be concave, convex or flat at a paraxial region H, and an image-side surface of the fourth lens element L4 can be concave, convex or flat at a paraxial region H. The fourth lens L4 surface type and the front end lens surface type can be combined to further coordinate the light propagation angle, so as to improve the imaging resolution capability of the optical lens group 100.

The fifth lens element L5 has positive refractive power or negative refractive power, and the object-side surface of the fifth lens element L5 is concave at the paraxial region H and the image-side surface thereof is convex at the paraxial region H, so as to effectively correct astigmatic aberration and make the image formation of the optical lens assembly clearer.

The sixth lens element L6 has positive refractive power, and the object-side surface of the sixth lens element L6 is concave at the paraxial region H and the image-side surface thereof is convex at the paraxial region H, so as to effectively suppress the off-axis coma aberration and increase of astigmatism.

The seventh lens element L7 may have positive refractive power or negative refractive power, wherein an object-side surface of the second lens element L2 at a paraxial region H thereof may be concave, convex, or planar, an image-side surface of the seventh lens element L7 at a paraxial region H thereof may be concave, convex, or planar, and the object-side surface or the image-side surface of the seventh lens element L7 has at least one inflection point, which is favorable for correcting distortion and curvature of field generated by the front lens element, so that the arrangement of the refractive power of the IMG lens element near the image plane is more uniform, and the sensitivity of the optical lens assembly is reduced.

The optical lens assembly 100 further satisfies the conditional expression (1): 1.0< -f 456/f2<10.0, where f456 is a combined effective focal length of the fourth lens L4, the fifth lens L5, and the sixth lens L6, f2 is a focal length of the second lens L2, and f456/f2 may be 1.5, 3.0, 4.5, 6.0, 7.5, or 9.0. By controlling the effective focal length of the combination of the fourth lens element, the fifth lens element and the sixth lens element to satisfy the above conditional expression (1), the focusing power of the optical lens assembly 100 on light can be enhanced, the length of the rear lens assembly can be shortened, and the miniaturization of the optical lens assembly 100 is facilitated. The positive refractive power provided by the second lens element L2 is also beneficial to increase the focal length of the optical lens assembly 100, thereby improving the telephoto capability of the optical lens assembly 100, achieving good imaging quality, and maintaining the balance state of the optical lens assembly 100 between miniaturization and telephoto. When f456/f2 is greater than or equal to 10, the equivalent positive refractive power of the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 is weaker, which results in insufficient aberration correction capability of the second lens element L2, and the optical lens assembly 100 is prone to generate high-order aberration, which affects the imaging quality of the optical lens assembly 100. When f456/f2 is less than or equal to 1.0, the equivalent positive refractive power of the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 is too strong, and the negative spherical aberration of the optical lens assembly 100 is difficult to correct, resulting in insufficient telephoto capability of the optical lens assembly 100.

In the optical lens assembly 100 in the embodiment of the present application, by setting the surface shape and the bending force of each lens element and reasonably distributing the effective focal length of each lens element, the imaging resolution capability of the optical lens assembly 100 can be enhanced, and the optical lens assembly 100 is favorable for realizing a large aperture characteristic.

In some exemplary embodiments, the object-side surface and/or the image-side surface of the first lens element L1 to the seventh lens element L7 may be aspheric or spherical, and the aspheric design enables the object-side surface and/or the image-side surface of the lens elements to have a more flexible design, so that the lens elements can solve the problems of poor imaging performance, distorted field of view, narrow field of view, etc. in a smaller and thinner lens, and the lens assembly can have good imaging quality without providing too many lens elements, and is helpful to shorten the length of the optical lens assembly 100. The spherical lens has simple manufacturing process and low production cost, is convenient for flexibly designing the surface type of each lens, and improves the imaging resolving power of each lens. The spherical surface and the aspheric surface are matched to effectively eliminate the aberration of the system, so that the optical lens assembly 100 has good imaging quality, and the flexibility of design and assembly of each lens in the optical lens assembly is improved. The surfaces of the lenses in the optical lens assembly 100 may also be any combination of spherical surfaces and aspherical surfaces, and are not necessarily all spherical surfaces or all aspherical surfaces.

The material of each lens element in the optical lens assembly 100 may be plastic, glass, or a combination of glass and plastic. The plastic lens can reduce the weight of the optical lens assembly 100 and reduce the manufacturing cost, and the glass lens can endure a high temperature and has an excellent optical effect. Specifically, the first lens element L1 to the seventh lens element L7 may be made of plastic, which facilitates processing of the respective lens elements. Certainly, the configuration relationship of the lens materials in the optical lens assembly 100 is not limited to the above embodiments, and any one of the lenses may be made of plastic or glass, and the specific configuration relationship is determined according to actual design requirements and is not described herein again.

In some exemplary embodiments, the optical lens group 100 further satisfies the conditional expression (2): -1.5 sj f1/f < -0.5; wherein f1 is a focal length of the first lens element L1, f is an effective focal length of the optical lens assembly 100, and f1/f can be-1.3, -1.1, -0.9, -0.7, or-0.6. The first lens element L1 provides a part of the optical lens assembly 100 with negative refractive power, and when the two parameters f1 and f satisfy the above conditional expression (2), the positive spherical aberration generated by the optical lens assembly 100 can be corrected, so that the optical lens assembly 100 obtains good on-axis imaging quality. When f1/f is larger than or equal to-0.5, the negative bending force of the first lens element L1 is too strong to suppress the edge aberration, and when f1/f is smaller than or equal to-1.5, the negative bending force of the first lens element L1 is weaker to correct the spherical aberration of the optical lens assembly 100 and affect the imaging quality of the optical lens assembly 100.

In some exemplary embodiments, the optical lens group 100 further satisfies the conditional expression (3): 0.9< (f 2+ f 6)/f <2.5; where f2 is the focal length of the second lens L2, f6 is the focal length of the sixth lens L6, and (f 2+ f 6)/f may be 1.0, 1.3, 1.6, 1.9, 2.1, 2.3, or 2.4. The second lens element L2 and the sixth lens element L6 can provide most of the positive refractive power for the optical lens assembly 100, and the three parameters f2, f6 and f are controlled to satisfy the above conditional expression (3), so as to reasonably distribute the refractive powers of the second lens element L2 and the sixth lens element L6, so as to effectively tune the positive refractive power provided by the first lens element L1 to the seventh lens element L7 in the optical lens assembly 100, and simultaneously improve the telephoto capability of the optical lens assembly 100, thereby improving the imaging quality. When (f 2+ f 6)/f exceeds the upper limit of 2.5 of the conditional expression (3) or falls below the lower limit of 0.9 of the conditional expression (3), it is difficult to well balance the positive refractive power of the optical lens group 100 by the second lens L2 and the sixth lens L6, which affects the image quality.

In some exemplary embodiments, the optical lens group 100 further satisfies the conditional expression (4): 2.3< -TT/DT 11<2.9, wherein TT is a distance on the optical axis H from the object-side surface of the first lens L1 to the image-side surface of the seventh lens L7, DT11 is an effective half aperture of the object-side surface of the first lens L1, and TT/DT11 may be 2.4, 2.5, 2.6, 2.7 or 2.8. By controlling the two parameters TT and DT11 to satisfy the above conditional expression (4), the light-entering amount of the optical lens assembly 100 can be effectively controlled, the diameter of the entrance pupil can be enlarged, the dark angle of the edge field can be avoided, and the size of the optical lens assembly 100 in the direction perpendicular to the optical axis H can be controlled not to be too large on the premise that the optical lens assembly 100 satisfies the telephoto capability. When TT/DT11 is larger than or equal to 2.9, DT11 is difficult to effectively match TT, and the light incident quantity of the optical lens group 100 is insufficient, so that dark corners appear in the edge view field possibly; when TT/DT11 is less than or equal to 2.3, the effective half aperture size of the object-side surface of the first lens element L1 is too large, resulting in an oversized optical lens assembly 100.

In some exemplary embodiments, the optical lens group 100 further satisfies the conditional expression (5): FFL/Imgh is greater than or equal to 0.3, where FFL is a distance from a highest point of the image-side surface of the seventh lens element L7 along a direction parallel to the optical axis H to the image plane IMG of the optical lens assembly 100 along the direction parallel to the optical axis H, and H is a half of the image height corresponding to the maximum field angle of the optical lens assembly 100. By controlling two parameters of FFL and h to satisfy the above conditional expression (5), the distance between the seventh lens element L7 and the imaging plane IMG is controlled to be within a suitable range, so that the optical lens assembly 100 obtains a longer focusing range, and the requirement of the optical lens assembly 100 for high pixels is satisfied. When FFL/Imgh is smaller than 0.3, the distance from the seventh lens L7 to the imaging surface IMG is too close, and the position of the seventh lens L7 is not convenient to regulate so as to meet the focusing requirement. Preferably, FFL/Imgh is 0.5 or more.

In some exemplary embodiments, the optical lens group 100 further satisfies conditional expression (6): f/EPD is more than or equal to 1.7 and less than or equal to 1.9, wherein EPD is the entrance pupil diameter of the optical lens group 100, and f/EPD can be 1.7, 1.75, 1.78, 1.80 or 1.85. By controlling the two parameters f and EPD to satisfy the conditional expression (6), the optical lens group 100 can have the characteristic of a large aperture under the same total effective focal length specification, so that the luminous flux of the optical lens group 100 in unit time can be increased, the dark angle of the edge field can be avoided, and the imaging effect of the optical lens group 100 in a dark environment can be enhanced. When f/EPD is greater than 1.9, the entrance pupil diameter of the optical lens group 100 is too small, resulting in difficulty in obtaining sufficient luminous flux by the optical lens group 100; when f/EPD is smaller than 1.7, the entrance pupil diameter is too large, resulting in an oversized head of the optical lens assembly 100.

In some exemplary embodiments, the optical lens group 100 further satisfies the conditional expression (7): 0.5 sR11/R10 <5.0, where R10 is a radius of curvature of the object-side surface of the fifth lens L5 at the paraxial region H, R11 is a radius of curvature of the image-side surface of the fifth lens L5 at the paraxial region H, and R11/R10 may be 1.0, 1.5, 2.0, 2.5, 3.5, 4.0, or 4.5. By constraining the curvature radii of the object-side surface of the fifth lens element L5 and the image-side surface of the fifth lens element L5 to satisfy the above conditional expression (7), the deflection angles of the respective lens elements with respect to light can be effectively balanced by the fifth lens element L5, and simultaneously the astigmatism of the off-axis field of view can be improved, thereby improving the imaging quality of the optical lens assembly 100. When R10/R11 is less than or equal to 0.5, the L5 surface of the fifth lens is excessively bent, the molding is poor, and the manufacturing yield is influenced; when the ratio R10/R11 is greater than or equal to 5.0, the surface shape of the fifth lens element L5 is too smooth, which makes aberration correction difficult, and astigmatism of the external field is too large, thereby affecting the imaging quality of the optical lens assembly 100.

In some exemplary embodiments, the optical lens group 100 further satisfies the conditional expression (8): 0.5< | f7|/R14<15.0, where f7 is the focal length of the seventh lens L7, R14 is the radius of curvature of the object-side surface of the seventh lens L7 at the paraxial region H, | f7|/R14 can be 1.0, 3.0, 5.0, 7.0, 9.0, 11.0, or 13.0. By controlling the two parameters f7 and R14 to satisfy the conditional expression (8), the relationship between the effective focal length of the seventh lens element L7 and the curvature radius of the object-side surface of the seventh lens element L7 is conveniently and reasonably configured to reduce the incident angle of the light entering the photosensitive element in the imaging plane IMG, thereby ensuring that the optical lens assembly 100 can be easily matched with the photosensitive element, and improving the applicability of the optical lens assembly 100.

In some exemplary embodiments, the optical lens group 100 further satisfies the conditional expression (9): 1.5 instead of CT6/| SAG61| <4.0, wherein CT6 is the thickness of the sixth lens L6 on the optical axis H, SAG61 is the rise of the sixth lens L6 object-side surface S11 at the maximum clear aperture, in particular SAG61 is the distance in the direction parallel to the optical axis H from the maximum effective clear aperture of the sixth lens L6 object-side surface S11 to the intersection of the sixth lens L6 object-side surface S11 with the optical axis H, and when the value of SAG61 is positive, the maximum effective clear aperture of the sixth lens L6 object-side surface S11 is closer to the image side of the optical lens assembly 100 than at the center of the surface in the direction parallel to the optical axis H of the optical lens assembly 100; when the SAG61 value is negative, the maximum effective clear aperture of the object-side surface S11 of the sixth lens element L6 is closer to the object side of the optical lens assembly 100 than the center of the surface in a direction parallel to the optical axis H of the optical lens assembly 100. CT6/| SAG61| may be 1.8, 2.5, 3.0, 3.5 or 3.8. By controlling two parameters of CT6 and SAG61 to meet the conditional expression (9), the surface shape of the sixth lens L6 is convenient to regulate and control so as to be beneficial to manufacturing and molding of the sixth lens L6 and reduce the defect of poor molding; meanwhile, the sixth lens element L6 is used to trim the curvature of field generated by the front lens element, so as to balance the curvature of field of the entire optical lens assembly 100 and improve the imaging quality of the optical lens assembly 100. When CT6/| SAG61| is less than or equal to 1.5, the sixth lens L6 is too bent, which is inconvenient for processing and molding the sixth lens L6 and makes the sixth lens L6 too sensitive; when CT6/| SAG61| is greater than or equal to 4.0, the sixth lens L6 is too thick, which increases the overall size of the optical lens assembly 100 and is not convenient for balancing the field curvature.

The optical lens assembly 100 further includes a stop ST, the center of the stop ST is located on the optical axis H of the optical lens assembly 100, and the stop ST can be disposed between any two lenses or disposed on the object side of the first lens L1, and is mounted on a lens barrel of the lens, for example. In other embodiments, the stop ST may be provided as a light-blocking layer applied on the object side or image side of the lens, and leaving a light-transmitting area to allow light to pass through. Specifically, in some exemplary embodiments, the stop ST may be disposed at an image side surface of the second lens L2.

The optical lens assembly 100 further includes a filter L8, and the filter L8 is disposed between the image-side surface of the seventh lens element L7 and the image plane IMG. The optical filter L8 is an infrared cut-off optical filter L8 for filtering out infrared light, and prevents the infrared light from reaching the imaging plane IMG of the optical lens assembly 100, thereby preventing the infrared light from interfering with normal imaging. The filter L8 may be assembled with each lens as part of the optical lens assembly 100. For example, in some embodiments, each lens in the optical lens group 100 is mounted in a lens barrel, and the filter L8 is mounted at an image end of the lens barrel. In other embodiments, the optical filter L8 does not belong to the optical lens assembly 100, and the optical filter L8 can be installed between the optical lens assembly 100 and the photosensitive device when the optical lens assembly 100 and the photosensitive device are assembled into a camera module. In some embodiments, the filter L8 may also be disposed on the object side of the first lens L1. In addition, in some embodiments, the optical filter L8 may not be provided, and an infrared filter may be provided on an object-side surface or an image-side surface of at least one of the first lens L1 to the seventh lens L7 to filter infrared light.

The optical lens group 100 of the above embodiment of the present application can adopt a plurality of lenses, and by reasonably distributing the focal length, the refractive power, the surface shape, the thickness of each lens, the on-axis distance between each lens, and the like, it can be ensured that the optical lens group 100 obtains a large aperture and a telephoto shooting performance, thereby better meeting the application requirements of light-weight electronic devices such as a lens, a mobile phone, and a flat panel of a vehicle-mounted auxiliary system.

The assembly structure and the corresponding implementation result of the optical lens assembly 100 according to the present invention in each embodiment will be described with reference to the drawings and tables.

The notations shown in the respective embodiments have the meanings as follows.

S1, S3, S5, S7, S9, S11, S13, and S15 are numbers of object side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter L8, respectively, and S2, S4, S6, S8, S10, S12, S14, and S16 are numbers of image side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter L8, respectively.

"k" represents a Conic Constant (Conic Constant), "A4", "A6", "A8",\8230 \8230; "A20" represents 4 th order, 6 th order, 8 th order, \8230;, 20 th order aspheric coefficients, respectively.

In each table showing the conic constant and the aspherical coefficient, the numerical value is expressed by an exponent with a base 10. For example, "0.12E-05" means "0.12X (minus 5 th power of 10)", "9.87E +03" means "9.87X (3 rd power of 10)".

In the optical lens group 100 used in each embodiment, specifically, when the distance in the direction perpendicular to the optical axis H is "R", the paraxial curvature at the lens origin is "c" (paraxial curvature c is the inverse of the upper lens curvature radius R, i.e., c = 1/R), the conic constant is "k", and the aspherical coefficients of 4 th order, 6 th order, 8 th order, \\8230 \8230; "i < th > order are" A4"," A6"," A8", \8230;" 8230; "Ai", respectively, the aspherical shape x is defined by the following equation 1.

Mathematical formula 1:

example one

Referring to fig. 1, a schematic view of the optical lens assembly 100 in this embodiment is shown, the optical lens assembly 100 includes a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7 and a light filter L8, which are sequentially disposed from an object side to an image side along an optical axis H, a stop ST is disposed on an image side surface of the second lens element L2, and an image plane IMG of the optical lens assembly 100 is located on a side of the light filter L8 away from the seventh lens element L7. The first lens L1 to the seventh lens L7 are all plastic aspheric lenses, and the filter L8 is an infrared cut filter L8 made of glass.

The first lens element L1 with negative refractive power has a convex object-side surface S1 at a paraxial region H, a concave image-side surface S2 at a paraxial region H, a convex object-side surface S1 at a circumference of the first lens element L1, and a concave image-side surface S2 at a circumference of the first lens element L1.

The second lens element L2 with positive and negative refractive powers has a convex object-side surface S3 at a paraxial region H, a concave image-side surface S4 at a paraxial region H, and both object-side surfaces S3 and image-side surfaces S4 of the second lens element L2 are convex circumferentially.

The third lens element L3 with negative refractive power has a convex object-side surface S5 at a paraxial region H, a concave image-side surface S6 at a paraxial region H, a convex object-side surface S5 at a circumference of the third lens element L3, and a concave image-side surface S6 at a circumference thereof.

The fourth lens element L4 with positive refractive power has a convex object-side surface S7 and a convex image-side surface S8 at a paraxial region H of the fourth lens element L4, wherein the object-side surface S7 of the fourth lens element L4 is concave at a circumference and the image-side surface S8 is convex at a circumference.

The fifth lens element L5 with negative refractive power has a concave object-side surface S9 at a paraxial region H and a convex image-side surface S10 at a paraxial region H of the fifth lens element L5, and the fifth lens element L5 has a concave object-side surface S9 at a circumference and a convex image-side surface S10 at a circumference.

The sixth lens element L6 with positive refractive power has a concave object-side surface S11 at a paraxial region H and a convex image-side surface S12 at a paraxial region H of the sixth lens element L6, and the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are both concave on a circumference.

The seventh lens element L7 with negative refractive power has a convex object-side surface S13 at a paraxial region H and a concave image-side surface S14 at a paraxial region H of the seventh lens element L7, and the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are circumferentially concave and convex, respectively.

In the first embodiment, the refractive index, abbe number and focal length of the optical lens assembly 100 are all referenced to the light with a wavelength of 587.56nm, and the relevant parameters of the optical lens assembly 100 are shown in table 1. Wherein f is the effective focal length of the optical lens assembly 100, TTL is the total optical length of the optical lens assembly 100, FNO is the aperture value, FOV is the maximum field angle of the optical lens assembly 100, and the units of curvature radius, thickness and focal length are all millimeters.

TABLE 1

The calculation results of the numerical relationships between the parameters of the optical lens assembly 100 according to the present embodiment are shown in table 2.

TABLE 2

Conditional formula (VII)	Numerical value	Conditional formula (II)	Numerical value
				f456/f2	1.197	f/EPD	1.775
f1/f	-1.024	R11/R10	4.19
				(f2+f6)/f	1.07	\|f7\|/R14	0.71
TT/DT11	2.7	CT6/\|SAG61\|	3.529
				FFL/Imgh	0.333

As can be seen from the results in table 2, the calculation results of the numerical relationships between the lens parameters of the optical lens assembly 100 in this embodiment satisfy the conditional expressions (1) to (9) in a one-to-one correspondence.

The conic constant K and aspheric coefficients corresponding to the surfaces of the lenses in the first example are shown in table 3.

TABLE 3

/>

Fig. 2A, fig. 2B and fig. 2C are a spherical aberration graph, an astigmatism graph and a distortion graph, respectively, in the first embodiment.

The abscissa of the spherical aberration graph represents the focus offset, and the ordinate represents the normalized field of view, and the focus offsets of different fields of view are within ± 0.05 mm when the wavelengths given in fig. 2A are 656.2725nm, 587.5618nm, and 486.1327nm, respectively, which illustrates that the optical lens assembly 100 in this embodiment has a small spherical aberration and a good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate of the astigmatism graph represents the image height, and the astigmatism curve given in fig. 2B represents that the focus offsets of the sagittal image surface and the meridional image surface are within ± 0.05 mm when the wavelength is 587.5618nm, which indicates that the astigmatism of the optical lens group 100 in this embodiment is small and the imaging quality is good.

The abscissa of the distortion curve represents the distortion rate, the ordinate represents the image height, and the distortion curve given in fig. 2C represents that the distortion is within ± 4% at a wavelength of 587.5618nm, which shows that the distortion of the optical lens assembly 100 in this embodiment is better corrected and the imaging quality is better.

As can be seen from fig. 2A, 2B and 2C, the optical lens assembly 100 according to the first embodiment can achieve a good imaging effect.

Example two

Referring to fig. 3, the optical lens assembly 100 of the present embodiment includes a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7 and a light filter L8 sequentially disposed from an object side to an image side along an optical axis H, a stop ST is disposed on an image-side surface of the second lens element L2, and an image plane IMG of the optical lens assembly 100 is located on a side of the light filter L8 away from the seventh lens element L7. The first lens L1 to the seventh lens L7 are all plastic aspheric lenses, and the filter L8 is an infrared cut filter L8 made of glass.

The first lens element L1 with negative refractive power has a concave object-side surface S1 and a concave image-side surface S2 at a paraxial region H of the first lens element L1, wherein the object-side surface S1 of the first lens element L1 is circumferentially convex and the image-side surface S2 is circumferentially concave.

The second lens element L2 with positive and negative refractive powers has a convex object-side surface S3 at a paraxial region H and a concave image-side surface S4 at a paraxial region H of the second lens element L2, and has a concave object-side surface S3 and a convex image-side surface S4 at a circumference of the second lens element L2.

The third lens element L3 with positive refractive power has a convex object-side surface S5 at a paraxial region H and a concave image-side surface S6 at a paraxial region H of the third lens element L3, and has a convex object-side surface S5 and a concave image-side surface S6 at a circumference of the third lens element L3.

The fourth lens element L4 with positive refractive power has a concave object-side surface S7 at a paraxial region H and a convex image-side surface S8 at a paraxial region H of the fourth lens element L4, wherein the object-side surface S7 of the fourth lens element L4 is circumferentially concave and the image-side surface S8 is circumferentially convex.

The fifth lens element L5 with negative refractive power has a concave object-side surface S9 at a paraxial region H and a convex image-side surface S10 at a paraxial region H, and the object-side surface S9 of the fifth lens element L5 is circumferentially concave and the image-side surface S10 is circumferentially convex.

The seventh lens element L7 with negative refractive power has a convex object-side surface S13 at a paraxial region H and a concave image-side surface S14 at a paraxial region H, and the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are concave at a circumference and convex at a circumference.

In the second embodiment, the refractive index, abbe number and focal length of the optical lens assembly 100 are all referenced to the light with a wavelength of 587.56nm, and the relevant parameters of the optical lens assembly 100 are shown in table 4. Wherein f is the effective focal length of the optical lens assembly 100, TTL is the total optical length of the optical lens assembly 100, FNO is the aperture value, FOV is the maximum field angle of the optical lens assembly 100, and the units of curvature radius, thickness and focal length are all millimeters.

TABLE 4

The calculation results of the numerical relationship between the parameters of the optical lens assembly 100 according to the present embodiment are shown in table 5.

TABLE 5

Conditional formula (VII)	Numerical value	Conditional formula (II)	Numerical value
				f456/f2	1.258	f/EPD	1.8
f1/f	-1.415	R11/R10	3.78
				(f2+f6)/f	1.74	\|f7\|/R14	4.86
TT/DT11	2.68	CT6/\|SAG61\|	2.825
				FFL/Imgh	0.346

As can be seen from the results in table 5, the calculation results of the numerical relationships between the lens parameters of the optical lens assembly 100 in this embodiment satisfy the conditional expressions (1) to (9) in a one-to-one correspondence.

The conic constant K and aspheric coefficients corresponding to the surface of each lens in example two are shown in table 6.

TABLE 6

Noodle sequence number

S1

S2

S3

S4

S5

S6

S7

K

-9.900E+01

-2.976E+01

-5.823E+00

-9.900E+01

-1.012E+01

-8.198E+00

-9.900E+01

A4

9.714E-03

-3.719E-02

2.588E-02

5.554E-02

-1.984E-02

-1.154E-02

-2.445E-02

A6

-1.673E-02

1.729E-02

5.085E-04

-1.329E-01

1.524E-03

-1.109E-02

-8.349E-03

A8

1.203E-02

-9.792E-03

-5.505E-03

2.426E-01

-1.272E-02

2.786E-02

1.297E-02

A10

-5.772E-03

4.837E-03

3.955E-03

-3.121E-01

3.280E-02

-4.390E-02

-2.296E-02

A12

1.897E-03

-1.475E-03

-1.479E-03

2.632E-01

-4.075E-02

4.998E-02

2.480E-02

A14

-4.054E-04

2.562E-04

3.488E-04

-1.431E-01

2.895E-02

-3.745E-02

-1.785E-02

A16

5.383E-05

-1.830E-05

-5.716E-05

4.837E-02

-1.170E-02

1.724E-02

7.688E-03

A18

-4.058E-06

-7.827E-07

1.012E-05

-9.233E-03

2.507E-03

-4.382E-03

-1.785E-03

A20

1.332E-07

1.393E-07

-1.487E-06

7.588E-04

-2.219E-04

4.680E-04

1.706E-04

Number of noodles

S8

S9

S10

S11

S12

S13

S14

K

-5.630E+01

-1.702E+01

7.288E+00

-1.780E+01

-3.174E+00

-3.110E+00

-4.289E+00

A4

-5.616E-02

-1.203E-01

-6.010E-02

-3.519E-02

-2.793E-02

-1.547E-02

-4.806E-03

A6

-1.798E-03

3.192E-02

1.319E-02

1.243E-02

1.242E-02

3.219E-03

-3.784E-05

A8

3.727E-02

5.991E-03

6.105E-03

1.046E-02

-1.773E-03

-1.140E-03

1.544E-05

A10

-6.596E-02

-2.805E-02

-5.570E-03

-1.048E-02

-5.617E-04

3.344E-04

4.853E-06

A12

6.382E-02

3.356E-02

1.726E-03

4.134E-03

4.398E-04

-6.383E-05

-1.476E-06

A14

-3.690E-02

-2.157E-02

-2.633E-04

-9.007E-04

-1.169E-04

7.762E-06

1.731E-07

A16

1.254E-02

7.798E-03

2.083E-05

1.136E-04

1.569E-05

-5.826E-07

-1.092E-08

A18

-2.287E-03

-1.477E-03

-9.190E-07

-7.798E-06

-1.072E-06

2.460E-08

3.645E-10

A20

1.725E-04

1.135E-04

2.894E-08

2.264E-07

2.976E-08

-4.472E-10

-5.083E-12

Fig. 4A, 4B and 4C are a spherical aberration graph, an astigmatism graph and a distortion graph, respectively, in the second embodiment.

The abscissa of the spherical aberration curve represents the focus offset, and the ordinate represents the normalized field of view, and when the wavelengths given in fig. 4A are 656.2725nm, 587.5618nm, and 486.1327nm, respectively, the focus offsets of different fields of view are all within ± 0.1 mm, which indicates that the optical lens assembly 100 in this embodiment has a small spherical aberration and a good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the image height, and the astigmatism curve given in fig. 4B represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.05 mm when the wavelength is 587.5618nm, which indicates that the optical lens assembly 100 in this embodiment has small astigmatism and good imaging quality.

The abscissa of the distortion curve represents the distortion rate, the ordinate represents the image height, and the distortion curve given in fig. 4C represents that the distortion is within ± 4% when the wavelength is 587.5618nm, which shows that the distortion of the optical lens group 100 in this embodiment is better corrected and the imaging quality is better.

As can be seen from fig. 4A, 4B and 4C, the optical lens assembly 100 according to the second embodiment can achieve a good imaging effect.

EXAMPLE III

Referring to fig. 5, the optical lens assembly 100 in the present embodiment includes a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7 and a light filter L8 sequentially disposed from an object side to an image side along an optical axis H, a stop ST is disposed on an image-side surface of the second lens element L2, and an image plane IMG of the optical lens assembly 100 is located on a side of the light filter L8 away from the seventh lens element L7. The first lens L1 to the seventh lens L7 are all plastic aspheric lenses, and the filter L8 is an infrared cut filter L8 made of glass.

The first lens element L1 with negative refractive power has a convex object-side surface S1 at a paraxial region H and a concave image-side surface S2 at a paraxial region H, and the first lens element L1 has a convex object-side surface S1 and a concave image-side surface S2 at a circumference.

The second lens element L2 with positive and negative refractive powers has a convex object-side surface S3 at a paraxial region H and a concave image-side surface S4 at a paraxial region H of the second lens element L2, and both the object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex on a circumference.

The third lens element L3 with negative refractive power has a convex object-side surface S5 at a paraxial region H and a concave image-side surface S6 at a paraxial region H of the third lens element L3, and has a convex object-side surface S5 and a concave image-side surface S6 at a circumference of the third lens element L3.

The fourth lens element L4 with positive refractive power has a convex object-side surface S7 and a convex image-side surface S8 at a paraxial region H of the fourth lens element L4, wherein the object-side surface S7 of the fourth lens element L4 is circumferentially concave and the image-side surface S8 is circumferentially convex.

In the third embodiment, the refractive index, abbe number and focal length of the optical lens assembly 100 are all referenced to the light with the wavelength of 587.56nm, and the relevant parameters of the optical lens assembly 100 are shown in table 7. Wherein f is an effective focal length of the optical lens assembly 100, TTL is an optical total length of the optical lens assembly 100, FNO is an aperture value, FOV is a maximum field angle of the optical lens assembly 100, and the units of the curvature radius, the thickness and the focal length are millimeters.

TABLE 7

The calculation results of the numerical relationships between the parameters of the optical lens assembly 100 according to the present embodiment are shown in table 8.

TABLE 8

Conditional formula (II)	Numerical value	Conditional formula (II)	Numerical value
				f456/f2	2.41	f/EPD	1.75
f1/f	-0.997	R11/R10	13.00
				(f2+f6)/f	1.4	\|f7\|/R14	6.63
TT/DT11	2.51	CT6/\|SAG61\|	2.709
				FFL/Imgh	0.419

As can be seen from the results in table 8, the calculation results of the numerical relationships between the lens parameters of the optical lens assembly 100 in the present embodiment satisfy the conditional expressions (1) to (9) in a one-to-one correspondence manner.

The conic constant K and aspheric coefficients corresponding to the surface of each lens in example three are shown in table 9.

TABLE 9

Number of noodles

S1

S2

S3

S4

S5

S6

S7

K

-8.800E+01

-2.967E+01

-6.411E+00

-7.052E+01

-9.532E+00

-6.667E+00

6.000E+00

A4

6.617E-03

-3.079E-02

2.535E-02

5.413E-02

1.642E-02

1.673E-02

-2.427E-02

A6

-1.580E-02

-6.667E-03

-2.579E-03

-6.242E-02

-5.762E-02

-5.990E-02

-1.378E-03

A8

1.160E-02

1.784E-02

-8.964E-03

6.180E-02

5.987E-02

8.540E-02

-1.364E-02

A10

-5.133E-03

-1.169E-02

1.325E-02

-5.943E-02

-5.476E-02

-9.912E-02

2.251E-02

A12

1.526E-03

4.502E-03

-9.150E-03

4.143E-02

3.989E-02

8.399E-02

-2.420E-02

A14

-2.965E-04

-1.087E-03

3.685E-03

-1.854E-02

-1.902E-02

-4.616E-02

1.591E-02

A16

3.581E-05

1.613E-04

-8.824E-04

5.040E-03

5.452E-03

1.551E-02

-6.235E-03

A18

-2.432E-06

-1.341E-05

1.169E-04

-7.588E-04

-8.491E-04

-2.908E-03

1.318E-03

A20

7.061E-08

4.763E-07

-6.663E-06

4.846E-05

5.490E-05

2.344E-04

-1.127E-04

Number of noodles

S8

S9

S10

S11

S12

S13

S14

K

-7.658E+01

-1.903E+01

6.000E+00

-2.535E+01

-4.103E+00

-7.106E+00

-4.303E+00

A4

-5.232E-02

-1.338E-01

-7.955E-02

-2.124E-02

-2.996E-02

-3.101E-02

-2.015E-02

A6

9.780E-03

6.211E-02

3.936E-02

6.233E-03

1.723E-02

8.324E-03

2.974E-03

A8

-7.530E-03

-1.448E-02

-6.542E-03

1.152E-02

-5.131E-03

-2.814E-03

-3.230E-04

A10

4.030E-03

-1.004E-02

-3.619E-03

-1.347E-02

4.025E-04

8.525E-04

8.316E-06

A12

-2.404E-03

1.494E-02

1.974E-03

6.466E-03

4.697E-04

-1.868E-04

3.243E-06

A14

1.642E-03

-8.848E-03

-3.412E-04

-1.662E-03

-1.924E-04

2.714E-05

-5.783E-07

A16

-7.564E-04

2.838E-03

1.429E-05

2.387E-04

3.185E-05

-2.467E-06

4.766E-08

A18

1.801E-04

-4.774E-04

1.801E-06

-1.807E-05

-2.491E-06

1.262E-07

-2.071E-09

A20

-1.646E-05

3.297E-05

-1.273E-07

5.607E-07

7.578E-08

-2.755E-09

3.832E-11

Fig. 6A, 6B and 6C are a spherical aberration graph, an astigmatism graph and a distortion graph, respectively, in the third embodiment.

The abscissa of the spherical aberration graph represents the focus offset, and the ordinate represents the normalized field of view, and the focus offsets of different fields of view are all within ± 0.5 mm when the wavelengths given in fig. 6A are 656.2725nm, 587.5618nm, and 486.1327nm, respectively, which illustrates that the optical lens assembly 100 in this embodiment has a small spherical aberration and a good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the image height, and the astigmatism curve given in fig. 6B represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.05 mm when the wavelength is 587.5618nm, which indicates that the optical lens assembly 100 in this embodiment has small astigmatism and good imaging quality.

The abscissa of the distortion curve represents the distortion rate, the ordinate represents the image height, and the distortion curve given in fig. 6C represents that the distortion is within ± 2.5% at a wavelength of 587.5618nm, which shows that the distortion of the optical lens assembly 100 in this embodiment is better corrected and the imaging quality is better.

As can be seen from fig. 6A, 6B and 6C, the optical lens group 100 according to the third embodiment can achieve a good imaging effect.

Example four

Referring to fig. 7, the optical lens assembly 100 in the present embodiment includes a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7 and a light filter L8, which are sequentially disposed from an object side to an image side along an optical axis H, a stop ST is disposed on an image side surface of the second lens element L2, and an image plane IMG of the optical lens assembly 100 is located on a side of the light filter L8 away from the seventh lens element L7. The first lens L1 to the seventh lens L7 are all plastic aspheric lenses, and the filter L8 is an infrared cut filter L8 made of glass.

The second lens element L2 with positive and negative refractive powers has a convex object-side surface S3 at a paraxial region H, a concave image-side surface S4 at a paraxial region H, a convex object-side surface S3 at a circumference of the second lens element L2, and a concave image-side surface S4 at a circumference of the second lens element L.

The fourth lens element L4 with negative refractive power has a convex object-side surface S7 and a convex image-side surface S8 at a paraxial region H of the fourth lens element L4, wherein the object-side surface S7 of the fourth lens element L4 is concave at a circumference and the image-side surface S8 is convex at a circumference.

In the fourth embodiment, the refractive index, abbe number and focal length of the optical lens assembly 100 are all referenced to the light with the wavelength of 587.56nm, and the relevant parameters of the optical lens assembly 100 are shown in table 10. Wherein f is the effective focal length of the optical lens assembly 100, TTL is the total optical length of the optical lens assembly 100, FNO is the aperture value, FOV is the maximum field angle of the optical lens assembly 100, and the units of curvature radius, thickness and focal length are all millimeters.

TABLE 10

The calculation results of the numerical relationship between the parameters of the optical lens assembly 100 according to the present embodiment are shown in table 11.

TABLE 11

As can be seen from the results in table 11, the calculation results of the numerical relationships between the lens parameters of the optical lens assembly 100 in this embodiment satisfy the conditional expressions (1) to (9) in a one-to-one correspondence.

The conic constant K and aspherical surface coefficient corresponding to the surface of each lens in example four are shown in table 12.

TABLE 12

Noodle sequence number

S1

S2

S3

S4

S5

S6

S7

K

-5.232E+01

-3.058E+01

-6.394E+00

-9.900E+01

-9.784E+00

-6.302E+00

3.760E+01

A4

5.586E-03

-3.168E-02

1.958E-02

4.416E-02

2.158E-03

-3.503E-03

-3.600E-02

A6

-1.421E-02

1.712E-03

1.598E-02

-4.439E-02

-2.398E-02

-1.363E-02

1.405E-03

A8

1.048E-02

5.488E-03

-3.295E-02

3.183E-02

1.579E-02

2.824E-02

-9.707E-03

A10

-4.484E-03

-2.414E-03

3.154E-02

-2.460E-02

-1.122E-02

-4.365E-02

1.837E-02

A12

1.241E-03

2.659E-04

-1.815E-02

1.598E-02

1.009E-02

4.466E-02

-2.025E-02

A14

-2.151E-04

1.240E-04

6.567E-03

-7.023E-03

-6.106E-03

-2.756E-02

1.261E-02

A16

2.174E-05

-5.050E-05

-1.464E-03

1.906E-03

2.132E-03

9.992E-03

-4.524E-03

A18

-1.085E-06

7.336E-06

1.844E-04

-2.872E-04

-3.956E-04

-1.966E-03

8.639E-04

A20

1.576E-08

-3.967E-07

-1.007E-05

1.830E-05

3.020E-05

1.621E-04

-6.693E-05

Noodle sequence number

S8

S9

S10

S11

S12

S13

S14

K

-3.965E+01

-2.569E+01

2.682E+01

-3.265E+01

-3.832E+00

-1.038E+01

-6.134E+00

A4

-3.917E-02

-7.570E-02

-5.952E-02

-3.782E-02

-3.445E-02

-3.097E-02

-2.695E-02

A6

7.813E-03

2.591E-04

9.141E-04

1.639E-02

1.733E-02

1.103E-02

7.243E-03

A8

-1.899E-02

5.800E-03

1.286E-02

7.931E-03

-1.348E-03

-5.346E-03

-2.225E-03

A10

2.696E-02

-2.960E-03

-6.090E-03

-8.504E-03

-2.269E-03

1.810E-03

5.026E-04

A12

-2.305E-02

4.177E-03

1.177E-03

3.180E-03

1.438E-03

-3.836E-04

-7.629E-05

A14

1.199E-02

-3.191E-03

-1.508E-04

-6.450E-04

-3.987E-04

5.147E-05

7.473E-06

A16

-3.778E-03

1.072E-03

3.809E-05

7.415E-05

5.773E-05

-4.279E-06

-4.506E-07

A18

6.620E-04

-1.563E-04

-7.691E-06

-4.511E-06

-4.270E-06

2.010E-07

1.508E-08

A20

-4.890E-05

7.567E-06

5.591E-07

1.127E-07

1.281E-07

-4.065E-09

-2.123E-10

Fig. 8A, 8B and 8C are a spherical aberration graph, an astigmatism graph and a distortion graph, respectively, in the fourth embodiment.

The abscissa of the spherical aberration curve represents the focus offset, and the ordinate represents the normalized field of view, and when the wavelengths given in fig. 8A are 656.2725nm, 587.5618nm, and 486.1327nm, respectively, the focus offsets of different fields of view are all within ± 0.1 mm, which indicates that the optical lens assembly 100 in this embodiment has a small spherical aberration and a good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate of the astigmatism graph represents the image height, and the astigmatism curve given in fig. 8B represents that the focus offsets of the sagittal image surface and the meridional image surface are within ± 0.05 mm when the wavelength is 587.5618nm, which indicates that the astigmatism of the optical lens group 100 in this embodiment is small and the imaging quality is good.

The abscissa of the distortion curve represents the distortion rate, the ordinate represents the image height, and the distortion curve given in fig. 8C represents that the distortion is within ± 4% at a wavelength of 587.5618nm, which shows that the distortion of the optical lens assembly 100 in this embodiment is better corrected and the imaging quality is better.

As can be seen from fig. 8A, 8B and 8C, the optical lens group 100 according to the fourth embodiment can achieve a good imaging effect.

EXAMPLE five

Referring to fig. 9, the optical lens assembly 100 of the present embodiment includes a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7 and a light filter L8 sequentially disposed from an object side to an image side along an optical axis H, a stop ST is disposed on an image-side surface of the second lens element L2, and an image plane IMG of the optical lens assembly 100 is located on a side of the light filter L8 away from the seventh lens element L7. The first lens L1 to the seventh lens L7 are all plastic aspheric lenses, and the filter L8 is an infrared cut filter L8 made of glass.

The second lens element L2 with positive refractive power has a convex object-side surface S3 at a paraxial region H, a concave image-side surface S4 at a paraxial region H, a convex object-side surface S3 at a circumference of the second lens element L2, and a concave image-side surface S4 at a circumference of the second lens element L2.

The fourth lens element L4 with negative refractive power has a convex object-side surface S7 and a convex image-side surface S8 at a paraxial region H of the fourth lens element L4, wherein the object-side surface S7 of the fourth lens element L4 is circumferentially concave and the image-side surface S8 is circumferentially convex.

The fifth lens element L5 with positive refractive power has a concave object-side surface S9 at a paraxial region H and a convex image-side surface S10 at a paraxial region H of the fifth lens element L5, and the fifth lens element L5 has a concave object-side surface S9 at a circumference and a convex image-side surface S10 at a circumference.

In the fifth embodiment, the refractive index, abbe number and focal length of the optical lens assembly 100 are all referenced to light with a wavelength of 587.56nm, and the relevant parameters of the optical lens assembly 100 are shown in table 13. Wherein f is an effective focal length of the optical lens assembly 100, TTL is an optical total length of the optical lens assembly 100, FNO is an aperture value, FOV is a maximum field angle of the optical lens assembly 100, and the units of the curvature radius, the thickness and the focal length are millimeters.

Watch 13

The calculation results of the numerical relationship between the parameters of the optical lens assembly 100 according to the present embodiment are shown in table 14.

TABLE 14

As can be seen from the results in table 14, the calculation results of the numerical relationships between the lens parameters of the optical lens assembly 100 in this embodiment satisfy the conditional expressions (1) to (9) in a one-to-one correspondence.

The conic constant K and aspherical surface coefficients corresponding to the surfaces of the respective lenses in example five are shown in table 15.

Watch 15

Number of noodles

S1

S2

S3

S4

S5

S6

S7

K

-1.995E+01

-2.995E+01

-6.425E+00

-5.485E+01

-1.017E+01

-5.932E+00

-1.165E+01

A4

5.174E-03

-3.286E-02

1.986E-02

4.317E-02

-4.067E-03

-4.252E-03

-3.678E-02

A6

-1.385E-02

2.777E-03

9.350E-03

-5.077E-02

-2.787E-03

-1.084E-02

-3.366E-02

A8

1.028E-02

6.250E-03

-2.073E-02

5.436E-02

-2.117E-02

2.962E-02

8.054E-02

A10

-4.277E-03

-3.677E-03

2.014E-02

-5.491E-02

3.196E-02

-5.132E-02

-9.860E-02

A12

1.097E-03

9.290E-04

-1.183E-02

3.870E-02

-2.329E-02

5.482E-02

7.116E-02

A14

-1.647E-04

-6.162E-05

4.371E-03

-1.736E-02

1.025E-02

-3.480E-02

-3.196E-02

A16

1.238E-05

-2.072E-05

-9.926E-04

4.745E-03

-2.747E-03

1.290E-02

8.758E-03

A18

-1.930E-07

4.766E-06

1.270E-04

-7.187E-04

4.152E-04

-2.579E-03

-1.352E-03

A20

-1.885E-08

-3.056E-07

-7.020E-06

4.615E-05

-2.770E-05

2.140E-04

9.127E-05

Noodle sequence number

S8

S9

S10

S11

S12

S13

S14

K

-6.548E+01

-6.667E+01

2.696E+01

-3.322E+01

-4.295E+00

-1.150E+01

-5.465E+00

A4

-4.283E-02

-7.519E-02

-6.448E-02

-4.797E-02

-3.136E-02

-3.517E-02

-2.615E-02

A6

1.558E-02

1.751E-02

2.180E-02

3.670E-02

1.662E-02

1.542E-02

6.396E-03

A8

-3.170E-02

-2.539E-02

-1.249E-02

-6.613E-03

-4.291E-03

-7.560E-03

-1.997E-03

A10

3.832E-02

2.633E-02

1.413E-02

-3.543E-03

3.884E-04

2.589E-03

4.882E-04

A12

-2.835E-02

-1.280E-02

-1.011E-02

2.353E-03

3.797E-04

-5.656E-04

-8.114E-05

A14

1.304E-02

3.004E-03

3.875E-03

-5.985E-04

-1.636E-04

7.822E-05

8.644E-06

A16

-3.683E-03

-2.650E-04

-8.090E-04

7.869E-05

2.746E-05

-6.644E-06

-5.617E-07

A18

5.830E-04

-8.824E-06

8.742E-05

-5.249E-06

-2.149E-06

3.161E-07

2.015E-08

A20

-3.923E-05

1.861E-06

-3.827E-06

1.397E-07

6.525E-08

-6.444E-09

-3.037E-10

Fig. 10A, 10B and 10C are a spherical aberration graph, an astigmatism graph and a distortion graph of the fifth embodiment, respectively.

The abscissa of the spherical aberration graph represents the focus offset, and the ordinate represents the normalized field of view, and the focus offsets of different fields of view are within ± 0.5 mm when the wavelengths given in fig. 10A are 656.2725nm, 587.5618nm, and 486.1327nm, respectively, which illustrates that the optical lens assembly 100 in this embodiment has a small spherical aberration and a good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate of the astigmatism graph represents the image height, and the astigmatism curve given in fig. 10B represents that the focus offsets of the sagittal image surface and the meridional image surface are within ± 0.2 mm when the wavelength is 587.5618nm, which indicates that the astigmatism of the optical lens group 100 in this embodiment is small and the imaging quality is good.

The abscissa of the distortion curve represents the distortion rate, the ordinate represents the image height, and the distortion curve given in fig. 10C represents the distortion within ± 2.5% at a wavelength of 587.5618nm, which shows that the distortion of the optical lens assembly 100 in this embodiment is better corrected and the imaging quality is better.

As can be seen from fig. 10A, 10B and 10C, the optical lens group 100 according to the fifth embodiment can achieve a good imaging effect.

EXAMPLE six

Referring to fig. 11, the optical lens assembly 100 in the present embodiment includes a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7 and a light filter L8, which are sequentially disposed from an object side to an image side along an optical axis H, a stop ST is disposed on an image side surface of the second lens element L2, and an image plane IMG of the optical lens assembly 100 is located on a side of the light filter L8 away from the seventh lens element L7. The first lens L1 to the seventh lens L7 are all plastic aspheric lenses, and the filter L8 is an infrared cut filter L8 made of glass.

The first lens element L1 with negative refractive power has a concave object-side surface S1 and a concave image-side surface S2 at a paraxial region H of the first lens element L1, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are circumferentially convex.

The second lens element L2 with positive and negative refractive powers has a convex object-side surface S3 and a convex image-side surface S4 at a paraxial region H of the second lens element L2, and a convex object-side surface S3 and a convex image-side surface S4 of the second lens element L2 are circumferentially convex.

The seventh lens element L7 with positive refractive power has a convex object-side surface S13 at a paraxial region H and a concave image-side surface S14 at a paraxial region H, and the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are concave at a circumference and convex at a circumference.

In the sixth embodiment, the refractive index, abbe number and focal length of the optical lens assembly 100 are all based on the light with the wavelength of 587.56nm, and the relevant parameters of the optical lens assembly 100 are shown in table 16. Wherein f is the effective focal length of the optical lens assembly 100, TTL is the total optical length of the optical lens assembly 100, FNO is the aperture value, FOV is the maximum field angle of the optical lens assembly 100, and the units of curvature radius, thickness and focal length are all millimeters.

TABLE 16

The calculation results of the numerical relationship between the parameters of the optical lens assembly 100 according to the present embodiment are shown in table 17.

TABLE 17

Conditional formula (II)	Numerical value	Conditional formula (II)	Numerical value
				f456/f2	8.553	f/EPD	1.9
f1/f	-0.924	R11/R10	4.47
				f2+f6)/f	2.21	\|f7\|/R14	13.7
TT/DT11	2.67	CT6/\|SAG61\|	2.056
				FFL/Imgh	0.466

As can be seen from the results in table 17, the calculation results of the numerical relationships between the lens parameters of the optical lens assembly 100 in the present embodiment satisfy the conditional expressions (1) to (9) in a one-to-one correspondence manner.

The conic constant K and aspherical surface coefficient corresponding to the surface of each lens in example six are shown in table 18.

Watch 18

Number of noodles

S1

S2

S3

S4

S5

S6

S7

K

9.900E+01

-2.938E+01

-6.242E+00

9.900E+01

-9.653E+00

-6.065E+00

5.445E+01

A4

5.567E-05

-3.759E-02

1.952E-02

2.973E-02

-4.050E-03

-3.632E-03

-2.686E-02

A6

-1.344E-02

-3.423E-04

2.278E-02

-1.223E-02

-2.206E-02

-8.138E-03

-3.203E-03

A8

1.451E-02

2.091E-02

-4.765E-02

-1.631E-02

3.394E-02

7.770E-03

2.693E-03

A10

-8.494E-03

-1.972E-02

5.508E-02

3.382E-02

-4.443E-02

-3.259E-04

-1.674E-02

A12

3.204E-03

1.030E-02

-4.033E-02

-3.246E-02

4.254E-02

-4.378E-03

2.813E-02

A14

-7.807E-04

-3.307E-03

1.865E-02

1.830E-02

-2.592E-02

4.183E-03

-2.297E-02

A16

1.180E-04

6.425E-04

-5.258E-03

-6.104E-03

9.333E-03

-2.051E-03

1.027E-02

A18

-9.983E-06

-6.885E-05

8.193E-04

1.113E-03

-1.777E-03

5.459E-04

-2.450E-03

A20

3.598E-07

3.109E-06

-5.370E-05

-8.509E-05

1.359E-04

-6.068E-05

2.429E-04

Number of noodles

S8

S9

S10

S11

S12

S13

S14

K

-9.609E+01

-2.879E+01

-2.228E+01

-2.031E+01

-4.898E+00

-5.241E+00

-3.505E+00

A4

-3.021E-02

-1.242E-01

-9.775E-02

-4.409E-02

-2.390E-02

-1.629E-02

-1.847E-02

A6

-1.706E-02

1.135E-01

1.079E-01

3.545E-02

1.511E-03

-6.851E-03

-1.364E-03

A8

6.060E-03

-1.172E-01

-9.659E-02

-9.301E-03

4.843E-03

4.408E-03

1.446E-03

A10

-5.976E-03

4.735E-02

5.427E-02

-2.757E-03

-1.086E-03

-1.329E-03

-4.076E-04

A12

5.623E-03

1.566E-02

-1.833E-02

2.796E-03

-5.326E-05

2.475E-04

6.527E-05

A14

-6.219E-04

-2.156E-02

3.418E-03

-8.781E-04

4.304E-05

-2.957E-05

-6.562E-06

A16

-9.751E-04

8.056E-03

-2.554E-04

1.398E-04

-5.234E-06

2.163E-06

4.097E-07

A18

3.692E-04

-1.361E-03

-1.150E-05

-1.139E-05

2.196E-07

-8.448E-08

-1.459E-08

A20

-3.833E-05

8.924E-05

2.145E-06

3.777E-07

-1.108E-09

1.252E-09

2.287E-10

Fig. 12A, 12B, and 12C are a spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, in the sixth embodiment.

The abscissa of the spherical aberration curve represents the focus offset, and the ordinate represents the normalized field of view, and when the wavelengths given in fig. 12A are 656.2725nm, 587.5618nm, and 486.1327nm, respectively, the focus offsets of different fields of view are all within ± 0.05 mm, which indicates that the optical lens assembly 100 in this embodiment has a small spherical aberration and a good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate of the astigmatism graph represents the image height, and the astigmatism curve given in fig. 12B represents that the focus offsets of the sagittal image surface and the meridional image surface are within ± 0.1 mm when the wavelength is 587.5618nm, which indicates that the astigmatism of the optical lens group 100 in this embodiment is small and the imaging quality is good.

The abscissa of the distortion curve represents the distortion rate, the ordinate represents the image height, and the distortion curve given in fig. 12C represents that the distortion is within ± 4% at a wavelength of 587.5618nm, which shows that the distortion of the optical lens assembly 100 in this embodiment is better corrected and the imaging quality is better.

As can be seen from fig. 12A, 12B and 12C, the optical lens group 100 according to the sixth embodiment can achieve a good imaging effect.

As shown in fig. 13, in some embodiments of the present application, a camera module 200 is further provided, where the camera module 200 includes a photosensitive element 210 and the optical lens assembly 100 described in any of the above embodiments. The light sensing element 210 is disposed in the image plane of the optical lens assembly 100 to receive light of an image formed by the optical lens assembly 100. The photosensitive element 210 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). When assembled, the image plane of the optical lens group 100 overlaps the light-sensing surface 211 of the light-sensing element 210.

As shown in fig. 14, in some embodiments of the present application, an electronic apparatus 300 is further provided, and the image capturing module 200 is applied to the electronic apparatus 300 to enable the electronic apparatus 300 to have an image capturing function. Specifically, the electronic device 300 includes a fixing member 310 and the camera module 200 as described above, and the camera module 200 is mounted on the fixing member 310 for capturing an image. The fixing member 310 may be a circuit board, a middle frame, a protection case, or the like. The electronic device 300 may be, but is not limited to, a smart phone, a smart watch, an electronic book, a reader, a vehicle-mounted camera, a monitoring device, a medical device, a tablet computer, a biometric device PDA (Personal digital assistant), an unmanned aerial vehicle, and the like. Taking the electronic device 300 as a mobile phone as an example, the camera module 200 can be installed in a housing of the mobile phone, as shown in fig. 14, which is a front view of the camera module 200 installed in the housing of the mobile phone.

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 should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", 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 device or element referred to must have a specific orientation, be constructed in a specific orientation and operate, 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 can be understood according to the specific situation by those skilled in the art.

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, comprising, in order from an object side to an image side along an optical axis:

a first lens element with negative refractive power, an image-side surface of the first lens element being concave at a paraxial region;

a second lens having a positive refracting power;

a fourth lens having a bending force;

a fifth lens element with a bending power, an object-side surface of the fifth lens element being concave at a paraxial region and an image-side surface of the fifth lens element being convex at a paraxial region;

a sixth lens element with positive refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;

a seventh lens with a bending force, an object side surface or an image side surface of the seventh lens having at least one inflection point;

the optical lens group satisfies the following conditional expression: 1.0 n/456/f 2<10.0, -1.5 n/f < -0.5, wherein f456 is the combined effective focal length of the fourth lens, the fifth lens and the sixth lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens and f is the effective focal length of the optical lens group.

2. Optical lens group according to claim 1, characterized in that it satisfies the conditional expression: 0.9< (f 2+ f 6)/f <2.5; wherein f2 is a focal length of the second lens element, f6 is a focal length of the sixth lens element, and f is an effective focal length of the optical lens assembly.

3. Optical lens group according to claim 1, characterized in that it satisfies the conditional expression: 2.3 instead of TT/DT11<2.9, wherein TT is the distance on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens, and DT11 is the effective half aperture of the object side surface of the first lens.

4. Optical lens group according to claim 1, characterized in that it satisfies the conditional expression: FFL/Imgh is more than or equal to 0.3, wherein FFL is the distance from the highest point of the image side surface of the seventh lens element along the direction parallel to the optical axis to the imaging surface of the optical lens group along the direction parallel to the optical axis, and Imgh is half of the image height corresponding to the maximum field angle of the optical lens group.

5. Optical lens group according to claim 1, characterized in that it satisfies the conditional expression: f/EPD is more than or equal to 1.7 and less than or equal to 1.9, wherein f is the effective focal length of the optical lens group, and EPD is the entrance pupil diameter of the optical lens group.

6. Optical lens group according to claim 1, characterized in that it satisfies the conditional expression: 0.5< -R11/R10 <5.0, where R10 is a radius of curvature of an object-side surface of the fifth lens element at a paraxial region, and R11 is a radius of curvature of an image-side surface of the fifth lens element at a paraxial region.

7. Optical lens group according to claim 1, characterized in that it satisfies the conditional expression: 0.5< | f7|/R14<15.0, wherein f7 is the focal length of the seventh lens and R14 is the radius of curvature of the object-side surface of the seventh lens at paraxial region.

8. Optical lens group according to claim 1, characterized in that it satisfies the conditional expression: 1.5 instead of CT6/| SAG61| <4.0, wherein CT6 is the thickness of the sixth lens on the optical axis, and SAG61 is the rise of the object-side surface of the sixth lens at the maximum clear aperture.

9. The utility model provides a module of making a video recording which characterized in that includes:

an optical mirror group as claimed in any one of claims 1 to 8; and the number of the first and second groups,

and the photosensitive element is arranged in an imaging surface of the optical lens group.

10. An electronic device, comprising:

a fixing member; and a (C) and (D) and,

the camera module of claim 9, said camera module mounted on said fixture.