CN212989753U

CN212989753U - Optical lens group, camera module and terminal

Info

Publication number: CN212989753U
Application number: CN202021790171.6U
Authority: CN
Inventors: 王妮妮; 刘彬彬; 李明; 邹海荣
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2021-04-16
Anticipated expiration: 2030-08-24

Abstract

The application discloses optical lens group, camera module and terminal. The optical lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object plane to an image plane along an optical axis, wherein the first lens has positive bending power, the object side surface at a position close to the optical axis is a convex surface, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens respectively have bending power, and the maximum effective diameter of the image side surface of the seventh lens is Y7₂Object side of the first lens element to the systemThe distance of the imaging surface of the system at the optical axis is TTL, and the thickness of the edge of the optical effective diameter of the object side surface of the seventh lens element is ET₇The focal length of the optical lens group is f, Y7₂，TTL，ET₇And f satisfies the following conditional expressions: less than or equal to 3 (Y7)₂*TTL)/(ET₇F) is less than or equal to 8. Through the arrangement, the long-focus characteristic of the optical lens group and the whole thickness of the optical camera lens can be balanced, and the maximum diameter of the optical camera lens is reduced while the forming yield of the seventh lens is ensured.

Description

Optical lens group, camera module and terminal

Technical Field

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

Background

At present, in order to shoot a far scene and a shallow depth of field, a main imaging object is highlighted, and in order to match a chip with a high pixel size, the industry is beginning to develop a long-focus lens model. The traditional camera mounted on an electronic device adopts a multi-piece lens structure, and based on the same chip, in order to obtain higher image definition, the total length of the lens is increased, the light incoming amount of the lens is influenced, the whole lens is very thick, the light and thin of the lens are restricted, and the assembly difficulty of the lens is increased.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an optical lens group, camera module and terminal, can solve the too massive problem of camera lens, when guaranteeing higher image definition, can reduce the overall length of camera lens, make the camera lens more frivolous.

In a first aspect, an embodiment of the present invention provides an optical lens assembly, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element sequentially disposed along an optical axis from an object-side surface to an image-side surface, wherein the first lens element has a positive refractive power, the object-side surface at a position close to the optical axis is a convex surface, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element each have a refractive power, and a maximum effective diameter of an image-side surface of the seventh lens element is Y7₂The distance from the object side surface of the first lens element to the imaging surface of the system at the optical axis is TTL, and the edge thickness of the seventh lens element is ET₇The focal length of the optical lens group is f, Y7₂、TTL、ET₇And f satisfies the following conditional expressions: less than or equal to 3 (Y7)₂*TTL)/(ET₇*f)≤ 8。

Based on the optical lens group of the embodiment of the present application, the imaging area of the image-side surface of the seventh lens element is determined by defining the maximum effective diameter of the image-side surface of the seventh lens element, and the product of the maximum effective diameter of the image-side surface of the seventh lens element and the distance from the object-side surface of the first lens element to the imaging surface of the system at the optical axis and the product of the edge thickness of the seventh lens element and the focal length of the optical lens group are defined to satisfy: less than or equal to 3 (Y7)₂*TTL)/(ET₇F) is less than or equal to 8, the telephoto characteristic of the optical lens group can be balanced, the thickness of the optical pick-up lens can be reduced, the maximum effective diameter of the image side surface of the seventh lens and the edge thickness of the seventh lens are limited, the maximum diameter of the optical lens group is reduced while the forming yield of the seventh lens is ensured, and the miniaturization and the lightness of the whole optical lens group are facilitated.

In some embodiments, the entrance pupil diameter of the optical lens group is EPD, and TTL and EPD satisfy the following conditional expressions: TTL/EPD is more than or equal to 1.5 and less than or equal to 3.

Based on the above embodiment, the ratio of the distance from the object-side surface of the first lens element to the imaging surface of the system at the optical axis to the entrance pupil diameter of the optical lens group is defined as TTL/EPD being greater than or equal to 1.5 and less than or equal to 3, so that a larger entrance pupil can be provided, the aperture can be enlarged, the imaging quality can be improved, the service time and space of the carrier can be enlarged, the total length of the optical lens group can be smaller, and the light entering amount can be increased. When the ratio of the distance from the object side surface of the first lens element to the imaging surface of the system at the paraxial region to the diameter of the entrance pupil exceeds the upper limit of 3, the imaging depth of the system is not favorable, and the brightness of the field of view is insufficient, which reduces the sharpness of the imaging system.

In some of these embodiments, the first lens has an effective object-side surface with an inner most-curved angle AL1S₁The most bending angle in the effective diameter of the object side surface of the second lens is AL2S₁，AL1S₁、AL2S₁And f satisfies the following conditional expressions: less than or equal to 8deg/mm (| AL 1S)₁∣+∣AL2S₁∣)/f≤12deg/mm。

Based on the above embodiment, the ratio between the sum of the absolute value of the most bending angle in the effective diameter of the object-side surface of the first lens element and the absolute value of the most bending angle in the effective diameter of the object-side surface of the second lens element and the focal length of the optical lens assembly is limitedThe following conditions are satisfied: less than or equal to 8deg/mm (| AL 1S)₁∣+∣AL2S₁| f is less than or equal to 12deg/mm, the most bending angle in the effective diameter of the object side surface of the first lens and the most bending angle in the effective diameter of the object side surface of the second lens can be effectively controlled, thereby being beneficial to determining the shape of the first lens in the second lens, reducing the production sensitivity of the first lens and realizing the long-focus characteristic.

In some of the embodiments, an average value of d-line abbe numbers of the first lens to the seventh lens is MVd, and MVd and f satisfy the following conditional expressions: 5mm^-1≤MVd/f≤10mm^-1。

Based on the above-described embodiment, by defining the ratio between the average value of the abbe numbers of the first to seventh lenses and the focal length of the optical lens group to satisfy: 5mm^-1≤MVd/f≤10mm^-1The chromatic aberration can be balanced, the high d-line Abbe number and the low d-line Abbe number correspond to different refractive indexes, and the long-focus characteristic and the optical imaging performance can be realized through the combination of lenses made of different materials.

In some of these embodiments, the first lens has an edge thickness ET₁The thickness of the first lens at the optical axis is CT₁， ET₁、CT₁And f satisfies the following conditional expressions: 0mm^-1≤ET₁/(CT₁*f)≤0.5mm^-1。

Based on the above-described embodiment, by defining the ratio between the edge thickness of the first lens and the product of the thickness of the first lens at the optical axis and the focal length of the optical lens group to satisfy: 0mm^-1≤ET₁/(CT₁*f)≤0.5mm^-1The relative size of the thickness of the first lens can be effectively determined, the molding of the first lens can be facilitated, the long-focus characteristic can be realized, and the processing and the production of the first lens are facilitated.

In some of these embodiments, the seventh lens has a thickness CT at the optical axis₇，ET₇、CT₇And f satisfies the following conditional expressions: 0mm^-1≤ET₇/(CT₇*f)≤0.5mm^-1。

Based on the above embodiment, the edge thickness of the seventh lens and the thickness and optical property of the seventh lens at the optical axis are adjustedThe ratio between the products of the focal lengths of the lens groups is defined to satisfy: 0mm^-1≤ET₇/(CT₇*f)≤0.5mm^-1The relative size of the thickness of the seventh lens can be effectively determined, the seventh lens can be favorably molded, the long-focus characteristic is realized, and the seventh lens is convenient to process and produce.

In some embodiments, the entrance pupil diameter of the optical lens group is EPD, EPD and f satisfy the following condition: EPD/f is more than or equal to 0 and less than or equal to 1.

Based on the above embodiment, by defining the ratio between the entrance pupil diameter of the optical lens group and the focal length of the optical lens group to satisfy: the EPD/f is more than or equal to 0 and less than or equal to 1, a larger entrance pupil can be provided, the aperture can be enlarged, the imaging quality is favorably improved, the using time and the space of the carrier are enlarged, the light flux and the image plane can be balanced to move backwards, and the characteristics of a large aperture and a long focal length are realized.

In some of the embodiments, the projection of the effective zone edge of the object side surface of the third lens on the optical axis to the intersection point of the object side surface of the third lens and the optical axis is SAG3₂The air interval between the third lens and the fourth lens at the optical axis is CT₃₄，SAG3₂And CT₃₄The following conditional expressions are satisfied: 0 ≦ SAG3₂∣/CT₃₄≤1。

Based on the above-described embodiment, by defining the ratio of the absolute value of the rise of the image-side surface of the third lens to the air interval of the third lens and the fourth lens at the paraxial region to satisfy: 0 ≦ SAG3₂∣/CT ₃₄1, through the reasonable layout of the optical structure, the direction change of light rays entering the system can be slowed down, the intensity of stray light is reduced, the sensitivity of the system is reduced, and the yield of the third lens is improved.

In some of the embodiments, the projection of the effective zone edge of the object side surface of the fourth lens on the optical axis to the intersection point of the object side surface of the fourth lens on the optical axis is SAG4₁The air interval between the third lens and the fourth lens at the optical axis is CT₃₄，SAG4₁And CT₃₄The following conditional expressions are satisfied: 0 ≦ SAG4₁∣/CT₃₄≤1。

Based on the aboveIn an embodiment, the ratio of the absolute value of the rise of the object-side surface of the fourth lens to the air space of the third lens and the fourth lens at the paraxial region is defined so as to satisfy: 0 ≦ SAG4₁∣/CT ₃₄1, through the reasonable layout of the optical structure, the direction change of light rays entering the system can be slowed down, the intensity of ghost images is reduced, the sensitivity of the system is reduced, and the yield of the fourth lens is improved.

In some embodiments, half of the length of the diagonal line of the effective pixel area on the image plane of the optical lens group is ImgH, and the TTL and ImgH satisfy the following conditions: TTL |. ImgH is more than or equal to 2 and less than or equal to 3.

Based on the above embodiment, a ratio of a distance at the optical axis from the object side surface of the first lens to the imaging surface of the system to half of the diagonal length of the effective pixel region on the image surface is defined to satisfy: TTL |. ImgH is more than or equal to 2 and less than or equal to 3, which not only can ensure the high pixel imaging quality of the system, but also can control the total length of the optical lens group, and minimize the volume of the camera composed of the optical lens group.

In a second aspect, an embodiment of the present application provides a camera module, which includes the optical lens group and the image sensor of any of the above embodiments, the optical lens group is configured to receive an optical signal of a subject and project the optical signal to the image sensor, and the image sensor is configured to convert the optical signal corresponding to the subject into an image signal.

In a third aspect, an embodiment of the present application provides a terminal, including the camera module in the foregoing embodiment.

Based on an optical lens group, camera module and terminal of this application embodiment, through setting up first lens to have positive dioptric power, and first lens is the convex surface in the object side of paraxial department, the second lens, the third lens, the fourth lens, the fifth lens, sixth lens and seventh lens are all had the dioptric power respectively, and inject some sizes of seventh lens, can balance the many telephoto characteristics of optical lens group, can reduce optical camera lens's thickness again, inject the most effective diameter of seventh lens image side and the marginal thickness of seventh lens, guarantee that seventh lens shaping yield reduces optical lens group's maximum diameter simultaneously, be favorable to making whole optical lens group miniaturized and frivolous, thereby reduce the equipment degree of difficulty of whole camera lens. The ratio of the distance from the object side surface of the first lens to the imaging surface of the system at the paraxial region to the entrance pupil diameter of the optical lens group is limited, a larger entrance pupil can be provided, the aperture is enlarged, the light entering amount is increased, the imaging quality is improved, the service time and the space of the carrier are enlarged simultaneously, the total length of the optical lens group is smaller, the light entering amount is increased, the related data of the first lens and the seventh lens are limited, the optical lens group is convenient to assemble with other components of the lens, the thickness of the whole optical lens group can be reduced, and the whole lens is lighter and thinner.

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 diagram of an optical lens assembly for imaging according to an embodiment of the present disclosure;

fig. 2 is a spherical aberration chart of the optical lens assembly for imaging according to the first embodiment of the present application, in which the horizontal and vertical scales represent focus offset, and the vertical scale represents normalized field angle;

fig. 3 is an astigmatism graph of an optical lens assembly for imaging according to an embodiment of the present application, wherein an abscissa represents a focus offset, and an ordinate represents an image height;

fig. 4 is a distortion curve diagram of an optical lens assembly for image formation according to an embodiment of the present application, in which an abscissa represents distortion and an ordinate represents image height;

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

fig. 6 is a spherical aberration curve chart of the optical lens assembly for imaging according to the second embodiment of the present application, in which the horizontal and vertical scales represent focus offset, and the vertical scale represents normalized field angle;

fig. 7 is an astigmatism graph of the optical lens assembly for imaging according to the second embodiment of the present application, in which an abscissa represents a focus offset, and an ordinate represents an image height;

fig. 8 is a distortion curve diagram of an optical lens assembly for image formation according to a second embodiment of the present application, in which the abscissa represents distortion and the ordinate represents image height;

fig. 9 is a schematic structural diagram of an optical lens assembly for imaging according to a third embodiment of the present application;

fig. 10 is a spherical aberration chart of the optical lens assembly for imaging according to the third embodiment of the present application, in which the horizontal and vertical scales represent focus offset, and the vertical scale represents normalized field angle;

fig. 11 is an astigmatism graph of an optical lens assembly for imaging according to a third embodiment of the present application, in which an abscissa represents a focus offset and an ordinate represents an image height;

fig. 12 is a distortion curve diagram of an optical lens assembly for image formation according to a third embodiment of the present application, in which the abscissa represents distortion and the ordinate represents image height;

fig. 13 is a schematic structural diagram of an optical lens assembly for imaging according to a fourth embodiment of the present application;

fig. 14 is a spherical aberration chart of the optical lens assembly for imaging according to the fourth embodiment of the present application, in which the horizontal and vertical scales represent focus offset amounts, and the vertical scale represents a normalized field angle;

fig. 15 is an astigmatism graph of an optical lens assembly for imaging according to the fourth embodiment of the present application, in which the abscissa represents a focus offset and the ordinate represents an image height;

fig. 16 is a distortion curve diagram of an optical lens assembly for image formation according to a fourth embodiment of the present application, in which the abscissa represents distortion and the ordinate represents image height;

fig. 17 is a schematic structural view of an optical lens group for imaging provided in example five of the present application;

fig. 18 is a spherical aberration chart of the optical lens assembly for imaging according to the fifth embodiment of the present application, in which the horizontal and vertical scales represent focus offset amounts, and the vertical scale represents a normalized field angle;

fig. 19 is an astigmatism graph of an optical lens assembly for imaging according to a fifth embodiment of the present application, in which an abscissa represents a focus offset and an ordinate represents an image height;

fig. 20 is a distortion curve diagram of an optical lens assembly for image formation provided in the fifth embodiment of the present application, in which the abscissa represents distortion and the ordinate represents image height;

fig. 21 is a schematic structural diagram of an optical lens assembly for imaging according to a sixth embodiment of the present application;

fig. 22 is a spherical aberration chart of the optical lens assembly for imaging according to the sixth embodiment of the present application, in which the horizontal and vertical scales represent focus offset amounts, and the vertical scale represents a normalized field angle;

fig. 23 is an astigmatism graph of an optical lens assembly for imaging according to a sixth embodiment of the present application, in which an abscissa represents a focus offset and an ordinate represents an image height;

fig. 24 is a distortion curve diagram of an optical lens assembly for image formation according to a sixth embodiment of the present application, in which the abscissa represents distortion and the ordinate represents image height;

fig. 25 is a schematic structural diagram of an optical imaging lens assembly according to a seventh embodiment of the present application;

fig. 26 is a spherical aberration chart of the optical lens assembly for imaging according to the seventh embodiment of the present application, in which the horizontal and vertical scales represent focus offset amounts, and the vertical scale represents normalized field angles;

fig. 27 is an astigmatism graph of an optical lens assembly for imaging according to a seventh embodiment of the present application, in which an abscissa represents a focus offset and an ordinate represents an image height;

fig. 28 is a distortion graph of the optical lens assembly for imaging according to the seventh embodiment of the present application, in which the abscissa represents distortion and the ordinate represents image height.

Reference numerals: 110-a first lens; 120-a second lens; 130-a third lens; 140-a fourth lens; 150-a fifth lens; 160-sixth lens; 170-seventh lens; 180-diaphragm; 200-an infrared filter; s1 — the object side of the first lens; s2 — an image side surface of the first lens; s3-the object side of the second lens; s4 — an image side surface of the second lens; s5-the object side of the third lens; s6-the image side of the third lens; s7-the object side of the fourth lens; s8-the image side of the fourth lens; s9-the object side of the fifth lens; s10-the image side of the fifth lens; s11-the object side of the sixth lens; s12-the image side of the sixth lens; s13-the object side of the seventh lens; s14-the image side of the seventh lens; s15 — first surface; s16 — a second surface; s17 — image plane.

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.

The aberrations referred to in the embodiments of the present application are explained first below; aberration (aberration) is a deviation from an ideal state of gaussian optics (first order approximation theory or paraxial ray) in an optical system, in which a result of non-paraxial ray tracing and a result of paraxial ray tracing do not coincide with each other. Aberrations fall into two broad categories: chromatic aberration and monochromatic aberration. The chromatic aberration is an aberration generated by different refractive indexes when light with different wavelengths passes through the lens, and can be divided into two types, namely, a position chromatic aberration and a magnification chromatic aberration. Chromatic aberration is a chromatic dispersion phenomenon, in which the speed or refractive index of light in a medium varies with the wavelength of light, the dispersion in which the refractive index of light decreases with increasing wavelength can be referred to as normal dispersion, and the dispersion in which the refractive index increases with increasing wavelength can be referred to as negative dispersion (or negative inverse dispersion). Monochromatic aberration is aberration that occurs even when monochromatic light is highly produced, and is divided into two categories, that is, "blurring" and "deforming" according to the effect produced; the former type includes spherical aberration (spherical aberration for short), astigmatism (astigmatism) and the like, and the latter type includes field curvature (field curvature for short), distortion (distortion) and the like. The aberration also includes coma aberration, which is a single-color conical light beam emitted from a certain off-axis object point outside the main axis to the optical system, and after being refracted by the optical system, the single-color conical light beam cannot be combined into a clear point at an ideal plane, but is combined into a comet-shaped light spot dragging a bright tail.

In the prior art, an optical lens group generally includes a plurality of lenses, a conventional camera mounted on an electronic device adopts a multi-piece lens structure, and based on the same chip, in order to obtain higher image definition, the total length of the lens is increased, and the light input amount of the lens is affected, so that the whole lens looks very thick and heavy, thereby limiting the lightness and thinness of the lens, and increasing the assembly difficulty of the lens.

In order to solve the above technical problem, in a first aspect, the present application provides an optical lens assembly, including a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, and a seventh lens element 170, which are sequentially disposed along an optical axis from an object side surface to an image side surface. The first lens element 110 has positive refractive power, and the object-side surface of the first lens element 110 near the optical axis is convex, and the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 each have refractive power.

To facilitate the control of the thickness of the entire optical lens assembly, the maximum effective diameter of the image-side surface S14 of the seventh lens element is Y7₂，Y7₂That is, the diameter of the optical imaging area of the image-side surface S14 of the seventh lens. The distance from the object side surface S1 of the first lens to the imaging surface S17 of the system at the optical axis is TTL, and the edge thickness of the seventh lens 170 is ET₇The focal length of the optical lens assembly is f, and the maximum effective diameter Y7 of the image-side surface S14 of the seventh lens element₂TTL, a distance TTL from the object-side surface S1 of the first lens element to the system image plane S17 at the optical axis, and an edge thickness ET of the seventh lens element 170₇And the focal length f of the optical lens group meets the following conditional expression: less than or equal to 3 (Y7)₂*TTL)/(ET₇F) is less than or equal to 8. And further such that Y7₂、TTL、ET₇And the value range of the limiting formula of f is more accurate, Y7₂、TTL、 ET₇And f satisfies: 3.876 is less than or equal to (Y7)₂*TTL)/(ET₇F) is less than or equal to 7.453. The maximum effective diameter of the image side surface S14 passing through the seventh lens is Y7₂TTL distance between object side surface S1 of the first lens element and image plane S17 of the system at the optical axis, edge thickness of the seventh lens element 170Is ET₇The focal length of the optical lens group is defined reasonably by the relation between f, so that the telephoto characteristic of the optical lens group can be balanced, the thickness of the optical pick-up lens can be reduced, the maximum effective diameter of the image side surface S14 of the seventh lens and the edge thickness of the seventh lens 170 are defined, the maximum diameter of the optical lens group is reduced while the forming yield of the seventh lens 170 is ensured, the whole optical lens group is favorably miniaturized and thinned, and the assembling difficulty of the whole lens is reduced.

In order to enlarge the aperture of the entire optical lens assembly, the entrance pupil diameter of the optical lens assembly is EPD, the distance TTL from the object-side surface S1 of the first lens element to the image plane S17 of the system at the optical axis and the entrance pupil diameter EPD of the optical lens assembly satisfy the following condition: 1.5 is less than or equal to TTL/EPD is less than or equal to 3, and further, in order to make the value ranges of the distance TTL from the object-side surface S1 of the first lens element to the imaging surface S17 of the system at the optical axis and the limiting formula of the entrance pupil diameter EPD of the optical lens assembly more accurate, the distance TTL from the object-side surface S1 of the first lens element to the imaging surface S17 of the system at the optical axis and the entrance pupil diameter EPD of the optical lens assembly satisfy: TTL/EPD is more than or equal to 1.904 and less than or equal to 2.79. Through the reasonable limitation of the distance TTL from the object side surface S1 of the first lens to the imaging surface S17 of the system at the optical axis and the entrance pupil diameter EPD of the optical lens group, a larger entrance pupil can be provided, the aperture can be enlarged, the imaging quality can be improved, the service time and the space of a carrier can be enlarged, the total length of the optical lens group can be smaller, and the light entering amount can be increased. When the ratio of the distance from the object side surface S1 of the first lens to the imaging surface S17 of the system at the optical axis to the entrance pupil diameter exceeds the upper limit of 3, the imaging depth of the system is not favorable, and the brightness of the field of view is insufficient, which may reduce the sharpness of the imaging system.

To facilitate shaping the first lens element 110 and the second lens element 120, the object-side surface S1 of the first lens element has an effective radius with a maximum curvature angle AL1S₁The most bending angle in the object-side effective path of the second lens 120 is AL2S₁，AL1S₁、AL2S₁And f satisfies the following conditional expressions: less than or equal to 8deg/mm (| AL 1S)₁∣+∣AL2S₁| f ≦ 12 deg/mm. Further, in order to make AL1S₁、 AL2S₁And f is more accurate, AL1S₁、AL2S₁And f is further defined as satisfying: 8.541deg/mm ≦ (| AL 1S)₁∣+∣AL2S₁| f ≦ 11.399 deg/mm. The most bending angle in the effective diameter of the object side surface S1 of the first lens is AL1S₁The most bending angle in the effective diameter of the object side of the second lens element 120 is AL2S₁And f, the most bending angle in the effective diameter of the object side surface of the first lens 110 and the most bending angle in the effective diameter of the object side surface of the second lens 120 can be effectively controlled, so that the shape of the first lens 110 on the second lens 120 can be determined, the production sensitivity of the first lens 110 can be reduced, and the telephoto characteristic can be realized.

The d-line abbe numbers of the lenses are related to the chromatic aberration of the whole optical lens assembly, so the average value of the d-line abbe numbers of the first lens 110 to the seventh lens 170 is MVd, and the average value of the d-line abbe numbers of the first lens 110 to the seventh lens 170 and the focal length f of the optical lens assembly satisfy the following conditional expressions: 5mm^-1≤MVd/f≤10mm^-1. Further, in order to make the value range of the limiting relation between the average value MVd of the d-line abbe numbers of the first lens element 110 to the seventh lens element 170 and the focal length f of the optical lens assembly more accurate, the relation between the average value MVd of the d-line abbe numbers of the first lens element 110 to the seventh lens element 170 and the focal length f of the optical lens assembly is further defined as: 5.555mm^-1≤MVd/f≤9.044mm^-1. The above-mentioned definition relation between the average value of the d-line abbe numbers of the first lens element 110 to the seventh lens element 170 and the focal length of the optical lens assembly is defined reasonably, so that the chromatic aberration of the whole optical lens assembly can be balanced, and the high abbe number and the low abbe number correspond to different refractive indexes, generally, the larger the refractive index of the medium is, the more the chromatic dispersion is, and the smaller the abbe number is; conversely, the smaller the refractive index of the medium, the more slight the dispersion. Therefore, the long-focus characteristic and the optical imaging performance can be realized by combining lenses made of different materials.

The first lens 110 has positive bending force, and the edge thickness of the first lens 110 is ET₁The thickness of the edge of the first lens element 110 is the dimension parallel to the optical axis at the peripheral position of the first lens element 110, and the thickness of the first lens element 110 at the optical axis is CT₁Edge thickness ET of the first lens 110₁A first lens element 1Thickness CT at optical axis 10₁And the focal length f of the optical lens group meets the following conditional expression: 0mm^-1≤ET₁/(CT₁*f)≤0.5mm^-1. Further, to make the edge thickness ET of the first lens 110₁Thickness CT of the first lens element 110 at the optical axis₁And the value range of the limiting relation between the focal lengths f of the optical lens group is more accurate, and the edge thickness ET of the first lens element 110₁Thickness CT of the first lens element 110 at the optical axis₁And the definition relation of the focal length f of the optical lens group is further defined as satisfying: 0.041mm^-1≤ET₁/(CT₁*f)≤0.095mm^-1. The above-mentioned defining relation formula for the edge thickness of the first lens element 110, the thickness of the first lens element 110 at the optical axis and the focal length of the optical lens assembly is defined reasonably, so that the relative size of the thickness of the first lens element 110 can be determined effectively, the molding of the first lens element 110 can be facilitated, the telephoto characteristic can be realized, and the processing and production of the first lens element 110 are facilitated.

The seventh lens 170 has a bending force, and the thickness of the seventh lens 170 at the optical axis is CT₇Edge thickness ET of seventh lens 170₇The thickness CT of the seventh lens element 170 at the optical axis₇And the focal length f of the optical lens group meets the following conditional expression: 0mm^-1≤ET₇/(CT₇*f)≤0.5mm^-1. Further, to make the edge thickness ET of the seventh lens 170₇The thickness CT of the seventh lens element 170 at the optical axis₇The value range of the limiting relation between the focal lengths f of the optical lens group is more accurate, and the edge thickness ET of the seventh lens element 170₇The thickness CT of the seventh lens element 170 at the optical axis₇And the definition relation between the focal lengths f of the optical lens group is further defined as satisfying: 0.057mm^-1≤ET₇/(CT₇*f)≤0.125mm^-1. The above reasonable definition of the relationship among the edge thickness of the seventh lens element 170, the thickness of the seventh lens element 170 at the optical axis and the focal length of the optical lens assembly can effectively determine the relative size of the thickness of the seventh lens element 170, which is beneficial to the formation of the seventh lens element 170, and the realization of the telephoto characteristic, and is convenient for the processing and production of the seventh lens element 170.

In consideration of improving the imaging quality of the whole camera lens, the entrance pupil diameter of the optical lens group is EPD, and the entrance pupil diameter EPD of the optical lens group and the focal length f of the optical lens group satisfy the following conditional expressions: EPD/f is more than or equal to 0 and less than or equal to 1. Further, in order to make the value range of the limiting relation between the entrance pupil diameter EPD of the optical lens group and the focal length f of the optical lens group more accurate, the limiting relation between the entrance pupil diameter EPD of the optical lens group and the focal length f of the optical lens group is further limited to satisfy: EPD/f is more than or equal to 0.352 and less than or equal to 0.513. The relation between the entrance pupil diameter of the optical lens group and the focal length of the optical lens group is reasonably limited, a larger entrance pupil can be provided, the aperture can be enlarged, the imaging quality can be improved, the service time and the space of the carrier can be enlarged, the light flux amount and the image plane can be balanced and moved backwards, and the large aperture and the long-focus characteristic of the optical lens group can be realized.

The third lens element 130 has a bending force on the fourth lens element 140, and the distance from the projection of the effective area edge of the object-side surface of the third lens element on the optical axis to the intersection of the object-side surface of the third lens element and the optical axis is SAG3₂The air space between the third lens element 130 and the fourth lens element 140 at the paraxial region is CT₃₄The distance SAG3 projected on the optical axis of the effective zone edge of the object side surface of the third lens to the intersection point of the object side surface of the third lens and the optical axis₂Air space CT at paraxial region with the third lens element 130 and the fourth lens element 140₃₄The following conditional expressions are satisfied: 0 ≦ SAG3₂∣/CT₃₄Less than or equal to 1. Further, a distance SAG3 for projection of effective zone edge of object side surface of the third lens on optical axis to object side surface of the third lens at optical axis intersection point₂Air space CT at paraxial region with the third lens element 130 and the fourth lens element 140₃₄The value range of the limiting relation is more accurate, and the distance SAG3 from the projection of the effective zone edge of the object side surface of the third lens on the optical axis to the intersection point of the object side surface of the third lens and the optical axis₂Air space CT at paraxial region with the third lens element 130 and the fourth lens element 140₃₄The defined relationship therebetween is further defined to satisfy: 0.023 ≦ SAG3₂∣/CT₃₄Less than or equal to 0.434. The above edge of the effective region to the object side surface of the third lens is on the optical axisThe distance projected to the object-side surface of the third lens element at the intersection of the optical axes and the air space between the third lens element 130 and the fourth lens element 140 at the paraxial region are defined reasonably, and by reasonable arrangement of the optical structure, the direction change of light entering the system can be reduced, which is helpful for reducing the intensity of stray light, reducing the sensitivity of the system, and improving the yield of the third lens element 130.

To facilitate the production and processing of the fourth lens 140, the effective zone edge of the object-side surface of the fourth lens is projected on the optical axis to the intersection point of the optical axis and the object-side surface of the fourth lens, and the distance is SAG4₁The air interval between the third lens element 130 and the fourth lens element 140 at the optical axis is CT₃₄The projection of the effective zone edge of the object side surface of the fourth lens on the optical axis to the distance SAG4 of the intersection point of the object side surface of the fourth lens and the optical axis₁And an air space CT between the third lens 130 and the fourth lens 140 at the optical axis₃₄The following conditional expressions are satisfied: 0 ≦ SAG4₁∣/CT₃₄Less than or equal to 1. Further, a distance SAG4 for projection of effective zone edge of object side surface of the fourth lens on optical axis to object side surface of the fourth lens at optical axis intersection point₁And an air space CT between the third lens 130 and the fourth lens 140 at the optical axis₃₄The value range of the limiting relation is more accurate, and the projection of the effective area edge of the object side surface of the fourth lens on the optical axis to the distance SAG4 of the intersection point of the object side surface of the fourth lens and the optical axis₁And an air space CT between the third lens 130 and the fourth lens 140 at the optical axis₃₄The defined relationship therebetween is further defined to satisfy: |. SAG4 ≦ 0.239₁∣/CT₃₄Less than or equal to 0.724. The distance between the effective area edge of the object side surface of the fourth lens projected on the optical axis to the object side surface of the fourth lens at the intersection of the optical axis and the air space relationship between the third lens 130 and the fourth lens 140 at the optical axis are reasonably limited, and by reasonable layout of the optical structure, the direction change of light rays entering the system can be slowed down, thereby being beneficial to reducing the intensity of ghost images, reducing the sensitivity of the system and improving the yield of the fourth lens 140.

In order to further miniaturize the camera head, half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical lens group is ImgH, and the distance TTL from the object side surface S1 of the first lens element to the imaging surface S17 of the system at the optical axis and half of the diagonal length of the effective pixel area on the image surface are ImgH satisfy the following conditional expressions: TTL |. ImgH is more than or equal to 2 and less than or equal to 3. Further, in order to make the range of the limiting relation between the distance TTL from the object-side surface S1 of the first lens element to the imaging surface S17 of the system at the optical axis and the half ImgH of the diagonal length of the effective pixel area on the image plane more accurate, the limiting relation between the distance TTL from the object-side surface S1 of the first lens element to the imaging surface S17 of the system at the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical lens group is further defined to satisfy: TTL | -ImgH is greater than or equal to 2.156 and less than or equal to 2.465. The above relationship between the TTL from the object-side surface S1 of the first lens element to the image plane S17 of the system at the optical axis and ImgH, which is half the length of the diagonal line of the effective pixel area on the image plane S17 of the optical lens assembly, is defined reasonably, which can ensure high pixel imaging quality of the system and control the total length of the optical lens assembly, thereby minimizing the volume of the camera head composed of the optical lens assembly.

The refractive power of the above lens element may be the refractive power of the lens element at the optical axis. The object side surface of the above lens is a surface of the lens facing the object side. The image side surface of the lens is a surface of the lens facing the image plane. The positive curvature radius of the upper surface at the paraxial region indicates that the surface is convex toward the object plane, and the negative curvature radius of the upper surface at the paraxial region indicates that the surface is convex toward the image plane.

In order to correct system aberration and improve system imaging quality, at least one of a plurality of object side surfaces of the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160 and the seventh lens 170 and a plurality of image side surfaces of the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160 and the seventh lens 170 is an aspheric surface. For example, the object-side surface S11 of the sixth lens element may be aspheric, and the image-side surface S12 of the sixth lens element may also be aspheric. The above surface being an aspherical surface may be that the entire surface of the lens is an aspherical surface. The surface is an aspheric surface, or part of the surface is an aspheric surface; for example, a portion near the optical axis may be aspherical.

In order to reduce the production cost, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 may be made of a plastic material. Of course, in order to improve the imaging quality, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 may be partially or entirely made of a glass material.

In order to reduce stray light and improve the imaging effect, the optical lens assembly may further include a stop 180. The stop 180 may be an aperture stop 180 and/or a field stop 180. The stop 180 may be located at the image side surface S2 of the first lens. For example, the stop 180 may also be located: between the object-side surface S1 of the first lens element and the object plane, between the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, between the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, between the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, between the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, between the image-side surface S10 of the fifth lens element and the object-side surface S11 of the sixth lens element, between the image-side surface S12 of the sixth lens element and the object-side surface S13 of the seventh lens element, or between the image-side surface S14 of the seventh lens element and the image plane. In order to reduce the processing cost, the stop 180 may be disposed on any one of the object-side surface S1 of the first lens, the object-side surface S3 of the second lens, the object-side surface S5 of the third lens, the object-side surface S7 of the fourth lens, the object-side surface S9 of the fifth lens, the object-side surface S11 of the sixth lens, the object-side surface S13 of the seventh lens, the image-side surface S2 of the first lens, the image-side surface S4 of the second lens, the image-side surface S6 of the third lens, the image-side surface S8 of the fourth lens, the image-side surface S10 of the fifth lens, the image-side surface S12 of the sixth lens, and the image-side surface S14 of the seventh lens.

To filter infrared rays, the optical lens assembly may further include an infrared filter 200 located between the image-side surface S14 and the image plane S17 of the seventh lens element, wherein the infrared filter 200 includes a first surface S15 close to the object side and a second surface S16 close to the image side.

To protect the respective lenses, the optical lens group may further include a protective glass located between the image plane side S14 and the image plane S17 of the seventh lens. When the optical lens assembly includes both the infrared filter 200 and the protective glass, the infrared filter 200 may be located on a side close to the seventh lens element 170, and the protective glass may be located on a side close to the image plane S17.

In the present embodiment, by configuring the first lens element 110 to have positive bending power, and the object-side surface of the first lens element 110 near the optical axis is convex, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 each have bending power, and some dimensions of the seventh lens element 170 are defined, the long focus characteristic of the optical lens group can be balanced, the thickness of the optical pick-up lens can be reduced, the maximum effective diameter of the image side surface S14 of the seventh lens and the edge thickness of the seventh lens 170 are limited, the maximum diameter of the optical lens assembly is reduced while the molding yield of the seventh lens element 170 is ensured, which is beneficial to miniaturizing and thinning the entire optical lens assembly, therefore, the assembly difficulty of the whole lens is reduced, the lens and other parts used in cooperation with the lens are convenient to process by workers, and the phenomenon of poor imaging performance after the plurality of lenses are assembled is reduced. The ratio of the distance from the object-side surface S1 of the first lens element of the optical lens assembly to the image plane S17 of the system at the optical axis to the entrance pupil diameter of the optical lens assembly is limited, so that a larger entrance pupil can be provided, the aperture can be enlarged, the imaging quality can be improved, the service time and space of the carrier can be enlarged, the total length of the optical lens assembly can be reduced, the light incident amount can be increased, the related data of the first lens element 110 and the seventh lens element 170 can be limited, the optical lens assembly can be conveniently assembled with other components of the lens, and the thickness of the whole optical lens assembly can be reduced to make the whole lens more light and thin.

The optical lens group for imaging 100 will be described in detail with reference to specific parameters.

Example one

Referring to fig. 1, the optical lens assembly for imaging in the embodiment of the present application includes a stop 180 (attached to an object-side surface S1 of the first lens), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an infrared filter 200, which are sequentially disposed along an optical axis from an object plane to an image plane of the entire optical system.

The first lens element 110 has positive refractive power, and the object-side surface of the first lens element 110 at a paraxial region thereof is convex, and the image-side surface of the first lens element 110 at a paraxial region thereof is concave. The object-side surface of the first lens element 110 at the circumference is convex, and the image-side surface of the first lens element 110 at the circumference is concave.

The second lens element 120 has positive refractive power, and an object-side surface of the second lens element 120 at a paraxial region thereof is convex, and an image-side surface of the second lens element 120 at a paraxial region thereof is convex. The object-side surface of the second lens element 120 at the circumference is convex, and the image-side surface of the second lens element 120 at the circumference is convex.

The third lens element 130 has negative refractive power, and an object-side surface of the third lens element 130 at a paraxial region thereof is convex, and an image-side surface of the third lens element 130 at a paraxial region thereof is concave. The object-side surface of the third lens element 130 at the circumference is convex, and the image-side surface of the third lens element 130 at the circumference is concave.

The fourth lens element 140 has negative bending power, the object-side surface of the fourth lens element 140 at a paraxial region is concave, the image-side surface of the fourth lens element 140 at a paraxial region is convex, the object-side surface of the fourth lens element 140 at a circumference is concave, and the image-side surface of the fourth lens element 140 at a circumference is convex.

The fifth lens element 150 has positive refractive power, the object-side surface of the fifth lens element 150 at a paraxial region is concave, the image-side surface of the fifth lens element 150 at a paraxial region is convex, the object-side surface of the fifth lens element 150 at a circumference is concave, and the image-side surface of the fifth lens element 150 at a circumference is convex.

The sixth lens element 160 with negative refractive power has a concave object-side surface at a paraxial region of the sixth lens element 160, a concave image-side surface at a paraxial region of the sixth lens element 160, a concave object-side surface at a circumference of the sixth lens element 160, and a convex image-side surface at a circumference of the sixth lens element 160.

The seventh lens element 170 has negative refractive power, the object-side surface of the seventh lens element 170 near the optical axis is concave, the image-side surface of the seventh lens element 170 near the optical axis is concave, the object-side surface of the seventh lens element 170 at the circumference is concave, and the image-side surface of the seventh lens element 170 at the circumference is convex.

The surfaces of the lenses at the position close to the optical axis refer to the surfaces of the imaging area of the whole optical lens, and the surfaces of the lenses at the circumference refer to the surfaces of the non-imaging area of the whole optical lens.

In the embodiment of the present application, light with a wavelength of 587.6000nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 1, f in table 1 is a focal length of the optical lens assembly, FNO represents an aperture value, and FOV represents a field angle of the optical lens assembly in a diagonal direction; the units of focal length, radius of curvature and thickness are in millimeters.

TABLE 1

Maximum effective diameter Y7 of image side surface S14 of seventh lens₂2.670, edge thickness ET of seventh lens 170₇As can be seen from the above table at 0.330, the distance TTL between the object-side surface S1 of the first lens element and the image plane S17 of the system at the optical axis is 7.042, and the focal length f of the optical lens assembly is 7.640, so that the image-side surface S14 of the seventh lens element has the largest effective diameter Y7₂Edge thickness ET of the seventh lens element 170₇The distance TTL between the object-side surface S1 of the first lens element and the image plane S17 of the system at the optical axis, the focal length f of the optical lens assembly, and the relationship therebetween: (Y7₂*TTL)/(ET₇*f)＝7.453。

As shown in the above table, the distance TTL from the object-side surface S1 of the first lens element to the image plane S17 of the system at the optical axis is 7.042, and the relationship between the entrance pupil diameter EPD of the optical lens assembly and the distance TTL from the object-side surface S1 of the first lens element to the image plane S17 of the system at the optical axis is: TTL/EPD 1.989.

The object side surface S1 of the first lens is in the effective diameterMost bent angle AL1S₁49.000, the most bending angle AL2S in the effective radius of the object side of the second lens 120₁16.256, the focal length f of the optical lens group is 7.640, and the most bending angle AL1S in the effective diameter of the object side surface S1 of the first lens element₁The most bending angle AL2S in the effective diameter of the object side surface S3 of the second lens₁And the focal length f of the optical lens group meets the following conditional expression: | AL1S₁∣+∣AL2S₁∣)/f＝8.541deg/mm。

The average value of the d-line abbe numbers of the first lens element 110 to the seventh lens element 170 is MVd-45.021, the focal length f of the optical lens assembly is 7.640, and the average value of the d-line abbe numbers of the first lens element 110 to the seventh lens element 170 is the relationship between MVd and the focal length f of the optical lens assembly: MVd/f 5.893mm^-1。

Edge thickness ET of the first lens 110₁0.350, thickness CT of the first lens 110 at the optical axis₁1.106, the edge thickness ET of the first lens 110₁Thickness CT of the first lens element 110 at the optical axis₁And the relation between the focal lengths f of the optical lens group is as follows: ET₁/(CT₁*f)＝0.041mm^-1。

The thickness of the seventh lens element 170 at the optical axis is CT₇0.737, edge thickness ET of seventh lens 170₇＝0.330，ET₇、 CT₇And f satisfies the following conditional expressions: ET₇/(CT₇*f)＝0.059mm^-1。

The entrance pupil diameter EPD of the optical lens assembly is 3.540, and the focal length f of the optical lens assembly is 7.640, and the relationship between EPD and f is as follows: EPD/f is 0.463.

The distance SAG3 of the projection of the effective zone edge of the object side surface of the third lens on the optical axis to the intersection point of the object side surface of the third lens and the optical axis₂0.030 air space CT of the third lens 130 and the fourth lens 140 at the optical axis₃₄＝0.433，SAG3₂And CT₃₄The relation between: | SAG3₂∣/CT₃₄＝0.070。

The projection of the effective zone edge of the object side surface of the fourth lens on the optical axis to the distance SAG4 of the intersection point of the object side surface of the fourth lens and the optical axis_1＝0.150, air space CT of the third lens 130 and the fourth lens 140 at the optical axis₃₄＝0.433，SAG4₁And CT₃₄The relation between: | SAG4₁∣/CT₃₄＝0.346。

Half of the diagonal length of the effective pixel region on the image plane S17 of the optical lens group is ImgH 3.266, the distance TTL between the object-side surface S1 of the first lens element and the image plane S17 of the system at the optical axis is 7.042, and the relation between TTL and ImgH is: TTL | ImgH ═ 2.156.

The surfaces of the lenses of the optical lens group may be aspherical surfaces for which the aspherical equation for the aspherical surface is:

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, and a12 respectively denote aspheric coefficients of orders 4, 6, 8, 10, and 12. In the first embodiment of the present application, the surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the object side surface are all aspheric surfaces, the surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the image side surface are all aspheric surfaces, and the conic constant K and the aspheric coefficient corresponding to the aspheric surface corresponding to each lens element are shown in table 2:

TABLE 2

Fig. 2 is a light spherical aberration curve chart of the embodiments of the present application at wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm, and it can be seen from fig. 2 that the spherical aberrations corresponding to the wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm are all within 1.0000 mm, which indicates that the imaging quality of the embodiments of the present application is better.

Fig. 3 is a graph of astigmatism of an embodiment of the present application, and it can be seen from fig. 3 that the field curvature is within 3.2700 mm at a reference wavelength of 587.5618nm, which is better compensated.

Fig. 4 is a distortion graph of the embodiment of the present application, and it can be seen from fig. 4 that distortion is well corrected in the case of the reference wavelength of 587.5618 nm.

Example two

Referring to fig. 5, the optical lens group for imaging according to the embodiment of the present application includes a stop 180 (attached to an object-side surface S1 of the first lens), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an infrared filter 200, which are sequentially disposed along an optical axis from an object plane to an image plane of the entire optical system.

The second lens element 120 has positive refractive power, and an object-side surface of the second lens element 120 at a paraxial region thereof is convex, and an image-side surface of the second lens element 120 at a paraxial region thereof is convex. The object-side surface of the second lens element 120 at the circumference is convex, and the image-side surface of the second lens element 120 at the circumference is concave.

The fourth lens element 140 has positive refractive power, the object-side surface of the fourth lens element 140 at a paraxial region is concave, the image-side surface of the fourth lens element 140 at a paraxial region is convex, the object-side surface of the fourth lens element 140 at a circumference is concave, and the image-side surface of the fourth lens element 140 at a circumference is convex.

The fifth lens element 150 has negative refractive power, the object-side surface of the fifth lens element 150 at a paraxial region is concave, the image-side surface of the fifth lens element 150 at a paraxial region is convex, the object-side surface of the fifth lens element 150 at a circumference is concave, and the image-side surface of the fifth lens element 150 at a circumference is convex.

The sixth lens element 160 with negative refractive power has a convex object-side surface at a paraxial region of the sixth lens element 160, a concave image-side surface at a paraxial region of the sixth lens element 160, a concave object-side surface at a circumference of the sixth lens element 160, and a convex image-side surface at a circumference of the sixth lens element 160.

The seventh lens element 170 has positive refractive power, the object-side surface of the seventh lens element 170 at a paraxial region is convex, the image-side surface of the seventh lens element 170 at a paraxial region is concave, the object-side surface of the seventh lens element 170 at a circumference is concave, and the image-side surface of the seventh lens element 170 at a circumference is convex.

In the embodiment of the present application, light with a wavelength of 587.6000nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 3, f in table 3 is a focal length of the optical lens assembly, FNO represents an aperture value, and FOV represents a field angle of the optical lens assembly in a diagonal direction; the units of focal length, radius of curvature and thickness are in millimeters.

TABLE 3

It should be noted that the parameter "Y7" is used herein₂、ET₇、TTL、f、EPD、AL1S₁、AL2S₁、MVd、ET₁、 CT₁、CT₇、SAG3₂、SAG4₁、CT₃₄The meaning of the parameters such as ImgH and the like is the same as that in the first embodiment, and the calculation formula is also the same, and has been introduced in the first embodiment, which is not described herein again, and different values are substituted for calculation to obtain the corresponding result.

In the second embodiment of the present application, the surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the object side surface are all aspheric surfaces, the surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the image side surface are all aspheric surfaces, and the conic constant K and the aspheric coefficient corresponding to the aspheric surface corresponding to each lens element are shown in table 4:

TABLE 4

Fig. 6 is a light spherical aberration curve chart of the embodiments of the present application at wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm, and it can be seen from fig. 6 that the spherical aberrations corresponding to the wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm are all within 1.0000 mm, which indicates that the imaging quality of the embodiments of the present application is better.

Fig. 7 is a graph of astigmatism of an embodiment of the present application, and it can be seen from fig. 7 that the field curvature is within 2.4300 mm and is well compensated for in the case of a reference wavelength of 587.5618 nm.

Fig. 8 is a distortion graph of the embodiment of the present application, and it can be seen from fig. 8 that distortion is well corrected in the case of the reference wavelength of 587.5618 nm.

EXAMPLE III

Referring to fig. 9, the optical lens assembly for imaging in the embodiment of the present application includes a stop 180 (attached to an object-side surface S1 of the first lens element), a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, a seventh lens element 170, and an infrared filter 200, which are sequentially disposed along an optical axis from an object plane to an image plane of the entire optical lens assembly.

The second lens element 120 has positive refractive power, and the object-side surface of the second lens element 120 at a paraxial region thereof is convex, and the image-side surface of the second lens element 120 at a paraxial region thereof is concave. The object-side surface of the second lens element 120 at the circumference is convex, and the image-side surface of the second lens element 120 at the circumference is convex.

The third lens element 130 has negative refractive power, and an object-side surface of the third lens element 130 at a paraxial region thereof is concave, and an image-side surface of the third lens element 130 at a paraxial region thereof is convex. The object-side surface of the third lens element 130 at the circumference is concave, and the image-side surface of the third lens element 130 at the circumference is convex.

The sixth lens element 160 with positive refractive power has a concave object-side surface near the optical axis of the sixth lens element 160, a convex image-side surface near the optical axis of the sixth lens element 160, a concave object-side surface around the circumference of the sixth lens element 160, and a convex image-side surface around the circumference of the sixth lens element 160.

The seventh lens element 170 has negative refractive power, the object-side surface of the seventh lens element 170 at a paraxial region is concave, the image-side surface of the seventh lens element 170 at a paraxial region is convex, the object-side surface of the seventh lens element 170 at a circumference is concave, and the image-side surface of the seventh lens element 170 at a circumference is convex.

In the embodiment of the present application, light with a wavelength of 587.6000nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 5, f in table 5 is a focal length of the optical lens assembly, FNO represents an aperture value, and FOV represents a field angle of the optical lens assembly in a diagonal direction; the units of focal length, radius of curvature and thickness are in millimeters.

TABLE 5

In the third embodiment of the present application, the surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the object side surface are all aspheric surfaces, the surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the image side surface are all aspheric surfaces, and the conic constant K and the aspheric coefficient corresponding to the aspheric surface corresponding to each lens element are shown in table 6:

TABLE 6

Fig. 10 is a graph of spherical aberration curves of the light with wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from fig. 10 that the spherical aberrations corresponding to the wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm are all within 1.0000 mm, which indicates that the imaging quality of the embodiment of the present application is better.

Fig. 11 is a graph of astigmatism of an embodiment of the present application, and it can be seen from fig. 11 that the field curvature is within 3.2700 mm and is well compensated for in the case of a reference wavelength of 587.5618 nm.

Fig. 12 is a distortion graph of the embodiment of the present application, and it can be seen from fig. 12 that distortion is also well corrected in the case of the reference wavelength of 587.5618 nm.

Example four

Referring to fig. 13, the optical lens assembly for imaging in the embodiment of the present application includes a stop 180 (attached to an object-side surface S1 of the first lens), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an infrared filter 200, which are sequentially disposed along an optical axis from an object plane to an image plane of the entire optical system.

The third lens element 130 has negative refractive power, and an object-side surface of the third lens element 130 at a paraxial region thereof is concave, and an image-side surface of the third lens element 130 at a paraxial region thereof is concave. The object-side surface of the third lens element 130 at the circumference is convex, and the image-side surface of the third lens element 130 at the circumference is concave.

The fourth lens element 140 has negative bending power, the object-side surface of the fourth lens element 140 at a paraxial region thereof is convex, the image-side surface of the fourth lens element 140 at a paraxial region thereof is concave, the object-side surface of the fourth lens element 140 at a circumference thereof is concave, and the image-side surface of the fourth lens element 140 at a circumference thereof is convex.

The sixth lens element 160 with negative refractive power has a concave object-side surface at a paraxial region of the sixth lens element 160, a convex image-side surface at a paraxial region of the sixth lens element 160, a concave object-side surface at a circumference of the sixth lens element 160, and a convex image-side surface at a circumference of the sixth lens element 160.

The seventh lens element 170 has negative refractive power, the object-side surface of the seventh lens element 170 at a paraxial region is convex, the image-side surface of the seventh lens element 170 at a paraxial region is concave, the object-side surface of the seventh lens element 170 at a circumference is concave, and the image-side surface of the seventh lens element 170 at a circumference is convex.

In the embodiment of the present application, light with a wavelength of 587.60000nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 7, f in table 7 is a focal length of the optical lens assembly, FNO represents an aperture value, and FOV represents a field angle of the optical lens assembly in a diagonal direction; the units of focal length, radius of curvature and thickness are in millimeters.

TABLE 7

In the fourth embodiment of the present invention, the surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the object side surface are all aspheric surfaces, the surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the image side surface are all aspheric surfaces, and the conic constant K and the aspheric coefficient corresponding to the aspheric surface corresponding to each lens element are shown in table 8:

TABLE 8

Fig. 14 is a graph of spherical aberration curves of the light with wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from fig. 14 that the spherical aberrations corresponding to the wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm are all within 1.0000 mm, which indicates that the imaging quality of the embodiment of the present application is better.

Fig. 15 is a graph of astigmatism of the embodiment of the present application, and it can be seen from fig. 15 that the field curvature is within 2.4300 mm and is well compensated for in the case of the reference wavelength of 587.5618 nm.

Fig. 16 is a distortion graph of the embodiment of the present application, and it can be seen from fig. 16 that distortion is also well corrected in the case of the reference wavelength of 587.5618 nm.

EXAMPLE five

Referring to fig. 17, a schematic structural diagram of an optical lens assembly for imaging according to an embodiment of the present application includes a stop 180 (attached to an object-side surface S1 of a first lens), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an infrared filter 200, which are sequentially disposed along an optical axis from an object plane to an image plane of an entire optical system.

The first lens element 110 has positive refractive power, and the object-side surface of the first lens element 110 at a paraxial region thereof is convex, and the image-side surface of the first lens element 110 at a paraxial region thereof is convex. The object-side surface of the first lens element 110 at the circumference is convex, and the image-side surface of the first lens element 110 at the circumference is convex.

The second lens element 120 has negative refractive power, and the object-side surface of the second lens element 120 at a paraxial region thereof is concave, and the image-side surface of the second lens element 120 at a paraxial region thereof is concave. The object-side surface of the second lens element 120 at the circumference is concave, and the image-side surface of the second lens element 120 at the circumference is convex.

The fourth lens element 140 has positive refractive power, the object-side surface of the fourth lens element 140 at a paraxial region thereof is convex, the image-side surface of the fourth lens element 140 at a paraxial region thereof is concave, the object-side surface of the fourth lens element 140 at a circumference thereof is concave, and the image-side surface of the fourth lens element 140 at a circumference thereof is convex.

The fifth lens element 150 has negative refractive power, the object-side surface of the fifth lens element 150 at a paraxial region thereof is convex, the image-side surface of the fifth lens element 150 at a paraxial region thereof is concave, the object-side surface of the fifth lens element 150 at a circumference thereof is convex, and the image-side surface of the fifth lens element 150 at a circumference thereof is concave.

In the embodiment of the present application, light with a wavelength of 587.6000nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 9, f in table 9 is a focal length of the optical lens assembly, FNO represents an aperture value, and FOV represents a field angle of the optical lens assembly in a diagonal direction; the units of focal length, radius of curvature and thickness are in millimeters.

TABLE 9

It should be noted that the parameter "Y7" is used herein₂、ET₇、TTL、f、EPD、AL1S₁、AL2S₁、MVd、ET₁、 CT₁、CT₇、SAG3₂、SAG4₁、CT₃₄The meanings of the parameters such as ImgH are the same as those in the first embodiment, and the calculation formula is also the same, and has been introduced in the first embodiment, and will not be described herein again, withAnd (4) calculating by using different numerical values to obtain corresponding results.

In the fifth embodiment of the present application, the surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the object side surface are all aspheric surfaces, the surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the image side surface are all aspheric surfaces, and the conic constant K and the aspheric coefficient corresponding to the aspheric surfaces corresponding to the respective lens elements are shown in table 10:

watch 10

Fig. 18 is a graph of spherical aberration curves of light rays with wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from fig. 18 that the spherical aberrations corresponding to the wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm are all within 1.0000 mm, which indicates that the imaging quality of the embodiment of the present application is better.

Fig. 19 is a graph of astigmatism of the embodiment of the present application, and it can be seen from fig. 19 that the field curvature is within 2.4300 mm and is well compensated for in the case of the reference wavelength of 587.5618 nm.

Fig. 20 is a distortion graph of the embodiment of the present application, and it can be seen from fig. 20 that distortion is also well corrected in the case where the reference wavelength is 587.5618 nm.

EXAMPLE six

Referring to fig. 21, a schematic structural diagram of an optical lens group for imaging according to an embodiment of the present application includes a stop 180 (attached to an object-side surface S1 of a first lens), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an infrared filter 200, which are sequentially disposed along an optical axis from an object plane to an image plane of an entire optical system.

In the embodiment of the present application, light with a wavelength of 587.6000nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 11, f in table 11 is a focal length of the optical lens assembly, FNO represents an aperture value, and FOV represents a field angle of the optical lens assembly in a diagonal direction; the units of focal length, radius of curvature and thickness are in millimeters.

TABLE 11

In sixth embodiment of the present invention, surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the object side surface are all aspheric surfaces, surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the image side surface are all aspheric surfaces, and a conic constant K and an aspheric coefficient corresponding to the aspheric surfaces of the aspheric surfaces corresponding to the respective lens elements are shown in table 12:

TABLE 12

Fig. 22 is a graph of spherical aberration curves of the light with wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from fig. 22 that the spherical aberrations corresponding to the wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm are all within 1.0000 mm, which indicates that the imaging quality of the embodiment of the present application is better.

Fig. 23 is a graph of astigmatism of the embodiment of the present application, and it can be seen from fig. 23 that the field curvature is within 3.2700 mm and is well compensated for in the case of the reference wavelength of 587.5618 nm.

Fig. 24 is a distortion graph of the embodiment of the present application, and it can be seen from fig. 24 that distortion is also well corrected in the case where the reference wavelength is 587.5618 nm.

EXAMPLE seven

Referring to fig. 25, a schematic structural diagram of an optical lens group for imaging according to an embodiment of the present application includes a stop 180 (attached to an object-side surface S1 of a first lens), a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an infrared filter 200, which are sequentially disposed along an optical axis from an object plane to an image plane of an entire optical system.

The second lens element 120 has negative refractive power, and the object-side surface of the second lens element 120 at a paraxial region thereof is convex, and the image-side surface of the second lens element 120 at a paraxial region thereof is concave. The object-side surface of the second lens element 120 at the circumference is convex, and the image-side surface of the second lens element 120 at the circumference is convex.

The third lens element 130 has positive refractive power, and an object-side surface of the third lens element 130 at a paraxial region thereof is convex, and an image-side surface of the third lens element 130 at a paraxial region thereof is concave. The object-side surface of the third lens element 130 at the circumference is convex, and the image-side surface of the third lens element 130 at the circumference is concave.

The seventh lens element 170 has negative refractive power, the object-side surface of the seventh lens element 170 at a paraxial region is concave, the image-side surface of the seventh lens element 170 at a paraxial region is convex, the object-side surface of the seventh lens element 170 at a circumference is convex, and the image-side surface of the seventh lens element 170 at a circumference is convex.

In the embodiment of the present application, light with a wavelength of 587.6000nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 13, f in table 13 is a focal length of the optical lens assembly, FNO represents an aperture value, and FNO represents a field angle of the optical lens assembly in a diagonal direction; the units of focal length, radius of curvature and thickness are in millimeters.

Watch 13

In the seventh embodiment of the present application, the surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the object side surface are all aspheric surfaces, the surfaces of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 facing the image side surface are all aspheric surfaces, and the conic constant K and the aspheric coefficient corresponding to the aspheric surfaces corresponding to the respective lens elements are shown in table 14:

TABLE 14

Fig. 26 is a light spherical aberration curve chart of the embodiments of the present application at wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm, and it can be seen from fig. 26 that the spherical aberrations corresponding to the wavelengths of 650.0000nm, 610.0000nm, 587.5618nm, 510.0000nm and 470.0000nm are all within 1.0000 mm, which indicates that the imaging quality of the embodiments of the present application is better.

Fig. 27 is a graph of astigmatism of the embodiment of the present application, and it can be seen from fig. 27 that the field curvature is within 3.2700 mm and is well compensated for in the case of the reference wavelength of 587.5618 nm.

Fig. 28 is a distortion graph of the embodiment of the present application, and it can be seen from fig. 28 that distortion is well corrected in the case where the reference wavelength is 587.5618 nm.

According to a second aspect of the present application, a camera module is provided, which includes the above optical lens group and image sensor; the optical lens group is used for receiving the optical signal of the shot object and projecting the optical signal to the image sensor; the image sensor is used for converting the optical signal into an image signal, which is not described herein. The camera module with the optical lens group has the advantages that the focal power is correspondingly optimized and set through reasonable configuration of the seven optical lenses, the long-focus characteristic of the optical lens group can be balanced, and meanwhile, the miniaturization characteristic of the camera module is guaranteed through reasonable control of the air interval between the lenses and the thickness of each lens.

According to a third aspect of the present application, a terminal is provided, which includes the above-mentioned camera module. The electronic device can be a mobile phone, a computer, a tablet, a monitor and the like. The electronic equipment with the camera module has the advantages that the focal power is correspondingly optimized and set through reasonable configuration of the seven optical lenses, the long-focus characteristic of an optical system can be balanced, and meanwhile, the electronic equipment is light and thin through reasonable control of air intervals among the lenses.

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", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of 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 for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations.

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 group is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object plane to an image plane along an optical axis; wherein,

the first lens element has positive bending force, and the object-side surface at the paraxial region is convex;

the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens each have a bending force;

wherein a maximum effective diameter of an image-side surface of the seventh lens element is Y7₂The distance from the object side surface of the first lens to the imaging surface of the system at the optical axis is TTL, and the edge thickness of the seventh lens is ET₇The focal length of the optical lens group is f, Y7₂，TTL，ET₇And f satisfies the following conditional expressions:

3≤(Y7₂*TTL)/(ET₇*f)≤8。

2. the optical lens assembly of claim 1,

the entrance pupil diameter of the optical lens group is EPD, and TTL and EPD satisfy the following conditional expressions:

1.5≤TTL/EPD≤3。

3. the optical lens assembly of claim 1,

the most bending angle in the effective diameter of the object side surface of the first lens is AL1S₁The most bending angle in the effective diameter of the object side surface of the second lens is AL2S₁，AL1S₁、AL2S₁And f satisfies the following conditional expressions:

8deg/mm≤(∣AL1S₁∣+∣AL2S₁∣)/f≤12deg/mm。

4. the optical lens assembly of claim 1,

the average value of d-line abbe numbers of the first lens to the seventh lens is MVd, and the MVd and f satisfy the following conditional expressions:

5mm^-1≤MVd/f≤10mm^-1。

5. the optical lens assembly of claim 1,

the edge thickness of the first lens is ET₁The thickness of the first lens at the optical axis is CT₁，ET₁、CT₁And f satisfies the following conditional expressions:

0mm^-1≤ET₁/(CT₁*f)≤0.5mm^-1。

6. the optical lens assembly of claim 1,

the thickness of the seventh lens at the optical axis is CT₇，ET₇、CT₇And f satisfies the following conditional expressions:

0mm^-1≤ET₇/(CT₇*f)≤0.5mm^-1。

7. the optical lens assembly of claim 1,

the entrance pupil diameter of the optical lens group is EPD, and the EPD and the f satisfy the following conditional expression:

0≤EPD/f≤1。

8. the optical lens assembly of claim 1,

the distance from the projection of the effective area edge of the object side surface of the third lens on the optical axis to the intersection point of the object side surface of the third lens and the optical axis is SAG3₂The air interval between the third lens and the fourth lens on the optical axis is CT₃₄，SAG3₂And CT₃₄The following conditional expressions are satisfied:

0≤∣SAG3₂∣/CT₃₄≤1。

9. the optical lens assembly of claim 1,

the distance from the projection of the effective area edge of the object side surface of the fourth lens on the optical axis to the intersection point of the object side surface of the fourth lens and the optical axis is SAG4₁The air interval between the third lens and the fourth lens on the optical axis is CT₃₄，SAG4₁And CT₃₄The following conditional expressions are satisfied:

0≤∣SAG4₁∣/CT₃₄≤1。

10. the optical lens assembly of claim 1,

half of the length of a diagonal line of an effective pixel area on an imaging surface of the optical lens group is ImgH, and TTL and ImgH satisfy the following conditional expressions:

2≤TTL∣ImgH≤3。

11. a camera module, comprising the optical lens assembly of any one of claims 1-10 and an image sensor;

the optical lens group is used for receiving a light signal of a shot object and projecting the light signal to the image sensor;

the image sensor is used for converting optical signals of a shot object from the optical lens group into image signals.

12. A terminal comprising the camera module of claim 11.