CN112799219B

CN112799219B - Optical lens group, camera module and electronic equipment

Info

Publication number: CN112799219B
Application number: CN202110300037.6A
Authority: CN
Inventors: 邹海荣
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-07-16
Anticipated expiration: 2041-03-22
Also published as: CN112799219A

Abstract

The application discloses an optical lens group, a camera module and electronic equipment, wherein a first lens has positive focal power, and the object side surface of the first lens at a paraxial region is a convex surface; the second lens has focal power, and the object side surface of the second lens is convex at the position close to the optical axis; the third lens has focal power; the fourth lens has focal power, the object side surface of the fourth lens is convex at a paraxial region, and the image side surface of the fourth lens is concave at the paraxial region; the fifth lens element has positive focal power, and has a concave object-side surface and a convex image-side surface at a paraxial region; the sixth lens has positive focal power, and the object side surface of the sixth lens is convex at a position close to the optical axis; the seventh lens element has a negative power, and the image-side surface of the seventh lens element is concave at the paraxial region. The optical lens group composed of seven lens pieces is designed, the distribution of the lens in the space can be reasonably distributed so as to realize the compression of the total length of the lens group, and the design requirements of ultra-thinning and high resolution are further met.

Description

Optical lens group, camera module and electronic equipment

Technical Field

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

Background

With the development and progress of science and technology, portable electronic devices such as smart phones are gradually popularized, people have higher and higher requirements on lenses carried on electronic products, the overall length of the lens group carried on the portable electronic products is limited due to the gradual miniaturization, lightness and thinness of the portable electronic products, and the difficulty of lens design is increased under the condition of ensuring the imaging quality. The photosensitive element of a general camera lens is a charge coupled device or a complementary metal oxide semiconductor sensor, and along with the development of the photosensitive element technology, the photosensitive element gradually develops to the high pixel field, and the pixel size becomes smaller and smaller, so that higher requirements are made on the resolution and miniaturization of the matched camera lens.

Disclosure of Invention

The application provides an optical lens group, module and electronic equipment make a video recording, can make lens reasonable distribution in order to realize the compression of the total length of lens group, and then satisfy the design demand of ultra-thin and high resolution.

According to a first aspect of the present application, there is provided an optical lens assembly including, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein:

the first lens has a positive optical power, the first lens object side surface being convex at a paraxial region;

the second lens has a focal power, the second lens object side surface being convex at a paraxial region;

the third lens has optical power;

the fourth lens element has a focal power, the fourth lens element having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

the fifth lens element has a positive optical power, the fifth lens element having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;

the sixth lens element has a positive optical power, the sixth lens element having a convex object-side surface at a paraxial region;

the seventh lens element has a negative optical power, the seventh lens element has a concave image-side surface at a paraxial region, and the seventh lens element has an object-side surface or an image-side surface comprising at least one inflection point;

the optical lens group meets the following conditional expression: 0.4< Σ ET/TTL < 0.54;

wherein Σ ET is a sum of edge thicknesses of the first lens element to the seventh lens element, and TTL is an axial distance from an object-side surface of the first lens element to an image plane of the optical lens assembly.

Based on the optical lens group provided by the embodiment of the application, at least one inflection point is arranged on the object side surface or the image side surface of the seventh lens element, so that the excessive increase of the incident angle from the edge field to the imaging surface can be inhibited, and the relative illumination of the edge field can not be rapidly reduced; by arranging the seven lenses, the optical lens group has more design freedom degrees, and the resolution ratio of the lens can be improved; by matching the positive and negative focal powers of the lenses from the first lens to the seventh lens and the surface type concave-convex part at the position close to the optical axis, the total length of the optical system is favorably shortened, the miniaturized design is realized, and meanwhile, the light rays are favorably converged on the imaging surface of the optical system better; the relation between the sum Σ ET of the edge thicknesses of the lenses in the first to seventh lens images and the distance TTL on the optical axis from the object-side surface of the first lens element to the image plane of the optical lens assembly is designed to satisfy the conditional expression: 0.4 [ sigma ] ET/TTL <0.54, like this, in order to overcome the longer problem of seven lens total length, seven lens edges closely arrange in this application, edge thickness attenuate, be favorable to the compression of mirror group total length, and when the numerical relation between above two parameters is higher than the upper limit value of above-mentioned conditional expression, can lead to lens thickness to compress inadequately, and when the numerical relation between above two parameters is less than the lower limit value of above-mentioned conditional expression, can lead to the lens limit in the optical mirror group to be thick too thin, the bearing capacity between each lens is not enough when the equipment is arranged, lead to lens assembly shaping difficulty, make the assembly stability of optical mirror group poor, the manufacturability is poor.

According to some embodiments, the optical lens group further satisfies: 2< | (R41+ R42)/(R41-R42) | < 18; wherein R41 is a radius of curvature of the fourth lens object-side surface at the optical axis, and R42 is a radius of curvature of the fourth lens image-side surface at the optical axis.

Based on the above-described embodiment, by designing the relationship between the curvature radius R41 of the fourth lens object-side surface at the optical axis and the curvature radius R42 of the fourth lens image-side surface at the optical axis to satisfy the conditional expression: 2< | (R41+ R42)/(R41-R42) | <18, and the object-side surface of the fourth lens element is convex at the paraxial region and the image-side surface is concave at the paraxial region, so that this aspect is more favorable for compressing the total length of the optical lens assembly.

According to some embodiments, the optical lens group further satisfies: 0.18< Σ T/TTL < 0.3; wherein Σ T is the sum of air gaps on the optical axis of the first lens to the seventh lens.

Based on the above embodiment, the sum Σ T of the air gaps on the optical axis by the first lens to the seventh lens is

The relation between the distance TTL from the object side surface of a lens to the image plane of the optical lens group on the optical axis is designed to satisfy the conditional expression: 0.18< sigma T/TTL <0.3, so that the air gaps among the lenses can be reasonably optimized, the space is compressed, and the ultrathin electronic equipment is more favorably matched, when the numerical relationship between the two parameters is higher than the upper limit value of the conditional expression, the gap gaps are larger, the lens is not uniformly distributed, the total length is not compressed sufficiently under the condition of the same total length, and when the numerical relationship between the two parameters is lower than the lower limit value of the conditional expression, the air gaps among the lenses are smaller, the design freedom of the lenses is poor, the off-axis aberration of the optical lens group is difficult to correct, the imaging quality is reduced, and the ghost risk is increased.

According to some embodiments, the optical lens group further satisfies: 0.7< f1/f < 3.2; wherein f is an effective focal length of the optical lens group, and f1 is a focal length of the first lens element.

Based on the above embodiment, by designing the relationship between the effective focal length f of the optical lens group and the focal length f1 of the first lens element to satisfy the conditional expression: 0.7< f1/f <3.2, so that the field curvature of the optical lens group can be corrected, good imaging quality is ensured, and the effective focal length f is reasonably compressed, which is beneficial to compressing the total length of the optical lens group.

According to some embodiments, at least two of the first lens to the seventh lens have a refractive index n > 1.63.

Based on the above embodiment, by designing the refractive indices n of at least two lenses to satisfy the conditional expression: n is more than 1.63, as the optical lens group is a seven-piece lens, the total length of the lens group is required to be compressed, and the lens needs to have higher refractive index in an extremely short space, so that chromatic aberration can be corrected while the total length of the lens group is fully compressed, and high resolution is ensured.

According to some embodiments, the optical lens group further satisfies: 0.28< EPD/(ImgH × 2) < 0.34; the EPD is the diameter of an entrance pupil of the optical lens group, and the ImgH is half of the length of a diagonal line of an effective photosensitive area on an imaging surface of the optical lens group.

Based on the above embodiment, the relationship between the entrance pupil diameter EPD of the optical lens group and half of the diagonal length ImgH of the effective photosensitive area on the imaging surface of the optical lens group is designed to satisfy the conditional expression: 0.28< EPD/(ImgH 2) <0.34, such that, under the same image height, the larger the entrance pupil diameter of the optical lens assembly, the higher the illumination, the better the imaging quality, and when the numerical relationship between the above two parameters is higher than the upper limit value of the above conditional expression, the entrance pupil diameter of the optical lens assembly is larger, the excessive light enters the optical lens assembly, it is difficult to correct the aberration well, and when the numerical relationship between the above two parameters is lower than the lower limit value of the above conditional expression, the entrance pupil diameter of the optical lens assembly is smaller, the light transmission amount is insufficient, the accuracy in actual image capturing is reduced, and the imaging quality is deteriorated.

According to some embodiments, the optical lens group further satisfies: 2.4< f1/R1< 5.7; wherein f1 is the focal length of the first lens, and R1 is the radius of curvature of the object-side surface of the first lens at the optical axis.

Based on the above-described embodiment, by designing the relationship between the focal length f1 of the first lens and the radius of curvature R1 of the object-side surface of the first lens at the optical axis so as to satisfy the conditional expression: 2.4< f1/R1<5.7, so that the total length of the lens group can be shortened, and simultaneously good imaging quality can be maintained, the first lens provides most positive focal power and mainly controls the effective focal length f of the whole lens, so that the total length of the lens group is further controlled, the object side surface of the first lens faces to the area where a shot object is located, large-angle light rays can enter the optical lens group favorably, the deflection angle of the light rays in the optical lens group is small, the sensitivity is low, and the imaging quality of the lens group can be improved favorably; the first lens provides most positive focal power for focusing and imaging, and the object side surface of the first lens is convex at the paraxial region, so that light can enter the first lens more conveniently.

According to some embodiments, the optical lens group further satisfies: f56/f7> -1.71; wherein f56 is a combined focal length of the fifth lens and the sixth lens, and f7 is a focal length of the seventh lens.

Based on the above-described embodiment, by designing the relationship between the combined focal length f56 of the fifth lens and the sixth lens and the focal length f7 of the seventh lens so as to satisfy the conditional expression: f56/f7> -1.71, so that the fifth lens and the sixth lens together provide positive focal power, cooperate with the first lens to further converge and image light, the seventh lens provides negative focal power to ensure sufficient back focal length, and by reasonably configuring the ratio between the above two parameters, the total length of the optical lens group is more favorably shortened so as to be carried on ultrathin electronic equipment, the fifth lens and the sixth lens provide positive focal power, cooperate with the first lens to further compress the total length of the optical lens group, and when the numerical relationship between the above two parameters exceeds the range of the above conditional expressions, the positive focal power provided by the fifth lens and the sixth lens is slightly smaller, and the total length of the optical lens group is insufficiently compressed.

According to some embodiments, the optical lens group further satisfies: 2.9< D12/D11+ D22/D21+ D32/D31< 3.2; the lens structure comprises a first lens, a second lens, a third lens and a fourth lens, wherein D11 is half of the maximum effective caliber of the object side surface of the first lens, D12 is half of the maximum effective caliber of the image side surface of the first lens, D21 is half of the maximum effective caliber of the object side surface of the second lens, D22 is half of the maximum effective caliber of the image side surface of the second lens, D31 is half of the maximum effective caliber of the object side surface of the third lens, and D32 is half of the maximum effective caliber of the image side surface of the third lens.

Based on the above embodiment, by designing the relationship among the half D11 of the maximum effective aperture of the object-side surface of the first lens, the half D22 of the maximum effective aperture of the image-side surface of the second lens, the half D31 of the maximum effective aperture of the object-side surface of the third lens, and the half D32 of the maximum effective aperture of the image-side surface of the third lens to satisfy the conditional expression: 2.9< D12/D11+ D22/D21+ D32/D31<3.2, therefore, the calibers of the first lens, the second lens and the third lens are kept relatively consistent, the overlarge light deflection angle can be inhibited, the sensitivity is favorably reduced, and the miniaturization is realized while the imaging quality is ensured.

In a second aspect, an embodiment of the present application provides a camera module, which includes the optical lens assembly and the photosensitive element, where the photosensitive element is disposed at an image side of the optical lens assembly. The optical lens group is used for receiving light reflected by a shot object and projecting the light to the photosensitive element, and the photosensitive element is used for converting the light into an image signal.

The camera module that provides based on this application embodiment, through to positive and negative focal power of lens and concave-convex surface collocation, be favorable to shortening the total length of optical lens group, realize optical lens group and the miniaturized design of camera module also is favorable to light to assemble better on the imaging surface of optical lens group simultaneously, seven formula lens designs can increase the degree of freedom, improve resolution, this application is through optimizing lens edge thickness, air gap between the lens, factors such as lens shape of face, the total length of compression mirror group to make camera module match frivolous electronic equipment, dispose big light ring characteristic simultaneously, in rainy day, under the not enough condition of light such as dusk, can guarantee great light inlet quantity, thereby make to have clear shooting picture under the low light level environment, more there is the advantage.

In a third aspect, an embodiment of the present application provides an electronic device, which includes the camera module and the housing as described above, where the camera module is installed in the housing.

Based on the electronic equipment that this application embodiment provided, install as above the module of making a video recording, under the condition that satisfies this electronic equipment ultra-thin design, can also reach the module of making a video recording and possess the requirement of large aperture and good formation of image quality.

The application provides an optical lens group, module and electronic equipment make a video recording, through the optical lens group that the design comprises diaphragm, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens, and will first lens extremely the marginal thickness sum sigma ET of each lens arrives with first lens object side in the seventh lens the relation design between optical lens group image plane distance TTL on the optical axis is for satisfying specific relational expression for seven lens edges closely arrange, and marginal thickness attenuate is favorable to the compression of the total length of mirror group, can realize the ultra-thinness of optical lens group under the condition that satisfies high pixel.

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 according to an embodiment of the present disclosure;

fig. 2 is a spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens assembly according to the first embodiment of the present disclosure;

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

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

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

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

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

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

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

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

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.

In the prior art, the imaging resolution of the imaging lens and the light and thin structure of the imaging lens are difficult to be considered simultaneously. Therefore, how to improve the imaging resolution of the imaging lens and realize the lightness and thinness of the imaging lens structure, so that the imaging lens meets the requirements of a high-order imaging system, becomes a problem to be solved urgently.

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.

Referring to fig. 1 to 10, in order to solve the above technical problem, a first aspect of the present invention provides an optical lens assembly for receiving light from an object side and transmitting the light to an image plane F. The optical lens assembly includes, in order from an object side to an image side along an optical axis 100, 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. The sum of the edge thicknesses of the first lens element 110 to the seventh lens element 170 is Σ ET, where the edge thickness of a lens element refers to a distance from the maximum effective aperture of the object-side surface of the lens element to the maximum effective aperture of the image-side surface of the lens element in a direction parallel to the optical axis 100, the distance from the object-side surface of the first lens element 110 to the image plane F of the optical lens assembly on the optical axis 100 is TTL, and the optical lens assembly satisfies the following conditional expressions: 0.4< Σ ET/TTL < 0.54.

The first lens element 110 has positive optical power, and the object-side surface of the first lens element 110 is convex at the paraxial region 100; the image-side surface of the first lens element 110 at the paraxial region 100 may be concave, flat, or convex, respectively. The first lens element 110 provides most of the positive focal power for focusing and imaging, and the object-side surface of the first lens element 110 is convex at a position near the optical axis 100, which is more favorable for light to enter.

The second lens element 120 has a focal power, and the object-side surface of the second lens element 120 is convex at the paraxial region 100; the second lens element 120 may have positive or negative focal power, and the image-side surface of the second lens element 120 is correspondingly matched with the side surface to satisfy the focal power requirement of the second lens element 120, for example, the image-side surface of the second lens element 120 near the optical axis 100 may be a concave surface, a flat surface, or a convex surface.

The third lens 130 has optical power; the third lens 130 may have a positive power or a negative power. For example, when the object-side surface of the third lens element 130 is concave at the paraxial region 100 and the image-side surface of the third lens element 130 is also concave at the paraxial region 100, the third lens element 130 has negative power. When the object-side surface of the third lens element 130 is convex at the paraxial region 100 and the image-side surface of the third lens element 130 is also convex at the paraxial region 100, the third lens element 130 has positive optical power.

The fourth lens element 140 has a power, the object-side surface of the fourth lens element 140 is convex at the paraxial region 100, and the image-side surface of the fourth lens element 140 is concave at the paraxial region 100; the fourth lens 140 may have a positive power or a negative power.

The fifth lens element 150 has positive optical power, the object-side surface of the fifth lens element 150 is concave at the paraxial region 100, and the image-side surface of the fifth lens element 150 is convex at the paraxial region 100;

the sixth lens element 160 has positive optical power, and the object-side surface of the sixth lens element 160 is convex at the paraxial region 100; the image-side surface of the sixth lens element 160 at the paraxial region 100 may be concave, flat, or convex, respectively.

The seventh lens element 170 has negative power, the image-side surface of the seventh lens element 170 is concave at the paraxial region 100, and the object-side surface or the image-side surface of the seventh lens element 170 includes at least one inflection point; the object-side surface of the seventh lens element 170 may be concave, planar, or convex at a position near the optical axis 100. The seventh lens 170 provides a negative power and can secure a sufficient back focus.

The optical lens group further comprises a diaphragm E0, the diaphragm E0 can reduce stray light in the optical lens group to improve the imaging quality, and the diaphragm E0 can be an aperture diaphragm and/or a field diaphragm. Diaphragm E0 may be located at the object side of the optical lens assembly, or between the object side and the image side of each lens, for example, diaphragm E0 may be located at: an object side surface of the optical lens assembly, between the image side surface of the first lens element 110 and the object side surface of the second lens element 120, between the image side surface of the second lens element 120 and the object side surface of the third lens element 130, between the image side surface of the third lens element 130 and the object side surface of the fourth lens element 140, between the image side surface of the fourth lens element 140 and the object side surface of the fifth lens element 150, between the image side surface of the fifth lens element 150 and the object side surface of the sixth lens element 160, between the image side surface of the sixth lens element 160 and the object side surface of the seventh lens element 170, and between the image side surface of the seventh lens element 170 and the image plane F of the optical lens assembly.

When the stop E0 is located in front, i.e. the stop E0 is located on the object side of the optical lens assembly, the angle of the chief ray incident on the image plane F can be reduced, and the image receiving efficiency of the photosensitive element can be increased.

To save cost, the aperture E0 may be disposed on any one of the object-side surface of the first lens 110, the object-side surface of the second lens 120, the object-side surface of the third lens 130, the object-side surface of the fourth lens 140, the object-side surface of the fifth lens 150, the object-side surface of the sixth lens 160, the object-side surface of the seventh lens 170, the image-side surface of the first lens 110, the image-side surface of the second lens 120, the image-side surface of the third lens 130, the image-side surface of the fourth lens 140, the image-side surface of the fifth lens 150, the image-side surface of the sixth lens 160, and the image-side surface of the seventh lens 170.

Based on the optical lens group provided by the embodiment of the present application, by providing at least one inflection point on the object-side surface or the image-side surface of the seventh lens element 170, an excessive increase of an incident angle from the edge field to the image plane can be suppressed, so that it can be ensured that the relative illuminance of the edge field is not rapidly reduced; by arranging the seven lenses, the optical lens group has more design freedom degrees, and the resolution ratio of the lens can be improved; by matching the positive and negative focal powers of the lenses of the first lens 110 to the seventh lens 170 and the surface type concave-convex at the paraxial region, the total length of the optical system can be shortened, the miniaturization design can be realized, and the light can be converged on the imaging surface of the optical system better; by designing the relationship between the sum Σ ET of the edge thicknesses of the lenses of the first lens element 110 to the seventh lens element 170 and the distance TTL on the optical axis from the side surface of the first lens element 110 to the imaging surface of the optical lens assembly to satisfy the conditional expression: 0.4 [ sigma ] ET/TTL <0.54, like this, in order to overcome the longer problem of seven lens total length, seven lens edges closely arrange in this application, edge thickness attenuate, be favorable to the compression of mirror group total length, and when the numerical relation between above two parameters is higher than the upper limit value of above-mentioned conditional expression, can lead to lens thickness to compress inadequately, and when the numerical relation between above two parameters is less than the lower limit value of above-mentioned conditional expression, can lead to the lens limit in the optical mirror group to be thick too thin, the bearing capacity between each lens is not enough when the equipment is arranged, lead to lens assembly shaping difficulty, make the assembly stability of optical mirror group poor, the manufacturability is poor.

According to some embodiments, the optical lens group further satisfies: 2< | (R41+ R42)/(R41-R42) | < 18; wherein R41 is a radius of curvature of the object-side surface of the fourth lens element 140 at the optical axis, and R42 is a radius of curvature of the image-side surface of the fourth lens element 140 at the optical axis. Based on the above-described embodiment, by designing the relationship between the radius of curvature R41 of the object-side surface of the fourth lens 140 at the optical axis and the radius of curvature R42 of the image-side surface of the fourth lens 140 at the optical axis to satisfy the conditional expression: 2< | (R41+ R42)/(R41-R42) | <18, and the object-side surface of the fourth lens element 140 is convex at the paraxial region 100 and the image-side surface is concave at the paraxial region 100, so that this shape is more favorable for compressing the total length of the optical lens assembly, and by properly configuring the shape of the fourth lens element 140, the distortion of the outer field of view can be adjusted together with the fifth lens element 150 and the sixth lens element 160 while compressing the total length of the optical lens assembly.

According to some embodiments, the optical lens group further satisfies: 0.18< Σ T/TTL < 0.3; where Σ T is the sum of the air gaps on the optical axis of the first lens 110 to the seventh lens 170. Based on the above embodiments, the relationship between the total air gap Σ T on the optical axis 100 between the first lens element 110 and the seventh lens element 170 and the distance TTL on the optical axis 100 between the object-side surface of the first lens element 110 and the image plane F of the optical lens assembly is designed to satisfy the following conditional expression: 0.18< sigma T/TTL <0.3, so that the air gaps among the lenses can be reasonably optimized, the space is compressed, and the ultrathin electronic equipment is more favorably matched, when the numerical relationship between the two parameters is higher than the upper limit value of the conditional expression, the gap gaps are larger, the lens is not uniformly distributed, the total length is not compressed sufficiently under the condition of the same total length, and when the numerical relationship between the two parameters is lower than the lower limit value of the conditional expression, the air gaps among the lenses are smaller, the design freedom of the lenses is poor, the off-axis aberration of the optical lens group is difficult to correct, the imaging quality is reduced, and the ghost risk is increased.

According to some embodiments, the optical lens group further satisfies: 0.7< f1/f < 3.2; wherein f is an effective focal length of the optical lens assembly, and f1 is a focal length of the first lens element 110. Based on the above embodiment, by designing the relationship between the effective focal length f of the optical lens group and the focal length f1 of the first lens element 110 to satisfy the conditional expression: 0.7< f1/f <3.2, so that the field curvature of the optical lens group can be corrected, good imaging quality is ensured, and the effective focal length f is reasonably compressed, which is beneficial to compressing the total length of the optical lens group.

According to some embodiments, at least two of the first lens 110 to the seventh lens 170 have a refractive index n > 1.63. Based on the above embodiment, by designing the refractive indices n of at least two lenses to satisfy the conditional expression: n is more than 1.63, as the optical lens group is a seven-piece lens, the total length of the lens group is required to be compressed, and the lens needs to have higher refractive index in an extremely short space, so that chromatic aberration can be corrected while the total length of the lens group is fully compressed, and high resolution is ensured.

According to some embodiments, the optical lens group further satisfies: 0.28< EPD/(ImgH × 2) < 0.34; the EPD is the diameter of the entrance pupil of the optical lens group, and the ImgH is half of the diagonal length of the effective photosensitive area on the imaging surface F of the optical lens group. Based on the above embodiment, the relationship between the entrance pupil diameter EPD of the optical lens group and half of the diagonal length ImgH of the effective photosensitive area on the imaging plane F of the optical lens group is designed to satisfy the conditional expression: 0.28< EPD/(ImgH 2) <0.34, such that, under the same image height, the larger the entrance pupil diameter of the optical lens assembly, the higher the illumination, the better the imaging quality, and when the numerical relationship between the above two parameters is higher than the upper limit value of the above conditional expression, the entrance pupil diameter of the optical lens assembly is larger, the excessive light enters the optical lens assembly, it is difficult to correct the aberration well, and when the numerical relationship between the above two parameters is lower than the lower limit value of the above conditional expression, the entrance pupil diameter of the optical lens assembly is smaller, the light transmission amount is insufficient, the accuracy in actual image capturing is reduced, and the imaging quality is deteriorated.

According to some embodiments, the optical lens group further satisfies: 2.4< f1/R1< 5.7; where f1 is the focal length of the first lens 110, and R1 is the radius of curvature of the object-side surface of the first lens 110 at the optical axis. Based on the above-described embodiment, by designing the relationship between the focal length f1 of the first lens 110 and the radius of curvature R1 of the object-side surface of the first lens 110 at the optical axis 100 so as to satisfy the conditional expression: 2.4< f1/R1<5.7, so that the total length of the lens group can be shortened and good imaging quality can be maintained, the first lens element 110 provides most positive focal power and mainly controls the effective focal length f of the whole lens, so that the total length of the lens group is further controlled, the object side surface of the first lens element 110 faces to the area where the object to be shot is located, large-angle light rays can enter the optical lens group favorably, the deflection angle of the light rays in the optical lens group is small, the sensitivity is low, and the imaging quality of the lens group can be improved favorably; the first lens element 110 provides most of the positive focal power for focusing and imaging, and the object-side surface of the first lens element is convex at paraxial region, which is more favorable for light entering.

According to some embodiments, the optical lens group further satisfies: f56/f7> -1.71; where f56 is the combined focal length of the fifth lens 150 and the sixth lens 160, and f7 is the focal length of the seventh lens 170. Based on the above-described embodiment, by designing the relationship between the combined focal length f56 of the fifth lens 150 and the sixth lens 160 and the focal length f7 of the seventh lens 170 so as to satisfy the conditional expression: f56/f7> -1.71, so that the fifth lens 150 and the sixth lens 160 together provide positive focal power, cooperate with the first lens 110 to further converge and image light, the seventh lens 170 provides negative focal power to ensure sufficient back focal length, and by reasonably configuring the ratio between the above two parameters, the total length of the optical lens group is further facilitated to be shortened so as to be mounted on ultra-thin electronic equipment, the fifth lens 150 and the sixth lens 160 provide positive focal power, cooperate with the first lens 110 to further compress the total length of the optical lens group, and when the numerical relationship between the above two parameters exceeds the range of the above conditional expressions, the positive focal power provided by the fifth lens 150 and the sixth lens 160 is slightly smaller, and the total length of the optical lens group is insufficiently compressed.

According to some embodiments, the optical lens group further satisfies: 2.9< D12/D11+ D22/D21+ D32/D31< 3.2; the lens structure comprises a first lens, a second lens, a third lens and a fourth lens, wherein D11 is half of the maximum effective caliber of the object side surface of the first lens, D12 is half of the maximum effective caliber of the image side surface of the first lens, D21 is half of the maximum effective caliber of the object side surface of the second lens, D22 is half of the maximum effective caliber of the image side surface of the second lens, D31 is half of the maximum effective caliber of the object side surface of the third lens, and D32 is half of the maximum effective caliber of the image side surface of the third lens. Based on the above embodiment, by designing the relationship among the half D11 of the maximum effective aperture of the object-side surface of the first lens 110, the half D22 of the maximum effective aperture of the image-side surface of the second lens 120, the half D31 of the maximum effective aperture of the object-side surface of the third lens 130, and the half D32 of the maximum effective aperture of the image-side surface of the third lens 130 to satisfy the conditional expression: 2.9< D12/D11+ D22/D21+ D32/D31<3.2, therefore, the calibers of the first lens 110, the second lens 120 and the third lens 130 are kept relatively consistent, the excessive large light deflection angle can be inhibited, the sensitivity is favorably reduced, and the miniaturization is realized while the imaging quality is ensured.

The object-side surface of the lens refers to a surface of the lens facing the object plane, and the image-side surface of the lens refers to a surface of the lens facing the image plane. For example, the object side surface of the first lens 110 refers to a surface of the first lens 110 facing (close to) the object side, and the image side surface of the first lens 110 refers to a surface of the first lens 110 facing (close to) the image plane side.

In order to save the cost of the optical lens assembly, 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 may all be made of plastic material. The imaging quality of the optical lens assembly is closely related to the material of each lens element, and 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 may be made of glass material partially or entirely.

The optical lens group may further include an infrared filter 200, and in order to ensure imaging sharpness of the photographed object on the image side, the infrared filter 200 may be disposed between an image side surface and the image side surface of the lens unit, and the optical lens group may further include an infrared filter 200. Through the arrangement of the infrared filter 200, the light rays pass through the infrared filter 200 after passing through the seventh lens 170, so that infrared rays in the light rays can be effectively filtered, and the imaging definition of the shot object on the image side is further ensured.

The optical lens group is composed 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, and the optical variable parameters of the lens elements satisfy corresponding conditional expressions, so that the distance between the lens elements in the optical lens group is controlled in a small range, and the optical lens group can be ultra-thin under the condition of satisfying high pixel.

The assembly structure and the corresponding implementation result of the optical lens assembly of the present disclosure in each embodiment will be described below with reference to the drawings and tables and with reference to specific numerical values.

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

S1, S3, S5, S7, S9, S11, S13, and S15 are numbers of the object side surfaces of the first to seventh lenses 110 to 170 and the infrared filter 200, respectively, and S2, S4, S6, S8, S10, S12, S14, and S16 are numbers of the image side surfaces of the first to seventh lenses 110 to 170 and the infrared filter 200, respectively.

Example one

Referring to fig. 1, the optical lens assembly in this embodiment includes 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 100 from an object side surface to an image side surface, and a diaphragm E0 is disposed between the object surface of the optical lens assembly and the object side surface of the first lens element 110.

Wherein the first lens 110 has a positive optical power. The object-side surface of the first lens element 110 is convex at the paraxial region 100, and the image-side surface of the first lens element 110 is concave at the paraxial region 100. The object-side surface of the first lens element 110 is convex and the image-side surface of the first lens element 110 is concave.

The second lens 120 has positive optical power. The object-side surface of the second lens element 120 is convex at the paraxial region 100, and the image-side surface of the second lens element 120 is convex at the paraxial region 100. The object-side surface of the second lens element 120 is convex and the image-side surface of the second lens element 120 is convex.

The third lens 130 has a negative power. The object-side surface of the third lens element 130 is convex at the paraxial region 100, and the image-side surface of the third lens element 130 is concave at the paraxial region 100. The object-side surface of the third lens element 130 is circumferentially concave, and the image-side surface of the third lens element 130 is circumferentially concave.

The fourth lens 140 has positive optical power. The object-side surface of the fourth lens element 140 is convex at the paraxial region 100, and the image-side surface of the fourth lens element 140 is concave at the paraxial region 100. The object-side surface of the fourth lens element 140 is circumferentially concave, and the image-side surface of the fourth lens element 140 is circumferentially convex.

The fifth lens 150 has positive optical power. The object-side surface of the fifth lens element 150 is concave at the paraxial region 100, and the image-side surface of the fifth lens element 150 is convex at the paraxial region 100. The object-side surface of the fifth lens element 150 is circumferentially concave, and the image-side surface of the fifth lens element 150 is circumferentially convex.

The sixth lens 160 has positive optical power. The object-side surface of the sixth lens element 160 is convex at the paraxial region 100, and the image-side surface of the sixth lens element 160 is concave at the paraxial region 100. The object-side surface of the sixth lens element 160 is circumferentially concave, and the image-side surface of the sixth lens element 160 is circumferentially convex.

The seventh lens 170 has a negative power. The object-side surface of the seventh lens element 170 is convex at the paraxial region 100, and the image-side surface of the seventh lens element 170 is concave at the paraxial region 100. The object-side surface of the seventh lens element 170 is circumferentially concave, and the image-side surface of the seventh lens element 170 is circumferentially convex.

In this embodiment, the refractive index, abbe number and focal length are referenced to light with a wavelength of 587.60nm, and the relevant parameters of the optical lens assembly are shown in table 1. Wherein F represents the effective focal length of the optical lens assembly, FNO represents the aperture value, FOV represents the field angle of the optical lens assembly in the diagonal direction, and TTL represents the distance from the object-side surface of the first lens element 110 to the image plane F of the optical lens assembly on the optical axis 100.

TABLE 1

The numerical relationships among the relevant parameters of the optical lens assembly in this embodiment are shown in table 2, and it can be known from table 2 that the numerical relationships among the relevant parameters of the optical lens assembly in this embodiment are all within a reasonable range.

TABLE 2

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 4 th order, 6 th order, 8 th order, 10 th order, and 12 th order … … corresponding to orders. In this embodiment, 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 are aspheric. The conic constant K and aspherical surface coefficient corresponding to the surface of each lens are shown in table 3.

TABLE 3

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

The left graph of FIG. 2 is the light spherical aberration curves at 650.000nm, 610.000nm, 587.600nm, 510.000nm and 470.000nm in this embodiment. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the normalized field of view.

It can be seen from the left image of fig. 2 that the spherical aberration corresponding to the wavelengths of 650.000nm, 610.000nm, 587.600nm, 510.000nm and 470.000nm are all within ± 0.05mm, which indicates that the spherical aberration of the optical lens assembly in this embodiment is smaller and the imaging quality is better.

Fig. 2 is a graph of astigmatism at a wavelength of 587.600nm in the present embodiment, in which the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height.

It can be seen from the graph in fig. 2 that astigmatism is within ± 0.05mm, and good compensation is obtained.

FIG. 2 is a graph showing the distortion curve of the present embodiment at a wavelength of 587.600 nm. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height.

It can be seen from the right image of fig. 2 that the distortion is within ± 2.5%, and the distortion is well corrected.

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

Example two

Referring to fig. 3, the optical lens assembly in this embodiment includes 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 100 from an object side surface to an image side surface. And the diaphragm E0 is arranged between the object plane of the optical lens group and the object-side surface of the first lens element 110.

The fifth lens 150 has positive optical power. The object-side surface of the fifth lens element 150 is concave at the paraxial region 100, and the image-side surface of the fifth lens element 150 is convex at the paraxial region 100. The object-side surface of the fifth lens element 150 is circumferentially concave, and the image-side surface of the fifth lens element 150 is circumferentially concave.

The seventh lens 170 has a negative power. The object-side surface of the seventh lens element 170 is convex at the paraxial region 100, and the image-side surface of the seventh lens element 170 is concave at the paraxial region 100. The object-side surface of the seventh lens element 170 is concave on the circumference, and the image-side surface of the seventh lens element 170 is concave on the circumference.

In this embodiment, the refractive index, abbe number and focal length are referenced to light with a wavelength of 587.60nm, and the relevant parameters of the optical lens assembly are shown in table 4. Wherein F represents the effective focal length of the optical lens assembly, FNO represents the aperture value, FOV represents the field angle of the optical lens assembly in the diagonal direction, and TTL represents the distance from the object-side surface of the first lens element 110 to the image plane F of the optical lens assembly on the optical axis 100.

TABLE 4

The numerical relationships among the relevant parameters of the optical lens assembly in this embodiment are shown in table 5, and it can be known from table 5 that the numerical relationships among the relevant parameters of the optical lens assembly in this embodiment are all within a reasonable range.

TABLE 5

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 4 th order, 6 th order, 8 th order, 10 th order, and 12 th order … … corresponding to orders. In this embodiment, 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 are aspheric. The conic constant K and aspherical surface coefficient corresponding to the surface of each lens are shown in table 6.

TABLE 6

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

The left graph of FIG. 4 is the light spherical aberration curves at 650.000nm, 610.000nm, 587.600nm, 510.000nm and 470.000nm in this embodiment. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the normalized field of view.

It can be seen from the left image of fig. 4 that the spherical aberration corresponding to the wavelengths of 650.000nm, 610.000nm, 587.600nm, 510.000nm and 470.000nm are all within ± 0.05mm, which indicates that the spherical aberration of the optical lens assembly in this embodiment is smaller and the imaging quality is better.

Fig. 4 is a graph of astigmatism at a wavelength of 587.600nm in the present embodiment, in which the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height.

It can be seen from the graph in fig. 4 that astigmatism is within ± 0.2mm, and good compensation is obtained.

FIG. 4 is a graph showing the distortion curve of the present embodiment at a wavelength of 587.600 nm. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height.

It can be seen from the right image of fig. 4 that the distortion is within ± 2.5%, and the distortion is well corrected.

EXAMPLE III

Referring to fig. 5, the optical lens assembly in this embodiment includes 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 100 from an object side surface to an image side surface. And the diaphragm E0 is arranged between the object plane of the optical lens group and the object-side surface of the first lens element 110.

Wherein the first lens 110 has a positive optical power. The object-side surface of the first lens element 110 is convex at the paraxial region 100, and the image-side surface of the first lens element 110 is concave at the paraxial region 100. The object-side surface of the first lens element 110 is convex on the circumference, and the image-side surface of the first lens element 110 is convex on the circumference.

The second lens 120 has a negative power. The object-side surface of the second lens element 120 is convex at the paraxial region 100, and the image-side surface of the second lens element 120 is concave at the paraxial region 100. The object-side surface of the second lens element 120 is circumferentially convex, and the image-side surface of the second lens element 120 is circumferentially concave.

The third lens 130 has a negative power. The object-side surface of the third lens element 130 is concave at the paraxial region 100, and the image-side surface of the third lens element 130 is convex at the paraxial region 100. The object-side surface of the third lens element 130 is circumferentially concave, and the image-side surface of the third lens element 130 is circumferentially convex.

The fourth lens 140 has a negative power. The object-side surface of the fourth lens element 140 is convex at the paraxial region 100, and the image-side surface of the fourth lens element 140 is concave at the paraxial region 100. The object-side surface of the fourth lens element 140 is circumferentially concave, and the image-side surface of the fourth lens element 140 is circumferentially convex.

The sixth lens 160 has positive optical power. The object-side surface of the sixth lens element 160 is convex at the paraxial region 100, and the image-side surface of the sixth lens element 160 is convex at the paraxial region 100. The object-side surface of the sixth lens element 160 is circumferentially concave, and the image-side surface of the sixth lens element 160 is circumferentially convex.

The seventh lens 170 has a negative power. The object-side surface of the seventh lens element 170 is concave at the paraxial region 100, and the image-side surface of the seventh lens element 170 is concave at the paraxial region 100. The object-side surface of the seventh lens element 170 is convex and the image-side surface of the seventh lens element 170 is convex.

In this embodiment, the refractive index, abbe number and focal length are referenced to light with a wavelength of 587.60nm, and the relevant parameters of the optical lens assembly are shown in table 7. Wherein F represents the effective focal length of the optical lens assembly, FNO represents the aperture value, FOV represents the field angle of the optical lens assembly in the diagonal direction, and TTL represents the distance from the object-side surface of the first lens element 110 to the image plane F of the optical lens assembly on the optical axis 100.

TABLE 7

The numerical relationships among the relevant parameters of the optical lens assembly in this embodiment are shown in table 8, and it can be known from table 8 that the numerical relationships among the relevant parameters of the optical lens assembly in this embodiment are all within a reasonable range.

TABLE 8

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 4 th order, 6 th order, 8 th order, 10 th order, and 12 th order … … corresponding to orders. In this embodiment, 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 are aspheric. The conic constant K and aspherical surface coefficients corresponding to the surfaces of the respective lenses are shown in table 9.

TABLE 9

In fig. 6, from left to right, a spherical aberration graph, an astigmatism graph and a distortion graph of the fourth embodiment are shown.

The left graph of FIG. 6 is the light spherical aberration curves at 650.000nm, 610.000nm, 587.600nm, 510.000nm and 470.000nm in this embodiment. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the normalized field of view.

It can be seen from the left image of fig. 6 that the spherical aberration corresponding to the wavelengths of 650.000nm, 610.000nm, 587.600nm, 510.000nm and 470.000nm are all within ± 0.05mm, which indicates that the spherical aberration of the optical lens assembly in this embodiment is smaller and the imaging quality is better.

Fig. 6 is a graph of astigmatism at a wavelength of 587.600nm in the present embodiment, in which the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height.

It can be seen from the graph in fig. 6 that astigmatism is within ± 0.05mm, and good compensation is obtained.

FIG. 6 is a graph showing the distortion curve of the present embodiment at a wavelength of 587.600 nm. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height.

It can be seen from the right image of fig. 6 that the distortion is within ± 2%, and the distortion is well corrected.

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

Example four

Referring to fig. 7, the optical lens assembly in this embodiment includes 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 100 from an object side surface to an image side surface. And the diaphragm E0 is arranged between the object plane of the optical lens group and the object-side surface of the first lens element 110.

The third lens 130 has a negative power. The object-side surface of the third lens element 130 is convex at the paraxial region 100, and the image-side surface of the third lens element 130 is concave at the paraxial region 100. The object-side surface of the third lens element 130 is circumferentially concave, and the image-side surface of the third lens element 130 is circumferentially convex.

The seventh lens 170 has a negative power. The object-side surface of the seventh lens element 170 is convex at the paraxial region 100, and the image-side surface of the seventh lens element 170 is concave at the paraxial region 100. The object-side surface of the seventh lens element 170 is convex and the image-side surface of the seventh lens element 170 is convex.

In this embodiment, the refractive index, abbe number and focal length are referenced to light with a wavelength of 587.60nm, and the relevant parameters of the optical lens assembly are shown in table 10. Wherein F represents the effective focal length of the optical lens assembly, FNO represents the aperture value, FOV represents the field angle of the optical lens assembly in the diagonal direction, and TTL represents the distance from the object-side surface of the first lens element 110 to the image plane F of the optical lens assembly on the optical axis 100.

Watch 10

The numerical relationships among the relevant parameters of the optical lens assembly in this embodiment are shown in table 11, and it can be known from table 11 that the numerical relationships among the relevant parameters of the optical lens assembly in this embodiment are all within a reasonable range.

TABLE 11

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 4 th order, 6 th order, 8 th order, 10 th order, and 12 th order … … corresponding to orders. In this embodiment, 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 are aspheric. The conic constant K and aspherical surface coefficient corresponding to the surface of each lens are shown in table 12.

TABLE 12

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

The left graph of FIG. 8 is the light spherical aberration curves at 650.000nm, 610.000nm, 587.600nm, 510.000nm and 470.000nm in this embodiment. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the normalized field of view.

It can be seen from the left image of fig. 8 that the spherical aberration corresponding to the wavelengths of 650.000nm, 610.000nm, 587.600nm, 510.000nm and 470.000nm are all within ± 0.05mm, which indicates that the spherical aberration of the optical lens assembly in this embodiment is smaller and the imaging quality is better.

Fig. 8 is a graph of astigmatism at a wavelength of 587.600nm in the present embodiment, in which the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height.

It can be seen from the graph in fig. 8 that astigmatism is within ± 0.1mm, and good compensation is obtained.

FIG. 8 is a graph showing the distortion at 587.600nm in this example. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height.

It can be seen from the right image of fig. 8 that the distortion is within ± 2%, and the distortion is well corrected.

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

EXAMPLE five

Referring to fig. 9, the optical lens assembly in this embodiment includes 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 100 from an object side surface to an image side surface. And the diaphragm E0 is arranged between the object plane of the optical lens group and the object-side surface of the first lens element 110.

The third lens 130 has a positive optical power. The object-side surface of the third lens element 130 is convex at the paraxial region 100, and the image-side surface of the third lens element 130 is concave at the paraxial region 100. The object-side surface of the third lens element 130 is circumferentially concave, and the image-side surface of the third lens element 130 is circumferentially convex.

In this embodiment, the refractive index, abbe number and focal length are referenced to light with a wavelength of 587.60nm, and the relevant parameters of the optical lens assembly are shown in table 13. Wherein F represents the effective focal length of the optical lens assembly, FNO represents the aperture value, FOV represents the field angle of the optical lens assembly in the diagonal direction, and TTL represents the distance from the object-side surface of the first lens element 110 to the image plane F of the optical lens assembly on the optical axis 100.

Watch 13

The numerical relationships among the relevant parameters of the optical lens assembly in this embodiment are shown in table 14, and it can be known from table 14 that the numerical relationships among the relevant parameters of the optical lens assembly in this embodiment are all within a reasonable range.

TABLE 14

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 4 th order, 6 th order, 8 th order, 10 th order, and 12 th order … … corresponding to orders. In this embodiment, 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 are aspheric. The conic constant K and aspherical surface coefficients corresponding to the surfaces of the respective lenses are shown in table 15.

Watch 15

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

The left graph of FIG. 10 is the light spherical aberration curves at 650.000nm, 610.000nm, 587.600nm, 510.000nm and 470.000nm in this embodiment. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the normalized field of view.

It can be seen from the left image of fig. 10 that the spherical aberration corresponding to the wavelengths of 650.000nm, 610.000nm, 587.600nm, 510.000nm and 470.000nm are all within ± 0.05mm, which indicates that the spherical aberration of the optical lens assembly in this embodiment is smaller and the imaging quality is better.

Fig. 10 is a graph of astigmatism at a wavelength of 587.600nm in the present embodiment, in which the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height.

It can be seen from the graph in fig. 10 that astigmatism is within ± 0.1mm, and good compensation is obtained.

FIG. 10 is a graph showing the distortion curve of the present embodiment at a wavelength of 587.600 nm. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height.

It can be seen from the right image of fig. 10 that the distortion is within ± 2.5%, and the distortion is well corrected.

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

A second aspect of the present application provides a camera module, which includes the above optical lens assembly and a photosensitive element. The optical lens group is used for receiving the light reflected by the shot object and projecting the light to the photosensitive element. The photosensitive element is arranged at the image side of the optical lens group and used for converting light rays into image signals.

This module of making a video recording has adopted foretell optical lens group, based on the module of making a video recording that this application embodiment provided, through to positive and negative focal power and concave convex surface collocation of lens, be favorable to shortening optical lens group's overall length, realize optical lens group and the miniaturized design of module of making a video recording, also be favorable to light to assemble better on optical lens group's the imaging face simultaneously, seven formula lens designs can increase the degree of freedom, and the resolution ratio is improved, and this application is through optimizing lens edge thickness, air gap between the lens, factors such as lens shape of a face, compression mirror group overall length to make the module of making a video recording match frivolous electronic equipment, dispose big light ring characteristic simultaneously, in cloudy rainy day, under the not enough condition of light such as dusk, can guarantee great light inlet quantity, thereby make to have clear shooting picture under low light level environment, more have the advantage.

A third aspect of the present application provides an electronic apparatus, which includes the above-mentioned camera module. This electronic equipment has adopted foretell camera module, under the condition that satisfies this electronic equipment ultra-thin design, can also reach the camera module and possess the requirement of large aperture and good formation of image quality.

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 assembly comprising, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein:

the third lens has optical power;

the optical lens group comprises seven lenses with focal power;

wherein Σ ET is a sum of edge thicknesses of the first lens element to the seventh lens element, and TTL is a distance on the optical axis from the object-side surface of the first lens element to the image plane of the optical lens assembly;

the optical lens group further satisfies the following conditional expression: 2.9< D12/D11+ D22/D21+ D32/D31< 3.2;

the lens structure comprises a first lens, a second lens, a third lens and a fourth lens, wherein D11 is half of the maximum effective caliber of the object side surface of the first lens, D12 is half of the maximum effective caliber of the image side surface of the first lens, D21 is half of the maximum effective caliber of the object side surface of the second lens, D22 is half of the maximum effective caliber of the image side surface of the second lens, D31 is half of the maximum effective caliber of the object side surface of the third lens, and D32 is half of the maximum effective caliber of the image side surface of the third lens.

2. The optical lens group of claim 1, further satisfying:

2<|(R41+R42)/ (R41-R42)|<18；

wherein R41 is a radius of curvature of the fourth lens object-side surface at the optical axis, and R42 is a radius of curvature of the fourth lens image-side surface at the optical axis.

3. The optical lens group of claim 1, further satisfying:

0.18<ΣT/TTL<0.3；

wherein Σ T is the sum of air gaps on the optical axis of the first lens to the seventh lens.

4. The optical lens group of claim 1, further satisfying:

0.7<f1/f<3.2；

wherein f is an effective focal length of the optical lens group, and f1 is a focal length of the first lens element.

5. The optical lens assembly of claim 1, wherein at least two of the first through seventh lenses have refractive index n > 1.63.

6. The optical lens group of claim 1, further satisfying:

0.28<EPD/(ImgH*2)<0.34；

the EPD is the diameter of an entrance pupil of the optical lens group, and the ImgH is half of the length of a diagonal line of an effective photosensitive area on an imaging surface of the optical lens group.

7. The optical lens group of claim 1, further satisfying:

2.4<f1/R1<5.7；

wherein f1 is the focal length of the first lens, and R1 is the radius of curvature of the object-side surface of the first lens at the optical axis.

8. The optical lens group of claim 1, further satisfying:

f56/f7>-1.71；

wherein f56 is a combined focal length of the fifth lens and the sixth lens, and f7 is a focal length of the seventh lens.

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

an optical mirror group as claimed in any one of claims 1 to 8; and

a photosensitive element disposed on an image side of the seventh lens element;

the optical lens group is used for receiving light reflected by a shot object and projecting the light to the photosensitive element, and the photosensitive element is used for converting the light into an image signal.

10. An electronic device, characterized in that,

comprising a camera module according to claim 9; and

the casing, the module of making a video recording install in the casing.