CN210720855U

CN210720855U - Optical lens assembly, image capturing device and electronic device

Info

Publication number: CN210720855U
Application number: CN201921885754.4U
Authority: CN
Inventors: 谢晗; 刘彬彬; 李明
Original assignee: OFilm Tech Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-06-09
Anticipated expiration: 2029-11-04

Abstract

The application discloses optical lens group, image capturing device and electronic device. The optical lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis; the first lens has positive focal power, and the object side surface of the first lens is a convex surface at the optical axis; the second lens, the third lens and the fifth lens have focal power, wherein the object side surface of the third lens is a convex surface at the optical axis, and the image side surface of the third lens is a concave surface at the optical axis; the object side surface of the fifth lens is a convex surface at the optical axis, and the image side surface of the fifth lens is a concave surface at the optical axis; the sixth lens has negative focal power, the object side surface of the sixth lens is a convex surface at the optical axis, the image side surface of the sixth lens is a concave surface at the optical axis, and at least one surface of the object side surface and the image side surface of the sixth lens comprises at least one inflection point; the f-number FNO of the optical lens group meets the condition that FNO is less than or equal to 1.8; the combined focal length f123 of the first lens, the second lens and the third lens and the combined focal length f456 of the fourth lens, the fifth lens and the sixth lens satisfy-1 < f123/f456 < 0.

Description

Optical lens assembly, image capturing device and electronic device

Technical Field

The utility model relates to an optical imaging technology field especially relates to an optical lens group, gets for instance device and electron device.

Background

In recent years, with the development of science and technology, portable electronic products having an image capturing function have been gaining more popularity. The advance of semiconductor technology has led to the decrease of pixel size of the photosensitive devices such as CMOS chips, and the development trend of electronic products is to have a good function, light weight, small size, and small size, so that the miniaturized lens with good imaging quality is the mainstream in the market at present.

In order to ensure the imaging quality, the traditional optical lens is generally large in size and long in overall length, and is difficult to carry on an ultrathin electronic product; in addition, the dark light scene adaptability of the traditional optical lens is weak, the obtained shot picture is dark, and the specialized shooting requirements of users cannot be met.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide an improved optical lens assembly for solving the problems that the conventional optical lens has a long total length on the premise of ensuring the imaging quality and is difficult to adapt to a dark scene.

An optical lens assembly, in order from an object side to an image side along an optical axis, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens has positive focal power, and the object side surface of the first lens is a convex surface at the optical axis; the second lens has optical power; the third lens has focal power, the object side surface of the third lens is a convex surface at the optical axis, and the image side surface of the third lens is a concave surface at the optical axis; the fourth lens has optical power; the fifth lens has focal power, the object side surface of the fifth lens is a convex surface at the optical axis, and the image side surface of the fifth lens is a concave surface at the optical axis; the sixth lens has negative focal power, the object side surface of the sixth lens is a convex surface at the optical axis, the image side surface of the sixth lens is a concave surface at the optical axis, and at least one surface of the object side surface and the image side surface of the sixth lens comprises at least one inflection point; the optical lens group satisfies the following relation:

FNO≤1.8；

-1＜f123/f456＜0；

wherein FNO is an f-number of the optical lens group, f123 is a combined focal length of the first lens, the second lens, and the third lens, and f456 is a combined focal length of the fourth lens, the fifth lens, and the sixth lens.

According to the optical lens group, through reasonably distributing the focal power and the surface type of each lens and the effective focal length of each lens, the aperture of the optical lens group can be effectively increased while the imaging quality of the optical lens group is ensured, so that the dark light shooting capability of the optical lens group is enhanced, and the shooting image quality is improved; meanwhile, by controlling the combined focal length of the first lens, the second lens and the third lens and the combined focal length of the fourth lens, the fifth lens and the sixth lens to satisfy the above relationship, the spherical aberration generated by the first lens, the second lens and the third lens can be effectively corrected, the curvature of field and the distortion of the optical lens group are reduced, and the resolving power of the optical lens group is improved.

In one embodiment, both the object-side surface and the image-side surface of the sixth lens are aspheric.

By setting the object side surface and the image side surface of the sixth lens to be aspheric surfaces, aberration can be effectively corrected, and imaging resolution of the optical lens group is improved.

In one embodiment, the optical lens group satisfies the following relationship: TTL/ImgH is less than or equal to 1.7; wherein, TTL is a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical lens assembly, and ImgH is a half of a diagonal length of an effective pixel area on the imaging surface of the optical lens assembly.

By controlling the distance from the object side surface of the first lens to the imaging surface of the optical lens group on the optical axis and the half of the diagonal length of the effective pixel area on the imaging surface of the optical lens group to satisfy the above relation, the total length of the optical lens group can be effectively shortened, and miniaturization and ultra-thinning are realized.

In one embodiment, the optical lens group satisfies the following relationship: EPD/TTL is more than 0.45; the EPD is an entrance pupil diameter of the optical lens group, and the TTL is a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical lens group.

By controlling the distance between the diameter of the entrance pupil of the optical lens group and the distance between the object side surface of the first lens and the imaging surface of the optical lens group on the optical axis to satisfy the above relation, the total length of the optical lens group can be effectively shortened while the optical lens group has a larger clear aperture, and the miniaturization and ultra-thinning of the lens are realized.

In one embodiment, the optical lens group satisfies the following relationship: R5/R6 is more than 0.3 and less than 3.5; wherein R5 is a radius of curvature of the object-side surface of the third lens element at the optical axis, and R6 is a radius of curvature of the image-side surface of the third lens element at the optical axis.

By controlling the curvature radius of the object side surface of the third lens at the optical axis and the curvature radius of the image side surface of the third lens at the optical axis to satisfy the above relationship, the third lens is designed into a meniscus lens with the convex surface facing the object side, so that the spherical aberration and astigmatism of the optical lens group are well compensated, and the imaging quality of the lens is ensured.

In one embodiment, the optical lens group satisfies the following relationship: 1 < R9/f + R10/f < 2; wherein R9 is a radius of curvature of the object-side surface of the fifth lens element on the optical axis, R10 is a radius of curvature of the image-side surface of the fifth lens element on the optical axis, and f is an effective focal length of the optical lens assembly.

By controlling the curvature radius of the object side surface of the fifth lens at the optical axis, the curvature radius of the image side surface of the fifth lens at the optical axis and the effective focal length of the optical lens group to satisfy the above relations, the shape of the fifth lens can be reasonably optimized, which is beneficial to further correcting the aberration and curvature of field of the optical lens group and improving the imaging quality.

In one embodiment, the optical lens group satisfies the following relationship: MAX (cra) is less than or equal to 38.5 degrees; wherein max (cra) is a maximum incident angle of a chief ray on an imaging surface of the optical lens group.

By controlling the maximum incident angle of the chief ray on the imaging surface of the optical lens group to satisfy the relationship, the increase of the chief ray incident angle of the off-axis field of view can be effectively inhibited, so that the photosensitive element of the ultrahigh pixel can be matched more accurately, and the light energy receiving efficiency of the photosensitive element is improved.

In one embodiment, the optical lens group satisfies the following relationship: f1/OAL > 0.7; wherein f1 is an effective focal length of the first lens, and OAL is a distance on an optical axis from an object side surface of the first lens to an image side surface of the sixth lens.

By controlling the effective focal length of the first lens and the distance between the object side surface of the first lens and the image side surface of the sixth lens on the optical axis to satisfy the above relation, the first lens can have enough positive focal power, thereby being beneficial to compressing the total length of the optical lens group and realizing the miniaturization of the lens; if the ratio of the first lens element to the second lens element is less than or equal to 0.7, the refractive power of the first lens element may be reduced or the total length of the optical lens group may be insufficiently compressed, which is disadvantageous for miniaturization of the lens assembly.

In one embodiment, the optical lens group satisfies the following relationship: T34/P is more than 0.3 and less than 0.5; wherein T34 is an axial distance between an image-side surface of the third lens element and an object-side surface of the fourth lens element, and P is an axial distance between an object-side surface of the third lens element and an image-side surface of the fourth lens element.

The distance between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis and the distance between the object side surface of the third lens and the image side surface of the fourth lens on the optical axis are controlled to satisfy the above relation, so that the air gap between the third lens and the fourth lens is optimized, and a sufficient space is provided for the surface shape adjustment of the image side surface of the third lens and the object side surface of the fourth lens; if the ratio of the third lens to the fourth lens is less than or equal to 0.3, the third lens and the fourth lens are too compact, which is not beneficial to the flexible adjustment of the surface shapes of the third lens and the fourth lens; if the ratio of the third lens to the fourth lens is greater than or equal to 0.5, the third lens and the fourth lens are too dispersed, which is not favorable for miniaturization and ultra-thinning of the lens.

In one embodiment, the optical lens group satisfies the following relationship:

MIN (T56)/MAX (T56) < 0.54; wherein MIN (T56) is a minimum distance from an image side surface of the fifth lens element to an object side surface of the sixth lens element in a direction parallel to the optical axis, and MAX (T56) is a maximum distance from the image side surface of the fifth lens element to the object side surface of the sixth lens element in the direction parallel to the optical axis.

By controlling the minimum distance from the image side surface of the fifth lens element to the object side surface of the sixth lens element in the direction parallel to the optical axis and the maximum distance from the image side surface of the fifth lens element to the object side surface of the sixth lens element in the direction parallel to the optical axis to satisfy the above relationship, the convexes and concaves of the fifth lens element and the sixth lens element can be oriented in the same direction, the configuration is more compact, and the optical lens assembly can be more advantageously miniaturized.

In one embodiment, the optical lens group satisfies the following relationship:

i f1/CT1 + | f2/CT2 + | f3/CT3 + | f4/CT4 + | f5/CT5 + | f6/CT6| > 141; wherein, f1 is the effective focal length of first lens, and f2 is the effective focal length of second lens, and f3 is the effective focal length of third lens, and f4 is the effective focal length of fourth lens, and f5 is the effective focal length of fifth lens, and f6 is the effective focal length of sixth lens, and CT1 is the thickness of first lens on the optical axis, and CT2 is the thickness of second lens on the optical axis, and CT3 is the thickness of third lens on the optical axis, and CT4 is the thickness of fourth lens on the optical axis, and CT5 is the thickness of fifth lens on the optical axis, and CT6 is the thickness of sixth lens on the optical axis.

The effective focal length of each lens and the thickness of each lens on the optical axis are controlled to meet the relation, the focal power size and the center thickness of each lens can be reasonably optimized, so that the imaging quality of the optical lens group can be guaranteed, the total length of the optical lens group can be effectively shortened, and the miniaturization of the lens is realized.

The application also provides an image capturing device.

An image capturing device comprising the optical lens assembly as described above; and the photosensitive element is arranged on the image side of the optical lens group.

The image capturing device can shoot clear and bright images even under the dark light condition by utilizing the optical lens group, has the characteristic of miniaturization, and is convenient to adapt to devices with limited size such as light and thin electronic equipment.

The application also provides an electronic device.

An electronic device comprises a housing and the image capturing device as described above, wherein the image capturing device is mounted on the housing.

The electronic device has the structural characteristics of lightness and thinness, can shoot bright images with good blurring effect and high definition by utilizing the image capturing device, and can meet the shooting requirements of multiple scenes and specialization of users.

Drawings

Fig. 1 shows a schematic structural diagram of an optical lens group of embodiment 1 of the present application;

FIGS. 2A to 2D are a longitudinal spherical aberration diagram, an astigmatism diagram, a distortion diagram and a chief ray incident angle diagram on an imaging plane of the optical lens assembly of example 1, respectively;

FIG. 3 is a schematic diagram showing the structure of an optical lens group according to embodiment 2 of the present application;

FIGS. 4A to 4D are a longitudinal spherical aberration diagram, an astigmatism diagram, a distortion diagram and a chief ray incident angle diagram on an imaging plane of the optical lens assembly of example 2, respectively;

FIG. 5 is a schematic diagram showing the structure of an optical lens group according to embodiment 3 of the present application;

FIGS. 6A to 6D are a longitudinal spherical aberration curve, an astigmatism curve, a distortion curve and a chief ray incident angle curve on an imaging plane of the optical lens assembly of example 3, respectively;

FIG. 7 is a schematic view showing the structure of an optical lens group according to embodiment 4 of the present application;

FIGS. 8A to 8D are a longitudinal spherical aberration diagram, an astigmatism diagram, a distortion diagram and a chief ray incident angle diagram on an imaging plane of the optical lens assembly of example 4, respectively;

FIG. 9 is a schematic view showing the structure of an optical lens group according to embodiment 5 of the present application;

FIGS. 10A to 10D are a longitudinal spherical aberration diagram, an astigmatism diagram, a distortion diagram and a chief ray incident angle diagram on an imaging plane of the optical lens assembly of example 5, respectively;

fig. 11 is a schematic view showing a structure of an optical lens group according to embodiment 6 of the present application;

FIGS. 12A to 12D are a longitudinal spherical aberration curve, an astigmatism curve, a distortion curve and a chief ray incident angle curve on an imaging plane, respectively, of the optical lens assembly of example 6;

fig. 13 is a schematic view showing a structure of an optical lens group according to embodiment 7 of the present application;

fig. 14A to 14D are a longitudinal spherical aberration curve, an astigmatism curve, a distortion curve, and a chief ray incident angle curve on an imaging surface, respectively, of the optical lens group of example 7.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "upper," "lower," "front," "rear," "circumferential," and the like are based on the orientation or positional relationship shown in the drawings and are intended to facilitate the description of the invention and to simplify the description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

For ease of illustration, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

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

The total length of the traditional six-piece optical lens group is usually longer while the imaging quality is guaranteed, so that a lens with the lens group cannot be carried to an ultrathin electronic product.

The defects existing in the above solutions are the results obtained after the inventor has practiced and studied carefully, so the discovery process of the above problems and the solutions proposed by the following embodiments of the present application for the above problems should be the contribution of the inventor to the present application in the process of the present application.

The features, principles and other aspects of the present application are described in detail below.

Referring to fig. 1, fig. 3, fig. 5, fig. 7, fig. 9, fig. 11 and fig. 13, an optical lens assembly with a large aperture, high imaging quality and capable of meeting the requirements of miniaturization and ultra-thinness is provided in the embodiments of the present application. The optical lens group comprises six lenses with focal power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, and an imaging surface positioned on the image side of the sixth lens. The six lenses are arranged in sequence from an object side to an image side along an optical axis.

The first lens has positive focal power and plays a role of mainly converging light, and the object side surface of the first lens is a convex surface at the optical axis, so that the shape and the focal power of the first lens can be adjusted, and the curvature configuration of the two surfaces of the first lens is balanced.

The second lens has a focal power, when the second lens has a positive focal power, the second lens can be matched with the first lens to further shorten the total length of the lens, and when the second lens has a negative focal power, part of aberration generated by the first lens can be corrected, so that the system has higher resolution.

The third lens has focal power, the object side surface of the third lens is a convex surface at the optical axis, and the image side surface of the third lens is a concave surface at the optical axis, so that aberration generated by the first lens and the second lens can be corrected, and the imaging quality is improved.

The fourth lens has focal power, and the image side surface of the fourth lens is a convex surface at the off-axis position, so that the distortion of an off-axis field is favorably reduced, the imaging distortion is avoided, and meanwhile, the aberration is favorably corrected.

The fifth lens has focal power, the object side surface of the fifth lens is a convex surface at the optical axis, the image side surface of the fifth lens is a concave surface at the optical axis, the aberration can be further favorably corrected, meanwhile, the image side surface of the fifth lens is a convex surface at the off-axis, the fifth lens is favorable for being matched with the sixth lens to reduce the incidence angle of the chief ray of the off-axis field, and the matching degree with the traditional photosensitive element is improved.

The sixth lens can have negative focal power, so that the back focal length of the lens group can be shortened, and the lens provided with the optical lens group can be arranged on ultrathin electronic equipment; meanwhile, the object side surface of the sixth lens is a convex surface at the optical axis, so that the shape and focal power of the sixth lens can be adjusted and controlled, and aberration can be further corrected; the image side surface of the sixth lens is a concave surface at the optical axis, so that the optical lens group can be configured with a proper back focal length to realize the miniaturization of the lens; at least one surface of the object side surface and the image side surface of the sixth lens comprises at least one inflection point, so that the angle of light rays of the off-axis field of view incident on the photosensitive element is effectively suppressed, the light rays are more accurately matched with the photosensitive element, and the light energy receiving efficiency of the photosensitive element is improved.

Specifically, the optical lens group satisfies the following relationship: FNO is less than or equal to 1.8; wherein FNO is the f-number of the optical lens group. The FNO may be 1.4, 1.5, 1.6, 1.7, or 1.8. By controlling the diaphragm number of the optical lens group to meet the relation, the optical lens group can have a larger entrance pupil aperture under the condition of ensuring the miniaturization of the optical lens group so as to increase the light incoming amount, obtain a clearer and brighter image and meet the shooting requirements of dim light scenes such as night scenes, starry sky and the like; in addition, the smaller the FNO is, the better blurring effect of the optical lens group is shown, and better visual experience can be brought to users.

Specifically, the optical lens group satisfies the following relationship: -1 < f123/f456 < 0; where f123 is a combined focal length of the first lens, the second lens, and the third lens, and f456 is a combined focal length of the fourth lens, the fifth lens, and the sixth lens. f123/f456 can be-0.95, -0.65, -0.35, -0.25, -0.20, -0.15, -0.10, or-0.05. Under the condition of satisfying the above relationship, the first, second and third lenses can be made to provide enough positive focal power to perform better light convergence, and the fourth, fifth and sixth lenses can be made to provide proper negative focal power to correct spherical aberration generated by the first, second and third lenses, reduce curvature of field and distortion of the optical lens group, and improve resolving power of the optical lens group.

When the optical lens group is used for imaging, light rays emitted or reflected by a shot object enter the optical lens group from the object side direction, sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, and finally converge on an imaging surface.

According to the optical lens group, the focal power and the surface type of each lens and the effective focal length of each lens are reasonably distributed, so that the diaphragm of the optical lens group can be effectively increased while the imaging quality of the optical lens group is ensured, the dark light shooting capability of the optical lens group is enhanced, and the shooting image quality is improved.

In an exemplary embodiment, both the object-side surface and the image-side surface of the sixth lens are provided as aspherical surfaces. By setting the object side surface and the image side surface of the sixth lens element to be aspheric surfaces, aberration can be effectively corrected, and imaging resolution of the optical lens assembly is improved.

In an exemplary embodiment, the optical lens group satisfies the following relation: TTL/ImgH is less than or equal to 1.7; wherein, TTL is a distance on the optical axis from the object side surface of the first lens element to the imaging surface of the optical lens assembly, and ImgH is a half of a diagonal length of an effective pixel area on the imaging surface of the optical lens assembly. TTL/ImgH can be 1.378, 1.428, 1.458, 1.488, 1.518, 1.548, 1.578, or 1.608. Under the condition of satisfying the relation, the total length of the optical lens group can be effectively shortened, and the miniaturization and ultra-thinness of the lens are realized; meanwhile, when the total length of the optical lens group is determined, the optical lens group has wide-angle characteristics as the diagonal distance of the effective pixel region is larger, and has telephoto characteristics as the diagonal distance of the effective pixel region is smaller.

In an exemplary embodiment, the optical lens group satisfies the following relation: EPD/TTL is more than 0.45; the EPD is an entrance pupil diameter of the optical lens assembly, and the TTL is a distance on the optical axis from the object-side surface of the first lens element to the imaging surface of the optical lens assembly. The EPD/TTL can be 0.451, 0.455, 0.459, 0.464, 0.484, 0.504, 0.524, 0.544, 0.564, or 0.584. Under the condition of satisfying the relation, the total length of the optical lens group can be effectively shortened while the optical lens group has larger light-passing aperture, thereby realizing the miniaturization and ultra-thinning of the lens.

In an exemplary embodiment, the optical lens group satisfies the following relation: R5/R6 is more than 0.3 and less than 3.5; wherein, R5 is the radius of curvature of the object-side surface of the third lens element at the optical axis, and R6 is the radius of curvature of the image-side surface of the third lens element at the optical axis. R5/R6 may be 0.328, 0.348, 0.368, 0.768, 1.168, 1.568, 2.068, 2.568, 3.068 or 3.368. Under the condition of satisfying the above relationship, the third lens element can be designed as a meniscus lens with the convex surface facing the object side, so that the spherical aberration and astigmatism of the optical lens assembly can be well compensated, and the imaging quality can be ensured.

In an exemplary embodiment, the optical lens group satisfies the following relation: 1 < R9/f + R10/f < 2; wherein, R9 is a curvature radius of the object-side surface of the fifth lens element on the optical axis, R10 is a curvature radius of the image-side surface of the fifth lens element on the optical axis, and f is an effective focal length of the optical lens assembly. (R9/f + R10/f) may be 1.437, 1.487, 1.537, 1.587, 1.637, 1.687, 1.737, 1.787, 1.837, 1.887, 1.937, 1.987 or 1.996. Under the condition of meeting the relation, the shape of the fifth lens can be reasonably optimized so as to further correct the aberration and curvature of field of the optical lens group and improve the imaging quality.

In an exemplary embodiment, the optical lens group satisfies the following relation: MAX (cra) is less than or equal to 38.5 degrees; where, max (cra) is the maximum incident angle of the chief ray on the imaging surface of the optical lens group. Max (cra) may be 31.5 °, 32.5 °, 33.5 °, 34.5 °, 35.5 °, 36.5 °, 37.5 ° or 38.5 °. Under the condition of satisfying the above relation, the increase of the chief ray incident angle of the off-axis field of view can be effectively inhibited, so that the chief ray can be more accurately matched with the photosensitive element of the ultrahigh pixel, and the light energy receiving efficiency of the photosensitive element is improved.

In an exemplary embodiment, the optical lens group satisfies the following relation: f1/OAL > 0.7; where f1 is the effective focal length of the first lens element, and OAL is the distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the sixth lens element. f1/OAL can be 0.743, 0.943, 1.143, 1.343, 1.543, 1.743, 1.943 or 2.143. Under the condition of satisfying the relation, the first lens can have enough positive focal power, thereby being beneficial to compressing the total length of the optical lens group and realizing the miniaturization of the lens; if the ratio of the first to the second is 0.7 or less, the refractive power of the first lens element is reduced or the total length of the optical lens group is insufficiently compressed, which is disadvantageous to the miniaturization of the lens barrel.

In an exemplary embodiment, the optical lens group satisfies the following relation: T34/P is more than 0.3 and less than 0.5; wherein T34 is the distance on the optical axis from the image-side surface of the third lens element to the object-side surface of the fourth lens element, and P is the distance on the optical axis from the object-side surface of the third lens element to the image-side surface of the fourth lens element. T34/P may be 0.333, 0.343, 0.353, 0.363, 0.373, 0.383, 0.393, 0.403, 0.413, 0.423 or 0.433. Under the condition that the relation is met, the air gap between the third lens and the fourth lens can be optimized, and a sufficient space is provided for adjusting the surface shape of the image side surface of the third lens and the object side surface of the fourth lens; meanwhile, if the ratio of the third lens to the fourth lens is less than or equal to 0.3, the third lens and the fourth lens are too compact, which is not beneficial to the flexible adjustment of the surface shapes of the third lens and the fourth lens; if the ratio of the third lens to the fourth lens is greater than or equal to 0.5, the third lens and the fourth lens are too dispersed, which is not favorable for miniaturization and ultra-thinning of the lens.

In an exemplary embodiment, the optical lens group satisfies the following relation:

MIN (T56)/MAX (T56) < 0.54; wherein MIN (T56) is a minimum distance from the image-side surface of the fifth lens element to the object-side surface of the sixth lens element in a direction parallel to the optical axis, and MAX (T56) is a maximum distance from the image-side surface of the fifth lens element to the object-side surface of the sixth lens element in the direction parallel to the optical axis. MIN (T56)/MAX (T56) may be 0.063, 0.093, 0.153, 0.253, 0.303, 0.353, 0.403, 0.453, 0.503, or 0.534. Under the condition that the relation is satisfied, the concave-convex directions of the fifth lens and the sixth lens can be the same, the configuration is more compact, and the miniaturization of the optical lens group is more favorably realized.

i f1/CT1 + | f2/CT2 + | f3/CT3 + | f4/CT4 + | f5/CT5 + | f6/CT6| > 141; wherein f1, f2, f3, f4, f5 and f6 are respectively effective focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, and CT1, CT2, CT3, CT4, CT5 and CT6 are respectively thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis. The effective focal length of each lens and the thickness of each lens on the optical axis satisfy the relation, the focal power size and the center thickness of each lens can be reasonably optimized, so that the imaging quality of the optical lens group can be guaranteed, the total length of the optical lens group can be effectively shortened, and the miniaturization of the lens is realized.

In an exemplary embodiment, the optical lens group is further provided with an aperture stop, which may be provided between the object side of the optical lens group and the first lens, or between the first lens and the sixth lens. Preferably, the aperture stop is located between the object side of the optical lens group and the first lens to effectively suppress excessive increase of the incident angle of the chief ray, so that the optical lens group is better matched with the photosensitive element of the traditional specification.

In other embodiments, the aperture stop may also be located on a surface (e.g., object side and image side) of any of the first through sixth lenses in an operative relationship with the lenses, e.g., by applying a light blocking coating to the surface of the lenses to form the aperture stop at that surface; or the surface of the clamping lens is fixedly clamped by the clamping piece, and the structure of the clamping piece on the surface can limit the width of the imaging light beam of the on-axis object point, so that the aperture stop is formed on the surface.

In the exemplary embodiment, lens surfaces of the first lens to the sixth lens are aspheric, so that flexibility of lens design can be improved, aberrations can be effectively corrected, and imaging resolution of the optical lens group can be improved. In other embodiments, the object-side surface and the image-side surface of each lens of the optical lens group may be spherical. It is noted that the above embodiments are merely examples of some embodiments of the present application, and in some embodiments, the surface of each lens in the optical lens group may be an aspheric surface or any combination of spherical surfaces.

In an exemplary embodiment, each lens in the optical lens assembly may be made of glass or plastic, the plastic lens can reduce the weight and the production cost of the optical lens assembly, and the glass lens can provide the optical lens assembly with excellent optical performance and higher temperature resistance. It should be noted that the material of each lens in the optical lens assembly may also be any combination of glass and plastic, and is not necessarily all glass or all plastic.

In an exemplary embodiment, the optical lens group further includes a filter for filtering out infrared rays and/or a protective glass for protecting the photosensitive element, wherein the photosensitive element is located on an imaging surface of the optical lens group. Further, the image forming surface may be a photosensitive surface of a photosensitive element.

The optical lens group of the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. Through rational distribution of focal length, focal power, surface type, thickness of each lens and on-axis distance between each lens, the total length of the optical lens group is small and has a super large aperture (FNO can be 1.4), and the optical lens group also has high imaging quality, thereby better meeting the adaptation requirements and the dim light shooting requirements of light and thin electronic equipment such as mobile phones and flat plates. It is to be understood that although six lenses are exemplified in the embodiment, the optical lens group is not limited to include six lenses, and the optical lens group may include other numbers of lenses if necessary.

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

Example 1

An optical lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D.

Fig. 1 shows a schematic structural diagram of an optical lens group of embodiment 1. As shown in fig. 1, the optical lens group includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an image plane S15.

The first lens element L1 has positive power, with an object-side surface S1 being convex at the optical axis and convex at the circumference, and an image-side surface S2 being concave at the optical axis and concave at the circumference.

The second lens element L2 has positive power, and has an object-side surface S3 being convex at the optical axis and convex at the circumference, and an image-side surface S4 being convex at the optical axis and convex at the circumference.

The third lens element L3 has negative power, and has an object-side surface S5 being convex at the optical axis and convex at the circumference, and an image-side surface S6 being concave at the optical axis and concave at the circumference.

The fourth lens element L4 has negative power, and has an object-side surface S7 being concave at the optical axis and concave at the circumference, and an image-side surface S8 being convex at the optical axis and convex at the circumference.

The fifth lens element L5 has positive power, and has an object-side surface S9 being convex at the optical axis and concave at the circumference, and an image-side surface S10 being concave at the optical axis and convex at the circumference.

The sixth lens element L6 has negative power, and has an object-side surface S11 being convex at the optical axis and concave at the circumference, and an image-side surface S12 being concave at the optical axis and convex at the circumference.

The object-side surface and the image-side surface of each of the first lens L1 to the sixth lens L6 are aspheric, and the aspheric design can solve the problem of distortion of the field of view, and can realize excellent optical imaging effect even when the lenses are small, thin and flat, thereby enabling the optical lens group to have miniaturization characteristics.

The first lens L1 to the sixth lens L6 are made of plastic, and the plastic lens can reduce the weight of the optical lens assembly and reduce the production cost.

A stop STO is also arranged between the object OBJ and the first lens L1 to further improve the imaging quality of the optical lens group.

The optical lens group further includes a filter L7 having an object side surface S13 and an image side surface S14. Light from the object OBJ sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging plane S15. Further, the optical filter L7 is an infrared filter for filtering out infrared light from the external light incident on the optical lens assembly, thereby avoiding image distortion. Specifically, the infrared filter L7 is made of glass. The infrared filter L7 may be part of the optical lens group and assembled with each lens, or may be installed when the optical lens group and the photosensitive element are assembled.

Table 1 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens group of example 1, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). In addition, for the first lens element L1, the first numerical value in the "thickness" parameter row of the first lens element L1 is the optical-axis thickness of the lens element, and the second numerical value is the optical-axis distance from the image-side surface of the lens element to the object-side surface of the following lens element in the image-side direction. The reference wavelength in Table 1 is 555 nm.

TABLE 1

The aspherical surface shape in each lens is defined by the following formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1); k is a conic coefficient; ai is the ith order coefficient of the aspheric surface. Table 2 below gives the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the aspherical surfaces S1 to S12 of the lens in example 1.

TABLE 2

The length ImgH of half of the diagonal line of the effective pixel area on the imaging surface S15 of the optical lens assembly of this embodiment is 3.4mm, so it can be seen from the data in tables 1 and 2 that the optical lens assembly of embodiment 1 satisfies:

FNO is 1.8, wherein FNO is the f-number of the optical lens group;

f123/f456 is-0.198, where f123 is a combined focal length of the first lens L1, the second lens L2, and the third lens L3, and f456 is a combined focal length of the fourth lens L4, the fifth lens L5, and the sixth lens L6;

TTL/ImgH is 1.422, where TTL is the distance on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S15 of the optical lens group, and ImgH is half the diagonal length of the effective pixel area on the imaging surface S15 of the optical lens group;

EPD/TTL is 0.461, where EPD is an entrance pupil diameter of the optical lens group, and TTL is a distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface S15 of the optical lens group;

R5/R6 ═ 2.876, where R5 is the radius of curvature of the object-side surface S5 of the third lens L3 at the optical axis, and R6 is the radius of curvature of the image-side surface S6 of the third lens L3 at the optical axis;

r9/f + R10/f is 1.604, where R9 is the radius of curvature of the object-side surface S9 of the fifth lens L5 at the optical axis, R10 is the radius of curvature of the image-side surface S10 of the fifth lens L5 at the optical axis, and f is the effective focal length of the optical lens group;

max (cra) ═ 34.3 °, where max (cra) is the maximum angle of incidence of the chief ray on the imaging surface of the optical lens group;

f1/OAL is 1.904, where f1 is the effective focal length of the first lens L1, and OAL is the distance on the optical axis from the object side surface S1 of the first lens L1 to the image side surface S12 of the sixth lens L6;

T34/P is 0.414, where T34 is the distance on the optical axis from the image-side surface S6 of the third lens L3 to the object-side surface S7 of the fourth lens L4, and P is the distance on the optical axis from the object-side surface S5 of the third lens L3 to the image-side surface S8 of the fourth lens L4;

MIN (T56)/MAX (T56) ═ 0.534, where MIN (T56) is the minimum distance in the direction parallel to the optical axis between the image-side surface S10 of the fifth lens L5 and the object-side surface S11 of the sixth lens L6, and MAX (T56) is the maximum distance in the direction parallel to the optical axis between the image-side surface S10 of the fifth lens L5 and the object-side surface S11 of the sixth lens L6;

i f1/CT1 i + | f2/CT2 i + | f3/CT3 i + | f4/CT4 i + | f5/CT5 i + | f6/CT6 i 178.109, where f1, f2, f3, f4, f5, and f6 are the respective effective focal lengths of first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6, and CT1, CT2, CT3, CT4, CT5, and CT6 are the respective thicknesses of first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 on the respective optical axes.

FIG. 2A shows longitudinal spherical aberration curves of the optical lens group of example 1, which represent convergent focus deviations after passing through the optical lens group of light rays having wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm, respectively; fig. 2B shows astigmatism curves of the optical lens group of example 1, which represent meridional field curvature and sagittal field curvature; FIG. 2C shows a distortion curve of the optical lens group of embodiment 1, which represents the distortion rate for different image heights; fig. 2D shows a chief ray (chief ray angle) incident angle curve on the imaging surface S15 of the optical lens group of embodiment 1, which represents the incident angle of the chief ray to the photosensitive element under different image heights. As can be seen from fig. 2A to 2D, the optical lens assembly of embodiment 1 can achieve good imaging quality.

Example 2

An optical lens group according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical lens group according to embodiment 2 of the present application.

As shown in fig. 3, the optical lens group includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an image plane S15.

The fourth lens element L4 has positive power, and has an object-side surface S7 that is concave along the optical axis and concave along the circumference, and an image-side surface S8 that is convex along the optical axis and convex along the circumference.

The fifth lens element L5 has negative power, and has an object-side surface S9 being convex at the optical axis and concave at the circumference, and an image-side surface S10 being concave at the optical axis and convex at the circumference.

The optical lens group further includes a filter L7 having an object side surface S13 and an image side surface S14. Light from the object OBJ sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging plane S15. Further, the optical filter L7 is an infrared filter for filtering out infrared light from the external light incident on the optical lens assembly, thereby avoiding image distortion.

Table 3 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens group of example 2, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm); table 4 shows high-order term coefficients that can be used for the lens aspheres S1-S12 in example 2, in which the aspherical surface types can be defined by formula (1) given in example 1; table 5 shows the values of the relevant parameters of the optical lens group given in example 2. The reference wavelength was 555 nm.

TABLE 3

TABLE 4

TABLE 5

FIG. 4A shows longitudinal spherical aberration curves of the optical lens group of example 2, in which the converging focuses of the light rays of different wavelengths respectively deviate through the optical lens group; fig. 4B shows astigmatism curves of the optical lens group of example 2, which represent meridional field curvature and sagittal field curvature; FIG. 4C shows a distortion curve of the optical lens group of embodiment 2, which represents the distortion rate in the case of different image heights; fig. 4D shows a chief ray incidence angle curve on the imaging surface S15 of the optical lens group of embodiment 2, which represents the incidence angles of chief rays on the photosensitive elements under different image heights. As can be seen from fig. 4A to 4D, the optical lens assembly of embodiment 2 can achieve good imaging quality.

Example 3

An optical lens group according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 5 shows a schematic structural diagram of an optical lens group according to embodiment 3 of the present application.

As shown in fig. 5, the optical lens group includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an image plane S15.

The first lens element L1 has positive power, and has an object-side surface S1 being convex at the optical axis and convex at the circumference, and an image-side surface S2 being convex at the optical axis and convex at the circumference.

The second lens element L2 has negative power, and has an object-side surface S3 that is concave along the optical axis and concave along the circumference, and an image-side surface S4 that is convex along the optical axis and convex along the circumference.

The sixth lens element L6 has negative power, and has an object-side surface S11 being convex at the optical axis and convex at the circumference, and an image-side surface S12 being concave at the optical axis and convex at the circumference.

Table 6 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens group of example 3, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm); table 7 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S12 in embodiment 3, wherein the aspherical surface type can be defined by formula (1) given in embodiment 1; table 8 shows the values of the relevant parameters of the optical lens group given in example 3. The reference wavelength was 555 nm.

TABLE 6

TABLE 7

TABLE 8

FIG. 6A shows longitudinal spherical aberration curves of the optical lens group of example 3, in which light rays of different wavelengths respectively deviate from the convergent focus after passing through the optical lens group; fig. 6B shows astigmatism curves of the optical lens group of example 3, which represent meridional field curvature and sagittal field curvature; FIG. 6C shows a distortion curve of the optical lens group of embodiment 3, which represents the distortion rate for different image heights; fig. 6D shows a chief ray incidence angle curve on the imaging surface S15 of the optical lens group of embodiment 3, which represents the incidence angles of chief rays on the photosensitive elements under different image heights. As can be seen from fig. 6A to 6D, the optical lens assembly of embodiment 3 can achieve good imaging quality.

Example 4

An optical lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 7 shows a schematic structural diagram of an optical lens group according to embodiment 4 of the present application.

As shown in fig. 7, the optical lens group includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an image plane S15.

The fourth lens element L4 has positive power, and has an object-side surface S7 being convex at the optical axis and concave at the circumference, and an image-side surface S8 being concave at the optical axis and convex at the circumference.

Table 9 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens group of example 4, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm); table 10 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S12 in embodiment 4, wherein the aspherical surface types can be defined by formula (1) given in embodiment 1; table 11 shows the values of the relevant parameters of the optical lens group given in example 4. The reference wavelength was 555 nm.

TABLE 9

Watch 10

TABLE 11

FIG. 8A is a graph showing longitudinal spherical aberration curves of the optical lens group of example 4, in which light rays of different wavelengths respectively deviate from the convergent focus after passing through the optical lens group; fig. 8B shows astigmatism curves of the optical lens group of example 4, which represent meridional field curvature and sagittal field curvature; FIG. 8C shows a distortion curve of the optical lens group of embodiment 4, which represents the distortion rate in the case of different image heights; fig. 8D shows a chief ray incidence angle curve on the imaging surface S15 of the optical lens group of embodiment 4, which represents the incidence angles of chief rays on the photosensitive elements under different image heights. As can be seen from fig. 8A to 8D, the optical lens assembly of embodiment 4 can achieve good imaging quality.

Example 5

An optical lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 9 shows a schematic structural diagram of an optical lens group according to embodiment 5 of the present application.

As shown in fig. 9, the optical lens group includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an image plane S15.

The third lens element L3 has positive power, and has an object-side surface S5 being convex at the optical axis and convex at the circumference, and an image-side surface S6 being concave at the optical axis and concave at the circumference.

Table 12 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens group of example 5, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm); table 13 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S12 in example 5, wherein the aspherical surface type can be defined by formula (1) given in example 1; table 14 shows the values of the relevant parameters of the optical lens group given in example 5. The reference wavelength was 555 nm.

TABLE 12

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TABLE 14

FIG. 10A is a graph showing longitudinal spherical aberration curves of the optical lens group of example 5, in which light rays of different wavelengths respectively deviate from the convergent focus after passing through the optical lens group; fig. 10B shows astigmatism curves of the optical lens group of example 5, which represent meridional field curvature and sagittal field curvature; FIG. 10C shows a distortion curve of the optical lens group of example 5, which represents the distortion rate in the case of different image heights; fig. 10D shows a chief ray incidence angle curve on the imaging surface S15 of the optical lens group of embodiment 5, which represents the incidence angles of chief rays on the photosensitive elements under different image heights. As can be seen from fig. 10A to 10D, the optical lens assembly according to embodiment 5 can achieve good imaging quality.

Example 6

An optical lens group according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 11 shows a schematic structural diagram of an optical lens group according to embodiment 6 of the present application.

As shown in fig. 11, the optical lens group includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an image plane S15.

Table 15 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens group of example 6, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm); table 16 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S12 in example 6, wherein the aspherical surface types can be defined by formula (1) given in example 1; table 17 shows the values of the relevant parameters of the optical lens group given in example 6. The reference wavelength was 555 nm.

Watch 15

TABLE 16

TABLE 17

FIG. 12A is a graph showing longitudinal spherical aberration curves of the optical lens group of example 6, in which light rays of different wavelengths respectively deviate from the convergent focus after passing through the optical lens group; fig. 12B shows astigmatism curves of the optical lens group of example 6, which represent meridional field curvature and sagittal field curvature; FIG. 12C shows a distortion curve of the optical lens group of embodiment 6, which represents the distortion rate in the case of different image heights; fig. 12D shows a chief ray incidence angle curve on the imaging surface S15 of the optical lens group of embodiment 6, which represents the incidence angles of chief rays on the photosensitive elements under different image heights. As can be seen from fig. 12A to 12D, the optical lens group according to embodiment 6 can achieve good imaging quality.

Example 7

An optical lens group according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 13 is a schematic view showing a structure of an optical lens group according to embodiment 7 of the present application.

As shown in fig. 13, the optical lens group includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an image plane S15.

The third lens element L3 has negative power, and has an object-side surface S5 that is convex along the optical axis and concave along the circumference, and an image-side surface S6 that is concave along the optical axis and concave along the circumference.

The fourth lens element L4 has positive power, and has an object-side surface S7 being convex at the optical axis and concave at the circumference, and an image-side surface S8 being convex at the optical axis and convex at the circumference.

Table 18 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens group of example 7, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm); table 19 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S12 in example 7, wherein the aspherical surface types can be defined by formula (1) given in example 1; table 20 shows the values of the relevant parameters of the optical lens group given in example 7. The reference wavelength was 555 nm.

Watch 18

Watch 19

Watch 20

FIG. 14A is a graph showing longitudinal spherical aberration curves of the optical lens group of example 7, in which light rays of different wavelengths respectively deviate from the convergent focus after passing through the optical lens group; fig. 14B shows astigmatism curves of the optical lens group of example 7, which represent meridional field curvature and sagittal field curvature; FIG. 14C shows a distortion curve of the optical lens group of embodiment 7, which represents the distortion rate in the case of different image heights; fig. 14D shows a chief ray incidence angle curve on the imaging surface S15 of the optical lens group of example 7, which represents the incidence angles of chief rays on the photosensitive elements under different image heights. As can be seen from fig. 14A to 14D, the optical lens group according to embodiment 7 can achieve good imaging quality.

The present application further provides an image capturing apparatus, comprising the optical lens assembly as described above; and the photosensitive element is arranged on the image side of the optical lens group and used for receiving light which is formed by the optical system and carries image information. Specifically, the photosensitive element may be a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge-coupled Device (CCD) image sensor.

The present application further provides an electronic device, which includes a housing and the image capturing device as described above, wherein the image capturing device is mounted on the housing for capturing an image.

Specifically, get for instance the device setting in the casing and expose from the casing and in order to acquire the image, the casing can provide protection such as dustproof, waterproof falling for getting for instance the device, has seted up the hole that corresponds with getting for instance the device on the casing to make light penetrate or wear out the casing from the hole.

The electronic device has the structural characteristics of lightness and thinness, and bright images with good blurring effect and high definition can be shot by using the image capturing device, so that the multi-scene and specialized shooting requirements of users are met.

As used in embodiments of the present application, an "electronic device" may include, but is not limited to, a device configured to receive or transmit communication signals via a wireline connection and/or via a wireless interface. Electronic devices arranged to communicate over a wireless interface may be referred to as "wireless communication terminals", "wireless terminals", or "mobile terminals". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communication System (PCS) terminals that may combine a cellular radiotelephone with data processing, facsimile and data communication capabilities; personal Digital Assistants (PDAs) that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

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

the first lens has positive focal power, and the object side surface of the first lens is a convex surface at the optical axis;

the second lens has optical power;

the third lens has focal power, the object side surface of the third lens is a convex surface at the optical axis, and the image side surface of the third lens is a concave surface at the optical axis;

the fourth lens has optical power;

the fifth lens has focal power, the object side surface of the fifth lens is a convex surface at the optical axis, and the image side surface of the fifth lens is a concave surface at the optical axis;

the sixth lens has negative focal power, the object side surface of the sixth lens is a convex surface at the optical axis, the image side surface of the sixth lens is a concave surface at the optical axis, and at least one surface of the object side surface and the image side surface of the sixth lens comprises at least one inflection point;

the optical lens group satisfies the following relation:

FNO≤1.8；

-1＜f123/f456＜0；

2. The optical lens group of claim 1, wherein the sixth lens element has both an object-side surface and an image-side surface that are aspheric.

3. An optical lens group according to claim 1, characterized in that it satisfies the following relation:

TTL/ImgH≤1.7；

wherein, TTL is a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical lens assembly, and ImgH is a half of a diagonal length of an effective pixel area on the imaging surface of the optical lens assembly.

4. An optical lens group according to claim 1, characterized in that it satisfies the following relation:

EPD/TTL＞0.45；

the EPD is an entrance pupil diameter of the optical lens group, and the TTL is a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical lens group.

5. An optical lens group according to claim 1, characterized in that it satisfies the following relation:

0.3＜R5/R6＜3.5；

wherein R5 is a radius of curvature of the object-side surface of the third lens element at the optical axis, and R6 is a radius of curvature of the image-side surface of the third lens element at the optical axis.

6. An optical lens group according to claim 1, characterized in that it satisfies the following relation:

1＜R9/f+R10/f＜2；

wherein R9 is a radius of curvature of the object-side surface of the fifth lens element on the optical axis, R10 is a radius of curvature of the image-side surface of the fifth lens element on the optical axis, and f is an effective focal length of the optical lens assembly.

7. An optical lens group according to claim 1, characterized in that it satisfies the following relation:

MAX(cra)≤38.5°；

wherein max (cra) is a maximum incident angle of a chief ray on an imaging surface of the optical lens group.

8. An optical lens group according to claim 1, characterized in that it satisfies the following relation:

f1/OAL＞0.7；

wherein f1 is an effective focal length of the first lens, and OAL is a distance on an optical axis from an object side surface of the first lens to an image side surface of the sixth lens.

9. An optical lens group according to claim 1, characterized in that it satisfies the following relation:

0.3＜T34/P＜0.5；

wherein T34 is an axial distance between an image-side surface of the third lens element and an object-side surface of the fourth lens element, and P is an axial distance between an object-side surface of the third lens element and an image-side surface of the fourth lens element.

10. An optical lens group according to claim 1, characterized in that it satisfies the following relation:

MIN(T56)/MAX(T56)＜0.54；

wherein MIN (T56) is a minimum distance from an image side surface of the fifth lens element to an object side surface of the sixth lens element in a direction parallel to the optical axis, and MAX (T56) is a maximum distance from the image side surface of the fifth lens element to the object side surface of the sixth lens element in the direction parallel to the optical axis.

11. An optical lens group according to claim 1, characterized in that it satisfies the following relation:

|f1/CT1|+|f2/CT2|+|f3/CT3|+|f4/CT4|+|f5/CT5|+|f6/CT6|＞141；

wherein, f1 is the effective focal length of first lens, and f2 is the effective focal length of second lens, and f3 is the effective focal length of third lens, and f4 is the effective focal length of fourth lens, and f5 is the effective focal length of fifth lens, and f6 is the effective focal length of sixth lens, and CT1 is the thickness of first lens on the optical axis, and CT2 is the thickness of second lens on the optical axis, and CT3 is the thickness of third lens on the optical axis, and CT4 is the thickness of fourth lens on the optical axis, and CT5 is the thickness of fifth lens on the optical axis, and CT6 is the thickness of sixth lens on the optical axis.

12. An image capturing apparatus, comprising: an optical lens group according to any one of claims 1 to 11; and the photosensitive element is arranged on the image side of the optical lens group.

13. An electronic device, comprising: a housing; the image capturing device as claimed in claim 12, mounted on the housing.