CN212989749U - Optical imaging lens and electronic device - Google Patents

Abstract

The application discloses an optical imaging lens and electronic equipment, which comprise six lenses arranged in sequence from an object space to an image space along an optical axis, wherein the first lens has positive bending force, the object side surface is a convex surface at the optical axis, and the image side surface is a convex surface at the optical axis; the second lens has negative bending force; the third lens, the fourth lens, the fifth lens and the sixth lens all have bending force, and the ratio of the shortest distance ftLtl2 from the object side surface to the image side surface of the second lens to the longest distance ftGtl2 in parallel with the optical axis satisfies the following conditional expression: 0.1< ftLtl2/ftGtl2< 0.5. According to the six-piece type optical imaging lens, the object side surface, the image side surface shape, the distance and the focal power of the six lenses and the distance between the six lenses and the imaging surface of the optical imaging lens are reasonably distributed, so that the imaging performance is optimized, the miniaturization requirement of the optical imaging lens can be met, and the machinability and the forming yield of the optical imaging lens are improved.

Description

Optical imaging lens and electronic device

Technical Field

The present application relates to the field of optical systems, and in particular, to an optical imaging lens and an electronic device.

Background

With the wide application of mobile phones, tablet computers, unmanned planes, computers and other electronic products in life, various technological improvements are emerging. The improvement and innovation of the shooting effect of the camera lens of the electronic product becomes one of the focuses of people, and meanwhile, the improvement of science and technology becomes an important content, and whether a micro camera element can be used for shooting a picture with high painting quality, high resolution and high definition becomes a key factor for selecting the electronic product by modern people. In the related art, the performance of the photosensitive elements such as a photoelectric coupler CCD and a CMOS of an optical imaging system is gradually improved along with the technological progress, which provides possibility for shooting high-quality pictures and brings people with a shooting experience of higher picture quality. Therefore, miniaturization, assembly yield and performance improvement of the optical imaging system design become key issues for improving the shooting quality of the camera at present.

SUMMERY OF THE UTILITY MODEL

The application provides an optical imaging lens and electronic equipment considers optimizing optical imaging lens package assembly, satisfies optical imaging lens and electronic equipment's miniaturized design to satisfy the demand of shooing the definition.

In a first aspect, the present application provides an optical imaging lens, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are sequentially disposed along an optical axis from an object space to an image space, wherein the first lens has a positive refractive power, an object-side surface of the first lens is a convex surface at an optical axis, and an image-side surface of the first lens is a convex surface at the optical axis; the second lens has negative bending force; the third lens, the fourth lens, the fifth lens and the sixth lens all have bending force; the optical imaging lens satisfies: 0.1< ftLtl2/ftGtl2< 0.5; wherein: ftGtl2 is the longest distance from the object-side surface to the image-side surface of the second lens in the direction parallel to the optical axis; ftLtl2 is the shortest distance in the direction parallel to the optical axis from the object-side surface to the image-side surface of the second lens.

According to the optical imaging lens disclosed by the embodiment of the application, the first lens provides positive refractive power to converge light, so that object space light collection is facilitated, the second lens provides negative refractive power to correct position chromatic aberration caused by the first lens, and the positive and negative combination of the two lenses can effectively correct the position chromatic aberration and improve imaging definition. The ratio of the thickest part and the thinnest part of the second lens parallel to the optical axis is regulated to be within the range of 0.1-0.5, so that the processability and the forming yield of the second lens can be ensured, and the imaging stability is ensured. If ftLtl2/ftGtl2 is less than 0.1, the second lens is too thick near the optical axis with respect to the edge, which causes excessive curvature of the image plane field, and if ftLtl2/ftGtl2>0.5, the second lens is too thin near the optical axis with respect to the edge, which makes production and processing difficult and makes it difficult to ensure molding yield.

Optionally, the optical imaging lens is further provided with a diaphragm, and the conditional expression is satisfied: 0.5< DL/Imgh < 1; wherein, DL is the diameter of the effective aperture of the diaphragm, and Imgh is the image height corresponding to the maximum field angle of the optical imaging lens.

According to the optical imaging lens, the ratio range of DL to Imgh is controlled to be 0.5-1, so that the optical imaging lens has enough light transmission quantity, and the definition of a shot image is ensured. If DL/Imgh is greater than 1, the effective diameter of the diaphragm is too large, overexposure is caused, the brightness of the shot light is too high, and the picture quality is influenced; if DL/Imgh is less than 0.5, the effective diameter of the diaphragm is too small, resulting in insufficient light transmission and insufficient relative brightness of light, resulting in reduced screen sensitivity.

Optionally, the optical imaging lens further satisfies the conditional expression: -0.9< f1/f2< -0.4; wherein f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

According to the optical imaging lens disclosed by the embodiment of the application, the first lens provides positive refractive power to converge light, so that the collection of object light is facilitated, the second lens provides negative refractive power to correct the position chromatic aberration caused by the first lens, and the positive and negative combination of the two lenses can effectively correct the position chromatic aberration and improve the imaging definition, so that the ratio of the effective focal length of the first lens to the effective focal length of the second lens is controlled within the range of-0.9 to-0.4, so that the values of the refractive powers provided by the first lens and the second lens are reasonably matched, and the purpose of correcting the position chromatic aberration and improving the imaging definition is realized.

Optionally, the optical imaging lens further satisfies the conditional expression: 2< f/f1< 3; wherein f1 is the effective focal length of the first lens, and f is the effective focal length of the optical imaging lens.

According to the optical imaging lens, the ratio of the effective focal length of the first lens to the effective focal length of the optical imaging lens is regulated and controlled within a proper range, so that the aberration of the first lens is corrected conveniently; when f/f1 is more than or equal to 3, the optical imaging lens has too long effective focal length, which causes too large sensitivity of the optical imaging lens, increases difficulty of assembly process, increases difficulty of aberration correction generated by the first lens, and is difficult to meet shooting requirements; when f/f1 is less than or equal to 2, the effective focal length ratio of the first lens and the optical imaging lens is not proper, and the aberration generated by the first lens cannot be corrected.

Optionally, the optical imaging lens further satisfies the conditional expression: 1 mm < (R5 × R6)/(R5+ R6) <22 mm; wherein, R5 is a curvature radius of the object-side surface of the third lens element at the optical axis, and R6 is a curvature radius of the image-side surface of the third lens element at the optical axis.

According to the optical imaging lens disclosed by the embodiment of the application, the curvature radius of the object side surface and the curvature radius of the image side surface of the third lens are configured appropriately, the optical path difference between marginal rays and paraxial rays of an optical system can be balanced reasonably, the curvature of field and astigmatism can be corrected reasonably, the sensitivity of the system is reduced, and the assembly stability is improved.

Optionally, the optical imaging lens further satisfies the conditional expression: 0.1< SDL3/TD < 0.3; the SDL3 is an effective aperture radius of an object-side surface of the third lens element, and the TD is a distance from the object-side surface of the third lens element to an imaging surface of the optical imaging lens along an optical axis.

According to the optical imaging lens, the aperture of the object side surface of the third lens is used as optical internal light blocking, the angle of a light sensitive chip on an imaging surface can be increased, the light transmitted to the image side surface is enabled to be well matched with the light sensitive chip, the sensitivity of the optical imaging lens can be reduced by reducing the effective aperture of the third lens, and the assembly yield is improved. If SDL3/TD >0.3, the angle at which the light is incident on the photo-sensing chip will be too large to match the photo-sensing chip well. If the SDL3/TD is less than 0.1, the angle of light incident on the photosensitive chip is too small to be well matched with the photosensitive chip, and the effective aperture of the third lens is increased, so that the sensitivity of the optical imaging lens is increased, and the assembly yield is reduced.

Optionally, the optical imaging lens further satisfies the conditional expression: 0.1< air 3/TTL < 0.3; wherein airL3 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; TTL is the distance on the optical axis from the object side surface of the first lens element to the imaging surface of the optical imaging lens.

According to the optical imaging lens, the mounting positions of the third lens and the fourth lens are adjusted to be within a proper range, so that the miniaturization design of the optical imaging lens is met, and the forming yield is improved. Under the condition that air L3/TTL is more than 0.3, although the sensitivity requirement can be met, the total length of the whole optical imaging lens is too long, the miniaturization design of the whole optical imaging lens is not facilitated, and under the condition that air L3/TTL is less than 0.1, the system sensitivity is increased, so that the production yield is reduced.

Optionally, the optical imaging lens further satisfies the conditional expression: 0.7< TTL/f < 1; 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 imaging lens, and f is an effective focal length of the optical imaging lens.

According to the optical imaging lens of this application embodiment, through the effective focus of reasonable regulation and control optical imaging lens and optical imaging lens total length, can not only realize optical imaging lens miniaturization, can also guarantee that light is better assembles on the imaging surface. If TTL/f is less than or equal to 0.7, the optical length of the optical imaging lens is too short, the sensitivity of the optical imaging lens is increased, and the convergence of light on an imaging surface is not facilitated. If TTL/f is greater than or equal to 1, the optical length of the optical imaging lens is too long, which may cause too large angle of the chief ray of the light entering the imaging plane, and the light at the edge of the imaging plane of the optical imaging lens cannot be imaged on the photosensitive chip, resulting in incomplete imaging information.

Optionally, the optical imaging lens further satisfies the conditional expression: BFL/TTL is greater than 0.05; the BFL is a minimum distance from the image-side surface of the sixth lens element to the imaging surface of the optical imaging lens along the optical axis, and the TTL is a distance from the object-side surface of the first lens element to the imaging surface of the optical imaging lens along the optical axis.

According to the optical imaging lens, the optical imaging lens can be guaranteed to have a sufficient focusing range when the miniaturization of the optical imaging lens is met, the assembling yield of the optical imaging lens is improved, the focal depth of the optical imaging lens is guaranteed to be large, and more depth information of an object space can be acquired. If the BFL/TTL is less than 0.05, the assembly process tolerance is too small, which may result in too low yield and difficulty in the production process, and at the same time, may not ensure sufficient depth of focus of the optical imaging lens, resulting in poor imaging quality.

In a second aspect, the present application provides an electronic device, which includes the optical imaging lens as above, and further includes a housing, and the optical imaging lens is installed in the housing.

According to the six-piece type optical imaging lens, the object side surface, the image side surface shape, the distance and the focal power of the six lenses and the distance between the six lenses and the imaging surface of the optical imaging lens are reasonably distributed, so that the imaging performance is optimized, the miniaturization requirement of the optical imaging lens can be met, and the machinability and the forming yield of the optical imaging lens are improved.

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 diagram of an optical imaging lens according to an embodiment;

FIG. 2 is a longitudinal spherical aberration diagram, an astigmatic aberration diagram and a distortion curve diagram of the optical imaging lens according to the first embodiment;

FIG. 3 is a diagram showing the configuration of an optical imaging lens according to a second embodiment;

FIG. 4 is a longitudinal spherical aberration diagram, an astigmatic aberration diagram and a distortion curve of the optical imaging lens according to the second embodiment;

FIG. 5 is a view showing the configuration of an optical imaging lens according to a third embodiment;

FIG. 6 is a longitudinal spherical aberration diagram, an astigmatic aberration diagram and a distortion curve diagram of the optical imaging lens according to the third embodiment;

FIG. 7 is a diagram showing a configuration of an optical imaging lens in a fourth embodiment;

FIG. 8 is a longitudinal spherical aberration diagram, an astigmatic aberration diagram and a distortion curve diagram of the optical imaging lens according to the fourth embodiment;

FIG. 9 is a schematic diagram showing an optical imaging lens according to a fifth embodiment;

FIG. 10 is a longitudinal spherical aberration diagram, an astigmatic aberration diagram and a distortion curve diagram of the optical imaging lens according to the fifth embodiment;

FIG. 11 is a view showing the construction of an optical imaging lens in a sixth embodiment;

FIG. 12 is a longitudinal spherical aberration diagram, an astigmatic aberration diagram and a distortion curve diagram of an optical imaging lens according to a sixth embodiment;

FIG. 13 is a front view of an electronic device in an 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.

Referring to fig. 1, an optical imaging lens 100 provided in an embodiment of the present application includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6, which are sequentially disposed along an optical axis from an object side to an image side. The first lens element L1 has positive refractive power, the object-side surface of the first lens element L1 is convex at the optical axis, and the image-side surface thereof is convex at the optical axis, the second lens element L2 has negative refractive power, and the third lens element L3, the fourth lens element L4, the fifth lens element L5, and the sixth lens element L6 all have refractive power. In addition, the optical imaging lens 100 also satisfies the conditional expression (1).

(1)0.1<ftLtl2/ftGtl2<0.5

Wherein: ftGtl2 is the longest distance in the optical axis direction from the object-side surface to the image-side surface of the second lens L2; ftLtl2 is the shortest distance in the optical axis direction from the object-side surface to the image-side surface of the second lens L2.

According to the optical imaging lens 100 of the embodiment of the application, the first lens element provides positive refractive power to converge light, which is beneficial to collecting light in an object space, the second lens element provides negative refractive power to correct the position chromatic aberration caused by the first lens element, and the positive and negative combination of the two lens elements can effectively correct the position chromatic aberration and improve the imaging definition. The ratio of the thickest part and the thinnest part of the second lens parallel to the optical axis is regulated to be within the range of 0.1-0.5, so that the processability and the forming yield of the second lens can be ensured, and the imaging stability is ensured. If ftLtl2/ftGtl2 is less than 0.1, the second lens is too thick near the optical axis with respect to the edge, which causes excessive curvature of the image plane field, and if ftLtl2/ftGtl2>0.5, the second lens is too thin near the optical axis with respect to the edge, which makes production and processing difficult and makes it difficult to ensure molding yield.

It is understood that each lens includes an object-side surface facing the object side and an image-side surface facing the image side, the optical imaging lens 100 further includes an ir-cut filter L7 and an image plane E0 sequentially disposed along the optical axis from the object side to the image side, and the ir-cut filter L7 and the image plane E0 are both disposed on the image-side surface of the sixth lens L6. The object light passes through the object side surface of the first lens L1 to the image side surface, passes through each lens in sequence, is transmitted to the ir-cut filter L7, intercepts infrared light by the ir-cut filter L7, and is projected to the imaging surface of the optical imaging lens 100. The object-side surface of the first lens element L1 is convex along the optical axis, which is favorable for shortening the total optical length of the optical imaging lens assembly 100, and the image-side surface of the first lens element L1 is convex along the optical axis, which effectively eliminates the paraxial spherical aberration of the first lens element L1 and reduces the astigmatic field curvature. The second lens L2 has negative bending force, which is beneficial to compensating the phase difference generated by the first lens L1. By adjusting the surface shape structure of each lens and the optimal range combination of the optical parameters of each lens, the whole optical imaging lens 100 has better light converging capability, meets the requirement of high pixel, and effectively reduces the total length of the optical imaging lens 100, so that the optical imaging lens 100 is light and thin.

In addition, conditional expression (1) specifies a range of a ratio of the longest distance from the object-side surface of the second lens L2 to the image-side surface parallel to the optical axis to the shortest distance from the object-side surface of the second lens L2 to the image-side surface parallel to the optical axis, that is, a range of a thickness ratio of the second lens L2. By reducing the thickness of the lens at the paraxial axis, the optical path difference of the optical imaging system can be effectively balanced, and the function of correcting the field curvature is realized, but the paraxial axis of the lens is too thin and is difficult to meet the production and processing requirements, so that the forming yield is reduced, and meanwhile, the light rays at the paraxial axis and the marginal light rays of the lens are difficult to converge at one side where the image side surface is located due to the fact that the center of the lens is too thin or too thick, so that the field curvature is too large, therefore, the thickness ratio of the second lens L2 is regulated and controlled to meet the conditional expression (1), the processability and the forming yield of the second lens L2 can be ensured, and the imaging stability is ensured. If ftLtl2/ftGtl2 is less than 0.1, the second lens L2 is too thick near the optical axis with respect to the edge, which results in too large field curvature of the image plane E0, and if ftLtl2/ftGtl2>0.5, the second lens L2 is too thin near the optical axis with respect to the edge, which is not easy to produce and process, and thus, it is difficult to ensure the molding yield.

The optical imaging lens 100 is further provided with a diaphragm, which is an entity playing a role in limiting light beams in an optical system, and it can be an edge of a lens, a frame or a specially arranged screen with holes, and is used for limiting light beams or limiting the size of a field of view (imaging range) so as to reduce stray light and help to improve imaging quality. In the exemplary embodiment of the present application, the diaphragm is disposed at the boundary between the object-side surface of the first lens L1 and the mounting surface of the first lens L1, so that the effective diameter of the diaphragm is the effective diameter of the first lens L1, which does not cause the diaphragm to block light from the side where the object-side surface of the first lens L1 is located to reduce the effective diameter of the first lens L1, and also causes the diaphragm to be located at the mounting surface of the first lens L1 or the side where the image-side surface of the first lens L1 is located to fail to fully play a role of blocking light, thereby increasing the total length of the optical imaging lens 100.

In addition, the optical imaging lens 100 may also satisfy the conditional expression (2).

(2)0.5<DL/Imgh<1

Wherein DL is the diameter of the effective aperture of the diaphragm; imgh is an image height corresponding to the maximum field angle of the optical imaging lens 100.

The diaphragm is arranged on the first lens L1, the aperture size of the diaphragm determines the luminous flux size of the whole optical system, the size of the photosensitive chip on the imaging surface determines the picture definition and the pixel size of the whole camera system, and in the embodiment of the application, the ratio of DL to Imgh is controlled to meet the conditional expression (2), so that the optical imaging lens 100 has enough luminous flux, and the definition of a shot image is ensured. If DL/Imgh is greater than 1, the effective diameter of the diaphragm is too large, so that the exposure is too large, the brightness of the shot light is too high, and the picture quality is influenced; if DL/Imgh is less than 0.5, the effective diameter of the diaphragm is too small, resulting in insufficient light transmission and insufficient relative brightness of light, resulting in reduced screen sensitivity.

In an exemplary embodiment, the optical imaging lens 100 may also satisfy conditional expression (3).

(3)-0.9<f1/f2<-0.4

Wherein: f1 is the effective focal length of the first lens L1; f2 is the effective focal length of the second lens L2.

The first lens element L1 provides positive refractive power to converge light, which is beneficial to collecting light from an object, and the second lens element L2 provides negative refractive power to correct the positional chromatic aberration caused by the first lens element L1, and the positive and negative combinations of the two lens elements can effectively correct the positional chromatic aberration and improve the imaging resolution.

In an exemplary embodiment, the optical imaging lens 100 may further satisfy conditional expression (4).

(4)2<f/f1<3

Wherein: f1 is the effective focal length of the first lens L1; f is the effective focal length of the optical imaging lens 100.

The first lens L1 is mounted at the foremost end of the optical imaging lens 100, which is in contact with the object, and acquires all optical information of the optical imaging lens 100 from the object to the image, and the focal length of the first lens L1 determines the amount of optical information of the object acquired by the optical imaging lens 100. In this embodiment, the effective focal length of the first lens element L1 and the effective focal length of the optical imaging lens system 100 are controlled to satisfy the conditional expression (4), so that the two focal lengths can be properly matched, and the aberration of the first lens element L1 can be corrected conveniently; when f/f1 is greater than or equal to 3, the effective focal length of the optical imaging lens 100 is too long, which causes the sensitivity of the optical imaging lens 100 to be too large, increases the difficulty of the assembly process, increases the difficulty of aberration correction generated by the first lens L1, and is difficult to meet the shooting requirement; when f/f1 is less than or equal to 2, the effective focal length of the optical imaging lens 100 is too short or the effective focal length of the first lens L1 is too long, and the two are not properly matched, so that it is difficult to correct the aberration generated by the first lens L1.

In an exemplary embodiment, the optical imaging lens 100 may further satisfy conditional expression (5).

(5)1 mm < (R5R 6)/(R5+ R6) <22 mm

Wherein R5 is the radius of curvature of the object-side surface of the third lens L3 at the optical axis; r6 is the radius of curvature of the image-side surface of the third lens L3 at the optical axis.

In this embodiment, when the third lens element L3 is controlled to satisfy the conditional expression (5), the curvature radius of the object-side surface and the curvature radius of the image-side surface of the third lens element L3 are configured appropriately, so that the optical path difference between the marginal ray and the paraxial ray of the optical imaging lens 100 can be balanced at the middle section of the optical imaging lens 100, the curvature of field and the astigmatism can be corrected reasonably, the system sensitivity can be reduced, and the assembly stability can be improved.

In an exemplary embodiment, the optical imaging lens 100 may further satisfy conditional expression (6).

(6)0.1<SDL3/TD<0.3

Wherein, SDL3 is the effective aperture radius of the object side of the third lens L3; TD is the distance from the object side surface of the third lens element L3 to the image plane E0 of the optical imaging lens system 100 on the optical axis.

The conditional expression (6) specifies the range of the ratio of the effective aperture radius of the object-side surface of the third lens L3 to the distance on the optical axis from the object-side surface of the third lens L3 to the image plane E0 of the optical imaging lens 100. The aperture of the object side surface of the third lens L3 is used as an optical internal light blocking plate, so that the angle of light rays incident to the photosensitive chip on the imaging surface E0 can be increased, the light rays transmitted to the image side surface can be well matched with the photosensitive chip, the sensitivity of the optical imaging lens 100 can be reduced by reducing the effective aperture of the third lens L3, and the assembly yield can be improved. If SDL3/TD >0.3, the angle at which the light is incident on the photo-sensing chip will be too large to match the photo-sensing chip well. If the SDL3/TD is less than 0.1, the angle of light incident on the photosensitive chip is too small to be well matched with the photosensitive chip, and the effective aperture of the third lens L3 is increased, so that the sensitivity of the optical imaging lens 100 is increased, and the assembly yield is reduced.

In an exemplary embodiment, the optical imaging lens 100 may also satisfy conditional expression (7).

(7)0.1<airL3/TTL<0.3

Wherein: airL3 is the distance on the optical axis from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4; TTL is the distance on the optical axis from the object side surface of the first lens element L1 to the image plane of the optical imaging lens 100, i.e. the total length of the optical imaging lens 100.

The conditional expression (7) specifies a range of a ratio of a distance on the optical axis from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4 to the total length of the optical imaging lens 100. In the present embodiment, the distance between the image-side surface of the third lens element L3 and the object-side surface of the fourth lens element L4 on the optical axis and the total length of the optical imaging lens 100 are adjusted to satisfy the conditional expression (7), so that the sensitivity of the optical imaging lens 100 is reduced, and the assembly yield is improved. In the case of air L3/TTL >0.3, although the sensitivity requirement can be satisfied, the total length of the optical imaging lens 100 is too short to facilitate assembly, or the distance between the third lens L3 and the fourth lens L4 is too large to occupy the installation space, which is not favorable for better distributing the installation positions of the lenses; under the condition that air L3/TTL is less than 0.1, the distance between the image-side surface of the third lens element L3 and the fourth lens element L4 is too short or the total length of the optical imaging lens 100 is too long, and the ratio of the distance between the image-side surface of the third lens element L3 and the fourth lens element L4 is not suitable, which is not favorable for the miniaturization design of the whole optical imaging lens 100 and increases the system sensitivity to reduce the production yield.

In an exemplary embodiment, the optical imaging lens 100 may further satisfy conditional expression (8).

(8)0.7<TTL/f<1

Where f is the effective focal length of the optical imaging lens 100.

Through the effective focal length of reasonable regulation and control optical imaging lens 100 with the ratio of optical imaging lens 100 total length to 0.7 ~ 1 within range, can not only realize optical imaging lens 100 miniaturization, can also guarantee that light better assembles on imaging plane E0. When TTL/f is less than or equal to 0.7, the total length of the optical imaging lens 100 is too short, which increases the sensitivity of the optical imaging lens 100 and is not conducive to light convergence on the imaging plane E0; when TTL/f is greater than or equal to 1, the total length of the optical imaging lens 100 is too long, which may cause the angle of the chief ray of the light beam entering the imaging plane E0 to be too large, and further cause the light beam area transmitted to the imaging plane E0 to be too large, and the light beam at the edge of the imaging plane of the optical imaging lens 100 may not be imaged on the photo sensor chip, resulting in incomplete imaging information.

In an exemplary embodiment, the optical imaging lens 100 may further satisfy conditional expression (9).

(9)BFL/TTL>0.05

The BFL is a minimum distance from an image-side surface of the sixth lens L6 to the image plane E0 of the optical imaging lens 100 in the optical axis direction.

The light transmitted to the optical imaging lens 100 from the object is processed by the first lens L1 to the sixth lens L6 and the ir-cut filter L7 in sequence and then transmitted to the imaging plane E0, wherein the ir-cut filter L7 is only used for filtering infrared light and has no deflection effect on the light, so the structure of the sixth lens L6 determines the effective light area finally transmitted to the imaging plane E0 behind the optical imaging lens 100, in this embodiment, the conditional expression (9) specifies the ratio of the minimum distance BFL from the image side surface of the sixth lens L6 to the imaging plane E0 of the optical imaging lens 100 in the optical axis direction to the total length of the optical imaging lens 100, and the total length and BFL value of the optical imaging lens 100 are adjusted to adjust the depth of focus of the final optical imaging lens 100, so as to adjust the effective focal length of the optical imaging lens 100. When the optical imaging lens 100 satisfies the conditional expression (9), the optical imaging lens 100 can be ensured to have a sufficient focusing range while the miniaturization of the optical imaging lens 100 is satisfied, the assembly yield of the optical imaging lens 100 is improved, the optical imaging lens 100 is ensured to have a large focal depth, and more depth information of an object space can be acquired. If the BFL/TTL is less than 0.05, the assembly process tolerance is too small, which may result in too low yield and difficulty in the production process, and at the same time, it may not ensure sufficient depth of focus of the optical imaging lens 100, which may result in poor imaging quality.

In the optical imaging lens 100 provided by the technical scheme, the object side surface and the image side surface of each of the first lens L1 to the sixth lens L6 are aspheric mirrors, the aspheric mirrors are easy to manufacture into shapes other than spherical surfaces, and aberration can be reduced by changing various control parameters of the aspheric mirrors, so that the number of the lenses used is reduced, and the total length of the optical imaging lens 100 is effectively reduced.

The following describes a specific implementation of the structural arrangement of the optical imaging lens 100 and the corresponding implementation effect in combination with specific numerical values with reference to the drawings and tables.

The meanings of the symbols shown in the tables and the description are as follows.

S1, S3, S5, S7, S9, S11, and S13 are numbers of the first lens L1 to the sixth lens L6 and the infrared filter object side surface, respectively, S2, S4, S6, S8, S10, S12, and S14 are numbers of the first lens L1 to the sixth lens L6 and the infrared filter image side surface, respectively, and STO is a stop number.

"k" represents a Conic Constant (Constant), "a 4", "a 6", "A8", … … "and" a20 "represent aspheric coefficients of 4 th order, 6 th order, 8 th order, … … and 20 th order, respectively.

In each table showing conic constants and aspherical coefficients below, numerical values are expressed by an index with a base 10. For example, "0.12E-05" means "0.12 × (minus 5 powers of 10)", and "9.87E + 03" means "9.87 × (3 powers of 10)".

In the optical imaging lens 100 used in each embodiment, specifically, when the distance in the direction perpendicular to the optical axis is "h", the paraxial curvature at the lens origin is "c" (paraxial curvature c is the inverse of the upper lens curvature radius R, that is, c is 1/R), the conic constant is "k", and the aspherical coefficients of 4 th order, 6 th order, 8 th order, … …, and i th order are "a 4", "a 6", "a 8", … … ", and" Ai ", respectively, the aspherical shape x is defined by the following equation 1.

Mathematical formula 1:

example one

As shown in fig. 1, which is a schematic structural diagram of an optical imaging lens 100 according to an embodiment of the present disclosure, the optical imaging lens 100 includes a first lens L1 to a sixth lens L6, an ir-cut filter L7, and an image plane E0, which are sequentially disposed from an object side to an image side along an optical axis direction. The stop is coaxially disposed on the object side of the first lens L1. The incident light sequentially passes through the object-side surface, the image-side surface and the infrared filter of the first lens L1 to the sixth lens L6, and is finally imaged on the imaging surface E0. The first lens element L1 has positive refractive power, and both the object-side surface and the image-side surface thereof are convex at the optical axis; the second lens element L2 has negative refractive power, and the object-side surface and the image-side surface of the second lens element L3 have concave surfaces at the optical axis; the fourth lens element L4 has negative bending force, and has a concave object-side surface and a convex image-side surface; the fifth lens element L5 has positive refractive power, and has a convex object-side surface and a concave image-side surface; the sixth lens element L6 has negative refractive power, and has a concave object-side surface and a convex image-side surface.

In the first embodiment, the refractive index, abbe number and focal length of the optical imaging lens 100 are referenced to the light with the wavelength of 587.56nm, and the relevant parameters of the optical imaging lens 100 are shown in table 1. In table 1, EFL denotes an effective focal length of the optical imaging lens 100, fno denotes an aperture value, FOV denotes a diagonal field angle of the optical imaging lens 100, TTL denotes a distance on an optical axis from an object-side surface of the first lens L1 to an imaging surface of the optical system, and all units of the curvature radius, the thickness, and the focal length are mm.

TABLE 1

The aspherical surface coefficients of the aspherical surface in example one are shown in tables 2 and 3 together with the conic constant k.

TABLE 2

TABLE 3

Numbering	A12	A14	A16	A18	A20
						S1	2.254E-02	-1.434E-02	5.470E-03	-1.150E-03	1.000E-04
S2	-1.976E-01	1.347E-01	-5.713E-02	1.360E-02	-1.390E-03
						S3	-6.260E-01	5.675E-01	-3.165E-01	9.836E-02	-1.304E-02
S4	-2.213E+00	2.707E+00	-2.005E+00	8.209E-01	-1.408E-01
						S5	-9.809E-02	1.701E-01	-1.320E-01	4.877E-02	-6.950E-03
S6	-4.827E-01	4.909E-01	-2.825E-01	8.159E-02	-8.660E-03
						S7	1.751E-01	-4.024E-01	3.266E-01	-1.266E-01	1.950E-02
S8	1.559E-01	-2.540E-01	1.705E-01	-5.621E-02	7.440E-03
						S9	-2.993E-01	1.742E-01	-6.121E-02	1.198E-02	-1.000E-03
S10	-2.614E-01	1.357E-01	-4.197E-02	7.200E-03	-5.300E-04
						S11	-4.653E-02	1.597E-02	-2.960E-03	4.200E-04	-4.000E-05
S12	-3.152E-02	1.373E-02	-3.440E-03	5.100E-04	-3.000E-05

The ratio of the parameters of the optical imaging lens 100 in the first embodiment is shown in table 4.

TABLE 4

Wherein, TTL is the total length of the optical imaging lens 100, f is the effective focal length of the optical imaging lens 100, airL3 is the distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4 on the optical axis, SDL3 is the effective aperture radius of the object-side surface of the third lens L3, TD is the distance from the object-side surface of the third lens L3 to the imaging surface E0 of the optical imaging lens 100 on the optical axis, R5 is the radius of curvature of the object-side surface of the third lens L3, R6 is the radius of curvature of the object-side surface of the third lens L3, ftGtl2 is the longest distance from the object-side surface of the second lens L2 to the image-side surface parallel to the optical axis, ftLtl2 is the shortest distance from the object-side surface of the second lens L2 to the image-side surface parallel to the optical axis, BFL is the longest effective focal length of the sixth lens L6, f1 is the first lens L2, DL is the effective aperture diameter of the diaphragm.

According to the results in table 4, the numerical ratios in the first embodiment respectively satisfy the conditional expressions (1) to (9) in a one-to-one correspondence manner, that is, the optical imaging lens 100 provided in the first embodiment can achieve the purposes of convenient assembly and lens miniaturization.

Fig. 2 shows, from left to right, a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion diagram of the first embodiment.

The abscissa of the longitudinal spherical aberration diagram represents the focus offset, the ordinate represents the normalized field of view, and the spherical aberrations corresponding to the wavelengths respectively of 650.00nm, 610.00nm, 587.56nm, 510.00nm and 470.00nm given in the left diagram of fig. 2 are all within 1.000mm, which indicates that the optical imaging lens 100 in the embodiment has better imaging quality.

The abscissa of the astigmatic aberration diagram represents the focus offset, the ordinate represents the image height, and the astigmatism corresponding to the wavelength of 587.56nm given by the middle diagram of fig. 2 is within 2.04, so that the astigmatism is well compensated.

The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height, and the distortion curve corresponding to the wavelength of 587.56nm given by the right graph in fig. 2 shows that the distortion is better corrected.

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

Example two

As shown in fig. 3, which is a schematic structural diagram of an optical imaging lens 100 according to a second embodiment of the present disclosure, the optical imaging lens 100 includes a first lens L1 to a sixth lens L6, an ir-cut filter L7, and an image plane E0, which are sequentially disposed from an object side to an image side along an optical axis direction. The stop is coaxially disposed on the object side of the first lens L1. The incident light sequentially passes through the object-side surface, the image-side surface and the infrared filter of the first lens L1 to the sixth lens L6, and is finally imaged on the imaging surface E0. The first lens element L1 has positive refractive power, and both the object-side surface and the image-side surface are convex at the optical axis; the second lens element L2 has negative refractive power, and the object-side surface and the image-side surface of the second lens element L3 have concave surfaces at the optical axis; the fourth lens element L4 has positive refractive power, and has a concave object-side surface and a convex image-side surface; the fifth lens element L5 has positive refractive power, and has a concave object-side surface and a convex image-side surface; the sixth lens element L6 has negative refractive power, and has a concave object-side surface and a convex image-side surface.

In the second embodiment, the refractive index, abbe number and focal length of the optical imaging lens 100 are referenced to the light with the wavelength of 587.56nm, and the relevant parameters of the optical imaging lens 100 are shown in table 5. In table 5, EFL denotes an effective focal length of the optical imaging lens 100, fno denotes an aperture value, FOV denotes a diagonal field angle of the optical imaging lens 100, TTL denotes a distance on an optical axis from an object-side surface of the first lens L1 to an imaging surface of the optical system, and all the curvature radius, thickness, and focal length units are mm.

TABLE 5

The aspherical surface coefficients of the aspherical surfaces in example two are shown in tables 6 and 7 together with the conic constant k.

TABLE 6

Numbering	k	A4	A6	A8	A10
						S1	-1.695E+00	3.201E-02	-1.120E-03	5.870E-03	-8.250E-03
S2	-8.100E+01	-5.916E-02	1.108E-01	-1.290E-01	1.136E-01
						S3	-9.900E+01	-1.094E-01	2.164E-01	-2.223E-01	1.613E-01
S4	-4.279E+00	-6.014E-02	1.722E-01	-1.561E-01	1.320E-01
						S5	-4.473E+01	6.200E-03	2.099E-02	1.224E-01	-5.359E-01
S6	-2.028E+01	7.555E-02	3.001E-02	-8.167E-02	2.740E-01
						S7	-2.760E+01	-1.672E-02	2.339E-02	-2.171E-01	4.798E-01
S8	5.815E+01	4.641E-02	-2.637E-02	-1.691E-01	3.735E-01
						S9	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00
S10	-8.644E+00	7.464E-02	-1.203E-01	-3.570E-03	1.258E-01
						S11	-4.256E-02	1.317E-01	-2.304E-01	1.653E-01	-8.709E-02
S12	7.248E+00	4.155E-02	-1.082E-01	4.129E-02	1.605E-02

TABLE 7

As shown in table 8, the ratio of the parameters of the optical imaging lens 100 in the second embodiment is also shown.

TABLE 8

Item	Ratio of	Item	Numerical value
				(1)ftLtl2/ftGtl2	0.37	(6)SDL3/TD	0.25
(2)DL/Imgh	0.75	(7)airL3/TTL	0.15
				(3)f1/f2	-0.54	(8)TTL/f	0.88
(4)f/f1	2.58	(9)BFL/TTL	0.091
				(5)(R5*R6)/(R5+R6)	7.71

According to the results in table 8, the numerical ratios in the second embodiment respectively satisfy the conditional expressions (1) to (9) in a one-to-one correspondence manner, that is, the optical imaging lens 100 according to the second embodiment can achieve the purposes of convenient assembly and lens miniaturization.

Fig. 4 shows, from left to right, a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion curve diagram of the second embodiment.

The abscissa of the longitudinal spherical aberration diagram represents the focus offset, the ordinate represents the normalized field of view, and the spherical aberrations corresponding to the wavelengths respectively of 650.00nm, 610.00nm, 587.56nm, 510.00nm and 470.00nm given in the left diagram of fig. 4 are all within 1.000mm, which indicates that the optical imaging lens 100 in the embodiment has better imaging quality.

The abscissa of the astigmatic aberration diagram represents the focus offset, the ordinate represents the image height, and the astigmatism corresponding to the wavelength of 587.56nm given by the middle diagram of fig. 4 is within 2.04, so that the astigmatism is well compensated.

The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height, and the distortion curve corresponding to the wavelength of 587.56nm given by the right graph in fig. 4 shows that the distortion is better corrected.

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

EXAMPLE III

As shown in fig. 5, which is a schematic structural diagram of an optical imaging lens 100 according to a third embodiment of the present disclosure, the optical imaging lens 100 includes a first lens L1 to a sixth lens L6, an ir-cut filter L7, and an image plane E0, which are sequentially disposed from an object side to an image side along an optical axis direction. The stop is coaxially disposed on the object side of the first lens L1. The incident light sequentially passes through the object-side surface, the image-side surface and the infrared filter of the first lens L1 to the sixth lens L6, and is finally imaged on the imaging surface E0. The first lens element L1 has positive refractive power, and both the object-side surface and the image-side surface are convex at the optical axis; the second lens element L2 has negative refractive power, and both the object-side surface and the image-side surface thereof are concave at the optical axis; the third lens element L3 has negative refractive power, and both the object-side surface and the image-side surface thereof are concave at the optical axis; the fourth lens element L4 has positive refractive power, and has a concave object-side surface and a convex image-side surface; the fifth lens element L5 has negative bending force, and has a convex object-side surface and a concave image-side surface; the sixth lens element L6 has negative refractive power, and has a concave object-side surface and a convex image-side surface.

In the third embodiment, the refractive index, abbe number and focal length of the optical imaging lens 100 are referenced to the light with the wavelength of 587.56nm, and the relevant parameters of the optical imaging lens 100 are shown in table 9. In table 9, EFL denotes an effective focal length of the optical imaging lens 100, fno denotes an aperture value, FOV denotes a diagonal field angle of the optical imaging lens 100, TTL denotes a distance on the optical axis from the object-side surface of the first lens L1 to the imaging surface of the optical system, and the curvature radius, thickness, and focal length are all mm.

TABLE 9

The aspherical surface coefficients of the aspherical surfaces in example three are shown in tables 10 and 11 together with the conic constant k.

Watch 10

Numbering	k	A4	A6	A8	A10
						S1	-1.728E+00	3.110E-02	-6.600E-04	4.110E-03	-4.830E-03
S2	-7.182E+01	-6.464E-02	1.267E-01	-1.567E-01	1.448E-01
						S3	-9.900E+01	-1.018E-01	2.118E-01	-2.450E-01	2.120E-01
S4	-4.200E+00	-4.458E-02	1.436E-01	-1.575E-01	1.964E-01
						S5	-1.578E+01	-6.901E-02	1.349E-01	-1.945E-01	4.823E-01
S6	-5.545E+01	-4.400E-03	9.585E-02	-2.341E-01	7.681E-01
						S7	3.116E+01	-1.506E-02	9.788E-02	-3.349E-01	4.132E-01
S8	-9.900E+01	4.072E-02	1.046E-01	-3.146E-01	3.432E-01
						S9	-2.962E+01	5.500E-02	-1.532E-01	2.507E-01	-2.479E-01
S10	5.350E+00	5.130E-03	-2.094E-01	3.555E-01	-3.544E-01
						S11	1.441E+00	7.123E-02	-2.146E-01	1.425E-01	-2.778E-02
S12	7.198E+00	3.640E-02	-1.251E-01	5.356E-02	1.181E-02

TABLE 11

As shown in table 12, the ratio of the parameters of the optical imaging lens 100 in the third embodiment is also shown.

TABLE 12

Item	Ratio of	Item	Numerical value
				(1)ftLtl2/ftGtl2	0.46	(6)SDL3/TD	0.26
(2)DL/Imgh	0.75	(7)airL3/TTL	0.17
				(3)f1/f2	-0.52	(8)TTL/f	0.88
(4)f/f1	2.54	(9)BFL/TTL	0.065
				(5)(R5*R6)/(R5+R6)	12.86

According to the results in table 12, the numerical ratios in the third embodiment respectively satisfy the conditional expressions (1) to (9) in a one-to-one correspondence manner, that is, the optical imaging lens 100 provided in the third embodiment can achieve the purposes of convenient assembly and lens miniaturization.

Fig. 6 is a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion curve diagram of the third embodiment from left to right.

The abscissa of the longitudinal spherical aberration diagram represents the focus offset, the ordinate represents the normalized field of view, and the spherical aberrations corresponding to the wavelengths respectively of 650.00nm, 610.00nm, 587.56nm, 510.00nm and 470.00nm given in the left diagram of fig. 6 are all within 1.000mm, which indicates that the optical imaging lens 100 in the embodiment has better imaging quality.

The abscissa of the astigmatic aberration diagram represents the focus offset, the ordinate represents the image height, and the astigmatism corresponding to the wavelength of 587.56nm given by the middle diagram of fig. 6 is within 2.04, so that the astigmatism is well compensated.

The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height, and the distortion curve corresponding to the wavelength of 587.56nm given by the right graph in fig. 6 shows that the distortion is better corrected.

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

Example four

As shown in fig. 7, which is a schematic structural diagram of an optical imaging lens 100 according to a fourth embodiment of the present disclosure, the optical imaging lens 100 includes a first lens L1 to a sixth lens L6, an ir-cut filter L7, and an image plane E0, which are sequentially disposed from an object side to an image side along an optical axis direction. The stop is coaxially disposed on the object side of the first lens L1. The incident light sequentially passes through the object-side surface, the image-side surface and the infrared filter of the first lens L1 to the sixth lens L6, and is finally imaged on the imaging surface E0. The first lens element L1 has positive refractive power, and both the object-side surface and the image-side surface are convex at the optical axis; the second lens element L2 has negative refractive power, and both the object-side surface and the image-side surface thereof are concave at the optical axis; the third lens element L3 has negative refractive power, and both the object-side surface and the image-side surface thereof are concave at the optical axis; the fourth lens element L4 has negative bending force, and has a concave object-side surface and a convex image-side surface; the fifth lens element L5 has negative bending force, and has a convex object-side surface and a concave image-side surface; the sixth lens element L6 has negative refractive power, and has a concave object-side surface and a convex image-side surface.

In the fourth embodiment, the refractive index, abbe number and focal length of the optical imaging lens 100 are based on the light with the wavelength of 587.56nm, and the relevant parameters of the optical imaging lens 100 are shown in table 13. In table 13, EFL denotes an effective focal length of the optical imaging lens 100, fno denotes an aperture value, FOV denotes a diagonal field angle of the optical imaging lens 100, TTL denotes a distance on the optical axis from the object-side surface of the first lens L1 to the imaging surface of the optical system, and the curvature radius, thickness, and focal length are all mm.

Watch 13

The aspherical surface coefficients of the aspherical surfaces in example four are shown in tables 14 and 15 together with the conic constant k.

TABLE 14

Numbering	k	A4	A6	A8	A10
						S1	-1.784E+00	2.918E-02	-2.960E-03	8.920E-03	-1.380E-02
S2	-8.869E+01	-2.851E-02	4.668E-02	-5.926E-02	6.725E-02
						S3	9.900E+01	-7.147E-02	1.160E-01	-1.273E-01	1.598E-01
S4	-4.069E+00	-4.474E-02	1.342E-01	-2.127E-01	4.402E-01
						S5	-1.485E+00	-1.542E-02	-7.993E-02	3.892E-01	-8.781E-01
S6	-8.403E+01	3.639E-02	-1.120E-01	4.697E-01	-1.127E+00
						S7	-3.490E+01	-1.300E-01	4.661E-01	-1.042E+00	1.329E+00
S8	-3.832E+01	2.833E-02	1.235E-01	-2.384E-01	1.423E-01
						S9	2.142E+01	8.815E-02	-4.530E-01	9.019E-01	-1.089E+00
S10	-8.599E+01	4.256E-02	-3.237E-01	5.154E-01	-4.900E-01
						S11	5.846E+00	1.356E-01	-3.298E-01	3.321E-01	-2.756E-01
S12	7.699E+00	8.541E-02	-1.628E-01	8.698E-02	-3.239E-02

Watch 15

As shown in table 16, the ratio of the parameters of the optical imaging lens 100 in the fourth embodiment is also shown.

TABLE 16

Item	Ratio of	Item	Numerical value
				(1)ftLtl2/ftGtl2	0.40	(6)SDL3/TD	0.27
(2)DL/Imgh	0.75	(7)airL3/TTL	0.17
				(3)f1/f2	-0.67	(8)TTL/f	0.88
(4)f/f1	2.44	(9)BFL/TTL	0.081
				(5)(R5*R6)/(R5+R6)	12.67

According to the results in table 16, it is found that the numerical ratios in the fourth embodiment respectively satisfy the conditional expressions (1) to (9) in a one-to-one correspondence manner, that is, the optical imaging lens 100 provided in the fourth embodiment can achieve the purposes of convenient assembly and lens miniaturization.

Fig. 8 shows, from left to right, a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion diagram of the fourth embodiment.

The abscissa of the longitudinal spherical aberration diagram represents the focus offset, the ordinate represents the normalized field of view, and the spherical aberrations corresponding to the wavelengths respectively of 650.00nm, 610.00nm, 587.56nm, 510.00nm and 470.00nm given in the left diagram of fig. 8 are all within 1.000mm, which indicates that the optical imaging lens 100 in the embodiment has better imaging quality.

The abscissa of the astigmatic aberration diagram represents the focus offset, the ordinate represents the image height, and the astigmatism corresponding to the wavelength of 587.56nm given by the middle diagram of fig. 2 is within 2.04, so that the astigmatism is well compensated.

The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height, and the distortion curve corresponding to the wavelength of 587.56nm given by the right graph in fig. 8 shows that the distortion is better corrected.

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

EXAMPLE five

As shown in fig. 9, which is a schematic structural diagram of an optical imaging lens 100 in the fifth embodiment of the present application, the optical imaging lens 100 includes a first lens L1 to a sixth lens L6, an ir-cut filter L7, and an image plane E0, which are sequentially disposed from an object side to an image side along an optical axis direction. The stop is coaxially disposed on the object side of the first lens L1. The incident light sequentially passes through the object-side surface, the image-side surface and the infrared filter of the first lens L1 to the sixth lens L6, and is finally imaged on the imaging surface E0. The first lens element L1 has positive refractive power, and both the object-side surface and the image-side surface are convex at the optical axis; the second lens element L2 has negative refractive power, and both the object-side surface and the image-side surface thereof are concave at the optical axis; the third lens element L3 has negative refractive power, and both the object-side surface and the image-side surface thereof are concave at the optical axis; the fourth lens element L4 has positive refractive power, and has a concave object-side surface and a convex image-side surface; the fifth lens element L5 has negative bending force, and has a convex object-side surface and a concave image-side surface; the sixth lens element L6 has negative refractive power, and has a concave object-side surface and a convex image-side surface.

In the fifth embodiment, the refractive index, abbe number and focal length of the optical imaging lens 100 are determined by referring to the light with the wavelength of 587.56nm, and the relevant parameters of the optical imaging lens 100 are shown in table 17. In table 17, EFL denotes an effective focal length of the optical imaging lens 100, fno denotes an aperture value, FOV denotes a diagonal field angle of the optical imaging lens 100, TTL denotes a distance on the optical axis from the object-side surface of the first lens L1 to the imaging surface of the optical system, and the curvature radius, thickness, and focal length are all mm.

TABLE 17

The aspherical surface coefficients of the aspherical surfaces in example five are shown in tables 18 and 19 together with the conic constant k.

Watch 18

Watch 19

Numbering	A12	A14	A16	A18	A20
						S1	1.193E-02	-7.280E-03	2.680E-03	-5.400E-04	5.000E-05
S2	-4.369E-02	2.597E-02	-9.820E-03	2.080E-03	-1.900E-04
						S3	-1.476E-01	1.199E-01	-6.220E-02	1.811E-02	-2.230E-03
S4	-1.993E-01	-1.028E-01	3.645E-01	-2.877E-01	7.893E-02
						S5	1.195E+00	-1.139E+00	6.305E-01	-1.844E-01	2.204E-02
S6	1.593E+00	-1.564E+00	8.956E-01	-2.749E-01	3.505E-02
						S7	-1.582E+00	7.983E-01	-1.544E-01	-3.143E-02	1.374E-02
S8	1.247E-01	-2.845E-01	2.118E-01	-7.429E-02	1.025E-02
						S9	8.533E-01	-4.249E-01	1.292E-01	-2.172E-02	1.540E-03
S10	2.797E-01	-1.002E-01	1.975E-02	-1.700E-03	2.000E-05
						S11	2.052E-01	-1.004E-01	3.173E-02	-5.680E-03	4.300E-04
S12	2.525E-02	-1.794E-02	6.770E-03	-1.250E-03	9.000E-05

As shown in table 20, the ratio of the parameters of the optical imaging lens 100 in the fifth embodiment is also shown.

Watch 20

According to the results in table 20, the numerical ratios in the fifth embodiment respectively satisfy the conditional expressions (1) to (9) in a one-to-one correspondence manner, that is, the optical imaging lens 100 according to the fifth embodiment can achieve the purposes of convenient assembly and lens miniaturization.

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

The abscissa of the longitudinal spherical aberration diagram represents the focus offset, the ordinate represents the normalized field of view, and the spherical aberrations corresponding to the wavelengths respectively of 650.00nm, 610.00nm, 587.56nm, 510.00nm and 470.00nm given in the left diagram of fig. 10 are all within 1.000mm, which indicates that the optical imaging lens 100 in the embodiment has better imaging quality.

The abscissa of the astigmatic aberration diagram represents the focus offset, the ordinate represents the image height, and the astigmatism corresponding to the wavelength of 587.56nm given by the middle diagram of fig. 10 is within 2.04, so that the astigmatism is well compensated.

The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height, and the distortion curve corresponding to the wavelength of 587.56nm given by the right graph in fig. 10 shows that the distortion is better corrected.

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

EXAMPLE six

As shown in fig. 11, which is a schematic structural diagram of an optical imaging lens 100 in the sixth embodiment of the present application, the optical imaging lens 100 includes a first lens L1 to a sixth lens L6, an ir-cut filter L7, and an image plane E0, which are sequentially disposed from an object side to an image side along an optical axis direction. The stop is coaxially disposed on the object side of the first lens L1. The incident light sequentially passes through the object-side surface, the image-side surface and the infrared filter of the first lens L1 to the sixth lens L6, and is finally imaged on the imaging surface E0. The first lens element L1 has positive refractive power, and both the object-side surface and the image-side surface are convex at the optical axis; the second lens element L2 has negative refractive power, and has a convex object-side surface and a concave image-side surface; the third lens element L3 has positive refractive power, and has a convex object-side surface and a concave image-side surface; the fourth lens element L4 has positive refractive power, and has a concave object-side surface and a convex image-side surface; the fifth lens element L5 has negative bending force, and has a convex object-side surface and a concave image-side surface; the sixth lens element L6 has positive refractive power, and has a concave object-side surface and a convex image-side surface.

In the sixth embodiment, the refractive index, abbe number and focal length of the optical imaging lens 100 are referenced to the light with the wavelength of 587.56nm, and the relevant parameters of the optical imaging lens 100 are shown in table 21. In table 21, EFL denotes an effective focal length of the optical imaging lens 100, fno denotes an aperture value, FOV denotes a diagonal field angle of the optical imaging lens 100, TTL denotes a distance on the optical axis from the object-side surface of the first lens L1 to the imaging surface of the optical system, and all the curvature radius, thickness, and focal length units are mm.

TABLE 21

The aspherical surface coefficients of the aspherical surfaces in the sixth embodiment are shown in tables 22 and 23 together with the conic constant k.

TABLE 22

TABLE 23

Numbering	A12	A14	A16	A18	A20
						S1	4.910E-03	-2.610E-03	7.400E-04	-8.000E-05	0.000E+00
S2	-6.156E-02	3.207E-02	-1.049E-02	1.920E-03	-1.500E-04
						S3	-2.356E-01	1.254E-01	-3.939E-02	5.520E-03	-2.000E-05
S4	1.456E+00	-2.847E+00	2.944E+00	-1.600E+00	3.594E-01
						S5	2.771E+00	-2.222E+00	1.091E+00	-2.944E-01	3.350E-02
S6	4.543E+00	-3.578E+00	1.657E+00	-4.036E-01	3.921E-02
						S7	-8.314E+00	5.115E+00	-1.362E+00	-1.269E-01	1.076E-01
S8	1.807E-01	-6.734E-01	5.977E-01	-2.410E-01	3.779E-02
						S9	3.307E+00	-2.112E+00	8.434E-01	-1.900E-01	1.834E-02
S10	9.603E-01	-5.080E-01	1.659E-01	-3.002E-02	2.280E-03
						S11	-2.339E-02	-3.138E-02	2.213E-02	-5.570E-03	5.200E-04
S12	-1.537E-01	7.373E-02	-2.133E-02	3.440E-03	-2.400E-04

As shown in table 24, the ratio of the parameters of the optical imaging lens 100 in the sixth embodiment is also shown.

Watch 24

Item	Ratio of	Item	Numerical value
				(1)ftLtl2/ftGtl2	0.23	(6)SDL3/TD	0.27
(2)DL/Imgh	0.75	(7)airL3/TTL	0.17
				(3)f1/f2	-0.78	(8)TTL/f	0.88
(4)f/f1	2.31	(9)BFL/TTL	0.063
				(5)(R5*R6)/(R5+R6)	1.64

According to the results in table 24, the numerical ratios in the sixth embodiment respectively satisfy the conditional expressions (1) to (9) in a one-to-one correspondence manner, that is, the optical imaging lens 100 according to the sixth embodiment can achieve the purposes of convenient assembly and lens miniaturization.

Fig. 12 shows, from left to right, a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion diagram of the sixth embodiment.

The abscissa of the longitudinal spherical aberration diagram represents the focus offset, the ordinate represents the normalized field of view, and the spherical aberrations corresponding to the wavelengths respectively of 650.00nm, 610.00nm, 587.56nm, 510.00nm and 470.00nm given in the left diagram of fig. 12 are all within 1.000mm, which indicates that the optical imaging lens 100 in the embodiment has better imaging quality.

The abscissa of the astigmatic aberration diagram represents the focus offset, the ordinate represents the image height, and the astigmatism corresponding to the wavelength of 587.56nm given by the middle diagram of fig. 12 is within 2.04, so that the astigmatism is well compensated.

The abscissa of the distortion curve graph represents the distortion rate, and the ordinate represents the image height, and the distortion curve corresponding to the wavelength of 587.56nm given by the right graph in fig. 12 shows that the distortion is better corrected.

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

The application also provides an electronic device, which can be a stand-alone imaging device such as a digital camera, or an imaging module integrated on a mobile device such as a mobile phone, a tablet computer, and the like. As shown in fig. 13, the electronic apparatus has a housing 200, the optical imaging lens 100 is mounted in the housing 200, and the optical imaging lens 100 is exposed from the housing 200 to acquire an image.

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 (10)

1. An optical imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged along an optical axis from an object space to an image space in sequence,

the first lens has positive bending force, the object side surface of the first lens is a convex surface at the optical axis, and the image side surface of the first lens is a convex surface at the optical axis;

the second lens has a negative bending force;

the third lens, the fourth lens, the fifth lens and the sixth lens all have a bending force;

the optical imaging lens satisfies: 0.1< ftLtl2/ftGtl2< 0.5;

wherein: ftGtl2 is the longest distance from the object-side surface to the image-side surface of the second lens in the optical axis direction; ftLtl2 is the shortest distance from the object-side surface to the image-side surface of the second lens in the optical axis direction.

2. The optical imaging lens of claim 1, wherein the optical imaging lens is further provided with a diaphragm, and the conditional expression is satisfied:

0.5<DL/Imgh<1；

and DL is the diameter of the effective aperture of the diaphragm, and Imgh is the image height corresponding to the maximum field angle of the optical imaging lens.

3. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies the conditional expression: -0.9< f1/f2< -0.4;

wherein f1 is the first lens effective focal length, and f2 is the second lens effective focal length.

4. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies the conditional expression: 2< f/f1< 3;

wherein f1 is the effective focal length of the first lens, and f is the effective focal length of the optical imaging lens.

5. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies the conditional expression: 1 mm < (R5 × R6)/(R5+ R6) <22 mm;

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.

6. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies the conditional expression: 0.1< SDL3/TD < 0.3;

the SDL3 is a radius of an effective aperture of an object-side surface of the third lens element, and the TD is a distance from the object-side surface of the third lens element to an imaging surface of the optical imaging lens along the optical axis.

7. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies the conditional expression: 0.1< air 3/TTL < 0.3;

wherein airL3 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; 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 imaging lens.

8. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies the conditional expression: 0.7< TTL/f < 1;

wherein, TTL is a distance from the object-side surface of the first lens element to the imaging surface of the optical imaging lens on the optical axis, and f is the effective focal length of the optical imaging lens.

9. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies the conditional expression: BFL/TTL is greater than 0.05;

the BFL is a minimum distance from the image-side surface of the sixth lens element to the imaging surface of the optical imaging lens along the optical axis, and the TTL is a distance from the object-side surface of the first lens element to the imaging surface of the optical imaging lens along the optical axis.

10. An electronic device, characterized in that,

comprising an optical imaging lens according to any one of claims 1 to 9;

the optical imaging lens is arranged in the shell.

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