CN111856718A

CN111856718A - Optical imaging lens, camera module and electronic equipment

Info

Publication number: CN111856718A
Application number: CN202010834268.0A
Authority: CN
Inventors: 杨懿; 刘秀; 蔡雄宇
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Tianjin OFilm Opto Electronics Co Ltd
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2020-10-30

Abstract

The application discloses optical imaging lens, camera module and electronic equipment, optical imaging lens includes first mirror group, second mirror group and third mirror group, first mirror group includes at least one lens, first mirror group has negative refractive power, the object side face of first mirror group is the convex surface in paraxial region department, the image side face of first mirror group is the concave surface in paraxial region department, second mirror group includes at least one lens, second mirror group has positive refractive power, the object side face of second mirror group is the convex surface in paraxial region department, the image side face of second mirror group is the convex surface in paraxial region department, third mirror group includes at least one lens, third mirror group has positive refractive power, the object side face of third mirror group is the convex surface in paraxial region department. By designing the optical imaging lens consisting of the first lens group, the second lens group and the third lens group and reasonably configuring the refractive power and the surface shapes of the first lens group, the optical imaging lens has good optical performance, can well capture the detailed characteristics of a shot object, and keeps miniaturization and light weight.

Description

Optical imaging lens, camera module and electronic equipment

Technical Field

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

Background

With the rise of the around-the-sight camera, the ADAS (Advanced Driving Assistance System) and the unmanned Driving market, the vehicle-mounted lens is increasingly applied to the automobile Driving Assistance System. Meanwhile, people also put higher demands on the aspects of imaging quality, picture comfort and the like of the vehicle-mounted lens. In order to obtain a larger field angle, the existing vehicle-mounted lens is often assembled by matching a plurality of lenses, so that the vehicle-mounted lens is larger in size.

Disclosure of Invention

The embodiment of the application provides an optical imaging lens, camera module and electronic equipment, can reduce lens quantity, keeps optical imaging lens's miniaturization and lightweight, has good optical performance simultaneously.

In a first aspect, an embodiment of the present application provides an optical imaging lens, including: the first lens group comprises at least one lens, the first lens group has negative refractive power, the object side surface of the first lens group is a convex surface at a paraxial region, the image side surface of the first lens group is a concave surface at a paraxial region, the second lens group comprises at least one lens, the second lens group has positive refractive power, the object side surface of the second lens group is a convex surface at a paraxial region, the image side surface of the second lens group is a convex surface at a paraxial region, the third lens group comprises at least one lens, the third lens group has positive refractive power, and the object side surface of the third lens group is a convex surface at a paraxial region.

Based on the optical imaging lens of the embodiment of the application, the optical imaging lens has good optical performance by reasonably configuring the refractive power of the first lens group, the second lens group and the third lens group and the surface shapes of the first lens group, the second lens group and the third lens group, can well capture the detailed characteristics of a shot object, does not increase the number of lenses in the optical imaging lens, and keeps the miniaturization and the light weight of the optical imaging lens.

In some embodiments, the maximum field angle of the optical imaging lens is FOV, the effective focal length of the optical imaging lens is f, and the FOV and f satisfy the following conditional expression: 110deg/mm < FOV/f.

Based on the above-described embodiment, by designing the relationship between the maximum field angle FOV of the optical imaging lens and the effective focal length f of the optical imaging lens to satisfy the conditional expression: 110deg/mm < FOV/f, so that the optical system can provide a field angle exceeding 170 degrees, the frame viewing range is effectively improved, the effective focal length of the optical system is not too small, a larger viewing range is accommodated, a shot object at a longer distance can be clearly imaged, the capturing capability of the optical system on low-frequency details is improved, and the shooting requirement of high image quality can be met. When the relationship between the two parameters does not satisfy the conditional expression, the viewing range and the imaging quality of the optical system are difficult to be considered, and the use requirement cannot be well satisfied.

In some embodiments, the combined focal length of the first lens group is f10, the effective focal length of the optical imaging lens is f, and f10 and f satisfy the following conditional expressions: -2 < f10/f < -1.

Based on the above-described embodiment, by designing the relationship between the combined focal length f10 of the first lens group and the effective focal length f of the optical imaging lens so as to satisfy the conditional expression: -2 < f10/f < -1, so that the focal length of the first lens group near the object side of the optical system in the optical imaging lens is designed to be negative, thereby providing negative refractive power for the optical system, and capturing light incident on the optical system at a large angle, so that the optical imaging lens has the characteristics of wide viewing angle, low optical performance sensitivity and miniaturization. When the relationship between the above two parameters does not satisfy the above conditional expression, it is difficult to make the optical imaging lens have a wide angle of view and low optical performance sensitivity while keeping miniaturization.

In some embodiments, the distance on the optical axis from the object-side surface of the first lens group to the image plane of the optical system is TTL, the effective focal length of the optical imaging lens is f, and TTL and f satisfy the following conditional expressions: TTL/f is less than 14.

Based on the above embodiment, the relationship between the distance TTL on the optical axis from the object side surface of the first lens group to the imaging surface of the optical system and the effective focal length f of the optical imaging lens is designed to satisfy the conditional expression: TTL/f is less than 14, so that the optical imaging lens has a larger effective focal length, and the total length of each lens in the optical imaging lens can be effectively reduced, thereby being beneficial to realizing the miniaturization of the optical imaging lens. When the relationship between the two parameters does not satisfy the conditional expression, the total length of each lens in the optical imaging lens is too long, which is not beneficial to realizing the miniaturization of the optical imaging lens.

In some embodiments, the combined focal length of the first lens group and the second lens group is f12, the combined focal length of the third lens group is f30, and f12 and f30 satisfy the following conditional expressions: 1 < f12/f30 < 3.

Based on the above-described embodiment, by designing the relationship between the combined focal length f12 of the first and second lens groups and the combined focal length f30 of the third lens group so as to satisfy the conditional expression: f12/f30 is more than 1 and less than 3, so that the ratio relation among the first lens group, the second lens group and the third lens group is reasonably configured, the optical performance sensitivity of each lens in the optical imaging lens is ensured to be in a balanced state, the total length of the optical imaging lens is reduced, and the aberration during imaging is favorably corrected. When the relationship between the two parameters does not satisfy the above conditional expression, the optical performance sensitivity and the overall length of each lens in the optical imaging lens are difficult to be compatible, which is not favorable for aberration correction.

In some embodiments, the distance on the optical axis from the object-side surface of the first lens group to the imaging surface of the optical system is TTL, the sum of the air spaces on the optical axis of the lenses of the optical imaging lens is Σ AT, and TTL and Σ AT satisfy the following conditional expressions: TTL/SIGMA AT < 5.

Based on the above embodiment, the relationship between the distance TTL on the optical axis from the object side surface of the first lens group to the imaging surface of the optical system and the sum Σ AT of the air spaces on the optical axis of each lens element of the optical imaging lens is designed to satisfy the conditional expression: TTL/SIGMA AT < 5, thus, the ratio relation between the total length of the optical imaging lens and the air space of each lens on the optical axis is reasonably configured, the air space of each lens on the optical axis can be reduced in a processing range, and the total length of the optical imaging lens is further reduced, thereby reducing the volume of an optical system. When the relationship between the two parameters does not satisfy the conditional expression, the air interval of each lens on the optical axis in the optical imaging lens is too small, the optical performance sensitivity of the lens is increased, the assembly is not facilitated, and the processing difficulty is increased.

In some embodiments, the effective focal length of the optical imaging lens is f, the entrance pupil diameter of the optical imaging lens is EPD, and f and EPD satisfy the following conditional expression: f/EPD < 1.6.

Based on the above-described embodiment, by designing the relationship between the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens to satisfy the conditional expression: the f/EPD is less than 1.6, so that the ratio relation between the effective focal length of the optical imaging lens and the entrance pupil diameter of the optical imaging lens is reasonably configured, the characteristic of wide angle is realized under the condition that the optical system has a large aperture and a small overall length, and the shooting effect of high definition and wide angle is further realized. When the relationship between the two parameters does not satisfy the above conditional expression, it is difficult for the optical system to obtain a sufficient amount of light flux in a dark environment, and the brightness during imaging is insufficient, resulting in poor imaging quality.

In some embodiments, the distance from the object-side surface of the first lens group to the imaging surface of the optical system on the optical axis is TTL, half of the maximum field angle of the optical imaging lens corresponding to the image height is ImgH, and TTL and ImgH satisfy the following conditional expressions: TTL/(ImgH 2) < 5.5.

Based on the above embodiment, the relationship between the distance TTL between the object side surface of the first lens group and the imaging surface of the optical system on the optical axis and the half ImgH of the maximum field angle corresponding image height of the optical imaging lens is designed to satisfy the conditional expression: TTL/(ImgH 2) < 5.5, so that the reasonable distribution of the thickness of each lens in the optical imaging lens can be kept under the condition of compressing the total length of the optical imaging lens and making the structure of the optical imaging lens more compact, which is beneficial to molding and assembling, and meanwhile, the diagonal length of the effective pixel area of the optical imaging lens on the imaging surface of the optical system can be properly adjusted to obtain the support for the optical systems with different sizes. When the relationship between the two parameters does not satisfy the conditional expression, the overall length of the optical imaging lens is too long, which is not beneficial to realizing the miniaturization of the optical imaging lens.

In some of these embodiments, further comprising: and the diaphragm is arranged between the second lens group and the third lens group.

Based on the above embodiment, the diaphragm is arranged in the middle of the optical imaging lens, so that the optical imaging lens can have a larger field angle, and the picture viewing range is effectively enlarged.

In some embodiments, the first lens group includes a first lens element with negative refractive power and a second lens element with positive refractive power, the first lens element has a convex object-side surface at a paraxial region, the first lens element has a concave image-side surface at a paraxial region, the second lens element has negative refractive power, the second lens element has a convex object-side surface at a paraxial region, the second lens element has a concave image-side surface at a paraxial region, the third lens element has positive refractive power, the third lens element has a convex object-side surface at a paraxial region, the fourth lens element has positive refractive power, the fourth lens element has a concave object-side surface at a paraxial region, the fourth lens element has a convex image-side surface at a paraxial region, the third lens element includes a fifth lens element with positive refractive power and a sixth lens element with positive refractive power, the fifth lens element has a convex object-side surface at a paraxial region, and the sixth lens element has positive refractive power.

Based on the above embodiments, the number, refractive power and surface shapes of the lenses in the optical imaging lens are reasonably configured, so that the optical imaging lens has good optical performance, can well capture the detailed characteristics of a shot object, does not increase the number of lenses in the optical imaging lens, and keeps the miniaturization and light weight of the optical imaging lens.

In some of the embodiments, half of the optical effective diameter of the image side surface of the first lens is SD12, the curvature radius of the image side surface of the first lens at the paraxial region is R12, and SD12 and R12 satisfy the following conditional expressions: SD12/R12 < 0.95.

Based on the above-described embodiment, by designing the relationship between half SD12 of the image-side optical effective diameter of the first lens and the radius of curvature R12 of the image-side surface of the first lens at the paraxial region so as to satisfy the conditional expression: SD12/R12 is less than 0.95, so that the bending degree of the first lens can be effectively controlled by controlling the two parameters, the processing difficulty of the first lens is reduced, and simultaneously, the phenomenon that the imaging of the optical system generates glare due to uneven coating caused by the over-bending of the first lens can be avoided. When the relation between the two parameters does not satisfy the conditional expression, the first lens has large bending degree, high processing difficulty and difficult coating, and the imaging of the optical system is easy to have glare due to the uneven coating, so that the imaging quality is poor.

In some of the embodiments, half of the optical effective diameter of the object side of the first lens is SD11, the rise of the object side of the first lens at the edge of the optical effective diameter is SAG11, and SD11 and SAG11 satisfy the following conditional expressions: 3 < SD11/SAG 11.

Based on the above embodiment, by designing the relationship between the half SD11 of the object side optical effective diameter of the first lens and the rise SAG11 of the object side of the first lens at the edge of the optical effective diameter to satisfy the conditional expression: SD11/SAG11 is more than 3, so that the bending degree of the object side surface shape of the first lens can be effectively controlled by controlling the two parameters, the processing difficulty of the first lens is reduced, and the first lens is convenient to coat. When the relation between the two parameters does not satisfy the conditional expression, the object side surface shape of the first lens has large bending degree, high processing difficulty and difficult film coating, and is not beneficial to the incidence of light rays to the optical system at a large angle, thereby influencing the imaging quality of the optical system.

In a second aspect, an embodiment of the present application provides a camera module, including: the optical imaging lens is used for receiving the light reflected by the shot object and projecting the light to the photosensitive element, and the photosensitive element is used for converting the light into an image signal.

Based on the camera module in the embodiment of the application, due to the adoption of the optical imaging lens, the camera module has good optical performance by reasonably configuring the refractive power of each lens group and the surface shape of each lens group, the detailed characteristics of a shot object can be well captured, and the miniaturization and the light weight of the camera module are kept.

In a third aspect, an embodiment of the present application provides an electronic device, including: such as the camera module.

Based on the electronic equipment in the embodiment of the application, due to the adoption of the camera module, the electronic equipment has good optical performance by reasonably configuring the refractive power and the surface shape of the optical imaging lens in the camera module, the detailed characteristics of a shot object can be well captured, and the miniaturization and the light weight of the electronic equipment are kept.

Based on the optical imaging lens, the camera module and the electronic equipment, the optical imaging lens consisting of the first lens group, the second lens group and the third lens group is designed, and the refractive power and the surface shapes of the lens groups are reasonably configured, so that the optical imaging lens has good optical performance, can well capture the detailed characteristics of a shot object, and keeps the miniaturization and the light weight of the optical imaging lens.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of an optical imaging lens according to an embodiment of the present application;

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

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

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

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

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

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

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

Detailed Description

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

In order to meet the actual use requirement of an automobile driving assistance system, a vehicle-mounted lens needs to have a larger field angle, and the vehicle-mounted lens in the prior art is usually formed by matching and assembling a plurality of lenses, so that the size of the vehicle-mounted lens is larger. In addition, the vehicle-mounted lens in the prior art cannot give consideration to both the field angle and the imaging effect, and when the field angle of the vehicle-mounted lens is large, the imaging quality is poor, and the image is blurred and difficult to see clearly. When the imaging quality of the vehicle-mounted lens is high, the field angle is small, the visible range in the picture is small, and the function of the vehicle-mounted lens cannot be normally played.

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

Referring to fig. 1 to 8, to solve the above technical problem, in a first aspect, an optical imaging lens includes a first lens group 110, a second lens group 120, and a third lens group 130. The first lens group 110, the second lens group 120 and the third lens group 130 are sequentially disposed along the optical axis 100 from the object side surface to the image side surface. The first lens group 110, the second lens group 120 and the third lens group 130 each include at least one lens.

The first lens group 110 has negative refractive power, and the object-side surface of the first lens group 110 is convex at the optical axis 100. The image-side surface of the first lens group 110 is concave at the optical axis 100.

The second lens group 120 has positive refractive power, and the object-side surface of the second lens group 120 is convex at the optical axis 100. The image-side surface of the second lens group 120 is convex at the optical axis 100.

The third lens group 130 with positive refractive power has a convex object-side surface at the optical axis 100. The image-side surface of the third lens group 130 at the optical axis 100 may be correspondingly concave, planar, or convex.

It should be noted that in the present embodiment, the object-side surface of the first lens group 110 refers to the object-side surface of the lens element of the first lens group 110 close to the object side, and the image-side surface of the first lens group 110 refers to the image-side surface of the lens element of the first lens group 110 close to the image side. Similarly, the object-side surface of the second lens group 120 is the object-side surface of the lens element of the second lens group 120 close to the object side, and the image-side surface of the second lens group 120 is the image-side surface of the lens element of the second lens group 120 close to the image side. The object-side surface of the third lens group 130 is the object-side surface of the lens element of the third lens group 130 that is closer to the object side, and the image-side surface of the third lens group 130 is the image-side surface of the lens element of the third lens group 130 that is closer to the image side.

In the embodiment of the present application, the optical imaging lens comprising the first lens group 110, the second lens group 120, and the third lens group 130 is designed, and the refractive powers and the surface shapes of the lens groups are reasonably configured, so that the optical imaging lens has good optical performance, can capture the detailed characteristics of the object, and keeps the miniaturization and light weight of the optical imaging lens.

The maximum field angle of the optical imaging lens is FOV, the effective focal length of the optical imaging lens is f, and the FOV and the f satisfy the following conditional expression: 110deg/mm < FOV/f. Based on the above-described embodiment, by designing the relationship between the maximum field angle FOV of the optical imaging lens and the effective focal length f of the optical imaging lens to satisfy the conditional expression: 110deg/mm < FOV/f, so that the optical system can provide a field angle exceeding 170 degrees, the frame viewing range is effectively improved, the effective focal length of the optical system is not too small, a larger viewing range is accommodated, a shot object at a longer distance can be clearly imaged, the capturing capability of the optical system on low-frequency details is improved, and the shooting requirement of high image quality can be met. When the relationship between the two parameters does not satisfy the conditional expression, the viewing range and the imaging quality of the optical system are difficult to be considered, and the use requirement cannot be well satisfied.

Wherein the combined focal length of the first lens group 110 is f10, the effective focal length of the optical imaging lens is f, and f10 and f satisfy the following conditional expressions: -2 < f10/f < -1. Based on the above-described embodiment, by designing the relationship between the combined focal length f10 of the first lens group 110 and the effective focal length f of the optical imaging lens to satisfy the conditional expression: 2 < f10/f < -1, so that the focal length of the first lens group 110 on the object side of the optical system in the optical imaging lens is designed to be negative, thereby providing negative refractive power for the optical system, and capturing light incident on the optical system at a large angle, so that the optical imaging lens has the characteristics of wide viewing angle, low optical performance sensitivity and miniaturization. When the relationship between the above two parameters does not satisfy the above conditional expression, it is difficult to make the optical imaging lens have a wide angle of view and low optical performance sensitivity while keeping miniaturization.

The distance from the object-side surface of the first lens group 110 to the imaging surface of the optical system on the optical axis 100 is TTL, the effective focal length of the optical imaging lens is f, and TTL and f satisfy the following conditional expressions: TTL/f is less than 14. Based on the above embodiment, the relationship between the distance TTL from the object-side surface of the first lens group 110 to the image plane of the optical system on the optical axis 100 and the effective focal length f of the optical imaging lens is designed to satisfy the following conditional expression: TTL/f is less than 14, so that the optical imaging lens has a larger effective focal length, and the total length of each lens in the optical imaging lens can be effectively reduced, thereby being beneficial to realizing the miniaturization of the optical imaging lens. When the relationship between the two parameters does not satisfy the conditional expression, the total length of each lens in the optical imaging lens is too long, which is not beneficial to realizing the miniaturization of the optical imaging lens.

Wherein the combined focal length of the first lens group 110 and the second lens group 120 is f12, the combined focal length of the third lens group 130 is f30, and f12 and f30 satisfy the following conditional expressions: 1 < f12/f30 < 3. Based on the above embodiment, by designing the relationship between the combined focal length f12 of the first and

second lens groups

110 and 120 and the combined focal length f30 of the third lens group 130 to satisfy the conditional expression: f12/f30 is more than 1 and less than 3, so that the ratio relationship among the first lens group 110, the second lens group 120 and the third lens group 130 is reasonably configured, the optical performance sensitivity of each lens in the optical imaging lens is ensured to be in a balanced state, the total length of the optical imaging lens is reduced, and the aberration during imaging is favorably corrected. When the relationship between the two parameters does not satisfy the above conditional expression, the optical performance sensitivity and the overall length of each lens in the optical imaging lens are difficult to be compatible, which is not favorable for aberration correction.

The distance from the object-side surface of the first lens group 110 to the imaging surface of the optical system on the optical axis 100 is TTL, the sum of the air intervals between the lenses of the optical imaging lens on the optical axis 100 is Σ AT, and TTL and Σ AT satisfy the following conditional expressions: TTL/SIGMA AT < 5. Based on the above embodiment, the relationship between the distance TTL from the object side surface of the first lens group 110 to the image plane of the optical system on the optical axis 100 and the sum Σ AT of the air spaces of the lenses of the optical imaging lens on the optical axis 100 is designed to satisfy the conditional expression: TTL/SIGMA AT < 5, thus, the ratio relation between the total length of the optical imaging lens and the air interval of each lens on the optical axis 100 is reasonably configured, the air interval of each lens on the optical axis 100 can be reduced in a processing range, and the total length of the optical imaging lens is further reduced, thereby reducing the volume of an optical system. When the relationship between the two parameters does not satisfy the above conditional expression, the air space between each lens in the optical imaging lens on the optical axis 100 is too small, which increases the optical performance sensitivity of the lens, is not favorable for assembly, and increases the processing difficulty.

The effective focal length of the optical imaging lens is f, the entrance pupil diameter of the optical imaging lens is EPD, and f and EPD satisfy the following conditional expression: f/EPD < 1.6. Based on the above-described embodiment, by designing the relationship between the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens to satisfy the conditional expression: the f/EPD is less than 1.6, so that the ratio relation between the effective focal length of the optical imaging lens and the entrance pupil diameter of the optical imaging lens is reasonably configured, the characteristic of wide angle is realized under the condition that the optical system has a large aperture and a small overall length, and the shooting effect of high definition and wide angle is further realized. When the relationship between the two parameters does not satisfy the above conditional expression, it is difficult for the optical system to obtain a sufficient amount of light flux in a dark environment, and the brightness during imaging is insufficient, resulting in poor imaging quality.

The distance from the object-side surface of the first lens group 110 to the imaging surface of the optical system on the optical axis 100 is TTL, and the half of the maximum field angle corresponding image height of the optical imaging lens is ImgH, where TTL and ImgH satisfy the following conditional expressions: TTL/(ImgH 2) < 5.5. Based on the above embodiment, the relationship between the distance TTL from the object-side surface of the first lens group 110 to the image plane of the optical system on the optical axis 100 and the half ImgH of the maximum field angle corresponding image height of the optical imaging lens is designed to satisfy the conditional expression: TTL/(ImgH 2) < 5.5, so that the reasonable distribution of the thickness of each lens in the optical imaging lens can be kept under the condition of compressing the total length of the optical imaging lens and making the structure of the optical imaging lens more compact, which is beneficial to molding and assembling, and meanwhile, the diagonal length of the effective pixel area of the optical imaging lens on the imaging surface of the optical system can be properly adjusted to obtain the support for the optical systems with different sizes. When the relationship between the two parameters does not satisfy the conditional expression, the overall length of the optical imaging lens is too long, which is not beneficial to realizing the miniaturization of the optical imaging lens.

The optical imaging lens further includes a diaphragm 140. The stop 140 can reduce stray light in the optical system to improve imaging quality, and the stop 140 may be an aperture stop 140 and/or a field stop 140. Stop 140 may be located between the object plane and the image plane of the optical system, for example, stop 140 may be located: any position between the object plane of the optical system and the object side surface of the first lens group 110, between the image side surface of the first lens group 110 and the object side surface of the second lens group 120, between the image side surface of the second lens group 120 and the object side surface of the third lens group 130, and between the image side surface of the third lens group 130 and the image plane of the optical system. In order to save cost, the stop 140 may be disposed on any one of the object-side surface of the first lens group 110, the object-side surface of the second lens group 120, the object-side surface of the third lens group 130, the image-side surface of the first lens group 110, the image-side surface of the second lens group 120, and the image-side surface of the third lens group 130. In the embodiment of the present application, the stop 140 is disposed between the second lens group 120 and the third lens group 130, and the stop 140 is disposed at the middle position of the optical imaging lens, so that the optical imaging lens can have a larger field angle, and the image viewing range is effectively enlarged.

The first lens group 110 includes a first lens element 111 and a second lens element 112. The first lens element 111 with negative refractive power has a convex object-side surface at the optical axis 100 and a concave image-side surface at the optical axis 100 of the first lens element 111. The second lens element 112 with negative refractive power has a convex object-side surface at the optical axis 100 and a concave image-side surface at the optical axis 100 of the second lens element 112.

The second lens group 120 includes a third lens element 121 and a fourth lens element 122. The third lens element 121 with positive refractive power has a convex object-side surface at the optical axis 100, and the image-side surface of the third lens element 121 at the optical axis 100 may be correspondingly concave, planar or convex. The fourth lens element 122 with positive refractive power has a concave object-side surface at the optical axis 100 and a convex image-side surface at the optical axis 100 of the fourth lens element 122.

The third lens group 130 includes a fifth lens element 131 and a sixth lens element 132. The fifth lens element 131 with positive refractive power has a convex object-side surface at the optical axis 100 of the fifth lens element 131, and an image-side surface of the fifth lens element 131 at the optical axis 100 may be correspondingly concave, planar or convex. The sixth lens element 132 with positive refractive power has a surface shape of the object-side surface and the image-side surface of the sixth lens element 132 that are correspondingly disposed so as to satisfy the refractive power requirement of the sixth lens element 132. For example, the object-side surface of the sixth lens element 132 is convex at the optical axis 100, and the image-side surface of the sixth lens element 132 is also convex at the optical axis 100.

Wherein, half of the optical effective diameter of the image side surface of the first lens 111 is SD12, the curvature radius of the image side surface of the first lens 111 at the optical axis 100 is R12, and SD12 and R12 satisfy the following conditional expressions: SD12/R12 < 0.95. Based on the above embodiment, by designing the relationship between half SD12 of the image-side surface optical effective diameter of the first lens 111 and the curvature radius R12 of the image-side surface of the first lens 111 at the optical axis 100 to satisfy the conditional expression: SD12/R12 is less than 0.95, so that the bending degree of the first lens 111 can be effectively controlled by controlling the two parameters, the processing difficulty of the first lens 111 is reduced, and simultaneously, the phenomenon that the imaging of an optical system generates glare due to uneven coating caused by the fact that the first lens 111 is excessively bent can be avoided. When the relationship between the two parameters does not satisfy the conditional expression, the first lens 111 has a large bending degree, high processing difficulty and difficult coating, and the imaging of the optical system is easy to be glare due to uneven coating, and the imaging quality is poor.

Wherein, half of the optical effective diameter of the object side surface of the first lens 111 is SD11, the rise of the object side surface of the first lens 111 at the edge of the optical effective diameter is SAG11, and SD11 and SAG11 satisfy the following conditional expressions: 3 < SD11/SAG 11. Based on the above embodiment, by designing the relationship between the half SD11 of the object side optical effective diameter of the first lens 111 and the rise SAG11 of the object side of the first lens 111 at the edge of the optical effective diameter to satisfy the conditional expression: SD11/SAG11 is more than 3, so that the bending degree of the object side surface shape of the first lens 111 can be effectively controlled by controlling the two parameters, the processing difficulty of the first lens 111 is reduced, and the first lens 111 is convenient to coat. When the relationship between the two parameters does not satisfy the above conditional expression, the object side surface shape of the first lens 111 has a large degree of curvature, high processing difficulty and difficult film coating, and is not favorable for light to enter the optical system at a large angle, which affects the imaging quality of the optical system.

The object-side surface of each lens refers to a surface of the lens facing the object surface, and the image-side surface of the lens refers to a surface of the lens facing the image plane. For example, the object side surface of the first lens 111 refers to a surface of the first lens 111 facing (close to) the object side, and the image side surface of the first lens 111 refers to a surface of the first lens 111 facing (close to) the imaging plane side.

Each lens element can be made of a transparent optical material, and in order to save the cost of the optical imaging lens, each lens element in the first lens group 110, the second lens group 120, and the third lens group 130 can be made of a plastic material. The imaging quality of the optical system is closely related to the material of each lens, and therefore, in order to improve the imaging quality of the optical system, the first lens group 110, the second lens group 120, and the third lens group 130 may be made of glass material partially or entirely.

Light rays emitted or reflected by the photographed object sequentially pass through the first lens group 110, the second lens group 120 and the third lens group 130 of the optical imaging lens from the object side to the image side, and form an image on the image side. In order to ensure the imaging clarity of the object to be photographed at the image side, the optical imaging lens further includes an infrared filter 200, and the infrared filter 200 may be disposed between the image side surface of the third lens group 130 and the image side surface of the optical system. By arranging the infrared filter 200 in the optical imaging lens, the light rays need to pass through the infrared filter 200 after passing through the third lens group 130, so that the infrared rays in the light rays can be effectively filtered, and the imaging definition of the shot object is further ensured.

By designing the optical imaging lens consisting of the first lens group 110, the second lens group 120 and the third lens group 130 and reasonably configuring the refractive power and the surface shape of each lens group, the optical imaging lens has good optical performance, can capture the detailed characteristics of a shot object well, and keeps the miniaturization and light weight of the optical imaging lens.

Example one

Referring to fig. 1, the optical imaging lens in this embodiment includes a first lens group 110, a second lens group 120, a third lens group 130 and an infrared filter 200 sequentially disposed along an optical axis 100 from an object side surface to an image side surface, and a diaphragm 140 disposed between the second lens group 120 and the third lens group 130. The first lens group 110 includes a first lens element 111 and a second lens element 112, the second lens group 120 includes a third lens element 121 and a fourth lens element 122, and the third lens group 130 includes a fifth lens element 131 and a sixth lens element 132. The specific position of the stop 140 is arranged between the image side of the fourth lens 122 and the object side of the fifth lens 131.

The first lens group 110 with negative refractive power has a convex object-side surface at the optical axis 100 and a concave image-side surface at the optical axis 100 of the first lens group 110. Specifically, the first lens element 111 with negative refractive power has a convex object-side surface of the first lens element 111 at the optical axis 100 and a concave image-side surface of the first lens element 111 at the optical axis 100. The second lens element 112 with negative refractive power has a convex object-side surface at the optical axis 100 and a concave image-side surface at the optical axis 100 of the second lens element 112.

The second lens group 120 with positive refractive power has a convex object-side surface at the optical axis 100 and a convex image-side surface at the optical axis 100 of the second lens group 120. Specifically, the third lens element 121 with positive refractive power has a convex object-side surface at the optical axis 100 and a convex image-side surface at the optical axis 100 of the third lens element 121. The fourth lens element 122 with positive refractive power has a concave object-side surface at the optical axis 100 and a convex image-side surface at the optical axis 100 of the fourth lens element 122.

The third lens group 130 with positive refractive power has a convex object-side surface at the optical axis 100 and a concave image-side surface at the optical axis 100 of the third lens group 130. Specifically, the fifth lens element 131 with positive refractive power has a convex object-side surface of the fifth lens element 131 at the optical axis 100 and a concave image-side surface of the fifth lens element 131 at the optical axis 100. The sixth lens element 132 with positive refractive power has a convex object-side surface at the optical axis 100 of the sixth lens element 132, and a concave image-side surface at the optical axis 100 of the sixth lens element 132.

In this embodiment, the refractive index, abbe number and focal length are referenced to a light ray with a wavelength of 587.56nm, and the relevant parameters of the optical imaging lens are shown in table 1. Where f denotes an effective focal length of the optical imaging lens, FNO denotes an aperture value, Semi-FOV denotes a half of a maximum field angle of the optical imaging lens, and TTL denotes a distance from an object-side surface of the first lens group 110 to an image plane of the optical system on the optical axis 100. It should be noted that the focal length, radius of curvature, and thickness are all in millimeters.

TABLE 1

As can be seen from table 1 above, in this embodiment, the calculation results of the numerical relationship between the relevant parameters of the optical imaging lens are all within a reasonable range, as shown in table 2.

TABLE 2

Parameter(s)	Calculation results	Parameter(s)	Calculation results
				f[mm]	1.53	f12/f30	2.17
FNO	1.50	TTL/∑AT	4.76
				Semi-FOV[deg]	90.77	f/EPD	1.50
TTL[mm]	15.98	TTL/(ImgH*2)	4.08
				FOV/f[deg/mm]	118.65	SD12/R12	0.87
f10/f	-1.69	SD11/SAG11	4.02
				TTL/f	10.44

The left graph of FIG. 2 is the light spherical aberration curves at 656.2725mm, 587.5618mm and 486.1327mm wavelengths in this example. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the normalized field of view.

It can be seen from the left diagram of fig. 2 that the spherical aberration corresponding to the wavelengths of 656.2725mm, 587.5618mm and 486.1327mm are all within 1.00mm, which indicates that the imaging quality of the optical imaging lens in this embodiment is better.

Fig. 2 is a graph of astigmatism at a wavelength of 587.5618mm in the present embodiment. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height.

It can be seen from the graph in fig. 2 that the astigmatism corresponding to a wavelength of 587.5618mm is within 1.96mm, and a good compensation is obtained.

FIG. 2 is a graph showing distortion at a wavelength of 587.5618mm in the present embodiment. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height.

It can be seen from the right image of fig. 2 that the distortion at the 587.5618mm wavelength is well corrected.

Example two

Referring to fig. 3, the optical imaging lens in this embodiment includes a first lens group 110, a second lens group 120, a third lens group 130 and an infrared filter 200 sequentially disposed along an optical axis 100 from an object side surface to an image side surface, and a diaphragm 140 disposed between the second lens group 120 and the third lens group 130. The first lens group 110 includes a first lens element 111 and a second lens element 112, the second lens group 120 includes a third lens element 121 and a fourth lens element 122, and the third lens group 130 includes a fifth lens element 131 and a sixth lens element 132. The specific position of the stop 140 is arranged between the image side of the fourth lens 122 and the object side of the fifth lens 131.

The third lens group 130 with positive refractive power has a convex object-side surface at the optical axis 100 and a convex image-side surface at the optical axis 100 of the third lens group 130. Specifically, the fifth lens element 131 with positive refractive power has a convex object-side surface of the fifth lens element 131 at the optical axis 100 and a concave image-side surface of the fifth lens element 131 at the optical axis 100. The sixth lens element 132 with positive refractive power has a convex object-side surface of the sixth lens element 132 along the optical axis 100, and a convex image-side surface of the sixth lens element 132 along the optical axis 100.

In this embodiment, the refractive index, abbe number and focal length are referenced to a light ray with a wavelength of 587.56nm, and the relevant parameters of the optical imaging lens are shown in table 3. Where f denotes an effective focal length of the optical imaging lens, FNO denotes an aperture value, Semi-FOV denotes a half of a maximum field angle of the optical imaging lens, and TTL denotes a distance from an object-side surface of the first lens group 110 to an image plane of the optical system on the optical axis 100. It should be noted that the focal length, radius of curvature, and thickness are all in millimeters.

TABLE 3

As can be seen from table 3 above, in this embodiment, the calculation results of the numerical relationship between the relevant parameters of the optical imaging lens are all within a reasonable range, as shown in table 4.

TABLE 4

Parameter(s)	Calculation results	Parameter(s)	Calculation results
				f[mm]	1.51	f12/f30	1.95
FNO	1.50	TTL/∑AT	4.25
				Semi-FOV[deg]	92.71	f/EPD	1.50
TTL[mm]	16.37	TTL/(ImgH*2)	4.20
				FOV/f[deg/mm]	122.79	SD12/R12	0.89
f10/f	-1.73	SD11/SAG11	4.05
				TTL/f	10.84

The left graph in FIG. 4 is the light spherical aberration curves at 656.2725mm, 587.5618mm and 486.1327mm in this embodiment. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the normalized field of view.

It can be seen from the left diagram of fig. 4 that the spherical aberration corresponding to the wavelengths of 656.2725mm, 587.5618mm, and 486.1327mm are all within 1.00mm, which indicates that the imaging quality of the optical imaging lens in this embodiment is better.

Fig. 4 is a graph showing astigmatism at a wavelength of 587.5618mm in the present embodiment. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height.

It can be seen from the graph in fig. 4 that the corresponding astigmatism at the wavelength of 587.5618mm is within 1.95mm, and better compensation is obtained.

FIG. 4 is a graph showing distortion at a wavelength of 587.5618mm in the present embodiment. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height.

It can be seen from the right image of fig. 4 that the distortion at the 587.5618mm wavelength is well corrected.

EXAMPLE III

Referring to fig. 5, the optical imaging lens in this embodiment includes a first lens group 110, a second lens group 120, a third lens group 130 and an infrared filter 200 sequentially disposed along an optical axis 100 from an object side surface to an image side surface, and a diaphragm 140 disposed between the second lens group 120 and the third lens group 130. The first lens group 110 includes a first lens element 111 and a second lens element 112, the second lens group 120 includes a third lens element 121 and a fourth lens element 122, and the third lens group 130 includes a fifth lens element 131 and a sixth lens element 132. The specific position of the stop 140 is arranged between the image side of the fourth lens 122 and the object side of the fifth lens 131.

The second lens group 120 with positive refractive power has a convex object-side surface at the optical axis 100 and a convex image-side surface at the optical axis 100 of the second lens group 120. Specifically, the third lens element 121 with positive refractive power has a convex object-side surface at the optical axis 100 and a concave image-side surface at the optical axis 100 of the third lens element 121. The fourth lens element 122 with positive refractive power has a concave object-side surface at the optical axis 100 and a convex image-side surface at the optical axis 100 of the fourth lens element 122.

The third lens group 130 with positive refractive power has a convex object-side surface at the optical axis 100 and a convex image-side surface at the optical axis 100 of the third lens group 130. Specifically, the fifth lens element 131 with positive refractive power has a convex object-side surface of the fifth lens element 131 at the optical axis 100 and a convex image-side surface of the fifth lens element 131 at the optical axis 100. The sixth lens element 132 with positive refractive power has a concave object-side surface of the sixth lens element 132 at the optical axis 100 and a convex image-side surface of the sixth lens element 132 at the optical axis 100.

In this embodiment, the refractive index, abbe number and focal length are referenced to a light ray with a wavelength of 587.56nm, and the relevant parameters of the optical imaging lens are shown in table 5. Where f denotes an effective focal length of the optical imaging lens, FNO denotes an aperture value, Semi-FOV denotes a half of a maximum field angle of the optical imaging lens, and TTL denotes a distance from an object-side surface of the first lens group 110 to an image plane of the optical system on the optical axis 100. It should be noted that the focal length, radius of curvature, and thickness are all in millimeters.

TABLE 5

As can be seen from table 5 above, in this embodiment, the calculation results of the numerical relationship between the relevant parameters of the optical imaging lens are all within a reasonable range, as shown in table 6.

TABLE 6

The left graph of FIG. 6 is the light spherical aberration curves at 656.2725mm, 587.5618mm and 486.1327mm wavelengths in this example. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the normalized field of view.

It can be seen from the left diagram of fig. 6 that the spherical aberration corresponding to the wavelengths of 656.2725mm, 587.5618mm and 486.1327mm are all within 1.00mm, which indicates that the imaging quality of the optical imaging lens in this embodiment is better.

FIG. 6 is a graph showing astigmatism at a wavelength of 587.5618mm in the present embodiment. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height.

It can be seen from the graph in fig. 6 that the astigmatism corresponding to the wavelength of 587.5618mm is within 1.94mm, and the better compensation is obtained.

FIG. 6 is a graph showing distortion at a wavelength of 587.5618mm in the present embodiment. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height.

It can be seen from the right image of fig. 6 that the distortion at the 587.5618mm wavelength is well corrected.

Example four

Referring to fig. 7, the optical imaging lens in this embodiment includes a first lens group 110, a second lens group 120, a third lens group 130 and an infrared filter 200 sequentially disposed along an optical axis 100 from an object side surface to an image side surface, and a diaphragm 140 disposed between the second lens group 120 and the third lens group 130. The first lens group 110 includes a first lens element 111 and a second lens element 112, the second lens group 120 includes a third lens element 121 and a fourth lens element 122, and the third lens group 130 includes a fifth lens element 131 and a sixth lens element 132. The specific position of the stop 140 is arranged between the image side of the fourth lens 122 and the object side of the fifth lens 131.

In this embodiment, the refractive index, abbe number and focal length are referenced to a light ray with a wavelength of 587.56nm, and the relevant parameters of the optical imaging lens are shown in table 7. Where f denotes an effective focal length of the optical imaging lens, FNO denotes an aperture value, Semi-FOV denotes a half of a maximum field angle of the optical imaging lens, and TTL denotes a distance from an object-side surface of the first lens group 110 to an image plane of the optical system on the optical axis 100. It should be noted that the focal length, radius of curvature, and thickness are all in millimeters.

TABLE 7

As can be seen from table 7 above, in this embodiment, the calculation results of the numerical relationship between the relevant parameters of the optical imaging lens are all within a reasonable range, as shown in table 8.

TABLE 8

Parameter(s)	Calculation results	Parameter(s)	Calculation results
				f[mm]	1.49	f12/f30	1.56
FNO	1.55	TTL/∑AT	4.01
				Semi-FOV[deg]	94.75	f/EPD	1.55
TTL[mm]	16.87	TTL/(ImgH*2)	4.37
				FOV/f[deg/mm]	127.18	SD12/R12	0.92
f10/f	-1.57	SD11/SAG11	5.33
				TTL/f	11.32

The left graph of FIG. 8 is the light spherical aberration curves at 656.2725mm, 587.5618mm and 486.1327mm wavelengths in this example. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the normalized field of view.

It can be seen from the left image of fig. 8 that the spherical aberration corresponding to the wavelengths of 656.2725mm, 587.5618mm and 486.1327mm are all within 1.00mm, which indicates that the imaging quality of the optical imaging lens in this embodiment is better.

FIG. 8 is a graph showing astigmatism at a wavelength of 587.5618mm in the present embodiment. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height.

It can be seen from the graph in fig. 8 that the astigmatism corresponding to the wavelength of 587.5618mm is within 1.93mm, and the better compensation is obtained.

FIG. 8 is a graph showing distortion at a wavelength of 587.5618mm in the present embodiment. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height.

It can be seen from the right image of fig. 8 that the distortion at the 587.5618mm wavelength is well corrected.

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

The camera module adopts the optical imaging lens, and the camera module has good optical performance by reasonably configuring the refractive power and the surface shape of each lens group in the camera module, can well capture the detailed characteristics of a shot object, and keeps the miniaturization and the light weight of the camera module.

In a third aspect, an embodiment of the present application provides an electronic device, which includes the camera module described above. The electronic equipment adopts the camera module, and the refractive power and the surface shapes of the lens groups in the electronic equipment are reasonably configured, so that the electronic equipment has good optical performance, can well capture the detailed characteristics of a shot object, and keeps the miniaturization and the light weight of the electronic equipment.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it is to be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An optical imaging lens, comprising:

a first lens group having negative refractive power, an object side surface of the first lens group being convex at a paraxial region thereof, and an image side surface of the first lens group being concave at the paraxial region thereof;

a second lens group having positive refractive power, an object side surface of the second lens group being convex at a paraxial region, and an image side surface of the second lens group being convex at a paraxial region;

the third lens group comprises at least one lens, the third lens group has positive refractive power, and the object side surface of the third lens group is a convex surface at a position close to the optical axis.

2. The optical imaging lens of claim 1,

the maximum field angle of the optical imaging lens is FOV, the effective focal length of the optical imaging lens is f, and the FOV and the f meet the following conditional expression:

110deg/mm＜FOV/f。

3. the optical imaging lens of claim 1,

the combined focal length of the first lens group is f10, the effective focal length of the optical imaging lens is f, and f10 and f satisfy the following conditional expression:

-2＜f10/f＜-1。

4. the optical imaging lens of claim 1,

the distance between the object side surface of the first lens group and the imaging surface of the optical system on the optical axis is TTL, the effective focal length of the optical imaging lens is f, and the TTL and the f satisfy the following conditional expressions:

TTL/f＜14。

5. the optical imaging lens of claim 1,

the combined focal length of the first lens group and the second lens group is f12, the combined focal length of the third lens group is f30, and f12 and f30 satisfy the following conditional expressions:

1＜f12/f30＜3。

6. the optical imaging lens of claim 1,

the distance between the object side surface of the first lens group and the imaging surface of the optical system on the optical axis is TTL, the sum of the air intervals of the lenses of the optical imaging lens on the optical axis is Sigma AT, and the TTL and the Sigma AT satisfy the following conditional expression:

TTL/∑AT＜5。

7. the optical imaging lens of claim 1,

the effective focal length of the optical imaging lens is f, the entrance pupil diameter of the optical imaging lens is EPD, and f and EPD satisfy the following conditional expression:

f/EPD＜1.6。

8. the optical imaging lens of claim 1,

the distance between the object side surface of the first lens group and the imaging surface of the optical system on the optical axis is TTL, the half of the maximum field angle corresponding image height of the optical imaging lens is ImgH, and the TTL and the ImgH satisfy the following conditional expressions:

TTL/(ImgH*2)＜5.5。

9. the optical imaging lens of claim 1, further comprising:

and the diaphragm is arranged between the second lens group and the third lens group.

10. The optical imaging lens of claim 1,

the first lens group comprises a first lens element with negative refractive power and a second lens element with negative refractive power, wherein an object-side surface of the first lens element is convex at a paraxial region, an image-side surface of the first lens element is concave at the paraxial region, the second lens element with negative refractive power is convex at the object-side surface of the second lens element, and the image-side surface of the second lens element is concave at the paraxial region;

the second lens group comprises a third lens element with positive refractive power and a fourth lens element with positive refractive power, wherein an object-side surface of the third lens element is convex at a paraxial region, and the fourth lens element with positive refractive power is concave at a paraxial region;

the third lens group includes a fifth lens element with positive refractive power and a sixth lens element with positive refractive power, wherein an object-side surface of the fifth lens element is convex at a paraxial region thereof.

11. The optical imaging lens of claim 10,

half of the optical effective diameter of the image side surface of the first lens is SD12, the curvature radius of the image side surface of the first lens at a paraxial region is R12, and SD12 and R12 satisfy the following conditional expressions:

SD12/R12＜0.95。

12. the optical imaging lens of claim 10,

half of the optical effective diameter of the object side of the first lens is SD11, the rise of the object side of the first lens at the edge of the optical effective diameter is SAG11, and SD11 and SAG11 satisfy the following conditional expressions:

3＜SD11/SAG11。

13. the utility model provides a camera module which characterized in that includes:

an optical imaging lens according to any one of claims 1 to 12;

the photosensitive element is arranged on the image side of the optical system;

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

14. An electronic device, comprising:

the camera module of claim 13.