WO2023025183A1

WO2023025183A1 - Optical imaging lens, camera module and electronic device

Info

Publication number: WO2023025183A1
Application number: PCT/CN2022/114453
Authority: WO
Inventors: 高雪
Original assignee: 维沃移动通信（杭州）有限公司
Priority date: 2021-08-27
Filing date: 2022-08-24
Publication date: 2023-03-02
Also published as: CN113721347A; CN113721347B

Abstract

An optical imaging lens, a camera module and electronic device, the optical imaging lens comprising: a first lens (L1) having negative optical power, an object side surface (S1) thereof being convex and an image side surface (S2) thereof being concave; a second lens (L2) having optical power; a third lens (L3) having positive optical power, an object side surface (S5) thereof being convex and an image side surface (S6) thereof being convex; a fourth lens (L4) having negative optical power, an object side surface (S7) thereof being convex and an image side surface (S8) thereof being concave; a fifth lens (L5) having negative optical power; a sixth lens (L6) having positive optical power, an object side surface (S11) being convex and an image side surface (S12) being convex; and a seventh lens (L7) having positive optical power, an object side surface (S13) thereof being convex and an image side surface (S14) thereof being convex. The maximum half field of view of the optical imaging lens is greater than or equal to 64.5°; and the Abbe number of the second lens (L2) is V2, the radius of curvature of an image side surface (S4) of the second lens (L2) is R4, and 2.5<V2/R4<3.5.

Description

Optical imaging lens, camera module and electronic equipment

Cross References to Related Applications

This application claims the priority of the Chinese patent application 202110997239.0 entitled "Optical Imaging Lens, Camera Module and Electronic Equipment" filed on August 27, 2021, the entire content of which is incorporated herein by reference.

technical field

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

Background technique

As users demand for shooting with a large field of view, more and more electronic devices are equipped with optical imaging lenses with ultra-wide angles. However, due to the large distortion of the ultra-wide-angle optical imaging lens, and the greater the angle, the greater the distortion, resulting in a more obvious distortion of the captured image, which makes the proportion of the image uncoordinated. At present, software is generally used to correct distortion of captured images. On the one hand, the ability of software to correct distortion is limited. On the other hand, software correction needs to consume additional power consumption, resulting in serious heating of electronic equipment during shooting.

Contents of the invention

The purpose of the present application is to provide an optical imaging lens, a camera module, and an electronic device, at least to solve the problem of large distortion of an ultra-wide-angle optical imaging lens in the prior art.

In order to solve the above-mentioned technical problems, the application is implemented as follows:

In the first aspect, the embodiment of the present application proposes an optical imaging lens, which sequentially includes from the object side to the image side along the optical axis:

The first lens has negative refractive power, its object side is convex, and its image side is concave;

a second lens having optical power;

The third lens has positive refractive power, its object side is convex, and its image side is convex;

The fourth lens has negative refractive power, its object side is convex, and its image side is concave;

a fifth lens having negative optical power;

a sixth lens element having positive optical power, convex on the object side and convex on the image side; and

The seventh lens has positive refractive power, its object side is convex, and its image side is convex;

The maximum half field angle of the optical imaging lens is greater than or equal to 64.5°; and

The Abbe number of the second lens is V2, and the radius of curvature of the image side of the second lens is R4, 2.5<V2/R4<3.5.

In the second aspect, the embodiment of the present application provides a camera module, including the optical imaging lens in the first aspect.

In a third aspect, the embodiment of the present application provides an electronic device, including the camera module in the second aspect.

In the embodiment of the present application, by arranging seven lenses, and by reasonably setting the focal power type and surface shape, curvature radius, Abbe number and other characteristics of each lens, the optical imaging lens can be made to have ultra-wide angle and low distortion characteristics.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 shows a schematic structural view of an optical imaging lens provided according to an embodiment of the first aspect of the present application;

Fig. 2 shows the axial chromatic aberration curve of the optical imaging lens provided according to the embodiment of the first aspect of the present application;

Fig. 3 shows the astigmatism curve of the optical imaging lens provided according to the embodiment of the first aspect of the application;

Fig. 4 shows the distortion curve of the optical imaging lens provided according to the embodiment of the first aspect of the present application;

Fig. 5 shows the magnification chromatic aberration curve of the optical imaging lens provided according to the embodiment of the first aspect of the present application;

Fig. 6 shows the axial chromatic aberration curve of the optical imaging lens provided according to the embodiment of the first aspect of the present application;

Fig. 7 shows the astigmatism curve of the optical imaging lens provided according to the embodiment of the first aspect of the present application;

Fig. 8 shows the distortion curve of the optical imaging lens provided according to the embodiment of the first aspect of the present application;

Fig. 9 shows the chromatic aberration curve of magnification of the optical imaging lens provided according to the embodiment of the first aspect of the present application.

Reference signs:

L1, first lens; L2, second lens; L3, third lens; L4, fourth lens; L5, fifth lens; L6, sixth lens; L7, seventh lens; L8, filter.

Detailed ways

The characteristics and exemplary embodiments of various aspects of the application will be described in detail below. In order to make the purpose, technical solution and advantages of the application clearer, the application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only intended to explain the present application rather than limit the present application. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the statement "comprising..." does not exclude the presence of additional same elements in the process, method, article or device comprising said element.

In the drawings, the thickness, size and shape of lenses have been slightly exaggerated for convenience of illustration. In particular, the shapes of spherical or aspheric surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspheric surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The drawings are examples only and are not strictly drawn to scale.

In this paper, if the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the area near the optical axis (referred to as the paraxial area); if the lens surface is concave and the concave position is not defined , which means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

The camera module according to the embodiment of the present application will be described below with reference to FIG. 1 .

The optical imaging lens according to the embodiment of the present application may include seven lenses with refractive power, that is, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens lens L6 and seventh lens L7. The seven lenses are arranged sequentially from the object side to the image side along the optical axis, and there may be an air space between each adjacent lens.

The maximum half field of view (Semi-FOV) of the optical imaging lens of the embodiment of the present application is greater than or equal to 64.5°. The first lens L1 can be configured to provide a larger viewing angle, the first lens L1 and the second lens L2 can be configured to eliminate spherical aberration and coma aberration, and the third lens L3 to the seventh lens L7 can be configured for distortion removal.

In the embodiment of the present application, by reasonably setting the focal power type and surface shape of each lens, as well as the radius of curvature, Abbe number and other characteristics, not only can the imaging quality of the optical system be satisfied, but also the optical imaging lens can have ultra-wide angle and low Distortion properties. The characteristics of each lens will be described below.

The first lens L1 has negative refractive power, its object side S1 is convex, and its image side S2 is concave. The second lens L2 has a focal power, the Abbe number of the second lens L2 is V2, the curvature radius of the image side S4 of the second lens L2 is R4, and 2.5<V2/R4<3.5. The third lens L3 has positive refractive power, its object side S5 is convex, and its image side S6 is convex. The fourth lens L4 has negative refractive power, its object side S7 is convex, and its image side S8 is concave. Fifth lens L5 has negative power. The sixth lens L6 has positive refractive power, its object side S11 is convex, and its image side S12 is convex. The seventh lens L7 has positive refractive power, its object side S13 is convex, and its image side S14 is convex.

By reasonably setting the focal power of each lens and the surface shape of each lens, it is beneficial to reduce the spherical aberration, coma and distortion of the optical imaging lens while the optical imaging lens has a large field of view, so that the optical The imaging lens has the characteristics of ultra-wide angle and low distortion.

In some embodiments, the value of the radius of curvature of the object side S1 of the first lens L1 is R1, the value of the radius of curvature of the image side S2 of the first lens L1 is R2, 0.5<(R1-R2)/(R1+R2)< 2.5. Here, by controlling the ratio of the difference between the radius of curvature on both sides of the object image of the first lens L1 to the sum of the radii of curvature on both sides of the object image of the first lens L1 within the above range, it is possible to reasonably control the light of the optical imaging lens passing through the first lens L1 The deflection angle can effectively reduce the sensitivity of the optical imaging lens.

In some embodiments, the radius of curvature of the object side S3 of the second lens L2 is R3, the radius of curvature of the image side S4 of the second lens L2 is R4, and −1.5<R4/R3<1.5. Here, by controlling the ratio of the radius of curvature on both sides of the object image of the second lens L2 within the above range, it is beneficial to reduce the sensitivity of the optical imaging lens, and at the same time, it can also balance the coma aberration of the external field of view of the optical imaging lens, and optimize the optical imaging lens. Ray aberration curve.

In some embodiments, the radius of curvature of the object side S5 of the third lens L3 is R5, the radius of curvature of the image side S6 of the third lens L3 is R6, and −2<R5/R6<−1.5. Here, by controlling the ratio of the radius of curvature on both sides of the object image of the third lens L3 within the above-mentioned range, the size of the optical imaging lens can be reduced, so that the focal power of the optical imaging lens can be reasonably allocated, and the distance from the diaphragm can be corrected. resulting distortion.

In some embodiments, the effective focal length of the first lens L1 is f1, the effective focal length of the second lens L2 is f2, and −5<f2/f1<−4. Here, by controlling the ratio of the effective focal length of the first lens L1 to the effective focal length of the second lens L2 within the above-mentioned range, the size of the optical imaging lens can be reduced, so that the focal power of the optical imaging lens can be reasonably allocated, and the The spherical aberration contribution of the first lens L1 and the second lens L2 is controlled within a reasonable range, so as to obtain better imaging quality of the on-axis field of view.

In some embodiments, the effective focal length of the third lens L3 is f3, the effective focal length of the fourth lens L4 is f4, and −4<f4/f3<−3. Here, by controlling the ratio of the effective focal length of the third lens L3 to the effective focal length of the fourth lens L4 within the above range, the aberration of the optical imaging lens can be better balanced and the resolution of the optical imaging lens can be improved.

In some embodiments, the distance on the optical axis from the object side S1 of the first lens L1 to the imaging surface S17 of the optical imaging lens is TTL, and the effective focal length of the sixth lens L6 is f6, 1<TTL/f6<2.5 .

TTL can also be called the total optical length of the optical imaging lens. Here, by controlling the ratio of the total optical length of the optical imaging lens to the effective focal length of the sixth lens L6 within the above range, it is beneficial to reduce the thickness of the optical imaging lens and to better adjust the chromatic aberration of the optical imaging lens.

In some embodiments, the central thickness value of the first lens L1 on the optical axis is CT1, and the air gap distance between the first lens L1 and the second lens L2 on the optical axis is T12, 1.5<T12/CT1< 3. Here, by controlling the air separation distance between the first lens L1 and the second lens L2 on the optical axis within the above range, it is beneficial to realize the miniaturization of the optical imaging lens.

In some embodiments, the central thickness value of the third lens L3 on the optical axis is CT3, the air distance between the third lens L3 and the fourth lens L4 on the optical axis is T34, and 20<CT3/T34< twenty one. Here, by controlling the air gap distance value on the optical axis between the third lens L3 and the fourth lens L4 to be in the above range, it is beneficial to ensure the stability of the third lens L3 during assembly, thereby helping to improve the reliability of the optical imaging lens. Processability, while ensuring that the optical imaging lens has better imaging quality.

In some embodiments, the central thickness value of the fourth lens L4 on the optical axis is CT4, and the air gap distance between the fourth lens L4 and the fifth lens L5 on the optical axis is T45, 0.5<CT4/T45< 1. Here, by controlling the air gap distance value on the optical axis between the fourth lens L4 and the fifth lens L5 in the above range, it is beneficial to ensure the stability of the fourth lens L4 when assembled, thereby helping to improve the reliability of the optical imaging lens. Processability, while ensuring that the optical imaging lens has better imaging quality.

In addition, the optical imaging lens may further include a diaphragm, and the diaphragm may be disposed at an appropriate position as required, for example, the diaphragm may be disposed between the second lens L2 and the third lens L3. The optical imaging lens may further include a filter L8 for correcting color aberration, and the filter L8 has an object side S15 and an image side S16. The optical imaging lens may further include a photosensitive element for providing an imaging surface S17, and a protective glass for protecting the photosensitive element on the imaging surface S17.

The optical imaging lens is described in detail below in conjunction with specific embodiments.

Example 1

The optical imaging lens includes in sequence from the object side to the image side along the optical axis: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7 and filter L8. The first lens L1 has negative refractive power, its object side S1 is convex, and its image side S2 is concave. The second lens L2 has positive refractive power, its object side S3 is convex, and its image side S4 is concave. The third lens L3 has positive refractive power, its object side S5 is convex, and its image side S6 is convex. The fourth lens L4 has negative refractive power, its object side S7 is convex, and its image side S8 is concave. The fifth lens L5 has negative refractive power, its object side S9 is concave, and its image side S10 is convex. The sixth lens L6 has positive refractive power, its object side S11 is convex, and its image side S12 is convex. The seventh lens L7 has positive refractive power, its object side S13 is convex, and its image side S14 is convex. The light from the object can pass through S1 to S16 in sequence and finally be imaged on the imaging plane S17.

Table 1 shows the surface type, radius of curvature, thickness, material and conic coefficient of each lens of the optical imaging lens of Example 1, wherein the units of radius of curvature and thickness are millimeters (mm).

In Table 1, OBJ represents the surface where the subject is located, and STO represents the stop surface.

It can be seen from Table 1 that the object side and the image side of any one of the first lens L1 to the seventh lens L7 are aspheric surfaces, and the surface type x of each aspheric lens can be defined by but not limited to the following aspheric surface formula:

Among them, x is the distance vector height of the aspheric surface from the apex of the aspheric surface at the position of height h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is shown in Table 1 The reciprocal of the radius of curvature R in the middle); k is the cone coefficient (given in Table 1); Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of each aspheric surface.

Table 1

FIG. 2 shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 1, which indicates that the focal point of light rays of different wavelengths passing through the lens deviates. FIG. 3 shows the astigmatism curves of the optical imaging lens of Embodiment 1, which represent meridional image plane curvature and sagittal image plane curvature. FIG. 4 shows the distortion curves of the optical imaging lens of Embodiment 1, which represent the distortion values corresponding to different viewing angles. FIG. 5 shows the magnification chromatic aberration curve of the optical imaging lens of Embodiment 1, which represents the deviation of different image heights on the imaging plane S17 after light passes through the lens. According to FIG. 2 to FIG. 5 , it can be seen that the optical imaging lens provided in Embodiment 1 can achieve good imaging quality.

Table 2

Example 2

The optical imaging lens includes in sequence from the object side to the image side along the optical axis: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7 and filter L8. The first lens L1 has negative refractive power, its object side S1 is convex, and its image side S2 is concave. The second lens L2 has negative refractive power, its object side S3 is concave, and its image side S4 is concave. The third lens L3 has positive refractive power, its object side S5 is convex, and its image side S6 is convex. The fourth lens L4 has negative refractive power, its object side S7 is convex, and its image side S8 is concave. The fifth lens L5 has negative refractive power, its object side S9 is concave, and its image side S10 is concave. The sixth lens L6 has positive refractive power, its object side S11 is convex, and its image side S12 is convex. The seventh lens L7 has positive refractive power, its object side S13 is convex, and its image side S14 is convex. The light from the object can pass through S1 to S16 in sequence and finally be imaged on the imaging plane S17.

Table 3 shows the surface type, radius of curvature, thickness, material and conic coefficient of each lens of the optical imaging lens of Example 2, wherein the units of radius of curvature and thickness are millimeters (mm).

In Table 3, OBJ represents the surface where the subject is located, and STO represents the stop surface.

It can be seen from Table 3 that the object side and the image side of any one of the first lens L1 to the seventh lens L7 are aspheric surfaces, and the surface type x of each aspheric lens can be defined by but not limited to the following aspheric surface formula:

Among them, x is the distance vector height of the aspheric surface from the apex of the aspheric surface at the position of height h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is shown in Table 3 The reciprocal of the radius of curvature R in the middle); k is the cone coefficient (given in Table 3); Ai is the correction coefficient of the i-th order of the aspheric surface. Table 4 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of each aspheric surface.

table 3

FIG. 6 shows the axial chromatic aberration curve of the optical imaging lens of Example 2, which indicates that the focal points of light rays of different wavelengths passing through the lens deviate. FIG. 7 shows the astigmatism curves of the optical imaging lens of Embodiment 2, which represent meridional image plane curvature and sagittal image plane curvature. FIG. 8 shows the distortion curves of the optical imaging lens of Embodiment 2, which represent the distortion values corresponding to different viewing angles. FIG. 9 shows a chromatic aberration curve of magnification of the optical imaging lens of Embodiment 2, which represents the deviation of different image heights on the imaging plane S17 after the light passes through the lens. According to FIG. 6 to FIG. 9 , it can be seen that the optical imaging lens provided by Embodiment 2 can achieve good imaging quality.

Table 4

The embodiment of the present application also provides a camera module, the camera module is equipped with the optical imaging lens described above. The implementation of the above-mentioned embodiment of the optical imaging lens is also applicable to the embodiment of the camera module, and can achieve the same technical effect, and will not be repeated here.

Other configurations and operations of the camera module according to the embodiments of the present application are known to those skilled in the art and will not be described in detail here.

The embodiment of the present application also provides an electronic device, the electronic device is equipped with the camera module described above.

Other configurations and operations of the electronic device according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

In the embodiment of the present application, the electronic device may be a mobile phone, a tablet computer, a notebook computer, a handheld computer, a vehicle electronic device, a wearable device, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a netbook or a personal digital assistant ( personal digital assistant, PDA), etc.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may be made to the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the scope of protection of this application

Those skilled in the art should understand that the above-mentioned embodiments are illustrative rather than restrictive. Different technical features in different embodiments can be combined to achieve beneficial effects. Those skilled in the art should be able to understand and implement other modified embodiments of the disclosed embodiments on the basis of studying the drawings, specification and claims. In the claims, the term "comprising" does not exclude other means or steps; when an item is not modified with a quantitative word, it is intended to include one/more/kind of item, and can be used with "one/more/kind of item" "Use interchangeably"; the terms "first" and "second" are used to indicate names but not to indicate any specific order. Any reference signs in the claims shall not be construed as limiting the scope of protection. The functions of multiple parts appearing in the claims can be realized by a single hardware or software module. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

A method for placing an order, comprising: sequentially including from the object side to the image side along the optical axis:

The first lens has negative refractive power, its object side is convex, and its image side is concave;

a second lens having optical power;

The third lens has positive refractive power, its object side is convex, and its image side is convex;

The fourth lens has negative refractive power, its object side is convex, and its image side is concave;

a fifth lens having negative optical power;

a sixth lens element having positive optical power, convex on the object side and convex on the image side; and

The seventh lens has positive refractive power, its object side is convex, and its image side is convex;

The maximum half field angle of the optical imaging lens is greater than or equal to 64.5°;

The Abbe number of the second lens is V2, and the radius of curvature of the image side of the second lens is R4, 2.5<V2/R4<3.5.
The method for placing an order according to claim 1, wherein the value of the radius of curvature of the object side of the first lens is R1, and the value of the radius of curvature of the image side of the first lens is R2, 0.5<(R1-R2) /(R1+R2)<2.5.
The optical imaging lens according to claim 1, wherein the value of the radius of curvature of the object side of the second lens is R3, the value of the radius of curvature of the image side of the second lens is R4, -1.5<R4/R3< 1.5.
The optical imaging lens according to claim 1, wherein the effective focal length of the first lens is f1, the effective focal length of the second lens is f2, -4<f2/f1<-5; and/or ,

The effective focal length of the third lens is f3, the effective focal length of the fourth lens is f4, and −4<f4/f3<−3.
The optical imaging lens according to claim 1, wherein the distance between the object side of the first lens and the imaging surface of the optical imaging lens on the optical axis is TTL, and the effective focal length of the sixth lens is The value is f6, 1<TTL/f6<2.5.
The optical imaging lens according to claim 1, wherein the value of the radius of curvature of the object side of the third lens is R5, the value of the radius of curvature of the image side of the third lens is R6, and -2<R5/R6< -1.5.
The optical imaging lens according to claim 1, wherein the central thickness value of the first lens on the optical axis is CT1, and the distance between the first lens and the second lens is on the optical axis The air separation distance value of T12, 1.5<T12/CT1<3; and/or,

The central thickness value of the third lens on the optical axis is CT3, the air gap distance between the third lens and the fourth lens on the optical axis is T34, 20<CT3/T34 <21; and/or,

The central thickness value of the fourth lens on the optical axis is CT4, the air gap distance between the fourth lens and the fifth lens on the optical axis is T45, 0.5<CT4/T45 <1.
The optical imaging lens according to claim 1, wherein the second lens has positive refractive power, its object side is convex, and its image side is concave; the object side of the fifth lens is concave, and its image side is convex ;or,

The second lens has negative refractive power, its object side is concave, and its image side is concave; the object side of the fifth lens is concave, and its image side is concave.
A camera module, comprising the optical imaging lens according to any one of claims 1-8.
An electronic device comprising the camera module according to claim 9.