CN113933965B

CN113933965B - Optical lens, camera module and electronic equipment

Info

Publication number: CN113933965B
Application number: CN202111193435.9A
Authority: CN
Inventors: 党绪文; 刘彬彬; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2023-07-04
Anticipated expiration: 2041-10-13
Also published as: CN113933965A

Abstract

The invention discloses an optical lens, an image pickup module and electronic equipment, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from an object side to an image side along an optical axis, and the optical lens satisfies the following relational expression: TTL/ImgH/f is more than 0.21/mm and less than 0.29/mm, and FNO is more than 1.75 and less than 1.9; wherein, TTL is the distance between the object side surface of the first lens and the image surface of the optical lens on the optical axis, imgH is the radius of the effective imaging circle of the optical lens, f is the effective focal length of the optical lens, and FNO is the f-number of the optical lens. Therefore, the optical lens has smaller overall length, larger effective imaging circle radius and larger effective focal length, and when the optical lens is applied to a camera module, the larger effective imaging circle radius can be matched with a photosensitive chip with larger photosensitive area, so that the optical lens can meet the miniaturization design and has the imaging effect of higher pixels.

Description

Optical lens, camera module and electronic equipment

Technical Field

The present invention relates to the field of optical imaging technologies, and in particular, to an optical lens, a camera module, and an electronic device.

Background

In the related art, the imaging quality of the optical lens is improved by increasing the number of lenses, but increasing the number of lenses tends to result in a larger size of the optical lens in the optical axis direction, and it is difficult to realize a miniaturized design of the optical lens. How to realize the miniaturization design of the optical lens and ensure the better imaging quality of the optical lens at the same time is a problem to be solved at present.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, an imaging module and electronic equipment, wherein the optical lens can meet the miniaturization design and simultaneously has better imaging quality.

In order to achieve the above object, in a first aspect, an embodiment of the present invention discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens, which are disposed in order from an object side to an image side along an optical axis; the first lens element with positive refractive power has a convex object-side surface at a paraxial region; the second lens element with negative refractive power has a concave image-side surface at a paraxial region; the third lens and the fourth lens have refractive power; the fifth lens element with refractive power has a concave image-side surface at a paraxial region; the sixth lens element with refractive power has a convex object-side surface at a paraxial region; the seventh lens element with refractive power has a concave object-side surface at a circumference; the eighth lens element with refractive power has a concave object-side surface and a convex image-side surface at a circumference thereof; the ninth lens element with negative refractive power has a concave image-side surface at a paraxial region and a convex image-side surface at a circumferential region; at least one surface of at least one of the first to ninth lenses is an aspherical surface; the optical lens satisfies the following relation: TTL/ImgH/f is more than 0.21/mm and less than 0.29/mm, and FNO is more than 1.75 and less than 1.9; wherein TTL is the distance from the object side surface of the first lens element to the image plane of the optical lens element on the optical axis, that is, the total length of the optical lens element, imgH is the radius of the effective imaging circle of the optical lens element, f is the effective focal length of the optical lens element, and FNO is the f-number of the optical lens element. Therefore, the ratio among the total length, the effective imaging circle radius and the focal length of the optical lens can be reasonably limited, so that the optical lens has smaller total length, larger effective imaging circle radius and larger effective focal length, and when the optical lens is applied to a camera module, the larger effective imaging circle radius can be matched with a photosensitive chip with larger photosensitive area, thereby ensuring that the optical lens has imaging effect of higher pixels while meeting the miniaturization design.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: R31/R32 is more than 0.85 and less than 2.2; wherein R31 is a radius of curvature of the object side surface of the third lens element at the optical axis, and R32 is a radius of curvature of the image side surface of the third lens element at the optical axis. In this way, the radii of curvature of the object side and the image side of the third lens can be constrained, so that the focal length of the third lens can be better controlled. Meanwhile, the curvature radius of the object side surface and the image side surface of the third lens is controlled within a reasonable range, so that a better deflection effect on light rays can be achieved, especially when the third lens is an aspheric lens, the deflection effect on the light rays is easier to improve, in addition, the light and thin design of the third lens is facilitated, meanwhile, the processing sensitivity of the third lens can be reduced, and the processing difficulty of the third lens is reduced.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 3.1 < (Sd52+Sd62+Sd72)/(Ct5+Ct6+Ct7) < 6.8; wherein SD52 is the maximum effective half-caliber of the image side surface of the fifth lens element, SD62 is the maximum effective half-caliber of the image side surface of the sixth lens element, SD72 is the maximum effective half-caliber of the image side surface of the seventh lens element, CT5 is the thickness of the fifth lens element on the optical axis, i.e., the center thickness of the fifth lens element, CT6 is the thickness of the sixth lens element on the optical axis, and CT7 is the thickness of the seventh lens element on the optical axis. In this way, the ratio of the sum of the maximum effective half calibers of the image side surface of the fifth lens, the image side surface of the sixth lens and the image side surface of the seventh lens to the sum of the thicknesses of the fifth lens, the sixth lens and the seventh lens on the optical axis can be reasonably controlled, and the rationality of the thickness arrangement of the fifth lens, the sixth lens and the seventh lens is ensured, so that the processing rationality of the fifth lens, the sixth lens and the seventh lens is improved.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.2 < |f12/f| < 32; wherein f12 is a combined focal length of the first lens and the second lens. Thus, the ratio of the combined focal length of the first lens and the second lens to the effective focal length of the optical lens can be controlled, and the introduction of aberration is reduced. In addition, when the first lens and the second lens adopt aspheric lenses, the first lens and the second lens are favorable for converging light rays rapidly, the paraxial light rays are refracted at a low deflection angle, the introduction of spherical aberration is reduced, converging marginal light rays are favorable for entering the optical lens, and the optical lens has a reasonable field angle.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: f36/f is less than 1.6 and less than 3.1; wherein f36 is a combined focal length of the third lens, the fourth lens, the fifth lens, and the sixth lens. The combined focal length of the third lens, the fourth lens, the fifth lens and the sixth lens can be reasonably distributed by meeting the relation, and the volumes of the third lens, the fourth lens, the fifth lens and the sixth lens can be favorably controlled, so that the miniaturization design of the optical lens is realized. Meanwhile, as the third lens, the fourth lens, the fifth lens and the sixth lens are positioned in the middle of the optical lens, the four lenses are kept to have reasonable focal lengths, so that the deflection of incident light rays with large angles is facilitated, the light rays smoothly enter the seventh lens, the aberration of the marginal view field is controlled in a reasonable range, and the imaging quality of the marginal view field of the optical lens is further improved.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.14 < (CT4+CT5+CT6)/TTL < 0.24; wherein, CT4 is the thickness of the fourth lens element on the optical axis, CT5 is the thickness of the fifth lens element on the optical axis, and CT6 is the thickness of the sixth lens element on the optical axis. In this way, the fourth lens, the fifth lens and the sixth lens have reasonable center thicknesses by controlling the duty ratio of the fourth lens, the fifth lens and the sixth lens to the total length of the optical lens, thereby being beneficial to realizing the miniaturization of the optical lens and facilitating the molding and the assembly of the fourth lens, the fifth lens and the sixth lens.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: CT9/ImgH is more than 0.08 and less than 0.12; wherein CT9 is the thickness of the ninth lens on the optical axis. The relation is satisfied, and the ratio of the center thickness of the ninth lens to the effective imaging radius of the optical lens can be reasonably controlled, so that the optical lens has a larger image plane, the center thickness of the ninth lens is reasonable, the processing sensitivity of the ninth lens is reduced, and the problem that the center thickness of the ninth lens is overlarge to introduce larger field curvature can be avoided.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0 < |f78/(R71-R81) | < 1.3; wherein f78 is a combined focal length of the seventh lens and the eighth lens, R71 is a radius of curvature of an object side surface of the seventh lens at the optical axis, and R81 is a radius of curvature of an object side surface of the eighth lens at the optical axis. The relation is satisfied, the combined focal length of the seventh lens and the eighth lens, the curvature radius of the seventh lens and the curvature radius of the eighth lens can be reasonably controlled, and meanwhile, the aspheric characteristics of the seventh lens and the eighth lens can be better utilized, so that the seventh lens and the eighth lens have reasonable surface-shaped trend, and therefore, the optical lens has good deflection effect and aberration correction capability on light rays of inner and outer fields, the aberration of the whole field of view can be well balanced, and good resolution can be obtained in the whole field of view by matching with the integral nine-piece optical lens.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: CT9/BF is more than 0.4 and less than 0.79; wherein CT9 is the thickness of the ninth lens element on the optical axis, BF is the minimum distance from the image side surface of the ninth lens element to the image surface of the optical lens element on the optical axis. The method satisfies the relation, can reasonably control the distance between the ninth lens and the image surface, is favorable for reducing the molding difficulty and the processing surface type error of the ninth lens and controlling distortion, thereby improving the imaging quality of the optical lens.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 19.3< Vd2<25; wherein Vd2 is an abbe number of the second lens. The relation is satisfied, the Abbe number of the second lens can be controlled within a reasonable range, when the second lens is an aspheric surface, the aberration and the chromatic aberration from the center to the edge view field can be effectively controlled, the purple fringing effect of the optical lens can be reduced, and the influence on the imaging purity of the optical lens can be reduced.

In a second aspect, the present invention discloses an image capturing module, where the image capturing module includes a photosensitive chip and the optical lens described in the first aspect, and the photosensitive chip is disposed on an image side of the optical lens. The imaging module with the optical lens of the first aspect has all the technical effects of the optical lens of the first aspect, namely, the optical lens has smaller overall length, larger effective imaging radius and effective focal length, so that the imaging module can be matched with a photosensitive chip with larger photosensitive area, and the imaging effect of higher pixels is ensured while the miniaturization design of the optical lens is satisfied.

In a third aspect, the present invention discloses an electronic device, which includes the camera module set described in the second aspect, where the camera module set is disposed on the housing. The electronic device having the image capturing module according to the second aspect also has all the technical effects of the optical lens according to the first aspect. That is, the optical lens of the electronic device has a smaller overall length, a larger effective imaging radius and an effective focal length, so that a photosensitive chip with a larger photosensitive area can be matched, and the optical lens can meet the miniaturization design and has a higher imaging effect of pixels.

Compared with the prior art, the embodiment of the invention has the beneficial effects that:

according to the optical lens, the camera module and the electronic equipment provided by the embodiment, as the optical lens meets the requirements of 0.21 < TTL/ImgH/f < 0.29 and 1.75 < FNO < 1.9, the total length of the optical lens (namely, the distance from the object side surface of the first lens to the image surface of the optical lens on the optical axis), the effective imaging radius and the ratio between the focal lengths are reasonably limited, and the optical lens has smaller total length, larger effective imaging radius and larger effective focal length, so that when the optical lens is applied to the camera module, the larger effective imaging radius can be matched with a photosensitive chip with larger photosensitive area, and the imaging effect of higher pixels is ensured while the optical lens meets the miniaturization design.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the structure of an optical lens disclosed in the present application;

fig. 2 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in the first embodiment of the present application;

FIG. 3 is a schematic view of an optical lens disclosed in a second embodiment of the present application;

fig. 4 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in the second embodiment of the present application;

fig. 5 is a schematic structural view of an optical lens disclosed in a third embodiment of the present application;

fig. 6 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in the third embodiment of the present application;

fig. 7 is a schematic structural view of an optical lens disclosed in a fourth embodiment of the present application;

fig. 8 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in the fourth embodiment of the present application;

fig. 9 is a schematic structural view of an optical lens disclosed in a fifth embodiment of the present application;

fig. 10 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in the fifth embodiment of the present application;

fig. 11 is a schematic structural view of an optical lens disclosed in a sixth embodiment of the present application;

Fig. 12 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in the sixth embodiment of the present application;

fig. 13 is a schematic structural view of an optical lens disclosed in a seventh embodiment of the present application;

fig. 14 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in the seventh embodiment of the present application;

FIG. 15 is a schematic view of the structure of the camera module disclosed in the present application;

fig. 16 is a schematic structural view of an electronic device disclosed in the present application.

Detailed Description

In the present disclosure, the terms "first," "second," and the like are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply relative importance or quantity of the indicated devices, elements, or components. Unless otherwise indicated, the meaning of "a plurality" is two or more.

The technical scheme of the invention will be further described with reference to the examples and the accompanying drawings.

Referring to fig. 1, the present application discloses an optical lens 100, wherein the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9, which are sequentially disposed from an object side to an image side along an optical axis o. In imaging, light enters the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7, the eighth lens element L8 and the ninth lens element L9 in order from the object side surface S1 of the first lens element L1, and finally is imaged on the imaging surface 101 of the optical lens assembly 100. Wherein the first lens element L1 has positive refractive power, the second lens element L2 and the ninth lens element L9 each have negative refractive power, and the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7 and the eighth lens element L8 each have positive refractive power (i.e., the refractive power can be positive or negative).

Further, the object-side surface S1 of the first lens element L1 is convex at the paraxial region o, the image-side surface S4 of the second lens element L2 is convex at the paraxial region o, the image-side surface S10 of the fifth lens element L5 is concave at the paraxial region o, the object-side surface S11 of the sixth lens element L6 is convex at the paraxial region o, the object-side surface S13 of the seventh lens element L7 is concave at the circumference, the object-side surface S15 and the image-side surface S16 of the eighth lens element L8 are concave and convex at the circumference, respectively, the image-side surface S18 of the ninth lens element L9 is concave at the paraxial region o, and the image-side surface S18 of the ninth lens element L9 is convex at the circumference.

By arranging the first lens L1 with positive refractive power, the total length of the optical lens is reduced, the trend of light rays is compressed, and therefore, spherical aberration is reduced, and the optical lens 100 can be miniaturized and has high imaging quality. By arranging the object side surface S1 of the first lens element L1 to be convex at the paraxial region o, the positive refractive power of the first lens element L1 is enhanced, and the light rays are collected conveniently, so that a reasonable light incident angle is further provided for introducing marginal light rays, and the optical lens assembly 100 has a reasonable angle of view. By arranging the second lens element L2 with negative refractive power and the image-side surface S4 thereof being concave, the light converging through the first lens element L1 can be gradually diffused, and the light deflection angle can be reduced. By arranging the image-side surface S10 of the fifth lens element L5 to be concave at the paraxial region o, the compactness between the lens elements is improved, and the processing sensitivity and the stray light risk of the image-side surface S10 of the fifth lens element L5 are reduced. By arranging the object-side surface S11 of the sixth lens element L6 to be convex at the paraxial region o, the object-side surface S11 of the sixth lens element L6 is constrained, and the object-side surface S11 of the sixth lens element L6 is prevented from being excessively bent, such that the difference between the thickness of the sixth lens element L6 at the optical axis o and the thickness of the edge of the sixth lens element L6 is relatively large, which is beneficial to reducing the processing sensitivity of the object-side surface S11 of the sixth lens element L6. The object side surfaces of the seventh lens element and the eighth lens element L8 are concave at the circumference, so that stray light is avoided, and the edge relative illuminance is improved. The image side surface S18 of the ninth lens element L9 is concave at a paraxial region thereof, which is beneficial to correcting distortion, astigmatism and field curvature, thereby improving imaging quality, and the image side surface of the ninth lens element L9 is convex at a peripheral region thereof, so that an incident angle of light on the image plane 101 of the optical lens 100 can be kept within a reasonable range, and the optical lens 100 can be more easily matched with a photosensitive chip of an image capturing module when applied to the image capturing module.

It is contemplated that the optical lens 100 may be applied to an electronic device such as an in-vehicle apparatus, a car recorder, or the like, or to an automobile. When the optical lens 100 is used as a camera on an automobile body, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 can be glass, so that the optical lens 100 has good optical effects and the influence of temperature on the lenses can be reduced. Of course, among the plurality of lenses of the optical lens 100, a part of the lenses may be made of glass, and a part of the lenses may be made of plastic, so that the processing cost of the lenses and the weight of the lenses can be reduced while the influence of the reduced temperature on the lenses is ensured to achieve a better imaging effect, thereby reducing the processing cost of the optical lens 100 and the overall weight of the optical lens 100.

In addition, it can be appreciated that when the optical lens 100 is applied to an electronic device such as a smart phone, a smart tablet, etc., the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 may be plastic, so as to reduce the overall weight of the optical lens 100.

Optionally, at least one surface of at least one of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 is aspheric, and the aspheric design can reduce the processing difficulty of the lens and facilitate control of the lens surface shape.

In some embodiments, the optical lens 100 further includes a diaphragm 102, and the diaphragm 102 may be an aperture diaphragm or a field diaphragm, which may be disposed between the object side of the optical lens 100 and the object side S1 of the first lens L1. It is to be understood that in other embodiments, the diaphragm 102 may be disposed between two adjacent lenses, for example, between the fourth lens L4 and the fifth lens L5, and the disposed position of the diaphragm 102 may be adjusted according to the actual situation, which is not particularly limited in this embodiment.

In some embodiments, the optical lens 100 further includes an optical filter L10, such as an ir cut filter, disposed between the image side surface S18 of the ninth lens L9 and the image plane 101 of the optical lens 100, so as to filter out the infrared light, but only allow the visible light to pass through, so as to avoid the problem of imaging distortion caused by the infrared light passing through the optical lens.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.21/mm < TTL/ImgH/f < 0.29/mm and 1.75 < FNO < 1.9, wherein TTL is the distance from the object side surface of the first lens L1 to the image plane 101 of the optical lens 100 on the optical axis o, namely the total length of the optical lens 100, imgH is the radius of the effective imaging circle of the optical lens 100, f is the effective focal length of the optical lens 100, and FNO is the f-number of the optical lens 100. The optical lens 100 satisfies the above relation, and can reasonably limit the ratio among the total length, the effective imaging circle radius and the focal length of the optical lens 100, wherein the optical lens 100 has a smaller total length, a larger effective imaging circle radius and an effective focal length, so that when the optical lens 100 is applied to an image pickup module, the larger effective imaging circle radius can be matched with a photosensitive chip with a larger photosensitive area, thereby ensuring that the optical lens 100 has an imaging effect of a higher pixel while meeting the miniaturization design. . When TTL/ImgH/f is more than or equal to 0.29/mm, the total length of the optical lens 100 is larger, the design requirement of miniaturization of the optical lens 100 cannot be met, the effective imaging circle radius and the effective focal length of the optical lens 100 are smaller, and large-field-angle design is difficult to realize. When TTL/ImgH/f is less than or equal to 0.21/mm, the total length of the optical lens 100 is smaller, the effective imaging radius and the effective focal length are larger, the processing difficulty is larger, and the lens is easy to generate the situation of surface distortion during processing, so that the production yield of the optical lens 100 is reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: R31/R32 is greater than 0.85 and less than 2.2, wherein R31 is the radius of curvature of the object-side surface S5 of the third lens element L3 at the optical axis o, and R32 is the radius of curvature of the image-side surface S6 of the third lens element L3 at the optical axis o. The optical lens 100 satisfies the above relation, and can constrain the radii of curvature of the object-side surface S5 and the image-side surface S6 of the third lens L3, so that the focal length of the third lens L3 can be better controlled, and the third lens L3 has a reasonable focal length. Meanwhile, the curvature radiuses of the object side surface S5 and the image side surface S6 of the third lens L3 are controlled to be in a reasonable range, so that a better deflection effect on light rays can be achieved, especially when the third lens L3 is an aspheric lens, the deflection effect on the light rays is easier to improve, in addition, the light and thin design of the third lens L3 is facilitated, meanwhile, the processing sensitivity of the third lens L3 can be reduced, and the processing difficulty of the third lens L3 is reduced. When R31/R32 is more than or equal to 2.2, the radius of curvature of the object side S5 of the third lens L3 is too large, and the processing sensitivity of the object side S5 of the third lens L3 is larger. When R31/R32 is less than or equal to 0.85, the radius of curvature of the image side S6 of the third lens element L3 is too large, and the processing sensitivity of the image side S6 of the third lens element L3 is relatively high.

In some embodiments, the optical lens 100 satisfies the following relationship: 3.1 < (Sd52+S62+S72)/(C5+C6+C7) < 6.8, wherein SD52 is the maximum effective half-caliber of the image side S10 of the fifth lens L5, SD62 is the maximum effective half-caliber of the image side S12 of the sixth lens L6, SD72 is the maximum effective half-caliber of the image side S14 of the seventh lens L7, CT5 is the thickness of the fifth lens L5 on the optical axis o, i.e., the center thickness of the fifth lens L5, CT6 is the thickness of the sixth lens L6 on the optical axis o, i.e., the center thickness of the sixth lens L6, CT7 is the thickness of the seventh lens L7 on the optical axis o, i.e., the center thickness of the seventh lens L7). When the optical lens 100 satisfies the above-mentioned relational expression, the ratio of the sum of the maximum effective half apertures of the image side surface S10 of the fifth lens L5, the image side surface S12 of the sixth lens L6, and the image side surface S14 of the seventh lens L7 to the sum of the center thicknesses of the fifth lens L5, the sixth lens L6, and the seventh lens L7 can be reasonably controlled, and the rationality of the thickness settings of the fifth lens L5, the sixth lens L6, and the seventh lens L7 can be ensured, thereby improving the workability of the fifth lens L5, the sixth lens L6, and the seventh lens L7. When (s52+s62+s72)/(ct5+ct6+ct7) > 6.8, the maximum effective half aperture of the image side surface S10 of the fifth lens L5, the image side surface S12 of the sixth lens L6, and the image side surface S14 of the seventh lens L7 of the optical lens 100 is larger, the center thicknesses of the fifth lens L5, the sixth lens L6, and the seventh lens L7 are smaller, so that the shapes of the fifth lens L5, the sixth lens L6, and the seventh lens L7 are relatively flat, which is unfavorable for injection molding, resulting in reduced processing accuracy of the fifth lens L5, the sixth lens L6, and the seventh lens L7. When (s52+s62+s72)/(ct5+ct6+ct7) +.3.1, the maximum effective half aperture of the image side surface S10 of the fifth lens L5, the image side surface S12 of the sixth lens L6, and the image side surface S14 of the seventh lens L7 of the optical lens 100 is smaller, the center thicknesses of the fifth lens L5, the sixth lens L6, and the seventh lens L7 are larger, so that the shape fluctuation of the fifth lens L5, the sixth lens L6, and the seventh lens L7 is larger, and further, the processing sensitivity of the fifth lens L5, the sixth lens L6, and the seventh lens L7 is higher.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.2 < |f12/f| < 32, wherein f12 is the combined focal length of the first lens L1 and the second lens L2. Since 1.2 < |f12/f| < 32, the ratio of the combined focal length of the first lens L1 and the second lens L2 to the effective focal length of the optical lens 100 can be controlled, which is advantageous in reducing the introduction of aberrations. In addition, when the first lens L1 and the second lens L2 adopt aspheric lenses, the first lens L1 and the second lens L2 are beneficial to rapidly converging light, refracting paraxial light at a low deflection angle, reducing introduction of spherical aberration, and facilitating converging marginal light to enter the optical lens 100, so that the optical lens 100 has a reasonable angle of view. When f12/f is more than or equal to 32, the focal power is too concentrated, and the light enters the first lens L1 and the second lens L2 to be quickly contracted, so that the light is too concentrated in the interior, and a region with high processing sensitivity is generated, and the assembly is not facilitated. When f12/f is less than or equal to 1.2, the combined focal length of the first lens L1 and the second lens L2 is smaller, and the deflection of the light rays with large angles is insufficient, so that the first lens L1 and the second lens L2 do not bear enough aberration correction amount, and the aberration balance distribution is not facilitated.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.6 < f36/f < 3.1, wherein f36 is the combined focal length of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6. Since the optical lens 100 satisfies the above relation, the combined focal lengths of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 can be reasonably distributed, which is beneficial to controlling the volumes of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6, so as to realize the miniaturization design of the optical lens 100. Meanwhile, since the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are located in the middle of the optical lens 100, maintaining the reasonable focal length of the four lenses is beneficial to deflecting incident light rays with large angles, so that the light rays smoothly enter the seventh lens L7, thereby being beneficial to controlling the aberration of the marginal view field in a reasonable range, and further improving the imaging quality of the marginal view field of the optical lens 100. When f36/f is more than or equal to 3.1, the combined focal length of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 is relatively high, the curvature radius is smaller, the surface type bending degree of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 is relatively high, and further the processing sensitivity of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 is relatively high. When f36/f is less than or equal to 1.6, the combined focal length of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 is smaller, and a sufficient refraction effect is not achieved in the optical lens 100, so that the balanced distribution of aberration is not facilitated.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.14 < (CT4+CT5+CT6)/TTL < 0.24, wherein CT4 is the thickness of the fourth lens L4 on the optical axis o, i.e. the center thickness of the fourth lens L4. Because the optical lens 100 satisfies 0.14 < (CT4+CT5+CT6)/TTL < 0.24, the duty ratio of the fourth lens L4, the fifth lens L5 and the sixth lens L6 to the total length of the optical lens 100 is controlled, so that the fourth lens L4, the fifth lens L5 and the sixth lens L6 have reasonable center thicknesses, the miniaturization of the optical lens 100 is facilitated, and the molding and the assembly of the fourth lens L4, the fifth lens L5 and the sixth lens L6 are facilitated. When (CT 4+ct5+ct 6)/TTL is greater than or equal to 0.24, the sum of the center thicknesses of the fourth lens L4, the fifth lens L5 and the sixth lens L6 is larger, so that it is difficult to realize the overall length of the smaller nine-piece optical lens 100, which is not beneficial to realizing the miniaturized design of the optical lens 100. When (CT 4+ct5+ct 6)/TTL is less than 0.19, the sum of the thicknesses of the centers of the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 is smaller, which results in difficulty in processing the lens element, and the structural strength of the lens element is smaller, difficulty in assembling is greater, and the production yield of the optical lens 100 is affected.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.08 < CT9/ImgH < 0.12, wherein CT9 is the thickness of the ninth lens L9 on the optical axis o, i.e. the center thickness of the ninth lens L9. Because the optical lens 100 satisfies that 0.08 < CT9/ImgH < 0.12, the ratio of the center thickness of the ninth lens L9 to the effective imaging radius of the optical lens 100 can be reasonably controlled, so that the center thickness of the ninth lens L9 is reasonable while the optical lens 100 has a larger image plane, the processing sensitivity of the ninth lens L9 is reduced, and the problem that the center thickness of the ninth lens L9 is too large to introduce larger curvature of field is also avoided. When CT9/ImgH is less than or equal to 0.08, the center thickness of the ninth lens L9 is smaller, the molding effect of the ninth lens L9 is seriously affected, and the ninth lens L9 is not easy to mold. When CT9/ImgH is more than or equal to 0.12, the center thickness of the ninth lens L9 is larger, which is not beneficial to shortening the total length of the optical lens 100, and thus is not beneficial to realizing the miniaturization design of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0 < |f78/(R71-R81) | < 1.3, wherein f78 is the combined focal length of the seventh lens element L7 and the eighth lens element L8, R71 is the radius of curvature of the object-side surface of the seventh lens element L7 at the optical axis o, and R81 is the radius of curvature of the object-side surface of the eighth lens element L8 at the optical axis o. Because the optical lens 100 satisfies the above relation, the combined focal length of the seventh lens L7 and the eighth lens L8, the radius of curvature of the seventh lens L7, and the radius of curvature of the eighth lens L8 can be reasonably controlled, and meanwhile, the aspheric characteristics of the seventh lens L7 and the eighth lens L8 can be better utilized, so that the seventh lens L7 and the eighth lens L8 have reasonable surface-shaped trend, and thus, the optical lens has good deflection effect and aberration correction capability on light rays with inner and outer fields of view, the aberration of the full field of view can be well balanced, and good resolution can be obtained in the full field of view by matching with the overall nine-piece optical lens 100. When the I f 78/(R71-R81) I is not less than 1.3, the difference between the radius of curvature of the object side surface of the seventh lens L7 and the radius of curvature of the object side surface of the eighth lens L8 is smaller, the seventh lens element L7 and the eighth lens element L8 are not likely to exhibit aspherical characteristics and perform edge aberration balance.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.4 < CT9/BF < 0.79, where BF is the minimum distance in the optical axis o direction from the image side S18 of the ninth lens L9 to the image plane 101 of the optical lens 100, i.e., back focus. When the optical lens 100 satisfies 0.4 < CT9/BF < 0.79, the distances from the ninth lens L9 and the ninth lens L9 to the image plane 101 can be reasonably controlled, which is favorable for reducing the molding difficulty and the processing plane type error of the ninth lens L9, and is favorable for controlling distortion, thereby improving the imaging quality of the optical lens 100, and the optical lens 100 can be prevented from influencing the assembly and the production yield of the image pickup module due to the fact that the ninth lens L9 is too close to the photosensitive chip when being applied to the image pickup module due to the fact that the ninth lens L9 has a reasonable distance from the image plane 101, and is favorable for improving the matching property of the optical lens 100 and different photosensitive chips. When CT9/BF is greater than or equal to 0.79, the center thickness of the ninth lens L9 is thicker, resulting in processing sensitivity of the ninth lens L9, and the processing difficulty of the ninth lens L9 is greater, and the shortening of the total length of the optical lens 100 is not facilitated, so that the miniaturization design of the optical lens 100 is not facilitated. When CT9/BF is less than or equal to 0.4, the distance from the ninth lens L9 to the image plane 101 is larger, which is not beneficial to the miniaturization design of the optical lens 100, and when the optical lens 100 is applied to the camera module, is not beneficial to the miniaturization design of the camera module.

In some embodiments, the optical lens 100100 satisfies the following relationship: 19.3< Vd2<25, wherein Vd2 is the Abbe number of the second lens L2. Because the optical lens 100 satisfies 19.3< vd2<25, the abbe number of the second lens L2 can be controlled within a reasonable range, when the second lens L2 is an aspheric surface, the aberration from the center to the edge view field can be effectively controlled, the ultraviolet effect of the optical lens 100 can be reduced, and the influence on the imaging purity of the optical lens 100 can be reduced. When Vd2 is more than or equal to 25, the Abbe number is too large, the refractive index is lower, and the light deflection and chromatic aberration compensation are not facilitated at the position of the second lens L2. When Vd2 is less than or equal to 19.3, the Abbe number is too small, the refractive index is higher, the material use cost is suddenly increased, and the high Abbe number is unfavorable for maintaining the reasonable thickness of the second lens L2.

The optical lens 100 of the present embodiment will be described in detail below with reference to specific parameters.

First embodiment

As shown in fig. 1, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9, which are disposed in order from an object side to an image side along an optical axis o. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 can be referred to the above embodiments, and will not be described herein.

Further, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 and the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power, the seventh lens element L7 with negative refractive power, the eighth lens element L8 with positive refractive power, and the ninth lens element L9 with negative refractive power.

Further, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex and concave at the paraxial region o, respectively, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the circumference. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the paraxial region o, respectively, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the peripheral region o, respectively. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the paraxial region o, respectively, and the object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the peripheral region. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex at the paraxial region o, respectively, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex at the peripheral region. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave at the paraxial region o, and the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave and convex at the peripheral region. The object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are convex at the paraxial region o, and the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are concave and convex at the peripheral region. The object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are concave and convex at the paraxial region o, respectively, and the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are concave and convex at the peripheral region. The object-side surface S15 and the image-side surface S16 of the eighth lens element L8 are convex at the paraxial region o, and the object-side surface S15 and the image-side surface S16 of the eighth lens element L8 are concave and convex at the peripheral region. The object-side surface S17 and the image-side surface S18 of the ninth lens element L9 are concave at the paraxial region o, and the object-side surface S17 and the image-side surface S18 of the ninth lens element L9 are concave and convex at the peripheral region.

Specifically, taking the effective focal length f=6.57 mm of the optical lens 100, the aperture size fno=1.89 of the optical lens 100, the field angle fov= 78.67deg of the optical lens 100, and the total optical length ttl=8.11 mm of the optical lens 100 as examples, other parameters of the optical lens 100 are given in table 1 below. The elements from the object side to the image side along the optical axis o of the optical lens 100 are sequentially arranged in the order of the elements from top to bottom in table 1. In the same lens element, the surface with smaller surface number is the object side surface of the lens element, and the surface with larger surface number is the image side surface of the lens element, and the surface numbers 1 and 2 correspond to the object side surface S1 and the image side surface S2 of the first lens element L1, respectively. The radius Y in table 1 is the radius of curvature of the object or image side of the corresponding surface number at the paraxial region o. The first value in the "thickness" parameter row of the lens is the thickness of the lens on the optical axis o, and the second value is the distance from the image side surface of the lens to the latter surface on the optical axis o. The value of the diaphragm 102 in the "thickness" parameter row is the distance between the diaphragm 102 and the vertex of the subsequent surface (the vertex refers to the intersection point of the surface and the optical axis o) on the optical axis o, and the direction from the object side surface S1 of the first lens L1 to the image side surface of the last lens is the positive direction of the optical axis o by default, when the value is negative, the diaphragm 102 is indicated to be arranged on the right side of the vertex of the subsequent surface, and when the thickness of the diaphragm 102 is positive, the diaphragm 102 is arranged on the left side of the vertex of the subsequent surface. It is understood that the units of Y radius, thickness, and focal length in Table 1 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 1 was 587nm.

TABLE 1

In the first embodiment, the object side surface and the image side surface of the first lens L1 to the ninth lens L9 are aspheric, and the surface shape x of the aspheric lens can be defined by, but not limited to, the following aspheric formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis o direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of the radius R of Y in table 1 above); k is a conic coefficient; ai is a correction coefficient corresponding to the i-th higher term of the aspherical surface. The higher order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each of the aspherical mirrors S1-S18 in the first embodiment are given in Table 2.

TABLE 2

/>

Referring to fig. 2 (a), fig. 2 (a) shows the optical spherical aberration curves of the optical lens 100 of the first embodiment at 486nm, 587nm and 656 nm. In fig. 2 (a), the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the optical lens 100 in the first embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality.

Referring to fig. 2 (B), fig. 2 (B) is a light astigmatism diagram of the optical lens 100 at a wavelength of 587nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents focus offset, and the ordinate along the Y-axis direction represents image height in mm. The astigmatic curves represent the meridional imaging plane curvature T and the sagittal imaging plane curvature S, and it can be seen from fig. 2 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

Referring to fig. 2 (C), fig. 2 (C) is a graph of distortion of the optical lens 100 at a wavelength of 587nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents focus offset, and the ordinate along the Y-axis direction represents image height in mm. As can be seen from (C) of fig. 2, the distortion of the optical lens 100 can be corrected at a wavelength of 587 nm.

Second embodiment

Referring to fig. 3, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9, which are disposed in order from an object side to an image side along an optical axis o. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 can be referred to the above embodiments, and will not be described herein.

Further, in the second embodiment, the refractive power of each lens is the same as that of each lens in the first embodiment. Furthermore, the surface shapes of the lenses at the paraxial region o and at the circumference are different from those of the first embodiment in that: the object-side surface S5 and the image-side surface S6 of the third lens element L3 are concave and convex at the paraxial region o, respectively, and the object-side surface S5 and the circumference of the third lens element L3 are convex. The image-side surface S12 of the sixth lens element L6 is concave at the paraxial region o, and the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are convex and concave at the circumference.

In the second embodiment, the effective focal length f=6.19 mm of the optical lens 100, the aperture size fno=1.89 of the optical lens 100, the fov= 86.01deg of the field angle of the optical lens 100, and the total optical length ttl=7.98 mm of the optical lens 100 are taken as examples.

The other parameters in the second embodiment are given in the following table 3, and the definition of the parameters can be obtained from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 3 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 3 was 587nm.

TABLE 3 Table 3

/>

In the second embodiment, table 4 gives the higher order coefficients that can be used for each aspherical surface in the second embodiment, where each aspherical surface profile can be defined by the formula given in the first embodiment.

TABLE 4 Table 4

Referring to fig. 4, as can be seen from the graph of (a) optical spherical aberration in fig. 4, the graph of (B) optical spherical aberration in fig. 4, and the graph of (C) distortion in fig. 4, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B) and fig. 4 (C) may refer to the contents described in the first embodiment in fig. 2 (a), fig. 2 (B) and fig. 2 (C), and will not be repeated here.

Third embodiment

Referring to fig. 5, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9, which are disposed in order from an object side to an image side along an optical axis o. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 can be referred to the above embodiments, and will not be described herein.

Further, in the third embodiment, the refractive powers of the respective lenses are different from those of the first embodiment in that: the third lens element L3 with negative refractive power, and the fifth lens element L5 with positive refractive power. Furthermore, the surface shapes of the lenses at the paraxial region o and at the circumference are different from those of the first embodiment in that: the object side surface S5 of the third lens L3 is concave at the circumference. The object side surface S7 of the fourth lens element L4 is convex at a paraxial region o. The object side surface S9 of the fifth lens element L5 is convex at a paraxial region o. The sixth lens element L6 has a concave image-side surface S12 at a paraxial region o. The image side surface S14 of the seventh lens L7 is concave at the circumference.

In the third embodiment, the effective focal length f=5.99 mm of the optical lens 100, the aperture size fno=1.87 of the optical lens 100, the field angle fov=92.52 deg of the optical lens 100, and the total optical length ttl=7.97 mm of the optical lens 100 are taken as examples.

The other parameters in the third embodiment are given in the following table 5, and the definition of the parameters can be obtained from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 5 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 5 was 587nm.

TABLE 5

/>

In the third embodiment, table 6 gives the higher order coefficients that can be used for each aspherical surface in the third embodiment, where each aspherical surface profile can be defined by the formula given in the first embodiment.

TABLE 6

Referring to fig. 6, as can be seen from the graph of (a) optical spherical aberration in fig. 6, the graph of (B) optical spherical aberration in fig. 6, and the graph of (C) distortion in fig. 6, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 6 (a), 6 (B) and 6 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the details are not repeated here.

Fourth embodiment

Referring to fig. 7, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9, which are disposed in order from an object side to an image side along an optical axis o. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 can be referred to the above embodiments, and will not be described herein.

Further, in the fourth embodiment, the refractive power of each lens element is different from that of the first embodiment in that the third lens element L3 has negative refractive power and the fifth lens element L5 has positive refractive power. Furthermore, the surface shapes of the lenses at the paraxial region o and at the circumference are different from those of the first embodiment in that: the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex and concave at a paraxial region o, the object-side surface S9 of the fifth lens element L5 is convex at the paraxial region o, and the image-side surface S10 of the fifth lens element L5 is concave at a peripheral region. The object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are both convex at the paraxial region o, and the image-side surface S14 of the seventh lens element L7 is concave at the peripheral region. The object side surface S15 of the eighth lens element L8 is concave at the paraxial region o.

In the fourth embodiment, the effective focal length f=5.78 mm of the optical lens 100, the aperture size fno=1.87 of the optical lens 100, the field angle fov= 91.59deg of the optical lens 100, and the total optical length ttl=7.60 mm of the optical lens 100 are taken as examples.

The other parameters in the fourth embodiment are given in the following table 7, and the definition of the parameters can be obtained from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 7 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 7 was 587nm.

TABLE 7

In the fourth embodiment, table 8 gives the higher order term coefficients that can be used for each aspherical surface in the fourth embodiment, where each aspherical surface profile can be defined by the formula given in the first embodiment.

TABLE 8

/>

Referring to fig. 8, as can be seen from the (a) light spherical aberration graph in fig. 8, the (B) light astigmatic graph in fig. 8, and the (C) distortion graph in fig. 8, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 8 (a), 8 (B) and 8 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the details are not repeated here.

Fifth embodiment

Referring to fig. 9, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9, which are disposed in order from an object side to an image side along an optical axis o. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 can be referred to the above embodiments, and will not be described herein.

Further, in the fifth embodiment, the refractive power of each lens element is different from that of the first embodiment in that the third lens element L3 has negative refractive power. Furthermore, the surface shapes of the lenses at the paraxial region o and at the circumference are different from those of the first embodiment in that: the object-side surface S5 of the third lens element L3 is concave at the circumference, the object-side surface S7 of the fourth lens element L4 is convex at the paraxial region o, and the object-side surface S7 of the fourth lens element L4 is convex at the circumference. The object-side surface S9 of the fifth lens element L5 is convex at a paraxial region o, and the image-side surface S10 of the fifth lens element L5 is concave at a circumference. The object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are convex and concave at the paraxial region o. The object side surface S15 of the eighth lens element L8 is concave at the paraxial region o.

In the fifth embodiment, the effective focal length f=5.58 mm of the optical lens 100, the aperture size fno=1.82 of the optical lens 100, the field angle fov= 93.39deg of the optical lens 100, and the total optical length ttl=7.40 mm of the optical lens 100 are taken as examples.

The other parameters in the fifth embodiment are given in the following table 9, and the definition of the parameters can be obtained from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 9 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 9 was 587nm.

TABLE 9

In the fifth embodiment, table 10 gives the higher order term coefficients that can be used for each aspherical surface in the fifth embodiment, where each aspherical surface profile can be defined by the formula given in the first embodiment.

Table 10

/>

Referring to fig. 10, as can be seen from the graph of (a) optical spherical aberration in fig. 10, the graph of (B) optical spherical aberration in fig. 10, and the graph of (C) distortion in fig. 10, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 10 (a), 10 (B) and 10 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the description thereof will be omitted.

Sixth embodiment

Referring to fig. 11, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9, which are disposed in order from an object side to an image side along an optical axis o. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 can be referred to the above embodiments, and will not be described herein.

Further, in the sixth embodiment, the refractive power of each lens element is different from that of the first embodiment in that the sixth lens element L6 has negative refractive power, the seventh lens element L7 has positive refractive power, and the eighth lens element L8 has negative refractive power. Furthermore, the surface shapes of the lenses at the paraxial region o and at the circumference are different from those of the first embodiment in that: the image-side surface S2 of the first lens element L1 is concave at the circumference. The object-side surface S7 of the fourth lens element L4 is convex at a paraxial region o, and the object-side surface S7 of the fourth lens element L4 is convex at a peripheral region. The object-side surface S9 of the fifth lens element L5 is convex at a paraxial region o, and the image-side surface S10 of the fifth lens element L5 is convex at a circumference. The image-side surface S12 of the sixth lens element L6 is concave at the paraxial region o. The object side surface S13 of the seventh lens element L7 is convex at a paraxial region o. The image-side surface S16 of the eighth lens element L8 is concave at the paraxial region o. The object side surface S17 of the ninth lens element L9 is convex at a paraxial region o, and the object side surface S17 of the ninth lens element L9 is convex at a circumference.

In the sixth embodiment, the effective focal length f=5.38 mm of the optical lens 100, the aperture size fno=1.78 of the optical lens 100, the field angle fov=84.95 deg of the optical lens 100, and the total optical length ttl=7.77 mm of the optical lens 100 are taken as examples.

The other parameters in the sixth embodiment are given in the following table 11, and the definition of the parameters can be obtained from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 11 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 11 was 587nm.

TABLE 11

In the sixth embodiment, table 12 gives the higher order term coefficients that can be used for each aspherical surface in the sixth embodiment, where each aspherical surface profile can be defined by the formula given in the first embodiment.

Table 12

Referring to fig. 12, as can be seen from the graph of (a) optical spherical aberration in fig. 12, the graph of (B) optical spherical aberration in fig. 12, and the graph of (C) distortion in fig. 12, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 12 (a), 12 (B) and 12 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the description thereof will be omitted here.

Seventh embodiment

Referring to fig. 13, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9, which are disposed in order from an object side to an image side along an optical axis o. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 can be referred to the above embodiments, and will not be described herein.

Further, in the seventh embodiment, the refractive power of each lens element is different from that of the first embodiment in that the sixth lens element L6 has negative refractive power, the seventh lens element L7 has positive refractive power, and the eighth lens element L8 has negative refractive power. Furthermore, the surface shapes of the lenses at the paraxial region o and at the circumference are different from those of the first embodiment in that:

the object side surface S1 of the first lens L1 is concave at the circumference. The object side surface S3 of the second lens L2 is concave at the circumference. The image-side surface S6 of the third lens L3 is convex at the circumference. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex and concave at the paraxial region o, respectively, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex and concave at the peripheral region. The object-side surface S9 of the fifth lens element L5 is convex at a paraxial region o, and the image-side surface S10 of the fifth lens element L5 is concave at a circumference. The image-side surface S12 of the sixth lens element L6 is concave at the paraxial region o. The image-side surface S16 of the eighth lens element L8 is concave at the paraxial region o. The object side surface S17 of the ninth lens L9 is convex at the paraxial region o.

In the seventh embodiment, the effective focal length f=5.76 mm of the optical lens 100, the aperture size fno=1.78 of the optical lens 100, the field angle fov= 86.39deg of the optical lens 100, and the total optical length ttl=7.66 mm of the optical lens 100 are taken as examples.

The other parameters in the seventh embodiment are given in the following table 13, and the definition of the parameters can be obtained from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 13 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 13 was 587nm.

TABLE 13

In the seventh embodiment, table 14 gives the higher order coefficients that can be used for each aspherical surface in the seventh embodiment, where each aspherical surface profile can be defined by the formula given in the first embodiment.

TABLE 14

Referring to fig. 14, as can be seen from the graph of (a) optical spherical aberration in fig. 14, the graph of (B) optical spherical aberration in fig. 14, and the graph of (C) distortion in fig. 14, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 14 (a), 14 (B) and 14 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the description thereof will not be repeated here.

Referring to table 15, table 15 is a summary of the ratios of the relationships in the first embodiment to the seventh embodiment of the present application.

TABLE 15

Referring to fig. 15, the present application further discloses an image capturing module, where the image capturing module 200 includes a photosensitive chip 201 and the optical lens 100 according to any one of the first to seventh embodiments, and the photosensitive chip 201 is disposed on an image side of the optical lens 100. The optical lens 100 may be used to receive an optical signal of a subject and project the optical signal to the photo-sensing chip 201, and the photo-sensing chip 201 may be used to convert the optical signal corresponding to the subject into an image signal. And will not be described in detail here. It can be appreciated that the image capturing module 200 with the optical lens 100 has all the technical effects of the optical lens 100, that is, the optical lens 100 has a smaller overall length, a larger effective imaging radius and an effective focal length, so that a photosensitive chip with a larger photosensitive area can be matched, and the optical lens can have an imaging effect of a higher pixel while meeting the miniaturization design. Since the above technical effects are described in detail in the embodiment of the optical lens 100, the description thereof is omitted here.

Referring to fig. 16, the application further discloses an electronic device, where the electronic device 300 includes a housing 301 and the camera module 200 described above, and the camera module 200 is disposed in the housing 301 to obtain image information. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, etc. It can be appreciated that the electronic device 300 having the image capturing module 200 also has all the technical effects of the optical lens 100. That is, the optical lens 100 of the electronic device 300 has a smaller overall length, a larger effective imaging radius and an effective focal length, so that a photosensitive chip with a larger photosensitive area can be matched, and the optical lens can have a higher imaging effect of pixels while meeting the miniaturization design. Since the above technical effects are described in detail in the embodiment of the optical lens 100, the description thereof is omitted here.

The optical lens, the camera module, the electronic device and the automobile disclosed by the embodiment of the invention are described in detail, and specific examples are applied to explain the principle and the implementation mode of the invention, and the description of the above embodiments is only used for helping to understand the optical lens, the camera module, the electronic device and the automobile and the core ideas thereof; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present invention, the present disclosure should not be construed as limiting the present invention in summary.

Claims

1. An optical lens, characterized in that the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are arranged in order from an object side to an image side along an optical axis;

the first lens element with positive refractive power has a convex object-side surface at a paraxial region;

the second lens element with negative refractive power has a concave image-side surface at a paraxial region;

the third lens element with refractive power;

the fourth lens element with positive refractive power;

The fifth lens element with refractive power has a concave image-side surface at a paraxial region;

the sixth lens element with refractive power has a convex object-side surface at a paraxial region;

the seventh lens element with refractive power has a concave object-side surface at a circumference;

the eighth lens element with refractive power has a concave object-side surface and a convex image-side surface at a circumference thereof;

the ninth lens element with negative refractive power has a concave image-side surface at a paraxial region and a convex image-side surface at a circumferential region; at least one surface of at least one of the first to ninth lenses is an aspherical surface; nine lenses with refractive power;

the optical lens satisfies the following relation:

0.21

＜TTL/ ImgH /f＜0.29/>

1.75 < FNO < 1.9; R31/R32 is more than 0.85 and less than 2.2;19.3<Vd2<25；

Wherein TTL is a distance from an object side surface of the first lens element to an image surface of the optical lens element on the optical axis, imgH is a radius of an effective imaging circle of the optical lens element, f is an effective focal length of the optical lens element, FNO is an f-number of the optical lens element, R31 is a radius of curvature of an object side surface of the third lens element at the optical axis, R32 is a radius of curvature of an image side surface of the third lens element at the optical axis, and Vd2 is an abbe number of the second lens element.

2. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

3.1＜(SD52+SD62+SD72)/(CT5+CT6+CT7)＜6.8；

wherein SD52 is the maximum effective half-caliber of the image side surface of the fifth lens element, SD62 is the maximum effective half-caliber of the image side surface of the sixth lens element, SD72 is the maximum effective half-caliber of the image side surface of the seventh lens element, CT5 is the thickness of the fifth lens element on the optical axis, CT6 is the thickness of the sixth lens element on the optical axis, and CT7 is the thickness of the seventh lens element on the optical axis.

3. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

1.2＜|f12/f|＜32；

wherein f12 is a combined focal length of the first lens and the second lens.

4. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

1.6＜f36/f＜3.1；

wherein f36 is a combined focal length of the third lens, the fourth lens, the fifth lens, and the sixth lens.

5. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

0.14＜(CT4+CT5+CT6)/TTL＜0.24；

wherein, CT4 is the thickness of the fourth lens element on the optical axis, CT5 is the thickness of the fifth lens element on the optical axis, and CT6 is the thickness of the sixth lens element on the optical axis.

6. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

0.08＜CT9/ImgH＜0.12；

wherein CT9 is the thickness of the ninth lens on the optical axis.

7. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

0＜|f78/(R71-R81)|＜1.3；

wherein f78 is a combined focal length of the seventh lens and the eighth lens, R71 is a radius of curvature of an object side surface of the seventh lens at the optical axis, and R81 is a radius of curvature of an object side surface of the eighth lens at the optical axis.

8. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

0.4＜CT9/BF＜0.79；

wherein CT9 is the thickness of the ninth lens element on the optical axis, BF is the minimum distance between the image side surface of the ninth lens element and the image surface of the optical lens element on the optical axis.

9. An imaging module, wherein the imaging module comprises a photosensitive chip and the optical lens according to any one of claims 1 to 8, and the photosensitive chip is disposed on an image side of the optical lens.

10. An electronic device, comprising a housing and the camera module of claim 9, wherein the camera module is disposed on the housing.