CN113933965A

CN113933965A - Optical lens, camera module and electronic equipment

Info

Publication number: CN113933965A
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: 2022-01-14
Anticipated expiration: 2041-10-13
Also published as: CN113933965B

Abstract

The invention discloses an optical lens, a camera 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 arranged in sequence from an object side to an image side along an optical axis, and the optical lens meets the following relational expression: TTL/ImgH/f is more than 0.21/mm and less than 0.29/mm, FNO is more than 1.75 and less than 1.9; wherein, TTL is a distance on an optical axis from an object side surface of the first lens element to an image plane of the optical lens, ImgH is a radius of an effective imaging circle of the optical lens, f is an effective focal length of the optical lens, and FNO is an f-number of the optical lens. Like this, this optical lens has less overall length and great effective imaging circle radius and effective focal length, and when this optical lens was applied to the module of making a video recording, great effective imaging circle radius can match the great sensitive chip of photosensitive area to guarantee that optical lens still has the imaging effect of higher pixel when satisfying the miniaturized design.

Description

Optical lens, camera module and electronic equipment

Technical Field

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

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 large size of the optical lens in the optical axis direction, making it difficult to achieve a compact design of the optical lens. How to realize the miniaturization design of the optical lens and ensure that the optical lens has better imaging quality is a problem which needs to be solved urgently at present.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment.

In order to achieve the above object, in a first aspect, embodiments of the present invention disclose an optical lens including, in order from an object side to an image side along an optical axis, 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; the first lens element with positive refractive power has a convex object-side surface at paraxial region; the second lens element with negative refractive power has a concave image-side surface at paraxial region; the third lens element and the fourth lens element both 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 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 respective circumferential positions; the ninth lens element with negative refractive power has a concave image-side surface at a paraxial region thereof and a convex image-side surface at a circumference thereof; at least one surface of at least one of the first lens to the ninth lens 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, FNO is more than 1.75 and less than 1.9; wherein, TTL is a distance from an object side surface of the first lens element to an image plane of the optical lens on the optical axis, that is, a total length of the optical lens, ImgH is a radius of an effective imaging circle of the optical lens, f is an effective focal length of the optical lens, and FNO is an f-number of the optical lens. Like this, can rationally restrict optical lens's total length, effective imaging circle radius and the focal length between the ratio, make this optical lens have less total length and great effective imaging circle radius and effective focal length to when this optical lens is applied to the module of making a video recording, great effective imaging circle radius can match the great sensitive optical chip of photosensitive area, in order to guarantee that optical lens still has the imaging effect of higher pixel when satisfying the miniaturized design.

As an alternative implementation, 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 an object-side surface of the third lens element at the optical axis, and R32 is a radius of curvature of an image-side surface of the third lens element at the optical axis. In this way, the radii of curvature of the object-side surface and the image-side surface 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 curvature radius of the image side surface of the third lens are controlled within a reasonable range, so that a better deflection effect on light can be achieved, especially when the third lens is an aspheric lens, the deflection effect on the light can be improved more easily, 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, 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 aperture of the image-side surface of the fifth lens element, SD62 is the maximum effective half aperture of the image-side surface of the sixth lens element, SD72 is the maximum effective half aperture 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. Therefore, the ratio of the sum of the maximum effective semi-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, the reasonability of the thickness setting of the fifth lens, the sixth lens and the seventh lens is guaranteed, and the processing reasonability of the fifth lens, the sixth lens and the seventh lens is improved.

As an alternative implementation, 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 the combined focal length of the first lens and the second lens. Therefore, 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 favorably reduced. In addition, when the first lens and the second lens adopt aspheric lenses, the first lens and the second lens are favorable for rapidly converging light rays, paraxial light rays are refracted at a low deflection angle, introduction of spherical aberration is reduced, and the converging of marginal light rays into the optical lens is favorable for enabling the optical lens to have a reasonable field angle.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: f36/f is more 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 when the relational expression is satisfied, and the volume of the third lens, the volume of the fourth lens, the volume of the fifth lens and the volume of the sixth lens can be favorably controlled, so that the miniaturization design of the optical lens is realized. Meanwhile, the third lens, the fourth lens, the fifth lens and the sixth lens are located in the middle of the optical lens, so that the four lenses are kept to have reasonable focal lengths, deflection of large-angle incident light rays is facilitated, the light rays enter the seventh lens gently, aberration of the edge field is controlled within a reasonable range, and imaging quality of the edge field of the optical lens is improved.

As an alternative implementation, 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 a thickness of the fourth lens element on the optical axis, CT5 is a thickness of the fifth lens element on the optical axis, and CT6 is a thickness of the sixth lens element on the optical axis. Therefore, the ratio of the fourth lens, the fifth lens and the sixth lens to the total length of the optical lens is controlled, so that the fourth lens, the fifth lens and the sixth lens have reasonable center thicknesses, the optical lens is favorably miniaturized, and the fourth lens, the fifth lens and the sixth lens are conveniently molded and assembled.

As an alternative implementation, 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 element on the optical axis. Satisfy this relational expression, can rationally control the central thickness of ninth lens and optical lens's effective imaging circle radius's ratio to when making optical lens have great image plane, the central thickness of ninth lens is reasonable, in order to reduce the processing sensitivity of ninth lens, can also avoid the central thickness of ninth lens too big and introduce great field curvature's problem.

As an alternative implementation, 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. Satisfy this relational expression, can rationally control the combined focal length of seventh lens and eighth lens and the curvature radius of seventh lens and the curvature radius of eighth lens, can utilize the aspheric surface characteristic of seventh lens and eighth lens better simultaneously, make seventh lens and eighth lens have reasonable face type trend to the light of inside and outside field of vision has good deflection effect and aberration correction ability, make the aberration of full field of vision can better balance, cooperate holistic nine-piece formula optical lens, can obtain good power of resolving images in full field of vision.

As an alternative implementation, 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, and BF is the minimum distance from the image-side surface of the ninth lens element to the image plane of the optical lens element on the optical axis. Satisfy this relational expression, can rationally control the distance of ninth lens and ninth lens to image plane, be favorable to reducing the shaping degree of difficulty and the machined surface type error of ninth lens, be favorable to controlling the distortion, thereby promote optical lens's image quality, and have reasonable distance through ninth lens to image plane, can avoid optical lens when being applied to the module of making a video recording, ninth lens and sensitization chip are too close and influence the equipment of the module of making a video recording and the condition of production yield, be favorable to improving this optical lens and the matching nature of different sensitization chips.

As an alternative implementation, 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 the 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 chromatic aberration from the center to the edge field of view can be effectively controlled, the purple fringe effect of the optical lens can be weakened, and the influence on the imaging purity of the optical lens can be reduced.

In a second aspect, the present invention discloses a camera module, which includes a photosensitive chip and the optical lens according to the first aspect, wherein the photosensitive chip is disposed on an image side of the optical lens. The camera 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 a smaller total length, a larger effective imaging circle radius and an effective focal length, so that a photosensitive chip with a larger photosensitive area can be matched, and the optical lens is guaranteed to have an imaging effect of higher pixels while meeting the requirement of miniaturization design.

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

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

by adopting the optical lens, the camera module and the electronic device provided by the embodiment, because the optical lens meets the requirements that the TTL/ImgH/f is more than 0.21 and the FNO is more than 1.75 and less than 0.29, 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 circle radius and the ratio between the focal lengths are reasonably limited, and the optical lens has smaller total length, larger effective imaging circle radius and effective focal length, so that when the optical lens is applied to the 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 higher pixel imaging effect while meeting the miniaturization design.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used 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 it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an optical lens disclosed in the present application;

fig. 2 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 3 is a schematic structural diagram of an optical lens disclosed in the second embodiment of the present application;

fig. 4 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 6 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 8 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 10 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 12 is a ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 14 is a ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 15 is a schematic structural diagram of the camera module disclosed in the present application;

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

Detailed Description

In the present invention, the terms "first", "second", and the like are mainly used for distinguishing different devices, elements or components (the specific types and configurations may be the same or different), and are not used for indicating or implying relative importance or number of the indicated devices, elements or components. "plurality" means two or more unless otherwise specified.

The technical solution of the present invention will be further described with reference to the following embodiments and the accompanying drawings.

Referring to fig. 1, the present application discloses an optical lens 100, where the optical lens 100 includes a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7, an eighth lens element L8, and a ninth lens element L9, which are disposed in order from an object side to an image side along an optical axis o. During imaging, light rays enter 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 in sequence from the object side surface S1 of the first lens L1, and are finally imaged on the imaging surface 101 of the optical lens 100. The first lens element L1 has positive refractive power, the second lens element L2 and the ninth lens element L9 both 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 all have 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, 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.

The first lens element L1 with positive refractive power is advantageous for shortening the total length of the optical lens and compressing the light direction, thereby reducing the spherical aberration and achieving a higher imaging quality while achieving a compact design of the optical lens 100. By disposing the object-side surface S1 of the first lens element L1 to be convex at the paraxial region o, it is beneficial to enhance the positive refractive power of the first lens element L1 and facilitate the convergence of light rays, so as to further provide a reasonable incident angle of light rays for the introduction of marginal light rays, and thus the optical lens system 100 has a reasonable field angle. By providing the second lens element L2 with negative refractive power and the image-side surface S4 being concave, the light rays converged by the first lens element L1 can be gradually diffused, and the deflection angle of the light rays can be reduced. By disposing the image-side surface S10 of the fifth lens element L5 to be concave at the paraxial region o, the compactness between the lenses is improved, and the processing sensitivity of the image-side surface S10 of the fifth lens element L5 and the risk of stray light are reduced. By arranging the object-side surface S11 of the sixth lens element L6 to be convex at the paraxial region o, the surface shape of the object-side surface S11 of the sixth lens element L6 is restrained, and the object-side surface S11 of the sixth lens element L6 is prevented from being excessively bent, so that the difference between the thickness of the sixth lens element L6 at the paraxial region o and the edge thickness of the sixth lens element L6 is relatively large, which is favorable for reducing the processing sensitivity of the object-side surface S11 of the sixth lens element L6. The object side surfaces of the seventh lens and the L7 eighth lens L8 are both concave surfaces at the circumference, so that stray light is avoided, and the relative illumination of the edges is improved. The image side surface S18 of the ninth lens element L9 is concave at the paraxial region, which is beneficial to correcting distortion, astigmatism and curvature of field, thereby improving the imaging quality, and the image side surface of the ninth lens element L9 is convex at the circumference, so that the incident angle of light on the image surface 101 of the optical lens 100 can be kept in a reasonable range, and the optical lens 100 can be more easily matched with the photosensitive chip of the camera module when being applied to the camera module.

It is considered that the optical lens 100 may be applied to an electronic apparatus such as an in-vehicle device, a driving recorder, or an automobile. When the optical lens 100 is used as a camera on an automobile body, 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 are made of glass, so that the optical lens 100 has a good optical effect and the influence of temperature on the lenses can be reduced. Of course, some lenses of the plurality of lenses of the optical lens 100 may be made of glass, and some lenses may be made of plastic, so that while the effect of reducing temperature on the lenses is ensured to achieve a better imaging effect, the processing cost of the lenses can be reduced, and the weight of the lenses can be reduced, thereby reducing the processing cost of the optical lens 100 and reducing the overall weight of the optical lens 100.

In addition, it is understood that, when the optical lens 100 is applied to an electronic device such as a smart phone or a smart tablet, 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 made of 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 an aspheric surface, and the aspheric surface design can reduce the processing difficulty of the lenses and facilitate control of the surface shapes of the lenses.

In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop or a field stop, 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 understood that, in other embodiments, the diaphragm 102 may also be disposed between two adjacent lenses, for example, between the fourth lens L4 and the fifth lens L5, and the setting position of the diaphragm 102 may be adjusted according to practical situations, which is not specifically limited in this embodiment.

In some embodiments, the optical lens 100 further includes a filter L10, such as an ir cut filter, disposed between the image side S18 of the ninth lens L9 and the image plane 101 of the optical lens 100, so as to filter out infrared light and only allow visible light to pass through, thereby avoiding the problem of distortion of the image caused by 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 between the object side surface of the first lens L1 and 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 diaphragm number of the optical lens 100. Optical lens 100 satisfies above-mentioned relational expression, can rationally restrict optical lens 100's total length, the ratio between effective imaging circle radius and the focus, this optical lens 100 has less total length and great effective imaging circle radius and effective focus, thereby when this optical lens 100 is applied to the module of making a video recording, great effective imaging circle radius can match the great sensitive optical chip of photosensitive area, in order to guarantee that optical lens 100 still has the imaging effect of higher pixel when satisfying the miniaturized design. . When TTL/ImgH/f is greater than or equal to 0.29/mm, the total length of the optical lens 100 is large, which cannot meet the design requirement of miniaturization of the optical lens 100, and the effective imaging circle radius and the effective focal length of the optical lens 100 are small, which makes it difficult to realize large field angle design. When TTL/ImgH/f is less than or equal to 0.21/mm, the total length of the optical lens 100 is small, the effective imaging circle radius and the effective focal length are large, the processing difficulty is large, and the lens is easily distorted in surface shape during processing, which reduces the production yield of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.85 < R31/R32 < 2.2, wherein R31 is the curvature radius of the object side surface S5 of the third lens L3 at the optical axis o, and R32 is the curvature radius of the image side surface S6 of the third lens 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 radii of the object side surface S5 and the image side surface S6 of the third lens L3 are controlled within 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, and 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 equal to or greater than 2.2, the radius of curvature of the object-side surface S5 of the third lens L3 is too large, and the processing sensitivity of the object-side surface S5 of the third lens L3 is large. When R31/R32 is equal to or less than 0.85, the radius of curvature of the image-side surface S6 of the third lens L3 is too large for R32, and the processing sensitivity of the image-side surface S6 of the third lens L3 is large for R32.

In some embodiments, the optical lens 100 satisfies the following relationship: 3.1 < (SD52+ SD62+ SD72)/(CT5+ CT6+ CT7) < 6.8, where SD52 is the maximum effective half-aperture of the image-side surface S10 of the fifth lens L5, SD62 is the maximum effective half-aperture of the image-side surface S12 of the sixth lens L6, SD72 is the maximum effective half-aperture of the image-side surface S14 of the seventh lens L7, CT5 is the thickness of the fifth lens L5 on the optical axis o, that is, the center thickness of the fifth lens L5, CT6 is the thickness of the sixth lens L6 on the optical axis o, that is, the center thickness of the sixth lens L6, and CT7 is the thickness of the seventh lens L7 on the optical axis o, that is, the center thickness of the seventh lens L7. When the optical lens 100 satisfies the above 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 controlled appropriately, so that the thickness settings of the fifth lens L5, the sixth lens L6, and the seventh lens L7 can be ensured appropriately, and the processability of the fifth lens L5, the sixth lens L6, and the seventh lens L7 can be improved. When (SD52+ SD62+ SD72)/(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, and the central 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 flatter, which is not favorable for injection molding, and results in the reduction of the processing precision of the fifth lens L5, the sixth lens L6 and the seventh lens L7. When (SD52+ SD62+ SD72)/(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, and the center thicknesses of the fifth lens L5, the sixth lens L6, and the seventh lens L7 are larger, so that the shape fluctuations of the fifth lens L5, the sixth lens L6, and the seventh lens L7 are larger, and further the processing sensitivities of the fifth lens L5, the sixth lens L6, and the seventh lens L7 are 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 beneficial to reducing the introduction of aberration. In addition, when the first lens L1 and the second lens L2 are aspheric lenses, the first lens L1 and the second lens L2 are favorable for rapidly converging light rays, refracting paraxial light rays at a low deflection angle, reducing introduction of spherical aberration, and being favorable for converging marginal light rays to enter the optical lens 100, so that the optical lens 100 has a reasonable field angle. When f12/f is larger than or equal to 32, the focal power is too concentrated, and light rays enter the first lens L1 and the second lens L2 to shrink rapidly, so that the light rays are too concentrated inside, a region with high processing sensitivity is generated, and 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 small, and deflection is insufficient for large-angle light rays, so that the first lens L1 and the second lens L2 do not bear enough aberration correction amount, and 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 length of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 can be reasonably allocated, which is beneficial to controlling the volume of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6, so as to realize the miniaturized design of the optical lens 100. Meanwhile, 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, and the four lenses are kept to have reasonable focal lengths, so that large-angle incident light rays can be deflected favorably, the light rays can enter the seventh lens L7 gently, the aberration of the edge field can be controlled in a reasonable range favorably, and the imaging quality of the edge field of the optical lens 100 can be improved. When f36/f is greater than or equal to 3.1, the combined focal length ratio of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 is high, and the curvature radius is small, so that the degree of surface curvature of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 is large, and the processing sensitivity of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 is high. When f36/f is less than or equal to 1.6, the focal length ratio of the combination of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 is small, and the optical lens 100 does not have a sufficient refraction effect, which is not favorable for the balanced distribution of aberration.

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, namely, the central thickness of the fourth lens L4. Since the optical lens 100 satisfies 0.14 < (CT4+ CT5+ CT6)/TTL < 0.24, the 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, which is beneficial to realizing the miniaturization of the optical lens 100 and is also convenient to form and assemble the fourth lens L4, the fifth lens L5 and the sixth lens L6. When (CT4+ CT5+ CT6)/TTL is equal to or greater than 0.24, the sum of the center thicknesses of the fourth lens L4, the fifth lens L5 and the sixth lens L6 is large, which makes it difficult to achieve a small overall length of the nine-piece optical lens 100, and is disadvantageous to achieve a compact design of the optical lens 100. When (CT4+ CT5+ CT6)/TTL is less than 0.19, the sum of the central thicknesses of the fourth lens L4, the fifth lens L5 and the sixth lens L6 is small, which causes the lenses to be difficult to process, the structural strength of the lenses to be small, the assembly difficulty to be large, and the production yield of the optical lens 100 to be 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 meets the requirement that CT9/ImgH is more than 0.08 and less than 0.12, the ratio of the central thickness of the ninth lens L9 to the effective imaging circle radius of the optical lens 100 can be reasonably controlled, so that the optical lens 100 has a larger image plane, the central thickness of the ninth lens L9 is reasonable, the processing sensitivity of the ninth lens L9 is reduced, and the problem that the central thickness of the ninth lens L9 is too large and large curvature of field is introduced can be avoided. When CT9/ImgH is less than or equal to 0.08, the central thickness of the ninth lens L9 is small, which seriously affects the molding effect of the ninth lens L9, and the ninth lens L9 is not easy to mold. When CT9/ImgH is equal to or greater than 0.12, the central thickness of the ninth lens element L9 is too large to shorten the total length of the optical lens 100, thereby making it difficult to achieve a compact 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 L7 and the eighth lens L8, R71 is the curvature radius of the object-side surface of the seventh lens L7 at the optical axis o, and R81 is the curvature radius of the object-side surface of the eighth lens L8 at the optical axis o. Because the optical lens 100 satisfies the above relational expression, the combined focal length of the seventh lens L7 and the eighth lens L8, the curvature radius of the seventh lens L7, and the curvature radius of the eighth lens L8 can be reasonably controlled, and 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 type trends, and thus, the optical lens has good deflection effect and aberration correction capability for the light rays of the inner and outer fields of view, so that the aberration of the full field of view is well balanced, and good resolving power can be obtained in the full field of view by matching with the integral nine-piece optical lens 100. If | f78/(R71-R81) | is equal to or greater than 1.3, R71 means that the difference between the radius of curvature of the object-side surface of the seventh lens element L7 and the radius of curvature of the object-side surface of the eighth lens element L8 is small, which is not favorable for the dispersion of refractive power of the seventh lens element L7 and the eighth lens element L8, and is not easy to exert aspheric characteristics to 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 surface S18 of the ninth lens L9 to the image surface 101 of the optical lens 100, i.e., the back focus. When the optical lens 100 satisfies 0.4 < CT9/BF < 0.79, the distance from the ninth lens L9 and the ninth lens L9 to the image plane 101 can be reasonably controlled, which is beneficial to reducing the forming difficulty and the processing surface type error of the ninth lens L9, and is beneficial to controlling distortion, thereby improving the imaging quality of the optical lens 100, and the distance from the ninth lens L9 to the image plane 101 is reasonable, and it can be avoided that the optical lens 100 is applied to a camera module, the ninth lens L9 is too close to a photosensitive chip to affect the assembly and production yield of the camera module, and the matching of the optical lens 100 and different photosensitive chips is beneficial to being improved. When CT9/BF is greater than or equal to 0.79, the center thickness of the ninth lens L9 is thick, which results in the processing sensitivity of the ninth lens L9, the processing difficulty of the ninth lens L9 is large, and it is not favorable to shorten the total length of the optical lens 100, thereby being unfavorable to realize the miniaturization design of the optical lens 100. When the CT9/BF is less than or equal to 0.4, the distance from the ninth lens L9 to the image plane 101 is large, which is not favorable for the miniaturization design of the optical lens 100, and when the optical lens 100 is applied to a camera module, is not favorable for 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, and when the second lens L2 is an aspheric surface, the aberration and chromatic aberration from the center to the edge field can be effectively controlled, which is beneficial to weakening the purple-edge effect of the optical lens 100 and reducing the influence on the imaging purity of the optical lens 100. When Vd2 is larger than or equal to 25, the Abbe number is too large, the refractive index is low, and the position of the second lens L2 is not beneficial to light deflection and chromatic aberration compensation. And when Vd2 is less than or equal to 19.3, the Abbe number is too small, the refractive index is higher, the use cost of the material is suddenly increased, and the high Abbe number is not beneficial to keeping the reasonable thickness of the second lens L2.

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

First embodiment

As shown in fig. 1, the optical lens 100 includes, in order from the object side to the image side along the optical axis o, 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. For 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, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

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

Furthermore, 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 both 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 circumference, 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 circumference. 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 circumference. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are both 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 respectively concave and convex at the circumference. 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 circumference, respectively. 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 circumference. 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 circumference, respectively. The object-side surface S17 and the image-side surface S18 of the ninth lens element L9 are both 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 respectively concave and convex at the circumference.

Specifically, other parameters of the optical lens 100 are given in table 1 below, taking as examples that the effective focal length f of the optical lens 100 is 6.57mm, the aperture size FNO of the optical lens 100 is 1.89, the field angle FOV of the optical lens 100 is 78.67deg, and the total optical length TTL of the optical lens 100 is 8.11 mm. The elements of the optical lens 100 from the object side to the image side along the optical axis o are arranged in the order of the elements from top to bottom in table 1. In the same lens, the surface with the smaller surface number is the object side surface of the lens, and the surface with the larger surface number is the image side surface of the lens, and for example, the surface numbers 1 and 2 correspond to the object side surface S1 and the image side surface S2 of the first lens L1, respectively. The Y radius in table 1 is the radius of curvature of the object-side or image-side surface of the respective surface number at the paraxial region o. The first value in the "thickness" parameter set of a lens is the thickness of the lens on the optical axis o, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis o. The numerical value of the stop 102 in the "thickness" parameter column is the distance from the stop 102 to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis o) on the optical axis o, 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, when the value is negative, it indicates that the stop 102 is disposed on the right side of the vertex of the next surface, and if the thickness of the stop 102 is a positive value, the stop 102 is disposed on the left side of the vertex of the next surface. It is understood that the units of the radius Y, thickness, and focal length in table 1 are all mm. And the reference wavelength of the refractive index, abbe number, focal length of each lens in table 1 was 587 nm.

TABLE 1

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

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

TABLE 2

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

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

Referring to fig. 2 (C), fig. 2 (C) is a distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 587 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. As can be seen from (C) in 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, in order from an object side to an image side along an optical axis o, 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. For 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, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

Further, in the second embodiment, the refractive power of each lens element is the same as that of each lens element in the first embodiment. In addition, the surface shapes of the lenses at the paraxial region o and at the circumference are different from those of the lenses in the first embodiment: 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 of the third lens element L3 is convex at the circumference. 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, respectively.

In the second embodiment, the effective focal length f of the optical lens 100 is 6.19mm, the aperture size FNO of the optical lens 100 is 1.89, the FOV of the field angle of the optical lens 100 is 86.01deg, and the total optical length TTL of the optical lens 100 is 7.98 mm.

Other parameters in the second embodiment are given in the following table 3, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, 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 587 nm.

TABLE 3

In the second embodiment, table 4 gives the high-order term coefficients that can be used for each aspherical surface in the second embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

TABLE 4

Referring to fig. 4, as can be seen from the light spherical aberration diagram (a) in fig. 4, the light astigmatism diagram (B) in fig. 4, and the distortion diagram (C) 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 this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B), and fig. 4 (C), reference may be made to the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C), and details thereof are not repeated herein.

Third embodiment

Referring to fig. 5, the optical lens 100 includes, in order from an object side to an image side along an optical axis o, 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. For 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, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

Further, in the third embodiment, the refractive power of each lens element is different from that of each lens element in the first embodiment in that: the third lens element L3 with negative refractive power and the fifth lens element L5 with positive refractive power. In addition, the surface shapes of the lenses at the paraxial region o and at the circumference are different from those of the lenses in the first embodiment: the object side 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 the paraxial region o. The object-side surface S9 of the fifth lens element L5 is convex at the paraxial region o. The image-side surface S12 of the sixth lens element L6 is concave at the 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 of the optical lens 100 is 5.99mm, the aperture size FNO of the optical lens 100 is 1.87, the field angle FOV of the optical lens 100 is 92.52deg, and the total optical length TTL of the optical lens 100 is 7.97 mm.

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

TABLE 5

In the third embodiment, table 6 gives the high-order term coefficients that can be used for each aspherical surface in the third embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

TABLE 6

Referring to fig. 6, as can be seen from the light spherical aberration diagram (a) in fig. 6, the light astigmatism diagram (B) in fig. 6, and the distortion diagram (C) 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 this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 6 (a), fig. 6 (B), and fig. 6 (C), reference may be made to the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C), and details thereof are not repeated herein.

Fourth embodiment

Referring to fig. 7, the optical lens 100 includes, in order from an object side to an image side along an optical axis o, 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. For 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, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

Further, in the fourth embodiment, the refractive powers of the lens elements are different from the refractive powers of the lens elements in the first embodiment in that the third lens element L3 has negative refractive power and the fifth lens element L5 has positive refractive power. In addition, the surface shapes of the lenses at the paraxial region o and at the circumference are different from those of the lenses in the first embodiment: the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex and concave, respectively, at the paraxial region o, the object-side surface S9 of the fifth lens element L5 is convex, and the image-side surface S10 of the fifth lens element L5 is concave, respectively, at the circumference. 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 image-side surface S14 of the seventh lens element L7 is concave at the circumference. 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 of the optical lens 100 is 5.78mm, the aperture size FNO of the optical lens 100 is 1.87, the field angle FOV of the optical lens 100 is 91.59deg, and the total optical length TTL of the optical lens 100 is 7.60mm, for example.

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

TABLE 7

In the fourth embodiment, table 8 gives the high-order term coefficients that can be used for each aspherical surface in the fourth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

TABLE 8

Referring to fig. 8, as can be seen from the light spherical aberration diagram (a) in fig. 8, the light astigmatism diagram (B) in fig. 8, and the distortion diagram (C) 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 this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 8 (a), fig. 8 (B), and fig. 8 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Fifth embodiment

Referring to fig. 9, the optical lens 100 includes, in order from an object side to an image side along an optical axis o, 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. For 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, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

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. In addition, the surface shapes of the lenses at the paraxial region o and at the circumference are different from those of the lenses in the first embodiment: the object-side surface S5 of the third lens element L3 is circumferentially concave, the object-side surface S7 of the fourth lens element L4 is circumferentially convex near the optical axis o, and the object-side surface S7 of the fourth lens element L4 is circumferentially convex. 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, respectively, at a 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 of the optical lens 100 is 5.58mm, the aperture size FNO of the optical lens 100 is 1.82, the field angle FOV of the optical lens 100 is 93.39deg, and the total optical length TTL of the optical lens 100 is 7.40mm, for example.

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

TABLE 9

In the fifth embodiment, table 10 gives the high-order term coefficients that can be used for each aspherical surface in the fifth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Watch 10

Referring to fig. 10, as can be seen from the light spherical aberration diagram (a) in fig. 10, the light astigmatism diagram (B) in fig. 10, and the distortion diagram (C) 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 this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 10 (a), fig. 10 (B), and fig. 10 (C), reference may be made to the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C), and details thereof are not repeated herein.

Sixth embodiment

Referring to fig. 11, the optical lens 100 includes, in order from an object side to an image side along an optical axis o, 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. For 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, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

Further, the refractive power of each lens element in the sixth embodiment is different from the refractive power of each lens element in 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. In addition, the surface shapes of the lenses at the paraxial region o and at the circumference are different from those of the lenses in the first embodiment: the image-side surface S2 of the first lens element L1 is concave at its 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 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 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 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 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 of the optical lens 100 is 5.38mm, the aperture size FNO of the optical lens 100 is 1.78, the field angle FOV of the optical lens 100 is 84.95deg, and the total optical length TTL of the optical lens 100 is 7.77mm, for example.

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

TABLE 11

In the sixth embodiment, table 12 gives the high-order term coefficients that can be used for each aspherical surface in the sixth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

TABLE 12

Referring to fig. 12, as can be seen from the light spherical aberration diagram (a) in fig. 12, the light astigmatism diagram (B) in fig. 12, and the distortion diagram (C) 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 this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 12 (a), fig. 12 (B), and fig. 12 (C), reference may be made to the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C), and details thereof are not repeated here.

Seventh embodiment

Referring to fig. 13, the optical lens 100 includes, in order from an object side to an image side along an optical axis o, 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. For 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, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

Further, in the seventh embodiment, the refractive powers of the lens elements are different from the refractive powers of the lens elements in 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. In addition, the surface shapes of the lenses at the paraxial region o and at the circumference are different from those of the lenses in the first embodiment:

the object side S1 of the first lens L1 is concave at the circumference. The object side S3 of the second lens L2 is concave at the circumference. The image-side surface S6 of the third lens element 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 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 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 element L9 is convex at the paraxial region o.

In the seventh embodiment, the effective focal length f of the optical lens 100 is 5.76mm, the aperture size FNO of the optical lens 100 is 1.78, the field angle FOV of the optical lens 100 is 86.39deg, and the total optical length TTL of the optical lens 100 is 7.66mm, for example.

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

Watch 13

In the seventh embodiment, table 14 gives the high-order term coefficients that can be used for each aspherical surface in the seventh embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

TABLE 14

Referring to fig. 14, as can be seen from the light spherical aberration diagram (a) in fig. 14, the light astigmatism diagram (B) in fig. 14, and the distortion diagram (C) 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 this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 14 (a), fig. 14 (B), and fig. 14 (C), reference may be made to the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C), and details thereof are not repeated here.

Referring to table 15, table 15 summarizes ratios of the relations in the first embodiment to the seventh embodiment of the present application.

Watch 15

Referring to fig. 15, the present application further discloses a camera module 200, which includes a photo sensor 201 and the optical lens 100 according to any of the first to seventh embodiments, wherein the photo sensor 201 is disposed at an image side of the optical lens 100. The optical lens 100 may be configured to receive a light signal of a subject and project the light signal to the light sensing chip 201, and the light sensing chip 201 may be configured to convert the light signal corresponding to the subject into an image signal. And will not be described in detail herein. It can be understood that the camera module 200 having 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 and a larger effective imaging circle radius and effective focal length, so that a photosensitive chip with a larger photosensitive area can be matched, and the optical lens is ensured to have an imaging effect of a higher pixel while meeting the requirement of miniaturization design. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

Referring to fig. 16, the present application further discloses an electronic device, where the electronic device 300 includes a housing 301 and the camera module 200 as described above, and the camera module 200 is disposed on 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, and the like. It can be understood that the electronic device 300 having the camera 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 and a larger effective imaging circle radius and effective focal length, so that a photosensitive chip with a larger photosensitive area can be matched, and the optical lens can meet the requirement of miniaturization design and also has a higher pixel imaging effect. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

The optical lens, the camera module, the electronic device and the automobile disclosed by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the embodiment of the invention, and the description of the embodiment is only used for helping to understand the optical lens, the camera module, the electronic device and the automobile and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. An optical lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element, and a ninth lens element, which are disposed in this 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 paraxial region;

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

the third lens element with refractive power;

the fourth lens element with 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 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 respective circumferential positions;

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

the optical lens satisfies the following relation:

0.21mm^-1＜TTL/ImgH/f＜0.29mm^-1and FNO < 1.9 < 1.75;

wherein, TTL is a distance from an object side surface of the first lens element to an image plane of the optical lens on the optical axis, ImgH is a radius of an effective imaging circle of the optical lens, f is an effective focal length of the optical lens, and FNO is an f-number of the optical lens.

2. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

0.85＜R31/R32＜2.2；

wherein R31 is a radius of curvature of an object-side surface of the third lens element at the optical axis, and R32 is a radius of curvature of an image-side surface of the third lens element at the optical axis.

3. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

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

wherein SD52 is the maximum effective half aperture of the image-side surface of the fifth lens element, SD62 is the maximum effective half aperture of the image-side surface of the sixth lens element, SD72 is the maximum effective half aperture 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.

4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

1.2＜|f12/f|＜32；

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

5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

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.

6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

0.14＜(CT4+CT5+CT6)/TTL＜0.24；

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

7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

0.08＜CT9/ImgH＜0.12；

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

8. An optical lens according to claim 1, wherein 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.

9. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

0.4＜CT9/BF＜0.79；

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

10. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

19.3<Vd2<25；

wherein Vd2 is the Abbe number of the second lens.

11. A camera module, comprising a photo sensor chip and the optical lens of any one of claims 1-10, wherein the photo sensor chip is disposed on an image side of the optical lens.

12. An electronic device, comprising a housing and the camera module of claim 11, wherein the camera module is disposed in the housing.