CN112904532B

CN112904532B - Optical lens, camera module and electronic equipment

Info

Publication number: CN112904532B
Application number: CN202110096783.8A
Authority: CN
Inventors: 曾晗; 谭怡翔; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2022-06-24
Anticipated expiration: 2041-01-25
Also published as: CN112904532A

Abstract

An optical lens, a camera module and an electronic device are provided, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged in sequence from an object side to an image side along an optical axis; the first lens has positive focal power, the second lens has negative focal power, the third lens has focal power, the fourth lens has positive focal power, the fifth lens has negative focal power, and the optical lens satisfies the following relational expression: 3.5 < f34/(CT3+ CT4) < 15. According to the optical lens, the camera module and the electronic equipment provided by the embodiment of the invention, when the optical lens meets the relational expression of f34/(CT3+ CT4) < 15 which is more than 3.5, the aberration correction of the front lens group of the optical lens can be effectively realized, and the improvement of the assembly yield of the optical lens is facilitated. In addition, the optical lens is arranged by the surface shape and the refractive power distribution of each lens, so that the miniaturization, the lightness and the thinness of the optical lens can be realized, the structural assembly difficulty of the optical lens is reduced, and the production and the manufacturing cost of the optical lens are favorably controlled.

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 recent years, with the progress of the scientific and technological industry, imaging technology is continuously developed, and optical lenses for optical imaging are widely applied to electronic devices such as smart phones, tablet computers, video cameras and the like. The miniaturization of the optical lens is also challenging in order to meet the design requirements of electronic devices. At present, optical lens is when small-size design, and the equipment of optical lens's structure is the problem of considering first, and this is because, in order to satisfy miniaturized design, the production of optical lens's part, the manufacturing degree of difficulty increase, also lead to its equipment degree of difficulty to increase simultaneously, and then lead to optical lens's whole manufacturing cost higher, are unfavorable for control. Therefore, it is an urgent need to solve the problem of reducing the assembly difficulty between optical lens structures to control the production and save the manufacturing cost while meeting the design requirement of miniaturization of the optical lens.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can meet the miniaturization design of the optical lens, reduce the structural assembly difficulty of the optical lens and effectively control the production and manufacturing cost.

In order to achieve the above object, in a first aspect, the present invention discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in order from an object side to an image side along an optical axis;

the first lens has positive focal power, and the object side surface and the image side surface of the first lens are convex surfaces at a paraxial region;

the second lens has negative focal power, and the image side surface of the second lens is concave at a paraxial region;

the third lens has optical power;

the fourth lens element has a positive optical power, a concave object-side surface at a paraxial region, and a convex image-side surface at a paraxial region;

the fifth lens element has a negative focal power, and has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

the optical lens satisfies the following relation: f34/(CT3+ CT4) < 15 is more than 3.5;

wherein f34 is a combined focal length of the third lens and the fourth lens, CT3 is a thickness of the third lens on the optical axis, and CT4 is a thickness of the fourth lens on the optical axis.

When the optical lens of the embodiment satisfies the above relation, the third lens and the fourth lens of the optical lens can realize reasonable matching of the bending force, so that the aberrations generated by the positive lens and the negative lens can be mutually offset, thereby improving the imaging quality of the optical lens. And the reasonable control of the combined focal length of the third lens and the fourth lens is beneficial to the aberration correction of the front lens group of the optical lens and the improvement of the assembly yield of the optical lens. Meanwhile, the reasonable arrangement of the CT3 and the CT4 can reduce the length of the third lens and the fourth lens on the optical axis, which is beneficial to the miniaturization design of the optical lens and the formation of a gaussian symmetric structure of the optical lens, thereby reducing the generation of optical distortion.

In addition, the focal power and the surface type of the five-piece lens are reasonably configured, so that the optical lens further realizes the miniaturization and light-weight design under the condition of meeting high pixel and high imaging quality, and meanwhile, the structural assembly difficulty of the optical lens is reduced, and the production and manufacturing cost of the optical lens is favorably controlled.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: DL/ImgH is more than 0.9 and less than 1.1;

wherein DL is a distance on the optical axis from the object-side surface of the first lens to the image-side surface of the fifth lens, and ImgH is a half of an image height corresponding to a maximum field angle of the optical lens.

When the relational expression is satisfied, the distance between the lenses is reduced, so that the thickness of the optical lens is reduced, the optical lens is miniaturized, and the optical lens is suitable for being mounted on a light, thin and portable electronic device.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.6 < TTL/(ImgH 2) < 0.7;

wherein TTL is a distance on an optical axis from the object-side surface of the first lens element to an image plane of the optical lens, and ImgH is half of an image height corresponding to a maximum field angle of the optical lens.

Because the size of the electronic photosensitive chip is determined by ImgH, the larger the ImgH is, the larger the size of the electronic photosensitive chip which can be supported by the optical lens is, and especially when the ImgH is larger than or equal to 3mm, the requirements of most electronic equipment (such as a smart phone) on high pixels and high image quality of the optical lens can be met. When TTL (i.e., the total length of the optical lens) is reduced, the overall length of the optical lens may be reduced, so that the overall structure of the optical lens is more compact.

Therefore, in the present embodiment, when the optical lens satisfies the above relation, the imaging quality of the optical lens can be effectively ensured, and the miniaturization design of the optical lens can be realized.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.2 < (CT3+ CT4)/BFL < 2;

and BFL is the shortest distance from the image side surface of the fifth lens to the imaging surface of the optical lens in the direction parallel to the optical axis.

When the relational expression is satisfied, the sufficient matching space between the optical lens and the electronic photosensitive chip can be ensured, and the improvement of the assembly yield of the optical lens is facilitated. Meanwhile, the reasonable arrangement of the CT3 and the CT4 can reduce the length of the third lens and the fourth lens on the optical axis, thereby being beneficial to forming a gaussian symmetric structure of the optical lens and further reducing the generation of optical distortion.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.1 < CT5/(CT12+ CT23+ CT34+ CT45) < 0.7;

wherein CT12 is an air space between the first lens element and the second lens element on the optical axis, CT23 is an air space between the second lens element and the third lens element on the optical axis, CT34 is an air space between the third lens element and the fourth lens element on the optical axis, CT45 is an air space between the fourth lens element and the fifth lens element on the optical axis, and CT5 is a thickness of the fifth lens element on the optical axis.

When the above relational expression is satisfied, the size of the fifth lens and the air space between the lenses can be effectively controlled, and the size error between the lenses can be balanced, so that the assembly of the lenses is facilitated, the assembly difficulty of the optical lens is reduced, and meanwhile, the optical lens can be further miniaturized, and the imaging sensitivity of the optical 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: f12/f is more than 1 and less than or equal to 15;

wherein f12 is a combined focal length of the first lens and the second lens, and f is an effective focal length of the optical lens.

When the above relation is satisfied, the size of the head of the optical lens (i.e. the head of the optical lens is located at the position of the first lens and the second lens) can be reduced by reasonably configuring the refractive powers of the first lens and the second lens, and the deflection angle of the incident light with a large field of view can be reduced, so that the imaging sensitivity of the optical 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< f2/f1< -1;

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

By using the first lens element and the second lens element to provide different refractive powers, the aberrations generated by the positive and negative lens elements can be cancelled out, thereby facilitating the control of the field curvature, astigmatism and spherical aberration of the optical lens. In addition, the first lens element is a biconvex lens, and the image side surface of the second lens element is concave at the paraxial region, so that the design of the surface shapes of the first lens element and the second lens element is helpful to guiding the marginal field rays passing through the first lens element and the second lens element, the emergent angle of the marginal field rays is reduced, and the increase of the imaging sensitivity of the optical lens is avoided.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 18deg/mm < FOV/f < 20 deg/mm;

wherein FOV is a maximum field angle of the optical lens and f is an effective focal length of the optical lens.

By reducing the effective focal length of the optical lens, the optical lens can accommodate more image capturing areas and has certain macro capability. In addition, the refractive power of each lens of the optical lens is reasonably configured, so that the capturing capability of the optical lens on low-frequency details can be improved, and the design requirement of high image quality is met.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 0.1mm^-1＜sin(HFOV)/TTL＜0.2mm^-1；

Wherein, the HFOV is a half of a maximum field angle of the optical lens, and the TTL is a distance on the optical axis from the object-side surface of the first lens to an imaging surface of the optical lens.

When the relational expression is satisfied, the optical lens can satisfy the design requirement of miniaturization, and simultaneously also satisfies the requirement of clear imaging in a large-range scene. When the upper limit of the relational expression is exceeded, the structure of the optical lens is too compact, so that aberration correction becomes difficult, and thus the imaging performance is liable to be degraded. When the lower limit of the relation is lower, the total length of the optical lens is longer, which is not favorable for the miniaturization design of the optical lens.

In a second aspect, the present invention discloses a camera module, which includes an electronic sensor chip and the optical lens of the first aspect, wherein the electronic sensor chip is disposed on an image side of the optical lens.

The camera module with the optical lens meets the requirement of miniaturization design, and meanwhile, the assembly difficulty of the optical lens can be reduced, and the production and manufacturing costs can be effectively controlled.

In a third aspect, the present invention further discloses an electronic device, where the electronic device includes a housing and the camera module according to the second aspect, and the camera module is disposed on the housing. The electronic equipment with the camera module can meet the requirement of miniaturization design, and can also reduce the assembly difficulty of the optical lens and effectively control the production and manufacturing cost.

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

according to the optical lens, the camera module and the electronic device provided by the embodiment of the invention, the optical lens can realize the miniaturization and light and thin design under the condition of meeting the requirements of high pixel and high image quality by reasonably designing the surface shape and the refractive power configuration of each lens, and meanwhile, the structural assembly difficulty of the optical lens can be reduced, and the manufacturing cost of the optical lens can be favorably controlled.

In addition, the optical lens of the present embodiment satisfies the following relation: when f34/(CT3+ CT4) < 15 is more than 3.5, the third lens and the fourth lens of the optical lens can realize reasonable matching of bending force, so that the aberration generated by the positive lens and the negative lens can be mutually offset, and the imaging quality of the optical lens is improved. And the reasonable control of the combined focal length of the third lens and the fourth lens is beneficial to the aberration correction of the front lens group of the optical lens and the improvement of the assembly yield of the optical lens. Meanwhile, the reasonable arrangement of the CT3 and the CT4 can reduce the length of the third lens and the fourth lens on the optical axis, which is beneficial to the miniaturization design of the optical lens and the formation of a gaussian symmetric structure of the optical lens, thereby reducing the generation of optical distortion.

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 an embodiment of the present application;

fig. 2 is a light 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 the 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 the 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 the camera module disclosed in the present application;

fig. 12 is a schematic structural diagram of an electronic device disclosed in the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present invention, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the 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, according to a first aspect of the present application, an optical lens 100 is disclosed, where 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, and an image plane 101 of the optical lens, which are disposed in order from an object side to an image side along an optical axis O. During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 in sequence from the object side of the first lens L1, and is finally imaged on the imaging surface 101 of the optical lens 100. The first lens L1 has positive focal power, the second lens L2 has negative focal power, the third lens L3 has positive focal power or negative focal power, the fourth lens L4 has positive focal power, and the fifth lens L5 has negative focal power.

In some embodiments, in the first through fifth lenses L1 through L5, an object-side surface and an image-side surface of each lens may be concave or convex.

Specifically, the object-side surface 10 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region. The object-side surface 20 of the second lens element L2 can be convex or concave at the paraxial region, and the image-side surface 22 of the second lens element L2 can be concave at the paraxial region. The object-side surface 30 of the third lens element L3 can be concave or convex at the paraxial region, and the image-side surface 32 of the third lens element L3 can be concave or convex at the paraxial region. The object-side surface 40 of the fourth lens element L4 can be concave at the paraxial region, and the image-side surface 42 of the fourth lens element L4 can be convex at the paraxial region. The object-side surface 50 of the fifth lens element L5 can be convex at a paraxial region, and the image-side surface 52 of the fifth lens element L5 can be concave at a paraxial region.

In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 can all be aspheric lenses. The aspheric lens is characterized in that: the curvature of the lens varies continuously from the center of the lens to the periphery of the lens. The aspherical lens has better imaging characteristics and has an advantage of improving aberrations such as distortion and astigmatism, unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens.

In an alternative embodiment, the five lenses of the first lens L1 to the fifth lens L5 may be made of plastic, and the plastic lens can effectively reduce the weight of the optical lens 100 and the production cost thereof.

In another alternative embodiment, the five lenses of the first lens L1 to the fifth lens L5 may be made of glass, and the glass lens has low sensitivity to temperature and can have good optical performance.

It is understood that, in the five lenses, the material of some lenses may be glass, and the material of other lenses may be plastic. The material of the five lenses is not particularly limited in the present embodiment as long as the optical performance requirements can be satisfied.

In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop 102 and/or a field stop 102, which may be disposed on the object side 10 of the first lens L1. With the front diaphragm, a possibility is provided for a large field angle of the optical lens 100. It is understood that, an aperture stop may be disposed at other positions of the optical lens 100, for example, between the first lens L1 and the second lens L2, or between the second lens L2 and the third lens L3, that is, an intermediate aperture stop may also be employed, which is not limited in this embodiment.

Optionally, in order to improve the imaging quality, the optical lens 100 further includes an infrared filter 103, and the infrared filter 103 is disposed between the image-side surface 52 of the fifth lens L5 and the imaging surface 101 of the optical lens 100. By adopting the arrangement of the infrared filter 103, the infrared light passing through the fifth lens L5 can be effectively filtered, so that the imaging definition of the shot object on the imaging surface 101 is ensured, and the imaging quality is improved.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.6 < TTL/(ImgH × 2) < 0.7, where TTL is the distance on the optical axis from the object-side surface 10 of the first lens element L1 to the image plane 101 of the optical lens 100, and ImgH is half the image height corresponding to the maximum field angle of the optical lens 100. Since ImgH determines the size of the electronic sensor, the larger ImgH, the larger the size of the electronic sensor supported by the optical lens 100, especially when ImgH is greater than or equal to 3mm, which can meet the requirement of most electronic devices (e.g. smart phones) on high pixel and high image quality of the optical lens 100. When TTL (i.e., the total length of the optical lens 100) is reduced, the overall length of the optical lens 100 can be reduced, so that the overall structure of the optical lens 100 is more compact. Therefore, when the optical lens 100 satisfies the above relational expression, the miniaturization of the optical lens 100 can be realized while effectively ensuring the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.9 < DL/ImgH <1.1, wherein DL is the distance on the optical axis O from the object-side surface 10 of the first lens L1 to the image-side surface 52 of the fifth lens L5. When the above relational expression is satisfied, it is advantageous to reduce the distance between the lenses, thereby reducing the thickness of the optical lens and realizing miniaturization of the optical lens 100, so that the optical lens is suitable for being mounted on a light, thin, and portable electronic device.

In some embodiments, the optical lens 100 satisfies the following relationship: 3.5 < f34/(CT3+ CT4) < 15, wherein f34 is the combined focal length of the third lens L3 and the fourth lens L4, CT3 is the thickness of the third lens L3 on the optical axis, and CT4 is the thickness of the fourth lens L4 on the optical axis.

When the above-mentioned relational expression is satisfied, the third lens element L3 and the fourth lens element L4 of the optical lens 100 can implement reasonable refractive power matching, so that the aberrations generated by the positive and negative lens elements can be mutually offset, thereby improving the imaging quality of the optical lens. The reasonable control of the combined focal length of the third lens L3 and the fourth lens L4 is beneficial to the aberration correction of the front lens group of the optical lens 100 and the improvement of the assembly yield of the optical lens 100. Meanwhile, the reasonable arrangement of the CT3 and the CT4 can reduce the lengths of the third lens L3 and the fourth lens L4 on the optical axis O, which is beneficial to the miniaturization design of the optical lens, and is also beneficial to the optical lens 100 to form a gaussian symmetric structure, thereby reducing the generation of optical distortion.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.2 < (CT3+ CT4)/BFL < 2, where CT3 is the thickness of the third lens L3 on the optical axis, CT4 is the thickness of the fourth lens L4 on the optical axis, and BFL is the shortest distance from the image-side surface 52 of the fifth lens L5 to the image plane 101 of the optical lens 100 parallel to the optical axis.

When the relational expression is satisfied, a sufficient fitting space between the optical lens 100 and the electronic photosensitive chip can be ensured, which is favorable for improving the assembly yield of the optical lens 100. Meanwhile, the reasonable arrangement of the CT3 and the CT4 can reduce the lengths of the third lens L3 and the fourth lens L4 on the optical axis O, thereby facilitating the optical lens 100 to form a gaussian symmetric structure and further reducing the generation of optical distortion.

In some embodiments, optical lens 100 satisfies the following relationship: 0.1 < CT5/(CT12+ CT23+ CT34+ CT45) < 0.7, wherein CT12 is an air space between the first lens L1 and the second lens L2 on the optical axis, CT23 is an air space between the second lens L2 and the third lens L3 on the optical axis, CT34 is an air space between the third lens L3 and the fourth lens L4 on the optical axis, CT45 is an air space between the fourth lens L4 and the fifth lens L5 on the optical axis, and CT5 is a thickness of the fifth lens L5 on the optical axis.

When the above-mentioned relational expression is satisfied, the size of the fifth lens L5 and the air space between the lenses can be effectively controlled, and the size error between the lenses can be balanced, so that the assembling of the lenses is facilitated, the assembling difficulty of the optical lens 100 is reduced, and the optical lens 100 can be further miniaturized, and the imaging sensitivity of the optical lens 100 is reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: f12/f is more than 1 and less than or equal to 15; where f12 is the combined focal length of the first lens L1 and the second lens L2, and f is the effective focal length of the optical lens 100.

When the above-mentioned relational expression is satisfied, the size of the head of the optical lens 100 (i.e. the position of the first lens element L1 and the second lens element L2 is the head of the optical lens 100) can be reduced by reasonably configuring the refractive powers of the first lens element L1 and the second lens element L2, and the deflection angle of the incident light with a large field of view can be reduced, so that the imaging sensitivity of the optical lens 100 is reduced.

In some embodiments, the optical lens 100 further satisfies the following relationship: -3< f2/f1< -1, wherein f2 is the focal length of the second lens L2 and f1 is the focal length of the first lens L1.

By providing different refractive powers to the first lens element L1 and the second lens element L2, respectively, the aberrations generated by the positive and negative lens elements can cancel each other out, thereby facilitating the control of curvature of field, astigmatism and spherical aberration of the optical lens system 100. In addition, since the first lens element L1 is a biconvex lens, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region, the surface-type design of the first lens element L1 and the second lens element L2 helps to dredge the marginal field rays passing through the first lens element L1 and the second lens element L2, reduce the exit angles of the marginal field rays, and avoid the increase of the imaging sensitivity of the optical lens 100.

In some embodiments, the optical lens 100 further satisfies the following relationship: 18deg/mm < FOV/f < 20 deg/mm; where FOV is the maximum angle of view of optical lens 100 and f is the effective focal length of optical lens 100. By reducing the effective focal length of the optical lens 100, the optical lens 100 can accommodate more image capture areas and has a certain macro capability. In addition, by reasonably configuring the refractive power of each lens element of the optical lens 100, the capturing capability of the optical lens 100 for low-frequency details can be improved, thereby meeting the design requirement of high image quality.

In some embodiments, the optical lens 100 further satisfies the following relationship: 0.1mm^-1＜sin(HFOV)/TTL＜0.2mm^-1(ii) a The HFOV is a half of the maximum field angle of the optical lens 100, and the TTL is a distance on the optical axis O from the object-side surface 10 of the first lens L1 to the image plane 101 of the optical lens 100.

When the above relation is satisfied, the optical lens 100 can satisfy the design requirement of miniaturization, and also satisfy the requirement of clear imaging in a large-range scene. When the upper limit of the relational expression is exceeded, the structure of the optical lens 100 is too compact, so that aberration correction becomes difficult, and thus the imaging performance is liable to be degraded. When the lower limit of the relationship is lower, the total length of the optical lens 100 is longer, which is not favorable for the miniaturization design of the optical lens 100.

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

Example one

A schematic structural diagram of an optical lens 100 disclosed in the first embodiment of the present application is shown in fig. 1, where 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, an infrared filter 103, and an image plane 101, which are sequentially disposed from an object side to an image side along an optical axis O.

Wherein, the focal power distribution of the five-piece lens is shown in the following table 1:

TABLE 1

Lens code	L1	L2	L3	L4	L5
						Power distribution	Is just	Negative pole	Is just for	Is just	Negative pole

Further, the object-side surface 10 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region, the object-side surface 20 of the second lens element L2 is convex at the paraxial region, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region. The object-side surface 30 of the third lens element L3 is convex at the paraxial region, the image-side surface 32 of the third lens element L3 is concave at the paraxial region, the object-side surface 40 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface 42 of the fourth lens element L4 is convex at the paraxial region. The object-side surface 50 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface 52 of the fifth lens element L5 is concave at the paraxial region.

Further, the object-side surface and the image-side surface of the five lenses can be aspheric. The parametric equation for aspheric surfaces may be determined without limitation to the following equation:

wherein X is the point on the aspheric surface which is Y away from the optical axis and the relative distance between the point and the tangent plane tangent to the intersection point on the aspheric surface optical axis; y is the perpendicular distance between the point on the aspheric curve and the optical axis, R is the curvature radius, k is the cone coefficient, and Ai is the aspheric coefficient of the ith order.

Furthermore, the five lenses are made of plastic, so that the overall weight of the optical lens 100 is reduced, and the light and thin design is facilitated.

Specifically, taking as an example that the effective focal length f of the optical lens 100 is 3.81mm, the half field angle HFOV of the optical lens 100 is 35.09deg, the f-number FNO is 2.6, and the total length TTL of the optical lens is 4.71mm, the other parameters of the optical lens 100 are respectively given in table 2 and table 3 below. In table 2, elements from the object side to the image side along the optical axis O of the optical lens 100 are arranged in order from top to bottom. 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 2 and 3 correspond to the object side surface 10 and the image side surface 12 of the first lens L1, respectively.

The Y radius in table 2 is the radius of curvature of the object-side surface or the image-side surface of the corresponding surface number at the optical axis. The first value in the "thickness" parameter column of a lens is the thickness of the lens on the optical axis O (center thickness), and the second value is the distance from the image-side surface of the lens to the back surface on the optical axis O, for example, when the stop 102 is centered (i.e., located between two lenses), the second value is the distance from the image-side surface of the lens to the surface of the stop 102. The numerical value of the stop 102 in the "thickness" parameter column is the distance on the optical axis O 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), the direction from the object-side surface 10 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.

Table 3 is a table of the relevant parameters for the aspheric surface of each lens in Table 2, where k is the cone coefficient and Ai is the i-th order aspheric coefficient. The refractive index, abbe number, and focal length of each lens are numerical values at a reference wavelength (e.g., 587.5618 nm). It is understood that the units of the radius Y, thickness, and focal length in table 2 are all mm.

TABLE 2

TABLE 3

Referring to fig. 2 (a), fig. 2 (a) shows a light spherical aberration curve of the optical lens 100 in the first embodiment at 486.1327nm, 587.5618nm and 656.2725 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 the present embodiment is better.

Referring to fig. 2 (B), fig. 2 (B) is a diagram of astigmatism of light of the optical lens 100 at a wavelength of 587.5618nm according to the first embodiment. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and as can be seen from (B) in fig. 2, 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 587.5618nm according to the first embodiment. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from (C) in fig. 2, the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618 nm.

Example two

Referring to fig. 3, fig. 3 is a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application. 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, an infrared filter 103, and an image plane 101, which are arranged in this order from the object side to the image side along the optical axis O.

Wherein, the focal power distribution of the five-piece lens is shown in the following table 4:

TABLE 4

Further, the object-side surface 10 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region, the object-side surface 20 of the second lens element L2 is concave at the paraxial region, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region. The object-side surface 30 of the third lens element L3 is convex at the paraxial region, the image-side surface 32 of the third lens element L3 is concave at the paraxial region, the object-side surface 40 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface 42 of the fourth lens element L4 is convex at the paraxial region. The object-side surface 50 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface 52 of the fifth lens element L5 is concave at the paraxial region.

Other parameters in the second embodiment are shown in the following table 5 and table 6, 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 5 are mm.

TABLE 5

TABLE 6

Further, referring to fig. 4 (a), a light spherical aberration curve chart of the optical lens 100 of the second embodiment at wavelengths of 486.1327nm, 587.5618nm, and 656.2725nm is shown. In fig. 4 (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. 4 (a), the spherical aberration value of the optical lens 100 in the second embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 4 (B), fig. 4 (B) is a diagram of astigmatism of light of the optical lens 100 at a wavelength of 587.5618nm according to the second embodiment. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and as can be seen from (B) in fig. 4, astigmatism of the optical lens 100 is well compensated.

Referring to fig. 4 (C), fig. 4 (C) is a distortion curve diagram of the optical lens 100 of the second embodiment at a wavelength of 587.5618 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from (C) in fig. 4, the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618 nm.

EXAMPLE III

Referring to fig. 5, fig. 5 is a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application. 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, an infrared filter 103, and an image plane 101, which are arranged in this order from the object side to the image side along the optical axis O.

Wherein, the power distribution of the five-piece lens is shown in the following table 7:

TABLE 7

Lens code	L1	L2	L3	L4	L5
						Power distribution	Is just	Negative pole	Negative pole	Is just	Negative pole

Further, the object-side surface 10 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region, the object-side surface 20 of the second lens element L2 is concave at the paraxial region, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region. The object-side surface 30 of the third lens element L3 is concave at the paraxial region, the image-side surface 32 of the third lens element L3 is concave at the paraxial region, the object-side surface 40 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface 42 of the fourth lens element L4 is convex at the paraxial region. The object-side surface 50 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface 52 of the fifth lens element L5 is concave at the paraxial region.

Other parameters in the third embodiment are shown in the following table 8 and 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 8 are mm.

TABLE 8

TABLE 9

Further, referring to fig. 6 (a), a light spherical aberration curve chart of the optical lens 100 in the third embodiment at wavelengths of 486.1327nm, 587.5618nm, and 656.2725nm is shown. In fig. 6 (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. 6 (a), the spherical aberration value of the optical lens 100 in the third embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 6 (B), fig. 6 (B) is a diagram of astigmatism of light of the optical lens 100 of the third embodiment at a wavelength of 587.5618 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and as can be seen from (B) in fig. 6, astigmatism of the optical lens 100 is well compensated.

Referring to fig. 6 (C), fig. 6 (C) is a distortion curve diagram of the optical lens 100 of the third embodiment at a wavelength of 587.5618 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from (C) in fig. 6, the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618 nm.

Example four

Fig. 7 is a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present disclosure. 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, an infrared filter 103, and an image plane 101, which are provided in this order from the object side to the image side along the optical axis O.

Wherein, the power distribution of the five-piece lens is shown in the following table 10:

watch 10

Lens code	L1	L2	L3	L4	L5
						Power distribution	Is just	Negative pole	Is just	Is just	Negative pole

Further, the object-side surface 10 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region, the object-side surface 20 of the second lens element L2 is concave at the paraxial region, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region. The object-side surface 30 of the third lens element L3 is concave at the paraxial region, the image-side surface 32 of the third lens element L3 is convex at the paraxial region, the object-side surface 40 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface 42 of the fourth lens element L4 is convex at the paraxial region. The object-side surface 50 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface 52 of the fifth lens element L5 is concave at the paraxial region.

The other parameters in the fourth embodiment are shown in the following table 11 and table 12, 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.

TABLE 11

TABLE 12

Further, please refer to (a) in fig. 8, which shows a light spherical aberration curve diagram of the optical lens 100 of the fourth embodiment at 486.1327nm, 587.5618nm, and 656.2725 nm. In fig. 8 (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 (a) in fig. 8, the spherical aberration value of the optical lens 100 in the fourth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 8 (B), fig. 8 (B) is a diagram of astigmatism of light of the optical lens 100 at a wavelength of 587.5618nm according to the fourth embodiment. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and as can be seen from (B) in fig. 8, astigmatism of the optical lens 100 is well compensated.

Referring to fig. 8 (C), fig. 8 (C) is a distortion curve diagram of the optical lens 100 of the fourth embodiment at a wavelength of 587.5618 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from (C) in fig. 8, the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618 nm.

EXAMPLE five

Fig. 9 is a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present disclosure. 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, an infrared filter 103, and an image plane 101, which are arranged in this order from the object side to the image side along the optical axis O.

Wherein, the power distribution of the five-piece lens is shown in the following table 13:

watch 13

The other parameters in the fifth embodiment are shown in the following table 14 and table 15, 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 14 are mm.

TABLE 14

Watch 15

Further, referring to fig. 10 (a), a light spherical aberration curve chart of the optical lens 100 of the fifth embodiment at the wavelengths of 486.1327nm, 587.5618nm, and 656.2725nm is shown. In fig. 10 (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. 10 (a), the spherical aberration value of the optical lens 100 in the fifth embodiment is better, which indicates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 10 (B), fig. 10 (B) is a diagram of astigmatism of light of the optical lens 100 of the fifth embodiment at a wavelength of 587.5618 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. 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. 10 that the astigmatism of the optical lens 100 is well compensated.

Referring to fig. 10 (C), fig. 10 (C) is a distortion curve diagram of the optical lens 100 of the fifth embodiment at a wavelength of 587.5618 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from (C) in fig. 10, the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618 nm.

Please refer to table 16, where table 16 is a summary table of values that each relation satisfies in the first to fifth embodiments of the present application.

TABLE 16

Referring to fig. 11, the present application further discloses a camera module 200, which includes an electronic sensor 201 and the optical lens 100 according to any of the first to fifth embodiments, wherein the electronic sensor 201 is disposed at an image side of the optical lens 100. The optical lens 100 is configured to receive a light signal of a subject and project the light signal to the electronic photosensitive chip 201, and the electronic photosensitive chip 201 is configured to convert the light signal corresponding to the subject into an image signal. It can be understood that the image capturing module 200 having the optical lens 100 has all the technical effects of the optical lens 100, i.e. the miniaturization of the design is satisfied, and at the same time, the difficulty of assembling the optical lens 100 is reduced, and the production and manufacturing costs are effectively controlled.

Referring to fig. 12, the present application further discloses an electronic device 300, wherein the electronic device 300 includes a housing 301 and the camera module 200, and the camera module 200 is disposed on the housing 301. 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, while satisfying the miniaturization design, it is possible to reduce the difficulty of assembling the optical lens 100 and to effectively control the production and manufacturing costs.

In addition, it can be understood that, when the camera module 200 is applied to an electronic device 300, such as a mobile phone, a tablet computer, and a smart watch, it can be used as a rear camera of the electronic device 300, for example, as shown in fig. 12. Of course, the camera module 200 can also be used as a front camera of the electronic device 300, and can be specifically configured according to actual situations, which is not specifically limited in this embodiment.

The optical lens, the camera module and the electronic device disclosed in the embodiments of the present invention are described in detail above, and the principle and the embodiments of the present invention are explained in detail herein by applying specific examples, and the description of the embodiments above is only used to help understanding the optical lens, the camera module and the electronic device and the core ideas thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, 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, characterized in that: the optical lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged in sequence from an object side to an image side along an optical axis;

the third lens has optical power;

the optical lens satisfies the following relation: f34/(CT3+ CT4) < 15 is more than 3.5; 18deg/mm < FOV/f < 20 deg/mm;

wherein f34 is a combined focal length of the third lens element and the fourth lens element, CT3 is a thickness of the third lens element on the optical axis, CT4 is a thickness of the fourth lens element on the optical axis, FOV is a maximum field angle of the optical lens, and f is an effective focal length of the optical lens;

the optical lens is provided with five lenses with refractive power.

2. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

0.9＜DL/ImgH＜1.1；

3. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

0.6＜TTL/(ImgH*2)＜0.7；

wherein TTL is a distance on the optical axis from the object-side surface of the first lens element to an image plane of the optical lens, and ImgH is half of an image height corresponding to a maximum field angle of the optical lens.

4. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

1.2＜(CT3+CT4)/BFL＜2；

5. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

0.1＜CT5/(CT12+CT23+CT34+CT45)＜0.7；

6. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

1＜f12/f≤15；

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

7. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

-3＜f2/f1＜-1；

8. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

0.1mm^-1＜sin(HFOV)/TTL＜0.2mm^-1；

9. The utility model provides a module of making a video recording which characterized in that: the image pickup module comprises an electronic photosensitive chip and the optical lens according to any one of claims 1 to 8, wherein the electronic photosensitive chip is arranged on the image side of the optical lens.

10. An electronic device, characterized in that: the electronic device comprises a housing and the camera module of claim 9, the camera module being disposed on the housing.