CN116466477A

CN116466477A - Image capturing lens

Info

Publication number: CN116466477A
Application number: CN202310481470.3A
Authority: CN
Inventors: 赖圣棠; 张景升; 陈信德; 王国权
Original assignee: Rays Optics Inc
Current assignee: Young Optics Inc
Priority date: 2018-09-26
Filing date: 2018-09-26
Publication date: 2023-07-21
Also published as: CN110955017B; CN110955017A

Abstract

The invention provides an image capturing lens, which comprises a first negative diopter lens, a second negative diopter lens, a third positive diopter lens, a fourth lens and a fifth positive diopter lens which are sequentially arranged from the amplifying side of the image capturing lens to the shrinking side of the image capturing lens. The first lens is a glass crescent lens, the second, third, fourth and fifth lenses are plastic aspheric lenses, two adjacent surfaces of the fourth and fifth lenses are provided with approximately corresponding curved surfaces and are close to each other, the aperture is positioned between the second lens and the fourth lens, and the lens of the image capturing lens with diopter is smaller than 7. L3W is the thickness of the third lens in the optical axis of the image capturing lens, L5W is the thickness of the fifth lens in the optical axis of the image capturing lens, ALW is the sum of the thicknesses of all the lenses in the optical axis of the image capturing lens, and the image capturing lens meets the following conditions: (1) 0.377< l5w/ALW <0.421; and (2) 0.657< (L3W+L5W)/ALW <0.787.

Description

Image capturing lens

The present application is a divisional application of patent application with the application date of 2018, 9, 26, 201811124643.1 and the name of "imaging lens and manufacturing method thereof".

Technical Field

The present invention relates to an imaging lens.

Background

In recent years, along with the progress of technology, the types of lenses are gradually diversified, and a vehicle-mounted lens applied to a vehicle is a common lens. At present, requirements for thinning and optical performance are also increasing, and lenses meeting such requirements are generally required to have characteristics of low cost, high resolution, large aperture, wide viewing angle, low thermal drift amount, light weight and the like. Therefore, there is a need for an imaging lens design that is lightweight and provides low manufacturing cost and good imaging quality.

The background section is only for the purpose of aiding in the understanding of the present invention and thus the disclosure of the background section may include some items that do not form the prior art that are not already known to those of skill in the art. The disclosure in the background section is not section (i.e., is not section) for the purpose of describing any disclosed subject matter or problems associated with one or more embodiments of the present invention that are known or appreciated by those of ordinary skill in the art prior to the application of the present invention.

Disclosure of Invention

According to an aspect of the present invention, there is provided an image capturing lens including a negative refractive power first lens, a second lens, a positive refractive power third lens, a fourth lens, and a positive refractive power fifth lens arranged in order from a magnification side of the image capturing lens to a reduction side of the image capturing lens. The first lens is a glass crescent lens; the second lens, the third lens, the fourth lens and the fifth lens are plastic aspheric lenses; the two adjacent surfaces of the fourth lens and the fifth lens are provided with approximately corresponding curved surfaces and are closely adjacent to each other; the aperture is positioned between the second lens and the fourth lens; the lens of the imaging lens with diopter is smaller than 7 pieces. L3W is the thickness of the third lens in the optical axis of the image capturing lens, L5W is the thickness of the fifth lens in the optical axis of the image capturing lens, ALW is the sum of the thicknesses of all the lenses in the optical axis of the image capturing lens, and the image capturing lens meets the following conditions:

(1) 0.377< L5W/ALW <0.421; and is also provided with

(2) 0.657 <(L3W+L5W)/ALW <0.787。

According to another aspect of the present invention, there is provided an image capturing lens assembly including a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element arranged in order from a first side to a second side of the image capturing lens assembly. The first lens is a negative diopter glass crescent lens, and the first lens is one piece with the largest outer diameter among five lenses; the second lens, the third lens, the fourth lens and the fifth lens are plastic aspheric lenses, and positive diopters are arranged between the third lens and the fifth lens; the adjacent surfaces of the fourth lens and the fifth lens are bonded aspheric surfaces; an aperture is located between the second lens and the fourth lens. L3W is the thickness of the third lens on the optical axis of the image capturing lens, L5W is the thickness of the fifth lens on the optical axis of the image capturing lens, ALW is the sum of the thicknesses of all the lenses of the image capturing lens on the optical axis of the image capturing lens, and the image capturing lens meets the following conditions:

(1) 0.377< L5W/ALW <0.421; and is also provided with

(2) 0.657 <(L3W+L5W)/ALW <0.781。

By means of the design of the embodiment of the invention, the imaging lens design which can enable the optical lens to have the characteristics of good optical imaging quality and light weight, can be applied to the fields of vehicle-mounted, security control, access control and the like, and can provide lower manufacturing cost and better imaging quality can be provided. In addition, the optical lens 5-6 and the distance (TTL) from the lens to the Sensor (Sensor) are smaller than 16.5mm, so that the optical lens design with large aperture, high resolution, light weight, wide viewing angle, low thermal drift and the like can be provided, and the optical lens design with lower manufacturing cost and better imaging quality can be provided.

The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.

Drawings

Fig. 1 is a schematic diagram of an image capturing lens 10a according to an embodiment of the invention.

Fig. 2 to 4 are a field curvature and distortion diagram, a light ray fan diagram, and a relative illuminance diagram of the imaging lens 10a, respectively.

Fig. 5 is a schematic diagram of an image capturing lens 10b according to an embodiment of the invention.

Fig. 6 to 8 are a field curvature and distortion map, a light ray fan-shaped map, and a relative illuminance map of the imaging lens 10b, respectively.

Fig. 9 is a schematic diagram of an image capturing lens 10c according to an embodiment of the invention.

Fig. 10 to 12 are a field curvature and distortion map, a light ray fan map, and a relative illuminance map of the imaging lens 10c, respectively.

Fig. 13 is a schematic diagram of an image capturing lens 10d according to an embodiment of the invention.

Fig. 14 to 16 are a field curvature and distortion map, a light ray fan map, and a relative illuminance map of the imaging lens 10d, respectively.

Detailed Description

The foregoing and other features, aspects and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the attached drawings. Thus, the directional terminology is used for purposes of illustration and is not intended to be limiting of the invention. In addition, the terms "first" and "second" used in the following embodiments are used to identify the same or similar elements, and are not intended to limit the elements.

The optical element according to the present invention is composed of a material which is partially or completely reflective or transmissive, and is usually composed of glass or plastic. Such as a lens, prism or aperture.

When the lens is applied to an image capturing system, the image enlarging side refers to the side on the optical path, which is close to the object to be captured, and the image reducing side refers to the side on the optical path, which is closer to the photosensitive element.

Fig. 1 is a schematic view of a lens structure according to a first embodiment of the present invention. Referring to fig. 1, in the present embodiment, the image capturing lens 10a has a lens barrel (not shown), and the lens barrel includes a first lens L1, a second lens L2, a third lens L3, a stop 14, a fourth lens L4 and a fifth lens L5 arranged from a first side (an image-magnifying side OS) to a second side (an image-demagnifying side IS). The first lens L1, the second lens L2, and the third lens L3 constitute a first lens group (e.g., front group) 20 having positive refractive power, and the fourth lens L4 and the fifth lens L5 constitute a second lens group (e.g., rear group) 30 having positive refractive power. Furthermore, the image reduction side IS may be provided with a filter 16, a glass cover 18 and an image sensor (not shown), the imaging plane of the effective focal length of the visible light of the image capturing lens 10a IS denoted by 19, and the filter 16 and the glass cover 18 are located between the second lens assembly 30 and the imaging plane of the effective focal length of the visible light 19. In the present embodiment, the refractive powers of the first lens element L1 to the fifth lens element L5 are negative, positive, negative and positive, respectively, and the second lens element L3, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are aspheric plastic lens elements. In one embodiment, the aspherical plastic lens may be replaced with an aspherical glass lens. In addition, the two adjacent surfaces of the two lenses have substantially the same (the difference of curvature radius is less than 0.005 mm) or the same (substantially the same) curvature radius and form a cemented lens, a combined lens, a doublet (doublet) or a triplet (triplet), for example, the fourth lens L4 and the fifth lens L5 of the present embodiment form a cemented lens, but the embodiment of the present invention is not limited thereto. The image enlargement side OS of each embodiment of the present invention IS disposed on the left side of each drawing, and the image reduction side IS disposed on the right side of each drawing, respectively, and will not be repeated.

The Aperture 14 is an Aperture Stop (Aperture Stop), and is a separate component or integrated with other optical components. In this embodiment, the aperture is similar to the aperture by blocking the peripheral light and leaving the middle portion transparent, and the mechanism may be adjustable. By adjustable, it is meant that the position, shape or transparency of the machine element is adjusted. Alternatively, the aperture may be coated with an opaque light absorbing material on the surface of the lens, and the light absorbing material may be made to pass through the central portion of the aperture to limit the light path.

The lens design parameters, the shape and the aspherical coefficients of the imaging lens 10a are shown in tables 1 and 2, respectively, and in the design example of the present invention, the aspherical polynomial can be represented by the following formula:

in equation (1), Z is the offset (sag) in the direction of the optical axis 12, and c is the inverse of the radius of a sphere of revolution (osculating sphere), i.e., the inverse of the radius of curvature approaching the optical axis 12 (e.g., the radius of curvature of surfaces S1-S10 in Table 1). k is a conic coefficient (conic), r is an aspheric height, and each of the conic coefficients represents an aspheric polynomial of each order (aspheric coefficient). However, the following description is not intended to limit the invention, and any person skilled in the art, after having referred to the present invention, may make appropriate changes to the parameters or settings thereof, which are still within the scope of the present invention.

TABLE 1

TABLE 2

	S3*	S4*	S5*	S6*	S8*	S9*	S10*
								k	-40.51	-0.80	-5.92	-6.91	81.19	-1.04	-0.16
α1	0	0	0	0	0	0	0
								α2	0	0	0	0	0	0	-1.05E-01
α3	0	0	0	0	0	-4.57E-02	2.77E-02
								α4	4.33E-03	6.88E-02	-9.05E-03	-4.69E-02	2.63E-02	-1.12E-01	-7.94E-03
α5	0	0	0	0	0	-1.05E-02	1.42E-02
								α6	-2.58E-04	-4.37E-02	2.76E-03	2.58E-02	-5.08E-02	1.11E-01	-6.45E-03
α7	0	0	0	0	0	-1.55E-02	-1.24E-03
								α8	2.21E-06	2.39E-02	-4.69E-04	-2.61E-02	2.34E-02	-5.75E-02	1.39E-03
α9	0	0	0	0	0	5.10E-03	1.34E-04
								α10	2.53E-07	-4.12E-03	-8.55E-04	1.15E-02	8.39E-04	1.17E-02	-1.93E-04
α11	0	0	0	0	0	1.12E-02	7.45E-07
								α12	0	0	0	0	0	-5.97E-05	1.16E-06
α13	0	0	0	0	0	7.58E-03	9.45E-08
								α14	0	0	0	0	0	-9.92E-03	2.78E-07

The distance S1 is the distance between the surfaces S1 and S2 on the optical axis 12, the distance S2 is the distance between the surfaces S2 and S3 on the optical axis 12, and the distance S14 is the distance between the surface S14 and the imaging plane 19 on the effective focal length of visible light on the optical axis 12.

The presence of a surface in a table means that the surface is an aspheric surface, and if not labeled, is a sphere.

The radius of curvature refers to the inverse of the curvature. The radius of curvature is positive, and the center of sphere of the lens surface is in the image reduction side direction of the lens. When the radius of curvature is negative, the center of the sphere of the lens surface is in the image magnification side direction of the lens. While the convex-concave of each lens is visible in the table above.

The aperture value of the present invention is represented by F/# as indicated in the above table. When the lens is applied to a projection system, an imaging surface is a light valve surface. When the lens is applied in an imaging system, the imaging surface refers to the surface of the photosensitive element.

In the present invention, the total length of the lens is denoted by LT, as indicated in the above table. More specifically, the total length of the present embodiment refers to the distance between the optical surface S1 closest to the image enlarging side and the optical surface S10 closest to the image reducing side of the image capturing lens 10a measured along the optical axis 12. The total lens Length (LT) of the lens is less than 14.5mm. In the present invention, the total length of the lens to the imaging surface 19 is represented by TTL, as indicated in the above table. More specifically, the total length of the lens to the imaging surface 19 in this embodiment refers to the distance between the optical surface S1 of the imaging lens 10a closest to the image magnification side and the imaging surface 19 of the lens, as measured along the optical axis 12. The first lens of the embodiment is made of glass, and is suitable for a lens which needs to be waterproof and scratch-resistant, such as a vehicle-mounted place, an entrance guard place, an outdoor place and the like.

In the present embodiment, the full field angle FOV refers to the angle of the light receiving of the optical surface S1 closest to the image magnification end, i.e. the field of view (field of view) measured by diagonal line, as indicated in the above table. In the embodiment of the invention, 180 degrees < FOV <220 degrees.

Fig. 2 is a graph of field curvature and distortion of the imaging lens 10a in order from left to right, wherein the horizontal axis of the graph represents the distance from the focal plane and the vertical axis represents the field from 0 to the maximum; the horizontal axis of the distortion plot represents the percent distortion and the vertical axis represents the field from 0 to maximum. Fig. 3 is a graph of a ray fan (ray fan) of the image capturing lens 10a, wherein the horizontal axis represents different positions of the light passing through the aperture stop 14, the vertical axis represents the position of the light impinging on the imaging surface 19, fig. 4 shows the relative illuminance of the image capturing lens 10a, and it can be clearly seen from fig. 2 to fig. 4 that the graphs shown by the analog data graphs are all within the standard range, so that it can be verified that the image capturing lens 10a of the present embodiment can actually have the characteristics of good optical imaging quality.

The lens assembly of an embodiment of the present invention includes two lens groups, and the front lens group may use two negative diopter (Power) lenses, wherein there is an aspheric lens to achieve wide-angle light receiving capability, but the present invention is not limited thereto. The aperture value of the lens is more than or equal to 2.0. In one embodiment, the aperture value of the lens may be 1.8 or more. In one embodiment, the aperture value of the lens may be greater than or equal to 1.5. The rear group comprises a cemented lens (combined lens, doublet) and an aspherical lens to correct aberrations and chromatic aberration, and the minimum distance between the two lenses of the cemented lens along the optical axis is less than 0.05mm. The doublet lens (doublet lens) may be replaced with, for example, a triplet lens (triplet lens) without limitation. The doublet, cemented lens, combined lens, and triplet each comprise corresponding adjacent surfaces having substantially the same or similar radii of curvature. The total number of lenses with diopter is 5-6, and the lens has at least three lenses with Abbe number greater than 50, wherein the cemented lens in the rear group at least comprises one lens with Abbe number greater than 50.

In one embodiment, the third lens dN/dT > -100x 10-6 of the image capturing lens and the fourth lens dN/dT < -120x 10-6 of the image capturing lens have a refractive index difference between the refractive index of light with a wavelength of 587nm passing through the lens when the temperature is 40 degrees and 20 degrees, so that the image capturing lens has a low thermal drift (thermal drift) in a working temperature range of-40 degrees to 85 degrees, and the focal plane offset of visible light is reduced.

In one embodiment, the refractive index of the first lens is greater than 1.55, so as to reduce the optical path turn and increase the Relative Illuminance (RI). The Abbe number of the first lens is larger than 55, thereby suppressing chromatic aberration. The first lens satisfies R1-R2-T <8.8, R1 is the curvature radius of the lens surface S1, R2 is the curvature radius of the lens surface S2, and T is the thickness of the first lens on the optical axis of the lens, so that the manufacturing feasibility and the relative illumination of the first lens can be improved.

In an embodiment, the imaging lens can conform to BFL/TTL less than 0.2 or |f45| less than 0.3, so that the thermal balance of the imaging lens is reduced within a working temperature range of-40 degrees to 85 degrees, wherein BFL is a length from a lens surface S10 to a lens imaging surface S15 on a lens optical axis 12, TTL is a length from a lens surface S1 to a lens imaging surface S15 on a lens optical axis 12, f is an effective focal length of the imaging lens, and f45 is an effective focal length of the cemented lens.

The CRA is an included angle between a principal ray of the imaging lens at a maximum imaging height position incident to the imaging surface and a normal line of the imaging surface at a paraxial region, wherein the normal line of the imaging surface at the paraxial region is parallel to the optical axis. The embodiment of the invention can meet the following conditions: CRA <18 degrees. Therefore, the angle of incidence of the chief ray at the maximum image height on the imaging surface is adjusted, so that proper balance among imaging illumination, imaging quality and lens miniaturization is achieved.

Dist is an optical distortion value (Optical distortion) of the imaging lens imaging height position when the full field angle FOV is 160 degrees, which can satisfy the following condition: dist < -67%. Therefore, the optical distortion of the image capturing lens can be effectively restrained, so that the deformation or distortion of the periphery of a picture can be prevented, and the imaging quality can be optimized.

A design of a second embodiment of the lens barrel of the present invention will be described below. Fig. 5 is a schematic diagram of an architecture of an imaging lens 10b according to a second embodiment of the present invention. The first lens L1 and the second lens L2 constitute a first lens group (e.g., front group) 20 having negative diopter, and the third lens L3, the fourth lens L4, and the fifth lens L5 constitute a second lens group (e.g., rear group) 30 having positive diopter. In the present embodiment, the refractive powers of the first lens element L1 to the fifth lens element L5 of the image capturing lens 10b are negative, positive, negative and positive, respectively, and the second lens element, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are aspheric plastic lens elements. In one embodiment, the aspherical plastic lens may be replaced with an aspherical glass lens. The fourth lens L4 and the fifth lens L5 of the present embodiment form a cemented lens, but the embodiment of the invention is not limited thereto. The lens design parameters, the outer shape and the aspherical coefficients in the imaging lens 10b are shown in tables 3 and 4, respectively.

TABLE 3 Table 3

Table 4 shows the respective order aspherical coefficients and quadric surface coefficient values of the aspherical lens surface of the lens barrel in the second embodiment of the present invention.

TABLE 4 Table 4

S3*

S4*

S6*

S7*

S8*

S9*

S10*

k

-23.40

-1.45

64.59

0.82

44.19

-1.49

0.60

α4

2.11E-02

5.42E-02

-3.07E-02

-1.22E-02

-7.08E-02

2.87E-02

1.91E-02

α6

-5.80E-03

3.72E-03

6.51E-03

1.87E-02

2.98E-02

-1.41E-02

-6.12E-03

α8

8.16E-04

-8.18E-03

-4.55E-02

-5.31E-03

-1.02E-02

6.78E-03

3.56E-03

α10

-6.71E-05

2.49E-03

4.76E-02

9.52E-04

5.06E-04

-2.40E-03

-9.00E-04

α12

3.05E-06

-2.57E-04

-2.25E-02

0

3.28E-04

1.11E-04

α14

-5.90E-08

1.12E-06

0

The distance S1 is the distance between the surfaces S1 and S2 on the optical axis 12, the distance S2 is the distance between the surfaces S2 and S3 on the optical axis 12, and the distance S14 is the distance between the surface S14 and the imaging plane 19 on the effective focal length of visible light on the optical axis 12. The lens has at least three lenses with Abbe numbers greater than 50. The rear lens group is provided with at least one lens with an Abbe number greater than 50.

Fig. 6 is a graph of field curvature and distortion of the imaging lens 10b in order from left to right, wherein the horizontal axis of the graph represents the distance from the focal plane and the vertical axis represents the field from 0 to the maximum; the horizontal axis of the distortion plot represents the percent distortion and the vertical axis represents the field from 0 to maximum. Fig. 7 is a graph of a ray fan (ray fan) of the image capturing lens 10b, wherein the horizontal axis represents different positions of the light passing through the aperture stop 14, the vertical axis represents a position of the light impinging on the imaging surface 19, fig. 8 shows relative illuminance of the image capturing lens 10b, and it can be clearly seen from fig. 6 to fig. 8 that graphs displayed by the analog data graphs are all within a standard range, so that it can be verified that the image capturing lens 10b of the present embodiment can actually have the characteristics of good optical imaging quality.

A design of a third embodiment of the lens barrel of the present invention will be described below. Fig. 9 is a schematic diagram of an architecture of an imaging lens 10c according to a third embodiment of the present invention. The first lens L1 and the second lens L2 constitute a first lens group (e.g., front group) 20 having negative diopter, and the third lens L3, the fourth lens L4, and the fifth lens L5 constitute a second lens group (e.g., rear group) 30 having positive diopter. In the present embodiment, the refractive powers of the first lens element L1 to the fifth lens element L5 of the image capturing lens 10c are negative, positive, negative and positive, respectively, and the second lens element, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are aspheric plastic lens elements. In one embodiment, the aspherical plastic lens may be replaced with an aspherical glass lens. The fourth lens L4 and the fifth lens L5 of the present embodiment form a cemented lens, but the embodiment of the invention is not limited thereto. The lens design parameters, the outer shape and the aspherical coefficients in the imaging lens 10c are shown in tables 5 and 6, respectively.

TABLE 5

Table 6 shows the aspherical coefficients of each order and the quadric coefficient values of the aspherical lens surface of the lens barrel in the third embodiment of the present invention.

TABLE 6

The distance S1 is the distance between the surfaces S1 and S2 on the optical axis 12, the distance S2 is the distance between the surfaces S2 and S3 on the optical axis 12, and the distance S14 is the distance between the surface S14 and the imaging plane 19 on the effective focal length of visible light on the optical axis 12. The front lens group has at least two lenses with Abbe number greater than 50.

Fig. 10 is a graph of field curvature and distortion of the imaging lens 10c in order from left to right, wherein the horizontal axis of the graph represents the distance from the focal plane and the vertical axis represents the field from 0 to the maximum; the horizontal axis of the distortion plot represents the percent distortion and the vertical axis represents the field from 0 to maximum. Fig. 11 is a graph of a ray fan (ray fan) of the image capturing lens 10c, wherein the horizontal axis represents different positions of the light passing through the aperture stop 14, the vertical axis represents the position of the light irradiated to the imaging surface 19, fig. 12 shows the relative illuminance of the image capturing lens 10c, and it can be clearly seen from fig. 10 to fig. 12 that the graphs shown by the analog data graphs are all within the standard range, so that it can be verified that the image capturing lens 10c of the present embodiment can actually have the characteristics of good optical imaging quality.

A design of a fourth embodiment of the lens barrel of the present invention will be described below. Fig. 13 is a schematic diagram of an architecture of an imaging lens 10d according to a fourth embodiment of the present invention. The first lens L1, the second lens L2, and the third lens L3 constitute a first lens group (e.g., front group) 20 having positive refractive power, and the fourth lens L4 and the fifth lens L5 constitute a second lens group (e.g., rear group) 30 having positive refractive power. In the present embodiment, the refractive powers of the first lens element L1 to the fifth lens element L5 of the image capturing lens 10d are negative, positive, negative and positive, respectively, and the second lens element, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are aspheric plastic lens elements. In one embodiment, the aspherical plastic lens may be replaced with an aspherical glass lens. The fourth lens L4 and the fifth lens L5 of the present embodiment form a cemented lens, but the embodiment of the invention is not limited thereto. The lens design parameters, the outer shape and the aspherical coefficients in the imaging lens 10d are shown in tables 7 and 8, respectively.

TABLE 7

Table 8 shows the aspherical coefficients of each order and the quadric coefficient values of the aspherical lens surface of the lens barrel in the fourth embodiment of the present invention.

TABLE 8

Fig. 14 is a graph of curvature of field and distortion of the imaging lens 10d in order from left to right, wherein the horizontal axis of the graph represents the distance from the focal plane and the vertical axis represents the field from 0 to the maximum; the horizontal axis of the distortion plot represents the percent distortion and the vertical axis represents the field from 0 to maximum. Fig. 15 is a graph of a ray fan (ray fan) of the image capturing lens 10d, wherein the horizontal axis represents different positions of the light passing through the aperture stop 14, the vertical axis represents the position of the light impinging on the imaging surface 19, fig. 16 shows the relative illuminance of the image capturing lens 10d, and it can be clearly seen from fig. 14 to fig. 16 that the graphs shown in the simulated data graphs are all within the standard range, so that it can be verified that the image capturing lens 10d of the present embodiment can indeed have the characteristics of good optical imaging quality.

By the design of the embodiment of the invention, the design of the image capturing lens, which can ensure that the optical lens has the characteristics of good optical imaging quality and light weight and can provide lower manufacturing cost and better imaging quality, can be provided. In addition, the optical lens 5-6 and the distance (TTL) from the lens to the Sensor (Sensor) of the embodiment of the invention are smaller than about 16.5mm, so that the optical lens design with large aperture, high resolution, light weight, wide viewing angle, low thermal drift and the like can be provided, and the manufacturing cost and the imaging quality can be reduced.

The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any person skilled in the art can make a few changes or modifications to the equivalent embodiments without departing from the scope of the present invention, but any simple modification, equivalent changes and modifications to the above-mentioned embodiments according to the technical matters of the present invention are still within the scope of the present invention.

Claims

1. An image capturing lens, comprising:

a negative refractive power first lens, a second lens, a positive refractive power third lens, a fourth lens and a positive refractive power fifth lens which are sequentially arranged from a magnification side of the image capturing lens to a reduction side of the image capturing lens;

the first lens is a glass crescent lens;

the second lens, the third lens, the fourth lens and the fifth lens are plastic aspheric lenses;

two adjacent surfaces of the fourth lens and the fifth lens are provided with approximately corresponding curved surfaces and are closely adjacent to each other;

an aperture located between the second lens and the fourth lens;

the lens of the imaging lens with diopter is smaller than 7 pieces;

and L3W is the thickness of the third lens element on the optical axis of the image capturing lens, L5W is the thickness of the fifth lens element on the optical axis of the image capturing lens, ALW is the sum of the thicknesses of all lens elements of the image capturing lens on the optical axis of the image capturing lens, and the image capturing lens satisfies the following conditions:

(1) 0.377< L5W/ALW <0.421; and is also provided with

(2) 0.657 <(L3W+L5W)/ALW <0.787。

2. An image capturing lens, comprising:

the first lens, the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged from the first side to the second side of the image capturing lens;

the first lens is a negative diopter glass crescent lens, and is one lens with the largest outer diameter among the five lenses;

the second lens, the third lens, the fourth lens and the fifth lens are plastic aspheric lenses, and positive diopters are arranged on the third lens and the fifth lens;

the adjacent surfaces of the fourth lens and the fifth lens are bonded aspheric surfaces;

an aperture located between the second lens and the fourth lens;

(1) 0.377< L5W/ALW <0.421; and is also provided with

(2) 0.657 <(L3W+L5W)/ALW <0.781。

3. The imaging lens as claimed in any one of claims 1 to 2, wherein the imaging lens further satisfies the following condition: the aperture value is greater than or equal to 1.5.

4. The imaging lens as claimed in any one of claims 1 to 2, wherein the imaging lens further satisfies the following condition: 180 degrees < full field angle FOV <220 degrees.

5. The imaging lens according to any one of claims 1 to 2, wherein the imaging lens comprises 3 lenses having abbe numbers greater than 50.

6. The imaging lens as claimed in claim 2, wherein the imaging lens further meets the following conditions: the imaging lens comprises the cemented lens between the second side and the aperture, and the difference of the curvature radius of two adjacent surfaces of the cemented lens is less than 0.005mm.

7. The imaging lens according to any one of claims 1 to 2, characterized in that the imaging lens further satisfies the following condition: LT is a length of a lens surface of the first lens, which is farthest from the aperture, to a lens surface of the fifth lens, which is farthest from the aperture, on an optical axis of the imaging lens, and LT is less than 14.5mm.

8. The imaging lens according to any one of claims 1 to 2, characterized in that the imaging lens further satisfies the following condition: TTL is the lens surface of the first lens furthest from the aperture, and the length of the TTL on the optical axis of the imaging lens from the lens surface to the imaging surface of the imaging lens is less than 16.5mm.

9. The imaging lens as claimed in claim 2, wherein the imaging lens further satisfies the following condition: the lens diopters from the first side to the second side are sequentially negative, positive, negative and positive.

10. The imaging lens as claimed in any one of claims 1 to 2, wherein BFL is a length on an optical axis of the imaging lens from a lens surface of the fifth lens furthest from the aperture to the imaging lens surface, TTL is a length on the optical axis of the imaging lens from the lens surface of the first lens furthest from the aperture to the imaging lens surface, f is an effective focal length of the imaging lens, f45 is an effective focal length of the cemented lens, CRA is an angle between a principal ray of the imaging lens at a maximum imaging height position at which the imaging lens is incident on the imaging lens surface and a normal line of the imaging lens imaging surface near the imaging lens optical axis, wherein the normal line is parallel to the optical axis, dist is an optical distortion value at the imaging lens imaging height position when the full field angle FOV is 160 degrees, and the imaging lens satisfies one of: (1) BFL/TTL is less than 0.2, (2) |f/f45| is less than 0.3, (3) CRA <18 degrees, (4) Dist < -67%.