CN110727089B

CN110727089B - Optical lens

Info

Publication number: CN110727089B
Application number: CN201810775296.2A
Authority: CN
Inventors: 张恩鑫; 郎海涛; 樊坚; 朱旭彪
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2018-07-16
Filing date: 2018-07-16
Publication date: 2021-10-22
Anticipated expiration: 2038-07-16
Also published as: CN110727089A

Abstract

The application discloses optical lens, this optical lens can include along the optical axis from the formation of image side to image source side in proper order: the lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens can have negative focal power, the imaging side surface of the first lens is a convex surface, and the image source side surface of the first lens is a concave surface; the second lens can have positive focal power, the imaging side surface of the second lens is a concave surface, and the image source side surface of the second lens is a convex surface; the third lens can have positive focal power, the imaging side surface of the third lens is a concave surface, and the image source side surface of the third lens is a convex surface; the fourth lens may have a negative optical power; the fifth lens can have positive focal power, and the imaging side surface and the image source side surface of the fifth lens are convex surfaces; and the fourth lens and the fifth lens can be mutually glued to form a cemented lens. According to the optical lens of the present application, at least one of effects such as miniaturization, large light flux, high resolution, small diameter at the tip, and high relative illuminance can be achieved.

Description

Optical lens

Technical Field

The present application relates to an optical lens, and more particularly, to an optical lens including five lenses.

Background

In recent years, with the continuous progress of image technology, the application range of optical lenses is becoming wider. For example, in an optical lens, in order to obtain a high-brightness image, the light-passing capability of the lens needs to be strong enough, the F-number design requirement of the lens is smaller, and the resolution of the lens is also ensured.

In addition, in order to meet the demand for miniaturization of electronic devices, optical imaging devices are increasingly miniaturized, so the optical lens is not too large, and miniaturization of the optical lens is important.

Accordingly, the present application provides an optical lens that is miniaturized, has a large amount of light flux, and has high resolution.

Disclosure of Invention

The present application provides an optical lens that may overcome at least or partially overcome at least one of the above-mentioned deficiencies in the prior art.

An aspect of the present application provides an optical lens that may include, in order from an image side to an image source side along an optical axis: the lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens can have negative focal power, the imaging side surface of the first lens is a convex surface, and the image source side surface of the first lens is a concave surface; the second lens can have positive focal power, the imaging side surface of the second lens is a concave surface, and the image source side surface of the second lens is a convex surface; the third lens can have positive focal power, the imaging side surface of the third lens is a concave surface, and the image source side surface of the third lens is a convex surface; the fourth lens may have a negative optical power; the fifth lens can have positive focal power, and the imaging side surface and the image source side surface of the fifth lens are convex surfaces; and the fourth lens and the fifth lens can be mutually glued to form a cemented lens.

In one embodiment, the image-side surface of the fourth lens may be convex and the image-source-side surface may be concave.

In another embodiment, both the image-side surface and the image-source-side surface of the fourth lens may be concave.

In one embodiment, the first lens and the second lens may each be aspheric lenses.

In one embodiment, the optical lens may further include a stop disposed between the second lens and the third lens.

In one embodiment, the radius of curvature R1 of the image-side surface of the first lens, the radius of curvature R2 of the image-source-side surface of the first lens, and the center thickness d1 of the first lens may satisfy: R1/(R2+ d1) is more than or equal to 0.8 and less than or equal to 1.8.

In one embodiment, the radius of curvature R3 of the image-side surface of the second lens, the radius of curvature R4 of the image-source-side surface of the second lens, and the center thickness d3 of the second lens may satisfy: R3/(R4+ d3) is more than or equal to 2 and less than or equal to 6.

In one embodiment, a radius of curvature R6 of the image-side surface of the third lens and a radius of curvature R7 of the image-source-side surface of the third lens may satisfy: R6/R7 is more than or equal to 3.5 and less than or equal to 6.

In one embodiment, a radius of curvature R9 of the image-side surface of the fifth lens and a radius of curvature R10 of the image-source-side surface of the fifth lens may satisfy: R9/R10 is not less than-0.8 and not more than-0.2.

In one embodiment, the focal length value F4 of the fourth lens and the focal length value F5 of the fifth lens satisfy: the ratio of F5 to F4 is less than or equal to 1.1.

In one embodiment, the focal length value F5 of the fifth lens and the focal length value F of the whole group of the optical lens satisfy: F5/F is less than or equal to 1.4.

In one embodiment, the total optical length TTL of the optical lens and the entire group focal length F of the optical lens may satisfy: TTL/F is less than or equal to 4.5.

Another aspect of the present application provides an optical lens that may include, in order from an image side to an image source side along an optical axis: the lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. Wherein the first lens and the fourth lens can both have negative focal power; the second lens, the third lens and the fifth lens may each have a positive focal power; wherein, the total optical length TTL of the optical lens and the whole group of focal length values F of the optical lens can satisfy the following conditions: TTL/F is less than or equal to 4.5; and a radius of curvature R6 of the image-side surface of the third lens and a radius of curvature R7 of the image-source-side surface of the third lens may satisfy: R6/R7 is more than or equal to 3.5 and less than or equal to 6.

In one embodiment, the image-side surface of the first lens may be convex and the image-source-side surface may be concave.

In one embodiment, the image-side surface of the second lens can be concave and the image-source-side surface can be convex.

In one embodiment, the image-side surface of the third lens may be concave and the image-source-side surface may be convex.

In one embodiment, both the image-side surface and the image-source-side surface of the fifth lens may be convex.

In one embodiment, the fourth lens and the fifth lens may be cemented with each other to form a cemented lens.

The optical lens adopts five lenses, for example, the shapes of the lenses are optimally set, the focal power of each lens is reasonably distributed, the cemented lens is formed, and the like, so that at least one of the beneficial effects of miniaturization, large light flux, high resolution, small front end aperture, high relative illumination and the like of the optical lens can be realized.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 is a schematic view showing a structure of an optical lens according to embodiment 1 of the present application;

fig. 2 is a schematic structural view showing an optical lens according to embodiment 2 of the present application; and

fig. 3 is a schematic view showing a structure of an optical lens according to embodiment 3 of the present application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens, and the first cemented lens may also be referred to as the second cemented lens, without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. It is to be understood that a surface near the image source side in each lens is referred to as an image source side surface, and a surface near the image forming side in each lens is referred to as an image forming side surface.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles, and other aspects of the present application are described in detail below.

An optical lens according to an exemplary embodiment of the present application includes, for example, five lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are arranged in order from the imaging side to the image source side along the optical axis.

The first lens can have negative power, and the imaging side surface of the first lens can be convex and the image source side surface of the first lens can be concave. The first lens is arranged in a meniscus shape protruding towards the imaging side, so that light rays can be dispersed, the range of the imaging surface is enlarged, and the imaging angle/projection angle as large as possible is ensured.

The second lens can have positive optical power, and the imaging side surface of the second lens can be concave and the image source side surface of the second lens can be convex. The second lens is arranged in a meniscus shape protruding towards the image source side, and the compressed light can be smoothly transited to the first lens.

The third lens element may have a positive optical power, and the image-side surface thereof may be concave and the image-source-side surface thereof may be convex. The third lens is arranged in a meniscus shape protruding towards the image source side, and can shrink light rays, so that the front port diameter of the system is small enough.

The fourth lens can have a negative power, and the image-side surface can optionally be convex or concave, and the image-source-side surface can be concave.

The fifth lens may have a positive power, and both the image-side surface and the image-source-side surface thereof may be convex.

As known to those skilled in the art, cemented lenses may be used to minimize or eliminate chromatic aberration. The use of the cemented lens in the optical lens can improve the image quality and reduce the reflection loss of light energy, thereby improving the imaging definition of the lens. In addition, the use of the cemented lens can also simplify the assembly process in the lens manufacturing process.

In an exemplary embodiment, the fourth lens and the fifth lens may be combined into a cemented lens by cementing an image source-side surface of the fourth lens with an image-side surface of the fifth lens. By introducing the cemented lens consisting of the fourth lens and the fifth lens, the chromatic aberration influence can be eliminated, and the tolerance sensitivity is reduced; meanwhile, the cemented lens may also retain a part of chromatic aberration to balance the entire chromatic aberration of the optical system. The air space between the two lenses is omitted by gluing the lenses, so that the optical system is compact as a whole, and the requirement of system miniaturization is met. Furthermore, the gluing of the lenses reduces tolerance sensitivity problems of the lens units due to tilt/decentration during assembly.

In the cemented lens, the fourth lens near the image side has negative power, and the fifth lens near the image source side has positive power, which makes it possible to receive the light reflected on the DMD chip into the system as much as possible.

In an exemplary embodiment, the optical lens may further include at least one stop to improve the imaging quality of the lens. Optionally, a diaphragm may be disposed between the second lens and the third lens to shrink the light and reduce the aperture of the front end of the system. It should be understood that the diaphragm can be disposed in any position of the lens as required, according to the application/requirement, without being limited by the above-mentioned position.

In an exemplary embodiment, the optical lens may further include another prism/field lens disposed after the fifth lens, wherein the prism may be used to transition the illumination end and the imaging end of the optical lens; the field lens can correct aberration and improve the capability of marginal beam incidence.

In an exemplary embodiment, the optical lens may further include a protective lens disposed between the fifth lens and the image source, as needed, to prevent a chip of the lens and/or internal elements of the lens from being damaged.

In an exemplary embodiment, the radius of curvature R1 of the imaging-side surface of the first lens, the radius of curvature R2 of the image-source-side surface of the first lens, and the center thickness d1 of the first lens may satisfy: R1/(R2+ d1) is 0.8 or more and 1.8 or less, and preferably 1 or more R1/(R2+ d1) or less and 1.6 or less. Through the special shape design of the approximate concentric circles of the first lens, the system aberration can be favorably reduced, and the resolution quality is improved.

In an exemplary embodiment, the radius of curvature R3 of the imaging-side surface of the second lens, the radius of curvature R4 of the image-source-side surface of the second lens, and the center thickness d3 of the second lens may satisfy: R3/(R4+ d3) is not less than 2 and not more than 6, and ideally, R3/(R4+ d3) is not more than 2.5 and not more than 5.5. Through the special shape design of the second lens, the system aberration can be favorably reduced, and the resolution quality is improved.

In an exemplary embodiment, a radius of curvature R6 of an image-side surface of the third lens and a radius of curvature R7 of an image-source-side surface of the third lens may satisfy: R6/R7 is 3.5. ltoreq.6, and preferably 3.7. ltoreq.R 6/R7. ltoreq.5.8. By satisfying the conditional expression of 3.5-6R 6/R7, the front end caliber of the system can be reduced.

In an exemplary embodiment, a radius of curvature R9 of the image-side surface of the fifth lens and a radius of curvature R10 of the image-source-side surface of the fifth lens may satisfy: R9/R10 of-0.8. ltoreq. and desirably-0.7. ltoreq. R9/R10 of-0.35. By the special shape design that the curvature radius of the imaging side surface and the curvature radius of the image source side surface of the fifth lens are close to each other, the light rays can be collected as much as possible.

In an exemplary embodiment, a focal length value F4 of the fourth lens and a focal length value F5 of the fifth lens may satisfy: the | F5/F4| is less than or equal to 1.1, and ideally, the | F5/F4| is less than or equal to 1. Through reasonable distribution of focal power of the fourth lens and the fifth lens, focal lengths of the fourth lens and the fifth lens are close to each other, and light can smoothly transit to an imaging surface.

In an exemplary embodiment, a focal length value F5 of the fifth lens and a focal length value F of the entire group of the optical lens may satisfy: F5/F is not more than 1.4, and desirably, F5/F is not more than 1.2. Through the reasonable distribution to the focal power of fifth lens, can be favorable to collecting light, guarantee the light flux, promote relative illuminance.

In an exemplary embodiment, an optical total length TTL of the optical lens and a whole set of focal length values F of the optical lens may satisfy: TTL/F is less than or equal to 4.5, ideally, TTL and F can further satisfy TTL/F is less than or equal to 4. The condition TTL/F is less than or equal to 4.5, and the miniaturization characteristic of the lens can be realized.

In an exemplary embodiment, an optical lens according to the present application may employ an aspherical lens. The aspheric lens has the characteristics that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the lens center to the lens periphery, an aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, so that the imaging quality of the lens is improved. For example, the first lens can adopt an aspheric lens to correct the off-axis point aberration of the system, optimize the optical performance such as distortion and CRA, and improve the imaging quality. For example, the second lens may be an aspheric lens to correct the off-axis point aberration and improve the imaging quality. Ideally, the first lens and the second lens are both aspheric lenses.

In an exemplary embodiment, the lens used in the optical lens may be a plastic lens, or may be a glass lens. The lens made of plastic has a large thermal expansion coefficient, and when the ambient temperature change of the lens is large, the lens made of plastic causes a large amount of change of the optical back focus of the lens. The glass lens can reduce the influence of temperature on the optical back focus of the lens, but has higher cost.

According to the optical lens of the embodiment of the application, the lens shape is optimally set, the lens is arranged, the focal power is reasonably distributed, and the materials of the lenses are reasonably matched, so that the TTL can be shortened, and the miniaturization of the lens is ensured; in addition, the special shape arrangement of the first lens and the second lens is beneficial to realizing excellent resolving power; through the design of the meniscus shape of the third lens, the light receiving capacity can be enhanced, and the small caliber of the front end can be ensured; and the short focal length of the fifth lens is set, so that the light receiving range can be ensured, the light transmission amount is ensured, and the relative illumination is improved. Therefore, the optical lens according to the above embodiments may have excellent imaging effect/projection quality, and may have a wide application prospect, for example, may be applied to the field of smart projection headlamps as a projection lens, and may provide a good appearance in a limited space because of the projection lens having a smaller front end aperture and the convex first surface at the image source side. It should be understood that the projection lens is only an example of the application of the optical lens according to the above-described embodiment of the present application, and is not to be construed as a limitation, and the optical lens may also be applied to other fields as needed.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the optical lens is not limited to include five lenses. The optical lens may also include other numbers of lenses, if desired.

Specific examples of an optical lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical lens according to embodiment 1 of the present application is described below with reference to fig. 1. Fig. 1 shows a schematic structural diagram of an optical lens according to embodiment 1 of the present application.

As shown in fig. 1, the optical lens includes, in order from the imaging side to the image source side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5.

The first lens L1 is a meniscus lens with negative power, and has a convex image-side surface S1 and a concave image-source-side surface S2.

The second lens L2 is a meniscus lens with positive power, and has a concave image-side surface S3 and a convex image-source-side surface S4.

The third lens L3 is a meniscus lens having positive power, and has a concave image-side surface S6 and a convex image-source-side surface S7.

The fourth lens L4 is a meniscus lens having a negative refractive power, and has a convex image-side surface S8 and a concave image-source-side surface S9. The fifth lens L5 is a double-convex lens having positive optical power, and both the image-side surface S9 and the image-source-side surface S10 thereof are convex. Wherein, the fourth lens L4 and the fifth lens L5 are cemented with each other to form a cemented lens.

The first lens L1 and the second lens L2 are both aspheric lenses, and both of the imaging side surface and the image source side surface of each lens are aspheric.

In the present embodiment, a stop disposed between the second lens L2 and the third lens L3 may be further included in the optical lens to improve the imaging quality.

The optical lens may further include a protective lens L6 disposed between the fifth lens L5 and the image source S13, the protective lens L6 having an imaging side surface S11 and an image source side surface S12 to protect internal elements of the projection chip and/or the lens. In projection, light from the image source S13 passes through the surfaces S12-S1 in sequence and is ultimately projected onto a target object (not shown) in space.

Table 1 shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 1, where the radius of curvature R and the thickness T are both in units of millimeters (mm).

TABLE 1

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	26.7130	7.4960	1.59	61.20
2	16.4580	21.0132
					3	-42.5610	18.8856	1.59	61.20
4	-28.4100	-5.0600
					STO	All-round	21.0600
6	-268.4500	17.3600	1.69	54.60
					7	-50.7650	0.8430
8	814.2400	3.2234	1.85	23.80
					9	43.6750	23.5400	1.75	52.30
10	-84.1240	40.0000
					11	All-round	1.1000	1.51	62.90
12	All-round	0.5100
					IMA	All-round

The present embodiment adopts five lenses as an example, and by reasonably distributing the focal power and the surface type of each lens, the lens can have at least one of the advantages of miniaturization, large light flux, high resolution, small front end aperture, high relative illumination and the like. Each aspherical surface type Z is defined by the following formula:

wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient conc; A. b, C, D, E are all high order term coefficients. Table 2 below shows the conic coefficients k and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S1-S4 in example 1.

TABLE 2

Flour mark

K

A

B

C

D

E

1

-0.9950

-4.2720E-06

-2.1053E-08

5.6997E-12

5.5605E-14

-5.3552E-17

2

-0.6966

-7.4082E-06

-6.2506E-08

4.9636E-11

1.0339E-13

-1.7181E-16

3

2.4048

-8.4721E-06

2.5547E-08

-1.3676E-10

2.3594E-13

-1.2696E-17

4

-0.7590

-1.4093E-06

-3.4908E-09

1.2728E-11

-3.0829E-14

3.6662E-17

Table 3 below gives the entire set of focal length values F, the total optical length TTL (i.e., the on-axis distance from the center of the imaging side surface S1 of the first lens L1 to the image source side surface IMA), the radii of curvature R1 and R2 of the imaging side surface S1 and the image source side surface S2 of the first lens L1, d1 of the center thickness of the first lens L1, the radii of curvature R3 and R4 of the imaging side surface S3 and the image source side surface S4 of the second lens L2, d3 of the center thickness of the second lens L2, the radii of curvature R6 and R7 of the imaging side surface S6 and the image source side surface S7 of the third lens L3, the value of focal length F4 of the fourth lens L4, the value F5 of the focal length value F5 of the fifth lens L5, and the radii of curvature R10 and the imaging side surface S9 and the image source side surface S10 and the radius R10 of the fifth lens L9 of the fifth lens L5.

TABLE 3

F(mm)	38.2000	R6(mm)	-268.4500
				TTL(mm)	149.9712	R7(mm)	-50.7650
R1(mm)	26.7130	F4(mm)	-54.0778
				R2(mm)	16.4580	F5(mm)	41.1771
d1(mm)	7.4960	R9(mm)	43.6750
				R3(mm)	-42.5610	R10(mm)	-84.1240
R4(mm)	-28.4100
				d3(mm)	18.8856

In the present embodiment, R1/(R2+ d1) is 1.115 among the radius of curvature R1 of the imaging-side surface S1 of the first lens L1, the radius of curvature R2 of the image-source-side surface S2 of the first lens L1, and the center thickness d1 of the first lens L1; R3/(R4+ d3) ═ 4.469 is satisfied between the radius of curvature R3 of the imaging-side surface S3 of the second lens L2, the radius of curvature R4 of the image-source-side surface S4 of the second lens L2, and the center thickness d3 of the second lens L2; a radius of curvature R9 of the image-side surface S9 of the fifth lens L5 and a radius of curvature R10 of the image-source-side surface S10 of the fifth lens L5 satisfy R9/R10 — 0.519; the total optical length TTL of the optical lens and the whole group focal length value F of the optical lens meet the condition that TTL/F is 3.926; R6/R7 ═ 5.288 between the radius of curvature R6 of the imaging-side surface S6 of the third lens L3 and the radius of curvature R7 of the image-source-side surface S7 of the third lens L3; F5/F is 1.078 between the focal length value F5 of the fifth lens L5 and the focal length value F of the entire group of optical lenses; and | F5/F4| -0.761 is satisfied between the focal length value F4 of the fourth lens L4 and the focal length value F5 of the fifth lens L5.

Example 2

An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 2 shows a schematic structural diagram of an optical lens according to embodiment 2 of the present application.

As shown in fig. 2, the optical lens includes, in order from the imaging side to the image source side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5.

Table 4 below shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 2, where the radius of curvature R and the thickness T are both in units of millimeters (mm). Table 5 below shows the conic coefficients k and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S1-S4 in example 2. Table 6 below gives the entire set of focal length values F, the total optical length TTL (i.e., the on-axis distance from the center of the imaging side surface S1 of the first lens L1 to the image source side surface IMA), the radii of curvature R1 and R2 of the imaging side surface S1 and the image source side surface S2 of the first lens L1, d1 of the center thickness of the first lens L1, the radii of curvature R3 and R4 of the imaging side surface S3 and the image source side surface S4 of the second lens L2, d3 of the center thickness of the second lens L2, the radii of curvature R6 and R7 of the imaging side surface S6 and the image source side surface S7 of the third lens L3, the value of focal length F4 of the fourth lens L4, the value F5 of the focal length value F5 of the fifth lens L5, and the radii of curvature R10 and the imaging side surface S9 and the image source side surface S10 and the radius R10 of the fifth lens L9 of the fifth lens L5.

TABLE 4

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	40.0933	6.9876	1.59	61.20
2	22.9868	18.9659
					3	-41.5400	18.2600	1.81	41.00
4	-32.7500	-7.6420
					STO	All-round	24.2450
6	-200.6470	18.5689	1.69	54.60
					7	-50.0567	0.4780
8	802.4500	2.5235	1.85	23.80
					9	39.5400	23.4500	1.75	52.30
10	-87.0000	40.0000
					11	All-round	1.1000	1.51	62.90
12	All-round	0.5100
					IMA	All-round

TABLE 5

Flour mark

K

A

B

C

D

E

1

-0.7926

-1.4471E-08

-1.9543E-08

4.0525E-11

-2.7856E-14

-1.0828E-17

2

-0.6945

2.0894E-06

-1.7448E-08

-1.1513E-11

1.9970E-13

-2.7644E-16

3

2.1072

-4.8285E-06

1.0209E-08

-4.5513E-11

1.1310E-13

5.0896E-17

4

-0.5898

-1.3906E-06

-9.9905E-10

5.8787E-12

-1.4194E-14

1.7795E-17

TABLE 6

In the present embodiment, R1/(R2+ d1) 1.338 is satisfied between the radius of curvature R1 of the imaging-side surface S1 of the first lens L1, the radius of curvature R2 of the image-source-side surface S2 of the first lens L1, and the center thickness d1 of the first lens L1; R3/(R4+ d3) ═ 2.867 is satisfied between the radius of curvature R3 of the imaging-side surface S3 of the second lens L2, the radius of curvature R4 of the image-source-side surface S4 of the second lens L2, and the center thickness d3 of the second lens L2; a radius of curvature R9 of an imaging side surface S9 of the fifth lens L5 and a radius of curvature R10 of an image source side surface S10 of the fifth lens L5 satisfy R9/R10 ═ 0.454; the total optical length TTL of the optical lens and the whole group focal length value F of the optical lens meet the condition that TTL/F is 3.874; R6/R7 ═ 4.008 between the radius of curvature R6 of the imaging-side surface S6 of the third lens L3 and the radius of curvature R7 of the image-source-side surface S7 of the third lens L3; F5/F is 1.024 between the focal length value F5 of the fifth lens L5 and the focal length value F of the entire group of optical lenses; and | F5/F4| -0.800 is satisfied between the focal length value F4 of the fourth lens L4 and the focal length value F5 of the fifth lens L5.

Example 3

An optical lens according to embodiment 3 of the present application is described below with reference to fig. 3. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical lens according to embodiment 3 of the present application.

As shown in fig. 3, the optical lens includes, in order from the imaging side to the image source side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5.

The fourth lens L4 is a biconcave lens having a negative power, and both the image-side surface S8 and the image-source-side surface S9 thereof are concave. The fifth lens L5 is a double-convex lens having positive optical power, and both the image-side surface S9 and the image-source-side surface S10 thereof are convex. Wherein, the fourth lens L4 and the fifth lens L5 are cemented with each other to form a cemented lens.

Table 7 below shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 3, where the radius of curvature R and the thickness T are both in units of millimeters (mm). Table 8 below shows the conic coefficients k and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S1-S4 in example 3. Table 9 below gives the entire set of focal length values F, the total optical length TTL (i.e., the on-axis distance from the center of the imaging side surface S1 of the first lens L1 to the image source side surface IMA), the radii of curvature R1 and R2 of the imaging side surface S1 and the image source side surface S2 of the first lens L1, d1 of the center thickness of the first lens L1, the radii of curvature R3 and R4 of the imaging side surface S3 and the image source side surface S4 of the second lens L2, d3 of the center thickness of the second lens L2, the radii of curvature R6 and R7 of the imaging side surface S6 and the image source side surface S7 of the third lens L3, the value of focal length F4 of the fourth lens L4, the value F5 of the focal length value F5 of the fifth lens L5, and the radii of curvature R10 and the imaging side surface S9 and the image source side surface S10 and the radius R10 of the fifth lens L9 of the fifth lens L5.

TABLE 7

TABLE 8

Flour mark

K

A

B

C

D

E

1

-6.4665

-3.1052E-06

-6.5035E-09

1.2105E-11

-2.1787E-14

1.7120E-17

2

-2.0434

1.6749E-06

-6.9126E-09

6.8672E-12

-9.8241E-15

-6.1240E-18

3

3.2119

-9.7140E-06

1.1525E-08

-9.3849E-11

2.7135E-13

-2.1825E-16

4

-0.6212

-1.7914E-06

3.9494E-10

2.0369E-13

-4.7971E-15

1.5597E-17

TABLE 9

F(mm)	38.2400	R6(mm)	-286.5000
				TTL(mm)	143.0532	R7(mm)	-52.5400
R1(mm)	48.0000	F4(mm)	-49.1875
				R2(mm)	22.7500	F5(mm)	39.9257
d1(mm)	8.8700	R9(mm)	47.2000
				R3(mm)	-65.0000	R10(mm)	-81.0000
R4(mm)	-30.5400
				d3(mm)	18.5500

In the present embodiment, R1/(R2+ d1) 1.518 is satisfied between the radius of curvature R1 of the imaging-side surface S1 of the first lens L1, the radius of curvature R2 of the image-source-side surface S2 of the first lens L1, and the center thickness d1 of the first lens L1; R3/(R4+ d3) ═ 5.421 is satisfied between the radius of curvature R3 of the imaging-side surface S3 of the second lens L2, the radius of curvature R4 of the image-source-side surface S4 of the second lens L2, and the center thickness d3 of the second lens L2; a radius of curvature R9 of the image-side surface S9 of the fifth lens L5 and a radius of curvature R10 of the image-source-side surface S10 of the fifth lens L5 satisfy-0.583 of R9/R10; the total optical length TTL of the optical lens and the whole group focal length value F of the optical lens meet the condition that TTL/F is 3.741; R6/R7 ═ 5.453 between the radius of curvature R6 of the imaging-side surface S6 of the third lens L3 and the radius of curvature R7 of the image-source-side surface S7 of the third lens L3; F5/F is 1.044 between the focal length value F5 of the fifth lens L5 and the focal length value F of the entire group of the optical lens; and | F5/F4| -0.812 is satisfied between the focal length value F4 of the fourth lens L4 and the focal length value F5 of the fifth lens L5.

In summary, examples 1 to 3 each satisfy the relationship shown in table 10 below.

Watch 10

Conditions/examples	1	2	3
				R1/(R2+d1)	1.115	1.338	1.518
R3/(R4+d3)	4.469	2.867	5.421
				R9/R10	-0.519	-0.454	-0.583
TTL/F	3.926	3.874	3.741
				R6/R7	5.288	4.008	5.453
F5/F	1.078	1.024	1.044
				\|F5/F4\|	0.761	0.800	0.812

Examples 1 to 3 describe examples of the optical lens according to the embodiment of the present application by taking the projection lens as an example, but it should be understood that these projection lenses are only application examples of the optical lens according to the above-described embodiment of the present application, and should not be construed as a limitation, and the optical lens may also be applied to other fields as needed.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. An optical lens in which the number of lenses having optical power is five, which are: a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element, the first lens element to the fifth lens element being arranged in order from an image side to an image source side along an optical axis,

it is characterized in that the preparation method is characterized in that,

the first lens has negative focal power, the imaging side surface of the first lens is a convex surface, and the image source side surface of the first lens is a concave surface;

the second lens has positive focal power, the imaging side surface of the second lens is a concave surface, and the image source side surface of the second lens is a convex surface;

the third lens has positive focal power, the imaging side surface of the third lens is a concave surface, and the image source side surface of the third lens is a convex surface;

the fourth lens has a negative optical power;

the fifth lens has positive focal power, and both the imaging side surface and the image source side surface of the fifth lens are convex surfaces;

the fourth lens and the fifth lens are mutually glued to form a cemented lens;

the total optical length TTL of the optical lens and the whole group of focal length values F of the optical lens meet the following conditions: TTL/F is less than or equal to 4.5; and

the radius of curvature R3 of the imaging side surface of the second lens, the radius of curvature R4 of the image source side surface of the second lens, and the center thickness d3 of the second lens satisfy: R3/(R4+ d3) is more than or equal to 2 and less than or equal to 6.

2. An optical lens barrel according to claim 1, wherein the fourth lens element has a convex image-side surface and a concave image-source-side surface.

3. An optical lens barrel according to claim 1, wherein the fourth lens has both a concave image-side surface and a concave image-source-side surface.

4. An optical lens according to claim 1, characterized in that the first lens and the second lens are both aspherical lenses.

5. An optical lens according to claim 1, further comprising a diaphragm disposed between the second lens and the third lens.

6. An optical lens according to any one of claims 1 to 5, characterized in that a radius of curvature R1 of an image side surface of the first lens, a radius of curvature R2 of an image source side surface of the first lens and a center thickness d1 of the first lens satisfy: R1/(R2+ d1) is more than or equal to 0.8 and less than or equal to 1.8.

7. An optical lens according to claim 1, characterized in that a radius of curvature R6 of an image side surface of the third lens and a radius of curvature R7 of an image source side surface of the third lens satisfy: R6/R7 is more than or equal to 3.5 and less than or equal to 6.

8. An optical lens barrel according to any one of claims 1 to 5, wherein a radius of curvature R9 of an image-side surface of the fifth lens and a radius of curvature R10 of an image-source-side surface of the fifth lens satisfy: R9/R10 is not less than-0.8 and not more than-0.2.

9. An optical lens according to any one of claims 1 to 5, characterized in that a focal length value F4 of the fourth lens and a focal length value F5 of the fifth lens satisfy: the ratio of F5 to F4 is less than or equal to 1.1.

10. An optical lens according to any one of claims 1 to 5, characterized in that the focal length value F5 of the fifth lens and the entire group of focal length values F of the optical lens satisfy: F5/F is less than or equal to 1.4.

11. An optical lens in which the number of lenses having power is five, and a first lens, a second lens, a third lens, a fourth lens, and a fifth lens are respectively provided, the first lens to the fifth lens being arranged in order from an image side to an image source side along an optical axis,

it is characterized in that the preparation method is characterized in that,

the first lens and the fourth lens each have a negative optical power;

the second lens, the third lens and the fifth lens each have positive optical power;

the imaging side surface of the first lens is a convex surface, and the image source side surface of the first lens is a concave surface;

the imaging side surface of the second lens is a concave surface, and the image source side surface of the second lens is a convex surface;

the imaging side surface of the third lens is a concave surface, and the image source side surface of the third lens is a convex surface;

the imaging side surface and the image source side surface of the fifth lens are convex surfaces;

the total optical length TTL of the optical lens and the whole group of focal length values F of the optical lens meet the following conditions: TTL/F is less than or equal to 4.5;

a radius of curvature R6 of an imaging-side surface of the third lens and a radius of curvature R7 of an image-source-side surface of the third lens satisfy: R6/R7 is more than or equal to 3.5 and less than or equal to 6; and

12. An optical lens barrel according to claim 11, wherein the fourth lens element has a convex image-side surface and a concave image-source-side surface.

13. An optical lens barrel according to claim 11, wherein the fourth lens has both a concave image-side surface and a concave image-source-side surface.

14. An optical lens barrel according to claim 12 or 13, wherein the fourth lens and the fifth lens are cemented to each other to form a cemented lens.

15. An optical lens barrel according to any one of claims 11 to 13, wherein the first lens and the second lens are both aspherical lenses.

16. An optical lens barrel according to any one of claims 11 to 13, further comprising a diaphragm disposed between the second lens and the third lens.

17. An optical lens barrel according to any one of claims 11 to 13, wherein a radius of curvature R1 of an image side surface of the first lens, a radius of curvature R2 of an image source side surface of the first lens, and a center thickness d1 of the first lens satisfy: R1/(R2+ d1) is more than or equal to 0.8 and less than or equal to 1.8.

18. An optical lens barrel according to any one of claims 11 to 13, wherein a radius of curvature R9 of an image-side surface of the fifth lens and a radius of curvature R10 of an image-source-side surface of the fifth lens satisfy: R9/R10 is not less than-0.8 and not more than-0.2.

19. An optical lens according to any one of claims 11-13, characterized in that between the focal length value F4 of the fourth lens and the focal length value F5 of the fifth lens, it is satisfied that: the ratio of F5 to F4 is less than or equal to 1.1.

20. An optical lens according to any one of claims 11 to 13, characterized in that the focal length value F5 of the fifth lens and the entire group of focal length values F of the optical lens satisfy: F5/F is less than or equal to 1.4.