CN110412717B

CN110412717B - Optical lens

Info

Publication number: CN110412717B
Application number: CN201810397014.XA
Authority: CN
Inventors: 姚波; 栾晓宇; 王东方
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2018-04-28
Filing date: 2018-04-28
Publication date: 2021-11-12
Anticipated expiration: 2038-04-28
Also published as: CN110412717A

Abstract

The application discloses an optical lens. In one embodiment, an optical lens, in order from an object side to an image side along an optical axis, comprises: the lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the first lens has negative focal power, and the object side surface and the image side surface of the first lens are both concave surfaces; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, and the object side surface and the image side surface of the third lens are convex surfaces; the fourth lens and the fifth lens are glued together. By utilizing the optical lens, the angle resolution of the optical lens can be improved and a long-focus large field angle can be realized by reasonably matching and designing the lenses; and/or to achieve miniaturization and cost reduction as much as possible while ensuring image quality.

Description

Optical lens

Technical Field

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

Background

In order to meet the rapid development of the vehicle-mounted lens technology market and the requirement of the diversity of the client applications, a lens with a composite function needs to be designed.

The traditional forward-looking lens has the characteristic of small tele field of view, and can capture long-distance objects; the traditional rearview mirror head has the characteristics of wide angle and short focal length. Therefore, if a single front-view lens needs to enlarge the overall observation field of view, the wide-angle lens is used in cooperation with software to complete picture splicing together.

In addition, with the development of active safety in the automotive industry, the demand for front view lenses is increasing, and for example, miniaturization, high pixel count, and the like are indispensable performances of such lenses.

To meet these requirements, it has become a necessary trend to introduce aspherical lenses in the front-view lenses.

Disclosure of Invention

The present application provides an optical lens suitable for vehicle-mounted mounting that overcomes at least one of the above-mentioned deficiencies in the prior art.

An aspect of the present application provides an optical lens, in order from an object side to an image side along an optical axis, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the first lens has negative focal power, and the object side surface and the image side surface of the first lens are both concave surfaces; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, and the object side surface and the image side surface of the third lens are convex surfaces; the fourth lens and the fifth lens are glued together.

In some alternative embodiments, the fourth lens has a negative power, and the object-side surface of the fourth lens is convex and the image-side surface of the fourth lens is concave; and the fifth lens has positive focal power, and the object-side surface and the image-side surface of the fifth lens are both convex surfaces.

In some alternative embodiments, a stop is disposed between the third lens and the fourth lens.

In certain alternative embodiments, the first lens is a glass optic.

In some alternative embodiments, at least two of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are aspheric lenses.

In some alternative embodiments, the second lens is an aspheric lens.

In some alternative embodiments, the optical lens satisfies the conditional expression: R1/F is less than or equal to-10, wherein R1 is the curvature radius of the object side surface of the first lens; and F is the whole group focal length value of the optical lens.

In some alternative embodiments, the second lens of the optical lens satisfies the conditional expression: 0.5 ≦ R3 |/(| R4 | + d3) ≦ 1.5, where R3 is the radius of curvature of the object-side surface of the second lens; r4 is the radius of curvature of the image-side surface of the second lens; and d3 is the center thickness of the second lens.

In some alternative embodiments, the optical lens satisfies the conditional expression: (FOV multiplied by F)/h is more than or equal to 70, wherein the FOV is the maximum field angle of the optical lens; f is the whole group of focal length values of the optical lens; and h is the image height corresponding to the maximum field angle of the optical lens.

In some alternative embodiments, the optical lens satisfies the conditional expression: TTL/h/FOV is less than or equal to 0.035, wherein TTL is the distance from the center of the object side surface of the first lens of the optical lens to the imaging surface of the optical lens; h is the image height corresponding to the maximum field angle of the optical lens; and FOV is the maximum field angle of the optical lens.

A second aspect of the present application provides an optical lens, in order from an object side to an image side along an optical axis, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the first lens and the second lens have negative focal power; the third lens has positive focal power; and the optical lens satisfies the conditional expression: TTL/h/FOV is less than or equal to 0.035, wherein TTL is the distance from the center of the object side surface of the first lens of the optical lens to the imaging surface of the optical lens, and h is the image height corresponding to the maximum field angle of the optical lens; and FOV is the maximum field angle of the optical lens.

In some alternative embodiments, both the object-side surface and the image-side surface of the first lens are concave.

In some alternative embodiments, the object-side surface of the second lens element is convex and the image-side surface of the second lens element is concave.

In some alternative embodiments, both the object-side surface and the image-side surface of the third lens are convex.

In some alternative embodiments, the fourth lens and the fifth lens are cemented together.

In certain alternative embodiments, the first lens is a glass optic.

In some alternative embodiments, the second lens is an aspheric lens.

By adopting the technical scheme of the application, at least one of the following beneficial effects can be realized by reasonably collocating the glass lens and the plastic lens, introducing the aspheric lens and reasonably and cooperatively designing the shape and the focal power of the lens:

1) the visual range is directly expanded by the front-view lens to replace a plurality of traditional lenses with single function in a driving system, so that the single lens can realize a composite function and is compatible with the functions of a long-focus lens and a short-focus lens;

2) the central area of the optical lens has large-angle resolution, so that the identification degree of an environmental object can be improved, and the detection area of the central part is increased in a targeted manner;

3) the integral focal length is longer, the field range is larger, and the field angle can reach more than 140 degrees; and

4) miniaturization is realized while ensuring the imaging quality, and the cost is reduced as much as possible.

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; and

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

Detailed Description

Various aspects of the present application will be described in detail below with reference to the attached figures to provide a better understanding of the present application. 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.

Throughout this specification and throughout the drawings, like reference numerals refer to like elements. For convenience of description, only portions related to the technical subject are shown in the drawings. Further, in the drawings, the size and shape of some elements, components or parts may be exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.

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

The application relates to an optical lens with five lenses, which is mainly applied to optical imaging, in particular to optical imaging of vehicle-mounted equipment.

According to an exemplary embodiment of the present application, an optical lens, in order from an object side to an image side along an optical axis, includes: the lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The light ray sequentially propagates from the object side of the first lens through the first lens, the second lens, the third lens, the fourth lens and the fifth lens and finally reaches an imaging surface. According to needs, the optical lens according to the present application may further include an optical filter disposed between the fifth lens and the image plane to filter light rays having different wavelengths; and may further include a protective glass disposed between the optical filter and the imaging surface to prevent internal elements (e.g., a chip) of the optical lens from being damaged.

The first lens has a negative optical power, and both the object-side surface and the image-side surface of the first lens are concave.

In an alternative embodiment, the radius of curvature R1 of the object-side surface of the first lens and the entire set of focal length values F of the optical lens satisfy the conditional expression: R1/F.ltoreq.10, for example, may further satisfy the conditional formula: R1/F is less than or equal to-12.

By designing the object side surface of the first lens to be concave and by making the first lens satisfy the conditional expression R1/F ≦ -10, the object side surface of the first lens can be made flat, thereby facilitating collection of large-angle light rays, collecting as much light rays as possible into the rear optical system, and facilitating realization of wide-angle and large-angle resolution. In addition, in practical applications, the on-board lens may be mounted outside the vehicle body; the flatter shape of the object side surface of the first lens can accelerate the sliding speed of water drops, thereby reducing the influence on imaging to the maximum extent.

In an alternative embodiment, the first lens may be provided as a glass lens. By using glass lenses, high resolution over a wide temperature range can be achieved to be suitable for vehicle applications. However, it is worth mentioning that the optical lens according to the present application can be applied to other fields as well, and when it is applied to other fields, lenses made of different materials can be selected as needed.

The second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface. In this way, the second lens can disperse light, so that the light (specifically, large-angle light) can be smoothly transited to the rear optical system.

In an alternative embodiment, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, and the center thickness d3 of the second lens satisfy the conditional expression: 0.5 ≦ R3 ≦ 1.5 ≦ (|. R4 | + d3), for example, the condition may further be satisfied: | -R3 |/(| R4 | + d3) ≦ 1.3. By satisfying the conditional expression 0.5 ≦ R3 |/(| R4 | + d3) ≦ 1.5, it is helpful to shorten the optical path of the optical lens and reduce the total length of the optical system.

Alternatively, the second lens may be a plastic optic, or the second lens may also be a glass optic.

In an alternative embodiment, the second lens may be provided as an aspherical mirror in order to improve the resolution. Further alternatively, the second lens may be provided in a special shape close to a concentric circle.

In the case that the second lens is a glass lens, compared with a spherical glass lens close to a concentric circle, the aspheric surface is easier to process; on the other hand, the shape of the concentric circles helps to shorten the optical path and reduce the total length of the system.

The third lens has positive focal power, and the object-side surface and the image-side surface of the third lens are convex surfaces. Therefore, the third lens can converge the light, so that the divergent light can smoothly enter the rear part.

Optionally, the third lens is a spherical lens to correct off-axis point aberration, reduce distortion, and improve imaging quality.

The fourth lens and the fifth lens are glued together. By gluing the fourth lens and the fifth lens, self achromatism can be realized, tolerance sensitivity is reduced, and partial chromatic aberration can be remained to balance chromatic aberration of a system. In addition, the air space is omitted, so that the whole optical system is compact, the miniaturization requirement is met, and meanwhile, the tolerance sensitivity problem caused by inclination/core deviation and the like generated in the assembling process of the lens unit is reduced.

In an alternative embodiment, the fourth lens has a negative power, and the object-side surface of the fourth lens is convex and the image-side surface of the fourth lens is concave; and the fifth lens has positive focal power, and the object-side surface and the image-side surface of the fifth lens are both convex surfaces.

The fourth lens and the fifth lens are glued in a mode that the negative film is arranged in front of the positive film, and the positive film is arranged behind the negative film, so that light rays can be diffused and converged through the mutual matching of the negative film and the positive film, and the caliber/size of the rear end of the optical lens is reduced. In addition, the optical length of the optical lens (namely, the distance from the center of the object side surface of the first lens of the optical lens to the imaging surface of the optical lens) is shortened.

Optionally, the fourth lens and the fifth lens are both plastic lenses. Further preferably, the fourth lens and the fifth lens are plastic aspheric lenses and are bonded to form a plastic bonded member, so that the performance is improved, the optical total length is shortened, and the cost is greatly reduced.

In an alternative embodiment, to improve the resolution, at least two of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are aspheric lenses.

In an alternative embodiment, a diaphragm is arranged between the third lens and the fourth lens. The diaphragm can collect front and back light rays, shorten the total length of the optical system and reduce the calibers of the front and back lens groups. It should be noted, however, that the positions of the diaphragms disclosed herein are merely examples and not limitations; in alternative embodiments, the diaphragm may be disposed at other positions according to actual needs.

In an alternative embodiment, the maximum field angle FOV of the optical lens, the entire group of focal length values F of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens satisfy the conditional expression: (FOV XF)/h.gtoreq.70, for example, the conditional expression can be further satisfied: (FOV multiplied by F)/h is more than or equal to 80. By satisfying the conditional expression (FOV multiplied by F)/h is more than or equal to 70, the optical lens is favorable for realizing a long-focus large field angle and a central large angular resolution.

In an alternative embodiment, a distance TTL from a center of an object-side surface of the first lens of the optical lens to an imaging surface of the optical lens, an image height h corresponding to a maximum field angle of the optical lens, and a maximum field angle FOV of the optical lens satisfy the conditional expression: TTL/h/FOV ≦ 0.035, for example, the conditional expression may further be satisfied: TTL/h/FOV is less than or equal to 0.03. By satisfying the conditional expression TTL/h/FOV less than or equal to 0.035, the optical lens can be miniaturized, and specifically, for the same imaging surface, the optical length TTL of the optical lens is shorter than that of other lenses.

According to the optical lens disclosed by the application, a plurality of glass lenses and/or plastic lenses, for example, the five lenses, are reasonably matched, designed and arranged, so that a single lens can realize a composite function and is compatible with functions of a long-focus lens and a short-focus lens; and/or enabling the central area of the optical lens to have large-angle resolution; and/or the field angle of the optical lens can reach more than 140 degrees; and/or to achieve miniaturization and cost reduction as much as possible while ensuring image quality.

It should be noted that although the present application shows that the optical lens includes only five lenses, the number is merely exemplary and not limiting. For example, those skilled in the art will appreciate that the number of lenses may be varied without departing from the claimed subject matter.

The present application will be further described with reference to specific embodiments with reference to the accompanying 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 an object side to an image side along an 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 biconcave lens with negative optical power, and both the object-side surface S1 and the image-side surface S2 are concave. The second lens L2 is a negative meniscus lens with a convex surface facing the object side, and has a convex object side surface S3 and a concave image side surface S4. The third lens L3 is a biconvex lens with positive optical power, and has both the object-side surface S5 and the image-side surface S6 being convex. The fourth lens L4 is a negative meniscus lens with a convex surface facing the object side, the object side surface S8 is convex, and the image side surface S9 is concave. The fifth lens L5 is a biconvex lens with positive optical power, and has both the object-side surface S9 and the image-side surface S10 convex.

In the present embodiment, the fourth lens L4 and the fifth lens L5 are cemented together, and therefore, the image-side surface S9 of the fourth lens L4 and the object-side surface S9 of the fifth lens L5 are the same surface.

The second lens L2, the fourth lens L4, and the fifth lens L5 are aspherical lenses. In other words, the object-side surface S3 and the image-side surface S4 of the second lens L2, the object-side surface S8 and the image-side surface S9 of the fourth lens L4, and the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are aspheric.

Optionally, a filter L6 is disposed behind the fifth lens L5, and the filter L6 includes an object side surface S11 and an image side surface S12. A protective glass L7 is provided behind the image side surface S12 of the filter L6, and the protective glass L7 includes an object side surface S13 and an image side surface S14. An imaging surface IMA (i.e., S15) is provided behind the image side surface S14 of the protective glass L7 to receive an image formed by the optical system.

Optionally, a stop STO is disposed between the third lens L3 and the cemented piece formed by the fourth lens L4 and the fifth lens L5 to converge front and rear light rays, so as to reduce the aperture of the front and rear lens groups and improve the imaging quality.

Table 1 shows surface parameters of each lens of the optical lens of example 1, including a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd, 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	-47.7300	1.0000	1.77	49.6
2	7.1437	0.8800
					3	2.8800	1.7300	1.51	56.2
4	1.8600	2.8437
					5	14.5000	3.7000	1.88	31.3
6	-8.6281	0.4272
					STO	Infinity(s)	0.1000
8	8.0088	0.8643	1.64	23.5
					9	1.8974	2.1300	1.53	56.1
10	-6.1200	0.1310
					11	Infinity(s)	0.5000	1.52	64.2
12	Infinity(s)	1.9449
					13	Infinity(s)	0.4000	1.52	64.2
14	Infinity(s)	1.7957
					IMA	Infinity(s)

Since the second lens L2, the fourth lens L4, and the fifth lens L5 in the present embodiment are aspherical lenses, the aspherical surface types Z of the respective surfaces thereof satisfy the following formula:

wherein, Z (h) is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction; c is paraxial curvature of the aspheric surface, wherein c is 1/R, and R represents curvature radius of the aspheric surface mirror surface; k is the conic coefficient conc; A. b, C, D, E are all high order term coefficients.

Table 2 shows the conic coefficients K and the high-order term coefficients A, B, C, D, E of the surfaces S3, S4, S8, S9, and S10 applied to each aspherical lens in the present embodiment.

TABLE 2

Flour mark

K

A

B

C

D

E

3

-1.0551

2.0466E-03

-7.1400E-04

1.9922E-05

-1.4556E-06

8.3309E-08

4

-0.8816

7.0816E-03

-2.1538E-03

9.9544E-05

1.0928E-05

-8.7685E-08

8

-0.3726

-3.1300E-04

-2.5621E-03

1.9399E-03

-5.6004E-04

1.2182E-05

9

-50.0000

1.0570E-03

-1.2180E-02

1.0471E-02

-3.0977E-03

2.6287E-04

10

-43.5232

-1.6801E-02

5.7768E-03

-1.3652E-03

1.3190E-04

4.1014E-07

Table 3 shows a curvature radius R1 of the object-side surface of the first lens, a focal length value F of the entire group of the optical lens, an optical length TTL of the optical lens (i.e., a distance from the center of the object-side surface S1 of the first lens L1 of the optical lens to the imaging surface S15 of the optical lens), an image height h corresponding to the maximum field angle of the optical lens, the maximum field angle FOV of the optical lens, a curvature radius R3 of the object-side surface of the second lens, a curvature radius R4 of the image-side surface of the second lens, and a center thickness d3 of the second lens in the present embodiment.

TABLE 3

Parameter(s)	R1(mm)	F(mm)	TTL(mm)	h(mm)
					Numerical value	-47.730	3.898	18.447	5.408
Parameter(s)	FOV(°)	R3(mm)	R4(mm)	d3(mm)
					Numerical value	140	2.880	1.860	1.730

In the present embodiment, R1/F-12.244 is satisfied between the radius of curvature R1 of the object-side surface of the first lens and the entire group focal length value F of the optical lens; the TTL/h/FOV between the optical length TTL of the optical lens, the image height h corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens is 0.024; 100.918 is satisfied among the maximum field angle FOV of the optical lens, the whole group of focal length values F of the optical lens and the image height h corresponding to the maximum field angle of the optical lens; the radius of curvature R3 of the object-side surface of the second lens element, the radius of curvature R4 of the image-side surface of the second lens element and the center thickness d3 of the second lens element satisfy | R3 |/(| R4 | + d3) | -0.802.

Example 2

An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. 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 object side to the image 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.

Optionally, a stop STO is disposed between the third lens L3 and the cemented piece formed by the fourth lens L4 and the fifth lens L5 to converge front and rear light beams, thereby reducing the aperture of the front and rear lens groups.

Table 4 shows surface parameters of each lens of the optical lens of example 2, including a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd, where the radius of curvature R and the thickness T are both in units of millimeters (mm).

TABLE 4

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	-48.0000	1.0500	1.77	49.6
2	7.1050	0.8852
					3	2.8745	1.7300	1.51	56.3
4	1.8607	2.8437
					5	14.3222	3.7500	1.85	32.0
6	-8.6281	0.4300
					STO	Infinity(s)	0.1000
8	8.0087	0.8645	1.65	24.5
					9	1.8800	2.1200	1.54	55.0
10	-6.3200	0.1310
					11	Infinity(s)	0.5000	1.52	64.2
12	Infinity(s)	1.9449
					13	Infinity(s)	0.4000	1.52	64.2
14	Infinity(s)	2.8935
					IMA	Infinity(s)

Since the second lens L2, the fourth lens L4, and the fifth lens L5 in the present embodiment are aspherical lenses, the aspherical surface types Z of the respective surfaces thereof also satisfy the above formula (1).

Table 5 shows the conic coefficients K and the high-order term coefficients A, B, C, D, E of the surfaces S3, S4, S8, S9, and S10 applied to each aspherical lens in the present embodiment.

TABLE 5

Table 6 shows a curvature radius R1 of the object-side surface of the first lens, a focal length value F of the entire group of the optical lens, an optical length TTL of the optical lens (i.e., a distance from the center of the object-side surface S1 of the first lens L1 of the optical lens to the imaging surface S15 of the optical lens), an image height h corresponding to the maximum field angle of the optical lens, the maximum field angle FOV of the optical lens, a curvature radius R3 of the object-side surface of the second lens, a curvature radius R4 of the image-side surface of the second lens, and a center thickness d3 of the second lens in the present embodiment.

TABLE 6

Parameter(s)	R1(mm)	F(mm)	TTL(mm)	h(mm)
					Numerical value	-48.000	3.996	19.643	6.288
Parameter(s)	FOV(°)	R3(mm)	R4(mm)	d3(mm)
					Numerical value	140	2.874	1.861	1.730

In the present embodiment, R1/F-12.013 is satisfied between the radius of curvature R1 of the object-side surface of the first lens and the entire group focal length value F of the optical lens; the TTL/h/FOV between the optical length TTL of the optical lens, the image height h corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens is equal to 0.022; 88.959 is satisfied among the maximum field angle FOV of the optical lens, the whole group of focal length values F of the optical lens and the image height h corresponding to the maximum field angle of the optical lens; the radius of curvature R3 of the object-side surface of the second lens element, the radius of curvature R4 of the image-side surface of the second lens element and the center thickness d3 of the second lens element satisfy | R3 |/(| R4 | + d3) | -0.801.

In summary, examples 1 to 2 each satisfy the relationship shown in table 7 below.

TABLE 7

Examples of conditions	R1/F	TTL/h/FOV	(FOV×F)/h	∣R3∣/(∣R4∣+d3)
					1	-12.244	0.024	100.918	0.802
2	-12.013	0.022	88.959	0.801

In addition, the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Throughout this document, the terms are not limited to the meanings literally defined, but cover different means for performing the same or similar functions, without departing from the scope of the present application as defined in the appended claims.

For example, ordinal terms such as "first," "second," etc., are used only to distinguish one element from another, and do not limit the order or importance thereof; spatially relative terms such as "upper", "lower", and the like, are not limited to the orientation shown in the drawings, but include different orientations of the device in use; the term "and/or" includes any and all combinations of one or more of the associated listed items; the terms "comprises," "comprising," and/or "having," when used in this specification, specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof; the term "exemplary" is intended to mean exemplary or illustrative; the terms "substantially," "about," and the like represent approximations, not degrees, and are intended to indicate inherent deviations in measured or calculated values that will be recognized by those of ordinary skill in the art; in describing embodiments of the present application, the term "may" mean "one or more embodiments of the present application; when appearing after a list of listed features, terms such as "at least one of … …" modify the entire list rather than individual elements of the list. In addition, in the embodiments of the present application, the singular form may include plural meanings unless otherwise specified in the reverse direction.

It is to be understood that, 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. Furthermore, terms (e.g., terms 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.

The above description is only for the purpose of illustrating the preferred embodiments of the present application and the principles of the present application. It will be appreciated by a person skilled in the art that the scope of the application referred to in the present application is not limited to the solution according to the specific combination of the above-mentioned technical features, but that the present application shall also cover other solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of the present application. For example, the above features and the technical features having similar functions disclosed in the present application are mutually replaced to form the technical solution.

Claims

1. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens,

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

the first lens has negative focal power, and the object side surface and the image side surface of the first lens are both concave surfaces;

the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

the third lens has positive focal power, and both the object-side surface and the image-side surface of the third lens are convex surfaces; and

the fourth lens and the fifth lens are cemented together, wherein the fourth lens has a negative optical power and the fifth lens has a positive optical power,

wherein the number of lenses having a focal power in the optical lens is five, an

Wherein, the optical lens satisfies the conditional expression:

(FOV×F)/h≥70°

wherein the content of the first and second substances,

the FOV is the maximum field angle of the optical lens;

f is the whole group of focal length values of the optical lens; and

h is the image height corresponding to the maximum field angle of the optical lens.

2. An optical lens according to claim 1,

the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; and

the object side surface and the image side surface of the five lenses are convex surfaces.

3. An optical lens according to claim 1, characterized in that a diaphragm is arranged between the third lens and the fourth lens.

4. An optical lens according to claim 1, characterized in that the first lens is a glass lens.

5. An optical lens according to claim 1, wherein at least two of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are aspheric lenses.

6. An optical lens according to claim 5, characterized in that the second lens is an aspherical mirror.

7. An optical lens according to any one of claims 1 to 6, characterized in that the optical lens satisfies the conditional expression:

R1/F≤-10

wherein the content of the first and second substances,

r1 is the radius of curvature of the object-side surface of the first lens; and

f is the whole group of focal length values of the optical lens.

8. An optical lens according to any one of claims 1 to 6, characterized in that the second lens of the optical lens satisfies the conditional expression:

0.5≤|R3|/(|R4|+d3)≤1.5

wherein the content of the first and second substances,

r3 is the radius of curvature of the object-side surface of the second lens;

r4 is the radius of curvature of the image-side surface of the second lens; and

d3 is the center thickness of the second lens.

9. An optical lens according to any one of claims 1 to 6, characterized in that the optical lens satisfies the conditional expression:

TTL/h/FOV×180°≤6.3

wherein the content of the first and second substances,

TTL is a distance from the center of the object-side surface of the first lens element of the optical lens to the imaging surface of the optical lens.

10. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens,

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

the first lens and the second lens have negative optical power;

the third lens has positive optical power;

the fourth lens has a negative optical power, the fifth lens has a positive optical power, an

The optical lens satisfies the conditional expression:

TTL/h/FOV×180°≤6.3

(FOV×F)/h≥70°

wherein TTL is a distance from the center of the object side surface of the first lens element of the optical lens to the imaging surface of the optical lens, h is an image height corresponding to the maximum field angle of the optical lens, FOV is the maximum field angle of the optical lens, and F is the whole group focal length value of the optical lens,

wherein the number of lenses having optical power in the optical lens is five.

11. An optical lens barrel according to claim 10, wherein the object side surface and the image side surface of the first lens are both concave.

12. An optical lens barrel according to claim 10, wherein the object side surface of the second lens element is convex and the image side surface of the second lens element is concave.

13. An optical lens barrel according to claim 10, wherein the object side surface and the image side surface of the third lens are convex.

14. An optical lens barrel according to claim 10, wherein the fourth lens and the fifth lens are cemented together.

15. An optical lens according to claim 10,

16. An optical lens according to claim 10, characterized in that a diaphragm is arranged between the third lens and the fourth lens.

17. An optical lens according to claim 10, characterized in that the first lens is a glass lens.

18. An optical lens according to claim 10, wherein at least two of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are aspheric lenses.

19. An optical lens according to claim 10, characterized in that the second lens is an aspherical mirror.

20. An optical lens according to any one of claims 10 to 19, characterized in that the optical lens satisfies the conditional expression:

R1/F≤-10

wherein R1 is the radius of curvature of the object-side surface of the first lens; and F is the whole group of focal length values of the optical lens.

21. An optical lens according to any one of claims 10 to 19, characterized in that the second lens of the optical lens satisfies the conditional expression:

0.5≤|R3|/(|R4|+d3)≤1.5

wherein R3 is the radius of curvature of the object-side surface of the second lens; r4 is the radius of curvature of the image-side surface of the second lens; and d3 is the center thickness of the second lens.