CN113625419A

CN113625419A - Optical lens and imaging apparatus including the same

Info

Publication number: CN113625419A
Application number: CN202010376899.2A
Authority: CN
Inventors: 张俊明; 俞魁榜; 徐超; 杨佳
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2020-05-07
Filing date: 2020-05-07
Publication date: 2021-11-09
Anticipated expiration: 2040-05-07
Also published as: CN113625419B

Abstract

An optical lens and an imaging apparatus including the same are disclosed. The optical lens sequentially comprises from an object side to an image side along an optical axis: 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 image side surface of the first lens is a concave surface; 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 image side surface of the third lens is a convex surface; the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; the fifth lens element has positive focal power, and has a convex object-side surface and a concave image-side surface.

Description

Optical lens and imaging apparatus including the same

Technical Field

The present invention relates to the field of lenses, and more particularly, to an optical lens including five lenses and an imaging apparatus including the same.

Background

With the rapid development of the automobile driving assistance system, optical systems or modules in the vehicle-mounted field are increasingly applied. The definition of the image acquired by the vehicle-mounted lens has a crucial influence on the safety of the driver. In order to be able to adapt to daytime and low-light use, this type of lens requires a large aperture. The existing optical system or module applying the vehicle-mounted field generally has the problems of too many lenses, complex structure, too small aperture or too low image quality, and is difficult to meet the actual requirement.

Accordingly, there is a need for optical lenses and systems that address the above-mentioned problems.

Disclosure of Invention

In one aspect, 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 can have negative focal power, and the image side surface of the first lens can be a concave surface; the second lens can have negative focal power, and the object side surface of the second lens can be a convex surface, and the image side surface of the second lens can be a concave surface; the third lens can have positive focal power, and the image side surface of the third lens can be a convex surface; the fourth lens can have positive focal power, and both the object side surface and the image side surface of the fourth lens can be convex surfaces; the fifth lens element can have a positive power, and can have a convex object-side surface and a concave image-side surface.

In one embodiment, the object side surface of the first lens may be convex.

In one embodiment, the object side surface of the first lens may be concave.

In one embodiment, the object side surface of the third lens can be convex.

In one embodiment, the object side surface of the third lens may be concave.

In one embodiment, the second lens and the fifth lens may each be an aspheric lens.

In one embodiment, the total optical length TTL of the optical lens and the whole group of focal length values F of the optical lens can satisfy that TTL/F is less than or equal to 5.8.

In one embodiment, the maximum field angle FOV of the optical lens, the total optical length TTL of the optical lens and the image height H corresponding to the maximum field angle of the optical lens can satisfy TTL/H/FOV ≦ 0.1.

In one embodiment, the maximum field angle FOV of the optical lens, the maximum light transmission diameter D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy D/H/FOV ≦ 0.035.

In one embodiment, the focal length value F1 of the first lens and the focal length value F of the whole set of the optical lens can satisfy | F1/F | ≦ 3.5.

In one embodiment, the combined focal length value F34 of the third lens and the fourth lens and the entire set of focal length values F of the optical lens can satisfy 1.0 ≦ F34/F ≦ 2.0.

In one embodiment, the focal length value F3 of the third lens and the focal length value F4 of the fourth lens may satisfy 0.4 ≦ F3/F4 ≦ 1.3.

In one 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 may satisfy 0.4 ≦ R3/(R4+ d3) ≦ 1.4.

In one embodiment, the radius of curvature R8 of the object-side surface of the fourth lens and the radius of curvature R9 of the image-side surface of the fourth lens can satisfy 1.0 ≦ R8/R9 ≦ 1.8.

In one embodiment, the thickness d6 of the third lens, the thickness d8 of the fourth lens, and the thickness d10 of the fifth lens may satisfy max { dn/dm } ≦ 1.8, where n ═ 6, 8, or 10, and m ═ 6, 8, or 10.

In one embodiment, the Sg value SAG (10) corresponding to the maximum clear aperture of the object side surface of the fifth lens and the thickness d10 of the fifth lens meet arctan (SAG (10)/d10) ≧ 45.

In one embodiment, the whole group focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens system satisfy F/ENPD ≦ 1.2.

In another aspect, the present application provides an optical lens, in order from an object side to an image side along an optical axis, comprising: a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the first lens may have a negative power; the second lens can have negative focal power, and the object side surface of the second lens can be a convex surface, and the image side surface of the second lens can be a concave surface; the third lens may have a positive optical power; the fourth lens can have positive focal power, and both the object side surface and the image side surface of the fourth lens can be convex surfaces; the fifth lens has positive focal power, and the object side surface of the fifth lens can be a convex surface, and the image side surface of the fifth lens can be a concave surface; the whole group of focal length values F of the optical lens and the entrance pupil diameter ENPD of the optical lens system can meet the condition that F/ENPD is less than or equal to 1.2.

In one embodiment, the object-side surface of the first lens element can be convex and the image-side surface can be concave.

In one embodiment, both the object-side surface and the image-side surface of the first lens can be concave.

In one embodiment, both the object-side surface and the image-side surface of the third lens can be convex.

In one embodiment, the object-side surface of the third lens element can be concave and the image-side surface can be convex.

On the other hand, the present application also provides an imaging apparatus including the above optical lens and an imaging element for converting an optical image formed by the optical lens into an electric signal.

Embodiments according to the present application may provide a small FNO lens. The lens of this application only uses five lenses, simple structure, and the cost is reduced has higher image quality simultaneously. Through leading the diaphragm, can dwindle the camera lens front end bore when increasing the luminous flux to can shorten camera lens length by a wide margin and be favorable to realizing the miniaturization of camera lens, thereby be convenient for realize the assembly in finite space in some special fields. Meanwhile, the thickness of each lens is reasonably distributed, so that the optical performance of the optical lens can be kept stable within-40-105 ℃, and the optical lens has excellent temperature stability.

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;

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

fig. 4 is a schematic structural view showing an optical lens according to embodiment 4 of the present application;

fig. 5 is a schematic structural view showing an optical lens according to embodiment 5 of the present application;

fig. 6 is a schematic structural view showing an optical lens according to embodiment 6 of the present application;

fig. 7 is a schematic structural view showing an optical lens according to embodiment 7 of the present application; and

fig. 8 is a schematic view showing a structure of an optical lens according to embodiment 8 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 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. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the image side is called the image side surface of the lens.

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 powers, i.e., a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are arranged along the optical axis in sequence from the object side to the image side.

The optical lens according to the exemplary embodiment of the present application may further include a photosensitive element disposed on the image plane. Alternatively, the photosensitive element provided to the imaging surface may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).

The first lens may have a negative power, which may have a meniscus shape or a biconcave shape, facilitating compression of light, achieving a small FNO, increasing the amount of light transmitted. The first lens can use high refractive index material (Nd1 is more than or equal to 1.65), which is beneficial to reducing the front end aperture to improve the imaging quality. The image side surface of the first lens can be concave. Alternatively, the object-side surface of the first lens element can be convex and the image-side surface can be concave. Optionally, both the object-side surface and the image-side surface of the first lens are concave.

The second lens element can have a negative power, and can have a convex object-side surface and a concave image-side surface. The special shape of the second lens can make the peripheral light beam and the central light beam have optical path difference, which is beneficial to optimizing astigmatism. The second lens may be a lens having an aspherical surface. The aspheric surface is used, so that aberration can be optimized, and light can be smoothly transited. Optionally, both the object side and the image side of the second lens may be aspheric.

Optionally, a diaphragm may be placed between the second lens and the third lens. The diaphragm is arranged in front, so that the lens aperture at the front end of the lens can be effectively reduced, and the realization of small FNO is facilitated. Furthermore, the diaphragm can be arranged in front of the first lens, and the arrangement is more favorable for reducing the aperture of the lens at the front end of the lens. It should be noted, however, that the positions of the diaphragms disclosed herein are merely exemplary and not limiting, and in alternative embodiments, diaphragms may be disposed at other positions as may be desired.

The third lens may have a positive power, an object side thereof may be flat, an image side thereof may be curved, and it may have a meniscus shape. The shape of the third lens is favorable for compressing light, so that small FNO is realized, and the aperture of the system is reduced. The image-side surface of the third lens element may be convex. Optionally, both the object-side surface and the image-side surface of the third lens can be convex. Alternatively, the object-side surface of the third lens element may be concave, and the image-side surface may be convex.

The fourth lens element can have a positive optical power, and can have a convex object-side surface and a convex image-side surface. The fourth lens can make the light trend transition steadily, compress the bore to further promote the resolution quality.

The fifth lens element can have a positive power, can have a convex object-side surface and a concave image-side surface, and can have a meniscus shape. Optionally, both the object side and the image side of the fifth lens may be aspheric. The meniscus positive focal power aspheric lens structure of the fifth lens is beneficial to improving aberration and improving imaging quality.

In an exemplary embodiment, both the object side and the image side of the second lens and the fifth lens may be aspheric. The aspheric lens of the second lens and the fifth lens can eliminate aberration, improve image resolution, reduce total length and reduce sensitivity.

In an exemplary embodiment, a total optical length TTL of an optical lens (i.e., a distance from an object-side center of a first lens of the optical lens to an imaging plane center 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 5.8. More specifically, TTL and F can further satisfy TTL/F ≦ 5.6, e.g., 4.54 ≦ TTL/F ≦ 5.39. TTL and F are reasonably controlled, and miniaturization is facilitated.

In an exemplary embodiment, the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: TTL/H/FOV is less than or equal to 0.1. More specifically, TTL, H, and FOV further can satisfy TTL/H/FOV ≦ 0.08, e.g., 0.05 ≦ TTL/H/FOV ≦ 0.06. Through reasonable control of TTL, H and FOV, the lens group is compact in structure, the sensitivity of the lens to MTF is reduced, the production yield is improved, and the production cost is reduced.

In an exemplary embodiment, the maximum field angle FOV of the optical lens, the maximum light-passing diameter D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: D/H/FOV is less than or equal to 0.035. More specifically, D, H and FOV further can satisfy D/H/FOV ≦ 0.03, such as 0.018 ≦ D/H/FOV ≦ 0.023. Rational control D, H and the FOV allow the front port diameter to be small, thereby allowing for miniaturization.

In an exemplary embodiment, the focal length value F1 of the first lens and the entire set of focal length values F of the optical lens may satisfy: the ratio of F1/F is less than or equal to 3.5. More specifically, F1 and F can further satisfy | F1/F | ≦ 3, such as 2.03 ≦ F1/F ≦ 2.65. The short focal length of the first lens is useful for collecting light, and this arrangement with the full set of focal lengths of the optical lens allows as much light to enter the lens as possible.

In an exemplary embodiment, the combined focal length value F34 of the third lens and the fourth lens and the entire set of focal length values F of the optical lens may satisfy: F34/F is more than or equal to 1.0 and less than or equal to 2.0. More specifically, F34 and F further satisfy 1.2. ltoreq. F34/F. ltoreq.1.8, for example 1.41. ltoreq. F34/F. ltoreq.1.67. The configuration of the combined focal length value of the third lens and the fourth lens and the whole group focal length value of the optical lens can control the light trend between the second lens and the fifth lens, reduce the aberration caused by large-angle light passing through the second lens, and simultaneously make the lens compact in structure and beneficial to miniaturization.

In an exemplary embodiment, the focal length value F3 of the third lens and the focal length value F4 of the fourth lens may satisfy: the absolute value of F3/F4 is more than or equal to 0.4 and less than or equal to 1.3. More specifically, F3 and F4 can further satisfy 0.6 ≦ F3/F4 ≦ 1.1, e.g., 0.72 ≦ F3/F4 ≦ 0.98. The configuration that the focal length value of the third lens is close to that of the fourth lens facilitates smooth transition of light rays and improvement of image quality.

In an exemplary 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 may satisfy 0.4 ≦ R3/(R4+ d3) ≦ 1.4. More specifically, R3, R4 and d3 may further satisfy 0.6. ltoreq. R3/(R4+ d 3). ltoreq.1.2, for example 0.86. ltoreq. R3/(R4+ d 3). ltoreq.0.95. The special lens shape of the second lens is set, so that the peripheral light and the central light have optical path difference, the central light is diffused and enters the rear optical system, the aperture of the front end of the lens is reduced, the size is reduced, and the miniaturization and the cost reduction are facilitated.

In an exemplary embodiment, the radius of curvature R8 of the object-side surface of the fourth lens and the radius of curvature R9 of the image-side surface of the fourth lens may satisfy: the absolute value of R8/R9 is more than or equal to 1.0 and less than or equal to 1.8. More specifically, R8 and R9 can further satisfy 1.2 ≦ R8/R9 ≦ 1.6, e.g., 1.39 ≦ R8/R9 ≦ 1.55. The curvature radius of the object side surface of the fourth lens is close to the curvature radius of the image side surface of the fourth lens, so that light can smoothly enter and exit, and the resolution is improved.

In an exemplary embodiment, the thickness d6 of the third lens, the thickness d8 of the fourth lens, and the thickness d10 of the fifth lens may satisfy: max { dn/dm } ≦ 1.8, where n is 6, 8, or 10, and m is 6, 8, or 10. More specifically, d6, d8 and d10 may further satisfy max { dn/dm } ≦ 1.5, where n is 6, 8, or 10, and m is 6, 8, or 10, e.g., 1.08 ≦ max { dn/dm } ≦ 1.40. The thickness of the third lens, the thickness of the fourth lens and the thickness of the fifth lens are reasonably configured, so that the central thicknesses of the third lens and the fifth lens are close to each other, and the integral optical lens is beneficial to small light deflection change and good temperature performance under high and low temperatures.

In an exemplary embodiment, the Sg value SAG (S10) corresponding to the maximum clear aperture of the object-side surface of the fifth lens and the thickness d10 of the fifth lens may satisfy: arctan (SAG (S10)/d10) ≧ 45. More specifically, SAG and d10 further satisfy arctan (SAG (S10)/d10) ≧ 47, such as 49.41 ≦ arctan (SAG (S10)/d10) ≦ 54.59. The Sg value SAG (S10) corresponding to the maximum light-transmitting aperture of the object side surface of the fifth lens and the thickness d10 of the fifth lens are reasonably controlled, so that light can smoothly enter the fifth lens, and distortion is reduced.

In an exemplary embodiment, the entire set of focal length values F of the optical lens and the entrance pupil diameter ENPD of the optical lens system may satisfy F/ENPD ≦ 1.2. More specifically, F and ENPD may further satisfy F/ENPD ≦ 1.1, e.g., F/ENPD ≦ 1.0. The proportion of the F and the ENPD is reasonably controlled, namely the FNO of the lens is reasonably controlled, so that the FNO of the lens is smaller, the luminous flux of a system can be increased, and the image surface brightness is improved.

In an exemplary embodiment, the optical lens according to the present application may further include a filter disposed between the fifth lens and the image plane to filter light rays having different wavelengths, as needed; and may further include a protective glass disposed between the fifth lens (or the optical filter) and the image plane to prevent a chip of the lens and/or internal elements of the lens from being contaminated or damaged.

In an exemplary embodiment, the object side surface and the image side surface of the second lens and the fifth lens may be aspherical. The aspheric lens has the characteristics that: the curvature varies continuously from the center of the lens to the periphery. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has the 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.

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

Through the reasonable collocation to lens shape, focal power, sphere and aspheric surface, this application provides a little FNO camera lens, and it can realize the miniaturization of camera lens, when being convenient for assemble, has improved imaging quality and thermal stability. Meanwhile, through the use of a plurality of aspheric surfaces, aberration is effectively corrected, the resolving power can be improved, the optical system is compact as a whole, miniaturization is met, tolerance sensitivity is reduced, and assembly is facilitated. Thus, the optical lens according to the above-described embodiment of the present application can better meet the requirements of, for example, an in-vehicle application.

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 an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, and a fifth lens element L5.

The first lens L1 is a biconcave lens with negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens L2 is a lens with negative power, 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 power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 has positive refractive power, and has a convex object-side surface S10 and a concave image-side surface S11.

In the present embodiment, the object-side surface S3 and the image-side surface S4 of the second lens L2 and the object-side surface S10 and the image-side surface S11 of the fifth lens L5 are both aspheric.

Optionally, the optical lens may further include a filter and/or a protective glass L6 having an object side S12 and an image side S13. Filters may be used to correct for color deviations. The protective glass can be used for protecting the image sensing chip positioned on the imaging plane IMA. Light from the object passes through each of the surfaces S1 to S13 in sequence and is finally imaged on the imaging plane IMA.

In the optical lens of the present embodiment, a stop STO may be provided between the second lens L2 and the third lens L3 to improve the imaging quality.

Table 1 shows a curvature radius R, a thickness T/distance D, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 1.

TABLE 1

The present embodiment adopts five lenses as an example, and by reasonably distributing the focal power and the surface type of each lens, the center thickness of each lens and the air space between each lens, the lens can have at least one of the advantages of large aperture, miniaturization, small front end aperture, high resolution, low cost 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 respective high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S10 and S11 in example 1.

Flour mark

k

A

B

C

D

E

S3

-0.7496

-8.5480E-04

-8.5579E-05

3.2175E-06

-1.4390E-07

3.0744E-09

S4

-0.6450

-5.2324E-04

-1.2025E-04

3.7219E-06

-5.7166E-08

7.4710E-10

S10

-0.4208

1.4264E-04

1.2596E-05

-5.9941E-07

1.7766E-08

-1.8820E-10

S11

3.3462

8.4497E-04

-1.7790E-05

2.5044E-06

-1.5941E-08

-1.9270E-10

TABLE 2

Table 3 below gives the optical length TTL of the optical lens of embodiment 1 (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 of the optical lens to the center of the imaging surface IMA of the optical lens), the system entrance pupil diameter ENPD, the entire group focal length value F of the optical lens, the image height H corresponding to the maximum angle of view of the optical lens, the maximum angle of view FOV of the optical lens, the maximum clear diameter D of the object-side surface of the first lens corresponding to the maximum angle of view of the optical lens, the focal length value F1 of the first lens L1, the focal length value F2 of the second lens L2, the focal length value F3 of the third lens L3, the focal length F4 of the fourth lens L4, the focal length F5 of the fifth lens L5, the combined focal length F34 of the third lens L3 and the fourth lens L4, and the maximum clear diameter Sg S10 corresponding to the object-side surface S10 of the fifth lens L5 (SAG S32).

TTL(mm)	31.2368	F2(mm)	-63.4948
				ENPD(mm)	6.0125	F3(mm)	14.5754
F(mm)	6.0125	F4(mm)	19.9054
				H(mm)	7.3670	F5(mm)	37.5180
FOV(°)	78.8	F34(mm)	9.3725
				D(mm)	10.8652	Sag(S10)(mm)	3.3864
F1(mm)	-12.9923

TABLE 3

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 an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, and a fifth lens element L5.

Table 4 shows the radius of curvature R, thickness T/distance D, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 2.

TABLE 4

The conical coefficients k and the respective high-order term coefficients A, B, C, D and E which can be used for the aspherical lens surfaces S3, S4, S10 and S11 in example 2 are given in table 5 below.

Flour mark

k

A

B

C

D

E

S3

-0.7244

-8.3254E-04

-8.5364E-05

3.1956E-06

-1.5710E-07

3.5489E-09

S4

-0.7374

-6.6112E-04

-1.6538E-04

8.5713E-06

1.8996E-07

-6.3557E-09

S10

-0.4278

1.4100E-04

1.2615E-05

-5.9358E-07

1.8230E-08

-1.7300E-10

S11

3.3892

8.5339E-04

-1.7531E-05

2.4964E-06

-1.8518E-08

-5.2930E-10

TABLE 5

Table 6 below gives an optical length TTL of the optical lens of embodiment 2 (i.e., a distance on the optical axis from the center of the object-side surface S1 of the first lens L1 of the optical lens to the center of the imaging surface IMA of the optical lens), a system entrance pupil diameter ENPD, a full group focal length value F of the optical lens, an image height H corresponding to the maximum angle of view of the optical lens, the maximum angle of view FOV of the optical lens, a maximum clear diameter D of the object-side surface of the first lens corresponding to the maximum angle of view of the optical lens, a focal length value F1 of the first lens L1, a focal length value F2 of the second lens L2, a focal length value F3 of the third lens L3, a focal length F4 of the fourth lens L4, a focal length F5 of the fifth lens L5, a combined focal length F34 of the third lens L3 and the fourth lens L4, and a maximum clear aperture value Sg S596 (SAG 2) corresponding to the maximum clear aperture S596 of the object-side surface S10 of the fifth lens.

TTL(mm)	31.7196	F2(mm)	-70.4376
				ENPD(mm)	6.2000	F3(mm)	14.7542
F(mm)	6.2000	F4(mm)	20.0527
				H(mm)	7.7740	F5(mm)	38.3401
FOV(°)	78.8	F34(mm)	9.4395
				D(mm)	11.0005	Sag(S10)(mm)	3.6954
F1(mm)	-13.0972

TABLE 6

Example 3

An optical lens according to embodiment 3 of the present application is described below with reference to fig. 3. 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 an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, and a fifth lens element L5.

The first lens L1 is a biconcave lens with negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens L2 is a lens with negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens L3 is a lens with positive power, and has a concave object-side surface S6 and a convex image-side surface S7. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 has positive refractive power, and has a convex object-side surface S10 and a concave image-side surface S11.

Table 7 shows the radius of curvature R, thickness T/distance D, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 3.

TABLE 7

The conical coefficients k and the respective high-order term coefficients A, B, C, D and E which can be used for the aspherical lens surfaces S3, S4, S10 and S11 in example 3 are given in table 8 below.

Flour mark

k

A

B

C

D

E

S3

-0.5844

-7.6986E-04

-5.9128E-05

2.2642E-06

-1.6537E-07

3.7535E-09

S4

-0.4723

-2.3527E-04

-1.1252E-04

5.2072E-06

-2.6907E-07

6.0448E-09

S10

-0.5644

1.0689E-04

1.3586E-05

-5.3609E-07

1.2948E-08

-1.0930E-10

S11

3.0337

6.6223E-04

-2.2821E-06

2.4675E-06

-8.5379E-08

2.7380E-09

TABLE 8

Table 9 below gives the optical length TTL of the optical lens of embodiment 3 (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 of the optical lens to the center of the imaging surface IMA of the optical lens), the system entrance pupil diameter ENPD, the entire group focal length value F of the optical lens, the image height H corresponding to the maximum angle of view of the optical lens, the maximum angle of view FOV of the optical lens, the maximum clear diameter D of the object-side surface of the first lens corresponding to the maximum angle of view of the optical lens, the focal length value F1 of the first lens L1, the focal length value F2 of the second lens L2, the focal length value F3 of the third lens L3, the focal length F4 of the fourth lens L4, the focal length F5 of the fifth lens L5, the combined focal length F34 of the third lens L3 and the fourth lens L4, and the maximum clear diameter Sg S10 corresponding to the object-side surface S10 of the fifth lens L5 (SAG S10).

TTL(mm)	32.0001	F2(mm)	-126.3625
				ENPD(mm)	5.9400	F3(mm)	17.8481
F(mm)	5.9400	F4(mm)	18.2916
				H(mm)	7.2260	F5(mm)	37.2632
FOV(°)	78.8	F34(mm)	9.9047
				D(mm)	11.0004	Sag(S10)(mm)	3.6931
F1(mm)	-12.4369

TABLE 9

Example 4

An optical lens according to embodiment 4 of the present application is described below with reference to fig. 4. Fig. 4 shows a schematic structural diagram of an optical lens according to embodiment 4 of the present application.

As shown in fig. 4, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, and a fifth lens element L5.

Table 10 shows the radius of curvature R, thickness T/distance D, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 4.

Watch 10

The conical coefficients k and the respective high-order term coefficients A, B, C, D and E which can be used for the aspherical lens surfaces S3, S4, S10 and S11 in example 4 are given in table 11 below.

TABLE 11

Table 12 below gives the optical length TTL of the optical lens of example 4 (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 of the optical lens to the center of the imaging surface IMA of the optical lens), the system entrance pupil diameter ENPD, the entire group focal length value F of the optical lens, the image height H corresponding to the maximum angle of view of the optical lens, the maximum angle of view FOV of the optical lens, the maximum clear diameter D of the object-side surface of the first lens corresponding to the maximum angle of view of the optical lens, the focal length value F1 of the first lens L1, the focal length value F2 of the second lens L2, the focal length value F3 of the third lens L3, the focal length F4 of the fourth lens L4, the focal length F5 of the fifth lens L5, the combined focal length F34 of the third lens L3 and the fourth lens L4, and the maximum clear diameter Sg S10 corresponding to the object-side surface S10 of the fifth lens L5 (SAG S10).

TTL(mm)	31.7172	F2(mm)	-168.3347
				ENPD(mm)	6.1467	F3(mm)	18.0413
F(mm)	6.1467	F4(mm)	18.4035
				H(mm)	7.4500	F5(mm)	38.0160
FOV(°)	78.8	F34(mm)	9.9544
				D(mm)	11.3892	Sag(S10)(mm)	3.8673
F1(mm)	-12.5038

TABLE 12

Example 5

An optical lens according to embodiment 5 of the present application is described below with reference to fig. 5. Fig. 5 shows a schematic structural diagram of an optical lens according to embodiment 5 of the present application.

As shown in fig. 5, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, and a fifth lens element L5.

The first lens element L1 has a negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a lens with negative power, 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 power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 has positive refractive power, and has a convex object-side surface S10 and a concave image-side surface S11.

Table 13 shows the radius of curvature R, thickness T/distance D, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 5.

Watch 13

The following table 14 shows the conic coefficients k and the respective high-order term coefficients A, B, C, D and E which can be used for the aspherical lens surfaces S3, S4, S10 and S11 in example 5.

Flour mark

k

A

B

C

D

E

S3

-0.4813

-5.2076E-04

-9.7097E-05

3.1278E-06

-1.1898E-07

1.7834E-09

S4

-0.5279

-2.2381E-04

-9.7922E-05

1.6126E-06

-1.4932E-07

-3.9530E-10

S10

-0.2515

1.6749E-04

1.3751E-05

-5.3544E-07

1.7774E-08

-2.2680E-10

S11

2.5488

6.1903E-04

-6.9950E-06

2.8690E-06

-6.7224E-09

-1.9356E-09

TABLE 14

Table 15 below gives the optical length TTL of the optical lens of example 5 (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 of the optical lens to the center of the imaging surface IMA of the optical lens), the system entrance pupil diameter ENPD, the entire group focal length value F of the optical lens, the image height H corresponding to the maximum angle of view of the optical lens, the maximum angle of view FOV of the optical lens, the maximum clear diameter D of the object-side surface of the first lens corresponding to the maximum angle of view of the optical lens, the focal length value F1 of the first lens L1, the focal length value F2 of the second lens L2, the focal length value F3 of the third lens L3, the focal length F4 of the fourth lens L4, the focal length F5 of the fifth lens L5, the combined focal length F34 of the third lens L3 and the fourth lens L4, and the maximum clear diameter Sg S10 corresponding to the object-side surface S10 of the fifth lens L5 (SAG S10).

Watch 15

Example 6

An optical lens according to embodiment 6 of the present application is described below with reference to fig. 6. Fig. 6 shows a schematic structural diagram of an optical lens according to embodiment 6 of the present application.

As shown in fig. 6, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, and a fifth lens element L5.

Table 16 shows the radius of curvature R, thickness T/distance D, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 6.

TABLE 16

The conical coefficients k and the respective high-order term coefficients A, B, C, D and E which can be used for the aspherical lens surfaces S3, S4, S10 and S11 in example 6 are given in table 17 below.

Flour mark

k

A

B

C

D

E

S3

-0.4814

-5.2081E-04

-9.6585E-05

3.1280E-06

-1.1953E-07

1.7854E-09

S4

-0.5280

-2.2372E-04

-9.7783E-05

1.6148E-06

-1.4931E-07

-3.9530E-10

S10

-0.2215

1.8719E-04

1.3752E-05

-5.3250E-07

1.7576E-08

-2.4760E-10

S11

2.1148

6.0983E-04

-5.4724E-06

3.0036E-06

-3.5317E-09

-1.8383E-09

TABLE 17

Table 18 below gives an optical length TTL of the optical lens of example 6 (i.e., a distance on the optical axis from the center of the object-side surface S1 of the first lens L1 of the optical lens to the center of the imaging surface IMA of the optical lens), a system entrance pupil diameter ENPD, a full group focal length value F of the optical lens, an image height H corresponding to the maximum angle of view of the optical lens, the maximum angle of view FOV of the optical lens, a maximum clear diameter D of the object-side surface of the first lens corresponding to the maximum angle of view of the optical lens, a focal length value F1 of the first lens L1, a focal length value F2 of the second lens L2, a focal length value F3 of the third lens L3, a focal length F4 of the fourth lens L4, a focal length F5 of the fifth lens L5, a combined focal length F34 of the third lens L3 and the fourth lens L4, and a maximum clear aperture value Sg S10 corresponding to the object-side surface S10 of the fifth lens L5 (SAG S10).

TTL(mm)	28.3360	F2(mm)	-57.5562
				ENPD(mm)	6.1500	F3(mm)	13.9551
F(mm)	6.1500	F4(mm)	19.3999
				H(mm)	7.5540	F5(mm)	34.1745
FOV(°)	78.8	F34(mm)	8.7906
				D(mm)	12.1384	Sag(S10)(mm)	3.5467
F1(mm)	-14.6897	Nd1	1.8500

Watch 18

Example 7

An optical lens according to embodiment 7 of the present application is described below with reference to fig. 7. Fig. 7 shows a schematic structural diagram of an optical lens according to embodiment 7 of the present application.

As shown in fig. 7, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, and a fifth lens element L5.

The first lens element L1 has a negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a lens with negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens L3 is a lens with positive power, and has a concave object-side surface S6 and a convex image-side surface S7. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 has positive refractive power, and has a convex object-side surface S10 and a concave image-side surface S11.

Table 19 shows the radius of curvature R, thickness T/distance D, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 7.

Watch 19

The following table 20 shows the conic coefficients k and the respective high-order term coefficients A, B, C, D and E which can be used for the aspherical lens surfaces S3, S4, S10 and S11 in example 7.

Flour mark

k

A

B

C

D

E

S3

-0.4951

-5.6682E-04

-9.1315E-05

2.6062E-06

-1.4363E-07

2.9476E-09

S4

-0.5862

-2.5185E-04

-1.3535E-04

-1.0994E-06

-1.1424E-09

3.1285E-09

S10

-0.4783

1.2814E-04

1.2277E-05

-5.7825E-07

1.7167E-08

-1.2030E-10

S11

2.1254

5.8828E-04

-6.3770E-06

1.7742E-06

-1.9212E-08

-8.7630E-10

Watch 20

Table 21 below gives the optical length TTL of the optical lens of example 7 (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 of the optical lens to the center of the imaging surface IMA of the optical lens), the system entrance pupil diameter ENPD, the entire group focal length value F of the optical lens, the image height H corresponding to the maximum angle of view of the optical lens, the maximum angle of view FOV of the optical lens, the maximum clear diameter D of the object-side surface of the first lens corresponding to the maximum angle of view of the optical lens, the focal length value F1 of the first lens L1, the focal length value F2 of the second lens L2, the focal length value F3 of the third lens L3, the focal length F4 of the fourth lens L4, the focal length F5 of the fifth lens L5, the combined focal length F34 of the third lens L3 and the fourth lens L4, and the maximum clear diameter Sg S10 corresponding to the object-side surface S10 of the fifth lens L5 (SAG S10).

TTL(mm)	30.3086	F2(mm)	-92.0478
				ENPD(mm)	6.1454	F3(mm)	16.0635
F(mm)	6.1454	F4(mm)	18.4420
				H(mm)	7.3160	F5(mm)	41.3175
FOV(°)	78.8	F34(mm)	9.1874
				D(mm)	12.5845	Sag(S10)(mm)	3.7012
F1(mm)	-15.2914	Nd1	1.8500

TABLE 21

Example 8

An optical lens according to embodiment 8 of the present application is described below with reference to fig. 8. Fig. 8 shows a schematic structural diagram of an optical lens according to embodiment 8 of the present application.

As shown in fig. 8, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, and a fifth lens element L5.

Table 22 shows the radius of curvature R, thickness T/distance D, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 8.

TABLE 22

The following table 23 shows the conic coefficients k and the respective high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S10 and S11 in example 8.

Flour mark

k

A

B

C

D

E

S3

-0.4925

-5.6428E-04

-9.1046E-05

2.6336E-06

-1.4129E-07

3.1222E-09

S4

-0.5908

-2.6101E-04

-1.3630E-04

-1.1549E-06

-4.8248E-09

2.8679E-09

S10

-0.4803

1.2771E-04

1.2264E-05

-5.7736E-07

1.7184E-08

-1.2000E-10

S11

2.1248

5.8853E-04

-6.3979E-06

1.7713E-06

-1.9406E-08

-8.8660E-10

TABLE 23

Table 24 below gives the optical length TTL of the optical lens of example 8 (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 of the optical lens to the center of the imaging surface IMA of the optical lens), the system entrance pupil diameter ENPD, the entire group focal length value F of the optical lens, the image height H corresponding to the maximum angle of view of the optical lens, the maximum angle of view FOV of the optical lens, the maximum clear diameter D of the object-side surface of the first lens corresponding to the maximum angle of view of the optical lens, the focal length value F1 of the first lens L1, the focal length value F2 of the second lens L2, the focal length value F3 of the third lens L3, the focal length F4 of the fourth lens L4, the focal length F5 of the fifth lens L5, the combined focal length F34 of the third lens L3 and the fourth lens L4, and the maximum clear diameter Sg S10 corresponding to the object-side surface S10 of the fifth lens L5 (SAG S10).

Watch 24

In summary, examples 1 to 8 each satisfy the relationship shown in table 25 below.

Conditional expression (A) example	E1	E2	E3	E4	E5	E6	E7	E8
									TTL/F	5.1953	5.1161	5.3872	5.1600	4.5444	4.6075	4.9319	4.9061
TTL/H/FOV	0.0538	0.0518	0.0562	0.0540	0.0468	0.0476	0.0526	0.0526
									D/H/FOV	0.0187	0.0180	0.0193	0.0194	0.0201	0.0204	0.0218	0.0226
\|F1/F\|	2.1609	2.1125	2.0938	2.0342	2.3962	2.3886	2.4883	2.6515
									F34/F	1.5588	1.5225	1.6675	1.6195	1.4112	1.4294	1.4950	1.4948
F3/F4	0.7322	0.7358	0.9758	0.9803	0.7188	0.7193	0.8710	0.8707
									R3/(R4+d3)	0.9473	0.9329	0.9070	0.8825	0.9128	0.9134	0.8615	0.8618
\|R8/R9\|	1.4816	1.4488	1.5534	1.3877	1.4241	1.4241	1.5332	1.5344
									max{dn/dm}	1.1842	1.1629	1.3115	1.3136	1.3898	1.3973	1.0843	1.0839
arctan(SAG/d)	49.9889	52.8218	49.4060	50.9296	54.4569	53.8189	54.5939	54.4714
									F/ENPD	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0

TABLE 25

The present application also provides an imaging apparatus that may include the optical lens according to the above-described embodiment of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The imaging element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device or an imaging module integrated on other known devices. The imaging device is equipped with the optical lens described above.

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. 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,

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

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 image side surface of the third lens is a convex surface;

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

the fifth lens has positive focal power, and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface.

2. The optical lens of claim 1, wherein the total optical length TTL of the optical lens and the entire set of focal length values F of the optical lens satisfy TTL/F ≦ 5.8.

3. The optical lens of claim 1, wherein the maximum field angle FOV of the optical lens, the total optical length TTL of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens satisfy TTL/H/FOV ≦ 0.1.

4. The optical lens according to claim 1, wherein the maximum field angle FOV of the optical lens, the maximum clear diameter D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens satisfy D/H/FOV ≦ 0.035.

5. An optical lens according to claim 1, wherein the focal length value F1 of the first lens and the entire set of focal length values F of the optical lens satisfy | F1/F | ≦ 3.5.

6. An optical lens according to claim 1, characterized in that a combined focal length value F34 of the third lens and the fourth lens and a whole group focal length value F of the optical lens satisfy 1.0 ≦ F34/F ≦ 2.0.

7. The optical lens of claim 1, wherein a focal length value F3 of the third lens and a focal length value F4 of the fourth lens satisfy 0.4 ≦ F3/F4| ≦ 1.3.

8. An optical lens according to claim 1, characterized in that a radius of curvature R3 of an object-side surface of the second lens, a radius of curvature R4 of an image-side surface of the second lens, and a center thickness d3 of the second lens satisfy 0.4 ≦ R3/(R4+ d3) ≦ 1.4.

9. 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,

the first lens has a negative optical power;

the third lens has positive optical power;

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

the whole group of focal length values F of the optical lens and the entrance pupil diameter ENPD of the optical lens system meet the condition that F/ENPD is less than or equal to 1.2.

10. An imaging apparatus comprising the optical lens of claim 1 or 9 and an imaging element for converting an optical image formed by the optical lens into an electric signal.