CN107329235B

CN107329235B - Imaging lens

Info

Publication number: CN107329235B
Application number: CN201710637489.7A
Authority: CN
Inventors: 黄林
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2017-07-31
Filing date: 2017-07-31
Publication date: 2022-11-22
Anticipated expiration: 2037-07-31
Also published as: CN107329235A

Abstract

The application discloses an imaging lens, in order from an object side to an image side: a first lens having a positive optical power; a second lens having a focal power, wherein the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; the image side surface of the third lens is a convex surface; a fourth lens having optical power; a fifth lens having a refractive power, an object-side surface of which is convex; wherein 5.5-less & lt f1/f & lt 25 & gt is satisfied between the effective focal length f of the imaging lens and the effective focal length f1 of the first lens. The imaging lens of this application adopts 5 lenses, has characteristics of large aperture, high relative brightness, wide-angle, good imaging quality.

Description

Imaging lens

Technical Field

The invention relates to an imaging lens, in particular to a large-aperture imaging lens consisting of five lenses.

Background

The development of modern optical systems, in addition to high resolution, is constantly moving towards large fields of view and large apertures. Since a large field of view and a large aperture can contain more object information. Therefore, a camera lens with a large field of view and a large aperture has become a trend.

At present, due to the increasing development of portable electronic products, further higher requirements are put forward on the performances of a camera lens, such as large field of view, large aperture, high relative brightness, imaging quality and the like. In order to meet the requirements of compact structure and high relative brightness, the F number of the conventional lens is usually 2.0 or more than 2.0, so that the lens has compact structure and good optical performance. However, with the continuous development of portable electronic products such as smartphones, higher requirements are put forward on imaging lenses, especially for situations such as insufficient light (e.g., rainy days, dusk, etc.) and shaking hands, so that F number of 2.0 or more than 2.0 cannot meet higher-order imaging requirements.

Therefore, the invention provides an optical system which is applicable to portable electronic products, has large aperture, high relative brightness, wide angle, good imaging quality and low sensitivity.

Disclosure of Invention

To solve at least some problems in the prior art, the present invention provides an imaging lens.

One aspect of the present invention provides an imaging lens, in order from an object side to an image side, comprising: a first lens having a positive optical power; a second lens having a focal power, the object-side surface of the second lens being convex, and the image-side surface of the second lens being concave; a third lens with positive focal power, wherein the image side surface of the third lens is a convex surface; a fourth lens having a focal power; a fifth lens having a refractive power, an object-side surface of which is convex; wherein, the effective focal length f of the imaging lens and the effective focal length f1 of the first lens meet 5.5-t & ltf 1/f & lt 25.

According to an embodiment of the invention, f/EPD is less than or equal to 1.6 between the effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens.

According to one embodiment of the invention, 1.8-woven fabric DT11/DT52<2.8 is satisfied between the effective radius DT11 of the object-side surface of the first lens and the effective radius DT52 of the image-side surface of the fifth lens.

According to an embodiment of the present invention, 1.3-straw dt11/ImgH <3 is satisfied between the effective radius DT11 of the object-side surface of the first lens and half ImgH of the diagonal length of the effective pixel area on the imaging surface.

According to an embodiment of the present invention, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the imaging lens satisfy-3.5-f12/f < -2.6.

According to an embodiment of the present invention, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R6 of the image-side surface of the third lens satisfy-1.2-straw R3/R6-0.5.

According to an embodiment of the present invention, at least one of the object-side surface and the image-side surface of the first lens element has at least one inflection point.

According to an embodiment of the invention, imgH/f is equal to or greater than 1.1 between half of the diagonal length ImgH of the effective pixel area on the imaging surface and the effective focal length f of the imaging lens.

According to an embodiment of the present invention, 1.5-t/f 3<8 between the effective focal length f1 of the first lens and the effective focal length f3 of the third lens is satisfied.

According to an embodiment of the invention, an effective focal length f3 of the third lens and an effective focal length f of the imaging lens satisfy 1.4 ≦ f3/f <3.8.

According to one embodiment of the present invention, 2-straw dt11/DT21<3.4 is satisfied between the effective radius DT11 of the object-side surface of the first lens and the effective radius DT21 of the object-side surface of the second lens.

According to an embodiment of the present invention, the effective focal length f5 of the fifth lens element and the effective focal length f of the imaging lens satisfy | f/f5 | 0.2.

According to an embodiment of the present invention, an infrared band pass filter is disposed between the fifth lens element and the image plane.

According to an embodiment of the invention, a diaphragm is arranged between the second lens and the third lens.

Another aspect of the present invention provides an imaging lens, in order from an object side to an image side: a first lens having a positive optical power; a second lens having a focal power, wherein the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; the image side surface of the third lens is a convex surface; a fourth lens having an optical power; a fifth lens having a refractive power, an object-side surface of which is convex; the lens is characterized in that the effective radius DT11 of the object side surface of the first lens and the half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy 1.3-straw DT11/ImgH <3.

According to an embodiment of the invention, 5.5-foot cover f1/f <25 is satisfied between the effective focal length f of the imaging lens and the effective focal length f1 of the first lens.

According to an embodiment of the present invention, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the imaging lens satisfy-3.5 < -12/f < -2.6.

Another aspect of the present invention provides an imaging lens, in order from an object side to an image side: a first lens having a positive optical power; a second lens having a focal power, wherein the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; the image side surface of the third lens is a convex surface; a fourth lens having a focal power; a fifth lens having a refractive power, an object-side surface of which is convex; the lens is characterized in that 1.8-through DT11/DT52<2.8 is satisfied between the effective radius DT11 of the object side surface of the first lens and the effective radius DT52 of the image side surface of the fifth lens.

Another aspect of the present invention provides an imaging lens, in order from an object side to an image side: a first lens having a positive optical power; a second lens having a focal power, wherein the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; the image side surface of the third lens is a convex surface; a fourth lens having an optical power; a fifth lens having a refractive power, an object-side surface of which is convex; the focusing lens is characterized in that the combined focal length f12 of the first lens and the second lens and the effective focal length f of the imaging lens meet-3.5 and are woven into a fabric of f12/f < -2.6.

Another aspect of the present invention provides an imaging lens, in order from an object side to an image side: a first lens having a positive optical power; a second lens having a focal power, wherein the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; a third lens with positive focal power, wherein the image side surface of the third lens is a convex surface; a fourth lens having an optical power; a fifth lens having a refractive power, an object-side surface of which is convex; the lens is characterized in that the effective radius DT11 of the object side surface of the first lens and the effective radius DT21 of the object side surface of the second lens meet the requirement that 2-straw DT11/DT21<3.4.

Another aspect of the present invention provides an imaging lens, in order from an object side to an image side: a first lens having a positive optical power; a second lens having a focal power, wherein the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; a third lens with positive focal power, wherein the image side surface of the third lens is a convex surface; a fourth lens having an optical power; a fifth lens having a refractive power, an object-side surface of which is convex; wherein an effective focal length f5 of the fifth lens element and an effective focal length f of the imaging lens assembly satisfy | f/f5 | 0.2.

The imaging lens provided by the invention adopts 5 lenses, and has at least one of the characteristics of large aperture, high relative brightness, wide angle and good imaging quality.

Drawings

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

fig. 1 shows a schematic configuration diagram of an imaging lens of embodiment 1;

fig. 2 to 5 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the imaging lens of embodiment 1;

fig. 6 is a schematic structural view showing an imaging lens of embodiment 2;

fig. 7 to 10 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the imaging lens of embodiment 2;

fig. 11 is a schematic structural view showing an imaging lens of embodiment 3;

fig. 12 to 15 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of an imaging lens of embodiment 3;

fig. 16 is a schematic structural view showing an imaging lens of embodiment 4;

fig. 17 to 20 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of an imaging lens of embodiment 4;

fig. 21 is a schematic structural view showing an imaging lens of embodiment 5;

fig. 22 to 25 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of an imaging lens of embodiment 5;

fig. 26 is a schematic structural view showing an imaging lens of embodiment 6; and

fig. 27 to 30 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the imaging lens of embodiment 6.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings.

It will be understood that when an element or layer is referred to herein as being "on," "connected to" or "coupled to" another element or layer, it can be directly on, connected or coupled to the other element or layer or intervening elements or layers may be present. When an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. Like numbers refer to like elements throughout the specification. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood that, although the terms 1, 2 or first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, a feature that does not define a singular or plural form is also intended to include a feature of the plural form unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "having," "contains" and/or "containing," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. A statement such as "at least one of" when appearing after a list of elements modifies the entire list of elements rather than modifying individual elements within 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, in the present application, the embodiments and features of the embodiments 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 application provides an imaging lens. The imaging lens according to the present application is provided with, in order from an object side to an image side of the imaging lens: the lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens.

In the embodiment of the present application, f/EPD is satisfied to be equal to or less than 1.6 between the effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens, and 5.5-but f1/f <25 is satisfied to be equal to or less than 5.82 and equal to or less than f1/f and equal to or less than 12.05 is satisfied to be between the effective focal length f of the imaging lens and the effective focal length f1 of the first lens. The imaging lens meeting the relation can realize the effects of wide angle, large aperture, high relative illumination and high resolution.

In the embodiment of the present application, 1.8-and-a-straw dt11/DT52<2.8, more specifically, 1.86 ≦ DT11/DT52 ≦ 2.75 is satisfied between the effective radius DT11 of the object-side surface of the first lens and the effective radius DT52 of the image-side surface of the fifth lens. The imaging lens meeting the relation can realize the effects of wide angle and high relative illumination.

In the embodiment of the present application, 1.3-straw DT11/ImgH <3 is satisfied between the effective radius DT11 of the object-side surface of the first lens and half ImgH of the diagonal length of the effective pixel region on the imaging plane, and more specifically, 1.31. Ltoreq. DT 11/ImgH. Ltoreq.2.89 is satisfied. The imaging lens meeting the relation can realize the effects of wide angle and high relative illumination.

In the embodiment of the present application, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the imaging lens satisfy-3.5-f 12/f < -2.6, more specifically, satisfy-3.4 ≦ f12/f ≦ -2.48. The imaging lens satisfying the above relationship can achieve a wide-angle effect.

In the embodiment of the present application, the radii of curvature R3 of the object-side surfaces of the second lenses and R6 of the image-side surfaces of the third lenses satisfy-1.2 s of R3/R6< -0.5, more specifically, satisfy-1.1. Ltoreq. R3/R6. Ltoreq.0.6. The imaging lens meeting the relation can realize the effects of large aperture and high image quality.

In the embodiment of the present application, 1.5-f 1/f3<8, more specifically, 1.6 ≦ f1/f3 ≦ 5.02 is satisfied between the effective focal length f1 of the first lens and the effective focal length f3 of the third lens. The imaging lens satisfying the above relationship can realize a wide angle and a high pixel efficiency.

In the embodiment of the application, imgH/f is more than or equal to 1.1, more specifically, imgH/f is more than or equal to 1.11, between the half of the diagonal length of the effective pixel area on the imaging surface and the effective focal length f of the imaging lens. The imaging lens satisfying the above relationship can achieve a wide angle effect.

In the embodiment of the present application, 1.4. Ltoreq. F3/f <3.8, more specifically, 1.42. Ltoreq. F3/f. Ltoreq.3.63 is satisfied between the effective focal length f3 of the third lens and the effective focal length f of the imaging lens. The imaging lens satisfying the above relationship can realize high image quality and wide-angle effect.

In the embodiment of the present application, 2-over-DT11/DT 21<3.4, more specifically, 2.06 ≦ DT11/DT21 ≦ 3.28 is satisfied between the effective radius DT11 of the object-side surface of the first lens and the effective radius DT21 of the object-side surface of the second lens. The imaging lens satisfying the above relationship can achieve a wide angle effect.

In the embodiment of the present application, the effective focal length f5 of the fifth lens element and the effective focal length f of the imaging lens satisfy | f/f5 | <0.2, and more particularly satisfy | f/f5 | < 0.18. The imaging lens satisfying the above relationship can realize a high relative illumination effect.

In an embodiment of the present application, an infrared band pass filter is disposed between the fifth lens element and the imaging surface. The infrared band is beneficial to the system to control the diameter of the diffuse spot without introducing chromatic aberration, and simultaneously, the infrared band is beneficial to reducing the interference of the visible light of the environment and improving the signal-to-noise ratio of the output signal of the image sensor.

In the embodiments of the present application, at least one of the object-side surface and the image-side surface of the first lens element has at least one inflection point, which is advantageous for reducing distortion.

The imaging lens according to embodiment 1 to embodiment 6 of the present application includes 5 lenses. The 5 lenses are a first lens E1 having an object-side surface S1 and an image-side surface S2, a second lens E2 having an object-side surface S3 and an image-side surface S4, a third lens E3 having an object-side surface S5 and an image-side surface S6, a fourth lens E4 having an object-side surface S7 and an image-side surface S8, and a fifth lens E5 having an object-side surface S9 and an image-side surface S10, respectively. The first lens E1 to the fifth lens E5 are disposed in order from the object side to the image side of the imaging lens. The first lens element E1 may have positive refractive power, and at least one of the object-side surface and the image-side surface thereof has at least one inflection point; the second lens element E2 has negative focal power, and has a convex object-side surface S3 and a concave image-side surface S4; the third lens element E3 may have positive refractive power, and the image-side surface S6 thereof is convex; the fourth lens E4 may have a positive optical power; the fifth lens may have a positive power or a negative power. The imaging lens further comprises a filter E6 which is used for filtering infrared light and provided with an object side surface S11 and an image side surface S12. The imaging lens further includes a stop between the second lens E2 and the third lens E3. In the embodiment, light from the object passes through the respective surfaces S1 to S12 in sequence and is finally imaged on the imaging surface S13.

Parameter \ embodiment	Example 1	Example 2	Example 3	Example 4	Example 5	Example 6
							ImgH(mm)	2.47	2.47	2.47	2.47	2.47	3.01
HFOV(°)	56.23	55.36	51.31	54.55	53.47	51.19
							f(mm)	2.20	2.18	1.99	2.19	2.12	2.71
f1(mm)	15.67	13.64	24.01	12.74	13.87	18.40
							f2(mm)	-5.38	-4.21	-5.54	-4.50	-4.29	-5.48
f3(mm)	3.13	6.55	6.16	7.95	6.18	7.86
							f4(mm)	11.72	4.39	4.12	3.65	4.22	4.93
f5(mm)	12.49	18.55	-94.74	630.30	12.67	34.51
							TTL(mm)	7.67	8.50	10.49	9.08	8.14	10.71

TABLE 1

In the embodiment of the present application, the first lens E1 to the fifth lens E5 have respective effective focal lengths f1 to f5. The first lens E1 to the fifth lens E5 are arranged in order along the optical axis and together determine the total effective focal length f of the imaging lens. The effective focal lengths f1 to f5 of the first lens E1 to the fifth lens E5, the total effective focal length f of the imaging lens, the total length TTL of the imaging lens, half of the maximum field angle HFOV of the imaging lens, and half of the diagonal length ImgH of the effective pixel area on the imaging plane in embodiments 1 to 5 can be, for example, as shown in table 1 above.

The present application is further described below with reference to specific examples.

Example 1

Fig. 1 is a schematic diagram showing the structure of an imaging lens of embodiment 1. As described above and with reference to fig. 1, the imaging lens according to embodiment 1 includes 5 lenses. The 5 lenses are a first lens E1 having an object-side surface S1 and an image-side surface S2, a second lens E2 having an object-side surface S3 and an image-side surface S4, a third lens E3 having an object-side surface S5 and an image-side surface S6, a fourth lens E4 having an object-side surface S7 and an image-side surface S8, and a fifth lens E5 having an object-side surface S9 and an image-side surface S10, respectively.

Table 2 shows the surface type, radius of curvature, thickness, refractive index, dispersion coefficient, and conic coefficient of each lens in the imaging lens in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 2

In the present embodiment, each aspherical surface type x is defined by the following formula (1):

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex 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 =1/R (i.e., paraxial curvature c is the reciprocal of the radius of curvature R in table 2 above); k is the conic coefficient (given in table 2); ai is the correction coefficient of the i-th order of the aspherical surface. Table 3 below shows the high-order term coefficients A of the aspherical surfaces S1 to S10 of the aspherical lenses usable in this embodiment ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ And A ₁₆ 。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.9089E-02

4.8674E-01

-4.6896E+00

2.5620E+01

-8.6729E+01

1.8321E+02

-2.3553E+02

S2

-1.0662E-02

2.0801E-02

-2.8151E+00

2.1883E+01

-1.0415E+02

3.0157E+02

-5.2395E+02

S3

-2.6526E-01

3.2853E-01

-5.3928E+00

4.0465E+01

-1.9272E+02

5.7966E+02

-1.0628E+03

S4

-1.8173E-02

-2.2361E-01

2.3298E+00

-1.5195E+01

6.5109E+01

-1.6769E+02

2.5812E+02

S5

-8.7746E-02

2.3830E-02

9.9586E-01

-7.8194E+00

3.3087E+01

-7.9110E+01

1.1006E+02

S6

-2.3238E-01

6.3312E-01

-1.5467E+00

3.6129E+00

-6.1881E+00

7.2066E+00

-5.1493E+00

S7

-5.8897E-01

6.0048E-01

-3.9682E-01

2.0766E-01

-8.2185E-02

2.2711E-02

-4.0942E-03

S8

-3.0468E-01

3.1884E-01

-2.4608E-01

1.3565E-01

-5.1678E-02

1.3066E-02

-2.0669E-03

S9

-3.0468E-01

3.1884E-01

-2.4608E-01

1.3565E-01

-5.1678E-02

1.3066E-02

-2.0669E-03

S10

-3.0468E-01

3.1884E-01

-2.4608E-01

1.3565E-01

-5.1678E-02

1.3066E-02

-2.0669E-03

TABLE 3

Fig. 2 shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which represents the convergent focus deviation of light rays of different wavelengths after passing through an optical system. Fig. 3 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 1. Fig. 4 shows distortion curves of the imaging lens of embodiment 1, which represent distortion magnitude values in the case of different angles of view. Fig. 5 shows a relative illuminance curve of the imaging lens of embodiment 1, which represents the peripheral picture light to center picture light ratio, reflecting the picture light uniformity. In summary, as can be seen by referring to fig. 2 to 5, the imaging lens according to embodiment 1 is an imaging lens with a large aperture, high relative brightness, wide angle, and good imaging quality.

Example 2

Fig. 6 is a schematic diagram showing the structure of an imaging lens of embodiment 2. With reference to fig. 6 and as described above, the imaging lens according to embodiment 2 includes, in order from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5.

Table 4 shows the surface type, radius of curvature, thickness, refractive index, dispersion coefficient, and conic coefficient of each lens in the imaging lens in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 4

Table 5 below shows the high-order term coefficients A of the respective aspherical surfaces S1 to S10 usable for the respective aspherical lenses in this embodiment ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ And A ₁₆ . Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.3444E-02

-2.1683E-03

2.6176E-04

-2.0196E-05

9.4504E-07

-2.4285E-08

2.6692E-10

S2

1.4391E-02

-3.1393E-03

5.7988E-04

-7.1213E-05

5.2216E-06

-2.0165E-07

3.1301E-09

S3

3.3415E-02

-6.8953E-02

5.2354E-02

-2.3181E-02

5.9166E-03

-8.1041E-04

4.5750E-05

S4

-1.4153E-01

2.4727E-01

-4.6011E-01

6.1033E-01

-4.9301E-01

2.1376E-01

-3.7935E-02

S5

-1.1570E-03

-5.7705E-03

3.3514E-03

-1.5279E-03

4.0230E-04

-4.4255E-05

3.2768E-07

S6

-4.2088E-02

1.4316E-02

-6.5834E-03

1.8045E-03

-2.6685E-04

7.5067E-06

1.7583E-06

S7

-1.5253E-02

1.1563E-02

-5.6169E-03

1.6007E-03

-2.5882E-04

2.1654E-05

-7.2460E-07

S8

-4.0492E-02

2.3683E-02

-8.3671E-03

1.9269E-03

-2.5104E-04

1.5829E-05

-3.4332E-07

S9

-7.6142E-02

1.5510E-02

-1.0099E-02

4.3318E-03

-9.0325E-04

9.2739E-05

-3.8153E-06

S10

8.3394E-03

-3.1734E-02

1.5169E-02

-4.1147E-03

6.6814E-04

-5.8466E-05

2.0611E-06

TABLE 5

Fig. 7 shows on-axis chromatic aberration curves of the imaging lens of embodiment 2, which represent the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical system. Fig. 8 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 2. Fig. 9 shows distortion curves of the imaging lens of embodiment 2, which represent distortion magnitude values in the case of different angles of view. Fig. 10 shows a relative illuminance curve of the imaging lens of example 2, which represents the peripheral picture light to center picture light ratio, reflecting the picture light uniformity. In summary, as can be seen with reference to fig. 7 to 10, the imaging lens according to embodiment 2 is an imaging lens with a large aperture, high relative brightness, a wide angle, and good imaging quality.

Example 3

Fig. 11 is a schematic diagram showing the structure of an imaging lens of embodiment 3. Referring to fig. 11 and according to the description above, the imaging lens includes, in order from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5.

Table 6 shows the surface type, radius of curvature, thickness, refractive index, dispersion coefficient, and conic coefficient of each lens in the imaging lens in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 6

Table 7 below shows the high-order term coefficients A of the respective aspherical surfaces S1 to S10 usable for the respective aspherical lenses in this embodiment ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ And A ₁₆ . Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.9878E-03

-2.2125E-04

9.1487E-06

-2.4679E-07

4.1969E-09

-3.9470E-11

1.5242E-13

S2

9.1988E-03

-1.2003E-03

1.0237E-04

-5.3700E-06

1.6807E-07

-2.9078E-09

2.1521E-11

S3

5.4197E-03

-9.4525E-03

3.9457E-03

-1.0650E-03

1.5893E-04

-1.3346E-05

4.6780E-07

S4

-4.8952E-02

7.3165E-02

-7.0543E-02

5.1403E-02

-2.0970E-02

4.8084E-03

-4.5752E-04

S5

4.0860E-03

-5.4065E-03

2.2594E-03

-6.3322E-04

1.0293E-04

-9.0134E-06

3.0913E-07

S6

-2.0377E-02

9.6595E-04

9.9352E-04

-6.9453E-04

2.0110E-04

-2.6801E-05

1.4101E-06

S7

-3.2453E-03

2.6154E-03

-7.5611E-04

9.8857E-05

-1.0732E-05

3.4432E-07

-5.9364E-09

S8

-1.1613E-02

6.9425E-03

-1.6759E-03

1.4598E-04

-7.3967E-06

3.3301E-07

-4.6936E-09

S9

-4.0872E-02

1.1774E-03

-4.5816E-04

1.3441E-04

-1.4359E-05

5.7535E-07

-9.2178E-09

S10

-5.1639E-03

-6.7735E-03

1.5011E-03

-1.8255E-04

1.2650E-05

-4.8401E-07

7.5549E-09

TABLE 7

Fig. 12 shows on-axis chromatic aberration curves of the imaging lens of embodiment 3, which represent convergent focus deviations of light rays of different wavelengths after passing through an optical system. Fig. 13 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 3. Fig. 14 shows distortion curves of the imaging lens of embodiment 3, which represent distortion magnitude values in the case of different angles of view. Fig. 15 shows a relative illuminance curve of the imaging lens of example 3, which represents the peripheral picture light to center picture light ratio, reflecting the picture light uniformity. In summary, as can be seen with reference to fig. 12 to 15, the imaging lens according to embodiment 3 is an imaging lens with a large aperture, high relative brightness, a wide angle, and good imaging quality.

Example 4

Fig. 16 is a schematic diagram showing the structure of an imaging lens of embodiment 4. Referring to fig. 16 and as described above, the imaging lens according to embodiment 4 includes, in order from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5.

Table 8 below shows the surface type, radius of curvature, thickness, refractive index, dispersion coefficient, and conic coefficient of each lens in the imaging lens in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 8

Table 9 below shows the high-order term coefficients A of the aspherical surfaces S1 to S10 of the aspherical lenses usable in this embodiment ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ And A ₁₆ . Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

TABLE 9

Fig. 17 shows on-axis chromatic aberration curves of an imaging lens of embodiment 4, which represent convergent focus shifts of light rays of different wavelengths after passing through an optical system. Fig. 18 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 4. Fig. 19 shows distortion curves of the imaging lens of embodiment 4, which represent distortion magnitude values in the case of different angles of view. Fig. 20 shows a relative illuminance curve of the imaging lens of example 4, which represents the peripheral picture light to center picture light ratio, reflecting the picture light uniformity. In summary, as can be seen with reference to fig. 17 to 20, the imaging lens according to embodiment 4 is an imaging lens with a large aperture, high relative brightness, a wide angle, and good imaging quality.

Example 5

Fig. 21 is a schematic diagram showing the structure of an imaging lens of embodiment 5. With reference to fig. 21 and as described above, the imaging lens according to embodiment 5 includes, in order from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5.

Table 10 below shows the surface type, radius of curvature, thickness, refractive index, dispersion coefficient, and conic coefficient of each lens in the imaging lens in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 10

Table 11 below shows the high-order term coefficients A of the respective aspherical surfaces S1 to S10 usable for the respective aspherical lenses in this embodiment ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ And A ₁₆ . Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.2707E-02

-1.9511E-03

2.2354E-04

-1.6499E-05

7.5069E-07

-1.9038E-08

2.0878E-10

S2

1.5174E-02

-3.1832E-03

5.3507E-04

-5.9884E-05

4.1174E-06

-1.5277E-07

2.3078E-09

S3

1.2690E-02

-3.2960E-02

2.5731E-02

-1.1304E-02

2.7434E-03

-3.5229E-04

1.7918E-05

S4

-1.6970E-01

3.3129E-01

-5.9784E-01

8.0103E-01

-6.6950E-01

2.9886E-01

-5.3808E-02

S5

-1.0676E-02

7.6770E-03

-1.6177E-02

1.6991E-02

-8.5129E-03

2.0034E-03

-1.7996E-04

S6

-8.8309E-02

3.7772E-02

-1.6240E-02

-3.3808E-04

2.9500E-03

-8.8405E-04

7.9929E-05

S7

-2.4350E-02

2.1144E-02

-1.2339E-02

4.0102E-03

-7.2379E-04

6.7526E-05

-2.5316E-06

S8

-7.7622E-02

5.1981E-02

-2.2034E-02

6.3112E-03

-1.0535E-03

9.1247E-05

-3.1842E-06

S9

-1.1137E-01

1.7140E-02

-1.0223E-02

6.4028E-03

-1.7771E-03

2.3058E-04

-1.1685E-05

S10

3.1667E-03

-4.1313E-02

2.1930E-02

-6.4894E-03

1.1313E-03

-1.0496E-04

3.9159E-06

TABLE 11

Fig. 22 shows on-axis chromatic aberration curves of the imaging lens of embodiment 5, which represent the convergent focus deviation of light rays of different wavelengths after passing through an optical system. Fig. 23 shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 5. Fig. 24 shows distortion curves of the imaging lens of embodiment 5, which represent distortion magnitude values in the case of different angles of view. Fig. 25 shows a relative illuminance curve of the imaging lens of example 5, which represents the peripheral picture light to center picture light ratio, reflecting the picture light uniformity. In summary, as can be seen with reference to fig. 22 to 25, the imaging lens according to embodiment 5 is an imaging lens with a large aperture, high relative brightness, wide angle, and good imaging quality.

Example 6

Fig. 26 is a schematic diagram showing a structure of an imaging lens of embodiment 6. With reference to fig. 26 and in accordance with the description above, the imaging lens of embodiment 6 includes, in order from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5.

Table 12 below shows the surface type, radius of curvature, thickness, refractive index, dispersion coefficient, and conic coefficient of each lens in the imaging lens in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 12

Table 13 below shows the high-order term coefficients A of the aspherical surfaces S1 to S10 of the aspherical lenses usable in this embodiment ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ And A ₁₆ . Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

6.2659E-03

-5.9802E-04

4.2501E-05

-1.9293E-06

5.4198E-08

-8.5643E-10

5.9122E-12

S2

7.3792E-03

-1.0189E-03

1.1126E-04

-7.6866E-06

3.1636E-07

-6.9773E-09

6.2871E-11

S3

1.3749E-02

-1.5143E-02

6.4321E-03

-1.6159E-03

2.2106E-04

-1.5090E-05

3.4670E-07

S4

-6.1876E-02

7.6986E-02

-1.1055E-01

1.1076E-01

-6.5856E-02

2.0040E-02

-2.3824E-03

S5

-7.5171E-03

4.5988E-03

-5.2098E-03

3.1366E-03

-9.6631E-04

1.4611E-04

-8.6597E-06

S6

-5.2585E-02

1.9331E-02

-7.4046E-03

1.5242E-03

-1.0935E-04

-6.4066E-06

9.2434E-07

S7

-1.0349E-02

5.2755E-03

-2.1270E-03

4.7350E-04

-5.6499E-05

3.3914E-06

-8.0435E-08

S8

-4.4764E-02

1.7924E-02

-4.7375E-03

8.4271E-04

-8.6118E-05

4.5183E-06

-9.4324E-08

S9

-6.2792E-02

4.6520E-03

-8.8900E-04

5.5959E-04

-1.1964E-04

1.0970E-05

-3.8216E-07

S10

-1.9007E-02

-7.5421E-03

4.3545E-03

-1.0907E-03

1.4769E-04

-1.0150E-05

2.7401E-07

Watch 13

Fig. 27 shows on-axis chromatic aberration curves of an imaging lens of embodiment 6, which represent convergent focus shifts of light rays of different wavelengths after passing through an optical system. Fig. 28 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 6. Fig. 29 shows distortion curves of the imaging lens of embodiment 6, which represent distortion magnitude values in the case of different angles of view. Fig. 30 shows a relative illuminance curve of the imaging lens of example 6, which represents the peripheral picture light to central picture light ratio, reflecting the picture light uniformity. In summary, as can be seen with reference to fig. 27 to 30, the imaging lens according to embodiment 6 is an imaging lens with a large aperture, high relative brightness, a wide angle, and good imaging quality.

In summary, in the above examples 1 to 6, each conditional expression satisfies the conditions of the following table 14.

TABLE 14

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

Claims

1. An imaging lens includes, in order from an object side to an image side:

a first lens having a positive optical power;

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

a fourth lens having a positive optical power;

a fifth lens having a refractive power, an object-side surface of which is convex;

the number of the imaging lens with the lens with focal power is five;

the imaging lens is characterized in that the effective focal length f of the imaging lens and the effective focal length f1 of the first lens meet 5.5-Ap f1/f <12.05; and

the combined focal length f12 of the first lens and the second lens satisfies-3.5 < -f 12/f < -2.6.

2. The imaging lens of claim 1, wherein f/EPD ≦ 1.6 between the effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens.

3. An imaging lens according to claim 1 or 2, characterized in that 1.8-straw dt11/DT52<2.8 is satisfied between an effective radius DT11 of the object-side surface of the first lens and an effective radius DT52 of the image-side surface of the fifth lens.

4. The imaging lens according to claim 1, characterized in that 1.3-straw dt11/ImgH <3 is satisfied between an effective radius DT11 of the object-side surface of the first lens and half ImgH of a diagonal length of an effective pixel area on an imaging surface.

5. An imaging lens according to claim 1, characterized in that-1.2-straw R3/R6< -0.5 is satisfied between a radius of curvature R3 of the object-side surface of the second lens and a radius of curvature R6 of the image-side surface of the third lens.

6. The imaging lens assembly of any one of claims 1, 4 and 5, wherein at least one of the object-side surface and the image-side surface of the first lens element has at least one inflection point.

7. The imaging lens according to any one of claims 1, 4, and 5, wherein ImgH/f is equal to or greater than 1.1 between half of a diagonal length ImgH of an effective pixel region on an imaging plane and an effective focal length f of the imaging lens.

8. The imaging lens according to any one of claims 1, 4, and 5, wherein 1.5-f 1/f3<8 is satisfied between an effective focal length f1 of the first lens and an effective focal length f3 of the third lens.

9. The imaging lens according to any one of claims 1, 4, and 5, wherein 1.4 ≦ f3/f <3.8 is satisfied between an effective focal length f3 of the third lens and an effective focal length f of the imaging lens.

10. An imaging lens according to claim 1, characterized in that 2-n dt11/DT21<3.4 is satisfied between an effective radius DT11 of the first lens object-side surface and an effective radius DT21 of the second lens object-side surface.

11. An imaging lens according to claim 10, wherein an effective focal length f5 of the fifth lens element and an effective focal length f of the imaging lens satisfy | f/f5 | 0.2.

12. The imaging lens of claim 11, wherein an infrared band pass filter is disposed between the fifth lens and the imaging surface.

13. Imaging lens according to any of claims 10 to 12, characterized in that a diaphragm is arranged between the second lens and the third lens.

14. An imaging lens includes, in order from an object side to an image side:

a first lens having a positive optical power;

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

a fourth lens having positive optical power;

the number of the imaging lens with the lens with focal power is five;

the lens is characterized in that 1.3-straw DT11/ImgH <3 is satisfied between the effective radius DT11 of the object side surface of the first lens and half ImgH of the diagonal length of an effective pixel area on an imaging surface; and

and the combined focal length f12 of the first lens and the second lens and the effective focal length f of the imaging lens meet-3.5 and are woven into a fabric of f12/f < -2.6.

15. The imaging lens of claim 14, wherein f/EPD ≦ 1.6 between the effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens.

16. An imaging lens according to claim 14 or 15, wherein 1.8-straw dt11/DT52<2.8 is satisfied between an effective radius DT11 of the object-side surface of the first lens and an effective radius DT52 of the image-side surface of the fifth lens.

17. The imaging lens according to claim 15, characterized in that 5.5-straw f1/f <25 is satisfied between an effective focal length f of the imaging lens and an effective focal length f1 of the first lens.

18. An imaging lens according to claim 14, characterized in that-1.2-strande R3/R6< -0.5 is satisfied between a radius of curvature R3 of the object-side surface of the second lens and a radius of curvature R6 of the image-side surface of the third lens.

19. The imaging lens assembly of any one of claims 14, 17 and 18, wherein at least one of the object-side surface and the image-side surface of the first lens element has at least one inflection point.

20. The imaging lens according to any one of claims 14, 17 and 18, wherein ImgH/f ≧ 1.1 is satisfied between half of a diagonal length of an effective pixel region on the imaging plane and an effective focal length f of the imaging lens.

21. The imaging lens according to any one of claims 14, 17, and 18, wherein 1.5-f 1/f3<8 is satisfied between an effective focal length f1 of the first lens and an effective focal length f3 of the third lens.

22. The imaging lens according to any one of claims 14, 17, and 18, wherein 1.4 ≦ f3/f <3.8 is satisfied between an effective focal length f3 of the third lens and an effective focal length f of the imaging lens.

23. An imaging lens according to claim 14, characterized in that 2-straw dt11/DT21<3.4 is satisfied between an effective radius DT11 of the first lens object-side surface and an effective radius DT21 of the second lens object-side surface.

24. An imaging lens system according to claim 23 wherein the effective focal length f5 of the fifth lens element and the effective focal length f of the imaging lens system satisfy | f/f5 | 0.2.

25. The imaging lens according to claim 24, wherein an infrared band pass filter is disposed between the fifth lens and the imaging surface.

26. An imaging lens according to any one of claims 23 to 25, characterized in that a diaphragm is provided between the second lens and the third lens.