CN114721122B

CN114721122B - Scanning lens and scanning lens module

Info

Publication number: CN114721122B
Application number: CN202210158929.1A
Authority: CN
Inventors: 廖仁泽; 王�锋; 周明明; 马庆鸿; 万良伟
Original assignee: Guangdong Xingjuyu Optical Co ltd
Current assignee: Guangdong Xingjuyu Optical Co ltd
Priority date: 2022-02-21
Filing date: 2022-02-21
Publication date: 2024-04-05
Anticipated expiration: 2042-02-21
Also published as: CN114721122A

Abstract

The invention discloses a scanning lens and a scanning lens module, which belong to the technical field of optical imaging, and sequentially comprise the following components from an object side to an image side along an optical axis: a first lens having positive optical power; a second lens having optical power, an image side surface of which is convex near the optical axis; a third lens having optical power, an object side surface of which is convex near the optical axis; a fourth lens having optical power, an image side surface of which is convex near the optical axis; and a fifth lens having negative optical power, an image side surface of which is concave near the optical axis; the scanning lens satisfies the following conditional expression: 6.71< f/EPD <8.70. The first lens, the second lens, the third lens, the fourth lens and the fifth lens are configured according to the combination, so that the curvature of field, distortion and high-order aberration of the scanning lens can be corrected, and the imaging quality of the scanning lens can be improved. When the relation of 6.71< F/EPD <8.70 is satisfied, the scanning lens is favorable for obtaining a larger F number of the aperture, the depth of field of the scanning lens is larger, and the scanning accuracy of the scanning lens is improved.

Description

Scanning lens and scanning lens module

Technical Field

The present invention relates to the field of optical imaging technologies, and in particular, to a scanning lens and a scanning lens module.

Background

With the continuous development of consumer electronics, the market demand for scanning electronics is increasing, and the quality and demand for scanning lenses are also increasing. In the existing scanning lens, because the depth of field is smaller and distortion is larger, the scanning range of the lens is smaller, the scanned image and text is deformed greatly, the scanned result is easy to be wrong and even cannot be scanned, and the scanning accuracy of the scanning lens is lower.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the scanning lens and the scanning lens module, which effectively increase the depth of field and reduce the distortion, so that the scanning lens has higher accuracy in scanning.

In a first aspect, a scanning lens sequentially includes, along an optical axis from an object side to an image side:

a first lens having positive optical power;

a second lens having optical power, an image side surface of which is convex near the optical axis;

a third lens having optical power, an object side surface of which is convex near the optical axis;

a fourth lens having optical power, an image side surface of which is convex near the optical axis; and

a fifth lens having negative optical power, an image side surface of which is concave near the optical axis;

The first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspheric lenses;

the scanning lens satisfies the following conditional expression:

6.71<f/EPD<8.70；

where f is the total effective focal length of the scan lens, and EPD is the entrance pupil diameter of the scan lens.

Optionally, the scanning lens satisfies the following conditional expression:

0.69<f/ImgH<0.89；

wherein f is the total effective focal length of the scanning lens, and ImgH is the maximum image height of the scanning lens.

Optionally, the scanning lens satisfies the following conditional expression:

90°<FOV<110°；

wherein, FOV is the maximum field angle of the scanning lens.

Optionally, the scanning lens satisfies the following conditional expression:

23.3<f1/f<27.4；-5.09<f5/f<-2.30；

wherein f is the total effective focal length of the scanning lens, f1 is the effective focal length of the first lens, and f5 is the effective focal length of the fifth lens.

Optionally, the scanning lens satisfies the following conditional expression:

1.79<(R51+R52)/(R51-R52)<4.17；

wherein R51 is a radius of curvature of the object-side surface of the fifth lens element, and R52 is a radius of curvature of the image-side surface of the fifth lens element.

Optionally, the scanning lens satisfies the following conditional expression:

0.53<(DT32+DT42)/(f4-f3)<0.78；

wherein DT32 is the maximum effective radius of the image-side surface of the third lens element, DT42 is the maximum effective radius of the image-side surface of the fourth lens element, f3 is the effective focal length of the third lens element, and f4 is the effective focal length of the fourth lens element.

Optionally, the scanning lens satisfies the following conditional expression:

-4.05<(SAG51+SAG52)/(SAG11+SAG12)<0；

wherein SAG51 is a distance on the optical axis between an intersection point of the object side surface of the fifth lens and the optical axis and an effective radius vertex of the object side surface of the fifth lens, SAG52 is a distance on the optical axis between an intersection point of the image side surface of the fifth lens and the optical axis and an effective radius vertex of the image side surface of the fifth lens, SAG11 is a distance on the optical axis between an intersection point of the object side surface of the first lens and the optical axis and an effective radius vertex of the object side surface of the first lens, and SAG12 is a distance on the optical axis between an intersection point of the image side surface of the first lens and the optical axis and an effective radius vertex of the image side surface of the first lens.

Optionally, the scanning lens satisfies the following conditional expression:

21.20<f1/f2345<25.01；

wherein f1 is an effective focal length of the first lens, and f2345 is a combined focal length of the second lens, the third lens, the fourth lens and the fifth lens.

Optionally, the scanning lens satisfies the following conditional expression:

the object side surface and the image side surface of the first lens, the object side surface and the image side surface of the second lens, the object side surface and the image side surface of the third lens, the object side surface and the image side surface of the fourth lens and the object side surface and the image side surface of the fifth lens are all coated with infrared films.

In a second aspect, a scanning lens module is provided, comprising a scanning lens in any one of the possible implementations of the first aspect.

The invention has the beneficial effects that:

the first lens, the second lens, the third lens, the fourth lens and the fifth lens are configured according to the combination, so that the curvature of field, distortion and high-order aberration of the scanning lens can be corrected, and the imaging quality of the scanning lens can be improved. When the relation of 6.71< F/EPD <8.70 is satisfied, the scanning lens is favorable for obtaining a larger F number, the depth of field range of the scanning lens is increased, and the accuracy of the scanning lens in the scanning process is improved. Therefore, the scanning lens has larger depth of field and smaller distortion, and the scanning accuracy of the scanning lens is improved.

Drawings

Fig. 1 is a schematic configuration diagram of a scanning lens according to a first embodiment of the present application;

FIG. 2 is a graph of spherical aberration of a scanning lens according to an embodiment of the present application;

FIG. 3 is an astigmatic curve diagram of a scanning lens according to a first embodiment of the present application;

fig. 4 is a distortion chart of a scanning lens according to the first embodiment of the present application;

fig. 5 is a magnification chromatic aberration diagram of a scanning lens according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a scanning lens of a second embodiment of the present application;

FIG. 7 is a graph of spherical aberration of a scanning lens according to a second embodiment of the present application;

FIG. 8 is an astigmatic curve diagram of a scanning lens according to a second embodiment of the present application;

fig. 9 is a distortion graph of a scanning lens according to a second embodiment of the present application;

fig. 10 is a magnification chromatic aberration diagram of a scanning lens according to a second embodiment of the present application;

fig. 11 is a schematic structural diagram of a scanning lens of a third embodiment of the present application;

FIG. 12 is a graph of spherical aberration of a scanning lens according to embodiment III of the present application;

fig. 13 is an astigmatic curve diagram of a scanning lens according to a third embodiment of the present application;

fig. 14 is a distortion graph of a scanning lens of the third embodiment of the present application;

fig. 15 is a magnification chromatic aberration diagram of a scanning lens of the third embodiment of the present application;

fig. 16 is a schematic configuration diagram of a scanning lens of a fourth embodiment of the present application;

FIG. 17 is a graph of spherical aberration of a scanning lens according to fourth embodiment of the present application;

fig. 18 is an astigmatic curve diagram of a scanning lens according to a fourth embodiment of the present application;

fig. 19 is a distortion graph of a scanning lens of the fourth embodiment of the present application;

fig. 20 is a magnification chromatic aberration diagram of a scanning lens of the fourth embodiment of the present application;

fig. 21 is a schematic structural diagram of a scanning lens of a fifth embodiment of the present application;

FIG. 22 is a graph of spherical aberration of a scanning lens according to embodiment five of the present application;

Fig. 23 is an astigmatic curve diagram of a scanning lens of a fifth embodiment of the present application;

fig. 24 is a distortion graph of a scanning lens of embodiment five of the present application;

fig. 25 is a magnification chromatic aberration chart of a scanning lens of embodiment five of the present application;

fig. 26 is a schematic configuration diagram of a scanning lens of a sixth embodiment of the present application;

FIG. 27 is a graph of spherical aberration of a scanning lens according to embodiment six of the present application;

fig. 28 is an astigmatic curve diagram of a scanning lens according to a sixth embodiment of the present application;

fig. 29 is a distortion graph of a scanning lens of embodiment six of the present application;

fig. 30 is a chromatic aberration of magnification graph of a scanning lens of embodiment six of the present application;

fig. 31 is a schematic configuration diagram of a scanning lens of a seventh embodiment of the present application;

FIG. 32 is a graph of spherical aberration of a scanning lens according to embodiment seven of the present application;

FIG. 33 is an astigmatic curve of a scanning lens according to a seventh embodiment of the present application;

fig. 34 is a distortion graph of a scanning lens of embodiment seven of the present application;

fig. 35 is a magnification chromatic aberration chart of a scanning lens of the seventh embodiment of the present application.

In the figure:

100. a scanning lens; 101. a first lens; 102. a second lens; 103. a third lens; 104. a fourth lens; 105. a fifth lens; 106. a light filter; 107. an image sensor.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

For ease of understanding, the technical terms referred to in the present application are explained and described below.

TTL is the distance between the object side surface of the first lens and the imaging surface of the scanning lens on the optical axis;

no is the F number of the scanning lens;

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

ImgH is the maximum image height of the scanning lens;

EPD is the entrance pupil diameter of the scanning lens;

f is the total effective focal length of the scanning lens;

f1 is the effective focal length of the first lens;

f3 is the effective focal length of the third lens;

f4 is the effective focal length of the fourth lens;

f5 is the effective focal length of the fifth lens;

f2345 is the combined focal length of the second lens, the third lens, the fourth lens and the fifth lens;

r51 is the radius of curvature of the fifth lens object-side surface;

r52 is the radius of curvature of the image-side surface of the fifth lens element;

DT32 is the maximum effective radius of the image-side surface of the third lens;

DT42 is the maximum effective radius of the image-side surface of the fourth lens;

SAG11 is the distance between the intersection point of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens on the optical axis;

SAG12 is the distance on the optical axis from the intersection of the image side of the first lens and the optical axis to the apex of the effective radius of the image side of the first lens;

SAG51 is the distance on the optical axis from the intersection point of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens;

SAG52 is the distance on the optical axis from the intersection of the image side surface of the fifth lens and the optical axis to the apex of the effective radius of the image side surface of the fifth lens.

As shown in fig. 1, the scanning lens 100 of the embodiment of the present application includes 5 lenses. For convenience of description, the left side of the scan lens 100 is defined as a subject side (hereinafter, may also be referred to as an object side), a surface of the lens facing the object side may be referred to as an object side, the object side may also be referred to as a surface of the lens near the object side, the right side of the scan lens 100 is an image side (hereinafter, may also be referred to as an image side), a surface of the lens facing the image side may be referred to as an image side, and the image side may also be referred to as a surface of the lens near the image side. The scanning lens 100 of the embodiment of the present application sequentially includes, from the object side to the image side: a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, and a fifth lens 105; a stop may also be provided between the first lens 101 and the second lens 102. An image sensor 107, such as a CCD, CMOS, or the like, may also be provided behind the fifth lens 105. A filter 106, such as a flat infrared cut filter, may also be provided between the fifth lens 105 and the image sensor 107. The scanning lens 100 is described in detail below.

It should be noted that, for convenience of understanding and description, in the embodiments of the present application, the representation forms of relevant parameters of the scanning lens are defined, for example, TTL is used to represent the distance between the object side surface of the first lens and the imaging surface of the scanning lens on the optical axis; imgH represents the maximum image height of the scanning lens, and letter representations similar to the definition are merely schematic, and of course, may be represented in other forms, and the application is not limited in any way.

In the following relation, the unit of the parameter related to the ratio is kept uniform, for example, the unit of the numerator is millimeter (mm) and the unit of the denominator is millimeter (mm).

The positive and negative of the radius of curvature means that the optical surface is convex toward the object side or convex toward the image side, and when the optical surface (including the object side or the image side) is convex toward the object side, the radius of curvature of the optical surface is positive; when the optical surface (including the object side surface or the image side surface) is convex toward the image side, the optical surface is concave toward the object side surface, and the radius of curvature of the optical surface is negative.

It should be noted that, the shapes of the lenses and the concave-convex degree of the object side and the image side in the drawings are merely schematic, and the embodiments of the present application are not limited in any way. In the present application, the material of the lens may be resin (resin), plastic (plastic), glass (glass). The lens includes a spherical lens and an aspherical lens. The lens can be a fixed focal length lens or a zoom lens, and can also be a standard lens, a short focal length lens or a long focal length lens.

Referring to fig. 1, a broken line is used to represent the optical axis of the lens in fig. 1.

The scanning lens 100 of the embodiment of the present application includes, in order from an object side to an image side: a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, and a fifth lens 105.

It should be understood that the above-mentioned "each lens of the optical imaging lens" refers to a lens that constitutes the optical imaging lens, and in the embodiment of the present application, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens.

Alternatively, in embodiments of the present application,

the first lens 101 may have positive optical power, and an object side surface S1 of the first lens 101 is concave near the optical axis; the image side surface S2 of the first lens 101 is convex near the optical axis;

the second lens 102 may have positive optical power, the object-side surface S3 of the second lens 102 being concave near the optical axis, and the image-side surface S4 of the second lens 102 being convex near the optical axis;

the third lens 103 may have negative optical power, the object-side surface S5 of the third lens 103 being convex near the optical axis, and the image-side surface S6 of the third lens 103 being concave near the optical axis;

the fourth lens element 104 may have positive optical power, wherein an object-side surface S7 of the fourth lens element 104 is convex near the optical axis and an image-side surface S8 of the fourth lens element 104 is convex near the optical axis;

The fifth lens 105 may have negative optical power, the object side surface S9 of the fifth lens 105 being convex near the optical axis, and the image side surface S10 of the fifth lens 105 being concave near the optical axis.

the combined configuration of the lenses is beneficial to correcting field curvature, distortion and high-order aberration of the scanning lens and improving the imaging quality of the scanning lens.

The scanning lens satisfies the following conditional expression: 6.71< f/EPD <8.70.

The relation above specifies that 6.71< F/EPD <8.70, preferably 6.71< F/EPD <7.85, which is favorable for the scanning lens to obtain a larger F-number, so that the depth of field of the scanning lens is larger, and the accuracy of the scanning lens in the scanning process is improved.

In certain implementations of the first aspect, the scanning lens satisfies the following conditional expression: 0.69< f/ImgH <0.89.

The relation formula specifies that 0.69< f/ImgH <0.89, preferably 0.75< f/ImgH <0.89, and the f/ImgH ratio is controlled within a reasonable range, so that when the optical imaging lens has a longer focal length, the image surface is matched more appropriately on the basis of meeting a larger depth of field range, and the matching degree of the image sensor is improved.

In certain implementations of the first aspect, the scanning lens satisfies the following conditional expression: 90 ° < FOV <110 °.

In the above relation, the maximum angle of view is controlled within a wide range by defining 90 ° < FOV <110 °, preferably 90 ° < FOV <99.2 °, so that the scanning lens has a wide scanning range, and the scanning efficiency is improved.

In certain implementations of the first aspect, the scanning lens satisfies the following conditional expression: 23.3< f1/f <27.4; -5.09< f5/f < -2.30.

23.3< f1/f <27.4, -5.09< f5/f < -2.30; preferably 25< f1/f <27, -5< f5/f < -3.2, and reasonably distributing the focal power of the first lens and the focal power of the fifth lens, so that the scanning lens has better tolerance performance and better image quality.

In certain implementations of the first aspect, the scanning lens satisfies the following conditional expression: 1.79< (R51+R52)/(R51-R52) <4.17.

The above relation specifies that 1.79< (R51+R52)/(R51-R52) <4.17, preferably 3.1< (R51+R52)/(R51-R52) <4.17, and the shape of the fifth lens is reasonably controlled so that the fifth lens can effectively correct spherical aberration of the scanning lens and improve the scanning quality of the scanning lens.

In certain implementations of the first aspect, the scanning lens satisfies the following conditional expression: 0.53< (DT 32+DT 42)/(f 4-f 3) <0.78.

The above relation specifies that 0.53< (DT 32+DT 42)/(f 4-f 3) <0.78, preferably 0.53< (DT 32+DT 42)/(f 4-f 3) <0.68, is advantageous for controlling the contribution of spherical aberration and astigmatism of the third lens and the fourth lens and improving the scanning quality of the scanning lens.

In certain implementations of the first aspect, the scanning lens satisfies the following conditional expression:

-4.05<(SAG51+SAG52)/(SAG11+SAG12)<0。

in the above relation, it is specified that-4.05 < (SAG51+SAG52)/(SAG11+SAG12) <0, preferably

-4.05< (SAG51+SAG52)/(SAG11+SAG12) < -0.17, avoiding the first lens and the fifth lens from being excessively bent, being beneficial to the molding and assembly of lenses in the optical imaging lens and improving the reliability of the scanning lens in use.

In certain implementations of the first aspect, the scanning lens satisfies the following conditional expression: 21.20< f1/f2345<25.01.

The relation above specifies that 21.20< f1/f2345<25.01, preferably 23.1< f1/f2345<25.0, and the focal power of the first lens and the combined focal length of the second lens, the third lens, the fourth lens and the fifth lens are reasonably distributed, so that the better balanced aberration of the scanning lens can be obtained, the resolution of the scanning lens can be improved, and the scanning quality of the scanning lens can be improved.

In some implementations of the first aspect, the object side surface and the image side surface of the first lens, the object side surface and the image side surface of the second lens, the object side surface and the image side surface of the third lens, the object side surface and the image side surface of the fourth lens, and the object side surface and the image side surface of the fifth lens are all coated with infrared films, when the scanning environment of the scanning lens is darker, both visible light and infrared rays can enter the lens, so that the scanning lens is ensured to have sufficient light entering amount, and the stability of the working performance of the scanning lens during scanning is improved.

In a second aspect, a scanning lens module is provided, including the scanning lens in any one of possible implementation manners of the first aspect, and may further include an image sensor, an analog-to-digital converter, an image processor, a memory, and the like, to implement a scanning function of the scanning lens.

Some specific, but non-limiting examples of embodiments of the present application are described in more detail below in conjunction with fig. 1-35.

Note that, in the embodiment of the present application, the material of each lens of the scanning lens 100 is not particularly limited.

Example 1

The scanning lens 100 according to an embodiment of the present application sequentially includes, from an object side to an image side: the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, and the fifth lens 105 are shown in fig. 1.

For convenience of description, in the following embodiment, STO represents the surface of the diaphragm, S1 represents the object side surface of the first lens element 101, S2 represents the image side surface of the first lens element 101, S3 represents the object side surface of the second lens element 102, S4 represents the image side surface of the second lens element 102, S5 represents the object side surface of the third lens element 103, S6 represents the image side surface of the third lens element 103, S7 represents the object side surface of the fourth lens element 104, S8 represents the image side surface of the fourth lens element 104, S9 represents the object side surface of the fifth lens element 105, S10 represents the image side surface of the fifth lens element 105, S11 represents the object side surface of the infrared filter element, S12 represents the image side surface of the infrared filter element, and S13 represents the image plane. The total optical length of the scanning lens 100 is represented by TTL, the maximum image height of the scanning lens 100 is represented by ImgH, and the effective focal length of the scanning lens 100 is represented by EFL. The i-th order aspheric coefficients are denoted by αi, i=4, 6, 8, 10, 12, 14, 16, and the cone coefficients are denoted by K.

In accordance with the above relation, table 1 shows the effective focal length EFL, the maximum field angle FOV, the total optical length TTL, the F-number Fno, the surface type, the radius of curvature, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 according to the first embodiment, wherein the units of the radius of curvature and the thickness are millimeter (mm), as shown in table 1:

TABLE 1

Table 2 shows the aspherical coefficients of the scanning lens 100 of the first embodiment of the present application, as shown in table 2:

TABLE 2

Face number

A4

A6

A8

A10

A12

A14

A16

S1

3.402E-01

-3.311E-01

1.068E-01

7.820E-02

-8.033E-05

-4.969E-02

1.415E-02

S2

4.037E-01

-6.916E-01

-5.694E-01

4.883E+00

-7.497E+00

4.027E+00

-2.542E-01

S3

1.855E-02

-5.035E+01

-7.398E+02

5.357E+05

-2.534E+07

1.001E+09

-7.566E+10

S4

-1.573E+00

3.678E+00

-3.515E+01

2.504E+02

3.517E+02

-1.080E+04

3.258E+04

S5

-1.346E+00

-1.003E+00

1.657E+00

-7.103E+00

-1.074E+01

5.002E+01

-5.986E+02

S6

-5.484E-01

2.504E-01

-5.889E-02

3.493E-01

-1.453E-01

-3.608E-01

1.756E-01

S7

-7.283E-03

-2.305E-01

2.790E-01

-4.502E-02

-6.868E-02

5.435E-02

-3.110E-02

S8

3.569E-01

-3.356E-01

7.041E-02

-3.822E-03

8.814E-03

-8.726E-04

-1.687E-03

S9

-2.510E-01

1.082E-01

3.567E-02

-6.016E-02

1.925E-02

-9.069E-04

-4.831E-04

S10

-1.630E-01

6.036E-02

-1.329E-02

2.437E-03

-9.612E-04

-3.042E-04

1.284E-04

The non-curved surfaces of the respective lenses of the imaging optical lens 100 satisfy:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height 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 inverse of radius r of curvature in table 1 above); k is the conic constant (given in table 1 above); ai is the correction coefficient of the i-n th order of the aspherical surface, and the higher order coefficients A4, A6, A8, a10, a12, a14, and a16 of the respective lens surfaces S1 to S10 are shown in table 2.

It should be understood that the aspherical surface of each lens in the scanning lens 100 may be an aspherical surface shown by the above-mentioned aspherical surface formula, or may be other aspherical surface formulas, which is not limited in this application.

The design data of the scanning lens 100 according to the first embodiment of the present application are given above, and the effective focal length EFL is 1.438mm, the maximum field angle FOV is 99.210 degrees, the total optical length TTL is 3.947mm, and the aperture F-number Fno is 6.848.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the entrance pupil diameter of the scanning lens satisfies: f/epd= 6.715.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the maximum image height of the scanning lens satisfies: f/imgh=0.824.

In one embodiment provided herein, the maximum field angle fov= 99.210 of the scan lens.

In one embodiment provided herein, f1/f= 27.081.

In one embodiment provided herein, f5/f= -5.002.

In one embodiment provided herein, (r51+r52)/(r51—r52) =3.498.

In one embodiment provided herein, (dt32+dt42)/(f 4-f 3) =0.587.

In one embodiment provided herein, (sag51+sag52)/(sag11+sag12) = -3.997.

In one embodiment provided herein, f1/f2345=25.000.

Fig. 2 to 5 illustrate the optical performance of a scanning lens 100 designed in such a lens combination manner as one embodiment.

In the first embodiment, the scanning lens satisfies the requirements of large depth of field, small distortion and excellent scanning quality.

Example two

The scanning lens 100 according to an embodiment of the present application sequentially includes, from an object side to an image side: the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, and the fifth lens 105 are illustrated in fig. 6.

In accordance with the above relation, table 3 shows the effective focal length EFL, the maximum field angle FOV, the total optical length TTL, the F-number Fno, the surface type, the radius of curvature, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the second embodiment, wherein the units of the radius of curvature and the thickness are millimeter (mm), as shown in table 3:

TABLE 3 Table 3

Table 4 shows the aspherical coefficients of the scanning lens 100 of the second embodiment of the present application, as shown in table 4:

TABLE 4 Table 4

Face number

A4

A6

A8

A10

A12

A14

A16

S1

3.312E-01

-3.290E-01

1.123E-01

8.006E-02

-9.218E-04

-5.172E-02

1.186E-02

S2

4.205E-01

-7.006E-01

-5.803E-01

4.894E+00

-7.454E+00

4.069E+00

-4.814E-01

S3

5.039E-01

-1.880E+01

-1.635E+03

4.219E+05

-3.263E+07

9.990E+08

-1.050E+10

S4

-1.712E+00

6.065E+00

-2.806E+01

2.432E+02

1.400E+02

-1.156E+04

3.772E+04

S5

-1.182E+00

-9.719E-01

1.028E+00

-7.423E+00

1.024E+01

1.526E+02

-3.112E+02

S6

-5.743E-01

2.819E-01

1.029E-02

4.027E-01

-1.351E-01

-3.682E-01

1.551E-01

S7

2.732E-02

-2.335E-01

2.722E-01

-4.860E-02

-6.858E-02

5.486E-02

-3.019E-02

S8

3.624E-01

-3.261E-01

7.824E-02

-2.879E-05

9.852E-03

-1.128E-03

-2.157E-03

S9

-2.540E-01

1.064E-01

3.506E-02

-5.989E-02

1.957E-02

-7.144E-04

-3.847E-04

S10

-1.746E-01

6.413E-02

-1.203E-02

2.900E-03

-8.639E-04

-3.059E-04

1.158E-04

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height 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 inverse of radius r in table 3 above); k is the conic constant (given in table 3 above); ai is the correction coefficient of the i-n th order of the aspherical surface, and the higher order coefficients A4, A6, A8, a10, a12, a14 and a16 of the respective lens surfaces S1 to S10 are shown in table 4.

The design data of the scanning lens 100 according to the second embodiment of the present application are given above, and the effective focal length EFL is 1.867mm, the maximum field angle FOV is 98.970 degrees, the total optical length TTL is 4.180mm, and the aperture F-number Fno is 9.241.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the entrance pupil diameter of the scanning lens satisfies: f/epd= 8.696.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the maximum image height of the scanning lens satisfies: f/imgh=0.788.

In one embodiment provided herein, the maximum field angle fov= 98.970 of the scan lens.

In one embodiment provided herein, f1/f= 23.312.

In one embodiment provided herein, f5/f= -3.207.

In one embodiment provided herein, (r51+r52)/(r51—r52) =3.104.

In one embodiment provided herein, (dt32+dt42)/(f 4-f 3) =0.686.

In one embodiment provided herein, (sag51+sag52)/(sag11+sag12) = -2.893.

In one embodiment provided herein, f 1/f2345= 21.200.

Fig. 7 to 10 illustrate the optical performance of the scanning lens 100 designed in the lens combination manner of the second embodiment.

In the second embodiment, the scanning lens meets the requirements of large depth of field, small distortion and excellent scanning quality.

Example III

The scanning lens 100 according to an embodiment of the present application sequentially includes, from an object side to an image side: the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, and the fifth lens 105 are illustrated in fig. 11.

In accordance with the above relation, table 5 shows the effective focal length EFL, the maximum field angle FOV, the total optical length TTL, the F-number Fno, the surface type, the radius of curvature, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the third embodiment, wherein the units of the radius of curvature and the thickness are millimeter (mm), as shown in table 5:

TABLE 5

Table 6 shows the aspherical coefficients of the scanning lens 100 of the third embodiment of the present application, as shown in table 6:

TABLE 6

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height 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 inverse of radius r in table 5 above); k is the conic constant (given in table 5 above); ai is the correction coefficient of the i-n th order of the aspherical surface, and the higher order coefficients A4, A6, A8, a10, a12, a14 and a16 of the respective lens surfaces S1 to S10 are shown in table 6.

The design data of the scanning lens 100 according to the third embodiment of the present application are given above, and the effective focal length EFL is 1.682mm, the maximum field angle FOV is 90.004 degrees, the total optical length TTL is 4.081mm, and the aperture F-number Fno is 8.105.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the entrance pupil diameter of the scanning lens satisfies: f/epd= 7.850.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the maximum image height of the scanning lens satisfies: f/imgh=0.890.

In one embodiment provided herein, the maximum field angle fov= 90.004 of the scan lens.

In one embodiment provided herein, f1/f= 25.343.

In one embodiment provided herein, f5/f= -3.743.

In one embodiment provided herein, (r51+r52)/(r51—r52) = 3.140.

In one embodiment provided herein, (dt32+dt42)/(f 4-f 3) =0.533.

In one embodiment provided herein, (sag51+sag52)/(sag11+sag12) = -0.004.

In one embodiment provided herein, f 1/f2345= 23.213.

Fig. 12 to 15 describe the optical performance of the scanning lens 100 designed in the three-lens combination manner of the embodiment.

In the third embodiment, the scanning lens satisfies the requirements of large depth of field, small distortion and excellent scanning quality.

Example IV

The scanning lens 100 according to an embodiment of the present application sequentially includes, from an object side to an image side: the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, and the fifth lens 105 are illustrated in fig. 16.

In accordance with the above relation, table 7 shows the effective focal length EFL, the maximum field angle FOV, the total optical length TTL, the F-number Fno, the surface type, the radius of curvature, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the fourth embodiment, wherein the units of the radius of curvature and the thickness are millimeter (mm), as shown in table 7:

TABLE 7

Table 8 shows the aspherical coefficients of the scanning lens 100 of the fourth embodiment of the present application, as shown in table 8:

TABLE 8

Face number

A4

A6

A8

A10

A12

A14

A16

S1

3.296E-01

-3.282E-01

1.106E-01

7.873E-02

-1.271E-03

-5.237E-02

1.146E-02

S2

4.214E-01

-6.967E-01

-5.852E-01

4.890E+00

-7.467E+00

4.054E+00

-4.746E-01

S3

2.767E-02

-4.384E+01

-9.488E+02

4.290E+05

-3.013E+07

1.031E+09

-1.320E+10

S4

-1.654E+00

4.176E+00

-2.978E+01

2.723E+02

3.530E+02

-1.074E+04

3.666E+04

S5

-1.174E+00

-1.114E+00

1.568E+00

-5.370E+00

1.322E+01

1.524E+02

-3.134E+02

S6

-5.672E-01

2.797E-01

4.185E-03

4.053E-01

-1.247E-01

-3.714E-01

1.240E-01

S7

1.947E-02

-2.425E-01

2.668E-01

-4.943E-02

-6.629E-02

5.846E-02

-2.422E-02

S8

3.695E-01

-3.252E-01

7.872E-02

1.509E-03

1.006E-02

-1.175E-03

-2.304E-03

S9

-2.539E-01

1.063E-01

3.505E-02

-5.987E-02

1.957E-02

-7.117E-04

-3.848E-04

S10

-1.710E-01

6.568E-02

-1.191E-02

2.891E-03

-8.709E-04

-3.099E-04

1.131E-04

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height 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 inverse of radius r of curvature in table 7 above); k is the conic constant (given in table 7 above); ai is the correction coefficient of the i-n th order of the aspherical surface, and the higher order coefficients A4, A6, A8, a10, a12, a14, a16 of the lens surfaces S1 to S10 are shown in table 8.

The design data of the scanning lens 100 according to the fourth embodiment of the present application are given above, and the effective focal length EFL is 1.674mm, the maximum field angle FOV is 109.997 degrees, the total optical length TTL is 3.868mm, and the aperture F-number Fno is 8.009.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the entrance pupil diameter of the scanning lens satisfies: f/epd= 7.746.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the maximum image height of the scanning lens satisfies: f/imgh=0.690.

In one embodiment provided herein, the maximum field angle fov= 109.997 of the scan lens.

In one embodiment provided herein, f1/f= 25.073.

In one embodiment provided herein, f5/f= -3.530.

In one embodiment provided herein, (r51+r52)/(r51—r52) = 3.030.

In one embodiment provided herein, (dt32+dt42)/(f 4-f 3) = 0.663.

In one embodiment provided herein, (sag51+sag52)/(sag11+sag12) = -2.482.

In one embodiment provided herein, f 1/f2345= 23.124.

Fig. 17 to 20 describe the optical performance of the scanning lens 100 designed in the lens combination manner of the fourth embodiment.

In the fourth embodiment, the scanning lens satisfies the requirements of large depth of field, small distortion, and excellent scanning quality.

Example five

The scanning lens 100 according to an embodiment of the present application sequentially includes, from an object side to an image side: the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, and the fifth lens 105 are illustrated in fig. 21.

In accordance with the above relation, table 9 shows the effective focal length EFL, the maximum field angle FOV, the total optical length TTL, the F-number Fno, the surface type, the radius of curvature, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the fifth embodiment, wherein the units of the radius of curvature and the thickness are millimeter (mm), as shown in table 9:

TABLE 9

/>

Table 10 shows the aspherical coefficients of the scanning lens 100 of the fifth embodiment of the present application, as shown in table 10:

table 10

Face number

A4

A6

A8

A10

A12

A14

A16

S1

3.403E-01

-3.227E-01

1.130E-01

8.015E-02

-3.586E-04

-5.098E-02

1.286E-02

S2

4.221E-01

-6.908E-01

-5.665E-01

4.911E+00

-7.448E+00

4.054E+00

-5.003E-01

S3

9.628E-02

-4.013E+01

-9.366E+02

4.713E+05

-3.081E+07

1.012E+09

-1.456E+10

S4

-1.589E+00

4.458E+00

-2.956E+01

2.700E+02

3.378E+02

-1.071E+04

3.765E+04

S5

-1.211E+00

-1.144E+00

1.425E+00

-5.399E+00

1.474E+01

1.591E+02

-2.993E+02

S6

-5.615E-01

2.807E-01

1.271E-02

4.042E-01

-1.369E-01

-3.744E-01

1.429E-01

S7

2.728E-02

-2.420E-01

2.662E-01

-4.916E-02

-6.599E-02

5.903E-02

-2.381E-02

S8

3.566E-01

-3.216E-01

8.184E-02

2.190E-03

1.020E-02

-1.206E-03

-2.352E-03

S9

-2.507E-01

1.066E-01

3.493E-02

-5.994E-02

1.955E-02

-7.237E-04

-3.883E-04

S10

-1.829E-01

6.138E-02

-1.246E-02

2.864E-03

-8.584E-04

-3.022E-04

1.169E-04

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height 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 inverse of radius r of curvature in table 9 above); k is the conic constant (given in table 9 above); ai is the correction coefficient of the i-n th order of the aspherical surface, and the higher order coefficients A4, A6, A8, a10, a12, a14, a16 of the respective lens surfaces S1 to S10 are shown in table 10.

The design data of the scanning lens 100 according to the fifth embodiment of the present application are given above, and the effective focal length EFL is 1.685mm, the maximum field angle FOV is 98.929 degrees, the total optical length TTL is 4.051mm, and the aperture F-number Fno is 8.175.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the entrance pupil diameter of the scanning lens satisfies: f/epd= 7.885.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the maximum image height of the scanning lens satisfies: f/imgh=0.769.

In one embodiment provided herein, the maximum field angle fov= 98.929 of the scan lens.

In one embodiment provided herein, f1/f= 27.355.

In one embodiment provided herein, f5/f= -3.725.

In one embodiment provided herein, (r51+r52)/(r51—r52) = 3.128.

In one embodiment provided herein, (dt32+dt42)/(f 4-f 3) =0.784.

In one embodiment provided herein, (sag51+sag52)/(sag11+sag12) = -3.138.

In one embodiment provided herein, f 1/f2345= 25.013.

Fig. 22 to 25 describe the optical performance of the scanning lens 100 designed in the fifth lens combination of the embodiment.

In the fifth embodiment, the scanning lens meets the requirements of large depth of field, small distortion and excellent scanning quality.

Example six

The scanning lens 100 according to an embodiment of the present application sequentially includes, from an object side to an image side: the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, and the fifth lens 105 are illustrated in fig. 26.

In accordance with the above relation, table 11 shows the effective focal length EFL, the maximum field angle FOV, the total optical length TTL, the F-number Fno, the surface type, the radius of curvature, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the sixth embodiment, wherein the units of the radius of curvature and the thickness are millimeter (mm), as shown in table 11:

TABLE 11

Table 12 shows the aspherical coefficients of the scanning lens 100 of the sixth embodiment of the present application, as shown in table 12:

table 12

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height 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 inverse of radius r of curvature in table 11 above); k is the conic constant (given in table 11 above); ai is the correction coefficient of the i-n th order of the aspherical surface, and the higher order coefficients A4, A6, A8, a10, a12, a14, and a16 of the respective lens surfaces S1 to S10 are shown in table 12.

The design data of the scanning lens 100 according to the sixth embodiment of the present application are given above, and the effective focal length EFL is 1.680mm, the maximum field angle FOV is 99.160 degrees, the total optical length TTL is 4.017mm, and the aperture F-number Fno is 8.138.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the entrance pupil diameter of the scanning lens satisfies: f/epd= 7.848.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the maximum image height of the scanning lens satisfies: f/imgh=0.752.

In one embodiment provided herein, the maximum field angle fov= 99.160 of the scan lens.

In one embodiment provided herein, f1/f= 23.457.

In one embodiment provided herein, f5/f= -2.300.

In one embodiment provided herein, (r51+r52)/(r51—r52) =1.790.

In one embodiment provided herein, (dt32+dt42)/(f 4-f 3) =0.567.

In one embodiment provided herein, (sag51+sag52)/(sag11+sag12) = -4.051.

In one embodiment provided herein, f 1/f2345= 21.380.

Fig. 27 to 30 describe the optical performance of the scanning lens 100 designed in the lens combination manner of the sixth embodiment.

In the sixth embodiment, the scanning lens satisfies the requirements of large depth of field, small distortion, and excellent scanning quality.

Example seven

The scanning lens 100 according to an embodiment of the present application sequentially includes, from an object side to an image side: the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, and the fifth lens 105 are illustrated in fig. 31.

In accordance with the above relation, table 13 shows the effective focal length EFL, the maximum field angle FOV, the total optical length TTL, the F-number Fno, the surface type, the radius of curvature, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the seventh embodiment, wherein the units of the radius of curvature and the thickness are millimeter (mm), as shown in table 13:

TABLE 13

Table 14 shows the aspherical coefficients of the scanning lens 100 of the seventh embodiment of the present application, as shown in table 14:

TABLE 14

Face number

A4

A6

A8

A10

A12

A14

A16

S1

3.321E-01

-3.250E-01

1.123E-01

7.993E-02

-5.062E-04

-5.100E-02

1.223E-02

S2

4.246E-01

-6.928E-01

-5.716E-01

4.908E+00

-7.444E+00

4.064E+00

-4.997E-01

S3

9.124E-02

-3.310E+01

-8.915E+02

3.941E+05

-3.179E+07

9.984E+08

-1.090E+10

S4

-1.657E+00

4.917E+00

-2.835E+01

2.587E+02

1.672E+02

-1.218E+04

2.938E+04

S5

-1.176E+00

-1.296E+00

7.925E-01

-5.796E+00

1.590E+01

1.659E+02

-2.769E+02

S6

-5.799E-01

2.925E-01

-5.238E-03

3.773E-01

-1.475E-01

-3.647E-01

1.925E-01

S7

4.104E-02

-2.296E-01

2.752E-01

-4.641E-02

-7.027E-02

4.756E-02

-4.456E-02

S8

3.612E-01

-3.217E-01

7.717E-02

4.000E-05

1.005E-02

-4.514E-04

-1.275E-03

S9

-2.604E-01

1.034E-01

3.420E-02

-6.022E-02

1.942E-02

-7.895E-04

-4.242E-04

S10

-1.699E-01

6.555E-02

-1.198E-02

2.875E-03

-8.648E-04

-3.011E-04

1.193E-04

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height 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 inverse of radius r of curvature in table 13 above); k is the conic constant (given in table 13 above); ai is the correction coefficient of the i-n th order of the aspherical surface, and the higher order coefficients A4, A6, A8, a10, a12, a14 and a16 of the respective lens surfaces S1 to S10 are shown in table 14.

The design data of the scanning lens 100 according to the seventh embodiment of the present application are given above, and the effective focal length EFL is 1.717mm, the maximum field angle FOV is 98.950 degrees, the total optical length TTL is 4.004mm, and the aperture F-number Fno is 8.191.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the entrance pupil diameter of the scanning lens satisfies: f/epd= 7.976.

In one embodiment provided herein, the ratio of the total effective focal length of the scanning lens to the maximum image height of the scanning lens satisfies: f/imgh=0.755.

In one embodiment provided herein, the maximum field angle fov= 98.950 of the scan lens.

In one embodiment provided herein, f1/f= 27.156.

In one embodiment provided herein, f5/f= -5.089.

In one embodiment provided herein, (r51+r52)/(r51—r52) = 4.168.

In one embodiment provided herein, (dt32+dt42)/(f 4-f 3) =0.604.

In one embodiment provided herein, (sag51+sag52)/(sag11+sag12) = -0.167.

In one embodiment provided herein, f 1/f2345= 25.001.

Fig. 32 to 35 describe the optical performance of the scanning lens 100 designed in the lens combination manner of the seventh embodiment.

In the seventh embodiment, the scanning lens satisfies the requirements of large depth of field, small distortion, and excellent scanning quality.

In addition, the f/EPD ratios, f/ImgH ratios, FOV values, f1/f ratios, f5/f ratios, (R51+R52)/(R51-R52) ratios, (DT 32+DT 42)/(f 4-f 3) ratios, (SAG51+SAG52)/(SAG11+SAG12) ratios, and f1/f2345 ratios corresponding to examples one to seven are shown in Table 23:

Table 23

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The invention is not to be limited by the specific embodiments disclosed herein and other embodiments are within the scope of the invention as defined by the claims of the present application.

Claims

1. The scanning lens is characterized by sequentially comprising, from an object side to an image side along an optical axis:

a first lens having positive optical power;

the scanning lens satisfies the following conditional expression:

6.71<f/EPD<8.70；

2. The scanning lens of claim 1, wherein the scanning lens satisfies the following conditional expression:

0.69<f/ImgH<0.89；

3. The scanning lens of claim 1, wherein the scanning lens satisfies the following conditional expression:

90°<FOV<110°；

wherein, FOV is the maximum field angle of the scanning lens.

4. The scanning lens of claim 1, wherein the scanning lens satisfies the following conditional expression:

23.3<f1/f<27.4；-5.09<f5/f<-2.30；

5. The scanning lens of claim 1, wherein the scanning lens satisfies the following conditional expression:

1.79<(R51+R52)/(R51-R52)<4.17；

6. The scanning lens of claim 1, wherein the scanning lens satisfies the following conditional expression:

0.53<(DT32+DT42)/(f4-f3)<0.78；

7. The scanning lens of claim 1, wherein the scanning lens satisfies the following conditional expression:

-4.05<(SAG51+SAG52)/(SAG11+SAG12)<0；

8. The scanning lens of claim 1, wherein the scanning lens satisfies the following conditional expression:

21.20<f1/f2345<25.01；

9. The scanning lens of claim 1, wherein the object side and image side of the first lens, the object side and image side of the second lens, the object side and image side of the third lens, the object side and image side of the fourth lens, and the object side and image side of the fifth lens are each coated with infrared radiation.

10. A scanning lens module comprising the scanning lens according to any one of claims 1 to 9.