CN114721122A

CN114721122A - Scanning lens and scanning lens module

Info

Publication number: CN114721122A
Application number: CN202210158929.1A
Authority: CN
Inventors: 廖仁泽; 王�锋; 周明明; 马庆鸿; 万良伟
Original assignee: Huizhou Xingjuyu Optical Co ltd
Current assignee: Huizhou Xingjuyu Optical Co ltd
Priority date: 2022-02-21
Filing date: 2022-02-21
Publication date: 2022-07-08
Anticipated expiration: 2042-02-21
Also published as: CN114721122B

Abstract

The invention discloses a scanning lens and a scanning lens module, belonging to the technical field of optical imaging, and sequentially comprising the following components from an object side to an image side along an optical axis: a first lens having a positive optical power; a second lens having a focal power, an image-side surface of which is convex near the optical axis; a third lens having a focal power, an object-side surface of which is convex near the optical axis; a fourth lens having a focal power, an image-side surface of which is convex near the optical axis; and a fifth lens having a negative refractive power, an image-side surface of which is concave near the optical axis; the scanning lens satisfies the following conditional expressions: 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 field curvature, the distortion and the 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 F/EPD < 6.71< 8.70 is satisfied, the scanning lens is favorable for obtaining a larger F number of the aperture, the depth of field range of the scanning lens is larger, and the accuracy of the scanning lens during scanning 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 electronic products is increasing, and the quality and demand for scanning lenses are also increasing. In the existing scanning lens, because the depth of field is small and the distortion is large, the scanning range of the lens is small, the scanned image-text is greatly deformed, the scanning result is easy to generate errors, even the scanning is not performed, and the scanning accuracy of the scanning lens is low.

Disclosure of Invention

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

In a first aspect, a scanning lens, in order from an object side to an image side along an optical axis, comprises:

a first lens having a positive optical power;

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

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

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

a fifth lens element having a negative refractive 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 meets the following conditional expression:

6.71<f/EPD<8.70；

wherein f is the total effective focal length of the scanning lens, and EPD is the entrance pupil diameter of the scanning 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 the 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, and R52 is a radius of curvature of the image-side surface of the fifth lens.

Optionally, the scanning lens satisfies the following conditional expression:

0.53<(DT32+DT42)/(f4-f3)<0.78；

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, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

Optionally, the scanning lens satisfies the following conditional expression:

-4.05<(SAG51+SAG52)/(SAG11+SAG12)<0；

the SAG51 is a distance on an optical axis from an intersection point of an object side surface of the fifth lens and an optical axis to an effective radius vertex of an object side surface of the fifth lens, the SAG52 is a distance on the optical axis from an intersection point of an image side surface of the fifth lens and the optical axis to an effective radius vertex of an image side surface of the fifth lens, the SAG11 is a distance on the optical axis from an intersection point of an object side surface of the first lens and the optical axis to an effective radius vertex of an object side surface of the first lens, and the SAG12 is a distance on the optical axis from an intersection point of an image side surface of the first lens and the optical axis to an effective radius vertex of an 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 and the image side of the first lens, the object side and the image side of the second lens, the object side and the image side of the third lens, the object side and the image side of the fourth lens and the object side and the image side of the fifth lens are plated with infrared films.

In a second aspect, a scanning lens module is provided, which includes the 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 field curvature, the distortion and the 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 F/EPD < 6.71< 8.70 is satisfied, the scanning lens can obtain a larger F number of the aperture, the depth of field of the scanning lens is enlarged, 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 structural diagram of a scanning lens according to a first embodiment of the present application;

fig. 2 is a spherical aberration curve chart of the scanning lens according to the first embodiment of the present application;

fig. 3 is a graph of astigmatism of a scanning lens according to a first embodiment of the present application;

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

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

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

fig. 7 is a spherical aberration curve chart of a scanning lens according to a second embodiment of the present application;

fig. 8 is an astigmatism graph 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 graph of chromatic aberration of magnification of a scanning lens according to a second embodiment of the present application;

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

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

fig. 13 is an astigmatism graph of a scanning lens according to a third embodiment of the present application;

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

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

fig. 16 is a schematic structural view of a scanning lens according to a fourth embodiment of the present application;

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

fig. 18 is an astigmatism graph of a scanning lens according to a fourth embodiment of the present application;

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

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

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

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

fig. 23 is an astigmatism graph of a scanning lens according to a fifth embodiment of the present application;

fig. 24 is a distortion graph of a scanning lens according to a fifth embodiment of the present application;

fig. 25 is a graph of chromatic aberration of magnification of a scanning lens according to a fifth embodiment of the present application;

fig. 26 is a schematic structural view of a scanning lens of a sixth embodiment of the present application;

fig. 27 is a spherical aberration diagram of a scanning lens according to a sixth embodiment of the present application;

fig. 28 is an astigmatism graph of a scanning lens according to a sixth embodiment of the present application;

fig. 29 is a distortion graph of a scanning lens according to a sixth embodiment of the present application;

fig. 30 is a graph showing a chromatic aberration of magnification of a scanning lens according to a sixth embodiment of the present application;

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

fig. 32 is a spherical aberration diagram of a scanning lens according to a seventh embodiment of the present application;

fig. 33 is an astigmatism graph of a scanning lens according to a seventh embodiment of the present application;

fig. 34 is a distortion graph of a scanning lens according to a seventh embodiment of the present application;

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

In the figure:

100. scanning a lens; 101. a first lens; 102. a second lens; 103. a third lens; 104. a fourth lens; 105. a fifth lens; 106. an optical 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 convenience of understanding, technical terms related to 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 diaphragm 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 object-side surface of the fifth lens;

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 on the optical axis from the intersection point of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens;

SAG12 is the distance on the optical axis from the intersection point of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface 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 effective radius vertex of the object side surface of the fifth lens;

SAG52 is the distance on the optical axis from the intersection point of the image side surface of the fifth lens and the optical axis to the effective radius vertex 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 scanning lens 100 is defined as the object side (hereinafter also referred to as the object side), the surface of the lens facing the object side may be referred to as the object side surface, the surface of the lens facing the object side may be referred to as the surface of the lens near the object side, the right side of the scanning lens 100 is defined as the image side (hereinafter also referred to as the image side), the surface of the lens facing the image side may be referred to as the image side surface, and the image side surface may be referred to as the surface of the lens near the image side. The scanning lens 100 of the embodiment of the present application, from an object side to an image side, sequentially includes: a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, and a fifth lens 105; a diaphragm may also be disposed between the first lens 101 and the second lens 102. An image sensor 107, such as a CCD, CMOS, etc., may also be disposed after the fifth lens 105. A filter 106, such as a flat infrared cut filter or the like, 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, the embodiment of the present application defines a representation form of relevant parameters of the scan lens, for example, TTL represents a distance from an object side surface of the first lens to an image plane of the scan lens on an optical axis; ImgH represents the maximum image height of the scanning lens, and the letter representation of similar definition is only schematic, but may be represented in other forms, and the application is not limited in any way.

It should be noted that the units of the parameters related to the ratio in the following relational expression are consistent, for example, the units of numerator are millimeters (mm), and the units of denominator are also millimeters (mm).

The positive and negative of the curvature radius indicate 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 surface or the image side surface) is convex toward the object side, the curvature radius of the optical surface is a positive value; 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, and the radius of curvature of the optical surface is negative.

It should be noted that the shape of the lens, and the degree of the concave-convex of the object side surface and the image side surface in the drawings are only schematic, and do not limit the embodiments of the present application. In this application, the material of the lens may be resin (resin), plastic (plastic), or glass (glass). The lens comprises 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-focus lens or a long-focus lens.

Referring to fig. 1, a dotted line in fig. 1 is used to indicate an optical axis of the lens.

The scanning lens system 100 of the present application, in order from an object side to an image side, includes: 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 "respective lenses of the optical imaging lens" refer to lenses constituting 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 the embodiments of the present application,

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

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

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

the fourth lens 104 may have positive optical power, the object side surface S7 of the fourth lens 104 being convex near the optical axis, the image side surface S8 of the fourth lens 104 being convex near the optical axis;

the fifth lens 105 may have negative optical power, with 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 combination configuration of the lenses is beneficial to correcting curvature of field, distortion and high-order aberration of the scanning lens, and the imaging quality of the scanning lens is improved.

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

The above relation specifies that 6.71< F/EPD <8.70, preferably 6.71< F/EPD <7.85, which is beneficial for the scanning lens to obtain a larger F number of the aperture, 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 relational expression 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, a more appropriate image plane is matched 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 °.

The above relational expression defines 90 ° < FOV <110 °, preferably 90 ° < FOV <99.2 °, and controls the maximum field angle within a wide range, thereby ensuring that the scanning lens has a wide scanning range and improving the scanning efficiency.

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.

The above relation specifies 23.3< f1/f <27.4, -5.09< f5/f < -2.30; preferably 25< f1/f <27, -5< f5/f < -3.2, and reasonably distributes the optical power of the first lens and the optical power of the fifth lens, so that the scanning lens obtains 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 relation is defined as 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 the 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< (DT32+ DT42)/(f4-f3) < 0.78.

The above relation defines 0.53< (DT32+ DT42)/(f4-f3) <0.78, preferably 0.53< (DT32+ DT42)/(f4-f3) <0.68, which is beneficial to 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。

the above relation specifies-4.05 < (SAG51+ SAG52)/(SAG11+ SAG12) <0, preferably

4.05< (SAG51+ SAG52)/(SAG11+ SAG12) < -0.17, and the first lens and the fifth lens are prevented from being too bent, so that the forming and assembling of the lenses in the optical imaging lens are facilitated, and the reliability of the scanning lens in use is improved.

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

The above relation specifies 21.20< f1/f2345<25.01, preferably 23.1< f1/f2345<25.0, and the optical 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 scanning lens can obtain better balanced aberration, and simultaneously, the resolving power of the scanning lens can be improved, and the scanning quality of the scanning lens can be improved.

In some implementation manners 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 coated with infrared films, so that when a scanning environment of the scanning lens is dark, visible light and infrared rays can enter the lens, the scanning lens is guaranteed 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, which includes the scanning lens in any one of the 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, non-limiting examples of embodiments of the present application will be described in more detail below in conjunction with fig. 1-35.

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

Example one

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

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

In light of the above relations, 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 curvature radius, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the first embodiment, where the curvature radius and the thickness are both in millimeters (mm), as shown in table 1:

TABLE 1

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

TABLE 2

Flour mark

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

Wherein the non-curved surface of each lens of the image pickup optical lens 100 satisfies:

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 being 1/r (i.e., paraxial curvature c is the inverse of radius of curvature r in table 1 above); k is the conic constant (given in table 1 above); ai is a correction coefficient of the i-n th order of the aspherical surface, and the high-order term coefficients A4, A6, A8, A10, A12, A14 and A16 of the respective lens surfaces S1-S10 are shown in Table 2.

It should be understood that the aspheric surfaces of the lenses in the scanning lens 100 may use the aspheric surface shown in the above aspheric surface formula, and may also use other aspheric surface formulas, which are not limited in this application.

Given the design data of the scanning lens 100 according to the first embodiment of the present application, 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 F-stop Fno is 6.848.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to an entrance pupil diameter of the scanning lens satisfies: 6.715 f/EPD.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to a maximum image height of the scanning lens satisfies: f/ImgH is 0.824.

In one embodiment provided by the present application, the maximum field angle FOV of the scanning lens is 99.210.

In one embodiment provided herein, f1/f 27.081.

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

In one example provided herein, (R51+ R52)/(R51-R52) is 3.498.

In one example provided herein, (DT32+ DT42)/(f4-f3) is 0.587.

In one example provided herein, (SAG51+ SAG52)/(SAG11+ SAG12) ═ 3.997.

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

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

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

Example two

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

In light of the above relations, 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 curvature radius, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the second embodiment, where the curvature radius and the thickness are both in millimeters (mm), as shown in table 3:

TABLE 3

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

TABLE 4

Flour mark

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 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 being 1/r (i.e., paraxial curvature c is the inverse of radius of curvature r in table 3 above); k is the conic constant (given in table 3 above); ai is a correction coefficient of the i-n th order of the aspherical surface, and the coefficients of the high-order terms a4, a6, A8, a10, a12, a14, and a16 of the respective lens surfaces S1 through S10 are shown in table 4.

Given the design data of the scanning lens 100 according to the second embodiment of the present application, 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 F-stop value Fno is 9.241.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to an entrance pupil diameter of the scanning lens satisfies: 8.696 f/EPD.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to a maximum image height of the scanning lens satisfies: f/ImgH is 0.788.

In one embodiment provided by the present application, the maximum field angle FOV of the scanning lens is 98.970.

In one embodiment provided herein, f1/f 23.312.

In one embodiment provided herein, f 5/f-3.207.

In one example provided herein, (R51+ R52)/(R51-R52) is 3.104.

In one example provided herein, (DT32+ DT42)/(f4-f3) is 0.686.

In one example provided herein, (SAG51+ SAG52)/(SAG11+ SAG12) ═ 2.893.

In one embodiment provided herein, f1/f2345 is 21.200.

Fig. 7 to 10 illustrate the optical performance of the scanning lens 100 designed in such a lens combination 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 system 100 of an embodiment of the present application, in order from an object side to an image side, includes: first lens 101, second lens 102, third lens 103, fourth lens 104, and fifth lens 105, as shown in fig. 11.

In light of the above relations, 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 curvature radius, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the third embodiment, where the curvature radius and the thickness are both in millimeters (mm), as shown in table 5:

TABLE 5

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

TABLE 6

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 being 1/r (i.e., paraxial curvature c is the inverse of radius of curvature r in table 5 above); k is the conic constant (given in table 5 above); ai is a correction coefficient of the i-n th order of the aspherical surface, and the coefficients of the high-order terms a4, a6, A8, a10, a12, a14, and a16 of the respective lens surfaces S1 through S10 are shown in table 6.

Given the design data of the scanning lens 100 according to the third embodiment of the present application, 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 F-stop value Fno is 8.105.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to an entrance pupil diameter of the scanning lens satisfies: 7.850 for f/EPD.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to a maximum image height of the scanning lens satisfies: f/ImgH is 0.890.

In one embodiment provided by the present application, the maximum field angle FOV of the scanning lens is 90.004.

In one embodiment provided herein, f1/f 25.343.

In one embodiment provided herein, f 5/f-3.743.

In one example provided herein, (R51+ R52)/(R51-R52) ═ 3.140.

In one example provided herein, (DT32+ DT42)/(f4-f3) is 0.533.

In one example provided herein, (SAG51+ SAG52)/(SAG11+ SAG12) — 0.004.

In one embodiment provided herein, f1/f2345 is 23.213.

Fig. 12 to 15 illustrate the optical performance of the scanning lens 100 designed in such a lens combination as the third embodiment.

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

Example four

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

For convenience of description, in the following embodiments, STO denotes a surface of a diaphragm, S1 denotes an object side surface of the first lens 101, S2 denotes an image side surface of the first lens 101, S3 denotes an object side surface of the second lens 102, S4 denotes an image side surface of the second lens 102, S5 denotes an object side surface of the third lens 103, S6 denotes an image side surface of the third lens 103, S7 denotes an object side surface of the fourth lens 104, S8 denotes an image side surface of the fourth lens 104, S9 denotes an object side surface of the fifth lens 105, S10 denotes an image side surface of the fifth lens 105, S11 denotes an object side surface of the infrared filter, S12 denotes an image side surface of the infrared filter, and S13 denotes an image forming surface. TTL denotes an optical total length of the scan lens 100, ImgH denotes a maximum image height of the scan lens 100, and EFL denotes an effective focal length of the scan lens 100. The ith order aspheric coefficients are represented by α i, i is 4, 6, 8, 10, 12, 14, 16, and the cone coefficients are represented by K.

In light of the above relations, 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 curvature radius, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the fourth embodiment, where the curvature radius and the thickness are both in millimeters (mm), as shown in table 7:

TABLE 7

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

TABLE 8

Flour mark

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 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 being 1/r (i.e., paraxial curvature c is the inverse of radius of curvature r in table 7 above); k is the conic constant (given in table 7 above); ai is a correction coefficient of the i-n th order of the aspherical surface, and the high-order coefficients a4, a6, A8, a10, a12, a14, and a16 of the respective lens surfaces S1 to S10 are shown in table 8.

It should be understood that the aspheric surfaces of the lenses in the scanning lens 100 may use the aspheric surface shown in the above aspheric surface formula, and may also use other aspheric surface formulas, which is not limited in this application.

Given the design data of the scanning lens 100 according to the fourth embodiment of the present application, 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 F-stop value Fno is 8.009.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to an entrance pupil diameter of the scanning lens satisfies: 7.746 f/EPD.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to a maximum image height of the scanning lens satisfies: f/ImgH is 0.690.

In one embodiment provided by the present application, the maximum field angle FOV of the scanning lens is 109.997.

In one embodiment provided herein, f1/f 25.073.

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

In one example provided herein, (R51+ R52)/(R51-R52) ═ 3.030.

In one example provided herein, (DT32+ DT42)/(f4-f3) is 0.663.

In one example provided herein, (SAG51+ SAG52)/(SAG11+ SAG12) ═ 2.482.

In one embodiment provided herein, f1/f2345 is 23.124.

Fig. 17 to 20 illustrate the optical performance of the scanning lens 100 designed in the four lens combinations of the embodiment.

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

EXAMPLE five

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

In light of the above relations, 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 curvature radius, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the fifth embodiment, where the curvature radius and the thickness are both in millimeters (mm), as shown in table 9:

TABLE 9

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

watch 10

Flour mark

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 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 being 1/r (i.e., paraxial curvature c is the inverse of radius of curvature r in table 9 above); k is the conic constant (given in table 9 above); ai is a correction coefficient of the i-n th order of the aspherical surface, and the high-order coefficients a4, a6, A8, a10, a12, a14, and a16 of the respective lens surfaces S1 to S10 are shown in table 10.

Given the design data of the scanning lens 100 according to the fifth embodiment of the present application, 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 F-number Fno of the aperture is 8.175.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to an entrance pupil diameter of the scanning lens satisfies: 7.885 f/EPD.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to a maximum image height of the scanning lens satisfies: f/ImgH ═ 0.769.

In one embodiment provided by the present application, the maximum field angle FOV of the scanning lens is 98.929.

In one embodiment provided herein, f1/f 27.355.

In one embodiment provided herein, f 5/f-3.725.

In one example provided herein, (R51+ R52)/(R51-R52) ═ 3.128.

In one example provided herein, (DT32+ DT42)/(f4-f3) is 0.784.

In one example provided herein, (SAG51+ SAG52)/(SAG11+ SAG12) ═ 3.138.

In one embodiment provided herein, f1/f2345 ═ 25.013.

Fig. 22 to 25 illustrate the optical performance of the scanning lens 100 designed in such a lens combination as described in example five.

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, in order from an object side to an image side, includes: first lens 101, second lens 102, third lens 103, fourth lens 104, and fifth lens 105, as shown in fig. 26.

In light of the above relations, 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 curvature radius, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the sixth embodiment, where the curvature radius and the thickness are both in millimeters (mm), as shown in table 11:

TABLE 11

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

TABLE 12

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 being 1/r (i.e., paraxial curvature c is the inverse of radius of curvature r in table 11 above); k is the conic constant (given in table 11 above); ai is a correction coefficient of the i-n th order of the aspherical surface, and high-order coefficient coefficients A4, A6, A8, A10, A12, A14 and A16 of the respective lens surfaces S1 to S10 are shown in Table 12.

Given the design data of the scanning lens 100 according to the sixth embodiment of the present application, 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 F-stop value Fno is 8.138.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to an entrance pupil diameter of the scanning lens satisfies: 7.848 f/EPD.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to a maximum image height of the scanning lens satisfies: f/ImgH is 0.752.

In one embodiment provided by the present application, the maximum field angle FOV of the scanning lens is 99.160.

In one embodiment provided herein, f1/f 23.457.

In one embodiment provided herein, f 5/f-2.300.

In one example provided herein, (R51+ R52)/(R51-R52) is 1.790.

In one example provided herein, (DT32+ DT42)/(f4-f3) is 0.567.

In one example provided herein, (SAG51+ SAG52)/(SAG11+ SAG12) ═ 4.051.

In one embodiment provided herein, f1/f2345 is 21.380.

Fig. 27 to 30 illustrate the optical performance of the scanning lens 100 designed in such a lens combination as six embodiments.

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

EXAMPLE seven

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

In light of the above relations, table 13 shows the effective focal length EFL, the maximum field angle FOV, the total optical length TTL, the aperture F value Fno, the surface type, the curvature radius, the thickness, the refractive index of the material, and the conic coefficient of the scanning lens 100 in the seventh embodiment, where the units of the curvature radius and the thickness are millimeters (mm), as shown in table 13:

watch 13

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

TABLE 14

Flour mark

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 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, where c is 1/r (i.e., paraxial curvature c is the inverse of radius of curvature r in table 13 above); k is the conic constant (given in table 13 above); ai is a correction coefficient of the i-n th order of the aspherical surface, and the high-order coefficients a4, a6, A8, a10, a12, a14, and a16 of the respective lens surfaces S1 to S10 are shown in table 14.

Given the design data of the scanning lens 100 according to the seventh embodiment of the present application, 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 F-stop Fno is 8.191.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to an entrance pupil diameter of the scanning lens satisfies: 7.976 f/EPD.

In one embodiment provided by the present application, a ratio of a total effective focal length of the scanning lens to a maximum image height of the scanning lens satisfies: f/ImgH equals 0.755.

In one embodiment provided by the present application, the maximum field angle FOV of the scanning lens is 98.950.

In one embodiment provided herein, f1/f 27.156.

In one embodiment provided herein, f 5/f-5.089.

In one example provided herein, (R51+ R52)/(R51-R52) ═ 4.168.

In one example provided herein, (DT32+ DT42)/(f4-f3) 0.604.

In one example provided herein, (SAG51+ SAG52)/(SAG11+ SAG12) — 0.167.

In one embodiment provided herein, f1/f2345 is 25.001.

Fig. 32 to 35 illustrate the optical performance of the scanning lens 100 designed in such a lens combination as described in the seventh embodiment.

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

In addition, the f/EPD ratio, f/ImgH ratio, FOV value, f1/f ratio, f5/f ratio, (R51+ R52)/(R51-R52) ratio, (DT32+ DT42)/(f4-f3) ratio, (SAG51+ SAG52)/(SAG11+ SAG12) ratio, f1/f2345 ratio corresponding to examples one to seven are shown in table 23:

TABLE 23

While the invention has been described with reference to preferred embodiments, 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 to the specific embodiments disclosed herein, but to other embodiments falling within the scope of the claims of the present application.

Claims

1. A scanning lens, in order from an object side to an image side along an optical axis, comprising:

a first lens having a positive optical power;

the scanning lens meets 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 the 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 surfaces of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are coated with infrared films.

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