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Miniature low-distortion code scanning lens

A code-scanning and lens technology, applied in the lens field, can solve the problems of large difference between edge resolution and center resolution, large lens volume, too many lenses, etc. high rate effect

Pending Publication Date: 2022-02-01
XIAMEN LEADING OPTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the scanning lenses on the market generally have defects such as too many lenses, complex structures, large lens volume, large distortion, and large difference between edge resolution and center resolution.

Method used

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  • Miniature low-distortion code scanning lens
  • Miniature low-distortion code scanning lens
  • Miniature low-distortion code scanning lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] refer to figure 1 As shown, this embodiment discloses a miniature low-distortion code scanning lens, which sequentially includes a first lens 1, a second lens 2, and a third lens 3 along an optical axis from the object side A1 to the image side A2. The lens 1 to the third lens 3 each include an object side facing the object side A1 and allowing the imaging light to pass through, and an image side facing the image side A2 and allowing the imaging light to pass through;

[0067] The first lens 1 has a positive refractive power, the object side of the first lens 1 is convex, and the image side is concave, and the object side and the image side of the first lens 1 are both aspherical;

[0068] The second lens 2 has a negative refractive power, the object side of the second lens 2 is concave, and the image side is concave, and the object side and the image side of the second lens 2 are both aspherical;

[0069] The third lens 3 has a positive refractive power, the object si...

Embodiment 2

[0079] Cooperate Figure 5 to Figure 8 As shown, the concave-convex surface and refractive power of each lens in this embodiment and the first embodiment are roughly the same, and the optical parameters such as the radius of curvature of the lens surface and the thickness of the lens are different.

[0080] The detailed optical data of this specific embodiment is shown in Table 2.

[0081] The detailed optical data of table 2 embodiment two

[0082]

[0083] Please refer to the table below for detailed data on the parameters of the aspherical surfaces of the first lens 1 to the third lens 3:

[0084]

[0085]

[0086] In this specific embodiment, when the working object distance is 500mm, the focal length of the lens is f=4.3mm, FNO=5.0, the field of view FOV=54°, TTL<4.8mm, the maximum effective diameter of the lens is smaller than φ3.7mm, and the volume is small.

[0087] Please refer to the optical path diagram of the optical imaging lens in this specific embodim...

Embodiment 3

[0089] Cooperate Figure 9 to Figure 12 As shown, the concave-convex surface and refractive power of each lens in this embodiment and the first embodiment are roughly the same, and the optical parameters such as the radius of curvature of the lens surface and the thickness of the lens are different.

[0090] The detailed optical data of this specific embodiment is shown in Table 3.

[0091] The detailed optical data of table 3 embodiment three

[0092]

[0093] Please refer to the table below for detailed data on the parameters of the aspherical surfaces of the first lens 1 to the third lens 3:

[0094]

[0095] In this specific embodiment, when the working object distance is 500mm, the focal length of the lens is f=4.3mm, FNO=5.0, the field of view FOV=54°, TTL<4.8mm, the maximum effective diameter of the lens is smaller than φ3.7mm, and the volume is small.

[0096] Please refer to the optical path diagram of the optical imaging lens in this specific embodiment Fig...

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Abstract

The invention discloses a miniature low-distortion code scanning lens, which comprises a first lens, a second lens, a third lens, wherein each of the first lens, the second lens and the third lens comprises an object side surface and an image side surface; the first lens has a positive refractive index, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, and the object side surface and the image side surface of the first lens are aspheric surfaces; the second lens has a negative refractive index, the object side surface of the second lens is a concave surface, the image side surface of the second lens is a concave surface, and the object side surface and the image side surface of the second lens are aspheric surfaces; the third lens has a positive refractive index, the object side surface of the third lens is a convex surface, the image side surface of the third lens is a concave surface, and the object side surface and the image side surface of the third lens are aspheric surfaces. The code scanning lens has only three lenses with refractive indexes. The number of the lenses is small, the structure is simple, and the size of the lens is small; the distortion of the lens is controlled within 1%, and the impression of an imaging picture cannot be influenced by overlarge distortion; the imaging quality is good, and the difference between the resolution of the central field of view and the edge field of view is small.

Description

technical field [0001] The invention relates to the field of lens technology, in particular to a miniature low-distortion code-scanning lens. Background technique [0002] With the development of society, the two-dimensional code is more and more closely connected with people's life, and it is often used in mobile payment, identity verification, information acquisition, etc. The scanning of the two-dimensional code is through the scanning lens installed on the scanning terminal To complete, the user puts the graphic code displayed on the mobile terminal in the scanning window of the code scanning terminal, and the code scanning terminal scans the graphic code to complete the corresponding business. [0003] At present, the scanning lenses on the market generally have defects such as too many lenses, complex structures, large lens volume, large distortion, and large difference between edge resolution and center resolution. Contents of the invention [0004] The object of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B1/04G06F17/11G06K7/10
CPCG02B13/0035G02B1/041G06K7/10722G06K7/10831G06F17/11
Inventor 范智宇张荣曜李赐才陈嘉旺
Owner XIAMEN LEADING OPTICS