IP Library › Granted Patent US 12693496
Granted Patent B2
US 12693496 · App. 18/538,208 · Granted Jul 28, 2026

4P lens for scanner gun with long depth of field

Inventor: Keyu Chai (Yichang, CN)
Assignee: Hubei Huaxin Photoelectric Co., Ltd.
G02B9/34
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Quick Facts
Patent No.
US 12693496
App. No.
18/538,208
Granted
Jul 28, 2026
Kind
B2
Abstract

A 4P lens for scanner gun with a long depth of field, comprising a first lens, a second lens, an aperture stop, a third lens and a fourth lens along the optical axis from the object side to the image side, the first lens is a negative lens, with a convex surface facing the object side and a concave surface facing the image side, the second lens is a positive lens, with a convex surface facing the object side, and the third lens is a positive lens, with a concave surface facing the object side and a convex surface facing the image side, the fourth lens is a positive lens, with a concave surface facing the object side and a convex surface facing the image side; the focal length of the first lens is f 1 , and the total focal length of the lens is f, which meets following condition: 1.4<f 1 /f<1.7.

Claims (75)

1 . A 4P lens for scanner gun with a long depth of field, comprising: a first lens, a second lens, an aperture stop, a third lens, and a fourth lens along an optical axis from an object side to an image side, wherein the first lens is a positive lens, with a convex surface facing the object side and a concave surface facing the image side, the second lens is a positive lens, with a convex surface facing the object side, and the third lens is a negative lens, with a concave surface facing the object side and a convex surface facing the image side, the fourth lens is a negative lens, with a concave surface facing the object side and a convex surface facing the image side;

wherein a focal length of the first lens is f 1 , and a total focal length of the lens is f, which meets a following condition:

1.4

<

f

⁢

1

/

f

<

1.7

;

wherein a following condition is met between a core thickness P 3 of the third lens and the total focal length f of the lens:

0.11

<

P

⁢

3

/

f

<

0.15

;

wherein a following condition is met between a core thickness P 4 of the fourth lens and the total focal length f of the lens:

0.16

<

P

⁢

4

/

f

<

0.17

;

wherein a radius of curvature of a first surface of the third lens is P 3 R 1 , and the following conditions are satisfied between it and the total focal length f of the lens:

0.33

<

P

⁢

3

⁢

R

⁢

1

/

f

<

0.38

;

wherein the first surface is an object-side surface.

2 . The 4P lens for scanner gun with a long depth of field according to claim 1 , wherein a combined focal length of the third lens and the fourth lens is f 34 and a following condition is met between it and the total focal length of the lens:

0.06

<

❘

f

/

f

⁢

34

❘

<

1.11

.

3 . The 4P lens for scanner gun with a long depth of field according to claim 1 , wherein a distance from a center of the first lens to the image side of the first lens is a total optical length TTL of the lens, and a following condition is met between the total optical length TTL and the core thickness 1 P 4 of the fourth lens:

0.11

<

P

⁢

4

/

TTL

<

0.12

.

wherein the TTL refers to a distance from a center point of an optical axis of the first lens to an imaging plane.