US 12,681,271 B2Granted

Lens assembly

AssigneesSintai Optical (Shenzhen) Co., Ltd., Asia Optical Co., Inc.

InventorsBo-Yan Chen, Hsi-Ling Chang

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Abstract

A lens assembly includes a first lens, a second lens, a third lens, a first reflective element, and a second reflective element. The first lens is with positive refractive power. The first reflective element includes a first surface, a second surface, and a third surface, wherein the first surface and the third lens are opposite to each other. The second reflective element includes a fourth surface, a fifth surface, and a sixth surface, wherein the fourth surface and the third surface are opposite to each other. The first lens, the second lens, the third lens, and the first reflective element are arranged in order from an object side along a first axis. The first reflective element and the second reflective element are arranged in order along a second axis. The second reflective element and an image plane are arranged in order along a third axis.

A lens assembly comprising:

a first lens which is with positive refractive power;
a second lens which is with refractive power;
a third lens which is with refractive power;
a first reflective element;
and
a second reflective element;
wherein the first reflective element comprises a first surface, a second surface, and a third surface, and the first surface and the third lens are opposed to each other;
wherein the second reflective element comprises a fourth surface, a fifth surface, and a sixth surface, and the fourth surface and the third surface opposed to each other;
wherein the first lens, the second lens, the third lens, and the first reflective element are arranged in order from an object side along a first axis;
wherein the first reflective element and the second reflective element are arranged in order along a second axis;
wherein the second reflective element and an image plane are arranged in order along a third axis;
wherein the first axis and the second axis intersect perpendicularly at a point, the second axis and the third axis do not intersect perpendicularly at another point, and the extension lines of the first axis and the third axis do not perpendicularly intersect at yet another point;
wherein the first lens comprises a concave surface facing the first surface;
wherein the lens assembly satisfies at least one of following conditions:
34
⁢
mm
2
<
f
×
(
T
⁢
1
+
T
⁢
2
+
T
⁢
3
)
<
44
⁢
mm
2
;
9
<
TTL
/
(
T
⁢
1
+
T
⁢
2
+
T
⁢
3
)
<
10
;
9.5
<
f
⁢
1
/
T
⁢
1
<
39.5
;
1.2
<
(
f
+
TTL
)
/
f
⁢
1
<
4.1
;
55
⁢
mm
2
<
D
⁢
1
⁢
IMG
×
f
⁢
1
<
158
⁢
mm
2
;
17
<
f
/
T
⁢
1
<
30
;
44
<
(
R
⁢
11
+
R
⁢
12
)
/
T
⁢
1
<
63
;
wherein f is an effective focal length of the lens assembly, f1 is an effective focal length of the first lens, T1 is an interval from an object side surface of the first lens to an image side surface of the first lens along the first axis, T2 is an interval from an object side surface of the second lens to an image side surface of the second lens along the first axis, T3 is an interval from an object side surface of the third lens to an image side surface of the third lens along the first axis, TTL is an interval from the object side surface of the first lens to the image plane along the first axis, the second axis and the third axis respectively, D1IMG is an optical effective diameter of the image side surface of the first lens, R11 is a radius of curvature of the object side surface of the first lens, and R12 is a radius of curvature of the image side surface of the first lens.

132 more elements

Abstract

Claims20