Lens assembly
AssigneesSintai Optical (Shenzhen) Co., Ltd., Asia Optical Co., Inc.
InventorJian-Wei Lee
Life of this patent
Estimating the term…
Abstract
A lens assembly includes a first lens, a second lens, a third lens, and a fourth lens. The first lens is with negative refractive power. The second lens is with positive refractive power. The third lens is with refractive power. The fourth lens is with refractive power. The first lens, the second lens, the third lens, and the fourth lens are arranged in order from an object side to an image side along an optical axis. The lens assembly satisfies at least one of the following conditions: 3≤f3/f≤5.5; 0.2≤f/AAG≤0.3; 0.72≤f/BFL≤1.04.
Claims20
A lens assembly comprising:
- a first lens with negative refractive power;
- a second lens with positive refractive power;
- a third lens with refractive power;
- and
- a fourth lens with refractive power;
- wherein the first lens, the second lens, the third lens, and the fourth lens are arranged in order from an object side to an image side along an optical axis;
- wherein the lens assembly satisfies at least one of the following conditions:
- 3
- ≤
- f
-
- 3
- /
- f
- ≤
- 5.5
- ;
- 2.3
- ≤
- TTL
- /
- T
-
- 1
- ≤
- 2.65
- ;
- wherein f is an effective focal length of the lens assembly, f3 is an effective focal length of the third lens, TTL is an interval from an object side surface of the first lens to an image plane along the optical axis, and T1 is an interval from an image side surface of the first lens to an object side surface of the second lens along the optical axis.
A lens assembly comprising:
- a first lens with negative refractive power;
- a second lens with positive refractive power;
- a third lens with positive refractive power and comprises a convex surface facing an object side and a concave surface facing an image side;
- and
- a fourth lens with refractive power;
- wherein the first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side to the image side along an optical axis;
- wherein the lens assembly satisfies at least one of the following conditions:
- 3
- ≤
- f
-
- 3
- /
- f
- ≤
- 5.5
- ;
- 0.2
- ≤
- f
- /
- AAG
- ≤
- 0.3
- ;
- 0.72
- ≤
- f
- /
- BFL
- ≤
- 1.04
- ;
- wherein f is an effective focal length of the lens assembly, f3 is an effective focal length of the third lens, AAG is a sum of all air intervals from an image side surface of the first lens to an object side surface of the fourth lens along the optical axis, and BFL is an interval from an image side surface of the fourth lens to an image plane along the optical axis.
A lens assembly comprising:
- a first lens with negative refractive power;
- a second lens with positive refractive power;
- a third lens with refractive power;
- and
- a fourth lens is a meniscus lens with positive refractive power and comprises a convex surface facing an object side and a concave surface facing an image side;
- wherein the first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side to the image side along an optical axis;
- wherein the lens assembly satisfies at least one of the following conditions:
- 3
- ≤
- f
-
- 3
- /
- f
- ≤
- 5.5
- ;
- 0.2
- ≤
- f
- /
- AAG
- ≤
- 0.3
- ;
- 0.72
- ≤
- f
- /
- BFL
- ≤
- 1.04
- ;
- wherein f is an effective focal length of the lens assembly, f3 is an effective focal length of the third lens, AAG is a sum of all air intervals from an image side surface of the first lens to an object side surface of the fourth lens along the optical axis, and BFL is an interval from an image side surface of the fourth lens to an image plane along the optical axis.
Dependencies are inferred from the claim text.