Lens system
AssigneeHon Hai Precision Industry Co., Ltd.
InventorsKuo-Yen Liang, Chun-Hsiang Huang
Life of this patent
Estimating the term…
Abstract
A lens system includes, in order from the object side, a positive refractive power first lens, a positive refractive power second lens; and a negative refractive power third lens. Wherein the lens system satisfies the following conditions: (1) (|G1R2|−G1R1)/(|G1R2|+G1R1)<0.5; and (2) 0.2<G1R1/F<0.6, wherein, G1R1 is the radius of curvature of a surface of the first lens facing the object side of the lens system, G1R2 is the radius of curvature of the surface of the first lens facing the image side of the lens system, and F is a focal length of the lens system.
Claims18
A lens system comprising, in order from the object side:
- a positive refractive power first lens;
- a positive refractive power second lens;
- and
- a negative refractive power third lens,
- wherein the lens system satisfies the following conditions:
- (|G1R2|−G1R1)/(|G1R2|+G1R1)<0.5;
- (1)
- 0.2<G1R1/F<0.6;
- (2)
- 1<F1/F<1.5;
- (3)
- 1<F/G3R2<7;
- (4) and
- 0.5<h/D3<0.7, (5)
- wherein, G1R1 is the radius of curvature of a surface of the first lens facing the object side of the lens system, G1R2 is the radius of curvature of the surface of the first lens facing the image side of the lens system, F is a focal length of the lens system, F1 is a focal length of the first lens, G3R2 is the radius of curvature of a surface of the third lens facing the image side of the lens system, D3 is the effective lens radius of the third lens, and h is the distance from the optical axis to a point on the image-side surface of the third lens farthest from the first lens.
An device with image capturing function, comprising:
- a body;
- a lens module mounted on the body, the lens module comprising, in order from the object side:
- a positive refractive power first lens;
- a positive refractive power second lens;
- and
- a negative refractive power third lens,
- wherein the lens system satisfies the following conditions:
- (|G1R2|−G1R1)/(|G1R2|+G1R1)<0.5;
- (1)
- 0.2<G1R1/F<0.6;
- (2)
- 1<F1/F<1.5;
- (3)
- 1<F/G3R2<7;
- (4) and
- 0.5<h/D3<0.7, (5)
- wherein, G1R1 is the radius of curvature of a surface of the first lens facing the object side of the lens system, G1R2 is the radius of curvature of the surface of the first lens facing the image side of the lens system, F is a focal length of the lens system, F1 is a focal length of the first lens, G3R2 is the radius of curvature of a surface of the third lens facing the image side of the lens system, D3 is the effective lens radius of the third lens, and h is the distance from the optical axis to a point on the image-side surface of the third lens farthest from the first lens.
Dependencies are inferred from the claim text.