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US 6,888,687 B2Granted
Photographic lens and camera module
AssigneeSeiko Epson Corporation
InventorsNoboru Ninomiya, Naohisa Yamaguchi, Eiki Matsuo
Life of this patent
Estimating the term…
Abstract
For a positive lens having a convex surface on an image side thereof and a diaphragm provided on an object side thereof, the following conditions are satisfied when a surface of the lens at least on the image side is aspheric, a focal length is f, a distance from the diaphragm to a front surface of the lens is D0, and a thickness of the lens is D1: 0.2<D0/f<0.8, 1.2<(D0+D1)/f, and 0.4<R2/f<1.0.
Claims7
A photographing lens comprising:
- a positive lens having a convex surface on an image side thereof;
- and
- a diaphragm provided on an object side of the positive lens;
- wherein, when a surface of the lens at least on the image side thereof is aspheric, a focal length is f, a distance from the diaphragm to a front surface of the lens is D0, and a thickness of the lens is D1:
- 0.2<D0/f<0.8
- 1.2<(D0+D1)/f
- 0.4<R2/f<1.0.
4 more elements
A photographing lens comprising:
- a positive lens having bi-convex surfaces;
- and
- a diaphragm provided on an object side of the positive lens;
- wherein, when a surface of the lens at least on an image side thereof is aspheric, a focal length is f, a distance from the diaphragm to a front surface of the lens is D0, a thickness of the lens is D1, a radius of curvature of the lens on the object side is R1, and a radius of curvature of the lens on the image side is R2:
- 0.2<D0/f<0.8
- 1.2<(D0+D1)/f
- 1.0<R1/R2<2.5.
4 more elements
A lens comprising:
- a positive lens having an aspheric convex surface on an image side thereof, a focal length f;
- and a thickness D1;
- and
- a diaphragm provided at a distance D0 from an object side surface of the positive lens;
- wherein:
- 0.2<D0/f<0.8;
- 1.2<(D0+D1)/f;
- and
- 0.4<R2/f<1.0.
6 more elements
Dependencies are inferred from the claim text.