Fixed-focus lens
First Claim
1. A fixed-focus lens, disposed between a magnified side and a minified side and having an optical axis;
- the fixed-focus lens comprising;
a reflective system, disposed between the magnified side and the minified side, wherein the reflective system comprises a reflection mirror having a negative refractive power; and
a refractive system, disposed between the reflection mirror and the minified side and comprising;
a first lens group, having a positive refractive power; and
a second lens group, disposed between the first lens group and the minified side and having a positive refractive power,wherein the fixed-focus lens satisfies F/H>
0.23, where F is an effective focal length and H is an image height.
1 Assignment
0 Petitions
Accused Products
Abstract
A fixed-focus lens disposed between a magnified side and a minified side. The fixed-focus lens has an optical axis and includes a reflective system and a refractive system. The reflective system includes a reflection mirror with a negative refractive power. The refractive system is disposed between the reflection mirror and the minified side and includes a first lens group and a second lens group. The first lens group has a positive refractive power. The second lens group is disposed between the first lens group and the minified side, and has a positive refractive power. The fixed-focus lens satisfies F/H>0.23, where F is an effective focal length and H is an image height.
20 Citations
18 Claims
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1. A fixed-focus lens, disposed between a magnified side and a minified side and having an optical axis;
- the fixed-focus lens comprising;
a reflective system, disposed between the magnified side and the minified side, wherein the reflective system comprises a reflection mirror having a negative refractive power; and a refractive system, disposed between the reflection mirror and the minified side and comprising; a first lens group, having a positive refractive power; and a second lens group, disposed between the first lens group and the minified side and having a positive refractive power, wherein the fixed-focus lens satisfies F/H>
0.23, where F is an effective focal length and H is an image height. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- the fixed-focus lens comprising;
Specification