Image pick-up lens system
US7321475B2 · kind B2 · utility
1Cited by
11References
6Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Sep 30, 2004 |
| Grant date | Jan 22, 2008 |
| Priority date | — |
| Expiry date | Nov 17, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/003
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image pick-up lens system includes an aperture stop (10), a biconvex first lens (20), and a meniscus-shaped second lens (30) having a concave surface on a side of an object. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. Each of the lenses has at least one aspheric surface, and the following conditions are satisfied: (1) 0.5<f1/f<0.9, and (2) 1<T/f<1.62, wherein f1 is a focal length of the first lens, f is a focal length of the system, and T is a length from the aperture stop to an image pick-up surface of the image side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.