Dual focal length lens system
US7764440B2 · kind B2 · utility
11Cited by
17References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2007 |
| Grant date | Jul 27, 2010 |
| Priority date | — |
| Expiry date | Nov 27, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B17/0896
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A dual focal length optical system includes a first optical system and a second optical system. The first optical system is positioned along an optical axis and includes an optical structure having an object side surface and an image side surface. The object side surface and the image side surface include a refractive surface portion and a reflective surface portion. The first optical system has a focal length. The second optical system is positioned on the same optical axis and has a focal length. The focal length of the first optical system is longer than the focal length of the second optical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.