f-.theta. Lens system
US4401362A · kind A · utility
41Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1981 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Jul 13, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An f-.theta. lens system comprising the first lens element which is a positive lens, the second lens element which is a negative lens and the third lens element which is a positive lens. This lens system can be formed as a small lens of a wide angle and has a focusing ability close to the diffraction limit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.