Ultra-wide angle F-.theta. lens system
US4787723A · kind A · utility
8Cited by
1References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 15, 1986 |
| Grant date | Nov 29, 1988 |
| Priority date | — |
| Expiry date | Oct 15, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An ultra-wide angle f-.theta. lens system comprising, in the order from the light beam deflector side, a first lens component having positive power, a second lens component having negative power, and a third lens component having positive power, the ultra-wide angle f-.theta. lens system being arranged to have an ultra-wide scanning angle widened to .+-.45.degree. and exhibiting an imaging performance of laser beam waist close to the diffraction limit in spite of the fact that the f-.theta. lens system comprises a small number of lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.