Device for scanning a light beam at a constant speed
US4179183A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1978 |
| Grant date | Dec 18, 1979 |
| Priority date | — |
| Expiry date | May 3, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/125
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light beam scanning device provided with a light source section to emit a scanning beam, a deflector to deflect the light beam from the light source section at a constant angular speed in a predetermined direction, and a lens system to focus the scanning beam deflected by the deflector on a scanning surface, wherein the lens system consists of two single lenses which are mutually positioned at a finite distance, the single lens at the side of the deflector has a negative refractive power, the single lens at the side of the scanning surface has a positive refractive power, and the scanning beam moves at a constant speed on the surface to be scanned due to the lens system having the f-.theta. characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.