Optical scanning apparatus
US4998790A · kind A · utility
15Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1990 |
| Grant date | Mar 12, 1991 |
| Priority date | — |
| Expiry date | Feb 27, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/124
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical scanning apparatus has a semiconductor laser which produces a divergent beam of light. A collimator lens makes the beam of light parallel, a cylindrical lens shapes the beam, and a polygonal deflector deflects the beam through a scanning lens and onto a rotating drum containing an exposure plane. The amount of light reflected back into the semiconductor laser is reduced by forming a slit either inside of the collimator lens or inside of a housing of the cylindrical lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.