Optical scanning device, image forming apparatus and liquid crystal device driving method
US7403316B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 11, 2005 |
| Grant date | Jul 22, 2008 |
| Priority date | — |
| Expiry date | Sep 18, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/123
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical scanning device includes: a light source; a deflector deflecting light beam from the light source; a coupling lens carrying out coupling of the light beam from the light source; a first optical system leading the light beam from the coupling lens to the deflector; a scanning optical system leading the light beam deflected by the deflector to a to-be-scanned surface; and a phase-modulatable liquid crystal device disposed on a light path lying from the light source through the to-be-scanned surface and driven by an electric signal, wherein: the first optical system at least comprises an optical device having: a surface having power positive in a sub-scanning direction; and a surface having power positive in a main scanning direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.