Optical scanning device, line-image forming optical system therein, imaging adjustment method in the device and image forming apparatus
US6509995B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2000 |
| Grant date | Jan 21, 2003 |
| Priority date | — |
| Expiry date | Aug 31, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/128
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light source emitting a light flux; a coupling optical system couples the light flux from the light source to a subsequent optical system by transforming it into a parallel light flux, an approximately convergent light flux or an approximately divergent light flux; a light deflector reflects the light flux from the coupling optical system with a deflection reflective surface, and deflects it; a scanning and imaging optical system condenses the deflected light flux from the light deflector onto a surface to be scanned as a beam spot; and a correcting optical system is provided for self correcting shift of focal position of the beam spot on the surface to be scanned occurring due to environmental change or the like. The correcting optical system comprises at least one pair of a resin-made lens having an anamorphic surface having a negative power in each of main scanning direction and sub-scanning direction and a glass-made lens having an anamorphic surface having a positive power at least in sub-scanning direction, and is disposed between the coupling optical system and deflection reflective surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.