Optical scanning device and image forming apparatus that restrains color aberrations
US6346957B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 2, 2000 |
| Grant date | Feb 12, 2002 |
| Priority date | — |
| Expiry date | Mar 2, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/506
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention provides an optical scanning device for color image formation in which color aberration depending on the variation in the image formation position on the scanned surface caused by the angle change of the optical system. The optical scanning device includes a semiconductor laser array for emitting four light beams, a collimator lens for converging the light beams, a cylindrical lens for converging the light beams, a mirror for changing the optical path of the light beam, a polygon mirror for deflecting the light beam, an f&thgr; lens for focusing the deflected light beams in the fast-scanning direction to be scanned on the exposure lines of photoreceptor drums, a separating polygon mirror for separating the light beams passed through the f&thgr; lens from each other toward the respective photoreceptor drums, and beam corresponding optical systems including reflecting members having two mirror surfaces for reflecting the corresponding light beams one time each, which are adapted to guide the separated light beams to scanned surfaces of the photoreceptor drums.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.