Multi-beam scanning optical system with reduced interbeam displacement and image forming apparatus using the same
US6833855B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 4, 2002 |
| Grant date | Dec 21, 2004 |
| Priority date | — |
| Expiry date | Jun 25, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/123
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A multi-beam scan optical system and an image forming apparatus using the same are provided in which high-quality printing can be realized at high speed with a relatively simple construction. The multi-beam scanning optical system comprises an entrance optical unit for introducing, to a deflecting unit, a plurality of light beams emitted from a light source unit having a plurality of light emitting portions arranged apart from each other at least in a main scan direction; a scanning optical unit for focusing the plurality of light beams deflected by the deflecting unit on a surface to be scanned; and a synchronous detection optical unit for converging, by a synchronous detection lens unit, parts of the plurality of light beams deflected by the deflecting unit on a plane of a slit, introducing the parts of the plurality of light beams to a synchronous detection sensor, and controlling timing of scan start positions on the surface to be scanned with respect to the plurality of light beams by using signals from the synchronous detection sensor. The focal distance of the scanning optical unit differs from the focal distance of the synchronous detection lens unit, and a predetermined co…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.