Optical scanning apparatus
US5657146A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1996 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | Jan 17, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/125
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical scanning apparatus for scanning a light beam as a spot image on an image-forming plane apart from a light source, or reversely, for optically reading the graphic image of an object, in which stable high-resolution scanning is embodied. The apparatus includes a light source for providing a collimated beam, a cylindrical lens for linear focusing of the beam in a subscanning direction, a deflector for deflecting the beam in the main scanning direction, plastic toroidal lenses for image-forming the deflected beam and for focusing it to form a spot image, so that the three toroidal lenses have a small F.sub.No and compensate for the tilted mirror surface of the deflector, and allows stable scanning with high resolution that produces high-quality images in optical apparatus such as laser printers and facsimile machines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.