Optical scanner
US5029956A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1990 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | Jan 19, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/125
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical scanner comprises a light source device; a linear image forming device for forming an approximately parallel light beam from the light source device as a linear image extending in a main scanning corresponding direction; a rotary polygon mirror having a deflection-reflecting face in the vicinity of the image forming position of the linear image; and an image forming optical system arranged between the rotary polygon mirror and a scanned face and setting the scanned face and a deflecting start point of the deflection-reflecting face in an approximately conjugate relation in geometrical optics with respect to a secondary scanning direction, the image forming optical system forming the deflected light beam from the deflection-reflecting face as an image of a light spot on the scanned face. The linear image forming device has a transparent elastic parallel plate, a cylindrical lens, a deforming device for flexing the elastic parallel plate in the shape of an arc by applying a deforming force thereto to change a radius of curvature of a face of the elastic parallel plate, and a controller for controlling the application of the deforming force in synchronization with an optica…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.