Light scanning system
US4850663A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1987 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | Apr 7, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0031
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light scanning system uses a tilting angle error correcting system, applying a conjugate relation from geometrical optics. A light beam from a light source is converged to a linear image near a deflecting surface of a deflector by a first converging optical system. The deflected light beam from the deflecting surface is converged to a light spot on a scanning plane by a second converging optical system. The first converging optical system provides the light converging effect only in a plane perpendicular to the direction of scan and also has an overcorrected spherical aberration, so that the spherical aberration of the entire system can be favorably corrected, thereby making it possible to obtain a high converging performance for realizing high resolution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.