Condenser optical system for light scanning system
US5673137A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1996 |
| Grant date | Sep 30, 1997 |
| Priority date | — |
| Expiry date | Feb 12, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/126
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a condenser optical system for a light scanning system, a single lens focuses a light beam deflected by a reflecting surface of a deflector onto a surface to be scanned and causes the deflected light to scan the surface in a main scanning direction at a constant speed. A cylindrical mirror which has a refracting power only in a sub-scanning direction normal to the main scanning direction compensates for surface tilt of the reflecting surface. At least one surface of the single lens is toric to compensate for the surface tilt associated with the cylindrical mirror and the toric surface is aspheric in a main-scanning cross-section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.