Two element optical system for focus error correction in laser scanning systems
US5276544A · kind A · utility
8Cited by
3References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 27, 1992 |
| Grant date | Jan 4, 1994 |
| Priority date | — |
| Expiry date | Nov 27, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/128
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A raster scanning system is disclosed which utilizes a focus error correction system for correcting a focus error both in the fast-scan plane and in the cross-scan plane without affecting the scan characteristics of the post polygon optics. The focus error correction system comprises at least two axially adjustable lenses. One of the lenses is spherical and the other is cylindrical in the fast scan plane. The spherical lens has to be adjusted first to correct the focus error in the cross-scan plane. Next, the cylindrical lens should be adjusted to correct the focus error in the fast-scan plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.