Wobble correction lens with binary diffractive optic surface and refractive cylindrical surface
US5208701A · kind A · utility
421Cited by
6References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 24, 1991 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Dec 24, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0031
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wobble correction lens for a raster output scanner combines a positive cross-scan plano-cylindrical lens, which provides most of the optical power for focusing the light beam to a scan line, with a diffractive surface, which corrects the cross-scan field curvature of the cross-scan plano-cylindrical lens. The diffractive surface will have a multi-level structure (binary diffractive optical surface) which possesses a diffractive phase function that will flatten the cross-scan field curvature of the plano-cylindrical lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.