Light scanning system
US4941719A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1987 |
| Grant date | Jul 17, 1990 |
| Priority date | — |
| Expiry date | May 22, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0031
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light scanning system employing a rotating mirror, spherical lens, and a toric-surfaced reflecting mirror. The toric-surfaced reflecting mirror is disposed in the optical path between the spherical lens and the image plane. The spherical lens sufficiently corrects field curvature and the toric-surfaced reflecting mirror corrects scan nonlinearity. And by the spherical lens and the toric-surfaced reflecting mirror together, the field curvature and the scan nonlinearity are satisfactorily corrected. The toric-surfaced reflecting mirror is surfaced to have a circular arc with a larger radius of curvature in the scan plane and to have a circular arc with a smaller radius of curvature in the cross-scan plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.