Precession scanning system
US4372670A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1981 |
| Grant date | Feb 8, 1983 |
| Priority date | — |
| Expiry date | Feb 23, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/526
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging system is provided for scanning stationary objects in an object plane and projecting the image onto a moving flat photoreceptor in such a manner that the image moves in a direction opposite the photoreceptor movement. In a preferred embodiment, the scanning illumination elements comprise a modified dual rate mirror system where the second mirror is moving at less than 1/2 the speed of the scan mirror thereby causing a resultant increase in platen-to-lens distance. This increase is compensated for, and image precession obtained, by moving the lens and mirror assembly along the optical axis in a direction opposed to that of the photoreceptor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.