Method and apparatus for beam displacement in a light beam scanner
US5018808A · kind A · utility
25Cited by
12References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1969 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Dec 26, 1989 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus is provided for line scanning a beam receiving member, wherein a scanning beam is angularly or laterally displaced to compensate for scan line spacing error. The beam is displaced according to error arising from variation (flutter) in the relative motion of the beam and the beam receiving member, or according to error arising from movement of the receiving member while the scanning beam travels to a start of scan position, or both. Embodiments of beam displacement means include a refracting tilt plate, a reflecting tilt plate, a diffracting tilt plate, and a tilt prism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.