Device for correcting pitch of scanning lines in a light beam recording system
US4323906A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1980 |
| Grant date | Apr 6, 1982 |
| Priority date | — |
| Expiry date | Jul 25, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K15/1228
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a laser beam scanning type image recording system in which a laser beam is deflected horizontally and vertically to perform raster scanning on a recording material, a linear encoder for making a photoelectric pulse signal is provided with an optical mark in the vicinity of the end portion of the raster scanning so that the laser beam crosses the optical mark. The number of the scanning lines crossing the optical mark is counted to detect the fluctuation in amplitude of vibration of a vibrating mirror for vertically deflecting the laser beam. The gain of a driving circuit for driving the vibrating mirror is controlled according to the counted number of the scanning lines crossing the optical mark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.