Method of reducing average data rate in rotating mirror laser recorder
US4899176A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 25, 1988 |
| Grant date | Feb 6, 1990 |
| Priority date | — |
| Expiry date | Aug 25, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3292
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laser printer records an image on a medium as a function of digital data which is received at an input data rate. A laser beam is used for recording pixels of the image on the medium while the medium is advanced in a longitudinal direction at a controlled uniform rate. The pixels are recorded by scanning the beam across the medium in a transverse direction, at a scan velocity, using a multifaceted, rotating mirror which reflects the beam onto the medium. The scan velocity is proportional to the angular velocity of the rotating mirror. Beam intensity is modulated as a function of the input digital data. In order for the average data rate of recording to be compatible with the input data rate while maintaining a high instantaneous scan velocity, the beam is scanned across the medium by only one of every N-facets of the rotating mirror.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.