Laser driving apparatus and image forming apparatus using the same
US6144680A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1998 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Jul 14, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0683
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laser driving apparatus for driving a plurality of laser beam sources includes a plurality of laser beam sources, a photodetector for detecting amounts of laser beams emitted from the plurality of laser beam sources, a plurality of current sources for driving the plurality of laser beam sources, a plurality of switches respectively interposed between the plurality of laser beam sources and the plurality of current sources, a plurality of controllers for controlling light amounts of the plurality of laser beam sources by comparing the light amounts detected by the photodetector with a reference value and controlling current amounts of the plurality of current sources in accordance with the comparison values, a plurality of sample/hold circuits respectively interposed between the photodetector and the plurality of controllers, and timing adjustment device for outputting a plurality of timing signals of a first type for controlling the plurality of switches and a plurality of timing signals of a second type for controlling the plurality of sample/hold circuits. The timing adjustment device outputs the plurality of timing signals of the first type for time-divisionally turning on the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.