Apparatus for driving a semiconductor laser for use in a laser-beam printer
US4513300A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 14, 1983 |
| Grant date | Apr 23, 1985 |
| Priority date | — |
| Expiry date | Jun 14, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K15/1214
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for driving a semiconductor laser for use in a laser-beam printer, in which a laser beam from the laser is deflected so as to scan a light-sensitive drum and a light-sensitive detector placed in the vicinity of one edge of the drum, comprises a first device for determining the operation level for the laser when it scans the drum to record information thereon, a second device for determining the operation level for the laser when it scans the detector to provide a scanning start pulse signal and a controller for controlling the first and second devices so that they are alternately enabled to determine the intensity of the laser beam depending upon whether the drum or the detector is scanned, whereby the intensity of the laser beam is allowed to be adjusted in accordance with the varying light-sensitivity of the drum without fluctuating the instant of generation of the scanning start pulse signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.