Apparatus for controlling intensity of laser beam emitted from semiconductor laser unit
US5134623A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1990 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Dec 27, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/06209
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an apparatus for adjusting the intensity of a light beam, the light beam from a semiconductor laser is deflected to scan a photosensitive drum and is detected to generated a positional signal by photodetector outside of the drum. The intensity of the light beam is also detected by a monitor detector and compared with a predetermined value. The comparison result is latched in a first latch circuit in accordance with the positional signal and a driving data is determined in accordance with the latched comparison data. The driving data is also latched in a second latch circuit and the semiconductor laser is controlled depending on the latched driving data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.