Light quantity control device
US4890288A · kind A · utility
30Cited by
10References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1987 |
| Grant date | Dec 26, 1989 |
| Priority date | — |
| Expiry date | Aug 21, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/06832
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light quantity control device suitable for use in a laser beam printer. A controller varies the quantity of light emitted by a semiconductor laser so as to maintain a constant light quantity, regulating the rate of variation of the light quantity according to the output of a monitor for detecting the quantity of light emitted from the semiconductor laser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.