Method and apparatus for controlling optical output of laser light source
US4899348A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1988 |
| Grant date | Feb 6, 1990 |
| Priority date | — |
| Expiry date | Dec 20, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0683
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of controlling an optical output of a laser light source which scans a photosensitive body comprises the steps of detecting an optical output of the laser light source and generating a monitor signal which has a logic level indicative of whether a laser power of the optical output is greater than or less than a predetermined value, generating signals including a gate signal indicative of a scan time in which the photosensitive body is scanned based on a synchronization detection signal indicative of each scanning line, a laser diode signal having logic levels for turning the laser light source ON and OFF and an enable signal based on the monitor signal, the gate signal and a power set start signal indicative of a start of a power set operation in which the laser power is controlled to the predetermined value, and adjusting a driving current supplied to the laser light source based on the monitor signal when enabled by a certain logic level of the enable signal so as to control the laser power to the determined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.