Calibrating and power-protecting laser drive circuits
US5185734A · kind A · utility
25Cited by
12References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1990 |
| Grant date | Feb 9, 1993 |
| Priority date | — |
| Expiry date | Jul 20, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0683
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical disk recorder has a laser driven by a digital analog converter (DAC). During initialization a pair of comparators actuated at minimum and at maximum power levels for actuating a microprocessor to calibrate a DAC 23 between the minimum and maximum power levels rended of digital input changed to the DAC. The same comparators can be used during normal recording and reading operations for detecting under and over power conditions of the laser. Procedures for the calibration and over power and under power detection are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.