Calibrating and power-protecting laser drive circuits

Details Calibrating and power-protecting laser drive circuits Calibrating and power-protecting laser drive circuits

1990-07-20

1993-02-09

Sniezek, Andrew L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4427, G11B 7125

Patent

active

051857340

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.

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