Optical disk drive wherein a preset reading laser power is used

Details Optical disk drive wherein a preset reading laser power is used Optical disk drive wherein a preset reading laser power is used

1991-09-11

1993-07-27

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369106, G11B 700

Patent

active

052316254

ABSTRACT:
This invention relates to a technique for obtaining a desired laser power. In write mode the laser power in an optical disk drive is determined in accordance with a DAC value which controls a power supply for the laser, but the correlation between the laser power and the DAC value significantly varies depending on the efficiency of the individual laser diode or laser oscillator. Because the laser power in read mode has been adjusted to a predetermined value during manufacturing, the DAC value which generates the same laser power as the reading laser power is known and is used to generate the desired laser power, such as the writing laser power.

REFERENCES:
patent: 4698797 (1987-10-01), Komatsu
patent: 4796250 (1989-01-01), Kobayashi et al.
patent: 5067122 (1991-11-01), McGee

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