Controller and control method of laser power for recording infor

Details Controller and control method of laser power for recording infor Controller and control method of laser power for recording infor

1993-12-15

1996-02-27

Nguyen, Tan T.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369100, 369111, G11B 700

Patent

active

054954630

ABSTRACT:
In a laser power controller, a part of laser beam emitted from a laser diode 1 is detected with a photodetector 2. The operational processor 3 controls a driver 5 so that the light-emitting power of the laser diode 1 has prescribed values, and the driver 5 drives the laser diode 1. The record powers are set beforehand in one or more gap sections existing between record areas, and the operational processor 3 stores the results of the operation in an external memory 4. On recording, the results stored in the external memory 4 are read by the operational processor 3 so as to set the record powers. Thus, the record powers can be set stably even for a fast recording rate.

REFERENCES:
patent: 5067117 (1991-11-01), Shimizu et al.
patent: 5274621 (1993-12-01), Akatsuka
patent: 5321679 (1994-06-01), Horiguchi
patent: 5359589 (1994-10-01), Mashimo

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