Recording/reproducing apparatus

Details Recording/reproducing apparatus Recording/reproducing apparatus

1990-09-20

1992-10-13

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, G11B 700

Patent

active

051557223

ABSTRACT:
In an optical disk apparatus which reads specifications data from a control track on various types of optical disks requiring different laser powers for data reading, in reading data from the control track, the power of the laser beam of a semiconductor laser oscillator is set low according to an optical disk requiring a low-power laser beam for data reading, and when accessing the control track indicates that the optical disk actually requiring a high-power laser beam, the power of the laser beam is changed to high power.

REFERENCES:
patent: 4972399 (1990-11-01), Miyasaka

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