Beam controller for magneto-optical disc memory system

Details Beam controller for magneto-optical disc memory system Beam controller for magneto-optical disc memory system

1989-03-16

1990-06-19

Stephan, Steven L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369121, 369122, G11B 7125

Patent

active

049359150

ABSTRACT:
A beam controller for controlling a semiconductor laser provided in an optical recording/playback apparatus includes first and second current sources for driving the semiconductor laser at a low level (play-back mode) and/or at a high level (recording or erasing mode). The first and second current sources are controlled to have stable power automatically by a first and second auto-power circuits, respectively. The first and second auto-power control circuits include a sample-hold circuit which stores an output signal from a low-pass filter. This enables the beam controller to avoid the transition response problems of the low-pass filter. A switching circuit is also included to select either the stored low-pass filter signal on the present low-pass filter signal.

REFERENCES:
patent: 4509156 (1985-04-01), Ohara et al.

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