Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1998-04-17
1999-11-09
Cabeca, John W.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4437, 369 4423, 369 94, 369119, G11B 714
Patent
active
059827335
ABSTRACT:
An optical head emits a plurality of light beams onto an information record medium to perform a recording operation and/or a reproducing operation. The optical head is provided with: a plurality of light source, each outputting one of the light beams; an objective lens for collecting the light beams outputted from the light sources onto the information record medium; an optical element located on the optical path of only one of the light beams; a detector for receiving the light beam from the information record medium and outputting a detection signal; and a generating circuit for generating a drive signal based on the detection signal. The optical head is further provided with a dual-axis actuator for actuating the optical element in an optical axis direction of the light beam and in a substantially perpendicular direction to the optical axis direction in accordance with the drive signal. Because the objective lens is commonly used for all of the light beams while the optical element is actuated by the dual-axis actuator, the number of parts in the optical head is reduced while permitting the necessary collection of the light beams from the information record medium.
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Sano Fumihiko
Yanagawa Naoharu
Cabeca John W.
Chu Kim-Kwok
Pioneer Electronic Corporation
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