Optical head

Details Optical head Optical head

1987-09-04

1988-08-23

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 46, 369112, 369118, 369120, G11B 7135

Patent

active

047665823

ABSTRACT:
In an optical head, recording, reproducing and guide laser beams are emitted from semiconductor lasers, and the laser beams are optically mixed by a mixed. The mixed laser beams are converged onto a tracking guide of a recording surface by an objective lens and are reflected from the recording surface. The reflected laser beams are separated into the recording, reproducing and guide laser beams by the beam separator. The recording and guide laser beams are shielded in the beam separator, and only the reproducing laser beam is directed to photodetecting regions of information, tracking error and defocus detectors.

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