Optical head

Details Optical head Optical head

1984-08-10

1987-03-31

McElheny, Jr., Donald

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 13, 369116, 369118, G11B 7135

Patent

active

046548394

ABSTRACT:
In an optical head for effecting the recording of information onto a recording medium or the reproduction of information from the recording medium, a light beam supplied from a light source unit is directed to the recording medium by a first optical system, the light beam from the recording medium is divided into two light beams by a light divider in a second optical system and the two light beams are directed to photodetectors by the second optical system, and even if the light beam entering the light divider is displaced by tracking, the quantities of light of the two divided light beams are not varied, whereby the influence of the tracking operation on auto focusing is eliminated.

REFERENCES:
patent: 3971002 (1976-07-01), Bricot et al.
patent: 3997715 (1976-12-01), Elliott
patent: 4357533 (1982-11-01), Winslow
patent: 4513408 (1985-04-01), Nomura et al.
patent: 4559622 (1985-12-01), Hazel et al.

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