Optical information processing apparatus for light beam focus de

Details Optical information processing apparatus for light beam focus de Optical information processing apparatus for light beam focus de

1985-05-21

1987-07-21

Psitos, Aristotelis M.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

250201, H04N 700

Patent

active

046823166

ABSTRACT:
An optical information processing apparatus comprising record/reproduction devices for irradiating a focused light beam onto a track on a record medium to record or reproduce information tracking control devices for precisely directing the irradiated light beam to the track split devices for splitting at least a portion of a reflected or transmitted light beam of the irradiated light beam from the record medium into two light beams first screen devices for screening a center area of one of the split light beams across a width of the track second screen devices for screening a peripheral area of the other of the split light beams across the width of the track and detection devices for comparing light intensities of the two light beams transmitted without being screened by said first and second screen devices to detect a focusing state of the irradiated light beam to the record medium.

REFERENCES:
patent: 3544801 (1970-12-01), Dyck
patent: 3567855 (1971-03-01), Hamisch
patent: 4023033 (1977-05-01), Bricot et al.
patent: 4079248 (1978-03-01), Lehureau et al.
patent: 4103998 (1978-08-01), Nakazawa et al.
patent: 4450547 (1984-05-01), Nakamura et al.
patent: 4517666 (1985-05-01), Ando

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