Optical information pickup apparatus

Details Optical information pickup apparatus Optical information pickup apparatus

1984-02-15

1986-12-30

Richardson, Robert L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

250201, 369 46, G11B 700

Patent

active

046334548

ABSTRACT:
An optical information pickup apparatus for use in an optical disc reader in which a regenerated information signal, a focus servo signal and a tracking servo signal are produced with a single illuminating beam and a single optical system. The light sensing element is divided into four light sensing surfaces. An inner pair of the light sensing surfaces are symmetrically disposed along a line forming a 45.degree. angle with a line on the surface of the detector corresponding to the tracking direction on the recorded disc. The third and fourth light sensing surfaces surround the first and second light sensing surfaces and are divided along the line corresponding to the tracking direction. Signals are combined from the light sensing surfaces to produce the regenerated information signal, the focus servo signal and the tracking servo signal.

REFERENCES:
patent: 4357533 (1982-11-01), Winslow
patent: 4414658 (1983-11-01), Yoshida
patent: 4445209 (1984-04-01), Mickleson et al.

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