Optical pickup control device

Details Optical pickup control device Optical pickup control device

1987-05-18

1989-08-15

McElheny, Jr., Donald

Dynamic information storage or retrieval

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

Mechanism control by the control signal

G11B 700

Patent

active

048582166

ABSTRACT:
An optical pickup control device receives a laser beam reflected from a disc pit with a four split photo-detector and performs a tracking servo in response to two diagonal sum outputs of this four split photo-detector. The device comprises a neutral position control circuit which receives a left adjacent sum output and a right adjacent sum output of the four split photo-detector and, in response to these adjacent sum outputs, controls a neutral position of an objective lens so that these adjacent sum outputs become equal to each other. In an embodiment of the invention, the neutral position control circuit servo-controls a feed motor of the optical pickup with a difference signal between the left and right adjacent sum outputs. The device effectively corrects deviation of a beam spot from a center of the four split photo-detector and thereby improves the quality of a tracking error signal.

REFERENCES:
patent: 4467462 (1984-08-01), Shibata
patent: 4544838 (1985-10-01), Musha et al.
patent: 4744069 (1988-05-01), Sugiyama et al.

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