Optical tracking servo apparatus

Details Optical tracking servo apparatus Optical tracking servo apparatus

1988-09-21

1992-01-21

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4415, 369 4414, 369 4422, 350247, 350 63, 350255, G11B 700, G02B 2608, G02B 702

Patent

active

050833022

ABSTRACT:
A tracking servo apparatus for performing a control so that a light beam is irradiated onto a predetermined track of an information recording surface of a disc shaped recording medium comprising an optical system for focusing the light beam on the information recording surface of the disc shaped recording medium, a holder for holding the optical system, tracking error detection circuit for detecting a tracking error of the light beam irradiated on the information recording surface with respect to the predetermined track by receiving a reflected light of the irradiated light beam that has been reflected from the information recording surface, and outputs an error signal in accordance with the tracking error, and a piezoelectric device which is connected to the holding means, and is deformed when supplied with an amplified voltage of the error signal so as to deflect the holder and thus moves the optical system so that the light beam is irradiated on to the predetermined track of the information recording surface.

REFERENCES:
patent: 4385373 (1983-05-01), Howe
patent: 4443721 (1984-04-01), Jansen
patent: 4545046 (1985-10-01), Jansen et al.
patent: 4616355 (1986-10-01), Kasahara
patent: 4794581 (1988-12-01), Andersen

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