Optical read apparatus for reading a disc-shaped record carrier

Details Optical read apparatus for reading a disc-shaped record carrier Optical read apparatus for reading a disc-shaped record carrier

1979-01-31

1980-11-25

Hecker, Stuart N.

Static information storage and retrieval

Addressing

Optical

1791003V, G11C 1308, G11B 700

Patent

active

042362326

ABSTRACT:
An optical read apparatus for reading a disc-shaped record carrier. A read element is mounted on an adjusting member by means of which the read element is radially movable. Moreover, there is provided a deflection element for correcting the radial position of the scanning spot. In order to enable an arbitrary information unit on the record carrier to be read with a short searching time, the drive of both the adjusting member and the deflection element is controlled. In order to enable the adjusting member to be moved in a rapid and controlled manner there is provided a position indicator, which indicates the instantaneous radial position of the read element. Moreover, there is included a correction circuit which eliminates the adverse effect of inaccuracies in the position indicator on the searching time.

REFERENCES:
patent: 3634682 (1972-01-01), Gold
patent: 3962688 (1976-06-01), Westerberg
patent: 4138663 (1979-02-01), Lehureau
patent: 4142098 (1979-02-01), Korpel

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