Optical scanner and reader for information contained in light re

Details Optical scanner and reader for information contained in light re Optical scanner and reader for information contained in light re

1984-07-09

1988-01-05

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, G11B 700, G11B 2110

Patent

active

047180501

ABSTRACT:
The invention provides a reader and scanner, in particular for the reading of audio and/or video information recorded on plate-shaped information carriers. A scanning head can be pivoted around an axis in order to provide fine control. The scanning head is maintained in a defined middle position with springs. A magnetic circuit is constructed of a permanent magnet, pole shoes and a coil with a core provides a controllable or automatically controllable movement of the scanning head. The displacement of the scanning head can be determined with a piezoelectric converter, which is disposed between one of the two springs and the support associated with the pole shoes. Desired displacements of the scanning head can be obtained with a second electromechanical converter, which is disposed between the other spring and the other support, after application of a suitable voltage.

REFERENCES:
patent: 3962688 (1976-06-01), Natanael
patent: 4236232 (1980-11-01), Jansen et al.
patent: 4239942 (1980-12-01), Van Alem et al.
patent: 4282598 (1981-08-01), Elliott
patent: 4302830 (1981-11-01), Hamaoka et al.
patent: 4330880 (1982-05-01), Van Dijk
patent: 4342435 (1982-08-01), Kallmeyer et al.
patent: 4397009 (1983-08-01), Eriksson
patent: 4494154 (1985-01-01), Akiyama
patent: 4561081 (1985-12-01), Janssen et al.

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