Automatic record playing apparatus having a tone arm position de

Details Automatic record playing apparatus having a tone arm position de Automatic record playing apparatus having a tone arm position de

1980-08-26

1984-03-13

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specified detail of transducer assembly support structure

369 33, 369 41, 369215, 369230, 369226, G11B 306

Patent

active

044371810

ABSTRACT:
A record disc playing apparatus has a tone arm position detecting device which comprises a position detection part comprising a plurality of reading elements aligned in line, a code part comprising a plurality of rows of code patterns shifted in the direction of alignment of reading elements and extending along substantially perpendicular directions to the alignment direction of reading elements, and an encoder which is supplied with the output signal of the position detection part and produces address signals according to the relative position of the position detection part and the reading part. One of the code part and the position detection part is fixed and the other unitarily undergoes displacement with a tone arm of the record disc playing apparatus. The position detection part relatively scans the code patterns of the code part, the code patterns have combinations of existence and non-existence portions in the alignment direction of the reading elements, the combinations are arranged differently according to the position of the relative scanning by the position detection part.

REFERENCES:
patent: 3506269 (1970-04-01), Hannah
patent: 3993315 (1976-11-01), Hansen et al.
patent: 4142729 (1979-03-01), McLennan
patent: 4184688 (1980-01-01), Omura et al.
patent: 4196379 (1980-04-01), Iyeta et al.

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