Dual beam optical turntable

Details Dual beam optical turntable Dual beam optical turntable

1988-11-04

1990-11-20

Levy, Stuart S.

Dynamic information storage or retrieval

Optical reading of mechanical record

369 4411, 369112, 369 4421, 2502014, G11B 1118

Patent

active

049723448

ABSTRACT:
Disclosed is an optical turntable system for optically playing phonograph records having a recorded signal in a groove formed by a wall having a position modulated by the recorded signal. An optical unit includes an optical source providing a first light beam incident onto the wall to provide a reflected beam from the wall forming a reflected spot at a reflected position proportional to the recorded signal and also includes an optical sensor for sensing the reflected position of the reflected spot to provide an output data signal proportional to the recorded signal. The optical unit also includes a tracking assembly which functions to position the optical unit over the section of the groove of interest as the record turns.

REFERENCES:
patent: 1196973 (1933-07-01), Friebus
patent: 4621351 (1986-11-01), Baer et al.
patent: 4760247 (1988-07-01), Keane et al.
patent: 4870631 (1989-09-01), Stoddard

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