System for detecting the operative face of a disc carrying data

Details System for detecting the operative face of a disc carrying data System for detecting the operative face of a disc carrying data

1983-02-18

1985-01-29

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, G11B 700

Patent

active

044970498

ABSTRACT:
A detector system for the operative face of a disc carrying data on one face only is applicable to a laser or optical reading means which is located in turntable apparatus whereby the user is warned of the fact that the disc is placed upside-down and that, therefore, the data which it carries cannot be reproduced. A control signal is generated by the detector system, producing a warning or tripping an operation such as the rejection of the disc or the interruption of the insertion movement.

REFERENCES:
patent: 4337532 (1982-06-01), Romeas

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