Record

Details Record Record

1983-08-26

1985-08-27

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

369280, 369282, G11B 2300, G11B 2504

Patent

active

045382581

ABSTRACT:
A record (12) comprising a convex protrusion (12a) at its center, one or more protrusions (12b) extending perpendicularly from the plane of the record at its circumferential edge, and a recording area between the center and the circumferential edge. The protrusions engage similar indentations (3b, 3e) formed in a turntable to facilitate centering and holding the record for playing and to prevent rotational slippage.

REFERENCES:
patent: 2503609 (1950-04-01), Barnhart
patent: 2809843 (1957-10-01), Mueller

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