Optical memory disc

Details Optical memory disc Optical memory disc

1984-11-15

1987-04-14

Stephan, Steven L.

Dynamic information storage or retrieval

Storage medium structure

Adjuncts or adapters

369284, 369286, G11B 370, G11B 724

Patent

active

046583939

ABSTRACT:
An optical memory disc includes a glass substrate on which a plurality of concentric circular guide grooves (or a spiral groove) are formed for tracking purposes. A centering plate is secured to the glass substrate in a manner that the center of a circular opening formed in the centering plate is exactly adjusted to the center of the plurality of concentric circular guide grooves (spiral groove). The circular opening formed in the centering plate is utilized to drive the optical memory disc on a turntable. Since the circular opening is not formed directly in the glass substrate, the center adjustment is easily conducted, and there is no possibility that the glass substrate is damaged when the circular opening is formed.

REFERENCES:
patent: 1885415 (1932-11-01), Collison
patent: 2654816 (1953-10-01), Miessner
patent: 4111430 (1978-09-01), Johnson
patent: 4470137 (1984-09-01), Tago
patent: 4480282 (1984-10-01), Brock et al.

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