Center hole formation in an information storing disc

Details Center hole formation in an information storing disc Center hole formation in an information storing disc

1973-03-12

1976-02-17

Haroian, Harry N.

Undertaking

G11B 1706

Patent

active

039388107

ABSTRACT:
A video disc having signal information stored in a spiral groove, has a center hole formed by creating a closed convolution of predetermined diameter concentrically to said spiral groove and removing the disc material within this closed convolution.

REFERENCES:
patent: 683023 (1901-09-01), Donovan
patent: 1195101 (1916-08-01), Schiffman
patent: 1246925 (1917-11-01), Hunt
patent: 2142563 (1939-01-01), Harris
patent: 2219930 (1940-10-01), Kellogg
patent: 3535182 (1970-10-01), Maletz
patent: 3589736 (1971-06-01), Gorman

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