Disc for recording information signals

Details Disc for recording information signals Disc for recording information signals

1992-06-25

1994-06-21

Bertsch, Richard A.

Dynamic information storage or retrieval

Storage medium structure

Specified center hole or locating structure

369270, 369290, G11B 584, G11B 2303

Patent

active

053233816

ABSTRACT:
A disc for recording information signals includes a disc substrate of a synthetic resin having a center hole and an information signal recording layer formed on one major surface and a magnetic plate arranged on the major surface for closing the center hole. A recess for accommodating the magnetic plate is formed on the major surface of the disc substrate for surrounding the center hole. At least a part of the rim of the recess is thermally deformed for forming one or more lugs for holding the magnetic plate disposed in the recess with respect to the disc substrate by the lug(s).

REFERENCES:
patent: 4787009 (1988-11-01), Takahashi
patent: 4829510 (1989-05-01), Takahashi
patent: 4926410 (1990-05-01), Suzuki et al.
patent: 4941066 (1990-07-01), Swinburn et al.
patent: 4944982 (1990-07-01), Kikuchi
patent: 4983439 (1991-01-01), Saito
patent: 5057960 (1991-10-01), Shiba et al.
Patent Abstracts of Japan vol. 12, No. 388 (P-771) (3235) 17 Oct. 1988 & JP-A-63 129 578 (Matsushita Electric Ind. Co. Ltd.) 1 Jun. 1988 *abstract*.

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