Optical recording disc

Details Optical recording disc Optical recording disc

1987-02-20

1988-11-15

Stephan, Steven L.

Dynamic information storage or retrieval

Storage medium structure

Specified center hole or locating structure

360135, 369271, 369290, G11B 2300, G11B 582, G11B 700

Patent

active

047854448

ABSTRACT:
An optical recording disc in which a disc substrate made of a synthetic resin having a light transmittance and a hub made of a synthetic resin, fixed to a center part of the disc substrate by means of a predetermined technique such as a supersonic wave expansion molding and on which a circular magnetic metal plate is installed by means of an insert molding and so on are provided and a circular groove which is continuous at an outer peripheral side of a fixing part between the disc substrate and hub is furthermore installed on at least either of the disc substrate or hub. The groove is provided for absorbing a stress generated due to a difference in thermal expansion rates between the disc substrate made of the snythetic resin and magnetic metal plate.

REFERENCES:
patent: 4504842 (1985-03-01), Odawara
patent: 4616278 (1986-10-01), Yamaguchi et al.
patent: 4644520 (1987-02-01), Lange
patent: 4658311 (1987-04-01), Sakaguchi
patent: 4680655 (1987-07-01), Sugawara
patent: 4694370 (1987-09-01), Ommori et al.

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