Optical disk

Details Optical disk Optical disk

1987-05-22

1988-11-22

Stephan, Steven L.

Dynamic information storage or retrieval

Storage medium structure

Specified center hole or locating structure

369284, 369290, G11B 2300, G11B 582, G11B 700

Patent

active

047870095

ABSTRACT:
An optical recording and/or reproducing disk includes a disk substrate and a chucking hub, in which the chucking hub is formed of a synthetic resin ring having formed on its lower surface a welding portion and on its upper surface a ultrasonic welding horn contact portion and a disk-shaped metal plate made of a magnetic material and forming near its outer peripheral portion a low stepped portion, the synthetic resin ring being integrally formed on the low stepped portion by a resin molding and the chucking hub being fixed to the central portion of the disk substrate by welding a welding portion of an resin ring by using the ultrasonic welding horn.

REFERENCES:
patent: 4503474 (1985-03-01), Nigam
patent: 4564932 (1986-01-01), Lange 369286

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