Dynamic information storage or retrieval – Storage medium structure – Specified center hole or locating structure
Patent
1987-11-04
1989-05-02
Stephan, Steven L.
Dynamic information storage or retrieval
Storage medium structure
Specified center hole or locating structure
360133, 360135, 369271, 369290, G11B 724
Patent
active
048274704
ABSTRACT:
An optical disk comprising a disk-like body having two base plates made of synthetic resin and two recording layers formed on the base plates, respectively. The body is formed by bonding the base plates, with a spacer interposed therebetween, such that the recording layers face each other. The disk further comprises two centering members, each projecting from the surface of the center portion of each base plate. Each centering member is made of synthetic resin, and one magnetic member is mounted on the centering member. The centering member is inserted in a hole formed in the center portion of the body. The centering member has a center hole defining the center of rotation of the body, and also a recess for holding the magnetic member. Four through-holes are formed in the bottom of the recess. The magnetic member has four projections and is held in the recess, with the projections inserted into the through-holes of the bottom of the recess. Since the optical disk has magnetic members, one on each surface, it can be attracted to the turntable of a drive mechanism by means of the magnetic force exerted by the magnet fitted in the recess formed in the surface of the turntable.
REFERENCES:
patent: 4097 (1887-01-01), Odawara
patent: 2806704 (1957-09-01), Burdett
patent: 3706085 (1972-12-01), Mowrey et al.
patent: 4587647 (1986-05-01), Mak et al.
patent: 4658311 (1987-04-01), Sakaguchi
Inage Nobuo
Odawara Kazuharu
Kabushiki Kaisha Toshiba
Stephan Steven L.
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