Information memory medium

Details Information memory medium Information memory medium

1987-11-04

1989-09-12

Stephan, Steven L.

Dynamic information storage or retrieval

Storage medium structure

Adjuncts or adapters

360133, 369270, G11B 2504, G11B 2300

Patent

active

048666971

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 one 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 three projections formed in the surface thereof which faces away from the recording layer. The magnetic member has three engaging holes and is mounted on the centering member, with the projections of the centering member fitted in the engaging holes. 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: 4613921 (1986-09-01), Holmes
patent: 4634617 (1987-01-01), Ohta et al.
patent: 4686666 (1987-08-01), Dieffenbach
patent: 4695910 (1987-09-01), Maruyama et al.
patent: 4733388 (1988-03-01), Fujimoto et al.

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