Optical disc

Details Optical disc Optical disc

1989-02-17

1990-11-20

Levy, Stuart S.

Dynamic information storage or retrieval

Storage medium structure

Layered

369283, 369291, 369280, 346137, G11B 724, G01D 1534

Patent

active

049724045

ABSTRACT:
An optical disc is disclosed in which a pair of circular disc substrates are arranged in confronted relation with each other with their signal recording layers being directed inwardly and are bonded to each other through spacers at inner and outer peripheral portions. A vent hole is formed in a main surface of one of the disc substrates. A disc label is bonded on the disc substrate so as to cover the vent hole.

REFERENCES:
patent: 3761013 (1973-09-01), Schuster
patent: 4504842 (1985-03-01), Odawara

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