Optical discs with cover sheets and pressure equalization of the

Details Optical discs with cover sheets and pressure equalization of the Optical discs with cover sheets and pressure equalization of the

1996-11-22

1999-02-16

Cao, Allen T.

Dynamic information storage or retrieval

Storage medium structure

Adjuncts or adapters

G11B 370

Patent

active

058727680

ABSTRACT:
An optical disc is disclosed having a substrate in which data can be written on or read from, such optical disc has a transparent cover sheet which is held at a desired spacing from the substrate at least at an inner radius and an outer radius. In order to prevent the transparent cover sheet from deflecting due to pressure differences between the outside atmosphere and the air in the space between the substrate surface and the transparent cover sheet, a plurality of air passages in the transparent cover sheet are provided near an inflection point where on one lateral side of the point the transparent sheet will bulge and on the other lateral side it will be depressed due to centrifugal force acting upon air entrapped between the transparent cover sheet and the substrate surface during disc rotation in an optical disc drive. This arrangement equalizes the pressure in the air space between the transparent cover sheet and the substrate surface and the outside atmosphere.

REFERENCES:
patent: 4499996 (1985-02-01), Coyle
patent: 4504842 (1985-03-01), Odawara
patent: 4507774 (1985-03-01), Marchant
patent: 4539573 (1985-09-01), Marchant et al.
patent: 4873594 (1989-10-01), Chen
patent: 4972404 (1990-11-01), Yamaguchi et al.

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