Optical disc with surface coating and manufacturing method there

Details Optical disc with surface coating and manufacturing method there Optical disc with surface coating and manufacturing method there

1994-06-14

1995-09-26

Sugarman, Scott J.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692755, 369283, 430271, 430523, 430935, G11B 724

Patent

active

054539757

ABSTRACT:
An optical disc includes a recording film formed on one surface of a disc-shaped plastics substrate having light transmission properties, and a coating film formed on the other surface of the substrate to which an optical beam is applied, in which the plastics substrate is made by injection molding and a barrier, such as a U-shaped annular groove or ridge, is circumferentially formed on the other surface, at a radial distance which is the distance from a center position to a joint position of an injection mold, and a method for manufacturing the same.

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patent: 5176943 (1993-01-01), Woo
patent: 5202171 (1993-04-01), Anezaki et al.
patent: 5202220 (1993-04-01), Park et al.

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