Optical recording medium and process for producing same

Details Optical recording medium and process for producing same Optical recording medium and process for producing same

1996-01-19

1998-02-03

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 643, 428 644, 428 647, 428913, 43027011, 4304951, 430945, 369283, 369288, 4273722, 4273855, B32B 300

Patent

active

057142220

ABSTRACT:
The optical recording medium has an optically transparent substrate having a center hole, a recording layer formed on the substrate, and a protective layer. The protective layer has an opening whose center coincides with a center of the center hole of the substrate, and the opening of the protective layer is larger than the center hole of the substrate. The optical recording medium is produced by a process including the steps of forming the protective layer for covering the recording layer so that the protective layer has an opening whose center coincides with a center of the center hole, and forming the opening of the protective layer so that it is larger than the center hole of the substrate. The step of forming the protective layer may be achieved using a spin coating method.

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patent: 5316814 (1994-05-01), Sawada et al.
patent: 5382460 (1995-01-01), Onagi et al.
European Search Report dated Jul. 19, 1996.

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