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Optical recording medium and production thereof

  • US 5,424,102 A
  • Filed: 01/03/1994
  • Issued: 06/13/1995
  • Est. Priority Date: 05/21/1991
  • Status: Expired due to Term
First Claim
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1. A process for producing an optical recording medium comprising a transparent resin substrate, a recording layer overlying the substrate, a metal reflective layer overlying the recording layer, and a protective layer overlying the metal reflective layer, which comprises:

  • forming a recording layer containing a dye by spin-coating on the substrate;

    removing the recording layer in the vicinity of the outermost peripheral portion of the substrate to form a portion at the inside of the outermost periphery of the substrate where the surface of the substrate is exposed;

    forming the metal reflective layer on the recording layer such that the recording layer extends beyond the inner peripheral portion of the metal reflective layer whereas the metal reflective layer extends beyond the recording layer at the outer peripheral portion thereof and a region having no metal reflective layer is provided at the outermost peripheral portion of the substrate;

    coating the substrate bearing the recording layer and the metal reflective layer with a liquid resin capable of dissolving the recording layer from at least the part of the recording layer extending beyond the inner peripheral portion of the metal reflective layer to the outermost peripheral portion of the substrate, thereby removing the portion of the recording layer extending beyond the inner peripheral portion of the metal reflective layer from the surface of the substrate by dissolution;

    and curing the liquid resin whereby the thus-formed protective layer extends over and beyond the metal reflective layer and contacts the substrate both at the inner and the outer peripheral portions of the substrate.

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