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Optical disk and method for its manufacture

  • US 5,770,348 A
  • Filed: 03/27/1996
  • Issued: 06/23/1998
  • Est. Priority Date: 03/29/1995
  • Status: Expired due to Fees
First Claim
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1. An optical disk comprising:

  • a transparent substrate;

    a ring-shaped signal layer, on top of said transparent substrate, which is made of radiation curable resin and has a peel strength against said transparent substrate in the range of about 20/100 to about 80/100 in the test method JIS-K5400;

    a reflective layer that is formed on top of said signal layer; and

    a protective layer that is formed on top of said reflective layer;

    wherein the outer and inner diameters of said signal layer are represented by Os and Is respectively, the outer and inner diameters of said reflective layer are represented by Or and Ir respectively, and the outer and inner diameters of said protective layer are represented by Op and Ip respectively, these diameters satisfy the relationships,
    
    
    space="preserve" listing-type="equation">Os<

    Or<

    Opand
    
    
    space="preserve" listing-type="equation">Ip<

    Ir<

    Is.

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