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Protecting film for optical recording medium and optical recording medium

  • US 20030043730A1
  • Filed: 11/27/2001
  • Published: 03/06/2003
  • Est. Priority Date: 03/29/2000
  • Status: Abandoned Application
First Claim
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1. An optical recording medium protecting film characterized by being a single transparent film made of a thermoplastic resin, having a glass transition temperature of 120°

  • C. or higher and a water absorption of no greater than 1 wt %, and having a retardation at a wavelength of 550 nm that satisfies both of the following inequalities (1) and (2).|R(550)|≦

    15 nm 



    (1)|K(550)|≦

    40 nm 



    (2)where R(550) is the in-plane retardation of the transparent film at a wavelength of 550 nm and K(550) is the value calculated by k=[nz

    (nx+ny)/2]×

    d (where nx, ny and nz are the three-dimensional refractive indexes of the transparent film in the x-axis, y-axis and z-axis directions, respectively, and d is the thickness of the transparent film) for the transparent film at a wavelength of 550 nm;

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