Patent ID: 6042919
Filing Date: 2000-03-28
Classification: G11B,Y10S,Y10T

Abstract:
An optical data storage medium, comprising:a. a substrate through which a beam of a predetermined wavelength of light is passed, the substrate having a bottom surface and an upper surface, the upper surface comprising a series of pits shaped and arranged to define data carried by the medium;b. a reflective film stack carried by the upper surface of the substrate, the film stack comprising:(i) a reflective layer formed of a reflective metal, the reflective layer being sufficiently reflective of light of said predetermined wavelength and having a forward face substantially conforming to a profile of the pits to enable generation of a readable data stream from the reflected light; and(ii) an overlayer spaced farther from the substrate bin and reflective layer, the overlayer being formed of a material which has a higher Young's modulus than a reflective metal and is less reflective of light at said predetermined wavelength than is said reflective metal of the same thickness; andc. a protective layer carried behind the reflective film stack.