Patent ID: 7011876

Claim:
An optical recording medium comprising: a reflecting film; a first transparent film provided on the reflecting film; a first semitransparent film provided on the first transparent film; a second transparent film provided on the first semitransparent film; a recording film provided on the second transparent film, the recording film being capable of reversibly changing an atomic arrangement; and a third transparent film provided on the recording film, wherein the first transparent film has a thickness of 6 nm or more but 20 nm or less, the third transparent film has a thickness of 6 nm or more, the first semitransparent film has a heat conductivity ten times or more as high as that of the first and third transparent film, and the first semitransparent film has a complex refractive index of n−ik satisfying relationships of 0<n<1 and 1<k.