| 摘要 |
PCT No. PCT/JP95/02381 Sec. 371 Date May 27, 1997 Sec. 102(e) Date May 27, 1997 PCT Filed Nov. 22, 1995 PCT Pub. No. WO96/17344 PCT Pub. Date Jun. 6, 1996A phase-change type optical recording medium, wherein (1) recording, erasing and reading of information by irradiating light is possible, and the medium has a structure in which a first protective layer, a recording layer, a second protective layer, and a reflective layer are consecutively deposited in this order on a transparent substrate, (2) the thickness of the first protective layer is in the range of the thickness, where reflectivity of light on irradiating the layer from the side of the transparent substrate exhibits a minimum, +/-30 nm, and (3) the second protective layer has the absorption coefficient k satisfying the equation as follows0.05</=k</=2.5.According to the present invention, unevenness of shapes and sizes of the recording pits can be reduced, irrespective of whether the state of the recording layer is crystalline or amorphous. Resultantly, the present invention can provide an optical recording medium having an improvement in erasability and reduction of jitter, and having excellent error rate.
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