Optical recording medium

Details Optical recording medium Optical recording medium

1998-12-24

2000-08-01

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

B32B 302

Patent

active

060964006

ABSTRACT:
In a phase change-type optical recording medium of absorption coefficient control structure used by land/groove recording system, difference in reproduction characteristics between the land and the groove is minimized while ensuring sufficient output of the tracking signal. In the optical recording medium of the present invention, light absorption coefficient at the wavelength of said recording/reproducing beam is such that: Ac/Aa.gtoreq.0.8 when light absorption coefficient in crystalline region is Ac and light absorption coefficient in amorphous region is Aa; relation between groove width W.sub.G and land width W.sub.L is such that: x=2W.sub.G /(W.sub.L +W.sub.G).gtoreq.1.03; and the relation: .lambda.max.sup.i <.lambda.u.ltoreq..lambda.min.sup.i, and -100x+123.ltoreq.t.sub.R .ltoreq.-100x+126 are satisfied when the wavelength of a local minimum in reflectance spectrum is .lambda.min.sup.i ; the wavelength of the local maximum in the reflectance spectrum nearest to the .lambda.min.sup.i in the wavelength range shorter than the .lambda.min.sup.i is .lambda.max.sup.i ; said recording/reproducing beam has a wavelength of .lambda.u; and said recording layer has a thickness of t.sub.R (nm).

REFERENCES:
patent: 5650992 (1997-07-01), Ohkubo
patent: 5719006 (1998-02-01), Ohkubo
patent: 5978349 (1999-11-01), Yoshinari
patent: 6040030 (2000-03-01), Utsunomiya

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