Optical recording medium

Details Optical recording medium Optical recording medium

1998-09-15

2000-03-21

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 644, 428913, 43027013, 4304951, 430945, 3692751, 3692754, B32B 300

Patent

active

060400307

ABSTRACT:
A method for recording/reproducing an optical recording medium of phase change type is provided. The method enables a high density recording while increase in the cross erase is suppressed. The method also enables an accurate tracking while increase in the crosstalk is suppressed. The method is adapted for use with an optical recording medium of phase change type comprising a substrate having a thickness of up to 0.8 mm wherein lands and grooves on opposite sides of the land are formed on the surface, and both the lands and the grooves are used as recording tracks, and the medium is overwritten at a recording power Pw (mW) and an erasing power Pe (mW) which meet the relation: (Pw/Pe).times.k.sup.2 .ltoreq.8.5, when the medium has a recording track pitch P (.mu.m), the recording/reproducing optical system has a numerical aperture NA, and the recording/reproducing light has a wavelength .lambda. (.mu.m) which meet the relation: k=(.lambda./NA)/P.gtoreq.1.78.

REFERENCES:
patent: 5581539 (1996-12-01), Horie et al.
patent: 5652037 (1997-07-01), Ohkawa et al.
patent: 5848043 (1998-12-01), Takada et al.
Related Case "Docket Number 0083-0878-2*, Serial or Patent No. 09/153,294, Filing or Issue Date 09/15/98, Status or Patentee Pending".
Related Case "Docket Number 0083-0949-2, Serial or Patent No. 09/247,085, Filing or Issue Date 02/09/99, Status or Patentee Pending".

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