Stock material or miscellaneous articles – Circular sheet or circular blank
Patent
1994-03-10
1996-03-19
Ryan, Patrick J.
Stock material or miscellaneous articles
Circular sheet or circular blank
428 642, 428 644, 428 648, 430945, 4302701, 369277, 369283, 369279, B32B 300
Patent
active
055002668
ABSTRACT:
When a dye material layer is spin-coated on an optical storage medium of the type having grooves fabricated in a substrate thereof, the dye material layer surface has depressions in the vicinity of the grooves. These depressions have a profile which is a function of the distance from the center of the storage medium. To compensate for the radial dependence of the depressions, the geometry of the grooves is changed by varying the base dimension of the groove as a function of the distance from the center of the storage medium. In this manner, the difference in phase for radiation traversing the storage medium by an optical path that includes a groove as compared to an optical path that does not include an associated groove is constant as a function of distance from the center of the storage medium. The phase difference which is a constant as a function of distance from the center of the storage medium is important in the generation of signals used in tracking the groove.
REFERENCES:
patent: 5080946 (1992-01-01), Takagisi
patent: 5213859 (1993-05-01), Aoi
patent: 5316814 (1994-05-01), Sawada
patent: 5344682 (1994-09-01), Mizukuki
Eastman Kodak Company
Evans Elizabeth
Everett John R.
Ryan Patrick J.
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