Stock material or miscellaneous articles – Circular sheet or circular blank
Reexamination Certificate
2005-01-18
2005-01-18
Mulvaney, Elizabeth (Department: 1774)
Stock material or miscellaneous articles
Circular sheet or circular blank
C428S064400, C428S064800, C430S270140
Reexamination Certificate
active
06844043
ABSTRACT:
An optical disk includes a substrate, a reflection layer, an organic dye layer, a protection layer and a cover layer. When recording information on the optical disk by a laser beam, an organic dye expands due to heat generation caused by laser beam radiation. The laser beam passes through the cover layer of the optical disk during recordation. The information is recorded in grooves formed in the substrate. Hardness of a resin substrate side of the optical disk is higher than that of a cover layer side of the optical disk so as to propagate stresses generated by the thermal expansion of the organic dye toward the cover layer. The hardness relationship between the cover layer side and the substrate side should be established at least when the information is recorded on the optical disk. The optical disk can record the information more finely because deformations of the reflection layer are prevented when recording the information.
REFERENCES:
patent: 4990388 (1991-02-01), Hamada et al.
patent: 20030137921 (2003-07-01), Higuchi
patent: 20030148215 (2003-08-01), Kakuta et al.
patent: 20030203147 (2003-10-01), Usami et al.
patent: 2002-008269 (2002-01-01), None
Morgan & Lewis & Bockius, LLP
Mulvaney Elizabeth
Pioneer Corporation
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