Appeal 2007-3146
Application 10/002,952
We AFFIRM.
INTRODUCTION
Appellants claim an optical data recording medium comprising, in
relevant part, a protective film, which is mainly comprised of a resin and is
formed on a thin film layer, wherein an expansion coefficient under
humidity of the protective film is greater than that of the transparent
substrate (claim 1).
Claims 1, 11, 12, 13, and 14 are illustrative:
1. An optical data recording medium comprising a transparent
substrate, a thin film layer formed on the transparent substrate and a
protective film which is mainly comprised of a resin and formed on the thin
film layer for protecting the thin film layer, wherein the thin film layer is a
single layered or multilayered film including at least any one of a dielectric
film, a recording film and a reflective film, and an expansion coefficient
under humidity [ratio of expansion (1/%) where a difference of relative
humidity (vapor content/saturated vapor amount at 25ºC) is increased by
1%] of the protective film is greater than that of the transparent substrate and
smaller than 5.5x10-5 (1/%) and the thickness of the protective film is 5 µm
to 20 µm.
11. An optical data recording medium according to claim 1, wherein
the expansion coefficient under humidity of the protective film is 7 or less
times as great as that of the transparent substrate, the expansion coefficient
under humidity being greater than 7 x 10-6 (1/%) and smaller than 5 x 10-5
(1/%), and a Young's modulus of the protective film is greater than 4.0 x 109
(Pa) and smaller than 1.0 x 1010 (Pa).
12. An optical data recording medium comprising a transparent
substrate, a thin film layer formed on the transparent substrate and a
protective film which is mainly comprised of a resin and formed on the thin
film layer for protecting the thin film layer,
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Last modified: September 9, 2013