Appeal 2007-0409
Application 10/479,203
(7) Nonaka discloses an optical recording medium wherein recording and
erasure of information are affected by reversible phase change
between the amorphous phase and the crystalline phase of the
recording layer. (Abstract).
(8) Nonaka describes conventional rewritable phase change type optical
recording medium technology as follows:
The conventional optical recording media have a
recording layer mainly composed of tellurium, etc., and
for recording, the recording layer in the crystalline state
is irradiated with focused laser beam pulses for a short
time, to be partially molten. The molten portions are
quickly cooled and solidified by thermal diffusion, to
form recorded marks of the amorphous state. The light
reflectance of the recorded marks is lower than that of the
crystalline state, and they can be optically reproduced as
recorded signals. For erasing, the recorded marks are
irradiated with a laser beam, to be heated to a
temperature lower than the melting point and higher than
the crystallization point of the recording layer, to
crystallize the amorphous recorded marks, for restoring
the original non-recorded state. [0002].
(9) Nonaka’s recording medium comprises, in order, a substrate, a first
dielectric layer, a first boundary layer, and a recording layer.
(Abstract). A second boundary layer may be formed on the recording
layer on the side opposite the first boundary layer. [0023].
(10) The boundary layers are mainly composed of oxides, carbides and
nitrides of elements belonging to group 3A through group 6B of the
2nd period through the 6th period in the periodic table which include In,
Sn, Zn, Al, and Si [0026].
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