Appeal 2006-2650
Application 10/011,886
Tyan
12) Tyan teaches GeTe based optical recording media where the Ge
content is 45-70%.
13) Tyan discloses that GeTe films have increased contrast, corrosion
resistance, data stability and a high erasure rate (less than 1
microsecond). (Col. 2, ll. 22-40).
14) The reflectance change is sharpest for 49.9% Ge (Fig. 4), which also
has high contrast (Fig. 3).
Uno
15) Uno teaches that crystallization enhancing layers protect the recording
layer from oxidation, corrosion, distortion and the like.
16) Uno teaches that crystallization enhancing layers prevent migration of
atoms from the protective layers into the recording layer, which is
especially important when the protective layers contain sulfur or
sulfides. (Col. 5, l. 44 – Col. 6, l. 25).
17) Uno discloses that crystallization acceleration layers may be various
nitrides, oxide, oxynitrides or carbides, including SiN, AlN, SiO2,
Ta205 and SiC. (Col. 7, ll. 9-30). The crystallization acceleration
layers may be 1-40 nm thick. (Col. 10, ll. 61-65).
Kobayashi
18) Kobayashi discloses the addition of nitrogen to GeTe films in amounts
of 5% as the average content of the film.
19) Kobayashi teaches that the addition of nitrogen, particularly when
graded with increasing amounts of nitrogen in the middle of the film
toward the protective layer, prevents oxidation of the medium and
8
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Next
Last modified: September 9, 2013