Appeal No. 2000-1243
Application 08/826,112
Nagashima's discussion of semi-
transparent film 3 is limited to
explaining that it is formed on data surface 2 by vacuum
deposition (col. 6, ll. 62-64) and is a dielectric material with
a refractive index that differs from that of the transparent
substrate material (col. 7, ll. 21-22). While Nagashima gives
the index of refraction for the substrate as approximately 1.5
(col. 4, ll. 48-49), no value is given for the index of
refraction of the semi-transparent film.
The examiner cites Horikago as evidence of the obviousness
of forming Nagashima's semi-transparent film 3 of antimony
sulfide. Horikago's Figure 1, reproduced below, shows an optical
recording medium having three recording layers, 2, 4, and 6
responsive to respective laser beams 8-10 having wavelengths of
82, 84, and 86.
8
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