Appeal No. 2000-1243
Application 08/826,112
patterns. Id. at 5, ll. 4-8. In the Figure 5 embodiment, lasers
70 and 74 and detectors 80 and 84 use different wavelengths (780
nm and 650 nm) to read pit patterns 59 and 55, respectively.
This permits the same disk to be read in either a standard 780 nm
CD-ROM drive or in a standard 650 nm DVD-ROM drive. Id. at 3,
ll. 10-20.
Figure 4, reproduced below, shows the apparent
reflectivities obtained when selectively reading both layers with
a wavelength of 650 nm (the Figure 1 embodiment). The filled
circles represent the apparent reflectivity of the Sb 2S3
partially reflective layer 16 and the open circles represent the
apparent reflectivity of an AlCr highly reflecting layer 20. The
apparent reflectivities vary by less than 0.12 over a range of
thickness of the Sb2S3 layer from about 27 to 80 nm and are even
more closely balanced over the ranges from 30 to 40 nm and 65 to
75 nm. Id. at 9, ll. 19-26.
Figure 6, reproduced
below, shows the apparent
3
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