Appeal No. 2006-0467
Application No. 10/063,004
We observe that Sandstrom teaches that the “rewritable optical
data storage media” has a reflective layer 14, a first dielectric
layer 16, a recording layer 18, a second dielectric layer 20, and
a third dielectric layer 22 in order on a substrate 12. See
Figure 1, in conjunction with column 5, lines 19-33. We observe
that Sandstrom further teaches (column 6, line 62 to column 7,
line 15) that:
In an air-incident construction, the optical
characteristics of substrate 12 are largely irrelevant.
Specifically, because the beam does not enter disk 10
through substrate 12, the optical properties of the
substrate have no direct optical effect on performance. In
contrast, substrate-incident disks typically require
substrates having particular optical properties. Thus, in
an air-incident disk, it is conceivable that a wider array
of materials may be used to fabricate substrate 12. Also,
such materials could be less expensive than higher grade
optical materials. For example, substrate 12 can be formed
from a variety of materials including thermosets,
thermoplastics, metal, or glass. The selected materials can
be transparent or opaque. Also, such materials could be
selected in part on the basis of the applicable elastic
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