Appeal No. 2000-1244
Application 08/826,111
reflective layer 16 has greater than 25% reflectivity at the
wavelength of interest. See page 7 of Appellants’ specification.
As shown in figure 3, the refractive index of amorphous
selenium also has a very low imaginary component (K) over a range
of wavelengths from 600 to 800 nm. A low K is necessary to allow
the double transmission of light through partially reflective
layer 16 without significant loss to enable readout of highly
reflective layer 20. See page 7 of Appellants’ specification.
Independent claim 1 present in the application is produced
as follows:
1. An optical storage medium from storing information in at
least two separate layers, the medium comprising, in order:
a transparent substrate having a pattern of pits in one
major surface thereof;
a partially reflective layer, adjacent the substrate,
comprising amorphous selenium;
a transparent spacer layer; and
a highly reflective layer;
wherein the medium is designed for use with a focused laser
beam having a wavelength 8 positioned to enter the medium
through the substrate, wherein the beam may be adjusted to be
focused on each of the partially reflective layer and the highly
reflective layer, and further wherein the partially reflective
layer has a thickness within ± 10% 8/4n8, where the partially
reflective layer has an index of refraction having a real
component (n) having a value measured at 8 of n8.
3
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