Appeal No. 2000-1243
Application 08/826,112
at 2, ll. 21-22. Figures 1 and 5, which represent two
embodiments of the invention, are reproduced below.
In
both embodiments, the partially reflective layer (16, 56)
overlies a pit pattern (15, 55) formed in the upper surface of a
transparent substrate (14, 54). Overlying the partially
reflective layer (16, 56) is a transparent spacer layer (18, 58)
whose upper surface has formed therein another pit pattern (19,
59) on which is formed a highly reflective layer (20, 60), such
as aluminum. Specification at 6, ll. 3-8. The term "pit
pattern" refers to "any pattern of pits or grooves that is
capable of storing information, be it data, servo or tracking
information, format information, etc." Id. at 4, ll. 18-20. The
Figure 1 embodiment employs a single detector 32 and a single
laser 30 which can be selectively focused onto either of the pit
2
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