Appeal No. 1998-0601
Application 08/225,322
and (3) a range of read levels from some minimum reliable read
value to some maximum value that safely will not write (a
range of power levels suitable for reading data). The
selection of any of these three levels would have been
suggested to one skilled in the art. Further, since Miura
uses a single laser as a light source for the tracking control
and focusing control as well as to read and write data, one of
ordinary skill in the art would have been motivated to reduce
the power level to a read level because this is a standard
laser operating level and would maintain the laser power level
for tracking control and focusing control which is necessary
for continuous operation. That is, if the power level was
turned off or reduced to a level below the read level after an
abnormal tracking error, the power level would need to be
restored to the read level to continue operations of tracking,
focusing, and reading addresses and one of ordinary skill in
the art would have sought to avoid these interruptions.
Appellant argues that Miura provides no guidance with
which to select a particular power level, much less suggesting
that it be reduced to a level suitable for reading data (Br15;
RBr6). However, since the claimed "level suitable for a data
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