Appeal No. 1998-0601
Application 08/225,322
Miura discloses that the energy of the laser is lower in
a read mode than a write mode (col. 2, lines 25-28). Miura
recognizes that tracking control in the prior art is defective
in that when there is a tracking error "other information will
be recorded on the track having information recorded thereon
already or such information will be erroneously recorded on a
track on which it is not to be recorded" (col. 3,
lines 61-64). Miura discloses control means generating a
control signal for reducing or interrupting the output energy
of the light beam generated from the recording means when the
tracking failure detection circuit generates a tracking
failure to inhibit recording of information (e.g., col. 4,
lines 21-28; col. 6, line 64 to col. 7, line 12). We
interpret this to teach that the power level can be reduced to
a range between zero (if the power is interrupted) and a safe
level at which writing cannot occur. The actual write level
may be greater than the upper end of this range to ensure a
high enough power for reliable writing. The actual read level
is less than or equal to the upper end of the range since it
is known that the read level is a power level that will not
record.
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