Appeal No. 95-1109
Application 07/917,380
the pickup is initially positioned at an "LD determination
position" which is beyond the CD diameter (figure 2) and a
focus lock is attempted. If a focus lock is obtained, an LD is
present, and the pickup moves to the LD playing start position
to begin playing (figure 4, steps S43, S44). If no focus lock
is obtained, a CD may be present, and the pickup moves to the
CD playing start position. If a focus lock is obtained, a CD
is present, and playing begins, whereas if no lock is obtained,
no disk is present (figure 4, steps S45-S48). The problem is
that delay results because it is always necessary to check that
an LD is not loaded. Otsubo's improvement is the inclusion of
a manual switch from which a person may select the type of disk
to be played and circuitry which assumes that the next disk
type is the same as the last, to place the pickup in its
initial playing position, thereby decreasing the time needed to
determine which type of disk is loaded. The flowchart using a
CD playing mode switch is shown in figure 3 (where steps
S24-S31 at the lower right correspond to the prior art in
figure 4). The absence of a disk is sensed by the failure to
obtain a focus lock in either the CD playing start position or
the LD determination position (e.g., col. 4, lines 64-65;
col. 5, lines 57-60).
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Last modified: November 3, 2007