Appeal No. 1997-1230
Application 08/274,807
cover plate 58 so that the clamp unit is free to rotate
relative to the lid. See Figures 9 and 12. In use, a compact
disk D is received in the case between the upper and lower
halves of the housing (see Figure 12) for driving engagement
with a drive spindle assembly 140 of a disk drive unit. To
this end, the disk drive unit includes a table member 135 that
engages the lower surface of the disk and a magnetic holding
member 147 that extends through a central opening 120 of the
disk. As explained at column 8, lines 41-53:
When the disk D is mounted to the disk table 135 in
this manner, the magnetic plate 141 secured to the
clamper 40 is magnetically attracted by the magnet
146 and the centering surface 56 is engaged with the
clamper centering surface 148 of the magnet holding
member 147 so that the clamper 40 is attracted onto
the disk table 135 with correct centering to the
magnet holding member 147. The clamper 40 can be
rotated in unison with the disk table 135 with the
disk supporting member 57 pushing against the
perimeter of the center opening 120 of the disk D to
force the disk against the disk table 135 and to
clamp the disk D in cooperation with the disk table
135.
According to the examiner (answer, page 5), Sakaguchi
discloses a disk cartridge 21 comprising, inter alia, a hub 40
to which disk D is mounted, and a screw top 41 mated to the
6
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