Appeal No. 98-0599
Application 08/434,029
surface to the second surface, the transparent
substrate also having a recess portion formed in the
first surface around the center hole and an annular
rib projecting from the second surface around the
center hole;
a recording layer formed on the first surface of
the transparent substrate;
a magnetic member inserted into the recess
portion of the transparent substrate, the magnetic
member closing the center hole of the transparent
substrate; and
a cartridge body for containing the transparent
substrate, the recording layer and the magnetic
member, the cartridge body having a first cartridge
surface opposite the first surface of the
transparent substrate, the cartridge having a second
cartridge surface opposite the second surface of the
transparent substrate, with the second cartridge
surface having a recording/reproducing aperture and
having a central aperture with the annular rib
projected therein.
36. An optical disc comprising:
a single-piece disc-shaped transparent substrate
having a first surface, a second surface parallel to
the first surface, and a center hole formed at a
center of the disc-shaped transparent substrate,
with the center hole extending through the
transparent substrate in a direction from the first
surface to the second surface, the transparent
substrate also having a recess portion formed in the
first surface around the center hole and an annular
rib projecting from the second surface around the
center hole;
a recording layer formed on the first surface of
the transparent substrate; and
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