Appeal No. 1998-3365
Application No. 08/673,214
information, an optical head moving means and an optical disk
supporting and rotating means. The invention particularly
relates to a recess created by protrusions in a rotor unit
which form a space that the optical head goes into when the
head is moved to a position corresponding to an innermost
portion of the optical disk.
Representative claim 1 is reproduced as follows:
1. An optical disk apparatus comprising:
an optical head for writing and reading information to
and from an optical disk while being opposed thereto;
optical head moving means for moving the optical head in
a radial direction of the optical disk;
disk supporting and rotating means including:
a pole-shaped portion extending along a rotation axis
of the optical disk;
a rotor unit which has a rotor magnet and rotates while
supporting the optical disk; and
a stator unit having a stator coil that is disposed in
the vicinity of the rotor magnet,
the rotor unit including first and second protrusions
extending outward from the pole-shaped portion so as to form a
recess in between, the first protrusion being a portion for
supporting the optical disk while contacting with it, the
second protrusion being a portion for accommodating the rotor
magnet, and the recess being a space which the optical head
goes into when it is moved to a position corresponding to an
innermost portion of the optical disk, wherein a sum of a
2
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