Appeal No. 2000-0617
Application 08/706,025
mounting having a second concave bearing surface centered
about said axis and in contact with said second ball; and
a rotor comprising:
(a) a rotor housing;
(b) means for imparting torque to said rotor in response
to an electro-magnetic field generated by said stator;
(c) a third concave bearing surface centered about said
axis and in contact with said first ball, said third concave
bearing surface opposing said first concave bearing surface
along said axis, said first and third concave bearing surfaces
confining said first ball, and
(d) a fourth concave bearing surface centered about said
axis and in contact with said second ball, said fourth concave
bearing surface opposing said second concave bearing surface
along said axis, said second and fourth concave bearing
surfaces confining said second ball;
wherein said third concave bearing surface and said
fourth concave bearing surface are positioned between said
first concave bearing surface and said second concave bearing
surface, said rotor being supported entirely by said first and
second balls.
The Nagata reference
10. Nagata discloses a bearing system in a motor for a
floppy disk drive.
11. Nagata describes a rotor 8 supported at one end by a
pivot bearing 11 and at the other end by a pivot bearing 23.
(Fig. 1).
12. The pivot bearings 11 and 23 each comprise three
4
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