Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Reexamination Certificate
2008-04-24
2010-11-09
Feild, Joseph H (Department: 2627)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
C361S006000, C361S007000, C361S018000, C361S023000, C361S033000, C361S042000, C361S043000, C361S086000, C318S494000, C318S798000, C318S806000, C318S808000, C388S806000, C720S695000, C360S069000, C369S053300, C369S196000
Reexamination Certificate
active
07830642
ABSTRACT:
A disc apparatus which can judge accurately whether or not a spindle motor is at fault due to a short circuit is provided.A disc apparatus (1) includes a spindle motor (3) which rotates a disc (2), a differential operational amplifier (5) which successively detects output voltages of the spindle motor (3), and a failure judgment unit (10) which calculates an average voltage of the plural output voltages and judges whether or not the spindle motor (3) is at fault in accordance with the average voltage and the output voltages. When counting number of occurrences of a specific state which indicates that one of the two output voltages detected successively is larger than the average voltage and other of the two output voltages is smaller than the average voltage, the failure judgment unit (10) judges that the spindle motor (3) is at fault. Consequently, the failure judgment unit (10) can rapidly and accurately judge the failure in the spindle motor (3) without the influence from the unexpected change of the output voltages.
REFERENCES:
patent: 6489738 (2002-12-01), Bates et al.
patent: 6876531 (2005-04-01), Nakazawa et al.
patent: 2008/0106815 (2008-05-01), Kajikawa
patent: 2008/0164833 (2008-07-01), Kajikawa
patent: 2003-174795 (2003-06-01), None
Fukui Toshiaki
Ichikawa Kazuhiro
Kajikawa Kazuki
Kitagawa Kazuto
Takeda Futoshi
Crowell & Moring LLP
Feild Joseph H
Funai Electric Co. Ltd.
Iluyomade Ifedayo
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