The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 2010
Filed:
Apr. 24, 2008
Kazuki Kajikawa, Daito, JP;
Futoshi Takeda, Daito, JP;
Toshiaki Fukui, Daito, JP;
Kazuhiro Ichikawa, Daito, JP;
Kazuto Kitagawa, Daito, JP;
Kazuki Kajikawa, Daito, JP;
Futoshi Takeda, Daito, JP;
Toshiaki Fukui, Daito, JP;
Kazuhiro Ichikawa, Daito, JP;
Kazuto Kitagawa, Daito, JP;
Funai Electric Co., Ltd., Daito-shi, JP;
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 () includes a spindle motor () which rotates a disc (), a differential operational amplifier () which successively detects output voltages of the spindle motor (), and a failure judgment unit () which calculates an average voltage of the plural output voltages and judges whether or not the spindle motor () 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 () judges that the spindle motor () is at fault. Consequently, the failure judgment unit () can rapidly and accurately judge the failure in the spindle motor () without the influence from the unexpected change of the output voltages.