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:
Feb. 02, 2010
Filed:
Jan. 04, 2008
Kazuki Kajikawa, Daito, JP;
Kazuki Kajikawa, Daito, JP;
Funai Electric Co., Ltd., Daito-shi, JP;
Abstract
A disc apparatus which can accurately judge 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 detects a difference between voltages of a positive terminal and a negative terminal of the spindle motor () as a detecting voltage level, a failure judgment unit () which judges whether or not the spindle motor () is at fault based on the detecting voltage level, and a disc determination means () which determines a type of the disc (). The failure judgment unit () judges that the spindle motor () is at fault when the detecting voltage level becomes lower than a predetermined threshold level five times continuously during a start-up that the spindle motor () starts driving when the disc () is in stopped state while the disc determination means () determines the type of the disc (). Consequently, the failure judgment unit () can accurately judge the failure in the spindle motor () without extending the start-up time.