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:
Jul. 20, 2010
Filed:
Sep. 28, 2007
Yasumasa Igi, Osaka, JP;
Yasumasa Igi, Osaka, JP;
Funai Electric Co., Ltd., Osaka, JP;
Abstract
An optical disc device includes: a spindle motor for rotating a disc; a motor driving circuit for applying a voltage to the spindle motor to drive the spindle motor; an optical pickup for irradiating the disc with an optical beam; and a detector for, after the motor driving circuit starts voltage application to the spindle motor, measuring a pit length based on reflection light, on the disc, of the optical beam irradiated by the optical pickup and then detecting based on a result of the measurement that the spindle motor is in short condition. In the optical disc device, upon detection by the detector that the spindle motor is in short condition, the motor driving circuit stops the voltage application to the spindle motor.