Disc apparatus

Details Disc apparatus Disc apparatus

2008-01-04

2010-02-02

Leykin, Rita (Department: 2837)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

C361S023000, C361S030000, C361S033000, C361S110000

Reexamination Certificate

active

07656625

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 (1) includes a spindle motor (3) which rotates a disc (2), a differential operational amplifier (5) which detects a difference between voltages of a positive terminal and a negative terminal of the spindle motor (3) as a detecting voltage level, a failure judgment unit (10) which judges whether or not the spindle motor (3) is at fault based on the detecting voltage level, and a disc determination means (12) which determines a type of the disc (2). The failure judgment unit (10) judges that the spindle motor (3) 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 (3) starts driving when the disc (2) is in stopped state while the disc determination means (12) determines the type of the disc (2). Consequently, the failure judgment unit (10) can accurately judge the failure in the spindle motor (3) without extending the start-up time.

REFERENCES:
patent: 5506539 (1996-04-01), Kelly et al.
patent: 6107926 (2000-08-01), Kifuku et al.
patent: 6512346 (2003-01-01), Yoshimura
patent: 6778930 (2004-08-01), Sugawara et al.
patent: 7053676 (2006-05-01), Kranz
patent: 7237060 (2007-06-01), Satou et al.
patent: 10-191551 (1998-07-01), None
patent: 2001-298988 (2001-10-01), None

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