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:
Aug. 30, 2005
Filed:
May. 13, 2002
Applicants:
Kenji Yoshida, Maebashi, JP;
Hiroshi Satou, Takasaki, JP;
Kenji Nishimura, Takasaki, JP;
Inventors:
Assignees:
Hitachi ULSI Systems Co., Ltd., Tokyo, JP;
Renesas Technology Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B005/596 ;
U.S. Cl.
CPC ...
Abstract
In a magnetic disk storage apparatus, when power supply is stopped, a magnetic head can be retracted safely and quickly so as not to be damaged. There are provided a back electromotive a force detector that detects back electromotive forces developed in coils of a voice coil motor for moving a magnetic head when power a supply is stopped, and a brake controller that judges a movement speed of the magnetic head from the detected back electromotive forces, and brakes the voice coil motor when the movement speed is greater than a preset first limited speed.