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:
Sep. 12, 2006
Filed:
Oct. 12, 2004
Takanori Okada, Moriguchi, JP;
Shuichi Yoshida, Osaka, JP;
Masaharu Imura, Neyagawa, JP;
Kiyoshi Masaki, Amagasaki, JP;
Kazuhiro Mihara, Moriguchi, JP;
Tsutomu Kai, Katano, JP;
Noritaka Akagi, Osaka, JP;
Masanori Harui, Minoh, JP;
Kazuhiko Kouno, Takatsuki, JP;
Takanori Okada, Moriguchi, JP;
Shuichi Yoshida, Osaka, JP;
Masaharu Imura, Neyagawa, JP;
Kiyoshi Masaki, Amagasaki, JP;
Kazuhiro Mihara, Moriguchi, JP;
Tsutomu Kai, Katano, JP;
Noritaka Akagi, Osaka, JP;
Masanori Harui, Minoh, JP;
Kazuhiko Kouno, Takatsuki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A disk drive apparatus for a disk having helically-formed or concentric circle-like formed tracks includes a spindle motor for controlling a rotation of the disk; a pick-up device for recording or reproducing information on or from the disk; a stepping motor for moving the pick-up device in a radial direction of the disk in accordance with a drive current; a system controller for tracking a rotation speed of the spindle motor and for outputting command signals according to the rotation speed of the spindle motor; and a stepping motor controller for controlling the stepping motor by changing a slope of a rising part and a falling part of a waveform of the drive current of the stepping motor according to the command signals.