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:
Apr. 24, 2012
Filed:
Oct. 21, 2010
Takeshi Yamamoto, Kanagawa, JP;
Atsushi Shimaoka, Kanagawa, JP;
Takeshi Yamamoto, Kanagawa, JP;
Atsushi Shimaoka, Kanagawa, JP;
Mitutoyo Corporation, Kawasaki-shi, JP;
Abstract
A position controller provided in a controlling module obtains a difference between a detected rotation angle of a stylus and a target rotation angle, and determines an energization amount to a voice coil motor so that the difference becomes zero. A variable limiter circuit limits a driving current, which is supplied from the position controller, to a limitation value so that a rotation force applied to the stylus from the voice coil motor is constant. A target rotation angle issuing portion switches over the target rotation angle based on a relative position of a contact portion of the stylus.