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:
May. 15, 2007
Filed:
Apr. 07, 2005
Applicants:
Yuichi Yamamoto, Tochigi, JP;
Yukio Shoji, Tochigi, JP;
Nobumi Yoshida, Tochigi, JP;
Inventors:
Assignee:
Komatsu Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G01B 7/14 (2006.01); G01B 7/30 (2006.01);
U.S. Cl.
CPC ...
Abstract
A plurality of Hall ICsA,B are disposed around a magnetic rodthat is movable along a central axis. The Hall ICs are disposed in different positions in terms of both a straight line distance coordinate in the direction of the central axis and a rotational angle coordinate around the central axis. The amount of displacement of the magnetic rodis calculated based on the average of output signals from the Hall ICs. Errors in the output signals due to a shift and tilt of the magnetic rod are detected and calibration of the measurement method is carried out.