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. 10, 2016
Filed:
Jul. 19, 2012
Applicant:
Masayuki Nara, Ibaraki, JP;
Inventor:
Masayuki Nara, Ibaraki, JP;
Assignee:
MITUTOYO CORPORATION, Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01C 17/38 (2006.01); G01D 5/38 (2006.01);
U.S. Cl.
CPC ...
G01D 5/38 (2013.01);
Abstract
An index error estimating apparatus used for an index error calibrating apparatus that has a grating disk supported by a rotation shaft and four detectors arranged on the grating disk. The index error estimating apparatus includes a detected value synthesizer that calculates a linear sum by multiplying by a predetermined coefficient each of detected values obtained from each of the at least four detectors; and a Fourier component identifier that uses a Fourier component of the linear sum and identifies a Fourier component of the index error.