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. 14, 2018
Filed:
May. 19, 2017
Dmg Mori Seiki Co., Ltd., Yamato-Koriyama, Nara, JP;
Masaaki Kusumi, Isehara, JP;
Yusuke Takei, Isehara, JP;
Shigeru Ishimoto, Isehara, JP;
Mitsugu Yoshihiro, Isehara, JP;
DMG MORI SEIKI CO., LTD., Yamato-Koriyama, JP;
Abstract
A magnetism detecting element detects a leakage magnetism from a scale, on which a magnetic signal with a constant period is recorded, and a relative position between the scale and the magnetism detecting element is detected. The magnetism detecting elements are arranged, along a detection direction of the magnetic signal relative to the scale, in a pattern with a pitch of ½n (n is a prime number of 3 or more) of a wavelength λ' of a signal output by the element. Furthermore, as the pattern for cancelling m odd-order harmonics, the m-th power of 2 magnetism detecting elements are arranged within a range in which a pitch distance L of the magnetism detecting element farthest in the detection direction is expressed by L=(λ′/2)×(⅓+⅕+ 1/7+ . . . 1/(2m+1)).