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POSITION DETECTING DEVICE | POSITIONSBESTIMMUNGSVORRICHTUNG | DISPOSITIF DE DÉTECTION DE POSITION

Patentnummer:EP2918978B1
IPC Hauptklasse:G01D0005244
Anmelder:
Erfinder:Kusumi, Masaaki (0)
Sony Precision Techn. Inc., ; 9-17, Nishigotanda, 3-chome, ; Shingawa-ku, ; Tokyo, JP
Anmeldung:09.03.15
Offenlegung:10.03.14
Patenterteilung:06.03.19

Abstract / Hauptanspruch
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 1/2n (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) × (1/3+1/5+1/7+... 1/(2m+1)).

EP2918978B1


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