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Encoder | Codierer | Codeur

Patentnummer:EP2687821B1
IPC Hauptklasse:G01D0005244
Anmelder:Mitutoyo Corporation (0)
20-1, Sakado 1-chome, ; Takatsu-ku, ; Kawasaki, Kanagawa 213-0012, JP
Erfinder:Kato, Yoshiaki (0)
c/o Mitutoyo Corporation; 20-1 Sakado 1-chome; Takatsu-ku, Kawasaki; Kanagawa 213-8533, JP
Anmeldung:18.07.13
Offenlegung:18.07.12
Patenterteilung:11.07.18

Abstract / Hauptanspruch
An encoder includes a light receiving part and a computing part. The light receiving part 101 receives reflected light from a scale 10 and outputs N-phase sinusoidal signals in which respective phases of fundamental waves differ by 2π/N (N is an integer more than or equal to 5). The computing part 102 outputs a two-phase sinusoidal signal including an A phase and a B phase according to each of the N-phase sinusoidal signals. The A phase is expressed by a real part of sum of multiplier of N-phase sinusoidal waves and a member including the N. The B phase is expressed by an imaginary part of the sum of the multiplier of the N-phase sinusoidal waves and a member including the N.

EP2687821B1


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