Patent ID: 8096710

Claim:
A rotor for use in a rotary encoder comprising: a pulser ring magnetized in a manner that N-polarity and S-polarity appear alternately along a circumferential direction thereof; and a core for mounting the pulser ring to an outer periphery of a rotary shaft, the core including: a cylindrical portion fitted on the outer periphery of the rotary shaft; and a mounting flange extending radially outwardly from one axial end of the cylindrical portion, the mounting flange being mounted with the pulser ring, wherein a corner portion formed between the cylindrical portion and the mounting flange constitutes a protrusion unitized with the cylindrical portion and the mounting flange, protruded from the one axial end of the cylindrical portion and opened toward the other axial end thereof, and a part of the pulser ring is disposed in the protrusion.