Patent ID: 7728582

Claim:
A pulsar ring of a magnetic type rotary encoder comprising: an annular holder made of a metal; and a pulsar main body integrally formed on the holder by a magnetic rubber material, wherein said holder is provided with: a disc portion to which said pulsar main body is bonded, a mounting tube portion having a smaller diameter than an outer diameter of the disc portion and being fixed to a rotating body, a fold-back portion folded back from an outer circumference of said disc portion toward a location spaced apart from an inside surface of said disc portion so as to form a round convex surface at an outer circumferential side thereof, and an intermediate portion extending from the fold-back portion to said mounting tube portion, and wherein an outer circumferential portion of said pulsar main body is provided with a guide portion, the guide portion being: formed so as to surround an outer circumference of said fold-back portion, capable of coming into close contact with an inner circumferential surface of a cylindrical circumferential wall portion of a pressure inserting jig with a suitable collapsing margin, and formed in: a share continuously or intermittently protruding to an outer circumferential side in a circumferential direction, or a seal lip shape.