Patent ID: 7400141
Filing Date: 2008-07-15
Classification: G01D,Y10T

Abstract:
1. A method of producing a magnetic type angle sensor, said magnetic type angle sensor comprising a rotary body and a magnetic sensing device arranged facing said rotary body and sensing a change in a magnetic field along with rotation of said rotary body, said rotary body including a first sensed part provided on a circumferential surface thereof with a plurality of recessed parts and projecting parts alternately at equal intervals in a circumferential direction thereof and a second sensed part provided on the circumferential surface thereof with a projecting part at only one location, said method comprising the steps of: providing a gear-shaped member including a first portion to be formed into said first sensed part and a second portion to be formed into said second sensed part; forming an annular groove on the circumferential surface of said gear-shaped member between said first portion and said second portion; and forming said second sensed part by removing all of the projecting parts except at one location from the second portion.