| 摘要 |
PURPOSE:To generate the rotary angle pulse having a unit angle smaller than equally spaced angle of rotary angle reference bodies, by detecting the passage of the rotary angle reference bodies equally spaced around the outer surface of the rotary body, counting the number of high speed clock pulses at every period of the generated sensor signal, and generating the rotary angle pulse every time the high speed clock pulses are counted by the number which agrees with the value that is 1/N the counted value. CONSTITUTION:When the rotary body 1 is rotated in association with the rotation of a body whose rotation is to be detected, a sensor 3 detects the passage of tooth parts 2 and generates the output. A counter 7 counts the number of the clock pulse in every period of the sensor signal A and outputs the result. A latch circuit 8 divides the counted value Y of the pulse phi by using an expression 1/2n=1/N and accepts the result. A down counter 9 performs the down cout every time the pulse phi is supplied. When the counted value reaches a preset value, the rotary angle pulse D is generated from an output terminal OUT. The rotary angle pulse D whose frequency is multiplied by N=2n times, is outputted. Therefore the unit angle is made smaller to 1/N=1/2n in comparison with the conventional angle. |
