| 摘要 |
PURPOSE:To obtain satisfactorily the outputs for respective positions having no drop- out with good accuracy by detecting the position of a rotating body where drop-out arises, generating the output for a reference position, summing the output signals of the respective sensors and generating the output for the angle position having no drop- out. CONSTITUTION:Angle sensors 40 and 50 consisting of magneto-resistance elements are disposed so as to face to each other on the outside circumference of a disc 30 which is a rotating body. The output from the sensor 40 is made into a rectangular wave having a drop-out by a shaping circuit 60, and the output from the sensor 50 is made into a rectangualr wave having a drop-out in a prescribed position by a shaping circuit 80. The respective rectangular waves pass through an AND circuit 700, by which the rectangular wave having no drop-out is formed. An FF consisting of NAND circuits 703, 704 is set by the rise of the output signal of an AND circuit 702. The rise waveform of the output signal of the circuit 700 is differentiated 12, and the point of the time when each differentiation signal is generated at a terminal 11a is an angle position. The rise waveform of the output signal of the FF is differentiated 13 and the point of the time when the differentiation signal at a terminal 9a is generated is a reference position. |
