| 摘要 |
PURPOSE:To make it possible to detect a plurality of angle data continuously, to detect the change in number of rotation minutely, and to make the control accurate, in a rotary signal detecting device, by providing a plurality of different threshold values, and performing a parallel comparison with a waveform shaped output. CONSTITUTION:A voltage signal from a sensor is supplied to an inverted voltage controlling and amplifying circuit which is constituted by an amplifier 13 and resistors 3-5 and 12. The amplified output is imparted to a resistance value controlling circuit part which comprises an FET6, a resistor 7, a capacitor 8, a diode 15, and Zener diode 16. When the inverted amplified output from an amplifier 13 is changed to the negative direction and the value, which is set by the diodes 15 and 16 forming a maximum amplitude detecting circuit, is exceeded, automatic control is performed so that the resistance value of the FET6 as a variable resistor element becomes small, the amplification factor at the circuit part becomes small, and the maximum amplitude of the output of an AGC becomes a preset value. The output signal of the amplifier 13, whose maximum amplitude is made to be constant, and the threshold voltage from a variable resistor 10 is imparted to a comparator 14. Thus the angle data corresponding to the threshold values which are arbitrarily set, are obtained. |
