| 摘要 |
PROBLEM TO BE SOLVED: To provide a revolution detector which allows accurate integration and does not affect the input signal to an integration part even if the output signal of a sensor chatters. SOLUTION: First and second sensor means 3 and 4 which detect revolution and revolutional direction of a body revolution, first and second waveform shaping means 5 and 6, a power supply control means 12 which supplies the sampling pulse of a power source voltage intermittently at a constant cycle, for a short time, to the first and second sensor means 3 and 4 and the first and second waveform shaping means 5 and 6, first and second latch means 7 and 8, a power source circuit 11 which continuously supplies a power to the first and second latch means 7 and 8, a forward/reverse judging means 9 which judges revolutional direction of the body of revolution, and an integration mean 10 which counts revolution of the body of revolution, are provided. Here, a first feedback resistor 13 which feeds back the output of the first latch means 7 to the input of the first waveform shaping means 5 and a second feedback resistor 14 which feeds back the output of the second latch means 8 to the input of the second waveform shaping means 6, are provided.
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