| 摘要 |
There is provided a capacity type rotation detecting apparatus which comprises a first insulating circular plate having on one surface thereof at least one pair of sets of electrode pieces arranged circumferentially and connected electrically to one another and at least one ring-shaped electrode, a second insulating circular plate having on one surface thereof at least one set of electrode pieces arranged circumferentially to face the at least one pair of sets of electrode pieces on the first insulating circular plate and connected electrically to one another and at least one ring-shaped electrode arranged to face the at least one ring-shaped electrode on the first plate and connected electrically to the at least one set of electrode pieces on said second plate, and a periodic signal supply circuit for applying periodic signals of opposite phase to the at least one pair of electrode-piece sets, respectively, on the first insulating circular plate, whereby, when the first and second insulating circular plates are placed facing each other and rotated relative to each other, the phase relation between the periodic signals transmitted to the at least one ring-shaped electrode on the first insulating circular plate through the capacitance formed between the opposite electrodes of the first and second plates and the periodic signals from the periodic signal supply circuit is detected and a rotational position signal and a reference angular position signal are generated simultaneously in accordance with the results of the phase detection.
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