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Capacity type rotation detecting apparatus

  • US 4,477,810 A
  • Filed: 09/01/1982
  • Issued: 10/16/1984
  • Est. Priority Date: 09/07/1981
  • Status: Expired due to Fees
First Claim
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1. A capacity type rotation detecting apparatus comprising:

  • a first plate having a plurality of electrode pieces of a first input electrode and a plurality of electrode pieces of a second input electrode arranged along a circumference at respective equally given intervals and contiguously intermeshed, said first input electrode pieces forming a first input reference angular position detection electrode comprising a set of said first input electrode pieces selected at respective different intervals and further forming a first input rotational angle detection electrode comprising a set of said first input electrode pieces other than said first input reference angular position detection electrode pieces, and said second input electrode pieces forming a second input reference angular position detection electrode comprising a set of said second input electrode pieces each thereof being positioned adjacent to one of said first input reference angular position detection electrode pieces on one side thereof and further forming a second input rotational angle detection electrode comprising a set of said second input electrode pieces other than said second input reference angular position detection electrode pieces,a second plate having output reference angular position detection electrode means arranged to face said first and second input reference angular position detection electrodes and output rotational angle detection electrode means arranged to face said first and second input rotational angle detection electrodes;

    a first periodic signal supply circuit for supplying periodic signals of opposite phase to said first and second input reference angular position detection electrodes;

    a second periodic signal supply circuit for supplying periodic signals, which are of opposite phase to each other and have a repetition period different from that of said periodic signals supplied to said first and second input reference angular position detection electrodes, to said first and second input rotational angle detection electrodes;

    a reference angular position signal generating circuit for generating a reference angular position signal in response to signals generated at said output reference angular position detection electrode means when said second plate is rotated relative to said first plate;

    a rotational angle signal generating circuit for generating a rotational angle signal in response to signals generated at said output rotational angle detection electrode means; and

    signal transmitting means for transmitting signals between said second plate and said first plate which is fixed.

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