Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1982-09-01
1984-10-16
Groody, James J.
Communications: electrical
Continuously variable indicating
With particular transmitter
324 61R, 340347P, G08C 1910
Patent
active
044778104
ABSTRACT:
A capacity type rotation detecting apparatus includes a fixed first plate and a rotational second plate which are arranged to face each other and are respectively made of an electrically insulating material. Provided on the first plate are a plurality of electrodes arranged circumferentially and forming a pair of sets of input rotational angle detection electrodes and a pair of sets of input reference angular position detection electrodes and at least two capacitive coupling signal transmitting electrically conductive rings. Also provided on the second plate are at least one set of output rotational angle detection electrodes and at least one set of output reference angular position detection electrodes arranged to face the respective pairs of sets of electrodes on the first plate and at least two capacitive coupling signal transmitting electrically conductive rings which are respectively connected to the at least two sets of electrodes on the second plate and respectively arranged to face the at least two rings on the first plate. The capacity type rotation detecting apparatus further includes first and second periodic signal supply circuits which have different repetition periods and respectively supply detecting signals of opposite phase to the respective pairs of sets of input electrodes on the first plate, and a rotational angle signal generating circuit and a reference angular position signal generating circuit responsive to respective signals generated at the at least two rings on the first plate to generate a rotational angle detection signal and a reference angular position detection signal, respectively, thereby simultaneously providing detection signals accurately without any delay irrespective of the rotational speeds of the second plate.
REFERENCES:
patent: 3760392 (1973-09-01), Stich
patent: 3873916 (1975-03-01), Sterki
patent: 3938113 (1976-02-01), Dobson
patent: 3961318 (1976-06-01), Farrand
patent: 4092579 (1978-05-01), Weit
patent: 4199800 (1980-04-01), Weit
Akita Shigeyuki
Tanaka Hiroaki
Groody James J.
Nippon Soken Inc.
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