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An incremental encoder rotational position detecting apparatus for detecting the incremental rotational position of a rotating member includes a rotatable disk plate rotated with the rotating member, a stationary disk plate opposite to the rotatable plate, and a detector circuit for supplying a rect

An incremental encoder rotational position detecting apparatus for detecting the incremental rotational position of a rotating member includes a rotatable disk plate rotated with the rotating member, a stationary disk plate opposite to the rotatable plate, and a detector circuit for supplying a rectangular signal to the stationary plate. The stationary plate has first, second, third and fourth electrodes and an earth electrode grounded. The earth electrode is arranged between the first electrode and the third electrode to reduce a distribution capacitance produced between the first and third electrodes. The rectangular signals with opposite phase to each other are applied between the first and second electrodes or the third and fourth electrodes of the stationary plate.

대표청구항 ▼

An incremental rotational position detector of electrostatic capacitance type comprising: a first plate including a first electrode having a plurality of electrode pieces arranged radially at equal spatial intervals to each other, a second electrode having a plurality of electrode pieces arranged ra

An incremental rotational position detector of electrostatic capacitance type comprising: a first plate including a first electrode having a plurality of electrode pieces arranged radially at equal spatial intervals to each other, a second electrode having a plurality of electrode pieces arranged radially between said electrode pieces of said first electrode, annular third and fourth electrodes, and an annular earth electrode arranged between said first and third electrodes and set to the earth potential; a second plate including 5th, 6th, 7th and 8th electrodes arranged in opposed relation to said first, second, third and fourth electrodes of said first plate respectively, said 5th electrode and said 7th electrode of said second plate being electrically connected to each other, said 6th electrode and said 8th electrode of said second plate being electrically connected to each other; and a detector circuit for supplying signals of opposite phases to selected one of the pair of said first and second electrodes of said first plate and the pair of said third and fourth electrodes thereof, so that the change of the electrostatic capacitance generated between the electrodes of said plates when said second plate is rotated in relation with said first plate is detected thereby to detect an incremental rotational position of said second plate.