US 10,768,021 B2 · Position detection device and position detection method

Abstract

A position detection device includes a fixed element, a movable element, a plurality of first electrodes, a second electrode, a third electrode and a first detection circuit. The movable element is movable relative to the fixed element. The first electrodes are arranged on either the fixed element or the movable element, and the second electrode is on the other of the movable element or the fixed element. The first electrodes include two or more phases with electrical signals having mutually different phases. The third electrode is provided on the fixed element and opposing the electrode that is on the movable element while the movable element is in a prescribed position. The first detection circuit detects when the movable element is in the prescribed position based on electrical signals generated in the second and third electrodes in accordance with the electrical signals supplied to the first electrodes.

Claims17

Dependent claims

A position detection device comprising:

a fixed element;
a movable element movably arranged relative to the fixed element;
a plurality of first electrodes arranged one-dimensionally on either the fixed element or the movable element in a plane along a movement direction of the movable element, the first electrodes including two or more phases to which are respectively supplied with electrical signals having mutually different phases;
a second electrode provided on the other one of the movable element or the fixed element to be at least partially opposed to the first electrodes;
a third electrode provided on the fixed element and opposing one of the first and second electrodes that is on the movable element while the movable element is in a prescribed position;
and
a first detection circuit configured to detect that the movable element is in the prescribed position based on an intensity of an electrical signal that is generated in the third electrode and a phase of an electrical signal that is generated in the second electrode in accordance with the electrical signals supplied to the first electrodes.

4 more elements

A position detection device comprising:

a fixed element;
a movable element movably arranged relative to the fixed element;
a plurality of first electrodes arranged on one-dimensionally either the fixed element or the movable element in a plane along a movement direction of the movable element, the first electrodes including two or more phases, to which are respectively supplied with electrical signals having mutually different phases;
a second electrode provided on the other one of the movable element or the fixed element to be at least partially opposed to the first electrodes, and the second electrode being arranged to be at least partially generate an electrical signal by the electrical signals being supplied to at least a part of the first electrodes;
a third electrode provided on the fixed element, the third electrode being arranged to be at least partially generate an electrical signal with an intensity corresponding to a distance from one of the first and second electrodes that is provided on the movable element by the electrical signals that are generated in the first and second electrodes that is provided on the movable element;
and
a first detection circuit configured to detect that the movable element is in a prescribed position based on an intensity of the electrical signal that is generated in the third electrode and a phase of the electrical signal that is generated in the second electrode in accordance with the electrical signals supplied to the first electrodes.

4 more elements

A position detection method for detecting a relative position of a movable element relative to a fixed element on which the movable element moves, in which a plurality of first electrodes are arranged one-dimensionally on either the fixed element or the movable element in a plane along a movement direction of the movable element, the first electrodes including two or more phases to which are respectively supplied with electrical signals having mutually different phases to which are respectively supplied with electrical signals having mutually different phases;

a second electrode is provided on the other one of the movable element or the fixed element to be at least partially opposed to the first electrodes;
and a third electrode is provided on the fixed element and opposing one of the first and second electrodes that is on the movable element while the movable element is in a prescribed position the position detection method comprising:
detecting that the movable element is in a prescribed position based on an intensity of an electrical signal that is generated in the third electrode and a phase of an electrical signal that is generated in the second electrode in accordance with the electrical signals supplied to the first electrodes.

Dependencies are inferred from the claim text.

Position detection device and position detection method

Life of this patent

Position detection device and position detection method

Life of this patent

Abstract

Claims17