Patent ID: 9337796
Filing Date: 2016-05-10
CPC Classification: H01G,H03H

Claim Text:
1. A capacitance device comprising: a dielectric layer; a first electrode that is formed in a predetermined first shape on a predetermined surface of the dielectric layer; a second electrode that is formed on an opposite surface of the dielectric layer opposite to the predetermined surface, has a first region overlapping a projection pattern obtained by projecting the first electrode onto the opposite surface, and is formed in a second shape such that an area of the first region does not change even when the first electrode undergoes relative displacement in a predetermined direction within the predetermined surface; a third electrode that is formed on the opposite surface of the dielectric layer opposite to the predetermined surface, has a second region overlapping the projection pattern obtained by projecting the first electrode onto the opposite surface, and is formed in a third shape such that an area of the second region does not change even when the first electrode undergoes relative displacement in a predetermined direction within the predetermined surface; a first external terminal that is provided on a first side surface of the dielectric layer, and is connected to the first electrode; a second external terminal that is provided on a second side surface of the dielectric layer opposing the first side surface, and is connected to the second electrode; and a third external terminal that is provided on the second side surface of the dielectric layer so as to be separated by a predetermined distance from the second external terminal, and is connected to the third electrode, wherein the first electrode has a first electrode portion including an electrode region corresponding to the first region and extending in a first direction within the predetermined surface and a first terminal portion for electrically externally connecting the first electrode portion, the second electrode has a second electrode portion including an electrode region corresponding to the first region and extending in a second direction crossing the first direction within the opposite surface and a second terminal portion for electrically externally connecting the second electrode portion, the first terminal portion and the second terminal portion are respectively formed wider than the first electrode portion and the second electrode portion, the first electrode portion and the second electrode portion are individually formed in such shapes that the area of the first region does not change even when the first electrode undergoes relative displacement with respect to the second electrode within the predetermined surface in a direction orthogonal to the predetermined direction, and the dielectric layer is formed of a ferroelectric material, and capacity changes depending on a control signal applied by an outside circuit.