Patent ID: 8711089
Filing Date: 2014-04-29
Classification: G06F

Abstract:
1. A position detection device, comprising: an electromagnetic conversion element arranged on a given plane and having a first side and a second side; a rectangular magnetic field generator having a face opposing the first side of the electromagnetic conversion element for generating a magnetic field covering the electromagnetic conversion element, wherein the rectangular magnetic field generator has a first end and a second end, and a thickness of the rectangular magnetic field generator decreases from the second end to the first end, and a first yoke that is arranged in parallel with the given plane, separated from the rectangular magnetic field generator by an air gap space, having a face opposing the second side of the electromagnetic conversion element, and having a first end and a second end that correspond, respectively, to the first and second ends of the rectangular magnetic field generator, wherein the first yoke is not connected to the rectangular magnetic field generator, wherein the first side of the electromagnetic conversion element directly faces the face of the magnetic field generator with only the air gap space therebetween, and the second side of the electromagnetic conversion element directly faces the face of the yoke with only the air gap space therebetween, wherein the electromagnetic conversion element moves, relative to the opposed face of the rectangular magnetic field generator, straight in the given plane between the first ends and the second ends of the rectangular magnetic field generator and the first yoke without contacting the first yoke or the magnetic field generator, wherein a relative position between the electromagnetic conversion element and the magnetic field generator is detected, when there is a relative displacement between the electromagnetic conversion element and the rectangular magnetic field generator, based on an output signal of the electromagnetic conversion element, and wherein a distance between the face of the rectangular magnetic field generator and the electromagnetic conversion element becomes largest when the electromagnetic conversion element is at the first end of the rectangular magnetic field generator, and becomes smallest when the electromagnetic conversion element is at the second end of the rectangular magnetic field generator.