Patent ID: 8829368

Claim:
A resistive film type input device comprising: a first insulating substrate disposed on a side adjacent to a liquid crystal display unit; a second insulating substrate which is disposed opposite the first insulating substrate with a gap interposed therebetween, the second insulating substrate disposed on a side of an input operation of the input device; a planar resistive film which is formed on a surface of the first insulating substrate opposed to the second insulating substrate in an X direction and a Y direction intersecting the X direction on the surface of the first insulating substrate; feeding electrodes which apply a voltage to both end portions of the resistive film on the first insulating substrate, the feeding electrodes include a first feeding electrode which applies a voltage to both end portions in the X direction of the planar resistive film and a second feeding electrode which applies a voltage to both end portions in the Y direction of the planar resistive film at time different from that of the first feeding electrode; a plurality of detecting electrode films each having a right triangular plane shape and formed on a surface of the second insulating substrate opposed to the first insulating substrate in a manner not to contact the planar resistive film when the second insulating substrate is not pressed down, the plurality of detecting electrode films being arranged such that a plurality of pairs of the detecting electrode films are arranged in the X direction or in the Y direction with hypotenuses thereof adjacent to each other and each of the extended hypotenuses intersects both the X direction and the Y direction of the second insulating substrate, the plurality of detecting electrode films being electrically separated from each other: and a potential detecting unit for detecting potentials of the plurality of detecting electrode films respectively in a first period when the first feeding electrode applies a voltage to both end portions in the X direction of the planar resistive film, and in a second period when the second feeding electrode applies a voltage to both end portions in the Y direction of the planar resistive film, wherein the potential detecting unit is configured to upon the first period, detect a potential of a contact location of the planar resistive film through the detecting electrode film contacted to the planar resistive film among the plurality of detecting electrode films to specify a location in the X direction of the contact location, and upon the second period, detect a potential of a contact location of the planar resistive film through the detecting electrode film contacted to the planar resistive film among the plurality of detecting electrode films to specify a location in the Y direction of the contact location.