Patent ID: 9594464
Date: 2017-03-14
CPC Classifications: G06F

Claim:
1. A capacitive touch panel that includes a plurality of detection electrodes insulated from each other and detects an input operation position of an input operation member on the basis of arrangement positions of the respective detection electrodes and capacitances between the respective detection electrodes and the input operation member, the capacitive touch panel comprising: an insulating support member that has an opening; a transparent input operation plate that is supported by the insulating support member to cover an aperture of the opening, and at least an input operation area of which above the opening is made of a see-through transparent member; the plurality of detection electrodes that are in contact with the transparent input operation plate and are arranged on the transparent input operation plate or the insulating support member around the opening so as to be insulated from each other; transmitting means for transmitting an alternating-current detection signal that changes relative potentials between the input operation member and the respective detection electrodes; a reference power supply circuit that includes a low-voltage reference power supply line and a high-voltage reference power supply line; an oscillation power supply circuit that includes a low-voltage oscillation power supply line connected to the low-voltage reference power supply line via a first coil and a high-voltage oscillation power supply line connected to the high-voltage reference power supply line via a second coil; signal detecting means for detecting a reception level of the alternating-current detection signal appearing on each of the detection electrodes via a capacitance between each of the detection electrodes and the input operation member; and input position detecting means for comparing relative distances between the input operation member and the arrangement positions of the respective detection electrodes on the basis of the reception levels of the alternating-current detection signal detected by the signal detecting means at the respective detection electrodes, and detecting the input operation position of the input operation member on the input operation area, wherein the respective detection electrodes are connected to one of the low-voltage oscillation power supply line and the high-voltage oscillation power supply line, and the transmitting means is connected to the low-voltage reference power supply line via a first capacitor and connected to the high-voltage reference power supply line via a second capacitor.