TOUCH PANEL

• US 20100156826A1
• Filed: 05/22/2008
• Published: 06/24/2010
• Est. Priority Date: 05/24/2007
• Status: Active Grant

• Current Assignee: Gunze Limited
• Original Assignee: Gunze Limited
• Inventors: Yamada, Tsutomu, Hosoe, Masahiro, Itaya, Hisao
• Granted Patent: US 8,902,190 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04113 Peripheral electrode pattern in resistive digitisers, i.e. electrodes at the periphery of the resistive sheet are shaped in patterns enhancing linearity of induced field
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

In a touch panel, a rectangular resistive film is formed on a substrate and electrodes are provided along the four sides of the resistive film. Each electrode includes a plurality of gaps and a plurality of divided electrodes. The divided electrodes are linearly arranged along the corresponding side of the resistive film, and the electrode, in which the divided electrodes at both ends are connected to terminals, respectively, is formed by arranging the divided electrodes of the same shape and repeating this same shape.

Claims

1. A touch panel comprising:

two substrates opposing each other at a particular distance;

resistive films formed on opposing surfaces of the substrates, respectively; and

electrodes formed along four sides of one of the resistive films,

wherein each of the electrodes includes a plurality of divided electrodes that are linearly arranged and resistances between the divided electrodes, the divided electrodes and the resistances being connected in series with each other, and

lengths of portions, for applying voltage to the resistive film, of all the divided electrodes other than the divided electrodes at both ends are substantially the same, and a ratio of the length of each of the divided electrodes at both ends to the length of each of the other divided electrodes is from 0.1;

1 to 0.5;

1.

2. The touch panel according to claim 1, wherein adjacent divided electrodes among the divided electrodes oppose each other with a gap therebetween, and a resistance value of a resistance between the adjacent divided electrodes is determined based on the shape of the gap and a sheet resistance of the resistive film, and the resistance values of all the resistances are substantially the same by making substantially the same, gap widths and opposing lengths of all areas across which the divided electrodes oppose each other.

3. The touch panel according to claim 2, wherein a portion of the resistive film is removed to form an insulating portion in the gap.