Touch panel

• US 8,902,190 B2
• Filed: 05/22/2008
• Issued: 12/02/2014
• Est. Priority Date: 05/24/2007
• Status: Active Grant

• Current Assignee: Gunze Limited
• Original Assignee: Gunze Limited
• Inventors: Itaya, Hisao, Yamada, Tsutomu, Hosoe, Masahiro
• Primary Examiner(s): Lefkowitz, Sumati
• Assistant Examiner(s): SOTO LOPEZ, JOSE R
• Application Number:
  US12/601,157
• Publication Number:
  US 20100156826A1
• Time in Patent Office: 2,385 Days
• Field of Search: 345/173, 345/174
• US Class Current: 345/174
• 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,

each of the electrodes including 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, each of the divided electrodes being made pectinate and comprising a straight-shaped inner electrode portion and an outer electrode portion other than the straight-shaped inner electrode portion, configured such that

the straight-shaped inner electrode portion is disposed at a first distance from a respective one of the four sides of the one of the resistive films, the first distance being greater than a second distance at which the outer electrode portion is disposed from the respective one of the four sides,

the straight-shaped inner electrode portions of the divided electrodes each extend parallel to the respective one of the four sides and are linearly arranged with respect to each other,

lengths of the straight-shaped inner electrode portion in each of the divided electrodes other than the straight-shaped inner electrode portions of the divided electrodes at both ends of the electrode are substantially the same,

a ratio of the length of each of the straight-shaped inner electrode portions of the divided electrodes at the both ends of the electrode to the length of each of the straight-shaped inner electrode portions of the other divided electrodes is from 0.1;

1 to 0.5;

1, and

the straight-shaped inner electrode portions of the divided electrodes at the both ends of the electrode are connected to respective power supply terminals.

2. The touch panel according to claim 1, wherein

adjacent divided electrodes among the divided electrodes oppose each other with a gap therebetween, 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 one of the resistive films between an opposed portion of the straight-shaped inner electrode portion and the outer electrode portion is removed to form an insulating region in the gap, and equipotential lines formed by voltage applied to the resistive film from the straight shaped inner electrode portion are adjusted to be evenly arranged.

4. 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,

each of the electrodes including 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, each of the divided electrodes comprising a straight-shaped inner electrode portion and an outer electrode portion other than the straight-shaped inner electrode portion, configured such that

the straight-shaped inner electrode portion is disposed at a first distance from a respective one of the four sides of the one of the resistive films, the first distance being greater than a second distance at which the outer electrode portion is disposed from the respective one of the four sides,

lengths of the straight-shaped inner electrode portion in each of the divided electrodes other than the straight-shaped inner electrode portions of the divided electrodes at both ends of the electrode are substantially the same,

a ratio of the length of each of the straight-shaped inner electrode portions of the divided electrodes at the both ends of the electrode to the length of each of the straight-shaped inner electrode portions of the other divided electrodes is from 0.1;

1 to 0.5;

1, and

the straight-shaped inner electrode portions of the divided electrodes at the both ends of the electrode are connected to respective power supply terminals.