COORDINATE DETECTION APPARATUS

• US 20160085344A1
• Filed: 12/07/2015
• Published: 03/24/2016
• Est. Priority Date: 04/23/2008
• Status: Active Grant

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Kondoh, Koichi, Furukawa, Shozo, Sekizawa, Mitsuhiro, Nakajima, Takashi
• Granted Patent: US 9,778,809 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

In a coordinate detection apparatus, a resistance-film is formed on a substrate made of an insulating material. A common electrode applies a voltage to the resistance-film, the common electrode extending along a plurality of a resistance-film removal areas formed by removing portions of the resistance-film. A voltage application part applies the voltage to the common electrode. The voltage is applied from the voltage application part to the resistance-film through the common electrode to generate a potential distribution in the resistance-film. A coordinate position of a contact position at which the resistance-film is contacted is detected by detecting a potential of the resistance-film at the contact position.

Claims

1. A coordinate detection apparatus comprising:

a resistance-film formed on a substrate;

a plurality of resistance-film removal areas formed on a marginal area of the substrate, each of the resistance-film removal areas is formed by removing a portion of the resistance-film; and

a common electrode configured to apply a voltage to the resistance-film, the common electrode including potential supply parts each configured to apply the voltage to the resistance-film,

wherein each of the potential supply parts is provided at a position between adjacent resistance-film removal areas,

wherein the resistance-film removal areas are configured and arranged so that a uniform potential distribution is generated in the resistance-film when the voltage is applied to the resistance film, and

wherein each of the potential supply parts is formed so that a contact area between the common electrode and the resistance-film per unit length is gradually reduced from a middle portion of each side of the substrate toward each end of the side.

2. The coordinate detection apparatus as claimed in claim 1, further comprising:

a plurality of second resistance-film removal areas formed along the common electrode on an inner side of an area surrounded by the common electrode.

3. The coordinate detection apparatus as claimed in claim 1, wherein at least one of pitches of the resistance-film removal areas and intervals between adjacent resistance-film removal areas are equal to each other, respectively.

4. The coordinate detection apparatus as claimed in claim 1, wherein each of the resistance-film removal areas has the same shape.

5. A coordinate detection apparatus comprising:

a resistance-film formed on a substrate;

a plurality of resistance-film removal areas formed on a marginal area of the substrate, each of the resistance-film removal areas is formed by removing a portion of the resistance-film; and

a common electrode configured to apply a voltage to the resistance-film, the common electrode including potential supply parts each configured to apply the voltage to the resistance-film,

wherein each of the potential supply parts is provided at a position between adjacent resistance-film removal areas,

wherein the resistance-film removal areas are configured and arranged so that a uniform potential distribution is generated in the resistance-film when the voltage is applied to the resistance film, and

wherein each of the potential supply parts is formed so that a number of the potential supply parts per unit length is gradually reduced from a middle portion of each side of the substrate toward each end of the side.