Manufacturing method of coordinate position detecting device

• US 8,269,742 B2
• Filed: 04/08/2009
• Issued: 09/18/2012
• Est. Priority Date: 05/19/2008
• Status: Active Grant

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Kondoh, Koichi
• Primary Examiner(s): Kumar, Srilakshmi K
• Application Number:
  US12/420,203
• Publication Number:
  US 20090284493A1
• Time in Patent Office: 1,259 Days
• Field of Search: 345173-175, 216/65, 216/83, 216/94
• US Class Current: 345/174
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A manufacturing method of a coordinate position detecting device includes the steps of forming the common electrode on the resistive film of tour sides of the substrate having a rectangular-shaped configuration; measuring the electric potential of the resistive film by plural probes contacting a surface of the resistive film where the electric potential is supplied from the common electrode to the resistive film; calculating a resistive film removing area, based on a value of a measured electric potential, by a calculating part so that the electric potential distribution of the resistive film is made uniform; and removing the resistive film in the resistive film removing area calculated by the calculating part, by a laser light.

Claims

1. A manufacturing method of a coordinate position detecting device, the coordinate position detecting device including a resistive film formed on a substrate having a rectangular-shaped configuration, and a common electrode configured to apply a voltage to the resistive film, wherein an electric potential distribution is generated on the resistive film by supplying an electric potential from the common electrode to the resistive film and detecting an electric potential of a position where the resistive film is contacted, so that a contact position coordinate of the resistive film is detected, the manufacturing method comprising:

forming the common electrode on the resistive film of four sides of the substrate;

measuring the electric potential of the resistive film by plural probes contacting a surface of the resistive film while supplying the electric potential from the common electrode to the resistive film;

calculating a resistive film removing area, based on a value of a measured electric potential, by a calculating part so that the electric potential distribution of the resistive film is made uniform; and

removing the resistive film in the resistive film removing area calculated by the calculating part, by a laser light.

2. The manufacturing method of the coordinate position detecting device as claimed in claim 1, further comprising:

driving a moving table, to which the substrate is fixed, by a control circuit based on information of the calculated resistive film removing area, the moving table being configured to move at least in a two-dimensional direction, and

irradiating the laser light to the fixed substrate while the moving table is driven.

3. The manufacturing method of the coordinate position detecting device as claimed in claim 1,

wherein the resistive film includes ITO or indium oxide, tin oxide, zinc oxide, or antimony oxide.

4. The manufacturing method of the coordinate position detecting device as claimed in claim 1,

wherein the substrate and the resistive film are transparent in a visible area.

5. The manufacturing method of the coordinate position detecting device as claimed in claim 1,

wherein the laser light has a wavelength of 340 nm through 420 nm.