Transparent touch panel with contractible resin layer used to maintain visibility

• US 5,668,576 A
• Filed: 10/24/1995
• Issued: 09/16/1997
• Est. Priority Date: 04/28/1993
• Status: Expired due to Term

• Current Assignee: Nissha Printing Company Limited
• Original Assignee: Nissha Printing Company Limited
• Inventors: Ikura, Kenichirou, Nishikawa, Kazuhiro
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): Bell, Paul A.
• Application Number:
  US08/537,816
• Time in Patent Office: 693 Days
• Field of Search: 345/173, 345/174, 178/18, 178/19
• US Class Current: 345/173
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A transparent touch panel includes a movable electrode film which is transparent and flexible, a hard coating layer which is transparent and formed on an upper surface of the movable electrode film, a movable electrode which is transparent and formed over a lower surface of the movable electrode film, a contractible resin layer which is transparent and formed between the movable electrode film and the movable electrode in correspondence to the hard coating layer, a fixed electrode-supporting member disposed in opposition to the lower surface of the movable electrode film, a fixed electrode formed on an upper surface of the fixed electrode-supporting member opposed to the lower surface of the movable electrode film, and spacers formed between the lower surface of the movable electrode film where the movable electrode is formed and the upper surface of the fixed electrode-supporting member where the fixed electrode is formed.

Claims

1. A transparent touch panel comprising:

a movable electrode film transparent and flexible;

a hard coating layer transparent and formed on an upper surface of the movable electrode film;

a movable electrode transparent and formed over a lower surface of the movable electrode film;

a contractible resin layer transparent and formed between the movable electrode film and the movable electrode;

a fixed electrode-supporting member disposed in opposition to the lower surface of the movable electrode film;

a fixed electrode formed on an upper surface of the fixed electrode-supporting member opposed to the lower surface of the movable electrode film; and

spacers formed between the lower surface of the movable electrode film where the movable electrode is formed and the upper surface of the fixed electrode-supporting member where the fixed electrode is formed.

2. The transparent touch panel as claimed in claim 1, further comprising a supporting frame provided between the contractible resin layer and the movable electrode.

3. The transparent touch panel as claimed in claim 1, wherein a thickness of the movable electrode film is 100-200 μ

m, a thickness of the hard coating layer is 1-15 μ

m, and a thickness of the contractible resin layer is 0.5-3 times as large as that of the hard coating layer.

4. The transparent touch panel as claimed in claim 1, wherein a thermal contraction coefficient of the hard coating layer is almost equal to a total of a thermal contraction coefficient of the contractible resin layer and that of the movable electrode.

5. The transparent touch panel as claimed in claim 1, wherein a total of a thermal contraction coefficient of the contractible resin layer and that of the movable electrode is greater than that of the hard coating layer.

6. The transparent touch panel as claimed in claim 2, wherein a thermal contraction coefficient of the hard coating layer is almost equal to a total of a thermal contraction coefficient of the contractible resin layer, that of the supporting frame, and that of the movable electrode.

7. The transparent touch panel as claimed in claim 2, wherein a total of a thermal contraction coefficient of the contractible resin layer, that of the supporting frame, and that of the movable electrode is greater than that of the hard coating layer.

8. The transparent touch panel as claimed in claim 2, wherein the hard coating layer is made of acrylic resin;

the movable electrode film is made of polyester film;

the contractible resin layer is made of acrylic resin;

the supporting frame is made of polyethylene terephthalate;

an adhesive agent is made of acrylic resin;

the movable electrode is made of ITO;

the spacers are made of photosensitive acrylic resin;

the fixed electrode is made of ITO; and

the fixed electrode-supporting member is made of glass.