Touch panel and an input device equipped therewith

• US 20030030626A1
• Filed: 05/31/2002
• Published: 02/13/2003
• Est. Priority Date: 08/08/2001
• Status: Active Grant

• Current Assignee: Nagano Fujitsu Component Limited
• Original Assignee: Nagano Fujitsu Component Limited
• Inventors: Furukawa, Shozo, Matsuda, Genichi
• Granted Patent: US 7,071,925 B2
• Time in Patent Office: Days
• 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 touch panel that includes a polarizing plate, and used as an input device of a display unit of a personal computer, a word processor, an electronic notebook and the like is structured by one or more films that have a low heat contraction coefficient and a low water absorption coefficient, which remarkably suppress occurrence of concave deformations of the polarizing plate after exposure to a high temperature and soaking in water, avoiding short circuits.

Claims

1. A touch panel, having a polarizing plate on an upper surface of a main part of the touch panel, comprising a film pasted on an upper surface of the polarizing plate, the film having a heat contraction rate smaller than 0.3% after being exposed to a temperature of 100 degrees C. for 30 minutes, and a water absorption rate smaller than 0.5% after having been soaked in 23-degree C. water for 24 hours.

2. The touch panel as claimed in claim 1, wherein the film is made from one of:

polyethylene naphthalate,

polynorbornen,

polycycloolefin,

polycarbonate,

polyethersulphone, and

polyarylate.

7. An input device, comprising a touch panel as claimed in claim 1, the touch panel being on a surface of a display unit.

8. An input device, comprising a touch panel as claimed in claim 2, the touch panel being on a surface of a display unit.

3. A touch panel, having a polarizing plate on an upper surface of a main part of the touch panel, the polarizing plate comprising two films and a polarizing film, wherein the two films sandwich the polarizing film, each of the films that sandwich the polarizing film having a heat contraction rate smaller than 0.3% after being exposed to a temperature of 100 degrees C. for 30 minutes, and a water absorption rate smaller than 0.5% after having been soaked in 23-degree C. water for 24 hours.

4. The touch panel as claimed in claim 3, wherein each of the films that sandwich the polarizing film is made from one of:

polyethylene naphthalate,

polynorbornen,

polycycloolefin,

polycarbonate,

polyethersulphone, and

polyarylate.

9. An input device, comprising a touch panel as claimed in claim 3, the touch panel being on a surface of a display unit.

10. An input device, comprising a touch panel as claimed in claim 4, the touch panel being on a surface of a display unit.

5. A touch panel, having a polarizing plate on an upper surface of a main part of the touch panel, comprising a film of fluororesin on an upper surface of the polarizing plate.

11. An input device, comprising a touch panel as claimed in claim 5, the touch panel being on a surface of a display unit.

6. A touch panel comprising:

a main part that further comprises;

a glass substrate, on an upper surface of which a transparent resistance film is formed, and

a λ

/4 phase-difference film, on a lower surface of which a transparent resistance film is formed, which is pasted on the upper surface of the glass substrate, functioning as an upper surface film of the main part of the touch panel,

a polarizing plate that is pasted on the upper surface of the main part of the touch panel, and

a film that is pasted on an upper surface of the polarizing plate, made from one of

polyethylene naphthalate,

polynorbornen,

polycycloolefin,

polycarbonate,

polyethersulphone, and

polyarylate.

12. An input device, comprising a touch panel as claimed in claim 6, the touch panel being on a surface of a display unit.