Film sensor

• US 9,140,736 B2
• Filed: 11/15/2012
• Issued: 09/22/2015
• Est. Priority Date: 11/16/2011
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Ishibashi, Kuniaki, Sugino, Akiko, Chiba, Tsuyoshi, Fujita, Masakuni, Yamaoka, Takashi
• Primary Examiner(s): NGUYEN, HOAI AN D
• Application Number:
  US13/677,754
• Publication Number:
  US 20130120006A1
• Time in Patent Office: 1,041 Days
• Field of Search: 324/686, 324/658, 324/649, 324/600, 324/519, 324/548, 324/661, 702/47, 702/52, 361/271, 361/306.3, 361/502, 361/562, 345/174, 345/173
• US Class Current: 1/1
• CPC Class Codes: G01D 5/24 by varying capacitance
• CPC Class Codes: G01R 27/2605 Measuring capacitance capacitive sensors G01D5/24
• CPC Class Codes: G01R 31/312 by capacitive methods
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A film sensor includes a polarizing film, an antistatic layer and a capacitive sensor that are laminated in this order, the capacitive sensor having a transparent film, a transparent electrode pattern formed on one side of the transparent film, and an adhesive layer formed on the one side of the transparent film to embed the transparent electrode pattern. The transparent film is disposed between the antistatic layer and the transparent electrode pattern. The antistatic layer has a surface resistance value of 1.0×10⁹ to 1.0×10¹¹Ω/□.

Claims

1. A film sensor comprising:

a polarizing film, an antistatic layer and a capacitive sensor that are laminated in this order,

the capacitive sensor having a transparent film, a transparent electrode pattern formed at one side of the transparent film, and an adhesive layer formed at the one side of the transparent film to embed the transparent electrode pattern,

the transparent film being disposed between the antistatic layer and the transparent electrode pattern,

the antistatic layer having a surface resistance value of 1.0×

10⁹ to 1.0×

10¹¹Ω

/□

.

2. The film sensor according to claim 1, wherein the antistatic layer and the adhesive layer are disposed at a predetermined interval with the transparent film being interposed between the antistatic layer and the adhesive layer.

3. The film sensor according to claim 1, wherein, after the adhesive layer has been formed at the one side of the transparent film, the antistatic layer is formed at the other side of the transparent film.

4. The film sensor according to claim 1, wherein the antistatic layer includes any one of a surface active agent, an alkaline metal salt, a polyhydric alcohol, a conductive fine particle and a conductive polymer.

5. The film sensor according to claim 4, wherein the alkaline metal salt is bis(trifluoroalkanesulfonyl)imide alkaline metal salt.