Electroconductive sheet and touch panel

• US 9,078,364 B2
• Filed: 05/07/2014
• Issued: 07/07/2015
• Est. Priority Date: 12/16/2011
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Nakamura, Hiroshige
• Primary Examiner(s): Thompson, Timothy
• Assistant Examiner(s): McAllister, Michael F
• Application Number:
  US14/271,512
• Publication Number:
  US 20140238730A1
• Time in Patent Office: 426 Days
• Field of Search: 174/253, 345/173, 200/600
• US Class Current: 1/1
• CPC Class Codes: B32B 15/14 next to a fibrous or filamentary layer
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: H05K 1/0274 Optical details, e.g. printed circuits comprising integral optical means H05K1/0269 takes precedence; coupling light guides with opto-electronic components G02B6/42
• CPC Class Codes: H05K 1/0296 Conductive pattern lay-out details not covered by sub groups H05K1/02 - H05K1/0295 H05K1/11 takes precedence; lay-out adapted to mounted component configuration H05K1/18
• CPC Class Codes: H05K 2201/09245 Crossing layout alternating conductors H05K2201/097

Abstract

The present invention provides an electroconductive sheet and a touch panel which do not impair visibility in a vicinity of an electrode terminal in a sensing region. In an electroconductive sheet which has an electrode pattern constructed of a metal thin wire and an electrode terminal that is electrically connected to an end of the electrode pattern, a transmittance of the electrode pattern is 83% or more, and when the transmittance of the electrode pattern is represented by a %, a transmittance of the electrode terminal is controlled to be (a-20)% or more and (a-3)% or less.

Claims

1. An electroconductive sheet comprising:

an electrode pattern constructed of a metal thin wire; and

an electrode terminal that is electrically connected to an end of the electrode pattern, wherein

a transmittance of the electrode pattern is 83% or more, and when the transmittance of the electrode pattern is represented by a %, a transmittance of the electrode terminal is (a-20)% or more and (a-3)% or less.

3. The electroconductive sheet according to claim 1, wherein the electrode terminal includes a mesh shape formed of lattices constructed of a metal thin wire.

4. The electroconductive sheet according to claim 3, wherein the metal thin wire has a line width of 30 μ

m or less.

5. The electroconductive sheet according to claim 3, wherein the metal thin wire is made from an opaque material.

2. An electroconductive sheet comprising:

an electrode pattern constructed of a metal thin wire; and

an electrode terminal that is electrically connected to an end of the electrode pattern, wherein

an aperture ratio of the electrode pattern is 90% or more, and when the aperture ratio of the electrode pattern is represented by b %, an aperture ratio of the electrode terminal is (b-20)% or more and (b-0.1)% or less.

6. An electroconductive sheet comprising:

an electrode pattern constructed of a metal thin wire; and

an electrode terminal that is electrically connected to an end of the electrode pattern, wherein

the electrode terminal includes a frame shape constructed of a metal thin wire.

7. The electroconductive sheet according to claim 6, wherein

when a line width of the thin wire of the electrode pattern is represented by a (μ

m), a line width b (μ

m) of the frame shape of the electrode terminal satisfies b≧

2a or b≧

a+5 (μ

m).

8. The electroconductive sheet according to claim 7, wherein the line width a (μ

m) of the thin wire of the electrode pattern is 30 μ

m or less.

9. The electroconductive sheet according to claim 7, further comprising

a mesh shape provided in the frame shape of the electrode terminal constructed of the metal thin wire, the mesh shape which is formed of lattices constructed of a metal thin wire.