Conductive sheet and touch panel

• US 9,877,385 B2
• Filed: 06/20/2014
• Issued: 01/23/2018
• Est. Priority Date: 12/22/2011
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Nakamura, Hiroshige, Kuriki, Tadashi
• Primary Examiner(s): Willis, Tremesha S
• Application Number:
  US14/310,770
• Publication Number:
  US 20140299361A1
• Time in Patent Office: 1,313 Days
• Field of Search: 174253, 174250, 174251, 174255-258, 174261
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04112 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 3/0445 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 1/0289 having a matrix lay-out, i.e. having selectively interconnectable sets of X-conductors and Y-conductors in different planes
• 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 2201/0108 Transparent
• CPC Class Codes: H05K 2201/09681 Mesh conductors, e.g. as a ground plane
• CPC Class Codes: H05K 2201/09781 Dummy conductors, i.e. not used for normal transport of current; Dummy electrodes of components

Abstract

A conductive sheet includes: a substrate having a first main surface and a second main surface; and a first electrode pattern placed on the first main surface of the substrate. The first electrode pattern is made of metal thin wires, and includes a plurality of first conductive patterns that extend in a first direction. Each first conductive pattern includes, at least, inside thereof, a sub-nonconduction pattern that is electrically separated from the first conductive pattern. An area A of each first conductive pattern and an area B of each sub-nonconduction patterns satisfy a relation of 5%<B/(A+B)<97%. Accordingly, a conductive sheet and a touch panel having a high detection accuracy can be provided.

Claims

1. A conductive sheet, comprising:

a substrate having a first main surface and a second main surface; and

a first electrode pattern placed on the first main surface of the substrate, wherein the first electrode pattern is made of metal thin wires, and alternately includes;

a plurality of first conductive patterns that extend in a first direction; and

a plurality of first nonconductive patterns that are electrically separated from the plurality of first conductive patterns, wherein the first conductive patterns are formed of grids made of the metal thin wires intersecting with each other, each grid including an opening region surrounded by metal thin wires, each of the first conductive patterns includes, at least, inside thereof, a sub-nonconduction pattern that is electrically separated from the first conductive pattern, and wherein each sub-nonconduction pattern has a slit-like shape extending in the first direction, each first conductive pattern includes a plurality of first conductive pattern lines divided by each sub-nonconduction pattern, and an area A1 of each first conductive pattern and an area B1 of each sub-nonconduction pattern satisfy a following expression;

40%<

B1/(A1+B1)<

60%.

2. The conductive sheet according to claim 1, wherein a total width Wa of widths of the first conductive pattern lines and a total width Wb of:

a total width of widths of the sub-nonconduction patterns; and

a width of the first nonconductive pattern satisfy relations of following expressions (1) and (2);

1.0 mm<

Wa<

5.0 mm 

 

(1)

1.5 mm<

Wb<

5.0 mm 

 

(2).

3. The conductive sheet according to claim 1, wherein a width of the first conductive pattern line and a width of the sub-nonconduction pattern are equal to each other.

4. The conductive sheet according to claim 1, wherein a width of the first conductive pattern line is smaller than a width of the sub-nonconduction pattern.

5. The conductive sheet according to claim 1, wherein a width of the first conductive pattern line is larger than a width of the sub-nonconduction pattern.

6. The conductive sheet according to claim 3 wherein the first electrode pattern includes a joining part that electrically connects the plurality of first conductive pattern lines to each other.

7. The conductive sheet according to claim 1, wherein a number of the first conductive pattern lines is equal to or less than ten.

8. A conductive sheet comprising:

a substrate having a first main surface and a second main surface; and

a first electrode pattern placed on the first main surface of the substrate, wherein

the first electrode pattern is made of metal thin wires, and alternately includes;

a plurality of first conductive patterns that extend in a first direction; and

a plurality of first nonconductive patterns that are electrically separated from the plurality of first conductive patterns,

wherein the first conductive patterns are formed of grids made of the metal thin wires intersecting with each other, each grid including an opening region surrounded by metal thin wires,

each of the first conductive patterns has one end electrically connected to a first electrode terminal,

each of the first conductive patterns includes, at least, inside thereof, a sub-nonconduction pattern that is formed of a dummy pattern made of metal thin wires including break parts and is electrically separated from the first conductive pattern, and

an area A of each first conductive pattern and an area B of each sub-nonconduction pattern satisfy a following expression;

10%≦

B/(A+B)≦

80%, wherein

each sub-nonconduction pattern has a slit-like shape extending in the first direction, and

each first conductive pattern includes a plurality of first conductive pattern lines divided by each sub-nonconduction pattern.