CONDUCTIVE SHEET AND TOUCH PANEL

• US 20140299361A1
• Filed: 06/20/2014
• Published: 10/09/2014
• 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
• Granted Patent: US 9,877,385 B2
• Time in Patent Office: Days
• US Class Current: 174/253
• 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,

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

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

5%<

B/(A+B)<

97%

2. The conductive sheet according to claim 1, wherein the area A of each first conductive pattern and the area B of each sub-nonconduction pattern satisfy a following expression.

10%≦

B/(A+B)≦

80%

3. The conductive sheet according to claim 2, wherein the area A of each first conductive pattern and the area B of each sub-nonconduction pattern satisfy a following expression.

10%≦

B/(A+B)≦

60%

4. The conductive sheet according to claim 1, 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%

5. The conductive sheet according to claim 4, 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)

6. The conductive sheet according to claim 1, wherein

the first conductive pattern has X-shaped structures with cyclical intersections, and

an area A2 of the first conductive pattern and an area B2 of the sub-nonconduction pattern satisfy a following expression.

20%≦

B2/(A2+B2)≦

50%

7. The conductive sheet according to claim 1, wherein

the first conductive pattern has X-shaped structures with cyclical intersections, and

an area A2 of the first conductive pattern and an area B2 of the sub-nonconduction pattern satisfy a relation of a following expression.

30%≦

B2/(A2+B2)≦

50%

8. The conductive sheet according to claim 1, further comprising

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

the second electrode pattern is made of metal thin wires, and includes a plurality of second conductive patterns that extend in a second direction orthogonal to the first direction.

9. The conductive sheet according to claim 1, wherein

the plurality of first conductive patterns are formed by grids having uniform shapes, and

each of the grids has one side having a length that is equal to or more than 250 μ

m and equal to or less than 900 μ

m.

10. The conductive sheet according to claim 1, wherein each of the metal thin wires that form the first electrode pattern and/or the metal thin wires that form the second electrode pattern has a wire width equal to or less than 30 μ

m.

11. The conductive sheet according to claim 4, wherein a width of the first conductive pattern line and a width of the sub-nonconduction pattern are equal to each other.

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

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

14. The conductive sheet according to claim 11 wherein the first electrode pattern includes a joining part that electrically connects the plurality of first conductive pattern lines to each other.

15. The conductive sheet according to claim 4, wherein a number of the first conductive pattern lines is equal to or less than ten.

16. The conductive sheet according to claim 6, wherein

the sub-nonconduction pattern is surrounded by a plurality of sides, and

the sides are formed by linearly arranging a plurality of grids that form the first conductive pattern, with sides of the grids being connected to each other.

17. The conductive sheet according to claim 6, wherein

the sub-nonconduction pattern is surrounded by a plurality of sides, and

the sides are formed by linearly arranging, in multiple stages, a plurality of grids that form the first conductive pattern, with sides of the grids being connected to each other.

18. The conductive sheet according to claim 6, wherein

the sub-nonconduction pattern is surrounded by a plurality of sides,

some of the sides are formed by linearly arranging a plurality of grids that form the first conductive pattern, with sides of the grids being connected to each other, and

the other sides are formed by linearly arranging the plurality of grids with apex angles of the grids being connected to each other.

19. The conductive sheet according to claim 16, wherein a plurality of the sub-nonconduction patterns defined by the sides formed by the plurality of grids are arranged along the first direction with apex angles of the grids being connected to each other.

20. The conductive sheet according to claim 16, wherein adjacent ones of the sub-nonconduction patterns along the first direction have shapes different from each other.

21. The conductive sheet according to claim 16, wherein the plurality of grids that form the sides which define the sub-nonconduction pattern further includes a protruding wire made of a metal thin wire.

22. The conductive sheet according to claim 16, wherein the first conductive pattern includes the sub-nonconduction patterns at predetermined intervals, to thereby has X-shaped structures in which the grids are not present at cyclical intersection parts.

23. The conductive sheet according to claim 16, wherein

adjacent ones of the sub-nonconduction patterns along the first direction have same shape as each other in the first conductive pattern, and

the sub-nonconduction patterns have shapes different between adjacent ones of the first conductive patterns.

24. A touch panel comprising the conductive sheet according to claim 1.