Conductive sheet for touch panel and capacitive touch panel

Patent metadata

Field	Value
Publication number	US-10055076-B2
Application number	US-201615271371-A
Country	US
Kind code	B2
Filing date	Sep 21, 2016
Priority date	May 16, 2014
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

In a second-conductive-sheet for a touch-panel, a plurality of upper-detection-electrodes disposed in a detection region and a plurality of second terminal wiring portions disposed in a peripheral wiring region to electrically connect the upper-detection-electrodes to second terminal portions and are formed. Each of the upper-detection-electrodes is made of a mesh-patterned first metal mesh having intersecting thin conductive metal wires, and each of the second terminal wiring portions is made of a mesh-patterned second metal mesh having intersecting thin conductive metal wires made of the same material as the thin conductive metal wires constituting each of the upper detection electrodes. The wire width of the first metal mesh is set to be equal to or less than 5 μm, and the extension direction of the thin conductive metal wires constituting the first metal mesh and the second metal mesh is inclined with respect to a bending line direction of a bent portion of a second-resin-film.

First claim

What is claimed is:

1. A conductive sheet for a touch panel comprising:
a resin film on which a plurality of detection electrodes disposed in a detection region and a plurality of peripheral wirings disposed in a peripheral wiring region to electrically connect the detection electrodes to terminal portions are formed, the resin film having a three-dimensional shape having a bent portion,
wherein each of the detection electrodes is made of a mesh-patterned first metal mesh having intersecting thin conductive metal wires,
each of the peripheral wirings is made of a mesh-patterned second metal mesh having intersecting thin conductive metal wires made of the same material as the thin conductive metal wires constituting each of the detection electrodes, and
the wire width of the first metal mesh is equal to or less than 5 μm, and the extension direction of the thin conductive metal wires constituting the first metal mesh and the second metal mesh is inclined at an angle of 20° to 70° with respect to a bending line direction of the bent portion of the resin film.

2. The conductive sheet for a touch panel according to claim 1 ,
wherein the resin film has the bent portion in a region including at least one of the detection electrode or the peripheral wirings.

3. The conductive sheet for a touch panel according to claim 1 ,
wherein an average mesh pitch of the second metal mesh is smaller than an average mesh pitch of the first metal mesh.

4. The conductive sheet for a touch panel according to claim 2 ,
wherein an average mesh pitch of the second metal mesh is smaller than an average mesh pitch of the first metal mesh.

5. The conductive sheet for a touch panel according to claim 3 ,
wherein the average mesh pitch of the second metal mesh is 10 to 50 μm.

6. The conductive sheet for a touch panel according to claim 4 ,
wherein the average mesh pitch of the second metal mesh is 10 to 50 μm.

7. The conductive sheet for a touch panel according to claim 1 ,
wherein the wire width of the first metal mesh is equal to the wire width of the second metal mesh.

8. The conductive sheet for a touch panel according to claim 2 ,
wherein the wire width of the first metal mesh is equal to the wire width of the second metal mesh.

9. The conductive sheet for a touch panel according to claim 3 ,
wherein the wire width of the first metal mesh is equal to the wire width of the second metal mesh.

10. The conductive sheet for a touch panel according to claim 4 ,
wherein the wire width of the first metal mesh is equal to the wire width of the second metal mesh.

11. The conductive sheet for a touch panel according to claim 1 ,
wherein a first stress distribution portion which is insulated from both of the detection electrodes and the peripheral wirings and has the same surface density as that of the first metal mesh is provided between at least adjacent detection electrodes in the detection region.

12. The conductive sheet for a touch panel according to claim 11 ,
wherein the first stress distribution portion has intersecting thin conductive metal wires made of the same material as the thin conductive metal wires constituting each of the detection electrodes, and is made of a metal mesh having the same mesh shape as that of the first metal mesh.

13. The conductive sheet for a touch panel according to claim 11 ,
wherein a second stress distribution portion which is insulated from both the detection electrodes and the peripheral wirings and has the same surface density as that of the second metal mesh is provided between at least adjacent peripheral wirings in the peripheral wiring region.

14. The conductive sheet for a touch panel according to claim 13 ,
wherein the second stress distribution portion has intersecting thin conductive metal wires made of the same material as the thin conductive metal wires constituting each of the peripheral wirings, and is made of a metal mesh having the same mesh shape as that of the second metal mesh.

15. The conductive sheet for a touch panel according to claim 1 ,
wherein a stress relaxation portion in which the thin conductive metal wires constituting each of the detection electrodes are disconnected is formed inside at least one of the detection electrodes.

16. The conductive sheet for a touch panel according to claim 15 ,
wherein the stress relaxation portion is formed by partially disconnecting the thin conductive metal wires constituting each of the detection electrodes.

17. The conductive sheet for a touch panel according to claim 1 ,
wherein the shape of the first metal mesh is a random pattern.

18. The conductive sheet for a touch panel according to claim 1 ,
wherein the shape of the second metal mesh is a regular pattern.

19. The conductive sheet for a touch panel according to claim 1 ,
wherein the resin film is bent with a surface, on which the detection electrodes and the peripheral wirings are formed, placed inside to have a three-dimensional shape.

20. A capacitive touch panel comprising:
the conductive sheet for touch panel according to claim 1 .

Assignees

• Fujifilm Corp

Inventors

• Nakayama Masaya

Classifications

• G06F2203/04112

  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 title

• G06F2203/04111

  Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F3/0445

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · CPC title