Conductive sheet and touch panel

• US 9,370,095 B2
• Filed: 11/12/2013
• Issued: 06/14/2016
• Est. Priority Date: 05/13/2011
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Kuriki, Tadashi
• Primary Examiner(s): Leiby, Christopher E
• Application Number:
  US14/078,063
• Publication Number:
  US 20140076612A1
• Time in Patent Office: 945 Days
• Field of Search: 345173-174, 174/250
• US Class Current: 1/1
• 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 3/041 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 1/0298 Multilayer circuits

Abstract

In this conductive sheet and touch panel, a laminated conductive sheet is configured by laminating: a first conductive sheet having a first conductive pattern configured from a plurality of first sensor units; and a second conductive sheet having a second conductive pattern configured from a plurality of second sensor units. The first sensor units have: a band-shaped section extending in a direction approximately perpendicular to one direction; and a jutting section that juts from both sides of the band-shaped section in the one direction. The second sensor units are formed in a manner so as to approximately fill the regions demarcated by the band-shaped section and the jutting section.

Claims

1. A conductive sheet comprising a first conductive part and a second conductive part, stacked with a substrate interposed therebetween, wherein

the first conductive part contains two or more first conductive patterns arranged in one direction, the first conductive patterns being composed of thin metal wires,

the second conductive part contains two or more second conductive patterns arranged in another direction approximately perpendicular to the one direction, the second conductive patterns being composed of thin metal wires,

the first conductive patterns each contain two or more first sensing portions connected with each other, the first sensing portions being composed of thin metal wires,

the second conductive patterns each contain two or more second sensing portions connected with each other, the second sensing portions being composed of thin metal wires,

the first sensing portions and the second sensing portions each contain a plurality of small lattices arranged,

the first sensing portions each contain a strip composed of thin metal wires and protrusions composed of thin metal wires, wherein the strip and the protrusions are electrically connected,

the strip extends in the other direction approximately perpendicular to the one direction, and the protrusions extend from both sides of the strip in the one direction,

the strip and the protrusions both contain the plurality of small lattices arranged,

the second sensing portions each cover most of a region surrounded by the strip and the protrusions,

an occupation area of the second sensing portion is larger than an occupation area of the first sensing portion, and

as viewed from above, overlaps of the first conductive patterns and the second conductive patterns each contain a combination of a plurality of the small lattices.

2. The conductive sheet according to claim 1, wherein a width of the strip is smaller than a length of the strip.

3. The conductive sheet according to claim 1, wherein a length of the protrusion is at least ½

of a width of the strip.

4. The conductive sheet according to claim 1, wherein a width of the protrusion is at most ½

of a length of the protrusion.

5. The conductive sheet according to claim 1, wherein a length of the second sensing portion in the other direction perpendicular to the one direction is 0.5 to 2 times as large as a length of the second sensing portion in the one direction.

6. The conductive sheet according to claim 1, wherein the protrusions in two adjacent first sensing portions are arranged facing each other.

7. The conductive sheet according to claim 1, wherein

the small lattices have a side length of 30 to 500 μ

m, and

the thin metal wires have a line width of 15 μ

m or less.

8. The conductive sheet according to claim 1, wherein the substrate has a thickness of 50 to 350 μ

m.

9. A touch panel comprising a conductive sheet, which is used on a display panel, wherein

the conductive sheet contains a first conductive part and a second conductive part, stacked with a substrate interposed therebetween,

the first conductive part contains two or more first conductive patterns arranged in one direction, the first conductive patterns being composed of thin metal wires,

the second conductive part contains two or more second conductive patterns arranged in another direction approximately perpendicular to the one direction, the second conductive patterns being composed of thin metal wires,

the first conductive patterns each contain two or more first sensing portions connected with each other, the first sensing portions being composed of thin metal wires,

the second conductive patterns each contain two or more second sensing portions connected with each other, the second sensing portions being composed of thin metal wires,

the first sensing portions and the second sensing portions each contain a plurality of small lattices arranged,

the first sensing portions each contain a strip composed of thin metal wires and protrusions composed of thin metal wires, wherein the strip and the protrusions are electrically connected, the strip extends in the other direction approximately perpendicular to the one direction, and the protrusions extend from both sides of the strip in the one direction,

the strip and the protrusions both contain the plurality of small lattices arranged,

the second sensing portions each cover most of a region surrounded by the strip and the protrusions,

an occupation area of the second sensing portion is larger than an occupation area of the first sensing portion, and

as viewed from above, overlaps of the first conductive patterns and the second conductive patterns each contain a combination of a plurality of the small lattices.

10. The touch panel according to claim 9, wherein a width of the strip is smaller than a length of the strip.

11. The touch panel according to claim 9, wherein a length of the protrusion is at least ½

of a width of the strip.

12. The touch panel according to claim 9, wherein a width of the protrusion is at most ½

of a length of the protrusion.

13. The touch panel according to claim 9, wherein a length of the second sensing portion in the other direction perpendicular to the one direction is 0.5 to 2 times as large as a length of the second sensing portion in the one direction.

14. The touch panel according to claim 9, wherein the protrusions in the adjacent first sensing portions are arranged facing each other.

15. The touch panel according to claim 9, wherein

the small lattices have a side length of 30 to 500 μ

m, and

the thin metal wires have a line width of 15 μ

m or less.

16. The touch panel according to claim 9, wherein the substrate has a thickness of 50 to 350 μ

m.