Conductive sheet and capacitive touch panel

• US 8,686,308 B2
• Filed: 05/19/2011
• Issued: 04/01/2014
• Est. Priority Date: 05/27/2010
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Kuriki, Tadashi
• Primary Examiner(s): Luebke, Renee
• Assistant Examiner(s): SAEED, AHMED M
• Application Number:
  US13/111,098
• Publication Number:
  US 20110290631A1
• Time in Patent Office: 1,048 Days
• Field of Search: None
• US Class Current: 200/600
• 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

Abstract

First conductive patterns, which each contain two or more first large lattices electrically connected by a first connection in series in a first direction, are formed on a first transparent substrate, and second conductive patterns, which each contain two or more second large lattices electrically connected by a second connection in series in a second direction perpendicular to the first direction, are formed on a second transparent substrate. As viewed from above, the first conductive patterns and the second conductive patterns are arranged adjacent to each other, and the first connection and the second connection are arranged facing each other. The first large lattices are electrically connected via three or more connection paths in the first connection, and the second large lattices are electrically connected via three or more connection paths in the second connection.

Claims

1. A conductive sheet comprising a substrate, a first conductive part formed on one main surface of the substrate, and a second conductive part formed on another main surface of the substrate, wherein

the first conductive part contains two or more first conductive patterns that each contain two or more first sensing sections electrically connected in series in a first direction by a first connection, the two or more first conductive patterns being arranged in a second direction perpendicular to the first direction such that the two or more first conductive patterns are electrically isolated from each other,

the second conductive part contains two or more second conductive patterns that each contain two or more second sensing sections electrically connected in series in the second direction by a second connection, the two or more second conductive patterns being arranged in the first direction such that the two or more second conductive patterns are electrically isolated from each other,

the first sensing sections and the second sensing sections each contain a combination of two or more small lattices,

the first conductive patterns are arranged adjacent to the second conductive patterns as viewed from above,

the first connection and the second connection are arranged facing each other with the substrate interposed therebetween,

the first sensing sections are electrically connected to each other via three or more connection paths in the first connection, and

the second sensing sections are electrically connected to each other via three or more connection paths in the second connection.

2. The conductive sheet according to claim 1, wherein

the first connection contains three or more conductive wires connecting one or more vertices of the small lattices in one first sensing section and one or more vertices of the small lattices in another first sensing section, and

the second connection contains three or more conductive wires connecting one or more vertices of the small lattices in one second sensing section and one or more vertices of the small lattices in another second sensing section.

3. The conductive sheet according to claim 1, wherein

the first connection contains a first conductive wire portion and a second conductive wire portion connecting one or more vertices of the small lattices in one first sensing section and one or more vertices of the small lattices in another first sensing section, a third conductive wire portion connecting another vertex of the small lattices in the one first sensing section and the first conductive wire portion, and a fourth conductive wire portion connecting another vertex of the small lattices in the other first sensing section and the second conductive wire portion, and

the second connection contains a fifth conductive wire portion and a sixth conductive wire portion connecting one or more vertices of the small lattices in one second sensing section and one or more vertices of the small lattices in another second sensing section, a seventh conductive wire portion connecting another vertex of the small lattices in the one second sensing section and the fifth conductive wire portion, and an eighth conductive wire portion connecting another vertex of the small lattices in the other second sensing section and the sixth conductive wire portion.

4. The conductive sheet according to claim 1, wherein

the first conductive part further contains a first auxiliary pattern containing a plurality of first auxiliary wires around a side of the first sensing sections,

the second conductive part further contains a second auxiliary pattern containing a plurality of second auxiliary wires around a side of the second sensing sections, and

the first auxiliary pattern and the second auxiliary pattern overlap with each other to form a combined pattern between the first conductive patterns and the second conductive patterns as viewed from above.

5. The conductive sheet according to claim 4, wherein the combined pattern contains a combination of two or more small lattices.

6. The conductive sheet according to claim 1, wherein the first sensing section and the second sensing section have substantially the same size or different sizes.

7. The conductive sheet according to claim 1, wherein the first sensing section comprises a substantially square large lattice, and the second sensing section comprises a substantially rectangular large lattice.

8. A conductive sheet comprising a substrate and a conductive part formed on a main surface of the substrate, wherein

the conductive part contains two or more conductive patterns that each contain two or more sensing sections composed of a thin metal wire electrically connected in series in a first direction by a connection composed of a thin metal wire, the two or more conductive patterns being arranged in a second direction perpendicular to the first direction such that the two or more conductive patterns are electrically isolated from each other,

the sensing sections each contain a combination of two or more small lattices, and

the sensing sections are electrically connected via three or more connection paths in the connection.

9. The conductive sheet according to claim 8, wherein when Na represents the number of the thin metal wires extending from contact points between one sensing section and the connection into the connection, Nb represents the number of the thin metal wires extending between a plurality of intersection points in the connection, Nc represents the number of the thin metal wires extending from contact points between another adjacent sensing section and the connection into the connection, and N represents the number of the connection paths between the two sensing sections, the conductive sheet satisfies N=Na×

(Nb+Nc−

1).

10. The conductive sheet according to claim 8, wherein

the connection contains a quadrangular portion arranged in a predetermined connection direction between the adjacent two sensing sections, and

the quadrangular portion contains a first quadrangular portion having thin metal wires opposing to each other at a distance La and a second quadrangular portion having thin metal wires opposing to each other at a distance Lb, and satisfies La>

Lb.

11. The conductive sheet according to claim 10, wherein the distance Lb is equal to a side length of the small lattices.

12. The conductive sheet according to claim 10, wherein the quadrangular portion satisfies 1.2×

Lb≦

La≦

3.0×

Lb.

13. The conductive sheet according to claim 10, wherein the quadrangular portion satisfies La=2×

Lb.

14. The conductive sheet according to claim 10, wherein the first quadrangular portion is arranged on each side of the second quadrangular portion.

15. The conductive sheet according to claim 8, wherein the connection contains a protrusion composed of a thin metal wire perpendicularly extending from a side, the length of the side being 3 or more times a side length of the small lattices.

16. The conductive sheet according to claim 15, wherein the protrusion extends toward an inside of the connection.

17. The conductive sheet according to claim 15, wherein the protrusion extends outward from the connection.

18. A conductive sheet comprising a substrate, a first conductive part formed on one main surface of the substrate, and a second conductive part formed on the other main surface of the substrate, wherein

the first conductive part contains two or more first conductive patterns that each contain two or more first sensing sections connected by a first connection, the two or more first sensing sections being arranged in the second direction perpendicular to the first direction such that the two or more first sensing sections are electrically isolated from each other,

the second conductive part contains two or more second conductive patterns that each contain two or more second sensing sections connected by a second connection, the two or more second sensing sections being arranged in the first direction such that the two or more second sensing sections are electrically isolated from each other,

the first conductive patterns and the second conductive patterns are approximately perpendicularly crossed on the connections,

the first conductive patterns and the second conductive patterns are composed of a thin wire pattern having a line width of 15 μ

m or less,

the first sensing sections are electrically connected via three or more connection paths in the first connection, and

the second sensing sections are electrically connected via three or more connection paths in the second connection.

19. A capacitive touch panel comprising a conductive sheet comprising a substrate, a first conductive part formed on one main surface of the substrate, and a second conductive part formed on another main surface of the substrate, wherein the first conductive part contains two or more first conductive patterns that each contain two or more first sensing sections electrically connected in series in a first direction by a first connection, the two or more first conductive patterns being arranged in a second direction perpendicular to the first direction such that the two or more first conductive patterns are electrically isolated from each other, the second conductive part contains two or more second conductive patterns that each contain two or more second sensing sections electrically connected in series in the second direction by a second connection, the two or more second conductive patterns being arranged in the first direction such that the two or more second conductive patterns are electrically isolated from each other, the first sensing sections and the second sensing sections each contain a combination of two or more small lattices, the first conductive patterns are arranged adjacent to the second conductive patterns as viewed from above, the first connection and the second connection are arranged facing each other with the substrate interposed therebetween, the first sensing sections are electrically connected to each other via three or more connection paths in the first connection, and the second sensing sections are electrically connected to each other via three or more connection paths in the second connection.

20. A capacitive touch panel comprising a conductive sheet comprising a substrate and a conductive part formed on a main surface of the substrate, wherein the conductive part contains two or more conductive patterns that each contain two or more sensing sections composed of a thin metal wire electrically connected in series in a first direction by a connection composed of a thin metal wire, the two or more conductive patterns being arranged in a second direction perpendicular to the first direction such that the two or more conductive patterns are electrically isolated from each other, the sensing sections each contain a combination of two or more small lattices, and the sensing sections are electrically connected via three or more connection paths in the connection.