Wiring body, wiring board, and touch sensor

Patent metadata

Field	Value
Publication number	US-10101865-B2
Application number	US-201615508853-A
Country	US
Kind code	B2
Filing date	Jan 29, 2016
Priority date	Jan 30, 2015
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

A wiring body includes a conductive portion that includes a contact surface having a concave-convex shape, and an adhesive layer stacked on the contact surface. The conductive portion further includes a top surface facing the contact surface that contains conductive particles. The adhesive layer includes a smooth portion with a smooth main surface provided at a constant thickness, and a protrusion that protrudes from the main surface toward a side of the conductive portion provided on the smooth portion to correspond to the conductive portion. The protrusion comes into contact with the contact surface and includes a concave-convex surface complementary to the concave-convex shape of the contact surface. The contact surface is positioned on a side of the top surface with respect to the main surface and a unit length of the contact surface is larger than a unit length of the top surface.

First claim

The invention claimed is:

1. A wiring body comprising:
a conductive portion including:
a first surface having a concave-convex in a section view in a longitudinal direction of a body of the conductive portion, wherein the first surface includes a concave portion and a convex portion;
a second surface facing the first surface, and
conductive particles dispersed within the conductive portion; and

a resin layer formed by being stacked on the first surface, wherein
the resin layer includes:
a smooth portion provided at a substantially constant thickness and having a substantially smooth main surface; and
a protrusion provided on the smooth portion to correspond to the conductive portion and protruding from the main surface toward a side of the conductive portion,

the protrusion comes into contact with the first surface and includes a concave-convex surface complementary to the concave-convex shape of the first surface,
the first surface is positioned on a side of the second surface with respect to the main surface, and
the following Formula (1) is satisfied:
L 1 >L 2   (1)

in the Formula (1), L 1 denotes a unit length of the first surface in the section view in the longitudinal direction of the body of the conductive portion, and L 2 denotes a unit length of the second surface in the section view in the longitudinal direction of the body of the conductive portion.

2. The wiring body according to claim 1 , wherein
the following Formula (2) is satisfied:
S 2 >S 1 ≥0.5S 2   (2)

in the Formula (2), S 1 denotes an average gap between the first surface and the second surface in the concave portion, and S 2 denotes an average gap between the first surface and the second surface in the convex portion.

3. The wiring body according to claim 1 , wherein
the first surface includes a waveform in which the concave portion and the convex portion are alternately continued, and
the following Formula (3) is satisfied:
100D 1 ≥S 3 ≥3D 1   (3)

in the Formula (3), S 3 denotes an average gap between adjacent convex portions, and D 1 denotes an average particle diameter of the conductive particles.

4. The wiring body according to claim 1 , wherein the following Formula (4) is satisfied:
S 4 ≥3D 2   (4)

in the Formula (4), S 4 denotes an average gap between the first surface and the second surface in the concave portion, and D 2 denotes an average particle diameter of the conductive particles.

5. The wiring body according to claim 1 , wherein an external shape of the conductive portion in a cross section in a short direction includes two straight line-shaped side surfaces inclined such that the side surfaces approach each other as being separated from the first surface.

6. A wiring board comprising:
the wiring body according to claim 1 ; and
a support that supports the wiring body.

7. A touch senor comprising the wiring board according to claim 6 .

8. The wiring body according to claim 1 , wherein the following Formula (5) is satisfied:
S 5 ≥3D 3   (5)

in the Formula (5), S 5 denotes an average height difference between the concave portion and the convex portion, and D 3 denotes an average particle diameter of the conductive particles.

Assignees

• Fujikura Ltd

Inventors

• Murakami Makoto

Classifications

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• H05K3/207 Primary

  using a prefabricated paste pattern, ink pattern or powder pattern · CPC title

• H05K2201/09681

  Mesh conductors, e.g. as a ground plane · CPC title

• H05K2201/09045

  Locally raised area or protrusion of insulating substrate · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title