Touch sensor and production method for same

Patent metadata

Field	Value
Publication number	US-2016011683-A1
Application number	US-201414771379-A
Country	US
Kind code	A1
Filing date	Mar 28, 2014
Priority date	Mar 28, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

A touch sensor ( 2 ) includes: a substrate ( 21 ); a net-shaped electrode ( 22 ) which is provided on the substrate ( 21 ) and includes conductive wires ( 221 ) arranged in a net form; and an outer edge wire ( 23 ) which is provided in at least a part of an outer edge of the net-shaped electrode ( 22 ) and is integrally formed with the net-shaped electrode. The conductive wire ( 221 ) includes a large-width portion which is provided in at least one of lateral parts of a connection portion and gradually widens according to approaching the outer edge wire ( 23 ), and the connection portion is a portion of the conductive wire ( 221 ) which is connected to the outer edge wire ( 23 ). Expressions (1) and (2) are satisfied:
A≦100 [μm]  (1)

B/A ≧½  (2).

In Expressions (1) and (2), “A” is a width of the outer edge wire ( 23 ), and “B” is a largest width of the conductive wires ( 221 ) in a portion where the large-width portion ( 222 ) is provided.

First claim

1 . A touch sensor comprising:
a substrate; a net-shaped electrode which is provided on the substrate and includes conductive wires arranged in a net form; and an outer edge wire which is provided in at least a part of an outer edge of the net-shaped electrode and is integrally formed with the net-shaped electrode, wherein p 1 the conductive wire includes a large-width portion which is provided in at least one of lateral parts of a connection portion and gradually widens according to approaching the outer edge wire, the conductive portion being a portion of the conductive wire which is connected to the outer edge wire, and Expressions (1) and (2) are satisfied:
A≦100 [μm]  (1)

B/A≧ ½  (2)

in Expressions (1) and (2), “A” is a width of the outer edge wire, and “B” is a largest width of the conductive wire in a portion where the large-width portion is provided.

2 . The touch sensor according to claim 1 , wherein
Expression (3) is satisfied:
C/A≧ 1/20  (3)

in Expression (3), “C” is a width of the conductive wire excluding the large-width portion.

3 . A production method for a touch sensor, comprising:
filling a conductive paste in a recess pattern formed in an intaglio and moving a doctor blade so as to slide with respect to the intaglio; and transferring the conductive paste to a transfer object, wherein the recess pattern includes: a net-shaped recess which includes linear recesses arranged in a net form; and an outer edge recess which is provided to be continuous to at least a part of an outer edge of the net-shaped recess, the linear recess includes a large-width recess which is provided in at least one of lateral parts of a connection portion and gradually widens according to approaching the outer edge recess, the connection portion being a portion of the linear recess which is connected to the outer edge recess, and Expressions (4) and (5) are satisfied:
a≦100 [μm]  (4)

b/a≧ ½  (5)

in Expressions (4) and (5), “a” is a width of the outer edge recess, and “b” is a largest width of the linear recess in a portion where the large-width recess is provided.

4 . The production method for the touch sensor according to claim 3 , wherein
Expression (6) is satisfied:
c/a≧ 1/20  (6)

in Expression (6), “c” is a width of the linear recess excluding the large-width recess.

5 . The touch sensor according to claim 1 , wherein
the outer edge wire includes: a first extension wire portion which extends along a first direction and is connected to the net-shaped electrode; and a second extension wire portion which extends from the first extension wire portion along a second direction and is connected to the net-shaped electrode, and the first and second directions are directions on different straight lines.

6 . The touch sensor according to claim 5 , wherein
Expression (7) is satisfied:
15[°]<θ<165[°]  (7)

in Expression (7), “θ” is an angle between the first and second directions on a side where the net-shaped electrode is connected.

7 . The touch sensor according to claim 1 , wherein
the outer edge wire includes a curved portion.

8 . The production method for the touch sensor according to claim 3 , wherein
the outer edge recess includes: a first extension portion which extends along a first direction and is connected to the net-shaped recess; and a second extension portion which extends from the first extension portion along a second direction and is connected to the net-shaped recess, and the first and second directions are directions on different straight lines.

9 . The production method for the touch sensor according to claim 8 , wherein
Expression (8) is satisfied:
15[°]<θ<165[°]  (8)

in Expression (8), “θ” is an angle between the first and second directions on a side where the net-shaped electrode is connected.

10 . The production method for the touch sensor according to claim 3 , wherein
the outer edge recess includes a curved portion.

Assignees

• Fujikura Ltd

Inventors

• Koshimizu Kazutoshi
• Aoshima Shinsuke
• Iguchi Yusuke

Classifications

• G06F2203/04103

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

• G06F1/16

  Constructional details or arrangements · CPC title

• G06F3/041 Primary

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

• 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

• G06F3/04164 Primary

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title