Electrode film and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-11397498-B2
Application number	US-201816640014-A
Country	US
Kind code	B2
Filing date	Jul 31, 2018
Priority date	Aug 30, 2017
Publication date	Jul 26, 2022
Grant date	Jul 26, 2022

Abstract

A method for manufacturing an electrode film includes the steps of laminating a metal layer and a black photoresist layer sequentially on a first main surface of a transparent base material, subjecting the black photoresist layer to patterning in a mesh shape by partially exposing the black photoresist layer and performing development, processing the metal layer into a metal mesh electrode by subjecting the metal layer to etching by using the black photoresist layer subjected to the patterning as an etching mask until the metal layer has a width smaller than a width of a thin wire line constituting a mesh of the black photoresist layer, and covering an upper surface and both side surfaces of a thin wire line constituting a mesh of the metal mesh electrode with the black photoresist layer by heating and softening the black photoresist layer to cause the black photoresist layer softened to flow.

First claim

The invention claimed is:

1. An electrode film, comprising:
a transparent base material;
a metal mesh electrode provided on a first main surface of the transparent base material; and
a black photoresist layer provided on an upper surface and both side surfaces of a thin wire line constituting a mesh of the metal mesh electrode,
the black photoresist layer including a multi-layered configuration that includes a heat flowable photoresist layer and a heat non-flowable photoresist layer provided on the heat flowable photoresist layer, at least one of the heat flowable photoresist layer or the heat non-flowable photoresist layer, or both, being colored.

2. The electrode film according to claim 1 , wherein the heat non-flowable photoresist layer has a softening point higher than a softening point of the heat flowable photoresist layer by 20° C. or more.

3. The electrode film according to claim 1 , wherein the black photoresist layer includes only two layers including the heat flowable photoresist layer and the heat non-flowable photoresist layer, and a thickness ratio of the heat flowable photoresist layer and the heat non-flowable photoresist layer is from 1:2 to 1:4.

4. The electrode film according to claim 1 , wherein a rustproof resist layer is provided between the heat flowable photoresist layer and the heat non-flowable photoresist layer.

5. The electrode film according to claim 1 , wherein the heat flowable photoresist layer contains a rustproof agent.

6. The electrode film according to claim 1 , wherein only the heat non-flowable photoresist layer is colored.

7. The electrode film according to claim 1 , wherein only the heat flowable photoresist layer is colored.

8. A method for manufacturing an electrode film, the method comprising the steps of:
laminating a metal layer on a first main surface of a transparent base material, and further laminating, on the metal layer, a black photoresist layer including a multi-layered configuration that includes a heat flowable photoresist layer and a heat non-flowable photoresist layer provided on the heat flowable photoresist layer, at least one of the heat flowable photoresist layer or the heat non-flowable photoresist layer, or both, being colored;
subjecting the black photoresist layer to patterning in a mesh shape by partially exposing the black photoresist layer and performing development;
processing the metal layer into a metal mesh electrode by subjecting the metal layer to etching by using the black photoresist layer subjected to the patterning as an etching mask until the metal layer has a width smaller than a width of a thin wire line constituting a mesh of the black photoresist layer; and
covering an upper surface and both side surfaces of a thin wire line constituting a mesh of the metal mesh electrode with the black photoresist layer by heating and softening the black photoresist layer to cause the black photoresist layer softened to flow.

9. The method for manufacturing an electrode film according to claim 8 , wherein the heat non-flowable photoresist layer has a softening point higher than a softening point of the heat flowable photoresist layer by 20° C. or more.

10. The method for manufacturing an electrode film according to claim 8 , wherein the black photoresist layer includes only two layers including the heat flowable photoresist layer and the heat non-flowable photoresist layer, and a thickness ratio of the heat flowable photoresist layer and the heat non-flowable photoresist layer is from 1:2 to 1:4.

11. The method for manufacturing an electrode film according to claim 8 , wherein a rustproof resist layer is provided between the heat flowable photoresist layer and the heat non-flowable photoresist layer.

12. The method for manufacturing an electrode film according to claim 8 , wherein the heat flowable photoresist layer contains a rustproof agent.

13. The method for manufacturing an electrode film according to claim 8 , wherein only the heat non-flowable photoresist layer is colored.

14. The method for manufacturing an electrode film according to claim 8 , wherein only the heat flowable photoresist layer is colored.

Assignees

• Nissha Co Ltd

Inventors

• Omote Ryomei
• Nishikawa Kazuhiro
• Sakata Yoshihiro
• Nishimura Takeshi
• Sunahase Takakuni

Classifications

• G06F3/0446 Primary

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• B32B27/36

  comprising polyesters · CPC title

• G06F3/0445 Primary

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

• B32B27/286

  comprising polysulphones; polysulfides · CPC title