Wiring board and method for manufacturing wiring board

Patent metadata

Field	Value
Publication number	US-12144108-B2
Application number	US-201917290633-A
Country	US
Kind code	B2
Filing date	Oct 31, 2019
Priority date	Oct 31, 2018
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

A wiring board includes a substrate, wiring, and a reinforcing part. The substrate is stretchable, and includes a first surface and a second surface located opposite to the first surface. The wiring is located at the first surface side of the substrate. The reinforcing part overlaps the wiring when viewed in a direction normal to the first surface of the substrate. The substrate has a control region and a non-control region. The control region overlaps the reinforcing part. The non-control region does not overlap the reinforcing part. The non-control region is positioned to sandwich the control region in a direction orthogonal to the direction in which the wiring extends.

First claim

The invention claimed is:

1. A wiring board comprising:
a substrate that is stretchable, the substrate including a first surface and a second surface located opposite to the first surface;
wiring located at the first surface side of the substrate;
a reinforcing part that overlaps the wiring when viewed in a direction normal to the first surface of the substrate; and
a support substrate including polyethylene naphthalate, polyimide, polycarbonate, acrylic resin, or polyethylene terephthalate, wherein
the substrate includes a control region that overlaps the reinforcing part and the support substrate, and a non-control region that overlaps the support substrate but that does not overlap the reinforcing part, the non-control region being positioned to sandwich the control region in a direction orthogonal to a direction in which the wiring extends,
the control region includes a plurality of ridges located at the first surface side of the substrate, the plurality of ridges extending across the control region in a direction transverse to the direction in which the wiring extends, the plurality of ridges being arranged in the direction in which the wiring extends,
the non-control region includes a plurality of intersecting ridge groups located at the first surface side of the substrate, the plurality of intersecting ridge groups each including a plurality of ridges that extend in different directions and cross each other, and
the ridges in the control region have a width greater than a width of the ridges in the non-control region.

2. The wiring board according to claim 1 , wherein the reinforcing part has a greater flexural rigidity or a greater elastic modulus than the substrate.

3. The wiring board according to claim 1 , wherein the reinforcing part is located at the first surface side of the substrate.

4. The wiring board according to claim 2 , wherein the wiring is located between the substrate and the reinforcing part.

5. The wiring board according to claim 2 , wherein the reinforcing part is located between the substrate and the wiring.

6. The wiring board according to claim 1 , wherein a dimension of the control region in the direction in which the wiring extends is greater than a dimension of the control region in the direction orthogonal to the direction in which the wiring extends.

7. The wiring board according to claim 1 , wherein a dimension of the control region in the direction in which the wiring extends is greater than or equal to 1.5 times a dimension of the control region in the direction orthogonal to the direction in which the wiring extends.

8. A wiring board comprising:
a substrate that is stretchable, the substrate including a first surface and a second surface located opposite to the first surface;
wiring located at the first surface side of the substrate;
a reinforcing part that overlaps the wiring when viewed in a direction normal to the first surface of the substrate, and
a support substrate including polyethylene naphthalate, polyimide, polycarbonate, acrylic resin, or polyethylene terephthalate, wherein
the substrate includes a control region that overlaps the reinforcing part and the support substrate, and a non-control region that overlaps the support substrate but that does not overlap the reinforcing part, the non-control region being positioned to sandwich the control region in a direction orthogonal to a direction in which the wiring extends,
the control region includes a plurality of ridges located at the first surface side of the substrate, the plurality of ridges extending across the control region in a direction transverse to the direction in which the wiring extends, the plurality of ridges being arranged in the direction in which the wiring extends,
the non-control region includes a plurality of intersecting ridge groups located at the first surface side of the substrate, the plurality of intersecting ridge groups each including a plurality of ridges that extend in different directions and cross each other, and
the ridges in the control region have an amplitude greater than an amplitude of the ridges in the non-control region.

9. A wiring board comprising:
a substrate that is stretchable, the substrate including a first surface and a second surface located opposite to the first surface;
wiring located at the first surface side of the substrate;
a reinforcing part that overlaps the wiring when viewed in a direction normal to the first surface of the substrate, and
a support substrate including polyethylene naphthalate, polyimide, polycarbonate, acrylic resin, or polyethylene terephthalate, wherein
the substrate includes a control region that overlaps the reinforcing part and the support substrate, and a non-control region that overlaps the support substrate but that does not overlap the reinforcing part, the non-control region being positioned to sandwich the control region in a direction orthogonal to a direction in which the wiring extends,
the control region includes a plurality of ridges located at the first surface side of the substrate, the plurality of ridges extending across the control region in a direction transverse to the direction in which the wiring extends, the plurality of ridges being arranged in the direction in which the wiring extends,
the non-control region includes a plurality of intersecting ridge groups located at the first surface side of the substrate, the plurality of intersecting ridge groups each including a plurality of ridges that extend in different directions and cross each other,
the control region includes a plurality of ridges located at the second surface side of the substrate, and
the ridge located at the second surface side of the substrate has an amplitude smaller than an amplitude of the ridge located at the first surface side of the substrate.

10. The wiring board according to claim 1 , wherein the substrate includes a thermoplastic elastomer, a silicone rubber, a urethane gel, or a silicone gel.

11. The wiring board according to claim 1 , wherein the support substrate has a greater elastic modulus than the substrate, and supports the wiring.

12. The wiring board according to claim 1 , wherein the support substrate is located between the wiring and the first surface of the substrate, and supports the wiring.

13. The wiring board according to claim 1 , wherein the support substrate is located between the substrate and the reinforcing part.

14. The wiring board according to claim 1 , further comprising an electronic component electrically connected to the wiring.

15. A method for manufacturing a wiring board, comprising: an elongation step of elongating a substrate by applying tensile stress to the substrate in a first direction and in a second direction transverse to the first direction, the substrate being stretchable; a wiring step of disposing wiring at a location adjacent to a first surface of the substrate that is in an elongated state; and a contraction step of removing the tensile stress from the substrate, wherein the wiring board includes a reinforcing part, the reinforcing part overlapping the wiring when viewed in a direction normal to the first surface of the substrate, and a support substrate including polyethylene naphthalate, polyimide, polycarbonate, acrylic resin, or polyethylene terephthalate, wherein the substrate includes a control region that overlaps the reinforcing part, support substrate and the wiring, and a non-control region that overlaps the support substrate but that does not overlap the reinforcing part, the non-control region being positioned to sandwich the control region in a direction ortho

Assignees

• Dainippon Printing Co Ltd

Inventors

• Okimoto Naoko
• Ogawa Kenichi
• Nagae Mitsutaka
• Sakata Makiko
• Miyoshi Toru

Classifications

• H05K1/0277

  Bendability or stretchability details (H05K1/038, H05K3/4691 take precedence) · CPC title

• H05K2201/057

  Shape retainable · CPC title

• H05K2201/2009

  Reinforced areas, e.g. for a specific part of a flexible printed circuit · CPC title

• H05K2201/09045

  Locally raised area or protrusion of insulating substrate · CPC title

• H05K2203/1461

  Applying or finishing the circuit pattern after another process, e.g. after filling of vias with conductive paste, after making printed resistors · CPC title