Rolled copper foil, method of manufacturing a rolled copper foil, flexible flat cable, and method of manufacturing a flexible flat cable

Patent metadata

Field	Value
Publication number	US-10522268-B2
Application number	US-201615279821-A
Country	US
Kind code	B2
Filing date	Sep 29, 2016
Priority date	Mar 31, 2014
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A rolled copper foil comprises one of copper and a copper alloy. The rolled copper foil has a rolled surface and two side surfaces adjacent to the rolled surface. Each of the side surfaces being a non-sheared surface that is not a sheared surface. An area ratio of crystal grains oriented at a deviation angle of less than or equal to 13° from Cube orientation is greater than or equal to 6%.

First claim

What is claimed is:

1. A rolled copper foil comprising one of copper and a copper alloy, the rolled copper foil having a rolled surface and two side surfaces adjacent to the rolled surface, each of the side surfaces being a non-sheared surface, wherein
the rolled copper foil has a width of 0.300 mm to 2.000 mm and a thickness of 0.010 mm to 0.200 mm,
an area ratio A of crystal grains oriented at a deviation angle of less than or equal to 13° from Cube orientation being greater than or equal to 6%,
at two end regions each corresponding to 10%-width in a transverse direction, an area ratio B of crystal grains oriented at a deviation angle of less than or equal to 13° from Cube orientation is greater than or equal to 15%,
wherein the rolled copper foil has a flex life cycle of 500,000 cycles or more,
the rolled copper foil is hard copper in which stress is accumulated due to plastic working, and
the rolled copper foil is formed by subjecting a planar wire rod to a finish rolling process so that a thickness reduction ratio Z is 50% or less.

2. The rolled copper foil according to claim 1 , wherein the rolled copper foil comprises a copper alloy comprising a total of greater than or equal to 0.005 mass % and less than or equal to 1.0 mass % of at least one element selected from Mg, Zn, Sn, Ag, P, Cr, Si, Zr, Ti, and Fe, the balance being copper and incidental impurities.

Assignees

• Furukawa Electric Co Ltd
• Furukawa Automotive Systems Inc

Inventors

• Matsuo Ryosuke
• Mitose Kengo

Classifications

• H01B3/421

  Polyesters · CPC title

• H01B1/026

  Alloys based on copper · CPC title

• H01B13/0003

  for feeding conductors or cables · CPC title

• H01B13/06

  Insulating conductors or cables (H01B13/32 takes precedence) · CPC title

• H01B7/04

  Flexible cables, conductors, or cords, e.g. trailing cables · CPC title