# US 10,483,014 B2 · Rolled copper foil, method of manufacturing a rolled copper foil, flexible flat cable, and method of manufacturing a flexible flat cable

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- Number: US 10,483,014 B2
- Document ID: US10483014B2
- Status: Granted
- Kind: B2
- Application number: 15/279,821
- Filed: 2016-09-29
- Published: 2017-01-19
- Granted: 2019-11-19
- Earliest claimed: 2014-03-31
- Assignees: Furukawa Electric Co., Ltd.; Furukawa Automotive Systems Inc.
- Applicants: Furukawa Electric Co., Ltd.; Furukawa Automotive Systems Inc.
- Inventors: Ryosuke Matsuo; Kengo Mitose
- Web page: https://patentgrep.com/patent/US10483014B2

## CPC

- H01B 7/08: Flat or ribbon cables
- B21C 1/02: Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
- C22C 9/00: Alloys based on copper
- C22F 1/08: of copper or alloys based thereon
- H01B 1/026: {Alloys based on copper}
- H01B 3/421: {Polyesters}
- H01B 7/04: Flexible cables, conductors, or cords, e.g. trailing cables
- H01B 13/0003: {for feeding conductors or cables}
- H01B 13/0016: {for heat treatment}
- H01B 13/06: Insulating conductors or cables (H01B13/32 takes precedence)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- B21C: MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)

## 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%.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.