Rectangular rolled copper foil, flexible flat cable, rotary connector, and method of manufacturing rectangular rolled copper foil
AssigneesFurukawa Electric Co., Ltd., Furukawa Automotive Systems Inc.
InventorsRyosuke Matsuo, Kengo Mitose
Life of this patent
Estimating the term…
Abstract
A rectangular rolled copper foil includes copper or a copper alloy having a 0.2% yield strength of greater than or equal to 250 MPa. In a cross section perpendicular to a rolling direction, an area ratio of crystal grains oriented at a deviation angle of less than or equal to 12.5° from a Cube orientation is greater than or equal to 8%.
Claims8
A rectangular rolled copper foil comprising copper or a copper alloy having a 0.2% yield strength of greater than or equal to 250 MPa, wherein, in a cross section perpendicular to a rolling direction, an area ratio of crystal grains oriented at a deviation angle of less than or equal to 12.5° from a Cube orientation is greater than or equal to 8%.
A method of manufacturing a rectangular rolled copper foil comprising copper or a copper alloy having a 0.2% yield strength of greater than or equal to 250 MPa, wherein, in a cross section perpendicular to a rolling direction, an area ratio of crystal grains oriented at a deviation angle of less than or equal to 12.5° from a Cube orientation is greater than or equal to 8%, the method comprising:
- after performing casting, hot rolling, first cold rolling, and a first heat treatment with recrystallization in this order, performing second cold rolling at a reduction of area of greater than or equal to 75% to form a foil material;
- performing a second heat treatment to the foil material between 200° C. and 600° C. for 1 second to 2 hours;
- and
- performing third cold rolling of cold rolling the foil material after the second heat treatment at a reduction of area of greater than or equal to 5% to form a foil material.
Dependencies are inferred from the claim text.