Patent ID: 7749610

Claim:
A copper foil which is characterized in that an area coefficient C(S), which is defined by A(S)/B(S) from a three-dimensional surface area A(S), which is obtained by performing three-dimensional measurement of a surface area of a nodular surface of a copper foil sample S under a laser microscope, and from a measuring region area B(S), which is an area of a measuring region of the three-dimensional surface area A(S), and a roughness R z (S) of a nodular surface of the copper foil sample S, which is measured by a stylus-type roughness meter, have a relationship of equation (1) below, and in that the roughness R z (S) is 1.0 μm to 3.0 μm, [Formula 1] 0.5 ×R z ( S )+0.5 ≦C ( S ) (1) where R z (S) is a numerical value represented by μm.