COMPOSITE COPPER FOIL AND PRODUCTION METHOD THEREOF

摘要

The invention provides a composite copper foil and a manufacturing method therefor. At the same time of sustaining transmittance of substrate, high adaption witht the substrate is obtained. The composite copper foil is provided with a yoked copper foil, a copper coating layer formed on at least one face of the yoked copper foil and a coarsh copper coating layer formed on the copper coating layer and containing coarse grannula whose average diameter is greater than 0.05 micrometer and smaller than 0.30 micrometer. The ratio of the greater diameter to the smaller diameter of the coarse grannules is smaller than 65 percents. The coarse grannules distribute continuously in a distance larger than 20 micrometers and are connected on the copper coating layer in a cross section in the thickness direction of the coarse copper coating layer.