Blackened surface-treated copper foil, method for producing blackened surface-treated copper foil, copper-clad laminate and flexible printed wiring board

摘要

Equipped with a blackened surface capable of improving CCD visibility and AOI inspection accuracy of flexible printed wiring boards in terminal connection processing, with appropriate roughness suitable for manufacturing flexible printed wiring boards, and good etching It aims at provision of the copper foil for printed wiring boards provided with a characteristic. In order to achieve this object, in the surface-treated copper foil provided with the roughened surface, the roughened surface has a maximum waviness difference (Wmax) of 1.2 μm or less, and an L * a * b * color system. A blackened surface-treated copper foil or the like for manufacturing a flexible printed wiring board, which is a black roughened surface having a lightness L * of 30 or less, is employed.