Patent ID: 7061599

Claim:
A protective film for a base substrate of a multi-layered board, the base substrate of a multi-layered board having a conductive pattern formed on one surface thereof, a bottomed hole having a bottom defined by the conductive pattern, and an interlayer connective material filled in the bottomed hole; wherein the protective film is attached to the base substrate of the multi-layered board at the other surface opposite from the one surface on which the conductive pattern is formed, the protective film including a resin film having a thickness of about 12 μm and an adhesive layer having a thickness of about 5 μm and an adhesive force, and the adhesive force is lowered when an UV ray is applied thereto; wherein the bottomed hole is formed in the base substrate of the multi-layered board and the interlayer connective material is filled in the bottomed hole from a surface side of attaching the protective film to protect the base substrate of the multi-layered board; and wherein at least one of the resin film and adhesive layer of the protective film is colored with a color, which reduces light reflectivity thereof.