Patent ID: 7754623
Filing Date: 2010-07-13
Classification: H01L,H05K

Abstract:
1. A film hole forming apparatus for forming holes in a printed circuit board, the printed circuit board comprising a base film, two nichrome alloy layers formed on two opposite surfaces of the base film, and two copper films formed on the nichrome alloy layers, respectively, the copper films having copper holes formed therein, the nichrome alloy layers having nichrome holes formed therein, the nichrome holes being respectively in communication with the copper holes to expose portions of the base film, the film hole forming apparatus comprising: a chemical etching system comprising an activating bath, a chemical etching bath, a water-washing bath, a slight-etching bath, and an end-washing bath in that sequence, the activating bath being configured for cleaning the printed circuit board, the chemical etching bath being configured for etching portions of the base film exposed at the nichrome holes and the copper holes, the water-washing bath being configured for washing the printed circuit board, the slight-etching bath being configured for removing portions of the nichrome alloy layers corresponding to the exposed portions of the base film, and the end-washing baths being configured for washing the printed circuit board; and a driving system comprising a transmission belt passing through the activating bath, the chemical etching bath, the water-washing bath, the slight-etching bath, and the end-washing bath, the transmission belt being configured for carrying the printed circuit board, a material of the transmission belt being polytetrafluoroethylene-containing material.