Patent ID: 7082679
Filing Date: 2006-08-01
Classification: H05K,Y10T

Abstract:
1. A method for fabricating a rigid-flexible printed circuit board, comprising the steps of: providing a first base board including a liquid crystalline polymer one or both sides of which are covered with a copper foil layer; conducting image processing on the copper foil layer to form an inner circuit pattern; forming a coverlay with a liquid crystalline polymer over a portion of the inner circuit pattern which corresponds to a flexible region of the first base board; bonding the first base board to another first base board using an adhesive material in such a way that the liquid crystalline polymers of the resulting structure are interleaved with the adhesive material and face each other, said adhesive material being open at a portion corresponding to the flexible region; depositing a second base board, consisting of a copper foil layer and a liquid crystalline polymer layer, over each side of the bonded first base board structure in such a way that the liquid crystalline polymer layer of the second base board is positioned to face to the inner circuit pattern of the first base board, said liquid crystalline polymer being open at a portion corresponding to the flexible region; conducting image processing on the copper foil layer of the second base board to form an outer circuit pattern; forming a coverlay with a liquid crystalline polymer over a portion of the outer circuit pattern which corresponds to the flexible region; and applying a photo imageable solder resist mask ink to form a solder mask for protecting the outer circuit pattern from a soldering process.