Patent ID: 7000316

Claim:
A method for producing a conductor board or print board having at least one ceramic layer ( 2 ) with at least one aperture ( 6 ) there through, at least two metal layers ( 3 , 4 ), one on each side of said ceramic layer ( 2 ), and an electrical through contact ( 5 , 5 a , 5 b ) in said at least one aperture ( 6 ), said method comprising: (a) applying one of each of said metal layers ( 3 , 4 ) on each side of said ceramic layer ( 2 ) by a direct copper bonding technique or by an active soldering technique, such that said metal layers ( 3 , 4 ) cover said aperture ( 6 ) on each side of said ceramic layer ( 2 ); (b) permanently deforming one of said metal layers ( 3 ) into said aperture ( 6 ) by means of a stamp ( 7 , 7 a , 7 b ) while supporting the other of said metal layers ( 4 ) on a rest ( 10 ) such that a cone shaped segment ( 3 ′, 3 a ′, 3 b ′) is formed in said aperture; and (c) connecting said segment ( 3 ′, 3 a ′, 3 b ′) to said other of said metal layers ( 4 ) by electrical welding, with the stamp ( 7 , 7 a , 7 b ) and the rest ( 10 ) being used as welding electrodes, in order to form said electrical contact ( 5 , 5 a , 5 b ) and produce said conductor board.