Patent ID: 7009157

Claim:
Procedure for soldering the constituent layers of a multilayer printed circuit, applicable to multilayer printed circuits made up of a mix of layers containing the circuit image ( 2 , 3 , 4 and 5 ) and isolating layers ( 6 , 7 and 8 ), the layers with the circuit image ( 2 , 3 , 4 , 5 ) having perimetral strips ( 9 ) where multiple reserve areas ( 11 ) are located in equal number and arrangement for each layer that includes the following steps: i) place a heater circuit ( 13 ) composed of a flat winding with at least one turn in short-circuit ( 14 ) in the reserve area ( 11 ) of each layer containing the circuit image ( 2 , 3 , 4 and 5 ); ii) arrange the layers containing the circuit image ( 2 , 3 , 4 , 5 ) so that they are superimposed and separated from each other by an isolating layer ( 6 , 7 and 8 ) in order to create the book of layers of the multilayer printed circuit, in which can be distinguished a top layer containing the circuit image ( 2 ) and a bottom layer containing the circuit image ( 5 ); iii) secure the position of the layers ( 2 , 3 , 4 , 5 , 6 , 7 , 8 ) of the multilayer printed circuit ( 1 ), relative to each other, in such a way that the corresponding reserve areas ( 11 ) of the layers containing the circuit image ( 2 , 3 , 4 , 5 ,) occupy the same relative position, thereby creating groups ( 12 ) of superimposed reserve areas ( 11 ) and, consequently, groups of superimposed heater circuits ( 13 ); iv) in each group ( 12 ) of reserve areas ( 11 ), place one induction electrode ( 18 ) over the reserve area ( 11 ) of the top layer containing the circuit image ( 2 ), and a induction electrode ( 19 ) over the opposite side of the reserve area ( 11 ) of the bottom layer containing the circuit image ( 5 ); and v) solder each group ( 12 ) of reserve areas ( 11 ) by application through the two induction electrodes ( 18 , 19 ) of a magnetic field of variable induction, that generates through induction in each of the turns in short-circuit ( 14 ) of each heater circuit ( 13 ) of each reserve area ( 11 ) of each layer containing the circuit image ( 2 , 3 , 4 , , and 5 ) a current intensity whose circulation through the turns in short-circuit produces the heat necessary to solder the layers ( 2 , 3 , 4 , 5 , 6 , 7 , 8 ) of the multilayer printed circuit ( 1 ).