Electronic control module for detonator

Abstract

Electronic control module for a detonator comprising a printed circuit board ( 1 ) equipped with components of the circuit, enclosed in a tubular casing ( 12 ) embedded in a blocking resin ( 15 ) of the board in the casing, wherein a shielding screen ( 3 ) is interposed between the board ( 1 ) and the tubular casing ( 12 ), which screen has an insulating face turned towards the casing ( 12 ) and a conductive face ( 6 ) turned towards the board, the conductive face being electrically connected to the earth wire of the printed circuit board ( 1 ).

1 . Electronic control module for a detonator comprising a printed circuit board ( 1 ) equipped with components of the circuit, which is enclosed in a tubular casing ( 12 ) and is embedded in a blocking resin ( 15 ) held inside the casing, wherein it comprises a shielding screen ( 3 ) interposed between the board ( 1 ) and the tubular casing ( 12 ), provided with an insulating face turned towards the casing ( 12 ) and a conductive face ( 6 ) turned towards the board, the conductive face being electrically connected to the earth wire of the printed circuit board ( 1 ).  
   
   
       2 . Module according to  claim 1 , wherein the shielding screen ( 3 ) is formed by a sheet of flexible and elastic plastic material ( 5 ), the conductive face of which is covered with a conductive ink ( 6 ) except for a peripheral margin ( 7 ).  
   
   
       3 . Module according to  claim 2 , wherein the layer of conductive ink ( 6 ) is covered by an insulating protection film ( 8 ).  
   
   
       4 . Module according to  claim 1 , wherein the tubular casing ( 12 ) is formed by a section of seamless steel tubing and in that the blocking resin ( 15 ) is a polyurethane resin.  
   
   
       5 . Module according to  claim 1 , comprising in the known manner an electrochemnical capacitive component ( 2 ), wherein this component ( 2 ) has an outside shock absorption casing ( 16 ).