Ignition Device, Gas Generator for Air Bag and Gas Generator for Seat Belt Pretensioner

Abstract

The invention provides an ignition device having a high shielding-performance from electro-magnetic wave noise and the like, while being compact in size and enabling electric current securely to flow through electric circuits built in the ignition device. The ignition device includes a metal cup and a metal header for holding a plurality of electrode pins respectively insulated and closing the opening of the cup to integrate the header in the cup, and further includes, in the cup, ignition charge, an ASIC, a capacitor, and a heating element. The ASIC is electrically connected to the electrode pins, the capacitor and the heating element, respectively, and the heating element abuts against the ignition charge. The header is provided on its outer periphery with a metal flange for fixing the header to an installation body of the ignition device.

1 . An ignition device including a metal cup and a metal header for holding a plurality of electrode pins respectively insulated and closing the opening of said cup to integrate the header in said cup, and further including, in said cup, ignition charge, an ASIC, a capacitor, and a heating element, said ASIC being electrically connected to said electrode pins, said capacitor and said heating element, respectively, and said heating element abutting against said ignition charge, characterized in that said header comprises on its outer periphery a metal flange for fixing the header to an installation body of the ignition device. 
   
   
       2 . The ignition device as claimed in  claim 1 , characterized comprising an ASIC component including said ASIC and said capacitor both mounted on a substrate molded with a resin to form a resin mold, said resin mold having at its top the heating element connected to said ASIC and at the bottom communication electrodes for connecting said ASIC to said electrode pins. 
   
   
       3 . The ignition device as claimed in  claim 2 , characterized in that said electrode pins and said communication electrodes are jointed to each other under pressure. 
   
   
       4 . The ignition device in  claim 1 , characterized in that said heating element and said ignition charge are in contact with each other under pressure. 
   
   
       5 . The ignition device in  claim 1 , characterized in that the upper surface of said heating element is coated with an ignition charge composition. 
   
   
       6 . The ignition device in  claim 1 , characterized in that said heating element comprises a semiconductor bridge chip. 
   
   
       7 . The ignition device in  claim 6 , characterized in that said semiconductor bridge chip includes a bridge formed by laminating a metal and an insulator. 
   
   
       8 . A gas generator for an air bag, characterized in that said flange provided on the ignition device as claimed in  claim 1  is electrically connected and fixed to a metal section of the installation body of the ignition device provided in said gas generator by means of caulking or welding. 
   
   
       9 . A gas generator for a seat belt pretensioner, characterized in that said flange provided on the ignition device as claimed in  claim 1  is electrically connected and fixed to a metal section of the installation body of the ignition device provided in said gas generator by means of caulking or welding. 
   
   
       10 . The ignition device in  claim 2 , characterized in that said heating element and said ignition charge are in contact with each other under pressure. 
   
   
       11 . The ignition device in  claim 2 , characterized in that the upper surface of said heating element is coated with an ignition charge composition. 
   
   
       12 . The ignition device in  claim 2 , characterized in that said heating element comprises a semiconductor bridge chip. 
   
   
       13 . A gas generator for an air bag, characterized in that said flange provided on the ignition device as claimed in  claim 2  is electrically connected and fixed to a metal section of the installation body of the ignition device provided in said gas generator by means of caulking or welding. 
   
   
       14 . A gas generator for a pretensioner, characterized in that said flange provided on the ignition device as claimed in  claim 2  is electrically connected and fixed to a metal section of the installation body of the ignition device provided in said gas generator by means of caulking or welding. 
   
   
       15 . The ignition device in  claim 3 , characterized in that said heating element and said ignition charge are in contact with each other under pressure. 
   
   
       16 . The ignition device in  claim 3 , characterized in that said heating element comprises a semiconductor bridge chip. 
   
   
       17 . A gas generator for an air bag characterized in that said flange provided on the ignition device as claimed in  claim 3  is electrically connected and fixed to a metal section of the installation body of the ignition device provided in said gas generator by means of caulking or welding. 
   
   
       18 . A gas generator for a pretensioner, characterized in that said flange provided on the ignition device as claimed in  claim 3  is electrically connected and fixed to a metal section of the installation body of the ignition device provided in said gas generator by means of caulking or welding. 
   
   
       19 . The ignition device in  claim 4 , characterized in that the upper surface of said heating element is coated with an ignition charge composition. 
   
   
       20 . The ignition device in  claim 2 , characterized in that said heating element comprises a semiconductor bridge chip.