| 摘要 |
An electric safety squib having a grounded outer case and a pair of normally ungrounded terminals includes a closed thermally and electrically conductive container filled with pyrotechnic material. An electrical resistance wire is embedded in the pyrotechnic material for controlled ignition thereof. A separate conductor extends from each of the terminals to an associated end of the resistance wire through a resistive header and a chamber holding ferrite beads whereby energy of radio-frequency and electrostatic origin extraneously induced in the terminals and conductors is dissipated into the bulk of the conductors, the resistive header and ferrite beads. The arrangement features the disposition of the ferrite beads in good heat transfer relation with the chamber walls whereby heat is carried away from the ferrite beads to limit any rise in temperature thereof, and further features the connection of the junction of one of the conductors and the resistance wire directly to the container wall, and the spacing of the container wall with respect to the outer case to provide a measured spark gap therebetween whereby radio-frequency and electrostatic energy above a threshold value that may reach the resistance wire is conducted by the walls of the container around and away from the pyrotechnic material and is discharged through the spark gap, thereby preventing such energy from passing through the pyrotechnic charge and developing enough concentrated heat to ignite it.
|
