Electric initiator resistant to actuation by radio frequency and electrostatic energies
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United States of America Patent
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May 21, 1985
Grant Date -
N/A
app pub date -
Nov 15, 1982
filing date -
Nov 15, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An RF-filter for an electric blasting cap comprises, in sequence from the cap's bridgewire, a first series-wired inductance plug (e.g., one or more ferrite beads), a shunt-wired resistance slug (e.g., conductive silicone rubber), two series-wired resistors (e.g., 27 ohm) in parallel geometry, and a second series-wired inductance plug adjacent the sealing plug on the cap. The filter elements are sheathed in a heat-resistant insulating and supporting sleeve, and an electrostatic flashover point is provided between the sealing plug and the inductance plug. The filter affords RF protection of 25 db between 1 and 4000 MHz, and withstands high current or voltage surges over a wide temperature range without permanent impairment.
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