| 摘要 |
<p>An upper housing (52) is ultrasonically welded to a lower housing (50) forming a hermetic seal about two opposed ferromagnetic leads (24, 26) extending from a reed switch (22). A shock sensing magnet (36) has a cylindrical bore (42) and is spring biased (54) within the housing to slide along the glass capsule (28) of the reed switch in response to acceleration. The magnet functions as a shock sensing mass, and is shaped to increase the reed switch dwell time. The reed switch leads are bent to extend downwardly along the sides of the housing and are bent horizontally to be parallel to the housing sides and a circuit board. A strip of mu-metal wraps three sides of the housing (48) and has tabs extending partly beneath the housing for soldering to the circuit board. The magnet and the housing are constructed from plastics that can withstand momentary high temperature associated with a re-flow solder process.</p> |
