Patent ID: 6972651

Claim:
A switch operable under a predetermined condition comprising; an electrically insulative base having an elongated shape; a plurality of switch parts each including a pair of first and second reed pieces; said first reed piece being fixed and having a terminal part at one end thereof, protruding from an end part of said electrically insulative base, and a contact part at the other end of said first reed piece, and said second reed piece having a flexible reed part at one end thereof, opposing said contact part of the first reed piece via a gap; a cover provided on said electrically insulative base and covering said first and second reed pieces of each of said switch parts; and a connecting member of an electrically conductive non-magnetic material via which said plurality of switch parts are serially connected, wherein: without external magnetic fields being applied, said first and second reed pieces of each pair are in an open state, and said switch operates only under a condition where all of said plurality of switch parts are operated by external magnetic fields individually and simultaneously acting on said plurality of switch parts.