Patent ID: 6078232
Filing Date: 2000-06-20
Classification: H01H

Abstract:
An electromagnetic relay comprising:a board, said board including:a plurality of signal fixed contacts constituting terminals of a signal transmission path; andan earth fixed contact connected to a ground;a plurality of movable spring parts each made of a plate conductive member, each movable spring part including:a signal contact spring having a signal contact which connects said signal fixed contacts to each other;an earth contact spring having an earth contact connected to said earth fixed contact; anda spring connection portion which connects said signal contact spring to said earth contact spring;a spring fixing member which fixes said signal contact spring, said earth contact spring and said spring connection portion to said board;an armature made of a magnetic member and arranged to be rockable with a position matching with said spring fixing part,said armature including a first end portion which presses said signal contact spring against said signal fixed contacts and a second end portion which presses said earth contact spring against said earth fixed contact, andsaid armature and each of said movable portions being arranged such that torques acting on said armature cancel one another by a repulsion of each of said contact springs when said signal contact spring and said earth contact spring are pressed against said board; anda magnetic force generating part having a first magnetic pole and a second magnetic pole magnetizing said first and second end portions of said armature, respectively,said earth contact spring and said earth fixed contact being closed when said first end portion is magnetized by said first magnetic pole, andsaid signal contact spring and said signal fixed contacts being closed when said second end portion is magnetized by said second magnetic pole.