CONTACTLESS MICRO SWITCH

摘要

PURPOSE:To reduce a stroke to make the contactless micro switch small-size and long-life and further improve noise-proof characteristic by arranging a magnetoelectric converter between fixed and moving permanent magnets which are so provided that magnetic poles of the same polarity may be oppsote to each other. CONSTITUTION:Pellet 30 of a Hall IC or a magnetroelectric converter which is turned on and off with a prescribed hysteresis according to only components in a prescribed direction of magnetid flux density effectively is arranged between fixed permanent magnet 60 and moving permanent magnet 70 where magnetic poles of the same polarity are opposite to each other at a prescribed interval. Effective magnetic flux density B+ and diminishing magnetic flux density B+ and diminishing magnetic flux density B- are given to IC pellet 30 from fixed permanent magnet 60 and moving permanet magnet 70 respectively, and moving permanent magnet 70 is reciprocated on a basis of the operation of an operation part so that distance between magnet 70 and IC pellet 30 may be changed, thereby changing the magnetic flux given to IC pellet 30.