ELECTROMAGNETIC DEVICE AND HIGH-FREQUECY SWITCH USING IT, AND VARIABLE ATTENUATOR

摘要

PROBLEM TO BE SOLVED: To provide an electromagnetic device used for driving a high-frequency relay capable of holding the state without using a spring or the like even when an excitaion of a coil is turned off. SOLUTION: A high-frequency switch SW comprises a columnar moving core 11 placed in a tubular bobbin 12, a coil 13 wound at the side peripheral part of the bobbin 12, and a ring magnet 16 magnetized in a radius direction arranged in a backward direction of the moving core 11 than the coil 13. Covering the bobbin 12 from a projecting direction of the moving core 11 by a U-shape-formed yoke 15 forms and holds a magnetic path with the magnet 16 and the moving core 11 at the time of the projection of the moving core 11 as shown in Fig.5(a). At the same time, providing a plate 17 comprising a magnetic material for limiting a backward working envelope of the moving core 11 in the backward direction of the moving core 11 of the bobbin 12 forms and holds a magnetic path with the magnet 16 and the moving core 11 at the time of the backward movement of the moving core 11 as shown in Fig.5(b). COPYRIGHT: (C)2007,JPO&INPIT