JPS6488524A - Electromagnetic actuator for driving shutter - Google Patents

Abstract

PURPOSE:To miniaturize a device and to reduce the consumption of a feeding power by functioning the leakage flux of an electromagnetic coil effectively with the function of the magnetic pole of a core leg, and increasing a shutter driving force at the time of opening a shutter by displacing a permanent magnet from a first position to a second position. CONSTITUTION:A device is constituted in such a way that the electromagnetic coil 39 is equipped by reducing a distance from the tip plane of a second core leg, and also, the permanent magnet 23 is displaced in the direction of the second core leg confronting with a first core leg at the time of performing the feeding of an electromagnet 37, and it is displaced in a direction opposite to the above case by stopping the feeding. In other words, the leakage flux of the electromagnetic coil functions effectively in addition to the magnetic function of a core magnetic pole, and the displacement operation of the permanent magnet can be accelerated remarkably. Since the leakage flux of the electromagnetic coil is utilized effectively in such way, it is possible to obtain the shutter driving force whose operating speed is accelerated without using a core with high quality or increasing the cross-section of the core to evade magnetic saturation. In such a way, it is possible to miniaturize the constitution of the device, and to obtain an electromagnetic actuator with low cost and with low power consumption.