JPS6481932A - Control magnet device in electric shutter - Google Patents

Abstract

PURPOSE:To reduce the size of an electromagnet device and to reduce the power consumption by using a permanent magnet so as to hold an armature at a constant distance from the electromagnet device at the time of nonexcita tion. CONSTITUTION:The permanent magnet 13 is provided nearby the armature 11 which is attracted by the electromagnet device 15 to operate so as to hold the armature 11 at the constant distance from the electromagnet device 15 at the time of nonexcitation, and the armature 11 is held at the constant distance from the electromagnet device 15 with the attracting force of the permanent magnet 13. When the attracting force operating between the permanent magnet 13 and armature 11 is so set that the armature 11 does not move from the constant position with the electromagnet device 15 owing to an error in the attitude of a camera, the attracting force which attracts the armature 11 by feeding electricity to the electromagnet device 15 may be small. Consequently, the electromagnet device 15 is reduced in size and the current consumption is also reduced.