| 摘要 |
PURPOSE:To improve a magnetic effect and reduce the production cost by mounting a coil after forming a yoke into a U-shaped form and by causing an end part of facing pieces to have a flat part as the other end of the yoke, thereby making a yoke width larger than an inside diameter of an air-core part; besides, making a pointed end width of an armature larger than that in the air-core part of the coil. CONSTITUTION:A yoke 4 is formed into a U-shaped form where a space between facing pieces is almost equal to an axial length of coil and the coil 1 is mounted on the yoke and further, a flat part 4c extending from an end part of the facing pieces 4a to an outer direction is arranged so that a width of the other side of the yoke 4 sucking an armature 5 as well as that of the flat part 4c is larger than an inside diameter of an air-core part 2 of the coil and the width of a pointed end 5b of the armature 5 is larger than that of a part holding its position in the air-core part of the coil. This approach can suppress an increase of the magnetic reluctance of the yoke and eliminates the need for performing polymerization contact; besides, may secure facing areas and yet a part performing a contact-release (sucking release) operation is not restricted by the air-core part, thereby improving a magnetic effect at the least cost.
|
