| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the reluctance of a magnetic circuit and a magnetic loss, and also to reduce noise radiation to the exterior and the reception of the influence of noise by using a damping steel sheet of laminated structure for a coil case and having a claw part which is bent along the lower surface of the bottom plate of a fixed iron core in the lower end part of the coil case. SOLUTION: A coil 2 is wound on a cylindrical coil bobbin 40 and has a lead wire 10. The fixed iron core 3 has an operating shaft hole 30 at the center and also has a brim-like bottom plate and a mounting screw 13 in the lower part. An external thread is provided in the upper end of the operating shaft 24 provided so that it passes through the operating shaft hole 30 of the fixed iron core 3 and can slide there, and the external thread is screwed into the operating shaft inserting screw part 35 of a moving iron core 21. The coil case 15 is made of a damping steel sheet having a viscoelastic resin layer 15a between two iron plate layers 15c. The coil case 15 also has a plurality of claws 15b in the lower part and a hole 31 in the upper part.</p> |
