| 摘要 |
PURPOSE:To remove an evil producing an unwilling vacant space between a through hole of a frame-shaped yoke and a metal cylindrical body for leading- out an output terminal by providing the through hole of a metal sheet with a short cylindrical color part while pressing said color part against the peripheral surface of the metal cylindrical body for leading-out the output terminal. CONSTITUTION:A metal sheet 23 lying between one end surface 18a of a frame- shaped yoke 18 and a ring permanent magnet 16 is formed, while its through hole is provided with a short cylindrical color part 24 and said color part 24 is pushed against the peripheral surface of a metal cylindrical body 5 for leading-out an output terminal. Further, positional slippage of the permament magnet 16 is prevented by providing a plural number of nail parts 25 on the circumference cocentric to the color part 24 by cutting up while pressing the nail parts 25 against the inner peripheral surface of the ring permanent magnet 16. However, the metal sheet 23 made of iron or an iron alloy has a thickness of 0.2-0.5mm, while the metal cylindrical body 5 is pressed into the short cylindrical color part formed by paring by means of shrink fit or the like for being fixed. |
