| 摘要 |
PURPOSE:To make improvements in performance as well as to reduce the cost of production by unifying a yoke and a mounting member as one body. CONSTITUTION:A lower mount 12 formed with a ferromagnetic material is provided with a groove part 82, and a bobbin 86 wound up with a coil 84 is directly housed in this groove part 82. In addition, a ferromagnetic boss 92 and a disklike permanent magnet 94 both are installed therein. Accordingly, since the bobbin 86 is directly housed in the lower mount 12, this mount 12 serves as a role of yokes, and those of mount 12, coil 84 and bobbin 86 comprise an electromagnet 50. |
