| 摘要 |
PURPOSE:To make operation confirming inspection possible by using a positioning motor only and, at the same time, to make assembling work of a head positioning device easy, by fitting the positioning motor to the head positioning device as a unit. CONSTITUTION:A magnet block 7 which is magnetized in the axial direction is fixed to a casing 4 and a rotor coil block 8 is fixed to a revolving shaft 1 with clearance between the magnet block 7 and rotor coil block 8 in the axial direction. Moreover, a back yoke 5 made of a magnetic metal, such as pure iron, etc., is provided with a clearance between the rotor coil block 8 and the back yoke 5 in the axial direction. The back yoke 5 is magnetically coupled with the casing yoke 4 and mechanically coupled with a photo-casing 6 by means of a screw 16. |
