| 摘要 |
PURPOSE:To attain the correction of the temperature off-track of a magnetic head by attaching a structure member having a linear expansion coefficient different from that of an arm to this arm and to provide bimetal function. CONSTITUTION:Arms 2a-2e are formed with prescribed spaces to a frame 2 fixed to a shaft 1, and a magnetic head 3 is fixed to these arms via a pressure spring 7. When a coil 4 is energized, the arms 2a-2e are turned round the shaft 1 to shift the head 3 in the radius direction of a magnetic disk 5. A structure member 6 having a linear expansion coefficient different from that of the arms is attached to the surface of each arm. This member 6 functions as a bimetal. Thus a position change (shown by chain lines) of the arm 2a can be corrected as shown by the solid lines owing to said bimetal function even in case a relative change of position is produced between the disk 5 and the arm 2a due to the ambient temperature change. |
