| 摘要 |
PROBLEM TO BE SOLVED: To damp oscillation by sliding friction when a supporting piece slides, and improve the rotational speed of a disk and the head speed, by adjusting the spring constant, the quantity of flection of a leaf spring of a collision damper unit, and the surface roughness of a sliding contact surface. SOLUTION: A collision damper unit 10 is provided to protrude in parallel along a focusing direction with respect to a supporting piece 2b of a body portion 2a. A leaf spring of this collision damper unit 10 is inclined toward a free end from the proximal end. As a free end portion 10a flexes to be pressurized to the supporting piece 2b, the free end portion 10a is constantly abutted against the supporting piece 2b. By adjusting the spring constant, the quantity of flection of the leaf spring of the collision damper unit 10, and the surface roughness of a sliding contact surface, the sliding resistance of the supporting piece 2b at the time of oscillation is set. When the supporting piece 2b oscillates in the focusing direction at the time of operation, sliding friction is generated between the supporting piece 2b and the collision damper unit 10. Thus, the oscillation of the supporting piece 2b is damped, and the rotational speed of a disk and the head speed may be improved. |
