Patent ID: 7009817

Claim:
A rotary magnetic head device comprising: a stationary drum; a rotary drum having a rotary magnetic head, a through hole and bearing attaching portions concentrically formed at an upper and a lower position of the rotary drum, the rotary drum being arranged at an upper side of the stationary drum; a support shaft for pivotally supporting the rotary drum, accommodated in the through-hole, having a receiving face on an upper end face thereof; a radial bearing composed of a fluid bearing interposed between the support shaft and the rotary drum; a rotor of a motor fixed to the rotary drum; a thrust bearing composed of a fluid bearing for receiving a thrust load, the thrust bearing being fixed to the rotor, the thrust bearing being slidably set on the receiving face in an upper portion of the through-hole; a spacer for adjusting a height level of the rotary magnetic head, the spacer being interposed between the thrust bearing and the rotor; a support body vertically arranged at the back of the stationary drum; an attaching member fixed to an upper end portion of the support body with attaching screws, the attaching member being arranged at a predetermined position in an upper portion of the rotary drum; a stator of the motor, attached to the attaching member; a wiring board necessary for motor control, attached to the attaching member; a pressing member attached to the attaching member being capable of moving upward and downward, the pressing member being slidably put on the rotor; and a coil spring interposed between the pressing member and the attaching member, the coil spring pushing the rotary drum downward via the pressing member and the rotor so as to press the thrust bearing downward against the receiving face, wherein the radial bearing is composed of two oil impregnated powder sintered radial bearings which are respectively press-fitted into the bearing attaching portions, and these radial bearings are engaged with the upper and the lower position of the support shaft being capable of freely sliding in the axial direction and freely rotating in the circumferential direction.