| 摘要 |
<p>A disc drive is provided including a base (10) which includes a first section (12) for mounting the motor that supports and spins the discs, and a second section (14) for mounting the actuator and the carriage that is to carry the transducers towards and away from the disc. The voice coil motor itself consists of two halves (16, 18). Each voice coil motor half is mounted to the base using a flange (24, 26) located between the carriage guide rods (20, 22) on which the carriage will ride. This mounting flange has two attachment points: a first mounting point (48, 50) at the end of the flange farthest from the discs, fixed in all axes; and a second mounting point (42, 46) at the end of the flange closest to the discs that prevents relative movement between the base and voice coil motor in the axes perpendicular to and tangential to the discs, but allows differential expansion along the axis radial to the discs. Since each voice coil motor half is independently mounted to the base, and since each motor half has only one fixed mounting point along any axis, the base is free to thermally expand and contract around the voice coil motor without distorting. Additionally, the carriage guide rods that support the movable carriage must be maintained in precision alignment both with each other and relative to the discs. This is accompanied by mounting the lower carriage guide rod (20) directly to the base (10) with a single screw or other appropriate fastener, and mounting the upper carriage guide rod (22) in a structure (34, 36) made of the same material as the base. Since the carriage guide rods, like the voice coil motor pole pieces, are steel for durability, differential expansion between the guide rods and their support structures is allowed without affecting their positions relative to each other or the discs.</p> |
