Method of manufacturing a disk drive device having base member, bearing unit, drive unit and hub, and disk drive device manufactured by the manufacturing method

Abstract

A method of manufacturing a disk drive device including: assembling a subassembly by fixing at least a bearing unit, a drive unit and a hub to a base member in a first clean room; cleaning the subassembly in a second clean room; and sealing the subassembly by a sealing member. The first clean room and the second clean room are communicated with each other by a communicating opening for transferring the subassembly, and an atmospheric pressure in the second clean room is equal to or higher than that in the first clean room.

1 . A disk drive device, comprising:
 assembling a subassembly by fixing at least a bearing unit, a drive unit and a hub to a base member in a first clean room;   cleaning the subassembly in a second clean room; and   sealing the subassembly by a sealing member,   wherein a communicating opening for transferring the subassembly is provided between the first clean room and the second clean room, and wherein an atmospheric pressure in the second clean room is equal to or higher than that in the first clean room.   
     
     
         2 . The disk drive device of  claim 1 , wherein the subassembly has a circular gap opened outwards between the base member and the hub, and wherein the gap is formed into a shape such that purified water is prevented from entering from the gap when the subassembly is dipped in the purified water. 
     
     
         3 . The disk drive device of  claim 2 , wherein the gap is formed into a tapered shape in which the gap is progressively narrower toward the opened outside. 
     
     
         4 . The disk drive device of  claim 1 , wherein 2000 pieces or fewer of particles having a size equal to or larger than 0.5 μm are present per 1 cm 2 , in the disk drive device.