Production method of disk drive device for cleaning subassemblies and disk drive device produced by said production method

1. A production method of a disk drive device comprising:

an assembling process to assemble a subassembly by incorporating at least a bearing unit in a hub in a clean room;

a pouring process to pour a lubricant in the bearing unit;

a cleaning-liquid discharging process to discharge a cleaning liquid onto the hub;

a cleaning-liquid intake process to in-take the cleaning liquid discharged onto the hub, wherein an inlet port for the cleaning liquid is arranged pointedly in a predetermined position of the hub and the cleaning liquid is taken in through the inlet port in the cleaning-liquid intake process; and

a sealing process to seal the subassembly inside a seal-material.

2. The production method of a disk drive device according to claim 1 , wherein the hub is rotated when the cleaning liquid is discharged in the cleaning-liquid discharging process.

3. The production method of a disk drive device according to claim 2 , wherein the rotating speed of the hub when the cleaning liquid is discharged is at least 100 r/m and at most a preset rotating speed during the practical operation of the disk drive device in the cleaning-liquid discharging process.

4. The production method of a disk drive device according to claim 1 , wherein the hub is in a tilted state when the cleaning liquid is discharged in the cleaning-liquid discharging process.

5. The production method of a disk drive device according to claim 4 , wherein the inclination angle of the hub is at least 5 degrees and at most 45 degrees in the cleaning-liquid discharging process.

6. The production method of a disk drive device according to claim 1 , wherein the cleaning liquid is discharged so that the cleaning liquid reaches at least an area of the hub with which a recording disk comes into contact when the recording disk is mounted on the hub in the cleaning-liquid discharging process.

7. The production method of a disk drive device according to claim 1 , wherein a discharge port for the cleaning liquid is arranged pointedly in a predetermined position of the hub and the cleaning liquid is discharged through the discharge port in the cleaning-liquid discharging process.

8. The production method of a disk drive device according to claim 1 , wherein the hub is vibrated in the cleaning-liquid discharging process.

9. The production method of a disk drive device according to claim 1 , wherein the inlet port is within a range of approximately 120 degrees from a discharge port used as a reference in a rotational direction of the hub, in the cleaning-liquid intake process.

10. The production method of a disk drive device according to claim 1 further comprising, after the cleaning-liquid discharging process, a process to spray air onto the subassembly.

11. The production method of a disk drive device according to claim 10 , wherein an impact of at least 100 G and at most 200 G is applied to the subassembly in the process of spraying air.

12. The production method of a disk drive device according to claim 1 further comprising a process to count the number of particles attached to the disk drive device.

13. The production method of a disk drive device according to claim 1 further comprising, between the cleaning-liquid intake process and the sealing process, a drying process to dry the subassembly while heating the subassembly.

14. The production method of a disk drive device according to claim 13 , wherein the subassembly is put in a high-temperature chamber whose internal temperature is kept between 60 and 120 degrees Celsius in the drying process.

15. The production method of a disk drive device according to claim 13 , wherein a period in which the subassembly is kept in the high-temperature chamber is at least 60 minutes and at most 180 minutes in the drying process.

16. The production method of a disk drive device according to claim 1 comprising, between the cleaning-liquid intake process and the sealing process, an air-leakage checking process to check whether there is any air leakage in a seal area of the subassembly.

17. The production method of a disk drive device according to claim 16 , wherein a predetermined space defined by the subassembly and a space defining member is filled with a gas containing helium, whose atmospheric pressure is higher than a predetermined atmospheric pressure, and wherein the speed of a decrease in the atmospheric pressure in the predetermined space is detected so as to check whether there is any air leakage in the subassembly based on the detected speed of a decrease in the atmospheric pressure, in the air-leakage checking process.

18. The production method of a disk drive device according to claim 1 , wherein the boiling point of the cleaning liquid is at least 40 degrees Celsius and at most 90 degrees Celsius under atmospheric pressure in the cleaning-liquid intake process.

19. A production method of a disk drive device comprising:

an assembling process to assemble a subassembly by incorporating at least a bearing unit in a hub in a clean room;

a pouring process to pour a lubricant in the bearing unit;

a cleaning-liquid discharging process to discharge a cleaning liquid onto the hub from a discharge port;

a cleaning-liquid intake process to intake the cleaning liquid discharged onto the hub, wherein the hub is rotated when the cleaning liquid is discharged in the cleaning-liquid discharging process, such that the cleaning liquid moves toward an inlet port during the cleaning-liquid intake process; and

a sealing process to seal the subassembly inside a seal-material.