Disk drive apparatus

Abstract

Abstract A disk drive apparatus having a thick and simple structure with manufactured at low cost, and a bearing device having a thick structure, whose shaft deflection is small, and which is high in vibration and impact strength, and manufactured at low cost. The disk drive apparatus comprises a stator provided on a metal based printed circuit board, a shaft supported by a bearing device which is securely fixed by an attaching means of the stator, with the shaft being assembled with a magnet, a rotor yoke and the like. With this structure, the number of component parts can be decreased, and since a die therefor is not necessary, the cost for manufacturing it can be eliminated. Therefore, the disk drive apparatus is advantageous in manufacture. The bearing device for supporting a shaft through lubricating oil comprises a bearing body having at least one groove on an inner peripheral surface and grooves formed on both sides thereof with a smaller depth than the groove a thrust receiving portion provided at the bottom of the bearing body, and at least one vent hole. With this structure, the bearing device can be reduced in thickness without a metal bush and a ball bearing. Also, owing to the pumping effect of the shaft, the grooves and the lubricating oil, a film of the lubricating oil is formed around the shaft so that the shaft deflection can be suppressed.

Inventors

• 👤 Kaoru Konishikawa

Bibliographic Details