The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 09, 1994
Filed:
Jun. 23, 1992
Kaoru Konishikawa, Hanamaki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
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.