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. 07, 2012
Filed:
Nov. 28, 2007
Bao-hua Liang, Shenzhen, CN;
Yong-kang Zhang, Shenzhen, CN;
Jian-feng Yan, Shenzhen, CN;
Ying-min Huang, Taipei Hsien, TW;
Bao-Hua Liang, Shenzhen, CN;
Yong-Kang Zhang, Shenzhen, CN;
Jian-Feng Yan, Shenzhen, CN;
Ying-Min Huang, Taipei Hsien, TW;
Fu Zhun Precision Industry (Shen Zhen) Co., Ltd., Shenzhen, Guangdong Province, CN;
Foxconn Technology Co., Ltd., Tu-Cheng, New Taipei, TW;
Abstract
A cooling fan includes a fan housing () having a central tube () extending upwardly therefrom, a bearing () being received in the central tube, a stator () being mounted around the central tube, and a rotor () having a shaft () extending through the bearing. At least one notch () is defined in an end of the shaft. A balance structure () is mounted around the shaft, and has a portion facing and surrounding an upper portion of the at least one notch of the shaft. The balance structure is made of magnetic material, which can attract the shaft downward to thereby counter the upward force generated by the rotor when it is driven to rotate. Accordingly, the noise problem incurred by the floating of the rotating rotor can be resolved by the present invention.