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:
Mar. 27, 2007
Filed:
May. 24, 2005
Masato Hata, Shizuoka, JP;
Yazuru Suzuki, Shizuoka, JP;
Atsushi Fukushima, Shizuoka, JP;
Naoyuki Harada, Shizuoka, JP;
Masato Hata, Shizuoka, JP;
Yazuru Suzuki, Shizuoka, JP;
Atsushi Fukushima, Shizuoka, JP;
Naoyuki Harada, Shizuoka, JP;
Minebea Co., Ltd., Kitasaku-gun, JP;
Abstract
There is provided a stepping motor comprising: a stator assembly; a rotor assembly rotatably disposed inside the stator assembly, and including a rotary shaft rotatably supported by bearings, a sleeve fixedly attached onto the rotary shaft, and at least one magnet disposed outside the sleeve; and a preloading mechanism disposed between the sleeve and one of the bearings, and including a coil spring, and a spring holder which is composed of an outer case shaped in a cup-like configuration and an inner case shaped in a cup-like configuration, and which is adapted to house the coil spring. In the stepping motor described above, the spring holder of the preloading mechanism is formed of reinforced polyamide resin, and a washer member having a high sliladability is disposed between the preloading mechanism and the one bearing.