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:
Nov. 02, 2010
Filed:
Nov. 08, 2007
Yuzuru Suzuki, Kitasaku-gun, JP;
Takayuki Yamawaki, Kitasaku-gun, JP;
Hiroyuki Furusaki, Kitasaku-gun, JP;
Masaki Kagawa, Kitasaku-gun, JP;
Yuzuru Suzuki, Kitasaku-gun, JP;
Takayuki Yamawaki, Kitasaku-gun, JP;
Hiroyuki Furusaki, Kitasaku-gun, JP;
Masaki Kagawa, Kitasaku-gun, JP;
Minebea Co., Ltd., Nagano, JP;
Abstract
A stepping motor includes: a stator which includes a cup-like first (outer) yoke having a plurality of notches formed at its bottom plate, a second (inner) yoke, and a bobbin having a coil wound therearound and housed in the annular hollow space formed by the first and second yokes; and a pair of bearings each of which includes a hollow-cylindrical main body and a flange structure having a plurality of protrusions, and is attached to the stator such that the protrusions engage with the notches of the first yoke thereby preventing the bearing from rotating relative to the first yoke, and such that the protrusions make contact with a flange of the bobbin thereby precisely positioning the bearing relative to the first yoke with respect to the axial direction, which prohibits any portions of the bearing from protruding axially outwardly beyond the bottom plate of the first yoke.