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:
Sep. 01, 2009
Filed:
Sep. 22, 2005
Yoshihiro Ito, Saitama, JP;
Yoji Naka, Saitama, JP;
Takehiko Senba, Saitama, JP;
Haruo Onozuka, Saitama, JP;
Mitsuo Manabe, Saitama, JP;
Yoshihiro Ito, Saitama, JP;
Yoji Naka, Saitama, JP;
Takehiko Senba, Saitama, JP;
Haruo Onozuka, Saitama, JP;
Mitsuo Manabe, Saitama, JP;
Fujinon Corporation, Saitama, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
A stepping motor comprises first to third coil portions and first to second rotors. The first rotor has a cylindrical shape and a circumferential surface thereof is magnetically-polarized so as to alternately arrange south poles and north poles. The first rotor is disposed inside the first and second coil portions, and is rotated by magnetic fields generated at a time when the first and second coil portions are energized. The second rotor has a disk shape and a surface thereof is magnetically polarized so as to alternately arrange south poles and north poles. The second rotor is disposed such that edge areas of both surfaces thereof are interposed between the second and third coil portions. The second rotor is rotated by magnetic fields generated at a time when the second and third coil portions are energized.