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:
Dec. 05, 2000
Filed:
Sep. 23, 1998
Hirohisa Ohta, Tokyo, JP;
Tetsuji Kondo, Tokyo, JP;
Takeshi Sugiyama, Tokyo, JP;
Chiaki Sugano, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A step motor is provided that makes it possible to lower the manufacturing cost and accurately control the movement of a holder. The step motor is provided with: a motor case (3); a hollow columnar stator (4) which is provided inside the motor case (3) and which generates a magnetic field; a rotor (42) which is rotatably provided in the stator (4) and which rotates in steps according to the generated magnetic field of the stator (4); an actuating shaft (43) which is fixed to the rotor (42) and which has a threaded portion (53) at one end thereof; a holder (45) which is threadably engaged with the threaded portion (53) and which is movable in the axial direction; and a guide (44) which is fixed to the motor case (3), which prevents the rotational motion of the holder (45), and which guides the holder (45) to move in the axial direction.