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:
Jul. 07, 1987
Filed:
Jun. 20, 1986
Shigeru Shimozono, Tokyo, JP;
Seikosha Co., Ltd., Tokyo, JP;
Abstract
A stepping motor for use in a clock includes a rod core having an effective length L, and a coil wound around the rod core along the effective length L and having a thickness R defined between the center of the rod core and the outermost periphery of the coil. The effective length L and the thickness R satisfy the relation 10.ltoreq.L/R.ltoreq.40. A stator is magnetically connected between the ends of the rod core. A rotor is rotatably disposed between opposed magnetic poles of the stator, and the rotor has a circular shape of a radius r.sub.0 in the range of 1 to 2 mm. Electric pulses having a pulse width t in the range of 9 to 17mS are applied to the coil so that the stepping motor converts more than 20% of the electric energy of the pulses into rotational torque of the rotor.