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:
Apr. 16, 2002
Filed:
Sep. 21, 2000
Applicant:
Inventors:
Masatoshi Moteki, Shiojiri, JP;
Osamu Takahashi, Matsumoto, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G04B 1/00 ;
U.S. Cl.
CPC ...
G04B 1/00 ;
Abstract
A gap h between a rotor inertia disk and stators and is set so that the load torque between the components due to air viscosity resistance is equal to or less than 1/10 of the maximum output torque at a rotor. Since the load torque is thereby sufficiently reduced, it is possible to limit energy loss of a mainspring, and to extend the period of operation of a timepiece.