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. 16, 2004
Filed:
Feb. 20, 2002
Seiko Epson Corporation, Tokyo, JP;
Abstract
To provide an electronic unit which can prevent brake control from stopping a generator. An electronically controlled mechanical timepiece, which is an electronic unit, includes a generator driven by a coil spring to generate electric power, and a rotation control unit driven by electric energy of the generator to control the rotation period of the generator . The rotation control unit is provided with a brake control unit for comparing a reference signal fs with a rotation-detection signal FG corresponding to the rotation period of the generator to apply brake control to the generator , and a generator-stop preventing unit for setting the amount of brake to be applied to the generator to a first brake setting value to prevent the generator from being stopped, when the rotation period of the generator is equal to or longer than a first setting period which is longer than a reference period. When the rotation period of the generator becomes long, the generator is controlled by the first brake setting value. The first brake setting value is a small amount of braking, such as zero, and can prevent the generator from being stopped.