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. 20, 2010
Filed:
Nov. 29, 2004
Isao Kitazawa, Tokyo, JP;
Akiyoshi Murakami, Ageo, JP;
Haruhiko Higuchi, Tokorozawa, JP;
Citizen Holdings Co., Ltd., Tokyo, JP;
Abstract
Impact detecting resistors (), () of an impact detecting circuit () detect a counter electromotive force of a step motor () generated due to an impact. This counter electromotive force is amplified applying a predetermined period and a predetermined chopper-width by a chopper-amplifying waveform shaping circuit (). Therefore, even a light impact can be detected. Inverters (), () compare these impact detecting signals (S), (S) with a threshold value and detect an impact when the signals exceeds the threshold value. A controlling circuit () provides a lock pulse to the step motor () through signal lines (AA), (BB) when an impact is detected, brakes rotation of a rotor () thereby preventing a deviation of the time displayed with a second hand ().