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:
Feb. 10, 1976
Filed:
Mar. 06, 1974
Tomomi Murakami, Tokyo, JA;
Hideyuki Kawashima, Higashikurume, JA;
Citizen Watch Co., Ltd., Tokyo, JA;
Abstract
An electronic timepiece provided with a liquid-crystal cell in a grounded casing, a common electrode on one side thereof and a segmented pattern electrode on the other side has a transparent shield electrode which is grounded to the casing and overlies the major part of the cell, with the exception of at least one window registering with a detecting electrode positioned on the glass cover of the casing. An ungrounded electrode underneath the window is pulsed by the electronic clockwork, the pulses being picked up by the detecting electrode and delivered to an evaluating device for measuring the operating rate of the timepiece. In one embodiment, two such windows associated with respective detecting electrodes are provided, one window registering with the common electrode at a location remote from all the segments of the pattern electrode, the other window being aligned with a coplanar extension of one of the segments of a digital array which is intermittently energized in the course of a pattern-forming cycle; the evaluator distinguishes between periods when the pulses picked up by the detecting electrodes are in phase and in phase opposition.