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:
Sep. 02, 1980
Filed:
Mar. 02, 1978
Singo Ichikawa, Sayama, JP;
Yoshiaki Kato, Higashimurayama, JP;
Citizen Watch Company, Limited, Tokyo, JP;
Abstract
An electronic timepiece equipped with a battery life warning system, in which an output voltage of a battery are detected under a heavy load condition and a light load condition. In a first preferred embodiment, a time indicating means effects a display of time in a first predetermined more to provide an initial warning of the battery life when the output voltage drops below a first predetermined level during the heavy load condition and also effects of the display of time in a second predetermined mode to provide a second warning of the battery life when the output voltage of the battery drops below a second predetermined level lower than the first predetermined level. In a second preferred embodiment, when the output voltage of the battery drops below the first predetermined level, a drive signal for driving the time indicating means is produced so as to drive the time indicating means with a sufficient driving energy substantially equal to that of a drive signal being produced when there is no voltage drop in the battery. When the output voltage of the battery drops below the second predetermined level, a control signal is applied to the time indicating means, which is consequently rendered to display the time information in a modulated form for thereby providing a warning of the battery life.