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:
Jan. 03, 1984
Filed:
Sep. 15, 1982
Fuminori Suzuki, Tanashi, JP;
Citizen Watch Company Limited, Tokyo, JP;
Abstract
An electronic timepiece is provided with a photo-electric cell generating an output voltage indicative of incident illumination levels, circuit means for converting this output voltage into digital data signals, and a liquid crystal display which is driven in response to the data signals such that successive sections of the display act to progressively unmask a rear reflector plate to thereby indicate the illumination level. The circuits for converting illumination level to data signals are based on an oscillator circuit whose frequency is controlled by the photo-electric cell voltage, and digital means for measuring this frequency, so that the circuit configuration is very simple and power comsumption extremely low.