Other

Citizen Watch Company, Ltd.

Kunihiro Daigo

Hiroshi Ogawa

Minoru Natori

Toshikazu Hatuse

Tadahiko Nakagiri

Toshiaki Oguchi

Toshikazu Shimazaki

Shigeru Morokawa

Singo Ichikawa

Hisao Yamagata

Ryo Namiki

Yoshinobu Kashima

Kouhei Kawanobe

An electronic calculator watch which comprises timekeeping means composed of an oscillator, a frequency divider connected to the oscillator, a counter circuit connected to the frequency divider, and a driver circuit connected to the counter circuit for providing an output signal indicative of time information, and calculating means composed of an oscillator circuit and a calculation circuit responsive to perform calculations under control of numerical inputs furnished by external operation device provided on a watch case. The watch also comprises a display including a first display section connected to the driver circuit of the timekeeping means to display the output signal delivered therefrom, and a second display section connected to the calculating means to display the result of calculations, each of the first and second display sections having a plurality of digit electrodes and a plurality of segment electrodes arranged in a matrix configuration.

Electronic calculator watch

A booster circuit for an electronic timepiece having a power supply and a display device adapted to be driven in a matrix driving mode, which comprises a Cockcroft circuit connected to one terminal of the power supply to provide a plurality of boosted output voltages to the display device and voltage compensating means connected to the other terminal of the power supply to compensate for voltage drops caused by said Cockcroft circuit.

Booster circuit for electronic timepiece

Growing community of inventors

Higashiyamato, Japan

Kunihiro Daigo