Citizen Watch Company, Ltd.

Citizen Holdings Company, Ltd.

Takeo Mutoh

Hiroyuki Koike

Haruhiko Higuchi

Yasuo Kitajima

Kenji Shimoda

Takayuki Hasumi

Eiki Murakami

An electronic device such as a watch comprises a solar cell () and window portions () which is located on the solar cell () and through which light is applied to the solar cell (). The solar cell () is divided into a plurality of divided cells such that irradiated portions (A toF) of the divided cells are equal in area, in consideration of the shapes, areas, and number of the window portions () and the number of divisions of the solar cell ().

Electronic device with solar cell

An electronic timepiece has a calendar advancement device resistant to external shock and capable of achieving date correction in a short time. A date dial advancement transducer ( ) is activated in response to a date dial drive signal generated by a 24-hour switch. A date advancement mechanism (a date gear train) ( ) employs a Geneva wheel for stabilizing the date dial ( ). A bounding restraint lever is regulated using an eccentric cam or the like provided coaxially with the Geneva wheel.

Electronic timepiece with calendar device

Electronic timepiece with calendar month-end non-correction device

Electronic watch with calendar

Growing community of inventors

Tokyo, Japan

Takeo Mutoh