Citizen Watch Company, Ltd.

Hideo Uehara

Masato Yamada

Toshio Umemoto

Toshio Hiruta

Kunikazu Mochida

Mamoru Shibata

Clock with constellation display

An electronic diving wristwatch having a pressure sensing depth meter provided in a projection on a case of the watch without interferring with the existing crown, pushbuttons, etc. The depth meter has a piezoelectric type sensing element which produces electrical output in response to the water pressure. The output is converted to a water depth which is displayed in a digital display window of the watch.

Wristwatch with pressure sensor

A wristwatch with a star map disk rotatably mounted in a caser and a gear train for rotating the star map disk at a speed of one revolution per one sidereal day. A star map is provided on the star map disk. The star map includes bright and constellation figures in a part of the celestial sphere which are selected from visible stars. The dial of the wristwatch has an opening for defining a range of the star map which is visible when observing.

Timepiece having a star display

Growing community of inventors

Sayama, Japan

Hideo Uehara