Citizen Watch Company, Ltd.

Yasuaki Nakayama

Makoto Yoshida

Yasuo Kamiyama

Masamichi Yamauchi

Yoshinobu Kashima

Ryuzo Tanaka

Yoshiro Hirai

Shigeru Aoyama

Kunio Tanai

A correction system for a hands display type of electronic timepiece which can display a plurality of types of time information such as an alarm time and the current time by a single set of hands, with changeover between display of the different types of information being performed by rapid rotation of the hands, with the system being characterized in that means are provided for inhibiting any input of correction signals by external switch actuations while such changeover is in progress. Errors resulting from accidental switch actuations during display changeover are thereby effectively eliminated.

Correction system for hands display type of electronic timepiece

A movement construction of a thin, quartz wristwatch with the movement having a thickness less than 2.5 mm, in which a flat coil is adopted as the driving coil of a stepping motor, and a wheel train is disposed in an approximate concentric relationship with said coil.

Watch movement construction

A watch movement construction has a time dial and a base plate having its one surface fixedly supporting the time dial and including a central region and first and second marginal regions. A wheel train mechanism is disposed in the central region of said base plate substantially in the same plane as the base plate. An electro-mechanical transducer is disposed in the first marginal region of the base plate substantially in the same plane as the wheel train mechanism. An electronic circuit section includes a circuit substrate and a plurality of electronic components disposed in the second marginal region of the base plate substantially in the same plane as the wheel train mechanism and the electro-mechanical transducer.

A battery construction having a cup member and a cap member fixedly held by the cup member. A cup-shaped separator is disposed between the cup member and the cap member, to provide first and second compartments to accommodate a positive active material and a negative active material. The cup-shaped separator has a radial wall intervening between the first and second compartments, an axial wall integral with the radial wall, and a flange portion compressed between a sealing member and the cup member.

Battery construction

A watch movement construction, in which a circuit board is mounted on one surface of a base plate and has a cutout formed at a position near an outer circumference of the movement construction to accommodate a battery in a position such that a circumferential periphery of the battery is partially aligned with the outer circumference of the movement construction whereas a calendar display member is disposed between another surface of the base plate and a time dial at a position displaced from a central portion of the base plate so that a line passing through a center of the battery, a center of the base plate and a center of the calendar display member makes an obtuse angle whereby the calendar display member and the battery are substantially not in an overlapping state thereby to reduce the thickness of the movement construction.

A compact electronic timepiece structure for a timepiece having an analog type display wherein the electromechanical transducer for the display and the circuit board for the electronics of the timepiece are combined into a single joint structure. The joint structure comprises an arcuous coil member wound on an insulative bobbin, a circuit board for supporting the electronic components and electrical interconnects between the components, a plurality of holes in the circuit board, and a plurality of thermoplastic fastening means extending through the holes of the circuit board and fastening the bobbin to the circuit board.

Electronic timepiece structure

A dial attaching device for use in watches with a movement holder ring functioning as a member for fixing a foot of a dial to a base plate and as a member for connecting the base plate to a watch case. The movement holder ring is made of synthetic resin and completely fixes the foot of the dial to the base plate therethrough by characteristics of synthetic resin.

Dial attaching device for watch

A rotor assembly for an electro-mechanical transducer of an electronic timepiece, in which a metallic protecting member is fixedly mounted on a rotary shaft. A rare earth magnet is fixedly supported at its outer periphery by the metallic protecting member.

Rotor assembly for electro-mechanical transducer of electronic timepiece

An electronic watch having an illuminating time display is provided with a switch for controlling the illumination which is operable controlled movement of the arm on which the watch is carried. A closed casing in the watch is provided with electrical contacts and a ball which will engage the contacts to close the watch upon predetermined movement of the arm.

Growing community of inventors

Hanno, Japan

Yasuaki Nakayama