Citizen Watch Company, Ltd.

Citizen Holdings Company, Ltd.

Takayuki Hasumi

Shinichi Yamada

Kenji Shimoda

Yasuo Kitajima

Masahiro Kasaya

Masaaki Namekawa

Kenji Miyasaka

Isao Kitazawa

Takeo Mutoh

Takuji Ike

Takayuki Uchida

Moto Yamashita

Teruhiko Fujii

Eiki Murakami

Kazuhide Kinoshita

A radio-controlled timepiece includes an antenna receiving a standard radio wave and a plurality of motors driving indicator portions which indicate information. A fourth motor which is driven at a lowest frequency during the standard radio wave reception of the antenna is disposed closer to the antenna than the rest of the motors.

Radio-controlled timepiece

An analog electronic watch of the present invention includes: a display unit () for displaying time with a position of a hand; a stepper motor () for driving the hand; a motor drive unit () for controlling driving of the stepper motor at a predetermined hand drive cycle at normal time; hand position detection means () for detecting a position of the hand; a hand position detection means control unit () for intermittently controlling driving of the hand position detection means () at a first detection cycle which is longer than the hand drive cycle; and a detection cycle changing unit () for instructing the hand position detection means () to change the detection cycle. When detecting a predetermined detection cycle changing condition, the detection cycle changing unit () changes a cycle at which the hand position detection means () detects a position of the hand, from the first detection cycle to a second detection cycle, while maintaining the hand drive cycle at which the stepper motor () drives the hand.

Analog electronic watch

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 inexpensive switch connecting structure is provided capable of avoiding abnormal wear-off or deformation of a contact spring of a supporting plate even if a movement in a basic shape is placed in a timepiece case having a shape different from the movement and a push button is repeatedly used. The switch connecting structure includes a supporting plate attached to cap a movement of a timepiece and provided with a contact spring having a contact portion at a tip brought into contact with a switch contact portion of a circuit board, and a switch regulating plate provided with a switch spring on an outer periphery corresponding to said contact spring and covering at least part of said supporting plate, wherein said switch spring is flexed by operation of an externally operated component attached to a timepiece case, thereby bringing the contact portion of the contact spring of said supporting plate into contact with the switch contact portion of said circuit board. The switch spring of the switch regulating plate acts as an intermediary to properly convey the pressing force from the externally operated component such as a push button attached to the timepiece case having a different shape from the basic shape of the movement.

Switch connecting structure for timepiece

A self-winding electric power generation watch capable of having an additional function structure besides a time indication and an electric power generation function by virtue of an efficient arrangement of train wheels and motors for watch, electric power generation, and additional function in a watch case. An electric power generation motor,for conducting self-winding electric power generation by means of rotation of a rotary weight,, a watch motor,driven by electric power of the electric power generation motor,, a storage battery,for storing the electric power of the electric power generation motor,, and a chronograph motor,driven by the electric power of the electric power generation motor,are arranged in a watch case so as to surround a center part of the watch. Watch train wheels,and,, an electric power generation train wheel,, and a chronograph train wheel,are disposed in a two-layer form in a region surrounded by the motors.

Self-winding electric power generation watch with additional function

A watch has a watch case and a module mounted in the watch case. A dial of the watch is welded to the watch case, and a shield is also welded to the dial for shielding the dial.

Watch with extended dial

A watch has a watch case, a module mounted in the watch case, a dial secured to the watch case, and a shield for shielding the dial. The dial has an extending portion outwardly extending from the dial. The dial is secured to the watch case, and the shield is secured to the dial.

Growing community of inventors

Niiza, Japan

Takayuki Hasumi