Citizen Watch Company, Ltd.

Citizen Holdings Company, Ltd.

Kiyotaka Igarashi

Kenji Fujita

Masahiro Sase

Akiyoshi Murakami

Kenji Shimoda

Isamu Kobayashi

Noritoshi Suzuki

Shigeru Morokawa

Haruhiko Higuchi

Masami Fukuda

Kenji Miyasaka

Ryoji Iwakura

Masao Sakuyama

Fumio Kanno

Takashi Osa

Shinichi Komine

Kunikazu Mochida

Kohichi Satoh

In an electronic watch having an electrical generation means, an electrical power storage means which stores electrical energy generated by the electrical generation means, an oscillator circuit, a control section which operates in response to a clock of the oscillator circuit, and a display section which is controlled by the control section, and which displays the time and also selectively displays a function other than the time, a voltage detection means which detects the voltage of the electrical power storage means and a control section management means which, in response to a detection signal from the voltage detection means controls the operation of the control section are provided, and hysteresis is provided between the operation starting point and operation ending point of the control section, which control such operations as storage of hand positions.

Electronic watch

An electric watch is characterized by including a transmitting circuitfor generating a plurality of transmitted signals, transmitting electrodesandfor outputting the output signals generated by the transmitting circuit, a signal modulating membercomposed of a rotor arranged adjacently to the transmitting electrodesandin a non-contact manner for modulating the transmitted signals, a receiving electrodearranged adjacently to the signal modulating memberin a non-contact manner for receiving the transmitted signals modulated by the signal modulating member, a receiving circuitfor amplifying received signals received by the receiving electrode, and a detecting circuitfor detecting mechanical position information of the signal modulating memberbased on the received signal amplified by the receiving circuit

Electric timepiece

An electronic timepiece () comprises time information generating unit (A) for generating time information, information generating unit for generating information (function information, warning information, etc.) other than the time information, and power-saving operation unit (D) for operating the electronic timepiece in a power-saving operation state entailing lower power consumption than in a normal operation state. The information generating unit or the power-saving operation unit (D) is operated preferentially.

Electronic watch and electronic watch control method

When an external switch means ( ) is operated, a setting means ( ) receives an output signal G therefrom and outputs setting signals S for varying the internal resistance of an adjusting means ( ). When the internal resistance of the adjusting means ( ) is varied, the potential (voltage value) at point A of the input value to a sensing means ( ) is varied because it is the product of the generation quantity (current) of a power generating means ( ) and the internal resistance. When the potential at point A exceeds a threshold value (H), the sensing means ( ) outputs a sensing signal K of L level. When the sensing signal K of L level is outputted, the operation of the electronic timepiece changes to a power save mode where the drive of the second hand is stopped, for example. Thus the operation of the electronic timepiece changes to a power save mode when the power generation level of the power generating means ( ) is equal to or lower than a specified level. Illumination by external light in the power save mode can be made constant even if the transmittance of the dial is different by adjusting the resistance of the adjusting means ( ).

Electronic clock

A multifunction electronic watch having a large variety of added functions, and providing an electronic watch and drive method therefor that have a high value as a product and a configuration enabling separate use of an energy-saving mode and a function information operating mode, this electronic watch having a reference signal generation means , a time information generation means , which generates time information TJ based on a reference signal S R from the reference signal generation means , a function information generation means for generating function information FJ, a display drive means , which outputs drive signals DRT and DRF for the purpose of displaying the function information FJ and the time information TJ on an appropriate display means, and a display means , which displays the function information FJ and the time information TJ based on the drive signals DRT and DRF from the display drive means , this electronic watch having an energy-saving operating condition with a power consumption that is less than an normal operating condition, wherein the function operating condition of the function information generation means is given priority over the energy-saving operating condition.

Electronic watch and drive method therefor

To provide a hand display-type electronic timepiece which is simply constructed, enables the manufacturer or the user of the analog electronic timepiece to easily and correctly accomplish synchronism between the hands and the timing counter, and does not require an operation for bringing the hands and the timing counter into synchronism when the cell is renewed by the user, eliminating the problems inherent in the aforementioned prior art. That is, in a hand display-type electronic timepiece 1 constituted by a cell 2, a time signal generating means 10, a motor drive control means 25, a pulse motor drive means 17, a pulse motor 18, hands 19 driven by the pulse motor, and a hand position data generating means 3 which generates hand position data corresponding to the hands, and in which the drive control of the hands is executed according to the data from the hand position data generating means 3, an analog hand display-type electronic timepiece further comprises a hand drive stop means 11 which stops the hands 19 and the hand position data generating means 3 under the condition in which synchronism is maintained therebetween, a nonvolatile memory 4 for storing hand position data generated from the hand position data generating means 3, a hand drive data control means 5 which controls the nonvolatile memory 4 and the hand drive stop means 11, and a data storage instruction means 6 which operates the control means 5, wherein in response to an instruction signal from the data storage instruction means 6, the hand drive stop means 11 stops the hands 19, and the hand drive data control means 5 writes the data stored in the hand position data generating means 3 into the nonvolatile memory 4.

Hand display-type electronic timepiece

Rechargeable electronic apparatus

Electronic watch provided with an electrical generator

Electronic timepiece with power generating function

A world watch has an hour hand and a minute hand for usual time indication, a plurality of symbols disposed on a dial to represent areas having respective time differences, an area including hand for specifying one of the areas by indicating one of the symbols, a local time indicating hand for indicating the local time of the specified area at least in hours, and a date indicating hand for indicating a date of the specified area. The world watch comprises counters for counting the numbers of driving signals used for driving the area indicating hand and local time indicating hand, respectively; and a drive controlling circuit for generating, when the count of at least one of the counters reaches a predetermined value, a driving signal for driving the date indicating hand in a normal or reverse turning direction based on a judgment whether the predetermined value has been described by an increase in the count or by a decrease in the count. With this arrangement, the standard time and date of an optical area are correctly and easily displayed.

Analog world watch

Growing community of inventors

Tokyo, Japan

Kiyotaka Igarashi