Abstract: An electronic timepiece is provided with a device for automatically adjusting month-end calendar dates capable of reading dates simply, quickly, and reliably. A date detection pattern 71 composed of reflective and non-reflective sections is formed on the rear surface of a date dial 70. When the date dial 70 rotates, a change in the boundary between the reflective part and the non-reflective part is read by a photo sensor 81, the necessary number of dates is determined by a control circuit 20 by use of a perpetual calendar circuit, driving a date dial driving mechanisms 51 and 52.

Abstract: A data transmitting/receiving system is configured so as to send data to an analog-type watch, without the need to make direct electrical contact thereto and without influencing the drive of the hands of the watch. When a timing signal that is sent from the watch is received, a data transmitting unit performs transmission. The watch does not receive data at other times, and this receiving operation is performed intermittently.

Abstract: An electronic timepiece is provided with a device for automatically adjusting month-end calendar dates capable of reading dates simply, quickly, and reliably.

Abstract: An electronic timepiece is provided with a device for automatically adjusting month-end calendar dates capable of reading dates simply, quickly, and reliably. A date detection pattern 71 composed of reflective and non-reflective sections is formed on the rear surface of a date dial 70. When the date dial 70 rotates, a change in the boundary between the reflective part and the non-reflective part is read by a photo sensor 81, the necessary number of dates is determined by a control circuit 20 by use of a perpetual calendar circuit, driving a date dial driving mechanisms 51 and 52.

Abstract: To provide an electronic watch with calendar without the need to adjust the calendar when the watch is restarted. A control mechanism 133 is provided which uses a signal from a 24-hour switch 12 which operates in synchronism with a time mechanism converter 6 as a signal for operating a date display drive converter 51 during normal watch operation, and uses a signal from a 24-hour counter which receives a signal from a time mechanism circuit 60 as a signal for operating the date display drive converter 51 at other times.

Abstract: A motor driving apparatus including a stepping motor constituted by a stator having at least two poles. The driving apparatus includes a circuit for biasing one terminal of a driving coil of a motor to an intermediate potential of a power supply voltage. A counterelectromotive voltage detection circuit for detecting a counterelectromotive voltage generated upon rotation of a rotor is arranged at the other terminal. A pulse signal to rotate the rotor is output on the basis of a detection signal output from the counterelectromotive voltage detection circuit.

Abstract: A switch (201) is conjoined with a hand driving gear train (107) and provided with at least three or more contact groups (203, 204, 205) turned on at least once in each 24 hours. A calendar indicating member is updated according to an order of closing each contact. The matching between the time indicating and the calendar indicating can be accomplished when a user modifies the time display.

Abstract: An analog-type electronic watch with an electrical generating apparatus, this watch having a load compensation function means, and completing avoiding the adverse influence of magnetic noise which accompanying electrical generation operation. This watch has an electrical generator which operates intermittently, an electrical generation detection means which detects electrical generation by the electrical generator based on a prescribed relationship to the operation of a drive judging means, and a control means which, when the driving judging means detects electrical generation by the electrical generator, supplies a compensation drive pulse to a drive circuit, regardless of the judgment results of the driving judging means.

Abstract: It is an object of this invention to attain reliable starting characteristics and stable rotation performance of a motor in a motor of a phase synchronization driving type.

Abstract: A power supply for electronic timepieces is constituted of a mechanical power generating section (1), a power storing section (30) composed of a large-capacity secondary battery which stores power generated by the section (1), a voltage detecting section (4) which detects the voltage at the section (30), an overcharging preventive section (5) which is controlled by the section (4) and permits the electric current generated by the section (1) to flow therethrough, a diode (2) connected between the sections (1 and 5), and a switching transistor (7) which is connected between the sections (5 and 30), and turned off when the section (5) starts to discharge so as to improve the voltage resistance and charging efficiency.

Abstract: In an electronic watch, a hand wheel gear 109b in a gear train has a tooth 124 having a profile K so as to prevent the backward movement of a hand 104. During initialization, the gear train is rotated backward such that the hand 104 is turned to the backward movement preventing position, which serves as an initializing position, and a reference position during detection of a hand position. Usually, a backward movement command is issued when the hand 104 is supposed to be at the reference position. The hand 104 is judged to be out of the reference position when its backward movement is detected.

Abstract: A power supply unit having a power generation portion 1 and a power storage portion 4 to supply power to an electronic watch 3. The power storage portion is formed by a plurality of cells 41, 42, each having the same capacity and having switches 51, 52 connected in series, a switch 53 is connected in series between the plurality of cells 41, 42, and these switches 51, 52, and 53 are switched by signals from a voltage detector circuit 6. This arrangement reduces initial actuation time and expands the time for which the electronic appliance continues to operate.

Abstract: A data carrier system which uses a power sourceless electromagnetically coupled data carrier, wherein two-way data communication is made possible between a fixed facility and a data carrier. Provision is made for a synchronizing means which renders the frequencies and phases of AC magnetic fields emitted from the fixed facilities to be the same among a plurality of fixed facilities, such that interference will not take place among the plurality of fixed facilities even when they are arranged close to one another. Moreover, the electric power induced in the antenna of the fixed facility by the AC magnetic field generated from the data carrier is synchronously detected by using a synchronizing signal controlled by said synchronizing means.

Abstract: The alarm clock is formed of time indicating hands (3), alarm hands (4), and an alarm setting device (202, 204, 205, and 207); wherein the alarm setting device is provided with an alarm section (200) which works to stop the movement of alarm hands when the alarm setting device is in the alarm-set condition, and works to move the alarm hands in synchronous motion with the time indicating hands when the alarm setting device is in the non-alarm-set condition. This structure allows the wearer to instantly distinguish the alarm-set condition from the non-alarm-set condition.