Abstract: An electronic timepiece having both an electro-optical time display and time indicating hands, and means for setting both the electro-optical display and the hands to display an identical initial time value and to be thereafter advanced in synchronism with each other.

Abstract: An electronic timepiece having improved means for rapid setting of time, date or alarm time, whereby the number of setting pulses generated for each actuation of an external actuating member is varied depending upon the time intervals between successive actuations.

Abstract: A system for performing frequency division of a high frequency signal by intermittent operation of a frequency dividing counter circuit and by a phase lock loop circuit, in which phase lock is periodically achieved with an output of the counter circuit. Phase lock loop circuit is of novel design which provides exact phase lock without cyclic variations from the reference phase.

Abstract: A portable electronic device including a battery power supply, an oscillator for generating a time base signal, a timing pulse generator for generating timing pulses from said time base signal, shift registers for operations, and a display device for displaying the content of said registers, characterized by the provision of means for initiating and halting the operation of the timing pulse generator without disconnecting the power supply.

Abstract: A circuit for producing a digital output varying linearly with temperature changes by measuring the width of a pulse from a monostable multivibrator, in which the pulse is measured more than twice in succession and the results added. A greater change in the digital output for a given temperature change is achieved, providing higher measurement accuracy.

Abstract: An electronic timepiece includes a frequency supply for providing a relatively high frequency time base signal, a frequency converter responsive to the relatively high frequency time base signal to provide a timing signal, a clock signal, and a time unit signal. A timekeeping circuit is responsive to the time unit signal to provide a time information signal, and at least one of the timing signal, clock signal, and time information signal is chopped into periodic bursts to effect transfer of the at least one of the timing signal, clock signal, and time information signal from one part to another part in the timepiece. The time in response to the time information signal is displayed.

Abstract: A transistor circuit having a plurality of CMOS circuits in which the power circuits of said CMOS circuits constitute a series circuit in which the power source circuits are in series connected to each other and the opposite ends of said series circuit is connected to the opposite ends of an electric battery cell.

Abstract: Drive signals are applied to the segment and digit electrodes of a liquid crystal display device in a time-multiplexed manner by means of a control circuit adapted to control first and second gates the output of one of which is selected as a segment signal by selection means, and further adapted to control a digit signal generating circuit for producing a digit signal that cooperates with the segment signal to drive the display. The effective application of drive signals allows a reduction in the number of segment electrodes and in the quantity of associated wiring so that the degree of integration on an IC chip can be increased.

Abstract: A data transfer circuit consisting of a shift register circuit, which is efficiently applicable to portable electronic devices such as a portable electronic timepiece, electronic computer or the like is disclosed. The circuit comprises a first shift register circuit and a second shift register circuit to which is transferred data from said first shift register circuit. The second shift register circuit includes at least first stage bit whose data transfer is controlled by two phase clocks and another bit whose data transfer is controlled by one phase clock.

Abstract: A portable electronic device equipped with timekeeping and calculation functions, time and calculation data being stored in semistatic shift registers. Time data is circulated once per second through a loop containing two full adders with units of seconds being incremented by one in each circulation by the first adder and digit carry operations performed by the second adder and by a bit set/reset circuit during the same circulation. Units of seconds digit of displayed time data corresponds directly to least significant digit of stored time information.

Abstract: There is disclosed an input circuit for portable electronic devices comprising an exteriorly operable member for delivering an operating signal to a portable electronic device and including a first flip-flop set in synchronism with an edge of said operating signal, a second flip-flop for reading therein said operating signal and a reset signal preparing circuit supplied with an output from said second flip-flop and preparing a reset signal for said first flip-flop.

Abstract: An electronic timepiece comprising a counter circuit adapted to present reference data indicative of an existing year, month, date and day of the week, and operative to count leap years, years, months, dates, and days of the week at a high speed with a preset reference data as a starting point, a register for storing calendar data indicative of a desired year, month, date and day of the week to be determined, a comparator for comparing the content of the counter circuit and the content of the register and generating a coincidence signal when the contents are in agreement, and a controller for halting counting operation of the counter circuit in response to the coincidence signal to cause a display device to display the contents of the counter circuit to obtain an indefinite item concerning calendar.

Abstract: A portable electronic device equipped with a timepiece circuitry, which electronic device comprises a plurality of numeric keys adapted to provide numeric values correponding to 0 through 9 when actuated. The numeric keys are utilized to correct a selected digit and once the numeric keys are actuated to complete a correction of the selected digit a shift will be made from the selected digit to another digit for a correction. The digit to be corrected is identified by a decimal point display segment which is automatically and cyclically shifted.

Abstract: An electronic device having means for display of data in digital form and means for suppression of non-significant zero digits, which comprises storage circuit means for storing and circulating said data, detection circuit means coupled to an output terminal of said storage circuit means for detecting zero value digits in said data, counter circuit means responsive to an output signal from said detection circuit means for counting the number of non-significant zero value digits in said data, and gate circuit means coupled between said storage circuit means and said display means responsive to an output signal of said counter circuit means for suppressing display of said non-significant zero value digits by said display means.

Abstract: A miniature type electronic device having a calculating ability is disclosed. The device comprises an exterior operating member for changing over a calculation enable mode to a calculation disable mode and vice versa and a memory circuit for continuously memorizing a final calculation result when the calculation disable mode is set by the operating member, whereby subsequent calculations can be continued on the basis of the final calculation result when the calculation enable mode is set again by the operating member.

Abstract: An electronic time piece system is comprised of storing means for storing keeping time data and including counter means responsive to timing signals supplied from a synthesizer, circuit means for setting keeping time data in the storing means, and display means for displaying the keeping time data. The electronic time piece system may be coupled with an option system by which the storing means is supplied with additional data.

Abstract: A driver circuit for an electrochromic display device which includes segment electrodes and a common electrode. The driver circuit has a power source, switching means connected between the power source and the segment electrodes, and circuit means disposed between the common electrode and the power source. The circuit means is operative to couple the common electrode to either a positive terminal or a negative terminal of the power source, whereby an electric current will flow through the segment electrodes in bleaching and coloring directions with the use of a single power source.

Abstract: An electronic device equipped with an electrochromic display device adapted to provide a display of information, which comprises a logic circuit arranged to provide a serial data, and a driver circuit composed of a serial/parallel converter to convert the serial data into a parallel data and a plurality of driver means responsive to the parallel data to drive the corresponding segment electrodes of the electrochromic display device in coloring and bleaching directions. The driver circuit may further include a segment selection circuit to enable a selected one of the driver means corresponding to the segment whose display state is to be changed over.

Abstract: A driver circuit for an electrochromic display device for an electronic timepiece. In a first preferred embodiment, drive signals are applied through a plurality of source follower first and second metal oxide semiconductor field effect transistors to segment electrodes of the electrochromic display device. The first and second transistors have source electrodes connected together and also connected to the segment electrode to lower the voltage being applied across the segment electrode and a common electrode to drive the display device at a lower voltage. In a second preferred embodiment, the common electrode of the display device is alternately coupled to the high and low potentials of the battery by means of an inverter circuit composed of source follower transistors, which function to reduce the voltage being applied across the segment electrodes and the common electrode.

Abstract: A digital display timepiece being provided with electro-optical display devices in which when clock information corrected partition marks provided near respective units in a clock information indicator are adapted to flash whereby the numerical figure to be corrected in a display portion can be easily confirmed.