Abstract: An integrated circuit device having a combined time-keeping mode and calculator mode comprises a generator stage for generating basic clock signals and system clock signals, a processor stage responsive to a supply of the system clock signals for executing arithmetic operations required for the timekeeping mode and the calculator mode key input members for introducing information into the processor stage as key input signals, and a clock control for controlling the supply of the system clock signals. The processor stage is adapted to develop a command signal to indicate the completion of the arithmetic operations. The clock control is responsive to the rising and trailing edges of the key input signals for enabling the supply of the system clock signals. The generation of the command signal causes the clock control to prevent the system clock signals from being fed to the processor stage.

Abstract: In an electronic calculator essentially comprising a multidigit display, a keyboard and a data processor unit, a multidigit liquid crystal display is deposited together with integral key actuators of the keyboard of a flexible circuit film which carries electrical conductor leaves in a desired pattern. The conductor leaves to be in contact with terminals of the liquid crystal display are formed to extend in the direction of length of the liquid crystal display to thereby establish room for a battery compartment.

Abstract: A programmable synthetic-speech calculator or micro computer operable in either a normal calculation mode or a program mode releases a sound in response to actuation of keys on a keyboard only when the calculator operates in the program mode.

Abstract: The body of an electronic calculator comprising a keyboard, an arithmetic processor unit, a power supply and a digital display is accommodated within a casing at least a portion of which corresponding to the keyboard is made of a single flexible flat sheet such as cloth and leather. A plurality of limited regions of the flat sheet are given unique symbols and indicators corresponding to respective ones of keys of the keyboard by a printing technique for example, whereby the flexible flat sheet serving as manually operable key tops or actuators. When depressing a specific limited region of the key flat sheet, its associated elastomeric connector comes into contact with a comb shaped counter connector contact formed on a printed circuit board. Such an arrangement provides a keyboard with no protruding key tops for a totally new dimension in slimness and portability of calculators.

Abstract: In an electronic calculator essentially comprising a multidigit display, a keyboard and a data processor unit, a multidigit liquid crystal display is deposited together with integral key actuators of the keyboard on a flexible circuit film which carries electrical conductor leaves in a desired pattern. The conductor leaves to be in contact with terminals of the liquid crystal display are formed to extend in the direction of length of the liquid crystal display to thereby establish room for a battery compartment.

Abstract: A power supply circuit supplies a liquid crystal energizing circuit with desired potentials for the purposes of energizing a liquid crystal display in accordance with combinations between first, second, third and reference potentials.

Abstract: In a combination of an electronic timepiece and an electronic calculator including a power source, a time keeping circuit, a calculation circuit, a keyboard unit for introducing information into the calculation circuit, and a display unit for displaying information stored in the time keeping circuit and the calculation circuit, a time period counter is provided for counting the time period when the electronic calculator is actually operated. The time period when the electronic calculator is actually operated is approximately proportional to the total power dissipation of the power source. The contents of the time period counter are displayed on the display unit for indicating the power dissipation of the power source.

Abstract: An electronic calculator disclosed herein is comprised mainly of a multi-digit liquid crystal display unit, a mechanical contact type keyboard unit and a semiconductor circuit unit including a computation circuit, logical control circuit, storage circuit, program memory circuit, etc., these units being all incorporated on a single plate of electrically insulating material. One of a pair of spaced apart electrically insulating plates forming a capacity for the liquid crystal composition is of a length sufficient to support all the constitutional units, which has two major surfaces one for supporting the keyboard unit and the other for supporting the semiconductor circuit unit. Connection between oppositely disposed keyboard unit and semiconductor circuit unit is accomplished by any conventional method, for example, multi-terminal connector, conductive material printing, through holes, wire bonding and so on.

Abstract: A key entry and translation system useful with data processing units such as electronic calculators for the purpose of entering desired input information from a keyboard in a predetermined code notation into the data processing units. The present system is of a type wherein the input information from the keyboard is sensed and manipulated in an arithmetic circuit contained within a central processor unit (CPU) in response to program instructions stored in a read-only memory (ROM) and then is entered into the data processing unit through an input buffer contained within a random access memory (RAM). Pursuant to the present system, key entries may be registered during arithmetic operations or printing procedures, through the use of a CPU. Furthermore, the present system is adapted to determine whether the input information from the keyboard is either present or absent before interrogation as to the contents of the input information, for the purpose of speeding up arithmetic operations.

Abstract: The present disclosure is directed toward a system for driving a plurality of liquid crystal display units each having a common electrode, a plurality of segment electrodes and a liquid crystal composition interposed between the said electrodes. First, second and third voltage levels are determined with respect to a reference level in such a manner that a voltage difference between any possible combinations and the reference level except the combination of the third level and the reference level is not higher than a given threshold voltage which initiates enabling of the liquid crystal display units. When the liquid crystal display units are desired to be energized, signals of the reference level and the third level are alternatively applied to the common electrode, whereas the inversion thereof is applied to the segment electrodes. When the liquid crystal display units are desired to be disabled, a signal either of the first or second level is applied to at least one of said electrodes.

Abstract: Disclosed is an electronic calculator which has a thermal printing head or active printing area exposed to the ambient environment to enable printing in a stamp-like fashion. In the preferred form, the thermal printing head comprises a predetermined number of thermal printing units each unit having a plurality of segment-shaped resistors. More particularly, a metal layer of platinum, nickel-chrome alloy, etc., is deposited in accordance with a segment configuration on a glass-glazed substrate of beryllium oxide. A current flow through the metal segments will cause the generation of heat therein which makes a clearly distinct record on a heat-sensitive paper.