This invention relates to a method and apparatus for the electronic screening of a graphic image to be reproduced by printing. The density of the graphic image is determined either repetitively or continuously during the generation of each dot which will form a part of the half-tone image when produced, and the dot is modified according to changes in the density. Thus the structure of any half-tone dot may be modified during its construction. Electronic screening processes are also disclosed emp...

An electronic watch including an electronic divider for dividing the high frequency output signal of a standard oscillator into low frequency timing signals. The oscillator and divider are driven by a battery having a capacitor fixedly connected in parallel therewith to serve as a voltage source during temporary disconnection of the battery.

An electronic timepiece having the electronic circuitry formed as a single monolithically integrated circuit chip is provided, a first portion of the circuitry being actuated by a first potential and a second portion of the circuitry being actuated by a second potential higher than said first. The circuit chip includes complementary coupled MOS transistors, the first and second circuit portions operating respectively at first and second logic levels. An interface is provided intermediate said fi...

An electronic wattmeter (transducer) to measure the average power to a load or on an electric power line includes a current transformer, a voltage transformer and a power transformer, the primary coil of each transformer being connected to the power line. The secondary coil of the current transformer is connected to a modulator so that changes in current vary the duty cycle, i.e., zero crossings, of a duty cycle modulator-oscillator. The modulator and the secondary of the voltage transformer are...

An electronic timepiece having a digital display for displaying time in response to timekeeping signals applied thereto is provided. A time correcting circuit including a manually operated switch is coupled to an electronic divider circuit which supplies the timekeeping signals to the display to correct the count therein corresponding to at least one displayed digit of time. When the switch is displaced momentarily a first correction signal is provided which corrects the displayed digit by index...

Apparatus for automatically actuating and deactuating the electrical circuitry of an electronic thermometer of the type which uses a temperature sensing probe and disposable probe covers in the measurement of body temperature. The probe projects fowardly from a thermometer housing and a tubular probe cover is installed by driving the probe rearwardly into the housing, against resilient means, until a retaining means on the housing engages the cover. The probe is rigidly attached to a probe eject...

An electronic organ comprises memory means for memorizing in an analog manner the synthesizing ratio of repetitively occuring waves such as square waves for synthesizing qualities of sound in response to the signals from means for selecting qualities of sound (to be referred to as tablets hereinafter); a mixing circuit for adding the synthesizing ratio for each repetitively occuring wave when the means for selecting qualities of sound are selected; frequency dividers for dividing the oscillation...

An oscillator suitable for construction in monolithic integrated circuit form includes a differential current steering circuit for controlling the charging and discharging of a capacitor. A single controlled current supply circuit is coupled to the differential current steering circuit, one half of which provides a current sink (source) for discharging (charging) the capacitor while the other half is coupled to the capacitor by means of a current mirror or inverter circuit to provide a current s...

An electronic thermostat for controlling the operation of a temperature changing device such as a heater or a cooling device to maintain the temperature of an object at a desired level. The thermostat comprises a device in heat exchanging relationship with the object for generating a temperature signal representative of the temperature of the object. A reference signal generator is operable to generate a reference signal representative of the desired temperature level. A comparator compares the ...

An electronic watch including a means to establish a time standard, a means to provide a frequency source from the time standard, a means to divide the frequency source into pulses representing seconds, minutes, hours, days, day of the week, months and years, means to display information visually and a means to drive the display including a control for activating said means to display and setting means to program said means to divide the frequency source.