Abstract: Disclosed is a method for the control of the pixels of a plasma panel by selective addressing and semi-selective addressing. The disclosed method can be applied to cases where a pixel is defined at the intersection of a column electrode with a pair of sustaining electrodes. The disclosed method can be used, notably, to obtain a reduced picture cycle time. To this effect, according to one characteristic of the disclosed method, certain pixels are controlled simultaneously by semi-selective addressing while other pixels are controlled by selective addressing.

Abstract: A fluorescent lamp is connected in parallel with a resonant L-C circuit powered by a series-applied high frequency voltage from a self-oscillating inverter power supply. The frequency of the series-applied voltage is about 33 kHz during the brief initial period before the lamp ignites, but falls to about 30 kHz after the lamp has ignited. As a result, the detuning taking place in the L-C resonant circuit due to changing parallel-loading is compensated-for by correspondingly changing the frequency of the series-applied voltage. This detuning effect is particularly pronounced in situations where there is a large magnitude-ratio between the lamp's ignition voltage and its operating voltage.

Abstract: An apparatus for reproducibly positioning an object within a color measurement instrument comprising a bracket for attachment to the instrument, a support to orient the object in a predetermined, fixed position and a method for varying the position of the object by moving the support in horizontal and/or vertical directions in order that the optimum color properties of the object may be determined. A quality control system which comprises a comparison of the optimal color values as measured for a first sample to the color values measured for a representative sample of a production run.

Abstract: A constant current transformer for gas-discharge tubes consisting of an aluminum can containing an iron core made of grain-oriented magnetic sheet material in split-tape core form with electrically isolated primary and secondary windings. The core has gaps on opposite sides with non-magnetic spacers. Stray field yokes are provided adjacent the gaps. A series-resonance capacitor is included in the can. The active parts fit tightly against the can, which serves to carry away heat losses. The parts are impregnated in the can using an epoxy resin in an overpressure centrifuging process. The primary and secondary windings may be connected outside the transformer in a voltage-adding arrangement in series with a load. Two or more transformers may be connected with their primaries in parallel and their secondaries in parallel with a load so that their currents are added, or with their secondaries in series with a load to add their voltages. An inductance may be connected in series with the series-resonance capacitor.

Abstract: A solid-state switching system which produces one or more switching signals in response to a power circuit current's reaching a preset level or levels whereby remote control of associated apparatus may be effected without independent control circuits.