Tungsten electrodes are arranged on two rhenium rods in an electrode chamber in a high-pressure gas discharge lamp, such that the rhenium rods project to inside the electrode chamber.

A Sigma-Delta modulator(10) comprises a signal put(34) coupled to a forward filter comprising a series connection of a plurality of N summing stages(28, 30, 32), where N is an integer of at least 2, alternating with a corresponding plurality of integrating stages(40, 42, 44) and an analogue to digital converter(ADC)(18) having an input coupled to an output of the Nth integrating stage(44) and an output. A feedback filter comprises a feedback coupling from the output of the ADC(18) to a digital t…

Halides of Mn, Ba, Ca, Sr, Ce and La are used as a binder for getters in electric lamps. They have the advantage over organic binders of producing no oxygen-containing decomposition products when the lamps are put in operation.

A receiver having a phase-locked loop (PLL) for synchronizing its oscillator with a carrier (CA). A calibration circuit (CAL) calibrates the phase-locked loop’s oscillator (OSC) in the following manner. It measures (FMC) the frequency difference (dF) between a nominal frequency (Fnom) of the carrier (CA) and a frequency (Fosc) of the phase-locked loop’s oscillator (OSC). Furthermore, it adjusts the frequency (Fosc) of the PLL oscillator in accordance with the measured frequency difference (dF). …

The use of phosphorthionitride as a getter in electric incandescent lamps having an envelope, current carrying members, and a filament.

The invention relates to a method of adjusting a desired spectrum of light emitted by a gas discharge lamp during its operation, said gas discharge lamp comprising a first ionizable substance and a second substance which is less readily ionizable than the first substance. According to the invention, the gas discharge lamp is operated such that gases of both substances cans be excited, while the partial pressure of the first substance is adjusted in dependence on the desired spectrum. For this pu…

A low IF receiver suitable for use in cellular and cordless telephones and TV tuners, comprises input signal receiving means(10), quadrature related frequency down conversion means including first and second mixing means(14, 15) having first inputs(12, 13) coupled to the input signal receiving means and a local oscillator means(16) for generating a local oscillator signal having a frequency offset from a nominal centre frequency of the input signal coupled to second inputs(18, 19) of the first a…

An additive which protects the anode against roughening is included in a surface layer of the anode of an X-ray source for generating X-rays within a comparatively narrow wavelength range. The additive is provided by deposition of material in vacuum, followed by diffusion of the material into the anode body.

A cutter foil comprising a metal plate having apertures separated by partitions, each aperture being defined by a surrounding wall projecting inwardly of the plate, the thickness of the partitions being less than the thickness of the surrounding walls.

The invention relates to a loudspeaker whose electrical contacts (30a, 30b) for connecting to the coupled electronic circuits are plates that can be bent. To prevent the crushing of these contacts while a board is joined to the loudspeaker, or in case of accidental fall, one or various stops (40a, 40b) firmly attached to the frame (10) of the loudspeaker are provided and restrict the deformation of the plates.