Abstract: The invention relates to an incandescent lamp for motor vehicle headlights, having at least one incandescent filament (2) arranged inside the lamp vessel, and a shading device (4). A coil exit (2a) of the incandescent filament (2) is joined to an edge section (41) of the shading device (4) running substantially parallel to the coil axis, in order to ensure an improved suspension of the incandescent filament (2).

Abstract: Sealing foil for making a lamp (1), comprising a metallic base body made from molybdenum and a coating which has been applied to at least part of the base body and which contains chromium, rhenium or ruthenium, alone or as an alloy, the foil being formed as a stack comprising two parts (10, 11) which have a different coating.

Abstract: Lighting system for high-pressure discharge lamps which can generate a lamp voltage UL which is amplitude and, if necessary, frequency-modulated. The frequency modulation is provided by an inverter whose inverter frequency is modulated. The inverter is fed by a clocked d.c. voltage supply which emits an operating voltage U0 which is amplitude-modulated.

Abstract: Circuit arrangement for operation of incandescent lamps in motor vehicles.

Abstract: A metal halide lamp with ceramic discharge vessel (4), the discharge vessel having two ends (6) that are sealed with ceramic stoppers that in each case contain an elongated capillary tube (12), termed stopper capillary below, of inside diameter K, and wherein an electrically conducting lead-through (9, 10), which comprises an inner part (14) and an outer part (13) with reference to the discharge, is guided through this stopper capillary (12) and is sealed outside with glass solder (18), there being fastened on the lead-through an electrode (16) with a stem (15) that projects into the interior of the discharge vessel, the outside diameter S of the inner part being coordinated with the inside diameter K, the inner part (14) being a composite component that comprises a core pin (18) of diameter D onto which there is mounted as a double ply a coil with an effective diameter d of the core wire, the following relationships being fulfilled:

Abstract: The invention relates to an incandescent lamp for a motor vehicle headlight. The secondary filament (2) is arranged in such a way that, in a projection plane that is arranged perpendicular to the reference plane (B), the edge (2a), facing the antidazzle device (4), of the image, projected onto the projection plane, of the second incandescent filament (2) is arranged over the entire length of the second incandescent filament (2) between the reference axis (A) and the antidazzle device (4), and the edge (2a), facing the antidazzle device (4), of the image, projected to the scale 1:1 onto the projection plane, of the second incandescent filament (2) has a prescribed spacing from the reference axis (A). It is thereby possible to produce the light/dark boundary for the lower beam with the aid of the edge (2a) of the secondary filament image (2).

Abstract: A metal halide fill for forming an ionizable fill comprises at least one inert gas, mercury, and at least one halogen, the fill additionally comprising the following constituents: Mn halide and V halide. This fill may in particular be present in the discharge vessel of a metal halide lamp.

Abstract: A luminaire for installing in the cover cap of an exterior rearview mirror for motor vehicles, has a luminaire housing and an electrical lamp arranged therein. The housing is entirely or partly of transparent design, such that in the installed state light exit surfaces of the housing are arranged both on the front side and on the rear side of the exterior rearview mirror. The lamp has a tubular, sealed lamp vessel, at least a portion of the lateral surface of the lamp vessel and an end face of the lamp vessel being of transparent design. Light directing elements for focusing the light emerging from the lateral surface and for deflecting the light emerging from the end face are provided such that the light emerging from the end face is directed toward a light exit surface arranged opposing the light emerging from the lateral surface.

Abstract: The invention relates to a novel operating circuit for a low-pressure discharge lamp 1 with early EOL detection via a measurement of the DC voltage between the electrodes 2, 3. In this case, an electrode interrogation can be carried out by checking a respective connection via the electrodes 2, 3 to a respective reference potential.

Abstract: The invention relates to a novel operating circuit for a low-pressure discharge lamp 1 with early EOL detection via a measurement of the DC voltage between the electrodes 2, 3. In this case, the DC voltage can be modified by an offset voltage 10 such that only one polarity has to be taken into account during measurement.

Abstract: The invention relates to a novel operating device for lamps, in particular low-pressure gas discharge lamps, in which a SEPIC converter is used for charging a storage transistor from an AC voltage supply. In this case, the SEPIC converter is regulated to an output quantity as regulated variable, its operating frequency being altered. Preferably, only the switch-on time and not the switch-off time of the switching transistor of the SEPIC converter is altered in this case.

Abstract: The invention relates to a rod-core transformer for use as a starting transformer in the cap of a high-pressure discharge lamp for a motor vehicle headlight. According to the invention, the rod-core transformer has at least two cores (2, 3) which are in the form of rods and are arranged alongside one another, and on each of which a multilayer secondary winding (4, 5) is wound, with the respective layers (4a, 4b, 4c, 4d) and (5a, 5b, 5c, 5d) being connected in parallel and being arranged one above the other without any offset. Furthermore the secondary windings (4, 5) are electrically conductively connected to one another, with their total resistance being at most 2 &OHgr;. The transformer according to the invention is particularly highly suitable for use as a starting transformer for high-pressure discharge lamps with a low operating voltage, for example halogen metal-vapour high-pressure discharge lamps which do not contain mercury.

Abstract: The invention relates to an operating circuit for a low-pressure discharge lamp LP, in which the lamp electrodes can be preheated by means of a resonant circuit C14, T11. In order to determine the resonant frequency accurately and to establish the lamp type being used, a frequency range is moved through at the start of operation and the voltage is measured on a primary winding T11 of a preheating transformer.

Abstract: Free-running half-bridge inverter (HP) for operating gas discharge lamps having a current transformer as a feedback device. The half-bridge transistors (T1, T2) are essentially voltage controlled transistors (MOSFET). The drive circuits (1, 2) for the half-bridge transistors (T1, T2) contain a voltage threshold value switch (D2, R2) which, on reaching its voltage threshold, essentially carries a current which is proportional to the load current of the half-bridge inverter (HB).

Abstract: Compact low-pressure discharge lamp The invention relates to a compact low-pressure discharge lamp (1) comprising a discharge vessel (3) with electrodes and power supply leads (7), a discharge vessel mount (5) and a cap (12) which comprises a housing (13), connecting contacts (14) and a mounting plate (15) with a ballast apparatus (16), with the mounting plate (15) being fitted with the ballast arrangement (16) in the interior of the cap housing (13), and having connections for electrical connection of the mounting plate (15) to the power supply leads (7) and to the connecting contacts (14). The discharge vessel mount (5) has an essentially H-shaped cross section and comprises a plate (4) with collars (9, 18) running on the edge of each side of the plate. Both the housing (13) of the cap (12) and the cover part, which is in the form of an enveloping bulb (2), a reflector or a closure cap, are mounted on this H-shaped discharge vessel mount (5).

Abstract: The invention relates to a compact low-pressure discharge lamp (1) comprising a discharge vessel (3) with electrodes and power supply leads (7), a discharge vessel mount on which the discharge vessel is mounted, and a cap (10), which comprises a housing (11), connecting contacts (12) and a mounting plate (13) with a ballast apparatus (15), with the mounting plate being fitted with the ballast arrangement in the interior of the cap housing, and having connections for electrical connection of the mounting plate to the power supply leads and to the connecting contacts. The discharge vessel mount in this case comprises a plate (5) which is mounted in a further mount, with the further mount in turn being mounted on the housing of the cap. The further mount may be in the form of an enveloping bulb (2) or a reflector for the discharge vessel, or in the form of a closure cap (20) for the cap housing.

Abstract: The invention relates to a cost effective protective device for safeguarding an electrical device against overcurrent. The preferred exemplary embodiment is a conductor track fuse that is arranged in a hollow body. According to the invention, the hollow body has an opening (8) that specifically allows metal vapor to escape upon tripping of the fuse. This prevents the production of an electric arc.

Abstract: The phosphor composition for low-pressure gas discharge lamps with a high light efficiency for generating radiation with a color temperature of greater than 5000 K and a very good general color rendering index Ra of greater than 90 includes at least one halophosphate phosphor, a phosphor which emits in the red wavelength region and a phosphor which emits in the blue-green wavelength region. In addition, according to the invention the phosphor composition contains an Eu-doped barium magnesium aluminate phosphor BaMgAl10O17:Eu and a Tb-doped green-emitting phosphor.