Abstract: A reflector lamp may be made with a reflector and base holding a hermeticy sealed bulb. The bulb encloses a filling and a light source, the light source being a high voltage or medium voltage light source in which an operating voltage of at least 80 volts is present. The reflector consists of a basic body with a reflector contour and a neck part attached to a rear portion of the basic body, and a base which is joined to the neck part and which has at least two metallic contact pins with cylindrical seals on an end farthest from the bulb. A current feeder system makes an electrical lead available for use by the light source. The base is formed completely from the same material as the neck part and as an integral part directly on the neck part of the reflector.

Abstract: A radiation source, in particular a discharge lamp suitable for operating a dielectrically hindered pulsed discharge by means of a ballast, has at st one electrode separated by dielectric material from the inside of the discharge vessel. By appropriately designing at least one of the electrodes and/or the dielectric material, local field reinforcement areas are created, so that during the pulsed mode of operation one or more dielectrically hindered individual discharges are generated exclusively in these areas, maximum one individual discharge being generated in each area. These areas are obtained in particular by shortening the spacing in locally limited areas, for example by providing on one of the electrodes hemispherical projections which extend towards the counter-electrode. This measure achieves a timestable discharge structure with a high useful radiation effectiveness uniformly distributed throughout the discharge vessel.

Abstract: A capping cement for electric lamps which has a minimal resin content. The capping cement includes both natural and synthetic resins, the content of the synthetic resins amounting to not more than 11 percent by weight and that of the natural resins not more than 5 percent by weight. Calcites are used exclusively as fillers. The weight proportion of natural resin to synthetic resin is advantageously between 0.1 and 0.5.

Abstract: A circuit arrangement for operating a load, in which in normal operation control energy for activating the switching element or switching elements (T.sub.a, T.sub.b) is obtained from the energy content of the freewheeling current anti-parallel relative to this switching element, and the ON duration is determined by the time constants of control energy storage elements which are assigned to the switching elements, or by the storage time of bipolar transistors.

Abstract: The invention relates to an ignition apparatus for a discharge lamp, in picular high-pressure discharge lamp for motor vehicle headlights. The ignition apparatus, which is preferably designed as a pulse ignition device, is accommodated in the lamp base. According to the invention, it has; a plate (1), which is composed of an electrically conductive material, is matched to the geometry of the base and on which at least the ignition capacitor (C1) and the spark gap (F1) are fastened, at least one first electrical connection of the ignition capacitor (C1) and at least one first electrical connection of the spark gap (F1) being electrically conductively connected to the plate (1).

Abstract: The invention relates to a low-pressure discharge lamp with at least one porting element (12) placed inside a discharge vessel (10). Said supporting element is provided with a mercurial coating (13) and is coated with a getter material (14). The coated surfaces of the supporting element (12) are inclined at an angle of at least 30 degrees in relation to the longitudinal axis (A--A) of the discharge vessel (10).

Abstract: A switched-mode power supply for supplying a DC-fed load (LD) by a steppep, stabilized DC voltage (uzw), which is formed from an AC mains voltage (U) by means of a rectifier circuit (D1 to D4), a charging inductor (L1), a switch (V1), which is controlled by a control unit (2) and has its switching path connected in parallel with outputs of the rectifier circuit, and also a charge storage arrangement (D5, C1, C2, D6), which is connected once again in parallel with the switching path of the said switch. In this case, the charge storage arrangement (D5, C1, C2, D6) comprises a series circuit of charging diodes (D5 and D6) and two storage capacitors (C1, C2), whose common junction point is connected to a neutral conductor terminal (N) of the rectifier circuit.

Abstract: A flat fluorescent lamp (1) has a discharge vessel (2) having a base plate (7), a top plate (8) and a frame (9) which are connected to one another in a gas-tight fashion by means of solder (10). Structures resembling conductor tracks function in the interior of the discharge vessel as electrodes (3-6), in the feedthrough region as feedthroughs, and in the external region as external supply leads (13; 14). Flat lamps of the most different sizes can thereby be produced simply in engineering terms and in a fashion capable of effective automation. Moreover, virtually any electrode shapes can be realized, in particular optimized with regard to a uniform luminous density with a reduced drop in luminous density towards the edges of the flat lamp. At least the anodes (5, 6) are covered in each case with a dielectric layer (15). The lamp (1) is preferably operated by means of a pulsed voltage source and serves as background lighting for LCDs, for example in monitors or driver information displays.

Abstract: The invention concerns an electric lamp, particularly a high-pressure disrge lamp or halogen bulb with a base on one side for a motor-vehicle headlight. The base of the lamp of the invention has a base sleeve (110) comprised of an electrically insulating material and a mounting element (111) also comprised of an electrically insulating material, which bears lamp bulb (116) and which is joined with base sleeve (110). According to the invention, a metal part (121) is anchored in mounting element (111) and a metal ring (122) is anchored in base sleeve (110), whereby metal ring (122) is equipped with several shaped spring-type weld lugs (122), which are welded with metal part (121) anchored in mounting element (111).

Abstract: Proposed for the purpose of starting a high-pressure discharge lamp is a cuit which in the conventional way comprises a starting transformer (12) whose secondary side is connected to the lamp to be started and whose primary side is connected to a circuit triggering the starting pulse, the circuit triggering the starting pulse generating starting pulses with a pulse duration of less than 0.5 .mu.s and a repetition frequency of at least 2 kHz. An IGBT (Insulated Gate Bipolar Transistor) (14) is preferably used as switching element.

Abstract: The invention relates to a compact low-pressure discharge lamp comprising a discharge vessel 14 having electrodes and supply leads 30, and having a mp cap 12 assembled from a cap 16, housing 18 and mounting plate 24 with a ballast arrangement. In this case, the mounting plate 24 with the ballast arrangement is fitted in the interior of the lamp cap housing 18. The mounting plate 24 also has terminals 26 for the electric connection of the supply leads 30. According to the invention, in this case the supply leads 30 are connected to the electric terminals 26 of the mounting plate 24 via an electrically conducting spring element 28 in each case.

Abstract: An electric lamp may be formed with a lamp bulb, with lead wires leading out from the lamp bulb and with a base which incorporates a connection region made of electrically insulating material and provided with electrical connections. The connection region includes a cavity into which at least one lead wire of the electric lamp projects, and at least one electric connection of the base is formed by a contact lug which projects into the cavity in an electrically conducting manner with a lead wire of the lamp. A shaped part consisting of heat-resistant, elastic material is located in the cavity of the connection region. The shaped part has one or more passages for each lead wire of the electric lamp. The shaped part sits on a contact lug and abuts the wall delimiting the cavity in a press fit, and the lead wires pass through the shaped part.

Abstract: The invention relates to a method for producing an electric incandescent p which has at least one incandescent filament (31) and an anti-dazzle device (20). According to the invention, in the course of the method, an end (31a) of an incandescent filament (31) is threaded into a notch (23) on the edge of the anti-dazzle device (20) and fused with the anti-dazzle device (20) by melting the material of the anti-dazzle device (20) in the region of the notch (23) so that the melt wets the incandescent filament end (31a) arranged in the notch (23) and the incandescent filament end (31a) is embedded in the solidified material (20a) of the anti-dazzle device (20) after the melt has solidified.

Abstract: The invention relates to an operating circuit for an electrodeless low-prure gas discharge lamp designed for power between some watts and some kilowatts having a switching system which operates at high frequency in a freewheeling mode close to resonance.

Abstract: A circuit is proposed for the AC voltage operation of a discharge lamp by ans of a coupling capacitor (C3) with a safety disconnection device, connected in series with the lamp for DC current separation, which is characterized by the fact that the safety disconnection device responds to a DC voltage (UC3) at coupling capacitor (C3) by means of a DC current component flowing through the lamp.

Abstract: A metal-halide high-pressure discharge lamp (1) with a discharge vessel (2) nd two electrodes (4, 5) has inside discharge vessel (2) an ionizable filling, which contains yttrium (Y) in addition to inert gas, mercury, halogen, thallium (Tl), hafnium (Hf), whereby hafnium can be replaced wholly or partially by zirconium (Zr), dysprosium (Dy) and/or gadolinium (Gd) as well as, optionally, cesium (Cs). Preferably, the previously conventional quantity of the rare-earth metal is partially replaced by a molar equivalent quantity of yttrium. With this filling system, a relatively small tendency toward devitrification is obtained even with high specific arc powers of more than 120 W per mm of arc length or with high wall loads. Thus, the filling quantity of cesium can be clearly reduced relative to a comparable filling without yttrium, whereby an increase in the light flux and particularly in the brightness can be achieved.

Abstract: The invention relates to a circuit arrangement for operating a lamp (EL), particular a low-pressure discharge lamp, with a load circuit which has at least one inductor (L2) and at least one capacitor (C7, C8, C9), and with an invertor which may be configured as a half-bridge arrangement with two switching elements (T1, T2), and with a drive circuit (AS) for driving the switching elements (T1, T2). The invention provides that the drive circuit (AS) has at least one LC parallel tuned circuit (L3C3, L4C4). The circuit arrangement according to the invention can be produced without separate cost-intensive wound parts.

Abstract: The circuit for operating a high-pressure gas discharge lamp (HID) has a ice (ZZU) for ignition-time bridging by switching in a second lamp (GL), the ignition-time bridging device (ZZU) being driven by a signal (S) indicating the operating state of the high-pressure discharge lamp (HID), and the drive signal (S) being an output signal of a power controller (R) of the circuit.

Abstract: The present invention relates to a converter housing 10, in particular for n electronic converter for halogen lamps. The converter housing 10 in this case has a basic housing body 12 for holding electronic components, and a terminating element 14 with a cable support for supporting at least one electric connecting cable. The basic housing body 12 and the terminating element 14 are arranged perpendicular to one another in this case. At the end opposite the terminating element 14, the basic housing body 12 additionally has an end face 18 rounded off towards its underside.

Abstract: Halogen bulb without additional safety device for high-volt/intermediate-t operation with a bulb pinched on one side produces an inherent safety effect by producing a current lead segment that is pinched from an uncoiled wire with a diameter of 130 .mu.m at most and the distance between the two current leads is suitably selected.