Abstract: The invention relates to an electric lamp, provided with a metal-plastic cap, for a motor vehicle headlight, which has a pressing-on spring (100) which is arranged laterally on the lamp cap and serves to mount the lamp in the reflector opening, constructed as lamp holder, of the headlight. The lamp cap has a metal holder part for the lamp bulb, a metal annular carrier sleeve (14b) connected thereto, and a plastic cap part (15) in which the carrier sleeve (14b) is anchored. According to the invention, the annular carrier sleeve (14b) has two inwardly angled lugs (14d) between which the pressing-on spring (100) is arranged with a clamping fit, and which are crossed with the ends (104a) of the pressing-on spring (100).

Abstract: An operating method, in particular a dimming method for a discharge lamp. In order to set the maximum brightness, two outer electrodes (5,6), for example, are used to generate in the discharge lamp a dielectrically impeded discharge which, through the formation of xenon excimers, emits UV radiation which is converted into light with the aid of fluorescent materials (2). In order to permit intense dimming of the discharge lamp, two cold cathodes (3, 4) are used to generate a xenon low-pressure discharge emitting UV beams, and the dielectrically impeded discharge is switched off. Both types of discharge are preferably excited by high-voltage pulses which are generated by an operating unit (7). Dimming is preferably performed by blanking pulse trains.

Abstract: The invention relates to an electric lamp for a motor vehicle headlight. The lamp is equipped with an adjustment ring (4) which has at least three bearing points (4a) which are arranged in a common plane oriented perpendicularly with respect to the axis of the adjustment ring (4). Along its inner circumferential surface, the adjustment ring (4) has at least three contact points (8a) with the lamp cap (1), in which points the adjustment ring (4) is fixed to the lamp cap (1).

Abstract: A flat radiator having dielectrically impeded, strip-like cathodes (12;15) and anodes (8;9a) which are arranged alternately next to one another on the wall of the discharge vessel (14) has in each case an additional anode (9b) between neighbouring cathodes (12;12,15), that is to say an anode pair (9) is arranged in each case between the cathodes (12;12,15). The cathodes (15) have nose-like extensions (28) which face the respectively neighbouring anodes (8) and are arranged more densely in a spatially increasing fashion in the direction of the edges (26,27) of the flat radiator (13). As an alternative or in addition thereto, the two anode strips (9a,9b) of each anode pair (9) are widened in the direction of the edges (26,27) of the flat radiator (13) at one end in the direction of the respective partner strip (9b or 9b). Owing to these measures, the surface luminous density of the flat radiator (13) is largely constant towards the edges (26,27,29,30) in pulsed operation.

Abstract: The invention relates to a motor vehicle headlight lamp having a metal-plastic cap whose electric connections are constructed as contact lugs (16, 17). According to the invention, the two contact lugs (16, 17) in each case have a groove (16c, 17c) in which in each case a supply lead wire (12, 13) which is guided out of the lamp bulb is fixed to the corresponding contact lug (16, 17) by a welded joint. Furthermore, the contact lugs (16, 17) are equipped with means (16f, 17f) for threading the supply lead wires (12, 13) into the respective groove (16c, 17c) and the lamp cap has at least one cut-out (18) which serves the purpose of carrying out the welding of the supply lead wires (12, 13), arranged in the grooves (16c, 17c), to the contact lugs (16, 17).

Abstract: A new starting circuit ALS for a free-running oscillator circuit, in particular for a field-effect transistor half-bridge in an electronic ballast for a low-pressure gas discharge lamp EL is described. By using a starting capacitor C5, it is possible to dispense with a diac.

Abstract: A gas discharge lamp having a discharge vessel (202) which is at least partially transparent and filled with a gas filling, a number of essentially strip-shaped anodes (205, 206) and cathodes (203, 204) which extend on the walls of the discharge vessel and essentially parallel to each other, and a dielectric layer (215) between at least the anodes and the gas filling for a dielectrically impeded discharge in the discharge vessel between neighboring anodes and cathodes, characterized in that at least one anode pair (205) is arranged between two cathodes (203, 204) respectively adjacent to one anode pair.

Abstract: The invention relates to an electric luminaire having a luminaire housing (10, 11) and at least one low-pressure discharge lamp (12) as well as an operating device for operating the at least one low-pressure discharge lamp (12), the operating device having lamp-side (19a) and line-side electric terminals (19e, 19f) for supplying voltage to the at least one low-pressure discharge lamp (12) and to the operating device. The at least one low-pressure discharge lamp (12) is uncapped and has a plurality of supply leads (14a, 14b, 14c, 14d) which project from its discharge vessel (12) and are connected in each case to one of the lamp-side electric terminals (19a) of the operating device. Furthermore, the components of the operating device are arranged together with the electric terminals (19a, 19e, 19f) of the operating device on a common mounting plate (18), and the electric terminals (19a, 19e, 19f) are constructed as insulation-piercing contacts.

Abstract: A method for producing pulsed-voltage sequences for the operation of discharge lamps (8) by means of a pulsed discharge which is impeded dielectrically provides for some of the required pulse peak values to be replaced by an offset DC voltage component (UDC(t)). This has, inter alia, the advantage that correspondingly less EMI is generated when the pulsed-voltage sequences (Up(t)) are produced. It is also provided for a portion of the electrical real power injected into the discharge predominantly throughout the duration of the voltage pulses to be injected on the basis of the offset DC voltage (UDC(t)). For this purpose, a circuit arrangement provides a series circuit comprising a pulse circuit (1) and a DC voltage circuit (2), in which case the pulse circuit (1) can be designed for a power level.

Abstract: A flat radiator (4), suitable for a dielectrically impeded discharge and with a discharge vessel (5) made from an electrically non-conducting material has strip-like electrodes (6, 7) arranged on the wall of the discharge vessel (5), cathodes (6) and anodes (7a) being arranged alternately next to one another, and at least the anodes being separated from the interior of the discharge vessel (5) by a dielectric material (10). In each case one additional anode (7b) is arranged between neighbouring cathodes (6), that is to say in each case one anode pair (7a, 7b) is arranged between the neighbouring cathodes (6). The result is a uniform discharge structure accompanied by optimum utilization of the discharge vessel. FIG.

Abstract: A metal halide discharge lamp having a bulb which contains a fill including an ignition gas, mercury, a halogen, lithium, indium, thallium and tin, and which is devoid of a rare earth element. Such fill serves to lengthen the service life of the lamp. The lamp is especially suitable for effect lighting.

Abstract: The reflector lamp has a lamp support (10) which permanently connects the bulb (3) to the reflector neck (7). To this end, the lamp support has a clamping device (23) which cooperates with a web (11) on the reflector neck.

Abstract: The invention relates to an electric lamp, the cap (3) of which has at least two resilient tabs (8), which are each provided with a latching lug (8a), and an attachment ring (6), which is mounted so that it can rotate about its ring axis, the tabs (8) bearing against the inside of the attachment ring (6) with a clamping fit, and the inside having wall areas which are at different distances from the ring axis. By rotation of the attachment ring (6), pressure is exerted on the tabs (8) and the latching connection of the latching lugs (8a) in the lamp holder is released.

Abstract: The present invention relates to a circuit for power-factor correction having a bridge rectifier (18) with a first and a second input connection (14, 16) in which case an AC voltage source (10) can be arranged between the first and the second input connection (14, 16), and having a first and a second output connection (30, 32), an actuation and load circuit (24), at least one energy storage apparatus, (20; 20a; 20b), whose first connection is connected to a connection (28) in the actuation and load circuit (24), in which case the signal which can be tapped off at this connection (28) in operation is at a considerably higher frequency than the output signal from the AC voltage source (10), and an energy storage capacitor (CS), wherein the energy storage capacitor (CS) is arranged in parallel with the output connections (30, 32) of the bridge rectifier (18), and the second connection of the at least one energy storage apparatus (20; 20a; 20b) is connected to one of the two input connections (14; 16) of the brid

Abstract: The invention relates to a circuit arrangement for operating at least one discharge lamp (LP) on a half-bridge inverter (Q1, Q2), having at least one coupling capacitor (C3) and having a switch-off device (T1, A) which permanently switches off the half-bridge inverter (Q1, Q2) when the lamp (LP) refuses to start. According to the invention, the circuit arrangement has first and second devices (V1, V2) for monitoring the voltage drop across the at least one coupling capacitor (C3) and for activating the switch-off device (T1, A) as a function of the voltage drop detected across the at least one coupling capacitor (C3). If the voltage across the coupling capacitor (C3) deviates substantially from its normal value, for example owing to the occurrence or the rectifying effect at the end of the service life of the discharge lamp (LP), the half-bridge inverter (Q1, Q2) is shut down by the switch-off device (T1, A).

Abstract: A circuit arrangement for operating at least one high-pressure discharge lamp with a high-frequency alternating voltage, the circuit arrangement having a voltage converter (W) with an alternating voltage output (j10, j11), a load circuit which is connected to the alternating voltage output (j10, j11) and which has at least one lamp inductor (L1), a coupling capacitor (C1) and terminals (j12, j13) for at least one high-pressure discharge lamp (LP), and a starter (Z) with a high-voltage source and a high-voltage DC output (j14, j15) for starting a gas discharge in the at least one high-pressure discharge lamp (LP). The coupling capacitor (C1) is connected to the high-voltage DC output (j14, j15) via a charging resistor (R1).

Abstract: The invention relates to the fastening of incandescent coil filaments to current lead-in wires in electric lamps. One end (41) of the current lead-in wires is flattened and U-shaped. The U-shaped segment (41) of the current lead-in wire forms a gap-like seat (45) for a coiled incandescent coil-filament end (3a), the gap width of which is smaller than the outside diameter of the incandescent coil-filament end (3a).

Abstract: The invention relates to a high-pressure discharge lamp having a base at one end and whose return conductor (13) is protected with the aid of a bidirectional trigger (D) against high induced voltages of the radio interference suppression reactor (L1) connected to the return conductor (13).

Abstract: A presentation is given of an improved method for coating lamp tubes for gas discharge lamps and for drying the coating, as well as of a device designed for the method, in the case of which method and device, during coating and drying, the lamp tubes are arranged at an oblique angle to the horizontal.

Abstract: A circuit arrangement for starting and for operating high-pressure lamps makes an increased transfer voltage available to the discharge lamp. The increased transfer voltage is generated by voltage doubling across a rectifier unit by means of a charging capacitor (LK), separated into two individual capacitors (C1, C2), the common midpoint (M) of the capacitors (C1, C2) being connected to the two network inputs of the rectifier unit.