Abstract: An improved welding auxiliary material for producing welded joints between refractory metal parts of high-wattage electric light sources is described. The characteristic feature of the invention is that the welding auxiliary material has a porous structure surface layer sintered from a refractory metal powder having a melting point of above 2000.degree. C.

Abstract: A high pressure discharge lamp, comprising an inner discharge tube, an outer envelope, current leads, a lamp stem in the outer envelope for containing the current leads, a longitudinal axis, a getter holder having a surface with getter thereon for increasing the service life of the lamp, the surface of the getter holder being located adjacent to and facing the lamp stem at a maximum angle of 90.degree. with the longitudinal axis.

Abstract: The present invention relates to low-pressure discharge lamp having a discharge tube filled with mercury and a noble gas, sealed in a gas-tight manner and provided with electrodes at its ends and having a cap connected to the discharge tube and contact components for connection to a power supply, the discharge tube ends containing the electrodes are arranged adjacent to each other, the electrode-side ends of the discharge tube are fixed--e.g. by means of an adhesive--in the cap, at least a portion of the electrode leads is fixed in the holes of the connecting part of the cap and is connected to conduct electric current, with at least a part of the contact components protruding from the outer side of the connecting part.

Abstract: A light source includes a reflector, a lamp and a securing mechanism firmly fixing the lamp to the reflector. The reflector includes a reflecting portion and a central hollow neck portion having an inner surface. The lamp includes an envelope provided with a pinch-sealed portion; a light emitting component accommodated in the envelope; and current feedthroughs electrically connected to the light emitting components and passing through the pinch-sealed portion to project outwardly from the envelope. The securing mechanism includes a first metal sleeve tightly surrounding the pinch-sealed portion of the envelope; a second metal sleeve lining the inner surface of the neck portion of the reflector and surrounding the first metal sleeve; and clamping components affixed to the second sleeve. The clamping components fit into the hollow neck portion and encase the inner surface thereof from two opposite sides. The first and second metal sleeves are fixedly secured to one another.

Abstract: In a lamp with a reflector envelope ensuring modified light output, comprising a conical reflecting body (2), an insert light source (4) arranged within the conical reflecting body (2) and a light transmitting front element (3) fixed to the conical reflecting body (2), there is between the conical reflecting body (2) and the front element (3) a clearance (10) determined by the dimensions and the inner spring force of a mechanical fixing body (5) connecting the conical reflecting body (2) and the front element (3), wherein at least a part of the clearance (10) is occupied by a deformable sealing material (6) or adhesive.

Abstract: A low-pressure mercury vapor fluorescent lamp has a luminescent coating including a small quantity of a fine grain inactive material such as a calcium, strontium or barium chloroapatite, which inactive material has a surplus of a metallic cation giving the coating a net positive charge to deter absorption of mercury ions and prolong the life of the lamp.

Abstract: A container box for packaging at least two side-by-side situated items such as light bulbs, includes a plurality of serially interconnected side sheets defining an inner box space having opposite ends defining an inserting direction in which the items are introduced into the inner box space; closing tabs attached to the side sheets for closing the box ends; and a support tab partially cut out from one of the side sheets. The support tab includes a bridging band having one end attached to the side sheet and a width of at least 3 mm; a folding line extending across the bridging band parallel to the band width and the inserting direction; and a partition attached to another end of the bridging band and having a maximum width measured parallel to the width of the bridging band. The maximum width is at least 1.5 times the width of the bridging band.

Abstract: In a method of manufacturing incandescent lamps with halogen, particularly fluorine filling comprising the steps of preparing a body of an incandescent lamp, the body consisting of an envelope made of a translucent material, an incandescent filament arranged within the envelope on supporting means, current lead-in members and a sucking pipe communicating with the inner space of the envelope, evacuating the inner space to a pressure from about 4 Pa to about 5 Pa by the means of a pumping system connected with the sucking pipe, introducing into the inner space a filling comprising an inert gas and a halogen element, ensuring thereby inner pressure about 10.sup.5 Pa within the envelope, closing the sucking pipe for separating the body from the pumping system, and carrying out the evacuating process with a stop at an intermediate pressure, heating up the body to a temperature in the range from about 500.degree. C. to about 600.degree. C. and then continuing the evacuating process.

Abstract: A halogen-filled incandescent lamp includes a curved tube enclosure made of a translucent material and enclosing a gas filling and an incandescent body made of a tungsten wire helix of circular wire cross-section. The incandescent body is arranged within the enclosure. Two inside current conductors connect the incandescent body with an energizing device. Each inside current conductor has first and second spiral members and an elongated part forming together a series assembly. The series assembly is connected via the second spiral member with the incandescent body and via the first spiral member with the energizing device. The series assembly is at least partly made of a wire having a cross-sectional area exceeding that of the tungsten wire forming the incandescent body.

Abstract: In an incandescent lamp, comprising a translucent envelope (2) having flattened end (3) of rectangular cross-section, a base element (5) surrounding the flattened end part (3) and having rectangular cross-section, two current lead-ins (7a, 7b) connected with an incandescent body (4) arranged within the envelope (2) and with the base element (5) and thereby with a connecting cable (8), a centering plate (6) with a rectangular opening for receiving the base element (5), wherein the centering plate (6) is made with at least one flange element (10) arranged on the side of the centering plate (6) not facing the envelope (2), the base element (5) being made with thinner plate than the centering plate (6), a locating body (9) stepwisely shaped for receiving the flange element (10) is applied, the locating body (9) made with thinner wall than the centering plate (6) is fixed on the base element (5), has an edge (14) separated from the base element (5) by a gap, wherein the edge (14) of the locating body (9) covers at

Abstract: The soldering enamel is composed of a basic enamel consisting of aluminium oxide and a rare earth metal oxide and/or an alkali earth metal oxide and, in the given case, some other metallic or metalloid oxide, and of a ceramic filling material. The filling material is a zirconium-rare earth oxide of perovskite crystal structure. The quantity of the filling material amounts up to 5 mass % referred to the overall quantity of enamel.

Abstract: In a luminescent material which comprises a first component for luminescing red light under influence of incident optical radiation and a second component for luminescing in the spectral range from 520 to 560 nm, the second component includes a first phase of garnet crystallization system consisted of yttrium aluminate activated by trivalent cerium and determined by the general structural formula Y.sub.3-a Ce.sub.a Al.sub.5 O.sub.12, wherein 0.0003<a<0.1, and a second phase of hexagonal crystallization system of general structural formula La.sub.b Ce.sub.1-b Al.sub.11 O.sub.18, wherein O<b<1, and the second phase is present in an amount ranging from the amounts detectable by means of X-ray diffractometry to the double amount of the first phase.

Abstract: An exhaust head unit for compact fluorescent lamps comprises an exhaust head block, a double rubber seal arranged in the block and serving for the reception of exhaust tubes, a vacuum valve, a gas valve, and a diaphragm for regulating the gas flow, as well as a vacuum duct and a gas duct. The vacuum valve, the gas valve and the adjoining vacuum and gas ducts are all arranged within a single exhaust head block, the diaphragm of the gas flow simultaneously constituting the seat of the gas valve.

Abstract: The invention relates to continuous heat treatment of coiled tungsten filaments wound onto molybdenum cores, in the course of which said filament is passed first through a humid hydrogen atmosphere of about 1300.degree. C. then through a dry hydrogen atmosphere of a temperature of about 1700.degree. to about 1850.degree. C. The method complying with the invention is characterized by transfer times of the coiled tungsten filaments to be heat-treated through heating zones lying in the range of about 3 to about 7 seconds, preferably about 5 seconds, but the duration of passing through the 1700.degree. to 1850.degree. C. high-temperature is at most 7 seconds. The invention also covers the equipment suitable for accomplishing the method, consisting of two high-melting metallic heating tubes, an inventing wheel, a spiral winding/unwinding device, and a temperature sensing and controlling unit.

Abstract: A three-phase high-pressure gas discharge lamp comprising a discharge vessel (1) made of a translucent heat-resistant material. Three electrodes are arranged in the discharge vessel (1), each being fed from a separate phase of a three-phase supply system, each electrode including an electrode tip (7), an electrode stem (5) and an electrode head (6). The electrodes are arrnaged so that their electrode tips (7) occupy the vertices of an equilateral triangle fully enclosed in the discharge vessel (1). The discharge vessel (1) contains a filling consisting of a noble gas, mercury and a further additive selected from the group consisting of preferably sodium and a metal-halide.

Abstract: The ageing process of a low-pressure hot-cathode gas discharge light source, especially a fluorescent lamp is carried out by applying high alternating voltage being at least 8 times and at most 16 times higher than the burning voltage rating of the gas discharge light source after preheating electrodes thereof, whereby a short discharge arc is generated and then after changing the connecting arrangement of the input terminals of the electrodes the application of high alternating voltage is repeated.

Abstract: The invention refers to a projector lamp, which comprises a light source (3), a mirror (1) arranged in a space relationship to the light source (3) for projecting the light emitted by the light source (3) in a predetermined direction, the mirror (1) having a surface determined by a carrier element made of glass or plastics, and a layer system covering the surface of the mirror (1) and including layers characterized by refractive indices alternately at least 2.0 and at most 1.7. The improvement lies in applying layer system including at least four layers (4, 5, 6, 7) prepared for reflecting respective color components of the light emitted by the light source (3). The proposed projector lamp is capable of emitting color light without applying filters.

Abstract: A process for flushing and filling a low pressure gas discharge lamp which has an exhaust tube and discharge electrodes at each of its ends and which is provided with a discharge vessel for limiting or bounding the gas discharge, wherein the course of the process the discharge vessel is coupled via the exhaust tubes to a pumping apparatus. Flushing or fill gas is continually charged into the discharge vessel via one of the exhaust tubes and simultaneously via the other exhaust tube the gas is discharged in such a manner that within the discharge vessel an equilibrium pressure prevails which coincides with the final charging pressure of the lamp, while the flow rate of the flowing gas is expediently maintained at a constant value.

Abstract: The invention relates to a metal-halogen discharge lamp with an alkali-halide additive. The lamp consists of the discharge tube (2), the outer bulb (1), the current leads (3) led into the discharge tube (2) through the outer bulb (1). The discharge lamp according to the invention can be characterized in that the metal components arranged in the outer bulb of the discharge lamp and connected electrically to the mains are separated by a material insulating against alkali ions or alkali ions and electrons.

Abstract: An illuminator, particularly for street lighting and industrial applications, comprising a light source including a gas discharge tube, a closed outer vessel for receiving the gas discharge tube, composed from a rear half part and a front half part for forwarding light of the light source, at least the front half part made of light transparent material, light reflecting means covering partly the inner surface of the rear half part of the outer vessel, mechanical fitting elements and electric connecting means, wherein the front half part and the rear half part both are symmetric to at most two symmetry planes and one of the symmetry planes includes the longitudinal axis of the gas discharge tube and constitutes the symmetry plane of the light emitted by the light source. The proposed illuminator require small place and is hardly subject to contamination originated from the environment.