Abstract: A circuit arrangement is disclosed with a regulating circuit which is particularly used for regulating a resonant converter having a plurality of outputs. The arrangement includes a protective circuit that can be constructed with the least possible circuitry and cost. The regulating circuit is used for generating a pulse-width modulated regulation signal (20) in dependence on measuring signals (Va, Vb) present on inputs of the regulating circuit (20). The arrangement further includes a comparator circuit (212) for comparing the duty cycle (?) of the regulation signal (20) with a predefinable maximum duty cycle value (?max) and minimum duty cycle value (?min), in which in case of a duty cycle (?) situated outside the range between the maximum duty cycle value (?max) and the minimum duty cycle value (?min) the circuit arrangement delivers control information that corresponds to this exceeding of the range.

Abstract: A multichip wirebond-less integrated circuit and power die package is based on a folded single-layer flex circuit. The package is formed with metal-studbumped power dies and IC's flipchiped to a patterned flex substrate. Extensions of the flex substrate are folded and attached to the backside of the dies for electrical and/or thermal contact. I/O pins are along the periphery of the package for standard SMT mounting while heatspreaders are attached to both sides of the package for double-sided cooling.

Abstract: A low-pressure gas discharge lamp comprising a discharge vessel and at least two, spatially separated, capacitive induction structures, the vessel having a relatively small diameter of preferably 5 mm or less and comprising cylindrically shaped tubular induction structures of a dielectric material. An external induction plate of the capacitive induction structure acts as an electric contact and is shaped as a bush and is made from electrically conducting, ductile metallic material. The bush is provided on and is in direct contact with the dielectric material of the cylindrically shaped tubular induction structure. It is ensured that the connection thus formed is gastight and has a permanent compression stress, for example, a shrink connection.

Abstract: An electric lamp has an envelope with an inner surface and two electrodes located at each end of the envelope. The electrodes transfer electric power to generate ultraviolet radiation in the envelope which is filled with mercury and a charge sustaining gas. The inner surface of the envelope is pre-coated with an aluminum oxide layer to reflect ultraviolet radiation back into the envelope. A phosphor layer is formed over the aluminum oxide to convert the ultraviolet radiation to visible light. The phosphor layer is a mixture of four phosphors, namely, blue-luminescing Blue Halophosphate (BH), red-luminescing Yittrium Oxide (YOX), 2900K-luminescing Calcium Halophosphate, also referred to as Warm White Halophosphate (WW), and green-luminescing Zinc Silicate (ZS).

Abstract: An incandescent lamp comprising a glass bulb (3) of tubular shape in which a filament (4) is axially arranged. The end is hermetically sealed by means of a pinch (5) applied around a metal foil (1) to which an outer current lead (7) and an inner current lead (6) electrically connected to the filament are fixed. A second, intermediate flat foil (2) is connected directly to the end (9) of the filament, between the latter and the inner current lead (6), and the bulb is elbowed at the level of said second flat foil (2).

Abstract: A headlamp (2; 3) of a vehicle (1) has a light source (4; 5) comprising a plurality of opto-electronic elements (11; 12; 13; 14), preferably light-emitting diodes (LED's). At least one of these opto-electronic elements (11; 12; 13; 14) has, in operation, a luminous flux of 5 lm or higher. According to the invention, the spectral characteristic of the light beam (6, 6′; 7, 7′) generated by the light source (4; 5) depends upon the position in the light beam (6, 6′; 7, 7′). Preferably, the light source (4; 5) comprises opto-electronic elements (11; 12; 13; 14) only. The light beam comprises at least two light beam segments (6, 6′; 7, 7′) having essentially different spectral characteristics. Preferably, one of the light beam segments (6′; 7′) is mesotopically tuned.

Abstract: An auxiliary antenna arranged around the discharge vessel of a gas discharge lamp comprising an outer bulb enclosing this discharge vessel is provided on the outer bulb. The advantages of an auxiliary start antenna can thus be enjoyed without being counterbalanced by an increased sodium diffusion.

Abstract: Precision measuring apparatus like Co-ordinate Measuring Machines (CMMs) are very susceptible to deformations due to temperature variations and gradients. In a known CCM such variations are counteracted by providing parts of the apparatus with an insulating PUR layer. According to the invention the metrology frame 2 of the measuring apparatus is provided with a heat shield 12, 15 which includes an inner layer 12, having a comparatively high heat resistance, and an outer layer (14) which has a comparatively low heat resistance. Temperature gradients causing deformations of the metrology frame 2 are thus effectively reduced, whereas homogeneous temperature variations can be easily compensated for by means of software correction. Moreover, the shield acts as a low-pass filter which reduces the temperature disturbances due to short-term heat inputs.

Abstract: A system of a first luminaire (1) and a second luminaire (11) for lighting an object (V). Each luminaire has a housing (2; 12) provided with a plurality of tubular lamps (3, 3′, 3 ″; 13). The housing (2; 12) has a light emission window (4; 14) and a side wall (5, 5′; 15) which is perpendicular to the light emission window (4; 14). In the system, the first and the second luminaire (1; 11) abut one another with their side walls (5, 5′; 15) and/or with their light emission windows (4; 14), such that an edge (6) of the light emission window (4) of the first luminaire (1) abuts an edge (16) of the light emission window (14) of the second luminaire (11). Said light emission windows (4; 14) and said side walls (5, 5′; 15) are made from an optically transparent material. Preferably, the light emission window (4; 14) is provided with a diffusor (7; 17).

Abstract: The invention relates to a bulb designed for emitting radiation through an emission surface ES of an envelope ENV which contains a radiation source ELM. According to the invention, the emission surface ES is substantially planar, while the radiation source defines a planar surface parallel to the emission surface. A bulb according to the invention is capable of emitting a homogeneous radiation towards a planar surface with a high radiation density.

Abstract: A headlamp (2; 3) of a vehicle (1) has a light source (4; 5) comprising a plurality of opto-electronic elements (11; 12; 13; 14), preferably light-emitting diodes (LED's). At least one of these opto-electronic elements (11; 12; 13; 14) has, in operation, a luminous flux of 5 lm or higher. According to the invention, the spectral characteristic of the light beam (6, 6′; 7, 7′) generated by the light source (4; 5) depends upon the position in the light beam (6, 6′; 7, 7′). Preferably, the light source (4; 5) comprises opto-electronic elements (11; 12; 13; 14) only. The light beam comprises at least two light beam segments (6, 6′; 7, 7′) having essentially different spectral characteristics. Preferably, one of the light beam segments (6′; 7′) is mesotopically tuned.

Abstract: The electric lamp has a light source (20) in an outer bulb (21). The light source (20) is secured in an envelope (1) by means of an insulator body (40) in which current connection conductors (43) are integrated and which is present in a lamp cap (10) of the reflector lamp. The lamp cap (10) is mechanically connected to a neck portion (5) of the envelope (1). The integrated insulator/current connector body (40, 43) enables electrical contacting, fixation, and mechanical adjustment of the light source (20) in the envelope (1).

Abstract: Metal halide lamps are disclosed having a discharge vessel with a ceramic wall. The discharge vessel encloses a discharge space comprising an ionizable gas filling and, in addition to Hg, an alkali iodide of Na or Li or a combination of both. The filling also includes TbI3 or GdI3 or a combination thereof.

Abstract: A metal halide discharge lamp has an ellipsoidal outer envelope with a quartz glass arc tube on its major axis supported by a frame having metal straps engaging pinched ends of the arc tube, which lie in a common pinch plane. An inert gas fill between the arc tube and the envelope establishes convection flow patterns during operation. Getters in the form of strips of ZrAl alloy are welded to the straps at 45° to the pinch plane on opposite sides thereof. The getter orientation improves absorption of impurities during horizontal lamp orientation, so that hydrogen spikes and other problems are eliminated.

Abstract: The invention relates to a metal halide lamp provided with a discharge vessel having a ceramic wall, which vessel encloses a discharge space in which an electrode is positioned. The discharge vessel is closed off by a plug in which a lead-through element is sealed in a gastight manner by means of a sealing ceramic. The lead-through element forms an electrical connection from the electrode inside the discharge vessel to a current supply conductor outside the vessel. According to the invention, the lead-through element has a ceramic core which is sealed to the plug in a direct joint in a gastight manner by means of sealing ceramic. The core is provided with a metal envelope at either side of the direct joint, which envelopes are interconnected by a small metal strip.

Abstract: The present invention relates to an improved maintenance, low-pressure mercury vapor discharge lamp having a discharge vessel enclosing a discharge space provided with a filling of mercury and a rare gas in a gastight manner. The discharge vessel is made from a glass of essentially 60-80% by weight SiO2 and 10-20% by weight Na2O. Preferably, the composition of this so-called sodium-rich glass is made of 70-75% by weight SiO2, 15-18% by weight Na2O and 0.25-2% by weight K2O. At least a part of the inner surface of the discharge vessel is provided with a transparent layer having a borate or a phosphate of an alkaline-earth metal and/or of scandium, yttrium or another rare earth metal. Preferably, the alkaline-earth metal is calcium, strontium and/or barium. In a particularly preferred embodiment, the transparent layer is made of yttrium borate and strontium borate. Additionally, the transparent layer preferably has a thickness between 5 and 200 nm and has provided on it a luminescent layer.

Abstract: The low-pressure gas discharge lamp has a tubular lamp vessel (1) provided at both of its ends (12) with a lamp cap (4) having contact pins (5). Each lamp cap (4) is fixed in an adapter (6) which, depending on the embodiment chosen, has a certain number of external contact points (7) electrically connected to at least one of the contact pins (5) of the lamp cap (4). Thus the low-pressure gas discharge lamp has the possibility of being connected to various connector buses.

Abstract: The electric discharge lamp comprises a shell (1) having an axis (2), which shell accommodates a starter (3) and pin-shaped contacts (4) extending in an axial direction. A cover (27), which is coupled to a discharge vessel (20), is attached to the shell (1). Pairs (23) of current conductors (24) emanate from the discharge vessel (20). The conductors (24) of each pair (23) are clamped, in a direction transverse to the axis (2), by first and second (6) forked contact elements, which are secured in the shell (1) and are directed towards the cover (27). The lamp is of a simple construction, which can be readily produced.

Abstract: The invention relates to a device for connecting the plug-in base (5) of a side-mounting luminaire to a carrier tube (3), in particular to the tube (3) of a luminaire mast, it being possible for the plug-in base (5) of the side-mounting luminaire to be connected to the carrier tube (3) and to be fixed to the carrier tube (3) by means of a securing element (15) which can be inserted into the side-mounting luminaire from the outside inward, and it being possible for the securing element (15) to be pressed against an abutment which effects clamping. The securing element (15) cooperates with a clamping device (10) which, when the securing element (15) is inserted into the tube interior (12), converts the clamping force directed away from said element into the tube interior (12) into a clamping force directed outward from the tube interior (12), the clamping device (10) pressing a clamping member (11b) against the inner wall (17) of the carrier tube (3), which wall acts as the abutment (16).

Abstract: The luminaire comprises a concave reflector (1) with an optical center (2) on an optical main axis (3), in an optical main plane (4). A screen (6) extends along the main axis (3) up to a light emission window (5). A panel (7) extends at a first side of the main plane (4) from the screen (6) up to the light emission window (5). The reflector (1) includes a first, faceted reflector portion (10) at the first side of the main plane (4), which extends towards the main plane (4), and which may be parabolically curved, the optical center (2) being its focus and the main axis (3) being its axis. A second, faceted reflector portion (20) is present at the other side of the main plane (4) and may be parabolically curved, which reflector portion has a side axis (22) passing through the optical center (2), and a focus lying in the optical center (2). The side axis (22) is tilted, with respect to the main axis (3), through acute angles in the main plane (4) and out of said main plane (4).