Abstract: The invention relates to a method of manufacturing a gas discharge lamp and to such a gas discharge lamp 100. A known gas discharge lamp 100 comprises a hollow glass body 120 filled with a gas, which gas is excited into generating light through the supply of energy, and at least one ceramic electrode 140a, 140b fastened to the hollow glass body for the capacitive coupling of energy into the gas inside the hollow glass body 120. It is an object of the invention to simplify the manufacture of the gas discharge lamp 100. This is achieved according to the invention in that the glass material from which the hollow glass body 120 is formed and the ceramic material 140a, 140b from which the ceramic electrode is formed are chosen such that their two thermal expansion coefficients correspond at least by approximation, and in that the glass tube is fastened to the ceramic electrode through direct fusion.

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.

Abstract: A gas discharge tube includes a plurality of light-emitting portions that are provided outside of the tube and comprise at least two discharge electrodes, and an electron emission film formed on the entire inner wall of the tube for improving discharge characteristics.

Abstract: Sputtering of the cathodes of a cold cathode fluorescent lamp is reduced or eliminated by removing electrodes altogether from the sealed envelope containing the gaseous medium. Electric field is then applied by means of electrically conductive members outside the tube. Alternatively, the current passing between electrodes can be spread over multiple sub-electrodes so that the current flow and sputtering experienced by each individual sub-electrode will be reduced. Different designs are employed to facilitate heat dissipation for high power and high intensity cold cathode fluorescent lamp applications. Thus, a container for the fluorescent lamp tube may be omitted altogether and adjacent rounds of a spiral-shaped lamp may be attached together by an adhesive material. Alternatively, the container may be open at one end to facilitate heat dissipation. Or the container for the lamp and the housing from the driver may each contain a hole to allow air circulation to carry away heat.

Abstract: The invention relates to a gas discharge lamp with a gas discharge vessel filled with a filling gas with a filling gas pressure p and at least one capacitive excitation structure. To improve the luminous efficacy of the gas discharge lamp, it is suggested that an electrode of a dielectric material forms at least one capacitive excitation structure, which electrode is connected to the gas discharge vessel and encloses at least one hollow space with a surface area A and a volume V, for which it is true that p·V/A<10 cmTorr. Such a dielectric or capacitive electrode, according to the invention, is shaped such that it has a hollow space which is closed off in a vacuumtight manner except for a communication to the gas discharge vessel. It has a surface area A on the inside of the electrode and surrounds a volume V. The dimensions of the hollow space are such that p·V/A<10 cmTorr, the filling gas pressure p being given in Torr.

Abstract: The invention relates to improvements in high-pressure discharge lamps of the ceramic metal halide type of the Philips MasterColor series having a metal coil wrapped around the discharge vessel and/or at least a portion of the electrode feed through means, and having power ranges of about 150W to about 1000W, wherein the lamp has a metal coil wound around the discharge vessel and/or at least a portion of the electrode feed through means in a first position and in which metal coil the coil position of at least one coil portion, preferably multiple coil portions, and most preferably substantially all of the coil portions of the metal coil are stabilized to be substantially non-relaxed from the first position after exposure to elevated temperature conditions present during operation of the lamp. The metal coil functions as both an ignition aid and for containment in said lamp.

Abstract: The invention relates to a high-pressure discharge lamp of the ceramic metal halide type of the Philips MasterColor series having a molybdenum coil wrapped around the discharge vessel and at least a portion of the electrode feed through means, and having power ranges of about 150 W to about 1000 W. Such lamps are provided with a discharge vessel which encloses a discharge space. The discharge vessel has a ceramic wall and is closed by a ceramic plug. An electrode which is located inside the discharge space is connected to an electric conductor by way of a leadthrough element. The leadthrough element projects through the ceramic plug with a close fit and is connected thereto in a gastight manner by way of a sealing ceramic. The leadthrough element has a first part which is formed by a cermet at the area of the gastight connection.

Abstract: An electrodeless discharge lamp includes a pair of opposed couplers aligned along an axis, a stationary light transmissive envelope positioned between the pair of opposed couplers, the envelope having an interior length along the axis which is greater than a maximum interior dimension of the envelope orthogonal to the axis, a light emitting fill disposed inside the envelope, the fill including at least one fill substance selected from the group of sulfur, selenium, and tellurium in a concentration of at least 1 mg/cc for each selected fill substance, and a power source connected to the couplers, wherein power applied to the couplers from the power source is effective to initiate and sustain a stable light emitting discharge from the fill. For example, the envelope may be capsule shaped or have the shape of a prolate ellipsoid. The lamp operates at low power and is stable without rotation.

Abstract: The invention relates to the capacitive modulation of the field distribution in a silent discharge lamp 1, by means of a structured, electrically conductive device 2 for definition of preferred locations for discharge structures in the lamp 1.

Abstract: A gas discharge lamp has at least one capacitive electrode of a dielectric material having a dielectric saturation polarization P and an effective surface A wherein the product of P·A>10−5 C. This lamp can be operated without drive electronics or a ballast, using power available at private households.

Abstract: An arc discharge lamp comprising an arc tube comprising a starting aid is provided. The starting aid comprises a coating on the surface of the arc tube. The coating is comprised of metal oxide, nitride, carbide, silicide, and mixtures thereof.

Abstract: A gaseous-discharge lamp, in particular for motor-vehicle headlamps, includes a burner vessel made of glass or the like that contains a gas. Into this burner vessel extend two main electrodes via two gas-tight electrode bushings. Between the end regions of the main electrodes arranged in the burner vessel, an arc gap is formed, along which an electric arc develops during operation. To achieve a smallest possible ignition voltage, an arrangement is provided for producing a creepage spark gap along the inner vessel wall and/or a spark gap that is shorter than the arc gap, serving as an ignition gap that is spatially separated from the arc gap.

Abstract: An apparatus and method are disclosed for an open chamber photoluminescent lamp. The photoluminescent planar lamp is gas-filled and contains photoluminescent materials that emit visible light when the gas emits ultraviolet energy in response to a plasma discharge. The lamp comprises first and second opposing plates manufactured from a glass material having a loss tangent ≦0.05%. In another embodiment the first and second plates have a dielectric constant greater than 5. In yet another embodiment, the first and second plates have a volume resistivity greater than 1×1012 &OHgr;cm.

Abstract: At the outer boundary of a discharge container 1, a pair of opposed electrodes 3a and 4a and a pair of opposed electrodes 3b and 4b are disposed with a specified spacing being given between them, and to each pair of opposed electrodes, a high-frequency voltage is applied from a high-frequency, high-voltage power supply 8 through a limiting resistor 6a, 7a, and a limiting resistor 6b, 7b. Across each pair of opposed electrodes, a steamer of discharge plasma corresponding to the amperage of the discharge current is generated, however, by adjusting the resistance value of the above-mentioned limiting resistor 6a, 7a, and the resistance value of the limiting resistor 6b, 7b, the discharge current is appropriately set, and thus the streamers of discharge plasma generated across the pairs of opposed electrodes are made uniform.

Abstract: An electrodeless compact fluorescent lamp operated at a frequency from 50 KHz to 1000 KHz and RF power from 10 W to 40 W is described. The lamp includes a bulbous glass envelope (1) filled with rare gas and metal vapor, reentrant glass cavity (2), an induction coil (6) made from Litz wire, a ferrite assembly comprising a ferrite core (7) and MnZn ferrite disk (11), a cooling structure comprising a metal (or ceramic) tube (8) positioned inside the ferrite core (7) and a metal (or ceramic) unit (9) that transmits the heat from the cavity and ferrite assembly to the Edison socket (10), a thermal shield (12), and a driver and matching network located inside the lamp base (13). A protective coating (15) and phosphor coating (16) are coated on the inner surface of the envelope (1) and reentrant cavity (2). The reflective coating (17) made from alumina is coated on the inner surface of the cavity (2) and on the outer surface of the envelope bottom (4).

Abstract: An inductively coupled high-frequency electron source is disclosed having a plasma chamber, which is open at least at a first end, the total surface of the open regions of the plasma chamber defined by Ao, and having a gas inlet for a gas to be ionized, as well as a high-frequency coil. The interior wall of the plasma chamber is formed at least partially by conductive regions which are connected with a current source, the total surface of the conductive regions defined by Ac, and the ratio of the surface amounts Ao to Ac not exceeding a defined maximal value.

Abstract: The present invention provides a DBD lamp used in fluid treatment systems, where the irradiated fluid is used as a low voltage outer electrode instead of a metallic wire mesh. This fluid is in direct contact with the lamp envelope which acts as a two-fold advantage. First, the fluid acts as a strong built-in cooling source. This allows the lamp to be driven at high voltage without forced cooling. Second, the replacement of the wire mesh as the outer electrode by fluid as well as the sleeve eliminates the absorption of radiation from the outer surface of the said DBD-driven light source which more than doubles the efficiency of the DBD-driven light source. The inner high voltage electrode remains in the center of the coaxial tube assembly and provides high voltage across the gas to generate excimer formation.

Abstract: An elongated gas-discharge lamp having a controllable illuminated length may be formed with a dielectric barrier discharge, in which the position of a discharge voltage is dependent, for example, on a discharge gap 6′ which varies over the length of the lamp 1′. The varying discharge gap allows, for example, bar displays or quantitative brake warning lights to be provided.

Abstract: In a conventional electrodeless discharge lamp, a large amount of magnetic field leaks from at light-transparent envelope, and the efficiency of conversion from electric power to light energy is low. In a electrodeless discharge lamp in which light-emitting gases in a light-transparent envelope are excited with a magnetic field generated from a coil, end portions of a magnetic material included in the coil are substantially axially disposed in the light-transparent envelope. As a result, the magnetic flux which leaks outside the light-transparent envelope is decreased so the density of the magnetic flux in the envelope is increased and the efficiency of the lamp is improved.

Abstract: An electrodeless fluorescent lamp operating at relatively low frequencies (50-500 kHz) whereby a ferrite core is utilized to generate the necessary magnetic and electric fields to maintain the discharge where the core material is Mn—Zn type combination due to its low power losses, 400 mW/cm3, in the frequency range of 50-100 kHz and magnetic field strengths of 150 mT. Furthermore, the material may cover a variety of atomic percentages of Mn and Zn added to Fe2O3 base to obtain favorable grain boundary and crystalline structure, resulting in a practical ferrite core material, having a Curie temperature greater than 200° C. Such material enables the operation of electrodeless fluorescent lamps with powers ranging from 10 W to about 250 W at low frequencies, as mentioned above, in such a manner that ferrite core losses constitute less than 20% of the lamp power and heat generated by core losses is minimized.

Abstract: The present invention provides a DBD light sources having flat-plate, large-area panels and a system for designing such DBD light sources that withhold the mechanical stress caused during the lamp envelope cleaning (evacuation at elevated temperatures) and the pressure of final gas filling (if other than atmospheric). One or more embodiments of the present invention place mechanical stems inside of the lamp envelope which greatly reduce the mechanical stress at the sealing surface, as well as over the entire large area panel surface. In one embodiment, the stems are arranged so that they are equidistant. This design enables the mechanical stability of the lamp envelope during the cleaning (vacuum) process, as well as the filling of the lamp envelopes at other than atmospheric gas pressure.

Abstract: The device for disinfecting water comprises a gas discharge lamp including a discharge vessel with walls composed of a dielectric material, which walls are provided on their outer surfaces with at least a first and a second electrode, and which discharge vessel contains a gas filling containing xenon, the inner surface of the walls being at least partly covered with a coating containing a phosphor emitting in the UV-C range. Such a device for disinfecting water can always be made 100% operation within milliseconds, and the UV-radiation of the device has a spectral composition which lies exclusively in the range relevant for disinfecting, i.e. between 230 and 300 nm.

Abstract: Disclosed is a dielectric barrier excimer lamp which is easy to handle, less expensive and improved in ultraviolet light beam irradiation efficiency to electric power and ultraviolet light beam irradiation efficiency to a work.

Abstract: An inductively driven gas discharge lamp assembly (20,40) which includes an electrodeless lamp (12,12′), an inductive drive coil (14), and a flux concentrator (22,42) disposed about the drive coil. The drive coil (14) is wound about the lamp (12,12′), which has a neon or other ionizable gas fill that provides a visible plasma discharge upon energization by the drive coil. The flux concentrator (22,42) can comprise a sleeve (24,44) of magnetically permeable material, such as ferrite, which confines the magnetic field generated by the drive coil (14). The flux concentrator (42) can include an end piece (46) that further confines the magnetic field at one end of the drive coil and c include a core piece (48) that extends into a central recess (50) within the lamp (12′) to concentrate the magnetic flux at a particular region within the lamp where the plasma discharge is primarily located.

Abstract: A dielectric barrier discharge lamp with a translucent part made of silica glass which contains OH radicals and in which damage of the silica glass by UV radiation can be suppressed and a sufficient amount of UV radiation can be obtained in a dielectric barrier discharge lamp, in which a silica glass discharge vessel is filled with a discharge gas which forms excimer molecules by a dielectric barrier discharge and which is at least partially provided with a translucent part, by the translucent part having a ratio of non-hydrogen bonding OH radicals to the total number of OH radicals which is less than or equal to 0.36.

Abstract: A luminescence controlling apparatus includes a rare gas pipe equipped with a pair of electrodes in which rare gas is sealed, a power supply for impressing voltage to the pair of electrodes and an electric charge absorption member for absorbing electrons generated during electric discharge of the rare gas pipe caused by impressing voltage to the pair of electrodes. The absorption member is disposed in the rare gas pipe. The luminescence controlling apparatus further includes a controller for controlling a luminescence amount of the rare gas pipe by adjusting a quantity of electrons absorbed by the electric charge absorption member.

Abstract: A discharge lamp having a discharge space is bounded by an external tube formed of dielectric material and by an internal tube formed of dielectric material. An external electrode is arranged proximate the external tube, and an internal electrode rests against the internal tube. The internal electrode is formed from an elastic spiral band having an external diameter that is greater than the internal diameter of the internal tube when the elastic spiral band is not compressed.

Abstract: A liquid crystal display is formed by a liquid crystal display panel for modulating light to form an image, and a back light unit including a lamp tube which is discharged by an electrode and is disposed behind said liquid crystal display panel, wherein said electrode is formed outside of said lamp tube. In this way, the liquid crystal display unit has a life span which can be increased without the need to replace the lamp tube or the back light unit.

Abstract: A discharge lamp (1) including a tubular discharge vessel (2), filled with inert gas and, optionally, a fluorescent layer, having at least three elongated electrodes (3, 4, 5) arranged parallel to the longitudinal axis of the tubular discharge vessel (2). The electrodes are arranged in such a manner that the relationship s a ≥ 0.1 is satisfied, wherein s is the maximum spacing between an imaginary connecting line of an electrode pair and the most closely neighboring point on the wall of the tubular discharge vessel, and a is the mutual spacing between the electrodes of such electrode pair. A higher luminous density is achieved in this way. The lamp is particularly advantageous for a pulsed, dielectrically impeded discharge.

Abstract: The present invention is directed to a dielectric barrier discharge lamp capable of recovering reduced radiation efficiency by easily, quickly cleaning dust or discoloring of a discharge tube or replacing any defective discharge tube. For this end, an internal electrode 22 in a form of electrically conductive rod is inserted into a center hole of a dual discharge tube 20 having discharge gas filled in an internal space 21. Holders 40a and 40b are removably mounted on both ends of the internal electrode 22 using mounting screws 41. A protection tube 30 is mounted onto the holders 40 by way of sealing members 31, pressure blocks 32 and pressure rings 33 in such a manner to cover an external electrode 23 of the discharge tube 20. Cooling water or the like may be permitted to flow in a continuous space 45 formed between the internal electrode 22 and the discharge tube 20 and the holders 40.

Abstract: A discharge lamp (1) having an electrically conducting screen (12, 13) which at least partially surrounds the discharge vessel (2). The electrodes (3-5) are separated from the interior of the discharge vessel (2) by a dielectric barrier (6-8). Moreover, this screen (12, 13) is electrically separated from the electrodes (3-5) by a dielectric (2). In order largely to prevent the electric power fed to the lamp electrodes (3-5) during operation from being capacitatively coupled to the electrically conducting screen (12, 13), the thickness dB and the dielectric constant ∈D of the dielectric (2), as well as the thickness dB and the dielectric constant ∈D of the barrier (6-8), which separates the electrodes (3-5) from the gas filling, are specifically mutually coordinated such that the following relationship is fulfilled: d D ϵ D ≥ 1.

Abstract: A bulb comprises an airtight envelope having a filling gas therein. A conductive wire extends outwardly from the airtight envelope. A conductive pipe pin has the conductive wire passed therethrough, a predetermined welding portion, and a welded portion including a smooth surface. An outer diameter of the welded portion is no greater than the outer diameter of the pin. The welded portion may be formed in the pipe pin by the fluid of the melted conductive wire and predetermined welding portion flowing into the pipe pin and hardening.

Abstract: Lighting apparatus includes a dielectric barrier discharge lamp having a discharge vessel enclosing a discharge space having a filling, first and second main electrodes, a dielectric sheet between the first main electrode and the discharge space, and a first circuit part for generating an operating voltage between the main electrodes. A plurality of electrode bodies mounted in or on the dielectric sheet form an auxiliary electrode, and a second circuit part generates auxiliary voltages between the electrode bodies for generating an auxiliary discharge in the discharge space.

Abstract: The present invention is designed to provide a high intensity light irradiation apparatus having a simpler, lighter, easy to assemble and replace support member for a dielectric barrier electrical discharge lamp. The dielectric barrier electrical discharge lamp 1 comprises concentric outer tube 11 and inner tube 12 to form an inert gas filled electrical discharge space 14 defined by the outer and inner tubes 11,12 and their end walls. A metal rod 3 is inserted into the inner tube 12 of the electrical discharge lamp 1. A pair of clamp members 4 are secured to both ends of the metal rod 3 for clamping the both ends of the electrical discharge lamp 1. An AC voltage is applied between the metal rod 3 and an outer electrode 21 on the surface of the outer tube 11. Cooling water flows through the gap between the metal rod 3 and the inner tube 12.

Abstract: A dry cleaning device which uses a double-cylinder type dielectric barrier discharge lamp 10a, 10b as a ultraviolet source. An outside electrode 2 in a trough-like shape is tightly contacted with the outer tube 1a of a discharge container 1, reflecting the ultraviolet light and directs it toward a workpiece 40. A cover 3 covers the outside electrode 2 for insulation of the outside electrode 2 from the ozone. In the clearance between the outer tube 1a of the discharge container 1 and an N2 introduction tube, an inside electrode 6 in a net-like shape is accommodated, nitrogen (N2) gas is caused to flow through the clearance for cooling the lamp 10a, 10b.

Abstract: An electrodeless fluorescent lamp comprises a glass closed-loop envelope filled with inert gas and mercury vapor at pressure of 0.1-5 torr. An induction coil of few turns and made from Litz wire is disposed on the outer surface of the lamp inside of the closed-loop envelope. A phosphor coating is disposed on the inner surface of the envelope surface and a reflective coating is disposed on the inner surface of the area adjacent to the induction coil.

Abstract: The high-pressure discharge lamp comprises a discharge vessel provided with a first and a second lamp electrode, an outer envelope which surrounds the discharge vessel with space and which is provided with a lamp cap. A tube-like UV enhancer having a longitudinal axis is provided in the space having a ceramic wall and provided with an internal enhancer electrode connected to the first lamp electrode and by way of a capacitive coupling connected to the second lamp electrode, and which enhancer electrode has an end inside the enhancer. The capacitive coupling is formed by a metal curl positioned around the UV enhancer in a plane perpendicular to the longitudinal axis of the UV enhancer and close to the end of the enhancer electrode. The lamp shows on ignition with a relative small ignition voltage only a very small ignition delay.

Abstract: In an anode-side assembling process, a first end of a glass tube is fused to a rearward end of an electrode bar secured to an anode-side lead to produce a primary sealed product. In a cathode-side assembling process, a ring-shaped cathode is secured by caulking to a forward end portion of an electrode bar secured to a forward end of a cathode-side lead to produce a cathode member. In an assembling process, a second end of the glass tube of the primary sealed product is fused to a rearward end of the electrode bar secured to the cathode-side lead of the cathode member to produce a xenon discharge tube. A trigger electrode, which is composed of a transparent conductive film, is formed on a surface of the glass tube so that the light-transmissive sealed tube-coating ratio specified by the transparent conductive film is within a range of 5 to 30%.

Abstract: An electrodeless gas discharge lamp includes a light-transmissive envelope having opposite ends and a midsection about which an induction coil is disposed. The envelope and coil are mounted transversely on a base with the ends of the envelope exposed such that light emitted from the envelope is transmitted through both ends of the envelope substantially unobstructed by either the base or coil to generate a high total light output of the assembly.

Abstract: An electrodeless lamp (10) for producing an intense beam of light includes a concave lamp body (11) that surrounds the lamp interior. A gas, such as sulfur or selenium or compounds thereof, is contained within the lamp body (11) for forming a plasma light source. The concave lamp body (11) has a reflecting surface (12). Electrodes (27, 28) are disposed external to the lamp body for producing radio frequency energy exciting the gas. A heat resistant glass plate (20) seals the concave lamp body (11). A frit seal (23) can be used for forming a pressure and temperature resistant seal between the concave lamp body (11) and the glass plate (20). The light beam generated by the plasma exists through the glass plate (20).

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 provides the high-intensity discharge lamp and the high-intensity discharge lamp lighting system and the lighting system using the high-intensity discharge lamp showing the low enough starting voltage. The high-intensity discharge lamp comprising a lighting-source bulb provided with an enclosure, a light-transmissive ceramic enclosure defining a pair of small diameter cylinders communicating with the enclosure at both ends thereof, a pair of electrodes and discharge agent, a metallic coil which is wound on the outside surface of at least one small-diameter cylinder and coupled to the other end of the electrode to have the same potential with the electrode, a jacket-bulb which hermetically accommodates therein the lighting-source bulb and the metallic coil, and a pair of outer lead terminals which are coupled to the pair of electrodes and hermetically led outside the jacket-bulb.

Abstract: An arc discharge lamp body made from a material selected from glass and ceramic materials and defining a discharge space; an arc generating and sustaining medium contained within said discharge space; and an electrically conducting member in at least one end of said body and extending both interiorly and exteriorly thereof, said electrically conducting member being formed of an electrically conductive ceramic material having a thermal coefficient of expansion substantially matching that of said body.

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: An arc tube for a discharge lamp comprises an hermetically sealed hollow body containing an arc generating and sustaining medium therein and having first and second ends. An electrode receiving capillary extends from each end and an electrode structure is positioned in each of the capillaries. Each of the electrode structures comprises a proximal, electrode end projecting into the interior of the hollow body, a distal end projecting exteriorly of the capillary, and an intermediate section therebetween, a first area of the intermediate section being sealed to the capillary in an hermetic manner and a second area of the intermediate section being exposed to the medium. A starting aid comprises an electrically conducting member surrounding the capillary extending from the first end at the second area of the intermediate section and is electrically connected to the distal end of the electrode structure positioned in the second end.

Abstract: An electrodeless lamp has a gas containing chamber with a first electrode and a second electrode, each surrounded by a dielectric, within the gas chamber and an AC source coupled between the first and second electrodes. In another aspect, the electrodeless lamp has a gas containing chamber with a dielectric chamber wall, a first electrode extending along the dielectric chamber wall outside of the gas containing chamber, a wound second electrode surrounded by a dielectric within the gas chamber, and an AC source coupled between the first and second electrodes.

Abstract: Discharge lamp includes a ceramic metal halide lamp having a central barrel enclosing a discharge space containing a fill gas and opposed end plugs which receive electrode lead-ins therethrough. A conductive ring is provided around each end plug, which is preferably polycrystalline alumina (PCA). These rings are connected by an antenna on the central barrel and thereby capacitively coupled to the lead-ins. The rings and the antenna are preferably sintered tungsten which is coated on the arc tube in paste form prior to sintering. When a voltage is applied across the electrodes, the resulting electric field causes the PCA to emit UV radiation which stimulates photoelectrons to initiate a discharge in the fill gas.

Abstract: A sealed, metal oxide, electrodeless discharge lamp having a high emission ntensity in the visible 400-700 nm range. Within the sealed container assembly of the lamp there is a source of metal atoms capable of forming a volatile oxide and a source of an oxygen containing gas. The lamp produces a plasma and volatilizes the metal into the plasma. Preferably the lamp is at a low pressure of about 20-40 torr and the metals are molybdenum or tungsten. Power is applied by inductively coupled electromagnetic radiation. A regenerative agent such as a halogen is added for recycling any deposited metal into the gas phase and to form a volatile compound with the source of metal atoms. The agent lowers the temperatures needed to volatilize the metal into the plasma. The lamp is operated by first providing energy at a low level to initiate the plasma and then supplying the metal atoms into the plasma.

Abstract: A noble gas discharge lamp of the present invention comprises an outer enclosure comprising a light emitting layer comprising at least one fluorescent substance, the light emitting layer formed therein and a pair of outer electrodes having tape shapes comprise a metal, which are adhered to the entire length of the outside of the outer enclosure so as to separate one outer electrode and the other outer electrode at a certain distance, and to form a first opening portion and a second opening portion; wherein the coated amount of fluorescent substance is in a range of 5 to 30 mg/cm.sup.2.

Abstract: A lampholder in accordance with the invention can suitably be used for a low-pressure discharge lamp (a) which operates at a high frequency and which comprises an elongated, tubular discharge vessel (b), said lamp being provided with a pair of electrodes (c, c') for maintaining an electric discharge in the discharge vessel. The lampholder (0) has contacts (1, 1') for connecting a high-frequency power supply (4), said contacts being electrically connected to a first (2) and a second terminal (2') for connecting the lamp. The second terminal is further removed from the contacts than the first terminal. A compensation conductor (6) extending between the first (2) and the second terminal (2') is connected to said first terminal (2). This leads to a reduction of conducted interference.