Abstract: A discharge lamp with a cast base has two electrodes for feeding power into the discharge vessel, two current feeds for making contact with the electrodes from the outside and a lamp base with a recess for receiving one end of the discharge vessel. In this context, one end of the discharge vessel is introduced into the recess in the lamp base. Between the lamp base and the discharge vessel there is an intermediate space. The current feeds are located at least partially within the intermediate space. This intermediate space has been cast with a sealing compound so that the sealing compound fills at least part of the interspace and encloses the end of the discharge vessel in such a way that the current feeds of the discharge lamp are sealed off from the outside in so far as being located within the lamp base.

Abstract: A tungsten alloy feedthrough for ceramic discharge vessels is used to form a hermetic seal with the ceramic body of the discharge vessel. The tungsten alloy comprises tungsten alloyed with a metal selected from titanium, vanadium or a combination thereof. The alloy may be formulated to have a coefficient of thermal expansion that closely matches that of the ceramic to prevent cracking. Preferably, the tungsten alloy contains from about 10 to about 35 wt. % of a metal selected from Ti, V, or a combination thereof.

Abstract: A branch portion of a socket is formed into a thin cylindrical shape so that it can be elastically displaced, end faces of both side plates of a lamp reflector are made to be points for positioning, positioning protrusions are integrally protruded from both side outer end edge portions of each socket body, under the condition that a substantially L-shaped through-passage of each socket is externally engaged with each lead wire, an end portion of each lead wire is brazed to both end portions of a straight-pipe-shaped light source, when each socket is slid along each lead wire, each socket covers a region from the end portion of each lead wire to the end portion of the straight-pipe-shaped light source, and each socket body is inserted into a lamp reflector so as to make a positioning protrusion come into contact with a positioning point.

Abstract: A hermetically sealed lamp having at least one end-to-end seal. The end-to-end seal may be a material diffusion bond, a seal-material bond, or any other suitable bond. For example, the hermetically sealed lamp may have one or more endcaps butt-sealed to an arc envelope, such as a ceramic tube or bulb. The hermetically sealed lamp also may have one or more tubular structures, such as dosing tubes, which are butt-sealed to the endcap and/or arc envelope. Localized heating, such as the heat provided by an intense laser, also may be used to enhance any of the foregoing bonds.

Abstract: A lamp is provided having terminal pins mounted on and extending outwardly along a longitudinal axis of an end cap of the lamp. The pins are offset relative to one another along the longitudinal axis. The end cap has semi-circular, parallel surfaces with an asymmetrical section or recess at one end, and the pins extend outwardly from the respective semi-circular, parallel surfaces. A barrier wall extends substantially perpendicularly between the semi-circular surfaces.

Abstract: A light source includes a lamp and housing. The housing has a right-angle form with a first leg for the lamp, a second leg for connecting leads for the lamp and a jointure between the legs having an aperture allowing access to the connecting leads and lead-ins. The aperture has a bottom containing openings for the lamp leads-in and a contiguous sidewall containing openings for the connecting leads. The lead-ins and connecting leads are attached in the aperture to form lugs. A cover for closing the aperture has an area matching the area of the aperture and has outer and inner surfaces. The inner surface has a central boss and depending flanges that, when fitted into the aperture after a sealant has been dispensed therein, the boss extends between the lugs and the flanges extend outside the lugs, serving to displace the sealant and force it to surround the lugs.

Abstract: The invention relates to a high-pressure discharge lamp that has an electric power consumption of less than 50 watt and comprises a discharge vessel (1?) that is sealed on two sides and is made of a translucent ceramic material as well as electrodes (2?, 3?) which are disposed inside the discharge vessel (1?) and are used for generating a gas discharge. Xenon and metal halides are arranged within the discharge vessel (1?) which is embodied as a ceramic tube that has a uniform maximum inner diameter of 1.2 mm while the minimum cold filling pressure of the xenon amounts to 0.8 megapascal.

Abstract: A protective tube which is thermally shrink-fitted over at least the end portions of a fluorescent lamp, with the protective tube encapsulating the fluorescent lamp tube and overlapping a portion of the ends of the terminal caps terminating each end of the lamp tube. The protective tube forms a seal between the protective tube, the lamp tube and the terminal caps. A fluorescent lamp having a protective tube thereon, which protective tube seals the glass tube and terminal caps of the fluorescent tube and partially overlaps the ends of the terminal caps from which the terminals project.

Abstract: A device for operating a discharge lamp of the short arc type having a feed device which supplies a direct current to the discharge lamp when operation starts and an alternating current afterwards, in which the feed device supplies a direct current which is smaller than the rated current to the discharge lamp at the start of operation, and a direct current which is at least as large as the rated current, afterwards. A control which ascertains whether the discharge lamp at the start of operation is in a hot or cold start operating state, and which establishes one of the following parameters based on whether the hot or cold operating state ascertained to exist: the value of the direct current which is at least as great as the rated current; the feed duration of the direct current which is at least as great as the rated current.

Abstract: In certain embodiments, a lamp is provided with an arc envelope including a ceramic, an end member including a material different from the ceramic, and a compliant seal disposed between the end member and the arc envelope. The compliant seal includes a plurality of layers having different thermal expansion characteristics in an order of gradual change between the arc envelope and the end member.

Abstract: A lamp comprising an elongate light source and a coaxially transparent sleeve surrounding the light source, wherein the light source is fixed at one end in the sleeve by means of a cured cement, wherein a cement barrier is present between the light source and the sleeve for preventing the cement in its uncured state from entering the middle portion of the lamp, and wherein said cemenit barrier is made of a somewhat flexible material.

Abstract: Discharge tubes for a lamp include a body portion with a first end, a second end, and a tubular member defining an interior area. The tubular member extends along an elongated axis between the first end and the second end. The discharge tube further includes a first end portion provided at the first end of the body portion. The first end portion includes a first tubular extension having a first through passage in communication with the interior area. The first end portion further includes a first transition section connected between the first tubular extension and the body portion.

Abstract: A shaped bead structure provides a bottom sealing periphery adjacent a non-bonding portion which may include an upper portion which may provide upper envelope stability and may but will preferably not bond to the glass envelope. The provision of a section of the glass envelope free of bonding above the lower peripheral sealing provides a leveraged stability to the upper portion of the glass envelope, and provides an annular space to prevent vertical spreading of a wetted glass envelope sealing zone with respect to a significant length of the glass envelope leaving it in tact and enabling it to “break” any vertically extending wetted interface and thus disrupt distortion forces. The use of two or more structures to provide a significant annular area of non-contact with the annular envelope can help to provide a structure which is not complex and easy to manufacture.

Abstract: According to the present invention, a short arc lamp comprises a lamp main body having a reflective surface therein, a first opening on an optical axis thereof, and a second openings, a window member provided so as to close the second opening and to define a discharge space between the lamp main body and the opening, a first electrode and a second electrode that are arranged so as to face each other, wherein a tip portion of each of the electrodes extends into the discharge space, and a base disposed approximately at a back end portion of the lamp main body, wherein a hole is formed in the base, the first electrode is held in a burying portion of the base, and a diameter of the first electrode in the burying portion is larger than that of the tip portion of the first electrode.

Abstract: A ceramic discharge chamber for a lamp, according to an exemplary embodiment of the invention, comprises a first member which includes a leg portion and a transition portion, wherein the leg portion and the transition portion are integrally formed as one piece from a ceramic material, and a second member which includes a body portion, wherein the body portion is bonded to the transition portion of the first member. The ceramic discharge chamber can be formed by injection molding a ceramic material to form the first member, the first member forming a first portion of the ceramic discharge chamber; and bonding the first member to a second member which forms a second portion of the ceramic discharge chamber.

Abstract: A light source device includes a discharge tube, a reflector for reflecting a light radiated from the discharge tube, and support members for supporting the discharge tube to the reflector. The support member or the discharge tube is formed of a heat insulating structure so as to prevent a temperature drop of a portion of the discharge tube near electrodes thereof. By this arrangement, it is possible to prolong the operational life of the discharge tube.

Abstract: Discharge tubes for a lamp include a body portion with a first end, a second end, and a tubular member defining an interior area. The tubular member extends along an elongated axis between the first end and the second end. The discharge tube further includes a first end portion provided at the first end of the body portion. The first end portion includes a first tubular extension having a first through passage in communication with the interior area. The first end portion further includes a first transition section connected between the first tubular extension and the body portion.

Abstract: A lamp—suitable for use within a projector or other high-light output application—includes an ultra high pressure bulb. An extension from the bulb defines a start-up bubble. A conductor is carried by the extension of the ultra high pressure bulb, generally enclosing the start-up bubble, thereby exciting gas contained within the start-up bubble. A header defines a socket within which the extension and the conductor are carried.

Abstract: The elongate bulb (1) of the lamp, which defines a longitudinal axis (A), is closed at opposite ends by sealing parts (6; 32), with in each case one cap being fitted at one end, the cap having an electrical contact element (13; 25) which is connected in an electrically conductive manner to a supply conductor (15; 21) leading to a luminous means, the contact element being accommodated in a tubular extension (11; 22) of the sealing part; the contact element (13; 25) has an attachment part (14; 24) which is directed inward toward the lamp interior and is equipped with at least two barbs (20; 26) which are in contact with the tubular extension (11; 21).

Abstract: An end closure member (1) with a feed-through (5) having a feed-through entry opening (8) and a feed-through exit opening (9) and connection means (10) for forming a gas-tight connection between the end closure member (1) and the feed-through (5), the feed-through entry opening (8) cross-section being larger than the feed-through exit opening (9), and the connection means (10) being located in the area of the feed-through exit opening (9).

Abstract: A lamp includes a reflector including a reflective portion, a heel, and a nose, wherein the nose includes an opening. A light source is disposed in the reflector. A pair of leads connects to the light source. An eyelet protrudes through the opening in the nose and receives one of the leads. A positioning member is disposed in the heel portion of the reflector. The positioning member includes an opening to receive the light source.

Abstract: Discharge tubes for a lamp include a body portion with a first end, a second end, and a tubular member defining an interior area. The tubular member extends along an elongated axis between the first end and the second end. The discharge tube includes a first end portion provided at the first end of the body portion. The first end portion includes a first tapered portion that is tapered in a direction extending substantially perpendicular from the elongated axis. The first tapered portion includes an interior surface facing the interior area. The tapered portion spans between a maximum extent in the direction of the elongated axis and a minimum extent in the direction of the elongated axis.

Abstract: A joined body is provided, including a first member having a first joining face and sapphire exposed at the first joining face and a second member having a second joining face and sapphire or polycrystalline alumina exposed at the second joining face. The first member and second member are joined by providing a raw material for the joining material between the first and second members and heat treating the raw material at a temperature of 1730° C. or lower.

Abstract: The invention relates to a high-pressure discharge lamp (1) provided with a discharge vessel (2) made of quartz glass which encloses a discharge space (3) having an ionizable filling and an electrode (4). The discharge vessel (2) is provided with a seal (5) which preferably encloses an Mo foil and forms a feedthrough for an electric conductor (6) to the electrode (4). At the location of the foil, the seal (5) has a gastight sealed cavity (10). According to the invention the cavity (10) is free of a capacitive coupling. This improves reliable ignition.

Abstract: Operation of an HID lamp may be improved by forming a glow generating recess on an exterior side the electrode. The lamp may be of standard construction with a light transmissive lamp envelope having a wall defining an enclosed volume. At least one electrode assembly is extended in a sealed fashion from the exterior of the lamp through the lamp envelope wall to be exposed at an inner end of the electrode assembly to the enclosed volume. A metal halide lamp fill is enclosed with an inert fill gas. The inner end of the electrode is formed with a recess having a least spanning dimension S and a recess depth of D where S is greater the electron ionization mean free path but less than twice the cathode fall plus negative glow distances, throughout the glow discharge phase of starting, for the chosen fill gas composition and pressure (cold).

Abstract: An arc discharge metal halide lamp having a discharge chamber with visible light permeable walls bounding a discharge region through which walls a pair of electrode assemblies are supported with interior ends thereof positioned in the discharge region spaced apart from one another. These electrode assemblies each also extend through a corresponding capillary tube affixed to the walls to have exterior ends thereof positioned outside the arc discharge chamber. At least one of these electrode assemblies comprises an electrode discharge structure with a discharge region shaft extending into the capillary tube corresponding thereto. A discharge region shaft extends outwardly in that corresponding capillary tube to be in direct contact with an interconnection shaft extending outside of that corresponding capillary tube to provide an exterior end of this electrode assembly, and which is in direct contact with a sealing cap over the end of the tube.

Abstract: A hermetically sealed lamp having at least one end-to-end seal. The end-to-end seal may be a material diffusion bond, a seal-material bond, or any other suitable bond. For example, the hermetically sealed lamp may have one or more endcaps butt-sealed to an arc envelope, such as a ceramic tube or bulb. The hermetically sealed lamp also may have one or more tubular structures, such as dosing tubes, which are butt-sealed to the endcap and/or arc envelope. Localized heating, such as the heat provided by an intense laser, also may be used to enhance any of the foregoing bonds.

Abstract: The present invention provides a joined body having a first member 7, a second member 4 and a joining material 14 interposed between the first and second members. The joining material has a porous bone structure 15 with open pores and made of a sintered product of metal powder and impregnated phase 10 impregnated into the open pores. The impregnated phase 10 includes an oxynitride glass. The joined body has improved resistance against fatigue and fracture, even when the body is subjected to thermal cycles between high and room temperatures and held at a high temperature over a long period of time.

Abstract: A protected lamp assembly includes a tubular lamp enclosed within a tubular protective housing. The lamp is supported by grommets or bushings of a resilient material that are retained within the housing. An end cap assembly may include the bushing for the lamp and also support the protective housing. Conductors through the end caps communicate with the lamp electrodes. In alternate embodiments the conductors may emerge from one of the end caps or the end caps may include a conductive coating with a connection to the lamp electrodes.

Abstract: The present invention provides a joined body having a first member, a second member and a joining material interposed between the first and second members. The joining material has a porous bone structure with open pores and made of a sintered product of metal powder and impregnated phase impregnated into the open pores. The impregnated phase has polycrystalline substance made from a metal oxide and at least one of a nitride and an oxynitride. The joined body has improved resistance against fatigue and fracture, even when the body is subjected to repeated thermal cycles between high and room temperatures.

Abstract: An assembly for lamp construction, including a solid tungsten W component (10) and at least one film (9) having two contact faces, comprising a metallic molybdenum base body and a coating, which is applied at least in part to said base body and which includes ruthenium or rhenium alone or as an alloy in the region of the first contact face, which produces the contact with the W component, whereas the second contact face is not coated and is intended to be in contact with glass.

Abstract: A discharge lamp includes a luminous bulb in which a luminous material is enclosed and a pair of electrodes are opposed in the luminous bulb; and a pair of sealing portions for sealing a pair of metal foils electrically connected to the pair of electrodes, respectively. At least one of the pair of metal foils has a twist structure.

Abstract: A lamp bracket structure for cold cathode lamps includes an anchor dock and a line coupling means. The anchor dock includes a cap, a bottom seat and a connecting section for connecting the cap to the bottom seat and allowing the cap to be moved relative to the bottom seat for opening and closing. The line coupling means is located between the cap and the bottom seat. When the cap is closed, the line coupling means clamps the power cord of a cold cathode lamp, and the line coupling means and the power supply end form electric connection. Thus the circuit of the power cord of the cold cathode lamp and the power supply end may be connected or separated rapidly.

Abstract: Described is a high intensity discharge lamp including a lamp bulb envelope, first and second electrodes, a seal and a fill situated within the lamp bulb envelope. The lamp bulb envelope is composed of single crystal sapphire tubing. The lamp bulb envelope includes end portions and a central portion, the central portion having a greater diameter than the end portions. The end portions may be a cylindrical tube shape and the central portion is a smooth three-dimensional shape. The first and second electrodes extend through opposite ends of the lamp bulb envelope so that at least a portion of each of the electrodes is situated within the lamp bulb envelope. The seal seals each of the first and second electrodes to an inside wall of the corresponding end of the lamp bulb envelope. A voltage is applied to the first and second electrodes to generate an arc plasma therebetween.

Abstract: A high pressure discharge lamp includes a luminous bulb enclosing a luminous substance therein; and a sealing portion for retaining airtightness of the luminous bulb. The sealing portion has a first glass portion extending from the luminous bulb and a second glass portion provided at least in a portion inside the first glass portion, and the sealing portion has a portion to which a compressive stress is applied.

Abstract: A discharge lamp of the short arc type with high arc stability in which the arc is prevented from fluctuating during operation is achieved by providing a short arc discharge lamp in which the hermetically sealed tubes which extend from the arc tube, and the lead pins located within the arc tube which support the electrodes, are sealed relative to one another by graded glass, and wherein cylindrical retaining bodies are attached concentrically within the hermetically sealed tubes and are penetrated by the lead pins, a metal foil that has several cambers which extend in the axial direction of the lamp being located between the cylindrical retaining bodies and the lead pins.

Abstract: A discharge lamp includes a luminous bulb in which a luminous material is enclosed and a pair of electrodes are opposed in the luminous bulb; and a pair of sealing portions for sealing a pair of metal foils electrically connected to the pair of electrodes, respectively. At least one of the pair of metal foils has a twist structure.

Abstract: An arc tube, which is capable of prolonging the life thereof by preventing occurrence of a leak caused from a crack of an arc-tube body, has the average surface roughness of each of outer surfaces 26Aa and 26Ba of tungsten electrodes 26A and 26B pinch-sealed to pinch seal portions 20b1 and 20b2 on the two sides of a light-emission tube 20a of an arc-tube body 20 is set to be 3 ?m or smaller. Thus, the state of pinch-sealing of the tungsten electrodes 26A and 26B to the pinch seal portions 20b1 and 20b2 is brought to a state in which the two elements are engaged with small pits and projections. Therefore, great compressive stress is not left in the region adjacent to the joint surface between the pinch seal portions 20b1 and 20b2 and the tungsten electrodes 26A and 26B as distinct from the conventional structure. In a case where a crack of the arc-tube body 20 is formed owing to the residual compressive stress, the crack is limited to a local portion which is the region adjacent to the joint surface.

Abstract: A ceramic metal halide discharge lamp may be made having a monolithic seal between a sapphire arc tube and a polycrystalline alumina cap. The lamp is made by providing an arc tube of fully dense sapphire and providing a cap made of unsintered compressed polycrystalline alumina doped with magnesium oxide and yttrium oxide. The cap is presintered to remove binder material at a low temperature. The presintered cap is placed on an end of the arc tube to form a close interface. The presintered cap and arc tube are then heated to until the cap is fully sintered onto the arc tube and the sapphire tube grows into the cap. A monolithic seal is formed along the interface as the sapphire grows into the polycrystalline alumina.

Abstract: Before an electrode assembly is inserted into a quartz glass tube, a reinforcement bending process is applied to a metal foil. Even when a vibration load acts on the electrode assembly during the insertion of the electrode assembly into the quartz glass tube, the metal foil is not easily deformed, so that a rod electrode can be prevented from largely swinging together with the metal foil. Consequently, the position of a tip end portion of the rod electrode can be easily recognized by using a camera, whereby the degree of the insertion of the electrode assembly into the quartz glass tube can be correctly adjusted.

Abstract: The elongate bulb (1) of the lamp, which defines a longitudinal axis (A), is closed at opposite ends by sealing parts (6; 32), with in each case one cap being fitted at one end, the cap having an electrical contact element (13; 25) which is connected in an electrically conductive manner to a supply conductor (15; 21) leading to a luminous means, the contact element being accommodated in a tubular extension (11; 22) of the sealing part; the contact element (13; 25) has an attachment part (14; 24) which is directed inward toward the lamp interior and is equipped with at least two barbs (20; 26) which are in contact with the tubular extension (11; 21).

Abstract: A cold cathode fluorescent lamp (1) has feedthrough pins (5) made from molybdenum or a molybdenum alloy that form a glass-metal seal (6) with a glass composed of 55-75 wt. % SiO2, 13-25 wt. % B2O3, 0-10 wt. % Al2O3, 5-12 wt. % alkali oxides, 0-3 wt. % alkali earth oxides, 0-5 wt. % ZrO2, 0-10 wt. % TiO2 und 0-5 wt. % remaining oxides. The lamp has hollow cathodes (4) made from a material of the group molybdenum, molybdenum alloys, niobium, niobium alloys, and the lamp is manufactured in a compact form using conventional manufacturing parameters, and the resulting lamp has crack free, long-term vacuum-tight glass-metal seals.

Abstract: An object of the present invention is to provide a joined body of a first member comprising a first joining face and sapphire exposed at the first joining face and a second member comprising a second joining face and sapphire or polycrystalline alumina exposed at the second joining face, so that the joining strength can be improved and crack formation along the joining interface can be prevented. The first member 2 and second members 4A, 4B are joined with each other by providing a raw material for the joining material between the first and second members and heat treating the raw material at a temperature of 1730° C. or lower. Alternatively, The joining materials 5A, 5B comprise an oxide or an oxynitride containing a rare earth element, aluminum and silicon, and wherein the oxide or oxynitride has a silicon content of 3 mole percent or higher and 10 mole percent or lower calculated as silicon dioxide.

Abstract: A ceramic discharge vessel having end portions and an inner space formed therein is filled with an ionizable light emitting substance and a starter gas. The end portion has an inner wall surface facing an opening formed in the end portion. A hollow portion is formed in the conductive member. The conductive member is inserted into the opening of the end portion of the vessel. A joining layer joins the inner wall surface of the end portion and the outer surface of the conductive member. A recess facing the opening is formed in the end portion, and the recess extends circumferentially with respect to the central axis “X” of the vessel. When the conductive member is inserted into the opening of the end portion of the vessel and joined, the adherence or residue of joining material onto the end face or inner surface of the conductive member may be prevented.

Abstract: In a discharge lamp which has a silica glass discharge vessel with an arc tube portion and hermetically sealed portions in which in the hermetically sealed portions of this discharge vessel metal foils are installed and hermetically sealed areas are formed, in accordance with the invention has a high endurance of the sealing action in the hermetically sealed areas and thus a long service life is obtained by a coating layer being formed on at least one side of the respective metal foil. The coating layer is formed from at least one metal oxide which is selected from titanium oxide, lanthanum oxide, tantalum oxide, zirconium dioxide which can contain yttrium oxide, and from hafnium dioxide which can contain yttrium oxide. Furthermore, the metal oxide which forms the coating layer is advantageously crystalline, and moreover, can be formed over a base layer which is made of aluminum oxide or yttrium oxide.

Abstract: The invention provides a joined body of a first member made of a metal and a second member made of a ceramic or a cermet. The joined body comprises a joining portion interposed between the first member and the second member for joining the first and second members. The joining portion comprises main phase contacting the first member and an intermediate ceramic layer existing between the second member and the main phase and contacting the second member. The main phase is composed of a porous bone structure having open pores and is made of a sintered product of metal powder, and a ceramic phase impregnated into the open pores in the porous bone structure. The joined structure has resistance to fatigue and fracture, even when the structure is subjected to repeated thermal cycles between a high temperature, for example 1000° C. or higher, and room temperature.

Abstract: Arc tube (10) has a bulbous body (12) with a hollow center portion (14) and opposite ends (16, 18). Each of these ends has a cylindrical terminal-receiving section (20, 22) extending therefrom. The hollow center portion (14) has an internal length A and an internal diameter B that provides an aspect ratio of less than 5 and an outer surface area to inner surface area ratio, measured in square units, of less than 1.5. Electrodes (24) and (26) are hermetically sealed in the terminal-receiving sections (20, 22). The lamp uses less than 7 mgs of mercury. The low pressure operation allows the use of the arc tube in lamps without a shroud and the low mercury allow the lamp to pass TCLP requirement and be conventionally landfilled.

Abstract: A ceramic body (14) for a discharge vessel (12) includes a central barrel portion (60) and two end plus (64, 66), which close opposite ends of the barrel. Main electrode (32, 34) and an initiator electrode 50 are supplied with power via conductors in leg members (70, 76, 72). In one embodiment, a first electrode 32 and the initiator electrode are supplied with current through two separate leg members. In another embodiment, a dual electrode leg member is provided with two bores (124, 126).

Abstract: A short arc type high pressure discharge lamp has a pair of electrodes disposed inside the lamp and facing each other, a light emitting portion encapsulating more than 0.15 mg/mm3 mercury, and sealing portions that extend to both sides of the light emitting portion, seal part of electrodes respectively, and join the electrodes and metallic foil, wherein a cross-sectional view of the metallic foil is an approximately omega shape.

Abstract: A ceramic discharge chamber for a lamp, according to an exemplary embodiment of the invention, comprises a first member which includes a leg portion and a transition portion, wherein the leg portion and the transition portion are integrally formed as one piece from a ceramic material, and a second member which includes a body portion, wherein the body portion is bonded to the transition portion of the first member. The ceramic discharge chamber can be formed by injection molding a ceramic material to form the first member, the first member forming a first portion of the ceramic discharge chamber; and bonding the first member to a second member which forms a second portion of the ceramic discharge chamber. The members which form the ceramic discharge chamber can greatly facilitate assembly of the discharge chamber, because the discharge chamber can be constructed with only one or two bonds between the members.