Abstract: A quartz arc tube for a metal halide lamps and its method of making are described. The quartz arc tube has a cylindrical design which promotes a nearly symmetric longitudinal surface temperature profile during operation. The profile has a maximum temperature of about 900° C. which allows for longer operating life at high average wall loadings.

Abstract: A high pressure discharge lamp which achieves a long life of at least 3000 hours and in which variations in lamp characteristics are suppressed is disclosed. In the high pressure discharge lamp of the present invention, during manufacturing of an electrode, a covering member 123 having a coil shape and being made of refractory metal is applied on a discharge side end of an electrode rod 122 made of refractory metal so as to cover a circumference of the electrode rod 122 in a vicinity of the discharge side end. The discharge side end 124 on which the covering member 123 is applied is fused into a semi-sphere by intermittently heat fusing the discharge side end according, for instance, to arc discharge or laser irradiation.

Abstract: A method of shatterproofing a fluorescent lamp having a glass envelope by extruding a polymeric coating over the lamp envelope so that it intimately embraces substantially all of the external contours of the lamp, including its glass envelope and end-ferrules thereby increasing the hoop strength of the glass envelope. The lamp is passed through an air lock into the main lumen of a crosshead which extrudes a cylinder of hot plastic that is radially drawn inward toward the lumen axis by an applied vacuum. A continuous chain of encapsulated lamps emerges from the crosshead that then may be cut apart to reveal individually completely encapsulated lamps.

Abstract: A sealing electrode for discharge lamp having electrically conductive cup, and an emitter pellet is disclosed. The cup seals a passage into the discharge lamp, and additionally supports the electrode pellet or tip for the discharge. The design enables the emitter, electrode and seal structure to be made separately off line, while also enabling the emitter to be protected from contaminants during subsequent assembly.

Abstract: In a discharge tube manufacture line, electrode clamps are attached to both sides of an electrode lead except on a predetermined adhesion area to fix a glass bead. Then, a power section is driven to energize the area between the electrode clamps. The surface of the predetermined adhesion area is heated and oxidized. The glass bead is welded to the oxidized surface of the predetermined adhesion area.

Abstract: The invention relates to a method for producing a structural component from at least one optoelectronic functional element and a glass pane, with the functional element being disposed in the region of a primary surface of the glass pane. This structural element is distinguished by the fact that the primary surface of the glass pane is connected to a frame such that the frame surrounds the edge surfaces of the functional element in the finished state of the composite element. The invention further relates to a functional element that can be produced with the method.

Abstract: Disclosed is a product quality test in a winding step of the entire manufacturing process of a deflection yoke, which is a core part of a display device employing a cathode ray tube such as a color TV or a monitor, and in particular, a winding zig for measuring magnetic fields of a deflection yoke and a magnetic field measuring system of a deflection yoke using the winding zig.

Abstract: A method for fabricating a PDP is disclosed. The method for fabricating a PDP including the steps of preparing first and second panels for connecting with each other, forming at least one electrode on the first panel, forming a dielectric layer of PbO on the first panel, sequentially forming Cr and Ni on the PbO layer as a mask material of the PbO layer, performing photolithography and lift-off processes on the Ni/Cr layers to form a mask pattern of Ni/Cr, and etching the PbO layer using the mask pattern of Ni/Cr to form at least one capillary tube within the PbO layer to expose the electrode.

Abstract: A method of making a wire for a gate frame of a field emission display including the step of forming a gate wire of a gate frame of a field emission display, wherein the gate wire has a cross section shaped to produce an electric field between adjacent gate wires that is substantially uniform and substantially flat across a cathode sub-pixel region of an emitter line of the field emission display. In one embodiment, the electric field causes an electron emission that is substantially straight from the cathode sub-pixel portion of the emitter line.

Abstract: A tipless arc tube for a high intensity discharge lamp and method of manufacture wherein the arc tube may remain open to an uncontrolled atmosphere during the step of hermetically sealing the arc tube. The novel arc tube and method obviate the need to perform any process steps within a controlled atmosphere. The pressure of the fill gas sealed within the arc tube may be controlled by controlling the temperature of the fill gas during the step of hermetically sealing the arc tube. The novel arc tube and method obviate the need to use a pump to control the fill gas pressure.

Abstract: A method for producing a discharge lamp of the present invention includes the steps of: preparing a glass pipe for a discharge lamp having a luminous bulb portion and a side tube portion, and a single electrode assembly including an electrode structure portion that will be formed into a pair of electrodes of the discharge lamp; inserting the single electrode assembly into the glass pipe for a discharge lamp such that the electrode structure portion of the single electrode assembly is positioned in the luminous bulb portion of the glass pipe for a discharge lamp; forming a luminous bulb in which the electrode structure portion is arranged inside by attaching the side tube portion of the glass pipe for a discharge lamp to a part of the single electrode assembly; and forming a pair of electrodes in the luminous bulb by melting and cutting a part of the electrode structure portion selectively.

Abstract: A method of producing an arc tube including inserting an electrode assembly in which a bent portion is formed in a lead wire into a glass tube to self-hold the electrode assembly to a predetermined position of the glass tube. After the electrode has been inserted to the predetermined position, pinch-sealing is conducted on a portion of the glass tube where the assembly is inserted. In the method, the electrode assembly is inserted into a metal guide pipe which is coaxially disposed with respect to the glass tube, to be once held into the pipe. Thereafter, the assembly may be pushed by a thin rod-like pushing member to be inserted to the predetermined position in the glass tube. One or more vertical grooves which are to be axially engaged with the bent portion of the assembly to circumferentially lock the bent portion may be formed in the inner side of the guide pipe. Using the one or more grooves, the assembly may be guided to the glass tube W without being in sliding contact with the guide pipe.

Abstract: A glass envelope for a light-emitting device, a device embodying the envelope, and the method of making the glass envelope by laminating two sheets of glass, one sheet having a continuous channel formed therein, and the other sheet having one or more optical elements formed therein.

Abstract: A method of manufacturing an arc tube having a light emitting tube portion, a first pinch seal portion, and a second pinch seal portion, all formed on a quartz glass tube. The first and second pinch seal portions are disposed on both sides of the light emitting tube portion. The quartz glass is provided almost vertically with the first pinch seal portion down. A thermal insulating plate is provided in a boundary position between the light emitting tube portion and a portion to be pinch-sealed in an outer peripheral space of the quartz glass tube. Liquid nitrogen is jetted from a cooling nozzle provided obliquely below the light emitting tube portion toward the same, thereby cooling the light emitting tube portion. The portion to be pinch-sealed is heated with a burner, and pinch-sealed with a pincher immediately thereafter.

Abstract: A method of removing contaminants from a double-ended arc discharge tube includes the steps of providing at least one capillary channel at each end of the tube, where the ends of the tube are sealed closed except at the capillary channels, and introducing a flushing gas into the tube through one capillary channel at one end of the tube and removing the flushing gas and contaminants through another capillary channel at another end of the tube. During manufacture, the double-ended arc discharge tube has a sealed electrode and an open capillary channel at each end of the tube.

Abstract: A high pressure discharge lamp includes a quartz glass bulb having a sealing portion; and a pair of electrodes. Each electrode of the pair of electrodes is disposed so as to be opposite the other in the quartz glass bulb. The quartz glass bulb of the high pressure discharge lamp contains at least mercury and a halogen gas. The partial pressure of oxygen (O) in the quartz glass bulb is about 2.5×10−3 Pa or less and the partial pressure of the halogen gas in the quartz glass bulb is in the range between about 1×10−8 &mgr;mol/mm3 and 1×10−7 &mgr;mol/mm3.

Abstract: A backplane with multiple arrayed electrodes positioned on the backplane is provided in a method of fabricating a liquid crystal (LC) panel. The method begins with coating an alignment layer on the backplane. By performing a rubbing process, multiple alignment trenches are formed on the alignment layer. A photoresist layer is then formed on the alignment layer. By performing a lithography process, both a side frame, having at least one slit, and multiple photoresist spacers(PR spacers) are formed on the alignment layer. A gasket seal is coated on the side frame and the multiple PR spacers. By performing a lamination process, a transparent conductive layer is laminated on the backplane. A liquid crystal filling (LC filling) processis then performed to fill a cell gap between the backplane and the transparent conductive layer with liquid crystal. Finally, an end sealing process is performed to seal the slit.

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: 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: A high intensity discharge lamp constructed with a tubular envelope composed of single crystal sapphire in which a continuous non-flash arc is created across multiple electrodes to generate a radiation emitting plasma. The lamp may operate at higher temperatures and pressures than conventional high intensity discharge lamps to produce greater luminance at any given power input. The lamp fill may be chosen from a wide range of gases and additives to produce the desired light spectra in the range from ultraviolet through near infra-red. The effective life of the lamp may be significantly extended. The lamp may be utilized particular benefits in image projection where a small powerful light source is required to optically match increasingly smaller image generation devices. In particular, the lamp may maintain a pre-selected correlated color temperature from 4,000 to 9,000° K over the life of the lamp.

Abstract: A low temperature process for silicon-based field emitter tip sharpening. A rough silicon-based field emitter tip is exposed to xenon difluoride gas in a process chamber to carry out low-temperature, isotropic etching of the rough silicon-based field emitter tip to produce a final, sharpened field emitter tip.

Abstract: A high pressure discharge lamp includes a quartz glass bulb and a pair of electrodes. Each electrode of the pair of electrodes is disposed so as to be opposite the other in the quartz glass bulb. The quartz glass bulb of the high pressure discharge lamp contains at least mercury and a halogen gas which are airtightly sealed in the quartz glass bulb. The partial pressure of oxygen (O) in the quartz glass bulb is about 2.5×10−3 Pa or less and the partial pressure of the halogen gas in the quartz glass bulb is in the range between about 1×10−6 &mgr;mol/mm3 and 1×10−8 &mgr;mol/mm3. The pair of electrodes contain potassium oxide in the range between about 20 ppm and 40 ppm.

Abstract: The invention relates to a method for producing a discharge lamp, which is preferably designed for dielectric barrier discharges. The innovation is that a frame is used in order to set, and secure in its position, an electrode running at a distance from the vessel faces in the discharge vessel of the discharge lamp. This frame is simultaneously used as an exhaust tube.

Abstract: A method for selecting a combination of a host material and a light-emitting material to be used for a light-emitting layer of an organic light-emitting device, involving the steps of: (a) disposing a mixture film containing a host material and a light-emitting material on a substrate; and (b) evaluating the mixture film with respect to light-emitting properties while irradiating a light that is absorbed by the host material to the mixture film. An organic light-emitting device with a light-emitting layer containing the combination of the host material and the light-emitting material selected by the method is also provided.

Abstract: A tipless arc tube for a high intensity discharge lamp and method of manufacture wherein the arc tube may remain open to an uncontrolled atmosphere during the step of hermetically scaling the arc tube. The novel arc tube and method obviate the need to perform any process steps within a controlled atmosphere. The pressure of the fill gas sealed within the arc tube may be controlled by controlling the temperature of the fill gas during the step of hermetically sealing the arc tube. The novel arc tube and method obviate the need to use a pump to control the fill gas pressure.

Abstract: In a novel method in the field of the production of discharge vessels, in particular for silent flat radiators, an exhaust tube 3 for evacuating and filling is inserted into an opening 2 in the discharge vessel, it being possible in a simple way by means of an adapter 4 to achieve optimum fitting and sealing between a square inner cross section of the opening 2 and a round outer cross section of the exhaust tube 3.

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 arc lamp comprises nine component parts that are brought together in three brazes and one TIG-weld to result in a finished product. An anode assembly is brazed with the rest of a body sub-assembly in one step instead of two. A single-bar cathode-support strut is brazed together as one step. A window flange and a sapphire output window are brazed together with the product of the strut braze step in a mounted-cathode-braze step. A copper-tube fill tubulation, a kovar sleeve, a ceramic reflector body, an anode flange, and a tungsten anode are all brazed together in a “body-braze” step. The products of the mounted-cathode-braze step and body-braze step are tungsten-inert-gas (TIG) welded together in a final welding step. A lamp is finished by filling it with xenon gas and pinching off the tubulation.

Abstract: The invention relates to a discharge lamp with a discharge vessel of silica glass which has a higher operating pressure than atmospheric pressure, where the high temperature viscosity (VA) in the outer surface area of the arc tube portion of the discharge vessel is lower than the high temperature viscosity (VB) at a depth of 100 microns from the outer surface of the arc tube portion. Since the high temperature viscosity (VA) in the outer surface area of the arc tube portion of the discharge vessel is lower than the high temperature viscosity (VB) at a depth of 100 microns from the outer surface of the arc tube portion, formation of thermal distortion in the vicinity of the outer surface of the arc tube portion can be suppressed. This prevents the discharge vessel from being damaged or from breaking by thermal distortion even after operation for a long time.

Abstract: The high-pressure discharge lamp of the present invention includes: a discharge chamber that is formed in a silica glass tube, a pair of electrodes that are arranged with ends confronting each other in the discharge chamber; metal foil parts that are superposed and bonded to the other ends of the electrodes, and sealing sections for hermetically sealing the discharge chamber and which are parts for embedding the other ends of the electrodes and the metal foil parts in the glass at the two ends of the silica glass tube. The electrodes and the metal foil parts are embedded in the glass in a state in which metal coils are wrapped around the vicinities of the junctions of the electrodes and metal foil parts. The ends of the metal foil parts on the electrode side are further formed as tapered portions. In addition, the tips of the tapered portions on the electrode side are positioned, with respect to their direction of width, within the width in the radial direction of the electrodes.

Abstract: A lamp apparatus comprises a lamp body, a base mounted to the lamp body, the base including a top end of base connected with a first conductor electrically and a threaded portion connected with a second conductor electrically, the top end of base and the first conductor welded through the process of mutual fusion, and a welded portion formed in a convex shape with the mixture of materials of the top end of base and the first conductor.

Abstract: A vessel according to the present invention is made of a transparent or translucent material and includes a main portion and end portions which are integrated into the main portion, respectively. At least a central area of the main portion has a thickness smaller than at the respective end portions and at the boundary areas of the respective end portions and the main portion. The inner diameter of the respective end portions is not more than about 2 mm.

Abstract: A method of making an electric lamp having a gas filled outer jacket wherein the space enveloped by the jacket may be flushed and filled with the desired fill gas without the use of a mechanical evacuation system including an exhaust pump. The space may be flushed and filled to obtain a controlled atmosphere within the space by inserting a gas dispensing probe into the space to displace the uncontrolled atmosphere with the fill gas. The final pressure of the fill gas which is sealed within the space may be controlled by controlling the temperature of the fill gas during the flush/fill procedure until the outer jacket is sealed.

Abstract: A method of manufacturing an arc tube for a discharge lamp unit, incorporating a primary pinch-sealing step for mounting an electrode assembly in an open end of a glass tube W with a chamber portion 12. The electrode assembly comprises an electrode rod 6, a connecting foil 7 and a lead wire 8 integrally connected in series. The electrode assembly is inserted into an open end of the glass tube W such that a leading end of the electrode rod projects into the chamber portion 12. A temporary pinch seal region L1 of the glass tube W is pinch-sealed such that a portion of the connecting foil that is connected to the lead wire is contacted by the glass tube W. A vacuum is maintained inside the glass tube and a main pinch seal region L2 of the glass tube is pinch-sealed such that a portion of the connecting foil connected to the electrode rod is contacted by the glass tube.

Abstract: The invention relates to a novel method for producing discharge lamps, in which discharge vessels 5 are filled in a chamber 4 with the required gas filling at normal pressure.

Abstract: A method of removing contaminants from a double-ended arc discharge tube includes the steps of providing at least one capillary channel at each end of the tube, where the ends of the tube are sealed closed except at the capillary channels, and introducing a flushing gas into the tube through one capillary channel at one end of the tube and removing the flushing gas and contaminants through another capillary channel at another end of the tube. During manufacture, the double-ended arc discharge tube has a sealed electrode and an open capillary channel at each end of the tube.

Abstract: A relatively small-diameter aperture fluorescent lamp is manufactured easily with high yield and at low cost. An aperture portion is formed in a manner that a thread-like member is inserted into a glass tube having an ultraviolet ray reflection layer and a phosphor layer formed on its inner surface, the glass tube is bent in a predetermined shape by using a bending jig, the thread-like member is pressed to the phosphor layer formed in a predetermined region in the bending member side of the glass tube while both ends thereof are pulled tight, the thread-like member is reciprocated, and phosphor of the phosphor layer in this region is exfoliated.

Abstract: The invention relates to an oven for sealing a panel to a funnel, thus forming an envelope suitable for use in a display tube, comprising a tunnel structure 9 and at least one mount for conveying an assembly of a panel and a funnel through the tunnel structure 9. The tunnel structure 9 is provided with a longitudinal slot 16A and the components of the mount for guiding the mount along and through the tunnel structure 9 are placed outside the tunnel structure. It is preferred that the components comprise a means, such as a pump or compressor 24, for flushing the interior of the assembly 22 with a fluid obtained from a source which is substantially separated from the gas(es) circulating in the oven 1, e.g. from the surroundings of the oven 1.

Abstract: A tipless arc tube for a high intensity discharge lamp and method of manufacture wherein the arc tube may remain open to an uncontrolled atmosphere during the step of hermetically scaling the arc tube. The novel arc tube and method obviate the need to perform any process steps within a controlled atmosphere. The pressure of the fill gas sealed within the arc tube may be controlled by controlling the temperature of the fill gas during the step of hermetically sealing the arc tube. The novel arc tube and method obviate the need to use a pump to control the fill gas pressure.

Abstract: A fluorescent lamp comprises a glass tubular body defining a discharge space, and first and second electrode assemblies mounted in the discharge space in opposition to each other, each of the electrode assemblies comprising a first electrode and a second electrode. Each of the first electrodes comprises a metal lead wire with an electron-emitting material disposed on a free end thereof, and each of the second electrodes comprises a cup-shaped tube coaxially surrounding one of the first electrodes and the electron-emitting material disposed on the first electrode. The second electrode tube and the electron emitting material therein form an annular gap therebetween.

Abstract: The present invention is a hybrid sealing technique. According to one or more embodiments of the present invention, an unsealed lamp body is heated and a partial pinch seal is performed on a first side of the lamp body at an outer junction area. Then, a shrink seal is applied which completes the sealing process at the first side of the lamp body by sealing an inner junction area on the same side of the lamp body. The present invention retains the benefits of the shrink seal, but alleviates the difficulty associated with holding the electrode assemblies in place when performing a traditional shrink seal. In addition, the machine which holds the electrode assemblies in place is greatly simplified.

Abstract: A multi-functional vacuum processing apparatus for luminous tubes (especially for neon tubes), glass containers, food containers, and cosmetic containers, generally includes a body frame, a vacuum pump, a main pipe, a plurality of valves, a plurality of gas tanks, a thermometer, an adjustable current controller and high voltage transformer, a turbine vacuum pump, a turbine controller, an inspector, safety sensors, and a control panel, whereby one whereby one can carry out vacuum processing procedures with fully or semi-automatic operations so that no skilful operators are required and ordinary operators can increase quality, working efficiency, service life and production rate, and decrease costs, and can provide protection, safety, troubleshooting and inspection functions.

Abstract: A high-pressure discharge lamp includes a glass housing made of a high-melting vitreous material, a pair of sealing components made of the same high-melting vitreous material and extended from the glass housing. A rare gas and a material that is solid or liquid at room temperature is sealed inside the glass housing. Electrically conductive bars are embedded in the sealing components. The air-tight seals around the electrically conductive bars are formed such that at least one metal material selected from metals and oxides of said metals is provided near the regions lying between the high-melting vitreous material and the electrically conductive bar.

Abstract: In a method for manufacturing a discharge tube including a discharge part, a sealing part formed at an end of the discharge part, and an electrode provided in the discharge part, the method includes inserting an electrode body having the electrode into a portion to be the sealing part that is adjacent to a portion to be the discharge part of a transparent insulating tube serving as a material for the discharge tube, and then sealing the portion to be the sealing part by heating and softening with a combination of a laser beam and a gas burner, thus forming the sealing part. Heat sources are selected suitably according to each region in the portion to be the sealing part, whereby a high-quality discharge tube that is highly resistant to pressure can be manufactured at high production efficiency and low cost.

Abstract: The object of the invention to devise an electrical insertion body for a tube lamp in which sealing bodies of an electrically conductive inorganic material component and a dielectric inorganic material component and upholding parts of the electrodes are attached securely to one another by sintering, and in which neither leaks nor falling out of the upholding parts of the electrodes occur.

Abstract: The present invention provides a long-life discharge lamp by removing the causes of lowering the service life of the discharge lamp owing to quartz glass constituting the discharge lamp and a gas sealed therein, and also provides a discharge lamp production method wherein the mixing of impurities affecting the service life of the discharge lamp is prevented. In the discharge lamp the content of hydrogen, oxygen and their compounds existing in the light-emitting portion is such that the maximum intensity of the light-emitting spectral intensities of the above impurities is {fraction (1/1000)} or less of the intensity of the main light-emitting spectrum of the noble gas when glow discharge occurs by supplying a current of 3 mA, and also the content of OH groups included in the quartz glass of the sealing portions is 5 ppm or less by weight.

Abstract: In a discharge lamp sealing apparatus 30, luminescent substances are charged into an arc tube 11 through an opening 13b thereof, and an electrode member 15 is then inserted into the arc tube 11 through the opening 13b. A lower end of the arc tube 11 is supported by a support jig 57 in a state that a glass ring 16c is placed around the circumference of the opening 13b. The arc tube 11 is set in an air-tight condition by a feeding conduit 51 and inserted into a heating unit 40. The heating unit 40 fuses the glass ring 16c with heat of an infrared lamp and thereby seals the opening 13b. During the sealing process, one end of the arc tube 11 is supported by the support jig 57. The support jig 57 is mainly made of a material having a greater thermal conductivity than that of the material of the arc tube 11, for example, a metal material like Al or Cu. This arrangement enables heat to be readily conducted from the arc tube 11 to the support jig 57 and accordingly prevents a temperature rise in the arc tube 11.

Abstract: The pinch-sealing for the first one of a pair of molybdenum foils is not performed by flowing inactive gas within a quartz glass tube like the prior art but performed in a manner that the lower end portion of the quartz glass tube 4 is sealed, and then and a pinch seal estimation portion 4b is squeezed by a pincher while air within the quartz glass tube is exhausted from the upper end portion thereof so that pressure within the quartz glass tube becomes in a negative pressure state of 100 torr or less and while heating the pinch seal estimation portion 4b. Accordingly, at the time of the squeezing, the inner wall surface 4c of the pinch seal estimation portion 4b thus heated is attracted to the molybdenum foil 12 side thereby to form fine concave and convex portions on the interfaces between the molybdenum foil 12 and the quartz glass tube 4, so that the molybdenum foil and the quartz glass tube are placed in an engaged state and the contact area therebetween is increased.

Abstract: A fluorescent lamp comprises a glass tubular body defining a discharge space, and first and second electrode assemblies mounted in the discharge space in opposition to each other, each of the electrode assemblies comprising a first electrode and a second electrode. Each of the first electrodes comprises a metal lead wire with an electron-emitting material disposed on a free end thereof, and each of the second electrodes comprises a cup-shaped tube coaxially surrounding one of the first electrodes and the electron-emitting material disposed on the first electrode. The second electrode tube and the electron emitting material therein form an annular gap therebetween.

Abstract: An electric discharge lamp is provided comprising; a lamp envelop including a first and a second sealing tubes both of which are sealed and a light-emitting portion located between the sealing tubes; a pier of electrodes disposed in the light-emitting portion; and a filler substance encapsulated within the lamp envelop, one of the sealing tubes having a seal-cut trace of a tip tube that has been used for introducing the filler substance into the lamp envelop therethrough.