Abstract: A discharge lamp includes an emitter other than thorium, which is added to a cathode in a luminous tube. Early depletion of the emitter due to excessive vaporization of the emitter from the cathode is prevented, while achieving stable lighting even at the start-up of the lighting. A main body part (31) of the cathode (3) is made from a high-melting-point metal material that contains no thorium, and a front end part (32) thereof is made from a high-melting-point metal material that contains an emitter (other than thorium). A sintered compact (34), which contains an emitter (other than thorium) at a concentration higher than the emitter contained in the front end part (32), is buried in a sealed space (33) that is formed within the main body part (31) and/or the front end part (32). The sintered compact (34) abuts against the front end part (32).

Abstract: A discharge lamp includes a cathode in a luminous tube, and an emitter, other than thorium, is added to the cathode. The emitter is prevented from being excessively vaporized from the cathode and depleted soon. Smooth lighting is enabled even at start-up. A main body part (31) of the cathode (3) is made from a metallic material having a high melting point and containing no thorium. A front end (32) is made from a metallic material having a high melting point and containing an emitter (excepting thorium). Inside a sealed space (33) formed in the main body part (31) and/or the front end part (32) is received a sintered compact (34) containing an emitter (excepting thorium) that is higher in concentration than the emitter contained in the front end part (32).

Abstract: A discharge lamp includes an emitter other than thorium, which is added to a cathode in a luminous tube. Early depletion of the emitter due to excessive vaporization of the emitter from the cathode is prevented, while achieving stable lighting even at the start-up of the lighting. A main body part (31) of the cathode (3) is made from a high-melting-point metal material that contains no thorium, and a front end part (32) thereof is made from a high-melting-point metal material that contains an emitter (other than thorium). A sintered compact (34), which contains an emitter (other than thorium) at a concentration higher than the emitter contained in the front end part (32), is buried in a sealed space (33) that is formed within the main body part (31) and/or the front end part (32). The sintered compact (34) abuts against the front end part (32).

Abstract: Provided is an excimer lamp having a simple and small structure, which can be used in, for example, a refrigerator, and can emit ultraviolet light at a wavelength effective in disinfection processing without generating ozone in a surrounding atmosphere, without leaving gas impurities and moisture in an electrical discharge vessel, and without causing a steep illuminance decrease. A fluorescent substance is disposed on an inner face of the electrical discharge vessel for converting ultraviolet light emitted upon excimer electrical discharge of a light emitting gas to ultraviolet light having a longer wavelength. An inner electrode has a coil shape. A tight winding portion is formed at a certain area of the interior electrode which extends in the center axial direction of the interior electrode such that the coil is tightly wound in the tight winding portion. A getter is attached to the tight winding portion.

Abstract: A discharge lamp includes a cathode in a luminous tube, and an emitter, other than thorium, is added to the cathode. The emitter is prevented from being excessively vaporized from the cathode and depleted soon. Smooth lighting is enabled even at start-up. A main body part (31) of the cathode (3) is made from a metallic material having a high melting point and containing no thorium. A front end (32) is made from a metallic material having a high melting point and containing an emitter (excepting thorium). Inside a sealed space (33) formed in the main body part (31) and/or the front end part (32) is received a sintered compact (34) containing an emitter (excepting thorium) that is higher in concentration than the emitter contained in the front end part (32).

Abstract: Provided is an excimer lamp having a simple and small structure, which can be used in, for example, a refrigerator, and can emit ultraviolet light at a wavelength effective in disinfection processing without generating ozone in a surrounding atmosphere, without leaving gas impurities and moisture in an electrical discharge vessel, and without causing a steep illuminance decrease. A fluorescent substance is disposed on an inner face of the electrical discharge vessel for converting ultraviolet light emitted upon excimer electrical discharge of a light emitting gas to ultraviolet light having a longer wavelength. An inner electrode has a coil shape. A tight winding portion is formed at a certain area of the interior electrode which extends in the center axial direction of the interior electrode such that the coil is tightly wound in the tight winding portion. A getter is attached to the tight winding portion.

Abstract: A first excimer lamp includes: a quartz glass-made light-emitting tube containing an excimer emission gas sealed therein; and a pair of electrodes for generating dielectric barrier discharge. One of the pair of electrodes is disposed in the inner space of the light-emitting tube so as to extend in the direction of a tube axis of the light-emitting tube, and the other one of the pair of electrodes is embedded in the tube wall of the light-emitting tube so as to extend in the direction of the tube axis of the light-emitting tube. The one electrode is electrically connected to a conductive foil hermetically embedded in an end portion of the light-emitting tube.

Abstract: A first excimer lamp includes: a quartz glass-made light-emitting tube containing an excimer emission gas sealed therein; and a pair of electrodes for generating dielectric barrier discharge. One of the pair of electrodes is disposed in the inner space of the light-emitting tube so as to extend in the direction of a tube axis of the light-emitting tube, and the other one of the pair of electrodes is embedded in the tube wall of the light-emitting tube so as to extend in the direction of the tube axis of the light-emitting tube. The one electrode is electrically connected to a conductive foil hermetically embedded in an end portion of the light-emitting tube.

Abstract: It is an object of the present invention to provide a light source apparatus capable of reducing the production cost and increasing productivity. A light source apparatus comprises an approximately spherical discharge container, sealing portions continuously formed from both ends of the discharge container respectively, and a concave reflection mirror disposed so as to surround the discharge lamp, wherein the concave reflection mirror has a spheroidal surface or paraboloid of revolution formed from a front opening edge thereof, a sealing portion receiving section is formed at a head section of the concave reflection mirror and has a flat inner bottom surface, in which an end of one of the sealing portions is received, and an end surface of an end portion of the one of the sealing portions and the inner bottom surface of the sealing portion receiving section are brought into contact.

Abstract: An external electrode type discharge lamp comprises a glass tube enclosing rare gas, a first electrode having a first end portion and a second electrode having a second end portion disposed on an surface of the glass tube in an axis direction the glass tube, wherein while the first end portion of the first electrode does not face the second electrode, the second end portion of the second electrode 2b does not face the first electrode.

Abstract: It is an object of the present invention to provide a light source apparatus capable of reducing the production cost and increasing productivity. A light source apparatus comprises an approximately spherical discharge container, sealing portions continuously formed from both ends of the discharge container respectively, and a concave reflection mirror disposed so as to surround the discharge lamp, wherein the concave reflection mirror has a spheroidal surface or paraboloid of revolution formed from a front opening edge thereof, a sealing portion receiving section is formed at a head section of the concave reflection mirror and has a flat inner bottom surface, in which an end of one of the sealing portions is received, and an end surface of an end portion of the one of the sealing portions and the inner bottom surface of the sealing portion receiving section are brought into contact.

Abstract: In a foil sealed lamp, a lamp container made of transparent material, has at least one sealing portion made of molybdenum wherein a metallic foil is buried, a light emitting section which is connected to one end of the metallic foil and a lead rod extending outward and connected to other end of the metallic foil, and wherein, in the sealing portion, a gap formed around a circumference portion of the lead rod is filled with sealing agent made of rubidium oxide or cesium oxide, and glass having boron oxide and bismuth oxide as principal components is coated on an outer end surface of the sealing portion so as to close the gap.

Abstract: To eliminate the disadvantage that the lamp current becomes large in a light source device with a discharge lamp with high radiance in a lamp with a low saturation lamp voltage, in a light source device having a discharge lamp with a pair of opposed electrodes connected to a feed device which starts the discharge lamp and which is used to supply the discharge current to the electrodes, the feed device is made to control the current feed such that the current flowing in the discharge lamp does not exceed a given current boundary value, such that, during the interval immediately after starting of the discharge lamp until sufficient heating of the discharge lamp is achieved, the current boundary value is a first boundary value, and that, after the interval expires, the current boundary value is changed to a second boundary value that is smaller than the first boundary value.

Abstract: A discharge lamp manufacturing method that provides control of the introduction of a predetermined amount of halogen, unaccompanied by carbon or hydrogen, into a discharge vessel of the lamp so that a discharge lamp having an adequate operating pressure and that can maintain enhanced lighting conditions over a long period can be achieved. In particular, a halogen-introduction carrier is used in the manufacture of the discharge lamp for introducing a predetermined amount of metal halide. The discharge lamp manufacturing method includes a device for introducing halogen into the discharge vessel and includes heating a halogen-introduction carrier composed of a porous body containing metal halides.

Abstract: In a foil sealed lamp, a lamp container made of transparent material, has at least one sealing portion made of molybdenum wherein a metallic foil is buried, a light emitting section which is connected to one end of the metallic foil and a lead rod extending outward and connected to other end of the metallic foil, and wherein, in the sealing portion, a gap formed around a circumference portion of the lead rod is filled with sealing agent made of rubidium oxide or cesium oxide, and glass having boron oxide and bismuth oxide as principal components is coated on an outer end surface of the sealing portion so as to close the gap.

Abstract: To provide a lamp seal that avoids cracking of the functionally gradient material in the manufacturing process, that assures adequate mechanical strength of the finished product, and that has improved productivity because of the ease of welding when the light-emitting tube of the lamp is sealed, the lamp seal (20) comprising a functionally gradient material (21) and a lead bar (11), in which the functionally gradient material (21) has layers of mixtures of electrically non-conductive material and conductive material such that one end is non-conductive and the other end is conductive, with layers such that the proportion of conductive material increases in stages or continually moving from one end to the other, in which the lead bar (11) passes through a hole formed in the direction of layering of the functionally gradient material and is attached in the conductive region of the functionally gradient material (21), has the proportion of conductive material at the point of attachment (26) of the lead bar (11) t

Abstract: To eliminate the disadvantage that the lamp current becomes large in a light source device with a discharge lamp with high radiance in a lamp with a low saturation lamp voltage, in a light source device having a discharge lamp with a pair of opposed electrodes connected to a feed device which starts the discharge lamp and which is used to supply the discharge current to the electrodes, the feed device is made to control the current feed such that the current flowing in the discharge lamp does not exceed a given current boundary value, such that, during the interval immediately after starting of the discharge lamp until sufficient heating of the discharge lamp is achieved, the current boundary value is a first boundary value, and that, after the interval expires, the current boundary value is changed to a second boundary value that is smaller than the first boundary value.

Abstract: A lamp seal (10, 30) of functionally gradient seal material and a lead bar (13, 32) that is fixed to the seal piece (11, 31), which seal piece is formed an inorganic layer with insulative properties and a number of mixed layers that are each mixtures of conductive inorganic materials and insulative inorganic materials, such that the proportion of conductive inorganic materials increases gradually in the direction of layering. A hole is formed extending in the direction of layering such that the lead bar can be fixed into the seal material with a sleeve-shaped metallic part made of a high-melting-point metal separating the outer periphery of the lead bar from the seal material. A lamp made with an air-tight seal formed of that lamp seal of functionally gradient material.

Abstract: An improved cermet for hermetically sealing a discharge vessel in a ceramic discharge lamp where the cermet includes a material having a coefficient of linear expansion which is at least equal to a coefficient of linear expansion of a translucent ceramic, and a material having a coefficient of linear expansion which is smaller than the coefficient of linear expansion of the translucent ceramic, where the cermet has an average coefficient of linear expansion in a range of E±1.0×10−6 (K−1) at a temperature range of 25 to 300° C., where E (K−1) is an average coefficient of linear expansion of said translucent ceramic at a temperature range of 25 to 300° C. In addition, a ceramic discharge lamp utilizing such a cermet.

Abstract: A lamp, particularly a discharge lamp, in which an bulb portion of the lamp vessel can be formed with high dimensional accuracy and an advantageous light radiation characteristic and long service life obtained is achieved by the lamp vessel having and its bulb portion and scaling tube portions which are formed from a compacted body of sintered silica glass, and by sealing components, which are hermetically connected to the sealing tube portions and to which an emission part in the bulb is joined, having a first end which is made of silicon dioxide and a second end that is made of a functional gradient material which contains an electrically conductive inorganic material component as the main constituent.