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: To devise an arrangement with relatively high pressure tightness, in a short-arc super-high pressure mercury lamp which is operated with an extremely high mercury vapor pressure, a light emitting part has a pair of opposed electrodes and is filled with at least 0.15 mg/mm3 of mercury; and side tube parts extend from opposite sides of the light emitting part, and in which the electrodes are partially hermetically sealed and are each welded to a respective metal foil, in the areas in which the electrodes are welded to the metal foils, the electrodes are deformed in the direction perpendicular to the metal foils to a degree of deformation that is at most 10%.

Abstract: To form side tubes with adequate resistance to pressure, and to provide a short-arc, ultra-high-pressure discharge lamp having such side tubes, and to provide a method of manufacturing such a lamp, a short-arc, ultra-high-pressure discharge lamp (1) has a luminescent tube (10) within which a pair of electrodes (2,2) face each other, and side tubes (11) that extend from opposite sides of the luminescent tube and in which a portion of the electrodes is sealed and in which a small space (B) is formed to enable the electrodes (2) to expand and contract freely without compression along their axes due to a difference in the indices of expansion of the materials that make up the electrodes (2) and the side tubes (11).

Abstract: To reduce and prevent electrode displacement and at the same time to devise an arrangement of the side tube parts with high adhesion, a short-arc, ultra-high pressure discharge lamp a light emmitting part in which there is a pair of opposed electrodes and which is filled with at least 0.15 mg/mm3 of mercury is provided with side tube parts which extend from opposite sides of the light emitting part in which the electrodes are partially hermeticallly sealed and in which the electrodes are each welded in a central valley of a metal foil that has a cross section with an essentially inverted W-shape. The valley and flanking arches or peaks of the W-shape may be sarpentine or sinusoidal, trapezoidal, or rectangular in addition to the traditional W-shape having acutely angled corners between straight legs.

Abstract: An arrangement with a relatively high pressure tightness in a super-high pressure mercury lamp which is operated with an extremely high mercury vapor pressure is achieved in accordance with the invention in a super-high pressure discharge lamp of the short arc type having a light emitting part in which a pair of electrodes are disposed opposite each other and which is filled with at least 0.15 mg/mm3 mercury; and side tube parts which extend from each side of the light emitting part and in each of which a respective one of the electrodes is partially hermetically sealed and is connected to a metal foil, by the area of the respective metal foil which is connected to the respective electrode has a smaller width than the width in the remaining area of the metal foil, the area with the smaller width wrapping at least partially around the outside surface of the electrode.

Abstract: An arrangement with relatively high pressure tightness in a super-high pressure mercury lamp of the short arc type which is operated with an extremely high mercury vapor pressure is achieved by the super-high pressure mercury lamp having the following characteristic: an arc tube portion in which there is a pair of opposed electrodes, and which is filled with greater than or equal to 0.15 mg/mm3 of mercury; and side tube portions which extend from opposite sides of the arc tube portion, in which the electrodes are partially hermetically enclosed, and in which the electrodes and metal foils are welded to one another, and the width of the metal foils in the weld areas is so small that it is less than or equal to the diameter of these electrodes.

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: An arrangement with relatively high pressure tightness in a super-high pressure mercury lamp which is operated with an extremely high mercury vapor pressure is achieved the following: an emission part contains a pair of opposed electrodes, each of which has a side section and an end face, and which is filled with at least 0.15 mg/mm3 mercury; side tube parts made of quartz glass extend from opposite sides of the emission part and the side section and end face of a respective electrode is partially hermetically enclosed is each side part; the electrodes are arranged in side tube parts with a small intermediate space formed between the side sections and the end faces of the electrodes and the quartz glass of which the side tube parts is made; and the side parts of the electrodes have at least partially concave-convex areas in the side tube parts.

Abstract: To form side tubes with adequate resistance to pressure, and to provide a short-arc, ultra-high-pressure discharge lamp having such side tubes, and to provide a method of manufacturing such a lamp, a short-arc, ultra-high-pressure discharge lamp (1) has a luminescent tube (10) within which a pair of electrodes (2,2) face each other, and side tubes (11) that extend from opposite sides of the luminescent tube and in which a portion of the electrodes is sealed and in which a small space (B) is formed to enable the electrodes (2) to expand and contract freely without compression along their axes due to a difference in the indices of expansion of the materials that make up the electrodes (2) and the side tubes (11).

Abstract: A super-high pressure discharge lamp of the short arc type which has an arc tube portion in which there is a pair of opposed electrodes and which is filled with at least 0.15 mg/mm3 mercury, and side tube portions which extend from opposite sides of the arc tube portion and in which there are metal foils. The electrodes are each electrically connected to a respective one of the metal foils by a metallic component with cross-sectional area that is smaller than the cross sectional area of the electrodes in the area in which the electrodes are located in the side tube portions.

Abstract: An arrangement with a relatively high pressure tightness in a super-high pressure mercury lamp which is operated with an extremely high mercury vapor pressure is achieved in accordance with the invention in a super-high pressure discharge lamp of the short arc type having a light emitting part in which a pair of electrodes are disposed opposite each other and which is filled with at least 0.15 mg/mm3 mercury; and side tube parts which extend from each side of the light emitting part and in each of which a respective one of the electrodes is partially hermetically sealed and is connected to a metal foil, by the area of the respective metal foil which is connected to the respective electrode has a smaller width than the width in the remaining area of the metal foil, the area with the smaller width wrapping at least partially around the outside surface of the electrode.

Abstract: The present invention provides a short arc type mercury discharge lamp that, at lamp startup time, quickly shifts glow discharge to arc discharge, and quickly shifts the arc discharge position from the coil to the electrode tip, making it possible to maintain a stable discharge state, in the short arc type mercury discharge lamp 1, a coil 5 has been arranged on the side surface of an electrode 4, and 0.15 mg/mm3 or more of mercury has been sealed inside a discharge vessel, wherein the side part 51 of the coil 5 close to the tip side of the electrode is constructed so as to be fixed to the side surface of the electrode 4, and, at least, the part 52 of the coil 5 following the side part 52 is distanced from the side surface of the electrode.

Abstract: To reduce and prevent electrode displacement and at the same time to devise an arrangement of the side tube parts with high adhesion, a short-arc, ultra-high pressure discharge lamp a light emitting part in which there is a pair of opposed electrodes and which is filled with at least 0.15 mg/mm3 of mercury is provided with side tube parts which extend from opposite sides of the light emitting part in which the electrodes are partially hermetically sealed and in which the electrodes are each welded in a central valley of a metal foil that has a cross section with an essentially inverted W-shape. The valley and flanking arches or peaks of the W-shape may be serpentine or sinusoidal, trapezoidal, or rectangular in addition to the traditional W-shape having acutely angled corners between straight legs.

Abstract: To devise an arrangement with relatively high pressure tightness, in a short-arc super-high pressure mercury lamp which is operated with an extremely high mercury vapor pressure, a light emitting part has a pair of opposed electrodes and is filled with at least 0.15 mg/mm3 of mercury; and side tube parts extend from opposite sides of the light emitting part, and in which the electrodes are partially hermetically sealed and are each welded to a respective metal foil, in the areas in which the electrodes are welded to the metal foils, the electrodes are deformed in the direction perpendicular to the metal foils to a degree of deformation that is at most 10%.

Abstract: An arrangement with relatively high pressure tightness in a super-high pressure mercury lamp of the short arc type which is operated with an extremely high mercury vapor pressure is achieved by the super-high pressure mercury lamp having the following characteristic:

Abstract: A super-high pressure discharge lamp of the short arc type which has an arc tube portion in which there is a pair of opposed electrodes and which is filled with at least 0.15 mg/mm3 mercury, and side tube portions which extend from opposite sides of the arc tube portion and in which there are metal foils. The electrodes are each electrically connected to a respective one of the metal foils by a metallic component with cross-sectional area that is smaller than the cross sectional area of the electrodes in the area in which the electrodes are located in the side tube portions.

Abstract: An arrangement with relatively high pressure tightness in a super-high pressure mercury lamp which is operated with an extremely high mercury vapor pressure is achieved the following:

Abstract: To form side tubes with adequate resistance to pressure, and to provide a short-arc, ultra-high-pressure discharge lamp having such side tubes, and to provide a method of manufacturing such a lamp, a short-arc, ultra-high-pressure discharge lamp (1) has a luminescent tube (10) within which a pair of electrodes (2,2) face each other, and side tubes (11) that extend from opposite sides of the luminescent tube and in which a portion of the electrodes is sealed and in which a small space (B) is formed to enable the electrodes (2) to expand and contract freely without compression along their axes due to a difference in the indices of expansion of the materials that make up the electrodes (2) and the side tubes (11).

Abstract: A tipless discharge lamp of the short arc type in which on the outside surface of the arc tube there is no residual filling tube tip, and in which an exact distance between the electrodes is obtained is achieved in a metal halide lamp of the short arc type by a pair of electrodes being located in an arc tube, by the electrodes are parts of a one-piece electrode component that has been fracture-split so that, at least to some extent, fracture traces are present on the faces of these electrodes which have not undergone mechanical processing such as cutting, polishing, or the like, and elimination of the use of a filling tube, so that no residual filling tube tip projections remain on the outside surface of the arc tube. Furthermore, precise positioning of the pair of electrodes in the arc tube results from the hermetically sealed portion being drawn outwardly in the base area of at least one of the electrodes creating an area with a smaller diameter than the remainder of that hermetically sealed portion.