Abstract: Disclosed is a high-pressure discharge lamp (100) that reduces the occurrence of cracks even under high mercury vapor pressure. The high-pressure discharge lamp (100) is provided with a glass arc tube (102) including a light-emitting part (103) and a sealing part (104) connected to the light-emitting part (103), the light-emitting part (103) enclosing a discharge space, and a pair of electrodes (101), one end of each of the electrodes (101) facing one end of the other electrode (101) in the discharge space, and another end of each electrode (101) being embedded in the sealing part (104) and connected to a metal foil (105), at least one embedded section of the pair of electrodes (101) including at least one projection (101c).

Abstract: A high-pressure discharge lamp having an arc tube with a casing made of glass. The arc tube includes a light-emitting part and sealing parts connected to the light-emitting part. A pair of electrode rods are disposed within the glass casing such that their tips face each other with a gap therebetween and project into the discharge space, and their base ends are embedded in the sealing parts and overlap surfaces of metal foils provided in the sealing parts. Each base end is coated with a coating foil made of metal and having a C-like cross section with a slit formed between edges thereof. An end of the coating foil farthest from the light-emitting part is located closer to the light-emitting part than an end of the metal foil closest to the light-emitting part.

Abstract: The present invention aims to prevent breakage of a sealing part and an electrode of a high pressure discharge lamp, and provides an electrode 100 used for a discharge lamp and having a rod-shaped part 101, one end of the rod-shaped part 101 to be sealed by a sealing part of an arc tube of the discharge lamp, the other end of the rod-shaped part 101 to be in a discharge space in the arc tube, wherein the rod-shaped part 101 has a rough surface that is composed of a plurality of types of crystal grains each having a different surface condition due to differences in crystal orientation.

Abstract: A high-pressure discharge lamp having an electrode including an electrode rod, a melted part and a coil part, and satisfying 0 < La L < 0.3 , where La denotes an average value of a length in units of mm of an exposed portion of the coil part in an axial direction of the electrode rod, the exposed portion being not covered with the melted part, and L denotes a maximum value of a length in units of mm between a tip of a head of the electrode rod and an opposite edge of the coil part to the melted part, measured in the axial direction.

Abstract: A high-pressure discharge lamp having an electrode including an electrode rod, a melted part and a coil part, and satisfying 0 < La L < 0.3 , where La denotes an average value of a length in units of mm of an exposed portion of the coil part in an axial direction of the electrode rod, the exposed portion being not covered with the melted part, and L denotes a maximum value of a length in units of mm between a tip of a head of the electrode rod and an opposite edge of the coil part to the melted part, measured in the axial direction.

Abstract: A high-pressure discharge lamp having an arc tube with a casing made of glass. The arc tube includes a light-emitting part and sealing parts connected to the light-emitting part. A pair of electrode rods are disposed within the glass casing such that their tips face each other with a gap therebetween and project into the discharge space, and their base ends are embedded in the sealing parts and overlap surfaces of metal foils provided in the sealing parts. Each base end is coated with a coating foil made of metal and having a C-like cross section with a slit formed between edges thereof. An end of the coating foil farthest from the light-emitting part is located closer to the light-emitting part than an end of the metal foil closest to the light-emitting part.

Abstract: To aim to provide a simple high-pressure discharge lamp apparatus. The lamp apparatus suppresses local temperature increase in an arc tube during lighting, and uniforms temperature in the arc tube. A lamp is built into a reflector so as to form a lamp unit such that a central axis of the lamp coincides with an optical axis of the reflector. A pair of rotating bodies with a fixed interval therebetween each has a circular outer circumferential surface, and the optical axis of the reflector coincides with a central axis of the circumferential surface of the rotating bodies. A pair of electrodes is electrically connected to the circumferential surface of each rotating body, and the rotating bodies are placed on two rotating rollers arranged in parallel. A drive motor drives the lamp unit in a fixed direction on the rotating rollers. Feeding members feed the rotating bodies with power.

Abstract: A short arc high-pressure discharge lamp has an arc tube 1 made of quartz glass including a light-emitting portion 2 that fills mercury inside thereof and has a pair of electrodes arranged so as to face each other, and a sealing portion 3 connected to the light-emitting portion. The pair of electrodes have an electrode bar 5a, one end of the electrode bar is located in an internal space of the light-emitting portion, and the other end of the electrode bar is embedded in the sealing portion and bonded to a conductive metal-foil 7 sealed in the sealing portion. In at least a part of a portion of the electrode bar embedded in the sealing portion, the entire outer peripheral surface thereof is covered tightly with a metal-foil sleeve 7a.

Abstract: The present invention is directed to a method for manufacturing a high-pressure discharge lamp including: a spherical portion forming a light-emitting portion (1a); sealing portions that are connected with both ends of the spherical portion; an electrode (2a) that is sealed to each of the sealing portions; and a metal foil (3a) that is connected with a rear end of each electrode. A vessel provided with a cylindrical glass tube (8) on both ends of the spherical portion is used, a connection structure of the metal foil and the electrode are disposed in the glass tube such that a front end of the electrode is positioned in the spherical portion, and the glass tube is melted by heat and shrunk for sealing the metal foil and the electrode so as to form the sealing portion. An inner diameter ? of the glass tube before the heat-melt processing and a distance L from an edge of the metal foil to the internal space of the spherical portion are set to satisfy a relationship of L/??1.

Abstract: Disclosed is a high-pressure discharge lamp (100) that reduces the occurrence of cracks even under high mercury vapor pressure. The high-pressure discharge lamp (100) is provided with a glass arc tube (102) including a light-emitting part (103) and a sealing part (104) connected to the light-emitting part (103), the light-emitting part (103) enclosing a discharge space, and a pair of electrodes (101), one end of each of the electrodes (101) facing one end of the other electrode (101) in the discharge space, and another end of each electrode (101) being embedded in the sealing part (104) and connected to a metal foil (105), at least one embedded section of the pair of electrodes (101) including at least one projection (101c).

Abstract: The present invention aims to prevent breakage of a sealing part and an electrode of a high pressure discharge lamp, and provides an electrode 100 used for a discharge lamp and having a rod-shaped part 101, one end of the rod-shaped part 101 to be sealed by a sealing part of an arc tube of the discharge lamp, the other end of the rod-shaped part 101 to be in a discharge space in the arc tube, wherein the rod-shaped part 101 has a rough surface that is composed of a plurality of types of crystal grains each having a different surface condition due to differences in crystal orientation.

Abstract: A long-life high-pressure discharge lamp can (i) suppress damage to sealing portions, especially at an initial stage of the accumulated lighting time, (ii) allow for easy assembly of components such as electrodes and (iii) prevent deformation/ripping of metallic foils. An arc tube is a glass enveloping vessel with electrodes arranged therein, and includes: a light emitting portion in which materials are enclosed and a discharge space is formed; and sealing portions provided at ends of the light emitting portion. Each electrode includes an electrode bar whose first end is in the discharge space, and whose second end is in the corresponding sealing portion and connected to a metallic foil. The second end of each electrode bar is partially wrapped around by a sleeve-like metallic cover foil that has a cut-out section positioned over a joining area where the second end of each electrode bar is joined to the metallic foil.

Abstract: To aim to provide a simple high-pressure discharge lamp apparatus. The lamp apparatus suppresses local temperature increase in an arc tube during lighting, and uniforms temperature in the arc tube. A lamp is built into a reflector so as to form a lamp unit such that a central axis of the lamp coincides with an optical axis of the reflector. A pair of rotating bodies with a fixed interval therebetween each has a circular outer circumferential surface, and the optical axis of the reflector coincides with a central axis of the circumferential surface of the rotating bodies. A pair of electrodes is electrically connected to the circumferential surface of each rotating body, and the rotating bodies are placed on two rotating rollers arranged in parallel. A drive motor drives the lamp unit in a fixed direction on the rotating rollers. Feeding members feed the rotating bodies with power.

Abstract: The present invention is directed to a method for manufacturing a high-pressure discharge lamp including: a spherical portion forming a light-emitting portion (1a); sealing portions that are connected with both ends of the spherical portion; an electrode (2a) that is sealed to each of the sealing portions; and a metal foil (3a) that is connected with a rear end of each electrode. A vessel provided with a cylindrical glass tube (8) on both ends of the spherical portion is used, a connection structure of the metal foil and the electrode are disposed in the glass tube such that a front end of the electrode is positioned in the spherical portion, and the glass tube is melted by heat and shrunk for sealing the metal foil and the electrode so as to form the sealing portion. An inner diameter ? of the glass tube before the heat-melt processing and a distance L from an edge of the metal foil to the internal space of the spherical portion are set to satisfy a relationship of L/??1.

Abstract: A short arc high-pressure discharge lamp has an arc tube 1 made of quartz glass including a light-emitting portion 2 that fills mercury inside thereof and has a pair of electrodes arranged so as to face each other, and a sealing portion 3 connected to the light-emitting portion. The pair of electrodes have an electrode bar 5a, one end of the electrode bar is located in an internal space of the light-emitting portion, and the other end of the electrode bar is embedded in the sealing portion and bonded to a conductive metal-foil 7 sealed in the sealing portion. In at least a part of a portion of the electrode bar embedded in the sealing portion, the entire outer peripheral surface thereof is covered tightly with a metal-foil sleeve 7a.

Abstract: An image display device accurately evaluates the possibility of problems occurring due to the state of impure gas inside a discharge envelope in a high pressure discharge lamp. The image display device includes the high voltage discharge lamp and an evaluation unit (51) for evaluating the possibility of problems occurring due to the state of impure gas. The evaluation unit (51) includes a high voltage pulse generator (57) that generates a high voltage pulse for breaking insulation in the high pressure lamp, a constant current generator (58) that generates a constant current for illuminating the high pressure discharge lamp in a glow discharge state, a lamp voltage measurer (59) that measures lamp voltage during illumination in the glow discharge state, an LED (63), and a controller (65).

Abstract: A long-life high-pressure discharge lamp can (i) suppress damage to sealing portions, especially at an initial stage of the accumulated lighting time, (ii) allow for easy assembly of components such as electrodes and (iii) prevent deformation/ripping of metallic foils. An arc tube is a glass enveloping vessel with electrodes arranged therein, and includes: a light emitting portion in which materials are enclosed and a discharge space is formed; and sealing portions provided at ends of the light emitting portion. Each electrode includes an electrode bar whose first end is in the discharge space, and whose second end is in the corresponding sealing portion and connected to a metallic foil. The second end of each electrode bar is partially wrapped around by a sleeve-like metallic cover foil that has a cut-out section positioned over a joining area where the second end of each electrode bar is joined to the metallic foil.

Abstract: A high-pressure mercury lamp is provided that includes a transparent envelope made of quartz glass, in which mercury, halogen, and a rare gas are sealed and a pair of electrodes provided in the transparent envelope. The amount of the halogen sealed in the transparent envelope is in the range from 1.0×10?6 ?mol/mm3 to 1.0×10?2 ?mol/mm3, and 2.5 mol % to 25 mol % of oxygen with respect to the amount of the halogen is present in the transparent envelope. The high-pressure mercury lamp can prevent blackening of an inner wall of the transparent envelope from occurring over a long period of lighting without deteriorating the startability or lamp characteristics, thus achieving a long life.

Abstract: The present invention provides a high-pressure discharge lamp 100 including a luminous bulb 10 enclosing at least a rare gas and halogen in the bulb and made substantially of quartz glass; and an electrode 12 made substantially of tungsten and disposed in the luminous bulb. The mole number of the halogen is larger than the sum of the total mole number of metal elements (except the tungsten element and the mercury element) that have the property of bonding to the halogen and are present in the luminous bulb 10 and the mole number of the tungsten present in the luminous bulb by evaporation from the electrode 12 during lamp operation.

Abstract: The present invention provides a high pressure discharge lamp which is provided with a discharge tube containing a pair of electrodes therein and being filled with mercury, an inert gas and a halogen gas, the amount of the mercury filled being 0.12 to 0.35 mg/mm3, the halogen gas being at least one gas selected from the group consisting of Cl, Br and I and being present in an amount of 10?7 to 10?2 ?mol/mm3, and the electrodes being mainly composed of tungsten, and the tungsten as a material of the electrodes contains not more than 12 ppm of potassium oxide (K2O). In such a high pressure discharge lamp, blackening of the discharge tube due to the potassium oxide (K2O) contained in the tungsten, and decrease in illumination maintenance can be prevented, thus providing a high pressure discharge lamp with a long lifetime, a lighting optical apparatus using the high pressure discharge lamp as a light source, and an image display system using the lighting optical apparatus.