Abstract: A high pressure discharge lamp with a trigger wire wound around a side tube portion has the structure in which the side tube portion has a first glass portion extending from a luminous bulb and a second glass portion provided in at least a portion of the inside of the first glass portion, and in which the second glass portion contains at least one substance of Li, Na, and K of from 0.001 wt % to 1.0 wt % inclusive. This structure provides a high pressure discharge lamp operable with a drastically reduced starting voltage.

Abstract: A lamp with a reflector comprises a high pressure discharge lamp and a reflector. The reflector has a first opening and a second opening. Clearance between a sealing portion of the high pressure discharge lamp and the second opening is substantially filled. The sealing portion includes a first glass portion extending from a luminous bulb and a second glass portion provided in the inside of the first glass portion, and the sealing portion has a portion to which a compressive stress is applied. Moreover, when the sealing portion is disposed to extend in a substantially horizontal direction, a portion of the reflector is formed with an air inlet for introducing an air flow striking against an upper portion of the luminous bulb 1 and then coming into a lower portion of the luminous bulb 1.

Abstract: A high-pressure mercury-vapor discharge lamp according to the present invention includes: an emission tube, which is made of quartz glass and which has a substantially ellipsoidal inner space; at least mercury and a rare gas, which are sealed in the inner space of the emission tube; and at least two electrodes, which are arranged in the inner space of the emission tube so as to face each other. The lamp satisfies W≧150 watts, P≧250 atm, t≦5 mm and rl≦0.0103×W−0.00562×P−0.316×rs+0.615×t+1.93, where W [watts] is the power of the lamp during its lighting operation, P [atm] is an operating pressure in the inner space of the emission tube, rs [mm] is the shorter radius of the inner space, rl [mm] is the longer radius of the inner space (where rl≧rs), and t [mm] is the thickness of a swollen portion that defines the inner space.

Abstract: A method for manufacturing a high-pressure discharge lamp includes a process step in which a sealing portion is formed out of a side tube portion of a glass pipe that is designed for use in a discharge lamp. In the step of forming the sealing portion, a compound glass tube, which is composed of an outer tube made of a first glass and an inner tube made of a second glass whose softening point is lower than that of the first glass, is inserted into the side tube portion, which is also formed of the first glass. The side tube portion is then heated so that the side tube portion is brought in tight contact with the compound glass tube. Thereafter, at least the sealing portion is heated at a temperature higher than the strain point temperature of the second glass portion.

Abstract: The formation step of a sealing portion 2 includes the substeps of inserting, into the side tube portion 2′, a glass member 70 made of a second glass having a softening point lower than that of a first glass constituting the side tube portion 2′; tightly attaching forward and backward portions (A and C) of the glass member 70 to the side tube portion 2′ by heating the side tube portion 2′ when the glass member 70 is divided into the forward portion, the backward portion, and a central portion under the assumption that the side of the glass member 70 closer to a luminous bulb portion 1′ is the forward side, thereby forming a cavity 30 between at least a portion of the central portion (B) and the side tube portion 2′; and heating, after the attachment step, a portion including at least the glass member 70 and the side tube portion 2′ at a temperature higher than the strain point temperature of the second glass.

Abstract: A high pressure discharge lamp 100 comprises a luminous bulb 1 enclosing a luminous substance 6 inside and a sealing portion 2 for retaining the airtightness of the luminous bulb 1. The sealing portion 2 has a first glass portion 8 extending from the luminous bulb 1 and a second glass portion 7 provided at least in a portion of the inside of the first glass portion 8, and further has a portion (20) to which a compressive stress is applied. In the luminous bulb 1, mercuric bromide (HgBr2) is enclosed.

Abstract: A glass pipe 80 for a discharge lamp is prepared which includes a luminous bulb portion 1′ that will be formed into a luminous bulb of a high pressure discharge lamp and a side tube portion 2′. Subsequently, a glass member 70 made of a second glass having a softening point lower than that of a first glass constituting the side tube portion 2′ is inserted into the side tube portion 2′, after which a getter 75 is disposed in the side tube portion 2′. Then, with the pressure inside the glass pipe 80 reduced, the side tube portion 2′ is heated to tightly attach the glass member 70 to the side tube portion 2′, thereby forming a sealing portion.

Abstract: A light source unit 1000 is composed of a high-pressure discharge lamp 1100 and a reflecting mirror 1200. The reflecting mirror 1200 includes a neck portion 122 to which the high-pressure discharge lamp 1100 is attached and a reflecting portion 120, which are formed as one unit. Furthermore, air holes 126 are formed in the neck portion 122. This structure enables the high-pressure discharge lamp 1100 and the reflecting mirror 1200 to be effectively cooled and ensures the start characteristics of the high-pressure discharge lamp 1100.

Abstract: A reflecting-mirror-equipped lamp 100 including a high pressure discharge lamp 10 and a reflecting mirror 20. An opening 24 of the reflecting mirror 20 is provided with a front glass 22 and two air holes (31 and 32) are formed through the reflecting mirror 20. The air holes (31 and 32) are provided on a cross section (44) including a luminous bulb 11. If the cross section 44 is divided into regions (I through IV) consisting of first, second, third and fourth quadrants with respect to the luminous bulb 11, the air holes (31 and 32) are respectively provided in two quadrants diagonal to each other, i.e., in the first and third quadrants, respectively, or in the second and fourth quadrants, respectively.

Abstract: A high pressure mercury lamp includes a luminous bulb in which at least mercury is enclosed inside the bulb, and a pair of sealing portions that retain airtightness of the luminous bulb. The amount of the enclosed mercury is 230 mg/cm3 or more based on a volume of the luminous bulb, and heating means for heating the luminous bulb is provided at least at part of the luminous bulb and the pair of sealing portions.

Abstract: A high pressure mercury lamp includes a luminous bulb in which at least mercury is enclosed inside the bulb, and a pair of sealing portions that retain airtightness of the luminous bulb. The amount of the enclosed mercury is 230 mg/cm3 or more based on the volume of the luminous bulb, and heat-retaining means for retaining beat in the luminous bulb is provided. Thus, the present invention can suppress blackening of high pressure mercury lamps having a very high operating pressure.

Abstract: A method for producing a high pressure discharge lamp including a luminous bulb enclosing a luminous substance inside and a sealing portion for retaining airtightness of the luminous bulb, includes preparing a glass pipe for a discharge lamp including a luminous bulb portion that will be formed into a luminous bulb of a high pressure discharge lamp and a side tube portion extending from the luminous bulb portion; inserting a glass member constituted by a second glass having a softening point lower than that of a first glass constituting the side tube portion into the side tube portion, and then heating the side tube portion so as to attach the glass member and the side tube portion; and after the attachment step, heating a portion including at least the glass member and the side tube portion at a temperature higher than a strain point temperature of the second glass and lower than a strain point temperature of the first glass.

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 high pressure discharge lamp includes a luminous bulb in which a pair of electrodes are opposed to each other in the bulb. At least mercury and halogen are contained in the luminous bulb, and at least one metal selected from the group consisting of Pt, Ir, Rh, Ru and Re is present in the luminous bulb.

Abstract: A method for producing a high pressure discharge lamp unit including a high pressure discharge lamp set and fixed to a reflecting mirror includes the steps of detecting light released from a point-like light source and reflected at a reflecting surface of the reflecting mirror to determine a position for setting that is a position of the point-like light source in which the reflected light is substantially the maximum; identifying a predetermined position between electrodes of the high pressure discharge lamp; and matching the predetermined position to the position for setting.

Abstract: A high pressure discharge lamp includes a vessel made mainly of quartz including a luminous portion and side tube portions extending from both sides of the luminous portion; mercury enclosed in the luminous portion; a metal foil buried in each of the side tube portion; and an electrode rod, one end of which is connected to the metal foil and the other of which is extending to the luminous portion. The electrode rod has a surface area increase structure for increasing a surface area in at least a part of a portion buried in the side tube portion. A sealing portion glass containing at least one metal material selected from the group consisting of metals and metal oxides thereof is provided in a portion of the side tube portion including at least a part of the metal foil, a connection portion between the metal foil and the electrode rod and a part of the surface area increase structure.