Abstract: A manufacturing method of a high-pressure mercury lamp includes an electric field application step in which an electric field is applied to at least a light emission part (4) with the high-pressure mercury lamp being kept at a high temperature. This can reduce impurities such as hydrogen and alkali metals in a discharge space (8) and glass forming the light emission part (4). As a consequence, blackening and devitrification of the high-pressure mercury lamp while the lamp is lit can be reduced.

Abstract: A method for manufacturing a high pressure mercury lamp having a high pressure resistance strength includes an electric field application step of applying an electric field to at least a light emitting part while keeping the high pressure mercury lamp at a high temperature. As a result of the electric field application step, impurities such as hydrogen and an alkali metal existing in a discharge space and in glass used for forming the light emitting part (1) and sealing parts (2) can be reduced, with it being possible to suppress blackening and devitrification during lighting.

Abstract: A dielectric barrier discharge lamp 100 has an internal electrode 11 inside a bulb 10, and an external electrode 12 outside the bulb 10. Lamp capacity C0 per inner surface area of the bulb between the internal electrode and external electrode is set to less than 2.8 nF/m2. By setting lamp capacity C0 within this range, lamp efficiency ?, which is a value obtained by dividing an output luminous flux of the lamp by an power inputted to the lamp, is remarkably increased.

Abstract: A light source device has an internal electrode (24) disposed at an end portion inside a bulb (23), and an external electrode (25) disposed outside the bulb (23). A holder member (27) holds the external electrode (25) so as to be opposed to the bulb (23) with a predetermined spacing (26). A dielectric member (30) is disposed outside the bulb (23), at a position corresponding to the internal electrode (24) so as to be interposed between the bulb (23) and the external electrode (25).

Abstract: A dielectric barrier discharge lamp has a pair of external electrodes disposed in series along the direction of tube axis outside a bulb. A lamp capacity, which is an electrostatic capacity between the pair of external electrodes, is set such that a discharge charge quantity per unit length of the external electrodes and one discharge between the pair of external electrodes is less than 100 nC/m. The lamp capacity is regulated, for example, by a width or a length of the external electrodes or a clearance distance to the external electrodes and bulb. A high lamp efficiency can be accomplished.

Abstract: A dielectric barrier discharge lamp has a high efficiency as well as high brightness. A distance between an external electrode and a gastight container of the dielectric barrier discharge lamp decreases with a distance from an internal electrode in a longitudinal direction of the gastight container. A surface area of the external electrode per unit length thereof decreases with the distance from the internal electrode in the longitudinal direction of the gastight container. The electrostatic capacity formed between the gastight container and the external electrode is substantially constant in the longitudinal direction of the gastight container or decreases with the distance in the longitudinal direction.

Abstract: A light source device has an internal electrode (24) disposed at an end portion inside a bulb (23), and an external electrode (25) disposed outside the bulb (23). A holder member (27) holds the external electrode (25) so as to be opposed to the bulb (23) with a predetermined distance of a space (26). A dielectric member (30) is disposed outside the bulb (23), at a position corresponding to the internal electrode (24) so as to be interposed between the bulb (23) and the external electrode (25).

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 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: A manufacturing method of a high-pressure mercury lamp includes an electric field application step in which an electric field is applied to at least a light emission part (4) with the high-pressure mercury lamp being kept at a high temperature. This can reduce impurities such as hydrogen and alkali metals in a discharge space (8) and glass forming the light emission part (4). As a consequence, blackening and devitrification of the high-pressure mercury lamp while the lamp is lit can be reduced.

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: 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 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 method for manufacturing a high pressure mercury lamp having a high pressure resistance strength includes an electric field application step of applying an electric field to at least a light emitting part while keeping the high pressure mercury lamp at a high temperature. As a result of the electric field application step, impurities such as hydrogen and an alkali metal existing in a discharge space and in glass used for forming the light emitting part (1) and sealing parts (2) can be reduced, with it being possible to suppress blackening and devitrification during lighting.

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 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 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 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.