Abstract: A short-arc discharge lamp includes a pair of electrodes disposed facing each other inside a light-emitting tube, a scale-like structure being formed on an outer surface of at least one electrode of the pair of electrodes, and a coating film covering the outer surface on which the scale-like structure is formed. The scale-like structure includes a plurality of flaky protrusions protruding from the outer surface in a direction inclined with respect to a normal direction of the outer surface, each flaky protrusion having a front surface whose angle formed with the outer surface is an obtuse angle and a back surface whose angle formed with the outer surface is an acute angle. The coating film contains at least one of metal oxides, metal carbides, metal borides, metal silicides, and metal nitrides. A part of the coating film enters a space sandwiched between the back surface and the outer surface.

Abstract: A short-arc discharge lamp includes a pair of electrodes disposed facing each other inside a light-emitting tube, a scale-like structure being formed on an outer surface of at least one electrode of the pair of electrodes, and a coating film covering the outer surface on which the scale-like structure is formed. The scale-like structure includes a plurality of flaky protrusions protruding from the outer surface in a direction inclined with respect to a normal direction of the outer surface, each flaky protrusion having a front surface whose angle formed with the outer surface is an obtuse angle and a back surface whose angle formed with the outer surface is an acute angle. The coating film contains at least one of metal oxides, metal carbides, metal borides, metal silicides, and metal nitrides. A part of the coating film enters a space sandwiched between the back surface and the outer surface.

Abstract: A high-pressure discharge lamp includes a cathode body composed of a cathode made of tungsten or tungsten alloy and a lead rod inserted in a lead rod insertion hole of the cathode. The cathode has a carbonized layer made of tungsten carbide (W2C) formed on a surface thereof exposed to a discharge space (except for a tip portion thereof) and on an inner surface of the lead rod insertion hole. The carbonized layer contains carbon in an amount of 0.44 g/cc to 0.53 g/cc.

Abstract: A high-pressure discharge lamp includes a cathode body composed of a cathode made of tungsten or tungsten alloy and a lead rod inserted in a lead rod insertion hole of the cathode. The cathode has a carbonized layer made of tungsten carbide (W2C) formed on a surface thereof exposed to a discharge space (except for a tip portion thereof) and on an inner surface of the lead rod insertion hole. The carbonized layer contains carbon in an amount of 0.44 g/cc to 0.53 g/cc.

Abstract: A discharge lamp includes a discharge vessel. A xenon gas is sealed within the discharge vessel so as to serve as a light emitting gas, the discharge vessel is made from quartz glass, a pair of electrodes are arranged so as to face each other in the discharge vessel, and the discharge vessel has a chip portion. The chip portion is made from a glass member that has a composition different from that of the discharge vessel, and the glass member has a transmittance of 50% or more over a wavelength range from 170 nm to 300 nm.

Abstract: A discharge lamp includes a discharge vessel. A xenon gas is sealed within the discharge vessel so as to serve as a light emitting gas, the discharge vessel is made from quartz glass, a pair of electrodes are arranged so as to face each other in the discharge vessel, and the discharge vessel has a chip portion. The chip portion is made from a glass member that has a composition different from that of the discharge vessel, and the glass member has a transmittance of 50% or more over a wavelength range from 170 nm to 300 nm.

Abstract: To provide a long-lived short-arc type discharge lamp and light-source device in which high temperature oxidation of external lead rods is inhibited, a short-arc type discharge lamp of the type in which external lead rods (24) are electrically connected to electrodes (21, 22) that extend from sealing tubes (12) that are located at each of opposite ends of an emission envelope (11), and in external lead rods are electrically connected via lead lines (25) to bases (30) that are attached to a respective sealing tube, by a first ventilation aperture (31) being formed in a peripheral wall of each base and second ventilation aperture (32) being formed in the tail end of at least one base. Ventilation-concentration hoods (28) that conduct cooling air can be mounted at the first aperture. The lamp is held by fixing the periphery of each base in a lamp support plate (51).

Abstract: To reliably prevent the appearance of cracks in the sealing tube, a short-arc discharge lamp having a bulb with a light-emitting tube and sealing tubes connected to both sides of the light-emitting tube, with an anode and a cathode positioned facing each other within the light-emitting tube on the ends of electrode rods that pass through sleeve material that is supported by the sealing tubes, in which short-arc discharge lamp molybdenum foil is located between the sleeve material and the sealing tube, the outer surface of the molybdenum foil which faces the sealing tube has a surface treatment with a high-melting-point, oxidation resistant metal. The high-melting-point metal is preferably chosen from among tungsten, rhenium, tantalum, rhodium and platinum.

Abstract: To provide a long-lived short-arc type discharge lamp and light-source device in which high temperature oxidation of external lead rods is inhibited, a short-arc type discharge lamp of the type in which external lead rods (24) are electrically connected to electrodes (21, 22) that extend from sealing tubes (12) that are located at each of opposite ends of an emission envelope (11), and in external lead rods are electrically connected via lead lines (25) to bases (30) that are attached to a respective sealing tube, by a first ventilation aperture (31) being formed in a peripheral wall of each base and second ventilation aperture (32) being formed in the tail end of at least one base. Ventilation-concentration hoods (28) that conduct cooling air can be mounted at the first aperture. The lamp is held by fixing the periphery of each base in a lamp support plate (51).