An ultraviolet emitting device according to the present disclosure includes a lamp for mounting a discharge gas and an ultraviolet emission source therein, and a plurality of yarns formed by extending and aggregating carbon nanotubes in a first direction, and includes a first electrode at least partially exposed to the discharge gas within the lamp. Accordingly, electron emission efficiency of the first electrode is improved to achieve high efficiency, and durability is also improved to provide a long-life device.

A high-pressure discharge lamp with a burner unit which has a discharge vessel which encloses a discharge space and in which two electrodes are arranged opposite one another, wherein the electrodes each have an electrode support and an electrode tip, wherein the electrode tips are located opposite one another to form an electric arc during operation of the high-pressure discharge lamp, wherein at least a first one of the electrodes is configured as a coil electrode which has an electrode support and an electrode coil formed by a wire wound around the electrode support, wherein an exposed end of the electrode support forms the electrode tip, and wherein the electrode coil is arranged in a tip region of the electrode support adjacent to the electrode tip in the discharge space, and wherein an antenna to which voltage can be applied is routed along an outer surface of the discharge vessel. The electrode coil of the first electrode has a protrusion that protrudes beyond the outer circumference of the electrode coil toward the antenna.

A discharge lamp lighting device includes a control unit adapted to control a frequency of the AC electric current supplied to a discharge lamp by a feeding unit, in different manners within a first term and a second term which are alternately repeated, the control unit is adapted to control the frequency of the AC electric current such that, within the first term, the frequency of the AC electric current becomes at least one frequency out of plural set frequencies, and is further adapted to control the frequency of the AC electric current, based on a predetermined frequency and an electric current within the previous first term, such that, within the second term, the frequency of the AC electric current becomes a frequency lower than this predetermined frequency.

A light emitting unit includes a light emitting sealed body and a voltage application circuit. The light emitting sealed body includes a container to which laser light for maintaining plasma is incident and from which light from the plasma is emitted, a first electrode which includes a first discharge portion, and a second electrode which includes a second discharge portion. An end portion of the first discharge portion has a shape in which a thickness is thinned as it goes toward the second discharge portion and an end surface of the second discharge portion extends along a plane perpendicular to an extending direction of the first discharge portion. The voltage application circuit controls a potential difference between the first electrode and the second electrode by adjusting a voltage applied to at least the first electrode.

At least one of the electrodes of a discharge lamp, including at an interior of a main body of the electrode: a heat-transmitting substance of the melting point lower than that of a material which makes up the main body; and a regulating body that is made up of a material of the melting point higher than that of the heat-transmitting substance, that includes a blade which extends in the axial direction and in a radial direction perpendicular to the axial direction, and that regulates convection of the heat-transmitting substance. Surface roughness Rz of at least one of a region which is on an inner wall face of the main body and with which the regulating body makes contact and a region which is on a surface of the regulating body and with which the inner wall face makes contact is not greater than 1.52 μm.

Apparatus, systems, and methods for processing workpieces are provided. An arc lamp can include a tube. The arc lamp can include one or more inlets configured to receive water to be circulated through the arc lamp during operation as a water wall, the water wall configured to cool the arc lamp. The arc lamp can include a plurality of electrodes configured to generate a plasma in a forming gas introduced into the arc lamp via the one or more inlets. The forming gas can be or can include a mixture of a hydrogen gas and an inert gas, the hydrogen gas in the mixture having a concentration less than 4% by volume. The hydrogen gas can be introduced into the arc lamp prior to generating the plasma. The arc lamp may be used for processing workpieces.

Apparatus, systems, and methods for processing workpieces are provided. An arc lamp can include a tube. The arc lamp can include one or more inlets configured to receive water to be circulated through the arc lamp during operation as a water wall, the water wall configured to cool the arc lamp. The arc lamp can include a plurality of electrodes configured to generate a plasma in a forming gas introduced into the arc lamp via the one or more inlets. The forming gas can be or can include a mixture of a hydrogen gas and an inert gas, the hydrogen gas in the mixture having a concentration less than 4% by volume. The hydrogen gas can be introduced into the arc lamp prior to generating the plasma. The arc lamp may be used for processing workpieces.

The short-arc discharge lamp includes a pair of electrodes arranged facing each other inside a light-emitting tube, the pair of electrodes made of a material containing tungsten; a coating formed on the first outer surface of at least one of the pair of electrodes, the coating made of a material containing ceramics; and tungsten particles adhered to a part of the second outer surface of the coating.

The invention relates to an electrode for a discharge lamp, wherein the electrode has a base body having an electrode plateau providing an end face of the electrode, wherein the base body is delimited by the electrode plateau in a longitudinal extension direction of the electrode. Furthermore, the electrode has a coating, arranged in at least a first region of the base body that is different from the electrode plateau, to increase an emission of heat. In addition, the electrode has an at least partially contiguous free region of the base body extending at least partly in the longitudinal extension direction as far as the electrode plateau, in which the coating for increasing the emission of heat is not arranged, and wherein the first region adjoins at least one section of the free region in the circumferential direction of the electrode.

Apparatus, systems, and methods for processing workpieces are provided. An arc lamp can include a tube. The arc lamp can include one or more inlets configured to receive water to be circulated through the arc lamp during operation as a water wall, the water wall configured to cool the arc lamp. The arc lamp can include a plurality of electrodes configured to generate a plasma in a forming gas introduced into the arc lamp via the one or more inlets. The forming gas can be or can include a mixture of a hydrogen gas and an inert gas, the hydrogen gas in the mixture having a concentration less than 4% by volume. The hydrogen gas can be introduced into the arc lamp prior to generating the plasma. The arc lamp may be used for processing workpieces.