Abstract: An ultraviolet irradiator including a housing having an ultraviolet irradiation port through which the target is irradiated with the ultraviolet light, an ultraviolet lamp that emits ultraviolet light, a water-cooling jacket in which the ultraviolet lamp is mounted, a reflection plate that reflects light emitted from the ultraviolet lamp, the ultraviolet lamp, the water-cooling jacket and the reflection plate being mounted in the housing, and ultraviolet light emitted directly from the ultraviolet lamp and reflection light reflected from the reflection plate being irradiated to the outside of the housing, a heat withdrawing mechanism that withdraws heat of the reflection plate and discharges the heat to the outside of the housing; and a heat transfer member that transfers ambient heat in the housing to the heat withdrawing mechanism so that the heat withdrawing mechanism withdraws the ambient heat.

Abstract: A high pressure discharge lamp electrode of the present invention includes a core rod (10), a head (20), and a coil (30) covering the head. The head includes a smaller-diameter section (21) on the core-rod side and a larger-diameter section (22) on a tip side. The coil covers the smaller-diameter section such that a winding-start end portion (30a) of the lowermost layer is positioned at the tip side of the smaller-diameter section, and covers the smaller-diameter section and the larger-diameter section such that a winding-finish end portion (30b) of the uppermost layer is positioned on the larger-diameter section. At least a portion of the coil is welded to the larger-diameter section.

Abstract: Starting performance is improved by efficient UV-light irradiation, suppressing creeping discharge or atmospheric discharge at the outside of a glow discharge tube, and preventing cracks in a pinch seal portion even when an external force is exerted in the direction of bending a lead. In a discharge tube for emitting a UV-light, a light emitting chamber is formed on one side of a pinch seal portion for sealing an electrode assembly, and a lead protrusion port is formed on the opposite side thereof while pinching the seal portion, the lead protrusion port is formed as a sleeve having a predetermined gap relative to the lead, an external electrode disposed to the outside of the light emitting chamber includes a hold formed by bending fabrication of a metal plate.

Abstract: In an electrode having a structure in which a coil is wound around an electrode rod, an ignition performance is ensured while preventing abnormal discharge and sputtering, an appropriate electrode temperature is obtained during drive, and having this operation maintained even if the lamp is repeatedly turned on and off. A discharge lamp electrode (30) having an electrode rod (10) and a coil (20) wound around a discharge portion (11) of the electrode rod includes a first welding portion (41) in which a front end of the coil is welded to the discharge portion, a second welding portion (42) in which a rear end of the coil is welded to the discharge portion, and a weld-joining portion (50) in which at least a pair of adjacent coil portions in windings of the coil are welded to each other.

Abstract: A start assisting light source is configured such that it can be mounted simply and reliably at a position capable of efficiently radiating UV-light for enhancing the starting performance of a high pressure discharge lamp to discharge chamber without being heated to a high temperature during lighting of the lamp and also adopted to a simple constitution of not increasing the manufacturing cost. A start assisting light source includes an airtight vessel filled with a rare gas and a pipe member that penetrates through the vessel is mounted to an electrode lead which protrudes from the end face of an electrode seal portion secured to a bottom hole of the concave reflector by inserting the electrode lead through the pipe member.

Abstract: A metal halide lamp having a luminous tube formed of translucent alumina as translucent ceramic in which additives of halides are sealingly included to emit at least red, blue and green light components, wherein an energy rate of a red light component is set to 55% to 75% and an energy ratio of a blue light component is set to 15% to 25%.

Abstract: Provided is a manufacturing method to prevent devitrification of a bulb in a high pressure discharge lamp used for a projector. The method is for manufacturing a high pressure discharge lamp which uses, as a light source, a bulb made of fused quartz and including a tungsten electrode, and which is horizontally installed when the lamp is driven for actual use. The method includes the step of initially driving the bulb with an optical axis thereof being set horizontally before the high pressure discharge lamp is shipped. In the initial driving step, the rotation angle around the optical axis of the bulb is offset by 45° or more and 135° or less relative to the rotation angle around the optical axis of the bulb when the lamp is driven for actual use.

Abstract: A metal halide lamp capable of delaying the rate of deformation in an electrostrictive phenomenon caused by the discharge of a ferroelectric ceramic capacitor when dielectric breakdown is initiated between the electrodes of an arc tube thereby preventing breakage accident, wherein a starting circuit, housed in parallel connection together with an arc tube in an outer tube of a metal halide lamp has in serial connection, a ferroelectric ceramic capacitor that is charged and discharged when a voltage at a predetermined coercive voltage or higher is applied thereby outputting a starting pulse at a high voltage from a ballast, a semiconductor switch that turns to a conduction state when a voltage of a predetermined breakover voltage or higher is applied, and a time constant control resistor that delays the discharge time of electric charges discharged from the capacitor when dielectric breakdown is initiated in the arc tube.

Abstract: A necessary and sufficient amount of a UV-light is radiated to a high pressure discharge lamp for enabling reliable improvement in the starting performance by a starting light source of a simple configuration not increasing the manufacturing cost.

Abstract: Provided is an electrode for a high pressure discharge lamp, which prevents spring-back of an electrode coil, and which has high productivity and high accuracy in positioning the coil. The electrode for the high pressure discharge lamp includes: an electrode core bar (30); and a coil (35) mounted on the electrode core bar, and is configured as follows. The electrode core bar (30) includes: a small-diameter section (31) on a power supply side; and a large-diameter section (32) on a leading end side. The large-diameter section (32) has: a large-diameter portion (32a) on the small-diameter section side; a small-diameter portion (32b) having a smaller outer diameter than the large-diameter portion, the small-diameter portion forming a step (s) with the large-diameter portion therebetween; and a leading end portion (32c). The coil (35) covers a portion between the step (s) and the leading end portion.

Abstract: A light source apparatus is capable of reliably enhancing the starting performance of a high pressure discharge lamp even during hot state just after extinguishing the high pressure discharge lamp by radiating a necessary and sufficient amount of a UV-light into a discharge bulb of the lamp using an UV-enhancer of a simple constitution without increasing the manufacturing cost is provided. An UV-enhancer for radiating a UV-light to a discharge bulb for enhancing the starting performance of a high pressure discharge lamp upon starting lighting includes a discharge tube connected in parallel to a lighting circuit of the lamp, and an external electrode of the discharge tube is formed as a metal holder that holds the outer periphery of the discharge tube so as to oppose the end face of an electrode seal portion of the lamp inserted through a bottom hole in a concave reflector and secures the electrode seal portion to an electrode lead protruding from the end face thereof.

Abstract: An illuminating device that can reduce illuminance unevenness of an irradiation target face with a simple construction is provided. In a pseudo sunlight illuminating device 1 having a lamp 22 for illuminating an irradiation target face 10A, a transmission light amount adjusting unit 60 for adjusting a transmission light amount so that the illuminance distribution on the irradiation target face 10a is made uniform is provided between the lamp 22 and the irradiation target face 10A, and the transmission light amount adjusting unit 60 is provided with a light transmission plate laminate member 64 which is constructed by stacking light transmission plates 65 which are constant in transmittance in a wavelength range of light to be transmitted and whose number corresponds to an adjustment amount of the transmission light amount so that incident light is reflected at each boundary of the front and back surfaces of each light transmission plate 65.

Abstract: High color rendition (Ra?80) and high efficiency (??100 (1 m/W)) which are effects conflicting to each other in a metal halide lamp are attained. An arc tube formed of translucent ceramics, capillaries are formed continuously on the both ends of an arc chamber formed substantially in an ellipsoidal shape in the direction of the longitudinal axis by way of a transition curve with no angled corner, and the arc tube is designed to effective length L/effective inner diameter D of 1.8 to 2.2, and formed to such a size that the lowest temperature of the arc chamber is 800° C. or higher and the highest temperature of the arc chamber is 1200° C. or lower during lighting, and at least thulium iodide, thallium iodide, sodium iodide, and calcium iodide are sealed as metal halides where sodium iodide and calcium iodide are sealed by a molar ratio of 40 to 80% and less than 30%, respectively, based on the entire metal halides.

Abstract: A start assisting light source is configured such that it can be mounted simply and reliably at a position capable of efficiently radiating UV-light for enhancing the starting performance of a high pressure discharge lamp to discharge chamber without being heated to a high temperature during lighting of the lamp and also adopted to a simple constitution of not increasing the manufacturing cost. A start assisting light source includes an airtight vessel filled with a rare gas and a pipe member that penetrates through the vessel is mounted to an electrode lead which protrudes from the end face of an electrode seal portion secured to a bottom hole of the concave reflector by inserting the electrode lead through the pipe member.

Abstract: The present invention provides a ballast for a high pressure discharge lamp including a driving circuit for supplying an alternating power to a high pressure discharge lamp. In the ballast of the present invention, the high pressure discharge lamp includes: a bulb; and a startup light source disposed in a vicinity of the bulb and assisting ignition of the bulb. The startup light source has a pair of electrodes which are capacitively coupled. The driving circuit includes: a bridge unit for inverting a lamp current; a current regulator unit for regulating the lamp current; and an igniter unit for generating an ignition voltage. At the ignition, a voltage containing a frequency component higher than a driving frequency during a steady driving of the bulb is applied to the startup light source.

Abstract: A lamp with an outer bulb in which a base (30) includes a base main body (32) having a contact terminal (31) electrically connected with a receptacle and an attaching member (33) fitted to the base main body (32) in a state of retaining the lamp main body (10) and an outer bulb (20), the attaching member (33) has an insertion hole (34) formed therethrough for inserting and retaining a pinch seal (14), and a flange (36) for abutment with the opening end (21) of the outer bulb formed at the outer peripheral surface (35) thereof, and a joint portion (40) is formed for engaging the outer peripheral surface of the attaching member (33) and the inner peripheral surface (23) of the outer bulb (21).

Abstract: A charging device supplies charge current to a battery group having plural secondary batteries connected in series to perform charging. In the charging device, a discharge route circuit for discharging charge current to be supplied to the secondary battery when the battery voltage of the secondary battery exceeds a predetermined voltage while charging is provided to every secondary battery. Also provided is a cut-off circuit for cutting off the discharge route circuit from each secondary battery after charging is completed. Discharge at a discharge route circuit is suppressed and energy efficiency is increased.

Abstract: It is intended to enable accurate positioning of an electrode top end such that the arc length is constant and prevent leakage from sealing portions due to bending or twisting of a molybdenum foil upon sealing an electrode mount by heating the sealing portion. For attaining the object described above, a quartz bulb in which extension tubes each having an inner diameter larger than the inner diameter of the opening of a body tube is welded the openings of both ends of a body tube formed with light emitting portion and a sealing portion thereby forming to a positioning step is used, and electrode mounts each formed with a positioning engagement portion at a position spaced apart by a predetermined length from the electrode top end are inserted to engage the positioning engagement portion of the electrode mounts to the positioning step and, in this state, the sealing portions are sealed.

Abstract: A laminate type light emitting diode device having excellent heat radiation performance and high output capability is provided. A plurality of reflection type light emitting diode units 10 each of which includes a light emitting diode 2 and a dichroic mirror 3 in a hollow metal holder case 5 having high thermal conductivity so as to face each other are joined to one another through joint members 4 formed of electrical insulating material, thereby constructing the laminate type light emitting diode device 100.

Abstract: A laminate type light emitting diode device having excellent heat radiation performance and high output capability is provided. A plurality of reflection type light emitting diode units 10 each of which includes a light emitting diode 2 and a dichroic mirror 3 in a hollow metal holder case 5 having high thermal conductivity so as to face each other are joined to one another through joint members 4 formed of electrical insulating material, thereby constructing the laminate type light emitting diode device 100.