Abstract: The present technology provides a high-pressure sodium lamp lighting device that reduces occurrence of the acoustic resonance phenomenon. A high-pressure sodium lamp lighting device of one aspect of the present invention comprises a high-pressure sodium lamp of arc length AL within the scope of 142.8 mm?AL?167 mm. The lighting device also includes an electronic ballast configured to supply a high frequency AC voltage to the high-pressure sodium lamp. A lighting frequency of the electronic ballast is a frequency that avoids a first and a second acoustic resonance occurrence bands f1 kHz and f2 kHz determined based on equations from an arc tube inner diameter D mm of the high-pressure sodium lamp. The equation for f1 is a range of f1min to f1max=(?7.4D+130) to (?8.3D+156). The equation for f2 is a range of f2 min to f2max=(?11.5D+200) to (?10.0D+197).

Abstract: The present technology provides a high-pressure sodium lamp lighting device that reduces occurrence of the acoustic resonance phenomenon. A high-pressure sodium lamp lighting device of one aspect of the present invention comprises a high-pressure sodium lamp of arc length AL within the scope of 142.8 mm?AL?167 mm. The lighting device also includes an electronic ballast configured to supply a high frequency AC voltage to the high-pressure sodium lamp. A lighting frequency of the electronic ballast is a frequency that avoids a first and a second acoustic resonance occurrence bands f1 kHz and f2 kHz determined based on equations from an arc tube inner diameter D mm of the high-pressure sodium lamp. The equation for f1 is a range of f1min to f1max=(?7.4D+130) to (?8.3D+156). The equation for f2 is a range of f2 min to f2max=(?11.5D+200) to (?10.0D+197).

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: Disclosed is an arrangement for a cut type electrode, wherein the removal of a coil is prevented and the generation of gap between turns of a coil caused by repeatedly turning on and off of the lamp is suppressed. The electrode, which is for a discharge lamp, comprises: a core rod having a leading end portion for discharge formed by a cutting process; and a coil wound around the core rod in n-turns in a state exposing the leading end portion, wherein at least a first portion between a first turn and a turn adjacent to the first turn and a second portion between an n-th turn and a turn adjacent to the n-th turn are welded.

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 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: 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.