Ushio Denki Kabushiki Kaisha

Takuya Tsukamoto

Yoshihiro Horikawa

Takashi Yamashita

Minoru Fukuda

Tomoyoshi Arimoto

Toyohiko Kumada

Hirohisa Iwabayashi

Takumi Yamane

Nobuhiko Sugihara

Masashi Dan

Shuki Kasaishi

Noriko Nishiaki

Senga Takehito

Kimiya Iwasaki

Yasushi Mizushima

Provided are a light-emitting gas recovery method and a recovery apparatus that allow light-emitting gas to be recover efficiently. A light-emitting gas recovery method includes: a step (a) of preparing a lamp to be discarded including a tube body filled with the light-emitting gas; a step (b) of placing the lamp in an internal space of a chamber; a step (c) of reducing an air pressure in the internal space of the chamber; a step (d) of applying energy to a part of the tube body to allow an internal space of the tube body and the internal space of the chamber to communicate with each other without entirely breaking the tube body, and releasing the light-emitting gas from the tube body; and a step (e) of discharging a first gas present in the internal space of the chamber toward a recovery mechanism after the step (d).

Light-emitting gas recovery method and light-emitting gas recovery apparatus

A high pressure discharge lamp comprises a pair of electrodes that face each other in an electric discharge container, wherein an electrode axis of each electrode is buried in a sealing portion, each electrode axis is joined to a metallic foil, two or more grooves are formed in an axis direction on a portion of the electrode axis, which corresponds to the sealing portion, an upper shoulder portion of each groove is formed in a shape of a curved surface, a diameter of the electrode axis is 0.3 mm to 1 mm, and a curvature radius of the curved surface upper shoulder portion is 5 &#x3bc;m-50 &#x3bc;m.

High pressure discharge lamp

A high pressure discharge lamp light source device is provided having a quartz glass discharge vessel enclosing two opposed electrodes that are spaced apart by at most 2.0 mm, each electrode having a projection formed at a tip end thereof, at least 0.20 mg/mmof mercury and a halogen; and a power supply device for supplying alternating current to the lamp, The power supply device is adapted to switch between a nominal electric power lighting mode and a low electric power lighting mode having a defined current value in a range of 40 to 70% of a nominal electric power consumption. In the low power mode, the power supply alternately supplies a base current in a range between 100 Hz and 5 kHz a boost current having a higher current value than that of the base current.

High pressure discharge lamp light source device

An extra high pressure mercury lamp that includes an arc tube, which includes a light emission section enclosing 0.2 mg/mmor more of mercury, sealing sections that respectively extend from both ends of the light emission section, a pair of electrodes that face each other in the light emission section, wherein an electrode axis portion of each electrode is held by the sealing portion, and a metallic foil that is buried in the sealing section and that is electrically connected with the electrode axis portion, wherein the metallic foil has a covering portion fixed to the electrode axis portion so as to roll up the electrode axis portion; an extended portion that extends towards the outside of a tube axis without being connected with the electrode axis portion; and a main body portion that extends from the extended portion.

Extra high pressure mercury lamp with each electrode held by a sealing portion

An electrode for an extra-high pressure discharge lamp, comprises large diameter portion which is symmetrical with respect to an axis of the electrode, a small diameter portion connected to the large diameter portion, wherein the large diameter portion is connected to the small diameter portion through an outer surface portion of the electrode, wherein a stripe lines like pattern portion, extending along an electrode axis direction, is formed on a portion to be brought in contact with glass of a lamp, and wherein unevenness is formed over an entire circumference of the electrode in a cross sectional view of the electrode taken along a direction perpendicular to the electrode axis direction.

Electrode and extra-high pressure discharge lamp using the same

Process for producing a discharge lamp having a silica discharge vessel with an emission space in which there is a pair of electrodes at least 0.15 mg/mmof mercury, argon (Ar), and halogen by measuring the relation b/a1 between the emission intensity aof argon (Ar) at a wavelength of 668 nm and the emission intensity b of OH radicals at a wavelength of 309 nm in a state of glow discharge of the discharge lamp; supplying hydrogen into the discharge vessel of the discharge lamp; measuring the relation c/abetween the emission intensity aof argon (Ar) at a wavelength of 668 nm and the emission intensity c of OH radicals at a wavelength of 309 nm in the state of glow discharge of the discharge lamp; and fixing the difference c/a&#x2212;b/aat a value in the range of 0.001 to 15.

Growing community of inventors

Hyogo, Japan

Takuya Tsukamoto