Matsushita Electric Industrial Co., Ltd.

Matsushita Electronics Corporation

Koichi Katase

Katsushi Seki

Tsuyoshi Ichibakase

Kenji Itaya

Mutsumi Mimasu

Akira Hochi

Kiyoshi Hashimotodani

Yuuji Omata

Takeshi Arakawa

Yoshihisa Hagiwara

A bulb type electrodeless discharge lamp, comprising a recessed part (), wherein the maximum diameter of a light emitting tube () is 60 to 90 mm and the tube wall load of the light emitting tube () is 0.07 to 0.11 W/cm, and a relation between the diameter Dc of the recessed part () and an interval &#x394;h between the top of the recessed part () and the top part of the light emitting tube () meets the requirement of &#x394;h&#x2266;1.15&#xd7;Dc+1.25 [mm].

Compact self-ballasted electrodeless discharge lamp and electrodeless-discharge-lamp lighting device

An electrodeless discharge lamp apparatus includes an electrodeless discharge lamp, a microwave resonator, and a microwave coupler. The microwave resonator includes a conductive reflecting mirror having an opening, a conductive shield, and two opposing external electrodes provided substantially on a central axis of the reflecting mirror. The electrodeless discharge lamp is disposed between the opposing external electrodes. The focal point of the reflecting mirror is positioned between the opposing external electrodes. When microwave energy is supplied to the microwave resonator via the microwave coupler, a microwave resonant electric field occurs between the opposing external electrodes, whereby discharge of the electrodeless discharge lamp occurs.

Electrodeless discharge lamp apparatus with adjustable exciting electrodes

Part of fluorescent lamp

An electrodeless discharge lamp includes an envelope filled with a luminescent material to be excited to emit light and a filling material that substantially does not discharge to emit light. The filling material stabilizes a discharge of the luminescent material.

Electrodeless discharge lamp

An electrodeless discharge lamp and an electrodeless discharge lamp apparatus which prevent the devitrification are provided, where the devitrification occurs due to the use of, as a luminescent substance, a metal halide, particularly a compound made up of a group IIIB metal and a halogen. The inventors recognize the cause of the devitrification as follows: atoms of the metal are dissociated from the luminescent substance and precipitate on the surface of the arc tube wall to melt it as the luminescent substance is excited and emits light. Based on this recognition, a substance is added to the interior of the arc tube to prevent the melting of the arc tube wall and extend the life of the lamp. More specifically, the added substance is another metal halide which contains a halogen, but the valence of the metal of the added metal halide is larger than that of the luminescent-substance metal halide. In addition to this, it is possible to control the ratio of the halogen in the arc tube by controlling the amount of the added metal halide. With this construction, occurrence of the devitrification is prevented while maintaining the discharge stability. The devitrification can also be prevented by adding a simple substance of the metal constituting the luminescent-substance metal halide.

Electrodeless discharge lamp and apparatus to prevent devitrification

A long life microwave electrodeless discharge lamp apparatus capable of preventing the generation of noise. The microwave electrodeless discharge lamp apparatus includes a magnetron having a magnetron tube and a yoke that surrounds the magnetron tube, a container housing at least the magnetron tube, a waveguide in which microwaves oscillated by the magnetron are propagated, an electrodeless discharge tube sealing luminescent materials excited by the microwaves to emit light, wherein a space surrounded by the yoke is communicated with the inside of the container, and wherein a fluid is sealed in the container. Thus, the magnetron tube is in a state in which it is immersed in the fluid.

Microwave electrodeless discharge lamp apparatus

A microwave-excited discharge lamp apparatus of the present invention has a translucent blow guide 6 arranged around a microwave-excited discharge lamp 4. Thereby, even when the microwave-excited discharge lamp 4 is reduced in size, the microwave-excited discharge lamp 4 can be cooled efficiently without complicating or increasing the size of the apparatus.

Microwave-excited discharge lamp apparatus

A microwave-excited discharge lamp (2) is constructed with a double-case structure consisting of an outer case (3) disposed in a microwave electromagnetic field, and an inner case (4) disposed inside the outer case.

Growing community of inventors

Osaka, Japan

Koichi Katase