Matsushita Electric Industrial Co., Ltd.

Ryo Minamihata

Mamoru Takeda

Kiyoshi Takahashi

Yuriko Kaneko

Hideaki Kiryu

Takayuki Murase

Makoto Horiuchi

Masato Yoshida

Yoshitaka Kurimoto

Kazuhisa Tanaka

Tsuyoshi Nagakura

A discharge lampcomprises a luminous bulbin which a luminous materialis encapsulated and a pair of electrodesare arranged to be opposed to each other, and sealing parts () that are formed at both ends of the luminous bulband in which metal foil structureselectrically connected to the pair of electrodes, respectively, are sealed. At least one of the metal foil structuresis composed of a first metal foil, a second metal foiland a metal barcoupling both of them. At least one sealing partof the sealing parts includes a cavityaround the position where in the sealing part the metal baris located, and at least a rare gas is encapsulated in the cavity

Discharge lamp, method for fabricating the same and lamp unit

Mercury-free high-intensity discharge lamp operating apparatus and mercury-free metal halide lamp

A high-intensity discharge lamp includes an arc tube including a pair of electrodes opposed to each other therein; and a trigger wire made of a conductive material provided in an outer circumference of the arc tube. The trigger wire is turned to be in a conductive state with one electrode of the pair of electrodes when a start-up voltage is applied across the pair of electrodes, and discharge is started between the pair of electrodes in a state where an electrical field is formed between the trigger wire that is in the conductive state and the other electrode of the pair of electrodes.

High-intensity discharge lamp and high-intensity discharge lamp operating apparatus

In a high intensity discharge lamp, at least one of an arc bend amount and an apparent width of arc is controlled by a simple configuration at low cost. A high intensity discharge lamp system has a high intensity discharge lamp and an operating circuit for driving the high intensity discharge lamp . In the high intensity discharge lamp , a rare gas and a filling material containing a metal halide as a light generating substance are enclosed in the arc tube provided with a pair of electrodes a and b. The lamp system is disposed such that the line connecting the electrodes a and b is horizontal, and by applying a magnetic field having a vertical magnetic flux thereto and by varying the frequency of alternating current for driving the high intensity discharge lamp , at least one of an arc bend amount and an apparent width of arc can be easily controlled.

High intensity discharge lamp, driving apparatus for high intensity discharge lamp, and high intensity discharge lamp system

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Hyogo, Japan

Ryo Minamihata