Title:
LIGHTING METHOD OF HIGH-PRESSURE MERCURY LAMP
Document Type and Number:
Japanese Patent JP3125769
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a lighting method of high-pressure discharge lamps having mercury particles all over electrodes at starts of lighting, that can ensure their transition to a stable lighting state free of quenching when they are lighted.
SOLUTION: In an initial lighting phase, the electrical polarity applied to each electrode 4 is changed over in a shorter period or before mercury particles sticking to the electrode 4 to from a discharge point vapors out with the result that the discharge point is shifted, until the electrode 4 has a thermal spot to provide a stable discharge upon which the lighting is ensured by a preset frequency or by a direct current.
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Inventors:
Takashi Ito
Akihiko Sugitani
Akihiko Sugitani
Application Number:
JP30923598A
Publication Date:
January 22, 2001
Filing Date:
October 29, 1998
Export Citation:
Assignee:
Ushio, Inc.
International Classes:
H01J61/54; H01J61/56; H05B41/16; H05B41/24; (IPC1-7): H01J61/54; H01J61/56; H05B41/16
Domestic Patent References:
| JP652830A | ||||
| JP684504A |