Title:
SUPER-HIGH PRESSURE MERCURY LAMP
Document Type and Number:
WIPO Patent Application WO/2008/010542
Kind Code:
A1
Abstract:
A super-high pressure mercury lamp in which wear of electrode is reduced even when
the temperature of an electrode on the opening side of the reflector of a light emitting
tube rises higher than the temperature of an electrode on the neck side of the reflector,
thereby causing a temperature difference between the electrodes of the light
emitting tube. An AC lighting system super-high pressure mercury lamp (10) comprises
a light emitting tube (1) having a first electrode (3a) located on the opening
(20) side of a reflector (5) and a second electrode (3b) on the neck (5a) side of
the reflector (5) and filled with mercury. When the super-high pressure mercury
lamp (10) is lighted by supplying an AC lamp current, a current pulse of the same
polarity as that of the AC lamp current is superposed on the AC lamp current, and
the pulse width of the current pulse to the first electrode (3a) is made larger than
the pulse width of the current pulse to the second electrode (3b).
Inventors:
MATSUMOTO HIDEYUKI (JP)
Application Number:
PCT/JP2007/064228
Publication Date:
January 24, 2008
Filing Date:
July 19, 2007
Export Citation:
Assignee:
OSRAM GMBH (DE)
MATSUMOTO HIDEYUKI (JP)
MATSUMOTO HIDEYUKI (JP)
International Classes:
H05B41/24; G03B21/14; H01J61/86; H01J61/88
Foreign References:
| JPS5914297A | 1984-01-25 | |||
| JP2003197386A | 2003-07-11 | |||
| JP2003133092A | 2003-05-09 | |||
| JP2003059684A | 2003-02-28 | |||
| JP2001244088A | 2001-09-07 |
Other References:
See also references of EP 2046097A4
Attorney, Agent or Firm:
YANO, Toshio et al. (PATENT OFFICE Shin-Marunouchi Center,Building, 6-2, Marunouchi 1-chom, Chiyoda-ku Tokyo 05, JP)
Download PDF: