Title:
ULTRA-HIGH PRESSURE MERCURY LAMP
Document Type and Number:
WIPO Patent Application WO/2008/020582
Kind Code:
A1
Abstract:
A long-life ultra-high pressure mercury lamp in which flickering is eliminated
by varying the magnitude of a superposition pulse depending on the variation
of parameters in a light-emitting tube. In an ultra-high pressure mercury lamp
comprising a light-emitting tube having a pair of electrodes at the opposite
ends and filled with mercury, where a current pulse of the same polarity as that
of an AC lamp current is superposed on the AC lamp current when the ultra-high pressure
mercury lamp is lighted by being supplied with the AC lamp current, the lamp voltage
of the ultra-high pressure mercury lamp is detected and when the lamp voltage
exceeds a predetermined value, the width and/or the height of the current pulse
superposed on the AC lamp current is/are differentiated from the width and/or
the height of the current pulse when the lamp voltage has a predetermined value
depending on the lamp voltage value.
Inventors:
MATSUMOTO HIDEYUKI (JP)
Application Number:
PCT/JP2007/065815
Publication Date:
February 21, 2008
Filing Date:
August 13, 2007
Export Citation:
Assignee:
OSRAM GMBH (DE)
MATSUMOTO HIDEYUKI (JP)
MATSUMOTO HIDEYUKI (JP)
International Classes:
H05B41/24
Foreign References:
| JPH06163168A | 1994-06-10 | |||
| JP2004296427A | 2004-10-21 |
Attorney, Agent or Firm:
YANO, Toshio et al. (Shin-Marunouchi Center Building6-2, Marunouchi 1-chome, Chiyoda-ku Tokyo, JP)
Download PDF: