Title:
DEVICE FOR OPERATING HIGH-PRESSURE DISCHARGE LAMP AND ILLUMINATION INSTRUMENT USING THE DEVICE
Document Type and Number:
WIPO Patent Application WO/2005/057990
Kind Code:
A1
Abstract:
Even when a DC output voltage of a step-down chopper circuit (3) is lowered than the voltage when a lamp is turned OFF or when no load is applied, by discharge generated between conductors (105a) of a cable (104), an ON/OFF judgment unit (26a) does not determine erroneously that the discharge is a discharge in a discharge lamp (4). Accordingly, by intermittently applying a high-pressure pulse voltage while continuing the operation of a timer unit (29), no continuous discharge is generated between the conductors (105a) and it is possible to prevent abnormal heating of the cable (104). Moreover, when discharge is generated in a bulb of the discharge lamp (4), the ON/OFF judgment unit (26a) does not determine erroneously that it is an ON state. Thus, it is possible to suppress abnormal heating of respective components including a socket (102).
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Inventors:
YAMASHITA KOJI (JP)
KISHIMOTO AKIHIRO (JP)
NORO KOJI (JP)
SASAKI TOSHIAKI (JP)
FUKUMORI NORIYUKI (JP)
KISHIMOTO AKIHIRO (JP)
NORO KOJI (JP)
SASAKI TOSHIAKI (JP)
FUKUMORI NORIYUKI (JP)
Application Number:
PCT/JP2004/017406
Publication Date:
June 23, 2005
Filing Date:
November 24, 2004
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS LTD (JP)
YAMASHITA KOJI (JP)
KISHIMOTO AKIHIRO (JP)
NORO KOJI (JP)
SASAKI TOSHIAKI (JP)
FUKUMORI NORIYUKI (JP)
YAMASHITA KOJI (JP)
KISHIMOTO AKIHIRO (JP)
NORO KOJI (JP)
SASAKI TOSHIAKI (JP)
FUKUMORI NORIYUKI (JP)
International Classes:
H05B41/288; (IPC1-7): H05B41/18; F21V23/00; H05B41/24
Foreign References:
| JPS63307695A | 1988-12-15 | |||
| JP2562816B2 | 1996-12-11 |
Other References:
See also references of EP 1694101A4
Attorney, Agent or Firm:
Kawamiya, Osamu (IMP Building 3-7, Shiromi 1-chome, Chuo-ku, Osaka-sh, Osaka 01, JP)
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