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Title:
DISCHARGE LAMP FIXTURE
Document Type and Number:
Japanese Patent JP2008186635
Kind Code:
A
Abstract:

To prevent occurrence of malfunction caused by an incomplete connecting state between a connecting terminal connected to an electrode of a cold cathode discharge lamp and a connecter connected to a lighting device.

A protecting circuit 71 opens a feed path from a direct current power supply DC and stops an inverter circuit INV by switching off a switching switch part S when an output of a detecting circuit 70 reaches L level, and closes the feeding path from the direct current power supply DC and activates the inverter circuit INV by switching on the switching switch part S when the output of the detecting circuit 70 reaches H level. Accordingly, if at least either one of a pair of the connecting terminal parts 36, 36 and the connectors 50, 50 is in the incomplete connecting state, since the output of the detecting circuit 70 reaches the L level and the protecting circuit 71 stops operation of the inverter circuit INV, it is possible to prevent that a cold cathode fluorescent lamp 3 is kept lighted in the incomplete connecting state.


Inventors:
MATSUZAKI JUN
YAMASHITA KOJI
NARUO MASAHIRO
TATENO YOJI
Application Number:
JP2007017092A
Publication Date:
August 14, 2008
Filing Date:
January 26, 2007
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC WORKS LTD
International Classes:
H05B41/24; F21V19/00; F21V25/04; H05B41/14; F21S9/02
Domestic Patent References:
JPH06260293A1994-09-16
JP2002023657A2002-01-23
JPH07106077A1995-04-21
JPH1069994A1998-03-10
Attorney, Agent or Firm:
Keisei Nishikawa
Atsuo Mori