ELECTRODELESS DISCHARGE LAMP - MATSUSHITA ELECTRIC WORKS LTD

Title:

ELECTRODELESS DISCHARGE LAMP

Document Type and Number:

WIPO Patent Application WO/2005/041245

Kind Code:

A1

Abstract:

An electrodeless discharge lamp comprises a gastight bulb made of a translucent material and filled with a discharge gas and a coupler (a coil assembly) housed in a cavity formed in the bulb. The coupler excites the discharge gas using a high-frequency electromagnetic field generated by flowing a high-frequency current through a coil so as to cause the discharge gas to emit light. The coupler comprises a tubular cylinder used for heat release and made of a thermal conductor, a skeletal bobbin fitted along the outer surface of the cylinder in the axial direction thereof, a core that is made of a soft magnetic material and arranged in an opening formed by the skeleton of the bobbin, thereby generally touching the cylinder, and a coil wound around the bobbin and the surface of the core. Since the core arranged in the opening formed by the skeleton generally touches the cylinder for heat release, the heat given to the coil by the heating bulb is released directly from the cylinder through the core.

Inventors:

KAKEHASHI HIDENORI (JP)
YAMAMOTO SHOHEI (JP)
HIRAMATSU KOJI (JP)
HIZUMA SHINJI (JP)
HARADA KEISUKE (JP)
SHIBATA YOSHINOBU (JP)

Application Number:

PCT/JP2003/013672

Publication Date:

May 06, 2005

Filing Date:

October 24, 2003

Export Citation:

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Assignee:

MATSUSHITA ELECTRIC WORKS LTD (JP)
KAKEHASHI HIDENORI (JP)
YAMAMOTO SHOHEI (JP)
HIRAMATSU KOJI (JP)
HIZUMA SHINJI (JP)
HARADA KEISUKE (JP)
SHIBATA YOSHINOBU (JP)

International Classes:

H01J5/50; H01J61/04; H01J65/04; (IPC1-7): H01J61/04

Foreign References:

JP2003257379A	2003-09-12
US5801493A	1998-09-01
JPS53105076A	1978-09-12
US20030132706A1	2003-07-17
JPS53105076A	1978-09-12

Other References: