Title:
DISCHARGE LAMP
Document Type and Number:
WIPO Patent Application WO/2014/208392
Kind Code:
A1
Abstract:
A discharge lamp obtained by adding an emitter other than thorium to a cathode inside a light-emitting tube, wherein the emitter is prevented from being excessively vaporized from the cathode and prematurely depleted, and efficient illumination is enabled even at start-up. A main body (31) of a cathode (3) is composed of a refractory metal material that does not contain thorium, and the tip (32) is composed of a refractory metal material containing an emitter (excepting thorium). Inside a sealed space (33) formed in the interior of the main body (31) and/or the tip (32) is embedded a sintered compact (34) containing an emitter (excepting thorium) that is higher in density than the emitter contained in the tip (32).
Inventors:
TAGAWA YUKIHARU (JP)
ARIMOTO TOMOYOSHI (JP)
FUNAKOSHI MITSUO (JP)
YASUDA YUKIO (JP)
IWABAYASHI HIROHISA (JP)
ARIMOTO TOMOYOSHI (JP)
FUNAKOSHI MITSUO (JP)
YASUDA YUKIO (JP)
IWABAYASHI HIROHISA (JP)
Application Number:
PCT/JP2014/065963
Publication Date:
December 31, 2014
Filing Date:
June 17, 2014
Export Citation:
Assignee:
USHIO ELECTRIC INC (JP)
International Classes:
H01J61/06; H01J61/073
Foreign References:
| JP3175592B2 | 2001-06-11 | |||
| JP2732452B2 | 1998-03-30 | |||
| JP2010153339A | 2010-07-08 | |||
| JP2003217438A | 2003-07-31 | |||
| JP2002056807A | 2002-02-22 | |||
| JP2012015008A | 2012-01-19 | |||
| JP2005519435A | 2005-06-30 | |||
| JP2002141018A | 2002-05-17 |
Other References:
See also references of EP 3016132A4
Attorney, Agent or Firm:
ISOHATA MASAO (JP)
Yasuo Isohata (JP)
Yasuo Isohata (JP)
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