Title:
LIGHT SOURCE DEVICE AND FILAMENT
Document Type and Number:
WIPO Patent Application WO/2013/099759
Kind Code:
A1
Abstract:
Provided is a light source device which is provided with a filament that has a high efficiency for converting electrical power into visible light.
A light source device of the present invention comprises: a light transmitting airtight container; a filament that is arranged within the light transmitting airtight container; and a lead wire for supplying an electric current to the filament. The filament comprises: a base that is formed of a metal material; and a visible light absorbing film that covers the base. The visible light absorbing film is transparent in the infrared region. As a result of this configuration, the reflectance of visible light is decreased and the reflectance of infrared light is increased, so that radiation of infrared light is suppressed and the luminous flux efficiency of visible light is able to be increased.
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Inventors:
KAWAKAMI YASUYUKI (JP)
MATSUMOTO TAKAHIRO (JP)
SAITO TAKAO (JP)
EMOTO KEI (JP)
MATSUMOTO TAKAHIRO (JP)
SAITO TAKAO (JP)
EMOTO KEI (JP)
Application Number:
PCT/JP2012/083088
Publication Date:
July 04, 2013
Filing Date:
December 20, 2012
Export Citation:
Assignee:
STANLEY ELECTRIC CO LTD (JP)
International Classes:
H01K1/04; H01K1/08
Foreign References:
| JP2011124206A | 2011-06-23 | |||
| JP2003168399A | 2003-06-13 | |||
| JP2000260398A | 2000-09-22 | |||
| JPS5572357A | 1980-05-31 | |||
| JP2006520074A | 2006-08-31 | |||
| JPS56145652A | 1981-11-12 | |||
| JPH10289689A | 1998-10-27 | |||
| JP2010272435A | 2010-12-02 | |||
| JP2000215858A | 2000-08-04 |
Attorney, Agent or Firm:
Sannozaka Patent Law Firm (JP)
Patent business corporation The Sanno hill patent firm (JP)
Patent business corporation The Sanno hill patent firm (JP)
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Claims: