Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Shinichi Irisawa0
Takeshi Fukuyo0
Akira Homma0
Michio Takagaki0
Date of Patent
January 1, 2008
Patent Application Number
11177360
Date Filed
July 11, 2005
Patent Primary Examiner
Patent abstract
A discharge bulb is provided with an arc tube main body in which an arc tube having a discharge light emitting portion (a hermetically sealed glass envelope) where electrodes are provided in such a manner as to face each other is enclosed in a cylindrical shroud glass tube. The discharge bulb is configured so that a light distribution pattern having a predetermined cut-off line is formed by light intercepting portions (light intercepting films) and a light distribution control reflector. A frost treatment is applied to only a light emitting area on an outer surface of the shroud glass tube which corresponds to an area along the cut-off line in the light distribution pattern.
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