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Method for producing a frosted envelope for a high-pressure discharge lamp
   
Document Number
US Patent 7396270
Issued Date
July 8, 2008
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Abstract
A high-pressure discharge lamp, in particular a mercury-free high-pressure discharge lamp for a vehicle headlight, has a lamp base (1) and an axially symmetrical discharge vessel (30), in whose discharge space (300) an ionizable filling, containing metal halides, and electrodes (31, 32) are arranged for producing a gas discharge. The discharge vessel (30) is provided with transparent, partial frosting (37), which is limited to a section of the inside or outside of the discharge vessel (30) extending over part of the discharge vessel circumference, this section having a well-defined position with respect to the lamp base (1). Moreover, a simple production method is proposed for partial frosting (37) which is preferably arranged on the inside of the discharge vessel (30).
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Number of Claims:
3
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Published
July 8, 2008
Application Number
11/049,986
Filed
February 4, 2005
US Classification
445/26   313/318.02 313/634 445/58 445/9
Int'l Classification
H01J   9/00   (20060101)   H01J   9/24   (20060101)  
Examiner
Attorney/Law Firm
Priority Data
Feb 05, 2004 [DE] 10 2004 005 903
USPTO Field of Search
445/26   445/58   445/14   445/22  
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