Method for producing a frosted envelope for a high-pressure discharge lamp
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United States of America Patent
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Jul 8, 2008
Grant Date -
Aug 11, 2005
app pub date -
Feb 4, 2005
filing date -
Feb 5, 2004
priority date (Note) -
Expired
status (Latency Note)
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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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