Metallic Concave Reflection Mirror, Light Source and Light Source Apparatus Using the Same, and Lighting Circuit Thereof
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United States of America Patent
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Issued Date -
Feb 21, 2008
app pub date -
Sep 14, 2004
filing date -
Sep 14, 2004
priority date (Note) -
Abandoned
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Abstract
This invention makes it possible to use a concave reflection mirror using metal in at least a concave reflective portion thereof for discharge lamps. The concave reflection mirror is characterized by including: a metallic concave reflective portion; and a neck portion for receiving therein a high voltage side seal portion of a high-pressure discharge lamp to be continuously applied with a d.c. voltage of 1000 V to 4000 V during an ignition phase, the neck portion protruding rearward from a central portion of the metallic concave reflective portion and being formed partially of an insulating member or entirely of an insulating material. The concave reflection mirror can have a concave reflective surface with improved curved surface precision thereby making it possible to reduce variations in brightness, use a multi-layered deposited film having a low heat resistance, and reduce the required cost considerably.
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