LAMP
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United States of America Patent
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N/A
Issued Date -
Apr 11, 2013
app pub date -
Jul 27, 2011
filing date -
Aug 26, 2010
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The present invention relates to a lamp having a spacer which is made of a thin metal plate being put on a closed end of an inner tube and held between the inner tube and the outer tube for keeping a predetermined constant distance therebetween for coaxially arranging the inner tube and the outer tube. In order to reduce the deepness of the shadow caused by strips of the spacer that shield light emitting through the inner tube, the spacer is attached to an exhaust portion protruding from a center of the closed end of the inner tube by inserting the exhaust portion into a hole, and strips, - - - extending in the direction of the opening end of the inner tube from peripheral edge of the center plate are inclined in a circumferential direction around an optical axis of the lamp.
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