Electric incandescent lamp provided with different pitch factors for each end of a filament component
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United States of America Patent
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Nov 25, 2008
Grant Date -
Feb 23, 2006
app pub date -
Aug 2, 2005
filing date -
Aug 19, 2004
priority date (Note) -
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Abstract
The invention relates to an electric incandescent lamp, in particular a vehicle headlight, having at least one incandescent filament which is arranged within a light-permeable lamp vessel, the at least one incandescent filament having different pitch factors at its two ends. In order to increase the luminance at the light/dark boundary of the lower beam, that end of the incandescent filament which is near to the base has a lower pitch factor.
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