Electric incandescent lamp provided with different pitch...

Details Electric incandescent lamp provided with different pitch... Electric incandescent lamp provided with different pitch...

2005-08-02

2008-11-25

Santiago, Mariceli (Department: 2879)

Electric lamp and discharge devices

Incandescent lamps

C313S341000, C313S344000, C313S578000

Reexamination Certificate

active

07456558

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.

REFERENCES:
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Anonymous “Differential Pitch Helix Coil for Copier Lamp” Research Disclosure, Mason Publications, Hampshire, GB Mar. 14, 1989.

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