Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope
Patent
1995-05-09
1997-07-08
Patel, Nimeshkumar
Electric lamp and discharge devices
With temperature modifier
Double wall, jacket or casing for envelope
313634, 313112, 313117, H01J 6135
Patent
active
056464711
ABSTRACT:
The capped high-pressure discharge lamp suitable for use in a vehicle headlight has a discharge vessel which is surrounded by an outer envelope. Current conductors extend from a respective electrode to a respective contact at a cap in which a first neck-shaped portion of the discharge vessel is secured. A return portion of one current conductor extends along an outside surface of the outer envelope. The outer envelope has a light-absorbing coating in a region near the first neck-shaped portion, at a side which is remote from the return portion. The outer envelope may have band-shaped coatings at either side, aside from the discharge path between the electrodes, at its side which faces the return portion. Stray light in the beam formed by the reflector and the lens of a head-light in which the lamp is used, is obviated. The bands provide for a rectilinear light/dark transition in said beam.
REFERENCES:
patent: 4307315 (1981-12-01), Meulemans et al.
patent: 4794297 (1988-12-01), Gaugel et al.
Scholler Klaus
Tiesler-Wittig Helmut
Egbert Walter M.
Patel Nimeshkumar
U.S. Philips Corporation
Wieghaus Brian J.
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