Electric lamp vessel having a mirror coating with a sharply defi

Details Electric lamp vessel having a mirror coating with a sharply defi Electric lamp vessel having a mirror coating with a sharply defi

1987-04-16

1988-07-19

DeMeo, Palmer C.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Reflector

H01K 132, H01J 510

Patent

active

047587610

ABSTRACT:
The electric lamp has a lamp vessel of which a wall portion is mirror-coated at its inner surface with an aluminum layer. This wall portion has a boundary near the largest diameter of the lamp vessel. This boundary is adjoined by a thermally connected zone having a transparent aluminum oxide layer. In the lamp, a dark zone caused by a very thin aluminum layer adjoining the boundary is avoided.

REFERENCES:
patent: 2115839 (1938-05-01), Briefer
patent: 4633126 (1986-12-01), Giller et al.

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