Electric lamp with pinch sealed outer conductor of non-highly re

Details Electric lamp with pinch sealed outer conductor of non-highly re Electric lamp with pinch sealed outer conductor of non-highly re

1987-07-29

1988-04-19

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

313633, 313579, H01J 105, H01J 6106, H01J 6136, H01K 140

Patent

active

047392193

ABSTRACT:
A lead wire arrangement used in the pinch seal of a tungsten halogen incandescent or air burning discharge lamp. The outer lead wires are made of an oxidation resistant material having a melting point significantly lower than the temperature surrounding the foil and lead wire arrangement during the pinch sealing process. Because the temperature reached during pinch sealing is of the order 2,000.degree. C. conventionally outer lead wires have been made of a highly refractory material, for example, molybdenum which has to be coated with platinum to prevent oxidation. The invention uses materials having significantly lower melting points than 2,000.degree. C. which are also oxidation resistant thus avoiding the use of the expensive platinum. Suitable materials for the outer lead wires include titanium wire, titanium coated wire, nickel/iron alloys and titanium/molybdenum alloys.

REFERENCES:
patent: 4039883 (1977-08-01), Damsteeg et al.
patent: 4219757 (1980-08-01), Rech et al.

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