High pressure discharge lamps with means for reducing rectificat

Details High pressure discharge lamps with means for reducing rectificat High pressure discharge lamps with means for reducing rectificat

1982-09-03

1985-09-03

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

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

313625, 313626, 313634, H01J 61073, H01J 6120, H01J 6122, H01J 6136

Patent

active

045395110

ABSTRACT:
In a high pressure sodium discharge lamp it has been found that rectification can be prevented by ensuring the amalgam does not make electrical contact with the electrode. To achieve this according to the invention a small shoulder member is provided on the inside face of the end wall. Although the small height effectively reduces the temperature differential between the bottom of the shoulder and the top the necessary differential to prevent the amalgam condensing out the top of the shoulder member is maintained by ensuring the width of the shoulder member is a predetermined minimum thickness.

REFERENCES:
patent: 3609437 (1971-09-01), Tol et al.
patent: 4160930 (1979-07-01), Driessen et al.
"Extending the Life of Low-Power High-Pressure Sodium Lamps", P. L. Denbigh, BSc. MInstP, vol. 15, No. 4, 1983, pp. 171-178.

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