High pressure sodium lamp substantially preventing movement of m

Details High pressure sodium lamp substantially preventing movement of m High pressure sodium lamp substantially preventing movement of m

1987-06-11

1990-03-20

Wieder, Kenneth

Electric lamp and discharge devices

Having vapor generating material

Electrode or electrode support includes material

313623, H01J 6128, H01J 6136

Patent

active

049104306

ABSTRACT:
A high pressure sodium lamp includes a light permeable ceramic bulb wherein a pair of electrodes are oppositely arranged. One of the electrodes is inserted into one end of a metal tube, the other end of which is pinched. The center line average surface roughness of the inner surface of the metal tube is held below 2 .mu.m for preventing melted sodium-mercury amalgam condensed on the inner surface of the other end of the metal tube from moving along the inner surface of the metal tube by capillary action toward the one end thereof.

REFERENCES:
patent: 4065691 (1977-12-01), McVey
"Interface Engineering", first edition issued on Dec. 20, 1986, published by Kyoritsu Publishing Co.
Electrical Engineering Materials, A. Dekker, Prentice-Hall, Inc., 1/59, pp. 15 and 16.

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