Fluorescent lamp having the cathode and anode with particular an

Details Fluorescent lamp having the cathode and anode with particular an Fluorescent lamp having the cathode and anode with particular an

1999-01-28

2000-09-19

Day, Michael H.

Electric lamp and discharge devices

With gas or vapor

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

313491, 313492, 313632, 313631, H01J 1718, H01J 6136

Patent

active

06121728&

ABSTRACT:
A fluorescent lamp includes a bulb, a fluorescent material coated on an internal surface of the bulb, a stem, a discharge chamber filled with gas and mercury, a thermal cathode filament coated with electron emitting material, an anode, a pair of lead wires passing air-tightly through the stem and supporting the thermal cathode filament, and a lead wire supporting the anode. The anode is a substantially rectangular plate, and is substantially parallel to the thermal cathode filament in a cross sectional view taken along a bulb axis Z. The thermal cathode filament and the rectangular anode plate can be configured of an angle range of 30-60 degrees in a cross sectional view perpendicular to the lamp axis Z. The rectangular anode plate and the lead wire supporting the anode can be attached to each other in a substantially flag-shaped configuration. The invention produces a smaller discharge spot to improve thermal electron emission efficiency such that efficiency of the fluorescent lamp is improved. Furthermore, over-all size reduction of a fluorescent lamp is possible.

REFERENCES:
patent: 2403184 (1946-07-01), Lemmers
patent: 3369143 (1968-02-01), Etal et al.
patent: 4962334 (1990-10-01), Godyak
patent: 5049785 (1991-09-01), Shaffer
patent: 5298834 (1994-03-01), Oda et al.
patent: 5932970 (1999-08-01), Chiba et al.

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