Slotted electrode for high intensity discharge lamp

Details Slotted electrode for high intensity discharge lamp Slotted electrode for high intensity discharge lamp

2007-02-13

2007-02-13

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices

With gas or vapor

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

C313S624000, C313S623000, C313S260000

Reexamination Certificate

active

11080289

ABSTRACT:
Operation of an HID lamp may be improved by forming a glow generating recess on an exterior side the electrode. The lamp may be of standard construction with a light transmissive lamp envelope having a wall defining an enclosed volume. At least one electrode assembly is extended in a sealed fashion from the exterior of the lamp through the lamp envelope wall to be exposed at an inner end of the electrode assembly to the enclosed volume. A metal halide lamp fill is enclosed with an inert fill gas. The inner end of the electrode is formed with a recess having a least spanning dimension S and a recess depth of D where S is greater the electron ionization mean free path but less than twice the cathode fall plus negative glow distances, throughout the glow discharge phase of starting, for the chosen fill gas composition and pressure (cold).

REFERENCES:
patent: 3248586 (1966-04-01), Schlegel
patent: 3248591 (1966-04-01), Arndt
patent: 3303377 (1967-02-01), Jansen
patent: 3930176 (1975-12-01), Panico
patent: 4117367 (1978-09-01), De Bie et al.
patent: 5327045 (1994-07-01), Fox
patent: 6211615 (2001-04-01), Altmann
patent: 6437509 (2002-08-01), Eggers
patent: 2002/0195941 (2002-12-01), Yang

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