Outer jacket leak detection method and ballast implementing...

Electric lamp and discharge devices – With gas or vapor – Having electrode lead-in or electrode support sealed to...

Reexamination Certificate

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C313S624000, C313S324000, C313S573000, C315S309000, C315S311000, C315S307000, C315S291000

Reexamination Certificate

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07619362

ABSTRACT:
A method of detecting a leak in an outer jacket of a metal halide lamp having an arc tube inside the outer jacket and operated by a ballast, where the ballast monitors an electrical characteristic of the lamp during start and detects a leak in the outer jacket when the electrical characteristic deviates from that of a corresponding metal halide lamp whose outer jacket does not have a leak. The electrical characteristic is one of six markers, namely (1) V′(E) at a predetermined E, where V′(E) is a derivative of lamp voltage V as a function of cumulative energy E delivered to the ballast since ignition, (2) a value of E at which V′(E) reaches a maximum, (3) V at a predetermined E, (4) a local maximum of V′(E) up to a predetermined E, (5) a global maximum of V′(E), and (6) E required to achieve a predetermined V.

REFERENCES:
patent: 7002305 (2006-02-01), Kambara et al.
patent: 7129647 (2006-10-01), DuLaney et al.
patent: 7382101 (2008-06-01), Fukuda et al.

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