Arc discharge lamp with electrodeless ultraviolet radiation star

Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Discharge device load

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315267, 315 59, 315150, 315289, H01J 744

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048127140

ABSTRACT:
A metal halide arc discharge lamp comprises an arc tube containing a chemical fill including mercury and metal halides and having first and second electrodes respectively sealed at opposite ends thereof. An outer envelope surrounds the arc tube and has first and second terminals for electrical connection thereto. An electrodeless source of ultraviolet radiation is provided within the outer envelope proximate the arc tube for producing radiation which illuminates the path between the electrodes of the arc tube to decrease the amount of time for generating a gaseous discharge therebetween. The ultraviolet light source includes an envelope of ultraviolet light transmitting material having opposing ends. Portions of the envelope of the ultraviolet light source are capacitively coupled across the electrodes of the arc tube such that the source produces ultraviolet radiation during lamp starting when the first and second terminals of the lamp are energized.

REFERENCES:
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patent: 3900761 (1975-08-01), Freese et al.
patent: 4041352 (1977-08-01), Mc Neill et al.
patent: 4053814 (1977-10-01), Regan et al.
patent: 4097777 (1978-06-01), Bacharowski
patent: 4325004 (1982-04-01), Proud et al.
patent: 4328446 (1982-05-01), Fallier et al.
patent: 4355261 (1982-10-01), Cohen et al.
patent: 4721888 (1988-01-01), Proud et al.

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