Discharge tube having a double-tube type structure

Details Discharge tube having a double-tube type structure Discharge tube having a double-tube type structure

1992-07-27

1994-10-25

Yusko, Donald J.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313 25, 313113, 313242, 313634, H01J 516, H01J 152, H01J 6130

Patent

active

053592557

ABSTRACT:
A discharge tube for emitting light of the present invention includes an inner bulb including a hollow portion for defining therein an arc discharge chamber which encloses therein gas for emitting light, the inner bulb further including a pair of electrodes and a pair of metal members each of which is connected to a corresponding one of the pair of electrodes, the pair of electrodes being projected in the arc discharge chamber from the inner bulb and the pair of metal members being projected outwardly of the inner bulb, the hollow portion having an outer diameter of a first value and an outer tube for sealingly enclosing therein the inner bulb, the outer tube including a small-diameter portion having an outer diameter of a second value which is equal to or smaller than the first value, wherein the inner bulb is held in the interior of the outer tube, with a gap being formed between an outer surface of the inner bulb and an inner surface of the outer tube, in such a manner that the outer tube supports the metal members projected outwardly of the inner bulb.

REFERENCES:
patent: 3341731 (1967-09-01), Wilson
patent: 3619682 (1971-11-01), Lo et al.
patent: 3988626 (1976-10-01), Boudouris
patent: 4791333 (1988-12-01), Morris et al.
patent: 4935668 (1990-06-01), Hansler et al.
patent: 4982132 (1991-01-01), Meyer et al.
patent: 5032758 (1991-07-01), Davenport et al.
patent: 5045748 (1991-09-01), Ahlgren et al.
patent: 5059865 (1991-10-01), Bergman et al.
patent: 5128589 (1992-07-01), Dakin
patent: 5233264 (1993-08-01), Tiesler et al.
"Designing with Metal Halide Lamps" (pp. 59-68 of Electrode-Optical Systems Design published in Mar. of 1981.
Patent Abstracts of Japan vol. 15, No. 170 (E-1062), Apr. 30, 1991 (JPA 03 037 951).

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