Single-ended low-power discharge lamp, and method of its manufac

Details Single-ended low-power discharge lamp, and method of its manufac Single-ended low-power discharge lamp, and method of its manufac

1993-09-22

1996-06-18

O'Shea, Sandra L.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313623, 313631, 313632, H01J 162, H01J 1718, H01J 1704

Patent

active

055281010

ABSTRACT:
The discharge or arc tube chamber of a low-power high-pressure discharge lamp is, in one single step, sealed and shaped by mold or form-blowing by using pinch or press jaws (30, 31) which have concave hollows (34) formed therein to clearly define the shape of the discharge vessel, and hence of the discharge or arc tube chamber, to permit reproducible results with little variation between individual lamps to be made in a single manufacturing step. Additionally, an inclined ramp-like surface can be formed at the narrow sides (14) of the pinch seal extending towards the walls (11) of the discharge chamber (3) to thereby eliminate pockets beneath the electrodes. Preferably, the electrode shafts diverge with respect to the optical axis (A) of the lamp to increase the electrode spacing, and thus permit operation at a lower operating pressure, with respect to prior art lamps.

REFERENCES:
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patent: 5142195 (1992-08-01), Heider et al.
JP-A-56 168 318, Patent Abstracts of Japan, vol. 6, No. 55, Apr., 1982, Mubishi Denki K.K.
JP-A-01 220 362, Patent Abstracts of Japan, vol. 13, No. 534, Nov. 1989, Toshiba Corp.

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