Explosion-protected high-pressure discharge lamp

Details Explosion-protected high-pressure discharge lamp Explosion-protected high-pressure discharge lamp

1993-08-03

1995-08-29

O'Shea, Sandra L.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313261, 313292, H01J 6100

Patent

active

054463360

ABSTRACT:
To facilitate manufacture and assembly of a high-pressure discharge lamp ing an inner discharge vessel (4) within an outer bulb (1), and which is protected against explosion or bursting of the discharge vessel by a protective sleeve or body (8), typically formed of two sleeves or tubes (8a, 8b) of quartz glass or hard glass, the two glass tubes surround the discharge vessel (4) over its entire coaxial length and, when coated with an infrared (IR) reflective coating and an ultraviolet (UV) radiation coating, additionally function as a heat retention or heat damming element and a UV radiation protective element. Two ceramic insulating centering and holding elements are carried by a lamp holder structure (9), engaging the open ends of the glass tubes (8a, 8a). The ceramic elements are formed with steps (20a, 20b, 20c) or grooves (520a, 520b) to position the glass tubes spaced from each other and concentric with respect to the discharge vessel. Openings (13, 513) in the ceramic elements permit passage of the connecting leads (6) to the discharge vessel (4). The ceramic elements can be cruciform, star or spider-shaped, or ring-shaped with an apertured web or a transverse rib (19), to provide for pneumatic communication to the interior of the protective body (8) and easy evacuation of the outer bulb (1).

REFERENCES:
patent: 4401913 (1983-08-01), Koza et al.
patent: 4665344 (1987-05-01), Kajihara et al.
patent: 4839565 (1989-06-01), Osteen
patent: 4866327 (1989-09-01), Fischer et al.
patent: 4975620 (1990-12-01), Masui et al.
patent: 5023506 (1991-06-01), Canale et al.
patent: 5039912 (1991-08-01), Van Vliet et al.
patent: 5075586 (1991-12-01), Jaeger et al.

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