High-pressure discharge lamp and holder structure for an arc dis

Details High-pressure discharge lamp and holder structure for an arc dis High-pressure discharge lamp and holder structure for an arc dis

1990-06-18

1991-12-24

O'Shea, Sandra L.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313634, 445 26, H01J 926, H01J 1702, H01J 6134

Patent

active

050755862

ABSTRACT:
To guide a double-ended arc tube (8) within an outer bulb (2), a sheet me guide element (17, 17') is secured to a support rod (12) of a holder structure (6a, 6b, 7, 12) extending within the bulb, the sheet metal part (17) having a major surface extending at least approximately transversely to the lamp axis (A) and being formed with an opening (24) fitting around and loosely, resiliently recieving a press seal (10) of the arc discharge tube (8). Preferably, the opening (24) is rectangular, and depending flaps (25, 26) extend from the sides of the opening to resiliently grip the press seal. The flaps may be reduced adjacent their junction with the rim (22, 23) surrounding the opening (24) of the guide element, so that a single guide element can receive different sizes of arc tubes having differently shaped press seals (10, 15). The holder effectively compensates for thermal expansion of materials in operation of the lamp, while securing the arc tube reliably in position even when subjected to shock or vibration.

REFERENCES:
patent: 2562887 (1951-08-01), Beese
patent: 2671183 (1954-03-01), St. Louis et al.
patent: 4829210 (1989-05-01), Benson et al.

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