Halogen incandescent lamp with filament positioning arrangement

Details Halogen incandescent lamp with filament positioning arrangement Halogen incandescent lamp with filament positioning arrangement

1996-06-05

1997-11-11

Patel, Ashok

Electric lamp and discharge devices

With gas or vapor

Incandescent filament lamp

313273, 313274, 313275, 313278, 313279, 313269, H01K 118

Patent

active

056867948

ABSTRACT:
To positively locate a filament (5, 22) in position within a bulb (2) of a halogen incandescent lamp, the walls of the bulb are deformed at selected points along the length of the filament within the bulb to define at least three inwardly projecting dimples which just barely engage, or engage, the filament. Preferably, the filament is formed with a connecting portion (7) in the region of engagement, which connecting portion is either straight, coiled with a very steep pitch, or, if the filament is double-coiled, only single-coiled. The connecting portion (7) may be electrically short-circuited by a core pin (39). If the bulb is single-ended (FIG. 3), a return lead (29) along the wall of the bulb, can be pinched between adjacent walls (45) of adjacent dimples. The dimples, looked at from the outside of the lamp, are essentially funnel-shaped and, in cross section, may be circular, or if space between adjacent dimples is insufficient, may be elliptical.

REFERENCES:
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patent: 3840953 (1974-10-01), Martin
patent: 3983441 (1976-09-01), Northrup
patent: 4052637 (1977-10-01), Op De Beeck
patent: 4096405 (1978-06-01), Goto
patent: 4876482 (1989-10-01), Stadler
patent: 4959586 (1990-09-01), Claessens et al.
patent: 5006757 (1991-04-01), Odagaki
patent: 5025188 (1991-06-01), Odagaki
patent: 5045748 (1991-09-01), Ahlgren et al.
patent: 5146134 (1992-09-01), Stadler et al.

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