End-of-life protection for compact fluorescent lamps

Details End-of-life protection for compact fluorescent lamps End-of-life protection for compact fluorescent lamps

2005-06-14

2005-06-14

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

C315S056000

Reexamination Certificate

active

06906465

ABSTRACT:
A self-ballasted fluorescent lamp (10) that comprises a housing (12) formed to contain a ballast. The housing (12) has a top surface (14) with openings (16) leading from the exterior of the housing (12) to the interior. The openings (16) can be in the form of raised bosses having upstanding walls (16a). A restricted portion (18), which can take the form of a flange, is formed with the opening (16) and a safe end-of-life enabling device (20) is positioned in the opening (16) and in contact with the restricted portion (18). The safe end-of-life device (20) is tubular, has low thermal conductivity and in preferred forms of the invention is a glass such as quartz or a ceramic such as aluminum oxide. The ends (22) of a fluorescent lamp (24) penetrate the tubular end-of-life device (20) and extend into the interior of the housing for suitable connection to an enclosed electronic ballast. A retainer (26) is positioned opposite the restricted portion for maintaining the end-of-life device within the opening. The retainer (26) is a typical compact fluorescent cement that is used to fix the lamp to the housing. Alternatively, the retainer can be an adhesive silicone or a threaded washer.

REFERENCES:
patent: 4288239 (1981-09-01), Hoeh
patent: 4924368 (1990-05-01), Northrop et al.
patent: 6033249 (2000-03-01), Holzer
patent: 6441874 (2002-08-01), Saito et al.
patent: 6555965 (2003-04-01), Oberle
patent: WO 01/56060 (2001-08-01), None

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