Annulus fluorescent lamp with overheat protection

Details Annulus fluorescent lamp with overheat protection Annulus fluorescent lamp with overheat protection

1998-03-27

1999-11-02

Day, Michael

Electric lamp and discharge devices

With temperature modifier

For filament or heated cathode

315100, 315119, 313493, H01J 6156

Patent

active

059776927

ABSTRACT:
An annulus fluorescent lamp comprises two annulus fluorescent tubes formed into shapes having different diameters and disposed substantially concentrically in substantially the same plane. Each of the annulus fluorescent tubes has a first end with an electrode seal portion and a second end without electrodes. The second ends of the annulus fluorescent tubes are communicated with each other via a bridge portion so that a single discharge path is formed inside the plurality of annulus fluorescent tubes. The annulus fluorescent lamp also comprises a mouthpiece covering the first and second ends of the annulus fluorescent tubes, and a thermal fuse disposed in the mouthpiece and close to the electrode seal portion of the annulus fluorescent tubes. The thermal fuse is connected electrically between one of outer lead wires of the electrodes and one of lead terminals fixed to the mouthpiece. The thermal fuse is connected thermally to the surface of the annulus fluorescent tubes at a portion close to the electrode seal portion via a silicone resin. When the electrode seal portion is overheated in the last period of the lamp life, the thermal fuse cuts off current supply to the annulus fluorescent tubes.

REFERENCES:
patent: 4649320 (1987-03-01), Hough et al.
patent: 4857808 (1989-08-01), Lally et al.
patent: 5034655 (1991-07-01), Murayama et al.
patent: 5629586 (1997-05-01), Yasuda et al.
patent: 5723939 (1998-03-01), Okuno et al.
Communication from European Patent Office and attached Search Report.

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