Incandescent lamp

Details Incandescent lamp Incandescent lamp

1996-03-29

1998-02-17

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

Incandescent filament lamp

313579, 313580, 313635, 313112, H01K 132

Patent

active

057194688

ABSTRACT:
An incandescent lamp has an envelope including a cylindrical portion and two hemispherical portions. Each hemispherical portion includes a second order curve which has a focus and is connected at one end of the cylindrical portion, respectively. A filament is provided along the central axis of the envelope and is located within and extends beyond a space surrounded by the cylindrical portion. An optical interference layer is arranged on a surface of the envelope to reflect infrared rays and transmit visible rays.

REFERENCES:
patent: 4492893 (1985-01-01), Steiner et al.
patent: 5017825 (1991-05-01), Heijnen et al.
patent: 5548182 (1996-08-01), Bunk et al.

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