Incandescent lamp

Details Incandescent lamp Incandescent lamp

H - Electricity

01

K

313/10

H01K 1/34 (2006.01) H01K 1/26 (2006.01)

Patent

CA 1136687

Heinz SOVILLA COSSONAY/Switzerland "INCANDESCENT LAMP" ABSTRACT OF THE DISCLOSURE Incandescent lamp, in particular a halogen lamp, comprising an inner glass bulb that defines and limits an inner small space containing filament means, and at least one outer glass bulb spaced from and surrounding the inner bulb and defining at least one intermediate space. The inner glass bulb is a thick-walled quartz glass bulb that acts as a heat-storage and heat radiation reflecting means and closely surrounds the filament means, so that losses of energy by thermal convection and radiation are strongly reduced leading to an optimum luminous efficiency. For increasing the stability the wall of the inner bulb can be provided with a reinforcement of tungsten wires. Moreover the wall of the inner bulb can be made of foam glass containing inclusions of an infrared radiation absorbing substance as carbon dioxide gas and/or water vapor. The wall of the inner bulb can have openings for balancing the pressure on both sides,or can be surrounded by an intermediate space that is evacuated or filled with an infrared radiation absorbing gas. ------oooO ooo------ -1-

345825

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