Methods and apparatus for illuminating an area

F - Mech Eng,Light,Heat,Weapons – 21 – V

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Details

F21V 33/00 (2006.01) F21V 19/00 (2006.01) F25D 27/00 (2006.01) F27D 21/02 (2006.01) F21V 31/00 (2006.01)

Patent

CA 2410500

A light source for illuminating an area includes a cold cathode light source (82), and input and an output, and a converter (78) coupled to the light source. The converter changes the current from an input alternating current supply to a lamp alternating current supply suitable for operating the lamp, for example from utility line voltage and current and changing it to an oscillating direct current supply. A display case such as a refrigeration unit may include an alternating current supply and a light source for illuminating an area within the display case. A current converter is coupled between the alternating current supply and the light source for changing the current from the supply at one voltage and frequency to a second voltage and a second frequency. In one preferred form, the light source is a cold cathode lamp at about 8500 Kelvin to include more blue light.

L'invention porte: sur une source (82) d'éclairage à cathode froide munie d'une entrée et d'une sortie, et sur un convertisseur (78) y étant connecté. Ledit convertisseur transforme le courant alternatif d'entrée en un courant alternatif convenant à l'alimentation de la lampe, par exemple le courant du secteur en courant continu oscillant; sur un présentoir par exemple réfrigéré pouvant comporter une alimentation en courant alternatif et une source lumineuse éclairant une partie du présentoir; et sur un convertisseur relié à l'alimentation en courant alternatif et à la source lumineuse transformant la tension et la fréquence de l'alimentation en courant alternatif en une deuxième tension et en une deuxième fréquence. Dans l'exécution préférée la source lumineuse est une lampe à cathode froide donnant une lumière d'environ 8500 Kelvin plus riche en bleu.

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