Food refrigeration appliance with illuminated shelves, and method of producing the illuminated shelves

1. A food refrigeration appliance ( 1 ) comprising a casing ( 2 ); a food refrigeration chamber ( 3 ) housed inside said casing ( 2 ); at least one shelf ( 5 ) having a first food-supporting surface and a second opposite surface and adapted to be located inside said refrigeration chamber ( 3 ); and a lighting system ( 7 ), in turn comprising a number of light sources ( 7 a ) fixed to said shelf ( 5 ), and power means ( 8 , 10 ) for electrically powering said light sources ( 7 a ); said appliance being characterized in that said lighting system ( 7 ) comprises a protective layer ( 18 ) of electrically insulating material applied to at least one of said surfaces of the shelf ( 5 ) and a number of electrically conductive tracks ( 14 ) associated to at least one of said surfaces of the shelf ( 5 ) to define an electric circuit ( 9 ) connecting said light sources ( 7 a ) to said power means ( 8 , 10 ).

2. A food refrigeration appliance ( 1 ) comprising a casing ( 2 ); a food refrigeration chamber ( 3 ) housed inside said casing ( 2 ); at least one shelf ( 5 ) having a first food-supporting surface and a second opposite surface and adapted to be located inside said refrigeration chamber ( 3 ); power means ( 8 , 10 ) for electrically powering a number of light sources ( 7 a ) fixed to said shelf ( 5 ), and a lighting system ( 7 ), in turn comprising said light sources ( 7 a ) fixed to said shelf ( 5 ), a number of electrically conductive tracks ( 14 ) associated to at least one of said surfaces of the shelf ( 5 ) to define an electric circuit ( 9 ) connecting said light sources ( 7 a ) to said power means ( 8 , 10 ), and a supporting sheet ( 16 ) of electrically insulating material, wherein the light sources ( 7 a ) and the electrically conductive tracks ( 14 ) are provided on said supporting sheet ( 16 ) and the supporting sheet is applied to at least one of said surfaces of the shelf ( 5 ).

3. An appliance as claimed in claim 2 , wherein said electrically conductive tracks ( 14 ) are made of electrically conducting material deposited on said supporting sheet ( 16 ).

4. An appliance as claimed in claim 2 , wherein said supporting sheet ( 16 ) has an adhesive surface ( 16 a ) adapted to be glued to at least one of said surfaces of the shelf ( 5 ).

5. An appliance as claimed in claim 2 , wherein said supporting sheet ( 16 ) is made of transparent or semitransparent plastic material.

6. An appliance as claimed in claim 1 , wherein said electrically conductive tracks ( 14 ) are made of electrically conducting material deposited on at least one of said surfaces of the shelf ( 5 ).

7. An appliance as claimed in claim 2 , wherein said lighting system ( 7 ) comprises a protective layer ( 18 ) of electrically insulating material applied to at least one of said surfaces of the shelf ( 5 ) or to said supporting sheet ( 16 ) so as to cover the electrically conductive tracks ( 14 ).

8. An appliance as claimed in claim 7 , wherein said protective layer ( 18 ) is made of transparent or semitransparent material.

9. An appliance as claimed in claim 1 , wherein said shelf ( 5 ) is made of transparent or semitransparent plastic material.

10. An appliance as claimed in claim 1 , wherein said light sources ( 7 a ) comprise light emitting diodes ( 15 ).

11. An appliance as claimed in claim 1 , wherein said electrically conductive tracks ( 14 ) are made of electrically conducting paint and/or electrically conducting ink.

12. A method of producing an illuminated shelf of a food refrigeration appliance ( 1 ) comprising a casing ( 2 ); a food refrigeration chamber ( 3 ) housed inside said casing ( 2 ); and a lighting system ( 7 ), in turn comprising a number of light sources ( 7 a ), and power means ( 8 , 10 ) for electrically powering said light sources ( 7 a ) ; said shelf ( 5 ) having a first food-supporting surface and a second opposite surface and being located inside said refrigeration chamber ( 3 ); and said method being characterized by comprising the step of associating a number of light sources ( 7 a ) and a number of electrically conductive tracks ( 14 ) to at least one of said surfaces of the said shelf ( 5 ) to define an electric circuit ( 9 ) connecting light sources ( 7 a ) to said power means ( 8 , 10 ) and applying a protective layer ( 18 ) of electrically insulating material applied to at least one of said surfaces of the shelf ( 5 ).

13. A method of producing an illuminated shelf of a food refrigeration appliance ( 1 ) comprising a casing ( 2 ); a food refrigeration chamber ( 3 ) housed inside said casing ( 2 ); and a lighting system ( 7 ), in turn comprising a number of light sources ( 7 a ), and power means ( 8 , 10 ) for electrically powering said light sources ( 7 a ) ; said shelf ( 5 ) having a first food-supporting surface and a second opposite surface and being located inside said refrigeration chamber ( 3 ); and said method being characterized by comprising the steps of:

associating a number of light sources ( 7 a ) and a number of electrically conductive tracks ( 14 ) to at least one of said surfaces of the said shelf ( 5 ) to define an electric circuit ( 9 ) connecting light sources ( 7 a ) to said power means ( 8 , 10 );

providing said light sources ( 7 a ) and said electrically conductive tracks ( 14 ) on a supporting sheet ( 16 ) of electrically insulating material; and

applying said supporting sheet ( 16 ) to at least one of said surfaces of the shelf ( 5 ).

14. A method as claimed in claim 13 , comprising the step of depositing electrically conductive material on said supporting sheet ( 16 ) so as to form said electrically conductive tracks ( 14 ).

15. A method as claimed in claim 13 , comprising the step of providing said supporting sheet ( 16 ) with at least an adhesive surface ( 16 a ).

16. A method as claimed in claims 12 , comprising the step of depositing electrically conductive material on at least one of said surface ( 5 a ) of said shelf ( 5 ) to form said electrically conductive tracks ( 14 ).

17. A method as claimed in claim 16 , comprising the step of applying a protective sheet ( 18 ) of insulating material to at least one of said surface ( 5 a ) of the shelf ( 5 ) or to a supporting sheet ( 16 ) of electrically insulating material so as to cover the electrically conductive tracks ( 14 ).

18. A method as claimed in claim 16 , comprising the step of applying a number of light emitting diodes ( 15 ) to at least one of said surface ( 5 a ) of the shelf ( 5 ) or to said supporting sheet ( 16 ).

19. A method as claimed in claim 16 , comprising the step of stamping a number of lines of electrically conducting ink and/or electrically conducting paint on said surface ( 5 a ) of said shelf ( 5 ).