Ground-embedded air cooled lighting device, in particular floodlight or sealed lamp

• US 20040156191A1
• Filed: 05/19/2003
• Published: 08/12/2004
• Est. Priority Date: 02/12/2003
• Status: Active Grant

• Current Assignee: Francesco Biasoli, Francis Roche
• Original Assignee: Francesco Biasoli, Francis Roche
• Inventors: Biasoli, Francesco, Roche, Francis
• Granted Patent: US 7,021,793 B2
• Time in Patent Office: Days
• US Class Current: 362/153.1
• CPC Class Codes: F21S 8/022 intended to be recessed in a floor or like ground surface, e.g. pavement or false floor
• CPC Class Codes: F21V 29/67 characterised by the arrangement of fans

Abstract

Lighting device, in particular a floodlight such as a sealed lamp embedded in a ground, emitting a directional light beam upward directed, comprising:

an optical deflector,

a light source mounted at a focus of said reflector,

a power supply unit for power supplying said light source,

a disc element supporting a translucid material for allowing light to pass therethrough,

characterized in that said lighting device further comprises:

a fan to supply air to an inside of said lighting device, so as to allow to remove the heat from said light source, and electric elements for power supplying said fan and an air conveying assembly including a body and tube allowing said air to circulate through a closed loop and allowing said translucid material used for conveying light to an outside environment to be cooled.

Claims

1. A lighting device, in particular a floodlight such as a sealed lamp embedded in a ground, emitting a directional light beam upward directed, comprising:

an optical deflector,

a light source mounted at a focus of said reflector,

a power supply unit for power supplying said light source,

a disc element supporting a translucid material for allowing light to pass therethrough,

characterized in that said lighting device further comprises;

a fan to supply air to an inside of said lighting device, so as to allow to remove the heat from said light source, and electric elements for power supplying said fan and an air conveying assembly including a body and tube allowing said air to circulate through a closed loop and allowing said translucid material used for conveying light to an outside environment to be cooled.

2. A lighting device according to claim 1, characterized in that said light source power supply electric unit comprises electric components allowing said light source to be power supplied without using an outer power supply device.

3. A lighting device according to claim 1, characterized in that said fan conveys air heated by said light source and electric components on a rear portion of a lighting element comprising a body made of a good thermal conductivity material thereby allowing a thermal dissipation toward the outside of the lighting device.

4. A lighting device according to claim 1, characterized in that said light source comprises a discharge lamp operated by an operating apparatus built-in in said lighting device.

5. A lighting device according to claim 1, characterized in that said lighting device comprises a body on which is fixed a disc element supporting a translucid material, which is cooled by forced convection by an air flow providing a thermal exchange therewith.

6. A lighting device according to claim 1, characterized in that said lighting device comprises an air return device, in particular an inner tube, concentrically arranged with respect to said body and supporting an optical reflector, said light source and a bush element of said light source arranged at a focus of said reflector, as well as said electric unit for operating said light source and fan.

7. A lighting device according to claim 1, characterized in that the assembling order of said electric unit and said fan can be reversed.

8. A lighting device according to claim 1, characterized in that the air flow direction can be reversed.

9. A lighting device according to claim 1, characterized in that the component elements of said electric unit, in particular the ballast, capacitor, igniter is so designed as to facilitate the air circulation toward said fan.

10. A lighting device according to claim 1, characterized in that said fan generates an air movement inside said tube.

11. A lighting device according to claim 1, characterized in that, after having passed through said tube and being heated in contact with said light source and said electric components, the air flow sucked by said fan passes through said fan and is then caused to impinge on a bottom portion of said body thereby providing a thermal exchange with said body by a forced convection type of thermal exchange.

12. A lighting device according to claim 1, characterized in that in said device the return of air is obtained by causing said air to circulate between said bodies and tube, which operate as air guiding means.

13. A lighting device according to claim 1, characterized in that the mechanical elements supporting said reflector, light source and said electric components have a plurality of ports for allowing air conveyed in the direction of said fan to pass therethrough.

14. A lighting device according to claim 1, characterized in that said lighting device comprises two translucid material layers, said translucid material layers being separated by a spacing element made of an insulating material, thereby providing an insulating gap therebetween.

15. A lighting device according to claim 1, characterized in that said lighting device can be installed both embedded in the ground and at places raised from said ground.