Patent Application
20130033868
The present invention relates to the field of lighting devices that use light sources of the point source type, in particular it relates to the field of lighting devices that use LED (Light Emitting Diodes) and devices for the disposal of heat generated during the operation of the said LED.
The devices and the lighting equipment used today make an ever increasing use of LED (Light Emitting Diodes) by virtue of their ease of use and higher characteristics in terms of average life expectancy, flexibility of use and integration possibilities in small spaces, with respect to conventional light sources consisting of incandescent and fluorescent lamps.
Notwithstanding the technology concerning the LED light sources is characterised by constant development, such as to further improve the characteristics thereof and thus bring closer the final override of the LED with respect to all other light sources, one of the aspects that, up to date, is considered more problematic regards the thermal power dissipation of these devices and the need for effective disposal systems and thermal dissipation that follows thereof.
The current LED, in fact, emit under the shape of visible light radiation only 20 to 30% of the absorbed power and dissipate by conduction, convection and radiation the remaining 70 to 80%. This leads to the obvious need to equip the LED devices used for lighting, with adequate dissipation means that ensure the correct dissipation of heat generated in a manner to ensure the correct operation of the same LED device and of the surrounding circuitry.
In most cases, the most used method for this purpose involves the use of metal heat sinks, sized ad hoc, to be placed in contact with the LED device such as to dispose the thermal power thereof and to maintain the working temperature within such limits not to jeopardize the correct operation and not to lower the average life expectancy thereof. This solution, however, is limited by the thermal resistance of the heat sink under natural convection conditions. To obtain lower thermal resistances, and hence a more effective thermal dissipation, it becomes necessary to resort to the use of fans and conveyors which, however, are bulky and difficult to handle and cannot be used for all those lighting devices wherein the available sizes are often insufficient to house heat sink, fan and conveyor and for those devices wherein the optical assembly, comprising the LED and the related heat sinks, can assume different positions and inclinations with respect to the body of the lighting device.
Therefore, a first objective of the present invention, represents the introduction of a dissipation module for LED lighting systems adapted to be associated, in particular, to built-in LED lighting devices type; represents a further objective of the present invention, a built-in LED lighting device, comprising an optical assembly adapted to assume different positions and inclinations with respect to the body of said lighting device and a thermal dissipation module comprising a fan, a conveyor associated to said fan and a heat sink integral with the optical assembly of said lighting device.
The present invention relates to a built-in LED lighting device, comprising an optical assembly, adapted to assume different positions and inclinations with respect to the body of said lighting device, and a thermal dissipation module, comprising in turn a fan, a conveyor associated to said fan and a heat sink integral with the optical assembly of said lighting device.
With reference to the attached
In a preferred embodiment of the built-in LED lighting device according to the present invention, said conveyor 15 is integral with said frame 13 and said heat sink 14 is made with an asymmetric shape and section, and such as to maximise the surface of the lugs and allow the reciprocal movement and positioning of said optical assembly 10 with respect to said frame 13, both inside—as illustrated in attached FIG. 2—and outside thereof, as illustrated in attached
In a further preferred embodiment of the built-in LED lighting device according to the present invention, said conveyor 15 is provided with suitable fixing means to said frame 13 adapted to allow to said conveyor 15 to be inclined with respect to said frame 13, such as to ensure a further degree of freedom in case wherein the space available for the recess is of particularly small sizes.
In a further preferred embodiment of the present invention, said conveyor 15 is made of a cylindrical body, preferably of plastic material, comprising, on the bottom, suitable fixing means to said frame 13 and, at the other end, suitable fixing means for a fan.
The device according to the present invention can be made in various sizes and wattages, and finds advantageous use in all built-in applications, even in those wherein the space available inside the false ceiling is very small.
| Number | Date | Country | Kind |
|---|---|---|---|
| FI2011A000161 | Aug 2011 | IT | national |
