Patent Application
20160010809
The present invention relates to a lighting apparatus, in particular a LED lighting apparatus.
Various lighting apparatuses are known in the ambient lighting field (indoor and outdoor lamps), which however appear to have margins for improvement, in particular in terms of construction simplicity, efficiency and photometric performance.
The apparatuses employing LED light sources especially may have problems related to light beam distribution as well as to effective dissipation of the heat generated by the light sources.
It is thus an object of the present invention to provide a lighting apparatus which is simple to be implemented and is fully effective, having in particular high efficiency, high possibilities of defining the light supplied by the lighting apparatus, and good heat dissipation capabilities.
The present invention thus relates to a lighting apparatus as defined in essential terms in appended claim 1, the additional features of which are disclosed in the dependent claims.
The lighting apparatus of the invention is simple to be implemented and fully effective, since it has in particular high efficiency, high possibilities of defining the light supplied by the apparatus, and good heat dissipation capabilities.
Further features and advantages of the present invention will become apparent from the following description of a non-limitative embodiment thereof, with reference to the accompanying drawings, in which:
In
By way of mere example, the lighting apparatus 1 shown in
The support structure 2 supports the light engine 3 and the reflector 4 in a predetermined mutual position.
The support structure 2 optionally includes joints 5 which allow the relative movement between the light engine 3 and the reflector 4.
In particular, the light engine 3 is connected to an articulated system 6, which allows the rotation of the light engine 3; optionally, reflector 4 is also adjustable with respect to the support structure 2.
The support structure 2 supports the light engine 3 and the reflector 4; the light engine 3 and the reflector 4 extend and are aligned along an axis, A which in this case is also an optical axis of the lighting apparatus 1.
Also with reference to
Body 7 may be shaped in various manners; in the example shown, body 7 has a core 9, for example substantially cylindrical along axis A, provided with an internal mixing chamber 10, where the light source 8 is placed.
Chamber 10 is delimited by a bottom wall 11, which is substantially perpendicular to axis A and on which the light source 8 is mounted, and by a side wall 12, which is for example substantially cylindrical and projects from a peripheral edge of the bottom wall 11 and is arranged about axis A.
The side wall 12 is preferably internally coated (toward chamber 10) with a white paint having a very high reflectance.
The light source 8, which may comprise one or more LEDs fixed onto a LED holder board, is mounted on an inner face of the bottom wall 11, facing chamber 10.
Chamber 10 is closed, at an axial end opposite to the bottom wall 11, by a satin-finished, transparent 14 disc, for example made of PMMA, surrounded by a peripheral end edge 15 (an opaque edge which is not transparent to light, in this case made of the material of body 7) of body 7 and precisely of the side wall 12.
Disc 14 defines an emission exit 16 of the light engine 3; the light engine 3 has a substantially hemispheric emission, exiting from the emission exit 16.
Body 7 is provided with a plurality of through cooling openings 17, 18, which extend so as to be substantially parallel to axis A and are arranged about axis A.
For example, body 7 comprises a first series of openings 17 obtained through the bottom wall 11 and consisting of respective slots angularly spaced apart with respect to one another; and a second series of openings 18 obtained through disc 14 and aligned to respective openings 17.
Core 9 is joined to an eccentric peripheral ring 19 which projects from core 9 and is connected to the supporting structure 2, preferably by means of the articulated system 6. A further cooling opening 20 is defined between core 9 and ring 19.
The light source 8 and the emission exit 16 are aligned along axis A.
Reflector 4 extends along and about axis A and faces the emission exit 16 of the light engine 3 and the light source 8.
In particular, as shown in
In particular, reflector 4 is shaped as a rotation paraboloid, having a parabolic longitudinal section, and the emission exit 16 of the light engine 3 is placed in the focus of the paraboloid.
The emission exit 16 and the exit opening 24 are mutually opposite (i.e. the light emitted by the light source 8 transits through the emission exit 16 and through the exit opening 24 in opposite directions).
Reflector 4 has a front surface 27, facing the light engine 3, and a rear surface 28, opposite to the front surface 27.
The front surface 27 is a concave surface on which spherical caps 29 defining respective optical portions are present.
In particular, the front surface 27 has a pattern of spherical caps 29 projecting toward the light engine 3 and arranged so as to be circumferentially and longitudinally side-by-side on the front surface 27.
The spherical caps 29 are organized in concentric circles about axis A and on rows arranged along respective generatrices of reflector 4.
The rear surface 28 is knurled; in particular, the rear surface 28 is provided with a series of projections 30 shaped to operate in total internal reflection and to reflect, toward the exit opening 24, substantially all (or most of) the emission of the light engine 3 entering body 21 through the front surface 27.
The projections are preferably longitudinally arranged side-by-side and extend along respective generatrices of reflector 4.
Each projection has two sides 31 converging into a vertex, in particular by about 90° (
In use, the light emitted by the light source 8 is mixed and uniformed in chamber 10 and diffused through disc 14; the emission of the light engine 3 exits from the emission exit 16 with a substantially hemispheric distribution and is incident upon the front surface 27 of reflector 4.
The light enters into the reflector body 21 through the front surface 27 and is reflected by the rear surface 28. In each projection 30, the light rays which are incident on each side 31 are internally reflected on the other side 31 and from there go back, through body 21, to the front surface 27.
The spherical caps 29 define the optical light exiting properties. It is understood that optical portions of different geometry could be used instead of the spherical caps.
Since body 21 is made of a transparent material, a light effect is determined, in which body 21 is illuminated instead of simply reflecting the light as in the common reflectors.
The light is concentrated, with part of the light emitted in an indirect mode.
The cooling openings 17, 18, 20 allow the flows of cooling air to circulate through chamber 10 and the light rays reflected by reflector 4 to pass therethrough.
In a variant, the front surface 27 is a reflecting mirror surface, e.g. aluminum coated.
In this case, the light emitted by the light engine 3 does not enter into the body 21 of reflector 4, but is directly reflected by the front surface 27.
A highly controlled lighting is obtained.
In a further variant, the front surface 27 is coated with a white paint having a high reflectance in order to generate a diffused light effect.
Finally, it is understood that further changes and variations can be made to the lighting apparatus described and shown herein, without departing from the scope of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| MI2014A000548 | Mar 2014 | IT | national |
