Lighting device and corresponding method

Abstract

A lighting device may include a channel-shaped elongated profiled body including a light permeable material and having a mouth portion, and a light radiation source assembly arranged at the mouth portion and including a support board having one or more electrically powered light radiation sources, e.g. LED light radiation sources, thereon facing profiled body. Mouth portion of profiled body includes shoulder formations arranged sidewise of said mouth portion, with support board abutting against said shoulder formations.

Claims

1. A lighting device, comprising: a flexible channel-shaped elongated profiled body including a light permeable material, said flexible channel-shaped profiled body having a mouth portion, wherein said light permeable material of said flexible channel-shaped elongated profiled body is recessed at said mouth portion creating a convex surface in said flexible channel-shaped elongated profiled body, the convexity facing towards an inside surface of the flexible channel-shaped elongated profiled body; and a flexible light radiation source assembly arranged at said mouth portion and including a support board having at least one electrically powered light radiation source thereon facing said profiled body, wherein said light radiation source assembly defines a volume with respect to the recessed profile of the mouth portion of said profiled body; and; wherein said profiled body includes two lateral inserts extending lengthwise of said elongated profiled body; wherein said profiled body includes shoulder formations sidewise of said mouth portion with said support board abutting against said shoulder formations.

2. The lighting device of claim 1, wherein said lateral inserts include a light impermeable.

3. The lighting device of claim 2, wherein said lateral inserts have protuberances protruding inwardly of the profiled body to provide said shoulder formations.

4. The lighting device of claim 2, wherein said lateral inserts include distal portions protruding with respect to said mouth portion away from said profiled body to form said shoulder formations.

5. The lighting device of claim 1, wherein said lateral inserts have protuberances protruding inwardly of the profiled body to provide said shoulder formations.

6. The lighting device of claim 1, wherein said lateral inserts include distal portions protruding with respect to said mouth portion away from said profiled body to form said shoulder formations.

7. The lighting device of claim 1, including a filling of a light permeable mounting material between said at least one light radiation source and said light permeable material recessed at said mouth portion.

8. The lighting device of claim 1, wherein said light permeable material of said profiled body is of a light diffusive type.

9. The lighting device of claim 1, wherein said at least one light radiation source is a LED source.

10. A method of producing a lighting device, comprising: providing a flexible channel-shaped elongated profiled body including a light permeable material, said channel-shaped profiled body having a mouth portion, recessing the light permeable material of said profile body at the mouth portion creating a convex surface, the convexity facing towards an inside surface of the flexible channel-shaped profiled body; arranging at said mouth portion a flexible light radiation source assembly including a support board having at least one electrically powered light radiation source thereon facing said profile body, defining a volume with respect to the recessed profile of the mouth portion of said profiled body using the flexible light radiation source assembly; extending two lateral inserts lengthwise along the elongated profiled body; providing said profiled body with shoulder formations sidewise of said mouth portion, and bringing said support board to abut against said shoulder formations.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the drawings, like reference characters generally refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention. In the following description, various embodiments of the invention are described with reference to the following drawings, in which:

(2) FIG. 1 is a cross-section view of a lighting device according to various embodiments,

(3) FIGS. 2 to 4 show possible implementing variations of the device of FIG. 1, and

(4) FIG. 5 shows a further possible implementing variation of one of the elements constituting a device, as exemplified in FIGS. 1 to 4.

DETAILED DESCRIPTION

(5) In the following description, numerous specific details are given to provide a thorough understanding of one or more exemplary embodiments. The embodiments may be practiced without one or several specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the embodiments. Reference throughout this specification to one embodiment or an embodiment means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the possible appearances of the phrases in one embodiment or in an embodiment in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments, and/or may be associated to the embodiments in a different way from what is shown herein, so that e.g. a feature herein exemplified in connection to a Figure may be applied to one or more embodiments exemplified in a different Figure.

(6) The headings provided herein are for convenience only, and therefore do not interpret the scope or meaning of the embodiments.

(7) In the Figures, reference 10 denotes a lighting device adapted to be implemented, in one or more embodiments, as an elongated module (e.g. a bar or a strip) which may be flexible and/or adapted to be cut to length according to the application and use requirements.

(8) As far as the present description is concerned, device 10 may therefore be considered as an element of indefinite length shown in the views of FIGS. 1 to 4 (and, as regards one of the components, FIG. 5) in cross section to the main extending direction.

(9) In one or more embodiments, device 10 may include an elongated profiled body 12 adapted to have a mouth portion 12a comprised between two lateral sides, which may be defined by two inserts 120 extending lengthwise of body 12 along the channel-shaped sides.

(10) In various embodiments, the central part of body 12 and the inserts 120 may be produced in a single co-extrusion step.

(11) In various embodiments, body 12 may include a light permeable, i.e. transparent, material, the lateral inserts 120 made of a light impermeable, e.g. opaque and optionally white material.

(12) In various embodiments, both body 12 and lateral inserts 120 may be made of a polymer material (e.g. silicone), the opaqueness of inserts 120 being given by the presence of a filling material such as alumina (Al.sub.2O.sub.3). Such a filling material may optionally and additionally be embedded in the portion of body 12 which is permeable to light (in a lower percentage than the amount of filling adapted to make inserts 120 opaque) so as to impart body 12 features of diffusiveness towards light radiation.

(13) In various embodiments, mouth portion 12a of profile 12 may house, possibly with the interposition of a layer of a light permeable polymer material 14, a light radiation source assembly (light engine) 16.

(14) In various embodiments, assembly 16 may include:

(15) a support board 16a, which can substantially be considered as a Printed circuit Board (PCB), and one or more electrically powered light radiation sources 16b, arranged on the side of support board 16a facing profiled body 12.

(16) In various embodiments, sources 16b may be solid state light radiation sources, such as LED light radiation sources.

(17) In various embodiments, both the body 12 (including the lateral inserts 120) and the light radiation source assembly 16 may be made flexible, for example in an up/down direction with respect to the viewpoint of the Figures.

(18) In use, the light radiation emitted by source(s) 16b is directed towards the body 12 of light permeable material (which may have light diffusiveness features) so as to be emitted by device 10 at the face of profile 12 opposed to mouth portion 12a.

(19) Lateral inserts 120, moreover, thanks to their opaqueness (impermeability to light radiation) and optional white colour, cooperate in directing the light radiation emitted by light radiation source assembly 16 towards said output face.

(20) Thanks to the possible diffusiveness of the material included, body 12 is adapted to perform a homogenization action on the light radiation passing through it, so as to make the position of light radiation sources 16b less perceivable also at short distance.

(21) In various embodiments, as exemplified in FIGS. 1 to 4, lateral inserts 120 may have protuberances 120a which extend (in a continuous or discontinuous way along the lengthwise contour of device 10) towards the inside of profiled body 12, so as to form shoulders against which the support board 16a of the light radiation source assembly 16 is adapted to abut.

(22) In various embodiments, the profile of body 12 may be shaped (see for example FIG. 5, but the same shape may be adopted in the embodiments exemplified in FIGS. 1 to 4 as well) so as to be recessed at the mouth portion 12a. In this way, irrespective of the presence of material 14 in the recessed part, a convex surface can be created (the convexity facing towards the inside of body 12) through which the light radiation emitted by source(s) 16b flows inside body 12.

(23) The shoulders formed by protuberances 120a on both sides of mouth portion 12a are adapted to act as a mechanical reference for mounting light radiation source assembly 16, with support board 16a abutting against such shoulders irrespective of the size of light radiation source(s) 16b.

(24) As a consequence, while being able to influence the amount of mounting (lamination) material 14 which may be arranged in the above mentioned recessed part, the use of different light radiation sources (and/or components such as associated drivers), which involves a change in the volume defined with respect to the recessed profile of mouth portion 12a, does not affect the position of board 16a.

(25) Said position, actually, is defined by the board sides, which abut against protuberances 120a.

(26) Moreover, the possibility is given to avoid air bubbles or the application of an excessive amount of material 14.

(27) FIGS. 2 to 4 exemplify what previously stated referring to light radiation sources 16b which are intentionally shown as having different shapes and/or sizes.

(28) FIGS. 1 to 4 highlight the fact that in the various embodiments exemplified herein the light radiation produced by assembly 16 always covers the same kind of path (source 16bmaterial 14 (if present)light permeable portion permeable of body 12) without having to propagate through an air gap of a relevant thickness.

(29) Various embodiments enable to maintain the thickness of support board 16b constant, with the consequent possibility to keep the same kind of electrical connectors (not visible in the Figures).

(30) It will moreover be appreciated that the optional absence of lamination material above light radiation sources 16b makes the devices less sensitive to a possible variation of performances, in the case of a change of the type of light radiation source 16b. Actually, it is possible to minimize Fresnel optical losses by reducing the angle of incidence of light rays from light radiation sources 16b, as can be seen in FIGS. 2 to 4.

(31) FIG. 5 exemplifies the possibility to implement the abutment shoulders for board 16b by providing lateral inserts 120 having distal portions protruding with respect to mouth portion 12a of the profiled body. This generates, on either side of the recessed portion of mouth 12a, two horns 120b, which again are adapted to form lateral shoulders having abutment surfaces for support board 16a.

(32) Various embodiments as exemplified in FIG. 5 are adapted to further simplify the extrusion process of profiled body 12.

(33) While the disclosed embodiments have been particularly shown and described with reference to specific embodiments, it should be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the disclosed embodiments as defined by the appended claims. The scope of the disclosed embodiments is thus indicated by the appended claims and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced.