This application claims priority to Italian Patent Application Serial No. 102016000072576, which was filed Jul. 12, 2016, and is incorporated herein by reference in its entirety.
The description relates to lighting devices.
One or more embodiments may refer to lighting devices employing electrically-powered light radiation sources, such as solid-state sources, e.g. LED sources.
One or more embodiments may find application in the implementation of LED modules which are protected against the penetration of foreign agents, e.g. having an IP degree protection.
Lighting devices such as LED modules, e.g. having an elongated (linear) shape and optionally being flexible, may offer a high level of flexibility as regards installation: as a matter of fact, final users may cut, from a continuous reel, strips of desired lengths according to the application and usage needs.
Desirable features in such modules are a protection against foreign agents (e.g. an IP degree protection) and/or mechanical flexibility, in order to meet different installation needs, as well as flexibility in lumen output.
In order to implement protected linear LED modules, the modules may be initially provided without protection, i.e. without sealing, and may subsequently be treated in different ways according to the protection degree to be achieved.
Exemplary possible solutions are the following:
These solutions may be disadvantageous because they may require different layout designs, e.g. when different LEDs are intended to be used and/or different LED pitches must be implemented.
Moreover, such modules may exhibit a satisfactory bendability only in one plane, e.g. perpendicular to the laminar support structure, which may be implemented e.g. as a Flexible Printed Circuit (FPC).
In addition, the ohmic resistance of the electrically conductive lines (e.g. copper lines) used for supplying the driving voltage along the LED module may impose limits on the maximum length of the LED module. These electrically conductive lines may have thicknesses limited to standard values (e.g. 35-50 μm: 1 μm=10−6 m), their width being adapted to be reduced in some points due to design constraints.
Other solutions have also been proposed based on standard flat cables, as normally used in various electrical devices, whereon there may be arranged mounting locations for LEDs and other electronic components via engravings into the insulating material, the electrical connection between the LEDs and the supply cables being achieved by uncovering the copper wires in certain dedicated areas.
In such solutions, an IP degree protection may be obtained by inserting the system into a protective tube, or covering the electronic components with protective materials.
For example, a standard flat cable may be used for the mains voltage supply, and a shrinkable sleeve may act as a protective tube. In other solutions, a standard flat cable may be used for data transmission, while the protection may be achieved through and injection/covering of protective material.
For example, document DE 102013203666 A1 describes a multi-wire flat cable, wherein the locations for LEDs and electronic components are obtained by removing insulating material.
Document U.S. Pat. No. 6,914,194 B2 describes a flat two-wire cable, wherein the locations for LEDs and electronic components are obtained by removing insulating material. The IP protection is achieved by insertion into a transparent sheath.
The main disadvantages of such solutions reside in the implementation complexity as regards manufacturing and costs connected with the production of flat cables, e.g. with CNC machines, as well as in the complexity of the mounting process of the electronic components.
One or more embodiments aim at overcoming the previously outlined drawbacks.
According to one or more embodiments, said object may be achieved thanks to a housing for lighting devices having the features set forth in the claims that follow.
One or more embodiments may also concern a corresponding lighting device, as well as a corresponding method.
The claims are an integral part of the technical teachings provided herein with reference to the embodiments of the present specification.
One or more embodiments envisage the use of profiled elements of polymeric materials (e.g. silicone or other polymers) having a channel-shaped or U-shaped profile, wherein there are integrated flexible cables or flat conductors adapted to distribute an electrical supply and/or other electrical signals (e.g. for driving the light radiation sources).
Along said profiled element it is then possible to arrange, virtually at any position, single light radiation sources, such as Printed Circuit Boards (PCBs) provided with LEDs, e.g. of the type Chip on Board (CoB) or the like.
In one or more embodiments, it is therefore possible to provide a virtually free spacing pitch of the light radiation sources, with different possible implementations as regards e.g. the establishment of the electrical contact with the conductors integrated in the housing.
One or more embodiments may achieve an IP degree protection, e.g. via a sealing or potting mass e.g. of a transparent material.
One or more embodiments may lead to the achievement of one or more of the following advantages:
One or more embodiments will now be described, by way of non-limiting example only, with reference to the annexed Figures, wherein:
It will be appreciated that, for clarity and simplicity of illustration, the various Figures may not be drawn to the same scale.
In the following description, various specific details are given to provide a thorough understanding of various exemplary embodiments of the present specification. 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.
The headings provided herein are for convenience only, and therefore do not interpret the extent of protection or scope of the embodiments.
In this respect, it will be appreciated that one or more implementation features exemplified herein with reference to one of the annexed Figures may be transferred to embodiments shown in different Figures.
In one or more embodiments, housing 10 may be a channel-shaped housing, i.e. a housing of elongated shape (and virtually of indefinite length, and optionally adapted to be cut to length according to the application and usage needs) having a U-shaped cross section.
In one or more embodiments, housing 10 may include electrically insulating, optionally flexible material, such as a silicone polymer.
As better detailed in the following, in one or more embodiments one or more light radiation sources L may be arranged freely along the lengthwise extension of housing 10, virtually at any position.
In one or more embodiments, the light radiation source(s) L may include LED modules, e.g. according to the techniques known as Chip-on-Board (CoB) or Pin-Through-Hole.
In one or more embodiments, housing 10 may be provided, e.g. at the core or central wall thereof, with electrically conductive lines 12 adapted to have e.g. a flattened shape (see for example
In both cases, the electrically conductive lines may either have a solid structure or include stranded wires.
In one or more embodiments, the electrically conductive lines 12 may be integrally embedded into the material of housing 10, or they may be embedded (as exemplified in
In one or more embodiments (and as further detailed in the following) the electrical contact between electrically conductive lines 12 and light radiation sources L may be established according to different solutions (sharp piercing contacts, fork-shaped contacts, electrically conductive glue drops, etc.).
In one or more embodiments, the number of electrically conductive lines 12 may be chosen at will. One or more embodiments, as exemplified in
One or more embodiments may envisage a different number of lines 12, e.g. a higher number such as three lines 12 or more; this may be the case, for instance, if the light radiation sources require a control action (e.g. a dimming function) and/or a feedback function on the temperature reached by the sources in operation.
In one or more embodiments, the structure of the obtained lighting device (adapted to be included e.g. of a so-called flexible or “flex” LED module) may be rounded off with the provision of a potting mass 14 introduced into the cavity of the channel shape of housing 10.
Therefore, one or more embodiments may achieve (e.g. through a chemical adhesion to the polymeric material of profiled housing 10) a protection of device 10 against the penetration of foreign agents, e.g. an IP degree protection.
In one or more embodiments, when the or each light radiation source L is inserted into the channel-shaped housing 10, contacts 180 (which, through electrically conductive lines provided in support 18, are connected to the light radiation source(s) L) may penetrate through the material (e.g. silicone) of housing 10, so as to establish a contact, optionally exerting a piercing action (see
When the or each light radiation source L is inserted into the channel-shaped housing 10, the fork-shaped contacts 182 may penetrate into the material of housing 10 and are adapted, thanks to their fork-like shape, to “surround” the electrically conductive lines (see
One or more embodiments, as exemplified in
Once again it is to be highlighted that, irrespective of the implementation details (e.g. as regards the shape of the cross section) the electrically conductive lines 12 may be implemented either in solid form or as stranded conductors.
Moreover, the electrically conductive masses 120 embedding lines 12 may emerge at the bottom or central wall of channel-shaped housing 10.
In this case, the electrical contact with the light radiation source(s) may be obtained via electrical contact lands 184 provided on board 18, e.g. on the face opposite the face which mounts light radiation source(s) L, with masses of electrically conductive (e.g. adhesive) material 184a located between the lands 184 and the electrically conductive masses 120.
Material 120 and adhesive 184 may contribute to impart the implemented electrical contact with an ohmic resistance higher than the ohmic resistance which may be obtained through e.g. metal contacts. The fact that such a connection originates a certain ohmic resistance (in series) may be considered negligible, because at any rate (e.g. in the case of adhesive layer 184a) it is a thin layer which is sandwiched between conductive materials having a rather large exposed surface.
For example,
The use of a number N>3 of electrically conductive lines 12 leads e.g. to the implementation of a data transmission function to and from the single sources L, e.g. a function of individual selective addressing of each source L.
As exemplified in dashed lines in
This may take place according to different solutions for the various sources L. For example,
Said central rail may on the other hand be electrically connected to another source L: in this way it is possible to selectively activate the various sources L according to the application needs.
Moreover, in one or more embodiments, one and the same channel-shaped housing with a plurality of integrated conductive rails may be used for various supply voltages (e.g. 12 V, 24 V or 48 V) while preserving a satisfactory electrical insulation.
One or more embodiments may therefore concern a housing (e.g. 10) for lighting devices, the housing including an electrically insulating channel-shaped elongated body, with a plurality of electrically conductive lines (e.g. 12) which extend along the length of said channel-shaped body, said electrically conductive lines being embedded in said channel-shaped body.
In one or more embodiments, said electrically conductive lines may extend in the central portion of said channel-shaped body.
In one or more embodiments, said electrically conductive lines may include electrically conductive lines of:
In one or more embodiments, said electrically conductive lines may have:
In one or more embodiments, said electrically conductive lines may have an electrically conductive lining (e.g. 120) emerging at the surface of said electrically insulating channel-shaped body.
In one or more embodiments, a lighting device may include:
In one or more embodiments, said electrical contact formations may include:
One or more embodiments may include at least one sealing mass (e.g. 14) sealingly enclosing said at least one light radiation source module in said housing.
In one or more embodiments, said at least one light radiation source module may include a LED light radiation source.
In one or more embodiments, a method for making a lighting device may include:
Without prejudice to the basic principles, the details and the embodiments may vary, even appreciably, with respect to what has been described herein by way of non-limiting example only, without departing from the extent of protection.
The extent of protection is defined by the annexed claims.
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.
Number | Date | Country | Kind |
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102016000072576 | Jul 2016 | IT | national |