Lighting apparatus and assembly kit for a lighting apparatus

Abstract

A lighting apparatus (1) comprises a support element (22), for fixing to a dissipative body (21) for dispersing heat, and electrical contacts (251) on the support element (22). A light module (3) comprises a base (32) fixed to the support element (22) and a light source (31) joined to the base (32). An optic (4), such as a lens or reflector, is fixed to the light module (3) to direct a beam of light. The base (32) of the light module (3) is made of material with high dissipative power. A plurality of first connectors (34) fixed to the base (32) each comprise a conductor element (341) and an insulating element (342) that electrically insulates the conductor element (341) from the base (32). The conductor element (341) connects a contact (251) on the support element (22) and a contact (311) of the light source (31).

Description

Technical field

[0001] The present invention is developed in the technical field of lighting. In particular, the invention relates to a lighting apparatus and a kit of components for the assembly thereof in accordance with the preamble of claim 1.State of the art

[0002] Lighting apparatuses in which a light source, for example LED, is mounted posteriorly to an optical structure are known in the art. The light source during operation heats up, and is therefore usually mounted on a structure for heat dissipation.

[0003] US 8668363 discloses an example of such an LED spotlight. In order to efficiently dissipate heat, the base of the LED is pressed into surface contact against a heat-conducting element, in turn placed on the dissipative structure. For this purpose, a compressive force is applied in the axial direction on the electrical contacts of the LED, which protrude radially from an electrically insulating casing of the base on which the LED is mounted.

[0004] US 8668363 suggests that the socket contacts for the power supply press the LED contacts in a radial direction, and not an axial direction, in such a way that they do not oppose the compressive force that must maintain the thermal contact.Summary of the invention

[0005] An object of the present invention is to make the electrical connection between the various elements more efficient as well as to make the heat exchange between the light source and the heat dissipation structure more efficient.

[0006] This and other objects are achieved by a lighting apparatus and its assembly kit according to any one of the appended claims.

[0007] The claimed lighting apparatus provides that the base on which the light source is mounted is made of material with high dissipative power, for example aluminium, but also other metals or non-metallic dissipative materials known to those skilled in the art. This significantly favours the passage of heat from the light source to the underlying support element, which is if necessary fixable to a dissipative body where the power of the light source requires it. At the same time, to ensure a correct supply of the light source despite the metal support, a plurality of first connectors are provided, removably fixed to the base, each of which comprises an insulating element that electrically insulates from the base.

[0008] Preferably, each first connector has a conductor element with a first leg extending from a front surface to a rear surface of the base of the light source to allow electrical contact on the support element and a second leg extending from the first leg to an electrical contact of the light source.

[0009] In an advantageous embodiment, the base for the light source is fixed to the support element by means of rotation locking elements, for example bayonet ones with wedge surfaces, or with a thread for a complete or partial rotation depending on the solution adopted.

[0010] These allow to maintain a good surface contact for the heat exchange, without the need to provide for the precautions adopted in US 8668363 to press the electrical contacts and the first connectors together in a radial direction. This allows to avoid radial forces and protruding contacts, and therefore to simplify the structure with respect to US 8668363 and to avoid stressing the electrical contacts.

[0011] In different embodiments the light source may be positioned directly in a pitch of the base, or an adaptation frame may adapt the dimensions of the light source to the pitch. Different frames may be provided for different types of light source.

[0012] Further features and advantages of the invention will be recognisable by a person skilled in the art from the following detailed description of exemplary embodiments of the invention.Brief Description of the figures

[0013] For a better understanding of the following detailed description, some embodiments of the invention are illustrated in the accompanying drawings, wherein: figure 1 shows a perspective view of a lighting apparatus according to an embodiment of the invention, mounted on a dissipative body, figure 2 shows a perspective view of the light module, without any additional dissipative body, figure 3 shows an exploded perspective view of the light module from below, Figure 4 shows an exploded perspective view from above of the light module and a generic dissipative body, figure 5 shows an exploded top perspective view of the light module, in an embodiment in which no adaptation frames are required, and figure 6 shows an exploded top perspective view of a support element with first connectors of the light module of figure 3, figure 7 shows a perspective view (first line) and a top view (second line) of the first conductor of the lighting apparatus in different orientations, figure 8 shows a perspective view from above in an exploded view of some elements of the lighting apparatus in accordance with an alternative embodiment, figure 9 shows a perspective view from below in an exploded view of some elements of the lighting apparatus of figure 8, figure 10 shows an exploded perspective view from above of the lighting apparatus of figure 8 and 9. DETAILED DESCRIPTION

[0014] A lighting apparatus, indicated in the figures with reference number 1, comprises: a supporting frame 22, an optical assembly 4 and a light module 3 arranged between the support element 22 and the optical assembly 4.

[0015] These assemblies and elements 22, 3 and 4 may be composed of various components, as described below.

[0016] The light module 3 is dedicated to the generation of light, and for this purpose comprises a light source 31, preferably one or more LEDs, configured to emit light when electrically powered.

[0017] The optical assembly 4 is dedicated to collecting the light generated by the light source 31 to obtain a beam with the desired properties, for example in terms of direction, amplitude and focus.

[0018] The optical assembly 4 can be made in various ways known to those skilled in the art. For example, the optical assembly 4 may include a lens and / or a reflector.

[0019] In the illustrated embodiment, an example of an optical assembly 4 is shown with a mounting body 41 having a central recess 411, open on the side opposite to the light module 3. Optionally, a lens 42 is mounted to the mounting body 41, and is positioned between the light source 31 and the recess 411 of the mounting body 41.

[0020] The support element 22 is generally dedicated to fixing the light source 3 and the optical assembly 4 to other bodies. In particular, the support element 22 is dedicated to the connection with a dissipative body 21, so as to form with it a single dissipative structure 2.

[0021] The dissipative body 21 is dedicated to avoiding overheating of the light source 31 by dispersing the excess heat it generates into the environment, preferably by natural ventilation.

[0022] In some embodiments, a dissipative body 21 is included in the light apparatus 1 of the invention. In other embodiments, the light apparatus 1 is provided without a dissipative body 21, and may be fixed thereto at a later time.

[0023] The dissipative body 21 is preferably provided with a plurality of aeration fins 211. The fins 211, preferably, protrude from a rear surface, but in other embodiments they can be positioned for example at a side surface.

[0024] The support element 22 is suitable for positioning on the dissipative body 21, in particular on a front surface of the dissipative body 21.

[0025] The support element 22 is arranged for fixing the light module 3 to the dissipative body 21, as described in more detail below.

[0026] In the illustrated embodiment, the dissipative body 21 and the support element 22 are formed in two distinct bodies, which can be fixed to each other. These parts are in surface contact with each other to maximize heat exchange, and are removably fixed to each other. For this purpose, one or more fixing holes 23 formed in both the dissipative body 21 and the support element 22 may be provided, and one or more first fixing elements 24, for example screws, configured to simultaneously engage respective fixing holes 23 of the dissipative body 21 and the support element 22.

[0027] A person skilled in the art will however be able to fix the dissipative body 21 and the support element 22 also in alternative ways.

[0028] An element capable of more effectively transferring the heat produced by the light source 31, such as for example a conductive thermal paste, graphite or other, can be interposed between the dissipative body 21 and the support element 22.

[0029] Furthermore, embodiments may also be provided in which the dissipative body 21 and the support element 22 are formed in one piece.

[0030] The light module 3 comprises a base 32, having a front surface 321 and an opposite rear surface 322 spaced apart in the axial direction X-X.

[0031] The rear surface 322 is in surface contact with the support element 22 or directly to the dissipative body 21 if the support element 22 is incorporated therein.

[0032] The light source 31 is instead removably fixed to the front surface 321 of the base 32. Preferably, for this purpose, the base 32 has a pitch 323 for fixing the light source 31.

[0033] The pitch 323 is located at the front surface 32 and can be identified, for example, by a recess in the front surface 321.

[0034] Optionally, the light module 3 comprises an adaptation frame 33 (figure 4), configured to adapt the light source 31 to be fixed to the front surface 321 of the base 32.

[0035] In particular, the frame 33 may have an outer perimeter with any shape and size corresponding to the pitch 323, and an opening having an inner perimeter with shape and size corresponding to the light source 31.

[0036] Thanks to this arrangement, the same base 32 can accommodate lighting devices 31 with different shapes and / or sizes.

[0037] For example, two substantially square-shaped light sources 31 with different dimensions are illustrated in the figures, and the pitch 323 is also square-shaped.

[0038] One of the light sources 31 has dimensions such as to be fixable directly in the pitch 323 without any frame 33, while the other needs a frame 33.

[0039] It should be noted that by varying the shape of the inner and outer perimeter of the frame 33, frames 33 can also be obtained for light sources 31 and / or pitches 323 with different shapes, for example circular, star-shaped, rectangular.

[0040] One aspect of the invention relates to a assembly kit 1 for the lighting apparatus in which one or more adaptation frames 33 may be included, for respective light sources 31. Such a kit may also include various of the main components of the lighting apparatus 1 to be assembled, including the support element 22, the optical assembly 4, the base 32 of the light module 3, and other parts mentioned below, such as the first connectors, while the light source 31 may be included in the kit or supplied separately.

[0041] According to a preferred aspect of the invention, the base 32 is made of high-dissipative material, for example aluminium / beryllium copper / phosphor bronze. This maximizes the transfer of heat from the light source 31 to the support element 22 and therefore to the possible dissipative body 21, but at the same time requires the arrangements described below to correctly feed the light source 31.

[0042] A plurality of first electrical contacts 251 from which the power is supplied are distributed on the support element 22. The light source 31 in turn comprises a plurality of second electrical contacts 311, isolated from the base 32.

[0043] Furthermore, the light source 31 comprises an lighting element 312, connected to the second electrical contacts 311 and configured to emit light when electrically powered through the second electrical contacts 311.

[0044] In the preferred embodiment, the light source 31 is realized as a printed circuit with an insulating board 313 on which the second electrical contacts 311, the lighting element 312 and conductive tracks connecting them to each other are positioned. In particular, the light source 31 can be a cob (chip on board) LED, in which one or more lighting elements are identified by LED chips on the insulating board 313 or alternatively a printed circuit board (PCB) of any type.

[0045] Preferably, the second electrical contacts 311 are arranged around the lighting element 312. For example, in the presence of two second contacts 311 these can be arranged on opposite sides with respect to the lighting element 312.

[0046] At least two second contacts 311 are generally required for the power supply of the light source 31. However, three or more second contacts 311 may also be provided, for example four contacts as illustrated in the figures. Adding more second contacts 311 may allow controlling the mode of operation of the light source 31.

[0047] For example, in an embodiment the lighting element 312 may comprise several lighting portions, preferably configured to emit light with different colour temperatures (function known as tunable white). Each lighting portion may be supplied by a distinct pair of second contacts 311. Thus, selectively powering of different pairs of second contacts 311 may result in monochromatic lights of different colour temperatures. Further, the intensity of light emitted for each colour may be variable as a function of a supply current received from the relative pair of second contacts 311.

[0048] In an alternative embodiment, a pair of second contacts 311 may serve the purpose of feeding, and at least one further second contact 311 may be a measuring contact, in particular for measuring a temperature of the lighting element 312. Advantageously, this allows the thermal state of the lighting element 312 to be monitored and controlled.

[0049] In another embodiment, the power supply of all the lighting portions comes from a single pair of second contacts 311 for the supply, and in addition one or more second contacts 311 of the type of control signal for the variation of light intensity (e.g. DALI, PWM, analogue) are provided.

[0050] To connect the first and the second electrical contacts 311, 251, the base 32 has a plurality of connector seats 324 and the light module 3 comprises a plurality of first connectors 34 removably fixed to the base 32 at the seats 324. It should be noted that the first electrical contacts 251 and the first connectors 34 can be in the same number of the second electrical contacts 311, or in certain embodiments even in a higher number, so that the base 32 and the support element 22 are compatible with light sources 31 with different numbers of second contacts 311.

[0051] In the preferred embodiment, the connector seats 324 are circumferentially disposed about the pitch 323. Further, each connector seat 324 extends from the front surface 321 to the rear surface 322 of the base 32, so that the respective first connector 324 reaches a second contact 251 on the support element 22. For example, each seat 324 may have a through hole extending through the base 32.

[0052] In the illustrated embodiment, each seat 324 also comprises a groove that connects the through hole to the pitch 323.

[0053] In other non-illustrated embodiments, each seat 324 may locate a recess on a side surface of the base 324, rather than a through hole.

[0054] Each first connector 34 comprises a conductor element 341 and an insulating element 342 fixed to the conductor element 341. The conductor element 34 places into contact a respective first electrical contact 251 of support element 22 and a respective second electrical contact 311 of light source 31.

[0055] As can be seen in figure 7, it should be noted that, advantageously, the insulating element 342 fixed to the conductor element 342 allows greater freedom in rotation of the entire first conductor 34, allowing an electrical connection with the second electrical contacts 311 of the light source 31 without the latter being positioned at necessarily fixed points. In fact, the light sources 31 can be made in configurations or types that can vary depending on a particular model or manufacturer. Such configurations may involve making second electrical contacts 311 at different points or areas of the light source depending on the aforementioned model or manufacturer.

[0056] On the contrary, in the case that the insulating element 342 is separated from the conductor element 341, a different orientation of the conductor element 341 could not guarantee the safety of electrical insulation required for the correct operation of the lighting apparatus 1. Therefore, in accordance with the present invention, the first conductor 34 comprising both the conductor element 341 and the insulating element 342 ensures, with respect to known lighting apparatuses, greater compatibility of the lighting apparatus 1 with different models of light sources 31, thus comprising the second electrical connections 311 possibly made in different areas depending on their type or configuration.

[0057] In the preferred embodiment, the conductor element 341 of each first connector 34 has a first leg 343 and a second leg 344.

[0058] The first leg 343 extends in the axial direction X-X along the entire thickness of the base 32, from the rear surface 322 to the front surface 321. In particular, the first leg 343 extends through the bore of a respective connector seat 324.

[0059] The second leg 344 is joined to the first leg 343 at a fold line. The second leg 344 extends on the front surface 321 of the base 32, transversely to the axial direction X-X, from the first leg 343 to a respective second electrical contact 311 of the light source 31.

[0060] In particular, the second leg 344 may extend all or in part into the connector seat groove 324. Thanks to this type of first connector 34, a connection can be made between the first and second contacts 311, 251 that is simpler and more reliable than in the case of electrical cables. In other embodiments, however, depending on the chosen light source 31, electrical cables may be used.

[0061] Preferably, at least a portion of the second leg 344 is oriented radially towards the central axis of the lighting apparatus 1. Advantageously, this radial section guarantees an electrical connection with a respective second contact 311 of the light source 31, which is sufficiently stable for different embodiments of the light source 31 that may have the second contacts 311 in more central or more peripheral positions. In the illustrated embodiment, for reasons of geometric optimization, the second leg 344 is in turn composed of two transverse sections.

[0062] The insulating element 342 electrically isolates the conductor element 341 from the base 32.

[0063] Preferably, the insulating element 342 is removably insertable into the connector seat 324, and is shaped to retain the conductor element 341. In particular, the insulating element 342 may have an insulating channel, suitable for receiving the first leg 343 and insertable in the hole of the seat 324.

[0064] Preferably, the insulating element 342 is shaped to form with the base 32 an anti-rotation interlock, which prevents unstable electrical contacts. For this purpose, the insulating element 342 may comprise an insulating shelf, which protrudes from the insulating channel in the groove of the seat 324 and is shaped to support at least in part the second leg 344.

[0065] Preferably, an end portion of the second leg 344 extends above the light source 31, up to a second electrical contact 311. Therefore, the insulating board 313 is at least partly interposed in the axial direction X-X between the front surface 321 of the base 32 and the second leg 344 of the conductor element 341.

[0066] The base 32 of the light module 3 is removably fixed to the support element 22. In an advantageous embodiment, the support element 22 and the base 32 comprise respective locking elements 221, 325, configured to make a rotation lock between the support element 22 and the base 32.

[0067] The rotation lock is intended as a lock that involves a relative rotation, for a predetermined locking angle, where present, between the support element 22 and the base 32. This rotation takes place in a circumferential direction, i.e. around a central axis that extends axially.

[0068] In an embodiment, the rotation lock is a bayonet lock, preferably with wedge surfaces. In an alternative, the lock may be a lock by one or more pairs of at least partially threaded portions.

[0069] Still preferably, the locking elements 221, 325 are configured to realize a lock with a movement between the support element 22 and the base 32 which is a simultaneous movement of rotation around the central axis and of translation in axial direction X-X. In this way, in the limit position of the lock, loosening and loss of heat exchange is avoided.

[0070] In one bayonet embodiment, each locking element 325 of the base 32 is hook-shaped, with an axial portion extending toward the support element 22, and a radial portion extending toward the central axis. Preferably, the radial portion has a wedge-shaped surface, i.e. a surface inclined helically with respect to the axial direction.

[0071] Furthermore, each locking element 221 of the support element 22 has a channel shaped to slidably receive the radial portion of the hook identified by the locking element 325 of the base 32. This channel has an axial portion, shaped to guide the locking element 325 of the base 32 towards and away from the support element 22. The channel then has a circumferential portion, shaped to guide the locking element 325 of the base 32 in rotation around the central axis for the locking angle.

[0072] Preferably, the circumferential portion of the channel has a wedge surface, i.e. a surface inclined helically with respect to the axial direction, complementary to the radial portion of the locking element 325 of the base 32. These wedge portions, together, make the contact between the base 32 and the support element 22 more stable.

[0073] In addition, each locking element 221 of the support element 22 has a socket shaped to retain in the axial direction X-X the radial portion of the hook identified by the locking element 325 of the base 32, when the radial portion is in the circumferential portion of the channel.

[0074] This allows the light module 3 and the support element 22 to be easily separated. Advantageously, in the event of a failure of the light source 31, it can be replaced without incurring additional costs for a new support element 22, with its components, and for the possible dissipative body 21. In addition, the light module 3 and the support element 22 are kept well fixed, to the advantage of the stability of the electrical connection, without the need for radial pressures.

[0075] For simple electrical contact, the first contacts 251 on the support element 22 are axially aligned with the connector seats 324. In consideration of the rotation determined by the rotation locking elements 221, 325, preferably each first electrical contact 251 has an exposed conductive surface extending in circumferential direction to an extent at least equal to the locking angle. Advantageously, this prevents electrical disconnections in the event of accidental rotations during use.

[0076] In the preferred embodiment, each first contact 251 is integrated in a respective second connector 25. The second connector 25 comprises a conductive element having a head portion, which identifies the first electrical contact 251, and a connection portion 252. In the illustrated embodiment, the connection portion 252 is identified by a cable, but embodiments with rigid or flexible connection portions 252 are also contemplated.

[0077] Furthermore, the second connector 25 comprises an insulating element that electrically separates the conductive element from the support element 22 and from the dissipative body 21. Preferably, the insulating element comprises a support 253 on which the first contact 251 is positioned. In particular, in the example, the first contact 251 and the support 253 identify a circuit board. Furthermore, the insulating element comprises a sheath 254 covering the connection portion 252.

[0078] The support element 22 has contact seats 222 for receiving the second connector 25. Preferably, each contact seat 222 has a through hole for the passage of the connection portion 252 and the sheath 254. Through holes 212 for passage of the connection portion 252 and the sheath 254 may also be provided in the dissipative body 21. This allows the connection portions 252 to emerge for example from the rear surface of the dissipative body 21 for connection to an external power supply.

[0079] Alternatively, the second connectors 25 may not emerge from the dissipative body 21, but merely reach further electrical contacts on the dissipative body 21, connectable to external electrical power supplies in various ways known to those skilled in the art.

[0080] For the purpose of fixing the optical assembly 4, preferably the light module 3 comprises a cover 35. Preferably, the cover 35 is made of electrically insulating material, but in the case of light sources 31 with high powers, conductive covers 35 can also be provided.

[0081] The cover 35 is removably fixed between the optical assembly 4 and the base 32 of the light module 3. To assemble the cover 35 to the base 32, one or more fixing holes 351, 326 formed in both the cover 35 and the base 32 may be provided, and one or more second fixing elements 36, e.g. screws, configured to simultaneously engage respective fixing holes 351, 326 of the cover 35 and the base 32.

[0082] Advantageously, the cover 35 presses the first connectors 34 against the base 3, ensuring good electrical contact with the second contacts 311 of the light source 31.

[0083] The cover 35 has a central opening 352 arranged between the light source 31 and the mounting body 41 of the optical assembly 4, for the passage of light towards the recess 411 of the mounting body 41.

[0084] For fixing the optical assembly 4 to the cover 35, preferably the mounting body 41 of the optical assembly 4 and the cover 35 comprise rotation locking elements 412, 353, which may be analogous to those already described for the base 32 and the support element 22. Advantageously, the optical assembly 4 can also be easily removed from the light module 3, and possibly replaced individually. The cover 35 fits different commercial and custom reflectors, lenses and hybrid optics.

[0085] In an alternative embodiment shown in figures 8-10, the locking elements 325 are not made at the base 32, but at the cover 35. That is, the support element 22 and the cover 35 comprise the aforementioned respective locking elements 221, 325. As the base 32 is interposed between the cover 35 and the support element 221, the base 32 itself is preferably shaped so as to allow a relative coupling between the locking elements 221, 325. For example, the base 32 may have slots to allow passage of the locking elements 325 to reach the locking elements 221.

[0086] It is clear that a person skilled in the art will be able to make numerous equivalent modifications to the variants set forth above, without thereby departing from the scope of protection as defined by the appended claims.

Examples

Embodiment Construction

[0014]A lighting apparatus, indicated in the figures with reference number 1, comprises:

a supporting frame 22, an optical assembly 4 and a light module 3 arranged between the support element 22 and the optical assembly 4.

[0015]These assemblies and elements 22, 3 and 4 may be composed of various components, as described below.

[0016]The light module 3 is dedicated to the generation of light, and for this purpose comprises a light source 31, preferably one or more LEDs, configured to emit light when electrically powered.

[0017]The optical assembly 4 is dedicated to collecting the light generated by the light source 31 to obtain a beam with the desired properties, for example in terms of direction, amplitude and focus.

[0018]The optical assembly 4 can be made in various ways known to those skilled in the art. For example, the optical assembly 4 may include a lens and / or a reflector.

[0019]In the illustrated embodiment, an example of an optical assembly 4 is shown with a mounting body 41 ...

Technical field

[0001] The present invention is developed in the technical field of lighting. In particular, the invention relates to a lighting apparatus and a kit of components for the assembly thereof in accordance with the preamble of claim 1.State of the art

[0002] Lighting apparatuses in which a light source, for example LED, is mounted posteriorly to an optical structure are known in the art. The light source during operation heats up, and is therefore usually mounted on a structure for heat dissipation.

[0003] US 8668363 discloses an example of such an LED spotlight. In order to efficiently dissipate heat, the base of the LED is pressed into surface contact against a heat-conducting element, in turn placed on the dissipative structure. For this purpose, a compressive force is applied in the axial direction on the electrical contacts of the LED, which protrude radially from an electrically insulating casing of the base on which the LED is mounted.

[0004] US 8668363 suggests that the socket contacts for the power supply press the LED contacts in a radial direction, and not an axial direction, in such a way that they do not oppose the compressive force that must maintain the thermal contact.Summary of the invention

[0005] An object of the present invention is to make the electrical connection between the various elements more efficient as well as to make the heat exchange between the light source and the heat dissipation structure more efficient.

[0006] This and other objects are achieved by a lighting apparatus and its assembly kit according to any one of the appended claims.

[0007] The claimed lighting apparatus provides that the base on which the light source is mounted is made of material with high dissipative power, for example aluminium, but also other metals or non-metallic dissipative materials known to those skilled in the art. This significantly favours the passage of heat from the light source to the underlying support element, which is if necessary fixable to a dissipative body where the power of the light source requires it. At the same time, to ensure a correct supply of the light source despite the metal support, a plurality of first connectors are provided, removably fixed to the base, each of which comprises an insulating element that electrically insulates from the base.

[0008] Preferably, each first connector has a conductor element with a first leg extending from a front surface to a rear surface of the base of the light source to allow electrical contact on the support element and a second leg extending from the first leg to an electrical contact of the light source.

[0009] In an advantageous embodiment, the base for the light source is fixed to the support element by means of rotation locking elements, for example bayonet ones with wedge surfaces, or with a thread for a complete or partial rotation depending on the solution adopted.

[0010] These allow to maintain a good surface contact for the heat exchange, without the need to provide for the precautions adopted in US 8668363 to press the electrical contacts and the first connectors together in a radial direction. This allows to avoid radial forces and protruding contacts, and therefore to simplify the structure with respect to US 8668363 and to avoid stressing the electrical contacts.

[0011] In different embodiments the light source may be positioned directly in a pitch of the base, or an adaptation frame may adapt the dimensions of the light source to the pitch. Different frames may be provided for different types of light source.

[0012] Further features and advantages of the invention will be recognisable by a person skilled in the art from the following detailed description of exemplary embodiments of the invention.Brief Description of the figures

[0013] For a better understanding of the following detailed description, some embodiments of the invention are illustrated in the accompanying drawings, wherein: figure 1 shows a perspective view of a lighting apparatus according to an embodiment of the invention, mounted on a dissipative body, figure 2 shows a perspective view of the light module, without any additional dissipative body, figure 3 shows an exploded perspective view of the light module from below, Figure 4 shows an exploded perspective view from above of the light module and a generic dissipative body, figure 5 shows an exploded top perspective view of the light module, in an embodiment in which no adaptation frames are required, and figure 6 shows an exploded top perspective view of a support element with first connectors of the light module of figure 3, figure 7 shows a perspective view (first line) and a top view (second line) of the first conductor of the lighting apparatus in different orientations, figure 8 shows a perspective view from above in an exploded view of some elements of the lighting apparatus in accordance with an alternative embodiment, figure 9 shows a perspective view from below in an exploded view of some elements of the lighting apparatus of figure 8, figure 10 shows an exploded perspective view from above of the lighting apparatus of figure 8 and 9. DETAILED DESCRIPTION

[0014] A lighting apparatus, indicated in the figures with reference number 1, comprises: a supporting frame 22, an optical assembly 4 and a light module 3 arranged between the support element 22 and the optical assembly 4.

[0015] These assemblies and elements 22, 3 and 4 may be composed of various components, as described below.

[0016] The light module 3 is dedicated to the generation of light, and for this purpose comprises a light source 31, preferably one or more LEDs, configured to emit light when electrically powered.

[0017] The optical assembly 4 is dedicated to collecting the light generated by the light source 31 to obtain a beam with the desired properties, for example in terms of direction, amplitude and focus.

[0018] The optical assembly 4 can be made in various ways known to those skilled in the art. For example, the optical assembly 4 may include a lens and / or a reflector.

[0019] In the illustrated embodiment, an example of an optical assembly 4 is shown with a mounting body 41 having a central recess 411, open on the side opposite to the light module 3. Optionally, a lens 42 is mounted to the mounting body 41, and is positioned between the light source 31 and the recess 411 of the mounting body 41.

[0020] The support element 22 is generally dedicated to fixing the light source 3 and the optical assembly 4 to other bodies. In particular, the support element 22 is dedicated to the connection with a dissipative body 21, so as to form with it a single dissipative structure 2.

[0021] The dissipative body 21 is dedicated to avoiding overheating of the light source 31 by dispersing the excess heat it generates into the environment, preferably by natural ventilation.

[0022] In some embodiments, a dissipative body 21 is included in the light apparatus 1 of the invention. In other embodiments, the light apparatus 1 is provided without a dissipative body 21, and may be fixed thereto at a later time.

[0023] The dissipative body 21 is preferably provided with a plurality of aeration fins 211. The fins 211, preferably, protrude from a rear surface, but in other embodiments they can be positioned for example at a side surface.

[0024] The support element 22 is suitable for positioning on the dissipative body 21, in particular on a front surface of the dissipative body 21.

[0025] The support element 22 is arranged for fixing the light module 3 to the dissipative body 21, as described in more detail below.

[0026] In the illustrated embodiment, the dissipative body 21 and the support element 22 are formed in two distinct bodies, which can be fixed to each other. These parts are in surface contact with each other to maximize heat exchange, and are removably fixed to each other. For this purpose, one or more fixing holes 23 formed in both the dissipative body 21 and the support element 22 may be provided, and one or more first fixing elements 24, for example screws, configured to simultaneously engage respective fixing holes 23 of the dissipative body 21 and the support element 22.

[0027] A person skilled in the art will however be able to fix the dissipative body 21 and the support element 22 also in alternative ways.

[0028] An element capable of more effectively transferring the heat produced by the light source 31, such as for example a conductive thermal paste, graphite or other, can be interposed between the dissipative body 21 and the support element 22.

[0029] Furthermore, embodiments may also be provided in which the dissipative body 21 and the support element 22 are formed in one piece.

[0030] The light module 3 comprises a base 32, having a front surface 321 and an opposite rear surface 322 spaced apart in the axial direction X-X.

[0031] The rear surface 322 is in surface contact with the support element 22 or directly to the dissipative body 21 if the support element 22 is incorporated therein.

[0032] The light source 31 is instead removably fixed to the front surface 321 of the base 32. Preferably, for this purpose, the base 32 has a pitch 323 for fixing the light source 31.

[0033] The pitch 323 is located at the front surface 32 and can be identified, for example, by a recess in the front surface 321.

[0034] Optionally, the light module 3 comprises an adaptation frame 33 (figure 4), configured to adapt the light source 31 to be fixed to the front surface 321 of the base 32.

[0035] In particular, the frame 33 may have an outer perimeter with any shape and size corresponding to the pitch 323, and an opening having an inner perimeter with shape and size corresponding to the light source 31.

[0036] Thanks to this arrangement, the same base 32 can accommodate lighting devices 31 with different shapes and / or sizes.

[0037] For example, two substantially square-shaped light sources 31 with different dimensions are illustrated in the figures, and the pitch 323 is also square-shaped.

[0038] One of the light sources 31 has dimensions such as to be fixable directly in the pitch 323 without any frame 33, while the other needs a frame 33.

[0039] It should be noted that by varying the shape of the inner and outer perimeter of the frame 33, frames 33 can also be obtained for light sources 31 and / or pitches 323 with different shapes, for example circular, star-shaped, rectangular.

[0040] One aspect of the invention relates to a assembly kit 1 for the lighting apparatus in which one or more adaptation frames 33 may be included, for respective light sources 31. Such a kit may also include various of the main components of the lighting apparatus 1 to be assembled, including the support element 22, the optical assembly 4, the base 32 of the light module 3, and other parts mentioned below, such as the first connectors, while the light source 31 may be included in the kit or supplied separately.

[0041] According to a preferred aspect of the invention, the base 32 is made of high-dissipative material, for example aluminium / beryllium copper / phosphor bronze. This maximizes the transfer of heat from the light source 31 to the support element 22 and therefore to the possible dissipative body 21, but at the same time requires the arrangements described below to correctly feed the light source 31.

[0042] A plurality of first electrical contacts 251 from which the power is supplied are distributed on the support element 22. The light source 31 in turn comprises a plurality of second electrical contacts 311, isolated from the base 32.

[0043] Furthermore, the light source 31 comprises an lighting element 312, connected to the second electrical contacts 311 and configured to emit light when electrically powered through the second electrical contacts 311.

[0044] In the preferred embodiment, the light source 31 is realized as a printed circuit with an insulating board 313 on which the second electrical contacts 311, the lighting element 312 and conductive tracks connecting them to each other are positioned. In particular, the light source 31 can be a cob (chip on board) LED, in which one or more lighting elements are identified by LED chips on the insulating board 313 or alternatively a printed circuit board (PCB) of any type.

[0045] Preferably, the second electrical contacts 311 are arranged around the lighting element 312. For example, in the presence of two second contacts 311 these can be arranged on opposite sides with respect to the lighting element 312.

[0046] At least two second contacts 311 are generally required for the power supply of the light source 31. However, three or more second contacts 311 may also be provided, for example four contacts as illustrated in the figures. Adding more second contacts 311 may allow controlling the mode of operation of the light source 31.

[0047] For example, in an embodiment the lighting element 312 may comprise several lighting portions, preferably configured to emit light with different colour temperatures (function known as tunable white). Each lighting portion may be supplied by a distinct pair of second contacts 311. Thus, selectively powering of different pairs of second contacts 311 may result in monochromatic lights of different colour temperatures. Further, the intensity of light emitted for each colour may be variable as a function of a supply current received from the relative pair of second contacts 311.

[0048] In an alternative embodiment, a pair of second contacts 311 may serve the purpose of feeding, and at least one further second contact 311 may be a measuring contact, in particular for measuring a temperature of the lighting element 312. Advantageously, this allows the thermal state of the lighting element 312 to be monitored and controlled.

[0049] In another embodiment, the power supply of all the lighting portions comes from a single pair of second contacts 311 for the supply, and in addition one or more second contacts 311 of the type of control signal for the variation of light intensity (e.g. DALI, PWM, analogue) are provided.

[0050] To connect the first and the second electrical contacts 311, 251, the base 32 has a plurality of connector seats 324 and the light module 3 comprises a plurality of first connectors 34 removably fixed to the base 32 at the seats 324. It should be noted that the first electrical contacts 251 and the first connectors 34 can be in the same number of the second electrical contacts 311, or in certain embodiments even in a higher number, so that the base 32 and the support element 22 are compatible with light sources 31 with different numbers of second contacts 311.

[0051] In the preferred embodiment, the connector seats 324 are circumferentially disposed about the pitch 323. Further, each connector seat 324 extends from the front surface 321 to the rear surface 322 of the base 32, so that the respective first connector 324 reaches a second contact 251 on the support element 22. For example, each seat 324 may have a through hole extending through the base 32.

[0052] In the illustrated embodiment, each seat 324 also comprises a groove that connects the through hole to the pitch 323.

[0053] In other non-illustrated embodiments, each seat 324 may locate a recess on a side surface of the base 324, rather than a through hole.

[0054] Each first connector 34 comprises a conductor element 341 and an insulating element 342 fixed to the conductor element 341. The conductor element 34 places into contact a respective first electrical contact 251 of support element 22 and a respective second electrical contact 311 of light source 31.

[0055] As can be seen in figure 7, it should be noted that, advantageously, the insulating element 342 fixed to the conductor element 342 allows greater freedom in rotation of the entire first conductor 34, allowing an electrical connection with the second electrical contacts 311 of the light source 31 without the latter being positioned at necessarily fixed points. In fact, the light sources 31 can be made in configurations or types that can vary depending on a particular model or manufacturer. Such configurations may involve making second electrical contacts 311 at different points or areas of the light source depending on the aforementioned model or manufacturer.

[0056] On the contrary, in the case that the insulating element 342 is separated from the conductor element 341, a different orientation of the conductor element 341 could not guarantee the safety of electrical insulation required for the correct operation of the lighting apparatus 1. Therefore, in accordance with the present invention, the first conductor 34 comprising both the conductor element 341 and the insulating element 342 ensures, with respect to known lighting apparatuses, greater compatibility of the lighting apparatus 1 with different models of light sources 31, thus comprising the second electrical connections 311 possibly made in different areas depending on their type or configuration.

[0057] In the preferred embodiment, the conductor element 341 of each first connector 34 has a first leg 343 and a second leg 344.

[0058] The first leg 343 extends in the axial direction X-X along the entire thickness of the base 32, from the rear surface 322 to the front surface 321. In particular, the first leg 343 extends through the bore of a respective connector seat 324.

[0059] The second leg 344 is joined to the first leg 343 at a fold line. The second leg 344 extends on the front surface 321 of the base 32, transversely to the axial direction X-X, from the first leg 343 to a respective second electrical contact 311 of the light source 31.

[0060] In particular, the second leg 344 may extend all or in part into the connector seat groove 324. Thanks to this type of first connector 34, a connection can be made between the first and second contacts 311, 251 that is simpler and more reliable than in the case of electrical cables. In other embodiments, however, depending on the chosen light source 31, electrical cables may be used.

[0061] Preferably, at least a portion of the second leg 344 is oriented radially towards the central axis of the lighting apparatus 1. Advantageously, this radial section guarantees an electrical connection with a respective second contact 311 of the light source 31, which is sufficiently stable for different embodiments of the light source 31 that may have the second contacts 311 in more central or more peripheral positions. In the illustrated embodiment, for reasons of geometric optimization, the second leg 344 is in turn composed of two transverse sections.

[0062] The insulating element 342 electrically isolates the conductor element 341 from the base 32.

[0063] Preferably, the insulating element 342 is removably insertable into the connector seat 324, and is shaped to retain the conductor element 341. In particular, the insulating element 342 may have an insulating channel, suitable for receiving the first leg 343 and insertable in the hole of the seat 324.

[0064] Preferably, the insulating element 342 is shaped to form with the base 32 an anti-rotation interlock, which prevents unstable electrical contacts. For this purpose, the insulating element 342 may comprise an insulating shelf, which protrudes from the insulating channel in the groove of the seat 324 and is shaped to support at least in part the second leg 344.

[0065] Preferably, an end portion of the second leg 344 extends above the light source 31, up to a second electrical contact 311. Therefore, the insulating board 313 is at least partly interposed in the axial direction X-X between the front surface 321 of the base 32 and the second leg 344 of the conductor element 341.

[0066] The base 32 of the light module 3 is removably fixed to the support element 22. In an advantageous embodiment, the support element 22 and the base 32 comprise respective locking elements 221, 325, configured to make a rotation lock between the support element 22 and the base 32.

[0067] The rotation lock is intended as a lock that involves a relative rotation, for a predetermined locking angle, where present, between the support element 22 and the base 32. This rotation takes place in a circumferential direction, i.e. around a central axis that extends axially.

[0068] In an embodiment, the rotation lock is a bayonet lock, preferably with wedge surfaces. In an alternative, the lock may be a lock by one or more pairs of at least partially threaded portions.

[0069] Still preferably, the locking elements 221, 325 are configured to realize a lock with a movement between the support element 22 and the base 32 which is a simultaneous movement of rotation around the central axis and of translation in axial direction X-X. In this way, in the limit position of the lock, loosening and loss of heat exchange is avoided.

[0070] In one bayonet embodiment, each locking element 325 of the base 32 is hook-shaped, with an axial portion extending toward the support element 22, and a radial portion extending toward the central axis. Preferably, the radial portion has a wedge-shaped surface, i.e. a surface inclined helically with respect to the axial direction.

[0071] Furthermore, each locking element 221 of the support element 22 has a channel shaped to slidably receive the radial portion of the hook identified by the locking element 325 of the base 32. This channel has an axial portion, shaped to guide the locking element 325 of the base 32 towards and away from the support element 22. The channel then has a circumferential portion, shaped to guide the locking element 325 of the base 32 in rotation around the central axis for the locking angle.

[0072] Preferably, the circumferential portion of the channel has a wedge surface, i.e. a surface inclined helically with respect to the axial direction, complementary to the radial portion of the locking element 325 of the base 32. These wedge portions, together, make the contact between the base 32 and the support element 22 more stable.

[0073] In addition, each locking element 221 of the support element 22 has a socket shaped to retain in the axial direction X-X the radial portion of the hook identified by the locking element 325 of the base 32, when the radial portion is in the circumferential portion of the channel.

[0074] This allows the light module 3 and the support element 22 to be easily separated. Advantageously, in the event of a failure of the light source 31, it can be replaced without incurring additional costs for a new support element 22, with its components, and for the possible dissipative body 21. In addition, the light module 3 and the support element 22 are kept well fixed, to the advantage of the stability of the electrical connection, without the need for radial pressures.

[0075] For simple electrical contact, the first contacts 251 on the support element 22 are axially aligned with the connector seats 324. In consideration of the rotation determined by the rotation locking elements 221, 325, preferably each first electrical contact 251 has an exposed conductive surface extending in circumferential direction to an extent at least equal to the locking angle. Advantageously, this prevents electrical disconnections in the event of accidental rotations during use.

[0076] In the preferred embodiment, each first contact 251 is integrated in a respective second connector 25. The second connector 25 comprises a conductive element having a head portion, which identifies the first electrical contact 251, and a connection portion 252. In the illustrated embodiment, the connection portion 252 is identified by a cable, but embodiments with rigid or flexible connection portions 252 are also contemplated.

[0077] Furthermore, the second connector 25 comprises an insulating element that electrically separates the conductive element from the support element 22 and from the dissipative body 21. Preferably, the insulating element comprises a support 253 on which the first contact 251 is positioned. In particular, in the example, the first contact 251 and the support 253 identify a circuit board. Furthermore, the insulating element comprises a sheath 254 covering the connection portion 252.

[0078] The support element 22 has contact seats 222 for receiving the second connector 25. Preferably, each contact seat 222 has a through hole for the passage of the connection portion 252 and the sheath 254. Through holes 212 for passage of the connection portion 252 and the sheath 254 may also be provided in the dissipative body 21. This allows the connection portions 252 to emerge for example from the rear surface of the dissipative body 21 for connection to an external power supply.

[0079] Alternatively, the second connectors 25 may not emerge from the dissipative body 21, but merely reach further electrical contacts on the dissipative body 21, connectable to external electrical power supplies in various ways known to those skilled in the art.

[0080] For the purpose of fixing the optical assembly 4, preferably the light module 3 comprises a cover 35. Preferably, the cover 35 is made of electrically insulating material, but in the case of light sources 31 with high powers, conductive covers 35 can also be provided.

[0081] The cover 35 is removably fixed between the optical assembly 4 and the base 32 of the light module 3. To assemble the cover 35 to the base 32, one or more fixing holes 351, 326 formed in both the cover 35 and the base 32 may be provided, and one or more second fixing elements 36, e.g. screws, configured to simultaneously engage respective fixing holes 351, 326 of the cover 35 and the base 32.

[0082] Advantageously, the cover 35 presses the first connectors 34 against the base 3, ensuring good electrical contact with the second contacts 311 of the light source 31.

[0083] The cover 35 has a central opening 352 arranged between the light source 31 and the mounting body 41 of the optical assembly 4, for the passage of light towards the recess 411 of the mounting body 41.

[0084] For fixing the optical assembly 4 to the cover 35, preferably the mounting body 41 of the optical assembly 4 and the cover 35 comprise rotation locking elements 412, 353, which may be analogous to those already described for the base 32 and the support element 22. Advantageously, the optical assembly 4 can also be easily removed from the light module 3, and possibly replaced individually. The cover 35 fits different commercial and custom reflectors, lenses and hybrid optics.

[0085] In an alternative embodiment shown in figures 8-10, the locking elements 325 are not made at the base 32, but at the cover 35. That is, the support element 22 and the cover 35 comprise the aforementioned respective locking elements 221, 325. As the base 32 is interposed between the cover 35 and the support element 221, the base 32 itself is preferably shaped so as to allow a relative coupling between the locking elements 221, 325. For example, the base 32 may have slots to allow passage of the locking elements 325 to reach the locking elements 221.

[0086] It is clear that a person skilled in the art will be able to make numerous equivalent modifications to the variants set forth above, without thereby departing from the scope of protection as defined by the appended claims.

Examples

Embodiment Construction

[0014]A lighting apparatus, indicated in the figures with reference number 1, comprises:

a supporting frame 22, an optical assembly 4 and a light module 3 arranged between the support element 22 and the optical assembly 4.

[0015]These assemblies and elements 22, 3 and 4 may be composed of various components, as described below.

[0016]The light module 3 is dedicated to the generation of light, and for this purpose comprises a light source 31, preferably one or more LEDs, configured to emit light when electrically powered.

[0017]The optical assembly 4 is dedicated to collecting the light generated by the light source 31 to obtain a beam with the desired properties, for example in terms of direction, amplitude and focus.

[0018]The optical assembly 4 can be made in various ways known to those skilled in the art. For example, the optical assembly 4 may include a lens and / or a reflector.

[0019]In the illustrated embodiment, an example of an optical assembly 4 is shown with a mounting body 41 ...

Claims

1. Lighting apparatus (1), comprising: - a support element (22) fixable to, or integrated in, a dissipative body (21) configured to disperse heat, - a plurality of first electrical contacts (251) distributed on the support element (22); - a light module (3), comprising: - a base (32), having a front surface (321) and a rear surface (322) in contact with the support element (22), the base (32) being removably fixed to the support element (22), and - a light source (31) removably fixed to the front surface (321) of the base (32), the light source (31) comprising a plurality of second electrical contacts (311) and a light element (312) configured to emit light when electrically powered through the second electrical contacts (311); - an optical assembly (4) removably fixed to the light module (3) on the side opposite to the support element (22), the optical assembly (4) being configured to direct the light emitted by the light element (312) into a beam of light; characterized in that: - the base (32) of the light module (3) is made of a thermally dissipative material and has a plurality of connector seats (324), and - the light module (3) comprises a plurality of first connectors (34) removably fixed to the base (32) at respective connector seats (324), - each first connector (34) comprises a conductor element (341), which places into contact a respective first electrical contact (251) on the support element (22) and a respective second electrical contact (311) of the light source (31), and an insulating element (342) that electrically insulates the conductor element (341) from the base (32).

2. Lighting apparatus (1) according to Claim 1, wherein: - the base (32) of the light module (3) has a platform (323) for fixing the light source (31), located at the front surface (321), - the connector seats (324) are arranged around the platform (323), each connector seat (324) extending from the front surface (321) to the rear surface (322) of the base (32).

3. Lighting apparatus (1) according to Claim 1 or 2, wherein the conductor element (341) of each first connector (34) has: - a first leg (343), which extends from the rear surface (322) to the front surface (321) of the base (32), and - a second leg (344), which extends on the front surface (321) of the base (32), from the first leg (343) to the respective second electrical contact (311) of the light source (31), preferably the second leg (344) having at least one section oriented radially towards a central axis of the lighting apparatus (1).

4. Lighting apparatus (1) according to any of Claims 1 to 3, comprising a plurality of second connectors (25), wherein each second connector (25) comprises: - a conductive element having a head portion, which identifies the first electrical contact (251), and a connection portion (252) extending through the support element (22), - an insulating element (253), carrying the head portion of the conductive element of the second connector (25), preferably wherein the insulating element (253) and the respective first contact (251) are made as a printed circuit.

5. Lighting apparatus (1) according to any of Claims 1 to 4, comprising a dissipative body (21) configured to disperse heat, wherein the support element (22) is positioned between the dissipative body (21) and the light module (3) and is in contact with them.

6. Lighting apparatus (1) according to any of Claims 1 to 5, wherein: - the optical assembly (4) comprises a mounting body (41) with a central recess (411), and an opening positioned between the light element (312) and the recess (411) of the mounting body (41), - the light module (3) comprises a cover element (35) removably fixed between the mounting body (41) and the base (32) of the light module (3).

7. Lighting apparatus (1) according to Claim 6, wherein the support element (22) and the cover element (35) of the light module (3) comprise respective locking elements (221, 325) configured to achieve a rotational locking between the support element (22) and the base (32), for example a threaded, bayonet or magnetic screw lock.

8. Lighting apparatus (1) according to Claims 1 to 6, wherein the support element (22) and the base (32) of the light module (3) comprise respective locking elements (221, 325) configured to achieve a rotational locking between the support element (22) and the base (32), for example a threaded, bayonet or magnetic screw lock.

9. Lighting apparatus (1) according to Claim 7 or 8, wherein: - the locking elements (221, 325) are configured to achieve the locking by rotating about a central axis for a predetermined locking angle, and - each first electrical contact (251) has an exposed conductive surface that extends in a circumferential direction around the central axis for an extension at least equal to the locking angle.

10. Lighting apparatus (1) according to any of Claims 1 to 9, comprising two, three or more first contacts (251), two three or more second contacts (311) and two, three or more first connectors (34), wherein the light source (31) is configured to emit light with a variable intensity as a function of a power received by a pair of second contacts (311), and to emit light of different colours as a function of a power received by at least one further second contact (311).

11. Assembly kit for a lighting apparatus (1) according to any of Claims 1 to 10, comprising: - said support element (22), fixable to, or integrated in, a dissipative body (21), - said optical assembly (4), - the base (32) and the plurality of first connectors (34) of said light module (3), - one or more adaptation frames (33), wherein each adaptation frame (33) is configured to adapt lighting devices of different shapes and / or sizes for fixing to the front surface (321) of the base (32).

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