EP3318799A1

EP3318799A1 - A connector for lighting devices, corresponding lighting device and method

Info

Publication number: EP3318799A1
Application number: EP17197271.4A
Authority: EP
Inventors: Mr. Simon BOBBO; Mr Roberto DIDONE'; Mr. Alberto ZANOTTO
Original assignee: Osram GmbH; Osram SpA
Current assignee: Osram GmbH; Osram SpA
Priority date: 2016-11-04
Filing date: 2017-10-19
Publication date: 2018-05-09
Anticipated expiration: 2037-10-19
Also published as: EP3318799B1

Abstract

An electrical connector (100), e.g. for elongate LED modules (M), includes: - a tubular casing (102) having a longitudinal axis (X102) and a distal end (102a) coupleable to an end portion (E) of an elongate lighting module (M), - a tilting member (106) tiltable between a position retracted away from the distal end (Figure 3) and a position advanced towards the distal end (Figure 4) about a tilting axis (X106) extending transversely of said longitudinal axis (X102), - one or more tooth-like electrical contact(s) (108) carried by tilting member (106) facing towards distal end (102) of the casing of the connector (100), the electrical contact (s) (108) being adapted to penetrate into the end portion (E) of the lighting module (M) as a result of the tilting member (106) tilting from the retracted position to the advanced position.

Description

Technical Field

The present description relates to lighting devices.
One or more embodiments may be applied to lighting devices employing electrically-powered light radiation sources, e.g. solid-state lighting sources such as LED sources.

Technological Background

In the field of lighting devices, such as e.g. elongate (ribbon-like, optionally flexible) LED modules, it is desirable to implement connectors adapted to be coupled at one end of a module, so as to establish an electrical connection (power supply and optionally control) of the radiation sources included in the module.
In various application scenarios, the need has been felt of a connector which does not jeopardize the module protection features against the penetration of foreign agents (e.g. with an IP protection degree, such as IP6X).
In order to meet such needs connectors may be used which are adapted to be plugged into a head section of the module.
Such solutions may be quite bulky, the connector having large external dimensions, making it clearly visible from the outside and imparting it an unpleasant appearance. Moreover, the installation of such connectors may be cumbersome and complicated.
There are known, moreover, connectors which may be inserted into the module at a head location, a female part of the connector being co-moulded, glued or fixed in any other way. In this case, a module may be cut to length according the application and usage needs, but the scraps deriving from the cutting operation may no longer be usable.
Other solutions have been proposed which enable plugging a connector also at such cut portions; however, in this case the risk arises of obtaining uncertain fixing conditions, and/or solutions wherein the connector appears out of proportion with respect to the module, due to its size.

Object and Summary

One or more embodiments aim at overcoming the previously described drawbacks.
According to one or more embodiments, said object may be achieved thanks to a connector 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 teaching provided herein with reference to the embodiments.
One or more embodiments may lead to achieve a connector having an overall reduced size, adapted to be plugged (even by the final user) into a cut end of a lighting module having a small size. This is true also if said end portion originates from cutting the module, in order to meet specific application and usage needs.
One or more embodiments may offer one or more of the following advantages:

possibility of obtaining connectors for (e.g. ribbon-like, flexible) lighting modules having an IP protection degree and employing solid-state light radiation sources (SSL, e.g. LED sources),
the assembly (connector and module) obtained from the application of the connector at one end of the module is adapted to be easily installed and has a pleasant appearance, e.g. since the connector has cross-section dimensions which do not appreciably exceed the corresponding dimensions of the lighting module,

the lighting module may be cut to length, and the connector may be plugged also onto "scraps" deriving from the cutting operation,
firm retention of the connector on the module, with an IP degree protection,
the connector is light and compact and does not require large spaces during installation; for example, in the case of an installation on a flat surface, thanks to the small size of the connector, especially under the LED module, the module does not bend appreciably,
possibility of replacing the connector, of disconnecting and reconnecting a given connector into another module or at another location of the same module.

Brief Description of the Figures

One or more embodiments will now be described, by way of non-limiting example only, with reference to the annexed Figures, wherein:

Figure 1 is a perspective view of a lighting device making use of embodiments,
Figure 2 exemplifies, in a magnified scale, the operation criteria of one or more embodiments,
Figures 3 and 4 show possible subsequent usage steps of one or more embodiments,
Figures 5 to 8 show possible features of one or more embodiments,
Figure 9 exemplifies possible installation steps of one or more embodiments, and
Figure 10, substantially corresponding to a section along line X-X of Figure 8, shown in a magnified scale, exemplifies possible features of embodiments.

It will be appreciated that, for simplicity and clarity of illustration, the various Figures may not be drawn to the same scale.

Detailed Description

In the following description, various specific details are given to provide a thorough understanding of various exemplary embodiments of the present specification. One or more 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 in order 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 the Figures, reference M denotes a lighting device (module) having an elongate (optionally ribbon-like and/or flexible) shape, adapted to employ electrically-powered light radiation sources, e.g. solid-state light radiation sources (SSL) such as LED sources.
Such modules M may include (see e.g. Figure 10) a channel-shaped casing M12, hosting a support M14 substantially similar to a Printed Circuit Board (PCB) carrying electrically-powered light radiation sources M16, e.g. LED sources.
A sealing mass M18 including e.g. a diffusive light-permeable material is adapted to be inserted inside casing M12, thus providing a module M as considered herein with protection features against the penetration of foreign agents (e.g. having an IP protection degree). An optical element M180, e.g. having the properties of a lens, may be placed facing sources M14.
The power supply (and optionally the control) of sources M16 may be implemented via electrical lines, exemplified herein as two lines M20 extending on support M12 lengthwise of module M.
A module as module M (adapted to have any shape and size, e.g. having a cross section which may be rectangular - as in the presently illustrated non-limiting examples, - or square, polygonal, circular, etc.) may have a surface S, e.g. a front surface, wherefrom the light radiation is emitted.
Lighting devices (modules) of the previously described exemplary type are known in the art, which makes it unnecessary to provide a more detailed description herein.
Moreover, a module M as illustrated herein may be considered in itself as a module of indefinite length, adapted to be cut to length according to the application and usage needs.
The cutting operation may originate end surfaces (which usually extend in a transversal plane with respect to the lengthwise extension of the module) which may be left uncovered, since the protection against the penetration of foreign agents may be jeopardized by the cutting operation.
One or more embodiments may therefore provide a connector 100 which, in addition to facilitating the mechanical and electrical connection (power supply and optionally control) of the light radiation sources, e.g. the sources denoted as M16 in Figure 10, with one or more electric cables C, may favour achieving and/or maintaining protection features of the assembly of module M and connector 100 against the penetration of foreign agents, e.g. with an IP protection degree.
In one or more embodiments, connector 100 may include a casing 102 adapted to have a general tubular (closed or open) shape, with a section profile enabling the fitting thereof onto an end portion E of module M.
In one or more embodiments as exemplified in the Figures, module M may have a rectangular cross-section profile, and also casing 102 of connector 100 may have a rectangular cross-section profile. In one or more embodiments, if module M has a different cross-section profile, connectors 100 may be used which have a casing 102 with a correspondingly different cross-section profile, so as to enable connector 100 to be fitted onto an end portion E of module M, optionally in tight-fitting conditions.
It will be appreciated that the end portion E of module M onto which connector 100 is adapted to be fitted may derive from cutting to length a module M initially having indefinite length. In one or more embodiments, reference E denotes any one of the mutually facing ends deriving from cutting to length a module M. A connector 100 according to one or more embodiments is thus adapted to be fitted also on fragments, i.e. scraps, deriving from cutting to length a module M.
In one or more embodiments, casing 102 may be considered as having a "distal" end 102a, destined to be fitted onto module M and, on the opposite side, a "proximal" end 102b which is adapted, in one or more embodiments, e.g. exemplified in Figures 1 and 8, to be closed by an end cap 104, acting so to say as a closing plug of casing 102 of connector 100.
In one or more embodiments, said cap 104 may be traversed (optionally sealingly closing and therefore safeguarding the protection degree) by one or more cables C, adapted to establish an electrical contact e.g. with lines M20 (Figure 10), so as to act as power supply and optionally control cables for the light radiation sources (e.g. M16) of module M.
In one or more embodiments, connector 100 may include (mounted e.g. by means of pins or pivots on casing 102) a tilting member 106, adapted to tilt back and forth about an axis X106 extending transversely of the longitudinal extension direction of casing 102 (and therefore of module M), denoted e.g. as X102 in Figures 3 to 7.
For example, in one or more embodiments as exemplified herein, wherein module M of connector 100 has a rectangular cross-section profile, axis X106 may extend in the direction of one of the pairs of sides (e.g. of the longer sides) of said section profile.
As schematically exemplified in Figures 3 and 4, in one or more embodiments member 106 may be adapted to perform - with respect to axis X106 - a tilting (or swivelling) movement between:

a "proximal" return position, i.e. a position retracted away from end 102a, which is to be fitted onto module M (see Figure 3), and
a "distal" position, i.e. an advanced position, protruding towards end 102a, which is to be fitted onto module M (see Figure 4).

In one or more embodiments, connector 100 may also be provided (e.g. at casing 102) with a stopping formation 102c adapted to include e.g. a tooth or similar latch mechanism adapted to retain, e.g. by snap-fitting, the tilting member 106 in the advanced/distal position thereof (see e.g. Figures 4 to 7) .
In one or more embodiments casing 102, cap 104 and tilting member 106 of connector 100 may comprise a moulded plastic material.
In one or more embodiments, member 106 may be implemented as a prism-shaped body, e.g. with triangular cross-section, coupled by means of a pivot to the body of connector 100 in such a way as to locate axis X106 approximately at one of the edges of prism 102. Of course, one or more embodiments may envisage a member 106 having a different shape.
In one or more embodiments member 106 may carry, in a generally distal position, i.e. in a position facing end 102a which is to be fitted on a module M, one or more electrical contacts 108 adapted to be connected to cable(s) C converging into connector 100.
For example, in the presently exemplified embodiments, wherein reference is made to the possible presence of two cables C adapted to establish an electrical contact with two lines M20 in module M, there may be provided two contacts 108, e.g. positioned side by side.
The number of contacts 108 (optionally three or more) may be any number, selected as a function of the application and usage conditions.
In one or more embodiments, the contact(s) 108 may have a tooth-like shape, e.g. a puncturing profile (having e.g. a sharp end).
In one or more embodiments, contact (s) 108 may have a generally arch-shaped curved (e.g. at least approximately circular) profile, with the concavity facing axis X106.
As a consequence (as it may be appreciated e.g. in the sequence of Figures 3 and 4), the tilting movement of member 106 from the retracted or proximal position (Figure 3) to the advanced or distal position (Figure 4), thereby approaching end 102a fitted onto module M, may lead contact(s) 108 to penetrate into the end portion E of module M by puncturing it (e.g. at the location of the sealing mass M18).
In this way, contact(s) 108 may establish an electrical contact (optionally also with a certain puncturing effect) with electrically conductive lines M20 (Figure 10) connected to the light radiation sources M16, supporting therefore the implementation of an electrical contact between the sources and cable(s) C.
Said penetrating movement, which is adapted to take place along a curved path (the centre whereof approximately corresponds to axis X106) originates moreover a sufficiently firm mechanical contact between connector 100 and module M, since contact(s) 108 act as teeth which "bite" module M, so that connector 100 is anchored on module M.
In one or more embodiments, said puncturing movement may be supported by employing - for the portion of module M which is "bitten" by contact(s) 108 - a material such as silicone, into which contact (s) 108 may penetrate without requiring the exertion of a significant force in order to produce the corresponding tilting movement of member 106a.
In one or more embodiments, member 106 (which may be e.g. prism-shaped) may have an end 106a (e.g. an edge) adapted 106a to optionally protrude outside casing 102, and to perform the function of an actuating portion of the member, i.e. a portion which may be acted upon (e.g. by means of a finger) to tilt member 16 from the retracted position of Figure 3 to the advanced position of Figure 4.
In one or more embodiments, the distance between contact (s) 108 and tilting axis X106 may be shorter than the distance between tilting axis X106 and actuating portion 106a, which may be acted upon to tilt member 16. In this way a favourable lever effect is obtained, adapted to reduce the force which must be exerted to achieve the penetration of contact (s) 108 into module M.
In one or more embodiments, the presence of the stopping element 102c may moreover help member 106 to remain in the distal position, where contact(s) 108 penetrate into module M.
In one or more embodiments (see e.g. Figure 5), member 106 may be associated with a bias member 110 (e.g. a helical spring torsionally acting at the tilting axis X106), which biases member 106 towards the distal position, thus cooperating both with the penetration movement of contact(s) 108 into module M and with the action of retaining member 106 in the distal position.
In one or more embodiments, the retention of contact(s) 108 in engagement with module M may be made firmer by locally applying adhesive matter.
In one or more embodiments, the retention of connector 100 fitted onto end E of module M may be supported by various means, e.g. by means of a double-sided adhesive tape 112 (visible in Figure 10) between casing M12 of module M and a wall facing the same of casing 102 of connector 100.
In one or more embodiments, a glue (e.g. a silicone adhesive) may be applied on the whole or on part of the surface of connector 100 which is fitted onto end E of module M.
In one or more embodiments, one or more solutions for consolidating the connection described in the foregoing may help achieving a protection degree against the penetration of foreign agents, e.g. with an IP protection degree.
In one or more embodiments, the sealing action of connector 100 on end E of module M may optionally be strengthened by fitting and shrinking, around the portion of connector 100 which is coupled to module M, a cable tie 114 (see e.g. Figure 6) substantially similar to a hose clamp, e.g. as commonly used to ensure the tightness of hydraulic pipes.
In one or more embodiments, the body of connector 100 may include, at least in the distal portion 102a which is to be fitted onto module M, a deformable material (e.g. a plastic material, a silicone material, etc.) adapted to shrink around module M, with a clamping action which may be increased by applying a cable tie, such as band 114 exemplified in Figure 6.
In one or more embodiments, the inner surface of distal portion 102a of connector 100, which is to be fitted onto end E of module M, may be provided with tiny ribs (or generally speaking of sculptured formations) 116, having a height, e.g., of about 0.3-0.4 mm, adapted to perform a sealing function at least approximately similar to an O-ring.
The coupling of end cap or plug 104 with casing 102 (see the partially exploded perspective view of Figure 8) may entail, in one or more embodiments, a coupling (by form fitting, e.g. a dovetail coupling, a male-female joint, etc. and/or by means of an adhesive) that is adapted to favour the achievement of an IP protection degree, which may also be quite high. This also applies to the passage of cable(s) C through openings 104a in cap 104, which are adapted to be implemented (as commonly known) in such a way as to ensure a desired protection degree.
Figure 9 exemplifies the possibility, offered by one or more embodiments, of mounting a lighting device including a module M having, associated thereto, a connector 100 as exemplified herein, in installation conditions which are not easily achievable in traditional solutions.
For example, Figure 9 exemplifies the possibility of realizing, into a mounting surface (e.g. wall W), a groove G wherein the assembly including module M and connector 100 may be placed, as schematically illustrated in a dashed line in Figure 9, i.e. with a minimum outward protrusion (practically flush with surface W).
For this purpose it is possible to take advantage of the fact that, as exemplified in Figure 10, connector 100 (the casing 12 whereof is shown in Figure 10) has cross-section dimensions which are slightly larger than module M.
In one or more embodiments, a mounting condition as exemplified in Figure 9 may be easily achieved e.g. by applying, on the bottom of groove G, a double-sided adhesive tape T.
Finally, it will be appreciated that features or details exemplified with reference to one of the previously described Figures are adapted to be transposed (individually or in mutual combination) also to embodiments exemplified in different Figures.
One or more embodiments may therefore concern an electrical connector (e.g. 100), including:

a tubular casing (e.g. 102) having a longitudinal axis (e.g. X102) and a distal end (e.g. 102a) coupleable to an end portion (E) of an elongate lighting module (M),
a tilting member (e.g. 106) adapted to tilt between a position retracted away from said distal end (see e.g. Figure 3) and a position advanced towards said distal end (see e.g. Figure 4) about a tilting axis (e.g. X106) extending transversely of said longitudinal axis, and
at least one tooth-like electrical contact (see e.g. the two contacts 108) carried by said tilting member facing towards said distal end of the connector casing, the at least one electrical contact being adapted to penetrate into said end portion of the lighting module as a result of the tilting member tilting from said retracted position to said advanced position.

In one or more embodiments, said at least one tooth-like contact may include a tapered puncturing shape.
In one or more embodiments, said at least one tooth-like electrical contact may include an arched shape, with concavity towards said tilting axis.
In one or more embodiments, said casing may include a proximal end (e.g. 102b) opposite said distal end, with said tilting member having an actuating portion adapted to protrude from said proximal end of the connector casing (at least when said tilting member is in said retracted position), wherein said tilting member is tiltable from said retracted position to said advanced position by force exerted on said actuating portion.
In one or more embodiments, said casing may include a latch member (e.g. 102c) for latching, preferably by snap-fit action, the tilting member in said advanced position.
One or more embodiments may include an elastic bias member, preferably a helical spring (e.g. 110) acting around said tilting axis, adapted to bias said tilting member towards said advanced position.
One or more embodiments may include (in order to facilitate the sealing coupling of said distal end of the connector around said end portion of the lighting module) at least one feature out of:

a band-like member (e.g. 114) arranged and shrinkable around said distal end of the connector casing, and/or
surface sculpturing (e.g. 116) at the inner surface of the distal end of the connector casing, and/or
adhesive matter (e.g. 112) at the inner surface of the distal end of the connector casing.

In one or more embodiments, said casing may include a proximal end opposite said distal end with an end cap (e.g. 104) for sealingly closing said proximal end, said end cap optionally including a sealed passageway (e.g. 104a) for at least one electrical cable (e.g. C).
One or more embodiments may concern a lighting device (M, 100), including:

an elongate lighting module having an end portion, and
an electrical connector according to one or more embodiments, arranged with said distal end coupled with said end portion of the lighting module, with said tilting member in said advanced position and said at least one tooth-like electrical contact penetrated into said end portion of the lighting module.

A method according to one or more embodiments may include:

providing an elongate lighting module having an end portion,
providing an electrical connector according to one or more embodiments,
coupling said electrical connector with said lighting module by coupling the distal end of the casing of the electrical connector with said end portion of the lighting module, with said tilting member in said proximal position, and
tilting said tilting member to said distal position, wherein said at least one electrical contact penetrates said end portion of the lighting module.

Without prejudice to the basic principles, the implementation 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.

Claims

An electrical connector (100), including:
- a tubular casing (102) having a longitudinal axis (X102) with a distal end (102a) coupleable to an end portion (E) of an elongate lighting module (M),

- a tilting member (106) tiltable between a position retracted away from said distal end (102a) and a position advanced towards said distal end (102a) about a tilting axis (X106) extending transversely of said longitudinal axis (X102),

- at least one tooth-like electrical contact (108) carried by said tilting member (106) facing towards said distal end (102a) of the connector casing (102), the at least one electrical contact (108) adapted to penetrate into said end portion (E) of the lighting module (M) as a result of the tilting member (106) tilting from said retracted position to said advanced position.
The electrical connector (100) of claim 1, wherein said at least one tooth-like electrical contact (108) includes a tapered puncturing shape.
The electrical connector (100) of claim 1 or claim 2, wherein said at least one tooth-like electrical contact (108) includes an arched shape, with concavity towards said tilting axis (X106).
The electrical connector (100) of any of the previous claims, wherein said casing (102) includes a proximal end (102b) opposite said distal end (102a), with said tilting member (106) having an actuating portion (106a) adapted to protrude from said proximal end (102a) of the casing (102), wherein said tilting member (106) is tiltable from said retracted position to said advanced position by force exerted on said actuating portion (106a).
The electrical connector (100) of any of the previous claims, wherein said casing (102) includes a latch member (102c) for latching, preferably by snap-fit action, the tilting member (106) in said advanced position.
The electrical connector (100) of any of the previous claims, including a bias member, preferably a helical spring (110) acting around said tilting axis (106), biasing said tilting member (106) towards said advanced position.
The electrical connector (100) of any of the previous claims, including at least one feature out of:
- a band-like member (114) arranged and shrinkable around said distal end (102a) of the connector casing (102), and/or

- surface sculpturing (116) at the inner surface of the distal end (102a) of the connector casing (102), and/or

- adhesive matter (112) at the inner surface of the distal end (102a) of the connector casing (102).
The electrical connector (100) of any of the previous claims, wherein said casing (102) includes a proximal end (102b) opposite said distal end (102a) with an end cap (104) for sealingly closing said proximal end (102b), said end cap (104) preferably including a sealed passageway (104a) for at least one electrical cable (C).
A lighting device (M, 100) including:
- an elongate lighting module (M) having an end portion (E), and

- an electrical connector (100) according to any of claims 1 to 8 having said distal end (102a) coupled with said end portion (E) of said lighting module (M), with said tilting member (106) in said advanced position and said at least one tooth-like electrical contact (108) penetrated into said end portion (E) of the lighting module (M).
A method including:
- providing an elongate lighting module (M) having an end portion (E),

- providing an electrical connector (100) according to any of claims 1 to 8,

- coupling said electrical connector (100) with said lighting module (M) by coupling the distal end (102a) of the casing (102) of the electrical connector (100) with said end portion (E) of the lighting module (M) with said tilting member (106) in said retracted position, and

- tilting said tilting member (106) to said advanced position, wherein said at least one tooth-like contact (108) penetrates said end portion (E) of the lighting module (M).