A luminaire for exterior lighting

Abstract

A luminaire for exterior lighting is provided. The luminaire comprises a mounting assembly comprising a securing portion, wherein the securing portion is configured to secure at least one light source; a body configured to at least partially cover the securing portion, wherein the body comprises a hygroscopic material; and a fixing arrangement configured to connect the body to the mounting assembly, wherein the fixing arrangement comprises a bias configured to compensate for deformation of the body to maintain a fastening force.

Description

TECHNOLOGICAL FIELD

[0001] Examples of the present disclosure relate to a luminaire for exterior lighting.BACKGROUND

[0002] Luminaires are used to provide exterior lighting, such as for streets, tunnels, or public access.BRIEF SUMMARY

[0003] According to various, but not necessarily all, examples there is provided a luminaire for exterior lighting. The luminaire comprises a mounting assembly comprising a securing portion, wherein the securing portion is configured to secure at least one light source; a body configured to at least partially cover the securing portion, wherein the body comprises a hygroscopic material; and a fixing arrangement configured to connect the body to the mounting assembly, wherein the fixing arrangement comprises a bias configured to compensate for deformation of the body to maintain a fastening force.

[0004] The body may be made from wood.

[0005] The fixing arrangement may comprise a fastener configured to extend through a connecting hole in the body.

[0006] In at least one direction, a clearance may be provided between the connecting hole in the body and the fastener.

[0007] In at least one direction, the connecting hole in the body may be at least 1.4 times wider than the fastener.

[0008] The fixing arrangement may comprise a spring configured to create the bias.

[0009] The spring may be a helical spring comprising more than one turn.

[0010] The fastener may comprise a head and the spring may be configured to urge at least a portion of the bias against the head of the fastener.

[0011] The spring may comprise closed ends.

[0012] When the body is connected to the mounting assembly, a spacing may be provided between turns of the spring.

[0013] The fastener may comprise an elongate shaft, and the bias may be imparted along an axis parallel to the elongate shaft of the fastener. In at least one direction, a clearance may be provided between the elongate shaft of the fastener and the connecting hole in the body.

[0014] The mounting assembly may comprise a fastening portion configured to receive at least a portion of the fastener.

[0015] The fixing arrangement may comprise a mating part configured to receive and engage with a portion of the fastener through the fastening portion such that the body and the mounting assembly are connected.

[0016] The mating part may comprise a stop configured to restrict the portion of the fastener received by the mating part.

[0017] The luminaire may comprise a compression limiter configured to limit further tightening of the fixing arrangement and enable a degree of freedom of movement of the body when the fixing arrangement is at a peak tightness as determined by the compression limiter.

[0018] The luminaire may comprise a circuitry enclosure configured to be secured to the securing portion to form a cavity. The body may be configured to at least partially cover the circuitry enclosure.

[0019] The cavity may be configured to house circuitry configured to supply power to the at least one light source.

[0020] The at least one light source may be configured to be secured to a first surface of the securing portion. The circuitry enclosure may be configured to be secured to a second surface of the securing portion. The first and second surfaces may be separated by a thickness of the securing portion.

[0021] The circuitry enclosure may comprise a hole configured to receive at least a portion of a sensor device. The body may comprise a corresponding hole configured to receive at least a portion of the sensor device.

[0022] The luminaire may comprise the sensor device. The sensor device may be configured to make electrical contact with circuitry housed by the circuitry enclosure through the hole in the circuitry enclosure and the corresponding hole in the body.

[0023] The mounting assembly may comprise a mounting portion configured to mount the luminaire such that, when the luminaire is mounted, the luminaire is mounted in a cantilever manner.

[0024] The mounting assembly may comprise a discontinuity configured to receive a cable for supplying power to the at least one light source.

[0025] The body may comprise a sloped upper surface to divert water runoff.

[0026] When the body is connected to the mounting assembly, at least a portion of a bottom surface of the body may be arranged to extend to or beyond the securing portion.

[0027] According to various, but not necessarily all, examples there is provided a luminaire for exterior lighting. The luminaire comprises a mounting assembly comprising a securing portion, wherein the securing portion is configured to secure at least one light source; a body configured to at least partially cover the securing portion; and a fixing arrangement configured to connect the body to the mounting assembly, wherein the fixing arrangement comprises a bias configured to compensate for deformation of the body to maintain a fastening force.

[0028] According to various, but not necessarily all, examples there is provided a luminaire for exterior lighting. The luminaire comprises a mounting assembly comprising a securing portion, wherein the securing portion is configured to secure at least one light source; a circuitry enclosure configured to be secured to the securing portion to form a cavity; and a body configured to at least partially cover the circuitry enclosure, wherein the body comprises a hygroscopic material.

[0029] The body may be made from wood.

[0030] The cavity may be configured to house circuitry configured to supply power to the at least one light source.

[0031] The at least one light source may be configured to be secured to a first surface of the securing portion. The circuitry enclosure may be configured to be secured to a second surface of the securing portion. The first and second surfaces may be separated by a thickness of the securing portion.

[0032] The circuitry enclosure may comprise a hole configured to receive at least a portion of a sensor device. The body may comprise a corresponding hole configured to receive at least a portion of the sensor device.

[0033] The luminaire may comprise the sensor device. The sensor device may be configured to make electrical contact with circuitry housed by the circuitry enclosure through the hole in the circuitry enclosure and the corresponding hole in the body.

[0034] The mounting assembly may comprise a mounting portion configured to mount the luminaire such that, when the luminaire is mounted, the luminaire is mounted in a cantilever manner.

[0035] The mounting assembly may comprise a discontinuity configured to receive a cable for supplying power to the at least one light source.

[0036] The body may comprise a sloped upper surface to divert water runoff.

[0037] When the body is connected to the mounting assembly, at least a portion of a bottom surface of the body may be arranged to extend to or beyond the securing portion.

[0038] According to various, but not necessarily all, examples there is provided examples as claimed in the appended claims.

[0039] While the above examples of the disclosure and optional features are described separately, it is to be understood that their provision in all possible combinations and permutations is contained within the disclosure. It is to be understood that various examples of the disclosure can comprise any or all of the features described in respect of other examples of the disclosure, and vice versa. Also, it is to be appreciated that any one or more or all of the features, in any combination, may be implemented by / comprised in / performable by an apparatus, a method, and / or computer program instructions as desired, and as appropriate.BRIEF DESCRIPTION

[0040] Some examples will now be described with reference to the accompanying drawings in which: FIG. 1A shows a schematic diagram of an example of a luminaire with a cover; FIG. 1B shows a schematic diagram of the luminaire with the cover being deformed; FIG. 2 shows a side-view cross-section of the luminaire; FIG. 3 shows a close-up view of an example fixing arrangement; FIG. 4A shows a side-view cross-section of the luminaire; and FIG. 4B shows a cross-section view of the luminaire.

[0041] The figures are not necessarily to scale. Certain features and views of the figures can be shown schematically or exaggerated in scale in the interest of clarity and conciseness. For example, the dimensions of some elements in the figures can be exaggerated relative to other elements to aid explication. Similar reference numerals are used in the figures to designate similar features. For clarity, all reference numerals are not necessarily displayed in all figures.DETAILED DESCRIPTION

[0042] Embodiments of the present disclosure relate to a luminaire.

[0043] FIGs. 1A and 1B show a side-view of an example of a luminaire 100, where the luminaire 100 is for exterior lighting, such as for area lighting. The luminaire 100 comprises a body 110, in the form of a cover. FIGs. 1A and 1B are the same except FIG. 1A shows the body 110 before it has deformed, whereas FIG. 1B shows the body 110 after deformation. The deformation may occur over time. The body 110 may comprise a hygroscopic material, such as wood, which over time deforms when subjected to ambient conditions. For example, the body 110 may absorb moisture from the air which causes the body 110 to deform over time, such as warp, twist or split. In other words, the shape of the body 110 may change over time. In some examples, the body 110 is made from wood. Although depicted as being rectangular in shape, the body 110 may be of any shape.

[0044] The luminaire 100 comprises a mounting assembly 120 and a fixing arrangement 130. The fixing arrangement 130 is configured to connect the body 110 to the mounting assembly 120. In particular, the fixing arrangement 130 is configured to maintain the connection between the body 110 and the mounting assembly 120 even when the body 110 has deformed, as shown in FIG. 1B. The fixing arrangement 130 comprises a bias configured to compensate for deformation of the body 110 to maintain a fastening force. An example of the fixing arrangement 130 is discussed below in relation to FIG. 3. In the illustrated examples of FIGs. 1A and 1B, the fixing arrangement 130 is shown in a particular direction (i.e., along the longitudinal direction of the luminaire 100, which is parallel to the x-direction), but it is envisaged that the fixing arrangement may be positioned in any direction when connecting the body 110 and the mounting assembly 120. In particular, the luminaire 100 is arranged in a cantilever manner, and the fixing arrangement 130 is shown parallel to the cantilever direction of the luminaire 100.

[0045] The mounting assembly 120 comprises a mounting portion 122 (for example a mounting bracket) and a securing portion 124 (for example a securing plate). In some examples, the mounting portion 122 may be fixedly attached to the securing portion 124, or the mounting portion 122 and the securing portion 124 may be integrally formed. The mounting portion 122 and / or the securing portion 124 may be formed from one or more rigid materials, such as plastic and / or metal. The body 110 and the securing portion 124 are individually / separately supported by the mounting portion 122.

[0046] The mounting portion 122 is configured to mount the luminaire 100, for example to a lamppost. In some examples, such as in FIGs. 1A and 1B, the mounting portion 122 is arranged such that the luminaire 100 is mounted, or mountable, in a cantilever manner. The mounting portion 122 may form a first part of a cantilever, and the body 110 may form a second part of the cantilever. The mounting portion 122 may be a bracket arm. The mounting assembly 120 may be arranged such that the luminaire 100, and specifically the at least one light source 140, is cantilevered from the lamppost, for example.

[0047] The mounting portion 122 has a height which is parallel to the y-direction. The height of the mounting portion 122 separates a lower surface 1221 and an upper surface 1122. As illustrated in FIGs. 1A and 1B, the securing portion 124 is arranged to extend from the lower surface 1221 of the mounting portion 122. In other examples, the securing portion 124 may be arranged to extend from any position along the height of the mounting portion 122 (i.e., along the y-direction). For example, the securing portion 124 may extend from the middle of the height of the mounting portion 122 or from the upper surface 1122 of the mounting portion 122.

[0048] The securing portion 124 is configured to secure at least one light source 140, which may be at least one LED module. In the illustrated example of FIGs. 1A and 1B, three light sources 140 are shown, but any number of light sources 140 is envisaged. The at least one light source 140 is configured to provide area lighting, as depicted by the arrows extending from the light sources.

[0049] The securing portion 124 is configured to have a length which may extend along the x-direction, and a width which may extend along the z-direction (where the z-direction is perpendicular to the x- and y-directions). The at least one light source 140 may be positioned at any location along the width and length of the securing portion 124. The thickness of the securing portion 124 is depicted in FIGs. 1A and 1B along the y-direction. The thickness of the securing portion 124 may be (substantially) smaller than the width and the length of the securing portion 124.

[0050] The body 110 is configured to at least partially cover the securing portion 124, when the body 110 is connected to the mounting assembly 120 by the fixing arrangement 130. Although FIGs. 1A and 1B illustrate a side-view of the luminaire 100, the body 110 is configured to cover the securing portion 124 along the securing portion's width and length, for example along the x- and z-directions. In some examples, the body 110 may be configured to contact at least a portion of the securing portion 124 when the body 110 is connected to the mounting assembly 120.

[0051] In the illustrated examples of FIGs. 1A and 1B, the body 110 is configured to cover the majority of the top surface of the securing portion 124, even when the body 110 is deformed. In other examples, the body 110 may be configured to cover a portion of the securing portion 124.

[0052] The at least one light source 140 is configured to be secured to a first surface of the securing portion 124, illustrated in FIGs. 1A and 1B as the underside of the securing portion 124. The luminaire 100 is configured such that the body 110, when connected to the mounting assembly 120, covers a second surface (illustrated at the topside) of the securing portion 124. The first and second surfaces are separated by the thickness of the securing portion 124 (illustrated in the y-direction).

[0053] The illustrated example shows the luminaire 100 as being arranged to provide downward facing lighting. In other examples, the luminaire 100 may be arranged to provide lighting in a different direction. Similar to the illustrated example, in such example where lighting is provided in a different direction, the secured at least one light source 140 and the body 110 are separated by the thickness of the securing portion 124.

[0054] Although the illustrated examples of FIGs. 1A and 1B show the luminaire 100 in a cantilever manner, the mounting assembly 120 may be arranged in a different manner. For example, the body 110 may be arranged to at least partially cover the mounting portion 122. In some examples, the mounting portion 122 may comprise a lens. The lens may surround the at least one light source 140 in order to diffuse light emitted by the at least one light source 140. The luminaire 100 may be arranged as a bollard light, or a stacked light.

[0055] When the body 110 is connected to the mounting assembly 120 and the luminaire 100 is mounted by the mounting assembly 120, the body 110 may be arranged to cover an upper surface of the luminaire 100. In some examples, the body 110 may be arranged to cover, or at least partially cover, an outer perimeter of the luminaire 100, with the at least one light source 140 arranged within the outer perimeter of the luminaire 100. The luminaire 100 may, for example, be a bulkhead light.

[0056] FIG. 2 shows a side-view cross-section of the luminaire 100. The luminaire 100 comprises a body 110, a mounting assembly 120, a fixing arrangement 130 and at least one light source 140, which may all be as described above in relation to FIGs. 1A and 1B. The illustrated positioning of the fixing arrangement 130 of FIG. 2 is different than that illustrated in FIGs. 1A and 1B.

[0057] The luminaire 100 of FIG. 2 comprises a circuitry enclosure 150 configured to be secured to the securing portion 124 to form a cavity 152. The circuitry enclosure 150 may comprise a length and a width (along the x- and z-directions, respectively), which may be the same or smaller than the length and the width of the securing portion 124.

[0058] The cavity 152 is configured to house circuitry 160, which may be in the form of drivers such as LED drivers. The circuitry 160 is configured to supply power to the at least one light source 140, i.e., the three illustrated light sources 140. In some examples, the number of drivers housed by the cavity 152 is the same as the number of light sources 140 secured to the securing portion 124, such that each driver supplies power to a respective light source. In some examples, one driver housed by the cavity 152 may supply power to more than one light source 140. In some examples, more than one driver housed by the cavity 152 may supply power to one light source 140.

[0059] The circuitry enclosure 150 may be formed from one or more rigid materials, such as plastic and / or metal. The circuitry enclosure 150, when secured to the securing portion 124, may be configured to form a weatherproof seal for protecting the circuitry 160 housed by the cavity 152. In other words, the seal between the circuitry enclosure 150 and the securing portion 124, when secured together, may be configured to prevent water and / or dust ingress into the cavity 152 where the circuitry enclosure 150 contacts the securing portion 124.

[0060] The at least one light source 140 is configured to be secured to a first surface of the securing portion 124, illustrated in FIG. 2 as the underside of the securing portion 124. The circuitry enclosure 150 is configured to be secured to a second surface (illustrated as the topside) of the securing portion 124. The first and second surfaces are separated by a thickness of the securing portion 124. The illustrated example shows the luminaire 100 as being arranged to provide downward facing lighting. In other examples, the luminaire 100 may be arranged to provide lighting in a different direction. Similar to the illustrated example, in such example where lighting is provided in a different direction, the secured at least one light source 140 and the secured circuitry enclosure 150 are separated by the thickness of the securing portion 124.

[0061] As illustrated in FIG. 2, the body 110 is configured to at least partially cover the circuitry enclosure 150. In FIG. 2, the length (e.g., the dimension along the x-direction) of the body 110 is less than the length of the securing portion 124. In some examples, the body 110 may have a length which exceeds the length of the securing portion 124 (see for example FIGs. 4A and 4B). The body 110 may be configured to contact the securing portion 124 when the body 110 is connected to the mounting assembly 120.

[0062] The body 110 may be configured to provide the circuitry enclosure 150 protection against environmental conditions, such as protection against UV radiation, wind, precipitation and / or wildlife. The circuitry enclosure 150 may, therefore, be advantageously formed from a material, and / or have a thickness, which would otherwise be susceptible to such conditions. The circuitry enclosure 150 may be formed from a material such that water and dust ingress into the cavity 152 is prevented.

[0063] The mounting assembly 120 may comprise a discontinuity 126 configured to receive a cable 170 for supplying power to the at least one light source 140. In particular, the cable 170 is configured to supply power to the circuitry 160, which supplies power to the at least one light source 140. In the illustrated example, the mounting portion 122 is arranged to receive at least a portion of the cable 170. The cable 170 may be configured to extend through a structure which the luminaire 100 is mounted to, such as a lamppost. In some examples, the circuitry enclosure 150 may comprise a hole configured to receive at least a portion of the cable 170. The luminaire 100 may comprise a connector positioned at least partially in the hole of the circuitry enclosure 150. In some examples, the connector may be configured to receive at least a portion of the cable 170, for example the connector may be a cable gland. In other examples, the connector may be configured to mate with a corresponding connector attached to an end of the cable 170.

[0064] In the illustrated example of FIG. 2, the mounting assembly 120 comprises a fastening portion 128 (e.g., a fastening plate) configured to receive at least a portion of the fixing arrangement 130. The fastening portion 128 is orientated along the x-direction, and the fixing arrangement 130 is orientated along the y-direction. Generally, the fixing arrangement 130 may be orientated perpendicularly to the fastening portion 128 when the body 110 is connected to the mounting assembly 120, i.e., via the fastening portion 128. It is envisaged that alternative orientations for the fastening portion 128 and the fixing arrangement 130 are possible.

[0065] The fastening portion 128 may be fixedly attached to the mounting portion 122, as illustrated, or may be fixedly attached to the securing portion 124. In some examples, the mounting portion 122 and the fastening portion 128 may be integrally formed. In some examples, the securing portion 124 and the fastening portion 128 may be integrally formed. In some examples, the mounting portion 122, securing portion 124 and the fastening portion 128 may be integrally formed. In some examples, the circuitry enclosure 150 may comprise the fastening portion 128. In other words, the circuitry enclosure 150 and the fastening portion 128 may be integrally formed. The fastening portion 128 may be formed from one or more rigid materials, such as plastic and / or metal.

[0066] The body 110 and the fastening portion 128 are configured to receive at least a portion of the fixing arrangement 130 such that the fixing arrangement connects the body 110 and the mounting assembly 120. In some examples, the body 110 and the fastening portion 128 may comprise corresponding holes configured to receive a portion of the fixing arrangement 130. The fixing arrangement 130 may comprise mating parts such that, when mated, the body 110 and the mounting assembly 120 are (fixedly) connected. The fixing arrangement 130 may be configured to achieve a peak tightness, which may be determined by the fixing arrangement 130, which enables a degree of freedom of movement / deformation of the body 110 relative to the mounting assembly 120.

[0067] FIG. 3 shows a close-up view of an example fixing arrangement 130. The example illustrated in FIG. 3 may be the same fixing arrangement 130 as described above in relation to FIG. 2.

[0068] The illustrated fixing arrangement 130 comprises a fastener 210 (comprising a head 212 and an elongate shaft 214), a helical spring 220 (such as a compression spring), a washer 230, and a mating part 240. The fastener 210 and the mating part 240 are configured to be corresponding mating parts, such that when an end of the fastener 210 is received by the mating part 240, the fastener 210 and the mating part 240 are fixedly attached. In some examples, the fastener 210 may comprise a threaded portion configured to be received by a corresponding threaded portion of the mating part 240. The fastener 210 may be a screw or a bolt, and the mating part 240 may be a corresponding nut. In some examples, the fastener 210 may be a rivet and the mating part 240 may be a corresponding rivet nut. In some examples, the amount of the fastener 210 received by the mating part 240 may be restricted, i.e., the mating part 240 may receive a maximum amount of the fastener 210.

[0069] As illustrated in FIG. 3, the fastener 210 is configured to extend through the body 110 and the fastening portion 128, and an end of the fastener 210 is configured to be received by the mating part 240. In other words, the mating part 240 is configured to receive and engage with a portion of the fastener 210 through the fastening portion 128 such that the body 110 and the mounting assembly are connected.

[0070] The body 110 may comprise a connecting hole 112 and the fastener 210 may be configured to extend through the connecting hole 112. When the elongate shaft 214 is received by the connecting hole 112, a clearance may be provided between the elongate shaft 214 and the connecting hole 112. This therefore allows movement of the body 110, due to deformation of the body 110, in the perpendicular axes from the elongate shaft of the fastener 210 (i.e., in the x- and / or z-directions). In some examples, the connecting hole 112 may, in at least one direction, be (at least) 1.4 times wider than the fastener 210 (i.e., the elongate shaft 214 of the fastener 210). In some examples, the connecting hole 112 and the fastener 210 may have a circular cross-section, and the diameter of the connecting hole 112 is (at least) 1.4 times the diameter of the fastener 210 (i.e., the diameter of the elongate shaft 214 of the fastener 210).

[0071] In addition, the fastening portion 128 is configured to receive at least a portion of the fastener 210. In FIG. 3, the fastening portion 128 comprises a hole 129 and the fastener 210 is configured to extend through the hole 129 of the fastening portion 128 when the body 110 is connected to the mounting assembly 120. Therefore, the fastener 210 is configured to extend through the connecting hole 112 of the body 110 and the hole 129 of the fastening portion 128, and configured to be at least partially received by the mating part 240 when the fixing arrangement 130 connects the body 110 to the mounting assembly 120.

[0072] The body 110 may further comprise a depression 114 (e.g., a recess) such that a portion of the fastener 210, the helical spring 220 and the washer 230 are positioned in the depression 114 when the fixing arrangement 130 connects the body 110 to the mounting assembly 120 (i.e., to the fastening portion 128). In the illustrated example of FIG. 3, the connecting hole 112 is arranged to extend from within the depression 114. The depression 114 may therefore be configured to at least partially conceal a portion of the fixing arrangement 130. The dimensions of the depression 114, in the x- and z-directions, are arranged to be larger than the washer 230. In some examples, the washer 230 may be circular, and the depression 114 may have a diameter which is between 5 and 15 % larger than the diameter of the washer 230. In some examples, the diameter of the depression 114 may be 12 % larger than the diameter of the washer 230.

[0073] In FIG. 3, the fastener 210 is an elongate fastener comprising a head 212 and an elongate shaft 214, where the elongate shaft 214 extends from the head 212. The elongate shaft 214 is configured to extend through the body 110 and through the fastening portion 128, when the body 110 is connected to the mounting assembly. The end of the fastener 210 to be received by the mating part 240 is arranged at a distal end of the elongate shaft 214 from the head 212.

[0074] In some examples, the elongate shaft 214 of the fastener 210 may have a circular cross-section. The connecting hole 112 of the body 110 and the hole 129 of the fastening portion 128 may be circular. In other examples, the connecting hole 112 of the body 110 and the hole 129 of the fastening portion 128 may be slotted.

[0075] In the illustrated example of FIG. 3, the mating part 240 comprises a stop 242 which is configured to restrict the portion of the fastener 210 received by the mating part 240. Therefore, there is a maximum amount of the fastener 210 which the mating part 240 can receive. In other words, the fixing arrangement 130 is configured to achieve a peak tightness, as determined by the stop 242 of the mating part 240. In some examples, the stop 242 may be a partial closure at one end to prevent the fastener 210 from extending further through the mating part 240, as illustrated in FIG. 3. In this manner, the stop 242 may be a lip which restricts the amount of the fastener 210 received, or receivable, by the mating part 240. The mating part 240 may be a lock nut, such as a nut with a nylon insert. In some examples, the stop 242 may be a total closure at an end of the mating part 240. The stop 242 may be a cap, or a dome, such that the mating part 240 is a cap nut or a dome nut. The mating part 240 may be a blind nut.

[0076] In some examples, a portion of the mating part 240 may be received by the hole 129 of the fastening portion 128 when the body 110 is connected to the mounting assembly 120 by the fixing arrangement 130. The mating part 240 may be fixedly engaged (e.g., rotationally and / or axially) with the fastening portion 128 (i.e., the hole 129 of the fastening portion 128) when the body 110 is connected to the mounting assembly. The portion of the mating part 240 may be configured to form an interference fit when received by the hole 129 of the fastening portion 128. The mating part 240 may be expandable, such as an expanding nut, and may be configured to expand into the hole 129 of the fastening portion 128 when engaged with the portion of the fastener 210. In some examples, the mating part may be a rivet nut.

[0077] As illustrated in FIG. 3, the helical spring 220 is positioned between the head 212 of the fastener 210 and the washer 230. Therefore, the helical spring 220 is configured to impart the bias along an axis parallel to the elongate shaft 214 of the fastener 210, i.e., along the y-direction. This is because a portion of the fastener 210 is received by the helical spring 220 and the tension of the helical spring 220 is along the axis parallel to the elongate shaft 214 of the fastener 210, i.e., in the y-direction. When the body 110 is connected to the mounting assembly 120, i.e., the mating part 240 is engaged with the fastener 210, the helical spring 220 is at least partially compressed.

[0078] The helical spring 220 is arranged between the head 212 of the fastener 210 and the washer 230. The helical spring 220 is arranged to abut against a surface of the head 212. In particular, the helical spring 220 is arranged to abut against a surface of the head 212 from which the elongate shaft 214 extends from. The helical spring 220 is further arranged to abut against the washer 230, which is configured to spread the exerted load across an opening of a connecting hole 112 of the body 110. In some examples, the ends of the helical spring 220 are flat (e.g., ground, or squared ends). The ends of the helical spring 220 may comprise closed or open ends. It may be that the helical spring 220 comprises closed and ground ends, or closed and squared ends. In some examples, the helical spring 220 may comprise open and ground ends.

[0079] Although depicted as a helical spring 220, any form of spring configured to be at least partially compressible is envisaged. The spring used in the fixing arrangement 130 may be at least partially compressed when the body 110 is connected to the fastening portion 128. In some examples, the spring may be configured to receive at least a portion of the fastener 210 (e.g., a portion of the elongate shaft 214). For example, the spring may comprise a hole configured to receive at least a portion of the fastener 210. The spring may be one or more disc springs, one or more leaf springs, a volute spring, one or more flat springs, a gas spring, or an air spring. In some examples, the spring may be replaced with a bellow, e.g., a metal bellow, configured to be at least partially compressible.

[0080] In the illustrated example, the washer 230 is, in at least one direction (e.g., the x-direction), 2 times wider than the connecting hole 112. In some examples, the washer 230 may, in at least one direction, be more than 2 times as wide as the connecting hole 112. This therefore spreads the load exerted onto the washer 230 by the helical spring 220 across the body 110. This can advantageously reduce the amount of damage caused on the body 110. The size of the washer 230, in comparison to the size of the connecting hole 112, allows contact to be maintained with the body 110 when the body 110 deforms. In other words, even if the size of the connecting hole 112 changes over time (i.e., due to deformation of the body 110) the washer 230 maintains contact therefore maintaining the connection between the body 110 and the mounting assembly 120. In some examples, the connecting hole 112 and the washer 230 may have a circular cross-section, and the diameter of the washer 230 is 2 times the diameter of the connecting hole 112.

[0081] The helical spring 220 is configured to create the bias, which is configured to compensate for deformation of the body 210 to maintain a fastening force. The helical spring 220 is configured to urge at least a portion of the bias against the fastener 210, e.g., the head 212 of the fastener 210. The helical spring 220 is configured to urge at least a portion of the bias against the washer 230. The helical spring 220 may have a spring constant which is greater than, or equal to, 0.05 N / mm.

[0082] As illustrated in FIG. 3, the helical spring 220 comprises more than one turn (e.g., a plurality of turns) and is configured to receive at least a portion of the fastener 210 (e.g., a portion of the elongate shaft 214). When the body 110 is connected to the mounting assembly 120 (i.e., the fastening portion 128), a spacing is provided between the turns of the helical spring 220. In other words, the helical spring 220 may be partially compressed when the body 110 is connected to the mounting assembly 120, and not fully compressed. When at a peak tightness, the helical spring 220 is not coil bound, i.e., is able to deform bidirectionally. Therefore, when the body 110 is connected to the mounting assembly, the pitch between the turns of the helical spring 220 may be less than the pitch of the helical spring 220 in a relaxed state, i.e., when uncompressed. The spacing therefore allows, as the body 110 deforms, the washer 230 to move bidirectionally, in either direction along the y-direction (upwards or downwards). In other words, the compression of the helical spring 220 may be increased or decreased during deformation of the body 110. This therefore compensates for the (unpredictable) deformation of the body 110 to maintain the fastening force.

[0083] When the body 110 is connected to the mounting assembly by the fixing arrangement 130, the body 210 may contact the circuitry enclosure and / or the securing portion such that a gap 250 is present between the body 110 and the fastening portion 128. For example, there may be a gap 250 between the body 110 and the fastening portion 128 when the fixing arrangement 130 is at a peak tightness. The gap 250 is arranged to provide space for the body 110 to move into when deforming. This movement restricts the amount of stress exerted onto the fastening portion 128 during deformation, or the fastening portion 128 damaging the body 110, which would occur if the body 110 contacted the fastening portion 128.

[0084] The bias created by the helical spring 220 may be insufficient to move the fastening portion 128 closer to the body 110. In particular, the connection between the mating part 240 and the fastening portion 128, and the rigidity of the fastening portion 128, may be such that the bias created by the helical spring 220 is insufficient to move the fastening portion 128 closer to the body 110. Further, the body 110 may be arranged such that the bias created by the helical spring 220 is insufficient to move the body 110 closer to the fastening portion 128. This is explained in greater detail below in relation to FIGs. 4A and 4B. In some examples, the body 110 may be arranged to contact the circuitry enclosure 150 and / or the securing portion 124 such that the bias of the fixing arrangement 130 is insufficient to move the body 110 closer to the fastening portion 128. In other words, when the body 110 is connected to the mounting assembly 120, the gap 250 is maintained.

[0085] In some examples, the luminaire 100 may comprise a compression limiter (not illustrated). The compression limiter may be positioned between the body 110 and the fastening portion 128. The compression limiter may be configured to limit further tightening of the fixing arrangement 130 and enable a degree of freedom of movement / deformation of the body 110 when the fixing arrangement 130 is at a peak tightness as determined by the compression limiter. The compression limiter may be a hollow sleeve of material having a higher Young's modulus than the material forming the body 110. The compression limiter may therefore prevent the fastener 210 from damaging (e.g., crushing) the body 110.

[0086] Although the compression limiter is not illustrated in FIG. 3, the compression limiter would be arranged to abut against the washer 130 and against the fastening portion 128, i.e., be positioned at least partially inside the connecting hole 112. In particular, the compression limiter would abut against an underside of the washer 230 (i.e., the side of the washer 230 abutting against the body 110 in FIG. 3) and abut against an upper side of the fastening portion 128 (i.e., the surface of the fastening portion 128 closest to the body 110). The compression limiter may therefore ensure that the gap 150 between the fastening portion 128 and the body 110 is maintained. The length of the compression limiter is therefore equal to the distance between the underside of the washer 230 and the upper side of the fastening portion 128 (i.e., the combination of the length of the connecting hole 112 and the gap 250). The internal diameter of the compression limiter may be such that a clearance is provided between the inside of the compression limiter and the elongate shaft 214 of the fastener 210. For example, the internal diameter of the compression limiter may, in at least one direction, be between 1.4 and 2 times wider than the fastener 210 (i.e., the elongate shaft 214 of the fastener 210).

[0087] The fixing arrangement 130 is illustrated in a particular order in FIG. 3. However, it is envisaged that the components of the fixing arrangement 130 may be in a different order. For example, the head 212 of the fastener 210 may be arranged to engage with the fastening portion 128, and the mating part 240 may be arranged to engage with the body 210. The helical spring 220, or an additional helical spring, may be positioned between the head 212 of the fastener 210 and the fastening portion 128, or between the mating part 240 and the fastening portion 128. In some examples, the helical spring 220, or an additional helical spring, may be positioned between the body 210 and the fastening portion 128, i.e., in the gap 250.

[0088] FIG. 4A shows a side-view cross-section, and FIG. 4B shows a cross-section view towards the front, of the luminaire 100. The luminaire 100 is similar to the luminaires discussed above in relation to FIGs. 1 to 3. The fixing arrangement 130, and the connection between the body 110 and the fastening portion 128, are the same as described above in relation to FIG. 3.

[0089] In the illustrated examples of FIGs. 4A and 4B, the securing portion 124 and the fastening portion 128 are integrally formed. The integrally formed securing portion 124 and fastening portion 128 are fixedly connected to the mounting portion 122. The discontinuity 126 configured to receive the cable may be through the integrally formed securing portion 124 and fastening portion 128, and through the mounting portion 122 as illustrated in FIG. 4A. The cable extending through the discontinuity 126 may be received by a connector 310, such as a cable gland, at least partially positioned in the circuitry enclosure 150. The connector 310 may therefore be configured to receive a portion of the cable to allow the cable to supply power to circuitry 160 housed inside the circuitry enclosure 150. In some examples, the connector 310 may be configured to form a waterproof seal in order to prevent water ingress into the circuitry enclosure 150.

[0090] The mounting portion 122, as illustrated in FIG. 4A, may comprise a plurality of holes for mounting the luminaire 100. For example, each of the plurality of holes may be configured to receive a fastener, such as a screw, for mounting the luminaire 100.

[0091] The luminaire 100 of FIGs. 4A and 4B comprises a sensor device 320. The body 110 and the circuitry enclosure 150 each comprise a hole arranged to receive at least a portion of the sensor device 320. As illustrated in FIGs. 4A and 4B, the sensor device 320 may protrude from the body 110 when the sensor device 320 is received by the body 110 and the circuitry enclosure 150.

[0092] The sensor device 320 may be configured to detect ambient light levels. In particular, the sensor device 320 may comprise a light sensor, such as a photocell. The luminaire 100 may be configured to illuminate an area of interest when the light level sensed by the sensor device 320 is below a threshold. The sensor device 320 may comprise a communication interface. For example, the communication interface may comprise a transmitter and / or a transceiver. The sensor device 320 may be configured to communicate with a timer and / or with a central management system. The timer may be used to determine when and for how long the luminaire 100 is to provide area lighting. In some examples, the luminaire 100 may comprise the timer, for example housed in the cavity 152. In some examples, the timer may be an external timer, i.e., a timer external to the luminaire 100. The central management system may be configured to provide remote, dynamic control of the luminaire 100. For example, the luminaire 100 may receive instructions (e.g., the illumination time) from the central management system via the sensor device 320, e.g., via the communication interface.

[0093] The sensor device 320 may be configured to communicate with an external user device, for example using short-range communication, such as near field communication (NFC) and / or Bluetooth (RTM). It may be that the luminaire 100 is configured to communicate with the external user device via a transceiver of the sensor device 320. The external user device may provide instructions to the luminaire 100. For example, the instructions may include to use and / or not use a particular driving circuitry and / or light.

[0094] In the illustrated example, the circuitry enclosure 150 includes a protruding portion 154 which is arranged to receive at least a portion of the sensor device 320. In FIGs. 4A and 4B, the protruding portion 154 extends along the (positive) y-direction. The protruding portion 154 comprises the hole in the circuitry enclosure 150 for receiving the portion of the sensor device 320.

[0095] In FIGs. 4A and 4B, the body 110 comprises a corresponding hole configured to receive at least a portion of the sensor device 320. In particular, the corresponding hole of the body 110 is configured to receive at least a portion of the protruding portion 154. When the body 110 is connected to the mounting assembly 120 (i.e., the fastening portion 128), the protruding portion 154 of the circuitry enclosure 150 is at least partially received by the corresponding hole of the body 110.

[0096] In some examples, the body 110 may be configured to abut against the protruding portion 154. The body 110 may be configured to form an interference fit with the protruding portion 154, when the body 110 is connected to the mounting assembly 120. Therefore, there may be no clearance between the body 110 and the protruding portion 154 when the protruding portion 154 is received by the corresponding hole of the body 110. For example, the circuitry enclosure 150 may be formed from a material having a higher Young's modulus than the material forming the body 110. The circuitry enclosure 150 may be formed from a harder material than the material forming the body 110. Therefore, the body 110 around the corresponding hole may at least partially deform when receiving the protruding portion 154.

[0097] In some examples, the body 110 may be configured to form a transition fit (such as a push fit) with the protruding portion 154. This results in a minimal clearance between the body 110 and the protruding portion 154 when the protruding portion 154 is received by the corresponding hole of the body 110. In some examples, the transition fit may provide a small clearance between the body 110 and the protruding portion 154 when the protruding portion 154 is received by the corresponding hole of the body 110. This therefore allows a small amount of movement of the body 110 (due to deformation) relative to the protruding portion 154.

[0098] In some examples, the body 110 may be configured to form a clearance fit (such as a slide fit) with the protruding portion 154. The clearance fit may provide a clearance between the body 110 and the protruding portion 154 when the protruding portion 154 is received by the corresponding hole of the body 110. This therefore allows movement of the body 110 (due to deformation) relative to the protruding portion 154.

[0099] When the body 110 forms an interference fit, or a transition fit with a minimal clearance, with the protruding portion 154, the contact between the body 110 and the protruding portion 154 acts against the bias of the fixing arrangement 130. This is because the fit is configured to maintain the body 110 in position with regards to the protruding portion 154. The bias created by the helical spring 220 (as described above in relation to FIG. 3) is insufficient to overcome this contact between the body 110 and the protruding portion 154. The compression of the helical spring 220, and the position of the body 110 in relation to the mounting assembly 120, is therefore maintained. In particular, the gap 250 between the body 110 and the fastening portion 128 is maintained.

[0100] If the body 110 deforms such that the contact with the protruding portion 154 is altered, the compression of the helical spring 220 (FIG. 3) may increase or decrease. The change in compression of the helical spring 220 may result in the gap 250 (FIG. 3) between the body 110 and the fastening portion 128 increasing or decreasing. The fixing arrangement 130 therefore compensates for deformation of the body 110 while maintaining a fastening force, i.e., the body 110 is still connected to the mounting assembly 120.

[0101] In addition to the contact between the body 110 and the protruding portion 154, the body 110 may contact the circuitry enclosure 150 elsewhere. For example, FIG. 4A illustrates the body 110 contacting the circuitry enclosure 150 at a front of the luminaire 100 (i.e., at the rightmost surface of the illustrated circuitry enclosure 150). This contact between the body 110 and the circuitry enclosure 150 is configured to act against the bias of the fixing arrangement 130. In some examples, this contact may in alternative to the contact between the body 110 and the protruding portion 154.

[0102] Additionally, or alternatively, the body 110 may contact the securing portion 124, as illustrated in FIG. 4A, for example at the distal end of the securing portion 124 (i.e., at the rightmost edge of the illustrated securing portion 124). The bias created by the helical spring 220 (as described above in relation to FIG. 3) is insufficient to overcome the contact between the body 110 and the circuitry enclosure 150, and / or the contact between the body 110 and the securing portion 124. The compression of the helical spring 220, and the position of the body 110 in relation to the mounting assembly 120, is therefore maintained. Such contact / contacts may be arranged when the body 110 forms an interference fit, transition fit, or clearance fit with the protruding portion 154 when the body 110 is connected to the mounting assembly 120.

[0103] Deformation of the body 110 at the point of contact between the body 110 and the circuitry enclosure 150, and / or the securing portion 124, may result in the compression of the helical spring 220 to increase or decrease. The change in compression of the helical spring 220 may result in the gap 250 between the body 110 and the fastening portion 128 increasing or decreasing. The fixing arrangement 130 therefore compensates for deformation of the body 110 while maintaining a fastening force, i.e., the body 110 is still connected to the mounting assembly 120.

[0104] The circuitry enclosure 150 may comprise a plurality of extensions 156 (e.g., flanges). Each extension 156 is configured to receive a fastener to secure the circuitry enclosure 150 to the securing portion 124. As illustrated in FIG. 4A and 4B, the plurality of extensions 156 are arranged such that, when secured to the securing portion 124, each extension 156 is positioned towards the edge of the securing portion 124. In particular, each extension 156 is positioned away from the at least one light source 140.

[0105] In FIGs. 4A and 4B, the body 110 comprises a sloped upper surface 116 configured to divert water runoff. In other words, when the luminaire 100 is used for outdoor lighting, precipitation may fall onto the body 110, and the sloped upper surface 116 is configured to direct water runoff. As illustrated in FIGs. 4A and 4B, the body 110 may therefore comprise the sloped upper surface 116 along the sides (illustrated in FIG. 4B) and the front (illustrated in FIG. 4A) of the body 110. Although illustrated as comprising a flat portion, the body 110 may be configured such that the top surface of the body 110 is also sloped in order to divert water runoff.

[0106] A portion of a bottom surface 118 of the body 110 may be arranged such that it is positioned at the same level as, or beyond, the securing portion 124, when the body is connected to the mounting assembly. In some examples, as illustrated in FIG. 4A and 4B, the bottom surface 118 of the body 110 may be configured to extend to or beyond the at least one light source 140. In other words, the thickness of the body 110 (i.e., the dimension of the body 110 illustrated in the y-direction) may be greater than the height of the circuitry enclosure (i.e., in the y-direction, to an upper surface of the protruding portion 154) combined with the thickness of the securing portion 124. This may therefore ensure that water runoff is away from the at least one light source 140.

[0107] Where a structural feature has been described, it may be replaced by means for performing one or more of the functions of the structural feature whether that function or those functions are explicitly or implicitly described.

[0108] The term 'comprise' is used in this document with an inclusive not an exclusive meaning. That is any reference to X comprising Y indicates that X may comprise only one Y or may comprise more than one Y. If it is intended to use 'comprise' with an exclusive meaning then it will be made clear in the context by referring to "comprising only one..." or by using "consisting".

[0109] In this description, the wording 'connect' and 'communication' and their derivatives mean operationally connected / in communication. It should be appreciated that any number or combination of intervening components can exist (including no intervening components), i.e., so as to provide direct or indirect connection / communication. Any such intervening components can include hardware and / or software components.

[0110] As used herein, the term "determine / determining" (and grammatical variants thereof) can include, not least: calculating, computing, processing, deriving, measuring, investigating, identifying, looking up (for example, looking up in a table, a database or another data structure), ascertaining and the like. Also, "determining" can include receiving (for example, receiving information), accessing (for example, accessing data in a memory), obtaining and the like. Also, " determine / determining" can include resolving, selecting, choosing, establishing, and the like.

[0111] In this description, reference has been made to various examples. The description of features or functions in relation to an example indicates that those features or functions are present in that example. The use of the term 'example' or 'for example' or 'can' or 'may' in the text denotes, whether explicitly stated or not, that such features or functions are present in at least the described example, whether described as an example or not, and that they can be, but are not necessarily, present in some of or all other examples. Thus 'example', 'for example', 'can' or 'may' refers to a particular instance in a class of examples. A property of the instance can be a property of only that instance or a property of the class or a property of a subclass of the class that includes some but not all of the instances in the class. It is therefore implicitly disclosed that a feature described with reference to one example but not with reference to another example, can where possible be used in that other example as part of a working combination but does not necessarily have to be used in that other example.

[0112] Although examples have been described in the preceding paragraphs with reference to various examples, it should be appreciated that modifications to the examples given can be made without departing from the scope of the claims.

[0113] Features described in the preceding description may be used in combinations other than the combinations explicitly described above.

[0114] Although functions have been described with reference to certain features, those functions may be performable by other features whether described or not.

[0115] Although features have been described with reference to certain examples, those features may also be present in other examples whether described or not.

[0116] The term 'a', 'an' or `the' is used in this document with an inclusive not an exclusive meaning. That is any reference to X comprising a / an / the Y indicates that X may comprise only one Y or may comprise more than one Y unless the context clearly indicates the contrary. If it is intended to use 'a', 'an' or `the' with an exclusive meaning then it will be made clear in the context. In some circumstances the use of 'at least one' or 'one or more' may be used to emphasis an inclusive meaning but the absence of these terms should not be taken to infer any exclusive meaning.

[0117] The presence of a feature (or combination of features) in a claim is a reference to that feature or (combination of features) itself and also to features that achieve substantially the same technical effect (equivalent features). The equivalent features include, for example, features that are variants and achieve substantially the same result in substantially the same way. The equivalent features include, for example, features that perform substantially the same function, in substantially the same way to achieve substantially the same result.

[0118] In this description, reference has been made to various examples using adjectives or adjectival phrases to describe characteristics of the examples. Such a description of a characteristic in relation to an example indicates that the characteristic is present in some examples exactly as described and is present in other examples substantially as described.

[0119] The above description describes some examples of the present disclosure however those of ordinary skill in the art will be aware of possible alternative structures and method features which offer equivalent functionality to the specific examples of such structures and features described herein above and which for the sake of brevity and clarity have been omitted from the above description. Nonetheless, the above description should be read as implicitly including reference to such alternative structures and method features which provide equivalent functionality unless such alternative structures or method features are explicitly excluded in the above description of the examples of the present disclosure.

[0120] Whilst endeavoring in the foregoing specification to draw attention to those features believed to be of importance it should be understood that the Applicant may seek protection via the claims in respect of any patentable feature or combination of features hereinbefore referred to and / or shown in the drawings whether or not emphasis has been placed thereon.

Examples

Embodiment Construction

[0040]Some examples will now be described with reference to the accompanying drawings in which:

FIG. 1A shows a schematic diagram of an example of a luminaire with a cover; FIG. 1B shows a schematic diagram of the luminaire with the cover being deformed; FIG. 2 shows a side-view cross-section of the luminaire; FIG. 3 shows a close-up view of an example fixing arrangement; FIG. 4A shows a side-view cross-section of the luminaire; and FIG. 4B shows a cross-section view of the luminaire.

[0041]The figures are not necessarily to scale. Certain features and views of the figures can be shown schematically or exaggerated in scale in the interest of clarity and conciseness. For example, the dimensions of some elements in the figures can be exaggerated relative to other elements to aid explication. Similar reference numerals are used in the figures to designate similar features. For clarity, all reference numerals are not necessarily displayed in all figures.

DETAILED DESCRIPTION

[0042]Embodim...

TECHNOLOGICAL FIELD

[0001] Examples of the present disclosure relate to a luminaire for exterior lighting.BACKGROUND

[0002] Luminaires are used to provide exterior lighting, such as for streets, tunnels, or public access.BRIEF SUMMARY

[0003] According to various, but not necessarily all, examples there is provided a luminaire for exterior lighting. The luminaire comprises a mounting assembly comprising a securing portion, wherein the securing portion is configured to secure at least one light source; a body configured to at least partially cover the securing portion, wherein the body comprises a hygroscopic material; and a fixing arrangement configured to connect the body to the mounting assembly, wherein the fixing arrangement comprises a bias configured to compensate for deformation of the body to maintain a fastening force.

[0004] The body may be made from wood.

[0005] The fixing arrangement may comprise a fastener configured to extend through a connecting hole in the body.

[0006] In at least one direction, a clearance may be provided between the connecting hole in the body and the fastener.

[0007] In at least one direction, the connecting hole in the body may be at least 1.4 times wider than the fastener.

[0008] The fixing arrangement may comprise a spring configured to create the bias.

[0009] The spring may be a helical spring comprising more than one turn.

[0010] The fastener may comprise a head and the spring may be configured to urge at least a portion of the bias against the head of the fastener.

[0011] The spring may comprise closed ends.

[0012] When the body is connected to the mounting assembly, a spacing may be provided between turns of the spring.

[0013] The fastener may comprise an elongate shaft, and the bias may be imparted along an axis parallel to the elongate shaft of the fastener. In at least one direction, a clearance may be provided between the elongate shaft of the fastener and the connecting hole in the body.

[0014] The mounting assembly may comprise a fastening portion configured to receive at least a portion of the fastener.

[0015] The fixing arrangement may comprise a mating part configured to receive and engage with a portion of the fastener through the fastening portion such that the body and the mounting assembly are connected.

[0016] The mating part may comprise a stop configured to restrict the portion of the fastener received by the mating part.

[0017] The luminaire may comprise a compression limiter configured to limit further tightening of the fixing arrangement and enable a degree of freedom of movement of the body when the fixing arrangement is at a peak tightness as determined by the compression limiter.

[0018] The luminaire may comprise a circuitry enclosure configured to be secured to the securing portion to form a cavity. The body may be configured to at least partially cover the circuitry enclosure.

[0019] The cavity may be configured to house circuitry configured to supply power to the at least one light source.

[0020] The at least one light source may be configured to be secured to a first surface of the securing portion. The circuitry enclosure may be configured to be secured to a second surface of the securing portion. The first and second surfaces may be separated by a thickness of the securing portion.

[0021] The circuitry enclosure may comprise a hole configured to receive at least a portion of a sensor device. The body may comprise a corresponding hole configured to receive at least a portion of the sensor device.

[0022] The luminaire may comprise the sensor device. The sensor device may be configured to make electrical contact with circuitry housed by the circuitry enclosure through the hole in the circuitry enclosure and the corresponding hole in the body.

[0023] The mounting assembly may comprise a mounting portion configured to mount the luminaire such that, when the luminaire is mounted, the luminaire is mounted in a cantilever manner.

[0024] The mounting assembly may comprise a discontinuity configured to receive a cable for supplying power to the at least one light source.

[0025] The body may comprise a sloped upper surface to divert water runoff.

[0026] When the body is connected to the mounting assembly, at least a portion of a bottom surface of the body may be arranged to extend to or beyond the securing portion.

[0027] According to various, but not necessarily all, examples there is provided a luminaire for exterior lighting. The luminaire comprises a mounting assembly comprising a securing portion, wherein the securing portion is configured to secure at least one light source; a body configured to at least partially cover the securing portion; and a fixing arrangement configured to connect the body to the mounting assembly, wherein the fixing arrangement comprises a bias configured to compensate for deformation of the body to maintain a fastening force.

[0028] According to various, but not necessarily all, examples there is provided a luminaire for exterior lighting. The luminaire comprises a mounting assembly comprising a securing portion, wherein the securing portion is configured to secure at least one light source; a circuitry enclosure configured to be secured to the securing portion to form a cavity; and a body configured to at least partially cover the circuitry enclosure, wherein the body comprises a hygroscopic material.

[0029] The body may be made from wood.

[0030] The cavity may be configured to house circuitry configured to supply power to the at least one light source.

[0031] The at least one light source may be configured to be secured to a first surface of the securing portion. The circuitry enclosure may be configured to be secured to a second surface of the securing portion. The first and second surfaces may be separated by a thickness of the securing portion.

[0032] The circuitry enclosure may comprise a hole configured to receive at least a portion of a sensor device. The body may comprise a corresponding hole configured to receive at least a portion of the sensor device.

[0033] The luminaire may comprise the sensor device. The sensor device may be configured to make electrical contact with circuitry housed by the circuitry enclosure through the hole in the circuitry enclosure and the corresponding hole in the body.

[0034] The mounting assembly may comprise a mounting portion configured to mount the luminaire such that, when the luminaire is mounted, the luminaire is mounted in a cantilever manner.

[0035] The mounting assembly may comprise a discontinuity configured to receive a cable for supplying power to the at least one light source.

[0036] The body may comprise a sloped upper surface to divert water runoff.

[0037] When the body is connected to the mounting assembly, at least a portion of a bottom surface of the body may be arranged to extend to or beyond the securing portion.

[0038] According to various, but not necessarily all, examples there is provided examples as claimed in the appended claims.

[0039] While the above examples of the disclosure and optional features are described separately, it is to be understood that their provision in all possible combinations and permutations is contained within the disclosure. It is to be understood that various examples of the disclosure can comprise any or all of the features described in respect of other examples of the disclosure, and vice versa. Also, it is to be appreciated that any one or more or all of the features, in any combination, may be implemented by / comprised in / performable by an apparatus, a method, and / or computer program instructions as desired, and as appropriate.BRIEF DESCRIPTION

[0040] Some examples will now be described with reference to the accompanying drawings in which: FIG. 1A shows a schematic diagram of an example of a luminaire with a cover; FIG. 1B shows a schematic diagram of the luminaire with the cover being deformed; FIG. 2 shows a side-view cross-section of the luminaire; FIG. 3 shows a close-up view of an example fixing arrangement; FIG. 4A shows a side-view cross-section of the luminaire; and FIG. 4B shows a cross-section view of the luminaire.

[0041] The figures are not necessarily to scale. Certain features and views of the figures can be shown schematically or exaggerated in scale in the interest of clarity and conciseness. For example, the dimensions of some elements in the figures can be exaggerated relative to other elements to aid explication. Similar reference numerals are used in the figures to designate similar features. For clarity, all reference numerals are not necessarily displayed in all figures.DETAILED DESCRIPTION

[0042] Embodiments of the present disclosure relate to a luminaire.

[0043] FIGs. 1A and 1B show a side-view of an example of a luminaire 100, where the luminaire 100 is for exterior lighting, such as for area lighting. The luminaire 100 comprises a body 110, in the form of a cover. FIGs. 1A and 1B are the same except FIG. 1A shows the body 110 before it has deformed, whereas FIG. 1B shows the body 110 after deformation. The deformation may occur over time. The body 110 may comprise a hygroscopic material, such as wood, which over time deforms when subjected to ambient conditions. For example, the body 110 may absorb moisture from the air which causes the body 110 to deform over time, such as warp, twist or split. In other words, the shape of the body 110 may change over time. In some examples, the body 110 is made from wood. Although depicted as being rectangular in shape, the body 110 may be of any shape.

[0044] The luminaire 100 comprises a mounting assembly 120 and a fixing arrangement 130. The fixing arrangement 130 is configured to connect the body 110 to the mounting assembly 120. In particular, the fixing arrangement 130 is configured to maintain the connection between the body 110 and the mounting assembly 120 even when the body 110 has deformed, as shown in FIG. 1B. The fixing arrangement 130 comprises a bias configured to compensate for deformation of the body 110 to maintain a fastening force. An example of the fixing arrangement 130 is discussed below in relation to FIG. 3. In the illustrated examples of FIGs. 1A and 1B, the fixing arrangement 130 is shown in a particular direction (i.e., along the longitudinal direction of the luminaire 100, which is parallel to the x-direction), but it is envisaged that the fixing arrangement may be positioned in any direction when connecting the body 110 and the mounting assembly 120. In particular, the luminaire 100 is arranged in a cantilever manner, and the fixing arrangement 130 is shown parallel to the cantilever direction of the luminaire 100.

[0045] The mounting assembly 120 comprises a mounting portion 122 (for example a mounting bracket) and a securing portion 124 (for example a securing plate). In some examples, the mounting portion 122 may be fixedly attached to the securing portion 124, or the mounting portion 122 and the securing portion 124 may be integrally formed. The mounting portion 122 and / or the securing portion 124 may be formed from one or more rigid materials, such as plastic and / or metal. The body 110 and the securing portion 124 are individually / separately supported by the mounting portion 122.

[0046] The mounting portion 122 is configured to mount the luminaire 100, for example to a lamppost. In some examples, such as in FIGs. 1A and 1B, the mounting portion 122 is arranged such that the luminaire 100 is mounted, or mountable, in a cantilever manner. The mounting portion 122 may form a first part of a cantilever, and the body 110 may form a second part of the cantilever. The mounting portion 122 may be a bracket arm. The mounting assembly 120 may be arranged such that the luminaire 100, and specifically the at least one light source 140, is cantilevered from the lamppost, for example.

[0047] The mounting portion 122 has a height which is parallel to the y-direction. The height of the mounting portion 122 separates a lower surface 1221 and an upper surface 1122. As illustrated in FIGs. 1A and 1B, the securing portion 124 is arranged to extend from the lower surface 1221 of the mounting portion 122. In other examples, the securing portion 124 may be arranged to extend from any position along the height of the mounting portion 122 (i.e., along the y-direction). For example, the securing portion 124 may extend from the middle of the height of the mounting portion 122 or from the upper surface 1122 of the mounting portion 122.

[0048] The securing portion 124 is configured to secure at least one light source 140, which may be at least one LED module. In the illustrated example of FIGs. 1A and 1B, three light sources 140 are shown, but any number of light sources 140 is envisaged. The at least one light source 140 is configured to provide area lighting, as depicted by the arrows extending from the light sources.

[0049] The securing portion 124 is configured to have a length which may extend along the x-direction, and a width which may extend along the z-direction (where the z-direction is perpendicular to the x- and y-directions). The at least one light source 140 may be positioned at any location along the width and length of the securing portion 124. The thickness of the securing portion 124 is depicted in FIGs. 1A and 1B along the y-direction. The thickness of the securing portion 124 may be (substantially) smaller than the width and the length of the securing portion 124.

[0050] The body 110 is configured to at least partially cover the securing portion 124, when the body 110 is connected to the mounting assembly 120 by the fixing arrangement 130. Although FIGs. 1A and 1B illustrate a side-view of the luminaire 100, the body 110 is configured to cover the securing portion 124 along the securing portion's width and length, for example along the x- and z-directions. In some examples, the body 110 may be configured to contact at least a portion of the securing portion 124 when the body 110 is connected to the mounting assembly 120.

[0051] In the illustrated examples of FIGs. 1A and 1B, the body 110 is configured to cover the majority of the top surface of the securing portion 124, even when the body 110 is deformed. In other examples, the body 110 may be configured to cover a portion of the securing portion 124.

[0052] The at least one light source 140 is configured to be secured to a first surface of the securing portion 124, illustrated in FIGs. 1A and 1B as the underside of the securing portion 124. The luminaire 100 is configured such that the body 110, when connected to the mounting assembly 120, covers a second surface (illustrated at the topside) of the securing portion 124. The first and second surfaces are separated by the thickness of the securing portion 124 (illustrated in the y-direction).

[0053] The illustrated example shows the luminaire 100 as being arranged to provide downward facing lighting. In other examples, the luminaire 100 may be arranged to provide lighting in a different direction. Similar to the illustrated example, in such example where lighting is provided in a different direction, the secured at least one light source 140 and the body 110 are separated by the thickness of the securing portion 124.

[0054] Although the illustrated examples of FIGs. 1A and 1B show the luminaire 100 in a cantilever manner, the mounting assembly 120 may be arranged in a different manner. For example, the body 110 may be arranged to at least partially cover the mounting portion 122. In some examples, the mounting portion 122 may comprise a lens. The lens may surround the at least one light source 140 in order to diffuse light emitted by the at least one light source 140. The luminaire 100 may be arranged as a bollard light, or a stacked light.

[0055] When the body 110 is connected to the mounting assembly 120 and the luminaire 100 is mounted by the mounting assembly 120, the body 110 may be arranged to cover an upper surface of the luminaire 100. In some examples, the body 110 may be arranged to cover, or at least partially cover, an outer perimeter of the luminaire 100, with the at least one light source 140 arranged within the outer perimeter of the luminaire 100. The luminaire 100 may, for example, be a bulkhead light.

[0056] FIG. 2 shows a side-view cross-section of the luminaire 100. The luminaire 100 comprises a body 110, a mounting assembly 120, a fixing arrangement 130 and at least one light source 140, which may all be as described above in relation to FIGs. 1A and 1B. The illustrated positioning of the fixing arrangement 130 of FIG. 2 is different than that illustrated in FIGs. 1A and 1B.

[0057] The luminaire 100 of FIG. 2 comprises a circuitry enclosure 150 configured to be secured to the securing portion 124 to form a cavity 152. The circuitry enclosure 150 may comprise a length and a width (along the x- and z-directions, respectively), which may be the same or smaller than the length and the width of the securing portion 124.

[0058] The cavity 152 is configured to house circuitry 160, which may be in the form of drivers such as LED drivers. The circuitry 160 is configured to supply power to the at least one light source 140, i.e., the three illustrated light sources 140. In some examples, the number of drivers housed by the cavity 152 is the same as the number of light sources 140 secured to the securing portion 124, such that each driver supplies power to a respective light source. In some examples, one driver housed by the cavity 152 may supply power to more than one light source 140. In some examples, more than one driver housed by the cavity 152 may supply power to one light source 140.

[0059] The circuitry enclosure 150 may be formed from one or more rigid materials, such as plastic and / or metal. The circuitry enclosure 150, when secured to the securing portion 124, may be configured to form a weatherproof seal for protecting the circuitry 160 housed by the cavity 152. In other words, the seal between the circuitry enclosure 150 and the securing portion 124, when secured together, may be configured to prevent water and / or dust ingress into the cavity 152 where the circuitry enclosure 150 contacts the securing portion 124.

[0060] The at least one light source 140 is configured to be secured to a first surface of the securing portion 124, illustrated in FIG. 2 as the underside of the securing portion 124. The circuitry enclosure 150 is configured to be secured to a second surface (illustrated as the topside) of the securing portion 124. The first and second surfaces are separated by a thickness of the securing portion 124. The illustrated example shows the luminaire 100 as being arranged to provide downward facing lighting. In other examples, the luminaire 100 may be arranged to provide lighting in a different direction. Similar to the illustrated example, in such example where lighting is provided in a different direction, the secured at least one light source 140 and the secured circuitry enclosure 150 are separated by the thickness of the securing portion 124.

[0061] As illustrated in FIG. 2, the body 110 is configured to at least partially cover the circuitry enclosure 150. In FIG. 2, the length (e.g., the dimension along the x-direction) of the body 110 is less than the length of the securing portion 124. In some examples, the body 110 may have a length which exceeds the length of the securing portion 124 (see for example FIGs. 4A and 4B). The body 110 may be configured to contact the securing portion 124 when the body 110 is connected to the mounting assembly 120.

[0062] The body 110 may be configured to provide the circuitry enclosure 150 protection against environmental conditions, such as protection against UV radiation, wind, precipitation and / or wildlife. The circuitry enclosure 150 may, therefore, be advantageously formed from a material, and / or have a thickness, which would otherwise be susceptible to such conditions. The circuitry enclosure 150 may be formed from a material such that water and dust ingress into the cavity 152 is prevented.

[0063] The mounting assembly 120 may comprise a discontinuity 126 configured to receive a cable 170 for supplying power to the at least one light source 140. In particular, the cable 170 is configured to supply power to the circuitry 160, which supplies power to the at least one light source 140. In the illustrated example, the mounting portion 122 is arranged to receive at least a portion of the cable 170. The cable 170 may be configured to extend through a structure which the luminaire 100 is mounted to, such as a lamppost. In some examples, the circuitry enclosure 150 may comprise a hole configured to receive at least a portion of the cable 170. The luminaire 100 may comprise a connector positioned at least partially in the hole of the circuitry enclosure 150. In some examples, the connector may be configured to receive at least a portion of the cable 170, for example the connector may be a cable gland. In other examples, the connector may be configured to mate with a corresponding connector attached to an end of the cable 170.

[0064] In the illustrated example of FIG. 2, the mounting assembly 120 comprises a fastening portion 128 (e.g., a fastening plate) configured to receive at least a portion of the fixing arrangement 130. The fastening portion 128 is orientated along the x-direction, and the fixing arrangement 130 is orientated along the y-direction. Generally, the fixing arrangement 130 may be orientated perpendicularly to the fastening portion 128 when the body 110 is connected to the mounting assembly 120, i.e., via the fastening portion 128. It is envisaged that alternative orientations for the fastening portion 128 and the fixing arrangement 130 are possible.

[0065] The fastening portion 128 may be fixedly attached to the mounting portion 122, as illustrated, or may be fixedly attached to the securing portion 124. In some examples, the mounting portion 122 and the fastening portion 128 may be integrally formed. In some examples, the securing portion 124 and the fastening portion 128 may be integrally formed. In some examples, the mounting portion 122, securing portion 124 and the fastening portion 128 may be integrally formed. In some examples, the circuitry enclosure 150 may comprise the fastening portion 128. In other words, the circuitry enclosure 150 and the fastening portion 128 may be integrally formed. The fastening portion 128 may be formed from one or more rigid materials, such as plastic and / or metal.

[0066] The body 110 and the fastening portion 128 are configured to receive at least a portion of the fixing arrangement 130 such that the fixing arrangement connects the body 110 and the mounting assembly 120. In some examples, the body 110 and the fastening portion 128 may comprise corresponding holes configured to receive a portion of the fixing arrangement 130. The fixing arrangement 130 may comprise mating parts such that, when mated, the body 110 and the mounting assembly 120 are (fixedly) connected. The fixing arrangement 130 may be configured to achieve a peak tightness, which may be determined by the fixing arrangement 130, which enables a degree of freedom of movement / deformation of the body 110 relative to the mounting assembly 120.

[0067] FIG. 3 shows a close-up view of an example fixing arrangement 130. The example illustrated in FIG. 3 may be the same fixing arrangement 130 as described above in relation to FIG. 2.

[0068] The illustrated fixing arrangement 130 comprises a fastener 210 (comprising a head 212 and an elongate shaft 214), a helical spring 220 (such as a compression spring), a washer 230, and a mating part 240. The fastener 210 and the mating part 240 are configured to be corresponding mating parts, such that when an end of the fastener 210 is received by the mating part 240, the fastener 210 and the mating part 240 are fixedly attached. In some examples, the fastener 210 may comprise a threaded portion configured to be received by a corresponding threaded portion of the mating part 240. The fastener 210 may be a screw or a bolt, and the mating part 240 may be a corresponding nut. In some examples, the fastener 210 may be a rivet and the mating part 240 may be a corresponding rivet nut. In some examples, the amount of the fastener 210 received by the mating part 240 may be restricted, i.e., the mating part 240 may receive a maximum amount of the fastener 210.

[0069] As illustrated in FIG. 3, the fastener 210 is configured to extend through the body 110 and the fastening portion 128, and an end of the fastener 210 is configured to be received by the mating part 240. In other words, the mating part 240 is configured to receive and engage with a portion of the fastener 210 through the fastening portion 128 such that the body 110 and the mounting assembly are connected.

[0070] The body 110 may comprise a connecting hole 112 and the fastener 210 may be configured to extend through the connecting hole 112. When the elongate shaft 214 is received by the connecting hole 112, a clearance may be provided between the elongate shaft 214 and the connecting hole 112. This therefore allows movement of the body 110, due to deformation of the body 110, in the perpendicular axes from the elongate shaft of the fastener 210 (i.e., in the x- and / or z-directions). In some examples, the connecting hole 112 may, in at least one direction, be (at least) 1.4 times wider than the fastener 210 (i.e., the elongate shaft 214 of the fastener 210). In some examples, the connecting hole 112 and the fastener 210 may have a circular cross-section, and the diameter of the connecting hole 112 is (at least) 1.4 times the diameter of the fastener 210 (i.e., the diameter of the elongate shaft 214 of the fastener 210).

[0071] In addition, the fastening portion 128 is configured to receive at least a portion of the fastener 210. In FIG. 3, the fastening portion 128 comprises a hole 129 and the fastener 210 is configured to extend through the hole 129 of the fastening portion 128 when the body 110 is connected to the mounting assembly 120. Therefore, the fastener 210 is configured to extend through the connecting hole 112 of the body 110 and the hole 129 of the fastening portion 128, and configured to be at least partially received by the mating part 240 when the fixing arrangement 130 connects the body 110 to the mounting assembly 120.

[0072] The body 110 may further comprise a depression 114 (e.g., a recess) such that a portion of the fastener 210, the helical spring 220 and the washer 230 are positioned in the depression 114 when the fixing arrangement 130 connects the body 110 to the mounting assembly 120 (i.e., to the fastening portion 128). In the illustrated example of FIG. 3, the connecting hole 112 is arranged to extend from within the depression 114. The depression 114 may therefore be configured to at least partially conceal a portion of the fixing arrangement 130. The dimensions of the depression 114, in the x- and z-directions, are arranged to be larger than the washer 230. In some examples, the washer 230 may be circular, and the depression 114 may have a diameter which is between 5 and 15 % larger than the diameter of the washer 230. In some examples, the diameter of the depression 114 may be 12 % larger than the diameter of the washer 230.

[0073] In FIG. 3, the fastener 210 is an elongate fastener comprising a head 212 and an elongate shaft 214, where the elongate shaft 214 extends from the head 212. The elongate shaft 214 is configured to extend through the body 110 and through the fastening portion 128, when the body 110 is connected to the mounting assembly. The end of the fastener 210 to be received by the mating part 240 is arranged at a distal end of the elongate shaft 214 from the head 212.

[0074] In some examples, the elongate shaft 214 of the fastener 210 may have a circular cross-section. The connecting hole 112 of the body 110 and the hole 129 of the fastening portion 128 may be circular. In other examples, the connecting hole 112 of the body 110 and the hole 129 of the fastening portion 128 may be slotted.

[0075] In the illustrated example of FIG. 3, the mating part 240 comprises a stop 242 which is configured to restrict the portion of the fastener 210 received by the mating part 240. Therefore, there is a maximum amount of the fastener 210 which the mating part 240 can receive. In other words, the fixing arrangement 130 is configured to achieve a peak tightness, as determined by the stop 242 of the mating part 240. In some examples, the stop 242 may be a partial closure at one end to prevent the fastener 210 from extending further through the mating part 240, as illustrated in FIG. 3. In this manner, the stop 242 may be a lip which restricts the amount of the fastener 210 received, or receivable, by the mating part 240. The mating part 240 may be a lock nut, such as a nut with a nylon insert. In some examples, the stop 242 may be a total closure at an end of the mating part 240. The stop 242 may be a cap, or a dome, such that the mating part 240 is a cap nut or a dome nut. The mating part 240 may be a blind nut.

[0076] In some examples, a portion of the mating part 240 may be received by the hole 129 of the fastening portion 128 when the body 110 is connected to the mounting assembly 120 by the fixing arrangement 130. The mating part 240 may be fixedly engaged (e.g., rotationally and / or axially) with the fastening portion 128 (i.e., the hole 129 of the fastening portion 128) when the body 110 is connected to the mounting assembly. The portion of the mating part 240 may be configured to form an interference fit when received by the hole 129 of the fastening portion 128. The mating part 240 may be expandable, such as an expanding nut, and may be configured to expand into the hole 129 of the fastening portion 128 when engaged with the portion of the fastener 210. In some examples, the mating part may be a rivet nut.

[0077] As illustrated in FIG. 3, the helical spring 220 is positioned between the head 212 of the fastener 210 and the washer 230. Therefore, the helical spring 220 is configured to impart the bias along an axis parallel to the elongate shaft 214 of the fastener 210, i.e., along the y-direction. This is because a portion of the fastener 210 is received by the helical spring 220 and the tension of the helical spring 220 is along the axis parallel to the elongate shaft 214 of the fastener 210, i.e., in the y-direction. When the body 110 is connected to the mounting assembly 120, i.e., the mating part 240 is engaged with the fastener 210, the helical spring 220 is at least partially compressed.

[0078] The helical spring 220 is arranged between the head 212 of the fastener 210 and the washer 230. The helical spring 220 is arranged to abut against a surface of the head 212. In particular, the helical spring 220 is arranged to abut against a surface of the head 212 from which the elongate shaft 214 extends from. The helical spring 220 is further arranged to abut against the washer 230, which is configured to spread the exerted load across an opening of a connecting hole 112 of the body 110. In some examples, the ends of the helical spring 220 are flat (e.g., ground, or squared ends). The ends of the helical spring 220 may comprise closed or open ends. It may be that the helical spring 220 comprises closed and ground ends, or closed and squared ends. In some examples, the helical spring 220 may comprise open and ground ends.

[0079] Although depicted as a helical spring 220, any form of spring configured to be at least partially compressible is envisaged. The spring used in the fixing arrangement 130 may be at least partially compressed when the body 110 is connected to the fastening portion 128. In some examples, the spring may be configured to receive at least a portion of the fastener 210 (e.g., a portion of the elongate shaft 214). For example, the spring may comprise a hole configured to receive at least a portion of the fastener 210. The spring may be one or more disc springs, one or more leaf springs, a volute spring, one or more flat springs, a gas spring, or an air spring. In some examples, the spring may be replaced with a bellow, e.g., a metal bellow, configured to be at least partially compressible.

[0080] In the illustrated example, the washer 230 is, in at least one direction (e.g., the x-direction), 2 times wider than the connecting hole 112. In some examples, the washer 230 may, in at least one direction, be more than 2 times as wide as the connecting hole 112. This therefore spreads the load exerted onto the washer 230 by the helical spring 220 across the body 110. This can advantageously reduce the amount of damage caused on the body 110. The size of the washer 230, in comparison to the size of the connecting hole 112, allows contact to be maintained with the body 110 when the body 110 deforms. In other words, even if the size of the connecting hole 112 changes over time (i.e., due to deformation of the body 110) the washer 230 maintains contact therefore maintaining the connection between the body 110 and the mounting assembly 120. In some examples, the connecting hole 112 and the washer 230 may have a circular cross-section, and the diameter of the washer 230 is 2 times the diameter of the connecting hole 112.

[0081] The helical spring 220 is configured to create the bias, which is configured to compensate for deformation of the body 210 to maintain a fastening force. The helical spring 220 is configured to urge at least a portion of the bias against the fastener 210, e.g., the head 212 of the fastener 210. The helical spring 220 is configured to urge at least a portion of the bias against the washer 230. The helical spring 220 may have a spring constant which is greater than, or equal to, 0.05 N / mm.

[0082] As illustrated in FIG. 3, the helical spring 220 comprises more than one turn (e.g., a plurality of turns) and is configured to receive at least a portion of the fastener 210 (e.g., a portion of the elongate shaft 214). When the body 110 is connected to the mounting assembly 120 (i.e., the fastening portion 128), a spacing is provided between the turns of the helical spring 220. In other words, the helical spring 220 may be partially compressed when the body 110 is connected to the mounting assembly 120, and not fully compressed. When at a peak tightness, the helical spring 220 is not coil bound, i.e., is able to deform bidirectionally. Therefore, when the body 110 is connected to the mounting assembly, the pitch between the turns of the helical spring 220 may be less than the pitch of the helical spring 220 in a relaxed state, i.e., when uncompressed. The spacing therefore allows, as the body 110 deforms, the washer 230 to move bidirectionally, in either direction along the y-direction (upwards or downwards). In other words, the compression of the helical spring 220 may be increased or decreased during deformation of the body 110. This therefore compensates for the (unpredictable) deformation of the body 110 to maintain the fastening force.

[0083] When the body 110 is connected to the mounting assembly by the fixing arrangement 130, the body 210 may contact the circuitry enclosure and / or the securing portion such that a gap 250 is present between the body 110 and the fastening portion 128. For example, there may be a gap 250 between the body 110 and the fastening portion 128 when the fixing arrangement 130 is at a peak tightness. The gap 250 is arranged to provide space for the body 110 to move into when deforming. This movement restricts the amount of stress exerted onto the fastening portion 128 during deformation, or the fastening portion 128 damaging the body 110, which would occur if the body 110 contacted the fastening portion 128.

[0084] The bias created by the helical spring 220 may be insufficient to move the fastening portion 128 closer to the body 110. In particular, the connection between the mating part 240 and the fastening portion 128, and the rigidity of the fastening portion 128, may be such that the bias created by the helical spring 220 is insufficient to move the fastening portion 128 closer to the body 110. Further, the body 110 may be arranged such that the bias created by the helical spring 220 is insufficient to move the body 110 closer to the fastening portion 128. This is explained in greater detail below in relation to FIGs. 4A and 4B. In some examples, the body 110 may be arranged to contact the circuitry enclosure 150 and / or the securing portion 124 such that the bias of the fixing arrangement 130 is insufficient to move the body 110 closer to the fastening portion 128. In other words, when the body 110 is connected to the mounting assembly 120, the gap 250 is maintained.

[0085] In some examples, the luminaire 100 may comprise a compression limiter (not illustrated). The compression limiter may be positioned between the body 110 and the fastening portion 128. The compression limiter may be configured to limit further tightening of the fixing arrangement 130 and enable a degree of freedom of movement / deformation of the body 110 when the fixing arrangement 130 is at a peak tightness as determined by the compression limiter. The compression limiter may be a hollow sleeve of material having a higher Young's modulus than the material forming the body 110. The compression limiter may therefore prevent the fastener 210 from damaging (e.g., crushing) the body 110.

[0086] Although the compression limiter is not illustrated in FIG. 3, the compression limiter would be arranged to abut against the washer 130 and against the fastening portion 128, i.e., be positioned at least partially inside the connecting hole 112. In particular, the compression limiter would abut against an underside of the washer 230 (i.e., the side of the washer 230 abutting against the body 110 in FIG. 3) and abut against an upper side of the fastening portion 128 (i.e., the surface of the fastening portion 128 closest to the body 110). The compression limiter may therefore ensure that the gap 150 between the fastening portion 128 and the body 110 is maintained. The length of the compression limiter is therefore equal to the distance between the underside of the washer 230 and the upper side of the fastening portion 128 (i.e., the combination of the length of the connecting hole 112 and the gap 250). The internal diameter of the compression limiter may be such that a clearance is provided between the inside of the compression limiter and the elongate shaft 214 of the fastener 210. For example, the internal diameter of the compression limiter may, in at least one direction, be between 1.4 and 2 times wider than the fastener 210 (i.e., the elongate shaft 214 of the fastener 210).

[0087] The fixing arrangement 130 is illustrated in a particular order in FIG. 3. However, it is envisaged that the components of the fixing arrangement 130 may be in a different order. For example, the head 212 of the fastener 210 may be arranged to engage with the fastening portion 128, and the mating part 240 may be arranged to engage with the body 210. The helical spring 220, or an additional helical spring, may be positioned between the head 212 of the fastener 210 and the fastening portion 128, or between the mating part 240 and the fastening portion 128. In some examples, the helical spring 220, or an additional helical spring, may be positioned between the body 210 and the fastening portion 128, i.e., in the gap 250.

[0088] FIG. 4A shows a side-view cross-section, and FIG. 4B shows a cross-section view towards the front, of the luminaire 100. The luminaire 100 is similar to the luminaires discussed above in relation to FIGs. 1 to 3. The fixing arrangement 130, and the connection between the body 110 and the fastening portion 128, are the same as described above in relation to FIG. 3.

[0089] In the illustrated examples of FIGs. 4A and 4B, the securing portion 124 and the fastening portion 128 are integrally formed. The integrally formed securing portion 124 and fastening portion 128 are fixedly connected to the mounting portion 122. The discontinuity 126 configured to receive the cable may be through the integrally formed securing portion 124 and fastening portion 128, and through the mounting portion 122 as illustrated in FIG. 4A. The cable extending through the discontinuity 126 may be received by a connector 310, such as a cable gland, at least partially positioned in the circuitry enclosure 150. The connector 310 may therefore be configured to receive a portion of the cable to allow the cable to supply power to circuitry 160 housed inside the circuitry enclosure 150. In some examples, the connector 310 may be configured to form a waterproof seal in order to prevent water ingress into the circuitry enclosure 150.

[0090] The mounting portion 122, as illustrated in FIG. 4A, may comprise a plurality of holes for mounting the luminaire 100. For example, each of the plurality of holes may be configured to receive a fastener, such as a screw, for mounting the luminaire 100.

[0091] The luminaire 100 of FIGs. 4A and 4B comprises a sensor device 320. The body 110 and the circuitry enclosure 150 each comprise a hole arranged to receive at least a portion of the sensor device 320. As illustrated in FIGs. 4A and 4B, the sensor device 320 may protrude from the body 110 when the sensor device 320 is received by the body 110 and the circuitry enclosure 150.

[0092] The sensor device 320 may be configured to detect ambient light levels. In particular, the sensor device 320 may comprise a light sensor, such as a photocell. The luminaire 100 may be configured to illuminate an area of interest when the light level sensed by the sensor device 320 is below a threshold. The sensor device 320 may comprise a communication interface. For example, the communication interface may comprise a transmitter and / or a transceiver. The sensor device 320 may be configured to communicate with a timer and / or with a central management system. The timer may be used to determine when and for how long the luminaire 100 is to provide area lighting. In some examples, the luminaire 100 may comprise the timer, for example housed in the cavity 152. In some examples, the timer may be an external timer, i.e., a timer external to the luminaire 100. The central management system may be configured to provide remote, dynamic control of the luminaire 100. For example, the luminaire 100 may receive instructions (e.g., the illumination time) from the central management system via the sensor device 320, e.g., via the communication interface.

[0093] The sensor device 320 may be configured to communicate with an external user device, for example using short-range communication, such as near field communication (NFC) and / or Bluetooth (RTM). It may be that the luminaire 100 is configured to communicate with the external user device via a transceiver of the sensor device 320. The external user device may provide instructions to the luminaire 100. For example, the instructions may include to use and / or not use a particular driving circuitry and / or light.

[0094] In the illustrated example, the circuitry enclosure 150 includes a protruding portion 154 which is arranged to receive at least a portion of the sensor device 320. In FIGs. 4A and 4B, the protruding portion 154 extends along the (positive) y-direction. The protruding portion 154 comprises the hole in the circuitry enclosure 150 for receiving the portion of the sensor device 320.

[0095] In FIGs. 4A and 4B, the body 110 comprises a corresponding hole configured to receive at least a portion of the sensor device 320. In particular, the corresponding hole of the body 110 is configured to receive at least a portion of the protruding portion 154. When the body 110 is connected to the mounting assembly 120 (i.e., the fastening portion 128), the protruding portion 154 of the circuitry enclosure 150 is at least partially received by the corresponding hole of the body 110.

[0096] In some examples, the body 110 may be configured to abut against the protruding portion 154. The body 110 may be configured to form an interference fit with the protruding portion 154, when the body 110 is connected to the mounting assembly 120. Therefore, there may be no clearance between the body 110 and the protruding portion 154 when the protruding portion 154 is received by the corresponding hole of the body 110. For example, the circuitry enclosure 150 may be formed from a material having a higher Young's modulus than the material forming the body 110. The circuitry enclosure 150 may be formed from a harder material than the material forming the body 110. Therefore, the body 110 around the corresponding hole may at least partially deform when receiving the protruding portion 154.

[0097] In some examples, the body 110 may be configured to form a transition fit (such as a push fit) with the protruding portion 154. This results in a minimal clearance between the body 110 and the protruding portion 154 when the protruding portion 154 is received by the corresponding hole of the body 110. In some examples, the transition fit may provide a small clearance between the body 110 and the protruding portion 154 when the protruding portion 154 is received by the corresponding hole of the body 110. This therefore allows a small amount of movement of the body 110 (due to deformation) relative to the protruding portion 154.

[0098] In some examples, the body 110 may be configured to form a clearance fit (such as a slide fit) with the protruding portion 154. The clearance fit may provide a clearance between the body 110 and the protruding portion 154 when the protruding portion 154 is received by the corresponding hole of the body 110. This therefore allows movement of the body 110 (due to deformation) relative to the protruding portion 154.

[0099] When the body 110 forms an interference fit, or a transition fit with a minimal clearance, with the protruding portion 154, the contact between the body 110 and the protruding portion 154 acts against the bias of the fixing arrangement 130. This is because the fit is configured to maintain the body 110 in position with regards to the protruding portion 154. The bias created by the helical spring 220 (as described above in relation to FIG. 3) is insufficient to overcome this contact between the body 110 and the protruding portion 154. The compression of the helical spring 220, and the position of the body 110 in relation to the mounting assembly 120, is therefore maintained. In particular, the gap 250 between the body 110 and the fastening portion 128 is maintained.

[0100] If the body 110 deforms such that the contact with the protruding portion 154 is altered, the compression of the helical spring 220 (FIG. 3) may increase or decrease. The change in compression of the helical spring 220 may result in the gap 250 (FIG. 3) between the body 110 and the fastening portion 128 increasing or decreasing. The fixing arrangement 130 therefore compensates for deformation of the body 110 while maintaining a fastening force, i.e., the body 110 is still connected to the mounting assembly 120.

[0101] In addition to the contact between the body 110 and the protruding portion 154, the body 110 may contact the circuitry enclosure 150 elsewhere. For example, FIG. 4A illustrates the body 110 contacting the circuitry enclosure 150 at a front of the luminaire 100 (i.e., at the rightmost surface of the illustrated circuitry enclosure 150). This contact between the body 110 and the circuitry enclosure 150 is configured to act against the bias of the fixing arrangement 130. In some examples, this contact may in alternative to the contact between the body 110 and the protruding portion 154.

[0102] Additionally, or alternatively, the body 110 may contact the securing portion 124, as illustrated in FIG. 4A, for example at the distal end of the securing portion 124 (i.e., at the rightmost edge of the illustrated securing portion 124). The bias created by the helical spring 220 (as described above in relation to FIG. 3) is insufficient to overcome the contact between the body 110 and the circuitry enclosure 150, and / or the contact between the body 110 and the securing portion 124. The compression of the helical spring 220, and the position of the body 110 in relation to the mounting assembly 120, is therefore maintained. Such contact / contacts may be arranged when the body 110 forms an interference fit, transition fit, or clearance fit with the protruding portion 154 when the body 110 is connected to the mounting assembly 120.

[0103] Deformation of the body 110 at the point of contact between the body 110 and the circuitry enclosure 150, and / or the securing portion 124, may result in the compression of the helical spring 220 to increase or decrease. The change in compression of the helical spring 220 may result in the gap 250 between the body 110 and the fastening portion 128 increasing or decreasing. The fixing arrangement 130 therefore compensates for deformation of the body 110 while maintaining a fastening force, i.e., the body 110 is still connected to the mounting assembly 120.

[0104] The circuitry enclosure 150 may comprise a plurality of extensions 156 (e.g., flanges). Each extension 156 is configured to receive a fastener to secure the circuitry enclosure 150 to the securing portion 124. As illustrated in FIG. 4A and 4B, the plurality of extensions 156 are arranged such that, when secured to the securing portion 124, each extension 156 is positioned towards the edge of the securing portion 124. In particular, each extension 156 is positioned away from the at least one light source 140.

[0105] In FIGs. 4A and 4B, the body 110 comprises a sloped upper surface 116 configured to divert water runoff. In other words, when the luminaire 100 is used for outdoor lighting, precipitation may fall onto the body 110, and the sloped upper surface 116 is configured to direct water runoff. As illustrated in FIGs. 4A and 4B, the body 110 may therefore comprise the sloped upper surface 116 along the sides (illustrated in FIG. 4B) and the front (illustrated in FIG. 4A) of the body 110. Although illustrated as comprising a flat portion, the body 110 may be configured such that the top surface of the body 110 is also sloped in order to divert water runoff.

[0106] A portion of a bottom surface 118 of the body 110 may be arranged such that it is positioned at the same level as, or beyond, the securing portion 124, when the body is connected to the mounting assembly. In some examples, as illustrated in FIG. 4A and 4B, the bottom surface 118 of the body 110 may be configured to extend to or beyond the at least one light source 140. In other words, the thickness of the body 110 (i.e., the dimension of the body 110 illustrated in the y-direction) may be greater than the height of the circuitry enclosure (i.e., in the y-direction, to an upper surface of the protruding portion 154) combined with the thickness of the securing portion 124. This may therefore ensure that water runoff is away from the at least one light source 140.

[0107] Where a structural feature has been described, it may be replaced by means for performing one or more of the functions of the structural feature whether that function or those functions are explicitly or implicitly described.

[0108] The term 'comprise' is used in this document with an inclusive not an exclusive meaning. That is any reference to X comprising Y indicates that X may comprise only one Y or may comprise more than one Y. If it is intended to use 'comprise' with an exclusive meaning then it will be made clear in the context by referring to "comprising only one..." or by using "consisting".

[0109] In this description, the wording 'connect' and 'communication' and their derivatives mean operationally connected / in communication. It should be appreciated that any number or combination of intervening components can exist (including no intervening components), i.e., so as to provide direct or indirect connection / communication. Any such intervening components can include hardware and / or software components.

[0110] As used herein, the term "determine / determining" (and grammatical variants thereof) can include, not least: calculating, computing, processing, deriving, measuring, investigating, identifying, looking up (for example, looking up in a table, a database or another data structure), ascertaining and the like. Also, "determining" can include receiving (for example, receiving information), accessing (for example, accessing data in a memory), obtaining and the like. Also, " determine / determining" can include resolving, selecting, choosing, establishing, and the like.

[0111] In this description, reference has been made to various examples. The description of features or functions in relation to an example indicates that those features or functions are present in that example. The use of the term 'example' or 'for example' or 'can' or 'may' in the text denotes, whether explicitly stated or not, that such features or functions are present in at least the described example, whether described as an example or not, and that they can be, but are not necessarily, present in some of or all other examples. Thus 'example', 'for example', 'can' or 'may' refers to a particular instance in a class of examples. A property of the instance can be a property of only that instance or a property of the class or a property of a subclass of the class that includes some but not all of the instances in the class. It is therefore implicitly disclosed that a feature described with reference to one example but not with reference to another example, can where possible be used in that other example as part of a working combination but does not necessarily have to be used in that other example.

[0112] Although examples have been described in the preceding paragraphs with reference to various examples, it should be appreciated that modifications to the examples given can be made without departing from the scope of the claims.

[0113] Features described in the preceding description may be used in combinations other than the combinations explicitly described above.

[0114] Although functions have been described with reference to certain features, those functions may be performable by other features whether described or not.

[0115] Although features have been described with reference to certain examples, those features may also be present in other examples whether described or not.

[0116] The term 'a', 'an' or `the' is used in this document with an inclusive not an exclusive meaning. That is any reference to X comprising a / an / the Y indicates that X may comprise only one Y or may comprise more than one Y unless the context clearly indicates the contrary. If it is intended to use 'a', 'an' or `the' with an exclusive meaning then it will be made clear in the context. In some circumstances the use of 'at least one' or 'one or more' may be used to emphasis an inclusive meaning but the absence of these terms should not be taken to infer any exclusive meaning.

[0117] The presence of a feature (or combination of features) in a claim is a reference to that feature or (combination of features) itself and also to features that achieve substantially the same technical effect (equivalent features). The equivalent features include, for example, features that are variants and achieve substantially the same result in substantially the same way. The equivalent features include, for example, features that perform substantially the same function, in substantially the same way to achieve substantially the same result.

[0118] In this description, reference has been made to various examples using adjectives or adjectival phrases to describe characteristics of the examples. Such a description of a characteristic in relation to an example indicates that the characteristic is present in some examples exactly as described and is present in other examples substantially as described.

[0119] The above description describes some examples of the present disclosure however those of ordinary skill in the art will be aware of possible alternative structures and method features which offer equivalent functionality to the specific examples of such structures and features described herein above and which for the sake of brevity and clarity have been omitted from the above description. Nonetheless, the above description should be read as implicitly including reference to such alternative structures and method features which provide equivalent functionality unless such alternative structures or method features are explicitly excluded in the above description of the examples of the present disclosure.

[0120] Whilst endeavoring in the foregoing specification to draw attention to those features believed to be of importance it should be understood that the Applicant may seek protection via the claims in respect of any patentable feature or combination of features hereinbefore referred to and / or shown in the drawings whether or not emphasis has been placed thereon.

Examples

Embodiment Construction

[0040]Some examples will now be described with reference to the accompanying drawings in which:

FIG. 1A shows a schematic diagram of an example of a luminaire with a cover; FIG. 1B shows a schematic diagram of the luminaire with the cover being deformed; FIG. 2 shows a side-view cross-section of the luminaire; FIG. 3 shows a close-up view of an example fixing arrangement; FIG. 4A shows a side-view cross-section of the luminaire; and FIG. 4B shows a cross-section view of the luminaire.

[0041]The figures are not necessarily to scale. Certain features and views of the figures can be shown schematically or exaggerated in scale in the interest of clarity and conciseness. For example, the dimensions of some elements in the figures can be exaggerated relative to other elements to aid explication. Similar reference numerals are used in the figures to designate similar features. For clarity, all reference numerals are not necessarily displayed in all figures.

DETAILED DESCRIPTION

[0042]Embodim...

Claims

1. A luminaire for exterior lighting comprising: a mounting assembly comprising a securing portion, wherein the securing portion is configured to secure at least one light source; a body configured to at least partially cover the securing portion, wherein the body comprises a hygroscopic material; and a fixing arrangement configured to connect the body to the mounting assembly, wherein the fixing arrangement comprises a bias configured to compensate for deformation of the body to maintain a fastening force.

2. The luminaire of claim 1, wherein the body is made from wood.

3. The luminaire of any preceding claim, wherein the fixing arrangement comprises a fastener configured to extend through a connecting hole in the body, and wherein, optionally, in at least one direction, the connecting hole in the body is 1.4 times wider than the fastener.

4. The luminaire of claim 3, wherein the fixing arrangement comprises a spring configured to create the bias, and wherein, optionally, the spring is a helical spring comprising more than one turn, and wherein, optionally, the fastener comprises a head and the spring is configured to urge at least a portion of the bias against the head of the fastener, and wherein, optionally, when the body is connected to the mounting assembly, a spacing is provided between turns of the spring.

5. The luminaire of any one of claims 3 or 4, wherein the fastener comprises an elongate shaft, and the bias is imparted along an axis parallel to the elongate shaft of the fastener.

6. The luminaire of any one of claims 3 to 5, wherein the mounting assembly comprises a fastening portion configured to receive at least a portion of the fastener, and wherein, optionally, the fixing arrangement comprises a mating part configured to receive and engage with a portion of the fastener through the fastening portion such that the body and the mounting assembly are connected, and wherein, optionally the mating part comprises a stop configured to restrict the portion of the fastener received by the mating part, and wherein, optionally, the luminaire comprises a compression limiter configured to limit further tightening of the fixing arrangement and enable a degree of freedom of movement of the body when the fixing arrangement is at a peak tightness as determined by the compression limiter.

7. The luminaire of any preceding claim, wherein the luminaire comprises a circuitry enclosure configured to be secured to the securing portion to form a cavity, wherein the body is configured to at least partially cover the circuitry enclosure.

8. The luminaire of any preceding claim, wherein the mounting assembly comprises a mounting portion configured to mount the luminaire such that, when the luminaire is mounted, the luminaire is mounted in a cantilever manner.

9. The luminaire of any preceding claim, wherein the mounting assembly comprises a discontinuity configured to receive a cable for supplying power to the at least one light source.

10. A luminaire for exterior lighting comprising: a mounting assembly comprising a securing portion, wherein the securing portion is configured to secure at least one light source; a circuitry enclosure configured to be secured to the securing portion to form a cavity; and a body configured to at least partially cover the circuitry enclosure, wherein the body comprises a hygroscopic material.

11. The luminaire of claim 10, wherein the cavity is configured to house circuitry configured to supply power to the at least one light source.

12. The luminaire of any one of claims 10 or 11, wherein the at least one light source is configured to be secured to a first surface of the securing portion and the circuitry enclosure is configured to be secured to a second surface of the securing portion, wherein the first and second surfaces are separated by a thickness of the securing portion.

13. The luminaire of any one of claims 10 to 12, wherein the circuitry enclosure comprises a hole configured to receive at least a portion of a sensor device, and wherein the body comprises a corresponding hole configured to receive at least a portion of the sensor device, and wherein, optionally, the luminaire comprises the sensor device, the sensor device is configured to make electrical contact with circuitry housed by the circuitry enclosure through the hole in the circuitry enclosure and the corresponding hole in the body.

14. The luminaire of any one of claims 10 to 13, wherein the body comprises a sloped upper surface to divert water runoff, and wherein, optionally, when the body is connected to the mounting assembly, at least a portion of a bottom surface of the body is arranged to extend to or beyond the securing portion.

15. The luminaire of any one of claims 10 to 14, wherein the luminaire comprises a fixing arrangement configured to connect the body to the mounting assembly.

Images