Abstract
A lamp unit (100) for outdoor use is provided. The lamp unit comprises a gasket with a step-vise shape configured to provide a sealing effect in two perpendicular directions in order to prevent water ingress. The gasket is further configured to press a reflector (120) towards a lid element (130) in order to minimize the gap between them, thus ensuring a consistent lighting output.
Claims
1. A lamp unit, comprising at least one light source, a reflector configured to reflect the light emitted from the at least one light source, wherein the reflector elongates along a principal axis, A, and comprises a first opening for an output of the light emitted from the at least one light source, and an engagement element arranged circumferentially around the reflector in a plane perpendicular to the principal axis, A, a lid element arranged on the first opening of the reflector, the lid element comprising a flange arranged at a rim of the reflector at the first opening, a housing at least partially enclosing the reflector in a circumferential direction of the principal axis, A, a fastening element biasedly engaged with the housing, wherein the flange is at least partially arranged between the fastening element and the housing in a direction parallel to the principal axis, A, and wherein the fastening element is configured to bias the flange in a direction parallel to the principal axis, A, and a gasket arranged circumferentially around the reflector in a plane perpendicular to the principal axis, A, wherein the gasket has a step-wise shape in a cross-section of the plane and comprises a first portion extending transverse to the principal axis, A, and being arranged between the flange and the housing in a direction parallel to the principal axis, A, a second portion extending along the principal axis, A, and being arranged between the housing and the flange in a direction perpendicular to the principal axis, A, and a third portion extending transverse to the principal axis, A, and being engaged with the engagement element, wherein the fastening element is configured to clamp the first portion between the flange and the housing in a direction parallel to the principal axis, A, and to clamp the second portion between the housing and the flange in a direction perpendicular to the principal axis, A, and wherein the third portion, via the engagement element, is configured to press the reflector towards the lid element.
2. The lamp unit according to claim 1, wherein the lid element comprises at least one of a diffuser and a lens.
3. The lamp unit according to claim 1, wherein the engagement element is a flange portion.
4. The lamp unit according to claim 3, wherein the third portion comprises a cavity configured to receive the flange portion.
5. The lamp unit according to claim 1, wherein the flange comprises a first part extending transverse to the principal axis, A, and being arranged between the fastening element and the first portion in a direction parallel to the principal axis, A, and a second part extending along the principal axis, A, and being arranged between the second portion and the reflector in a direction perpendicular to the principal axis, A.
6. The lamp unit according to claim 1, wherein the fastening element comprises a first set of threads, and wherein the housing comprises a second set of threads configured to receive the first set of threads.
7. The lamp unit according to claim 1, wherein the fastening element is configured to be fastened to the housing via a snap connection.
8. The lamp unit according to claim 1, wherein the lamp unit further comprises a diffuser element arranged between the at least one light source and the reflector in a direction parallel to the principal axis, A.
9. The lamp unit according to claim 1, wherein the flange further comprises at least one first protruding element being in engagement with the fastening element.
10. The lamp unit according to claim 1, wherein the gasket further comprises at least one second protruding element, and the housing further comprises at least one first cavity, wherein the at least one first cavity is configured to receive the at least one second protruding element.
11. The lamp unit according to claim 1, wherein the gasket further comprises at least one third protruding element, and the flange further comprises at least one second cavity, wherein the at least one second cavity is configured to receive the at least one third protruding element.
12. The lamp unit according to claim 1, wherein the at least one light source comprises at least one light-emitting diode, LED.
13. A lighting arrangement, comprising two lamp units according to claim 1, wherein the lamp units are oppositely arranged in the lighting arrangement for a respective output of the light from the lighting arrangement in opposite directions.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing embodiment(s) of the invention.
[0028] FIG. 1 schematically shows a cross-sectional view of a lamp unit according to an exemplifying embodiment of the present invention,
[0029] FIG. 2 schematically shows a cross-sectional view of a part of a lamp unit according to an exemplifying embodiment of the present invention,
[0030] FIG. 3 schematically shows a cross-sectional view of a part of a lamp unit according to an exemplifying embodiment of the present invention,
[0031] FIG. 4 schematically shows a cross-sectional view of a part of a lamp unit according to an exemplifying embodiment of the present invention,
[0032] FIG. 5 shows an exemplary lighting system comprising two lamp units.
DETAILED DESCRIPTION
[0033] FIG. 1 shows a cross-sectional view of a lamp unit 100 according to an exemplifying embodiment of the present invention. The lamp unit 100 comprises at least one light source 105 which may constitute one or more LEDs. The lamp unit 100 further comprises a diffuser element 107 configured to diffuse the light emitted from the light source(s) 105 during operation. The lamp unit 100 further comprises a dome or cone-shaped reflector 120, elongating along a principal axis, A. The reflector 120 is configured to reflect the light emitted from the light source(s) 105 during operation. The reflector 120 comprises a first opening 115 for an output of the light emitted from the at least one light source 105. The lamp unit 100 further comprises a lid element 130 arranged on the first opening 115 of the reflector 120. The lid element 130 comprises a diffuser and/or a lens. The lid element 130 comprises a flange 132. The lamp unit 100 further comprises a housing 110 at least partially enclosing the reflector 120 in a circumferential direction of the principal axis, A. The lamp unit 100 further comprises a fastening element 140 biasedly engaged with the housing 110, wherein the flange 132 is at least partially arranged between the fastening element 140 and the housing 110 in a direction parallel to the principal axis, A. The lamp unit 100 further comprises a gasket 150 arranged circumferentially around the reflector 120 in a plane perpendicular to the principal axis, A, wherein a cross section of gasket 150 has a step-wise shape.
[0034] The gasket 150 of the lamp unit 100 of FIG. 1 is arranged between the housing 110 and the flange 132. The gasket 150 is configured to have a double sealing effect providing a seal in two directions of the lamp unit 100, parallel and perpendicular to the principal axis, A. The double sealing effect of the gasket 150 provides an advantageous way of preventing water ingress of the lamp unit 100. The gasket 150 is further configured to press the reflector 120 towards the lid element 130. When the reflector 120 is pushed towards the lid element 130 by the gasket 150, the gap between them is minimized. This is beneficial for the lighting output of the lamp unit 100 which becomes more consistent.
[0035] FIG. 2 shows a cross-sectional view of a part of the lamp unit 100 in FIG. 1 according to an exemplifying embodiment of the present invention. In accordance with the example of FIG. 1, the reflector 120 of the lamp unit 100 elongates along a principal axis, A. The reflector 120 comprises an engagement element 118 arranged circumferentially around the reflector 120 in a plane perpendicular to the principal axis, A. The lid element 130 of the lamp unit 100 comprises a flange 132. The housing 110 of the lamp unit 100 at least partially encloses the reflector 120 in a circumferential direction of the principal axis, A. Furthermore, in accordance with the lamp unit 100 of FIG. 1, the fastening element 140 of the lamp unit 100 in FIG. 2 biasedly engages with the housing 110. The flange 132 is at least partially arranged between the fastening element 140 and the housing 110 in a direction parallel to the principal axis, A. The fastening element 140 is configured to bias the flange 132 in a direction parallel to the principal axis, A. The fastening element 140 comprises a first set of threads 142 and the housing 110 comprises a second set of threads 112, wherein the first and second sets of threads 142, 112 are configured to matingly engage upon fastening of the fastening element 140 to the housing 110. The flange 132 comprises a first part 132a extending transverse, in the figure perpendicular, to the principal axis, A, and a second part 132b extending along, in the figure parallel, to the principal axis, A. It will be appreciated that the flange 132 may alternatively have different shapes, as long as the cross section of the flange 132 at least comprises the first part 132a and the second part 132b.
[0036] In accordance with the lamp unit 100 of FIG. 1, the gasket 150 in FIG. 2 is arranged circumferentially around the reflector 120 in a plane perpendicular to the principal axis, A. The gasket 150 comprises a first portion 155a extending at least partially transverse, in the figure perpendicular, to the principal axis, A. The gasket 150 further comprises a second portion 155b extending at least partially along the principal axis, A. The gasket 150 further comprises a third portion 155c extending at least partially transverse to the principal axis, A. Thus, the gasket 150 has an at least partially step-wise shape (or Z-like shape) in a cross-section of the plane perpendicular to the principal axis, A. The flange 132 is configured to engage with the gasket 150. The first part 132a is configured to engage with the first portion 155a and the second part 132b is configured to engage with the second portion 155b, thus creating a double sealing effect of the lamp unit 100. The third portion 155c is configured to engage with the engagement element 118 in order to press the reflector 120 towards the lid element 130. The third portion 155c may comprise at least one cavity (not shown), configured to matingly receive at least a portion of the engagement element.
[0037] FIG. 3 shows a cross-sectional view of a part of the lamp unit 100 according to an exemplifying embodiment of the present invention. It will be appreciated that the lamp unit 100 of FIG. 3 is similar to that shown in FIG. 2, and it is referred to FIG. 2 and the associated text for a more detailed description of the specific features. The first part 132a of the flange 132 in FIG. 3 comprises a first protruding element 134 arranged circumferentially around the first principle axis, A, wherein the first protruding element 134 is in engagement with the fastening element 140. The first protruding element 134 is not considered to be limited by the figure, and it should be noted that the first protruding element 134 may be e.g. a bulge of the flange 132, a part or portion extending from the flange 132, a part or portion biased towards the fastening element 140, or the like. The gasket 150 further comprises at least one second protruding element 152, and the housing 110 further comprises at least one second cavity 114 (not shown) configured to receive the at least one second protruding element 152. It is to be understood that the shape of the second protruding element 152 and the second cavity 114 may vary between different embodiments, and it should be clear to the skilled person to create other shapes for engaging the two. The gasket 150 according to FIG. 3 further comprises three third protruding elements 154, and the flange 132 further comprises three corresponding second cavities 138 (not shown) configured to receive the third protruding elements 154. It is to be understood that the shape(s) of the third protruding elements 154 and the shape(s) of the second cavities 138 may vary between different embodiments, and it should be clear to the skilled person that other shapes than those indicated may be feasible for engagement. It is also understood that the protruding elements 152, 154 could be at least one of a single ridge arranged circumferentially around the first principle axis, A, and a set of protruding elements arranged on a circumferential plane around the principle axis, A. Correspondingly, the second cavities 114, 138 could be at least one of a single continuous cavity arranged circumferentially around the first principle axis, A, and set of cavities arranged on a circumferential plane around the principle axis, A, configured to receive the protruding elements 152, 154.
[0038] FIG. 4 shows a cross-sectional view of a part of a lamp unit 200 according to an exemplifying embodiment of the present invention. The lamp unit 200 of FIG. 4 is similar to the lamp unit 100 shown in FIG. 2, and it is referred to FIG. 2 and the associated text for a more detailed description of the specific features. The fastening element 240 of the lamp unit 200 differs from the fastening element in FIG. 2 in that the fastening element 240 comprises a snap connection 244 configured to be fastened to the housing 210. The snap connection 244 could e.g. be at least one of a cantilever connection, torsional connection and annular snap-fit connection, or the like. It is to be understood that the fastening element 240 and the housing 210 could have an inverse relationship and/or inverse configuration than that exemplified in FIG. 4, i.e. opposite functions of the fastening element 240 and the housing 210. Hence, the housing 210 may be configured to be fastened to the fastening element 240.
[0039] FIG. 5 shows an exemplary lighting arrangement 300 comprising two lamp units 100 according to any of the previously discussed embodiments. The lighting arrangement 300 comprises a cylinder-shaped housing 310 which elongates along a principle axis, A. It will be appreciated that the housing 310 may constitute the housing 110 as exemplified in one or more of the previously described embodiments. Alternatively, the housing 310 may enclose the housing 110. The lamp units 100 are provided at oppositely arranged positions within the lighting arrangement 300 with respect to the principle axis, A. Hence, the lamp units 100 are arranged to emit light from the lighting arrangement 300 in opposite directions. The lamp units 100 make use of the gaskets described in the previous embodiments, whereby the gaskets are configured to press the reflectors towards the lid elements, respectively. This creates a lighting output from the lighting arrangement 300 that is symmetric. For example, in case the lighting arrangement 300 is arranged as exemplified in FIG. 5, i.e. wherein the principle axis, A, is vertical, the lighting arrangement 300 is configured to emit light which is symmetric in the upwards and downwards directions. It is understood that the skilled man would be able to consider other directions for the lamp units 100 and/or other lighting arrangements 300 comprising more than two lamp units in order to provide other lighting outputs.
