Abstract
A light module for an elongated interior aircraft light includes: a plurality of light sources, forming an array of light sources that extends between a first lateral end portion of the light module and a second lateral end portion of the light module; and an elongated light transmissive cover that is arranged over the array of light sources, wherein the elongated light transmissive cover allows a forward light output portion, emitted by the plurality of light sources towards the elongated light transmissive cover, to pass through; wherein, at at least one of the first lateral end portion and the second lateral end portion, a light output boosting lateral end cap is provided, wherein the light output boosting lateral end cap is shaped to mesh with a neighboring lateral end cap of a neighboring light module.
Claims
1. A light module for an elongated interior aircraft light, the light module comprising: a plurality of light sources, forming an array of light sources that extends between a first lateral end portion of the light module and a second lateral end portion of the light module; and an elongated light transmissive cover that is arranged over the array of light sources, wherein the elongated light transmissive cover allows a forward light output portion, emitted by the plurality of light sources towards the elongated light transmissive cover, to pass through; wherein, at least one of the first lateral end portion and the second lateral end portion, a light output boosting lateral end cap is provided, wherein the light output boosting lateral end cap is shaped to mesh with a neighboring lateral end cap of a neighboring light module, and has a light re-directing element, wherein the light re-directing element is configured to re-direct at least some light of a lateral light output portion, emitted by the plurality of light sources and incident on the light output boosting lateral end cap, to form an ancillary forward light output portion, which passes along a side face of the light output boosting lateral end cap.
2. A light module according to claim 1, wherein: the light re-directing element comprises a reflective surface for forming the ancillary forward light output portion, wherein the reflective surface is a specular reflection surface or a total internal reflection surface; or the light re-directing element is made from a translucent material, with a re-directing of light within the light re-directing element forming the ancillary forward light output portion.
3. A light module according to claim 1, wherein the light re-directing element is formed as a protrusion, extending laterally outwards from the side face of the light output boosting lateral end cap.
4. A light module according to claim 3, wherein the protrusion is a rib-shaped protrusion.
5. A light module according to claim 3, wherein: the protrusion has a width in the range of between 4 mm and 8 mm; or the protrusion extends laterally outwards from the side face of the light output boosting lateral end cap by between 1 mm and 5 mm; or the protrusion has a height in the range of between 0.5 mm and 5 mm.
6. A light module according to claim 3, wherein the light output boosting lateral end cap comprises a recess for receiving a neighboring light re-directing element, formed as a protrusion of the neighboring lateral end cap of the neighboring light module.
7. A light module according to claim 6, wherein the protrusion and the recess of the light output boosting lateral end cap are shaped to mesh with a neighboring light output boosting lateral end cap that is of the same design as the light output boosting lateral end cap.
8. A light module according to claim 6, wherein an envelope surface of the protrusion and an envelope surface of the recess of the light output boosting lateral end cap have rotational symmetry.
9. A light module according to claim 1, wherein: the light output boosting lateral end cap is at least partly transparent; or the light output boosting lateral end cap is at least partly made of translucent material.
10. A light module according to claim 1, wherein the array of light sources is arranged along a base plate and wherein the elongated light transmissive cover is an elongated dome-shaped light transmissive cover; or wherein the array of light sources is arranged along a base portion of a trough-shaped housing and wherein the elongated light transmissive cover is an elongated light transmissive plate arranged on the trough-shaped housing.
11. A light module according to claim 1, wherein, at each of the first lateral end portion and the second lateral end portion, a respective light output boosting lateral end cap is provided.
12. An elongated interior aircraft light, comprising: a plurality of light modules according to claim 1, wherein the plurality of light modules are arranged in a row along a longitudinal extension of the elongated interior aircraft light, and wherein, at at least one interface between two of the plurality of light modules, said two of the plurality of light modules mesh with their lateral end caps.
13. An elongated interior aircraft light according to claim 12, wherein, at least one interface between two of the plurality of light modules, a protrusion of a first one of said two of the plurality of light modules, on which the light re-directing element of a light output boosting lateral end cap of the first one of said two of the plurality of light modules is formed, at least partly extends into a recess of a second one of said two of the plurality of light modules; or wherein a protrusion of the second one of said two of the plurality of light modules, on which the light re-directing element of a light output boosting lateral end cap of the second one of said two of the plurality of light modules is formed, at least partly extends into a recess of the first one of said two of the plurality of light modules.
14. An aircraft comprising: an elongated interior aircraft light according to claim 12; wherein the elongated interior aircraft light extends along a portion of a cabin wall of a passenger cabin of the aircraft; or wherein the elongated interior aircraft light is installed in a wash room or in a galley of the aircraft.
15. A method of installing an elongated interior aircraft light in an aircraft, wherein the method includes: arranging a plurality of light modules of claim 11 in a row along a longitudinal extension of the elongated interior aircraft light, wherein, at least one interface between two of the plurality of light modules, said two of the plurality of light modules mesh with their lateral end caps.
Description
BRIEF DESCRIPTION OF THE FIGURES
[0048] Further exemplary embodiments of the invention are described in the following with respect to the accompanying drawings, wherein:
[0049] FIG. 1 depicts a schematic side view of an aircraft, in which an elongated interior aircraft light according to an exemplary embodiment of the invention may be employed.
[0050] FIG. 2 depicts a schematic longitudinal cross-sectional view of a section of a passenger cabin of the aircraft of FIG. 1.
[0051] FIG. 3 depicts a schematic transverse cross-sectional view of a portion of the passenger cabin of the aircraft shown in FIG. 1.
[0052] FIG. 4 depicts a schematic perspective view of a light module according to an exemplary embodiment of the invention, which may be employed in an elongated interior aircraft light according to an exemplary embodiment of the invention.
[0053] FIG. 5 depicts a first schematic perspective view of a light output boosting lateral end cap of the light module of FIG. 4.
[0054] FIG. 6 depicts a second schematic perspective view of the light output boosting lateral end cap of FIG. 5.
[0055] FIG. 7A depicts a cross-sectional view through the light module of FIG. 4, illustrating the light emission of the light module, when the light output boosting lateral end cap is made of transparent material.
[0056] FIG. 7B depicts a cross-sectional view through the light module of FIG. 4, illustrating the light emission of the light module, when the light output boosting lateral end cap is made of translucent material.
[0057] FIG. 8 depicts the light output boosting lateral end cap of FIG. 5 in a top view, when meshing with a neighboring lateral end cap of a neighboring light module.
[0058] FIGS. 9A and 9B depict an exemplary illumination of a target surface, when an elongated interior aircraft light according to an exemplary embodiment of the invention is used, and an exemplary illumination of the target surface, when an elongated interior aircraft light according to a previous approach is used.
DETAILED DESCRIPTION
[0059] FIG. 1 depicts a schematic side view of an aircraft 100, in particular of an air plane, in accordance with an exemplary embodiment of the invention. In the exemplary embodiment shown in FIG. 1, the aircraft 100 is a large passenger air plane, comprising a cockpit 103 and a passenger cabin 104. The aircraft 100 may be a commercial passenger air plane, a private air plane, or a military aircraft. It is also possible that the aircraft is a rotorcraft, such as a helicopter.
[0060] FIG. 2 shows a schematic longitudinal cross-sectional view of a section of the passenger cabin 104 of the aircraft 100, which is shown in FIG. 1.
[0061] Four seats 81, which are also referred to as passenger seats 81, are visible in FIG. 2. The passenger seats 81 comprise arm rests 82 and are mounted to a floor 120 of the passenger cabin 104. Each of the depicted passenger seats 81 belongs to a different seat row 80a-80d. The seat rows 80a-80d are spaced apart from each other along the longitudinal direction LD of the passenger cabin 104.
[0062] For each of the seat rows 80a-80d, a window 108a-108d is provided, which allows the passengers to view the outside of the aircraft 100. Further, a plurality of overhead baggage compartments 112, which provide storage space for the passengers' baggage, are provided above the passenger seats 81.
[0063] Each seat row 80a-80d may include a plurality of passenger seats 81, for example three passenger seats 81, which are arranged next to each other along a transverse direction TD, which is orthogonal to the longitudinal direction LD. The additional passenger seats, i.e. the middle seats and the window seats, of the seat rows 80a-80d are not visible in FIG. 2, as they are arranged behind and therefore hidden by the depicted aisle seats 81. The hidden passenger seats are visible in FIG. 3, which will be discussed below.
[0064] An aircraft overhead passenger service unit (PSU) 109a-109d is provided above each of the seat rows 80a-80d, respectively.
[0065] One or more elongated interior aircraft lights in accordance with exemplary embodiments of the invention may be arranged in the depicted section of the passenger cabin 104. In particular, there may be one or more aircraft passenger cabin lights, which are examples of elongated interior aircraft lights in accordance with exemplary embodiments of the invention and which are not visible in FIG. 2. The aircraft passenger cabin lights may extend in the longitudinal direction LD behind the aircraft overhead passenger service units 109a-109d and/or behind and/or above the overhead baggage compartments 112. An example of such an elongated interior aircraft light is shown in FIG. 3.
[0066] FIG. 3 depicts a schematic partial cross-sectional view of the passenger cabin 104. The cross-sectional plane of FIG. 3 is oriented in a transverse direction, i.e. orthogonal to the plane of the longitudinal cross-sectional view depicted in FIG. 2.
[0067] FIG. 3 shows a single seat row 80a, which comprises three passenger seats 81, arranged next to each other along the transverse direction TD.
[0068] An overhead baggage compartment 112 and a passenger service unit 109a are installed above the seat row 80a.
[0069] An elongated interior aircraft light 2 in accordance with an exemplary embodiment of the invention is installed above the passenger seats 81. The exemplary elongated interior aircraft light 2 of FIG. 3 is an aircraft passenger cabin light, also referred to as wash light, and is configured for providing general cabin wall illumination.
[0070] The elongated interior aircraft light 2 is arranged at or next to a side wall 120 of the passenger cabin 104 and extends along the longitudinal direction LD of the passenger cabin 104, i.e. it extends orthogonal to the drawing plane of FIG. 3. The exemplary elongated interior aircraft light 2 may extend along a plurality of seat row s 80a along the longitudinal direction LD or may have an extension that is comparable to a single seat row spacing.
[0071] In the following, details of an elongated interior aircraft light 2 according to exemplary embodiments of the invention will be discussed.
[0072] FIG. 4 depicts a portion of a light module 4 according to an exemplary embodiment of the invention in a schematic perspective view. In an elongated interior aircraft light according to an exemplary embodiment of the invention, multiple such light modules 4 may be arranged in a row-type configuration. In other words, multiple such light modules 4 may be arranged along a longitudinal extension of an elongated interior aircraft light according to an exemplary embodiment of the invention. The longitudinal direction of the light module 4 is indicated as longitudinal direction LD in FIG. 4 and may coincide with the longitudinal direction of the elongated interior aircraft light.
[0073] The light module 4 comprises a plurality of light sources 6. In the exemplary embodiment of FIG. 4, the light sources 6 are LEDs. The plurality of light sources 6 are arranged as an array of light sources that extends along the longitudinal direction LD of the light module 4. In the exemplary embodiment of FIG. 4, the plurality of light sources 6 are arranged as a single-file row along the longitudinal direction LD. The plurality of light sources 6 are arranged on an elongated base plate 7. The base plate 7 is a printed circuit board in the exemplary embodiment of FIG. 4.
[0074] The light module 4 further comprises an elongated light transmissive cover 8. In the exemplary embodiment of FIG. 4, the elongated light transmissive cover 8 is an elongated dome-shaped light transmissive cover. It is mounted to the base plate 7 at respective side portions thereof. The elongated light transmissive cover 8 may be mounted directly to the base plate 7 or may be mounted to the base plate 7 via a suitable fixture. It is also possible that both the base plate 7 and the elongated light transmissive cover 8 are mounted to a suitable mounting structure. The light transmissive cover 8 may be made from any suitable light transmissive material, such as transparent material or translucent material.
[0075] The light module 4 as a whole as well as the base plate 7, the array of light sources 6, and the elongated light transmissive cover 8 are elongated structures. In other words, their extensions along the longitudinal direction LD is significantly greater than along a transverse direction TD, which is orthogonal thereto. The large longitudinal extension is indicated via dotted line segments in FIG. 4, which illustrate that the array of light sources 6, the base plate 7, and the elongated light transmissive cover 8 extend further towards the right in the drawing plane of FIG. 4. FIG. 4 is a partial representation of the light module 4.
[0076] The light module 4 has a first lateral end portion 40 and a second lateral end portion, which is not shown in the partial representation of FIG. 4, as it is located outside of the drawing sheet towards the right. At the first lateral end portion 40, a light output boosting lateral end cap 10 is provided. The light output boosting lateral end cap 10 closes an interior space of the light module 4, as provided between the base plate 7 and the elongated dome-shaped light transmissive cover 8, at the lateral end of the elongated structure of the light module 4.
[0077] In the exemplary embodiment of FIG. 4, the light output boosting lateral end cap 10 comprises a side face 16 and a dome-shaped cover surface 18. The dome-shaped cover surface 18 is substantially an extension of the elongated light transmissive cover 8. The side face 16 forms, to a large extent, the lateral end of the light module 4. At the side face 16, a protrusion 12 and a recess 14 are provided. The protrusion 12 acts as a light re-directing element, as will be explained below. The recess 14 is shaped to receive a protrusion of a neighbouring lateral end cap.
[0078] In the exemplary embodiment of FIG. 4, the protrusion 12 has a main plane of extension that is substantially parallel to the base plate 7. Also, the recess 14 has a main plane of extension that is substantially parallel to the base plate 7. In the exemplary embodiment of FIG. 4, the protrusion 12 and the recess 14 are arranged side-by-side in the transverse direction of the light module 4. The protrusion 12 and the recess 14 are arranged substantially at the half of the height of the light output boosting lateral end cap 10. In this way, the protrusion 12 and the recess 14 are spaced somewhat from the base plate 7 and, thus, spaced somewhat from the plurality of light sources 6 in the height dimension of the light module 4.
[0079] Both the elongated light transmissive cover 8 and the light output boosting lateral end cap 10 may be made from transparent material. The elongated light transmissive cover 8 and the light output boosting lateral end cap 10 may be made from silicone or PMMA or other suitable transparent material. It is also possible that only one of the elongated light transmissive cover 8 and the light output boosting lateral end cap 10 is made from transparent material. It is further possible that one or both of the elongated light transmissive cover 8 and the light output boosting lateral end cap 10 is/are made from translucent material.
[0080] FIG. 5 depicts the light output boosting lateral end cap 10 of the light module 4 of FIG. 4 in isolation. FIG. 5 depicts the light output boosting lateral end cap 10 in a similar perspective view as in FIG. 4. Although the light output boosting lateral end cap 10 of FIG. 5 is light transmissive, it is depicted as a solid structure solely for ease of illustration of its outer surfaces.
[0081] In the exemplary embodiment of FIG. 5, an envelope surface of the protrusion 12 is substantially the same as an envelope surface of the recess 14, when disregarding their different positions in the light output boosting lateral end cap 10. Within the framework of the light output boosting lateral end cap 10, the envelope surface of the protrusion 12 is rotationally symmetric with the envelope surface of the recess 14. In particular, the envelope surface of the protrusion 12 can be projected onto the envelope surface of the recess 14 via a 180? rotation around an axis of rotation that is aligned with the height dimension H and that runs along the side face 16 of the light output boosting lateral end cap 10.
[0082] Via the rotational symmetry between the protrusion 12 and the recess 14, it is ensured that the light output boosting lateral end cap 10 of FIG. 5 can mesh with another light output boosting lateral end cap of the same design to such an extent that the side face 16 can come to lie on the side face of the neighbouring light output boosting lateral end cap. A meshing relationship between the light output boosting lateral end cap 10 of FIG. 5 and a neighbouring light output boosting lateral end cap of equal design is possible to various extents. The protrusion 12 and the protrusion of the neighbouring light output boosting lateral end cap may be inserted into the recess of the neighbouring light output boosting lateral end cap and the recess 14, respectively. This insertion may be a partial insertion, having different degrees of insertion, and a full insertion.
[0083] In the exemplary embodiment of FIG. 5, both the protrusion and the recess 14 have a width of about 6 mm, i.e. an extension of about 6 mm in the transverse direction TD, have a lateral extension from the side face 16 of about 3 mm, i.e. an extension in the longitudinal direction LD of about 3 mm, and have a height of about 2 mm, i.e. an extension in the height dimension H of about 2 mm. The light output boosting lateral end cap 10 may have a total width of between 10 mm and 30 mm, in particular of around 20 mm, a total lateral extension of between 8 mm and 25 mm, in particular of around 15 mm, and a total height of between 8 mm and 25 mm, in particular of around 15 mm.
[0084] FIG. 6 depicts the light output boosting lateral end cap 10 of the light module 4 of FIG. 4 in a second schematic perspective view. The second schematic perspective view depicts the portion of the light output boosting lateral end cap 10 that faces the interior space of the light module 4 between the base plate 7 and the elongated light transmissive cover 8. On the interior side of the light output boosting lateral end cap 10, the recess 14, which is depicted as an indentation in the side face 16 in FIG. 5, forms a protrusion into the interior space of the light module 4. Again, solely for ease of illustration of its outer surfaces, the light output boosting lateral end cap 10 is depicted as a solid structure in FIG. 6.
[0085] FIG. 7A depicts a cross-sectional view through the light module 4 of FIG. 4, with the light output boosting lateral end cap 10 being made of transparent material. The cross-sectional plane of FIG. 7A is a longitudinal cross-sectional plane, orthogonal to the transverse direction TD, as indicated in FIG. 4, and runs through the protrusion 12. While the plurality of light sources 6 may be arranged behind said cross-sectional plane, they are depicted in FIG. 7A for a better illustration of the light emission of the light module 4.
[0086] The majority of the light emission from the plurality of light sources 6 exits the light module 4 through the elongated light transmissive cover 8. This portion of the light output is referred to as a forward light output portion 30 herein. The forward light output portion 30 is considered forward, because it leaves the light module 4 towards a target surface, such as towards the cabin wall 120 depicted in FIG. 3, for illumination thereof.
[0087] Another portion of the light emission from the plurality of light sources 6 is incident on the light output boosting lateral end cap 10. This portion of the light output is referred to herein as a lateral light output portion 32. Some light of the lateral light output portion 32 enters the light output boosting lateral end cap 10 and reaches the protrusion 12, while some light of the lateral light output portion 32 travels through the wall-like parts of the light output boosting lateral end cap 10, without interacting with the protrusion 12.
[0088] As indicated above, the protrusion 12 is an implementation of a light re-directing element. Said light re-directing element is configured to re-direct at least some light of the lateral light output portion 32.
[0089] In the exemplary embodiment of FIG. 7A, the protrusion 12 has a rear surface 20 and a front surface 22. The rear surface 20 is oriented towards the plane of extension of the base plate 7, whereas the front surface 22 is oriented towards the target surface of the light module 4. In the exemplary embodiment of FIG. 7A, the front surface 22 is substantially planar. The rear surface 20 of the protrusion 12 is curved, at least in the depicted longitudinal cross-section and in other longitudinal cross-sections along the width of the protrusion 12. In the exemplary embodiment of FIG. 7A, the rear surface 20 is a total internal reflection surface. Some light of the lateral light output portion 32 is incident on said total internal reflection surface and is re-directed to pass along the side face 16 of the light output boosting lateral end cap 10. In this way, an ancillary forward light output portion 34 is provided by the light module 4.
[0090] The ancillary forward light output portion 34 strengthens the light output of an elongated interior aircraft light, which has the light module 4 installed, at a region of the light output where an illumination gap/a low illumination region on the target surface would be present due to the interface between the light module 4 and a neighbouring light module. In other words, the ancillary forward light output portion 34 strengthens the light output of the elongated interior aircraft light at a portion of the target surface where the forward light output portion 30 of the light module 4 and a forward light output portion of a neighbouring light module would leave a gap/a low illumination region on the target surface. Due to the optical effect of the protrusion 12, acting as a light re-directing element that is configured for forming the ancillary forward light output portion 34, the light output boosting lateral end cap 10 has the described light output boosting functionality. The ancillary forward light output portion 32 uses light, which was wasted in previous approaches due to the usage of opaque lateral end caps, for filling gaps or evening out low illumination regions on the target surface. While the light output boosting functionality is described for the two-dimensional cross-section of FIG. 7A, it is understood that the considerations apply to the three dimensions of the light module 4, as given in FIG. 4.
[0091] FIG. 7B depicts a cross-sectional view through the light module 4 of FIG. 4, with the light output boosting lateral end cap 10 being made of translucent material. The view of FIG. 7B is the same as the view of FIG. 7A. In particular, FIG. 7B depicts a longitudinal cross-sectional view through the light module 4, analogous to FIG. 7A.
[0092] In the exemplary embodiment of FIG. 7B, the light output boosting lateral end cap 10 is made of translucent material. In this way, the protrusion 12 is also made of translucent material. Again, the protrusion 12 is an implementation of a light re-directing element. However, as compared to FIG. 7A, the light re-directing mechanism is different. With the protrusion 12 being translucent, at least some light of the lateral light output portion 32 is reflected in different direction within the protrusion 12. When looked at on a high level, the protrusion can be seen to act as a body of diffuse refraction on part of the lateral light output portion 32. This is illustrated in FIG. 7B by three exemplary light rays of the lateral light output portion 32, which are split up between different light output directions. Also with this set-up, some of the light of the lateral light output portion 32 is re-directed to pass along the side face 16 of the light output boosting lateral end cap 10 and to form the ancillary forward light output portion 34.
[0093] While the geometry of the protrusion 12 is shown to be the same in FIG. 7A and FIG. 7B, making the protrusion 12/the light output boosting lateral end cap 10 from translucent material may provide for more design flexibility with respect to the geometry. For example, with the translucent material providing for the re-directing of some light of the lateral light output portion 32, the rear surface 20 may not be used for total internal reflection and may have different geometries, such as a substantially planar shape.
[0094] FIG. 8 depicts the light output boosting lateral end cap 10 of the light module 4 of FIG. 4 in a meshing arrangement with a neighbouring light output boosting lateral end cap 10 of a neighbouring light module. The light output boosting lateral end cap 10 and the neighbouring light output boosting lateral end cap 10 are depicted in a top view, i.e. in a view as seen from the target surface of the elongated interior aircraft light. In the exemplary arrangement of FIG. 8, the protrusion 12 of the light output boosting lateral end cap 10 is partially inserted into a recess of the neighbouring light output boosting lateral end cap 10, and the protrusion 12 of the neighbouring light output boosting lateral end cap 10 is partially inserted into the recess of the light output boosting lateral end cap 10. In this arrangement, both protrusions 12, 12 create a respective ancillary forward light output portion and contribute to achieving a highly even illumination of the target surface, even in a region that is associated with the interface between the light output boosting lateral end cap 10 and the neighbouring light output boosting lateral end cap 10.
[0095] FIGS. 9A and 9B illustrate the illumination of a target surface, comparing a first scenario, where light output boosting lateral end caps are used at the interface of two neighbouring light modules, with a second scenario, where conventional opaque lateral end caps are used. For the exemplary illustration of FIG. 9A, the set-up of the light output boosting lateral end cap 10 and the neighbouring light output boosting lateral end cap 10 of FIG. 8 is assumed. In this case, the ancillary forward light output portions 34, 34 of the two light output boosting lateral end caps 10, 10 even out the illumination of the target surface and strengthen the illumination of the target surface between the forward light output portions 30, 30 of the neighboring light modules. As compared to FIG. 9B, where a noticeable dip between the forward light output portions 30, 30 is present at the interface of two neighboring light modules with opaque lateral end caps, said artefact in the illumination of the target surface is reduced or even completely mitigated in the illumination of the target surface depicted in FIG. 9A.
[0096] While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
