DESC:FIELD OF THE INVENTION

The present disclosure relates to a high bay lighting apparatus with an anisotropic light diffuser.

BACKGROUND

Lighting devices are employed to provide illumination in different types of spaces. One type of lighting device called the high bay lighting device is used to illuminate large spaces, such as office areas, warehouses, hangers, and depots. The high bay lighting devices are generally mounted on a ceiling or may be suspended from the ceiling. The high bay lighting devices have a wide beam angle thereby illuminating a larger area within the space.

Currently known high bay lighting devices have many limitations associated therewith. For instance, the currently known high bay lighting devices result in low lux value/ unit area resulting in low intensity light owing to their wide beam angle result. One of the ways to mitigate this issue is to use a greater number of LEDs for achieving the required lux value. However, adding a greater number of LEDs not only increases the power consumption but also increases the overall size of the lighting device making the lighting device bulky. Further, using a greater number of LEDs also causes thermal dissipation issues. Also, adding an adequately sized heat sink makes the lighting device bulky. Moreover, currently known lighting devices are not capable of providing directed lights at specified regions within the space.

SUMMARY

This summary is provided to introduce a selection of concepts, in a simplified format, that are further described in the detailed description of the invention. This summary is neither intended to identify key or essential inventive concepts of the invention and nor is it intended for determining the scope of the invention.

The present disclosure relates to a lighting apparatus with an anisotropic light diffuser. The anisotropic light diffuser of the present disclosure provides directed light to specific regions. Further, LEDs in the lighting sources have pre-defined pitch therebetween to allow the lighting apparatus to provide required lux value without adding additional LEDs.

In an embodiment, a lighting apparatus is disclosed that includes a housing. The lighting apparatus includes a substrate installed in the housing and has a light source installed thereon. The lighting apparatus also includes a light diffuser installed over the substrate in a predefined orientation with respect to the substrate. The lighting apparatus includes at least one anisotropic light diffuser positioned along a length of the light diffuser. The lighting apparatus is adapted to diffuse the light emitted from the light source in a first direction with respect to the light source. In addition, the light diffuser includes a pair of isotropic light diffuser sandwiching the at least one array of anisotropic light diffuser and adapted to diffuse the light diffuser in a second direction with respect to the light source. In one example, the anisotropic light diffuser has a top surface that generates the main light beam of a predefined beam angle and side light beam of a third predefined beam angle, and a pair of half cylindrical surface extending from edges of the top surface which generates supplemental light beams.

In one example, the light source includes an array of light-emitting diodes (LEDs) that are arranged on the substrate, such that the LEDs are coplanar with the anisotropic light diffuser. In addition, adjacent LEDs have a predefined pitch therebetween to provide optimal distribution of the light via the light diffuser.

According to the present disclosure, the anisotropic diffuser directs the light in a predefined pattern in contrast with the currently known lighting device that provides light having a wide beam angle. The predefined pattern thus enables the targeted lighting to specified regions in the space.

To further clarify advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:

Figure 1 shows a room having racks and a plurality of lighting apparatuses installed overhead the racks, according to an embodiment of the present disclosure;
Figure 2 illustrates a lighting apparatus having an anisotropic light diffuser, according to an embodiment of the present disclosure;
Figure 3 illustrates a side view and a front view of the lighting apparatus, according to an embodiment of the present disclosure;
Figure 4 illustrates the lighting apparatus having a substrate and an array of LEDs mounted thereon, according to an embodiment of the present disclosure;
Figure 5 illustrates a disassembled view of the light diffuser and the substrate, according to an embodiment of the present disclosure;
Figure 6 illustrates a perspective view of the light diffuser having an anisotropic light diffuser and a pair of isotropic light diffusers, according to an embodiment of the present disclosure;
Figure 7 illustrates a front view of the light diffuser and a cross section taken along lines 1-1, according to an embodiment of the present disclosure;
Figure 8 illustrates arrangement of LEDs on the light diffuser, according to an embodiment of the present disclosure; and
Figure 9 illustrates a beam projection having a main light beam, supplemental light beam, and side light beam, according to an embodiment of the present disclosure.

Further, skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and may not have necessarily been drawn to scale. Furthermore, in terms of the construction of the device, one or more components of the device may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.

DETAILED DESCRIPTION OF FIGURES

For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skilled in the art to which invention belongs. The system and examples provided herein are illustrative only and not intended to be limiting.

For example, the term “some” as used herein may be understood as “none” or “one” or “more than one” or “all.” Therefore, the terms “none,” “one,” “more than one,” “more than one, but not all” or “all” would fall under the definition of “some.” It should be appreciated by a person skilled in the art that the terminology and structure employed herein is for describing, teaching, and illuminating some embodiments and their specific features and elements and therefore, should not be construed to limit, restrict, or reduce the spirit and scope of the present disclosure in any way.

For example, any terms used herein such as, “includes,” “comprises,” “has,” “consists,” and similar grammatical variants do not specify an exact limitation or restriction, and certainly do not exclude the possible addition of one or more features or elements, unless otherwise stated. Further, such terms must not be taken to exclude the possible removal of one or more of the listed features and elements, unless otherwise stated, for example, by using the limiting language including, but not limited to, “must comprise” or “needs to include.”

Whether or not a certain feature or element was limited to being used only once, it may still be referred to as “one or more features” or “one or more elements” or “at least one feature” or “at least one element.” Furthermore, the use of the terms “one or more” or “at least one” feature or element do not preclude there being none of that feature or element, unless otherwise specified by limiting language including, but not limited to, “there needs to be one or more...” or “one or more elements is required.”

Unless otherwise defined, all terms and especially any technical and/or scientific terms, used herein may be taken to have the same meaning as commonly understood by a person ordinarily skilled in the art.

Reference is made herein to some “embodiments.” It should be understood that an embodiment is an example of a possible implementation of any features and/or elements of the present disclosure. Some embodiments have been described for the purpose of explaining one or more of the potential ways in which the specific features and/or elements of the proposed disclosure fulfil the requirements of uniqueness, utility, and non-obviousness.

Use of the phrases and/or terms including, but not limited to, “a first embodiment,” “a further embodiment,” “an alternate embodiment,” “one embodiment,” “an embodiment,” “multiple embodiments,” “some embodiments,” “other embodiments,” “further embodiment”, “furthermore embodiment”, “additional embodiment” or other variants thereof do not necessarily refer to the same embodiments. Unless otherwise specified, one or more particular features and/or elements described in connection with one or more embodiments may be found in one embodiment, or may be found in more than one embodiment, or may be found in all embodiments, or may be found in no embodiments. Although one or more features and/or elements may be described herein in the context of only a single embodiment, or in the context of more than one embodiment, or in the context of all embodiments, the features and/or elements may instead be provided separately or in any appropriate combination or not at all. Conversely, any features and/or elements described in the context of separate embodiments may alternatively be realized as existing together in the context of a single embodiment.

Any particular and all details set forth herein are used in the context of some embodiments and therefore should not necessarily be taken as limiting factors to the proposed disclosure.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

For the sake of clarity, the first digit of a reference numeral of each component of the present disclosure is indicative of the Figure number, in which the corresponding component is shown. For example, reference numerals starting with digit “1” are shown at least in Figure 1. Similarly, reference numerals starting with digit “2” are shown at least in Figure 2.

Figures 1 to 3 illustrate various aspects of a lighting apparatus 200, according to an embodiment of the present disclosure. Specifically, Figure 1 shows a room 100 having racks 100A, 100B, 100C and a plurality of lighting apparatuses 200 installed overhead the racks 100A, 100B, 100C. Figure 2 illustrates a perspective view of the lighting apparatus 200 while Figure 3 illustrates a side view and a front view of the lighting apparatus 200. The lighting apparatus 200 is a high bay lighting device adapted to provide lighting to large-sized spaces, such as warehouses. The lighting apparatus 200 may be suspended from a ceiling of the room 100 to be illuminated. Further, the lighting apparatus 200 is designed to provide dedicated illumination in different regions in the room 100. The lighting apparatus 200 is designed to customize illumination in regions that do not require a high level of lux values. The lighting apparatus 200 may include a housing 202 and a light diffuser 204 mounted on the housing 202, details of which will be shared in subsequent paragraphs.

Figures 3 and 4 shows details of the housing 202. Specifically, Figure 3 illustrates a side view and a front view of the lighting apparatus 200 while Figure 4 illustrates a front view of the lighting apparatus 200 having a substrate 206 installed in the housing 202 and a light source 208 installed on the substrate 206.

The housing 202 may form as a casing of the lighting apparatus 200. The housing 202 may be made of a plastic material using the injection moulding technique. The housing 202 may have a cavity that houses the substrate 206. The housing 202 may be sized to house a driver board (not shown) to power the light source 208. The housing 202 may have a cylindrical body may include a hook 223 to suspend the housing 202 from the ceiling. The housing 202 may include a first flange 222A disposed around an open-end 202A of the housing 202. The first flange 222A may be used to couple the light diffuser 204 thereon. In one example, the first flange 222A may be formed as a part of the cylindrical body of the housing 202. Similarly, the light diffuser 204 may have a circular body that may be attached to the open end 202A of the housing 202.

Figure 5 shows the substrate 206 with the light source 208 installed thereon. The substrate 206, in one example, maybe a printed circuit board (PCB), such that the light source 208 may be soldered on the PCB. The substrate 206 may include holes 214 that may receive fasteners to secure the substrate 206 to the housing 202 shown in Figure 1. Further, each set of horizontal holes 214 is separated by a distance D1 and holes 214 in each horizontal set are separated by distance D2. In one example, the distances D1 and D2 maybe 141.4 mm. The distances D1 and D2 may depend on various factors, like sizes of the housing 202, the substrate 206, among other examples. In one example, the light source 208 may be in the form of arrays of light-emitting diodes (LEDs) 216. The arrays of the LEDs 216 may be arranged vertically along a width of the substrate 206, such that the arrays of LEDs 216 may form a grid on the substrate 206. In one example, the number of LEDs 216 may be 60 and the array of LEDs 216 may have a predefined spacing S1 therebetween. Further, the corner most arrays 208A, 208B of LEDs 216 may be spaced at S2 from the edges of the substrate 206. The spacing S1 may be provided so that the light diffuser 204 may be aligned with the light diffuser 204. In one example, the spacing S1 may be 35 mm while the spacing S2 may be 39.5 mm.

In one example, each LED 216 in the array is arranged in a predefined orientation. Further, adjacent LEDs 216 in each array may have a predefined width or pitch P therebetween. As shown in Figure 4, the LEDs 216 in all the parallel arrays have the same pitch P which enables the light source 208 to achieve maximum lux value for defined power input. For instance, the pitch P to achieve maximum lux value for lumen wattage 150W input is 20mm. The optimum pitch P may also enable the lighting apparatus 200 to use fewer number of LEDs 216 making the lighting apparatus 200 compact while achieving maximum light energy for illumination and direction by the light diffuser 204.

Figures 6 and 7 show different views of the light diffuser 204. Specifically, Figure 6 illustrates a perspective view of the light diffuser 204 while Figure 7 illustrates the front view of the light diffuser 204 and a cross-section of the light diffuser 204 taken along lines 1-1 of the front view. The light diffuser 204 may be in the form of a transparent disc that may be different cross-sectional structures across the width of the light diffuser 204. The light diffuser 204 may include one or more anisotropic light diffuser 218, a pair of isotropic light diffuser 220, and a second flange 222B around the anisotropic light diffusers 218 and the pair of isotropic light diffusers 220. The second flange 222B may be disposed around the light diffuser 204 and may be adapted to engage with the first flange 222A to secure the light diffuser 204 to the housing 202. The second flange 222B may also include holes to receive fasteners 221 to secure the light diffuser 204 to the housing 202 (shown in Figure 3).

Referring to Figure 7, the light diffuser 204 may include a base 224 and a top plate 226. Further, the base 224 may be proximate to the substrate 206 when assembled and the top plate 226 may face outwardly from the lighting apparatus 200. In one example, the top plate 226 may be supported to the base 224 using pillars 228. The top plate 226 may include the anisotropic light diffusers 218 while the pair of isotropic light diffuser 220 may extend from the base 224. Each isotropic light diffuser 220 may include a top surface 220A facing forward and a side wall 220A that may face towards the anisotropic light diffuser 218. In one example, the side walls 220A may produce light beams different from the light beams generated by the anisotropic light diffuser 218.

In one example, the anisotropic light diffusers 218 may diffuse the light emitted from the light source 208 in a first direction with respect to the light source 208. Further, each anisotropic light diffusers 218 may be in the form of a top surface 230 and a pair of half cylindrical surface 232 extending from edges of the top surface 230. Further, half cylindrical surface 232 of adjacent anisotropic light diffusers 218 may be attached at their respective bottom edges, such that the top surface 230 forms the crest while joining edges of the half cylindrical surface 232 forms the trough.

On the other hand, the pair of isotropic light diffusers 220 may sandwich the anisotropic light diffusers 218. The isotropic light diffusers 220 are adapted to diffuse the light in a second direction with respect to the light source 208. Further, the isotropic light diffuser 220 may have a mesh grill to enable homogenous diffusion of light. As shown in the cross-section in Figure 6, a height H1 of each isotropic light diffuser 220 from the base 224 of the light diffuser 204 is greater than a height H2 of at least one anisotropic light diffuser 218 from the base 224. The greater height of the isotropic light diffuser 220 may enable better the light diffuser 204 to provide light for different regions of the room 100.

Figure 8 illustrates the orientation of the light source 208 with respect to the light diffuser 204, according to an embodiment of the present disclosure. The light diffuser 204 may be installed over the substrate 206 at a predefined orientation with respect to the light source 208 mounted on the substrate 206. According to the present disclosure, the combination of the pitch P (shown in Figure 5) between adjacent LEDs 216 and the orientation of the light diffuser 204 with respect to the substrate 206. In one example, the light diffuser 204 is aligned in such a way that the array of LEDs 216 is co-planar with the anisotropic light diffuser 218. In addition, the isotropic light diffuser 220 may also be co-planar with the corner most arrays 208A, 208B of the LEDs 216. Such an orientation allows the lighting apparatus 200 to different sized light beams in different directions. Further, in order to align the light diffuser 204 and the substrate 206, the light diffuser 204 may include a reference arrow A1 shown in Figure 6 and the substrate 206 may include a similar reference arrow A2. While assembly, a user may match the directions of reference arrows A1 and A2 to align the substrate 206 and the light diffuser 204 during the assembling of the lighting apparatus 200.

As mentioned before, the anisotropic light diffuser 218 and the isotropic light diffuser 220 provide light in different directions. In addition, the anisotropic light diffuser 218 and the isotropic light diffuser 220 may provide light beams of different beam angles that provide illumination in different regions in the room 100. Figure 9 shows beam projections 900 of different light beams produced by the anisotropic light diffuser 218 and the isotropic light diffuser 220. In one example, the top surface 230 of the anisotropic light diffuser 218, owing to its optical property, may generate a main light beam 902 of a first predefined beam angle A1. Moreover, the top surface 230 may also generate a side light beam 906 of a third predefined beam angle A3. In one example, the first predefined beam angle A1 may range from 0 degrees to 30 degrees on either side of the axis X-X. As an example, in case the lighting apparatus 200 is installed between two racks in a warehouse shown in Figure 1, the main light beam 902 may illuminate both the space between the racks 100A and 100B and also the racks 100A, 100B. Further, the side walls 220B of the isotropic light diffuser 220, owing to their optical property generate supplemental light beams 904 on either side of the main light beam 902 of the second predefined beam angle A2 with respect to the axis A1. The supplemental light beams 904 may provide illumination to upper sections of the racks 100A, 100B.

On the other hand, the half cylindrical surface 232 of the anisotropic light diffuser 218, owing to its optical property, produce side light beams 906 in on either side of the main beam 902 and the supplemental light beam 906 of a third predefined beam angle A3 with respect to the axis A1. In addition, the half cylindrical surface 232 is also configured to produce the main light beam 902. In other words, the whole surface of anisotropic light diffuser 218 generate both the light beam 902 and side light beam 906. In one example, the third predefined beam angle may be in the range of 60 degrees to 220 degrees. The side light beams 906 may illuminate the tops of the racks 100A, 100B, 100C.

According to the present disclosure, the light beams 902, 904, and 906 allows the lighting apparatus 200 to provide lighting to the dedicated section to the racks 100A, 100B, 100C installed in the room 100. As a result, the light emitted by the light source 208 may be better directed to the section within the room 100 instead of homogenous illumination. Moreover, dedicated illumination allows for better achievement of lux value resulting in brighter illumination. Moreover, the pitch between the adjacent LEDs 216 also results in better emission of the light from the light source 208.

While specific language has been used to describe the present disclosure, any limitations arising on account thereto, are not intended. As would be apparent to a person in the art, various working modifications may be made to the method in order to implement the inventive concept as taught herein. The drawings and the foregoing description give examples of embodiments. Those skilled in the art will appreciate that one or more of the described elements may well be combined into a single functional element. Alternatively, certain elements may be split into multiple functional elements. Elements from one embodiment may be added to another embodiment. ,CLAIMS:WE CLAIM:
1. A lighting apparatus (200) comprising:
a housing (202);
a substrate (206) installed in the housing (202) and having a light source (208) installed thereon;
a light diffuser (204) installed over the substrate (206) in a predefined orientation with respect to the light source (208), the light diffuser (204) comprising:
at least one anisotropic light diffuser (218) positioned along the length and adapted to diffuse the light emitted from the light source (208) in a first direction with respect to the light source (208).

2. The lighting apparatus (200) as claimed in claim 1, wherein the at least one anisotropic light diffuser (218) comprising:
a top surface (230); and
a pair of half cylindrical surface (232) extending from edges of the top surface (230), wherein the top surface (230) and the pair half cylindrical surface (232) generate
a main light beam (902) of a first predefined beam angle (A1),
supplemental light beams (904) of a second predefined beam angle (A2), and
side light beams (906) of a third predefined beam angle (A3).

3. The lighting apparatus (200) as claimed in claim 1, wherein the light diffuser (204) comprising:
a pair of isotropic light diffuser (220) having side walls (220B) sandwiching the at least one anisotropic light diffuser (218) and adapted to diffuse the light in a second direction with respect to the outer surface of the light source (208).

4. The lighting apparatus (200) as claimed in claim 3, wherein each isotropic light diffuser (220) includes a mesh grill.

5. The lighting apparatus (200) as claimed in claim 1, wherein the at least one light source (208) includes an array of Light Emitting Diodes (LEDs) (216) that is co-planar with the at least one anisotropic light diffuser (218).

6. The lighting apparatus (200) as claimed in claim 5, wherein the array has a predefined pitch (P) between adjacent LEDs (216).

7. The lighting apparatus (200) as claimed in claim 3, wherein a height (H1) of each isotropic light diffuser (220) from a base (224) of the light diffuser (204) is greater than a height (H2) of the at least one anisotropic light diffuser (218) from the base (224).

8. The lighting apparatus (200) as claimed in claim 1, comprising:
a first flange (222A) disposed in the housing (202); and
a second flange (222B) around the light diffuser (204) and adapted to engage with the first flange to secure the light diffuser (204) to the housing (202).

9. The lighting apparatus (200) as claimed in claim 8, wherein the first flange (222A) and the second flange (222B) are attached with each other using fasteners (221).

10. The lighting apparatus (200) as claimed in claim 1, wherein the light diffuser (204) comprising a base (224) proximate to the substrate (206).