Radar transparent structure for illuminated signs

Abstract

The invention provides a multi-layer radome with illuminated indicia. The multi-layer radome may include an overmolded applique, a lighting assembly, and a waveguide. The waveguide may be located between the lighting assembly and the overmolded applique. The waveguide may be configured to transmit light from the lighting assembly to the overmolded applique. The light from the illumination assembly can illuminate the overmolded applique, resulting in an illuminated indicia. The multi-layer radome can adopt a double-layer structure.

Description

Background of the Invention

[0002] The present invention relates to (a) reducing radar interference components in a multi-layer radome having illuminated indicia and (b) improving radar transparency of a multi-layer radome.

[0003] Radar transceivers are often used on the front of automotive vehicles for safety and other functions. Specifically, 77GHz radar (millimeter wave) transceivers are often used. The best location for the transceiver is the front center of the grille of an automotive vehicle. These transceivers are bulky and unsightly, so they are usually and preferably hidden behind a radar transparent logo in the grille. In recent years, illuminated grille logos or emblems have become popular. Therefore, there is a need for a grille logo that is both radar transparent and can be illuminated.

[0004] Combining radar transparency and illuminated logo construction is limited by performance and cost. Illuminated logos require additional layers of material compared to non-illuminated logos. Radar transparency decreases with each additional layer in a multi-layer radome. Current illuminated logo assemblies consist of three layers: an overmolded applique, a waveguide, and a housing. All three layers are located between the radar source and the outside air. Summary of the invention

[0005] In one aspect, a multilayer radome is provided. The multilayer radome may include an overmolded decal, a lighting assembly, and a waveguide. The waveguide may be located between the lighting assembly and the overmolded decal. The waveguide may be configured to transmit light from the lighting assembly to the overmolded decal.

[0006] In one aspect, a multilayer radome is provided. The multilayer radome may include an overmolded decal, a lighting assembly, and a waveguide. The waveguide may be located between the lighting assembly and the overmolded decal. The waveguide may be configured to transmit light from the lighting assembly to the overmolded decal. A gasket may be located between the waveguide and the lighting assembly. The gasket may be configured to seal the connection between the waveguide and the lighting assembly. A decorative border may be configured to couple the overmolded decal, the waveguide, and the lighting assembly together in a fixed manner. A ventilation sheet configured to remove thermal energy from the multilayer radome may be coupled to the lighting assembly. The multilayer radome may include a mating connector configured to secure the multilayer radome to a radar source.

[0007] In one aspect, a multilayer radome is provided. The multilayer radome may include an overmolded decal, a lighting assembly, and a waveguide. The waveguide may be located between the lighting assembly and the overmolded decal. The waveguide may be directly exposed to the interior of the multilayer radome. The waveguide may be configured to transmit light from the lighting assembly to the overmolded decal. The overmolded decal may directly overlap the waveguide.

[0008] These and other objects, advantages and features of the invention will be more fully understood and appreciated by reference to the present description of the various aspects and drawings.

[0009] Before describing in detail various aspects of the present invention, it should be understood that the present invention is not limited to the details of the operation or the details of the construction and the arrangement of the parts set forth in the following description or shown in the accompanying drawings. The present invention can be implemented in various other aspects and can be practiced or executed in alternative ways not explicitly disclosed herein. In addition, it should be understood that the terms and terms used herein are for the purpose of description and should not be considered as limiting. The use of "include" and "comprise" and its variants is intended to cover the equivalents of the items listed thereafter and the items listed thereafter and the equivalents of the additional items and the additional items. In addition, enumeration can be used in the description of various aspects. Unless otherwise explicitly stated, the use of enumeration should not be interpreted as limiting the present invention to any specific order or number of parts. The use of enumeration should not be interpreted as excluding any additional steps or parts that may be combined with or combined into the steps or parts listed from the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication in color will be provided by the Office upon request and payment of the necessary fee.

[0011] FIG. 1 is an exploded perspective view of a prior art multi-layer radome with illuminated insignia.

[0012] 2 is a representative view of the overmolded decal, waveguide, and shell of the prior art multi-layer radome of FIG. 1 with illuminated insignia.

[0013] Figure 3 is an exploded perspective view of a multi-layer radome with illuminated indicia according to one aspect.

[0014] Figure 4 yes Figure 3 Representation of the overmolded decal, waveguide, and lighting assembly of a multi-layer radome with illuminated logo.

[0015] Figure 5is a graph of radar transparency versus material thickness.

[0016] Figure 6 is a detailed view of an overmolded decal and waveguide of a multi-layer radome with an illuminated logo according to one aspect.

[0017] Figure 7 is a graph of the thickness of the overmolded decal versus the thickness of the waveguide. DETAILED DESCRIPTION

[0018] Throughout the disclosure, the term "symbol" refers to a mark or character used as a conventional representation of an object, function or process. The term "symbol" covers at least logos, logos, trademarks and designs.

[0019] Throughout this disclosure, the term "layer" refers to any material that is thick enough to significantly attenuate millimeter wave radar signals.

[0020] 1-2 illustrate the structure of a multilayer radome with an illuminated logo of the prior art. In FIG. 1 , a multilayer radome 100 with an illuminated logo of the prior art is shown. The multilayer radome 100 shown in FIG. 1 is an example of a three-layer structure because there are three layers 110, 120, 130 between the radar source 160 and the outer edge of the multilayer radome 100. The radar source 160 (as shown in FIG. 2 ) can be a radar transceiver, a radar transmitter, or a radar receiver. The outer layer 110 can be alternately referred to as an overmolded decal, decal, graphic, logo, or lens. As depicted, the overmolded decal 110 includes two components: an overmolded portion 112 and a printed graphic film portion 114. In another aspect, the overmolded decal 110 can be formed of a single component or more than two components. The process of manufacturing the overmolded decal 110 can include injection overmolding, painting, printing, laser etching, and vacuum deposition.

[0021] The intermediate layer 120 may also be referred to alternately as a waveguide or light pipe. The waveguide 120 transmits light from the lighting assembly 140 to the overmolded decal 110, which then redistributes the light in a desired pattern. The lighting assembly 140 may include a printed circuit board ("PCB") and one or more lighting elements, such as light emitting diodes ("LEDs"). As depicted, the lighting assembly 140 is annular in shape, which prevents the lighting assembly 140 from interfering with radar waves emitted from the radar source. In addition, the annular shape of the lighting assembly 140 may prevent the lighting assembly 140 from becoming an additional layer in the multi-layer radome 100. In one aspect, the lighting assembly 140 may include a heat sink or heat sink to help remove heat energy from the lighting element.

[0022] The inner layer 130 may be alternately referred to as a shell or substrate. The overmolded decal 110, waveguide 120, and lighting assembly 140 may be secured to the shell 130. In some aspects, the shell 130 may be directly connected to the vehicle via a radar source 160. In other aspects, the shell 130 may be connected to the vehicle via one or more intermediate couplers. As depicted, the multilayer radome 100 includes a radiator 150 coupled to the shell 130. In one aspect, the radiator 150 may be made of cast aluminum. The radiator 150 takes heat away from the shell 130. As depicted, the radiator 150 is annular in shape to avoid interfering with the radar source 160. As depicted, the multilayer radome 100 includes a vent 152 coupled to the shell 130 that takes heat away from the shell 130.

[0023] Radar transparency is determined by the material properties and the thickness of one or more layers. If there are multiple layers, the overall radar transparency is determined by the combination of these materials and layer thicknesses. To achieve high radar transparency, the selected material should have low absorption losses. Absorption losses are also often referred to as dissipation constant or complex permittivity. However, the optimal value of the real part of the permittivity depends on the thickness of the material. Conversely, the optimal thickness of a material depends on the permittivity of the material. The best situation occurs when the primary reflected wave is cancelled by the secondary wave.

[0024] like Figure 5 As shown, as the thickness of the layer increases, the transparency changes cyclically from high transparency to low transparency, while the maximum possible transparency decreases with increasing thickness. When air gaps and additional layers are introduced into the system, achieving radar transparency becomes extremely complex. A solution with minimal thickness, small air gaps, and a minimum number of layers helps achieve radar transparency compared to thicker materials, more layers, and more air gaps.

[0025] FIG2 is a schematic diagram of the multi-layer radome 100 of FIG1 , showing a three-layer structure. The figure shows that a radar source 160 emits a radar wave 162. The radar wave 162 passes through the shell 130, the waveguide 120, and the overmolded decal 110.

[0026] Figure 3An exploded perspective view of a multilayer radome 200 with an illuminated sign according to one aspect is depicted. The multilayer radome 200 may also be referred to alternately as an antenna shield. As depicted, the multilayer radome 200 includes an overmolded decal 210, an illumination assembly 240, a waveguide 220, a housing 230, a decorative border 270, a gasket or seal 280, a mating connector 290, and a vent 252. In another aspect, the multilayer radome 200 may include only the overmolded decal 210, the illumination assembly 240, and the waveguide 220. In one aspect, the multilayer radome 200 may be mounted at an angle of 15° relative to a plane parallel to the radar source 260. In one aspect, the multilayer radome 200 may be mounted at an angle of 0° to 30° relative to a plane parallel to the radar source 260. Attenuation is affected by the mounting angle, and the multilayer radome 200 may extend the range of allowable mounting angles compared to the prior art. In other words, the multilayer radome 200 can have a wider range of mounting angles to achieve acceptable attenuation. Mounting angles between 0° and 30° can allow the same multilayer radome 200 to be used in a variety of vehicle types. For example, a sports car can have a mounting angle of 30°, while a sports utility vehicle (SUV) can have a mounting angle of 0°.

[0027] The multi-layer radome 200 is a double-layer structure, which means that the radar source 260 (such as Figure 4 There are only two layers 210, 220 between the double-layer multilayer radome 200 and the outside air (shown). The two layers are the waveguide 220 and the overmolded decal 210. Compared to the prior art three-layer multilayer radome 300, the double-layer multilayer radome 200 has improved radar transparency performance because there are fewer layers that affect radar transparency. The multilayer radome 200 has high radar transparency while also being cost-effective, in part because the number of radar transparent layers is reduced.

[0028] The waveguide 220 is located between the lighting assembly 240 and the overmolded decal 210. The waveguide 220 may be alternately referred to as a light pipe. The overmolded decal 210 may be alternately referred to as an A surface layer. As depicted, the overmolded decal 210 includes a radar transparent film and an overmolded polycarbonate ("PC"). In one aspect, the overmolded decal 210 may be made of poly(methyl methacrylate) ("PMMA") or any other transparent polymer. In one aspect, the radar transparent film may be printed and vacuum formed. In one aspect, the radar transparent film may be printed, laser etched, or injection overmolded. The overmolded transparent polymer may include an ultraviolet ("UV") hard coating. In another aspect, the overmolded decal 210 may be a single component structure. In another aspect, the overmolded decal 210 may include three or more components.

[0029] The overmolded decal 210 can directly overlap the waveguide 220. The waveguide 220 can be configured to transmit light from the lighting assembly 240 to the overmolded decal 210. In one aspect, the waveguide 220 can transmit light from the lighting assembly 240 to the overmolded decal 210 in a desired pattern. The light from the lighting assembly 240 can illuminate the overmolded decal 210, thereby producing an illuminated sign. The overmolded decal 210 can include a sign. Portions of the sign that are not intended to be illuminated can have a low light transmission rate so that only the portions that are intended to be illuminated appear illuminated. The overmolded decal 210 can have Lambertian radiation so that the sign appears to be uniformly illuminated. In one aspect, the illumination of the multilayer radome 200 can be greater than 2,500 candelas per square meter (cd / m 2 In one aspect, the overmolded decal 210 can change the color emitted from the multilayer radome 200 as compared to the color emitted by the lighting assembly 240 .

[0030] As depicted, the gasket 280 is located between the waveguide 220 and the lighting assembly 240. The gasket 280 can seal the connection between the waveguide 220 and the lighting assembly 240. In one aspect, the gasket 280 can form a fixed air gap between the waveguide 220 and the lighting assembly 240. In an alternative aspect, the waveguide 220 can be directly coupled to the lighting assembly 240. In another aspect, there can be an air gap between the waveguide 220 and the lighting assembly 240. In one aspect, the gasket 280 can be made of a sulfur-free material.

[0031] The waveguide 220 may include multiple components, such as Figure 4As shown. The waveguide 220 may include a waveguide layer 222 and a light blocking backing 224 coupled to the waveguide layer 222. The light blocking backing 224 makes the multi-layer radome 200 a two-layer solution instead of a three-layer solution. In other words, the light blocking backing 224 may be so thin that it does not produce significant attenuation to millimeter wave radiation (it is not a layer), while the shell 130 of the prior art radome 100 is thick enough that it can be adjusted and optimized to achieve minimum attenuation (it is a layer), but the attenuation is still greater than the attenuation of the light blocking backing 224. The light blocking backing 224 is part of the waveguide 220, not its own independent layer. In one aspect, the light blocking backing 224 is a white film. The thickness of the light blocking backing 224 is set to be less than the waveguide layer 222. In one aspect, the light blocking backing 224 can be as thin as at most one-tenth of the waveguide layer 222. In one aspect, the waveguide layer 222 is 2.25 mm thick and the light blocking backing 224 is 0.125 mm thick. The waveguide 220 can be directly exposed to the interior 202 of the multilayer radome 200. In one aspect, the waveguide 220 can be made of molded PC material and include a hot pressed white pattern. In one aspect, the waveguide layer 222 can be made of PMMA.

[0032] like Figure 3 As depicted, the lighting assembly 240 is annular in shape, which prevents the lighting assembly 240 from interfering with radar waves emitted from the radar source 260. In other words, the annular shape of the lighting assembly 240 can prevent the lighting assembly from becoming an additional layer in the multi-layer radome 200. In one aspect, the lighting assembly 240 can be a device constructed according to U.S. Patent No. 7,909,482, entitled "Electrical Device Having Boardless Electrical Component Mounting Arrangement" issued on March 22, 2011. In one aspect, the lighting assembly 240 can include a plurality of LEDs. In one aspect, each LED can emit at least 31 lumens. In one aspect, the left front lighting device can be used to control the illumination of the left side of the overmolded decal 210, and the right front lighting device can be used to control the illumination of the right side of the overmolded decal 210. The ventilation member 252 can be connected to the lighting assembly 240. The ventilation member 252 is configured to remove heat energy from the multi-layer radome 200. In one aspect, the vent 252 is a vent patch.

[0033] like Figure 4Schematically shown in FIG. 2 , the multilayer radome 200 is coupled to a radar source 260. In one aspect, the multilayer radome 200 can be directly coupled to the radar source 260. In another aspect, the multilayer radome 200 can be coupled to another component that is coupled to the radar source 260. For example, the multilayer radome 200 can be coupled to a vehicle grille cover. In one aspect, the lighting assembly 240 can be coupled to the radar source 260. Figure 3 As depicted, the lighting assembly 240 can be coupled to the radar source 260 via a mating connector 290. The mating connector 290 can be configured to secure the multi-layer radome 200 to the radar source 260. In another aspect, the lighting assembly 240 can be coupled to the radar source 260 via any other suitable means. In another aspect, a different component (e.g., a housing) of the multi-layer radome 200 can be coupled to the radar source 260.

[0034] like Figure 4 As depicted, radar waves 262 emitted from or returned to radar source 260 pass through waveguide 220 and overmolded applique 210. Useful radar waves 262 do not pass through lighting assembly 240.

[0035] The decorative border 270 can be configured to couple the overmolded decal 210, the lighting assembly 240, and the waveguide 220 together. In one aspect, the decorative border 270 couples the overmolded decal 210, the lighting assembly 240, and the waveguide 220 together in a fixed manner. As depicted, the decorative border 270 is coupled to the lighting assembly 240. In another aspect, the decorative border 270 can be coupled to any other component of the multilayer radome 200, such as a shell. As depicted, the decorative border 270 is annular in shape to avoid interfering with the radar source 260. In addition, the annular shape of the decorative border 270 can minimize interference with the overmolded decal 210 and any logo included thereon. In one aspect, the decorative border 270 can be made of PMMA.

[0036] The overall transparency of the double-layer radome 200 is determined by the combination of the thickness of each layer and the dielectric constant of each material. It is important to consider the interaction of the two layers in the multi-layer radome 200 rather than determining the transparency of each layer as a separate layer. Figure 7 As shown, the region of maximum transparency 400 is located at a particular combination of layer thicknesses. Figure 7 The thickness of the waveguide 220 along the x-axis and the thickness of the overmolded decal 210 along the y-axis are shown. In one aspect, the multilayer radome 200 can weigh less than 360 grams.

[0037] Figure 6A detailed view of an overmolded decal 310 and waveguide 320 of a multilayer radome with an illuminated logo is shown according to one aspect. In one aspect, the overmolded decal 310 is 2.375 millimeters thick and the waveguide 320 is 2.425 millimeters thick. In one aspect, the overmolded decal 310 and waveguide 320 can be made of a material with low absorption losses.

[0038] The waveguide 320 may include a waveguide layer 322 and a light blocking backing 324. In one aspect, the thickness of the waveguide 320 is preferably between 2 mm and 2.5 mm, because it is thick enough to couple with most white LEDs. This thickness range is also thin enough so that the waveguide 320 can be formed with a fairly small radius without losing its waveguide properties. In one aspect, the waveguide layer 322 can be made of PC material. In one aspect, the waveguide layer 322 is 2.25 mm thick. In one aspect, the light blocking backing 324 can be made of a white PC film. In one aspect, the light blocking backing 324 is 0.125 mm thick. The waveguide layer 322 and the light blocking backing 324 can be connected by an interface 326. In one aspect, the interface 326 is 0.05 mm thick.

[0039] As depicted, overmolded decal 310 includes a black portion 312, an illuminated portion 314, and a "chrome" portion 316. In one aspect, overmolded decal 310 may include at least one of black portion 312, illuminated portion 314, and chrome portion 316. Black portion 312 may include outer surface 318, overmold 311, and base film 317 with ink 319 on top and bottom surfaces. Illuminated portion 314 may include outer surface 318, overmold 311, and base film 317 with ink 319 on only the top surface. Chrome portion 316 may include outer surface 318, overmold 311, protective layer 313, chrome film 315, and base film 317 with ink 319 on top and bottom surfaces.

[0040] The overmolded decal 310 may include an outer surface 318. In one aspect, the outer surface 318 may be a UV hard coating. In one aspect, the outer surface 318 is 0.005 mm thick. The outer surface 318 may be coupled to the overmold 311. In one aspect, the overmold 311 may be made of a PC material. In one aspect, the overmold 311 is 1.98 mm thick. The overmold 311 may be coupled to a protective layer 313. In one aspect, the protective layer 313 may be made of a PC material. In one aspect, the protective layer 313 is 0.125 mm thick. The protective layer 313 may be coupled to a chrome film 315. In one aspect, the chrome film 315 may be made of a polyethylene terephthalate ("PET") material. In one aspect, the chrome film 315 is 0.125 mm thick. The chrome film 315 may be coupled to a base film 317. The base film 317 has ink 319 on the top surface, the bottom surface, both the top surface and the bottom surface, or no ink 319 on both surfaces. In one aspect, the base film 317 can be made of PC material. In one aspect, the base film 317 is 0.14 mm thick.

[0041] As depicted, there is an air gap 308 between the overmolded decal 310 and the waveguide 310. In one aspect, the air gap is 0.25 millimeters thick.

[0042] The multilayer radomes described herein can be used anywhere a radome would benefit from being illuminated. For example, the multilayer radomes can be used anywhere a radar transceiver is located on a vehicle (e.g., other than the front grille); non-automotive vehicles such as heavy trucks, powersports vehicles, and agricultural vehicles; and other markets where radar transceivers are used.

[0043] Terms such as "preferably", "usually" and "typically" when used herein are not intended to limit the scope of the invention or to imply that certain features are critical, necessary or even important to the structure or function of the invention. Instead, these terms are merely intended to identify specific aspects of one aspect of the present disclosure or to emphasize alternative or additional features that may or may not be used in a specific aspect of the present disclosure.

[0044] For the purposes of describing and defining the present invention, it should be noted that the terms "substantially," "about," and "approximately" are used herein to represent the inherent degree of uncertainty that may be attributed to any quantitative comparison, value, measurement, or other representation. The terms "substantially," "about," and "approximately" are also used herein to represent the degree by which a quantitative representation may vary from a stated reference without resulting in a change in the basic function of the subject matter at issue.

[0045] Features from each aspect may be used in combination with features from other aspects. Directional terms such as "vertical", "horizontal", "top", "bottom", "front", "rear", "upper", "lower", "interior", "inward", "exterior", "outward", "forward", and "backward" are used to help describe the invention based on the orientation of the aspects shown in the diagrams. The use of directional terms should not be interpreted as limiting the invention to any particular orientation or orientations. Any reference to a claim element in the singular, such as the use of the articles "a", "an", "the", or "said", should not be interpreted as limiting the element to the singular.

[0046] The subject matter of the present disclosure has been described in detail with reference to specific aspects of the present disclosure, and it should be noted that the various details disclosed herein should not be understood to imply that these details relate to elements that are essential components of the various aspects described herein, even if specific elements are shown in each of the drawings accompanying the present description. In addition, it is apparent that modifications and variations are possible without departing from the scope of the present invention. More specifically, although some aspects of the present disclosure are identified herein as being preferred or particularly advantageous, it is contemplated that the present disclosure is not necessarily limited to these aspects.

Claims

1. A multi-layer radome, comprising: Over-molded decals. Lighting components; as well as A waveguide between the lighting assembly and the overmolded decal, wherein the waveguide is configured to transmit light from the lighting assembly to the overmolded decal.

2. The multi-layer radome according to claim 1, wherein: The lighting assembly is in a ring shape.

3. The multi-layer radome according to claim 2, wherein: The lighting assembly is coupled to a radar source.

4. The multi-layer radome according to claim 1, wherein: The overmolded decal and the waveguide are made of a material having low absorption losses.

5. The multilayer radome according to claim 1, wherein the waveguide comprises: waveguide layer; as well as A light blocking backing coupled to the waveguide layer, wherein the light blocking backing is at most one-tenth as thin as the waveguide layer.

6. The multi-layer radome according to claim 5, wherein: The waveguide layer was 2.25 mm thick and the light blocking backing was 0.125 mm thick.

7. The multi-layer radome according to claim 1, wherein: The overmolded decal was 2.375 mm thick and the waveguide was 2.425 mm thick.

8. The multi-layer radome according to claim 1, wherein: The overmolded applique includes at least one of an illuminated portion, a black portion, and a chrome portion.

9. The multi-layer radome according to claim 1, further comprising: An air gap between the overmolded decal and the waveguide.

10. The multi-layer radome according to claim 9, wherein: The air gap is 0.25 mm thick.

11. The multi-layer radome according to claim 1 , further comprising: A decorative border is configured to couple the overmolded applique, the lighting assembly, and the waveguide together.

12. A multi-layer radome, comprising: overmolded decals; Lighting components; a waveguide between the lighting assembly and the overmolded decal, wherein the waveguide is configured to transmit light from the lighting assembly to the overmolded decal; a gasket between the waveguide and the lighting assembly, the gasket being configured to seal a connection between the waveguide and the lighting assembly; a decorative border configured to securely couple the overmolded applique, the waveguide, and the lighting assembly together; a vent coupled to the lighting assembly, the vent configured to remove thermal energy from the multi-layer radome; and A mating connector is configured to secure the multi-layer radome to a radar source.

13. The multilayer radome according to claim 12, wherein the waveguide comprises: waveguide layer; as well as A light blocking backing coupled to the waveguide layer, wherein the light blocking backing is at most one-tenth as thin as the waveguide layer.

14. The multilayer radome according to claim 13, wherein: The waveguide layer was 2.25 mm thick and the light blocking backing was 0.125 mm thick.

15. The multilayer radome according to claim 14, wherein: The overmolded applique includes at least one of an illuminated portion, a black portion, and a chrome portion.

16. A multi-layer radome, comprising: overmolded decals; Lighting components; as well as a waveguide between the lighting assembly and the overmolded decal, the waveguide being directly exposed to the interior of the multilayer radome, wherein the overmolded decal directly overlaps the waveguide, and wherein the waveguide is configured to transmit light from the lighting assembly to the overmolded decal.

17. The multilayer radome according to claim 16, wherein the waveguide comprises: waveguide layer; as well as A light blocking backing coupled to the waveguide layer, wherein the light blocking backing is at most one-tenth as thin as the waveguide layer.

18. The multilayer radome according to claim 17, wherein: The waveguide layer was 2.25 mm thick and the light blocking backing was 0.125 mm thick.

19. The multilayer radome according to claim 16, wherein: The overmolded applique includes at least one of an illuminated portion, a black portion, and a chrome portion.

20. The multi-layer radome according to claim 16, further comprising: An air gap between the overmolded decal and the waveguide.

Images