An LED lighting device

Abstract

An illumination device has a printed circuit board with an aperture. A sealing mechanism is used to seal at least a portion of the sidewall of the aperture to prevent fluid ingress. A gasket of the sealing mechanism has a protruding portion that extends into the aperture and presses a gasket against a portion of the sidewall of the aperture to seal the portion. The protruding portion is engaged or fixed to the sidewall using an interference fit to provide a force for pressing against the gasket.

Description

Technical Field

[0001] This invention relates to the field of artificial lighting. Background Technology

[0002] The increasing use of artificial light is creating greater demand for artificial lighting equipment such as LED lighting devices. Typical lighting equipment will include a printed circuit board configured to support one or more light-emitting devices, such as light-emitting diodes (LEDs).

[0003] Printed circuit boards for lighting equipment typically include one or more apertures. These apertures are usually used to allow screws to pass through, for example, to secure LED lighting equipment to a surface or component, or to secure the printed circuit board to another component.

[0004] The presence of one or more apertures exposes the printed circuit board to the external environment, for example, allowing liquids to penetrate the surface of the printed circuit board through the apertures and / or between layers of a multilayer printed circuit board.

[0005] Current expectations are to improve the robustness of lighting equipment against liquid intrusion, for example, by reducing the risk that liquid will reach components carried by or on printed circuits.

[0006] US 8167468B1 discloses an LED lighting fixture comprising a metal core printed circuit board (MCPCB) having a rear side and a front side. At least one LED is mounted to the front side of the MCPCB. A transparent window is mounted and sealed to the front side of the MCPCB to surround the LED. A portion of the MCPCB extends from the transparent window such that it can have heat exchange contact with water when the window of the lighting fixture is submerged in water. Summary of the Invention

[0007] This invention is defined by the claims.

[0008] According to an example of one aspect of the invention, a lighting device is provided, which includes a printed circuit board and a sealing mechanism.

[0009] The printed circuit board is configured to support one or more light-emitting devices, wherein the printed circuit board includes an aperture extending from a first surface to a second surface, the aperture having an inner sidewall.

[0010] The sealing mechanism includes: a gasket positioned to contact the inner wall of an aperture of a printed circuit board; and a washer including a protrusion extending into the aperture. The protrusion is configured to engage with the inner wall of the aperture using an interference fit and to compress the gasket between the washer and the inner wall of the aperture.

[0011] This disclosure discloses a sealing mechanism for an aperture in a printed circuit board that seals a portion of the aperture's sidewall to prevent fluid intrusion. A gasket is positioned within the aperture to contact the portion of the sidewall to be sealed. A protruding portion of the gasket couples with the sidewall and applies pressure or force to the gasket, thereby pressing the gasket against the portion of the sidewall to be sealed (thus sealing said portion). In this way, the protruding portion serves to compress the gasket between itself and the sidewall, thereby sealing a portion of the sidewall to prevent fluid intrusion (i.e., allowing little or no fluid to flow between the gasket and the sidewall).

[0012] The lighting device may also include a screw comprising: a head portion configured to engage with a washer; and a threaded portion configured to pass through a bore in the washer and the printed circuit board for securing the lighting device to an outer surface or component. By configuring the screw to engage with the washer (when secured to the outer surface or component), the likelihood of washer displacement and consequently, unsealing of a portion of the gasket's sidewall is reduced. This method also increases the pressure applied to the gasket by the washer to improve the sealing performance of the sealing mechanism.

[0013] In a preferred example, the surface of the protruding portion has a shape that matches the inner wall of the aperture. This method facilitates a tight compression or fit between the gasket and the inner wall of the aperture.

[0014] In a preferred embodiment, the printed circuit board includes multiple layers, including at least one humidity-sensitive layer; and the gasket has a thickness sufficient to cover at least the at least one humidity-sensitive layer from the inner sidewall of the aperture. This method reduces the risk of fluid intrusion between the layers of a multilayer printed circuit board (e.g., MCPCB).

[0015] In some examples, the printed circuit board comprises multiple layers, and the gasket is positioned to contact at least one boundary or interface between two or more of the multiple layers at the inner sidewall of the aperture. This approach allows the gasket to seal the boundary edges between previously exposed (towards the aperture) layers to prevent fluid intrusion, thereby reducing the risk of interlayer damage or moisture.

[0016] The gasket may include a gasket limiting portion that extends from the protrusion and is present on at least a portion of the gasket to limit movement of the gasket in a direction away from the orifice (e.g., in a direction toward the plane containing the first surface). This reduces the risk or possibility of gasket displacement or repositioning, thereby affecting the seal formed between the gasket and the sidewalls of the orifice.

[0017] The gasket may include a PCB cover portion configured to extend from the gasket limiting portion and cover a portion of a first surface of the printed circuit board. This PCB cover portion may contact the first surface, for example, to restrict movement of the gasket in a direction away from the plane containing the first surface. This similarly reduces the risk that the seal formed between the gasket and a portion of the sidewall will be compromised.

[0018] In some embodiments, the lighting device may further include a second gasket positioned between the PCB cover portion and the first surface of the printed circuit board. The second gasket can be used to reduce the risk of water intrusion from the first surface of the printed circuit board toward the sealed portion of the sidewall.

[0019] In some examples, the second gasket is positioned between the first PCB cover sub-part of the PCB cover portion and the first surface of the printed circuit board; and the PCB cover portion also includes a second PCB cover sub-part configured to contact the first surface of the printed circuit board, the second PCB cover sub-part being located between the first PCB cover portion and the gasket limiting portion.

[0020] This method provides a further seal between the PCB cover portion and the first surface of the printed circuit board, thereby reducing fluid intrusion from the first surface of the printed circuit board to the gasket. This improves the sealing performance of the sealing mechanism.

[0021] The lighting device can be configured such that the second PCB cover sub-part is configured to surround the aperture at the main surface of the printed circuit board; and the first PCB cover sub-part is configured to surround the second PCB cover sub-part.

[0022] In some examples, the second gasket includes an adhesive configured to adhesively couple the gasket to the first surface. This approach advantageously increases the pressure applied to the gasket by the gasket, thereby improving the sealing performance of the sealing mechanism on the sidewall (the sealing portion).

[0023] The gasket may comprise a flexible material (e.g., an elastomer) that is in continuous contact with the inner sidewall of the aperture. For example, the gasket may be an O-ring.

[0024] A gasket, the inner sidewall of a hole in a printed circuit board, and the first surface of the printed circuit board can be configured to surround the gasket therebetween. In other words, the gasket can be completely encapsulated by a sealing mechanism and the printed circuit. The package can define a package volume that includes the gasket and a portion of the sidewall (e.g., a sealing portion of the sidewall). This protects the package volume from water or liquid intrusion.

[0025] The lighting device may also include a cover layer configured to cover at least a portion of a printed circuit board. The cover layer preferably includes one or more lenses for one or more light-emitting devices, for example, a lens for each light-emitting device.

[0026] The lighting device may also include a third gasket configured to adhesively couple the gasket to the cover layer. This increases the fluid intrusion protection of the sealing mechanism.

[0027] The lighting device may also include a fourth gasket configured to adhesively couple the cover layer to the printed circuit board. This causes the cover layer to press against the gasket, thereby increasing the pressure applied by the gasket to the gasket and thus improving the sealing performance of the sealing mechanism.

[0028] The lighting device may also include a fifth gasket comprising an integrally formed portion of an adhesive configured to adhesively couple the cover layer to both the printed circuit board and the gasket. This approach reduces the likelihood of fluid intrusion from an area not between the gasket and the first surface of the printed circuit board into the area between the gasket and the first surface of the printed circuit board, thereby improving the fluid intrusion protection of the sealing mechanism. The method also causes the cover layer to press against the gasket, thereby increasing the pressure applied by the gasket to the gasket and thus improving the sealing performance of the sealing mechanism.

[0029] If present, the third, fourth, and fifth gaskets can be formed from a uniform, adhesive, integrally formed portion.

[0030] In some examples, the lighting device includes multiple apertures and corresponding multiple sealing mechanisms. Each sealing mechanism can be positioned and / or configured to be located within and / or around a corresponding aperture. Each sealing mechanism can be implemented as described above.

[0031] A luminaire is also proposed, which includes any lighting device described herein and lighting facilities that include one or more luminaires and / or one or more lighting devices.

[0032] These and other aspects of the invention will become apparent from the following description of several embodiments. Attached Figure Description

[0033] To better understand the invention and to more clearly illustrate how to implement it, reference will now be made to the accompanying drawings by way of example only, in which:

[0034] Figure 1 The proposed lighting device is shown;

[0035] Figure 2 A cross-section of a portion of the proposed lighting device is shown;

[0036] Figure 3 Another cross-section of a portion of the proposed lighting device is shown;

[0037] Figure 4 An exploded view of a portion of the proposed lighting device is provided;

[0038] Figure 5 A side view of the sealing mechanism for the proposed lighting device is provided;

[0039] Figure 6 A cross-sectional view of the sealing mechanism for the proposed lighting device is provided;

[0040] Figure 7 An exploded view of the sealing mechanism for the proposed lighting device is provided;

[0041] Figure 8 A first view of the gasket used in this sealing mechanism is provided; and

[0042] Figure 9 A second view of the gasket used in the sealing mechanism is provided. Detailed Implementation

[0043] The invention will be described with reference to the accompanying drawings.

[0044] It should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the apparatuses, systems, and methods, are for illustrative purposes only and are not intended to limit the scope of the invention. These and other features, aspects, and advantages of the apparatuses, systems, and methods of the present invention will become more readily apparent from the following description, the appended claims, and the accompanying drawings. It should be understood that the drawings are merely schematic and not drawn to scale. It should also be understood that the same reference numerals are used throughout the drawings to denote the same or similar parts.

[0045] This invention provides a lighting device having a printed circuit board with an aperture. A sealing mechanism is used to seal at least a portion of the sidewall of the aperture to prevent fluid intrusion. The gasket of the sealing mechanism has a protruding portion that extends into the aperture and presses the gasket against a portion of the sidewall of the aperture, thereby sealing said portion. The protruding portion is engaged or secured to the sidewall using an interference fit to provide a force for compressing the gasket.

[0046] Figure 1 A lighting device 100 in which the proposed embodiment can be employed is shown for improved context understanding. The lighting device 100 includes a printed circuit board 110 and a cover layer 120 covering a first surface of the printed circuit board 110.

[0047] Examples of printed circuit boards (PCBs) are well known in the art, and include multilayer printed circuit boards (i.e., PCBs comprising multiple layers). One example of a multilayer PCB is an MCPCB (metal core PCB), which comprises a stack of layers including: a first insulating layer, a (copper) track layer; a second insulating layer and an aluminum core or aluminum layer. Other examples of multilayer PCBs are known in the art.

[0048] Printed circuit board 110 can support one or more light-emitting elements ( Figure 1 (Not visible in the circuit), such as LEDs or LED devices. Therefore, lighting equipment may include one or more LEDs or LED devices supported by a printed circuit board.

[0049] The cover layer 120 may include a lens 125 for each light-emitting element to, for example, control the direction of the light beam output by the corresponding light-emitting element.

[0050] To facilitate coupling of the printed circuit board 110 to another component or surface, such as a heat sink for heat dissipation, the printed circuit board 110 includes one or more apertures 115 that extend from a first surface through the printed circuit board to an opposing second surface. Therefore, an alternative label for the aperture is a through-hole. Screws or other fastening devices (e.g., clips) can extend through the aperture and engage with the lighting device 100 to secure the lighting device, and thus the printed circuit board 110, to another component or surface, such as the surface of a heat sink or lamp.

[0051] The cover layer 120 may include apertures with similar positioning and configuration.

[0052] The covering layer can be formed from any suitable material, such as light-transmitting materials like plastic or glass.

[0053] The presence of multiple apertures increases the risk of fluid intrusion into components of a printed circuit board, particularly between any layers of the board. This disclosure proposes a method to mitigate this risk. More specifically, the invention provides a sealing mechanism for each aperture of a printed circuit board, which can be used to improve fluid intrusion protection.

[0054] A printed circuit board may include one or more apertures, for example, multiple apertures. The sealing mechanism described below can be configured for each aperture.

[0055] Figure 2 This is a cross-sectional view showing a portion of the lighting device 100 with the proposed sealing mechanism 200. Figure 3 An enlarged view of a portion of the proposed sealing mechanism 200 is provided.

[0056] As previously described, the lighting device 100 includes a printed circuit board 110 having a first surface 111 and a second surface 112. An aperture 115 of the printed circuit board extends from the first surface 111 to the second surface 112, i.e., through the printed circuit board. The aperture 115 has or defines an inner sidewall 116. In the illustrated example, the aperture 115 has a circular cross-sectional shape. However, the aperture may have different cross-sectional shapes.

[0057] It should be understood that the printed circuit board 110 may be a multilayer printed circuit board, i.e., it may include multiple layers. In this case, the aperture 115 will expose the boundaries between the multiple layers at the aperture, more specifically at the inner sidewall 116 of the aperture. The proposed method provides a mechanism for sealing at the inner sidewall 116 of the aperture, for example, to prevent fluid intrusion between any layers of the printed circuit board.

[0058] The sealing mechanism 200 includes a gasket 210 and a washer 220.

[0059] Gasket 210 is positioned to contact the inner wall 116 of aperture 115. Specifically, gasket 210 may completely surround or continuously contact the inner wall 116 of aperture 115. In the illustrated example, gasket 210 is made of a flexible material (e.g., an elastomer) that continuously contacts the inner wall 116 of aperture 115. Specifically, gasket 210 may be formed of a flexible but non-adhesive material, such as rubber, elastic material, thermoelastic material, thermosetting material, or thermoplastic material. For example, gasket 210 may be formed of (e.g., high-temperature resistant) fluororubber (an example of a thermosetting elastomer). For example, gasket 210 may be a ring, such as an O-ring, although the gasket may take other shapes for non-cylindrical apertures 115.

[0060] Washer 220 includes a protrusion 225 extending into bore 115. The protrusion 225 is configured to engage with the inner wall 116 of the bore using an interference fit (also known as a press fit or friction fit). This can occur at an interference fit location 225A. The protrusion is also configured to contact gasket 210 via an interference fit and to press gasket 210 between washer 220 and the inner wall 116. Thus, due to the interference fit, the protrusion 225 applies pressure to gasket 210 in a direction toward the inner wall, thereby pressing gasket 210 against the inner wall.

[0061] This method provides a mechanism for sealing at least a portion of the inner wall to prevent fluid intrusion through the aperture. This significantly reduces the risk of fluid intrusion damaging the printed circuit board or components carried by the PCB.

[0062] In other words, the protrusion 225 and the gasket 210 are configured to press the gasket 210 against a portion of the inner wall 116 of the aperture 115. This prevents or reduces fluid flow or intrusion toward said portion of the inner wall 116. This portion of the inner wall 116 may be referred to as the sealing portion of the inner wall because it prevents fluid intrusion by being sealed by the gasket 210 when pressed against the inner wall.

[0063] In particular, a portion of the protruding part's surface can have a shape that matches or complements the inner wall of the bore. This approach facilitates a tight compression or fit between the gasket and the inner wall of the bore.

[0064] If the PCB is a multilayer PCB, the gasket 210 is preferably positioned to contact or press against at least one boundary between the layers of the PCB at the inner sidewall 116 of the aperture. Specifically, the gasket 210 may cover at least one (otherwise exposed) portion of the PCB at the inner sidewall of the aperture. This reduces the risk of fluid intrusion between the layers of the PCB. Therefore, the sealing portion of the inner sidewall 116 may include one or more locations on the inner sidewall where the interface or boundary between two layers of the PCB would otherwise be exposed to the aperture.

[0065] In a specific example, if the PCB is a metal core PCB, the spacer 210 is preferably pressed against the metal core layer of the metal core PCB, for example, the portion of the metal core layer of the metal core PCB exposed at the inner sidewall. More specifically, the spacer 210 may be positioned to cover any interface between the metal core layer and any other layer of the PCB (at the inner sidewall of the aperture).

[0066] The protrusion 225A may have a shape complementary to (e.g., identical to) the shape of the aperture 115. Preferably, at least one dimension (e.g., width or length) of the protrusion in a plane parallel to the first surface 111 of the printed circuit board is slightly larger than the value of the aperture(s) of the same dimension(s) in the same plane. This ensures an interference fit.

[0067] For example, in a plane parallel to the first surface 111, the aperture 115 may have a circular cross-sectional shape, and the protrusion 225A may have an annular cross-sectional shape. The diameter of the annular cross-sectional shape of the protrusion 225A may be slightly larger than the diameter of the circular cross-sectional shape of the aperture 115.

[0068] The gasket 220 may also include a gasket limiting portion 226. The gasket limiting portion 226 extends from the protrusion 225 and is present on at least a portion of the gasket to limit movement of the gasket in a direction away from the bore. Specifically, the gasket limiting portion 226 is configured to limit or prevent movement of the gasket in a direction away from the interference fit position 225A.

[0069] The gasket limiting portion 226 can contact the first surface 111 of the printed circuit board 110. In this way, the gasket 220 can completely surround the gasket 210 between itself and the printed circuit board 110. Specifically, the gasket limiting portion 226, the protrusion 225, the inner sidewall 116, and (optionally) the first surface 111 of the printed circuit board can together surround and / or encapsulate the gasket 210.

[0070] The gasket 220 may also include PCB cover portions 221, 222, which are configured to extend from the gasket limiting portion 226 and cover a portion of the first surface 111 of the printed circuit board 110. In particular, the PCB cover portions may extend away from the aperture on the first surface 111 of the printed circuit board, for example, in a direction generally perpendicular to the protrusion 225.

[0071] PCB cover portions 221, 222 may include a first PCB cover sub-portion 221 (i.e., a first sub-portion). The first sub-portion is coupled to a first surface 111 of the printed circuit board 110 via a second spacer 230.

[0072] The second gasket 230 may include a sealing material such as silicone or epoxy. In such an embodiment, the interference fit of the protruding portion may also be configured such that the first PCB cover sub-portion 221 presses the second gasket 230 against the first surface 111 of the printed circuit board 110. This reduces the risk of any fluid intrusion at the first surface toward the gasket 210 (e.g., and thus toward the sealing portion of the sidewall 116 of the aperture 115).

[0073] In another example, the second gasket includes an adhesive that adhesively couples the gasket 200 to the first surface 111. The adhesive serves both to improve the bond between the gasket and the printed circuit board, for example, by providing stronger coupling to reduce the risk of movement that could lead to fluid intrusion, and to act as a barrier to prevent fluid from entering from the first surface 111.

[0074] Specifically, the interference fit of the protruding portion and the adhesive force provided by the second gasket formed by the adhesive combine to increase the pressure of the gasket 210 against the sidewall 116 of the aperture 115. This helps prevent fluid leakage or flow along the sidewall or through the gasket, for example, reducing fluid flow between the aperture and / or the layers of the printed circuit board (when the gasket 210 is positioned against any such boundary).

[0075] The first sub-section 221 is thus effectively raised relative to the first surface 111 of the printed circuit board 110. This leaves space for positioning gaskets, such as adhesive, therebetween.

[0076] The PCB cover portions 221 and 222 may further include a second PCB cover sub-portion 222 (i.e., a second sub-portion). The second sub-portion 222 directly contacts the first surface 111 of the printed circuit board. The second sub-portion is located between the aperture 115 and the first sub-portion 221. The use of the second sub-portion 222 also improves the mechanical strength of the gasket because the concave / convex shape of the sub-portions 221 and 222 makes the cover portion more rigid than a sub-portion with a flat shape.

[0077] The second sub-part 222 may surround the aperture at / on the main surface 111 of the printed circuit board 110. The first sub-part 221 may surround the second sub-part 222.

[0078] Figure 2 The diagram also illustrates how aperture 115 is configured to allow a fixing device 290 (e.g., a screw) to pass through it. This fixing device is configured to engage with the printed circuit board and / or washer to secure the printed lighting device to an external component or surface.

[0079] In a specific example, the retaining device 290 engages with the gasket 220 to secure the printed lighting device to an external component or surface. This reduces the likelihood that the gasket will shift position, such as falling out of the aperture 115, and thereby increases the sealing success rate of the sealing mechanism.

[0080] The fixing device 290 may include, for example, a screw. The screw may include a head portion 291 configured to engage with a washer (and / or printed circuit board). The screw may also include a screw-fit portion configured to pass through a hole in the washer and the printed circuit board for securing the lighting device to an external surface or component. The use of a screw is particularly advantageous because the screw (when secured to an external component or surface) presses directly against the washer to enhance the sealing effect of the sealing mechanism.

[0081] Washer 220 can be formed from any suitable material for preventing intrusion, such as stainless steel or plastic. In particular, washer 220 can be made of a spring-like (elastic) material, so that the washer can be manipulated to insert into the bore and apply pressure to gasket 210.

[0082] Further fluid intrusion protection can be achieved by using the cover layer 120.

[0083] As previously described, the overlay is configured to cover a portion of the first surface of the printed circuit board 110.

[0084] Specifically, the lighting device may also include a third gasket 252 positioned between the gasket 220 and the cover layer 120. The third gasket prevents or reduces fluid intrusion from the aperture into the first surface 111 of the printed circuit board 110 (and vice versa). Preferably, the third gasket does not directly contact the printed circuit board 110.

[0085] The third gasket may include an adhesive, such as a sealant / paste, for adhesively coupling the gasket to the cover layer. This method also helps to increase the force applied to the gasket 210 by the gasket, further improving the seal of the sealing mechanism.

[0086] The lighting device may also include a fourth gasket 253 positioned between the cover layer 120 and the printed circuit board 110 (first surface 111). The fourth gasket may be positioned close to or adjacent to the gasket, for example, around the gasket. Similarly, the fourth gasket can prevent or reduce fluid intrusion from the aperture into the first surface 111 of the printed circuit board 110 (or vice versa). Preferably, the fourth gasket does not directly contact the gasket.

[0087] In some examples, the fourth gasket includes an adhesive, such as a sealant / paste, for adhesively coupling the cover layer to the printed circuit board 110 (first surface 111). This advantageously increases the force applied to the gasket by the gasket (via other portions of the cover layer 120).

[0088] The lighting device 100 may include a fifth gasket 254 comprising an integrally formed portion of an adhesive, such as a sealant / paste, configured to adhesively couple the cover layer 120 to both the printed circuit board 110 and the gasket 220. Thus, a single-piece adhesive covers the boundary between the edge of the gasket 220 and the printed circuit board 110. This reduces or prevents fluid from flowing from the printed circuit board beneath the gasket (e.g., toward the gasket).

[0089] In typical embodiments, the third, fourth, and / or fifth gaskets may be formed of adhesives, such as (hot) melt adhesives or sealants / pastes, for example, silicone or epoxy resins. However, in alternative embodiments of the above embodiments, the third, fourth, and / or fifth gaskets (if present) may comprise flexible materials, such as elastomers or thermoplastics.

[0090] The third, fourth, and / or fifth gaskets can be held in place by securing the cover layer 120 to the gasket 220 and / or the printed circuit board 110, for example by means of the fastening device 290. Alternatively and / or additionally, the third, fourth, and / or fifth gaskets themselves can hold the cover layer 120 to the gasket and / or the printed circuit board, for example by using adhesive force (i.e., by forming with an adhesive).

[0091] In practice, if all the third, fourth, and fifth gaskets are present, they can be formed from a single, uniform sheet of material. Specifically, they can be formed from a single adhesive layer. The cover layer 120 may include grooves for each of the third, fourth, and fifth gaskets, these grooves being filled with adhesive, after which the cover layer is pressed against the gasket 220 and the printed circuit board 110 to adhere the cover layer thereto. In this way, the third, fourth, and fifth gaskets can effectively form a single gasket coupling the cover layer 120 to the gasket 220 and the printed circuit board.

[0092] Figure 2 The relative position of the light-emitting element 299 with respect to the lens 125 of the cover layer 120 is also shown.

[0093] Figure 4 An exploded view of a portion of the lighting device 100 is provided to more clearly illustrate the various features previously described.

[0094] Figure 4 This also helps in understanding how the third, fourth, and fifth gaskets are formed in the embodiments. Specifically, a series of recesses 410 can be defined in the cover layer 120. Each recess can define the shape and / or position of a corresponding one of the third, fourth, and fifth gaskets. The recesses 410 can then be filled with a sealant or paste (such as silicone). The cover layer 120 can then be pressed or pushed against the printed circuit board 110 and the gasket 220. The sealant / paste then cures to form gaskets 252, 253, and 254.

[0095] Figure 5 A side view of the proposed sealing mechanism is shown. Figure 6 A cross-sectional view of the proposed sealing mechanism is provided. Figure 7 Exploded views of the proposed sealing mechanism are provided. These views show the structure of the proposed sealing mechanism more clearly, especially the structure of the protruding portion 225.

[0096] like Figure 7 As shown, the gasket 210 may have a thickness t. Preferably, the thickness t of the gasket is sufficient to cover at least one or more humidity-sensitive layers (if present) of the printed circuit board from the inner wall of the aperture. In particular, the size and position of the gasket may be configured to cover the interface or boundary of each humidity-sensitive layer at the inner wall of the aperture, thereby preventing or reducing fluid intrusion between the layers of the printed circuit board.

[0097] Figure 8 A top view of washer 220 is provided, while Figure 9 A lower view of washer 220 is provided. These figures show the structure of the sub-parts of washer 220 more clearly.

[0098] Although not shown or described in detail, it is clear that printed circuit boards can carry connection circuits (e.g., conductors) and / or carry one or more other electrical components. This construction is well known in the art.

[0099] A luminaire comprising one or more lighting devices as disclosed herein is also proposed. The luminaire may include additional components, such as drive circuitry, one or more mounting components, one or more housings, sensing circuitry, monitoring circuitry, control circuitry, etc.

[0100] By studying the accompanying drawings, the disclosure, and the appended claims, those skilled in the art can understand and implement variations of the disclosed embodiments in practicing the claimed invention. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality.

[0101] The fact that certain measures are described in mutually different dependent claims does not imply that combinations of these measures cannot be used advantageously.

[0102] If the term “suitable” is used in the claims or description, it should be noted that the term “suitable” is intended to be equivalent to the term “configured as.” If the term “arrangement” is used in the claims or description, it should be noted that the term “arrangement” is intended to be equivalent to the term “system,” and vice versa.

[0103] Any reference numerals in the claims should not be construed as limiting the scope.

Claims

1. A lighting device (100), comprising: A printed circuit board (110) is configured to support one or more light-emitting devices (299), wherein the printed circuit board includes an aperture (115) extending from a first surface (111) to a second surface (112), the aperture having an inner sidewall (116). as well as Sealing mechanism (200), the sealing mechanism comprising: A gasket (210) positioned to contact the inner sidewall (116) of the aperture (115) of the printed circuit board (110); and Washer (220), the washer including a protrusion (225) extending into the aperture (115), wherein the protrusion is configured to engage with the inner wall (116) of the aperture using an interference fit and press the washer (210) between the washer and the inner wall (116) of the aperture (115). The lighting device (100) further includes a screw (290), the screw comprising: The head portion (291) is configured to engage with the washer; and The screw mating part (292) is configured to pass through the aperture of the washer and the printed circuit board for securing the lighting device (100) to an outer surface or component.

2. The lighting device (100) according to claim 1, wherein: The printed circuit board includes multiple layers, and the multiple layers include at least one humidity-sensitive layer; and The gasket (210) has a thickness (t) sufficient to cover at least the at least one humidity-sensitive layer from the inner sidewall (116) of the aperture (115).

3. The lighting device (100) according to claim 2, wherein the washer (220) includes a washer limiting portion (226) extending from the protrusion and over at least a portion of the washer to limit movement of the washer in a direction away from the aperture.

4. The lighting device of claim 3, wherein the gasket includes a PCB cover portion (221, 222) configured to extend from the gasket limiting portion and cover a portion of the first surface (111) of the printed circuit board.

5. The lighting device according to claim 4, characterized in that: The lighting device also includes a second gasket positioned between the PCB cover portion (221, 222) and the first surface (111) of the printed circuit board.

6. The lighting device according to claim 5, wherein: The second gasket is positioned between the first PCB cover sub-part (221) of the PCB cover portion and the first surface (111) of the printed circuit board (110); and The PCB cover portion further includes a second PCB cover sub-portion (222) configured to contact the first surface (111) of the printed circuit board, and the second PCB cover sub-portion is located between the first PCB cover sub-portion and the gasket limiting portion (226).

7. The lighting device according to claim 6, wherein: The second PCB cover sub-portion is configured to surround the aperture at the main surface of the printed circuit board; and The first PCB cover sub-part is configured to surround the second PCB cover sub-part.

8. The lighting device (100) according to any one of claims 5 to 7, wherein the second gasket comprises an adhesive configured to adhesively couple the gasket (200) to the first surface (111).

9. The lighting device (100) according to any one of claims 1 to 7, wherein the gasket (210) is an O-ring.

10. The lighting device (100) according to any one of claims 1 to 7, wherein the gasket (220), the inner sidewall (116) of the aperture (115) of the printed circuit board (110) and the first surface (111) of the printed circuit board (100) are configured to surround the gasket therebetween.

11. The lighting device (100) according to any one of claims 1 to 7, characterized in that: It also includes a cover layer (120) configured to cover at least a portion of the printed circuit board.

12. The lighting device (100) according to claim 11, characterized in that: It also includes a third gasket (252) configured to adhesively couple the gasket to the cover layer.

13. The lighting device (100) according to claim 11, characterized in that: It also includes a fourth pad (253) configured to adhesively couple the cover layer to the printed circuit board.

14. The lighting device (100) according to claim 11, characterized in that: It also includes a fifth gasket (254) comprising an integrally formed portion of an adhesive configured to adhesively couple the cover layer to both the printed circuit board and the gasket.

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