Ring-shaped lighting device

Abstract

This ring-type lighting device (1) comprises an annular case member (10) that has an inner wall part (20) that defines a central hollow part and an outer wall part (30) that defines an annular opening part (12) that surrounds the hollow part (11), at least one LED member (40) that is provided to face an opening (12a) of the opening part (12), and an annular cover member (50) that is provided between the opening (12a) and the LED member (40) and blocks the opening part (12). Mounting parts (23, 33) on which circumferential edge parts (54a, 54b) of the cover member (50) are mounted and held are formed on the case member (10), annular elastic members (51, 52) are provided between the mounting parts (23, 33) and the cover member (50), and pressing members (60, 70) press the circumferential edge parts (54a, 54b) of the cover member (50) from the opening part (12) side. The pressing members (60, 70) engage and are thereby fixed to the case member (10). Such a lighting device is easily assembled and can also be downsized while remaining waterproof.

Description

[Technical Field]

[0001] The present invention relates to a ring-shaped illumination device. [Background technology]

[0002] Lighting devices are used in a variety of situations, and may be required to be waterproof and dustproof depending on the application. For example, the lighting device described in Patent Document 1 is a waterproof device used outdoors as a downlight, spotlight, etc. The lighting device described in Patent Document 1 is provided with a sealing member to prevent water from entering the circuit board side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-121497 Summary of the Invention [Problem to be solved by the invention]

[0004] Even if not for outdoor use, lighting devices used in automated factory automation (FA) processes on factory production lines require high levels of waterproofing and dustproofing, and at the same time, miniaturization is required due to the often limited installation space. However, if a glass plate used as a cover member for the light source is screwed in place, the external dimensions of the lighting device would increase due to the required screwing space. Furthermore, the screws must be spaced apart from the LED's light-emitting axis in the circumferential direction so as not to interfere with the path of light from the LED, necessitating a large screwing space, making miniaturization difficult. Another problem is that fastening the cover member with screws increases the assembly time.

[0005] The present invention has been made in view of the above circumstances, and has an object to provide a ring-shaped illumination device that is easy to assemble, waterproof, and compact. [Means for solving the problem]

[0006] In order to achieve the above object, firstly, the present invention provides a ring-shaped lighting device comprising: an annular case member having an inner wall portion defining a hollow portion in the center and an outer wall portion defining a ring-shaped opening surrounding the hollow portion; one or more LED members provided facing the opening of the opening; and an annular cover member provided between the opening and the LED members and closing the opening, the ring-shaped lighting device further comprising: a mounting portion formed on the case member on which a peripheral portion of the cover member is placed and held; an annular elastic member provided between the mounting portion and the cover member; and a pressing member that presses the peripheral portion of the cover member from the opening side, the pressing member engaging with and fixing the case member (Invention 1).

[0007] According to the above invention (Invention 1), by engaging the pressing member with the case member, the pressing member presses the peripheral portion of the cover member, thereby fixing the cover member and pressing the elastic member to elastically deform it, thereby realizing a structure with improved waterproofing, and therefore it is possible to provide a ring-shaped lighting device that is easy to assemble, has waterproofing, and is miniaturized.

[0008] In the above invention (Invention 1), another annular elastic member may be further provided between the pressing member and the cover member (Invention 2).

[0009] In the above invention (Invention 2), a plate-like member for reducing friction may be provided between the pressing member and the separate annular elastic member (Invention 3).

[0010] In the above inventions (Inventions 1-3), the pressing member may be annular and may be fixed to the case member by being screwed thereto (Invention 4).

[0011] In the above inventions (Inventions 1-4), it is preferable that the pressing member comprises an annular inner pressing member provided on the inner wall portion and pressing the peripheral edge portion of the cover member, and an annular outer pressing member provided on the outer wall portion and pressing the peripheral edge portion of the cover member, the inner pressing member being screwed and fixed to either the inner or outer peripheral wall surface of the inner wall portion, and the outer pressing member being screwed and fixed to either the inner or outer peripheral wall surface of the outer wall portion, the placing portion comprising an inner placing portion on which the inner peripheral edge portion of the cover member is placed, and an outer placing portion on which the outer peripheral edge portion of the cover member is placed, and the cover member is placed on the inner placing portion and the outer placing portion via the annular elastic member, respectively (Invention 5).

[0012] In the above inventions (Inventions 1-5), the elastic member may be a waterproof and dustproof rubber having a rectangular cross section (Invention 6). [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a ring-shaped illumination device that is easy to assemble, has waterproof properties, and is miniaturized. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view of a ring-shaped illumination device according to a first embodiment of the present invention. [Figure 2] 1 is an exploded perspective view of a ring-shaped lighting device according to a first embodiment of the present invention. [Figure 3] 1 is a cross-sectional view of a ring-shaped illumination device according to a first embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional view of a ring-shaped illumination device according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] First Embodiment A first embodiment of a ring-shaped illumination device of the present invention will be described with reference to Figures 1 to 3. Note that top, bottom, left, and right in each embodiment of the present invention correspond to top, bottom, left, and right shown in the drawings.

[0016] The ring-shaped lighting device 1 includes an annular case member 10. The case member 10 has a hollow portion 11 formed in the center of its axis. The case member 10 includes an inner wall portion 20 that defines the hollow portion 11, and an outer wall portion 30 that defines an annular opening 12 that surrounds the hollow portion 11 and is spaced apart from the inner wall portion 20 in the circumferential direction. The inner wall portion 20 and the outer wall portion 30 are formed by extending from an annular bottom wall portion 13.

[0017] In the case member 10, a board-receiving inner-wall step portion 22 is formed around the entire periphery of the inner peripheral surface 21 of the inner wall portion 20. Also, a board-receiving outer-wall step portion 32 is formed around the entire periphery of the inner peripheral surface 31 of the outer wall portion 30. In this embodiment, the inner peripheral surfaces 21, 31 refer to the mutually opposing surfaces of the inner wall portion 20 and the outer wall portion 30, and the board-receiving inner-wall step portion 22 and the board-receiving outer-wall step portion 32 are also annular step portions provided opposite each other. The board-receiving inner-wall step portion 22 and the board-receiving outer-wall step portion 32 are formed so that the upper surfaces of the respective steps are at the same height in the vertical direction (up and down direction).

[0018] An annular LED substrate 40 is placed on the substrate inner-wall step portion 22 and the substrate outer-wall step portion 32. The LED substrate 40 is held at its inner peripheral edge and outer peripheral edge by the substrate inner-wall step portion 22 and the substrate outer-wall step portion 32, respectively. In this embodiment, the substrate inner-wall step portion 22 and the substrate outer-wall step portion 32 are provided as annular step portions that are continuous in the circumferential direction. However, they may be provided discontinuously on the inner peripheral surfaces 21, 31 as long as they are capable of holding the LED substrate 40. Furthermore, the substrate inner-wall step portion 22 and the substrate outer-wall step portion 32 may be formed as a single step portion rather than as separate bodies. In this case, a through hole is provided in the single step portion to allow insertion of a power supply substrate, wiring, etc., as described below.

[0019] The LED substrate 40 has a plurality of LEDs 42 mounted on one side of an annular substrate member 41. The LED substrate 40 is arranged so that the light-emitting surfaces of the LEDs 42 face the opening 12a of the opening 12, i.e., so that the light-emitting surfaces face upward. The LED substrate 40 has the substrate member 41 fixed to at least one of the substrate inner-wall stepped portion 22 and the substrate outer-wall stepped portion 32 by, for example, screws. Any fixing method may be used as long as it does not hinder the miniaturization of the ring-shaped illumination device 1.

[0020] A power supply board (not shown) on which a power supply circuit for driving the LEDs 42 mounted on the LED board 40 is mounted is housed inside the case member 10. A power cable insertion hole (not shown) is formed in the bottom wall portion 13. A power cable is inserted through the power cable insertion hole to supply power to the power supply board and input a control signal to control the light emission of the LEDs 42. The power cable insertion hole may be located anywhere in the case member 10 as long as it can supply power to the LED board 40.

[0021] On the inner peripheral surface 21 of the inner wall portion 20, above the inner wall step portion 22 for substrate, a glass-receiving inner wall step portion 23 is formed along the entire periphery of the inner peripheral surface 21. On the inner peripheral surface 31 of the outer wall portion 30, above the outer wall step portion 32 for substrate, a glass-receiving outer wall step portion 33 is formed along the entire periphery of the inner peripheral surface 31. A wall portion 34 rising vertically in the figure extends from the inner peripheral edge of the glass-receiving outer wall step portion 33, and a groove portion 35 is defined by this wall portion 34, the glass-receiving outer wall step portion 33, and the outer wall portion 30. In this embodiment, the wall portion 34 extends continuously in the circumferential direction from the peripheral edge, but it may also be provided discontinuously in the circumferential direction.

[0022] The inner and outer glass wall step portions 23 and 33 are formed to be at the same height in the vertical direction, and are provided with an inner and outer rubber member 51 and 52, respectively, which have a rectangular cross section and are annular. That is, the inner rubber member 51 has a smaller inner diameter than the outer rubber member 52. A glass plate 50 is placed on the inner and outer glass wall step portions 23 and 33 via the inner and outer rubber members 51 and 52.

[0023] The glass plate 50 functions as a cover member for the case member 10, closes the opening 12, and is then sealed with an inner pressing member 60, an outer pressing member 70, an inner rubber member 51, an outer rubber member 52, etc., as described below, to provide waterproofing to the ring-shaped lighting device 1. The glass plate 50 is annular in top view. The glass plate 50 only needs to have optical transparency sufficient to allow light from the LEDs 42 to pass through, and may be a plastic plate (such as an acrylic resin plate, a milky white polycarbonate resin plate, or a prism plate) that has diffuse transmission and diffusion reflection properties. Various lenses or the like can also be used as the cover member to control the light distribution.

[0024] An upper inner rubber member 55 is provided on the upper part of the inner peripheral edge portion 54a of the glass plate 50. This upper inner rubber member 55 is an elastic member that is rectangular in cross section and has a height that is higher than the height of the case member 10 when placed on the glass plate 50, and is elastically deformed when pressed as described below.

[0025] A friction-reducing plate-like member 56 is provided between the upper inner rubber member 55 and an inner pressing member 60 (described later). The plate-like member 56 is an annular member made of resin such as PET (polyethylene terephthalate), POM (polyacetal), PC (polycarbonate), or fluororesin, and is provided to reduce friction generated between the upper inner rubber member 55 and the inner pressing member 60, and between the upper inner rubber member 55 and the glass plate 50.

[0026] Furthermore, the ring-shaped lighting device 1 has an inner pressing member 60 provided on the inner wall portion 20 and an outer pressing member 70 provided on the outer wall portion 30 of the case member 10. The inner pressing member 60 and the outer pressing member 70 press against the peripheral portion 54 of the glass plate 50, thereby fixing the glass plate 50 in place and pressing against the inner rubber member 51, the outer rubber member 52, and the upper inner rubber member 55 to elastically deform them, thereby improving waterproofing. Furthermore, since the inner pressing member 60 and the outer pressing member 70 are screwed and fixed to the case member 10, assembly is easy.

[0027] The inner pressing member 60 and the outer pressing member 70 will be described in detail below.

[0028] The inner pressing member 60 is provided at the upper end of the inner wall portion 20 of the case member 10, and includes a cylindrical inner base portion 61 and a flange portion 62 provided at the upper end of the inner base portion 61. The inner pressing member 60 is configured such that the flange portion 62 covers the upper end of the inner wall portion 20 in a top view.

[0029] A screw thread is formed on the outer peripheral surface 63 of the inner base 61, and a screw groove corresponding to the screw thread is formed on the outer peripheral surface 24 of the inner wall portion 20 (i.e., the surface on the hollow portion 11 side), so that the inner pressing member 60 is screwed (engaged) with the inner wall portion 20 and fixed. When fixed, the flange portion 62 presses the inner peripheral side peripheral edge portion 54a (peripheral edge end) of the glass plate 50 from above via the plate-shaped member 56 and the upper inner rubber member 55. As a result, the glass plate 50 is sandwiched and fixed between the upper inner rubber member 55 and the inner rubber member 51. Note that in this embodiment, a screw thread is formed on the outer peripheral surface 63 of the inner base 61, and a screw groove is formed on the outer peripheral surface 24 of the inner wall portion 20, but the formation of the screw thread and the screw groove may be reversed.

[0030] If the plate-like member 56 were not present, friction would occur between the inner pressing member 60 and the upper inner rubber member 55 when the inner pressing member 60 was screwed into the inner wall portion 20. As a result, a force would also act on the upper inner rubber member 55 in the rotational direction, causing friction between the upper inner rubber member 55 and the glass plate 50. By providing the plate-like member 56 between the upper inner rubber member 55 and the inner pressing member 60, friction does not occur between the inner pressing member 60 and the upper inner rubber member 55 when the inner pressing member 60 is screwed into the inner wall portion 20, thereby improving assembly ease.

[0031] The outer pressing member 70 includes a cylindrical outer base 71 and a pressing portion 72 formed continuously around the entire periphery of the inner peripheral edge portion of the lower end portion of the outer base 71. The pressing portion 72 is an annular wall portion formed by extending from the outer base 71 toward the glass plate 50.

[0032] A screw thread is formed on the outer peripheral surface 73 of the outer base portion 71, and a screw groove corresponding to the screw thread is formed on the inner peripheral surface 31 of the outer wall portion 30, so that the outer pressing member 70 is screwed into and fixed to the outer wall portion 30. Once fixed, the pressing portion 72 presses from above while in contact with the peripheral edge portion 54b of the glass plate 50. As a result, the glass plate 50 is sandwiched and fixed between the wall portion 34 and the pressing portion 72 facing the wall portion 34.

[0033] As described above, in this embodiment, the inner pressing member 60 and the outer pressing member 70 are screwed together and fixed to the case member 10, and the number of parts is small, making assembly easy. Furthermore, by fixing the glass plate 50 using the inner pressing member 60 and the outer pressing member 70 that are screwed together and fixed to the case member 10 in this manner, there is no need to fix the glass plate 50 with screws or the like, which allows for miniaturization. Furthermore, the inner pressing member 60 and the outer pressing member 70 press and fix the annular glass plate 50, and this pressure elastically deforms the inner rubber member 51, the upper inner rubber member 55, and the outer rubber member 52, thereby easily sealing the gap between the case member 10 and the glass plate 50. As described above, in this embodiment, the ring-shaped lighting device 1 is waterproof and dustproof, compact, and easy to assemble.

[0034] Furthermore, the outer rubber member 52 itself is pressed through the glass plate 50 and elastically deforms, so that the outer rubber member 52 not only seals but also functions to fix the position of the glass plate 50. Furthermore, by sandwiching the glass plate 50 between the inner rubber member 51 and the upper inner rubber member 55, high pressure (distortion) is not applied to the glass plate 50, preventing stress from being generated in the glass plate 50 and causing it to break. In this case, it is also possible to further provide another annular rubber member on the peripheral edge portion 54b on the outer periphery of the glass plate 50, but in the case of the ring-shaped lighting device 1 shown in this embodiment, it is possible to sufficiently fix the glass plate 50 while ensuring waterproofing, and it is also possible to reduce the number of parts compared to this case.

[0035] Alternatively, the pressing portion 72 may be omitted and the entire lower surface of the outer base 71 may be configured to press the entire outer peripheral edge portion 54b of the glass plate 50. In this case, the increased pressing area makes it possible to fix the glass plate 50 without generating unnecessary stress on the glass plate 50. On the other hand, by pressing only the position corresponding to the wall portion 34 with the pressing portion 72 as in this embodiment, the pressing area is reduced and the pressing force is increased, allowing for more stable fixation and improving sealing performance and waterproofing. In this case, even if the pressing force is increased, the presence of the wall portion 34 below the glass plate 50 makes it possible to support the glass plate 50 while a high pressing force is being applied.

[0036] Furthermore, the outer rubber member 52 is arranged to fit into the groove 35 so as not to fall off when the outer pressing member 70 is screwed and fixed to the outer wall portion 30. Furthermore, since the pressing portion 72 is formed on the outer base portion 71 so as to face the wall portion 34, the pressing portion 72 and the outer wall portion 30 are separated so that a space is formed between them, and even if liquid does infiltrate, the liquid can be stored in this space, resulting in high sealing performance. Furthermore, since the wall portion 34 is formed and the groove portion 35 is formed, even if liquid does infiltrate, the liquid can be stored in the groove portion 35, resulting in high sealing performance.

[0037] Second Embodiment Next, a second embodiment of the present invention will be described. Regarding the ring-shaped lighting device 1A according to the second embodiment of the present invention, a description of the same configuration as that of the first embodiment will be omitted. The outer pressing member 70 differs from the first embodiment in that it includes a flange portion 76 and an extension portion 77 that extends further from the flange portion 76 on the opposite side of the pressing portion 72 of the cylindrical outer base portion 71, i.e., on the upper end side. The flange portion 76 covers the upper end of the outer wall portion 30, and the extension portion 77 is configured to fit along the outer peripheral surface 37 of the outer wall portion 30.

[0038] In this embodiment, a screw thread is formed on the inner peripheral surface 78 of the extension portion 77, and a screw groove corresponding to the screw thread is formed on the outer peripheral surface 37 of the outer wall portion 30. The outer pressing member 70 is screwed into and fixed to the outer wall portion 30. In this embodiment as well, when the outer pressing member 70 is fixed to the outer wall portion 30, the pressing portion 72 presses from above while in contact with the peripheral portion 54b of the glass plate 50. As a result, the glass plate 50 is sandwiched and fixed between the wall portion 34 and the pressing portion 72 facing the wall portion 34. In this embodiment as well, the ring-shaped lighting device 1A has waterproof and dustproof effects, is compact, and is easy to assemble.

[0039] Although the ring-shaped illumination device according to the present invention has been described above with reference to the drawings, the present invention is not limited to the above-described embodiment and various modifications can be made.

[0040] For example, in each of the above-described embodiments, the inner pressing member 60 and the outer pressing member 70 are provided on the inner wall portion 20 and the outer wall portion 30, respectively, but this is not limited to this. A pressing member may be provided on only one of the inner wall portion 20 and the outer wall portion 30, and the other wall portion may be configured to be sealed with a sealant such as epoxy resin at the joint with the glass plate. In other words, it is sufficient that a pressing member is provided on at least one of the inner wall portion 20 and the outer wall portion 30. Even with this configuration, a lighting device can be easily assembled, can be miniaturized, and is highly waterproof.

[0041] Furthermore, in each of the above-described embodiments, the inner pressing member 60 is provided so as to be screwed into the inner wall portion 20, but the method of fixing the inner pressing member 60 to the inner wall portion 20 is not limited to this. For example, a hook-shaped engaging portion may be provided on the lower end side of the inner base portion 61 of the inner pressing member 60, and a recess-shaped engaged portion may be provided on the outer circumferential surface 24 of the inner wall portion 20 on the hollow portion 11 side, and these may be engaged to fix the inner pressing member 60 to the inner wall portion 20. Even with this fixing method, it is possible to improve waterproofness and reduce the size.

[0042] In the above-described embodiment, the inner pressing member 60 is fixed by screwing (engaging) the outer peripheral surface 63 of the inner base 61 with the outer peripheral surface 24 of the inner wall 20, but this is not limiting. For example, the inner pressing member 60 may have an extension portion formed by extending the flange 62 of the inner base 61 further downward, and the extension portion may be screwed and fixed to the inner peripheral surface 23 of the inner wall 20 facing the extension portion. In this case, the extension portion may be configured to directly press the glass plate 50, or may be configured to press the glass plate 50 via the upper inner rubber member 55.

[0043] Furthermore, in each of the above-described embodiments, the pressing portion 72 is formed around the entire inner circumference of the lower end of the outer base portion 71 and is a continuous ring when viewed from below, but this is not limited to this and the pressing portion 72 may also be discontinuous.

[0044] Additionally, in each of the above-described embodiments, the upper inner rubber member 55 is provided, but the upper inner rubber member 55 may not be provided. In this case, a pressing portion may also be formed on the inner pressing member 60, and the glass plate 50 may be directly pressed by the pressing portion.

[0045] In each of the above-described embodiments, rubber member 51 is used as the elastic member, but the present invention is not limited to this and may be an elastic member such as a closed-cell sponge that is impermeable to air and liquid, a metal gasket, etc. In the present embodiment, each rubber member 51 has a rectangular cross section, but the cross section may be circular, elliptical, or other shapes.

[0046] In each of the above-described embodiments, the plate-like member 51 for reducing friction is made of a resin annular member, but this is not limited to this, and the member may be made of a material that is less likely to cause friction with the inner pressing member 60, such as a metal such as SUS (stainless steel), aluminum, or brass. [Industrial Applicability]

[0047] The ring-shaped illumination device of the present invention is suitable for use as illumination for factory automation. [Explanation of symbols]

[0048] 1. 1A ring-shaped lighting device 10 Case material 11 Hollow part 12 Opening 13 Bottom wall 20 Inner wall 21 Inner surface 22 Inner wall step for substrate 23 Inner wall step for glass 24 Outer surface 30 Exterior wall 31 Inner surface 32 External wall step part for board 33 Exterior wall step for glass 34 Wall 35 Groove 37 Outer surface 40 LED boards 41 Substrate material 50 Glass Plate 51 Inner rubber member 52 outer rubber member 54a Periphery 54b Periphery 55 Upper inner rubber member 56 Plate-shaped member 60 Inner pressing member 61 Medial base 62 Flange 63 Outer surface 70 Outer pressing member 71 Lateral base 72 Pressing part 73 Outer surface 76 Flange 77 Extension section 78 Inner surface

Claims

1. an annular case member including an inner wall portion defining a central hollow portion and an outer wall portion defining an annular opening surrounding the hollow portion; one or more LED members provided facing the opening of the opening; an annular cover member provided between the opening and the LED member and closing the opening, a mounting portion formed on the case member on which a peripheral edge portion of the cover member is placed and held; an annular elastic member provided between the mounting portion and the cover member; a pressing member that presses the peripheral edge portion of the cover member from the opening side, The ring-shaped illumination device is characterized in that the pressing member is engaged with and fixed to the case member.

2. 2. The ring-shaped illumination device according to claim 1, wherein another annular elastic member is provided between the pressing member and the cover member.

3. 3. The ring-shaped illumination device according to claim 2, wherein a plate-shaped member for reducing friction is provided between the pressing member and the another annular elastic member.

4. 4. The ring-shaped illumination device according to claim 1, wherein the pressing member is annular and is fixed to the case member by being screwed thereto.

5. The pressing member is an annular inner pressing member provided on the inner wall portion and pressing the peripheral edge portion of the cover member; an annular outer pressing member provided on the outer wall portion and pressing the peripheral edge portion of the cover member; the inner pressing member is screwed to and fixed to either the inner circumferential surface or the outer circumferential surface of the inner wall portion, the outer pressing member is screwed to and fixed to either the inner circumferential surface or the outer circumferential surface of the outer wall portion, the mounting portion comprises an inner mounting portion on which an inner peripheral edge portion of the cover member is mounted, and an outer mounting portion on which an outer peripheral edge portion of the cover member is mounted, 5. The ring-shaped illumination device according to claim 1, wherein the cover member is placed on the inner placement portion and the outer placement portion via the annular elastic member.

6. 6. The ring-shaped illumination device according to claim 1, wherein the elastic member is a waterproof and dustproof rubber having a rectangular cross section.

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