Lighting device

Abstract

To provide a lighting fixture which is a ceiling-embedded type one and secures flame shielding performance of a ceiling when a fire occurs.SOLUTION: A ceiling-embedded lighting device 1 is installed in an opening hole 3 provided to a ceiling material 2 and includes: a cylindrical device body 10 made of material at least part of which has a melting point lower than that of steel; an installation spring 40 fixing the device body 10 to the opening hole 3; and a lid part 70 mounted to the upper part of the device body 10 and made of steel material. The lid part 70 includes: a base part 71 covering 80% or more of an opening area of the opening hole 3 in the top view of the lid part 70; and an extension part 72 connected to the base part 71 and extending along a direction apart from the outer peripheral part of the base part 71 in the top view of the lid part 70. The extension part 72 is disposed on the upper surface of the ceiling material 2 to support the base part 71 when disposing the lid part 70 on the upper surface of the ceiling material 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a lighting device, and more particularly to an embedded lighting device attached to an opening provided in a ceiling material.

Background Art

[0002] Conventionally, a ceiling-embedded lighting device including a light source, a device body to which the light source is attached, and a mounting spring for fixing the device body to an opening provided in a ceiling material has been widely known (see, for example, Patent Document 1). Such a lighting device is generally called a downlight.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a fire occurs, the temperature inside the building rises to 800°C or higher. In order to ensure the time for people to evacuate in such an environment, a quasi-fire-resistant structure aimed at maintaining the shape of the building for a predetermined time has been defined. Since the quasi-fire-resistant structure is a structure defined for the main structural parts from the viewpoints of evacuation and fire prevention from the building such as floors, walls, and roofs, the regulations for the ceiling structure of the building are ambiguous.

[0005] In this background, when the housing of the lighting device of Patent Document 1 is made of a material other than iron, such as aluminum or a resin material, the housing will be placed in a temperature environment far higher than its melting point during a fire and melt, resulting in holes in the ceiling. Therefore, fire may spread from the ceiling through these holes to the floor space of the upper floor, potentially failing to meet the criteria for the fire-resistant structure of the floor surface. Thus, the object of the present disclosure is to provide a lighting device such that, even when the housing of the lighting device melts in the event of a fire, the locations subject to the provisions of the fire-resistant structure can more easily meet the provisions of the fire-resistant structure. Furthermore, it is possible to suppress the collapse of the installed building or, even if the building collapses, to increase the time until collapse.

Means for Solving the Problems

[0006] A lighting device according to an aspect of the present disclosure is an embedded lighting device attached to an opening provided in a ceiling material, comprising a cylindrical device body at least partially made of a material with a melting point lower than that of iron, a mounting spring for fixing the device body to the opening, and a lid portion provided on the upper part of the device body and made of a steel material. The lid portion has a base portion that covers 80% or more of the opening area of the opening in a top view of the lid portion, and an extension portion connected to the base portion and extending along a direction away from the outer edge of the base portion in a top view of the lid portion. When the lid portion is disposed on the upper surface of the ceiling material, the extension portion is disposed on the upper surface of the ceiling material and supports the base portion.

Effects of the Invention

[0007] According to a lighting device which is an aspect of the present disclosure, in a ceiling-embedded lighting device, the flame-shielding performance of the ceiling during a fire can be ensured.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0009] Hereinafter, with reference to the drawings, an example of an embodiment of a lighting device according to the present disclosure will be described in detail. Note that a form formed by selectively combining each component of a plurality of embodiments and modification examples described below is included in the scope of the present disclosure.

[0010] [First Embodiment] With reference to FIGS. 1 to 5, the lighting device 1 according to the first embodiment will be described in detail. FIG. 1 is a perspective view of the lighting device 1 as seen from the upper side in a state where the lighting device 1 is attached to a ceiling material 2.

[0011] As shown in FIG. 1, the lighting device 1 is an embedded lighting device that irradiates light downward (floor, wall, etc.) by being attached to an opening 3 provided in a ceiling material 2 of a building. The lighting device 1 is generally called a downlight. In this specification, for convenience of explanation, in a state where the lighting device 1 is attached to the ceiling material 2, the vertically upper side of the lighting device 1 is referred to as "up" and the vertically lower side is referred to as "down".

[0012] The lighting device 1 is attached to, for example, a horizontal ceiling material 2 in a living room, but it can also be attached to a ceiling material 2 that is inclined with respect to the horizontal and vertical directions. Further, the lighting device 1 can also be attached to the ceiling material 2 in a corridor, entrance hall, etc. of a residence, or to the ceiling material 2 in public facilities such as libraries, commercial facilities such as department stores, offices, stores, factories, etc.

[0013] The lighting device 1 is preferably used for the ceiling material 2 of a building with a semi-fireproof structure. When used in a building with a semi-fireproof structure, it is preferable that the lighting device 1 does not impair the performance (semi-fireproof performance) for suppressing the spread of fire during a fire in the building structure. Although it will be described in detail later, at least a part of the device body 10 constituting the lighting device 1 is made of a material with a melting point lower than that of iron. On the other hand, the lid portion 70 provided above the device body 10 is made of a steel material with a high heat-resistant temperature. Thereby, even when the lighting device 1 is exposed to high temperatures and the device body 10 melts during a fire, the lid portion 70 does not melt. And according to the configuration of the lid portion 70 of the present embodiment, when the device body 10 melts, the lid portion 70 is supported on the upper surface of the ceiling material 2 in a state of covering most of the opening hole 3. As a result, it is possible to suppress the spread of flames through the opening hole 3.

[0014] Next, with further reference to FIGS. 2 to 5, the structure of the lighting device 1 will be described in detail. FIG. 2 is a perspective view of the lighting device 1 viewed from above, and FIG. 3 is an exploded perspective view of the lighting device 1.

[0015] As shown in FIGS. 2 and 3, the lighting device 1 includes a cylindrical device body 10, a light-emitting module 30 provided inside the device body 10, and a mounting spring 40 for fixing the device body 10 to the opening hole 3. Further, the lighting device 1 further includes a holder 50 for holding the light-emitting module 30, a light-transmitting cover 60 that engages with the holder 50 and covers the light-emitting module 30 and the holder 50, and a lid portion 70 provided on the upper part of the device body 10.

[0016] The apparatus main body 10 is a cylindrical body with an open lower end, and includes a cylindrical wall portion 11, a top plate portion 12 that closes the upper opening of the cylindrical wall portion 11, and protruding portions 13, 14, 15, 16 that extend upward from a part of the peripheral edge of the top plate portion 12. The apparatus main body 10 is a cylindrical member having a substantially circular cross-section perpendicular to the vertical direction, and has a flaring shape that expands in diameter toward the lower opening. Further, an annular flange portion 17 is provided at the peripheral edge of the opening of the apparatus main body 10. The flange portion 17 is provided to project radially outward at the peripheral edge of the opening of the apparatus main body 10.

[0017] Here, at least a part of the apparatus main body 10 is made of a material having a melting point lower than that of iron, for example, aluminum, an aluminum alloy, or a resin material. For example, the cylindrical wall portion 11 or the top plate portion 12 constituting the apparatus main body 10 is made of aluminum, an aluminum alloy, or a resin material. Since aluminum, an aluminum alloy, or a resin material has excellent workability, it can be manufactured even when the apparatus main body 10 has a complicated shape.

[0018] Examples of the resin material used for the apparatus main body 10 include polyesters such as polybutylene terephthalate (PBT). Further, when the apparatus main body 10 is made of aluminum or an aluminum alloy, the aluminum or the aluminum alloy is manufactured by press working, die drawing, or die casting, preferably by die casting.

[0019] The cylindrical wall portion 11 is formed along the vertical direction at the upper part of the apparatus main body 10, and has a shape that slopes so as to gradually expand radially outward from the central part in the vertical direction toward the lower end. Note that the cylindrical wall portion 11 may be curved. The inner surface of the cylindrical wall portion 11 facing the inside of the apparatus main body 10 serves as a reflecting surface for the light emitted from the light emitting module 30. Therefore, a metal layer may be provided on the inner surface of the cylindrical wall portion 11 by vapor deposition, plating, sputtering, etc. to increase the light reflectance, or it may be mirror-finished by polishing or the like. Further, a white coating film containing a white pigment may be provided on the inner surface of the cylindrical wall portion 11.

[0020] As described above, the top plate portion 12 is provided on the upper end side of the apparatus main body 10 and closes the upper opening of the cylindrical wall portion 11. The top plate portion 12 has, for example, a substantially disk shape and is formed substantially flat except for the regions where the protruding portions 13, 14, 15, 16 are provided. In the present embodiment, the holder 50 is screwed to the top plate portion 12. Therefore, the top plate portion 12 is provided with through holes 18 through which screw members (not shown) for fixing the holder 50 to the top plate portion 12 are inserted.

[0021] As described above, the protruding portions 13, 14, 15, 16 are provided on the upper surface of the top plate portion 12, and the heights of the upper ends of the protruding portions 13, 14, 15, 16 are substantially the same as the height of the upper end of the cylindrical wall portion 11. The protruding portions 13, 14, 15, 16 are provided at equal intervals in the circumferential direction, with an interval of 90° each. Through holes 19 into which screw members 75 for fixing the lid portion 70 to the apparatus main body 10 are inserted are provided on the upper surfaces of the protruding portions 13, 15. Further, protrusions 20 to be inserted into through holes 74 provided in a base portion 71 described later are provided on the upper surfaces of the protruding portions 14, 16. Note that through holes 19 may be provided on the upper surfaces of the protruding portions 14, 16 in the same manner as the upper surfaces of the protruding portions 13, 15.

[0022] A support portion 21 for fixing the mounting spring 40 is provided outside the apparatus main body 10. The support portion 21 is provided outside the apparatus main body 10 so as to straddle the flange portion 17 and the cylindrical wall portion 11. The support portion 21 is formed at two locations side by side in the radial direction of the apparatus main body 10 and has a shape into which the end portion of the mounting spring 40 can be inserted.

[0023] The light-emitting module 30 is held by the holder 50 and provided inside the apparatus main body 10. The light-emitting module 30 has, for example, a light source and a substrate on which the light source is disposed. The light-emitting element constituting the light source is preferably a semiconductor light-emitting element such as an LED (Light Emitting Diode). The light-emitting element may be encapsulated with a sealing layer containing a phosphor. In this case, part of the blue light of the light-emitting element is converted into light with a longer wavelength by the phosphor, and white light may be emitted by being mixed with the remaining part of the blue light. Further, the light-emitting module 30 may have a heat sink for diffusing the heat of the light source. The light-emitting module 30 is disposed in the apparatus main body 10, for example, in a state where the substrate or the heat sink is in contact with the top plate portion 12.

[0024] The mounting spring 40 is fixed to the support portion 21 provided outside the apparatus main body 10. The mounting spring 40 has a leaf spring structure and extends in the horizontal direction. The lighting device 1 is fixed to the ceiling material 2 by the mounting spring 40 abutting against the periphery of the opening hole 3 in the ceiling space. Note that three or more mounting springs 40 may be provided.

[0025] The holder 50 has a substantially annular bottom plate 51 with a window hole 53 formed at the center, and a peripheral wall 52 erected on the outer peripheral portion of the bottom plate 51 and formed in a cylindrical shape. The light-emitting module 30 is disposed in the holder 50 with the surface of the substrate on which the light source portion is mounted facing downward so that light is emitted through the window hole 53 of the bottom plate 51. On the outer surface of the peripheral wall 52, a protrusion 54 that functions as an engaging portion with the cover 60 is provided.

[0026] The cover 60 is, for example, an opalescent resin-made light-transmitting member containing a filler or void for light diffusion. Alternatively, the cover 60 may be a transparent member and may have a lens function of shaping light at the incident surface and the exit surface. The cover 60 has a function of covering and protecting the light-emitting module 30 held by the holder 50 and transmitting or diffusely transmitting the light emitted from the light-emitting module 30.

[0027] The cover 60 has a substantially disk-shaped bottom plate 61 and a peripheral wall 62 erected on the outer peripheral portion of the bottom plate 61, and has a bottomed cylindrical shape capable of accommodating the holder 50. A recess 63 that functions as an engaging portion with the holder 50 is provided on the inner surface of the peripheral wall 62. The cover 60 is fixed to the holder 50 by fitting the recess 63 and a protrusion 54 provided on the holder 50. The inner diameter of the cover 60 is larger than the outer diameter of the holder 50, and the whole of the holder 50 is accommodated inside. On the other hand, the outer diameter of the cover 60 is smaller than the inner diameter of the upper portion of the apparatus main body 10, and the cover 60 is inserted between the apparatus main body 10 and the holder 50.

[0028] The lid portion 70 is made of steel material and is provided above the apparatus main body 10. In this specification, the steel material refers to steel used as an industrial material, and includes ordinary steel, special steel added with various elements, stainless steel, and steel materials whose surfaces are chemically or physically treated. From the viewpoint of not impairing the quasi-fire resistance performance of the building structure, the heat-resistant temperature of the steel material is preferably 800 °C or higher.

[0029] As shown in FIGS. 2 and 3, the lid portion 70 has a base portion 71 and two extending portions 72 connected to the base portion 71 and extending along a direction away from the outer edge of the base portion 71. In the present embodiment, the base portion 71 and the extending portion 72 are made of the same material. When the lighting device 1 is exposed to high temperature and the apparatus main body 10 melts during a fire, the base portion 71 has a function of covering the opening hole 3, and the extending portion 72 has a function of preventing the base portion 71 from falling from the opening hole 3.

[0030] The base portion 71 has a substantially circular shape in a top view and is formed substantially flat. Although details will be described later, the area of the base portion 71 is 80% or more of the opening area of the opening hole 3. Two recesses 73 are provided in the base portion 71. The recess 73 is a cutout portion recessed toward the central portion of the lid portion 70, and the extending portion 72 is connected thereto.

[0031] Four through-holes 74 are provided in the base portion 71. A screw member 75 or a protrusion 20 provided on the apparatus main body 10 is inserted into the through-hole 74. Thereby, the lid portion 70 is fixed to the upper portion of the apparatus main body 10.

[0032] The extension portion 72 extends along a direction away from the outer edge portion of the base portion 71 in a top view of the lid portion 70. Further, the extension portion 72 is disposed on the upper surface of the ceiling material 2 during a fire and supports the base portion 71. In the present embodiment, two extension portions 72 are provided. The two extension portions 72 are arranged point-symmetrically about the central portion of the base portion 71. Thereby, when the apparatus main body 10 melts during a fire, it is possible to further prevent the base portion 71 from falling from the opening hole 3.

[0033] The extension portion 72 has spring properties. When the lighting device 1 is fixed to the ceiling material 2, the extension portion 72 is pressed radially inward and inserted into the ceiling space in a state where the extension portion 72 is pushed inward so as to be able to pass through the opening hole 3. Then, when the extension portion 72 is inserted into the ceiling space and the pressing on the extension portion 72 is released, the extension portion 72 expands in a direction away from the outer edge portion of the base portion 71 by the elastic force. Thereby, during a fire, the extension portion 72 can be disposed on the upper surface of the ceiling material 2 and support the base portion 71.

[0034] The extension portion 72 has a stepped portion 76. More specifically, the extension portion 72 has a first portion 77 having one end connected to the base portion 71 and extending along a direction inclined upward with respect to the upper surface of the base portion 71, and a second portion 78 connected to the other end of the first portion 77 and extending along a direction substantially parallel to the upper surface of the base portion 71. A stepped portion 76 is provided at the boundary between the first portion 77 and the second portion 78. Note that in the present specification, the substantially parallel means that an inclination of about ±5° is allowed. When the apparatus main body 10 melts during a fire, the opening hole 3 provided in the ceiling material 2 abuts against the stepped portion 76. Thereby, since the extension portion 72 has the stepped portion 76, when the apparatus main body 10 melts during a fire, the lid portion 70 is further suppressed from shifting.

[0035] The length of the first portion 77 can be appropriately changed according to the thickness range of the attachable ceiling material 2. The length of the first portion 77 is, for example, 5 mm or more and 50 mm or less. Also, the inclination angle of the first portion 77 with respect to the upper surface of the base portion 71 is, for example, 45° or more and 90° or less.

[0036] The second portion 78 is arranged on the upper surface of the ceiling material 2 when the device main body 10 melts during a fire. The size of the second portion 78 is not particularly limited as long as it can support the base portion 71 and prevent the base portion 71 from falling from the opening hole 3.

[0037] In the present embodiment, the lid portion 70 has two extending portions 72, but the number of extending portions 72 is not limited thereto. The lid portion 70 may have three or more extending portions 72. In this case, it is more effectively prevented that the base portion 71 falls from the opening hole 3. Even when the lid portion 70 has three or more extending portions 72, it is preferable that the extending portions 72 are arranged at equal angular intervals around the central portion of the base portion 71.

[0038] Next, with reference to FIGS. 4 and 5, the arrangement relationship between the lid portion 70 and the opening hole 3 of the ceiling material 2 in the state where the lighting device 1 is attached to the ceiling material 2 will be described in detail. FIG. 4 is a view of the lighting device 1 as seen from above in the state where the lighting device 1 is attached to the ceiling material 2. FIG. 5 is a view showing how the lid portion 70 is arranged on the ceiling material 2 during a fire.

[0039] As shown in Fig. 4, in a top view of the lid portion 70, the lid portion 70 is arranged such that the central portion of the base portion 71 overlaps with the central portion of the opening hole 3. And the base portion 71 covers 80% or more of the opening area of the opening hole 3. Thereby, when the lighting device 1 is exposed to high temperature during a fire and the device main body 10 melts, the spread of the flame through the opening hole 3 is suppressed. Further, from the viewpoint of further suppressing the spread of the flame through the opening hole 3, it is more preferable that the base portion 71 covers 85% or more of the opening area of the opening hole 3, and it is even more preferable that it covers 90% or more. Also, from the viewpoint of workability when embedding the lighting device 1 behind the ceiling material 2 through the opening hole 3, it is preferable that the base portion 71 covers 98% or less of the opening area of the opening hole 3.

[0040] As shown in Fig. 5, even when the lighting device 1 is exposed to high temperature during a fire and the device main body 10 melts, the lid portion 70 is made of steel and thus does not melt. And the extending portion 72 is arranged on the upper surface of the ceiling material 2 and supports the base portion 71. Thereby, the lid portion 70 is prevented from falling from the opening hole 3.

[0041] [Second Embodiment] The lighting device 1A which is the second embodiment will be described with reference to Figs. 6 and 7. Fig. 6 is a perspective view of the lighting device 1A, and Fig. 7 is a view of the lighting device 1A seen from above in a state where the lighting device 1A is attached to the ceiling material 2. Hereinafter, for the configurations common to the first embodiment, the same reference numerals will be used and the overlapping descriptions will be omitted, and mainly the differences from the first embodiment will be described.

[0042] As shown in Figs. 6 and 7, the shape of the lid portion 70 of the lighting device 1A is different from that of the lighting device 1 of the first embodiment. More specifically, the lid portion 70 of the lighting device 1 of the second embodiment has one extending portion 72.

[0043] Similar to the first embodiment, one end of the extension part 72 is connected to the base part 71, and it has a first part 77 extending along a direction inclined upward with respect to the upper surface of the base part 71, and a second part 78 connected to the other end of the first part 77 and extending along a direction substantially parallel to the upper surface of the base part 71. On the other hand, in the top view of the lid part 70, the second part 78 of the second embodiment extends more outward than the second part 78 of the first embodiment. As a result, in the top view of the lid part 70, the center of gravity position of the lid part 70 is located outside the opening hole 3. Thereby, even if the number of the extension parts 72 is one, when the apparatus main body 10 melts during a fire, it is possible to prevent the lid part 70 from falling from the opening hole 3.

[0044] The size and shape of the second part 78 are not particularly limited as long as the center of gravity position of the lid part 70 can be located outside the opening hole 3 in the top view of the lid part 70. In the present embodiment, the second part 78 has a rectangular shape in the top view.

[0045] Next, a method for fixing the lighting device 1A of the second embodiment to the ceiling material 2 will be described. As described above, the second part 78 of the lid part 70 extends greatly outward from the central part of the lid part 70. Therefore, when fixing the lighting device 1A to the ceiling material 2, the lighting device 1A is tilted, and first, the second part 78 is inserted into the ceiling space. Then, after the second part 78 is inserted into the ceiling space, the inclination of the lighting device 1A is restored to the original direction, and the entire lighting device 1A is inserted into the ceiling space while folding the mounting spring 40. Thereby, the lighting device 1A can be fixed to the ceiling material 2.

[0046] [Third Embodiment] Referring to FIG. 8, the lighting device 1B which is the third embodiment will be described. FIG. 8 is a perspective view of the lighting device 1B. Hereinafter, for the configurations common to the first embodiment and the second embodiment, the same reference numerals are used and the overlapping descriptions are omitted, and mainly the differences from the first embodiment and the second embodiment will be described.

[0047] As shown in FIG. 8, the lighting device 1B is disposed outside the device main body 10 and further includes a control device 80 that controls the lighting device 1B. Although details will be described later, the control device 80 functions as a weight for preventing the lid portion 70 from falling through the opening hole 3 during a fire.

[0048] The control device 80 is disposed in the ceiling space, similarly to the device main body 10 in which the light emitting module 30 is incorporated. Here, as described above, the control device 80 is structurally separated from the device main body 10. Therefore, the control device 80 and the device main body 10 are disposed at different locations in the ceiling space. The control device 80 is connected to a power connector 90 that supplies power to the control device 80. Note that the power connector 90 may be incorporated in the control device 80.

[0049] The control device 80 includes a control unit (not shown) that controls the lighting device 1B and a housing 81 that houses the control unit. The control unit includes, for example, a wireless communication module that receives an operation signal based on an operation of a remote controller (not shown) of the lighting device 1B, and a control module that controls the power supplied to the light emitting module 30 based on the operation signal.

[0050] The housing 81 is made of steel. That is, the outer shell of the control device 80 that functions as a weight is made of steel. By configuring the housing 81 with steel, the control device 80 does not melt even when exposed to high temperatures during a fire, and the control device 80 can be left in the ceiling space. The housing 81 is provided with an engagement hole 82 that engages with an engagement claw 79 provided on the lid portion 70 described later.

[0051] Here, in a top view of the lid portion 70, the center of gravity position of the combined body of the lid portion 70 and the control device 80 is located outside the opening hole 3. Thereby, it is possible to suppress the lid portion 70 from falling through the opening hole 3 during a fire. The size, shape, weight, arrangement, etc. of the control device 80 are not particularly limited as long as the center of gravity position of the combined body of the lid portion 70 and the control device 80 can be located outside the opening hole 3.

[0052] In this embodiment, the lid portion 70 has a base portion 71 and an extension portion 72, similar to the first and second embodiments. An engaging claw 79 that can be inserted into an engaging hole 82 provided in the control device 80 is provided at the end of the extension portion 72. Note that the lid portion 70 may have only the base portion 71 without the extension portion 72. In that case, an engaging claw 79 that can be inserted into the engaging hole 82 provided in the control device 80 is provided on the outer edge of the base portion 71.

[0053] As described above, according to the lighting devices 1, 1A, and 1B having the above configuration, even when the device main body 10 is made of a material with a melting point lower than that of iron, in the event of a fire, the lid portion 70 closes most of the opening hole 3 provided in the ceiling material 2. And since the extension portion 72 provided on the lid portion 70 suppresses the lid portion 70 from falling from the opening hole 3, it becomes easy to suppress the spread of the flame through the opening hole 3.

[0054] Note that each of the above embodiments can be appropriately modified in design without impairing the object of the present disclosure. For example, other components such as a control device may be interposed between the lid portion 70 and the device main body 10. Also, in the above embodiments, the protruding portions 13, 14, 15, and 16 are provided on the upper surface of the top plate portion 12, that is, inside the cylindrical wall portion 11, but they may be provided outside the cylindrical wall portion 11. Further, the light emitting module 30, the holder 50, and the cover 60 may be replaced with a lamp having a light emitting portion and a socket for attaching the lamp.

[0055] The present disclosure will be further described by the following embodiments. Configuration 1: An embedded lighting device attached to an opening provided in a ceiling material, comprising: a cylindrical device body at least partially made of a material with a melting point lower than that of iron; a light-emitting module provided inside the device body; a mounting spring for fixing the device body to the opening; and a lid portion provided above the device body and made of steel. The lid portion has, in a top view of the lid portion, a base portion covering 80% or more of the opening area of the opening, and an extension portion connected to the base portion and extending along a direction away from the outer edge of the base portion. When the lid portion is disposed on the upper surface of the ceiling material, the extension portion is disposed on the upper surface of the ceiling material and supports the base portion. Lighting device. Configuration 2: The lighting device according to Configuration 1, wherein the extension portion has springiness and expands in a direction away from the outer edge portion of the base portion by an elastic force. Configuration 3: The lighting device according to Configuration 1 or 2, wherein the extension portion has a stepped portion. Configuration 4: The lighting device according to any one of Configurations 1 to 3, wherein, in a top view of the lid portion, the center of gravity position of the lid portion is located outside the opening. Configuration 5: An embedded lighting device attached to an opening provided in a ceiling material, comprising: a cylindrical device body made of a material with a melting point lower than that of iron; a light-emitting module provided inside the device body; a mounting spring for fixing the device body to the opening; a lid portion provided above the device body and made of steel; and a weight disposed outside the device body and engaging with the lid portion. The lid portion has, in a top view of the lid portion, a base portion covering 80% or more of the opening area of the opening, and the weight has an outer shell made of steel. In a top view of the lid portion, the center of gravity position of the combined body of the lid portion and the weight is located outside the opening. Lighting device.

Explanation of Reference Numerals

[0056] 1, 1A, 1B Lighting device, 2 Ceiling member, 3 Opening hole, 10 Device body, 11 Cylindrical wall portion, 12 Ceiling portion, 13, 14, 15, 16 Protrusion, 17 Flange portion, 18, 19 Through hole, 20 Protrusion, 21 Support portion, 30 Light-emitting module, 40 Mounting spring, 50 Holder, 51 Bottom plate, 52 Peripheral wall, 53 Window hole, 54 Protrusion, 60 Cover, 61 Bottom plate, 62 Peripheral wall, 63 Recess, 70 Cover portion, 71 Base portion, 72 Extension portion, 73 Recess, 74 Through hole, 75 Screw member, 76 Step portion, 77 First portion, 78 Second portion, 79 Engagement portion, 80 Control device (weight), 81 Housing, 82 Engagement hole, 90 Power connector

Claims

1. An embedded lighting device to be attached to an opening provided in a ceiling member, comprising: A cylindrical device body made of a material having a melting point lower than that of iron at least in part; A mounting spring for fixing the device body to the opening; A lid portion provided above the device body and composed of a steel material; The lighting device further comprising: The lid portion has: A base portion that covers 80% or more of the opening area of the opening in a top view of the lid portion; An extension portion connected to the base portion and extending along a direction away from the outer edge of the base portion; The lighting device, when the lid portion is disposed on the upper surface of the ceiling member, the extension portion is disposed on the upper surface of the ceiling member and supports the base portion.

2. The lighting device according to claim 1, wherein the extension portion has spring properties and expands in a direction away from the outer edge portion of the base portion by an elastic force.

3. The lighting device according to claim 1, wherein the extension portion has a stepped portion.

4. The lighting device according to claim 1, wherein in a top view of the lid portion, the center of gravity position of the lid portion is located outside the opening.

5. An embedded lighting device to be attached to an opening provided in a ceiling member, comprising: A cylindrical device body made of a material having a melting point lower than that of iron at least in part; A mounting spring for fixing the device body to the opening; A lid portion provided above the device body and composed of a steel material; A weight disposed outside the device body and engaging with the lid portion; The lighting device further comprising: The lid portion has a base portion that covers 80% or more of the opening area of the opening in a top view of the lid portion; The weight has an outer shell made of a steel material; The lighting device, wherein in a top view of the lid portion, the center of gravity position of the combined body of the lid portion and the weight is located outside the opening. ​

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