Lighting device, lid-attached lighting device, lid member, and ceiling structure

Abstract

To provide a lid-attached lighting device and the like improving flame shielding performance of a ceiling when a fire occurs.SOLUTION: A lid-attached lighting device 1 has a storage part 2 housed in a hole formed into a ceiling, and is fixed to the periphery of the hole. The lid-attached lighting device 1 includes: a housing 15 made of material having a melting point lower than that of steel; a light source disposed in the housing 15 and emitting light to the lower side in a height direction; and a lid member 50 fixed to the housing 15 and including a lid part 51 covering at least part of the upper surface of the housing 15. The lid member 50 is constituted of noncombustible material. The lid member 50 includes a ceiling hook part 52 not superimposed on the housing 15 when seen from a height direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a lighting device, a lighting device with a lid in which a lid member is fixed to the upper side, a lid member fixed to the upper side of the lighting device, and a ceiling structure including a ceiling and a lighting device with a lid fixed thereto.

Background Art

[0002] Conventionally, as a lighting device, there is one described in Patent Document 1. This lighting device includes a light source, a cylindrical housing that houses the light source, three mounting springs that are attached to the outer peripheral surface of the housing at equal intervals in the circumferential direction and protrude outward, and a power supply device that supplies power to the light source. The housing has a housing portion that is housed in a hole provided in the ceiling. This lighting device is fixed to the ceiling by locking the mounting springs to the bottom surface of the attic.

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 the floor, wall, and roof, the regulations for the ceiling structure of the building are ambiguous.

[0005] In this context, when the housing of the lighting device of Patent Document 1 is made of a material other than iron, for example, aluminum, the housing will be placed in a temperature environment far higher than its melting point during a fire and will 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, an object of the present disclosure is to provide a lighting device and the like such that, even when the housing of the lighting device melts in the event of a fire, the portion subject to the provisions of the fire-resistant structure can more easily meet the provisions of the fire-resistant structure. Furthermore, it becomes possible to suppress the collapse of the installed building or, even if the building collapses, to extend the time until collapse.

Means for Solving the Problems

[0006] To solve the above problems, the covered lighting device according to the present disclosure is a lighting device having a housing portion housed in a hole provided in the ceiling and fixed around the hole, comprising a housing made of a material with a melting point lower than that of iron, a light source disposed within the housing and emitting light downward in the height direction, and a cover member fixed to the housing and including a cover portion covering at least a part of the upper surface of the housing. The cover member is made of a non-combustible material and includes a ceiling hook portion that does not overlap the housing when viewed in the height direction.

[0007] Also, the lighting device according to the present disclosure is a lighting device having a housing portion housed in a hole provided in the ceiling and fixed around the hole, comprising a housing made of a material with a melting point lower than that of iron, and a light source disposed within the housing and emitting light downward in the height direction. One or more cover fixing portions are provided on the housing, and a cover member including a cover portion covering at least a part of the upper surface of the housing can be attached to the housing using the cover fixing portions.

Advantages of the Invention

[0008] According to the lighting device and the like according to the present disclosure, the flame shielding performance of the ceiling during a fire can be improved.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. When a plurality of embodiments, modified examples, etc. are included below, it is initially assumed that new embodiments can be constructed by appropriately combining their characteristic parts. In the following examples, the same components are denoted by the same reference numerals in the drawings, and redundant explanations are omitted. The plurality of drawings include schematic diagrams, and the dimensional ratios of each member in the vertical, horizontal, height, etc. directions may not necessarily match between different drawings.

[0011] Among the components described below, components not described in the independent claims indicating the most general concept are arbitrary components and not essential components. The lower side in the height direction of the lid-equipped lighting device (lighting device) 1, 101 is the light emission direction of the light source 22, and the upper side in the height direction is the side opposite to the light emission direction of the light source 22. The height direction of the lid-equipped lighting device (lighting device) 1, 101 coincides with the thickness direction of the substrate 21 on which the light-emitting element is mounted. In the lid-equipped lighting device (lighting device) of the present embodiment described below, the light emission direction substantially coincides with the substantially vertical direction. However, the light emission direction does not necessarily have to coincide with the vertical direction. For example, the lid-equipped lighting device (lighting device) of the present disclosure may be a universal type lid-equipped lighting device (lighting device), and the light emission direction may be freely inclined with respect to the vertical direction. Also, in the lid-equipped lighting device (lighting device) of the present embodiment, the light emission direction substantially coincides with the orthogonal direction orthogonal to the extending direction of the ceiling (the planar direction (two-dimensional direction) in which the ceiling extends). However, the light emission direction does not necessarily have to coincide with the orthogonal direction. For example, the lid-equipped lighting device (lighting device) of the present disclosure may be a lid-equipped lighting device (lighting device) for an inclined ceiling, and the light emission direction may be a direction inclined in the orthogonal direction orthogonal to the extending direction of the ceiling. In a universal type lid-equipped lighting device (lighting device) or a lid-equipped lighting device (lighting device) for an inclined ceiling, when the height direction does not substantially coincide with the orthogonal direction orthogonal to the extending direction of the ceiling, the lid member does not have to extend in a direction orthogonal to the height direction, and for example, may extend substantially parallel to the ceiling back. It is preferable that at least a part of the ceiling hanging portion overlaps the ceiling when viewed from the vertical direction with the lid-equipped lighting device installed on the ceiling.

[0012] FIG. 1 is a perspective view of the lighting device 1 with a cover when viewed obliquely from above. Referring to FIG. 1, the lighting device 1 with a cover has a housing portion 2 that is housed in a hole 8 provided in a ceiling 7 (see FIG. 10) and is fixed around the hole 8 of the ceiling 7. The lighting device 1 with a cover includes a lighting device 10 and a cover member 50 fixed above the lighting device 10. Further, the lighting device 10 has a housing 15 to which the cover member 50 is fixed on the upper side, a light source 22 (see FIG. 9) disposed in the housing 15 and emitting light downward, and a plurality of mounting springs 70 attached to a spring mounting portion 14 of the housing 15.

[0013] The housing 15 is made of a material having a melting point lower than that of iron, for example, aluminum, resin, or the like. When the housing 15 is made of aluminum, compared with the case where iron is used as the housing material, the housing 15 is made using aluminum die-casting to increase the degree of freedom in shape and further improve the heat dissipation of the heat generated from the light source. Also, even when the housing 15 is made of resin, compared with the case where iron is used as the housing material, the housing 15 can be manufactured at a lower cost.

[0014] The cover member 50 is made of a non-combustible material and a heat insulating material, and is made of a material that can be deformed when passing through the hole 8 and can return to its original shape after passing through the hole 8. The cover member 50 is made of, for example, glass wool, rock wool, or a sheet of a non-combustible material having a restoring force. The cover member 50 includes a cover portion 51 that covers at least a part of the upper surface 18 (see FIG. 2) of the housing 15 and a ceiling hanging portion 52 that does not overlap the housing 15 when viewed in the height direction.

[0015] FIG. 2 is a diagram for explaining a method of fixing the cover member 50 to the housing 15. As shown in FIG. 2, the housing 15 has a plurality of boss portions 12 protruding upward in the height direction, and in this embodiment, has two boss portions 12. The plurality of boss portions 12 are arranged at intervals from each other, and a bottomed screw hole 13 extending in the height direction is provided at the center of the boss portion 12. The screw hole 13 is an example of a cover fixing portion. The screw hole 13 opens upward in the height direction.

[0016] The lid member 50 has a flat plate shape and has a plurality of notches 53. The plurality of notches 53 are arranged at intervals in the circumferential direction, and preferably, are arranged at equal intervals in the circumferential direction. In the present embodiment, the lid member 50 has a disc shape, and a plurality of notches 53 are provided at equal intervals in the circumferential direction on the outer peripheral side of the lid member 50. The notch 53 penetrates the lid member 50 in the height direction and has an opening on the outer peripheral side. The notch 53 has a shape of an isosceles triangle with a curved top when viewed in plan view from the height direction. The circumferential length of the notch 53 increases as it goes to the outer peripheral side. The shape of the notch 53 in plan view may be any shape other than a substantially isosceles triangle, for example, an elliptical shape, a semi-circular shape, or the like.

[0017] The lid member 50 has a plurality of through holes 54 spaced apart radially inward from the notch 53. In the present embodiment, it has two through holes 54. The through hole 54 is composed of a cylindrical hole. The through hole 54 is an example of a fixing portion. The lid member 50 can be placed on the upper surface 18 of the housing 15 so that the centers of the plurality of through holes 54 overlap the centers of the plurality of screw holes 13 when viewed from the height direction. By passing the shaft portion 9a of the bolt 9 through the through hole 54 from above the lid member 50 and then tightening it into the screw hole 13, the lid member 50 is fixed to the housing 15. More preferably, the bolt 9 is made of a material having a lower melting point than the material of the housing 15. Since the bolt 9 is made of a material with a low melting point, it melts earlier than the housing 15 in the event of a fire, thereby eliminating the fastening relationship with the housing 15 and suppressing the lid member 50 from falling from the hole 8 in the ceiling 7 together with the housing 15 during the melting of the housing 15. For example, when the housing 15 is made of aluminum, the bolt 9 may be made of polycarbonate. By fixing the lid member 50 to the housing 15 using a plurality of fixing portions, relative rotation of the lid member 50 with respect to the housing 15 can be prevented, and the lid member 50 can be positioned with high precision with respect to the housing 15.

[0018] On the outer peripheral surface of the housing 15, a plurality of spring attachment portions 14 are provided at intervals from each other. The attachment spring 70 is attached to the spring attachment portion 14. The attachment spring 70 is made of an elastic metal, for example, spring steel or the like. The attachment structure of the attachment spring 70 will be described in detail later. With the attachment spring 70 fixed to the housing 15, the tip side of the attachment spring 70 extends in a substantially radial direction (a direction orthogonal to the height direction). The attachment spring 70 is attached to a predetermined position of the housing 15 and is positioned with high precision with respect to the housing 15.

[0019] Since both the lid member 50 and the attachment spring 70 are positioned with high precision with respect to the housing 15, the relative position of the lid member 50 with respect to each attachment spring 70 is uniquely determined. As shown in FIG. 1, when viewed from the height direction, at least a part of each attachment spring 70 overlaps with the notch 53. In other words, the plurality of notches 53 include notches 53 formed at the same circumferential position as the attachment spring 70.

[0020] The lighting device 1 with a lid is fixed to the periphery of the hole 8 in the ceiling 7 as follows. First, the attachment spring 70 is elastically deformed so that the tip portion of each attachment spring 70 faces upward in the height direction. Further, the outer peripheral portion of the lid member 50 is bent downward in a substantially frustum shape over the entire circumference. At this time, the width of the notch 53 corresponding to the attachment spring 70 is deformed to be widened, at least a part of the tip side of the attachment spring 70 is accommodated in the notch 53, and the outer diameter of the lighting device 1 with a lid is reduced. The lighting device 1 with a lid is designed to be able to pass through the hole 8 in the ceiling 7 in a state where the outer diameter is reduced.

[0021] The lighting device 1 with a lid is inserted into the hole 8 from below in a state where the outer diameter is reduced. The lid member 50 returns to the original disk shape on the ceiling back after passing through the hole 8. Further, when the housing 15 is inserted into the hole 8 at a predetermined height, the tip side of the attachment spring 70 spreads radially so as to follow the bottom surface 19 (see FIG. 10) of the ceiling back by the restoring force. By locking the tip side of the attachment spring 70 to the bottom surface of the ceiling back, the lighting device 1 with a lid is fixed to the ceiling 7.

[0022] As shown in FIG. 1, in the present embodiment, the lighting device 1 with a lid has six notches 53 that are equally spaced in the circumferential direction. In addition to the specification in which two mounting springs 70 are fixed to the housing 15 at intervals of 180° in the circumferential direction as in the present embodiment, there is also a specification in which three mounting springs are fixed to the housing at intervals of 120° in the circumferential direction (see FIG. 11). When six notches 53 are provided at equal intervals in the circumferential direction as in the present embodiment, the notches 53 are provided at intervals of 60° in the circumferential direction. Therefore, the lid member 50 can be used in both the specification with two mounting springs 70 and the specification with three mounting springs. Thus, the versatility of the lid member 50 is enhanced, and the lid member 50 can be mass-produced.

[0023] In a state where the lighting device 1 with a lid is fixed to the ceiling 7, the center of the hole 8 in the ceiling 7 and the center of the lid member 50 overlap in the height direction. Further, in a state where the lighting device 1 with a lid is fixed to the ceiling 7, the outer peripheral side of the ceiling hanging portion 52 overlaps the bottom surface 19 on the back side of the ceiling in the height direction over the entire circumference. Further, when viewed from the height direction, all of the holes 8 overlap the lid member 50. More specifically, when viewed from the height direction, all of the holes 8 overlap the central portion 58 (see FIG. 1) located radially inward of the notch 53 in the lid member 50.

[0024] Next, the internal structure of the lighting device 1 with a lid will be described. FIG. 3 is a perspective view of the lighting device 1 with a lid when viewed obliquely from the lower side. As shown in FIG. 3, the lighting device 1 with a lid has a structure in which a light source unit 75 and a sensor unit 85 are arranged adjacent to each other. FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3, and FIG. 5 is an exploded perspective view of the main part of the lighting device 1 with a lid. As shown in FIG. 4, the housing 15 has a sensor unit housing recess 35 whose side is surrounded by a first side wall portion 31 over the entire circumference and whose upper side is open, and a light source fixing portion 37 whose side is surrounded by a second side wall portion 36 over the entire circumference and whose lower side is open.

[0025] Referring to FIG. 5, after the sensor unit 85 is housed in a predetermined position of the sensor unit housing recess 35, it is screwed to the housing 15. The sensor unit 85 and the light source unit 75 are supplied with AC power from an external power source such as a commercial power supply to a control power supply device (not shown). The control power supply device, for example, converts the supplied AC power into DC power by performing rectification processing and smoothing on the supplied AC power and steps down the voltage to a predetermined voltage, and while supplying the converted DC power to the light source unit 75, performs lighting control on the light source unit 75 according to the signal of the sensor unit 85. The sensor unit 85 is, for example, a human presence sensor, a brightness sensor, or the like. Although the case where the power supply device is arranged outside the housing has been described, the power supply device may be arranged inside the housing.

[0026] As shown in FIG. 4, the light source unit 75 is fixed to the housing 15 by a snap fit. Specifically, the light source unit 75 has locking claws 79 having elasticity on the outer peripheral side, and locking recesses 46 are provided on the inner peripheral surface of the second side wall portion 36. The light source unit 75 is inserted into the light source fixing portion 37 from below with the locking claws 79 distorted radially inward. When the locking claws 79 are inserted to the same height as the locking recesses 46, the locking claws 79 expand radially outward by elastic force and engage with the locking recesses 46. By this engagement, the light source unit 75 is fixed to the light source fixing portion 37. The light source unit may be fixed to the housing with a structure other than a snap fit, for example, it may be screwed to the housing.

[0027] As shown in FIG. 5, the housing 15 has a flange portion 27 on the lower side. An annular sealing material 90 is placed on the housing 15 from above and placed on the flange portion 27. When the lighting device 1 with a lid is attached to the ceiling 7, the sealing material 90 functions to ensure airtightness between the indoor and outdoor areas and prevent insects by filling the gap between the flange portion 27 and the back surface of the bottom surface 19 on the back side of the ceiling. The spring attachment portion 14 of the housing defines a pair of grooves extending in the height direction with a gap therebetween. The attachment spring 70 is fixed to the housing 15 by press-fitting both end portions in the width direction of the wide portion 72 located above the housing attachment portion 71 of the attachment spring 70 into the pair of grooves from above. At this time, as shown in FIG. 1, the bent portion 74 of the attachment spring 70 is housed in a recess 91 (see FIG. 5) provided on the inner peripheral side of the frame member 90. Thereby, the positioning of the frame member 90 with respect to the housing 15 is performed.

[0028] As shown in FIG. 6, a bendable locking portion 76 is provided at the upper central portion of the housing attachment portion 71 of the attachment spring 70, and an engaging recess 78 that opens to the radially outer side is provided in the housing 15. By bending the locking portion 76 inward in the radial direction and locking it to the engaging recess 78, the attachment spring 70 is securely fixed to the housing 15. Note that the spring attachment portion may be configured in any structure that can fix the attachment spring. For example, the spring attachment portion may be configured with a screw hole or the like, and the attachment spring may be screwed to the housing. As shown in FIG. 5, the lighting device 1 with a lid has a sealing member 95 that closes the opening of the power supply housing recess 35. After the sealing member 95 is screwed to the housing 15, the lid member 50 is screwed to the housing 15.

[0029] Next, the configuration of the light source unit 75 will be described. FIG. 7 is a perspective view of the light source unit 75 as seen from the upper diagonal side, and FIG. 8 is a perspective view of the light source unit 75 as seen from the lower diagonal side. Further, FIG. 9 is a perspective view of the light source module 25 as seen from the lower diagonal side. As shown in FIGS. 4 and 7, the light source unit 75 has a plate-shaped substrate fixing portion 77 that extends in an orthogonal direction orthogonal to the height direction. As shown in FIG. 8, the light source unit 75 has an optical member 81 including a dome-shaped emission surface 82 that covers the lower side. The optical member 81 may be, for example, a lens made of a highly transparent resin such as acrylic resin, polycarbonate, silicone, or glass, or a light-transmissive cover made of a light-transmissive material and having no lens function.

[0030] As shown in FIG. 9, the light source module 25 has a substrate 21 and a light source 22. The substrate 21 has a substantially rectangular flat plate shape in plan view and is fixed to the lower surface of the substrate fixing portion 77 by screwing or the like. Further, the light source 22 has a disk shape and is disposed substantially at the center of the lower surface (mounting surface) of the substrate 21. The light source module 25 has, for example, a COB (Chip On Board) structure, and the light source 22 includes a plurality of LEDs (light emitting diodes) mounted on the substrate 21 and a sealing member 28 that seals the plurality of LEDs.

[0031] The substrate 21 is made of, for example, a ceramic substrate, a resin substrate, or a metal base substrate. Although not described in detail, a pair of electrode terminals and metal wiring in a predetermined pattern are formed on the substrate 21. The pair of electrode terminals are provided to receive DC power from the outside for causing the LEDs to emit light. Further, the metal wiring in a predetermined pattern is provided to electrically connect the LEDs to each other.

[0032] The LED is composed of, for example, bare chips that emit single-color visible light, and is composed of blue LED chips that emit blue light when energized. A plurality of LEDs are arranged in a matrix on, for example, a substrate 21. Note that only one LED may be mounted on the substrate. The sealing member 28 is composed of, for example, a translucent resin and contains a phosphor. The phosphor serves to convert the light from the LED in wavelength. The sealing member 28 is composed of, for example, a phosphor-containing resin in which phosphor particles are dispersed in a silicone resin. When the light source module 25 emits white light and the LED is a blue LED chip that emits blue light, the phosphor particles are composed of, for example, YAG-based yellow phosphors.

[0033] The sealing member 28 may seal all the LEDs together, may seal the plurality of LEDs linearly for each column, or may seal each LED individually one by one. Further, the light source may include a light-emitting element other than an LED, and may be composed of a semiconductor laser element, a solid light-emitting element such as an organic EL (Electro Luminescence) element or an inorganic EL element, etc. Or, the light source may be composed of an incandescent lamp.

[0034] Next, the operation and effect of the lighting device 1 with a lid of the present disclosure will be described. Assume that a fire breaks out after the lighting device 1 with a lid is appropriately fixed to the ceiling 7 and the temperature in the room communicating with the hole 8 rises to 800 °C or higher. Then, the lighting device 10 melts and drops downward. However, since the lid member 50 is composed of a non-combustible material, it does not melt and drops downward, and as shown in FIG. 10, it catches on the bottom surface 19 of the ceiling space in a state where it blocks all of the upper openings of the hole 8 provided in the ceiling 7.

[0035] Therefore, it is possible to prevent the fire from spreading to the floor of the upper floor through the hole 8, so that it becomes difficult for the fire to spread to the upper floor, and the floor surface that is the subject of the regulations of the quasi-fire-resistant structure can more easily satisfy the regulations of the quasi-fire-resistant structure, and it becomes possible to provide a lighting device or the like. Further, the collapse of the building is suppressed, and even if the building collapses, the time until collapse becomes longer. Thus, it becomes easier for people to evacuate, and the safety of the building against fire can be improved.

[0036] As described above, the covered lighting device 1 has a housing portion 2 that is housed in a hole 8 provided in the ceiling 7 and is fixed around the hole 8. The covered lighting device 1 includes a housing 15 made of a material with a melting point lower than that of iron, a light source 22 disposed within the housing 15 and emitting light downward in the height direction, and a cover member 50 that is fixed to the housing 15 and includes a cover portion 51 covering at least a part of the upper surface of the housing 15. The cover member 50 is made of a non-combustible material. The cover member 50 includes a ceiling hanging portion 52 that does not overlap the housing 15 when viewed in the height direction.

[0037] According to the present disclosure, by providing a portion where the ceiling hanging portion 52 does not overlap the hole 8 in the ceiling 7 in the height direction in the installed state of the covered lighting device 1, in the event of a fire, when the housing 15 melts and drops, at least a part of the opening of the hole 8 can be blocked by the cover member 50. Therefore, it becomes difficult for the fire to spread to the upper floor through the hole 8, and it is possible to provide a lighting device or the like that can more easily satisfy the requirements of the quasi-fireproof structure for the floor surface that is the subject of the quasi-fireproof structure regulations. Also, the collapse of the building is suppressed, and even if the building collapses, the time until collapse becomes longer. Thus, it becomes easier for people to evacuate, and the safety of the building against fire can be improved.

[0038] Further, the non-combustible material constituting the cover member 50 may be a material that can be deformed when passing through the hole 8 and can return to its original shape after passing through the hole 8.

[0039] According to this configuration, after attaching the cover member 50 to the lighting device 10 to manufacture the covered lighting device 1, the covered lighting device 1 can be easily installed on the ceiling 7 simply by inserting the covered lighting device 1 into the hole 8 from below the ceiling 7.

[0040] Further, the non-combustible material constituting the cover member 50 may be a heat insulating material.

[0041] According to this configuration, it becomes difficult for heat to be conducted to the upper floor through the hole 8, and the occurrence of a fire on the upper floor can be delayed.

[0042] Further, the lid member 50 may be fixed to the housing 15 and have two or more fixing portions (through holes 54) positioned at intervals from each other, and the lighting device 1 with a lid may include a plurality of mounting springs 70 attached to the spring mounting portion 14 of the housing 15. Further, the lid member 50 may have a flat plate shape and may have a plurality of notches 53 arranged at intervals in the circumferential direction and having an open outer peripheral side. And when viewed from the height direction, at least a part of each mounting spring 70 may overlap with the notch 53.

[0043] According to this configuration, when inserting the lighting device 1 with a lid into the hole 8 from below the ceiling 7, a part of the tip side of each mounting spring 70 directed upward can be held by the notch 53 of the lid member 50 whose peripheral edge is bent downward. Therefore, it is easy to stably maintain the state where the outer diameter of the lighting device 1 with a lid is small, and it is easy to insert the lighting device 1 with a lid into the hole 8.

[0044] Further, the lighting device 10 has a housing portion 2 housed in a hole 8 provided in the ceiling 7 and is fixed to the periphery of the hole 8. The lighting device 10 includes a housing 15 made of a material having a melting point lower than that of iron, and a light source 22 disposed in the housing 15 and emitting light downward in the height direction. One or more lid fixing portions (screw holes 13) are provided in the housing 15. A lid member 50 including a lid portion 51 that covers at least a part of the upper surface of the housing 15 can be attached to the housing 15 using the lid fixing portion.

[0045] According to the present disclosure, if necessary, a lid member 50 can be attached to the lighting device 10, and a lighting device 1 with a lid that can improve the fire resistance of the building can be installed.

[0046] Further, the lid member 50 is fixed to the lighting device 10 provided with one or more lid fixing portions (screw holes 13). The lid member 50 includes a lid portion 51, a fixing portion (through hole 54) fixed to the housing 15 using the lid fixing portion, and a ceiling hanging portion 52 that does not overlap with the housing 15 when viewed from the height direction in a state of being fixed to the lighting device 10.

[0047] According to the present disclosure, if necessary, a lid member 50 can be attached to the lighting device 10, and a lighting device 1 with a lid that can improve the fire resistance of a building can be installed.

[0048] Further, the lighting device 10 may include a plurality of mounting springs 70 attached to the spring attachment portion 14 of the housing 15. The housing 15 may be provided with a plurality of lid fixing portions arranged at intervals from each other. The lid member 50 may be in a flat plate shape and may have a plurality of notches 53 arranged at intervals in the circumferential direction and having an open outer peripheral side. Also, when viewed from the height direction in a state where the lid member 50 is attached to the lighting device 10, at least a part of each mounting spring 70 may overlap with the notch 53.

[0049] According to this configuration, it is easy to stably maintain the state where the outer diameter of the lighting device 1 with a lid is small, and it is easy to insert and fix the lighting device 1 with a lid into the hole 8.

[0050] Further, the ceiling structure of the present disclosure includes a lighting device 1 with a lid and a ceiling 7 having a hole 8. Also, when viewed from the height direction, at least a part of the ceiling hanging portion 52 overlaps with the back of the ceiling.

[0051] According to the present disclosure, a ceiling structure with good fire resistance can be produced while the lighting device 10 is installed.

[0052] Also, in the ceiling structure, when viewed from the height direction, all of the holes 8 may overlap with the lid member 50.

[0053] According to this configuration, when the lighting device 10 melts and drops due to a fire, all of the holes 8 can be covered with the lid member 50. Therefore, a ceiling structure with excellent fire resistance can be realized.

[0054] Note that the present disclosure is not limited to the above-described embodiments and their modifications, and various improvements and changes are possible within the scope of the matters described in the claims of the present application and their equivalent scope.

[0055] For example, in a universal type lighting device with a cover (lighting device) or a lighting device with a cover for an inclined ceiling (lighting device), the height direction may not substantially coincide with the orthogonal direction orthogonal to the extending direction of the ceiling. Considering this, the lighting device with a cover of the present disclosure is a lighting device that has a housing portion accommodated in a hole provided in the ceiling and is fixed around the hole, and includes a housing made of a material having a melting point lower than that of iron, a light source disposed in the housing and emitting light downward in the height direction, and a cover member fixed to the housing and covering at least a part of the upper surface of the housing. Further, the cover member may be made of a non-combustible material. Further, the cover member may include a ceiling hanging portion at least a part of which overlaps the ceiling when viewed from the vertical direction. In other words, the cover member may include a ceiling hanging portion, and at least a part of the ceiling hanging portion may overlap the ceiling when viewed from the vertical direction. Even in this case, when a fire occurs, the collapse of the building can be suppressed, and even when the building collapses, the time until collapse can be lengthened.

[0056] In addition, the case where the cover member 50 is screwed to the lighting device 10 has been described. However, the cover member may be fixed to the lighting device by other fixing means, for example, fixed to the lighting device by a double-sided tape, an adhesive, or the like. Further, the case where the cover member 50 has the notch 53 has been described, but the cover member may not have a notch. Further, the light source module 25 may be a replaceable lamp, the sensor unit 85 may directly control the lighting of the lamp, and further, the sensor unit 85 may not be provided.

[0057] In addition, the case where the cover member 50 has a disc shape has been described, but the cover member may not have a plate shape as shown below. FIG. 11 is a perspective view of a lighting device with a cover 101 of a modified example when viewed from an obliquely upper side. As shown in FIG. 11, the cover member 150 may have a cap shape. The cover member 150 is made of a non-combustible material. The lighting device with a cover 101 includes a lighting device 110 and a cover member 150 fixed to the upper surface of the housing 115 of the lighting device 110 using a double-sided tape.

[0058] The lid member 150 has a top plate portion 151 that is substantially circular in plan view when viewed from the height direction, and a frustum portion 152 that extends downward in the height direction from the outer edge portion of the top plate portion 151 and has an increasing diameter toward the lower side. The lid member 150 has a plurality of notches 153 that are arranged at intervals in the circumferential direction. The notches 153 extend downward in the height direction from the outer edge portion of the top plate portion 151 to the lower end of the frustum portion 152 and open downward in the height direction. The top plate portion 151 constitutes a lid portion that covers at least a part of the upper surface of the housing 115. Further, the annular lower end surface of the frustum portion 152 serves as a ceiling hanging portion that does not overlap the housing 115 when viewed from the height direction.

[0059] Also in the lighting device 101 with a lid according to the modified example, when a fire occurs and the lighting device 110 melts and drops, the lid member 150 can block the hole provided in the ceiling. Therefore, when a fire occurs, the collapse of the building can be suppressed, and even when the building collapses, the time until collapse can be lengthened. In order to ensure that the ceiling hanging portion is securely hooked on the ceiling back during a fire, the lid member is preferably made of a material (a material that expands) that expands outward (outer peripheral side) by heating, and it is preferable that the area of the ceiling hanging portion expands by heating. In this case, the area of the ceiling hanging portion expands at 800°C. The area of the ceiling hanging portion preferably expands at 300°C or higher, and more preferably expands at 100°C or higher.

Description of Reference Numerals

[0060] 1,101 Covered lighting device, 2 Accommodation part, 6 Hole, 7 Ceiling, 8 Hole in the ceiling, 9 Bolt, 9a Shaft part, 10,110 Lighting device, 12 Boss part, 13 Threaded hole (cover fixing part), 14 Spring mounting part, 15,115 Housing, 18 Upper surface of the housing, 19 Bottom surface of the attic, 21 Substrate, 22 Light source, 25 Light source module, 27 Flange part, 28 Sealing member for the light source, 31 First side wall part, 35 Power supply accommodation recess, 36 Second side wall part, 37 Light source fixing part, 46 Locking recess, 50 Cover member, 51 Cover part, 52 Ceiling hanging part, 53,153 Notch, 54 Through hole (fixing part), 58 Central part, 70 Mounting spring, 71 Housing mounting part, 72 Wide part, 74 Bending part, 75 Light source unit, 76 Locking part, 77 Substrate fixing part, 78 Engaging recess, 79 Locking claw, 81 Optical member, 82 Emitting surface, 85 Power supply device, 90 Frame material, 91 Recess in the frame body, 95 Sealing member, 151 Top plate part, 152 Frustum part.

Claims

1. A lighting device having a housing portion housed in a hole provided in a ceiling and fixed around the hole, comprising: a housing made of a material having a melting point lower than that of iron; a light source disposed in the housing and emitting light downward in the height direction; a lid member fixed to the housing and including a lid portion covering at least a part of the upper surface of the housing; the lid member is made of a non-combustible material; the lid member includes a ceiling hanging portion that does not overlap the housing when viewed from the height direction, the lighting device with a lid.

2. A lighting device having a housing portion housed in a hole provided in a ceiling and fixed around the hole, comprising: a housing made of a material having a melting point lower than that of iron; a light source disposed in the housing and emitting light downward in the height direction; a lid member fixed to the housing and including a lid portion covering at least a part of the upper surface of the housing; the lid member is made of a non-combustible material; the lid member includes a ceiling hanging portion that at least partially overlaps the ceiling when viewed from the vertical direction, the lighting device with a lid.

3. The lighting device with a lid according to claim 1 or 2, wherein the non-combustible material is a material that can be deformed when passing through the hole and can return to its original shape after passing through the hole.

4. The lighting device with a lid according to claim 1 or 2, wherein the non-combustible material is a heat insulating material.

5. The lid portion is fixed to the housing and has two or more fixing portions spaced apart from each other; a plurality of mounting springs attached to the spring mounting portion of the housing; the lid member has a flat plate shape; the lid member has a plurality of notches arranged at intervals in the circumferential direction and having an open outer peripheral side; when viewed from the height direction, at least a part of each mounting spring overlaps the notch, the lighting device with a lid according to claim 1 or 2.

6. A lighting device having a housing portion housed in a hole provided in a ceiling and fixed around the hole, comprising: a housing made of a material having a melting point lower than that of iron; a light source disposed in the housing and emitting light downward in the height direction; one or more lid fixing portions are provided on the housing; a lid member including a lid portion covering at least a part of the upper surface of the housing can be attached to the housing using the lid fixing portion, the lighting device.

7. The lid member fixed to the lighting device according to claim 6, comprising: the lid portion; a fixing portion fixed to the housing using the lid fixing portion; A ceiling hanging portion that does not overlap the housing when viewed from the height direction in a state of being fixed to the lighting device, A lid member comprising: **Claim 8** The lighting device includes a plurality of mounting springs attached to the spring mounting portion of the housing, The housing is provided with a plurality of the lid fixing portions arranged at intervals from each other, It has a flat plate shape, has a plurality of notches arranged at intervals in the circumferential direction and having an open outer peripheral side, The lid member according to claim 7, wherein at least a part of each of the mounting springs overlaps the notch when viewed from the height direction in a state of being attached to the lighting device. **Claim 9** A lighting device with a lid according to claim 1 or 2, The ceiling having the hole, and comprising: A ceiling structure in which at least a part of the ceiling hanging portion overlaps the back of the ceiling when viewed from the vertical direction. **Claim 10** The ceiling structure according to claim 9, wherein all of the holes overlap the lid member when viewed from the vertical direction.

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