Luminaire

Abstract

To provide a ceiling embedded type luminaire that can secure flame shielding performance of a ceiling when a fire occurs.SOLUTION: A luminaire 10 is a ceiling embedded type luminaire to be attached to a rectangular opening 101 provided in a ceiling plate 100, and comprises an appliance body 11, and a flame shielding plate 20 attached to an upper part of the appliance body 11. The flame shielding plate 20 has a shape capable of passing through the opening 101, is arranged so as to overlap with an edge part 102 around the opening 101 of the ceiling plate 100 in a vertical direction when the luminaire 10 is attached to the opening 101, and closes the opening 101 by getting caught on the edge part 102 when a fire occurs.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a lighting fixture, and particularly to a recessed ceiling lighting fixture.

Background Art

[0002] Conventionally, in a recessed ceiling lighting fixture, in order to ensure the flame shielding performance at the ceiling hole during a fire, it has been desired to suppress the melting of the fixture at the time of fire occurrence. For this reason, recessed ceiling lighting fixtures are generally made of steel plates. For example, Patent Document 1 discloses a recessed ceiling lighting fixture in which the main body (housing) is made of a steel plate in order to prevent melting during a fire.

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 semi - fire - resistant structure aimed at maintaining the shape of the building for a predetermined time is defined. Since the semi - fire - resistant structure is defined for the main structural parts from the viewpoint 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. By the way, square lighting fixtures attached to rectangular ceiling holes are also widely spread, but the square shape is difficult to manufacture using a steel plate, and is often manufactured using a material with a lower melting point than a steel plate such as an aluminum material. For this reason, the lighting fixture melts at the time of fire occurrence, and the flame shielding performance of the ceiling surface cannot be ensured. Therefore, there is a possibility that the fire spreads from the ceiling to the floor space of the upper floor through the hole, and the standard of the semi - fire - resistant structure of the floor surface may not be satisfied.

[0005] The object of the present disclosure is to provide a lighting device or the like that can more easily satisfy the requirements of the semi-fire-resistant structure regulations for the parts subject to the semi-fire-resistant structure regulations even when the housing of the lighting device melts in the event of a fire.

Means for Solving the Problems

[0006] A lighting fixture according to an aspect of the present disclosure is a ceiling-embedded lighting fixture attached to a rectangular opening provided in a ceiling board, and includes a fixture body and a flame shield attached to the upper part of the fixture body. The flame shield has a shape that can pass through the opening, and is arranged so as to overlap vertically with the edge around the opening of the ceiling board in a state where the lighting fixture is attached to the opening, and is characterized in that it catches on the edge during a fire and closes the opening.

Effects of the Invention

[0007] According to an aspect of the present disclosure, in a ceiling-embedded square lighting fixture, the flame shielding performance of the ceiling during a fire can be ensured. Furthermore, it is possible to suppress the collapse of the installed building, or even if the building collapses, it is possible to extend the time until collapse.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0009] Hereinafter, with reference to the drawings, an example of an embodiment of a lighting fixture according to the present disclosure will be described in detail. Note that a form formed by selectively combining the components of a plurality of embodiments and modification examples described below is included in the scope of the present disclosure. In the description of the embodiment, for convenience of explanation, the direction perpendicular to the ceiling board is defined as the vertical direction, and in a state where the lighting fixture is attached to the ceiling board, the direction in which the lighting fixture is embedded with respect to the ceiling board is defined as upward, and the opposite side is defined as downward. In addition, the appearance when viewed from directly above is defined as a plan view, and a view seen from directly above is defined as a plan view drawing.

[0010] FIG. 1 is a perspective view of a lighting fixture 10 which is an example of an embodiment as viewed from above. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 3 is a plan view of the lighting fixture 10.

[0011] As shown in FIGS. 1 to 3, the lighting fixture 10 is a ceiling-embedded lighting fixture attached to a rectangular opening 101 provided in a ceiling board 100, and includes an appliance body 11 and a flame shield 20 attached to the upper part of the appliance body 11. The flame shield 20 has a shape that can pass through the opening 101, and in a state where the lighting fixture 10 is attached to the opening 101, it is arranged so as to overlap vertically with the edge 102 around the opening 101 of the ceiling board 100. The flame shield 20 blocks the opening 101 by getting caught on the edge 102 of the opening 101 even when the appliance body 11 melts during a fire.

[0012] The edge 102 around the opening 101 is a belt-shaped region having a certain width that surrounds the opening 101 while being in contact with the opening 101. In other words, the edge 102 is a rectangular frame-shaped region that surrounds the opening 101 along the edge 103 of the opening 101 in a plan view. When the appliance body 11 melts during a fire, the flame shield 20 gets caught on the edge 102 on the upper surface of the ceiling board 100. Note that the contour line of the opening 101 in the plan view of the ceiling board 100 is defined as the edge 103, distinguishing it from the edge 102 having a certain width. The width of the edge 102 is defined, for example, as 1 mm or more and 10 mm or less.

[0013] The lighting fixture 10 is a rectangular fixture inserted into a rectangular opening 101, and at least a part of the fixture body 11 is formed in a rectangular shape in plan view. It is difficult to manufacture the fixture body 11 having a rectangular shape in plan view using steel (iron), and for example, it is made of a material with a lower melting point than iron such as aluminum. On the other hand, since the flame shield 20 is required to have a flame shielding function, the flame shield 20 is made of a material that does not melt during a fire, such as steel.

[0014] In order to enhance the fire resistance performance of a building in which a ceiling-embedded lighting fixture is installed, it is necessary to ensure the flame shielding performance of the ceiling such that when a fire occurs, not all of the lighting fixtures melt, and at least a part of them covers the opening of the ceiling board without melting. However, in the case of a rectangular lighting fixture, as described above, it is usually made of a material with a low melting point such as aluminum, and thus it melts during a fire and cannot block the opening. According to the lighting fixture 10, even if the fixture body 11 melts during a fire, the flame shield 20 attached to the fixture body 11 does not melt and is caught by the ceiling board 100 so as to cover the opening 101, making it possible to ensure the flame shielding performance of the ceiling.

[0015] In the lighting fixture 10, when any three points are selected from the range where the edge 103 of the opening 101 and the flame shield 20 overlap in plan view with the lighting fixture 10 attached to the opening 101, the flame shield 20 is attached such that there is at least one or more triangles surrounding the center of gravity of the flame shield 20.

[0016] Although it will be described in detail later, it is preferable that the flame shield 20 is attached so as to overlap with the edge 102 in the vertical direction in at least two opposite regions out of the four regions of the edge 102 corresponding to the four sides forming the opening 101 (edge portion 102). In the present embodiment, the flame shield 20 is attached so as to overlap with the edge 102 in the vertical direction in all of the four regions of the edge 102 corresponding to the four sides forming the opening 101.

[0017] The lighting fixture 10 further includes a mounting spring 16 for attaching the fixture to the opening 101. The mounting spring 16 is attached to the fixture body 11 via a mounting spring locking portion 17 on the outer side surface of the fixture body 11. The mounting spring 16 is a leaf spring, and three such springs are provided in this embodiment. The lighting fixture 10 is inserted into the opening 101 from below with the mounting spring 16 bent upward. Then, since the mounting spring 16 has a force to deform downward, the ceiling board 100 is sandwiched between the main body outer frame 14 and the mounting spring 16 described later, and the lighting fixture 10 can be held in the opening 101. The flame shield 20 is provided with a notch 21 for suppressing interference between the flame shield 20 and the mounting spring 16 when the mounting spring 16 is bent upward.

[0018] The lighting fixture 10 further includes a fixture mounting frame 15 disposed on the main body outer frame 14. In this case, the main body outer frame 14 presses the fixture mounting frame 15 against the ceiling board 100, making it possible to enhance the sealing performance. This can reduce the entry of dust from the ceiling space into the room. Furthermore, enhancing the sealing performance also works advantageously in terms of sound insulation and temperature management. Also, the lighting fixture 10 includes a terminal block (not shown) disposed on the flame shield 20 for receiving commercial power from an external power source.

[0019] Hereinafter, each element of the lighting fixture 10 will be described in detail.

[0020] [Fixture Body] The fixture body 11 includes a light source housing portion 12, a reflector housing portion 13, and a main body outer frame 14, and is formed in a cylindrical shape with both upper and lower ends open. In this embodiment, a flame shield 20 is attached so as to close the upper opening of the fixture body 11. The light source housing portion 12 is formed in a substantially cylindrical shape, and the flame shield 20 is fixed to the upper portion thereof. The reflector housing portion 13 is located at the lower portion of the fixture body 11 and forms the cylindrical wall of the fixture body 11 together with the light source housing portion 12. The reflector housing portion 13 is a portion located within the opening 101 when the lighting fixture 10 is attached to the ceiling board 100, and is formed in a substantially rectangular shape in plan view. The main body outer frame 14 projects in a flange shape from the lower end portion of the reflector housing portion 13 and is formed in a square frame shape. The main body outer frame 14 is disposed around the opening 101 on the lower surface of the ceiling board 100.

[0021] The fixture body 11 is made of a material having a lower melting point than the material constituting the flame shield 20. Generally, the fixture body 11 is formed of a material having a low melting point such as aluminum. In order to ensure fire resistance, it is preferable to form it with a steel plate having a high melting point and being difficult to melt even when a fire occurs. However, in the case of a square fixture, it is often formed of aluminum or the like from the viewpoint of workability. The fixture body 11 is composed of, for example, an aluminum alloy, and the light source housing portion 12, the reflector housing portion 13, and the main body outer frame 14 are integrally formed by aluminum die casting.

[0022] Inside the light source housing portion 12, a light source 30 and a holder 19 are disposed. The light source 30 is connected to the holder 19 by base pins. The light source 30 is installed at a position recessed upward from the lower end portion of the fixture body 11 in order to appropriately suppress glare when viewed from below.

[0023] Inside the reflector housing portion 13, a reflector 33 is disposed. In this embodiment, the inner peripheral surface of the fixture body 11 functions as the reflector 33. The reflector 33 is formed by applying a white coating agent having high reflection characteristics. Alternatively, a reflector 33 using an aluminum material may be used. Further, the reflector 33 has a larger diameter at the lower portion than at the upper portion so that the light emitted from the light source 30 spreads more downward.

[0024] [Light source, holder] The light source 30 is electrically connected to and physically held by the holder 19 via the base pins provided on the light source 30. Commercial power input from the terminal block 18 is supplied to the holder 19 and further applied to the light source 30 via the base pins. The light source 30 includes a light-transmitting cover 31 and an LED module 32. Further, a control device is disposed inside the light source 30. The control device converts the commercial power applied from the base pins into a direct current for lighting the LED module 32. Note that, different from this embodiment, it may be a form in which the direct current for LED lighting converted by an external control device is input to the LED module built into the appliance main body.

[0025] The holder 19 is directly attached to the flame shield 20 using screws 22. Note that, the appliance main body 11 may have a bottom plate portion on the side opposite to the opening 101, and the holder 19 may be attached to the bottom plate portion. In this case, the flame shield 20 is attached to the bottom plate portion. At this time, the bottom plate portion of the appliance main body 11, the holder 19, and the flame shield 20 may all be screwed together so as to penetrate each other, or the bottom plate portion and the holder 19, and further, the holder 19 and the flame shield 20 may be screwed together separately.

[0026] [Flame shield] The flame shield 20 has a shape that can pass through the opening 101 and is locked to the upper end of the light source housing portion 12 of the appliance main body 11 using screws 22. The flame shield 20 is made of a material having a higher melting point than the appliance main body 11 or a material having no melting point so as not to melt even in the event of a fire, and is preferably made of a steel material. The flame shield 20 has a substantially rectangular shape, and the four sides of the flame shield 20 are not parallel to the four sides around the main body outer frame 14 of the appliance main body 11, respectively. The flame shield 20 is arranged such that when the appliance main body 11 is attached to the opening 101, the flame shield 20 and the edge portion 102 overlap in the vertical direction. The lighting fixture 10 is inserted into the opening 101 with the four sides of the flame shield 20 parallel to the respective sides adjacent to the edge portion 102, and the four sides of the flame shield 20 are non-parallel to the respective sides of the edge portion 102 in the state of being attached to the ceiling plate 100.

[0027] Since the flame shield 20 is arranged so as to overlap with the edge portion 102, that is, so as to have a catching portion, even when a fire occurs and the appliance body 11 melts, it catches on the edge portion 102 and stays at the opening 101 without falling. That is, it covers the opening 101 and exhibits a flame shielding performance, making it possible to suppress the spread of fire to the ceiling space or other floors.

[0028] The procedure for attaching the lighting fixture 10 having the flame shield 20 to the opening 101 is as follows. First, hold the flame shield 20 in an appropriate direction so that it can pass through the opening 101, push it upward, and insert the flame shield 20 through the opening 101. At this time, the mounting spring 16 needs to be bent upward in advance so as not to interfere with the attachment. When the flame shield 20 passes through the opening 101, next, rotate the outer body frame 14 of the appliance body 11 so that it is in an appropriate direction with respect to the opening 101, that is, so that each side around the outer body frame 14 is parallel to the four sides forming the opening 101.

[0029] While holding the outer body frame 14 in an appropriate direction with respect to the opening 101, push the lighting fixture 10 upward. At this time, since the mounting spring 16 has a force to deform downward, the ceiling board 100 is sandwiched between the outer body frame 14 and the mounting spring 16, making it possible to hold the lighting fixture 10 in the opening 101.

[0030] The flame shield 20 has a notch 21. As described above, when attaching the lighting fixture 10 to the opening 101, it is necessary to bend the mounting spring 16 upward. However, if there is no notch 21, the flame shield 20 and the mounting spring 16 will interfere with each other, making smooth attachment difficult. When there is a notch 21, when the mounting spring 16 is bent upward, the spring can be stored in that location, so interference between the flame shield 20 and the mounting spring 16 can be suppressed.

[0031] When the flame shield 20 does not have the notch 21, in order for the flame shield 20 to pass through the opening 101, the flame shield 20 needs to be in a smaller shape. Then, when the lighting fixture 10 is attached to the opening 101, the overlapping area between the flame shield 20 and the edge 102 becomes smaller. That is, it is assumed that the way of being caught by the opening 101 becomes unstable.

[0032] Since the flame shield 20 has the notch 21, it is possible to maintain a wide overlapping area with the edge 102 while ensuring smooth workability. That is, even when a fire occurs and the appliance body 11 melts, it is possible to achieve a higher flame shielding performance without falling from the opening 101. The number of notches 21 may be less than the number of mounting springs 16, but in this embodiment, it is the same number (three) as the mounting springs 16.

[0033] In this embodiment, out of the three notches 21, two are provided on one side around the flame shield 20. The other one is provided by notching the corner of the flame shield 20. That is, one notch 21 is formed across two sides around the flame shield 20. The position of the notch 21 is appropriately determined by the relative angle between the two when the flame shield 20 is attached to the appliance body 11, the position where the mounting spring 16 is attached to the appliance body 11, etc., and it is only necessary to be provided so as to suppress interference between the mounting spring 16 and the flame shield 20 when the mounting spring 16 is bent upward.

[0034] In a plan view of the lighting fixture 10, when any three points are selected from the range overlapping the edge 103 of the opening 101, there is at least one or more triangles that surround the center of gravity of the flame shield 20. In other words, the flame shield 20 is attached to the fixture body 11 such that such a triangle exists. In FIG. 3, the edge 103 of the opening 101 is indicated by a virtual line α. That is, in the portion where the virtual line α and the flame shield 20 overlap, at least one triangle formed by connecting any three points on the virtual line α surrounds the center of gravity of the flame shield 20. In this case, even when a fire occurs and the fixture body 11 melts, the flame shield 20 is held at the edge portion 102 so as to surround the center of gravity of the flame shield 20. That is, the flame shield 20 stays to cover the opening 101 without falling and exhibits a flame shielding performance, and it becomes possible to suppress the spread of fire to the ceiling or other floors.

[0035] The flame shield 20 is preferably arranged so as to overlap the edge portion 102 in the vertical direction in at least two opposite regions out of the four regions of the edge portion 102 corresponding to the four sides forming the edge portion 102. By adopting this configuration, even when the fixture body 11 melts during a fire, the flame shield 20 is caught and held at the edge portion 102 at positions facing each other with respect to the opening 101. Therefore, the flame shield 20 stays to cover the opening 101 without falling and exhibits a flame shielding performance, and it becomes possible to suppress the spread of fire to the ceiling or other floors.

[0036] In the present embodiment, the flame shield 20 is attached to the fixture body 11 so as to overlap the edge portion 102 in the vertical direction in all of the four regions of the edge portion 102 corresponding to the four sides forming the edge portion 102. By adopting this configuration, even when the fixture body 11 melts during a fire, the flame shield 20 is caught by the edge portion 102 on all four sides with respect to the opening 101, and thus is more reliably held. Therefore, the flame shield 20 stays to cover the opening 101 without falling and exhibits better flame shielding performance, and it becomes possible to more effectively suppress the spread of fire to the ceiling or other floors.

[0037] The flame shield 20 preferably overlaps in the vertical direction with at least 50%, preferably 60% or more of the opening area of the opening 101 in the plan view of the lighting fixture 10. An example of the suitable area of the flame shield 20 overlapping the opening 101 in the vertical direction is 60% or more and 95% or less, or 70% or more and 90% or less, or 80% or more and 90% or less of the opening area, from the viewpoints such as achieving both flame shielding performance and workability. For example, in the case where it is configured without providing the notch 21, it is possible to cover about 60% of the opening 101. Thereby, it becomes possible to suppress the spread of fire to the ceiling space or other floors.

[0038] Furthermore, in the case where it is configured with the notch 21 provided, since the size of the flame shield 20 can be made larger, for example, it is possible to cover about 80% of the opening 101. Thereby, it becomes possible to more effectively suppress the spread of fire to the ceiling space or other floors.

[0039] As described above, in the plan view of the lighting fixture 10, the four sides around the flame shield 20 are installed offset from the four sides forming the opening 101, so that the flame shield 20 is caught on the ceiling board 100. The corner portions of the flame shield 20 overlap with the edge portion 102 and are held so as to suppress falling with respect to the ceiling board 100. The area of the flame shield 20 overlapping with the edge portion 102 is preferably about 3% of the entire area of the flame shield 20. More preferably, it is 5% or more. In the plan view of the lighting fixture 10, the flame shield 20 is preferably arranged such that the length (the longest distance from the virtual line α) of each portion overlapping with the edge portion 102 is at least 1 mm. When the width of the edge portion 102 is defined as 1 mm or more and 10 mm or less, the flame shield 20 may have a portion overlapping the upper surface of the ceiling board 102 beyond the range of the edge portion 102.

[0040] When the appliance body 11 melts, the flame shield 20 will fall downward to cover the opening 101. However, it doesn't always fall straight down, and there may be some deviation when viewed from above. Even in this case, if the area where the flame shield 20 overlaps with the edge 102 is made wide in advance, it is possible to prevent the flame shield 20 from falling without getting caught on the opening 101, and more reliably suppress the spread of fire.

[0041] The modified example will be described with reference to FIGS. 4 and 5. FIG. 4 is a plan view of a lighting fixture 10x which is an example of the modified example, and FIG. 5 is a cross-sectional view taken along line BB in FIG. 4. The configuration of the lighting fixture 10x other than the flame shield 20x is the same as that of the lighting fixture 10.

[0042] The flame shield 20x is provided with a fall prevention stopper 23. For example, holes for attaching the fall prevention stopper 23 are pre-drilled in the flame shield 20x, and screw threads are formed between the flame shield 20x and the fall prevention stopper 23, and it can be attached by rotating the fall prevention stopper 23.

[0043] The flame shield 20x is attached to the appliance body 11 so as to overlap the edge 102 in the vertical direction on all four sides forming the opening 101. And the fall prevention stopper 23 is near each side of the opening 101 where the flame shield 20x and the edge 102 overlap, and is attached to the flame shield 20 at a position inside the edge 102 in plan view. Further, the fall prevention stopper 23 is attached so as to penetrate downward from the flame shield 20x. The fall prevention stopper 23 is disposed within the opening 101 in the plan view of the lighting fixture 10 and abuts against the edge 103 of the opening 101 to prevent the flame shield 20x from moving in the horizontal direction.

[0044] The fall prevention stopper 23 is preferably made of steel. In this case, the fall prevention stopper 23 does not melt during a fire. Since the fall prevention stopper 23 is attached to the flame shield 20x as described above, when a fire occurs and the appliance body 11 melts, it is possible to suppress the horizontal displacement of the flame shield 20x, and it becomes possible to more reliably exhibit the flame shielding performance.

[0045] More specifically, it is as follows. When the appliance body 11 melts, the flame shield 20x is caught by the edge 102 of the opening 101. At this time, the fall prevention stopper 23 is located near the side forming the opening 101 in the opening 101. Then, the flame shield 20x cannot move in the direction in which the fall prevention stopper 23 interferes with the edge 103 of the opening 101, and it becomes possible to regulate the displacement of the flame shield 20x.

[0046] One fall prevention stopper 23 may be provided, but it is more effective to attach it corresponding to each of the four sides forming the opening 101. If the fall prevention stopper 23 capable of abutting on each of the four sides (the edge 103 of the opening 101) is provided, it becomes possible to regulate the displacement of the flame shield 20 from four directions. Therefore, it is possible to more reliably prevent the flame shield 20x from falling during a fire and to more effectively exhibit the flame shielding performance.

[0047] Two or three fall prevention stoppers 23 may be provided. In this modification, the fall prevention stopper 23 is separate from the flame shield 20x, but it may be integrally formed with the flame shield 20x. Further, the screw 22 for attaching the flame shield 20x to the appliance body 11 may be configured to also serve as the fall prevention stopper 23.

[0048] In order to suppress the horizontal displacement of the flame shield 20x in the plan view of the lighting fixture 10, the region near where the flame shield 20x contacts the side of the opening 101 may have a stepped structure. Due to this step as well, similar to the above-described fall prevention stopper 23, it is possible to suppress the displacement of the flame shield 20x. The step may be provided only at a position corresponding to one of the four sides forming the opening 101, but providing it at more positions enables a higher flame shielding performance to be exhibited.

[0049] In addition to the step, for example, by providing a bending structure, it is also possible to suppress the displacement. Additionally, taking various structures or adding other members can be appropriately selected as design means.

[0050] As described above, according to the lighting fixtures 10, 10x, even if the fixture body 11 melts during a fire, the flame shields 20, 20x attached to the fixture body 11 are caught by the edge 102 of the opening 101 to close the opening 101, so that the flame shielding performance of the ceiling can be effectively ensured.

Explanation of Reference Numerals

[0051] 10 Lighting fixture 10x Lighting fixture 11 Fixture body 12 Light source housing part 13 Reflector housing part 14 Main body outer frame 15 Fixture mounting frame 16 Mounting spring 17 Mounting spring locking part 18 Terminal block 19 Holder 20 Flame shield 20x Flame shield 21 Notch 22 Screw 23 Fall prevention stopper 30 Light source 31 Translucent cover 32 LED module 33 Reflector 100 Ceiling board 101 Opening 102 Edge part 103 Edge

Claims

1. A ceiling-embedded lighting fixture to be attached to a rectangular opening provided in a ceiling board, comprising: a fixture body; a flame shield attached to the upper part of the fixture body; The flame shield has a shape that can pass through the opening, and is arranged so as to overlap vertically with the edge around the opening of the ceiling board in a state where the lighting fixture is attached to the opening, and is characterized in that it catches on the edge during a fire and closes the opening.

2. A ceiling-embedded lighting fixture to be attached to a rectangular opening provided in a ceiling board, comprising: a fixture body; a flame shield attached to the upper part of the fixture body; The flame shield has a shape that can pass through the opening, and is arranged so as to overlap vertically with the edge around the opening of the ceiling board in a state where the lighting fixture is attached to the opening, In the flame shield, when any three points are selected from the range overlapping with the edge of the opening in a plan view of the lighting fixture, there is at least one triangle that surrounds the center of gravity of the flame shield.

3. A ceiling-embedded lighting fixture to be attached to a rectangular opening provided in a ceiling board, comprising: a fixture body; a flame shield attached to the upper part of the fixture body; The flame shield has a shape that can pass through the opening, and is arranged so as to overlap vertically with the edge around the opening of the ceiling board in a state where the lighting fixture is attached to the opening, The flame shield is arranged so as to overlap vertically with the edge in at least two opposite sides among the four sides forming the edge in a state where the lighting fixture is attached to the opening.

4. In the lighting fixture according to Claim 3, the flame shield is arranged so as to overlap vertically with the edge in all sides of the four sides forming the edge in a state where the lighting fixture is attached to the opening.

5. In the lighting fixture according to any one of Claims 1 to 4, it is provided with a mounting spring for attaching the lighting fixture to the opening, The flame shield is provided with a notch for suppressing interference between the flame shield and the mounting spring when the mounting spring is bent upward.

6. In the lighting fixture according to any one of Claims 1 to 4, ​ ​ ​ The flame shield is disposed within the opening in a plan view of the lighting fixture, and has a fall prevention stopper that abuts against an edge of the opening to prevent rotation of the flame shield.

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