Lighting fixtures

Abstract

To provide a luminaire whose structure is easily made simple, and that efficiently and easily dissipates heat generated by a light source module.SOLUTION: At least a portion of a luminaire 1 is arranged inside a hole provided in a building. The luminaire 1 comprises: a board 61 in which a light emitting part 62 is mounted on a first surface 61a, and an electronic component is mounted on a second surface 61b on the side opposite to the first surface 61a; and a top plate 80 arranged so as to cover the second surface 61b in the height direction. The electronic component is mounted on a part at an interval from a back side portion 61c in the second surface 61b on the back side of the light emitting part 62. The back side portion 61c is in contact with the top plate 80.SELECTED DRAWING: Figure 27

Description

Technical Field

[0001] The present disclosure relates to a lighting fixture.

Background Art

[0002] Conventionally, as a lighting fixture, there is a downlight described in Patent Document 1. This downlight includes a light source module, a radiator, a power supply device, a reflector, and a decorative frame, and the light source module is installed in the radiator. This downlight assembles the power supply device from the side of the radiator, while assembling the reflector and the decorative frame from the light-emitting side of the light source module. This downlight assembles a plurality of components from different directions and integrates them together using a large number of screws.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the above lighting fixture dissipates the heat generated by the light source module by accommodating the light source module in the radiator, the structure of the lighting fixture is likely to become complicated and the lighting fixture is likely to become large-sized. Therefore, an object of the present disclosure is to provide a lighting fixture that is easy to have a simple structure and is easy to efficiently dissipate the heat generated by the light-emitting part.

Means for Solving the Problems

[0005] To solve the above problems, the lighting fixture according to this disclosure is a lighting fixture in which at least a part is placed inside a hole provided in a building, and comprises a substrate on which a light-emitting part is mounted on a first surface and electronic components are mounted on a second surface opposite to the first surface, and a top plate arranged to cover the second surface in the height direction, wherein the electronic components are mounted at spaced intervals on the back side of the light-emitting part on the second surface, and the back side is in contact with the top plate. [Effects of the Invention]

[0006] According to this disclosure, it is possible to realize a lighting fixture that is easy to make simple in structure and that can efficiently dissipate the heat emitted by the light-emitting part. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view of a lighting fixture according to one embodiment of the present disclosure. [Figure 2] This is an exploded perspective view of a lighting fixture. [Figure 3A] This is a perspective view of the frame from the second oblique side (opposite the light emission side). [Figure 3B] This is a perspective view of the frame from the first oblique side (light emission side). [Figure 4A] This is a perspective view of the cover from a second, oblique angle. [Figure 4B] This is a side view of the cover as seen from the radially outward (side) side. [Figure 5] This is a perspective view illustrating the positioning of the cover relative to the frame. [Figure 6A] This is a perspective view of the reflector from the second oblique side. [Figure 6B] This is a perspective view of the reflector from the first oblique side. [Figure 7] This is a perspective view showing the reflector fitted into the cover. [Figure 8] This is a perspective view of the base member from a second oblique angle. [Figure 9] This is a perspective view illustrating the assembly of the base member to the reflector. [Figure 10] It is a perspective view for explaining the assembly of the light source module to the reflector. [Figure 11A] It is a perspective view when the light source module is viewed from the first side obliquely. [Figure 11B] It is a perspective view when the light source module is viewed from the second side obliquely. [Figure 12] It is a perspective view for explaining the locking structure of the light source module to the reflector. [Figure 13] It is a perspective view for explaining the bending of a pair of first locking pieces and a pair of second locking pieces in the base member. [Figure 14] It is a perspective view for explaining the restraint of the substrate using a pair of first locking pieces and a pair of second locking pieces. [Figure 15] In a lighting fixture, it is a plan view when the cover, the reflector, and the substrate are viewed from the first side in the height direction. [Figure 16A] It is a perspective view when the terminal block is viewed from the connection side to the power supply device and obliquely from the second side. [Figure 16B] It is a perspective view when the terminal block is viewed from the side opposite to the connection side to the power supply device and obliquely from the second side. [Figure 16C] It is a perspective view when the terminal block is viewed from the side opposite to the connection side to the power supply device and obliquely from the first side. [Figure 17] It is a perspective view of the terminal block cover. [Figure 18] It is a perspective view for explaining the attachment of the terminal block cover to the terminal block. [Figure 19] It is a perspective view for explaining the positioning of the terminal block with respect to the base member. [Figure 20] It is a perspective view for explaining the insertion of a pair of blade-shaped terminals of the terminal block into a pair of blade receivers of the power supply device. [Figure 21A] It is a perspective view when the top plate is viewed from the first side obliquely. [Figure 21B] It is a perspective view when the top plate is viewed from the second side obliquely. [Figure 22]This is a cross-sectional view of the area around the terminal block of a lighting fixture, including the height direction and the insertion direction of the terminal block. [Figure 23] This is a perspective view illustrating the locking structure of the top plate to the base member. [Figure 24] This is a perspective view illustrating the fastening of the top plate, mounting springs, base members, and frame using male screws. [Figure 25] This is a cross-sectional view illustrating the fastening of the top plate, mounting springs, base members, and frame body by male screws. [Figure 26] This is a cross-sectional view of the second side of the integrated lighting fixture. [Figure 27] Figure 26 is an enlarged cross-sectional view of the area around the reflector. [Figure 28] This is a magnified cross-sectional view of the flange area of ​​the cover of a luminaire that is integrated into a single unit. [Modes for carrying out the invention]

[0008] The embodiments relating to this disclosure will be described in detail below with reference to the attached drawings. It should be noted that if multiple embodiments or modifications are included below, it is anticipated from the outset that new embodiments may be constructed by appropriately combining their characteristic features.

[0009] Furthermore, the following description will focus on the case where the light-emitting part includes an LED (Light Emitting Diode). However, the light-emitting part may include an SMD (Surface Mount Device) type LED chip, or a COB (Chip On Board) type LED chip. Alternatively, the light-emitting part may include a bullet-shaped LED, or a FLUX type LED. Alternatively, the light-emitting part may include a semiconductor light-emitting element other than an LED. Alternatively, the light-emitting part may include a solid-state light-emitting element such as an organic EL (Electro Luminescence) element or an inorganic EL element.

[0010] Furthermore, the lighting fixture of this disclosure may be fixed to a ceiling or the like with the central axis of the inner surface of the frame parallel to the vertical direction. Alternatively, the lighting fixture of this disclosure may be a universal type lighting fixture whose direction can be adjusted, and may be fixed to a ceiling or the like with the central axis of the inner surface of the frame inclined with respect to the vertical direction.

[0011] Furthermore, in the following embodiments, the light-emitting side in the height direction of the lighting fixture (corresponding to the height direction of the frame) is referred to as the first side, and the side opposite to the light-emitting side in the height direction of the lighting fixture is referred to as the second side. Also, in the following embodiments, the same reference numerals are used for the same components in the drawings, and redundant explanations are omitted. In addition, multiple drawings include schematic diagrams, and the dimensional ratios such as length, width, and height of each component do not necessarily match between different drawings.

[0012] Furthermore, in the following embodiments, unless otherwise specified, the longitudinal direction refers to the longitudinal direction of the substrate 61 having a substantially rectangular plate shape, and the width direction refers to the width direction of the substrate 61 unless otherwise specified. The longitudinal direction and the width direction are orthogonal to each other. Also, the height direction refers to the height direction of the lighting fixture 1, and the orthogonal direction refers to the direction orthogonal to the height direction. The height direction coincides with the height direction of the frame 10, and in this embodiment, it also coincides with the thickness direction of the substrate 61.

[0013] Furthermore, among the components described below, those components that are not described in the independent claim representing the highest-level concept are optional components and not essential components.

[0014] Figure 1 is a perspective view of a lighting fixture 1 according to one embodiment of the present disclosure. As shown in Figure 1, the lighting fixture 1 is a downlight and comprises a plurality of mounting springs 5, a frame 10, a base member 50, and a top plate 80. The base member 50 covers a portion of the first surface on the first side of a substrate 61 (see Figure 2). Light emitted from a light-emitting unit 62 (see Figure 12A), which is mounted on another portion of the first surface of the substrate 61, is emitted to the first side through the opening on the first side of the frame 10.

[0015] The frame 10, base member 50, mounting spring 5, and top plate 80 are stacked in this order from the first side to the second side and are fixed to each other and integrated as a single unit by a plurality of male screws 7, which are an example of fixing members. The number of mounting springs 5 ​​and the number of male screws 7 are the same. In this embodiment, the lighting fixture 1 has two mounting springs 5 ​​and two male screws 7.

[0016] Multiple mounting springs 5 ​​are installed at intervals in the circumferential direction, and in this embodiment, two mounting springs 5 ​​are installed at equal intervals in the circumferential direction. The mounting springs 5 ​​are made of steel plates such as stainless steel and are members that fix the lighting fixture 1 to the ceiling surface. The mounting springs 5 ​​have a bent portion 5b and have a leaf spring structure. The mounting springs 5 ​​are distorted so that the base portion 5a of the mounting springs 5 ​​extends in the height direction of the embedded hole (not shown) along the periphery of the embedded hole provided in the ceiling, and at least a part of the mounting springs 5 ​​presses the inner circumferential surface of the embedded hole radially outward. In this way, the lighting fixture 1 to which the mounting springs 5 ​​are attached is fixed around the embedded hole with at least a part of it located inside the embedded hole.

[0017] The mounting hole is, for example, a cylindrical hole provided in the ceiling and extending vertically. The lighting fixture 1 is fixed around the mounting hole by, for example, pressing the mounting spring 5 radially inward so that the tip of the mounting spring 5 is located on the second side in the height direction, and pushing the lighting fixture 1 into the mounting hole from the ceiling plate 80 side (room side). When installing the lighting fixture 1 on a sloped ceiling that is inclined with respect to the horizontal plane, the mounting spring 5 is installed so that it extends in the axial direction of the mounting hole provided in the sloped ceiling.

[0018] The recessed opening in which at least a portion of the lighting fixture is placed is, for example, a cylindrical through-hole in the ceiling, but it may also be a through-hole in the ceiling of a shape other than cylindrical. Furthermore, the recessed opening in which at least a portion of the lighting fixture is placed may also be a bottomed hole in the ceiling. In addition, the recessed opening in which at least a portion of the lighting fixture is placed only needs to be provided in the building, and may be provided in a wall or other part other than the ceiling.

[0019] Figure 2 is an exploded perspective view of the lighting fixture 1. As shown in Figure 2, the lighting fixture 1 comprises a frame 10, a packing 20, a cover 30, a reflector 40, a base member 50, a mounting spring 5, a light source module 60, a terminal block 70, and a top plate 80. The lighting fixture 1 is stacked in the following order from the first side in the height direction to the second side: frame 10, packing 20, cover 30, reflector 40, base member 50, mounting spring 5, light source module 60 and terminal block 70, and top plate 80. These components are then integrated together using multiple locking structures and multiple male screws 7, which will be described in detail below. In this embodiment, the lighting fixture 1 does not have any male screws other than the male screws 7 that fix and integrate the frame 10, base member 50, mounting spring 5, and top plate 80 with each other.

[0020] The configuration of each component (part) and the integrated structure of multiple components (parts) will be described in detail below. Figure 3A is a perspective view of the frame 10 when viewed from a second oblique side, and Figure 3B is a perspective view of the frame 10 when viewed from a first oblique side. As shown in Figures 2, 3A, and 3B, the frame 10 is a single integrated component made of metal or resin, and includes a cylindrical part 11, a frustoconical part 12, a flange 13, and multiple plate-like parts 14. The frame 10 may be made of, for example, steel plate, may be made by die casting, or may be made by injection molding using resin material.

[0021] The cylindrical portion 11 is positioned on the second side, defining a substantially circular opening on the second side, and has a cylindrical inner circumferential surface 11a. The frustoconical portion 12 is connected to the first side end of the cylindrical portion 11 and has a tapered outer circumferential surface 12a and a tapered inner circumferential surface 12b that widen towards the first side. The tapered outer circumferential surface 12a is, for example, composed of a conical outer circumferential surface, and the tapered inner circumferential surface 12b is, for example, composed of a conical inner circumferential surface. The frustoconical portion 12 includes a portion exposed to the living room side. The tapered inner circumferential surface 12b also serves to control light distribution and defines a substantially circular opening on the first side.

[0022] Multiple plate-like portions 14 are provided at circumferential intervals at the second end of the frame 10. In this embodiment, two plate-like portions 14 are arranged at the same circumferential interval at the second end of the frame 10. The plate-like portions 14 have a plate shape, extend outward in a substantially orthogonal direction, and extend radially outward from the frame 10. Each plate-like portion 14 is provided with a through hole 14a that penetrates through in the height direction in its center, and the through hole 14a is a screw hole. The flange 13 has an annular shape and extends radially outward from the first end of the frustoconical portion 12.

[0023] As shown in Figure 2, a packing 20 is placed on the flange 13 of the frame 10 from the second side. The packing 20 is placed on the end face of the flange 13 on the second side. The packing 20 is an annular member and is made of an elastic material such as rubber. The packing 20 is sandwiched between the flange 13 and the ceiling surface, ensuring airtightness between the flange 13 and the ceiling surface. As shown in Figure 2, the packing 20 has a plurality of plate-shaped ribs 21 that are spaced apart in the circumferential direction and extend in the radial direction. The radially outward ends of the ribs 21 contact the inner circumferential surface of the embedding hole, and as a result, the central axis of the frame 10 is prevented from shifting from the center of the embedding hole.

[0024] As shown in Figure 2, the packing 20 has a plurality of notches 22 located at intervals in the circumferential direction, and in this embodiment, there are two notches 22 located at the same interval in the circumferential direction. The number of notches 22 corresponds to the number of plate-like portions 14. The shortest distance between the notches 22 is greater than the width of the mounting spring 5. As shown in Figure 2, the packing 20 is positioned on the flange 13 such that the circumferential positions of the plurality of notches 22 coincide with the circumferential positions of the plurality of plate-like portions 14.

[0025] In this embodiment, the case where the flange 13 has an annular shape when viewed from above in the height direction has been described. Furthermore, the case where the frustoconical portion 12 is located on the second side of the flange 13 in the frame 10, and a packing 20 having a circular outer edge when viewed from above in the height direction is placed on the end face of the second side of the flange 13, has been described. However, the flange may have a rectangular, frame-shaped annular shape when viewed from above in the height direction. And the frustoconical portion may be located on the second side of the flange in the frame, and a packing having a rectangular outer edge when viewed from above in the height direction is placed on the end face of the second side of the flange,

[0026] As shown in Figure 2, the cover 30 is placed on top of the frame 10 from the second side. Figure 4A is a perspective view of the cover 30 when viewed from the second oblique side, and Figure 4B is a side view of the cover 30 when viewed from the radially outward side (side). As shown in Figures 4A and 4B, the cover 30 has a main body 31 and a flange 32 which is connected to the second end of the main body 31 and is an example of a buffer portion.

[0027] The main body 31 is made of a light-transmitting and light-diffusing resin, such as acrylic or polycarbonate, and has a portion exposed to the living room side to protect the light-emitting part 62. The main body 31 has a cylindrical shape with the first side surface closed. As shown in Figure 4B, the sealing part 34 that seals the opening on the first side of the cylindrical part 33 of the main body 31 has a dome shape that is convex to the first side, and the radial center is located closest to the first side. The main body of the cover may also have a Fresnel lens shape used in light-gathering types, in which case the main body is made of a transparent material.

[0028] The main body 31 has an outer diameter slightly smaller than the inner diameter of the cylindrical portion 11 of the frame 10. As shown in Figure 5, the main body 31 is fitted and installed inside the cylindrical portion 11 of the frame 10. The flange 32 has an outer diameter larger than the outer diameter of the cylindrical portion 11 of the frame 10. The flange 32 is placed on the second annular end of the cylindrical portion 11 when the main body 31 is fitted inside the cylindrical portion 11. The flange 32 is made of an elastic and compressible elastic material, such as an elastomer or a rubber material such as silicone, and acts as a packing, providing tolerances for insect intrusion and for components such as the reflector 40.

[0029] In this embodiment, the main body 31 and the flange 32 are integrally formed by two-color molding. By integrally forming them by two-color molding, the step of attaching the main body 31 and the flange 32 with adhesive or the like can be omitted. Of course, the main body 31 and the flange 32 may be formed as separate parts, and the flange 32 may then be attached to the main body 31 with adhesive or the like.

[0030] As shown in Figures 2 and 4A, the flange 32 has a plurality of notches 35 that open radially outward. The plurality of notches 35 are spaced apart in the circumferential direction, and in this embodiment, two notches 35 are spaced equally apart in the circumferential direction. The number of notches 35 corresponds to the number of plate-like portions 14. As shown in Figure 5, the plurality of plate-like portions 14 are fitted into the plurality of notches 35, and this fitting positions the cover 30 circumferentially relative to the frame 10.

[0031] As shown in Figure 2, the reflector 40 is placed on top of the cover 30 from the second side. The reflector 40 is made of an opaque resin material or a steel plate. Figure 6A is a perspective view of the reflector 40 when viewed from the second oblique side, and Figure 6B is a perspective view of the reflector 40 when viewed from the first oblique side. As shown in Figures 2, 6A, and 6B, the reflector 40 has a cone-shaped (frustoconical) body 41 and a plurality of ribs 42.

[0032] The main body 41 has a tapered outer surface (e.g., a conical outer surface) 43 that widens towards the first side, and a tapered inner surface (e.g., a conical inner surface) 45 that widens towards the first side. The tapered inner surface 45 is a reflective surface that reflects light from the light-emitting part 62, and is, for example, smoothly mirror-finished. The tapered inner surface 45 efficiently reflects light from the light-emitting part 62 towards the living room, controlling the light distribution from the light-emitting part 62.

[0033] Multiple ribs 42 are positioned at intervals in the circumferential direction, and in this embodiment, two ribs 42 are positioned at the same interval in the circumferential direction. Each rib 42 has a protruding structure and projects radially outward from the tapered outer surface 43 of the main body 41 and extends in the height direction. The radially outward end face 42a of the rib 42 extends substantially parallel to the height direction.

[0034] The reflector 40 further has a projection 47 that protrudes to the second side from the second end face of the rib 42. As shown in Figure 7, the reflector 40 is fitted into the cover 30 through the opening on the flange 32 side of the cover 30 with its flared side facing the first side. This fitting is done so that the circumferential position of the rib 42 substantially coincides with the circumferential position of the center of the through hole 14a of the plate-shaped portion 14 of the frame 10.

[0035] As shown in Figure 2, the base member 50 is superimposed on the reflector 40 from the second side of the reflector 40. Figure 8 is a perspective view of the base member 50 from the oblique second side. As shown in Figure 8, the base member 50 is made of steel plate and has a through hole 51 through which the reflector 40 passes. The through hole 51 includes a cylindrical hole 52 and a plurality of rib insertion holes 53 that communicate with the cylindrical hole 52 and extend radially outward from the cylindrical hole 52. In this embodiment, it includes two rib insertion holes 53. The two rib insertion holes 53 are opposite each other in the radial direction of the cylindrical hole 52. The rib insertion holes 53 have a planar shape that corresponds to the planar shape of the rib 42.

[0036] As shown in Figure 9, with the pair of ribs 42 overlapping in the height direction in the pair of rib insertion holes 53, the base member 50 is brought closer to the reflector 40 from the second side of the reflector 40. Then, as shown in Figure 10, the pair of ribs 42 are fitted into the pair of rib insertion holes 53. The fitting of the pair of ribs 42 into the pair of rib insertion holes 53 makes the base member 50 immobile relative to the reflector 40 and positions it relative to the reflector 40.

[0037] As shown in Figure 8, the base member 50 has a plurality of mounting portions 54 on which the flat mounting portion 5d (see Figure 2) of the mounting spring 5 is placed, and in this embodiment, there are two mounting portions 54. The two mounting portions 54 are positioned opposite each other in the width direction of the substrate 61 (see Figure 11A), which has a substantially rectangular plate shape. The base member 50 further has a pair of plate-shaped ribs 55 that project from each mounting portion 54 to the second side. The pair of plate-shaped ribs 55 are spaced apart in the longitudinal direction and face each other, and extend in a direction including the width direction and the height direction. Through holes 57 are provided in the mounting portions 54, and through holes 5e (see Figure 2) are also provided in the mounting portion 5d of the mounting spring 5.

[0038] As shown in Figure 2, the mounting spring 5 is superimposed on the second side of the base member 50. Specifically, the mounting portion 5d is placed on the mounting portion 54 such that the through hole 5e of the mounting portion 5d coincides in the height direction with the through hole 57 of the mounting portion 54, and both longitudinal side edges of the mounting portion 5d abut against a pair of plate-shaped ribs 55. The mounting portion 5a of the mounting spring 5 has a pair of ribs 5c (see Figure 1) that extend longitudinally on both longitudinal sides. This pair of ribs 5c engages in the width direction with the pair of plate-shaped ribs 55 when the mounting portion 5d is positioned at the mounting location on the mounting portion 54. The pair of plate-shaped ribs 55 act as stoppers to prevent the mounting spring 5 from rotating relative to the base member 50.

[0039] Next, as shown in Figure 10, the light source module 60 is brought closer to the base member 50 in the height direction from the second side of the base member 50 and brought into contact with the annular end face 29 on the second side of the reflector 40 that protrudes from the base member 50. Figure 11A is a perspective view of the light source module 60 when viewed from the first oblique side, and Figure 11B is a perspective view of the light source module 60 when viewed from the second oblique side.

[0040] As shown in Figure 11A, the light source module 60 includes a substrate 61, a light-emitting unit 62 mounted on the first surface 61a of the substrate 61, and a power supply unit 63 mounted on the second surface 61b of the substrate 61. In this embodiment, the light-emitting unit 62 includes a plurality of SMD (Surface Mount Device) type LED chips 62a. The plurality of LED chips 62a are arranged, for example, at equal intervals on the same circle.

[0041] The power supply unit 63 includes a plurality of electronic components 63a. The plurality of electronic components 63a include, for example, one or more capacitors and one or more coils. The power supply unit 63 converts AC power to DC power and steps down the voltage to a predetermined voltage.

[0042] The light-emitting unit 62 is mounted on the first longitudinal side of the first surface 61a on the first side in the height direction of the substrate 61. Also, as shown in Figure 11B, the power supply unit 63 is mounted on the second longitudinal side of the second surface 61b on the second side in the height direction of the substrate 61.

[0043] In this embodiment, the light-emitting unit 62 is positioned at a longitudinal distance from the power supply unit 63. The power supply unit 63 is not positioned on the opposite side of the area where the light-emitting unit 62 is located, thereby improving the heat dissipation of the heat generated by the LED chip 62a. Reflow components such as ceramic capacitors and ICs may or may not be mounted on the first surface 61a of the substrate 61 at a longitudinal distance from the light-emitting unit 62.

[0044] The substrate 61 has a pair of through holes 65 on its first longitudinal side. The pair of through holes 65 are spaced apart in the width direction of the substrate 61. As shown in Figure 10, with a pair of protrusions 47 of the reflector 40 overlapping the pair of through holes 65 of the light source module 60 in the height direction, the light source module 60 is brought closer to the reflector 40 from the second side. Then, as shown in Figure 12, the pair of protrusions 47 are fitted into the pair of through holes 65. The fitting of the pair of protrusions 47 into the pair of through holes 65 makes it impossible for the light source module 60 to move relative to the reflector 40, thus positioning it relative to the reflector 40.

[0045] As shown in Figure 13, the base member 50 has a bottom plate portion 56 and a pair of side wall portions 9 that protrude from both ends of the bottom plate portion 56 in the width direction (coinciding with the width direction of the substrate 61) to the second side in the height direction. The pair of side wall portions 9 also have a pair of first locking pieces 58 and a pair of second locking pieces 59 that are spaced apart in the longitudinal direction of the base member 50 (coinciding with the longitudinal direction of the substrate 61).

[0046] The pair of first locking pieces 58 are at the same height and face each other in the width direction. The pair of second locking pieces 59 are also at the same height and face each other in the width direction. As shown in Figures 8 and 13, the pair of first locking pieces 58 and the pair of second locking pieces 59 are bendable inward in the width direction of the base member 50 and can be folded back.

[0047] As shown in Figure 14, after making the light source module 60 immobile relative to the reflector 40, the pair of first locking pieces 58 are bent inward in the width direction of the base member 50 so as to pivot in a substantially orthogonal direction. Then, the pair of first locking pieces 58 press the first side in the longitudinal direction of the second surface 61b of the substrate 61 against the first side in the height direction. After making the light source module 60 immobile relative to the reflector 40, the pair of second locking pieces 59 are bent inward in the width direction of the base member 50 so as to displace the height position of their tips towards the first side. Then, the pair of second locking pieces 59 press the second side in the longitudinal direction of the second surface 61b of the substrate 61 against the first side in the height direction.

[0048] In this way, even if stress is applied to the side of the light source module 60 away from the reflector 40 due to lifting of the base member 50, excessive stress is less likely to be applied to the substrate 61, thereby suppressing bending of the substrate 61.

[0049] Figure 15 is a plan view of the lighting fixture 1, showing the cover 30, the reflector 40, and the first surface 61a of the substrate 61 as viewed from the first side in the height direction. The annular end face 29 of the reflector 40 is in contact with the periphery of the area on the first surface 61a of the substrate 61 where the light-emitting unit 62 is mounted. More specifically, after making the light source module 60 immovable relative to the reflector 40, in the plan view shown in Figure 15, the center of the circular opening 48 on the first side of the reflector 40 and the center of the light-emitting unit 62 substantially coincide, and the center of the opening 48 and the center of the light-emitting unit 62 substantially overlap in the height direction.

[0050] Next, the configuration of the terminal block 70 and the positioning of the terminal block 70 relative to the base member 50 will be described. Figure 16A is a perspective view of the terminal block 70 as seen from the side connected to the power supply unit 63 and from the second oblique side, and Figure 16B is a perspective view of the terminal block 70 as seen from the opposite side from the side connected to the power supply unit 63 and from the second oblique side. Figure 16C is a perspective view of the terminal block 70 as seen from the opposite side from the side connected to the power supply unit 63 and from the first oblique side.

[0051] The terminal block 70 is a component that electrically connects AC power from the commercial power supply to the power supply unit 63. As shown in Figure 16A, the terminal block 70 has a pair of blade-shaped terminals 71 that are spaced apart in the width direction (corresponding to the width direction of the circuit board 61).

[0052] As shown in Figure 16B, the terminal block 70 has a pair of first through-holes 72 and a pair of second through-holes 73 that are spaced apart in the height direction. The pair of first through-holes 72 are spaced apart in the width direction and are at the same height. Similarly, the pair of second through-holes 73 are spaced apart in the width direction and are at the same height. For example, a ground wire of a commercial power supply (not shown) is inserted into one of the pair of first through-holes 72 and electrically connected to one of the blade-shaped terminals 71, while a commercial power supply wire is electrically connected to the other of the pair of first through-holes 72 and electrically connected to the other blade-shaped terminal 71.

[0053] Furthermore, one of the pair of second through holes 73 is a hole through which wiring electrically connected to the ground wire passes, and the other of the pair of second through holes 73 is a hole through which wiring electrically connected to the wire passes. The pair of second through holes 73 are used when installing multiple lighting fixtures 1 in a building and supplying AC power from the commercial power source to other lighting fixtures 1 via lighting fixture 1. As shown in Figure 16C, the terminal block 70 has a pair of protrusions 74 that project to the first side.

[0054] Figure 17 is a perspective view of the terminal block cover 90. The terminal block cover 90 covers the commercial power supply connection side of the terminal block 70 and has thin-walled sections corresponding to the insertion holes 72, 73 and the tool insertion hole 79. Although not described in detail, the tool insertion hole 79 is a hole through which a tool such as a flathead screwdriver is inserted when electrically connecting external wiring to the blade-shaped terminal 71 or when detaching wiring from the terminal block 70. By inserting the tip of a tool into the tool insertion hole 79, the gap between the pair of metal parts that grip the wiring (ground wire and wire) is temporarily widened, making it possible to connect or detach the wiring.

[0055] The terminal block may have any internal structure that allows the ground wire and wires on the AC power supply side to be electrically connected to a pair of blade-shaped terminals 71, and any known structure may be used to make such electrical connections. The terminal block cover 90 is made of a rubber material such as elastomer or silicone. When connecting external wiring, the wiring penetrates a portion of the thin-walled part of the terminal block cover 90. The terminal block cover 90 prevents foreign matter released from the heat insulating material from entering the terminal block 70.

[0056] As shown in Figure 16B, the terminal block 70 has three protruding ridges 77a, 77b, and 77c on the second side surface and both side surfaces. Also, as shown in Figure 17, the terminal block cover 90 has three through holes 91a and 91c corresponding to the protruding ridges 77a, 77b, and 77c. As shown in Figure 18, the terminal block cover 90 is attached to the terminal block 70 by inserting the three protruding ridges 77a, 77b, and 77c through the three through holes 91a and 91c. Note that the lighting fixture of this disclosure does not necessarily have a terminal block cover.

[0057] Next, the positioning of the terminal block 70 relative to the base member 50 will be described. As shown in Figure 13, the base member 50 has a pair of through holes 46 on the second side in the longitudinal direction. On the other hand, the terminal block 70 has a pair of protrusions 74 that project outwards to the first side. As shown in Figure 19, these pair of protrusions 74 are fitted into the pair of through holes 46 from the second side, and as shown in Figure 20, each of the pair of blade-shaped terminals 71 of the terminal block 70 is inserted into a pair of blade-receiving portions 69 of the power supply unit 63. Each blade-receiving portion 69 includes a metal clamping portion that holds the blade-shaped terminal 71. In this way, the terminal block 70 is positioned relative to the base member 50.

[0058] Next, as shown in Figure 2, the steel top plate 80 is brought closer to the base member 50 in the height direction from the second side of the base member 50, and the top plate 80 is placed on top of the base member 50. Then, the top plate 80 is positioned on the terminal block 70 and fixed to the base member 50. Figure 21A is a perspective view of the top plate 80 when viewed from the first oblique side, and Figure 21B is a perspective view of the top plate 80 when viewed from the second oblique side. As shown in Figure 21A, the top plate 80 is a cover member that covers the second side in the height direction and at least a part of the side of the light source module 60.

[0059] The top plate 80 includes a first top plate section 81, a second top plate section 82, and a third top plate section 83. The first top plate section 81 covers the first longitudinal side of the light source module 60 and is located on the first height side, extending in a substantially orthogonal direction. The second top plate section 82 connects to the second longitudinal side of the first top plate section 81. The second top plate section 82 is inclined so that it moves towards the second height side as it moves towards the second longitudinal side. The third top plate section 83 also connects to the second longitudinal side of the second top plate section 82 and extends in a substantially orthogonal direction.

[0060] As a result, as shown in Figure 21B, the height of the top plate 80 is higher on the second side in the longitudinal direction than on the first side. Therefore, the height of the side walls 84a of the top plate 80 is lower on the pair of side walls 84a on the first side in the longitudinal direction than on the pair of side walls 84b on the second side in the longitudinal direction, and the space that the top plate 80 accommodates is larger on the second side in the longitudinal direction than on the first side.

[0061] The top plate 80 has a pair of plate-like portions 85 that extend outward in the width direction from the first end of a pair of side wall portions 84a. The plate-like portions 85 extend in a substantially perpendicular direction. Each plate-like portion 85 has a through hole 88. The top plate 80 has a recess 98 for fixing the terminal block 70 to the second side wall 97 in the longitudinal direction. The top plate 80 also has a pair of protrusions 86 that project from the side wall 97 toward the first side.

[0062] Figure 22 is a cross-sectional view of the lighting fixture 1 around the terminal block 70, including the height direction and the insertion direction of the terminal block 70. As shown in Figure 22, the terminal block 70 has a groove 95 extending in the width direction on the second end face, and the top plate 80 has a plate-like portion 96 that fits into the groove 95. Also, as shown in Figure 8, the base member 50 has a pair of through holes 39 on the second side in the longitudinal direction, having a planar shape (planar shape when viewed from the height direction) that corresponds to the planar shape (planar shape when viewed from the height direction) of a pair of protrusions 86. The through holes 39 may be slit-shaped, and the protrusions 86 may have a plate shape.

[0063] As shown in Figure 22, the plate-shaped portion 96 is fully inserted into the groove 95 of the terminal block 70, which is positioned relative to the base member 50, and as shown in Figure 23, the pair of protruding portions 86 are inserted into the pair of through holes 39. Then, as shown in Figure 19, the protruding portion 86a of the protruding portion 86 that protrudes from the through hole 39 to the first side is crimped and folded back in a substantially perpendicular direction, thereby firmly fixing the top plate 80 to the base member 50. The insertion of the plate-shaped portion 96 into the groove 95 of the terminal block 70 allows the terminal block 70 to be positioned on the top plate 80.

[0064] When the top plate 80 is fixed to the base member 50 in this manner, as shown in Figure 24, the plate-shaped portion 85 of the top plate 80 overlaps from the second side with the flat mounting portion 5d (see Figure 2) of the mounting spring 5 which is placed on the mounting portion 54 (see Figure 8) of the base member 50. Furthermore, when the mounting portion 54 is restrained by a pair of plate-shaped ribs 55 with the through hole 5e (see Figure 2) of the mounting portion 5d overlapping with the through hole 57 (see Figure 8) of the mounting portion 54, the through hole 88 of the plate-shaped portion 85 of the top plate 80 also overlaps with the through hole 5e and the through hole 57 in the height direction, and furthermore, it also overlaps with the through hole 14a of the frame 10 in the height direction.

[0065] As shown in Figures 24 and 25, a single, inseparable male screw 7 is tightened from the second side into the four through holes 88, 5e, 57, and 14a that overlap in the height direction. Since the through hole 14a, located on the first side, is a screw hole, tightening this male screw 7 fixes the top plate 80, mounting spring 5, base member 50, and frame 10 together, integrating them as a single unit. Note that the tightening of the male screw 7 and the crimping of the protruding portion 86a in a substantially perpendicular direction may be performed in either order.

[0066] As described above, the packing 20 is positioned on the flange 13 such that the circumferential positions of the multiple notches 22 coincide with the circumferential positions of the multiple plate-shaped portions 14. When the top plate 80, mounting spring 5, base member 50, and frame 10 are fixed in this state, as shown in Figure 1, a part of the mounting spring 5 fits into the notches 22 of the packing 20, making it virtually impossible for the packing 20 to rotate relative to the mounting spring 5.

[0067] As described above, the lighting fixture 1 is integrated into a single unit by the positioning structure between the multiple pairs of members, and by the fixing of the top plate 80, mounting spring 5, base member 50, and frame 10 with male screws 7.

[0068] Figure 26 is a cross-sectional view of the second side of the integrated lighting fixture 1, and Figure 27 is an enlarged cross-sectional view of the area around the reflector 40 in Figure 26. Figure 28 is an enlarged cross-sectional view of the area around the flange 32 of the cover 30 of the integrated lighting fixture 1. As shown in Figure 26, the tall power supply unit 63 is housed in the space enclosed by the second top plate portion 82, the third top plate portion 83, and the substrate 61.

[0069] Furthermore, the cone-shaped reflector 40 contacts the first surface 61a of the substrate 61 of the light source module 60 so that its first edge pushes upward. The second surface of the light source module 60, opposite to the first surface on which the light-emitting unit 62 is mounted, is flat. The first surface of the first top plate 81 is in wide contact with this flat surface.

[0070] The flange 32 of the cover 30 is elastic and functions as a packing, and is compressible. As shown in Figures 27 and 28, the flange 32 is sandwiched and compressed between the frame 10 and the base member 50 by fixing the top plate 80, mounting spring 5, base member 50 and frame 10 using the male screw 7 described above. This compression of the flange 32 maintains a state in which the reflector 40, which is located inside the cover 30, is always pushing the substrate 61 of the light source module 60 upward to the second side. The compression of the flange 32 can absorb tolerance variations of the reflector 40, and the substrate 61 and the first top plate portion 81 of the top plate 80 can be brought into close contact.

[0071] As a result, the heat emitted from the light-emitting part 62 mounted on the first surface portion located on the opposite side of the second surface portion that is in close contact with the first top plate portion 81 can be transferred over a wide area to the third top plate portion 83 via the second top plate portion 82, as shown by arrow A in Figure 26, and the heat can be dissipated to the outside in the directions shown by arrows B1, B2, and B3.

[0072] It is preferable to construct the top plate 80 from a metal with high heat dissipation properties, such as aluminum, as this allows for efficient heat dissipation. Furthermore, since the flange 32 is sandwiched and compressed between the frame 10 and the base member 50, it is possible to reliably prevent insects and foreign objects from entering the interior of the lighting fixture 1 from between the frame 10 and the base member 50, thereby realizing a lighting fixture 1 with excellent insect-resistant properties.

[0073] As described above, lighting fixture 1 is a lighting fixture in which at least a part is placed inside a hole provided in a building. Lighting fixture 1 also comprises a substrate 61 on which a light-emitting part 62 is mounted on a first surface 61a and an electronic component 63a is mounted on a second surface 62b opposite to the first surface 61a, and a top plate 80 which is positioned to cover the second surface 61b in the height direction. The electronic component 63a is mounted at spaced-out locations on the back portion 61c (see Figure 27) of the light-emitting part 62 on the second surface 61b, and the back portion 61c is in contact with the top plate 80.

[0074] According to this disclosure, a top plate 80, which is an essential component that covers the second side of the substrate 61 and has a large volume and high heat capacity, is used to bring the top plate 80 into contact with the back portion 61c of the light-emitting part 62 on the second surface 61b. That is, the back portion 61c, which is located on the back side of the light-emitting part 62 on the substrate 61 and becomes hot, is in close contact with the top plate 80, which has a high heat capacity. Therefore, the heat emitted by the light-emitting part 62 can be efficiently dissipated using an essential component, making it easier to create a simple structure for the lighting fixture 1 and to efficiently dissipate the heat emitted by the light-emitting part 62.

[0075] Furthermore, the lighting fixture 1 may include a reflector 40 having an end face 29 that abuts around the area on the first surface 61a where the light-emitting unit 62 is mounted, and a tapered inner surface 45 that reflects light from the light-emitting unit 62. The substrate 61 may be sandwiched between the reflector 40 and the top plate 80.

[0076] With this configuration, the reflector 40 can be used to bring the substrate 61 and the top plate 80 into close contact, allowing the heat generated in the light-emitting section 62 to be efficiently dissipated.

[0077] Furthermore, the lighting fixture 1 may be provided with a flange (buffer) 32 that is compressible in the height direction and capable of absorbing tolerances in the height direction. The substrate 61 may then be sandwiched between the reflector 40 and the top plate 80 by the height compression of the flange 32.

[0078] With this configuration, even if tolerances occur in components such as the reflector 40, these tolerances can be absorbed by the compression of the flange 32 in the height direction, allowing the substrate 61 to be in close contact with the top plate 80. Therefore, a lighting fixture 1 with excellent heat dissipation performance can be realized regardless of individual differences.

[0079] Furthermore, the lighting fixture 1 may also include a base member 50 to which the top plate 80 is fixed and which covers a part of the first surface 61a in the height direction, and a frame 10 having a tapered inner circumferential surface 12b that defines the opening on the light-emitting side of the light emitted by the light-emitting part 62. In addition, a flange 32 which is a buffer part may be sandwiched between the base member 50 and the frame 10.

[0080] This configuration allows the compression structure of the buffer section to be realized with a simple structure.

[0081] Furthermore, the lighting fixture 1 may also include a cover 30 that includes a translucent body 31 and a flange 32 that is integrated with the body 31 and located at the end opposite to the light-emitting side. The buffer portion may also be the flange 32.

[0082] With this configuration, a buffer portion placed at the second end of the translucent cover 30 can be used to achieve a close contact structure between the substrate 61 and the top plate 80.

[0083] Furthermore, the top plate 80 may have a top plate portion (third top plate portion 83) that protrudes in the opposite direction to the direction of light emitted by the light-emitting portion 62, and a pair of side wall portions 84b connected thereto, in a portion separate from the portion that abuts the second surface 61b. The electronic component 63a may be covered by the third top plate portion 83 and the pair of side wall portions 84b (see Figure 21B).

[0084] With this configuration, even if the lighting fixture 1 has tall electronic components 63b (see Figure 11B), the tall electronic components 63b can be easily protected by the top plate 80.

[0085] This disclosure is not limited to the embodiments and their modifications, and various improvements and modifications are possible within the scope of the claims of this application and their equivalents.

[0086] For example, in the above embodiment, the flange 32, which is integrally formed with the main body 31 of the cover 30, is used as the buffer. However, a buffer that can be compressed in the height direction (for example, made of an elastic material) may be provided at the second end of the frame, or at any location in the height direction of the lighting fixture. Alternatively, the lighting fixture of this disclosure may not have a buffer that can be compressed in the height direction.

[0087] Furthermore, in the lighting fixture of this disclosure, if the amount of heat generated from the light-emitting part is large, a heat transfer material such as grease may be applied to the surface where the substrate and the top plate come into contact. In addition, the heat dissipation of the lighting fixture may be improved by integrally configuring or attaching heat dissipation fins to the second side of the top plate, particularly the second side of the first top plate portion (the side opposite the light-emitting part).

[0088] Furthermore, although the case in which the substrate 61 is sandwiched between the reflector 40 and the top plate 80 has been described, the substrate may also be sandwiched between other members and the top plate. For example, the lighting fixture may have a substrate fixing part for fixing the substrate, and the substrate may be sandwiched between the top plate and the substrate fixing part. The reflector may also be fixed to the substrate fixing part.

[0089] Furthermore, the case in which the main components, the top plate 80, the base member 50, and the frame 10, are all fixed to each other using the same male screw 7 has been described. However, the through holes in the top plate, the main body, and the frame may all be through holes without female threads, and the top plate, the main body, and the frame may be fixed together using male screws (bolts) and nuts. Alternatively, the top plate, the main body, and the frame may be fixed using other well-known fastening means.

[0090] Furthermore, in the lighting fixture of this disclosure, the two locking parts that lock together may be configured in any structure as long as they can lock together. For example, if one locking part is a protrusion and the other locking part that locks to it is a through hole, a bottomed hole, a groove, or a notch, the structures of the locking parts may be reversed, or one locking part may be a through hole, a bottomed hole, a groove, or a notch and the other locking part that locks to it may be a protrusion. [Explanation of symbols]

[0091] 1 Lighting fixture, 5 Mounting spring, 5d Mounting part of mounting spring, 5e Through hole of mounting part, 7 Male screw, 10 Frame, 13 Frame flange, 14 Plate-shaped part of frame, 14a Through hole of frame, 20 Packing, 22 Notch of frame, 29 End face of reflector, 30 Cover, 31 Main body, 32 Flange, 35 Notch of flange, 39 Through hole of base member, 40 Reflector, 42 Rib of reflector, 46 Through hole of base member, 47 Protruding part of reflector, 50 Base member, 53 Rib insertion hole of base member, 54 Mounting part of base member, 55 Rib of base member, 58 First locking piece, 59 Second locking piece, 60 Light source module, 61 Substrate, 61a First side of the circuit board, 61b Second side of the circuit board, 61c Back side, 62 Light-emitting part, 62a LED chip, 63 Power supply, 63a, 63b Electronic components, 65 Through hole in the circuit board, 69 Blade receiving part, 70 Terminal block, 71 Terminal, 74 Protruding part of the terminal block, 80 Top plate, 81 First top plate part, 82 Second top plate part, 83 Third top plate part, 84b Side wall part, 85 Plate-like part of the top plate, 86 Protruding part of the top plate, 86a Protruding part, 88 Through hole in the plate-like part of the top plate, 90 Terminal block cover, 95 Groove in the terminal block, 96 Plate-like part of the top plate.

Claims

1. A lighting fixture in which at least a portion is placed inside a hole provided in a building, A substrate having a light-emitting unit mounted on the first surface and multiple electronic components mounted on the second surface opposite to the first surface, A top plate is provided which is arranged to cover the second surface in the height direction, The aforementioned electronic component is mounted at a location on the second surface that is separated from the back side of the light-emitting portion in the direction along the mounting surface of the substrate. The aforementioned underside portion comes into contact with the top plate, A lighting fixture in which the top plate has a first top plate portion that overlaps the light-emitting portion in the height direction, a third top plate portion arranged substantially parallel to the first top plate portion, and a second top plate portion that connects the first top plate portion and the third top plate portion and inclined toward the side opposite to the light-emitting portion in the height direction as it moves from the first top plate portion to the third top plate portion, and the electronic component overlaps the second top plate portion in the height direction.

2. The first surface comprises a reflector having an end surface that abuts around the area on which the light-emitting part is mounted, and an inner surface that reflects light from the light-emitting part. The lighting fixture according to claim 1, wherein the substrate is sandwiched between the reflector and the top plate.

3. The lighting fixture according to claim 1 or 2, comprising a buffer portion that is compressible in the height direction and capable of absorbing tolerances in the height direction.

4. The top plate is fixed to a base member that covers a portion of the first surface in the height direction, The light-emitting part comprises a frame having an inner circumferential surface that defines an opening on the light-emitting side, The buffer portion is sandwiched between the base member and the frame. The lighting fixture according to claim 3.

5. A lighting fixture in which at least a portion is placed inside a hole provided in a building, A substrate having a light-emitting part mounted on the first surface and electronic components mounted on the second surface opposite to the first surface, A top plate is provided which is arranged to cover the second surface in the height direction, The aforementioned electronic component is mounted at a location on the second surface that is separated from the back side of the light-emitting portion in the direction along the mounting surface of the substrate. The aforementioned underside portion comes into contact with the top plate, The aforementioned part is compressible in the height direction and includes a buffer that can absorb tolerances in the height direction, The top plate is fixed to a base member that covers a portion of the first surface in the height direction, The light-emitting part comprises a frame having an inner circumferential surface that defines an opening on the light-emitting side, The buffer portion is sandwiched between the base member and the frame, The cover comprises a translucent body and a flange that is integrated with the body and located at the end opposite to the light-emitting side. The buffer portion is the flange of the lighting fixture.

6. The top plate has a portion that protrudes in the opposite direction to the direction of light emitted by the light-emitting portion, and a pair of side wall portions connected thereto, in a portion separate from the portion that abuts the second surface. The lighting fixture according to claim 1 or 2, wherein the electronic component is covered by the top plate portion and the pair of side wall portions.

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