lighting fixtures

Abstract

To provide a lighting fixture capable of suppressing a decrease in heat dissipation performance and an increase in weight. [Solution] A lighting fixture 1 comprising a light source substrate 42 on which multiple light-emitting elements are mounted, a plate-shaped light source substrate mounting plate 10 with high thermal conductivity and the light source substrate 42 attached to its underside 11B, and an arm 6 with high thermal conductivity that supports the light source substrate mounting plate 10, wherein the light source substrate mounting plate 10 is provided with arm connecting pieces 14 formed by bending upward into an L-shape each of the edges on both sides that sandwich the mounting portion 11 to which the light source substrate 42 is attached, and the arms 6 are connected to each arm connecting piece 14.

Description

[Technical Field]

[0001] The present invention relates to a lighting fixture. [Background technology]

[0002] In lighting fixtures in which the fixture body is supported on the ceiling surface by an arm, a large number of heat dissipation fins are provided on the upper surface of the fixture body to dissipate heat from the light source installed inside the fixture body (see, for example, Patent Documents 1 to 5). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-29214 [Patent Document 2] Japanese Patent Application Publication No. 2018-77957 [Patent Document 3] Japanese Patent Application Publication No. 2018-195459 [Patent Document 4] Japanese Patent Application Publication No. 2017-41328 [Patent Document 5] Japanese Patent Application Publication No. 2017-208364 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if dust accumulates on the heat dissipation fins, the heat dissipation performance will decrease, and if the ceiling is high, it is not easy to clean the heat dissipation fins on the top surface of the appliance body. Furthermore, since the overall height of the fixture body is increased by the length of the heat dissipation fins, the strength of the arm needs to be increased to ensure vibration resistance, but strengthening the arm ends up increasing the weight of the lighting fixture.

[0005] An object of the present invention is to provide a lighting fixture that can suppress a decrease in heat dissipation performance and an increase in weight. [Means for solving the problem]

[0006] The present invention relates to a light source substrate on which a plurality of light emitting elements are mounted, Below a light source board mounting plate having a plate shape and high thermal conductivity attached to a surface; a power supply device including an electric circuit for generating power to be supplied to the light source board; and an arm having high thermal conductivity and supporting the light source board mounting plate; the light source substrate is attached in a state where the entire surface of the light source substrate is in contact with the lower surface of the light source substrate attachment plate, a support part that supports the power supply unit is formed in a box shape with one side open, and the support part is installed on the upper surface of the light source board mounting plate with the open side facing the upper surface of the light source board mounting plate and the open side being blocked by the upper surface of the light source board mounting plate; the support part supports the power supply unit so as to separate the power supply unit and the light source board mounting plate in the vertical direction by attaching the power supply unit to the side of the support part that faces the open side; the power supply unit is floating above the upper surface of the light source board mounting plate to provide a gap; and the light source board mounting plate does not have any heat dissipation fins in the gap.

[0007] The present invention provides the above lighting fixture, the light source board mounting plate is provided with arm connecting pieces formed by bending each of the edge portions on both sides of the mounting portion to which the light source board is mounted upward into an L-shape so as to surround the power supply device; It is characterized by:

[0008] The present invention provides the above lighting fixture, The arm connecting piece is formed in a mountain shape that becomes higher toward the center of the side of the light source board mounting plate, the maximum length of the arm connecting piece in the front-to-rear direction is shorter than the total length of the mounting part in the front-to-rear direction, and the arm is connected by making face contact with the center part of the arm connecting piece, and each of the arm connecting pieces is provided with a plurality of through-hole portions that open facing the power supply unit.

[0009] The present invention provides the lighting fixture as described above, wherein the power supply device has a power supply board, and the power supply board is disposed inside the box-shaped support portion so as to be spaced apart from the light source board mounting plate, Opposite the open surface the support portion The face The present invention is characterized in that the signal is fixed to the

[0010] The present invention is characterized in that, in the lighting fixture described above, the power supply device has an opening communicating with the interior at a position that does not face any of the arm connecting pieces. [Effects of the Invention]

[0011] According to the present invention, it is possible to suppress a decrease in heat dissipation performance and an increase in weight. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of a lighting fixture according to an embodiment of the present invention, viewed obliquely from below. [Figure 2] FIG. 2 is a perspective view of the lighting fixture as viewed obliquely from above. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 4 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. 10 is a diagram showing the configuration of a lighting fixture according to a first modified example of the present invention. [Figure 11] 10A and 10B are diagrams showing the configuration of a lighting fixture according to a second modified example of the present invention, where (A) shows the configuration with a square light source unit when viewed from the bottom, and (B) shows the configuration with a rectangular light source unit when viewed from the bottom. [Figure 12] FIG. 10 is a diagram showing the configuration of a lighting fixture according to a third modified example of the present invention. [Figure 13] FIG. 10 is a diagram showing the configuration of a lighting fixture according to a fourth modified example of the present invention. [Figure 14] FIG. 10 is a diagram showing the configuration of a lighting fixture according to a fifth modified example of the present invention. [Figure 15] FIG. 10 is a diagram showing the configuration of a lighting fixture according to a sixth modified example of the present invention. [Figure 16] FIG. 10 is a diagram showing the configuration of a lighting fixture according to a sixth modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view of a lighting fixture 1 according to this embodiment as seen obliquely from below, Fig. 2 is a perspective view of the lighting fixture 1 as seen obliquely from above, Fig. 3 is a top view of the lighting fixture 1, and Fig. 4 is an exploded view of the lighting fixture 1. The lighting fixture 1 of this embodiment is a ceiling lighting fixture to be installed on the ceiling surface of a high ceiling, etc. As shown in these figures, the lighting fixture 1 includes a fixture main body 4, an arm 6 that is fixed to the ceiling surface of a high ceiling, etc. and rotatably supports the fixture main body 4, and a power supply device 8 that supplies power to the fixture main body 4. In Figure 1, the direction in which the ceiling surface is located when viewed from the installed lighting fixture 1 is the upward direction of the paper, and this direction is defined as the upward direction of lighting fixture 1. The definitions of the directions of lighting fixture 1, including up, down, left, and right, are also shown in Figure 1.

[0014] The fixture body 4 has a light source board mounting plate 10 and a light source unit 12. 2 to 4, the light source board mounting plate 10 integrally includes a mounting portion 11 having a generally rectangular plate shape in plan view and a pair of arm connecting pieces 14. A power supply unit 8 is installed in the center of an upper surface 11A of the mounting portion 11. A light source unit 12 is provided on a lower surface 11B of the mounting portion 11, as shown in FIG.

[0015] The arm connecting pieces 14 are provided on both sides of the mounting part 11, and as shown in Figure 4, two press nuts 16 are provided on each arm connecting piece 14, one above the other, and the arm 6 is connected to each press nut 16 through a bolt 15. Note that press nuts are also called embedded nuts. These arm connecting pieces 14 are integrally formed with the mounting portion 11 by bending the edges on both sides of the light source board mounting plate 10 that sandwich the mounting portion 11 upward into an L shape. On the other hand, in the mounting portion 11, the leading end 11K1, which is the edge on the front side, and the rear end 11K2, which is the edge on the rear side, are not bent, and the portions between the leading end 11K1 and the rear end 11K2 and the power supply device 8 are formed as flat surfaces without any irregularities.

[0016] The light source board mounting plate 10 is made of a metal plate having high thermal conductivity and desired rigidity, and in this embodiment, an aluminum alloy with a thickness of 3 mm is used.

[0017] 5 is a cross-sectional view taken along line VV in FIG. 3, and FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. As shown in Figure 6, the power supply unit 8 includes a power supply board 20 on which an electrical circuit that generates power to be supplied to the light source unit 12 is mounted, a terminal block 21 to which wiring that transmits external power and lighting control signals is connected, and a metal power supply cover case 22 that houses these.

[0018] The power supply cover case 22 is in the shape of a bottomless box with the entire bottom surface open, and is fixed to the upper surface 11A of the mounting portion 11 with screws, with the bottom surface facing the light source board mounting plate 10 side. The power supply board 20 is fixed with an insulating space provided on the top surface 22A of the power supply cover case 22. This top surface 22A is provided with a plurality of press nuts 25 (FIG. 6) that are convex on the bottom surface side, and by screwing the power supply board 20 onto each press nut 25, the convex shape of the press nuts 25 ensures a predetermined insulating space. As shown in Figure 5, a through hole 26 is formed in the mounting portion 11, penetrating vertically, and the wiring extending from the power supply board 20 passes through the through hole 26 to the side of the lower surface 11B without passing outside the power supply cover case 22, and is connected to the light source portion 12.

[0019] As shown in FIG. 4, the power supply cover case 22 of this embodiment includes a case body 27 and a terminal block cover .

[0020] 6, the left and right side surfaces 29 have their lower ends bent into an L shape to form fixing pieces 30 for screwing onto the mounting portion 11. Inside the case body 27, a terminal block mounting piece 31 is provided substantially parallel to the left side surface 29. The terminal block 21 is fixed to this terminal block mounting piece 31 in a position close to the top surface 22A of the case body 27.

[0021] In the lighting fixture 1 of this embodiment, terminal block mounting pieces 31 are provided in two locations inside the case body 27, on the front surface 32 side and on the back surface 33 side (see FIG. 7). A terminal block 21 for input to its own power supply device 8 is fixed to one of the terminal block mounting pieces 31, and a terminal block 21 for a dimming control line is fixed to the other terminal block mounting piece 31. Note that if light control such as dimming is not required, the other terminal block 21 may not be provided.

[0022] In the case body 27 of this embodiment, the terminal block mounting piece 31 is formed by bending the left end portions of the front face 32 and the back face 33 in an L-shape toward the inside of the case body 27, thereby forming openings 34 (see FIGS. 8 and 9) at the left end portions of the front face 32 and the back face 33. Heat from the case body 27 is efficiently dissipated to the outside through these openings 34. As shown in FIGS. 4 and 6, the openings 34 of the front face 32 and the back face 33 are connected to each other, and a through passage A (see FIG. 6) extending in the front-to-rear direction is formed inside the case body 27.

[0023] As shown in Figures 4 and 6, terminal block cover 28 is fixed to left side surface 29 of case body 27 by fulcrum screw 28A so as to be rotatable in the direction of arrow B. As shown by the dashed line in Figure 7, a notch 14A may be provided in part of arm connecting piece 14 so that the head of fulcrum screw 28A is completely visible in side view without being hidden by arm connecting piece 14. Providing notch 14A makes it easier for an operator to use a screwdriver to tighten fulcrum screw 28A to prevent terminal block cover 28 from rotating when installing lighting fixture 1.

[0024] The terminal block cover 28 conceals the terminal block 21 by covering both the sides and the top of the opening 34, and at the same time, by leaving the front side (rear side) of the opening 34 open, ventilation is ensured inside the case main body 27. Furthermore, all of the openings 34 face the front and rear of the device main body 4, and are located in positions that do not face any of the arm connecting pieces 14, ensuring sufficient ventilation.

[0025] The light source unit 12 provides illumination using light-emitting elements as a light source, and as shown in Figures 5 and 6, it includes a light source board 42 on which multiple LEDs 40, which are an example of light-emitting elements, are mounted, and a front globe 44, which is a cover member that covers the light source board 42. The light source board 42 is a metal board in the shape of a substantially rectangular plate with excellent thermal conductivity, and is fixed with screws in a state where the entire surface of the light source board is in contact with the lower surface 11B of the mounting portion 11 of the light source board mounting plate 10, with an insulating sheet with excellent thermal conductivity sandwiched therebetween. The lower surface 11B of this mounting portion 11 is provided with an appropriate number of half pierces (also called dowels) for positioning the light source board 42.

[0026] As shown in FIG. 4 , the light source board 42 has wiring holes 43 opening at positions communicating with the through holes 26 of the mounting portion 11, and the wiring extending from the power supply board 20 passes through the wiring holes 43 and is pulled out to the mounting surface side of the light source board 42 and connected to the light source board 42. Appropriate bushings are fitted into the through holes 26 and the wiring holes 43 to protect the coating of the electric wires. It is preferable to use bushings that can seal the through holes. A resin substrate may also be used for the light source board 42. When a resin substrate is used for the light source board 42, the light source board 42 may be attached to the underside 11B of the light source board mounting plate 10 via thermal grease instead of a thermal sheet.

[0027] A large number of LEDs 40 are arranged on the mounting surface of the light source substrate 42, and light from each LED 40 is incident on the opposing front globe 44. The color (wavelength) of light emitted by each LED 40 is appropriate, and in this embodiment, white light is used. The LEDs 40 are arranged on the mounting surface of the light source substrate 42, avoiding a predetermined range including the center thereof.

[0028] The front globe 44 is a thin, open-top box that covers the light source board 42, and is made of a translucent resin or glass material, and is fixed with screws to the underside 11B of the mounting part 11. The entire surface of the front globe 44 is milky white, and by scattering the light from the light source part 12 as it passes through, uneven illumination and bright spots of the LEDs 40 reflected on the front globe are made less noticeable.

[0029] As shown in Figure 4 above, the arm 6 is a member made of a material with high thermal conductivity formed into an approximately U-shape, and is integrally provided with a pair of support bar portions 50 extending parallel to each other and a connecting bar portion 51 extending perpendicular to these support bar portions 50 and connecting the upper ends 50A of the support bar portions 50 together.

[0030] The connecting bar portion 51 is provided with a plurality of fixing holes 52, and is fixed to the ceiling surface (installation surface) by passing bolts through the appropriate fixing holes 52. In addition, a fastening hole 53 and an arc hole 54, which is an elongated hole in an arc shape centered on the fastening hole 53, are provided on the side of the lower end portion 50B of each support bar portion 50. The arm 6 is fixed to the arm connecting piece 14 of the light source board mounting plate 10 by passing bolts 15 through the fastening holes 53 and the arc hole 54. When fixing, the light source board mounting plate 10 is rotated within the range of the elongated holes of the arc hole 54 around the fastening hole 53 as a fulcrum, so that the light source board mounting plate 10 is fixed at a desired angle. Appropriate devices such as various sensors, such as an illuminance sensor, and communication devices may be fixed to the support bar portion 50.

[0031] In the lighting fixture 1, the upper surface 11A of the fixture body 4 is not provided with heat dissipation fins that are provided in conventional general high ceiling lighting fixtures, and heat generated by the LEDs 40 is efficiently dissipated without providing such heat dissipation fins. More specifically, the heat generated by the LEDs 40 is transmitted to the light source board mounting plate 10 via the light source board 42. As shown in Figures 1 and 2, the top surface 11A of the mounting portion 11 of the light source board mounting plate 10 and the arm connecting pieces 14 on both sides thereof are exposed to the outside, and the heat generated by the LEDs 40 is dissipated to the outside from the top surface 11A and the arm connecting pieces 14.

[0032] As described above, each arm connecting piece 14 is integrally formed by bending the edges on both sides of the light source board mounting plate 10 that sandwich the mounting portion 11. In conventional lighting fixtures, the mounting portion 11 and the arm connecting piece 14 are made of separate members, and the amount of heat transferred is reduced due to contact resistance between them. The arm connecting piece 14 of this embodiment is approximately 3 mm thick, ensuring a sufficient cross-sectional area for a heat conduction path. This reduces the thermal resistance between the upper surface 11A of the mounting portion 11 and each arm connecting piece 14, allowing a large amount of heat to be quickly transferred to the end of the arm connecting piece 14. This allows for good heat dissipation performance without providing separate heat dissipation fins on the upper surface 11A of the mounting portion 11. In addition, the device body 4 can be made lighter because heat dissipation fins are no longer necessary.

[0033] In the lighting fixture 1 of this embodiment, as described above, the arm 6 is made of a highly thermally conductive material, and heat is conducted from the arm connecting piece 14 to the arm 6, and heat is dissipated from the entire arm 6, thereby further improving heat dissipation performance. In addition, as shown in Fig. 6, the lower end portion 50B of each support bar portion 50 of the arm 6 is fixed directly (without any intervening member) to the arm connecting piece 14 in surface contact. This reduces the thermal resistance between the arm connecting piece 14 and the arm 6, and increases the amount of heat dissipated from the arm 6, thereby achieving even better heat dissipation performance. In this embodiment, the arm 6 is made of a member made of SPCC (cold rolled steel plate) and having a thickness of about 2 mm.

[0034] 7 is a left side view of the lighting fixture 1, FIG. 8 is a front view of the lighting fixture 1, and FIG. 9 is a rear view of the lighting fixture 1. As shown in FIG. As shown in FIG. 8, the arm connecting piece 14 is formed so that its maximum height Hamax is approximately the same as the height Hb of the power supply device 8, or slightly lower than the height Hb of the power supply device 8 by a few millimeters. The internal space of the power supply device 8 must be large enough to keep the temperatures of the various components on the power supply board 20 and terminal block 21 within a specified temperature range, and it is also necessary to ensure an insulating distance between the power supply board 20 and the power supply cover case 22, and between the power supply board 20 and the top surface 11A of the mounting portion 11. The height Hb of the power supply device 8 (power supply cover case 22) in this embodiment is set to the minimum height that satisfies these requirements. By making the maximum height Hamax of the arm connecting piece 14 approximately the same as the height Hb of the power supply unit 8, the amount of protrusion of the fixture body 4 upward from the upper surface 11A can be limited to the height Hb of the power supply unit 8, and the heat dissipation effect of the arm connecting piece 14 can be maximized within the limit of that protrusion amount.

[0035] 8, the distance M from the power supply unit 8 (power supply cover case 22) to the connecting bar portion 51 of the arm 6 is greater than the height Hb of the power supply unit 8, ensuring sufficient space between the ceiling surface on which the arm 6 is installed and the power supply unit 8. It is preferable that the position of the power supply board 20 inside the power supply cover case 22 is higher than half the height Hb of the power supply unit 8.

[0036] In this embodiment, the height Hb of the power supply device 8 is 63 mm, and the distance M is 100 mm. The maximum height Hamax of the arm connecting piece 14 is 62 mm.

[0037] 7, each arm connecting piece 14 in this embodiment is formed in a substantially triangular shape (a substantially isosceles triangle shape in this embodiment) with an apex (maximum height Hamax) at the center of the instrument body 4. In this specification, a substantially triangular shape refers to a shape in which each apex of the triangle is chamfered. Furthermore, in the light source board mounting plate 10, the maximum length La in the front-to-rear direction of each arm connecting piece 14 is shorter than the overall length Lb of the mounting portion 11 in the front-to-rear direction. By configuring it in this manner, the four corners of the mounting portion 11 can be rounded. This prevents problems even if a person's hand touches the corners of the mounting portion 11 when transporting or installing the lighting fixture. In this embodiment, the maximum length La corresponds to the length of the base of the arm connecting piece 14, i.e., the length of the connection portion between the mounting portion 11 and the arm connecting piece 14, and this maximum length La is in the range of approximately 65% ​​to 90% of the overall length Lb of the mounting portion 11.

[0038] Each arm connecting piece 14 is formed with a plurality of through-holes 61 that penetrate from the front to the back to ensure ventilation. The through-holes 61 are provided with a width of approximately 10 to 20 mm from the outer periphery, taking into consideration the heat dissipation area of ​​the arm connecting piece 14 as a heat dissipation fin and the strength of the arm connecting member. In this embodiment, the ratio of the total opening area of ​​the through-holes 61 to the side area of ​​each arm connecting piece 14 (opening rate) is approximately 10% to 20%. Because the rigidity of the arm connecting piece 14 affects the earthquake resistance of the device itself, the thickness (plate thickness) of the arm connecting piece 14 should not be too thin in an effort to achieve ventilation and lightweight design. A fall prevention wire can also be passed through the through-holes 61.

[0039] In this way, the arm connecting piece 14 is formed in an approximately triangular shape, its maximum length La is shorter than the total length Lb of the mounting portion 11, and multiple through-hole portions 61 are provided, thereby making the arm connecting piece 14 lighter in weight.

[0040] Furthermore, the through-holes 61 of the arm connecting pieces 14 improve ventilation in the left-right direction of the fixture body 4, thereby improving the heat dissipation performance of the upper surface 11A between the pair of arm connecting pieces 14 and the power supply device 8. In a side view, each through-hole 61 widens vertically as it approaches the center of the fixture body 4, thereby increasing the opening area, thereby ensuring sufficient ventilation between the power supply device 8 located in the center and the arm connecting pieces 14. Each through-hole 61 may be used to fix an appropriate member such as a fall prevention wire or a guard member for protecting the front globe 44.

[0041] Various parameters such as the side area of ​​the arm connecting piece 14, the total opening area of ​​each through-hole portion 61, the maximum length La, the total length Lb of the mounting portion 11, and the area of ​​the upper surface 11A of the mounting portion 11 can be optimized for each light output of the light source portion 12 according to the required heat dissipation performance.

[0042] According to this embodiment, the following effects are achieved.

[0043] In the lighting fixture 1 of this embodiment, the light source substrate mounting plate 10 is provided with arm connecting pieces 14 formed by bending upward into an L-shape each of the edges on both sides of the mounting portion 11 to which the light source substrate 42 is attached, and an arm 6 is connected to each arm connecting piece 14.

[0044] According to this lighting fixture 1, heat generated by the LEDs 40 and transmitted to the light source board mounting plate 10 via the light source board 42 can be dissipated to the outside from the upper surface 11A of the mounting portion 11 and the arm connecting pieces 14 on both sides thereof. Furthermore, because each arm connecting piece 14 is integrally formed with the mounting portion 11 by bending, the thermal resistance between the upper surface 11A of the mounting portion 11 and each arm connecting piece 14 is small, and the heat transmitted from the light source board 42 to the mounting portion 11 is transmitted directly and smoothly by thermal conduction to each arm connecting piece 14, allowing for efficient heat dissipation. This allows for good heat dissipation performance to be achieved without providing separate heat dissipation fins, which can be degraded by dust accumulation, on the upper surface 11A of the mounting portion 11. Furthermore, the device body 4 can be made lighter by eliminating the need for heat dissipation fins.

[0045] In conventional high-bay lighting fixtures, there is almost no temperature rise due to heat transfer from the LED at the part of the housing where the arm is attached. In other words, in conventional high-bay lighting fixtures, the arm and arm attachment member do not contribute to the heat dissipation of the lighting fixture. In contrast, in lighting fixture 1 of this embodiment, a temperature rise was confirmed in arm connecting piece 14 and arm 6 while the lighting fixture was on, which shows that arm connecting piece 14 and arm 6 contribute to the heat dissipation of lighting fixture 1.

[0046] In the lighting fixture 1 of this embodiment, each arm connecting piece 14 is provided with a plurality of through-holes 61, which allows for a reduction in the weight of the fixture body 4 and ensures ventilation in the left-right direction of the fixture body 4. In addition, the fixture body 4 can also be used to fasten appropriate members such as a fall prevention wire or a guard member that protects the front globe 44.

[0047] In the lighting fixture 1 of this embodiment, the light source board mounting plate 10 has a maximum length La in the front-to-rear direction of the arm connecting piece 14 that is shorter than the total length Lb in the front-to-rear direction of the mounting portion 11, so the weight of the fixture body 4 can be made lighter.

[0048] In the lighting fixture 1 of this embodiment, each of the arm connecting pieces 14 has a substantially triangular shape, and therefore the weight of the fixture body 4 can be made lighter than when the arm connecting pieces 14 have the same maximum height Hamax and a rectangular shape when viewed from the side.

[0049] In the lighting fixture 1 of this embodiment, the arm 6 is in surface contact with the arm connecting piece 14, so that heat is smoothly transferred from the arm connecting piece 14 to the arm 6 and heat is efficiently dissipated from the entire arm 6, thereby achieving higher heat dissipation performance.

[0050] In the lighting fixture 1 of this embodiment, the maximum height Hamax of the arm connecting piece 14 is less than the height Hb of the power supply unit 8 provided on the upper surface 11A of the mounting portion 11, so the amount of protrusion of the fixture body 4 upward from the upper surface 11A can be limited to the height Hb of the power supply unit 8.

[0051] In the lighting fixture 1 of this embodiment, in the power supply unit 8, the power supply board 20 is fixed to the top surface 22A inside the power supply cover case 22, so that insulation from the mounting part 11 can be achieved and the effect of heat generated by the power supply board 20 on the mounting part 11 can also be reduced.

[0052] In the lighting fixture 1 of this embodiment, the power supply device 8 is provided with openings 34 that communicate with the interior at positions that do not face the arm connecting pieces 14, thereby ensuring good ventilation.

[0053] The above-described embodiment merely exemplifies one aspect of the present invention, and any modifications and applications are possible without departing from the spirit of the present invention.

[0054] (Variation 1) In the above-described embodiment, the light source unit 12 is configured to be rectangular when viewed from the bottom. However, it is also possible to configure a light source unit 112 that is approximately square when viewed from the bottom, as in the lighting fixture 100 shown in Fig. 10. In this case, the mounting unit 11 of the light source board mounting plate 10 may also be square when viewed from the bottom, matching the light source unit 112. By shortening the longitudinal direction of the light source unit 12 (light source board 42) that is rectangular when viewed from the bottom, it is possible to obtain a light source unit 112 that is square when viewed from the bottom, thereby easily realizing a lighting fixture 100 with lower light output than the lighting fixture 1.

[0055] (Variation 2) A plurality of light source units 12 may be provided on the underside 11B of the light source board mounting plate 10. For example, as in a lighting fixture 200 shown in Fig. 11(A), two square light source units 112 in bottom view shown in Fig. 10 may be provided side by side on the underside 11B of the light source board mounting plate 10. Furthermore, as in a lighting fixture 300 shown in Fig. 11(B), for example, two light source units 12 provided in the lighting fixture 1 of the above-described embodiment may be provided side by side on the underside 11B of the light source board mounting plate 10. By arranging a plurality of light source units 12, 112, lighting fixtures 200, 300 with a greater light output than lighting fixture 1 can be easily realized.

[0056] (Variation 3) When multiple light source units 12, 112 are provided on the light source board mounting plate 10, a power supply unit 8 may be provided for each light source unit 12, 112 side by side on the upper surface 11A of the light source board mounting plate 10, as in the lighting fixture 400 shown in Fig. 12. In this case, a connecting member 480 may be provided between the two power supply units 8 to fix the relative positions of the power supply units 8 and also serve as a wiring cover. Furthermore, in a lighting fixture 400 provided with multiple power supply cover cases 22, a power supply line can be routed between the terminal blocks 21 of the two power supply cover cases 22 through the through passage A when assembling the fixture. A dimming control line can also be routed internally in a similar manner.

[0057] (Variation 4) 13, a lighting fixture 500 may be provided with a guard member 585 that protects the light source unit 12. Support pieces 586 may be fixed to each arm connecting piece 14, and the guard member 585 may be supported by each support piece 586. By forming each support piece 586 from a highly thermally conductive material, like the arm 6, the heat dissipation performance can be further improved.

[0058] (Variation 5) As in the lighting fixture 600 shown in Figure 14, the power supply unit 8 may be arranged in a state where it is raised (with a gap) from the upper surface 11A of the mounting portion 11 of the light source substrate mounting plate 10, and a space Q may be provided between the mounting portion 11 and the power supply unit 8. Specifically, the power supply device 8 is supported by a support portion 70 provided on the upper surface 11A of the light source board mounting plate 10. The support portion 70 is provided away from the arm 6 and the arm connecting piece 14, and supports the power supply device 8 so as to separate the power supply device 8 from the light source board mounting plate 10 in the vertical direction. Note that there are no structures such as heat dissipation fins between the power supply device 8 and the light source board mounting plate 10. This improves the heat dissipation properties of the upper surface 11A of the mounting portion 11, thereby achieving higher heat dissipation performance.

[0059] (Variation 6) In cases where the light output of the lighting fixture 1 is relatively small, or where the luminous efficiency of the LED 40 is high and the amount of heat generated is small relative to the area of ​​the mounting portion, the area of ​​the arm connecting piece 14 can be further reduced. 15 and 16, the width of the rising portion 90 of the arm connecting piece 14 is the maximum length La of the arm connecting piece 14 in the front-to-rear direction, and a height of approximately 10 mm is ensured that it is 65% or more of the total length Lb of the mounting part 11 in the front-to-rear direction. The width Lc of the arm connecting part 91 above the rising portion 90 may be a rectangular shape with approximately the same dimensions as the arm 6. However, rather than simply forming a 90-degree corner at the boundary between the rising portion 90 and the arm connecting portion 91, it is preferable to provide a connecting region 92, such as a sloped or rounded concave curved surface, to alleviate stress concentration. When a sloped surface is provided, the dimensions of these connecting regions 92 should be set so that one side of an imaginary triangle when the arm connecting piece 14 is viewed from the side is at least 10 mm. For example, in the lighting fixture 700 of FIG. 15, the vertical dimension of the imaginary triangle is 10 mm and the horizontal dimension is 17.3 mm. In the case of a concave curved surface, it is preferable that the radius of the imaginary arc when the arm connecting piece 14 is viewed from the side is 10 mm or more. For example, in the lighting fixture 800 of FIG. 16, a curve with a radius of 10 mm is provided. When these configurations are adopted, arm connecting piece 14 can no longer be said to be approximately triangular, but they all have in common the fact that the dimension of the upper side of arm connecting piece 91 is shorter than the dimension of the lower side formed by bending from mounting portion 11. With such a shape, the amount of heat transferred from mounting portion 11 in light source board mounting plate 10 can be transferred to arm connecting piece 14 by thermal conduction, and a stable mounting state can be maintained even when the lighting fixture is installed on the ceiling by arm 6.

[0060] (Other variations) The power supply device 8 may be provided separately from the lighting fixture 1. The lighting fixture 1 may be installed on a wall surface as well as on a ceiling surface. The light source board mounting plate 10 and the arm 6 can be made of any alloy or metal that has high thermal conductivity required for dissipating heat from the light source unit 12 and can achieve the required rigidity. In the above-described embodiments, unless otherwise specified, directions such as horizontal and vertical, various numerical values, and shapes do not intentionally exclude the surrounding ranges of these directions and numerical values, and approximate shapes, but include the surrounding ranges and approximate shapes (so-called equivalent ranges) as long as they produce the same action and effect and do not deviate from the critical meaning of the numerical values. [Explanation of symbols]

[0061] 1, 200, 300, 400, 500, 600, 700, 800 Lighting fixtures 4. Instrument body 6 Arm 8 Power supply 10 Light source board mounting plate 11 Mounting part 12, 112 Light source section 14 Arm connector 20 Power supply board 22 Power supply cover case 22A Top 34 Opening 40 LEDs (light-emitting elements) 42 Light source board 61 Through-hole section Hamax arm connecting piece maximum height Hb Power supply height La Maximum length of arm connecting piece Lb Overall length of mounting part M distance

Claims

1. a light source substrate on which a plurality of light emitting elements are mounted; a plate-shaped light source substrate mounting plate having high thermal conductivity and having the light source substrate mounted on its underside; a power supply device including an electric circuit for generating power to be supplied to the light source board; an arm that supports the light source board mounting plate and has high thermal conductivity; Equipped with the light source substrate is attached in a state where the entire surface of the light source substrate is in contact with the lower surface of the light source substrate attachment plate, The support portion that supports the power supply device is formed in a box shape with one side open, the support portion is installed on the upper surface of the light source board mounting plate such that an open surface faces the upper surface of the light source board mounting plate and the open surface is closed by the upper surface of the light source board mounting plate, the support portion supports the power supply device so as to separate the power supply device from the light source board mounting plate in the up-down direction by attaching the power supply device to a surface of the support portion that faces the open surface, the power supply device is suspended above the upper surface of the light source board mounting plate to provide a gap therebetween, the light source board mounting plate has no heat dissipation fins in the gap; A lighting fixture characterized by:

2. the power supply device has a power supply board, The lighting fixture according to claim 1, characterized in that the power supply board is fixed to the surface of the support part facing the open surface inside the box-shaped support part so as to be spaced apart from the light source board mounting plate.

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