Power supply unit and lighting device

Abstract

To provide a power supply device unit which can inhibit increase of kinds of power supply devices, and to provide a lighting device.SOLUTION: A power supply device unit 1 includes: a power supply device 100; and a power supply cover 200. The power supply cover 200 is attached to the power supply device 100 so as to cover the power supply device 100. The power supply device 100 has: a power supply component 110; and a power supply case 120 which houses the power supply component 110. The power supply cover 200 has: a first cover part 210; a second cover part 220 facing the first cover part 210; and a third cover part 230 which connects the first cover part 210 with the second cover part 220. The power supply case 120 has a first case part 121, a second case part 122, and a third case part 123. A space S201 is formed in at least one of a space between the first case part 121 and the first cover part 210 and a space between the second case part 122 and the second cover part 220.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a power supply unit and a lighting device.

Background Art

[0002] Conventionally, an embedded lighting device such as a downlight has been known (see, for example, Patent Document 1). Patent Document 1 describes a lighting device including a lamp unit and a power supply unit electrically connected to the lamp unit. The lamp unit has an LED light source and a frame or the like that houses the LED light source. The lamp unit is disposed in an embedding hole provided in the ceiling. The power supply unit has a circuit board, a housing that houses the circuit board, and a terminal block. The power supply unit is disposed in the ceiling space and is screwed to the surface of the ceiling space. Heat generated on the circuit board is radiated into the atmosphere through the housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in recent years, a heat insulating material may be disposed in the ceiling space as heat insulation work. In this case, the power supply unit is disposed between the ceiling and the heat insulating material. That is, the power supply unit is covered with the heat insulating material. Therefore, the heat dissipation performance of the power supply unit deteriorates.

[0005] Therefore, as a power supply unit corresponding to heat insulation work, a power supply unit having a larger housing size than a normal power supply unit is known. In this power supply unit, by enlarging the internal space of the housing and radiating heat generated on the circuit board into the air in the internal space, it is possible to suppress a decrease in the heat dissipation performance of the power supply unit.

[0006] However, if two types of power supply units are needed to accommodate both insulated and uninsulated ceilings, it becomes necessary to manufacture two different units, complicating parts management. Furthermore, while the insulated power supply unit can also be used for uninsulated ceilings, its larger size compared to the uninsulated unit leads to increased manufacturing, management, and transportation costs.

[0007] The present invention has been made in view of the above problems, and the object of the present invention is to provide a power supply unit and a lighting device that can suppress the increase in the number of types of power supply devices. [Means for solving the problem]

[0008] The power supply unit disclosed herein is electrically connected to a lighting fixture. The power supply unit comprises a power supply and a power supply cover. The power supply cover is attached to the power supply so as to cover the power supply. The power supply has power supply components and a power supply case that houses the power supply components. The power supply cover has a first cover portion, a second cover portion facing the first cover portion, and a third cover portion connecting the first cover portion and the second cover portion. The power supply case has a first case portion facing the first cover portion, a second case portion facing the second cover portion, and a third case portion facing the third cover portion. A space is formed between the first case portion and the first cover portion, and between the second case portion and the second cover portion.

[0009] In the power supply unit disclosed herein, the power supply case further has a fixing portion that protrudes from the third case portion toward the third cover portion. The fixing portion is fixed to the third cover portion. A space is formed between the third case portion and the third cover portion.

[0010] In the power supply unit disclosed herein, the power supply cover has a first projection and a second projection. The first projection is located at the end of the first cover portion opposite to the third cover portion. The second projection is located at the end of the second cover portion opposite to the third cover portion. The first projection protrudes from the first cover portion toward the second cover portion. The second projection protrudes from the second cover portion toward the first cover portion.

[0011] In the power supply unit disclosed herein, the third cover portion connects the first cover portion and the second cover portion in a first direction. The power supply cover further has an inclined portion located at the end of the third cover portion in a second direction intersecting the first direction. The first cover portion and the second cover portion project from the third cover portion to one side in a third direction intersecting the first and second directions. The inclined portion is inclined toward one side in the third direction as it moves away from the third cover portion.

[0012] The power supply unit disclosed herein further comprises electric wires for electrically connecting the power supply unit and the lighting fixture. The power supply cover further comprises a retaining portion for holding the electric wires.

[0013] In the power supply unit disclosed herein, the power supply cover is detachable from the power supply unit.

[0014] The lighting device disclosed herein comprises the above-mentioned power supply unit and a lighting fixture electrically connected to the power supply unit. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a power supply unit and a lighting device that can suppress the need for a large number of different types of power supply devices. [Brief explanation of the drawing]

[0016] [Figure 1]It is a perspective view showing a power supply unit according to an embodiment of the present invention and a lighting device equipped with the lighting fixture from the +Z direction. [Figure 2] It is a cross-sectional view showing a state where a lighting device equipped with a power supply unit according to an embodiment of the present invention is arranged on a ceiling. [Figure 3] It is a perspective view showing the power supply of the power supply unit according to an embodiment of the present invention. [Figure 4] It is a cross-sectional view showing the power supply of the power supply unit according to an embodiment of the present invention. [Figure 5] It is a cross-sectional view showing the power supply unit according to an embodiment of the present invention. [Figure 6] It is a perspective view showing the power supply unit according to an embodiment of the present invention. [Figure 7] It is a bottom view showing the power supply unit according to an embodiment of the present invention from one side C1 in the C direction. [Figure 8] It is a plan view showing the power cover of the power supply unit according to an embodiment of the present invention. [Figure 9] It is a cross-sectional view for explaining a method of installing a lighting device on a ceiling. [Figure 10] It is a cross-sectional view showing a state where the power supply unit is arranged between a ceiling and glass wool. [Figure 11] It is a cross-sectional view showing the structure of the power supply unit according to the first modification example of the present invention. [Figure 12] It is a cross-sectional view showing the structure of the power supply unit according to the second modification example of the present invention. [Figure 13] It is a cross-sectional view showing the structure of the power supply unit according to the third modification example of the present invention. [Figure 14] It is a cross-sectional view showing the structure of the power supply unit according to the fourth modification example of the present invention. [Figure 15] It is a cross-sectional view showing the structure of the power supply unit according to the fifth modification example of the present invention. [Figure 16] It is a perspective view showing the structure of the power cover of the power supply unit according to the sixth modification example of the present invention.

Embodiments for Carrying Out the Invention

[0017] Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and will not be repeated in the description. Also, the Z-axis is shown in the drawings as appropriate for ease of understanding. As an example, the Z-axis is parallel to the vertical direction. The positive direction of the Z-axis indicates the vertically upward direction, and the negative direction of the Z-axis indicates the vertically downward direction.

[0018] Referring to Figures 1 to 10, a lighting device 500 equipped with a power supply unit 1 according to an embodiment of the present invention will be described. Figure 1 is a perspective view of the lighting device 500, equipped with a power supply unit 1 and a lighting fixture 300 according to an embodiment of the present invention, taken from the +Z direction (here, from above). Figure 2 is a cross-sectional view showing the lighting device 500, equipped with a power supply unit 1 and a lighting fixture 300 according to an embodiment of the present invention, installed on a ceiling 1000.

[0019] As shown in Figures 1 and 2, the lighting device 500 is, for example, a recessed lighting device embedded in the ceiling or wall. In this embodiment, the lighting device 500 is a downlight embedded in the ceiling 1000. In this embodiment, glass wool 1100 is arranged over substantially the entire upper surface of the ceiling 1000.

[0020] The lighting device 500 comprises a power supply unit 1 and a lighting fixture 300 that is electrically connected to the power supply unit 1.

[0021] The lighting fixture 300 includes a light source (not shown), a reflective member 302 that surrounds the light source, a mounting member (not shown), and a heat dissipation member 304. The light source (not shown) has, for example, an LED element. The reflective member 302 has a reflective surface (not shown) that reflects light emitted from the light source in the -Z direction (downward in this case). The mounting member (not shown) is a member for attaching the lighting fixture 300 to the opening 1000a of the ceiling 1000. The mounting member (not shown) may be, for example, a leaf spring that engages with the periphery of the opening 1000a. The heat dissipation member 304 is attached to the reflective member 302. The heat dissipation member 304 dissipates heat generated by the light source. The heat dissipation member 304 has, for example, a plurality of heat dissipation fins.

[0022] The power supply unit 1 is positioned on the ceiling 1000. In this embodiment, the power supply unit 1 is positioned between the ceiling 1000 and the glass wool 1100. The power supply unit 1 comprises a power supply 100 and a power supply cover 200.

[0023] Figure 3 is a perspective view showing the power supply unit 100 of the power supply unit 1 of this embodiment. Figure 4 is a cross-sectional view showing the power supply unit 100 of the power supply unit 1 of this embodiment. Figure 5 is a cross-sectional view showing the power supply unit 1 of this embodiment. Note that in Figures 3 and 4, the power supply unit 100 is shown inverted in the Z-axis direction compared to Figures 1 and 2.

[0024] As shown in Figures 3 and 4, the power supply unit 100 includes a power supply component 110 and a power supply case 120 that houses the power supply component 110. The power supply component 110 converts, for example, alternating current supplied from a commercial power source into direct current. The power supply component 110 includes, for example, a circuit board 111. The circuit board 111 has a substantially rectangular shape extending in direction B. Direction B refers to the longitudinal direction of the circuit board 111 and the longitudinal direction of the power supply unit 100. In this specification, one side of direction B is referred to as side B1, and the other side of direction B is referred to as side B2. Direction B is an example of the "second direction" of the present invention.

[0025] Furthermore, the power supply component 110 further includes, for example, a plurality of circuit components 112a, 112b, and 112c that constitute a power supply circuit. The circuit components 112a, 112b, and 112c are mounted on the circuit board 111.

[0026] As shown in Figures 3 and 5, the power supply case 120 has a first case section 121, a second case section 122, a third case section 123, and a fourth case section 124. The first case section 121 and the second case section 122 face each other in direction A. The first case section 121 and the second case section 122 are spaced apart from each other in direction A. Direction A is the direction that intersects with direction B. Direction A also represents the short-side direction of the circuit board 111 and the short-side direction of the power supply device 100. In this specification, one side of direction A is described as side A1, and the other side of direction A is described as side A2. Direction A is an example of the "first direction" of the present invention.

[0027] The third case portion 123 and the fourth case portion 124 face each other in the C direction. The third case portion 123 and the fourth case portion 124 are spaced apart from each other in the C direction. The C direction is the direction that intersects with the A direction and the B direction. The C direction also indicates the thickness direction of the circuit board 111. In this specification, one side of the C direction is described as side C1, and the other side of the C direction is described as side C2. Note that the C direction is an example of the "third direction" of the present invention. In this embodiment, the C direction is substantially parallel to the Z direction.

[0028] The third case section 123 is positioned to connect the ends of the first case section 121 and the second case section 122 on the other side C2 in the C direction. In other words, the third case section 123 is positioned across the first case section 121 and the second case section 122 on the other side C2 in the C direction. The fourth case section 124 is positioned to connect the ends of the first case section 121 and the second case section 122 on the one side C1 in the C direction. In other words, the fourth case section 124 is positioned across the first case section 121 and the second case section 122 on the one side C1 in the C direction.

[0029] In this embodiment, the first case portion 121, the second case portion 122, and the third case portion 123 are formed from a single member. Specifically, a member having the first case portion 121, the second case portion 122, and the third case portion 123 is formed by bending a single sheet of metal at predetermined positions. By attaching this member to the fourth case portion 124, a power supply case 120 having the first case portion 121, the second case portion 122, the third case portion 123, and the fourth case portion 124 is constructed. For example, the member having the first case portion 121, the second case portion 122, and the fourth case portion 124 may be attached to the third case portion 123. Alternatively, for example, a member having the first case portion 121, the second case portion 122, the third case portion 123, and the fourth case portion 124 may be formed by bending a single sheet of metal.

[0030] As shown in Figures 3 and 4, the power supply case 120 further comprises a fifth case section 125 and a sixth case section 126. The fifth case section 125 and the sixth case section 126 face each other. The fifth case section 125 and the sixth case section 126 are spaced apart from each other in direction B. The fifth case section 125 is located at one end B1 in direction B of the first to fourth case sections 121 to 4th case sections 124. The sixth case section 126 is located at the other end B2 in direction B of the first to fourth case sections 121 to 4th case sections 124.

[0031] The first case section 121, the second case section 122, the third case section 123, and the fourth case section 124 form a housing space S100 for housing the power supply component 110. In this embodiment, the first case section 121, the second case section 122, the third case section 123, the fourth case section 124, the fifth case section 125, and the sixth case section 126 form the housing space S100.

[0032] In this embodiment, the power supply component 110 is fixed to the third case portion 123. Specifically, the circuit board 111 is fixed to the portion 123a of the third case portion 123 that faces the housing space S100.

[0033] The first case section 121, the second case section 122, and the fourth case section 124 have approximately the same length in the direction B. On the other hand, the third case section 123 has a longer length in the direction B than the first case section 121, the second case section 122, and the fourth case section 124. Specifically, the third case section 123 has a protruding portion 123b that protrudes from one side B1 in the direction B than the fifth case section 125.

[0034] The power supply unit 1 further comprises a terminal block 10, a connector 20, and electric wires 30. The terminal block 10 is positioned on a protruding portion 123b of the third case portion 123. The terminal block 10 is electrically connected to the commercial power supply via power lines (not shown). The terminal block 10 is also electrically connected to the circuit board 111 via a cable 11 (see Figure 4). As a result, power is supplied from the commercial power supply to the power supply components 110 via the terminal block 10. The fifth case portion 125 has a cable opening 125a through which the cable 11 is inserted.

[0035] The connector 20 is located at the other end B2 in direction B of the circuit board 111. The connector 20 is electrically connected to the lighting fixture 300 (see Figure 1) via the electric wire 30. This allows power to be supplied from the power supply component 110 to the lighting fixture 300. The sixth case portion 126 has a wiring opening 126a through which the electric wire 30 is inserted.

[0036] The power supply case 120 further includes fixing parts 127 and 128 that protrude from the third case section 123. The fixing parts 127 and 128 protrude toward the opposite side (the other side C2 in direction C) from the first case section 121 and the second case section 122. In other words, the fixing parts 127 and 128 protrude from the third case section 123 toward the third cover section 230, which will be described later. In this embodiment, the fixing parts 127, 128 and the third case section 123 are formed from a single member, but the fixing parts 127 and 128 may be attached to the third case section 123.

[0037] Specifically, the fixing portion 127 is positioned at the end of one side B1 in the B direction of the third case portion 123. The fixing portion 127 is formed in a substantially L-shape. The fixing portion 127 has a first portion 127a that is substantially perpendicular to the third case portion 123, and a second portion 127b that extends from the first portion 127a to one side B1 in the B direction. In this embodiment, a screw insertion hole 127c is formed in the second portion 127b.

[0038] Furthermore, the fixing portion 128 is positioned at the other end B2 in the direction B of the third case portion 123. The fixing portion 128 is formed in a substantially L-shape. The fixing portion 128 has a first portion 128a that is substantially perpendicular to the third case portion 123, and a second portion 128b that extends from the first portion 128a to the other side B2 in the direction B. In this embodiment, a screw insertion hole 128c is formed in the second portion 128b.

[0039] Figure 6 is a perspective view showing the power supply unit 1 of this embodiment. Figure 7 is a bottom view showing the power supply unit 1 of this embodiment from one side C1 in direction C. Figure 8 is a plan view showing the power supply cover 200 of the power supply unit 1 of this embodiment.

[0040] As shown in Figures 5 to 7, the power supply cover 200 is attached to the power supply unit 100 so as to cover the power supply unit 100. In this embodiment, the power supply cover 200 is detachably attached to the power supply unit 100. The power supply cover 200 has a first cover portion 210, a second cover portion 220, and a third cover portion 230. The first cover portion 210 and the second cover portion 220 face each other. The first cover portion 210 and the second cover portion 220 are spaced apart from each other in direction A. The third cover portion 230 connects the other ends C2 of the first cover portion 210 and the second cover portion 220 in direction C.

[0041] The first cover portion 210 faces the first case portion 121 of the power supply case 120. The first cover portion 210 is positioned approximately parallel to the first case portion 121. The second cover portion 220 faces the second case portion 122 of the power supply case 120. The second cover portion 220 is positioned approximately parallel to the second case portion 122. The third cover portion 230 faces the third case portion 123 of the power supply case 120. The third cover portion 230 is positioned approximately parallel to the third case portion 123.

[0042] In this embodiment, the first cover portion 210, the second cover portion 220, and the third cover portion 230 are formed from a single component. Specifically, the power supply cover 200 is formed by bending a single sheet of metal at predetermined positions.

[0043] Here, a space S201 (see Figure 5) is formed between the first case portion 121 and the first cover portion 210, and between the second case portion 122 and the second cover portion 220. In this embodiment, the power supply unit 100 is positioned in the center of the power supply cover 200 in direction A. Therefore, a space S201 is formed both between the first case portion 121 and the first cover portion 210, and between the second case portion 122 and the second cover portion 220. In other words, the first cover portion 210 is separated from the first case portion 121, and the second cover portion 220 is separated from the second case portion 122.

[0044] The power supply cover 200 further includes a first projection 241 and a second projection 242. The first projection 241 is located at the end of the first cover portion 210 opposite to the third cover portion 230 (one side C1 in direction C). The first projection 241 protrudes from the first cover portion 210 toward the second cover portion 220. The second projection 242 is located at the end of the second cover portion 220 opposite to the third cover portion 230. The second projection 242 protrudes from the second cover portion 220 toward the first cover portion 210. In other words, the first projection 241 and the second projection 242 protrude from the first cover portion 210 and the second cover portion 220 so as to move closer to each other.

[0045] The first projection 241 has a screw insertion hole 241a. The screw insertion hole 241a is located at the other end B2 in the direction B of the first projection 241. The second projection 242 has a screw insertion hole 242a. The screw insertion hole 242a is located at the one end B1 in the direction B of the second projection 242. In other words, the screw insertion holes 241a and 242a are located on opposite sides of each other in the direction B. The screw insertion holes 241a and 242a are holes for screwing the power supply cover 200 to the upper surface (the surface on the back side of the ceiling) of the ceiling 1000.

[0046] The third cover portion 230 has notches 230a and 230b. Notches 230a and 230b are positioned to correspond to the screw insertion holes 241a and 242a, respectively. Specifically, as shown in Figures 6 and 8, notch 230a faces a predetermined area including the screw insertion hole 241a of the first protrusion 241. Notch 230b faces a predetermined area including the screw insertion hole 242a of the second protrusion 242. Therefore, when the power supply cover 200 is viewed from the other side C2 in direction C, the screw insertion hole 241a is visible through notch 230a, and the screw insertion hole 242a is visible through notch 230b.

[0047] Furthermore, the third cover portion 230 has a mounting hole 230c and a plurality of mounting holes 230d. The mounting hole 230c and the plurality of mounting holes 230d are holes for screwing the power supply unit 100 to the power supply cover 200. The mounting hole 230c and the plurality of mounting holes 230d are arranged in a substantially straight line in the center of the third cover portion 230 in direction A. The mounting hole 230c is located at the other end B2 in direction B of the third cover portion 230. The plurality of mounting holes 230d are located at a predetermined distance from the mounting hole 230c.

[0048] Here, the power supply cover 200 accommodates multiple types of power supply units 100. In other words, one type of power supply cover 200 is prepared for each of the multiple types of power supply units 100. The mounting hole 230c is a common hole, and regardless of which type of power supply unit 100 is attached to the power supply cover 200, one end of the power supply unit 100 is screwed in using the mounting hole 230c. On the other hand, the multiple mounting holes 230d are provided according to the length of the power supply unit 100 in the B direction. One of the multiple mounting holes 230d is selected according to the length of the power supply unit 100 in the B direction, and the other end of the power supply unit 100 is screwed into the selected mounting hole 230d.

[0049] The power supply cover 200 further has an inclined portion 250. The inclined portion 250 is located at one end B1 in the B direction of the third cover portion 230. The inclined portion 250 inclins toward one side C1 in the C direction as it moves away from the third cover portion 230. In this embodiment, the inclined portion 250 is inclined with respect to the third cover portion 230 by, for example, 30° or more and 60° or less. In addition, the corner portion of the inclined portion 250 opposite to the third cover portion 230 has an R shape. In other words, the corner portion of the inclined portion 250 furthest from the third cover portion 230 has an R shape.

[0050] As shown in Figure 5, in the power supply unit 1 of this embodiment, with the power supply 100 attached to the power supply cover 200, a space S202 is formed between the third case portion 123 and the third cover portion 230. In other words, the third case portion 123 is separated from the third cover portion 230. The third case portion 123 is separated from the third cover portion 230 by, for example, 5 mm or more and 20 mm or less.

[0051] Furthermore, with the power supply unit 100 attached to the power supply cover 200, a space is formed between the fourth case portion 124 and the virtual ceiling surface P1000. In other words, with the power supply unit 1 placed on the ceiling 1000, a space S203 is formed between the fourth case portion 124 and the ceiling 1000. The fourth case portion 124 is separated from the virtual ceiling surface P1000 by, for example, 5 mm or more and 20 mm or less. The virtual ceiling surface P1000 is a virtual surface that includes, for example, the outer surface of the first protrusion 241 and the outer surface of the second protrusion 242.

[0052] The power supply unit 1 of this embodiment is compatible with both cases where glass wool 1100 is placed on the ceiling 1000 (during insulation construction) and cases where glass wool 1100 is not placed on the ceiling 1000 (during non-insulated construction). Specifically, when glass wool 1100 is placed on the ceiling 1000, the power supply unit 1 with a power supply cover 200 attached to the power supply unit 100 is used. In this case, the power supply unit 1 is fixed to the upper surface of the ceiling 1000 using the screw insertion holes 241a and 242a of the power supply cover 200. Note that the power supply unit 1 may not be fixed to the ceiling 1000 but may be placed on the upper surface of the ceiling 1000.

[0053] On the other hand, if glass wool 1100 is not placed on the ceiling 1000, a power supply unit 1 without a power supply cover 200 attached to the power supply unit 100 is used. In this case, the power supply unit 100 is fixed to the upper surface of the ceiling 1000 using the screw insertion holes 127c and 128c of the power supply case 120. Note that the power supply unit 100 may not be fixed to the ceiling 1000, but may be placed on the upper surface of the ceiling 1000.

[0054] Thus, in this embodiment, the same power supply unit 100 can be used in both insulated and non-insulated construction cases, thus preventing an increase in the number of types of power supply units 100.

[0055] Furthermore, in this embodiment, as described above, the power cover 200 is detachably attached to the power supply unit 100. Therefore, even after the power cover 200 has been attached to the power supply unit 100, the power supply unit 100 can be removed from the power cover 200 and used in a non-insulated ceiling 1000.

[0056] Next, a method for installing the lighting device 500 on the ceiling 1000 will be described. Here, we will describe the case where glass wool 1100 is placed on the ceiling 1000. Figure 9 is a cross-sectional view illustrating the method for installing the lighting device 500 on the ceiling 1000. Figure 10 is a cross-sectional view showing the power supply unit 1 placed between the ceiling 1000 and the glass wool 1100.

[0057] As shown in Figure 9, when installing the lighting device 500 on the ceiling 1000, first, the power supply unit 1 is placed on the ceiling 1000. Specifically, the power supply unit 1 is inserted into the opening 1000a of the ceiling 1000 from one side B1 in direction B. Then, the power supply unit 1 pushes up the glass wool 1100 to create a gap between the ceiling 1000 and the glass wool 1100, and the power supply unit 1 is pushed between the ceiling 1000 and the glass wool 1100. At this time, the power supply cover 200 has an inclined portion 250 formed thereon, and since the inclined portion 250 makes surface contact with the glass wool 1100, it is possible to prevent the power supply cover 200 from getting caught on the glass wool 1100. This prevents a decrease in workability when placing the power supply unit 1 between the ceiling 1000 and the glass wool 1100, and also prevents damage to the glass wool 1100.

[0058] Next, the lighting fixture 300 is inserted into the opening 1000a of the ceiling 1000, and the lighting fixture 300 (see Figure 2) is attached to the ceiling 1000 using mounting members (not shown). Then, if necessary, the power cover 200 of the power supply unit 1 is screwed to the ceiling 1000.

[0059] As shown in Figure 10, with the power supply unit 1 positioned on the ceiling 1000, the top and sides of the power supply unit 1 are covered with glass wool 1100.

[0060] In this embodiment, as described above, a space S201 is formed between the first case portion 121 and the first cover portion 210, and between the second case portion 122 and the second cover portion 220. Therefore, the heat generated by the circuit board 111 can be dissipated into the space S201, thus suppressing a decrease in the heat dissipation performance of the power supply unit 100. Furthermore, in this embodiment, since a space S201 is formed both between the first case portion 121 and the first cover portion 210, and between the second case portion 122 and the second cover portion 220, a decrease in the heat dissipation performance of the power supply unit 100 can be further suppressed.

[0061] Furthermore, as described above, a space S202 is formed between the third case portion 123 and the third cover portion 230. Therefore, the heat generated on the circuit board 111 can be dissipated into the space S202, further suppressing a decrease in the heat dissipation performance of the power supply unit 100.

[0062] Furthermore, as described above, a space S203 is formed between the fourth case section 124 and the ceiling 1000. Therefore, the heat generated by the circuit board 111 can be dissipated into the space S203, which further suppresses the decrease in the heat dissipation performance of the power supply unit 100.

[0063] Furthermore, as described above, the first protrusion 241 of the power supply cover 200 protrudes from the first cover portion 210 toward the second cover portion 220. Also, the second protrusion 242 protrudes from the second cover portion 220 toward the first cover portion 210. Therefore, it is possible to suppress the increase in the outer dimensions of the power supply cover 200. Thus, it is possible to suppress the difficulty in inserting the power supply unit 1 into the opening 1000a of the ceiling 1000. In other words, even when the first protrusion 241 and the second protrusion 242 are provided, it is not necessary to shorten the distance between the first cover portion 210 and the second cover portion 220, so it is possible to suppress the narrowing of the space S201.

[0064] Next, a modified power supply unit 1 according to the present invention will be described with reference to Figures 11 to 16.

[0065] Figure 11 is a cross-sectional view showing the structure of a power supply unit 1 according to a first modification of the present invention. As shown in Figure 11, in the power supply unit 1 of the first modification, portion 129a, which corresponds to the fourth case portion 124 of the above embodiment, faces the third cover portion 230 of the power supply cover 200. In the first modification, portion 129a is the third case portion 123. Also, portion 129b, which corresponds to the third case portion 123 of the above embodiment, is the fourth case portion 124. In the third modification, for example, portion 129a may be fixed to the third cover portion 230 of the power supply cover 200.

[0066] Figure 12 is a cross-sectional view showing the structure of a power supply unit 1 according to a second modification of the present invention. As shown in Figure 12, in the power supply unit 1 of the second modification, unlike the above embodiment, a space S201 is formed only between the first case portion 121 and the first cover portion 210, and only between the second case portion 122 and the second cover portion 220. In this case, as with the above embodiment, the power supply case 120 may be fixed to the third cover portion 230 of the power supply cover 200. Alternatively, for example, the first case portion 121 of the power supply case 120 may be fixed to the first cover portion 210 of the power supply cover 200.

[0067] Figure 13 is a cross-sectional view showing the structure of a power supply unit 1 according to a third modification of the present invention. As shown in Figure 13, in the power supply unit 1 of the third modification, unlike the above embodiment, space S203 is narrower than space S202. Specifically, the fourth case portion 124 is separated from the virtual ceiling surface P1000 by, for example, a few millimeters.

[0068] Figure 14 is a cross-sectional view showing the structure of a power supply unit 1 according to a fourth modification of the present invention. As shown in Figure 14, in the power supply unit 1 of the fourth modification, unlike the above embodiment, the power supply cover 200 has a fourth cover portion 240. The power supply cover 200 is formed in a cylindrical shape by a first cover portion 210, a second cover portion 220, a third cover portion 230 and a fourth cover portion 240. The fourth cover portion 240 faces the fourth case portion 124 of the power supply case 120. The fourth cover portion 240 may, for example, connect the first cover portion 210 and the second cover portion 220.

[0069] Figure 15 is a cross-sectional view showing the structure of a power supply unit 1 according to a fifth modification of the present invention. As shown in Figure 15, in the power supply unit 1 of the fifth modification, unlike the above embodiment, the first protrusion 241 and the second protrusion 242 protrude from the first cover portion 210 and the second cover portion 220 so as to be away from each other. Specifically, the first protrusion 241 protrudes from the first cover portion 210 toward the opposite side of the second cover portion 220 (one side A1 in direction A). The second protrusion 242 protrudes from the second cover portion 220 toward the opposite side of the first cover portion 210 (the other side A2 in direction A). In the power supply unit 1 of the fifth modification, in order to prevent the power supply cover 200 from contacting the periphery of the opening 1000a of the ceiling 1000, the length of the third cover portion 230 in direction A is shorter than the length of the third cover portion 230 in direction A in the above embodiment.

[0070] Figure 16 is a perspective view showing the structure of the power supply cover 200 of the power supply unit 1 according to a sixth modification of the present invention. As shown in Figure 16, in the power supply unit 1 according to the sixth modification, unlike the above embodiment, the power supply cover 200 further has a holding portion 260 for holding the electric wire 30 (see Figure 1). The holding portion 260 is, for example, located at the end of the third cover portion 230 in direction B. The holding portion 260 has, for example, an insertion hole 260a through which the electric wire 30 is inserted. In the sixth modification, by providing the holding portion 260 on the power supply cover 200, it is possible to suppress the load on the connection portion between the electric wire 30 and the connector 20 when, for example, the electric wire 30 is pulled.

[0071] Embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention. The drawings schematically show each component in order to facilitate understanding, and the thickness, length, number, etc. of each component shown may differ from the actual dimensions due to the convenience of drawing creation. Furthermore, the material, shape, dimensions, etc. of each component shown in the above embodiments are examples and are not particularly limited, and various modifications are possible without substantially departing from the effects of the present invention.

[0072] For example, in the above embodiment, the power supply cover 200 is shown as being detachably attached to the power supply unit 100, but the present invention is not limited to this. For example, the power supply cover 200 may be attached to the power supply unit 100 by welding or the like. In other words, the power supply cover 200 may be fixed to the power supply unit 100 in a way that prevents removal.

[0073] Furthermore, although the above embodiment shows an example in which the power supply cover 200 has an inclined portion 250, the present invention is not limited to this, and the power supply cover 200 does not need to have an inclined portion 250.

[0074] Furthermore, while the third modified example shows a case where space S203 is narrower than space S202, the present invention is not limited to this. For example, the fourth case portion 124 may be arranged flush with the outer surfaces of the first protrusion 241 and the second protrusion 242. In other words, space S203 does not need to be formed between the fourth case portion 124 and the ceiling 1000 (virtual ceiling surface P1000).

[0075] Furthermore, while the sixth modification shows an example in which the power supply cover 200 has a holding portion 260 for holding the electric wire 30, the present invention is not limited to this. For example, the power supply cover 200 may have a holding portion for holding a power supply wire (not shown). The power supply wire (not shown) is an electric wire that supplies power from the commercial power supply to the power supply device 100.

[0076] Furthermore, although the above embodiment shows an example in which the circuit board 111 is attached to the third case portion 123, the present invention is not limited to this. For example, the circuit board 111 may be attached to the fourth case portion 124.

[0077] Furthermore, although the above embodiment shows an example in which the lighting device 500 is placed on the ceiling, the present invention is not limited to this. For example, the lighting device 500 may be placed on a side wall. [Industrial applicability]

[0078] This invention is useful in the fields of power supply units and lighting devices. [Explanation of symbols]

[0079] 1: Power supply unit 30: Electric wire 100: Power supply 110: Power supply components 111: Circuit board (power supply components) 112a, 112b, 112c: Circuit components (power supply components) 120: Power supply case 121: Case Section 1 122: Case Section 2 123: Third Case Section 127, 128: Fixed part 200: Power supply cover 210: First cover section 220: Second Cover Section 230: Third Cover Section 241: 1st protrusion 242:Second protrusion 250: Inclined part 260: Holding part 300: Lighting fixtures 500: Lighting device S201, S202: Space

Claims

1. A power supply unit that is electrically connected to a lighting fixture, Power supply unit, A power cover attached to the power supply so as to cover the power supply unit, Equipped with, The power supply unit comprises a power supply component and a power supply case that houses the power supply component. The first, second, and third directions are directions that intersect each other. The power supply cover has a first cover portion, a second cover portion facing the first cover portion in the first direction, and a third cover portion connecting the first cover portion and the second cover portion. The power supply case has a first case portion facing the first cover portion, a second case portion facing the second cover portion, and a third case portion facing the third cover portion in the third direction. A power supply unit in which a space is formed between the first case portion and the first cover portion, and between the second case portion and the second cover portion, and both ends of the power supply cover in the second direction are open, and the first cover portion, second cover portion and third cover portion of the power supply cover are configured to cover the power supply case.

2. The power supply case further has a fixing portion that protrudes from the third case portion toward the third cover portion, The aforementioned fixing part is fixed to the third cover part, A space is formed between the third case portion and the third cover portion, as described in claim 1.

3. The power supply cover has a first projection located at the end of the first cover portion opposite to the third cover portion, and a second projection located at the end of the second cover portion opposite to the third cover portion. The first protrusion extends from the first cover portion toward the second cover portion, The power supply unit according to claim 1 or claim 2, wherein the second protrusion protrudes from the second cover portion toward the first cover portion.

4. The third cover portion connects the first cover portion and the second cover portion in the first direction, The power supply cover further has an inclined portion located at the end of the third cover portion in the second direction, The first cover portion and the second cover portion protrude from the third cover portion to one side in the first direction and the third direction, The power supply unit according to claim 1 or claim 2, wherein the inclined portion is inclined toward one side in the third direction as it moves away from the third cover portion.

5. The power supply unit and the lighting fixture are further provided with electric wires for electrical connection. The power supply unit according to claim 1 or claim 2, wherein the power supply cover further has a holding portion for holding the electric wires.

6. The power supply cover is detachable from the power supply unit according to claim 1 or claim 2.

7. The power supply unit according to claim 1, A lighting fixture electrically connected to the power supply unit and A lighting device equipped with the following features.

Images