Lighting device

Abstract

To efficiently dissipate heat with a simple structure.SOLUTION: An illuminating device 1 comprises a light source part 110 for emitting light, a power source unit U1 for supplying power to the light source part 110, a case 10b housing the power source unit U1, and a pair of power supply terminal parts 30 for supplying external power to the power source unit U1. The case 10b includes: a cylindrical cylinder part 22; an end surface part 20a located on the side of one end of the cylinder part 22; a protruding part 20 protruding from a front surface of the end surface part 20a out of the front surface and a back surface; a wall part 23 arranged inside the cylinder part 22, and erected on the back surface of the end surface part 20a; and a connecting part 24 connecting the cylinder part 22 and the wall part 23. The pair of power supply terminal parts 30 are opposed to each other via the protruding part 20, and protrude with respect to the case 10b. At least the cylinder part 22, the wall part 23, and the connecting part 24 are made of metal. The power source unit U1 is opposed to the wall part 23. The light source part 110 is arranged on the side of the other end of the cylinder part 22, and is in contact with the wall part 23.SELECTED DRAWING: Figure 14

Description

TECHNICAL FIELD

[0001] The present invention relates to a lighting device. BACKGROUND ART

[0002] The lighting device of Patent Document 1 includes a light-emitting module disposed inside the lighting device main body, a heat dissipating body having a light-emitting module connection portion to which the light-emitting module is connected in a heat-conductive manner, and an insulating heat conductive sheet interposed between the light-emitting module connection portion and the light-emitting module. PRIOR ART DOCUMENTS PATENT DOCUMENTS

[0003] PATENT DOCUMENT 1 Japanese Unexamined Patent Application Publication No. 2015-79644 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] As in the lighting device of Patent Document 1, dedicated members such as a heat dissipating body and a heat conductive sheet are disposed in order to dissipate heat generated in the lighting device. As a result, the structure tends to be complicated, making assembly difficult, while the number of components increases and the manufacturing cost rises.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a lighting device capable of efficiently dissipating heat with a simple configuration. MEANS FOR SOLVING THE PROBLEMS

[0006] The lighting device disclosed herein comprises a light source unit, a power supply unit, a housing, and a pair of power supply terminals. The light source unit emits light. The power supply unit supplies power to the light source unit. The housing houses the power supply unit. The pair of power supply terminals supply external power to the power supply unit. The housing includes a cylindrical portion, an end face portion, a protruding portion, a wall portion, and a connecting portion. The cylindrical portion is cylindrical in shape. The end face portion is located at one end of the cylindrical portion. The protruding portion protrudes from the surface of the end face portion, rather than the surface or back surface. The wall portion is located inside the cylindrical portion and is erected on the back surface of the end face portion. The connecting portion connects the cylindrical portion and the wall portion. The pair of power supply terminals face each other via the protruding portion and protrude from the housing. At least the cylindrical portion, the wall portion, and the connecting portion are made of metal. The power supply unit faces the wall portion. The light source is positioned at the other end of the cylindrical portion and is in contact with the wall portion.

[0007] In the lighting device disclosed herein, the light source unit preferably includes a plurality of light-emitting elements and a substrate on which the plurality of light-emitting elements are arranged and which covers the wall. Preferably, at least some of the plurality of light-emitting elements face the wall or the connection portion via the substrate. [Effects of the Invention]

[0008] According to the present invention, it is possible to efficiently dissipate heat with a simple configuration. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing a lighting device according to an embodiment of the present invention. [Figure 2] Another perspective view showing the lighting device. [Figure 3] This is a perspective view showing a socket. [Figure 4] This is a block diagram of a light source unit. [Figure 5] This is a cross-sectional view showing a lighting device attached to a lighting mounting section. [Figure 6] This is a diagram showing the power storage section in a state where the power supply unit is not stored. [Figure 7] This is a diagram showing the attachment of the power supply unit to the power storage section. [Figure 8] This is a diagram showing the power storage section in a state where the power supply unit is stored. [Figure 9] This is a diagram showing the electrical connection between the power supply unit and the pair of power supply terminal sections. [Figure 10] This is a perspective view showing the attachment of the power supply unit to the housing. [Figure 11] This is a perspective view from another angle showing the attachment of the power supply unit to the housing. [Figure 12] This is a diagram showing the housing to which the power supply unit is attached. [Figure 13] This is a cross-sectional view of the housing section. [Figure 14] This is a diagram showing the attachment of the light source section to the housing. [Figure 15] This is a diagram showing an example of the light source section attached to the housing. [Figure 16] This is a diagram showing another example of the light source section attached to the housing. [Figure 17] This is a diagram showing the lighting apparatus in a state where the housing section and the light source cover are separated. [Figure 18] This is a cross-sectional view showing the housing section in a state where the light source cover is attached. [Mode for Carrying Out the Invention]

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that, in the drawings, the same or corresponding parts are denoted by the same reference numerals, and repeated description thereof will not be made. In addition, for ease of understanding, the X-axis, Y-axis, and Z-axis of a three-dimensional orthogonal coordinate system are appropriately described in the drawings. As an example, the X-axis and the Y-axis are substantially parallel to the horizontal plane, and the Z-axis is substantially parallel to the vertical direction.

[0011] With reference to Figures 1 to 4, a lighting device 1 according to an embodiment of the present invention will be described. Figure 1 is a perspective view showing the lighting device 1 according to the embodiment of the present invention. As shown in Figure 1, the lighting device 1 emits light. The lighting device 1 is attachable to and detachable from a lighting fixture main body. The lighting fixture main body is mounted to a lighting mounting portion of a structure. The lighting fixture main body is, for example, a downlight, a bracket light, a spotlight, or the like. The lighting mounting portion is, for example, a ceiling or a wall.

[0012] Specifically, the lighting device 1 includes a light source unit 100. The light source unit 100 emits light. The light source unit 100 includes a light source section 110 (such as in Figure 5 and Figure 14), a power supply section 120 (such as in Figure 5 and Figure 7), a housing section 10, and a light source cover 11. The light source cover 11 includes a protruding section 12. The protruding section 12 protrudes outward from the light source cover 11. The light source section 110 emits light. The light source section 110 is disposed inside the substantially cylindrical housing section 10. The power supply section 120 supplies electric power to the light source section 110. The light source cover 11 covers the light source section 110. The light source cover 11 is disposed at an end of the housing section 10 in the first direction D1. The first direction D1 indicates a direction substantially perpendicular to the lighting mounting portion such as a ceiling. For example, the first direction D1 is substantially parallel to the vertical direction. Details of the light source section 110, the power supply section 120, the housing section 10, the light source cover 11, and the protruding section 12 will be described later.

[0013] In Figure 1, for convenience of explanation, a center line AX is illustrated. The center line AX is an imaginary line passing through the center of the light source unit 100 (housing section 10). The center line AX is substantially orthogonal to the light source cover 11. Hereinafter, the direction orthogonal to the center line AX is referred to as "radial direction RD". The "radial direction RD" may be any direction as long as it is a direction orthogonal to the center line AX, and is not particularly limited. In addition, the direction along the arc centered on the center line AX is referred to as "circumferential direction CD". The first direction D1 is, for example, substantially parallel to the center line AX.

[0014] Figure 2 is another perspective view showing the lighting device 1. As shown in Figure 2, the light source unit 100 has a power supply housing 10a and a housing 10b. In other words, the power supply housing 10a and the housing 10b constitute the housing 10. The power supply housing 10a houses the power supply unit 120. In this embodiment, the power supply housing 10a with the power supply unit 120 housed in it constitutes the power supply unit U1. The housing 10b houses the power supply housing 10a.

[0015] The light source unit 100 further includes a pair of power supply terminals 30. The housing 10b includes a cylindrical portion 22, an end face portion 20a, and a protruding portion 20. The cylindrical portion 22 has, for example, a substantially cylindrical shape. The end face portion 20a is located at one end of the cylindrical portion 22. Specifically, the end face portion 20a is positioned at the end of the cylindrical portion 22 in a second direction D2. The second direction D2 is the opposite direction to the first direction D1. The second direction D2 is, for example, substantially parallel to the vertical. The second direction D2 is, for example, substantially parallel to the center line AX. The end face portion 20a has, for example, a substantially annular shape or a substantially disc shape.

[0016] The protruding portion 20 projects in the second direction D2 from the surface of the end face portion 20a on the second direction D2 side. The protruding portion 20 has, for example, a substantially covered cylindrical shape or a substantially cylindrical shape. In the light source unit 100, the power supply housing portion 10a is exposed from the end face portion 20a and a part of the protruding portion 20. For example, the power supply housing portion 10a includes two pairs of exposed portions R1 and R2. The pair of exposed portions R1 are exposed from the end face portion 20a and a part of the protruding portion 20. The pair of exposed portions R2 are exposed from a part of the protruding portion 20. The pair of exposed portions R1 and the pair of exposed portions R2 are positioned offset from each other in the circumferential direction CD.

[0017] A pair of power supply terminals 30 supply external power to the power supply unit 120. Specifically, the pair of power supply terminals 30 are conductive members for supplying power to the light source unit 100. The pair of power supply terminals 30 are arranged in the power supply housing 10a. Specifically, each of the pair of power supply terminals 30 protrudes in a second direction D2 from each of the pair of exposed parts R1 of the power supply housing 10a. That is, each of the pair of exposed parts R1 is formed of an electrically insulating material such as synthetic resin and is located around each of the pair of power supply terminals 30. This ensures an electrical insulation distance between the pair of power supply terminals 30. The pair of power supply terminals 30 face each other via the protruding parts 20. Specifically, the pair of power supply terminals 30 face each other in the radial direction RD via the protruding parts 20. In cross-sectional view, the power supply terminals 30 have a substantially T-shape. The power supply terminals 30 are made of metal and are conductive.

[0018] Specifically, each of the pair of power supply terminals 30 has a first cylindrical portion 30a and a second cylindrical portion 30b. The first cylindrical portion 30a extends along a first direction D1. The first cylindrical portion 30a has a substantially cylindrical shape. The first cylindrical portion 30a protrudes from the end face portion 20a in a second direction D2. The second cylindrical portion 30b extends from the end of the first cylindrical portion 30a in the second direction D2 in a direction substantially parallel to the radial direction RD. The second cylindrical portion 30b has a substantially cylindrical shape.

[0019] Furthermore, the power supply housing 10a has a pair of first engaging portions 21. The pair of first engaging portions 21 are arranged on a pair of exposed portions R2. Figure 2 shows one of the pair of first engaging portions 21. The pair of first engaging portions 21 face each other in the radial direction RD. The first engaging portion 21 is a recess that is recessed radially RD inward from the circumferential surface of the protruding portion 20. The first engaging portion 21 has, for example, a substantially L-shape.

[0020] The protruding portion 20, the end face portion 20a, and the pair of power supply terminal portions 30 constitute the base portion 40 of the light source unit 100. The base portion 40 is, for example, a GX53 type or a GH76p type.

[0021] Furthermore, the projection 12 protrudes from the surface of the light source cover 11 on the first direction D1 side toward the first direction D1.

[0022] Next, the socket 50 of the lighting device 1 will be described with reference to Figure 3. Figure 3 is a perspective view showing the socket 50. As shown in Figure 3, the lighting device 1 further comprises the socket 50. The light source unit 100 (Figure 2) is mounted in the socket 50. Specifically, a pair of power supply terminals 30 (Figure 2) of the light source unit 100 are connected to the socket 50.

[0023] The socket 50 includes a socket body 51, a through hole 52, a pair of connection holes 53, a pair of second engagement parts 54, and a pair of terminals (not shown). The pair of terminals are each positioned corresponding to the pair of connection holes 53.

[0024] The socket body 51 has a roughly annular shape. The socket body 51 is made of an insulating resin material such as PBT. The insertion hole 52 penetrates the socket body 51 along the center line AX. The protruding portion 20 (Figure 2) of the light source unit 100 is inserted through the insertion hole 52.

[0025] The socket body 51 has a base plate 55. The base plate 55 is located on the first direction D1 side of the socket body 51. A pair of connection holes 53 are provided in the base plate 55. The pair of connection holes 53 face each other in the radial direction RD. The pair of connection holes 53 are rotationally symmetric with respect to the center line AX. Inside each connection hole 53, a terminal is arranged to which the power supply terminal portion 30 (Figure 2), which is inserted into the connection hole 53, is electrically connected.

[0026] Specifically, each connection hole 53 has an elongated hole 56 and a circular hole 57. The elongated hole 56 extends along the circumferential direction CD and is substantially arc-shaped. The circular hole 57 is located at one end of the elongated hole 56 in the circumferential direction CD. The second cylindrical portion 30b (Figure 2) of the power supply terminal portion 30 can be inserted through the circular hole 57. The first cylindrical portion 30a (Figure 2) of the power supply terminal portion 30 can be inserted through the elongated hole 56, but the second cylindrical portion 30b (Figure 2) cannot be inserted through it.

[0027] Furthermore, a pair of second engaging portions 54 are provided on the inner circumferential surface of the socket body 51. Each second engaging portion 54 protrudes radially inward RD. The pair of second engaging portions 54 face each other radially RD. The second engaging portions 54 are positioned offset in the circumferential CD relative to the connection hole 53.

[0028] Next, the method of attaching the light source unit 100 to the socket 50 will be explained with reference to Figures 2 and 3. First, the power supply terminal portion 30 of the light source unit 100 is inserted into the circular hole 57 of the socket 50. Then, the light source unit 100 is rotated in one direction in the circumferential direction CD. In this case, the power supply terminal portion 30 of the light source unit 100 rotates along the elongated hole 56 of the socket 50, and the first engaging portion 21 of the light source unit 100 engages with the second engaging portion 54 of the socket 50. As a result, the power supply terminal portion 30 is connected to the terminal of the socket 50, and the light source unit 100 is supported by the second engaging portion 54 of the socket 50. In other words, the light source unit 100 is attached to the socket 50.

[0029] Next, the electrical configuration of the light source unit 100 will be described with reference to Figure 4. Figure 4 is a block diagram of the light source unit 100. As shown in Figure 4, the light source unit 100 is connected to an external AC power source A via an external switch S. The light source unit 100 lights up based on the AC power source A.

[0030] With the light source unit 100 mounted in the socket 50, power is supplied from the AC power source A to the power supply unit 120 through the terminals of the socket 50 and the power supply terminals 30 of the light source unit 100. As a result, power is supplied from the power supply unit 120 to the light source unit 110, causing the light source unit 110 to light up.

[0031] The external switch S is, for example, a wall switch. By switching the external switch S, the light source unit 100 can be switched on and off. Specifically, when the external switch S is turned on, power from the AC power supply A is supplied to the light source unit 100, and the light source unit 100 lights up. In this case, more specifically, power from the AC power supply A is supplied to the light source unit 100 via a pair of power supply terminals 30 (Figure 2). When the external switch S is turned off, the power supplied from the AC power supply A to the light source unit 100 is cut off, and the light source unit 100 turns off. The external switch S may also be a dimmer or a lighting controller. The dimmer is, for example, a phase dimmer that adjusts the conduction angle of the AC current supplied from the AC power supply A to dim the light source unit 110. The lighting controller has, for example, a function to group multiple light source units 100 and turn them on or off, and a function to allow the user to turn the light source unit 100 on or off at a desired time.

[0032] In detail, the light source unit 110 includes one or more light-emitting elemental diodes (LDs) and a substrate 130 (Figures 5 and 14, etc.). The light-emitting elemental diode (LD) is, for example, an LED (Light Emitting Diode). In this case, for example, the light source unit 110 is an SMD (surface mount device) element or a COB (chip on board) element. When the light source unit 110 includes multiple light-emitting elemental diodes (LDs), the light colors of the multiple light-emitting elemental diodes may be different or the same. Also, the brightness of the multiple light-emitting elemental diodes (LDs) may be different or the same. The brightness of the light source unit 110 may be variable. For example, the light source unit 110 in this embodiment includes two types of light-emitting elemental diodes (LDs) with different light-emitting colors. When lit, one of the two light-emitting elemental diodes (LD) emits light with a high correlated color temperature, for example. When lit, the other light-emitting elemental diode (LD) emits light with a low correlated color temperature, for example.

[0033] The substrate 130 has, for example, a roughly circular disc shape. The light source unit 110 is arranged on the substrate 130. Specifically, each light-emitting element LD of the light source unit 110 is arranged on the mounting surface of the substrate 130. The substrate 130 is, for example, a thermally conductive substrate such as an aluminum substrate (MCPCB). The substrate 130 may also be an insulating substrate such as a resin.

[0034] The power supply unit 120 supplies power to the light source unit 110 based on the AC power supply A in response to the operation of the external switch S. For example, the power supply unit 120 includes power supply elements such as a converter, capacitor, and resistor, and a power supply board 125 (Figures 5 and 7, etc.) on which the power supply elements are mounted. The power supply elements convert the AC voltage supplied from the AC power supply A into a DC voltage and supply a constant current to each light source unit 110.

[0035] Next, the mounting of the lighting device 1 to the lighting mounting section RF will be described with reference to Figures 4 and 5. Figure 5 is a cross-sectional view showing the lighting device 1 mounted on the lighting mounting section RF. As shown in Figure 5, the lighting device 1 is mounted on the lighting mounting section RF. For example, the lighting mounting section RF is the ceiling. The ceiling may be horizontal or inclined relative to the horizontal. Specifically, the lighting mounting section RF has a mounting hole HL. The lighting device 1 is then mounted on the mounting hole HL.

[0036] As shown in Figure 5, the lighting device 1 comprises a socket 50, a case 70, and a plurality of mounting members 71. The socket 50 is mounted inside the case 70. A light source unit 100 is mounted on the socket 50. In the example shown in Figure 5, the case 70 has a substantially covered cylindrical shape. A plurality of mounting members 71 are fixed to the outer circumferential surface of the case 70. The mounting members 71 are, for example, leaf springs. The case 70 is then attached to the lighting mounting section RF by the elastic force of the plurality of mounting members 71. In this embodiment, when the light source unit 100 is mounted on the socket 50, it is preferable to have a space F1 between the bottom surface of the case 70 and the housing portion 10 of the light source unit 100. By providing a space F1, the ventilation between the case 70 and the light source unit 100 is improved, and the temperature rise of the light source unit 100 can be suppressed.

[0037] On the other hand, when removing the light source unit 100 from the socket 50, the light source unit 100 is rotated in the opposite direction to one direction of the circumferential direction CD. As shown in Figure 5, when the light source unit 100 is mounted on the socket 50, if the end face of the case 70 on the first direction D1 side is located on the second direction D2 side of the end face of the light source unit 100 on the first direction D1 side, then if the projection 12 is positioned on the surface of the light source cover 11 on the first direction D1 side, the worker removing the light source unit 100 will have an easier time gripping the projection 12, making it easier to rotate the light source unit 100 relative to the socket 50.

[0038] [Power supply unit] Next, the power supply unit U1 will be described with reference to Figures 6 to 9. Figures 6 to 9 show how to assemble the power supply unit U1. Figure 6 shows the power supply housing 10a without the power supply unit 120 housed inside. Figure 7 shows the power supply unit 120 being installed in the power supply housing 10a. Figure 8 shows the power supply housing 10a with the power supply unit 120 housed inside. Figure 9 shows the electrical connection between the power supply unit 120 and the pair of power supply terminals 30.

[0039] Figure 6 shows the interior of the power supply housing 10a. Specifically, Figure 6 shows the power supply housing 10a viewed in the second direction D2 shown in Figures 1, 2, and 5. The power supply housing 10a is made of synthetic resin such as acrylic (PMMA) or polycarbonate (PC). The power supply housing 10a has a power supply arrangement section 10a1 and two power supply terminal arrangement sections 10a2. The power supply arrangement section 10a1 has a power supply arrangement surface section S1, two protrusions 101A and 101B, and a power supply housing wall section W1. The power supply arrangement surface section S1 has a substantially disc shape. The power supply unit 120 is arranged on the power supply arrangement surface section S1. The two protrusions 101A and 101B face each other via the power supply arrangement surface section S1 and protrude outward from the power supply arrangement surface section S1. The power supply housing wall W1 is a wall that extends vertically from the outer periphery of the power supply placement surface S1 and the two protrusions 101A and 101B toward the side where the power supply unit 120 is located.

[0040] A pair of exposed portions R2 and a first engaging portion 21 are arranged on the outer surface of the power supply housing wall portion W1, which extends vertically from the two protrusions 101A and 101B.

[0041] On the other hand, each of the two power supply terminal arrangement sections 10a2 has a terminal arrangement surface section S2 and a terminal housing wall section W2. The terminal arrangement surface section S2 has a substantially rectangular flat plate shape. One of the pair of power supply terminal sections 30 is arranged on the terminal arrangement surface section S2. The two terminal arrangement surface sections S2 are located offset from the power supply arrangement surface section S1 in the direction in which the power supply housing wall section W1 extends, and face each other in directions different from the opposing directions of the two protrusions 101A and 101B via the power supply arrangement section 10a1, and protrude outward from the power supply arrangement section 10a1. The terminal housing wall section W2 is a wall that extends from the outer periphery of the terminal arrangement surface section S2 in three directions other than the power supply arrangement section 10a1 side, in the direction in which the power supply housing wall section W1 extends.

[0042] The power supply housing 10a further includes a projection 102, two support parts 104A and 104B, and four restricting parts 105. The support parts 104A and 104B support the power supply unit 120. The restricting parts 105 restrict the movement of the power supply unit 120.

[0043] The projection 102 protrudes from the outer surface of the power supply housing wall W1 toward the outside of the power supply housing 10a. Also, for example, the projection 102 extends along the direction in which the power supply housing wall W1 extends.

[0044] The support parts 104A and 104B are positioned on the power supply mounting surface S1. For example, the support parts 104A and 104B support the power supply board 125. Specifically, the support parts 104A and 104B protrude from the power supply mounting surface S1 toward the side where the power supply unit 120 is positioned. The tips of the support parts 104A and 104B have claw-like portions that extend toward the inside of the power supply mounting surface S1.

[0045] The support parts 104A and 104B are arranged at intervals in the circumferential direction of the power supply mounting surface S1. In the example shown in Figure 6, the support parts 104A and 104B face each other on the RD of the power supply mounting surface S1 and are positioned at a distance corresponding to the power supply board 125. Note that the power supply housing 10a may have three or more support parts, not limited to the example shown in Figure 6. Furthermore, the positions of the support parts 104A and 104B in the circumferential direction of the power supply mounting surface S1 are not limited to the positions shown in Figure 6.

[0046] The restricting section 105 is positioned on the power supply placement surface S1. The restricting section 105 protrudes from the power supply placement surface S1 toward the side where the power supply unit 120 is positioned. The restricting sections 105 are positioned at intervals in the circumferential direction of the power supply placement surface S1. In the example shown in Figure 6, four restricting sections 105 are positioned at equal intervals along the power supply housing wall W1. Note that the number of restricting sections 105 is not limited to the example in Figure 6; it may be three or fewer, or four or more. Furthermore, the restricting sections 105 may not be positioned along the power supply housing wall W1. Moreover, the position of the restricting section 105 in the circumferential direction of the power supply placement surface S1 is not limited to the position shown in Figure 6.

[0047] At least one of the four restricting sections 105 has a protrusion 105A. The protrusion 105A is located on the side of the restricting section 105 that faces the power supply housing wall section W1 and extends along the power supply housing wall section W1 from the side of the restricting section 105 that faces the power supply placement surface section S1 toward the side where the power supply unit 120 is placed. For example, the protrusion 105A extends to the tip of the power supply housing wall section W1.

[0048] The support of the power supply unit 120 by the support parts 104A and 104B, and the restriction of the movement of the power supply unit 120 by the restricting part 105 will be explained later with reference to Figure 13.

[0049] As shown in Figure 7, when the power supply unit 120 is inserted into the power supply mounting section 10a1 from the opposite side of the power supply mounting surface section S1, the power supply unit 120 is attached to the power supply housing section 10a. Figure 8 shows the state in which the power supply unit 120 is attached to the power supply housing section 10a shown in Figure 6.

[0050] As shown in Figures 7 and 8, when the power supply unit 120 is housed in the power supply housing unit 10a, the protruding portion 105A engages with the recess 126 located on the power supply board 125. In other words, the orientation of the power supply unit 120 relative to the power supply housing unit 10a is determined by the protruding portion 105A and the recess 126. As a result, it becomes easy to identify the mounting direction of the power supply unit 120 relative to the power supply housing unit 10a, and it is possible to prevent the power supply unit 120 from being mounted in the wrong direction relative to the power supply housing unit 10a.

[0051] Furthermore, since the power supply unit 120 can be attached to the power supply housing unit 10a without using screws, the number of parts is reduced, and manufacturing costs can be lowered. In addition, the elimination of screws improves assembly efficiency and allows the light source unit 100 to be made lighter.

[0052] Next, with reference to Figure 9, the connection between the power supply unit 120 and the pair of power supply terminal units 30 will be described. The power supply unit 120 includes, for example, two power cables C1 and C2 extending from the power supply board 125. Power cables C1 and C2 are connected to each of the pair of power supply terminal units 30. In other words, power cable C1 electrically connects the power supply unit 120 to one of the pair of power supply terminal units 30, and power cable C2 electrically connects the power supply unit 120 to the other of the pair of power supply terminal units 30.

[0053] Specifically, power cable C1 includes terminal CT1 and conductive cable CL1. Terminal CT1 is a conductive terminal such as a ring terminal and a pin terminal. Conductive cable CL1 is a sheathed cable, for example. Terminal CT1 is connected to one end of conductive cable CL1 by, for example, crimping and soldering. The other end of conductive cable CL1 is connected to the power supply board 125 by, for example, soldering. Power cable C2 includes terminal CT2 and conductive cable CL2. Terminal CT2 is a conductive terminal such as a ring terminal and a pin terminal. Conductive cable CL2 is a sheathed cable, for example. Terminal CT2 is connected to one end of conductive cable CL2 by, for example, crimping and soldering. The other end of conductive cable CL2 is connected to the power supply board 125 by, for example, soldering.

[0054] For example, terminal CT1 of power cable C1 is screwed onto one of the pair of power supply terminals 30, thereby connecting the power supply unit 120 to one of the pair of power supply terminals 30. Similarly, terminal CT2 of power cable C2 is screwed onto the other of the pair of power supply terminals 30, thereby connecting the power supply unit 120 to the other of the pair of power supply terminals 30.

[0055] Alternatively, power cables C1 and C2 may not include terminals CT1 and C2, respectively, and one end of conductive cables CL1 and CL2 may be soldered to a pair of power supply terminals 30.

[0056] The power supply housing section 10a includes retaining sections 106A and 106B. Retaining section 106A holds the power cable C1. Retaining section 106B holds the power cable C2. For example, retaining section 106A is a groove located on the inner surface of the terminal housing wall section W2 of one power supply terminal arrangement section 10a2. Retaining section 106A is a groove located on the inner surface of the terminal housing wall section W2 of the other power supply terminal arrangement section 10a2. At least a portion of the conductive cable CL1 is laid inside retaining section 106A. At least a portion of the conductive cable CL2 is laid inside retaining section 106B. Therefore, the movement of conductive cables CL1 and CL2 within the power supply housing section 10a is restricted. As a result, it is possible to prevent conductive cables CL1 and CL2 from coming into contact with power supply elements, etc., and to more reliably ensure insulation between conductive cables CL1 and CL2 and the power supply section 120.

[0057] The retaining parts 106A and 106B may also be, for example, cable clips that secure at least a portion of the conductive cables CL1 and CL2 to the terminal housing wall W2, in addition to the grooves. Furthermore, the retaining parts 106A and 106B may be located in places other than the terminal housing wall W2, such as the power supply housing wall W1 or the terminal arrangement surface S2.

[0058] [Cabinet] Next, the mounting of the housing 10b and the power supply unit U1 to the housing 10b will be described with reference to Figures 10 to 12. Figures 10 to 12 show how the power supply unit U1 is mounted to the housing 10b. Figure 10 is a perspective view showing the mounting of the power supply unit U1 to the housing 10b. Figure 11 is a perspective view from a different angle showing the mounting of the power supply unit U1 to the housing 10b. Figure 12 is a diagram showing the housing 10b with the power supply unit U1 mounted.

[0059] The housing 10b is made of a metal such as aluminum. Therefore, the housing 10b has high thermal conductivity and can efficiently dissipate the heat generated from the light source unit 100. As a result, a dedicated component for dissipating the heat from the light source unit 100 is not required, simplifying the configuration of the lighting device. Consequently, the manufacturing cost of the stand-alone lighting device can be reduced.

[0060] The housing 10b further includes a wall portion 23 and a connecting portion 24. The wall portion 23 is positioned inside the cylindrical portion 22 and is erected on the back surface of the end face portion 20a on the first direction D1 side. The inward-facing surface of the wall portion 23 has a shape that conforms to the outer surfaces of the power supply housing wall portion W1 and terminal housing wall portion W2 of the power supply housing portion 10a. The connecting portion 24 connects the cylindrical portion 22 and the wall portion 23. Specifically, the connecting portion 24 is a flat plate member that connects the inward-facing surface of the cylindrical portion 22 and the outward-facing surface of the wall portion 23. In the example of Figures 10 to 12, the housing 10b includes eight connecting portions 24. For example, the eight connecting portions 24 are arranged radially from the wall portion 23 toward the cylindrical portion 22. In the housing 10b, at least the cylindrical portion 22, the wall portion 23, and the connecting portions 24 are made of metal.

[0061] As shown in Figures 10 and 11, when the power supply unit U1 is inserted into the space enclosed by the wall portion 23 from the side opposite the end face portion 20a, the power supply unit U1 is attached to the housing 10b. Figure 12 shows the housing 10b after the power supply unit U1 shown in Figure 9 has been attached. Once the power supply unit U1 is attached to the housing 10b, the power supply unit U1 faces the wall portion 23. The surface of the power supply unit U1 contacts the side of the wall portion 23 that faces inward and the back surface of the end face portion 20a.

[0062] As shown in Figures 10 to 12, when inserting the power supply unit U1 into the housing 10b, the projection 102 engages with the slit 26 located on the inward-facing surface of the wall portion 23. In other words, the projection 102 and the slit 26 determine the orientation of the power supply unit U1 relative to the housing 10b. The projection 102 and the slit 26 are examples of orientation-determining parts. As a result, it becomes easy to identify the mounting direction of the power supply unit U1 relative to the housing 10b, and it is possible to prevent the power supply unit U1 from being mounted in the wrong orientation relative to the housing 10b.

[0063] In addition to the projection 102 and the slit 26, the protrusions 101A and 101B may also function as direction-determining parts. The power supply housing 10a shown in Figures 6 to 12 is rotationally symmetric with respect to the center of the power supply placement surface S1. That is, the protrusions 101A and 101B are rotationally symmetric with respect to the center of the power supply placement surface S1. If the protrusions 101A and 101B were arranged non-rotationally, it would become impossible to mount the power supply unit U1 in the opposite direction to the housing 10b. In this case, the protrusions 101A and 101B function as direction-determining parts.

[0064] Furthermore, in this embodiment, as shown in Figure 11, the housing 10b has openings M1A, M1B, M2A, and M2B. Openings M1A and M1B are located on the end face portion 20a and the projection portion 20, and open facing the direction of the end face portion 20a and the side direction of the projection portion 20. Openings M2A and M2B are located on the side of the projection portion 20, and open facing the side direction of the projection portion 20. Openings M1A and M1B face each other via the projection portion 20. Openings M2A and M2B face each other in the radial direction RD of the housing 10b. When the power supply unit U1 is attached to the housing 10b, a pair of exposed portions R1 are exposed from openings M1A and M1B, and a pair of exposed portions R2 are exposed from openings M2A and M2B.

[0065] By exposing the synthetic resin exposed portion R1 from the metal housing 10b, electrical conductivity between the power supply terminal portion 30 located on the exposed portion R1 and the housing 10b is prevented. In other words, the power supply terminal portion 30 can ensure an electrical insulation distance that takes lightning surges into consideration. Furthermore, by forming the first engaging portion 21 on the synthetic resin exposed portion R2, it becomes easier to form the first engaging portion 21 than by forming it on the metal housing 10b.

[0066] Next, with reference to Figure 13, the support of the power supply unit 120 by the support parts 104A and 104B and the restriction of the movement of the power supply unit 120 by the restricting part 105 will be explained. Figure 13 is a cross-sectional view of the housing part 10. Figure 13 shows a cross-section in a plane perpendicular to the radial direction RD, passing through the support part 104B and one of the four restricting parts 105.

[0067] As shown in Figure 13, the power supply board 125 of the power supply unit 120 is held by the support portion 104B and the restricting portion 105. Specifically, the claw portion located at the tip of the support portion 104B contacts the surface of the power supply board 125 on which the power supply elements are mounted (mounting surface) to support the power supply board 125. Therefore, as shown in Figure 5, when the lighting device 1 is mounted on the ceiling, it is possible to prevent the power supply unit 120 from detaching from the power supply housing portion 10a and falling. On the other hand, the restricting portion 105 contacts the surface of the power supply board 125 on the power supply mounting surface portion S1 side (solder surface) to restrict the movement of the power supply unit 120 toward the power supply mounting surface portion S1. Furthermore, by making the length of the restricting portion 105 from the power supply mounting surface portion S1 to the power supply board 125 longer than the lead wires of the power supply elements protruding from the solder surface, it is possible to prevent the lead wires from contacting the power supply mounting surface portion S1.

[0068] Next, with reference to Figure 14, the mounting of the light source unit 110 to the housing 10b will be described. Figure 14 is a diagram showing the mounting of the light source unit 110 to the housing 10b.

[0069] The light source unit 110 is positioned on the other end of the cylindrical portion 22. Specifically, the light source unit 110 is positioned at the end of the cylindrical portion 22 opposite to the end face portion 20a. For example, the substrate 130 of the light source unit 110 is screwed to the housing 10b with three screws SR. As a result, the substrate 130 of the light source unit 110 is in contact with and covers the wall portion 23. For example, heat generated from the light source unit 110, including the light-emitting element LD, is conducted to the substrate 130, the wall portion 23, the connection portion 24, the cylindrical portion 22, and the end face portion 20a. Also, heat generated from the power supply unit U1 is conducted to the wall portion 23, the connection portion 24, the cylindrical portion 22, and the end face portion 20a, and is mainly conducted to the outside air from the end face portion 20a. Since the substrate 130, wall portion 23, connection portion 24, cylindrical portion 22, and end face portion 20a are made of metal, they can efficiently dissipate heat conducted from the light source portion 110 and power supply unit U1. In particular, the connection portion 24 functions as a heat dissipation fin that can maximize the surface area exposed to air, further improving heat dissipation.

[0070] Furthermore, if at least some of the multiple light-emitting elements LDs arranged on the substrate 130 face the wall portion 23 or the connection portion 24 via the substrate 130, the heat generated from the light-emitting elements LDs is dissipated more efficiently through the substrate 130, the wall portion 23, and the connection portion 24. This is because the distance from the light-emitting elements to the wall portion 23 is shorter compared to the case where the light-emitting elements do not face the wall portion 23.

[0071] Next, a modified example of the light source unit 110 will be described with reference to Figures 15 and 16. Figure 15 shows the light source unit 110A mounted on the housing 10b. Figure 16 shows the light source unit 110B mounted on the housing 10b. As shown in Figure 15, the arrangement of the light-emitting element LDs in the light source unit 110A is different from that of the light source unit 110. Except for the arrangement of the light-emitting element LDs, the light source unit 110A is the same as the light source unit 110.

[0072] The light source unit 110A includes multiple groups of light-emitting elements. In the example shown in Figure 15, the light source unit 110A includes light-emitting element group L1 and light-emitting element group L2. In the example shown in Figure 15, the light source unit 110A includes two groups of light-emitting elements, but the light source unit 110A may include three or more groups of light-emitting elements. For example, light-emitting element group L1 includes 17 light-emitting elements LD, and light-emitting element group L2 includes 6 light-emitting elements LD. The number of light-emitting elements LD included in light-emitting element groups L1 and L2 is not limited to the above.

[0073] For example, the light-emitting element groups L1 and L2 are arranged concentrically on the substrate 130. In the example shown in Figure 15, the number of light-emitting element LDs in light-emitting element group L1 is greater than the number of light-emitting element LDs in light-emitting element group L2, so when light is emitted, light-emitting element group L1 becomes hotter than light-emitting element group L2. In other words, light-emitting element group L1 becomes the hottest when light is emitted. Therefore, if light-emitting element group L1 faces the wall portion 23 via the substrate 130, heat can be dissipated more efficiently in the lighting device 1. Also, for example, if the brightness of light-emitting element group L2 is higher than that of light-emitting element group L1, and light-emitting element group L2 becomes hotter than light-emitting element group L1, the configuration in which light-emitting element group L2 faces the wall portion 23 via the substrate 130 may be used.

[0074] As shown in Figure 16, the light source unit 110B differs from the light source unit 110 in the arrangement of the light-emitting element LDs. Aside from the arrangement of the light-emitting element LDs, the light source unit 110B is identical to the light source unit 110.

[0075] The light source unit 110B includes multiple groups of light-emitting elements. In the example shown in Figure 15, the light source unit 110A includes 12 groups of light-emitting elements L3 to L14. For example, light-emitting elements L3, L8, L9, and L12 each contain three light-emitting elements LDs. Also, for example, light-emitting elements L4 to L7 and L10 to L13 each contain four light-emitting elements LDs. Note that the number of light-emitting elements LDs included in light-emitting elements L3 to L14 is not limited to the above.

[0076] For example, the light-emitting element groups L3 to L14 are arranged radially on the substrate 130. For example, the light-emitting element groups L4 to L7 and L10 to L13 face the connection portion 24 via the substrate 130.

[0077] [Light source cover] Next, the light source cover 11 will be described with reference to Figure 17. Figure 17 shows the lighting device 1 with the housing 10 and the light source cover 11 separated.

[0078] The light source cover 11 has, for example, a substantially cylindrical shape with a lid. The light source cover 11 is made of a resin material such as acrylic (PMMA) or polycarbonate (PC). The light source cover 11 transmits light. The light source cover 11 may have a transparent structure without light diffusion, or it may have a diffusing structure with light diffusion properties. For example, a light source cover 11 with light diffusion functionality can be constructed by forming a milky white light diffusion film by applying a resin containing a light diffusion material such as silica or calcium carbonate, or a white pigment, to the inner surface of the light source cover 11, or by forming minute irregularities on the light source cover 11. Forming minute irregularities on the surface of the light source cover 11 increases the coefficient of friction of the surface of the light source cover 11, making it less likely for the user's fingers to slip when attaching or detaching the light source unit to the lighting device, thus making attachment and detachment easier. The diffusion density of light diffusion by the light source cover 11 may be uniform or non-uniform across the entire surface of the light source cover 11.

[0079] The light source cover 11 includes a first cover portion 111 and a second cover portion 112. The first cover portion 111 faces the light source portion 110. The first cover portion 111 transmits light. The first cover portion 111 is an example of a light-transmitting portion. The second cover portion 112 covers the side surface of the cylindrical portion 22. The first cover portion 111 and the second cover portion 112 are a single unit. Therefore, in this embodiment, the second cover portion 112 transmits light. Because the light-transmitting light source cover 11 covers the light source portion 110 and the side surface of the cylindrical portion 22, some of the light from the light source portion 110 travels through the inside of the second cover portion 112 and reaches the side surface of the cylindrical portion 22. Furthermore, because the second cover portion 112 covers the side surface of the cylindrical portion 22, the distance between the space between the light source portion 110 and the first cover portion 111 and the outside becomes longer, making it easier to suppress the entry of foreign matter into the space between the light source portion 110 and the first cover portion 111. Even if foreign matter enters the gap between the second cover portion 112 and the side surface of the cylindrical portion 22, the foreign matter will remain in the gap between the second cover portion 112 and the side surface of the cylindrical portion 22 and will have difficulty reaching the space between the light source portion 110 and the first cover portion 111. Note that if both the first cover portion 111 and the second cover portion 112 have a light diffusion function, the diffusion densities of the first cover portion 111 and the second cover portion 112 may be the same or different. For example, the diffusion density of the first cover portion 111 may be lower than that of the second cover portion 112.

[0080] Next, the attachment of the light source cover 11 to the housing 10 will be explained with reference to Figures 17 and 18. Figure 18 is a cross-sectional view showing the housing 10 with the light source cover 11 attached.

[0081] As shown in Figure 17, a first recess 107 is arranged on the side surface of the cylindrical portion 22 along the circumferential direction CD. In other words, the side surface of the cylindrical portion 22 is provided with a first recess 107 that is aligned in the same direction as the end surface 20a. On the other hand, a first protrusion 113 is arranged on the second cover portion 112. In other words, the surface of the second cover portion 112 facing the side surface of the cylindrical portion 22 is provided with a first protrusion 113. In the example of Figure 17, three first protrusions 113 are arranged at intervals along the circumferential direction CD. Note that the number of first protrusions 113 arranged on the second cover portion 112 is not limited to three. When the light source cover 11 is attached to the housing portion 10, the first protrusions 113 fit into the first recess 107. The first recess 107 and the first protrusions 113 form a snap fit. The light source cover 11 cannot be easily removed from the housing portion 10. Therefore, the lighting device 1 can be easily attached to and detached from the socket 50, and as shown in Figure 5, when the lighting device 1 is mounted on the ceiling, it is possible to prevent the light source cover 11 from detaching from the housing 10 and falling.

[0082] Furthermore, a second recess 108 is arranged on the side surface of the cylindrical portion 22 along the first direction D1 or the second direction D2. In other words, the side surface of the cylindrical portion 22 is provided with a second recess 108 that is aligned perpendicular to the end face portion 20a. On the other hand, a second protrusion 114 is arranged on the second cover portion 112. In other words, the second protrusion 114 is provided on the surface of the second cover portion 112 that faces the side surface of the cylindrical portion 22. In the example of Figure 17, one second protrusion 114 is arranged. Note that multiple second protrusions 114 may be arranged on the second cover portion 112. In this case, the side surface of the cylindrical portion 22 is provided with a number of second recesses 108 corresponding to the number of second protrusions 114. When the light source cover 11 is attached to the housing portion 10, the second protrusions 114 fit into the second recesses 108. Therefore, rotation of the light source cover 11 in the circumferential direction CD relative to the housing 10 can be suppressed. As a result, removal of the lighting device 1 from the socket 50 becomes easier.

[0083] Embodiments of the present invention have been described above with reference to the drawings (Figures 1 to 18). However, the present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from its spirit. Furthermore, the multiple components disclosed in the above embodiments can be modified as appropriate. For example, some components from all the components shown in one embodiment may be added to the components of another embodiment, or some components from all the components shown in one embodiment may be deleted from the embodiment.

[0084] Furthermore, the drawings schematically show each component in order to facilitate understanding of the invention, and the thickness, length, number, spacing, etc. of each component shown may differ from the actual dimensions due to the convenience of drawing creation. Also, the configuration of each component shown in the above embodiments is merely an example and is not particularly limiting, and it goes without saying that various modifications are possible without substantially departing from the effects of the present invention. [Industrial applicability]

[0085] This invention is applicable to the field of lighting devices. [Explanation of Symbols]

[0086] 1: Lighting device 10b: Enclosure 20:Protrusion 20a: End face part 22:Cylinder part 23 :Wall part 24: Connection part 30: Power supply terminal section 110, 110A, 110B: Light source section 130: Circuit board LD: Light-emitting element U1: Power supply unit

Claims

[Claim 1] A light source that emits light, A power supply unit that supplies power to the light source unit, A housing for the aforementioned power supply unit, A pair of power supply terminals that supply external power to the power supply unit and Equipped with, The aforementioned enclosure is A cylindrical tube section, The end face portion located at one end of the cylindrical portion, The surface and back surface of the end face portion, the protruding portion that protrudes from the surface, A wall portion is positioned inside the cylindrical portion, erected on the back surface of the end face portion, and provided to surround the power supply unit. A connecting portion that connects the cylindrical portion and the wall portion. Includes, The pair of power supply terminals face each other via the protruding portion and protrude from the housing, At least the cylindrical portion, the wall portion, and the connecting portion are made of metal. The power supply unit is arranged in the space enclosed by the wall and faces the wall, The light source is positioned on the other end of the cylindrical portion, in contact with the wall portion, and further, The aforementioned light source unit is Multiple light-emitting elements, The plurality of light-emitting elements are arranged on a substrate that covers the wall portion and Includes, A lighting device in which at least some of the plurality of light-emitting elements face the wall portion or the connection portion via the substrate.

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