Lighting device

Abstract

To provide an illuminating device that can restrain a light source unit from excessively moving in a packing box while securing a light diffusion function.SOLUTION: An illuminating device 1 comprises a light source part 110, a power source part 120, a case 10b, a pair of power supply terminal parts 30, and a light source cover 11. The light source part 110 emits light. The power source part 120 supplies power to the light source part 110. The case 10b houses the power source part 120. The pair of power supply terminal parts 30 supply external power to the power source part 120. The light source cover 11 covers the light source part 110. The light source cover 11 comprises a transmission part 111 and a first protruding part 12. The transmission part 111 is opposed to the light source part 110, and transmits light. The first protruding part 12 protrudes in a first direction from the transmission part 111. The transmission part 111 protrudes in the first direction. A distance from the light source part 110 to a tip part 151 of the first protruding part 12 in the first direction is equal to or shorter than a distance from the light source part 110 to a top part 111A of the transmission part 111 in the first direction.SELECTED DRAWING: Figure 6

Description

Technical Field

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

Background Art

[0002] The lighting device described in Patent Document 1 includes a light emitting unit, a housing, and a translucent cover. The light emitting unit emits light. The housing houses the light emitting unit. The translucent cover transmits the light emitted from the light emitting unit to the outside of the lamp. The translucent cover is provided with a plurality of protrusions. The protrusions can be touched by a user's finger.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the lighting device described in Patent Document 1, the protrusions protrude from the translucent cover. Further, the translucent cover is flat. Therefore, while ensuring the light diffusion function, it was not possible to suppress excessive movement of the light source unit within the packing box.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a lighting device that can suppress excessive movement of a light source unit within a packing box while ensuring a light diffusion function.

Means for Solving the Problems

[0006] The lighting device disclosed herein comprises a light source unit, a power supply unit, a housing, a pair of power supply terminals, and a light source cover. 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 light source cover covers the light source unit. The light source cover has a translucent portion and a first projection. The translucent portion faces the light source unit and transmits the light. The first projection protrudes from the translucent portion in a first direction. The distance from the light source unit to the tip of the first projection in the first direction is less than or equal to the distance from the light source unit to the top of the translucent portion in the first direction. The first direction indicates the direction from the light source unit toward the translucent portion.

[0007] In the lighting device disclosed herein, it is preferable that the distance from the transmissive portion to the tip portion increases as it approaches the outer edge of the transmissive portion.

[0008] The housing of the lighting device disclosed herein preferably further has a cylindrical portion having a substantially cylindrical shape. The cylindrical portion preferably has a recess on its side that extends along the first direction. The light source cover preferably further has a side wall portion that covers the side of the housing. The side wall portion preferably has a second projection that extends along the first direction and protrudes from the side wall portion toward the side of the housing.

[0009] Preferably, the distance from the light source portion of the lighting device disclosed herein to the tip of the first projection in the first direction is the same as the distance from the light source portion to the top of the transmissive portion in the first direction. [Effects of the Invention]

[0010] According to the lighting device of the present invention, it is possible to suppress excessive movement of the light source unit within the packaging box while ensuring the light diffusion function. [Brief explanation of the drawing]

[0011] [Figure 1]This is a perspective view showing a lighting device according to an embodiment of the present invention. [Figure 2] This is another perspective view showing a lighting device according to an embodiment of the present invention. [Figure 3] This is a perspective view showing a socket for a lighting device according to an embodiment of the present invention. [Figure 4] This is a block diagram showing a light source unit of a lighting device according to an embodiment of the present invention. [Figure 5] A cross-sectional view showing a lighting device mounted on the lighting mounting portion of a lighting device according to an embodiment of the present invention. [Figure 6] This is a cross-sectional view showing a light source unit of a lighting device according to an embodiment of the present invention. [Figure 7] This is an enlarged view of the light source cover of the light source unit of a lighting device according to an embodiment of the present invention. [Figure 8] Figure 7 is a cross-sectional view of the light source cover. [Figure 9] This figure shows the power supply housing of a lighting device according to an embodiment of the present invention, but without the power supply housing. [Figure 10] This figure shows the attachment of the power supply unit to the power supply housing unit of a lighting device according to an embodiment of the present invention. [Figure 11] This figure shows the power supply housing in a state in which the power supply unit of a lighting device according to an embodiment of the present invention is housed. [Figure 12] This figure shows the electrical connection between the power supply unit and a pair of power supply terminals of a lighting device according to an embodiment of the present invention. [Figure 13] This is a perspective view showing the mounting of the power supply unit of a lighting device according to an embodiment of the present invention to a housing. [Figure 14] This is a perspective view from a different angle showing the mounting of the power supply unit of the lighting device according to an embodiment of the present invention to the housing. [Figure 15] This figure shows a housing to which a power supply unit of a lighting device according to an embodiment of the present invention is attached. [Figure 16] This is a cross-sectional view of the housing portion of a lighting device according to an embodiment of the present invention. [Figure 17]It is a diagram showing the attachment of the light source unit of the lighting device according to an embodiment of the present invention to the housing. [Figure 18] It is a diagram showing the light source unit attached to the housing of the lighting device according to an embodiment of the present invention. [Figure 19] It is a diagram showing a state where the housing portion and the light source cover of the lighting device according to an embodiment of the present invention are separated. [Figure 20] It is a cross-sectional view showing the housing portion in a state where the light source cover of the lighting device according to an embodiment of the present invention is attached.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and the description will not be repeated. In addition, for ease of understanding, the X-axis, Y-axis, and Z-axis of the three-dimensional orthogonal coordinate system are appropriately shown in the drawings. As an example, the X-axis and Y-axis are substantially parallel to the horizontal plane, and the Z-axis is substantially parallel to the vertical direction.

[0013] Referring to FIGS. 1 to 4, the lighting device 1 according to an embodiment of the present invention will be described. FIG. 1 is a perspective view showing the lighting device 1 according to an embodiment of the present invention. As shown in FIG. 1, the lighting device 1 emits light. The lighting device 1 is detachable from the lighting fixture main body. The lighting fixture main body is attached to the lighting attachment portion of the building. The lighting fixture main body is, for example, a downlight, a bracket light, a spotlight, or the like. The lighting attachment portion is, for example, a ceiling or a wall.

[0014] 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 (Figures 5 and 17, etc.), a power supply section 120 (Figures 5 and 10, etc.), a housing section 10, and a light source cover 11. The light source section 110 emits light. The light source section 110 is located inside the housing section 10, which has a substantially cylindrical shape. The power supply section 120 supplies power to the light source section 110. The light source cover 11 covers the light source section 110. The light source cover 11 is located at the end of the housing section 10 in a first direction D1. The first direction D1 is a direction substantially perpendicular to the lighting mounting section, such as a ceiling. For example, the first direction D1 is substantially parallel to the vertical direction.

[0015] In Figure 1, the center line AX is shown for illustrative purposes. The center line AX is a virtual line passing through the center of the light source unit 100 (housing portion 10). The center line AX is approximately perpendicular to the light source cover 11. Hereafter, the direction perpendicular to the center line AX will be referred to as the "radial direction RD". The "radial direction RD" can be any direction as long as it is perpendicular to the center line AX, and is not particularly limited. The direction along the arc centered on the center line AX will be referred to as the "circumferential direction CD". The first direction D1 is, for example, approximately parallel to the center line AX.

[0016] 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 a power supply unit. The housing 10b houses the power supply housing 10a.

[0017] 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.

[0018] 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 a power supply unit. The housing 10b houses the power supply housing 10a.

[0019] 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.

[0020] The protruding portion 20 projects from the end face portion 20a in a second direction D2. 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Furthermore, 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. 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 is positioned in the circular hole 57 of the socket 50. As a result, the connection between the terminals of the socket 50 and the power supply terminal portion 30 is released, and the light source unit 100 can be removed from the socket 50.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] In detail, the light source unit 110 includes one or more light-emitting elements and a substrate 130 (Figures 5 and 17, etc.). The light-emitting elements are, for example, LEDs (Light Emitting Diodes). In this case, for example, the light source unit 110 is an SMD (surface mount device) element or a COB (chip on board) element. If the light source unit 110 includes multiple light-emitting elements, the light colors of the multiple light-emitting elements may be different or the same. Also, the brightness of the multiple light-emitting elements 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 elements with different light-emitting colors. When lit, one of the two types of light-emitting elements emits light with a high correlated color temperature, for example. When lit, the other type of light-emitting element emits light with a low correlated color temperature, for example.

[0037] 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 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.

[0038] 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 10, 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.

[0039] 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.

[0040] 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 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 between the bottom surface of the case 70 and the housing portion 10 of the light source unit 100. By providing a space, 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.

[0041] [Light source cover] Next, the light source cover 11 will be described with reference to Figures 1 to 8. Figure 6 is a cross-sectional view showing the light source unit 100 of the lighting device 1. Hatching has been omitted in Figure 6 for the sake of understanding the invention. Figure 7 is an enlarged view of the light source cover 11 of the light source unit 100. Figure 8 is a cross-sectional view of the light source cover 11 shown in Figure 7.

[0042] The light source cover 11 has a substantially cylindrical shape with a lid, as shown in Figures 1 and 2. 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 on the inner surface of the light source cover 11 by applying a resin containing a light diffusion material such as silica or calcium carbonate, or a white pigment, 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.

[0043] 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 "transmitting portion". The first cover portion 111 protrudes in the direction toward the first cover portion 111 from the light source portion 110. The direction toward the first cover portion 111 from the light source portion 110 is the first direction D1.

[0044] Specifically, as shown in Figure 6, the first cover portion 111 is separated from the light source portion 110. Generally, as the distance between the light source and the cover decreases, the illuminance of the portion of the cover facing the light source increases. Furthermore, as the distance between the light source and the cover decreases, the area of ​​the portion of the cover facing the light source decreases. In other words, there is a difference in brightness between the portion of the cover facing the light source and the portion of the cover not facing the light source. In this embodiment, the distance between the first cover portion 111 and the light source portion 110 increases as the radial direction RD moves inward. Therefore, the unevenness of illuminance in the first cover portion 111 can be reduced. In other words, when the light source portion 110 emits light, the difference in brightness in the first cover portion 111 can be reduced.

[0045] Furthermore, for example, the distance from the light source unit 110 to the top 111A of the first cover unit 111 in the first direction D1 is distance LB. In other words, as the first cover unit 111 protrudes inward from the top 111A toward the outer edge 111B of the first cover unit 111, the first cover unit 111 protrudes more inward in the inclined radial direction RD. Therefore, compared to a light source cover in which the first cover unit does not protrude, the first cover unit 111 is able to diffuse light.

[0046] Furthermore, the light source cover 11 includes a pair of protrusions 12. The protrusions 12 correspond to an example of a "first protrusion". The protrusions 12 project from the first cover portion 111 in a first direction D1. As shown in Figure 5, when the light source unit 100 is housed in the case 70, if the end face of the light source unit 100 on the first direction D1 side is located on the second direction D2 side of the end of the case 70 on the first direction D1 side, it becomes difficult to visually locate the protrusions 12 of the light source cover 11. However, because the protrusions 12 are positioned on the first cover portion 111 of the light source cover 11, the protrusions 12 are easy to find even by touch. Therefore, the light source unit 100 can be easily removed from the socket 50. In addition, the protrusions 12 make it easier to rotate the light source unit 100 relative to the socket 50 by placing your fingers on the protrusions 12 when removing the light source unit 100.

[0047] Furthermore, the pair of protrusions 12 are arranged on the first cover portion 111 at 180-degree intervals. The protrusions 12 are positioned at a 90-degree angle to the power supply terminal portion 30. The tips of the protrusions 12 are partially chamfered. This reduces the pain felt by the user when they touch the protrusions 12 with their fingers. The protrusions 12 have a tip portion 151, a first connecting portion 152, and a second connecting portion 153.

[0048] The tip portion 151 contacts a part of the packaging box. Specifically, when the light source unit 100 is placed in a packaging box during transport, the tip portion 151 contacts a part of the inner surface of the packaging box. In other words, the tip portion 151 supports a part of the packaging box. Therefore, by each of the tip portions 151 of the pair of projections 12 contacting the packaging box, it is possible to suppress excessive movement of the light source unit 100 placed in the packaging box. As a result, by suppressing excessive movement of the light source unit 100 placed in the packaging box, it is possible to suppress the excessive placement of packaging materials in the packaging box.

[0049] Furthermore, as shown in Figure 8, the tip portion 151 has a tip surface 151A. The tip surface 151A of the tip portion 151 supports the packaging box. In addition, the tip surface 151A of the tip portion 151 extends along the radial direction RD. Specifically, the tip surface 151A of the tip portion 151 extends along the radial direction RD from the first connection portion 152 toward the second connection portion 153. Therefore, the portion of the packaging box that is supported by the tip portion 151 can be increased. As a result, excessive movement of the light source unit 100 housed in the packaging box can be further suppressed by the surface of the tip portion 151.

[0050] The distance LA from the light source unit 110 to the tip 151 of the projection 12 in the first direction D1 is less than or equal to the distance LB from the light source unit 110 to the top 111A of the first cover unit 111 in the first direction D1. In other words, the projection 12 does not protrude beyond the top 111A of the first cover unit 111. Therefore, when the light source unit 100 is placed in a packaging box, the top 111A of the first cover unit 111 and the projection 12 come into contact with the inner surface of the packaging box. As a result, it is possible to suppress the excessive use of packaging material in the packaging box to prevent the light source unit 100 from moving excessively inside the packaging box. In other words, in this embodiment, the posture of the light source unit 100 is stable inside the packaging box, so the amount of packaging material used can be reduced. When the light source unit 100 is removed from the packaging box, the packaging material is often discarded. As in this embodiment, by reducing the amount of packaging material placed in the packaging box, the amount of waste can be reduced. Furthermore, since the first cover portion 111 can be made to protrude in the first direction D1, it is possible to suppress excessive movement of the light source unit 100 inside the packaging box while ensuring the light diffusion function.

[0051] Furthermore, since the projection 12 does not protrude beyond the top 111A of the first cover portion 111, the height of the light source unit 100 in the first direction D1 or the second direction D2 can be reduced. This makes it possible to install the light source unit 100 even in a case 70 with a shallow depth in the first direction D1. Therefore, the degree of freedom in installing the light source unit 100 is improved. In other words, it becomes possible to increase the number of locations where the light source unit 100 can be installed.

[0052] In this embodiment, the distance LA from the light source unit 110 to the tip 151 of the projection 12 in the first direction D1 is the same distance LB from the light source unit 110 to the top 111A of the first cover unit 111 in the first direction D1. In other words, a part of the packaging box is supported by the tips 151 of the pair of projections 12 and the top 111A of the first cover unit 111. The more points of support there are, the more excessive movement of the light source unit 100 within the packaging box can be suppressed. As a result, the amount of packaging material to be contained in the packaging box can be further reduced. Therefore, the amount of waste can be further reduced.

[0053] Furthermore, as shown in Figure 7, the distance from the first cover portion 111 on the first connection portion 152 side of the tip portion 151 to the tip portion 151 is distance LC. Also, the distance from the first cover portion 111 on the second connection portion 153 side of the tip portion 151 to the tip portion 151 is distance LD. Distance LD is longer than distance LC.

[0054] In other words, the distance from the tip 151 of the projection 12 to the tip 151 increases as it approaches the outer edge 111B of the first cover 111. Therefore, the area on which the finger can grip the tip 151 becomes larger as it approaches the outer edge 111B of the first cover 111. Consequently, when removing the light source unit 100, it becomes easier for the user to apply force to the projection 12. As a result, it becomes easier to remove the light source unit 100 from the socket 50. Furthermore, it is possible to increase the area on which the finger can grip the light source unit 100 while suppressing an increase in the height of the light source unit 100. As a result, it is possible to make it easier to remove the light source unit 100 while improving the freedom of installation of the light source unit 100.

[0055] As shown in Figure 7, the first connecting portion 152 connects one end of the tip portion 151 to the first cover portion 111. The one end of the tip portion 151 is the end located radially inward of the first cover portion 111. The first connecting portion 152 is located closer to the top 111A of the first cover portion 111 than the second connecting portion 153. In this embodiment, the user can also place their fingers on the first connecting portion 152. In other words, the user can choose where to place their hand according to the size of their hand. Therefore, it becomes possible to place the fingers in a position where the user can easily apply force.

[0056] The second connecting portion 153 connects the other end of the tip portion 151 to the first cover portion 111. The other end of the tip portion 151 is the end located on the outer edge 111B side of the first cover portion 111. The second connecting portion 153 is located on the outer edge 111B side of the first cover portion 111 than the first connecting portion 152.

[0057] The second connecting portion 153 slopes toward the top portion 111A as it moves from the outer edge 11B of the first cover portion 111 toward the tip portion 151. In other words, as shown in Figure 5, the second connecting portion 153 and the inner circumferential surface of the case 70 are separated. Therefore, a gap is formed between the second connecting portion 153 and the inner circumferential surface of the case 70. This means that the gap between the second connecting portion 153 and the inner circumferential surface of the case 70 can be made larger. Therefore, when removing the light source unit 100, it is possible to prevent fingers from hitting the inner circumferential surface of the case 70 and making it difficult to apply fingers to the protrusion 12. As a result, it becomes easier to apply fingers to the protrusion 12. In addition, the larger area portion of the protrusion 12 can be separated from the inner circumferential surface of the case 70. Therefore, by separating the protrusion 12 from the inner circumferential surface of the case 70, the light source unit 100 can be easily removed from the socket 50.

[0058] Next, the projection 12 will be described in more detail with reference to Figure 8. As shown in Figure 8, the projection 12 further comprises a pair of first curved surfaces 154, a pair of finger rests 155, and a pair of second curved surfaces 156.

[0059] The pair of finger rests 155 are the surfaces on which the user places their fingers when removing the light source unit 100 from the socket 50. In other words, the finger rests 155 support the user's fingers. The area of ​​the finger rests 155 increases from the first connection part 152 towards the second connection part 153.

[0060] The first curved portion 154 connects the first cover portion 111 and the finger rest surface 155. The first curved portion 154 has a curved surface that is convex toward the inside of the first cover portion 111. In other words, the connection portion between the first cover portion 111 and the finger rest surface 155 is a curved surface. Therefore, light can be dispersed by the first curved portion 154. For example, if the connection portion is a corner, light will concentrate at the corner, resulting in high brightness at the corner.

[0061] As in this embodiment, by positioning the first curved surface 154 between the first cover portion 111 and the finger rest surface 155, light does not concentrate on the first curved surface 154. Therefore, it is possible to suppress the difference in brightness between the first cover portion 111 and the protrusion portion 12. As a result, when the light source portion 110 emits light, it is possible to suppress the visibility of the connection portion between the first cover portion 111 and the finger rest surface 155.

[0062] The second curved portion 156 connects the tip surface 151A and the finger rest surface 155. The second curved portion 156 has a curved surface that is convex toward the outside of the first cover portion 111. In other words, the connection portion between the tip surface 151A and the finger rest surface 155 is a curved surface. Therefore, light can be dispersed in the second curved portion 156. For example, if the connection portion between the tip surface and the finger rest surface is a corner, light will concentrate at the corner, resulting in high brightness at the corner.

[0063] As in this embodiment, by positioning the second curved portion 156 between the tip surface 151A and the finger rest surface 155, light does not concentrate on the second curved portion 156. Therefore, it is possible to suppress the difference in brightness between the tip surface 151A and the projection 12. As a result, when the light source 110 emits light, it is possible to suppress the visibility of the connection portion between the tip surface 151A and the finger rest surface 155.

[0064] Furthermore, as in this embodiment, since light is not concentrated on the first curved portion 154 and the second curved portion 156, it is possible to suppress differences in brightness between the protrusion 12 and the first cover portion 111. Therefore, when the light source 110 emits light, the protrusion 12 is less conspicuous. In addition, because the second curved portion 156 is curved, it is possible to reduce the pain felt by the user when they touch the protrusion 12 with their finger.

[0065] In this embodiment, the distance from one first curved surface portion 154 to the other first curved surface portion 154 is longer than the distance from one second curved surface portion 156 to the other second curved surface portion 156. In other words, the projection 12 becomes thicker as it moves from the second curved surface portion 156 towards the first curved surface portion 154. Therefore, the strength of the projection 12 can be improved as it moves from the second curved surface portion 156 towards the first curved surface portion 154. As a result, it is possible to suppress the breakage of the projection 12 when removing the light source unit 100. In addition, by making the second curved surface portion 156 a curved surface, the stress on the projection 12 can be distributed by the second curved surface portion 156 when removing the light source unit 100.

[0066] As shown in Figure 7, the second cover portion 112 covers the side surface of the cylindrical portion 22. The second cover portion 112 corresponds to an example of a "side wall portion". The second cover portion 112 and the first cover portion 111 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. In addition, 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 intrusion of foreign matter into the space between the light source portion 110 and the first cover portion 111. Even if foreign matter were to enter the gap between the second cover portion 112 and the side of the cylindrical portion 22, the foreign matter would remain in the gap between the second cover portion 112 and the side of the cylindrical portion 22 and would have difficulty reaching the space between the light source portion 110 and the first cover portion 111.

[0067] Furthermore, if both the first cover portion 111 and the second cover portion 112 have a light diffusion function, the diffusion concentrations of the first cover portion 111 and the second cover portion 112 may be the same or different. For example, the diffusion concentration of the first cover portion 111 may be lower than that of the second cover portion 112.

[0068] [Power supply unit] Next, the power supply unit will be described with reference to Figures 9 to 12. Figures 9 to 12 show how to assemble the power supply unit. Figure 9 shows the power supply housing 10a without the power supply unit 120 housed inside. Figure 10 shows the power supply unit 120 being attached to the power supply housing 10a. Figure 11 shows the power supply housing 10a with the power supply unit 120 housed inside. Figure 12 shows the electrical connection between the power supply unit 120 and the pair of power supply terminals 30.

[0069] Figure 9 shows the interior of the power supply housing 10a. Specifically, Figure 9 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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 9, 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 9. 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 9.

[0076] 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 9, 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 shown in Figure 9; 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 9.

[0077] 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.

[0078] 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 16.

[0079] As shown in Figure 10, 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 11 shows the state in which the power supply unit 120 is attached to the power supply housing section 10a shown in Figure 9.

[0080] As shown in Figures 10 and 11, 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.

[0081] Next, with reference to Figure 12, 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] [Cabinet] Next, the mounting of the housing 10b and the power supply unit to the housing 10b will be described with reference to Figures 13 to 15. Figures 13 to 15 show how the power supply unit is mounted to the housing 10b. Figure 13 is a perspective view showing the mounting of the power supply unit to the housing 10b. Figure 14 is a perspective view from a different angle showing the mounting of the power supply unit to the housing 10b. Figure 15 is a diagram showing the housing 10b with the power supply unit mounted.

[0088] 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.

[0089] 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. 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 the 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 shown in Figures 13 to 15, 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.

[0090] As shown in Figures 13 and 14, when the power supply unit is inserted into the space enclosed by the wall portion 23 from the side opposite the end face portion 20a, the power supply unit is attached to the housing 10b. Figure 15 shows the housing 10b after the power supply unit shown in Figure 12 has been attached. Once the power supply unit is attached to the housing 10b, the power supply unit faces the wall portion 23. The surface of the power supply unit contacts the side of the wall portion 23 that faces inward and the back surface of the end face portion 20a.

[0091] As shown in Figures 13 to 15, when inserting the power supply unit 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 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 relative to the housing 10b, and it is possible to prevent the power supply unit from being mounted in the wrong orientation relative to the housing 10b.

[0092] 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 9 to 15 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 in the opposite direction to the housing 10b. In this case, the protrusions 101A and 101B function as direction-determining parts.

[0093] Furthermore, in this embodiment, as shown in Figure 14, 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 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.

[0094] 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.

[0095] Next, with reference to Figure 16, 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 16 is a cross-sectional view of the housing part 10. Figure 16 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.

[0096] As shown in Figure 16, 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.

[0097] Next, with reference to Figure 17, the mounting of the light source unit 110 to the housing 10b will be described. Figure 17 is a diagram showing the mounting of the light source unit 110 to the housing 10b.

[0098] 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, is conducted to the substrate 130, wall portion 23, connection portion 24, cylindrical portion 22, and end face portion 20a. Also, heat generated from the power supply unit is conducted to the wall portion 23, connection portion 24, cylindrical portion 22, and 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 the heat conducted from the light source unit 110 and the power supply unit. In particular, the connection portion 24 functions as a heat dissipation fin that can maximize the surface area exposed to the air, further improving heat dissipation.

[0099] Furthermore, if at least some of the multiple light-emitting elements arranged on the substrate 130 face the wall 23 via the substrate 130, the heat generated from the light-emitting elements is dissipated more efficiently through the substrate 130 and the wall 23. This is because the distance from the light-emitting elements to the wall 23 is shorter compared to the case where the light-emitting elements do not face the wall 23.

[0100] Next, a modified example of the light source unit 110 will be described with reference to Figure 18. Figure 18 shows the light source unit 110A mounted on the housing 10b. The light source unit 110A differs from the light source unit 110 in the arrangement of the light-emitting elements. Aside from the arrangement of the light-emitting elements, the light source unit 110A is the same as the light source unit 110.

[0101] The light source unit 110A includes multiple groups of light-emitting elements. In the example shown in Figure 18, the light source unit 110A includes light-emitting element group L1 and light-emitting element group L2. In the example shown in Figure 18, 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, and light-emitting element group L2 includes 6 light-emitting elements. The number of light-emitting elements included in light-emitting element groups L1 and L2 is not limited to the above.

[0102] For example, the light-emitting element groups L1 and L2 are arranged concentrically on the substrate 130. In the example shown in Figure 18, the number of light-emitting elements in light-emitting element group L1 is greater than the number of light-emitting elements 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 light-emitting element group L2 may be configured to face the wall portion 23 via the substrate 130.

[0103] Next, the attachment of the light source cover 11 to the housing 10 will be explained with reference to Figures 19 and 20. Figure 19 is a diagram showing the lighting device 1 with the housing 10 and the light source cover 11 separated. Figure 20 is a cross-sectional view showing the housing 10 with the light source cover 11 attached.

[0104] As shown in Figure 19, the side surface of the cylindrical portion 22 has a first recess 107 and a second recess 108. The first recess 107 is positioned along the circumferential direction CD of the side surface of the cylindrical portion 22. The second recess 108 is positioned along the first direction D1 or the second direction D2 of the side surface of the cylindrical portion 22. The second recess 108 corresponds to an example of a "recess". In other words, the side surface of the cylindrical portion 22 is provided with a second recess 108 extending along the first direction D1.

[0105] The second cover portion 112 has a first protrusion 113. In other words, the first protrusion 113 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 19, three first protrusions 113 are arranged at intervals in the circumferential direction CD. Therefore, the light source cover 11 can be easily attached to and detached from the housing portion 10, and as shown in Figure 5, when the lighting device 1 is mounted on the ceiling, the light source cover 11 can be prevented from detaching from the housing portion 10 and falling. 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 recesses 107. The first recesses 107 and the first protrusions 113 form a snap fit. The light source cover 11 cannot be easily detached 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.

[0106] Furthermore, the second cover portion 112 has a second protrusion 114. In other words, the second protrusion 114 is provided on the surface of the second cover portion 112 facing the side surface of the cylindrical portion 22. The second protrusion 114 corresponds to an example of a "second projection." The second protrusion 114 extends along the first direction D1 or the second direction D2 and protrudes from the second cover portion 112 toward the side surface of the cylindrical portion 22. The second protrusion 114 is inserted into the second recess 108. That is, the second protrusion 114 can be fitted into the second recess 108, as shown in Figure 20. Therefore, the position of the second protrusion 114 in the second recess 108 makes it possible to transmit the force used to rotate the light source unit 100 from the light source cover 11 to the light source portion 110. Consequently, when removing the light source unit 100 from the socket 50, it is possible to suppress the light source cover 11 from rotating in the circumferential direction CD relative to the housing portion 10. As a result, it becomes easier to remove the lighting device 1 from the socket 50.

[0107] In the example shown in Figure 19, one second protrusion 114 is provided. Note that multiple second protrusions 114 may be provided 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.

[0108] Embodiments of the present invention have been described above with reference to the drawings. For ease of understanding, the drawings schematically show each component, and the thickness, length, number, spacing, etc. of each component shown may differ from the actual dimensions due to the limitations of drawing creation. Furthermore, the speed, material, shape, dimensions, etc. of each component shown in the above embodiments are examples only and are not particularly limiting, and various modifications are possible without substantially departing from the configuration of the present invention. [Industrial applicability]

[0109] This invention provides a lighting device and has industrial applicability. [Explanation of Symbols]

[0110] 1: Lighting device 10b: Enclosure 11: Light source cover 11B: Outer edge 12:Protrusion 22:Cylinder part 23 :Wall part 30: Power supply terminal section 102: Protrusion 110: Light source section 110A: Light source section 111A: Top 111B: Outer edge 120: Power supply section 126: Recess 151:Tip CD: Circumferential direction D1: 1st direction

Claims

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, The power supply unit includes a pair of power supply terminals that supply external power, A light source cover that covers the light source unit and Equipped with, The aforementioned light source cover is Opposite the light source, a transmissive portion that transmits the light, A first projection protruding from the transparent portion in a first direction and It has, The transparent portion protrudes in the first direction such that the distance from the light source increases as it moves inward in the radial direction. The distance from the light source to the tip of the first projection in the first direction is the same as the distance from the light source to the top of the transmissive part in the first direction. The tip of the first projection has a tip surface that extends along the radial direction, The first direction indicates the direction from the light source to the transmissive portion, in this lighting device.

2. The lighting device according to claim 1, wherein the distance from the transparent portion to the tip portion increases as it approaches the outer edge of the transparent portion.

3. The housing further comprises a cylindrical portion having a substantially cylindrical shape, The cylindrical portion has a recess on its side that extends along the first direction, The light source cover further has a side wall portion that covers the side of the housing, The lighting device according to claim 1 or claim 2, wherein the side wall portion extends along the first direction and has a second projection portion that protrudes from the side wall portion toward the side surface of the housing.

Images