Lighting device

Abstract

The objective of this disclosure is to suppress glare for people who view the lighting device at an angle along its longitudinal direction, and to improve the ease of assembly of the lighting device. [Solution] The cover body 50 has a top surface portion 511, an inner cover portion 512, and two side cover portions 52. The top surface portion 511 faces the support member 3 that supports the light source. The inner cover portion 512 is positioned between the top surface portion 511 and the support member 3. The side cover portion 52 has a side plate portion 53 that extends from the short edge of the top surface portion 511 toward the support member 3, and a connecting portion 58 that is closer to the support member 3 than the side plate portion 53 and is connected to the support member 3. The inner cover portion 512 is stretched between the two side plate portions 53 and is integral with the two side plate portions 53. The optical panel 56 is positioned between the top surface portion 511 and the inner cover portion 512 and controls the longitudinal distribution of light that passes through the optical panel 56 and is emitted to the outside of the cover 5.

Description

Technical Field

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

Background Art

[0002] Patent Document 1 discloses the following matters regarding a lighting fixture. The lighting fixture includes a light source unit, a holding unit to which the light source unit is attached, and a light distribution control member. The light distribution control member includes a light control member that covers the light source unit, is attached to the holding unit, and has a light transmission portion, a light diffusion portion that is provided between the light transmission portion and the light source unit and forms a curved surface, and a facing portion that integrates the light control member and the light diffusion portion on the holding unit side of the light diffusion portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Patent Document 1 discloses performing light distribution control of light emitted from a lighting fixture, but does not describe suppressing glare when the lighting fixture is observed obliquely particularly along the longitudinal direction, and therefore does not describe improving the assemblability of the lighting fixture when providing a configuration for suppressing glare. <病院の照明装置における配光制御に関する研究]]

[0005] An object of the present disclosure is to provide a lighting device in which a person who views the lighting device obliquely along the longitudinal direction is less likely to feel glare and which has good assemblability.

Means for Solving the Problems

[0006] An illumination device according to one aspect of the present disclosure comprises a long light source, a support member that is long in the longitudinal direction of the light source and supports the light source, and a cover that is long in the longitudinal direction and is supported by the support member so as to cover the light source. The cover comprises a cover body and an optical panel. The cover body has a top surface portion, an inner cover portion, and two side cover portions. The top surface portion is flat, light-transmitting, and faces the support member at a distance from it. The inner cover portion is flat, light-transmitting, and is positioned between the top surface portion and the support member, and faces both the top surface portion and the support member at a distance from it. Each of the two side cover portions has a side plate portion extending from the short edge of the top surface portion toward the support member, and a connecting portion located toward the support member than the side plate portion and connected to the support member, wherein the short direction is perpendicular to both the direction in which the top surface portion and the support member face each other and the longitudinal direction. The inner cover portion is stretched between the two side plate portions, and the inner cover portion and the two side plate portions are integral. The optical panel is positioned between the top surface portion and the inner cover portion and controls the longitudinal distribution of light that passes through the optical panel and is emitted to the outside of the cover. [Effects of the Invention]

[0007] According to one aspect of this disclosure, there is an advantage in that the lighting device can be made to suppress glare for people who view it obliquely along its longitudinal direction, and can also be made to be easily assembled. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of a lighting fixture according to an embodiment of this disclosure. [Figure 2] Figure 2 is an exploded perspective view of the same lighting fixture and the light source unit according to the embodiment of this disclosure. [Figure 3] Figure 3 is a perspective view from above of the light source unit and the fixture body of the lighting fixture shown above. [Figure 4]Figure 4 is a partially broken perspective view of the fixture body of the same lighting fixture, seen from below. [Figure 5] Figure 5 is a partial perspective view of the support member and light source module shown above, seen from below. [Figure 6] Figure 6 is a side view of the same lighting fixture, with one cover end and one end plate omitted. [Figure 7] Figure 7 is a plan view of the main components of the light source unit shown above. [Figure 8] Figure 8 is a plan view of the main components of the light source unit shown above. [Figure 9] Figure 9 is a vertical cross-sectional view of the same lighting fixture, with some parts omitted. [Figure 10] Figure 10 is a vertical cross-sectional view of the same lighting fixture, with some parts omitted. [Figure 11] Figure 11 is a circuit block diagram of the same light source unit. [Figure 12] Figure 12 is an exploded side view of the same lighting fixture, with one cover end and one end plate omitted. [Figure 13] Figure 13 is an exploded perspective view of the cover of the same lighting fixture. [Figure 14] Figure 14 is a side view of the same fixture body and light source unit, with one cover end and one end plate omitted. [Figure 15] Figure 15 is a side view of the same lighting fixture in a temporarily suspended state, with one cover end and one end plate omitted. [Figure 16] Figure 16 is a plan view showing the fixture bodies of the above-mentioned lighting fixtures arranged in series during installation. [Figure 17] Figure 17 is a side view of the main components of the light source unit shown above, with the power supply unit and power connector not connected. [Figure 18] Figure 18 is an exploded perspective view of the cover of the lighting fixture in Modification Example 1. [Figure 19] Figure 19 is a perspective view of the lighting fixture of Modification 3. [Figure 20]FIG. 20 is an exploded perspective view of the lighting fixture of Modification 3.

Embodiments for Carrying Out the Invention

[0009] Hereinafter, the lighting device according to the embodiment of the present disclosure will be described in detail with reference to the drawings. However, each of the drawings described in the following embodiments is a schematic diagram, and the respective ratios of the sizes and thicknesses of the respective components do not necessarily reflect the actual dimensional ratios. Note that the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications can be made according to the design and the like as long as the effects of the present disclosure can be achieved.

[0010] (1) Overview The lighting device (light source unit A1) of the embodiment includes a long light source (light source module 1), a support member 3 that supports the light source and is long in the longitudinal direction of the light source, and a cover 5 that is supported by the support member 3 so as to cover the light source and is long in the longitudinal direction. The cover 5 includes a cover body 50 and an optical panel 56. The cover body 50 has a top surface portion 511, an inner cover portion 512, and two side cover portions 52. The top surface portion 511 is flat and has light transmissivity, and faces the support member 3 with a gap therebetween. The inner cover portion 512 is flat and has light transmissivity, and is disposed between the top surface portion 511 and the support member 3 and faces both the top surface portion 511 and the support member 3 with a gap therebetween. Each of the two side cover portions 52 has a side plate portion 53 that extends from the edge in the short direction of the top surface portion 511 toward the support member 3 side, and a coupling portion 58 that is on the support member 3 side of the side plate portion 53 and is coupled to the support member 3. The short direction is a direction orthogonal to both the direction in which the top surface portion 511 and the support member 3 face each other and the longitudinal direction. The inner cover portion 512 is spanned between the two side plate portions 53, and the inner cover portion 512 and the two side plate portions 53 are integral. The optical panel 56 is disposed between the top surface portion 511 and the inner cover portion 512, and controls the longitudinal light distribution of the light that exits to the outside of the cover 5 after passing through the optical panel 56.

[0011] According to the embodiment, the light emitted from the light source sequentially passes through the inner cover portion 512, the optical panel 56, and the top surface portion 511, and is emitted to the outside of the lighting device. At this time, the optical panel 56 can suppress a person viewing the lighting device obliquely along the longitudinal direction from feeling dazzled by controlling the longitudinal light distribution of the light emitted to the outside of the cover 5. Further, since the optical panel 56 is disposed between the opposing flat top surface portion 511 and the flat inner cover portion 512, and the inner cover portion 512 is integral with the side plate portion 53, when the cover 5 is attached to the support member 3 or the like, the optical panel 56 is suppressed from falling off the cover 5, and thus the assemblability of the lighting device can be improved.

[0012] (2) Details A more specific configuration of the lighting device according to the embodiment will be described. In the following description, the side of the support member 3 with respect to the top surface portion 511 in the lighting device is defined as upward, and the side of the top surface portion 511 with respect to the support member 3 is defined as downward. Also, the direction in which the top surface portion 511 and the support member 3 face each other is also referred to as the vertical direction. The longitudinal direction is, unless otherwise specified, the longitudinal direction of the light source (light source module 1). The short-side direction is, unless otherwise specified, a direction orthogonal to both the direction in which the top surface portion 511 and the support member 3 face each other (vertical direction) and the longitudinal direction described above.

[0013] ((2-1) Lighting fixture First, the lighting fixture B1 (hereinafter abbreviated as the lighting fixture B1) will be described. <00​​​​​The main body of the device 6 comprises a long, box-shaped housing section 60 with an open bottom, and a pair of end plates 62 provided at both ends of the housing section 60 in the longitudinal direction (see Figures 2 and 3). The housing section 60 is formed by punching and bending a metal plate.

[0016] The fixture body 6 is installed on the ceiling S1 by inserting suspension bolts 90 through at least two of the multiple mounting holes 63 provided on the bottom (top) surface of the housing 60, and tightening nuts 91 onto these suspension bolts 90 (see Figure 2). In addition, a power cable 92 is inserted through one of the multiple power supply holes 64 provided on the bottom surface of the housing 60. However, if multiple lighting fixtures B1 are installed, another power cable for daisy-chaining may be inserted through a different power supply hole 64. Furthermore, as will be described later, another power cable for daisy-chaining may be inserted through a hole formed by cutting out a knockout portion 620 (see Figure 2) provided on the end plate 62.

[0017] A terminal block 65 is attached to the bottom of the housing 60. The terminal block 65 is electrically connected to the power line 93. A power connector 94 is provided at the end of the power line 93.

[0018] The power cable 92 inserted through the power hole 64 of the fixture body 6 is electrically connected to the terminal block 65, and via the terminal block 65, power line 93, and power connector 94, it is electrically connected to the power unit 2 of the light source unit A1.

[0019] The housing section 60 has two first hook fittings 603 (first hooked parts) and two second hook fittings 601 (second hooked parts) each having a hooking hole 600, located near both ends in its longitudinal direction (see Figures 2 and 4). The first hook fittings 603 are provided on the side wall of one end of the housing section 60 in the short direction. The second hook fittings 601 are positioned on the upper part of the housing section 60 in the short direction, opposite to the first hook fittings 603 (see Figures 2 and 5). In addition, instead of providing the first hook fittings 603 in the main body of the device 6, the hooking holes 600 may be provided on the side wall of one end of the housing section 60 in the short direction.

[0020] (2-2) Light source unit As shown in Figures 2 and 3, the light source unit A1 comprises a light source (light source module 1), a support member 3, a cover 5, a first hooking member 37, and a second hooking member 38. The light source unit A1 further comprises a power supply unit 2 and a communication unit 4.

[0021] (2-2-1) Light source The light source (light source module 1) has two substrates 11 and a plurality of light-emitting elements 10 mounted on the surface (bottom surface) of each substrate 11. The light-emitting elements 10 are, for example, LEDs (Light Emitting Diodes). The LEDs are, for example, packaged white LEDs for illumination. However, the light-emitting elements are not limited to LEDs and may also be organic electroluminescent elements or semiconductor laser elements, etc.

[0022] Each substrate 11 is formed in a long rectangular shape. Multiple light-emitting elements 10 are mounted in a single row at equal intervals along the longitudinal direction of each substrate 11, in the center of the short side of the surface (bottom surface) of each substrate 11 (see Figure 2). The numerous light-emitting elements 10 are electrically connected in series or series-parallel by printed wiring formed on the surface of each substrate 11. In addition, two connectors 12 are mounted on one end of the longitudinal direction of the surface (bottom surface) of each substrate 11 (see Figure 5). A male connector 121 is mounted as the connector 12 on one substrate 11, and a female connector 122 is mounted as the connector 12 on the other substrate 11. The connection between the male connector 121 and the female connector 122 connects the two substrates 11, and the printed wiring formed on the surfaces of each substrate 11 is electrically connected. The positions of the connectors 12 and the positions of each light-emitting element 10 on the substrate 11 are offset in the longitudinal direction. In other words, when viewed in the short direction, the position of the connector 12 and the position of each light-emitting element 10 do not overlap.

[0023] The light source module 1 is attached to the first surface 30A (bottom surface) of the support member 3.

[0024] (2-2-2) Support member 3 The support member 3 is formed from a metal plate in a long, rectangular shape (see Figures 2 and 7). The support member 3 has a flat bottom plate 30 that is long in the longitudinal direction and has thickness in the vertical direction, and support parts (support pieces 31) that extend upward from each of the edges on both sides of the bottom plate 30 in the short direction. The support pieces 31 are flat and are long in the longitudinal direction and have thickness in the short direction. The light source module 1 is attached to the first surface 30A (bottom surface) of the bottom plate 30 by a plurality of claws 301 that are cut out from the bottom plate 30 (see Figure 5). The width of the bottom plate 30 in the short direction is greater than the width of the substrate 11 in the short direction (see Figure 2). However, the light source module 1 may also be attached to the bottom plate 30 by sliding the substrate 11 along the longitudinal direction of the bottom plate 30 and hooking it onto the plurality of claws 301, and then restricting the movement of the substrate 11 with retaining pieces provided on the bottom plate 30. Alternatively, mounting methods such as attaching the circuit board 11 by hooking protrusions other than the claws 301 onto the edges of the circuit board 11, or attaching the circuit board 11 to the bottom plate 30 with adhesive, may be used.

[0025] Furthermore, the base plate 30 has projections 34 at both ends in its short direction (see Figure 6). Each projection 34 is formed in a U-shape when viewed from the longitudinal direction of the base plate 30 and protrudes downward from the first surface 30A of the base plate 30. The pair of support pieces 31 protrude upward from the outer ends of the projections 34.

[0026] The support member 3 is provided with a pair of first hooking members 37 that protrude outwards from one end in the short direction near both ends in the longitudinal direction (see Figures 1 and 2). Furthermore, the support member 3 is provided with a pair of second hooking members 38 at the other end in the short direction near both ends in the longitudinal direction (see Figure 2). The pair of first hooking members 37 and the pair of second hooking members 38 play a role in holding the light source unit A1 to the fixture body 6, as will be described later.

[0027] (2-2-3) First hooking member The first hooking member 37 has a main piece 370 formed in the shape of a rectangular flat plate, a rising piece 371 bent upward from one end edge in the longitudinal direction of the main piece 370, and a hooking piece 372 projecting in the opposite direction from the main piece 370 from the tip (upper end) of the rising piece 371 (see Figures 6 to 8). The tip of the hooking piece 372 is bent in a V shape. The main piece 370, the rising piece 371, and the hooking piece 372 are integrally formed by bending a single metal plate.

[0028] The first hooking member 37 is attached to the support member 3 via a mounting bracket 39. The mounting bracket 39 has a first mounting portion 391, a second mounting portion 392, and a temporary holding portion 393 (see Figures 6 to 8).

[0029] The first mounting section 391 includes a rectangular first mounting plate 3910, a veneer 3911 rising from one end edge of the first mounting plate 3910 in the short direction, and four support pieces 3912 projecting upward from the other end of the first mounting plate 3910 in the short direction (see Figures 6 to 8). One L-shaped support projection 3913 protrudes from each end in the width direction at the tip of the veneer 3911.

[0030] Each of the four support pieces 3912 is formed in an L-shape. The four support pieces 3912 are arranged in two rows with a gap between them, along the short and long directions of the first mounting plate 3910. However, two support pieces 3912 arranged along the long direction of the first mounting plate 3910 are positioned so that their ends are close to each other.

[0031] The first hooking member 37 has its main piece 370 inserted into the space between the four support pieces 3912 and the first mounting plate 3910, and its hook piece 372 inserted into the space between the tip of the veneer 3911 and the pair of support projections 3913. In other words, the first hooking member 37 is attached to the first mounting portion 391 by the four support pieces 3912 and the pair of hook pieces 372 so that it can slide along the short side of the first mounting plate 3910 (the short side of the bottom plate 30) (see Figures 7 and 8).

[0032] The second mounting portion 392 includes a flat second mounting plate 3920 connected to one end edge of the first mounting plate 3910 in the short direction, and a retaining piece 3921 projecting upward from the second mounting plate 3920 (see Figures 7 and 8). The retaining piece 3921 is formed in an inverted U shape.

[0033] The temporary holding portion 393 is formed in a plate shape and protrudes upward from one end of the second mounting plate 3920 in the longitudinal direction (the longitudinal direction of the bottom plate 30). The temporary holding portion 393 is formed integrally with the second mounting portion 392.

[0034] A recess 3930 is formed in the upper end portion of the temporary holding portion 393. The recess 3930 is formed such that one wall is aligned in the vertical direction, and the opposite wall is inclined upward away from the wall on the other side (see Figure 6). In addition, the area adjacent to the recess 3930 in the upper end portion of the temporary holding portion 393 is cut out in an L-shape.

[0035] The mounting bracket 39 is screwed to the second surface (the surface opposite to the first surface 30A (the top surface)) of the bottom plate 30 of the support member 3. However, the mounting bracket 39 may be fixed to the bottom plate 30 by methods other than screwing, such as crimping, welding, or adhesive.

[0036] (2-2-4) Second hooking member The second hooking member 38 has a coil portion 380 corresponding to a fixing portion and an arm portion 381 that protrudes from the coil portion 380 and hooks onto the fixture body 6 (second hooking fitting 601) (see Figures 7 and 8). The arm portion 381 is formed by extending one of the two winding ends of the coil portion 380. In the following description, the other winding end of the coil portion 380 will be referred to as the winding end portion 382. The winding end portion 382 is formed to be considerably shorter than the arm portion 381 (see Figures 7 and 8).

[0037] The arm portion 381 has a bent portion 383 that bends downward along the height direction, approaching the support member 3. The angle of the bend of the bent portion 383 is obtuse. The tip of the arm portion 381 is bent into an L shape (see Figures 7 and 8).

[0038] The second hooking member 38 is attached to the support member 3 via the mounting bracket 39. That is, the second hooking member 38 is attached to the second mounting portion 392 by hooking the coil portion 380 onto the retaining piece 3921 of the second mounting portion 392 (see Figures 7 and 8). When attached to the second mounting portion 392, the arm portion 381 is positioned to go over the temporary holding portion 393.

[0039] The tip of the winding end 382 is bent at approximately a right angle. The tip of the winding end 382 is then inserted through a groove 3922 provided in the second mounting plate 3920 and into a through hole provided in the bottom plate 30. This restricts the axial rotation of the coil portion 380.

[0040] (2-2-5) Power supply unit The power supply unit 2 comprises a power supply device 20 and a power supply case 21 that houses the power supply device 20 (see Figure 9).

[0041] The power supply unit 20 includes a printed circuit board 22 on which wiring conductors are printed on a rectangular insulating substrate, and a plurality of circuit components (not shown) mounted on both the front and back surfaces of the printed circuit board 22. In other words, the power supply unit 20 is composed of printed circuits.

[0042] Figure 11 shows the circuit configuration of the power supply unit 20. The power supply unit 20 includes a power conversion circuit 200, a constant current circuit 201, a control circuit 202, and the like.

[0043] The power conversion circuit 200 includes, for example, a rectifier circuit such as a diode bridge, a boost chopper circuit (power factor correction circuit), and the like. The power conversion circuit 200 converts AC power supplied from an external power supply P1 through a power connector 23 into DC power. The external power supply P1 is, for example, a commercial power grid that supplies AC voltage and AC current with an effective value of 100V or 200V. However, the power conversion circuit 200 may include a switching power supply circuit with a power factor correction function, such as a buck chopper circuit, a buck-boost chopper circuit, or a flyback converter, instead of a boost chopper circuit.

[0044] The constant current circuit 201 includes, for example, a buck converter. The constant current circuit 201 steps down the DC voltage output from the power conversion circuit 200 and applies it to the light source module 1, and also adjusts the DC current flowing through the light source module 1. However, the constant current circuit 201 may include various chopper circuits, series regulators, etc., instead of the buck converter.

[0045] The control circuit 202 includes, for example, a microcontroller. The control circuit 202 controls the power conversion circuit 200 to maintain its output voltage at a constant DC voltage. Furthermore, the control circuit 202 controls the step-down chopper circuit of the constant current circuit 201 to match the DC current supplied from the constant current circuit 201 to the light source module 1 to a target value. As will be described later, the control circuit 202 changes the target value of the DC current supplied to the light source module 1 in accordance with the dimming signal received from the communication unit 4.

[0046] Here, the power connector 23 is mounted on one end of the printed circuit board 22 in the longitudinal direction (see Figure 9). In this embodiment, the power connector 23 is a connector to which the power connector 94 is inserted and removed, but a terminal block to which the conductors of the electric wire are electrically connected may be used instead of the power connector 23. Alternatively, instead of the power connector 23, lead wires may be drawn out from the power supply unit 20 and soldered to the conductors of the power wire 93. Note that the configuration of the power connector 23 also includes configurations other than those described above. However, in Figure 9, the circuit components mounted on the front (bottom) and back (top) surfaces of the printed circuit board 22 are not shown.

[0047] The power supply case 21 has a rectangular bottom wall 210 and a pair of first side walls 211 that protrude downward along the short direction of the bottom wall 210 from both ends in the longitudinal direction of the bottom wall 210. The power supply case 21 also has a pair of second side walls 212 that protrude downward along the longitudinal direction of the bottom wall 210 from both ends in the short direction of the bottom wall 210 (see Figures 6 and 9). In other words, the power supply case 21 is formed in the shape of a long box with an opening at the front (downward) of the bottom wall 210. The socket for the power connector 23 protrudes out of the power supply case 21 through a window hole provided in one of the first side walls 211 (see Figure 6).

[0048] The power supply unit 2 is attached to the bottom plate 30 of the support member 3 such that the opening of the power supply case 21 faces the second surface of the bottom plate 30, which is opposite to the first surface 30A of the bottom plate 30 (see Figures 6 and 9). The power supply case 21 is attached to the bottom plate 30 by appropriate methods such as screwing, crimping, or adhesive.

[0049] (2-2-6) Communication Unit The communication unit 4 includes a communication circuit section 40 and a communication connector 47 (see Figure 11). The communication circuit section 40 receives control signals transmitted via signal lines (not shown). The control signals are signals that transmit control information such as on / off instructions and dimming levels. The communication circuit section 40 is communicably connected to the control circuit 202 of the power supply unit 20 via the communication connector 47. The communication circuit section 40 transmits the control information contained in the received control signals to the control circuit 202 via the communication connector 47. The control circuit 202 performs actions such as turning on / off and changing the dimming level of the light source module 1 according to the control information received from the communication circuit section 40. However, the communication circuit section 40 may be configured to perform wireless communication using infrared or radio waves as the communication medium instead of wired communication.

[0050] The communication unit 4 is mounted in an appropriate location. For example, the communication unit 4 is mounted on the first side wall 211 of the power supply case 21 (the first side wall 211 opposite to the power connector 23), or on a part other than the power supply case 21, for example, on the support member 3.

[0051] (2-2-7) Cover The cover 5 comprises a cover body 50, an optical panel 56, and a cover end 54.

[0052] The cover body 50 has a top surface portion 511, an inner cover portion 512, and two side cover portions 52. Each side cover portion 52 has a side plate portion 53, a connecting portion 58, and an extension portion 55.

[0053] The top surface 511 is a flat, plate-like shape that is elongated in the longitudinal direction and has thickness in the vertical direction. The top surface 511 is transparent.

[0054] The side plate portions 53 are plate-shaped, elongated in the longitudinal direction and thickened in the transverse direction. Each side plate portion 53 extends upward from the transverse edge of the top surface portion 511. That is, the side plate portions 53 extend upward from each of the two transverse edges of the top surface portion 511. The two side plate portions 53 face each other in the transverse direction. Each side plate portion 53 is milky white and has light-diffusing properties.

[0055] Each side plate portion 53 has a first side plate portion 531 extending upward from the short edge of the top surface portion 511, and a second side plate portion 532 extending upward from the upper end of the first side plate portion 531. The vertical dimension of the first side plate portion 531 is smaller than the vertical dimension of the second side plate portion 532.

[0056] The first side plate portion 531 is flat, elongated in the longitudinal direction and thickened in the transverse direction. The first side plate portion 531 extends directly upward from the edge of the top surface portion 511 and is not inclined in the transverse direction. Therefore, the two first side plate portions 531 are parallel, and the distance between the two first side plate portions 531 does not change vertically. Note that "parallel" may include cases where they are not perfectly parallel but can be considered substantially parallel.

[0057] The second side plate portion 532 is flat, elongated in the longitudinal direction and thickened in the transverse direction. The second side plate portion 532 extends diagonally upward and outward from the upper end of the first side plate portion 531. That is, the first side plate portion 531 is inclined outward in the transverse direction as it goes upward, so the distance between the two second side plate portions 532 increases as it goes upward.

[0058] The inner cover portion 512 is flat, elongated in the longitudinal direction and thick in the vertical direction. The inner cover portion 512 is milky white and light-diffusing. The inner cover portion 512 is positioned above the top surface portion 511, facing the top surface portion 511 vertically. The inner cover portion 512 and the top surface portion 511 are parallel. Parallelism may include cases where they are not perfectly parallel but can be considered substantially parallel. The dimensions of the inner cover portion 512 in the short direction are the same as the dimensions of the top surface portion 511 in the short direction. Identical dimensions may include cases where they are not perfectly identical but can be considered substantially identical. The inner cover portion 512 is stretched between the two side plate portions 53. More specifically, the inner cover portion 512 spans between the position where the first side plate portion 531 and the second side plate portion 532 connect on one side plate portion 53 (i.e., the upper end of the first side plate portion 531 and the lower end of the second side plate portion 532) and the position where the first side plate portion 531 and the second side plate portion 532 connect on the other side plate portion 53 (i.e., the upper end of the first side plate portion 531 and the lower end of the second side plate portion 532). Therefore, the first side plate portion 531 is the portion of the side plate portion 53 that extends from the short-side edge of the top surface portion 511 to the short-side edge of the inner cover portion 512, and the second side plate portion 532 is the portion of the side plate portion 53 that extends upward from the short-side edge of the inner cover portion 512.

[0059] The cover body 50 does not have a member that spans between the two side cover portions 52 above the inner cover portion 512. In this embodiment, only the top portion 511 and the inner cover portion 512 span between the two side cover portions 52.

[0060] Between the top surface 511 and the inner cover 512, a storage space 572 is formed, enclosed by the top surface 511, the inner cover 512, and the two first side plate sections 531. The storage space 572 is long in the longitudinal direction and has a rectangular parallelepiped shape, with its short-side dimension being longer than its vertical dimension. In the cover body 50, both ends of the storage space 572 in the longitudinal direction are open.

[0061] The extension portion 55 is flat, elongated in the longitudinal direction and having thickness in the vertical direction. Each of the two extension portions 55 extends inward in the short direction from the upper end of the side plate portion 53 (the upper end of the second side plate portion 532). That is, the extension portion 55 extends inward in the short direction from the upper end of each side plate portion 53. There is a gap between the two extension portions 55 in the short direction.

[0062] Each extension 55 has a main piece 550, a connecting piece 551, and a side piece 552 (see Figure 6).

[0063] The connecting piece 551 is a long, flat plate in the longitudinal direction. The connecting piece 551 extends inward in the short direction from the upper end of the side plate portion 53 (the upper end of the second side plate portion 532).

[0064] The main piece 550 is a long, flat plate in the longitudinal direction. The main piece 550 has a base portion 554 that extends diagonally downward inward from the inner edge in the short direction of the connecting piece 551, and a reflector portion 553 that extends diagonally upward inward from the inner edge in the short direction of the base portion 554. As a result, the main piece 550 has a V-shape when viewed in the longitudinal direction.

[0065] The side piece 552 is a long, flat plate in the longitudinal direction. The side piece 552 extends upward from the inner edge of the main piece 550 in the short direction.

[0066] Each connecting portion 58 has a projection 581 and a hook portion 582.

[0067] The projection 581 is a long, flat plate in the longitudinal direction. Each projection 581 extends upward from the inner edge in the short direction of the connecting piece 551 of the extension 55. That is, the projection 581 extends upward from the inner edge in the short direction of each of the two connecting pieces 551.

[0068] The hook portion 582 is a long, flat plate in the longitudinal direction. Each hook portion 582 extends diagonally downward and inward from the upper edge of the projection 581. That is, each hook portion 582 extends diagonally downward and inward from the upper edge of the projection 581.

[0069] In this embodiment, the connecting portion 58 and the extension portion 55 are milky white and have light-diffusing properties.

[0070] The cover body 50 is made from a molding material containing a light-transmitting thermoplastic resin, such as acrylic resin or polycarbonate resin. In this embodiment, the inner cover portion 512, the side plate portion 53, the joint portion 58, and the extension portion 55 are milky white and have light-diffusing properties. The molding material for producing the milky white and light-diffusing portion contains, for example, a milky white thermoplastic resin or a light-diffusing filler. In this embodiment, the top surface portion 511 is transparent. The molding material for producing such a transparent portion contains a transparent thermoplastic resin and does not contain a light-diffusing filler.

[0071] In this embodiment, the side plate portion 53 and the inner cover portion 512 are integrated. "Integrated" means that they cannot be separated without being damaged when external force is applied. The entire cover body 50 may also be integrated.

[0072] The side plate portion 53 and the inner cover portion 512 may be integrated by adhesive bonding. The side plate portion 53 and the inner cover portion 512 may be integrated by mechanical elements such as screws.

[0073] In particular, it is preferable that the side plate portion 53 and the inner cover portion 512 are integrally molded. Integral molding means molding the product as a single unit at the same time as joining the components, without using secondary adhesive or mechanical bonding. The entire cover body 50 may also be integrally molded.

[0074] The cover body 50 is manufactured by integral molding, for example, by extrusion molding. If the cover body 50 has a milky white portion and a transparent portion, as in the embodiment, the cover body 50 can be manufactured by a multi-color molding method, for example, two-color extrusion molding.

[0075] The cover body 50 may be made of a light-transmitting material other than synthetic resin, such as inorganic glass like quartz glass.

[0076] The optical panel 56 is positioned within the housing space 572 in the cover body 50. The optical panel 56 is an optical component that transmits light. The optical panel 56 in this embodiment is flat, elongated in the longitudinal direction and having thickness in the vertical direction. The optical panel 56 in this embodiment can control the longitudinal light distribution of light that passes through the optical panel 56, then through the top surface 511, and exits to the outside of the cover 5. Specifically, the optical panel 56 can reduce the intensity of light that travels at an angle in the longitudinal direction among the light that passes through the optical panel 56, then through the top surface 511, and exits to the outside of the cover 5. As a result, it is possible to suppress the feeling of glare experienced by a person who views the lighting device at an angle along its longitudinal direction.

[0077] On the lower surface of the optical panel 56, a plurality of prisms 561 are formed, which protrude downward and are long in the short direction, arranged in the longitudinal direction (see Figure 13). The action of these prisms 561 controls the longitudinal distribution of light transmitted through the optical panel 56, and the intensity of light traveling at an angle in the longitudinal direction from the optical panel 56 can be reduced.

[0078] The two cover ends 54 are made from, for example, a material having the same light-transmitting properties as the cover body 50. Each cover end 54 is rectangular in shape when viewed longitudinally. One cover end 54 is attached to each of the longitudinal ends of the cover body 50. Each cover end 54 closes the openings at the longitudinal ends of the internal space 571 and the housing space 572 of the cover body 50.

[0079] The cover 5 is supported by the support member 3 (see Figure 6). With the cover 5 supported by the support member 3, the connecting portion 58 is connected to the support member 3 by hooking onto the support portion (support piece 31) from the outside in the short direction. The support member 3 is sandwiched in the short direction by the two connecting portions 58. Specifically, the support member 3 is positioned between the two connecting portions 58 on the cover 5. The projections 581 of the connecting portion 58 are positioned along the outside of each of the two support pieces 31 of the support member 3, and the hooking portion 582 of the connecting portion 58 is hooked onto the tip (upper end) of the support piece 31. In this way, the cover 5 is supported by the support member 3.

[0080] With the cover 5 supported by the support member 3, each extension 55 covers at least a portion of the first surface 30A of the bottom plate 30 of the support member 3 that is exposed to the outside of the light source module 1 (see Figure 6). The upper end of the side piece 552 contacts the first surface 30A of the bottom plate 30 of the support member 3 (see Figure 6). This prevents gaps from forming between the cover 5 and the support member 3, and can prevent foreign objects such as insects from passing through the gap between the cover 5 and the support member 3.

[0081] As the cover 5 is supported by the support member 3 in this manner, the opening between the two extensions 55 is closed by the support member 3. This creates an internal space 571 between the top surface 511 on the inside of the cover body 50 and the support member 3. In other words, viewed in the longitudinal direction, an internal space 571 is formed on the inside of the cover body 50, surrounded by the inner cover portion 512, the two side cover portions 52, and the support member 3. Furthermore, the second side plate portion 532 of each side plate portion 53 is interposed between the internal space 571 and the outside of the lighting device. That is, only the second side plate portion 532 is interposed between the portion of the internal space 571 facing the second side plate portion 532 and the outside of the lighting device.

[0082] The light source module 1, which is attached to the first surface 30A of the bottom plate 30 of the support member 3, is positioned between two extensions 55, facing the internal space 571 through the opening between the extensions 55. Therefore, the light-emitting element 10 in the light source module 1 is positioned facing the internal space 571 through the opening between the extensions 55, that is, it is positioned above the internal space 571. This allows the light-emitting element 10 of the light source module 1 to irradiate the internal space 571 with light.

[0083] The lighting device does not have any members in the internal space 571 that block light traveling in a straight line from the light source (light source module 1) toward the top surface 511 in a direction perpendicular to the longitudinal direction. Specifically, when the internal space 571 is viewed in the longitudinal direction, there are no members that block light between the imaginary line segment connecting the light-emitting element 10 and one edge of the inner cover portion 512 in the short direction and the imaginary line segment connecting the light-emitting element 10 and the other edge of the inner cover portion 512 in the short direction (see dashed line in Figure 6). Note that the longitudinal position of the connector 12 on the substrate 11 of the light source module 1 is offset from the longitudinal position of each light-emitting element 10, and therefore does not constitute a member that blocks light.

[0084] The surface of each extension 55 facing the internal space 571 of the reflective portion 553 constitutes a reflective surface 59. Similarly, the surface of the side piece 552 facing the internal space 571, together with the surface of the reflective portion 553 facing the internal space 571, can also constitute a reflective surface 59. In other words, the cover body 50 has two reflective surfaces 59. The reflective surfaces 59 are illuminated by light that does not travel directly from the light source to the inner cover portion 512, and at least a portion of this light is reflected toward the inner cover portion 512. In this embodiment, the two reflective surfaces 59 are arranged such that, viewed in the longitudinal direction, the light-emitting element 10 is positioned between the two reflective surfaces 59. Each of the two reflective surfaces 59, particularly the surface of the reflective portion 553 facing the internal space 571, is angled inward and downward. Each reflective surface 59 is located above a hypothetical line segment (see dashed line in Figure 6) connecting the light-emitting element 10 and the short edge of the inner cover portion 512. Furthermore, when viewed in the longitudinal direction, the position of the light-emitting portion of the light-emitting element 10 is below the virtual plane containing each reflective surface 59. Therefore, light is directly shone from the light-emitting element 10 toward the reflective surface 59, and at least a portion of this light can be reflected toward the inner cover portion 512.

[0085] (2-3) Installation of lighting fixtures Lighting fixture B1 is installed on the ceiling of the room using the following procedure.

[0086] First, as shown in Figure 12, the light source module 1 is attached to the support member 3 in the light source unit A1, and when the support member 3 and the cover 5 are separated, the cover 5 is attached to the support member 3 as shown in Figure 14. In this embodiment, the connecting part 58 is hooked onto the support part (support piece) from the outside in the short direction, thereby connecting the connecting part 58 to the support member 3, and the cover 5 is supported by the support member 3 as the support member 3 is sandwiched in the short direction by the two connecting parts 58.

[0087] When attaching the cover 5 to the support member 3, the worker pushes the cover 5 onto the support member 3, with the cover 5 positioned below the support member 3, so that the connecting portion 58 of the cover 5 is positioned on the outside of each of the two support pieces 31 of the support member 3 in the short direction. As a result, the tip of the hooking portion 582 rubs against the outer surface of the support piece 31, causing the connecting portion 58 to move upward relative to the support piece 31. The force applied to the connecting portion 58 from the support piece 31 in the short direction outwards causes the side cover portion 52 to deform so that it bends outwards in the short direction. When the tip of the hooking portion 582 reaches the upper end of the support piece 31, the force applied to the connecting portion 58 is removed, and the shape of the side cover portion 52 returns to its original state. As a result, as shown in Figure 14, the connecting portion 58 hooks onto the upper end of the support piece 31, and the cover 5 is supported by the support member 3.

[0088] In this embodiment, the inner cover portion 512 is stretched between the two side plate portions 53, and the cover body 50 does not have a member stretched between the two side cover portions 52 on the support member 3 side (i.e., above) of the inner cover portion 512. Therefore, when force is applied to the joint portion 58 from the support piece 31 when the cover 5 is attached to the support member 3, the side cover portion 52 deforms so as to bend, with the point where it connects to the inner cover portion 512 as a fulcrum. As a result, a large force is likely to be applied to the point where the side cover portion 52 connects to the inner cover portion 512. However, in this embodiment, since the side plate portion 53 and the inner cover portion 512 are integrated, damage to the cover body 50 is suppressed, and separation of the side cover portion 52 and the inner cover portion 512 can be suppressed. As a result, the optical panel 56 housed in the housing space 572 can also be suppressed from falling out of the cover body 50. In particular, if the inner cover portion 512 and the two side plate portions 53 are integrally molded, damage to the cover body 50 is further suppressed, and separation between the side cover portion 52 and the inner cover portion 512 can be further suppressed.

[0089] Furthermore, in this embodiment, the vertical dimension of the second side plate portion 532 is larger than the vertical dimension of the first side plate portion 531. That is, the dimension of the internal space 571 in the direction in which the top surface portion 511 and the support member 3 face each other (vertical dimension) is larger than the dimension of the housing space 572 in the direction in which the top surface portion 511 and the support member 3 face each other (vertical dimension). Therefore, even if the cover body 50 is equipped with an inner cover portion 512, the degree of deformation of the entire side cover portion 52 may be greater than the degree of deformation of the portion of the side cover portion 52 that connects to the inner cover portion 512. As a result, the force applied to the portion of the side plate portion 53 that connects to the inner cover portion 512 when the side cover portion 52 deforms can be kept low. This also helps to prevent damage to the cover body 50 and separation of the side cover portion 52 and the inner cover portion 512.

[0090] Furthermore, in this embodiment, the side plate portion 53 as a whole is inclined so that it moves outward in the short direction as it moves from the top surface portion 511 side towards the support member 3 side (i.e., upward). Specifically, of the first side plate portion 531 and the second side plate portion 532 that constitute the side plate portion 53, the first side plate portion 531 is not inclined in the short direction, but the second side plate portion 532 is inclined so that it moves outward in the short direction as it moves away from the top surface portion 511 (i.e., upward). As a result, the distance between the two second side plate portions 532 is greater towards the upper side. Therefore, when the side cover portion 52 deforms so as to bend outward with the point where it connects to the inner cover portion 512 as a fulcrum, the connecting portion 58 is more likely to move significantly outward in the short direction. This also helps to keep the force applied to the point where the side cover portion 52 connects to the inner cover portion 512 low.

[0091] The worker performing the installation pulls the power cable 92, which is drawn out from the ceiling S1, into the housing 60 through the central power hole 64 of the fixture body 6 (see Figure 2). The worker also pulls the signal wire, which is drawn out from the ceiling S1, into the housing 60 through the power hole 64 at the longitudinal end of the fixture body 6. Then, the worker inserts the two suspension bolts 90 provided in the ceiling S1 into the pair of mounting holes 63 of the fixture body 6, and attaches the fixture body 6 to the ceiling S1 by tightening nuts 91 on the suspension bolts 90 inserted into each mounting hole 63 via washers (not shown). After that, the worker electrically connects the power cable 92, which was pulled out from the central power hole 64, to the terminal block 65.

[0092] Next, as preparation for attaching the light source unit A1 to the fixture body 6, the worker inserts and holds the arms 381 of each of the two second hooking members 38 into the recesses 3930 of the temporary holding portion 393 of the mounting bracket 39 (see Figure 14). At this time, since the inner wall of the recess 3930 in the temporary holding portion 393 is inclined toward the recess 3930, the arms 381 can be guided toward the recess 3930. Therefore, the workability of the work of holding the arms 381 in the temporary holding portion 393 of the light source unit A1 can be improved. However, the arms 381 of each of the two second hooking members 38 may be inserted into the recesses 3930 of the temporary holding portion 393 of the mounting bracket 39 at the time of shipment. In that case, the above preparation work by the worker can be omitted, thereby reducing the workload on the worker and improving workability.

[0093] As the arm portion 381 is held by the temporary holding portion 393, the vertical space between the upper end of the wall portion of the light source unit A1 (the support piece 31 of the support member 3 and the projection 581 of the cover 5) and the arm portion 381 is increased. Furthermore, the worker slides the hook piece 372 of the first hooking member 37 until the rising piece 371 contacts the veneer 3911 of the mounting bracket 39 (see Figure 8).

[0094] Next, the worker inserts the hook piece 372 of the first hooking member 37 of the light source unit A1 into the hook hole 600 of the first hook fitting 603 of the fixture body 6, and hooks the tip of each hook piece 372 onto the edge of each hook hole 600 on the side wall of the housing 60, thereby temporarily suspending the light source unit A1 from the fixture body 6. In this temporarily suspended state, the worker electrically connects the power connector 94 at the end of the power line 93 connected to the terminal block 65 to the power connector 23 of the power unit 2 (see Figure 17), and also electrically connects the signal line to the communication unit 4.

[0095] Next, the worker inserts their finger into the space between the arm portion 381 and the projection 581 of the second hooking member 38 and pushes up the arm portion 381 with their finger, hooking the tip of the arm portion 381 onto the two second hook fittings 601 of the fixture body 6, one by one (see Figure 15). Then, the worker uses the hook piece 372, which is touching the edge of the hooking hole 600, as a pivot point and lifts the light source unit A1 while rotating it in the shorter direction. As a result, the deformed second hooking member 38 returns to its original shape, and the light source unit A1 is held by the fixture body 6 with the power supply unit 2 and communication unit 4 housed in the housing portion 60 by the first hooking member 37 hooked onto the edge of the hooking hole 600 and the second hooking member 38 hooked onto the second hook fitting 601 (see Figures 1 and 6).

[0096] The lighting fixture B1 is installed on the ceiling using the above procedure.

[0097] In this configuration, when the lighting fixture B1 is installed on the ceiling, the two suspension bolts 90, nuts 91, and washers (not shown) are all located between the power supply unit 2 and the communication unit 4 of the light source unit A1 in the longitudinal direction of the fixture body 6 (see Figures 9 and 10). In other words, the lighting fixture B1 has the advantage of being able to shorten its height (become thinner) because the two suspension bolts 90, nuts 91, and washers (not shown) and the power supply unit 2 and communication unit 4 do not overlap in the vertical direction.

[0098] Furthermore, in the fixture body 6, two second hook fittings 601 are positioned near the mounting holes 63. As a result, the distance between the position where the tightening force of the nut 91 is applied to the fixture body 6 (around the mounting holes 63 of the housing 60) and the position where the spring force of the second hook member 38 is applied to the fixture body 6 (the position of the second hook fittings 601) is shortened. Consequently, the lighting fixture B1 can suppress deflection along the longitudinal direction of the fixture body 6 and reduce the gap between the fixture body 6 and the light source unit A1 (and its cover 5).

[0099] In addition, multiple lighting fixtures B1 may be installed on the ceiling S1 in a line, with the end plates 62 of each fixture body 6 butting together. In this case, power cables 95 are routed between adjacent lighting fixtures B1 through holes formed by cutting out the knockout portions 620 of the end plates 62. In other words, two power cables 95 are electrically connected to the terminal block 65 of one lighting fixture B1 (see Figure 16). At this time, each power cable 95 is held in a cable holding portion 602 cut out from the bottom surface (underside) of the housing portion 60 (see Figure 16). However, the housing portion 60 does not necessarily have to have a cable holding portion 602. Here, the light source unit A1 has the power unit 2 positioned towards one end in the short direction of the support member 3 (see Figure 6). As a result, the light source unit A1 and the lighting fixture B1 have sufficient space to accommodate the power lines 93 connecting the terminal block 65 and the power supply unit 2, as well as the power cables 95 for daisy-chain wiring, thereby improving the workability of wiring.

[0100] (2-4) Advantages of the Embodiment When the lighting fixture is in use, the light-emitting element 10 emits light, and the light emitted from the light-emitting element 10 passes sequentially through the inner cover 512, the optical panel 56, and the top surface 511 before being radiated to the outside of the lighting fixture. Since the inner cover 512 is light-transmitting and light-diffusing, the light is diffused as it passes through the inner cover 512. As a result, from the outside of the lighting fixture, the entire top surface 511 appears to be emitting light, and the uniformity of the light emission intensity on the top surface 511 is enhanced.

[0101] In this embodiment, since the dimensions of the top surface 511 in the short direction and the dimensions of the inner cover 512 in the short direction are the same, light transmitted through the inner cover 512 is easily irradiated onto the entire top surface 511. As a result, the uniformity of the light emission intensity on the top surface 511 is further enhanced.

[0102] Furthermore, in this embodiment, the lighting device does not have any members in the internal space 571 that block light traveling in a straight line from the light source (light source module 1) toward the top surface 511 in a direction perpendicular to the longitudinal direction. Therefore, light emitted from the light-emitting element 10 toward the inner cover 512 can reach the inner cover 512 without being blocked. As a result, when the lighting device is observed from the outside, areas that appear dark due to light being blocked are less likely to occur on the top surface 511, and the uniformity of the light emission intensity on the top surface 511 is further improved.

[0103] Furthermore, at least a portion of the light emitted from the light-emitting element 10 toward the reflective surface 59 may be reflected by the reflective surface 59 toward the inner cover portion 512. This can increase the luminous efficiency of the lighting device.

[0104] Furthermore, in this embodiment, the optical panel 56 can control the longitudinal light distribution of the light that passes through the optical panel 56, then through the top surface 511, and exits the cover 5. Specifically, the optical panel 56 can reduce the intensity of the light that travels at an angle in the longitudinal direction among the light that passes through the optical panel 56, then through the top surface 511, and exits the cover 5. As a result, it is possible to suppress the feeling of glare experienced by people who view the lighting device at an angle along its longitudinal direction.

[0105] As described above, in this embodiment, when the lighting device is observed from the outside, the entire top surface 511 of the cover 5 appears to emit light uniformly.

[0106] Furthermore, in this embodiment, since only the second side plate portion 532 is interposed between the portion of the internal space 571 inside the cover body 50 that faces the second side plate portion 532 and the space outside the lighting device, heat from the internal space 571 is easily released to the outside of the lighting device through the second side plate portion 532. As a result, heat generated by the operation of the light source (light source module 1), etc., is easily released to the outside of the lighting device. This can improve the stability of the operation of the lighting device.

[0107] Furthermore, in this embodiment, the vertical dimension of the internal space 571 between the inner cover portion 512 and the support member 3 inside the cover body 50 is larger than the vertical dimension of the space (accommodation space 572) between the inner cover portion 512 and the top surface portion 511 inside the cover body 50. In other words, the volume of the internal space 571 is larger than the volume of the accommodation space 572. Therefore, even if the cover body 50 has an inner cover portion 512, a large volume of space (internal space 571) around the light source inside the cover body 50 can be secured. As a result, even if heat is generated when the light source (light source module 1), etc., operates, the temperature rise around the light source can be suppressed. This also contributes to improving the stability of the operation of the lighting device.

[0108] (3) Variant Next, several modifications of the light source unit A1 and lighting fixture B1 will be described. However, the basic configuration of the light source unit A1 and lighting fixture B1 in each of the modifications described below is the same as the basic configuration of the light source unit A1 and lighting fixture B1 in the embodiment. Therefore, components that are common or substantially common with the basic configuration of the light source unit A1 and lighting fixture B1 in the embodiment will be denoted by the same reference numerals, and their illustration and description will be omitted as appropriate. In the following description, "substantially common components" means components that differ slightly in shape, size, etc., but have the same function. Furthermore, each of the modifications described below can be appropriately combined with the embodiment and other modifications.

[0109] (3-1) Variation 1 Figure 18 shows Modification 1, in which the structure of the optical panel 56 is modified. The lower surface of the optical panel 56 in Modification 1 has multiple prisms, each consisting of a recess. The multiple prisms are arranged in a matrix. The surface of each prism has two inclined surfaces that are inclined in opposite directions with respect to the longitudinal direction, and two inclined surfaces that are inclined in opposite directions with respect to the short direction. The two inclined surfaces on each prism that are inclined with respect to the longitudinal direction control the light distribution of light transmitted through the optical panel 56 in the direction inclined in the longitudinal direction, thereby reducing the intensity of light traveling inclined in the longitudinal direction. This can suppress the feeling of glare experienced by a person viewing the lighting device at an angle along the longitudinal direction. In addition, the two inclined surfaces on each prism that are inclined with respect to the short direction also control the light distribution of light transmitted through the optical panel 56 in the direction inclined in the short direction, thereby reducing the intensity of light traveling inclined in the short direction. This can suppress the feeling of glare experienced by a person viewing the lighting device at an angle along the short direction.

[0110] (3-2) Modification example 2 In this embodiment, the top portion of the cover body 50 is transparent, and both the inner cover portion 512 and the side cover portion 52 of the cover body 50 are similarly milky white and have light-diffusing properties. However, the appearance color and optical properties of the cover body 50 are not limited to those described above.

[0111] For example, the visible light reflectance of the reflective surface 59 on the side cover portion 52 may be higher than that of the inner surface of the cover body 50 facing the internal space 571, excluding the reflective surface 59. In this case, the amount of light reflected by the reflective surface 59 and traveling to the inner cover portion 512 increases, which can further improve the luminous efficiency of the lighting device.

[0112] Furthermore, for example, the side plate portion 53 may or may not be light-transmitting.

[0113] If the side plate portion 53 is light-transmitting, the side plate portion 53 may be transparent, or it may be milky white and have light-diffusing properties. If the side plate portion 53 is light-transmitting, when the lighting device is observed from the outside, the side plate portion 53 will also appear to emit light.

[0114] If the side panel 53 is not light-transmitting, it may be possible to suppress the feeling of glare for people who view the lighting fixture at an angle. In this case, the side panel 53 may be milky white, or it may be a color other than milky white, such as black.

[0115] The visible light reflectivity of the inner surface of the side plate portion 53 facing the internal space 571 may be increased. In this case, the amount of light reflected by the side plate portion 53 and directed toward the inner cover portion 512 in the internal space 571 increases, which can increase the light emission intensity of the top surface portion 511. In other words, the inner surface of the side plate portion 53 facing the internal space 571 can function as a reflective surface 59.

[0116] The color of the parts included in the cover body 50, as well as the optical properties such as light transmittance, light diffusion, and light reflectivity, can be adjusted, for example, by making at least one of the content of light-diffusing filler and the type of filler in that part different from the rest of the cover body. In this case, for example, by manufacturing the cover body 50 by multi-color molding, the cover body 50 can be integrally molded while partially differentiating at least one of the content of light-diffusing filler and the type of filler in the cover body 50. Furthermore, for example, to increase the light reflectivity of surfaces such as the reflective surface 59 and the inner surface of the side plate portion 53, a light-reflective paint may be applied to these surfaces.

[0117] (3-3) Modification example 3 The lighting fixture B1 in Modification 3 is characterized by the structure of the fixture body 6. In Modification 1, the fixture body 6 is attached to the ceiling S1 so as to cover the recessed hole F1 provided in the ceiling S1 (see Figures 19 and 20).

[0118] As shown in Figure 20, the main body 6 of the device in modified example 2 includes a top plate unit 68 and a reflector unit 69.

[0119] The top plate unit 68 has a top plate 680 formed in the shape of a long rectangular flat plate, and a pair of side walls 681 that extend downward along the longitudinal direction of the top plate 680 from both ends in the short direction of the top plate 680. Preferably, the top plate unit 68 is formed integrally with the top plate 680 and the pair of side walls 681 by bending a metal plate, such as a galvanized steel plate. The top plate 680 has a plurality of mounting holes 63 and a plurality of power supply holes 64. A terminal block 65 is attached to the underside of the top plate 680. A plurality of power lines 93 are electrically connected to the terminal block 65. Power connectors 94 are attached to the ends of the plurality of power lines 93 (see Figure 20). Furthermore, a second hook fitting 601 is provided at each end in the longitudinal direction of the top plate 680. Furthermore, one groove 682 is provided at each of the longitudinal ends of one side wall 681, which serves as a hook hole 600 when the top plate unit 68 and the reflector unit 69 are joined together.

[0120] The reflector unit 69 includes a pair of first reflectors 691, a pair of second reflectors 692, a frame 693, and a pair of projections 694.

[0121] Each of the pair of first reflectors 691 is formed in the shape of a rectangular flat plate. A projection 694 protrudes upward from the upper end of each of the first reflectors 691. Each of the projections 694 is formed in the shape of an inverted L when viewed from the longitudinal direction (see Figure 20). Each of the pair of second reflectors 692 is formed in the shape of a trapezoidal flat plate (see Figure 20). Each of the two hypotenuses of the pair of second reflectors 692 is connected to the longitudinal end of the first reflector 691 (see Figure 20). The frame 693 is formed in the shape of a long rectangular frame. The frame 693 is connected to the lower ends of the pair of first reflectors 691 and the pair of second reflectors 692. In other words, the reflector unit 69 is formed in the shape of a long pyramidal truncated square with the top and bottom surfaces open.

[0122] The fixture body 6 is constructed by fixing a pair of projections 694 to a pair of side walls 681 and connecting the top plate unit 68 to the reflector unit 69. At both ends in the longitudinal direction of the fixture body 6, the area surrounded by the top plate unit 68 and the pair of second reflectors 692 is open.

[0123] In the modified example 3, the main body of the fixture 6 is inserted into a recessed hole F1 provided in the ceiling S1, and the top plate 680 of the top plate unit 68 is attached to a suspension bolt 90 hanging from the building structure. The frame 693 rests against the lower surface (ceiling surface) of the ceiling S1 from below, covering the edge of the recessed hole F1.

[0124] The light source unit A1 in Modification 3 is the same as the light source unit A1 in the embodiment. Therefore, the light source unit A1 is held to the fixture body 6 by the spring force of the hook piece 372 of the first hooking member 37 which is hooked onto the edge of the hooking hole 600, and the second hooking member 38 which is hooked onto the second hooking fitting 601, just as in the embodiment.

[0125] In Modification 3, the side plate portion 53 of the cover body 50 may be light-transmitting (see Modification 2). In this case, light transmitted through the side plate portion 53 and irradiated to the outside of the lighting device can be reflected by the first reflector 691 and radiated around the lighting device. As a result, light can be radiated over a wide area around the lighting device. Therefore, the space around the lighting device may feel brighter overall.

[0126] (3-4) Modification 4 The light source unit A1 may have a recess in the support piece 31 of the support member 3 at a position that overlaps with the bent portion 383 when viewed from the short side of the support member 3. In this case, the distance between the bent portion 383 of the arm portion 381 and the tip (upper end) of the support piece 31 can be extended. As a result, the light source unit A1 can be further improved in terms of ease of installation on the fixture body 6. The recess in the support piece 31 may be provided at the end of the support piece 31 in the longitudinal direction. The shape of the recess is not limited to a rectangle, and may be a shape other than a polygon, such as a semicircle.

[0127] The light source unit A1 may have the bent portion 383 of the arm portion 381 formed into a trapezoidal or arc-shaped form when viewed from the short side of the support member 3. In this case, the space between the bent portion 383 and the tip of the support piece 31 can be widened in the longitudinal direction of the support piece 31, thereby further improving the workability of the installation work on the fixture body 6. Instead of the bent portion 383, another member (for example, a string, cable tie, etc.) may be attached to the arm portion 381.

[0128] In the embodiment, the tip of the second hooking member 38 is bent into an L-shape (see Figures 12 and 14). If the tip of the arm 381 is not bent, when the arm 381 moves downward due to the spring force of the coil 380, there is a possibility that the bottom plate 30 may be scratched when the tip of the arm 381 collides with the bottom plate 30 or the like. In contrast, the second hooking member 38 in the embodiment reduces the possibility of the bottom plate 30 being scratched when the tip of the arm 381 collides with the bottom plate 30 or the like by bending the tip of the arm 381 into an L-shape. However, the tip of the arm 381 may be V-shaped, that is, bent at an acute angle, or the tip of the arm 381 may be bent at an obtuse angle. In the arm 381, a further bent portion may be provided between the bent portion 383 and the tip, bending in the opposite direction to the bent portion 383.

[0129] The tip of the arm portion 381 may be bent at an obtuse angle towards the coil portion 380, or it may be bent at an acute angle. Alternatively, the tip of the arm portion 381 may be curled outwards or inwards. Bending or curling the tip of the arm portion 381 further reduces the possibility of scratching the base plate 30 when the tip of the arm portion 381 collides with the base plate 30 or the like.

[0130] In the light source unit A1 according to this embodiment, the second hooking member 38 is attached to the support member 3 via a dedicated mounting bracket 39. However, instead of the dedicated mounting bracket 39, it may be attached to the support member 3 via another functional member such as a power supply case 21. The second hooking member 38 may also be attached directly to the support member 3. The second hooking member 38 may also be attached to the support member 3 via an appropriate mounting device other than the mounting bracket 39.

[0131] The shape of the temporary holding portion 393 is not limited to the embodiment. For example, if the upper surface of the temporary holding portion 393 on the side closer to the support piece 31 relative to the recess 3930 is an inclined surface, the arm portion 381 can be fitted into the recess 3930 by sliding it along the inclined surface. The temporary holding portion 393 may not have an inclined surface, or the entire upper surface of the temporary holding portion 3930, excluding the recess 3930, may be a flat surface. The upper surface of the temporary holding portion 393 on the side closer to the support piece 31 may be an inclined surface that slopes downward toward the recess 3930. The temporary holding portion 393 may have a rib that protrudes upward from the upper surface opposite to the support piece 31 relative to the recess 3930, in which case the rib can prevent the arm portion 381 fitted into the recess 3930 from coming out of the recess 3930.

[0132] In the second hooking member 38 of this embodiment, a torsion coil spring is used, but a leaf spring may be used instead of the torsion coil spring.

[0133] (3-5) Modification 5 The projection 34 on the support member 3 may have various shapes. For example, the projection 34 may be trough-shaped when viewed in the longitudinal direction, and may protrude outward to facilitate hooking of the hook portion 582. The bottom of the projection 34 may be formed to slope downward outward. The projection 34 may be formed in a V-shape. At least one of the inner side and outer side of the projection 34 may be formed to slope with respect to the thickness direction (vertical direction) of the bottom plate 30. The inner side of the projection 34 may be formed in a stepped shape. The tip (upper end) of the support piece 31 may be bent in an L-shape to facilitate hooking of the hook portion 582 of the projection 581. The outer side of the projection 34 may be formed in a stepped shape. At least one of the bottom, inner side, and outer side of the projection 34 may be formed to be inclined. The strength of the support member 3 may be improved by providing beads on the inside of each projection 34 on the bottom plate 30 of the support member 3. The support member 3 may have a support piece 31 at only one end in the shorter direction. The support member 3 may have only a bottom plate 30 without any support pieces 31. Two support pieces 31 may protrude from the support member 3 in different directions (upward and downward) in the thickness direction (vertical direction) of the bottom plate 30.

[0134] (3-6) Modification 6 In the light source unit A1, abnormal noises may occur due to the difference in thermal expansion coefficients between the metal support member 3 and the synthetic resin cover 5. Specifically, when the expansion and contraction forces of the synthetic resin cover 5, which has a relatively larger thermal expansion coefficient, exceed the maximum static friction force at the contact surface between the support member 3 and the cover 5, the strain that had been generated in the cover 5 is suddenly released. This sudden release of strain in the cover 5 generates friction noise accompanied by vibration at the contact surface between the cover 5 and the support member 3. This phenomenon is generally known as the stick-slip phenomenon. Furthermore, it is thought that abnormal noises due to the stick-slip phenomenon are more likely to occur the larger the contact area between the two members (support member 3 and cover 5).

[0135] Therefore, the tip (upper end) of the extension portion 55 of the cover 5 may be raised away from the first surface 30A of the support member 3 (the bottom plate 30) so as not to come into contact with it. In that case, the tip of the side piece 552 does not come into contact with the support member 3, thereby suppressing the generation of abnormal noise associated with the stick-slip phenomenon.

[0136] The extension portion 55 does not necessarily have a side piece 552. In this case, it is preferable that the tip of the main piece 550 of the extension portion 55 does not come into contact with the first surface 30A of the base plate 30, but it may come into contact. The portion of the main piece 550 of the extension portion 55 that is inside the projection 34 of the support member 3 may be formed to be substantially parallel to the first surface 30A of the base plate 30. The main piece 550 of the extension portion 55 may be directly connected to the cover body 50 without the connecting piece 551.

[0137] At least a portion of the extension 55 may be made from a different material (such as synthetic resin) than the other parts of the cover body 50 by multi-color molding or the like. For example, the entire extension 55 may be filled with filler to form a white color, while the other parts of the cover body 50 may be filled with less filler than the extension 55, or filled with a different filler to form a milky white color. The tip of the extension 55 may or may not contact the first surface 30A of the bottom plate 30 of the support member 3.

[0138] (3-7) Modification 7 The support member 3 may have a flat portion between the projection 34 and the support piece 31 that is parallel to the bottom plate 30 and located below the bottom plate 30. In this case, the cover 5 may have the tip of the extension 55 facing the substrate 11 of the light source module 1 with a gap between them, along the thickness direction (vertical direction) of the bottom plate 30. In this case, if the substrate 11 is fixed to the support member 3 with adhesive or the like, even if the adhesive peels off and the substrate falls, the extension 55 of the cover 5 will catch the substrate 11, thus preventing the substrate 11 from falling. Furthermore, if the extension 55 has a reflective function, the light extraction efficiency can be further improved. In addition, by not having the extension 55 and the substrate 11 come into contact, the generation of abnormal noise associated with the stick-slip phenomenon can be suppressed.

[0139] The bottom surface of the projection 34 of the support member 3 may be inclined upward toward the short end of the bottom plate 30. In this case, the end of the main piece 550 of the extension 55 of the cover 5 that is closer to the side piece 552 may be flat so as to be parallel to the bottom plate 30. Furthermore, the cover 5 may have a projection that protrudes upward from the tip of the hooking portion 582. However, the projection is not provided in a position that overlaps with the arm portion 381 of the second hooking member 38 in the short direction of the cover body 50. In this case, the light source unit A1 can improve the strength of the projection 581 while improving the workability of the installation work on the fixture body 6.

[0140] The cover 5 may have a projection that protrudes diagonally upward from the main piece 550 of the extension 55 toward the bottom plate 30 and is in contact with the projection 34. In this case, the projection may be provided along the entire length of the main piece 550, or on a portion of the main piece 550 in the longitudinal direction. This projection can suppress the movement of the support member 3 and the cover 5 from each other. The projection does not need to always be in contact with the projection 34; there may be a gap between the cover body 50 and the projection 34 that allows contact when the cover body 50 is deformed. The projection may protrude upward along the projection 34. The projection may also protrude in the opposite direction (towards the projection 34), in which case the tip (upper end) of the projection 5301 may be bent into an L shape. The projection may protrude from the main piece 550 along the thickness direction of the bottom plate 30, and the tip of the projection may be bent into a V shape. The main piece 550 of the extension 55 may be shortened so that the side piece 552 comes into contact with the side of the projection (the side opposite to the support piece 31).

[0141] The side surface of the projection 34, which extends from the bottom plate 30, may be formed to incline diagonally downward toward the support piece 31. In this case, the main piece 550 of the extension 55 may be directly connected to the cover body 50 without the connecting piece 551. In addition to the projection, the extension 55 may also be provided with a rib that protrudes upward from the upper surface of the main piece 550. The rib is formed to be able to contact the lower bottom surface of the projection 34. The rib may be provided along the entire length of the main piece 550, or on a portion of the length of the main piece 550. Such a rib can reduce the noise generated when the support member 3 and the cover 5 repeatedly come into contact and separate due to vibration, etc. Alternatively, or together with this rib, a rib that protrudes downward from the lower surface of the projection 34 of the support member 3 may be provided. The projection may protrude diagonally upward toward the light source module 1 from the main piece 550, or diagonally upward toward the projection 34 from the main piece 550.

[0142] The projection 34 may be formed in a V-shape, and the extension 55 may have a projection that protrudes diagonally upward from the main piece 550 so as to approach the projection 34. In this case, the projection can suppress the movement of the support member 3 and the cover 5 relative to each other.

[0143] The projection 34 may be formed in a semi-cylindrical shape. In this case, a part of the main piece 550 in the extension 55 (the part that connects to the connecting piece 551) may be curved so as to contact the projection 34. In this case, stress concentration on the main piece 550 from the projection 34 and the extension 55 can be reduced.

[0144] (3-8) Variation 8 The hook portion 582 may be formed to bend at approximately a right angle from the tip (upper end) of the projection 581, or to be formed to bend at an acute angle from the tip of the projection 581. The hook portion 582 may be formed in the shape of an inverted L, or in the shape of an inverted L with a part (upper part) curved upward.

[0145] (3-9) Modification 9 In the modified example 8, the extension portion 55 may not have a connecting piece 551, and the main piece 550 may be directly connected to the side plate portion 53. In this case, since the protrusions at both ends in the short direction of the cover 5 are eliminated, the light extraction efficiency in the short direction of the cover 5 can be improved.

[0146] (3-10) Variation 10 The projection 581 of the cover 5 may be attached to the support piece 31 of the support member 3 by appropriate fastening components. Examples of fastening components include stepped screws or rivets. The height of the support piece 31 may be greater than the height of the projection 581. In this case, it is desirable to partially reduce the height by providing a recess (notch) along the short side of the support member 3 at a position opposite the second hooking member 38.

[0147] (3-11) Variation 11 The entire support piece 31 of the support member 3 may be curled upward. The support member 3 may or may not have a projection 34. Furthermore, a recess may be provided at the base of the projection 581 of the cover 5 for fitting the curled support piece 31. The cover 5 may or may not have an extension 55. By fitting the curled support piece 31 into the recess, the cover 5 can be attached to the support member 3, thereby improving the workability of the installation process.

[0148] [Pattern] As shown in the embodiments and modifications, this disclosure includes the following aspects:

[0149] The first embodiment of the lighting device (light source unit A1) comprises a long light source, a support member (3) which is long in the longitudinal direction of the light source and supports the light source, and a cover (5) which is long in the longitudinal direction and is supported by the support member (3) so as to cover the light source. The cover (5) comprises a cover body (50) and an optical panel (56). The cover body (50) has a top surface (511), an inner cover part (512), and two side cover parts (52). The top surface (511) is flat, light-transmitting, and faces the support member (3) at a distance from it. The inner cover part (512) is flat, light-transmitting, and is positioned between the top surface (511) and the support member (3), and faces both the top surface (511) and the support member (3) at a distance from it. Each of the two side cover portions (52) has a side plate portion (53) extending from the short edge of the top surface portion (511) toward the support member (3), and a connecting portion (58) that is located closer to the support member (3) than the side plate portion (53) and is connected to the support member (3). The short direction is the direction perpendicular to both the direction in which the top surface portion (511) and the support member (3) face each other and the longitudinal direction. The inner cover portion (512) is stretched between the two side plate portions (53), and the inner cover portion (512) and the two side plate portions (53) are integral. The optical panel (56) is positioned between the top surface portion (511) and the inner cover portion (512) and controls the longitudinal light distribution of light that passes through the optical panel (56) and is emitted to the outside of the cover (5).

[0150] This embodiment has the advantage of suppressing glare for people who view the lighting device at an angle along its longitudinal direction, and also provides a lighting device that is easy to assemble.

[0151] In the second embodiment, the top surface (511) is transparent, as in the first embodiment.

[0152] According to this embodiment, the luminous efficiency of the top surface (511) can be increased.

[0153] In a third embodiment, the inner cover portion (512) has light-diffusing properties, as in the first or second embodiment.

[0154] According to this embodiment, the uniformity of the light emission intensity on the top surface (511) can be improved.

[0155] In the fourth embodiment, the inner cover portion (512) and the two side plate portions (53) are integrally molded together in any one of the first to third embodiments.

[0156] In this case, the ease of assembly of the lighting device can be improved.

[0157] In the fifth embodiment, in any one of the first to fourth embodiments, the dimension of the top surface (511) in the short-side direction and the dimension of the inner cover (512) in the short-side direction are the same.

[0158] According to this embodiment, the uniformity of the light emission intensity on the top surface (511) can be improved.

[0159] In the sixth embodiment, in any one of the first to fifth embodiments, the lighting device does not have a member in the internal space (571) between the top surface (511) of the cover (5) and the support member (3) that blocks light traveling in a straight line from the light source toward the top surface (511) in a direction perpendicular to the longitudinal direction.

[0160] According to this embodiment, the uniformity of the light emission intensity on the top surface (511) can be improved.

[0161] In the seventh embodiment, in any one of the first to sixth embodiments, the cover body (50) has a reflective surface (59) facing the internal space (571) between the top surface (511) and the support member (3) on the inside of the cover body (50). The reflective surface (59) is illuminated by light that does not travel in a straight line from the light source to the inner cover portion (512), and reflects at least a portion of the light toward the inner cover portion (512).

[0162] According to this embodiment, the luminous efficiency of the top surface (511) can be increased.

[0163] In the eighth embodiment, in any one of the first to seventh embodiments, the side plate portion (53) has a first side plate portion (531) extending from the short edge of the top surface portion (511) to the short edge of the inner cover portion (512), and a second side plate portion (532) extending from the edge of the inner cover portion (512) to the opposite side from the top surface portion (511). In the internal space (571) between the inner cover portion (512) and the support member 3 inside the cover body (50), only the second side plate portion (532) is interposed between the portion facing the second side plate portion (532) and the space outside the lighting device.

[0164] According to this embodiment, heat emitted by the light source, etc., is more easily released to the outside through the second side plate portion (532), which can improve the reliability of the operation of the lighting device.

[0165] In the ninth embodiment, in any one of the first to eighth embodiments, the dimension of the internal space (571) between the inner cover portion (512) and the support member (3) inside the cover body (50) in the direction in which the top surface portion (511) and the support member (3) face each other is larger than the dimension of the space between the inner cover portion (512) and the top surface portion (511) inside the cover body (50) in the direction in which the top surface portion (511) and the support member (3) face each other.

[0166] According to this embodiment, the temperature rise in the internal space (571) due to heat emitted by the light source, etc., can be suppressed, and the reliability of the operation of the lighting device can be improved.

[0167] In the tenth embodiment, in any one of the first to ninth embodiments, the side plate portion (53) is light-transmitting.

[0168] According to this embodiment, light can be irradiated over a wide area around the lighting device.

[0169] In the eleventh embodiment, in any one of the first to ninth embodiments, the side plate portion (53) is not light-transmitting.

[0170] According to this embodiment, the feeling of glare when the lighting fixture is viewed from an oblique angle can be suppressed. [Explanation of symbols]

[0171] A1 Light source unit (lighting device) 1. Light source module (light source) 3. Support member 5 Cover 50 Cover body 511 Top section 512 Inner cover section 52 Side cover section 53 Side plate part 531 1st side plate part 532 2nd side plate part 56 Optical Panels 571 Interior space 572 Containment space (space) 58 Joint 59 Reflective surface

Claims

1. A long light source, A support member, which is elongated in the longitudinal direction of the light source, supports the light source. The light source is covered by the support member, and the cover is elongated in the longitudinal direction, and is supported by the support member. The cover comprises a cover body and an optical panel. The cover body has a top surface, an inner cover, and two side cover sections. The aforementioned top surface is flat, has light-transmitting properties, and faces the support member at a distance from it. The inner cover portion is flat, light-transmitting, positioned between the top surface portion and the support member, and facing both the top surface portion and the support member with a gap between them. Each of the two side cover portions has a side plate portion extending from the short edge of the top surface portion toward the support member, and a connecting portion located toward the support member than the side plate portion and connected to the support member, wherein the short direction is a direction perpendicular to both the direction in which the top surface portion and the support member face each other and the longitudinal direction. The inner cover portion is stretched between the two side plate portions, and the inner cover portion and the two side plate portions are integrally formed. The optical panel is positioned between the top surface and the inner cover and controls the longitudinal distribution of light that passes through the optical panel and exits to the outside of the cover. Lighting device.

2. The top surface is transparent. The lighting device according to claim 1.

3. The inner cover portion has light-diffusing properties. The lighting device according to claim 1.

4. The inner cover portion and the two side plate portions are integrally molded together, thus forming a single unit. The lighting device according to claim 1.

5. The dimensions of the top surface portion in the short direction and the dimensions of the inner cover portion in the short direction are the same. The lighting device according to claim 1.

6. The internal space between the top surface and the support member of the cover does not contain a member that blocks light traveling in a straight line from the light source toward the top surface in a direction perpendicular to the longitudinal direction. The lighting device according to claim 1.

7. The cover body has a reflective surface facing the internal space between the top surface and the support member on the inside of the cover body, and the reflective surface is illuminated by light that does not travel in a straight line from the light source to the inner cover portion, and reflects at least a portion of the light toward the inner cover portion. The lighting device according to claim 1.

8. The side plate portion has a first side plate portion extending from the short edge of the top surface portion to the short edge of the inner cover portion, and a second side plate portion extending from the edge of the inner cover portion to the side opposite to the top surface portion. In the internal space between the inner cover portion and the support member inside the cover body, only the second side plate portion is interposed between the portion facing the second side plate portion and the space outside the lighting device. The lighting device according to claim 1.

9. The dimension of the internal space between the inner cover portion and the support member inside the cover body, in the direction in which the top surface portion and the support member face each other, is larger than the dimension of the space between the inner cover portion and the top surface portion inside the cover body, in the direction in which the top surface portion and the support member face each other. The lighting device according to claim 1.

10. The side plate portion has light transmittance, The lighting device according to claim 1.

11. The aforementioned side plate portion does not transmit light. The lighting device according to claim 1.

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