Lighting device

Abstract

To provide a lighting device which can be mounted at an inclination angle corresponding to a sloped ceiling having a large angle and can stably maintain mounting to the sloped ceiling.SOLUTION: The lighting device includes a fixing bracket immovably attached to a ceiling, and a tilting bracket for tiltably attaching a lighting device body to the fixing bracket, wherein the fixing bracket has a fixing bracket slit extending in a longitudinal direction, the tilting bracket is immovably attached to the lighting device body and has a rotation center axis hole and a guide slit for limiting a rotation angle, and the rotation center axis hole includes a first rotation center axis hole provided at a position offset from a virtual plane that is perpendicular to the fixing bracket and passes through a center axis of the lighting device body. In the lighting device, the lighting device body can be mounted inclined to the vertical direction by screw-fastening the fixing metal fitting slit to the rotation center shaft hole and screw-fastening the fixing metal fitting slit to an arbitrary position of the guide slit.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a lighting device used as stage lighting in various performance spaces such as concert halls, stages, exhibition halls, and banquet halls, and more particularly to a downlight that is semi-fixedly installed facing downward on the ceiling of a concert hall or stage. [Background technology]

[0002] BACKGROUND ART Downlights that are semi-fixedly installed on the ceiling of a studio or stage and point downward are known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-318727 Summary of the Invention [Problem to be solved by the invention]

[0004] The downlight described in Patent Document 1 is attached via a baton device placed in a space close to the ceiling. However, from a performance perspective, the presence of a large baton device is undesirable, and in some cases it is preferred to attach the downlight directly to the ceiling using only a small fixing bracket.

[0005] Fig. 6 shows a conventional downlight that is directly attached to a ceiling via fixing brackets. Fig. 6(a) is a front view, Fig. 6(b) is a side view, Fig. 6(c) is a bottom view, and Fig. 6(d) is a front view with the fixing brackets removed. As shown in Fig. 6(b), the conventional downlight 1P includes two fixing brackets 3, 3 that are immovably attached to the ceiling, and two tilting brackets 5, 5 for tilting the lighting device main body 2 relative to the fixing brackets 3. As shown in Fig. 6(a), the fixing bracket 3 has a fixing bracket slit 4 extending in the longitudinal direction, and the tilting bracket 5 is immovably attached to the lighting device main body 2 and has a rotation center shaft hole 6 and a guide slit 7 that limits the rotation angle (see also Fig. 6(d)). The fixing bracket slit 4 is fastened to the rotation center shaft hole 6 with a screw Sc, and the fixing bracket slit 4 is fastened to any position on the guide slit 7 with a screw Sc according to the desired tilt angle, so that the lighting device main body 2 can be installed tilted relative to the vertical direction.

[0006] The reason why the lighting device main body 2 is configured to be tiltable relative to the vertical direction is that sloped ceilings are often used in stages and concert halls to prevent flutter echoes (multiple reflections of sound), and downlights can be installed at an appropriate angle relative to the sloped ceiling (see also Figures 5(a) and 5(b)). Therefore, even though downlights are tiltable, they are not like spotlights that constantly change direction to illuminate according to the performance, but rather, once the angle is determined, that angle is maintained semi-fixedly.

[0007] Figure 7 shows how a conventional downlight is installed at its maximum tilt, with Figure 7(a) being a front view, Figure 7(b) being a side view, and Figure 7(c) being a bottom view. Figure 7(d) is a front view showing the fixture in a vertical position. As shown in Figures 7(a) and 7(d), the tilt angle is limited to the range where the upper screw Sc abuts against the right end of the guide slit 7. In this example, the tilt angle is limited to approximately 20 degrees.

[0008] Incidentally, for ceilings of concert halls and stages, steeper sloped ceilings are sometimes adopted for better acoustics or to enhance the performance effect, with some having slopes approaching 40 degrees. To maintain conventional techniques for a steeply sloped ceiling without significantly changing the conventional method, it is necessary to increase the limiting range of the guide slit 7 or reduce the distance between the rotation center shaft hole 6 and the guide slit 7 in order to increase the tilt rotation angle. However, increasing the limiting range of the guide slit 7 would result in the device itself becoming larger and heavier. Furthermore, reducing the distance between the rotation center shaft hole 6 and the guide slit 7, or even more drastically eliminating the guide slit 7 entirely and fastening the device at a single point, would require the moment force acting on the rotation center shaft hole 6 to be suppressed solely by friction at the center of the axis. However, due to limitations in friction, there is a risk that the angle once set may shift due to vibration or external forces.

[0009] The present invention addresses these problems by providing a lighting device that can be installed at an angle that corresponds to a large sloped ceiling while maintaining a compact size, and that can maintain stable installation on a sloped ceiling. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, the lighting device of the present invention is a lighting device that is attached to a ceiling or a sloped ceiling, and comprises two fixing brackets that are immovably attached to the ceiling or sloped ceiling, and two tilting brackets for tilting the lighting device body relative to the fixing brackets, the fixing brackets have fixing bracket slits extending in the longitudinal direction, the tilting brackets are immovably attached to the lighting device body, and have a rotation center shaft hole and a guide slit that limits the rotation angle, the rotation center shaft hole includes a first rotation center shaft hole that is located in a plane perpendicular to the tilting brackets and at a position offset from an imaginary plane that passes through the central axis of the lighting device body, and by screwing the fixing bracket slits to the rotation center shaft hole and screwing the fixing bracket slits to any position on the guide slits, the lighting device body can be attached at an angle relative to the vertical direction. [Brief explanation of the drawings]

[0011] [Figure 1] 1A to 1D are diagrams showing an illumination device according to a first embodiment of the present invention, in which FIG. 1A is a front view, FIG. 1B is a side view, FIG. 1C is a bottom view, and FIG. 1D is a perspective view in a state where a fixing bracket is removed. [Figure 2] 2(a) and 2(b) are diagrams showing a lighting device according to a second embodiment of the present invention, in which FIG. 2(a) is a front view, FIG. 2(b) is a front view with the fixing bracket removed, FIG. 2(c) is a front view showing the state in which the fixing bracket is held vertical, and FIG. 2(d) is a front view showing the state in which the fixing bracket is fixed to the second rotation center axis hole and held vertical. [Figure 3] 3(a) is a front view of the lighting device according to the third embodiment of the present invention with the fixture removed, FIG. 3(b) is a front view of the lighting device according to the third embodiment with the fixture held vertical, and FIG. 3(c) is a front view of the lighting device according to the first embodiment with the fixture held vertically in the third rotation center shaft hole. FIG. 3(d) is a front view of the lighting device according to the first embodiment, presented for comparison. [Figure 4]4A and 4B are diagrams showing a lighting device according to a fourth embodiment of the present invention, in which FIG. 4A is a front view with the fixing bracket removed, FIG. 4B is a front view showing the device fixed to the third rotation center shaft hole, FIG. 4C is a front view showing the device fixed to the first rotation center shaft hole, and FIG. 4D is a front view showing the device fixed to the second rotation center shaft hole. [Figure 5] 5A and 5B are diagrams illustrating the state in which a lighting device according to a fourth embodiment of the present invention is attached to the sloped ceiling of a theater, where FIG. 5A is a side cross-sectional view of the entire theater, FIG. 5B is an overhead view of the entire theater, and FIG. 5C is an enlarged view of part A in FIG. 5A. [Figure 6] 6(a) and 6(b) are diagrams showing a conventional downlight, in which FIG. 6(a) is a front view, FIG. 6(b) is a side view, FIG. 6(c) is a bottom view, and FIG. 6(d) is a front view with the fixing bracket removed. [Figure 7] These figures show how a conventional downlight looks when installed at its maximum tilt, with Figure 7(a) being a front view, Figure 7(b) being a side view, Figure 7(c) being a bottom view, and Figure 7(d) being a front view showing the fixture in a vertical position. DETAILED DESCRIPTION OF THE INVENTION

[0012] An example of an embodiment of a lighting device according to the present invention will be described below with reference to the drawings. However, the drawings have been created for explanatory purposes, and for the sake of clarity, components not necessary for the explanation may be intentionally omitted. Furthermore, components may be intentionally enlarged or reduced in size for the purpose of explanation, and the drawings are not drawn to an accurate scale. In the following description, the same reference numerals in different drawings indicate parts with the same function, and duplicate explanations in each drawing will be omitted as appropriate.

[0013] First Embodiment FIG. 1 shows a lighting device according to a first embodiment of the present invention, where FIG. 1(a) is a front view, FIG. 1(b) is a side view, FIG. 1(c) is a bottom view, and FIG. 1(d) is a perspective view, with the fixing brackets removed.

[0014] (Overall configuration of lighting equipment) The lighting device 1 according to the first embodiment of the present invention comprises a lower housing 21 of the lighting device main body 2 and a heat dissipation unit 22. The lower housing 21 houses an LED light source, a light source control circuit that drives the LED light source, and a power supply circuit that supplies power to the light source control circuit (the LED light source and various circuits are not shown). The bottom surface of the lower housing 21 is provided with a condenser lens 211 that condenses light and emits it to the outside. The upper side of the lower housing 21 is provided with an inclined bracket 5 for fixing the lighting device main body 2 at an angle relative to the fixing bracket 3 (described below), and a fall prevention wire mounting bracket 8. The fall prevention wire mounting bracket 8 has an attached wire that can be attached to a building structure such as the eaves or beams of the ceiling to prevent the lighting device 1 from falling to the floor. The heat dissipation unit 22 has a heat sink structure that dissipates heat generated by the LED light source, light source control circuit, etc., and in this embodiment, is provided with multiple pin fins. However, the fins may also be configured with multiple rows of vertical fins.

[0015] An LED light source device uses a light-emitting diode (LED) as a light source. The LED can be a typical LED, such as a power LED or a bullet-type LED, which is compact, resistant to vibration and shock, robust, reliable, generates little heat, has a long life, has a luminous efficiency four times higher than that of an incandescent bulb, has good color rendering, and has a narrow directivity angle. Depending on the desired lighting effect, white, blue, or red LEDs can be selectively used. However, considering versatility and brightness, white LEDs are preferred. White LEDs are a type of PN junction diode made of compound semiconductors using InGaN / YAG as the material. When a current is passed through the diode and carriers are injected into the junction, the material itself emits white light. Preferably, a white LED with a brightness of 40 lumens or more and an operating voltage of 3.8V or more is used.

[0016] An LED light source device is formed by arranging multiple such light-emitting diodes in parallel on a flat plate in an arrangement such as vertical and horizontal, vertical and horizontal diagonal, staggered, or honeycomb, and emitting light downward from each light-emitting diode to provide the desired light intensity. The light-emitting diodes used, their number, and arrangement pattern are selected as appropriate depending on various conditions such as the brightness, irradiation distance range, and irradiation diameter required in accordance with the usage situation of the lighting device 1.

[0017] The light source control circuit drives the LED light source device and is a DC-DC converter that controls the light by controlling the current and duty ratio using a PWM signal to a switching element such as a MOSFET. The light source control circuit is supplied with DC power converted by the power supply circuit. The power supply circuit has an inverter that converts AC supplied from the power grid to DC.

[0018] (Configuration for fixing lighting device) The lighting device 1 according to the first embodiment of the present invention is a lighting device that can be attached to a ceiling or a sloped ceiling, and is particularly a downlight that can be attached to a ceiling with a large slope. That is, as shown in Fig. 1(b), the lighting device 1 includes two fixing brackets 3,3 that are immovably attached to the ceiling, and two tilting brackets 5,5 for tiltably attaching the lighting device main body 2 to the fixing brackets 3,3.

[0019] The fixing bracket 3 is L-shaped in side view and is composed of a long side portion 31 and a bottom side portion 32. The long side portion 31 has a fixing bracket slit 4 extending in the longitudinal direction. The fixing bracket slit 4 is used for fastening to the diagonal bracket 5 with a screw Sc. The bottom side portion 32 is connected and fixed to the skeleton structure inside the ceiling via an appropriate relay member.

[0020] As shown in FIGS. 1(a) and 1(d), the tilting bracket 5 is attached immovably to the lighting device main body 2, and has a rotation center shaft hole 6 and a guide slit 7 that limits the rotation angle.

[0021] In the first embodiment, the rotation center shaft hole 6 is a first rotation center shaft hole 61 provided in a position offset from an imaginary plane that is perpendicular to the tilting bracket 5 and passes through the central axis of the lighting device body 2.

[0022] The fixing bracket slit 4 is loosely fastened to the first rotation center shaft hole 61 with a screw Sc, and the inclination angle of the lighting device 1 is determined while rotating it around the first rotation center shaft hole 61.Then, at the position of the corresponding guide slit 7, two screws Sc shown in Figure 1(b) are fastened to the fixing bracket slit 4, and the lighting device body is fixed at an incline with respect to the vertical direction.

[0023] In the conventional example shown in FIG. 6 , the rotation center shaft hole 6 is located on a virtual plane that is perpendicular to the tilting bracket 5 and passes through the central axis of the lighting device main body 2, so the tilt range is limited to approximately 20 degrees left and right due to the range restricted by the guide slit 7. In the lighting device 1 according to the first embodiment shown in FIG. 1 , the first rotation center shaft hole 61 is located at a position offset from a virtual plane that is perpendicular to the tilting bracket 5 and passes through the central axis of the lighting device main body 2, so the tilt range can be wide, from 7 degrees to 40 degrees, and it can be installed on sloped ceilings with large angles. Note that the reason the movable range does not start from 0 degrees is because the guide slit 7 is the same size as in the conventional example, in order to reduce costs. That is, when the lighting device is pointed directly downward in the conventional example, the upper screw Sc is located in the center of the guide slit 7 as shown in FIG. 6( a), which causes no problem. However, in the first embodiment, when the lighting device is pointed directly downward, the upper screw Sc is restricted to the left end of the guide slit 7 (see also FIG. 3( d)). However, by slightly increasing the restricted range of the guide slit 7, it is possible to make the movable range start from 0 degrees, and in the third embodiment, a different configuration is used to enable the lighting device to be directed directly downward, as will be described later.

[0024] Second Embodiment 2A and 2B are diagrams showing a lighting device according to a second embodiment of the present invention, in which FIG. 2A is a front view, FIG. 2B is a front view with the fixing bracket removed, FIG. 2C is a front view showing the lighting device with the fixing bracket held vertical, and FIG. 2D is a front view showing the lighting device fixed to the second rotation center axis hole and the fixing bracket held vertical.

[0025] The overall configuration of the lighting device 1A of the second embodiment is the same as that of the lighting device 1 of the first embodiment, that is, a downlight. That is, the lighting device 1A is composed of a lower housing 21 of the lighting device main body 2 and a heat dissipation section 22. The lower housing 21 houses an LED light source device and various circuits, the bottom surface of the lower housing 21 is provided with a condenser lens 211 that condenses light and emits it to the outside, and the upper side surface of the lower housing 21 is provided with a tilting bracket 5 for fixing the lighting device main body 2 at an angle relative to the fixing bracket 3, and a fall prevention wire mounting bracket 8.

[0026] However, unlike the first embodiment, the lighting device 1A of the second embodiment has two rotation center shaft holes 6 of the tilting bracket 5: a first rotation center shaft hole 61 and a second rotation center shaft hole 62. Specifically, as shown in Fig. 2(b), in addition to the first rotation center shaft hole 61 provided at a position offset from an imaginary plane that is perpendicular to the tilting bracket 5 and passes through the central axis of the lighting device main body 2, the tilting bracket 5 has a second rotation center shaft hole 62 at an offset position on the opposite side of the imaginary plane from the first rotation center shaft hole 61.

[0027] As shown in Figure 2(c), it is often advantageous to position the rotation center on the side opposite to the side where the fall-prevention wire mounting bracket 8 is located, as this will not interfere with a sloped ceiling with a large angle. For this reason, the first rotation center shaft hole 61 is provided on the side opposite to the side where the fall-prevention wire mounting bracket 8 is located. However, depending on the shape of the ceiling, the fall-prevention wire mounting bracket 8 may interfere. Therefore, in the second embodiment, a second rotation center shaft hole 62 is provided at an offset position on the opposite side to the first rotation center shaft hole 61.

[0028] As shown in Figures 2(c) and 2(d), by selecting any mounting method that does not interfere with the fall prevention wire mounting bracket 8, it is possible to mount the lighting device on sloped ceilings of various shapes.

[0029] Third Embodiment Fig. 3 shows a lighting device according to a third embodiment of the present invention, with Fig. 3(a) being a front view with the fixture removed, Fig. 3(b) being a front view with the fixture held vertical, and Fig. 3(c) being a front view with the lighting device fixed to the third rotation center shaft hole and not angled (0 degrees) relative to the fixture. For comparison, Fig. 3(d) shows a front view of the lighting device according to the first embodiment.

[0030] The overall configuration of the lighting device 1B of the third embodiment is the same as that of the lighting device 1 of the first embodiment, that is, a downlight. That is, the lighting device 1B is composed of a lower housing 21 of the lighting device main body 2 and a heat dissipation section 22, the lower housing 21 houses an LED light source device and various circuits, the bottom surface of the lower housing 21 is provided with a condenser lens 211 that condenses light and emits it to the outside, and the upper side surface of the lower housing 21 is provided with a tilting bracket 5 for fixing the lighting device main body 2 at an angle relative to the fixing bracket 3, and a fall prevention wire mounting bracket 8.

[0031] However, unlike the first embodiment, the lighting device 1B of the third embodiment has two rotation center shaft holes 6 of the tilting bracket 5: a first rotation center shaft hole 61 and a third rotation center shaft hole 63. Specifically, as shown in Fig. 3(a), in addition to the first rotation center shaft hole 61 provided in a position offset from an imaginary plane that is perpendicular to the tilting bracket 5 and passes through the central axis of the lighting device main body 2, the tilting bracket 5 has a third rotation center shaft hole 63 provided on the imaginary plane.

[0032] As mentioned above, the first rotation center shaft hole 61 enables the lighting device to be attached to a sloped ceiling with a large angle. However, as shown in FIG. 3(d), the upper screw Sc is restricted to the left end of the guide slit 7, so the lower limit of the tilt range of the lighting device is limited to about 7 degrees. However, from the perspective of versatility, it would be more convenient if the lighting device could be attached to a flat ceiling with no slope. Therefore, in the third embodiment, a third rotation center shaft hole 63 is provided on an imaginary plane passing through the central axis of the lighting device main body 2.

[0033] When installing the lighting device on a sloped ceiling with a large angle, the fixing bracket 3 is attached to the first rotation center shaft hole 61 as shown in Fig. 3(b), and when installing the lighting device on a horizontal ceiling or a sloped ceiling with a small angle, the fixing bracket 3 is attached to the third rotation center shaft hole 63 as shown in Fig. 3(c). Because the tilt range that the first rotation center shaft hole 61 can take and the tilt range that the third rotation center shaft hole 63 can take overlap, it is possible to install the lighting device 1B to correspond to sloped ceilings with various angles.

[0034] <Fourth embodiment> Figure 4 shows a lighting device according to a fourth embodiment of the present invention, where Figure 4(a) is a front view with the fixing bracket removed, Figure 4(b) is a front view showing the lighting device fixed to the third rotation center shaft hole, Figure 4(c) is a front view showing the lighting device fixed to the first rotation center shaft hole, and Figure 4(d) is a front view showing the lighting device fixed to the second rotation center shaft hole.

[0035] The lighting device 1C of the fourth embodiment is a downlight that combines the features of both the lighting device 1A and the lighting device 1B. That is, the rotation center shaft hole 6 of the tilting bracket 5 is composed of three rotation center shaft holes. Specifically, as shown in Fig. 4(a), the tilting bracket 5 has a first rotation center shaft hole 61 provided in a position offset from an imaginary plane that is perpendicular to the tilting bracket 5 and passes through the central axis of the lighting device main body 2, a second rotation center shaft hole 62 provided in an offset position on the opposite side, and a third rotation center shaft hole 63 provided on the imaginary plane.

[0036] When installing the lighting device on a horizontal ceiling or a sloped ceiling with a small angle, the fixing bracket 3 is attached to the third rotation center shaft hole 63 as shown in Figure 4(b). When installing the lighting device on a sloped ceiling with a large angle, the fixing bracket 3 is attached to the first rotation center shaft hole 61 or the second rotation center shaft hole 62 as shown in Figure 4(c) or Figure 4(d), depending on the shape of the sloped ceiling.

[0037] (Installation on a sloped ceiling) FIG. 5 illustrates a lighting device according to a fourth embodiment of the present invention installed on a sloped ceiling of a theater. FIG. 5(a) is a side cross-sectional view of the entire theater, FIG. 5(b) is a bird's-eye view of the entire theater, and FIG. 5(c) is an enlarged view of portion A in FIG. 5(a). As shown in FIG. 5(a), the sloped ceiling has an inclination of more than 20 degrees, approaching 40 degrees. Conventional downlights 1P could not be installed facing directly downward on such a ceiling. However, as shown in FIG. 5(c), lighting device 1C according to the fourth embodiment of the present invention can be installed facing directly downward without any problems. The lighting device 1 according to the first embodiment, lighting device 1A according to the second embodiment, and lighting device 1B according to the third embodiment can also be installed facing directly downward.

[0038] (Installation on a movable ceiling) A movable ceiling reflector that functions as an acoustic reflector is sometimes installed above a theater stage. When a downlight is mounted on this ceiling reflector, the ceiling reflector is repeatedly moved. If the lighting device maintains its tilt angle solely through friction at the axis center with a single-point fastening, the fastening part will gradually loosen, eventually causing the downlight's tilt angle to shift. In the lighting devices according to the first to fourth embodiments of the present invention, the tilt angle is firmly fixed by screws fastened at two points, so the tilt angle can be stably maintained even when the lighting device is mounted on a movable ceiling.

[0039] Although the lighting device according to each embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also encompasses design changes within the scope of the present invention. For example, the guide slit may have any shape other than a straight line, such as an arc, curve, or sawtooth, as long as it allows the screw Sc to slide. A sawtooth shape allows for multi-stage angle adjustment rather than continuous adjustment, which is advantageous in terms of increasing holding power. Furthermore, while each embodiment employs an efficient LED light source as the light source, the present invention can also be applied when using an older incandescent bulb. In fact, the effects of the present invention are even greater when a heavier incandescent bulb is used as the light source.

[0040] Furthermore, the above-described embodiments can be combined by utilizing each other's technologies, as long as there are no particular contradictions or problems in their purposes, configurations, etc. Most downlights for home use are lightweight, and among them, universal downlights with freely adjustable angles are also common. Because they are lightweight, they can be held in place by friction at the center of the axis with a single-point fastening, and even if the angle shifts, it does not pose a significant problem, making them universal. The present invention is not such a lightweight downlight for home use, but a heavy-duty downlight equipped with a heat sink. It is a decorative light that, although its angle is adjustable, is used in a way that the angle is not easily changed once installed, and the angle is maintained by a two-point fastening. It should be properly understood that the great technical significance of the present invention lies in the idea or technical concept of a heavy-duty, semi-fixed lighting device that, by providing a distinctive rotation center axis, can set a large tilt angle while stably maintaining the fixed tilt angle once it has been set. [Explanation of symbols]

[0041] 1. Lighting device (downlight) 2....Lighting device body 21...Lower housing 22……Heat radiation part 3…………Fixing bracket 31...Long side 32...Bottom 4…………Fixing bracket slit 5....Tilt bracket 6....Rotational center shaft hole 61...First rotation center shaft hole 62...Second rotation center shaft hole 63...Third rotation center shaft hole 7…………Guide slit 8... Fall prevention wire mounting bracket

Claims

1. A lighting device that can be attached to a ceiling or sloped ceiling, two fixing brackets that are immovably attached to a ceiling or a sloped ceiling, and two tilting brackets for tiltably attaching the lighting device body to the fixing brackets, The fastener has a fastener slit extending in the longitudinal direction, The tilting bracket is attached to the lighting device body so as not to move, and has a rotation center shaft hole and a guide slit that limits the rotation angle, the rotation center shaft hole includes a first rotation center shaft hole provided at a position offset from a virtual plane that is perpendicular to the tilting bracket and passes through a central axis of the lighting device body, The fixture slit is screwed to the rotation center shaft hole, and the fixture slit is screwed to any position of the guide slit, so that the lighting device body can be mounted at an angle relative to the vertical direction. A lighting device characterized by:

2. The rotation center shaft hole further includes a second rotation center shaft hole provided at an offset position on the opposite side of the virtual plane from the first rotation center shaft hole.

2. The lighting device according to claim 1.

3. The rotation center shaft hole further includes a third rotation center shaft hole provided on the virtual plane.

2. The lighting device according to claim 1.

4. The rotation center shaft hole further includes a second rotation center shaft hole provided at an offset position on the opposite side of the virtual plane from the first rotation center shaft hole, and a third rotation center shaft hole provided on the virtual plane.

2. The lighting device according to claim 1.

5. The lighting device has a fall prevention wire mounting bracket between the two tilting brackets, The first rotation center shaft hole is provided on the side opposite to the side where the fall prevention wire mounting bracket is disposed.

2. The lighting device according to claim 1.

6. The lighting device has a fall prevention wire mounting bracket between the two tilting brackets, The first rotation center shaft hole is provided on the side opposite to the side where the fall prevention wire mounting bracket is disposed.

2. The lighting device according to claim 1.

7. The lighting device is a downlight.

7. The lighting device according to claim 1, wherein the light source is a light source.

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