Lighting tool

Abstract

To provide a lighting tool which can suppress a light intensity value above a first direction in which the light intensity value becomes maximum.SOLUTION: A lighting tool 1 according to one aspect of the present disclosure, has a tool body 2 for storing a light emitting element and a reflective mirror unit 252 for controlling distribution of light emitted by the light emitting element, and emits light on a stadium. The lighting tool 1 includes: a rear reflective mirror 252R positioned on a rear side Dr from the light emitting element and having a parabolic reflective surface MA on which a focal point is set at a light emitting center O of the light emitting element; and a front reflective mirror 252F positioned on a front side Df of the light emitting element and having a planar reflective surface N. The rear reflective mirror 252R is stored in the tool body 2 in a posture in which a center axis MAA of the parabolic reflective surface MA is inclined at a first predefined angle toward the front side Df with an optical axis F of the light emitting element as a reference. The front reflective mirror 252F is stored in the tool body in a posture in which the planar reflective surface N is positioned above Du a first direction Ds1 which is inclined at the first predefined angle from the light emitting center.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present disclosure relates to a lighting fixture. [Background technology]

[0002] Floodlights are known as one type of lighting equipment (see, for example, Patent Documents 1 and 2). Floodlights are equipment that include a light source and an optical system that controls light distribution, and that illuminate a specific direction with light with controlled light distribution, and are used for various purposes such as sports lighting for illuminating stadiums. Floodlights that use light-emitting elements such as LEDs as light sources and achieve high output are also known.

[0003] On the other hand, measures against light pollution are required for outdoor lighting. For example, leakage of light can be suppressed by limiting the luminous intensity value above the first direction where the luminous intensity value is maximum. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-005535 A [Patent Document 2] Patent Publication No. 2021-082564 Summary of the Invention [Problem to be solved by the invention]

[0005] Generally, as the maximum luminous intensity value in a first direction increases with increasing output of the floodlight, the luminous intensity value above in the first direction also increases, making it difficult to keep the luminous intensity value above in the first direction low.

[0006] An object of the present disclosure is to provide a lighting device that can suppress the luminous intensity value above a first direction in which the luminous intensity value is maximum. [Means for solving the problem]

[0007] A lighting fixture according to one aspect of the present disclosure has a fixture body that houses a light-emitting element and a reflector unit that controls the distribution of light emitted by the light-emitting element, and is used to illuminate a stadium, and includes a rear reflector located behind the light-emitting element and having a parabolic reflective surface focused on the light-emitting center of the light-emitting element, and a front reflector located forward of the light-emitting element and having a planar reflective surface, wherein the rear reflector is housed in the fixture body in an orientation in which the central axis of the parabolic reflective surface is tilted forward at a first predetermined angle with respect to the optical axis of the light-emitting element, and the front reflector is housed in the fixture body in an orientation in which the planar reflective surface is located above a first direction inclined at the first predetermined angle from the light-emitting center. Effect of the Invention

[0008] According to one aspect of the present disclosure, the luminous intensity value above a first direction in which the luminous intensity value is greatest can be suppressed. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a side view of a lighting fixture according to the present disclosure. [Diagram 2] FIG. 2 is a perspective view of the lighting fixture as viewed from the front side. [Diagram 3] FIG. [Figure 4] FIG. 2 is a plan view of the lighting fixture as seen from the rear side. [Diagram 5] FIG. 2 is a perspective view of the lighting fixture as viewed from the rear side. [Figure 6] 6 is an enlarged view showing the rear side surface and its vicinity in FIG. 5. FIG. [Figure 7] 5 is a cross-sectional view taken along the line AA in FIG. 4. [Figure 8] 5 is a cross-sectional view taken along line BB in FIG. 4. [Figure 9] FIG. 2 is a cross-sectional view showing the internal configuration of the device body. [Figure 10] FIG. 10 is an enlarged view of a portion X in FIG. [Figure 11] FIG. [Figure 12] It is an exploded perspective view of a mirror unit. [Figure 13] It is a perspective view of the mirror unit viewed from the side of the light exit port. [Figure 14] It is a diagram showing the cross-sectional configurations of the respective mirror units for wide angle, medium angle, and narrow angle. [Figure 15] It is a plan view of the mirror unit for wide angle.

Mode for Carrying Out the Invention

[0010] Hereinafter, preferred embodiments according to the present disclosure will be described with reference to the drawings. In the drawings, the dimensions and scales of each part may be appropriately different from the actual ones, and there may be parts that are schematically shown for easy understanding. Further, in the following description, unless there is a specific description to limit the present disclosure, the scope of the present disclosure is not limited to the forms described in the following description. The scope of the present disclosure includes the equivalent scope of the forms.

[0011] 1. Embodiment FIG. 1 is a side view of a lighting fixture 1 according to the present embodiment. The lighting fixture 1 of the present embodiment is a projector used for floodlighting in sports lighting for illuminating an arena, and is a fixture suitable for use in an outdoor environment by taking measures against light pollution. In the following description, the vertically upward direction is defined as the upper direction Du, and the vertically downward direction Dvd is defined as the lower direction Dd. Also, in the horizontal direction, the side where the irradiation target is located as viewed from the lighting fixture 1 is defined as the front direction Df, and the direction opposite to the front direction Df is defined as the rear direction Dr. Further, in the lighting fixture 1, the surface including the light exit surface 1A that emits light is defined as the front surface, and the surface on the side opposite to the light exit surface 1A is defined as the rear surface. Also, in the light distribution of the lighting fixture 1, the direction in which the maximum luminous intensity value Amax is located is defined as the first direction Ds1. This first direction Ds1 corresponds to the direction of the first predetermined angle α1 forward with respect to the optical axis F (FIG. 9) of the light source described later. Further, the direction of the second predetermined angle α2 upward from the first direction Ds1 is defined as the second direction Ds2, and the luminous intensity value in the second direction Ds2 is referred to as the second direction luminous intensity value As2.

[0012] The lighting fixture 1 of this embodiment is a high-output fixture with a second predetermined angle α2 of 15 degrees, a second-direction luminous intensity value As2 of 2500 cd or less, and a maximum luminous intensity value Amax of 400 to 800 times the second-direction luminous intensity value As2. That is, despite the high output of the lighting fixture 1, the second-direction luminous intensity value As2 is limited to 2500 cd or less, so that leakage of light in the installation environment of the lighting fixture 1 is sufficiently suppressed. Furthermore, the lighting device 1 of the present embodiment has a configuration for suppressing leak light, as well as a configuration for enabling weight reduction and compactness.

[0013] The configuration of the lighting fixture 1 will now be described in detail.

[0014] As shown in FIG. 1, the lighting fixture 1 of this embodiment comprises a fixture body 2, a heat dissipation mechanism 3 that dissipates heat inside the fixture body 2 to the outside, a wiring box 4 that supplies power to the fixture body 2, a pair of plate-shaped guard members 6 provided on the left and right sides of the back side of the fixture body 2, and an arm mechanism 8 that is fixed to an installation surface B of a structure such as a stand and supports the fixture body 2 so that it can be rotated freely in front Df and diagonally upward Du of the installation surface B.

[0015] Fig. 2 is a perspective view of the lighting fixture 1 as viewed from the front side, and Fig. 3 is an exploded perspective view of the lighting fixture 1. Fig. 4 is a plan view of the lighting fixture 1 as viewed from the rear side, and Fig. 5 is a perspective view of the lighting fixture 1 as viewed from the rear side.

[0016] As shown in FIG. 2, the fixture body 2 is a box-shaped case body with a bottom and a substantially rectangular shape in front view, which houses a light source and a light control member. The fixture body 2 of this embodiment is made of an aluminum die-casting product, and its surface is appropriately painted. As shown in FIG. 3, an emission port 20 that forms an emission surface 1A that emits light is opened at the front of the fixture body 2. The fixture body 2 has a cover section 21 that is fixed to the front side of the fixture body 2 with a resin packing 22 between them and an appropriate fastener such as a screw, thereby sealing the emission port 20. The cover section 21 is a member that includes a transparent flat-plate-shaped cover material 21A made of resin or glass, and a rectangular frame body 21B into which the cover material 21A is fitted.

[0017] The heat dissipation mechanism 3 is provided on the rear surface 2C (FIG. 6) of the appliance body 2, and includes a plurality of heat dissipation units 24 arranged on the rear surface of the appliance body 2 as shown in FIG. 4. Each heat dissipation unit 24 includes a plurality of heat dissipation fins 240 and a plurality of heat pipes 241 that collect heat from inside the appliance body 2 and transmit it to each heat dissipation fin 240. These heat dissipation units 24 are disposed between a pair of guard members 6, and as shown in FIG. 1, the height of each heat dissipation unit 24 from the rear surface of the appliance body 2 is kept lower than the height of the guard members 6, so that the heat dissipation units 24 are protected by the guard members 6. The pair of guard members 6 are connected by a plurality of metal rods 26 that cross the width direction of the appliance body 2 above the heat dissipation units 24 Du as shown in FIG. 5. Since the heat dissipation mechanism 3 is provided on the outside of the fixture body 2, it is possible to reduce the depth of the fixture body 2. In this embodiment, the depth of the fixture body 2 is smaller than the width W, and by reducing the depth, the fixture body 2 is made thinner and lighter. In addition, since the heat dissipation mechanism 3 is provided on the back surface 2C of the fixture body 2, the overall width W of the lighting fixture 1 is not increased by the heat dissipation mechanism 3.

[0018] The wiring box 4 is a substantially box-shaped case body made of aluminum die-casting, and its surface is appropriately painted. In this embodiment, the wiring box 4 is fixed to the rear side surface 2SR of the fixture body 2 on the outside (more specifically, between a pair of arm connection parts 28 described later) as shown in Fig. 5. The rear side surface 2SR is the rear end portion that is located furthest to the rear Dr when the lighting fixture 1 is installed on the installation surface B, in other words, the portion that is closest to the installation surface B, among the side surfaces around the fixture body 2.

[0019] FIG. 6 is an enlarged view showing the vicinity of the rear side surface 2SR in FIG. The arm mechanism 8 is connected to the rear side surface 2SR of the instrument body 2. More specifically, as shown in Figs. 4 and 6, the rear side surface 2SR is provided with a pair of plate-shaped arm connection parts 28 protruding rearward Dr, and the arm mechanism 8 is connected to the pair of arm connection parts 28. The arm mechanism 8 of the present embodiment includes an arm member 80, a pair of left and right rotation range defining plates 81, a pair of left and right handles 82, and a pair of left and right clamping mechanisms 83.

[0020] 6, the arm member 80 is a generally U-shaped member including a pair of thick plate-like extending portions 800 extending linearly on the left and right sides, and a thick plate-like connecting portion 801 connecting end portions 800A1 of the pair of extending portions 800, and a steel material such as SS400 is used for the arm member 80 in this embodiment. Note that the material of the arm member 80 is arbitrary as long as it can obtain a predetermined strength and rigidity.

[0021] The pair of extensions 800 are each provided with a bolt hole 800K at a tip end 800A2, and are rotatably attached to the arm connection portion 28 of the rear side surface 2SR by a bolt 802 passed through each bolt hole 800K. Connecting part 801 is a part that is fixed to installation surface B, and is provided with fixing holes 803 through which fixing bolts pass. Connecting part 801 of this embodiment also includes horizontal angle scale portion 805 on which angle scale 804 is marked in an arc shape centered on fixing hole 803, and the horizontal angle scale portion 805 makes it possible to check the horizontal installation angle. This horizontal angle scale portion 805 is formed to bulge in an arc shape in the width direction of connecting part 801, so that the installation area between connecting part 801 and installation surface B is increased by the amount of horizontal angle scale portion 805.

[0022] 1, in the arm member 80, a pair of extension parts 800 extend linearly so as to rise from a connecting part 801 fixed to the installation surface B toward a forward Df and diagonally upward Du, thereby rotatably supporting the instrument body 2 at a position Df forward and diagonally upward Du from the installation surface B. This makes it possible to prevent the instrument body 2 from coming into contact with a stand or structure to which the connecting part 801 is fixed, even when the instrument body 2 rotates downward as indicated by the arrow E in the figure with the bolt 802 as the rotation axis.

[0023] 6, the pair of left and right rotation range defining plates 81 are plates made of steel such as SUS304 that define the rotation range of the instrument body 2 relative to the arm member 80, and are fixed together with the arm member 80 to each of the pair of arm connection parts 28 on the rear side surface 2SR by the above-mentioned bolts 802. In this case, each of the pair of rotation range defining plates 81 is fixed to the arm connection part 28 by a fastener 812 (FIGS. 7 and 8) such as a screw different from the bolt 802, and is thereby fixed so as not to rotate relative to the arm connection part 28. In other words, the rotation range defining plates 81 rotate integrally with the instrument body 2 relative to the arm member 80. Furthermore, each of the pair of left and right rotation range determining plates 81 is provided with an arc-shaped long hole 810 centered on the insertion point of the bolt 802 (i.e., the rotation axis of the instrument body 2), and this long hole 810 determines the rotation range of the instrument body 2, i.e., the top dead center and bottom dead center during rotation.

[0024] In this embodiment, at least one of the pair of left and right rotation range defining plates 81 also functions as a depression plate by having an angle scale 809 on its surface for enabling confirmation of the mounting angle in the depression angle direction.

[0025] Each of the pair of left and right handles 82 is a member that is gripped by an operator when adjusting the depression angle of the instrument body 2, that is, when the operator rotates the instrument body 2. Each of the pair of handles 82 is a member made of steel such as SUS304, and is a rod-shaped member extending in the direction of the width W of the instrument body 2. One end 820A1 of each of the pair of handles 82 penetrates the extension portion 800 of the arm member 80, and is inserted into the long hole 810 of each rotation range defining plate 81.

[0026] The pair of left and right clamping mechanisms 83 are mechanisms for fixing the arm member 80 to be non-rotatable. The clamping mechanism 83 of this embodiment includes a pair of nuts 830A, 830B screwed into one end 820A1 of each handle 82. These nuts 830A, 830B are members for fixing the arm member 80 to the rotation range defining plate 81 to be non-rotatable by fastening, and are attached to the handle 82 in a state in which the extension part 800 of the arm member 80 and the rotation range defining plate 81 are sandwiched between the nuts. Then, the pair of nuts 830A, 830B are fastened to firmly sandwich the extension part 800 of the arm member 80 and the rotation range defining plate 81, whereby the arm member 80 is fixed to the rotation range defining plate 81 and the instrument main body 2 to be non-rotatable.

[0027] When adjusting the depression angle of the tool body 2, the operator loosens the nuts 830A and 830B of the pair of left and right clamping mechanisms 83, so that the tool body 2 can rotate around the bolt 802 as a rotation axis. In this case, the rotation range of the tool body 2 is restricted by the long hole 810 of the rotation range regulating plate 81, so that the tool body 2 does not rotate to an angle smaller than the bottom dead center. Then, the operator holds at least one of the pair of left and right handles 82 (for example, the one that is easier for the operator to work with) to rotate the tool body 2 to a desired angle, and in that state, tightens the nuts 830A and 830B of the pair of left and right clamping mechanisms 83 to fix the tool body 2. Since the clamping mechanisms 83 are provided on the left and right, the tool body 2 can be fixed more firmly than in a configuration in which the clamping mechanisms 83 are provided on only one side, and the reliability of the fixation is improved.

[0028] According to the lighting fixture 1 having such a configuration, as described above, the arm member 80 of the arm mechanism 8 is connected by the bolt 802 to the rear side surface 2SR, which is the portion of the side surface of the fixture body 2 that is located furthest to the rear Dr when the lighting fixture 1 is installed on the installation surface B, in other words, the portion that is closest to the installation surface B. Therefore, in the arm member 80, the length of the extension portion 800 extending from the installation surface B to the fixture body 2 is shortened compared to, for example, a configuration in which the arm member 80 is connected to the side surfaces on both the left and right sides of the fixture body 2, and the weight of the arm member 80 is reduced by the shortened amount. This realizes a reduction in the weight of the lighting fixture 1.

[0029] 4, the distance between the pair of arm connection parts 28, the length of the handles 82, the shape of the handles 82, and the like are set so that the pair of handles 82 falls within the range of the width W of the fixture body 2. The width W is the width in the direction perpendicular to the forward direction Df and the rearward direction Dr. Therefore, in the lighting fixture 1, parts such as handle 82 of arm mechanism 8 do not protrude from fixture body 2 in the direction of width W, realizing a fixture with a compact width W. Furthermore, when multiple lighting fixtures 1 are arranged side by side in the direction of width W of fixture body 2, parts of arm mechanism 8 do not interfere with each other, and the lighting fixtures 1 can be installed closely together.

[0030] Here, in the configuration in which the rotation shaft (bolt 802) of the arm mechanism 8 is provided on the rear side surface 2SR, the distance between the rotation shaft and the center position of the instrument body 2 is greater than in a general configuration in which the arm rotation shaft is provided on the left or right side surface of the instrument body 2. Therefore, the load applied to the arm connection part 28 and the arm mechanism 8 is greater than in the general configuration. In contrast, in this embodiment, the rotation of the instrument body 2 is fixed not by the rotation axis (bolt 802) of the arm mechanism 8, but by a pair of rotation range determining plates 81 and a pair of clamping mechanisms 83, so that the instrument body 2 can be fixed more stably.

[0031] Furthermore, since the lighting fixture 1 has a large distance between the rotation axis and the center position of the fixture body 2, the fixture body 2 becomes easy to rotate when the pair of clamping mechanisms 83 is loosened and the fixture body 2 becomes free to rotate. Therefore, the arm mechanism 8 of this embodiment has a configuration that slows down the rotation even when the fixture body 2 is free to rotate. This configuration will be described with reference to Figs. 7 and 8.

[0032] 7 is a cross-sectional view taken along line AA in FIG. 4, and FIG. 8 is a cross-sectional view taken along line BB in FIG. In the arm mechanism 8 of this embodiment, at least one of a pair of left and right axis mechanisms 80P constructed using the above-mentioned bolts 802 has a structure that generates a frictional force that acts as resistance to rotation due to the weight of the instrument main body 2, so that even when the instrument main body 2 is free to rotate, the rotation becomes slow due to friction.

[0033] In detail, as shown in Figures 7 and 8, each of the pair of left and right shaft mechanisms 80P comprises a hollow pipe 850 inserted into a bolt hole 800K of the arm member 80 (more precisely, the extension portion 800), the above-mentioned bolt 802 having a head portion 802A having a width larger than the diameter of the hollow pipe 850, and a washer 852 inserted into the bolt 802 and disposed between the head portion 802A of the bolt 802 and the arm member 80. On the other hand, the pair of left and right shaft mechanisms 80P differ in the length of the hollow pipes 850. Specifically, as shown in Fig. 8, the length of the hollow pipe 850 provided in the right shaft mechanism 80P is a length that protrudes outward from the arm member 80 (extension portion 800) by ΔF, whereas, as shown in Fig. 7, the length of the hollow pipe 850 provided in the left shaft mechanism 80P is a length that does not protrude from the arm member 80 (extension portion 800).

[0034] Therefore, in the right-side shaft mechanism 80P, as shown in FIG. 8, the hollow pipe 850 protrudes, causing the washer 852 to be separated from the arm member 80 (extension portion 800). Even when the bolt 802 is tightened, almost no frictional force is generated between the arm member 80 and the washer 852, and the arm member 80 (extension portion 800) is generally free to rotate relative to the bolt 802. 7, in the left-side shaft mechanism 80P, the hollow pipe 850 does not protrude from the arm member 80 (extension portion 800), and therefore the washer 852 comes into contact with the arm member 80 (extension portion 800) with a pressing force corresponding to the tightening of the bolt 802. Therefore, when the instrument body 2 is not fixed by the clamping mechanism 83 and is free to rotate, a frictional force of a magnitude that slows down the rotation of the instrument body 2 is generated between the arm member 80 and the washer 852 when the instrument body 2 rotates under its own weight.

[0035] Note that both of the pair of left and right shaft mechanisms 80P may be structured to generate frictional force that acts as resistance to the rotation of the tool body 2. In this case, it is desirable to adjust the frictional force to a level that does not make it difficult for the operator to rotate the tool body 2.

[0036] Next, the internal structure of the device main body 2 will be described in detail.

[0037] FIG. 9 is a cross-sectional view showing the internal configuration of the instrument body 2, and FIG. 10 is an enlarged view of a portion X in FIG. As described with reference to FIG. 3, the fixture body 2 of this embodiment is a bottomed box-shaped case body with an outlet 20 opening on the front side, and the outlet 20 is covered by a cover portion 21. As shown in FIG. 9 and FIG. 10, the fixture body 2 has a plurality of light source units 25 installed on the bottom surface 2B. As shown in FIG. 10, each of the plurality of light source units 25 is a unit including an LED 250, which is an example of a light source, and a reflector unit 252, which is an example of a light distribution control member, and all of them have the same configuration and the same light distribution characteristics. The plurality of light source units 25 are arranged side by side from the front direction Df to the rear direction Dr of the fixture body 2, and are also arranged side by side in the direction of the width W of the fixture body 2, as shown in FIG. 3. In other words, the plurality of light source units 25 are arranged in a lattice pattern inside the fixture body 2.

[0038] The LED 250 is an example of a light-emitting element. A COB (Chip On Board) type element having a higher output than an SMD (Surface Mount Device) type element is used for the LED 250 in this embodiment, and the output of the lighting device 1 is increased. As shown in FIG. 10, a heat pipe 241 provided in the heat dissipation unit 24 described above is disposed near the rear side of each LED 250 in a state of being fitted into a groove on the rear surface 2C of the device body 2, and the heat generated by the LED 250 is efficiently collected by the heat pipe 241 and released to the outside from the heat dissipation fin 240.

[0039] The reflecting mirror unit 252 forms a so-called forward light distribution having a beam angle corresponding to a narrow angle, a medium angle, or a wide angle (narrow angle in this embodiment) and a maximum luminous intensity value Amax in a first direction Ds1 that is a first predetermined angle α1 away forward Df from the optical axis F of the LED 250 as shown in Fig. 10. The optical axis F is defined by a straight line extending from the light-emitting center O of the light-emitting surface of the LED 250 in the normal direction of the light-emitting surface. In this embodiment, the first predetermined angle α1 is 30 degrees. However, the first predetermined angle α1 may be an angle in the range of 20 degrees to 40 degrees.

[0040] Because the light distribution of the light source unit 25 is forward light distribution, the device body 2 can illuminate the forward Df when the device body 2 is installed with the emission surface 1A parallel to the horizontal direction as shown in Fig. 1. Even when illuminating a farther area in the forward direction Df from the device body 2, the depression angle of the device body 2 can be smaller than in a device with a non-forward light distribution, so the area subjected to wind pressure (pressure-receiving area) is smaller.

[0041] Furthermore, the reflector unit 252 of this embodiment forms a light distribution in which the second direction luminous intensity value As2 in the second direction Ds2, which is away from the first direction Ds1 in the upward direction Du by the second predetermined angle α2, is equal to or less than a predetermined limited luminous intensity value, thereby suppressing light leakage in the upward Du. In this embodiment, the second predetermined angle α2 is 15 degrees, and the predetermined limited luminous intensity value is 2500 cd. However, the second predetermined angle α2 may be an angle in the range of 15 degrees to 25 degrees.

[0042] FIG. 11 is an exploded perspective view of the light source unit 25. As shown in FIG. The light source unit 25 includes an LED mounting board 253, a ceramic board 254, an LED protective packing 255, and a plurality of (two in the illustrated example) reflecting mirror units 252 described above. The LED mounting board 253 is a board having a generally rectangular shape in plan view on which a plurality of LEDs 250 (four in the illustrated example) are mounted, and is an aluminum board in this embodiment.

[0043] The ceramic substrate 254 is a substrate made of ceramics having high electrical insulation and thermal conductivity, and alumina or the like is used as the material thereof. The ceramic substrate 254 is fixed to the back side (the surface opposite to the mounting surface on which the LEDs 250 are mounted) of the LED mounting substrate 253 in order to insulate the bottom surface 2B of the device main body 2 from the LED mounting substrate 253. In addition, a thermosetting inter-ceramic heat dissipation grease is applied to the surface of the ceramic substrate 254 that comes into close contact with the LED mounting substrate 253 in order to increase the efficiency of heat conduction from the LED mounting substrate 253 to the ceramic substrate 254.

[0044] LED protective packing 255 is a sheet-like member made of silicone resin that protects the mounting surface of LED mounting board 253, and is provided so as to cover the mounting surface of LED mounting board 253. LED protective packing 255 is provided with a plurality of openings 255A, and each LED 250 of LED mounting board 253 is exposed from each opening 255A.

[0045] The multiple reflecting mirror units 252 are fixed by electrically insulating fastening means to the mounting surface of the LED mounting board 253 protected by the LED protective packing 255. In this embodiment, one reflecting mirror unit 252 controls the distribution of light emitted by multiple (two in the illustrated example) LEDs 250 arranged in a row.

[0046] FIG. 12 is an exploded perspective view of reflecting mirror unit 252, and FIG. 13 is a perspective view of reflecting mirror unit 252 viewed from the light exit port 252A side. The reflector unit 252 of this embodiment comprises a rear reflector 252R having a compound parabolic reflecting surface M, and a front reflector 252F having a planar reflecting surface N, and the rear reflector 252R and the front reflector 252F are connected by a spiral 256, which is an example of a connecting means, in a position in which the compound parabolic reflecting surface M and the planar reflecting surface N face each other.

[0047] Both the composite parabolic reflecting surface M and the planar reflecting surface N are reflecting surfaces that reflect light emitted by multiple (two in the illustrated example) LEDs 250, and each surface is subjected to a surface treatment such as aluminum deposition to increase reflectivity.

[0048] The composite parabolic reflecting surface M includes parabolic reflecting surfaces MA in the same number (two in the illustrated example) as the number of LEDs 250 for which light distribution control is performed by the reflector unit 252. Each parabolic reflecting surface MA includes a part of a paraboloid (paraboloid of revolution) having the light emitting center O of one of the LEDs 250 for which light distribution control is performed as a focus, and the central axes MAA (FIG. 10) are connected to each other in a parallel state. More specifically, each parabolic reflecting surface MA is a surface of a paraboloid having a focus at the light emitting center O, which is approximately equivalent to a predetermined angle range centered on the central axis MAA, in other words, approximately equivalent to a surface obtained by cutting a paraboloid of revolution parallel to the central axis MAA. Such a parabolic reflecting surface MA forms a light distribution having a maximum luminous intensity on the central axis MAA and a predetermined beam angle.

[0049] The planar reflecting surface N is a planar reflecting surface that abuts against the edges M1 on both sides of the composite parabolic reflecting surface M, thereby closing the opening on the central axis MAA side of the composite parabolic reflecting surface M. The planar reflecting surface N may be a parabolic surface having a curvature that is sufficiently larger than that of the parabolic reflecting surface MA and that can be regarded as a substantially flat surface. By the planar reflecting surface N blocking the composite parabolic reflecting surface M, as shown in Figure 13, a reflecting mirror unit 252 is formed in which a light inlet 252B opens on the focal side of the parabolic reflecting surface MA and a light outlet 252A opens at a position opposite the light inlet 252B.

[0050] The number of LEDs 250 for which the reflecting mirror unit 252 controls the light distribution may be one. In this case, the compound parabolic reflecting surface M becomes one parabolic reflecting surface MA.

[0051] In the fixture body 2 of this embodiment, as shown in Figure 10 above, each reflector unit 252 (each light source unit 25) has its respective rear reflector 252R (composite parabolic reflecting surface M, parabolic reflecting surface MA) located behind the LED 250 Dr, and its respective front reflector 252F (planar reflecting surface N) located in front of the LED 250 Df.

[0052] Furthermore, each rear reflector 252R is attached to the instrument body 2 in a posture that the central axis MAA of each parabolic reflecting surface MA points in the first direction Ds1 which is inclined forward Df by a first predetermined angle α1 with respect to the optical axis F of the LED 250. Thereby, a forward light distribution having a maximum luminous intensity value Amax in the first direction Ds1 in front Df of the optical axis F is formed. Also, since the height of each parabolic reflecting surface MA in the direction of the optical axis F (the direction of the vertically downward direction Dvd) becomes lower as each parabolic reflecting surface MA is inclined forward Df, the depth of the instrument body 2 can be made shallower, and the instrument body 2 can be made thinner and lighter.

[0053] On the other hand, each front reflector 252F is attached to the instrument body 2 in a posture that the planar reflecting surface N is positioned above Du in a second direction Ds2 which is inclined upward Du by a second predetermined angle α2 with respect to the first direction Ds1. In the present embodiment, the end N1 on the light exit port 252A side of the planar reflecting surface N is generally positioned in the second direction Ds2. Thereby, as shown in FIG. 10, among the direct light emitted from the LED 250, the light L1 traveling upward Du from the second direction Ds2 enters the planar reflecting surface N and is reflected, so that the leakage light leaking upward Du in the first direction Ds1 is suppressed and the light pollution is countered. Also, since the light L1 reflected by the planar reflecting surface N is irradiated from the light exit port 252A toward the irradiation target, a decrease in light efficiency is also suppressed.

[0054] Here, when a part of the direct light L2 emitted from the LED 250 enters and is reflected near the end N2 on the light incident port 252B side (the side close to the LED 250) of the planar reflecting surface N, as shown by the broken line in FIG. 10, the light L2 is reflected by the planar reflecting surface N at the reflection angle at which the light L2 enters the parabolic reflecting surface MA. For this reason, the light L2 is secondarily reflected by the parabolic reflecting surface MA and is emitted from the light exit port 252A upward Du from the second direction Ds2, thereby becoming a leakage light component. Therefore, in this embodiment, in the front reflecting mirror 252F, the planar reflecting surface N is provided with a notch NA, which is an example of a non-reflecting means that makes the light L2 non-reflecting, by passing the light L2, at a portion where the light L2 is reflected by the planar reflecting surface N at a reflection angle incident on the parabolic reflecting surface MA. This prevents the light L2 from becoming a leak light component due to secondary reflection by the parabolic reflecting surface MA. In addition, instead of providing a reflecting surface at the portion of the cutout portion NA, a means for transmitting the light L2 or absorbing the light L2 may be provided instead of the cutout portion NA.

[0055] In the reflector unit 252 of this embodiment, as shown in Fig. 10, each parabolic reflecting surface MA of each rear reflector 252R extends until its tip MA1 intersects with the optical axis F, and light L3 near the optical axis F, which has the highest luminous intensity value among the direct light emitted from the LED 250, is incident on the parabolic reflecting surface MA and light distribution is controlled. This prevents the range from the fixture body 2 in the direction of the optical axis F from being directly illuminated by light L3 with a relatively high luminous intensity value, and prevents a decrease in uniformity.

[0056] However, as described above, the reflector unit 252 forms a forward light distribution, so that the light flux directed from the optical axis F toward the rear Dr is not obtained, and the brightness of the rear Df is insufficient compared to the device body 2. Therefore, the reflector unit 252 of this embodiment makes a part of the light L4 emitted from the light exit 252A incident on the outer surface 252RA of the rear reflector 252R of the other reflector unit 252 located in the front Df of the reflector unit 252. Specifically, the reflector unit 252 located in the rear Df of the two reflector units 252 arranged in front and rear has an end N1 of its front reflector 252F arranged in the vicinity of the outer surface 252RA of the rear reflector 252R of the other reflector unit 252 located in the front Df, and the light L4 emitted from the vicinity of the end N1 is incident on the outer surface 252RA of the rear reflector 252R of the other reflector unit 252. As a result, the light L4 is reflected toward the rear Dr by the outer surface 252RA of the rear reflecting mirror 252R, and the brightness of the rear Df of the device main body 2 is compensated for by the light L4.

[0057] According to the present embodiment described above, the following effects are achieved.

[0058] The lighting fixture 1 of the present embodiment includes a fixture body 2 that houses an LED 250 and a reflector unit 252 that controls the light distribution of the light emitted by the LED 250, and is a fixture for illuminating an arena. This lighting fixture 1 includes a rear reflector 252R having a parabolic reflecting surface MA that is located behind Dr with respect to the LED 250 and has a focus set at the light emission center O of the LED 250, and a front reflector 252F that is located in front Df with respect to the LED 250 and has a planar reflecting surface N. Further, the rear reflector 252R is housed in the fixture body 2 in a posture in which the central axis MAA of the parabolic reflecting surface MA faces in a first direction Ds1 that is a direction of a first predetermined angle α1 toward the front Df with respect to the optical axis F of the LED 250, and the front reflector 252F is housed in the fixture body 2 in a posture in which the planar reflecting surface N is located above Du with respect to the first direction Ds1.

[0059] According to this configuration, the forward light distribution in which the maximum luminous intensity value Amax is arranged in front Df with respect to the optical axis F while having a predetermined beam angle is obtained by the parabolic reflecting surface MA of the rear reflector 252R. Thereby, the range in front Df of the fixture body 2 in the arena can be efficiently illuminated with sufficient brightness. In addition to this, since the planar reflecting surface N is arranged above Du with respect to the first direction Ds1 of the maximum luminous intensity value Amax, even when the maximum luminous intensity value Amax increases, the luminous intensity value in the direction above Du with respect to the first direction Ds1 (for example, the second direction luminous intensity value As2 described above) can be surely suppressed, and the leakage light to the upper side Du is sufficiently suppressed.

[0060] In the lighting fixture 1 of the present embodiment, the first predetermined angle α1 is an angle in the range of 20 degrees to 40 degrees. According to this configuration, a light distribution suitable for sports lighting for illuminating an arena is obtained.

[0061] In the lighting fixture 1 of the present embodiment, the parabolic reflecting surface MA of the rear reflector 252R intersects the optical axis F of the LED 250. According to this configuration, the light L3 having a relatively high luminous intensity value among the direct light emitted by the LED 250 does not directly illuminate the range from the fixture body 2 in the direction of the optical axis F, thereby preventing a decrease in the uniformity.

[0062] In the lighting fixture 1 of this embodiment, the front reflector 252F is stored in the fixture body 2 in a position in which its planar reflecting surface is positioned above the second direction Ds2, which is a direction at a second specified angle α2 upwardly relative to the first direction Ds1. According to this configuration, it is possible to reliably suppress leakage of light in the upward direction Du beyond the second direction Ds2.

[0063] In the lighting device 1 of this embodiment, the second predetermined angle α2 is an angle in the range of 15 degrees to 25 degrees. This configuration reliably reduces light leakage, which is a problem when illuminating outdoor stadiums, and can combat light pollution.

[0064] In the lighting device 1 of this embodiment, the front reflecting mirror 252F has an end N1 of the planar reflecting surface N that is closer to the light exit port 252A of the parabolic reflecting surface MA and is located near the second direction Ds2. According to this configuration, the planar reflecting surface N can reliably cut off the light in the second direction Ds2.

[0065] In the lighting device 1 of this embodiment, the front reflecting mirror 252F includes a means for transmitting or absorbing a portion of light L2 of the direct light emitted by the LED 250 near the end N2 of the planar reflecting surface N closer to the LED 250. According to this configuration, it is possible to prevent the light L2 from becoming a leakage light component due to secondary reflection at the parabolic reflecting surface MA.

[0066] In the lighting fixture 1 of this embodiment, the number of reflector units 252 is two or more. The reflector units 252 are arranged in the front-rear direction, and a portion of the light L4 emitted from the reflector unit 252 located at the rear is incident on an outer surface 252RA of a rear reflector 252R of the other reflector unit 252 located at the front, and is reflected backward Dr by the outer surface 252RA. According to this configuration, even in the case of forward light distribution, the brightness of the rear Df of the device body 2 can be supplemented by the light L4 reflected rearward Dr.

[0067] The lighting fixture 1 of this embodiment includes a box-shaped fixture body 2 that houses an LED 250 as a light source, and an arm member 80 that is fixed to a structure and supports the fixture body 2 in the front Df and diagonally upward Du of the structure. The lighting fixture 1 also includes a pair of plate-shaped arm connection parts 28 that are provided on the rear side surface 2SR, which is the rear end of the fixture body 2, and are rotatably supported by the arm member 80, and a pair of rod-shaped handles 82 that are provided on each of the pair of arm connection parts 28 and are used to rotate the fixture body 2. In a plan view of the fixture body 2, both of the pair of handles 82 are within the range of the width W of the fixture body 2.

[0068] According to this configuration, the arm member 80 is connected to the rear side surface 2SR, which is the portion closest to the structure among the side surfaces around the fixture body 2. Therefore, the length of the extension portion 800 of the arm member 80 extending from the structure to the fixture body 2 is shortened compared to, for example, a configuration in which the arm member 80 is connected to both the left and right side surfaces of the fixture body 2, and the weight of the arm member 80 is reduced by the shortened amount. This realizes a reduction in the overall weight of the lighting fixture 1. In addition, because the pair of handles 82 are both within the range of the width W of the fixture body 2, the width W can be made compact. Also, when multiple lighting fixtures 1 are arranged side by side in the direction of the width W of the fixture body 2, the parts of the arm mechanism 8 do not interfere with each other, and the lighting fixtures 1 can be installed closely together.

[0069] The lighting fixture 1 of this embodiment is equipped with a pair of rotation range determining plates 81 provided on each of the pair of arm connection portions 28, each having an arc-shaped long hole 810 that determines the rotation range of the fixture body 2, and one end 820A1 of a handle 82 being inserted into the long hole 810, and a clamping mechanism 83 provided on each of the tip portions 820A of the pair of handles 82, which clamps the rotation range determining plate 81 and the arm member 80 to fix them so that they cannot rotate. According to this configuration, the instrument main body 2 can be fixed more stably than in a configuration in which the rotation is fixed at the rotation axis (bolt 802) of the arm member 80.

[0070] The lighting fixture 1 of this embodiment comprises a pair of bolts 802 that rotatably fix the arm member 80 to each of the pair of arm connection portions 28, and a pair of washers 852 inserted into each of the pair of bolts 802, and at least one of the pair of washers 852 comes into contact with the arm member 80, generating a frictional force of a magnitude that slows down the rotation of the fixture body 2 due to its own weight when the fixture body 2 is not fixed by the clamping mechanism 83. According to this configuration, even if the clamping mechanism 83 does not fix the rotation of the fixture body 2 and the fixture body 2 is free to rotate, the rotation can be slowed down, thereby preventing sudden movement of the lighting fixture 1 during installation work and increasing the safety of the work.

[0071] In the lighting fixture 1 of this embodiment, the fixture body 2 is a box-shaped body with a bottom and an opening at the front, an LED mounting board 253 on which LEDs 250 are mounted is provided on the bottom surface 2B of the fixture body 2, and a heat dissipation mechanism 3 for dissipating heat generated by the LEDs 250 is provided on the back surface 2C of the fixture body 2, and the depth of the fixture body 2 is smaller than the width W of the fixture body 2. According to this configuration, since the heat dissipation mechanism 3 is provided on the outside of the fixture body 2, the depth of the fixture body 2 can be made smaller than the width W of the fixture body 2, thereby achieving further weight reduction. In addition, since the heat dissipation mechanism 3 is provided on the back surface 2C of the fixture body 2, the overall width W of the lighting fixture 1 is not increased by the heat dissipation mechanism 3.

[0072] 2. Variations The modified forms added to the embodiments exemplified above are exemplified below. Two or more forms arbitrarily selected from the following examples may be appropriately combined within a range where they do not conflict with each other.

[0073] In the above-described embodiment, the mirror unit 252 that forms the light distribution of the beam angle corresponding to the narrow angle has been described. However, the mirror unit 252 may form the light distribution of the beam angle for the wide angle or the medium angle. FIG. 14 is a diagram showing a cross-sectional configuration of each of the mirror units 252 for the wide angle, the medium angle, and the narrow angle. As shown in the figure, the parabolic reflecting surface MA has a curvature of the parabolic reflecting surface MA that changes according to the beam angle, and the length in the direction of the central axis MAA becomes longer as the beam angle narrows. Also, the planar reflecting surface N becomes longer as the parabolic reflecting surface MA becomes longer according to the length.

[0074] FIG. 15 is a plan view of the mirror unit 252 for the wide angle. As described above, as the beam angle becomes wider, the lengths of the parabolic reflecting surface MA and the planar reflecting surface N become shorter, and the area available for light distribution control decreases. Therefore, it becomes difficult to distribute light to the rear Df from the optical axis F, and the light at the rear Df is likely to be insufficient. Therefore, as shown in FIG. 15, a parabolic surface side notch portion MA2 for supplementing the light amount at the rear Df may be provided at the tip MA1 of each parabolic reflecting surface MA of the compound parabolic reflecting surface M by allowing a part of the direct light L5 emitted by the LED 250 to pass through. Note that the parabolic surface side notch portion MA2 may also be provided in the mirror units 252 for the medium angle and the narrow angle.

[0075] The above-described lighting fixture 1 is not limited to sports lighting, and can be used for appropriate lighting applications such as lighting in a theater, for example.

Explanation of Reference Numerals

[0076] 1...Lighting fixture, 2...Fitment body, 2B...Bottom surface, 2C...Rear surface, 2SR...Rear side surface, 3...Heat dissipation mechanism, 4...Wiring box, 8...Arm mechanism, 20...Outlet, 21...Cover portion, 25...Light source unit, 28...Arm connection portion, 80...Arm member, 80P...Axis mechanism, 81...Rotation range determination plate, 82...Handle, 83...Clamping mechanism, 250...LED, 252...Reflector unit, 252A...Light outlet, 252B...Light inlet, 252F...Front reflector, 252R...Rear reflector, 252RA...Outer surface, 253...LED mounting board, 800... Extension portion, 801...connecting portion, 802...bolt, 809...angle scale, 810...long hole, 812...fastener, 830A, 830B...nut, 850...hollow pipe, 852...washer, A1...output surface, Amax...maximum luminous intensity value, As2...second direction luminous intensity value, B...installation surface, Df...forward direction, Dr...rearward direction, Ds1...first direction, Ds2...second direction, F...optical axis, M...composite parabolic reflecting surface, MA...parabolic reflecting surface, MAA...central axis, N...planar reflecting surface, NA...notch, O...light emitting center, W...width, α1...first specified angle, α2...second specified angle.

Claims

1. A lighting fixture for illuminating a stadium has a lighting device body that houses a light emitting element and a reflector unit that controls the distribution of light emitted by the light emitting element, a rear reflector located behind the light emitting element and having a parabolic reflecting surface with a focus set at the light emitting center of the light emitting element; a front reflecting mirror located forward of the light emitting element and having a flat reflecting surface; Equipped with The rear reflector is The light emitting element is housed in the fixture body in such a position that the central axis of the parabolic reflecting surface is inclined forward at a first predetermined angle based on the optical axis of the light emitting element, The front reflector is The light source is housed in the fixture body in such a position that the planar reflecting surface is located above a first direction inclined at a first predetermined angle from the light emission center. Lighting fixtures.

2. The first predetermined angle is an angle in the range of 20 degrees to 40 degrees.

2. A lighting fixture according to claim 1.

3. The rear reflector is The parabolic reflecting surface intersects with the optical axis of the light emitting element.

2. A lighting fixture according to claim 1.

4. The front reflector is The light source is housed in the fixture body in such a manner that the planar reflecting surface is located above a second direction inclined upward from the first direction by a second predetermined angle with respect to the light emission center.

2. A lighting fixture according to claim 1.

5. The second predetermined angle is an angle in the range of 15 degrees to 25 degrees.

5. A lighting device according to claim 4.

6. The front reflector is An end of the planar reflecting surface that is closer to the light exit port of the parabolic reflecting surface is located in the vicinity of the second direction.

5. A lighting device according to claim 4.

7. The front reflector is The flat reflecting surface is provided with a means for transmitting or absorbing light emitted by the light emitting element in the vicinity of the end portion closer to the light emitting element.

5. A lighting device according to claim 4.

8. The number of the reflecting mirror units is two or more, The reflecting mirror units are arranged in a front-rear direction, A part of the light emitted from the reflector unit located at the rear is incident on the outer surface of the rear reflector of the other reflector unit located at the front, and is reflected backward by the outer surface.

2. A lighting fixture according to claim 1.

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