JP7752336B2 - lighting fixtures - Google Patents

Description

This disclosure relates to lighting fixtures.

So-called high-ceiling lighting fixtures have been known for some time, installed in buildings with high ceilings such as gymnasiums and halls to illuminate the illuminated space from above (see, for example, Patent Document 1).

Patent No. 6840195

The lighting fixture in Patent Document 1 is provided with a heat sink for cooling the light source. This heat sink has multiple heat dissipation fins. Each heat dissipation fin is formed by bending a single metal sheet so that it has two heat dissipation plates. Furthermore, each heat dissipation plate is formed so that it is perpendicular to the mounting portion of the heat dissipation fin.

In order to improve the heat dissipation performance of a lighting fixture, it is necessary to increase the surface area of the heat sink. In a configuration in which the heat sink and mounting part intersect at right angles, as in Patent Document 1, the surface area of the heat sink can be increased by, for example, increasing the area of the plate material to which the heat dissipation fins are attached, thereby extending the width of each heat sink, or by extending the cover part, thereby extending the height of each heat sink. However, these methods result in an increase in the size of the lighting fixture.

The present disclosure therefore aims to provide a lighting fixture that is compact while improving heat dissipation performance.

To achieve the above object, a lighting fixture according to one embodiment of the present disclosure comprises a light source unit having a light source and attached to a base plate, and a plurality of heat dissipation fins attached to the base plate, the heat dissipation fins having a base portion fixed to the bottom plate and a heat dissipation plate formed at an angle relative to the bottom plate.

This disclosure makes it possible to improve the heat dissipation performance of lighting fixtures while reducing their size.

FIG. 1 is a perspective view of a lighting fixture according to an embodiment of the present invention, viewed from above. FIG. 2 is a perspective view of the lighting fixture according to the embodiment, as viewed from below. FIG. 3 is a plan view of the heat dissipation unit according to the embodiment, seen from above. FIG. 2 is a perspective view showing a heat dissipation fin according to the embodiment. FIG. 10 is a perspective view showing another example of the heat dissipation fin according to the embodiment. FIG. 10 is a perspective view showing another example of the heat dissipation fin according to the embodiment. FIG. 10 is a perspective view showing another example of the heat dissipation fin according to the embodiment. FIG. 10 is a perspective view showing another example of the heat dissipation fin according to the embodiment. FIG. 10 is a perspective view showing another example of the heat dissipation fin according to the embodiment.

Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The following description of the preferred embodiment is merely exemplary in nature and is in no way intended to limit the invention, its applications, or its uses.

The lighting fixture according to this embodiment will be described as a lighting fixture for so-called high ceilings. Note that the lighting fixture according to this embodiment is not limited to lighting fixtures for high ceilings, and may also be a lighting fixture such as a road light or street light, for example.

In the following explanation, the up/down, left/right, and front/back directions of the lighting fixture will be defined using the up/down, left/right, and front/back arrows shown in Figure 1.

As shown in Figure 1, the lighting fixture of this embodiment includes a light source unit 1, a power supply unit 2, a heat dissipation unit 3, a holding unit 4, and an arm 6.

The power supply unit 2 supplies power to the light source unit 1.

The heat dissipation section 3 dissipates heat from the light source unit 1.

The holder 4 holds the light source unit 1. The holder 4 has a top plate 41, a bottom plate 42, and a pair of first support portions 43. The pair of first support portions 43 support the top plate 41 and the bottom plate 42 with the upper surface of the bottom plate 42 facing the lower surface of the top plate 41.

The power supply unit 2 is attached to the upper surface of the top plate 41. The heat dissipation unit 3 is attached to the upper surface of the bottom plate 42. The light source unit 1 is attached to the lower surface of the bottom plate 42.

(light source unit)
As shown in FIG. 2 , the light source unit 1 includes an LED (Light Emitting Diode) module that serves as a light source, a cover 10 , and a packing 11 .

The LED module includes, for example, multiple LEDs and a mounting substrate 12. Each LED may be, for example, a conventionally known packaged white LED. The mounting substrate 12 is made of a rectangular, flat resin substrate. The mounting substrate 12 is fixed to the underside of the bottom plate 42, for example, by screws.

Multiple LEDs are mounted in a row and column on the underside of the mounting substrate 12. A receptacle connector is also mounted on the underside of the mounting substrate 12. The receptacle connector is electrically connected to the electrodes (cathode and anode) of each LED via wiring conductors formed on the underside of the mounting substrate 12.

The cover 10 is attached to the holder 4 so as to cover and conceal the LED module. The cover 10 is made of a translucent synthetic resin material such as polycarbonate resin.

The cover 10 has a main body 101 and a flange 102. The main body 101 is formed in the shape of a flat, rectangular box with an opening (not shown) on its top surface. The flange 102 is formed integrally with the main body 101 so as to protrude outward from the periphery of the opening. In other words, when the cover 10 is viewed from above, the flange 102 is formed in the shape of a rectangular frame. The cover 10 is attached to the holder 4 by screwing the flange 102 to the bottom plate 42.

The packing 11 has approximately the same shape as the flange portion 102 and is a rectangular frame when viewed from above. The packing 11 is made of, for example, a rubber material or a resin material. The packing 11 is interposed between the flange portion 102 of the cover 10 and the bottom plate 42 of the holding portion 4. The packing 11 prevents dust, water droplets, etc. from entering the cover 10.

(Power supply unit)
The power supply unit 2 has a power supply block and a case 20 that houses the power supply block therein.

The power supply block has a power conversion circuit that converts power supplied from an external power source (for example, AC power supplied from a commercial power source) into the power (DC power) required by the light source unit 1. The power conversion circuit includes, for example, a full-wave rectifier, a power factor correction circuit (step-up chopper circuit), and a DC/DC converter (step-down chopper circuit). The power supply block is configured, for example, by mounting numerous circuit components that make up the power conversion circuit on the surface of a printed wiring board. The power supply block also has an output cable with a plug connector at the end.

The case 20 is formed into a rectangular box shape with an open bottom by bending a metal plate such as a zinc steel plate. A printed wiring board on which numerous circuit components of the power supply block are mounted is screwed to the back side of the top plate of the case 20. The output cable of the power supply block is pulled into the light source unit 1 from the open bottom of the case 20 through a through-hole provided in the center of the top plate 41 of the holder 4 and a through-hole provided in the center of the bottom plate 42 of the holder 4. In other words, the output cable of the power supply block extends almost straight downward from the open bottom of the case 20 toward the light source unit 1. The output cable of the power supply block is then electrically connected to the receptacle connector of the light source unit 1 directly or via a separate electrical cable.

(heat dissipation part)
1 to 4, the heat dissipation unit 3 is composed of a plurality of heat dissipation fins 31. The plurality of heat dissipation fins 31 are fixed to the upper surface of the bottom plate 42. The plurality of heat dissipation fins 31 are arranged in a radial pattern when viewed from above.

Each heat dissipation fin 31 is made of a material with excellent thermal conductivity, such as aluminum or an aluminum alloy. In this embodiment, each heat dissipation fin 31 is formed into a roughly U-shape by bending a single rectangular aluminum plate. Specifically, each heat dissipation fin 31 has a base portion 311 and a pair of rectangular heat dissipation plates 312, 313 extending upward from both left and right edges of the base portion 311.

The base portion 311 is formed into a generally rectangular plate shape. The base portion 311 has multiple boss holes (not shown) that penetrate through it in the thickness direction. The multiple boss holes are arranged in the front-to-rear direction. The bottom plate 42 of the holding portion 4 has multiple bosses that correspond to the multiple boss holes in the base portion 311. Each heat dissipation fin 31 is fixed to the bottom plate 42 by crimping the bosses of the bottom plate 42 with the multiple bosses of the bottom plate 42 inserted into the multiple boss holes in the base portion 311.

In this way, the heat dissipation unit 3 is formed by bending each of the heat dissipation fins 31 one by one and then caulking them to the bottom plate 42. This allows for a smaller and lighter heat dissipation unit 3 than, for example, when the entire heat dissipation unit 3 is formed as a single unit using aluminum die casting.

Here, the pair of heat sinks 312, 313 are formed so as to be inclined outward relative to the base portion 311. That is, in Fig. 4, the pair of heat sinks 312, 313 are arranged so that their leading ends are spaced apart from each other. For example, the angle _θ1 of the pair of heat sinks 312, 313 relative to the base portion 311 (bottom plate 42) is approximately 85°.

The heat sink 313 also has a notch 314 formed at its tip. By forming this notch 314, the tip of the heat sink 312 of the adjacent heat sink fin 31 is prevented from coming into contact with the heat sink 313.

(holding part)
As described above, the holding portion 4 has the top plate 41 , the bottom plate 42 , and the first support portion 43 .

The top plate 41 is formed into a substantially rectangular plate shape from a metal plate such as aluminum or an aluminum alloy. The top plate 41 has a pair of first protrusions 411 and a pair of second protrusions 412 on its periphery.

The pair of first protrusions 411 are arranged to face each other in the front-to-rear direction of the top plate 41. The first protrusions 411 are formed by bending the peripheral edge of the top plate 41 so that it protrudes downward. The first protrusions 411 have a first connecting portion 413 formed approximately in the center.

The pair of second protrusions 412 are arranged to face each other in the left-right direction of the top plate 41. The second protrusions 412 are formed by bending the peripheral edge of the top plate 41 so that it protrudes upward. A second connecting portion 414 is formed approximately in the center of the second protrusions 412.

The bottom plate 42 is formed in a generally rectangular shape from a metal plate with excellent thermal conductivity, such as aluminum or an aluminum alloy. The bottom plate 42 has third protrusions 421 that protrude upward and surround the outer periphery. Each third protrusion 421 has a third connecting portion 422 formed approximately in the center in the front-to-rear direction.

Each first support portion 43 is formed by bending a single metal plate, such as a zinc steel plate.

The pair of first support portions 43 are arranged facing each other in the front-to-rear direction. The upper portion of each first support portion 43 is connected to the first connecting portion 413 of the top plate 41 by screws or the like, and the lower portion is connected to the third connecting portion 422 of the bottom plate 42. The top plate 41 and the bottom plate 42 are fixed together by this pair of first support portions 43.

(arm)
As shown in FIG. 1, the arm 6 is formed into a U-shape by bending a long metal plate such as a zinc steel plate at both ends in the longitudinal direction at approximately right angles in the same direction.

The arm 6 has both longitudinal ends attached to the second support parts 51. These second support parts 51 are connected to the second connecting parts 414 of the top plate 41 by screws or the like. In other words, the arm 6 secures the top plate 41, bottom plate 42, and first support part 43 of the holder 4 via the second support parts 51.

As described above, the second connecting portion 414 to which the second support portion 51 is connected is formed approximately in the center of the first protrusion 411 formed in the left-right direction of the top plate 41. Furthermore, the first connecting portion 413 to which the first support portion 43 is fastened is formed approximately in the center of the second protrusion 412 formed in the front-to-rear direction of the top plate 41. In other words, the arm 6 is connected in the left-to-right direction of the top plate 41 via the second support portion 51, and the bottom plate 42 is connected in the front-to-rear direction of the top plate 41 via the first support portion 43. This stabilizes the load balance of this lighting fixture.

In addition, with the screw 53 removed, the arm 6 can rotate back and forth around the screw 52. Through holes 61 are formed at both ends of the arm 6, and after the orientation of the lighting fixture has been determined, the arm 6 and second support part 51 can be fixed together by tightening the screw 53 through the through holes 61.

The lighting fixture of this embodiment is installed on the ceiling of a building by tightening nuts onto a pair of suspension bolts inserted into the bolt insertion holes of the arm 6. However, it is preferable that the lighting fixture of this embodiment be further supported by a wire or the like to prevent the lighting fixture from falling even if the arm 6 comes off the suspension bolts.

As described above, the lighting fixture according to this embodiment includes a light source unit 1 that has a light source and is attached to the bottom plate 42, and a plurality of heat dissipation fins 31 that are attached to the bottom plate 42. The heat dissipation fins 31 include a base portion 311 that is fixed to the bottom plate 42, and heat dissipation plates 312, 313 that are formed at an angle relative to the bottom plate 42.

With the above configuration, the heat sinks 312, 313 are arranged at an angle relative to the bottom plate 42, allowing for a larger surface area than when the heat sinks are arranged perpendicular to the bottom plate. Furthermore, in this case, there is no need to increase the distance between the top plate 41 and the bottom plate 42 or the area of the bottom plate 42. This allows for a more compact lighting fixture while improving its heat dissipation performance.

The pair of heat sinks 312, 313 are also inclined away from each other. This makes it easier to perform the crimping process for fixing the base portion 311 to the bottom plate 42.

The heat sink 313 also has a notch 314 at its tip. This prevents the heat sink 313 from coming into contact with the heat sink 312 of the adjacent heat sink fin 31.

(Other embodiments)
As described above, the embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to these, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made as appropriate.

Instead of the heat dissipation fins 31 in the above embodiment, the heat dissipation fins shown in Figures 5 to 9 may be arranged on the heat dissipation section 3.

In the heat dissipation fin 31 of Fig. 5, a pair of heat dissipation plates 312a, 313a are formed so as to be inclined inward relative to the base portion 311 (bottom plate 42). For example, the angle _θ2 of the pair of heat dissipation plates 312a, 313a relative to the base portion 311 is approximately 95°. In addition, a notch 314a is formed at the tip of the heat dissipation plate 312a. By forming this notch 314a, the tips of the heat dissipation plates 312a, 313a are prevented from contacting each other. Even with this configuration, the same effects as those of the above embodiment can be obtained.

In the heat dissipation fin 31 shown in Fig. 6, a pair of heat dissipation plates 312b, 313b are formed at an angle relative to the base portion 311 (bottom plate 42) so as to be parallel to each other (in the same direction). For example, the angle _θ3 of the heat dissipation plate 312b relative to the base portion 311 is approximately 85°, and the angle _θ4 of the heat dissipation plate 313b relative to the base portion 311 is approximately 95°. Even with this configuration, the same effects as those of the above-described embodiment can be obtained. Note that, although the pair of heat dissipation plates 312b, 313b are formed at an angle relative to the base portion 311 so as to be parallel to each other in Fig. 6, the angle of inclination may be different from each other.

7, a pair of heat sinks 312c, 313c are formed so as to be inclined at different angles relative to the base portion 311 (bottom plate 42). For example, the angle _θ5 of the heat sink 312b relative to the base portion 311 is approximately 80°, and the angle _θ6 of the heat sink 313b relative to the base portion 311 is approximately 95°. Even with this configuration, the same effects as those of the above embodiment can be obtained.

In the heat dissipation fin 31 shown in Figure 8, a pair of heat dissipation plates 312d, 313d are formed to be at different heights. Even with this configuration, the same effects as in the above embodiment can be obtained.

In the heat dissipation fin 31 in Figure 9, a protrusion 315 that protrudes outward is formed on the base portion 311. If the number of heat dissipation fins 31 arranged in this lighting fixture is increased to improve heat dissipation performance, it is possible to narrow the width of the base portion 311. In this case, the narrower spacing between the heat dissipation plates 312, 313 may make it difficult to secure the bottom plate 42 and the heat dissipation fins 31 by crimping. Therefore, by forming a boss hole in this protrusion 315 to fasten the bottom plate 42 and the heat dissipation fins 31, it becomes possible to secure the bottom plate 42 and the heat dissipation fins 31 by crimping.

In addition, in the above embodiment, the heat dissipation fins 31 are arranged radially when viewed from above (see Figure 3), but the arrangement of the heat dissipation fins 31 is not limited to this. For example, the heat dissipation plates 312 may be arranged in the left-right or front-to-back direction when viewed from above.

The lighting fixture disclosed herein can be installed in buildings with high ceilings, such as gymnasiums and halls, and can be used as a so-called high-ceiling lighting fixture, illuminating the lighting space from above.

REFERENCE SIGNS LIST 1 light source unit 2 power supply unit 3 heat dissipation section 31 heat dissipation fin 311 base section 312 (312a to 312d), 313 (313a to 313d) heat dissipation plate 314 (314a) notch 315 protrusion 4 holding section 41 top plate 42 bottom plate 43 first support section 51 second support section 6 arm

Claims (10)

a light source unit having a light source and attached to the bottom plate;
a plurality of heat dissipation fins attached to the bottom plate;
The heat dissipation fins are
a base portion fixed to the bottom plate;
a heat sink formed to have an inclination with respect to the bottom plate ,
The heat dissipation fins are fixed to the bottom plate by caulking . The lighting fixture described in claim 1, wherein the heat dissipation fin has a pair of heat dissipation plates at both ends of the base portion. A lighting fixture as described in claim 2, wherein the pair of heat sinks are inclined in directions away from each other. a light source unit having a light source and attached to the bottom plate;
a plurality of heat dissipation fins attached to the bottom plate;
Equipped with
The heat dissipation fins are
a base portion fixed to the bottom plate;
a heat sink formed to have an inclination with respect to the bottom plate;
and
The heat dissipation fin has a pair of the heat dissipation plates at both ends of the base portion,
The pair of heat sinks are inclined in directions approaching each other. a light source unit having a light source and attached to the bottom plate;
a plurality of heat dissipation fins attached to the bottom plate;
Equipped with
The heat dissipation fins are
a base portion fixed to the bottom plate;
a heat sink formed to have an inclination with respect to the bottom plate;
and
The heat dissipation fin has a pair of the heat dissipation plates at both ends of the base portion,
A lighting fixture, wherein the pair of heat sinks are inclined in the same direction. A lighting fixture according to any one of claims 2 to 5, wherein the pair of heat sinks have different inclination angles relative to the base plate. a light source unit having a light source and attached to the bottom plate;
a plurality of heat dissipation fins attached to the bottom plate;
Equipped with
The heat dissipation fins are
a base portion fixed to the bottom plate;
a heat sink formed to have an inclination with respect to the bottom plate;
and
The heat dissipation fin has a pair of the heat dissipation plates at both ends of the base portion,
A lighting fixture, wherein one of the pair of heat sinks has a different height from the other. a light source unit having a light source and attached to the bottom plate;
a plurality of heat dissipation fins attached to the bottom plate;
Equipped with
The heat dissipation fins are
a base portion fixed to the bottom plate;
a heat sink formed to have an inclination with respect to the bottom plate;
and
The heat sink has a notch at the tip so as not to come into contact with the heat sink of an adjacent heat sink fin. The lighting fixture described in any one of claims 1 to 7, wherein the heat sink has a protrusion formed on the base portion that protrudes outward. A lighting fixture according to any one of claims 1 to 9, wherein the plurality of heat dissipation fins are arranged radially when viewed from above.