JP2023047939A - Luminaire - Google Patents

Abstract

To downsize a luminaire while improving the heat dissipation performance of the luminaire.SOLUTION: A luminaire comprises: a light source unit 1 comprising a light source, and attached to a bottom plate 42; and a plurality of heat dissipation fins 31 attached to the bottom plate 42. The heat dissipation fins 31 comprise base parts 311 fixed to the bottom plate 42, and heat dissipation plates 312 and 313 formed so as to have an inclination with respect to the bottom plate 42.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to lighting fixtures.

2. Description of the Related Art So-called high-ceiling lighting fixtures that are installed in buildings with high ceilings such as gymnasiums and halls to illuminate a lighting space from above have been known (for example, Patent Document 1).

Patent No. 6840195

By the way, the lighting fixture of Patent Document 1 is provided with a heat sink for cooling the light source. The heat sink has a plurality of heat radiating fins. Each heat radiation fin is formed by bending one sheet metal so that each has two heat radiation plates. Moreover, each heat sink is formed so as to be perpendicular to the mounting portion of the heat sink.

In order to improve the heat dissipation performance of lighting fixtures, it is necessary to increase the surface area of the heat sink. As in Patent Document 1, when the radiator plate and the mounting portion are orthogonal to each other, in order to increase the surface area of the radiator plate, for example, the area of the plate material to which the radiator fins are attached is increased to increase the width direction of each radiator plate. It is conceivable to extend the length of each heat sink or extend the length of each heat sink in the height direction by extending the cover portion. However, these methods increase the size of the luminaire.

Therefore, an object of the present disclosure is to provide a compact lighting fixture while improving heat radiation performance.

To achieve the above object, a lighting fixture according to an embodiment of the present disclosure includes a light source unit having a light source and attached to a bottom plate; a plurality of heat dissipation fins attached to the bottom plate; has a base portion fixed to the bottom plate, and a radiator plate formed to have an inclination with respect to the bottom plate.

According to the present disclosure, it is possible to reduce the size of the lighting fixture while improving the heat dissipation performance of the lighting fixture.

The perspective view which looked at the lighting fixture which concerns on this embodiment from upper direction. The perspective view which looked at the lighting fixture which concerns on this embodiment from the downward direction. The top view which looked at the thermal radiation part which concerns on this embodiment from upper direction. FIG. 3 is a perspective view showing a heat radiation fin according to the embodiment; The perspective view which shows the other example of the radiation fin which concerns on this embodiment. The perspective view which shows the other example of the radiation fin which concerns on this embodiment. The perspective view which shows the other example of the radiation fin which concerns on this embodiment. The perspective view which shows the other example of the radiation fin which concerns on this embodiment. The perspective view which shows the other example of the radiation fin which concerns on this embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail based on the drawings. The following description of preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its applicability or its uses.

The lighting fixture according to the present embodiment will be described as an example of a so-called high-ceiling lighting fixture. In addition, the lighting fixture of this embodiment is not limited to the lighting fixture for high ceilings, For example, lighting fixtures, such as a street light or a street light, may be used.

Further, in the following description, the up/down, left/right, and front/rear directions of the lighting fixture will be defined and explained using the up/down, left/right, and front/rear arrows shown in FIG.

As shown in FIG. 1 , the lighting fixture according to this embodiment includes a light source unit 1 , a power supply unit 2 , a heat radiating section 3 , a holding section 4 and an arm 6 .

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

The radiator 3 radiates heat from the light source unit 1 .

The holding portion 4 holds the light source unit 1 . The holding portion 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 supports the top plate 41 and the bottom plate 42 with the top surface of the bottom plate 42 facing the bottom surface of the top plate 41 .

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

(light source unit)
As shown in FIG. 2 , the light source unit 1 has an LED (Light Emitting Diode) module corresponding to a light source, a cover 10 and packing 11 .

An LED module has, for example, a plurality of LEDs and a mounting board 12 . Each LED is, for example, a conventionally well-known packaged white LED. The mounting substrate 12 is composed of a rectangular plate-shaped resin substrate. The mounting board 12 is fixed to the lower surface of the bottom plate 42 by screwing, for example.

A plurality of LEDs are mounted vertically and horizontally on the lower surface of the mounting substrate 12 . A receptacle connector is mounted on the lower surface of the mounting board 12 . The receptacle connector is electrically connected to electrodes (cathode and anode) of each LED via a wiring conductor formed on the lower surface of the mounting substrate 12 .

A cover 10 is attached to the holding part 4 so as to cover the LED module. The cover 10 is made of a translucent synthetic resin material such as polycarbonate resin.

The cover 10 has a body portion 101 and a flange portion 102 . The body portion 101 is formed in a flat rectangular box shape having an opening (not shown) on the top surface. Flange portion 102 is formed integrally with body portion 101 so as to protrude outward from the peripheral edge of the opening of body portion 101 . That is, when the cover 10 is viewed from above, the flange portion 102 is formed in the shape of a rectangular frame. The cover 10 is attached to the holding portion 4 by screwing the flange portion 102 to the bottom plate 42 .

The packing 11 has substantially the same shape as the flange portion 102 and has a rectangular frame shape 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, or the like from entering the cover 10 .

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

The power supply block has a power conversion circuit that converts power supplied from an external power supply (for example, AC power supplied from a commercial power supply) into power required for the light source unit 1 (DC power). The power conversion circuit includes, for example, a full-wave rectifier, a power factor correction circuit (step-up chopper circuit), a DC/DC converter (step-down chopper circuit), and the like. A power supply block is configured, for example, by mounting a large number of circuit components constituting a 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 its tip.

The case 20 is formed in a rectangular box shape with an open bottom by bending a metal plate such as a galvanized steel plate. A printed wiring board on which many circuit components of the power supply block are mounted is screwed and fixed to the back side of the upper plate of the case 20 . The output cable of the power supply block passes from the open lower surface of the case 20 through a through hole provided in the center of the top plate 41 of the holding part 4 and through a through hole provided in the center of the bottom plate 42 of the holding part 4 to the light source. It is drawn into unit 1. That is, the output cable of the power supply block extends substantially straight downward from the open lower surface of the case 20 toward the light source unit 1 . The output cable of the power supply block is electrically connected to the receptacle connector of the light source unit 1 directly or via another electric cable.

(Heat dissipation part)
As shown in FIGS. 1 to 4, the heat radiating section 3 is composed of a plurality of heat radiating fins 31. As shown in FIG. A plurality of radiation fins 31 are fixed to the upper surface of the bottom plate 42 . The plurality of radiation fins 31 are arranged radially when viewed from above.

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

The base portion 311 is formed in a substantially rectangular plate shape. Also, the base portion 311 is provided with a plurality of boss holes (not shown) penetrating in the thickness direction. A plurality of boss holes are provided along the front-rear direction. Also, the bottom plate 42 of the holding portion 4 has a plurality of bosses corresponding to the plurality of boss holes of the base portion 311 respectively. Each radiating fin 31 is fixed to the bottom plate 42 by crimping the bosses of the bottom plate 42 while the bosses of the bottom plate 42 are inserted into the boss holes of the base portion 311 .

In this manner, the heat radiation portion 3 is formed by bending the heat radiation fins 31 one by one, and is fixed to the bottom plate 42 by caulking. Therefore, compared with the case where the heat radiating part 3 as a whole is integrally formed by aluminum die casting, for example, the size and weight of the heat radiating part 3 can be reduced.

Here, the pair of radiator plates 312 and 313 are formed so as to incline outward from each other with respect to the base portion 311 . That is, in FIG. 4, the pair of heat sinks 312 and 313 are arranged such that the tip portions thereof are separated from each other. For example, the angle _θ1 of the pair of heat sink plates 312 and 313 with respect to the base portion 311 (bottom plate 42) is about 85°.

A notch 314 is formed at the tip of the heat sink 313 . By forming this notch 314, the tip portion of the heat sink 312 of the heat sink fin 31 arranged adjacently and the heat sink 313 are prevented from coming into contact with each other.

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

The top plate 41 is formed in a substantially rectangular plate shape, for example, 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 the periphery.

The pair of first protrusions 411 are arranged to face each other in the front-rear direction of the top plate 41 . The first convex portion 411 is formed by bending the peripheral portion of the top plate 41 so as to protrude downward. A first connecting portion 413 is formed substantially in the center of the first convex portion 411 .

The pair of second protrusions 412 are arranged to face each other in the horizontal direction of the top plate 41 . The second convex portion 412 is formed by bending the peripheral portion of the top plate 41 so as to protrude upward. A second connecting portion 414 is formed substantially in the center of the second convex portion 412 .

The bottom plate 42 is formed in a substantially rectangular plate shape, for example, from a metal plate having excellent thermal conductivity, such as aluminum or an aluminum alloy. The bottom plate 42 is formed with a third protrusion 421 that protrudes upward so as to surround the outer periphery. Each of the third projections 421 is formed with a third connecting portion 422 at substantially the center in the front-rear direction.

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

The pair of first support portions 43 are arranged so as to face each other in the front-rear direction. The first support portion 43 has an upper portion connected to the first connecting portion 413 of the top plate 41 and a lower portion connected to the third connecting portion 422 of the bottom plate 42 by screws or the like. The top plate 41 and the bottom plate 42 are fixed by the 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 galvanized steel plate at both ends in the longitudinal direction substantially at right angles in the same direction.

The arms 6 are attached to the second support portions 51 at both ends in the longitudinal direction. The second support portion 51 is connected to the second connection portion 414 of the top plate 41 by screws or the like. That is, the arm 6 fixes the top plate 41 , the bottom plate 42 and the first support portion 43 of the holding portion 4 via the second support portion 51 .

As described above, the second connecting portion 414 to which the second supporting portion 51 is connected is formed substantially in the center of the first convex portion 411 formed in the horizontal direction of the top plate 41 . A first connecting portion 413 to which the first supporting portion 43 is fastened is formed substantially in the center of the second convex portion 412 formed in the front-rear direction of the top plate 41 . That is, the arm 6 is connected to the top plate 41 in the left-right direction via the second support portion 51 , and the bottom plate 42 is connected to the top plate 41 in the front-rear direction via the first support portion 43 . This stabilizes the load balance of the lighting fixture.

Further, the arm 6 is rotatable in the front-rear direction around the screw 52 when the screw 53 is removed. Through-holes 61 are formed in both ends of the arm 6 , and after the direction of the lighting fixture is determined, the arm 6 and the second support portion 51 are connected by fastening screws 53 through the through-holes 61 . can be fixed.

The lighting fixture of this embodiment is installed on the ceiling of a building by tightening nuts on a pair of suspension bolts that are inserted through the bolt insertion holes of the arm 6 . However, the lighting fixture of the present embodiment is preferably further supported by a wire or the like so that the lighting fixture does not fall even if the arm 6 comes off the hanging bolt.

As described above, the lighting fixture according to this embodiment has a light source and includes the light source unit 1 attached to the bottom plate 42 and the plurality of radiation fins 31 attached to the bottom plate 42 . The heat radiation fin 31 has a base portion 311 fixed to the bottom plate 42 and heat radiation plates 312 and 313 formed to have an inclination with respect to the bottom plate 42 .

With the above configuration, the heat sinks 312 and 313 are arranged so as to have an inclination with respect to the bottom plate 42, so that the surface area of the heat sinks is smaller than when the heat sinks are arranged perpendicular to the bottom plate. can be widened. Moreover, in this case, it is not necessary to enlarge the space between the top plate 41 and the bottom plate 42 or the area of the bottom plate 42 . Therefore, it is possible to reduce the size of the lighting fixture while improving the heat radiation performance of the lighting fixture.

Also, the pair of radiator plates 312 and 313 are inclined in a direction away from each other. This facilitates caulking for fixing the base portion 311 to the bottom plate 42 .

Moreover, the heat sink 313 has a notch 314 at its tip. Thereby, the heat sink 313 can be prevented 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 this, and can also be applied to embodiments in which modifications, replacements, additions, omissions, etc. are made as appropriate.

5 to 9 may be arranged in the heat dissipation portion 3 instead of the heat dissipation fins 31 in the above embodiment.

In the radiating fin 31 of FIG. 5, a pair of radiating plates 312a and 313a are formed so as to incline toward each other with respect to the base portion 311 (bottom plate 42). For example, the angle _θ2 of the pair of heat sinks 312a and 313a with respect to the base portion 311 is about 95°. A notch 314a is formed at the tip of the heat sink 312a. By forming the notch 314a, the tips of the heat sinks 312a and 313a are prevented from coming into contact with each other. Even with this configuration, the same effect as the above embodiment can be obtained.

In the radiating fin 31 of FIG. 6, a pair of radiating plates 312b and 313b are inclined so as to be parallel (in the same direction) to each other with respect to the base portion 311 (bottom plate 42). For example, the angle _θ3 of the heat sink 312b with respect to the base portion 311 is approximately 85°, and the angle _θ4 of the heat sink 313b with respect to the base portion 311 is approximately 95°. Even with this configuration, the same effect as the above embodiment can be obtained. In FIG. 6, the pair of heat sinks 312b and 313b are formed so as to be parallel to the base portion 311, but they may be inclined at different angles.

In the heat radiation fin 31 of FIG. 7, a pair of heat radiation plates 312c and 313c are formed so as to be inclined at different angles with respect to the base portion 311 (bottom plate 42). For example, the angle _θ5 of the heat sink 312b with respect to the base portion 311 is approximately 80°, and the angle _θ6 of the heat sink 313b with respect to the base portion 311 is approximately 95°. Even with this configuration, the same effect as the above embodiment can be obtained.

In the radiation fin 31 of FIG. 8, a pair of radiation plates 312d and 313d are formed to have different heights. Even with this configuration, the same effect as the above embodiment can be obtained.

In the radiation fin 31 of FIG. 9, the base portion 311 is formed with a projecting portion 315 projecting outward. When increasing the number of heat radiation fins 31 arranged in this lighting fixture in order to improve the heat radiation performance, it is conceivable to narrow the width direction of the base portion 311 . In this case, since the distance between the heat sinks 312 and 313 is narrowed, it may become difficult to fix the bottom plate 42 and the heat sink fins 31 by caulking. Therefore, by forming a boss hole for fastening the bottom plate 42 and the heat radiation fins 31 in the projecting portion 315, the bottom plate 42 and the heat radiation fins 31 can be fixed by caulking.

In the above-described embodiment, the heat radiation fins 31 are arranged in a radial pattern when viewed from above (see FIG. 3), but the arrangement of the heat radiation fins 31 is not limited to this. When viewed from above, the radiator plates 312 may be arranged side by side in the left-right direction or in the front-rear direction.

The lighting fixture of the present disclosure can be installed in a building with a high ceiling such as a gymnasium or hall, and can be used as a so-called high-ceiling lighting fixture that illuminates a lighting space from above.

1 light source unit 2 power supply unit 3 heat dissipation part 31 heat dissipation fin 311 base part 312 (312a to 312d), 313 (313a to 313d) heat dissipation plate 314 (314a) notch 315 protrusion 4 holding part 41 top plate 42 bottom plate 43 first Supporting Part 51 Second Supporting Part 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 radiation fins are
a base fixed to the bottom plate;
and a radiator plate that is formed to have an inclination with respect to the bottom plate. 2. The lighting fixture according to claim 1, wherein said heat radiating fins have a pair of said heat radiating plates on both ends of said base portion. The lighting fixture according to claim 2, wherein the pair of heat sinks are inclined in a direction away from each other. The lighting fixture according to claim 2, wherein the pair of heat sinks are inclined toward each other. The lighting fixture according to claim 2, wherein the pair of heat sinks are inclined in the same direction. The lighting fixture according to any one of claims 2 to 5, wherein the pair of heat sinks have different angles of inclination with respect to the bottom plate. The lighting fixture according to any one of claims 2 to 6, wherein the pair of heat sinks have different heights from one another. The lighting fixture according to any one of claims 1 to 7, wherein the heat sink has a notch at its tip so as not to come into contact with the heat sink of the adjacent heat sink. The lighting fixture according to any one of claims 1 to 7, wherein the heat sink has an outwardly protruding projection formed on the base. The lighting fixture according to any one of claims 1 to 9, wherein the plurality of heat radiation fins are arranged radially when viewed from above.

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