JP2013114813A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture capable of improving efficiency of heat radiation by heat radiation fins and lightening the weight.SOLUTION: In the lighting fixture, heat generated by an LED light source 24 is radiated with a heat sink section 30 arranged on a back face side of the LED light source 24. The plurality of heat radiation fins 31 forming the heat sink section 30 are stacked at a designated interval, and the heat radiation fis 31 is cooled with air flowing between respective heat radiation fins 31. As for the stacked heat radiation fins 31, the height dimension HA2 of the heat radiation fin 31B arranged in the center section in a stacked direction is set to be small, and the height dimension HA1 of the heat radiation fins 31A arranged on both end sections in the stacked direction is set to be large. A line for connecting tops 311 of the respective heat radiation fins 31 is set to be a valley shape when viewed in a direction along faces of the heat radiation fins 31. Thus, heat radiation efficiency of the heat radiation fins 31 can be improved since air can flow between the heat radiation fins 31, and lightening of the lighting fixture can be attained.

Description

  The present invention relates to a lighting fixture having a heat sink for heat dissipation on the back side of an LED light source.

2. Description of the Related Art Conventionally, there has been known a lighting fixture having a heat sink for heat dissipation on the back side of an LED light source (see, for example, Patent Document 1).
As illustrated in FIG. 10, a lighting fixture 100 described in Patent Literature 1 includes a housing 101, and the housing 101 is fixed to a panel such as a ceiling or a wall. An engagement edge 102 projecting outward is formed on the lower end of the housing 101 over the entire circumference, and is attached in a state where the engagement edge 102 is engaged with the opening edge of the attachment hole. A main body 103 is rotatably attached to the rear of the housing 101 (upward in FIG. 10), and the main body 103 has a base 104. The base portion 104 has a heat sink portion 105 attached to the upper side and a lens portion 106 attached to the lower end.

The heat sink part 105 has a press-fitting hole 107 formed in the center, and has a large number of heat radiation fins 105 </ b> A around the press-fitting hole 107.
Note that the cylindrical portion 108 of the base portion 104 is press-fitted into the press-fit hole 107 of the heat sink portion 105 from below, whereby the base portion 104 and the heat sink portion 105 are coupled.
In addition, a mounting substrate 110 on which an LED 109 is mounted in the center is provided on the lower surface of the base portion 104 and above the lens portion 106.

  Accordingly, the light emitted from the LED 109 is irradiated downward through the lens unit 106. The heat generated at this time is transmitted from the cylindrical portion 108 of the base portion 104 to the press-fitting hole 107 of the heat sink portion 105 and is radiated by the heat radiating fins 105 </ b> A of the heat sink portion 105.

Japanese Patent Laid-Open No. 2007-134067 (FIG. 1)

However, in the lighting fixture 100 described in Patent Document 1 described above, the height of the heat dissipating fin 105A is high at the center, so that air convection is difficult to occur in natural air cooling, and heat dissipation efficiency is reduced. There was a problem that the weight also increased.
Further, when the power supply device is provided on the upper side of the radiating fin, there is a problem that the convection of air further deteriorates and the power supply device is affected by heat.

  The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a lighting fixture that can improve the heat dissipation efficiency of the heat dissipating fins and can be reduced in weight.

  The luminaire of the present invention has a heat sink part in which a plurality of radiation fins provided on the back side of the LED light source are laminated at a predetermined interval, and the height dimension of the radiation fins is small at the center in the lamination direction. The height dimension of the radiating fin increases toward both ends of the direction, and the line connecting the tops of the radiating fins has a valley shape when viewed along the surface direction of the radiating fin.

  Moreover, the lighting fixture of this invention has a heat sink part which laminated | stacked the several radiation fin provided in the back surface side of the LED light source at predetermined intervals, and the said radiation fin is low in the center of the width direction, and goes to the outer side. It is formed high, and when viewed from the stacking direction, the top of the heat dissipating fin has a valley shape.

  In the present invention, the heat radiation fins laminated have a small height dimension of the heat radiation fins arranged at the center part in the lamination direction, and a large height dimension of the heat radiation fins arranged at both end parts in the lamination direction. When viewed along the surface direction of the fin, the line connecting the tops of the heat dissipating fins has a valley shape. Thereby, for example, even when a power supply device or the like is arranged on the upper side of the heat sink portion, air flows between the heat radiating fins, so that the heat radiation efficiency by the heat radiating fins can be improved and the weight can be reduced. Equipment can be provided.

The perspective view of the lighting fixture of 1st Embodiment which concerns on this invention. (A) is a perspective view which shows the shape of the radiation fin in a heat sink part, (B) is the front view seen from B direction in (A) (A) is a perspective view of the experiment which verifies the effect which provided the cut of the heat sink part, (B) is explanatory drawing which shows a trough-shaped dimension etc. The perspective view of the lighting fixture of 2nd Embodiment which concerns on this invention. (A) is a perspective view which shows the shape of the radiation fin in a heat sink part, (B) is the front view seen from B direction in (A) (A) is a perspective view of the experiment which verifies the effect which provided the cut of the heat sink part, (B) is explanatory drawing which shows a trough-shaped dimension etc. The perspective view of the lighting fixture of 3rd Embodiment which concerns on this invention. (A) is a perspective view which shows the shape of the radiation fin in a heat sink part, (B) is the front view seen from B direction in (A) (A) is a perspective view of the experiment which verifies the effect which provided the cut of the heat sink part, (B) is explanatory drawing which shows a trough-shaped dimension etc. Cross-sectional view of a conventional lighting fixture

(First embodiment)
Hereinafter, the lighting fixture of 1st Embodiment which concerns on this invention is demonstrated using drawing.
As shown in FIG. 1, the lighting fixture 10 of 1st Embodiment which concerns on this invention is set as the downlight which embeds in the attachment hole (illustration omitted) formed in the ceiling 11 which is a to-be-attached part, and illuminates the downward direction. be able to.

The lighting fixture 10 includes a lamp 20 that houses an LED light source 24 (see FIG. 2B) and emits illumination light in a predetermined direction. The lamp 20 is rotatably supported by a columnar frame 21 so that the illumination direction can be adjusted. A collar member 22 is attached to the lower end (lower end in FIG. 1) of the frame body 21, and a plurality of (for example, three in this case) mounting springs 23 are provided radially projecting outward on the side surface of the frame body 21. It has been.
Therefore, the lamp 20 causes the ceiling member 22 to contact the lower surface of the ceiling 11, and the mounting spring 23 presses the upper surface (ceiling back) of the ceiling 11 downward. It can be attached with

The lamp 20 includes a heat sink portion 30 that radiates heat generated by the LED light source 24. In the heat sink portion 30, a plurality of thin plate-like heat radiation fins 31 are laminated and provided integrally while maintaining a predetermined interval in the horizontal direction.
On the heat radiation fin 31, a power supply device 12 that is connected to a commercial power source (not shown) wired on the back of the ceiling and supplies power for lighting the LED light source 24 is attached.

As shown in FIG. 1 and FIG. 2, a plurality of thin plate-shaped heat radiation fins 31 are stacked in the horizontal direction, and the heat radiation fins 31 </ b> B at the center in the stacking direction (the arrow A direction in FIG. 2A). The height dimension is small, and the height dimension of the radiating fin 31A increases toward both ends.
2B, when the heat sink portion 30 is viewed from the front (that is, from the direction along the surface direction of the radiation fin 31), the line 312 connecting the top portions 311 of the radiation fin 31 is the center. The shape of the valley is recessed.

FIG. 3A shows an experimental apparatus showing the effect of forming the heat radiation fins 31 of the heat sink portion 30 in a valley shape. Here, the power supply device 12 is disposed above the heat sink unit 30 and the temperature in the power supply device 12 is measured.
In addition, as shown in FIG. 3B, the dimensions of the radiation fins 31 at this time are defined. The overall width of the heat sink 30 is WA, the height of the outer radiating fin 31A is HA1, and the height of the inner radiating fin 31B is HA2. The depth is DA (see FIG. 3A).

As mentioned above, according to the lighting fixture 10 of 1st Embodiment which concerns on this invention demonstrated, the heat | fever which the LED light source 24 emitted is thermally radiated by the heat sink part 30 provided in the back side of the LED light source 24. FIG.
The plurality of radiating fins 31 constituting the heat sink unit 30 are stacked at a predetermined interval, and are cooled by the air flowing between the radiating fins 31.

The stacked heat dissipating fins 31 reduce the height dimension of the heat dissipating fins 31 </ b> B disposed at the center portion in the stacking direction and increase the height dimension of the heat dissipating fins 31 </ b> A disposed at both end portions in the stacking direction. And when it sees along the surface direction of the radiation fin 31, the line | wire which connects the top part 311 of the radiation fin 31 is made into a trough shape.
Thereby, for example, even when the power supply device 12 or the like is disposed on the upper side of the heat sink portion 30, air flows between the radiation fins 31, so that the heat radiation efficiency by the radiation fins 31 is improved and the lighting fixture 10 is reduced in weight. be able to.

(Second Embodiment)
Next, the lighting fixture of 2nd Embodiment which concerns on this invention is demonstrated.
In addition, the same code | symbol is attached | subjected to the site | part which is common in the lighting fixture 10 which concerns on 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted.

As shown in FIG. 4 and FIG. 5, in the lighting fixture 10B of the second embodiment, a plurality of thin plate-like heat radiation fins 32 are laminated at predetermined intervals in the horizontal direction in the heat sink portion 30B.
Each radiation fin 32 is formed so as to be lower in the center in the width direction (the direction of arrow A in FIG. 5A) and higher toward the outside. In addition, all the radiation fins 32 can be made into the same shape.
Accordingly, as shown in FIG. 5B, when the heat sink portion 30B is viewed from the front (that is, from the stacking direction), the top portions 321 of the radiation fins 32 have a valley shape with a recessed center.

FIG. 6A shows an experimental apparatus showing the effect of forming the heat radiation fins 32 of the heat sink portion 30B in a valley shape. Here, the power supply device 12 is arranged above the heat sink portion 30B, and the temperature in the power supply device 12 is measured.
In addition, as shown in FIG. 6B, the dimensions of the radiation fin 32 at this time are defined. The total width of the heat sink part 30B is WB, the height at the outer end of the radiation fin 32 is HB1, and the height of the radiation fin 32 at the center is HB2. The depth is DB (see FIG. 6A).

As described above, according to the lighting fixture 10 </ b> B of the second embodiment of the present invention described above, the heat generated by the LED light source 24 is radiated by the heat sink portion 30 </ b> B provided on the back side of the LED light source 24.
The plurality of radiating fins 32 constituting the heat sink portion 30B are stacked at a predetermined interval, and are cooled by the air flowing between the radiating fins 32.

In the laminated radiation fin 32, each radiation fin 32 is formed so as to be lower at the center in the width direction and higher toward the outside.
Thereby, for example, even when the power supply device 12 or the like is arranged on the upper side of the heat sink portion 30B, air flows between the heat radiating fins 32, so that the heat radiation efficiency by the heat radiating fins 32 can be improved and the weight can be reduced.

(Third embodiment)
Next, the lighting fixture of 3rd Embodiment which concerns on this invention is demonstrated.
In addition, suppose that the same code | symbol is attached | subjected to the site | part which is common in the lighting fixture 10 of 1st Embodiment mentioned above, and the lighting fixture 10B of 2nd Embodiment, and the overlapping description is abbreviate | omitted.

As shown in FIGS. 7 and 8, in the lighting fixture 10C of the third embodiment, a plurality of thin plate-shaped heat radiation fins 33 are stacked in the horizontal direction in the heat sink portion 30C.
Each radiating fin 33 has a small height dimension of the radiating fin 33B at the center in the stacking direction (the direction of arrow A in FIG. 8A), and the height dimension of the radiating fin 33A increases toward both ends in the stacking direction. growing.
Furthermore, the radiation fin 33 is formed so as to be lower in the center in the width direction (the direction of arrow C in FIG. 8A) and higher toward the outside.
Thus, as shown in FIG. 8B, when the heat sink portion 30C is viewed from the front, the line 332 connecting the top portions 331 of the radiation fins 33 has a valley shape with a recessed center.
Also, when viewed from the side, it has a valley shape with a recessed center.

FIG. 9A shows an experimental apparatus showing the effect of forming the heat dissipating fins 33 of the heat sink portion 30C in a valley shape as described above. Here, the power supply device 12 is arranged above the heat sink portion 30C, and the temperature in the power supply device 12 is measured.
Further, as shown in FIG. 9B, the dimensions of the radiation fins 33 at this time are defined. The overall width of the heat sink part 30C is WC, the height at the outer end of the radiation fin 33 is HC1, and the height of the radiation fin 33 at the center is HC2. The depth is DC (see FIG. 9A).
Furthermore, the height at the center of the radiation fin 33 when viewed from the side is HC3 (indicated in parentheses in FIG. 9B).

As described above, according to the lighting fixture 10 </ b> C of the third embodiment of the present invention described above, the heat generated by the LED light source 24 is radiated by the heat sink portion 30 </ b> C provided on the back side of the LED light source 24.
At this time, the plurality of radiating fins 33 constituting the heat sink portion 30 </ b> C are stacked at a predetermined interval, and are cooled by the air flowing between the radiating fins 33.

The heat sink portion 30 </ b> C is formed to have a valley shape both when viewed from the stacking direction and when viewed from the direction along the surface direction of the radiation fin 33.
Thereby, for example, even when the power supply device 12 or the like is arranged on the upper side of the heat sink portion 30C, air flows between the heat radiating fins 33, so that the heat radiating efficiency by the heat radiating fins 33 can be improved and the weight can be reduced.

  In addition, the lighting fixture of this invention is not limited to each embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible.

10, 10B, 10C Lighting fixture 24 LED light source 30, 30B, 30C Heat sink part 31, 32, 33 Radiation fin 311, 321, 331 Top part

Claims (2)

It has a heat sink part in which a plurality of heat dissipating fins provided on the back side of the LED light source are laminated at a predetermined interval,
The height dimension of the radiating fin is small at the center part in the stacking direction, and the height dimension of the radiating fin is increased toward the both ends in the stacking direction,
The lighting fixture whose line which connects the top part of the said radiation fin is valley shape when it sees along the surface direction of the said radiation fin. It has a heat sink part in which a plurality of heat dissipating fins provided on the back side of the LED light source are laminated at a predetermined interval,
The radiating fin is low at the center in the width direction and formed higher toward the outside,
The lighting fixture whose top part of the said radiation fin is a trough shape when it sees from the lamination direction.

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