JP2013258102A - Lighting device - Google Patents

Abstract

An illumination device having excellent heat dissipation and waterproof properties is provided.
An illumination device includes an LED and a housing. The housing includes a top cover made of a metal die-cast product having an opening on its outer surface, and a metal that closes the opening. And heat radiating fins 20 made of an extruded product. The periphery of the portion of the upper cover 12 where the opening 13a is provided and the periphery of the base 21 of the radiating fin 20 are arranged so as to face each other, and a packing 43 is interposed therebetween. The heat dissipating fins 20 are fixed to the upper cover 12 with the packing 43 interposed, so that the packing 43 is sandwiched between the upper cover 12 and the heat dissipating fins 20 to fill the gap between them. It is in a compressed state.
[Selection] Figure 4

Description

  The present invention relates to an illumination device that emits illumination light, and more particularly to an illumination device that is intended to be installed and used outdoors.

  2. Description of the Related Art In recent years, lighting devices having a light-emitting diode (LED) as a light source have become widespread. Generally, in a lighting device, it is important to efficiently dissipate heat generated by a light source to the outside. In particular, in a lighting device equipped with an LED, when the temperature of the LED reaches a high temperature above a certain temperature, the light emission efficiency is greatly reduced and the LED itself is deteriorated, which adversely affects product performance and product life. It is known that

  Such a tendency is remarkable particularly in a high-intensity LED having a large output provided in a large-sized lighting device, and it is extremely important to design the lighting device so that the LED can efficiently dissipate heat.

  For the purpose of efficiently radiating the heat generated in the LED, for example, Japanese Unexamined Patent Application Publication No. 2011-154785 (Patent Document 1) has a configuration in which radiating fins are installed so as to be exposed to the outside on the outer surface of the housing. An outdoor lighting device is disclosed.

  In the outdoor lighting device, a radiation fin is installed so as to be exposed to the outside at a position directly above the LED housed in the housing and corresponding to the upper surface of the housing. The heat generated by the LED can be efficiently radiated to the outside through the heat radiation fin.

JP 2011-154785 A

  In the outdoor lighting device disclosed in Patent Document 1, the housing is divided into an upper cover and a lower cover, and the heat dissipating fins are formed by forming a part of the upper cover into a fin shape. The upper cover including the fin shape is composed of an aluminum die-cast product.

  Here, although the die-cast product made of aluminum has a relatively high thermal conductivity, in order to dissipate the heat generated in the lighting device more efficiently, the radiating fin is a member having a higher thermal conductivity. It is preferable to comprise. For example, as a member having higher thermal conductivity than a die-cast product made of aluminum, an extruded product made of aluminum can be mentioned.

  For lighting devices that are intended to be installed outdoors, where sufficient waterproofness is required to prevent rainwater, moisture, etc. from entering the interior of the enclosure, aluminum is used as described above. When a part of the casing is formed of an extruded molded product, waterproofing is performed between the member made of the extruded molded product and another member joined to the end surface orthogonal to the extrusion direction of the member. A power interface will occur.

  However, at the interface, because of the structure of the extrusion-molded product, it is difficult to tightly join the above members together, so that there is a problem that it is difficult to ensure sufficient waterproofness at the portion. .

  Therefore, the present invention has been made to solve the above-described problems, and an object thereof is to provide an illumination device that is excellent in heat dissipation and waterproofness.

  The illuminating device based on this invention is equipped with the light source which radiate | emits illumination light toward the exterior, and the housing | casing in which the said light source was accommodated. The housing includes a housing body made of a metal die-cast product having an opening on the outer surface, and a heat radiation fin made of a metal extrusion-molded product that closes the opening. The radiating fin includes a flat plate-like base portion and a plurality of fin portions that protrude from one main surface of the base portion and are exposed to the outside of the housing. In the illuminating device according to the present invention, the periphery of the portion of the housing body where the opening is provided and the periphery of the base of the radiating fin are arranged to face each other, and a packing is interposed therebetween. When the heat dissipating fins are fixed to the housing body in a state where the packing is performed, the packing is compressed between the housing body and the heat dissipating fins so as to fill a gap between them. It is said that.

  In the illuminating device based on the said invention, it is preferable that the said light source is attached to the other main surface of the said base of the said radiation fin.

  In the illuminating device based on the said invention, it is preferable that the packing accommodating recessed part which receives and hold | maintains the said packing is provided in the periphery of the part in which the said opening part of the said housing body was provided.

  In the illumination device according to the present invention, the light source is preferably a light emitting diode.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the illuminating device excellent in heat dissipation and waterproofness.

It is a perspective view of the illuminating device in embodiment of this invention. It is a bottom view of the illuminating device in embodiment of this invention. It is a partial exploded perspective view of the illuminating device in embodiment of this invention. It is sectional drawing which shows the internal structure and installation state of the illuminating device in embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment described below exemplifies a case where the present invention is applied to a so-called canopy lamp intended to be installed on an outdoor ceiling surface such as under an eaves. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

  FIG. 1 is a perspective view of a lighting device according to an embodiment of the present invention, and FIG. 2 is a bottom view of the lighting device shown in FIG. 3 is a partially exploded perspective view of the lighting device shown in FIG. 1, and FIG. 4 shows the internal structure and installation state of the lighting device shown in FIG. 1, along the line IV-IV in FIG. It is sectional drawing.

  As shown in FIGS. 1 to 4, the lighting device 1 mainly includes a housing 10, an LED 31, drive units 50 </ b> A and 50 </ b> B, and attachment members 60 </ b> A and 60 </ b> B.

  The housing 10 is a part constituting the outer shell of the lighting device 1 and has a space in which various components are accommodated. Here, the various components housed in the housing 10 mainly include the LED 31 and the drive units 50A and 50B described above, and details thereof will be described later.

  The casing 10 has a flat box-like shape, and is arranged orthogonal to the X-axis direction that matches one of the two orthogonal axes in the horizontal plane (that is, the front-rear direction) in the installed state. The right and left sides arranged perpendicular to the Y-axis direction that will match the other of the two orthogonal axes in the horizontal plane (i.e., the left-right direction) in the installed state, It includes an upper surface and a lower surface that are arranged orthogonal to the Z-axis direction that matches the vertical direction (that is, the vertical direction) in the installed state.

  The upper surface of the housing 10 is provided with a recess 19 that extends in a groove shape along the X-axis direction, and the recess 19 reaches both ends of the housing 10 along the X-axis direction. For this reason, the upper surface of the housing 10 has a step in the Z-axis direction, but the inner surface of the concave portion 19 constituting the step is also included in a part of the upper surface of the housing 10 here. As a result, the housing 10 has a portion having a low height (that is, a length in the Z-axis direction) at the center portion along the Y-axis direction, and a high height at both side portions along the Y-axis direction. Will have a site.

  More specifically, the housing 10 includes a bottomed box-shaped lower cover 11 having an upper surface opening, a bottomed box-shaped upper cover 12 having a lower surface opening, a cover lens 16 attached to the lower cover 11, and an upper cover. 12 and a heat dissipating fin 20 attached to 12.

  Here, an opening 11a is provided at a predetermined position of the bottom plate portion of the bottom cover 11 having a bottomed box shape, and the cover lens 16 closes the opening 11a. Moreover, the opening part 13a is provided in the predetermined position of the baseplate part of the upper cover 12 which has a bottomed box-like shape, and the radiation fin 20 has obstruct | occluded the said opening part 13a.

  The upper cover 12 is a member that defines the concave portion 19 provided on the upper surface of the casing 10 described above, and an upper right cover that constitutes a portion corresponding to the right side portion of both side portions along the Y-axis direction. 14A, the upper left cover part 14B which constitutes a portion corresponding to the left side of the both side parts along the Y-axis direction described above, and the bottom surface of the recess 19 located at the center part along the Y-axis direction. A flat central upper cover portion 13.

  The lower surface of the front surface, the rear surface, the right side surface, and the left side surface of the housing 10 is covered by a standing wall portion that is erected upward from the periphery of the bottom plate portion of the lower cover 11, and the upper portion thereof is covered by the upper cover 12. It is covered with the standing wall part erected downward from the periphery of the bottom plate part.

  The lower surface of the housing 10 includes an irradiation surface on which illumination light is irradiated downward. The peripheral portion of the lower surface of the housing 10 is covered in a frame shape by the bottom plate portion of the lower cover 11, and the central portion excluding the peripheral portion of the lower surface of the housing 10 is covered by the cover lens 16. The cover lens 16 is made of a light-transmitting member that transmits illumination light, and preferably made of a resin or glass member. Here, the exposed surface of the cover lens 16 corresponds to the irradiation surface described above for irradiating the illumination light downward.

  Of the upper surface of the housing 10, a portion corresponding to the right side portion of the both side portions along the Y-axis direction described above is covered with the upper right cover portion 14 </ b> A of the upper cover 12. The upper right cover portion 14A includes a part of the standing wall portion of the upper cover 12 described above, the upper surface of the right side portion, the front surface, the rear surface, and the right side surface of the casing 10 included in the right side portion, and the concave portion 19 described above. And the inner surface located on the right side.

  Of the upper surface of the housing 10, a portion corresponding to the left side portion of both side portions along the Y-axis direction described above is covered with the upper left cover portion 14 </ b> B of the upper cover 12. The upper left cover portion 14B includes a part of the standing wall portion of the upper cover 12 described above, the upper surface of the left side portion, the front surface, the rear surface, and the left side surface of the casing 10 included in the left side portion, and the concave portion 19 described above. It covers the inner surface located on the left side of.

  Of the upper surface of the housing 10, a portion corresponding to the central portion along the Y-axis direction described above is covered with the central upper cover portion 13 and the heat radiating fins 20 of the upper cover 12. The center upper cover portion 13 has a frame shape, and the heat radiating fins 20 block the opening portions 13a formed in the central portion excluding the peripheral portion.

  The heat radiating fin 20 is for radiating the heat generated in the LED 31 to the outside, and a flat base portion 21 which is a portion constituting the bottom surface of the concave portion 19 provided on the upper surface of the housing 10, and And a plurality of fin portions 22 projecting upward from the upper surface of the base portion 21.

  The heat radiating fins 20 are disposed on the upper surface of the housing 10 so as to be exposed to the outside, and more specifically, the plurality of fin portions 22 are positioned in the recesses 19 provided on the upper surface of the housing 10. It is arranged to do.

  The plurality of fin portions 22 are provided so as to extend along the X-axis direction so as to be parallel to each other. Thereby, the groove part which becomes a ventilation path formed between the plurality of fin parts 22 also extends along the X-axis direction, and both ends along the X-axis direction are open to the outside. It will be.

  Thereby, during the operation of the lighting device 1, the heat generated in the LED 31 is transferred to the air located in the groove formed between the plurality of fin portions 22 through the radiation fins 20. The heat is always radiated vertically upward along the Z-axis direction along the updraft generated in the part, and negative pressure is generated in the groove as the updraft is generated. Thus, air is introduced from both ends along the X-axis direction, and air contributing to heat radiation is always supplied into the groove portion. Therefore, by adopting the above configuration, a smooth air flow can be realized in the vicinity of the heat radiating fins 20, and the LED 31 can efficiently radiate heat.

  The attachment members 60A and 60B are fixtures for fixing the casing 10 to the ceiling surface 100 (see FIG. 4), and are constituted by, for example, a metal press-formed product. The attachment members 60A and 60B have an elongated flat plate-like attachment portion fixed to the ceiling surface, and a pair of flat plate-like suspension portions erected downward from both ends of the attachment portion. The lower end of the suspended portion is fixed at a predetermined position on the upper surface of the housing 10.

  Mounting holes 61 for fixing the mounting members 60A and 60B to the ceiling surface 100 are provided at predetermined positions of the mounting portions. As a result, the attachment members 60A and 60B are fixed to the ceiling surface 100 by using fittings (not shown) using the attachment holes 61, so that the lighting device 1 is installed on the ceiling surface 100 (see FIG. 4). .

  The lower cover 11, the upper cover 12, the cover lens 16, and the heat radiating fins 20 constituting the housing 10 described above are integrated by being screwed together. Here, since the space inside the housing 10 needs to be watertight with respect to the outside, a sealing process such as packing is performed between these members. The details of the sealing process using the packing will be described later.

  The space inside the casing 10 is located directly below the space above the radiating fin 20, the space directly below the upper surface of the upper right cover portion 14A, and the upper surface of the upper left cover portion 14B. It includes three spaces.

  Among these, the space located directly under the heat radiating fin 20 corresponds to the low portion of the housing 10 described above, and the space is provided in the light source unit accommodation chamber 17 in which the light source unit including the LED 31 is accommodated. Applicable. On the other hand, the space located directly below the upper surface of the upper right cover portion 14A and the space located directly below the upper surface of the upper left cover portion 14B correspond to the above-described high-height portion of the housing 10. This corresponds to the drive unit accommodation chambers 18A and 18B in which the drive units 50A and 50B including the drive circuit for driving the LED 31 are accommodated.

  The light source unit includes a plurality of LEDs 31 as light sources and an LED mounting substrate 30 that is a substrate on which the plurality of LEDs 31 are mounted. The LED mounting board 30 is configured by a printed wiring board having a substantially rectangular shape in plan view according to the shape of the housing 10, for example, and is fixed to the lower surface of the base portion 21 of the radiating fin 20 by, for example, screwing. The plurality of LEDs 31 are mounted on the lower surface of the LED mounting substrate 30 (that is, the main surface that does not face the radiation fin 20).

  Between the LED mounting substrate 30 and the base 21 of the heat radiating fin 20, a high thermal conductivity sheet or / and grease (not shown) are interposed. Thereby, the heat generated in the LED 31 is efficiently transferred to the heat radiating fins 20, and the temperature of the LED 31 is prevented from reaching a high temperature above a certain temperature.

  As the LED 31, a high-intensity LED with low power consumption and long life is used. The LEDs 31 are mounted on the lower surface of the LED mounting board 30 in an array or staggered layout, for example. Note that a white light emitting diode is preferably used as the LED 31.

  The cover lens 16 described above is disposed at a position facing the lower surface of the LED mounting substrate 30. The cover lens 16 includes a lens for appropriately squeezing or diffusing light emitted from the plurality of LEDs 31. Thereby, the light emitted from the plurality of LEDs 31 is irradiated radially downward through the cover lens 16, and the light becomes illumination light.

  The drive units 50A and 50B include a drive circuit for driving the plurality of LEDs 31 as described above. Examples of the drive circuit include a converter circuit that converts AC power into DC power, and a step-down circuit that steps down the voltage. Various circuits for converting and adjusting AC power supplied from an external power source such as a commercial power source into DC power suitable for driving the plurality of LEDs 31, such as a smoothing circuit for smoothing the voltage, are included.

  The drive units 50A and 50B are connected to the LED mounting substrate 30 by a harness (not shown) disposed inside the housing 10, and a plurality of driving units 50A and 50B are connected via a wiring pattern provided on the LED mounting substrate 30. Each of the LEDs 31 is electrically connected. The drive units 50A and 50B are connected to a connection terminal (not shown) provided at a predetermined position on the outer surface of the housing 10 via a harness (not shown) arranged inside the housing 10, thereby driving the driving unit 50A and 50B. AC power is supplied to the units 50A and 50B from the outside via the connection terminals.

  Here, in the illuminating device 1 in this Embodiment, as mentioned above, the part which covers the upper side of the housing 10 is divided | segmented into the upper cover 12 and the radiation fin 20, and is comprised.

  In other words, in the housing 10, a complicatedly shaped part such as a part for housing various components including the LED 31 and the drive units 50 </ b> A and 50 </ b> B and a part for installing the entire lighting device 1 on the ceiling surface 100 are provided. Since it is necessary to form the inside and the outside, in the present embodiment, from the viewpoint of securing the formability while ensuring the degree of freedom of shape, in the present embodiment, the lower cover 11 and the upper cover 12 that are parts constituting the part. It is supposed that the housing body consisting of is made of an aluminum die-cast product. Here, the heat conductivity of the die-cast product made of aluminum is 96 W / m · K when the die-cast aluminum ADC 12 is used as an example.

  On the other hand, in the housing 10, in particular, since it is necessary to efficiently dissipate the heat generated in the LED 31 to the outside, in the present embodiment, the heat dissipating fin 20 that is a portion to which the light source unit including the LED 31 is attached. Is made of an extruded product made of aluminum. Here, the thermal conductivity of the extruded product made of aluminum is 209 W / m · K when the aluminum 6063T5 for extrusion molding is used as an example, and is generally compared with the thermal conductivity of the die-cast product made of aluminum described above. Significantly higher.

  Therefore, with the configuration described above, the heat generated in the LED 31 is generated in the housing 10 (more specifically, the lower cover 11 and the upper cover 12 that are the housing body) while providing the housing 10 with a complicatedly shaped portion. Therefore, the heat can be efficiently radiated to the outside through the heat radiating fins 20) having a higher thermal conductivity, and the heat radiating performance can be greatly improved.

  Here, when the said structure is employ | adopted, the interface which should be waterproofed arises between the upper cover 12 and the radiation fin 20 as above-mentioned. Moreover, when the said structure is employ | adopted, the problem which an assembly operation | work will become complicated with the increase in a number of parts also arises, Furthermore, accompanying the structure of the radiation fin 20 with an extrusion molded product, Various restrictions arise in the assembly structure.

  In the illumination device 1 according to the present embodiment, these problems are solved by adopting a housing structure as described below. Hereinafter, the case structure will be described in detail with reference to FIGS. 3 and 4. 4A is a cross-sectional view of the entire lighting device 1, FIG. 4B is an enlarged cross-sectional view of the assembly portion of the lower cover 11 and the upper cover 12, and FIG. The expanded sectional view of the assembly | attachment part with the radiation fin 20 is each represented.

  On the periphery of the portion of the upper cover 12 where the opening 13a is provided, the above-described frame-shaped portion of the central upper cover portion 13 is located, and the frame-shaped portion has a flat outer surface. Yes. Further, the lower surface of the base portion 21 of the radiating fin 20 is configured to be flat, and the peripheral edge thereof is disposed to face the frame-shaped portion of the central upper cover portion 13 of the upper cover 12 described above.

  Between the periphery of the portion where the opening 13a of the upper cover 12 is provided and the periphery of the base 21 of the radiating fin 20, a substantially rectangular annular packing 43 made of, for example, silicone resin or EPDM resin is interposed. Are arranged as follows. As a result, the packing 43 is sandwiched between the upper cover 12 and the radiating fin 20 in a state where the radiating fin 20 is fixed to the upper cover 12 so as to close the opening 13 a of the upper cover 12.

  At this time, the packing 43 is compressed by the upper cover 12 and the radiating fin 20 by appropriately managing the tightening torque in the screwing operation for fixing the radiating fin 20 to the upper cover 12. Thus, in the portion where the packing 43 is interposed, the gap between the upper cover 12 and the heat radiating fin 20 is filled to ensure the sealing performance.

  With the above configuration, when assembling the housing 10, the packing 43 is disposed in advance on the periphery of the portion of the upper cover 12 where the opening 13a is provided, and in this state, the radiating fins 20 are placed from above. With a simple operation of assembling to the upper cover 12, sealing between the upper cover 12 and the radiating fin 20 can be performed, and both high waterproofness and easy assembling work can be achieved. become.

  Moreover, in the illuminating device 1 in this Embodiment, the annular groove-shaped packing accommodating recessed part 13b is formed in the part contact | abutted with the packing 43 of the upper cover 12 with the high freedom degree of shape at the time of shaping | molding so that the opening part 13a may be surrounded. It is provided in advance. Thus, when the packing 43 is received in the packing receiving recess 13b in advance, the packing receiving recess 13b receives and holds the packing 43, so that the positioning can be performed more easily. become.

  Although detailed description thereof is omitted, in the illumination device 1 according to the present embodiment, the interface between the lower cover 11 and the upper cover 12 and the interface between the lower cover 11 and the cover lens 16 are used. In this case, by adopting the above-described housing structure for the sealing process at the interface between the upper cover 12 and the heat radiating fin 20 and an approximate housing structure, the sealing process in the portion is realized.

  That is, at the interface between the lower cover 11 and the upper cover 12, a substantially rectangular annular packing 41 is interposed between the peripheral edge of the lower cover 11 and the peripheral edge of the upper cover 12, and the degree of freedom in shape during molding is increased. An annular groove-shaped packing accommodating recess 11b is provided in advance on the peripheral edge of the high lower cover 11, and the packing 41 is accommodated in this, and the packing 41 is sandwiched between the peripheral edge of the lower cover 11 and the peripheral edge of the upper cover 12, thereby packing 41. Thus, the gap between them is sealed. Further, at the interface between the lower cover 11 and the cover lens 16, a substantially rectangular annular packing 42 is interposed between the periphery of the lower cover 11 and the periphery of the cover lens 16, so that the degree of freedom in shape during molding is increased. An annular groove-shaped packing accommodating recess 11c is provided in advance on the peripheral edge of the lower lower cover 11, and the packing 42 is accommodated in this, and the packing 42 is sandwiched between the peripheral edge of the lower cover 11 and the peripheral edge of the cover lens 16 to thereby seal the packing 42. Thus, the gap between them is sealed.

  By using the lighting device 1 in the present embodiment described above, the heat generated in the LED 31 is efficiently radiated to the outside via the heat radiation fins 20 made of an aluminum-made extruded product having high thermal conductivity. In addition, the interface formed between the upper cover 12 made of an aluminum die-cast product, which is the main body of the casing, and the heat dissipating fins 20 can be reliably waterproofed by a simple assembling operation. . Therefore, by using the above-described configuration, it is possible to provide an illumination device that is easy to assemble and has excellent heat dissipation and waterproofness.

  In the above-described embodiment of the present invention, the case where the case body is divided into the upper cover and the lower cover is illustrated, but the structure of the case body is not limited to this, and a plurality of covers are further provided. This may be divided into bodies. Further, the shape of the housing body is not limited to the shape as described above, and the shape can be changed as appropriate.

  Further, in the above-described embodiment of the present invention, the casing main body composed of the lower cover and the upper cover is constituted by an aluminum die-cast product, and the heat radiation fin is constituted by an aluminum extrusion-molded product. However, the present invention is not limited to this, and the casing body may be composed of another metal die-cast product, and the heat dissipating fin may be composed of another metal extrusion-molded product. You may do it. In addition, as said other metal, iron, copper, metals other than these, these alloys, etc. are contained.

  Further, in the above-described embodiment of the present invention, the case where the present invention is applied to a canopy lamp intended to be installed on an outdoor ceiling surface is exemplified, but the present invention is not limited to being installed outdoors. Of course, this type of lighting device can be applied. Further, the present invention is particularly preferably applied to an outdoor lighting device that requires high waterproofness, but its application range is not limited to the outdoor lighting device, and is installed indoors. Of course, it is also possible to apply to a type of lighting device.

  Furthermore, although the case where this invention was applied to the illuminating device which used LED as a light source was illustrated in embodiment of this invention mentioned above, this invention is an illuminating device provided with the light source which needs a heat radiation at least. As long as it is applicable, it can be applied to any object.

  Thus, the above-described embodiment disclosed herein is illustrative in all respects and is not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Illuminating device, 10 housing, 11 lower cover, 11a opening part, 11b, 11c packing accommodation recessed part, 12 upper cover, 13 center upper cover part, 13a opening part, 13b packing accommodation recessed part, 14A upper right cover part, 14B upper left cover part , 16 Cover lens, 17 Light source unit accommodation chamber, 18A, 18B Drive unit accommodation chamber, 19 Recess, 20 Radiation fin, 21 Base, 22 Fin, 30 LED mounting substrate, 31 LED, 41-43 Packing, 50A, 50B Drive Part, 60A, 60B mounting member, 61 mounting hole, 100 ceiling surface.

Claims (4)

A lighting device comprising: a light source that emits illumination light toward the outside; and a housing that houses the light source,
The housing includes a housing body made of a metal die-cast product having an opening on the outer surface, and a heat dissipating fin made of a metal extruded product that closes the opening,
The radiating fin has a flat base portion and a plurality of fin portions provided to protrude from one main surface of the base portion and exposed to the outside of the housing,
The heat dissipating fins are arranged in a state in which the peripheral edge of the portion of the housing main body provided with the opening and the peripheral edge of the base of the heat dissipating fin are opposed to each other and the packing is interposed therebetween. By being fixed with respect to the above, the packing is in a compressed state so as to fill a gap between the packing body and the heat dissipating fins.   The lighting device according to claim 1, wherein the light source is attached to the other main surface of the base portion of the heat radiating fin.   The lighting device according to claim 1 or 2, wherein a packing housing recess for receiving and holding the packing is provided at a periphery of a portion of the housing body where the opening is provided.   The lighting device according to claim 1, wherein the light source is a light emitting diode.

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