JP2007035366A - Illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination device which can be formed compactly by relaxing the heat concentrated on a light emitting diode located at middle part. <P>SOLUTION: The illumination device is composed of a base plate 6 on which a plurality of light emitting diodes 8 are mounted, a base heat sink 5 radiating the heat from the base plate 6, a base unit provided with a base reflection body 7 distributing and controlling the light from the base plate 6, a first additional base plate 10 formed into ring-shape, a first additional heat sink 9 radiating the heat from the first additional base plate 10, a first additional unit provided with a first additional reflection body 11 distributing and controlling the light from a first additional base plate 10, a second additional base plate 13 with further expanded diameter, a second additional heat sink 12 radiating the heat from the second additional base plate 13, and a second additional unit provided with a second additional reflection body 14 distributing and controlling the light from the second additional base plate 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lighting device using a light emitting diode as a light source.

  As a light source of an illumination device, a light emitting diode has been used instead of a light bulb or a fluorescent lamp because of its low power consumption and long life. For example, in the illuminating device described in Patent Literature 1, a plurality of concentric circles are arranged on the substrate and the substrate, and the pitch angle arranged concentrically from the innermost circumference to the outermost circumference is reduced. And a plurality of light emitting diodes. By arranging the light emitting diodes in this way, the arrangement of the light emitting diodes becomes sparse at the central portion side of the substrate and becomes dense at the outer peripheral portion side. It is made uniform.

JP 2004-265664 A

However, even in the illumination device described in Patent Document 1, when a light emitting diode that consumes a larger current is mounted on the substrate, or when a larger number of light emitting diodes are mounted on the substrate, heat is still generated at the center of the substrate. You will be concentrated. Then, there arises a problem that the light amount of the light emitting diode located at the center portion is reduced and a problem that the life is shortened.
In order to avoid these problems, it is necessary to further increase the pitch (interval) for arranging the light emitting diodes, which increases the size of the substrate. The area becomes large.
Accordingly, an object of the present invention is to provide a lighting device that can be formed compact by reducing the concentration of heat on a light emitting diode located in the center.

  The illuminating device of the present invention is an illuminating device including a substrate on which a plurality of light emitting diodes are mounted. The substrate is divided into a plurality of divided substrates, and the divided substrates are arranged in a frame so as not to overlap each other. It is characterized by that.

  The heat generated from the light emitting diode is conducted mainly through the substrate rather than through the air. In the lighting device of the present invention, since the substrate on which the light emitting diode is mounted is divided into a plurality of divided substrates, even if the heat generated from the light emitting diode is conducted to the divided substrate, it is not overlapped with the adjacent divided substrate. Because it is arranged so that it does not become, it does not conduct directly. Accordingly, the concentration of heat from the peripheral divided substrates on the light emitting diodes mounted on the divided substrates located in the center is alleviated. In addition, since the divided substrates are arranged so as not to overlap each other on the frame, the progress of light from the light emitting diodes is hardly hindered by other divided substrates.

  The plurality of divided boards are formed on a base board and one or more additional boards, and the base board is arranged in the center by the frame, and arranged on the illumination direction side as the additional boards are located outside. It is desirable that

  A plurality of divided boards are formed on the base board and one or more additional boards, and the base board is arranged in the center by the frame, and arranged on the illumination direction side as the additional boards are located on the outside. Thus, the base board and the one or more additional boards are not arranged in a plane but are arranged in a three-dimensional manner. That is, the space | interval of the base board used as a divided board and each extension board | substrate can be ensured widely, without increasing the area when the illuminating device of this invention is planarly viewed. Therefore, since the interval between the divided substrates can be widened, even if heat from the light emitting diode is conducted to the substrate, it is difficult to conduct to the adjacent divided substrate.

  The base substrate is a substantially circular substrate, and the extension substrate is an annular substrate arranged so as to be concentric with the base substrate as a center, thereby widening the interval between the base substrate and the extension substrate. Can be secured.

  Similarly, when the base board is a substantially rectangular board and the extension board is a substantially rectangular board placed on both sides of the base board, the distance between the base board and the extension board is the same. Can be secured widely.

  It is desirable to provide a heat sink having a base portion on which the divided substrate is mounted on one surface, and heat radiating fins erected at predetermined intervals on the other surface of the base portion.

  The heat generated from the light emitting diode and conducted to the divided substrate is conducted to the base portion on which the divided substrate is mounted. And the heat conducted to the base part is conducted to the radiation fins standing on the base part. Then, heat is radiated from the radiating fins into the air. Therefore, heat is radiated not only from the divided substrate but also from the heat radiating fins, so that the heat radiation amount can be increased. In addition, when the lighting device of the present invention is suspended from a ceiling or the like, the radiating fins are erected so as to extend in a direction opposite to the illuminating direction. Compared with what is in a state, natural convection is less likely to be disturbed by the radiating fin itself. Therefore, heat can be smoothly radiated by the radiation fins extending in the direction opposite to the illumination direction.

  The heat sink is preferably formed so that the heat radiating fin is connected to a base portion adjacent to the illumination direction side.

  When the length of the heat dissipating fin is increased, the surface area is increased and the heat dissipating efficiency is improved. However, since the distance from the heat source is increased, the fin efficiency is decreased. When radiating fins are erected on the other surface of the base part and are also formed so as to be connected to the base part adjacent to the illumination direction side, the radiating fins extend in the vertical direction from the base part. Will be formed. Therefore, the heat from the base portion is conducted to the heat radiating fin extending in the vertical direction, so that the heat radiating fin extending in the vertical direction has higher fin efficiency than the heat radiating fin of the same length extending in one direction. can do.

  The heat sink is preferably formed so that the base portion is connected to a base portion adjacent to the illumination direction side.

  By connecting the base part to the base part adjacent to the illumination direction, heat from the adjacent base part can be dissipated by the radiation fins.

  Further, the heat sink is preferably the frame on which the divided substrate is arranged. By using the heat sink as a frame, it is possible to have a function as a support for supporting the divided substrate while having a function of radiating heat from each divided substrate.

  It is desirable that the base board and the heat sink on which the base board is mounted be a basic unit, and the extension board and the heat sink on which the extension board is mounted be an extension unit.

  When the base board and the heat sink on which the base board is mounted are a basic unit and the amount of light is insufficient, an extension unit including an extension board and a heat sink on which the extension board is mounted is added. Further, when the amount of light is insufficient, an additional unit can be added to provide a lighting device according to the installation location and size.

  It is desirable that the divided substrate is provided with a reflector extending toward the divided substrate adjacent to the illumination direction side.

  Since the divided substrates are provided with reflectors extending toward the divided substrates adjacent to the illumination direction, light from the light emitting diodes mounted on the respective divided substrates is distributed by the reflectors provided on the divided substrates. Will be controlled. Therefore, even if the range of light emitted from the light emitting diode is narrow, the distance from the light emitting diode to the reflector can be shortened, so that light distribution control can be easily performed.

  On the back side of the extension board, an indirect illumination board on which a plurality of light emitting diodes are mounted is provided along the extension board, and the reflector reflects the light from the indirect illumination board in the illumination direction. Is preferably formed.

  Light from the indirect illumination board provided along the extension board on the back side of the extension board is irradiated in a direction opposite to the illumination direction. The irradiated light reflects the light from the indirect illumination substrate in the illumination direction by a reflecting portion provided on the reflector. That is, indirect illumination in which light from a light emitting diode mounted on an indirect illumination substrate is reflected by a reflector and then irradiated in the illumination direction can be achieved.

  It is desirable that a cooling fan for cooling the divided substrate is provided. If the amount of heat generated from the light-emitting diode is large, it may not be possible to cover the amount of heat released simply by naturally dissipating heat. In that case, a temperature increase of the light emitting diode can be suppressed by providing a cooling fan for forcibly cooling the divided substrate.

The lighting device of the present invention has the following effects.
(1) A substrate on which a plurality of light emitting diodes are mounted is divided into a plurality of divided substrates, and each divided substrate is arranged in a frame so that the divided substrates do not overlap with each other. Since it does not conduct directly, the heat concentration on the light emitting diode located at the center is reduced. Therefore, since the problem that the light quantity of a light emitting diode falls and the problem of shortening a lifetime can be suppressed, a lighting device can be formed compactly.
(2) A plurality of divided boards are formed on the base board and one or more additional boards, and the base board is arranged in the center by the frame, and is arranged on the illumination direction side as the additional boards are located outside. As a result, the interval between the divided substrates can be widened, so that the heat between the adjacent divided substrates can be made difficult to conduct to each other. Therefore, even if the amount of heat radiation from the light emitting diode is large, the influence on the light emitting diode can be reduced, so that the lighting device can be formed compactly.
(3) The base board is a substantially circular board, and the extension board is an annular board arranged so as to be concentric with the base board as the center, so that the distance between the base board and each extension board is increased. Since it can be widened, even if the amount of heat radiation from the light emitting diode is large, the influence on the light emitting diode can be reduced. Therefore, the lighting device can be formed compactly. Moreover, it is suitable as an alternative to light bulb illumination as a circular light source.
(4) The base board is a substantially rectangular board, and the extension board is a substantially rectangular board placed on both sides of the base board, thereby widening the distance between the base board and each extension board. Therefore, even if the amount of heat radiation from the light emitting diode is large, the influence on the light emitting diode can be reduced. Therefore, the lighting device can be formed compactly. Moreover, it is suitable as an alternative to long fluorescent lamp illumination as a light source spreading in a rectangular shape.
(5) By dissipating heat from the divided substrate by providing a heat sink having a base portion on which the divided substrate is mounted on one surface and heat radiating fins erected at predetermined intervals on the other surface of the base portion. Since heat is radiated not only from the radiating fins, the amount of heat radiated can be increased. Therefore, the influence on the light emitting diode can be further reduced. Moreover, since the heat radiation amount can be radiated smoothly, the heat radiation efficiency can be increased.
(6) Since the heat dissipation fin is formed so as to be connected to the base portion adjacent to the illumination direction side, the fin efficiency can be improved, so that the heat sink can be formed compactly.
(7) Since the base portion is formed so as to be connected to the base portion adjacent to the illumination direction side, heat from the adjacent base portion can be dissipated by the radiation fin. Efficiency can be increased.
(8) Since the heat sink is a frame on which the divided substrates are arranged, it is not necessary to add a new member as the frame, so that the number of parts can be reduced. Therefore, the lighting device can be formed to be lightweight, and the cost can be suppressed.
(9) By using the base board and the heat sink on which the base board is mounted as a basic unit, and the extension board and the heat sink on which the extension board is mounted as an extension unit, an illumination device according to the installation location and size Therefore, the applicable range can be widened.
(10) Since the divided substrate is provided with a reflector extending toward the divided substrate adjacent to the illumination direction side, the light distribution from the light emitting diode can be easily controlled. The desired light distribution can be achieved by the body. In addition, the reflector can be formed compactly.
(11) An indirect illumination board having a plurality of light emitting diodes mounted on the back side of the extension board is provided along the extension board, and the reflector reflects light from the indirect illumination board in the illumination direction. Since the reflection part is formed, light from the light emitting diode mounted on the indirect illumination substrate can be reflected by the reflector and then irradiated in the illumination direction, so that the illumination device of the present invention can be used. When viewed in plan, the number of light-emitting diodes can be increased without increasing the area, and a brighter lighting device can be formed in a compact manner.
(12) Since the temperature of the light emitting diode can be suppressed by providing the cooling fan for cooling the divided substrate, the light emitting diode can be used even if the amount of heat generated is increased by using the light emitting diode that requires a large current. Can be less affected. Therefore, it is possible to prevent the life of the light emitting diode from being shortened.

(Embodiment 1)
A lighting apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a cross-sectional view of a lighting apparatus according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of the lighting apparatus according to Embodiment 1 of the present invention.

  As shown in FIGS. 1 and 2, the lighting apparatus 1 according to Embodiment 1 of the present invention includes a basic unit 2, a first extension unit 3, and a second extension unit 4.

  The basic unit 2, the first extension unit 3, and the second extension unit 4 are detachably fixed with screws (not shown). In the lighting device 1 according to the first embodiment, the basic unit 2 is connected to the first extension unit 3 and the second extension unit 4, but only the basic unit 2 and the first extension unit 3 are connected. Furthermore, it can be set as the structure which added the expansion unit expanded in diameter to the 2nd expansion unit of the illuminating device 1. FIG.

  The basic unit 2 includes a basic heat sink 5, a base substrate 6, and a basic reflector 7.

  The basic heat sink 5 is a frame of the basic unit 2 and is erected at predetermined intervals on a circular base portion 5a on which the base substrate 6 is mounted on one surface and the other surface of the base portion 5a. In addition, a heat dissipating fin 5c provided with a substantially ring-shaped connecting portion 5b so as to be connected to the base portion 9a of the first additional heat sink 9 adjacent to the illumination direction F1 side is also provided.

  The base substrate 6 is a substantially circular printed wiring board on which a plurality of light emitting diodes 8 are concentrically mounted, and is provided with a convex portion 6a on which a terminal portion (not shown) for supplying power is formed. .

  The basic reflector 7 has a base end that surrounds the periphery of the base substrate 6 and a tip that extends toward the inner peripheral side of the extension board (first extension board 10) adjacent to the illumination direction F1 side. It is formed in a substantially cup shape. In the first embodiment, the basic reflector 7 is formed in a substantially cup shape so that the opening area gradually increases toward the illumination direction F1 while surrounding the periphery of the base substrate 6. However, it is good also as a cylindrical shape so that an opening area may not change toward the illumination direction F1.

  The first extension unit 3 includes a first extension heat sink 9, a first extension board 10, and a first extension reflector 11.

  The first additional heat sink 9 is a frame of the first additional unit 3, and has an annular base portion 9a for mounting the first additional substrate 10 on one surface, and the other surface of the base portion 9a at predetermined intervals. And a heat radiating fin 9c provided with a substantially ring-shaped connecting portion 9b so as to be connected to the base portion 12a of the second additional heat sink 12 adjacent to the illumination direction F1 side.

  The first extension board 10 is an annular printed wiring board on which a plurality of light emitting diodes 8 are mounted in a substantially circular shape, and is provided with a convex part 10a on which a terminal part (not shown) for supplying power is formed. Yes. The first extension board 10 is formed so that the inner circumference diameter is larger than the diameter of the base board 6.

  The first additional reflector 11 has a base end that surrounds the periphery of the first additional board 10 and a front end that faces the inner peripheral side of the additional board (second additional board 13) adjacent to the illumination direction F1. It is formed in a substantially cup shape so as to extend. In the first embodiment, the first additional reflector 11 is substantially cup-shaped so that the opening area gradually increases toward the illumination direction F1 while surrounding the first additional board 10. Although formed, it is good also as a cylindrical shape so that an opening area may not change toward the illumination direction F1.

  The second extension unit 4 includes a second extension heat sink 12, a second extension board 13, a second extension reflector 14, and a holding plate 15.

  The second extension heat sink 12 is a frame of the second extension unit 4, and has an annular base portion 12a on which the second extension board 13 is mounted on one surface and the other surface of the base portion 12a at predetermined intervals. And a radiating fin 12c provided with a substantially ring-shaped connecting portion 12b so as to be connected to the base portion when an expansion unit having an enlarged diameter is added to the second extension unit. .

  The second extension board 13 is an annular printed wiring board on which a plurality of light emitting diodes 8 are mounted in a substantially circular shape, and is provided with a convex part 13a on which a terminal part (not shown) for supplying power is formed. Yes. The second extension board 13 is formed so that the inner circumference diameter is larger than the outer circumference diameter of the first extension board 10.

  The second extension reflector 14 is an extension board whose base end surrounds the periphery of the second extension board 13 and whose tip is adjacent to the illumination direction F1 (a board whose diameter has been increased when an additional unit is further added). It is formed in a substantially cup shape so as to extend toward the inner peripheral side. In the first embodiment, the second additional reflector 14 is formed in a substantially cup shape so that the opening area gradually increases toward the illumination direction F1 while surrounding the second additional board 13. Although formed, it is good also as a cylindrical shape so that an opening area may not change toward the illumination direction F1.

  The holding plate 15 is an annular plate material that is attached to the connecting portion 12b of the second additional heat sink 12 and holds the second additional reflector 14 so as not to fall.

  As shown in FIG. 1, the base board 6, the first extension board 10, and the second extension board 13 are connected to the terminal portions formed on the convex portions 6a, 10a, and 13a to supply power. A cable 16 is connected.

  In the lighting device 1, the base board 6 is attached to the base portion 5 a of the basic heat sink 5, the first extension board 10 is attached to the first extension heat sink 9, and the second extension board 13 is attached to the second extension heat sink 12. ing. By being attached in this way, the base board 6 is arranged in the center, and the first extension board 10 and the second extension board 13 are arranged so as to be concentric with the base board 6 as the center, and It is arranged on the illumination direction F1 side as it is located outside, and the base board 6, the first extension board 10, and the second extension board are overlapped when viewed from the bottom (when the illumination direction F1 is viewed in reverse). It is arranged not to become.

  The usage state of the illumination device 1 according to Embodiment 1 of the present invention configured as described above will be described.

  First, by supplying power from the power supply cable 16, the light emitting diodes 8 mounted on the base board 6, the first extension board 10, and the second extension board 13 are turned on. The light from the light-emitting diode 8 that has been lit is the light that travels in the illumination direction F1, the basic reflector 7, the first additional reflector 11, and the second additional reflector 14 (hereinafter sometimes simply referred to as a reflector). Is reflected in the illumination direction F1.

  Here, the function of the reflector of the illuminating device 1 which concerns on embodiment of this invention is further demonstrated in detail with reference to FIG. 3 and FIG. FIG. 3A and FIG. 3B are schematic cross-sectional views illustrating the light distribution of a conventional lighting device. FIG. 4 is a schematic cross-sectional view for explaining the light distribution of the lighting apparatus according to Embodiment 1 of the present invention. In FIG. 3 showing a conventional lighting device, it is assumed that the same light emitting diode 8 as that of the first embodiment is mounted.

  In the lighting device 1 according to the first embodiment shown in FIG. 1 and FIG. 2, the light-emitting diodes distributed and mounted on the divided substrate divided into the base substrate 6, the first additional substrate 10 and the second additional substrate 13 As shown in FIG. 3A, for example, as a conventional illumination device 100, the same number is mounted on one substrate 101, and the opening area is surrounded by the illumination direction so as to surround the substrate 101. Assume that the reflector 102 is formed so as to gradually increase toward F2.

  Since the conventional lighting device 100 is the substrate 101 having the total area of the base substrate 6, the first additional substrate 10, and the second additional substrate 13 of the lighting device 1 according to the first embodiment, the substrate 101 The distance from the light emitting diode 8 located at the center of the reflector to the reflector 102 is longer than that of the base substrate 6 of the first embodiment. That is, the light irradiated obliquely downward from the light emitting diode 8 is not reflected by the reflector 102 but is directly directed to the outside of the conventional lighting device 100, so that the light distribution control by the reflector 102 is difficult. is there. Therefore, as shown in FIG. 3B, in order to control the light distribution of the light emitted obliquely downward from the light emitting diode 8, a reflector having a large area by increasing the length from the substrate 101 to the tip. 103 is required.

  Therefore, the lighting device 1 according to the first embodiment uses a divided substrate obtained by dividing the substrate 101 of the conventional lighting device 100 into a base substrate 6, a first additional substrate 10, and a second additional substrate 13. The board 6 is arranged in the center, and the first extension board 10 and the second extension board 13 are arranged so as to be concentric with the base board 6 as the center, and are arranged on the illumination direction F1 side as they are located outside. Therefore, the reflectors (the basic reflector 7, the first additional reflector 11, the first additional reflector 11) are mounted on the respective divided substrates (the base substrate 6, the first additional substrate 10 and the second additional substrate 13). 2 The distance to the additional reflector 14) can be reduced. Therefore, even if the length from the base end to the front end of the reflector is short, light distributed obliquely can be reflected on the reflector to control the light distribution, so the angle of the inclined surface of the reflector can be adjusted. By doing so, the desired light distribution can be easily realized, and the lighting device 1 can be formed compactly.

  The basic reflector 7 is formed so as to extend toward the inner peripheral side of the first additional board 10, and the first additional reflector 11 extends toward the inner peripheral side of the second additional board 13. Therefore, the first extension board 10 can be in a state in which the basic extension body 7 and the second extension board 13 are not inward of the first extension reflector 11, respectively. Therefore, the light reflected by the front reflector (basic reflector 7, first extension reflector 11) can travel without irradiating the back side surface of the first extension board 10 or the second extension board 13. So no waste occurs.

  Next, the heat generated from the lighted light emitting diode 8 is conducted to the base board 6, the first extension board 10 and the second extension board 13. A state when the conducted heat is dissipated in the air will be described in detail with reference to FIGS. 5 and 6. FIG. 5 is a schematic cross-sectional view illustrating heat dissipation of a conventional lighting device. FIG. 6 is a schematic cross-sectional view for explaining heat dissipation of the lighting apparatus according to Embodiment 1 of the present invention.

  In the lighting device 1 according to the first embodiment shown in FIG. 1 and FIG. 2, the light-emitting diodes distributed and mounted on the divided substrate divided into the base substrate 6, the first additional substrate 10 and the second additional substrate 13 As shown in FIG. 5, for example, the conventional lighting device 105 is mounted on one substrate 101, and the substrate 106 is provided with a heat sink 107.

  In the conventional lighting device 105, since the plurality of light emitting diodes 8 are mounted on one substrate 106, heat is concentrated on the light emitting diodes 8 mounted at the center. Even if the arrangement of the light-emitting diodes 8 mounted on the substrate 106 is made sparse on the central part side of the substrate 106 and made dense on the outer peripheral part side, the light-emitting diodes 8 that consume more current are formed on the substrate. When mounting or mounting a larger number of light emitting diodes 8 on the substrate, the heat is concentrated on the central portion of the substrate 106. Then, there arises a problem that the light amount of the light emitting diode located at the center portion is reduced and a problem that the life is shortened. Then, in order to further dissipate the heat of the substrate 106, it is necessary to erect the radiation fins 108 of the heat sink 107 on the back side of the surface of the substrate 106 where the light emitting diode 8 is mounted.

  However, the longer the heat dissipating fin 108 is, the more the heat dissipating efficiency is improved because the surface area is increased. However, since the distance from the heat source is increased, the fin efficiency is decreased. Therefore, it is necessary to make the heat radiation fin 108 longer, and it is difficult to form the conventional lighting device 105 in a compact manner. In addition, the light emitting diodes 8 are dispersed on the divided substrates (base substrate 6, first extension substrate 10, and second extension substrate 13) divided into three in the lighting device 1 (see FIG. 1) according to the first embodiment. In this case, the size of the substrate 106 is larger than that of the base substrate 6. Therefore, even if the heat dissipating fins 109 are provided around the substrate 106, the heat dissipating fins 109 are far away from the light-emitting diodes 8 serving as heat sources, and thus hardly contribute to heat dissipation.

  As shown in FIG. 6, in the lighting device 1 according to the first embodiment, the board 106 of the conventional lighting device 105 is divided into a base board 6, a first extension board 10, and a second extension board 13. Since the light emitting diodes 8 are mounted on the divided substrates, heat from the light emitting diodes 8 is not directly conducted between the divided substrates. In addition, the base board 6 is arranged in the center, and the first extension board and the second extension board 13 are arranged on the illumination direction F1 side as they are located on the outside, so that the size when viewed in plan is increased. Without any problem, the space between the base board 6, the first extension board 10, and the second extension board 13 can be ensured, and the heat can hardly be transferred between the divided boards.

  Moreover, since the area of one divided substrate is reduced by using the divided substrate, and the number of the light emitting diodes 8 to be mounted is dispersed, the light emitting diodes mounted on the base substrate 6 located in the center of the lighting device 1. 8, the concentration of heat from the surrounding first extension board 10 and second extension board 13 is alleviated.

  Further, since the area of one divided board (base board 6, first extension board 10, and second extension board 13) is small, heat sinks (basic heat sinks 5, 5) installed from the respective light emitting diodes 8 to the periphery of the division board. The distance to the radiation fins 5c, 9c, 12c of the first additional heat sink 9 and the second additional heat sink 12) can be arranged close to each other. Therefore, the heat from the light emitting diode 8 can be immediately conducted to the heat sink and radiated from the radiation fins 5c, 9c, 12c.

  Further, since the radiation fins 5c, 9c, 12c are formed to extend in the vertical direction from the base parts 5a, 9a, 12a, the heat from the base parts 5a, 9a, 12a extends to the vertical direction. It will conduct to the fins 5c, 9c, 12c. Therefore, compared with the radiation fin 108 of the conventional lighting device 105 (see FIG. 5) extending in one direction, the fins 5c, 9c, and 12c extending in the vertical direction have higher fin efficiency if they have the same length. Therefore, it can be formed compactly. Moreover, since the radiation fins 5c, 9c, and 12c are arranged concentrically in plan view, the height of the lighting device 1 can be suppressed.

  Moreover, since the radiation fins 5c, 9c, 12c are provided so as to be perpendicular to the base portions 5a, 9a, 12a, when the lighting device 1 is suspended from the ceiling, the radiation fins 5c, 9c, 12c is parallel to the vertical direction. Therefore, natural convection is less likely to be hindered by the radiating fin itself as compared with the radiating fin being inclined or horizontal. Therefore, heat can be radiated smoothly.

  As described above, the lighting device 1 according to the first embodiment can be easily formed with a desired light distribution while being compactly formed. Therefore, as an alternative to the light bulb lighting, the lighting device 1 can be suspended on the ceiling and used as a downlight. It is suitable as a light source that spreads in a circular shape by placing it at the tip of a stand installed on the floor and uprighting.

(Embodiment 2)
A lighting apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 7 is a cross-sectional view of the lighting apparatus according to Embodiment 2 of the present invention. FIG. 8 is an exploded perspective view of the lighting apparatus according to Embodiment 2 of the present invention. 7 and 8, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIGS. 7 and 8, the lighting device 20 according to the second embodiment includes a first indirect illumination board in which a plurality of light emitting diodes 8 are mounted on the back side of the first extension board 10 and the second extension board 13. 21 and a second indirect illumination board 22.

  The first indirect illumination board 21 is formed on the first extension board 10 and the second indirect illumination board 22 is formed on the second extension board 13 so that the inner circumference diameter and the outer circumference diameter are substantially equal. The first indirect illumination substrate 21 and the second indirect illumination substrate 22 are provided with convex portions 21a and 22a on which terminal portions (not shown) for supplying power are formed. Therefore, the first additional board 10 may be used as the first indirect lighting board 21 and the second additional board 13 may be used as the second indirect lighting board 22.

  Moreover, while ensuring the space which accommodates the 1st indirect illumination board | substrate 21 and the 2nd indirect illumination board | substrate 22 inside, from the light emitting diode 8 mounted in the 1st indirect illumination board | substrate 21 and the 2nd indirect illumination board | substrate 22 from In order to reflect the light in the illumination direction F3, the basic reflector 23 and the first additional reflector 24 are formed with reflecting portions 23a and 24a formed in a stepped cross section.

  In order to supply power to the base board 6, the first extension board 10, the second extension board 13, the first indirect illumination board 21, and the second indirect illumination board 22, the respective protrusions 6a, 10 a, 13 a, 21 a, 22 a are connected by a power supply cable 25.

  The basic reflector 23 has a base end that surrounds the periphery of the base substrate 6 and a tip that extends toward the inner peripheral side of the first additional board 10 adjacent to the illumination direction F3 side. Therefore, the progress of light reflected by the basic reflector 23 is less likely to be obstructed by the first extension board 10.

  Further, the first additional reflector 24 has an inner periphery of the second extension board 13 whose base end surrounds the periphery of the first extension board 10 and whose tip is extended by the inclined surface on the illumination direction F3 side. Since it is formed so as to extend toward the side, not only the light reflected by the first additional reflector 24 but also the progress of the light reflected by the basic reflector 23 can be inhibited by the second additional board 13. Few.

  Since the first indirect illumination board 21 is provided on the back side of the first extension board 10 and the second indirect illumination board 22 is provided on the back side of the second extension board 13, the first indirect illumination board 21 and the second indirect illumination board 22 are provided. The light from the light-emitting diode 8 mounted on is irradiated in a direction opposite to the illumination direction F3. However, the light is reflected in the illumination direction F <b> 3 by the reflecting portions 23 a and 24 a provided in the basic reflector 23 and the first additional reflector 24. That is, when the lighting device 20 according to the second embodiment is viewed in plan, the number of the light-emitting diodes 8 can be increased without increasing the area, and the brighter lighting device 20 can be formed in a compact manner. it can.

(Embodiment 3)
A lighting apparatus according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view illustrating an illumination device according to Embodiment 3 of the present invention. In FIG. 9, the same components as those in FIG.

  As shown in FIG. 9, the illumination device 30 according to the third embodiment includes the illumination device 20 according to the second embodiment provided with a cooling fan 31 for forced air cooling.

  The cooling fan 31 is suspended by a casing 32 mounted at the tip of the heat radiation fin 12 c of the second additional heat sink 12. The motor 34 that drives the cooling fan 31 is powered by a power supply cable 33 that supplies power to the base board 6, the first extension board 10, the second extension board 13, the first indirect lighting board 21, and the second indirect lighting board 22. Is supplied.

  Since the casing 32 is mounted at the tip of the radiation fin 12c of the second additional heat sink 12, if the casing 32 is made of a material having a high thermal conductivity such as metal, a heat radiation effect can be expected.

  Thus, by providing the cooling fan 31, even if the amount of heat generated from the light emitting diode 8 is large and it is not possible to cover the amount of heat released simply by naturally radiating heat, the temperature rise of the light emitting diode 8 can be suppressed. it can. Therefore, since the influence of heat on the light emitting diode 8 can be reduced, it is possible to prevent the life of the light emitting diode 8 from being shortened.

(Embodiment 4)
A lighting apparatus according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 10 is a schematic perspective view of a lighting apparatus according to Embodiment 4 of the present invention.

  As shown in FIG. 10, the lighting device 40 according to the fourth embodiment includes a basic unit 41, a first extension unit 42, and a second extension unit 43.

  The basic unit 41 includes a base substrate 44 formed in a long rectangular shape and a basic heat sink 45. A plurality of light emitting diodes 8 are mounted on the base substrate 44, and a connector 44 a that supplies power to the light emitting diodes 8 is mounted. The basic heat sink 45 includes a base portion 45a formed in a U-shaped cross section so that the opening gradually increases toward the illumination direction F4, and radiating fins 45b erected on the base portion 45a at predetermined intervals. ing.

  The first extension unit 42 includes a first extension board 46 disposed on both sides of the base board 44 and a first extension heat sink 47. The first extension board 46 is formed in a rectangular shape with the same length as the base board 44, and a plurality of light emitting diodes 8 are mounted in a row, and a connector 46a for supplying power to the light emitting diodes 8 is mounted. ing. The first additional heat sink 47 is connected to the base portion 45a of the basic heat sink 45 and is connected to the second additional unit at a predetermined interval between the base portion 47a formed in a substantially S-shaped cross section and the base portion 47a. The heat dissipating fins 47b are provided.

  The second extension unit 43 includes a second extension board 48 disposed on the outer side of the first extension board 46 and a second extension heat sink 49 with the base board 44 interposed therebetween. The second extension board 48 is formed in a rectangular shape having the same length as the base board 44 and the first extension board 46, and a plurality of light emitting diodes 8 are mounted in a row, and power is supplied to the light emitting diodes 8. A connector 48a is mounted. Similar to the base portion 47a of the first additional heat sink 47, the second additional heat sink 49 includes a base portion 49a formed in a substantially S shape, and radiating fins 49b erected on the base portion 49a at predetermined intervals. ing.

  The base portions 45a, 47a, 49a of the basic heat sink 45, the first additional heat sink 47, and the second additional heat sink 49 are the frames of the lighting device 40, the base substrate 44, the first additional substrate 46, In order to function as a reflector for controlling the light distribution of the light-emitting diode 8 mounted on the second extension board 48, the inner side surface thereof is processed so that the reflectance is high and diffusely reflected. Has been.

  As described above, since the light emitting diode 8 is mounted on the divided substrate obtained by dividing the light emitting diode 8 into the base substrate 44, the first additional substrate 46, and the second additional substrate 48, the heat from the light emitting diode 8 is respectively It does not conduct directly between the divided substrates. In addition, the base board 44 is arranged in the center, and the first extension board 46 and the second extension board 48 are sequentially arranged on both sides of the base board 44, and further arranged on the illumination direction F4 side as it is located outside. Therefore, the space between the base board 44, the first extension board 46, and the second extension board 48 can be secured without increasing the size in plan view. Accordingly, it is possible to make it difficult for heat to be conducted between the divided substrates.

  Moreover, since the radiation fins 45b, 47b, and 49b are formed so as to extend in the vertical direction from the light emitting diode 8 that is a heat source, the fin efficiency is high. Therefore, it can be formed more compactly than the lighting device having the heat radiation fins of the same length.

  As described above, the illumination device 40 according to the fourth embodiment has a light source that spreads in a rectangular shape by forming the base substrate 44, the first additional substrate 46, and the second additional substrate 48 in a long rectangular shape. However, similar to the illumination device 1 of the first embodiment, it is possible to easily achieve a desired light distribution while being compact, and is suitable as an alternative to the long fluorescent lamp illumination.

(Embodiment 5)
An illumination apparatus according to Embodiment 5 of the present invention will be described with reference to FIG. FIG. 11 is a schematic perspective view for explaining an illumination device according to Embodiment 5 of the present invention. In FIG. 11, the same components as those in FIG.

  As shown in FIG. 11, the illumination device 60 according to the fifth embodiment includes a first indirect illumination board 61 having a plurality of light emitting diodes 8 mounted on the back side of the first extension board 46 and the second extension board 48, 2 indirect illumination board 62.

  A plurality of light emitting diodes 8 (not shown) are mounted in a row on the first indirect lighting substrate 61 and the second indirect lighting substrate 62, and connectors 61a and 62a for supplying power to the light emitting diodes 8 are mounted. Has been. Moreover, while ensuring the space which accommodates the 1st indirect illumination board | substrate 61 and the 2nd indirect illumination board | substrate 62 inside, from the light emitting diode 8 mounted in the 1st indirect illumination board | substrate 61 and the 2nd indirect illumination board | substrate 62 In order to reflect the light in the illumination direction F <b> 5, the base 45 a of the basic heat sink 45 and the base 47 a of the first additional heat sink 47 are formed with reflection portions 45 c and 47 c formed in a stepped cross section.

  Since the first indirect illumination board 61 is provided on the back side of the first extension board 46 and the second indirect illumination board 62 is provided on the back side of the second extension board 48, the first indirect illumination board 61 and the second indirect illumination board 62 are provided. The light from the light emitting diode 8 mounted on is irradiated in a direction opposite to the illumination direction F5. However, the light is reflected in the illumination direction F5 by the reflecting portions 45c and 47c provided on the base portion 45a of the basic heat sink 45 and the base portion 47a of the first additional heat sink 47. That is, when the illumination device 40 according to Embodiment 4 is viewed in plan, the number of the light-emitting diodes 8 can be increased without increasing the area, and a brighter illumination device can be formed in a compact manner. .

  The present invention can be compactly formed by mitigating the concentration of heat on the light emitting diode located in the central portion, and is therefore suitable for a lighting device using a light emitting diode as a light source. Can be used for uplight or downlight as an alternative to lamp lighting.

It is sectional drawing of the illuminating device which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the illuminating device which concerns on Embodiment 1 of this invention. (A) And (b) is a schematic sectional drawing explaining the light distribution of the conventional illuminating device. It is a schematic sectional drawing explaining the light distribution of the illuminating device which concerns on Embodiment 1 of this invention. It is a schematic sectional drawing explaining the heat dissipation of the conventional illuminating device. It is a schematic sectional drawing explaining the heat dissipation of the illuminating device which concerns on Embodiment 1 of this invention. It is sectional drawing of the illuminating device which concerns on Embodiment 2 of this invention. It is a disassembled perspective view of the illuminating device which concerns on Embodiment 2 of this invention. It is sectional drawing explaining the illuminating device which concerns on Embodiment 3 of this invention. It is a schematic perspective view of the illuminating device which concerns on Embodiment 4 of this invention. It is a schematic perspective view explaining the illuminating device which concerns on Embodiment 5 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Basic unit 3 1st extension unit 4 2nd extension unit 5 Basic heat sink 5a Base part 5b Connection part 5c Radiation fin 6 Base board 6a Convex part 7 Basic reflector 8 Light emitting diode 9 First extension heat sink 9a Base part 9b Connecting part 9c Radiating fin 10 First additional board 10a Convex part 11 First additional reflector 12 Second additional heat sink 12a Base part 12b Connecting part 12c Radiating fin 13 Second additional board 13a Convex part 14 Second additional reflector 15 Holding plate 16 Power Supply Cable 20 Illumination Device 21 First Indirect Lighting Board 21a Convex 22 Second Indirect Illumination Substrate 22a Convex 23 Basic Reflector 23a Reflector 24 First Additional Reflector 24a Reflector 25 Power Supply Cable 30 Illuminator 31 Cooling Fan 32 Casing 33 Power supply cable 34 motor 40 lighting device 41 basic unit 42 first extension unit 43 second extension unit 44 base board 44a connector 45 basic heat sink 45a base part 45b heat radiation fin 45c reflector 46 first extension board 46a connector 47 first extension heat sink 47a base part 47b Radiation fin 47c Reflector 48 Second extension board 48a Connector 49 Second extension heat sink 49a Base part 49b Radiation fin 60 Lighting device 61 First indirect lighting board 61a Connector 62 Second indirect lighting board 62a Connector 100, 105 Conventional lighting device 101 Substrate 102, 103 Reflector 106 Substrate 107 Heat sink 108, 109 Radiation fin F1-F5 Illumination direction

Claims (12)

In a lighting device including a substrate on which a plurality of light emitting diodes are mounted,
The said board | substrate is divided | segmented into a some divided substrate, and is arrange | positioned at the flame | frame so that each divided substrate may not overlap. The plurality of divided substrates are formed on a base substrate and one or more additional substrates,
The lighting device according to claim 1, wherein the base board is arranged in the center by the frame, and the additional board is arranged on the illumination direction side as being located on the outside. The base substrate is a substantially circular substrate,
The lighting device according to claim 2, wherein the additional board is an annular board arranged to be concentric with the base board as a center. The base substrate is a substantially rectangular substrate,
The lighting device according to claim 2, wherein the additional board is a substantially rectangular board disposed on both sides of the base board. A base portion on which the divided substrate is mounted on one surface;
5. The lighting device according to claim 2, further comprising a heat sink having heat radiating fins erected at predetermined intervals on the other surface of the base portion.   6. The lighting device according to claim 5, wherein the heat sink is formed so that the radiation fin is connected to a base portion adjacent to the illumination direction side.   The lighting device according to claim 5 or 6, wherein the heat sink is formed so that the base portion is also connected to a base portion adjacent to the illumination direction side.   The lighting device according to claim 6, wherein the heat sink is the frame on which the divided substrates are arranged. The base substrate and a heat sink on which the base substrate is mounted as a basic unit,
The lighting device according to claim 8, wherein the extension board and a heat sink on which the extension board is mounted are used as an extension unit.   The lighting device according to claim 2, wherein the divided substrate is provided with a reflector that extends toward a divided substrate adjacent to the illumination direction side. On the back side of the extension board, an indirect lighting board on which a plurality of light emitting diodes are mounted is provided along the extension board,
The illumination device according to claim 10, wherein the reflector is formed with a reflection portion that reflects light from the indirect illumination substrate in an illumination direction. The lighting device according to claim 1, further comprising a cooling fan that cools the divided substrate.

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