JP2013127877A - Heat radiation structure of lighting device, and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat radiation structure of a lighting device capable of positively radiating heat from a heat generation body, and a lighting device.SOLUTION: The heat radiation structure of a lighting device using light-emitting elements includes a hollow heat sink arranged on a central section of a heat generation body including the light-emitting elements arranged in a ring shape and extended in a center axis direction of the light-emitting elements arranged in the ring shape, and a hollow inner heat sink arranged inside the heat sink. Distances from an inner peripheral surface of the heat sink passing through the center of the heat sink to an outer peripheral surface of the inner heat sink are unequal.

Description

  The present invention relates to a heat dissipation structure for a lighting device using a light emitting element and a lighting device including the same.

  In a lighting device using a light emitting element, conventionally, a heat sink that dissipates heat generated from the light emitting element is disposed only on the back surface of the substrate on which the light emitting element is mounted. However, measures to improve the heat dissipation efficiency of the lighting device are taken in order to avoid the performance degradation of the lighting device caused by insufficient heat dissipation efficiency. For example, Patent Document 1 discloses a configuration in which heat of a light emitting element is efficiently radiated by a heat radiator that supports a substrate that supports the semiconductor light emitting element and a reflector that has a heat radiation function disposed around the semiconductor light emitting element. A lighting device is disclosed.

JP 2009-129809 A

  However, there is a problem that even if the heat radiation area increases, if heat stays in the vicinity of the heat sink, a sufficient heat radiation effect cannot be obtained.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a new and improved lighting device that can actively dissipate heat from a heating element. The object is to provide a heat dissipation structure and a lighting device.

  In order to solve the above problems, according to an aspect of the present invention, a heat dissipation structure for a lighting device using a light emitting element is provided. A heat dissipation structure for a lighting device according to the present invention includes a hollow heat sink provided in the center of a heating element including a light emitting element arranged in an annular shape and extending in the central axis direction of the light emitting element arranged in an annular shape, and a heat sink And a hollow internal heat sink provided inside, the distance from the inner peripheral surface of the heat sink passing through the center of the heat sink to the outer peripheral surface of the internal heat sink is non-uniform.

  Here, the planar shape of the heat sink viewed from the central axis direction may be a circle, and the planar shape of the internal heat sink may be an ellipse or a polygon having a major axis and a minor axis.

  In order to solve the above problems, according to another aspect of the present invention, a light emitting element that emits light, a light emitting element substrate in which the light emitting elements are arranged in a ring shape, and a light emitting element substrate in which the light emitting elements are arranged A hollow heat sink that is provided in the center of a heating element including a light emitting element arranged in an annular shape and that extends in the central axis direction of the light emitting element arranged in an annular shape, and provided inside the heat sink And a hollow internal heat sink, wherein the distance from the inner peripheral surface of the heat sink through the center of the heat sink to the outer peripheral surface of the internal heat sink is non-uniform.

  Furthermore, in order to solve the said subject, according to another viewpoint of this invention, the thermal radiation structure of the illuminating device using a light emitting element is provided. A heat dissipation structure for a lighting device according to the present invention includes a hollow heat sink provided in the center of a heating element including a light emitting element arranged in an annular shape and extending in the central axis direction of the light emitting element arranged in an annular shape, and a heat sink One or a plurality of fins extending from the inner peripheral surface of the heat sink, and the distance between the inner peripheral surfaces of the heat sink passing through the center of the heat sink is non-uniform.

  Here, at least one of the plurality of fins provided on the inner peripheral surface of the heat sink may be formed to be different from the radial length of the other fins.

  Further, the fins may be arranged radially in the circumferential direction from the inner peripheral surface of the heat sink toward the center. Alternatively, each fin may extend in one direction from the inner peripheral surface of the heat sink toward the internal space.

  In order to solve the above problems, according to another aspect of the present invention, a light emitting element that emits light, a light emitting element substrate in which the light emitting elements are arranged in a ring shape, and a light emitting element substrate in which the light emitting elements are arranged A hollow heat sink provided in the center of a heating element including a light emitting element arranged in an annular shape and extending in the central axis direction of the light emitting element arranged in an annular shape, and an inner peripheral surface of the heat sink There is provided an illuminating device, wherein the distance between the inner peripheral surfaces of the heat sink passing through the center of the heat sink is non-uniform.

  As described above, according to the present invention, it is possible to provide a heat dissipation structure for a lighting device and a lighting device that can actively dissipate heat from a heating element.

It is the top view and side view which show the illuminating device which concerns on the 1st Embodiment of this invention. It is sectional drawing in the AA cut line of the illuminating device of FIG. It is a top view which shows the 2nd heat sink and 3rd heat sink which concern on the embodiment. It is a top view showing one modification of the 2nd heat sink and the 3rd heat sink concerning the embodiment. It is a top view which shows the 2nd heat sink which concerns on the 2nd Embodiment of this invention. It is a top view showing a modification of the 2nd heat sink concerning the embodiment. It is a top view showing other modifications of the 2nd heat sink concerning the embodiment.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

<1. First Embodiment>
First, with reference to FIGS. 1-3, the structure of the illuminating device 100 which concerns on the 1st Embodiment of this invention is demonstrated. FIG. 1 is a plan view and a side view showing the illumination device 100 according to the present embodiment. FIG. 2 is a cross-sectional view taken along the line AA of the illumination device 100 of FIG. FIG. 3 is a plan view showing the second heat sink 140 and the third heat sink 160 according to the present embodiment.

[1-1. Configuration of lighting apparatus]
As shown in FIGS. 1 and 2, the lighting device 100 according to the present embodiment includes a light emitting element 112 that emits light, a light emitting element substrate 110 on which the light emitting element 112 is mounted, and the light emitting element substrate 110. From the first heat sink 120, the globe part 130 covering the light emitting element substrate 110 attached to the first heat sink 120, and the second heat sink 140 and the third heat sink 160 provided in the central part of the globe part 130 Become. A disc-shaped metal substrate 150 is provided between the light emitting element substrate 110 and the first heat sink 120 to enhance the heat dissipation effect.

  As the light emitting element 112, for example, an LED (Light Emitting Diode) can be used. In the illumination device 100 according to the present embodiment, a plurality of (for example, twelve) light emitting elements 112 are arranged on the light emitting element substrate 110 at regular intervals. The light emitting element substrate 110 is an aluminum substrate, for example, and has a disk shape corresponding to the shape of the first heat sink 110 to which the light emitting element substrate 110 is fixed via the metal substrate 150. In the present embodiment, the light emitting element 112 and the light emitting element substrate 110 including these are referred to as a heating element. The heating element includes at least the light emitting element 112, and the light emitting element substrate 110 is not necessarily considered as a heating element. Further, as a heat source of the lighting device 100, in addition to a heating element including the light emitting element 112, there is a power supply circuit (not shown).

  The first heat sink 120 is a member that radiates heat from the heat source of the lighting device 100. As shown in FIGS. 1 and 2, the first heat sink 120 includes a plurality of fins 123 in a cylindrical main body 122. The first heat sink 120 may be formed of a metal material such as aluminum, may be formed of a resin material such as plastic, and the main body 122 and the fins 123 may be formed of different materials.

  A base (not shown) is provided at one end (end on the negative side of the z axis) of the main body 122, and the light emitting element substrate 110 is provided at the other end (end on the positive side of the z axis) of the main body 112. Is provided with a flange portion 124. On the outer periphery of the flange portion 124, there is an edge portion 124 a protruding toward the arrangement direction (positive direction) of the light emitting element substrate 110 in the extending direction (z direction) of the main body portion 122 so as to surround the outer periphery of the light emitting element substrate 110. Is formed. The light emitting element substrate 110 is placed on the upper surface 124 b of the flange portion 124 via the metal substrate 150. As the metal substrate 150, for example, an aluminum substrate can be used.

  A power circuit (not shown) is provided in the internal space 126 of the main body 122 of the first heat sink 120. When the main body 122 is made of a metal material, a resin layer 127 made of a resin material is provided on the inner surface of the main body 122 in order to insulate the power supply circuit from the main body 122. Or when the main-body part 122 is formed from the metal material, in order to insulate a power supply circuit from the main-body part 122, you may accommodate in the internal space 126 via an insulation case (not shown).

  The first heat sink 120 radiates heat from the heating element including the light emitting element 112 and is radiated from the power supply circuit, which is transmitted from the light emitting element 112 via the light emitting element substrate 110 and the metal substrate 150. By providing the plurality of fins 123 on the outer peripheral surface of the main body 122, the heat dissipation area can be increased and the heat dissipation efficiency can be increased.

  The globe unit 130 is a cover member formed from a member that covers the light emitting element substrate 110 attached to the first heat sink 120 and transmits light emitted from the light emitting element 112. The globe part 130 can be formed from, for example, glass or resin having transparency. The glove part 130 is formed to have a substantially hemispherical curved surface, and an opening 132 is formed at the center thereof. The center of the opening 132 is on a base axis C perpendicular to the light emitting element substrate 110 through the centers of the plurality of light emitting elements 112 arranged in a ring shape on the light emitting element substrate 110. A second heat sink 140 is inserted into the opening 132.

  The second heat sink 140 is a member (heat sink) that radiates heat from the heating element including the light emitting element 112. As shown in FIG. 2, the second heat sink 140 includes a cylindrical portion 142 and a bottom portion 144. One end of the cylindrical portion 142 on the z-axis positive direction side that opens is connected to the opening 132 of the globe portion 130. The bottom portion 144 is provided in contact with the upper surface of the light emitting element substrate 110 so that heat from the heating element is easily transmitted. The second heat sink 140 may also be formed from a metal material such as aluminum, or may be formed from a resin material such as plastic. By providing the second heat sink 140, the heat radiation area can be further increased and the heat radiation efficiency can be increased.

  The third heat sink 160 is a cylindrical hollow member (internal heat sink) that is inserted into the internal space 146 of the cylindrical portion 142 of the second heat sink 140. As shown in FIG. 2, one end of the third heat sink 160 is in contact with the bottom 144 of the second heat sink 140. Further, the other end of the third heat sink 160 is substantially at the same position as the connection portion between the opening 132 of the globe portion 130 and one end of the second heat sink 140 in the extending direction (z direction) of the second heat sink 140. It is in. The planar shape of the third heat sink 160 is substantially elliptical as shown in FIG. This is because the shape of the space 146 formed by the second heat sink 140, the inner peripheral surface 142 a of the cylindrical portion 142 and the outer peripheral surface of the third heat sink 160 is set to the z axis passing through the center O of the second heat sink 140. This is because there is a case where the plane becomes at least asymmetric with respect to the parallel plane. A detailed description of the heat dissipation structure by the second heat sink 140 and the third heat sink 160 will be described later.

[1-2. Heat dissipation structure]
The lighting device 100 according to the present embodiment includes a first heat sink 120, a second heat sink 140, and a third heat sink 160 as a heat dissipation structure for radiating heat from a heating element including the light emitting element 112 and a power supply circuit. I have. Here, the first heat sink 120 is provided on one side of the base axis C (z-axis negative direction side) with respect to the heating element, and the second heat sink 140 and the third heat sink 160 have the base axis C with respect to the heating element. Provided on the other side (z-axis positive direction side). As described above, by providing the heat sinks 120 and 140 in the vertical direction of the base axis C with the heating element as a reference, the heat radiation area can be increased and the heat radiation efficiency can be enhanced.

  Here, considering the heat dissipation structure on the other side of the base axis C (the z-axis positive direction side) with respect to the heating element, the temperature distribution of the heat dissipation by the second heat sink 140 having a circular planar shape is the inner circumference of the cylindrical portion 142. An annular distribution is formed so as to become lower from the surface toward the center. When the temperature distribution is uniform in this way, the air is difficult to convect and heat tends to stay. Then, even if the heat from the heating element is radiated to the outside through the heat sink, the heat stays in the vicinity of the lighting device 100, and a sufficient heat radiation effect cannot be obtained.

  Therefore, in the present embodiment, a third heat sink 160 having a planar shape different from that of the second heat sink 140 is provided inside the second heat sink 140. That is, the second heat sink 140 and the second heat sink 140 are arranged so that the distance from the inner peripheral surface 142a of the second heat sink 140 to the outer peripheral surface 162b of the third heat sink 160 is not uniform through the center O of the second heat sink 140. A third heat sink 160 is provided. As described above, the third heat sink 160 has a substantially elliptical plane. Due to the difference in shape between the second heat sink 140 and the third heat sink 160, a difference in heat dissipation efficiency occurs partially, and as a result, a difference in temperature distribution of heat dissipation by the heat sinks 140 and 160 occurs. Then, convection occurs in the internal space 146 formed by the inner peripheral surface 142a of the second heat sink 140 and the outer peripheral surface 160b of the third heat sink 160.

In the present embodiment, as shown in FIG. 3, air easily flows in the L ₁ portion where the distance from the inner peripheral surface 142 a of the second heat sink 140 to the outer peripheral surface 160 b of the third heat sink 160 is short. On the other hand, the length is long _{L 2} portion of the inner circumferential surface 142a of the second heat sink 140 to the outer peripheral surface 160b of the third heat sink 160 easily flows out the air. As described above, the heat dissipation structure in which the inflow and outflow of air naturally occur in the internal space 146 can prevent heat retention and positively release heat to the outside to improve the heat dissipation efficiency. Further, by providing the third heat sink 160 in addition to the second heat sink 140, the heat radiation area can be further increased and the heat radiation efficiency can be further increased.

[1-3. Modified example]
In the heat dissipation structure shown in FIG. 3 of the present embodiment, the planar shape of the second heat sink 140 is circular, but the present invention is not limited to such an example. FIG. 4 shows a modification of the heat dissipation structure on the other side (z-axis positive direction side) of the base C with reference to the heating element. In the example shown in FIG. 4, the planar shape of the second heat sink 240 is a hexagon, and the planar shape of the third heat sink 260 is a substantially elliptical shape. The planar shape of the second heat sink 240 may be a polygon other than a hexagon.

In this case, similarly to the heat dissipation structure shown in FIG. 3, the short distance L ₁ part up to the outer peripheral surface 260b of the third heat sink 260 from the inner circumferential surface 242a of the second heat sink 240 easily air flows. On the other hand, air tends to flow out in the L ₂ portion where the distance from the inner peripheral surface 242a of the second heat sink 240 to the outer peripheral surface 260b of the third heat sink 260 is long. As described above, the heat dissipation structure in which the inflow and outflow of air naturally occur in the internal space 246 can prevent the heat from staying and actively release the heat to the outside to improve the heat dissipation efficiency.

  The lighting device 100 and the heat dissipation structure thereof according to the first embodiment of the present invention have been described above. According to this embodiment, the inner peripheral surface 140a of the second heat sink 140 passes through the center O of the second heat sink 140 with respect to the heat dissipation structure on the other side (z-axis positive direction side) of the base axis C with respect to the heating element. And the distance between the outer peripheral surface 160b of the third heat sink 160 and the third heat sink 160 are non-uniform. Thereby, convection is generated in the internal space 146, and the heat dissipation efficiency can be improved.

  In the present embodiment, the planar shape of the third heat sinks 160 and 260 is an ellipse, but the present invention is not limited to this example, and may be a polygon, for example.

<2. Second Embodiment>
Next, with reference to FIG. 5, the heat radiating structure of the illumination device according to the second embodiment of the present invention will be described. FIG. 5 is a plan view showing the second heat sink 340 according to the present embodiment. The second heat sink 340 of the lighting device according to the present embodiment is provided in place of the second heat sink 140 and the third heat sink 160 of the lighting device 100 according to the first embodiment shown in FIGS. 1 and 2. Can do. Hereinafter, the heat dissipation structure on the other side (z-axis positive direction side) of the base axis C with reference to the heating element will be described in detail. In addition, since the illuminating device which can provide the 2nd heat sink 340 which concerns on this embodiment is the same as the illuminating device 100 which concerns on 1st Embodiment, the description is abbreviate | omitted here.

[2-1. Heat dissipation structure]
The lighting device according to the present embodiment includes a first heat sink 120 shown in FIGS. 1 and 2 and a second heat sink shown in FIG. 3 as a heat dissipation structure for radiating heat from a heating element including a light emitting element and a power supply circuit. Heat sink 340. The configuration of the first heat sink 120 is the same as that of the first embodiment.

  Similar to the second heat sink 140 according to the first embodiment, the second heat sink 340 includes a cylindrical portion 342 and a bottom portion 344, and further, the first heat sink 340 extends from the inner peripheral surface 342 a of the cylindrical portion 342. A plurality of fins 345 (for example, twelve fins 345a to 345l) extending toward the center O are provided. Each fin 345a to 345l may be a streamline like the fin 123 of the first heat sink 120 shown in FIGS. 1 and 2, or may be a substantially rectangular plate-like member. In the example shown in FIG. 5, the fins 345 are provided at equal intervals in the circumferential direction, but the present invention is not limited to this example, and the interval between the adjacent fins 345 can be changed as appropriate.

  The lengths L in the radial direction of the fins 345a to 345l of the second heat sink 340 are not all the same as shown in FIG. 5, but are set so that at least one is different. In the example shown in FIG. 5, the lengths of the opposing fins are the same. The fins 345b, 345f, 345h, 345l adjacent to the fins 345a, 345g having the longest length L, and the fins 345c, 345e, 345i, 345k adjacent to these fins 345a, 345g, 345k, the radial length L are shortened in this order. The length L in the radial direction is minimum at 345d and 345j.

  By making the lengths L in the radial direction of the fins 345 different, the lengths between the inner peripheral surfaces 342a passing through the center O of the second heat sink 340 are different. For example, if the fin 345 is not formed, the length between the inner peripheral surfaces 342 a is the diameter D of the second heat sink 340. Further, in the portion where the fins 345 are formed, the length d1 between the fins 345a and 345g having the largest radial length L is the smallest, and between the fins 345d and 345j having the smallest radial length L. The length d2 is the maximum.

  Thus, the shape of the internal space 346 of the second heat sink 340 is formed non-uniformly so that it may be at least asymmetric with respect to a plane passing through the center O and parallel to the z-axis. That is, the second heat sink 340 is formed so that the distance between the inner peripheral surfaces 342a of the second heat sink 340 passes through the center O of the second heat sink 340 and is not uniform. As a result, the heat dissipation efficiency of the second heat sink 340 is different, and as a result, the temperature distribution of heat dissipation becomes non-uniform. As a result, convection occurs in the internal space 346 of the second heat sink 340. As described above, the heat dissipation structure in which the inflow and outflow of air naturally occur in the internal space 346 can prevent heat retention and positively release the heat to the outside to improve the heat dissipation efficiency.

[2-2. Modified example]
In the heat dissipation structure shown in FIG. 5 of this embodiment, the fins 345 of the second heat sink 340 are arranged so as to extend radially from the inner peripheral surface 142a of the cylindrical portion 142 toward the center O. It is not limited. FIG. 6 shows a modification of the heat dissipation structure on the other side (z-axis positive direction side) of the base axis C with reference to the heating element. In the example shown in FIG. 6, the fins 445 of the second heat sink 440 are extended in one direction from the inner peripheral surface 422 a of the cylindrical portion 422.

  Specifically, as illustrated in FIG. 6, five to ten fins 445 a to 445 j facing the y direction from the inner peripheral surface 422 a of the cylindrical portion 422 are extended adjacent to each other in the x direction. The lengths L of the opposing fins 445 are the same, and the length L decreases as the distance from the center O of the second heat sink 440 increases. By making the lengths L in the radial direction of the fins 445 different, the lengths between the inner peripheral surfaces 442a passing through the center O of the second heat sink 440 are different. For example, if the fin 445 is not formed, the length between the inner peripheral surfaces 442 a is the diameter D of the second heat sink 440. Further, in the portion where the fin 445 is formed, the length d1 between the fins 445a and 445b having the maximum length L is the minimum, and the length between the fins 445g and 445h and the length between the 445i and 445j having the minimum length L. The length d2 is the maximum.

  As described above, also in the example shown in FIG. 6, the shape of the internal space 446 of the second heat sink 440 is non-uniform so that it may be at least asymmetric with respect to a plane passing through the center O and parallel to the z-axis. To form. As a result, the heat dissipation efficiency varies depending on the heat dissipation portion of the second heat sink 440, and as a result, the temperature distribution of heat dissipation becomes non-uniform. Then, convection is generated in the internal space 446 of the second heat sink 440. As described above, the heat dissipation structure in which the inflow and outflow of air naturally occur in the internal space 446 can prevent heat retention and positively release heat to the outside to improve the heat dissipation efficiency.

  Further, as a modification of the second heat sink 440 in FIG. 6, the length of the fin 545 extending in one direction from the inner peripheral surface 542a of the cylindrical portion 542 of the second heat sink 540 as shown in FIG. The length L may be increased as the distance from the center O of the second heat sink 540 increases. Therefore, in the second heat sink 540 shown in FIG. 7, the length between the inner peripheral surfaces 542a passing through the center O in the portion where the fin 545 is formed is the maximum between the fins 545a and 545b having the smallest length L. (Length d1), and the length L is the minimum between the fins 545g and 545h and 545i and 545j (length d2).

  In this way, the shape of the internal space 546 of the second heat sink 540 is formed non-uniformly so as to be at least asymmetric with respect to a plane parallel to the z axis passing through the center O, and the convection is generated in the internal space 446. May be generated.

  Heretofore, the heat dissipation structure for the illumination device according to the second embodiment of the present invention has been described. According to the present embodiment, the length of the heat dissipation structure on the other side of the base axis C (the z-axis positive direction side) with respect to the heating element is different from the inner peripheral surface 342a of the cylindrical portion 342 of the second heat sink 340. A plurality of fins 345 are provided to make the distance between the inner peripheral surfaces 342a of the internal space 346 non-uniform. Thereby, convection is generated in the internal space 346, and the heat dissipation efficiency can be improved.

  In the present embodiment, the planar shape of the second heat sink is circular. However, the present invention is not limited to this example, and may be, for example, a substantially elliptical shape or a polygonal shape.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  For example, in the above embodiment, the light emitting element substrate in which the light emitting elements are arranged in an annular shape is placed on the flange portion of the first heat sink, but the present invention is not limited to such an example. For example, the light emitting element substrate on which the light emitting element is placed may be provided on the outer peripheral surface of the second heat sink. Further, when the light emitting element substrate is provided on the flange portion or the main body portion of the flange portion of the heat sink, only one light emitting element group configured by annularly arranging a plurality of light emitting elements as shown in FIG. 2 may be arranged. Alternatively, a plurality of light emitting element groups may be arranged on concentric circles.

  Moreover, in the said embodiment, although the 2nd heat sink was a cylindrical shape with which the circle | round | yen of the same diameter continued in the extending direction, this invention is not limited to this example. For example, the second heat sink may be formed in a tapered shape having an inner diameter that increases toward the opening.

DESCRIPTION OF SYMBOLS 100 Illuminating device 110 Light emitting element board | substrate 112 Light emitting element 120 1st heat sink 122 Main body part 123 Fin 124 Flange part 127 Resin layer 130 Globe part 140,240,340,440,540 2nd heat sink 142,242,342,442,442, 542 Cylindrical part 144, 244, 344, 444, 544 Bottom 150 Metal substrate 160, 260 Third heat sink 345, 445, 545 Fin

Claims (8)

A heat dissipation structure of a lighting device using a light emitting element,
A hollow heat sink provided at the center of a heating element including a light emitting element arranged in an annular shape and extending in the central axis direction of the light emitting element arranged in an annular shape;
A hollow internal heat sink provided inside the heat sink;
With
The heat dissipating structure of a lighting device, wherein a distance from an inner peripheral surface of the heat sink passing through a center of the heat sink to an outer peripheral surface of the internal heat sink is not uniform.   2. The lighting device according to claim 1, wherein a planar shape of the heat sink as viewed from the central axis direction is a circle, and a planar shape of the internal heat sink is an ellipse or a polygon having a major axis and a minor axis. Heat dissipation structure. A light emitting element that emits light;
A light emitting element substrate in which the light emitting elements are arranged in an annular shape;
A glove part covering the light emitting element substrate on which the light emitting element is disposed;
A hollow heat sink provided in a central portion of a heating element including the light emitting elements arranged in an annular shape and extending in a central axis direction of the light emitting elements arranged in an annular shape;
A hollow internal heat sink provided inside the heat sink;
With
The lighting device according to claim 1, wherein a distance from an inner peripheral surface of the heat sink passing through a center of the heat sink to an outer peripheral surface of the internal heat sink is non-uniform. A heat dissipation structure of a lighting device using a light emitting element,
A hollow heat sink provided at the center of a heating element including a light emitting element arranged in an annular shape and extending in the central axis direction of the light emitting element arranged in an annular shape;
One or more fins extending from the inner peripheral surface of the heat sink;
With
The heat dissipating structure of the lighting device, wherein the distance between the inner peripheral surfaces of the heat sink passing through the center of the heat sink is non-uniform.   5. The heat dissipation structure for a lighting device according to claim 4, wherein at least one of the plurality of fins provided on the inner peripheral surface of the heat sink is different from a radial length of the other fins.   6. The heat dissipation structure for a lighting device according to claim 4, wherein the fins are radially arranged in a circumferential direction from an inner peripheral surface of the heat sink toward a center.   6. The heat dissipation structure for a lighting device according to claim 4, wherein each fin extends in one direction from an inner peripheral surface of the heat sink toward an internal space. A light emitting element that emits light;
A light emitting element substrate in which the light emitting elements are arranged in an annular shape;
A glove part covering the light emitting element substrate on which the light emitting element is disposed;
A hollow heat sink provided in a central portion of a heating element including the light emitting elements arranged in an annular shape and extending in a central axis direction of the light emitting elements arranged in an annular shape;
One or more fins extending from the inner peripheral surface of the heat sink;
With
The lighting device according to claim 1, wherein the distance between the inner peripheral surfaces of the heat sink passing through the center of the heat sink is non-uniform.

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