WO2018012160A1

WO2018012160A1 - Heat sink and lighting apparatus

Info

Publication number: WO2018012160A1
Application number: PCT/JP2017/021409
Authority: WO
Inventors: 梢吾供田; 基徳島村
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2016-07-15
Filing date: 2017-06-09
Publication date: 2018-01-18
Also published as: JPWO2018012160A1; JP6664083B2

Abstract

This heat sink (10) is provided with: a cylindrical base (11) having a bottom; a plurality of fins (12) radially disposed on an outer bottom surface (110b) of a bottom section (110) of the base (11); and sub fins (13) each disposed on the outer bottom surface (110b) between two neighboring fins (12) from among the plurality of fins (12), wherein the heights of the sub fins (13) from the outer bottom surface (110b) are lower than the heights of the pins (12) from the outer bottom surface (110b).

Description

Heat sink and lighting fixture

The present invention relates to a heat sink and a lighting fixture including the heat sink.

Conventionally, a lamp including an LED (Light Emitting Diode) as a light source includes a heat sink that dissipates heat generated by the light source (see, for example, Patent Document 1). The heat sink described in Patent Document 1 has a plurality of fins arranged in a radial pattern, thereby improving heat dissipation performance.

JP 2014-212059 A

However, the conventional heat sink cannot be said to have sufficiently high heat dissipation performance.

Therefore, an object of the present invention is to provide a heat sink having high heat dissipation performance and a lighting fixture including the heat sink.

In order to achieve the above object, a heat sink according to one aspect of the present invention includes a bottomed cylindrical base, a plurality of fins radially disposed on an outer bottom surface of the bottom of the base, and the plurality of fins. A sub fin disposed on the outer bottom surface between two adjacent fins, and the height of the sub fin from the outer bottom surface is lower than the height of the fin from the outer bottom surface.

For example, the lighting fixture which concerns on 1 aspect of this invention is equipped with the said heat sink and the light source attached to the inner bottom face of the said bottom part.

According to the present invention, a heat sink having high heat dissipation performance can be provided.

FIG. 1 is a perspective view of a lighting apparatus according to an embodiment. FIG. 2 is a cross-sectional view of the lighting fixture according to the embodiment. FIG. 3 is an exploded perspective view showing a part of the lighting apparatus according to the embodiment. FIG. 4 is a perspective view of a heat sink (apparatus body) according to the embodiment. FIG. 5 is a top view of the heat sink according to the embodiment. FIG. 6 is a bottom view of the base according to the embodiment. FIG. 7 is a cross-sectional view of the base according to the embodiment taken along line VII-VII in FIG. FIG. 8 is a perspective view of the fin according to the embodiment. FIG. 9 is a top view of the fin according to the embodiment. FIG. 10 is a cross-sectional view of the heat sink according to the embodiment taken along line XX of FIG. FIG. 11 is an enlarged cross-sectional view of a main part showing an area XI in FIG. FIG. 12 is a perspective view showing a fin and base positioning step in the heat sink manufacturing method according to the embodiment. FIG. 13: is sectional drawing which shows the plastic deformation process of the projection part in the manufacturing method of the heat sink concerning embodiment. FIG. 14 is a cross-sectional view for explaining the insulation distance from the LED according to the comparative example to the inner bottom surface of the base. FIG. 15 is a cross-sectional view for explaining an insulation distance from the LED to the inner bottom surface of the base according to the embodiment.

Hereinafter, the heat sink and the lighting fixture according to the embodiment of the present invention will be described in detail with reference to the drawings. Each of the embodiments described below shows a specific example of the present invention. Therefore, numerical values, shapes, materials, components, arrangement and connection forms of components, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

Each figure is a schematic diagram and is not necessarily shown strictly. Therefore, for example, the scales and the like do not necessarily match in each drawing. Moreover, in each figure, the same code | symbol is attached | subjected about the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment)
[lighting equipment]
First, the outline | summary of the lighting fixture which concerns on this Embodiment is demonstrated using FIG.1 and FIG.2.

FIG. 1 is a perspective view of a lighting fixture 1 according to the present embodiment. FIG. 2 is a cross-sectional view of the lighting fixture 1 according to the present embodiment. Specifically, FIG. 2 shows a cross section passing through the optical axis J of the luminaire 1 (cross section taken along line II-II in FIG. 5 described later).

In each figure, the direction parallel to the optical axis J is the Z-axis direction, the two directions perpendicular to the optical axis J and perpendicular to each other are the X-axis direction and the Y-axis direction. In the present embodiment, the Z-axis direction is, for example, the vertical direction.

The luminaire 1 is an example of an embedded luminaire such as a downlight. For example, the luminaire 1 is embedded in a mounting hole provided in a ceiling of a building and irradiates light downward (such as a floor). In addition, FIG. 1 has shown the lighting fixture 1 when it looks up from diagonally downward.

In the present embodiment, as shown in FIG. 1, the luminaire 1 includes a heat sink 10, an optical member 60, a frame body 70, and an attachment spring 80. Furthermore, as shown in FIG. 2, the lighting fixture 1 includes a light source 20, a mounting member 30, a connecting member 40, and a reflecting member 50.

Hereinafter, each component (component) of the lighting fixture 1 will be described in detail with reference to FIGS. 1 and 2 as appropriate. In addition, although detailed description is abbreviate | omitted except for one part, the fixing members, such as the latching | locking part or screw for connecting and fixing component members, are suitably provided in the lighting fixture 1.

[Heat sink (equipment body)]
The heat sink 10 is a fixture body of the lighting fixture 1 and is a metal member to which the light source 20 is attached. The heat sink 10 dissipates heat generated by the light source 20. The heat sink 10 is formed from a metal material having high thermal conductivity such as aluminum.

As shown in FIGS. 1 and 2, the heat sink 10 includes a base 11 and a plurality of fins 12. As will be described in detail later, the heat sink 10 further includes one or more sub fins 13 (see FIG. 4 and the like). The detailed structure of the heat sink 10 will be described later.

[light source]
The light source 20 is an example of a light source in the lighting fixture 1 and is a light emitting unit that emits light of a predetermined color (wavelength) such as white. The light source 20 is attached to the base 11 of the heat sink 10. In the present embodiment, as illustrated in FIG. 2, the light source 20 is fixed to the mounted portion 112 of the bottom portion 110 of the base 11 by the mounting member 30 and the connecting member 40.

2 and 3, the light source 20 is an LED module including a substrate 21 and a plurality of LEDs 22. The light source 20 is a so-called COB (Chip On Board) module in which a bare chip (LED 22) is directly mounted on the substrate 21.

FIG. 3 is an exploded perspective view showing a part of the lighting fixture 1 according to the present embodiment. Specifically, FIG. 3 shows the heat sink 10, the light source 20, the attachment member 30, and the connection member 40.

As the substrate 21, for example, a ceramic substrate, a resin substrate, a metal base substrate, or the like can be used. The planar view shape of the substrate 21 is, for example, a rectangle, but may be a polygon such as a hexagon or an octagon, or a circle. Metal wiring (not shown) is formed on the substrate 21, and the plurality of LEDs 22 are electrically connected.

The LED 22 is an example of a light emitting element, and is a semiconductor light emitting element that emits light with a predetermined power. The LED 22 is, for example, a bare chip that emits monochromatic visible light. Specifically, the LED 22 is a blue light emitting LED chip that emits blue light when energized. The plurality of LEDs 22 are arranged in a plurality of rows or a matrix on the main surface of the substrate 21.

The plurality of LEDs 22 are collectively sealed by a sealing member (not shown). For example, the plurality of LEDs 22 may be collectively sealed for each element row, or all the LEDs 22 on the substrate 21 may be collectively sealed.

The sealing member includes, for example, a translucent resin material such as silicone resin as a main component, and includes a wavelength conversion material that converts the wavelength of light from the LED 22. The wavelength conversion material is, for example, phosphor particles, and specifically, yellow phosphor particles. In the present embodiment, the light source 20 emits white light by mixing the blue light emitted from the LED 22 and the yellow light emitted when the yellow phosphor particles are excited by the blue light. The sealing member may contain a light diffusing material (light scattering particles) such as silica (SiO ₂ ).

The light source 20 may be an SMD (Surface Mounted Device) type module. Specifically, a package type LED element (SMD type LED element) may be mounted on the substrate 21. The package type LED element includes, for example, a resin container having a recess (cavity), an LED chip (LED 22) mounted in the recess, and a sealing member (phosphor-containing resin) sealed in the recess. With.

[Mounting member]
The attachment member 30 is a member for attaching the light source 20 to the attached portion 112 of the base 11. In the present embodiment, the attachment member 30 functions as a frame for the light source 20. Specifically, the attachment member 30 regulates the position of the light source 20 in the lateral direction (directions orthogonal to the optical axis J (X-axis direction and Y-axis direction)).

As shown in FIG. 3, the attachment member 30 includes a restriction portion 31 and a claw portion 32.

The restricting portion 31 is a rectangular frame portion having an opening 33 at the center. The opening 33 has a shape (for example, a rectangle) corresponding to the substrate 21 of the light source 20, and the light source 20 is disposed in the opening 33.

The claw portion 32 is a claw-shaped portion for supporting the reflecting member 50. In the present embodiment, the two claw portions 32 are erected from the restricting portion 31 in the direction along the optical axis J (the negative side in the Z-axis direction).

The mounting member 30 is disposed on the bottom 110 of the base 11 and is fixed to the bottom 110 by the connecting member 40 and the screw 91. Specifically, as shown in FIG. 3, the restricting portion 31 and the bottom portion 110 are provided with two screw holes 34 and two screw holes 115, respectively. The screw 91 is inserted into the screw hole 34 of the restricting portion 31 and screwed into the screw hole 115 of the bottom portion 110, whereby the attachment member 30 is fixed to the bottom portion 110.

The mounting member 30 is integrally formed using a resin material such as polybutylene terephthalate (PBT) or ABS (acrylonitrile / butadiene / styrene).

[Connecting member]
The connection member 40 is a member to which an electric wire (not shown) that supplies current to the light source 20 is connected. As shown in FIG. 3, in the present embodiment, the luminaire 1 includes two connection members 40. One of the two connecting members 40 is connected to a high potential side electric wire, and the other is connected to a low potential side electric wire.

In the present embodiment, the connection member 40 includes a main body 41 and an electrode 42 as shown in FIG.

The main body 41 is a resin casing for supporting the electric wire. A screw hole 43 is provided in the main body 41 of the connection member 40. In the present embodiment, the screw 91 is inserted into the screw hole 43 and screwed into the screw hole 34 of the restricting portion 31 and the screw hole 115 of the bottom portion 110, so that the connecting member 40 sandwiches the attachment member 30 and the bottom portion 110. Fixed to.

Also, a part of the main body 41 presses the substrate 21 toward the bottom 110. Thereby, the connection member 40 has a function of regulating the position of the light source 20 in the direction along the optical axis J (Z-axis direction).

The electrode 42 is electrically connected to an electric wire (not shown) supported by the main body 41 and electrically connected to an electrode terminal provided on the substrate 21 of the light source 20. For example, the electrode 42 is formed in the shape of a leaf spring and presses the electrode terminal toward the attached portion 112 by its urging force. Thereby, the electrode 42 and the electrode terminal of the board | substrate 21 can be electrically connected.

The connection member 40 is formed by insert molding using, for example, a conductive material that constitutes the electrode 42 and a resin material that constitutes the main body 41. The main body 41 is molded using a resin material such as PBT or ABS, for example. The electrode 42 is formed using a conductive material such as copper.

[Reflection member]
The reflecting member 50 is a member that controls light distribution from the light source 20. In the present embodiment, the reflecting member 50 reflects the light from the light source 20 toward the optical member 60. As shown in FIG. 2, the reflecting member 50 is a substantially cylindrical body provided with an opening through which the optical axis J passes substantially through the center.

Specifically, the reflecting member 50 has an end on the side (negative side in the Z-axis direction) from which light from the light source 20 is incident (positive side in the Z-axis direction). The inner diameter is gradually increased toward the portion. The inner surface of the reflecting member 50 is a reflecting surface that reflects light from the light source 20.

The reflecting member 50 is formed using a hard white resin material such as PBT, for example. At this time, a metal reflecting film such as aluminum may be provided on the inner surface of the reflecting member 50.

[Optical member]
The optical member 60 is a translucent member into which light from the reflecting member 50 is incident. As shown in FIG. 2, the optical member 60 is disposed so as to cover the opening on the light emitting side (the negative side in the Z-axis direction) of the reflecting member 50. The optical member 60 may have a function of controlling and emitting the light distribution of the light that has passed through the reflecting member 50. In the present embodiment, the optical member 60 is a Fresnel lens.

The optical member 60 is formed from a material having translucency. For example, the optical member 60 is formed from a transparent resin material such as acrylic (PMMA) or polycarbonate (PC). Alternatively, the optical member 60 may be formed from a transparent glass material.

The optical member 60 may have a light diffusion (scattering) structure. For example, the optical member 60 may be formed using a resin material in which a diffusing material is dispersed, or an unevenness or a dot pattern may be formed on the surface.

[Frame]
The frame body 70 is a cylindrical member that allows the light emitted from the optical member 60 to pass therethrough. In the present embodiment, as shown in FIG. 2, the frame body 70 includes an auxiliary reflection member 71, a frame main body 72, and a collar 73.

The auxiliary reflecting member 71 is a cylindrical member arranged inside the cylindrical frame main body 72. The auxiliary reflection member 71 has an auxiliary reflection surface on the inner side, and has a function of controlling the light distribution of the lighting fixture 1. In the present embodiment, the auxiliary reflecting member 71 is formed of a thin metal plate such as aluminum.

The frame main body 72 is a main body of the cylindrical frame 70. The frame body 72 has substantially the same outer diameter as the base 11 of the heat sink 10. The frame main body 72 and the base 11 are fixed by screws (not shown). The frame main body 72 is formed using a metal material such as aluminum, for example.

鍔 73 is a part of the frame body 72, and is a part extending from the end of the frame body 72 on the light emitting side (the negative side in the Z-axis direction) toward the outside in the radial direction. The collar 73 is provided in an annular shape. For example, when the lighting fixture 1 is attached to the ceiling, the flange 73 contacts the lower surface of the ceiling plate.

[Mounting spring]
The attachment spring 80 is used for attaching the lighting fixture 1 to an attachment hole such as a ceiling. Specifically, the lighting fixture 1 can be attached by holding the ceiling plate between the attachment spring 80 and the flange 73 of the frame body 72 using the restoring force of the attachment spring 80.

The mounting spring 80 is formed into a long and narrow plate shape by pressing or the like using a metal material such as iron. In the present embodiment, as illustrated in FIG. 1, the lighting fixture 1 includes two attachment springs 80, but the number and positions of the attachment springs 80 are not limited thereto.

[Detailed configuration of heat sink]
Below, the detailed structure of the heat sink 10 is demonstrated.

4 and 5 are a perspective view and a top view of the heat sink 10 according to the present embodiment, respectively.

In the present embodiment, the heat sink 10 is not formed integrally (as an integrally molded product) such as aluminum die casting, but is formed by connecting a plurality of components. Specifically, the protrusions 114 provided on the base 11 are plastically deformed, so that the base 11 and the fins 12 which are separate parts are connected and fixed. More specifically, as shown in FIG. 2, the fin 12 is fixed to the base 11 in a state where the protrusion 114 is inserted into the through hole 123 provided in the fin 12 and the protrusion 114 is plastically deformed. Has been.

In the present embodiment, as shown in FIGS. 4 and 5, the heat sink 10 includes a plurality of sub fins 13. The base 11 and the plurality of sub fins 13 are integrally formed products. For example, the base 11 and the plurality of sub fins 13 are integrally formed (as one component) by forging a cylindrical member (slag) made of aluminum. Each of the plurality of fins 12 is formed integrally (as one component) by, for example, pressing or bending an aluminum sheet metal. The plate thickness of the sheet metal (that is, the plate thickness of the fins 12) is, for example, 1 mm, but is not limited thereto.

In this embodiment, the dimensional accuracy can be increased by forming each member such as the base 11 and the plurality of fins 12 by forging, pressing or bending. Moreover, since the thickness of each member can be made thin, the weight reduction of the heat sink 10 is realizable. The base 11 and the plurality of sub fins 13 may be made of aluminum die casting. Similarly, each of the plurality of fins 12 may be made of aluminum die casting.

[base]
FIG. 6 is a bottom view of the base 11 according to the present embodiment. FIG. 7 is a cross-sectional view of the base 11 according to the embodiment taken along line VII-VII in FIG.

The base 11 is a bottomed cylindrical base (base) as shown in FIGS. Thereby, the thickness of the bottom part 110 can be made thin, ensuring the envelope volume of the base 11. Therefore, the heat from the light source 20 can be efficiently conducted to the plurality of fins 12 and the plurality of sub fins 13. As shown in FIG. 2 and the like, the base 11 has a bottom portion 110 and a side wall portion 111.

The bottom portion 110 is a disc-shaped portion having an inner bottom surface 110a to which the light source 20 is attached and an outer bottom surface 110b on which the plurality of fins 12 are disposed. As shown in FIG. 2, the inner bottom surface 110 a and the outer bottom surface 110 b are substantially orthogonal to the optical axis J and face each other.

The inner bottom surface 110a is the bottom surface inside the bottomed cylindrical base 11, and has a substantially circular shape in plan view. The outer bottom surface 110b is an outer bottom surface of the bottomed cylindrical base 11 and has a substantially circular shape in plan view. In the present embodiment, as shown in FIG. 7, the outer bottom surface 110b is a flat surface. Specifically, the outer bottom surface 110b is not provided with a recess.

The side wall portion 111 is a portion erected from the periphery of the bottom portion 110. The side wall 111 has a flat and substantially cylindrical shape with the optical axis J as the central axis.

The thickness of the bottom part 110 and the side wall part 111 is, for example, 1 mm to 10 mm. The diameter of the outer bottom surface 110b of the bottom part 110 is, for example, 70 mm to 90 mm. The height of the side wall 111 is, for example, 15 mm to 18 mm. These dimensions are merely examples and are not limited to these.

In the present embodiment, the inner bottom surface 110a is provided with a mounted portion 112 and a groove 113 as shown in FIG. 2, FIG. 3, FIG. 6, and FIG.

The attached portion 112 is a part of the inner bottom surface 110a and is a portion to which the light source 20 is attached. The mounted portion 112 is a flat surface having a substantially rectangular shape in plan view, and the substrate 21 of the light source 20 is placed thereon. The to-be-attached part 112 and the board | substrate 21 are in surface contact, as shown in FIG.

The groove 113 is provided along the outer periphery of the attached portion 112. In the present embodiment, as shown in FIG. 3 and FIG. 6, the groove 113 is provided over the entire outer periphery of the attached portion 112. The groove 113 is provided to avoid interference between the attachment member 30 and the connection member 40 and the inner bottom surface 110a.

As shown in FIGS. 6 and 7, the groove 113 has a first side wall 113a and a second side wall 113b. The first side wall 113a is a side wall close to the mounted portion 112, and the second side wall 113b is a side wall farther from the mounted portion 112 than the first side wall 113a. That is, when the inner bottom surface 110a is viewed in plan (bottom view), the first side wall 113a is an inner peripheral side wall, and the second side wall 113b is an outer peripheral side wall.

As shown in FIG. 7, the first side wall 113a is perpendicular to the inner bottom surface 110a. The second side wall 113b is inclined with respect to the inner bottom surface 110a. Specifically, the second side wall 113b is inclined so as to approach the first side wall 113a toward the positive side in the Z-axis direction. That is, the opening width of the groove 113 is larger than the bottom surface width of the groove 113. Note that the opening width and the bottom surface width are the distance between the negative side ends in the Z-axis direction and the positive side end in the Z-axis direction among the distances between the first side wall 113a and the second side wall 113b, respectively. It is the distance between parts.

In the present embodiment, as shown in FIGS. 4 and 5, the outer bottom surface 110 b is provided with a plurality of protrusions 114.

The plurality of protrusions 114 protrude from the outer bottom surface 110b of the bottom 110. As shown in FIG. 2, each of the plurality of protrusions 114 is inserted into the through hole 123 of the fin 12 and is in a state of plastic deformation. Specifically, each of the plurality of protrusions 114 is a substantially cylindrical portion that protrudes from the outer bottom surface 110b to the positive side in the Z-axis direction, and is formed by plastic deformation of the tip.

In the present embodiment, as shown in FIG. 5, the plurality of protrusions 114 are arranged radially in plan view. Specifically, two protrusions 114 are arranged on each of a plurality of straight lines extending radially from the optical axis J. One fin 12 is fixed to two projections 114 arranged on a straight line extending from the optical axis J.

The plurality of protrusions 114 have the same shape and the same size as each other, but are not limited thereto. The height of the protrusion 114 is, for example, 3 mm to 5 mm. The diameter of the protrusion 114 is, for example, 3 mm to 5 mm. These dimensions are merely examples and are not limited to these.

In addition, in FIG.4 and FIG.5, the several protrusion part 114 before plastic deformation is shown. Details of the method of plastic deformation of the protrusion 114 and the shape after the plastic deformation will be described later with reference to FIGS.

[fin]
The fin 12 is a heat radiating fin for radiating heat from the light source 20. In the present embodiment, the plurality of fins 12 are configured separately from the base 11. The plurality of fins 12 are fixed to the base 11. Specifically, each of the plurality of fins 12 is caulked and fixed to the base 11 by plastic deformation of the protrusions 114 of the base 11.

The plurality of fins 12 are arranged radially on the outer bottom surface 110b of the bottom portion 110 of the base 11, as shown in FIGS. Each of the plurality of fins 12 is long along the radial direction of the outer bottom surface 110b and is arranged at equal intervals. Specifically, the eight fins 12 are arranged at an equal angle (specifically, 45 °) around the optical axis J.

In the present embodiment, the plurality of fins 12 have the same shape and the same size. Specifically, the cross-sectional shape of each of the plurality of fins 12 is U-shaped. As shown in FIGS. 8 and 9, each of the plurality of fins 12 includes a bottom plate 120, and a pair of first side plate 121 and second side plate 122 erected on the bottom plate 120. 8 and 9 are a perspective view and a top view of the fin 12 according to the present embodiment, respectively. The fins 12 shown in FIG. 8 and FIG. 9 are fins 12 that are located diagonally to the left of the optical axis J among the eight fins 12 shown in FIG.

The bottom plate 120 is provided with a through-hole 123 as shown in FIG. The bottom plate 120 is a long flat plate portion. The longitudinal direction of the bottom plate 120 substantially coincides with the radial direction of the outer bottom surface 110b.

The first side plate 121 and the second side plate 122 are a pair of side plates, and are arranged substantially parallel to each other. Specifically, each of the first side surface plate 121 and the second side surface plate 122 is a flat plate portion erected substantially vertically from an end portion of the bottom plate 120 in the short direction (X-axis direction). The first side plate 121 and the second side plate 122 have substantially the same shape and the same size as each other, but are not limited thereto.

The protrusion 114 of the base 11 is inserted into the through hole 123 provided in the bottom plate 120. The protrusion 114 is in plastic contact with the inner surface of the through hole 123. As a result, the base 11 and the bottom plate 120 are thermally connected via the protrusion 114.

The bottom plate 120 has a protrusion 124 as shown in FIGS. The protrusion 124 protrudes outward of the outer bottom surface 110b when the outer bottom surface 110b is viewed in plan. As shown in FIGS. 4 and 5, the distal end of the protruding portion 124 is located on the outer peripheral edge 110 c of the outer bottom surface 110 b. Since the surface area of the bottom plate 120 can be increased by providing the protrusions 124, the heat dissipation performance of the fins 12 can be improved.

In the present embodiment, as shown in FIG. 9, the bottom plate 120 further has a protrusion 125. The protrusion 125 protrudes toward the inside of the outer bottom surface 110b when the outer bottom surface 110b is viewed in plan. Specifically, the protruding portion 125 protrudes toward the optical axis J. Thereby, since the surface area of the bottom plate 120 can be further increased, the heat dissipation performance of the fins 12 can be further enhanced.

As shown in FIGS. 8 and 9, each of the plurality of fins 12 further includes a first projecting portion 126 and a second projecting portion 127. In the present embodiment, as shown in FIG. 5, the first projecting portion 126 is on the center side (that is, the optical axis J side), and the second projecting portion 127 is on the outer side (that is, the outer peripheral edge 110c side of the outer bottom surface 110b). The plurality of fins 12 are fixed on the outer bottom surface 110b.

As shown in FIGS. 8 and 9, the fin 12 has a point-symmetric shape when viewed from above. That is, when the fin 12 is fixed to the base 11, either the first projecting portion 126 or the second projecting portion 127 may be near the optical axis J. That is, since there is no restriction | limiting in the direction of attachment of the fin 12, the arrangement | positioning process of the fin 12 with respect to the base 11 can be performed easily.

The first projecting portion 126 is a portion extending from the first side plate 121 toward the second side plate 122. Specifically, the first projecting portion 126 is substantially formed on each of the first side plate 121 and the second side plate 122 from one longitudinal end of the first side plate 121 toward the second side plate 122. It extends so as to be orthogonal.

In the present embodiment, as shown in FIG. 10, the width W in the Z-axis direction of the first projecting portion 126 is shorter than the height H of the first side plate 121. For example, W is H / 2 or less. In other words, the first projecting portion 126 does not cover the entire end portion of the fin 12 in the longitudinal direction (between the first side surface plate 121 and the second side surface plate 122), and air flows through the end portion. Is provided. FIG. 10 is a cross-sectional view of the heat sink 10 according to the present embodiment taken along the line XX of FIG.

Specifically, the first struts 126 are provided only on the upper end side of the first side plate 121 (the side opposite to the bottom plate 120). That is, as shown in FIGS. 4 and 8, a gap 128 is provided between the first projecting portion 126 and the protruding portion 125 provided at the end of the bottom plate 120 in the longitudinal direction. Thereby, retention of air between the first side plate 121 and the second side plate 122 can be suppressed.

Note that the upper end side of the first side plate 121 is a portion where other objects (such as a finger of the builder of the lighting fixture 1 or a ceiling plate) are likely to come into contact, and a portion to which external force is easily applied. Accordingly, since the first projecting portion 126 is provided on the upper end side of the first side plate 121, the first side plate 121 bends toward the second side plate 122 when an external force is applied. Can be suppressed.

The root of the first strut 126 has a round shape. Specifically, the connection portion 126a between the first projecting portion 126 and the first side plate 121 has a smooth curved surface.

As a result, as shown in FIG. 5, the connection between the end portion of the second side plate 122 of one fin 12 near the optical axis J and the first side plate 121 of another fin 12 adjacent to the one fin 12 is performed. A gap 130 is provided between the portion 126a. The gap 130 becomes larger than when the connecting portion 126a is not a smooth curved surface. For this reason, it becomes easy for air to flow outward from the vicinity of the optical axis J, and it can suppress that air accumulates in the vicinity of the optical axis J.

The second projecting portion 127 is a portion extending from the second side plate 122 toward the first side plate 121. Specifically, the second projecting portion 127 is substantially formed on each of the second side plate 122 and the first side plate 121 from one end portion in the longitudinal direction of the second side plate 122 toward the first side plate 121. It extends so as to be orthogonal.

In the present embodiment, the second projecting portion 127 has substantially the same shape and the same size as the first projecting portion 126. As shown in FIGS. 8 and 9, the second tension portion 127 is disposed to face the first tension portion 126. Specifically, the second projecting portion 127 is provided only on the upper end side of the second side plate 122. That is, as shown in FIGS. 4, 8, and 10, a gap 129 is provided between the second projecting portion 127 and the protruding portion 124 provided at the end of the bottom plate 120 in the longitudinal direction.

The gap 128 and the gap 129 are opposed to each other along the longitudinal direction of the fin 12. For this reason, air becomes easy to flow along the longitudinal direction of the fin 12, and retention of air in the fin 12 can be suppressed.

The root of the second projecting portion 127 has a round shape. Specifically, the connecting portion 127a between the second projecting portion 127 and the second side plate 122 has a smooth curved surface. Thereby, even when the fins 12 are arranged so that the second projecting portion 127 is on the center side and the first projecting portion 126 is on the outer side, the gap 130 can be formed. Therefore, the retention of air can be suppressed.

[Subfin]
The sub fin 13 is a heat dissipating sub fin for dissipating heat from the light source 20. The sub fin 13 is an auxiliary fin for further enhancing the heat dissipation effect of the heat sink 10, and is a smaller heat dissipation portion than the fin 12.

The sub fin 13 is arrange | positioned on the outer bottom face 110b between the two adjacent fins 12 among the several fins 12, as shown in FIG.4 and FIG.5. In the present embodiment, the sub fins 13 are arranged between two adjacent fins 12. Specifically, since the fins 12 are arranged in a ring shape, the number of fins 12 and the number of sub fins 13 are the same. Two or more sub fins 13 may be arranged between the two fins 12. In addition, the number of sub-fins 13 disposed between two adjacent fins 12 may be different between the fins 12.

As shown in FIG. 5, when the outer bottom surface 110b is viewed in plan, the outer shape of the sub fin 13 is an ellipse or an ellipse (oval). For example, the planar view shape of the sub fin 13 is a rounded rectangle.

At this time, the sub fins 13 are arranged such that the longitudinal direction thereof follows the radial direction of the plurality of fins 12. Specifically, the longitudinal direction of the sub fin 13 passes through the center of radiation of the fin 12, that is, the optical axis J.

As shown in FIG. 10, the height h from the outer bottom surface 110 b of the sub fin 13 is lower than the height H from the outer bottom surface 110 b of the fin 12. In the present embodiment, the height h of the sub fin 13 is less than or equal to one half of the height H of the fin 12. Specifically, the height h of the sub fin 13 is equal to or less than a quarter of the height H of the fin 12. For example, the height of the sub fin 13 is 2 mm to 5 mm. Further, the width (length in the short direction) of the sub fin 13 is, for example, 2 mm to 6 mm.

In the present embodiment, the sub-fins 13 are arranged at equidistant positions from the two adjacent fins 12 when the outer bottom surface 110b is viewed in plan. Specifically, the longitudinal direction of the sub fin 13 is a bisector of an angle (an angle centered on the optical axis J) formed by the radial direction (longitudinal direction) of two adjacent fins 12.

Further, the sub fins 13 are arranged along the outer peripheral edge 110c of the outer bottom surface 110b when the outer bottom surface 110b is viewed in plan. Specifically, the sub fin 13 is provided in a region on the outer peripheral edge 110c side from a center line (circle of radius r / 2, r is a diameter of the outer bottom surface 110b) between the optical axis J and the outer peripheral edge 110c. .

In the present embodiment, as shown in FIGS. 4 and 5, two screw holes 116 into which screws for fixing the frame body 70 are inserted are formed in the bottom portion 110 of the base 11. Each of the two screw holes 116 passes through the bottom 110 of the base 11. For this reason, for example, two of the eight sub-fins 13 (sub-fins 13 in the lower right direction and the upper left direction from the optical axis J in FIG. 5) are externally arranged to avoid interference with the screw holes 116. It is provided apart from the peripheral edge 110c. For example, the two sub fins 13 are provided at positions close to the center line (circle of radius r / 2).

Further, a tap 117 into which a screw 91 for fixing the connection member 40 is screwed is provided on the bottom 110 of the base 11. The tap 117 is a convex portion protruding from the outer bottom surface 110b of the bottom portion 110, and has a cavity for receiving a screw 91 therein. The tap 117 is not mainly intended to improve the heat dissipation performance, and the position of the tap 117 depends on the position of the connection member 40 and the like. Therefore, for example, as shown in FIG. 5, the tap 117 is disposed close to the fin 12. Unlike the tap 117, the sub fin 13 according to the present embodiment is mainly intended to improve the heat dissipation performance.

[Projection shape and gap]
Next, the shape of the protrusion 114 after plastic deformation and the connection between the base 11 and the fin 12 will be described. FIG. 11 is an enlarged cross-sectional view of a main part showing a region XI in FIG. 10 in an enlarged manner.

As shown in FIG. 9, the protrusion 114 is provided with a fillet 114a at the root. The fillet part 114 a is a thick part provided to increase the strength of the protrusion 114. The fillet portion 114 a is provided in an annular shape along the outer periphery of the protruding portion 114. The fillet portion 114a is, for example, a round having a radius of 1 mm to 2 mm.

The protrusion 114 is provided with an enlarged diameter portion 114b at the tip. The enlarged diameter portion 114b is a portion formed by plastic deformation of the tip end portion of the projection portion 114, and is a portion extending in the radial direction of the projection portion 114 in a top view.

As shown in FIG. 9, the fin 12 is fixed to the base 11 by sandwiching the bottom plate 120 between the fillet portion 114a and the enlarged diameter portion 114b. In the present embodiment, a gap 140 is provided between the bottom plate 120 of the fin 12 and the outer bottom surface 110 b of the base 11. The bottom plate 120 and the outer bottom surface 110b are parallel. That is, the gap 140 is a flat gap having a substantially constant width d. The gap 140 is formed by fixing the fins 12 and the base 11 with the bottom plate 120 placed on the fillet portion 114a. The width d of the gap 140 is, for example, 0.2 mm to 0.3 mm, but is not limited thereto.

The fin 12 is thermally coupled to the base 11 through the protrusion 114. For example, the side surface of the protruding portion 114 and the inner wall of the through hole of the bottom plate 120 are in surface contact, the lower surface of the enlarged diameter portion 114b of the protruding portion 114 and a part of the upper surface of the bottom plate 120 are in surface contact, and the fillet portion 114a and the bottom plate A part of the lower surface of 120 is in surface contact or point contact. Through these contact portions, heat from the light source 20 is transmitted to the fins 12 from the protrusions 114. The heat transferred to the fins 12 is mainly dissipated into the air from the bottom plate 120, the first side plate 121, the second side plate 122, and the like.

In the present embodiment, since the gap 140 is provided, it is possible to suppress the retention of air between the bottom plate 120 and the outer bottom surface 110b. That is, since heat generation between the bottom plate 120 and the outer bottom surface 110b can be suppressed, the heat dissipation performance can be further enhanced.

[Production method]
Then, the manufacturing method of the heat sink 10 is demonstrated.

FIG. 12 is a perspective view showing a positioning step of the fin 12 with the base 11 in the method of manufacturing the heat sink 10 according to the present embodiment. FIG. 12 shows a state immediately before the four fins 12 are arranged at positions to be fixed and the protrusions 114 are inserted into the through holes 123 of the fifth and sixth fins 12. In addition, although the example which arrange | positions the fin 12 one by one is shown here, you may arrange | position the eight fins 12 collectively.

As indicated by the one-dot chain line arrow in FIG. 12, at the position where the two protrusions 114 before plastic deformation aligned in the radial direction of the base 11 and the two through holes 123 of the fin 12 overlap in the top view, 12 is moved downward. As a result, the two protrusions 114 are inserted into the two through holes 123. Since the size of the two through holes 123 and the size of the protrusion 114 are substantially the same, the movement of the fins 12 in the lateral direction is restricted.

After all the fins 12 are arranged, the protrusion 114 is plastically deformed. Thereby, the fin 12 and the base 11 are fixed.

FIG. 13 is a cross-sectional view showing a plastic deformation step (caulking step) of the protrusion 114 in the method for manufacturing the heat sink 10 according to the present embodiment. As shown in FIG. 13A, the punch 150 is pressed from the tip end direction of the protrusion 114. By pushing the punch 150 as it is, as shown in FIG. 13B, the protrusion 114 is plastically deformed to form the enlarged diameter portion 114b. At this time, not only the projection 114 but also the periphery of the through hole 123 of the bottom plate 120 of the fin 12 may be plastically deformed.

Thus, the fins 12 are joined and fixed to the base 11 by caulking. Specifically, the enlarged diameter portion 114 b formed by plastic deformation presses the bottom plate 120 of the fin 12 toward the outer bottom surface 110 b of the base 11. Thereby, detachment | desorption of the fin 12 can be suppressed.

As can be seen by comparing FIGS. 13A and 13B, a gap is formed between the protrusion 114 before plastic deformation and the through-hole 123 of the fin 12, whereas the plasticity No gap is formed between the deformed protrusion 114 and the through hole 123. This is because when the protrusion 114 is pressed by the punch 150, the protrusion 114 spreads in the lateral direction.

Therefore, in the present embodiment, the side surface of the protrusion 114 comes into contact with the inner wall surface of the through hole 123 of the bottom plate 120. Further, the lower surface of the enlarged diameter portion 114 b is in contact with the upper surface of the bottom plate 120. Thereby, the heat conduction from the base 11 to the fin 12 can be performed efficiently.

For example, since the contact area is larger than when the fins 12 are screwed to the base 11, the thermal conductivity can be increased. In addition, the fin 12 and the base 11 can be easily joined as compared with the case of screwing, and is excellent in mass production.

Here, in the present embodiment, the enlarged diameter portion 114b is close to the first side plate 121 and the second side plate 122. Specifically, the gap between the enlarged diameter portion 114b and one of the first side plate 121 and the second side plate 122 is, for example, 0.5 mm or less. The enlarged diameter portion 114 b may be in contact with at least one of the first side plate 121 and the second side plate 122. When the enlarged diameter portion 114b is in contact with at least one of the first side plate 121 and the second side plate 122, the contact area between the fins 12 and the base 11 is increased, so that the thermal conductivity is further increased. .

Thus, the enlarged diameter portion 114 b is not formed so as to be recessed with respect to the first side plate 121 and the second side plate 122. That is, the enlarged diameter portion 114b formed by plastic deformation is formed so as not to deform the first side plate 121 and the second side plate 122. Thereby, it can suppress that the heat dissipation performance of the fin 12 is impaired.

In the present embodiment, the example in which the plurality of fins 12 are fixed to the base 11 at the same time has been described. However, the present invention is not limited to this. The protrusion 114 may be plastically deformed and fixed for each fin 12.

[Effects, etc.]
As described above, the heat sink 10 according to the present embodiment includes the bottomed cylindrical base 11, the plurality of fins 12 arranged radially on the outer bottom surface 110 b of the bottom portion 110 of the base 11, and the plurality of fins 12. The sub-fin 13 is disposed on the outer bottom surface 110b between two adjacent fins 12, and the height of the sub-fin 13 from the outer bottom surface 110b is lower than the height of the fin 12 from the outer bottom surface 110b. In addition, for example, the lighting fixture 1 according to the present embodiment includes the heat sink 10 and the light source 20 attached to the inner bottom surface 110 a of the bottom portion 110.

Thereby, since the heat sink 10 includes not only the plurality of fins 12 but also the sub fins 13, the surface area of the heat sink 10 increases, so that the heat dissipation performance can be improved. Moreover, since the height of the sub fin 13 is lower than the height of the fin 12, it is possible to make it difficult to inhibit the air flow between the two adjacent fins 12. Thereby, it can suppress that the fin 12 and the subfin 13 are crowded too much, and heat is accumulated and heat dissipation performance falls. Thus, in this Embodiment, the heat sink 10 which has high heat dissipation performance, and the lighting fixture 1 provided with this heat sink 10 can be provided.

Also, for example, the base 11 and the sub fin 13 are integrally molded products.

Thereby, the number of parts constituting the heat sink 10 can be reduced. Therefore, weight reduction of the heat sink 10 and cost reduction by simplification of the assembly process can be realized.

Further, for example, when the outer bottom surface 110 b is viewed in plan, the outer shape of the sub fin 13 is an ellipse or an ellipse, and the sub fin 13 is arranged such that the longitudinal direction thereof is along the radial direction of the plurality of fins 12. .

This makes it difficult to inhibit the flow of air between the fins 12 along the radial direction, so that deterioration in heat dissipation performance can be suppressed. Further, when the base 11 and the sub fin 13 are integrally formed by forging, the longitudinal direction of the sub fin 13 is the same as the flow direction of the material during forging, so that the processing load can be reduced. Therefore, since the lifetime of the mold can be extended, the cost of the heat sink 10 and the lighting fixture 1 can be reduced.

Further, for example, the sub fins 13 are arranged between two adjacent fins 12.

Thereby, since the heat sink 10 includes the plurality of sub fins 13, the surface area of the heat sink 10 is further increased, so that the heat dissipation performance can be improved. Further, the heat dissipation performance of the heat sink 10 can be made uniform in the plane.

Further, for example, the sub fin 13 is arranged at an equal distance from the two adjacent fins 12 when the outer bottom surface 110b is viewed in plan.

This makes it difficult for the air flow between adjacent fins 12 to be hindered, so that a reduction in heat dissipation performance can be suppressed.

Further, for example, the sub fin 13 is disposed along the outer peripheral edge 110c of the outer bottom surface 110b when the outer bottom surface 110b is viewed in plan.

Thus, the sub fins 13 are provided along the outer peripheral edge instead of the central portion of the outer bottom surface 110b where the plurality of fins 12 are densely packed. Therefore, since it becomes difficult to inhibit the air flow between the adjacent fins 12, it is possible to suppress a decrease in heat dissipation performance.

Further, for example, the plurality of fins 12 are configured separately from the base 11.

Thereby, the dimensional accuracy of each can be improved by manufacturing the fin 12 and the base 11 separately. Therefore, the fin 12 and the base 11 can be effectively brought into contact with each other, and the thermal conductivity can be improved. Moreover, since air can flow smoothly between the plurality of fins 12 and the like, the heat dissipation performance can be further enhanced.

Moreover, since the number of fins 12 fixed to the base 11 can be changed in design according to the output of the light source 20, the heat dissipation performance of the heat sink 10 can be changed as appropriate. Thereby, for example, the heat sink 10 having a different number of fins 12 and different heat dissipation performance (that is, a different number of fins 12) can be manufactured using parts having the same shape. Therefore, for example, since the fins 12 and the base 11 can be manufactured in large quantities, cost reduction can be realized.

Incidentally, in the heat sink 10 according to the present embodiment, the light source 20 is attached to the inner bottom surface 110a of the base 11, and the connection member 40 and the like for fixing the light source 20 are fixed to the inner bottom surface 110a. In order to prevent interference of the connecting member 40 and the like, a groove 113 is provided in the inner bottom surface 110a. The groove 113 also functions to ensure an insulation distance between the LED 22 mounted on the substrate 21 of the light source 20 and the base 11.

The base 11 is formed, for example, by forging using a mold. For this reason, in order to form the groove 113, a mold having a convex portion that matches the groove 113 is required. In order to ensure the strength of the convex portion of the mold, it is conceivable to increase the base of the convex portion. However, in this case, there is a problem that the insulation distance from the LED 22 to the inner bottom surface 110a is shortened.

On the other hand, in the heat sink 10 according to the present embodiment, for example, the inner bottom surface 110a of the bottom portion 110 is provided with a groove 113 along the outer periphery of the attached portion 112 to which the light source 20 is attached. The first side wall 113a is close to the mounted portion 112, and the second side wall 113b is farther from the mounted portion 112 than the first side wall 113a. The first side wall 113a is perpendicular to the inner bottom surface 110a. The two side walls 113b are inclined with respect to the inner bottom surface 110a.

14 and 15 are cross-sectional views for explaining the insulation distance from the LED 22 to the inner bottom surface 110a according to the comparative example and the embodiment, respectively. 14A and 15A show the base 11x and the

molds

190x and 190 used when the base 11 is manufactured, respectively. The

molds

190x and 190 have

convex portions

191x and 191 having shapes matching the

grooves

113x and 113, respectively. 14 (b) and 15 (b) correspond to an enlarged cross section near the groove 113 shown in FIG.

FIG. 14 shows a groove 113x formed by using a mold 190x having a thick base at the convex portion 191x in order to increase the strength of the mold. In the groove 113x, both the first side wall 113ax and the second side wall 113b are inclined with respect to the inner bottom surface 110a.

The insulation distance from the LED 22 to the inner bottom surface 110a is the shortest distance along the surface of the insulator or in the atmosphere. In FIGS. 14 and 15, the insulation distances L1 and L2 are indicated by thick lines, respectively.

As shown in FIG. 14, the insulation distance L1 according to the comparative example is the sum of the distance from the LED 22 along the upper surface and the end surface of the substrate 21 and the length of the perpendicular line from the lower right end of the substrate 21 to the first side wall 113ax. become. On the other hand, as shown in FIG. 15, the insulation distance L <b> 2 according to the present embodiment is a distance along the upper surface, end surface, and lower surface of the substrate 21 from the LED 22.

Thus, in the comparative example, since the first side wall 113ax is inclined, the first side wall 113ax approaches the lower right end portion of the substrate 21. For this reason, the insulation distance L1 becomes shorter than the insulation distance L2. In other words, in this embodiment, the insulation distance L2 can be secured longer than the insulation distance L1.

Further, in the present embodiment, since the second side wall 113b is inclined, the root of the convex portion of the mold can be increased as in the comparative example. Specifically, the root of the convex portion 191 of the mold 190 can be made larger than when both the first side wall 113a and the second side wall 113b are perpendicular to the inner bottom surface 110a.

As described above, according to the heat sink 10 according to the present embodiment, it is possible to increase the mold strength while ensuring the insulation distance.

Further, in the heat sink 10 according to the present embodiment, the fins 12 and the base 11 are configured separately. For example, the fin 12 is caulked to the base 11 and fixed. Specifically, the protruding portion 114 protruding from the outer bottom surface 110 b of the base 11 is inserted into the through hole 123 provided in the bottom plate 120 of the fin 12 to plastically deform the protruding portion 114. At this time, it is difficult to make sure that the bottom plate 120 and the outer bottom surface 110b are in surface contact due to the influence of manufacturing errors and the like. That is, a minute space may be formed between the bottom plate 120 and the outer bottom surface 110b. The minute space is unlikely (or not) to flow air between the external space and can become a heat pool. Therefore, the heat dissipation performance of the heat sink 10 may be deteriorated.

On the other hand, in the heat sink 10 according to the present embodiment, for example, at least one of the plurality of fins 12 includes the bottom plate 120 provided with the through holes 123 and the first side plate 121 erected on the bottom plate 120. The base 11 has a protrusion 114 inserted into the through-hole 123. The base 11 and the bottom plate 120 are thermally connected via the protrusion 114, and the bottom plate 120 and the outer bottom surface 110b are connected to each other. A gap 140 is provided between them.

Thereby, it is possible to suppress the formation of a heat pool between the bottom plate 120 and the outer bottom surface 110b by providing the gap 140. Therefore, the heat dissipation performance of the heat sink 10 can be enhanced.

In the heat sink 10 according to the present embodiment, for example, the fins 12 are manufactured by bending a sheet metal having a thickness of 1 mm. That is, the plate thickness of the fin 12 can be reduced. Since the plate thickness of the fin 12 is reduced, there is a risk that the fin 12 is easily deformed when an external force is applied.

On the other hand, in the heat sink 10 according to the present embodiment, for example, at least one of the plurality of fins 12 includes a bottom plate 120, a pair of first side plates 121 and second side plates provided upright on the bottom plate 120. 122 and a first protruding portion 126 extending from the first side plate 121 toward the second side plate 122.

Thereby, even when a force is applied to the first side plate 121 or the second side plate 122 of the fin 12, the first side plate 121 and the second side plate are supported by the first projecting portion 126 projecting to the second side plate 122. The deformation of the face plate 122 can be suppressed. In this way, the strength of the fin 12 can be increased. In addition, since a space between the first side plate 121 and the second side plate 122 can be secured by the first protruding portion 126, air flows between the first side plate 121 and the second side plate 122. be able to. Therefore, the heat dissipation performance of the heat sink 10 can be enhanced.

In addition, for example, at least one of the plurality of fins 12 further includes a second projecting portion 127 extending from the second side plate 122 toward the first side plate 121.

Thereby, the strength of the fin 12 can be further increased.

Also, for example, the root of the first strut 126 has a round shape.

Thereby, for example, when some of the plurality of fins 12 are densely packed, a gap between two adjacent fins 12 can be secured. Specifically, as shown in FIG. 5 and the like, when the plurality of fins 12 are arranged radially around the optical axis J, the end of each of the plurality of fins 12 on the optical axis J side It is dense so as to surround the axis J. Since the connecting portion 126a has a round shape, the gap 130 can be enlarged, so that air can flow smoothly from the central portion of the heat sink 10 toward the outside. Therefore, the heat dissipation performance of the heat sink 10 can be enhanced.

Further, for example, when the outer bottom surface 110b is viewed in plan, the bottom plate 120 has a protrusion 124 that protrudes outward from the outer bottom surface 110b, and the tip of the protrusion 124 has an outer peripheral edge 110c of the outer bottom surface 110b. Is located.

Thereby, since the surface area of the fin 12 can be increased, the heat dissipation performance of the heat sink 10 can be enhanced. Further, since the protruding portion 124 is positioned so as not to protrude outward from the outer peripheral edge 110 c, other objects are not easily caught by the protruding portion 124. For this reason, for example, since the finger of the builder of the lighting fixture 1 is not likely to accidentally hit the protruding portion 124, the safety of handling during construction can be improved. In addition, for example, since the wiring for supplying power to the light source 20 is not easily caught by the protruding portion 124, the wiring can be prevented from being damaged, and the reliability of the lighting fixture 1 can be improved.

For example, the plan view shape of the outer bottom surface 110b is circular, and each of the plurality of fins 12 is long along the radial direction of the outer bottom surface 110b and is arranged at equal intervals.

Thereby, for example, the arrangement of the plurality of fins 12 can be made symmetrical, and the heat radiation performance can be made uniform in the plane.

(Other)
As mentioned above, although the heat sink and lighting fixture concerning this invention were demonstrated based on embodiment, this invention is not limited to said embodiment.

For example, in the above-described embodiment, an example in which the base 11 and the plurality of fins 12 of the heat sink 10 are configured as separate bodies (separate members) has been described, but the base 11 and the plurality of fins 12 are integrally formed. It may be. That is, the entire heat sink 10 may be an integrally molded product, for example, an aluminum die cast.

Further, for example, in the above-described embodiment, an example in which the base 11 and the plurality of sub fins 13 are integrally formed has been shown, but the base 11 and the plurality of sub fins 13 are configured as separate bodies (separate members). May be. For example, the sub fin 13 may have a structure equivalent to the fin 12 and may be caulked and fixed to the base 11.

Further, for example, in the above-described embodiment, an example in which the base 11 and the plurality of fins 12 are caulked and fixed is shown, but the fixing method of the base 11 and the fins 12 is not limited thereto. For example, the fin 12 may be press-fitted into the base 11 and may be fixed using a fixing member such as a screw. The same may be applied to the case where the sub fin 13 is a separate body from the base 11.

For example, in the above-described embodiment, the example in which the shape of the fin 12 as viewed from above is point-symmetric is shown, but the present invention is not limited to this. For example, the fin 12 may include only one of the first tension part 126 and the second tension part 127. Further, the fin 12 may include only one of the projecting

portions

124 and 125.

Further, for example, the first strut 126 may be provided from the center instead of the end of the first side plate 121 in the longitudinal direction. Alternatively, the first strut 126 may be provided at the upper end of the first side plate 121. The same may be applied to the second strut portion 127.

Further, for example, the fin 12 is not limited to a U-shaped section, but may have an L-shaped section. For example, the fin 12 may include the bottom plate 120 and only one of the first side plate 121 and the second side plate 122. Further, for example, the fins 12 including only the first side plate 121 may be fixed by press-fitting into the base 11. That is, the fin 12 may not include the bottom plate 120.

For example, in the above-described embodiment, the example in which the planar view shape of the sub fin 13 is an ellipse or an ellipse has been described, but the present invention is not limited thereto. For example, the sub fin 13 may be a plate-like fin erected on the outer bottom surface 110b, and may have a rectangular shape when viewed from above. Alternatively, the sub fin 13 may be a cylindrical fin standing on the outer bottom surface 110b, and the top view shape may be an annular shape or a rectangular shape.

In addition, for example, in the above embodiment, the sub fin 13 is provided between every two adjacent fins 12, but this is not restrictive. Only one sub fin 13 may be provided on the outer bottom surface 110b.

Further, for example, in the above-described embodiment, the base 11 is disk-shaped, that is, an example in which each of the outer bottom surface 110b and the inner bottom surface 110a is circular in plan view is shown, but the present invention is not limited thereto. The base 11 may have a rectangular plate shape, and the planar view shape of each of the outer bottom surface 110b and the inner bottom surface 110a may be a polygon such as a rectangle or a square.

Further, for example, in the above-described embodiment, the example in which the lighting device 1 is an embedded lighting device such as a downlight has been described, but the present invention is not limited thereto. The lighting fixture 1 may be a spotlight or the like.

Further, for example, in the above-described embodiment, the heat sink 10 is used as the fixture body of the lighting fixture 1, but the present invention is not limited thereto. The heat sink 10 can be used to radiate heat generating components such as a power circuit.

In addition, the embodiment can be realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention, or a form obtained by subjecting each embodiment to various modifications conceived by those skilled in the art. Forms are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 10 Heat sink 11 Base 12 Fin 13 Sub fin 20 Light source 110 Bottom part 110a Inner bottom face 110b Outer bottom face 110c Outer peripheral edge 112 Mounted part 113 Groove 113a First side wall 113b Second side wall 114 Projection part 120 Bottom plate 121 First side plate 122 First 2 side plate 123 Through-

holes

124, 125 Protruding portion 126 First strut portion 127 Second strut portion 140 Air gap

Claims

A bottomed cylindrical base,
A plurality of fins radially disposed on an outer bottom surface of the bottom of the base;
A sub-fin disposed on the outer bottom surface between two adjacent fins of the plurality of fins;
The height of the sub fin from the outer bottom surface is lower than the height of the fin from the outer bottom surface.
The heat sink according to claim 1, wherein the base and the sub fin are integrally molded products.
When the outer bottom surface is viewed in plan view,
The outer shape of the sub-fin is an ellipse or an ellipse,
The heat sink according to claim 1 or 2, wherein the sub-fins are arranged such that a longitudinal direction thereof follows a radial direction of the plurality of fins.
The heat sink according to any one of claims 1 to 3, wherein the sub fins are arranged between the two adjacent fins.
The heat sink according to any one of claims 1 to 4, wherein the sub fin is disposed at an equal distance from the two adjacent fins when the outer bottom surface is viewed in plan.
The heat sink according to any one of claims 1 to 5, wherein the sub-fin is disposed along an outer peripheral edge of the outer bottom surface when the outer bottom surface is viewed in plan.
The heat sink according to any one of claims 1 to 6, wherein the plurality of fins are configured separately from the base.
On the inner bottom surface of the bottom portion, a groove is provided along the outer periphery of the attached portion to which the light source is attached,
The groove has a first side wall close to the mounted portion, and a second side wall separated from the mounted portion from the first side wall,
The first side wall is perpendicular to the inner bottom surface;
The heat sink according to any one of claims 1 to 7, wherein the second side wall is inclined with respect to the inner bottom surface.
At least one of the plurality of fins is
A bottom plate provided with a through hole;
A side plate erected on the bottom plate,
The base has a protrusion inserted into the through hole,
The base and the bottom plate are thermally connected via the protrusions,
The heat sink according to any one of claims 1 to 8, wherein a gap is provided between the bottom plate and the outer bottom surface.
At least one of the plurality of fins is
The bottom plate,
A pair of first and second side plates erected on the bottom plate;
The heat sink according to any one of claims 1 to 8, further comprising a first projecting portion that extends from the first side plate toward the second side plate.
At least one of the plurality of fins further includes:
The heat sink according to claim 10, further comprising a second projecting portion extending from the second side plate toward the first side plate.
The heat sink according to claim 10 or 11, wherein a root of the first projecting portion has a round shape.
When the outer bottom surface is viewed in plan view,
The bottom plate has a protruding portion protruding outward of the outer bottom surface,
The heat sink according to any one of claims 10 to 12, wherein a tip of the protruding portion is located on an outer peripheral edge of the outer bottom surface.
The plan view shape of the outer bottom surface is a circle,
The heat sink according to any one of claims 1 to 13, wherein each of the plurality of fins is elongated along the radial direction of the outer bottom surface and is arranged at equal intervals.
A heat sink according to any one of claims 1 to 14,
A light source attached to an inner bottom surface of the bottom.