heat sink

Abstract

To provide a heat sink that can improve the cooling performance.SOLUTION: A heat sink 100 includes: a base part 10 which has a first surface 10a; and multiple heat dissipation plates 20 which are arranged side-by-side on the first surface 10a along a first direction. The multiple heat dissipation plates 20 include multiple plates 21 that have multiple first tongue piece parts 23 and multiple second tongue piece parts 24. The multiple first tongue piece parts 23 have first root parts on one side in a second direction that intersects the first direction and protrude toward one side in the first direction in such a state that an outer peripheral part except for the first root parts is separated from the plate 21. The multiple second tongue piece parts 24 have second root parts on one side in the second direction and protrude toward the other side in the first direction in such a state that an outer peripheral part except for the second root parts is separated from the plate 21.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a heat sink, and more particularly to an air-cooled heat sink used as a heat dissipation member for electronic components that generate a large amount of heat, such as thyristors and power transistors. [Background technology]

[0002] As an air-cooled heat sink for dissipating heat from electronic components that generate a large amount of heat, such as thyristors and power transistors, Japanese Patent Laid-Open Publication No. 10-4159 (Patent Document 1) discloses a configuration in which multiple heat sinks are arranged in parallel on one side of a component mounting board, and each of the multiple heat sinks has a rear portion and protrusions that are formed by cutting three sides and bending the inner parts to form a cut-up. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-4159 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the air-cooled heat sink disclosed in Patent Document 1, the multiple protrusions on each heat sink are cut and raised in the same direction. Specifically, the multiple protrusions have a base that faces one side of the component mounting board, and the other three sides excluding the base are cut and raised so that they are approximately perpendicular to the heat sink.

[0005] For this reason, it cannot be said that cooling performance has been sufficiently considered, and there is still room for improvement in the configuration of the heat sink.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and an object of the present disclosure is to provide a heat sink that can improve cooling performance. [Means for solving the problem]

[0007] A heat sink according to the present disclosure includes a base having a first surface and a plurality of heat dissipation plates arranged side by side on the first surface along a first direction. The plurality of heat dissipation plates include a plurality of plates having a plurality of first tongue portions and a plurality of second tongue portions. The plurality of first tongue portions have a first root portion on one side in a second direction perpendicular to the first direction, and protrude toward the one side in the first direction with their outer peripheries excluding the first root portion separated from the plates. The plurality of second tongue portions have a second root portion on the one side in the second direction, and protrude toward the other side in the first direction with their outer peripheries excluding the second root portion separated from the plates.

[0008] In the heat sink according to the present disclosure, when viewed from the first direction, the plurality of first tongue portions and the plurality of second tongue portions may be arranged in a staggered pattern.

[0009] In the heat sink based on the present disclosure, the plurality of heat dissipation plates may include a portion configured to collect cooling air toward the inside of the first direction when cooling air flows from one side of the second direction toward the other side of the second direction.

[0010] In the heat sink according to the present disclosure, the plurality of heat dissipation plates may include one or more first outer plates disposed on one side of the plurality of plates in the first direction and one or more second outer plates disposed on the other side of the plurality of plates in the first direction. In this case, the first outer plate may have a plurality of first outer tongues, and the second outer plate may have a plurality of second outer tongues. The plurality of first outer tongues may have a third root portion on the other side of the second direction, and an outer periphery excluding the third root portion may protrude toward the one side of the first direction while being separated from the first outer plate. The plurality of second outer tongues may have a fourth root portion on the other side of the second direction, and an outer periphery excluding the fourth root portion may protrude toward the other side of the first direction while being separated from the second outer plate.

[0011] In the heat sink according to the present disclosure, each of the plurality of plates has a first end portion located on a side where the base portion is located, a second end portion located on an opposite side to the side where the base portion is located, a first main surface located on the one side in the first direction, and a second main surface located on the other side in the first direction. In this case, when the smaller angle between the first tongue portion and the first main surface is defined as a first opening angle, the first opening angle of one of the plurality of first tongue portions located on the second end side may be larger than the first opening angle of one of the plurality of first tongue portions located on the first end side. Furthermore, when the smaller of the angles formed by the second tongue portion and the second main surface is defined as the second opening angle, the second opening angle of the second tongue portion of the plurality of second tongue portions located on the second end side may be larger than the second opening angle of the second tongue portion of the plurality of second tongue portions located on the first end side.

[0012] In the heat sink according to the present disclosure, each of the plurality of plates has a first end located on the side where the base portion is located and a second end located on the opposite side from the side where the base portion is located. In this case, when a direction parallel to a direction from the first end toward the second end is defined as a width direction, a width of one of the plurality of first tongue portions located on the second end side may be larger than a width of one of the plurality of first tongue portions located on the first end side. Furthermore, a width of one of the plurality of second tongue portions located on the second end side may be larger than a width of one of the plurality of second tongue portions located on the first end side. [Effects of the Invention]

[0013] According to the present disclosure, it is possible to provide a heat sink that can improve cooling performance. [Brief explanation of the drawings]

[0014] [Figure 1] 2 is a view of the heat sink according to the first embodiment as viewed from a first direction. FIG. [Figure 2] 3 is a view of the heat sink according to the first embodiment as seen from a second direction perpendicular to the first direction. FIG. [Figure 3] 3 is a view of adjacent heat dissipation plates in the heat sink according to the first embodiment, as viewed from the direction of arrow III in FIG. 2. FIG. [Figure 4] 4 is a diagram showing how air flows in the heat sink according to the first embodiment. FIG. [Figure 5] 10 is a view of the heat sink according to the second embodiment as viewed from a second direction. FIG. [Figure 6] 10 is a diagram showing how air flows in the heat sink according to the second embodiment. FIG. [Figure 7] 11 is a view of the heat sink according to the third embodiment as viewed from a second direction. FIG. [Figure 8] 10 is a view of a heat sink according to a third embodiment as viewed from a first direction. FIG. [Figure 9]10A and 10B are diagrams showing the shape of a heat dissipation plate at a portion located on the base side in a heat sink according to a third embodiment. [Figure 10] 10A and 10B are diagrams showing the shape of a heat dissipation plate at a portion located on the opposite side to the side where the base portion is located in a heat sink according to a third embodiment. [Figure 11] 10 is a view of the heat sink according to the fourth embodiment as viewed from a second direction. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

[0016] In each figure, the X-axis direction is the first direction, the Y-axis direction is the second direction perpendicular to the first direction, and the Z-axis direction is the third direction perpendicular to the X-axis direction (first direction) and the Y-axis direction (second direction).

[0017] (Embodiment 1) Fig. 1 is a view of the heat sink according to embodiment 1 as seen from a first direction. Fig. 2 is a view of the heat sink according to embodiment 1 as seen from a second direction perpendicular to the first direction. Fig. 3 is a view of adjacent heat dissipation plates in the heat sink according to embodiment 1 as seen from the direction of arrow III shown in Fig. 2. The heat sink 100 according to embodiment 1 will be described with reference to Figs. 1 to 3.

[0018] As shown in FIGS. 1 and 2, the heat sink 100 according to the first embodiment includes a base portion 10 and a plurality of heat dissipation plates 20. As shown in FIG.

[0019] The base portion 10 is, for example, a substrate on which the electronic component 5 is mounted, and has a plate-like shape. The base portion 10 has good thermal conductivity. The base portion 10 has a first surface 10a located on one side in the third direction (Z-axis direction) and a second surface 10b located on the other side in the Z-axis direction.

[0020] The electronic component 5 is mounted on the second surface 10b. The electronic component 5 is, for example, a component that generates a large amount of heat, such as a thyristor or a power transistor.

[0021] A blower 90 is disposed on one side of the heat sink 100 in the second direction (Y-axis direction). The blower 90 blows cooling air toward the plurality of heat dissipation plates 20. The blower 90 blows the cooling air from one side to the other in the second direction, as indicated by arrow AR1 in FIG. 1. A fan, for example, can be used as the blower 90.

[0022] The heat conducted from the electronic component 5 to the heat dissipation plate 20 via the base portion 10 is dissipated by the cooling air.

[0023] The plurality of heat dissipation plates 20 are arranged side by side on the first surface 10a along the first direction. The plurality of heat dissipation plates 20 include a plurality of plates 21 having a plurality of first tongue portions 23 and a plurality of second tongue portions 24.

[0024] Each of the plurality of plates 21 has a first main surface 21a, a second main surface 21b, a first end 21c, and a second end 21d.

[0025] The first main surface 21a is located on one side in the first direction. The second main surface 21b is located on the other side in the first direction. The first end 21c is located on the side where the base portion 10 is located. The first end 21c is connected to the base portion 10. The second end 21d is located on the opposite side to the side where the base portion 10 is located. The second end 21d is a free end.

[0026] The plurality of first tongue portions 23 have first root portions 23d on one side in the second direction. The plurality of first tongue portions 23 protrude toward one side in the first direction with their outer peripheries excluding the first root portions 23d separated from the plate 21. As a result, when viewed from the first direction, openings 23h are formed in the regions of the plate 21 where the first tongue portions 23 are separated.

[0027] The first tongue portion 23 is inclined at a predetermined angle with respect to the first main surface 21a. The first tongue portion 23 is inclined so as to move away from the plate 21 (more specifically, the first main surface 21a) toward the other side in the second direction (the downstream side in the air blowing direction).

[0028] The second tongue portions 24 each have a second root portion 24d on one side in the second direction. The second tongue portions 24 each protrude toward the other side in the first direction with their outer peripheries, excluding the second root portions 24d, separated from the plate 21. As a result, when viewed from the first direction, an opening 24h is formed in the plate 21 in the region where the second tongue portion 24 is separated.

[0029] The second tongue portion 24 is inclined at a predetermined angle with respect to the second main surface 21b. The second tongue portion is inclined so as to move away from the plate 21 (more specifically, the second main surface 21b) toward the other side in the second direction (the downstream side in the air blowing direction).

[0030] When viewed from the first direction, the plurality of first tongue portions 23 and the plurality of second tongue portions 24 are arranged in a staggered pattern.

[0031] Fig. 4 is a diagram showing how air flows in the heat sink according to embodiment 1. For convenience, Fig. 4 shows two adjacent heat dissipation plates among the plurality of heat dissipation plates.

[0032] As shown in Figure 4, when cooling air is blown by the blower device 90 from one side in the second direction to the other side in the second direction, the cooling air is dispersed by a plurality of first tongue portions 23 and a plurality of second tongue portions 24 provided on two adjacent heat dissipation plates 20.

[0033] Specifically, for example, the cooling air passing between one heat dissipation plate 20 and the other heat dissipation plate 20 snakes toward the other side of the second direction, as shown by arrow AR2, due to the second tongue portion 24 of the heat dissipation plate 20 provided on one side of the first direction (right side in Figure 4) and the first tongue portion 23 of the heat dissipation plate 20 provided on the other side of the first direction (left side in Figure 4).

[0034] Furthermore, since the first tongue portion 23 and the second tongue portion 24 have their outer peripheries separated from the plate 21 except for the first root portion 23d and the second root portion 24d, the cooling air passing between one heat dissipation plate 20 and the other heat dissipation plate 20 can also move through the openings 23h, 24h to the gap between two heat dissipation plates 20 located adjacent to each other in the first direction.

[0035] For example, cooling air passing between one heat dissipation plate 20 and the other heat dissipation plate 20 can move to one side in the first direction through an opening 23h provided on one side in the first direction, as shown by arrow AR3.

[0036] In addition, the cooling air passing between one heat dissipation plate 20 and the other heat dissipation plate 20 can move to the other side of the first direction through an opening 24h provided on the other side of the first direction, as shown by arrow AR4.

[0037] In this way, by adjusting the flow of cooling air using the above-mentioned multiple first tongue portions 23 and multiple second tongue portions 24, the heat dissipation properties of the heat dissipation plate 20 can be improved, and cooling efficiency can be enhanced.

[0038] In this case, by arranging the plurality of first tongue portions 23 and the plurality of second tongue portions 24 in a staggered pattern, the cooling efficiency can be improved more effectively.

[0039] (Embodiment 2) Fig. 5 is a view of the heat sink according to embodiment 2 as seen from a second direction. Fig. 6 is a view showing how air flows in the heat sink according to embodiment 2. The heat sink 100A according to embodiment 2 will be described with reference to Figs. 5 and 6.

[0040] 5 and 6, the heat sink 100A according to the second embodiment differs from the heat sink 100 according to the first embodiment in the configuration of the plurality of heat dissipation plates 20. The other configurations are almost the same.

[0041] The plurality of heat dissipation plates 20 include portions provided to collect the cooling air toward the inside in the first direction when the cooling air flows from one side in the second direction toward the other side in the second direction.

[0042] Specifically, the plurality of heat dissipation plates 20 include a plurality of plates 21, a plurality of first outer plates 31, and a plurality of second outer plates 41. The plurality of first outer plates 31 and the plurality of second outer plates 41 correspond to portions provided to collect cooling air toward the inside in the first direction.

[0043] The multiple plates 21 have the same configuration as the plates 21 according to embodiment 1. The multiple first outer plates 31 are located on one side in the first direction relative to the multiple plates 21. That is, the multiple first outer plates 31 are provided in a region R1 located on one side in the first direction relative to a region R2 in which the multiple plates 21 are provided. The multiple first outer plates 31 are arranged on the first surface 10a.

[0044] Each of the multiple first outer plates 31 includes a first main surface 31a and a second main surface 31b facing each other in the first direction, and multiple first outer tongue portions 33. The first main surface 31a is located on one side in the first direction, and the second main surface 31b is located on the other side in the first direction.

[0045] The first outer tongue portions 33 have third root portions 33d on the other side in the second direction. The first outer tongue portions 33 protrude toward one side in the first direction with their outer peripheries excluding the third root portions 33d separated from the first outer plate 31. As a result, when viewed from the first direction, openings are formed in the regions of the first outer plate 31 where the first outer tongue portions 33 are separated.

[0046] The first outer tongue portion 33 is inclined at a predetermined angle relative to the first outer plate 31. The first outer tongue portion 33 is inclined so as to move away from the first outer plate 31 toward one side in the second direction (the upstream side in the air blowing direction).

[0047] The second outer plates 41 are located on the other side in the first direction with respect to the plates 21. That is, the second outer plates 41 are provided in a region R2 located on the other side in the first direction with respect to the region R2 in which the plates 21 are provided. The second outer plates 41 are arranged on the first surface 10a.

[0048] Each of the multiple second outer plates 41 includes a first main surface 41a and a second main surface 41b facing each other in the first direction, and multiple second outer tongue portions 43. The first main surface 41a is located on one side in the first direction, and the second main surface 41b is located on the other side in the first direction.

[0049] The second outer tongue portions 43 have fourth root portions 43d on the other side in the second direction. The second outer tongue portions 43 protrude on the other side in the first direction with their outer peripheries excluding the fourth root portions 43d separated from the second outer plate 41. As a result, when viewed from the first direction, openings are formed in the regions of the second outer plate 41 where the second outer tongue portions 43 are separated.

[0050] The second outer tongue portion 43 is inclined at a predetermined angle relative to the second outer plate 41. The second outer tongue portion 43 is inclined so as to move away from the second outer plate 41 toward one side in the second direction.

[0051] As shown in FIG. 5, for example, the heat dissipation plate 20 arranged outside the electronic component 5 in the first direction is located away from the electronic component 5, and there is a concern that heat from the electronic component 5 may not be easily conducted.

[0052] In this embodiment, the heat dissipation plate 20 arranged on the outer side of the electronic component 5 in the first direction includes a first outer plate 31 and a second outer plate 41.

[0053] Therefore, when air is blown from the blower 90, as shown in Figure 6, the cooling air is collected so as to flow inward in the first direction by the first outer tongue portion 33 and the second outer tongue portion 43 provided on the first outer plate 31 and the second outer plate 41.

[0054] Specifically, the cooling air that hits the first outer tongue portion 33 passes through an opening formed in the area where the first outer tongue portion 33 is separated, and is rectified so that it flows inward in the first direction (toward the center in the first direction).

[0055] The cooling air that strikes the second outer tongue piece 43 passes through an opening formed in the area where the second outer tongue piece 43 is cut off, and is rectified so as to flow inward in the first direction.

[0056] As a result, in embodiment 2, cooling air can be collected at multiple heat dissipation plates 20 arranged in the center in the first direction, where heat is easily transferred from electronic component 5, thereby further improving cooling efficiency.

[0057] In addition, in embodiment 2, an example has been described in which multiple first outer plates 31 and multiple second outer plates 41 are provided, but this is not limited to this, and there may be only one first outer plate 31 and one second outer plate 41.

[0058] (Embodiment 3) Fig. 7 is a view of the heat sink according to embodiment 3 seen from a second direction. Fig. 8 is a view of the heat sink according to embodiment 3 seen from a first direction. A heat sink 100B according to embodiment 3 will be described with reference to Figs. 7 and 8.

[0059] 7 and 8, the heat sink 100B according to the third embodiment differs from the heat sink 100 according to the first embodiment in the configuration of the plurality of heat dissipation plates 20. The other configurations are almost the same.

[0060] Specifically, in each of the multiple heat dissipation plates 20, the first opening angle of the first tongue portion 23 and the opening angle of the second tongue portion 24, which will be described later, differ between the region R3 located on the first end portion 21c side and the region R4 located on the second end portion 21d side.

[0061] Accordingly, as shown in Figure 8, when viewed from the first direction, the distance L3 from the tip of the first tongue portion 23 provided in region R4 to the end of the opening 23h located on the other side of the second direction is greater than the distance L1 from the tip of the first tongue portion 23 provided in region R3 to the end of the opening 23h located on the other side of the second direction.

[0062] When viewed from the first direction, the distance L4 from the tip of the second tongue portion 24 provided in region R4 to the end of the opening 24h located on the other side of the second direction is greater than the distance L2 from the tip of the second tongue portion 24 provided in region R3 to the end of the opening 24h located on the other side of the second direction.

[0063] FIG. 9 is a diagram showing the shape of a heat dissipation plate at a portion located on the base side in a heat sink according to the third embodiment.

[0064] 9, when the smaller angle between the first tongue portion 23 and the first main surface 21a is defined as the first opening angle, the first opening angle on the region R3 side (first end 21c side) is θ1. When the smaller angle between the second tongue portion 24 and the second main surface 21b is defined as the second opening angle, the second opening angle on the region R3 side is θ2.

[0065] FIG. 10 is a diagram showing the shape of the heat dissipation plate of the heat sink according to the third embodiment, which is located on the opposite side to the side where the base portion is located.

[0066] 10, on the region R4 side (the second end 21d side), the first opening angle is θ3, which is larger than θ1. On the region R4 side, the second opening angle is θ4, which is larger than θ2. The first opening angle θ1 and the second opening angle θ2 are approximately equal in value, and the first opening angle θ3 and the second opening angle θ4 are approximately equal in value.

[0067] Thus, in the third embodiment, the first opening angle of the first tongue portion 23 located on the second end 21d side of the plurality of first tongue portions 23 is larger than the first opening angle of the first tongue portion 23 located on the first end 21c side of the plurality of first tongue portions 23. The second opening angle of the second tongue portion 24 located on the second end 21d side of the plurality of second tongue portions 24 is larger than the second opening angle of the second tongue portion 24 located on the first end 21c side of the plurality of second tongue portions 24.

[0068] Region R4 is located farther from the electronic component 5 than region R3, and heat from the electronic component 5 is less likely to be conducted to region R4. In this case, by adjusting the opening angles between region R3 and region R4 as described above, the speed of the cooling air can be increased on region R4. This allows heat to be dissipated effectively even on region R4, further improving cooling efficiency.

[0069] (Fourth embodiment) 11 is a view of the heat sink according to embodiment 4 as seen from the second direction. With reference to FIG. 11, the heat sink 100C according to embodiment 4 will be described.

[0070] 11, the heat sink 100C according to the fourth embodiment differs from the heat sink 100 according to the first embodiment in the configuration of the plurality of heat dissipation plates 20. The other configurations are almost the same.

[0071] 11, in the fourth embodiment, when the width direction is defined as a direction parallel to the direction from the first end 21c to the second end 21d, the width D3 of the first tongue portion 23 provided in the region R4 is larger than the width D1 of the first tongue portion 23 provided in the region R3. The width D4 of the second tongue portion 24 provided in the region R4 is larger than the width D2 of the second tongue portion 24 provided in the region R3.

[0072] Region R4 is located farther from the electronic component 5 than region R3, and heat from the electronic component 5 is less likely to be conducted to region R4. In this case, by adjusting the widths of the first tongue portion 23 and the second tongue portion 24 on the region R3 side and the region R4 side as described above, the wind speed of the cooling air can be increased on the region R4 side. This allows heat to be dissipated effectively even on the region R4 side, further improving cooling efficiency.

[0073] (Other variations) As described above, when there are multiple embodiments, it is intended from the beginning that the characteristic portions of each embodiment will be appropriately combined unless otherwise specified.

[0074] For example, the configuration of embodiment 2 may be combined with the configuration of embodiment 3 and / or embodiment 4. Specifically, when the smaller of the angles formed between first outer tongue portion 33 and first main surface 31a (see FIG. 5) is defined as the first opening angle, the first opening angle of one of the plurality of first outer tongue portions 33 located farther from first surface 10a of the base portion (toward second end 21d) may be larger than the first opening angle of one of the plurality of first outer tongue portions 33 located closer to first surface 10a (toward first end 21c).

[0075] If the smaller of the angles formed by the second outer tongue portion 43 and the second main surface 41b (see Figure 5) is defined as the second opening angle, the second opening angle of the second outer tongue portion 43 among the multiple second outer tongue portions 43 located on the side farther from the first surface 10a of the base portion 10 (towards the second end 21d) may be larger than the second opening angle of the second outer tongue portion 43 among the multiple second outer tongue portions 43 located on the side closer to the first surface 10a (towards the first end 21c).

[0076] If the direction parallel to the direction in which the heat dissipation plate 20 extends from the first surface 10a (the direction from the first end 21c to the second end 21d) is defined as the width direction, the width of the first outer tongue portion 33 among the multiple first outer tongue portions 33 located farther from the first surface 10a of the base portion 10 may be larger than the width of the first outer tongue portion 33 among the multiple first outer tongue portions 33 located closer to the first surface 10a.

[0077] The width of the second outer tongue portion 43 among the multiple second outer tongue portions 43 located farther from the first surface 10a of the base portion 10 may be larger than the width of the second outer tongue portion 43 among the multiple second outer tongue portions 43 located closer to the first surface 10a.

[0078] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0079] 5 Electronic component, 10 Base portion, 10a First surface, 10b Second surface, 20 Heat dissipation plate, 21 Plate, 21a First main surface, 21b Second main surface, 21c First end, 21d Second end, 23 First tongue portion, 23d First root portion, 23h Opening, 24 Second tongue portion, 24h Opening, 24d Second root portion, 31 First outer plate, 31a First main surface, 33 First outer tongue portion, 33d Third root portion, 41 Second outer plate, 41b Second main surface, 43 Second outer tongue portion, 43d Fourth root portion, 90 Blower device, 100, 100A, 100B, 100C Heat sink, D1, D2, D3, D4 Width, L1, L2, L3, L4 Distance, R1,R2,R3,R4 area.

Claims

1. a base portion having a first surface; a plurality of heat dissipation plates arranged side by side on the first surface along a first direction; the plurality of heat dissipation plates include a plurality of plates having a plurality of first tongue portions and a plurality of second tongue portions; the plurality of first tongue portions have first root portions on one side in a second direction perpendicular to a normal direction of the first surface and the first direction, and outer peripheries excluding the first root portions protrude toward the one side in the first direction in a state separated from the plate; the plurality of second tongue portions have second root portions on the one side in the second direction, and outer peripheries excluding the second root portions protrude toward the other side in the first direction in a state where they are separated from the plate; the plurality of heat dissipation plates include portions provided to collect cooling air toward an inner side in the first direction when the cooling air flows from the one side in the second direction toward the other side in the second direction, the plurality of heat dissipation plates include one or more first outer plates arranged on the one side of the plurality of plates in the first direction, and one or more second outer plates arranged on the other side of the plurality of plates in the first direction, the first outer plate has a plurality of first outer tongue portions; the second outer plate has a plurality of second outer tongue portions; the plurality of first outer tongue portions have third root portions on the other side in the second direction, and outer peripheries excluding the third root portions protrude toward the one side in the first direction in a state separated from the first outer plate, A heat sink, wherein the plurality of second outer tongue portions have a fourth root portion on the other side in the second direction, and the outer peripheral portion excluding the fourth root portion protrudes to the other side in the first direction while being detached from the second outer plate.

2. Each of the plurality of plates has a first end located on the side where the base portion is located and a second end located on the opposite side from the side where the base portion is located, When a direction parallel to a direction from the first end toward the second end is defined as a width direction, a width of a first tongue portion located on the second end side among the plurality of first tongue portions is larger than a width of a first tongue portion located on the first end side among the plurality of first tongue portions, The heat sink of claim 1, wherein the width of the second tongue portion located on the second end side among the plurality of second tongue portions is greater than the width of the second tongue portion located on the first end side among the plurality of second tongue portions.

3. A base portion having a first surface; a plurality of heat dissipation plates arranged side by side on the first surface along a first direction; the plurality of heat dissipation plates include a plurality of plates having a plurality of first tongue portions and a plurality of second tongue portions; the plurality of first tongue portions have first root portions on one side in a second direction perpendicular to a normal direction of the first surface and the first direction, and outer peripheries excluding the first root portions protrude toward the one side in the first direction in a state separated from the plate; the plurality of second tongue portions have second root portions on the one side in the second direction, and outer peripheries excluding the second root portions protrude toward the other side in the first direction in a state where they are separated from the plate; Each of the plurality of plates has a first end portion located on the side where the base portion is located, a second end portion located on the opposite side to the side where the base portion is located, a first main surface located on the one side in the first direction, and a second main surface located on the other side in the first direction, when a smaller angle between the first tongue portion and the first main surface is defined as a first opening angle, the first opening angle of the first tongue portion located on the second end side among the plurality of first tongue portions is larger than the first opening angle of the first tongue portion located on the first end side among the plurality of first tongue portions, A heat sink, wherein when the smaller of the angles formed by the second tongue portion and the second main surface is defined as a second opening angle, the second opening angle of the second tongue portion among the plurality of second tongue portions that is located on the second end side is larger than the second opening angle of the second tongue portion among the plurality of second tongue portions that is located on the first end side.

4. The heat sink according to claim 1 , wherein the first tongue portions and the second tongue portions are arranged in a staggered pattern when viewed from the first direction.

Images