Heat sink

Abstract

To provide a heat sink which has relatively small fins and yet achieves a good balance between improving heat dissipation efficiency and suppressing pressure loss.SOLUTION: A heat sink 1 includes a base 10 and a plurality of fins 20 connected to the base 10. The heat sink 1 has a plurality of fin arrays 30 arranged at a predetermined pitch p. Adjacent fin arrays 30 are spaced apart from each other at a predetermined interval. When the plurality of fins 20 are viewed along the width direction of the fins 20, the fins 20 are arranged in a staggered pattern. The fins 20 are made of a metal plate, and the surface of the metal plate is scraped away with the blade of a cutting tool to form a plurality of plate-like fins 20 that are integrally formed and stand upright with the base 10 of the metal plate.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a heat sink. [Background technology]

[0002] Conventionally, a heat sink is known that is made up of an array of long, flat fins that are attached so as to rise from a base. A coolant such as air is circulated between adjacent fins, and heat is transferred from the surface of the fins to the coolant, thereby dissipating heat. It is also known that dividing a long, flat fin by making slits creates turbulent flow in the coolant, thereby improving heat dissipation efficiency (see Patent Document 1. See Figures 10 and 11 for flat fins. See Figures 4 and 9 for divided fins. See paragraphs

[0050] to

[0052] for an explanation of the generation of turbulent flow).

[0003] Furthermore, a structure in which divided fins are arranged in a staggered manner has also been proposed (see FIG. 2 of Patent Document 2). By arranging the fins in a so-called staggered manner, the turbulent effect can be promoted, and the heat dissipation efficiency can be further improved. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-204606 A [Patent Document 2] JP 2009-260013 A Summary of the Invention [Problem to be solved by the invention]

[0005] The heat sinks described in Patent Documents 1 and 2 are intended to cool inverters, and are based on a technology that uses relatively large fins to dissipate heat. Such large heat dissipating fins are generally realized by extrusion molding.

[0006] On the other hand, it is generally difficult to realize a compact heat sink in which small, thin fins are arranged at a narrow pitch using the techniques described in Patent Documents 1 and 2 (see paragraph

[0005] of Patent Document 2, etc.). Furthermore, it is even more difficult to realize a staggered arrangement.

[0007] Furthermore, if you try to forcefully create a small radiator using extrusion molding, it is difficult to extrude thin fins, so you have no choice but to increase the thickness of the fins in the design, and therefore have to reduce the gaps between adjacent fins (the gaps through which the refrigerant flows). Due to this trade-off, the pressure loss of the refrigerant generally becomes more noticeable as the radiator becomes more compact.

[0008] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a heat sink that has relatively small fins but can achieve a good balance between increasing heat dissipation efficiency and reducing pressure loss. [Means for solving the problem]

[0009] SUMMARY OF THE PRESENT EMBODIMENT According to one aspect of the present invention, a heat sink is provided that includes a base and a number of fins coupled from the base. The heat sink has multiple "fin arrays" formed in which fins are arranged at a predetermined pitch along a direction perpendicular to the width direction of the fins. Adjacent fin arrays are spaced apart from each other by a predetermined distance. When the multiple fins are viewed along the width direction of the fins, they are arranged in a staggered pattern. Here, the fins are made of a metal plate, and the surface of the metal plate is scraped away with the blade of a cutting tool to form multiple plate-like fins that stand up integrally with the base of the metal plate.

[0010] According to another aspect, there is also provided a heat sink including a base and a plurality of fins coupled from the base. The heat sink has multiple fin arrays formed in which fins are arranged at a predetermined pitch along a direction perpendicular to the width direction of the fins. Adjacent fin arrays are spaced apart from each other at a predetermined interval. When the multiple fins are viewed along the width direction of the fins, they are arranged in a staggered pattern. Here, the thickness of the fins at their base ends is within a range of 0.1 to 1.0 mm. The multiple fins are also arranged with a predetermined pitch at their base ends within a range of 0.2 mm to 2.0 mm. Effect of the Invention

[0011] According to the present invention, it is possible to achieve a good balance between increasing heat dissipation efficiency and suppressing pressure loss, even with a relatively small fin. [Brief description of the drawings]

[0012] [Figure 1] 1 is a perspective view of a heat sink 1 according to a first embodiment. [Diagram 2] 1 is a cross-sectional view of a main part of a heat sink 1 according to a first embodiment. [Diagram 3] 1 is a diagram shown for explaining a fin array 30-n (n is a natural number) of the first embodiment. FIG. [Figure 4] 5A to 5C are diagrams for explaining the operation of the heat sink according to the first embodiment. [Diagram 5] FIG. 11 is a diagram shown for explaining a heat sink 2 according to a second embodiment. [Figure 6] FIG. 11 is a diagram shown for explaining a heat sink 3 according to a third embodiment. [Figure 7] FIG. 2 is a diagram shown for explaining a heat sink 4 according to a first modified example. [Figure 8] 13 is a diagram for explaining a heat sink 5 according to a second modification and a heat sink 6 according to a third modification. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The heat sink according to the present invention will be described below with reference to the drawings. Note that the explanations of the symbols common to each drawing can be applied to the explanations of the other drawings, so the explanations of the symbols in the other drawings will be omitted. Each drawing is a schematic diagram showing an example, and does not necessarily strictly reflect the actual dimensions, ratios, etc.

[0014] [Embodiment 1] 1. Configuration of heat sink 1 according to embodiment 1 Fig. 1 is a perspective view of a heat sink 1 according to embodiment 1. Fig. 2 is a cross-sectional view of a main part of the heat sink 1 according to embodiment 1. The cross-sectional view is a cross-sectional view of a main part of the heat sink 1 when cut along an imaginary plane PL1 and viewed along an arrow A in Fig. 1.

[0015] (1) Basic configuration As shown in FIGS. 1 and 2, a heat sink 1 according to the first embodiment is a heat sink including a base 10 and a plurality of fins 20 formed continuously from the base 10. As shown in FIG. The base 10 is a portion that becomes the base of the fins 20 described below, and has a predetermined thickness and spreads in a planar shape. In the first embodiment, "planar" refers to a flat surface, but it may also be a curved surface. The fins 20 are plate-shaped. The length of the fins 20 in the longitudinal direction when the heat sink 1 is viewed in a plan view is defined as the fin width W, and the dimension of the fins 20 in the direction (y direction in the figure) perpendicular to the width direction (x direction in the figure) is defined as the fin thickness T.

[0016] (2) Flow of the Inter-Fin Flow Channel 50 and the Refrigerant RF The fins 20 are arranged at a predetermined pitch as described below, and between adjacent fins, inter-fin flow paths 50 (see FIG. 2) through which the refrigerant RF flows are formed. The heat sink 1 has the back side of the base 10 fixed in close contact with the heat generating component, and dissipates heat by flowing the refrigerant RF on the front side on which the fins 20 are formed. The refrigerant RF is a cooling medium with fluidity, and may be, for example, air or a coolant liquid. The following description will be continued assuming that the refrigerant RF is introduced from the upper left side of the heat sink 1 in FIG. 1 (symbol RFin) and discharged from the lower right side (symbol RFout).

[0017] (3) Origin of Fin Array 30 The heat sink 1 has a "fin array 30" formed in which the fins 20 are arranged at a predetermined pitch p along a direction (y direction) perpendicular to the width direction of the fins. Regarding the multiple fins 20 constituting the fin array 30, the longitudinal direction of each fin 20 extends in the same x direction (the row direction in a matrix). Therefore, adjacent fins 20 are parallel to each other. In addition, the width of each fin 20 is the same length W. For example, in the fin array 30, -1 The width of each of the fins 20 belonging to the fin array 30 is the same W. Therefore, when the fin array 30 is viewed in the y direction, one end of each of the fins 20 (for example, the end indicated by the symbol e1 in FIG. 2) is aligned at the same position. The same is true for the other end of each of the fins 20. Furthermore, the thickness of each of the fins 20 is the same T.

[0018] (4) Multiple fin arrangement The heat sink 1 has a plurality of rows of fin arrays 30 as described above (reference numeral 30 -1 ,30 -2 ,30 -(2j) ,30 -(2j+1) (For example, fin array 30 -1 and fin array 30 -2 ) are spaced apart from each other by a predetermined distance INT. The gap separating adjacent fin arrays 30 will be referred to as a "gap portion 40."

[0019] (5) Staggered arrangement When the multiple fins 20 are viewed from another angle along the width direction of the fins, the fins 20 are arranged in a staggered configuration. For example, when the fins 20 are arranged along the imaginary line R1 in the row direction shown in FIG. 2, the fins 20 are arranged in a staggered pattern. Specifically, when the center position of each fin 20 in the width direction is taken into account, the first fin array 30 -1 The center c1 of the fin 20 belonging to the second fin array 30 is disposed below the imaginary line R1.-2 The center c2 of the fin 20 belonging to the second fin array 30 is disposed above the imaginary line R1. -3 The center c3 of the fin 20 belonging to the fourth fin array 30 is disposed below the imaginary line R1. -4 The center c4 of the fin 20 belonging to is disposed above the imaginary line R1, and the rest are similarly disposed alternately in a staggered manner.

[0020] The above describes the arrangement when focusing on the center c of the fin 20, but it is also possible to focus on the end of the fin 20 (for example, one end e1, e2, e3, e4, e5, etc. on the upstream side of the refrigerant RF), and even in such a case, the fins 20 are arranged in a staggered manner as shown in Figure 2.

[0021] Odd numbered fin arrangement 30 -1 ,30 -3 ,30 -(2j+1) The fins 20 belonging to the fin arrays 30 are arranged so as to coincide with a first straight line (a virtual straight line not shown). -2 ,30 -4 ,30 -(2j) The group of fins 20 belonging to the group ··· are arranged so as to coincide with a second straight line (a virtual straight line not shown) different from the first straight line.

[0022] (6) Cross section of fin 20 FIG. 3 shows the fin array 30 of the first embodiment. -n FIG. 3(a) is a plan view of the heat sink 1 as viewed along the arrow A in FIG. 1. FIG. 3(b) is a plan view of the first fin array 30. -1 3(a) is a cross-sectional view taken along line BB in FIG. 3(a), and FIG. 3(c) is a cross-sectional view taken along line BB in FIG. -2 FIG. 4 is a cross-sectional view taken along line DD in FIG.

[0023] 3(b) and 3(c), each fin 20 rises from the base 10 and is formed integrally and continuously with the base 10. The fins 20 have a curled cross section. In the example of embodiment 1, the thickness of the fin 20 is approximately constant from the base end 22 to near the tip 21 of the fin 20. Near the tip 21 of the fin 20, there is a tapered portion (reference number omitted) where the thickness of the fin becomes smaller toward the tip 21. In adjacent plate-like fins 20, an inter-fin flow path 50 is formed by the space surrounded by the opposing surfaces 23 of the fins 20 and the base portion 12 formed by the surface of the base portion 10 (the surface on which the fins 20 are formed).

[0024] Odd numbered fin arrangement 30 -(2j+1) The fins 20 at the ends of the even-numbered fin arrays 30 rise from a position that is recessed by a distance x from the end face of the base 10. -(2j) The endmost fin 20 rises from a position that is recessed by x+p·(½) from the end face of the base 10 .

[0025] Therefore, when the fins 20 belonging to each fin row are viewed in the fin width direction (x direction) of the heat sink 1, the odd-numbered fin arrays 30 -(2j+1) and the even-numbered fin array 30 -(2j) The fins 20 belonging to and are arranged with a half pitch offset from each other. Specifically, they are arranged with an offset of (p / 2) from each other (see Figures 3(b) and 3(c)).

[0026] In this case, the thickness T of the fin 20 at the base end 22 of the fin 20 is preferably within the range of 0.1 to 1.0 mm. Furthermore, the multiple fins 20 are preferably arranged at the base end 22 with a pitch p of a predetermined value within the range of 0.2 mm to 2.0 mm, and more preferably within the range of 0.2 mm to 0.8 mm.

[0027] 2. Structure of the heat sink 1 according to the first embodiment In the heat sink 1, the fins 20 are made of a metal plate (not shown), and the surface of the metal plate is scraped away with the blade of a cutting tool to form a plurality of plate-like fins 20 that are integrally formed and stand upright with the base 10 of the metal plate. Regarding the method of constructing such a heat sink 1, for example, the description of the manufacturing technology for heat sink fins described in JP 2014-212290 A by the same applicant can be directly incorporated as the contents of this specification.

[0028] When the metal plate is made of a material containing aluminum, the surfaces of the fins 20 may be anodized.

[0029] 3. Effects of the heat sink 1 according to the first embodiment Fig. 4 is a diagram for explaining the operation of the heat sink according to the first embodiment. Fig. 4(a) is a diagram corresponding to Fig. 2, in which only the essential parts are taken out. The flow of the refrigerant RF is indicated by a schematic thick arrow. Fig. 4(b) is an enlarged view of the essential parts, which is an enlarged view of the area surrounded by the dashed line F in Fig. 4(a), and is a diagram for explaining the state of the surface 23 of the fin 20.

[0030] (1) In the heat sink 1 according to the first embodiment, the fin arrays 30 are formed in a plurality of rows, and adjacent fin arrays 30 -(2j) ,30 -(2j+1) The fins 20 are spaced apart from each other at a predetermined interval. When the fins 20 are viewed along the width direction of the fins, the fins 20 are arranged in a staggered pattern.

[0031] Due to this configuration, as shown in FIG. 4(a), the flowing refrigerant RF flows through the next fin array 30 -(2j) Fin end of e 2j Each time the refrigerant RF hits the fins, it branches off and changes its flow direction, and this branch collides with and is stirred up by the flow of the refrigerant RF branched off from another inter-fin flow path, generating a "turbulent flow." Since the turbulent flow of the refrigerant RF clings to the surfaces 23 (side surfaces) of the fins, the refrigerant RF can be brought into dense contact with the surfaces 23 of the fins, thereby improving the cooling efficiency.

[0032] (2) As mentioned above, in the past, when trying to reduce the size of staggered fins, there was a trade-off between the fin thickness and the fin arrangement pitch, which resulted in the thickness having to be increased and resulting in large pressure loss. On the other hand, the fins in the heat sink 1 according to the first embodiment are made of a metal plate, and the surface of the metal plate is scraped off with the blade of a cutting tool to form a plurality of plate-like fins that stand up integrally with the base of the metal plate. In other words, fins with a relatively small thickness can be formed with ease. Therefore, according to the heat sink 1 of the first embodiment, it is possible to provide a small heat sink having fins with a small thickness despite the staggered arrangement.

[0033] Even if the arrangement pitch is set smaller, the thickness of the fins can be made smaller, so the flow resistance when the flow is diverted at the edge of the fins can be reduced and pressure loss can be suppressed. Note that "pressure loss" can also be defined as the loss of pressure that occurs when refrigerant flows between the fins when a certain pressure is applied from the outside.

[0034] From (1) and (2), the heat sink 1 according to the first embodiment can achieve a good balance between increasing heat dissipation efficiency and suppressing pressure loss, even with relatively small fins.

[0035] (3) The fin 20 in the first embodiment has a curled cross section. By configuring the fin 20 in a curled shape, it is possible to ensure a larger surface area than a fin having an upright shape when compared with a fin of the same height. Therefore, it is possible to improve the heat dissipation efficiency.

[0036] (4) As shown in Fig. 4(b) , in the first embodiment, the surface 23 of the fin 20 may be roughened. In other words, the surface 23 of the fin 20 being roughened can be said to have projections and recesses formed on the surface 23 of the fin 20.

[0037] Furthermore, when the metal plate material constituting the base 10 and the fins 20 is a material containing aluminum, the surface of the fins 20 may be anodized. In this case, unevenness is formed on the surface 23 of the fin during the anodization process.

[0038] By forming projections and recesses on the surfaces 23 of the fins 20 as described above, the surface area of ​​the fins 20 can be further increased, and turbulence of the refrigerant RF flowing near the surfaces 23 of the fins can be easily induced.

[0039] (5) In the first embodiment, the thickness T of the fin 20 at the base end 22 of the fin 20 is within a range of 0.1 to 1.0 mm, and the plurality of fins 20 are arranged with a predetermined pitch p at the base end 22 within a range of 0.2 mm to 2.0 mm. More preferably, the arrangement pitch p of the fins 20 is within a range of 0.2 mm to 0.8 mm.

[0040] In a preferred embodiment, the effect of the heat sink 1 according to the present invention can be maximized by configuring the fin thickness T and arrangement pitch p to fall within the above ranges.

[0041] [Embodiment 2] 5 is a diagram for explaining a heat sink 2 according to embodiment 2. Note that FIG. 5 corresponds to FIG.

[0042] The heat sink 2 according to the second embodiment basically has the same configuration as the heat sink 1 according to the first embodiment, but differs from the heat sink 1 according to the first embodiment in the setting of the fin width.

[0043] That is, as shown in FIG. 5, in the second embodiment, one fin array (e.g., reference numeral 30 -1 ) and the width W1 of the fins in another fin array (e.g., reference numeral 30a) arranged next to the first fin array. -2 In the example of FIG. 5, the width Wa of the fin in the even-numbered fin array 30a is different from the width Wa of the fin in the even-numbered fin array 30a. -(2j)The fin width Wa in the odd-numbered fin array 30 -(2j+1) The width W1 of the fin at the

[0044] In this way, the length of the inter-fin flow paths 50, 50a can be changed by appropriately changing the fin width W according to the fin array 30. This can also change the way turbulence occurs, which is expected to have the effect of eliminating stagnation of the refrigerant RF, and ultimately improve the heat dissipation efficiency.

[0045] Except for the setting of the fin width, the heat sink 2 according to the second embodiment has a basically similar configuration to the heat sink 1 according to the first embodiment, and therefore has the same effects as those of the heat sink 1 according to the first embodiment.

[0046] [Embodiment 3] 6 is a diagram for explaining a heat sink 3 according to embodiment 3. Note that FIG. 6 corresponds to FIG.

[0047] The heat sink 3 of embodiment 3 basically has the same configuration as the heat sink 1 of embodiment 1 and the heat sink 2 of embodiment 2, but differs from the heat sink 1 of embodiment 1 and the heat sink 2 of embodiment 2 in the setting of the fin thickness.

[0048] That is, as shown in FIG. 6, in the third embodiment, one fin array (e.g., reference numeral 30 -1 ) and the thickness T of the fins in another fin array (e.g., reference numeral 30b) arranged next to the first fin array. -3 ) is set to be different in size when compared with the fin thickness Tb at .

[0049] In this way, by appropriately changing the fin thickness T according to the fin array 30, the way in which the flow is divided as described in the section on the effects of the first embodiment changes. Furthermore, because the fin thickness T changes, the width of the inter-fin flow paths 50, 50b also changes. This makes it possible to change the way in which turbulence is generated, which is expected to have the effect of eliminating stagnation of the refrigerant RF, and ultimately improve the heat dissipation efficiency.

[0050] Except for the setting of the fin thickness, the heat sink 3 according to the embodiment 3 has a basically similar configuration to the heat sink 1 according to the embodiment 1 and the heat sink 2 according to the embodiment 2. Therefore, it has the same effects as the heat sink 1 according to the embodiment 1 and the heat sink 2 according to the embodiment 2.

[0051] Note that, here, the heat sink 3 has been described based on the case where the width W of the fins 20 in all fin arrays 30 in embodiment 1 is the same, but the concept of embodiment 3 can also be applied to the heat sink 2 of the configuration shown in embodiment 2.

[0052] Although the present invention has been described based on the above embodiment, the present invention is not limited to the above embodiment. It can be embodied in various forms without departing from the spirit of the present invention, and for example, the following modifications are also possible.

[0053] (1) In each embodiment, the description has been given on the assumption that the arrangement pitch of the fins 20 in all the fin arrays 30 is the same. However, the present invention is not limited to this. For example, as shown in FIG. 7, in one fin array (e.g., reference numeral 30 -1 ) and the pitch of another fin array (e.g., reference numeral 30c) arranged next to the one fin array. -2 The pitch in the odd-numbered fin array 30 may be set to be different from the pitch in the odd-numbered fin array 30 (variation 1). -(2j+1) The arrangement pitch of the fins 20 in the even-numbered fin array 30c is set to p. -(2j)The arrangement pitch of the fins 20 in is set to pc which is smaller than p. 7 is a diagram for explaining the heat sink 4 according to the modified example 1. This diagram corresponds to FIG.

[0054] It is possible to change the way turbulence occurs by changing the arrangement pitch of the fins 20 using the fin array 30. This is expected to have the effect of eliminating stagnation of the refrigerant RF, and ultimately to improve the heat dissipation efficiency.

[0055] (2) In each embodiment, the cross-sectional shape of the fin 20 has been described as having a generally constant thickness T except for the vicinity of the tip 21 of the fin 20. However, the present invention is not limited to this. 8(a) and 8(b), the fins 20 may be formed so that the thickness at the tip 21 is smaller than the thickness at the base end 22 (Modification 2 and Modification 3). Because the tip 21 of the fin 20 is thinner, the space on the tip 21 side of the fin in the inter-fin flow paths 50d, 50e can be made larger. This is expected to further increase the fluidity of the refrigerant RF and further reduce pressure loss. 8(a) is a diagram for explaining a heat sink 5 according to Modification 2, and FIG. 8(b) is a diagram for explaining a heat sink 6 according to Modification 3. For reference, these diagrams are cross-sectional views of the main parts corresponding to FIG. 3(b) or FIG. 3(c).

[0056] (3) In each embodiment, the base portion 12 of the base portion 10 constituting a part of the inter-fin flow passage is described as being formed approximately parallel to the back surface of the base portion 10 (see Figs. 3 and 8(a)). However, the present invention is not limited to this. As in the heat sink 6 of Fig. 8(b), the base portion 12e of the inter-fin flow passage 50e may be configured to be inclined with respect to the back surface of the base portion 10e (which is flat in the drawing).

[0057] (4) In the second and third embodiments and the first modification, examples have been shown in which the width W, thickness T, and arrangement pitch p of the fins 20 are changed in two stages, alternating as the number of the fin array 30 advances. However, the present invention is not limited to this. The width W, thickness T, and arrangement pitch p of the fins 20 may be changed once every few stages as the number of the fin array 30 advances. Furthermore, the width W, thickness T, and arrangement pitch p of the fins 20 are not limited to two-stage change, and may be changed in three or more stages. [Explanation of symbols]

[0058] 1, 2, 3, 4, 5, 6...heat sink, 10, 10e...base, 12, 12e...base, 20...fin, 21...(fin) tip, 22...(fin) base, 23...(fin) surface, 30...fin array, 40...(between adjacent fin arrays) gap, 50, 50a, 50b, 50d, 50e...inter-fin flow passage, INT...predetermined interval, RF...refrigerant

Claims

1. A heat sink comprising a base and a plurality of fins coupled to the base, The heat sink has a plurality of fin arrays formed in which the fins are arranged at a predetermined pitch along a direction perpendicular to the width direction of the fins, Adjacent fin arrays are spaced apart from each other by a predetermined interval, When the plurality of fins are viewed along the width direction of the fins, the fins are arranged in a staggered pattern, The fins are made of a metal plate, and the surface of the metal plate is scraped off with a blade of a cutting tool, so that the plurality of plate-shaped fins are formed upright integrally with the base of the metal plate. A heat sink characterized by:

2. 2. The heat sink according to claim 1, wherein the fins have a curled cross section.

3. 3. The heat sink according to claim 2, wherein the fins are formed so that the thickness at the tip end is smaller than the thickness at the base end.

4. The heat sink according to any one of claims 1 to 3, A heat sink characterized in that the surfaces of the fins are roughened.

5. The heat sink according to any one of claims 1 to 3, When the metal plate is made of a material containing aluminum, the surface of the fins is anodized.

6. A heat sink comprising a base and a plurality of fins coupled to the base, The heat sink has a plurality of fin arrays formed in which the fins are arranged at a predetermined pitch along a direction perpendicular to the width direction of the fins, Adjacent fin arrays are spaced apart from each other by a predetermined interval, When the plurality of fins are viewed along the width direction of the fins, the fins are arranged in a staggered pattern, The thickness of the fin at the base end is within the range of 0.1 to 1.0 mm, The plurality of fins are arranged at a pitch at the base end of the fins that is a predetermined value within a range of 0.2 mm to 2.0 mm. A heat sink characterized by:

7. The heat sink according to any one of claims 1 to 3, A heat sink characterized in that the width of the fins in one of the fin arrays is different from the width of the fins in another fin array arranged adjacent to the one fin array.

8. The heat sink according to any one of claims 1 to 3, A heat sink characterized in that the thickness of the fins in one of the fin arrays is different from the thickness of the fins in another fin array arranged adjacent to the one fin array.

9. The heat sink according to any one of claims 1 to 3, A heat sink characterized in that the pitch in one of the fin arrays is different from the pitch in another fin array arranged adjacent to the one fin array.

10. The heat sink according to claim 4, When the metal plate is made of a material containing aluminum, the surface of the fins is anodized.

11. The heat sink according to claim 4, A heat sink characterized in that the width of the fins in one of the fin arrays is different from the width of the fins in another fin array arranged adjacent to the one fin array.

12. The heat sink according to claim 4, A heat sink characterized in that the thickness of the fins in one of the fin arrays is different from the thickness of the fins in another fin array arranged adjacent to the one fin array.

13. The heat sink according to claim 4, A heat sink characterized in that the pitch in one of the fin arrays is different from the pitch in another fin array arranged adjacent to the one fin array.

14. The heat sink according to claim 6, A heat sink characterized in that the width of the fins in one of the fin arrays is different from the width of the fins in another fin array arranged adjacent to the one fin array.

15. The heat sink according to claim 6, A heat sink characterized in that the thickness of the fins in one of the fin arrays is different from the thickness of the fins in another fin array arranged adjacent to the one fin array.

16. The heat sink according to claim 6, A heat sink characterized in that the pitch in one of the fin arrays is different from the pitch in another fin array arranged adjacent to the one fin array.

Images