TWM529202U - A heat dissipating device - Google Patents

Abstract

The present invention is related to a heat dissipating device which connects with a heating surface of a heating unit. The heat dissipating device includes a plurality of first fin and a plurality of second fin. The first fin and the second fin are staggered in the heat dissipating device. Wherein, an area of the first fin is bigger than an area of the second fin. Compare the first fin with the second fin, the first fin includes a first non-overlapping area and a second non-overlapping area. The first non-overlapping area is located close to the heating surface and the second non-overlapping area is located far away from the heating surface for leading the way for outside air flowing in the heat dissipating device.

Description

Heat sink

This creation relates to a heat sink, and in particular to a fin type heat sink.

With the improvement of the performance of electronic products, various heat dissipation structures or heat sinks applied to electronic products are also booming. Among them, the conventional fin type heat sinks are mostly of the same size and arranged neatly, but their heat dissipation efficiency. Still proportional to the heat dissipation area of the fins, it does not meet the strict standards that the current heat sinks are moving toward lightweight development, but the heat dissipation efficiency is expected to be further improved.

Another conventional fin-shaped heat dissipating device, such as the Taiwan Patent No. M270414, which is invented by the inventor, sequentially arranges two fins of different sizes in a staggered manner to reduce the wind resistance of the air inlet. After that, the external airflow can be more easily entered into the heat sink, thereby improving the heat dissipation efficiency and reducing the overall weight. Although the above interlaced design has improved the shortcomings of the conventional fin type heat sink, the inventors have been concentrating on research and hope that under the original infrastructure, an updated improvement and design is proposed, so that the external airflow not only easily enters the heat sink, but also It is easier to be guided in the direction of the heat generating surface, and then the heat generated by the heat generating member is taken away. In addition, when the airflow passes through the heat sink, if it can be guided away from the heat sink in the direction away from the heat generating surface, the heat dissipation efficiency can be further improved.

One of the objects of the present invention is to allow the external airflow to easily enter the heat dissipating device and to be more easily guided in the direction of the heat generating surface, thereby more efficiently removing the heat generated by the heat generating member.

In addition, another object of the present invention is to allow the airflow to pass through the heat sink and be guided away from the heat sink in a direction away from the heat generating surface, so that the heat dissipation efficiency is further improved.

In order to achieve the above object, in a preferred embodiment, the heat sink is disposed on a heat generating surface of a heat generating component for receiving an external airflow into the heat sink to remove the heat generated by the heat generating component. The heat dissipating device includes: a bottom surface adjacent to the heat generating surface; a top surface away from the heat generating surface and disposed opposite to the bottom surface; and a plurality of first fins and second fins arranged at an interval along an axial direction Between the top surface and the bottom surface, and forming a plurality of air flow passages together with the top surface and the bottom surface, the air flow passage has an air inlet and an air outlet; wherein the first fin has an area larger than the second fin When the first fin is projected on the second fin along the axial direction, the first fin has a first non-overlapping area and a second non-overlapping area, and the first non-overlapping area is located in the a tuyere, wherein a width of the first non-overlapping area adjacent to the heat generating surface is greater than a width away from the heat generating surface, the second non-overlapping area is located at the air outlet, and a width of the second non-overlapping area adjacent to the heat generating surface is smaller than the distance The width of the heating surface.

In an embodiment of the present invention, the second fin and the first fin adjacent to both sides form a first recessed space at the air inlet, so that the external airflow passes through the first recessed space. The heat generating surface flows into the heat dissipating device, and the second fin and the first fin adjacent to the two sides form a second recessed space at the air outlet for passing the external airflow through the heat dissipating device At the time, the second recessed space flows out in a direction away from the heat generating surface.

In an embodiment of the present invention, the first fin and the second fin further include a flap to form the bottom surface and the top surface.

In an embodiment of the present invention, wherein the plurality of first fins are a rectangle, and the plurality of second fins are a parallelogram.

In an embodiment of the present invention, a heat pipe is disposed to be connected between the plurality of first fins and the plurality of second fins.

In an embodiment of the present invention, one end of the heat pipe is adjacent to the heat generating surface, and the other end is away from the heat generating surface.

In order to achieve the above object, in another preferred embodiment, a heat dissipating device is disposed on a heating surface of a heat generating component for receiving an external airflow into the heat dissipating device and carrying the heat generating component. The heat dissipating device includes a bottom surface adjacent to the heat generating surface; a top surface away from the heat generating surface and disposed opposite the bottom surface, the top surface and the bottom surface having a central cut surface, the central cut surface and the top surface The bottom surface has the same distance; and the plurality of first fins and the second fins are alternately arranged in an axial direction between the top surface and the bottom surface, and form a plurality of air flow channels together with the top surface and the bottom surface The air flow channel has an air inlet and an air outlet; wherein the first fin has an area larger than the second fin, and the first fin is projected on the second fin along the axial direction, the first a fin has a first non-overlapping area and a second non-overlapping area, the first non-overlapping area is located at the air inlet, the second non-overlapping area is located at the air outlet, the central section is the first non-overlapping area Divided into a first area and one a second area, the first area is adjacent to the bottom surface, the second area is adjacent to the top surface, the area of the first area is larger than the area of the second area, and the central section divides the second non-overlapping area into a third area And a fourth area adjacent to the bottom surface, the fourth area adjacent Near the top surface, the area of the third area is smaller than the area of the fourth area.

In another embodiment of the present invention, the second fin and the first fin adjacent to both sides form a first recessed space at the air inlet, so that the external airflow is caused by the first recess a space that flows into the heat dissipating device in the direction of the heat generating surface, and the second fin and the first fin adjacent to the two sides together form a second recessed space at the air outlet for passing the external airflow When the heat sink is disposed, the second recessed space flows out of the heat generating surface. In another embodiment of the present invention, the first fin and the second fin further include a flap to form the bottom surface and the top surface.

In another embodiment of the present invention, the plurality of first fins are a rectangle, and the plurality of second fins are a parallelogram.

In another embodiment of the present invention, a heat pipe is further disposed between the plurality of first fins and the plurality of second fins.

In another embodiment of the present invention, one end of the heat pipe is adjacent to the heat generating surface, and the other end is away from the heat generating surface.

10,20,30,40‧‧‧heating device

10a, 20a, 30a‧‧‧ top

10b, 20b, 30b‧‧‧ bottom

100,110‧‧‧Fold

41‧‧‧First fin set

42‧‧‧second fin set

210,220,230,241,242‧‧‧First fin

211,221,231,2411,2421‧‧‧First non-overlapping area

212,222,232,2412,2422‧‧‧Second non-overlapping area

310,320,330,341,342‧‧‧second fin

410‧‧‧heating parts

411‧‧‧Face

530‧‧‧heat pipe

S1‧‧‧First recessed space

S2‧‧‧Second recessed space

W‧‧‧External airflow

A3-A4‧‧‧ Diversion direction

AI11‧‧‧ first area

AI12‧‧‧Second area

AO11‧‧‧ third area

AO12‧‧‧ fourth area

WI21, WI31‧‧‧ first non-overlapping area adjacent to the first width of the heating surface

WI22, WI32‧‧‧ first non-overlapping area away from the second width of the heating surface

WO21, WO31‧‧‧ the second non-overlapping region is adjacent to the first width of the heat generating surface

WO22, WO32‧‧‧ second non-overlapping zone away from the second width of the heating surface

Fig. 1A is a perspective view showing a first embodiment of a heat sink device to which the basic inventive concept of the present invention is applied.

Fig. 1B is an exploded perspective view showing a part of the first embodiment of the heat sink shown in Fig. 1A.

1C is a first non-overlapping of the first embodiment of the heat sink shown in FIG. 1A A schematic diagram of the zone and the second non-overlapping zone.

1D is a schematic view showing the direction of external airflow guiding of the first embodiment of the heat sink shown in FIG. 1A.

Fig. 2A is a perspective view showing a second embodiment of a heat sink device to which the basic inventive concept of the present invention is applied.

Fig. 2B is an exploded perspective view showing a part of the embodiment of the heat sink shown in Fig. 2A.

2C is a schematic view of the first non-overlapping region and the second non-overlapping region of the second embodiment of the heat sink shown in FIG. 2A.

Fig. 3A is a perspective view showing a third embodiment in which a heat sink of the basic inventive concept of the present invention is applied and a heat pipe is added.

Fig. 3B is a perspective view showing a part of the implementation of the third embodiment of the heat sink shown in Fig. 3A.

3C is a schematic view of the first non-overlapping area and the second non-overlapping area of the third embodiment of the heat sink shown in FIG. 3A.

4A is a perspective view showing a fourth embodiment in which a heat dissipating fin set of the basic inventive concept of the present invention is applied to form a heat dissipating device.

4B is another schematic cross-sectional view of the fourth embodiment of the heat sink shown in FIG. 4A without the flaps.

First, please refer to the three-axis direction shown in the figures of the respective embodiments. Here, the X-axis direction is defined as the front and rear direction of the heat sink; the Y-axis direction is scattered. In the left and right direction of the heat device, the fins in the present case are arranged in a staggered arrangement to form the axial direction of the heat dissipating device; the Z axis direction is the upper and lower direction of the heat dissipating device, and in the present description, the heating element is relatively disposed in the case The lower part of the heat sink is conveniently explained, but it is not limited to this.

1A to 1C, FIG. 1A is a perspective view showing a first embodiment of a heat sink according to the present invention. Fig. 1B is an exploded perspective view showing a part of the first embodiment of the heat sink shown in Fig. 1A. 1C is a first non-overlapping region and a second non-first region of a heat dissipating device of FIG. 1A having a larger area when projected along a Y-axis to a second fin having a smaller area. Schematic diagram of the overlap area. FIG. 1D is a schematic diagram of how the external airflow is guided through the heat sink in the heat sink shown in FIG. 1A.

As shown in FIG. 1A to FIG. 1D, the heat sink 10 is coupled to the heat generating surface 411 of a heat generating component 410. The heat dissipating device 10 mainly includes a top surface 10a, a bottom surface 10b, a plurality of first fins 210, and a plurality of second fins 310. The bottom surface 10b is attached to the heat generating surface 411, and the top surface 10a is away from the heat generating surface 411 and the bottom surface 10b is opposite. Settings. The plurality of first fins 210 and the plurality of second fins 310 are arranged at a staggered interval between the top surface 10a and the bottom surface 10b along the Y-axis direction, wherein the staggered arrangement refers to the first fins 210 and The second fins 310 are sequentially disposed in the order of singular and even numbers, or vice versa in the order of even numbers and singular numbers. In addition, there is a gap (or gap) between the adjacent fins, which is achieved by the flaps 100 and 110 in the present case, but may be formed at a certain distance by other means such as bonding or welding. The interval is set in order. In addition, the plurality of flaps 100 can be abutted against each other to form a top surface 10a of the heat sink 10. The bottom surface 10b can also be made up of a plurality of flaps 110.

Referring to FIG. 1A to FIG. 1D, a plurality of first fins 210 and a plurality of second fins 310 are alternately arranged on the top surface 10a and the bottom surface 10b along the Y-axis. After that, a plurality of air flow passages C are formed together with the top surface 10a and the bottom surface 10b. The air flow passage C has an air inlet C1 for allowing external airflow to enter the heat sink 10 and an air outlet C2 for allowing the airflow to leave the heat sink 10. Further, there is a central section between the top surface 10a and the bottom surface 10b, and in the side view of Fig. 1C, the central section is indicated by L1.

Referring to FIG. 1A to FIG. 1D simultaneously, the first fin 210 provided in this embodiment has an area larger than the second fin 310. Therefore, when viewed from the side of the assembled heat dissipating device 10, the first When the fins 210 are projected on the second fins 310 along the Y-axis direction, the first fins 210 may include a first non-overlapping region 211 and a second non-overlapping region 212. The first non-overlapping region 211 and the second non-overlapping region 212 are actually the regions where the first fins 210 and the second fins 310 are more than the second fins 310 when the first fins 210 and the second fins 310 are overlapped. Or conversely, the second fin 310 is more constricted than the first fin 210, but since the retracted region is not the second fin 310 itself, it has a gap or a recess, but is staggered. The result of the comparison of the adjacent first fins 210 after completion, so the present description describes and defines in the description that the first fin 210 itself has an area that does not overlap with the second fin 310 when projected. I will first explain it here. One of the design rules proposed in the present invention is that the first non-overlapping area 211 is located at the air inlet C1, and the first non-overlapping area 211 is divided into a first area AI11 and a second area AI12 by the central section L1. Wherein the first area AI11 is adjacent to the bottom surface 10b, the second area AI12 is adjacent to the top surface 10a, and the area of the first area AI11 is larger than the area of the second area AI12; and the second non-overlapping area 212 is located at the air outlet C2, and is centered After the second non-overlapping region 212 is divided into a third region AO11 and a fourth region AO12, wherein the third region AO11 is adjacent to the bottom surface 10b, the fourth region AO12 is adjacent to the top surface 10a, and the area of the third region AO11 is smaller than The area of the fourth area AO12.

Please refer to FIG. 1A to FIG. 1D simultaneously, with the above design, second The fins 310 and the first fins 210 adjacent to the two sides form a first recessed space S1 at the air inlet C1, so that the external airflow W passes through the first recessed space S1 to the heat generating surface 411. The second fins 310 and the first fins 210 adjacent to the two sides also form a second recessed space S2 at the air outlet C2 for the external airflow to pass through the heat dissipation. When the device 10 is disposed, it flows out in a direction away from the heat generating surface 411 by the second recessed space S2, as shown in FIG. 1D.

In addition to the design rules provided by the first embodiment, the present invention also provides a second rule for designing non-overlapping regions, as well as a variety of fin retractions. Please refer to FIG. 2A to FIG. 2C. FIG. 2A is a perspective view of the second embodiment. Fig. 2B is an exploded perspective view showing a part of the embodiment of the heat sink shown in Fig. 2A. 2C is a first non-overlapping region and a first fin having a larger area in the heat dissipating device shown in FIG. 2A and projected on a second fin having a smaller area along the Y-axis. A schematic diagram of two non-overlapping regions.

The second embodiment illustrates the second design rule proposed in the present case by taking the first fin 220 as a rectangle and the second fin 320 as a parallelogram. 2A to 2C, the heat sink 20 of the second embodiment is connected to a heat generating surface 411 of a heat generating component 410. The heat sink 20 includes a top surface 20a, a bottom surface 20b, and a plurality of first fins. 220 and a plurality of second fins 320, wherein the bottom surface 20b is adjacent to the heat generating surface 411, and the top surface 20a is away from the heat generating surface 411 and disposed opposite to the bottom surface 20b. The plurality of first fins 220 and the second fins 320 are arranged at a staggered interval between the top surface 20a and the bottom surface 20b in the Y-axis direction, and form a plurality of air flow passages C together with the top surface 20a and the bottom surface 20b. The air flow passage C has an air inlet C1 and an air outlet C2. Another design rule proposed in this embodiment is that the first non-overlapping region 211 is located at the air inlet C1, and the width WI21 of the first non-overlapping region 221 adjacent to the heat generating surface 411 is greater than the width WI22 of the heat generating surface 411. And the second non-overlapping region 222 is located at the air outlet C2, and the second non-overlapping region 222 is adjacent to the hair The width WO21 of the hot face 411 is smaller than the width WO22 away from the heat generating face 411.

With the above design, the second fin 320 and the first fins 220 adjacent to the two sides together form a first recessed space S1 at the air inlet C1, so that the external airflow W is caused by the first recess The space S1 flows into the heat dissipating device 20 in the direction of the heat generating surface 411, and the second fin 320 and the first fins 220 adjacent to the two sides also form a second recessed space S2 at the air outlet C2. When the external airflow passes through the heat sink 20, it flows out in a direction away from the heat generating surface 411 by the second recessed space S2.

In addition to the above, the heat dissipating device of the basic inventive concept of the present invention may further add at least one heat pipe for improving the heat dissipating performance of the heat dissipating device in practical use. Referring to FIG. 3A to FIG. 3C, FIG. 3A is a perspective view showing a third embodiment of a heat dissipating device applying the basic inventive concept of the present invention and adding a heat pipe. Fig. 3B is a perspective view showing a part of the implementation of the third embodiment of the heat sink shown in Fig. 3A. 3C is a schematic view of the first non-overlapping area and the second non-overlapping area of the third embodiment of the heat sink shown in FIG. 3A.

In the third embodiment, the first fin 230 and the second fin 330 of the heat sink 30 relatively change the shape of the first fin 230 in response to the addition of the heat pipe 530. As shown in FIG. 3A to FIG. 3C, the heat sink 30 further includes a plurality of heat pipes 530, and the application of the plurality of heat pipes 530 is mainly that the heat pipes are respectively disposed at a higher temperature and a lower temperature, and the heat transfer phenomenon is The heat is transferred from a high temperature to a low temperature, thereby improving the heat dissipation performance. The application and path design of the heat pipe 530 can be combined and used by those skilled in the art after understanding the inventive spirit of the present invention, and will not be further described herein.

Specifically, in this example, although the heat sink 30 is provided with a plurality of heat pipes 530, the first non-overlapping region 231 and the second non-overlapping region 232 are not affected. The position is set, and it can be clearly seen from FIG. 3A to FIG. 3C that the first non-overlapping area 231 is shaped to improve the shape according to the heat pipe arrangement position, but the main area of the first non-overlapping area 231 is still mainly set to the first. The lower right side of the fin 230 and the main area of the second non-overlapping area 232 are still disposed on the upper left side of the first fin 230. As shown in FIG. 3C, as in the previous example, the first non-overlapping region 231 includes a first width WI31 and a second width WI32, and the second non-overlapping region 232 includes a first width WO31 and a second width WO32. In the first non-overlapping region 231, the first width WI31 adjacent to the heat generating surface 431 is greater than the second width WI32 away from the heat generating surface 431, and in the second non-overlapping region 222, the first width adjacent to the heat generating surface 431 WO31 is smaller than the second width WO32 away from the heat generating surface 431. As can be clearly seen, the opening of the first non-overlapping region 231 is gradually widened downward from the narrower portion above, and the opening of the second non-overlapping region 232 is gradually widened from the narrower portion below. Therefore, the flow direction A3 of the external airflow W flows in the same manner along the lower side of the first recessed space S1 of the heat sink 30, and takes away the heat energy of the bottom surface 30b of the heat sink 30, while the plurality of heat pipes 530 guide the heat energy from the high temperature. Conducted to a lower temperature. Next, the external airflow W brings the thermal energy in the heat sink 30 out of the second recessed space S2.

However, each of the above embodiments is a heat dissipating device 10-30 to which the basic inventive concept of the present invention is applied. However, in practical applications, the heat dissipating device of the present invention may further comprise a plurality of heat dissipating fin sets, and the following will be enumerated. The following fourth embodiment will be explained.

Please refer to FIG. 4A and FIG. 4B . FIG. 4A is a perspective view of a fourth embodiment of a heat dissipating device applying two sets of fins. FIG. 4B is another schematic cross-sectional view of the fourth embodiment of the application of the two sets of heat dissipation fin sets shown in FIG. 4A without the flaps. FIG. FIG. 4B is a diagram mainly illustrating an architecture in which the internal structures of two sets of heat dissipation fin sets are applied.

As shown in FIG. 4A and FIG. 4B, the heat sink 40 of this example differs from the previous example in that the first heat sink 40 includes a first fin set 41 and a second fin set 42. The first fin set 41 and the second fin set 42 are both extended applications of the spirit of the present invention. In this example, the second fin set 42 is added, and the overall heat dissipation area of the heat sink is equally increased. Next, the structural design of the first fin set 41 and the second fin set 42 will be described.

As can be seen from FIG. 4A and FIG. 4B , the first fin set 41 is formed by staggering the plurality of first fins 241 and the plurality of second fins 341 . The first fin 241 includes a first non-overlapping region 2411 and a second non-overlapping region 2412. The first fin group 41 is identical to the heat sink 20 of the second embodiment, as shown in FIG. 2A. The second fin set 42 is formed by staggering a plurality of first fins 242 and a plurality of second fins 342. The first fin 242 of the second fin set 42 identically includes a first non-overlapping area 2421 and a second non-overlapping area 2422, and the first non-overlapping area 2421 is similarly disposed on the first The lower right side of the fin 242 is disposed on the upper left side of the first fin 242. That is, the two sets of heat-dissipating fins 41, 42 are arranged to position the first non-overlapping regions 2411, 2421 and the second non-overlapping regions 2412, 2422 to conduct the flow of the external airflow W in the direction of the heat-dissipating fins 40. .

In particular, the two sets of fins 41, 42 used in the fourth embodiment can adjust the plurality of first fins 241, 242 and the staggered stack, in addition to the shapes of the first fins 241, 242. The number of the plurality of second fins 341, 342 is used to adjust the heat sink fin density of the heat dissipation fin sets 41, 42 in accordance with the heat dissipation requirement of the product.

For example, in the fourth embodiment, the sum of the number of the plurality of first fins 241 and the plurality of second fins 341 of the first fin group 41 may be 30-40, and the plural of the second fin group 42 The number of the first fin 242 and the plurality of second fins 342 The sum of the amounts can be 60-75 tablets. That is, in practical use, the heat dissipation fin density of the second fin set 42 may be greater than the first fin set 41.

Therefore, the present invention can effectively improve the heat dissipation performance of the overall heat dissipation device by using a plurality of sets of the heat dissipation fin sets of the present invention. Similarly, the heat pipe structure may be further added according to the inventive spirit of the fourth embodiment to improve the heat conduction efficiency in the heat dissipation fin group.

More clearly, the inventive concept of the present invention is to reduce the inlet pressure drop of the first recessed space of the heat sink and the outlet pressure drop of the second recessed space by adding two non-overlapping regions, which is advantageous for external airflow. It flows into the heat sink to increase the airflow speed and airflow of the external airflow, thereby increasing the heat dissipation coefficient of the heat sink. Furthermore, by increasing the airflow speed and airflow flow of the external airflow, a second fin set may be added to increase the heat dissipation area of the overall heat dissipation device, or a plurality of heat pipes may be added to the heat dissipation device to improve the heat conduction efficiency of the heat dissipation device. , thereby improving the overall heat dissipation efficiency. Further, the first non-overlapping area and the second non-overlapping area of the first fin are disposed in consideration of contact between the entire heat dissipating device and the heat generating surface, and the overall temperature of the heat dissipating device is higher than the air inlet of the air outlet. The first non-overlapping region is designed to be close to the heat generating surface in the first recessed space, and the second non-overlapping region is designed to be away from the heat generating surface in the second recessed space, in addition to helping the external airflow in the heat sink, and also in the high temperature The second recessed space retains the contact of the first fin and the second fin with the heat generating surface to help the overall heat dissipation.

In addition, the heat dissipating device provided by the present invention is connected to the heat generating surface of the heat generating component, and the heat dissipating device and the heat generating surface can be directly connected by close contact, or an additional heat conducting layer can be disposed between the two. Heated parts for indirect connection.

The above are only the preferred and feasible embodiments of this creation, and therefore, the scope of the patents of this creation is not limited to the scope of this creation, and the equivalent structural changes made by the use of this creation manual and the contents of the drawings are included in the scope of this creation. Bright.

10‧‧‧heating device

10a‧‧‧ top surface

100‧‧‧Fold

210‧‧‧First fin

310‧‧‧second fin

410‧‧‧heating parts

411‧‧‧Face

S1‧‧‧First recessed space

S2‧‧‧Second recessed space

Claims (12)

A heat dissipating device is connected to a heating surface of a heat generating component for receiving an external airflow into the heat dissipating device and carrying the heat energy generated by the heat generating component, the heat dissipating device comprising: a bottom surface adjacent to the heat generating surface; a top surface away from the heat generating surface and disposed opposite to the bottom surface; and a plurality of first fins and second fins arranged at an interval between the top surface and the bottom surface in an axial direction, and the top surface Forming a plurality of airflow channels together with the bottom surface, the airflow channel having an air inlet and an air outlet; wherein the first fin has a larger area than the second fin, and the first fin is projected along the axial direction In the second fin, the first fin has a first non-overlapping area and a second non-overlapping area, the first non-overlapping area is located at the air inlet, and the first non-overlapping area is adjacent to the heat generating surface. The width is greater than the width of the heat generating surface, the second non-overlapping area is located at the air outlet, and the width of the second non-overlapping area adjacent to the heat generating surface is smaller than the width of the heat generating surface. The heat dissipating device of claim 1, wherein the second fin and the first fin adjacent to both sides form a first recessed space at the air inlet, so that the external airflow is caused by The first recessed space flows into the heat dissipating device toward the heat generating surface, and the second fin and the first fin adjacent to both sides form a second recessed space at the air outlet for making the When the external airflow passes through the heat dissipating device, the second recessed space flows out in a direction away from the heat generating surface. The heat dissipating device of claim 1, wherein the first fin and the second fin further comprise a flap to form the bottom surface and the top surface. The heat dissipating device of claim 1, wherein the plurality of first fins are a rectangle, and the plurality of second fins are a parallelogram. The heat dissipating device of claim 1, further comprising a heat pipe extending between the plurality of first fins and the plurality of second fins. The heat dissipating device of claim 5, wherein one end of the heat pipe is adjacent to the heat generating surface, and the other end portion is away from the heat generating surface. A heat dissipating device is connected to a heating surface of a heat generating component for receiving an external airflow into the heat dissipating device and carrying the heat energy generated by the heat generating component, the heat dissipating device comprising: a bottom surface adjacent to the heat generating surface; a top surface, away from the heat generating surface and disposed opposite the bottom surface, the top surface and the bottom surface having a central cut surface, the central cut surface being the same distance from the top surface and the bottom surface; and a plurality of first fins and a second The fins are arranged at an interval between the top surface and the bottom surface, and form a plurality of air flow passages together with the top surface and the bottom surface, the air flow passage having an air inlet and an air outlet; wherein When the area of the first fin is larger than the second fin, and the first fin is projected on the second fin along the axial direction, the first fin has a first non-overlapping area and a second non- An overlapping area, the first non-overlapping area is located at the air inlet, and the second non-overlapping area is located at the air outlet, the central section dividing the first non-overlapping area into a first area and a second area, the first The area is adjacent to the bottom surface, the second Domain adjacent to the top surface, the area of the first region is greater than the area of the second region, the second section of the central region is divided into non-overlapping region a third region and a fourth region, the third region adjacent to the bottom surface, The fourth area is adjacent to the top surface, and the area of the third area is smaller than the area of the fourth area. The heat dissipating device of claim 7, wherein the second fin and the first fin adjacent to both sides form a first recessed space at the air inlet, so that the external airflow is caused by The first recessed space flows into the heat dissipating device toward the heat generating surface, and the second fin and the first fin adjacent to both sides form a second recessed space at the air outlet for making the When the external airflow passes through the heat dissipating device, the second recessed space flows out in a direction away from the heat generating surface. The heat dissipating device of claim 7, wherein the first fin and the second fin further comprise a flap to form the bottom surface and the top surface. The heat dissipating device of claim 7, wherein the plurality of first fins are a rectangle, and the plurality of second fins are a parallelogram. The heat dissipating device of claim 7, further comprising a heat pipe extending between the plurality of first fins and the plurality of second fins. The heat dissipating device of claim 11, wherein one end of the heat pipe is adjacent to the heat generating surface, and the other end portion is away from the heat generating surface.