JP2013041334A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device having a heat radiation unit which prevents dust from attaching to fins in order not to decrease heat radiation efficiency against heat from a heat generating component.SOLUTION: An electronic device includes: a housing 20a that accommodates electronic components including a heat generating component 24 that generates heat in operation; a radiator 35 that has plural fins 36 arranged with predetermined gaps therebetween so that principal surfaces thereof face one another and to which heat generated from the heat generating component is transmitted; and a fan 31 that blows cooling air from an air exit to the gaps between the plural fins of the radiator. The plural fins of the radiator include first fins 36A disposed at both ends in an arrangement direction and second fins 36B disposed at an intermediate part in the arrangement direction. The first fins are formed so as to have constant gaps between their end portions on a fan side and an end surface of the air exit on a radiator side throughout their length in a lengthwise direction thereof. The second fins are formed so as to have wider gaps between their end portions on the fan side and the end surface of the air exit on the radiator side in at least one of the end portions in a lengthwise direction thereof.

Description

  The present invention relates to an electronic device having a heat-generating component that generates heat during operation, for example, an electronic device such as a notebook computer having a CPU (Central Processing Unit) that is a heat-generating component, and in particular, heat from the heat-generating component is externally provided. The present invention relates to the structure of the heat radiation unit to be released.

  For example, in the case of a notebook personal computer which is an example of an electronic device, the amount of heat generated from a heat-generating component such as a CPU increases with the performance improvement. In addition, in the case of a notebook computer that is a portable electronic device, there is a demand for downsizing and weight reduction as a portable electronic device, so various electronic components are packed inside a narrow housing, There is a need to provide a high-performance heat dissipation unit that can effectively release heat from the heat-generating component to the outside of the housing.

  In order to meet such a demand, a heat radiating unit including a heat radiating body having a heat radiating fin to which heat from a heat generating component is transmitted and a fan as a blowing means for sending cooling air into the heat radiating body is used. . In this conventional heat radiating unit, the heat generation component CPU is directly or indirectly contacted with a heat radiator by a heat pipe or the like to transmit the heat generation, and the heat of the heat generation component transmitted by the cooling air from the fan. Release to the outside of the housing is performed. In such a conventional heat dissipating unit, it is effective to increase the surface area of the fins of the heat dissipator in order to further improve the heat dissipating effect, and the fins are arranged through a narrow gap in a limited narrow space. Yes. However, if the fin formation interval is narrowed, fine dust contained in the cooling air supplied by the fan tends to adhere particularly to the side surface of the fin facing the fan. The dust adhering to the side surface of the fin tends to accumulate rapidly once it adheres, and the accumulated dust fills the gap between the fins and covers the entire surface on the side where the cooling air from the radiator fan flows. As a result, the cooling air from the fan cannot be sent into the gap between the fins, and the heat dissipation effect of the heat dissipation unit is significantly impaired.

  Thus, in order to prevent dust from accumulating on the side surfaces of the fins and impairing the heat dissipation effect of the heat dissipation unit, a heat dissipation unit including a brush that is a cleaning member for removing dust attached to the fins has been proposed. (See Patent Document 1).

  FIG. 9 shows a schematic configuration of a heat dissipation unit described in Patent Document 1 and used in a conventional electronic device.

  The conventional heat radiating unit 100 includes a fan 131 that blows cooling air and a heat radiating body 136 having fins that do not appear in the figure. The cooling air from the fan 131 is discharged to the outside of the housing 120 through the gap between the fins formed on the heat radiator 136, so that the heat of the CPU (not shown), which is a heat generating component transmitted to the heat radiator 136, is generated. Released outside the body 120.

  At the end of the radiator 136 on the side where the fan 131 is disposed, a brush 133, which is a cleaning member that can rub off dust adhering to the fins of the radiator 136, and this brush 133 is indicated by an arrow 141 in the figure. And a rotating mechanism 134 that moves in the direction.

  The conventional heat radiating unit 100 includes an operating body (not shown) that rotates the rotating mechanism 134, and is interlocked when the user pushes the operating body as necessary, or when the lid of the notebook computer is closed, for example. As a result, the brush 133 rotates in the direction of the arrow 141 to clean the side surfaces of the fins. At this time, the dust removed from between the fins by the brush 133 is discharged to the outside from the discharge port 121 formed in the housing 120 by the cooling air from the fan 131.

  Further, in the conventional heat radiating unit 100, an opening 135 is provided on the lower surface of the connection body 132 connecting the fan 131 and the heat radiating body 136, and dust removed by the brush 133 is removed from the opening 135 through the housing 120. Fall into the inside. The fallen dust passes through the inside of the housing 120 from the opening 135, which is a flow path different from the flow of the cooling air that is discharged to the outside of the housing 120 through the radiator 136. Is released to the outside of the housing 120 from the flow path connected to.

  Patent Document 1 discloses that dust attached to the fin by the brush 133 is removed using a motor that can be electrically controlled. Examples of the timing at which the brush 133 operates include a case where it is detected that the CPU is shut down, a case where the temperature of the CPU reaches a certain temperature, or a case where the usage time of the notebook computer reaches a certain time. ing.

JP 2008-306001A

  The conventional heat dissipation unit 100 of the electronic device includes a brush 133 that is a cleaning member that removes dust contained in the cooling air from the fan 131 attached to the fin, and can remove dust attached to the fin at a predetermined timing. It is possible to avoid a situation in which a large amount of dust accumulates on the fin and the cooling air is prevented from flowing.

  However, in the conventional heat radiating unit 100, it is assumed that the CPU, which is a heat-generating component, operates and cooling air is blown from the fan 131 as the timing for removing dust attached by the brush 133. In the conventional heat dissipating unit 100, the brush 133 has a shape that does not completely block the cooling air flow path in the heat dissipating body 136, and when the dust is removed, the cooling air does not flow and the heat dissipating effect is lost. Although it is prevented, the heat radiation efficiency is inevitably lowered due to the presence of the brush in the cooling air flow path. Further, in the conventional heat radiating unit 100, the brush 133 is used as a cooling air flow path when dust is removed, and as a flow path for discharging the dust removed by the brush 133 to the outside of the housing 120. An opening 135 is provided on the lower surface of the connection body 132 that connects the fan 131 and the heat dissipation body 136. However, since the opening 135 is provided, a part of the cooling air from the fan 131 cannot constantly pass through the radiator 136, and the cooling air from the fan 131 is completely discharged to the heat of the radiator 136. In other words, the heat dissipation efficiency is always reduced in that it cannot be used.

  Thus, in the conventional heat dissipation unit 100, since the cooling air from the fan 131 cannot be used effectively, it can be said that it can sufficiently cope with the recent high performance of notebook computers in which the CPU emits more heat. There wasn't.

  SUMMARY OF THE INVENTION The present invention solves the problems in the above-described conventional electronic device including a heat radiating unit, and does not include a cleaning member that removes dust adhering to the fin, and prevents the dust from adhering to the fin and generates heat. An object of the present invention is to obtain an electronic device including a heat radiating unit that does not lower the heat radiating efficiency of heat from the heat.

  In order to solve the above-described problems, an electronic device according to the present invention includes a housing in which an electronic component including a heat-generating component that generates heat during operation is housed, and a plurality of arrays arranged with a predetermined gap so that the main surfaces face each other. A heat dissipating body that transmits heat generated from the heat generating component, and a fan that blows cooling air from an exhaust port into a gap between the plurality of fins of the heat dissipating body, The fin includes a first fin disposed at both ends in the arrangement direction and a second fin disposed at an intermediate portion in the arrangement direction. The first fin has an end on the fan side, The second fin is formed such that the distance between the exhaust port and the end surface on the radiator side is constant over the entire length in the length direction, and the end on the fan side of the second fin is at least one end in the length direction. Part, the radiator side of the exhaust port Characterized in that it is formed so as to extend the distance between the surfaces.

  In the electronic device of the present invention, among the fins formed on the heat radiating body to which heat from the heat-generating component is transmitted, the end on the fan side of the second fin located at the center portion in the arrangement direction is in the length direction. At least one of the end portions of the fan is formed so that the gap between the exhaust port of the fan and the end surface on the side of the radiator is widened. Therefore, it is possible to obtain an electronic device in which dust contained in the cooling air from the fan does not easily adhere to the side surface of the fin facing the fan and the thermal efficiency does not decrease.

It is a perspective view which shows the example of schematic structure of the notebook computer concerning this embodiment. It is a disassembled perspective view which shows the main structures of the thermal radiation unit in the notebook computer concerning this embodiment. It is sectional drawing of the horizontal direction which shows the structure of the thermal radiation unit of the notebook computer concerning this embodiment. It is sectional drawing of the perpendicular direction which shows the structure of the thermal radiation unit of the notebook computer concerning this embodiment. It is a figure which shows the structure of the heat radiator in the heat radiating unit of the notebook computer concerning this embodiment. FIG. 5A is a perspective view of the heat radiating body as viewed from the side facing the fan, and FIG. 5B is a diagram showing the shape of the main surface of the fins arranged on the heat radiating body. It is a figure which shows the structure of the heat sink of another shape in the heat radiating unit of the notebook computer concerning this embodiment. FIG. 6A is a perspective view of another shape of the heat radiating body as viewed from the surface facing the fan, and FIG. 6B is a diagram showing the shape of the main surface of the fins arranged in the heat radiating body. is there. It is a figure which shows the structure of another heat radiator in the heat radiating unit of the notebook computer concerning this embodiment. FIG. 7A is a perspective view of still another heat radiating body as viewed from the side facing the fan, and FIG. 7B is a diagram showing the shape of the main surface of the fins arranged on the heat radiating body. . It is a figure which shows the structure of the heat radiator of the application example of the thermal radiation unit of the notebook computer concerning this embodiment. FIG. 8A is a perspective view of the heat radiating body of the application example as viewed from the side facing the fan, and FIG. 8B is a diagram showing the shape of the main surface of the fins arranged in the heat radiating body. . It is a figure explaining the structure of the conventional heat radiating unit.

  An electronic apparatus according to the present invention includes a housing in which an electronic component including a heat generating component that generates heat during operation is housed, and a plurality of fins arranged with a predetermined gap so that main surfaces thereof face each other. A heat radiator that transmits heat generated from the heat-generating component, and a fan that blows cooling air from an exhaust port in the gap between the plurality of fins of the heat radiator, the plurality of fins of the heat radiator being arranged in the arrangement direction A first fin disposed at both ends and a second fin disposed at an intermediate portion in the arrangement direction, and the first fin has an end on the fan side extending over the entire length in the length direction. An interval between the exhaust port and the end surface on the radiator side is constant, and the second fin has an end on the fan side at least at one end in the length direction. The space between the heat radiator side end surface of It is formed in.

  In the electronic device according to the present invention, the fins of the heat dissipating body to which heat of the heat generating component is transmitted are located at the end in the arrangement direction, and the end on the fan side extends over the entire length in the length direction. The second fin located at the center in the arrangement direction has a fan-side end at least in the length direction, and is formed so that the distance between the fan exhaust port and the radiator-side end surface is constant. At one end, the gap between the exhaust port and the end face on the radiator side is increased. With this configuration, the cooling air from the fan can be reliably supplied to the inside of the heat radiating body in which the fins are arranged, and the fin end shape is formed on the side surface of the fin facing the fan. The wind of the flow along the side is generated, and the dust contained in the cooling air from the fan becomes difficult to adhere. Therefore, it is possible to obtain an electronic device including a heat radiating unit that exhibits a stable heat radiating effect over a long period of time without using a means for removing dust attached to the side surface of the fin facing the fan.

  In the electronic device having the above-described configuration, the plurality of fins of the heat dissipating body have their main surfaces arranged along the vertical direction when the electronic device is in use, and the end of the second fin on the fan side is an electronic device. The lower part of the device in use is formed so that the gap between the exhaust port and the end face of the radiator is widened. By doing in this way, the flow of the downward wind arises in the edge part by the side of the fan of the 2nd fin, and the dust contained in the cooling wind from a fan can be discharged below the radiator.

  In addition, the fan-side end of the second fin is formed by an inclined surface in which the distance between the exhaust port and the heat-dissipator-side end surface gradually increases from the upper end to the lower end when the electronic device is in use. It is preferable. By doing in this way, adhesion of dust can be effectively prevented in the whole side surface facing the fan of the 2nd fin.

  Furthermore, the fan-side end portion of the second fin is configured by a curved surface in which the distance from the heat-dissipator-side end surface of the exhaust port gradually widens from the intermediate portion in the vertical direction in the use state of the electronic device to the lower end portion. This is what is being done. By doing in this way, it can prevent that a dust adheres to the side surface which opposes the fan of a fin, avoiding the reduction | decrease of the surface area of the main surface of a fin. Moreover, since the area of the upper part of a fin can be ensured, the heat pipe which transmits the heat from a heat generating member can also be arrange | positioned in the main surface of a fin.

  Furthermore, it is preferable that a plurality of the first fins are arranged at both ends in the arrangement direction. By doing in this way, a connection with a heat radiator and a fan can be performed more reliably, and it can avoid effectively that the cooling air from a fan escapes outside the heat radiator.

  Further, the second fin is shorter in the vertical direction in the use state of the electronic device than the first fin, and on the lower surface side of the radiator of the portion where the second fin is disposed, It is preferable that a cavity through which cooling air from the fan passes is formed. By doing in this way, it becomes possible to suck out the dust inside a heat radiator from the discharge port formed in the housing | casing.

(Embodiment of the Invention)
Hereinafter, as an embodiment of the present invention, a case where an electronic device is a notebook computer will be described as an example.

  FIG. 1 shows a notebook computer 1 as an electronic apparatus according to the present embodiment.

  In the notebook personal computer 1 according to the present embodiment, the lid 10 having a display device 12 such as a liquid crystal panel disposed on the inner surface is opposed to the main body 20 having an input device such as a keyboard 21 and a pointing device 22 disposed on the surface. The hinge mechanism 11 is rotatably attached.

  Inside the main unit 20, a secondary battery (not shown) that is an operating power source of the notebook computer 1, a hard disk drive (HDD) that is not shown that is a main recording device, and other electrical components are arranged. Note that the notebook computer 1 of this embodiment includes, for example, an antenna module for wireless LAN communication, a disk drive corresponding to a Blu-ray disc or a DVD disc, a web camera element, an audio microphone, a speaker, and other various input / output terminals. Although these functions and shapes are the same as those of a conventionally known notebook computer, illustration and detailed description are omitted.

  FIG. 2 is an exploded perspective view showing the internal configuration of the main body 20 of the notebook computer 1 according to the present embodiment. In FIG. 2, among various electronic components arranged inside the main body 20, the central processing element (CPU) 24, which is a representative heat-generating component having the highest temperature during operation, and the heat of the CPU 24 are transmitted to the main body 20. Only the vicinity of the heat radiating unit 30 discharged to the outside of the casing 20a constituting the outer shell is shown in an enlarged manner.

  As shown in FIG. 2, a CPU 24 is mounted on a circuit board 23 in a lower portion of a keyboard 21 disposed on the surface of the main body 20 of the notebook personal computer 1 of the present embodiment. On the upper surface of the CPU 24, a heat receiving portion 25 for transmitting heat generated when the CPU 24 operates to the heat radiating unit 30 is disposed. The heat receiving portion 25 is fixed by a fixing member 26 having spring-like legs so as to be pressed against the CPU 24 which is a heat source.

  A heat pipe 27 made of, for example, copper is connected to the heat receiving portion 25 to transmit the received heat to the heat radiating body 35 of the heat radiating unit 30. In the heat pipe 27, for example, a heat conductive medium such as alternative chlorofluorocarbon having high thermal conductivity is enclosed, and the heat of the CPU 24 transmitted to the heat receiving unit 25 is efficiently transmitted to the heat radiating body 35.

  In the notebook personal computer 1 of the present embodiment, as the heat radiating unit 30 for effectively releasing the heat of the CPU 24 to the outside of the housing 20 a of the main body 20, the heat radiating body 35 to which the heat from the CPU 24 is transmitted, and the heat radiating body 35. And a fan 31 arranged adjacent to the fan 31. Cooling air that the fan 31 sucks from the suction port 32 a formed on the upper surface of the fan case 32 and blows air is introduced into the heat radiating body 35, and the gaps between the fins 36 that are a plurality of plate-like bodies provided in the heat radiating body 35 are introduced. The heat radiation effect from the heat radiating body 35 is enhanced by being discharged to the outside of the housing 20a. A partition member 37 that divides the space inside the housing 20 a into a peripheral portion of the heat radiator 35 and a peripheral portion of the fan 31 is provided on the surface of the fan case 32 that is in contact with the heat radiator 35. It is arranged so as to surround it.

  3 and 4 are diagrams showing the configuration of the heat dissipation unit 30 in the notebook computer of this embodiment.

  FIG. 3 shows each member parallel to the main surface of the main body 20 of the notebook computer 1 on which the keyboard 21 is arranged in order to show the detailed structures of the fan 31 and the heat radiating body 35 constituting the heat radiating unit 30. The horizontal cross section of the state cut | disconnected by the center part of the height direction with the horizontal surface is shown. FIG. 4 is a vertical cross-sectional view showing the configuration of the heat radiating unit 30 by the cross-sectional shape of the rotating shaft 34 of the fan 31.

  FIG. 3 shows the shape of the portion along line B-B ′ in FIG. 4. FIG. 4 shows the shape of the portion along line A-A ′ in FIG. 3. Since the notebook computer 1 is usually used by placing the main body 20 so that the keyboard 21 is arranged in the horizontal direction, hereinafter, in this specification, the vertical direction in the usual use state is appropriately used. Each member will be described.

  As shown in FIGS. 3 and 4, the fan 31 is shown in FIG. 2 formed on the upper surface of the fan case 32 by rotating the blades 33 accommodated in the fan case 32 around the rotation shaft 34. Ambient air is taken in from the suction port 32a shown, and blown out as cooling air from the exhaust port 32b on the heat dissipating body 35 side. 3 and 4, the sirocco fan in which the blades 33 are configured with a number of forward blades is illustrated as the fan 31 of the present embodiment, but the overall shape of the fan 31, the position of the suction port 32a, The number and shape, the shape of the blade 33 that rotates around the rotation shaft 34, and the like are merely examples, and the fan 31 used in the heat dissipation unit 30 of the present embodiment sucks ambient air from the suction port and exhausts it. Any type of cooling fan (radiation fan) that has been used in the past can be used as long as it can be blown out.

  In the heat radiating unit 30 of the present embodiment, a heat radiating body 35 is disposed such that a side surface 35a on the fan 31 side is brought into contact with an exhaust port 32b provided in the fan case 32 of the fan 31. In other words, the end surface of the exhaust port 32b of the fan 31 on the side of the heat dissipating member 35 is regarded as the surface formed by the end of the frame that forms the outer shape of the exhaust port 32b of the fan 31. It is in contact with 35a.

  The heat radiating body 35 includes a plurality of fins 36 that are made of a metal such as copper having high thermal conductivity. In the heat dissipating body 35 of the heat dissipating unit 30 of the present embodiment, the fin 36 has a main surface, which is the surface having the largest area, arranged along the vertical direction in the usage state of the notebook computer 1 that is an electronic device. . More specifically, the fin 36 has a vertical direction that is a direction orthogonal to the arrangement surface of the keyboard 21 of the main body 20 of the notebook computer 1, that is, a vertical direction in the present specification that is also a vertical direction in FIG. The main surfaces of the fins 36 face each other through a predetermined gap so as to extend in the direction in which the cooling air from the fan 31 passes, that is, in the horizontal direction in FIGS. 3 and 4. It is arranged like that.

  In addition, a heat pipe 27 that transmits heat from the CPU 24 that is a heat generating component is disposed on the heat radiating body 35.

  In the heat dissipating body 35 in the heat dissipating unit 30 of the present embodiment, as a plurality of fins 36 arranged, the first fins 36A arranged at both ends in the arrangement direction and the second fins 36B arranged in the middle part in the arrangement direction. Are used.

  As shown in FIG. 3 and FIG. 4, the first fin 36 </ b> A arranged from the both end portions of the heat dissipating body 35 is the length of the side or surface formed by the end portion on the fan 31 side. The distance between the exhaust port 32b of the fan 31 and the end face on the radiator side is zero over the entire length in the direction, that is, the vertical direction. In other words, the end portion on the fan 31 side of the first fin 36 </ b> A constitutes the side surface 35 a on the fan 31 side of the heat dissipating body 35, and is in contact with the end surface on the heat dissipating body side of the exhaust port 32 b of the fan 31. Further, as shown in FIG. 4, the second fin 36B arranged at the middle portion in the arrangement direction has an end on the fan 31 side at the lower end which is one end in the length direction. It is formed so that the distance between the exhaust port 32b of the fan 31 and the end face on the side of the radiator is increased. In other words, the distance between the end portion of the second fin 36B on the fan 31 side and the end face of the exhaust port 32b of the fan 31 on the heat dissipating member side becomes wider from the upper end to the lower end of the second fin 36B. The side surface of the second fin 36B facing the fan 31 is an inclined surface formed continuously from the upper end to the lower end of the fin 36B. That is, the upper end portion of the end portion of the second fin 36B on the fan 31 side is in contact with the upper portion of the exhaust port 32b of the fan 31, but the gap 35c is formed between the lower end portion and the exhaust port 32b of the fan 31. Is formed. In FIG. 3, which is a horizontal sectional view of the central portion of the heat radiating unit 30 in the height direction, the gap 35 c between the exhaust port 32 b of the fan 31 and the end of the fin 36 B on the fan 31 side is in the arrangement direction of the fins 36. Appears as an opening having a longitudinal direction.

  The size of the radiator 35, particularly the width and height of the side surface 35 a facing the fan 31 are the same as the outer width and height of the exhaust port 32 b of the fan 31. In addition, the cooling air that has passed through the gaps between the fins 36 of the heat radiating body 35 corresponds to the outer shape of the side surface 35b of the heat radiating body 35 on the housing 20a side, and the discharge port 28 is formed in the housing 20a as a slit or a through hole. To the outside of the housing 20a.

  In the heat radiating unit 30 of the notebook personal computer 1 of the present embodiment, as shown in FIG. 4, a resin belt-like or fine so as to surround the surface of the fan case 32 adjacent to the heat radiating body 35 of the fan 31. A sponge-like partition member 37 in which various depletions are formed is arranged. By this partition member 37, the inside of the housing 20 a can be partitioned into a portion on the side where the radiator 35 is disposed and a portion on the side where the fan 31 is disposed, and from the gap 35 c between the fan 31 and the radiator 35. Dust that has fallen into the lower housing 20a or dust that has collided with the discharge port 28 of the housing 20a and has not been discharged to the outside of the housing 20a has moved to the vicinity of the fan 31. Thus, it is possible to effectively prevent the air from being sucked in again from the air inlet 32a and supplied to the radiator 35 by riding on the cooling air.

  Here, the configuration of the heat radiating body 35 used in the heat radiating unit 30 of the present embodiment will be described in detail with reference to FIG.

  FIG. 5A is a perspective view of the heat radiating body 35 of the heat radiating unit 30 of the present embodiment, and shows a state in which the heat radiating body 35 is viewed from the fan 31 side. FIG. 5B shows the shapes of the main surfaces of the first fins 36A and the second fins 36B used in the radiator 35. In FIG. 5B, the radiator 35 is viewed from the extending direction of the arrangement direction of the fins 36 so that the difference in shape between the first fins 36A and the second fins 36B and the mutual positional relationship can be seen. In this state, the second fin 36B indicated by the solid line is superimposed on the first fin 36A indicated by the two-dot chain line.

  As shown in FIG. 5 (a), the heat dissipating body 35 has a plurality of fins 36 arranged so that their main surfaces face each other with a predetermined gap therebetween. As described above, in the present embodiment, the fin 36 of the heat dissipating body 35 has its main surface arranged along the vertical direction in the state of use of the notebook computer 1. In addition, an upper member 35e that connects the upper ends of the plurality of fins 36 and a lower member 35f that connects the lower ends of the plurality of fins 36 are disposed.

  The first fins 36A arranged at the end of the fins 36 in the arrangement direction, that is, at the end of the side surface 35a facing the fan 31 of the heat dissipating body 35 in the horizontal direction, The shape of the side surface 35d in the arrangement direction of the fins 36 of the heat radiating body 35 is the same rectangular shape as the shape excluding the upper member 35e and the lower member 35f.

  For this reason, the fan 31 side ends Aa of the pair of first fins 36A located at the outermost ends in the arrangement direction of the fins 36, the upper member 35e, and the lower member 35f are the fans of the radiator 35. Thus, the outer shape of the side surface 35a on the side facing 31 is constituted. Further, the end portions 36 </ b> Aa on the fan 31 side of the first fins 36 </ b> A arranged at the end portions in the arrangement direction of the fins 36 form a side surface 35 a that faces the fan 31 of the radiator 35.

  The external shape of the side surface 35 a on the fan 31 side of the radiator 35 is the same as the shape of the opening of the exhaust port 32 b of the fan 31. By doing in this way, all the cooling winds from the fan 31 can be introduce | transduced into the inside of the thermal radiation body 35, and a thermal radiation effect can be maintained highly.

  On the other hand, the second fin 36B disposed in the center part in the arrangement direction of the fins 36, that is, the center part in the left-right direction on the fan-side side surface 35a of the radiator 35 has the end part 36Ba on the fan 31 side from the upper end to the lower end. An inclined surface that is continuously formed and faces downward is formed. Therefore, at the bottom of the side surface 35a facing the fan 31 of the heat radiating body 35, the length in the arrangement direction of the fins 36, which is the width of the portion where the second fins 36B are arranged as shown in FIG. An x gap 35c is formed. Note that the lower member 35f of the heat dissipating body 35 connects the fins 36 in accordance with the size of the lower end portion of the fins 36 arranged, so that the gap 35c portion is formed to be recessed on the fan 31 side.

  As shown in FIG. 5B, the main surface of the first fin 36 </ b> A arranged in the heat dissipating body 35 of the present embodiment extends from the side surface 35 d in the arrangement direction of the fins 36 of the heat dissipating member 35 from the upper member 35 e and It has the same rectangular shape as that of the portion excluding the lower member 35f. That is, the end portion 36Aa on the fan 31 side of the first fin 36A has a linear shape extending in the vertical direction. Thus, the end portion 36Aa on the fan 31 side of the first fin 36A comes into contact with the end face on the radiator side of the exhaust port 32b of the fan 31 (not shown in FIG. 5B). In addition, since the exhaust port 32b of the fan 31 in the heat dissipation unit 30 of the present embodiment is a horizontally long rectangular frame (a horizontally long rectangular shape) having a predetermined thickness on each side, Only the end portion 36Aa on the fan 31 side of the first fin 36A located on the outermost side contacts the side portion of the frame of the exhaust port 32b of the fan 31 over the entire length in the length direction of the end portion. However, since the end of the first fin 36A on the fan 31 side constitutes the fan-side side surface 35a of the radiator 35, the first fin 36A other than the fin 36A located on the outermost side in the arrangement direction is used. Also, the upper end portion and the lower end portion of the end portion 36Aa on the fan 31 side are in contact with the frame body of the exhaust port 32b. By doing in this way, when fixing the fan 31 and the heat radiator 35, it can adhere more firmly in a stable state.

  As shown in FIG. 5B, the main surface of the second fin 36 </ b> B of the radiator 35 is such that the lower portion of the end portion 36 </ b> Ba on the fan 31 side is in contact with the end surface of the exhaust port 32 b of the fan 32. It is formed as a continuous straight line from the upper end to the lower end so that the interval is widened. In other words, the side surface of the second fin 36B facing the fan 31 is an inclined surface formed continuously from the upper end to the lower end of the second fin 36B. Further, as shown in FIG. 5B, according to the comparison between the main surfaces of the first fin 36A and the second fin 36B, the main surface of the second fin 36B is the same as that of the first fin 36A. An end portion 36Ba on the fan 31 side with respect to the main surface is obliquely cut from the right corner of the upper side 36Bb in FIG. 5B in the second fin 36B over the substantially central portion of the lower side 36Bc. It has become. In other words, it can be said that the main surface of the second fin 36B has a trapezoidal shape in which the upper base (36Bb) having the hypotenuse (36Ba) on the fan 31 side is larger than the lower base (36Bc).

  As shown in FIG. 5B, the length y of the lower side 36 </ b> Bc of the portion notched from the main surface of the first fin 36 </ b> A on the main surface of the second fin 36 </ b> B is the fan 31 of the radiator 35. This constitutes the depth of the gap 35c provided at the bottom of the side. In other words, the gap 35c formed in the heat radiating body 35 can be said to have a width x and a depth y at the bottom surface portion of the heat radiating body 35.

  In this manner, the side of the second fin 36 </ b> B that faces the fan 31, which is disposed in the intermediate portion in the arrangement direction of the fins 36, is inclined obliquely downward, so that the side of the radiator 35 on the fan 31 side is inclined. The side surface 35a can be an inclined surface that extends obliquely downward. The side surface 35a is inclined to form a gap 35c having a width x at the bottom of the radiator 31 on the fan 31 side and a depth y. The gap 35c extends from the lower end side to the upper end side of the radiator 35. As you go, the size is getting smaller. In the heat dissipating body 35 of the heat dissipating unit 30 of the present embodiment, the end 36Ba on the fan 31 side of the second fin 36B is an inclined surface, so that the cooling air from the fan 31 strikes the side surface obliquely. Therefore, the dust that is included in the cooling air and blown to the radiator 35 is less likely to adhere to the side surface of the second fin 36 </ b> B that faces the fan 31. In addition, when the cooling air from the fan 31 hits the side surface of the second fin 36B on the side facing the fan 31, a flow of cooling air flows downward along the side surface of the second fin 36B. Even if the cooling air contains dust, it can be dropped downward from the gap 35c of the radiator 35.

  As a result, the heat radiating unit 30 according to the present embodiment has the shape of the heat radiating body even if a cleaning member for removing dust adhering to the fan side surface of the fin is not provided as in the conventional heat radiating unit shown in FIG. In particular, by devising the fin shape, dust can be prevented from accumulating on the side of the fin facing the fan, and the flow of cooling air is hindered by the dust accumulated on the fin, reducing the cooling effect. Can be effectively prevented.

  Next, another example of the shape of the heat radiating body used in the heat radiating unit 30 of this embodiment will be described with reference to the drawings.

  FIG. 6A is a perspective view of another shape of the heat radiating body 45 used in the heat radiating unit 30 of the present embodiment, and shows a state in which the heat radiating body 45 is viewed from the fan 31 side. 6B shows the shapes of the main surfaces of the first fins 46A and the second fins 46B used in the heat radiating body 45. FIG. As in FIG. 5B, also in FIG. 6B, the alternate long and two short dashes line so that the difference in shape between the first fins 46A and the second fins 46B and the arrangement relationship with each other become clear. A second fin 46B indicated by a solid line is superimposed on the first fin 46A indicated by.

  As shown in FIG. 6A, the heat radiating body 45 of another shape also has a plurality of fins 46 (46A, 46B) arranged so that their main surfaces face each other with a predetermined gap therebetween. Yes. Further, an upper member 45e that connects the upper ends of the plurality of fins 46 and a lower member 45f that connects the lower ends of the plurality of fins 46 are disposed.

  6A, in the heat radiator 45 having another shape, five pieces are provided at both ends in the arrangement direction of the fins 46, that is, at the left and right end portions of the side surface 45 a facing the fan 31 of the heat radiator 45. The first fins 46A arranged one by one, like the first fins 35A of the heat dissipating body 35 shown in FIG. 5A, have a main surface shape of the side surface 45d in the arrangement direction of the fins 46 of the heat dissipating body 45. The shape is the same rectangular shape as the shape excluding the upper member 45e and the lower member 45f.

  In the heat dissipating body 45 having a different shape shown in FIG. 6A, the second fins are arranged in the middle portion in the arrangement direction of the fins 46 and the central portion in the left-right direction on the side surface 45 a facing the fan 31 of the heat dissipating body 45. The shape of 46B is different from the shape of the second fin 36B in the heat dissipating body 35 shown in FIG.

  Specifically, as shown in FIG. 6B, the main surface of the second fin 46 </ b> B disposed in the heat radiating body 45 of the present embodiment has an end 46 </ b> Ba on the fan 31 side in the middle in the vertical direction. From the upper part to the lower end part, it is formed as a curve that widens the gap between the exhaust port 32b of the fan 32 and the end face on the radiator side. In other words, the shape of the end portion 46Ba on the fan 31 side of the second fin 46B is configured by a straight line portion from the upper end portion to the middle portion in the vertical direction of the second fin 46B and a curve from the middle portion in the vertical direction to the lower end. Has been. That is, as compared with the main surface shape of the first fin 46A, the second fin 46B is provided with a notch by a curve from the vertical middle portion to the lower end of the end portion 46Ba on the fan 31 side. The curved cutout portion of the end portion 46Ba on the fan 31 side constitutes the curved surface of the side surface of the second fin 46B that faces the fan 31.

  As described above, the end portion 46Ba on the fan 31 side of the second fin 46B arranged in the middle portion in the arrangement direction has a curved notch starting from the middle portion in the vertical direction, thereby dissipating another shape of heat. A curved surface directed obliquely downward can be formed on the side surface 45a of the body 46 facing the fan 31. And the side surface 45a which opposes the fan 31 of the heat radiating body 45 of the part in which the 2nd fin 46B is arrange | positioned is made into the curved surface which goes below, By the heat radiating body 45 and the exhaust port 32b of the fan 31 A gap 45c can be formed between the gap 45c and the dust blown to the radiator 45 included in the cooling air of the fan 31 from the gap 45c by the flow of the cooling air flowing downward along the side surface of the fin 46B. It can be dropped below the fin 45.

  As a result, in the radiator 45 which is another configuration example, similarly to the radiator 35 described above, without providing a cleaning member or the like for removing dust attached to the side surface facing the fan of the fin, In particular, by devising the shape of the fin, dust can be prevented from accumulating on the side of the fin facing the fan, and the flow of cooling air is hindered by the dust accumulated on the fin, reducing the cooling effect. Can be effectively prevented.

  6A, the end portion 46a on the fan 31 side of the main surface of the first fin 46A is also in contact with the end surface of the exhaust port 32b of the fan 31 on the heat radiator side end surface. Since it is linear so that the interval is constant, the side surface of the first fin 46 </ b> A that faces the fan 31 comes into contact with the end face of the exhaust port 32 b of the fan 31 on the radiator side. As a result, the fan 31 and the heat radiating body 45 can be firmly fixed, and all the cooling air from the fan 31 discharged from the exhaust port 32 b can be guided to the inside of the heat radiating body 45.

  Further, in the case of the heat radiating body 45 having another shape shown in FIG. 6A, the area of the main surface of the second heat radiating fin 46B is larger than that of the heat radiating body 35 shown in FIG. Reduction can be reduced. For this reason, compared with the heat radiator 35 shown to Fig.5 (a), the heat dissipation effect from the heat radiator 45 can be ensured more highly. Furthermore, in the case of the heat dissipating body 45 having another shape shown in FIG. 6A, the upper half of the second fin 46B is arranged in the arrangement direction of the fins 46 of the heat dissipating body 46 in the same manner as the first fin 46A. The shape of the side surface 45d is maintained as it is. For this reason, for example, a heat pipe for transmitting heat generated from the heat generating member can be arranged in the upper half portion of the fin 46 and can be directly connected to each fin 46. By doing in this way, since the fin 46 will be located in the whole surroundings of a heat pipe, the heat transfer from a heat pipe to the fin 46 can be performed more efficiently.

  Next, another example of the shape of the heat dissipator used in the heat dissipating unit 30 of this embodiment will be described with reference to the drawings.

  FIG. 7A is a perspective view of still another shape of the heat radiating body 55 used in the heat radiating unit 30 of the present embodiment, and shows a state in which the heat radiating body 55 is viewed from the fan 31 side. FIG. 7B shows the shapes of the main surfaces of the first fins 56A and the second fins 56B used in the radiator 55. 5B and 6B, in FIG. 7B, the second fin 56B indicated by the solid line is superimposed on the first fin 56A indicated by the two-dot chain line. Show.

  As shown in FIG. 7A, the heat radiator 55 having another shape also has a plurality of fins 56 (56A, 56B) arranged so that their main surfaces face each other with a predetermined gap therebetween. ing. Further, an upper member 55 f that connects the upper ends of the plurality of fins 56 is disposed. As will be described later, in the heat dissipating body 55 having another shape shown in FIG. 7A, the length of the fins 56 in the vertical direction is different, so the lower member connecting the lower end portions of the first fins 56A. 55g and the lower member 55h which connects the lower end part of the 2nd fin 56B are arrange | positioned.

  In the heat dissipating body 55 having another shape shown in FIG. 7A, the end of the fins 56 in the arrangement direction, that is, the end of the heat dissipating body 55 on the side surface 55a on the side facing the fan 31, The first fins 56A, each of which is arranged in five pieces, are the first fins 36A of the radiator 35 shown in FIG. 5A and the radiators 45 of another shape shown in FIG. As with the first fins 46A, the main surface shape is the same rectangular shape as the shape of the side surface 55d on the extension of the fins 56 in the arrangement direction of the heat radiating body 55 except the upper member 55f and the lower member 55g. ing.

  In the heat dissipating body 55 having another shape shown in FIG. 7A, the fins 56 are arranged in the middle of the arrangement direction of the fins 56, that is, in the central portion in the left-right direction of the side surface 55a facing the fan 31 of the heat dissipating body 55. The shape of the second fin 56B is the shape of the fin 36B in the radiator 35 shown in FIG. 5A, the shape of the second fin 46B in the radiator 45 of another shape shown in FIG. Is different.

  As shown in FIG. 7B, the second fin 56B disposed in the heat radiating body 55 having another shape is shorter in the vertical direction (vertical direction) than the first fin 56A. The bottom edge 56Bc of the lower end is located above the bottom edge 56Ab of the first fin 56A. The end portion 56Ba on the fan 31 side of the second fin 56B is formed by a linear notch formed from the end portion of the upper side 56Bb to the bottom side 56Bc that is the lower end.

  As shown in FIG. 7B, in the heat dissipating body 55 having another shape, the length of the second fin 56B in the vertical direction is short, so the bottom surface side of the portion where the second fin 56B is disposed. Further, a hollow portion 55e through which the cooling air from the fan 31 can pass is formed. As described above, the cavity 55e along the direction of the cooling air flow is formed on the bottom surface side of the radiator 55, so that the vacuum cleaner is in a state where the radiator unit 30 is disposed inside the housing 20a. For example, dust remaining in the radiator 55 can be sucked out from the discharge port 28 of the housing 20a. In addition, since the heat dissipating member 55 has a side surface facing the fan 31 formed by the end portion 56ba of the second fin 56B on the fan 31 side, the heat dissipating member 55 is inclined downward. Dust falls into the housing 20a, but since the cavity 55d is formed on the bottom surface side of the radiator 55, the dust that has fallen into the housing 20a can be efficiently discharged from the discharge port 28 of the housing 20a. It becomes possible to suck out.

  As described above, in the heat radiator 55 having another shape shown in FIG. 7A, the vertical length of the second fin 56B is shorter than the vertical length of the first fin 56A. A hollow portion 55 d is formed on the bottom surface side of the radiator 55. Further, on the main surface of the second fin 56B, the second end of the heat dissipating member 55 of still another shape in which the end portion 56Ba on the fan 31 side is formed by a linear notch that reaches the lower side 56Bc from the upper end portion. In the portion where the fins 56 </ b> B are disposed, the side surface 55 a facing the fan 31 can be inclined to the lower side, and dust contained in the cooling air from the fan 31 can be removed under the radiator 55. Can be dropped to the side.

  As a result, similar to the heat dissipating member 35 of the above-described embodiment and the heat dissipating member 45 of another shape, without providing a cleaning member or the like for removing dust attached to the side surface facing the fan of the fin, In particular, by devising the shape of the fin, dust can be prevented from accumulating on the side of the fin facing the fan, and the flow of cooling air is hindered by the dust accumulated on the fin, reducing the cooling effect. Can be effectively prevented.

  Further, since dust remaining in the radiator 55 can be sucked out from the discharge port 28 of the housing 20a by a vacuum cleaner or the like, dust adheres to the surface 55a of the radiator 55 facing the fan 31 or the gap between the fins 56. Even in this case, it can be removed to restore the heat dissipation effect and maintain a high heat dissipation effect.

  As described above, the heat radiating unit of the present embodiment has been described with illustrations including examples of different shapes of the heat radiating body. However, the above description is only an example of the heat radiating unit of the present embodiment, and the heat radiating of the present embodiment. The unit can take various forms other than those illustrated and described.

  For example, as the heat radiating body, the side surface has a rectangular shape and the heat pipe is connected to the upper surface as an example. However, the side surface shape of the heat radiating body is not limited to the rectangular shape, and is generally triangular or pentagonal as a whole. Or, a polygonal shape having six or more sides can be used. In addition, even if the side surface of the heat sink is rectangular as a whole in accordance with the shape of the space inside the housing in which the heat sink is arranged, at least some of the four corners are beveled in a chamfered shape. Or a shape connected by a curve. Furthermore, in the case where the heat pipe is disposed at a position penetrating the fin main surface, the heat pipe can be disposed in a curved hollow shape. And in the heat radiator having the side surfaces of various shapes, the distance between the fan-side end of the first fin disposed at both ends of the fin arrangement direction and the heat-dissipator-side end surface of the fan exhaust port is constant. In addition, the gap between the fan-side end of the second fin arranged at the intermediate portion in the arrangement direction and the heat-dissipator-side end surface of the fan exhaust port has a shape in which the lower part is widened. Cooling air from the fan can be efficiently supplied into the heat radiating body, and dust can be prevented from adhering to the side surface of the fin constituting the heat radiating body facing the fan.

  In the above-described embodiment, an example in which five first fins are arranged at both ends in the fin arrangement direction is shown. However, the first fin is at least the outermost end in the fin arrangement direction. It is only necessary to arrange one piece at a time, and two or more first fins can be arranged as appropriate. Further, it is not necessary to arrange the same number of first fins at both ends in the fin arrangement direction, and the number of first fins arranged at one end and the other end is different. It doesn't matter.

  Furthermore, in each said embodiment, although the 2nd fin showed the example arrange | positioned continuously in the intermediate part except the both ends of an arrangement direction, the 1st fin was arrange | positioned at the edge part of an arrangement direction, and arrangement | sequence As long as the second fins are arranged in the middle part of the direction, the second fins are not necessarily arranged continuously. For example, in the intermediate portion, the first fins and the second fins may be alternately arranged one by one or plural, or one to several first fins may be interposed between the second fins. May be arranged intermittently. Furthermore, the 3rd fin from which the main surface shape differs from the 1st fin and the 2nd fin may be arrange | positioned in the part in which the 2nd fin is arranged.

  Further, for example, when using a shape in which the lower side is curved and cut away from the intermediate portion in the vertical direction of the fan side end portion exemplified as the heat radiating body 46 of another configuration example as the second fin, the fan is arranged in the fin arrangement direction. The starting point of the side notch can be continuously changed. By doing in this way, the flow of the cooling air which collided with the side of the fin facing the fan becomes more complicated, and it may be possible to more effectively prevent the dust from adhering to the fin.

  In the above embodiment, the end portion on the fan side of the second fin, which is formed by an inclined surface continuously formed from the upper end to the lower end, is a curved surface from the intermediate portion in the vertical direction to the lower end in FIG. FIG. 6B shows the configuration constituted by the above, and FIG. 7B shows the configuration by the inclined surface formed from the upper end to the bottom side which is the lower end formed with a short vertical length. . However, the shape of the second fin is not limited to the shape exemplified above, and a configuration in which a part of the side constituting the end portion on the fan side is cut away from the main surface shape of the first fin. As the main surface shape of the second fin, a configuration is realized in which the lower portion has a larger gap than the upper portion between the fan-side end of the second fin and the heat-dissipator-side end surface of the fan exhaust port. be able to.

  For example, in the main surface of the second fin, a notch may be formed by a curve from the end on the fan side on the upper side toward the lower side, or from the middle point in the vertical direction of the end on the fan side to the lower side It is also possible to provide a straight notch toward. Moreover, the notch shape which combined the straight line and the curve can be used. Further, the gap between the heat-dissipator-side end face of the fan exhaust port and the side face of the fin facing the fan need not change so as to continuously decrease from the lower side toward the upper side. Any configuration may be used as long as the interval is larger than the upper interval. For example, in the intermediate portion between the lower side and the upper side, a portion on the fan side where the gap between the end portion on the fan side of the second fin and the end surface on the radiator side of the exhaust port of the fan is not changed is formed. It can also be set as the main surface shape in which the edge part comprises the step part.

  Furthermore, the main surface shape of the second fin does not need to be a shape in which a notch is formed on the fan side and the lower side based on the main surface shape of the first fin. The fan-side end is in contact with the heat-dissipator-side end surface of the exhaust port of the fan, and the upper-side portion is largely between the fan-side end portion of the second fin and the heat-dissipator-side end surface of the fan exhaust port. It is sufficient if a small gap is formed.

  Moreover, although the space | interval of the edge part by the side of the fan of 2nd fin and the heat sink side end surface of the exhaust port of a fan has been demonstrated, it has been demonstrated that the heat dissipation of this embodiment is carried out. The shape of the 2nd fin used for a unit is not restricted to this. For example, the main surface shape of the second fin can be formed so that the distance between the end on the fan side and the end surface on the radiator side of the exhaust port is widened at the upper end of the second fin.

  Further, for example, as in the heat radiating body 65 of the application example illustrated in FIG. 8A, the end portion on the fan side of the second fin 66 </ b> B forms inclined surfaces as indicated by 66 </ b> Bc and 66 </ b> Bd in FIG. 8. In addition, it can be formed so that the distance from the exhaust port of the fan is widened at both ends of the upper end portion and the lower end portion. 8, FIG. 8A is a perspective view of the heat radiating body 65 of the application example as viewed from the fan side, and FIG. 8B is the first fin, as in FIGS. 5, 6, and 7. In order to compare the shapes of 66A and the second fin 66B, they are shown in an overlapping manner.

  In the heat radiating body 65 of the application example, the first fin 66A has the same shape as each first fin of the heat radiating body shown in FIG. 5, FIG. 6, and FIG. 65 can be securely fixed. Further, since the upper end portion and the lower end portion of the fan-side end portion of the second fin 66B are spaced from the heat-dissipator-side end surface of the fan exhaust port, the upper member 65a and the lower side of the heat dissipator 65 are provided. The member 65b has a narrow central portion.

  Like the heat dissipating body 65 of the application example, the fan of the second fin 66B is formed by forming a gap between the upper end portion and the lower end portion of the second fin 66B between the heat dissipating member side end surface of the fan opening. The dust contained in the cooling air from the fan can be made difficult to adhere to the inclined surface 66Bc and the inclined surface 66Bd at the end on the side. As shown in FIG. 8B, the second fin 66B of the heat radiating body of the application example is such that the fan-side end 66Aa of the first fin 66A has an upper side 66Ba from one point 66Be in the middle portion in the vertical direction. Is formed in a pentagonal shape having an apex at one point 66Be in the intermediate portion by an oblique cutout toward the lower side 66Bb from one point 66Be in the middle portion in the vertical direction. However, the shape of the end of the second fin 66B on the fan side does not need to be formed by a notch starting from one point 66Be in the middle portion in the vertical direction, and the first fin 66A is located in the middle portion in the vertical direction. A straight portion that overlaps with the fan-side end portion 66Aa, and a notch formed as a whole toward the upper side 66Ba and the lower side 66Bb from both ends in the vertical direction of the straight portion may be a hexagonal shape. it can. Moreover, it can also be set as the shape cut out not in linear form but in curvilinear form.

  The application example shown in FIG. 8 or a shape in which a notch is provided in the upper portion of the second fin allows the fan-side end of the fin to face the upper side of the fin and the fan-side end and the fan. It is formed so that the space between the exhaust port and the heat sink side end surface is widened, and airflow is generated on the side facing the fan of the fin toward the upper side of the heat sink, so that the effect of blowing off dust is generated and the fin fan is opposed. It is possible to prevent dust from adhering to the side surface.

  Moreover, the heat radiator with which the main surface of the fin was arrange | positioned along the horizontal direction in the use condition of an electronic device can also be used as a heat radiator of another form. Also in this case, the first fins are arranged at both ends in the fin arrangement direction, that is, in the vertical direction in the usage state of the electronic device, and the second fins are arranged in the middle in the vertical direction. Then, the fan-side end of the first fin is formed so that the distance between the fan exhaust port and the radiator-side end surface is constant over the entire length in the longitudinal direction, and the fan-side end of the second fin This prevents the dust from adhering to the side surface of the fin on the fan side by forming the portion so that the distance between the exhaust port of the fan and the end surface on the radiator side is increased at least at one end in the length direction. An effect can be obtained.

  Further, in the above description, the case where the end face on the radiator side of the exhaust port of the fan abuts on the fan side surface of the radiator is described, but even if a predetermined gap is formed between the fan and the fin. Good. In this case, the fan-side end portion of the first fin is formed so that the distance between the exhaust port of the fan and the radiator-side end surface is literally constant over the entire length in the length direction. In other words, the case where the fan and the heat radiating body described above contact each other is a case where the distance between the fan-side end of the first fin and the heat radiating-side end surface of the fan exhaust port is constant at a size of zero. be able to. When a gap is formed between the fan and the radiator, a connecting member that covers the periphery of the gap between the exhaust port of the fan and the side surface of the radiator on the fan side is arranged to remove from the fan. Cooling air can be introduced into the radiator without waste.

  In the above description, the radiator side end face of the fan exhaust port is illustrated in the vertical direction in the usage state of the electronic device, but the radiator side end surface of the fan exhaust port is used for the electronic device. It can be set as the inclined surface which has a predetermined angle with respect to the up-down direction in a state. In this case, the radiator side end surface of the fan exhaust port and the fan side end surface of the radiator overlap with each other by inclining the fan side surface of the radiator corresponding to the inclination of the radiator end surface of the fan exhaust port. This is preferable from the viewpoint of efficiently using the cooling air from the fan. Furthermore, the end face of the fan exhaust port on the radiator side can be a curved surface that is at least partially curved, not a flat surface. In this case, the side surface on the fan side of the radiator is just mated with the curved surface. It can be made into such a shape.

  Further, in the above description, the example in which the upper member connecting the upper ends of the plurality of fins and the lower member connecting the lower ends is used as the radiator is shown. In the radiator of the radiator unit of the present embodiment, The upper member and the lower member are not essential. In addition, the outer shape of the exhaust port of the fan and the side surface shape of the radiator on the fan side do not necessarily have to coincide with each other.

  Furthermore, in the description of the present embodiment, the fin arrangement intervals of the heat dissipating body are shown to be equal in any part, but in the heat dissipating body used in the heat dissipating unit of the present embodiment, the gap between adjacent fins is The size is not limited to a uniform one.

  As described above, the notebook computer according to the present embodiment includes fins arranged so that the heat dissipating members disposed adjacent to the fans of the heat dissipating unit face each other with a predetermined gap therebetween. The end on the fan side of the first fin located at the end in the arrangement direction is formed so that the distance between the exhaust port of the fan and the end surface on the radiator side is constant over the entire length in the length direction, The end on the fan side of the second fin arranged in the intermediate part in the arrangement direction is formed so that the gap between the fan exhaust outlet and the heat radiator side end surface is widened at least in one end in the length direction. ing. For this reason, the cooling air of the fan can be supplied into the radiator without waste, and the dust contained in the cooling air can be prevented from adhering to the side surface of the fin facing the fan. Since high heat dissipation efficiency can be ensured over a long period of time, it is possible to sufficiently cope with an increase in the amount of heat generated from the heat-generating component due to an improvement in CPU performance.

  The electronic device according to the present embodiment has been described by exemplifying a laptop computer in which a lid having a display device disposed on the inner surface thereof is rotatably fixed to the main body. The electronic device of the invention is not limited to such a notebook personal computer, but includes various portable electronic devices such as a tablet personal computer, a mobile phone, a portable game machine, a small television receiver, a Blu-ray displayer, and a navigation system. It can also be used for various electronic devices such as desktop computers and liquid crystal projectors.

  In the above embodiment, the CPU is illustrated as a heat generating component that generates heat during operation. However, the heat generating component is not limited to the CPU, and a semiconductor chip for image processing such as a video board or a secondary battery, Various heat-generating components that should release the heat to the outside of the housing can be targeted.

  Furthermore, in the said embodiment, although the example which used the heat pipe was shown as a means to transmit the heat | fever from CPU to a heat radiator, a heat radiator is directly attached to CPU which is a heat-emitting component via a heat conductive adhesive. By fixing, the heat from the heat-generating component can be directly transmitted to the heat radiating body.

  The electronic device according to the present invention can introduce cooling air from the fan into the heat radiating unit as a heat radiating unit that discharges heat from the heat-generating components in the casing to the outside. Therefore, it can be applied to various applications as an electronic device having a high heat dissipation effect.

1 Notebook PC (electronic equipment)
20 Main Body 20a Housing 24 CPU (Heat Generation Component)
30 Heat Dissipation Unit 31 Fan 35 Heat Dissipator 36 Fin 36A First Fin 36B Second Fin

Claims (6)

A housing containing electronic components including heat-generating components that generate heat during operation;
A heat dissipating body to which heat generated from the heat generating component is transmitted, including a plurality of fins arranged via a predetermined gap so that the main surfaces face each other;
A fan that blows cooling air from an exhaust port in the gap between the plurality of fins of the radiator,
The plurality of fins of the radiator include a first fin disposed at both ends in the arrangement direction and a second fin disposed at an intermediate portion in the arrangement direction,
The first fin is formed so that the end on the fan side has a constant distance from the end surface on the heat radiator side of the exhaust port over the entire length in the length direction.
The second fin is characterized in that the fan-side end portion is formed so that a gap between the exhaust port and the heat-dissipating member-side end surface is widened at at least one end portion in the length direction. Electronic equipment. The plurality of fins of the heat dissipating body are arranged along the vertical direction in the use state of the electronic device of the main surface,
2. The electronic device according to claim 1, wherein an end portion of the second fin on the fan side is formed such that a lower portion of the second fin in an in-use state of the electronic device is widened with an end face of the exhaust port on the radiator side. machine.   The end on the fan side of the second fin is formed by an inclined surface in which an interval between the exhaust port and the end surface on the radiator side gradually increases from an upper end portion to a lower end portion when the electronic device is in use. 2. The electronic device according to 2.   The end of the second fin on the fan side is configured by a curved surface in which the distance between the exhaust port and the end surface on the radiator side gradually increases from the vertical middle portion to the lower end when the electronic device is in use. The electronic device according to claim 2.   The electronic device according to claim 1, wherein a plurality of the first fins are arranged at both ends in the arrangement direction.   The second fin is shorter in the vertical direction in the use state of the electronic device than the first fin, and the fan is disposed on the lower surface side of the radiator in the portion where the second fin is disposed. The electronic device in any one of Claims 2-5 in which the cavity part through which the cooling air from is passing is formed.

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