JP2008028193A - Mount body structure and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mount a fan without increasing the thickness of a casing as much as possible in a mount body structure provided for an electronic device such as a personal computer and the electronic device such as a personal computer comprising the mount body structure. <P>SOLUTION: A mount body structure 10 includes a printed wiring board 4, and a heating component 5 is mounted on the printed wiring board 4. In the printed wiring board 4, a driving component of a fan 6 for cooling the heating component 5 is integrally provided, and through-holes 8a, 8b and 8c are formed inside a pass area 4a that is passed when rotating the fan 6. Furthermore, in the mount body structure 10, the fan 6 is mounted so as to be driven by the driving component, and a case 7 housing the fan 6 is mounted on the printed wiring board 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mounting structure provided in an electronic device such as a personal computer and an electronic device such as a personal computer including the mounting structure.

  BACKGROUND Electronic devices such as personal computers are provided with a printed circuit board in which electronic components are mounted on a printed wiring board (also referred to as a printed board) having a wiring pattern formed on a resin substrate. Electronic components that generate relatively large heat (hereinafter also referred to as “heat generating components”) such as CPU, capacitors, control ICs, and power supply components are mounted on the printed circuit board. Fans are provided.

  Conventionally, for example, Patent Document 1 discloses a printed circuit board unit provided with such a fan. The printed circuit board unit includes a printed circuit board, a fan that rotates on the printed circuit board, and a fan cover that can accommodate the fan and includes a rotation shaft of the fan.

In the fan, a permanent magnet is attached to a rotating body that supports a plurality of blades, and an electric motor that rotates the fan is configured by the permanent magnet and a coil that is attached to a bearing of the rotating shaft.
JP 2005-268327 A

  2. Description of the Related Art Conventionally, in electronic devices, there is a need to reduce the size of a housing in which a printed circuit board is stored, so that the fan provided inside is also required to be reduced in size.

  Conventionally, however, the fan is attached to the printed circuit board by screwing a fan cover (also called a casing or case) to a stud or housing boss on the board. In order to secure the performance, it was necessary to secure a clearance (gap) above and below the fan with a thickness of about several millimeters (for example, about 2 to 2.5 mm). For this reason, mounting the fan together with the fan cover on the printed circuit board has been one of the obstacles to making the casing thinner.

  In order to solve this problem, there is an idea that a part of the printed circuit board is cut out in a size corresponding to the size of the fan cover, and the fan is mounted together with the fan cover in a space secured by the cutout. However, when the cutout is provided, the size of the printed circuit board is reduced by the cutout, and the size that can be used for mounting electronic components is reduced.

  Therefore, the present invention has been made to solve the above-described problems. In a mounting structure provided in an electronic device such as a personal computer and an electronic device such as a personal computer including the mounting structure, a fan is mounted. Another object of the present invention is to prevent the thickness of the casing from being increased as much as possible.

  In order to solve the above problems, a mounting structure according to the present invention includes a printed wiring board on which an electronic component is mounted, and a fan driving component for cooling the electronic component mounted on the printed wiring board. The drive component is provided integrally with the printed wiring board.

  Further, another mounting structure according to the present invention is mounted on a printed wiring board on which electronic components are mounted, a fan driving component for cooling the electronic components mounted on the printed wiring board, and the printed wiring board. It has a heat-generating component mounted on a different side from the drive component and a heat-dissipating member connected to the heat-generating component. The drive component is provided integrally with the printed wiring board, and the fan rotates on the printed wiring board. A through-hole portion or a notch portion is formed in a region facing a passing region that passes through, and the heat dissipation member is extended to the through-hole portion or the notch portion.

  Furthermore, an electronic device according to the present invention includes a printed circuit board on which an electronic component is mounted, and a driving component that drives a fan for cooling a heat generating component among the electronic components mounted on the printed circuit board. And the drive component is provided integrally with the printed circuit board.

  As described above in detail, according to the present invention, in a mounting structure provided in an electronic device such as a personal computer and an electronic device such as a personal computer provided with the mounting structure, even if a fan is mounted, The thickness can be prevented from increasing as much as possible.

  Embodiments of the present invention will be described below. In addition, the same code | symbol is used for the same element and the overlapping description is abbreviate | omitted.

(First embodiment)
FIG. 1 is a perspective view of a personal computer 10 having a mounting structure according to the first embodiment of the present invention as seen from the front side, and FIG. 2 is a perspective view as seen from the back side. In the present embodiment, a personal computer 30 as shown in FIGS. 1 and 2 will be described as an example of an electronic device provided with a mounting structure.

  A personal computer 30 shown in FIGS. 1 and 2 is a portable notebook type notebook computer having a main body housing 1 and a display unit 2 in which a liquid crystal display panel is incorporated.

  The main body housing 1 is provided with a keyboard 3 on the front side, and a mounting structure 10 to be described later is provided inside. As will be described in detail later, a large number of electronic components constituting a predetermined electronic circuit are mounted on the mounting structure 10.

  The main body housing 1 has an exhaust port 1a on the back side. Exhaust gas cf discharged from a fan 6 for cooling a heat generating component 5 described later is discharged from the exhaust port 1a.

  FIG. 3 is a cross-sectional view schematically showing the internal structure of the main body housing 1 with the mounting structure 10 as the center. Inside the main body housing 1, a mounting structure 10, a heat generating component 12, a fin 13 connected to the heat generating component 12 and a fan 14 for cooling the heat generating component 12 are provided.

  The mounting structure 10 includes a printed wiring board 4 on which a wiring pattern is formed on a resin substrate, and a heat generating component 5 such as a CPU and the like on an upper surface of the printed wiring board 4 (a surface closer to the keyboard 3). A fan 6 for cooling the heat generating component 5 and a case 7 for housing the fan 6 are mounted.

  In the mounting structure 10, various electronic components 11 a, 11 b, 11 c such as a capacitor, a coil, and a power supply IC and a heat generating component 12 are mounted on the lower surface of the printed wiring board 4.

  FIG. 4 is a plan view showing the printed wiring board and the cooling fan. As shown in FIG. 4, the printed wiring board 4 has a rotating shaft 4 a erected from the upper surface and a plurality of penetrating holes in an area outside the rotating shaft 4 a and facing a passage area 4 b described later. Holes 8 (through holes 8a, 8b, 8c) are formed. A coil and a control IC (not shown) for driving (rotating) the fan 6 are attached to the rotating shaft 4a. The passage area 4b means a circular area through which the blade 6a passes when the fan 6 rotates.

  The coil and the control IC are physically integrated with the printed wiring board 4 together with the rotating shaft 4a, and constitute a driving component in the present invention for driving the fan 6. The coil and the control IC constitute an electric motor (fan motor) that drives the fan 6 together with a permanent magnet 6c described later.

  The fan 6 includes a plurality of blades 6a, a cylindrical rotating body 6b that supports the blades 6a, and a permanent magnet 6c that is fixed to the inside of the rotating body 6b. It is a double-sided intake type that performs intake from both the upper and lower sides in the axial direction, that is, the vertical direction. And the fan 6 is mounted in the printed wiring board 4 by attaching the rotary body 6b to the rotating shaft 4a, as shown in FIG. At this time, the fan 6 is mounted so as to ensure an appropriate clearance between the upper surface inside 1 b of the main body housing 1. As shown in FIG. 3, the printed wiring board 4 and the main body housing 1 have a clearance of height h1.

  FIG. 6 is a schematic cross-sectional view of the mounting structure shown in FIG. FIG. 8 is a perspective view showing the case 7. The case 7 has a size capable of accommodating the fan 6 on the inside, and as shown in FIG. 8, an exhaust port 7a cut out at a part of the side surface is formed, and a plurality of intake holes 7b are formed on the upper surface. Has been. The case 7 is mounted on the printed wiring board 4 by screwing or the like to a stud or boss (not shown) formed on the printed wiring board 4. The case 7 is mounted on the printed wiring board 4 such that the exhaust port 7 a faces the heat generating component 5. In addition, the exhaust port 7a may be formed in a part of side surface which opposes the heat-emitting component 5, and may be formed so that all the side surfaces may be opened.

  Furthermore, as shown in FIG. 6, heat-radiating fins 9 can be connected to the heat-generating component 5.

  In the mounting structure 10 having the above-described configuration, the fan motor is actuated by energizing the coils constituting the fan motor to rotate the fan 6. Then, the intake air af from the back surface of the printed wiring board 4 is introduced into the case 7 through the through holes 8a, 8b, 8c (see FIG. 4), and the intake air af is exhausted together with the intake air bf from the intake hole 7b of the case 7. It is discharged from the exhaust port 7a as cf.

  Further, since the exhaust port 7 a faces the heat generating component 5, the exhaust cf discharged from the case 7 is guided to the heat generating component 5. The heat generated by the heat generating component 5 is directly deprived of the heat generated by the exhaust cf, and the warmed exhaust cf is discharged to the outside from the exhaust port 1a. Furthermore, as shown in FIG. 6, when the heat-radiating fin 9 is attached to the heat generating component 5, the exhaust cf takes heat from the fin 9 and is discharged to the outside through the exhaust port 1a.

  In this way, the personal computer 30 cools the heat generating component 5 by removing the generated heat from the heat generating component 5 and releasing it to the outside. In addition to the heat generating component 5, the heat generating component 12 is also mounted on the mounting structure 10, but the heat generating component 12 is cooled by a cooling fan 14 and a fin 13 that are different from the fan 6.

  As described above, the mounting structure 10 has the driving components (in this embodiment, the coil and the control IC) that are provided integrally with the printed wiring board 4. Therefore, even if the case 7 is not mounted, the fan 6 can be rotated, and the air blown by the rotation is sent around the fan 6 so that heat is generated from the mounted heat generating component 5 and other heat generating components. Can take away and cool them.

  Therefore, the mounting structure 10 can cool the heat generating component 5 even when the case 7 is not mounted. Therefore, even if the fan 6 is mounted on the printed wiring board 4, the case 7 is not mounted. Since the case 7 is not mounted, the thickness of the main body housing 1 can be eliminated.

  Of course, the case 7 can also be mounted like the mounting structure 10, but in that case, it is preferable to provide through holes 8 a, 8 b, 8 c in the printed wiring board 4. The through holes 8a, 8b, and 8c are provided in a region facing the passage region 4b in the printed wiring board 4. Accordingly, the case 7 is provided with the intake holes 7b, so that not only intake from the front side of the printed wiring board 4 but also intake from the back side of the printed wiring board 4 through the through holes 8a, 8b and 8c. Therefore, the clearance secured under the fan 6 can be reduced, and accordingly, the thickness of the main body housing 1 does not have to be increased.

  In particular, when the case 7 is mounted like the mounting structure 10, the flow of air sent out from the case 7 can be restricted. That is, the exhaust cf can be discharged from the exhaust port 7a of the case 7 and the exhaust cf can be prevented from being discharged in the direction without the exhaust port 7a. Therefore, the exhaust cf can be reliably guided to the heat generating component 5, and the heat generating component 5 can be efficiently cooled.

  The case 7 can also be mounted by changing the position of the exhaust port 7 a according to the heat generating component 5. Therefore, by changing the direction of the exhaust port 7a without changing the position of the fan motor, the electronic component to be cooled can be changed, and the heat generating component different from the heat generating component 5 can be cooled. Therefore, the mounting structure 10 has an increased degree of freedom when changing the cooling target.

  Further, the mounting structure 10 can also radiate heat by using a ground layer (not shown) in the printed wiring board 4.

  Further, since the case 7 is not provided with a driving component such as a coil, a harness (wiring cable and connector) is not required to mount the case 7, and therefore, wiring inside the main body housing 1 is simplified. You can also. The case 7 can be mounted on the printed wiring board 4 by screwing, soldering, inserting and fixing, and by doing so, a screw for mounting the case 7 is also unnecessary.

(Second Embodiment)
In the first embodiment, the heat generating component 5 and the fan 6 are mounted on the same side of the printed wiring board 4. However, the present invention can also be applied to a mounting structure 20 in which the heat generating component 15 and the fan 6 are mounted on different sides of the printed wiring board 4 as shown in FIGS. Here, FIG. 5 is a perspective view schematically showing the structure inside the main body housing 1 provided with the mounting structure 20, and FIG. 7 is a cross-sectional view seen from the direction of the arrow P shown in FIG. .

  The mounting structure 20 is different from the mounting structure 10 in that a heat generating component 15 is mounted on the lower surface of the printed wiring board 4 instead of the heat generating component 5, and the electronic components 11a and 11c are not mounted. The difference is that another electronic component (not shown) is mounted. Further, the mounting structure 20 includes a printed wiring board 4 having through holes 26a and 26b having different shapes from the through holes 8a, 8b and 8c, and a heat sink 17, heat pipe 18 and heat radiating fins 19 as heat radiating members. The point mounted on the lower surface of the wiring board 4, the point where the exhaust port 7a of the case 7 is disposed facing the exhaust port 1a, and the point where the heat generating component 12, the fin 13 and the cooling fan 14 are not mounted. And the others are the same.

  The heat sink 17 is connected to the heat generating component 15 and is formed in a rectangular shape having a size capable of covering the heat generating component 15. The heat pipe 18 has one end connected to the heat sink 17 and the other end connected to the radiating fin 19, and is formed in a shape that can transfer the heat of the heat sink 17 to the radiating fin 19. The radiating fins 19 have a plurality of plate-like bodies and are arranged so that each plate-like body overlaps (overlaps) the through-hole 26b. The through holes 26a and 26b are formed across the inner side and the outer side of the passage region 4b.

  Even in the mounting structure 20 having the above-described configuration, the fan motor operates by rotating the coil constituting the fan motor and rotates the fan 6. Then, the intake air af from the back surface of the printed wiring board 4 is introduced into the case 7 through the through holes 26a and 26b, and the intake air af is discharged from the exhaust port 7a as the exhaust gas cf together with the intake air bf from the intake hole 7b.

However, in the case of the mounting structure 20, the heat generating component 15 is not directly deprived of heat by the blowing of the fan 6 but is cooled as follows.
Since the radiating fins 19 are formed so as to overlap the through holes 26b, the intake air af contacts the radiating fins 19 when passing through the through holes 26b. A heat pipe 18 is connected to the radiating fin 19, and a heat sink 17 is connected to the heat pipe 18. Therefore, the heat generated by the heat generating component 15 is transmitted to the heat radiating fin 19 through the heat sink 17 and the heat pipe 18.

  Then, when the intake air af passes through the through hole 26b, the heat dissipation fin 19 comes into contact with the heat dissipation fin 19 and takes heat from the heat dissipation fin 19, and is discharged from the exhaust port 7a as warmed exhaust cf. Thus, the heat generated by the heat generating component 15 is discharged to the outside, and the heat generating component 15 is cooled.

  This mounting structure 20 also has the same effects as the mounting structure 10. That is, the mounting structure 20 can also rotate the fan 6 even if the case 7 is not mounted, and send out the air blown by the rotation to the surroundings, thereby removing the heat from the heat-generating component 15 and warming the exhaust. cf can be discharged to the outside. Therefore, since the mounting structure 20 can also cool the heat generating component 15 even when the case 7 is not mounted, by not mounting the case 7, the thickness of the main housing 1 is not increased correspondingly. I can finish it. Other functions and effects are the same as those of the mounting structure 10.

(Modification)
FIG. 9 is a plan view showing a mounting structure provided with a printed wiring board 34 having a shape different from that of the printed wiring board 4, and FIG. 10 is a side view showing a part of the mounting structure.

  The printed wiring board 34 includes main boards 34a and 34b and a sub board 34c. Although not shown, a plurality of electronic components including a heat generating component such as a CPU are mounted on the main boards 34a and 34b. Further, as shown in FIG. 9, the main boards 34 a and 34 b are arranged with an interval S corresponding to the external dimension of the fan 6 (the interval S in FIG. 9 is somewhat larger than the external dimension of the fan 6). Yes.

  The sub-board 34c is integrally provided with a rotating shaft 4a and driving components similar to the printed wiring board 4. The sub board 34c is provided with rectangular through holes 34ca and 34cb. The sub-board 34c is disposed at a position between the main boards 34a and 34b at a predetermined distance from the main boards 34a and 34b along the thickness direction. The main board 34 a and the sub board 34 c are electrically connected by a connector 36.

  As shown in FIG. 10, a part of the fan 6 is mounted on the printed wiring board 34 so as to be fitted in a space secured between the main boards 34a and 34b.

  In this printed wiring board 34, the fan 6 is mounted by dropping a part thereof so as to be fitted in a space secured between the main boards 34a and 34b, so that the thickness of the main body housing 1 does not need to be increased. It is like that. Moreover, since the through holes 34ca and 34cb are provided in the sub-board 34c, it is not necessary to secure a clearance for intake under the fan 6, and the thickness of the main body housing 1 is increased accordingly. There is no need to increase it.

  FIG. 11 is a plan view showing another printed wiring board having a shape different from that of the printed wiring board shown in FIG. FIG. 12 is a side view of the same. FIG. 13 is a plan view showing still another printed wiring board. Like the printed wiring board 37 shown in FIGS. 11 and 12, one corner of the rectangular resin substrate is partially cut away (the broken line is cut off and removed), and a part of the notch passes. The rotation shaft 4a may be provided at a position that fits in the region 4b. In the printed wiring board 37, at least a part of the passage area 4 b is secured outside the printed wiring board 37. In the case of this printed wiring board 37, the corners are notched, but the size of the notch is smaller than that of the fan 6. Therefore, the size that can be used for mounting electronic components is not reduced as in the prior art. It has come to be finished.

  Furthermore, as in the printed wiring board 38 shown in FIG. 13, the fan 6 may be mounted by providing the rotating shaft 4a without cutting out the corners. In this way, it is not necessary to reduce the size that can be used for mounting electronic components. The printed wiring board 38 also has at least a part of the passage area 4b secured outside the printed wiring board 38.

  In the mounting structures 10 and 20, the through holes 8a, 8b and 8c or the through holes 26a and 26b are formed. However, a part or the whole of these through holes may be cut out.

  In the above embodiment, a notebook computer is described as an example of the electronic device, but the present invention can also be applied to an electronic device other than the notebook computer. Further, although a case where a double-sided intake type fan 6 is mounted has been described as an example, the present invention can also be applied to a case where a single-sided intake type fan is mounted.

  The above description is the description of the embodiment of the present invention, and does not limit the apparatus and method of the present invention, and various modifications can be easily implemented. In addition, an apparatus or method configured by appropriately combining components, functions, features, or method steps in each embodiment is also included in the present invention.

It is the perspective view which looked at the personal computer provided with the mounting structure in a 1st embodiment from the near side. Similarly, it is the perspective view which looked at the personal computer from the back side. It is sectional drawing which showed typically the internal structure of the main body housing centering on the mounting structure. It is a top view which shows a printed wiring board and a cooling fan. It is the perspective view which showed typically the structure inside the main body housing with which another mounting structure is provided. It is typical sectional drawing at the time of providing a fin in the mounting structure of FIG. It is sectional drawing typically shown centering on the internal structure of the main body housing provided with another mounting structure. It is a perspective view which shows a case. It is a top view which shows the printed wiring board and fan from which a shape differs from the printed wiring board shown in FIG. Similarly, it is the side view which showed a part in the section. It is a top view which shows another printed wiring board from which a printed wiring board shown in FIG. 3 differs in shape. Similarly, it is a side view. It is a top view which shows another printed wiring board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main body housing, 4, 34, 37, 38 ... Printed wiring board, 4a ... Rotating shaft 4b ... Passing region 5, 15 ... Heat-generating component, 6 ... Cooling fan, 7 ... Case 8a, 8b, 8c, 26a, 26b ... through holes 10, 20 ... mounting structure 17 ... heat sink, 18 ... heat pipe, 19 ... heat radiating fin 30 ... personal computer, 34a, 34b ... main board, 34c ... sub board

Claims (10)

A printed wiring board on which electronic components are mounted;
A fan driving component for cooling an electronic component mounted on the printed wiring board;
The mounting structure is characterized in that the driving component is provided integrally with the printed wiring board.   The mounting structure according to claim 1, wherein the printed wiring board has a through-hole portion or a notch portion formed in a region facing a passing region through which the fan rotates. The printed wiring board includes first and second main boards on which the electronic components are mounted, and a sub board on which the driving parts are integrally provided,
The first and second main boards are arranged at an interval corresponding to the outer dimensions of the fan, and are more than the first and second main boards between the first and second main boards. The mounting structure according to claim 1, wherein the sub-board is disposed at a predetermined distance in the thickness direction.   The driving component is provided at a corner portion of the printed wiring board, and at least a part of a passing area through which the fan rotates is secured outside the printed wiring board facing the passing area. The mounting structure according to claim 1 or 2. A heat generating component mounted on the same side as the drive component mounted on the printed wiring board;
A fan mounted on the printed wiring board to be driven by the driving component;
And a case having a size capable of accommodating the fan and formed with an exhaust port,
5. The mounting structure according to claim 1, wherein the case accommodates the fan, and the exhaust port is mounted on the printed wiring board so as to face the heat generating component. . A printed wiring board on which electronic components are mounted;
A fan driving component for cooling an electronic component mounted on the printed wiring board;
A heating component mounted on a different side from the driving component mounted on the printed wiring board;
A heat dissipation member connected to the heat generating component,
The drive component is provided integrally with the printed wiring board,
The printed wiring board has a through hole or a notch formed in a region facing a passing region through which the fan rotates.
The heat-dissipating member is extended to the through-hole portion or the cutout portion.   The said heat radiating member has a heat radiating fin, It is connected to the said heat-emitting component so that at least one part of this heat radiating fin may overlap with the said through-hole part or a notch part. Mounting structure. A fan attached to the printed wiring board to be driven by the drive component;
The mounting structure according to claim 6, further comprising a case that accommodates the fan and is mounted on the printed wiring board.   The fan has a rotating body, a permanent magnet is attached to the rotating body, and a fan motor that drives the fan is configured by the permanent magnet and the driving component. 8. The mounting structure according to 8. A mounting structure having a printed circuit board on which electronic components are mounted, and a driving component for driving a fan for cooling a heat-generating component among the electronic components mounted on the printed circuit board;
The electronic device according to claim 1, wherein the driving component is provided integrally with the printed circuit board.

Images