JP2000114760A - Cooling structure for electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic equipment cooling structure which have not so large cooling capacity but can realize a long life, low noise and miniaturization, by cooling a printed circuit board through a flow of air caused by vibration by a magnet of a thin plate-like member covering a board. SOLUTION: In the electronic equipment cooling structure, one or more electromagnets 19 are arranged at arbitrary locations according to a shape of a printed circuit board, a thin plate-like member 20 of magnetic material of magnetic material having permanent magnets 18 provided at positions facing the arranged electromagnets or a plate-like member made of magnetic material, is arranged nearly parallel to the printed circuit board so as to cover the board, so that control of magnetic field of the electromagnets causes vibration of the plate-like member, and a flow of air caused by a movement of the plate-like member causes cooling of the board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for an electronic device which is suitable for use in a relatively small electronic device formed of a single substrate.

[0002]

2. Description of the Related Art Fans are usually used to cool printed circuit boards mounted on relatively small electronic devices. Recently, high-density mounting of components on a printed circuit board has been performed, and cooling has become an important design stage in making electronic devices. FIG. 7 shows a conventional cooling structure for electronic equipment. In the figure,
(A) is an external view of the electronic device, (b) is a plan view when the housing is unpacked, and (c) is a cross-sectional view. Reference numeral 71 denotes a printed board on which a large number of electronic circuit components 74 are mounted. Reference numeral 75 denotes a housing frame which covers the printed circuit board 71 and has ventilation holes 76 and 77 at both ends for suction and exhaust. Numeral 72 denotes a cooling fan which generates air flow by rotating the wings, and moves the printed circuit board 7 from the intake hole 76 to the exhaust hole 77.
The heat generated by the component 74 mounted on the device 1 is released to the outside air.

Incidentally, reference numeral 73 denotes a power switch, 78 denotes a signal cable, and 79 denotes a connector.

[0004]

According to the above-described conventional cooling structure for electronic equipment, there are the following problems. (1) The printed board 51 has a plate shape, whereas the cooling fan 52 has a circular shape. Therefore,
In order to cool the printed circuit board 51 larger than the cooling fan 52, it is necessary to arrange a plurality of cooling fans 52 horizontally by the size of the printed circuit board 51. Although there are small cross-flow fans, there are limitations on the size and most of them do not fit. (2) The printed board 51 is plate-shaped and can be made relatively thin, but the cooling fan 52 needs to be rotated because the inclination of the fan blades to obtain rotation and wind flow needs to be rotated. It cannot be reduced in size.

(3) Since the cooling fan 52 rotates at high speed and friction occurs in the bearing portion, the cooling fan 52 has a wear life and needs to be replaced in a relatively short period of time. In particular, since the life of the electronic component 54 is shorter than that of the electronic component 54 mounted on the printed board 51, the cooling fan 52 needs to be replaced within the life of the device. If the cooling fan 52 is not replaced, it cannot be cooled by the life of the cooling fan 52, so that the life of the component due to heat is promoted. Therefore, the life of the electronic component 54 is determined by the life of the cooling fan 52.

(4) Since the cooling fan 52 rotates a plurality of blades, a relatively high-frequency noise is generated, and the cooling fan 52 cannot be installed in a quiet place.

The present invention has been made in view of the above circumstances, and the cooling capacity is not so large by cooling a printed circuit board by the flow of air generated by the vibration of a thin plate-shaped member covering a substrate by the vibration of a magnet. However, an object of the present invention is to provide a cooling structure of an electronic device that has a long life, low noise, and can be downsized.

[0008]

According to the present invention, there is provided a cooling structure for an electronic device, comprising:
The above electromagnet is arranged, and a permanent magnet is provided at a position facing the arranged electromagnet, or a thin plate member made of a magnetic material is arranged so as to cover the printed board at a position substantially parallel to the printed board. The plate member is vibrated by controlling the magnetic field of the electromagnet, and the printed circuit board is cooled by the flow of air generated by the movement of the plate member. In addition, an electromagnet is arranged substantially at the center of the printed board, and a permanent magnet is provided at a position facing the electromagnet, or a permanent magnet is formed of a magnetic material, and at least a part of the periphery is fixed to a box housing the printed board. A thin plate-like member formed of a material that can expand and contract with respect to the fixed portion is disposed so as to roughly cover the printed board, and the thin plate-like member vibrates by controlling the magnetic field by the electromagnet. It is also characterized in that the printed circuit board is cooled by the generated air flow.

Further, provided are at least two air holes provided around the box in which the printed circuit board is stored, one end of which is a fulcrum, one inside the box and the other outside the box. Air is sucked and exhausted by a valve movably attached to the printed circuit board, and the printed circuit board is cooled in cooperation with the flow of air generated by the vibration of the thin plate-shaped member. Also, an electromagnet is disposed at one end of the printed circuit board, and a permanent magnet is provided at a position facing the electromagnet, or a hinge is formed such that the pond end is rotatable around a part of the box as a fulcrum. It is also characterized by cooling the printed circuit board by the flow of air generated by the thin plate member vibrating through the hinge by controlling the magnetic field by the electromagnet, comprising a thin plate member attached through the hinge. Further, a hole is partially formed in the thin plate-shaped member, and the cooling of the partially high heat-generating component mounted on the printed board is enhanced by the airflow passing through the hole. The member is integrated with the device exterior member, and the exterior shape moves partially by controlling the magnetic field,
Alternatively, cooling is performed by inflow / outflow of air inside the apparatus by changing the outer shape.

Thus, it is possible to provide a cooling structure for an electronic device that has a long life, low noise, and can be downsized, though the cooling capacity is not so large.

[0011]

FIG. 1 is a diagram showing an embodiment of the present invention. In the figure, (a) is a state in which the device power is off,
(B) is a state in which the diaphragm starts operating after the power is turned on,
(C) shows a state where the diaphragm has dropped. In the figure, 1
Reference numeral 1 denotes a printed board on which a large number of electronic circuit components 54 are mounted. Reference numeral 15 denotes a housing frame for accommodating the printed circuit board, and has a ventilation port 17 for suction and exhaust at a position facing the side surface. Valves 22 and 23 having one end fixed and the other end rotatable are provided near the vent 17. The valve 22 is installed outside the housing frame 15, and the valve 23 is installed inside the housing frame 15, and is referred to as an exhaust valve 23 and an inflow valve 22, respectively, because of their roles.

The first feature of the present invention is that a diaphragm 20 is constituted by using an electromagnet 19 and a permanent magnet 18, and the flow of air generated by the vibration of the diaphragm 20 is replaced by the flow of air caused by rotation of a fan. I have. It is assumed that the electromagnet 19 is mounted in a square shape in accordance with a square-shaped printed board. In addition, a diaphragm 20 having an ice magnet 18 at a position facing the electromagnet 19 and having a size substantially equal to that of a printed circuit board is provided. With this configuration, a constant magnetic field is applied to the coil of the electromagnet 19 to generate, for example, an S-pole magnetic field on the surface. If a permanent magnet 18 having an S pole is disposed thereon, the permanent magnet 18 is repelled because it has the same polarity, and the movable permanent magnet 18 is separated from the electromagnet 19. Next, since the magnetic field of the electromagnet that cuts off the electricity of the electromagnet 19 disappears, the permanent magnet 18 falls by its own weight. By repeating this, an air flow due to the vibration of the diaphragm 20 is generated.

It is also possible to control the north and south poles of the surface by preparing two types of electromagnets 19 or changing the direction of electricity flowing to the electromagnets 19, and this repulsion and inquiries are promoted. Therefore, it is possible to move the diaphragm 20 more reliably and quickly. It is easy to imagine that this diaphragm has no frictional portion and thus has no wear, and has almost no life-span, thereby extending the life. This diaphragm 20 is arranged at the end or the center of the printed circuit board 11, and an air flow is generated inside the housing frame 15 that houses the printed circuit board by using an enlarged diaphragm to increase the air flow. I do.

FIG. 1A shows a state when the power supply of the device is 0FF. The diaphragm 20 is in contact with the printed board 11. FIG.
(B) shows a state in which the diaphragm 20 after the power supply has started operating. Since the electromagnet 19 generates a magnetic force and repels the permanent magnet 18, the diaphragm 20 moves upward accordingly.
At this time, the pressure between the vibration plate 20 and the printed board 11 becomes negative because the volume temporarily increases. Therefore, air flows in from outside air. The left side has an inflow valve 23 so that air can flow in, but the right side is provided with an outside valve to prevent outside air from flowing in. Therefore, there is no inflow of air from the discharge valve 22. FIG. 1C shows a state when the diaphragm 20 falls. By eliminating the magnetic force of the electromagnet 19,
The diaphragm 20 falls under its own weight. At this time, the printed board 11
Since the air volume between the diaphragm and the diaphragm 20 is reduced, the pressure is higher than that of the outside air. Therefore, the air is discharged to the outside. At this time, since the discharge prohibition valve 23 is provided in the left vent hole 17 and cannot be discharged, there is a dischargeable valve 22 on the right side. Therefore, diaphragm 2
By moving the internal air from left to right by the vertical movement of 0, an air flow is created inside the housing, the outside air is taken in and the air inside the housing is exhausted, and the printed circuit board 11 can be cooled. .

The electromagnet 19 is composed of a coil and an iron core. The coil may be formed by printed wiring on a coil mounted on a printed circuit board. An electromagnet is formed by mounting an iron bar at the center of the coil. It can be manufactured at low cost. Of course, the electromagnet 19 may be attached as it is. Although the mounting positions of the electromagnets 19 are square in the embodiment of the present invention, the number may be changed according to the shape of the printed board, such as a total of five squares and one central part, or three. Further, the material of the diaphragm 20 is not particularly limited. It is also possible to prevent the displacement of the diaphragm 20 by taking out pins from the printed board 11 and forming holes in the diaphragm 20 to prevent the displacement of the diaphragm 20. Further, in order to partially enhance the cooling, it is possible to partially enhance the air flow by forming a hole in the diaphragm 20 on the necessary component on the printed board 11.

2, 3, 4, 5, 6, 7, and 8 show another embodiment of the present invention. In the figure, the components denoted by the same reference numerals as those in FIG. 1 are the same as those in FIG. In the embodiment (a) shown in FIG. 2, a time when the diaphragm 20 moves upward is shown. However, since air flows in from a hole formed in the diaphragm 20, the wind speed partially increases. (B) shows the time when the diaphragm 20 descends. In this case, since the air escapes from the hole of the diaphragm 20, the peripheral speed increases. By doing so, the cooling capacity in the vicinity of the partially high heat generating component 25 can be increased. In the figure, arrows indicate the flow of air.

In the embodiment shown in FIG. 3, the electromagnet 19 is installed substantially at the center of the printed circuit board 11, and the diaphragm 20 is elastically supported to move up and down. In the figure, reference numeral 27 denotes an elastic body support. The embodiment shown in FIG.
9 is disposed at one end of the printed circuit board 11 and the other is supported by a rotatable hinge mechanism 28 to operate the diaphragm 20 to move air. FIGS. 5A and 5B
In the embodiment shown in FIG. 2, a part of the device is constituted by a bellows-like member 29 which can be contracted and extended, and the member 29 has a magnetic field so that the exterior comes close to or away from the printed circuit board due to a magnetic field, thereby increasing the volume. In other words, the inflow and outflow of air in the equipment are performed.

Further, in the embodiment shown in FIGS. 6A and 6B, a bellows-like member 2 capable of contracting and expanding a part of the device is provided.
9, this member 29 contracts and expands by the magnetic field,
The volume of the device changes, and as a result, cooling is performed by inflow and outflow of air.

As described above, the present invention (1) uses an electromagnet provided on a square of a printed circuit board and a diaphragm made of a thin member having a permanent magnet and simultaneously vibrating, and a casing generated by the movement of the diaphragm. The first feature is that the electronic components mounted on the printed circuit board are cooled by the movement of air in the body.
(2) A shape or material which is large enough to cover at least a part of the printed circuit board with a shaking plate composed of an electromagnet and a permanent magnet arranged substantially at the center of the printed circuit board and which can be expanded and contracted into a square support portion or a square support portion. A second method is to form a magnetic diaphragm by a thin plate-shaped member having the following, and to move the diaphragm in accordance with the vertical movement of the magnetic diaphragm to cause air to move in the printed circuit board to perform cooling. (3) A movable material (valve) is attached to the air holes provided around the printed circuit board storage box (if left and right <both ends are front and rear), one hole is inside and the other is By attaching the surface to the outside, the valve affixed inside allows only inflow, and the valve affixed to the outside allows only outflow so that the flow of intake and exhaust can be created, cooling and high temperature Squeezed air out of the box and then A third feature is that a mechanism for sucking in warm air is used to enhance the cooling effect. (4) A magnetic diaphragm is disposed at one end of a printed board, and a plate supported by a movable hinge structure is provided on the other side. A fourth feature is that the cooling device is connected to a magnetic diaphragm and vibrates the plate in accordance with the vibration of the magnetic diaphragm to generate a flow of air inside the box and cool the box.

According to the present invention, the cost can be reduced by reducing the number of parts compared with the conventional fan cooling with a simple configuration using the magnetic diaphragm and the diaphragm, and the life can be extended by eliminating the sliding portion. Can be planned. Further, a hole may be partially formed in the diaphragm, and an increase in the airflow passing through the hole may be used to enhance the cooling of a part of the printed circuit board which has a high heat generation. Further, the configuration in which a permanent magnet is not included may be used as a configuration in which the diaphragm itself is attracted to the electromagnet as a magnetic material.

[0021]

As described above, according to the present invention, one or more electromagnets are arranged at arbitrary positions on a printed circuit board according to the shape of the printed circuit board, and a permanent magnet or a magnetic A thin plate-shaped member composed of a body is disposed so as to cover the printed board at a position substantially parallel to the printed board, and the plate-shaped member is vibrated by controlling the magnetic field of the electromagnet, thereby moving the plate-shaped member. The cooling of the printed circuit board is performed by the flow of air generated by the above, and therefore, a cooling structure of an electronic device which has a long life, low noise, and can be downsized can be provided although the cooling capacity is not so large.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention;

FIG. 2 is a diagram showing another embodiment of the present invention;

FIG. 3 is a view showing still another embodiment of the present invention;

FIG. 4 is a view showing still another embodiment of the present invention;

FIG. 5 is a view showing still another embodiment of the present invention;

FIG. 6 is a view showing still another embodiment of the present invention;

FIG. 7 is a diagram showing a cooling structure of a conventional electronic device.

[Explanation of symbols]

11 ... Printed circuit board, 4 ... Electronic components, 5 ... Housing frame, 1
6 (17): vent, 18: permanent magnet, 19: electromagnet,
Reference numeral 20: diaphragm, 22: exhaust valve, 23: inflow valve, 25: high heat-generating component, 26: diaphragm hole, 27: elastic support portion, 28:
Hinge mechanism.

Claims (6)

[Claims] 1. A thin plate having one or more electromagnets arranged at arbitrary positions on a printed board according to the shape of the printed board, and having a permanent magnet at a position facing the arranged electromagnets or made of a magnetic material The plate-shaped member is arranged so as to cover the printed board at a position substantially parallel to the printed board, and the plate-shaped member is vibrated by controlling the magnetic field of the electromagnet, and the printed board is caused by the flow of air generated by the movement of the plate-shaped member. A cooling structure for an electronic device, comprising: 2. An electromagnet is disposed substantially at the center of a printed circuit board.
A permanent magnet is provided at a position facing the electromagnet, or a permanent magnet is formed of a magnetic material, and at least a part of the periphery is fixed to a box housing the printed circuit board, and is expandable and contractible with respect to the fixed portion. A thin plate member formed of a material is arranged so as to cover the general printed circuit board, and the printed circuit board is cooled by an air flow generated by the thin plate member vibrating by controlling the magnetic field by the electromagnet. Electronic equipment cooling structure characterized by the above-mentioned. 3. A box for accommodating a printed circuit board is provided corresponding to at least one air hole formed around the box, one end of which is a fulcrum, one inside the box, and the other inside the box. The air intake / exhaust is performed by a valve movably affixed to the outside, and the printed board is cooled in cooperation with an air flow generated by vibration of the thin plate-shaped member. 3. A cooling structure for an electronic device according to item 2. 4. An electromagnet is disposed at one end of a printed circuit board and has a permanent magnet at a position facing the electromagnet, or is constituted by a magnetic material, and the other end is rotatably hinged around a part of a box body as a fulcrum. The printed board is cooled by the flow of air generated by the vibration of the thin plate member through the hinge by controlling the magnetic field by the electromagnet. The cooling structure for an electronic device according to claim 3. 5. A thin plate-like member having a hole partially formed therein,
4. The cooling structure for an electronic device according to claim 3, wherein the cooling of the partially high-heat component mounted on the printed circuit board is enhanced by the airflow passing through the hole. 6. The plate-shaped member is integrated with an exterior member of the apparatus, and the exterior shape is partially moved by controlling a magnetic field, or is cooled by inflow / outflow of air inside the apparatus due to a change in the exterior shape. 2. The cooling structure for an electronic device according to claim 1, wherein: