JPH11155272A - Rotary driving gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power consumption, miniaturize a device, reduce weight, and manufacture the device with low costs, by providing a rotator at a recessed part on a substrate incorporated into an information processing device or the like, and the same time by arranging a coil being formed by patterning at the peripheral part of a recess. SOLUTION: A rotator 21 is provided at a recess 20 being provided on a substrate 1 incorporated into an information processing device or the like, and at the same time coils 4, 4', and 4" formed by patterning are arranged at the peripheral part of the recess 20. Although the number of coils 4, 4', 4"... used by rotary driving device 30 is not especially limited, it can be determined according to the size of the rotary driving device 30, required driving force, the shape of the rotator, and the like. Furthermore, the coils 4, 4', 4"... are constituted of wiring groups 5 and 6 being formed on both main surfaces of the substrate 1 by patterning, and a conductor in a via hole 7 that passes through the substrate 1 for forming.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drive device comprising a semiconductor device, and more particularly, to a rotary drive for rotating a fan or the like used for cooling an information processing device represented by a personal computer. The present invention relates to a driving device.

[0002]

2. Description of the Related Art Conventionally, cooling fans individually mounted on a housing or a board have been often used for cooling an information processing apparatus or the like which consumes a large amount of power and generates a large amount of heat. But,
Due to the recent trend of miniaturization and weight reduction of devices, it is difficult to secure a mounting space for a cooling fan.

Further, components that generate extreme heat are often mounted on a board in a concentrated manner, and a local cooling capability is required. However, there are few means capable of local cooling. For example, in Japanese Unexamined Patent Publication No. 2-269451, a circuit board is provided with a winged rotary shaft, and a flat stator is provided on a substrate near the rotary shaft.
There is described a technology in which a cooling fan is integrally formed on the surface of a substrate of an electronic device having a structure in which a magnet is provided facing the stator portion.

However, in such a conventional example, the cooling fan is large with respect to the thickness of the substrate, and therefore cannot be applied to an apparatus which is small and has a high mounting density like a portable personal computer. There was a disadvantage. Also, in JP-A-5-275876,
Similarly, a technique of forming a cooling fan on a substrate is described. However, the conventional example also has a problem that the fan itself is large and the number of parts increases due to the use of an ultrasonic motor.

[0005]

However, in recent years, information processing apparatuses typified by personal computers have been required to perform various arithmetic processing at higher speeds, and the power consumption has increased significantly and cooling is very difficult. It is becoming. further,
At the same time, the size and weight of the device are also required to be reduced, and the space for mounting members necessary for cooling is becoming increasingly limited.

[0006] Therefore, there is a demand for the development of a means for efficiently removing heat from a component generating a large amount of heat and cooling it without increasing the mounting volume in the information processing device or the like. Furthermore, among components mounted in the information processing device, when components with particularly high heat generation are concentrated,
The heat generated therefrom can concentrate on a portion of the device surface, creating local hot spots and giving the user discomfort.

Therefore, there is a need for a means for effectively removing heat from a local high-temperature part and moving it to another part. However, in the above-described conventional technology, a cooling fan or the like is configured using a substrate. Since it is large and uses ultrasonic waves, the configuration is complicated and the number of parts is increased, so that the cost is increased and there is no appropriate means for reducing power consumption, miniaturization, and weight reduction.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the above-mentioned disadvantages of the prior art and to provide a rotary drive device having a rotator which can be built in a substrate, and which has low power consumption, small size, and light weight. An object of the present invention is to provide a rotary drive device that can be produced at low cost.

[0009]

The present invention employs the following technical configuration to achieve the above object. That is, the rotation drive device according to the present invention is:
This is a rotary drive device in which a rotating body is provided in a concave portion provided in a substrate built in an information processing device or the like, and a coil portion formed by patterning is arranged around the concave portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The rotary drive device according to the present invention employs the above-described technical configuration. Therefore, a rotary drive body such as a motor is built in a circuit board itself in a built-in manner. It is also possible to embed a cooling fan or the like integrally in the substrate based on the rotary drive device.

In the rotary drive device according to the present invention, a magnetic field is generated by a coil formed on a substrate, and a rotary shaft made of magnetized metal is rotated. As an application, the fan is rotated by attaching a fan, a blade, or the like to the rotation shaft. More specifically, in the rotary drive device, a magnetic field is generated intermittently by applying a current intermittently to a coil-shaped circuit on a circuit board, and for example, a rotational motion is generated in a magnetized fan. Then, air is flowed to generate a cooling action.

The rotating shaft is made of a material having high thermal conductivity and is mounted so as to penetrate through the board, thereby removing heat from the electronic components mounted on the opposite surface of the board and being generated by rotation by a fan. It is also possible to discharge the air in the flow of air.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rotary driving device according to the present invention. That is, FIG.
FIG. 1 is a perspective view illustrating a configuration of a specific example of a rotary driving device according to the present invention, in which a rotating body 21 is provided in a concave portion 20 provided in a substrate 1 built in an information processing device and the like. A rotary drive device 30 in which coil portions 4, 4 ′, 4 ″ formed by patterning are arranged around the concave portion 20 is shown.

The number of the coil units 4, 4 ', 4 "... Used in the rotary driving device 30 according to the present invention is not particularly limited.
It can be appropriately determined according to the size of 0, the required driving force, the shape of the rotating body, and the like. Further, the coil unit 4,
4 ′, 4 ″... Are composed of wiring groups 5 and 6 formed by patterning on both main surfaces of the substrate 1 and conductors in via holes 7 formed through the substrate 1. Is what it is.

Further, the coil portion 4 according to the present invention,
4 ′, 4 ″... Indicate that the wiring groups 5 and 6 provided on both main surfaces of the substrate 1 and the conductors in the via holes 7 formed through the substrate 1 are appropriately connected in series. The wiring portions 5 and 6 and the via hole 6 and a method of embedding an appropriate conductive material in the via hole 6 are preferably formed by a conventionally known patterning method. Technology can be used.

The number of coils in the coil sections 4, 4 ', 4 "... Is not particularly limited, and can be determined as necessary in consideration of the above-described conditions.
Further, the rotating body 21 used in the present invention is shown in FIG.
As shown in (A), it is desirable that the rotating body 21 is formed of a magnetic material, and that the rotating body 21 is formed at a substantially central portion in the circular recess 20 of the circuit board 1. It is connected to the rotating shaft 2 via an appropriate means.

Alternatively, as shown in FIG. 2B, the rotating body 21 according to the present invention has the rotating shaft 2, and the rotating shaft 2 is provided within the circular recess 20. It may have a structure supported by the rotating shaft portion 23 which is an appropriate support member formed substantially at the center. Further, the rotating body 21 in the present invention may constitute an armature in a conventional motor structure.

As one specific example of the present invention, the rotating body 21 constitutes the fan 3. That is, as shown in FIG. 1, by attaching a plurality of fans 3 constituting appropriate wings to the periphery of the rotating body 21, for example, a cooling fan that can be used as a cooling device can be configured. .

Hereinafter, the rotary driving device 3 according to the present invention will be described.
A specific example at 0 will be described in detail with reference to FIGS. FIG. 1 shows a rotary drive 30 according to the invention.
FIG. 2 is a diagram illustrating a configuration of a circuit board embedded fan, which is one specific example, and is a perspective view in which a part of an exterior of the rotary drive device 30 is cut away.

The circuit board 1 is provided with a circular recess 20 in which a rotating shaft 2 is provided. A fan 3 made of, for example, a magnetic material is attached to the rotating shaft 2.
Is mounted rotatably. Further, a coil 4 for generating a magnetic field by a current is formed on the circuit board 1 by the above-described method using a conventional patterning technique.

By controlling the current flowing through the coil 4, a magnetic field is generated intermittently around the fan 3, and the fan 3 is rotated by the action of the magnetism of the fan 3 to reduce the flow of air. generate. The rotation speed and torque of the fan are controlled by turning on and off the current flowing through the coil 4 and the magnitude of the current value by the circuit board 1 or an appropriate control means 40 connected to the circuit board.

On the other hand, FIG. 2 shows a fan 3 of a substrate-embedded cooling fan which is a specific example of the rotary drive device according to the present invention.
2 is a cross-sectional view of the circuit board 1 in a state in which is removed. The circuit board 1 is provided with a rotating shaft 2 in advance,
The coil 4 is formed by serially connecting wiring portions 5 and 6 formed from one main surface of the substrate to the other main surface and a conductive member embedded in a via hole 7 formed vertically through the circuit board. And the coil portion 4 is formed in a spiral manner,
It is wired so that a current flows through the coil section.

FIG. 3 is an enlarged view of the coil 4 provided on the circuit board 1. The pattern 5 arranged on the circuit board 1 includes a spiral coil 4 that penetrates from one main surface to the other main surface of the circuit board 1 around the recess 20 in which the fan 3 is embedded. To form FIG.
2 shows an enlarged view of a rotating shaft 2 provided on a circuit board 1. FIG.

The rotating shaft 2 is arranged on the bottom surface of the concave portion 20 of the circuit board 1 and supports the center of the fan 3 so as to be rotatable. 5 and 6 are enlarged views showing an embodiment of the fan 3. FIG. FIG. 5 shows an example in which the fan 3 and the blades 8 constituting the fan 3 are formed by press working.

In the pressing stage, the blades 8 are twisted so that the air can be moved by the rotation. FIG. 6 shows an example in which the blade 8 is formed by etching. The thickness of the blades 8 is changed by the etching process, so that the air can be moved by rotation.

According to the etching process, an extremely fine shape can be formed. 7 and 8 are enlarged views showing details of the rotating shaft 2 and an embodiment of preventing the fan 3 from dropping off. In FIG. 7, the rotating shaft 2 is made of a member different from the substrate 1 and is mounted so as to penetrate the circuit board 1.

By using a metal having high thermal conductivity for at least a part of the material of the rotating shaft 2, it is possible to remove heat from components existing on the opposite surface of the circuit board 1. . Also, here, as an example, a method of plastically deforming the end of the rotating shaft 2 and providing the caulking portion 9 is shown to prevent the fan 3 from falling off.

FIG. 8 shows an example in which the rotating shaft 2 is formed as a part of the substrate 1. The rotary shaft 2 is formed on the circuit board 1 by cutting or the like. Here, in order to prevent the fan 3 from falling off, a retaining ring 1
2 is provided as an example. 9 to 11
Shows another application example of an embedded substrate fan according to the present invention to an actual device.

FIG. 9 shows an embodiment in which another board 9 different from the board 1 is mounted adjacently and a heating element 10 such as an electronic component is present on the surface thereof. In this case, it is desirable to mount the circuit board 1 in parallel with the other board 9 at a fixed distance, and to arrange the heating element 10 so that the cooling fan 3 faces. Furthermore, the circuit board 1 has a cooling port 1
Provision of the airflow device 1 causes a flow of air flowing through the circuit board 1, and the airflow can be applied to the heating element 10 to perform cooling.

FIG. 10 shows an embodiment in which an electronic component can be mounted without adhering to a substrate. That is, the heating element 10 is mounted so as to face the fan 3 of the circuit board 1, a gap is provided between the circuit board 1 and the heating element 10, and air can flow out.

Also in this case, the circuit board 1 is provided with the cooling port 1.
Provision of the air heater 1 makes it possible to create a flow of air flowing through the substrate 1 and to cool the heating element 10 intensively.
FIG. 11 shows that the circuit board 1 has a heating element 1 such as an electronic component.
An example in which 0 is in close contact is shown. In this case, the rotating shaft 2
Is formed of a material having high thermal conductivity and is mounted so as to penetrate the circuit board 1.

Then, the heating element 10 is disposed at a position facing the penetrating rotating shaft. The heat generated from the heating element 10 is transmitted through the rotating shaft 2 and further transmitted to the fan 3, and is radiated into the air by the rotation of the fan. That is, with this configuration, the flow of air flowing through the substrate 1 does not occur,
The fan 3 itself functions as a heat sink to promote heat transfer.

That is, in the rotary drive device 30 according to the present invention, it is preferable that at least a part of the rotary shaft portion is formed of a member having high thermal conductivity, and at least a portion of the substrate is provided. Part may be formed of a member having high thermal conductivity. It is also preferable that air circulation holes are provided in at least a part of the substrate.

Further, in the present invention, it is necessary to provide a rotation control means for intermittently supplying a current to the coil portion. As described above, the rotation drive device 30 according to the present invention is built in an information processing device or the like.
For example, a recess 2 provided in a circuit board, mainly a silicon substrate
A magnetic field is generated by a coil formed by using a wiring technique in a peripheral portion of the concave portion 20 in the circuit board, the magnetic member being rotatably mounted and magnetized. By rotating the body, for example,
The rotary drive device 30 that can be used as a motor can be configured, and as a specific application, it can be applied to a configuration such as a cooling fan.

[0035]

Since the rotary drive device according to the present invention employs the above-described configuration, the first effect obtained thereby is as follows:
It is possible to obtain a necessary rotary drive device without increasing the size of the device main body, and it is also possible to use it as a cooling fan.

The reason is that it is possible to embed a rotary drive device such as a cooling fan in a substrate. Further, a second effect of the present invention is that it becomes possible to disperse the heat with respect to local heat generation inside the device. The reason for this is that the cooling fan can be embedded in the board, which allows it to be placed in a place close to the heating element, allowing the heat to be immediately removed from the heating element without passing through other members. Because it became.

[Brief description of the drawings]

FIG. 1 is a perspective view in which a part of an exterior of a specific example in which a rotary drive device according to the present invention is applied to a substrate-embedded cooling fan is cut away.

2 (A) and 2 (B) are cross-sectional views of a substrate portion of the substrate-embedded cooling fan in FIG. 1;

FIG. 3 is an enlarged view of a coil that causes the embedded-substrate-type cooling fan to rotate in the specific example of FIG. 1;

FIG. 4 is an enlarged view of a rotating shaft of the substrate-embedded cooling fan in the specific example of FIG. 1;

FIG. 5 is an enlarged view showing a specific example of a fan used in a specific example of the rotary drive device according to the present invention.

FIG. 6 is an enlarged view showing a specific example of a fan used in another specific example of the rotary drive device according to the present invention.

FIG. 7 is a sectional view showing a specific example of a rotating shaft used in a specific example of the rotary drive device according to the present invention.

FIG. 8 is a sectional view showing a specific example of a rotating shaft used in another specific example of the rotary driving device according to the present invention.

FIG. 9 is a diagram showing an example of a structure of a rotating unit used in a specific example of the rotary drive device according to the present invention.

FIG. 10 is a diagram showing an example of a structure of a rotating unit used in another embodiment of the rotary drive device according to the present invention.

FIG. 11 is a diagram showing an example of the structure of a rotating unit used in another specific example of the rotary drive device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Circuit board 2 ... Rotating axis 3 ... Fan 4 ... Coil part 5, 6 ... Wiring pattern 7 ... Via hole 8 ... Blade 9 ... Caulking part 10 ... Heating element 11 ... Cooling port 12 ... Retaining ring 15 ... Other substrate 20 ... Concave part 21 ... Rotating body 23 ... Rotating shaft body part 30 ... Rotation driving device

Claims (11)

[Claims] 1. A rotating body is provided in a concave portion provided on a substrate built in an information processing device or the like, and a coil portion formed by patterning is arranged around a peripheral portion of the concave portion. Characteristic rotary drive. 2. The coil section is composed of a wiring group formed on both main surfaces of the substrate by patterning and a conductor in a via hole formed through the substrate. The rotary drive device according to claim 1, wherein: 3. The coil section is formed by connecting a group of wires provided on both main surfaces of the substrate and a conductor in a via hole formed through the substrate appropriately in series to form a spiral. 3. The rotary drive device according to claim 2, wherein a wiring portion is formed. 4. The rotation drive device according to claim 1, wherein the rotating body is made of a magnetic material. 5. The rotary drive device according to claim 1, wherein the rotating body constitutes a fan. 6. The rotary drive device according to claim 5, wherein said rotary drive device is a cooling device. 7. The rotary drive according to claim 1, wherein a rotary shaft portion that rotatably supports the rotary body is formed in a concave portion provided in the substrate. apparatus. 8. The rotary drive device according to claim 1, wherein at least a part of the rotary shaft portion is formed of a member having high thermal conductivity. 9. The rotation drive device according to claim 1, wherein at least a part of the substrate is formed of a member having high thermal conductivity. 10. A substrate according to claim 1, wherein air flow holes are provided in at least a part of said substrate.
A rotary drive device according to any one of the above. 11. The rotation drive device according to claim 1, further comprising: a rotation control unit that intermittently supplies a current to the coil unit.