JP4269160B2 - Antenna structure of mobile terminal equipment - Google Patents

Description

  The present invention relates to an antenna structure of a mobile terminal device in which a wireless communication antenna cools a heat generating component on a printed circuit board in the mobile terminal device.

  In recent years, the functions of mobile terminal devices have been increasingly advanced, but as a result, many internal components have been incorporated, and many of the internal circuit components have become hot. In order to perform stable circuit operation, countermeasures against heat generation have become necessary, but due to restrictions on the internal structure of the main body, sufficient countermeasures against heat generation could not be taken. In addition, for the purpose of improving the design, an antenna that has been put in and out of a housing is often configured to be mounted inside the apparatus.

  Conventionally, it has been proposed to use an antenna as a heat sink for heat radiation of circuit components in a portable wireless device. Hereinafter, the structure of a portable wireless device using such an antenna as a heat sink will be described.

  FIG. 5 is a diagram showing a partial structure of a portable wireless device using an antenna as a heat sink described in Patent Document 1 below.

  In FIG. 5, a high-frequency power amplifier 51 that generates heat on a printed board 50 is fixed to an antenna shared filter 52 by means of an L-shaped fixing bracket 53 with silicon greases 54 and 55 interposed.

  FIG. 6 is a diagram showing a partial structure of a portable wireless device using an antenna as a heat sink described in Patent Document 2 below.

In FIG. 6, there is an antenna 62 and a power amplifier 61 connected to the printed circuit 60, and a mass 63 of the antenna 62 is thermally connected to a mass 64 of the power amplifier 61.
Japanese Utility Model Publication No. 1-160735 JP 2003-218729 A

  However, in the example disclosed in Patent Document 1, due to the interposition of silicon greases 54 and 55, the adhesion between the high frequency power amplifier 51 and the antenna shared filter 52 is improved, the heat conduction is made uniform, It is possible to secure insulation. However, a fixing part called an L-shaped fixing metal 53 is required.

  Further, in the example disclosed in Patent Document 2, the mass 63 of the antenna 62 and the mass 64 of the power amplifier 61 are not defined as materials that transmit heat. Therefore, if they are made of metal, the antenna 60 may be affected by characteristics.

  Therefore, the present invention secures electrical insulation between the antenna and the heat-generating component and minimizes the problem caused by heat generation in the antenna for wireless communication in the portable terminal device to alleviate the problem caused by heat generation of the component inside the housing. The purpose is to efficiently dissipate heat with limited parts.

In order to solve the above-described problem, the antenna structure of the mobile terminal device of the present invention is the antenna structure of the mobile terminal device in which the antenna for wireless communication also serves as a heat sink for cooling the heat-generating component on the printed circuit board. The heat-generating component is in contact with the heat conductor, which is a defective electric conductor, and is disposed across the printed circuit board housing portion of the equipment housing and the antenna housing portion forming a small chamber .

In the antenna structure of the portable terminal device of the present invention, the antenna has a structure having a wide effective area as the heat sink with respect to an external size when viewed in a plane .

  In the antenna structure of the mobile terminal device of the present invention, the antenna is characterized in that a portion disposed in the antenna housing portion has a waveform shape.

  Further, in the antenna structure of the mobile terminal device of the present invention, the antenna is characterized in that a portion arranged in the antenna housing portion is cut and raised.

  In the antenna structure of the portable terminal device of the present invention, a vent hole is provided in the antenna housing portion.

  In the antenna structure of the portable terminal device according to the present invention, the boundary between the printed board storage portion and the antenna storage portion of the device housing is a sealing structure.

  In the antenna structure of the portable terminal device of the present invention, the heat conductor is a structure in which an electromagnetic shielding material is sandwiched between two heat conductive materials.

  In the present invention, an antenna for performing wireless communication with a portable terminal device has a structure in which the antenna is brought into contact with a heat-generating component on a printed circuit board. As a result, it is possible to reduce the number of heat countermeasure parts in the terminal, reduce the number of parts of the device, and reduce the weight.

  Next, embodiments of the present invention will be described with reference to the drawings.

  In addition, the same symbol is attached | subjected to the same member in FIGS. 1-3.

  FIG. 1 is an external perspective view of a mobile terminal device to which the present invention is applied.

  FIG. 2 is a cross-sectional view of the internal structure of the mobile terminal device in the embodiment.

  The portable terminal device is connected to a main body 1 provided with an operation unit by a hinge 3 so as to be foldable, and includes a lid body 2 provided with a display unit. The antenna 5 of the present invention is hinged inside the main body 1 for wireless communication. It has a structure built in the 3 side.

  As shown in FIG. 2, the main body 1 of the mobile terminal device has a structure in which a printed circuit board 4 and an antenna 5 are wrapped with an upper housing 7 and a lower housing 6. The antenna 5 of the present invention is attached to the hinge 3 side of the lower housing 6, and the printed circuit board 4 inside the device has an antenna connection terminal 8, a heat generating component 9 that is a circuit component that generates heat, and a heat generating component 9. It has the structure which has the heat conductor 10 which conveys the heat of this to the antenna 5. As described above, the printed circuit board 4 and the antenna 5 are supported by the casing of the main body 1, and the heat conductor 10 is interposed between the facing surfaces of the heat generating component 9 and the antenna 5. The tip of the antenna 5 is in an antenna housing portion 12 in which a small chamber is formed in the vicinity of the hinge 3, and the entire antenna 5 is disposed across the printed circuit board housing portion 11 and the antenna housing portion 12 of the housing.

[Operation]
Next, the operation of the embodiment will be described.

  In the portable terminal device having the antenna structure of the present invention, the antenna 5 is attached to the lower casing 6 of the portable terminal device main body, and is electrically conducted by the antenna connection terminal 8 mounted on the printed board 4 inside the device. Yes. Further, the heat generated by the heat generating component 9 is transmitted to the antenna 5 by bringing the heat generating component 9 of the printed circuit board 4 and the antenna 5 into contact with each other through a heat conductor 10 such as a heat conductive rubber which is an electrically defective conductor. It dissipates heat by diffusing heat.

  By arranging the antenna 5 on the side of the hinge 3 where the user hardly touches the finger when operating the terminal, there is an effect that it is difficult to worry about the released heat. Further, by forming the antenna housing portion 12 in the small chamber, it is possible to prevent heat from being transmitted to the printed circuit board housing portion 11 side due to convection or radiation due to heat radiation at the tip of the antenna 5.

  Another embodiment of the present invention will be described.

  3 and 4 are cross-sectional views of the internal structure of the mobile terminal device according to another modification of the embodiment.

Although an example in which the flat antenna 5 is built in the hinge side is shown in FIG. 2, the antenna can have a structure having a large surface area with respect to mechanical strength and external size. In the example shown in FIG. 3, the antenna 5 has a waveform 13. The waveform 13 has a large section modulus in terms of material mechanics, a mechanical strength, and a surface area larger than the outer size. In the example shown in FIG. 4, the antenna 5 is cut and raised 14 (fin shape), and the surface area can be increased by cutting and raising. By adopting these shapes, the heat dissipation effect can be enhanced. Furthermore, by providing the slit hole 15 in the housing of the antenna housing portion 12, air permeability is imparted, and heat is released more efficiently. Note that the gap between the antenna 5 and the housing at the boundary between the printed circuit board storage unit 11 and the antenna storage unit 12 is closed with a packing 16 or the like to form a sealing structure, and even when moisture enters the slit hole 15 , Can be prevented.

  The relationship between the performance and shape of the antenna 5 will be further described. The performance of the antenna 5 depends on the volume rather than the shape because the electric capacity is important. The value becomes a discrete state (discrete), and cannot be slightly increased or decreased slightly. When making it larger, it becomes the next magnitude of the jump value. If the thickness is reduced, the area can be increased, but the thickness cannot be vibrated or easily deformed and the shape cannot be maintained. It differs depending on the material strength, although it differs depending on whether it is made of stainless steel or aluminum. It is. Therefore, it can be considered that there is no performance improvement effect even if the waveform or the cut and raised shape is used, but there is no degradation.

  The reason why the antenna 5 has the waveform 13 is that it can be stored in a limited space even if the material is made thinner than the flat shape and stretched on the assumption that the volume necessary for the antenna characteristics is maintained, and the section modulus is large. This is because the heat radiation performance can be improved by preventing the decrease in the mechanical strength and increasing the surface area by reducing the thickness.

  The reason why the antenna 5 is cut and raised is that the volume necessary for the antenna characteristics is maintained, the thickness is the same as that of the flat shape, the mechanical strength does not change much, and the surface area is increased by cutting and raising. This is because the heat dissipation performance can be improved.

  On the other hand, the antenna 5 is affected by conditions around the antenna mounting portion. In particular, when the antenna 5 is in contact with a device that generates noise such as a CPU or LSI, it is necessary to always take electromagnetic shielding (shield) against electromagnetic induction. A heat conductor 10 such as a heat conducting rubber interposed between the heat generating component 9 of the printed circuit board 4 and the antenna 5 is an electrically defective conductor and maintains electrical insulation, but in order to provide electromagnetic shielding, The heat conductor 10 may have a structure in which an electromagnetic shielding material such as a metal foil is sandwiched between two heat conductive materials.

External perspective view of portable terminal device to which the present invention is applied Sectional drawing of the internal structure of the portable terminal device in embodiment Sectional drawing of the internal structure of the portable terminal device in another modification Sectional drawing of the internal structure of the portable terminal device in another modification The figure which shows the one part structure of the portable radio which described in patent document 1 using the antenna as a heat sink The figure which shows the one part structure of the portable radio which described the patent document 2 using the antenna as a heat sink

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main body 2 ... Cover body 3 ... Hinge 4 ... Printed circuit board 5 ... Antenna 6 ... Lower housing 7 ... Upper housing 8 ... Antenna connection terminal 9 ... Heating component 10 ... Thermal conductor 11 ... Printed circuit board storage part 12 ... Antenna housing part 13 ... Waveform 14 ... Cut and raised shape 15 ... Slit hole 16 ... Packing

Claims (7)

In the antenna structure of a portable terminal device where the antenna for wireless communication also serves as a heat sink for cooling the heat generating components on the printed circuit board,
The antenna is in contact with the heat-generating component via a heat conductor that is an electrically defective conductor, and is disposed across an antenna housing portion that forms a printed circuit board housing portion and a small chamber of a device housing. An antenna structure of a portable terminal device. The antenna structure of the portable terminal device according to claim 1 , wherein the antenna has a structure in which an effective area as the heat sink is wide with respect to an outer size when seen in a plan view . The antenna structure of the mobile terminal device according to claim 2 , wherein a portion of the antenna disposed in the antenna housing portion has a waveform shape. The antenna structure of the portable terminal device according to claim 2 , wherein the antenna has a cut-and-raised shape at a portion arranged in the antenna housing portion. The antenna structure of the portable terminal device according to any one of claims 1 to 4 , wherein a vent hole is provided in the antenna housing portion. The antenna structure of the portable terminal device according to any one of claims 1 to 5 , wherein a boundary between the printed circuit board housing portion and the antenna housing portion of the device housing has a sealing structure. The antenna structure of the portable terminal device according to any one of claims 1 to 6 , wherein the heat conductor has a structure in which an electromagnetic shielding material is sandwiched between two heat conductive materials.

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