JP2007180683A - Portable radio device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain excellent antenna characteristics while ensuring predetermined strength and achieving miniaturization. <P>SOLUTION: A portable radio device body has a laminate comprising a circuit board 13 on which a plurality of electronic components 18 are mounted, and a reference potential layer 19 is formed; a key substrate 15 provided with a key switch 22 for accepting an operation by a user; and a shielding member 14 provided with walls 21 erected on the reference potential layer 19, so as to surround each of two or more electronic components 18 from among the components 18 and a planar portion 20 for closing the opening of one of walls 21, and arranged between the circuit board 13 and the key substrate 15 to cover the electronic components 18 on the circuit board 13, and to support the key substrate 15. In this device, an antenna 16 for performing communication with a base station is arranged near the circuit board 13, the key substrate 15 and the shielding member 14. The wall 21 close to the antenna 16 is arranged so as to be positioned on the inside rather than the end of the planar portion 20 close to the antenna 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a portable wireless device such as a mobile phone having a built-in antenna and a PDA (Personal Digital Assistant).

In recent years, portable wireless devices such as mobile phones with built-in antennas and PDAs (Personal Digital Assistants) have been required to be smaller and lighter while the number of components has increased due to an increase in functions. In addition, since the design is also emphasized, the antenna that has been conventionally provided so as to protrude from the housing is miniaturized, and further, the antenna is built in the housing. For example, Patent Document 1 discloses a portable radio having a built-in antenna.
The portable wireless device disclosed in Patent Document 1 is a foldable type, that is, a first housing having a display unit and a second housing having an operation unit connected by a hinge unit. Such a configuration is intended to increase the size of the display unit and the operation unit while realizing size reduction in the folded state.
With such a configuration, it is necessary to reduce the thickness of each housing so that the folded portable wireless device does not become thick. However, since a predetermined strength must be ensured, the shape and arrangement of the components are devised so that a predetermined strength can be obtained as a whole by using the strength of various components built into each housing.
In addition, since it is important for portable radio devices to deal with unwanted radiation, a shield member is used to improve the resistance to external noise and prevent the noise generated from the parts from adversely affecting the radio unit. Is provided. Since the shield member is made of, for example, metal and has a certain degree of strength, the shield member is also used as a component for increasing the strength of the portable radio device described above.
JP 2003-8320 A

  As described above, in conventional portable wireless devices, the degree of freedom of arrangement of components incorporated in the housing is reduced due to the trend toward downsizing and design emphasis. For this reason, the tendency for the built-in antenna and other components to approach each other is inevitable. However, there is a problem that the antenna and the reference potential portion are too close, especially when a member connected to the reference potential layer on the circuit board such as a shield member exists in the vicinity of the antenna. Antenna characteristics will deteriorate. Therefore, it is necessary to realize a component shape and arrangement that do not impair the antenna characteristics.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to maintain good antenna characteristics while realizing downsizing while ensuring a predetermined strength.

  In order to solve the above problems, in the present invention, as a first means, a circuit board on which a plurality of electronic components are mounted and a reference potential layer is formed in a main body, and a key switch that receives an operation by a user are provided. A key board, a wall portion standing on the reference potential layer so as to surround at least two electronic components among the plurality of electronic components, and a flat plate portion closing one opening of the wall portion. A shield member disposed between the circuit board and the key board and covering the electronic component on the circuit board and supporting the key board, and the circuit board and the key. A portable wireless device in which an antenna that performs wireless communication with a base station is disposed on a side of a substrate and the shield member, and a wall portion near the antenna is located on an inner side than an end portion of a flat plate portion near the antenna Located in It was adopted what was arranged so.

  As the second means, in the first means, the antenna includes a first portion facing each end of the circuit board, the key board, and the shield member, and the shield member of the circuit board. The thing which has the 2nd site | part which opposes the surface where one is not arranged was employ | adopted.

  As a third means, in the first or second means, the electronic component includes a part constituting a transmitting part, a part constituting a receiving part, and a part constituting a control part, and the reference potential layer And the wall portion is provided so as to partition the transmitting portion, the receiving portion, and the control portion, and the transmitting portion is disposed at a position near the antenna on the circuit board, and What provided the opening part between the said wall part located between the said transmission parts and the said circuit board was employ | adopted.

  According to the present invention, the shield member is shaped to support the key board while separating the electronic component on the circuit board from the outside and blocking the noise, and a part of the shield member is separated from the antenna. The portable radio can be reduced in size without impairing the operability of the key switch, and the characteristics of the antenna built in the main body can be kept good.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an appearance of a mobile phone 1 (portable wireless device) in the present embodiment. The mobile phone 1 includes a first main body 4 having a display unit 2 and a speaker 3, and a second main body 7 having an operation unit 5 and a microphone 6. The first main body 4 and the second main body 7 are configured such that one end portion is connected by a hinge portion 8 and the other end portions thereof come close to / separate when the hinge portion 8 rotates. Thereby, the mobile phone 1 can be folded in a state in which the first main body 4 and the second main body 7 are overlapped in the thickness direction.

  FIG. 2 is an exploded perspective view showing a configuration of the second main body 7, and FIG. 3 is a cross-sectional view showing a partial structure of the second main body 7. The second main body 7 includes an upper housing 11 and a lower housing 12, a circuit board 13, a shield member 14, a key board 15, an antenna 16, and a battery 17.

Various electronic components 18 are mounted on the circuit board 13, and a reference potential layer 19 is formed surrounding the electronic components 18. Specifically, the electronic component 18 is a variety of elements such as a transistor and a capacitor that constitute a transmission unit 18a and a reception unit (not shown), and a variety of elements such as a CPU (not shown) that constitutes a control unit. .
The battery 17 supplies electric power to each electronic component.

The shield member 14 is a conductive metal member, and includes a flat plate portion 20 and a wall portion 21. The flat plate portion 20 covers one side of the circuit board 13. The wall portion 21 is provided so as to correspond to the reference potential layer 19 and is formed so as to protrude from the flat plate portion 20 and to be in contact with the reference potential layer 19.
The shield member 14 is not limited to a metal member, and for example, the flat plate portion 20 is formed of metal, the wall portion 21 is formed of plastic or resin, and both are bonded with an adhesive, and then the wall portion is formed. 21 may be formed by coating a conductive layer, or the entire shield member 14 may be formed of plastic or resin, and the conductive layer may be coated thereon.

The operation unit 5 has a plurality of buttons for receiving operations from the user.
The key board 15 includes a key switch 22 on the surface thereof. The key switch 22 is provided corresponding to the button of the operation unit 5 and is pressed when the operation unit 5 is operated. The key substrate 15 is provided between the upper housing 11 and the flat plate portion 20 of the shield member 14. The shield member 14 supports the key substrate 15 with the flat plate portion 20 so that the key substrate 15 is not deformed even if the key substrate 15 is pressed by the user via the operation unit 5. For this reason, when a user operates each button, each button can give substantially the same operational feeling to the user, and the operability of the button can be improved.

On the other hand, the antenna 16 is made of a radiating element made of sheet metal, metal foil, or conductive film, and has a first portion 16a and a second portion 16b that are substantially orthogonal, and has a substantially L-shaped cross section. . The first portion 16 a faces the wall portion 21 of the shield member 14. The second portion 16 b faces the surface of the circuit board 13 that is not covered with the shield member 14.
The antenna 16 is affixed to the inner wall surface of the lower housing 12 or provided on a base (not shown) made of plastic or resin, and the base is attached to the lower housing 12 via an engaging means or the like. To be fixed.

  In the mobile phone 1 having such a configuration, the display unit 2 displays and notifies the user of various information such as the operation status and the telephone number of the other party. The speaker 3 outputs various sounds such as a sound emitted from the other party. The operation unit 5 receives an operation from the user. The microphone 6 captures various sounds emitted around the mobile phone 1. The antenna 16 outputs the radio wave received from the base station to the reception unit, and outputs the signal output from the transmission unit 18a as a radio wave to the base station.

  By the way, the antenna 16 has a property that the antenna characteristics are deteriorated when a member connected to the reference potential layer is arranged very close to the antenna 16. In the mobile phone 1 of the present embodiment, the shield member 14 is attached to the antenna 16. It corresponds to. Therefore, in the present embodiment, the end of the shield member 14 on the antenna 16 side is retracted to the limit position where the flat plate portion 20 covers the electronic component 18 on the circuit board 13 and the key board 15 can be supported. did. That is, among the wall portions 21 constituting the shield member 14, the wall portions 21 a and 21 c on the antenna 16 side are arranged on the inner side by a distance d from the end portion 20 a on the antenna 16 side of the flat plate portion 20 and separated from the antenna 16. It is.

  Further, in arranging the electronic components 18 on the circuit board 13, the resistance of each electronic component 18 to noise and the noise generated by each electronic component 18 are considered. When the receiving unit is affected by noise, the receiving sensitivity is deteriorated, whereas the transmitting unit 18a is hardly affected by noise. Therefore, the transmitter 18a that does not have any problem even if the noise shielding by the shield member 14 is not relatively severe is disposed at a position close to the antenna 16. As a result, the electronic component 18 closest to the antenna 16, that is, the wall portion 21 a that separates the transmitting portion 18 a and the antenna 16 can be made not to require strict noise blocking. Therefore, the wall portion 21 a and the circuit board 13 are not required. The opening 21b was formed between the two. By forming the opening portion 21b, the wall portion 21a can be separated from the antenna 16, so that the deterioration of the antenna characteristics can be further prevented.

  Furthermore, the other wall portion 21c facing the antenna 16 is retracted from the end portion 20a of the flat plate portion 20 on the antenna 16 side. As a result, the conductive member can be moved away from the antenna 16, so that the antenna characteristics can be maintained.

  With the configuration as described above, according to the present embodiment, the operation portion 5 is close to the other end portion of the second body 7 (the end portion on the opposite side of the end portion connected to the first body 4 by the hinge portion 8). Therefore, the cellular phone 1 can be miniaturized and the operability of the operation unit 5 is not impaired. Further, since the wall portions 21a and 21c of the shield member 14 facing the antenna 16 can be arranged on the inner side of the end portion 20a of the flat plate portion 20 facing the antenna 16, the distance from the antenna 16 can be increased. The loss of characteristics can be greatly reduced.

It is a perspective view which shows the external appearance of the mobile telephone in one Embodiment of this invention. It is a disassembled perspective view which shows the structure of a part of mobile telephone in one Embodiment of this invention. It is sectional drawing which shows the structure of the characteristic part of the mobile telephone in one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Mobile telephone, 2 ... Display part, 3 ... Speaker, 4 ... 1st main body, 5 ... Operation part, 6 ... Microphone, 7 ... 2nd main body, 8 ... Hinge part, 11 ... Upper housing | casing, 12 ... Lower housing Body, 13 ... circuit board, 13a ... end, 14 ... shield member, 15 ... key board, 16 ... antenna, 16a ... first part, 16b ... second part, 17 ... battery, 18 ... electronic component, 18a ... transmission , 19 ... reference potential layer, 20 ... flat plate part, 20a ... end, 21 ... wall part, 21a ... wall part, 21b ... opening part, 21c ... wall part, 22 ... key switch

Claims (3)

A circuit board on which a plurality of electronic components are mounted and a reference potential layer is formed in the main body, a key board having a key switch for receiving an operation by a user, and at least two or more of the plurality of electronic components A wall portion erected on the reference potential layer so as to surround each component, and a flat plate portion that closes one opening of the wall portion, and is disposed between the circuit board and the key substrate. A shield member that covers the electronic component on the circuit board and supports the key board; and an antenna that performs radio communication with a base station on a side of the circuit board, the key board, and the shield member Is a portable wireless device provided with
A portable wireless device, wherein a wall near the antenna is arranged so as to be located inside an end of a flat plate near the antenna.   The antenna includes a first part that faces each end of the circuit board, the key board, and the shield member, and a second part that faces a surface of the circuit board on which the shield member is not disposed. The portable wireless device according to claim 1, further comprising:   The electronic component includes a component that constitutes a transmission unit, a component that constitutes a reception unit, and a component that constitutes a control unit, and the reference potential layer and the wall portion include the transmission unit, the reception unit, and the And the transmitter is disposed at a position near the antenna on the circuit board, and the wall portion and the circuit located between the antenna and the transmitter The portable wireless device according to claim 1, wherein an opening is provided between the substrate and the substrate.

Images