JP2009224658A - Portable electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable electronic apparatus capable of preventing functional degradation of an electronic component due to noise. <P>SOLUTION: This portable electronic apparatus 1 includes: a housing 2; a circuit board 70 arranged in the housing 2, and having a reference potential pattern layer 73 formed on one-side surface 72; a plurality of electronic components 71 arranged in the housing 2; a signal line 75 having a first conductive part arranged on a front surface and a center conductor arranged in the inside and electrically connecting the plurality of electronic components 71; and a case member 60 arranged on one-side surface 72 side of the circuit board 70, and covering at least partial electronic components 71 within the plurality of electronic components 71. In a state where the signal line 75 is sandwiched between the case member 60 and the circuit board 70, the first conductive part is made to abut on the reference potential pattern layer 73. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a portable electronic device such as a cellular phone.

  2. Description of the Related Art Conventionally, a circuit board on which a plurality of electronic components such as a CPU and a transmission / reception unit are mounted is incorporated in a casing of a portable electronic device such as a cellular phone. Many electronic components mounted on the circuit board are susceptible to noise such as electromagnetic waves, such as high-frequency circuit components for wireless communication. In addition, these electronic components themselves emit noise during operation. Therefore, in order to prevent radiated noise from affecting other electronic components in the housing, the surface of the circuit board on which the electronic components are arranged is covered with these electronic components and the electronic components are isolated from each other. There has been proposed a portable electronic device in which a shielding case is disposed (see, for example, Patent Document 1).

According to the above portable electronic device, a plurality of electronic components are covered with the shield case, and the electronic components are also isolated from each other. Therefore, noise radiated from the electronic components affects other electronic components and functions thereof. Can be prevented from decreasing.
JP 2006-238204 A

By the way, some electronic components mounted on a circuit board may be connected by a signal line such as a coaxial cable. Further, when a signal is transmitted between the electronic components connected by the signal line, noise is generated from the signal line.
For this reason, in the portable electronic device proposed in Patent Document 1, when the function of the electronic component arranged around the signal line deteriorates due to noise generated from the signal line, or noise enters the signal line from the outside. In some cases, the function of the electronic component connected by the signal line is deteriorated.

  Accordingly, an object of the present invention is to provide a portable electronic device that can prevent the functional degradation of an electronic component due to noise.

  The present invention includes a housing, a circuit board disposed in the housing and having a reference potential pattern layer formed on one surface, a plurality of electronic components disposed in the housing, and a surface. A signal line having a first conductive portion to be disposed and a central conductor disposed inside and electrically connected to at least one of the plurality of electronic components; and disposed on the one surface of the circuit board. A case member, wherein the first conductive portion is in contact with the reference potential pattern layer in a state where the signal line is sandwiched between the case member and the circuit board. The present invention relates to a portable electronic device.

  Further, it is preferable that the case member has a second conductive portion, and the second conductive portion is in contact with the first conductive portion in the signal line.

  The first conductive part is preferably configured to be elastically deformable.

  Further, it is preferable that the reference potential pattern layer or the case member formed on the one surface of the circuit board is provided with a recess in which at least a part of the signal line is disposed.

  Moreover, it is preferable that at least one of the plurality of electronic components is an antenna that transmits or receives a high-frequency signal.

  The signal line is preferably a coaxial line having an insulating portion inside the first conductive portion and the center conductor inside the insulating portion.

  In addition, at least some of the plurality of electronic components are mounted on the circuit board, and the case member is arranged on the one surface of the circuit board so as to cover the at least some electronic components. It is preferable to be provided.

  According to the present invention, the signal line having the first conductive portion on the surface is sandwiched between the case member and the circuit board, and the first conductive portion is brought into contact with the reference potential pattern layer of the circuit board. Therefore, it is possible to prevent the deterioration of the function of the electronic component due to noise.

  The best mode for carrying out the present invention will be described below with reference to the drawings. First, the basic structure of a mobile phone 1 as an embodiment of the mobile electronic device of the present invention will be described with reference to FIG. FIG. 1 is a perspective view showing the mobile phone 1 with the operation unit side body 2 and the display unit side body 3 opened.

  The mobile phone 1 is a foldable mobile phone 1, which has a substantially rectangular parallelepiped-shaped operation unit side housing 2, a substantially rectangular parallelepiped display unit side housing 3, an operation unit side housing 2, and a display unit side housing. And a connecting portion 4 that connects the body 3.

  The outer surface of the operation unit side body 2 is mainly composed of a front case 21 and a rear case 22. The front case 21 constitutes the front surface 2 a side of the operation unit side body 2. The front surface 2 a of the operation unit side body 2 is a surface facing the display unit side body 3 in a state in which the mobile phone 1 is folded. The rear case 22 constitutes a back surface 2b side that is a surface opposite to the front surface 2a.

  The front case 21 is configured such that the operation key group 11 is exposed to the front surface 2a. The operation key group 11 includes input of a function setting operation key 13 for operating various functions such as various settings, a telephone book function, and a mail function, and a numeric keypad for inputting numbers of telephone numbers, characters such as mail, and the like. The operation key 14 includes a determination operation key 15 for performing various operations, scrolling in the up / down / left / right directions, and the like.

  A predetermined function is assigned to each key constituting the operation key group 11 according to the open / closed state of the operation unit side body 2 and the display unit side body 3 and the type of application being activated (key).・ Assign). The cellular phone 1 performs an operation according to a function assigned to each key when each key constituting the operation key group 11 is pressed by the user.

  On the front surface 2 a of the operation unit side body 2, a voice input unit 12 to which a voice uttered by the user of the mobile phone 1 during a call is input. The voice input unit 12 is disposed in the vicinity of the end on the opposite side of the connecting unit 4 in the longitudinal direction of the operation unit side body 2. That is, the voice input unit 12 is arranged on one end side in the longitudinal direction in the opened state of the mobile phone 1.

  The side surface 2c of the operation unit side body 2 is charged with, for example, an interface for transmitting / receiving data to / from an external device (for example, a host device), a headphone / microphone terminal, an interface of a removable external memory, and a battery. Charging terminals are provided.

  Next, the display unit side body 3 will be described. As shown in FIG. 1, the display unit side body 3 has an outer surface mainly composed of a front case 30a and a rear case 30b. The front surface 3a of the display unit side body 3 is mainly composed of a front case 30a and a cover member 33. The front surface 3a is a surface facing the operation unit side body 2 in a state where the mobile phone 1 is folded. The back surface 3b of the display unit side body 3 is mainly composed of a rear case 30b. The back surface 3b of the display unit side body 3 is a surface opposite to the front surface 3a.

  A liquid crystal module (not shown) that displays various types of information is disposed in the display unit side body 3, and the liquid crystal module has a cover member 33 whose display unit provided on one surface thereof mainly includes a transparent portion. The display unit is disposed so as to be exposed to the front surface 3a of the display unit side body 3 from the opening formed in the front case 30a.

  In addition, the front case 30a is formed with an audio output unit 31 for outputting the voice of the other party on the call. The audio output unit 31 is disposed on the end side opposite to the connection unit 4 in the longitudinal direction of the display unit side body 3. That is, the audio output unit 31 is disposed in the vicinity of the end on the display unit side body 3 side in the open state of the mobile phone 1.

As shown in FIG. 1, the upper end portion of the operation unit side body 2 and the lower end portion of the display unit side body 3 are connected to each other via a connection unit 4 so as to be opened and closed. That is, the connecting portion 4 connects the display unit side body 3 and the operation unit side body 2 so as to be openable and closable around the opening / closing axis I.
The cellular phone 1 relatively rotates (rotates) the operation unit side body 2 and the display unit side body 3 connected via the connection unit 4, thereby causing the operation unit side body 2 and the display unit to be rotated. The side housing 3 can be brought into an open state (open state), or the operation unit side housing 2 and the display unit side housing 3 can be folded (folded state).

  Next, the internal structure of the operation unit side body 2 will be described with reference to FIG. FIG. 2 is an exploded perspective view of the operation unit side body 2.

  The operation unit side body 2 includes a front case 21, a key sheet 40 constituting the operation key group 11, the flexible wiring board 50, a case member 60, a circuit board 70, a main antenna 90, and a rear case. 22, a battery 80, and a battery cover 81.

  The front case 21 and the rear case 22 are arranged so that the inner surfaces of the concave shapes face each other, and are joined so that the outer peripheral edges thereof overlap each other. Between the front case 21 and the rear case 22, the key sheet 40, the flexible wiring board 50, the case member 60, the circuit board 70, and the main antenna 90 are incorporated so as to be sandwiched therebetween. That is, the case member 60 is laminated so as to cover the first surface 72 that is one surface of the circuit board 70, the flexible wiring board 50 is laminated on the upper surface side of the case member 60, and the upper surface of the flexible wiring board 50 is arranged. The key sheet 40 is laminated and arranged. The main antenna 90 is connected to the circuit board 70 via a wiring (not shown).

  An opening is provided outside the rear case 22, and the battery 80 is detachably accommodated in the opening. The outside of the battery 80 is covered with a battery cover 81.

  FIG. 3 is a plan view showing a state in which a plurality of electronic components 71 are arranged on the first surface 72 of the circuit board 70, and FIG. 4 is a cross-sectional view taken along the line XX of FIG. FIG. 5 is a plan view showing a state in which a plurality of electronic components 71, signal lines 75, and conductive members 76 are arranged on the first surface 72 of the circuit board 70, and FIG. 6 is a YY view of FIG. It is line sectional drawing.

  A plurality of electronic components 71 are mounted on the first surface 72 of the circuit board 70. Examples of the electronic component 71 mounted on the circuit board 70 include circuit blocks such as an RF (Radio Frequency) circuit, a CPU circuit, and a power supply circuit. The plurality of electronic components 71 are electrically connected by wiring (not shown) provided on the circuit board 70 and inside the circuit board 70, signal lines to be described later, and the like.

A plurality of connectors 74 are provided on the first surface 72. Each of the plurality of connectors 74 is connected to a predetermined electronic component 71 via a wiring (not shown). Examples of the electronic component 71 connected to the connector 74 include a sub-antenna 711 that receives a high-frequency signal. The connector 74 is also connected to an electronic component that is not mounted on the circuit board 70. Examples of such an electronic component include a main antenna 90 that receives or transmits a high-frequency signal.
The plurality of connectors 74 are connected by a signal line 75 that is preferably used for transmission of a high-frequency signal.

  Thereby, the high frequency signal received by the sub antenna 711 and the high frequency signal received by the main antenna 90 are transmitted to the electronic component 71 mounted on the circuit board 70 via the signal line 75. In addition, a high frequency signal transmitted from the electronic component 71 mounted on the circuit board 70 is transmitted to the main antenna 90 via the signal line 75.

  A reference potential pattern layer 73 is formed on the first surface 72 so as to partition the plurality of electronic components 71. The reference potential pattern layer 73 is formed, for example, between the wireless circuit and the power supply circuit adjacent thereto, or between the wireless circuit and the digital circuit adjacent thereto.

FIG. 7 is a perspective view of the signal line 75.
The signal line 75 includes a first conductive portion 751 disposed on the surface and a central conductor 752 that is disposed inside and electrically connects the plurality of electronic components 71. Specifically, the signal line 75 includes a center conductor 752, an insulating portion 753 covering the outer periphery of the center conductor 752, an outer conductor portion 754 covering the outer periphery of the insulating portion 753, and a first conductor covering the outer periphery of the outer conductor portion 754. 1 is a coaxial line having one conductive portion 751.
In the signal line 75, the insulating portion 753 is made of an elastically deformable material such as polyethylene. Therefore, the first conductive portion 751 constituting the surface of the signal line 75 can also be elastically deformed.

The signal line 75 is arranged mainly along the reference potential pattern layer 73. As a result, the first conductive portion 751 of the signal line 75 comes into contact with the reference potential pattern layer 73.
The conductive member 76 is disposed in a region where the signal line 75 is not disposed in the region where the reference potential pattern layer 73 is formed. As the conductive member 76, a metal member such as a copper wire or a platinum wire, or a material that can be elastically deformed by covering the outer periphery with a metal material using an elastically deformable material such as polyethylene as a core wire, or the like is used. be able to.

8 is a plan view of the case member 60, and FIG. 9 is a cross-sectional view taken along the line ZZ of FIG.
The case member 60 has a rectangular shape in plan view, and has a thin box shape with an open surface on the circuit board 70 side. The case member 60 is made of a metal material and has conductivity. That is, the entire case member 60 functions as the second conductive portion.

The case member 60 includes a rectangular flat plate portion 61 that constitutes an upper surface, and a rib 62 that protrudes substantially perpendicularly from the flat plate portion 61 toward the open surface side. The ribs 62 are provided on the periphery and inside of the flat plate portion 61. The rib 62 is formed so as to correspond to the reference potential pattern layer 73 provided on the circuit board 70. Specifically, the rib 62 is formed on the reference potential pattern layer 73 in a state where the case member 60 is placed on the circuit board 70.
The rib 62 is formed to be equal to or sufficiently higher than the height of the electronic component 71 having the highest height among the plurality of electronic components 71 mounted on the circuit board 70.
The case member 60 may be formed of a metal material, a skeleton may be formed of a resin, and a conductor film may be formed on the surface thereof. In this case, the surface of the case member 60 becomes the second conductive portion.

  The bottom surface of the rib 62 is provided with a concave portion 63 that is recessed toward the flat plate portion 61 side. The recess 63 is formed in a groove shape along the direction in which the rib 62 extends.

10 is a plan view showing a state in which the case member 60 is disposed on the first surface 72 side of the circuit board 70, and FIG. 11 is a cross-sectional view taken along line AA of FIG.
The case member 60 described above is disposed on the first surface 72 side of the circuit board 70 so that the rib 62 is positioned on the reference potential pattern layer 73. Thus, the plurality of electronic components 71 are surrounded by the ribs 62 and covered with a part of the flat plate portion 61.
Here, the case member 60 is electrically connected to the reference potential pattern layer 73 with the bottom surface of the rib 62 contacting the reference potential pattern layer 73 of the circuit board 70. The case member 60 has the same potential as that of the reference potential pattern layer 73. That is, the case member 60 functions as a shield case.

The signal line 75 and the conductive member 76 are sandwiched between the case member 60 and the circuit board 70 in a state where the signal line 75 and the conductive member 76 are accommodated in contact with the recess 63 provided in the rib 62.
Thus, the case member 60 directly contacts the reference potential pattern layer 73 of the circuit board 70 and also contacts the reference potential pattern layer 73 via the signal line 75 or the conductive member 76.

The case member 60 serves as a shield case to suppress external noise such as high frequency from acting on a plurality of electronic components 71 mounted on the circuit board 70, and also to an RF (Radio Frequency) circuit, a CPU circuit, a power circuit, etc. The noise radiated from the plurality of electronic components 71 mounted on the circuit board is shielded to prevent the other electronic components, the receiving circuit connected to the main antenna 90, and the like from acting.
That is, the rib 62 functions as a partition that partitions the plurality of electronic components 71 and shields noise radiated from other electronic components 71 mounted on the circuit board 70 together with a part of the flat plate portion 61.

  As shown in FIG. 2, the flexible wiring board 50 has a plurality of key switches 51, 52, 53 on the surface on the front case 21 side, and is placed on the flat plate portion 61 of the case member 60. The key switches 51, 52, and 53 of the flexible wiring board 50 have a structure having a metal dome that is a three-dimensionally curved metal plate. When the apex of the bowl-shaped shape is pressed, the metal dome contacts a switch terminal formed in an electric circuit (not shown) printed on the surface of the flexible wiring board 50 and is electrically connected. The flexible wiring board 50 is obtained by sandwiching wiring between a plurality of insulating films.

  The key sheet 40 is configured by attaching a plurality of key tops 42, 43, 44 to the surface of a silicon rubber sheet 41 with an adhesive. A plurality of key tops 42, 43, 44 in the key sheet 40 are arranged at positions overlapping the key switches 51, 52, 53 of the flexible wiring board 50, respectively, and key holes 21 a, 21 b, It arrange | positions so that it may each be exposed from 21c.

  According to the mobile phone 1 described above, for example, a high-frequency signal received by the sub-antenna 711 is transmitted to the electronic component 712 via the signal line 75 different from the wiring arranged on the circuit board 70 or inside the circuit board 70. (See FIG. 10).

  Here, the signal line 75 having the first conductive portion 751 on the surface is sandwiched between the case member 60 and the circuit board 70, and the first conductive portion 751 contacts the reference potential pattern layer 73 of the circuit board 70. It is touched. Therefore, the signal line 75 and the reference potential pattern layer 73 are reliably in contact with each other, and noise radiated from the signal line 75 due to transmission of the high frequency signal or noise entering the signal line 75 from the outside is preferably used as the reference potential pattern layer. 73 can escape.

  The case member 60 has a second conductive part, and the second conductive part abuts on the first conductive part 751. Therefore, the case member 60 and the reference potential pattern layer 73 of the circuit board 70 are electrically connected, and the case member 60 functions as a shield case.

  The case member 60 is in direct contact with the circuit board 70 and is also in contact with the elastically deformable signal line 75 or the conductive member 76. Therefore, the contact degree between the case member 60 and the reference potential pattern layer 73 formed on the circuit board 70 is improved, and the shielding effect of the case member 60 is improved.

According to the mobile phone 1 of the present embodiment, the following effects are exhibited.
A signal line 75 having a first conductive portion 751 on the surface is sandwiched between the case member 60 and the circuit board 70, and the first conductive portion 751 is brought into contact with the reference potential pattern layer 73 of the circuit board 70. I let you. Therefore, the signal line 75 and the reference potential pattern layer 73 are reliably in contact with each other, and noise emitted from the signal line 75 or noise entering the signal line 75 can be preferably released to the reference potential pattern layer 73. As a result, it is possible to prevent deterioration of the function of the electronic component 71 due to noise.

  Further, since the case member 60 is configured to have the second conductive portion, and the second conductive portion is brought into contact with the first conductive portion 751, the reference potential pattern of the case member 60 and the circuit board 70 is used. The layer 73 conducts, and the case member 60 functions as a shield case.

  Further, the case member 60 and the circuit board 70 are brought into direct contact with each other, and are also brought into contact with each other via an elastically deformable signal line 75 or a conductive member 76. Therefore, the contact degree between the case member 60 and the reference potential pattern layer 73 formed on the circuit board 70 is improved, and the shielding effect of the case member 60 is improved.

Specifically, when the case member 60 and the circuit board 70 are connected via the elastically deformable signal line 75, for example, as shown in FIG. 12, the circuit board 70 is slightly warped or deformed. Even in this case, the contact state between the case member 60 and the circuit board 70 can be maintained.
As shown in FIG. 13, even when the case member 60 is arranged slightly shifted from the circuit board 70 and slightly rises from the circuit board 70, the contact state between the case member 60 and the circuit board 70 is maintained. Can keep.

  In addition, since the antenna as the electronic component and other electronic components are connected by the signal line 75, the signal is transmitted to the high-frequency signal transmitted from the antenna that easily radiates noise and the antenna that is susceptible to noise. The influence of noise on high frequency signals can be reduced.

  In addition, a signal line 75 suitable for high-frequency signal transmission is disposed along the reference potential pattern layer 73 provided on the circuit board 70. Therefore, even when the distance for transmitting a high-frequency signal becomes longer due to the arrangement of the electronic components 71 on the circuit board 70, the plurality of electronic components 71 can be easily connected by the signal lines 75. Thereby, the freedom degree of arrangement | positioning of the some electronic component 71 connected by the signal wire | line 75 improves.

  In addition, since the outer surface of the coaxial line as the signal line 75 is the first conductive portion 751 that connects the case member 60 and the reference potential pattern layer 73 of the circuit board 70, the number of components arranged on the circuit board 70 The space can be saved.

As mentioned above, although one Embodiment of this invention was described, this invention can be implemented with a various form, without being limited to embodiment mentioned above.
For example, in the present embodiment, the first conductive portion 751 of the signal line 75 is directly sandwiched between the case member 60 and the circuit board 70, but the first conductive portion 751 has other conductivity. It may be clamped indirectly through the member which has.

  In the present embodiment, the recess 63 is provided in the rib 62 of the case member 60, but the recess may be provided in the first surface 72 of the circuit board 70, and the case member 60. And the circuit board 70 may be provided.

  In this embodiment, the main antenna 90 and the sub-antenna 711 are connected to the predetermined electronic component 71 and the signal line 75. However, the electronic component connected to the signal line is not limited to the antenna, and other than the antenna. Electronic components may be connected by signal lines.

  In the present embodiment, the mobile phone 1 is described as a mobile electronic device. However, the mobile phone 1 is not limited to this, and is not limited to this, but a PHS (registered trademark), a personal digital assistant (PDA), a portable navigation device, a notebook. A personal computer etc. may be sufficient.

  In the present embodiment, the cellular phone 1 that can be folded by the connecting portion 4 is described. However, the cellular phone 1 is not foldable, and the operation unit side body 2 and the display unit side body 3 are overlapped. One of the casings is centered on an axis along the overlapping direction of the operation unit side casing 2 and the display unit side casing 3 so that one casing is slid in one direction from the combined state. A rotation (turn) type that is rotated, or a type (straight type) in which the operation unit side body 2 and the display unit side body 3 are arranged in one housing and do not have a connecting portion may be used.

It is a perspective view which shows the mobile telephone which concerns on one Embodiment of this invention in the state which opened the operation part side housing | casing and the display part side housing | casing. It is a disassembled perspective view of the operation part side housing | casing of the mobile telephone shown in FIG. FIG. 2 is a plan view showing a state in which a plurality of electronic components are arranged on a first surface of a circuit board in the mobile phone shown in FIG. 1. FIG. 4 is a sectional view taken along line XX in FIG. 3. It is a top view which shows the state by which the some electronic component, the signal wire | line, and the electrically-conductive member are arrange | positioned on the 1st surface of the circuit board in the mobile telephone shown in FIG. FIG. 6 is a cross-sectional view taken along line YY in FIG. 5. It is a perspective view of the signal wire | line in the mobile telephone shown in FIG. It is a top view of the case member in the mobile phone shown in FIG. It is the ZZ sectional view taken on the line of FIG. It is a top view which shows the state by which the case member was arrange | positioned at the 1st surface side of the circuit board in the mobile telephone shown in FIG. It is the sectional view on the AA line of FIG. It is a figure which shows an example in the state with which the circuit board was covered with the case member in the mobile telephone shown in FIG. It is a figure which shows the other example of the state in which the circuit board was covered with the case member in the mobile telephone shown in FIG.

Explanation of symbols

1 Mobile phone (mobile electronic device)
2 Operation unit side case (case)
3 Display Unit Side Case 60 Case Member 70 Circuit Board 71 Electronic Component 72 First Surface (One Surface)
73 Reference potential pattern layer 75 Signal line

Claims (7)

A housing,
A circuit board disposed in the housing and having a reference potential pattern layer formed on one surface;
A plurality of electronic components disposed in the housing;
A signal line having a first conductive portion disposed on the surface and a central conductor disposed inside and electrically connected to at least one of the plurality of electronic components;
A case member disposed on the one surface of the circuit board,
The portable electronic device, wherein the signal line is held between the case member and the circuit board, and the first conductive portion is in contact with the reference potential pattern layer. The case member has a second conductive portion,
The portable electronic device according to claim 1, wherein the second conductive portion is in contact with the first conductive portion in the signal line.   The portable electronic device according to claim 1, wherein the first conductive portion is configured to be elastically deformable.   The reference potential pattern layer or the case member formed on the one surface of the circuit board is provided with a recess in which at least a part of the signal line is disposed. 4. The portable electronic device according to any one of 3.   The portable electronic device according to any one of claims 1 to 4, wherein at least one of the plurality of electronic components is an antenna that transmits or receives a high-frequency signal.   6. The signal line according to claim 1, wherein the signal line is a coaxial line having an insulating portion inside the first conductive portion and having the central conductor inside the insulating portion. The portable electronic device according to one item. At least a part of the plurality of electronic components is mounted on the circuit board,
The portable electronic device according to claim 6, wherein the case member is disposed on the one surface of the circuit board so as to cover the at least a part of the electronic components. machine.

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