JP2009135239A - Portable electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide portable electronic apparatus having a configuration that prevents the occurrence of radiation of radiated noise while utilizing a connecting sheet metal as a power supply line. <P>SOLUTION: A circuit board 70 is configured such that a plurality of electronic components 71 are formed on one face side while a shield case 60 is arranged such that the one face side is covered. The other face side of the circuit board 70 is formed with a battery connection terminal 72 for achieving electrical conduction in-between the electronic components 71 formed on the one face side. A connecting sheet metal 73 is arranged between the circuit board 70 and the shield case 60. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a portable electronic device having a circuit board on which a plurality of electronic components are mounted.

  In portable electronic devices, circuit boards on which various electronic components are mounted are provided. In addition, the circuit board is formed of a plurality of layers, and signal lines and power supply lines for electrical connection between electronic components are formed on the surface layer and the inner surface layer. A battery connection terminal is formed on the surface on the one surface side for electrical connection with the feeder line. In addition, when a battery is connected to the battery connection terminal, predetermined power is supplied to various electronic components and electronic circuits via the feeder line.

Further, regarding wiring of circuit boards, a technique has been proposed in which a strip-shaped connection sheet metal is mounted on a circuit board as a jumper line on the circuit board or as a connection line for connecting different circuit boards. (See Patent Document 1).
JP-A-10-335770

  However, as in Patent Document 1, when the connection sheet metal is simply formed on the surface layer of the circuit board and a plurality of electronic circuits are electrically connected, the connection sheet metal is exposed to the outside, There was a risk of radiation noise being emitted from the sheet metal.

  The present invention has been made in view of the above-described problems, and one of its purposes is to reduce radiation noise radiation while electrically connecting a plurality of electronic circuits via a conductive connecting member. It is providing the portable electronic device of the structure made to do.

  In order to solve the above problems, a portable electronic device according to the present invention covers a circuit board on which a plurality of electronic circuits are formed and the electronic circuit on the side where the electronic circuits are formed on the circuit board. A conductive case member attached to the circuit board, and a conductive connection member disposed between the circuit board and the conductive case member, wherein the plurality of electronic circuits are interposed via the conductive connection member. And electrically connected.

  Moreover, in the said portable electronic device, it is preferable that the said electroconductive connection member is attached to the said electroconductive case member.

  In the portable electronic device, an electronic component having the electronic circuit is mounted on a surface of the circuit board, and the electronic component is disposed between the conductive connection member and the circuit board. It is preferable.

  Moreover, in the said portable electronic device, it is preferable that the nonelectroconductive member is formed between the said electronic component and the said electroconductive connection member.

  In the portable electronic device, the circuit board or the conductive case member is formed in a rectangular plate shape, and the conductive connection member extends along a longitudinal direction of the circuit board or the conductive case member. It is preferable to be disposed.

  The portable electronic device preferably includes a battery, and the conductive connecting member supplies power from the battery to the plurality of electronic circuits.

  According to the present invention, radiation noise can be reduced while electrically connecting a plurality of electronic circuits via a conductive connecting member.

  FIG. 1 is an external perspective view of a mobile phone device 1 which is an example of a mobile electronic device that communicates with an external device (base station) according to the present invention.

  The cellular phone device 1 includes an operation unit side body 2 composed of a front case 2a and a rear case 2b on the surface, and a display unit side body 3 composed of a front panel 3a and a rear panel 3b on the surface. It is prepared for. The operation unit side body unit 2 is configured such that the operation button group 11 and the voice input unit 12 to which the voice uttered by the user of the mobile phone device 1 is input are exposed on the surface of the front case 2a. The The operation button group 11 includes a function setting operation button 13 for operating various functions such as various settings, a telephone book function, and a mail function, and an input operation for inputting a telephone number and characters such as mail. The button 14 and a determination operation button 15 for performing determination and scrolling in various operations are configured. Further, a cap 16 that covers an interface for communicating with an external device (for example, a host device) is provided on the side surface of the operation unit side body 2.

  Further, the display unit side body unit 3 is configured such that a display 21 for displaying various information and an audio output unit 22 for outputting the voice of the other party of the call are exposed on the front panel 3a.

  Moreover, the upper end part of the operation part side housing | casing part 2 and the lower end part of the display part side housing | casing part 3 are connected via the hinge mechanism 4, as shown in FIG. In addition, the mobile phone device 1 moves the operation unit side body unit 2 and the display unit side body unit 3 connected to each other via the hinge mechanism 4 to display the operation unit side body unit 2 and the display. The part-side casing 3 can be in a state of being open to each other (open state), or the operation part-side casing 2 and the display unit-side casing 3 can be in a folded state (folded state). In the present embodiment, the foldable mobile phone device 1 using the hinge mechanism 4 is described. However, the foldable mobile phone device 1 is not foldable. A slide type that is slid on the axis, a rotary type that is configured to rotate one casing around an axis along the overlapping direction, and a configuration in which both casings 2 and 3 are connected via a biaxial hinge, Furthermore, the operation unit side body 2 and the display unit side body 3 may be arranged in a single housing (so-called straight type).

  FIG. 2 is an exploded perspective view of members built in the operation unit side body 2.

  As shown in FIG. 2, the operation unit side body unit 2 includes a front case 2a, a key sheet 40 constituting the operation button group 11 described above, a flexible printed circuit board 50, and a shield case 60 (conductive case). A circuit board 70 including a layer in which a reference potential is formed and various electronic components such as an RF (Radio Frequency) module for a mobile phone, a rear case 2b, a battery 80, and a battery lid 90. In the operation unit side body 2, the front case 2a, the key sheet 40, the flexible printed circuit board 50, the shield case 60, the circuit board 70, and the rear case 2b are arranged in a stacked manner. . In addition, the battery 80 is detachably accommodated from the outside of the rear case 2 b and is covered with a battery lid 90.

  Further, the front case 2a and the rear case 2b are arranged so that their concave inner surfaces face each other, and are joined so that their outer peripheral edges overlap each other. Further, the key sheet 40, the flexible printed circuit board 50, the shield case 60, and the circuit board 70 are sandwiched between the front case 2a and the rear case 2b. That is, the shield case 60 is laminated so as to cover the circuit board 70, the flexible printed circuit board 50 is laminated on the upper surface side of the shield case 60, and the key sheet 40 is arranged on the upper surface of the flexible printed circuit board 50. Are stacked.

  Moreover, the circuit board 70 and the shield case 60 are partially fixed in a detachable manner at a plurality of connecting portions. A plurality of electronic circuits are formed on the circuit board 70. The electric circuit is composed of various electronic components that exhibit a predetermined function. Various electronic components form a plurality of circuit blocks by a predetermined combination. For example, various circuit blocks including a wireless circuit, a power supply circuit, a digital circuit, and the like are formed.

  The shield case 60 is a metal member having a shape in which one wide surface of a thin rectangular parallelepiped is opened. The shield case 60 may be made of a skeleton made of resin and a conductor film formed on the surface thereof, in addition to being made of metal.

  The flexible printed circuit board 50 has a plurality of key switches 51, 52, 53 on the surface on the front case 2 a side, and is placed on the flat plate portion 42 in the shield case 60. The key switches 51, 52, and 53 of the flexible printed circuit board 50 have a structure having a metal dome that is a three-dimensionally bent metal plate. When the apex of the bowl-shaped shape is pressed, the metal dome comes into contact with a switch terminal formed in an electric circuit (not shown) printed on the surface of the flexible printed circuit board 50 and becomes electrically conductive. The flexible printed circuit board 50 is a board configured by sandwiching wiring between a plurality of insulating films.

  The key sheet 40 is configured by attaching the operation button group 11 to the surface of a silicon rubber sheet 41 with an adhesive. The function setting operation button 13, the input operation button 14, and the determination operation button 15 constituting the operation button group 11 in the key sheet 40 are disposed at positions facing the key switches 51, 52, 53 on the flexible printed circuit board 50. These are arranged so as to be exposed from key holes formed in the front case 2a described later.

  A plurality of key holes are formed on the inner surface of the front case 2a facing the display 21 of the display unit side body 3 in a state in which the cellular phone device 1 is folded. From each of the plurality of key holes, the pressing surfaces of the function setting operation button 13, the input operation button 14 and the determination operation button 15 formed on the key sheet 40 are exposed. By pressing down the pressing surfaces of the function setting operation button 13, the input operation button 14 and the determination operation button 15 constituting the exposed operation button group 11, the metal dome in each of the corresponding key switches 51, 52 and 53 is pressed. The apex of (saddle-like shape) is pressed and comes into electrical contact with the switch terminal.

  As shown in FIG. 3, an antenna 66 housed in a base 65 is disposed on one end side of the rear case 2b. That is, the antenna 66 is disposed on one end side of the mobile phone device 1. Specifically, the antenna 66 is disposed on the end side opposite to the hinge mechanism 4 side in the mobile phone device 1. The antenna 66 is formed of a strip-shaped sheet metal. Note that the arrangement position, shape, material, and the like of the antenna 66 here are merely examples, and the present invention is not limited thereto.

  The antenna 66 is supplied with power from the circuit board 70 via a power supply terminal. The antenna 66 is fed from the circuit board 70 via a wiring pattern formed on the flexible printed circuit board 50 and is connected to the RF module of the circuit board 70 and the like.

  Here, the configuration of the circuit board 70 will be described. As described above, on the circuit board 70, the electronic components 71 constituting a plurality of electronic circuits are mounted on the one surface side, and the shield case 60 (conductive case) covers the one surface side. It is arranged. Further, as shown in FIG. 4, a battery connection terminal 72 is formed on the other surface side of the circuit board 70 for electrical connection with the electronic component 71 formed on the one surface side. 4A is a front view of one side of the circuit board 70, FIG. 4B is a side view of the circuit board 70, and FIG. 4C is a shield on the circuit board 70. It is a side view in case the case 60 is arrange | positioned.

  Further, a connection sheet metal 73 (conductive connection member) is disposed between the circuit board 70 and the shield case 60. Further, as shown in FIG. 4, the connection sheet metal 73 is disposed on one side of the circuit board 70 so as to be electrically connected from one electronic component 71 to another electronic component 71. Further, as shown in FIG. 4, the connection sheet metal 73 and the circuit board 70 are connected by, for example, solder A.

  Here, the circuit board 70 is provided with a via hole at a position where the battery connection terminal 72 is formed, and the battery connection terminal 72 and the connection sheet metal 73 are electrically connected through the via hole. Therefore, when the battery 80 is connected to the battery connection terminal 72, predetermined power is supplied to various electronic components 71 and electronic circuits via the connection sheet metal 73. Accordingly, the connection sheet metal 73 functions as a bypass line for supplying power to the battery 80.

  4A, the connection sheet metal 73 is disposed on the component mounting surface so as to be covered by the shield case 60 as a bypass line for supplying power to the battery 80. As shown in FIG.

  Further, the connection sheet metal 73 is disposed on the upper surface of the electronic component 71 as shown in FIG. According to such a configuration, since the electronic component 71 is disposed between the circuit board 70 and the connection sheet metal 73, there is an advantage that the electronic component 71 is less likely to be detached from the circuit board 70.

  Moreover, the rigidity of the circuit board 70 itself can be ensured by arranging the connection sheet metal 73 on the circuit board 70. Further, since the connection sheet metal 73 can be connected from one electronic component 71 of the circuit board 70 to the other electronic component 71 in the shortest distance, the impedance can be lowered.

  Here, the relationship between the sheet metal 73 for connection and the electronic component 71 is demonstrated. The electronic component 71 is classified into an electronic component that is not affected even when a metal comes into contact with an electronic component that is not desirable to be brought into contact with a metal. For example, in the case where the connection sheet metal 73 is disposed on the upper surface of the electronic component 71 in which it is not preferable that the metal is in direct contact, an insulating underfill is provided between the electronic component 71 and the connection sheet metal 73. By forming a coating or adhesive tape, the connection sheet metal 73 is prevented from directly contacting the electronic component 71. In addition, for example, the connection sheet metal 73 may be disposed on the circuit board 70 so as to ensure a certain clearance on the upper surface of the electronic component 71 in which it is not preferable that the metal is in direct contact. The connection sheet metal 73 may be disposed on the circuit board 70 so as to avoid the upper surface of the electronic component 71 in which it is not preferable that the metal is in direct contact.

  Further, between the connection sheet metal 73 and the shield case 60, a certain clearance is secured, an insulating underfill is applied, or an adhesive tape is formed to form the connection sheet metal 73. It is preferable that the shield case 60 is configured not to be in direct contact.

  In addition, a conductive material is applied to the other surface side of the circuit board 70. Therefore, the electronic component 71 and the connection sheet metal 73 formed on the circuit board 70 are arranged so as to cover the conductive material applied to the other surface side of the circuit board 70 and the one surface side of the circuit board 70. Since it is sandwiched from both sides by the shield case 60 provided, it has a shielding effect, does not leak noise radiated from the electronic component 71 and the connection metal plate 73 to the outside, and static electricity from the outside. The noise does not get in.

  In this manner, in the cellular phone device 1 according to the present invention, the connection sheet metal 73 is disposed between the circuit board 70 and the shield case 60, so that the impedance is adjusted to be low and the allowable current of the feeder line is ensured. For this reason, it is not necessary to form a feeder line having a wide line width on the circuit board 70, so that the area of the circuit board 70 can be reduced and the number of layers of the circuit board 70 can be reduced. It is possible to reduce the size, thickness and price of the device itself.

  Further, in the cellular phone device 1 according to the present invention, since the connection sheet metal 73 can be connected from one electronic component 71 to another electronic component 71 in the shortest distance, the conventional configuration (on the circuit substrate 70). The impedance can be lowered as compared with the case of forming a power supply line pattern, and the amount of noise radiated can be reduced.

  Further, in the cellular phone device 1 according to the present invention, since the impedance can be lowered as compared with the conventional configuration, the power consumption can be reduced and the usage time can be extended.

  Further, in the mobile phone device 1 according to the present invention, the warp strength of the circuit board 70 and the shield case 60 can be increased by using a high strength metal plate as the connection metal plate 73.

  In particular, the shield case 60 is likely to be subjected to a load due to pressing on the key switches 51, 52, and 53. However, since the connecting sheet metal 73 can increase the warp strength of the shield case 60, the contact load is large. Will be reduced. In particular, when the connection sheet metal 73 is disposed at a portion corresponding to the key switches 51, 52, 53 in the shield case 60, this effect becomes more remarkable.

  Further, in the mobile phone device 1 according to the present invention, since the connection sheet metal 73 is covered with the circuit board 70 and the shield case 60, noise radiated from the connection sheet metal 73 is not leaked to the outside. Therefore, it is possible to perform suitable communication without affecting the transmission / reception sensitivity.

  In FIG. 4, it has been described that the bypass line for supplying power to the battery 80 is configured by one connection sheet metal 73, but the present invention is not limited thereto, and may be configured by a plurality of connection sheet metals 73. . In the present embodiment, the connection sheet metal 73 is described as a bypass line for supplying power to the battery 80. However, the present invention is not limited to this. For example, the connection sheet metal 73 is used as a power supply line output from a DC / DC capacitor. Also good. Moreover, in this embodiment, although the sheet metal 73 for connection was mentioned as an example of an electroconductive connection member, this invention is not limited to this, For example, other shapes and magnitude | sizes, such as a wire-like electroconductive member Even a conductive member formed in this manner is applicable.

It is a perspective view which shows the external appearance of the mobile telephone apparatus which concerns on this invention. It is a disassembled perspective view of the member incorporated in the operation part side housing | casing part. It is a figure when the rear case of the operation part side housing | casing part permeate | transmits from the side surface. It is a figure which shows the structure of a circuit board.

Explanation of symbols

1 Cellular phone device 60 Shield case (conductive case)
70 Circuit Board 71 Electronic Component 72 Battery Connection Terminal 73 Connection Sheet Metal (Conductive Connection Member)
80 batteries

Claims (6)

A circuit board on which a plurality of electronic circuits are formed;
On the side of the circuit board where the electronic circuit is formed, a conductive case member attached to cover the electronic circuit;
A conductive connecting member disposed between the circuit board and the conductive case member;
The portable electronic device, wherein the plurality of electronic circuits are electrically connected through the conductive connection member.   The portable electronic device according to claim 1, wherein the conductive connection member is attached to the conductive case member. The circuit board has an electronic component having the electronic circuit mounted on the surface,
The portable electronic device according to claim 1, wherein the electronic component is disposed between the conductive connecting member and the circuit board.   The portable electronic device according to claim 3, wherein a non-conductive member is formed between the electronic component and the conductive connection member. The circuit board or the conductive case member is formed in a rectangular plate shape,
The portable electronic device according to claim 1, wherein the conductive connection member is disposed along a longitudinal direction of the circuit board or the conductive case member. Have a battery,
The portable electronic device according to claim 1, wherein the conductive connecting member supplies power from the battery to the plurality of electronic circuits.

Images