JP2009060293A - Portable electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable electronic device having high shielding performance without increasing conductive components by forming an extended part on a conductive adhesive sheet for fixing a first circuit substrate to a case member, and bringing the extended part into contact with a reference potential pattern formed on a second circuit substrate. <P>SOLUTION: A cellular phone 1 is provided with: a case body 60 having conductivity; a conductive adhesive sheet 65 arranged on one side of the case body 60; a key substrate 50 attached to the case body 60 via the adhesive sheet 65; a circuit substrate 70 arranged opposite to the key substrate 50 in the case body 60 and having a reference potential pattern layer 75 formed on the side of the case body 60. The extended part 66 extending to the side of the circuit substrate 70 is formed on the adhesive sheet 65, and the extended part 66 is abutted on the reference potential pattern layer 75, and fixes the case body 60 to the circuit substrate 70. <P>COPYRIGHT: (C)2009,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 cellular phone as a portable electronic device stores a circuit board on which electronic components having a predetermined function are mounted. Along with the improvement in functions in recent years, the number of electronic components to be accommodated has increased, and many electronic components that generate high frequencies and the like have been mounted.

Here, on the circuit board in order to prevent the influence of the high frequency etc. on the electronic component mounted on the circuit board from the outside, and to suppress the adverse effect of the high frequency etc. from the electronic component mounted on the circuit board on the other electronic components. A structure in which a case member having shielding properties is arranged is known. For example, a wireless communication terminal is known in which a first circuit board, a case member formed of a conductive member, and a second circuit board on which a reference potential pattern is formed are stacked (for example, , See Patent Document 1).
JP 2006-238204 A

  However, in the wireless communication terminal of Patent Document 1, since the end surface of the case member and the reference potential pattern of the second circuit board are in contact with each other, when the smoothness of each other is poor, The degree of contact tends to be insufficient, and it may be difficult to ensure a high shielding effect.

  In addition, a contact component such as a tab can be used to improve the contact degree between the case member and the reference potential pattern on the second circuit board. In this case, however, cost increases due to an increase in the number of components and an increase in the number of assembly steps. There was a problem that increased work load.

  According to the present invention, an extension portion is formed on a conductive adhesive sheet that fixes the first circuit board and the case member, and the extension portion is brought into contact with a reference potential pattern formed on the second circuit board. An object of the present invention is to provide a portable electronic device with improved shielding without increasing the number of parts.

  The present invention provides a conductive case member, a conductive adhesive sheet disposed on one side of the case member, a first circuit board attached to the case member via the adhesive sheet, and the case member And a second circuit board having a reference potential pattern formed on the case member side. The adhesive sheet extends to the second circuit board side. An extension part is formed, and the extension part is in contact with the reference potential pattern and relates to a portable electronic device that fixes the case member and the second circuit board.

  In addition, an electronic component is mounted on the second circuit board, and the case member is formed to protrude toward the second circuit board so as to surround the electronic component and to be opposed to the reference potential pattern. It is preferable that the extending portion is disposed so that a part of the extending portion is sandwiched between the rib and the reference potential pattern.

  The electronic component is preferably an electronic component that generates a high frequency.

  Moreover, it is preferable that the said rib is formed with a notch, and the extending part is arranged with a part of the extending part fitted into the notch.

  The first circuit board includes a side portion that extends toward the second circuit board and is disposed along the outer surface of the rib. The side portion is interposed through the extension portion. It is preferable to be attached to the rib.

  Moreover, it is preferable that the said extension part fixes the said 2nd circuit board and the said case member so that attachment or detachment is possible.

  Moreover, it is preferable that the said extension part is comprised by the member which has the deformability in the extension direction of this extension part.

  According to the present invention, the extending portion is formed on the conductive adhesive sheet for fixing the first circuit board and the case member, and the extending portion is brought into contact with the reference potential pattern formed on the second circuit board. By doing so, it is possible to provide a portable electronic device with improved shielding without increasing the number of components.

The best mode for carrying out the present invention will be described below with reference to the drawings.
With reference to FIG. 1, a basic structure of a mobile phone 1 as an electronic device will be described. FIG. 1 is an external perspective view in a state where the mobile phone 1 is opened.

  As shown in FIG. 1, the mobile phone 1 includes an operation unit side body 2 and a display unit side body 3 as a housing. The operation unit side body 2 and the display unit side body 3 are connected so as to be openable and closable via a connecting part 4 having a hinge mechanism. Specifically, 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 via a connecting portion 4. Thereby, the mobile phone 1 is configured to be able to relatively move the operation unit side body 2 and the display unit side body 3 connected via the hinge mechanism. That is, in the mobile phone 1, the operation unit side body 2 and the display unit side body 3 are opened (open state), and the operation unit side body 2 and the display unit side body 3 are folded. (Closed state). Here, the closed state is a state in which both housings are arranged so as to overlap each other, and the open state is a state in which both housings are arranged so as not to overlap each other.

  The outer surface of the operation unit side body 2 includes a front case 2a and a rear case 2b. The operation unit side body 2 exposes the operation key group 11 and the voice input unit 12 as a microphone to which the voice uttered by the user of the mobile phone 1 is input on the front case 2a side. Composed.

  The operation key group 11 includes a function setting operation key 13 for operating various functions such as various settings, a telephone book function, and a mail function, and an input operation key 14 for inputting a telephone number and characters such as mail. And a determination operation key 15 as an operation member for performing determination in various operations, scrolling in the vertical and horizontal directions, and the like. Each key constituting the operation key group 11 has a predetermined function according to the open / close state of the operation unit side body 2 and the display unit side body 3, various modes, or the type of the activated application. Assigned (key assignment). Then, when the user presses each key, an operation corresponding to the function assigned to each key is executed.

  The voice input unit 12 is disposed on the outer end side opposite to the connection unit 4 side in the longitudinal direction of the operation unit side body 2. That is, the voice input unit 12 is arranged on one outer end side when the mobile phone 1 is in the open state.

  An interface (not shown) for communicating with an external device (for example, a host device) is disposed on one side surface of the operation unit side body 2. A side key to which a predetermined function is assigned and an interface (not shown) through which an external memory is inserted and removed are arranged on the other side surface of the operation unit side body 2. The interface is covered with a cap. Each interface is covered with a cap when not in use.

  The outer surface of the display unit side body 3 includes a front panel 3a, a front case 3b, a rear case 3c, and a rear panel 3d. The front case 3b in the display unit side body 3 is disposed so as to expose a display unit 21 for displaying various types of information and a voice output unit 22 as a receiver for outputting the voice of the other party of the call. The Here, the display unit 21 includes a liquid crystal panel, a drive circuit that drives the liquid crystal panel, and a light source unit such as a backlight that emits light from the back side of the liquid crystal panel.

  Next, the internal structure of the operation unit side body 2 and the display unit side body 3 will be described with reference to FIGS. FIG. 2 is an exploded perspective view of members built in the operation unit side body 2. FIG. 3 is an exploded perspective view of members built in the display unit side body 3. FIG. 4 is a perspective view illustrating a structure in which the key board, the case body, and the circuit board are fixed with an adhesive sheet. FIG. 5 is a side view of FIG. 6 is a cross-sectional view taken along the line XX in FIG.

  As shown in FIG. 2, the operation unit side body 2 includes a front case 2a, a key structure 40, a key board 50 as a first circuit board, an adhesive sheet 65, and a case body 60 as a case member. A circuit board 70 as a second circuit board including various electronic components such as a reference potential pattern layer 75 and an RF (Radio Frequency) module for a mobile phone, a rear case 2b including a battery lid 2c, and a battery 80. Prepare.

  The front case 2a and the rear case 2b are disposed such that the concave inner surfaces face each other, and are joined so that the outer peripheral edges thereof overlap each other. Further, the key structure 40, the key substrate 50, the adhesive sheet 65, the case body 60, and the circuit board 70 are built in between the front case 2a and the rear case 2b. That is, the case body 60 is laminated and disposed so as to cover the circuit board 70, the key board 50 is laminated on the upper surface side of the case body 60 via the adhesive sheet 65, and the key board 50 is disposed on the upper surface of the key board 50. The structure part 40 is laminated.

  In the front case 2a, key holes 13a, 14a, and 15a as first openings are formed on the inner surface of the front case 2a facing the display unit 21 of the display unit side body 3 in a folded state. From each of the key holes 13a, 14a, 15a, the pressing surface of the function setting operation key member 13b constituting the function setting operation key 13, the pressing surface of the input operation key member 14b constituting the input operation key 14, and the determination operation key 15 The pressing surface of the determination operation key member 15b that constitutes is exposed. By pressing the exposed function setting operation key member 13b, the input operation key member 14b, and the determination operation key member 15b so as to depress, the metal dome described later is provided in each corresponding key switch 51, 52, 53. The apex of (saddle-like shape) is pressed and comes into electrical contact with the switch terminal.

  The key structure unit 40 includes an operation member 40A, a key frame 40B as a reinforcing member, and a key sheet 40C as a sheet member.

  The operation member 40A is composed of a plurality of key operation members. Specifically, it is configured by a function setting operation key member 13b, an input operation key member 14b, and a determination operation key member 15b. Each operation key member constituting the operation member 40A is bonded to the key sheet 40C with a key frame 40B described later interposed therebetween. As described above, the pressing surface of each operation key member bonded to the key sheet 40C is disposed so as to be exposed to the outside from each of the key holes 13a, 14a, 15a.

  The key frame 40B is a metallic plate-like member having a plurality of holes 14c. The key frame 40B is a reinforcing member for preventing adverse effects on the circuit board 70 and the like due to the pressing of the input operation key member 14b. The key frame 40B is a conductive member, and also functions as a member for releasing static electricity from the input operation key member 14b. The plurality of holes 14c formed in the key frame 40B are arranged so that convex portions 14d formed in the key sheet 40C described later are fitted. The input operation key member 14b is bonded to the convex portion 14d.

  The key sheet 40C is a flexible sheet-like member made of silicon rubber. As described above, a plurality of convex portions 14d are formed on the key sheet 40C. The plurality of convex portions 14d are formed on the surface of the key sheet 40C on the side where the key frame 40B is disposed. Each of the plurality of convex portions 14d is formed at a position corresponding to a key switch 52 described later.

  As shown in FIGS. 2 and 4 to 6, the key substrate 50 includes a key substrate main body portion 50A and side portions 55 formed to extend from the side of the key substrate main body portion 50A. The key board main body 50A has a plurality of key switches 51, 52, 53 arranged on the key sheet 40C side. The side part 55 has side switches 55a and 55b disposed on the same side as the surface on which the key switches 51, 52 and 53 are disposed.

  The plurality of key switches 51, 52, 53 are arranged at positions corresponding to the respective operation members 40A. The key switches 51, 52 and 53 arranged on the key substrate 50 have a structure having a metal dome of a metal plate which is curved in a bowl shape and is three-dimensionally formed. The metal dome is configured to be electrically connected to a switch terminal formed on an electric circuit (not shown) printed on the surface of the key substrate 50 when the apex of the bowl-shaped shape is pressed. Is done. The side switches 55a and 55b are formed at positions corresponding to operation members constituting a side key (not shown). The structures of the side switches 55a and 55b are the same as the structures of the key switches 51, 52 and 53. The key board 50 is obtained by sandwiching wiring between a plurality of insulating layers (insulating films).

  The key board main body 50A is placed on a flat plate 61 in a case body 60 described later with an adhesive sheet 65 interposed therebetween. Since the key substrate 50 is placed on the flat plate portion 61 of the case body 60, the pressure and bending due to the pressing of the operation members 40 </ b> A are not easily transmitted to the circuit board 70 disposed below the case body 60. The side portion 55 is disposed along the outer surface of the rib 62 in the case body 60 with an extension portion 66 (described later) in the adhesive sheet 65 interposed therebetween. The key substrate 50 is fixed to the case body 60 by an adhesive sheet 65.

  The adhesive sheet 65 is a sheet-like member that is made of a conductive material and has an adhesive material applied on both sides. The adhesive sheet 65 is a sheet-like member that has flexibility and is deformable in the thickness direction.

  As shown in FIGS. 2 and 4 to 6, the adhesive sheet 65 includes an adhesive sheet main body portion 65 </ b> A disposed on a flat plate portion 61 in a case body 60 to be described later, and a rib formed by extending from the adhesive sheet main body portion 65 </ b> A. And an extending portion 66 disposed on the outer surface of 62. By arranging the key substrate 50 on the upper surface of the adhesive sheet 65 disposed on the outer surface of the case body 60, the key substrate 50 is attached to the case body 60 via the adhesive sheet 65. The adhesive sheet main body 65 </ b> A fixes the key substrate main body 50 </ b> A of the key substrate 50 to the case body 60, and the extension 66 fixes the side portions 55 of the key substrate 50 to the ribs 62 of the case body 60.

  As shown in FIGS. 4 to 6, the end portion of the extension portion 66 is disposed so as to fit into a notch 67 formed in the rib 62 of the case body 60 described later, and on the inner surface of the rib 62. It is arranged along. The end portion of the extension portion 66 is bent inside the case body 60 to fit into the notch portion 67 and arranged along the inner surface of the rib 62. End portions of the extending portions 66 arranged so as to fit into the notches 67 are arranged so as to be sandwiched between the ribs 62 of the case body 60 and the reference potential pattern layer 75 in the circuit board 70.

  The end portion of the extending portion 66 that is fitted and arranged in the notch portion 67 is pressed by the end surface of the notch portion 67 and the circuit board 70 so as to be in the thickness direction (the extending direction of the extending portion 66). ) And is arranged so that both the end face of the notch 67 and the reference potential pattern layer 75 of the circuit board 70 are in close contact with each other.

  That is, the adhesive sheet 65 fixes the case body 60 and the circuit board 70 with a high degree of contact and without a gap. That is, the adhesive sheet 65 (extension portion 66) improves the reliability of ground conduction between the case body 60 and the circuit board 70 and improves the shielding performance against noise such as high frequency.

  The adhesive sheet 65 (extending portion 66) fixes the case body 60 and the circuit board 70 only at the portion disposed in the notch portion 67. Since the adhesive sheet 65 does not fix the case body 60 and the circuit board 70 on a wide surface, the case body 60 and the circuit board 70 can be separated again. That is, the adhesive sheet 65 fixes the case body 60 and the circuit board 70 so as to be detachable.

  As shown in FIGS. 2 and 4 to 6, the case body 60 is a conductive member having a shape in which one wide surface of a thin rectangular parallelepiped is opened. The case body 60 includes ribs 62 that are formed substantially perpendicular to the opening-side surface of the flat plate portion 61. The rib 62 is formed to be equal to or sufficiently higher than the height of the tallest electronic component among the various electronic components mounted on the circuit board 70. The rib 62 is formed so as to correspond to the reference potential pattern layer 75 constituting the reference potential portion on the periphery and inside of the flat plate portion 61. Specifically, the rib 62 is formed so as to be disposed on the reference potential pattern layer 75 in a state where the case body 60 is placed on the circuit board 70. Note that the case body 60 may be formed of a metal, a skeleton formed of a resin, and a conductor film formed on the surface thereof.

  A notch 67 is formed on the end side of the rib 62. The notch 67 is formed at a position, shape, and height corresponding to the extension 66. Specifically, the notch 67 is formed at a position corresponding to the extension 66 with a width and height that is slightly smaller than the outer shape of the extension 66. An end portion of the extended portion 66 of the adhesive sheet 65 is fitted into the cutout portion 67 and disposed.

  An adhesive sheet 65 is disposed (attached) to the case body 60 along the outer surface of the case body 60. An adhesive sheet 65 is disposed from the flat plate portion 61 to the rib 62 in the case body 60. By arranging the key substrate 50 on the upper surface of the adhesive sheet 65 disposed on the outer surface of the case body 60, the key substrate 50 is attached to the case body 60. In addition, the extending portion 66 of the adhesive sheet 65 that is fitted and arranged in the notch 67 formed in the rib 62 of the case body 60 fixes the case body 60 and the circuit board 70 in a detachable manner.

  The case body 60 is electrically connected to the reference potential pattern layer 75 by contacting the reference potential pattern layer 75 with the extending portion 66 fitted to the bottom surface of the rib and the end surface of the notch 67. . The case body 60 is electrically connected to the reference potential pattern layer 75 and has the same potential as the reference potential pattern layer 75. That is, the case body 60 functions as a shield case. The case body 60 serves as a shield case to suppress external noise such as high frequency from acting on various electronic components disposed on the circuit board 70, and to emit from an RF (Radio Frequency) circuit, a CPU circuit, a power supply circuit, and the like. This prevents the generated noise from acting on other electronic components and a receiving circuit connected to the antenna. Specifically, the bottom surface of the rib 62 in the case body 60 is disposed on the reference potential pattern layer 75, so that each circuit described later is surrounded by the rib 62 and covered with a part of the flat plate portion 61. The rib 62 functions as a partition wall in each circuit, and shields each circuit together with a part of the flat plate portion 61.

  Here, as shown in FIG. 6, the extending portion 66 fitted and disposed in the notch 67 is disposed in close contact with the end surface of the notch 67 and the reference potential pattern layer 75 of the circuit board 70. Is done. Since the extension part 66 fixes the case body 60 and the circuit board 70 without a gap, the influence of noise or the like can be reduced more suitably.

  On the circuit board 70, various electronic components and circuits (not shown) including a signal processing unit that processes signals transmitted and received by the antenna unit 108 are arranged. Various electronic components form a plurality of circuit blocks by a predetermined combination. For example, various circuit blocks including an RF (Radio Frequency) circuit, a power supply circuit, and the like are formed.

  In addition to the various electronic components described above, a reference potential pattern layer 75 constituting a reference potential portion is formed on the first surface 70a of the circuit board 70 on the case body 60 side. The reference potential pattern layer 75 is formed so as to partition each circuit block described above. The reference potential pattern layer 75 is formed by printing a conductive member in a predetermined pattern on the surface of the first surface 70a of the circuit board 70.

  A detachable battery lid 2c is provided on one end side (in FIG. 2) of the rear case 2b. After the battery 80 is stored from the outside of the rear case 2b, the battery case 2b is attached to the rear case 2b. In addition, an audio input unit 12 (not shown) for inputting the user's voice is accommodated at one end of the rear case 2b.

  As shown in FIG. 3, the display unit side body 3 includes a front panel 3a, an audio output unit 22, a front case 3b, an audio output unit 22, a display unit 21, and a print to which the display unit 21 is connected. A substrate 85, a rear case 3c, and a rear panel 3d are provided.

  The display unit side body 3 includes a front panel 3a, a front case 3b, a display unit 21, a printed circuit board 85, a rear case 3c, and a rear panel 3d that are stacked. Specifically, the front case 3b and the rear case 3c 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.

  A printed circuit board 85 to which the display unit 21 is connected is sandwiched between the front case 3b and the rear case 3c. A speaker connected to an amplifier (not shown) is connected to the printed board 85.

  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.

  A procedure for combining the key board 50, the case body 60, and the circuit board 70 will be described with reference to FIGS. FIG. 7 is a cross-sectional view illustrating a state where the key substrate is attached to the case body via the adhesive sheet. FIG. 8 is a cross-sectional view illustrating a state in which the extended portion in FIG. 7 is bent so as to be fitted into the notch portion. FIG. 9 is a cross-sectional view illustrating a state where the circuit board 70 is attached to the case body in FIG.

  First, as shown in FIG. 7, the adhesive sheet 65 is disposed on the case body 60. Specifically, the adhesive sheet main body portion 65 </ b> A is disposed on the flat plate portion 61 in the case body 60. Then, the key substrate 50 is disposed on the surface of the adhesive sheet main body 65A opposite to the case body 60 so as to be attached. As a result, the key substrate 50 is attached to the case body 60 via the adhesive sheet 65.

  Next, as shown in FIG. 8, the extending portion 66 in the adhesive sheet 65 is bent in the direction of the arrow F <b> 1. Specifically, the extension part 66 is arranged so that the base side of the extension part 66 is along the outer surface of the rib 62, and the end part of the extension part 66 is bent so as to fit into the notch part 67. Furthermore, the end portion of the extension portion 66 is bent so that the tip portion of the extension portion 66 is disposed along the inner surface of the rib 62.

  Subsequently, as shown in FIG. 9, the case body 60 is attached to the circuit board 70. In the case body 60, the end portion of the rib 62 and the extending portion 66 fitted to the notch portion 67 are disposed in contact with the reference potential pattern layer 75 in the circuit board 70. The case body 60 is detachably attached to the circuit board 70 by an extending portion 66 disposed in the notch portion 67.

  The extension 66 is disposed so as to be in close contact with the end surface of the notch 67 and the reference potential pattern layer 75. The case body 60 and the reference potential pattern layer 75 are fixed in a state where the contact degree is high via the extending portion 66 in the adhesive sheet 65. That is, the extended portion 66 of the adhesive sheet 65 can maintain ground conduction between the case body 60 and the reference potential pattern layer 75 in the circuit board 70 with high reliability. Further, the case body 60 can obtain a high shielding property by the extending portion 66 of the adhesive sheet 65. Specifically, high frequency noise and the like can be prevented from entering the case body 60, and high frequency noise generated from the electronic components covered by the case body 60 is exposed to the outside of the case body 60. Can be suppressed.

  Further, since the case body 60 is detachably attached to the circuit board 70 via the extending portion 66 of the adhesive sheet 65, the case body 60 can be separated from the circuit board 70 again during the assembly process. That is, when a defect is found in the electronic components of the circuit board 70 after the case body 60 is attached to the circuit board 70, the electronic parts can be replaced by separating the case body 60 from the circuit board 70.

  According to the present embodiment, the extending portion 66 is formed on the conductive adhesive sheet 65 that fixes the key substrate 50 and the case body 60, and the extending portion 66 is formed on the circuit board 70. Layer 75 is in contact. Accordingly, it is possible to provide the mobile phone 1 with improved shielding performance without increasing the number of conductive parts.

  Further, according to the present embodiment, the extending portion 66 of the adhesive sheet 65 is disposed between the rib 62 of the case body 60 and the reference potential pattern layer 75 of the circuit board 70. Thereby, the degree of adhesion between the case body 60 and the reference potential pattern layer 75 is improved, and the reliability in ground conduction is improved. Moreover, the shielding property in the case body 60 is improved.

  Further, according to the present embodiment, the conductive part on the housing side and the reference potential part (ground) on the circuit board 70 side can be electrically connected without using a member such as a spring contact. Thereby, the freedom degree of the design in the mobile phone 1 is improved. In addition, this makes it possible to suppress the increase in size of the circuit board 70 and to reduce the size of the mobile phone 1.

  Further, according to the present embodiment, the notch 67 into which the extension 66 is fitted is formed at the end of the rib 62, so that the extension 66 is sandwiched between the rib 62 and the circuit board 70. Even in the case of the arrangement, it is possible to suppress the floating of the case body 60 caused by the thickness of the extending portion 66. That is, it is possible to suppress a gap from being generated between the case body 60 and the circuit board 70.

  Further, according to the present embodiment, since the adhesive sheet 65 (extending portion 66) is formed of a member that can be deformed in the thickness direction (extending direction of the extending portion 66), the case body 60 and the circuit board are formed. 70 is fixed without a gap. Thereby, the shielding property in the case body 60 is improved.

  Further, according to the present embodiment, the side portion 55 corresponding to the side key formed on the key substrate 50 is disposed on the upper surface of the extending portion 66 and is fixed to the case body 60. When the side portion 55 is provided, the extension portion 66 arranged along the outer surface of the rib 62 can be used effectively, which is preferable.

  In addition, according to the present embodiment, the tip of the extending portion 66 is bent and disposed along the inner surface of the rib 62, so that the electronic component can be mounted in the vicinity of the rib 62. As a result, the electronic component can be disposed in the vicinity of the rib 62 without leaving a predetermined distance that has been necessary to prevent a short circuit, and thus the circuit board 70 can be reduced in size. Thereby, the mobile phone 1 can be reduced in size.

  In addition, according to the present embodiment, since the extension part 66 fixes the case body 60 and the circuit board 70, the number of man-hours during assembly can be reduced, and the number of parts can be reduced by reducing the temporary fixing parts and the like. Can be reduced. Moreover, since the extension part 66 fixes the case body 60 and the circuit board 70 so that attachment or detachment is possible, when replacement | exchange of electronic components etc. is required, it can isolate | separate easily.

  As mentioned above, although preferred embodiment 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 mobile phone 1 is described as a mobile electronic device. However, the present invention is not limited to this, and is not limited to this. A personal computer etc. may be sufficient.

  Further, according to this embodiment, the notch 67 is formed at the end of the rib 62, but the present invention is not limited to this, and the notch 67 may not be formed at the end of the rib 62. Good.

  Further, according to the present embodiment, the extending portion 66 of the adhesive sheet 65 is arranged to be bent to the inner surface of the rib 62, but is not limited thereto, and includes the end surface of the rib 62 (including the end surface of the notch portion 67). ) May be arranged.

  Further, according to the present embodiment, the adhesive sheet 65 is a sheet-like member in which an adhesive material is applied on both surfaces, but is not limited thereto, and a material having adhesive (adhesive) properties is formed in a sheet shape. It may be a thing.

Further, according to the present embodiment, the extending portion 66 is formed so as to be disposed on the entire outer surface of the rib 62 formed on the side surface of the case body 60, but the present invention is not limited to this. You may form so that only arrangement | positioning may be carried out.
For example, as illustrated in FIGS. 10 to 12, the extending portion 66 may be formed so as to be disposed only at a position close to an electronic component that generates noise such as a high frequency. Hereinafter, other embodiments will be described. FIG. 10 is a diagram for explaining an arrangement position of an electronic component that generates a high frequency mounted on a circuit board according to another embodiment. FIG. 11 is a diagram illustrating a bonding sheet arranged on a case body in another embodiment. FIG. 12 is a cross-sectional view illustrating a structure in which a key board, a case body, and a circuit board are fixed with an adhesive sheet in another embodiment.

  As shown in FIG. 10, electronic components that generate high frequencies are mounted on the circuit board 70. The high frequency generated from the electronic component is suppressed from leaking to the outside by the flat plate portion 61 and the rib 62 in the case body 60 as described above.

  As shown in FIG. 11, when the case body 60 is attached to the circuit board 70, the adhesive sheet 65 is formed so as to be disposed only at a position close to an electronic component that generates noise such as a high frequency. Specifically, the extension portions 66a, 66b, 66c, 66d, 66e, and 66f are formed on the adhesive sheet 65. The extending portion 66 is not formed so as to be disposed on the entire outer surface of the rib 62, but is formed so as to be disposed on a part of the outer surface of the rib 62. In other words, the extension part 66 is formed in a required size at a required position. The extending portions 66 a, 66 b, 66 c, 66 d, 66 e, 66 f are arranged so as to be fitted into the notch portions (not shown) in the rib 62 of the case body 60. The notch is also formed at a position close to an electronic component that generates noise such as high frequency.

  As shown in FIG. 12, the extending portion 66 is disposed so as to be fitted to the notch 67 in the vicinity of an electronic component that generates noise such as high frequency. As shown in FIG. 12, the extending portion is formed so as to be sandwiched between the case body 60 and the circuit board 70 at a position facing an electronic component that generates noise such as high frequency. By disposing the extending portion 66 so as to be sandwiched at a position close to an electronic component that generates noise such as high frequency, it is possible to suitably suppress leakage of noise such as high frequency to the outside. This is one of the preferred embodiments of the present invention.

  In the present embodiment, the notch 67 is formed on the end surface of the rib 62 of the case body 60 in accordance with the position, shape, and height corresponding to the extension 66, but the present invention is not limited to this. Instead, a notch may be formed in the extending portion 66 according to the position, size, and height of the end face of the rib 62 of the case body 60. For example, the case body 60 may have a convex portion formed on the end surface of the rib 62 when the mold is formed in the manufacturing process. In such a case, a cutout that matches the position, size, and height of the convex portion is formed in a portion of the extending portion 66 corresponding to the convex portion. Thereby, when the end surface of the rib 62 and the circuit board 70 are brought into contact with each other, the floating of the case body 60 caused by the convex portion can be suppressed. That is, it is possible to suppress a gap from being generated between the case body 60 and the circuit board 70.

  In addition, the shape of the extending portion 66 in the present embodiment is predetermined according to the position, shape, height, and the like of the rib 62 in the case body 60, but the present invention is not limited to this, for example, The extension portion 66 is formed so as to be detachable through the slit, and after being attached to the case body 60, the extension portion 66 can be disconnected through the slit as necessary to adjust its shape. It may be configured.

The external appearance perspective view in the state where cellular phone 1 was opened is shown. FIG. 6 is an exploded perspective view of members built in the operation unit side body 2. FIG. 5 is an exploded perspective view of members built in the display unit side body 3. It is a perspective view explaining the structure which fixed the key board | substrate, the case body, and the circuit board with the adhesive sheet. It is a side view in FIG. It is XX sectional drawing in FIG. It is sectional drawing explaining the state which attached the key board | substrate to the case body through the adhesive sheet. It is sectional drawing explaining the state bent so that the extension part in FIG. 7 might be fitted in a notch part. It is sectional drawing explaining the state which attached the circuit board 70 to the case body in FIG. It is a figure explaining the arrangement position of the electronic component which generates the high frequency mounted in the circuit board in other embodiments. It is a figure explaining the joining sheet arrange | positioned at the case body in other embodiment. It is sectional drawing explaining the structure which fixed the key board | substrate in other embodiment, the case body, and the circuit board with the adhesive sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cellular phone 2 Operation part side body 3 Display part side body 50 Key board 60 Case body 62 Rib 65 Adhesive sheet 66 Extension part 67 Notch part 70 Circuit board 75 Reference potential pattern layer

Claims (7)

A case member having conductivity;
A conductive adhesive sheet disposed on one side of the case member;
A first circuit board attached to the case member via the adhesive sheet;
A second circuit board disposed on the opposite side of the case member from the first circuit board side and having a reference potential pattern formed on the case member side;
The adhesive sheet is formed with an extending portion extending to the second circuit board side,
The extension portion is in contact with the reference potential pattern, and is a portable electronic device that fixes the case member and the second circuit board. Electronic components are mounted on the second circuit board,
The case member has a rib that is formed so as to protrude toward the second circuit board and surround the electronic component and to face the reference potential pattern;
2. The portable electronic device according to claim 1, wherein the extension part is disposed such that a part of the extension part is sandwiched between the rib and the reference potential pattern.   The portable electronic device according to claim 2, wherein the electronic component is an electronic component that generates a high frequency. The rib is formed with a notch,
4. The portable electronic device according to claim 2, wherein the extension part is arranged with a part of the extension part fitted into the notch part. 5. The first circuit board is formed with a side portion that extends to the second circuit board side and is arranged along the outer surface of the rib.
The portable electronic device according to any one of claims 2 to 4, wherein the side portion is attached to the rib via the extending portion.   The portable electronic device according to any one of claims 1 to 5, wherein the extension portion detachably fixes the second circuit board and the case member.   The portable electronic device according to any one of claims 1 to 6, wherein the extension part is configured by a member having deformability in the extension direction of the extension part.

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