JP5368133B2 - Electronics - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus which suppresses deterioration in mechanical strength of a case member while improving shielding effects of the case member. <P>SOLUTION: The electronic apparatus includes: a housing 2; a circuit board 70 which is disposed inside the housing 2 and in which a reference potential pattern 73 is formed on one surface 72 and an electronic component 71 is disposed; a conductive case member 60 which is disposed so as to cover the electronic component 71 on a side of the one surface 72 of the circuit board 70 and has a counter part 63 disposed facing the reference potential pattern 73; and a seal material 100 which is configured in an elastic deformable manner and has conductivity. The counter part 63 has a contact portion 64 coming into contact with the reference potential pattern 73 and a recessed portion 65A which is recessed away from the circuit board 70 in a thickness direction of the circuit board 70, and the seal material 100 is disposed between the recessed portion 65A and the reference potential pattern 73, and electrically connected to the recessed portion 65A and the reference potential pattern 73. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an electronic device such as a mobile phone.

  2. Description of the Related Art Conventionally, a circuit board on which a plurality of electronic components are mounted is built in a housing of an electronic device such as a mobile 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 an electronic device in which a shielding case is disposed (see, for example, Patent Document 1).

  According to the electronic device of Patent Document 1, a plurality of electronic components are covered with a shield case, and the electronic components are also isolated from each other. Therefore, noise radiated from the electronic components affects other electronic components. It is possible to prevent the function from being lowered.

JP 2006-238204 A

  On the other hand, when the case member is placed on the circuit board, a conductive sealing material may be disposed at the contact portion between the case member and the circuit board in order to enhance the shielding effect. When the sealing material disposed between the case member and the circuit board is configured to be elastically deformable, the degree of adhesion between the case member and the circuit board is improved, and the shielding effect of the case member is increased. It becomes.

  However, when the sealing material is elastically deformable, the mechanical strength of the case member may deteriorate due to the elastic deformation of the sealing material when the case member is arranged on the circuit board.

  An object of this invention is to provide the electronic device which can suppress deterioration of the mechanical strength of a case member, improving the shielding effect of a case member.

  The present invention includes a housing, a circuit board disposed inside the housing, a reference potential pattern formed on one surface and an electronic component disposed thereon, and the one surface side of the circuit board A conductive case member having a facing portion disposed to cover the electronic component and facing the reference potential pattern, and configured to be elastically deformable, and a conductive sealing material, The facing portion has a contact portion that contacts the reference potential pattern, and a recess that is recessed from the circuit board in the thickness direction of the circuit board, and the sealing material includes the recess and The present invention relates to an electronic device disposed between the reference potential pattern and electrically connected to the recess and the reference potential pattern.

  The case member includes a plate-like base portion disposed on the one surface side of the circuit board, and a rib portion formed to protrude from the base portion to the reference potential pattern side and having the facing portion. It is preferable that the facing portion is formed such that the contact portion and the concave portion are aligned in the thickness direction of the rib portion.

  Moreover, it is preferable that an electronic component is provided on the inner side of the case member in the surface direction of the circuit board, and the concave portion is formed on the outer side of the case member in the surface direction of the circuit board.

  The case member has a plurality of screw holes into which a screw member for fixing the circuit board and the case member can be screwed, and the concave portion is disposed between the adjacent screw holes. It is preferable.

  In addition, a key substrate having a key switch is disposed on a surface of the base portion opposite to a surface on which the rib portion is provided, in a thickness direction of the base portion so as not to overlap the sealing material. preferable.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic device which can suppress deterioration of the mechanical strength of a case member can be provided, improving the shielding effect of a case member.

1 is a perspective view showing a mobile phone 1 according to an embodiment of the present invention in a state where an operation unit side body 2 and a display unit side body 3 are opened. It is a disassembled perspective view of the operation part side housing | casing 2 of the mobile telephone 1 shown in FIG. FIG. 2 is a plan view showing a state in which a case member 60 is arranged on the first surface 72 side of the circuit board 70 in the mobile phone 1 shown in FIG. 1. It is the sectional view on the AA line in FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is CC sectional view taken on the line in FIG. It is the DD sectional view taken on the line in FIG. FIG. 2 is a diagram showing a state where a plurality of electronic components 71 are arranged on a first surface 72 of a circuit board 70 in the mobile phone 1 shown in FIG. 1. It is a figure which shows the case member 60 in the mobile telephone 1 shown in FIG. It is the perspective view which looked at the contact part 64 in the case member 60 shown in FIG. 9 from the opposite side to the base part 61. FIG. 10 is a perspective view of a first recess 65A in the case member 60 shown in FIG. 9 as viewed from the side opposite to the base portion 61. FIG. It is the perspective view which looked at the 2nd crevice 65B in case member 60 shown in Drawing 9 from the side opposite to base part 61. 10 is a perspective view of a third recess 65C in the case member 60 shown in FIG. 9 as viewed from the side opposite to the base portion 61. FIG.

  Hereinafter, an embodiment of the present invention will be described 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 a mobile phone 1 according to an embodiment of the present invention in a state where an operation unit side body 2 and a display unit side body 3 are opened.

  The mobile phone 1 according to the present embodiment is a foldable mobile phone, and includes a substantially rectangular parallelepiped-shaped operation unit side body 2, a substantially rectangular parallelepiped display unit side body 3, and an operation unit side body 2 and a display. And a connecting portion 4 that connects the portion side housing 3 to each other.

  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 has a front surface 2 a 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 has a back surface 2b which 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 / close state of the mobile phone 1 and the type of the activated application (key assignment). 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 arranged in the display unit side body 3, and the liquid crystal module has a display member provided on one surface of which a cover member mainly composed of a transparent portion. The display unit 33 is disposed so as to be exposed to the front surface 3a of the display unit side body 3 through an 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.

  As shown in FIG. 2, the operation unit side body 2 includes a front case 21, a key sheet 40 constituting the operation key group 11, a flexible wiring board (key board) 50, a case member 60, a circuit, A substrate 70, a main antenna 90, a rear case 22, a battery 80, and a battery cover 81 are provided.

  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 and disposed so as to cover the first surface 72 that is one surface of the circuit board 70, and the flexible wiring board 50 as a key board is laminated and arranged on the upper surface side of the case member 60. The key sheet 40 is stacked on the upper surface of the 50.

  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 base 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 expose from 21c.

  The main antenna 90 is connected to the circuit board 70 via a wiring (not shown). The main antenna 90 receives or transmits a high frequency signal.

  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.

  Next, the circuit board 70 and the case member 60 will be described in more detail with reference to FIGS. FIG. 3 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 in the mobile phone 1 shown in FIG. 4 is a cross-sectional view taken along line AA in FIG. 5 is a cross-sectional view taken along line BB in FIG. 6 is a cross-sectional view taken along line CC in FIG. 7 is a cross-sectional view taken along line DD in FIG. FIG. 8 is a diagram showing a state where a plurality of electronic components 71 are arranged on the first surface 72 of the circuit board 70 in the mobile phone 1 shown in FIG. FIG. 9 is a diagram showing a case member 60 in the mobile phone 1 shown in FIG. FIG. 10 is a perspective view of the contact portion 64 in the case member 60 shown in FIG. 9 as viewed from the side opposite to the base portion 61. 11 is a perspective view of the first recess 65A in the case member 60 shown in FIG. 9 as viewed from the side opposite to the base portion 61. As shown in FIG. 12 is a perspective view of the second recess 65B in the case member 60 shown in FIG. 9 as viewed from the side opposite to the base portion 61. As shown in FIG. FIG. 13 is a perspective view of the third recess 65 </ b> C in the case member 60 shown in FIG. 9 as viewed from the side opposite to the base portion 61.

  As shown in FIGS. 3 to 7, the case member 60 is disposed on the first surface 72 side of the circuit board 70 so as to cover the electronic component 71. The case member 60 is attached in a state of being placed on the first surface 72 of the circuit board 70 and functions as a shield case. Specifically, as shown in FIGS. 3 to 7, the contact portion 64 in the facing portion 63 of the rib portion 62 as a partition wall formed on the case member 60 contacts the first surface 72 of the circuit board 70. And it attaches in the state which the gasket 100 as a sealing material has been arrange | positioned between the 1st recessed part 65A in the opposing part 63 of the circuit board 70 and the rib part 62, the 2nd recessed part 65B, and the 3rd recessed part 65C.

  As shown in FIGS. 2 and 3, the circuit board 70 and the case member 60 as a shield case are partially fixed in a detachable manner at the plurality of connecting portions 9. Specifically, each of the plurality of circuit board side screw holes 701 formed in the circuit board 70 and each of the plurality of case member side screw holes 601 formed in the case member 60 are overlapped with each other. By screwing the screw member 700 into the fitted screw hole, the circuit board 70 and the case member 60 are partially fixed detachably.

As shown in FIG. 8, the circuit board 70 is formed in a rectangular shape. On the first surface 72 of the circuit board 70, a plurality of electronic components 71, a reference potential pattern 73, and a plurality of circuit board side screw holes 701 are arranged. The electronic component 71 is disposed inside the case member 60 in a state where the case member 60 is placed on 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) or the like provided on the circuit board 70 and inside the circuit board 70.

  A reference potential pattern 73 is formed on the first surface 72 of the circuit board 70 so as to partition the plurality of electronic components 71. The reference potential pattern 73 is formed with a predetermined width. In the present embodiment, the reference potential pattern 73 is disposed on the periphery and inside of the circuit board 70 and is disposed so as to partition the first surface 72 of the circuit board 70 into, for example, four regions. The reference potential pattern 73 is formed, for example, between a wireless circuit and a power supply circuit adjacent thereto, or between the wireless circuit and a digital circuit adjacent thereto.

  In addition, the reference potential pattern 73 has a plurality of pattern convex portions 74 that protrude side by side in the width direction of the reference potential pattern 73. The pattern protrusion 74 is formed along the wiring direction of the reference potential pattern 73 and has a rectangular shape that is long in the wiring direction of the reference potential pattern 73. Further, the pattern convex portion 74 is disposed between the circuit board side screw holes 701 and 701 adjacent in the wiring direction of the reference potential pattern 73.

  As shown in FIG. 9, the case member 60 is formed in a rectangular shape when viewed from the thickness direction of the circuit board 70. The case member 60 has a thin rectangular parallelepiped shape with an open surface on the circuit board 70 side. The case member 60 is at least partially made of a metal material and has conductivity.

  As shown in FIG. 9, the case member 60 includes a plate-like base portion 61 that constitutes the upper surface, a rib portion 62 that is formed to project from the base portion 61 toward the reference potential pattern 73 side at a substantially right angle, and a circuit. A plurality of case member side screw holes 601 into which a screw member 700 for fixing the substrate 70 and the case member 60 can be screwed. The rib part 62 is provided on the outer edge and the inner side of the base part 61. The rib portion 62 is formed so as to partition the region of the base portion 61. The rib portion 62 has a predetermined thickness and is formed to extend in the surface direction of the base portion 61. Here, in the mobile phone 1 of the present embodiment, the direction extending in the surface direction of the base portion 61 in the rib portion 62 is referred to as “direction X in which the rib portion 62 extends”.

  The case member side screw holes 601 are formed at positions where the four corners of the base portion 61 and the rib portions 62 intersect each other.

The rib portion 62 is formed so as to correspond to the reference potential pattern 73 provided on the circuit board 70 as shown in FIGS. 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.

  The rib portion 62 has a facing portion 63 formed corresponding to the reference potential pattern 73. The facing portion 63 is formed on the end portion (end surface) of the rib portion 62 opposite to the base portion 61. In a state where the case member 60 is placed on the circuit board 70, the facing portion 63 is disposed so as to face the reference potential pattern 73.

  As shown in FIGS. 4 to 7 and FIGS. 10 to 13, the facing portion 63 includes a contact portion 64 that can come into contact with the reference potential pattern 73, and a recess spaced from the circuit board 70 in the thickness direction of the circuit board 70. A plurality of first recesses 65A, second recesses 65B, and third recesses 65C.

The contact portion 64 has a surface portion that faces and contacts the reference potential pattern 73. Each of the first recess 65A, the second recess 65B, and the third recess 65C has a bottom surface that faces the circuit board 70 and is spaced apart in the thickness direction of the circuit board 70, and includes a general non-concave part. The bottom surfaces of the first recess 65 </ b> A, the second recess 65 </ b> B, and the third recess 65 </ b> C constitute a step surface as a step portion that is separated from the surface portion of the contact portion 64 in the thickness direction of the circuit board 70.
As shown in FIG. 9, the plurality of first recesses 65 </ b> A, second recesses 65 </ b> B, and third recesses 65 </ b> C are formed between adjacent case member-side screw holes 601, 601 in the case member 60 in the direction X in which the rib portion 62 extends. Formed between.

  As shown in FIGS. 4 and 10, the contact portion 64 in the facing portion 63 is formed at a position where the rib portion 62 protrudes most from the base portion 61 toward the reference potential pattern 73 side. The contact portions 64 are arranged so as to be arranged on a plane parallel to the base portion 61. The contact portion 64 directly contacts the reference potential pattern 73 on the circuit board 70 in a state where the case member 60 is placed on the circuit board 70. The case member 60 is electrically connected to the reference potential pattern 73 on the circuit board 70 through the contact portion 64.

  As shown in FIGS. 5 to 7, the first recess 65 </ b> A, the second recess 65 </ b> B, and the third recess 65 </ b> C are formed in the rib portion 62 rather than the protrusion of the contact portion 64 from the base portion 61 toward the reference potential pattern 73 side. It is formed at a short protruding position. That is, the first recess 65A, the second recess 65B, and the third recess 65C are formed so as to be recessed from the contact portion 64 to the base portion 61 side. As described above, the first recess 65 </ b> A, the second recess 65 </ b> B, and the third recess 65 </ b> C are configured as stepped portions that are separated from the contact portion 64 in the thickness direction of the circuit board 70.

  As shown in FIGS. 3, 5, and 11, the first recess 65 </ b> A is formed so as to be recessed toward the base portion 61 over the entire thickness direction of the rib portion 62. Specifically, the first recess 65 </ b> A has a width of the facing portion 63 formed so as to extend linearly in the extending direction X of the rib portion 62 in the rib portion 62 formed along the outer edge of the base portion 61. It is formed between the contact portion 64 and the contact portion 64 so that the entire region is depressed in the middle.

  As shown in FIGS. 3, 6, and 12, the second recess 65 </ b> B is formed side by side with the contact portion 64 in the thickness direction of the rib portion 62. The second recess 65 </ b> B is formed on the inner side of the case member 60 in the surface direction of the circuit board 70. An electronic component 71 is disposed on the inner side of the case member 60 in the surface direction of the circuit board 70. Specifically, the second recess 65B is formed side by side along the contact portion 64 that is continuously formed so as to extend linearly in the direction X in which the rib portion 62 extends, and the direction X in which the rib portion 62 extends. It has a long shape. The second recess 65 </ b> B is formed on the inner side of the case member 60, and the electronic component 71 is disposed on the second recess 65 </ b> B side in the rib portion 62.

  Further, as shown in FIGS. 3, 7, and 13, the third recess 65 </ b> C is formed side by side with the contact portion 64 in the thickness direction of the rib portion 62. The third recess 65 </ b> C is formed on the outer side of the case member 60 in the surface direction of the circuit board 70. An electronic component 71 is disposed on the inner side of the case member 60 in the surface direction of the circuit board 70. Specifically, the third recess 65 </ b> C is formed such that a partial region of the width of the facing portion 63 formed so as to extend linearly in the extending direction X of the rib portion 62 is recessed in the middle. The contact portion 64 is continuously formed so as to extend in the extending direction X of the rib portion 62, and is formed along the outer edge of the bottom surface portion of the third recess 65C. The third recess 65 </ b> C is formed on the outer side of the case member 60, and the electronic component 71 is disposed on the opposite side of the rib portion 62 from the third recess 65 </ b> C.

  As shown in FIGS. 11 to 13, a gasket 100 as a sealing material is disposed between the bottom surface of each of the first recess 65 </ b> A, the second recess 65 </ b> B, and the third recess 65 </ b> C and the circuit board 70. In the present embodiment, the gasket 100 is made of, for example, a conductive and highly adhesive sealing material. Moreover, the gasket 100 is comprised with the material which expresses a restoring force. The material that expresses the restoring force is constituted by an elastic member (a member configured to be elastically deformable) having an elastic force. The material that develops the restoring force is disposed between the circuit board 70 and the bottom surface of each of the first recess 65A, the second recess 65B, and the third recess 65C in a state having elasticity. The gasket includes, for example, a sealing material having a shielding effect formed of a liquid silicon resin.

  As shown in FIGS. 5 to 7, the gasket 100 is stacked on the reference potential pattern 73. The first recess 65 </ b> A is stacked on the gasket 100 stacked on the reference potential pattern 73. The second recess 65 </ b> B is stacked on the gasket 100 stacked on the pattern protrusion 74 in the reference potential pattern 73. The third recesses 65 </ b> C are stacked on the gaskets stacked on the pattern protrusions 74 in the reference potential pattern 73.

  In the state where the contact portion 64 of the case member 60 is in contact with the reference potential pattern 73, the gasket 100 and the bottom surfaces of the reference potential pattern 73 and the first recess 65A, the second recess 65B, and the third recess 65C, respectively. It is sandwiched between. The gasket 100 electrically connects the first recess 65A, the second recess 65B, and the third recess 65C with the reference potential pattern 73. Further, since the gasket 100 is configured to be elastically deformable by a material that develops a restoring force, the gasket 100 is deformed into a flat shape so as to correspond to the reference potential pattern 73, and reliable contact between the reference potential pattern 73 and the rib portion 62 is achieved. Contribute to.

  Further, as shown in FIG. 2, the gasket 100 disposed on the reference potential pattern 73 is disposed at a position that does not overlap the plurality of key switches 51, 52, 53 described above in the thickness direction of the case member 60.

Here, a procedure for attaching the case member 60 to the circuit board 70 will be described.
First, as shown in FIGS. 11 to 13, the gasket 100 is disposed in the first recess 65 </ b> A, the second recess 65 </ b> B, and the third recess 65 </ b> C in the case member 60. The gasket 100 is disposed on the first recess 65A, the second recess 65B, and the third recess 65C so as to rise from the surface portion of the contact portion 64 in the facing portion 63 to the side opposite to the base portion 61.

  Then, the case member 60 is arranged on the circuit board 70 so that the contact portion 64 in the facing portion 63 contacts the reference potential pattern 73. The gasket 100 is sandwiched between the reference potential pattern 73 and the first recess 65A, the second recess 65B, or the third recess 65C. In this case, since the gasket 100 is raised from the surface portion of the contact portion 64 to the side opposite to the base portion 61, the circuit board 70 and the case member 60 are deformed in the thickness direction of the circuit board 70. On the other hand, the gasket 100 is deformed so as to follow the circuit board 70 and the case member 60.

  As a result, the gasket 100 brings the case member 60 and the circuit board 70 into close contact. The circuit board 70 and the case member 60 are deformed so as to return to the direction in which the case member 60 and the circuit board 70 come into contact with each other. In this case, the amount of the gasket 100 is set in consideration of the fact that the gasket 100 is deformed by the restoring force. In the portion where the gasket 100 is arranged, the case member 60 and the circuit board 70 are brought into close contact with each other. In the part which is not arrange | positioned, it adjusts suitably to the quantity which the contact part 64 contacts the circuit board 70. FIG.

  Then, as shown in FIGS. 3 to 7, the case member 60 is disposed such that the rib portion 62 of the case member 60 faces the first surface 72 of the circuit board 70. The case member 60 is disposed so that the gasket 100 disposed in the first recess 65 </ b> A is disposed on the reference potential pattern 73 of the circuit board 70. The case member 60 is disposed so that each of the gaskets 100 disposed in the second recess 65B and the third recess 65C is disposed on the corresponding pattern protrusion 74.

  Next, the case member 60 is arranged such that each of the plurality of case member side screw holes 601 of the case member 60 overlaps each of the circuit board side screw holes 701 formed in the circuit board 70. Then, by inserting the screw member 700 into the overlapping screw hole from the first surface 72 side of the circuit board 70 and screwing the screw member 700, the circuit board 70 and the case member 60 are partially detachably fixed.

  Thus, by fixing the circuit board 70 and the case member 60, the opposing portion of the case member 60 is such that the contact portion 64 contacts the reference potential pattern 73, and the first recess 65 </ b> A, the second recess 65 </ b> B, and the second The gaskets 100 stacked in the three recesses 65 </ b> C are disposed so as to contact the reference potential pattern 73. In this case, the gasket 100 is pressed by the reference potential pattern 73 and the reference potential pattern 73 side is deformed into a planar shape. Further, since the gasket 100 is configured to be deformable by a material that develops a restoring force, the gasket 100 is deformed so as to follow the circuit board 70 and the case member 60 as described above. As a result, the gasket 100 brings the case member 60 and the circuit board 70 into close contact with each other and contributes to reliable contact between the reference potential pattern 73 and the rib portion 62.

  The contact part 64 contacts the reference potential pattern 73 and is electrically connected to the reference potential pattern 73. The first recess 65A, the second recess 65B, and the third recess 65C are electrically connected to the reference potential pattern 73 via the gasket 100 disposed on the bottom surface of the first recess 65A, the second recess 65B, and the third recess 65C. Connected.

  Thus, the case member 60 described above is disposed on the first surface 72 side of the circuit board 70 so that the rib portion 62 is positioned on the reference potential pattern 73. As a result, the plurality of electronic components 71 are surrounded by the rib portion 62 and covered by the base portion 61.

  The case member 60 is electrically connected to the reference potential pattern 73 with the facing portion 63 of the rib portion 62 in direct or indirect contact with the reference potential pattern 73 of the circuit board 70. The case member 60 has the same potential as the reference potential pattern 73. That is, the case member 60 functions as a shield case.

  Specifically, the contact portion 64 is in direct contact with the reference potential pattern 73 and is electrically connected to the reference potential pattern 73. The bottom surfaces of the first recess 65A, the second recess 65B, and the third recess 65C are reliably electrically connected to the reference potential pattern 73 via the gasket 100. As a result, the case member 60 and the reference potential pattern 73 of the circuit board 70 are electrically connected, and the case member 60 functions as a shield case.

The case member 60 placed on the circuit board 70 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 to perform RF (Radio Frequency). ) Blocks noise radiated from a plurality of electronic components 71 mounted on a circuit board such as a circuit, a CPU circuit, and a power supply circuit, and acts on other electronic components, a receiving circuit connected to the main antenna 90, and the like. To suppress that.
That is, the rib portion 62 functions as a partition wall that partitions the plurality of electronic components 71, and shields noise emitted from other electronic components 71 mounted on the circuit board 70 together with the base portion 61.

  Further, the case member 60 is configured to be in direct contact with the circuit board 70 at the contact portion 64, and to be deformable by a material that develops restoring force at the first recess 65A, the second recess 65B, and the third recess 65C. They are in contact via a gasket 100 as a sealing material. Therefore, the degree of adhesion between the case member 60 and the reference potential pattern 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.
According to the present embodiment, the facing portion 63 of the case member 60 is recessed away from the contact portion 64 that can contact the reference potential pattern 73 on the circuit board 70 and the circuit board 70 in the thickness direction of the circuit board 70. A first recess 65A. The elastically deformable gasket 100 is arranged between the first recess 65A and the reference potential pattern 73 and is electrically connected to the first recess 65A and the reference potential pattern 73.

  Therefore, the cellular telephone device 1 according to the present embodiment can prevent deterioration of the function of the electrical component due to noise (enhance the shielding effect of the case member 60), and can arrange the case member 60 on the circuit board 70 in a stable state. it can. Specifically, since the case member 60 has more portions that are in contact with the contact portion 64 than when the gasket 100 is disposed in the entire area of the facing portion 63, the mechanical strength can be improved. Further, since the case member 60 and the reference potential pattern 73 of the circuit board 70 are electrically connected by the contact portion 64 and the gasket 100, the case member 60 functions as a shield case.

Further, the gasket 100 is disposed in a part of the facing portion 63. Therefore, the cost can be reduced as compared with the case where the gasket 100 is disposed in the entire area of the facing portion 63.
Further, when the case member 60 is removed from the circuit board 70, the gasket 100 can be easily disposed, so that maintainability can be improved.
In addition, since the case member 60 can be stably disposed on the circuit board 70, screw members and the like for fixing the case member 60 and the circuit board 70 can be reduced. Therefore, the cost required for a screw member or the like for fixing the case member 60 and the circuit board 70 can be reduced.

  Further, according to the present embodiment, the case member 60 is formed so as to protrude from the base portion 61 toward the reference potential pattern 73 side, with the plate-like base portion 61 disposed on the first surface 72 side of the circuit board 70. And a rib portion 62 having a facing portion 63, and the facing portion 63 is formed such that the contact portion 64 and the second recess 65 </ b> B are aligned in the thickness direction of the rib portion 62. Therefore, the facing part 63 allows the case member 60 to simultaneously obtain the effects of the contact with the reference potential pattern 73 by the contact part 64 in a stable state and the improvement in the degree of adhesion with the reference potential pattern 73 by the gasket 100. it can. Therefore, it is possible to prevent the function of the electrical component from being deteriorated due to noise, and to arrange the case member 60 on the circuit board 70 in a more stable state.

  Moreover, the opposing part 63 has the contact part 64 and the 2nd recessed part 65B formed in 2 layers along with the thickness direction of the rib part 62, and can obtain a high shield effect. Therefore, on the circuit board 70, it becomes easy to place the electronic component 71 that radiates noise at a position in the vicinity where the contact portion 64 and the second recess 65B are formed side by side. The degree of freedom of the mounting layout can be improved.

  In addition, according to the present embodiment, the mobile phone 1 includes the electronic component 71 on the inner side of the case member 60 in the surface direction of the circuit board 70, and the third recess 65 </ b> C is the case member 60 in the surface direction of the circuit board 70. It is formed on the outside side. Therefore, even when the gasket 100 is dropped due to breakage or peeling, the contact of the gasket 100 with the electronic component 71 on the circuit board 70 can be prevented.

  In addition, according to the present embodiment, the gasket 100 is configured to be deformable by a material that exhibits a restoring force. That is, the case member 60 is configured to be in direct contact with the circuit board 70 at the contact portion 64, and to be deformable by a material that develops restoring force at the first recess 65A, the second recess 65B, and the third recess 65C. They are in contact via a gasket 100 as a sealing material. Therefore, since the gasket 100 is deformed so as to follow the circuit board 70 and the case member 60, the adhesion between the case member 60 and the reference potential pattern 73 formed on the circuit board 70 is improved, and the shielding of the case member 60 is performed. The effect is improved.

  Further, according to the present embodiment, the case member 60 has the plurality of case member-side screw holes 601 into which the screw member 700 for fixing the circuit board 70 and the case member 60 can be screwed, and the first recess 65A, The second recess 65B and the third recess 65C are disposed between a plurality of adjacent case member-side screw holes 601 in the extending direction X of the rib portion 62. Therefore, the case member 60 and the circuit board 70 can be closely attached and fixed at a portion where a gap is easily formed without being fixed to the screw member 700. Therefore, the degree of adhesion between the case member 60 and the reference potential pattern 73 formed on the circuit board 70 is improved, and the shielding effect of the case member 60 is improved.

  Further, according to the present embodiment, the gasket 100 is disposed at a position that does not overlap the plurality of key switches 51, 52, 53 in the thickness direction of the case member 60. Therefore, it is possible to prevent the click feeling when the plurality of key switches 51, 52, 53 are pressed from being damaged.

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, the first recess 65A, the second recess 65B, and the third recess 65C are provided in the same case member 60 in the above-described embodiment, but are not limited thereto. For example, the first recess 65A, the second recess 65B, and the third recess 65C may be configured to be provided in the case member 60 only in any one.

  Further, the case member 60 is provided in the operation unit side body 2 in the above-described embodiment, but is not limited thereto, and may be provided in the display unit side body 3.

  In the above-described embodiment, the cellular phone 1 that can be folded by the connecting portion 4 has been described. However, the cellular phone 1 is not foldable, and the operation unit side body 2 and the display unit side body 3 are not connected to each other. One of the cases centered on an axis along the direction in which the operation unit side case 2 and the display unit side case 3 are overlapped, or a slide type in which one case is slid in one direction from the overlapped state. A rotation (turn) type that rotates the display unit, or a type (straight type) in which the operation unit side body 2 and the display unit side body 3 are arranged in one case and do not have a connecting portion.

  In the above-described embodiment, the present invention is applied to a mobile phone, but the present invention is not limited to this. The present invention can be applied to electronic devices other than portable electronic devices such as PHS (registered trademark), PDA (Personal Digital Assistant), portable navigation devices, and notebook personal computers.

1 Mobile phone (electronic equipment)
2 Operation unit side case (case)
3 Display unit side case 60 Case member 61 Base unit 62 Rib unit 63 Opposing unit 64 Contact unit 65A First recess 65B Second recess 65C Third recess 70 Circuit board 72 First surface (one surface)
73 Reference potential pattern 100 Gasket (seal material)

Claims (3)

A housing,
A circuit board that is disposed inside the housing, has a reference potential pattern formed on one surface, and has electronic components disposed thereon,
A conductive case member disposed on the one surface side of the circuit board so as to cover the electronic component and having a facing portion disposed to face the reference potential pattern;
A sealing material configured to be elastically deformable and having conductivity;
With
The opposing portion has a contact portion that contacts the reference potential pattern, and a recess that is recessed from the circuit board in the thickness direction of the circuit board,
The sealing material is disposed between the recess and the reference potential pattern and is electrically connected to the recess and the reference potential pattern,
The case member includes a plate-like base portion disposed on the one surface side of the circuit board, a rib portion formed to protrude from the base portion to the reference potential pattern side and having the facing portion, Have
The opposing portion is formed such that the contact portion and the concave portion are aligned in the thickness direction of the rib portion,
An electronic apparatus in which a key substrate having a key switch is disposed on a surface of the base portion opposite to a surface on which the rib portion is provided, in a position not overlapping with the sealing material in the thickness direction of the base portion. An electronic component is provided on the inner side of the case member in the surface direction of the circuit board,
The electronic device according to claim 1 , wherein the concave portion is formed on an outer side of the case member in a surface direction of the circuit board. A housing,
A circuit board that is disposed inside the housing, has a reference potential pattern formed on one surface, and has electronic components disposed thereon,
A conductive case member disposed on the one surface side of the circuit board so as to cover the electronic component and having a facing portion disposed to face the reference potential pattern;
A sealing material configured to be elastically deformable and having conductivity;
With
The opposing portion has a contact portion that contacts the reference potential pattern, and a recess that is recessed from the circuit board in the thickness direction of the circuit board,
The sealing material is disposed between the recess and the reference potential pattern and is electrically connected to the recess and the reference potential pattern,
The case member has a plurality of screw holes into which a screw member for fixing the circuit board and the case member can be screwed,
The concave portion is disposed between the adjacent screw holes,
An electronic device in which a key substrate having a key switch is disposed on a surface of the base portion opposite to the surface on which the rib portion is provided, in a thickness direction of the base portion so as not to overlap the sealing material.

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