JP2007266530A - Electronic device and assembly method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic device in which shield cases can be easily and efficiently mounted onto a circuit board, and its assembly method. <P>SOLUTION: An electronic device 1 houses a circuit board 15 and shield cases 14 and 16, arranged so as to cover at least part of the circuit board 15, in a cabinet 7 structured by putting together two facing case components 11 and 12, wherein the circuit board 15 and the shield cases 14 and 16 are engaged by an engaging member 30 for engaging two case components 11 and 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electronic device such as a mobile phone, a PDA (Personal Digital Assistant), a notebook personal computer, and an assembling method thereof.

Circuit boards housed in the casings of electronic devices such as mobile phones, PDAs (Personal Digital Assistants), and notebook computers are used to protect electronic components mounted on the circuit boards from noise or to prevent external noise. A shield case is attached to prevent diffusion.
The shield case is fixed to the circuit board and electrically connected by soldering to the circuit board.
A technique for improving productivity and workability by screwing a shield case to a circuit board instead of soldering is also disclosed (see Patent Document 1).
JP 2001-77577 A

  However, in the above-described technique, the shield case is screwed to the circuit board at a plurality of locations, so that a large number of screws are required, and thus there is a problem that productivity and workability cannot always be improved.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to propose an electronic device and an assembling method thereof that can easily and efficiently attach a shield case to a circuit board.

In the electronic apparatus and the assembling method thereof according to the present invention, the following means are adopted in order to solve the above problems.
In the first invention, a circuit board and a shield case arranged so as to cover at least a part of the circuit board are accommodated in a housing configured by combining two case parts facing each other. In the electronic apparatus, the circuit board and the shield case are fastened together by a fastening member that fastens the two case parts.

Further, the circuit board and the shield case each have an insertion portion for inserting the fastening member, and are electrically connected via the insertion portion.
In addition, the shield case includes a fixing unit that engages with the circuit board and can maintain the state.
The shield case includes a first shield case covering a first surface of the circuit board and a second shield case covering a second surface facing away from the first surface.
The first shield case and the second shield case include a fixing unit capable of maintaining a state in which the circuit board is sandwiched.
The fixing means includes a protrusion formed on one of the first shield case and the second shield case, and an engagement receiving portion that engages with the protrusion formed on the other. And

  In the second invention, a circuit board and a shield case arranged so as to cover at least a part of the circuit board are accommodated in a housing configured by combining two opposing case components. In the method of assembling an electronic device, the fixing means formed on the shield case is engaged and fixed to the circuit board, and the two case components, the circuit board, and the shield case are fastened together by a common fastening member. And a step of performing.

  Further, in an assembling method of an electronic device that accommodates a circuit board and two shield cases respectively disposed on both surfaces of the circuit board in a housing configured by combining two opposing case components, Fixing the two shield cases with the circuit board sandwiched between them by a fixing means formed on the two shield cases, and fastening the two case components, the circuit board and the two shield cases in common And a step of fastening together with a member.

According to the present invention, the following effects can be obtained.
Since the shield case and the circuit board 15 are fastened together by the fastening member that fastens the two case parts, the number of parts of the electronic device can be reduced, and the assembly workability can be improved.

Embodiments of an electronic apparatus and an assembling method thereof according to the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing an appearance of a mobile phone 1 according to this embodiment of the present invention.
The cellular phone 1 includes a first housing 4 having a display unit 2 and a speaker 3 for displaying various information, and a second housing 7 having a key operation unit 5 and a microphone 6 for receiving an operation from a user. .
The first housing 4 and the second housing 7 are connected to each other through hinge portions 8 so that the one end portions can be opened and closed. Thereby, the mobile phone 1 can be folded in a state in which the first casing 4 and the second casing 7 are overlapped in the respective thickness directions.

FIG. 2 is an exploded perspective view showing the configuration of the second housing 7.
The second housing 7 is assembled by overlapping the front case part 11 and the rear case part 12 in the thickness direction. In the second housing 7, the key operation unit 5, the upper shield case 14, the circuit board 15, and the lower shield case 16 are disposed so as to overlap from the front case component 11 side.
The front case part 11 and the rear case part 12 are assembled by fastening with fixing screws 30 at a plurality of locations. Specifically, a boss 11b (see FIG. 3) having a female screw is formed on the inner surface side of the front case component 11, while a boss 12b having a screw insertion hole is formed on the inner surface side of the rear case component 12. Is formed. The boss 11b and the boss 12b are formed at positions facing each other when the front case component 11 and the rear case component 12 are overlapped. Therefore, the front case component 11 and the rear case component 12 are fastened by inserting the fixing screw 30 into the boss 11b of the rear case component 12 and further screwing into the boss 11b of the front case component 11. Yes.

Various electronic components 18 are mounted on the front and back surfaces of the circuit board 15, respectively. Specifically, the electronic component 18 includes various elements such as a transistor and a capacitor constituting a wireless communication unit, and various elements such as a CPU constituting a control unit.
Screw insertion holes 15 h for inserting fixing screws 30 are formed at the four corners of the circuit board 15. The four screw insertion holes 15h are formed at positions corresponding to the boss 11b of the front case component 11 and the boss 11b of the rear case component 12, respectively.
Further, the circuit board 15 has a reference potential pattern 19 formed in the peripheral regions of the front and back surfaces so as to surround these electronic components 18. The reference potential patterns 19 are also formed on the upper and lower surfaces of the screw insertion holes 15 h formed at the four corners of the circuit board 15.

The upper shield case 14 and the lower shield case 16 are each made of a metal member having conductivity, and are configured by flat plate portions 14a and 16a and wall portions 14b and 16b, respectively. The upper shield case 14 and the lower shield case 16 are formed in a box shape having an opening on the circuit board 15 side. The upper shield case 14 covers the surface 15a of the circuit board 15, and the lower shield case 16 Covers the back surface 15b.
Screw insertion holes 14h and 16h for inserting fixing screws 30 are formed at the four corners of the upper shield case 14 and the lower shield case 16, respectively. The screw insertion holes 14 h and 16 h are formed to correspond to the screw insertion holes 15 h provided at the four corners of the circuit board 15.
The upper shield case 14 and the lower shield case 16 are not limited to metal ones. For example, the flat plate portions 14a and 16a are formed of metal, the wall portions 14b and 16b are formed of plastic or resin, and after both are bonded with an adhesive, the walls 14b and 16b are covered with a conductive layer, or the upper side The entirety of the shield case 14 and the lower shield case 16 may be made of plastic or resin and covered with a conductive layer. Note that when plastic or resin is used for the wall portions 14b and 16b, a structure for bending the claw portion 24 as shown in FIG.

  The key operation unit 5 includes a key substrate 13 on which key switches 13a corresponding to the plurality of key buttons 5a are formed. The key board 13 is provided between the front case component 11 and the upper shield case 14, and has a key switch 13a on the surface thereof. The key switch 13a is provided corresponding to the key button 5a of the key operation unit 5, and is operated when the key button 5a is pressed.

FIG. 3 is an assembly cross-sectional view of the mobile phone 1.
The second housing 7 is assembled by superimposing the front case component 11 and the rear case component 12 in the thickness direction, and screwing a fixing screw 30 into the boss 11b and the boss 11b. Between the boss 11b and the boss 12b, the upper shield case 14, the circuit board 15, and the lower shield case 16 are arranged so as to overlap each other, and are fastened to the front case component 11 and the rear case component 12 by screws 30. It has become. That is, in the mobile phone 1, the upper shield case 14 and the lower shield case 16 are fixed together with the circuit board 15 by the screws 30 for fastening the front case component 11 and the rear case component 12. .
Therefore, there is no screw for directly fixing the upper shield case 14 and the lower shield case 16 to the circuit board 15, and it is necessary to solder the upper shield case 14 and the lower shield case 16 to the circuit board 15. Nor. Therefore, the number of parts of the mobile phone 1 is reduced, and the workability of assembling the mobile phone 1 is improved, and high production efficiency is realized.
Further, since the reference potential pattern 19 is formed in the screw insertion hole 15h of the circuit board 15, the upper shield case 14, the lower shield case 16, and the upper shield case 14 and the lower shield case 16 are overlapped and fastened together. The electrical connection between the side shield case 16 and the circuit board 15 is also ensured.

FIG. 4 is a view showing a structure for fixing the metal upper shield case 14 and the lower shield case 16 to the circuit board 15.
As described above, the upper shield case 14, the circuit board 15, and the lower shield case 16 are disposed so as to overlap between the front case component 11 and the rear case component 12, and are fastened together with screws 30.
In order to realize such a configuration, when the cellular phone 1 is assembled, the screw insertion hole 15h of the circuit board 15, the screw insertion hole 14h of the upper shield case 14, and the screw insertion hole 16h of the lower shield case 16 are provided. The screw insertion holes 14h, 15h, and 16h are further aligned with the boss 11b of the front case part 11 and the boss 12b of the rear case part 12 while maintaining the state of overlapping, and the screw 30 It is preferable to perform the operation of inserting the.
Therefore, the upper shield case 14 and the lower shield case 16 are provided with a fixing means 20 as a fixing means so that the upper shield case 14, the circuit board 15 and the lower shield case 16 are shared by the front case component 11 and the rear case component 12. Prior to tightening, they can remain aligned.

As shown in FIG. 4A, the circuit board 15 has a notch 23 formed therein. The fixing means 20 includes an engagement hole 21 formed in the upper shield case 14, and a claw portion 24 and an engagement convex portion 25 formed in the lower shield case 16.
The engagement holes 21 of the upper shield case 14 are formed at a plurality of locations on the wall portion 14 b of the upper shield case 14. On the other hand, the claw portion 24 of the lower shield case 16 is a portion having elasticity protruding from the plurality of locations of the wall portion 16 b of the lower shield case 16 toward the circuit board 15, and the engagement hole 21 of the upper shield case 14. It is formed in the position corresponding to. Each claw portion 24 is formed with an engaging convex portion 25, and the engaging convex portion 25 can be fitted into the engaging hole 21 formed in the wall portion 14 b of the upper shield case 14. Yes.
The flat plate portion 14 a of the upper shield case 14 is formed with a slit hole 22 through which the claw portion 24 of the lower shield case 16 is inserted. The slit hole 22 is formed at a position corresponding to the engagement hole 21 on the outer edge of the flat plate portion 14a.
Similarly, a cutout portion 23 through which the claw portion 24 of the lower shield case 16 is inserted is formed on the outer edge of the circuit board 15.

Next, a procedure for fixing the upper shield case 14, the circuit board 15, and the lower shield case 16 will be described.
First, the claw portion 24 of the lower shield case 16 is inserted into the notch portion 23 formed on the outer edge of the circuit board 15 so that the circuit board 15 and the lower shield case 16 are overlapped.
Next, the upper shield case 14 is disposed on the front surface 15a side of the circuit board 15, and the claw portion 24 of the lower shield case 16 that protrudes toward the front surface 15a is formed on the flat plate portion 14a of the upper shield case 14. The slit hole 22 is inserted.
Further, by overlapping the circuit board 15 and the upper shield case 14, the engagement convex portion 25 formed in the claw portion 24 and the engagement hole 21 formed in the wall portion 14 b of the upper shield case 14 are fitted together. The Thereby, the upper shield case 14 and the lower shield case 16 are engaged. At this time, the claw portion 24 of the lower shield case 16 is also engaged with the cutout portion 23 formed on the outer edge of the circuit board 15, so that the upper shield case 14, the circuit board 15, and the lower shield case 16 are Fixed.

Finally, as shown in FIG. 4B, the claw portion 24 of the lower shield case 16 that is in a state of protruding from the slit hole 22 formed in the flat plate portion 14a of the upper shield case 14 is bent inward. Then, the upper shield case 14 is brought into close contact with the flat plate portion 14a. As a result, the upper shield case 14, the circuit board 15, and the lower shield case 16 cannot be easily removed.
As described above, when the upper shield case 14 and the lower shield case 16 are fixed to the circuit board 15, it is not necessary to use screws or to perform soldering, thereby reducing the number of parts and the number of manufacturing steps. be able to.
Then, the three fixed members (upper shield case 14, circuit board 15 and lower shield case 16) are arranged between the front case component 11 and the rear case component 12, and are fastened together with screws 30. Thus, the mobile phone 1 is assembled. By the joint fastening, the three members are firmly fixed, and the reference potential pattern 19 formed in the screw insertion hole 15h of the circuit board 15, and the upper shield case 14 and the lower shield case 16 are electrically connected. Connected.

  As described above, according to the embodiment of the present invention, the upper shield case 14 and the lower shield case 16 can be easily and reliably fixed to the circuit board 15. Further, since the upper shield case 14, the circuit board 15, and the lower shield case 16 are fastened together with the screws 30 that fasten the front case component 11 and the rear case component 12, the number of components of the mobile phone 1 can be reduced. In addition, the assembling workability of the mobile phone 1 is improved, and high production efficiency can be realized. According to the present embodiment, the upper shield case 14 and the lower shield case 16 and the circuit board 15 can be electrically connected by fastening together as described above without using soldering or the like. The connection is strong and secure.

  Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, although the case where the electrical connection between the upper shield case 14 and the lower shield case 16 and the circuit board 15 is performed via the screw insertion holes 14, 15h, and 16h has been described, the present invention is not limited thereto. A ground contact having a leaf spring mechanism is mounted on the reference potential pattern 19 of the circuit board 15, and this ground contact is brought into contact with the flat plate portions 14 a and 16 a of the upper shield case 14 and the lower shield case 16, thereby The shield case 14 and the lower shield case 16 may be electrically connected to the circuit board 15. Alternatively, the ground contact may be mounted on the upper shield case 14 and the lower shield case 16 in advance, and the ground contact may be brought into contact with the reference potential pattern 19 of the circuit board 15 to be electrically connected. Good.

  Moreover, although the case where the shield cases 14 and 16 were superimposed on both surfaces of the circuit board 15 was demonstrated, it is not restricted to this. For example, the shield case 14 may be disposed only on the upper surface 15 a of the circuit board 15. In this case, as shown in FIG. 5, an engagement claw is provided on the shield case 14 and is fixed by being engaged with the circuit board 15.

Moreover, although the case where the notch part 23 was formed in the outer edge of the circuit board 15 in order to fix a shield case was demonstrated, you may form the slit-shaped through-hole 26 as shown in FIG.
Further, the claw portion 24 and the engagement convex portion 25 may be formed in the upper shield case 14, and the engagement hole 21 may be formed in the lower shield case 16. Further, the claw portion 24 is not necessarily required to be bent.
In addition, a plurality of shield cases may be arranged on one surface of the circuit board 15 without being limited to the case where one shield case is arranged on each side of the circuit board 15. In this case, the number of shield cases arranged on the front surface 15a of the circuit board 15 and the number of shield cases arranged on the back surface 15b may or may not coincide.

  For example, although the mobile phone 1 has been described in the above-described embodiment, the present invention is not limited to this. The present invention can be applied to portable portable electronic devices such as PDAs (Personal Digital Assistants), digital cameras, digital video cameras, and notebook personal computers.

It is a perspective view which shows the external appearance of the mobile telephone 1 which concerns on this embodiment of this invention. 4 is an exploded perspective view showing a configuration of a second housing 7. FIG. 2 is an assembled cross-sectional view of the mobile phone 1. FIG. FIG. 3 is a view showing a structure for fixing an upper shield case 14 and a lower shield case 16 to a circuit board 15. FIG. 6 is a diagram in which a shield case is disposed on one surface of a circuit board 15.

Explanation of symbols

1 ... Mobile phone (electronic equipment)
4 ... First housing 7 ... Second housing (housing)
DESCRIPTION OF SYMBOLS 11 ... Front case part 12 ... Rear case part 14 ... Upper shield case 14h ... Screw insertion hole (insertion part)
15 ... Circuit board 15h ... Screw insertion hole (insertion part)
16 ... Lower shield case 16h ... Screw insertion hole (insertion part)
DESCRIPTION OF SYMBOLS 18 ... Electronic component 19 ... Reference potential pattern 20 ... Fixing means 21 ... Engagement hole (engagement receiving part)
22 ... Slit hole 23 ... Notch 24 ... Nail (projection)
25 ... engaging convex part 30 ... screw (fastening member)

Claims (8)

In an electronic device in which a circuit board and a shield case arranged so as to cover at least a part of the circuit board are accommodated inside a housing configured by combining two opposing case components,
The electronic apparatus according to claim 1, wherein the circuit board and the shield case are fastened together by a fastening member that fastens the two case parts.   2. The electronic device according to claim 1, wherein the circuit board and the shield case each have an insertion portion for inserting the fastening member, and are electrically connected via the insertion portion.   The electronic device according to claim 1, wherein the shield case includes a fixing unit that engages with the circuit board and can maintain the state.   The said shield case consists of the 1st shield case which covers the 1st surface of the said circuit board, and the 2nd shield case which covers the 2nd surface facing away from the said 1st surface, The Claim 1 or The electronic device according to claim 2.   The electronic device according to claim 4, wherein the first shield case and the second shield case include a fixing unit capable of maintaining a state in which the circuit board is sandwiched.   The fixing means includes a protrusion formed on one of the first shield case and the second shield case, and an engagement receiving portion that engages with the protrusion formed on the other. The electronic device according to claim 5. In an assembling method of an electronic device in which a circuit board and a shield case arranged so as to cover at least a part of the circuit board are housed in a housing configured by combining two opposing case components. ,
Engaging and fixing the fixing means formed on the shield case to the circuit board;
A step of fastening the two case components, the circuit board and the shield case together with a common fastening member;
A method for assembling an electronic device, comprising: In an assembling method of an electronic device that accommodates a circuit board and two shield cases respectively disposed on both surfaces of the circuit board in a housing configured by combining two opposing case components,
Fixing the two shield cases with the circuit board sandwiched between the two shield cases by a fixing means formed on the two shield cases;
A step of fastening the two case components, the circuit board and the two shield cases together with a common fastening member;
A method for assembling an electronic device, comprising:

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