JP2001345591A - Electronic equipment and assembling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device and its assembling method for cost reduction and improved shield effect and assembly workability, without having to use of another piece, such as a conductive member. SOLUTION: A conductive shield member 5 for electromagnetically shielding a first circuit board 2 against is connected electrically to a ground part 2a of the first circuit board 2, while a ground part 3a of a second circuit board 3 jointed to the first circuit board 2 is connected electrically to the shield member 5, thereby constituting electromagnetic shield.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having electric and circuit parts mounted thereon, and more particularly to an electronic device having a substrate shield structure and a method of assembling the same.

[0002]

2. Description of the Related Art In recent years, due to the increase in clock frequency due to the progress of miniaturization, weight reduction, and enhancement of functions of electronic devices, electromagnetic noise generated from a circuit board increases and adversely affects other electronic devices. Has been strongly affected by electromagnetic noise from electronic devices. Therefore, the electromagnetic shield of the circuit board is indispensable.

FIG. 7 is a longitudinal sectional view of a conventional electronic device.

In FIG. 7, 1 is a CPU, 2 is a first circuit board on which the CPU is mounted, 3 is a second circuit board, 4a
And 4b are board-to-board connectors for electrically connecting the first and second boards, 5 is a conductive shielding member for electromagnetically shielding, 6 is a housing, 6a and 6b
Is a boss of the housing, 7 is a screw for fixing the first and second circuit boards to the housing, and 9 is a conductive member.

In the prior art, the CPU 1 is packaged as a BGA or the like with the downsizing and high performance of electronic equipment. Therefore, the CPU 1 is mounted on the first circuit board 2 in order to reduce the board cost. The first circuit board 2 and the second circuit board 3 are electrically connected by board-to-board connectors 4a and 4b.

Although the first circuit board 2 on which the CPU 1 is mounted is shielded by the shield member 5, it is necessary to firmly ground the first circuit board 2 in order to suppress electromagnetic noise. . However, the ground connection by the board-to-board connectors 4a and 4b for electrical connection between the first circuit board 2 and the second circuit board 3 is not enough. The circuit board 2 and the second circuit board 3 are connected and fixed by screws 7.

With the above configuration, the conventional electronic device forms a shield with the shield member 5 and the conductive member 9 for reinforcing the ground, thereby suppressing electromagnetic noise.

[0008]

However, as described above, a conductive member for reinforcing the ground is required in addition to the shield member, which has caused a cost increase.
Also, it has been difficult to improve the workability of assembling the electronic device by attaching a conductive member to strengthen the ground.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems and to reduce the cost, improve the shielding effect, and improve the workability of assembly without using another piece such as a conductive member.

[0010]

In order to achieve this object, the present invention relates to a method of electrically connecting a shield member having a conductive property for electromagnetically shielding a first circuit board and a ground portion of the first circuit board. And the shield member is electrically connected to the ground portion of the second circuit board to which the first circuit board is joined. Further, the shield member is divided and connected to the ground of the first circuit board and the ground of the second circuit board.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The first aspect of the present invention provides a first circuit board, a conductive shielding member for electromagnetically shielding the first circuit board, and a first circuit board. An electronic device having a second board electrically connected to the first circuit board, the second board electrically connecting the shield member to a ground portion of the first circuit board, and a second circuit board connected to the first circuit board. The electronic device is characterized in that an electromagnetic shield is formed by electrically connecting the ground portion of the second circuit board and the shield member, thereby strengthening the ground of the first circuit board without using a separate piece. Can be performed, and at the same time, the electromagnetic shielding effect can be improved, which has the effect of reducing cost and improving the workability of assembly.

According to a second aspect of the present invention, an end surface of a shield member for electromagnetically shielding the first circuit board is electrically connected to a ground portion of the second circuit board via an elastic conductive material. The electronic device according to claim 1, characterized in that the ground of the first circuit board can be strengthened without using a separate piece, and the shielding effect can be improved. This has the effect of reducing costs and improving workability. further,
Only by pressing the conductive material bonded to the shield member against the ground of the second substrate, electrical connection becomes possible, which has the effect of further improving workability.

According to a third aspect of the present invention, a first circuit board, a first conductive shield member for electromagnetically shielding the first circuit board, and a first circuit board are provided. An electronic device comprising: a joined second circuit board; and a second shield member electrically connected to a ground portion of the second circuit board, wherein the first shield member and the first circuit board are provided. The electronic device is characterized in that the electronic device is configured to electrically connect the second shield member and the first shield member and electrically configure the shield by electrically connecting the second shield member and the first shield member. The grounding of the first circuit board can be strengthened without using it, and at the same time, the electromagnetic shielding effect can be improved, which has the effect of reducing costs and improving workability.

According to a fourth aspect of the present invention, the CPU is mounted on the first circuit board.
The electronic device according to the third aspect has the effect of improving the electromagnetic shielding effect.

According to a fifth aspect of the present invention, there is provided the first circuit board after a conductive shielding member for electromagnetically shielding the first circuit board is arranged at a predetermined position on the housing. The first circuit board is fixed to the housing so that the ground portion and the shield member are electrically connected to each other.
Bonding the circuit board to the first circuit board, disposing the circuit board at a predetermined position, and fixing the second circuit board to the housing such that the shield member and the ground portion of the second circuit board are electrically connected to each other. According to the method for assembling electronic equipment, the first circuit board can be fixed to the housing and the shield member can be electrically connected at the same time, and the second circuit board can be fixed to the housing, the electrical connection and Since the ground connection between the first circuit board and the second circuit board can be made at the same time, the assembling workability is improved, and the cost of the electronic device having an excellent shielding effect can be reduced.

According to a sixth aspect of the present invention, there is provided the first circuit board having a conductive property for electromagnetically shielding the first circuit board.
After arranging the shield member at a predetermined position of the housing, the first circuit board is fixed to the housing so that the ground of the first circuit board is electrically connected to the first shield member, A second shield member electrically connected to and fixed to the ground portion of the second circuit board joins the first circuit board and the second circuit board and fixes the first shield at a predetermined position. The first circuit board and the second circuit board are joined by the method of assembling the electronic device characterized by being electrically connected to the member, and the second circuit board is fixed at a predetermined position, The shield member of the first circuit board and the shield member of the second circuit board are joined to enable electrical connection, thereby improving assembly workability and reducing the cost of an electronic device having an excellent shielding effect. Has the effect of being able to.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a configuration diagram of an electronic device according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the electronic device, and FIG. 3 is an assembly diagram of the electronic device.

In FIGS. 1, 2 and 3, 1 is a CP.
U, 2 are a first circuit board on which the CPU 1 is mounted, 2a is a ground portion of the first circuit board 2, 3 is a second circuit board,
Reference numeral 3a denotes a ground portion of the second circuit board 3, 4a and 4b denote board-to-board connectors for electrically connecting the first circuit board 2 and the second circuit board 3, and 5 denotes conductivity for electromagnetically shielding. A shield member, 6 is a housing, 6a and 6b are bosses of the housing 6, and 7 is a first circuit board 2 and a second circuit board.
For fixing the circuit board 3 to the housing 6.

Next, an assembling method will be described with reference to FIG. As shown in FIG. 3, after inserting a conductive shielding member 5 for electromagnetically shielding the first circuit board 2 into the housing 6, the first circuit board 2 on which the CPU 1 is mounted is inserted. It is fixed to the boss 6a of the housing 6 with screws 7. At this time, the ground portion 2a of the first circuit board 2 and the shield member 5 are electrically connected by being sandwiched between the boss portion 6a of the housing 6 and the screw 7. Further, the second circuit board 3 is inserted into the housing 6, and the board-to-board connector 4 b of the second circuit board 3 is joined to the board-to-board connector 4 a of the first circuit board 2, and a predetermined At the position, it is fixed to the boss portion 6b with a screw 7. At this time, the second
The ground portion 3a of the circuit board 3 and the shield member 5 are sandwiched and electrically connected by the boss 6b of the housing 6 and the screw 7.

With the above configuration, the shield member 5 is electrically connected and fixed to the ground portion 2a of the first circuit board 2 and the ground portion 3a of the second circuit board 3, so that a separate piece is not used. Therefore, the ground can be strengthened, and there is an effect that the electromagnetic shield is improved, the cost is reduced, and the assembling workability is improved.

FIG. 4 is a longitudinal sectional view of the electronic apparatus according to the first embodiment of the present invention.

As shown in FIG. 4, the shield member 5 and the second
Instead of using the screw 7 when fixing the circuit board 3 to the above, the connection can be made via a conductive material 8 having elasticity, for example, a sheet-shaped conductive material. In this case, the shield member 5 is fixed by fixing the second circuit board 3 to the housing 6.
Can be pressed against the ground portion 3a of the second circuit board 3, thereby enabling electrical connection, further improving workability and improving the shielding effect. Having.

In this embodiment, an example in which the first circuit board and the second circuit board are joined by a board-to-board connector has been described. However, the present invention is not limited to this method. It goes without saying that it is possible to do so.

The method of fixing the shield member and the circuit board is not limited to the present embodiment, but can be realized by, for example, a method of thermally welding a part of the housing to the shield member and the circuit board. it can. Further, a third circuit board or the like may be provided.

(Embodiment 2) FIG. 5 is an assembly view of an electronic device according to a second embodiment of the present invention, and FIG. 6 is a longitudinal sectional view of the electronic device.

5 and 6, 1 is a CPU, 2 is a C
The first circuit board on which the PU is mounted, 2a is the ground section of the first circuit board, 3 is the second circuit board, 3a is the ground section of the second circuit board, 4a and 4b are the first circuit boards 2
And a board-to-board connector for electrically connecting the second circuit board 3 and first and second shield members 5a and 5b, which are conductive for electromagnetic shielding, 6 is a housing, and 6a and 6b are housings. Boss portions 7 of the body 6 are screws for fixing the first circuit board 2 and the second circuit board 3 to the housing 6.

Next, an assembling method will be described. It is the same as the first embodiment except that the second shield member 5b is used. In the case of the present embodiment, when the electronic components of the second circuit board 3 are mounted by reflow or the like, the second shield member 5b can be mounted similarly.

As shown in FIG. 5, a first shielding member 5a having a conductive property for electromagnetically shielding the first circuit board 2 is inserted into the housing 6, and the first shielding member 5 on which the CPU 1 is mounted is mounted.
Is fixed to the boss 6a of the housing 6 with screws 7. At this time, the ground portion 2a of the first circuit board 2 and the first shield member 5a are electrically connected by being sandwiched between the boss portion 6a of the housing 6 and the screw 7.
Further, the second circuit board 3 having a conductive second shield member 5b for electromagnetically shielding and electrically connected to and fixed to the ground portion 3a is inserted into the housing 6, and the second circuit board 3 The board-to-board connector 4b is joined to the board-to-board connector 4a of the first circuit board 2, and is fixed to a boss 6b at a predetermined position of the housing 6 by screws 7. At this time, the first circuit board 2 and the solidified first shield member 5a and the second shield member 5b fixed to the second circuit board 3 are fitted at the outer peripheral portion via the housing 6. ,
Electrically connected.

With the above configuration, the shield portions 5a and 5b are electrically connected and fixed to the ground portion 2a of the first circuit board 2 and the ground portion 3a of the second circuit board 3, so that different pieces are used. Thus, the ground can be strengthened without any problems, and there is an effect that the electromagnetic shield is improved, the cost is reduced, and the assembling workability is improved. In particular, the first
Since the operation for fixing the shield member 5a to the second circuit board 3 does not occur, the assembling workability is further improved.

In this embodiment, an example in which the first circuit board and the second circuit board are joined by a board-to-board connector has been described. However, the present invention is not limited to this method, and the joining is performed by a cable or the like. It is also possible.

The second circuit board 3 and the second shield member 5b are fixed by soldering, but may be fixed by screws 7. Further, a third circuit board or the like may be provided.

[0033]

As described above, according to the present invention, a conductive shield member for electromagnetically shielding the first circuit board is electrically connected to the ground portion of the first circuit board. The shield is formed by electrically connecting a ground portion of the second circuit board to which the first circuit board is joined and the shield member, thereby providing the first circuit board.
The ground of the circuit board and the second circuit board can be strengthened, and the electromagnetic shield can be improved, the cost can be reduced, and the workability can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electronic device according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the electronic device according to the first embodiment of the present invention.

FIG. 3 is an assembly view of the electronic device according to the first embodiment of the present invention;

FIG. 4 is a longitudinal sectional view of the electronic device according to the first embodiment of the present invention.

FIG. 5 is an assembly view of an electronic device according to a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of an electronic device according to a second embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a conventional electronic device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU 2 1st circuit board 2a 1st ground part 3 2nd circuit board 3a 2nd ground part 4a 1st board to board connector 4b 2nd board to board connector 5 Shield member 5a 1st shield Member 5b Second shield member 6 Case 6a Boss part 7 Screw 8 Elastic conductive material 9 Member

Claims (6)

[Claims] A first circuit board, a conductive shielding member for electromagnetically shielding the first circuit board, and a second board electrically connected to the first circuit board. An electronic device having an electrical connection between the shield member and a ground portion of the first circuit board, and a ground portion of the second circuit board to which the first circuit board is joined. An electronic device comprising an electromagnetic shield formed by electrically connecting a shield member. 2. An end face of a shield member for electromagnetically shielding the first circuit board is electrically connected to a ground portion of the second circuit board via an elastic conductive material. The electronic device according to claim 1. 3. A second circuit board to which a first circuit board, a first shield member having a conductivity for electromagnetically shielding the first circuit board, and the first circuit board are joined. And a second shield member electrically connected to a ground portion of the second circuit board, wherein the first shield member and the ground portion of the first circuit board are connected to each other. An electronic device, wherein the shield is formed by electrically connecting the second shield member and the first shield member while electrically connecting the second shield member and the first shield member. 4. The electronic apparatus according to claim 1, wherein a CPU is mounted on the first circuit board. 5. After a conductive shield member for electromagnetically shielding the first circuit board is arranged at a predetermined position on the housing, the ground portion of the first circuit board and the shield member are connected to each other. The first circuit board is fixed to the housing so as to be electrically connected, and then the second circuit board is joined to the first circuit board and arranged at a predetermined position, and the shield member and the second circuit are arranged. A method for assembling an electronic device, comprising: fixing the second circuit board to a housing so as to be electrically connected to a ground portion of the board. 6. A method according to claim 6, wherein a first shielding member having a conductive property for electromagnetically shielding the first circuit board is disposed at a predetermined position on the housing, and then a ground of the first circuit board is connected to the first shielding member. The first circuit board is fixed to the housing so as to be electrically connected to the first shield member, and the second shield member electrically connected and fixed to the ground portion of the second circuit board is the first shield member. A method of assembling an electronic device, wherein the circuit board and the second circuit board are electrically connected to a first shield member when the circuit board and the second circuit board are fixed to a predetermined position.