JP3282650B2 - Ground structure for communication equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding structure in a communication device, and more particularly to an optimum grounding structure applied to a portable radio communication device and the like.

[0002]

2. Description of the Related Art FIG. 8 shows a grounding structure in a conventional portable radio communication device or the like. In FIG. 8, reference numeral 11 denotes a shield cover made of aluminum die-cast, and 13 denotes a first electric component (power module) mounted on a printed circuit board 14. ) And 15 are second electrical components (BNC receptacles), 16 is a case made of aluminum die-cast, and two electrical components 13 and 15 are provided.
In order to make the ground potential the same, the sheet metal 12 caulked by the caulking portion 18 to the shield cover 11 for the second electric component 15 and the first electric component 13 The sheet metal 17 screwed to the back of the first electrical component 13 was further screwed to the shield cover 11 to make the electric potential the same.

[0003]

However, in a conventional earth structure, the sheet metal 12 is connected to the shield cover 1.
Special processing such as caulking to 1 is required, and the number of screws increases, such as screwing the sheet metal 17 separately. There were drawbacks such as unstable quality.

Incidentally, there is a structure in which one of the screws for fixing the electric parts is fixed to a sheet metal frame to make the same electric potential. However, in this case, deformation of the sheet metal when the screws are fixed causes a problem.
There is a drawback in terms of strength that the electric parts are loosened.

An object of the present invention is to solve the above-mentioned drawbacks of the conventional grounding structure and to provide a grounding structure for a communication device that can easily and surely ground an electric component.

[0006]

A ground structure in a communication device according to the present invention includes a first contact portion that contacts a first electric component and a second electric component mounted on a printed circuit board, respectively.
Common ground plate having a second contact portion with spring characteristics
Is disposed, and a first contact portion of the ground plate is provided with a first electrical portion.
In is arranged so as to cover the goods, the second contact portion, so as to resiliently contact with a second electrical component, and pressed and fixed to A over scan plates between the shield cover and the casing structure is there.

In this case, the ground plate may be provided with legs for soldering to the printed circuit board and soldered to the printed circuit board, and the legs are formed by bending the legs stepwise. With this configuration, stress applied to the legs during assembly is released, and the adhesion to the first electric component is improved.

[0008]

1 to 5 show an embodiment in which a ground structure in a communication device of the present invention is used in a wireless communication device.
In the drawing, reference numeral 1 denotes a shield cover made of aluminum die-cast which also serves as a heat sink, and 3 denotes a first cover mounted on a printed circuit board 4.
Electrical components (power modules), 5 printed circuit boards 4
Is a second electrical component (BNC receptacle) that is soldered to the second component.

Reference numeral 2 denotes a common ground plate having contact portions 2a and 2b for contacting the first electric component 3 and the second electric component 5, respectively. The ground plate 2 is a first electric component. 3
And a contact portion 2b to the second electric component 5 has a spring property so as to resiliently contact the second electric component 5, and the ground plate 2 is a shield. It is configured to be pressed and fixed to the cover 1.

In the embodiment shown in FIGS. 1 to 5 , four legs 2 c for soldering to the printed circuit board 4 are provided at one side edge of the ground plate 2. Inserted from the hole 4a and soldered. The leg 2c is formed to be bent in two stages, so that stress on the leg 2c at the time of assembly is released, and the adhesion to the first electric component 3 is improved.

[0011] To describe the assembly example in the following, first, the first electrical component (power module) 3 mounted on the printed board 4 in a state of covering the contact portions 2a of the ground plate 2, the leg of the earth plate 2 The part 2c is inserted into four holes 4a provided on the printed circuit board 4 and attached by soldering from the back surface of the printed circuit board 4.

Next, it is placed on the case 6 in that state,
The shield cover 1 is placed from above and fixed with screws 7. After attaching the second electric component (BNC receptacle) 5 to the attaching portion 6a provided on the case 6 with the screw 8,
Solder to the printed circuit board 4.

As described above, the ground plate 2 is inserted between the first electric component 3 and the shield cover 1 and screwed, so that the power module as the first electric component 3 is electrically and thermally conductive. Is improved. In addition, a vertical piece 2d is formed by bending the rear end portion of the ground plate 2 at a right angle,
Since the contact portion 2b is formed at the end of the vertical piece 2d, the contact portion 2b is connected to the second electric component 5 as BNC.
The receptacle is brought into contact with the case 6 by screwing, and serves to conduct the shield cover 1 and the first electric component 3.

Further, since the contact portion 2b is formed in a vertical state, the contact portion 2b is pressed against the end face of the shield cover 1 and is pressed by attaching the second electric component 5 to the case 6, thereby increasing the spring effect. As a result, the adhesion to the second electric component 5 is improved, and conduction can be ensured. As a result, the ground potentials of the first electric component 3 (power module) and the second electric component 5 (BNC receptacle) become the same as those of the shield cover 1, greatly contributing to the electrical performance. Further, the leg 2c is formed to be bent in two stages. For example, if there is no bending, as shown in FIG. By bending, as shown in FIG. 5, it is possible to absorb variations in assembly when the shield cover 1 is placed.

FIGS. 6 and 7 show another embodiment, in which the contact portion 2b is formed in the same plane as the ground plate 2 in a tongue shape. The contact portion 2b is configured to be in pressure contact with the second electric component 5.

In the embodiment shown in FIGS. 1 to 5, a power module is used as the first electric component 3 and the second electric component 5 is used as the first electric component 3.
However, the electric parts are not limited to these, and other electric parts and shield parts, such as a variable resistor and a shield case, may be used. It is a matter of course that a normal sheet metal material may be used instead of the aluminum die-casting which also serves as the above.

[0017]

According to the grounding structure of the communication device according to the present invention, (1) the assembling is easy and the cost can be reduced by reducing the number of steps. (2) Screws and parts only for attaching a member for grounding are not required, and cost can be reduced. (3) The case can be easily adopted even in a case where the case is small and needs to be conducted in a narrow place, such as a portable wireless communication device. (4) Since the two electrical components are brought into contact with the common ground plate, electrical conduction can be made in the shortest path, so that electrical loss is small and the heat radiation effect is improved. And so on.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of an embodiment used for a portable radio communication device, showing an embodiment of a ground structure in a communication device of the present invention.

FIG. 2 is a perspective view of a main part in an assembled state.

FIG. 3 is a partial cross-sectional plan view of a main part in an assembled state.

FIG. 4 is a side view for explaining a problem when the leg of the ground plate is not bent.

FIG. 5 is a side view for explaining the operation when the leg is bent.

FIG. 6 is an exploded perspective view of a main part showing another embodiment.

FIG. 7 is a perspective view showing a state where another embodiment is assembled.

FIG. 8 is a perspective view of a main part showing a ground structure in a conventional communication device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 shield cover 2 ground plate 2a contact portion to first electrical component 2b contact portion to second electrical component 2c leg 3 first electrical component (power module) 4 printed circuit board 5 second electrical component (BNC) Receptacle) 6 cases

Claims (2)

(57) [Claims] A first contact portion that contacts a first electric component and a second electric component mounted on a printed circuit board, respectively ;
Common ground plate is arranged having a second contact portion having a spring property, the first contact portion of the ground plate, the first
A second contact portion disposed to cover the first electrical component;
, Said has elastically contact with the second electrical component, in the ground plate communicator, characterized in that it is pressed <br/> pressure fixed between the shield cover and the casing Ground structure. The method according to claim 2, wherein said ground plate, wherein with legs for soldering to the printed circuit board is provided, the communication device according to claim 1, wherein the leg portion is characterized by being bent stepwise Ground structure at