JPH1065380A - Shield cover attaching structure for communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield cover attaching structure for communication equipment with which the shield cover of communication equipment can be attached easily to the equipment, without using any assembling jig, etc., at the time of assembling the equipment, and the man-hour and cost of the assembling work can be reduced. SOLUTION: A plurality of engaging tongue pieces 21 are formed by cutting and raising a shield cover 2 covering electronic parts 3, and the cover 2 is held by elastically engaging the pieces 21 with engaging sections 12 provided on a printed board. In addition, projecting sections 22 are formed on the upper surface of the cover 2, so that the sections 22 can come into contact with the printed board when the covert 2 is held and holding sections 24 and 25 which hold the parts 3 are formed in each screwed section 23 of the cover 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield cover mounting structure for a communication device, and more particularly to a shield cover mounting structure which is most suitable for use in a vehicle-mounted radio communication device.

[0002]

2. Description of the Related Art FIG. 6 shows a mounting structure of a shield cover in a conventional in-vehicle wireless communication device or the like, in which 6 is a printed circuit board, 9 is a power module mounted on a chassis (not shown), and 8 is a power module. Reference numeral 7 denotes a shield cover arranged so as to cover 9, and 7 denotes an insulating sheet interposed between the printed circuit board 6 and the shield cover 8.

At the time of assembling, an assembling jig 10 having a guide pole 10a is used for positioning. A mounting portion 91 of the power module 9 is inserted into the guide pole 10a, and a shield cover 8 is put on the power module 9. Then, the screw portion 81 of the shield cover 8 is inserted into the guide pole 10a.

Further, a printed board 6 is put on the shield cover 8 via an insulating sheet 7 and a driver insertion hole 61 formed in the printed board 6 is formed in the guide pole 10a.
Insert

The legs (terminals) 92 of the power module 9 project from the terminal connection holes 62 of the printed circuit board 6 through the insertion holes 82 provided in the shield cover 8 and the insertion holes 71 provided in the insulating sheet 7. Then, the legs 92 are soldered to the printed circuit board 6 to hold the power module 9 on the printed circuit board 6, the assembly jig 10 is removed and set on the chassis. The mounting portion 91 of the power module 9 is mounted on the chassis.

[0006]

In the conventional shield cover mounting structure of a communication device, an assembling jig 10 is required for positioning each member. In particular, the legs 92 of the power module 9 are connected to the printed circuit board 6. When inserting the printed circuit board 6 into the terminal connection hole 62, the guide pole portion 10a and the driver insertion hole 61 have different diameters, so that the positioning is troublesome. Insulating sheet 7 was required to prevent contact.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks of the prior art, and to provide a shield for a communication device that can be easily attached without assembling jigs and the like at the time of assembling, thereby reducing man-hours and costs. An object of the present invention is to provide a cover mounting structure.

[0008]

According to a first aspect of the present invention, there is provided a communication device according to the present invention, wherein a plurality of engaging tongues are formed by cutting and raising a shield cover for covering an electronic component. And the engaging tongue is resiliently engaged with an engaging portion provided on the printed circuit board to be held.

Thus, the shield cover can be held on the printed circuit board, and the assembling work is facilitated.

According to a second aspect of the present invention, the engaging portion provided on the printed circuit board is a notch formed at an opening edge of a driver insertion hole for screwing the electronic component to the chassis.

Thus, the opening edge of the driver insertion hole provided in the printed circuit board can be used as an engaging portion for engaging the engaging tongue of the shield cover.

According to a third aspect of the present invention, a projection is provided on the top surface of the shield cover so as to correspond to a portion of the printed circuit board having no circuit pattern, and the projection is brought into contact with the printed circuit board. The present invention is characterized in that a predetermined distance is provided between the substrate and the shield cover so as to prevent an electrically unstable influence.

As a result, the conventionally required insulating sheet and the like become unnecessary, and the number of components can be reduced.

According to a fourth aspect of the present invention, a holding piece for holding the electronic component is provided at a screwed portion formed on the shield cover for screwing the electronic component to the chassis.

Thus, the electronic component can be held on the shield cover in the positioned state.

According to the fifth aspect of the present invention, a grounding tongue is formed on the side surface of the shield cover so as to be in contact with a boss, a wall, and other vertical parts protruding from the chassis. It is characterized by having such a configuration.

Thus, the shield cover can be easily and reliably grounded.

According to a sixth aspect of the present invention, an index portion indicating the direction is provided on the top surface of the shield cover, and a printed surface having a shape corresponding to the index portion is formed on the printed circuit board. Are adapted to prevent reverse connection.

Thus, there is no possibility that the direction of the components is erroneously set during assembly, and reverse connection can be prevented.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a mounting structure of a shield cover in a communication device according to the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view of a mounting structure of a shield cover in a communication device, FIG. 2 is a cross-sectional view showing a mounting state,
3A and 3B are enlarged views showing an electronic component holding portion, wherein FIG. 3A is a perspective view and FIG. 3B is a front view of a state where the electronic component is held.

In the figure, 1 is a printed circuit board, 2 is a shield cover, and 3 is an electronic component. In the embodiment, two power modules are shown. 4
Is a chassis formed by die casting, and 5 is a fixing screw.

The shield cover 2 is formed in a substantially box shape so as to cover the power module 3 as an electronic component, and a plurality of (four in the embodiment) engaging tongue pieces 21 are provided on the upper surface thereof by cutting and raising. The engaging tongue piece 21 has elasticity.

The printed circuit board 1 has a driver insertion hole 11 and a terminal connection hole 13 similar to those of the related art.
1 is provided with a notch 12 at the opening edge thereof,
Are fitted in the cutouts 12 and are resiliently engaged.

A hemispherical convex portion 22 is provided on the top surface of the shield cover 2 at a position corresponding to a portion of the printed circuit board having no circuit pattern, and the convex portion 22 is brought into contact with the back surface of the printed circuit board 1. Thereby, a predetermined distance is provided between the printed circuit board 1 and the shield cover 2,
As a result, the configuration is such that there is no electrically unstable influence without using the insulating sheet 7 or the like as in the related art.

The front and rear edges of the shield cover 2 are formed by bending two screwing portions 23 each having a screw hole 26, and the inner side edge of the screwing portion 23 has a substantially U-shaped section. A holding piece 24 curved in a letter shape is formed, and a bent piece 25 is formed on the outer side edge. The power module 3 is held between the holding piece 24 and the bent piece 25 and held. It has become so. The holding piece 24 has a spring property, and a hemispherical projection 2 is formed on the inner surface of the holding piece 24.
4a are formed so that the power module 3 can be securely held.

An insertion hole 27 is formed in the top surface of the shield cover 2 so that the leg 32 of the power module 3 can protrude, and a notch serving as an indicator indicating directionality is formed at one side edge of the insertion hole 27. 28 are provided. On the other hand, a printed surface (not shown) having a shape corresponding to the cutout portion 28 is formed on the printed board 1 by silk printing or the like. Therefore, at the time of assembling, the notch 28 and the printed circuit board 1
The directionality is secured by matching with the indicator part of
Reverse connection is prevented.

FIGS. 4 and 5 show another embodiment of the shield cover 2 in which a grounding tongue piece 29 is formed by cutting and raising a side surface of the shield cover 2 to form a boss portion or a wall portion formed on the chassis 4. The shield cover 2 is reliably grounded by being brought into contact with the vertical portion 42.

The assembling example of the above-described configuration will be described. The shield cover 2 is fitted by fitting the engaging pieces 21 of the shield cover 2 into the cutouts 12 provided in the driver insertion holes 11 of the printed circuit board 1 at four positions. 2 is attached to the printed circuit board 1.

In this case, by attaching the printed surface (not shown) as an index provided on the printed circuit board 1 and the index portion 28 of the shield cover 2 so as to match each other, the directionality is secured, and there is a possibility that reverse connection may occur. Absent. In addition, since the engagement piece 21 has a spring property, as shown in FIG. 2, the engagement piece 21 holds the printed board 1, and does not fall off the printed board 1. Then, since the convex portion 22 on the top surface of the shield cover 2 comes into contact with a portion having no circuit pattern on the bottom surface side of the printed board 1, a predetermined gap is formed between the printed board 1 and the shield cover 2, Insulation is ensured.

Next, the power module 3 is fitted and temporarily held between the holding pieces 24 and the bent pieces 25 of the shield cover 2 so as to be held therebetween. As a result, the legs 32 of the power module 3 project from the insertion holes 27 of the shield cover 2 and are inserted into the terminal connection holes 13 of the printed circuit board 1, and are soldered in this state, and are fixed to the shield cover 2 by the fixing screws 5. 3 is fixed to the chassis 4. Reference numeral 41 denotes a screw hole provided in the chassis 4.

In the configuration example shown in FIG. 4, the grounding tongue piece 29 provided on the side surface of the shield cover 2 when attached to the chassis 4 as described above has a vertical portion such as a boss or wall projecting from the chassis 4. As a result, the shield cover 2 is securely grounded.

[0032]

According to the mounting structure of the shield cover in the communication device according to the present invention, the shield cover can be held on the printed circuit board according to the first aspect, and an assembling jig is not required. Assembly work becomes easier.

According to the second aspect, the opening edge of the driver insertion hole provided in the printed circuit board can be used as an engaging portion for engaging the engaging tongue of the shield cover.

According to the third aspect, an insulating sheet or the like which has been conventionally required becomes unnecessary, and the number of components can be reduced.

According to the fourth aspect, the electronic component can be held by the shield cover in a positioned state.

According to the fifth aspect, the shield cover can be easily and reliably grounded.

According to the sixth aspect of the present invention, there is no fear that the direction of the components is erroneously set during assembly, and reverse connection can be prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a mounting structure of a shield cover in a communication device according to the present invention.

FIG. 2 is a cross-sectional view showing the entire mounting state.

FIG. 3 is an enlarged view showing a holding portion of an electronic component, and FIG.
Is a perspective view, and (B) is a front view showing a sandwiched state.

FIG. 4 is a perspective view showing another configuration example of the shield cover.

FIG. 5 is a side view showing a ground state of the shield cover.

FIG. 6 is an exploded perspective view showing a mounting structure of a shield cover in a conventional communication device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 11 Driver insertion hole 12 Notch as an engagement part 13 Terminal connection hole 2 Shield cover 21 Engagement tongue piece 22 Convex part 23 Screwed part 24 Nipping piece 25 Bent piece 27 Insertion hole 28 Indicator part 29 Grounding Tongue piece 3 Electronic component (power module) 31 Mounting part 32 Leg 4 Chassis 42 Vertical part 5 Fixing screw

Claims (6)

[Claims] A plurality of engaging tongues are provided by cutting and raising a shield cover for covering an electronic component, and the engaging tongues are elastically engaged with and held by an engaging portion provided on a printed circuit board. A structure for mounting a shield cover in a communication device, characterized in that the shield cover is mounted on the communication device. 2. The method according to claim 1, wherein the engaging portion provided on the printed circuit board is a notch formed at an opening edge of a driver insertion hole for screwing the electronic component to the chassis.
The mounting structure of the shield cover in the communication device described in the above. 3. A printed circuit board, wherein a convex portion is provided on the top surface of the shield cover so as to correspond to a portion having no circuit pattern, and the convex portion is brought into contact with the printed circuit board so that a gap between the printed circuit board and the shield cover is provided. The shield cover mounting structure for a communication device according to claim 1, wherein a predetermined distance is provided so as to prevent an electrically unstable effect. 4. A holding piece for holding an electronic component is provided at a screw portion formed on a shield cover for screwing the electronic component to a chassis.
The mounting structure of the shield cover in the communication device described in the above. 5. A grounding tongue protrudingly formed on a side surface of the shield cover so that the grounding tongue is brought into contact with a boss portion, a wall portion and other vertical portions protruding from the chassis. The mounting structure of the shield cover in the communication device according to claim 1. 6. An index portion indicating directionality is provided on a top surface of the shield cover, and a printed surface having a shape corresponding to the index portion is formed on a printed circuit board, and the index portion and the printed surface are matched to make a reverse connection. The structure for mounting a shield cover in a communication device according to claim 1, characterized in that the shield cover is configured to prevent the occurrence of the shield cover.