JPH06232585A - Shielding apparatus - Google Patents

Abstract

PURPOSE:To obtain a sufficient shielding effect for electronic components, by a light and thin shielding apparatus. CONSTITUTION:Certain sections of a flexible board 10 mounted with electronic components 12 are extended respectively to predetermined places. On the extended sections of the flexible board 10, predetermined shielding patterns 14A-14D, 15 are so formed that a mounting section 13 for the electronic components 12 can be covered therewith. Thereby, a sufficient shielding effect for the electronic components can be obtained with a simple configuration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield device, and is particularly suitable for application to shield a desired portion of a circuit board using a flexible board.

[0002]

2. Description of the Related Art Conventionally, a so-called shield box has been used to shield a circuit board on which electronic components are mounted. That is, as shown in FIG. 3, an electronic component 2 such as a resistor and a capacitor which is an integrated circuit or a chip component is surface-mounted on the circuit board 1, and a shield box 3 is provided so as to cover the electronic component 2. It is installed. As shown in FIG. 4, the shield box 3 has a box-shaped side wall 3A and a lid 3B selected to cover the side wall 3A made of a conductive metal plate.

In the case of this shield box 3, the side wall portion 3
At the central portions of the four lower sides of A, mounting portions 4A, 4B, 4 for mounting the shield box 3 on the surface of the circuit board 1 are mounted.
C and 4D, and rod-shaped soldering feet 5A, 5B, 5C and 5D are formed integrally with the side wall portion 3A at the tips of the mounting portions 4A to 4D. As a result, the side wall portion 3A of the shield box 3 is attached to the mounting through hole formed in the circuit board 1, and the solder stopper feet 5A, 5B, 5C, 5
By inserting D and soldering it, it is electrically and mechanically mounted on the circuit board 1.

Further, through holes 6A, 6B, 6C and 6D are formed at the center of each side surface of the side wall portion 3A, and the lid portion 3B is formed.
Attached to the side wall 3A, hemispherical projections 7A, 7B, 7C, 7 formed at the center of each inner surface of the lid 3B.
D engages with the through holes 6A to 6D so that the lid 3B can be locked with the side wall 3A covered.

[0005]

By the way, since the shield box 3 having such a structure is formed of a large member,
It is unavoidable that the weight is increased, and it is difficult to perform surface mounting like the electronic component 2, and there is a problem that a step for mounting is required accordingly. Further, since the shield box 3 itself is mounted on the circuit board 1 by soldering, it is difficult to measure the circuit board 1 or replace the electronic components even if the lid 3B is removed, which is convenient. It was still inadequate.

Further, when the electronic component 2 is mounted on a circuit board made of a flexible substrate, use of the shield box 3 as described above impairs all advantages of the flexible substrate which is lightweight, thin and flexible. As a result, it was still insufficient for practical use.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a shield device which is lightweight and thin and has a sufficient shield effect.

[0008]

In order to solve such a problem, in the present invention, a circuit board 10 made of a flexible board on which a predetermined electronic component 12 is mounted, and a part of the flexible board of the circuit board 10 are extended. Then, the extended flexible substrate is provided with shield members 14A to 14D, 15 each having a predetermined shield pattern formed thereon, and the desired portions 13 of the circuit board 10 are covered with the shield members 14A to 14D, 15.

[0009]

The electronic component 12 is formed by extending a part of the flexible substrate on which the electronic component 12 is mounted and forming a predetermined shield pattern on the extended flexible substrate.
By covering the mounting portion 13 of, the sufficient shield effect can be obtained with a simple configuration.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 10 generally indicates a circuit board having a flexible board structure provided with a shield device 11 according to the present invention, and a component mounting portion 13 on which a predetermined electronic component 12 is surface-mounted extends in three directions. Has been done. As shown in FIG. 1 (A), the extended portions of the flexible substrate are connected to the short sides of the component mounting portion 13, respectively, and have first and second side wall portions 14A and 14B having a predetermined rectangular shape.
And a third side wall portion 14C, a lid portion 15 and a fourth side wall portion 14D which are connected to the long sides of the component mounting portion 13 and are also connected to each other.

The third side wall portion 14C has a predetermined rectangular shape, the lid portion 15 has a rectangular shape equal to the component mounting portion 13, and the fourth side wall portion 14D has a third side wall portion 14C. It has a rectangular shape equal to. The first to fourth side wall portions 14A to 14D and the lid portion 15 are connected by forming a solid ground pattern.

In the case of this embodiment, the first and second side wall portions 14A and 14B are bent toward the component mounting portion 13 side at the bending lines a and b, respectively, and the third side wall portion 14 is bent.
C, the lid portion 15, and the fourth side wall portion 14D are sequentially bent toward the component mounting portion 13 side along bending lines c, d, and e, respectively.

Thus, the component mounting portion 13 on which the electronic component 12 is surface-mounted has the first pattern on which the ground pattern is formed.
~ Covered by the fourth side wall portions 14A to 14D and the lid portion 15,
A shield device 11 having a shield effect as a whole is formed.

According to the above configuration, the component mounting portion 13 of the flexible substrate on which the electronic component 12 is mounted is extended, and a solid ground pattern is formed on the extended flexible substrate to form the component mounting portion 13. By covering the above, it is possible to realize the shield device 11 which is lightweight and has a thin shape with only the height of the components and which can obtain a sufficient shield effect.

Further, according to the above-mentioned structure, the shield device 11 can be obtained by integrally molding with the flexible substrate and only by bending, and thus the manufacturing process can be remarkably simplified, and if it is developed, component mounting can be achieved. It is possible to realize the shield device 11 that can easily measure the portion 13 and easily execute the component replacement.

In the above-described embodiment, the case where the whole of the component mounting portion 13 is covered and shielded has been described, but instead of this, as shown in FIG. 2 in which parts corresponding to those in FIG. , The electronic components that you want to shield 12
However, if the side walls 16A to 16D and the lid 17 are formed in a shape corresponding to the corner portion of the circuit board 10 if it exists, the same effect as that of the above-described embodiment can be realized.

Further, in the above-described embodiment, the side wall 14A
14D and the lid 15 are formed of a flexible substrate and cover the entire component mounting portion 13, but instead, in the case where the noise generation direction is determined in particular, a shape that shields only that direction However, the same effect as that of the above-described embodiment can be realized.

Further, in the above-described embodiment, the side wall 14
Although A to 14D and the lid 15 are formed by the solid ground pattern, a mesh-shaped ground pattern may be used instead of the solid ground pattern to reduce the weight as a whole.

[0020]

As described above, according to the present invention, a part of a flexible board on which an electronic component is mounted is extended, and a predetermined shield pattern is formed on the flexible board in the extended portion, so that the electronic component By covering the mounting portion, it is possible to realize a shield device having a simple configuration and a sufficient shield effect.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a shield device according to the present invention.

FIG. 2 is a schematic diagram showing a shield device according to another embodiment.

FIG. 3 is a schematic diagram used for explaining a conventional shield method for a circuit board.

FIG. 4 is a schematic perspective view showing the shield box.

[Explanation of symbols]

1, 10 ... Circuit board, 2, 12 ... Electronic parts, 3 ...
Shield box, 11 ... Shield device, 14A-1
4D, 16A to 16D ... Side wall part, 15, 17 ... Lid part.

Claims (1)

[Claims] 1. A circuit board comprising a flexible board on which predetermined electronic parts are mounted, and a part of the flexible board of the circuit board is extended.
A shield device, comprising: a shield member having a predetermined shield pattern formed on the flexible substrate of the extension portion, and a desired portion of the circuit board is covered with the shield member.