JPH027508Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a shielding structure between high-frequency circuits of an electronic device in which a plurality of high-frequency circuits are provided in the same housing with a partition wall in between.

[Prior art and its drawbacks] Used in high-frequency equipment, such as satellite broadcast reception.
The BS converter amplifies the weak radio waves received by the receiving antenna and converts them to an intermediate frequency band. That is, a received radio wave in the 12 GHz band is amplified by a high frequency amplifier circuit, and this amplified signal is mixed with an output signal from a local oscillation circuit to convert it into an intermediate frequency signal in the 1 GHz band.

In such a BS converter, leakage of radio waves between circuits will cause malfunction, so a sufficient shielding structure is required.

Conventionally, the shielding structure of this BS converter was
There was a structure in which each circuit was installed in a case with a partition wall, a conductive shield plate was placed over the cover, and a lid was pressed down from above.

However, in such a structure, a sufficient shielding effect cannot be obtained because the casing, the shield plate, and the lid each have dimensional errors.
There was also a method of applying paste solder to the leakage portion, but this method had the drawback of lacking productivity.

[Purpose of the invention] The present invention was made in view of the above-mentioned circumstances, and its purpose is to provide a shielding structure for high-frequency circuits that can obtain a sufficient shielding effect, prevent malfunctions, and improve productivity. .

[Main points of the invention] This invention is a case that is open on one side and has a partition wall inside, and a shield plate is fitted on the opening side of a case in which high-frequency circuits are installed in each room divided by the partition wall. A rod-shaped elastic body is provided on the contact portion of the shield plate with the partition wall, and a lid body is placed on top of the rod-shaped elastic body, so that the shield plate is attached to the upper end surface of the partition wall through the rod-shaped elastic body. The elastic force of the rod-shaped elastic body strengthens the adhesion between the partition wall and the shield plate, improving the shielding effect.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to the drawings. Figure 1 shows a high-frequency device according to the present invention, for example.
FIG. 2 is an exploded perspective view showing the structure of the BS converter.
In the figure, reference numeral 11 denotes a housing having an opening on the top surface, and this housing includes a printed circuit board 13 on which a high frequency amplification circuit is formed, with a partition wall 12 in between, and a mixed Printed circuit boards 14 each having a circuit formed thereon are installed. A shield plate 1 formed of a conductive material is provided on the upper surface of the casing 11.
5 is fitted. Shield plate 1
5 has L-shaped portions 15a, 15a formed at both ends to match the wall surface of the casing 11, and a U-shaped portion 15b formed at the center to match the upper end of the partition wall 12. Furthermore, a lid 16 is bonded onto the shield plate 15. Lid body 1
6 has a U-shaped portion 15b of the shield plate 15.
A U-shaped portion 16a into which the U-shaped portion 15b can be fitted is formed opposite to the U-shaped portion 16a. A rod-shaped elastic body, such as a vinyl wire 17, is interposed between the U-shaped portion 16a and the U-shaped portion 15b.

Conventionally, as mentioned above, due to dimensional errors etc., the partition wall 1
The contact force between the upper surface of the shield plate 15 and the lower surface of the shield plate 15 (indicated by A in FIG. 2) was weak, and high frequency waves sometimes leaked from this portion into the adjacent room. On the other hand, in the present invention, the cover body 16 allows the vinyl wire to
The contact portion A of the shield plate 15 is connected to the partition wall 1 through the
It is pressed against the top surface of 2. In this case, since the vinyl wire 17 has elasticity, its elastic force causes the shield plate 15 and the partition wall 12 to
Both of them are tightly adhered to each other, so that a sufficient shielding effect can be obtained.

Although the above embodiment has been described using the vinyl wire 17 as the elastic rod-shaped body, the present invention is not limited to this, and it goes without saying that other rubber members or the like may also be used. Further, although the shield plate 15 has a U-shaped portion 15b at the contact portion A, it may have a planar shape without providing the U-shaped portion 15b. In addition, in the above embodiment, the present invention is
I explained an example applied to a BS converter, but
Of course, the present invention can also be applied to other high frequency devices having multiple circuits.

[Effects of the Invention] As described above, according to the present invention, a sufficient shielding effect can be obtained without using paste solder or the like, so that malfunctions can be prevented and productivity can be improved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a shielding structure for a high frequency circuit according to an embodiment of the present invention, and FIG. 2 is a sectional view of the same structure after assembly. 11... Housing, 12... Partition wall, 13, 14...
...Printed circuit board, 15...Shield plate, 16...
Lid body.

Claims (1)

[Scope of claim for utility model registration] Having an opening on one side and a partition wall inside,
A housing in which a high frequency circuit is provided in each of the rooms divided by the partition wall, and a contact portion into which the upper end of the partition wall of the housing is inserted, and the contact portion is fitted into the opening surface of the housing. a shield plate; a rod-shaped elastic body provided on the contact portion of the shield plate with the partition wall; and a groove portion into which the contact portion is fitted via the rod-shaped elastic body; A shielding structure for a high frequency circuit, comprising: a lid body installed on an opening surface and pressing the shield plate against the partition wall via the rod-shaped elastic body.