JPH04171996A - Electronic apparatus - Google Patents

Abstract

PURPOSE:To prevent an undesired radiation from rushing in and rushing out by a method wherein a small-sized high-frequency unit is fitted to a cutout part of a wiring board which has been mounted inside a shielding case for a large-sized high-frequency unit. CONSTITUTION:Shielding cases 12 and 13 composed of lid parts are fitted to opening parts of a shielding case 11 composed of a frame body. A wiring board 14 on which electronic components have been mounted is mounted at the inside of the shielding case 11. A cutout part 15 is formed at one end part of the wiring board 14. A small-sized high-frequency unit is arranged and installed at the cutout part 15. Since the small-sized high-frequency unit is fitted to the cutout part 15 in the wiring board mounted inside the shielding case 11 for a large-sized high-frequency unit, the small-sized high-frequency unit is shielded additionally by the shielding case 11 for the large-sized high-frequency unit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to electronic equipment used in high frequency equipment and the like.

2. Description of the Related Art In recent years, with the practical use of satellite broadcasting and the spread of cable TV, the demand for higher performance of high-frequency electronic equipment has been increasing day by day.

Conventionally, this type of electronic equipment has had a configuration as shown in FIGS. 3 and 4. In other words, ■ is a shielding case, and inside this shielding case 1 there is another one to prevent unnecessary radiation from entering, which is one of the important high frequency performance.
Two shield cases 2 were placed inside it. A signal from an electronic component (not shown) mounted inside this shield case 2 is extracted by a feedthrough capacitor 3 installed in the frame of the shield case 2, and this feedthrough capacitor 3 is further connected to the shield case 1. It was connected to a feedthrough capacitor 4 installed in the frame. Further, the signal from the feedthrough capacitor 4 is once received by the wiring board 5, and the wiring board 5 is further taken out to the outside by a cable 6. This cable 6 was input to a shield case 7, which is a second high frequency unit, and was connected to a wiring board 8 mounted inside the shield case 7.

Problems to be Solved by the Invention However, in such a conventional configuration, since the shielding case 1 and the shielding case 7 and two high-frequency units were constructed, it was necessary to connect these two high-frequency units with the cable 6. Ta. Therefore, these two high wave units will be connected with cable 6,
At this time, the cable 6 ends up acting as an antenna. Therefore, there is a problem in that the cable 6 reduces the original function of the shield case 1.7, which is to prevent unnecessary radiation from entering or exiting.

The present invention is intended to solve such problems, and aims to improve shielding performance and reduce unnecessary radiation.

Means for Solving the Problems To achieve this object, an electronic device of the present invention consists of a large high frequency unit and a small high frequency unit disposed inside the large high frequency unit, and the large high frequency unit has a shield case. , a wiring board mounted inside this shield case, and an electronic component mounted on this wiring board,
The end portion of the wiring board is provided with a notch large enough to fit the small high-frequency unit, and the small high-frequency unit is fitted into the notch.

Effect With the above configuration, the small high frequency unit is fitted into the notch of the wiring board installed inside the shield case of the large high frequency unit, so the small high frequency unit can be inserted into the shield case of the large high frequency unit. This will prevent unwanted radiation from entering or exiting these units. Furthermore, since a cable connecting these two units is no longer required, unnecessary radiation from the connecting cable is also eliminated, improving the shielding performance of electronic equipment and reducing unnecessary radiation.

Embodiment FIG. 1 is an exploded perspective view of an electronic device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part thereof.

The large-sized high-frequency unit will be explained below based on the drawings. Reference numeral 11 denotes a shield case consisting of a frame, and shield cases 12 and 13 consisting of lids are fitted into the opening of this shield case 11. Further, inside the shield case 11, a wiring board 14 on which electronic components (not shown) are mounted is mounted. A notch 15 is formed at one end of the wiring board 14.

A small high frequency unit, which will be described later, is arranged in this notch 15. Furthermore, there are a plurality of U-shaped recesses 16 on the end face of the notch 15, and wiring patterns connected to electronic components etc. mounted on the wiring board 14 are guided to the recesses 16. It's dark.

Next, a small high frequency unit will be explained.

Reference numeral 17 denotes a shield case consisting of a frame body, and shield cases 18 and 19 consisting of M portions are fitted into the opening of this shield case 17.

Further, inside the shield case 17, a wiring board 20 on which electronic components (not shown) are mounted is mounted. Further, a feedthrough capacitor 21 is installed on one side of the shield case 17, and this feedthrough capacitor 21
One terminal of is connected to the wiring pattern of the wiring board 20.

Further, the other terminal of the feedthrough capacitor 21 is bent into an L shape.

Let A be the vertical dimension of the small high frequency unit configured as described above, and B be the *dimension. At this time, the notch 1 of the wiring board 14 mounted inside the large high frequency unit
The 50 dimension is designed to be slightly larger than the vertical dimension A and horizontal dimension B of a small high frequency unit. Then, the small-sized high-frequency unit is fitted into this notch 15 and disposed.

Further, the input/output terminal of the feedthrough capacitor 21 having an L-shaped bent portion is adapted to fit into the recess 16 of the wiring board 14. Since the recess 16 formed on the wiring board 14 has a U-shape, when assembling the small high frequency unit, the feedthrough capacitor 21 of the small high frequency unit and the notch 15 of the wiring board 14
Errors can be absorbed during assembly, and soldering to the wiring pattern in the recess 16 can be easily performed. Also, L
The letter-shaped bent portion also absorbs stress when external force is applied, and prevents soldering cracks from occurring.

Further, the shield case 17 of the small high frequency unit has a top portion 17a in part. And the top part 17
A is provided with a burred and tapped hole 22 for fixing a screw. A hole 23 is also provided in the shield case 18 at a position corresponding to the hole 22.

Similarly, a shield case 11 of a large-sized high-frequency unit has a top portion 11a in part. A hole 24 is also provided in the top surface portion 11a, and a hole 25 is provided in the shield case 12, which is the lid portion, at a position corresponding to the hole 24. Then, the hole 2 provided in the shield case 18
3, the hole 24 provided in the shield case 11 is larger than the hole 22 provided in the shield case 17, and the screw 26 is larger than the hole 22 provided in the shield case 17.
smaller than the head of Further, the hole 25 provided in the shield case 12 is larger than the head of the screw 26. Then, as shown in FIG. 2, the shield case 11 and the shield case 18 are firmly fastened to the shield case 17 with screws 26, and the shield case 12 is placed over them. Therefore, since only the lid of the shield case 12 can be removed while keeping the shield cases 17 and 18 in close contact with each other, repairs can be easily performed.

As explained above, according to this embodiment, a part of the shield case of the large high frequency unit shields the small high frequency unit again, so a separate shield case 1 may be provided as shown in the conventional example. There is no need to provide a wiring board 5 for connection, a cable 6, or a feedthrough capacitor 4. Therefore, there is no deterioration in shielding performance due to the cable 6, and a reasonable and high shielding effect is achieved.

Further, there is no need to connect the units, and the work efficiency of assembly is improved.

Furthermore, as a result of rationalizing the number of parts, it is possible to downsize the electronic device.

Furthermore, costs can be reduced as a result of rationalizing the number of parts.

Effects of the Invention As described above, according to the present invention, the small high frequency unit is fitted into the notch of the wiring board installed in the shield case of the large high frequency unit, so the small high frequency unit is The high frequency unit is further shielded by the shield case, which prevents unnecessary radiation from entering or exiting the small high frequency unit. Furthermore, since a cable connecting these two units is no longer required, unnecessary radiation from the connecting cable is also eliminated, improving the shielding performance of this electronic device and reducing unnecessary radiation. Moreover, it also has the following effects.

In other words, in the present invention, as shown in the conventional example, there is no need to provide a separate shield case, a wiring board for connection, a cable, or a feed-through capacitor, so there is no need to connect the units, and work efficiency is improved. improves.

Furthermore, as a result of rationalizing the number of parts, electronic devices can be made smaller.

Furthermore, as a result of rationalizing the number of parts, it is possible to reduce costs.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an electronic device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of its main parts, FIG. 3 is an exploded perspective view of a conventional electronic device, and FIG. 4 is a cross-sectional view of its main parts. It is. 11.12.13...Shield case for large high frequency unit, 17,18.19...Shield case for small high frequency unit, 14...Wiring board, 15. ...Notch part, 16...
- Recessed portion, 21... Feedthrough capacitor.

Claims (2)

[Claims] (1) Consisting of a large high frequency unit and a small high frequency unit disposed inside the large high frequency unit, the large high frequency unit includes a shield case, a wiring board mounted inside the shield case, and a mounted electronic components, and an end of the wiring board is provided with a notch large enough to fit the small high-frequency unit, and the small high-frequency unit is fitted into the notch. Electronics. (2) A plurality of recesses and a wiring pattern connected to the recesses are provided in the notch of the wiring board, and an input/output terminal having an L-shaped bent part is provided on the side surface of the small high frequency unit, The electronic device according to claim 1, wherein the bent portion of the input/output terminal and the recessed portion fit together.