JPH0621132Y2 - Coaxial line structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a structure of a coaxial line in an electronic device.

[Conventional technology]

In a general electronic device that handles high frequencies such as microwaves, a device configured on a printed circuit board and an external device are connected by a coaxial line. Conventionally, a coaxial cable is used as this type of coaxial line, and one end of the coaxial cable is connected to a printed circuit board and the other end is led out to the outside through a device case.

[Problems to be solved by the device]

In the structure using the conventional coaxial cable described above, it is difficult to bend the cable at a steep angle due to the flexibility of the coaxial cable, and in the mounting structure that requires bending of the cable, the cable extension is caused by this bending constraint. The installation position is restricted, and the miniaturization of the device is sacrificed. In addition, in the part that requires the shield structure, it is necessary to connect the connector through the shield case in order to prevent leaks from holes and notches provided in the shield case for leading out the cable. Yes, components such as connectors are required. For this reason, in the structure using the conventional coaxial cable, miniaturization of the device is sacrificed, and there are problems such as an increase in cost due to an increase in component parts.

An object of the present invention is to provide a coaxial line structure capable of reducing the price of the device while reducing the size of the device.

[Means for Solving the Problems]

The coaxial line structure of the present invention supports the central conductor while maintaining an insulating state at the central position in the groove formed in the shield case that accommodates the printed circuit board, and closes the groove with a lid that conducts to the shield case. The shield case and the lid form an outer conductor, and the central conductor forms a coaxial line.

[Action]

In the above-mentioned configuration, since the outer conductor is configured by the shield case and the lid, the coaxial line can be integrally formed in the shield case, and the coaxial line is configured without using the coaxial cable.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of an embodiment of the present invention, and FIG. 2 is a vertical sectional view of an assembled state. A print that forms an electromagnetic airtight container with a shield plate 1 in the shape of a shallow dish and a shield case 2 attached thereon, and forms, for example, a microwave circuit between the plate 1 and the case 2. The wiring board 3 is incorporated. In the shield case 2, one end is made to correspond to a part of the printed wiring board 3 and the other end is extended to one side of the shield case 2, and a groove portion 4 having a constant width and a constant depth is provided. To form. A central conductor 5 is housed in the groove portion 4 and is supported by a plurality of substantially U-shaped support members 6 at a substantially central position of the groove portion 4 while being insulated from the shield case 2. One end of the central conductor 5 is bent and formed in an L shape, and is connected to an input / output terminal of the printed wiring board 3 through a socket 7 at one end of the groove portion 4. The other end of the center conductor 5 is exposed to one side of the shield case 2 at the other end of the groove 4. Then, the groove 4 is covered with a lid 8 which is electrically connected to the shield case 2.

According to this configuration, the coaxial line connected to the printed wiring board 3 is composed of the shield case 2 accommodating the printed circuit board 3 and the lid 8 as an outer conductor, and the central conductor 5 housed in the groove portion 4 thereof. Will be done. Therefore,
Since the coaxial cable is not necessary and the center conductor 5 can be bent at any angle, there is no restriction of bending unlike the coaxial cable, and the coaxial line can be extended to any position to achieve downsizing of the device. it can. Further, even if the other end of the center conductor 5 is exposed to the other end of the groove 4, the shield effect of the printed circuit board 3 is not impaired, so that a connector or the like is unnecessary and the cost is low. It is also possible.

[Effect of device]

As described above, according to the present invention, since the outer conductor is composed of the shield case for accommodating the printed circuit board and the lid, the coaxial line is integrally formed in the shield case by the central conductor housed in the groove. Since the coaxial cable and the connector for connecting the coaxial cable are not required, the size and cost of the device can be reduced. Further, the shield case can be manufactured inexpensively and highly accurately by the die casting technique, and the stabilization of the quality of the coaxial line can be achieved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention, and FIG. 2 is a vertical sectional view of the assembled state. 1 ... shield plate, 2 ... shield case, 3 ...
… Printed circuit board, 4 …… Groove, 5 …… Center conductor, 6
...... Supporting member, 7 ...... Socket, 8 ...... Lid.

Claims (1)

[Scope of utility model registration request] 1. A shield case for accommodating a printed circuit board constituting an equipment circuit is provided with a groove portion having a constant width and a constant depth, and an insulating state is maintained at a central position in the groove portion to support a central conductor. A coaxial line structure characterized in that the groove is closed by a lid that conducts to the shield case, the shield case and the lid form an outer conductor, and the central conductor forms a coaxial line.