JPH0767018B2 - Outdoor type high frequency equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an amplifier used in a CATV facility, a frequency converter, a branching / distributing device, a mixer, a receiving amplifier used for amateur radio, and a transmitter. The present invention relates to an outdoor installation type high frequency device used for a power amplifier or the like.

(Prior Art) Since this type of outdoor installation type high frequency equipment is installed outdoors, it is necessary to protect the circuit inside the equipment from rainwater, and at the same time prevent leakage and mixing of upper high frequency signals. Is also required. Therefore, conventionally, in order to prevent the intrusion of an electromagnetic shield and rainwater, a recess is formed in the lid as described in, for example, Japanese Utility Model Laid-Open Nos. 58-189854 and 61-12292, and the electromagnetic field As described in Japanese Utility Model Laid-Open No. 60-45479, a technique to attach packing integrally provided with a member with good shielding performance and EMI packing, side walls are fitted to each other on the joint surface of the case body and lid. There is known a technique in which concave grooves are provided so as to match each other, and one of the concave grooves is filled with a waterproof packing material and the other is filled with a conductive packing material.

(Problems to be Solved by the Invention) In the above-described conventional technique relating to the seal structure, the outdoor-installed high-frequency equipment has the following problems. That is, the former two techniques have a structure in which the packing material is attached in the concave groove formed in the lid body, so that not only the lid body becomes thick and the entire case becomes large, but also the case body and the packing material are The electromagnetic shield on the contact surface of is incomplete and
Over a long period of time after being installed outdoors, rainwater permeates from the contact surface between the case body and packing material due to capillary action, causing corrosion of the conductive material, and the effect of preventing leakage and mixing of high frequency signals is halved. Will end up. In the latter technique, a labyrinth is formed in the joint between the main body and the lid, and the packing material is filled in the labyrinth, so the sealing performance is excellent, but the waterproof packing material and the conductive packing material. Since the packing material and the two packing materials must be installed, the manufacturing process is troublesome. The present invention has been made to solve the above-mentioned problems, the case can be assembled in a relatively small size, the work for manufacturing for waterproofing / electromagnetic shielding is easy, and the waterproofing is performed for a long time after installation. It is an object of the present invention to provide an excellent outdoor installation type high frequency device that can be used while maintaining a good electromagnetic shield effect.

(Means for Solving the Problems) In order to solve this object, an outdoor-type high-frequency device according to the present invention includes a conductive case body and a lid body, and a high-frequency circuit is provided inside the case body. In an outdoor-installed high-frequency equipment provided with, in the joining portion of the case body and the lid body, on both facing joining surfaces of the body side and the lid side, packing packing grooves having a U-shaped cross section facing each other are provided, and In the packing accommodating groove, a string-shaped packing formed by integrally molding a conductor on one side surface of an elastic body having a rectangular cross section is provided so that the conductor faces the inside of the case and straddles the joining portion. It is characterized in that it is housed and the case body and the lid body are joined together by using the joining and fixing means, and the operation thereof is as follows.

(Function) Only the packing formed by integrally molding the elastic body and the conductive body is mounted in the single packing storage groove provided across the joint portion between the case body and the lid body. Then, the work for obtaining waterproofing and shielding effect is completed. The outdoor installation type high-frequency equipment that has been completed and installed has the packing material that is accommodated across the bonding surface, so that the electromagnetic sealing of the bonding surface is perfect, and it does not rain when used. When it comes, even if rainwater enters through the joint between the case body and the lid due to the capillary phenomenon, the elastic part of the packing prevents the rainwater from entering further. As a result, corrosion of the conductive portion does not occur, and the high frequency circuit inside is protected from rainwater.
The high-frequency circuit inside the high-frequency equipment can be electromagnetically shielded from the outside of the equipment by the conductive case body and lid, and the conductive part of the packing, and the high-frequency signal to be processed leaks out of the case. Or, on the contrary, it is possible to prevent the high frequency signal from being adversely affected by the mixing of the interfering wave.
As described above, since the conductive portion is not corroded, this shielding effect is maintained for a long time.

(Example) Hereinafter, drawings showing an example of the present application will be described. FIG. 1 is a perspective view showing a mounting state of a CATV amplifier exemplified as an outdoor installation type high frequency device, FIG. 2 is a bottom view of the CATV amplifier with a lid removed, and FIG. 3 is a CATV of FIG. FIG. 4 is a partial cross-sectional view of the amplifier for use in the line III-III, FIG. 4 is a partially enlarged view of FIG. 3, and FIG. 1 is a case body, which is made by die-casting an aluminum alloy or the like, or by molding a synthetic resin mixed with a conductive material, and has conductivity. Reference numeral 2 denotes a lid, which is made in the same manner as the case body 1 and is also conductive. Reference numeral 3 is a mounting bracket, which is used to suspend the CATV amplifier on the messenger wire 4. Five
Reference numerals a and 5b denote plug attachment portions to which coaxial plugs 6a and 6b described later are connected, respectively. These correspond to the input and output ends of the CATV amplifier, respectively. 5c shows the branch output terminal of the CATV amplifier,
A coaxial connector is used so that a high frequency television signal does not leak or mix in from the terminal portion. 6a, 6b,
6c shows waterproof coaxial plugs. In addition, coaxial connector 6a, 6b
As an example, a fitting connector is used for.
Reference numerals 7a, 7b and 7c respectively denote coaxial cables for connecting to other CATV equipment. Reference numeral 8 denotes a joining portion provided in a ring shape on the case body side, and 9 denotes a joining portion provided in a ring shape on the lid body side. Packing housing grooves 10 and 11 having U-shaped cross sections are provided on the facing surfaces of the joining portions 8 and 9 so as to face each other. 1
2 is a packing formed in an annular shape having a rectangular cross section. In the packing 12, 13 is an elastic body, and a member having excellent weather resistance and elasticity, for example, a silicone rubber in the shape of a square cord can be suitably used, and 14 is a conductor, such as monel, copper, kappa weld, stainless steel. A rectangular cord is used by knitting or weaving fine wires. The conductor 14 is integrally provided on one side surface of the elastic body 13. As an example, a string made by weaving stainless steel wire in silicone rubber is integrally molded. As shown in FIG. 2, the packing 12 is mainly placed in the packing storage groove 10 with the elastic body 13 on the outside and the conductor 14 on the inside. Reference numeral 15 indicates a threaded rod used as a fixing means for fusion. 16 is the threaded rod
15 shows a bottomed screw hole into which 15 is screwed. Reference numeral 17 denotes a through hole provided in the lid body 2 for passing the screw rod 15. 18 indicates a high-frequency circuit built in the case body 1 in the assembled state,
In this example, an amplifier circuit is shown. A circuit board 19 is fixed to a board seat 21 of the lid body 2 by using a screw rod 20. Reference numeral 22 denotes a circuit component that processes a high frequency signal. When manufacturing the CATV amplifier having the above configuration, first, the high frequency circuit 18 is assembled to the lid body 2. Next, the packing 12 cut to an appropriate length,
The elastic body 13 on the outer side and the conductor 14 on the inner side are formed into a ring shape, and both ends of the packing 12 are adhered to each other with an adhesive or the like.
At this time, it is also attempted to appropriately connect both ends of the conductor 14 serving as a joint with each other by soldering or the like. Next, the case body 1
The packing 12 processed as described above is mounted in the packing storage groove 10 on the side. If the lid body 2 with the high-frequency circuit 18 assembled is attached to the case body 1 with the packing 12 attached, and the screw rod 15 is screwed into the screw hole 16 and fixed by tightening.
The CATV amplifier is completed. CATV completed in this way
The amplifier for use is suspended from the messenger wire 4 or the like by using the mounting bracket 3, and the coaxial cable is connected to the amplifier for use.

(Effects of the Invention) As described above, in the present application, one packing having a rectangular cross section is fitted to the joint portion between the case body and the lid body, and the packing is fitted into the groove formed on the lid body side or the body side. It's easy because it can be surely stored by simply joining the attachment surfaces, and because it is rectangular,
It is easy to correctly place the conductive material inside the case, and
Since the packing accommodating groove is formed separately in the case body and the lid, there is an advantage that a small outdoor installation type high frequency device can be provided. Moreover, after the outdoor type high frequency equipment of the present application is installed, there is no concern that the internal circuit will be damaged by rainwater, and the electromagnetic waves are electrically conductive at the joints of the joining surface and are spread across the joining surface. Since it is reliably shut off by the body, there is no concern about adverse effects on other equipment due to high frequency leakage, and no disturbing high frequency signals due to mixing of interfering waves, so it can be used in good condition for a long time There are also features. Further, even when such an excellent outdoor installation type high frequency device is manufactured, both measures of waterproofing and prevention of leakage and mixing of high frequency signals can be easily performed by mounting a single packing when manufacturing the device. Therefore, the working advantages during manufacturing are great.

[Brief description of drawings]

The drawings show the embodiments of the present application. FIG. 1 is a perspective view showing a mounting state of a CATV amplifier exemplified as an outdoor type high-frequency device, and FIG. 2 is a bottom view of the CATV amplifier with a lid removed. 3 and FIG. 3 are partial sectional views taken along the line III-III of the CATV amplifier of FIG. 1, FIG. 4 is a partially enlarged view of FIG. 3, and FIG. 5 is a partially enlarged perspective view of the packing. 1 ... Case body, 2 ... Lid, 8,9 ... Coupling part, 10, 11
…… Packing storage groove, 12 …… Packing, 13 …… Elastic body,
14 ... Conductor, 15 ... Screw rod, 16 ... Screw hole, 17 ... Through hole.

Claims (1)

[Claims] 1. An outdoor-installed high-frequency device comprising a conductive case body and a lid, both of which are provided with a high-frequency circuit inside the case body, wherein a main body side is provided at a joint portion between the case body and the lid body. A packing storage groove having a U-shaped cross section is provided on each of the opposing mating surfaces on the side of the lid and the lid, and the conductive body is superposed integrally on one side of the elastic body having a rectangular cross section. The molded string-like packing is housed so that the conductor faces the inside of the case and straddles the joining portion, and the case body and the lid body are joined together by using the joining and fixing means. Characteristic outdoor installation type high frequency equipment.