JPS5834803Y2 - Antenna feed section - Google Patents

Description

[Detailed description of the invention] This invention relates to the feeding part of an antenna used for receiving (or transmitting) television and other radio waves.
More specifically, the present invention relates to a structure that prevents water from adhering to internal circuit elements even if water enters the inside of the container body in the power feeding section.

Conventionally, in this type of structure, a through hole is formed in the bottom of the container body of the power supply section, and water that has entered the inside of the container body is discharged from the through hole.

However, if such a hole is provided, when the container body is exposed to strong winds, wind will blow into the inside of the container body through the hole, and this wind may contain moisture or salt. If there is, there is a problem that this may adhere to and damage circuit elements within the container body.

Therefore, the present invention has been improved in order to eliminate such problems.The antenna is designed to prevent wind from blowing in from the outside, even though water can be effectively extracted from the container body. The aim is to provide a power supply section for

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings 1 to 3 showing embodiments of the present application will be described below.

Reference numeral 1 denotes a container body, which is comprised of an assembled portion 1a and a lid 1b formed to be screwable to the assembled portion 1a.

Also, it is usually formed using a synthetic resin material.

2 is an element holding part, 3 is an insertion hole that is opened externally and is provided in the element holding part 2, 4 is a hollow pipe-shaped radiating element, 5 is a connection terminal, and 6 is a fastening tool for connection. The terminal 5 and the element 4 are fixed to the assembled part 1a of the main body 1, and are tightly inserted into the through hole 6a of the element holding part 2 to prevent water from seeping into the inside of the main body 1 from the element 4 side. be.

Further, this is made of a conductive material so as to electrically connect the element 4 and the connecting terminal 5.

Reference numeral 7 denotes a transmission line connection section, which is a transmission line such as a coaxial cable or feeder for transmitting signals, and as is well known, the transmission line is drawn into the main body 1 through a through hole drilled in the main body 1. It is designed to connect.

Reference numeral 8 denotes a balloon, which is connected between the transmission line connection section 7 and the connection terminal 5 as is well known.

Reference numeral 10 denotes a mounting portion for fixing a circuit element such as a balloon.

Reference numeral 11 denotes a coil, which is connected between the bases of the elements 4a, 4a on the side opposite to the reception direction in the radiation elements 4, 4 forming the folded dipole.

Next, reference numeral 12 denotes a boom, which is formed of aluminum or synthetic resin into any shape, such as a round cylinder as shown in the figure or a rectangular cylinder.

The boom 12 is generally arranged in a substantially horizontal position.

Further, the ends of the boom 12 are generally closed to the extent that air can flow therethrough.

Next, the attachment portion between the container body 1 and the boom 12 will be explained.

Reference numeral 13 denotes a fixing hole formed on the lower surface of the bottom plate of the phase part 1a, and has a threaded groove.

Reference numeral 15 denotes a fastener, and its threaded rod 16 is screwed into a fastening hole 13 through a through hole 14 drilled in the boom 12, thereby fixing the container body 1 to the boom.

Reference numeral 17 indicates a knob portion of the fastener 15.

Note that this fastening part may be of any other structure, for example, the phase part 1a.
A structure in which a threaded rod protruding from the lower surface of the boom 12 is inserted into a through hole 14 provided in the boom 12, and a thumbscrew is screwed into the protruding end of the rod may be used.

Next, reference numeral 18 denotes a through hole drilled in the boom 12, which is formed in a size that fits almost exactly into the outer diameter of a drain tube 19, which will be described below.

Reference numeral 19 denotes a water drain tube protruding from the bottom plate of the phase part 1a.
It is formed integrally with a.

The drain tubes 19, 19 are provided along the boom 12 and symmetrically with the fixing hole 13 in between.

20 is a hollow portion whose upper end communicates with the inside of the container body 1 and whose lower end opens into the inside of the boom 12, as shown in the figure.

In the power supply section having the above configuration, if water enters the main body 1 from the screwed part between the phase part 1a and the lid body 1b in the main body 1 or from the transmission line inlet, the water will be absorbed into the water drain tube 19. It is discharged into the inside of the boom 12 through the hollow part 20 of the boom 12.

This water is further discharged to the exterior of the boom 12 through various holes in the ends of the boom 12 or in the mast attachments formed on the boom 12 in a known manner.

Next, FIG. 4 shows an example in which the water drain tube is provided at a different position in the above-mentioned power supply section.

In this figure, the drain tube 29 is provided at only one location along the boom 12.

With this configuration, when the container body 1 is fixed to the boom 12, the direction can be instructed.

That is, in the state in which the left and right sides of the container body 1 are switched in FIG.
cannot be fixed to the boom 12.

Therefore, the container body 1 is always fixed to the boom 12 in the specified direction.

As a result, the elements that should be placed on the opposite side of the receiving direction in the radiating element can be placed at the same position, and the positional relationship between the radiating element and other elements such as waveguide elements or reflective elements can be made as designed. , it is possible to maintain good antenna characteristics and perform good reception.

Furthermore, the position of the transmission line inlet in the container body 1 can be kept constant, which also has the effect of facilitating the wiring operation of the transmission line.

In the case of the previous embodiment, such an effect can be similarly exerted by providing the two drain pipes 19, 19 at asymmetrical positions with the fixing hole 13 in between.

As described above, in this invention, a hollow cylindrical drain tube 19 is provided protruding from the bottom of the container body 1, and the hollow part 20 of the drain tube 19 is communicated with the inside of the container body 1. Therefore, even if water from rain or the like enters into the container body 1, it can be immediately extracted to the outside of the container body 1, thereby preventing the circuit elements provided inside the body from getting wet. It has the advantage of maintaining good electrical characteristics and suppressing the occurrence of rust.

Moreover, since the inside and outside of the container body 1 are communicated through the hollow part 20 of the water drain tube 19, it is difficult to connect the inside of the container body 1 to the outside, for example, when the antenna is installed outdoors.
After that, there was a sudden rain shower and the container body was cooled down.
Even when the air inside the main body contracts, the pressure inside the container main body 1 and the pressure of the outside air can always be kept equal, and the effect can prevent water droplets that adhere to various gaps in the main body 1 due to rain from being sucked in. There is also.

Moreover, even though the present invention allows air or water to flow in and out of the container body 1 through the drain tube 19 as described above, the lower end of the hollow part 20 in the drain tube 19 is connected to the hollow boom 12. Since it is opened inside the container body 1, even if this power supply part is exposed to wind mixed with rainwater or seawater, it is possible to block the water from blowing into the inside of the container body 1.
For example, it is possible to prevent accidents such as salty water adhering to the electrical elements inside the main body 1, maintain good electrical characteristics, and extend its life, allowing stable image reception over a long period of time. There are great advantages to doing so.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a perspective view of the power supply section with the lid removed, and FIG.
3 is a sectional view taken along the line -■ (inner circuit elements are omitted), FIG. 3 is a sectional view taken along the line -■ in FIG. 2, and FIG. 4 is a diagram similar to FIG. 2 showing a different example. 1...Container body, 4...Radiation element, 1
2...Boom, 19...Drain tube, 20
・・・・・・Hollow part.

Claims (1)

[Scope of utility model registration request] A hollow container body is fixed to the upper side of the boom, which is formed into a hollow cylindrical shape and is disposed in a substantially horizontal state, and a radiating element is protruded from the container body. At the bottom of the container body, a hollow cylindrical drain tube is provided to protrude downward from a position along the boom, and the hollow part of the drain tube is communicated with the inside of the container body. A through hole is bored at a position facing the drain tube, the drain tube is inserted through the hole, and the lower end of the hollow part of the drain tube is opened into the hollow boom. Antenna power feed.