JPS646577Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sheet snowproof bag for a parabolic antenna device.

In recent years, reception of television broadcasts via satellite has begun to be implemented in many parts of the world. Satellite broadcasting is carried out using the SHF band and radio waves, and reflecting mirror antennas such as parabolic antennas and offset parabolic antennas are used for reception. These antennas are installed with the antenna reflection surface facing the satellite and have an elevation angle. For this reason, when it snows, snow adheres to the antenna reflecting surface, degrading antenna performance, and snow accumulation can deform and damage the reflecting mirror.
To prevent snow from accumulating on the antenna reflecting surface,
A method has been proposed in which a sheet-like bag is placed over the antenna to cover the antenna with the bag. As shown in FIG. 1, the bag 1 has its open end folded back and a cylindrical insertion hole 2 is provided on its periphery.A string 3 is passed through the insertion hole 2, and both ends of the string 3 are positioned outside the insertion hole 2. There is. FIG. 2 shows an example in which the bag 1 is attached to an offset parabolic antenna device. That is, code 4
5 is an offset parabolic reflector; 5 is a mast; A converter 8 is attached and connected directly to the primary radiator 7 . Here, the bag 1 is placed so as to accommodate the primary radiator 7, converter 8, and support fitting 6 from the reflecting surface side, and the opening of the bag 1 is made to cover the offset parabolic reflector 4 from the outer periphery to the back surface. , tie both ends of string 3. This completely prevents snow from adhering to the antenna reflecting surface during snowfall, but during fine weather in autumn or spring, the inside of bag 1 is almost completely sealed, so the temperature inside is quite low. As the temperature rises, the electronic components housed in the converter 8 become hot, their characteristics deteriorate, and they become unusable.
Therefore, in view of the above circumstances, this invention has a snow prevention effect equivalent to that of conventional ones, and in addition, it has a snow prevention function that prevents the electronic components housed in the converter from becoming hot when the temperature rises in good weather. It was developed for the purpose of providing a bag body, and the converter protrudes outward from an insertion hole provided at the bottom of the bag.

Hereinafter, the present invention will be explained in detail based on specific embodiments shown in FIGS. 3 to 8.

The bag body 9 is made of a sheet, and the sheet material is made of Tetron fabric coated with silicone rubber, or a synthetic resin with a low dielectric constant treated with Teflon, and the thickness is about 0.1 to 1 mm, and the cross section can be adjusted depending on the purpose. A conical bag whose shape is roughly conical, an oval bag,
It is formed into a so-called bag body or the like.

FIG. 3 shows a bag 9 according to an embodiment of the present invention. The opening end of the bag body 9 is folded back and a cylindrical insertion hole 10 is provided at the periphery of the bag body 9. A string 11 is passed through the insertion hole 10, and both ends of the string 11 are positioned outside the insertion hole 10. A converter 12 that inserts the converter 12 into the bottom side of the bag body 9 where the converter 12 is located.
An insertion hole 13 having approximately the same shape as the cross-section of is bored, and the periphery of the insertion hole 13 is lined with a lining 14 for reinforcement.

FIG. 4 shows an example in which the bag 9 is attached to an offset parabolic antenna device. Reference numeral 15 is an offset parabolic reflector, 16 is a mast, and a primary radiator 18 is mounted on the reflective surface side at the tip of a support fitting 17 extending forward from the back surface of the offset parabolic reflector 15.
is installed so that it is located at the focal point of the offset parabolic reflector 15, and a fifth
The converter 12 is connected to the converter 12 by interposing a disk-shaped overhanging plate 19 having a larger diameter than the primary radiator 18 as shown in the figure. This overhanging plate 19 is made up of two semicircular members, and since the connection part with the primary radiator 18 of the converter 12 is formed in a square shape, a square hole 20 is bored in the center to allow the connection part to be inserted therethrough. . Here, the bag body 9 is covered from the reflective surface side, the converter 12 is protruded outward from the insertion hole 13, the primary radiator 18 and the supporting metal fittings are accommodated, and the opening is covered from the outer periphery to the back surface of the offset parabolic reflector 15. ,
Tie and secure the string 11. The bottom of the sheet bag 9 is extended and supported in a predetermined circular shape by the overhang plate 19, so even if snow falls on the bag 9, the bag 9 will not be brought close to the primary radiator 18, and the antenna reflection surface will be The reflected radio waves reliably reach the primary radiator 18.

Next, an example in which the bag body 9 is attached to the upper part of the outer circumferential flange 21 of the offset parabolic reflector 15 with the spacer 22 interposed therein will be explained with reference to FIGS. 6 to 8. Note that other parts are the same as those in the previous embodiment. The spacing member 22 is an arc-shaped member along the outer periphery of the offset parabolic reflector 15, and has a V-shaped cross section, and is a mounting groove into which the outer flange 21 facing rearward from the outer periphery of the offset parabolic reflector 15 is fitted. 23 and an eaves piece 25. The mounting piece 24 of this spacing member 22 is attached to the outer peripheral flange 21 on the upper part of the offset parabolic reflector 15, and then the bag body 9 is covered in the same manner as described above. Then, since the upper outer peripheral edge of the offset parabolic reflector 15 is covered with the bag 9 with the spacing material 22 interposed, and the bag 9 is provided at a predetermined distance from the antenna reflecting surface, snow will not accumulate on the bag 9. However, the antenna performance is not degraded due to the deflection of the bag body 9.

In addition, in order to facilitate attachment and removal of the bag body 9, the insertion hole 1 is provided so that the bag body 9 can be expanded.
A fastener, numerous hooks, or string holes (not shown) are provided from the periphery of 3 to the opening. It is most desirable to provide this fastener, a large number of hooks, or string holes at the bottom when the bag 9 is attached to the parabolic antenna device, and operation is extremely easy by opening and closing the fastener, numerous hooks, or string holes. . Attachment is easy during snowfall, and even when the bag body 9 is removed when there is no snowfall, such as in summer, the cable remains connected to the converter 12 and can be removed.

As mentioned above, the present invention is a sheet snowproof bag body used in a parabolic antenna device in which a primary radiator is arranged at the focal point of a parabolic reflector and a converter is directly connected to the primary radiator. A sheet of parabolic antenna device in which the primary radiator is accommodated from the reflective surface side, its opening is positioned on the outer periphery of the parabolic reflector, and the converter protrudes outward from the insertion hole provided at the bottom. It is a snow-proof bag that completely prevents the antenna from adhering to the reflective surface during snowfall, and even if the temperature inside the bag rises during fine weather in autumn or spring, the converter containing electronic components does not protrude outside the bag. The antenna characteristics do not deteriorate at all because the temperature does not rise. This invention has a relatively simple structure with an insertion hole drilled in the bag body, and has a snow protection function as well as a function to prevent the electronic components stored in the converter from becoming hot when the temperature rises in good weather. Motsu.

[Brief explanation of the drawing]

Figures 1 and 2 show conventional examples. Figure 1 is a perspective view of a conventional bag, Figure 2 is a side view of the conventional bag attached to an offset parabolic antenna device, and Figures 3 to 8.
The figures show the present invention, FIG. 3 is a perspective view of an embodiment of the present invention, FIG. 4 is a side view of the bag shown in FIG. 3 attached to an offset parabolic antenna device, and FIG. FIG. 6 is a side view of another example in which the bag body is attached to an offset parabolic antenna device, FIG. 7 is a perspective view of the spacing member in FIG. 6, and FIG.
The figure is an enlarged vertical sectional view of the main part of FIG. 6. 15... Parabolic reflector, 8... Primary radiator,
12...Converter, 9...Sheet snowproof bag body,
13...Insertion hole.

Claims (1)

[Scope of utility model registration request] Place the primary radiator at the focus of the parabolic reflector,
A sheet snow-proof bag used for a parabolic antenna device in which a converter is directly connected to a primary radiator.The primary radiator is housed from the reflective surface side of the parabolic reflector, and its opening is located on the outer periphery of the parabolic reflector. What is claimed is: 1. A sheet snowproof bag for a parabolic antenna device, characterized in that the bag is formed so as to be able to be covered by the windshield, and has a converter protruding outward from an insertion hole provided at the bottom.