JPH0680970B2 - parabolic antenna - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a parabolic antenna, and more particularly to a parabolic antenna suitable for preventing a decrease in reception efficiency of the parabolic antenna.

[Background of the Invention]

Generally, when satellite broadcasting is received by a parabolic antenna, the receiving efficiency is greatly affected by the accuracy of the parabolic surface and the mounting position accuracy of the converter and the parabolic surface. From this,
In order to prevent the reception efficiency from decreasing, it was necessary to mount it with high accuracy and maintain the accuracy of the parabolic surface as follows.

In general, the mounting position accuracy of the parabolic surface and converter is (Λ is the wavelength of the radio wave, and the wavelength of the 12GH radio wave used for satellite broadcasting is about 2.5 cm. Is. ) It is necessary to maintain a high-precision positional relationship.

First, a first conventional example will be described with reference to a side view and a rear view showing the mounting state of the parabolic antenna in FIGS.

The parabolic surface 20 has an assembling portion 21 and a reinforcing rib 26 on the back surface.
And are integrally formed. Reference numeral 22 denotes a mounting metal fitting, which is fastened to the assembly portion 21 with a screw and mounts the parabolic surface 20 to the column 23. The mounting arm 24 of the converter 2 is assembled to the flange of the parabolic surface 20, is evenly supported from the parabolic surface, and maintains positional accuracy at three points. In this case, the support rods 25 supporting the converter arm 24 attached to the lower part of the flange are assembled to the left and right flanges at a height position of about 1/3 of the upper part of the parabolic surface 20.

The support rod 25 needs to have a curved shape so as not to block radio waves incident on the parabolic surface 20. In addition, when the parabolic surface 20 receives wind pressure due to strong wind, the bending moment concentrates on the boundary between the assembly part 21 and the parabolic surface 20 formed on the back surface of the parabolic surface 20, and the parabola is centered around this boundary part. The surface 20 is distorted and may be permanently deformed. In addition to this, since the converter 2 is mounted by the converter mounting arm 24 mounted on the lower portion of the flange as described above, the bending moment is concentrated on the lower flange, and the parabolic surface is distorted similarly to the above.・ There was a risk of permanent deformation. If the parabolic surface is distorted or permanently deformed, the reception efficiency will decrease.

As shown in Fig. 5 and Fig. 6, the thickness of the parabolic surface 20 is increased and the reinforcing ribs 26 are added to prevent the elastic deformation and permanent deformation of the parabolic surface due to the strong wind. Was supported in a wide range to increase the strength. However, this used a large amount of material and had a complicated structure.

On the other hand, the mounting arm 24 of the converter 2 is mounted on the flange surface of the parabolic antenna, and further, the converter arm supporting rods 25 support the flanges on both sides of the parabolic surface 20 at three points to mount the converter 2 and the parabolic surface 20. It gives precision. However, in this case, the reception efficiency is reduced due to the irregular reflection of the radio waves on the converter arm support rod 25.

Further, in the second conventional example shown in FIGS. 7 and 8, in order to avoid the deformation of the parabolic surface 20 due to the wind pressure due to the strong wind applied to the converter 2 and the converter mounting arm 24, the following configuration is adopted. That is, in some cases, the bending moment of the wind pressure applied to the converter 2 is applied to the mounting bracket 22, and the converter mounting arm 24 is directly mounted to the mounting bracket 22 or the parabolic surface fixing tool 27 in order to avoid affecting the parabolic surface 20. . However, in this case, the following configuration was required to obtain the mounting position accuracy of the parabolic surface 20 and the converter 2. The mounting position accuracy of the parabolic surface 20 and the converter 2 is the positional accuracy of the parabolic surface 20 and the parabolic surface fixing tool 27, the positional accuracy of the parabolic surface fixing tool 27 and the mounting bracket 22, the position of the mounting bracket 22 and the converter mounting arm 24. The accuracy and all the mounting accuracy of the converter mounting arm 24 and the converter 2 must be extremely high. in this case,
The precision of each part, especially the machining of the mounting surface of each part, requires a very precise work and the part structure is large.
Was needed.

As described above, it is extremely difficult for the conventional parabolic antenna to reduce the decrease in reception efficiency.

[Object of the Invention]

An object of the present invention is to provide a parabolic antenna with less deterioration in reception efficiency.

[Outline of Invention]

The above-mentioned purpose is a parabolic surface provided with a flange on the outer periphery,
An upper mounting arm fixed to the flange at the upper and lower positions of the parabolic surface and a mounting metal piece integrally formed with a lower mounting arm are provided, and the mounting arm is fixed to the flange at the fixing portions at both ends in the horizontal direction. This can be achieved by using a fixed parabolic antenna.

Example of Invention

 An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows a front view in which an offset type parabolic antenna is attached to a column 16, and a converter 2 is attached to a focal portion of the offset type parabolic antenna.

FIG. 2 is a side view in which the parabolic surface 1 of FIG. 1 is a partial cross-sectional view, and the parabolic surface 1 has the upper and lower portions of the flange in the longitudinal axial direction, and the above-mentioned flange of the mounting bracket 3 shown in FIG. It is fixed to an upper mounting arm 17 and a lower mounting arm 18 which are horizontally provided at positions corresponding to the upper and lower portions of the. As shown in FIG. 4, the upper mounting arm 17 has fastening screw holes 17 'for fixing at its horizontal ends, and the lower mounting arm 18 has similar fastening screw holes 18'. is doing. The fixing of the mounting member 3 and the parabolic surface is not limited to the flange, but may be the upper part and the lower part of the parabolic surface near the flange. This is because the outer periphery of the parabolic surface and the flange interact with each other, and the outer periphery of the parabolic surface and the flange have high strength. The converter 2 is placed on the converter mounting arm 19 so that it comes to the focal point of the parabolic surface 1.
It is fixed to the tip of the through a screw hole 19 'by a screw. Then, as shown in the detailed view of the screw fastening portion shown in FIG. 3, the mounting bracket 3, the U-bolt 6 and the fixture 7 are attached to the pillar 16 of the antenna.
And the wing nut 8 is screwed.

In addition, the lower curved portion of the mounting bracket 3 is attached to the long U bolt 9
And U-bolt fixing tool 10 and wing nut 11 are screwed together, and then post fixing tools 13 and 14 and wing nuts 12 and 15 are used to adjust the elevation angle of the parabolic antenna directivity, and then wing nut 15 is tightened. And tighten the screws.

The azimuth adjustment of the parabolic antenna can be adjusted by the support during installation for reception.
It can be done by rotating 16 but the wing nut 8
The directionality of the parabolic antenna is adjusted by adjusting the azimuth angle before fastening and then adjusting the elevation angle.

According to the present embodiment, first, since the flange portion having high strength or the vicinity of the flange portion is fixed to the mounting member, there is no possibility of permanent deformation and damage even when receiving strong wind. Therefore, the thickness of the parabolic surface can be made thin, and the reinforcing ribs need not be provided, the amount of material used can be reduced, and the structure can be simplified. Secondly, since the converter mounting arm is not fixed to the parabolic surface, the parabolic surface is not affected even when a strong wind is received. This also eliminates the need to reinforce the parabolic surface, reduces the amount of material used, and simplifies the structure. Third, the parabolic antenna mounting bracket 3 in which the converter mounting arm 19 is integrally formed
As a result, the mounting structure can be simplified, the mounting accuracy between the parabolic surface 1 and the converter 2 can be improved, and the diffuse reflection of radio waves can be prevented, so that a parabolic antenna with good reception performance can be configured. Fourthly, the mounting bracket 3 of the present invention makes it possible to attach the U-bolt and the fixture to the antenna support column 16 at two positions vertically by taking advantage of the verticality and the axial direction of the antenna support column 16 being also above and below. In addition, the azimuth can be arbitrarily adjusted by making the pillar 16 cylindrical. Fifthly, since the reference surface when the parabolic surface 1 of the present invention is molded is used to process the mold by using the place where the flange portion and the parabolic surface 1 contact each other, when fixing the flange portion and the mounting bracket 3, Positional accuracy can be easily obtained from the reference plane, and mounting holes can be easily processed with high accuracy. Sixthly, when the parabolic surface deforming force is fixed to the upper and lower flange portions of the parabolic surface when a wind pressure due to a strong wind is applied, a plurality of horizontally-spaced upper mounting arms 17 are provided. The tightening screw hole 17 'and the hole pitch of each of the plurality of tightening screw holes 18' similarly provided in the lower mounting arm 18 are narrowed to the extent that the parabolic surface does not cause permanent deformation in accordance with the strength of the parabolic surface. Since the force applied to the parabolic surface is transmitted to the strut 16 through the mounting bracket, and the force of the converter is similarly transmitted to the strut through the mounting bracket, each force is separately transmitted to the strut and the parabolic surface 1 It has the advantage of not causing deformation. Seventh, by using the parabola antenna mounting bracket 3 with the converter mounting arm integrated according to the present invention, it is possible to reduce the number of mounting screws for mounting the parabolic surface and the converter to at least two, usually 4 to 5 screwing points. It is possible to reduce the number of screw tightening points that cause deterioration in assembly accuracy.

〔The invention's effect〕

According to the present invention, since the flanges having high strength are attached to the fixed portions at both ends in the horizontal direction of the upper mounting arm and the lower mounting arm, the parabolic surface is not easily deformed and a force such as a strong wind is received. In this case, the pitch of the fixed portions can be set within a range in which the parabolic surface does not cause permanent deformation, so that it is possible to provide a parabolic antenna with less deterioration in reception efficiency.

[Brief description of drawings]

FIG. 1 is a front view in which an offset type parabolic antenna according to an embodiment of the present invention is attached to a column 16 of the antenna, and FIG.
The drawing is a side view of the parabolic surface 1 of the offset parabolic antenna of FIG. 1 with a partial cross-sectional view, FIG. 3 is a detailed view of a screw fastening portion using a U bolt and a fixture, and FIG. 4 is a converter mounting arm integrated type. It is a perspective view of an example of parabola antenna mounting bracket 3. FIG. 5 is a side view in which a parabolic surface showing a mounting state of the parabolic antenna of the first conventional example is partially sectioned, FIG. 6 is a rear view showing a rear surface of FIG. 5, and FIG.
FIG. 8 is a side view showing a partial cross section of a parabolic antenna supporting a parabolic surface of the conventional example, and FIG. 8 is a rear view of FIG. 1 ... Parabolic surface, 2 ... Converter, 3 ... Converter mounting arm-integrated parabolic surface mounting bracket, 4 ... Screw, 5 ... Screw, 6 ... U bolt, 7 ... Strut fixture,
8 …… Bow nut, 9 …… U bolt, 10 …… U bolt fixing tool, 11 …… Bow nut, 12 …… Bow nut, 13 …… Brace fixing tool, 14 …… Brace fixing tool, 15 …… Butterfly Nuts, 16 ... stanchions,
17 …… Upper mounting arm, 18 …… Lower mounting arm, 17 ′ ・
18 '... tightening screw hole, 19 ... converter, 20 ... parabolic surface, 21 ... mounting part, 22 ... mounting bracket, 23 ... prop, 24
...... Converter mounting arm, 25 …… Support rod, 26 …… Reinforcing rib, 27 …… Parabolic surface fixing tool.

Claims (1)

[Claims] 1. A parabolic surface having a flange on an outer periphery thereof, and a mounting metal fitting integrally formed with an upper mounting arm and a lower mounting arm fixed to the flange at upper and lower positions of the parabolic surface, respectively. A parabolic antenna, wherein the mounting arm is fixed to the flange at fixing portions at both ends in the horizontal direction.