JPH0529829A - Offset parabola antenna - Google Patents

Abstract

PURPOSE:To make it possible to easily confirm whether the trees or others existing in front of a reflection mirror become obstacles in a radio wave passing area or not in an offset parabola antenna in which the radio wave passing area from a satellite to the reflection mirror and the mechanical front area of the reflection mirror differs. CONSTITUTION:Marks are provided on the lower part of a reflection mirror 4 and the tip part side of an arm 5 extending from the reflection mirror 4, respectively. The marks are provided on the position where a straight line connecting the both of them is parallel to the center axis of a radio wave passing area. When an object which may be an obstacle in front of the reflection mirror 4 exists, the front is seen through the both marks. If the front is deviated from the line of sight, it can be confirmed that the object does not become an obstacle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset parabolic antenna for receiving radio waves coming from satellites such as broadcasting satellites and communication satellites.

[0002]

2. Description of the Related Art In this type of offset parabolic antenna, a fixture for attaching it to a fixed object is provided with a structure for indicating the elevation angle of the antenna. Therefore, by adjusting the elevation angle so that the indicated value becomes a predetermined angle, it is possible to obtain an appropriate elevation angle with respect to the satellite.

[0003]

However, in this type of offset parabolic antenna, since the radio wave passing area from the satellite to the reflecting mirror and the mechanical front area perpendicular to the front surface of the reflecting mirror are different from each other, in the installed state, The mechanical front region is in a relatively low direction, for example, in a state of being substantially right beside. Then, there is a problem that the worker who installed the antenna is worried that there is a tree or other obstacle in front of the reflector and the electric wave to the reflector is blocked.

The present invention has been made in order to solve the above-mentioned problems (technical problems) of the prior art. By providing a pair of marks indicating the direction of the radio wave passage area from the satellite to the reflector, It is an object of the present invention to provide an offset parabolic antenna capable of eliminating the anxiety by easily confirming that the tree is not obstructed by looking forward through these marks.

[0005]

In order to achieve the above object, an offset parabolic antenna according to the present invention comprises:
The radio wave passage area from the satellite to the reflecting mirror and the mechanical front area perpendicular to the front surface of the reflecting mirror have an offset type reflecting mirror, and in the reflecting mirror, from the side which is lower in its installed state, In an offset parabolic antenna in which an arm extends toward the front of the reflecting mirror, and a primary radiator for receiving the radio wave reflected by the reflecting mirror is attached to the tip of the arm, Marks for indicating the direction of the radio wave passage area are provided on the lower part and the tip side of the arm, and the position of these marks is such that the straight line connecting both marks is parallel to the central axis of the radio wave passage area. It is set at the position where

[0006]

[Function] When the antenna is installed, the front side is viewed through the two marks. If there is no obstacle in that direction, it can be confirmed that there is no obstacle in the radio wave passage area for the reflector.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes an offset parabolic antenna, which is shown in a state in which it is attached to a column 2 standing on the ground by a fixture 3. As is well known, the fixture 3 has a structure capable of adjusting an elevation angle and an azimuth angle, and is provided with a structure showing the magnitude of the elevation angle. Next, 4 is an offset type reflecting mirror in the antenna 1, the back surface of which is attached to the fixture 3. Reference numeral 5 denotes an arm, the base of which is attached to the fixture 3, and extends from the lower side of the reflecting mirror 4 toward the front of the reflecting mirror 4. Reference numeral 6 is a primary radiator mounted on the tip of the arm 5. Reference numeral 7 is a satellite that emits radio waves, 8 is a radio wave passage region from the satellite 7 to the reflector 4, that is, a region of the radio waves emitted from the satellite 7 that is received by the reflector 4, and 9 is a reflector 4. It shows a mechanical front region at right angles to the front surface, and as is well known in the offset type reflecting mirror 4, the two directions are different. In addition, 10 is a building and 11 is a tree. Next, 14 in FIG. 3 indicates the presence of a mark provided on the lower portion of the reflecting mirror 4, and in this example, the reflecting mirror 4
The lower peripheral edge 15 and the side surface 16 of the arm 5 intersect each other. Reference numeral 17 in FIG. 2 indicates a mark provided on the tip side of the arm 5, which is provided on the primary radiator 6 in this example. You may prepare for the arm 5. Although the mark 17 is formed in the shape of a protrusion, it may be formed in the shape of a recess, may be marked by a printing means, or may be marked with a sticker. The mark 14 on the lower part of the reflecting mirror and the mark 17 on the arm tip side are set at a position where a straight line connecting them is parallel to the central axis 8a of the radio wave passage area 8. Reference numeral 18 is a radio wave receiving portion of the primary radiator 6, 19 is an output terminal, and 4a is a reinforcing rib around the reflecting mirror 4, respectively.

Next, confirmation of the presence or absence of an obstacle when the parabolic antenna 1 is installed will be described. Installer
When the antenna 20 is installed as shown in FIG. 1, for example, an arbitrary rod 21 is attached to both the marks 14 and 17 so that the straight line connecting the marks 14 and 17 can be easily understood. . The bar 21 may be attached to the mark 14 in a state where the bar 21 is in contact with both the peripheral edge 15 and the side surface 16 as shown in FIG. In this state, the rod body as shown in FIG.
By looking into the direction of 21 and confirming that there are no trees 11 or other obstacles in the line-of-sight direction 22, it is confirmed that the trees 11 and others do not enter the radio wave passage area 8 and are not obstacles. . In the case of the above work, the absence of the obstacle may be confirmed by looking through the front such that the marks 14 and 17 overlap without using the rod 21.

The lower mark of the reflecting mirror may be formed in a part of the rib 4a in the lower part of the reflecting mirror 4 in the same manner as the mark 17 as shown by reference numeral 23 in FIG.

Next, FIG. 4 shows a different embodiment of the present invention, in which the mark on the lower part of the reflecting mirror is located on the peripheral part of the lower part of the reflecting mirror 4e which does not affect the reflection of radio waves and the mechanical strength of the reflecting mirror. It shows an example formed in the form of through holes 24. The through hole 24 is preferably as small as possible so as not to affect the reflection of the radio wave and the mechanical strength, and it is preferable to form the through hole 24 in such a size that an operator can easily look into it. Good. In addition, parts that are considered to be the same or equivalent in configuration to those in the previous figure in terms of function are denoted by the same reference numerals as those in the previous figure with the letter e added to omit redundant description. (Also, in the following figure, the same letter is added to the letter "f" to omit the duplicated explanation.)

Next, FIG. 5 shows a further different embodiment of the present invention, showing an example in which a part of the arm 5f is formed in a linear shape. This straight line portion 25 is the central axis 8af of the radio wave passage area 8f.
Parallel to. In addition, 26 indicates a veranda of the building and 27 indicates the fence. With such a configuration, it is possible to confirm whether or not there is an obstacle in the radio wave passage area 8f by looking ahead along the straight line portion 25 as shown in the figure.

[0012]

As described above, according to the present invention, when the installation of the parabolic antenna 1 is completed, the mechanical front area 9 of the reflecting mirror 4 has a tree 11 or other objects that may cause obstacles. By looking at the direction connecting the two through the marks 14 and 17, there is a usefulness that it is possible to obtain a sense of security that the line of sight 22 is not an obstacle if it is above the above line of sight. If 22 hits the above object, that object will be an obstacle, so it is possible to prompt the change of the installation location of the antenna and it is possible to prevent reception failure due to improper installation location of the antenna in advance. .

Moreover, since the mark 14 on the side of the reflecting mirror 4 is provided below the reflecting mirror 4, in the above case, the line of sight 22 has a feature that it always passes below the entire radio wave passage area 8. This means that if the line-of-sight 22 passes over an object such as the tree 11, the object will never enter the radio wave passage area 8. This is extremely reliable and is an obstacle as described above. There is a usefulness that can be confirmed.

[Brief description of drawings]

FIG. 1 is a diagram showing an installation state of an antenna and a confirmation state of presence / absence of an obstacle.

FIG. 2 is an enlarged perspective view of a main part in the state of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a vertical sectional view of a lower portion of a reflecting mirror showing another embodiment.

FIG. 5 is a view similar to FIG. 1 showing still another embodiment.

[Explanation of symbols]

4 reflector 5 arms 6 Primary radiator 8 radio wave passage area 9 Mechanical front area 14, 17 Mark

Claims (2)

[Claims] 1. An offset-type reflecting mirror having a radio wave passage region from a satellite to the reflecting mirror and a mechanical front region perpendicular to the front surface of the reflecting mirror is different. In the offset parabolic antenna, an arm extends from the side to the front of the reflecting mirror, and a primary radiator for receiving the radio wave reflected by the reflecting mirror is attached to the tip of the arm. The lower part of the reflecting mirror and the tip side of the arm are provided with marks for indicating the direction of the radio wave passage region, and the positions of these marks are such that the straight line connecting both marks is the radio wave passage region. An offset parabolic antenna characterized by being positioned at a position parallel to the central axis of. 2. An offset type reflection mirror having a radio wave passage area from the satellite to the reflection mirror and a mechanical front area perpendicular to the front surface of the reflection mirror, wherein the reflection mirror has a lower position in the installed state. In the offset parabolic antenna, an arm extends from the side to the front of the reflecting mirror, and a primary radiator for receiving the radio wave reflected by the reflecting mirror is attached to the tip of the arm. An offset parabolic antenna, wherein a part of the arm is formed in a linear shape, and the linear portion is parallel to the central axis of the radio wave passage area.