JPH0526362B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] In order to accurately assemble a small-diameter parabolic antenna, a special integrated support structure (back structure) for attaching the main reflector, sub-reflector, and primary radiator is used. Construct using an assembly jig. In that case, align the mounting surfaces of other parts with the mounting surface of the main reflecting mirror as a reference.

[Industrial application field]

The present invention relates to a method of assembling an antenna, and more particularly to a method of assembling a small-diameter parabolic antenna for satellite communication, which is equipped with parts such as a sub-reflector and a primary radiator in addition to a main reflector.

[Conventional technology]

In small-diameter parabolic antennas for satellite communications, high positional accuracy is required for the mounting positions of components such as the main reflector, sub-reflector, and primary radiator. In particular, in this type of offset parabolic antenna for satellite communication, there is no standard axis of symmetry, so it is necessary to finish the mounting surface of the antenna parts with high precision by machining to maintain the positional accuracy of the parts.
Alternatively, it is common to construct a movable mechanism by combining the mounting parts of the parts with elongated holes, etc., and to adjust the mounting position of each part using a predetermined jig during assembly to ensure positional accuracy. Ta.

[Problem that the invention seeks to solve]

However, in the conventional method of assembling antenna parts as described above, the machining method requires a large machine tool such as a three-dimensional milling machine, and the processing cost is high. Furthermore, a structure in which the mounting portion is a movable mechanism requires a large number of assembly and adjustment steps, and there are problems in that the reproducibility of the mounting position when parts are replaced is not guaranteed. SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a structure that positions antenna components in an inexpensive manner and guarantees reproducibility of the mounting position even when replacing components.

[Means for solving problems]

In order to solve these problems, the present invention provides an integrated support structure having mounting surfaces for mounting other antenna components such as a sub-reflector and a primary radiator in addition to the main reflector. This support structure is temporarily joined using a body with the relative positions of each mounting surface being rough, and this support structure is mounted on an assembly jig that has respective reference surfaces corresponding to the mounting surfaces of each component. Then, after aligning the mounting surface of the main reflector with the corresponding reference surface of the assembly jig and precisely aligning the mounting surfaces of other antenna components with the respective reference surfaces of the assembly jig, firmly secure the support structure. A method of assembling a small-diameter parabolic antenna is provided, which includes bonding and attaching a main reflector and other antenna components to the support structure.

[Effect]

In the present invention, since the mounting surface of other antenna components such as the sub-reflector and the primary radiator is regulated based on the mounting surface of the main reflector, which is the most standard for parabolic antennas, the main reflector of each antenna component It is possible to easily and accurately determine the relative position of the object.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, a small-diameter parabolic antenna for communication sanitary use to which the present invention is applied will be explained with reference to FIGS. 3 and 4. This antenna is an offset type antenna with a diameter of 1.2 m, and has a main reflector 10, a sub-reflector 11, and a radio device 12 integrated with a primary radiator. These are mounted with high precision (±0.5 mm or less) by an integrated support structure 13 (hereinafter referred to as back structure) as described below. Back structure 13 is pivot point 1
At 7, it is attached to a mount 14 so that its angle can be adjusted, and is further supported by a base 15. The backstructure 13, ie the angle of the antenna, can be adjusted by an angle adjustment device 16.

The back structure 13 includes a triangular frame portion 13a for attaching the main reflector 10, a frame portion 13b extending at a certain angle from the root of this frame portion 13a for attaching the sub-reflector 11, and a primary frame portion 13b for attaching the sub-reflector 11. It consists of a frame portion 13c for mounting the wireless device 12 integrated with the radiator. The triangular frame portion 13a to which the main reflecting mirror 10 is attached has three portions 21, 2 that form approximately apexes.
Attach the main reflecting mirror 10 at steps 2 and 23. Each part 2
1, 22, 23 have a mounting surface A defined by the same plane, and each part 21, 23 is also provided on the back surface of the main reflecting mirror 10.
It has three mounting surfaces defined by the same plane A corresponding to 22 and 23. At the tip of the frame portion 13b for attaching the sub-reflector 11, a mounting surface B is defined that is parallel to the mounting surface A of the main reflector 10 or inclined at a certain angle. The main reflecting mirror 10 and the sub-reflecting mirror 11 are fixed at each mounting surface A, B using well-known means such as bolts.

Frame portion 13c for mounting the wireless device 12 integrated with the primary radiator 17 (FIG. 5)
As shown in FIGS. 5 and 6, the L-shaped member 13c is made of two parallel L-shaped members, and these L-shaped members 13c form a certain angle at the base of the back structure 13, that is, the sub-reflector. 11 is attached parallel to and opposite to the frame portion 13b. The radio device 12 itself has a cylindrical shape, is supported by front and rear flanges 26 integral with a support fitting 25, and is fixed with a holding band 32 (FIG. 6). Support fittings 25 on both sides of the wireless device 12
As shown in detail in FIG. 7, it has a relatively large relief hole 27 for mounting, and a fixing pin bolt 29 is inserted into the tap hole 3 of the L-shaped member 13c via a washer 28.
0, and after accurately adjusting the position of the wireless device 12, the pin bolt 29 is strongly tightened and the washer 28 is fixed to the metal fitting 25 by welding (31).
Note that the mounting reference planes for the primary radiator 17 are the two parallel flanges 3 in front of the wireless device 12.
3 and 34, the mounting surfaces C and D (Fig. 1 and Fig. 8).

Figures 1 and 2 show the back structure 13.
A jig 40 for positioning is shown, and the back structure 13 itself is shown in phantom lines. The main body of this jig 40 is made of a steel frame, and the main reflector 10 defined by a horizontal plane is provided on the upper part.
It has a reference surface a corresponding to the mounting surface A of. This reference plane a is located at the three mounting points 21 and 2 of the main reflecting mirror 10.
2 and 23, there are 3 locations on the same plane a (4
1, 42, 43) provided. A reference surface b corresponding to the mounting surface B of the sub-reflector 11 is provided in a parallel or inclined part at a certain angle descending from the reference surface a in a stepwise manner.
has. The position of this surface b is accurately set in advance with reference to the mounting reference surface a of the main reflecting mirror 10. The reference planes c and d corresponding to the mounting planes C and D of the primary radiator 17 are composed of two parallel inclined frames 46 and 47 extending downward at a predetermined angle from the vertical frame 45 of the main body of the jig 40. . Reference planes c and d are provided at the tips of these inclined frames 46 and 47.
has. Grooves 46a and 47a through which the dummy 17' of the primary radiator 17 passes are formed in these reference planes c and d.
(Fig. 8) is provided. Note that this reference plane c,
d is also accurately set in advance with reference to the mounting reference plane a of the main reflecting mirror 10. It goes without saying that each reference surface is precisely finished by machining or the like.

First, the metal fittings and the like constituting the mounting surfaces A, B, C, and D are temporarily joined to the main body frame of the back structure 13 by welding, with their relative positions being rough. Then, it is mounted on the jig 40,
Align with the corresponding reference planes a, b, c, and d, respectively. At that time, after precisely aligning the mounting surfaces of the sub-reflector 11 and the primary radiator 17 with the mounting surfaces B, C, and D of the jig 40 using the mounting surface A of the main reflecting mirror 10 as a reference,
The metal fittings that make up each mounting surface A, B, C, and D are spot welded to the main body frame of the back structure 13.
Strongly joined by rivets, caulking, etc. Note that the wireless device 12 integrated with the primary radiator 17
When adjusting the reference planes c and d for mounting, use dummies 12' and 17' of sizes and shapes corresponding to the wireless device 12 and the primary radiator 17,
Align the mounting reference surfaces c and d accurately. This dummy has flanges 33, 34 defining mounting surfaces C, D corresponding to the main body.

The radio device 12 integrated with the main reflecting mirror 10, the sub-reflecting mirror 11 and the primary radiator 17, or other antenna parts is attached to the back structure 13 constructed in this manner in the manner described above.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to roughly fabricate the back structure, which is the supporting structure, without worrying about the dimensional accuracy, and moreover, by using a special assembly jig, it is possible to create a back structure that is the most standard for parabolic antennas. Since the mounting surfaces of the sub-reflector and the primary radiator are regulated with respect to the mounting surface of the main reflector, the positions of the respective components relative to the main reflector can be regulated easily and accurately. Therefore, a high-precision antenna with low manufacturing cost can be obtained, and the reproducibility of the mounting positions of parts can be guaranteed even when parts are replaced.

[Brief explanation of the drawing]

FIG. 1 is a side view of an assembly jig used in the present invention;
Figure 2 is a plan view of the assembly jig, Figure 3 is a rear view of the parabolic antenna to which the present invention is applied, Figure 4 is a side view of the parabolic antenna, and Figure 5 is viewed from the arrow in Figure 4. Fig. 6 is a diagram of the mounting part of the radio device as seen from the arrow in Fig. 4;
7 is a detailed view of the portion shown in FIG. 6, and FIG. 8 is a sectional view taken along the line - in FIG. 1. 10...Main reflecting mirror, 11...Sub reflecting mirror, 12...
...Radio device, 13...Support structure (back structure), 17...Primary radiator, A, B, C,
D...Mounting surface, a, b, c, d...Mounting reference surface.

Claims (1)

[Claims] 1 In addition to the main reflector, an integrated support structure is used that has mounting surfaces for attaching other antenna parts such as a sub-reflector and a primary radiator, and this support structure is connected to the positional relationship of each mounting surface. are temporarily joined together in a rough state, and this support structure is mounted on an assembly jig that has respective reference surfaces corresponding to the mounting surfaces of each component, and the mounting surface of the main reflector is aligned with the corresponding reference surface of the assembly jig. After precisely aligning the mounting surfaces of other antenna parts with the respective reference surfaces of the assembly jig, the support structure is firmly connected, and the main reflector and other antenna parts are attached to this support structure. A method for assembling a small-diameter parabolic antenna characterized by attaching it to a.