JP2023177646A - Parabolic antenna device and method for manufacturing parabolic antenna device - Google Patents

Abstract

To provide a parabolic antenna device that can be easily assembled even without a center dividing body.SOLUTION: A parabolic antenna device includes a parabolic reflector 2 that is formed in a bowl shape and has a concave reflecting surface 12, and is formed with a through hole 14 in the center of the reflecting surface, an antenna base 3 arranged on the outer surface 13 side of the parabolic reflector and having a flat surface 31 orthogonal to the axial direction of the through hole, and a positioning insertion portion 4 fixed to the antenna base and formed into a column shape extending in a direction perpendicular to the flat surface and inserted into the through hole. The parabolic reflector includes a plurality of circumferentially divided bodies 20 arranged in the circumferential direction thereof and each having an inner edge surface 201 that constitutes a part of the inner circumferential surface 15 of the through hole in the circumferential direction. The positioning insertion portion has an outer circumferential surface 41 that faces the inner circumferential surface when inserted into the through hole. The antenna base includes a holding portion 34 that holds the plurality of circumferentially divided bodies.SELECTED DRAWING: Figure 8

Description

The present invention relates to a parabolic antenna device and a method for manufacturing the parabolic antenna device.

Parabolic antenna devices are used in weather radar, satellite communications, radio telescopes, etc. Patent Document 1 discloses a parabolic antenna device that includes a parabolic reflecting mirror formed in a bowl shape and a radiator that radiates electromagnetic waves toward the inner surface of the parabolic reflecting mirror. In the parabolic antenna device of Patent Document 1, the parabolic reflecting mirror is configured by connecting a central dividing body disposed at the center and a plurality of circumferential dividing bodies arranged around the central dividing body. With such a configuration, a plurality of circumferential division bodies can be positioned with respect to the central division body.

JP 2019-134275 Publication

By the way, in a parabolic antenna device, in consideration of reducing the number of parts and manufacturing cost, it has been considered to configure a parabolic reflecting mirror without using a center dividing body. However, if there is no central dividing body, there is a problem in that it is difficult to assemble a parabolic antenna device including a parabolic reflector.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a parabolic antenna device and a method for manufacturing the parabolic antenna device that can be easily assembled even without a central dividing body.

A parabolic antenna device according to one aspect of the present invention includes a parabolic reflecting mirror formed in a bowl shape and having a concave reflecting surface, and a through hole formed in the center of the reflecting surface, and an outer surface of the parabolic reflecting mirror. an antenna base disposed on the side and having a flat surface perpendicular to the axial direction of the through hole; and an antenna base fixed to the antenna base and formed in a column shape extending in a direction perpendicular to the flat surface, and inserted into the through hole. and a positioning insertion portion. The parabolic reflecting mirror is arranged in a circumferential direction of the parabolic reflecting mirror and includes a plurality of circumferentially divided bodies each having an inner edge surface that constitutes a part of the inner circumferential surface of the through hole in the circumferential direction. The positioning insertion portion has an outer circumferential surface that faces the inner circumferential surface when inserted into the through hole. The antenna base includes a holding portion that holds the plurality of circumferentially divided bodies.

In the parabolic antenna device having the above configuration, it is possible to position the plurality of circumferentially divided bodies with reference to the flat surface of the antenna base and the positioning insertion portion. Therefore, it is possible to easily assemble a parabolic antenna device that does not have a center dividing body.

In the parabolic antenna device, an outer circumferential surface of the positioning insertion portion may contact at least two inner edge surfaces of the plurality of circumferentially divided bodies arranged in the circumferential direction.

In the above configuration, even if the axis of the through hole of the parabolic reflector is not clear due to the step between the inner edge surfaces adjacent to each other in the circumferential direction, the axis of the positioning insertion part inserted into the through hole is passed through. It can be set as the axis of the hole (i.e. the axis of the parabolic reflector). This makes it possible to clarify the axis of the parabolic reflector.

Further, in the parabolic antenna device, a positioning hole is formed in the holding part and the circumferentially divided body held by the holding part, and the positioning hole is formed in both the holding part and the circumferentially divided body. The device may further include a positioning pin inserted into the device.

In the above configuration, even after the parabolic reflector is disassembled into a plurality of circumferentially divided bodies, by passing the same positioning pin through the positioning hole of both the holding part and the circumferentially divided body, it is possible to The parabolic reflecting mirror can be easily assembled without relative positioning of the circumferentially divided bodies.

A method for manufacturing a parabolic antenna device according to one aspect of the present invention is a method for manufacturing the parabolic antenna device, comprising: placing the antenna base on the flat mounting surface such that the flat surface is in surface contact with the flat mounting surface. a mounting step of placing the plurality of circumferentially divided bodies on the antenna so that the inner edge surfaces of the plurality of circumferentially divided bodies respectively face the outer circumferential surface of the positioning insertion portion fixed to the antenna base; and a holding step of causing the holding part of the base to hold the holding part.

With the above method, the plurality of circumferentially divided bodies can be easily positioned using the flat surface of the antenna base and the positioning insertion part as a reference. In addition, by performing the holding process with the antenna base placed on the mounting surface so that the flat surface of the antenna base is in surface contact with the mounting surface, multiple circumferentially divided bodies can be held in a stable state. It can be held on the antenna base.
Therefore, it is possible to easily assemble a parabolic antenna device that does not have a center dividing body.

In the method for manufacturing a parabolic antenna device, in the holding step, a step is not generated in the reflecting surface between the circumferentially adjacent divided bodies, and the circumferentially adjacent divided bodies are A plurality of circumferentially divided bodies are held in a holding part of the antenna base so that there is no step between the edges of the inner peripheral surface of the through hole and the reflective surface, and a contact that contacts the edges all around the circumference. After the holding step and the jig preparation step, the positioning jig is inserted into the through hole from the reflective surface side to form the positioning insertion portion. by attaching the contact portion to the entire circumference of the edge and performing an axis adjustment step of aligning the axis of the positioning insertion portion with the axis of the positioning jig centered on the contact portion. Good too.

According to the above method, the axis of the positioning insertion part can be brought closer to the axis of the through hole at the edge with the reflective surface, or can be made to coincide with the axis of the through hole at the edge. That is, the axis of the positioning insertion portion, which is set as the axis of the through hole (the axis of the parabolic reflector), can be set with higher accuracy. Thereby, the axis of the parabolic reflector can be set with higher precision.

According to the present invention, it is possible to easily assemble a parabolic antenna device that does not have a central dividing body.

FIG. 1 is a side view showing a parabolic antenna device according to an embodiment of the present invention. FIG. 2 is a perspective view of the parabolic reflecting mirror of FIG. 1 viewed from the reflecting surface side. FIG. 2 is a perspective view of the parabolic reflecting mirror of FIG. 1 viewed from its outer surface side. FIG. 4 is a perspective view showing one circumferentially divided body constituting the parabolic reflecting mirror of FIGS. 2 and 3. FIG. 4 is a diagram showing an enlarged view of region V in FIG. 3. FIG. FIG. 4 is a perspective view showing the antenna base and positioning insert attached to the parabolic reflector of FIGS. 2 and 3. FIG. FIG. 7 is a sectional view showing the base body and positioning insert of the antenna base of FIG. 6; FIG. 8 is a sectional view showing a state in which the antenna base and positioning insertion portion of FIGS. 6 and 7 are attached to a parabolic reflector. FIG. 3 is a view of the positioning insertion portion inserted into the through hole of the parabolic reflecting mirror, as seen from the reflective surface side of the parabolic reflecting mirror. FIG. 3 is a cross-sectional view showing the relationship between two adjacent circumferentially divided bodies and a holding portion of the antenna base. FIG. 3 is a cross-sectional view showing the relationship between two adjacent circumferentially divided bodies and a holding portion of the antenna base. FIG. 3 is a cross-sectional view for explaining an axis line adjustment step in a method for manufacturing a parabolic antenna device according to an embodiment of the present invention. 13 is a perspective view showing the positioning jig of FIG. 12. FIG. FIG. 7 is a perspective view showing a state before the positioning jig is attached to the parabolic reflector and the positioning insertion part in the axis line adjustment process.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 14. In this embodiment, the words "match" and "substantially match" appear, but "match" and "substantially match" are not limited to perfect match, and include, for example, slight deviation.
As shown in FIGS. 1 to 3, the parabolic antenna device 1 according to the present embodiment includes a parabolic reflector 2, an antenna base 3, and a positioning insertion section 4. Moreover, the parabolic antenna device 1 further includes a radiator 5 and a plurality of stays 6.

The parabolic reflecting mirror 2 is formed into a bowl shape. The parabolic reflecting mirror 2 is formed into a circular shape when viewed in plan from its axial direction (X-axis direction).
The inner surface 11 of the parabolic reflecting mirror 2 includes a concave reflecting surface 12 . The reflective surface 12 reflects the electromagnetic waves emitted from the radiator 5. In this embodiment, the inner surface 11 of the parabolic reflecting mirror 2 is composed of only a reflecting surface 12. That is, the parabolic reflecting mirror 2 of this embodiment is a "rimless" reflecting mirror. Note that the inner surface 11 of the parabolic reflecting mirror 2 may further include a flat edge surface that is formed, for example, at the periphery of the reflecting surface 12 and faces in the same direction as the reflecting surface 12 in the axial direction of the parabolic reflecting mirror 2. That is, the parabolic reflecting mirror 2 may be a "rimmed" reflecting mirror, for example.

As shown in FIGS. 2 and 8, a through hole 14 is formed in the center of the reflecting surface 12 of the parabolic reflecting mirror 2. As shown in FIGS. The through hole 14 passes through the parabolic reflecting mirror 2 from the reflecting surface 12 side to the outer surface 13 side. The center of the reflecting surface 12 is the center of the circular parabolic reflecting mirror 2 when viewed from the axial direction. The inner circumferential surface 15 of the through hole 14 is formed into a circular shape when viewed from the axial direction (see FIG. 9). In this embodiment, the axis A1 of the through hole 14 may be regarded as the axis A1 of the parabolic reflector 2.

As shown in FIGS. 2 and 3, the parabolic reflecting mirror 2 includes a plurality of (four in the illustrated example) circumferentially divided bodies 20 arranged in the circumferential direction. The circumferentially divided body 20 is formed into a fan shape when viewed from the axial direction of the parabolic reflecting mirror 2. As shown in FIGS. 8 and 9, each circumferentially divided body 20 has an inner edge surface 201 that constitutes a part of the inner circumferential surface 15 of the through hole 14 of the parabolic reflector 2 in the circumferential direction. In this embodiment, when there is no step difference between the inner edge surfaces 201 of adjacent circumferentially divided bodies 20, the through hole 14 of the parabolic reflecting mirror 2 has a circular shape when viewed from the axial direction. The material constituting the circumferentially divided body 20 may be, for example, carbon fiber reinforced plastic (CFRP).

In the parabolic reflecting mirror 2 of this embodiment, when a plurality of circumferentially divided bodies 20 are combined so that no step difference occurs in the reflective surfaces 12 of adjacent circumferentially divided bodies 20, manufacturing errors of the plurality of circumferentially divided bodies 20 occur. Due to such reasons, a step may occur between the inner edge surfaces 201 of adjacent circumferentially divided bodies 20 (see FIG. 9). The maximum value of the level difference that can occur between the inner edge surfaces 201 of adjacent circumferentially divided bodies 20 may be, for example, 0.1 mm or more and 1 mm or less.

As shown in FIGS. 3 and 4, each circumferential division body 20 of this embodiment has a curved plate portion 21, a connection rib 22, an outer edge rib 23, and an inner edge rib 24.
The curved plate portion 21 constitutes part of the inner surface 11 and outer surface 13 of the parabolic reflecting mirror 2 in the circumferential direction, and is formed in a fan shape. The connection ribs 22 protrude from both edges of the curved plate portion 21 in the circumferential direction toward the outer surface 13 of the curved plate portion 21 and extend in the radial direction of the curved plate portion 21 along the outer surface 13 of the curved plate portion 21. There is. The connecting ribs 22 are provided to connect circumferentially adjacent circumferentially divided bodies 20 to each other by screwing or the like. These two circumferentially divided bodies 20 are connected to each other by overlapping the connecting ribs 22 of two circumferentially adjacent circumferentially divided bodies 20 and fixing them with screws or the like.

The outer edge rib 23 protrudes from the outer edge of the curved plate part 21 in the radial direction toward the outer surface 13 of the curved plate part 21 and extends in the circumferential direction of the curved plate part 21 along the outer surface 13 of the curved plate part 21. . The inner edge rib 24 protrudes from the inner edge of the curved plate portion 21 in the radial direction toward the outer surface 13 of the curved plate portion 21 and extends in the circumferential direction of the curved plate portion 21 along the outer surface 13 of the curved plate portion 21. . As shown in FIGS. 4, 8, and 9, the inner edge rib 24 constitutes the inner edge surface 201 of the circumferentially divided body 20 described above. Since each circumferential division body 20 has the inner edge rib 24 in this way, the length of the through hole 14 of the parabolic reflector 2 in the axial direction can be made long.
The above-described connection ribs 22, outer edge ribs 23, and inner edge ribs 24 serve to improve the rigidity of the curved plate portion 21.

As shown in FIG. 1, the radiator 5 emits electromagnetic waves toward the reflective surface 12 of the parabolic reflector 2. The radiator 5 is arranged at intervals with respect to the reflecting surface 12 in the axial direction of the parabolic reflecting mirror 2 by a plurality of stays 6, which will be described later. Specifically, the radiator 5 is located on the axis A1 of the parabolic reflector 2 passing through the center of the reflecting surface 12.

Each stay 6 is arranged on the inner surface 11 side of the parabolic reflecting mirror 2 and extends inside the parabolic reflecting mirror 2 in the radial direction from the periphery of the parabolic reflecting mirror 2. Specifically, each stay 6 extends away from the parabolic reflecting mirror 2 in the axial direction from the periphery of the parabolic reflecting mirror 2 toward the inside of the parabolic reflecting mirror 2. The plurality of stays 6 are arranged at intervals in the circumferential direction of the parabolic reflecting mirror 2. The plurality of stays 6 are coupled to each other at their distal end portions 6A in the extending direction. The plurality of stays 6 support the radiator 5 at their distal end portions 6A in the extending direction. Specifically, the radiator 5 is fixed to the tip portions 6A of the plurality of stays 6.

As shown in FIGS. 3, 5, and 8, the antenna base 3 is arranged on the outer surface 13 side of the parabolic reflector 2. The antenna base 3 has a flat surface 31 that is perpendicular to the axial direction of the through hole 14 of the parabolic reflector 2 . The antenna base 3 includes a base body 33 including a flat surface 31 and a holding part 34 that is fixed to the base body 33 and holds the plurality of circumferentially divided bodies 20.
As shown in FIGS. 5 and 6, the base body 33 of this embodiment is formed into a flat plate shape. One surface of the base body 33 facing in the thickness direction of the base body 33 is a flat surface 31.

The holding portion 34 of this embodiment holds two circumferentially adjacent divided bodies 20 in the circumferential direction. A plurality of holding parts 34 (four in FIG. 6) are fixed to the other surface 32 of the base body 33 facing opposite to the flat surface 31. Each holding portion 34 has a pair of plate portions 35 spaced apart from each other. As shown in FIGS. 5 and 10, the pair of plate portions 35 sandwich the connecting ribs 22 of the two circumferentially divided bodies 20 that overlap in the circumferential direction. Specifically, by using the fastening bolt 38 inserted through the pair of plate parts 35 and the two connection ribs 22 sandwiched between them, the two connection ribs 22 are connected to the pair of plate parts 35. caught in between. Thereby, the two circumferentially divided bodies 20 are held by the holding portion 34.
As shown in FIG. 8, the plurality of circumferentially divided bodies 20 held by the holding part 34 are located on the other surface 32 side of the base main body 33. Furthermore, the plurality of circumferentially divided bodies 20 are held by the holding portion 34 with a space provided between them with respect to the other surface 32 of the base main body 33 .

As shown in FIG. 10, the diameter of the insertion hole 28 of the connection rib 22 through which the fastening bolt 38 passes is larger than the diameter of the fastening bolt 38. Therefore, when the two circumferentially divided bodies 20 are held in the circumferential direction by the holding part 34, the direction perpendicular to the direction in which the two connecting ribs 22 are arranged (i.e., the radial direction or the axial direction of the parabolic reflector 2) In addition, the two circumferential division bodies 20 can be relatively moved within a predetermined range. Thereby, when the holding portion 34 holds the two circumferentially divided bodies 20 aligned in the circumferential direction, the relative positions of the two circumferentially divided bodies 20 can be adjusted. Therefore, the level difference that occurs on the reflecting surface 12 of the parabolic reflector 2 or the inner circumferential surface 15 of the through hole 14 between two circumferentially adjacent circumferentially divided bodies 20 is reduced or eliminated. , the relative positions of the two circumferential division bodies 20 can be adjusted.
As described above, since the circumferentially divided body 20 is held by the holding part 34 with a space between it and the base body 33, the relative positions of the two circumferentially divided bodies 20 described above can be easily adjusted. It can be carried out.

As shown in FIG. 11, positioning holes 36 and 26 are formed in the pair of plate parts 35 of the holding part 34 and in the connection ribs 22 of the two circumferentially adjacent circumferentially divided bodies 20, respectively. ing. The diameters of the positioning holes 36 of the pair of plate parts 35 and the positioning holes 26 of the two connecting ribs 22 are equal to each other. The parabolic antenna device 1 of this embodiment includes a positioning pin 7 inserted into the positioning holes 36 and 26 of both of the pair of plate parts 35 and the two connection ribs 22. The diameter of the positioning pin 7 is equivalent to the diameter of the positioning holes 26 and 36 described above. In FIG. 11, the positioning pin 7 is constituted by a bolt, but the present invention is not limited to this. A plurality of the positioning pins 7 may be inserted into the same pair of plate parts 35 and the two connection ribs 22.

When the positioning pin 7 is inserted into the positioning holes 26, 36 of the pair of plate parts 35 and the connecting ribs 22, the two circumferentially divided bodies 20 including the two connecting ribs 22 are aligned in the arrangement direction. It is possible to suppress or prevent relative movement in a direction perpendicular to (that is, a radial direction or an axial direction of the parabolic reflecting mirror 2). That is, the two circumferentially adjacent divided bodies 20 can be relatively positioned.

As shown in FIGS. 6 to 8, the positioning insertion portion 4 is fixed to the antenna base 3 and is formed into a columnar shape extending in a direction (X-axis direction) perpendicular to the flat surface 31 of the antenna base 3. The positioning insertion part 4 is inserted into the through hole 14 of the parabolic reflector 2. The positioning insertion portion 4 inserted into the through hole 14 does not protrude toward the reflecting surface 12 of the parabolic reflecting mirror 2. The positioning insertion portion 4 has an outer peripheral surface 41 that faces the inner peripheral surface 15 of the through hole 14 when inserted into the through hole 14 . The shape of the positioning insertion portion 4 seen from the axial direction corresponds to the shape of the through hole 14 seen from the axial direction. In this embodiment, the positioning insertion part 4 is formed into a circular shape when viewed from the axial direction (see FIGS. 6 and 9).

As shown in FIG. 9, the positioning insertion portion 4 of this embodiment is configured such that its outer circumferential surface 41 contacts at least two inner edge surfaces 201 of the plurality of circumferentially divided bodies 20 arranged in the circumferential direction. is formed. The outer circumferential surface 41 of the positioning insertion part 4 may contact three or more inner edge surfaces 201 or may contact all of the inner edge surfaces 201. In FIG. 9, the outer circumferential surface 41 of the positioning insertion portion 4 is in contact with two inner edge surfaces 201 that are not adjacent to each other in the circumferential direction, but it may be in contact with two inner edge surfaces 201 that are adjacent to each other in the circumferential direction, for example.

Further, the diameter dimension of the positioning insertion part 4 when viewed from the axial direction is set so that a gap is created between the outer peripheral surface 41 of the positioning insertion part 4 inserted into the through hole 14 and the inner peripheral surface 15 of the through hole 14. be done. The size of the gap formed between the outer circumferential surface 41 of the positioning insertion part 4 and the inner circumferential surface 15 of the through hole 14 is determined by the size of the gap formed on the inner circumferential surface 15 of the through hole 14 in the circumferential direction (for example, from 0.1 mm to 1mm). Thereby, even if there is a step on the inner circumferential surface 15 of the through hole 14, the positioning insertion portion 4 can be inserted into the through hole 14.

If there is a gap between the outer peripheral surface 41 of the positioning insertion part 4 and the inner peripheral surface 15 of the through hole 14 when the positioning insertion part 4 is inserted into the through hole 14, the axis A2 of the positioning insertion part 4 and the through hole 14 axes A1 may be tilted with respect to each other. On the other hand, by setting the lengths of the through hole 14 and the positioning insertion part 4 in the axial direction to be long, the angle of inclination between the axis A2 of the positioning insertion part 4 and the axis A1 of the through hole 14 can be kept small. The lengths of the through hole 14 and the positioning insertion portion 4 are preferably set so that the inclination angle is within 1 degree, for example.

As shown in FIG. 7, the positioning insertion portion 4 of this embodiment has a flange portion 42 that protrudes from the outer circumferential surface 41 at one end (base end) in the axial direction. The positioning insertion portion 4 is inserted into the base body 33 from the flat surface 31 side (one side), and is positioned with respect to the base body 33 by the flange portion 42 coming into contact with the flat surface 31. Further, the positioning insertion portion 4 is fixed to the base body 33 by screwing the flange portion 42 to the base body 33. Note that the positioning insertion portion 4 may be positioned with respect to the base body 33 by being inserted into the base body 33 from the other surface 32 side of the base body 33, for example. Moreover, the method of fixing the positioning insertion part 4 to the base body 33 may be arbitrary.

Further, the positioning insertion portion 4 of this embodiment is formed with an insertion hole 43 that is recessed in the axial direction from the distal end of the positioning insertion portion 4 extending from the base body 33. The insertion hole 43 is formed for attaching a positioning jig 100 (see FIGS. 12 to 14) to the positioning insertion portion 4 in a method for manufacturing the parabolic antenna device 1, which will be described later. Although the insertion hole 43 in the illustrated example passes through the positioning insertion portion 4 in its axial direction, it may not, for example, penetrate through the positioning insertion portion 4 .

Next, an example of a method for manufacturing the parabolic antenna device 1 according to this embodiment will be described.
When manufacturing the parabolic antenna of this embodiment shown in FIGS. 1 to 11, a reflector assembly process is performed in advance to assemble the parabolic reflector 2 by connecting a plurality of circumferentially divided bodies 20. In the reflecting mirror assembly process, the two connecting ribs 22 of the two circumferentially adjacent circumferentially divided bodies 20 are screwed together so as to hold the connecting ribs 22 in an overlapping state. The assembly of the parabolic reflecting mirror 2 at this stage is a temporary assembly in which the adjacent circumferentially divided bodies 20 can be moved slightly relative to each other. Further, as shown in FIGS. 6 and 7, the antenna base 3 is assembled by attaching the holding part 34 to the base body 33 in advance, and an antenna base assembly process is carried out in which the positioning insertion part 4 is attached to the antenna base 3. The order of the reflector assembly process and the antenna base assembly process is not particularly limited.

Next, as shown in FIGS. 6 and 12, a mounting step is performed in which the antenna base 3 is mounted on a flat mounting surface G (for example, the ground or floor). In the mounting process, the flat surface 31 of the antenna base 3 is brought into surface contact with the mounting surface G. Thereby, the antenna base 3 and the positioning insertion section 4 can be stably arranged. In a state where the antenna base 3 is placed on the placement surface G, the positioning insertion portion 4 extends upward from the placement surface G. Further, the axis A2 of the positioning insertion portion 4 is perpendicular or approximately perpendicular to the mounting surface G.

After the mounting step, a holding step is performed in which the plurality of circumferentially divided bodies 20 are held by the holding portion 34 of the antenna base 3. In the holding step, the inner edge surfaces 201 of the plurality of circumferentially divided bodies 20 are respectively opposed to the outer circumferential surface 41 of the positioning insertion part 4 fixed to the antenna base 3.
In this embodiment, the parabolic reflecting mirror 2 is assembled by connecting a plurality of circumferentially divided bodies 20 before the holding step. Therefore, in the holding step, by inserting the positioning insertion part 4 into the through hole 14 from the outer surface 13 side of the parabolic reflector 2, the inner edge surfaces 201 of the plurality of circumferentially divided bodies 20 are fixed to the antenna base 3. It faces the outer circumferential surface 41 of the positioning insertion section 4 that has been positioned.

In the holding process of this embodiment, as shown in FIG. 10, the fastening bolts 38 are used to connect the two circumferentially divided bodies 20 that overlap in the circumferential direction between the pair of plate parts 35 of the holding part 34. sandwiching the ribs 22. Here, the diameter of the insertion hole 28 of the connection rib 22 through which the fastening bolt 38 passes is larger than the diameter of the fastening bolt 38. Therefore, when the two connecting ribs 22 are sandwiched between the pair of plate parts 35, the two circumferentially divided bodies 20 can be moved within a predetermined range in a direction perpendicular to the direction in which the two connecting ribs 22 are lined up. (that is, the radial direction and axial direction of the parabolic reflecting mirror 2).

In the holding process, after the two connecting ribs 22 are sandwiched between the pair of plate parts 35, a step is created on the reflective surface 12 of the parabolic reflector 2 between the two circumferentially adjacent divided bodies 20. The relative positions of the two circumferentially divided bodies 20 are adjusted so that the two circumferentially divided bodies 20 are held. In addition, the two circumferentially divided bodies 20 are arranged so that there is no step between the inner circumferential surface 15 of the through hole 14 and the edge 17 (see FIG. 14) of the reflective surface 12 between the two circumferentially divided bodies 20. These two circumferentially divided bodies 20 are held by adjusting their relative positions. In the position adjustment of the two circumferentially divided bodies 20 described above, there is a step difference in the inner circumferential surface 15 of the through hole 14 at a portion of the inner circumferential surface 15 of the through hole 14 that is remote from the reflective surface 12 in the axial direction of the through hole 14. may be allowed to occur.

In the state after the above-described holding step, the inner edge surfaces 201 of all the circumferentially divided bodies 20 may contact the outer circumferential surface 41 of the positioning insertion part 4, or the inner edge surfaces 201 of some of the circumferentially divided bodies 20 may contact the outer circumferential surface 41 of the positioning insertion part 4. Only the outer circumferential surface 41 of the positioning insertion portion 4 may be contacted. Moreover, the inner edge surfaces 201 of all the circumferential division bodies 20 do not need to be in contact with the outer circumferential surface 41 of the insertion portion.

In the manufacturing method of this embodiment, a jig preparation step of preparing the positioning jig 100 shown in FIGS. 12 to 14 is further performed. The positioning jig 100 has a contact portion 101 that contacts an edge 17 between the inner circumferential surface 15 of the through hole 14 and the reflective surface 12 over the entire circumference. Further, the positioning jig 100 has an insertion protrusion 102 that is inserted into the insertion hole 43 of the positioning insertion part 4. In the positioning jig 100, the axes A3 of the contact portion 101 and the insertion protrusion 102 are aligned. In the following description, the axis A3 of the contact portion 101 and the insertion protrusion 102 is assumed to be the axis A3 of the positioning jig 100.

The size and shape of the insertion protrusion 102 when viewed from the axial direction correspond to the insertion hole 43 of the positioning insertion part 4. Therefore, when the insertion projection 102 is inserted into the insertion hole 43 of the positioning insertion section 4, the axis A3 of the positioning jig 100 substantially coincides with the axis A2 of the positioning insertion section 4.
The relative order of the jig preparation process and each process such as the above-mentioned mounting process and holding process does not particularly matter.

After the jig preparation process described above and the holding process described above, an axis line adjustment process is performed. In the axis adjustment step, as shown in FIGS. 12 and 14, the positioning jig 100 is inserted into the through hole 14 from the reflective surface 12 side of the parabolic reflector 2 and attached to the positioning insertion part 4. Then, the contact portion 101 of the positioning jig 100 is brought into contact with the entire circumference of the edge 17. Further, the insertion protrusion 102 of the positioning jig 100 is inserted into the insertion hole 43 of the positioning insertion part 4. Thereby, the axis A2 of the positioning insertion portion 4 substantially coincides with the axis A3 of the positioning jig 100.

In the axis adjustment process, the contact portion 101 of the positioning jig 100 contacts the entire circumference of the edge 17, so that the axis A3 of the positioning jig 100 and the axis A1 of the through hole 14 in the edge 17 can be made to coincide. Further, by inserting the insertion protrusion 102 of the positioning jig 100 into the insertion hole 43 of the positioning insertion part 4, the axis A2 of the positioning insertion part 4 can be made to coincide with the axis A3 of the positioning jig 100. Thereby, the axis A2 of the positioning insertion part 4 can be made to coincide with the axis A1 of the through hole 14 (that is, the axis A1 of the parabolic reflector 2).

In the state after the above-described axis line adjustment step, the relative positioning of the parabolic reflector 2, antenna base 3, and positioning insertion portion 4 has been completed. Therefore, after the axis line adjustment process, as shown in FIG. A pin insertion step of inserting the positioning pin 7 into 26 and 36 may be performed. Thereby, the relative positions of the parabolic reflector 2, the antenna base 3, and the positioning insertion section 4 can be maintained. In the pin insertion process, positioning holes 26 and 36 may be newly formed in the pair of plate portions 35 and the connection rib 22, and then the positioning pin 7 may be inserted into these positioning holes 26 and 36.
After the pin insertion process, the positioning jig 100 used in the axis adjustment process may be removed.

Finally, the method for manufacturing the parabolic antenna device 1 is completed by carrying out the radiator mounting step of attaching the plurality of stays 6 and the radiator 5 shown in FIG. 1 to the parabolic reflector 2. In the radiator mounting process, the radiator 5 may be positioned on the axis A1 of the parabolic reflector 2 by using the positioning insertion part 4 inserted into the through hole 14 of the parabolic reflector 2. Further, for positioning the radiator 5, for example, a "radiator positioning jig" described in Patent Document 1 may be used.

In the method for manufacturing the parabolic antenna device 1 described above, when the axis line adjustment process is not performed (the positioning jig 100 is not used), when performing the position adjustment of the circumferentially adjacent divided bodies 20 in the circumferential direction in the holding process. Furthermore, it may be possible to allow a step to occur on the edge 17 between the two circumferentially divided bodies 20. Instead, for example, adjacent circumferential divisions may be arranged such that the outer circumferential surface 41 of the positioning insertion portion 4 contacts the inner edge surfaces 201 of two or more of the inner edge surfaces 201 of the plurality of circumferential division bodies 20 arranged in the circumferential direction. Adjustments to the position of body 20 may be made.

In the method for manufacturing the parabolic antenna device 1 described above, for example, the parabolic reflecting mirror 2 is assembled by holding the plurality of circumferentially divided bodies 20 in the holding part 34 in the holding process without performing the reflecting mirror assembly process. It's okay to be hit.

The parabolic antenna device 1 of this embodiment manufactured as described above is, for example, a weather radar or the like, and may further include a rotary table 9 to which a parabolic reflector 2 is attached, as illustrated in FIG. The rotary table 9 has a parabolic reflecting mirror centered on a vertical axis A4 extending in the vertical direction (an axis extending in the vertical direction in FIG. 1) and a horizontal axis A5 extending in the horizontal direction (an axis extending in a direction perpendicular to the plane of the paper in FIG. 1). Rotate 2. Thereby, the parabolic reflecting mirror 2 can be directed in various directions by the rotary table 9.
The parabolic antenna device 1 of this embodiment is attached to the rotary table 9 with the flat surface 31 of the antenna base 3 facing toward the rotary table 9 as a reference.

As described above, the parabolic antenna device 1 of the present embodiment has a parabolic reflecting mirror 2 that is formed in a bowl shape and has a concave reflecting surface 12 and a through hole 14 formed in the center of the reflecting surface 12. and an antenna base 3 which is arranged on the outer surface 13 side of the parabolic reflector 2 and has a flat surface 31 orthogonal to the axial direction of the through hole 14; A positioning insertion part 4 formed in an extending column shape and inserted into a through hole 14 is provided. The parabolic reflecting mirror 2 includes a plurality of circumferentially divided bodies 20 arranged in the circumferential direction thereof and each having an inner edge surface 201 that constitutes a part of the inner circumferential surface 15 of the through hole 14 in the circumferential direction. The positioning insertion portion 4 has an outer circumferential surface 41 that faces the inner circumferential surface 15 when inserted into the through hole 14 . The antenna base 3 has a holding part 34 that holds the plurality of circumferentially divided bodies 20.

Thereby, the plurality of circumferentially divided bodies 20 can be positioned using the flat surface 31 of the antenna base 3 and the positioning insertion portion 4 as a reference. Specifically, by holding the circumferentially dividing body 20 in the holding portion 34 of the antenna base 3 with the inner edge surface 201 of each circumferentially dividing body 20 facing the outer circumferential surface 41 of the positioning insertion portion 4, The plurality of circumferential division bodies 20 can be easily positioned. Therefore, it is possible to easily assemble the parabolic antenna device 1 that does not have a center dividing body.

Furthermore, in the parabolic antenna device 1 of this embodiment, the outer circumferential surface 41 of the positioning insertion portion 4 contacts at least two inner edge surfaces 201 of the plurality of circumferentially divided bodies 20 arranged in the circumferential direction. Therefore, even if the axis A1 of the through hole 14 of the parabolic reflector 2 is not clear due to a step between the inner edge surfaces 201 adjacent to each other in the circumferential direction, the positioning insertion portion inserted into the through hole 14 4 can be set as the axis A1 of the through hole 14 (that is, the axis A1 of the parabolic reflector 2). Thereby, the axis A1 of the parabolic reflecting mirror 2 can be made clear.

By making the axis A1 of the parabolic reflector 2 clear, it becomes possible to accurately position the radiator 5 on the axis A1 of the parabolic reflector 2 using the positioning insertion part 4.
Also, by making the axis A1 of the parabolic reflector 2 clear, when attaching the parabolic reflector 2 to the rotating table 9 using the flat surface 31 of the antenna base 3, the axis A1 of the parabolic reflecting mirror 2 and the rotating table 9 (vertical axis A4, horizontal axis A5) can be reliably intersected. That is, it is possible to prevent the axis A1 of the parabolic reflecting mirror 2 from shifting with respect to the rotation axis of the rotary table 9. Thereby, it is possible to accurately grasp the orientation of the parabolic reflecting mirror 2 when the rotating table 9 rotates the parabolic reflecting mirror 2.

Furthermore, in the parabolic antenna device 1 of this embodiment, the positioning holes 36 and 26 are formed in the holding part 34 and the circumferentially divided body 20, and the positioning holes 36 and 26 in both the holding part 34 and the circumferentially divided body 20 are formed in the holding part 34 and the circumferentially divided body 20. The positioning pin 7 is inserted. As a result, even after the parabolic reflector 2 is disassembled into a plurality of circumferentially divided bodies 20, the same positioning pin 7 can be passed through the positioning holes 26, 36 of both the holding part 34 and the circumferentially divided body 20. Therefore, the parabolic reflecting mirror 2 can be easily assembled without relative positioning of the circumferentially adjacent divided bodies 20.

In addition, in the method for manufacturing the parabolic antenna device 1 of the present embodiment, the antenna base 3 is placed on the mounting surface G so that the flat surface 31 of the antenna base 3 is in surface contact with the mounting surface G, and a plurality of The circumferentially divided body 20 is held by the holding portion 34. Thereby, the plurality of circumferentially divided bodies 20 can be stably held on the antenna base 3. In the holding step, the antenna base 3 is placed as described above, and the inner edge surfaces 201 of the plurality of circumferentially divided bodies 20 are respectively attached to the outer circumferential surface 41 of the positioning insertion part 4 fixed to the antenna base 3. The plurality of circumferentially divided bodies 20 are held by the holding part 34 of the antenna base 3 so as to face each other. Thereby, the plurality of circumferentially divided bodies 20 can be easily positioned using the flat surface 31 of the antenna base 3 and the positioning insertion portion 4 as a reference. Therefore, the parabolic antenna device 1 can be easily assembled.

In addition, in the method for manufacturing the parabolic antenna device 1 of the present embodiment, in the holding step, a step is not generated in the reflecting surface 12 between the circumferentially adjacent divided bodies 20, and The plurality of circumferentially divided bodies 20 are held in the holding portion 34 of the antenna base 3 so that no step is formed between the circumferentially divided bodies 20 on the edge 17 between the inner circumferential surface 15 of the through hole 14 and the reflective surface 12. . Furthermore, in the axis line adjustment process after the holding process, the positioning jig 100 is inserted into the through hole 14 from the reflective surface 12 side and attached to the positioning insertion part 4, and the contact part 101 of the positioning jig 100 is attached to the entire circumference of the edge 17. At the same time, the axis A2 of the positioning insertion part 4 is made to coincide with the axis A3 of the positioning jig 100 centered on the contact part 101.
Therefore, in the axis adjustment step, the axis A2 of the positioning insertion portion 4 can be brought closer to the axis A1 of the through hole 14 at the edge 17, or can be made to coincide with the axis A1 of the through hole 14 at the edge 17. That is, the axis A2 of the positioning insertion portion 4, which is set as the axis A1 of the through hole 14 (the axis A1 of the parabolic reflector 2), can be set with higher precision. Thereby, the axis A1 of the parabolic reflector 2 can be set with higher accuracy.

Although the details of the present invention have been described above, the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention.

1 Parabolic antenna device 2 Parabolic reflector 3 Antenna base 4 Positioning insertion part 7 Positioning pin 12 Reflection surface 13 Outer surface 14 Through hole 15 Inner peripheral surface 20 Circumferential division body 201 Inner edge surface 26 Positioning hole 31 Flat surface 34 Holding part 36 Positioning hole 41 Outer peripheral surface 100 Positioning jig 101 Contact part G Placement surface

Claims (5)

a parabolic reflecting mirror that is formed in a bowl shape and has a concave reflecting surface, and a through hole is formed in the center of the reflecting surface;
an antenna base disposed on the outer surface side of the parabolic reflector and having a flat surface perpendicular to the axial direction of the through hole;
a positioning insertion part fixed to the antenna base, formed in a column shape extending in a direction perpendicular to the flat surface, and inserted into the through hole,
The parabolic reflecting mirror is arranged in a circumferential direction of the parabolic reflecting mirror and includes a plurality of circumferentially divided bodies each having an inner edge surface that constitutes a part of the inner circumferential surface of the through hole in the circumferential direction,
The positioning insertion part has an outer circumferential surface that faces the inner circumferential surface when inserted into the through hole,
The antenna base is a parabolic antenna device including a holding part that holds the plurality of circumferentially divided bodies. The parabolic antenna device according to claim 1, wherein an outer circumferential surface of the positioning insertion portion is in contact with at least two inner edge surfaces of the plurality of circumferentially divided bodies arranged in the circumferential direction. A positioning hole is formed in the holding part and the circumferentially divided body held by the holding part,
The parabolic antenna device according to claim 1 or 2, further comprising a positioning pin inserted into the positioning hole of both the holding part and the circumferentially divided body. A method for manufacturing a parabolic antenna device for manufacturing the parabolic antenna device according to claim 1 or 2, comprising:
a mounting step of mounting the antenna base on the mounting surface so that the flat surface is in surface contact with the flat mounting surface;
Holding the plurality of circumferentially divided bodies by the holding part of the antenna base such that the inner edge surfaces of the plurality of circumferentially divided bodies respectively face the outer peripheral surface of the positioning insertion part fixed to the antenna base. A method for manufacturing a parabolic antenna device, comprising the steps of: In the holding step, the inner periphery of the through hole is maintained between the circumferentially adjacent divided bodies so that no level difference occurs in the reflective surface between the circumferentially adjacent divided bodies. Holding the plurality of circumferentially divided bodies in a holding part of the antenna base so that there is no step difference between the edge of the surface and the reflecting surface,
Performing a jig preparation step of preparing a positioning jig having a contact part that contacts the edge all around the circumference,
After the holding step and the jig preparation step, the positioning jig is inserted into the through hole from the reflective surface side and attached to the positioning insertion part, so that the contact part is brought into contact with the entire circumference of the edge. 5. The method for manufacturing a parabolic antenna device according to claim 4, further comprising performing an axis adjustment step of aligning the axis of the positioning insertion portion with the axis of the positioning jig centered on the contact portion.

Images