JP7074487B2 - Parabolic antenna device - Google Patents

Description

The present invention relates to a parabolic antenna device.

Parabolic antenna devices are used in weather radar, satellite communications, radio telescopes, and so on. Some parabolic antenna devices include a bowl-shaped parabolic reflector and a radiator that radiates electromagnetic waves toward the inner surface of the parabolic reflector (see, for example, Patent Document 1). Further, some parabolic antenna devices support a radiator at the tips of a plurality of stays extending radially inward from the peripheral edge of the parabolic reflector.
Conventionally, in this type of parabolic antenna device, a plurality of stays are attached to a frame (reinforcing frame) provided on the outer surface side (back side) of the parabolic reflector to reinforce the strength of the parabolic reflector. The mounting accuracy of the reinforcing frame to the parabolic reflector is low. Therefore, in the conventional parabolic antenna device, the radiator is positioned with respect to the parabolic reflector by adjusting the length of each stay from the peripheral edge of the parabolic reflector to the radiator with an adjusting screw.

Japanese Unexamined Patent Publication No. 2016-146589

However, in the above-mentioned conventional parabolic antenna device, since it is necessary to position the radiator with the adjusting screw, there is a problem that the manufacture of the parabolic antenna device (particularly the assembly work) is troublesome.
Further, if the stay arranged on the inner surface side of the parabolic reflector bends when the radiator is positioned by the adjusting screw, there is a problem that the radio wave characteristics of the parabolic antenna device change.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a parabolic antenna device that can be easily manufactured and can suppress changes in radio wave characteristics based on stays.

The parabolic antenna device according to one aspect of the present invention includes a bowl-shaped parabolic reflector, a radiator that emits electromagnetic waves toward the inner surface of the parabolic reflector, and the parabolic reflector in the radial direction from the peripheral edge of the parabolic reflector. A plurality of stays extending inward of the parabolic reflector and supporting the radiator at the tip in the extension direction are provided, and the base end in the extension direction of each stay located on the peripheral edge side of the parabolic reflector is the extension direction. It is attached to a base portion fixed to the outer surface side of the parabolic reflector in a state of being abutted against the outer peripheral surface of the parabolic reflector, and the base portion is positioned with respect to the boundary line between the inner surface and the outer peripheral surface. It is characterized by that.

In the parabolic antenna device having the above configuration, each base portion is fixed to the parabolic reflector with the outer peripheral surface (periphery) of the parabolic reflector as a reference, and the base end portion of each stay is attached to each base portion. As a result, each stay can be extended inside the parabolic reflector in the radial direction with reference to the peripheral edge of the parabolic reflector having high dimensional accuracy. Therefore, the radiator provided at the tip of the plurality of stays can be easily positioned with high accuracy with respect to the parabolic reflector only by improving the dimensional accuracy in the extension direction of each stay. Therefore, the parabolic antenna device can be easily manufactured.
Further, when manufacturing the parabolic antenna device, it is not necessary to adjust the length of each stay with the adjusting screw as in the conventional case, so that it is possible to suppress the occurrence of bending in each stay. Therefore, it is possible to suppress changes in the radio wave characteristics of the parabolic antenna device based on the stay.

Further, in the parabolic antenna device, the parabolic reflecting mirror includes a plurality of circumferential divisions arranged in the circumferential direction of the parabolic reflecting mirror, and the base portion is adjacent to the circumferential direction in the two circumferential directions. It may be abutted against the outer peripheral surface of the split body and may be positioned with respect to the boundary line of one of the circumferential split bodies.

Further, in the parabolic antenna device, the parabolic reflecting mirror has a bowl-shaped plate portion forming the inner surface and the outer surface, and an outer surface of the bowl-shaped plate portion in the axial direction of the parabolic reflecting mirror from the peripheral edge of the bowl-shaped plate portion. An annular rib extending to the side to form the outer peripheral surface and a radial rib protruding from the outer surface of the bowl-shaped plate portion and extending radially inward from the inner peripheral surface of the annular rib portion are provided. The base portion may be abutted against a portion of the annular rib to which the radial rib is connected.

Further, in the parabolic antenna device, the parabolic reflecting mirror forms the inner surface and the outer surface of the bowl-shaped plate portion, and the outer surface of the bowl-shaped plate portion in the axial direction of the parabolic reflecting mirror from the peripheral edge of the bowl-shaped plate portion. With an annular rib extending to the side to form the outer peripheral surface,
The base portion may be abutted against the base end portion of the outer peripheral surface of the annular rib in the extension direction of the annular rib.

According to the present invention, the parabolic antenna device can be easily manufactured, and changes in the radio wave characteristics of the parabolic antenna device can be suppressed.

It is a side view which shows the parabolic antenna apparatus which concerns on one Embodiment of this invention. It is a perspective view which looked at the parabolic reflector of FIG. 1 from the inner surface side. It is a perspective view which looked at the parabolic reflector of FIG. 1 from the outer surface side. It is a perspective view which shows one circumferential division body which comprises the parabolic reflector of FIGS. 2 and 3. 2 is a schematic cross-sectional view showing a connection between a central division body and a circumferential division body constituting the parabolic reflector of FIGS. 2 and 3. It is an enlarged perspective view which looked at the peripheral part of the parabolic reflector of FIGS. 1 to 3 from the outer surface side of the parabolic reflector. It is an enlarged perspective view which looked at the peripheral part of the parabolic reflector of FIGS. 1 to 3 from the inner surface side of the parabolic reflector. It is an enlarged sectional view of the peripheral part of the parabolic reflector of FIGS. 1 to 3 seen from the circumferential direction of the parabolic reflector. FIG. 3 is an enlarged cross-sectional view of the peripheral portion of the parabolic reflector of FIGS. 1 to 3 as viewed from the outer surface side of the parabolic reflector. It is an enlarged sectional view which shows the base end part of the stay attached to the parabolic reflector of FIGS. 1 to 3. It is schematic cross-sectional view which shows the relationship between the stay arranged on the inner surface side of the parabolic reflector of FIGS. 1 to 3 and a waveguide. It is an enlarged sectional view which shows the jig attachment part provided in the central part of the parabolic reflector of FIGS. 1 to 3. It is a figure which shows the state which attached the radiator positioning jig to the jig attachment part of FIG. It is a figure which shows the state which another radiator positioning jig is attached to the jig attachment part of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 13.
As shown in FIGS. 1 to 3, the parabolic antenna device 1 according to the present embodiment includes a parabolic reflector 2, a radiator 3, and a plurality of stays 4. Further, the parabolic antenna device 1 includes a waveguide 5.

The parabolic reflector 2 is formed in a bowl shape. The parabolic reflector 2 is formed in a circular shape in a plan view seen from its axial direction (X-axis direction; hereinafter, also simply referred to as axial direction).
The inner surface 11 of the parabolic reflecting mirror 2 includes a concave reflecting surface 12 which is formed in a concave shape and reflects an electromagnetic wave radiated from the radiator 3. The inner surface 11 of the parabolic reflecting mirror 2 is formed on the peripheral edge of the concave reflecting surface 12 in addition to the concave reflecting surface 12, for example, and is a flat edge surface facing in the same direction as the concave reflecting surface 12 in the axial direction of the parabolic reflecting mirror 2. May include. That is, the parabolic reflector 2 may be, for example, a “rimmed” reflector. In the present embodiment, the inner surface 11 of the parabolic reflecting mirror 2 is composed of only the concave reflecting surface 12. The concave reflecting surface 12 is directly connected to the outer peripheral surface 13 of the parabolic reflecting mirror 2 (see FIG. 8). That is, the parabolic reflector 2 of the present embodiment is a "rimless" reflector.

The outer surface 14 of the parabolic reflecting mirror 2 is a surface facing the inner surface 11 in the axial direction, and is formed in a convex shape mainly corresponding to the concave reflecting surface 12.
The outer peripheral surface 13 of the parabolic reflector 2 is a surface extending mainly from the peripheral edge of the inner surface 11 toward the outer surface 14 in the axial direction. The outer peripheral surface 13 of the present embodiment is inclined outward in the radial direction toward the outer surface 14 side in the axial direction (see FIG. 8). That is, the diameter of the outer peripheral surface 13 gradually increases from the inner surface 11 side to the outer surface 14 side in the axial direction.

As shown in FIGS. 3, 6 and 8, the parabolic reflector 2 of the present embodiment includes a bowl-shaped plate portion 21 forming an inner surface 11 and an outer surface 14, and an annular rib 22 forming an outer peripheral surface 13. The annular rib 22 extends from the peripheral edge of the bowl-shaped plate portion 21 toward the outer surface 14 side of the bowl-shaped plate portion 21 in the axial direction. The annular rib 22 is configured by forming a strip extending in the circumferential direction on the peripheral edge of the bowl-shaped plate portion 21 in an annular shape. That is, the dimension of the annular rib 22 in the axial direction is sufficiently smaller than the dimension of the parabolic reflector 2.

Further, the parabolic reflector 2 of the present embodiment includes a radial rib 23 formed on the outer surface 14 of the bowl-shaped plate portion 21. As shown in FIGS. 3, 6, 8 and 9, the radial rib 23 protrudes from the outer surface 14 of the bowl-shaped plate portion 21 and extends from the inner peripheral surface 24 of the annular rib 22 to the inside of the bowl-shaped plate portion 21 in the radial direction. It is extended. The radial rib 23 is formed on the outer surface 14 of the bowl-shaped plate portion 21 in the shape of a strip extending in the radial direction of the bowl-shaped plate portion 21. The radial rib 23 may reach the center of the outer surface 14 of the bowl-shaped plate portion 21, for example, but does not reach the center in the present embodiment. A plurality (eight in the illustrated example) of the radial ribs 23 are arranged at intervals in the circumferential direction of the bowl-shaped plate portion 21.
The bowl-shaped plate portion 21, the annular rib 22, and the radial rib 23 described above are integrally formed. The annular rib 22 and the radial rib 23 play a role of improving the rigidity of the bowl-shaped plate portion 21.

As shown in FIGS. 2 and 3, the parabolic reflector 2 of the present embodiment includes a plurality of (eight in the illustrated example) circumferential divisions 25 arranged in the circumferential direction thereof. Further, the parabolic reflector 2 of the present embodiment includes a central division body 26 forming a central region of the inner surface 11 thereof. Therefore, the plurality of circumferential divisions 25 are arranged in the circumferential direction of the parabolic reflector 2 so as to surround the central division 26, and form a peripheral region of the inner surface 11 of the parabola reflector 2.
As shown in FIGS. 3 and 5, the central division body 26 has a cylindrical flange portion 27 projecting toward the outer surface 14 side of the parabolic reflector 2. A nut component 28 for screwing the circumferential division body 25 to the central division body 26 is fixed to the inner peripheral surface of the tubular flange portion 27.

As shown in FIG. 4, connecting ribs 31 are formed at both ends of the circumferential dividing body 25 in the circumferential direction to connect the circumferential dividing bodies 25 adjacent to each other in the circumferential direction to each other by screwing or the like. The connecting rib 31 constitutes the radial rib 23 described above. An outer edge rib 32 constituting the above-mentioned annular rib 22 is formed on the outer edge of the circumferential division 25 in the radial direction. On the inner edge of the circumferentially divided body 25 in the radial direction, an inner edge rib 33 that protrudes from the outer surface 14 of the circumferentially divided body 25 and extends in the circumferential direction is formed. The inner edge rib 33 is used to fix the circumferential division body 25 to the central division body 26 as shown in FIG.

When fixing the circumferential division body 25 and the central division body 26, the screw 34 is passed through the inner edge rib 33 and the tubular flange portion 27 in order from the outer peripheral surface side of the tubular flange portion 27, and then the nut component. It may be attached to 28.
The circumferential division body 25 and the central division body 26 described above may be formed of, for example, carbon fiber reinforced plastic (CFRP) or the like.

As shown in FIGS. 1 and 3, a reinforcing frame 6 for reinforcing the parabolic reflector 2 is attached to the outer surface 14 of the parabolic reflector 2 described above. The reinforcing frame 6 includes an annular frame portion 41 and a plurality of rod-shaped frame portions 42.
The annular frame portion 41 is formed in an annular shape in a plan view, and is arranged in the middle of the outer surface 14 of the parabolic reflector 2 in the radial direction. The annular frame portion 41 is fixed to a plurality of radial ribs 23 by screwing or the like. Each rod-shaped frame portion 42 is arranged along the radial rib 23 so as to extend in the radial direction of the parabolic reflector 2. Each rod-shaped frame portion 42 is fixed to the inner edge rib 33, the radial rib 23, and the annular frame portion 41 of the circumferential division body 25.

As shown in FIGS. 1 and 2, the radiator 3 radiates an electromagnetic wave toward the concave reflecting surface 12 (inner surface 11) of the parabolic reflecting mirror 2. The radiator 3 is arranged at intervals with respect to the concave reflecting surface 12 in the axial direction of the parabolic reflecting mirror 2 by a plurality of stays 4 described later. Specifically, the radiator 3 is located on the axis A1 of the parabolic reflector 2 passing through the center of the concave reflecting surface 12.

Each stay 4 is arranged on the inner surface 11 side of the parabolic reflector 2, and extends from the peripheral edge of the parabolic reflector 2 to the inside of the parabolic reflector 2 in the radial direction. Specifically, each stay 4 extends from the peripheral edge of the parabolic reflector 2 toward the inside of the parabolic reflector 2 so as to be separated from the parabolic reflector 2 in the axial direction.
A plurality of stays (four in the illustrated example) are arranged at intervals in the circumferential direction of the parabolic reflector 2. The plurality of stays 4 are connected to each other at the tip portion 4A in the extension direction thereof. The plurality of stays 4 support the radiator 3 at the tip portion 4A in the extension direction thereof. Specifically, the radiator 3 is fixed to the tip portions 4A of the plurality of stays 4 (see FIG. 13).

As shown in FIGS. 6 to 9, the base end portion 4B in the extension direction of each stay 4 located on the peripheral edge side of the parabolic reflector 2 is attached to the base portion 7.
The base portion 7 is abutted against the outer peripheral surface 13 of the parabolic reflector 2. The base portion 7 is formed so as to be in surface contact with the outer peripheral surface 13 of the parabolic reflector 2. The base portion 7 is fixed to the outer surface 14 side of the parabolic reflector 2 in a state of being abutted against the outer peripheral surface 13 of the parabolic reflector 2. In the present embodiment, the base portion 7 is fixed to the radial rib 23 of the parabolic reflector 2 by screwing or the like.

As shown in FIGS. 7 and 8, the base portion 7 is positioned with respect to the boundary line 15 between the inner surface 11 (concave reflecting surface 12 in the illustrated example) and the outer peripheral surface 13 of the parabolic reflecting mirror 2. The base portion 7 has an alignment line 51 that coincides with the boundary line 15. In the present embodiment, the alignment line 51 is composed of the peripheral edge of the surface of the base portion that comes into surface contact with the outer peripheral surface 13 of the parabolic reflector 2.

As shown in FIGS. 7 and 9, the base portion 7 is abutted against the outer peripheral surface 13 of two circumferentially divided bodies 25 (25A, 25B) adjacent to each other in the circumferential direction. Then, the base portion 7 is positioned with respect to the boundary line 15 in the circumferential division body 25A of the two circumferential division bodies 25. That is, the base portion 7 is not positioned with respect to the boundary line 15 in the other circumferential division body 25B.
Specifically, the first portion 52 of the base portion 7 that abuts on the outer peripheral surface 13 of one of the circumferential divisions 25A of the base portion 7 abuts on the outer peripheral surface 13 of the other circumferential division 25. It protrudes toward the inner surface 11 of the parabolic reflector 2 from the second portion 53. That is, the alignment line 51 of the base portion 7 is formed only at the first portion 52 of the base portion 7.

As shown in FIGS. 6 and 9, the base portion 7 is abutted against the portion of the annular rib 22 forming the outer peripheral surface 13 of the parabolic reflector 2 to which the radial rib 23 is connected.
In the present embodiment, the portion of the annular rib 22 connected to the radial rib 23 is the end portion of the circumferential division 25 in the circumferential direction. Therefore, the base portion 7 is abutted against the region of the outer peripheral surface 13 of the circumferential division body 25 located at the end portion in the circumferential direction. The portion of the annular rib 22 to which the base portion 7 is abutted may be, for example, an overlapping portion in the radial direction of the parabolic reflector 2 with respect to the radial rib 23, or in the circumferential direction as illustrated in FIG. It may be a nearby site located near the overlapping site.

As shown in FIGS. 6 to 8, the base portion 7 is abutted against the proximal end portion of the outer peripheral surface 13 of the annular rib 22 in the extension direction of the annular rib 22 located on the inner surface 11 side of the parabolic reflector 2. That is, the base portion 7 does not abut against the tip portion of the annular rib 22 in the extension direction.

The base portion 7 may be formed in a block shape, for example. As shown in FIGS. 6 and 9, the base portion 7 of the present embodiment is composed of a pair of base plate portions 54, 55 arranged in the circumferential direction of the parabolic reflector 2 and sandwiching the stay 4. The pair of base plate portions 54, 55 also sandwich the radial rib 23 in the circumferential direction. The pair of base plate portions 54, 55 are fixed to each other by screwing or the like after sandwiching the stay 4 and the radial rib 23.
The base plate portions 54 and 55 may be formed in any shape that makes surface contact with the stay 4 and the radial rib 23. The base plate portions 54 and 55 of the present embodiment are formed in a flat plate shape. The pair of base plate portions 54, 55 may be formed in the same shape, for example, but are different from each other in the present embodiment. Of the pair of base plate portions 54, 55, the first base plate portion 54 includes the first portion 52 of the base portion 7 having the alignment line 51, and the second base plate portion 55 includes the second portion 53 of the base portion 7. include.

As shown in FIGS. 6, 7 and 9, the stay 4 of the present embodiment is a tubular pipe. The stay 4 may be, for example, a cylindrical pipe, but in the present embodiment, it is a square tubular pipe. As a result, the stay 4 can be brought into surface contact with the flat plate-shaped base plate portions 54 and 55.
As shown in FIGS. 9 and 10, the block 56 may be embedded in the base end portion 4B in the extension direction of the stay 4 attached to the base portion 7. The block 56 is mainly provided to form a hole in the base end portion 4B of the stay 4 for screwing the stay 4 to the base portion 7.

As shown in FIGS. 1 to 3, the waveguide 5 is arranged so as to extend from the outer surface 14 of the parabolic reflector 2 to the radiator 3 along the stay 4, and transmits an electromagnetic wave to the radiator 3. As shown in FIGS. 3 and 6, the waveguide 5 is directly attached to the parabolic reflector 2 on the outer surface 14 side of the parabolic reflector 2 without using the reinforcing frame 6.
Specifically, the waveguide 5 is attached to the parabolic reflector 2 via a plurality of (four in the illustrated example) supports 57. The plurality of supports 57 are arranged so as to be spaced apart from each other in the longitudinal direction of the waveguide 5. Each support 57 extends in a direction away from the outer surface 14 of the parabolic reflector 2 so as not to interfere with the reinforcing frame 6. The waveguide 5 is attached to the tip of each support 57. As a result, the waveguide 5 is arranged at a position spaced from the outer surface 14 of the parabolic reflector 2. In this embodiment, the base end portion of each support 57 is attached to the radial rib 23.

As shown in FIGS. 2 and 11, the waveguide 5 is arranged so as to overlap the stay 4 in the axial direction of the parabolic reflector 2 on the inner surface 11 side of the parabolic reflector 2. Specifically, the waveguide 5 is arranged at a position farther from the parabolic reflector 2 than the stay 4. The waveguide 5 is attached to the stay 4 via a plurality of (two in the illustrated example) supports 58 arranged at intervals in the longitudinal direction thereof.
The stay 4 is arranged so as not to protrude from both ends of the waveguide 5 in the extension direction (L direction in FIG. 11) and the width direction orthogonal to the axial direction of the parabolic reflector 2 (W direction in FIG. 11). ..

As shown in FIGS. 6 and 7, the waveguide 5 is supported by the base portion 7 at the peripheral edge of the parabolic reflector 2 as in the case of the stay 4.
In the present embodiment, the parabolic antenna device 1 includes two waveguides 5 described above, and the two waveguides 5 are arranged along stays 4 separate from each other, but the present invention is not limited to this. The waveguide 5 may be, for example, one or three or more. Further, for example, a plurality of waveguides 5 may be arranged along the same stay.

Further, in the parabolic antenna device 1 of the present embodiment, as illustrated in FIGS. 5, 12, and 13, a jig mounting portion 8 may be provided in the central portion of the parabolic reflector 2. The central portion of the parabolic reflector 2 is a portion through which the axis A1 of the parabolic reflector 2 passes. The jig mounting portion 8 mounts the radiator positioning jig 100 for positioning the radiator 3 with respect to the center of the inner surface 11 (concave reflecting surface 12) of the parabolic reflecting mirror 2 from the inner surface 11 side of the parabolic reflecting mirror 2. It is configured. Hereinafter, this point will be specifically described.

A fitting hole 16 penetrating from the inner surface 11 side to the outer surface 14 side in the axial direction is formed in the central portion of the parabolic reflector 2. The jig mounting portion 8 is fitted into the fitting hole 16. On the surface 61 (exposed surface 61) exposed on the inner surface 11 side of the parabolic reflector 2 of the jig mounting portion 8, a female screw hole 62 for screwing the radiator positioning jig 100 to the jig mounting portion 8 is provided. It is open. Further, an insertion hole 63 for inserting the radiator positioning jig 100 is opened in the exposed surface 61 of the jig mounting portion 8. The insertion hole 63 may be, for example, a bottomed hole, but in the present embodiment, the insertion hole 63 penetrates in the axial direction of the parabolic reflector 2.
Further, the jig mounting portion 8 includes a flange portion 64 that abuts on the outer surface 14 of the parabolic reflector 2 in a state of being fitted into the fitting hole 16. By abutting the flange portion 64 against the outer surface 14 of the parabolic reflector 2, the exposed surface 61 of the jig mounting portion 8 on which the radiator positioning jig 100 is arranged can be positioned with high accuracy.

The radiator positioning jig 100 is formed in a rod shape extending in the axial direction from the central portion of the inner surface 11 of the parabolic reflector 2. The radiator 3 to be positioned is arranged at the tip of the radiator positioning jig 100. At the base end of the radiator positioning jig 100, a contact end surface 101 that comes into surface contact with the exposed surface 61 of the jig mounting portion 8 and a contact end surface 101 that protrudes from the contact end surface 101 and is inserted into the insertion hole 63 of the jig mounting portion 8. The insertion portion 102 and the insertion portion 102 are formed.
When attaching the radiator positioning jig 100 to the jig mounting portion 8, first, the inserting portion 102 is inserted into the insertion hole 63 of the jig mounting portion 8, and the contact end surface 101 is exposed to the jig mounting portion 8. It may be brought into surface contact with the surface 61. Next, the screw 103 may be passed through the base end portion of the radiator positioning jig 100 from the inner surface 11 side of the parabolic reflector 2 and then screwed into the female screw hole 62 of the jig mounting portion 8.

The parabolic antenna device 1 of the present embodiment configured as described above is, for example, a weather radar or the like, and includes a turntable 9 to which the parabolic reflector 2 is attached, as illustrated in FIG. The turntable 9 is a parabolic reflector centered on a vertical axis A2 (axis extending in the vertical direction in FIG. 1) and a horizontal axis A3 extending in the horizontal direction (axis extending in the direction perpendicular to the paper surface in FIG. 1). Rotate 2. As a result, the parabolic reflector 2 can be oriented in various directions by the rotary table 9.

As described above, in the parabolic antenna device 1 of the present embodiment, each base portion 7 is fixed to the parabolic reflector 2 with reference to the outer peripheral surface 13 (periphery) of the parabolic reflector 2, and each stay is attached to each base portion 7. The base end portion 4B of 4 is attached. As a result, each stay 4 can be extended inward of the parabolic reflector 2 in the radial direction with reference to the peripheral edge of the parabolic reflector 2 having high dimensional accuracy. Therefore, the radiator 3 provided at the tip portions 4A of the plurality of stays 4 is easily higher than the parabolic reflector 2 only by improving the dimensional accuracy in the extension direction of each stay 4 (machining accuracy of the stay 4). It can be positioned with accuracy. Therefore, the parabolic antenna device 1 can be easily manufactured.

Further, when manufacturing the parabolic antenna device 1, it is not necessary to adjust the length of each stay 4 with an adjusting screw as in the conventional case, so that it is possible to suppress the occurrence of bending in each stay 4. Therefore, it is possible to suppress changes in the radio wave characteristics of the parabolic antenna device 1 based on the stay 4.
Further, since the base portion 7 is directly fixed to the parabolic reflector 2 without passing through the reinforcing frame 6, the stay 4 is parabolic with high position accuracy without being affected by the mounting position of the reinforcing frame 6 with respect to the parabolic reflector 2. It can be attached to the reflector 2.

Further, in the parabolic antenna device 1 of the present embodiment, the base portion 7 is positioned with respect to the boundary line 15 between the inner surface 11 and the outer peripheral surface 13 of the parabolic reflector 2. Therefore, the base portion 7 can be positioned with higher accuracy with respect to the parabolic reflector 2. Therefore, the positional accuracy of the radiator 3 with respect to the parabolic reflector 2 (particularly, the positional accuracy of the radiator 3 in the axial direction of the parabolic reflector 2) can be further improved.

Further, in the parabolic antenna device 1 of the present embodiment, when the base portion 7 is abutted against the outer peripheral surface 13 of the two circumferential divisions 25 adjacent to each other in the circumferential direction, the boundary line in one of the circumferential divisions 25A. Positioned only for 15. Therefore, even if the positions of the boundary lines 15 do not coincide with each other between the two adjacent parabolic divisions, the positioning of the base portion 7 with respect to the parabolic reflector 2 can be easily and reliably performed.

Further, in the parabolic antenna device 1 of the present embodiment, the base portion 7 is abutted against the portion of the annular rib 22 to which the radial rib 23 is connected. Therefore, even if the base portion 7 is abutted against the outer peripheral surface 13 of the annular rib 22, it is possible to prevent the annular rib 22 from being deformed so as to bend with respect to the bowl-shaped plate portion 21 due to the radial rib 23. Therefore, it is possible to prevent the position of the base portion 7 with respect to the parabolic reflector 2 (particularly, the position of the parabolic reflector 2 in the radial direction) from changing.

Further, in the parabolic antenna device 1 of the present embodiment, the base portion 7 is abutted against the base end portion of the outer peripheral surface 13 of the annular rib 22 in the extension direction of the annular rib 22 extending from the peripheral edge of the bowl-shaped plate portion 21. Therefore, even if the base portion 7 is abutted against the outer peripheral surface 13 of the parabolic reflector 2, it is possible to prevent the annular rib 22 from being deformed so as to bend with respect to the bowl-shaped plate portion 21. Therefore, it is possible to prevent the position of the base portion 7 with respect to the parabolic reflector 2 (particularly, the position of the parabolic reflector 2 in the radial direction) from changing.

Further, in the parabolic antenna device 1 of the present embodiment, the stay 4 is a square tubular pipe. That is, the stay 4 has an appearance including a flat outer surface 14 and corners. Therefore, various parts (for example, a waveguide 5) can be easily attached to the stay 4 as compared with the case where the stay 4 is a cylindrical pipe.
Further, the square tubular stay 4 has a hole for screwing the stay 4 to the base portion 7 and a hole for attaching various parts to the stay 4 more easily than the cylindrical stay 4. It can also be formed. The ability to easily form the hole is particularly effective when the hole is formed at the assembly site of the parabolic antenna device 1.

Further, when the stay 4 is a square tubular pipe, even if the stay 4 is formed so that the rigidity of the stay 4 is high, the influence of the stay 4 on the radio wave characteristics of the parabolic antenna device 1 can be reduced. This point will be described below. When the stay 4 is a cylindrical pipe, it is necessary to increase the diameter of the stay 4. Therefore, in a plan view of the inner surface 11 of the parabolic reflector 2 from the axial direction, the area (projected area) of the stay 4 overlapping the inner surface 11 of the parabolic reflector 2 becomes large, and as a result, the parabolic antenna device 1 The influence of the stay 4 on the radio wave characteristics becomes large. On the other hand, when the stay 4 is a square tubular pipe, the rigidity of the stay 4 can be increased by forming the cross section of the stay 4 into a rectangular annular shape. By arranging the stay 4 so that the long side of the rectangular cross section extends in the axial direction of the parabola reflector 2, the area of the stay 4 overlapping the inner surface 11 of the parabola reflector 2 can be reduced. Therefore, the influence of the stay 4 on the radio wave characteristics of the parabolic antenna device 1 can be reduced.

Further, in the parabolic antenna device 1 of the present embodiment, the stay 4 arranged so as to overlap with the waveguide 5 has an extension direction (L direction) and a width direction (W direction) orthogonal to the axial direction of the parabolic reflector 2. It is arranged so as not to protrude from both ends of the waveguide 5 in the above. As a result, the influence of the stay 4 on the radio wave characteristics of the parabolic antenna device 1 can be made smaller than that of the waveguide 5.

Further, in the parabolic antenna device 1 of the present embodiment, the block 56 is embedded in the base end portion 4B of the stay 4 formed in a cylindrical shape. As a result, at the assembly site of the parabolic antenna device 1, a hole for screwing the stay 4 to the base can be easily formed in the base end portion 4B of the stay 4 without deforming the tubular stay 4. can.

Further, in the parabolic antenna device 1 of the present embodiment, the waveguide 5 is directly attached to the parabolic reflector 2 without going through the reinforcing frame 6. Therefore, as compared with the case where the waveguide 5 is attached to the parabola reflector 2 via the reinforcing frame 6, the waveguide 5 is not affected by the attachment position of the reinforcing frame 6 with respect to the parabolic reflector 2. It can be attached to the parabolic reflector 2 with high position accuracy. That is, the waveguide 5 and the radiator 3 connected to the waveguide 5 can be easily positioned.
Further, since the mounting position of the reinforcing frame 6 with respect to the parabolic reflector 2 does not affect the positioning of the waveguide 5 and the radiator 3 with respect to the parabolic reflector 2, it is necessary to mount the reinforcing frame 6 to the parabolic reflector 2 with high accuracy. It disappears. Therefore, the reinforcing frame 6 can be easily attached to the parabolic reflector 2.

Further, in the parabolic antenna device 1 of the present embodiment, when the parabolic reflector 2 is composed of the central division body 26 and the plurality of circumferential division bodies 25, the inner peripheral surface of the cylindrical flange portion 27 of the central division body 26 A nut component 28 for screwing the circumferential division body 25 to the central division body 26 is fixed to the center. As a result, the circumferential division body 25 can be easily screwed to the central division body 26 without the operator getting inside the tubular flange portion 27. Further, since the cylindrical flange portion 27 can be formed thinner than the case where the female screw is directly formed on the tubular flange portion 27, the weight of the parabolic antenna device 1 can be reduced.

Further, in the parabolic antenna device 1 of the present embodiment, the parabolic reflector 2 is a “edgeless” reflector in which the concave reflecting surface 12 and the outer peripheral surface 13 are directly connected. As a result, the size of the parabolic reflector 2 can be reduced (particularly, the diameter dimension can be reduced) as compared with the “rimmed” reflector. Further, since the mold for manufacturing the parabolic reflector 2 (mold for manufacturing the reflector) can be made smaller, the manufacturing cost of the parabolic antenna device 1 can be reduced. Further, since the shape of the reflector manufacturing mold is simplified, the parabolic reflector 2 can be easily manufactured.

Further, in the parabolic antenna device 1 of the present embodiment, the jig 100 illustrated in FIG. 12 is attached so that the radiator positioning jig 100 can be attached to the central portion of the parabolic reflector 2 from the inner surface 11 side of the parabolic reflector 2. The part 8 is provided. Thereby, as illustrated in FIG. 13, the radiator positioning jig 100 can be easily attached to the parabolic reflector 2 only by the work on the inner surface 11 side of the parabolic reflector 2.

As illustrated in FIG. 14, the jig mounting portion 8 of the present embodiment is configured so that the radiator positioning jig 100A can be mounted from the outer surface 14 side of the parabolic reflector 2. Specifically, a female screw for screwing the radiator positioning jig 100A to the jig mounting portion 8 is provided on the surface 65 (outer surface 65) of the jig mounting portion 8 facing the outer surface 14 side of the parabolic reflector 2. The hole 66 is open.
Therefore, when the radiator positioning jig 100A is attached to the parabola reflecting mirror 2, the radiator positioning jig 100A is first inserted into the insertion hole 63 of the jig mounting portion 8 from the outer surface 14 side of the parabola reflecting mirror 2. The flange portion 104A formed at the base end portion of the radiator positioning jig 100A may be abutted against the outer surface 65 of the jig mounting portion 8. Next, the screw 103A may be passed through the flange portion 104A of the radiator positioning jig 100A from the outer surface 14 side of the parabolic reflector 2 and then screwed into the female screw hole 66 of the jig mounting portion 8.

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

1 Parabolic antenna device 2 Parabolic reflector 3 Radiator 4 Stay 4A Tip part 4B Base end part 5 waveguide 6 Reinforcing frame 7 Base part 8 Jig mounting part 9 Rotating table 11 Inner surface 12 Concave reflecting surface 13 Outer surface 14 Outer surface 15 Boundary line 21 Bowl-shaped plate 22 Circular rib 23 Radial rib 24 Inner peripheral surface of annular rib 22 25 Circumferential division 25A One circumferential division 26 Central division 27 Cylindrical flange 28 Nut part 56 Block 100, 100A radiator positioning jig

Claims (4)

A bowl-shaped parabolic reflector and
A radiator that radiates electromagnetic waves toward the inner surface of the parabolic reflector,
A plurality of stays extending from the peripheral edge of the parabolic reflector to the inside of the parabolic reflector in the radial direction and supporting the radiator at the tip portion in the extending direction are provided.
The base end portion of each stay located on the peripheral side of the parabolic reflector in the extension direction is attached to the base portion fixed to the outer surface side of the parabolic reflector in a state of being abutted against the outer peripheral surface of the parabolic reflector. ,
A parabolic antenna device in which the base portion is positioned with respect to a boundary line between the inner surface and the outer peripheral surface . The parabolic reflector comprises a plurality of circumferential dividers arranged in the circumferential direction of the parabolic reflector.
The first aspect of claim 1 , wherein the base portion is abutted against the outer peripheral surfaces of two circumferentially divided bodies adjacent to each other in the circumferential direction and is positioned with respect to the boundary line of one of the circumferentially divided bodies. Parabolic antenna device. The parabolic reflector extends from the bowl-shaped plate portion forming the inner surface and the outer surface and the peripheral edge of the bowl-shaped plate portion toward the outer surface side of the bowl-shaped plate portion in the axial direction of the parabola reflector to extend the outer peripheral surface. An annular rib is provided, and a radial rib that protrudes from the outer surface of the bowl-shaped plate portion and extends radially inward from the inner peripheral surface of the bowl-shaped plate portion.
The parabolic antenna device according to claim 1 or 2 , wherein the base portion is abutted against a portion of the annular rib to which the radial rib is connected. The parabolic reflector extends from the bowl-shaped plate portion forming the inner surface and the outer surface and the peripheral edge of the bowl-shaped plate portion toward the outer surface side of the bowl-shaped plate portion in the axial direction of the parabolic reflector to extend the outer peripheral surface. Eggplant ring ribs and
The parabolic antenna device according to any one of claims 1 to 3 , wherein the base portion is abutted against a base end portion of the outer peripheral surface of the annular rib in an extension direction of the annular rib.

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