JPS6145604A - Antenna having split type reflection mirror - Google Patents

Abstract

PURPOSE:To attain matching and adjustment of the mirror face of a reflection mirror simply in a short time with high accuracy by incorporating in advance a reference plate gauge to an antenna. CONSTITUTION:The antenna has the constitution that a split type reflection mirror 12 formed by arranging and bonding plural split mirror surface panels 14 radially around an inner circular mirror surface panel 13 fitted on the front face of a center hub 11 is fixed and supported by a supporting frame 15. Then the reference plate gauge 21 whose upper end face 21a is formed as a reference end face is fixed to the side face of the split supporting frame 15a in a dismountable way so that the upper end face 21a is in matching with a normal curve of cross section of a reflection concaved face of the reflection mirror 12. The mirror surface is matched and adjusted by fitting a boat form turning gauge 30 onto a center hub and turning the gauge 30 after a displacement sensor 35 is subjected to measuring reference calibration by using the reference plate gauge 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an antenna having a segmented reflector, and more particularly to an antenna structure that can simplify assembly of the segmented reflector during on-site assembly. It is related to.

For example, an antenna with a segmented reflector for high frequencies such as the sub-millimeter wave band used in satellite communications has a reflecting mirror surface that is formed with high precision relative to a theoretical concave curved surface such as a paraboloid of revolution. required. This type of antenna is assembled in advance at an assembly factory, and the precision of the casting surface of the reflector is thoroughly confirmed, and then disassembled into each divided mirror surface, flannel, and other parts. It is common for the antenna to be transported to the antenna installation site (on-site) by means of transportation such as a truck, and then reassembled there. For this reason, locally,
It is necessary to fully reproduce the mirror surface accuracy of the reflecting mirror when assembling it. Therefore, it is desired that this type of antenna has a structure that allows easy assembly and adjustment of the split reflector during on-site assembly, and that can sufficiently reproduce the precision of the reflector surface.

[Conventional technology]

FIGS. 2 and 3 are diagrams for installing an antenna having a conventional split reflector.

FIG. 2 shows a schematic front view 0) of a conventional antenna 10;
It is an Ax-AgJl sectional view of (a). In addition, when looking at FIG. 2(b), the upper side will be referred to as the front middle (front elevation) of the antenna 10, and the lower side will be referred to as the rear side (back side). In the figure, reference numeral 11 indicates a center hub, 12 indicates a split reflecting mirror (main reflection fi), and 15 indicates a support framework. An inner circular mirror surface wall 13 constituting the reflecting mirror 12 is arranged and fixed concentrically with the center line C on the approximately surface of the center hub 11, and a plurality of inner circular mirror panels 13 are arranged along the outer periphery of the inner circular mirror surface 13 (in this case, The reflecting mirror 12 is constructed by radially arranging 12 divided mirror panels 14 (consisting of 12 divided mirror panels 14 divided into 12 equal parts). A through hole 13a is bored in the center of the inner circular mirror surface/4' channel 13 through which a primary radiator (not shown) is inserted. On the outer periphery of the center hub 11, divided support frames 15a are arranged radially extending in the radial direction along each radially adjacent side B of each divided mirror panel 14, and these divided support frames 12a are mutually arranged. The support framework 15 is configured by being connected. The inner periphery of this support framework 15 is connected and fixed to the outer periphery of the center hub 11. Each divided support frame 15a
Adjustable fixing supports 16 and 17 are provided at the inner and outer parts of the front end fixing, respectively. Each divided mirror surface iJ? The flannel 14 is fixedly supported on the support framework 15 after being mirror-adjusted by these adjusting and fixing supports 16 and 17. This antenna 10 is constructed as described above, and the assembly matching ni of the reflecting mirror 12 during on-site assembly is performed as follows.

Although this antenna 1O is not shown in the drawing for ease of separation, it is actually completed by adding a sub-reflector and other parts.

Now, with reference to FIG. 2←) and FIG. 3, the assembly and alignment adjustment of the reflecting mirror 12 on site will be explained. In FIG. 3, reference numeral 30 indicates a boat-shaped rotary gauge (mirror surface accuracy measuring device), 31 indicates a reference plate gauge, and 32 indicates a surface plate. The boat-shaped rotation gauge 30 mainly includes a rotation support shaft 33, a boat-shaped frame 34 attached to the rotation shaft 33 and movable around the center line C, and a displacement sensor (2) disposed on the lower edge of the boat-shaped frame 34. In this case, there are two supporting members 35 and a supporting member 36 on the opposite side of the boat-shaped frame 34.
a.

36, which is attached to a support shaft 33 via a parallel plate 36. The reference plate gauge 31 has a reference end face 31ai
The cross-sectional curve of this reference end face 31m is formed into a regular reflective mirror cross-sectional curve.

Now, when assembling the reflector 12, first, as shown in FIG. on the other hand,
As shown in FIG. 3, the measurement reference value calibration of the displacement sensor 35 of the boat-shaped rotary dart 3o (zero position setting of the sensor 35) is performed using the surface plate 32 and the reference plate gauge 31 placed thereon. , this calibrated boat-shaped rotating dart 3o is
As shown by the two-dot chain line in the figure (=), the center line C of the rotation support shaft
Attach the displacement sensor 35 to the front surface of the center hub 11 so that it coincides with the center line C of the center hub 11.At this time, the distal end of the displacement sensor 35 is placed on the reflective surface (concave curved surface) of the split mirror surface and the buttock 14. Then, the boat-shaped rotation gauge 3
0 around the center line C, l11! By adjusting the P fixing supports 16 and 17, each divided mirror surface channel 14 is moved up and down to align its reflective surface with the measurement reference value (0 position) of the displacement sensor 35, thereby adjusting the accuracy. In this way, the boat-shaped rotary gauge 3o is rotated once (360').
From the step K, the precision adjustment of the reflective concave curved surface of the reflective mirror 12 is completed, and each divided mirror panel 14 is attached to the adjustment fixing support 16.
．． 17 on the support framework 15.

The adjustment and fixing supports 16, 17Fi and the split mirror panel 14 are formed to have both the function of vertically moving and adjusting them as well as the function of fixing and supporting them.

[Problems to be Solved by the Invention] In the above structure, when adjusting the alignment of the reflective concave curved surface of the split reflector during on-site assembly, one separate sensor is used to calibrate the displacement sensor of the boat-shaped rotation gauge. It is necessary to use a standard plate gauge and surface plate. Therefore, it is necessary to transport six reference gauges and surface plates to the site, and it is also necessary to use a crane or the like to move and install them at the site. Furthermore, since the surface plate is very heavy, it is necessary to set the floor surface where the surface plate is installed to be strong. Therefore, there are problems in that assembly and adjustment of the split reflector is complicated and time-consuming, and transportation costs are high, resulting in high on-site assembly costs for the antenna.

[Means for solving problems]

The present invention provides an antenna having a split reflector that solves the above-mentioned problems.As a means for achieving this, a plurality of split mirror panels are arranged radially around an inner circular mirror panel attached to the front surface of a center hub. In the antenna, the antenna has a split reflecting mirror arranged and joined to form a reflective concave curved surface such as a paraboloid of revolution, and the reflecting mirror is fixedly supported by a support framework connected to the center hub. Between the end faces of at least one of the joint sides adjacent to each other in the radial direction at multiple locations between each divided mirror surface or flannel, the cross-sectional curve of the regular reflective concave curved surface extends along the joint side. An antenna having a split reflector, in which a reference plate gauge having a reference end face with a cross-sectional curve accurately formed is integrated and removably incorporated into the support frame with the reference end face placed at a proper position. is provided.

[Effect]

In the above antenna, at least one reference plate gauge is incorporated between the end faces of the radially adjacent joint sides of the plurality of split mirror surface i4 channels constituting the split reflector, so this reference plate gauge is used. It is possible to calibrate the measurement reference value of the displacement sensor (setting the 0 position of the displacement sensor 35) with a mirror surface accuracy measuring device (for example, a boat-shaped rotary gauge) attached to the antenna, and then calibrate the measurement standard value of the displacement sensor 35. Mirror alignment adjustment can be performed. Therefore, there is no need to carry separate reference plate gauges and surface plates to the assembly site, and there is also no need for a crane or the like to move and install these at the site.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram for explaining Embodiment 20 of an antenna having a split reflector according to the present invention, in which 0) is a schematic front view thereof, and ←) is a Ds-Dzllll sectional view of 0).・
In addition, when facing Fig. 1 ←), the upper side is the front f of Example 20.
lll (front side), and the lower side is backward
I will call it ll). Further, in these figures, the same or equivalent parts as in FIGS. 2 and 3 described above are designated by the same reference numerals. Therefore, reference numeral 11 is a center hub, 12 is a split reflector, 13 is an inner circular mirror nozzle, and 13a is a primary radiator (not shown) bored in the center of the inner circular mirror nozzle (13). Penetration type for inserting, 1
4 is a split mirror panel, 15 is a support framework, 15m is a split support frame constituting the support framework (15), 16.17 is an adjustable fixed support disposed on the split support frame (15a), and 30 is a boat-shaped A rotation gauge (mirror surface accuracy measuring device) and 35 indicate a displacement sensor. Since the respective parts of these parts are constructed in the same manner as shown in FIG. 2 described above, their explanations will be omitted. Reference numeral 21 indicates a reference plate gauge according to the present invention. The reference plate gauge 21 has its upper end surface 21IL formed as a reference end surface, and its cross-sectional curve is the same as that of the reflecting mirror 12.
The regular cross-sectional curve # (m-theoretical shearing force curve) of the reflective concave curved surface is accurately finished using techniques such as NC machining (numerically controlled machining). This corresponds to the reference plate gauge 31 shown in FIG. As shown in FIG. 1(A), this base plate gauge 21 is attached to the joint side B between the end faces of the radially adjacent joint sides B of the divided mirror-surfaced flanges 14-1 and 14-2. The upper end surface 21a of the reflector 12 reflects the reflection mirror 12, as shown in FIG. 1(b). ! It is arranged to match the regular cross-sectional curve of the I-curved surface, is positioned by positioning dowel pins (two in this case) 22, and is removably fixed to the side surface of the divided support frame 15m. Therefore, during on-site reassembly, the reference plate gauge 21 can be easily positioned at the correct position using the dowel pins 22, and can be integrally fixed to the support framework 15. In this way, by providing the reference plate gauge 21, as shown by the two-dot chain line in FIG.
The boat-shaped rotation gauge 30 can be directly attached to the center hub 11 and the reference plate gauge 21 can be used to calibrate the measurement reference value of the displacement sensor 35 (setting the O position of the displacement sensor 35). Thereafter, the mirror surface alignment adjustment of the reflecting mirror 12 can be performed while continuing to rotate the boat-shaped rotation gauge 30.

Therefore, according to this embodiment, the displacement sensor 35 of the boat-shaped rotation gauge 30 can be calibrated directly on the antenna 20, so that the number of man-hours for assembling the antenna can be reduced and assembly adjustment can be facilitated. In addition, reference plate gauge 2
1 is preferably made of a metal material with a small coefficient of thermal expansion, and its thickness is appropriately set depending on the size of the aperture of the reflecting mirror 12, and is set to about 5 mm as an example. Further, in the above embodiment, the case where one reference plate gauge 21 is provided is illustrated, but two of these may be arranged, for example, so as to be located at 180° from each other, and thereby, the reference plate gauge 21 of the displacement sensor 35 can be Calibration can be performed more accurately, and the adjustment accuracy of the reflecting mirror surface can be further improved. In this way, the number of reference plate gauges 21 can be set as required.

〔Effect of the invention〕

As described above in detail, according to the present invention, the reference plate gauge is pre-installed in the antenna, so a mirror surface accuracy measuring device (for example, a boat-shaped rotating gauge) is directly attached to the antenna, and the reference plate gauge is attached to the antenna. can be used to perform reference value calibration of the displacement sensor of the measuring device directly on the antenna,
The mirror surface matching adjustment of the reflecting mirror can be subsequently performed in this state. Therefore, the mirror surface matching adjustment of the reflecting mirror can be easily and precisely performed in a short time, and the number of man-hours required for assembling the antenna can be significantly reduced. Furthermore, it is not necessary to bring separate reference plate gauges and surface plates to the site, and it also eliminates the need for cranes, etc. to move and install them on site, reducing the transportation costs required for these. It has the effect of being able to As a result, the cost for on-site assembly of the antenna can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining Embodiment 2o of the present invention, and its schematic front view 0) and DI-D of (A). FIG. 2 is a diagram for explaining an antenna 10 having a conventional split reflector, and FIG.
A schematic front view 0) and a sectional view taken along the Al-A2 line in (A) ←
), and FIG. 3 shows a displacement sensor 35 of a boat-shaped rotary gauge 3o using a board gauge 31 and a surface plate 32 at the site.
FIG. 3 is a diagram showing a state in which calibration is performed. 20... Example of the present invention, 11... Center hub,
12...Divided reflective pin, 13...Inner circular mirror surface/IP flannel, 13 m - through hole, 14.14-1.14-2
... Divided mirror panel, 15... Support framework, 15a.
...Divided support frame, 16.17...Adjustment fixing support, 2
DESCRIPTION OF SYMBOLS 1... Reference plate gauge according to the present invention, 21a... Upper end surface (reference end surface), 22... Positioning dowel pin, 3
0... Boat-shaped rotation gauge. Figure 1 [ (b)

Claims (1)

[Claims] 1. It has a split reflector in which a reflective concave curved surface such as a paraboloid of revolution is formed by arranging and joining a plurality of split mirror panels radially around an inner circular mirror panel attached to the front surface of the center hub. , and an antenna in which the reflector is fixedly supported by a support framework connected to the center hub, an end face of at least one joint side among the plurality of radially adjacent joint sides of each of the split mirror panels; between each other,
A reference plate gauge having a reference end face extending along the joint side and having a cross-sectional curve accurately formed with respect to the cross-sectional curve of the normal reflective concave curve 1 is attached to the reference plate gauge with the reference end face disposed at a normal position. An antenna having a split reflector, characterized in that it is integrated into a supporting frame and can be disassembled.