JP4064836B2 - Antenna and antenna manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, for example, when transmitting and receiving UHF and other communication signals, a plurality of through holes are provided at appropriate intervals in the axial direction of the hollow tubular boom, and pipes are provided to the through holes. The present invention relates to an antenna of a type that is fixed and used in a state in which a rectangular antenna element is penetrated.
[0002]
[Prior art]
Conventionally, a plurality of through-holes are provided at positions spaced apart at appropriate intervals in the axial direction of the hollow tubular boom, and each of the through-holes is oriented in a direction perpendicular to the axis of the boom. An antenna in which a pipe-like antenna element is passed through each of the antennas and these antenna elements are fixed to a boom and a method of manufacturing such an antenna are widely known (for example, see Patent Document 1).
Usually, as a rod-shaped material used for the boom, a hollow tubular pipe material (hollow pipe material whose periphery is closed) is used as is apparent from Patent Document 1 and Patent Document 2.
Possible reasons for using a hollow tubular pipe material for the boom material are:
As a first point, there is an advantage that a boom having a relatively large bending strength can be obtained even if the material of the thin hollow tube is used, and the whole can be reduced in weight.
In addition, as a second point, an operator engaged in antenna construction prefers a boom material made of a hollow tubular material from the viewpoint of handling (ease of gripping). It seems that it is used like patent document 2.
However, it is extremely difficult to fix the antenna element to the hollow tubular boom. That is, the outer shape of the hollow tubular boom is “closed on the outer peripheral surface”. Accordingly, it is impossible to directly fix the antenna element and the inside of the boom by directly operating the member positioned inside the tube, for example, the antenna element inserted into the hollow tube body from the outside.
Therefore, the conventional antenna element fixing means inserts a metal hollow tube made of a plastic material into the antenna element tube, positions it around the axis of the boom, and places both sides in the hollow tube. The end of the rod-shaped jig is inserted from the side, and the inlet of the hollow tube is deformed in the radial direction by applying pressure from both sides, and the entire circumference of the tube wall inside the boom in the antenna element is expanded in the radial direction by the deformation action. Thus, means for fixing the antenna element to the boom by using pressure contact with the inner edge of the through hole of the boom is used.
[0003]
[Patent Document 1]
JP 57-11001 A (FIGS. 3 and 6)
[Patent Document 2]
Japanese Utility Model Publication No. 57-2707 (FIG. 3)
[0004]
[Problems to be solved by the invention]
In this conventional antenna manufacturing method, the degree of expansion of the tube ports at both ends of the hollow tube is larger than the degree of expansion at the center of the hollow tube, and inevitably the hole in the tube wall inside the boom in the antenna element. The wall of the tube near the edge is locally expanded radially with a sharp angle. As described above, when a part of the tube wall is locally expanded, there is a problem of lack of durability such that the tube wall is repeatedly subjected to repeated bending loads due to use over time. Further, since one hollow tube is required as a consumable for one antenna element, there is a problem that the cost of parts increases and the production cost increases.
Therefore, in order to save the above consumables, the means shown in FIG. 5 is a means for mechanically expanding the tube wall near the hole edge in the tube wall in the boom of the hollow tube in the antenna element without using consumables. (See, for example, Patent Document 2).
[0005]
An antenna manufactured by such a known means is manufactured by penetrating the antenna element 6 into the tube of the hollow tube boom 2 and fixing the antenna element 6 to the boom 2 at the time of manufacture. The inclined facing surfaces 15 and 15 at the respective tips of 14 are in the ready state of FIG. 5A, and then the inclined facing surfaces 15 and 15 at the respective tips of the rod-shaped jigs 14 and 14 are formed. , Advance from both sides to the position of FIG. As a result, the overlapping of the inclined facing surfaces 15 and 15 increases, so that the outer periphery of the overlapping portion of the facing surfaces 15 and 15 increases, and the inner diameter of the antenna element 6 expands as shown in the figure. However, when dust 16 is interposed between the opposing surfaces 15 and 15 in such work, the outer periphery of the overlapping portion of the opposing surfaces 15 and 15 becomes larger than the predetermined dimension, and the hole edge of the boom tube wall 4 is shown in the drawing. There is a problem that the bulging amount of the bulging portion 7a to be formed near 4b protrudes larger than expected and damages the tube wall 7 of the antenna element 6 near the hole edge 4b of the tube wall of the boom.
Further, when the overlapping of the opposed surfaces 15 and 15 in the inclined state is less than planned, the bulging portion 7a of the antenna element 6 does not protrude near the hole edge 4b of the tube wall of the boom 2 and is larger than the planned location. The bulging part 7a protrudes near the middle part in the pipe of the boom 2. Then, the bulging portion 7a is separated without contacting the inside of the hole edge 4b of the boom, and the antenna element is not fixed and is displaced in the axial direction, thereby increasing the defective product occurrence rate.
[0006]
Moreover, even if the bulging portion 7a protrudes near the hole edge 4b of the tube wall of the boom 2 and the antenna element 6 is fixed as planned, the antenna is exposed to a storm and the boom 2 and the antenna element 6 are When receiving the vibration due to the storm, the antenna element protruding from the boom 2 vibrates around the bulging portion 7a near the hole edge 4b of the boom tube wall.
This means that the antenna element is subjected to repeated bending loads around the weakened bulge 7a due to the resonance phenomenon, and the tube wall of the antenna element is localized by metal fatigue near the bulge 7a. There was a problem of damage and breakage.
[0007]
In order to solve the problems of the prior art in which the antenna of the present application uses a hollow tube boom in which the periphery of the boom is closed like the hollow tube booms of Patent Documents 1 and 2 above . It is to provide.
The purpose of the present application is to fix the antenna element to the hollow tube boom in a state where the fixed portion is hidden outside the hollow tube boom and cannot be seen from the outside, and is beautiful in appearance. It is intended to provide an antenna that is fixed in a.
Another object of the present application is that even when the antenna is exposed to a storm and the antenna element is subjected to resonance vibration due to the storm, the fastening portion of the base of the antenna element protruding from the boom is not significantly affected. In the boom pipe, the antenna element is set at an intermediate position away from the tube wall hole of the boom, and the antenna element is received at the edge of the hole in the boom wall of the boom. An object of the present invention is to provide an antenna that can soften the phenomenon, prevent damage near the edge of the tube wall hole of the boom in the antenna element, and increase the life of the antenna element.
[0008]
Another object of the present application is that when the antenna element is passed through the boom and the antenna element is fixed to the boom, the fixing location may be limited to the vicinity of the hole edge of the inner wall of the boom as in the conventional product. There is a wide selection range of the antenna element in the boom so that the coupling location can be selected with rough machining accuracy. It is something to be offered.
Another object of the present application is to simply deform the boom wall in the boom tube when passing the antenna element through the boom and fix the antenna element to the boom, so that the free end of the rib in the boom tube is a hollow tubular antenna. An object of the present invention is to provide an antenna in which a concave portion is formed on the outer peripheral surface of a hollow tubular antenna element and a free end of a rib can be fitted at the same time by an operation of pressing against the tube wall of the element.
Other objects and advantages will be readily apparent from the drawings and the following description associated therewith.
[0009]
[Means for Solving the Problems]
Antenna in the present invention, the wall of the hollow tubular boom, at a suitable distance in the axial direction, two pairs for pass through in a direction perpendicular to the antenna elements of the respective hollow tubular axis of the boom A plurality of tube wall holes, a hollow tubular antenna element is passed through each of the two pairs of tube wall holes, and the antenna elements are respectively fixed to the boom.
The antenna element is fixed to the hollow tubular boom.
In the tube of the hollow tubular boom, the antenna element in the cross-sectional shape is provided with ribs extending in the axial direction of the boom at both sides of the antenna element, and the base side in the cross-sectional shape of these ribs is Each of the hollow tubular booms is integrally fixed to the inner surface of the tube wall, the free end side is directed to face the antenna element, and the rib is directed from the base side toward the free end side. direction and have set in a direction crossing the axis of the antenna elements to be placed in the of stripping predetermined position,
The hollow tubular boom is positioned on both sides of the antenna element in the pipe by applying pressure to the outer wall of the hollow tubular boom from the outer periphery on both sides of the position where the antenna element is present in the hollow tubular boom. The bases of the two ribs are displaced in the direction of approaching each other,
The free end side of each rib is brought into contact with both sides of the tube wall of the antenna element in a state of being pressed from the direction intersecting the axis of the antenna element, and the antenna element is sandwiched from both sides. The antenna element is fixed to the hollow tubular boom.
[0010]
Preferably, the hollow tubular boom tube wall has a pair of two tubes for penetrating the hollow tubular antenna elements in a direction perpendicular to the boom axial center at an appropriate interval in the axial direction. A plurality of wall holes, in each of the two pairs of tube wall holes, a hollow tubular antenna element is penetrated, and the antenna elements are respectively fixed to the boom,
The antenna element is fixed to the hollow tubular boom.
In the tube of the hollow tubular boom, a plurality of ribs extending in the axial direction of the boom are provided in parallel with each other at both sides of the antenna element in the cross-sectional shape. The base portion side in the cross-sectional shape is integrally fixed to the inner surface of the tube wall on the side of the hollow tubular tube wall hole, and the free end side is oriented to face the antenna element, respectively. the direction toward the free end side from the base portion side of the rib and have set in a direction crossing the axis of the antenna elements to be placed in the of stripping predetermined position,
The hollow tubular boom is positioned on both sides of the antenna element in the pipe by applying pressure to the outer wall of the hollow tubular boom from the outer periphery on both sides of the position where the antenna element is present in the hollow tubular boom. Yes is displaced in the direction closer to each other the original part of each in two of the ribs,
The free end side of each rib is brought into contact with both sides of the tube wall of the antenna element in a state of being pressed from the direction intersecting the axis of the antenna element, and the antenna element is sandwiched from a plurality of positions on both sides. In this state, the antenna element is fixed to the hollow tubular boom.
[0011]
Preferably, in the inside of definitive to the hollow tubular boom, the position where the sides of the of stripping predetermined position of the antenna element in cross-sectional shape, let a rib extending in the axial direction of the boom of each said hollow tube,
Original portion of each of the cross-sectional shape of the ribs located on either side thereof is fixed integrally with the tube wall of the inner surface of each boom, the distal end side of each of the ribs of the cross-sectional shape of said respective is a free end The free end sides of the ribs face the antenna elements placed at the planned placement positions, and the direction from the base side to the tip side of each rib is the antenna placed at the planned placement position. Set in the direction intersecting the element axis,
Further, the hollow tubular boom is provided with a plurality of two pairs of tube wall holes for penetrating the hollow tubular antenna element in a direction perpendicular to the axis of the boom at an appropriate interval in the axial direction. Every
Next, the hollow tubular antenna element is passed through each of the two pairs of tube wall holes, and the antenna element is placed at the planned location,
The outer wall of the hollow tubular boom is brought closer to each other by applying pressure to the outer wall of the hollow tubular boom from the outer periphery on both sides of the position where the antenna element is present in the hollow tubular boom, and the outer walls of the hollow tubular boom are brought closer to each other. it allows close to each other based on portions of the respective in ribs located on both sides of the antenna element of the tube, pressing the free end of each rib of the boom tube to the tube wall of the respective said hollow tubular antenna elements, the antenna elements As long as it is held between the free ends of the ribs on both sides .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, drawings showing embodiments of the present invention will be described. 1 to 3, reference numeral 1 denotes a known antenna used for transmission / reception of an arbitrary communication signal (including an image signal) such as a VHF to UHF wave. 2, a cross section formed of aluminum or plastically deformable hard material or the like round hollow tubular boom (or polygonal shape including hexagonal, as shown in FIG. 4) (of the peripheral wall as shown as well known This is a pipe-shaped boom whose cross-sectional shape is closed) , and is usually mounted above a mast 1a established on a building and arranged in the direction of transmission / reception of communication.
In the direction of the axis of the boom 2, as shown in FIG. 1, the director 10, the radiator 8, and the reflector 9 are provided at positions spaced at appropriate intervals in terms of high frequency.
The boom 2 provided with the director 10 is provided with a plurality of through holes 4a at appropriate intervals in a direction perpendicular to the axis of the boom 2.
The through holes 4a provided in the tube wall 4 of the hollow boom 2 form two pairs of tube wall holes 4a for allowing the hollow tubular antenna element 6 to penetrate in a direction perpendicular to the axis of the boom.
[0013]
The hollow boom 2 shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4 has an antenna element 6 in the middle in the cross-sectional shape (transverse cross section as shown in FIG. 2B) as shown. Ribs 3 extending in the axial direction of the boom 2 (left and right direction in the longitudinal section of FIG. 2A) are provided at both side positions of the lever.
The base side 3c in the cross-sectional shape of the ribs 3 is formed integrally with the tube wall 4 by an integral material and is in a fixed state.
The direction from the base part side 3c to the free end side 3b in the rib intersects with the axis of the antenna element 6 placed at the planned location as shown in FIG. 2B and FIG. The traveling destination is directed to the outer peripheral surface 7 of the antenna element 6.
The tip side 3b, 3b in the cross-sectional shape of each rib 3 is configured as a free end. Therefore, as shown in FIGS. 2, 3, and 4, a portion 6 a of the antenna element 6 exists between the upper and lower ribs 3 and 3 inside the boom 2.
[0014]
Next, FIG. 2 shows a state before the deformation of the boom tube wall. The cross-sectional shape of the boom 2 is slightly elliptical, and the short diameter D2 is slightly smaller than the long diameter D1. . In this state, the length S1 of the rib 3 is set to a length sufficient to reach the outer peripheral surface of the antenna element 6.
Therefore, the dimension S2 between the leading ends 3b and 3b of the opposing ribs 3 and 3 is smaller than the diameter D5 of the antenna element 6. In addition, in such a situation, in the portion overlapping the outer peripheral surface 7 of the antenna element 6 on the tip side 3b, 3b of the rib 3, 3, the tip side 3b, 3b of the rib 3 as shown in FIG. Is partly removed along the outer peripheral surface 7 of the antenna element 6 in a circular arc shape. As a means for the deletion, for example, when the two pairs of tube wall holes 4a, 4a are formed by drilling, the tip portion is easily drilled together.
In addition, although the cross-sectional shape of the boom 2 in FIG. 2 was formed in a slightly elliptical shape, it may be formed in a perfect circle. However, in the finished state, it becomes an ellipse whose major axis side is located in the left-right direction. Further, the present invention can be implemented even if the length S1 of the rib 3 is slightly shortened to reach the outer peripheral surface 7 of the antenna element 6 or not. However, in the finished state, the surface in contact with the outer peripheral surface 7 of the antenna element 6 on the front end side 3b of the rib 3 is slightly reduced, but there is no problem in practical use.
[0015]
Next, means for fixing the antenna element 6 attached to the boom 2 will be described.
First, the above-mentioned two pairs of tube wall holes 4a, 4a,... 4a are formed by drilling the tube wall 4 of the boom 2 shown in FIG. At that time, as described above, it is preferable that arc-shaped concave portions corresponding to the outer peripheral surface 7 of the antenna element 6 are formed together in a part of the rib 3 facing the antenna element 6 on the tip side 3b, 3b.
Next, a plurality of antenna elements 6 are passed through the two pairs of tube wall holes 4a, 4a,... 4a as shown in FIGS.
In this case, if necessary end surface processing such as blocking both ends of the antenna element 6 is efficiently performed in advance in a place where the work is easy to perform, there is an effect that the subsequent processing is simplified (not complicated).
[0016]
Next, a force is applied to the outer peripheral surface 4 of the boom 2 having a cross-sectional shape shown in FIG. 2 (B) by any means from above and below, and the shape of the tube wall 4 of the boom 2 appears in FIG. To be deformed.
As a means for this deformation, for example, as shown by a two-dot chain line in FIG. 2 (B), a pair of press dies 11, 11 are arranged in a state of facing each other with the boom 2 in the middle. Arc-shaped concave portions 12 and 12 corresponding to the outer peripheral shape of the boom 2 to be finished (the finished outer shape 4 of the boom shown in FIG. 3B) are provided on the inner surface of each of the inner surfaces.
When the two upper and lower press dies 11, 11 are brought close to each other in the state of FIG. 2 (B), the major axis D1 in FIG. 2 (C) is compressed and contracted as the major axis D3 in FIG. 3 (C), and the minor axis D2 is reduced. As shown by the minor axis D4 in FIG. 3C, the antenna element 6 extends in the axial direction. As a result, the shape of the tube wall 4 of the boom 2 is deformed from an elliptical shape to a substantially perfect circular shape as shown in FIG.
[0017]
Furthermore, when the two upper and lower press dies 11, 11 are brought close to each other as described above, the four ribs 3, 3, 3, 3 are all tubed in the portion 6a of the antenna element 6 inside the tube wall 4 of the boom 2. It is pushed toward the wall 7. When the mutually opposing portions of the tube wall 4 of the boom 2 are pushed together with the four ribs 3, 3, 3, 3, as shown in FIGS. The outer peripheral surface 7 of the antenna element portion 6a is recessed into an arc shape corresponding to the shape of the contact portion of the tip 3b of the rib 3. As a result, the cross-sectional shape of the antenna element becomes an elliptical shape as shown in FIG. 3A, and concave portions 7b having valley portions 7d are formed at four corresponding portions of the antenna element portion 6a.
Further, the tip 3b of the rib 3 is pressed into contact with each trough 7d, and the cross-sectional shape of the antenna element portion 6a is elliptical at the position of the recess 7b. The effect is demonstrated. Further, on both inclined surfaces before and after the recess 7b, the antenna element portion 6a is prevented from moving in the left-right direction in FIG. Thus, the fitting of the tip 3b of the rib 3 and the recess 7b prevents the hollow tubular antenna element 6a from rotating and the antenna element 6 from moving in the longitudinal direction. It will be fixed.
[0018]
If the length in the depth direction of the two upper and lower press dies 11, 11 shown in FIG. 2 (B) is a dimension corresponding to the length of the boom 2, the efficiency of the press work is very good. Become. However, even if it is significantly shorter than that, it can be carried out even if the pressing in the longitudinal direction of the boom 2 is repeated a plurality of times. It is possible to deform the boom 2 by pressing it from above and below by placing pressure rollers on the top and bottom and moving the boom 2 between them in place of the two press dies 11 and 11 that operate vertically. It is.
[0019]
The dimensions of the general boom and antenna element are as follows. In the state before deformation shown in FIG. 2, the outer diameter of the boom (aluminum) 2 is D1: 23 mm, D2: 21 mm, and the thickness of the boom 2 is : Appropriate dimensions are 1.0mm, the inner diameter of the through-hole of the boom tube wall is 8.1mm, the outer diameter of the antenna element (aluminum) is 8mm, and the inner diameter of the antenna element is 7mm.
Next, the dimensional relationship of the ribs 3 is somewhat different depending on the correlation between them and the thickness state of the tube wall of the antenna element. For example, in FIG. The projecting dimension S1 up to 3b is set to 8 mm, S2 between the tips 3b and 3b is set to 7 mm, the thickness at the rib 3 is set to 1.0 mm, and the width L1 between the ribs 3 and 3 is set to 11 mm. .
Next, in the state after deformation shown in FIG. 3, the outer diameter of the boom (aluminum) 2 changes to D3: 22 mm and D4: 22 mm, and becomes a shape close to a perfect circle.
Further, S3 between the tips 3b and 3b is reduced to 6 mm, and the tips 3b and 3b bite into the tube wall of the antenna element by about 0.5 mm to hold the tube wall of the antenna element. Further, as described above, the antenna element portion 6a projects sideways and becomes an elliptical shape as shown in FIG.
However, since the dimensions described above change the size of the boom, the dimensions of the antenna element, and the like depending on the use of the antenna, the dimensions must be changed accordingly.
[0020]
Next, what is shown in FIGS. 4A and 4B shows a state different from the rib 3 in FIG.
(A) shows the example which has arrange | positioned one rib 3, 3 in the center position in the state orthogonal to the antenna element 6 inside the boom 2 reduced in diameter. The technical matters relating to the state change accompanying the processing of the pressurization on the boom 2, the antenna element 6, and the rib 3 shown in (A) are the same as those described with reference to FIGS. Therefore, duplicate description is omitted.
Moreover, what is shown by (B) shows the cross-sectional shape of the boom 2 as an example of the polygon different from the round thing shown by FIG.3 (C). Also in this shape, the cross-sectional shape of the boom 2 is slightly larger in advance (indicated by a two-dot chain line 2d), as in the cases shown in FIGS. 2B, 3C and 4A. After the antenna element 6 is penetrated, a compressive force is applied in the direction of the arrow 15 relatively from both sides of the outside, and the tip 3b of the rib 3 is made to move to the antenna element 6 It is designed so that it can bite into the peripheral wall of the wall, and can exert a detent effect and a retaining effect.
4A and 4B as described above, the direction from the base portion side 3c to the free end side 3b of the rib is the axis of the antenna element 6 placed at the planned placement position. The ribs 3 and 3 extend toward each other toward the central portion 6a of the antenna element 6 in an orthogonal state or in a slightly inclined state. The antenna element 6 is pressed from the side, and the pressing force causes the outer peripheral surface 7 of the portion 6a of the hollow tubular antenna element to be recessed, and the free end 3b of the rib and the concave portion 7b of the outer peripheral surface 7 of the hollow tubular antenna element are fitted. Let This fitting prevents rotation of the hollow tubular antenna element and movement of the antenna element in the longitudinal direction.
In FIG. 4, parts that are considered to have the same or equivalent configuration in function, property, characteristics, or the like as in the case of FIGS. 2 and 3 are given the same reference numerals as those in FIGS. Omitted.
[0021]
【The invention's effect】
In the present invention, in the portion 6a of the antenna element located in the tube of the boom 2 of the hollow tube , the base portion side 3c is located on the tube wall 4 with respect to the position away from the tube wall hole 4a in the tube wall 4 of the boom 2. Since the antenna element 6 is fixed to the boom 2 in a state where the free ends 3b of the ribs 3 that are integrally fixed to each other are brought into contact with each other and the portion 6a of the antenna element is sandwiched from both sides, it is hollow. In the state in which the antenna element 6 is fixed to the boom 2, the fixed portions 7 b and 3 b cannot be seen from the outside, and there is an effect that it is possible to provide an antenna fixed in a beautiful appearance.
[0022]
Moreover, in the present invention, when the antenna is exposed to a storm due to the configuration as described above and the antenna element 6 receives a vibration due to the storm, the above-mentioned fixing portion is the center in the tube of the boom 2. The two hole edges 4b, 4b of the boom 2 are protected by the tube wall 4 in the shifted position, and have the effect of serving as a support for preventing breakage due to the shake of the fixed portion of the antenna element 6.
In the present invention, the overall resonance phenomenon of the antenna element 6 is softened in this way, the antenna element 6 is prevented from being damaged near the hole edges 4b and 4b of the boom tube wall, and the antenna element 6 There is an effect that can increase the life.
[0023]
Further, in the present invention, as described above, in the antenna element portion 6a located in the tube of the boom 2, the base portion side is located on the tube wall 4 with respect to the position away from the tube wall hole 4a in the tube wall 4 of the boom 2. Since the antenna element 6 is fixed to the boom 2 in a state where the free ends 3b of the ribs 3 fixed integrally to 4 are brought into contact with each other and the antenna element portion 6a is sandwiched from both sides, The position of the fixing portion is characterized in that it can be freely selected at an arbitrary position away from the tube wall holes 4a, 4a on both sides by an appropriate dimension in terms of processing accuracy. Thereby, the technical precision which comprises a fixation part may be easy, and there exists an effect which can be comprised easily and efficiently.
[0024]
Further, in the present invention, after the antenna element is passed through the pair of two tube wall holes and then the fixing portion is configured, the base side of the rib 3 is integrated with the tube wall 4 in advance. The tip 3b of the rib 3 is configured as a free end, and the direction from the base 3c to the tip 3b of the rib 3 is the axis of the antenna element 6 placed at the planned location. As a result, the outer periphery of the tube wall 4 of the boom is simply deformed even inside the pipe-shaped boom whose cross-sectional shape is closed as shown in the figure. Thus, the free end 3b of the rib can be fitted to the outer peripheral surface 7 of the antenna element by the operation of pressing the free end 3b of the rib 3 in the boom tube against the tube wall 7 of the hollow tubular antenna element. Has innovative features that enable simple processing. The
This is for the tube wall 7 of the antenna elements, in order to abutted the leading end side 3b of the rib 3 boom tube of the hollow tube, the pipe-shaped boom tube wall cross-section is closed The work can be easily fixed from the outside of the peripheral wall of the hollow tube of the hollow tube whose peripheral wall is closed without requiring special consideration such as bending the rib 3 with a special tool. There is an excellent effect.
[0025]
In addition, in the present invention, from the outside of the peripheral wall of the boom of the hollow tube whose peripheral wall is closed, “applying pressure to the outer wall of the hollow tubular boom to bring the outer walls of the hollow tubular boom close to each other. `` Displace the original parts of the ribs located on both sides of the antenna element in the pipe in a direction to approach each other, and bring the free end side of each rib into contact with both sides of the pipe wall of the antenna element '' Because
The mechanical strength of the “outer wall of the hollow tubular boom” is partially weakened by applying pressure to the outer wall of the hollow tubular boom to bring the outer walls of the hollow tubular boom closer to each other. It seems that such a phenomenon does not occur.
That is, the above-mentioned "parts for applying pressure to the outer wall of the hollow tubular boom are respectively provided with ribs extending in the axial direction of the boom", and the bending strength is set to be reinforced. As long as the “outer wall of the hollow tubular boom” is slightly displaced, there is a feature that does not affect the bending strength of the entire boom.
[Brief description of the drawings]
FIG. 1 is a perspective view of an antenna.
2A is a cross-sectional view taken along the line II-II before deformation of the boom tube wall in FIG. 1, FIG. 2B is a cross-sectional view taken along the line III′-III ′ of FIG. (A) IV'-IV 'line sectional drawing of a figure.
3A is a cross-sectional view taken along line II-II in FIG. 1, FIG. 3B is a cross-sectional view taken along line III-III in FIG. 1A, and FIG. 3C is a cross-sectional view taken along line IV-IV in FIG. Sectional drawing.
4 is a cross-sectional view showing an embodiment different from the rib shown in FIG. 3 (C).
FIG. 5 is a drawing for showing an example of a conventional means for bulging a part of an antenna element located inside a boom, and (A) is a longitudinal section showing a state just before bulging processing; Plan view. (B) is a longitudinal cross-sectional view showing a state in which the middle of the inner wall of the boom wall is bulged.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... Boom (arm), 3 ... Rib, 4 ... Boom wall, 4a ... Boom wall hole, 4b ... Boom wall hole Edge, 6 ... Antenna element (waveguide element), 7 ... Tube wall of antenna element, 7a ... Swelling part of antenna element, 7b ... Recessed part of antenna element, 8 ... Radiator , 9 ... reflector, 10 ... director, 11 ... mold, 12 ... inner surface of the mold.

Claims (3)

The wall of the hollow tubular boom, at a suitable distance in the axial direction, a plurality of two pair of tube wall hole in order to penetrate in a direction perpendicular to the antenna elements of the respective hollow tubular axis of the boom A hollow tubular antenna element is passed through each of the two pairs of tube wall holes, and the antenna elements are respectively fixed to the boom.
The antenna element is fixed to the hollow tubular boom.
In the tube of the hollow tubular boom, the antenna element in the cross-sectional shape is provided with ribs extending in the axial direction of the boom at both sides of the antenna element, and the base side in the cross-sectional shape of these ribs is Each of the hollow tubular booms is integrally fixed to the inner surface of the tube wall, the free end side is directed to face the antenna element, and the rib is directed from the base side toward the free end side. direction and have set in a direction crossing the axis of the antenna elements to be placed in the of stripping predetermined position,
The hollow tubular boom is positioned on both sides of the antenna element in the pipe by applying pressure to the outer wall of the hollow tubular boom from the outer periphery on both sides of the position where the antenna element is present in the hollow tubular boom. The bases of the two ribs are displaced in the direction of approaching each other,
The free end side of each rib is brought into contact with both sides of the tube wall of the antenna element in a state of being pressed from the direction intersecting the axis of the antenna element, and the antenna element is sandwiched from both sides. An antenna element is fixed to the hollow tubular boom. The wall of the hollow tubular boom, at a suitable distance in the axial direction, a plurality of two pair of tube wall hole in order to penetrate in a direction perpendicular to the antenna elements of the respective hollow tubular axis of the boom A hollow tubular antenna element is passed through each of the two pairs of tube wall holes, and the antenna elements are respectively fixed to the boom.
The antenna element is fixed to the hollow tubular boom.
In the tube of the hollow tubular boom, a plurality of ribs extending in the axial direction of the boom are provided in parallel with each other at both sides of the antenna element in the cross-sectional shape. The base portion side in the cross-sectional shape is integrally fixed to the inner surface of the tube wall on the side of the hollow tubular tube wall hole, and the free end side is oriented to face the antenna element, respectively. the direction toward the free end side from the base portion side of the rib and have set in a direction crossing the axis of the antenna elements to be placed in the of stripping predetermined position,
The hollow tubular boom is positioned on both sides of the antenna element in the pipe by applying pressure to the outer wall of the hollow tubular boom from the outer periphery on both sides of the position where the antenna element is present in the hollow tubular boom. The bases of the two ribs are displaced in the direction of approaching each other,
The free end side of each rib is brought into contact with both sides of the tube wall of the antenna element in a state of being pressed from the direction intersecting the axis of the antenna element, and the antenna element is sandwiched from a plurality of positions on both sides. In this state, an antenna element is fixed to the hollow tubular boom. In the inside of definitive hollow tubular boom, the position where the sides of the of stripping predetermined position of the antenna element in cross-sectional shape, let a rib extending in the axial direction of the boom of each said hollow tube,
Original portion of each of the cross-sectional shape of the ribs located on either side thereof is fixed integrally with the tube wall of the inner surface of each boom, the distal end side of each of the ribs of the cross-sectional shape of said respective is a free end The free end sides of the ribs face the antenna elements placed at the planned placement positions, and the direction from the base side to the tip side of each rib is the antenna placed at the planned placement position. Set in the direction intersecting the element axis,
Further, the hollow tubular boom is provided with a plurality of two pairs of tube wall holes for penetrating the hollow tubular antenna element in a direction perpendicular to the axis of the boom at an appropriate interval in the axial direction. Every
Next, the hollow tubular antenna element is passed through each of the two pairs of tube wall holes, and the antenna element is placed at the planned location,
The outer wall of the hollow tubular boom is brought closer to each other by applying pressure to the outer wall of the hollow tubular boom from the outer periphery on both sides of the position of the antenna element in the hollow tubular boom, and the outer wall of the hollow tubular boom is brought closer to each other. it allows close to each other based on portions of the respective in ribs located on both sides of the antenna element of the tube, pressing the free end of each rib of the boom tube to the tube wall of the respective said hollow tubular antenna elements, the antenna elements A method for manufacturing an antenna, characterized in that the antenna is sandwiched between the free ends of the ribs on both sides .

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