JP4256686B2 - Antenna manufacturing method and antenna - 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 an appropriate interval in the axial direction of the boom, and a pipe-shaped antenna element is provided with respect to the through holes. The present invention relates to an antenna of a type that is fixed and used in a state in which the is penetrated.
[0002]
[Prior art]
  Conventionally, a plurality of through holes are provided at positions spaced apart from each other in the axial direction of the boom, and each of the plurality of through holes is provided with a pipe shape. An antenna in which these antenna elements are penetrated and these antenna elements are fixed to a boom and a method for manufacturing such an antenna are widely known (for example, see Patent Document 1). In the conventional fixing means, a metal hollow tube made of a plastic material is inserted into the tube of the antenna element, and is positioned around the boom axis, and the rod-shaped jig is inserted into the hollow tube from both sides. By inserting the tip and applying pressure from both sides, the inlet of the hollow tube is deformed in the radial direction, and the deforming action expands the entire circumference of the tube wall inside the boom in the antenna element, thereby penetrating the boom. Means are used to fix the antenna element to the boom by being brought into pressure contact with the inner edge of the hole.
[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, there is one shown in FIG. 8 as means for mechanically expanding the tube wall near the hole edge in the tube wall in the boom in the antenna element without using the consumable (for example, , See Patent Document 2).
[0005]
  In an antenna manufactured by such a known means, when the antenna element 6 is penetrated into the tube of the boom 2 and the antenna element 6 is fixed to the boom 2 at the time of manufacture, the operations of the rod-shaped jigs 14 and 14 are performed. The inclined facing surfaces 15 and 15 at the tips are in the ready state of FIG. 8A, and then the inclined facing surfaces 15 and 15 at the tips of the rod-shaped jigs 14 and 14 are turned into FIG. Advance from both sides to position B). 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]
  An object of the present application is to provide an antenna in which a fixed part cannot be seen from the outside in a state where an antenna element is fixed to a hollow boom, and is fixed in a beautiful appearance. .
  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.
    Another object of the present application is that the antenna element can be passed through the boom and the antenna element can be fixed to the boom, so that the two can be coupled with rough machining accuracy, thereby increasing the machining efficiency. Intend to provide an antenna.
[0008]
  Another object of the present invention is to provide a hollow tubular antenna element portion located in the boom tube, and to the peripheral surface of the antenna element at a position intermediate from the tube wall hole in the tube wall of the boom. When pressing the rib provided in the pipe, the base side of the rib is fixed to the pipe wall integrally in advance, and the side of each rib to be in contact with the pipe wall of the antenna element Is a free end, and in the middle, when the free end side is bent, a groove for facilitating bending is provided so that the rib pressing operation against the antenna element can deform the rib with a light force. Therefore, it is intended to provide an antenna that can improve efficiency.
[0009]
  In addition, even in a configuration in which the rib fixed to the boom is deformed in the boom tube, no force is generated in the direction of the tube wall of the boom so that the tube wall is not adversely affected. It is intended to provide an antenna that can be
  Other objects and advantages will be readily apparent from the drawings and the following description associated therewith.
[0010]
[Means for Solving the Problems]
  In the antenna according to the present invention, a pair of two tubes for allowing hollow antenna elements to pass through in the direction perpendicular to the axis of the boom at an appropriate interval in the axial direction on the tube wall of the hollow boom. While providing multiple wall holes,
  On the inner side of the hollow boom, in the cross-sectional shape of the hollow boom, the width direction is a direction along the longitudinal direction of the antenna element with respect to positions on both sides of the planned location of the antenna element, and , Each of the ribs in a state where the longitudinal direction extends long toward the axial direction of the boom,
  In addition, in the arrangement state of the ribs, the base side in the cross-sectional shape of each rib is fixed integrally to the tube wall of the boom, and the tip side in the cross-sectional shape of each rib is a free end. Between the base portion side and the free end side of the cross-sectional shape of the antenna element when the free end side is bent toward the position where the antenna element is to be placed, respectively, on the side facing the position where the antenna element is to be placed. Prepare a boom in which grooves for easy bending are formed in the longitudinal direction of the ribs,
  For the boom, a hollow tubular antenna element is passed through each of the two pairs of tube wall holes provided at an appropriate interval in the axial direction,
  Next, the aboveLongitudinal direction extends long toward the boom axis.Apply pressure to the member between the free end side in the cross-sectional shape of each rib and the groove away from the base side,
Leave the state of the member between the respective base portion side and the groove in the cross-sectional shape of each rib,Each in a state where the longitudinal direction extends long toward the axial direction of the boom.Bending the free end side in the cross-sectional shape of the rib from the respective groove portions to the tube wall side of the antenna element,
  Each of the aboveIn the rib whose longitudinal direction extends long toward the axial direction of the boomFree endOf whichOn the tube wall of the hollow tubular antenna elementEach corresponding partRespectivelyOn the pipe wallPress to dent the corresponding outer peripheral surface of the hollow tubular antenna element,the aboveRibbedIn each partWith free end,By fitting the concave portions on the outer peripheral surface of the hollow tubular antenna element, the rotation of the hollow tubular antenna element and the movement of the antenna element in the longitudinal direction are prevented.
[0011]
  Also preferably,
    The tube wall of the hollow boom is provided with a plurality of two pairs of tube wall holes for penetrating the hollow tubular antenna elements in the direction perpendicular to the axis of the boom at an appropriate interval in the axial direction. With
  On the inner side of the hollow boom, in the cross-sectional shape of the hollow boom, the width direction is a direction along the longitudinal direction of the antenna element with respect to the position on the side of the planned location of the antenna element, and , Arranging a rib whose longitudinal direction extends long toward the axial direction of the boom,
  Moreover, in the arrangement state of each rib, the base side in the cross-sectional shape of each rib is integrally fixed to the tube wall of the boom, and the tip side in the cross-sectional shape of each rib is a free end. When the free end side is bent toward the position where the antenna element is to be placed, between the base portion side and the free end side in the cross-sectional shape of the rib of the antenna element and facing the position where the antenna element is to be placed In addition, the grooves for facilitating the bending are each formed in a long length in the longitudinal direction of the ribs,
  With respect to the boom, in a state where hollow antenna elements are respectively penetrated through the two pairs of tube wall holes provided at an appropriate interval in the axial direction,
  the aboveLongitudinal direction extends long toward the boom axis.Pressure is applied to the members between the free end side in the cross-sectional shape of each rib and the groove away from the base side, and the base side and the groove in the cross-sectional shape of each rib Leaving the state of the member between and aboveEach in a state where the longitudinal direction extends long toward the axial direction of the boom.Bending the free end side in the cross-sectional shape of the rib from the respective groove portions to the tube wall side of the antenna element,
  Each of the aboveIn the rib whose longitudinal direction extends long toward the axial direction of the boomFree endOf whichOn the tube wall of the hollow tubular antenna elementEach corresponding partRespectivelyOn the pipe wallPushingTheCorresponding outer peripheral surface of the hollow tubular antenna elementTheEach recessedShi,the aboveRibbedIn each partWith free end,By fitting the recesses on the outer peripheral surface of the hollow tubular antenna element, rotation of the hollow tubular antenna element and movement of the antenna element in the longitudinal direction are prevented.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, drawings showing embodiments of the present invention will be described. 1 to 4, 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 is a hollow boom having a round cross section (or a polygonal shape including a square as shown by a two-dot chain line in FIG. 7) formed of aluminum or a plastically deformable hard material as is well known. It is mounted above the mast 1a established on the building and arranged in the direction of communication transmission / reception.
  In the axial direction 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 includes a plurality of through holes 4a at appropriate intervals in a direction orthogonal 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]
  A rib 3 extending in the axial direction of the boom 2 is provided on the inner side of the hollow boom 2 shown in FIGS. 1, 2, 3, 4, and 5.
  The base part side 3c in the cross-sectional shape of the ribs 3 is formed integrally with the tube wall 4 to be in a fixed state, and the tip side 3b in the cross-sectional shape of each rib 3 is a pipe (boom 2) manufacturing. In the stage, as shown by the one-dot chain line in FIG. 3 and FIG. 4 (B), it extends horizontally and is configured at the free end. Accordingly, in FIG. 3, there are hollow portions 2 a in the middle of the upper and lower ribs 3 and 3, and hollow portions 2 b and 2 b on the upper and lower sides of the upper and lower ribs 3 and 3. It will be.
[0014]
  A cylindrical antenna element 6 is inserted into the hollow portion 2a, and after inserting the cylindrical antenna element 6, the four tips 3b at the position of the one-dot chain line in FIG. 3 are bent to the solid line position in the figure. As shown in the drawing, the outer peripheral surface of the antenna element portion 6a is recessed. Thereby, the recessed part 7b provided with the trough part 7d parallel to the axial center of the boom 2 and flat is formed in the four corresponding parts of the part 6a of the antenna element.
  Further, the tip 3b is in pressure contact with each trough 7d to prevent rotation of the antenna element portion 6a. Further, both inclined surfaces of the recess 7b are prevented from moving in the left-right direction in FIG. 3 of the antenna element portion 6a. 3a is a single (or multiple) groove provided at the center of the rib 3, which is formed long in the axial direction (longitudinal direction of the rib 3), and is bent when the tip 3b is bent in the direction of the arrow 26. It has been made easier.
[0015]
The hollow portions 2b and 2b in the boom 2 are spaces for allowing a later-described pressing die 20 to pass therethrough. By passing the pressing die 20, each tip 3b can be bent in the direction of the arrow 26 and pressed against the antenna element portion 6a. The thickness 4c between the ribs 3 and 3 of the tube wall 4 of the boom 2 is set as shown in the drawing. By increasing the thickness of the thick portion 4c, the surface facing the outer peripheral surface of the antenna element 6 becomes wider, and the area for holding the antenna element 6 increases. Therefore, when the rib 3 is pressed, there is an effect that it is difficult to cause distortion on the outer periphery of the antenna element 6 and that the antenna element 6 can be stably held. Further, due to the presence of the thick part 4c, it is possible to prevent the distortion of the tube wall 4 when the tip 3b is bent.
  When the rib 3 is disposed inside the boom 2 as described above, the strength of the boom 2 against bending increases, which is effective in reducing the size of the boom 2 and reducing the size.
  In this way, the boom 2 having the ribs 3 therein is manufactured by applying an extrusion method using male and female dies as is generally known.
[0016]
  Next, the stamping die 20 shown in FIG. 6 will be described. The outer shape of the die 20 is a shape as shown in FIG. 6 and is formed of a hard material such as a metal material.
  As can be understood from the side and sectional views of (A), (B), (C), and (D) in FIG. 6, the cross-sectional shape of the die 20 passes through the hollow portions 2b and 2b on both sides in the tube of the boom 2. The correspondence is determined in consideration of the cross-sectional shape there.
  The outer surface 21 of the pressing die 20 corresponds to the arc shape of the inner peripheral surface of the boom 2 as an overall feeling, and has a corresponding cross-sectional shape that enables pressure contact therewith.
  In the cross-sectional shape of the die 20, 20b indicates a leading portion formed relatively small so that it can be easily inserted into the hollow portion 2b, and 20c indicates a rib tip 3b indicated by a one-dot chain line in FIG. A preliminary bent portion having an inwardly bent portion 22a as shown in FIG. 6C is shown in order to be bent slightly toward the trough 7b side of the antenna element and prepare for the next main bending. As shown by the solid line in FIGS. 3 and 4, the end 20b of the rib is finally bent at the trough 7b of the antenna element and brought into contact with the formed trough 7b. This curved part having an inward pressing part 22b for abutting against the rib is shown.
In the description of the cross-sectional shape of the pressing die 20, it has been described in a fragmentary manner using the side views and cross-sectional views of (A), (B), (C), and (D) in FIG. The slopes 22a and 22b are continuous so that the third bending operation is sequentially performed from FIG. 6B to FIG. 6D. In FIG. 6, 22d on the lower surface 22 indicates a concave relief portion. Reference numeral 22c denotes an auxiliary pressing portion. When the hollow portion 2b is allowed to pass through in the state shown in FIG. 4, the lower pressing portion 22c proceeds while being pressed against the bulging portion 7a. By doing so, the tip 3b of the rib can press the recess 7b with a light force. However, depending on the material of the tip 3b, the lower surface 22c may not be in contact with the bulging portion 7a.
[0017]
  As shown in FIGS. 5 and 6, an operating member 25 is detachably attached to the rear end of the pressing die 20 in an integrated manner. This member 25 is a hard rod-like member, and its length is set to a length sufficient to allow the pressing die 20 to be advanced and retracted in a section where a plurality of antenna elements 6 attached to the boom 2 shown in FIG. is there. As the member 25, a thin wire is integrally attached to the tip of the pressing die 20, the pressing die 20 is drawn into the boom 2 with the wire, and the plurality of antenna elements 6 are made to pass through the passage path 24. It may be used for the work to fix each.
  The number of the pressing dies 20 may be a pair of symmetrical ones as shown in FIG. By inserting these through the passages 2b and 2b at the same time and passing them simultaneously, the ribs 3 are deformed very efficiently by the pressing portions 22a and 22b of the pressing die 20, and a plurality of antenna elements are fixed by the ribs 3 one after another. can do. However, when the number of the pressing dies 20 is one, the plurality of antenna elements 6 are fixed by the rib holes 3 of the boom 2 by passing through the other passage 2b after passing through one passage 2b. But I can still work efficiently.
[0018]
  Next, means for fixing the antenna element 6 attached to the boom 2 will be described.
  First, the antenna element 6 is passed through the tube wall hole 4a of the boom 2 as shown in FIG. 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).
[0019]
  Next, the pressing die 20 shown in FIG. 6 is inserted through the hollow portion 2b. The passage is performed in a state where the upper surface 21 is in contact with the inner peripheral surface of the boom 2. Then, the tip 3b of FIG. 3 is slightly pushed and bent in the direction of the arrow 26 in the vicinity of the inwardly bent portion 22a in FIG. 6 (C), and further, in the vicinity of the pressing portion 22b in FIG. 6 (D). 3, pressure is applied to the member between the tip 3b of the groove 3 and the groove 3a separated from the base portion side 3c, and the tip 3b of FIG. In this case, as shown in FIGS. 3 and 4, the state of the member between the base portion side 3 c and the groove 3 a in the cross-sectional shape of each rib 3 is left as it is, and the cross-sectional shape of the rib 3 is free. The end side 3b is bent from the groove 3a to the tube wall 7 side of the antenna element.
  The positional relationship of the pressing die 20 with respect to the rib 3b in this case is a relative position indicated by a one-dot chain line in FIG. In this way, pressure is applied to the rib 3 to deform a part of the rib 3, thereby pressing the free end 3b of the rib 3 against the tube wall 7a of the hollow tubular antenna element.
  By pressing, the outer peripheral surface 7b of the part 6a of the hollow tubular antenna element is recessed, and both sides are expanded as shown in FIG. 2, and the free end 3b of the rib and the concave portion 7b on the outer peripheral surface of the hollow tubular antenna element are illustrated. Fit like 3 and 4. Although the central portion 7a is slightly narrowed up and down as shown in FIG. 2, it has a retaining effect.
By the above fitting, rotation of the hollow tubular antenna element 6a and movement of the antenna element 6 in the longitudinal direction are prevented.
[0020]
   The dimensions of the general boom and antenna element are as follows. The outer diameter of the boom (aluminum) 2 is 22 mm, the inner diameter of the boom 2 is 20 mm, the inner diameter of the through hole in the boom wall is 8.1 mm, and the antenna element. Appropriate dimensions are (aluminum) outer diameter: 8mm and antenna element inner diameter: 7mm.
  Next, the dimensional relationship among the stamping die 20, the passage 2b, the boom 2, and the rib 3 is somewhat different depending on the correlation of the bending condition associated with the change in the thickness between these members. The total length of 100 mm, the section of the main bending portion 20d is 20 mm, the cross-sectional shape is 7.0 mm in height, and the inclination angle of the pressing portion 22b is 80 °.
  The protruding dimension of the rib 3 to the tip 3b of FIG. 4B is 5.5 mm on the lower surface side, 2.8 mm from the groove 3a to the tip, and the height of the pressed state of the rib 3 of FIG. The inner dimension between ribs positioned at the top and bottom of FIG. 3 is set to 8.5 mm, which is 3.4 mm, the thickness t is 1.0 mm, slightly larger than the antenna element 6.
  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.
[0021]
  Next, what is shown in FIGS. 7A and 7B shows the shape of the rib 3 of the embodiment different from the rib 3 of FIGS.
  (A) shows an embodiment in which the left and right upper and lower ribs 3 and 3 in FIG. 4 are not provided, and only the right ribs 3 and 3 constitute the embodiment of the present invention. It is a thing.
  (B) is a figure which shows the example from which the adhering position of the base part 3c of the rib 3 differs in upper and lower sides, and the ribs 3 and 3 are mutually extended toward the center part, and press the antenna element 6 from the upper and lower sides in the center part. The pressing force causes the outer peripheral surface 7b 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 on the outer peripheral surface of the hollow tubular antenna element are fitted.
  This fitting prevents rotation of the hollow tubular antenna element and movement of the antenna element in the longitudinal direction.
  In FIG. 7, the same reference numerals as those in FIGS. 3 and 4 are given to the portions that are considered to have the same or equivalent configuration as those in FIGS. Omitted. Also, the manufacturing method using the stamping die 20 may be performed in the same way with the inner surface 22 of the stamping die being a corresponding shape.
[0022]
【The invention's effect】
  According to the present invention, in the antenna element portion 6a located in the tube of the boom 2, the base portion side 3c is respectively provided with respect to the recesses 7b and 7b provided at positions away from the tube wall hole 4a in the tube wall 4 of the boom 2. Since the free end 3b of the rib 3 fixed integrally to the tube wall 4 is brought into contact with each other, the portion 6a of the antenna element is fixed.
  In a state where the antenna element 6 is fixed to the hollow boom 2, the fixing portions 7b and 3b cannot be seen from the outside, and there is an effect that an antenna fixed in a beautiful appearance can be provided. .
[0023]
  Moreover, according to 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 fixing portions 7b and 3b are It is located near the center of the pipe and is protected by the pipe wall 4, and the two hole edges 4b and 4b of the boom 2 serve as a column for preventing breakage due to the shake of the fixing portions 7a and 3b of the antenna element 6. effective.
  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.
[0024]
  Further, in the present invention, as can be understood from FIG. 4A, “the width direction of the cross-sectional shape of the rib 3 extends in the direction along the longitudinal direction of the antenna element, and the cross-section of the rib 3 The free end side 3b is bent toward the position where the antenna element is to be placed, on the side between the base portion side 3c and the free end side 3b in the shape and facing the position where the antenna element 6 is to be placed. Sometimes, a groove 3a is formed to make it easier to bend. "
  Therefore, as can be understood from each cross-sectional view, the location of the member to be bent, that is, the “member existing between the free end side 3b of the rib 3 and the groove 3a” is the “rib” described above. 3 ”, which is far from the base portion side 3c”, and is set to “a wide place near the center” in the cross section of the boom 2.
  This means, for example, that “a member between the base 3c of the rib 3 and the groove 3a” is a triangular shape outside the place where the member between the base 3c of the rib 3 and the groove 3a exists. Compared to "Bending the antenna element on the tube wall side"
  Applying pressure to the above-mentioned “member between the free end side 3b of the rib 3 and the groove 3a” that is brought out toward the large and large working space, the free end of the rib Bending side 3b to the tube wall side of the antenna element
  For example, there is an advantage that the processing efficiency can be improved by using a large stamping die 20, and in addition,
  The technical accuracy of the bending process is greatly relaxed and very easy to use, and there is also an effect on the processed surface where the bending work can be performed efficiently.
[0025]
  Furthermore, in the present invention, as can be understood from the respective cross-sectional views, “the width direction of the cross-sectional shape of the rib 3 extends in the direction along the longitudinal direction of the antenna element, and the cross-sectional shape of the rib 3 Between the base portion side 3c and the free end side 3b, a groove 3a is formed to facilitate bending when the free end side 3b is bent toward the side where the antenna element is to be placed. "
    Accordingly, in the operation of bending the free end side 3b of the rib 3 toward the tube wall 7 side of the antenna element, “a member between the base portion side 3c of the rib 3 integrated with the boom tube wall 4 and the groove 3a”. Applying a light pressure to the “member between the free end side 3b of the rib 3 and the groove 3a away from the base side 3c” in the take-out state ” There is a feature that the free end side 3b of the rib can be bent to the tube wall side of the antenna element.
  As a matter of course, the force required to bend the tip side 3b in the cross section of the rib 3 is a relatively light force regardless of the state in which the base side 3c of the rib 3 is fixed to the boom tube wall 4. The bending process can be performed with this, and the effect of increasing the accuracy of the bending process and improving the work efficiency can be obtained.
[0026]
  Further, in the present invention, as can be understood from each of the cross-sectional views, “the free end side 3b is placed between the base portion side 3c and the free end side 3b in the cross-sectional shape of the rib 3 and the antenna element is placed. A groove 3a is formed to make it easier to bend when bending toward the planned position. "
    Therefore, in the operation of bending the free end side 3b of the rib 3 to the tube wall 7 side of the antenna element, the force applied to the free end side 3b is partially blocked at the location of the “groove 3a for easy bending”. Thus, it is difficult to apply a large bending force to the “member between the base portion side 3c and the groove 3a” of the rib 3.
  This is because even when a pressure is applied to the free end side 3b of the rib 3 and bending to the tube wall 7 side of the antenna element is performed, distortion (an irregular shape) with respect to the tube wall hole 4a in the tube wall 4 of the boom 2 is achieved. There is no need to worry about distorting the pipe wall hole 4a and introducing rainwater into the pipe of the boom 2 or damaging the outer periphery of the antenna element 6 at the hole edges 4b and 4b of the boom pipe wall 4. There is an effect that it can be prevented in advance and the life of the antenna element 6 can be increased.
[0027]
   Further, the present invention provides the base side of the rib 3 in a state where the longitudinal direction extends long in the axial direction of the boom 2. 3c And groove 3a The free end side of the rib 3 leaving the state of the member between 3b The groove 3a The free end of the rib 3 in a state in which the longitudinal direction extends long in the axial direction of the boom 2 by being bent toward the tube wall 7 side of the antenna element 6 from this portion 3b Among these, each part corresponding to the tube wall 7 of the hollow tubular antenna element 6 3b Is pressed against the tube wall 7 so that the corresponding outer peripheral surface of the hollow tubular antenna element 6 is recessed, and the free end of the rib 3 is 3b And a recess in the outer peripheral surface 7 of the hollow tubular antenna element 6 7b And so on,
   No need to damage the tube wall 4 of the boom 2There is an effect that can be used as a boom.
  The base side of the above-mentioned "rib 3 in which the longitudinal direction extends long toward the axial direction of the boom 2" 3c And groove 3a Therefore, the tube wall 4 in the boom 2 is reinforced from the inside, and the bending strength of the tube wall 4 of the boom 2 is increased as described above. It is effective in reducing the size of 2 or reducing the thickness to lighten it.
  In addition, “the free end side of the rib 3 3b The groove 3a Bend toward the tube wall 7 side of the antenna element 6 from the portion of 3b The force applied to the groove 3a Shut off at the base side 3c Since no large force is applied to the boom 2, the tube wall 4 of the boom 2 is thin and weak, so that the tube wall 4 is not damaged.
  Furthermore, the free end side of “the rib 3 whose longitudinal direction extends long in the axial direction of the boom 2”. 3b The groove 3a As can be understood from FIG. 2, the bent state of the rib 3 toward the tube wall 7 side of the antenna element 6 is the bent free end side of the rib 3. 3b These members are continuous in a series toward the axial direction of the boom 2.
  Naturally, this is because the rib 3 has a free end side from the tube wall 7 side of the antenna element 6. 3b Even if a local reaction force acts on a part of the antenna element, the "rib 3 in a state where the longitudinal direction extends long in the axial direction of the boom 2" receives and withstands this, and the antenna element is fixed. Will be maintained.
[Brief description of the drawings]
FIG. 1 is a perspective view of an antenna.
FIG. 2 is a cross-sectional view taken along line II-II in FIG.
FIG. 3 is a cross-sectional view taken along line III-III in FIG.
4A is a cross-sectional view taken along line IV-IV in FIG. 1, and FIG. 4B is a partially enlarged view showing a relationship between a rib 3 on the upper right side of FIG.
FIG. 5 is a partially broken perspective view at a stage where an antenna element is passed through the boom and a perspective view showing a relationship between the pressing dies 20 and 20 that pass through the internal passage of the boom.
6A is a side view of the mold 20, FIG. 6B is a cross-sectional view taken along the line V-V, FIG. 6C is a cross-sectional view taken along the line VI-VI, and FIG.
7A and 7B are cross-sectional views showing an embodiment different from the rib shown in FIG.
FIG. 8 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 ... Tube wall, 4a ... Tube wall hole, 4b ... Tube wall hole edge, 6 ... Antenna element (waveguide element), 7 ... tube wall, 7a ... bulge, 7b ... recess, 8 ... radiator, 9 ... reflector, 10 ... waveguide , 20 ... pressing mold, 21 ... outer surface, 22 ... inner surface, 25 ... operating member.

Claims (2)

The tube wall of the hollow boom is provided with a plurality of two pairs of tube wall holes for penetrating the hollow tubular antenna elements in the direction perpendicular to the axis of the boom at an appropriate interval in the axial direction. With
On the inner side of the hollow boom, in the cross-sectional shape of the hollow boom, the width direction is a direction along the longitudinal direction of the antenna element with respect to positions on both sides of the planned location of the antenna element, and , Each of the ribs in a state where the longitudinal direction extends long toward the axial direction of the boom,
In addition, in the arrangement state of the ribs, the base side in the cross-sectional shape of each rib is fixed integrally to the tube wall of the boom, and the tip side in the cross-sectional shape of each rib is a free end. Between the base portion side and the free end side of the cross-sectional shape of the antenna element when the free end side is bent toward the position where the antenna element is to be placed, respectively, on the side facing the position where the antenna element is to be placed. Prepare a boom in which grooves for easy bending are formed in the longitudinal direction of the ribs,
For the boom, a hollow tubular antenna element is passed through each of the two pairs of tube wall holes provided at an appropriate interval in the axial direction,
Next, pressure is applied to a member between the free end side in the cross-sectional shape of each rib in a state in which the longitudinal direction extends long in the axial direction of the boom and the groove separated from the base side. And
The cross-sectional shape of each rib in a state in which the longitudinal direction extends long toward the axial direction of the boom , leaving the state of the member between the base portion side and the groove in the cross-sectional shape of each rib. Bending the free end side in the above-mentioned respective groove portions to the tube wall side of the antenna element,
Of the free ends of the ribs in which the respective longitudinal directions extend long in the axial direction of the boom, the respective portions corresponding to the tube walls of the hollow tubular antenna elements are pressed against the tube walls, respectively. Hekomase the corresponding outer peripheral surface of the tubular antenna elements, and the free end of each portion of the rib, by a recess respectively fitted fit on the outer peripheral surface of the hollow tubular antenna element, and the rotation of the hollow tubular antenna elements A method for manufacturing an antenna, wherein the antenna element is prevented from moving in the longitudinal direction. The tube wall of the hollow boom is provided with a plurality of two pairs of tube wall holes for penetrating the hollow tubular antenna elements in the direction perpendicular to the axis of the boom at an appropriate interval in the axial direction. With
On the inner side of the hollow boom, in the cross-sectional shape of the hollow boom, the width direction is a direction along the longitudinal direction of the antenna element with respect to the position on the side of the planned location of the antenna element, and , Arranging a rib whose longitudinal direction extends long toward the axial direction of the boom,
Moreover, in the arrangement state of each rib, the base side in the cross-sectional shape of each rib is integrally fixed to the tube wall of the boom, and the tip side in the cross-sectional shape of each rib is a free end. When the free end side is bent toward the position where the antenna element is to be placed, between the base portion side and the free end side in the cross-sectional shape of the rib of the antenna element and facing the position where the antenna element is to be placed In addition, the grooves for facilitating the bending are each formed in a long length in the longitudinal direction of the ribs,
With respect to the boom, in a state where hollow antenna elements are respectively penetrated through the two pairs of tube wall holes provided at an appropriate interval in the axial direction,
Pressure is applied to each member between the free end side in the cross-sectional shape of each rib in a state where the longitudinal direction extends in the axial direction of the boom and the groove apart from the base side. The cross-section of each rib in a state in which the longitudinal direction extends long in the axial direction of the boom , leaving the state of the member between the respective base portion side and the groove in the cross-sectional shape of each rib Bend the free end side of the shape from the respective groove portions to the tube wall side of the antenna element,
Among longitudinal said respective of the free end of the rib in the state extending long toward the axial direction of the boom, the parts corresponding to the tube wall of the hollow tubular antenna element, is pressed against the respective tube wall, hollow the outer peripheral surface of the corresponding tubular antenna elements and recessed respectively, the free end of each portion of the rib, by where the recess in the outer peripheral surface of the hollow tubular antenna elements are fitted, the hollow tubular antenna element times An antenna, wherein movement and movement of the antenna element in the longitudinal direction are prevented.

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