JP3220002B2 - Cylindrical antenna device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna apparatus for transmitting and receiving radio waves, and more particularly, to a metal cylinder having an opening formed in a peripheral wall for allowing the transmission and reception of radio waves, and a metal cylinder which is spaced apart from the cylinder in the axial direction. An electronic device having first and second end plates forming a hollow space communicating with the opening in cooperation with the inner surface of the cylinder, wherein the first end plate is connected to a radio signal to be transmitted and received. TECHNICAL FIELD The present invention relates to a tubular antenna device provided with a plug for communicating with the antenna.

[0002]

2. Description of the Related Art In a conventional cylindrical antenna device, first and second end plates are fixed to the inner surface of a cylindrical body using soldering when forming a hollow space through which radio waves propagate in the hollow of a metallic cylindrical body. I was On both the front and back surfaces of the first and second end plates, soldering was performed over the entire periphery of the end plate, and the gap between the end plate and the inner surface of the cylinder was completely closed.

[0003]

In the conventional cylindrical antenna device, the first and second end plates are formed on both the front and back surfaces.
Since the entire periphery of the end plate is soldered, the first and second end plates are thermally deformed at the time of soldering, or the solder rises, so that the dimensional accuracy of the hollow space is deteriorated. In some cases, the accuracy of the radio wave propagation characteristics at the time may decrease.

[0004] The present invention has been made in view of the above circumstances, and has as its object to provide a cylindrical antenna device capable of improving the dimensional accuracy of a hollow space.

[0005]

According to a first aspect of the present invention, there is provided a metal cylinder having an opening formed in a peripheral wall for permitting a radio wave to enter and exit, a metal cylinder having an opening in an axial direction of the cylinder. A first end plate and a second end plate, which are spaced apart from each other and cooperate with the inner surface of the cylinder to form a hollow space communicating with the opening;
An end plate is provided with a connector for transmitting and receiving radio signals to be transmitted / received to / from an electronic device connected thereto. In the tubular antenna device, the first and second antennas are formed on the inner surface of the cylinder.
A cylindrical antenna device is provided, comprising a pair of annular steps for respectively receiving end plates, wherein the first and second end plates are press-fitted into a cylindrical body and abut against the annular steps.

According to a second aspect of the present invention, in addition to the features of the first aspect, the plug is disposed inside the outer body fixed to the first end plate and transmits a radio signal. And an insulator disposed between the inner conductor and the outer body to insulate them, and the outer body is soldered to the first end plate.

According to a third aspect of the present invention, in addition to the features of the first or second aspect, an uneven fitting mechanism is provided between a peripheral edge of the first end plate and the inner surface of the cylinder. Is done.

According to a fourth aspect of the present invention, in addition to the features of the first aspect, the plug is provided with an outer body fixed to the first end plate, and a radio signal transmitted through the outer body. A linear inner conductor to be transmitted; and an insulator disposed between the inner conductor and the outer body to insulate them from each other. The outer body has a plug formed on the first end plate of an arbitrary size. It is characterized in that a contact plate is formed for closing the receiving opening and allowing the inner conductor and the insulator to face the hollow space.

According to a fifth aspect of the present invention, in addition to the features of the first aspect, the plug is provided with an outer body fixed to the first end plate, and a radio signal transmitted through the outer body. It is provided with a linear inner conductor to be transmitted, and an insulator disposed between the inner conductor and the outer body to insulate both, and the insulator is slidably inserted into the outer body surface inside the outer body. Is done.

According to a sixth aspect of the present invention, in addition to the features of the first aspect, the plug is provided with an outer body fixed to the first end plate and a radio signal transmitted through the outer body. A linear inner conductor to be transmitted; and an insulator disposed between the inner conductor and the outer body to insulate the inner conductor from each other. The outer body is press-fitted into a plug receiving opening formed in the first end plate. A boss is provided, and a V-shaped caulking is provided between the periphery of the boss and the plug receiving opening.

According to a seventh aspect of the present invention, in addition to the features of the first aspect, the plug is provided with an outer body fixed to the first end plate and a radio signal transmitted through the outer body. A linear inner conductor to be transmitted, and an insulator disposed between the inner conductor and the outer body to insulate them, and the outer body includes the plug when the plug is fitted to the electronic device. It is characterized in that an operation surface on which a tightening tool for tightening the electronic device operates is formed.

According to an eighth aspect of the present invention, in addition to the features of the first aspect, one end of the cylindrical body is supported by the electronic device through the plug, and the other end of the cylindrical body is connected to the other end. It is characterized in that it is supported by an arbitrary support through an elastic cap to cover.

[0013]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[First Embodiment] FIG. 1 shows the overall configuration of a cylindrical antenna apparatus AN according to a first embodiment of the present invention. The cylindrical antenna device AN includes a main body 10 having a hollow space through which radio waves propagate, and is attached to the main body 10.
And a connector 12 for exchanging radio signals to be transmitted and received with the connected electronic device 11. The attachment of the cylindrical antenna device AN to the electronic device 11 is achieved by screwing or fitting the plug 12 to the support surface 11a of the electronic device 11. The electronic device may be a communication device, a receiver, or another transceiver as long as it transmits and receives radio waves.

The main body 10 of the antenna apparatus AN includes a metal cylindrical body 14 having a plurality of openings 13 formed in a peripheral wall 14a for allowing the passage of radio waves. Referring also to FIG. 2, the hollow space 15 inside the main body 10 is, for example, a first and second end plate 1 made of, for example, metal, which are arranged apart from each other in the axial direction of the cylindrical body 14.
6, 17 and the inner surface of the cylindrical body 14. The hollow space 15 communicates with the outside through a plurality of openings 13.

On the inner surface of the cylindrical body 14, a pair of annular steps 18, 1 for receiving the first and second end plates 16, 17 respectively are provided.
9 is formed. The first and second end plates 16 and 17 are pressed into the cylindrical body 14 until they come into contact with the annular steps 18 and 19. A curling ring groove 20 is formed in the peripheral wall 14a of the cylindrical body 14 adjacent to each of the annular steps 18, 19, and the peripheral edges of the first and second end plates 16, 17 are formed by the curling ring groove 20 and the annular steps 18, 19. Be pinched.

A plug receiving opening 21 for receiving the plug 12 is formed at the center of the first end plate 16 as shown in FIG. A plurality of screw receiving holes 22 are formed so as to surround the plug receiving opening 21.

Referring again to FIG. 2, the plug 12 includes an outer body 23 fixed to the first end plate 16, a linear inner conductor 24 disposed inside the outer body and transmitting a radio signal, And an insulator 25 for filling the gap between the inner conductor 24 and the outer body 23 to establish insulation between the two. The outer body 23 is fixed by a screw 26 received in the screw receiving hole 22 of the first end plate 16.
Is established by The insulator 25 exposed from the outer body 23 of the plug 12 enters the plug receiving opening 21 of the first end plate 16, and the inner conductor 24 protrudes from the tip of the insulator 25. When the cylindrical antenna device AN is connected to the electronic device 11, exchange of a radio signal with the electronic device 11 is established through the inner conductor 24 of the plug 12.

Next, the cylindrical antenna device A according to the first embodiment.
The method of assembling N will be described. First, as shown in FIG.
The outer body 23 of the plug 12 is screwed from the outer surface side of the first end plate 16 with the screw 26 while the insulator 25 of the plug 12 enters the plug receiving opening 21. Subsequently, from the two open ends of the cylindrical body 14, the first and second end plates 16, 1
7 along the inner surface of the cylindrical body 14 and press-fit each end plate 16, 17.
Are brought into contact with the annular steps 18 and 19. At this time, the relationship of D1 / D2> 1 is set between the diameter D1 of the circle drawn by the periphery of the first end plate 16 and the diameter D2 of the circle drawn by the inner surface of the cylindrical body 14, and as a result, First and second end plates 16, 17
Each end plate 1 based on the reaction force of the bending based on the elasticity.
6 and 17 are firmly supported by the cylindrical body 14. The amount of deflection of the end plates 16 and 17 is set to the maximum allowable amount on the frequency characteristics of the radio wave propagating in the antenna device AN. By this press-fitting, the peripheral edges of the end plates 16 and 17 are in close contact with the inner surface of the cylindrical body 14, and no gap is generated between the peripheral edge and the inner surface of the cylindrical body 14. In addition, displacement of the end plates 16 and 17 in the radial direction is prevented.

Subsequently, curling is performed from the outer surface side of the cylindrical body 14 so that the curling ring groove 20 and the annular step 1 are formed.
The first and second end plates 16 and 17 are sandwiched between the first and second end plates 8 and 19, respectively. By such pinching, each end plate 16, 1
7 is prevented from shifting in the axial direction of the cylindrical body 14.

In particular, since the peripheral edges of the first and second end plates 16 and 17 are formed with sharp edges from the inner surface facing the hollow space 15 to the outer surface facing the outside, it is apparent from FIG. In addition, the curling ring groove 20 is securely connected to the end plate 1.
6 and 17 can be in contact with the periphery. Moreover, since the inner surfaces of the end plates 16 and 17 are supported by the annular steps 18 and 19 without soldering, the inner surfaces of the cylindrical body 14 and the end plates 16 and 17 are supported.
Corners 27 having no dimensional deviation due to solder swelling or thermal deformation can be formed between them. As a result, the dimensional accuracy of the hollow space 15 is improved, and the reliability of the radio wave propagation characteristics is improved.

[Second Embodiment] FIG. 5 shows a first end plate 30 of a cylindrical antenna device according to a second embodiment. In the second embodiment, the stopper 12 is screwed to the first end plate 16 in the first embodiment, but as shown in FIG.
It is characterized in that the peripheral edge of the outer body 23 of the plug 12 is soldered 31 over the entire circumference. According to such soldering, the first end plate 16 is reinforced by the integral connection of the outer body 23,
As a result, an unnecessary gap around the plug 12 can be closed, and the performance as a high-frequency line is improved. In addition, the elastic force of the first end plate 16 can be increased by increasing the section modulus.

At this time, as shown in FIGS. 6 and 7, an uneven fitting mechanism may be provided between the peripheral edge of the first end plate 30 and the inner surface of the cylindrical body 14. The projection / recess fitting mechanism includes a projection 32 formed on the peripheral edge of the first end plate 30.
And a concave groove 33 with which the projection 32 engages when the first end plate 16 contacts the annular step 18. By the function of the concave-convex fitting mechanism, the cylindrical antenna device A
N by applying a force to the main body 10 to connect the plug 12 to the electronic device 11
Even when the first end plate 30 is fitted,
In addition, rotation occurring between the inner surfaces of the cylindrical body 14 can be reliably prevented.

The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[Third Embodiment] FIG. 8 shows a first end plate 40 of a cylindrical antenna device according to a third embodiment. In the third embodiment, the outer body 42 of the plug 41 is provided with a contact plate 45 that does not change the diameter of the peripheral edge even when the shape of the insulator 43 or the linear inner conductor 44 changes. On the other hand, the first end plate 40 has a plug receiving opening 46 that is closed by the contact plate 45 when the peripheral edge of the contact plate 45 is overlapped. The diameter of the plug receiving opening 46 is
The overlap margin between the surface of the peripheral first end plate 40 and the peripheral edge of the contact plate 45 is set so as to be secured to a predetermined size over the entire circumference. When the contact plate 45 of the plug 41 closes the plug receiving opening 46 by soldering 47, the insulator 43 and the inner conductor 44 face the hollow space 15 of the cylindrical body 14.

According to the third embodiment, even if the shapes and lengths of the insulator 43 and the inner conductor 44 which are press-fitted and fixed to the outer body 42 are changed, the predetermined size of the abutting plate 45 is used. The insulator 43 and the inner conductor 44 can be reliably fixed to the first end plate 40. Even if the shape of the outer body 42 is changed according to the size and shape of the insulator 43, the size of the abutting plate 45 does not change, so the size (length) of the insulator 43 and the inner conductor 44 is changed. By selecting the hollow space 15
The performance can be improved in accordance with the frequency of the radio wave propagating through.

[Fourth Embodiment] FIG. 9 shows a first end plate 50 of a cylindrical antenna device according to a fourth embodiment. The fourth embodiment is characterized in that the insulator 53 of the plug 51 is inserted into the outer body 52 so that the inner surface of the outer body 52 of the plug 51 can slide. According to such a configuration, the insulator 53 is connected to the outer body 52.
Slides in the axial direction of the first end plate 5
The distance L1 between the inner surface of the first end plate 50 and the leading end of the insulator 53, and the distance L2 between the inner surface of the first end plate 50 and the leading end of the insulator 53, ie, the entering length of the insulator 53, are arbitrarily adjusted. be able to. By such adjustment, it is possible to obtain an improvement in performance that matches the frequency of the radio wave propagating in the hollow space 15.

Positioning of the insulator 53 with respect to the outer body 52 is ensured by a set screw 55 which is screwed through the outer body 52. If the set screw is loosened, sliding movement of the insulator 53 is allowed.

[Fifth Embodiment] FIG. 10 shows a first end plate 60 of a cylindrical antenna device according to a fifth embodiment. The fifth embodiment is characterized in that a boss 64 is formed in the outer body 62 of the plug 61 to be pressed into the plug receiving opening 63 of the first end plate 60. Referring also to FIG. 11, after the boss 64 is press-fitted, the relative rotation between the boss 64 and the plug receiving opening 63 is prevented by the V-shaped coking 65 provided between the peripheral edge of the boss 64 and the plug receiving opening 63. Is done. According to such a configuration, it is possible to omit soldering at the time of fixing the plug 61 and avoid thermal deformation due to soldering. As a result, the dimensional accuracy of the hollow space is improved.

Sixth Embodiment FIGS. 12 and 13 show a first end plate 70 of a cylindrical antenna device according to a sixth embodiment. In the sixth embodiment, a nut portion 73 is formed on the outer body 72 of the tangent line 71 as a working surface on which a fastening tool for fastening the plug 71 to the electronic device 11 when the plug 71 is fitted to the electronic device 11. It is characterized by being done. According to this configuration, when the plug 71 is fitted to the electronic device 11, the working force of the tool is not applied to the first end plate 70 or the cylindrical body 14, and as a result, the first end plate 70 or the cylindrical body 14
Can be prevented from being added extra. Therefore, the durability of the cylindrical antenna device AN can be improved.

As shown in FIG. 14, the outer body 72 of the plug 71
Formed on the support surface 11 of the electronic device 11.
It is fitted into or screwed into the receiving hole 75 formed in a. Therefore, the cylindrical body 14 is supported on the support surface 11 a of the electronic device 11 through the plug 71. At this time, as shown in FIG. 14, at the other end of the cylindrical body 14, the cylindrical body 14 is inserted through an elastic cap 76 covering the cylindrical body 14.
May be supported on any supporting surface 77. By supporting the cylindrical body 14 at both ends in this way, the support stability of the cylindrical antenna device AN can be improved.
Further, as shown in FIG. 15, one or more screw holes 78 may be provided in the nut portion 73, and the nut portion 73 may be fixed to the support surface 11a by a screw.

[0032]

As described above, according to the first aspect of the present invention, the press-fitted first and second end plates are received by the annular step, so that there is a gap between the inner surface of the cylinder and the inner surfaces of the first and second end plates. In addition, it is possible to form a corner without dimensional deviation due to solder swelling or thermal deformation. As a result, the dimensional accuracy of the hollow space is improved, and the reliability of the radio wave propagation characteristics is improved.

According to the second aspect of the present invention, since the plug is integrally connected to the first end plate by soldering, the first end plate 16 is reinforced, and as a result, unnecessary portions around the plug are unnecessary. The gap can be closed, and the performance as a high-frequency line is improved. In addition, the elastic force of the first end plate can be increased by increasing the section modulus.

Further, according to the third aspect of the present invention, since the concave / convex fitting mechanism is provided, when a force is applied to the cylinder of the tubular antenna device to fit the plug to the electronic device, the rotational reaction force is applied. Rotation generated between the one end plate and the inner surface of the cylinder can be reliably prevented.

According to the fourth aspect of the present invention, even when the shape and size of the inner conductor and the insulator are changed, the front surface of the first end plate and the contact plate are superimposed around the plug receiving opening. It is possible to reliably secure the margin and to assure the fixing of the plug to the first end plate. As a result, it is possible to obtain an improvement in performance that matches the frequency of the radio wave propagating in the hollow space.

Further, according to the fifth aspect of the invention, by adjusting the length of the inner conductor and the insulator entering the hollow space, it is possible to obtain an improvement in performance that matches the frequency of the radio wave propagating in the hollow space. .

Further, according to the sixth aspect, it is possible to omit the soldering at the time of fixing the plug, and to avoid the thermal deformation due to the soldering. As a result, the dimensional accuracy of the hollow space is improved.

Further, according to the seventh aspect of the invention, when the plug is fitted to the electronic device, the working force of the tool is not applied to the first end plate or the cylindrical body. Can be prevented from being added extra. Therefore,
The durability of the cylindrical antenna device can be improved.

Further, according to the eighth aspect, the support stability of the cylindrical antenna device can be enhanced by supporting the cylindrical body at both ends.

[Brief description of the drawings]

FIG. 1 is a side view showing an overall configuration of a cylindrical antenna device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a plan view of a first end plate.

FIG. 4 is a plan view of a first end plate to which a plug is screwed.

FIG. 5 is a plan view of a first end plate according to a second embodiment.

FIG. 6 is a plan view of a first end plate provided with an uneven fitting mechanism.

FIG. 7 is a cross-sectional view along the axial direction of a cylindrical body provided with an uneven fitting mechanism.

FIG. 8 is a side sectional view of a first end plate according to a third embodiment.

FIG. 9 is a side sectional view of a first end plate according to a fourth embodiment.

FIG. 10 is a side sectional view of a first end plate according to a fifth embodiment.

FIG. 11 is a plan view of a first end plate.

FIG. 12 is a side view of a first end plate according to a sixth embodiment.

FIG. 13 is a plan view of a first end plate.

FIG. 14 is a view showing a support structure of a cylindrical body.

FIG. 15 is a view showing a structure of a nut portion of the plug.

[Explanation of symbols]

12, 41, 51, 61, 71 Connector, 13 opening, 1
4a peripheral wall, 14 cylindrical body as a metal cylindrical body, 15
Hollow space, 16, 30, 40, 50, 60, 70 First
End plate, 17 second end plate, 18, 19 annular step, 23,
42, 52, 62, 72 Outer body, 24, 44, 54 Linear inner conductor, 25, 43, 53 Insulator, 31, 47 Solder solder, 32 Projection of uneven fitting mechanism, 33
Concave groove of concave and convex fitting mechanism, 45 contact plate, 46 plug receiving opening, 64 boss, 65V-shaped caulking, 7
3 Nut part as working surface, 76 elastic cap, 7
7 Support surface as optional support, AN cylindrical antenna device.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-48-53649 (JP, A) JP-A-48-103152 (JP, A) JP-A-5-206704 (JP, A) JP-A 61-106 112402 (JP, A) Actually open 48-45539 (JP, U) Actually open 60-60308 (JP, U) Actually open 57-181111 (JP, U) Actually open 58-172205 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) H01Q 13/20 H01P 7/06 H01Q 13/12

Claims (8)

(57) [Claims] 1. A metal cylinder having an opening formed in a peripheral wall for permitting the passage of radio waves, and a hollow space which is spaced apart from each other in the axial direction of the cylinder and cooperates with the inner surface of the cylinder to communicate with the opening. A first and a second end plate forming a connector, wherein the first end plate is provided with a connector for exchanging radio signals to be transmitted and received with an electronic device connected thereto, A pair of annular steps are formed on the inner surface of the body to receive the first and second end plates, respectively, and the first and second end plates are press-fitted into a cylinder to abut the annular steps. Cylindrical antenna device. 2. The connector according to claim 1, wherein the plug includes an outer body fixed to the first end plate, a linear inner conductor disposed inside the outer body to transmit a radio signal, and between the inner conductor and the outer body. The cylindrical antenna device according to claim 1, further comprising: an insulator disposed and insulating the two, and an outer body is soldered to the first end plate. 3. The cylindrical antenna device according to claim 1, wherein an uneven fitting mechanism is provided between a peripheral edge of the first end plate and an inner surface of the cylindrical body. 4. The plug comprises an outer body fixed to the first end plate, a linear inner conductor disposed inside the outer body to transmit a radio signal, and between the inner conductor and the outer body. And an insulator that is arranged and insulates the inner conductor. The outer body includes an inner conductor and an insulator in the hollow space while closing a plug receiving opening formed in the first end plate at an arbitrary size. The cylindrical antenna device according to claim 1, wherein a contact plate to be faced is formed. 5. The connector according to claim 1, wherein the plug comprises an outer body fixed to the first end plate, a linear inner conductor disposed inside the outer body to transmit a radio signal, and between the inner conductor and the outer body. 2. An insulator which is arranged and insulates them from each other, wherein the insulator is inserted into the outer body so as to slide on the inner surface of the outer body.
3. The cylindrical antenna device according to item 1. 6. The connector according to claim 1, wherein the plug comprises an outer body fixed to the first end plate, a linear inner conductor disposed inside the outer body to transmit a radio signal, and between the inner conductor and the outer body. A boss that is press-fitted into a plug receiving opening formed in the first end plate, and is provided between the peripheral edge of the boss and the plug receiving opening. The cylindrical antenna device according to claim 1, wherein a V-shaped coking is applied. 7. The connector includes an outer body fixed to the first end plate, a linear inner conductor disposed inside the outer body to transmit a radio signal, and between the inner conductor and the outer body. An insulator that is arranged and insulates the two from each other, and the outer body has an operation surface on which a fastening tool for fastening the plug to the electronic device when the plug is fitted to the electronic device acts. The cylindrical antenna device according to claim 1, wherein: 8. One end of the cylindrical body is supported by the electronic device through the plug, and the other end of the cylindrical body is supported by an arbitrary support through an elastic cap covering the other end. The cylindrical antenna device according to claim 1.