JP3668346B2 - Antenna support angle variable mechanism and vehicle rod antenna device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mechanism for variably operating a support angle of a vehicular bar antenna mounted on a roof of an automobile or the like, and a vehicular bar antenna apparatus using this mechanism.
[0002]
[Prior art]
In general, a rod-shaped antenna device for a vehicle mounted on a roof or the like of an automobile has an antenna mounting base provided with a power feeding portion that can be connected to a feeder inside the body wall, that is, the roof of the automobile. The base end portion of the rod-shaped antenna is detachably attached to the antenna mounting base using a screwing means or the like.
[0003]
[Problems to be solved by the invention]
In the above-described conventional vehicle rod antenna device, the antenna mounting base is fixed to the vehicle body wall at a specific angle, and the base end portion of the bar antenna having an element length of, for example, about 150 mm to 400 mm is attached to the antenna mounting base. After all, it is fixed at a specific angle. For this reason, the rod antenna may bend or break if the rod antenna comes into contact with surrounding obstacles during car wash or garage, and a large external force is applied to the rod antenna beyond its elastic limit. There is.
[0004]
Note that a rod-shaped antenna having an element length of about 150 mm has a relatively low possibility of coming into contact with an obstacle because the element length is short. For this reason, even if the garage or the like is inserted with the rod-shaped antenna attached to the vehicle body wall, there is no problem, but since the element length is short, the reception characteristic is relatively poor. A rod-shaped antenna having an element length of about 400 mm in order to maintain good antenna reception characteristics has good reception characteristics, but has a high possibility of coming into contact with an obstacle because of the long element length. For this reason, at the time of entering the garage or the like, the rod-shaped antenna is removed every time, but there is a problem that the operation is very troublesome.
[0005]
In order to solve such a problem, a large external force is applied to the rod-shaped antenna by interposing an antenna support angle variable member in advance at the base end portion of the rod-shaped antenna, so that the antenna is turned down as necessary. 2. Description of the Related Art Conventionally, a vehicular rod antenna device designed so as not to be added is known.
[0006]
However, the variable support angle type vehicular rod-shaped antenna apparatus configured as described above is generally more expensive than the fixed support angle type. Accordingly, not only when such an antenna is newly attached to a vehicle, it is economically expensive to replace the antenna device of the fixed support angle type that is actually used with the above-described variable support angle type rod antenna device for a vehicle. large.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide an antenna support angle variable mechanism capable of transforming an existing fixed support angle vehicle rod antenna device into a variable support angle vehicle rod antenna device, and a vehicle equipped with this mechanism. The object is to provide a rod-shaped antenna device.
[0008]
[Means for Solving the Problems]
  In order to solve the above problems and achieve the object, the present invention uses the following means.
(1) The antenna support angle varying mechanism of the present invention can be detachably inserted between an antenna mounting base mounted on a vehicle body wall and a rod-shaped antenna whose base end is screwed and fixed to the base. ProvidedVariable antenna support anglemechanismInIt comprises a pair of coupling elements that are pivotally supported so that their one ends can be rotated relatively, and the other end of the first coupling element is the antenna mounting base.Screw holesAnd the other end of the second coupling element is,PreviousRecording rod antennaScrew rodAn antenna support angle variable member that is a screw hole that is detachably screwable with respect to the antenna mounting base.To the bodyA fixing nut for fixing the screwed state of the threaded rod to the screw nut,The screw rod at the other end of the first coupling element and the screw rod of the rod-shaped antenna are the same type, and the screw hole at the other end of the second coupling element and the screw hole at the antenna mounting base Is isomorphicIt has become a thing.
(2) The antenna support angle variable mechanism of the present invention can be detachably inserted between an antenna mounting base mounted on a vehicle body wall and a rod-shaped antenna whose base end is screwed and fixed to the base. In the antenna support angle varying mechanism provided as described above, the antenna mounting angle variable mechanism is composed of a pair of coupling elements that are pivotally supported so that their one ends are relatively rotatable, and the other end of the first coupling element is the antenna mounting base. A screw hole that can be detachably screwed with respect to the threaded rod, and the other end portion of the second coupling element can be detachably screwed with respect to the screw hole of the rod-shaped antenna; An antenna support angle variable member, and a fixing nut for fixing the screwed state of the screw rod of the antenna mounting base, and the screw hole at the other end of the first coupling element and the rod shape The screw hole of the antenna is the same type, and the second Threaded rod of the other end portion of the coupling element and the threaded rod of the antenna mounting base has become what is isomorphic.
(3The antenna support angle varying mechanism of the present invention is the above (1).Or (2)The antenna support angle variable mechanism according to claim 1, further comprising a protective cover made of an elastic member placed on an outer periphery of the antenna support angle variable member so as to allow a support angle variable setting operation of the antenna support angle variable member. It is characterized by that.
(4)The rod-shaped antenna device for a vehicle according to the present invention includes an antenna mounting base mounted on a vehicle body wall, a bar-shaped antenna whose base end is detachably fixed to the antenna mounting base, and the bar-shaped antenna and the antenna. An antenna support angle variable mechanism that is detachably inserted between the mounting base and the antenna support angle variable mechanism is a pair of coupling elements that are pivotally supported so that their one end portions are relatively rotatable.Consist ofThe other end of the first coupling element is the antenna mounting base.Screw holesAnd the other end of the second coupling element is,PreviousRecording rod antennaScrew rodAn antenna support angle variable member that is a screw hole that is detachably screwable with respect to the antenna mounting base.To the bodyA fixing nut for fixing the screwed state of the screw rod toThe screw rod of the other end of the first coupling element and the screw rod of the rod-shaped antenna are of the same type, and the screw hole of the other end of the second coupling element and the antenna mounting base The screw hole is the same typeIt is characterized by that.
(5) A vehicular bar antenna device of the present invention includes an antenna mounting base mounted on a vehicle body wall, a bar antenna with a base end detachably fixed to the antenna mounting base, and the bar antenna. And an antenna support angle variable mechanism that is detachably inserted between the antenna mounting base and the antenna support angle variable mechanism. The other end of the first coupling element is a screw hole that can be removably screwed to the screw rod of the antenna mounting base, and the other end of the second coupling element. An antenna support angle variable member that is a screw rod that can be detachably screwed into a screw hole of the rod-shaped antenna, and a fixing nut that fixes a screwed state of the screw rod of the antenna mounting base. , And The screw hole of the other end portion of the first coupling element and the screw hole of the rod-shaped antenna are the same type, and the screw rod of the other end portion of the second coupling element and the screw rod of the antenna mounting base are It is characterized by being the same type.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 is a diagram showing a configuration of a vehicular rod antenna device according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a vehicle body wall (for example, the roof of an automobile), and 2 denotes an antenna mounting hole provided in the vehicle body wall 1. Reference numeral 10 denotes an antenna body, which includes an antenna mounting base 11 and a rod-shaped antenna 12. An antenna support angle variable mechanism 20 described later is inserted between the antenna mounting base 11 and the rod-shaped antenna 12.
[0010]
  The antenna mounting base 11 is mounted in the antenna mounting hole 2. The antenna mounting base 11 is mainly composed of a case integrally formed of, for example, a hard synthetic resin so as to form a hollow cone shape having an inclined bottom surface portion. A power feeding unit 11a is built in the case. The ground side of the power feeding portion 11a is connected to a conductive cylindrical portion 11d (see FIG. 2) that protrudes outward from the inclined bottom surface portion. When the antenna mounting base 11 is assembled to the vehicle body wall 1, the conductive cylindrical portion 11d is introduced into the vehicle body through the antenna mounting hole 2 through insulation. A threaded portion is formed on the outer periphery of the conductive cylindrical portion 11d introduced into the inside of the vehicle body, and a fixing nut 11b is screwed to the threaded portion. Around this fixing nut 11bInA plurality of protrusions are formed, and these protrusions are pressed into contact with the back surface of the vehicle body wall 1 when the fixing nut 11b is tightened. Thus, by tightening the fixing nut 11b, the antenna mounting base 11 is fixed to the vehicle body wall 1.HardThe power supply unit 11a is grounded.
[0011]
The hot side of the power feeding part 11a is connected to a feeder 11c that penetrates the hollow part of the conductive cylindrical part 11d.
The rod-shaped antenna 12 can be detachably attached to the top of the antenna attachment base 11 via an antenna support angle variable mechanism 20 described later or directly. The proximal end portion of the rod-shaped antenna 12 is a large diameter portion 12a, and the distal end portion is a small diameter portion 12b. The large-diameter portion 12a covers the outer periphery of an antenna element (not shown) with a relatively flexible synthetic resin or the like. Therefore, as shown by the two-dot chain lines M and N in the figure, the large diameter portion 12a can be largely bent.
[0012]
The rod-shaped antenna 12 is not directly connected to the antenna support angle variable mechanism 20 and is directly connected at the base end to the top of the antenna mounting base 11 and is 50 to a plane H substantially parallel to the vehicle body wall 1. It is designed and manufactured so that the required antenna function can be exhibited by being supported at an inclination angle θ of about 0 °.
[0013]
The antenna support angle varying mechanism 20 is provided between the top of the antenna mounting base 11 and the base end of the rod-shaped antenna 12 so that it can be inserted as necessary. That is, when the antenna support angle variable mechanism 20 is inserted between the antenna mounting base 11 and the rod-shaped antenna 12, the rod-shaped antenna 12 is removed from the top of the antenna mounting base 11 and the antenna support angle is variable on the top of the antenna mounting base 11. One end of the mechanism 20 is screwed and fixed, and the base end portion of the rod-shaped antenna 12 is screwed and fixed to the other end of the antenna support angle varying mechanism 20. By doing so, the antenna support angle variable mechanism 20 is inserted as shown in the figure, and if necessary, by bending the portion of the antenna support angle variable mechanism 20 by hand, as shown by a two-dot chain line in the figure, The rod-shaped antenna 12 ′ can be laid down to an angle of a plane H substantially parallel to the vehicle body wall 1.
[0014]
FIG. 2 is a diagram showing a specific configuration of the antenna support angle varying mechanism 20. As shown in FIG. 2, the antenna support angle varying mechanism 20 includes an antenna support angle varying member 24 in which one end portions of the first and second coupling elements 21 and 22 are pivotally supported by a shaft support portion 23, and the antenna support angle. The protective cover 30 is made of an elastic member that covers the outer periphery of the variable member 24.
[0015]
FIG. 3 shows the structure of the antenna support angle variable member 24 more specifically. As shown in the figure, the first coupling element 21 includes opposing walls X and Y that are bent in a substantially U shape by a metal material, and a connecting wall that connects the ends of the opposing walls X and Y to each other. A connecting portion 21a made of Z is provided. A screw rod 25 is integrally provided on the bottom surface of the coupling portion 21a.
[0016]
The second coupling element 22 includes a coupling portion 22a formed into a thick plate shape by slightly flattening one end of the metal tube material. A screw hole 26 is provided in the pipe portion 22b connected to the coupling portion 22a. The coupling portion 22a is clamped by opposing walls X and Y of the coupling portion 21a, and is pivotally supported with a predetermined pressure by a shaft support mechanism 27 including a shaft screw 27a, a nut 27b, and a spring washer 27c. Has been.
[0017]
Accordingly, the second coupling element 22 can be rotated by applying a constant turning force from the outside, but when the turning force is released, the angular position is stably held. As shown in FIG. 3B, the rotation range of the second coupling element 22 is limited by the connecting wall Z. That is, the rotation range of the second coupling element 22 is a part of the second coupling element 22 ′ as indicated by a two-dot chain line from an angular position substantially equal to the extension line O of the axial center of the first coupling element 21. Is limited to a range θ up to an angular position (an angular position formed by a plane H that is substantially parallel to the mounting surface of the vehicle body wall 1) at which it contacts the upper edge of the connecting wall Z.
[0018]
Returning to FIG. As described above, the screw rod 25 provided at the other end of the first coupling element 21 among the first and second coupling elements 21 and 22 whose one ends are pivotally supported by the pivotal support 23 is the It is embedded in the top part of the antenna mounting base 11 and can be detachably screwed into the screw hole 16 connected to the hot side of the power feeding part 11a. The screw rod 15 provided at the base end portion of the rod-shaped antenna 12 can be detachably screwed into the screw hole 26 provided at the other end portion of the second coupling element 22. The screw rod 15 and the screw rod 25 have exactly the same dimensions. Therefore, the screw rod 15 can be screwed into the screw hole 16.
[0019]
Reference numeral 28 denotes a fixing nut for fixing the screwed state of the screw rod 25 to the screw hole 16. The fixing nut 28 is pre-threaded with the screw rod 25 when assembled. One end surface of the fixing nut 28 is a concave portion 29 having a conical surface closely fitting with the conical surface of the top surface of the antenna mounting base 11.
[0020]
In a state where the fixing nut 28 is loosened, the screw rod 25 is in a state where it can be screwed into or removed from the screw hole 16 of the antenna mounting base 11. Accordingly, the antenna support angle variable member 24 can be freely attached to and detached from the antenna mounting base 11. When the screw rod 25 is in a predetermined screwing state (including all from the initial screwing state to the screwing end state), when the fixing nut 28 is tightened, the screwing state is fixed as it is. The
[0021]
Therefore, when the first coupling element 21 has a predetermined rotation angle around the axis, that is, the antenna support angle variable member 24 is in a state of being directed in a certain direction, the fixing nut 28 is tightened, so that the antenna support angle The variable member 24, that is, the rod-shaped antenna 12 is in a state in which the support angle can be variably set at a predetermined azimuth angle. Note that the azimuth is usually set in a direction that matches the longitudinal direction of the vehicle.
[0022]
A protective cover 30 is put on the outer periphery of the antenna support angle variable member 24. The protective cover 30 is integrally formed so as to form a substantially cylindrical shape using, for example, a rubber elastic member so as to allow the support angle variable setting operation of the antenna support angle variable member 24. A fitting portion 30 a that fits on the outer periphery of the fixing nut 28 is formed at one end portion of the protective cover 30, and is formed at the proximal end portion of the rod-shaped antenna 12 at the other end portion of the protective cover 30. A fitting portion 30b that fits into the conical concave portion 14 is formed. A plurality of ring-shaped pleats 30c are formed on the peripheral wall of the protective cover 30 so that the deformation can be easily performed with respect to the bending operation.
[0023]
In addition, it is preferable to provide an index indicating the direction in which the antenna support angle variable member 24 changes the support angle, that is, the rotation direction of the rod-shaped antenna 12 around the shaft support 23 on the outer surface of the protective cover 30. As this index, for example, the rod-shaped antenna 12 can be raised and lowered around this portion by bulging both sides of the protective cover 30 covering the shaft support portion 23 in an ear shape and, if necessary, giving a predetermined coloring. An example of indicating that the
[0024]
(Experimental example)
In this experimental example, an experimental product V including the antenna support angle variable mechanism 20 manufactured in the same manner as that illustrated in FIGS. 1 to 3 is compared with a standard product W including no antenna support angle variable mechanism 20. In this example, the S / N sensitivity for the AM wave and the S / N sensitivity for the FM wave were measured, and the difference was evaluated.
[0025]
FIG. 4 shows the “sensitivity measurement result at 10% AM distortion rate”, that is, the above-described experimental product V (3 modes: V1 to V3) and the standard product W are used as comparison samples, and the S / N ratio at the time of AM wave reception. Is about 20 dB. It is a figure which shows the result of having actually measured about the frequency characteristic of G output (sensitivity).
[0026]
FIG. 5 shows the “sensitivity measurement result at FM 3% distortion”, that is, the S / N at the time of FM wave reception using the above-mentioned experimental product V (3 modes: V1 to V3) and the standard product W as comparison samples. S. ratio becomes about 30 dB. It is a figure which shows the result of having actually measured about the frequency characteristic of G output (sensitivity).
[0027]
4 to 5, “standard 400 mm (W)” indicates a case where a genuine mounting rod antenna 12 having a rod length of 400 mm is directly connected to the antenna mounting base 11. “Joint extension (V1)” means that the antenna support angle variable mechanism 20 in an extended state is interposed between the antenna mounting base 11 and the rod-shaped antenna 12 so that the rod-shaped antenna 12 is about 50 ° with respect to the vehicle body wall 1. The case where it supported to the angle is shown. Further, “joint bending (V2)” is a bending of the antenna support angle varying mechanism 20 interposed between the antenna mounting base 11 and the rod-shaped antenna 12 so that the rod-shaped antenna 12 is tilted at an angle substantially parallel to the vehicle body wall 1. The case where it was made to show is shown. Furthermore, “joint water (V3)” indicates the case where the same condition as “joint extension (V1)” is obtained and the antenna support angle variable mechanism 20 is wetted with water to create a wet state. Yes.
[0028]
As can be seen from the actual measurement results in FIG. 4, the sensitivity of the experimental product V is not inferior to that of the standard product W regardless of the mode of use V1 to V3. In particular, in the case of “joint extension (V1)”, It has been found that when the extended antenna support angle varying mechanism 20 is interposed, a high sensitivity that surpasses the standard product W can be obtained.
[0029]
As can be seen from the actual measurement results in FIG. 5, in the relatively high frequency band 84 to 90 MHz, the experimental product V is “joint bent (V2)” with respect to the standard product W, that is, the intervening antenna support angle variable mechanism. In the case of “joint extension (V1)”, “joint water entering (V3)”, that is, when the intervening antenna support angle variable mechanism 20 is extended, the sensitivity is improved. It was found that the sensitivity was reduced compared to the standard product W.
[0030]
For the AM wave, the electric length of the rod-shaped antenna 12 is increased by interposing the antenna support angle varying mechanism 20, and the sensitivity is improved because the shift is made to the direction suitable for the reception wavelength. By interposing the support angle varying mechanism 20, the electrical length of the rod-shaped antenna 12 increases, and conversely shifts in a direction that does not match the reception wavelength. Therefore, it is considered that the sensitivity tends to decrease particularly in a high frequency band. It has been experimentally confirmed that if these measures are taken into consideration and appropriate countermeasures (such as adjustment of the antenna effective length) are taken, it can be used practically without any problem.
[0031]
(Modification)
The rod-shaped antenna for a vehicle shown in the embodiment includes the following modifications.
A plurality of (for example, two) antenna support angle variable mechanisms 20 are connected and used so that the rod-shaped antenna 21 can be bent not only in the vertical direction but also in the horizontal direction.
The screw rod 25 of the first coupling element 21 in the antenna support angle variable member 24 is screwed into a screw hole (not shown) provided in the proximal end portion of the rod-shaped antenna 12, and the second in the antenna support angle variable member 24. The screw hole 26 of the coupling element 22 is screwed with a screw rod (not shown) provided on the top of the antenna mounting base 11.
[0032]
(Summary of feature points in the embodiment)
The feature points of the antenna support angle variable mechanism shown in the embodiment (including modifications) and the rod-shaped antenna device for a vehicle using this mechanism are summarized as follows.
[1] The antenna support angle variable mechanism shown in the embodiment is
The antenna mounting base (11) mounted on the vehicle body wall (1) and the rod-like antenna (12) whose base end is screwed and fixed to the base (11) can be detachably inserted. It is a mechanism provided as follows,
It comprises a pair of coupling elements (21) and (22) that are pivotally supported so that their one end portions are relatively rotatable, and the other end portion of the first coupling element (21) is the antenna mounting base (11). Alternatively, it is a screw rod (25) that can be detachably screwed to either one of the rod-shaped antennas (12), and the other end of the second coupling element (22) is connected to the antenna mounting base ( 11) or the antenna support angle variable member (24) which is a screw hole (26) removably screwable with respect to either the rod-shaped antenna (12),
A fixing nut (28) for fixing the screwed state of the screw rod (25) to either the antenna mounting base (11) or the rod-shaped antenna (12);
The support angle of the rod-shaped antenna (12) can be variably set in a predetermined direction.
[0033]
In the antenna support angle variable mechanism described above, when there is a demand to replace the existing support angle fixed type vehicle rod-shaped antenna device with, for example, a support angle variable vehicle rod-shaped antenna device that can be raised and lowered, the antenna The rod-shaped antenna (12) may be removed from the mounting base (11), and the antenna support angle variable mechanism (20) may be simply interposed between the two. That is, in this way, this vehicle rod antenna device has a variable support angle type vehicle rod antenna that can freely change the support angle of the rod antenna (12) with respect to the antenna mounting base (11). Transform into a device. For this reason, when there is a possibility that the rod-shaped antenna (12) may come into contact with surrounding obstacles when washing the car or putting it in the garage, the antenna support angle variable mechanism (20) is bent and the rod-shaped antenna (12) is turned down. In this state, it is possible to prevent the rod-shaped antenna (12) from being bent or damaged. Thus, by simply interposing an inexpensive antenna support angle variable mechanism (20) into the existing fixed support angle vehicle rod-shaped antenna device, the fixed support angle vehicle rod antenna device can be used for a variable support angle vehicle. It becomes possible to easily transform into a rod-shaped antenna device.
[0034]
Note that even if the antenna support angle variable mechanism (20) is interposed between the antenna mounting base (11) and the rod-shaped antenna (12), the performance of the antenna does not vary so much and can be used with almost no trouble. Confirmed experimentally.
[2] The antenna support angle variable mechanism shown in the embodiment is the antenna support angle variable mechanism (20) according to the above [1],
In order to allow the support angle variable setting operation of the antenna support angle variable member (24), a protective cover (30) made of an elastic member is provided on the outer periphery of the antenna support angle variable member (24). ing.
[0035]
In the above antenna support angle variable mechanism, the antenna support angle variable member (24) is covered from the outside by the protective cover 30, so that the antenna support angle variable member (24) can be prevented from being directly exposed to wind and rain. Can be planned. Further, the appearance is also preferable. Furthermore, since the inside cannot be seen from the outside, the antenna support angle variable member (24) can be prevented from being stolen.
[3] The antenna support angle variable mechanism shown in the embodiment is the antenna support angle variable mechanism (20) according to the above [2],
The protective cover (30) is characterized by having an index indicating the support angle variable direction of the antenna support angle variable member (24).
[0036]
In the above antenna support angle variable mechanism (20), since the direction in which the rod-shaped antenna (12) is raised and lowered can be clearly determined from the outside, there is no possibility of operating the undulation direction by mistake, which is impossible for the rod-shaped antenna (12). It is possible to prevent problems such as breakage by applying force.
[4] The vehicle rod-shaped antenna device shown in the embodiment
An antenna mounting base (11) mounted on the vehicle body wall (1), a rod-shaped antenna (12) whose base end is detachably fixed to the antenna mounting base (11), and the rod-shaped antenna ( 12) and an antenna mounting base (11), the antenna support angle variable mechanism (20) is detachably inserted, the antenna support angle variable mechanism (20),
A pair of coupling elements (21) and (22) that are pivotally supported so that their one end portions are relatively rotatable, and the other end portion of the first coupling element (21) is connected to the antenna mounting base (11 ) Or the rod-shaped antenna (12) is a screw rod (25) that can be detachably screwed, and the other end of the second coupling element (22) is the antenna mounting base. (11) or an antenna support angle variable member (24) which is a screw hole (26) removably screwable to the other of the rod-shaped antenna (12),
A fixing nut (28) for fixing the screwed state of the screw rod (25) to either the antenna mounting base (11) or the rod-shaped antenna (12);
It is characterized by consisting of.
[0037]
The above-described vehicular rod-shaped antenna exhibits the same function as that designed and manufactured as a variable support angle vehicular rod-shaped antenna that can be raised and lowered from the beginning. That is, when there is a possibility that the rod-shaped antenna (12) may come into contact with surrounding obstacles when washing the car or putting it in the garage, the rod-shaped antenna (12) is bent by bending the antenna support angle varying mechanism (20). By making the face down, it is possible to prevent the rod antenna (12) from being broken or damaged. Moreover, since the antenna support angle variable mechanism (20) is detachable, it can be easily replaced when the antenna support angle variable mechanism (20) itself is damaged, and the FM wave reception sensitivity of the antenna can be improved. Under circumstances that need to be emphasized, the antenna support angle variable mechanism (20) can be easily removed and used.
[0038]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the antenna support angle variable mechanism which can transform the existing support bar fixed-type vehicle rod-shaped antenna apparatus into the support angle variable type vehicle rod-shaped antenna apparatus, and a vehicle equipped with this mechanism A rod-shaped antenna device can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a vehicle rod antenna device according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a specific configuration of an antenna support angle varying mechanism according to the first embodiment of the present invention.
FIG. 3 is a view more specifically showing the structure of the antenna support angle varying member according to the first embodiment of the present invention.
FIG. 4 is a diagram showing an actual measurement result of an experimental example (S / N sensitivity measurement for AM wave) of the vehicular rod-shaped antenna device according to the first embodiment of the present invention.
FIG. 5 is a diagram showing an actual measurement result of an experimental example (S / N sensitivity measurement for FM waves) of the vehicular rod-shaped antenna device according to the first embodiment of the present invention.
[Explanation of symbols]
1 ... Body wall
2 ... Antenna mounting hole
10 ... Antenna body
11 ... Antenna mounting base
12 ... Rod antenna
15, 25 ... Screw rod
16, 26 ... Screw holes
20 ... Antenna support angle variable mechanism
21, 22 ... first and second coupling elements
23 ... Shaft support
24. Antenna support angle variable member
27 ... Shaft support mechanism
28 ... Fixing nut
30 ... Protective cover

Claims (5)

In an antenna support angle variable mechanism provided so as to be detachably inserted between an antenna mounting base mounted on a vehicle body wall and a rod-shaped antenna whose base end is screwed and fixed to the base .
It consists of a pair of coupling elements that are pivotally supported so that their one ends can be rotated relative to each other, and the other end of the first coupling element can be detachably screwed into the screw hole of the antenna mounting base. It has a such threaded rod, a second other end portion of the coupling element, before Symbol antenna support angle varying member which is freely become screwable threaded holes detachable to the threaded rod of the rod-shaped antenna,
A fixing nut for fixing the screwed state of the threaded rod against the antenna mounting base member,
The screw rod of the other end of the first coupling element and the screw rod of the rod-shaped antenna are of the same type, and the screw hole of the other end of the second coupling element and the antenna mounting base An antenna support angle variable mechanism, wherein the screw hole is the same type . In an antenna support angle variable mechanism provided so as to be detachably inserted between an antenna mounting base mounted on a vehicle body wall and a rod-shaped antenna whose base end is screwed and fixed to the base.
It consists of a pair of coupling elements that are pivotally supported so that their one ends can be rotated relative to each other. The other end of the first coupling element can be detachably screwed into the screw rod of the antenna mounting base An antenna support angle variable member that is a screw hole, and the other end of the second coupling element is a screw rod that can be removably screwed into the screw hole of the rod-shaped antenna;
A fixing nut for fixing the screwed state of the screw rod of the antenna mounting base;
The screw hole of the other end of the first coupling element and the screw hole of the rod-shaped antenna are of the same type, and the screw rod of the other end of the second coupling element and the antenna mounting base An antenna support angle variable mechanism characterized in that the screw rod is the same type. To allow the support angle variable setting operation of the antenna support angle varying member, according to claim 1 or 2, characterized in that a protective cover made of an elastic member which is covered on the outer periphery of the antenna support angle varying member Antenna support angle variable mechanism. An antenna mounting base mounted on the vehicle body wall;
A rod-like antenna whose base end is detachably fixed to the antenna mounting base;
An antenna support angle variable mechanism that is detachably inserted between the rod-shaped antenna and the antenna mounting base, and the antenna support angle variable mechanism includes:
A pair of coupling element having one end portion to each other is as journalled a relatively rotatable, the other end portion of the first coupling element, can be freely screwed detachably attached to the screw hole of the antenna mounting base It has a such threaded rod, a second other end portion of the coupling element, before Symbol antenna support angle varying member which is freely become screwable threaded holes detachable to the threaded rod of the rod-shaped antenna,
A fixing nut for fixing the screwed state of the threaded rod against the antenna mounting base member,
The screw rod of the other end of the first coupling element and the screw rod of the rod-shaped antenna are of the same type, and the screw hole of the other end of the second coupling element and the antenna mounting base A rod-shaped antenna device for a vehicle , wherein the screw hole is of the same type . An antenna mounting base mounted on the vehicle body wall;
A rod-like antenna whose base end is detachably fixed to the antenna mounting base;
An antenna support angle variable mechanism that is detachably inserted between the rod-shaped antenna and the antenna mounting base, and the antenna support angle variable mechanism includes:
It consists of a pair of coupling elements that are pivotally supported so that their one ends can be rotated relative to each other. The other end of the first coupling element can be detachably screwed into the screw rod of the antenna mounting base The other end of the second coupling element is attached to and detached from the screw hole of the rod-shaped antenna. An antenna support angle variable member that is a screw rod that can be screwed together;
A fixing nut for fixing the screwed state of the screw rod of the antenna mounting base;
The screw hole of the other end of the first coupling element and the screw hole of the rod-shaped antenna are of the same type, and the screw rod of the other end of the second coupling element and the antenna mounting base A rod antenna device for a vehicle, wherein the screw rod is of the same type.

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