JPH077310A - Antenna system - Google Patents

Abstract

(57) [Summary] (Modified) [Object] The present invention realizes highly accurate antenna characteristics by ensuring high-performance anti-vibration characteristics and enabling diversification of anti-vibration characteristics. Especially. [Structure] A column 10 to which an antenna 11 is attached so that its direction can be controlled is freely connected to a mounting base 13 via a spherical bearing, and elastically supported in an upright state via an elastic support member.
Further, a mounting leg 12 is provided on the column 10, and the mounting leg 1
2 is configured to be installed on the mounting base 13 with a damper, which is a combination of a non-linear spring and a friction material, interposed and the intended purpose is achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device suitable for mounting on a moving body such as a ship or a vehicle.

[0002]

2. Description of the Related Art Conventionally, an antenna device mounted on a ship is required to have directional characteristics with respect to the whole sky, so that there is a so-called inverted pendulum type mounting structure which is directionally controllably mounted on a tip of a column. To be taken. As such a mounting structure, USP, No. 4582291 or the like is known, and as shown in FIG. 9, the antenna 1 is mounted on the tip of the support column 2 so that the orientation can be controlled. A plurality of legs 2a are formed at the base end of the support column 2 so as to correspond to a mounting base 3 provided on the ship, and the base end side is freely connected to the mounting base via a spherical bearing 4 ( (See FIG. 10). And this prop 2
Is mounted through the spherical bearing 4 as shown in FIG.
Is elastically supported in an upright state with respect to the mounting base 3 by using the elastic support member 5 in a state of being freely connected. As shown in FIG. 12, the elastic support member 5 applies a central return spring force to the support column so that its natural frequency ω is k,
Assuming that the leg length of the column 2 is r, the mass of the antenna is m, the gravitational acceleration is g, the column length is l, and the moment of inertia is I, then ω = ((kr ² −mgl) / I) ^1/2 It is expressed by the formula. This is the spring constant k of the elastic support member 5.
If is set to a small value, the natural frequency ω is decreased, and if the inclination of the mounting base 3 is increased, the spring is crushed and does not serve as a vibration system. On the other hand, if the spring constant k is set to a large value, Since the frequency ω becomes high and the vibration damping function is lost, the spring constant k is set in consideration of these.

A limiter 6 is provided at the tip of the leg of the column 2, and the position of the column is regulated by the limiter 6 so that the column does not tilt more than a certain amount. In the above configuration,
The pillar 2, the spherical bearing 4, and the elastic support member 5 are mounted on the mounting base 3.
Is horizontal and has a small vibration amplitude, they cooperate to form a vibration system to prevent vibration from the mounting base and prevent transmission of the vibration to the antenna 1 on the column.

However, due to the vibration isolation structure of the antenna device, it is possible to provide effective vibration isolation by mounting it on a large ship that is relatively stable and has a high natural frequency of the mounting structure. Although it is possible to do it, when it is mounted on a small ship that is relatively swaying and it is difficult to increase the natural frequency of the mounting structure, effective vibration isolation is difficult due to the structure of its vibration system, There is a problem in that the application range is limited. That is, in the case of a small boat, it is difficult to set the natural frequency of the mounting structure to a high value by forming the mounting structure to the mounting base sufficiently strong because of the loading weight of the ship. However, since the vibration is larger than that of a large ship, effective vibration isolation cannot be achieved unless the natural frequency of the vibration system is further reduced.
It is difficult to deal with due to the setting restrictions of.

The problem of anti-vibration in this mobile-mounted antenna device is that, due to the directivity of the antenna 1, the mounting structure is a so-called inverted pendulum-type top heavy structure, so that the anti-vibration The impact resistance directly affects the antenna characteristics, which is a serious problem.

[0006]

As described above, in the conventional antenna device, it is difficult to obtain a satisfactory vibration damping characteristic when the antenna is mounted on a ship with great vibration due to the structure of the vibration system. However, there is a problem in that

The present invention has been made in view of the above circumstances, and achieves highly accurate antenna characteristics by ensuring high-performance vibration-damping characteristics and diversifying the vibration-damping characteristics. It is an object to provide an antenna device.

[0008]

SUMMARY OF THE INVENTION According to the present invention, an antenna is attached to a tip end portion of the antenna in a directionally controllable manner, and a plurality of mounting legs are radially provided at a base end corresponding to a mounting base. Universal joint means for freely connecting one end of the mounting leg side to the mounting base, elastic supporting means for elastically supporting the support column in a substantially upright state with respect to the mounting base, and mounted on the mounting base. The antenna device is configured by including an elastic body portion that gives a non-linear elastic force to the mounting leg of the support column and a damper means having a friction body portion that gives a vibration damping force.

[0009]

According to the above construction, the elastic support means imparts a central restoring force to the support column, and the damper means imparts a non-linear elastic force and a vibration damping force. The anti-vibration is performed, and the damper means executes the anti-vibration of the large vibration and the damping of the vibration. As a result, it is possible to effectively prevent and damp the vibration associated with the small shaking or the large shaking of the mounting base without being affected by the natural frequency of the mounting structure.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an antenna apparatus according to an embodiment of the present invention. An antenna 11 is attached to the tip of a mounting column 10 so that the pointing of the antenna 11 can be controlled. Prop 1
At the base end of 0, a plurality of mounting legs 12 are provided radially opposite to a mounting base 13 provided on the ship.
As shown in FIG. 2, each of the 2 is provided with a recessed locking portion 12a at the tip thereof. Then, the locking portion 12 of the mounting leg 12
The damper 14 is attached to a.

In the damper 14, for example, as shown in FIG. 3, first and second cylindrical bodies 14a and 14b are attached to a mounting body 14c.
And a non-linear spring 14d having a spring characteristic shown in FIG. 4 and a friction member 14e are interposed between the first and second cylindrical bodies 14a and 14b. Of these, a locking groove 14f is formed in the first cylindrical body 14a so as to correspond to the locking portion 12a of the mounting leg 12, and the locking portion 12a of the mounting leg 12 is inserted in the locking groove 14f. Be worn. Then, the mounting body 14c is mounted on the mounting base 133 via the bolt 14g.

The base 10 of the column 10 is mounted on the mounting base 1 via the spherical bearing 4 (see FIG. 10) as described above.
3 and the elastic support member 5 (see FIG. 1).
(Refer to 0), the antenna 11 is elastically supported in an upright state with respect to the mounting base 13, and the antenna 11 is installed in a so-called inverted pendulum type.

The mounting legs 12 of the support column 10 are formed in two or more places depending on the direction of the antenna 10. In the above configuration, when vibration is applied to the mounting base 13, the elastic support member 5 and the damper 14 act to dampen the vibration and prevent it from propagating to the antenna 11 via the column 10. . That is, the damper 14 is shown in FIG.
When a vibration is applied to the mounting base 13 by taking the vibration damping structure shown in FIG. 2, a relatively small vibration is damped by the elastic support member 5, and a relatively large vibration is damped by the nonlinear spring 14 of the damper 14.
Anti-vibration due to d. At the same time, the damper 14 damps the vibration by the damping force of the friction material 14e as shown in FIG. As a result, the antenna 11 at the tip of the column 10 can be controlled with high accuracy without being affected by the vibration or shock applied to the mounting base 13.

As a result of a vibration test using the vibration-proof structure according to the present invention, effective vibration-proof characteristics are obtained as shown in FIG. 7, which is in comparison with the conventional type vibration-proof characteristics shown in FIG. It is confirmed that it is effectively improved.

As described above, the antenna device is used in the antenna 1
1 is a support base 1 on which a directional control can be freely mounted
3 is freely connected to the shaft 3 via a spherical bearing 4, and is elastically supported in an upright state via an elastic support member 5. Further, a mounting leg 12 is provided on the support column 10, and the mounting leg 12 is connected to the nonlinear spring 14d and It was configured to be installed on the mounting base 13 with a damper 14 that is a combination of friction materials 14e interposed.

According to this, when vibration is applied to the mounting base 13, a smaller vibration is suppressed by the central restoring force given by the elastic support member 5, and the nonlinear spring 14 of the damper 14 is prevented.
Large vibrations are damped by the elastic force of d, and vibrations are damped by the vibration damping vibration damping force of the friction material 14e, so that vibrations associated with small or large shaking of the mounting base 13 are effectively damped. And decay. Therefore, large vessels,
When mounted on a small vessel, an effective anti-vibration function can be obtained without specially strengthening the mounting structure, and the pointing control of the antenna 11 can be performed regardless of vibration and shock, and high Accurate antenna characteristics can be obtained.

Further, according to this, there is an advantage that the damper 14 can be thinned to the minimum due to its damper structure. In the above embodiment, the damper 14 is configured by integrally combining the non-linear spring 14d and the vibration damping friction material 14e, but the damper 14 is not limited to this. 14e is separated and these nonlinear springs 14d,
Alternatively, one of the friction members 14e may be separately provided for each mounting leg of the support column.

As a means for attaching the damper 14 to the mounting leg 12 of the column 10, a locking portion 12a is provided on the mounting leg 12 as in the above embodiment, and is engaged with the first cylindrical body 14a of the damper 14. Although the groove 14f is provided so as to be attached to each other, the present invention is not limited to this, and it is possible to use a flange or various attachment means.

Furthermore, in the above-mentioned embodiment, the case of being configured to be mounted on a ship was described as a representative, but the present invention is not limited to this, and it may be configured to be mounted on a moving body such as an automobile. . Therefore, the present invention is not limited to the above-described embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

[0020]

As described in detail above, according to the present invention, it is possible to achieve high-precision antenna characteristics by ensuring high-performance anti-vibration characteristics and diversifying anti-vibration characteristics. The antenna device can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing an antenna device according to an embodiment of the present invention.

FIG. 2 is a diagram showing details of a mounting leg of FIG.

FIG. 3 is a diagram showing the damper of FIG. 1 taken out.

FIG. 4 is a diagram showing spring characteristics of a nonlinear spring of the damper shown in FIG.

FIG. 5 is a diagram showing the concept of the vibration isolation structure of FIG. 1.

FIG. 6 is a diagram showing damper characteristics of the damper shown in FIG.

FIG. 7 is a diagram showing the image stabilization characteristics of FIG.

FIG. 8 is a diagram showing a vibration isolation characteristic of a conventional antenna device.

FIG. 9 is a diagram showing a conventional antenna device.

FIG. 10 is a diagram showing a part of the details of FIG. 9;

FIG. 11 is a diagram showing a part of details of FIG. 9;

FIG. 12 is a view showing the concept of the image stabilization structure of FIG.

[Explanation of symbols]

 4 ... Spherical bearing. 5 ... Elastic support member. 10 ... Posts. 11 ... Antenna. 12 ... Mounting legs. 13 ... Mounting base. 14 ... Damper. 14a ... 1st cylinder. 14b ... 2nd cylinder. 14c ... Mounting body. 14d ... Non-linear spring. 14e ... Friction material. 14f ... Locking groove. 14g ... bolt.

Claims (2)

[Claims] 1. A column having an antenna attached to the tip end portion thereof so as to be capable of directivity control, and a plurality of mounting legs radially provided at the base end corresponding to the mounting base, and one end of the column on the side of the mounting leg. Universal joint means for freely connecting to the mounting base, elastic supporting means for elastically supporting the support column in a substantially upright state with respect to the mounting base, and mounting means for mounting the support base to the mounting legs of the support column. Antenna device including an elastic body portion that applies a nonlinear elastic force and a damper means that has a friction body portion that applies a vibration damping force. 2. The antenna device according to claim 1, wherein the damper means is configured such that the elastic body portion and the friction body portion are separately arranged for each mounting leg of the support column.