JP4044518B2 - Antenna device and balancer - Google Patents

Description

  The present invention relates to a balancer for an antenna device using a reflector used in, for example, a radar device.

  As is well known, an antenna device using a reflector has a mount that rotates in an azimuth direction and an elevation direction. The reflector and its balancer are unbalanced by setting the center of gravity position at a position slightly shifted from the true center of gravity position on the axis connecting them, thereby applying a preload to the gear of the rotating portion and backlashing. To keep the settling characteristics during driving.

However, the conventional antenna device having the above-described configuration has a problem that the center of gravity position is largely moved during driving in the elevation direction and the preload becomes zero, so that the settling property during driving is poor.
Japanese Utility Model Publication No. 2-5912

In the conventional antenna device, when the reflector moves in the elevation direction, the position of the center of gravity between the reflector and the balancer moves greatly, and the preload to the gear of the rotating part may become zero. There was a problem that the posture stability of time was poor.
The present invention has been made to solve the above problem, and even if the reflector is moved in the elevation direction, the movement of the center of gravity between the reflector and the balancer is small, and the preload to the gear of the rotating part is small. An object of the present invention is to provide an antenna device and a balancer that have high attitude stability during movement of the reflector without becoming zero.

  In order to achieve the above object, according to the present invention, in an antenna apparatus that performs observation with a reflecting plate oriented in a desired direction, a balancer that balances the weight of the reflecting plate, and a connection that connects the reflecting plate and the balancer. And a support means for supporting the connecting means, the balancer is formed with a weight distribution having different weights on the upper and lower sides thereof, and the center of gravity of the structure comprising the reflector, the balancer, and the connecting means is provided between the reflector and the balancer. The weight is distributed so that the position is shifted in the vertical direction of the connecting linear axis, and the support means is configured to support the structure at a position shifted in the horizontal direction from the vertical axis passing through the center of gravity.

  As described above, in the present invention, the balancer is formed with a weight distribution having different weights at the top and bottom, and the center of gravity of the structure composed of the reflector, the balancer, and the connecting means is the vertical direction of the linear axis connecting the reflector and the balancer. And the structure is supported at a position shifted in the horizontal direction from the vertical axis passing through the center of gravity.

  Therefore, according to the present invention, the center of gravity of the structure composed of the reflector, the balancer, and the connecting means is shifted in the vertical direction of the linear axis connecting the reflector and the balancer, and horizontally from the vertical axis passing through the center of gravity. Since the structure is supported at a shifted position, even if the reflector is moved in the elevation direction, the amount of movement of the center of gravity in the horizontal direction is less than when the center of gravity is on the linear axis, and the reflector moves. It is possible to provide an antenna device and a balancer that have high posture stability.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows the appearance of an antenna apparatus according to an embodiment of the present invention. The main components of the antenna device include a reflector 10, a shaft 20, a balancer 30, and a base 40.

  The reflector 10 transmits a radar wave to the space and receives a reflected wave of the target from the space, and is connected to the balancer 30 through the shaft 20. The base 40 has a drive mechanism that supports the shaft 20 and changes the directivity direction of the reflector 10 in the elevation direction and the azimuth direction.

FIG. 2 shows the overall center-of-gravity position of the reflector 10 and the balancer 30.
In the conventional design, on the axis S connecting the reflector 10 and the balancer 30, that is, on the shaft 20, a position shifted to the reflector 10 side by a distance L from the support position P where the shaft 20 is supported by the base 40. The weight of the balancer 30 was adjusted so that Bo becomes the center of gravity.

  In contrast, in this antenna apparatus, the weight of the balancer 30 is adjusted so that the position Bp on the circumference obtained by tilting the conventional center-of-gravity position Bo by −45 ° with respect to the elevation direction is the center of gravity. To do.

  FIG. 3 shows the balancer 30. The balancer 30 is, for example, a flat plate serving as a weight that is horizontally overlapped and fixed with bolts and nuts, and a bolt-nut group Bu for attaching a weight to the upper side of the axis S connecting the reflector 10 and the balancer 30. And a bolt-nut group Bl for attaching a weight to the lower side of the shaft S.

  Then, the balancer 30 varies the amount of weights above and below the axis S connecting the reflector 10 and the balancer 30 so that the overall center of gravity position becomes Bp as described above. That is, the amount of the lower weight of the axis S is made larger than the amount of the upper weight, and the entire center of gravity position is set to Bp.

Next, in the antenna device having the above-described configuration, a change in the gravity center position when the reflector 10 is moved in the elevation direction will be described.
In the antenna device of the conventional design, the gravity center position Bo when the reflecting plate 10 is moved by 90 ° in the elevation direction changes by a maximum of L as shown in FIG. Then, as shown in FIG. 5, the change is a maximum of L × (1-1 / √2), which is about 30% of the change compared to the conventional case. For this reason, there is little fluctuation | variation of the drive torque at the time of moving the reflecting plate 10 to an elevation direction.

Further, in the antenna device of the conventional design, when the reflector 10 is moved 90 ° in the elevation direction, the gravity center position Bo and the support position P are on the same vertical axis V, and the preload to the gear of the rotating portion is zero. Thus, the backlash cannot be removed.
On the other hand, in the antenna device having the above-described configuration, the gravity center position Bp and the support position P are not on the same vertical axis, and a preload can always be applied to the gear of the rotating portion, thereby eliminating backlash. Because it can, posture stability is high.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. Further, for example, a configuration in which some components are deleted from all the components shown in the embodiment is also conceivable. Furthermore, you may combine suitably the component described in different embodiment.

  As an example, for example, in the above embodiment, the balancer 30 is configured by a flat plate. However, as long as the center of gravity Bp can be set, for example, a single weight having a different weight in the vertical direction may be used. The same effect can be obtained even if a weight having the shape of is used.

  In the above embodiment, the case where the minimum elevation angle is 0 ° and the maximum elevation angle is 90 ° has been described as an example. However, the variable range of the elevation angle is not limited to this. In the above embodiment, since the gravity center position Bp is closer to the reflector 10 than the support position P, the gravity center position is below the horizontal axis S at the minimum elevation angle, and the gravity center position is below the horizontal axis S at the maximum elevation angle. Also on the top. Instead of this, for example, when the gravity center position Bp is on the balancer 30 side with respect to the support position P, the gravity center position is above the horizontal axis S at the minimum elevation angle, and the gravity center position is at the horizontal axis S at the maximum elevation angle. If it is below, the same effect is exhibited.

  In addition, it goes without saying that the present invention can be similarly implemented even if various modifications are made without departing from the gist of the present invention.

The figure which shows the external appearance of the antenna apparatus concerning this invention. The figure for demonstrating the whole gravity center position of the reflecting plate and balancer of the antenna apparatus shown in FIG. The elevation view which shows the structure of the balancer of the antenna apparatus shown in FIG. The figure for demonstrating the gravity center movement at the time of the movement of the reflecting plate in the conventional antenna device. The figure for demonstrating the gravity center movement at the time of the movement of the reflecting plate in the antenna apparatus shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Reflector, 20 ... Shaft, 30 ... Balancer, 40 ... Base, Bu ... Bolt-nut group, Bl ... Bolt-nut group, Bo ... Center of gravity position, Bp ... Center of gravity position, L ... Distance, P ... Support position , S ... axis, V ... vertical axis.

Claims (5)

In an antenna device that performs observation by directing a reflector in a desired direction,
A balancer that balances the weight with the reflector;
Connecting means for connecting the reflector and the balancer;
And supporting means for supporting the connecting means,
The balancer is formed with a weight distribution having different weights at the top and bottom, so that the center of gravity of the structure composed of the reflector, the balancer, and the connecting means is shifted in the vertical direction of the linear axis connecting the reflector and the balancer. Distribute the weight so that
The antenna device according to claim 1, wherein the support means supports the structure at a position shifted in a horizontal direction from a vertical axis passing through the center of gravity . The balancer is formed with a weight distribution having different weights at the top and bottom thereof, so that the center of gravity of the structure is on the reflector side with respect to the support position by the support means, and the reflector is directed to the minimum elevation angle Weight distribution was performed so that the center of gravity of the structure would be in the downward position of the linear axis and the center of gravity of the structure would be in the upward direction of the linear axis when the reflector is oriented at the maximum elevation angle. The antenna device according to claim 1 . The balancer is formed with a weight distribution having different weights at the top and bottom, so that the center of gravity of the structure is on the balancer side with respect to the support position by the support means, and the structure is used when the reflector is directed to the minimum elevation angle. When the center of gravity of the object is in the upward position of the linear axis and the reflector is oriented at the maximum elevation angle, the weight is distributed so that the center of gravity of the structure is in the downward direction of the linear axis. The antenna device according to claim 1 . Used in an antenna device having support means for supporting at a position shifted in a horizontal direction from a vertical axis passing through the center of gravity of a structure including a reflector, and connected to the reflector via the reflector in the structure. A balancer that balances the weight with the reflector,
The balancer has weights that are different in weight distribution between the upper part and the lower part of the balancer, and the center of gravity of the structure composed of the reflector, the balancer, and the connecting means is shifted in the vertical direction of the linear axis that connects the reflector and the balancer A balancer characterized by weight distribution so as to be positioned. Used in an antenna device having support means for supporting at a position shifted in a horizontal direction from a vertical axis passing through the center of gravity of a structure including a reflector, and connected to the reflector via the reflector in the structure. A balancer that balances the weight with the reflector,
First attaching means for attaching a weight to an upper portion of the balancer;
A second attachment means for attaching a weight to the lower part of the balancer;
A weight having a weight different from each other is attached to the first attachment means and the second attachment means, and the center of gravity of the structure composed of the reflection plate, the balancer, and the connection means is connected to the reflection plate and the balancer. The balancer is characterized in that the weight is distributed so as to be shifted in the vertical direction of the connecting linear axis.

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