JPS5864804A - Antenna device - Google Patents

Abstract

PURPOSE:To improve the durability of a sector gear, by fixing a pair of left and right sector gears at both sides of a vertical shaft at the back of a reflection mirror of an antenna and driving the sector gears around its horizontal shaft through anti-backlash. CONSTITUTION:A power amplifier 11a for drive supplies driving power for left and right motors 9a, 10a with the same rating, resulting in producing the same torque toward the arrow A. Further, motors 9b, 10b produce the same torque toward the arrow B with the driving power supplied from a power amplifier 11b for driving. Then, a synthesized torque between the motors 9a, 10a and 9b, 10b is exerted to sector gears 8a, 8b, and they are turned toward the arrow D when the torque for the motors 9a, 10a is larger and reversed when that of the motors 9b, 10b is larger. Thus, a reflection mirror 2 of the antenna 1 is vertically turned with the sector gear pair (8a, 8b), allowing to share out the weight load of the antenna 1 applied to the sector gears 8a and 8b and to improve the durability.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antenna device such as a parabolic antenna. - \A conventional device of this type was shown in Fig. 1. In the figure, (1) is a parabolic antenna with a reflector (2), and (3) is a parabolic antenna with a reflector (1).
2) is fixed in a plane including its vertical axis (hereinafter referred to as AZ axis) (4), and has a semicircular sector gear (5b) with sector teeth on the outer periphery. First and second motors (7m) (7b) anti-backlash driven around a horizontal axis (hereinafter referred to as EL axis) (6)
is the first. The first motor rotates the second motor (5m) (5b), respectively. This is a second drive power amplification device.

Next, the operation will be explained.

1st. The second drive power amplifier (7s (7b) supplies drive power to the first and second motors (5s (5b)), and the first and second motors (5λX5b) Arrows A and B in the backlash drive region, respectively.
A torque corresponding to the magnitude of the supplied current is generated in the direction of , and the torque is transmitted to the sector gear (3). Normally, the torque of the motor is geared down by a gear box and transmitted to the sector gear (3) via a pinion gear, but the gear box and pinion gear are not shown here for simplicity. In this way, the combined torque of the two motors (51) and (5b) acts on the sector gear (3), and when the torque of the first motor (51) is greater, the sector gear (3) operates on the EL axis ( 6) in the direction indicated by the arrow, and when the torque of the second motor (5b) is greater, it rotates in the opposite direction. In this way, the sector gear (3) is driven with anti-backlash, and the antenna (1) rotates smoothly in the vertical plane without backlash. This antenna (1) is
Anti-backlash drive is also performed around the AZ axis (4),
Even within a horizontal plane, it rotates smoothly in the direction of arrow C or the opposite direction.

The conventional antenna device is configured as described above.
The antenna (1) was rotated in a vertical plane by two sector gears (3), but the reflector (2)
For example, if it is necessary to make the diameter of about 50cm, the load of the huge reflector (2) is directly transferred to the sector gear (
3), which reduces the durability of the sector gear (3), and the load applied to the pinion gear that directly meshes with the sector gear (3) is also very large. ) had to have a large capacity.

This invention was made to eliminate the above-mentioned drawbacks of the conventional antenna.
By providing a pair of left and right sector gears parallel to each other on the left and right sides of the Z axis, and driving the sector gears in an anti-backlash manner around the EL axis, the load of the antenna applied to the sector gears is distributed, and the antenna becomes large. In addition to improving its durability,
It is an object of the present invention to provide an antenna device that can simplify the design of a pinion gear, reduce the load on a sector gear drive motor, and eliminate the need to increase the capacity of the motor.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an antenna device according to an embodiment of the present invention.

In the figure, the same reference numerals as in Fig. 1 indicate the same parts as in Fig. 1. A pair of left and right sector gears fixed parallel to each other on both sides (9 m
) (9b) Both sides 4 Lid t” + (8m) (8b)
Sector gear on the left side of the nochi (1st and 2nd left motors for anti-backlash drive, (10m) (10m)
b) The first gear that drives the right sector gear (8b) in an anti-backlash manner. In the second right motor, the left and right first motors (9s (10@)) and the left and right second motors (9b) (10b) are all of the same standard. (11 is the left and right first motor (9m) (1
0m) are connected in series to rotate both motors (9s (10&); (llb) is on the left;
This is a second drive power amplification device that connects the second right motor (9b) (10b) in series and rotationally drives both motors (9b) (10b).

Next, the operation will be explained.

In the antenna device of this embodiment, the first drive power amplifier (11m) supplies drive power to the left and right first motors (9m) (1am) connected in series, and gi) (10m) are of the same standard, so they generate the same torque in the direction of the arrow. On the other hand, the left and right second motors (9bX10b) similarly generate the same torque in the direction of arrow B by the drive power supplied from the second drive power amplifier (llb). Then, although not shown, the solid line shows that the torque is transmitted to the sector gear (8 → (8b)) via the gear box and pinion gear, and the sector gear (8b) is connected to the first motor (9th (1)).
01) and 4! The combined torque of J2 (7) 4-ta (9b) (10b) acts, and the sector gear + (aa When the torque of the second motor (9b) (10b) is greater, it rotates in the opposite direction.

Therefore, in the antenna device of this embodiment, the reflector (2) of the antenna (1) is controlled by the pair of sector gears (8a) (gb).
) in a vertical plane, so
The load of the antenna (1) applied to the sector gears (8a) (9b) is distributed, and as a result, even if the antenna (1) is large, the durability of the sector gears (8a) (8b) is guaranteed, and the pinion gear The load applied to the
Its design becomes simple. Also, the motor (9s (9b) (1)
The load on 0a) (10b) is also reduced, and the capacity thereof does not need to be increased.

By the way, generally, as mentioned above, the left and right two sector gears are respectively set to the first. When anti-backlash driving is performed by the second motor, the same effect as above can be obtained even if each of the four motors is rotationally driven by a separate drive power amplifier, but in that case, the Four power amplifiers are required, and circuits to drive the left and right motors with appropriate lances are required, which increases costs, and if one of the four motors breaks down and stops, , the torque balance of the sector gear, which had previously shared torque between four motors, may be disrupted, which may cause the antenna reflector to be twisted.However, in this embodiment, the first motor (9a010m) and the second motor (9a010m) gb) (1ob) of the same standard, the first motor and the second motor are connected in series to form one drive power amplifier (1ob).
11) (llb), the sector gear (8m x 8b) is always rotated with the same torque, and the series connection achieves a torque balance between the left and right motors, so the circuit is simple. Yes, even if one drive power amplifier fails, both motors will stop.
The reflector (2) of the antenna (1) will not be twisted.

Moreover, if the left and right motors (9m) (10b) and (9b) (10b) are connected in series and driven, -4
Two motors (9 turtles) (9b) (10 fish x 10b) can be driven by two drive power amplifiers (11 lb), and the cost does not increase.

In general, when measuring antenna angle etc. with high precision, A
It is desirable to set a reference point at the position where the Z axis and EL axis intersect, and install a detection device such as a collimator there.
In the conventional device, since the sector gear was provided on the AZ axis, there was a drawback that a collimator or the like could not be provided at a position where the AZ axis and the EL axis intersect. On the other hand, in this device, a pair of sector gears (8m) (8b) are provided on both the left and right sides of the AZ axis (4), so that the pair of sector gears (8m) (8b) are provided at the position where the AZ axis (4) and the EL axis (6) intersect. A reference point can be set, and a collimator or the like can be installed at the reference point to perform highly accurate measurement of the antenna (1).

In the above embodiment, one pair of left and right sector gears was provided, but
A plurality of pairs of sector gears may be provided.

As described above, according to the antenna device according to the present invention, a pair of left and right sector gears are fixed to the back surface of the reflector of the antenna on both the left and right sides of the AZ axis, and the sector gears are respectively driven in anti-backlash around the EL axis. Therefore, even when increasing the size of the antenna, the antenna load applied to one sector gear can be reduced and its durability can be improved, and the design of the pinion gear can be simplified, and the capacity of the sector gear drive motor can be reduced. It can also reduce
Furthermore, there is an effect that a detection device such as a collimator can be installed on the AZ axis when performing high precision measurement of the antenna.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional antenna device, and FIG. 2 is a schematic diagram of an antenna device according to an embodiment of the present invention. (1)...Antenna, (2)...Reflector, (4)...
...Vertical axis, (6)...Horizontal axis, (8s (8b)...
- Sector gear, (9th (9b)...second left motor, (10th (10b)...first. second right motor, (11m) (llb)...first. W62 drive power amplifier (first and second right and left motor drive devices).

Claims (1)

[Claims] (11) An antenna having 11 reflectors, a pair of left and right sector gears installed parallel to each other on the left and right sides of the vertical axis on the back of the reflector of the antenna, and the left sector gear of both sector gears being connected to the horizontal axis. The first and second left motors are anti-backlash driven around the first and second left motors, and the first and second left motors are anti-backlash driven.
The right motor of this first motor. The first motor rotates the second right motor, respectively. An antenna device comprising: a second right motor drive device.