JPH0631769Y2 - Automatic antenna tracking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an automatic antenna tracking device, particularly a device for automatically tracking an antenna used on a moving body such as a ship to a target such as a radio wave emission source. Regarding

(Prior Art) In a moving body such as a ship, a fixed radio wave emission source (for example,
In order to receive a radio wave from a broadcasting station or the like), it is necessary to direct the radio wave receiving antenna to the radio wave emission source according to the movement of the mobile body.

As a means for this, for example, a simple antenna rotating device is known, which allows an antenna to be rotated by a motor, and the motor is manually operated every time the beam direction of the antenna deviates from the radio wave emission source to eliminate the deviation. Has been.

There is also a device capable of automatically pointing an antenna to a desired specific point in consideration of a change in direction of a ship during navigation. In this case, it is common to adjust the beam direction of the antenna using the output signal of the gyro compass, but it is necessary to adjust the rotation speed of the antenna with respect to the rotation speed of the repeater motor of the gyro compass, Conventionally, the gear ratio of the gear device is often adjusted for this adjustment.

(Problems to be Solved by the Invention) However, in the former device, the user has to operate the device each time the beam direction of the antenna deviates from a predetermined pointing point. Is extremely inefficient. Also, the latter devices are generally expensive and unsuitable for use in receiving terrestrial television stations on mobiles, for example. In particular, if the speed increasing ratio of the repeater motor of the gyro compass changes, the gear device needs to be changed.However, the gear device becomes complicated, and the torque for driving the gear device fluctuates. Fluctuates the load.

Therefore, the present invention solves the problems of the above-described conventional example and has an automatic follow-up function with a simple configuration, and in particular, changes a gear device to a desired antenna rotation speed for a desired speedup ratio of a repeater motor. It is an object of the present invention to provide an automatic tracking device for an antenna that can be obtained without doing so.

(Means for Solving the Problem) In order to achieve the above object, an automatic antenna tracking device according to the present invention is rotated by a repeater motor of a gyrocompass and has a predetermined angular width. A rotary light shield that blocks light except for the light-transmitting part, an optical interrupter that receives and interrupts the received light in response to the rotation of the rotary light shield, and outputs a signal according to the interrupted received light, The rotating circuit comprises: an exciting circuit that excites the stepping motor in response to an output signal of the optical interrupter; a stepping motor that is driven by the exciting circuit; and an antenna mounting base that is rotated by the stepping motor. The light shield is made by fixing a plurality of rotating light shield plates having the light transmitting portion with the rotation shaft rotated by the repeater motor being out of phase with each other. The rotation speed of the stepping motor relative to the rotation speed of the repeater motor is determined by adjusting the predetermined angular width of the light-transmitting part and the number of light-transmitting parts of each rotating light-shielding plate provided on each of the light-shielding plates. . (Claim 1).

Further, the rotary light shield is composed of a single rotary light shield plate having the light transmitting portion, and a plurality of the optical interrupters are provided on the rotary light shield plate with a phase shift, and a predetermined angular width of the light transmitting portion and the The rotation speed of the stepping motor with respect to the rotation speed of the repeater motor may be determined by adjusting the number of optical interrupters (claim 2).

Further, according to the invention described in claim 1, the light-transmitting portion of each rotary light-shielding plate is formed on one of the two rotary light-shielding plates that are provided out of phase with the rotary light-shielding plate. The light transmitting portion of the rotary light shielding plate is formed to have a predetermined angle width that partially overlaps the light transmitting portion in terms of phase angle (Claim 3). Exciting the stepping motor in the 1-2 phase by forming the stepping motor into a predetermined angular width that is larger than the angular width between the adjacent optical interrupters and smaller than the angular width across the three adjacent optical interrupters in sequence (claim 4). It is in.

(Operation) Therefore, when a displacement occurs in the moving body in the azimuth direction and a signal from the gyrocompass according to the displacement is generated, the repeater motor rotates according to the signal from the gyrocompass and the rotary light shield rotates.

Then, since the optical interrupter outputs an intermittent signal according to the rotation of the rotary light shield, by applying this output signal to the stepping motor via the excitation circuit, the signal generated by the gyro compass is responded to. It is possible to rotate the stepping motor.

In this case, according to the invention of claim 1, the predetermined angular width of the light-transmitting portion and the number of light-transmitting portions of each rotary light shielding plate are adjusted with respect to a desired speedup ratio of the repeater motor of the gyro compass. Thus, in the device according to claim 2, the rotation speed of the stepping motor can be set to a desired value by adjusting the predetermined angular width of the light transmitting portion and the number of the optical interrupters. The above-mentioned object can be achieved.

Further, according to the invention of claim 1, the light-transmitting portion of each rotary light-shielding plate is formed on one of the two rotary light-shielding plates that are provided out of phase with the rotary light-shielding plate. A predetermined angle width that partially overlaps with the light portion on the phase angle is formed, or in the invention according to claim 2, the light transmitting portion of the rotary light shielding plate is formed from an angle width between adjacent optical interrupters. The stepping motor can be excited in the 1-2 phase and the precision of the excitation timing does not need to be strict if it is formed to have a predetermined angular width smaller than the angular width across the three adjacent optical interrupters. Therefore, it is possible to give a margin to the attachment of the rotary shading plate.

As a result, manufacturing and assembling can be facilitated.

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

In FIG. 5, there is shown a schematic configuration of a radio wave receiving system using the device according to the present invention, and 1 is a gyro compass having a well-known structure which is usually equipped in, for example, a ship in which the device is used. This gyro compass 1 always operates so as to face the true north direction, always points north even if there is a change in the navigation direction of the ship, and outputs a signal corresponding to the motor change amount to the repeater motor described later. ,
It is the north of it.

This device A uses the output signal of the gyro compass 1 as an input signal, rotates the antenna 2 in accordance with the input signal, and causes the antenna 2 to always face the radio wave emission source 3. .

FIG. 1 shows an embodiment of the present apparatus A, and this embodiment will be described below with reference to the drawing.

Reference numeral 4 denotes a repeater motor using a stepping motor, which is driven directly by the output signal of the gyrocompass 1 applied to the terminals a to d to rotate. The rotation of the repeater motor 4 is transmitted to the shaft 6e of the rotary light shield 6 described later via the gear device 5.

There are various types of repeater motors 4 having different numbers of rotations with respect to the output signal of the gyro compass 1, for example, 360 revolutions, 180 revolutions, 90 revolutions or the like for one revolution (360 degrees) in the horizontal direction of the gyro compass 1. Usually, the ratio of the rotation speed of the gyro compass 1 in the horizontal direction to the rotation speed of the repeater motor 4 is called a speed increasing ratio, and as described above,
One that rotates 60 times is 360X, and one that rotates 180 is 1
Those that rotate 80X and 90 are referred to as 90X and the like.

More specifically, the repeater motor 4 makes one rotation, 1/2 rotation, and 1/4 rotation with respect to 1 degree in the horizontal direction of the gyrocompass 1. In other words, with respect to the horizontal 1 degree of the gyro compass 1, the repeater motor 4
One rotation makes 360X, one that makes 1/2 rotation for 1 degree in the horizontal direction of the gyro compass 180 is 180X, and one that makes 1/4 rotation for 1 degree in the horizontal direction of the gyro compass 1 is 90X acceleration. Called ratio.

In the end, it is necessary that the rotation of the antenna 2 also becomes 1 degree with respect to the 1 degree change in the horizontal direction of the gyro compass 1, but the adjustment for this is performed by the selected repeater. The rotation speed of the motor 4 is adjusted by the gear ratio of the gear device 5 and the gear device 20 as will be described later, and the predetermined angular width of the transparent portion 7 of the rotary light shield and the rotary light shield plates 6a to 6a.
6d, the number of light-transmitting portions 7 is adjusted, or a predetermined angle width of the light-transmitting portion 7 and the number of optical interrupters are adjusted.

The present invention adjusts the rotational speed of the gyro compass 1 by adjusting the predetermined angular width of the light-transmitting portion 7 of the rotary light-shielding plate, the number of the light-transmitting portions 7 and the number of optical interrupters, or the arrangement thereof. On the other hand, a technique for adjusting the rotation speed of the antenna 2 and a technique for exciting the stepping motor 17 in 1-2 phase are described below. That is, the present invention has a remarkable technique in solving the speed increasing ratio of the repeater motor 4 of the gyro compass 1 and in the 1-2 phase excitation method of the stepping motor 17.

Reference numeral 6 denotes a rotary light shield, which is composed of four rotary light shield plates 6a to 6d and a shaft 6e for mounting them.

Each of the rotary light-shielding plates 6a to 6d is a circular plate formed of a non-translucent member, and an arc-shaped light-transmitting portion 7 corresponding to an arc angle of 135 degrees is formed on the peripheral portion of the disk.

As shown in FIG. 2, each of the rotary shading plates 6a to 6d faces one end of the shaft 6e, and one end of the transparent portion 7 of each of the rotary shading plates 6a to 6d rotates clockwise. 9 in direction
The shaft 6e is inserted into the central hole 8 formed in the center of the rotary light shielding plates 6a to 6d so as to be displaced by 0 degree.
It is fixed at an appropriate interval.

Reference numerals 9a to 9d denote optical interrupters, which are known elements called photointerrupters, and the present embodiment is of a so-called transmission type.

The photo interrupters 9a to 9d are arranged on the same straight line parallel to the axis 6e described above, and in such a manner that the peripheral portions of the rotary light shielding plates 6a to 6d are located in the gaps 10 each of them has.

Then, the light emitting elements 11 of the photo interrupters 9a to 9d
Has a cathode grounded and an anode having resistors 12a to 12d
Is connected to the emitter of the light receiving element 13 via, and this connection point is connected to the power source via resistors 14a to 14d.

On the other hand, the collector of the light receiving element 13 is grounded through the resistors 15a to 15d and connected to the bases of the transistors 16a to 16d.

Therefore, when the light-transmitting portion 7 of the rotary light-shielding plates 6a to 6d is located in the gap 10 of the photo interrupters 9a to 9d, the light from the light emitting element 11 receives the light from the light receiving element 13.
Is incident on the light receiving element 13, and the light receiving element 13 is rendered conductive. In FIG. 1, the photo interrupter 9a corresponds to the above-mentioned state.

The collectors of the transistors 16a to 16d are connected to the exciting coils 17a to 17d via the terminals T ₁ , T ₃ , T ₅ and T ₇ of the stepping motor 17. Further, the collectors of the transistors 16a to 16d are diodes 18a.
.About.18d and a resistor 19 are connected to the power supply, and the emitter is grounded.

Reference numeral 17 denotes a stepping motor, which is exciting coils 17a to 17
Among the terminals T _{1 to} T ₈ to which d is connected, T ₁ , T ₃ , T ₅ ,
T ₇ is as described above, and the other terminals T ₂ , T ₄ , T ₆ and T ₈ are collectively connected to the power source.

Therefore, when the rotary light shield 6 makes one rotation, a drive current flows through each of the exciting coils 17a to 17d as shown in FIG.

The excitation method of the stepping motor 17 as shown in FIG. 1 is generally called 1-2 phase excitation. This 1-
In the case of two-phase excitation, there is a feature that there is a margin in the timing of switching the excitation phase. Specifically, in this embodiment, as can be seen from FIG. 2 and FIG. 3, for example, the excitation of the excitation phase φ ₂ is delayed by 90 degrees from the rise of the excitation signal of φ ₁ . The excitation of φ ₃ is delayed by 180 degrees from the excitation of φ ₁ , and φ ₄
Is 270 degrees behind that of φ ₁ .

However, the rising edge of the φ ₁ signal is delayed by 135 degrees from the rising edge, and the falling edge of the φ ₂ signal is 13 degrees behind the rising edge.
It is delayed by 5 degrees, but 90 from the rising edge of the signal to the falling edge.
It may be between 180 degrees and 180 degrees, but not necessarily 135
It is not limited to degrees.

In other words, it is not necessary to accurately set each of the light-transmitting portions 7 of the above-described rotary light-shielding plates 6a to 6d to 135 degrees, and 90 degrees or more 1
The deviation may be within the range of 80 degrees or less.

In other words, if the light-transmitting portion 7 of each of the rotary light-shielding plates 6a to 6d is limited to 135 degrees, the rotary light-shielding plate 4 for the shaft 6e is provided.
The mounting of the sheets is exactly 90 degrees, 0 degrees, 90 degrees, 180 degrees,
There is no need to shift it by 270 degrees, and when considering only one rotating light shielding plate, it may be shifted up to ± 45 degrees, and there is a margin in mounting the rotating light shielding plate as a whole, so it is sufficient to shift by 90 degrees. There is also a merit in production.

A gear device 20 is connected to a rotating shaft (not shown) of a rotor 17e of the stepping motor 17, and an antenna mounting base 21 for mounting the antenna 2 via the gear device 20 is provided by the stepping motor 17 described above. It is designed to be rotated.

Next, the relationship among the number of revolutions of the repeater motor, the gear ratio of the gear device 5, and the gear ratio of the gear device 20 in this device will be specifically described.

First, it is assumed that a 360X repeater motor 4 and a stepping motor 17 with a step angle of 0.9 degrees are used. Here, the step angle of the stepping motor 17 being 0.9 degrees means that the rotary light shield 6
Is rotated once, the rotor 17 of the stepping motor 17
e means 3.6 degrees, that is, 1/100 rotation.

Next, assume that 1: 1 is selected as the gear ratio of the gear device 5. That is, the shaft 6e makes one rotation with respect to one rotation of the repeater motor 4.

From the above, the gyro compass 1 is
When the change of 0 degree occurs, the rotor 17e of the stepping motor 17 rotates 360 × 1 × 1/100 = 3.6 rotations.

Therefore, in order to make the rotation of the antenna mounting base 21 the same as the change of the gyro compass 1, the gear ratio of the gear device 20 is 1 / 3.6, that is, (rotation of the stepping motor 17): (antenna mounting base). 21 rotations) = 3.6: 1. In other words, for one rotation of the stepping motor 17, the antenna mounting base 21 is
Therefore, it is necessary to set the gear ratio of the gear device 20 so as to rotate /3.6.

The operation of the above configuration will be described below.

First, a power switch (not shown) is turned on to supply power to the device. At this time, the gyro compass 1 and the repeater motor 4 are made non-conductive by using, for example, a switch (not shown).

Next, the direction of the antenna 2 is initially set.
For example, in the case of receiving a television broadcast, the repeater motor 4 is set so that the reception level is the best, that is, the received image becomes clear.
The rotor shaft (not shown) may be manually rotated, and the manual rotation may be stopped when the received image becomes clearest.

By rotating the rotor shaft (not shown) of the repeater motor 4, the rotary light shield 6 rotates, and the exciting coils 17a to 17d of the stepping motor 17 are rotated according to the rotation angle.
An exciting current as shown in FIG. As a result,
Since the rotor shaft 17e of the stepping motor 17 rotates and the antenna mounting base 21 rotates via the gear device 20, the antenna 2 can be oriented in a desired direction.

After that, the gyro compass 1 and the repeater motor 4 are connected (the switch is turned on if the gyro compass 1 and the repeater motor 4 can be connected and disconnected by the switch as described above). At this time, if the navigation direction of the vessel in which this device is installed is constant, for example, as shown in FIG. 6 (a), in the true north direction, the gyro compass 1 is stable, and the repeater output signal does not change. Even if the gyro compass 1 and the repeater switch 4 are connected, the antenna 2 is not rotated. Therefore, the broadcast can still be well received.

In FIG. 6, 22 is a ship, 2 is an antenna, and 3 is
Represents the radio wave emission sources in the direction of α ₁ degrees east of true north.

Next, as shown in FIG. 6 (b), if the navigation direction of the vessel 22 is deviated from true north by α ₂ degrees, the beam direction of the antenna 2 is also east of the radio wave emission source 3 by α ₂ degrees at this moment. It shifts in the direction and it becomes impossible to receive the broadcast.

However, at this time, the gyro compass 1 outputs a signal corresponding to the azimuth change of α ₂ degrees, and the repeater motor 4 is rotated by this output signal, whereby the stepping motor 1
7, the antenna mounting base 21 rotates in the true north direction by α ₂ degrees.

As a result, the beam of the antenna 2 coincides with the direction of the radio wave emission source 3 as shown in FIG. 6 (c), and good radio waves can be received as in the previous case.

If the ship 22 is navigating, the positional relationship between the antenna 2 and the radio wave emission source 3 is strictly different from that at the time of the initial setting described above and thereafter, but the radio wave emission source on land is from the sea. Is generally distant and compared to this distance
Since the moving distance is small and the influence on the angle in the horizontal direction is practically no problem, it is not particularly considered in this device.

For example, in the case of use on a ship with a relatively narrow motion range such as Tokyo Bay, the configuration of this device is sufficiently practical.

Further, if the action range of the ship is wide, the antenna 2 needs to be corrected. However, such correction is not always necessary and may be appropriately performed. If the correction is required, the initial setting may be performed. The received image becomes sharp again.

As described above, in this embodiment, each phase φ _{1 to} φ of the stepping motor 17 for one rotation of the rotary light shield 6.
₄ was excited once, but this can be doubled. That is, by doubling the speed increasing ratio,
Compatible with repeater motors for 0X. FIG. 4 is a plan view showing the shapes of the rotary light shielding plates 6a to 6d in this case. In the figure, the light-transmitting portions 7 have an arc angle of 67.5 degrees, and two light-shielding portions 6a to 6d are formed on the rotating light-shielding plates 6a to 6d with a 180-degree shift in the circumferential direction.

Further, the translucent portions 7 of the rotary light shielding plates 6a to 6d are attached to the shaft 6e so as to be displaced by 45 degrees.

The light transmitting portion 7 is not limited to an arc angle of 67.5 degrees exactly, and the phase shift of the rotary light shielding plates 6a to 6d is not limited to exactly 45 degrees. If the light-transmitting portion 7 of the rotary shading plates 6a to 6d is limited to 67.5 degrees, the four rotary shading plates can be attached to the shaft 6e at exactly 45 degrees. There is no need to shift each, 0 degrees, 45 degrees, 90 degrees, 135 degrees ± 2 each
It may be offset by 2.5 degrees, and there is room in the mounting of the rotary shading plate as a whole.

In the case where the rotary light shielding plates 6a to 6d are used, it is needless to say that the gear ratio of the gear device 5 or the gear device 20 needs to be changed if the repeater motor 4 and the stepping motor 17 are not changed. However, the present invention is characterized by solving the problem of speed-up ratio by the rotating light-shielding plate as described above, not by conversion of the gear device.

Further, in the present embodiment, the unipolar 1-2 phase excitation method is used as the excitation method of the stepping motor 17, but unipolar or bipolar one phase excitation or two phase excitation which is generally known as another excitation method of the stepping motor is used. It may be.

Among them, in the case of the unipolar one-phase excitation method, the rotary light shielding plates 6a to 6d are formed by forming the light transmitting portion 7 having an arc angle of 90 degrees as shown in FIG. 6d
The light-transmitting portion 7 is attached to the shaft 6e with a shift of 90 degrees.

Then, the stepping motor 17 is energized at the timing shown in FIG. In the case of this one-phase excitation, it is necessary that the phase difference of each phase is exactly 90 degrees, and therefore, there is a problem that precision is required for attaching the rotary light shielding plates 6a to 6d to the shaft 6e.

Further, in the case of unipolar two-phase excitation, the rotary light shielding plates 6a to 6d
As shown in FIG. 8 (a), a transparent portion 7 having an arc angle of 180 degrees is formed. Each of the rotary light shielding plates 6a-6b has a transparent portion 7
Are attached to the shaft 6e so as to have a phase difference of 90 degrees. Therefore, each phase of the stepping motor 17 is excited at the timing shown in FIG.

In addition, in the case of this two-phase excitation, the phase difference of each phase needs to be exactly 90 degrees, and there is no margin as in the case of 1-2 phase excitation. Therefore, the rotation shading plates 6a to 6d are mounted. There is a drawback that precision is required.

It is possible to double the number of times of excitation of each phase per one rotation of the rotary light shield 6 or more, as in the case of the above-described one-phase and two-phase excitation and the one-two-phase excitation.

That is, an arc angle of 33.75 is applied to each of the rotary light shielding plates 6a to 6d.
When four light transmitting parts 7 of 90 degrees are provided at intervals of 90 degrees, and the light transmitting parts 7 of the rotary shading plates 6a to 6d are attached to the shaft 6e with a shift of 22.5 degrees, The number of excitations of each phase per rotation can be quadrupled. That is,
Compatible with repeater motors for 90X.

Further, the translucent portion 7 is not limited to the arc angle of 33.75 degrees, and the phase shift of the rotary light shielding plates 6a to 6d is not limited to exactly 22.5 degrees. Part 7 is 2
The deviation may be in the range of 2.5 degrees or more and 45 degrees or less. what if,
When the light transmitting portions 7 of the rotary light shields 6a to 6d are limited to 33.75 degrees, it is not necessary to accurately attach the four rotary light shields to the shaft 6e by 22.5 degrees. The mounting considering only one sheet may be shifted by ± 11.25 degrees at the maximum, which allows the rotation shading plate to be mounted with a margin as a whole.

Further, as a method of multiplying the number of times of excitation of the stepping motor 17 by several times, in addition to changing the number of light transmitting portions of the rotary light shielding plates 6a to 6d and the speed of the rotary light shielding plates 6a to 6d as described above,
You may make it demonstrated below.

That is, an example thereof is shown in FIG. 9 (a), but only one rotating light-shielding plate 6a is fixed to the shaft 6e, and this rotating light-shielding plate 6a has a light transmitting portion 7 having an arc angle of 135 degrees. Have Then, four photointerrupters 9a to 9d of optical interrupters are arranged at intervals of 90 degrees on the periphery of the rotary light shield plate 6a. With this configuration, the same operation as that of the embodiment shown in FIG. 1 can be obtained.

The arc angle of the light transmitting portion 7 may be between 90 degrees and 180 degrees, as already described.

FIG. 9 (b) shows an example in which the number of times of excitation is doubled, and the light transmitting portion 7 is at 67.5 degrees (may be between 45 degrees and 90 degrees). Then, eight photo interrupters 9a to 9h are provided at intervals of 45 degrees, and the photo interrupters facing each other by 180 degrees are connected in parallel.

That is, this corresponds to a repeater motor for 180X.

Further, in order to quadruple the number of times of excitation, the translucent portion 7 has three
3. 16 degrees photointerrupters are provided at intervals of 22.5 degrees, 3.75 degrees (may be between 45 degrees and 22.5 degrees), and 4 photointerrupters for every 90 degrees are connected in parallel. For example, it is compatible with repeater motors for 90X.

From the above, the predetermined angular width of the transparent portion 7 and the transparent portion 7
In order to set the rotation speed of the stepping motor 17 with respect to the rotation speed of the repeater motor 4 by adjusting the number of optical interrupters 9a to 9d and the number of optical interrupters 9a to 9d, the number of optical interrupters is set to a constant value. A method of adjusting the predetermined angular width of the light section and the number of the light-transmitting sections (first method) and a method of keeping the number of the light-transmitting sections constant and maintaining the predetermined angle width of the light-transmitting section and the optical interrupter in that state. There are two methods of adjusting the number and the second method.

That is, in the first method, as shown in Table 1, the number of optical interrupters is fixed at four (one optical interrupter is arranged on each of the four rotary light-shielding plates), and 360X is set in advance. In order to correspond to (1), one translucent part having an angle width of 135 degrees is formed on each rotary light shielding plate, and in order to correspond to 180X, a translucent part having a predetermined angle width of 67.5 degrees. 2 are formed on each of the rotary light shielding plates, and in order to correspond to 90X, four light transmitting portions having a predetermined angular width of 33.75 degrees are formed on each of the rotary light shielding plates.

In addition, in the second method, as shown in Table 2, only one light-transmitting portion is formed on one rotating light-shielding plate, and in order to correspond to 360X, the angle of the light-transmitting portion is set. The width is 135 degrees, the number of optical interrupters is four, and in order to correspond to 180X, the predetermined angular width of the light transmitting portion is 67.5 degrees.
In order to set the number of optical interrupters to 8 and to correspond to 90X, the angular width of the light transmitting portion is 33.75 degrees, and the number of optical interrupters is 1.
The number is 6.

Therefore, for the desired speedup ratio of the repeater motor 4,
The rotation speed of the stepping motor 17 can be adjusted to a desired value without changing the gear ratio of the gear units 5 and 20 by appropriately adjusting the predetermined angular width of the light transmitting unit 7, the number of light transmitting units 7, and the number of optical interrupters. Can be set to.

Moreover, the stepping motor 17 can be excited by 1-2 phase.

(Effects of the Invention) As described above, according to the configurations of claims 1 and 2, the following effects are achieved.

A basic signal, which should be called a switching signal necessary to excite each phase of the stepping motor, is obtained from the rotary light shield and the optical interrupter rotated by the repeater motor, and this is applied to each phase excitation through the transistor. Since the required excitation signal is obtained, it is possible to provide an inexpensive device having a simple structure and sufficient practicality as compared with this type of device using the servo control method.

In particular, when the stepping motor is rotated at several speeds, the problem of speed-up ratio is solved by the relative relationship between the predetermined angular width of the light-transmitting portion of the rotary light shield and the number of light-transmitting portions and the number of optical interrupters. Therefore, it is possible to easily change the speed increasing ratio by replacing the rotary light shield instead of replacing the conventional mechanical gear.

Therefore, since it can be simplified without changing the mechanical gear mechanism, there is no torque fluctuation in the load of the repeater motor,
Further, there is no torque fluctuation in the load of the stepping motor. Further, the repeater motor model may be either a stepping motor or a synchro motor because the rotary light shield may be rotated according to the change of the gyro compass.
A repeater motor having a speed increasing ratio of 60X, 180X, 90X, etc. can also be used, and a versatile device can be provided.

Moreover, since the pulse signal of the stepping motor is formed using the rotary light shield and the optical interrupter, it has excellent responsiveness of start, stop, forward / reverse rotation, and the rotation angle and input pulse number of the stepping motor are perfect. And a reliable rotation speed is obtained.

Therefore, unlike the servo motor, there is no problem of gain compensation and phase compensation, feedback is not required, and open control can be used, so that the entire system becomes compact. Further, as a natural consequence of using the stepping motor, there is a self-holding force and a stop-holding torque even when stationary. Furthermore, when the servomotor, ordinary DC motor, or AC motor does not rotate due to inertia or a brake is required for uneven rotation, and the servomotor is stopped at the zero potential of the output of the comparison amplifier. As described above, the antenna can be rotated and stopped with high accuracy without the inconvenience that the influence of the load torque is large.

Further, according to the configuration of claim 3 or 4,
Since the predetermined angle width of the light transmitting portion formed on the rotary light shield and the arrangement of the optical interrupters are set so as to excite the 1-2 step phase of the stepping motor, the predetermined angle width of the light transmitting portion and the optical interrupter are set. The arrangement can be made to have a margin, and the manufacturing and assembling work can be facilitated.

Furthermore, the present invention can be used as an interface of a follower device of a repeater sub-indicator, which is an original gyrocompass, and the following effects can be obtained.

Whether the transmission method from the gyro compass is the step method or the synchronization method, and whether it is an AC signal or a DC signal, the frequency, voltage, and amplifier can be used without any problem. The sub-indicator can be unified with the stepping method, and a uniform sub-indicator can be manufactured. Moreover, even if the speed increasing ratio and the electrical specifications are different, these can be easily solved, so that the circuit design on the side of the sub-indicator becomes easy. For example, the interface and the like for connecting to the electronic circuit of the digital sub-supporter or other equipment, rather than the analog configuration using the stepping motor, are simplified.

As a result, it is possible to systematize the device that is combined with the gyro compass.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of an antenna automatic tracking device according to the present invention, FIG. 2 is a perspective view of a rotary light shield used in the antenna automatic tracking device, and FIG. FIG. 4 is a timing diagram showing the excitation timing of the stepping motor in the automatic tracking device, FIG. 4 is a plan view of the rotary light shielding plate in the case of obtaining the doubled excitation timing, and FIG. FIG. 6 is a conceptual diagram of a system in reception, and FIG. 6 is a plan view showing a positional relationship between the present device and a radio wave emission source for explaining the operation of automatic tracking.
FIG. 7 (a) is a plan view showing an embodiment of the rotary light shield plate in the case of one-phase excitation, and FIG. 7 (b) is a timing diagram showing the excitation timing of the stepping motor when the rotary light shield plate is used. FIG. 8 (a) is a plan view showing an embodiment of the rotary shading plate in the case of two-phase excitation, and FIG. 8 (b) shows the excitation timing of the stepping motor when the rotary shading plate of the same is used. Timing diagram, FIG. 9 (a) is a plan view showing an embodiment in which one rotary light shielding plate is used, and FIG. 9 (b) is a rotary light shielding for obtaining twice the number of excitations of the above embodiment. It is a top view which shows arrangement | positioning of a board and a photo interrupter. 4 ... Repeater motor, 6 ... Rotation light shield, 6a to 6d
...... Rotating light shield, 9a-9h …… Photo interrupter,
17 ... Stepping motor.

Claims (4)

[Scope of utility model registration request] 1. A repeater motor of a gyrocompass, a rotary light shield which is rotated by the repeater motor and blocks light except for a light transmitting portion having a predetermined angle width, and the rotary light shield is rotated in response to the rotation of the rotary light shield. An optical interrupter that receives an interruption of received light and outputs a signal corresponding to the interruption of the received light, an excitation circuit that excites a stepping motor in response to an output signal of the optical interrupter, and an excitation circuit that is driven by the excitation circuit. A stepping motor and an antenna mounting base that is rotated by the stepping motor. The rotating light blocking member includes a plurality of rotating light blocking plates that include the light transmitting portion and is rotated by the repeater motor. The optical interrupter is provided in each of the plurality of rotary light-shielding plates, and the predetermined angular width of the light-transmitting part and the number of light-transmitting parts of each rotary light-shielding plate are adjusted. Especially Therefore, the automatic tracking device for an antenna is characterized in that the rotation speed of the stepping motor with respect to the rotation speed of the repeater motor is determined. 2. A repeater motor of a gyrocompass, a rotary light shield which is rotated by the repeater motor and blocks light except for a light transmitting portion having a predetermined angle width, and the rotary light shield is rotated in response to the rotation of the rotary light shield. An optical interrupter that receives an interruption of received light and outputs a signal corresponding to the interruption of the received light, an excitation circuit that excites a stepping motor in response to an output signal of the optical interrupter, and an excitation circuit that is driven by the excitation circuit. A stepping motor and an antenna mounting base that is rotated by the stepping motor. The rotating light shield comprises a single rotating light shield plate having the light transmitting portion, and the optical interrupter rotates the optical interrupter. Rotation of the stepping motor with respect to the rotation speed of the repeater motor by adjusting the predetermined angular width of the light-transmitting portion and the number of the optical interrupters by providing a plurality of light-shielding plates with their phases shifted. An automatic antenna tracking device characterized by determining speed. 3. The light-transmitting portion of each rotary light-shielding plate has a phase angle higher than that of the light-transmitting portion formed on any one of the two rotary light-shielding plates that are provided out of phase with the rotary light-shielding plate. The automatic tracking device for an antenna according to claim 1, wherein the automatic tracking device is formed with a predetermined angular width that partially overlaps with each other. 4. The light-shielding portion of the rotary light-shielding plate has a predetermined angular width that is larger than the angular width between adjacent optical interrupters and smaller than the angular width between three adjacent optical interrupters in sequence. The automatic tracking device for an antenna according to claim 2.