JPH0413621Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a signal converter for a gyro repeater that obtains an output signal similar to that of a step-type gyro repeater from a synchronized gyro repeater.

``Prior art'' In conventional radars and direction finders, the indicated direction is generally set to the bow direction of the ship on which the radar or direction finder is installed, for example, as a reference direction, and the azimuth angle of the object detected by the radar is determined with respect to that reference direction. It was read from the angle scale and indicated the direction to be detected by the direction finder. Therefore, the direction of the detected object and the detection direction when north is the reference direction are unknown. For this purpose, the true bearing unit places a true bearing cursor on the display screen and mechanically rotates the true bearing dial using the output from the gyro repeater, controlling the direction of the true bearing cursor so that it points north on the display screen. Alternatively, the output of the gyro repeater was supplied to the northup circuit, and the display was rotated by the angle of the bow direction relative to true north, so that true north on the display surface was always facing upward.

By the way, conventional gyro repeaters are available in synchronized type and step type, depending on the gyro compass.
The coupling ratio differs depending on the repeater, with some repeaters rotating 360 degrees, some rotating 180 degrees, and some rotating 90 degrees or 36 degrees. Therefore, it is necessary to change the gear ratio of the gear that connects the true direction indicating cursor and the gyro repeater depending on the gyro compass and repeater used, which have different combination ratios, which is very inconvenient.

From this point of view, even if the type of gyro compass and the coupling ratio of the gyro repeater are different, it is possible to drive the stepping motor that drives the true direction indicating cursor simply by switching the switch.
Alternatively, a gyro interface that can provide a gyro repeater output to a north-up circuit has been proposed.

This gyro interface is used, for example, as shown in FIG. That is, the gyro compass 1
The gyro repeater 2 is driven by the gyro repeater 2, and the output of the gyro repeater 2 is sent to the gyro interface 3.
is supplied to The output of the gyro interface 3 is supplied to a true azimuth unit 4 to rotate a true azimuth indicating cursor, or is supplied to a northup circuit 5 so that the display is always made so that north is directly above.

Although not shown in the figure, the gyro interface 3 is provided with switches, and these switches can be used for the type of gyro compass 1 or for the gyro repeater 2.
The output of the gyro interface 3 drives the true bearing unit 4, and the northup circuit 5 It is possible to operate correctly.

However, synchronized gyro repeaters are rotated at a relatively high speed, and if the rotation period of the rotor becomes less than twice the period of the AC signal applied to the rotor, a signal with the correct waveform will be sent from the synchronized gyro repeater. is no longer obtained, and the gyro interface 3 also no longer operates correctly.
This fear is particularly likely to occur when the coupling ratio is so high that the rotor of a synchronized gyro repeater rotates 360 degrees for a 1 degree change in the gyro compass.

Not limited to this kind of gyro interface,
In a so-called electronic gyro repeater that electrically obtains a gyro repeater signal from a synchronized gyro repeater, if the rotor rotates at a high speed, a correct repeater signal cannot be obtained.

This invention provides a signal converter for a gyro repeater that can obtain a correct gyro repeater signal even when the rotor rotates at a high speed.

``Means for Solving the Problems'' According to this invention, three sensors are provided at equal angular intervals on the rotor axis of a synchronized gyro repeater. A rotating body is attached to the rotor shaft, and when the rotating body rotates once, one sensor is coupled only by half a rotation. Therefore, as the rotor rotates, signals are obtained from the three sensors that have a high level and a low level by half a period, and whose phases are sequentially shifted by one-third period. This sensor is a combination of a light emitting element and a light receiving element, and a rotating body opens and closes an optical path between the light emitting element and the light receiving element, or the sensor is a magnetic field detection element such as a Hall element, and the rotating body is a permanent magnet, etc. Various combinations of can be used.

Embodiment FIGS. 1 and 2 show an embodiment of a signal converter for a gyro repeater according to this invention. A plurality of columns 12 are erected within a frame 11 made of a plate bent into a U-shape, and a plate 13 is fixed onto the columns 12 to form a mounting base 14. Its mounting base 14
Inside, a synchronized gyro repeater, so-called a synchronized receiver 15, is mounted on a mounting base 14. A rotor shaft 16 of the synchronized gyro repeater 15 projects above the mounting base 14.

In this invention, three sensors 17a, 17b, and 17c are provided on the rotor shaft 16 at equal angular intervals. In this example, sensors 17a, 17b, 1
7c is a case where an optical sensor, a so-called photo interrupter is used, and the rotor shaft 1 is mounted on the mounting base 14.
They are fixed at equal intervals on the same circle centered at 6.

A rotating body 18 is attached to the rotor shaft 16, and the rotation of the rotating body 18 causes the rotation of one sensor.
The sensor is coupled only for half a rotation of one rotation of the rotary body 18, and one of the binary signals is output from the sensor. In this example, the rotating body 18 has a disk shape, and its 180
The radius of the angular range in degrees is the sensor 17a, 17b,
17c is larger than the radius of the circle in which it is placed,
In the other 180 degree range, sensors 17a, 17b, 1
7c, and the optical sensor 17
A rotating body 18 is configured to pass between each of the light emitting elements a, 17b, and 17c and the light receiving element.

The electrical circuit of the signal converter of this gyro repeater is shown in FIG. In this signal converter 21, a synchronized gyro repeater 15 includes a rotor 22 and a stator 23. The rotor 22 receives an AC signal that is applied to the rotor of the synchronized oscillator of the gyro compass 24, and the stator 2
A signal induced in the stator of the synchro oscillator of the gyro compass 24 is applied to the rotor 22.
rotates corresponding to the rotation of the gyro compass 24.

Each cathode of light emitting diode 25a, 25b, 25c as each light emitting element of sensors 17a, 17b, 17c is connected to ground terminal G, and each anode is connected to power supply terminal B through common resistor 26. Phototransistors 26a, 26b, as light receiving elements of the sensors 17a, 17b, 17c,
Each emitter of 26c is connected to the ground terminal G, and each collector is connected to the output terminals D ₁ , D ₂ , D _{3 ,} respectively, and to the power supply terminal B through resistors 27 a , 27 b , 27 c.

In this example, the output of the signal converter 21 of the gyro repeater of this invention is supplied to the gyro interface 3, and when the gyro coupling ratio is 360 times, the output of this converter 21 is used. This is the case. That is, the output terminals D ₁ , D ₂ , and D ₃ are the input terminals 31 of the gyro interface 3, respectively.
A, 31b, and 31c are connected to waveform shaping circuits 32a, 32b, and 32c, which also serve as polarity inversion. Waveform shaping circuits 32a, 32b, 32c
Each output side is a changeover switch 33a, 33b, 33
It is connected to each one of the fixed contacts P of c. Three output sides of a waveform conversion circuit 34 are connected to each fixed contact side of the changeover switches 33a, 33b, and 33c.
The waveform conversion circuit 34 receives a synchronized gyro repeater rotor signal when the coupling ratio is smaller than 360 times,
A stator signal is provided. Changeover switch 33
The movable contact side of a, 33b, 33c is a selector 35
The selection switch 36 can be controlled to select between the outputs of the changeover switches 33a, 33b, and 33c or the input 37 of the step type gyro repeater. Description of the portions subsequent to the selector 35 will be omitted.

According to the configuration described above, the rotating body 18 is connected to the sensor 1.
7a, 17b, or 17c, no light is received by the phototransistor 26a, 26b, or 26c, the collector output thereof becomes a high level, and the output of the waveform shaping circuit 32a, 32b, or 32c becomes a low level. , while the rotating body 18 is removed from the sensor, the output of the corresponding waveform shaping circuit is at a high level. Sensors 17a, 17b, 1
7c are arranged at intervals of 120 degrees, and half of one rotation of the rotating body 18 passes through each sensor, so the outputs of the waveform shaping circuits 32a, 32b, and 32c are, for example, as shown in FIGS. 4A, B, and C. Rotating body 1 as shown respectively.
8. Changes per revolution. In other words, a signal having a pulse width of half a period and whose phase is sequentially shifted by one-third period, that is, a signal similar to the output of a step type gyro repeater is obtained.

``Effects of the invention'' As stated above, according to this invention, by simply attaching three sensors and a rotating body rotated by the rotor to a synchro type gyro repeater, it is possible to create a gyro repeater of the same type as a step type gyro repeater. An output signal is obtained, ie a correct gyro repeater signal. Therefore, as shown in the example of Fig. 3, if the output of the converter of this invention is used, even when the rotor rotational speed is high, it can be input to the gyro interface and the true direction indication and northup operation can be performed correctly. I can do it.

[Brief explanation of the drawing]

Figure 1 is a front view showing an embodiment of this invention, Figure 2 is a front view showing an embodiment of this invention.
The figure is a plan view of Fig. 1, Fig. 3 is a connection diagram showing the electric circuit of the embodiment of this invention, Fig. 4 is a diagram showing an example of its operating waveform, and Fig. 5 is an example of application of the gyro interface. FIG. 15... Synchronized gyro repeater, 16
...Rotor shaft, 17a, 17b, 17c...Sensor, 18...Rotating body.

Claims (1)

[Claims for Utility Model Registration] Three sensors installed at equal angular intervals with respect to the rotor shaft of a synchronized gyro repeater; a rotating body that is coupled to the sensor for half a rotation during rotation; Repeater signal converter.