JPS6014115A - Compass - Google Patents

Abstract

PURPOSE:To realize a small-sized and high-capacity compass by arranging a coil, to which a certain signal is applied, and a detecting coil around a long-sized magnetic element whose magnetic characteristic is changed in accordance with a change of the bearing of an external magnetic field and discriminating the bearing with the signal of the detecting coil. CONSTITUTION:When an input current 4 having a specific frequency is flowed to an exciting coil 2, a ribbon 1 consisting of an amorphous alloy is in the resonance state, and a current 5 having the same frequency is generated in a detecting coil 3. The phase of the output current 5 in the case where the other side 1b of the ribbon is directed to the northern hemisphere is different from that in the case, where the side 1b is directed to the southern hemisphere, by 180 deg.. That is, when the other side 1b of the ribbon 1 directed to the north is rotated clockwise around one side 1a, the phase is not changed but the current value is reduced according as the other side 1b gets more eastern; and thereafter, when the other side 1b is rotated furthermore and is directed to the south, the phase is changed by 180 deg., and the current value is increased according as the other side 1b gets more southern. Consequently, a bearing is discriminated by the current value and the change of the phase of the detecting coil 3.

Description

[Detailed description of the invention] This is related to

Conventionally, in order to know the direction of a moving body such as a ship, a magnetic compass that uses a magnetic needle or a gyro compass that applies the principle of a rotating body has been used.

The magnetic compass has the advantages of not requiring a power source, being inexpensive, robust, and easy to handle. However, the magnetic compass has deviations and self-differences, and because the magnetic needle fluctuates due to external vibrations and cannot follow changes in direction that have a cycle faster than its own natural cycle, it is not possible to determine the exact direction. Ta. Furthermore, it has been difficult to extract appropriate electrical signals containing azimuth information, making it almost impossible to couple them to navigation control systems or the like.

On the other hand, a gyro compass always shows the true direction.
Although it is easy to connect with a navigation control system, etc., it requires a relatively large capacity power supply, is extremely expensive and large, and also takes a long time (90 to 120 minutes) from the time the TSM is turned on until it can be used. There were disadvantages such as requiring a lot of work and being difficult to handle.

In order to eliminate the above-mentioned conventional drawbacks, the present invention disposes two coils at intervals in the longitudinal direction around a long magnetic element whose magnetic properties change depending on the direction of an external magnetic field. A predetermined electrical signal is applied to one coil, and the direction is determined from the electrical signal and the detection signal taken out from the other coil.
The goal is to create a high-performance compass that can be easily connected to navigation control systems and the like.

First, the operating principle of the compass of the present invention will be explained with reference to FIGS. 1 and 2. In the figure, 1 is a long magnetic element 2 whose magnetic properties change depending on the direction of an external magnetic field, such as a ribbon made of an amorphous alloy, and 2 is a coil (2) that applies a predetermined electric signal.
Hereinafter, it will be referred to as an excitation coil. ), 3 is a coil for extracting a detection signal (hereinafter referred to as a detection coil).

The ribbon 1 is bent approximately at right angles near its center, and -
The side 1a is arranged vertically and the other side 1b is arranged horizontally. Furthermore, the-
An excitation coil 2 is arranged around the side 1a, and a detection coil 3 is arranged around the other side 1b.

When an input current 4 of a specific frequency shown in FIG. 2 is applied to the excitation coil 2, the ribbon 1 becomes resonant, and a current 5 of the same frequency is generated in the detection coil 3.

Incidentally, the phase of the output current 5 differs by 180 degrees when the other side 1b of the ribbon 1 faces the northern hemisphere and when it faces the southern hemisphere.

To explain this in more detail, when the other side 1b of the ribbon 1, which initially faced north, is rotated to the right mb with one side 1a as the center, as it goes east, the phase does not change, but the current value decreases (seconds). The output current 5') becomes almost 0 just to the east. Then, if you rotate it further and point it even slightly south, the phase will suddenly change by 180 degrees and the output current 5'), and as you get closer to the south, the current value will increase (output current 5').
').

Therefore, the direction can be determined from the current value of the output current of the detection coil 3 and the change in phase difference with the input current.

FIGS. 3 and 4 show an embodiment of the present invention, in which orientation is determined by using a ribbon and a detection coil without rotating the ribbon. That is, in the figure, 11, 12, 13, 14, 15, 16
1 amorphous alloy ribbon, 20 excitation coils, 3
1゜32. 33, 34, 35, 36 are detection coils, 41
42 is a signal generator, 42 is a multiplexer, 43 is a bidet cutter amplifier, 44 is a phase detector, 45 is a p-bus filter, 4
6 is a comparator, and 47 is a counter.

The ribbons 11, 12, 13, 14, 15.degree. 16 are each bent at a substantially right angle near the center thereof, and have negative sides 11a, 12a, 13a.

14Zl, 15a, 16a are arranged vertically together,
Other sides 11b, 12b, 13b, 14b.

15b and 16b are horizontally arranged at equal angles (here, 60 eaves). Excitation coil 20 has one side 11
(1, 12a, 13a, 14a.

15n and 16a, and the body detection coil 3
1, 32, 33, 34, 35, 3 (i is the other side 1
lb, 12b, 13b, 14b.

It is arranged around 15b and 16b.

A current of a specific frequency is inputted to the excitation coil 20 from the signal generator @E41, and the output currents of the detection coils 31 to 36 are sent to the multiplexer 42, respectively. Further, a predetermined sampling signal is applied to the multiplexer 42 from the signal generator @#41, and a clock pulse of 360 times the sampling period of the sampling signal (in this case, the resolution of the compass is 1 degree).

) is added to the counter 47. Also, the phase detector 4
4 is applied with a pulse having the same phase and period as the current applied to the excitation coil 20.

Then, the detection coil 31 starts sampling, and at the same time the counter 47 starts, and the detection coils 31 and 32 start sampling.
．． If the counter 47 is stopped by the pulse of the comparator 46 when the current from ...... becomes 0,
The counted value will indicate the east direction.

FIG. 5 shows another embodiment of the invention. In the figure,
50 is an amorphous alloy ribbon, 60 is an excitation coil,
Reference numerals 71, 72, and 73 are detection coils, and one side 50a of the ribbon 50 is arranged vertically, and the other side 50b is formed into a substantially circular shape and is arranged horizontally. Excitation coil 60
are arranged around the negative side 50a, and the detection coils 71.
The riffs 2.73 are arranged at equal intervals around the other side sob, so that the directions of the coils are at a constant angle to each other. Therefore, a current of a specific frequency is input to the excitation coil 60, and each detection coil 71. The direction can be determined by detecting the current value of the output current of E-72.73 and the phase difference between the input current and (1). As explained above, the present invention has the following effects. ■ ■ Since there are no moving parts, the sensor is not affected by vibrations in the location, and can follow sudden changes in direction, making it possible to measure direction with high accuracy. ■ Because it is small, lightweight, and robust, it can be installed in any location without adverse effects other than earth's magnetic field, and it can be configured to minimize deviations. The sensor section consisting of a magnetic element and a coil and the position determination section can be installed separately, enabling mote sensing, and the distance between them can be freely set.

Since the direction can be extracted directly as an electrical signal, it is easy to combine with navigation +1iI11 systems, etc.

Since it is composed of inexpensive magnetic elements, a small number of coils, and a simple electric circuit, it can be achieved at a very low price and with low power consumption.

Direction measurement is possible immediately after turning on the power.

Install multiple sensor sections and perform LLN using a microcomputer.
1II+C, the deviation can be further reduced.

Correction values related to deviations are compiled into a database and dynamic correction is made to further increase accuracy. Seconds can be used to form a night compass using an LED display board, etc., and a recording type copass can be constructed by connecting a printer, etc. .

Due to the above effects, it can be used for the following purposes.

■ Yacht, motor) Ic -), small pear boat such as a small fishing boat nn0 ■ Self! IIIF1 especially those with maps.

■ Flying objects such as airplanes and missiles.

[Brief explanation of drawings]

The drawings are for explaining the present invention. Figure 1 is a perspective view of the sensor section for explaining the operating principle of the compass of the present invention, and Figure 2 shows the input terminal of the excitation coil and the output current of the detection coil. Graphs @ Figure 3 and Figure 4 ζ show one embodiment of the present invention, Figure 3 is a perspective view of the sensor section, Figure 4 is a block diagram of the direction determination section, and Figure 5 is another embodiment of the present invention. It is a perspective view of the sensor part of an Example. 11.12,13,14,15,16...Amorphous alloy ribbon, 20...Excitation coil, 31.32,3
3, 34, 35, 36...Detection coil, 41...Signal generator, 42--Multiplexer, 43--Video amplifier, 44--Phase detector, 45...Low-pass filter, 46... Comparator, 47...Counter. Patent Applicant Wacom Co., Ltd. Representative Patent Attorney Yoshitaka Yoshida (and 1 other person) Engraving of the drawings (no changes to the contents! Figure 1 Figure 2 Figure 3 Figure 4 Figure 41) Sodo Utahan Figure 5 7. Written amendment (voluntary) July 8, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 2 Relationship with the case of a person who corrects the name of the invention Conha0s8?II1 Address of patent applicant Oaza Kan, Ageo City, Saitama Prefecture 1342-3 Tani Tohoku-dori
Name Wacom Co., Ltd. Representative Furu 1) Former male 4 Agent 105 Telephone (01) 608-9866 Address 1st Okana Building, 2-7-9 Toranomon, Minato-ku, Tokyo
L.

Claims (1)

[Scope of Claim] A long magnetic element whose magnetic properties change according to changes in the direction of an external magnetic field, two coils disposed around the magnetic element at intervals in the longitudinal direction, and the coil. 2. A compass, comprising means for applying a predetermined electrical signal to one of the coils and determining the direction from the electrical signal and a detection signal taken out from the other coil.