JPH0215804B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a device for detecting a position specified by a position indicator, and more particularly, the present invention relates to a device for detecting a position specified by a position indicator, and in particular, a device for detecting a position specified by a position indicator by using magnetostrictive vibration waves propagating through a magnetostrictive transmission medium having a magnetostrictive effect. The present invention relates to a position detection device that detects a specified position.

(Prior art and problems) Conventional devices of this type include, for example, the Japanese Patent Publication No. 56-32668.
As seen in the publication, from the time when an instantaneous magnetic field fluctuation is generated by a position indicator, magnetostrictive vibration waves generated in the magnetostrictive transmission medium due to this instantaneous magnetic field fluctuation propagate through the magnetostrictive transmission medium. Generally, a processing device calculates the time required for detection by a detection coil provided at the end of the sensor, and the position specified by the position indicator is detected from this calculated value. However, in such a configuration, it is necessary to connect the position indicator to the processing device by a signal line because it is necessary to notify the processing device of the timing at which the instantaneous magnetic field fluctuation is generated by the position indicator. This method has the disadvantage that the movement range and handling of the position indicator are severely restricted, and its application range is also narrow. In particular, when the position detection surface is planar, the range in which the position indicator can move becomes wider, requiring a longer signal line, which has the disadvantage of deteriorating operability.

(Objective of the Invention) The present invention improves these conventional drawbacks, and provides a position detection device that does not have a position indicator connected anywhere, is capable of highly accurate position detection, and has a wide range of applications. This is the issue.

(Principle of the Invention) When a magnetostrictive vibration wave propagates in a magnetostrictive transmission medium, a part of the mechanical vibration energy is converted into magnetic energy in a region where the magnetostriction vibration wave exists, and a local magnetic field fluctuation occurs. The magnitude of this magnetic field fluctuation increases as the coefficient (hereinafter referred to as electromechanical coupling coefficient) indicating the conversion efficiency from mechanical energy to electrical energy (or from electrical energy to mechanical energy) increases, and The coupling coefficient becomes maximum near a certain bias magnetic field. Therefore, an electromagnetic transducer, for example, a magnetostrictive transmission medium in which a coil is arranged, is provided with means for generating steady magnetism to the extent of increasing the local electromechanical coupling coefficient, and is not connected anywhere. Position indicator (hereinafter referred to as position designation magnetic generator)
When magnetism is applied, a large magnetic field fluctuation occurs when the magnetostrictive vibration waves that have propagated through the magnetostrictive transmission medium reach that position, and at that time, a large induced electromotive force (induced voltage due to the magnetostrictive vibration waves) is generated in the coil.
occurs. Therefore, by detecting the timing of generation of this large induced electromotive force, it is possible to know the time required for the magnetostrictive vibration wave to reach the position specified by the position specifying magnetic generator, and from this time it is possible to determine the specified position. This makes it possible to detect the position of the user.

Furthermore, the magnitude of the magnetostrictive vibration waves generated by applying an instantaneous varying magnetic field to the magnetostrictive transmission medium also increases as the electromechanical coupling coefficient increases. Therefore, if magnetism is applied from a position specifying magnetic generator to a certain portion of an electromagnetic transducer, such as a magnetostrictive transmission medium in which a coil is disposed, to an extent that increases the electromechanical coupling coefficient, it is possible to apply a pulse voltage to the coil. If applied,
Large magnetostrictive vibration waves are generated only in designated areas. Therefore, if the magnetostrictive vibration waves are detected with another electromagnetic transducer (coil) installed at the end of the magnetostrictive transmission medium,
When a large magnetostrictive vibration wave reaches the coil, the induced electromotive force (induced voltage due to the magnetostriction vibration wave) increases, and by detecting this timing, it is possible to detect the specified position as before. .

The present invention detects a position specified by a position specifying magnetic generator based on the above principle, and embodiments will be described below with reference to the drawings.

(Embodiment of the Invention) FIG. 1 is an explanatory diagram of the configuration of an X-direction position detection section in an embodiment of the invention. In the same figure, 1a
~1d are magnetostrictive transmission media made of a material having a magnetostrictive effect, and are arranged substantially parallel to each other along the X direction. Any ferromagnetic material can be used as the magnetostrictive transmission media 1a to 1d, but a material with a large magnetostrictive effect, such as an amorphous alloy containing a large amount of iron, is particularly desirable in order to generate strong magnetostrictive vibration waves. Further, it is preferable to use a material with a small coercive force that is difficult to magnetize even when a magnet is brought close to the material. Examples of amorphous alloys include Fe ₆₇ Co ₁₈ B ₁₄ Si ₁ (atomic%),
Fe ₈₁ B _13.5 Si _3.5 C ₂ (atomic %), etc. can be used. The magnetostrictive transmission media 1a to 1d have an elongated shape, and the cross section is preferably a rectangular thin strip or a circular linear shape, and in the case of a thin strip, the width is about several mm and the thickness is about several μm.
A thickness of about several tens of micrometers is easy to manufacture and has good characteristics. Amorphous alloys have a thickness of 20 to 50μ due to manufacturing.
Since a thin piece of m can be made, it is sufficient to cut it into a thin plate or a line. In this example, Fe ₈₁ B _13.5
A magnetostrictive transmission medium made of Si _3.5 C ₂ (atomic %) with a width of 2 mm and a thickness of 0.02 mm is used.

Reference numeral 2 denotes a first electromagnetic transducer in the X direction, such as a first coil in the X direction, disposed at one end of the magnetostrictive transmission media 1a to 1d. Each portion of the first coil 2 in the X direction (hereinafter also simply referred to as a coil) corresponding to each of the magnetostrictive transmission media 1a to 1d, respectively, is a coil that is wound in the opposite direction between adjacent coils. The magnetic flux generated by each of the coils 2a to 2d when a current is passed through the coil 2, or the voltage generated by each of the coils 2a to 2d when a magnetic flux in one direction is applied to the coil 2, is in the opposite direction. For this reason, pulse noise generated when a pulse current is passed through the coil 2, external induction, etc.
d and are weakened by canceling each other out. Although the number of windings is one in the illustrated example, it may be wound two or more times. This X-direction first coil 2 generates an instantaneous magnetic field fluctuation perpendicular to the coil surface, and the magnetostrictive transmission medium 1
It is used to generate magnetostrictive vibration waves in each of the winding parts a to 1d, and one end of the coil 2 is connected to the + terminal of a pulse current generator 3 that generates a pulse current sufficient to generate the magnetostriction vibration waves. and the other end is connected to that one terminal.

4 is a magnetic material for bias, and magnetostrictive transmission medium 1
This is for applying a bias magnetic field parallel to the longitudinal direction of the magnetostrictive transmission media 1a to 1d to the winding portions of the first coil 2 in the X direction a to 1d. The reason why a bias magnetic field is applied in this way is to enable generation of large magnetostrictive vibration waves with a small amount of current. That is, since the electromechanical coupling coefficients of the magnetostrictive transmission media 1a to 1d are maximum at a certain bias magnetic field as shown in FIG. By doing so, magnetostrictive vibration waves can be generated efficiently.

Further, in FIG. 1, 5 indicates magnetostrictive transmission media 1a to 1.
A second electromagnetic transducer in the X direction, for example, a second coil in the X direction, is arranged over a wide range of d, and is composed of coils 5a to 5d wound in correspondence with the magnetostrictive transmission media 1a to 1d, respectively. It's on. The winding direction of each coil 5a to 5d is the same (in this embodiment, left-handed winding).
The winding ends of coils 5a and 5d are connected to each other, that is, the coils 5a to 5d are connected in series, and the coils 5a and 5d are connected in series.
The beginnings of winding 5d are connected to the X-direction input terminals of the processor 6, respectively. Therefore, the adjacent coils 5a to 5d are connected in opposite polarities, and when a magnetic flux in one direction is applied to the coil 5, the voltage generated by each coil 5a to 5d or the current applied to the coil 5 is The magnetic fluxes generated from each coil 5a to 5d are arranged in opposite directions when flowing. Therefore, similar to the X-direction first coil 2, external induction and noise are canceled out and weakened between the adjacent coils 5a to 5d.

The winding pitch of each coil 5a to 5d is the first in the X direction.
It is wound gradually more densely from one end on the side close to the coil 2 toward the other end on the opposite side to compensate for the reduction in induced voltage due to attenuation of the magnetostrictive vibration waves. Generally, in order to increase the induced electromotive force, it is preferable to have a larger winding pitch. This X-direction second coil 5 is for detecting induced voltage due to magnetostrictive vibration waves propagating through the magnetostrictive transmission media 1a to 1d, and the area where it is wound serves as a position detection area. Again 7
is a magnetic body constituting the position specifying magnetic generator, and in this example a bar magnet with a diameter of 3 mm and a length of 50 mm is used, but the shape may be a plate, ring, corner, etc., or it may be an electromagnet. . In FIG. 1, an attempt is made to detect a specified position in the X direction using this bar magnet 7.

Now, in FIG. 1, the position designating bar magnet 7 is
It is placed on the magnetostrictive transmission medium 1a at a distance l in the X-axis direction from the center of the coil surface of the first coil 2 in the X direction with the pole facing down. It is assumed that it has been added to the section.

In such a state, when a pulse current is applied from the X-direction pulse current generator 3 to the X-direction first coil 2, an instantaneous magnetic field fluctuation occurs in the X-direction first coil 2, which causes the magnetostrictive transmission medium to 1a-1
A magnetostrictive vibration wave is generated at the winding portion of the first coil 2 in the X direction of d. This magnetostrictive vibration wave is generated by the magnetostrictive transmission medium 1a.
It propagates along the longitudinal direction of the magnetostrictive transmission media 1a to 1d at a propagation speed specific to ~1d (approximately 5000 m/sec).
During this propagation, conversion from mechanical energy to magnetic energy is performed at a portion of the magnetostrictive transmission medium 1a to 1d where the magnetostrictive vibration wave exists, depending on the magnitude of the electromechanical coupling coefficient at that portion.
Therefore, an induced electromotive force is generated in the second coil 5 in the X direction.

FIG. 3 shows an example of a temporal change in the induced electromotive force generated in the second coil 5 in the X direction, with the time t=0 when a pulse current is applied to the first coil 2 in the X direction. As shown in the figure, the amplitude of the induced electromotive force becomes large immediately after time t=0 and around _t1 to _t2 seconds after time _t0 , and becomes small at other times. The reason why the amplitude of the induced electromotive force becomes large immediately after time t = 0 is due to the electromagnetic induction effect between the first X-direction coil 2 and the second X-direction coil 5.
The reason why the amplitude of one cycle of induced electromotive force (induced voltage due to magnetostrictive oscillating waves) becomes large from t ₁ to _{t 2} is because the magnetostrictive oscillating waves generated in the winding portion of the first coil 2 in the X direction are transferred to the magnetostrictive transmission medium 1a. This is because the electromechanical coupling coefficient becomes large at that point as it propagates to the vicinity directly below the position specifying bar magnet 7. When the position specifying bar magnet 7 is moved along the longitudinal direction X of the magnetostrictive transmission medium, the induced voltage due to the magnetostrictive vibration wave also moves on the time axis accordingly. Therefore, time t ₀
By measuring the time from t ₁ to _{t 2} , it is possible to calculate the position in the X direction designated by the position designating bar magnet 7, that is, the distance l. As the propagation time for calculating the position, for example, as shown in Fig. 3, the time t ₃ when the amplitude of the induced voltage due to magnetostrictive vibration becomes smaller than the threshold value -E ₁ and the time t ₄ when it becomes larger than the threshold value E ₁ are used. Alternatively, the zero cross point _t5 may be used.

In addition, in FIG. 1, the bar magnet 7 for position designation is moved in parallel in the direction (Y direction) perpendicular to the longitudinal direction of the magnetostrictive transmission media 1a to 1d, and the bar magnet 7 for position designation is
When the N pole of is located above the magnetostrictive transmission media 1b to 1d, an induced voltage similar to that shown in FIG. 3 is obtained. This is because the connection polarities of the coils 5a, 5c and the coils 5b, 5d are opposite, but the winding directions of the coils 2a, 2c and the coils 2b, 2c are opposite. Therefore, it is possible to always extract the induced voltage due to the magnetostrictive vibration of the same polarity, and it is possible to improve the detection accuracy. In addition, since the winding directions of the coils 2a, 2c and the coils 2b, 2d are reversed, the induced voltages generated by the coils cancel each other out and become smaller, so that the voltages induced by the coils cancel each other out and become smaller, and the voltages are transferred from the first coil 2 in the X direction to the second coil 5 in the X direction. The directly induced induced voltage immediately after t ₀ in FIG. 3 also becomes smaller. Therefore, the distance between the first X-direction coil 2 and the second X-direction coil 5 can be narrowed, and the position detection area can be expanded accordingly. Generally, this effect can be obtained by reversing the winding direction or connection polarity of the first coil portion in the X direction between adjacent coils.

In addition, in the configuration shown in FIG. 1, when the position specifying bar magnet 7 is placed on the magnetostrictive transmission medium 1a, when the polarity of the position specifying bar magnet 7 or the polarity of the bias magnetic body 4 is reversed from that shown in the figure. , X-direction first coil 2a
Or, if the winding direction of the coil 5a is reversed,
It has been experimentally confirmed that when the first coil 2a or the coil 5a is connected in the opposite polarity in the X direction, the polarity of the voltage induced by the magnetostrictive vibration wave is reversed.

Therefore, when the coils 5b and 5d are wound in the opposite manner in FIG. 1, by reversing the winding of the coils 2b and 2d, it is possible to always extract the induced voltage due to the magnetostrictive vibration of the same polarity. In Fig. 1, the coils 5a to 5d are connected in series, and although the induced electromotive force is small, the coils 5a to 5d
It is also possible to have a configuration in which these are connected in parallel.

FIG. 4 is a configuration explanatory diagram of a Y-direction position detecting section used in combination with the X-direction position detecting section of FIG.
11a-11d are magnetostrictive transmission media arranged substantially parallel to each other along the Y direction; 12 is a Y-direction first electromagnetic transducer disposed at one end of the magnetostrictive transmission media 11a-11d; for example, a Y-direction first coil; 13 is a Y-direction pulse current generator that applies a pulse current to the Y-direction first coil 12 to simultaneously generate magnetostrictive vibration waves in each of the magnetostrictive transmission media 11a to 11d; 14 is a Y-direction pulse current generator that applies a pulse current to the Y-direction first coil 12; 1 coil 12
15 is a Y-direction second electromagnetic transducer, for example, a Y-direction second coil, which is disposed over a wide range of the magnetostrictive transmission media 11a to 11d. The Y-direction first coil 12 is composed of coils 12a to 12d, and adjacent coils are wound in opposite directions. Further, the Y-direction second coil 15 is composed of coils 15a to 15d, and each coil 15
The winding directions of a to 15d are all the same (in this example, left-handed winding), and the ends of coils 15a and 15b, the beginnings of winding of coils 15b and 15c, and the ends of windings of coils 15c and 15d are connected to each other, That is, the coils 15a to 15d are connected in series, and the beginning of winding of the coils 15a and 15d is at the processor 6.
is connected to the Y-direction input terminal. Also, each coil 1
The winding pitch of 5a to 15d is the first coil 1 in the Y direction.
It is wound gradually more densely from one end on the side close to 2 toward the other end on the opposite side.

Magnetostrictive transmission medium 11 around which the first coil 12 in the Y direction and the second coil 15 in the Y direction in FIG. 4 are wound.
a to 11d are the first coil 2 in the X direction and the second coil 5 in the X direction in FIG. 1, as will be detailed later.
is superimposed on the wound magnetostrictive transmission media 1a to 1d so as to be as close as possible to the magnetostrictive transmission media 1a to 1d, and is used to detect the position in the Y direction designated by the position designating magnetic generator 7. The structure and function of each part are as follows.
Since it is similar to the figure, its explanation will be omitted.

FIG. 5 is a plan view showing an example of the structure of the detecting section of the coordinate position detecting device, and FIG. 6 is a sectional view taken along the line A-A' in FIG. As shown in the figure, the magnetostrictive transmission medium 1 is housed in a reinforcing member 8, and the first X-direction coil 2 and the second X-direction coil 5 are wound around the reinforcing member 8, and these are made of non-magnetic metal. The magnetostrictive transmission medium 11 is inserted into a recess provided on the internal bottom surface of the case 100.
is housed in the reinforcing member 18, and the first coil 1 in the Y direction
2 and the Y-direction second coil 15 are wound around the reinforcing member 18, and these are superimposed on the X-direction detection section and fixed with an adhesive or the like as necessary.

One end of the first X-direction coil 2 and the first Y-direction coil 12 is grounded, and the other end is taken out to the outside via a conductive wire and connected to the X-direction pulse current generator 3 and the Y-direction pulse current generator 13. Further, one end of the second coil 5 in the X direction and the second coil 15 in the Y direction is grounded,
The other end is taken out to the outside through a conductor and connected to the processor 6. The bias magnetic bodies 4 and 14 are arranged in the metal case 1 so as to face the ends of the magnetostrictive transmission media 1 and 11.
Although they are fixed to the internal bottom surface of the magnetostrictive transmission medium 1, 11, they may be arranged above, below, or to the sides of the magnetostrictive transmission medium 1, 11. The metal case 100 is covered with a lid 101 made of non-magnetic metal.
The position specifying bar magnet 7 is moved above the .

FIG. 7 is a main part block diagram showing an embodiment of the processor 6. As shown in FIG. In the figure, first the computer 60
receives a signal indicating the start of measurement from a switch or the like (not shown), outputs a measurement preparation pulse via the input buffer circuit 61, and clears the counter 62. Next, the computer 60 outputs an X-direction start pulse, triggers the X-direction pulse current generator 3, and
A pulse current is applied to the first coil 2 in the direction, and the D flip-flop 6 is applied via the OR circuit 63.
4 is set to "1", and the analog switch circuit 65 is turned on. The output is an AND circuit 6
6 is opened, and the counter 62 receives the output pulse of the clock pulse generator 67 (the pulse repetition frequency is, for example,
100MHz).

The induced electromotive force generated in the second coil 5 in the X direction is amplified by a signal amplifier 68 and input to the (+) input terminal of a comparator 69. For example, the (-) input terminal of the comparator 69 receives a voltage Er corresponding to the threshold value _E1 in FIG.
is applied, and the comparator 69 is connected to the signal amplifier 68
While the output of is greater than the voltage Er, that is, when the positive polarity portion of the voltage induced by the magnetostrictive oscillation wave is detected, the output is set to a high level.

Now, since the output of the comparator 69 sets the D flip-flop 64 via the AND circuit 70,
The output closes the AND circuit 66,
The counter 62 stops counting. In this way, when the induced voltage due to the magnetostrictive oscillation wave appears in the second coil 5 in the X direction, the counter 62 stops the counting operation, so the elapsed time from the output of the X direction start pulse can be known as the digital value of the counter. can. In addition, this value is determined by the fact that the magnetostrictive vibration waves travel at a speed of approximately 5000 m/s.
This corresponds to the distance in the X direction from the coil 2 to the position specifying magnetic body 7. The X-direction position data thus obtained as a digital value is input to the digital number display 72 via the output buffer circuit 71 and displayed, or is input to the computer 6.
It will be input to 0 and processed.

Then, the computer 60 again outputs a measurement preparation pulse to clear the counter 62, and outputs a Y-direction start pulse to the Y-direction pulse current generator 13, D flip-flop 64, and analog switch circuit 73. Get location data.

FIG. 8 is an explanatory diagram of the configuration of an X-direction position detection section in another embodiment of the present invention. In the same figure, 2
a' to 2d' are first electromagnetic transducers in the X direction, for example, first coils in the X direction, which are disposed over a predetermined range at one end of the magnetostrictive transmission media 1a to 1d, and each coil 2
The winding directions of coils a' to 2d' are all the same (left-handed in this example), but the polarity of the connection is reversed between adjacent coils, and coils 2a to 2 in FIG.
Similarly to d, when a pulse current is passed through the coils 2a' to 2d', the voltages generated from the coils cancel each other out and become smaller. These coils 2a' to 2d' generate instantaneous magnetic field fluctuations to generate magnetostrictive transmission media 1a to 1.
d to generate magnetostrictive vibration waves,
The region wound around the magnetostrictive transmission media 1a to 1d becomes the region where magnetostrictive vibration waves are generated.

Reference numeral 9 denotes a reference position specifying magnetic generator used in place of the biasing magnetic body 4, and is used in place of the magnetostrictive transmission medium 1.
A bias magnetic field parallel to the longitudinal direction is locally applied to a to 1d to specify the generation position of magnetostrictive vibration waves generated in the magnetostrictive transmission media 1a to 1d.

The X-direction position detecting section is used in combination with a Y-direction position detecting section (not shown) having a similar first Y-direction coil and a magnetic generator for specifying a reference position. The coordinate values in the X direction and Y direction between the position specified in step 7 and the position specified by the reference position specifying magnetic generator are detected.
Other configurations and effects are shown in Figures 1 to 7 above.
This is similar to the embodiment shown in the figure.

Further, in the above embodiment, the first coils 2a' to 2 in the X direction
The winding pitch of d′ is the same, but the second
The coils 5a to 5d may be wound gradually closer to each other from the side closer to the other side, and in this case as well, it is possible to compensate for the decrease in the induced electromotive force due to the attenuation of the magnetostrictive vibration waves. can.

In the above embodiment, the first coil (electromagnetic converter)
was used to generate magnetostrictive vibration waves, and the second coil was used to detect magnetostrictive vibration waves. It is also possible to connect the first coil to the pulse current generators 3 and 13, and connect the first coil to the processor 6 for detecting magnetostrictive vibration waves.

Note that an element or device that converts magnetic field (magnetic flux) fluctuations into changes in voltage, current, etc., or converts changes in voltage, current, etc. into magnetic field fluctuations is referred to as an electromagnetic converter in the present invention. In the embodiment, a coil was used as the electromagnetic transducer, but it is not limited to this. In particular, if a magnetic head is used as the first electromagnetic transducer, the magnetic flux leaking to the outside will be extremely small, and it will be possible to determine the coordinate position with higher precision. Detection becomes possible.

(Effects of the Invention) As explained above, a plurality of magnetostrictive transmission media arranged substantially parallel to each other are superimposed so as to intersect substantially perpendicularly to the X direction and the Y direction, and the first electromagnetic transducer and the second An electromagnetic transducer is provided, and the time from when a pulse current is applied to one of the first electromagnetic transducer or the second electromagnetic transducer until an induced voltage due to magnetostrictive vibration waves appears in the other electromagnetic transducer is detected. Since the position is detected by using a magnet, the position indicator is not connected to any part of the device and is easy to handle, and the electromechanical coupling coefficient of the magnetostrictive transmission medium can be changed by several Oe only in a certain part to specify the position. Therefore, the position indicator does not necessarily need to be close to the detection surface, it may be spaced a few centimeters or more apart, or an object other than a magnetic material may be interposed, and even in these cases, the position indicator can be determined with extremely high resolution. The magnetic flux generated by the first or second electromagnetic transducer or the current generated in the first or second electromagnetic transducer can be detected for each magnetostrictive transmission medium or for two or more adjacent magnetostrictive transmission media. Since the pulse current is made to flow in the opposite direction each time, pulse noise generated when a pulse current is passed through the first or second electromagnetic transducer, noise mixed from the outside, etc. cancel each other out and become smaller. There are advantages such as more accurate position detection.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration of the X-direction position detection section in an embodiment of the present invention, FIG. 2 is a characteristic diagram of magnetic bias versus electromechanical coupling coefficient, and FIG. 3 is an induction generated in the second coil 5 in the X-direction. A line diagram showing an example of a temporal change in electromotive force. FIG. 4 is a configuration explanatory diagram of a Y-direction position detecting section used in combination with the X-direction position detecting section of FIG. 1. FIG. 5 is a diagram showing the detection of the position detecting device. 6 is a sectional view taken along the line A-A' in FIG. 5, FIG. 7 is a block diagram of main parts showing an embodiment of the processor 6, and FIG. FIG. 7 is an explanatory diagram of the configuration of an X-direction position detection section in another embodiment. 1a to 1d... magnetostrictive transmission medium in the X direction, 2...
X-direction first coil, 3...X-direction pulse current generator, 5...X-direction second coil, 6...processor,
7...Magnetic generator for position designation, 11a to 11d...
...Magnetostrictive transmission medium in the Y direction, 12...First coil in the Y direction, 15...Second coil in the Y direction, 13...Pulse current generator in the Y direction.

Claims (1)

[Scope of Claims] 1. In a coordinate position detection device that outputs the coordinate values of a position designated by a hand-held position indicator as digital values, a plurality of X-direction magnetostrictive transmission media arranged substantially parallel to each other. and a plurality of Y-direction magnetostrictive transmission media arranged substantially parallel to each other and stacked so as to intersect each other substantially perpendicularly, and arranged at one end of the plurality of X-direction magnetostriction transmission media. a first electromagnetic transducer arranged in the X direction and a first electromagnetic transducer in the Y direction arranged at one end of the plurality of Y direction magnetostrictive transmission media; a second X-direction electromagnetic transducer disposed over a wide range of the magnetostrictive transmission media; and a Y-direction second electromagnetic transducer disposed over a wide range of the plurality of Y-direction magnetostrictive transmission media. a second electromagnetic transducer comprising: a second electromagnetic transducer; a position indicator which is not connected to any other means and which is provided with means for generating steady magnetism to an extent that increases the local electromechanical coupling coefficient of the magnetostrictive transmission medium; a pulse current generator that applies a pulse current to one of the first electromagnetic transducer or the second electromagnetic transducer to generate magnetostrictive vibration waves in each of the magnetostrictive transmission media; Detecting the time it takes for the wave to reach the position specified by the position indicator of the magnetostrictive transmission medium until an induced voltage is generated in the other of the first electromagnetic transducer or the second electromagnetic transducer, and detecting the coordinate value of the specified position. a processor that outputs as a digital value, the direction of the magnetic flux generated by the first electromagnetic transducer or the current generated in the first electromagnetic transducer;
and the direction of the current generated in the second electromagnetic transducer or the magnetic flux generated by the second electromagnetic transducer is opposite for each magnetostrictive transmission medium or for each two or more adjacent magnetostrictive transmission media. 1. A coordinate position detection device comprising first and second electromagnetic transducers. 2. Either one of the first electromagnetic transducer or the second electromagnetic transducer, or the first electromagnetic transducer and the second electromagnetic transducer, is gradually magnetostricted from one side that is close to each other toward the other side. 2. The coordinate position detection device according to claim 1, wherein the coordinate position detection device is configured to have a tight electromagnetic coupling with a transmission medium. 3. The coordinate position detection device according to claim 1 or 2, further comprising a reinforcing member having a space for accommodating a magnetostrictive transmission medium. 4. The coordinate position detection device according to any one of claims 1 to 3, characterized in that the magnetostrictive transmission medium and the first and second electromagnetic transducers are housed in a non-magnetic metal case. . 5. The coordinate position detection device according to any one of claims 1 to 4, comprising a reference position designating magnetic generator disposed close to the first electromagnetic transducer. .