JPH087232A - Magnetic sensor device - Google Patents

Abstract

PURPOSE:To obtain a magnetic sensor device of a high resolution type capable of detecting magnetic information under high precision and high sensitivity. CONSTITUTION:A permanent magnet 1 is housed and fixed in a casing 4, and a magneto-resistance element 2 is set up on the magnetic pole surface side of the permanent magnet l. The upper surface of the casing 4 is defined to a sensor detection surface and a magnetic flux implantation yoke 11 is provided between the sensor detection surface and the magneto-resistance element 2. The magnetic flux implantation yoke 11 is provided withe/function of a soft magnetic shape magnetic anisotropy plate and is arranged on the central part of the magneto-resistance element 2 in the erected state. A body 3 to be detected is run above the sensor detection surface and bias magnetic field passing from the permanent magnet 1 through the magneto-resistance element 2 is converged by the magnetic flux implantation yoke 11, and is implanted into the magnetic information in the body 3 to be detected, and the magnetic information is read and detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic material installed on a bill, such as a minute magnetic material for identifying a banknote, a magnetic code installed on a sheet-shaped medium such as an ID card, or a tag such as a gas cylinder. The present invention relates to a high resolution type magnetic sensor device for detecting information.

[0002]

2. Description of the Related Art A magnetic sensor device for detecting information installed on a bill or a magnetic card by a magnetic material is widely used in the field of information processing devices and similar fields. In this type of magnetic sensor device, as shown in FIG. 10 (a), a pair of magnetoresistive elements 2a and 2b are mounted on the upper surface of a permanent magnet (bias magnet) 1. 2b are connected in series as shown in FIG. 11, one side of this series circuit is connected to the power supply line, and the other side is connected to the ground line to form a voltage dividing circuit.
The signal take-out portion is drawn out from the serial connection portion of a and 2b.

This magnetic sensor device is installed on the traveling path (traveling space) of the body to be detected 3, and when the body to be detected 3 passes above the magnetoresistive element 2a while facing it, the bias magnetic field of the permanent magnet 1 is generated. As a result of concentrated passage through the magnetoresistive element 2a, the magnetic resistance of the magnetoresistive element 2a changes significantly, and a signal having an output waveform that is convex upward as shown in FIG. 10B is obtained from the magnetic sensor device. Next, when the detected body 3 comes to a position facing the magnetoresistive element 2b, this time, the bias magnetic field of the permanent magnet 1 concentrates and passes through the magnetoresistive element 2b side. The magnetic resistance of 2b is greatly changed, whereby a time-series signal having an output waveform which is convex downward is obtained from the magnetic sensor device. By analyzing the output signal of the magnetic sensor device, the information of the magnetic material installed on the paper-shaped medium such as a bill or a magnetic card can be read.

[0004]

However, the magnetic sensor device of this type, which conveys the detected body 3 along the traveling path, has the detected body 3 and the magnetoresistive element 2.
It is very difficult to keep the gap between a and 2b constant. As is well known, since the bias magnetic field generated from the permanent magnet 1 is of a dispersed type, if the gap spacing changes, the width of the bias magnetic field that traverses the detection object 3 changes, and as a result, the detection object runs continuously. Then, the output waveform of the magnetic sensor device is disturbed, the resolution is lowered, and the reliability of detection is impaired.

The applicant of the present invention has proposed a magnetic sensor device as shown in FIG. 8 by a patent application in order to prevent the deterioration of the resolution due to the variation of the gap distance. The proposed apparatus has a traveling space 5 for the body to be detected 3 in an upper and lower intermediate portion of a casing 4, and a permanent magnet 1 is arranged in the casing 4 below the traveling space. The magnetoresistive elements 2a and 2b forming a voltage dividing circuit are arranged on the upper surface of the magnetoresistive element through a substrate (not shown) as necessary, and the upper surfaces of the magnetoresistive elements 2a and 2b are exposed to the running space 5. ing.

In the housing 4 above the traveling space 5, a shape magnetic anisotropic plate 6 is arranged perpendicularly to the traveling path of the object 3 to be detected, and the bottom surface of the shape magnetic anisotropic plate 6 is magnetized. Resistance element 2a,
It faces between 2b.

By arranging the shape magnetic anisotropy plate 6 in this way, the bias magnetic field emitted from the permanent magnet 1 is concentrated on the shape magnetic anisotropic plate 6 so that the magnetic field is permanently applied between the magnetoresistive elements 2a and 2b. A magnetic barrier is created by the magnetic field directed from the magnet 1 to the shape magnetic anisotropic plate 6, and even if the gap distance between the detected body 3 and the magnetoresistive elements 2a and 2b passing through the traveling space 5 changes, the detected body 3 The width of the magnetic field that traverses the magnetic field does not fluctuate so that the resolution does not decrease.

However, as shown in FIG. 9, the magnetic field directed from the permanent magnet 1 to the shape magnetic anisotropic plate 6 does not always concentrate on the bottom surface of the shape magnetic anisotropic plate 6, and is emitted from the permanent magnet 1. Magnetic field bulges outward and is distributed (divergent)
Then, some of them enter the both side surfaces G and H of the shape magnetic anisotropic plate 6, and the resolution at this time is determined by the width of the EF across which the magnetic fields 8 and 9 traverse the traveling path 7 of the detected body 3. . If a dispersed magnetic field that enters both side surfaces of the shape magnetic anisotropic plate 6 is generated, the width of the EF that determines the resolution becomes large, and there is a problem that the resolution cannot be improved as expected.

Recently, high speed running of the detected body 3 has been attempted, and in order to perform such high speed running of the detected body 3, the detected body 3 and the magnetoresistive elements 2a, 2b are provided.
The gap between them must be large. For example, when the detected body 3 travels at a low speed, the gap between the detected body 3 and the magnetoresistive elements 2a and 2b can be reduced to, for example, 0.1 mm, but when traveling at a high speed, for example, 4 mm.
In order to prevent clogging between the object to be detected 3 and the magnetoresistive elements 2a and 2b, it is necessary to make a large gap, which inevitably disperses the magnetic field from the permanent magnet 1 toward the shape magnetic anisotropic plate 6. Since it has a shape, it bulges outward, which causes a problem that the resolution is lowered.

Further, in the case of reading a magnetic code installed on a tag such as a gas cylinder, in the magnetic sensor device having the structure shown in FIG. 8, a traveling space 5 is provided at the center of the housing 4, The magnetoresistive element 2 is provided on the lower surface side of the traveling space 5.
Since the a and 2b are arranged, the detection surface of the magnetoresistive elements 2a and 2b cannot be applied to the tag such as the gas cylinder, and it becomes difficult to read the magnetic code on the exposed surface of the tag or the like. In this respect, in the magnetic sensor device of the type shown in FIG. 10, the magnetic code can be read by making the detection surface sides of the magnetoresistive elements 2a and 2b face the tag. Since the magnetic field passing through the elements 2a and 2b is of a dispersed type, the resolution is lowered and there is a problem in reliability of code reading.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to maintain a high resolution even if the gap between the object to be detected and the magnetic detection surface is increased. Another object of the present invention is to provide a magnetic sensor device that can easily and accurately read and detect magnetic information formed on the surface of a tag or the like.

[0012]

In order to achieve the above object, the present invention is constructed as follows. That is, a first aspect of the present invention is provided with a magnet and one or more magnetically sensitive elements magnetically biased by the magnet,
In a magnetic sensor for detecting magnetic information of a detected body facing the magnetic sensitive element by a change in magnetic bias amount, a magnetic flux passing through the magnetic sensitive element from a bias magnet is concentrated between the magnetic sensitive element and the detected body. A magnetic flux injection yoke for pouring the magnetic information of the object to be detected is provided.

According to a second aspect of the present invention, a plurality of magnetic sensitive elements for independently detecting magnetic information of the object to be detected according to the first aspect of the present invention are arranged in an array, and each magnetic sensitive element for independently detecting the magnetic information is arranged. It is characterized in that an information detecting means for sequentially switching and extracting the detection signals is provided.

Further, a third invention is characterized in that, in the structure of the first invention or the second invention, the magnetic sensitive element is composed of a magnetoresistive element.

[0015]

In the first aspect of the invention having the above-mentioned structure, for example, when the information code is formed on the surface of the object to be detected by arranging the magnetic material and the non-magnetic material in an array, the magnetic code of the object to be detected. When the magnetic material of (1) faces the magnetic sensitive element, the magnetic field passing through the magnetic sensitive element from the bias magnet is concentrated on the magnetic flux injection yoke, and the magnetic field (magnetic flux) is concentrated and poured from the magnetic flux injection yoke onto the magnetic material of the information code. on the other hand,
Even when the non-magnetic material of the information code faces the magnetic sensitive element, the magnetic field from the bias magnet passes through the magnetic sensitive element and then flows through the magnetic flux injection yoke, but when the magnetic material faces the magnetic sensitive element. And when the non-magnetic material faces each other, the reluctance of the magnetic circuit including the magnetic code (magnetic information) changes sharply, and the output level of the magnetic detection signal of the magnetic sensitive element changes. , The magnetic information of the object to be detected is clearly read and detected.

In the second invention in which a plurality of magnetic sensitive elements for independently detecting the magnetic information of the object to be detected are arranged, the magnetic detection signals of the respective magnetic sensitive elements are sequentially switched by the information detecting means and taken out. As a result, multi-channel magnetic detection signal processing is performed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same reference numerals will be given to the same names as those in the conventional example and the proposed example, and duplicate description thereof will be omitted. FIG. 1 shows a first embodiment of the magnetic sensor device according to the present invention. In the figure, a permanent magnet 1 as a bias magnet is housed and fixed inside a housing 4, and a magnetoresistive element 2 as a magnetic sensitive element is fixed to the magnetic pole surface of the permanent magnet 1 directly or through a minute gap. ing.

The feature of this embodiment different from the proposed example is that the surface 10 side of the housing 4 constitutes the detection surface of the object 3 to be detected, and the magnetic flux injection yoke is provided between this detection surface and the magnetoresistive element 2. 11 is provided. The magnetic flux injection yoke 11 has the same shape as the shape magnetic anisotropy plate 6 of the proposed example, that is, is formed to have a dimension in the vertical direction larger than the plate thickness, and is embedded in the housing 4 to form the magnetoresistive element 2. It stands in the center.

The magnetic flux injection yoke 11 is made of a series of soft magnetic materials represented by permalloy, pure iron, silicon steel plate and the like. The magnetoresistive element 2 is made of InSb, InA.
It is composed of an appropriate semiconductor material having a high electron mobility such as s and GaAs.

This embodiment is constructed as described above, and its operation will be described below. As shown in FIG. 2, when the detected body 3 made of a magnetic material moves in the direction of the arrow and the detected body 3 faces the magnetoresistive element 2, the magnetic field generated from the permanent magnet 1 through the magnetoresistive element 2 ( After being converged by the magnetic flux injection yoke 11, the magnetic flux) is intensively poured into the detected body 3 from the upper end surface of the magnetic flux injection yoke 11. The path of the magnetic field from the permanent magnet 1 through the magnetoresistive element 2 to the object to be detected 3 is converged and concentrated in the magnetic flux injection yoke 11, so that the magnetic field does not become a dispersion type and the path is almost straight from the magnetic flux injection yoke 11. It will be poured into the to-be-detected body 3 through.

When the body 3 to be detected further moves in the direction of the arrow and the body 3 to be detected moves away from the opposing position of the magnetoresistive element 2, the action of injecting the magnetic field from the magnetic flux injection yoke 11 toward the body 3 to be detected is interrupted. .

As described above, in this embodiment, when the object 3 to be detected is opposed to the magnetoresistive element 2, the magnetic field passing through the magnetoresistive element 2 is intensively poured into the object to be detected, and the object 3 is detected. When separated from 2, the magnetic flux injection yoke 11
By stopping the injection of the magnetic field from, the strength of the magnetic field passing through the magnetoresistive element 2 is sharply switched depending on whether the detected body 3 faces the magnetoresistive element 2 or not. In other words, the reluctance of the magnetic circuit including the detected body 3 greatly changes depending on whether the detected body 3 faces the magnetoresistive element 2 or not, which causes the output level of the magnetic detection signal of the magnetoresistive element. As a result, the detection accuracy of the object to be detected can be significantly improved.

Further, for example, in the case where a magnetic material is formed by printing or the like on the surface of the detected body 3 formed of a non-magnetic material and magnetic information is given by a code, the magnetic material is used for the magnetoresistive element 2. , The magnetic field is intensively poured from the magnetic flux injection yoke 11 into the magnetic material, and the magnetic field injection action is stopped when the non-magnetic material faces the magnetoresistive element 2, so that the magnetic material is applied to the magnetoresistive element 2. The intensity of the magnetic field (magnetic flux) passing through the magnetoresistive element 2 is sharply switched between when the magnetic field is opposed to the magnetic field and when the non-magnetic material is opposed to the magnetic field, thereby enabling accurate reading and detection of the magnetic code.

Moreover, as shown in FIG. 2, since the magnetic field concentrated and injected from the magnetic flux injecting yoke 11 into the object 3 to be detected is not of a dispersed type, the distance between the sensor detection surface and the object 3 to be detected is set. Even if it is increased, the resolution of magnetic detection does not decrease, and it is possible to sufficiently meet the recent demand for high-speed running of the detected body 3.

Furthermore, according to this embodiment, the surface of the housing 4 is
Since 10 is used as the sensor detection surface, by applying this sensor detection surface in close proximity to a tag such as a gas cylinder, as described above, the magnetic information installed in the tag can be obtained by the concentrated injection effect of the magnetic field. It becomes possible to reliably detect and, as in the example of the proposal shown in FIG.
It becomes very easy to read the magnetic installation information of the tag or the like, which was difficult with the magnetic sensor device having the configuration in which the traveling passage 7 of the detected object 3 is provided in the middle part of the above.

FIG. 3 shows various circuit configurations of the magnetoresistive element 2 arranged on the magnetic pole surface of the permanent magnet 1. In FIG. 1A, one magnetoresistive element 2 is installed on the upper side of the permanent magnet 1, and both ends A ′ of this magnetoresistive element 2 are arranged.
The magnetic detection signal of the magnetoresistive element 2 is taken out by the voltage between B '.

In FIG. 1B, a magnetic resistance element 2 for magnetism detection and a dummy magnetic resistance element 2'are connected in series, and a magnetic resistance element similar to the circuit shown in FIG. The differential output between the resistance elements 2 and 2'is taken out as a magnetic detection signal of the magnetoresistance element 2. In this example, the dummy magnetoresistive element 2 ′ is usually installed at a position that is not affected by the magnetic information of the detected body 3.

In FIG. 3C, a resistor 19 is used in place of the dummy magnetoresistive element 2'shown in FIG. 3B. Also in the case of (c), the detection signal of the magnetic information of the magnetoresistive element 2 is extracted from the signal extraction lead A. This magnetic detection signal is obtained by extracting the applied power supply voltage of B as a voltage-divided output (differential output) between the resistance value of the resistor 19 and the resistance value of the magnetoresistive element 2.

FIG. 4 shows various examples in which the magnetoresistive element 2 is arranged in multiple channels. (A) in the figure
Is a multi-channel configuration in which a plurality of magnetic sensor devices having the configuration of the first embodiment are arranged in an array, and FIG. 1B shows a plurality of permanent magnets 1 in one housing 4. Are arranged in a multi-channel manner, and FIG. 1C shows that one permanent magnet 1 is housed and fixed in one housing 4, and the magnetic pole surface of this one permanent magnet 1 is A plurality of magnetoresistive elements 2 are arranged to form multiple channels.

In this multi-channel magnetic sensor device, for example, as shown in FIG. 5, the detection signals A _{1 to} A ₄ of the magnetic information of each channel are sequentially and selectively switched by switching the switches of the switch group 12. The signal is extracted in the form of a series signal, and desired signal processing is performed. In this embodiment, the switch switching of the switch group 12 is performed by the switch switching control unit 13, and an on / off switching scan signal of each switch is added to the switch group 12 from this switch switching control unit 13, and this switch scan signal is used. , The switches of the switch group 12 are automatically switched, and the detection signals A _{1 to} A ₄ of the magnetic information of the magnetoresistive element 2 of each channel are independently taken out as the voltage between the terminals A'B '. In addition, in this embodiment, the switch group 12 and the switch switching control unit 13 constitute information detecting means.

FIG. 6 schematically shows an example of detection of magnetic information of a tag 14 as a detected object provided in a gas cylinder or the like, using a multi-channel magnetic sensor device. The magnetic information placed on the tag 14 is given in the form of a code. That is, the tag 14 is made of a magnetic material, and the through hole is provided at a predetermined information position of the tag 14.
By arranging the magnetic part 16 in which 15 is opened and the through hole 15 is not opened and the through hole 15, the gas type name of the gas cylinder, the date of manufacture, the date of gas replacement, the number of times of gas replacement, etc. The desired information is provided to the tag 14 in code form.

By applying the detection surface of the multi-channel magnetic sensor device to the tag 14 so as to closely face it, the bias magnetic field from the permanent magnet 1 is magnetically applied from the magnetoresistive element 2 side facing the magnetic portion 16 of the information code. After passing through the resistance element 2, it is converged by the magnetic flux injecting yoke 11 and intensively poured into the magnetic portion 16. On the other hand, from the side of the magnetoresistive element 2 facing the through hole 15, the magnetic field passing from the permanent magnet 1 through the magnetoresistive element 2 to the magnetic flux injection yoke 11 toward the through hole 15 is transmitted through the through hole 15.
To avoid the magnetic field toward the magnetic part 16 and the through hole.
The distribution pattern of the magnetic field toward 15 is different. That is, through hole
The magnetoresistive element 2 facing the magnetic portion 15 has a magnetic flux density higher than that of the magnetoresistive element 2 facing the magnetic portion 16 because magnetic saturation and reluctance in the magnetic circuit including the tag 14 are improved.
The magnetic resistance of the magnetoresistive element facing the magnetic hole 16 is smaller than that of the magnetoresistive element facing the through hole 15, and the magnetoresistive change of the magnetoresistive element 2 facing the through hole 15 is smaller than that of the magnetoresistive element facing the magnetic portion 16.

As described above, the magnetic flux densities passing through the magnetoresistive element 2 facing the magnetic portion 16 and the magnetoresistive element 2 facing the through hole 15 are clearly different from each other, and a plurality of magnetoresistive elements 2 are detected. By switching the signals in time series and extracting the signals, the code of the magnetic information set on the tag 14 can be accurately detected with high accuracy.

In this embodiment, the magnetic field from the permanent magnet 1 to the magnetic portion 16 through the magnetoresistive element 2 is changed to the magnetic flux injection yoke.
Since the magnetic field is converged and concentrated at 11, even if there is a large gap between the surface of the tag 14 and the sensor detection surface of the multi-channel magnetic sensor device, the magnetic field from the magnetic flux injection yoke 11 to the magnetic portion 16 is of a distributed type. Instead, it is possible to detect magnetic information with high resolution because the concentrated injection is straight.

FIG. 7 shows a multi-channel magnetic sensor device in which the magnetoresistive elements 2 are arranged in a two-dimensional matrix.
9 illustrates an example of detecting magnetic information of the tag 14. The tag 14 may be formed of a magnetic material or may be formed of a non-magnetic material. When the tag 14 is formed of a magnetic material, the through hole 15 is formed as in the case shown in FIG.
Magnetic information can be set by combining the through hole 15 and the magnetic portion 16. When the tag 14 is a non-magnetic material, a code is printed on the surface of the tag 14 using magnetic ink or the like. Alternatively, the magnetic information can be set by sticking a magnetic material on the surface of the tag 14 with a film or the like formed with the magnetic information.

Even in the two-dimensional matrix multi-channel magnetic sensor device as shown in FIG. 7, the sensor detection surface of the multi-channel magnetic sensor device is applied to the tag 14 in which magnetic information is installed in the two-dimensional matrix. Then, as in the case shown in FIG. 6, the magnetic information set on the tag 14 can be accurately detected under high resolution.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in each of the above embodiments, the magnetic sensitive element is composed of a magnetoresistive element (including a magnetic thin film magnetoresistive element), but the magnetic sensitive element of the present invention is composed of another magnetic detecting element such as a Hall element. May be.

Further, in the above embodiment, the magnetic flux injection yoke 11 is arranged opposite to the central portion (central portion) of the magnetoresistive element 2.
The magnetic flux injection yoke 11 may be arranged directly above the magnetoresistive element 2, that is, within the area of the magnetoresistive element 2.
It does not necessarily have to be arranged in the center of the element 2.

[0039]

According to the present invention, the magnetic flux injection yoke for concentrating the magnetic flux passing through the magnetic sensitive element from the bias magnet to the magnetic information of the object to be detected is provided between the sensor detection surface and the magnetic sensitive element. The magnetic field from the magnetic flux injecting yoke to the object to be detected is not a distributed type but a convergent and concentrated straight magnetic field, and the straight state of the magnetic field is maintained even if the distance between the sensor detection surface and the object to be detected becomes large. Therefore, the detection resolution of the magnetic information is significantly improved, and the magnetic information of the detected object can be accurately detected with high accuracy and high sensitivity.

Further, even when magnetic information is provided in a code form by arranging magnetic materials in an array, the magnetic field directed from the bias magnet to the magnetic information of the object to be detected through the magnetic sensitive element is as described above. Since it is focused on the magnetic flux injecting yoke and concentrated, so even when a plurality of magnetic sensitive elements are arranged in an array to form multiple channels,
Interference between the magnetic field passing through the magnetic sensitive element on one side and the magnetic field passing through the magnetic sensitive element on the other side is prevented, and so-called crosstalk between the magnetic sensitive elements can be effectively prevented.

Further, in the present invention, since the magnetic flux injection yoke is provided on the side of the magnetic sensitive element that is on the inner side of the sensor detection surface, the outside of the sensor detection surface can be made into a free space. By setting the free space as the traveling space of the detected object, it becomes possible to detect the magnetic information of the detected object traveling in this traveling space, and the sensor detection surface is
For example, by closely facing a tag on which magnetic information such as a gas cylinder is installed, it is possible to accurately read and detect the magnetic installation information on the tag.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a magnetic sensor device showing a first embodiment of the present invention.

FIG. 2 is an explanatory view of a magnetic detection function of the magnetic sensor device of the embodiment.

FIG. 3 is an explanatory diagram of a circuit configuration example of a magnetoresistive element in the example.

FIG. 4 is an explanatory diagram of various configuration examples of a multi-channel type magnetic sensor device according to the present invention.

FIG. 5 is a circuit explanatory diagram showing an example of capturing a magnetic information detection signal of the multi-channel magnetic sensor device in the present embodiment.

FIG. 6 is an explanatory diagram showing an example of detection of magnetic information of a tag using the multi-channel type magnetic sensor device in the present embodiment.

FIG. 7 is an explanatory diagram of a detection example of magnetic information set on a tag by a multi-channel type magnetic sensor device in which magnetic resistance elements are arranged in a two-dimensional matrix.

FIG. 8 is an explanatory diagram of a magnetic sensor device previously proposed by the present inventor.

9 is an explanatory diagram of an operating state of the proposed apparatus shown in FIG.

FIG. 10 is an explanatory diagram of a conventional general magnetic sensor device.

FIG. 11 is a circuit diagram of a voltage dividing circuit of a magnetoresistive element.

[Explanation of symbols]

 1 Permanent Magnet 2, 2a, 2b Magnetoresistive Element 3 Detected Object 4 Case 11 Magnetic Flux Injecting Yoke 12 Switch Group 13 Switch Switching Control Section

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Claims (3)

[Claims] 1. A magnet and one or more magnetic sensitive elements magnetically biased by the magnet are provided, and magnetic information of an object to be detected facing the magnetic sensitive element is detected by a change in the amount of magnetic bias. In the magnetic sensor described above, a magnetic flux injection yoke for concentrating a magnetic flux passing through the magnetic sensitive element from the bias magnet and pouring it into the magnetic information of the detected body is provided between the magnetic sensitive element and the detected body. Magnetic sensor device. 2. A plurality of magnetic sensitive elements for independently detecting magnetic information of an object to be detected are arranged in an array, and information detecting means is provided for sequentially switching and extracting detection signals of the respective magnetic sensitive elements for independently detecting the magnetic information. The magnetic sensor device according to claim 1, which is provided. 3. The magnetic sensor device according to claim 1, wherein the magnetic sensitive element is a magnetoresistive element.