JPS62215880A - Magnetic responsive element - Google Patents

Abstract

PURPOSE:To enhance output pulse voltage and to miniaturize the titled element and to make the same insensitive to noise, by reversing the advance direction of an amorphous alloy wire at a plurality of places on the way of pulling around said alloy wire while twisting the same to one direction on an insulating substrate. CONSTITUTION:A magnetostriction amorphous alloy wire 2 twisted to one direction is stretched across fixing ends 3a, 3b on the surface of an alumina substrate 1 without loosening said wire. In this case, the alloy wire 2 is arranged so that the regions of a plurality of short wires are formed in a zigzag pattern by interposing direction reversal means 4a-4c between the fixing ends 3a, 3b. These fixing ends 3a, 3b are pins and the means 4a, 4c are similarly pins. When a magnetic field H acts on the element thus constituted in the direction by an arrow, a voltage pulse wherein voltage pulses between segments are added is generated between the fixing ends 3a, 3b. As a result, the obtained magnetic responsive element is small-sized, insensitive to noise and has high reliability.

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

The present invention relates to a magnetic sensing element using a magnetostrictive amorphous alloy wire that generates a pulse voltage in an alternating magnetic field.

[Prior art and its problems]

By placing a torsionally stressed Fe-Ni alloy Veegand wire in an excitation coil through which a current at a constant frequency is passed, voltage pulses are generated at both ends of the Wiegand wire in synchronization with the AC voltage of the excitation coil. elements have been known for a long time. Since the output state of the pulse changes depending on the strength of the external magnetic field acting on this element, the magnetic field can be sensed by capturing this change. However, crystalline 1R magnetic materials such as Wiegand wires have a small magnetostrictive effect, so they require an alternating current magnetic field with a high excitation amplitude, and the fact that sharp pulses cannot be obtained is a practical obstacle. On the other hand, magnetostrictive amorphous alloy wire has a large magnetostriction constant;
In addition, because of its high strength, it is easy to apply large torsional stress,
Minute intersection! It responds well to magnetic fields and generates sharp pulse voltages, making it suitable for use as a magnetically sensitive element. Such amorphous alloy wire is manufactured by ultra-rapid cooling from molten metal, and since torsional residual stress has already been generated in the surface layer during solidification, even if it is in the manufactured state, it will be exposed to an alternating magnetic field. , it is possible to generate a pulse voltage, but the residual stress during manufacturing does not occur with a uniform magnitude in the amorphous alloy wire, so this is not a preferable stress state for generating a pulse voltage. Therefore, sufficient output value cannot be obtained. Therefore, it is effective to anneale the amorphous alloy wire after manufacturing it to relieve the residual stress, and then apply appropriate torsional stress to produce a stable output at a high level as a magnetic sensing element. On the other hand, for such a magnetic sensing element, it is desirable to be able to obtain high voltage pulses with a small coil ?lH+t.
As described in 84-95, the magnitude of the pulse voltage is proportional to the length of the amorphous alloy wire, so in order to generate a large pulse voltage, it is necessary to use as long an amorphous alloy wire as possible and twist it. It is also known that applying stress is effective. However, making the amorphous alloy wire long goes against the demand for miniaturization of the device and is undesirable because it narrows the range of applications.To solve this problem, the inventors cut the amorphous alloy wire short. The required number of amorphous alloy wires are arranged parallel to each other on an insulating substrate and connected in series with another conductor.
The application is currently being filed as a No. However, the inventors' subsequent research revealed that boron (
Since it contains B) and silicon (Sl), it is inferior in metallurgical joining properties such as welding and brazing, so when joining in a twisted state, screw liquid always acts on the joint. However, it has been found that a highly reliable bonded state cannot always be obtained. Therefore, it is desirable to have a magnetically sensitive element that does not have any joints such as melting or brazing of amorphous alloy wires.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to provide a magnetic sensing element using a magnetostrictive amorphous alloy wire, which has a high output pulse voltage, is small in size, and has excellent reliability. be.

[Key points of the invention]

In the present invention, the amorphous alloy wire is twisted in one direction from one fixed end to the final fixed end on an insulating substrate, and the direction of the magnetic field is reversed at multiple points. A plurality of amorphous alloy wire regions are formed in which the twisting direction is reversed, and as a result, the scratchiness of the output voltage pulse is reversed. This makes it possible to obtain a small and highly reliable magnetic sensing element without the need for a magnetic sensor.

[Embodiments of the invention]

The present invention will be explained below based on examples. FIG. 1 is a perspective view of essential parts of a magnetically sensitive element according to the present invention. Figure 1 shows that, for example, FeB is deposited on the surface of an alumina substrate l.
A magnetostrictive amorphous alloy wire 2 made of -3i alloy is stretched between two fixed ends Q3a and 3b without loosening, and the amorphous alloy wire 2 is stretched between fixed ends 3a and 3b. Further, direction reversing means 4a, 4b, and 4c are interposed to form a plurality of short line regions in a zigzag shape. These fixed ends 3a, 3b are pins with slits, and the direction reversing means 4a, 4b, 4c are also similar pins, but without slits, and these pins are all embedded in predetermined positions in the base 1 in advance. . To fabricate this element, first insert one end of the amorphous alloy wire 2 into the slit of the embedded bottle of one of the fixed ends 3a.
A is fixed by caulking, and then the amorphous alloy wire 2
While twisting in one direction, pull it along the outer periphery of the pin of the direction reversing means 4a, continue twisting in the same direction until it reaches the outer periphery of the pin of the direction reversing means 4b, and then pull the pin 4c while twisting in the same direction. When the pin 3b at the other fixed end is reached, the other end of the amorphous alloy wire 2 is caulked and fixed through the slit 3b, and the amorphous alloy wire 2 is twisted in the same direction as a whole. Each pin has a short line area separated by each pin so that it is stretched in a zigzag pattern. The twist direction of the amorphous alloy vA2 is indicated by a dotted arrow. At this time, the positions and numbers of the fixed fas 3a, 3b and the embedded pins 4a, 4b, 4c serving as direction reversing means may be set arbitrarily so as to obtain the desired pulse voltage. Each pin can be firmly embedded in the base 1 by drilling a hole at a predetermined position in the base 1, metallizing the inner surface of the hole, inserting a pin made of, for example, phosphor bronze and soldering it. When a magnetic field H whose direction is indicated by a solid arrow acts on the element configured in this way, for example, regarding the pin 4a, the amorphous material divided between the line segments on both sides of the pin 4a, that is, between 3a and 4a, and between 4a and 4b, respectively. Voltage pulses having opposite polarities are generated in the alloy wire 2. As shown by e→■ in FIG. 1, this relationship is such that the polarity of the line segment 3a4a is negative for 3a and positive for 4a, and the polarity between the line segments 4a4b is negative for 4a and positive for 4b. This holds true for the other embedded pins 4b and 4c, which are means for reversing the direction of the amorphous alloy wire 2. Therefore, a voltage pulse is generated between 3a and 3b along the entire length of the amorphous alloy wire 2, which is the sum of the voltage pulses for each line segment. In addition, although FIG. 1 shows the case where the amorphous alloy wire 2 is arranged on one surface of the base 1, if necessary, the amorphous alloy wire 2 can also be provided in a zigzag pattern on the back surface of the substrate 1 in the same manner. It is possible to form an element in which several amorphous alloy wires are connected in series. FIG. 2 is a perspective view of a main part of a magnetically sensitive element showing another embodiment of the present invention, in which common members to those in FIG. 1 are denoted by the same reference numerals. In Fig. 2, for example, the amorphous alloy wire 2 is fixed while being twisted between two fixed ends 3a and 3b, which are embedded in a base l made of alumina and are each made of a pin having a slit, as in Fig. 1. However, the difference between Fig. 2 and Fig. 1 is that in Fig. 2, the amorphous alloy wire 2 with one end tightened at the fixed end 3a is twisted and stretched around the base l in a zigzag pattern. The other end is fixed by a fixed end 3b, and the means for reversing the direction of movement of the amorphous alloy wire 2 is by grooves 5a, 5b, 5c, and 5d provided in the thickness direction on both sides of the base 1. It is done. That is, in FIG. 1, the amorphous alloy wire 2 is arranged planarly with respect to the base 1, and in FIG. 2, it is arranged three-dimensionally. In the case of Fig. 2, the amorphous alloy wire 2 is also indicated by the dotted arrow.
The twisting direction is reversed when the board goes back and forth between the front and back sides, with reference to the direction H of the magnetic field, and as in the case of Fig. 1, the fixed end 3a
A voltage pulse corresponding to the entire length of the amorphous alloy vA2 is generated between and 3b. As shown in FIGS. 1 and 2, in the present invention, the amorphous alloy wire 2
The torsional stress of is used skillfully. That is, an amorphous alloy with respect to the magnetic field direction H! 1112, the twisted directions of the divided line segments are opposite to each other, but the polarity of the output voltage pulse is also reversed, so the direction reversing means 4a to 4c or 5
If you bend it at points a to 5d, stretch it in a zigzag pattern on the base 1, and fix the end, the twist direction will be reversed based on the magnetic field direction l (some line segments will be automatically obtained, resulting in Between both ends 3a and 3b of the amorphous alloy wire 2, the output voltage can be obtained by adding the voltages of each line segment.Therefore, both ◇ of one amorphous alloy wire 2 are provided at a close distance. Not only can the resulting device be compact without requiring a large installation surface, but also the torsional stress due to bonding is alleviated because the amorphous alloy wire 2 does not have a joint over its entire length. There is no change in characteristics over time or a decrease in yield due to bonding failure.
High reliability can be obtained. Furthermore, if a cylindrical or cylindrical insulator is used as a base and amorphous alloy wires are provided on its surface in a zigzag pattern using the method described above, the base can be used as a core material for winding a coil and generating a magnetic field. Another advantage is that they can be used in common. Note that an insulator is used for the base to prevent short circuits between wires.
In addition to ceramics such as alumina, glass epoxy and the like may be used, and composite materials of a conductive substance and an insulator may also be used as long as they meet the purpose of the present invention. [Effect of the invention] In order to increase the output voltage of a magnetically sensitive element using a magnetostrictive amorphous alloy wire to which torsional stress is applied, it is better to make the amorphous alloy wire longer, but the element cannot be made smaller. In addition, in order to solve the problem that connecting a large number of short amorphous alloy wires in series results in a lack of reliability at the joint, in the present invention, as explained in the embodiment, both ends are connected on the substrate. Fixed 1
A means for reversing the direction of the amorphous alloy gland, such as a plurality of pins, is interposed in the middle of the amorphous alloy wire, and the amorphous alloy wire is twisted and bent repeatedly, so that the entire amorphous alloy wire has a zigzag shape. As a result, the amorphous alloy wire stretched between the two identified ends is divided into several line segments whose output voltage polarity is reversed with respect to the magnetic field direction, even though the overall twist direction is the same. , the voltage pulse generated between the fixed ends of the image was able to generate a high voltage pulse in which the voltage between each line was added without being canceled out. This amorphous alloy wire is strong and easy to process signals in subsequent stages.Furthermore, since this amorphous alloy wire has no bonding points over its entire length, there are no bonding problems, resulting in high reliability.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a main part of a magnetic sensing element of the present invention in which amorphous alloy wires are arranged in a two-dimensional manner, and Fig. 2I2I is a perspective view of a magnetic sensing element of the present invention in which amorphous alloy wires are arranged in a three-dimensional manner. It is a perspective view of the main part shown. l: Base, 2: Amorphous alloy wire, 313b: Fixed end, 4a
, 4b, 4c: direction reversal means (bin), 5a,
5b, 5c.

Claims (1)

[Claims] 1) A magnetostrictive amorphous alloy wire whose both ends are fixed on an insulating substrate and twisted in one direction along its entire length is provided with a plurality of direction reversing means for stretching the wire in a zigzag pattern. A magnetically sensitive element characterized by being provided with. 2) A magnetically sensitive element according to claim 1, wherein the direction reversing means is a pin embedded on the base. 3) A magnetically sensitive element according to claim 1, wherein the direction reversing means is a groove formed on a side surface of the base.