JP6475015B2 - Magnetic line sensor - Google Patents

Description

  The present invention relates to a magnetic line sensor in which a plurality of magnetic sensors for detecting a magnetic material are linearly arranged, and more particularly to a magnetic line sensor in which a plurality of unit magnetic line sensors are connected.

  Conventionally, magnetic line sensors in which a plurality of magnetic sensors are linearly arranged to detect a magnetic pattern printed with magnetic ink on paper sheets such as banknotes and securities are known in various configurations. Yes. For example, a plurality of magnetic sensors using ferromagnetic thin film magnetoresistive elements are arranged in a straight line in the longitudinal direction, and the distribution of the magnetic material (for example, magnetic ink) in the width direction on the medium to be detected such as banknotes and securities. There is one that can be detected by one reading (Patent Document 1).

JP 2008-145379 A

  However, in recent years, there has been a growing demand for high-resolution magnetic mapping, not just the detection of magnetic patterns, and the emergence of magnetic line sensors capable of high-resolution magnetic mapping over a wide range has been desired. In order to meet this demand, a long magnetic line sensor having a wide single reading range is required. However, since the above-described conventional magnetic line sensor is insufficient in length, there is a problem in that it is necessary to divide the reading range into a plurality of scans repeatedly and cannot meet the above demand.

  In order to solve this problem, a long magnetic line sensor may be realized. For example, when a single magnetic sensor package is arranged and mounted in a large number, it is adjacent. Since magnets have the same poles facing each other, repulsive force is generated between the magnets, so close mounting or contact mounting is difficult, and mutual interference also occurs, so a magnetic line sensor capable of high-resolution magnetic mapping can be created. There is a disadvantage that it is impossible to obtain. Here, even if the magnets are fixed to each other with an adhesive or the like, there is a concern about positional displacement due to creep deformation. In addition, for example, when a large number of magnetic sensors are arranged and arranged in one module and one long magnet is attached to each of the magnetic sensors to increase the length, the position accuracy and cost of the magnetic sensor are reduced. In view of the above, it is difficult to make each magnetic sensor replaceable. Therefore, if even one magnetic sensor fails, there is a disadvantage that the entire module becomes defective. In addition, in the long magnets, the influence of characteristic variation and shape tolerance increases in proportion to the length, and the desired sensor performance cannot be obtained. If the two are arranged in an aligned manner, there is a disadvantage that repulsive force is generated between the magnets as described above.

  The present invention eliminates such inconveniences and suppresses the influence of repulsive force generated between adjacent magnets by connecting a plurality of normally used magnetic line sensors to a high resolution magnetic sensor. An object is to obtain a long magnetic line sensor capable of mapping.

In order to achieve the above object, a magnetic line sensor according to claim 1 of the present invention comprises a plurality of magnetic sensors arranged substantially linearly on one surface of a substrate, and biased to the magnetic sensor on the other surface of the substrate. A unit magnetic line sensor module in which magnets magnetized in the thickness direction to which a magnetic field is applied is arranged so that the side opposite to the substrate of the magnet is exposed at the connecting end, and the magnetic material is magnetized on the exposed surface. the magnet wear to adjacent the unit magnetic line sensor module Ri greens a plurality connected in a state where same poles are opposed, the unit magnetic line sensor module, a plurality arranged substantially in a straight line a magnetic sensor on one side A holder having the same width and length as the substrate and supporting the magnet is overlapped and fixed to the other surface of the substrate, and the holder is placed in front of a space extending in the longitudinal direction. Those with supporting the magnet in a state of applying the desired bias magnetic field to the magnetic sensor, and the substrate corresponding to the connecting end surface opposite is opened, obtained by forming so as to expose an end portion of said magnet It is.

  By magnetizing and connecting the ends of adjacent magnets so that the magnetic material straddles them, the influence of repulsive force between the magnets is suppressed by the magnetic material.

Further , by supporting the magnet on the holder and fixing the holder to the substrate, the positional relationship between the magnet and the magnetic sensor becomes a desired state.

According to the magnetic line sensor of claim 1 of the present invention, a long magnetic line sensor having a desired length is obtained by connecting a plurality of unit magnetic line sensor modules while suppressing the influence of repulsive force between adjacent magnets. In addition, since the operation of each magnetic sensor in each unit magnetic line sensor module is accurately performed, the operation of the long magnetic line sensor formed by connecting the unit magnetic line sensor modules is also accurate. There is an effect that high-resolution magnetic mapping can be performed over a wide range.
Pressurized forte, in each unit magnetic line sensor module, by fixing the holder on the substrate, the magnet is supported on the holder, the position can be added the desired bias magnetic field to the magnetic sensor disposed in the substrate Since it can arrange | position, there exists an effect that operation | movement of a magnetic line sensor is made more correctly.

The top view of the board | substrate carrying the magnetic licensor which shows one Embodiment of this invention. Similarly the enlarged plan view of a magnetic sensor. The perspective view of a magnet similarly. The top view of the state which fixed the magnet to the holder similarly. The side view of the same state similarly. FIG. 6 is a cross-sectional view taken along line AA in FIG. 5. FIG. 6 is a sectional view taken along line BB in FIG. Similarly CC sectional view taken on the line of FIG. The perspective view which similarly shows the board | substrate side of a unit magnetic line sensor module. The perspective view which similarly shows the opposite side to the board | substrate of a unit magnetic line sensor module. The perspective view of the state which similarly connected the unit magnetic line sensor module with the magnetic body. The perspective view of the state which connected the unit magnetic line sensor module using the magnetic body of other embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, a magnetic line sensor 2 is mounted on one surface of a substrate 1. This magnetic line sensor 2 is formed by arranging a large number of magnetic sensors 3 having the same configuration on the basis of the sensor arrangement pattern so as to be positioned at the center in the width direction of the substrate 1 in a straight line with a narrow pitch. On each side of the substrate 1 in the width direction, one amplifier IC 4 is provided for each magnetic sensor 3.

  As shown in FIG. 2, the magnetic sensor 3 is composed of two ferromagnetic thin film magnetoresistive elements connected in parallel as unit sensor elements 5a and 5b, and a pair of unit sensor elements 5a and 5b connected in series. Two magnetic sensor elements 6 are formed. The magnetic sensor element 6 has the same configuration, and an element electrode 7 connected to a common output terminal is provided on one end side of the pair of unit sensor elements 5a and 5b facing each other in the longitudinal direction. An element electrode 8 connected to the power supply terminal is provided on the other end side in the longitudinal direction of one unit sensor element 5a, and an element electrode connected to the ground terminal is provided on the other end side in the longitudinal direction of the other unit sensor element 5b. 9 is provided.

  Although not shown, the magnetic sensor 3 has a circuit configuration in which the resistance value change of each of the two ferromagnetic thin film magnetoresistive elements 5aa and 5bb is output differentially. It is accurately operated that the magnet is arranged between the ferromagnetic thin-film magnetoresistive elements 5aa and 5bb so that the position of the magnetic sensor 3 in the magnetic sensing direction is zero among the magnetic field of the magnet. It becomes the condition for. FIG. 3 shows a magnet for applying a bias magnetic field to each of the unit sensor elements 5a and 5b. The magnet 11 has a pentagonal cross section, and a position where the magnetic field component in the magnetic sensing direction of the magnetic sensor 3 becomes zero at the ridge 12 portion. It corresponds. Further, as shown in FIG. 10, narrow grooves 11 a and 11 b extending in the width direction are formed on the lower surface of the magnet 11.

As shown in FIGS. 4 and 5, the holder 21 has a space portion 22 extending in the longitudinal direction for arranging the magnet 11, and an upper surface blocking portion having a lower surface opened at three locations, both end portions and a central portion. 23a, 23b, and 24, and upper surface opening block portions 25a and 25b having lower surfaces closed adjacent to the upper surface closing portion 24. The upper surface blocking portions 23a and 23b are configured and arranged symmetrically with respect to a surface that bisects the longitudinal direction of the holder 21. The holder 21 is made of a synthetic resin and is formed by a mold, and the length in the width direction and the length direction are set to be the same as the length in the width direction and the length direction of the substrate 1, respectively. As can be understood from FIG. 5 , the upper surfaces of the upper surface blocking portions 23a and 23b and the upper surface opening block portions 25a and 25b are slightly higher than the other portions and located on the same plane. The substrate 1 is superimposed on the surface opposite to the mounting surface of the magnetic line sensor 2.

  As can be understood from FIG. 6 to FIG. 8, the magnet 11 is supported at both inner side surfaces of the upper surface closing portions 23 a and 23 b at both side surfaces at both ends, and has a pair of tips engaged with the grooves 11 a and 11 b. It is fixed to the holder 21 with an adhesive in a state in which the ridge 12 portion is supported on the inner upper surface of each upper surface blocking portion 23a, 23b, 24 by being biased upward by the spring bodies 26a, 26b. And as for the said magnet 11, while the edge 12 part is located in the center of the width direction of the said holder 21, the lower surface of both ends is exposed (refer FIG. 10).

  4 to 8, a pair of receiving members 27a and 27b of a metal cover (not shown) provided after the holder 21 and the substrate 1 are fixed to each of the upper surface closing portions 23a and 23b of the holder 21. It is provided one by one. Further, the holder 21 is provided with a pair of attachment claws 28a and 28b for attaching the holder 21 to other members to which the magnetic line sensor is attached, on each of the upper surface open block portions 25a and 25b. The pair of spring bodies 26a and 26b are provided on the upper surface closing portions 23a and 23b of the upper surface opening block portions 25a and 25b.

  As shown in FIG. 9, the other surface of the substrate 1 on which the magnetic line sensor 2 is mounted and sealed with resin is attached to the upper surfaces of the upper surface blocking portions 23 a and 23 b of the holder 21 and the upper surface opening block portions 25 a and 25 b. The unit magnetic line sensor module 31 is formed by positioning the edges in the width direction and the longitudinal direction so as to coincide with each other and fixing with an adhesive. And as shown in FIG. 10, the lower surface of the magnet 11 located in the both ends of this unit magnetic line sensor module 31 is in an exposed state.

  Thus, by positioning and fixing the substrate 1 and the holder 21, the magnetic sensor out of the magnetic fields of the magnetic sensors 3 of the magnetic line sensor 2 mounted on the substrate 1 and the magnet 11 supported and fixed to the holder 21. The relationship with the position where the component in the magnetosensitive direction 3 becomes zero becomes a desired state. Normally, the unit magnetic line sensor module 31 shown in FIG. 9 is provided with a metal cover (not shown) for use. And since the relationship between each magnetic sensor 3 and the position where the component in the magnetic sensing direction of the magnetic sensor 3 becomes zero in the magnetic field of the magnet 11 is in a desired state, A desired bias magnetic field is applied by the magnet 11 and each magnetic sensor 3 operates accurately, so that the operation of the magnetic line sensor 2 in the unit magnetic line sensor module 31 becomes accurate.

  Next, a long magnetic line sensor constituted by connecting a plurality of unit magnetic line sensor modules 31 with a magnetic material will be described. As shown in FIG. 11, the end surface of the upper surface closing part 23a of the holder 21 in one unit magnetic line sensor module 31 and the end surface of the upper surface closing part 23b of the holder 21 in another unit magnetic line sensor module 31 are joined together. In addition, the two unit magnetic line sensor modules 31 and 31 are coupled by being magnetically attached to the end exposed surface of each magnet 11 so as to straddle the rectangular parallelepiped magnetic body 41. The magnetic body 41 may be a ferromagnetic body, and examples thereof include iron oxide, chromium oxide, cobalt, and ferrite.

  In the connection of the unit magnetic line sensor modules 31, 31, the end surfaces of the magnets 11, 11 are also joined, but since the magnetic bodies 41 are joined via the magnetic body 41, the magnetic body 41 is between the magnets 11, 11. It is possible to apply a desired bias magnetic field to each magnetic sensor 3 without adversely affecting the original action of each magnet 11, 11 by suppressing the influence of the repulsive force. In this way, by connecting the desired number of unit magnetic line sensor modules 31 via the magnetic body 41, a long range having a length that is a multiple of the length of the unit magnetic line sensor module 31 and a wide range. It is possible to obtain a magnetic line sensor capable of performing high-resolution magnetic mapping for the target.

  Next, another embodiment of the magnetic material will be described. As shown in FIG. 12, the magnetic body 42 has an H-shaped planar shape, and includes a pair of locking pieces 42a and 42a and a connecting piece 42b. And the connecting piece of each said locking piece 42a, 42a on the surface opposite to the joining surface of the upper surface obstruction | occlusion part 23a and each upper surface obstruction | occlusion part 23b of each holder 21 and 21 which each unit magnetic line sensor module 31 and 31 joined. With the end face on the side of 42b locked, the magnetic bodies 42 are magnetized so as to straddle the exposed end faces of the magnets 11 and 11, and the unit magnetic line sensor modules 31 and 31 are connected. .

  Since the unit magnetic line sensor modules 31 and 31 are prevented from being displaced in the separation direction of the upper surface closing portion 23a and the upper surface closing portion 23b by the locking pieces 42a and 42a of the magnetic body 42, the connected state is It will be stronger. In addition, when using the magnetic body 42 whose planar shape is H shape, the surface opposite to the board | substrate 1 in the upper surface obstruction | occlusion part 23a and the upper surface obstruction | occlusion part 23b to be joined exists in the protruding state from the exposed surface of the magnet 11. In addition, the opposite surface of the holder 21 located between the upper surface blocking portions 23a and 23b and the upper surface opening block portions 25a and 25b is lower than or equal to the exposed surface of the magnet 11. is necessary.

  In addition, this invention is not limited to each embodiment mentioned above, For example, it replaces with the rod-shaped magnet 11 of a cross-sectional pentagon, and may use the rod-shaped magnet which is a rectangular parallelepiped. Of the magnetic field of the magnet, the position where the component in the magnetic sensing direction of the magnetic sensor 3 becomes zero is usually on the center line extending in the center in the width direction. When the magnet is a rectangular parallelepiped, the shape of the holder 21 may be a frame shape with the upper and lower surfaces open, and both side surfaces of both end portions of the magnet may be sandwiched from both sides.

  As a method for more accurately positioning the bias magnetic field position of the magnet 11 fixed to the holder 21 and the central portion of each magnetic sensor 3 disposed on the substrate 1, there is the following. First, a pair of cutting / removing portions for cutting and removing after positioning are provided at both ends in the longitudinal direction of the substrate 1 for mounting the magnetic line sensor 2 in which a plurality of magnetic sensors 3 are arranged substantially linearly. Each of the magnets 11 applies a bias magnetic field to the magnetic sensor 3 so as to correspond to the arrangement state of the magnetic sensor 3 based on the sensor arrangement pattern of the magnetic sensor arrangement surface which becomes a reference when arranging the magnetic sensor 3. The first positioning portion is formed on the extension of the portion where the position where the component of the magnetic sensing direction of the magnetic sensor 3 becomes zero in the magnetic field of the magnetic sensor 3, and then the magnetic sensor is formed on the substrate 1 based on the pattern. A plurality of 3 are arranged substantially linearly. On the other hand, a pair of cutting / removing portions that are cut and removed after positioning are provided at both ends in the longitudinal direction of the holder 21 that supports and fixes the magnet 11, and each of these cutting / removing portions has magnetism when the magnet 11 is supported in a predetermined state. A second positioning part is formed on the extension of the part where the position where the component in the magnetic sensing direction of the sensor 3 is zero is to be located. And the said 1st positioning part and the said 2nd positioning part are made to correspond, and the said board | substrate 1 and the said holder 21 are positioned and fixed.

DESCRIPTION OF SYMBOLS 1 Board | substrate 2 Magnetic line sensor 3 Magnetic sensor 11 Magnet 12 Edge 21 Holder 22 Space part 23a, 23b, 24 Upper surface obstruction | occlusion part 25a, 25b Upper surface open | release block part 31 Unit magnetic line sensor module 41, 42 Magnetic body 41a Locking piece 42b Connection Fragment

Claims (1)

A unit magnetic line sensor module in which a plurality of magnetic sensors are arranged substantially linearly on one surface of the substrate, and a magnet magnetized in the thickness direction for applying a bias magnetic field to the magnetic sensor is arranged on the other surface of the substrate. In the connecting end portion, the surface of the magnet opposite to the substrate is exposed, and a magnetic material is magnetically attached to the exposed surface so that the unit magnet line sensor module has the same polarity facing each other. Ri Na and more linked state, the unit magnetic line sensor module, the one surface to the other surface of the substrate formed by arranging a plurality of magnetic sensor substantially linearly, in that the substrate of the same size width and length A holder that supports a magnet is superposed and fixed, and the holder supports the magnet in a state where a desired bias magnetic field is applied to the magnetic sensor in a space extending in the longitudinal direction. , And the substrate corresponding to the connecting end surface opposite is opened, the magnetic line sensor, characterized in forming to such Rukoto so as to expose the ends of the magnet.

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