JP2016125860A - Method of positioning magnet in magnetic line sensor, and positioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method that positions a magnet in a magnetic line sensor at a desired position with respect to a magnetic sensor mounted on a substrate.SOLUTION: A substrate for mounting thereon a magnetic line sensor with a plurality of magnetic sensors arranged in a substantial linear manner has a pair of cut-off removed sections provided at respective ends thereof in a longitudinal direction. A through-hole is formed at each of the pair of cut-off removed sections, on an extension of a position corresponding to a position where a magnet 31 for applying a bias magnetic field to the magnetic sensors has no magnetic field component in a magneto-sensitive direction of the magnetic sensors. A holder 21 for supporting and fixing the magnet 31 comprises a pair of cut-off removed sections 22a and 22b at respective ends thereof in a longitudinal direction. A protrusion 25a, 25b is formed at each of the pair of cut-off removed sections 22a and 22b, on an extension of the position where the magnet 31 has no magnetic filed component in the magneto-sensitive direction of the magnetic sensors. The protrusions 25a, 25b are then positioned corresponding to the respective through-holes of the substrate. The protrusions 25a, 25b are fitted into the through-holes, thereby positioning and fixing the substrate to the holder 21, and thus supporting and fixing the magnet 31 to the holder 21 either before or after the fixation.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a method for positioning a magnet at a predetermined position with respect to each magnetic sensor in a magnetic line sensor in which a plurality of magnetic sensors for detecting a magnetic material are linearly arranged, and an apparatus used for this positioning method.

  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

  Generally, in a magnetic line sensor, a plurality of magnetic sensors are mounted so that a desired bias magnetic field is applied to a plurality of linearly arranged sensor elements of a magnetic sensor, for example, a ferromagnetic thin film magnetoresistive element. It is necessary to arrange at a desired position on the opposite side to the mounting surface of the substrate. Thus, the positional relationship between the magnet and the sensor element is important for the arrangement position of the magnet. Specifically, the position where the magnetic field component of the magnet in the magnetic sensing direction of the magnetic sensor becomes zero (magnetic field center position) and the sensor element. The positional relationship with is important. However, in addition to the fact that both are located on opposite sides of the substrate, each magnetic sensor is normally sealed on the substrate and cannot be seen, so image recognition is not possible, and the magnet is positioned at the desired position. Is extremely difficult to position. For this reason, conventionally, there has been a disadvantage that a desired bias magnetic field cannot be applied to each sensor element, and the magnetic pattern cannot be detected with high accuracy.

  The present invention provides a method for positioning a magnet at a desired position with respect to a plurality of magnetic sensors mounted on a substrate in a magnetic line sensor, and a positioning device used in this method, in order to eliminate such disadvantages. The purpose is to do.

  In order to achieve the above object, a magnet positioning method in a magnetic line sensor according to claim 1 of the present invention is characterized in that both ends in the longitudinal direction of a substrate for mounting a magnetic line sensor comprising a plurality of magnetic sensors arranged substantially linearly. The magnetic sensor is arranged to correspond to the arrangement state of the magnetic sensor based on the sensor arrangement pattern of the magnetic sensor arrangement surface which becomes a reference when arranging the magnetic sensor in each of the pair of cutting and removing units provided in the unit. A first positioning portion is formed on an extension of a portion where a magnetic field component in a magnetic sensitive direction of the magnetic sensor of the magnet for applying a bias magnetic field is to be positioned, and then the magnetic sensor is mounted on the substrate based on the pattern. While arranging a plurality of substantially linear shapes, a magnet is supported in a predetermined state on each of a pair of cutting and removing portions provided at both ends in the longitudinal direction of the holder that supports and fixes the magnet. A second positioning portion is formed on an extension of a portion where a position where the magnetic field component in the magnetic sensing direction of the magnetic sensor is zero is located, and the first positioning portion and the second positioning portion are The substrate and the holder are positioned and fixed at corresponding positions, and the magnet is supported on the holder and fixed either before or after the fixing.

  Similarly, in order to achieve the above object, the magnet positioning method in the magnetic line sensor according to claim 2 of the present invention is the magnet according to the invention of claim 1, wherein the magnet holder is supported at least at both ends in the longitudinal direction of the magnet. It is made in the department.

  According to the above method, the magnet supported by the holder is attached to the substrate by positioning and fixing the substrate and the holder in a predetermined state with the first and second positioning portions at each end corresponding to each other. It arrange | positions in the position which can apply a desired bias magnetic field with respect to each arrange | positioned magnetic sensor. Further, when the both ends of the magnet are supported by the holder, the magnet is supported in a state in which the influence of the warp in the width direction of the holder and the distortion is small.

  Similarly, in order to achieve the above object, a magnet positioning device in a magnetic line sensor according to claim 3 of the present invention includes a pair of cut and remove portions at both longitudinal ends, and a magnetic sensor is disposed at each of the cut and remove portions. The extension of the position that should correspond to the position where the magnetic field component of the magnetic sensor of the magnetic sensor that applies a bias magnetic field to the magnetic sensor becomes zero based on the sensor arrangement pattern of the magnetic sensor arrangement surface that becomes a reference when A first positioning portion is formed on the substrate, and a plurality of magnetic sensors are arranged in a substantially linear shape, and a space portion extending in the longitudinal direction for arranging the magnets is provided. A cutting / removing portion, and when each of the cutting / removing portions has the magnet, the magnetic sensor has a magnetic field component in the magnetically sensitive direction that is positioned on an extension of the zero position. The positioning portion, the form in the first same interval as the positioning portion, the space portion is made of a holder having a support portion for supporting the magnet at least at its both ends.

  According to the above apparatus, the first positioning portion provided on the substrate and the second positioning portion provided on the holder are positioned to correspond to each other, and the substrate and the holder are positioned and fixed, either before or after the fixing. The magnet is arranged in a position where a desired bias magnetic field can be applied to each magnetic sensor arranged on the substrate by arranging the magnet in the space portion of the holder and supporting it by the support portion and fixing it. The And after positioning and fixing a board | substrate and a holder, each cutting | disconnection removal part of a board | substrate and a holder is each cut | disconnected and removed, and it uses for a magnetic line sensor.

According to the magnet positioning method in the magnetic line sensor according to claim 1 of the present invention, the first and second positioning portions at the end portions of the substrate and the holder are positioned in correspondence with each other easily and reliably. The positioning can be fixed, and the magnet supported by the holder by this positioning can be arranged at a position where a desired bias magnetic field can be applied to each magnetic sensor arranged on the substrate. Play.
Moreover, according to the magnet positioning method in the magnetic line sensor according to claim 2 of the present invention, in addition to the above effect, the holder is deformed in the width direction such as warping by supporting the magnet at both ends. However, it is possible to minimize the influence and to support the magnet at a desired position with respect to each magnetic sensor arranged on the substrate.

  According to the magnet positioning apparatus for a magnetic line sensor according to claim 3 of the present invention, the substrate and the holder are positioned and fixed, and the magnet is arranged in the space of the holder before and after the fixing and is supported by the support portion. In addition, by fixing, the magnet can be arranged at a position where a desired bias magnetic field can be applied to each magnetic sensor arranged on the substrate.

The top view of the two board | substrates arranged side by side which have the cutting removal part which shows one Embodiment of this invention. The top view of the board | substrate which has the cutting removal part similarly mounted with the magnetic licensor. Similarly the enlarged plan view of a magnetic sensor. The perspective view of the holder which similarly has a cutting removal part. The perspective view of a magnet similarly. The perspective view of the state which fixed the magnet to the holder which similarly has a cutting removal part. The perspective view of the state which fixed and positioned the board | substrate which has the cutting removal part which similarly mounted the magnetic removal sensor and the holder which has the cutting removal part which fixed the magnet. The perspective view of the state which cut | disconnected each cutting removal part after the board | substrate and the holder were similarly positioned and fixed. The perspective view of the magnet in other embodiments. The perspective view of the state which fixed the magnet to the holder which similarly has a cutting removal part. FIG. 11 is a cross-sectional view taken along line AA in FIG. 10. FIG. 11 is a sectional view taken along line B-B in FIG. 10. Similarly CC sectional view taken on the line of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. For convenience of description, a positioning device will be described first. As shown in FIG. 1, the substrate 1 is provided with a pair of cut and removed portions 2a and 2b that are finally cut and removed at both ends in the longitudinal direction. Initially, the two pieces are arranged in parallel by the cut and removed portions 2a and 2b. It is installed. The cut and remove portions 2a and 2b are formed with through holes 3a and 3b as first positioning portions, respectively. These through holes 3a and 3b are formed on the extension of the position where the component in the magnetic sensing direction of the magnetic sensor 5 becomes zero out of the magnetic field of the magnet arranged on the opposite side of the magnetic line sensor arrangement surface. . The arrangement position of the magnetic sensor 5 where the magnetic field component in the magnetic sensing direction is zero is the sensor arrangement pattern on the line sensor arrangement surface (reference line) when a plurality of magnetic sensors are arranged linearly on the substrate 1. It is determined based on information obtained by image processing (not shown).

  As shown in FIG. 2, after the through holes 3 a and 3 b are formed, the holes are cut to become one substrate 1, and a magnetic line sensor 4 is mounted on one surface of the substrate 1. The magnetic line sensor 4 is formed by arranging a large number of magnetic sensors 5 having the same configuration in a straight line at a narrow pitch based on a sensor arrangement pattern. One amplifier IC 6 is provided for each magnetic sensor 5 on both sides in the width direction of the substrate 1.

  As shown in FIG. 3, the magnetic sensor 5 is formed by connecting two ferromagnetic thin film magnetoresistive elements in parallel as unit sensor elements 7a and 7b, and connecting a pair of unit sensor elements 7a and 7b in series. Two magnetic sensor elements 8 are formed. The magnetic sensor element 8 has the same configuration, and an element electrode 9 connected to a common output terminal is provided on one end side of the pair of unit sensor elements 7a and 7b facing each other in the longitudinal direction. Further, an element electrode 10 connected to the power supply terminal is provided on the other end side in the longitudinal direction of one unit sensor element 7a, and an element electrode connected to the ground terminal on the other end side in the longitudinal direction of the other unit sensor element 7b. 11 is provided. Although not shown, the magnetic sensor 5 has a circuit configuration in which changes in resistance values of the two ferromagnetic thin film magnetoresistive elements 7aa and 7bb are differentially output. The condition for the correct operation is that the magnet should be placed between the ferromagnetic thin film magnetoresistive elements 7aa and 7bb so that the magnetic field component in the magnetic sensing direction of the magnet magnetic sensor 5 is zero. It becomes.

  As shown in FIG. 4, the holder 21 has a frame-like overall shape, and is provided with a pair of cut-and-removed portions 22 a and 22 b that are finally cut and removed at both ends in the longitudinal direction. Yes. The holder 21 is made of synthetic resin and is molded by a mold. The cut / removal portions 22a and 22b are configured to be positioned above and below the cut / removal portions 2a and 2b of the substrate 1 when the substrate 1 is stacked on the holder 21. Further, the holder 21 is provided with a space portion 23 extending in the longitudinal direction for arranging a rectangular parallelepiped magnet 31 shown in FIG. In this space portion 23, a pair of protrusions 24 a and 24 b (only one of them is shown) as support portions for supporting the both end portions of the magnet 31 by pressure contact are provided in the vicinity of the end portion of the opposing wall forming the space portion 23. Provided. In the magnet 31, the position of the center line extending in the longitudinal direction at the center in the width direction is a position where the magnetic field component in the magnetic sensing direction of the magnetic sensor 5 becomes zero.

  And in each cutting removal part 22a, 22b, when the magnet 31 is arrange | positioned in the space part 23 in a predetermined state, on the extension of the position where the magnetic field component of the magnetic sensor 5 of the said magnetic sensor 5 becomes zero. The rectangular parallelepiped protrusions 25a and 25b, which are the second positioning portions, are provided so as to be positioned at the positions. These protrusions 25a and 25b are formed so as to project on the upper surfaces of the thin end walls 26a and 26b, and have the same interval as the interval between the through holes 3a and 3b provided in the respective cut and removal portions 2a and 2b of the substrate 1. . The lengths of the protrusions 25a and 25b in the longitudinal direction are formed slightly longer than the diameters of the through holes 3a and 3b, and are press-fitted into the through holes 3a and 3b. Further, since the end walls 26a and 26b are thin, the holder 21 can be displaced in a certain range in the longitudinal direction of the holder 21, and therefore each protrusion 25a, 25 can also be displaced in the certain range in the longitudinal direction.

  In addition, a pair of receiving members 27a and 27b for metal covers (not shown) provided after positioning and fixing the holder 21 and the substrate 1 are provided on the upper surface of the holder 21 in the vicinity of the cutting and removing portions 22a and 22b. . Furthermore, the holder 21 is provided with two pairs of attachment claws 28a and 28b which are attachment portions for attaching the holder 21 to other members to which the magnetic line sensor 4 is attached.

  Then, the positioning method of the magnet 31 using the board | substrate 1 and the holder 21 mentioned above is demonstrated. First, as shown in FIG. 6, the magnet 31 is inserted from above or below into the space 23 of the holder 21 with the N pole on the top and the S pole on the bottom, and both ends of the magnet 31 are connected to each pair. The projections 24a and 24b are set in a predetermined state in which they are pressed and supported from the width direction. In this predetermined state, the magnet 31 is mounted on the holder 21.

  Next, the through-holes 3a and 3b provided in each of the pair of cut-off portions 2a and 2b provided at both ends in the longitudinal direction of the substrate 1 mounted with the magnetic line sensor 4 and sealed with resin, and the length of the holder 21 The protrusions 25a and 25b provided on the pair of cut and removal parts 22a and 22b provided at both ends in the direction are respectively positioned corresponding to each other. Then, as shown in FIG. 7, the protrusion 25a is inserted into the through hole 3a, the protrusion 25b is inserted into the through hole 3b, and the substrate 1 and the holder 21 are positioned. The members 1 and 21 are fixed with an adhesive.

  In this way, by positioning and fixing the substrate 1 and the holder 21, the magnetic sensor out of the magnetic fields of the magnetic sensors 5 of the magnetic line sensor 4 mounted on the substrate 1 and the magnet 31 supported and fixed to the holder 21. The relationship with the position where the magnetic field component in the magnetosensitive direction 5 becomes zero becomes a desired state. In this state, when the pair of cut / removal portions 2a, 2b, 22a and 22b of the substrate 1 and the holder 21 are cut and removed, the use state shown in FIG. 8 is obtained. Normally, a metal cover (not shown) is provided for use in the state shown in FIG. Since the relationship between each magnetic sensor 5 and the position where the magnetic field component in the magnetic sensing direction of the magnetic sensor 5 becomes zero among the magnetic fields of the magnets 31 is in a desired state, A desired bias magnetic field is applied by the magnet 31, and each magnetic sensor 5 operates accurately, so that the operation of the magnetic line sensor 4 becomes accurate.

  Then, the holder which supports the magnet shown in FIG. 9 which is other embodiment is demonstrated. Also in this embodiment, the substrate having the same configuration as that of the substrate 1 described above is used. The magnet 32 is a rod having a pentagonal cross section, and the position where the magnetic field component in the magnetic sensing direction of the magnetic sensor 5 becomes zero corresponds to the ridge 33 portion. As shown in FIG. 10, the holder 41 includes a pair of cut and remove portions 42 a and 42 b that are finally cut and removed at both ends in the longitudinal direction. These cut / removal portions 42a and 42b are configured so as to be positioned above and below the cut / removal portions 2a and 2b of the substrate 1 when the substrate 1 is stacked on the holder 41.

  In addition, the holder 41 has a space portion 43 extending in the longitudinal direction for arranging the magnet 32, and the space portion 43 includes three upper surface closing portions 44, 45, 46, of which the upper surface closing portions 44, 46 are provided. Have the same configuration and are adjacent to the cut-off portions 42a and 42b. As shown in FIGS. 11 to 13, the magnet 32 is supported on both inner side surfaces of the upper surface closing portions 44, 46 at both ends and supported by a pair of spring bodies 47 (only one is shown). At the same time, the ridge 33 is supported on the inner upper surface of each of the upper surface closing portions 44, 45, 46 by being biased upward. That is, a support portion is configured by the inner surface of each of the upper surface closing portions 44, 46, the inner upper surface of each of the upper surface closing portions 44, 45, 46 and the spring body 47.

  When the magnet 32 is placed in the space 43 in a predetermined state, the magnetic field component in the magnetic sensing direction of the magnetic sensor 5 becomes zero when the magnet 32 is arranged in the space 43 in each of the cut and remove portions 42a and 42b. Projections 48a and 48b, which are second positioning portions, are provided so as to be positioned on the extension of the position. These protrusions 48a and 48b are formed to protrude from the upper surfaces of the thin end walls 49a and 49b, and have the same interval as the interval between the through holes 3a and 3b provided in the respective cut and removal portions 2a and 2b of the substrate 1. . The lengths of the protrusions 48a and 48b in the longitudinal direction are formed slightly shorter than the diameters of the through holes 3a and 3b, and can be inserted into the through holes 3a and 3b. Since the end walls 49a and 49b are thin, the end walls 49a and 49b can be displaced in a certain range in the longitudinal direction of the holder 41. Therefore, the protrusions 48a and 48b can also be displaced in a certain range in the longitudinal direction.

  A pair of receiving members 50a and 50b of a metal cover (not shown) provided after the holder 41 and the substrate 1 are positioned and fixed to the upper surface closing portions 44 and 46 close to the cut and removed portions 42a and 42b of the holder 41. It is provided one by one. Furthermore, the holder 41 is provided with two pairs of attachment claws 51a and 51b as attachment portions for attaching the holder 41 to other members to which the magnetic line sensor 4 is attached (see FIGS. 12 and 13). The pair of spring bodies 47 are provided on the upper surface closing portions 44 and 46 side of the holder 41 in the vicinity of the attachment claws 51a and 51b.

  Then, the positioning method of the magnet 32 using the holder 41 and the board | substrate 1 mentioned above is demonstrated. First, the longitudinal direction of the holder 41 and the through holes 3a and 3b provided in each of the pair of cut and removed portions 2a and 2b provided at both ends in the longitudinal direction of the substrate 1 mounted with the magnetic line sensor 4 and sealed with resin. The protrusions 48a and 48b provided on each of the pair of cut and removal parts 42a and 42b provided on both ends are positioned corresponding to each other. Then, the protrusion 48a is inserted into the through hole 3a, and the protrusion 48b is inserted into the through hole 32b to position the substrate 1 and the holder 41 and fix them with an adhesive (FIG. 7). reference).

  Thereafter, the cutting and removing portions 42a and 42b of the holder 41 are cut. Next, as shown in FIG. 10, the magnet 32 is placed in a state in which the N pole is up, the S pole is down, and the ridge 33 faces up. 41, is inserted in the longitudinal direction from one upper surface closing portion, for example, the upper surface closing portion 44, and is urged upward by a spring body 47, so that both side surfaces and ridge 33 portions of both ends of the magnet 32 are respectively While being supported by the inner side surface and the inner upper surface of each upper surface closing part 44, 46, a predetermined state is set in which the central portion of the ridge 33 is supported by the inner upper surface of the upper surface closing part 45. In this predetermined state, the magnet 32 is fixed to the holder 41 with an adhesive.

  In this way, by positioning and fixing the substrate 1 and the holder 41, the magnetic sensor 5 of the magnetic sensors 5 of the magnetic line sensor 4 mounted on the substrate 1 and the magnet 32 supported by the holder 41 has the magnetic sensor 5. The relationship with the position where the magnetic field component in the magnetosensitive direction becomes zero becomes a desired state. In this state, when the pair of cut / removal portions 2a, 2b, 42a, and 42b of the substrate 1 and the holder 41 are cut and removed, a use state is obtained (see FIG. 8). Normally, in this state, a metallic cover is provided for use. Since the relationship between each magnetic sensor 5 and the position where the magnetic field component in the magnetic sensing direction of the magnetic sensor 5 becomes zero among the magnetic fields of the magnets 32 is in a desired state, A desired bias magnetic field is applied by the magnet 32, and each magnetic sensor 5 operates accurately.

  In addition, this invention is not limited to embodiment mentioned above, For example, the shape of the magnets 31 and 32 is not restricted to a rectangular parallelepiped shape or a cross-sectional pentagonal rod shape, By this shape, the space parts 23 and 43 of the holders 21 and 41 are provided. The configuration of is also changed. Further, depending on the shape of the spring body 47, a groove in which the tip of the spring body 47 enters and locks may be provided on the lower surface of the magnet 32.

  Further, the second positioning portions 25a, 25b, 48a, and 48b may be formed by through holes instead of protrusions, and the substrate 1 and the holders 21 and 41 may be fixed using a jig. Furthermore, when the first positioning portions 3a, 3b and the second positioning portions 25a, 25b, 48a, 48b are both through holes, the first positioning portions 3a, 3b or the second positioning portions 25a, 25b, If the through hole on one end side of either one of 48a and 48b is a long hole, positioning is smooth and reliable even if there is a dimensional difference or shrinkage difference between the substrate 1 and the holders 21 and 41.

DESCRIPTION OF SYMBOLS 1 Substrate 2a, 2b, 22a, 22b Cutting removal part 3a, 3b Through-hole 4 Magnetic line sensor 5 Magnetic sensor 7a, 7b Unit sensor element 8 Magnetic sensor element 21, 41 Holder 23, 43 Space part 24a, 24b Protrusion 25a, 25b , 48a, 48b Projections 27a, 27b, 51a, 51b Mounting claws 31, 32 Magnets 44, 45, 46 Upper surface closing portion 47 Spring body

Claims (3)

  Magnets that serve as a reference when the magnetic sensors are arranged in each of a pair of cut and removed portions provided at both ends in the longitudinal direction of the substrate for mounting a magnetic line sensor having a plurality of magnetic sensors arranged substantially linearly. Based on the sensor arrangement pattern on the sensor arrangement surface, a position where the magnetic field component in the magnetic sensing direction of the magnetic sensor of the magnet for applying a bias magnetic field to the magnetic sensor corresponding to the arrangement state of the magnetic sensor should be zero. After the first positioning part is formed on the extension of the part, a plurality of magnetic sensors are arranged substantially linearly on the substrate based on the pattern, and a pair provided at both ends in the longitudinal direction of the holder that supports and fixes the magnet In each of the cutting and removing sections, the second position on the extension of the portion where the magnetic field component in the magnetically sensitive direction of the magnetic sensor when the magnet is supported in a predetermined state is to be located. A fixed part is formed, the first positioning part and the second positioning part are made to correspond to each other, and the substrate and the holder are positioned and fixed, and the magnet is supported on the holder either before or after the fixing. And a magnet positioning method in the magnetic line sensor.   The method of positioning a magnet in a magnetic line sensor according to claim 1, wherein the magnet is supported by the holder at least at both ends in the longitudinal direction of the magnet. A pair of cutting / removing portions are provided at both ends in the longitudinal direction, and a bias magnetic field is applied to each of the cutting / removing portions based on the sensor arrangement pattern on the magnetic sensor arrangement surface used as a reference when the magnetic sensor is arranged. A first positioning portion formed on an extension of a position corresponding to a position where the magnetic field component of the magnetic sensor in the magnetic sensing direction of the magnet is zero, and a plurality of magnetic sensors arranged substantially linearly; And a space extending in the longitudinal direction for disposing the magnets and a pair of cutting and removing portions at both ends in the longitudinal direction, and in each of the cutting and removing portions, a magnetic sensing direction of the magnetic sensor of the disposed magnet is provided. On the extension of the position where the magnetic field component becomes zero, a second positioning portion is formed at the same interval as the interval of the first positioning portion, and the space portion is a support for supporting the magnet at least at both ends thereof. Positioning device of the magnets in the magnetic line sensor, characterized in that it consists of a holder having a parts.

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