JP5699577B2 - Detection system, detection device, article and program - Google Patents

Description

  The present invention relates to a detection system, a detection device, an article, and a program.

  Japanese Patent Laid-Open No. 2004-228561 describes the position of the owner who holds the detected object in the detection area in order to change the positional relationship between the alternating magnetic field and the detected object. An object detection apparatus comprising: a moving means forcibly moving the detection object; and a detection means for detecting the detected object based on a signal generated from a magnetic material applied to the detected object by application of the alternating magnetic field. It is disclosed.

JP 2008-46904 A

  An object of the present invention is to provide a detection system, a detection device, an article, and a program that can specify the type of an article while suppressing an increase in cost.

In order to achieve the above object, a detection system according to claim 1 includes a magnetic field generating coil that generates an alternating magnetic field in a region to be detected of an article, and an electrical signal corresponding to the alternating magnetic field generated by the magnetic field generating coil. A plurality of coil groups arranged so that the generation directions of the alternating magnetic field generated by each of the magnetic field generating coils are different from each other, and the detection target, respectively. The magnetic body is arranged such that the axis direction of the easy magnetization axis is included in a predetermined range including the generation direction of the alternating magnetic field generated by the magnetic field generating coils of the coil groups different from each other when positioned in the region to be magnetized. provided, a plurality of types of articles ranges said predetermined that contains the axial direction for each type are different, the field of the article to the area in the detection target is positioned By induction state of the electrical signal by the signal induction coil of the plurality of sets of coil groups in response to changes in magnetic field due to the magnetization reversal of the magnetic associates the type of the plural types of articles in the type of the article Specifying means for specifying.

  According to a second aspect of the present invention, in the first aspect of the invention, at least one of the plurality of types of articles is provided with a plurality of the magnetic bodies corresponding to the plurality of sets of the coil group. It is supposed to be.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein when the type of the article is specified by the specifying means, the position of the article and the plurality of sets of coil groups is determined. It further includes positioning means for positioning the article so that the relationship is a predetermined positional relationship.

  Furthermore, the invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the article is provided with a plurality of the magnetic bodies corresponding to the same coil group. The specifying means further specifies the number of magnetic bodies provided in the article based on the signal level of the electrical signal induced in the signal induction coil.

On the other hand, in order to achieve the above-mentioned object, the detection device according to claim 5 is responsive to a magnetic field generating coil that generates an alternating magnetic field in a region to be detected of an article and an alternating magnetic field generated by the magnetic field generating coil. A plurality of coil groups each including a signal induction coil for inducing an electrical signal, and arranged so that the generation directions of the alternating magnetic fields generated by the magnetic field generation coils are different from each other, and the detection When positioned in a target region, the magnetic direction is such that the axis direction of the easy magnetization axis is included within a predetermined range including the generation direction of the alternating magnetic field generated by the magnetic field generating coils of the coil groups different from each other. body is provided, for the predetermined range is different types of articles that contain the axial direction for each type of the plurality of types of articles type and said plurality of sets of Storage means for storing a set and identification information that associates with the yl group, said plurality of types of articles in accordance with the change in the magnetic field due to the magnetization reversal of the magnetic body in the case which is located in the region to be the detection target Specifying means for specifying the type of the article based on the induction state of the electric signal by the signal induction coil of the plurality of sets of coils and the identification information stored in the storage means .

Furthermore, in order to achieve the above object, a program according to claim 6 includes a magnetic field generating coil that generates an alternating magnetic field in a region to be detected of an article, and an electric power corresponding to the alternating magnetic field generated by the magnetic field generating coil. A plurality of coil groups each including a signal induction coil for inducing a signal and arranged such that the generation directions of alternating magnetic fields generated by the magnetic field generation coils are different from each other, and the detection target Magnetic body so that the axis direction of the easy magnetization axis is included in a predetermined range including the generation direction of the alternating magnetic field generated by the magnetic field generating coils of the coil groups different from each other when positioned in the region is provided, the range in which the predetermined the axis direction is included is performed in a detection system having a plurality of kinds of articles different to each type, co Detecting means for detecting a change in the magnetic field due to magnetization reversal of the magnetic material when the article is positioned in a region to be detected; and the plurality of sets of coils according to the detection result by the detecting means By associating the induction state of the electrical signal by the signal induction coil with the types of the plurality of types of articles , the function is used as specifying means for specifying the type of the article.

According to the first, fifth, and sixth aspects of the invention, the type of article is specified while suppressing an increase in cost compared to the case of specifying the type of article using an IC tag. The effect that it can be obtained.

  In addition, according to the invention described in claim 2, there is an effect that more kinds of articles can be identified as compared with a case where only one magnetic body is provided for all articles to be identified. can get.

  Further, according to the invention described in claim 3, it is possible to obtain the effect that the type of the article can be specified more reliably as compared with the case where the positioning means of the present invention is not provided.

  Furthermore, according to the invention described in claim 4, there is an effect that more types of articles can be specified as compared with a case where only one magnetic body is provided for all the articles to be specified. can get.

1 is a perspective view (partial block diagram) illustrating an overall configuration of a detection system according to an embodiment. It is a perspective view which shows the arrangement state of the coil group in the detection part of the detection system which concerns on embodiment. It is a block diagram which shows the electrical principal part structure of the detection system which concerns on embodiment. It is a wave form diagram with which it uses for description of the large Barkhausen effect. It is a top view which shows the magnitude | size of the article | item with respect to the detection part which concerns on embodiment, and the structure of an article | item. It is a schematic diagram which shows the structure of the identification information which concerns on embodiment. It is a flowchart which shows the flow of a process of the article | item detection process program which concerns on embodiment. It is the schematic which shows the example of a display state of the alerting | reporting screen which concerns on embodiment. It is a top view which shows the other structural example of the detection system which concerns on embodiment. It is a perspective view which shows the other structural example of the detection part which concerns on embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  First, the configuration of the detection system according to the present embodiment will be described with reference to FIG. Note that the detection system according to the present embodiment identifies the type of article provided with a magnetic body having a large Barkhausen effect, and notifies the identification result.

  As shown in the figure, the detection system according to the present embodiment includes a detection unit 10, a control unit 20, a warning light 30, a display device 40, and an article 50.

  In the detection system according to the present embodiment, tickets used in movies, plays, concerts, and the like are applied as the articles 50, and a plurality of types of articles 50 are prepared in advance. Here, in the detection system according to the present embodiment, two types of tickets 50A for adults and 50B for children are prepared as the types of articles 50, but the types of articles are not limited to this. Needless to say.

  On the other hand, the detection unit 10 according to the present embodiment is for detecting a magnetic body 51 (see also FIG. 5) provided on the article 50 in a state where the article 50 is placed on the upper surface. In the detection system according to the present embodiment, the detection system is installed on a table provided at an entrance of a building such as a movie theater, a theater, or a concert hall.

  Here, the detection unit 10 is connected to the control unit 20, and the operation of the detection unit 10 is controlled by the control unit 20. On the other hand, the control unit 20 is connected to the warning light 30 and the display device 40, and the control unit 20 displays the warning by the warning light 30 and various information by the display device 40 according to the detection result by the detection unit 10. . In the detection system according to the present embodiment, the control unit 20, the warning light 30, and the display device 40 are provided in the vicinity of the entrance of the building. However, the present invention is not limited to this, and at least one of these devices. One may be provided in a separate room away from the entrance, or may be provided integrally with the detection unit 10.

  As shown in FIG. 2, the detection unit 10 according to the present embodiment includes an excitation coil 12 that generates an alternating magnetic field, and detection coils 13 and 14 that are induced by an external magnetic field and through which current flows. A plurality of sets (in this embodiment, two sets) of coil groups (in this embodiment, the first coil group 11A and the second coil group 11B) are incorporated. In detection unit 10 according to the present embodiment, detection coils 13 and 14 are provided symmetrically in a predetermined direction for each of first coil group 11A and second coil group 11B. In the detection unit 10 according to the present embodiment, the excitation coil 12 is wound in a direction orthogonal to a surface on which the article 50 of the detection unit 10 is placed (hereinafter referred to as an “article detection surface”). The detection coils 13 and 14 are wound in a direction parallel to the article detection surface. By winding the exciting coil 12 in this way, the alternating magnetic field generated by the exciting coil 12 is more reliably generated in a direction parallel to the article detection surface.

  FIG. 3 shows an electrical main configuration of the detection system according to the present embodiment.

  As shown in the figure, the detection system according to the present embodiment is provided corresponding to each of the first coil group 11A and the second coil group 11B, and generates a magnetic field in the excitation coil 12 in the corresponding coil group. The excitation current supply unit 15 for supplying the excitation current for the first coil group 11A and the second coil group 11B is provided corresponding to each of the first coil group 11A and the second coil group 11B, and is guided to the detection coils 13 and 14 in the corresponding coil group. Signal processing units 21A and 21B that convert analog electrical signals into digital information, and a controller 22 that identifies the type of article 50 based on the digital information obtained by the signal processing units 21A and 21B are provided.

  Here, the detection coils 13 and 14 are arranged adjacent to each other on a plane and the winding directions are reversed. One end of the detection coil 13 is connected to the corresponding signal processing unit 21 </ b> A or signal processing unit 21 </ b> B, and the other end of the detection coil 13 is connected to one end of the detection coil 14. The other end of the detection coil 14 is connected to the corresponding signal processing unit 21A or signal processing unit 21B.

  On the other hand, the controller 22 includes a microcomputer, and includes a CPU (Central Processing Unit) 22A, a ROM (Read Only Memory) 22B, a RAM (Random Access Memory) 22C, and a nonvolatile storage unit 22D including a flash memory. Control the operation of the entire detection system.

  Further, the excitation current supply unit 15 supplies an alternating excitation current to the corresponding excitation coil 12 in accordance with control from the controller 22. The exciting coil 12 is excited when an exciting current is supplied from the exciting current supply unit 15 and generates an alternating magnetic field in which the magnetic field changes like a sine wave. In the detection coils 13 and 14, an alternating current is induced by the alternating magnetic field generated by the corresponding exciting coil 12, and an article 50 including a magnetic material having a large Barkhausen effect exists in the alternating magnetic field. In this case, a pulse current is generated by magnetization reversal.

  4A and 4B are diagrams for explaining the large Barkhausen effect.

  The large Barkhausen effect is made of a BH characteristic shown in FIG. 4A, that is, a material having a relatively small hysteresis loop and a relatively small coercive force (Hc), for example, Co—Fe—Ni—B—Si. This is a phenomenon in which a sharp magnetization reversal occurs when an amorphous magnetic material is placed in an alternating magnetic field. A magnetic material having a large Barkhausen effect reverses its magnetization when a magnetic field with a magnitude greater than a predetermined intensity is applied. For this reason, when an exciting current is passed through the exciting coil 12 to generate an alternating magnetic field and the article 50 is placed in the alternating magnetic field, the detection coils 13 and 14 disposed in the vicinity of the article 50 are pulsed at the time of magnetization reversal. Current flows.

  For example, when an alternating magnetic field shown in the upper part of FIG. 4B is generated by the excitation coil 12, a pulse current shown in the lower part of FIG. 4B flows through the detection coils 13 and 14 as an example.

  However, the currents of the detection coils 13 and 14 include not only this pulse current but also an alternating current induced by an alternating magnetic field. In the detection system according to the present embodiment, in order to cancel the alternating current induced in the detection coils 13 and 14, the detection coils 13 and 14 are connected so that the winding directions are reversed.

The magnetic material (magnetic material) contained in the article 50 is generally a permanent magnet, for example, a rare earth-based neodymium (Nd) -iron (Fe) -boron (B) as a main component, samarium (Sm). -Cobalt (Co) as a main component, Alnico-based aluminum (Al) -Nickel (Ni) -Cobalt (Co) as a main component, Ferrite-based barium (Ba) or Strontium (Sr) and oxidation There are those mainly composed of iron (Fe ₂ O ₃ ), soft magnetic materials, oxide soft magnetic materials, and the like. As the magnetic material causing the large Barkhausen effect, it is preferable to use an amorphous magnetic material whose basic composition is Fe—Co—Si or Co—FeNi.

  The shape of the magnetic material is not particularly limited as long as it is suitable for causing the large Barkhausen effect. However, since the length corresponding to the cross-sectional area is required to cause the large Barkhausen effect, a linear shape (wire shape) or a strip shape is preferable, and a wire shape is more preferable.

  When the magnetic material is in the form of a wire, it is preferable that the minimum diameter necessary for causing the large Barkhausen effect is 10 μm or more. Further, the maximum diameter is not particularly limited. For example, when a magnetic material is mixed into a recording medium (paper) and integrated, the diameter is suppressed in order to prevent the magnetic material from being exposed on the surface of the recording medium. Depends on the thickness of the recording medium. For example, in the case of a recording medium having a thickness of about 90 μm, it is preferably 60 μm or less, more preferably 50 μm or less.

  The length of the magnetic material is preferably 5 mm or more as the minimum length necessary for causing the large Barkhausen effect. The maximum length of the amorphous magnetic material is not particularly limited so long as it is not exposed from the recording medium when it is contained inside, but is preferably 430 mm or less.

  On the other hand, as shown in FIG. 3, the signal processing units 21 </ b> A and 21 </ b> B have a differential voltage between both terminals (a signal voltage output from one end of the corresponding detection coil 13 and the other end of the detection coil 14). A differential amplifier 31 that amplifies and outputs the signal, a waveform shaping circuit 33 that shapes the waveform of the signal output from the differential amplifier 31, and an analog / analog that converts the signal shaped by the waveform shaping circuit 33 into digital information. A digital converter (hereinafter referred to as “ADC”) 34. The signal processing units 21A and 21B provide a signal in a predetermined band corresponding to a pulse current generated by the magnetization reversal of the magnetic material from the signal obtained by the waveform shaping circuit 33 between the waveform shaping circuit 33 and the ADC 34. You may make it further provide the band pass filter which extracts and outputs.

  The controller 22 determines whether or not the level of the digital information output from each ADC 34 of the signal processing units 21A and 21B exceeds a predetermined threshold, or the waveform shape of the digital information is that of the magnetic material. Article 50 is determined by determining whether or not the waveform shape is due to magnetization reversal based on a cross-correlation value with a reference waveform shape that is predetermined as a waveform shape due to magnetization reversal. Is detected on the article detection surface, the warning lamp 30 is detected when the type of the detected article is not the type of the article 50 assumed in advance (the ticket 50A or the ticket 50B in the present embodiment). Lights up. In the detection system according to the present embodiment, the article 50 is detected by the cross-correlation method.

  On the other hand, in the detection system according to the present embodiment, as shown in FIG. 5 as an example, the wire-shaped magnetic body 51 having a large Barkhausen effect with respect to the ticket 50A is set so that the axial direction thereof is vertical. On the other hand, a plurality (three in the present embodiment) of magnetic bodies 51 are provided on the ticket 50B, and a plurality of magnetic bodies 51 (three in the present embodiment) are provided so that the axial direction thereof is the horizontal direction. ing. In contrast, in the detection unit 10 according to the present embodiment, the first coil group 11A and the second coil group 11B have directions in which the generation directions of the alternating magnetic fields generated by the respective excitation coils 12 intersect each other (this embodiment). In this embodiment, the detection unit 10 is provided so as to be in directions orthogonal to each other. Therefore, when the ticket 50A is placed on the article detection surface of the detection unit 10 in the direction shown in FIG. 5, the magnetic body 51 provided on the ticket 50A is detected by the detection coils 13 and 14 of only the first coil group 11A. The When the ticket 50B is placed on the article detection surface of the detection unit 10 in the direction shown in FIG. 5, the magnetic body 51 provided in the ticket 50B is detected by the detection coils 13 and 14 of only the second coil group 11B. The

  As described above, in the detection system according to the present embodiment, the wire-like magnetic body 51 is generated with the generation direction of the alternating magnetic field generated by the excitation coil 12 of the coil group corresponding to the axial direction (easy magnetization axis). The tickets 50A and 50B are provided so as to match, but the present invention is not limited to this. Each ticket includes a generation direction of an alternating magnetic field generated by the excitation coil 12 of the coil group corresponding to the ticket when placed on the article detection surface, and is within a predetermined range as a range in which the magnetization reversal is detected. It is only necessary that the magnetic body 51 is provided so as to include the axial direction. In the present embodiment, the coil groups are arranged so that the generation directions of the alternating magnetic fields generated by the excitation coils 12 are orthogonal to each other. However, the present invention is not limited to this, and the coils are generated by the excitation coils 12. The combinations of the coil groups that cause the magnetization reversal in the magnetic body 51 provided in the articles (tickets 50A and 50B) provided in the articles to be detected (tickets 50A and 50B) are different for each type of article. Just do it.

  As described above, in the detection system according to the present embodiment, using the fact that the coil group detected for each type of the article 50 is different, the article 50 placed on the article detection surface is either the ticket 50A or the ticket 50B. It is equipped with an article specifying function for specifying whether or not.

  For this reason, in the detection system according to the present embodiment, the identification information shown in FIG. 6 is stored in a predetermined area of the ROM 22B as an example. As shown in the figure, the identification information according to the present embodiment is configured such that each information of the detection coil and the identification result is stored.

  In addition, the said detection coil is information which shows the detection coil which detected the goods 50, and the said identification result is information which shows the kind of the said goods 50 when the goods 50 are detected by the corresponding detection coil. In the figure, in order to avoid complications, the detection coils 13 and 14 provided in the first coil group 11A are referred to as “coil A” and the detection coil 13 provided in the second coil group 11B. , 14 are denoted as “coil B”, the ticket 50A is denoted as “article A”, and the ticket 50B is denoted as “article B”. In the example shown in the figure, for example, when the article 50 is detected by the detection coils 13 and 14 of only the first coil group 11A, it indicates that the article 50 is the ticket 50A, and the first coil group 11A and When the article 50 is detected by both the detection coils 13 and 14 of the second coil group 11B, the article 50 is neither the ticket 50A nor the ticket 50B, indicating that the detection result is abnormal.

  Further, as described above, in the detection system according to the present embodiment, the article 50 is detected by the cross-correlation method. Therefore, the controller 22 of the detection system according to the present embodiment has the above magnetization reversal. Digital information (hereinafter referred to as “reference waveform information”) indicating a predetermined reference waveform shape as a waveform shape is stored in a predetermined area of the storage unit 22D in advance.

  Various processes for realizing the article specifying function or the like by the detection system configured as described above may be realized by a software configuration using a computer by executing a program. However, it is not limited to realization by software configuration, and it goes without saying that it may be realized by hardware configuration or a combination of hardware configuration and software configuration.

  Below, the case where the detection system which concerns on this Embodiment implement | achieves various processes by running the said program is demonstrated. In this case, a form in which the program is installed in the controller 22 of the detection system in advance, a form provided in a state stored in a computer-readable recording medium, a form distributed via wired or wireless communication means Etc. may be applied.

  Next, the operation of the detection system according to the present embodiment will be described with reference to FIG. FIG. 7 is a flowchart showing the flow of processing of an article detection processing program executed by the CPU 22A of the controller 22 when a power switch (not shown) of the control unit 20 is turned on. The program is stored in the ROM 22B. Stored in advance.

  First, in step 100 of the figure, control is performed so as to start operation of the signal processing units 21A and 21B in order to start the detection operation by the detection coils 13 and 14 for each of the first coil group 11A and the second coil group 11B. At the same time, the excitation current supply unit 15 is controlled to start supplying the excitation current to the excitation coil 12. In the next step 102, the aforementioned identification information (see also FIG. 6) is read from the ROM 22B, and in the next step 104, the aforementioned reference waveform information is read from the storage unit 22D.

  In the next step 106, a predetermined period (in the present embodiment, 5 seconds) of the digital information output from the signal processing units 21A and 21B in a predetermined first period (in the present embodiment, 5 seconds). Then, a moving average in units of (one cycle of excitation current supplied to the excitation coil 12) is calculated. In the detection system according to the present embodiment, the latest digital information for a predetermined period (in this embodiment, 5 seconds) is stored in the RAM 22C, and this step 106 stores this digital information. The moving average of the period going back by the first period is calculated using the digital information.

  In the next step 108, a cross-correlation value between the reference waveform information read out by the process of step 104 and the digital information averaged by the process of step 106 (hereinafter referred to as “detected waveform information”) is calculated. .

  In the next step 110, it is determined whether or not there is a cross-correlation value calculated by the processing in step 108 above a predetermined threshold value. If the determination is negative, the process proceeds to step 116 described later. On the other hand, if the determination is affirmative, the routine proceeds to step 112. In the detection system according to the present embodiment, the threshold value used in the processing of step 110 is a comparison target depending on the use of the detection system, the specific accuracy for the type of article required for the detection system, and the like. When the cross-correlation value is greater than or equal to the value, it is obtained in advance by an experiment using an actual machine, a computer simulation based on the specifications of the actual machine, etc. The value is used.

  In step 112, the identification result corresponding to the detection coils 13 and 14 used for obtaining the detection waveform information in which the cross-correlation value is determined to be greater than or equal to the threshold value in the process of step 110 is obtained by the process of step 102. By extracting from the read identification information, the type of the article 50 placed on the article detection surface (in this embodiment, the ticket 50A or the ticket 50B) or the detection result is specified to be abnormal, and the next step After notifying the specific result at 114, the process proceeds to step 116. In the detection system according to the present embodiment, as the notification in step 114, when the specific result in step 112 is abnormal, the warning lamp 30 is controlled to be turned on or blinked, and the display device 40 is controlled. To display that the type of the article 50 could not be specified. On the other hand, when the type of the article 50 can be specified in the above step 112, control is performed so that information indicating the specified type of the article 50 is displayed on the display device 40 as shown in FIG.

  In step 116, it is determined whether or not a predetermined timing has arrived as a timing for ending the article detection processing program. If a negative determination is made, the process returns to step 106. Control goes to step 118. In the detection system according to the present embodiment, the timing at which a power switch (not shown) of the control unit 20 is turned off is applied as the predetermined timing. The timing at which a predetermined time is reached as the time at which the operation of the detection system is ended, the timing at which an instruction operation for instructing the end of the article detection processing program is performed by the user, and the like may be applied.

  In step 118, control is performed so as to stop the operation of the signal processing units 21A and 21B and the supply of the excitation current to the excitation coil 12 started by the process of step 100, and then the present article detection processing program is terminated.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the above-described embodiment without departing from the gist of the invention, and embodiments to which such modifications or improvements are added are also included in the technical scope of the present invention.

  The above embodiments do not limit the invention according to the claims (claims), and all the combinations of features described in the embodiments are essential for the solution means of the invention. Is not limited. The embodiments described above include inventions at various stages, and various inventions are extracted by combining a plurality of disclosed constituent elements. Even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, as long as an effect is obtained, a configuration from which these some constituent requirements are deleted can be extracted as an invention.

  For example, in the above embodiment, the case where only the two coil groups of the first coil group 11A and the second coil group 11B are provided for the detection unit 10 has been described, but the present invention is not limited to this. For example, it is good also as a form which provides three or more coil groups.

  In FIG. 9, in addition to the first coil group 11A and the second coil group 11B that are the same as those in the above-described embodiment, the third coil group 11C is provided in the detection unit 10, while the article that is the type of specific object As an example, a form in the case where a ticket 50C is applied in addition to the ticket 50A and the ticket 50B is shown.

  In the example shown in the figure, the third coil group 11C has the same configuration as the second coil group 11B, and the detection unit 10 is placed above the first coil group 11A in the same state as the second coil group 11B. Built in. In addition, the ticket 50C includes a plurality of magnetic bodies 51 having a large Barkhausen effect so that the axial directions thereof are respectively horizontal with respect to two locations detectable by the first coil group 11A and the third coil group 11C. (In the example shown in the figure, three are provided).

  Therefore, in this embodiment, when the ticket 50C is placed on the article detection surface, a pulse current due to magnetization reversal is output from the first coil group 11A and the third coil group 11C. It is specified that 50C is placed.

  Moreover, although the said embodiment demonstrated the case where what put the goods 50 on an article detection surface was applied as the detection part 10, this invention is not limited to this, For example, the goods 50 are the said implementation. In the case of a thin ticket such as the ticket shown in the form, a form in which the article 50 is inserted from the side may be applied as the detection unit 10.

  FIG. 10 shows a configuration example of the detection unit 10 in this case. In this case, as shown in the figure, the sensor 18 is provided at the tip of the insertion direction of the article 50, and normally the energizing coil 12 and the detection coils 13 and 14 are not energized, and the article 18 is inserted by the sensor 18. Only when the completion is detected, the excitation coil 12 and the detection coils 13 and 14 may be energized. The sensor 18 may be a non-contact sensor such as an optical sensor such as a photo interrupter, or a contact sensor that mechanically detects an article by contact.

  Further, in the form shown in the figure, a positioning portion 16 is provided that regulates the position of the end portion and the upper surface in the width direction of the article 50 from the insertion port 17 into which the article 50 is inserted to the deepest portion where the tip of the article 50 abuts. Yes. In this case, the positioning unit 16 is provided with a positional relationship between the article 50 and a plurality of sets of coil groups (in the example shown in the figure, the first coil group 11A and the second coil group 11B) in the corresponding coil groups. It is provided in advance so as to position the article 50 so that the magnetic body 51 provided on the article 50 is detected by the detection coils 13 and 14.

  Moreover, although the said embodiment demonstrated the case where the magnetic body 51 of the multiple piece (in the said embodiment) was provided corresponding to each coil group, this invention is not limited to this. Instead, one magnetic body 51 may be provided.

  Moreover, although the case where the presence or absence of the magnetic body 51 provided in the article 50 is detected has been described in the above embodiment, the present invention is not limited to this. For example, the magnetic body provided in the article 50 The number of 51 may also be detected. In this case, the CPU 22A of the controller 22 specifies the number of magnetic bodies according to the magnitude of the signal level indicated by the digital information output from the signal processing units 21A and 21B. In this case, since not only the position of the magnetic body 51 but also the number of the magnetic bodies 51 is used for specifying the type of the article 50, the number of types of the specified article 50 is significantly increased as compared with the above embodiment. .

  Moreover, in the said embodiment, as shown in FIG. 1 as an example, although the case where the detection part 10 was installed horizontally on a table was demonstrated, this invention is not limited to this, For example, the detection part 10 It is good also as a form which installs vertically on a wall surface or a pillar.

  Further, in the above embodiment, the case where the detection waveform information obtained by moving average for each predetermined period is applied is described, but the present invention is not limited to this, for example, It is good also as a form which applies instantaneous waveform information, without taking a moving average.

  Moreover, in the said embodiment, although the case where it alert | reports that the kind of article | item 50 was not able to be specified by making the warning lamp 30 light-emit was demonstrated, this invention is not limited to this, For example, Other notification forms such as notification by voice through a speaker or the like, notification by an external device via a communication line, or the like may be used.

  In the above embodiment, the case where the detection coils 13 and 14 are connected so that the winding directions are reversed and the alternating currents induced by the alternating magnetic field in the detection coils 13 and 14 are mutually canceled has been described. The present invention is not limited to this. For example, the analog signals of the detection coils 13 and 14 may be converted into digital signals and then the difference may be obtained to cancel the alternating current. In addition, the detection coils do not necessarily need to be in pairs, and may be configured by only one.

  In addition, the configuration of the detection system described in the above embodiment (see FIGS. 1 to 3 and 5) is merely an example, and unnecessary portions may be deleted or new within the scope of the gist of the present invention. Needless to say, you can add parts.

  Furthermore, the processing flow of the article detection processing program described in the above embodiment (see FIG. 7) is also an example, and unnecessary steps can be deleted or new steps can be added without departing from the gist of the present invention. Needless to say, they may be added or the processing order may be changed.

DESCRIPTION OF SYMBOLS 10 Detection part 11A 1st coil group 11B 2nd coil group 11C 3rd coil group 12 Excitation coil 13, 14 Detection coil 15 Excitation current supply part 16 Positioning part 20 Control part 21A, 21B Signal processing part 22 Controller 22A CPU
22B ROM
22C RAM
22D storage unit 30 warning lamp 31 differential amplifier 33 waveform shaping circuit 34 ADC
50 Article 50A Ticket 50B Ticket 50C Ticket

Claims (6)

A magnetic field generating coil for generating an alternating magnetic field in a region to be detected of the article, and a signal induction coil for inducing an electrical signal corresponding to the alternating magnetic field generated by the magnetic field generating coil. A plurality of sets of coils arranged such that the generation directions of the alternating magnetic field generated by the magnetic field generating coils are different from each other;
The axis direction of the easy magnetization axis is included in a predetermined range including the generation direction of the alternating magnetic field generated by the magnetic field generating coils of the coil groups different from each other when positioned in the detection target region. A plurality of types of articles that are provided with a magnetic body and have different predetermined ranges that include the axial direction for each type, and
When the article is positioned in the region to be detected , the plurality of types of induction states of electrical signals by the signal induction coils of the plurality of sets of coils according to a change in magnetic field due to magnetization reversal of the magnetic body A specifying means for specifying the type of the article by associating with the type of the article ,
Having a detection system. The detection system according to claim 1, wherein at least one of the plurality of types of articles includes a plurality of the magnetic bodies corresponding to the plurality of sets of the coil groups. The apparatus further comprises positioning means for positioning the article so that a positional relationship between the article and the plurality of sets of coil groups is a predetermined positional relationship when the type of the article is specified by the specifying means. The detection system according to claim 1 or claim 2. The article is provided with a plurality of the magnetic bodies corresponding to the same coil group,
The said specific | specification part further specifies the number of the magnetic bodies provided in the said article | item based on the signal level of the electrical signal induced | guided | derived to the said signal induction coil. Detection system. A magnetic field generating coil for generating an alternating magnetic field in a region to be detected of the article, and a signal induction coil for inducing an electrical signal corresponding to the alternating magnetic field generated by the magnetic field generating coil. A plurality of sets of coils arranged such that the generation directions of the alternating magnetic field generated by the magnetic field generating coils are different from each other;
The axis direction of the easy magnetization axis is included in a predetermined range including the generation direction of the alternating magnetic field generated by the magnetic field generating coils of the coil groups different from each other when positioned in the detection target region. As described above, for a plurality of types of articles having different predetermined ranges including the axial direction for each type, a set of the plurality of types of articles and the plurality of sets of coil groups Storage means for storing the associated identification information;
The induction state of the electric signal by the signal induction coil of the plurality of sets of coils according to the change of the magnetic field due to the magnetization reversal of the magnetic body when the plurality of types of articles are positioned in the detection target region, and A specifying means for specifying the type of the article based on the identification information stored in the storage means ;
A detection device comprising: A magnetic field generating coil for generating an alternating magnetic field in a region to be detected of the article, and a signal induction coil for inducing an electrical signal corresponding to the alternating magnetic field generated by the magnetic field generating coil. A plurality of sets of coil groups arranged so that the generation directions of alternating magnetic fields generated by the magnetic field generation coils are different from each other, and the magnetic field generation coils of the coil groups different from each other when positioned in the detection target region The predetermined range in which the magnetic body is provided so that the axis direction of the easy magnetization axis is included in the predetermined range including the generation direction of the alternating magnetic field generated by the above, and the axis direction is included for each type Are executed in a detection system having a plurality of different types of articles,
Computer
Detecting means for detecting a change in magnetic field due to magnetization reversal of the magnetic material when the article is positioned in the detection target region;
Specifying means for specifying the type of the article by associating the induction state of the electric signal by the signal induction coil of the plurality of sets of coils according to the detection result by the detecting means with the type of the plurality of articles ; ,
Program to function as.

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