CN1145910C - Magnetic object monitoring device - Google Patents
Magnetic object monitoring device Download PDFInfo
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- CN1145910C CN1145910C CNB001037692A CN00103769A CN1145910C CN 1145910 C CN1145910 C CN 1145910C CN B001037692 A CNB001037692 A CN B001037692A CN 00103769 A CN00103769 A CN 00103769A CN 1145910 C CN1145910 C CN 1145910C
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Abstract
To provide a magnetic type article monitoring device by which a tag is surely detected in a gate. A pair of energizing coils 1a and 1b constituted by respectively superimposing a pair of main coils 4 and 6 and auxiliary coils 5 and 7 , which are arranged at prescribed interval in a way that each part is opposite to the other. A part between the energizing coils 1a and 1b is made to be the gate for passing through the tag 3 and a detection coil is disposed in the gate, which detects that the magnetic flux densities of magnetic fields generated by the respective energizing coils 1a and 1b are changed by the passing-through of the tag 3. Electromagnetic waves are not cancelled each other in any one of X, Y and Z directions in the gate 2 so that the tag 3 is surely detected.
Description
The present invention relates to by discerning and detect that thereby moving of article can be in shop etc. be attached to mark on the commodity etc. and find the magnetic object monitoring device of the stolen usefulness of commodity etc., thereby especially relate to by also this signal and setting being compared the magnetic object monitoring device that detection has or not the mark with above-mentioned magnetic component by detecting the caused signal of this change in magnetic flux density that records because of being exposed to the magnetic component that change in magnetic flux density takes place in the magnetic field with coil by discerning this mark to being attached to the mark that has magnetic component on the article such as commodity.
In of the explanation of this instructions to the present invention or conventional example, to be decomposed into directions X, Y direction, Z direction and describe by flowing through the electromagnetic direction that produces with the exciting current that forms a pair of field coil that monitors gateway opposite each other, suppose that directions X represents to link two horizontal directions, horizontal depth direction (being, horizontal direction parallel with the moving direction that adds underlined thing), the Z direction indication vertical direction of the rectangular supervision gateways of direction between two field coils of Y direction indications and binding between the field coil.
In magnetic object monitoring device in the past, field coil that applies the regulation excitation signal and the magnetic test coil that detects magnetic field are oppositely arranged, between forms and monitors gateway, and when the article with the mark with magnetic material move through this supervision gateway, detect the change in magnetic flux density that the magnetic field of origin self-excitation coil produces by magnetic test coil in mark, and under defined terms, judge the magnetic field exist from mark, thereby mark mobile is judged as moving of commodity etc., thereby can prevents commodity etc. stolen in shop etc.In addition, the electric current of the field coil that uses in above-mentioned magnetic object monitoring device structurally, as Fig. 7 or shown in Figure 10, only makes it flow along same direction or reverse direction.
Fig. 7~Fig. 9 illustrates the 1st conventional example, Fig. 7 forms the simple oblique view that monitors the magnetic object monitoring device after the gateway by the identical a pair of field coil of exciting current direction, Fig. 8 be expression observe Fig. 7 from the top the supervision gateway time the vertical view of magnetic direction, the front elevation of the magnetic direction when Fig. 9 is expression from the supervision gateway of forward observation Fig. 7.In addition, Figure 10~Figure 12 illustrates the 2nd conventional example, Figure 10 forms the simple oblique view that monitors after the gateway by exciting current direction pair of opposite field coil, Figure 11 be expression observe Figure 10 from the top the supervision gateway time the vertical view of magnetic direction, the front elevation of the magnetic direction when Figure 12 is expression from the supervision gateway of forward observation Figure 10.Here, in above-mentioned Fig. 8, Fig. 9, Figure 11 and Figure 12, black arrow is represented the flow direction of electric current, and hollow arrow is represented magnetic direction, and wide arrow is represented the electromagnetic wave direction.
Above-mentioned the 1st conventional example, as Fig. 8 and shown in Figure 9, electromagnetic wave, though the identical thereby mutual enhancing of direction each other on directions X, on Y direction and Z direction, then cancel out each other, particularly, be zero at the central portion that monitors gateway, thereby can not detect from the changes of magnetic field of passing through here that mark produced.And above-mentioned the 2nd conventional example, as Figure 11 and shown in Figure 12, electromagnetic wave, though the identical thereby mutual enhancing of direction each other on Y direction and Z direction, then cancelling out each other on directions X, particularly, is zero at the central portion that monitors gateway, thereby can not detect, so exist the problems referred to above in the prior embodiment here from the changes of magnetic field of passing through that mark produced.
The present invention, to address the above problem is problem, and its objective is provides a kind of electromagnetic wave that makes the whichever direction of directions X, Y direction, Z direction to play effective function so that the magnetic object monitoring device that can both detect the mark that passes through in any position that monitors gateway.
For achieving the above object, the described the present invention of part 1, be also thereby this signal and setting to be compared the magnetic object monitoring device that detection has or not the mark with above-mentioned magnetic component by detecting the caused signal of this change in magnetic flux density that records because of being exposed to the magnetic component that change in magnetic flux density takes place in the magnetic field with coil, it is characterized in that: under the state parallel with the moving direction of the article of attach mark, flow through the part of electric current and flow through a pair of field coil that two coils of the part of electric current overlap along different directions having respectively on the Y direction that makes separately in level and the vertical Z direction along equidirectional, so that the part mode respect to one another that flows through the part of electric current and flow through electric current along different directions along equidirectional arranged spaced in accordance with regulations, formation makes and is marked at the supervision gateway of passing through between two coils, and is provided with the magnetic test coil that the magnetic flux density in the magnetic field that produced in this supervision gateway by above-mentioned each field coil is detected along with the variation of passing through to take place of above-mentioned mark.
In addition, the described the present invention of part 2, be also thereby this signal and setting to be compared the magnetic object monitoring device that detection has or not the mark with above-mentioned magnetic component by detecting the caused signal of this change in magnetic flux density that records because of being exposed to the magnetic component that change in magnetic flux density takes place in the magnetic field with coil, it is characterized in that: under the state parallel with the moving direction of the article of attach mark, with make outside branch road from the ancillary coil that is connected of interflow branch road of both sides and central authorities overlap with the main coil that on the Y of level direction and vertical Z direction, flows through electric current respectively along a direction and the field coil of formation and make outside the ancillary coil that is connected with central interflow branch road from both sides of branch road and the field coil that constitutes along overlapping with main coil that the direction of the current opposite in direction of the main coil of above-mentioned field coil flows through electric current, so that the part mode respect to one another that flows through the part of electric current and flow through electric current along different directions along equidirectional arranged spaced in accordance with regulations, formation makes and is marked at the supervision gateway of passing through between two coils, and is provided with the magnetic test coil that the magnetic flux density in the magnetic field that produced in this supervision gateway by above-mentioned each field coil is detected along with the variation of passing through to take place of above-mentioned mark.
Fig. 1 is the exploded perspective view of field coil.
Fig. 2 is from monitoring the inboard stretch-out view of observing two field coils of gateway.
Fig. 3 is the synoptic diagram of the asynchronous expression electromagnetic wave of the size of current direction of main coil when observe monitoring gateway from the top and ancillary coil.
Fig. 4 is the synoptic diagram of the expression electromagnetic wave direction of the size of current of main coil and ancillary coil when observe monitoring gateway from top when identical.
Fig. 5 is the stretch-out view when monitoring that gateway is inboard and observe field coil and magnetic test coil of another example.
Fig. 6 is the stretch-out view when monitoring that gateway is inboard and observe field coil and magnetic test coil of other examples.
Fig. 7 is the oblique view of the field coil of the 1st conventional example.
Fig. 8 is the synoptic diagram of observing the expression electromagnetic wave direction when monitoring gateway from the top of the 1st conventional example.
Fig. 9 is the synoptic diagram of representing the electromagnetic wave direction when top view monitors gateway of the 1st conventional example.
Figure 10 is the oblique view of the field coil of the 2nd conventional example.
Figure 11 is the synoptic diagram of observing the expression electromagnetic wave direction when monitoring gateway from the top of the 2nd conventional example.
Figure 12 is the synoptic diagram of the expression electromagnetic wave direction when top view monitors gateway of the 2nd conventional example.
Below, the best example that present invention will be described in detail with reference to the accompanying.Wherein, Fig. 1~Fig. 4 of accompanying drawing illustrates example of the present invention, Fig. 1 is the exploded perspective view of the field coil that is made of a pair of main coil and ancillary coil, Fig. 2 is from monitoring the inboard stretch-out view of observing the field coil that is made of a pair of main coil and ancillary coil of gateway, Fig. 3 is the main coil of expression when observe monitoring gateway from the top and the synoptic diagram of the asynchronous electromagnetic wave direction of size of current of ancillary coil, the synoptic diagram of the electromagnetic wave direction of Fig. 4 when to be the main coil of expression when observe monitoring gateway from the top identical with the size of current of ancillary coil, Fig. 5 and Fig. 6 are the stretch-out views when monitoring a pair of field coil of the inboard observation of gateway of other examples.
As shown in Figure 1, magnetic object monitoring device, structurally, record because of being exposed to the caused signal of this change in magnetic flux density of the mark that has magnetic component 3 that change in magnetic flux density takes place in the magnetic field in the supervision gateway 2 between a pair of field coil 1a, 1b by the test section (not shown), and this signal and setting compared, have or not above-mentioned mark 3 thereby detect.Promptly, above-mentioned test section, has well-known structure, disposing on each panel (not shown) of above-mentioned each field coil 1a, 1b, be provided with the magnetic test coil (not shown) that fits together with above-mentioned each field coil 1a, 1b, and detect of the variation passing through take place of the magnetic flux density in the magnetic field that in this monitors gateway 2, produces by above-mentioned each field coil 1a, 1b along with above-mentioned mark 3 by this magnetic test coil.In addition, above-mentioned mark 3 for example, anchors at the magnetic component (not shown) on the label body by tabular or membranaceous formation that constitutes with paper or vinyl etc., with cementing agent it is bonded in then on the suitable face of article such as commodity.
Field coil 1a, 1b, place, the gateway configuration relative to one another in the shop etc. and be enough to interval that the people is passed through apart is by well-known excitation division (not shown) excitation and the magnetic field that produces regulation.On the other hand, the test section (not shown), when the supervision gateway 2 of mark 3 between above-mentioned field coil 1a, 1b by the time detect the pulse signal that produces by this mark 3, the signal that variation by the magnetic field that intersects with above-mentioned magnetic test coil is produced amplifies, and it is transformed to the required signal level of signal Processing etc., be input to the control part (not shown) then.
Excitation division has not shown digital to analog converter, low-pass filter and excitation amplifier.
Above-mentioned digital to analog converter is used for the digital SIN ripple from control part output is converted to simulation SIN ripple, and this SIN ripple puts on field coil 1a, 1b, in control part, by carrying out well-known SIN ripple generation program, exports digital SIN ripple signal.In addition, above-mentioned low-pass filter is used for the unwanted high fdrequency component that the simulation SIN ripple signal from digital to analog converter output is contained is removed, thereby obtains the following signal of assigned frequency.Further, the excitation amplifier is used for the SIN ripple signal by low-pass filter input is amplified and outputs to field coil 1a, 1b, is enough to magnetic field that mark 3 is detected so that produced by field coil 1a, 1b.
On the other hand, not shown test section has above-mentioned magnetic test coil, differential amplifier, notch filter, bandpass filter, level adjustment amplifier, reaches analog to digital converter.
Above-mentioned differential amplifier has well-known structure, is used for the signal that is detected by magnetic test coil is carried out differential amplification and it is amplified to the degree that is enough to the unwanted signal of late-class circuit is removed also exporting.In addition, above-mentioned notch filter is used for the carrier component that signal contained that is detected by magnetic test coil after differential amplification is removed, and structurally, so-called trap frequency is set at carrier frequency, and only exports the pulse signal component that is produced by mark 3.In addition, above-mentioned bandpass filter is well-known, is used for further unwanted high frequency and low frequency component being removed from the signal that obtains by notch filter.Further, above-mentioned level adjustment amplifier, the signal that is used for obtaining from bandpass filter is amplified to for the necessary level of the analog to digital converter that is input to its rear-stage side and with its output.
Control part structurally, carries out signal Processing to the signal from the test section input, thereby judge mark 3 passing through between field coil and magnetic test coil, and report to the police by warning portion as required, on the other hand, field coil 1a, 1b are carried out excitation by excitation division.In addition, when being detected the passing through of mark 3 by control part, warning portion carries out actuation of an alarm according to the signal from control part, for example, alarm buzzer is rung etc.
As shown in Figure 1 and Figure 4, an above-mentioned field coil 1a (in Fig. 1~Fig. 4, be positioned at left side), will be on Y direction and Z direction respectively along a direction (in Fig. 2, being clockwise direction) flow through electric current main coil 4 and will along clockwise direction from both sides (Fig. 2) outside branch road 5b of flowing through and in the counterclockwise direction (Fig. 2) outside branch road 5c of flowing through electric current four angles representing by symbol a, b, d, c of being connected in the ancillary coil 5 of central interflow branch road 5a overlap with four angles representing by symbol G, H, J, I.In addition, another field coil 1b, the main coil 6 that will flow through electric current along the direction identical with the main coil 4 of above-mentioned field coil 1a with will be along clockwise direction from both sides (Fig. 2) flow through the outside branch road 7b of electric current and in the counterclockwise direction (Fig. 2) outside branch road 7c of flowing through electric current four angles representing by symbol A, B, D, C of ancillary coil 7 of being connected in the interflow branch road 7a of central authorities overlap with four angles representing by symbol g, h, j, i.So, as mentioned above, between these two field coil 1a, 1b, form the supervision gateway 2 that mark 3 is passed through.
Can know from Fig. 2 and to find out that the flow direction of the electric current with excitation effect of field coil 1a is a → E → F → b → a, the flow direction of the electric current with excitation effect of field coil 1b is C → e → f → D → C.Therefore, when the size of current of main coil 4,6 and ancillary coil 5,7 as shown in Figure 3 not simultaneously, in the supervision gateway 2 between above-mentioned field coil 1a, 1b, electromagnetic wave by current excitation, though there is part at directions X with the effect of cancelling out each other, but because of this part staggers mutually, so do not hinder detection to mark 3.On the other hand, when as shown in Figure 4 above-mentioned electric current big or small identical, the part that on X, Y, Z all directions, does not exist electromagnetic wave to cancel out each other.In addition, in Fig. 3 and Fig. 4, hollow arrow is represented magnetic direction, and wide arrow is represented the electromagnetic wave direction.
Therefore, when the commodity of for example attach mark 3 during by above-mentioned supervision gateway 2, the change in magnetic flux density that can be produced by mark 3 according to the Electromagnetic Wave Detection that is produced by field coil 1a, 1b by the magnetic test coil (not shown) is also judged the magnetic field that exists from mark 3 under defined terms, thereby can prevent the stolen of commodity etc. in shop etc.
In addition, the present invention is not limited to above-mentioned example, also can on the Y direction that will make separately under the state parallel and vertical Z direction, have respectively along equidirectional and flow through the part of electric current and flow through a pair of field coil that two coils of the part of electric current overlap along different directions so that the part mode respect to one another that flows through the part of electric current and flow through electric current along different directions along equidirectional arranged spaced in accordance with regulations in level with the moving direction of the article of attach mark 3, for example, can adopt as Fig. 5 (from monitoring the inboard field coil 100a that observes of gateway, stretch-out view during 100b, monitor that for forming gateway is configured to make by symbol M, N, O, four angles that P represents with by symbol m, n, o, four angles that p represents are toward each other) shown in field coil 100a, 100b, perhaps, also can adopt as Fig. 6 (from monitoring the inboard field coil 200a that observes of gateway, stretch-out view during 200b monitors that for forming gateway is configured to make by symbol S, T, U, four angles that V represents with by symbol s, t, u, four angles that v represents are toward each other) shown in field coil 200a, 200b.In addition, except that as above-mentioned example, in the shop, being used to prevent that commodity are stolen, can also in the Art Museum, be used to prevent having things stolen of artistic products etc.
As mentioned above, the described the present invention of part 1, electromagnetic wave by a pair of field coil excitation, on any one direction of directions X, Y direction, Z direction, all exist, so, no matter mark can detect it by monitoring which part of gateway, thereby has the effect that moves of monitored item reliably.
The described the present invention of part 2, with make outside branch road from both sides overlap with the main coil that flows through electric current along a direction with the ancillary coil that is connected of interflow branch road of central authorities and the field coil of formation and make outside the ancillary coil that is connected with central interflow branch road from both sides of branch road and the field coil that constitutes along overlapping with main coil that the direction of the current opposite in direction of the main coil of above-mentioned field coil flows through electric current, so that the part mode respect to one another that flows through the part of electric current and flow through electric current along different directions along equidirectional arranged spaced in accordance with regulations, therefore, electromagnetic wave by a pair of field coil excitation, at directions X, the Y direction, all exist on any one direction of Z direction, so, no matter mark is by monitoring which part of gateway, can detect it, thereby have the effect that moves of monitored item more reliably.
Claims (2)
1. magnetic object monitoring device, record because of being exposed to the caused signal of this change in magnetic flux density of the magnetic component that change in magnetic flux density takes place in the magnetic field with coil by detecting, and this signal and setting compared, have or not mark thereby detect with above-mentioned magnetic component, this magnetic object monitoring device is characterised in that: parallel with the moving direction of the article of attach mark, have respectively on the Y direction of level and the vertical Z direction: on the main coil that electric current one direction flows through, outside branch road is connected from the interflow branch road of both sides with central authorities, and with at above-mentioned interflow branch road, electric current overlaps and the field coil of formation at the ancillary coil that same direction flows through, with on the main coil that flows through on the direction of the current opposite in direction of the main coil of electric current and above-mentioned field coil, outside branch road is connected from the interflow branch road of both sides with central authorities, and with at above-mentioned interflow branch road, the ancillary coil that electric current flows through on same direction overlaps and the field coil of formation, leave the interval of regulation and dispose, so that electric current with each ancillary coil on the part that flows through on the equidirectional of the main coil that overlaps and the part that on different directions, flows through relative to each other, formation is marked at the supervision gateway of passing through between two coils, and setting detects the magnetic flux density in the magnetic field that is produced by above-mentioned each field coil at the magnetic test coil that pass through caused variation of this supervision gateway owing to above-mentioned mark.
2. magnetic object monitoring device, record because of being exposed to the caused signal of this change in magnetic flux density of the magnetic component that change in magnetic flux density takes place in the magnetic field with coil by detecting, and this signal and setting compared, have or not mark thereby detect with above-mentioned magnetic component, this magnetic object monitoring device is characterised in that to have: outside branch road is connected from the interflow branch road of both sides with central authorities, and with at above-mentioned interflow branch road, the ancillary coil of formation overlaps and the field coil of formation electric current on the main coil that same direction flows through electric current a plurality of streams of circulation on same direction being connected, with will the same direction opposite with the ancillary coil of above-mentioned field coil on a plurality of streams of electric current circulation be connected and the ancillary coil that constitutes, with with outside branch road from both sides with central authorities the interflow branch road be connected, and with at above-mentioned interflow branch road, electric current overlaps and the field coil of formation at the main coil that same direction flows through, leave the interval of regulation and dispose, so that electric current with each ancillary coil on the part that flows through on the equidirectional of the main coil that overlaps and the part that on different directions, flows through relative to each other, formation is marked at the supervision gateway of passing through between two coils, and setting detects the magnetic flux density in the magnetic field that is produced by above-mentioned each field coil at the magnetic test coil that pass through caused variation of this supervision gateway owing to above-mentioned mark.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11218658A JP2001043459A (en) | 1999-08-02 | 1999-08-02 | Magnetic type article monitoring device |
JP218658/1999 | 1999-08-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1282945A CN1282945A (en) | 2001-02-07 |
CN1145910C true CN1145910C (en) | 2004-04-14 |
Family
ID=16723404
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CNB001037692A Expired - Fee Related CN1145910C (en) | 1999-08-02 | 2000-03-09 | Magnetic object monitoring device |
Country Status (3)
Country | Link |
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JP (1) | JP2001043459A (en) |
CN (1) | CN1145910C (en) |
TW (1) | TW469417B (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4544283B2 (en) * | 2007-09-19 | 2010-09-15 | 富士ゼロックス株式会社 | Carriage management gate |
JP5691594B2 (en) * | 2011-02-09 | 2015-04-01 | 富士ゼロックス株式会社 | Detection device and processing system |
US8576114B2 (en) * | 2011-06-24 | 2013-11-05 | Thales Canada Inc. | Location of a transponder center point |
CN106710855B (en) * | 2017-02-09 | 2024-06-04 | 东莞市华盾电子科技有限公司 | Coil structure of passing detector and passing detector |
CN106842336A (en) * | 2017-02-09 | 2017-06-13 | 王积东 | By formula detector and by formula detection method |
KR102268177B1 (en) * | 2021-02-02 | 2021-06-22 | (주)그린아이티코리아 | Access control system using magnetic sensor with detection area designation structure |
-
1999
- 1999-08-02 JP JP11218658A patent/JP2001043459A/en active Pending
-
2000
- 2000-02-17 TW TW89102724A patent/TW469417B/en not_active IP Right Cessation
- 2000-03-09 CN CNB001037692A patent/CN1145910C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CN1282945A (en) | 2001-02-07 |
JP2001043459A (en) | 2001-02-16 |
TW469417B (en) | 2001-12-21 |
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