CN100545881C - Tag detection device - Google Patents
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- CN100545881C CN100545881C CNB2006100717698A CN200610071769A CN100545881C CN 100545881 C CN100545881 C CN 100545881C CN B2006100717698 A CNB2006100717698 A CN B2006100717698A CN 200610071769 A CN200610071769 A CN 200610071769A CN 100545881 C CN100545881 C CN 100545881C
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Abstract
The invention provides tag detection device.Leave the tag detection device that receiving coil (24) also can not cause misoperation even the object of the present invention is to provide magnetic labels.Tag detection device of the present invention (10) possesses: apply the excitation unit (12) above the AC magnetic field of the coercitive intensity of magnetic labels; Detect the variation in the magnetic field of inspection area, as the receiving element (14) of received signal output; Extraction is because of the processing unit (16) of the voltage waveform of the higher hamonic wave composition of the magnetization inversion generation of magnetic labels from received signal; Judge the identifying unit that has or not (18) of magnetic labels.
Description
Technical field
The present invention relates to moving of monitored item, prevent the tag detection device that article are stolen with the label that is installed on the trade mark etc.
Background technology
Tag detection device is that the stolen device that magnetic labels prevents article is installed on article.Fig. 7 represents the formation of the tag detection device 40 that in the past used.Tag detection device 50 comprises: field coil 20; Receiving coil 24; Only release from the processing unit 16 of the higher hamonic wave composition of the received signal of receiving coil 24; The amplitude and the pre-set threshold of the voltage signal of the higher hamonic wave composition of extracting out are compared, if the signal also bigger than threshold value then is judged to be the identifying unit 42 of the magnetic labels that whether lost efficacy.Be meant at regular purchase article in this so-called inefficacy,, use failure device to give the magnetic labels high-intensity magnetic field, the state of the big Barkhausen effect that illustrates be arranged to can not cause after even take out under the also no problem situation such as shop.By the having or not of magnetic labels of not losing efficacy judged, judge whether it is the expense of having paid legally.
Above-mentioned field coil 20 grades are arranged among the door.Door generally is configurations relatively at regular intervals such as 2 blocks of plates.In each plate etc., field coil 20 etc. is set.The width of door for example is about 900～1200mm, makes the article that label is installed by here.Receiving coil 24 is 2, as shown in Figure 8, in the inboard of field coil 20 receiving coil 24 is set.The number of turns of field coil 20 and receiving coil 24 is arbitrarily.For the differential amplification of explanation after carrying out, the number of turns of 2 receiving coils 24 is identical.
Magnetic labels forms with amorphous metal.The magnetization inversion phenomenon of the magnetic labels that constitutes with the amorphous metal in the AC magnetic field of assigned frequency excitation is the phenomenon that is called big Barkhausen effect.So-called big Barkhausen effect is in the metal of high magnetic permeability and low-coercivity, if the external magnetic field surpasses the intrinsic threshold value of metal, then forms anti-magnetic region rapidly in metal, thus the phenomenon that the magnetization inversion of mobile neticdomain wall metal finishes.In the magnetic labels of the amorphous metal that has used high magnetic permeability and low-coercivity, cause big Barkhausen effect (Fig. 9) easily.The changes of magnetic field of following the violent magnetization inversion that is caused by big Barkhausen effect is that the higher hamonic wave composition of a certain characteristic frequency and the predetermined frequency component of AC magnetic field are together received by receiving element 14.It can not take place by failure device in big Barkhausen effect.
Processing unit 16 comprises differential amplifier circuit 26, Hi-pass filter 28, low-pass filter 30, ac amplifier circuit 32 etc.Differential amplifier circuit 26 is to obtain the circuit that amplifies from the potential difference (PD) of the received signal of 2 receiving coils 24.Figure 10 is the curve map of an example of the differential amplification of expression, is the received signal of the receiving coil 24 of received signal, the opposing party through sides receiving coil 24 in differential amplifying signal, 2 receiving coils 24 in proper order from top beginning.The longitudinal axis of curve map is 2V/div, and transverse axis is 1msec/div.The center of each its amplitude of waveform is 0V.
Hi-pass filter 28 and low-pass filter 30 can be replaced into bandpass filter.Processing unit 16 connects multistage bandpass filter and ac amplifier circuit 32.
Processing unit 16 obtain by differential amplification 2 receiving coils 24 received signal current potential difference and amplify.Use the circuit of forming by Hi-pass filter 28 and low-pass filter 30 etc. from the received signal that has obtained difference, only to extract the higher hamonic wave composition of following big Barkhausen effect out.If failed magnetic labels is arranged, perhaps there is not magnetic labels, then such received signal is roughly 0V shown in Figure 11 (a), has restrained the voltage that gloomy saltus step causes if the magnetic labels that did not lose efficacy is arranged then big bus occurs shown in Figure 11 (b).
The calculation element 56 of microcomputer etc. compares the amplitude of the signal that is produced by the higher hamonic wave composition of extracting out and the threshold value that is stored in the amplitude in the storage unit 54 in advance, if the signal bigger than this threshold value then is judged to be the magnetic labels (patent documentation 1 (spy opens flat 8-235460 communique (claim 5 or the 6th page))) of not inefficacy.For example, as shown in figure 12, as failed magnetic labels or there is not magnetic labels, the noise of the frequency the same with the signal of wanting to detect only appears then.In addition, as shown in figure 13, have not when the place from the receiving coil to 100mm under the situation of the magnetic labels that lost efficacy, the signal that detects occurs wanting.So because the misoperation of pick-up unit 40 also might appear greatly in this signal than noise.
But, when the distance of magnetic labels and received signal 14 from situation under, the redressing of the size of the variation in the magnetic field that is produced by big Barkhausen effect and distance is inversely proportional to and reduces, because in receiving element 14, receive, the signal amplitude of the higher hamonic wave composition that is produced by magnetic labels becomes and interference noise equal extent or the size below it, thereby can't detect in the method that compares to determine with threshold value.For example, have under the situation of the magnetic labels that did not lose efficacy when the place from the receiving coil to 500mm as shown in figure 14, noise increases.
In addition, under the situation that the interference noise of the value also bigger than threshold value takes place, the magnetic labels that did not lose efficacy is arranged even failed magnetic labels is arranged or do not have to judge by accident to be decided to be under the situation of magnetic labels.
And then, when allowing electrical equipment that motor is installed under near the situation of the action inspection area of door or the door, when motor rotates, have and recur and the higher hamonic wave of the magnetic labels generation of not inefficacy has the situation of the noise of same frequency content.In this case, no matter failed magnetic labels is arranged and do not have the situation of magnetic labels, all judging by accident to be decided to be has the magnetic labels that did not lose efficacy.
As mentioned above, the signal amplitude of the higher hamonic wave composition that is produced by magnetic labels and method that pre-set threshold compares judgement are subjected to the distance limit that can receive, have the problem that causes misinterpretation in addition.If because of this problem waits from the shop etc. when coming out guest misinterpretation takes place, offending situations such as the guest of causing are then arranged, in the device that utilizes above-mentioned method, the situation of the main grade in shop to using expression to hesitate arranged.
Summary of the invention
Thereby, even the object of the present invention is to provide a kind of magnetic labels to leave the tag detection device that also is difficult to cause misoperation from receiving coil 24.
Tag detection device of the present invention is the tag detection device that detects the magnetic labels of being made up of amorphous metal, this magnetic labels is installed on the article by the inspection area, possesses: the excitation unit that applies the AC magnetic field of the coercitive intensity that surpasses above-mentioned magnetic labels; Detect the variation in the magnetic field of above-mentioned inspection area, as the receiving element of received signal output; Extraction is because of the processing unit of the voltage waveform of the magnetization inversion generation of above-mentioned magnetic labels from above-mentioned received signal; The above-mentioned voltage waveform that produces because of magnetization inversion is transformed to the unit of the rectangle wave train, and this unit makes more than or equal to the voltage saturation of threshold value and is transformed to square wave; The unit of predetermined square wave columns as the storage of square wave columns setting value; The unit of above-mentioned square wave columns after the comparison conversion and the above-mentioned square wave columns setting value of storing.
Another tag detection device of the present invention is the tag detection device that detects the magnetic labels of being made up of amorphous metal, this label is installed on the article by the inspection area, possesses: the excitation unit that applies the AC magnetic field of the coercitive intensity that surpasses above-mentioned magnetic labels; Detect the variation in the magnetic field of above-mentioned inspection area, generate the receiving element of received signal output; Extraction is because of the processing unit of the voltage waveform of the magnetization inversion generation of above-mentioned magnetic labels from above-mentioned received signal; The above-mentioned voltage waveform that produces because of magnetization inversion is transformed to the unit of the rectangle wave train, and this unit makes more than or equal to the voltage saturation of threshold value and is transformed to square wave; The minimum value of predetermined square wave columns and maximal value unit as minimum setting value of square wave columns and the storage of rectangle wave train maximum set value; Make first-harmonic zero hand over and be transformed to the unit of square wave; During the regulation behind the certain hour that rising edge or negative edge with above-mentioned square wave are benchmark, the unit that the both sides of the above-mentioned square wave columns after the conversion and minimum setting value of above-mentioned square wave columns of storing and above-mentioned square wave columns maximum set value are compared.
If employing the present invention is because judge having or not of magnetic labels with the square wave columns, so even under the situation of the distance of magnetic labels and receiving element, also The noise detects magnetic labels reliably without interruption.In addition, even in the magnetic labels that lost efficacy or do not have under the situation of magnetic labels, also can prevent to judge by accident and be decided to be the phenomenon that the magnetic labels that did not lose efficacy is arranged.
If utilize 3 conditions in the judgement that has or not of the magnetic labels that did not lose efficacy, then can prevent the misinterpretation that causes because of near the electrical equipment of the installation motor door etc. from becoming the high device of reliability.
Description of drawings
Fig. 1 is the figure of the formation of expression tag detection device of the present invention.
Fig. 2 is the figure of the rectangle wave train of expression when not having magnetic labels.
Fig. 3 is the figure that represents the rectangle wave train of magnetic labels when leaving receiving coil 100mm place that do not lose efficacy.
Fig. 4 is the figure that represents the rectangle wave train of magnetic labels when leaving receiving coil 500mm place that do not lose efficacy.
Fig. 5 is the figure of the formation of expression another tag detection device of the present invention.
Fig. 6 (a) is in first-harmonic because the figure that the voltage that the big good gloomy saltus step of Bark causes manifests (b) is the figure of the relation of the expression square wave and the rectangle wave train.
Fig. 7 is the figure that represents the formation of tag detection device in the past.
Fig. 8 is the figure when being accommodated in field coil and receiving coil in the door.
Fig. 9 is the figure of the B-H loop of expression amorphous metal.
Figure 10 is the curve map of the differential amplification of expression, and beginning from above is through the received signal of a receiving coil in differential amplifying signal, 2 receiving coils, the received signal of another receiving coil.
Figure 11 is the figure that detects the voltage that is caused by the good gloomy saltus step of big Bark, (a) is the figure that does not have magnetic labels, (b) is the figure of label of being magnetic.
Figure 12 is the figure of the noise of expression when not having magnetic labels.
Figure 13 is the figure that represents the reception result of magnetic labels when leaving receiving coil 100mm place that do not lose efficacy.
Figure 14 is the figure that represents the reception result of magnetic labels when leaving receiving coil 500mm place that do not lose efficacy.
Embodiment
Use description of drawings tag detection device of the present invention.Tag detection device is the device of a shape, be arranged on pharmacy and bookstore and with the place, gateway in the shop of selling or hire out article such as jewel noble metal, glasses, video-tape, CD etc., label is installed on article, the information of the label when reading by door (surveyed area) judges whether it is the expense of having paid legally.The kind of the read method of label information has electric wave formula, electromagnetic wave type, magnetic-type.The present invention relates to adopt the label of magnetic read method.
Magnetic labels is made up of the amorphous metal that with iron, nickel, cobalt, molybdenum etc. is principal ingredient.The magnetic labels that comprises by amorphous metal has tag-shaped and wire clamp (fastener) shape.
As shown in Figure 1, tag detection device 10 of the present invention possesses: apply the excitation unit 12 above the AC magnetic field of the coercitive intensity of magnetic labels; Detect the variation in the magnetic field of inspection area, with its receiving element of exporting as received signal 14; From the processing unit 16 of received signal extraction because of the voltage waveform of the higher hamonic wave composition of the magnetization inversion generation of magnetic labels; Judge the identifying unit 18 that unit is arranged of the magnetic labels that did not lose efficacy.
Receiving element 14 is made up of the receiving coil 24 in the magnetic field that is used to receive field coil 20 outputs.If the magnetic labels of Shi Xiaoing is not in the inspection area then produce the variation in the magnetic field that causes because of Barkhausen effect greatly.1 field coil 20 is provided with 2 receiving coils 24.The number that the winding number of 2 receiving coils 24 is identical or approaching.The AC magnetic field of 24 pairs of surveyed areas of receiving coil detects, and exports as received signal.
Processing unit 16 is made up of the mimic channel of handling received signal.Mimic channel takes out the waveform because of the magnetization inversion generation of magnetic labels.As concrete circuit, as the conventional art explanation, comprise differential amplifier circuit 26, Hi-pass filter 28, low-pass filter 30, ac amplifier circuit 32 etc.The voltage waveform that produces because of magnetization inversion is about 3000～7000Hz, it is desirable to the waveform of the special frequency band of about 4000～6000Hz.
Judging unit 18 possesses: the unit 34 that the voltage waveform that produces because of magnetization inversion is transformed to the matrix wave train; The unit 36 that predetermined square wave columns is stored as square wave columns setting value; Relatively through the matrix wave train number of conversion and the unit of the square wave columns setting value of storing.And the rectangle wave train is exactly that square wave is arranged, and establishes the number that the square wave columns is the square wave in the rectangle wave train.
The unit 34 that is transformed to the rectangle wave train is to make more than or equal to the voltage saturation of threshold value and be transformed to the circuit of square wave.As illustrating in the conventional art, because the also high situation of voltage that has the voltage ratio that produces by noise to produce by the influence of magnetic labels, so threshold value is that benchmark is determined with the voltage of higher hamonic wave composition, and this higher hamonic wave composition to be the magnetic labels that do not lose efficacy in the inspection area produce because of magnetization inversion when receiving coil 24 leaves farthest.As shown in Figure 3 and Figure 4, more than or equal to the voltage of threshold value and noise until the voltage of regulation and saturated, the summit is transformed to flat square wave.
Above-mentioned square wave columns setting value is in the magnetic labels that lost efficacy or the also square wave columns in the unit interval when the voltage waveform that is produced by noise is transformed to square wave when not having magnetic labels.The unit 36 of storing this square wave columns setting value is storeies that use in computing machine etc.
Unit relatively is the calculation element 38 of microcomputer and timer etc.In this calculation element 38, be included in the situation that the square wave columns in the unit interval Duo than square wave columns setting value and judge to the not unit of the magnetic labels of inefficacy is arranged.Because the square wave that is caused by noise takes place often, so if when detecting square wave more than the square wave columns setting value then know that the magnetic labels that did not lose efficacy is arranged.
Rectangle wave train when Fig. 2 represents not have magnetic labels.Expression is from receiving element to 100mm with the rectangle wave train of 500mm when the magnetic labels of inefficacy is arranged not in Fig. 3 and Fig. 4.Even the magnetic labels of Shi Xiaoing is not from receiving coil 500mm at a distance, because comparing the square wave columns with Fig. 2 increases, so know that the magnetic labels that did not lose efficacy is arranged yet.
As mentioned above, even the present invention's magnetic labels far away apart from receiving element 14 can not be subjected to The noise yet and detects.In addition and the tag detection device of electric wave formula relatively, do not have the influence of mobile phone electric wave etc., in label detects, be favourable.
The present invention more than has been described, but the present invention is not limited to above-mentioned embodiment.For example, be tag detection device 10b shown in Figure 5.Mark identical symbol in the drawings with the tag detection device 10 identical parts of the Fig. 1 that illustrates previously, and omit its explanation.
The identifying unit 19 of Fig. 6 possesses: the unit 34 that the voltage waveform that produces because of magnetization inversion is transformed to the rectangle wave train; The unit 37 that the minimum value of predetermined square wave columns and maximal value are stored as the minimum setting value of square wave columns and square wave columns maximum set value; First-harmonic zero is handed over it is transformed to the unit 41 of square wave; In the official hour behind the certain hour that rising edge and negative edge with square wave are benchmark, the unit that the both sides through minimum setting value of the square wave columns of conversion and the square wave columns of storing and square wave columns maximum set value are compared.And the rectangle wave train is exactly that square wave is arranged, and establishes the number that the square wave columns is the square wave in the rectangle wave train.
Shown in Fig. 6 (a), the voltage 46 by the good gloomy saltus step generation of big Bark appears in the voltage waveform of extracting out in differential amplifier circuit 26 near the summit of the amplitude of first-harmonic (sine wave) 44.The voltage 46 that is produced by this first-harmonic 44 and the good gloomy saltus step of big Bark is only extracted the higher hamonic wave part out by Hi-pass filter 28 etc., and the unit 34 that usefulness is transformed to the rectangle wave train is transformed to the rectangle wave train 48 shown in Fig. 6 (b).In addition, in first-harmonic 44, also comprise the noise 46a that produces by various main causes, occur, also occurring removing on the part in addition on the summit of the amplitude of first-harmonic 44.Even noise 46a is if more than or equal to then being transformed to rectangle wave train 48a on the above-mentioned threshold value.And, in Fig. 6 (a), left near the place the summit noise 46a has been shown, and also comprised near the summit sometimes.
The minimum setting value of above-mentioned square wave columns is in the magnetic labels that inefficacy is arranged or do not have under the situation of magnetic labels, be behind the certain hour that rising edge or negative edge with square wave 47 are benchmark determined during in the square wave columns that causes by noise.Square wave columns maximum set value is the value value afterwards that adds the minimum setting value of square wave columns on the rectangle wave number in addition, and this rectangle wave number is the rectangle wave number when the voltage waveform that produces because of the magnetic labels that did not lose efficacy is transformed to square wave.Mostly rectangle wave number when the voltage waveform that produces with the magnetic labels that did not lose efficacy is transformed to square wave is 2～6 value as an example.The unit 37 of storing minimum setting value of this square wave columns and square wave columns maximum set value is storeies of using in computing machine etc.
The unit 41 that is transformed to square wave is moment of 0V at the first-harmonic 44 shown in Fig. 6 (a), generates the square wave 47 that is made of rising edge or negative edge shown in Fig. 6 (b).The frequency of first-harmonic 44 for example is about 300Hz.
And square wave is the logical and disconnected voltage that repeats at each stipulated time, establishes square wave and be the voltage of logical and disconnected asynchronism(-nization).
Unit relatively is the calculation element 40 of microcomputer and timer etc.Shown in Fig. 6 (b), the unit that compares is being that the square wave columns between time t1～t2 behind the certain hour of benchmark and the both sides of minimum setting value of square wave columns and square wave columns maximum set value compare with time ta for example.This is to utilize voltage 46 by the good gloomy saltus step generation of big Bark to appear near this point summit of amplitude of first-harmonic 44.Promptly, because the voltage 46 that is produced by the good gloomy saltus step of big Bark periodically appears near the summit of amplitude of first-harmonic 44, if, then can reduce the influence that produces by noise in this periodic certain hour so the both sides of the matrix wave train number of the square wave that occurs and square wave columns maximum set value and the minimum setting value of square wave columns are compared.In Fig. 6 (b), rectangle wave train 48a is produced by noise 46a, so and because beyond during time t1～t2 it is ignored.
Identifying unit 19 comprises the unit 42 of number of times bigger than the minimum setting value of square wave columns and that produce continuously smaller or equal to the rectangle wave train of square wave columns as the read-around ratio storage.The unit of storing this read-around ratio is storer that uses in computing machine etc.The unit of symbol 37 and 42 storage also can belong to 1 storer.
Possesses such unit, promptly, result by the comparison of the unit that compares, be under big and the state of than square wave columns minimum setting value at the square wave columns, and recurred when this state under the situation of above-mentioned read-around ratio and be judged to be the magnetic labels that did not lose efficacy smaller or equal to square wave columns maximum set value.Utilize above-mentioned 3 value conditions to judge in the present invention, improve the precision of judging.
Utilize Fig. 6 (b) explanation for the method for judging.For example, the unit that compares is that benchmark carries out above-mentioned comparison with the rising edge of square wave 47.In addition, the minimum setting value of square wave columns is stored as 2, square wave columns maximum set value is stored as 6, read-around ratio is stored as 3 times.The moment of 3 of time ta, tc, te continuous rising edges as benchmark, the both sides of minimum setting value of the square wave columns between time t1～t2 and square wave columns and square wave columns maximum set value are compared.Under the situation of Fig. 6 (b), in whole during the time t1～t2 that with the moment is benchmark at 3 of time ta, tc, te continuous rising edges, because the square wave columns is 5, so satisfy the minimum setting value 2 of square wave columns, square wave columns maximum set value 6, the full terms that read-around ratio is 3 times is judged to be the magnetic labels that did not lose efficacy.
If adopt the present invention of above explanation, then when producing the rectangle wave train because of The noise, and because of noise take place that the rectangle wave train takes place the time be engraved under near the situation about occurring the summit of amplitude of first-harmonic 44, even the square wave columns that is caused by noise is bigger than the minimum setting value of square wave columns and the situation smaller or equal to square wave columns maximum set value under, as long as the read-around ratio that this state is not stored, just can not judge by accident to be decided to be has the magnetic labels that did not lose efficacy.Thereby, judge the mode height that ratio of precision just compares square wave columns and square wave columns minimum setting value and square wave columns maximum set value both sides.For example, the many frequencies (50Hz and 60Hz) in the general electric system of using of noise take place down, if the frequency of first-harmonic 44 is 300Hz approximately, then noise and first-harmonic 44 have the difference on the frequency of 5 times or 6 times, and identifying unit 19 can misinterpretation.
In addition, if adopt the present invention, can be because of the electrical equipment misinterpretation of motor is not installed.For example, when the zoom function of digital camera that built-in motor is installed and mobile phone under near the situation of moving the surveyed area of door and the door, when built-in motor rotates, recur sometimes and by the noise that the higher hamonic wave that the magnetic labels that did not lose efficacy produces has a same frequency content.At this moment, might judge by accident to be decided to be has the magnetic labels that did not lose efficacy, but because more than the square wave columns square wave columns maximum set value that the noise that in most cases recurs causes, thereby the probability of misinterpretation is low.The present invention becomes seldom misinterpretation by the condition of utilizing the minimum setting value of square wave columns, square wave columns maximum set value, read-around ratio 3 times, becomes easy-to-use device.By 3 condition enactments are the best high device of reliability that becomes.
And, though utilized the rising edge of the square wave 47 of Fig. 6 (b), also can utilize negative edge.In addition, also can utilize the both sides of rising edge and negative edge.
In addition, the present invention can be in the scope that does not break away from its main contents implements under the knowledge according to those skilled in the art applies the state of various improvement, correction, change.
Claims (4)
1. tag detection device detects the magnetic labels of being made up of amorphous metal that is installed in by on the article of inspection area, it is characterized in that comprising:
Apply the excitation unit of the AC magnetic field of the coercitive intensity that surpasses above-mentioned magnetic labels;
Detect the variation in the magnetic field of above-mentioned inspection area, as the receiving element of received signal output;
From above-mentioned received signal, extraction is because of the processing unit of the voltage waveform of the magnetization inversion generation of above-mentioned magnetic labels;
The above-mentioned voltage waveform that produces because of magnetization inversion is transformed to the unit of the rectangle wave train, and this unit makes more than or equal to the voltage saturation of threshold value and is transformed to square wave;
The unit of predetermined square wave columns as the storage of the square wave columns value of setting;
The unit that above-mentioned square wave columns after the conversion and the above-mentioned square wave columns setting value of storing are compared.
2. tag detection device as claimed in claim 1 is characterized in that:
Be provided with under the situation of above-mentioned matrix wave train number, be judged to be the unit of the magnetic labels that did not lose efficacy more than square wave columns setting value.
3. tag detection device detects the magnetic labels of being made up of amorphous metal that is installed in by on the article of inspection area, it is characterized in that comprising:
Produce the excitation unit of the AC magnetic field of the coercitive intensity that surpasses above-mentioned magnetic labels;
Detect the magnetic field of above-mentioned inspection area, generate the receiving element of received signal;
From above-mentioned received signal, extraction is because of the processing unit of the voltage waveform of the magnetization inversion generation of above-mentioned magnetic labels;
The above-mentioned voltage waveform that produces because of magnetization inversion is transformed to the unit of the rectangle wave train, and this unit makes more than or equal to the voltage saturation of threshold value and is transformed to square wave;
The unit that the minimum value of predetermined square wave columns and maximal value are stored as the minimum setting value of square wave columns and square wave columns maximum set value respectively;
Make first-harmonic zero hand over and be transformed to the unit of square wave;
At rising edge or negative edge with above-mentioned square wave is in the official hour of benchmark, the unit that the above-mentioned square wave columns after the conversion and minimum setting value of the above-mentioned square wave columns of storing and above-mentioned square wave columns maximum set value both sides are compared.
4. tag detection device as claimed in claim 3 is characterized in that comprising:
Greater than minimum setting value of above-mentioned square wave columns and the unit stored as read-around ratio smaller or equal to the number of times that the rectangle wave train of above-mentioned square wave columns maximum set value recurs;
When above-mentioned square wave columns has recurred under the situation of above-mentioned read-around ratio greater than the minimum setting value of above-mentioned square wave columns and smaller or equal to the state of above-mentioned square wave columns maximum set value, be judged to be the unit of the magnetic labels that did not lose efficacy.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005085255A JP4602811B2 (en) | 2005-03-24 | 2005-03-24 | Tag detection device |
| JP2005085255 | 2005-03-24 | ||
| JP2005343064 | 2005-11-29 |
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| Publication Number | Publication Date |
|---|---|
| CN1838192A CN1838192A (en) | 2006-09-27 |
| CN100545881C true CN100545881C (en) | 2009-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100717698A Expired - Fee Related CN100545881C (en) | 2005-03-24 | 2006-03-23 | Tag detection device |
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| JP (1) | JP4602811B2 (en) |
| CN (1) | CN100545881C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8264348B2 (en) * | 2009-08-03 | 2012-09-11 | Sensormatic Electronics, LLC | Interference detector resulting in threshold adjustment |
| CN103142231B (en) * | 2013-02-16 | 2015-05-13 | 深圳市资福技术有限公司 | Device and method for detecting harmonic waves of capsule endoscope |
| CN106652294B (en) * | 2016-12-22 | 2019-04-30 | 思创医惠科技股份有限公司 | Burglary-resisting system decoder detection device |
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| US5289543A (en) * | 1989-02-10 | 1994-02-22 | Avr Communications Ltd. | FM receiver and communication systems including same |
| CN1173067A (en) * | 1996-05-14 | 1998-02-11 | 株式会社日立制作所 | PWM inverter apparatus |
| EP1096451A1 (en) * | 1999-11-01 | 2001-05-02 | N.V. Bekaert S.A. | Detection method of semi-soft security features |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2006268399A (en) | 2006-10-05 |
| CN1838192A (en) | 2006-09-27 |
| JP4602811B2 (en) | 2010-12-22 |
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