CN1991858A - Reader arrangement for an electronic identification system - Google Patents
Reader arrangement for an electronic identification system Download PDFInfo
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- CN1991858A CN1991858A CNA2006100958849A CN200610095884A CN1991858A CN 1991858 A CN1991858 A CN 1991858A CN A2006100958849 A CNA2006100958849 A CN A2006100958849A CN 200610095884 A CN200610095884 A CN 200610095884A CN 1991858 A CN1991858 A CN 1991858A
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Abstract
A reader arrangement 22 for an electronic identification system includes a plurality of reader heads 22.1 to 22.4 for energizing transponders 28.1 to 28.n to be read, and a controller 29 therefor. The controller 29 switches activation of the reader heads in a multi-phase sequential pattern including a first phase for activating a first set 22.1 and 22.3 of the reader heads and at least one further phase for activating a further set 22.2 and 22.4 of the reader heads. The switching is such that a complete cycle plus at least the first phase of a subsequent cycle is completed within a time period not longer than a reset period of the transponders.
Description
The application be submitted on August 28th, 1998, application number be 200410045765.3, dividing an application of being entitled as " reading device of electronic recognition system ".
Technical field
The present invention relates to comprise the electronic recognition system of inquisitor and a plurality of transponders.The present invention is specifically related to form the interrogator or the reader of the part of system of this system, particularly radio frequency (RF).
Background technology
The electronic recognition system of known mentioned kind comprises a reader, and it comprises an inquisitor, is used for being used for from the receiver of transponders reception response signal to the transmitter and of transponders transmission energy field or interrogating signal.A microprocessor in reader is discerned a specific transponders according to the unique cognizance code data of transponders of a part that forms the backscattering response signal.In case reader is received the cognizance code data and has been discerned transponders, reader promptly sends a confirmation signal to this transponders, this transponders is switched to dormancy (catnap) pattern, transponders stops the response to interrogating signal in this pattern, but still is energized.Pumping signal from transponders, eliminate during than the reset cycle (generally being less than two seconds) long after, transponders turns back to normal manipulation mode, resembles at transponders under this pattern to respond with the cognizance code data during in excited target foregoing.
Be installed in the applicable cases that the transponders that will be identified on the object need be read a large amount of, may need the energy field of scanned object.According to the scattering and the reflection of energy, one not the long-range transponders in the field may be energized and be read as described above.But along with moving of field, the energy of scattering is also eliminated from the transponders that has just read, so that this transponders switches to normal manipulation mode from park mode.When the energy field of reality when irradiation is to that transponders again later on, that transponders will be read for the second time, causes the error of data read and record.
Goal of the invention
Therefore, an object of the present invention is to provide a kind of equipment and method, can be to improve above-mentioned shortcoming at least.
According to the present invention, a kind of reading device that is used for electronic recognition system is provided, this reading device comprises a plurality of read heads, is used for the transponders that will read is encouraged; And provide and be used for the control device that the read head time division multiplexing drives.
This driving can be driven by the switching of read head to be undertaken multiplexed by the multistage ordered mode, this multistage ordered mode comprises the phase one that is used to drive first group of read head, at least another organizes another stage at least of described read head with being used to drive, add the phase one of subsequent cycle at least so that finish a complete cycle in the time period no longer than the transponders reset cycle, the reset cycle is to enter time period the normal manipulation mode again to transponders eliminating pumping signal from transponders.
Read head can be arranged in the array, such as a linear array or a rectangular array.
Read head in first group and the read head in another is organized at least can be arranged according to the relation that replaces, so that a radiation pattern relevant with the head that drives simultaneously can be not overlapping.
Reading device can be static, and in other embodiments, read head is to move past the container that comprises the transponders that will be read movably at least.
Pick-up device can comprise a central reader, and control device can comprise quick converting switch device, and for example PIN diode is used in the multistage order each read head being connected with central read head.When comprising a more than read head in one group, this group read head can connect by the power division apparatus.
In certain embodiments, can use a plurality of read head arrays, and in this class embodiment the adjacent read head Be Controlled in adjacent array so that they do not driven simultaneously.
Reading device also can comprise at least one exciting bank, and this exciting bank comprises at least one transmitter, is used to prevent that transponders from withdrawing from park mode and return to the normal manipulation mode of transponders.
In some such embodiment, the read head array can be positioned between leading (leading) excitation array and afterbody (trail) the excitation array.
The central shaft that at least some read heads can be arranged to the radiation pattern relevant with the read head ground horizontal expansion that is relative to each other.These axles can for example extend with being perpendicular to one another.
Each read head can comprise an antenna that is suitable for transmitt or receive signal, and the polarization of signal is not limited to a plane.
The present invention comprises that also one is used for the reading device of electronic recognition system, and this pick-up device comprises: a plurality of read heads, and each read head is relevant with radiation pattern, and wherein read head sends a pumping signal with the interrogation pulse transceiver; At least some readhead arrangement become the central shaft of each radiation pattern be relative to each other ground horizontal expansion.
The present invention comprises that also one is used for the reader device of electronic recognition system, comprises an antenna that is suitable for transmitt or receive signal, and the polarization of signal is not limited to a plane.
The present invention comprises that also one is used for the read head of electronic recognition system, and this read head comprises a plurality of exciting elements that are used for the transponders that will read is produced excitation; These elements are that the mode with time division multiplexing drives in the middle of using.
Exciting element can be first and second antenna elements, be used for transmission or reception respectively at the first and second plane polarized signals, and the driving of switching described element with the multistage ordered mode drives these elements, this multistage ordered mode comprises phase one that drives first element and the subordinate phase that drives second element, add the phase one of subsequent cycle at least so that finish a complete cycle in the time period no longer than the transponders reset cycle, the reset cycle is to enter time period the normal manipulation mode again to transponders eliminating pumping signal from transponders.
The present invention also comprises a kind of method that reads a plurality of transponders, comprises the step that a plurality of read elements are set; With drive these elements with the driving pulse transceiver in the time division multiplexing mode.
Each transponders can have by sending and will be read the operator scheme that data that device receives come the excitation to reader to respond; An and park mode, transponders promptly enters this pattern after receiving the data of having been confirmed by reader, and transponders remains on this pattern always, till from transponders, eliminating excitation, transponders also is suitable for being eliminated in excitation and enters operator scheme again after reaching a reset cycle, actuation step can comprise that the switching that read element carries out with the multistage ordered mode drives, this multistage ordered mode comprises that the phase one that drives first group of described read element, another organized another stage at least of described read element at least with driving, added the phase one of subsequent cycle at least so that finish a complete cycle in the time period no longer than the transponders reset cycle.
These elements can form the part of read head, and read head can remain static and can be arranged to the radiation pattern relevant with read head and compile and cover on the container that will read in an embodiment of the inventive method.
In another embodiment, method of the present invention also comprises the step that read head is moved past the container that will be read; With only with exciting bank not the transponders in the energy field relevant with read head remain on operator scheme so that make them not be subjected to influence by the scattared energy of read head generation, and/or the transponders that will be read remains on the step of park mode
Description of drawings
In an exemplary fashion the present invention is further detailed referring now to accompanying drawing, wherein:
Fig. 1 is the functional-block diagram of prior art recognition system;
Fig. 2 is the functional-block diagram that comprises the system of reading device according to of the present invention;
Fig. 3 is the block scheme that comprises the reading device of a read head array and its control device according to of the present invention;
Fig. 4 is the more detailed figure of array and switching control thereof;
Fig. 5 is the block scheme of another embodiment of read head array and its control device;
Fig. 6 is the figure of explanation read head structure in a plurality of linear arraies;
Fig. 7 is the figure of the read head structure in rectangular array;
Fig. 8 is the figure of explanation according to mobile read head of the present invention;
Fig. 9 is the figure of explanation another embodiment of reading device according to the present invention;
Figure 10 is the block scheme that comprises the read head of antenna according to of the present invention;
Figure 11 is the block scheme that is used for the another kind of antenna arrangement of read head;
Figure 12 is the block scheme according to another kind of read head of the present invention.
Embodiment
The recognition system of prior art is usually as 10 indications of the reference number among Fig. 1.
Be installed in the applicable cases that the transponders that will be identified on the object need be read a large amount of, may need the energy field of scanned object.This can pass through
AMobile reader 12 is realized on the direction.Because it is along the line from the energy that reader 12 sends
BWith
CScattering and reflection, the long-range transponders TRP in not on the scene 14
2Be energized, read and switch to park mode.But along with moving of field, the scattared energy of injecting will be from transponders TRP
2Middle elimination, transponders TRP
2Another switches in the normal manipulation mode.It can be read once more under this pattern.Energy field when reality is radiated transponders TRP later on more like this
2When last, this transponders will be read once more, causes the error of data read and record.
In Fig. 2, shown for improving the block scheme of the system 20 that the problems referred to above propose.This system comprises a pick-up device 22, and it comprises a plurality of being arranged in the array to cover a read head 22.1 to 22.4 that reads container 24 of separating.Reading container is the container that comprises the transponders that must accept identification record or identification checking procedure.Reading container can be determined by a framework 26, the transponders (not shown) can be installed on have similar characteristic object 28.1 to 28.n, object must be counted by said process.Each is relevant with each radiation pattern 23.1 to 23.4 that has central shaft 25.1 to 25.4 respectively that is generally taper.
This system also comprises the switch controlling device 29 that is connected with read head 22.1 to 22.4, be used for driving the time division multiplexing driving of carrying out read head with the multistage ordered mode by the switching of read head, this multistage ordered mode comprises that the phase one that only drives first group of described read head, another organized another stage at least of described read head at least with a driving, added the phase one of subsequent cycle at least so that finish a complete cycle in the time period no longer than the transponders reset cycle.
In the phase one, have only read head 22.1 and 22.3 to be driven simultaneously, and, have only read head 22.2 and 22.4 to be driven simultaneously in subordinate phase.In such a way, read head adjacent in the read head 22.1 to 22.4 does not switch simultaneously, thereby can improve the consequence of multiple signals and signal cancellation.
Second embodiment of reading device such as square frame number in the figure 30 indications of Fig. 3.This device 30 comprises that one is connected to the reader and the switch controller 32 of switch enclosure 36 by concentric cable 34.Signal that sends and the signal that will receive are propagated in described cable.Switching controls line 38 is connected between controller 32 and the box 36, and it sends switch-over control signal to box 36.Read head 38.1 is connected to box 36 by cable 39.1, and read head 38.2 is connected to box 36 by cable 39.2.In this bipitch structure, read head 38.1 and 38.2 alternately and is repeatedly driven in one-period in identification record and identification checking procedure, adds phase one of subsequent cycle thereby finish a complete cycle in a reset cycle.
Because require switch speed fast, used a kind of quick semiconductor switch to implement this drive pattern.40 indications among a kind of applicable circuit example such as Fig. 4.This circuit comprises a central reader 42 that is connected with 44.2 with read head 44.1.The controller 46 of one switch matrix form also links to each other with circuit.This circuit also comprises PIN diode 48.1 and 48.2, the retarder 50.1 and 50.2 and blocking capacitor 52.1 and 52.2 of high impedance is arranged under operating frequency, reaches reader 42 and current limliting and biasing resistor 54 to prevent switching voltage.
Signal at switch control input 46.1 places is a bifurcation binary signal.Switch matrix produces logic high and logic low signal, makes them at output terminal 46.2 and 46.3 alternately and repeat.The signal that occurs at output terminal 46.2 is opposite with the signal phase that occurs at output terminal 46.3.When output terminal 46.3 was high level, a high voltage was added on the diode 48.1, and the electric current diode switch of flowing through, and made its conducting, thereby made reader transmission signal to read head 44.1 with from read head 44.1 received signals.The electric current resistance 54 of also flowing through makes diode 48.2 reverse bias and read head 44.2 and reader 42 is isolated.When output terminal 46.2 became high level, diode 48.2 was by forward bias, so that reader transmission signal is to read head 44.2 with from read head 44.2 received signals, and makes diode 48.1 forward bias, read head 44.1 and reader 42 isolated.
Shown in the system 60 of Fig. 5, when four or more a plurality of read heads 62.1 to 62.4 are used for covering when reading container, read head 62.1 and 62.3 is driven simultaneously and is connected to switch element 64 by power divider 66.1, and the read head 62.2 that is driven simultaneously after read head 62.1 and 62.3 is driven and 62.4 is connected to switch element 64 by power divider 66.2.Switch element 64 links to each other with reader 68.
Reading device or pick-up device can be the forms of array, as linear array or rectangular array.These structures are shown in Fig. 6 and 7.When more than one of the array that uses (as shown in Figure 6), control is that the adjacent read head of adjacent array can not be driven simultaneously.In the device shown in Fig. 6 and 7, be designated as
ARead head switched simultaneously, indicate then
BRead head, indicate then
CRead head, indicate then
ARead head, all operations all are to finish being equal to or less than in the time period of above-mentioned reset cycle.
Adopt such device, the whole container that reads is covered by static read head.Because adjacent read head is not driven simultaneously, the consequence of multiple signals and signal cancellation has been alleviated.And in the period 1 of identifying, the transponders that has read encourages on the reset cycle intercycle ground at them in each cycle in checking procedure again, prevents that thus them from switching to normal manipulation mode and read for the second time from park mode.In check-verifying period, have only the transponders that is not read in cycle in front just to be read.When checking procedure finished, all transponders should be read, thereby should obtain equaling the sum of transponders number to obtain the sum of object in the container.
System as shown in Figure 8 according to another embodiment of the present invention.In this embodiment, one movably reading device 70 comprise a reader array 72, this array comprises read head
AWith
B, and array is surrounded by a leading excitation array 74 and an afterbody excitation array 76.This assembly can read the container (not shown) in direction C upper edge and move.Reader array 72 is driven according to above-mentioned principle, that is: the reader in the array is driven in the reset cycle in proper order, and adjacent reader does not drive simultaneously; When reading a transponders, this transponders is identified and is switched to park mode.Encourage array neither to read transponders on the other hand and also do not acknowledge receipt of cognizance code (thus transponders being switched to park mode), but the transponders that will be read remains on park mode.This structure also can improve the scattering of the transponders that is shone by the scattering pumping signal and read with accidental two kinds.
The present invention also has an embodiment to be shown in Fig. 9.In this embodiment, the read head 90.1 to 90.3 of device is arranged to central shaft 92.1 to 92.3 horizontal expansions relative to one another of their radiation pattern, preferably substantially with orthogonally by reading container 94.Read head preferably drives with foregoing ordered mode, and can send with identical or different frequency, all is energized and reads with the transponders that guarantees arbitrary orientation.Drive the device of read head when also can provide bigger.
The present invention also comprises a kind of read head, and it comprises that a suitable polarised direction that sends is not limited to the interrogating signal on a plane and receives the antenna assembly that polarised direction is not limited to the response signal on a plane.
In first embodiment shown in Figure 10, the antenna element 100 of read head 102 is spiral helicine, so that send the circular polarization signal
E, read head 104 comprises that also one is used to control transmitter 108 generation pumping signals
EController 106, be used to receive the receiver 110 of backscatter modulation signal, and the route device 112 that is used for transmitter 108 or receiver 110 are connected to antenna element 100.
Use this antenna element 100, the transponders (not shown) and towards with the arbitrary orientation of the directional correlation of antenna element 100 on antenna (not shown equally) can receive pumping signal
E And antenna element 100 also can receive the backscatter modulation signal of polarization randomly from transponders.
In another embodiment shown in Figure 11, the linear antenna element 120 of two quadratures is connected with 126 with feed lines 124 respectively at their feeding points separately with 122.Be provided with adjustable delay line element 128 and 130 respectively in feed lines 124 and 126.Feed lines 124 is connected with transmitter 132 with 126.By using controller (not shown) control lag circuit element, the phase place of the signal of propagating in circuit 124 and 126 can be regulated with being relative to each other, causes sending pumping signal
FNonlinear polarization.
The signal of nonlinear polarization
FShould receive by the transponders (not shown) antenna (also not shown) on the arbitrary orientation relevant with antenna element 120 and 122.
Figure 12 illustrates another embodiment according to read head of the present invention.Read head 140 comprises an antenna assembly 142, and this antenna assembly 142 comprises the antenna element 144 and 146 of vertical respectively and horizontal polarization.Element 144 is connected with switch enclosure 152 with 150 by cable 148 respectively with 146.Switch enclosure is connected with transceiver 154.
Switch enclosure is used for transceiver 154 and element 144 repeatedly with alternately are connected with 146, and its speed is for finishing first stage that one-period adds subsequent cycle in reset cycle of the transponders that will read or shorter time.
Being to be understood that for transponders according to the present invention has many details to change, and can not break away from the spirit and scope of claims.
Claims (14)
1. method that is used for electronic recognition system, this electronic recognition system has a reading device, and this reading device comprises a plurality of read heads that are used for the transponders that will read is produced excitation; With the control device that is used for described read head time division multiplexing driving, described method comprises step:
Switch the described read head of driving with multistage sequential system time division multiplexing, wherein said multistage ordered mode comprises the phase one that is used to drive first group of read head, at least another organizes another stage at least of described read head with being used to drive, add the phase one of subsequent cycle at least so that finish a complete cycle in the time period no longer than the described transponders reset cycle, the described reset cycle is to enter time period the normal manipulation mode again to transponders eliminating pumping signal from described transponders.
2. described method as claimed in claim 1, wherein said read head keep static and are arranged in the radiation pattern relevant with described read head being compiled cover on the container that comprises the transponders that is read.
3. described method as claimed in claim 1 may further comprise the steps: read head is moved past the container that will be read; Transponders in the energy field relevant with described read head remains on operator scheme with inciting somebody to action not with other exciting bank.
4. reading device that is used for electronic recognition system, described electronic recognition system comprises a plurality of transponders, and wherein each transponders has the operator scheme that will be come the excitation to described reading device to respond by the data that described reading device receives by sending; And a park mode, described transponders promptly enters this pattern after receiving the data of having been confirmed by described reading device, and described transponders remains on this pattern always, up to eliminate described excitation from transponders till; Described transponders is suitable for being eliminated the time in described excitation and enters operator scheme again after reaching a reset cycle, described reading device comprises: a plurality of read heads, with the control device that is used for driving described read head with multistage ordered mode time division multiplexing, this multistage ordered mode comprises that the phase one that drives first group of described read head, another organized another stage at least of described read head at least with driving, added the phase one of subsequent cycle at least so that finish a complete cycle in the time period no longer than the transponders reset cycle.
5. reading device as claimed in claim 4 is characterized in that described read head is arranged to an array.
6. reading device as claimed in claim 5 comprises a plurality of read head arrays, but the choice phase that described controller also is provided in the one-period drives read head on any one side of adjacent array.
7. reading device as claimed in claim 4 is characterized in that described read head in described first group and the described read head in described another group at least are provided with relation alternately.
8. as described reading device one of in the claim 4 to 7, it is characterized in that it is static.
9. as described reading device one of in the claim 4 to 7, it is characterized in that described at least read head is to move past the container that the transponders that will be read is housed movably.
10. as described reading device one of in the claim 4 to 9, it is characterized in that it can comprise a central reader, and described control device can comprise apparatus for fast switching, is used for each read head is connected with described central reader.
11., it is characterized in that it also comprises the exciting bank that at least one is additional as described reading device one of in the claim 4 to 9, be used for the paired pulses transceiver and produce excitation, return to the normal manipulation mode of described transponders to prevent them.
12., it is characterized in that the ground horizontal expansion that is relative to each other of central shaft that at least some read heads can be arranged to the radiation pattern relevant with read head as described reading device one of in the claim 4 to 9.
13. reading device as claimed in claim 12 is characterized in that described axle can be to extend basically with being perpendicular to one another.
14. as described reading device one of in the claim 4 to 13, it is characterized in that described each read head can comprise an antenna that is suitable for transmitt or receive signal, the polarization of signal is not limited to a plane.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA977742 | 1997-08-28 | ||
| ZA97/7742 | 1997-08-28 | ||
| ZA98/2024 | 1998-03-10 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100457653A Division CN1737813A (en) | 1997-08-28 | 1998-08-28 | Reader arrangement for an electronic identification system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1991858A true CN1991858A (en) | 2007-07-04 |
Family
ID=36080604
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100457653A Pending CN1737813A (en) | 1997-08-28 | 1998-08-28 | Reader arrangement for an electronic identification system |
| CNA2006100958849A Pending CN1991858A (en) | 1997-08-28 | 1998-08-28 | Reader arrangement for an electronic identification system |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100457653A Pending CN1737813A (en) | 1997-08-28 | 1998-08-28 | Reader arrangement for an electronic identification system |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN1737813A (en) |
-
1998
- 1998-08-28 CN CNA2004100457653A patent/CN1737813A/en active Pending
- 1998-08-28 CN CNA2006100958849A patent/CN1991858A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN1737813A (en) | 2006-02-22 |
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