CN102750569B - RFID label tag, rfid system and the illumination detection method of a kind of band light-sensitive unit - Google Patents
RFID label tag, rfid system and the illumination detection method of a kind of band light-sensitive unit Download PDFInfo
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- CN102750569B CN102750569B CN201210179497.9A CN201210179497A CN102750569B CN 102750569 B CN102750569 B CN 102750569B CN 201210179497 A CN201210179497 A CN 201210179497A CN 102750569 B CN102750569 B CN 102750569B
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Abstract
The present invention provides RFID label tag, rfid system and the illumination detection method of a kind of band light-sensitive unit, described light-sensitive unit forms parallel-connection structure with the antenna of described RFID label tag, the circuit that described light-sensitive unit is connected with the chip of RFID label tag has a logic circuit controlling break-make, the circuit of this connection and the part that the logic circuit controlling break-make is chip, when logic circuit disconnects, light-sensitive unit not with sky line parallel, now being placed under certain intensity of illumination, the first resonant frequency of antenna and signal intensity keep constant；When logic circuit is connected, light-sensitive unit and sky line parallel, now it is placed under certain intensity of illumination, now Antenna Operation is under the second resonant frequency；The instruction that described RFID tag RFID reader sends is with the break-make of control logic circuit, thus realizes by comparing the change detecting illumination from the difference between the signal intensity of the different frequency of antenna.The present invention can detect illumination variation at lower cost.
Description
Technical field
The present invention relates to RFID(Radio Frequency Identification, RF identification) technical field, particularly relate to one
Plant the RFID label tag of band light-sensitive unit, rfid system and illumination detection method.
Background technology
In recent years, rfid system had become more prevalent.Rfid system is mainly used in the identification to people and thing.General next
Saying, this system includes at least a RFID reader, and this RFID reader can be sent out in the range of a setting
Penetrate and accept the radiofrequency signal from one or more RFID label tag.This RFID label tag is usually encapsulated, can
With patch on one object, it includes that one can carry out the microchip of communication for information with antenna.This microchip is in general
One integrated circuit, it can be used to store and process information, modulation /demodulation radiofrequency signal, and can run other spy
Distinguished service energy.The antenna of RFID label tag is used to receive and send radiofrequency signal, and is commonly available to a kind of special frequency.
In some equipment, the rfid system with light-sensitive unit has been used for monitoring the intensity of illumination of product local environment
When exceed acceptable intensity of illumination.In general these equipment requirements induction installations to have a lasting energy
Source, is used for detecting the change of illumination, but this can increase the cost of equipment.It addition, some equipment requirements induction installations are also wanted
Being connected with a comparator circuit, thus detect the degree size of deviation reference voltage, this requirement considerably increases and sets
Standby cost.In a word, improving what rfid system was a need for, it requires do not using lasting energy source or use
Can be used to detect illumination variation during the adjunct circuit of a kind of low cost.
Summary of the invention
The embodiment of the present invention provides RFID label tag, rfid system and the illumination detection method of a kind of band light-sensitive unit, with relatively low
Become originally to detect illumination variation.
On the one hand, the RFID label tag of a kind of band light-sensitive unit, the chip of described RFID label tag are embodiments provided
On have two pins；Described light-sensitive unit is connected with the two pin, and forms knot in parallel with the antenna of described RFID label tag
Structure, the change of ambient light photograph can cause the change of the resistance of light-sensitive unit own, at the core of described light-sensitive unit Yu RFID label tag
Having a logic circuit controlling break-make on the circuit that sheet connects, the circuit of this connection is chip with the logic circuit of control break-make
A part, whether the break-make of logic circuit determines light-sensitive unit with sky line parallel: when logic circuit disconnects, photosensitive dress
Put not with sky line parallel, be now placed under certain intensity of illumination, the first resonant frequency of antenna and signal intensity keep
Constant；When logic circuit is connected, light-sensitive unit and sky line parallel, now it is placed under certain intensity of illumination, antenna
Characteristic frequency and signal intensity at least have one and change, now Antenna Operation is under the second resonant frequency；Described
The instruction that RFID tag RFID reader sends is with the break-make of control logic circuit, thus realizes by comparing from sky
Difference between the signal intensity of the different frequency of line detects the change of illumination.
Optionally, in an embodiment of the present invention, the antenna of described RFID label tag is monopole antenna.
Optionally, in an embodiment of the present invention, the antenna of described RFID label tag is double-doublet antenna: described light-sensitive unit
Parallel-connection structure is formed with wherein antenna；Or described light-sensitive unit and two antennas concurrently form parallel-connection structure.
Optionally, in an embodiment of the present invention, described light-sensitive unit is resistor-type light-sensitive unit, the photosensitive dress of described resistor-type
Put and include: cadmium sulphide photoconductive cell device, cadmium slenide photoconductive cell device and other types photoconductive resistance device.
On the other hand, the RFID label tag of a kind of band light-sensitive unit, the core of described RFID label tag are embodiments provided
A pin is had on sheet；One end of described light-sensitive unit is connected with this pin, and the other end is connected to described RFID label tag
On antenna, and forming parallel-connection structure with antenna, the change of ambient light photograph can cause the change of the resistance of light-sensitive unit own, in institute
State and on the circuit that light-sensitive unit is connected with the chip of RFID label tag, have a logic circuit controlling break-make, the circuit of this connection
Being a part for chip with the logic circuit controlling break-make, the break-make of logic circuit determines light-sensitive unit with antenna the most also
Connection: when logic circuit disconnects, light-sensitive unit not with sky line parallel, be now placed under certain intensity of illumination, antenna
The first resonant frequency and signal intensity keep constant；When logic circuit is connected, light-sensitive unit and sky line parallel, now by
Being placed under certain intensity of illumination, the characteristic frequency of antenna and signal intensity at least have one and change, now antenna
It is operated under the second resonant frequency；The instruction that described RFID tag RFID reader sends is with control logic circuit
Break-make, thus realize by comparing the change detecting illumination from the difference between the signal intensity of the different frequency of antenna.
Optionally, in an embodiment of the present invention, the antenna of described RFID label tag is monopole antenna.
Optionally, in an embodiment of the present invention, the antenna of described RFID label tag is double-doublet antenna: described light-sensitive unit
Parallel-connection structure is formed with wherein antenna；Or described light-sensitive unit and two antennas concurrently form parallel-connection structure.
Optionally, in an embodiment of the present invention, described light-sensitive unit is resistor-type light-sensitive unit, the photosensitive dress of described resistor-type
Put and include: cadmium sulphide photoconductive cell device, cadmium slenide photoconductive cell device and other types photoconductive resistance device.
Another aspect, embodiments provides the RFID label tag of a kind of band light-sensitive unit, and described light-sensitive unit is connected to
On the antenna of described RFID label tag, and forming parallel-connection structure with antenna, the change of ambient light photograph can cause light-sensitive unit itself
The change of resistance, has a logic circuit controlling break-make with antenna on the circuit that described light-sensitive unit is connected, this connection
Circuit is the part of chip with the logic circuit controlling break-make, the break-make of logic circuit determine light-sensitive unit whether with antenna
In parallel: when logic circuit disconnects, light-sensitive unit not with sky line parallel, be now placed under certain intensity of illumination, sky
First resonant frequency of line and signal intensity keep constant；When logic circuit is connected, light-sensitive unit and sky line parallel, now
Being placed under certain intensity of illumination, the characteristic frequency of antenna and signal intensity at least have one and change, now sky
Line is operated under the second resonant frequency；The instruction that described RFID tag RFID reader sends is with control logic circuit
Break-make, thus realize detecting changing of illumination from the difference between the signal intensity of the different frequency of antenna by comparing
Become.
Optionally, in an embodiment of the present invention, the antenna of described RFID label tag is monopole antenna.
Optionally, in an embodiment of the present invention, the antenna of described RFID label tag is double-doublet antenna: described light-sensitive unit
Parallel-connection structure is formed with wherein antenna；Or described light-sensitive unit and two antennas concurrently form parallel-connection structure.
Optionally, in an embodiment of the present invention, described light-sensitive unit is resistor-type light-sensitive unit, the photosensitive dress of described resistor-type
Put and include: cadmium sulphide photoconductive cell device, cadmium slenide photoconductive cell device and other types photoconductive resistance device.
Another further aspect, embodiments provides the rfid system of a kind of band light-sensitive unit, and described rfid system includes
RFID label tag and RFID reader, described RFID label tag includes the RFID label tag of above-mentioned band light-sensitive unit；Described RFID
Reader sends the instruction break-make with the logic circuit of control RFID label tag, thus by comparing the different frequency from antenna
Signal intensity between difference detect the change of illumination.
Another further aspect, embodiments provides the illumination detection method of the rfid system of a kind of band light-sensitive unit, described
Illumination detection method is applied to the rfid system of above-mentioned band light-sensitive unit, including: sent by described RFID reader and refer to
Order is to control the break-make of the logic circuit of RFID label tag；The instruction sent by RFID tag RFID reader is with control
The break-make of logic circuit processed: when logic circuit disconnects, light-sensitive unit not with sky line parallel, be now placed on certain
Under intensity of illumination, the first resonant frequency of antenna and signal intensity keep constant；When logic circuit is connected, light-sensitive unit with
It line parallel, is now placed under certain intensity of illumination, and the characteristic frequency of antenna and signal intensity at least have one
Changing, now Antenna Operation is under the second resonant frequency；Described RFID reader is utilized to compare the difference from antenna
Difference between the signal intensity of frequency detects the change of illumination.
Technique scheme has the advantages that because using the dwi hastasana of described light-sensitive unit and described RFID label tag
Become parallel-connection structure, the circuit that described light-sensitive unit is connected with the chip of RFID label tag has a logic electricity controlling break-make
Road, the circuit of this connection and the part that the logic circuit controlling break-make is chip: when logic circuit disconnects, photosensitive dress
Put not with sky line parallel, be now placed under certain intensity of illumination, the first resonant frequency of antenna and signal intensity keep
Constant；When logic circuit is connected, light-sensitive unit and sky line parallel, now it is placed under certain intensity of illumination, now
Antenna Operation is under the second resonant frequency；The instruction that described RFID tag RFID reader sends is to control logic electricity
The break-make on road, thus realization detects changing of illumination by comparing from the difference between the signal intensity of the different frequency of antenna
The technological means become, so having reached to detect at lower cost the technique effect of illumination variation, and utilizes RFID to obtain
Energy, solves the powerup issue of illumination detection.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing skill
In art description, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to root
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram that embodiment of the present invention light-sensitive unit is connected with RFID label chip；
Fig. 2 is the equivalent circuit diagram of RFID label chip inside antenna；
Fig. 3 is that embodiment of the present invention light-sensitive unit, logic switch are connected with RFID label chip inside antenna equivalent circuit
Schematic diagram；
Fig. 4 is that embodiment of the present invention light-sensitive unit is joined directly together, with RFID label antenna, the schematic diagram connect；
Fig. 5 .1-Fig. 5 .2 is the structure explanatory diagram of embodiment of the present invention light-sensitive unit；
Fig. 6 is the flow chart of embodiment of the present invention illumination level based on signal intensity detection method.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under not making creative work premise
Execute example, broadly fall into the scope of protection of the invention.
The light-sensitive unit of the embodiment of the present invention is connected with the chip of RFID label tag and at least there are three kinds of situations:
Two pins structure:
The embodiment of the present invention is a kind of for detecting the device of illumination variation, system and technology.This system contains one
RFID label tag, the chip of this RFID label tag has two pins.Light-sensitive unit is connected with the two pin, with dwi hastasana
Become parallel-connection structure.The change of ambient light photograph can cause the change of the resistance of light-sensitive unit own.At the circuit that pin is connected with chip
On have a logic circuit controlling break-make, the circuit of this connection is the part of chip with the logic circuit controlling break-make.Patrol
The break-make of volume circuit determine light-sensitive unit whether with sky line parallel.
When logic circuit disconnects, light-sensitive unit not with sky line parallel, be now placed under certain intensity of illumination, antenna
The first resonant frequency and signal intensity keep constant.When logic circuit is connected, light-sensitive unit and sky line parallel, now by
Being placed under certain intensity of illumination, the characteristic frequency of antenna and signal intensity at least have one and change, now antenna
It is operated under the second resonant frequency.RFID reader can send the break-make of instruction control logic circuit to label, in logic
During circuit ON, changing of illumination can be detected by comparing from the difference between the signal intensity of the different frequency of antenna
Become.
For an example, this system contains a RFID label tag, an only antenna on this label.This
Two pins are had on the chip of label.Light-sensitive unit is connected with the two pin, forms parallel-connection structure with this root antenna.Drawing
A logic circuit controlling break-make is had with chip, the circuit of this connection and the logic electricity of control break-make on the circuit that foot is connected
Road is a part for chip.The change of ambient light photograph can cause the change of the resistance of light-sensitive unit own.
Being placed on when logic circuit is connected under certain intensity of illumination, characteristic frequency and the signal intensity of antenna at least have
One changes, and now Antenna Operation is under the second resonant frequency.RFID reader can send instruction to label, and
The change of illumination can be detected by the difference between the signal intensity of different frequency during CL Compare Logic connecting and disconnecting of the circuit.More precisely
Ground is said, light-sensitive unit should have relatively low resistance, and its instantiation includes: cadmium sulphide photoconductive cell device, cadmium selenide light
Quick resistance device and other types photoconductive resistance device etc..
For another example, this system contains a RFID label tag, and this label has two antennas.Now
There are two kinds of situations.The first situation is that light-sensitive unit is connected with the two pin, forms parallel-connection structure with first antenna.?
A logic circuit controlling break-make is had with chip, the circuit of this connection and the logic of control break-make on the circuit that pin is connected
Circuit is a part for chip.The change of ambient light photograph can cause the change of the resistance of light-sensitive unit own.And second antenna begins
Eventually with the first resonant frequency proper communication.
When logic circuit is connected, it is placed under certain intensity of illumination, the characteristic frequency of first antenna and signal intensity
At least a meeting changes, and it is operated under the second resonant frequency.RFID reader can send instruction to label,
And by CL Compare Logic circuit ON time first and second antennas different frequency signal intensity between difference can examine
The change of light-metering photograph.Between signal intensity by the different frequency during logic circuit break-make that compares second antenna self
Difference can also detect the change of illumination.
The second situation is, light-sensitive unit is connected with the two pin, concurrently forms parallel-connection structure with two antennas.At pin
A logic circuit controlling break-make is had, the circuit of this connection and the logic circuit of control break-make on the circuit being connected with chip
It it is a part for chip.The change of extraneous intensity of illumination can cause the change of the resistance of light-sensitive unit own.This only contains one with label
The situation of root antenna is similar to.It is placed on when logic circuit is connected under certain intensity of illumination, antenna features frequency and signal
Intensity at least has one and changes, and it is operated under the second resonant frequency.RFID reader can send to label and refer to
Order, and the change of illumination can be detected by the difference between the signal intensity of different frequency during CL Compare Logic connecting and disconnecting of the circuit.
The first situation circuit connects fairly simple, and during work, the resonant frequency of two antennas may be different, can affect the precision of measurement.
The second situation circuit connects more complicated, but during work, the resonant frequency of two antennas is consistent, and certainty of measurement is higher.More true
Saying with cutting, light-sensitive unit should have relatively low resistance, and its instantiation includes: cadmium sulphide photoconductive cell device, cadmium selenide
Photoconductive resistance device and other types photoconductive resistance device etc..
One pin configuration:
The chip of this label can only have a pin, and this pin is outwards connected with one end of light-sensitive unit, light-sensitive unit
The other end be attached directly on antenna.Pin is similar at the junction point of chip internal and the situation of two pins, finally remains
Reach and the purpose of sky line parallel.There is one to control patrolling of break-make on the circuit that pin is connected with chip internal circuits simultaneously
Collect circuit.When logic circuit disconnects, light-sensitive unit not with sky line parallel, be now placed under certain intensity of illumination,
First resonant frequency of antenna and signal intensity keep constant.
When logic circuit is connected, light-sensitive unit and sky line parallel, now it is placed under certain intensity of illumination, antenna is special
Levying frequency and signal intensity at least has one and changes, it is operated under the second resonant frequency.RFID reader can
The break-make of instruction control logic circuit is sent to label, when logic circuit is connected, can be by comparing the difference from antenna
Difference between the signal intensity of frequency detects the change of illumination.
For an example, this system contains a RFID label tag, an only antenna on this label.This
A pin is had on the chip of label.Light-sensitive unit is connected with this pin, and the light-sensitive unit other end is attached directly on antenna,
Parallel-connection structure is formed with antenna.The circuit that pin is connected with chip has a logic circuit controlling break-make, this connection
The logic circuit of circuit and control break-make is a part for chip.The change of extraneous intensity of illumination can cause light-sensitive unit itself
The change of resistance.Be placed on when logic circuit is connected under certain intensity of illumination, Antenna Operation under the second resonant frequency,
Its characteristic frequency and signal intensity at least have one and change.RFID reader can send instruction to label, and leads to
Difference between the signal intensity of different frequency when crossing CL Compare Logic connecting and disconnecting of the circuit can detect the change of intensity of illumination.More true
Saying with cutting, light-sensitive unit should have relatively low resistance, and its instantiation includes: cadmium sulphide photoconductive cell device, cadmium selenide
Photoconductive resistance device and other types photoconductive resistance device etc..
For another example, this system contains a RFID label tag, and this label has two antennas.This
A pin is had on the chip of label.Light-sensitive unit is connected with this pin, and the light-sensitive unit other end is attached directly on antenna,
Parallel-connection structure is formed with first antenna.The circuit that pin is connected with chip has a logic circuit controlling break-make, should
The circuit connected and the logic circuit controlling break-make are parts for chip.The change of ambient light photograph can cause light-sensitive unit originally
The change of body resistance.And second antenna is all the time with the first resonant frequency communication.
When logic circuit is connected, be placed under certain intensity of illumination, first Antenna Operation under the second resonant frequency,
At least meeting of its characteristic frequency and signal intensity changes.RFID reader can send instruction to label, and leads to
When crossing CL Compare Logic circuit ON, the difference between the signal intensity of the different frequency of first and second antennas can detect light
According to change.By the difference between the signal intensity of the different frequency during logic circuit break-make that compares first antenna self
The change of illumination can also be detected.More precisely, light-sensitive unit should have relatively low resistance, its instantiation includes:
Cadmium sulphide photoconductive cell device, cadmium slenide photoconductive cell device and other types photoconductive resistance device etc..
Without pin configuration:
When not having pin on the chip of RFID label tag, light-sensitive unit can be attached directly on antenna.In this case, with
The antenna that light-sensitive unit is connected can not depart from light-sensitive unit and with normal frequency for communication.When being placed on certain intensity of illumination
Under, the characteristic frequency of antenna and signal intensity at least have one and change.RFID reader can be sent out to label apparatus
Send instruction, by comparing the change detecting intensity of illumination from the difference between the signal intensity of the different frequency of antenna.
For an example, this system contains a RFID label tag, and this label has two antennas.Photosensitive dress
Put and be directly connected with first antenna, and second antenna is not connected with light-sensitive unit all the time with the first positive normal open of resonant frequency
Letter.When being placed under certain intensity of illumination, first Antenna Operation under the second resonant frequency, its characteristic frequency and letter
A number intensity at least meeting changes, and the characteristic frequency of second antenna and signal intensity are constant.RFID reader
Instruction can be sent to label, and can by comparing the difference between the signal intensity of the different frequency of first and second antennas
To detect the change of illumination.More precisely, light-sensitive unit should have relatively low resistance, its instantiation includes: sulfuration
Cadmium photoconductive resistance device, cadmium slenide photoconductive cell device and other types photoconductive resistance device etc..
In the same way, the chip of antenna can also can carry one can also carry multiple pin without pin by band.My god
The radical of line can be one, two the most.One or more light-sensitive unit can also be connected accordingly, simultaneously
The model of light-sensitive unit can be the same or different.For a kind of instantiation of device, when being placed on certain light
According under intensity, at least meeting of the characteristic frequency of the antenna being connected with light-sensitive unit and signal intensity changes.RFID
Reader can send instruction to label apparatus, comes from the difference between the signal intensity of the different frequency of antenna by comparing
The change of detection illumination.
For the instantiation of a kind of light-sensitive unit, simultaneous compares the method for numerical value and includes these compare numerical value and majority
Signal strength values compares.These signal strength values belong to different frequencies, and are associated, simultaneously with most illumination values
The intensity of illumination can be detected based on comparison mentioned above.
But, for another aspect, a rfid system includes that a RFID label tag device and a RFID read
Device device.This RFID label tag device is used to send two kinds of signals, signal when the most above-mentioned logic circuit disconnects and logic
Signal during circuit ON, the request being subject to is responded by a kind of meeting of both signals.RFID reader device
It is used for RFID label tag device is at least sent a request.Installing reading device is to accept the logic circuit from label
The fiducial value between signal strength values when signal strength values during connection and logic circuit disconnect, and these fiducial values are converted
Varying level for illumination.
In an example, the antenna of RFID label tag is connected with light-sensitive unit, has one to control logical on this connection line
Disconnected logic circuit.In the case of logic circuit break-make whether two kinds, have corresponding two kinds of different frequencies from antenna
Rate.When logic circuit is connected and this label apparatus is positioned under certain intensity of illumination, due to the change of resonant frequency,
The intensity level of unlike signal will be produced.
In an example, RFID label tag device includes first, second two antennas.Preferably, first sky
Line is connected with light-sensitive unit, under this label apparatus is placed on certain intensity of illumination, due to the change of resonant frequency,
The difference of signal strength values under the second resonant frequency will be produced.
Another further aspect, embodiments provides the rfid system of a kind of band light-sensitive unit, and described rfid system includes
RFID label tag and RFID reader, described RFID label tag includes the RFID label tag of above-mentioned band light-sensitive unit；Described RFID
Reader sends the instruction break-make with the logic circuit of control RFID label tag, thus by comparing the different frequency from antenna
Signal intensity between difference detect the change of illumination.
Another further aspect, embodiments provides the illumination detection method of the rfid system of a kind of band light-sensitive unit, described
Illumination detection method is applied to the rfid system of above-mentioned band light-sensitive unit, including: sent by described RFID reader and refer to
Order is to control the break-make of the logic circuit of RFID label tag；The instruction sent by RFID tag RFID reader is with control
The break-make of logic circuit processed: when logic circuit disconnects, light-sensitive unit not with sky line parallel, be now placed on certain
Under intensity of illumination, the first resonant frequency of antenna and signal intensity keep constant；When logic circuit is connected, light-sensitive unit with
It line parallel, is now placed under certain intensity of illumination, and the characteristic frequency of antenna and signal intensity at least have one
Changing, now Antenna Operation is under the second resonant frequency；Described RFID reader is utilized to compare the difference from antenna
Difference between the signal intensity of frequency detects the change of illumination.
As it is shown in figure 1, the signal of the light sensitive tag 10 being connected with RFID label chip for embodiment of the present invention light-sensitive unit
Figure.In Fig. 1, label apparatus 10, including a base 15, a surface-mounted integrated circuit 13, two pins 16,17 and
Individual double-doublet antenna 11,12.Having two pins 16,17 on surface-mounted integrated circuit 13, the two pin is outwards and light-sensitive unit
14 are connected, and the two pin is in parallel with the equivalent circuit of antenna at chip internal, and have one to control logical on the circuit connected
Disconnected logic circuit.Can control whether photosensitive module is access in chip circuit by the break-make of logic circuit, such that it is able to
The frequency of the antenna that impact is connected with radio-frequency module.When logic circuit disconnects, label antenna is with the first resonant frequency communication.
When logic circuit is connected, being placed under certain intensity of illumination, Antenna Operation is under the second resonant frequency, and its feature is frequently
Rate and signal intensity at least have one and change.
In an example, transmitting terminal 11,12 are made up of one or more different low electrical resistant materials, and these materials have higher
Electric conductivity, such as copper, silver, and aluminum, they and light-sensitive unit mentioned above are by two pins 16,17 and antenna
11,12 are connected, and when antenna 11,12 are placed under certain intensity of illumination, and light-sensitive unit can cause one or more
Penetrate end and the change of resonant frequency occurs.The frequency of this change is the most different with the frequency of reception and transmission.Such as, photosensitive dress
It is placed under certain intensity of illumination, may result in transmission frequency and accept in frequency that at least one changes.
In another example, the antenna frequencies value set at the beginning will be above the antenna frequencies under certain photoenvironment, then
When reaching certain illumination, it will reduce.In another example, the antenna frequencies set at the beginning is less than certain light
According to the antenna frequencies under level, when reaching certain illumination level, it will rise.Can be used for the such photosensitive of the present invention
Device has: cadmium sulphide photoconductive cell device, cadmium slenide photoconductive cell device and other types photoconductive resistance device etc..
Type based on light-sensitive unit is different, causes the illumination level of change to be probably a specific illumination value and is also likely to be one
The scope of individual selectively illumination value.The length of time necessarily causes the change of antenna resonance frequency, and antenna quality also can be led
Cause different changes.Such as, on antenna with the type of light-sensitive unit can affect change antenna resonance frequency required time
Length.
As in figure 2 it is shown, be the equivalent circuit diagram of RFID label antenna.When tag coil antenna enters the friendship that read write line produces
In varying magnetic field, the interaction between label antenna and reading and writing device antenna is similar to transformator.Both coils are equivalent to become
The primary coil of depressor and secondary coil.The resonant tank formed by label antenna is as in figure 2 it is shown, include the line of label antenna
Circle inductance (L), parasitic capacitance (Cp) and shunt capacitance (C2), its resonant frequency is
In formula, C is Cp
And C2Parallel equivalent electric capacity, R1, R2For circuit internal inductance coil and the equivalent resistance of other devices.Label and read write line
The carrier frequency that two-way communication uses is exactly f.When requiring that tag antenna coil profile is the least, i.e. area is little, and needs certain
Operating distance, the aerial coil mutual induction amount that RFID label tag and read write line are asked the most substantially can not meet actual demand, can be at mark
Signing the internal insertion of aerial coil and have the Ferrite Material of high permeability, to increase mutual induction amount, thus bucking coil cross section is little
Problem.
As it is shown on figure 3, be embodiment of the present invention light-sensitive unit, the logic circuit controlling break-make and RFID label antenna equivalence
The schematic diagram that circuit is connected.The resonant tank that formed by label antenna as it can be seen, include the coil inductance (L) of label antenna,
Parasitic capacitance (Cp) and shunt capacitance (C2), its resonant frequency is
Formula C is CpAnd C2Parallel connection
Equivalent capacity, R1, R2For circuit internal inductance coil and the equivalent resistance of other devices.M be represent light-sensitive unit can power transformation
Resistance, S is the logic circuit controlling break-make.When logic circuit disconnects, light-sensitive unit not with sky line parallel, be now placed
Under certain intensity of illumination, the first resonant frequency of antenna and signal intensity keep constant.When logic circuit is connected, light
Quick device and sky line parallel, be now placed under certain intensity of illumination, and Antenna Operation is under the second resonant frequency, and it is special
Levy frequency and signal intensity at least has one and changes.
As shown in Figure 4, the sketch of the passive RFID tags device 40 of illumination variation can be detected for the embodiment of the present invention.Such as figure
Shown in 4, label apparatus 40 includes a base 45, an integrated circuit 43 and a double-doublet antenna 41,42.With sky
The light-sensitive unit 44 that line 42 is connected will affect the resistance of antenna 42.The material that light-sensitive unit 44 is suitable for can be according to sky
Line 41, the current voltage of any in 42 controls any one frequency both pinpointed.For an example, peace
Dress antenna 41,42 can make it produce resonance in identical frequency.For another example, installing antenna 41,42 can
So that it produces resonance in different frequencies.
In an example, transmitting terminal double-doublet antenna 41,42 is made up of one or more different low electrical resistant materials, this
A little materials have higher electric conductivity, such as copper, silver, and aluminum, and they are connected with light-sensitive unit mentioned above, when antenna 41,
42 are placed under certain intensity of illumination, and light-sensitive unit can cause the change of one or more transmitting terminal generation resonant frequency,
Thus cause a different frequency.The change of this frequency is the most different with the frequency received and send.Such as, photosensitive dress
It is placed under certain intensity of illumination, may result in transmission frequency and accept in frequency that at least one changes.
In another example, the antenna frequencies value set at the beginning will be above the antenna frequencies under certain photoenvironment, then
When reaching certain illumination, it will reduce.In another example, the antenna frequencies set at the beginning is less than certain light
According to the antenna frequencies under level, when reaching certain illumination level, it will rise.Can be used for such light of this invention
Quick device has: cadmium sulphide photoconductive cell device, cadmium slenide photoconductive cell device and other types photoconductive resistance device etc..
Type based on light-sensitive unit is different, causes the illumination level of change to be probably a specific illumination value and is also likely to be one
The scope of individual selectively illumination value.The length of time necessarily causes the change of antenna resonance frequency, and antenna quality also can be led
Cause different changes.Such as, on antenna with the type of light-sensitive unit can affect change antenna resonance frequency required time
Length.
As shown in Fig. 5 .1, this device includes that two electrodes are respectively 511,512 and one photosensitive semiconductor thin layers 513.
The action principle of photoconductive resistance is based on photoconductive effect, it have highly sensitive, volume is little, quality is little, spectral response model
Enclose the features such as width, impact resistance, big, the life-span length of dissipated power.Owing to photoconductive effect is only limited to the skin layer of illumination, because of
This optoelectronic semiconductor 513(such as cadmium sulfide) all do straticulation.In order to obtain high sensitivity, the electrode one of photoconductive resistance
As use pectinate texture, as figure.The operation principle of photoconductive resistance: when unglazed photograph, the resistance of photoconductive resistance is the highest.When being subject to
During to illumination, owing to some photon has the energy more than material energy gap, then the bombardment of photon makes the electronics in valence band
Transit to conduction band after absorbing photon energy, thus inspire electrically conductive electron-hole pair, improve the electric conductivity of material
Energy.The stronger electronics then participating in bombarding of light is the most, and the electron-hole pair inspired is the most, and electric conductivity improves more, resistance
It is worth the lowest.After illumination stops, cave is combined by free electron-sky, and electric conductivity declines, and resistance value replys initial value.
As shown in Fig. 5 .2, the particular resistor that quasiconductor material 522 material such as photoconductive resistance cadmium sulfide or cadmium selenide is made,
Surface scribbles Moisture barrier resins, has photoconductive effect.Photoconductive resistance is the most sensitive to light, and it is when unglazed photograph, resistance value
(dark resistance) is very big, and in circuit, electric current (dark current) is the least.When resistance is by the illumination of a wavelength range, it
Resistance (light resistance) strongly reduces, and in circuit, electric current increases rapidly.It is generally desirable to dark resistance is the bigger the better, light resistance is the least
The best, the sensitivity of now photoconductive resistance is the highest.The dark resistance value of photoconductive resistance is typically in mega-ohms, and light resistance is at several kilo-ohms
Below.Figure is the principle mechanism figure of photoconductive resistance.It is the thin layer semiconductor substance 522 being applied on glass plate 523, half
There is metal electrode 521 at the two ends of conductor 522, and metal electrode 521 is connected with drawing line end, and photoconductive resistance is just by drawing
Line end accesses circuit.In order to prevent the impact of surrounding medium, semiconductor light photosensitive layer 522 covers coast of paint film, paint film
Composition it should be made maximum in photosensitive wave-length coverage internal transmission factor.
As shown in Figure 6, for the embodiment of the present invention by using the label apparatus of multiple antennas to detect a kind of method of lighting change
Flow chart.Need it is contemplated that, device mentioned above uses a label integrated circuit to carry out and the friendship of multiple antennas
Stream.
As shown in Figure 6,50, RFID reader sends energy and instruction to label apparatus.52, logic circuit is when initial
Between be in the state of disconnection, label apparatus the antenna reception energy not being connected with light-sensitive unit and instruction.54, label apparatus
The electromagnetic wave carrying energy is converted into a DC(direct current) voltage, thus label just can be made to perform the requirement of instruction.And
This conversion needs to use an electric charge pump, a rectification circuit, or is connected with each other, or to use other energy
Amount reforming unit.56, label apparatus sends signal by the sky alignment reader not being connected with light-sensitive unit.58, reader
Measure and record the energy intensity receiving signal.60, reader sends the instruction connecting logic circuit to label apparatus.62,
The label apparatus antenna being connected with light-sensitive unit sends data.64, reader measurement receives the energy intensity of signal.66,
Reader calculated goes out the fiducial value of a reaction signal intensity.68, fiducial value is changed into different illumination values by reader.Just
For one example, reader can set a time period for receiving the signal of label, without receiving signal, reads
Signal intensity will be recorded as 0 by device.
In this system, reader is using from the signal strength values of the antenna not being connected with light-sensitive unit as a reference
Value, the signal strength values of the label antenna that it is connected with light-sensitive unit compares.By receive from light
The connected signal with the transmitting terminal not being connected with light-sensitive unit of quick device, reader can collect the ratio representing unlike signal intensity
Relatively it is worth.Then, RFID reader can be converted into the illumination level residing for label such a fiducial value.Concrete with regard to one
Example for, configure this RFID reader be in order to the reference data stored by use by receive from connection
Or the difference being not connected to the RF signal intensity of the antenna of light-sensitive unit is converted into illumination value.
Best situation is, using be not connected to light-sensitive unit antenna as a reference, can by due to label and reader it
Between the change that caused of coupling filter out.Additionally, as previously mentioned, light-sensitive unit is applied to meeting in design
The time length making change and the label of its resistance value be placed under particular light forms relation one to one.Such as,
Light-sensitive unit is only positioned on an antenna, the signal from RFID label tag device so can be allowed as one
Function changes within the specific limits, and the function that this function antenna just just has after being placed on the time under certain illumination.
Ibid, the application of the invention, under conditions of RFID label tag is passive, RFID reader is able to detect that label apparatus is
No be placed under certain illumination and this illumination the most within the acceptable range.
The various RFID label tag not using two antennas also can perceive the change of illumination with light-sensitive unit, perception illumination
Change is also to be able to recognize antenna based on the change of resonant frequency on antenna to receive the change of signal.
Such as by the design to the antenna being connected with light-sensitive unit, it is possible to make the frequency of antenna at ISM(Industrial
Scientific Medical, industry, science, medical science) the interior change of frequency range, the label of standard can connect this and light
The antenna that quick device and logic circuit are connected.
Such as in a concrete example, label antenna can so set, before being exposed in certain photoenvironment, and sky
The resonant frequency of line is 902-928MHZ, but label is once exposed in certain photoenvironment, due to the impact of illumination, sky
The resonant frequency of line just reduces to 899.5-927.5MHZ, divided at the frequency bins (902-928MHZ) of U.S. RFID
Being 52 channels, the channel that can not receive of skipping that reader can be random in these 52 channels goes, and reader is this
The benefit jumped can effectively prevent multiple reader from attempting to use same frequency institute in same physical space exactly
The conflict caused.
The most in one example, RFID frequency range (902-928MHZ) is not divided into 52 channels but averagely divides
The antenna settings having become n channel tag is operated under this frequency range (902-928MHZ).Due to label antenna and light
Quick device is connected, as long as so illumination has exceeded the scope of value set in advance, the operating frequency of antenna tag antenna just declines
Among (899.5-927.5MHZ) this frequency range.Therefore compared with original frequency range just by channel n from frequency range model
Enclosing middle eliminating to go, therefore the frequency range (899.5-927.5MHZ) after change just no longer allows label and channel n to carry out information
Exchange.
In concrete example, if the environment at label place has exceeded intended illumination range, reader can only pass through channel
1 to n-1 sends instruction to label, and label also can be made a response, because the antenna in label just can only be in this frequency range
Interior work, when reader sends instruction with the frequency of n channel to label, because the change of label illumination already leads to label
The resonant frequency of antenna has descended to 899.5-927.5MHZ and no longer reaches 928MHZ so label is the most no longer made a response,
Transmit information back to reader.
Favourable aspect is that the change of the operating frequency of antenna caused beyond value set in advance due to illumination is just by this letter
Cease the disappearance of exchange and reflect.
In a model, reader can further confirm that to label one instruction between channel n-1 and channel n of transmission
Once the operating frequency range of label antenna has occurred that drift, is sent by channel n-1 because label can receive
Instruction, and can by channel n-1 can be to reader feedback information because label can not receive by channel n
The instruction sent, and can not thus determine the work of label antenna to reader feedback information by channel n
Working frequency scope has occurred that drift.
The change of illumination causes the operating frequency of label antenna to occur drift up and down and current invention not to limit
Frequency range is averagely being divided into n channel by system.
The embodiment of the present invention can detect illumination variation at lower cost, and utilizes the energy that RFID obtains, and solves illumination
The powerup issue of detection.
The enforcement of each feature of this system may relate to software, and hardware is likely to relate to the combination ability of software and hardware
Reaching, the enforcement of many advantages of such as system is by programming a kind of high-caliber process and OO programming language
Realize with the mode mutually exchanged of computer and other equipment machines.Each such function program may be stored in one
Individual storage intermediary is read by a computer and processor in such as read only memory and realizes above-mentioned function.
Those skilled in the art are it will also be appreciated that the various illustrative components, blocks (illustrative that list of the embodiment of the present invention
Logical block), unit, and step can pass through electronic hardware, computer software, or both combinations realize.For
Clearly show that the replaceability (interchangeability) of hardware and software, above-mentioned various illustrative components (illustrative
Components), unit and step the most universally describe their function.Such function is by hardware or soft
Part realizes depending on specifically applying the design requirement with whole system.Those skilled in the art can be specific for every kind
Application, it is possible to use the function described in the realization of various methods, but this realization is understood not to protect beyond the embodiment of the present invention
The scope protected.
Various illustrative logical block described in the embodiment of the present invention, or unit can pass through general processor, numeral
Signal processor, special IC (ASIC), field programmable gate array (FPGA) or other FPGA dress
Put, discrete gate or transistor logic, discrete hardware components, or the design of any of the above described combination realizes or operates described
Function.General processor can be microprocessor, alternatively, this general processor can also be any traditional processor,
Controller, microcontroller or state machine.Processor can also realize, such as at digital signal by calculating the combination of device
Reason device and microprocessor, multi-microprocessor, one or more microprocessors one Digital Signal Processor Core of associating, or appoint
What its similar configuration realizes.
Method or the step of algorithm described in the embodiment of the present invention can be directly embedded into hardware, the software mould of processor execution
Block or the combination of both.Software module can be stored in RAM memory, flash memory, ROM memory, EPROM
In memorizer, eeprom memory, depositor, hard disk, moveable magnetic disc, CD-ROM or this area, other is any
In the storage medium of form.Exemplarily, storage medium can be connected with processor, so that processor can be from storage matchmaker
Jie reads information, it is possible to deposit write information to storage medium.Alternatively, storage medium can also be integrated in processor.
Processor and storage medium can be arranged in ASIC, and ASIC can be arranged in user terminal.Alternatively, processor and
Storage medium can also be arranged in the different parts in user terminal.
In one or more exemplary designs, the above-mentioned functions described by the embodiment of the present invention can hardware, software,
The combination in any of firmware or this three realizes.If realized in software, these functions can store the matchmaker with computer-readable
On Jie, or it is transmitted on the medium of computer-readable with one or more instructions or code form.Computer readable medium includes computer
Store medium and be easy to so that allowing computer program transfer to the telecommunication media in other place from a place.Storage medium can be
Any general or special computer can be with the useable medium of access.Such as, such computer readable media can include but not
It is limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device,
Other any may be used for carrying or storage with instruction or data structure and other can by general or special computer or general or
Special processor reads the medium of the program code of form.Additionally, any connection can be properly termed computer-readable
Medium, such as, if software is by coaxial cable, a light from a web-site, server or other remote resource
Fine computer, twisted-pair feeder, Digital Subscriber Line (DSL) or with the wireless way for transmittings such as the most infrared, wireless and microwave also by
It is included in defined computer readable medium.Described video disc (disk) and disk (disc) include Zip disk, radium-shine
Dish, CD, DVD, floppy disk and Blu-ray Disc, disk is generally with magnetic duplication data, and video disc generally carries out light with laser
Learn and replicate data.Combinations of the above can also be included in computer readable medium.
Above-described detailed description of the invention, has been carried out the purpose of the present invention, technical scheme and beneficial effect the most in detail
Illustrate, be it should be understood that the detailed description of the invention that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all should wrap
Within being contained in protection scope of the present invention.
Claims (6)
1. the RFID label tag of a band light-sensitive unit, it is characterised in that have two pins on the chip of described RFID label tag；
Described light-sensitive unit is connected with the two pin, and forms parallel-connection structure with the antenna of described RFID label tag, ambient light photograph
Change can cause the change of the resistance of light-sensitive unit own, on the circuit that described light-sensitive unit is connected with the chip of RFID label tag
There are a logic circuit controlling break-make, the circuit of this connection and the part that the logic circuit controlling break-make is chip, logic
Whether the break-make of circuit determines light-sensitive unit with sky line parallel: when logic circuit disconnects, light-sensitive unit not with sky line parallel,
Now being placed under certain intensity of illumination, the first resonant frequency of antenna and signal intensity keep constant；Work as logic circuit
During connection, light-sensitive unit and sky line parallel, now it is placed under certain intensity of illumination, the characteristic frequency of antenna and signal
Intensity at least has one and changes, and now Antenna Operation is under the second resonant frequency；Described RFID tag RFID
The instruction that reader sends is with the break-make of control logic circuit, thus realizes by the signal comparing the different frequency from antenna
Difference between intensity detects the change of illumination；The antenna of described RFID label tag is monopole antenna or double-doublet antenna；
Wherein, when the antenna of described RFID label tag enters in the alternating magnetic field that RFID reader produces, described RFID marks
Forming transformator between antenna and the antenna of RFID reader signed, with thinking that light-sensitive unit provides energy source, RFID marks
The antenna signed and the antenna of RFID reader are respectively primary coil and the secondary coil of transformator；
Described light-sensitive unit is cadmium sulphide photoconductive cell device, and described cadmium sulphide photoconductive cell device includes: two electrodes, with
And a photosensitive semiconductor, photosensitive semiconductor does straticulation, and said two electrode uses pectinate texture；Or, described cadmium sulfide
Photoconductive resistance device includes: the thin layer semiconductor substance being applied on glass plate, and there is metal at the two ends of thin layer semiconductor substance
Electrode, described thin layer semiconductor substance covers coast of paint film, and described thin layer semiconductor substance is cadmium sulphide membrane layer
Semiconductor substance；
Or, described light-sensitive unit is cadmium slenide photoconductive cell device, and described cadmium slenide photoconductive cell device includes: be applied to glass
Thin layer semiconductor substance on plate, there are metal electrode, described thin layer semiconductor substance in the two ends of thin layer semiconductor substance
On cover coast of paint film, described thin layer semiconductor substance is cadmium selenide thin film layer semiconductor substance.
2. the RFID label tag of band light-sensitive unit as claimed in claim 1, it is characterised in that the antenna of described RFID label tag
During for double-doublet antenna: described light-sensitive unit forms parallel-connection structure with a wherein antenna；Or described light-sensitive unit and two
Antenna concurrently forms parallel-connection structure.
3. the RFID label tag of a band light-sensitive unit, it is characterised in that have a pin on the chip of described RFID label tag；
One end of described light-sensitive unit is connected with this pin, and the other end is connected on the antenna of described RFID label tag, and and antenna
Forming parallel-connection structure, the change of ambient light photograph can cause the change of the resistance of light-sensitive unit own, at described light-sensitive unit and RFID
A logic circuit controlling break-make, the circuit of this connection and the logic electricity controlling break-make is had on the circuit that the chip of label connects
Road is a part for chip, and whether the break-make of logic circuit determines light-sensitive unit with sky line parallel: when logic circuit disconnects,
Light-sensitive unit not with sky line parallel, be now placed under certain intensity of illumination, the first resonant frequency of antenna and signal are strong
Degree keeps constant；When logic circuit is connected, light-sensitive unit and sky line parallel, now it is placed under certain intensity of illumination,
The characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency；Institute
State the instruction break-make with control logic circuit of RFID tag RFID reader transmission, thus realize by relatively coming
Difference between the signal intensity of the different frequency of antenna detects the change of illumination；The antenna of described RFID label tag is single
Pole sub antenna or double-doublet antenna；
Wherein, when the antenna of described RFID label tag enters in the alternating magnetic field that RFID reader produces, described RFID marks
Forming transformator between antenna and the antenna of RFID reader signed, with thinking that light-sensitive unit provides energy source, RFID marks
The antenna signed and the antenna of RFID reader are respectively primary coil and the secondary coil of transformator；
Described light-sensitive unit is cadmium sulphide photoconductive cell device, and described cadmium sulphide photoconductive cell device includes: two electrodes, with
And a photosensitive semiconductor, photosensitive semiconductor does straticulation, and said two electrode uses pectinate texture；Or, described cadmium sulfide
Photoconductive resistance device includes: the thin layer semiconductor substance being applied on glass plate, and there is metal at the two ends of thin layer semiconductor substance
Electrode, described thin layer semiconductor substance covers coast of paint film, and described thin layer semiconductor substance is cadmium sulphide membrane layer
Semiconductor substance；
Or, described light-sensitive unit is cadmium slenide photoconductive cell device, and described cadmium slenide photoconductive cell device includes: be applied to glass
Thin layer semiconductor substance on plate, there are metal electrode, described thin layer semiconductor substance in the two ends of thin layer semiconductor substance
On cover coast of paint film, described thin layer semiconductor substance is cadmium selenide thin film layer semiconductor substance.
4. the RFID label tag of band light-sensitive unit as claimed in claim 3, it is characterised in that the antenna of described RFID label tag
During for double-doublet antenna: described light-sensitive unit forms parallel-connection structure with a wherein antenna；Or described light-sensitive unit and two
Antenna concurrently forms parallel-connection structure.
5. a rfid system for band light-sensitive unit, described rfid system includes RFID label tag and RFID reader,
It is characterized in that,
Described RFID label tag includes the RFID label tag of band light-sensitive unit according to any one of claim 1-2, or right is wanted
Seek the RFID label tag of band light-sensitive unit according to any one of 3-4；
Described RFID reader sends instruction to control the break-make of logic circuit of RFID label tag, thus by compare from
Difference between the signal intensity of the different frequency of antenna detects the change of illumination.
6. the illumination detection method of the rfid system of a band light-sensitive unit, it is characterised in that described illumination detection method
It is applied to the rfid system of band light-sensitive unit described in claim 5, including:
Instruction is sent to control the break-make of the logic circuit of RFID label tag by described RFID reader；
The break-make with control logic circuit is instructed: when logic circuit breaks by what RFID tag RFID reader sent
When opening, light-sensitive unit not with sky line parallel, be now placed under certain intensity of illumination, the first resonant frequency of antenna and
Signal intensity keeps constant；When logic circuit is connected, light-sensitive unit and sky line parallel, now it is placed on certain illumination
Under intensity, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is at the second resonance frequency
Under rate；
Described RFID reader is utilized to compare from the difference between the signal intensity of the different frequency of antenna to detect illumination
Change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210179497.9A CN102750569B (en) | 2012-06-01 | 2012-06-01 | RFID label tag, rfid system and the illumination detection method of a kind of band light-sensitive unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210179497.9A CN102750569B (en) | 2012-06-01 | 2012-06-01 | RFID label tag, rfid system and the illumination detection method of a kind of band light-sensitive unit |
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| CN102750569A CN102750569A (en) | 2012-10-24 |
| CN102750569B true CN102750569B (en) | 2016-08-17 |
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| CN201210179497.9A Expired - Fee Related CN102750569B (en) | 2012-06-01 | 2012-06-01 | RFID label tag, rfid system and the illumination detection method of a kind of band light-sensitive unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2750280C2 (en) * | 2016-12-07 | 2021-06-25 | Порта Сабер Лда | Activation of rfid-transponder with light emission |
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| CN205429173U (en) * | 2015-07-08 | 2016-08-03 | 西安中兴新软件有限责任公司 | Terminal of antenna with but optics reconsitution |
| CN110418528B (en) * | 2019-07-31 | 2021-04-16 | Oppo广东移动通信有限公司 | Electronic device and electronic device control method |
| CN112884097A (en) * | 2021-01-14 | 2021-06-01 | 深圳市通恒伟创科技有限公司 | Internet of things terminal equipment control system based on CMP module |
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|---|---|---|---|---|
| CN1965324A (en) * | 2004-04-08 | 2007-05-16 | 3M创新有限公司 | Variable frequency radio frequency identification (RFID) tags |
| CN101383020A (en) * | 2008-10-14 | 2009-03-11 | 厦门大学 | Environment sensitive type passive electronic label |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8228172B2 (en) * | 2008-09-30 | 2012-07-24 | Motorola Solutions, Inc. | RFID tag device with temperature sensitive antenna |
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2012
- 2012-06-01 CN CN201210179497.9A patent/CN102750569B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1965324A (en) * | 2004-04-08 | 2007-05-16 | 3M创新有限公司 | Variable frequency radio frequency identification (RFID) tags |
| CN101383020A (en) * | 2008-10-14 | 2009-03-11 | 厦门大学 | Environment sensitive type passive electronic label |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2750280C2 (en) * | 2016-12-07 | 2021-06-25 | Порта Сабер Лда | Activation of rfid-transponder with light emission |
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