A radio frequency identification ID laser marking method

Abstract

The present invention discloses a radio frequency identification ID laser marking method, comprising: in response to detecting a change in the intensity of a reflected electromagnetic wave of a metal environment, controlling the frequency of the electromagnetic wave of the reader / writer emitted by the first reader / writer to increase; in response to detecting the electromagnetic wave of the tag and reaching a first preset intensity, controlling the frequency of the electromagnetic wave of the reader / writer to stop increasing; recording the attenuation change of the electromagnetic wave of the tag within a preset time period; predicting the attenuation trend of the electromagnetic wave of the tag according to the attenuation change; generating an impedance adjustment trend instruction according to the predicted attenuation trend; sending the impedance trend adjustment instruction to the first electronic tag, so that the first electronic tag receives and adjusts the impedance of the power supply circuit according to the impedance adjustment trend instruction; demodulating the stabilized electromagnetic wave of the tag to obtain the ID number of the object to be marked; and controlling the laser transmitter to perform laser marking according to the ID number of the object to be marked. The present invention improves the reading rate of the electronic tag in a metal environment and ensures normal laser marking.

Description

Technical Field

[0001] The invention relates to the technical field of laser marking, and in particular to a radio frequency identification (ID) laser marking method. Background Art

[0002] Laser marking technology is one of the largest application areas of laser processing. Laser marking is a marking method that uses high-energy-density lasers to partially irradiate the workpiece, causing the surface material to vaporize or undergo a chemical reaction that changes color, thereby leaving a permanent mark. Laser marking can produce a variety of text, symbols, and patterns, and the character size can range from millimeters to micrometers, which is of special significance for product anti-counterfeiting.

[0003] Radio Frequency Identification (RFID) is a type of automatic identification technology. It uses radio frequency to perform non-contact two-way data communication and uses radio frequency to read and write recording media (electronic tags or radio frequency cards) to achieve the purpose of identifying targets and exchanging data. It is considered to be one of the most promising information technologies in the 21st century. Radio frequency identification technology uses radio waves to quickly exchange information and store information without contact. It combines wireless communication with data access technology and then connects to the database system to achieve non-contact two-way communication, thereby achieving the purpose of identification and data exchange, connecting an extremely complex system in series. In the identification system, the reading, writing and communication of electronic tags are achieved through electromagnetic waves. According to the communication distance, it can be divided into near field and far field. For this reason, the data exchange method between the read / write device and the electronic tag is also correspondingly divided into load modulation and backscatter modulation.

[0004] Now, we can combine RFID technology and laser marking technology to read the content (such as ID number) in the electronic tag on the object, and then mark it on the surface of the object through laser marking to prevent counterfeiting. However, RF is sensitive to the environment, especially the metal environment. Metal reflects electromagnetic waves, which weakens the magnetic field formed by the reader, and the electronic tag cannot provide current to communicate with the reader through magnetoelectricity; furthermore, even if the electronic tag is activated, the metal will be regarded as part of the electronic tag antenna, which increases the impedance of the electronic tag, greatly reduces the electromagnetic wave transmission performance of the electronic tag, and cannot communicate normally with the reader. In the process of RFID laser marking on the assembly line, it is very likely that the electronic tag will be in a metal environment. For example, at least the two walls or brackets of the crawler used to transport objects with electronic tags are made of metal or the marked object itself contains metal, which leads to a decrease in the reading rate of the electronic tag, and laser marking cannot be performed. Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a radio frequency identification ID laser marking method, which aims to improve the reading rate of electronic tags in a metal environment and ensure that objects with electronic tags can be normally laser marked.

[0006] To achieve the above object, the present invention discloses a radio frequency identification (ID) laser marking method, the method comprising:

[0007] In response to the conveyor belt starting to transport the object to be marked with the first electronic tag, controlling the first reader to emit a reader electromagnetic wave at a first frequency in a preset direction; wherein the first reader is arranged on the side and / or bottom of the conveyor belt;

[0008] In response to detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, controlling the frequency of the reader / writer electromagnetic wave emitted by the first reader / writer to slowly increase; wherein the reflected electromagnetic wave is an electromagnetic wave reflected by a metal object in the metal environment;

[0009] In response to detecting the tag electromagnetic wave of the second frequency and the tag electromagnetic wave reaching a first preset intensity, controlling the reader / writer electromagnetic wave frequency emitted by the first reader / writer to stop increasing;

[0010] Recording the attenuation changes of the electromagnetic wave of the tag within a preset time period; predicting the attenuation trend of the electromagnetic wave of the tag according to the attenuation changes; generating an impedance adjustment trend instruction according to the predicted attenuation trend;

[0011] The impedance adjustment trend instruction is sent to the first electronic tag through the reader / writer electromagnetic wave of the first reader / writer, so that the first electronic tag receives the impedance adjustment trend instruction and adjusts the impedance of the power supply circuit in the first electronic tag according to the impedance adjustment trend instruction, ensuring that the energy provided by the power supply circuit is sufficient to ensure that the intensity of the electromagnetic wave of the tag is maintained within the standard communication intensity range; wherein the standard communication intensity range is the electromagnetic wave intensity range based on the stable communication between the first reader / writer and the first electronic tag, and the first preset intensity is greater than any value in the standard communication intensity range;

[0012] In response to the intensity of the tag electromagnetic wave received by the first reader being maintained within the standard communication intensity range, the tag electromagnetic wave is demodulated to obtain the ID number of the object to be marked;

[0013] In response to the object to be marked arriving at the marking position, the laser emission head is controlled to perform laser marking according to the ID number of the object to be marked.

[0014] Optionally, the method further includes:

[0015] Before detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, controlling the first reader to periodically transmit and receive electromagnetic waves;

[0016] After detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, the first reader / writer is controlled to continuously transmit and receive electromagnetic waves.

[0017] Optionally, in response to detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, controlling the frequency of the reader / writer electromagnetic wave emitted by the first reader / writer to slowly increase includes:

[0018] In response to detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, determining a frequency increase rate of the electromagnetic wave of the first reader / writer according to a speed of change in the intensity of the reflected electromagnetic wave;

[0019] According to the frequency growth rate, the frequency of the reader / writer electromagnetic wave emitted by the first reader / writer is controlled to increase.

[0020] Optionally, predicting the fading trend of the tag electromagnetic wave according to the fading change includes:

[0021] According to the attenuation change of the tag electromagnetic wave, obtaining the tag electromagnetic wave intensity corresponding to each time point;

[0022] Fitting each of the time points with the tag electromagnetic wave intensity corresponding to each of the time points to generate a fading change function;

[0023] The fading trend of the tag electromagnetic wave is predicted according to the fading variation function.

[0024] Optionally, generating an impedance adjustment trend instruction according to the predicted fading trend includes:

[0025] According to the predicted fading trend, the intensity of the electromagnetic wave of the tag at each future time point is obtained;

[0026] According to the intensity of the electromagnetic wave of the tag at each of the future time points, obtaining the impedance of the first electronic tag corresponding to the future time point;

[0027] Determining the magnitude of the impedance of the first electronic tag at each of the future time points that needs to be adjusted according to the impedance of the first electronic tag at each of the future time points and the standard communication strength range;

[0028] An impedance adjustment trend instruction is generated according to the amplitude by which the impedance of the first electronic tag needs to be adjusted at each of the future time points; wherein the impedance adjustment trend instruction includes an adjustment time and an adjustment size corresponding to the adjustment time.

[0029] Optionally, the first electronic tag receives the impedance adjustment trend instruction, and adjusts the impedance of the power supply circuit in the first electronic tag according to the impedance adjustment trend instruction to ensure that the energy provided by the power supply circuit is sufficient to ensure that the intensity of the electromagnetic wave of the tag is maintained within the standard communication intensity range, including:

[0030] The first electronic tag receives and demodulates the electromagnetic wave emitted by the first reader / writer to obtain the impedance adjustment trend instruction;

[0031] The first electronic tag adjusts the resistance value of the adjustable resistor over time according to the impedance adjustment trend instruction, thereby changing the impedance to ensure that the energy provided by the power supply circuit is sufficient to ensure that the intensity of the tag's electromagnetic wave is maintained within the standard communication intensity range.

[0032] Optionally, the surface of the first electronic tag is coated with a wave-absorbing coating to increase absorption of electromagnetic waves from the reader / writer.

[0033] Beneficial effects of the present invention: 1. In response to detecting a change in the intensity of the reflected electromagnetic wave of the metal environment, the present invention controls the frequency of the electromagnetic wave emitted by the first reader to increase; in response to detecting the electromagnetic wave of the tag and reaching the first preset intensity, the frequency of the electromagnetic wave of the reader is controlled to stop increasing; the attenuation change of the electromagnetic wave of the tag is recorded within a preset time period; according to the attenuation change, the attenuation trend of the electromagnetic wave of the tag is predicted; according to the predicted attenuation trend, an impedance adjustment trend instruction is generated; the impedance adjustment trend instruction is sent to the first electronic tag, so that the first electronic tag receives and adjusts the impedance of the power supply circuit according to the impedance adjustment trend instruction; the stabilized electromagnetic wave of the tag is demodulated to obtain the ID number of the object to be marked; the laser transmitter is controlled to perform laser marking according to the ID number of the object to be marked. It has the following advantages: 1. Compared with the existing reader that always emits electromagnetic waves of the same frequency. The present invention controls the frequency of the electromagnetic wave emitted by the first reader to increase until the first electronic tag emits the electromagnetic wave of the tag, so as to avoid the problem that the electromagnetic wave of the reader with a constant frequency is not strong enough to provide energy to the first electronic tag due to interference from the metal environment and cannot establish communication. 2. The present invention can predict the fading trend of the tag electromagnetic wave, and adjust the impedance of the electronic tag according to the fading trend. The change of impedance enables the first electronic tag to have enough energy to maintain the stability of the intensity of the emitted tag electromagnetic wave in a metal environment without relying on the high-intensity reader electromagnetic wave. The present invention can solve the hysteresis problem of real-time impedance adjustment and avoid the energy waste problem caused by the need to continuously increase the reader electromagnetic wave frequency by adjusting the impedance through the fading trend. 3. When the tag electromagnetic wave reaches the first preset intensity, the present invention stops increasing the reader electromagnetic wave frequency and adjusts the impedance of the first electronic tag instead. This ensures that the reader electromagnetic wave frequency will not reduce its ability to bypass obstacles due to the continuous increase, and can also reduce energy waste. 2. According to the fading change of the tag electromagnetic wave, the present invention obtains the tag electromagnetic wave intensity corresponding to each time point; fits the tag electromagnetic wave intensity corresponding to each time point to generate a fading change function; and predicts the fading trend of the tag electromagnetic wave according to the fading change function. The present invention predicts the fading trend of the tag electromagnetic wave by function fitting, ensuring the accuracy of the prediction. 3. The surface of the first electronic tag of the present invention is coated with an absorbing coating, which can increase the absorption of the electromagnetic wave of the reader, ensure the efficiency of magnetoelectricity, and reduce the interference of the metal environment. In summary, the present invention controls and adjusts the transmission frequency of the first reader and adjusts the impedance of the first electronic tag according to the attenuation trend of the electromagnetic wave of the tag, reduces the interference of the metal environment on the reading of the electronic tag, improves the reading success rate, and ensures that the object with the electronic tag can be laser marked normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1It is a flow chart of a radio frequency identification ID laser marking method provided by a specific embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of a radio frequency identification ID laser marking production line provided by a specific embodiment of the present invention;

[0036] Figure 3 It is a schematic diagram of a fading variation function provided by a specific embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention discloses a radio frequency identification ID laser marking method. Those skilled in the art can refer to the content of this article and appropriately improve the technical details to achieve it. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0038] The applicant has found through research that during the process of RFID laser marking on the assembly line, the electronic tag is likely to be in a metal environment. For example, at least two walls or brackets of the track used to transport objects with electronic tags are made of metal or the marked object itself contains metal, which leads to a decrease in the reading rate of the electronic tag and makes it impossible to perform laser marking. The constant frequency emitted by the reader cannot guarantee that it can provide enough energy for the electronic tag to emit electromagnetic waves in a metal environment; the real-time change of impedance to adapt to the metal environment has a lag, resulting in the effect after adjustment not meeting the requirements.

[0039] Therefore, an embodiment of the present invention provides a radio frequency identification ID laser marking method, such as Figure 1 As shown, the method includes:

[0040] Step S101: In response to a conveyor belt starting to transport an object to be marked with a first electronic tag, a first reader is controlled to emit a reader electromagnetic wave at a first frequency in a preset direction.

[0041] The first reader / writer is arranged on the side and / or bottom of the conveyor belt.

[0042] It should be noted that RFID ID laser marking is usually carried out through an assembly line, and the assembly line equipment or brackets contain metal to a greater or lesser extent, thus forming a metal environment.

[0043] RFID ID laser marking line can be Figure 2As shown, it includes: a conveyor belt 201, a first reader / writer 202, a first electronic tag 203, a laser transmitter head 204 and a marked object 205.

[0044] Step S102: In response to detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, controlling the frequency of the reader / writer electromagnetic wave emitted by the first reader / writer to gradually increase.

[0045] The reflected electromagnetic waves are electromagnetic waves reflected by metal objects in a metal environment.

[0046] It should be noted that when the reflected electromagnetic wave in the embodiment of the present invention changes, it means that the first electronic tag begins to enter the metal environment relative to the first reader / writer. Since the first electronic tag absorbs part of the reader / writer electromagnetic wave, the intensity of the reflected electromagnetic wave becomes weaker. The present invention can use this point to well judge whether the first electronic tag has entered the range where reading and writing can be performed. The purpose of controlling the reader / writer electromagnetic wave frequency to increase slowly is to avoid the situation where the initial frequency of the reader / writer electromagnetic wave is not enough to activate the power supply circuit of the first electronic tag, resulting in the first electronic tag being unable to emit the tag electromagnetic wave.

[0047] Optionally, in response to detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, controlling the frequency of the reader / writer electromagnetic wave emitted by the first reader / writer to slowly increase includes:

[0048] In response to detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, determining a frequency increase speed of the electromagnetic wave of the first reader / writer according to a speed of change of the intensity of the reflected electromagnetic wave;

[0049] According to the frequency increase speed, the frequency of the reader / writer electromagnetic wave emitted by the first reader / writer is controlled to increase.

[0050] It should be noted that the speed at which the reader's electromagnetic wave frequency increases cannot be too fast or too slow. If it is too fast, it will easily waste energy, while if it is too slow, the communication efficiency will be low.

[0051] Step S103: in response to detecting the tag electromagnetic wave of the second frequency and the tag electromagnetic wave reaching the first preset intensity, controlling the reader / writer electromagnetic wave frequency emitted by the first reader / writer to stop increasing.

[0052] It should be noted that the intensity of electromagnetic waves is determined by frequency and amplitude. In the embodiment of the present invention, if the electromagnetic waves have the same frequency, the greater the amplitude, the greater the intensity. The purpose of making the tag electromagnetic wave reach the first preset intensity is to ensure that the tag electromagnetic wave has room to weaken and will not disappear all at once. The preset time is obtained through multiple experiments. Within the preset time, the tag electromagnetic wave of the first preset intensity will not weaken to disappear. The purpose of doing this is to obtain the attenuation trend of the tag electromagnetic wave.

[0053] In addition, the control of the reader / writer electromagnetic wave frequency emitted by the first reader / writer to stop increasing is to prevent the reader / writer electromagnetic wave frequency from being too high and the performance of bypassing obstacles being poor. In addition, if the frequency is continuously increased, the energy consumption will increase significantly.

[0054] Step S104: recording the attenuation changes of the tag electromagnetic wave within a preset time period; predicting the attenuation trend of the tag electromagnetic wave according to the attenuation changes; and generating an impedance adjustment trend instruction according to the predicted attenuation trend.

[0055] Optionally, based on the fading change, the fading trend of the tag electromagnetic wave is predicted, including:

[0056] According to the attenuation change of the tag electromagnetic wave, the tag electromagnetic wave intensity corresponding to each time point is obtained;

[0057] Fitting each time point with the tag electromagnetic wave intensity corresponding to each time point to generate a fading change function;

[0058] According to the fading change function, the fading trend of the tag electromagnetic wave is predicted.

[0059] Specifically, the fading change function can be expressed as Figure 3 As shown, Figure 3 The solid line part of the curve is the recorded attenuation change, and the dotted line part is the predicted attenuation trend.

[0060] It should be noted that, because the electronic tag enters the metal environment at a uniform speed according to the conveyor belt, its speed of shielding the metal is regular, so the attenuation of the tag electromagnetic wave of the first electronic tag can also be predicted. The attenuation trend can be obtained more accurately through the fitting function, and it can also be predicted in combination with historical data. The historical data can be the data of the natural attenuation of the tag electromagnetic wave emitted by the first electronic tag in the metal environment.

[0061] Optionally, according to the predicted fading trend, an impedance adjustment trend instruction is generated, including:

[0062] According to the predicted fading trend, the intensity of the tag electromagnetic wave at each future time point is obtained;

[0063] Obtaining the impedance of the first electronic tag corresponding to each future time point according to the intensity of the tag electromagnetic wave at each future time point;

[0064] Determine the magnitude of the impedance of the first electronic tag at each future time point that needs to be adjusted according to the impedance size of the first electronic tag at each future time point and the standard communication strength range;

[0065] An impedance adjustment trend instruction is generated according to the amplitude of the impedance adjustment required for the first electronic tag at each future time point; wherein the impedance adjustment trend instruction includes an adjustment time and an adjustment size corresponding to the adjustment time.

[0066] It should be noted that the adjustment size corresponding to each adjustment time in the impedance adjustment trend instruction needs to be determined according to the adjustment size corresponding to the previous adjustment time.

[0067] It is worth mentioning that the embodiment of the present invention performs adjustment according to the impedance adjustment trend instruction, which solves the problem of hysteresis in real-time impedance adjustment and does not need to send adjustment instructions multiple times.

[0068] Step S105: Send the impedance adjustment trend instruction to the first electronic tag through the reader / writer electromagnetic wave of the first reader / writer, so that the first electronic tag receives the impedance adjustment trend instruction and adjusts the power supply circuit impedance in the first electronic tag according to the impedance adjustment trend instruction to ensure that the energy provided by the power supply circuit is sufficient to ensure that the intensity of the tag electromagnetic wave is maintained within the standard communication intensity range.

[0069] The standard communication intensity range is an electromagnetic wave intensity range for stable communication between the first reader and the first electronic tag, and the first preset intensity is greater than any value in the standard communication intensity range.

[0070] It should be noted that the first preset intensity is greater than any value in the standard communication intensity range in order to allow the tag electromagnetic wave to have enough space to decay.

[0071] Optionally, the first electronic tag receives an impedance adjustment trend instruction, and adjusts the impedance of a power supply circuit in the first electronic tag according to the impedance adjustment trend instruction to ensure that the energy provided by the power supply circuit is sufficient to ensure that the intensity of the electromagnetic wave of the tag is maintained within a standard communication intensity range, including:

[0072] The first electronic tag receives and demodulates the electromagnetic wave emitted by the first reader / writer to obtain an impedance adjustment trend instruction;

[0073] The first electronic tag adjusts the resistance value of the adjustable resistor over time according to the impedance adjustment trend instruction, thereby changing the impedance to ensure that the energy provided by the power supply circuit is sufficient to ensure that the intensity of the tag's electromagnetic wave is maintained within the standard communication intensity range.

[0074] It should be noted that the impedance adjustment according to the impedance adjustment trend instruction adopted in the embodiment of the present invention can effectively avoid the problem of adjustment lag.

[0075] Step S106: In response to the intensity of the tag electromagnetic wave received by the first reader being maintained within the standard communication intensity range, the tag electromagnetic wave is demodulated to obtain the ID number of the object to be marked.

[0076] It should be noted that the demodulated tag electromagnetic wave is a tag electromagnetic wave of stable intensity, because unstable tag electromagnetic waves may cause data transmission to be lost during the transmission process.

[0077] Step S107: In response to the object to be marked arriving at the marking position, the laser emission head is controlled to perform laser marking according to the ID number of the object to be marked.

[0078] Optionally, the method further includes:

[0079] Before detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, controlling the first reader / writer to periodically transmit and receive the electromagnetic wave;

[0080] After detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, the first reader / writer is controlled to continuously transmit and receive the electromagnetic wave.

[0081] It should be noted that the purpose of doing so is to effectively reduce energy waste.

[0082] Optionally, the surface of the first electronic tag is coated with a wave-absorbing coating to increase the absorption of electromagnetic waves from the reader / writer.

[0083] It should be noted that the absorbing coating helps to absorb electromagnetic waves, and can make it easier for the first electronic tag to absorb the electromagnetic waves of the reader in a metal environment.

[0084] In response to detecting a change in the intensity of the reflected electromagnetic wave of the metal environment, the embodiment of the present invention controls the frequency of the electromagnetic wave emitted by the first reader to increase; in response to detecting the electromagnetic wave of the tag and reaching the first preset intensity, controls the frequency of the electromagnetic wave of the reader to stop increasing; records the attenuation change of the electromagnetic wave of the tag within a preset time period; predicts the attenuation trend of the electromagnetic wave of the tag according to the attenuation change; generates an impedance adjustment trend instruction according to the predicted attenuation trend; sends the impedance adjustment trend instruction to the first electronic tag, so that the first electronic tag receives and adjusts the impedance of the power supply circuit according to the impedance adjustment trend instruction; demodulates the stabilized electromagnetic wave of the tag to obtain the ID number of the object to be marked; controls the laser transmitter to perform laser marking according to the ID number of the object to be marked. It has the following advantages: 1. Compared with the existing reader that always emits electromagnetic waves of the same frequency. In the embodiment of the present invention, the frequency of the electromagnetic wave emitted by the first reader is controlled to increase until the first electronic tag emits the electromagnetic wave of the tag, so as to avoid the problem that the electromagnetic wave of the reader with a constant frequency is not strong enough to provide energy to the first electronic tag due to the interference of the metal environment and cannot establish communication. 2. The embodiment of the present invention can predict the fading trend of the tag electromagnetic wave, and adjust the impedance of the electronic tag according to the fading trend. The change of impedance enables the first electronic tag to have enough energy to maintain the stability of the intensity of the emitted tag electromagnetic wave in a metal environment without relying on the high-intensity reader electromagnetic wave. The embodiment of the present invention can not only solve the hysteresis problem of real-time impedance adjustment by adjusting the impedance according to the fading trend, but also avoid the energy waste problem caused by the need to continuously increase the reader electromagnetic wave frequency. 3. When the tag electromagnetic wave reaches the first preset intensity, the embodiment of the present invention stops increasing the reader electromagnetic wave frequency and adjusts the impedance of the first electronic tag instead. This ensures that the reader electromagnetic wave frequency will not reduce its ability to bypass obstacles due to the continuous increase, and can also reduce energy waste. According to the fading change of the tag electromagnetic wave, the embodiment of the present invention obtains the tag electromagnetic wave intensity corresponding to each time point and each time point; fits the tag electromagnetic wave intensity corresponding to each time point and each time point to generate a fading change function; and predicts the fading trend of the tag electromagnetic wave according to the fading change function. The embodiment of the present invention predicts the fading trend of the tag electromagnetic wave by function fitting, ensuring the accuracy of the prediction. The surface of the first electronic tag in the embodiment of the present invention is coated with an absorbing coating, which can increase the absorption of the electromagnetic wave of the reader, ensure the efficiency of magnetoelectricity, and reduce the interference of the metal environment. In summary, the embodiment of the present invention controls and adjusts the transmission frequency of the first reader and adjusts the impedance of the first electronic tag according to the attenuation trend of the electromagnetic wave of the tag, reduces the interference of the metal environment on the reading of the electronic tag, improves the reading success rate, and ensures that the object with the electronic tag can be laser marked normally.

[0085] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0086] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0087] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A radio frequency identification ID laser marking method, characterized in that: The method comprises: In response to the conveyor belt starting to transport the object to be marked with the first electronic tag, controlling the first reader to emit a reader electromagnetic wave at a first frequency in a preset direction; wherein the first reader is arranged on the side and / or bottom of the conveyor belt; In response to detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, controlling the frequency of the electromagnetic wave emitted by the first reader to slowly increase; wherein the reflected electromagnetic wave is an electromagnetic wave reflected by a metal object in a metal environment; In response to detecting the tag electromagnetic wave of the second frequency and the tag electromagnetic wave reaching a first preset intensity, controlling the reader / writer electromagnetic wave frequency emitted by the first reader / writer to stop increasing; Recording the attenuation changes of the electromagnetic wave of the tag within a preset time period; predicting the attenuation trend of the electromagnetic wave of the tag according to the attenuation changes; generating an impedance adjustment trend instruction according to the predicted attenuation trend; The impedance adjustment trend instruction is sent to the first electronic tag through the reader / writer electromagnetic wave of the first reader / writer, so that the first electronic tag receives the impedance adjustment trend instruction and adjusts the impedance of the power supply circuit in the first electronic tag according to the impedance adjustment trend instruction, ensuring that the energy provided by the power supply circuit is sufficient to ensure that the intensity of the electromagnetic wave of the tag is maintained within the standard communication intensity range; wherein the standard communication intensity range is the electromagnetic wave intensity range based on the stable communication between the first reader / writer and the first electronic tag, and the first preset intensity is greater than any value in the standard communication intensity range; In response to the intensity of the tag electromagnetic wave received by the first reader being maintained within the standard communication intensity range, the tag electromagnetic wave is demodulated to obtain the ID number of the object to be marked; In response to the object to be marked arriving at the marking position, controlling the laser emission head to perform laser marking according to the ID number of the object to be marked; The step of predicting the fading trend of the tag electromagnetic wave according to the fading change includes: obtaining the tag electromagnetic wave intensity corresponding to each time point according to the fading change of the tag electromagnetic wave; fitting the tag electromagnetic wave intensity corresponding to each time point to generate a fading change function; and predicting the fading trend of the tag electromagnetic wave according to the fading change function. The step of generating an impedance adjustment trend instruction according to the predicted fading trend comprises: According to the predicted fading trend, the intensity of the electromagnetic wave of the tag at each future time point is obtained; according to the intensity of the electromagnetic wave of the tag at each future time point, the impedance size of the first electronic tag corresponding to the future time point is obtained; according to the impedance size of the first electronic tag at each future time point and the standard communication strength range, the amplitude of the impedance of the first electronic tag at each future time point that needs to be adjusted is determined; according to the amplitude of the impedance of the first electronic tag at each future time point that needs to be adjusted, an impedance adjustment trend instruction is generated; wherein the impedance adjustment trend instruction includes an adjustment time and an adjustment size corresponding to the adjustment time.

2. The radio frequency identification ID laser marking method according to claim 1, characterized in that: The method further comprises: Before detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, controlling the first reader to periodically transmit and receive electromagnetic waves; After detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, the first reader / writer is controlled to continuously transmit and receive electromagnetic waves.

3. The radio frequency identification ID laser marking method according to claim 1, characterized in that: In response to detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, controlling the frequency of the electromagnetic wave emitted by the first reader to increase slowly includes: In response to detecting that the intensity of the reflected electromagnetic wave of the first frequency changes, determining a frequency increase rate of the electromagnetic wave of the first reader / writer according to a speed of change in the intensity of the reflected electromagnetic wave; According to the frequency growth rate, the frequency of the reader / writer electromagnetic wave emitted by the first reader / writer is controlled to increase.

4. The radio frequency identification ID laser marking method according to claim 1, characterized in that: The first electronic tag receives the impedance adjustment trend instruction, and adjusts the impedance of the power supply circuit in the first electronic tag according to the impedance adjustment trend instruction to ensure that the energy provided by the power supply circuit is sufficient to ensure that the intensity of the electromagnetic wave of the tag is maintained within the standard communication intensity range, including: The first electronic tag receives and demodulates the electromagnetic wave emitted by the first reader / writer to obtain the impedance adjustment trend instruction; The first electronic tag adjusts the resistance value of the adjustable resistor over time according to the impedance adjustment trend instruction, thereby changing the impedance to ensure that the energy provided by the power supply circuit is sufficient to ensure that the intensity of the tag's electromagnetic wave is maintained within the standard communication intensity range.

5. The radio frequency identification ID laser marking method according to claim 1, characterized in that: The surface of the first electronic tag is coated with a wave absorbing coating to increase the absorption of electromagnetic waves from the reader.

Images