Label positioning device and label positioning method

Abstract

The embodiments of the present application provide a label positioning device and a label positioning method, which relate to the field of radio frequency identification technology. The label positioning device includes a transmitting module and a receiving module; the transmitting module includes a voltage signal input interface, a first amplifying circuit, and an optical transmitter, the voltage signal input interface is connected to the input end of the first amplifying circuit, and the output end of the first amplifying circuit is connected to the optical transmitter; the receiving module includes a pulse signal input interface, a second amplifying circuit, an optical receiver, and a voltage signal sampling interface, the pulse signal input interface is connected to the first input end of the second amplifying circuit, the optical receiver is connected to the second input end of the second amplifying circuit, the optical transmitter transmits an optical signal to the optical receiver, and the voltage signal sampling interface is connected to the output end of the second amplifying circuit. The label positioning device can achieve the technical effect of improving label positioning efficiency and positioning accuracy, as well as improving the compatibility of different label positioning.

Description

Technical Field

[0001] The present application relates to the field of radio frequency identification technology, and in particular to a tag positioning device and a tag positioning method. Background Art

[0002] Radio Frequency Identification (RFID) is a type of automatic identification technology that uses radio frequency (RF) for contactless, two-way data communication. It uses RF to read and write to recording media (electronic tags or radio frequency cards) to identify targets and exchange data. It is considered one of the most promising information technologies of the 21st century. RFID technology uses radio waves for rapid, contactless information exchange and storage. It combines wireless communication with data access technology, then connects to database systems for contactless, two-way communication, achieving identification and data exchange, thus forming an extremely complex system. In this identification system, electromagnetic waves are used to read, write, and communicate with electronic tags.

[0003] In the existing technology, the transmission power of the transmitter of the tag recognition is fixed, and the amplification factor of the receiving end is fixed. The transmission power of the transmitter or the amplification factor of the receiving end cannot be adjusted. The sensor will not work at the optimal power, which is easy to cause false detection and poor compatibility of tag detection. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a label positioning device and a label positioning method, which can achieve the technical effect of improving label positioning efficiency and positioning accuracy, and improving the compatibility of different label positioning.

[0005] In a first aspect, an embodiment of the present application provides a tag positioning device, comprising a transmitting module and a receiving module;

[0006] The transmitting module includes a voltage signal input interface, a first amplifying circuit, and an optical transmitter, wherein the voltage signal input interface is connected to the input end of the first amplifying circuit, and the output end of the first amplifying circuit is connected to the optical transmitter;

[0007] The receiving module includes a pulse signal input interface, a second amplifying circuit, an optical receiver and a voltage signal sampling interface. The pulse signal input interface is connected to the first input end of the second amplifying circuit, the optical receiver is connected to the second input end of the second amplifying circuit, the optical transmitter transmits an optical signal to the optical receiver, and the voltage signal sampling interface is connected to the output end of the second amplifying circuit.

[0008] In the above implementation process, the transmitting module of the label positioning device includes a voltage signal input interface, a first amplifying circuit, and a light transmitter. The voltage signal input interface provides an input voltage to the first amplifying circuit, thereby controlling the transmission power of the light transmitter; the receiving module includes a pulse signal input interface, a second amplifying circuit, a light receiver and a voltage signal sampling interface. The pulse signal input interface inputs the pulse signal to the first input end of the second amplifying circuit, and the light receiver converts the optical signal of the light transmitter into an electrical signal and inputs it to the second input end of the second amplifying circuit. The output size of the second amplifying circuit can be adjusted by changing the duty cycle of the pulse signal, and sampling is performed by the voltage signal sampling interface. Through the above method, the label positioning device can achieve the technical effect of improving the label positioning efficiency and positioning accuracy, as well as improving the compatibility of different label positioning.

[0009] Furthermore, the transmitting module further includes a triode, and the output end of the first amplifying circuit is connected to the optical transmitter through the triode.

[0010] In the above implementation process, the first amplifying circuit and the optical transmitter are connected via a transistor, thereby facilitating the control and adjustment of the transmission power of the optical transmitter.

[0011] Furthermore, the base of the transistor is connected to the output end of the first amplifier circuit, the collector of the transistor is connected to the light emitter, and the emitter of the transistor is grounded via a resistor.

[0012] In the above implementation process, the base of the transistor is connected to the output end of the first amplifier circuit, and the transmission power of the optical transmitter can be controlled by adjusting the driving current output by the first amplifier circuit to the transistor.

[0013] Furthermore, the first end of the light emitter is connected to a power supply via a resistor, and the second end of the light emitter is connected to the collector of the transistor.

[0014] In the above implementation process, the power supply provides the operating voltage to the optical transmitter, and the second end of the optical transmitter is connected to the collector of the transistor, so as to facilitate the adjustment and control of the transmission power of the optical transmitter.

[0015] Furthermore, the first amplifier circuit includes a first input terminal and a second input terminal, the voltage signal input interface is connected to the first input terminal of the first amplifier circuit, and the second input terminal of the first amplifier circuit is grounded through a resistor.

[0016] In the above implementation process, the second input terminal of the first amplifier circuit and the emitter of the transistor share a resistor that is grounded.

[0017] Furthermore, the receiving module further includes a first resistor and a first capacitor, the first resistor is connected to the pulse signal input interface and the voltage signal sampling interface respectively, and the first capacitor is connected in parallel with the first resistor.

[0018] Furthermore, the receiving module further includes a second resistor and a second capacitor, the first resistor, the second resistor and one end of the second capacitor are connected in sequence, and the other end of the second capacitor is grounded.

[0019] Furthermore, the transmitting module further includes a third resistor and a third capacitor, the voltage signal input interface is grounded through the third resistor, and the third resistor and the third capacitor are connected in parallel.

[0020] Furthermore, the light emitter is a light emitting diode.

[0021] Furthermore, the light receiver is a photodiode.

[0022] In a second aspect, an embodiment of the present application provides a label positioning method, which is applied to the label positioning device according to any one of the first aspects, wherein the label is arranged between the optical transmitter and the optical receiver, and the method includes:

[0023] driving the tag to move and receiving the voltage sampling signal sent by the voltage signal sampling interface;

[0024] The label gap position and the label area position are located according to the voltage sampling signal.

[0025] Furthermore, most tags are composed of two parts: a substrate and a tag signal part. Generally speaking, the part of the tag that only has the substrate refers to the tag gap, and the voltage sampling signal at the tag gap is the highest. By using a penetrating sensor, the light signal emitted by the light transmitter will penetrate the substrate or the substrate + tag signal part. If the light signal only passes through the substrate, more light signals pass through, so the light receiver receives more light and the voltage output of the voltage signal sampling interface is high. If the light signal passes through the substrate + tag signal part, less light signals pass through, so the light receiver receives less light and the voltage output of the voltage signal sampling interface is low. Therefore, the tag gap position and the tag area position can be located based on the voltage sampling signal.

[0026] Furthermore, after the step of locating the label gap position and the label area position according to the voltage sampling signal, the method further includes:

[0027] Moving the tag to the tag gap position, adjusting the input voltage in steps according to a preset step size, and receiving a second voltage sampling signal;

[0028] Moving the label to the label area, adjusting the input voltage in steps according to the preset step size, and receiving a third voltage sampling signal;

[0029] The difference between the second voltage sampling signal and the third voltage signal is calculated, and the input voltage corresponding to the maximum value of the difference is marked as the input voltage reference value.

[0030] In the above implementation process, the input voltage reference value is the optimal value of the voltage signal input interface.

[0031] Furthermore, after the step of marking the input voltage corresponding to the maximum difference value as the input voltage reference value, the method further includes:

[0032] adjusting the input pulse according to the input voltage reference value and receiving a fourth voltage sampling signal;

[0033] When the fourth voltage sampling signal is in a preset interval, the input pulse corresponding to the mark is an input pulse reference value.

[0034] In the above implementation process, the input pulse reference value is the optimal value of the pulse signal input interface.

[0035] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by practicing the above-mentioned technology of the present disclosure.

[0036] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A circuit diagram of a label positioning device provided in an embodiment of the present application;

[0039] Figure 2 A flowchart of a tag positioning method provided in an embodiment of the present application;

[0040] Figure 3 A schematic diagram of a process for determining an input voltage reference value provided in an embodiment of the present application;

[0041] Figure 4A schematic diagram of a flow chart for determining an input pulse reference value provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0043] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0044] The embodiments of the present application provide a label positioning device and a label positioning method, which can be applied to radio frequency identification technology; the transmitting module of the label positioning device includes a voltage signal input interface, a first amplifying circuit, and an optical transmitter, and the voltage signal input interface provides an input voltage to the first amplifying circuit, thereby controlling the transmission power of the optical transmitter; the receiving module includes a pulse signal input interface, a second amplifying circuit, an optical receiver and a voltage signal sampling interface, the pulse signal input interface inputs a pulse signal to the first input end of the second amplifying circuit, the optical receiver converts the optical signal of the optical transmitter into an electrical signal and inputs it to the second input end of the second amplifying circuit, and the output size of the second amplifying circuit can be adjusted by changing the duty cycle of the pulse signal, and sampling is performed by the voltage signal sampling interface; through the above method, the label positioning device can achieve the technical effect of improving label positioning efficiency and positioning accuracy, as well as improving the compatibility of different label positioning.

[0045] See Figure 1 , Figure 1 A circuit diagram of a tag positioning device provided in an embodiment of the present application includes a transmitting module 10 and a receiving module 20.

[0046] Exemplarily, the transmitting module 10 includes a voltage signal input interface 11 , a first amplifying circuit 12 , and an optical transmitter 13 . The voltage signal input interface 11 is connected to the input end of the first amplifying circuit 12 , and the output end of the first amplifying circuit 12 is connected to the optical transmitter 13 .

[0047] Exemplarily, the receiving module 20 includes a pulse signal input interface 21, a second amplifying circuit 22, an optical receiver 23 and a voltage signal sampling interface 24, the pulse signal input interface 21 is connected to the first input end of the second amplifying circuit 22, the optical receiver 23 is connected to the second input end of the second amplifying circuit 22, the optical transmitter 13 transmits an optical signal to the optical receiver 23, and the voltage signal sampling interface 24 is connected to the output end of the second amplifying circuit.

[0048] Exemplarily, the transmitting module 10 of the label positioning device includes a voltage signal input interface 11, a first amplifying circuit 12, and a light transmitter 13. The voltage signal input interface 11 provides an input voltage to the first amplifying circuit 12, thereby controlling the transmission power of the light transmitter 13; the receiving module 20 includes a pulse signal input interface 21, a second amplifying circuit 22, a light receiver 23 and a voltage signal sampling interface 24. The pulse signal input interface 21 inputs the pulse signal to the first input end of the second amplifying circuit 22, and the light receiver 23 converts the optical signal of the light transmitter 13 into an electrical signal and inputs it to the second input end of the second amplifying circuit 22. The output size of the second amplifying circuit 22 can be adjusted by changing the duty cycle of the pulse signal, and sampling is performed by the voltage signal sampling interface 24. In the above manner, the label positioning device can achieve the technical effect of improving the label positioning efficiency and positioning accuracy, as well as improving the positioning compatibility of different labels.

[0049] In some embodiments, the transmitting module 10 further includes a transistor C1 , and the output end of the first amplifying circuit 12 is connected to the optical transmitter 13 via the transistor C1 .

[0050] Exemplarily, the first amplifying circuit 12 and the optical transmitter 13 are connected via a transistor C1 , thereby facilitating control and adjustment of the transmission power of the optical transmitter 13 .

[0051] In some embodiments, the base of the transistor C1 is connected to the output end of the first amplifier circuit 12 , the collector of the transistor C1 is connected to the light emitter 13 , and the emitter of the transistor C1 is grounded via the resistor R4 .

[0052] Exemplarily, the base of the transistor C1 is connected to the output end of the first amplifier circuit 12 , and the emission power of the optical transmitter 13 can be controlled by adjusting the driving current Q1 outputted from the first amplifier circuit to the transistor C1 .

[0053] In some embodiments, a first end of the light emitter 13 is connected to a power source VCC via a resistor R1 , and a second end of the light emitter 13 is connected to a collector of a transistor C1 .

[0054] Exemplarily, the power supply VCC provides an operating voltage to the light emitter, and the second end of the light emitter 13 is connected to the collector of the transistor C1 to facilitate adjustment and control of the transmission power of the light emitter 13 .

[0055] In some embodiments, the first amplifier circuit 12 includes a first input terminal and a second input terminal. The voltage signal input interface 11 is connected to the first input terminal of the first amplifier circuit 12 , and the second input terminal of the first amplifier circuit 12 is grounded via a resistor R4 .

[0056] Optionally, the second input terminal of the first amplifier circuit 12 and the emitter of the transistor C1 share a resistor R4 that is grounded.

[0057] In some embodiments, the receiving module 20 further includes a first resistor C5 and a first capacitor R10. The first resistor R10 is connected to the pulse signal input interface 21 and the voltage signal sampling interface 24 respectively. The first capacitor C5 is connected in parallel to the first resistor R10.

[0058] In some embodiments, the receiving module 20 further includes a second resistor R12 and a second capacitor C6 , one end of the first resistor R10 , the second resistor R12 , and the second capacitor C6 are connected in sequence, and the other end of the second capacitor C6 is grounded.

[0059] In some embodiments, the transmitting module 10 further includes a third resistor R3 and a third capacitor C2 , the voltage signal input interface 11 is grounded through the third resistor R3 , and the third resistor R3 and the third capacitor C2 are connected in parallel.

[0060] Optionally, the light emitter 13 is a light emitting diode.

[0061] For example, a light emitting diode (LED) is a commonly used light emitting device that emits light by releasing energy through the recombination of electrons and holes. It is made of compounds containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N), etc. When electrons and holes recombine, they can radiate visible light and can therefore be used to make light emitting diodes. They are used as indicator lights in circuits and instruments, or to form text or digital displays. Gallium arsenide diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light, and gallium nitride diodes emit blue light. Due to their chemical properties, they are divided into organic light emitting diodes (OLEDs) and inorganic light emitting diodes (LEDs).

[0062] Illustratively, the light receiver 23 is a photodiode.

[0063] For example, a photodiode (PD), like a regular diode, is a semiconductor device consisting of a PN junction and has unidirectional conductivity. However, in a circuit, it does not act as a rectifier, but rather as a photoelectric sensor that converts light signals into electrical signals.

[0064] When a reverse voltage is applied, ordinary diodes are cut off, allowing only a weak reverse current to flow. However, photodiodes are designed and manufactured to maximize the area of the PN junction to facilitate the reception of incident light. Photodiodes operate under reverse voltage. In the absence of light, the reverse current is extremely weak, known as dark current. In the presence of light, the reverse current rapidly increases to tens of microamperes, known as photocurrent. The greater the light intensity, the greater the reverse current. Changes in light cause changes in the photodiode current, converting the optical signal into an electrical signal, thus becoming a photoelectric sensor.

[0065] See Figure 2 , Figure 2 A flowchart of a tag positioning method provided in an embodiment of the present application, which is applied to Figure 1 The label positioning device shown, wherein the label is disposed between the light emitter 13 and the light receiver 23, comprises the following steps:

[0066] S100: driving the tag to move and receiving a voltage sampling signal sent by a voltage signal sampling interface.

[0067] S200: Locating the label gap position and the label area position according to the voltage sampling signal.

[0068] Exemplarily, a tag is mostly composed of two parts: a substrate and a tag signal part. Generally speaking, the part of the tag that only has the substrate refers to the tag gap, and the voltage sampling signal at the tag gap is the highest. By using a penetrating sensor, the light signal emitted by the light emitter 13 will penetrate the substrate or the substrate + tag signal part. If the light signal only passes through the substrate, more light signals pass through, so the light receiver 23 receives more light, and the voltage output of the voltage signal sampling interface 24 is high. If the light signal passes through the substrate + tag signal part, less light signals pass through, so the light receiver 23 receives less light, and the voltage output of the voltage signal sampling interface 24 is low. Therefore, the tag gap position and the tag area position can be located according to the voltage sampling signal.

[0069] In some implementations, the output range of the voltage signal sampling interface 24 may be adjusted by appropriately adjusting the pulse signal of the pulse signal input interface according to the voltage sampling signal actually detected by the voltage signal sampling interface 24 .

[0070] See Figure 3 , Figure 3 A flowchart of determining an input voltage reference value provided in an embodiment of the present application, applied after S200, includes the following steps:

[0071] S300: moving the tag to a tag gap position, adjusting the input voltage in steps according to a preset step size, and receiving a second voltage sampling signal.

[0072] S400: moving the tag to the tag area, adjusting the input voltage in steps according to a preset step size, and receiving a third voltage sampling signal.

[0073] S500: Calculate the difference between the second voltage sampling signal and the third voltage signal, and mark the input voltage corresponding to the maximum value of the difference as the input voltage reference value.

[0074] See Figure 4 , Figure 4A flowchart of determining an input pulse reference value provided in an embodiment of the present application, applied after S500, includes the following steps:

[0075] S600: Adjust the input pulse according to the input voltage reference value and receive a fourth voltage sampling signal.

[0076] S700: When the fourth voltage sampling signal is in a preset interval, marking the corresponding input pulse as an input pulse reference value.

[0077] In some implementation scenarios, the tag positioning method is applied to the tag positioning of a radio frequency identification module, which includes a control chip; optionally, a voltage signal input interface 11 is connected to a DA output terminal of the control chip and input to a first amplifier circuit 12, thereby controlling the transmission power of the optical transmitter 13; a pulse signal input interface 21 is connected to a PWM output terminal of the control chip and input to a second amplifier circuit 22, and by changing the duty cycle of the pulse signal of the pulse signal input interface 21, the output size of the second amplifier circuit 22 can be adjusted; a voltage signal sampling interface 24 is connected to an AD input terminal of the control chip, and the AD input terminal samples the voltage signal sampling interface 24.

[0078] In some embodiments, the control chip outputs a preset voltage signal and a preset pulse signal to the voltage signal input interface and the pulse signal input interface, respectively. The control chip then drives the tag to move, controlling the tag forward through the motor. The AD input terminal of the control chip samples the data from the voltage signal sampling interface 24 to obtain an AD input signal (voltage sampling signal). When two very close AD input signals are detected, the tag movement stops. The tag position corresponding to the highest AD input signal is found, and the tag is driven to move to that position. The voltage value output to the voltage signal input interface 11 is adjusted from low to high with a precision of a preset step size (e.g., 0.1V). The AD input terminal of the control chip can obtain a set of AD values (second voltage signal), which is recorded as AD_H. The tag position corresponding to the second highest AD input signal is then found, and the tag is driven to move to that position. The voltage value output to the voltage signal input interface 11 is also adjusted from low to high with a precision of 0.1V. The AD input terminal of the control chip can obtain another set of AD values (third voltage signal), which is recorded as AD_L. When the voltage signal input interface 11 has the same voltage, the difference between AD_H and AD_L is calculated to obtain a difference sequence, and the maximum value of the difference sequence is selected. At this time, the voltage value corresponding to the voltage signal input interface 11 is the input voltage reference value V m , V m The optimal input voltage of the voltage signal input interface 11 is recorded.

[0079] In some embodiments, V mSet the input voltage of the voltage signal input interface 11 to drive the tag to the gap position, adjust the pulse signal duty cycle of the pulse signal input interface 21, so that the fourth voltage sampling signal output by the voltage signal sampling interface 24 is in a preset range, for example, adjusted to close to 3V (3V is the range with high AD conversion accuracy), and record the pulse signal of the pulse signal input interface 21 corresponding to this time as the input pulse reference value, which is the optimal value. In this way, the V suitable for the tag can be obtained. m and pulse optimum value, use V m The tag is detected with the optimal pulse value, achieving the highest accuracy.

[0080] In the several embodiments provided in this application, it should be understood that the functional modules in each embodiment can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0081] The foregoing is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0082] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0083] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A label positioning device, characterized in that: Includes a transmitting module and a receiving module; The transmitting module includes a voltage signal input interface, a first amplifying circuit, and an optical transmitter, wherein the voltage signal input interface is connected to the input end of the first amplifying circuit, and the output end of the first amplifying circuit is connected to the optical transmitter; The receiving module includes a pulse signal input interface, a second amplifying circuit, an optical receiver and a voltage signal sampling interface, wherein the pulse signal input interface is connected to the first input end of the second amplifying circuit, the optical receiver is connected to the second input end of the second amplifying circuit, the optical transmitter transmits an optical signal to the optical receiver, and the voltage signal sampling interface is connected to the output end of the second amplifying circuit; The voltage signal sampling interface is used to obtain a second voltage sampling signal when the tag moves to the tag gap position and a third voltage sampling signal when the tag moves to the tag area position, and the input voltage reference value of the voltage signal input interface is set to the maximum difference between the second voltage sampling signal and the third voltage sampling signal; The voltage signal sampling interface is further used to obtain a fourth voltage sampling signal when the input voltage reference value is input, and set the input pulse value when the fourth voltage sampling signal is in a preset interval as the input pulse reference value of the pulse signal input interface.

2. The label positioning device according to claim 1, characterized in that: The transmitting module also includes a transistor, and the output end of the first amplifier circuit is connected to the light emitter through the transistor; wherein the base of the transistor is connected to the output end of the first amplifier circuit, the collector of the transistor is connected to the light emitter, and the emitter of the transistor is grounded through a resistor.

3. The label positioning device according to claim 2, characterized in that: The first end of the light emitter is connected to a power supply via a resistor, and the second end of the light emitter is connected to the collector of the transistor.

4. The label positioning device according to claim 1, characterized in that: The first amplifier circuit includes a first input terminal and a second input terminal. The voltage signal input interface is connected to the first input terminal of the first amplifier circuit. The second input terminal of the first amplifier circuit is grounded through a resistor.

5. The label positioning device according to claim 1, characterized in that: The receiving module further includes a first resistor and a first capacitor, the first resistor is connected to the pulse signal input interface and the voltage signal sampling interface respectively, and the first capacitor is connected in parallel with the first resistor.

6. The label positioning device according to claim 5, characterized in that: The receiving module further includes a second resistor and a second capacitor. The first resistor, the second resistor, and one end of the second capacitor are connected in sequence, and the other end of the second capacitor is grounded.

7. The label positioning device according to claim 6, characterized in that: The transmitting module further includes a third resistor and a third capacitor. The voltage signal input interface is grounded through the third resistor. The third resistor and the third capacitor are connected in parallel.

8. A label positioning method, applied to the label positioning device according to any one of claims 1 to 7, characterized in that: The tag is disposed between the light transmitter and the light receiver, and the method includes: driving the tag to move and receiving the voltage sampling signal sent by the voltage signal sampling interface; Locating the label gap position and the label area position according to the voltage sampling signal; The method further comprises: Moving the tag to the tag gap position, adjusting the input voltage in steps according to a preset step size, and receiving a second voltage sampling signal; Moving the label to the label area, adjusting the input voltage in steps according to the preset step size, and receiving a third voltage sampling signal; Calculating a difference between the second voltage sampling signal and the third voltage signal, and marking an input voltage corresponding to a maximum value of the difference as an input voltage reference value; The method further comprises: adjusting the input pulse according to the input voltage reference value and receiving a fourth voltage sampling signal; When the fourth voltage sampling signal is in a preset interval, the input pulse corresponding to the mark is an input pulse reference value.

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