An identification method and device for consumables based on analog signal detection
By using analog signal detection methods and combining various detection circuits and interfaces, the problems of low recognition accuracy and high cost in low-cost inkjet cartridges and inkjet equipment are solved, achieving low-cost and high-accuracy inkjet cartridge recognition, which is applicable to various low-cost inkjet equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAMEN RONGTA TECH
- Filing Date
- 2026-06-08
- Publication Date
- 2026-07-21
AI Technical Summary
Existing methods for identifying inkjet cartridges and inkjet heads suffer from low accuracy, high cost, and poor compatibility, especially in low-priced inkjet cartridges and inkjet devices where they fail to meet identification requirements.
An analog signal-based detection method is adopted, which uses a variety of low-cost detection circuits such as voltage divider detection, operational amplifier current detection, high-pass filter detection, low-pass filter detection, and band-pass filter detection, combined with single-contact and dual-contact interfaces, to achieve accurate identification of inkjet cartridges.
It reduces hardware costs, improves recognition accuracy, covers the recognition needs of all low-cost inkjet cartridges, is compatible with various low-cost inkjet devices, and ensures stable operation of inkjet printers.
Smart Images
Figure CN122425976A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of inkjet printing equipment consumables detection technology, and in particular to a method and apparatus for identifying consumables based on analog signals. Background Technology
[0002] The standard inkjet cartridges used in inkjet printing equipment consist of two parts: the printhead and the ink. The ability to quickly and accurately identify the ink and printhead (the significance of which is as follows: the identification of the printhead and ink enables the inkjet printer to accurately adopt different software control strategies, and even to determine whether it is an authorized consumable) ensures the normal operation of the inkjet printer.
[0003] Currently, inkjet cartridge and printhead identification mainly employs digital and analog identification. While digital identification solutions (such as chip identification and RFID identification) offer high accuracy, they are also costly, requiring additional chips and sensing modules on the inkjet cartridge (printhead or ink tank). This increases both the production cost of the inkjet cartridge and the hardware cost of the inkjet equipment, making it unsuitable for cost-sensitive inkjet devices and low-cost inkjet cartridges. Analog identification solutions, on the other hand, are relatively simple, often employing a single detection method with limited identification dimensions, making them prone to errors. Furthermore, they fail to fully consider the structural characteristics of inkjet cartridges (printhead + ink) and do not comprehensively cover all identification paths for low-cost inkjet cartridges. Consequently, they cannot meet the identification needs of various low-cost inkjet cartridges and devices, exhibiting problems such as limited identification solutions, insufficient cost control, poor compatibility, and weak adaptability. Summary of the Invention
[0004] To overcome the shortcomings of existing inkjet cartridge ink and printhead identification methods, this invention provides an identification method and device based on analog signal detection of consumables. It is compatible with standard inkjet cartridges, integrates multiple low-cost analog signal detection schemes, and can cover both single-contact and dual-contact inkjet cartridges. Through the simplest circuit structure, it minimizes hardware costs while ensuring the accuracy of inkjet cartridge identification, and can completely replace all low-cost inkjet cartridge identification application scenarios.
[0005] The technical solution adopted by this invention to solve its technical problem is: A method for identifying consumables based on analog signal detection includes the following steps: S1: The main control module starts up, selects the corresponding contact interface according to the inkjet cartridge to be tested, and starts the detection circuit that matches the contact interface. S2: Connect the inkjet cartridge to the contact interface, connect the inkjet cartridge contacts to the contact interface, and connect the matching element built into the inkjet cartridge to the corresponding detection circuit. S3: The detection circuit detects the analog characteristics of the matching element and outputs the corresponding analog detection signal to the main control module; S4: The main control module compares the collected detection signal with the preset threshold. When the detection signal falls within the corresponding preset threshold range, it is determined to be a compatible inkjet cartridge. When the detection signal is not within the preset threshold range, it is determined to be an incompatible inkjet cartridge. S5: After the detection is completed, the main control module outputs the recognition result to the inkjet printer; if it is determined to be an incompatible inkjet cartridge, or if it is detected that it is not connected or has a poor connection, an error message is triggered and the system waits for connection again.
[0006] Further, the contact interface in step S1 is configured as a single-contact interface and / or a double-contact interface, and the detection circuit includes: one or more of a voltage divider detection circuit and an operational amplifier current detection circuit matched with the single-contact interface, and / or one or more of a high-pass filter detection circuit, a low-pass filter detection circuit, and a band-pass filter detection circuit matched with the double-contact interface.
[0007] Furthermore, when the contact interface in step S1 is a single contact interface, the voltage divider detection circuit and / or the operational amplifier current detection circuit are activated; in step S2, the inkjet cartridge matching element is a resistor; in step S3, the voltage divider detection circuit outputs the voltage signal after voltage division, the operational amplifier current detection circuit outputs the amplified voltage signal, and the main control module calculates the loop current; and in step S4, the preset threshold is a voltage threshold and / or a current threshold.
[0008] Further, in step S1, the contact interface is a dual-contact interface, activating one or more of the high-pass filter detection circuit, low-pass filter detection circuit, and band-pass filter detection circuit; in step S2, the inkjet cartridge matching element is one or more of the capacitor, resistor, or capacitor and resistor in series; in step S3, the high-pass filter detection circuit and low-pass filter detection circuit output the filtered signal amplitude, and the band-pass filter detection circuit outputs the filtered signal amplitude and center frequency; in step S4, the preset threshold is a signal amplitude threshold and / or a signal amplitude threshold and a center frequency threshold.
[0009] Furthermore, the detection circuit supports individual or combined startup: when the voltage divider detection circuit and the operational amplifier current detection circuit are started simultaneously, the detection signals of both circuits must fall within the corresponding threshold range to determine if the inkjet cartridge is compatible; when two or more of the high-pass filter detection circuit, low-pass filter detection circuit, and band-pass filter detection circuit are started simultaneously, the detection signals of each circuit must fall within the corresponding threshold range to determine if the inkjet cartridge is compatible.
[0010] An identification device for consumables based on analog signal detection is disclosed, which implements a method for identifying consumables based on analog signal detection. The device is integrated on a circuit board and includes a power module, a main control module, an analog signal detection module, and a contact interface module. The power module supplies power to the device. The main control module uses a microcontroller. The contact interface module is configured as a single-contact interface and / or a dual-contact interface. The contact interface module is connected to the contacts of the inkjet cartridge to be tested, and also to the analog signal detection module. The analog signal detection module is electrically connected to the contact interface module and the main control module respectively. The analog signal detection module implements the voltage divider detection circuit, the operational amplifier current detection circuit, the high-pass filter detection circuit, the low-pass filter detection circuit, and the band-pass filter detection circuit.
[0011] Furthermore, the voltage divider detection circuit includes two resistors that are electrically connected.
[0012] Furthermore, the operational amplifier current detection circuit includes multiple resistors and an operational amplifier that are electrically connected.
[0013] Furthermore, both the high-pass filter detection circuit and the low-pass filter detection circuit include an electrically connected resistor and a capacitor, respectively.
[0014] Furthermore, the bandpass filter detection circuit includes two resistors and two capacitors electrically connected.
[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention provides a method and apparatus for identifying consumables based on analog signal detection, adapted to standard inkjet cartridges. It integrates multiple low-cost analog signal detection schemes, covering both single-contact and dual-contact ink cartridge core contact layouts. Through the simplest circuit structure, it minimizes hardware costs while ensuring accurate inkjet cartridge identification. It can comprehensively replace all low-cost inkjet cartridge identification applications, providing strong technical support for the stable and reliable operation of inkjet printers. In summary, this invention has promising application prospects. Attached Figure Description
[0016] Figure 1 This is a circuit diagram of a voltage divider detection circuit for an identification device based on analog signal detection of consumables according to the present invention; Figure 2 This is a circuit diagram of the operational amplifier current detection circuit of an identification device for consumables based on analog signal detection according to the present invention; Figure 3 This is a circuit diagram of a high-pass filter detection circuit for an identification device for consumables based on analog signal detection according to the present invention. Figure 4 This is a circuit diagram of a low-pass filter detection circuit for an identification device based on analog signal detection of consumables according to the present invention; Figure 5 This is a circuit diagram of a bandpass filter detection circuit for an identification device for consumables based on analog signal detection according to the present invention. Figure 6 This is a schematic diagram of the identification method for consumables based on analog signal detection according to the present invention; Figure 7 This is a schematic diagram of the analog signal detection and consumable identification method based on a single-contact interface, a voltage divider detection circuit, and an operational amplifier current detection circuit, according to the present invention. Figure 8 This is a schematic flowchart of the analog signal detection and consumable identification method based on a dual-contact interface, a high-pass filter detection circuit, a low-pass filter detection circuit, and a band-pass filter detection circuit, according to the present invention. Detailed Implementation
[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0018] Figure 1 , 2As shown in Figures 3, 4, and 5, an identification device based on analog signal detection of consumables includes a power supply module, a main control module, an analog signal detection module, and a contact interface module. The power supply module supplies power to the device. The main control module uses a microcontroller. The contact interface module is configured with both single-contact and double-contact interfaces. The contact interface module connects to the contacts of the inkjet cartridge to be tested and also connects to the analog signal detection module. The analog signal detection module is connected to the contact interface module and the main control module via wires. The analog signal detection module includes a voltage divider detection circuit, an operational amplifier current detection circuit, a high-pass filter detection circuit, a low-pass filter detection circuit, and a band-pass filter detection circuit. Specifically, the single-contact and double-contact interfaces of the device can be selectively switched according to the contact design of the inkjet cartridge. All detection functions are implemented using low-cost components, without complex digital circuits, maximizing the reduction of hardware costs and adapting to the cost requirements of low-cost inkjet cartridges and inkjet equipment. The single-contact interface includes a signal contact A and a ground contact. The signal contact is connected to the input terminal of the single-contact interface detection, and the ground contact is directly grounded. This single-contact interface, along with the voltage divider detection circuit and the operational amplifier current detection circuit, is specially adapted for low-cost inkjet cartridges with a single-contact design (the contact can be located at the end of the printhead or the side of the ink tank, corresponding to and fitting the interface of the inkjet printing device; the inkjet cartridge consists of two parts: the printhead and the ink). The voltage divider detection circuit and the operational amplifier current detection circuit can be used independently or in combination. The dual-contact interface includes two signal contacts (contact A and contact B) and one ground contact. The two signal contacts are connected to the two input terminals of the dual-contact interface detection circuit, and the ground contact is directly grounded. This dual-contact interface is specially adapted to low-cost inkjet cartridges with dual-contact design (the two contacts can be set on the printhead and ink tank respectively, or on both the printhead and ink tank, fitting the structural layout of the inkjet cartridge). The high-pass filter detection circuit, low-pass filter detection circuit, and band-pass filter detection circuit can be used individually, in pairs, or all three simultaneously.
[0019] Figure 1As shown in Example 1: An identification device for consumables based on analog signal detection includes a single-contact interface and a voltage divider detection circuit. The voltage divider detection circuit consists of two fixed resistors R1 and R2 connected in series. The signal output terminal of the voltage divider detection circuit is connected to one of the ADC check ports of the microcontroller via a wire. The power module outputs a fixed DC voltage VCC. One end of resistor R1 is connected to VCC, and the other end is connected to resistor R2 and the signal contact A of the single-contact interface. The other end of resistor R2 is grounded. A matching resistor Rf is set for each contact on the inkjet cartridge (the resistance value of Rf varies for different models and specifications of low-priced inkjet cartridges, and the resistance range completely covers the commonly used low-priced resistor specifications). When the inkjet cartridge is connected, the signal contact is connected to one end of the matching resistor Rf of the inkjet cartridge, and the other end of the matching resistor Rf is grounded. At this time, the output terminal of the voltage divider circuit (the connection point of R1 and R2) outputs a voltage divider voltage Vout, Vout = VCC × (R2 || Rf) / (R1 + (R2 || Rf)). Rf)); The microcontroller acquires the ADC signal and accurately identifies the inkjet cartridge model by judging the voltage range of the ADC (distinguishing between different inkjet head models and different inks). Among them, resistors R1 and R2 are selected as 1k-100kΩ resistors, which are adapted to the low power consumption requirements of the inkjet cartridge. Specifically, the power supply VCC is 5V. The microcontroller acquires the voltage Vout output from the voltage divider circuit through the ADC interface and calculates Vout = 5V × (10kΩ || RF) / (10kΩ + (10kΩ || RF)). The preset threshold ranges are as follows (for inkjet cartridges with different inks or printheads): When Rf = 1kΩ (printhead 1 or ink 1), Vout ≈ 0.41V (threshold range 0.35V-0.45V); when Rf = 2kΩ (printhead 2 or ink 2), Vout ≈ 0.71V (threshold range 0.65V-0.76V); when Rf = 5kΩ (printhead 3 or ink 3), Vout ≈ 1.25V (threshold range 1.20V-1.30V). In the voltage divider detection circuit, a resistor Rf is embedded in the ink cartridge consumable and electrically connected to the circuit board through contacts, forming a complete voltage divider check circuit.
[0020] Figure 2As shown in Example 2: An identification device for consumables based on analog signal detection includes a single-contact interface and an operational amplifier current detection circuit. The operational amplifier current detection circuit is built using a general-purpose low-cost operational amplifier U13 (such as RS358). The signal output terminal of the operational amplifier current detection circuit and the second ADC check port of the microcontroller are connected by a wire. The signal of the single-contact interface is connected to VCC through a resistor Rf. The gain of the operational amplifier is set to 11 times by adjusting resistors R1 and R2. The output terminal of the operational amplifier is connected to the ADC check port of the microcontroller. When the inkjet cartridge is connected, the matching resistor Rf set on the contact of the inkjet cartridge forms a loop with the power supply of resistor Rs, generating a loop current I = VCC / (Rs + Rf). The voltage difference Vrs across the input terminal Rs of the operational amplifier is I × Rs. After amplifying Vrs, it is output to the microcontroller ADC. The microcontroller calculates the loop current I through Vrs and identifies the inkjet cartridge model according to the value range of I. This circuit is implemented only through an operational amplifier and a sampling resistor, and has strong compatibility. Specifically, the power supply VCC voltage is 5V, and the operational amplifier used is the RS358 general-purpose operational amplifier; the resistor Rs = 4.7Ω; a matching resistor Rf is set on the inkjet cartridge, and the matching resistor Rf values for different inkjet cartridge models (corresponding to different inkjet head accuracies: 300dpi, 600dpi, 1200dpi or different ink ratios 1, 2, 3) are 100Ω, 200Ω, and 500Ω respectively. When the inkjet cartridge is connected, the matching resistor Rf and the sampling resistor Rs form a loop; the operational amplifier detects the voltage difference Vrs across the sampling resistor Rs, amplifies it, and outputs it to the microcontroller, which then acquires VOUT; the loop current I is calculated as I = Vrs / 4.7Ω, preset threshold ranges are as follows: When the matching resistor Rf = 100Ω (300dpi), I ≈ 47.5mA (threshold range 44mA-51mA). After the op-amp gain is multiplied by 11, the microcontroller VOUT check range is (2.27V-2.63V); When the matching resistor Rf = 200Ω (600dpi), I ≈ 24.43mA (threshold range 22mA-26.5mA). After the op-amp gain is multiplied by 11, the microcontroller VOUT check range is (2.27V-2.63V). The OUT check range is 1.13V-1.37V. When the matching resistor Rf = 500Ω (1200dpi), I ≈ 9.91mA (threshold range 7.91mA-11.91mA). After the op-amp gain is 11 times, the microcontroller's VOUT check range is 0.40V-0.61V. The microcontroller determines the inkjet head accuracy and model of the inkjet cartridge based on the value range of I and outputs the identification result (controlling the inkjet head to spray ink according to the corresponding accuracy). In the op-amp current detection circuit, a resistor Rf is embedded in the ink cartridge consumable. One end of the resistor Rf is connected to the signal contact A, and the other end is connected to VCC. The contact on the circuit board is connected to the non-inverting op-amp terminal. Then, the ink cartridge contact and the circuit board contact cooperate with Rs and the op-amp chip to form an op-amp current detection circuit. Figure 1 , 2As shown in Figures 6 and 7, the device in Examples 1 and 2 has the following consumable detection method flow: S1: Device initialization, microcontroller and single-contact interface detection circuit are started, single-contact interface is in the ready-to-connect state, voltage divider detection circuit and operational amplifier current detection circuit are started (specifically, a single path detection can be selected according to the power consumption requirements of the inkjet equipment to reduce the energy consumption of the inkjet equipment). S2: Connect the inkjet cartridge to the single-contact interface, the contacts of the inkjet cartridge are connected to the single-contact interface of the device, and the matching resistor Rf of the inkjet cartridge is connected to the voltage divider detection circuit or the operational amplifier current detection circuit. Voltage divider detection circuit detection: The microcontroller collects the voltage Vout output by the voltage divider detection circuit through the ADC interface, records the value of Vout, and compares it with the preset voltage threshold range (different inks and different inkjet heads correspond to different Vout threshold ranges for low-priced inkjet cartridges). Operational amplifier current detection circuit detection: The microcontroller acquires the amplified voltage signal Vrs output by the operational amplifier, calculates the loop current I according to Vrs = I × Rs, records the value of I, and compares it with the preset current threshold range (different inks and different inkjet head precision low-priced inkjet cartridges correspond to different I threshold ranges). S3: Identification and judgment: If only the voltage divider detection circuit is used, when Vout is within a certain preset threshold range, it is determined to be the corresponding model of inkjet cartridge (clearly distinguishing the inkjet head model and ink); if only the operational amplifier current detection circuit is used, when I is within a certain preset threshold range, it is determined to be the corresponding model of inkjet cartridge; if both detection methods are used in combination, when both Vout and I are within the corresponding preset threshold range, it is determined to be the corresponding model of inkjet cartridge, improving the identification accuracy and avoiding misjudgment caused by poor contact of inkjet cartridge contacts or ink changes; if neither Vout nor I is within any preset threshold range, it is determined to be an unknown inkjet cartridge, a defective inkjet cartridge, or an incompatible inkjet cartridge. S4: After recognition is completed, the microcontroller outputs the recognition result (through the indicator lights and display screen of the inkjet device, or controls the inkjet head to work normally / stop working) to the signal input terminal of the inkjet printer to complete one inkjet cartridge recognition; if the inkjet cartridge is not connected, connected poorly, or the ink is exhausted (ink exhaustion will cause changes in contact impedance and trigger an abnormal threshold), the microcontroller will prompt an abnormality and wait for the inkjet cartridge to be connected again.
[0021] Figure 3As shown in Example 3: An identification device for consumables based on analog signal detection includes a dual-contact interface, a high-pass filter detection circuit, and the signal output terminal of the high-pass filter detection circuit is connected to the third ADC check port of the microcontroller via a wire. The signal input terminal of the high-pass filter detection circuit is connected to the first signal output terminal of the microcontroller via a wire. The high-pass filter detection circuit consists of a capacitor C1 and a resistor R3. One end of capacitor C1 is connected to contact A of the dual-contact interface, and the other end is connected to resistor R3 and the signal acquisition terminal of the microcontroller. The other end of resistor R3 is grounded. A matching capacitor Cf (different models and ink capacities of low-priced inkjet cartridges have different Cf capacities, covering commonly used low-priced capacitor specifications) is set between the two contacts of the inkjet cartridge (between the inkjet head and the ink tank or on a single component). Contact B is grounded. The microcontroller outputs a low-frequency signal AC (1) at a fixed frequency. The signal amplitude (00Hz-1kHz, generated by the microcontroller itself without the need for an additional signal generator) is sent to contact A. After passing through a high-pass filter detection word circuit, the microcontroller acquires the amplitude of the filtered signal. Due to the different capacitive reactances of different matching capacitors Cf, the amplitude of the filtered signal varies. The microcontroller accurately identifies the model of the inkjet cartridge by judging the range of the signal amplitude. Among them, capacitor C1 is a low-cost ceramic capacitor of 10nF-10μF, and resistor R3 is a resistor of 1k-100kΩ, which is adapted to the signal transmission characteristics of the inkjet cartridge. Figure 3 In the circuit, AC is a 5V 100Hz sine wave output by the microcontroller. In the high-pass filter detection circuit, capacitor C1 = 1μF and resistor R3 = 10kΩ. Different inkjet cartridge models (corresponding to different ink types: black and color) have different matching capacitors Cf: Model 1 (black ink / printhead model 1): Cf = 10nF; Model 2 (color ink / printhead model 2): Cf = 100nF; Model 3 (high-capacity color ink / printhead model 3): Cf = 1μF. With Cf = 10nF, the ADC sampling amplitude is approximately 0.3V; with Cf = 100nF, the ADC sampling amplitude is approximately 2.8V; and with Cf = 1μF, the ADC sampling amplitude is approximately 4.7V. The microcontroller determines the printhead model of the inkjet cartridge based on the ADC amplitude range and outputs the identification result (controlling the printhead adjustment logic). In the high-pass filter detection circuit, a capacitor is embedded in the ink cartridge consumable and electrically connected to the circuit board through contacts to form a complete high-pass filter detection circuit.
[0022] Figure 4As shown in Example 4: An identification device for consumables based on analog signal detection includes a dual-contact interface and a low-pass filter detection circuit. The signal output terminal of the low-pass filter detection circuit is connected to the fourth ADC check port of the microcontroller via a wire. The signal input terminal of the low-pass filter detection circuit is connected to the second signal output terminal of the microcontroller via a wire. The low-pass filter detection circuit consists of a resistor R4 and a capacitor C2. One end of resistor R4 is connected to contact A of the dual-contact interface, and the other end is connected to capacitor C2 and the signal acquisition terminal of the microcontroller. The other end of capacitor C2 is grounded. A matching resistor is provided between the two contacts of the inkjet cartridge. (Different models of inkjet cartridges) Different resistance values are used to adapt to the resistance characteristics of different inkjet heads; contact B is grounded; the microcontroller outputs a fixed-frequency sinusoidal signal AC (1kHz-10kHz, generated by the microcontroller itself) to contact A, and after passing through a low-pass filter detection circuit, the microcontroller acquires the amplitude of the filtered signal; different resistance values... Different impedance matching with the filter circuit results in different output signal amplitudes. The microcontroller identifies the inkjet cartridge model through the signal amplitude (which can distinguish between low-cost inkjet cartridges of different inks and compatible models); resistor R4 is a low-cost resistor of 1k-100kΩ, and capacitor C2 is a low-cost ceramic capacitor of 10nF-10μF. Figure 4 In the diagram, AC represents a 5V 10kHz sine wave output from the microcontroller. The low-pass filter circuit includes capacitor C2 = 1μF and resistor R4 = 10kΩ. Different inkjet cartridge models require different resistors. Model 1 (Black ink / printhead model 1) =1kΩ, Model 2 (Color Ink / Printhead Model 2): =2kΩ, Model 3 (High-capacity color ink / printhead model 3): =5kΩ. =1kΩ, ADC sampling amplitude ≈0.3V, =2kΩ, ADC sampling amplitude ≈0.6V, =5kΩ, ADC sampling amplitude≈1.1V, the microcontroller determines the inkjet head model of the inkjet cartridge based on the ADC amplitude range and outputs the identification result. In the low-pass filter detection circuit, a resistor is embedded in the ink cartridge consumable, which is electrically connected to the circuit board through contacts to form a complete low-pass filter detection circuit.
[0023] Figure 5As shown in Example 5: An identification device for consumables based on analog signal detection includes a dual-contact interface and a bandpass filter detection circuit. The signal output terminal of the bandpass filter detection circuit is connected to the fifth ADC check port of the microcontroller via a wire. The signal input terminal of the bandpass filter detection circuit is connected to the third signal output terminal of the microcontroller via a wire. The bandpass filter circuit consists of two resistors (R5, R6) and two capacitors (C3, C4), forming a second-order RC bandpass filter detection circuit. One end of resistor R5 is connected to contact A of the dual-contact interface, and the other end is connected to capacitor C3 and resistor R6. The other end of capacitor C3 is grounded. The other end of resistor R6 is connected to capacitor C4 and the signal acquisition terminal of the microcontroller. The other end of capacitor C4 is grounded. A matching RC series structure is set between the two contacts of the inkjet cartridge. Different models of inkjet cartridges resistance, Different inkjet cartridges have different capacities, corresponding to different inkjet head precision and ink characteristics. Contact B is grounded. The microcontroller outputs a sinusoidal signal AC covering the bandpass filter frequency band (500Hz-5kHz) to contact A. The bandpass filter detection circuit only allows signals of specific frequencies to pass through. The series RC structure of different inkjet cartridges will change the center frequency and output amplitude of the bandpass filter detection circuit. The microcontroller accurately identifies the inkjet cartridge model by detecting the center frequency and amplitude of the output signal. Figure 5 In the diagram, AC is a 5V 2kHz sine wave output from the microcontroller. In the bandpass filter detection circuit: resistors R5 and R6 = 10kΩ, capacitors C3 and C4 = 10nF. Different inkjet cartridge models correspond to different... , Model 1 (Black ink / printhead model 1) =1kΩ, =10nF, Model 2 (Color Ink / Printhead Model 2): =2kΩ, =100nF, Model 3 (High-capacity color ink / printhead model 3): =5kΩ, =1μF. =1kΩ, =10nF, ADC sampling amplitude ≈1.8V; =2kΩ, =100nF, ADC sampling amplitude ≈3.2V; =5kΩ, =1μF, ADC sampling amplitude ≈4.1V, the microcontroller determines the inkjet head model of the inkjet cartridge based on the ADC amplitude range and outputs the identification result. In the bandpass filter circuit, the ink cartridge consumable embeds one resistor and one capacitor, which are electrically connected to the circuit board through contacts to form a complete low-pass filter detection circuit.
[0024] Figure 3, 4 As shown in Figures 5, 6, and 8, the device in Examples 3, 4, and 5 has the following consumable testing method flow: S1: Device initialization, microcontroller and dual-contact interface detection circuit are started, dual-contact interface is in a ready-to-connect state, high-pass filter detection circuit, low-pass filter detection circuit, and band-pass filter detection circuit are started according to the needs of inkjet equipment. S2: Connect inkjet cartridge to dual-contact interface, the two contacts of inkjet cartridge are connected to contacts A and B of device respectively, and the matching element of inkjet cartridge ( ) Connect to the corresponding filter detection circuit. High-pass filter detection circuit detection: (1) The microcontroller outputs a fixed frequency low-frequency AC signal (100Hz-1kHz) to contact A; (2) After the AC signal passes through the high-pass filter detection circuit, the microcontroller collects the amplitude of the filtered signal through the ADC interface; (3) The collected signal amplitude is compared with the preset amplitude threshold range (different printhead models and different ink low-priced inkjet cartridges have different amplitude threshold ranges, fully covering the capacitance characteristics of all low-priced inkjet cartridges), and the printhead model and ink are determined. Low-pass filter detection circuit detection: (1) The microcontroller outputs a fixed frequency high-frequency AC signal (1kHz-10kHz) to contact A; (2) After the AC signal passes through the low-pass filter detection circuit, the microcontroller collects the amplitude of the filtered signal; (3) The collected signal amplitude is compared with the preset amplitude threshold range (different printhead models and different ink low-priced inkjet cartridges have different amplitude threshold ranges, fully covering the capacitance characteristics of all low-priced inkjet cartridges), and the printhead model and ink are determined. (Corresponding to different amplitude threshold ranges), determine the inkjet head model and ink. Bandpass filter detection circuit detection: (1) The microcontroller outputs an AC signal covering the 500Hz-5kHz frequency band to contact A; (2) After the AC signal passes through the bandpass filter detection circuit, the microcontroller collects the filtered signal and analyzes the center frequency and amplitude of the signal; (3) The center frequency and amplitude are compared with the preset threshold range (for different inkjet head models). For different amplitude threshold ranges, it can distinguish low-priced inkjet cartridges of different ink types and different printheads, and determine the printhead model and ink. S3: After identification, the microcontroller outputs the identification result (controlling the printhead to spray ink normally, using the correct ink control logic, etc.). If the detection result does not match any preset threshold, it is determined to be an unknown inkjet cartridge, an unqualified inkjet cartridge, or an incompatible inkjet cartridge. If the inkjet cartridge is not connected, is poorly connected, or the printhead is damaged, the microcontroller prompts an abnormality and waits for the inkjet cartridge to be connected again.
[0025] Figure 1 , 2In steps 3, 4, 5, 6, 7, and 8, the preset threshold range setting during production is as follows: For all commonly used low-cost inkjet cartridges (pre-testing of analog signal parameters (voltage, current, signal amplitude, center frequency) corresponding to different models, printheads, inks, and ink types of inkjet cartridges), a complete threshold range database is established and stored in the Flash memory of the main control module, eliminating the need for additional storage chips and reducing costs; the threshold range can be adjusted via serial port or simple buttons to adapt to different batches of inkjet cartridges (avoiding recognition deviations caused by printhead production errors and ink batch differences). Selection of inkjet cartridge matching components: Matching components on all inkjet cartridges (… All components are selected from the most common available on the market, reducing the production cost of the inkjet cartridges. Matching components can be placed on the printhead or ink tank without affecting the normal inkjet function of the cartridge. Anti-interference design: Low-cost filter capacitors (such as 0.1μF ceramic capacitors) are added to all detection circuits to suppress electromagnetic interference and signal interference generated by ink flow during inkjet equipment operation, ensuring the stability of the detection signal. This eliminates the need for complex anti-interference circuits, balancing cost and stability, and adapting to the working environment of inkjet equipment. Compatibility design: The device's contact interface is compatible with low-cost inkjet cartridges of different sizes and pin definitions (adapting to different brands and models of inkjet equipment). Through simple interface adaptation (such as replaceable interface plugs), it can identify various low-cost inkjet cartridges.
[0026] Figure 1 , 2 As shown in 3, 4, 5, 6, 7, and 8, through the above, the present invention achieves the advantages of low cost, strong adaptability, comprehensive solutions, and simple structure. It can be directly integrated into the motherboard of inkjet equipment without occupying additional space; it is compatible with various low-priced inkjet equipment without requiring major modifications to the equipment, has low promotion difficulty, and can quickly occupy the low-priced inkjet equipment and inkjet cartridge market.
[0027] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention.
Claims
1. A method for identifying consumables based on analog signal detection, characterized in that, The process includes the following steps: S1: The main control module starts up, selects the corresponding contact interface according to the inkjet cartridge to be tested, and starts the detection circuit that matches the contact interface. S2: Connect the inkjet cartridge to the contact interface, connect the inkjet cartridge contacts to the contact interface, and connect the matching element built into the inkjet cartridge to the corresponding detection circuit. S3: The detection circuit detects the analog characteristics of the matching element and outputs the corresponding analog detection signal to the main control module; S4: The main control module compares the collected detection signal with the preset threshold. When the detection signal falls within the corresponding preset threshold range, it is determined to be a compatible inkjet cartridge. When the detection signal is not within the preset threshold range, it is determined to be an incompatible inkjet cartridge. S5: After the detection is completed, the main control module outputs the recognition result to the inkjet printer; If the inkjet cartridge is determined to be incompatible, or if it is not connected or has a poor connection, an error message will be triggered and the system will wait for connection again.
2. The method for identifying consumables based on analog signal detection according to claim 1, characterized in that, The contact interface in step S1 is configured as a single contact interface and / or a double contact interface. The detection circuit includes one or more of the following: a voltage divider detection circuit and an operational amplifier current detection circuit matched with the single contact interface; and / or one or more of the following: a high-pass filter detection circuit, a low-pass filter detection circuit, and a band-pass filter detection circuit matched with the double contact interface.
3. The method for identifying consumables based on analog signal detection according to claim 2, characterized in that, When the contact interface in step S1 is a single contact interface, the voltage divider detection circuit and / or the operational amplifier current detection circuit are activated. In step S2, the inkjet cartridge matching component is a resistor. In step S3, the voltage divider detection circuit outputs the voltage signal after voltage division, the operational amplifier current detection circuit outputs the amplified voltage signal, and the main control module calculates the loop current. In step S4, the preset threshold is a voltage threshold and / or a current threshold.
4. The method for identifying consumables based on analog signal detection according to claim 2, characterized in that, In step S1, the contact interface is a dual-contact interface, and one or more of the high-pass filter detection circuit, low-pass filter detection circuit, and band-pass filter detection circuit are activated. In step S2, the inkjet cartridge matching element is one or more of the following: capacitor, resistor, or capacitor and resistor in series. In step S3, the high-pass filter detection circuit and low-pass filter detection circuit output the filtered signal amplitude, and the band-pass filter detection circuit outputs the filtered signal amplitude and center frequency. In step S4, the preset threshold is the signal amplitude threshold and / or the signal amplitude threshold and center frequency threshold.
5. The method for identifying consumables based on analog signal detection according to claim 2, characterized in that, The detection circuit supports individual or combined startup: when the voltage divider detection circuit and the operational amplifier current detection circuit are started simultaneously, the detection signals of both circuits must fall within the corresponding threshold range to be determined as compatible with the inkjet cartridge; when two or more of the high-pass filter detection circuit, low-pass filter detection circuit, and band-pass filter detection circuit are started simultaneously, the detection signals of each circuit must fall within the corresponding threshold range to be determined as compatible with the inkjet cartridge.
6. A device for identifying consumables based on analog signal detection, used to implement the identification method according to any one of claims 1-5, characterized in that, The device is integrated on a circuit board and includes a power module, a main control module, an analog signal detection module, and a contact interface module. The power module supplies power to the device. The main control module uses a microcontroller. The contact interface module is configured as a single-contact interface and / or a dual-contact interface. The contact interface module is connected to the contacts of the inkjet cartridge to be tested, and also to the analog signal detection module. The analog signal detection module is electrically connected to the contact interface module and the main control module, respectively. The analog signal detection module includes a voltage divider detection circuit, an operational amplifier current detection circuit, a high-pass filter detection circuit, a low-pass filter detection circuit, and a band-pass filter detection circuit.
7. The identification device for detecting consumables based on analog signals according to claim 6, characterized in that, The voltage divider detection circuit includes two resistors that are electrically connected.
8. The identification device for detecting consumables based on analog signals according to claim 6, characterized in that, The op-amp current detection circuit includes multiple electrically connected resistors and an op-amp.
9. The identification device for detecting consumables based on analog signals according to claim 6, characterized in that, Both the high-pass filter detection circuit and the low-pass filter detection circuit include an electrically connected resistor and a capacitor, respectively.
10. The identification device for detecting consumables based on analog signals according to claim 6, characterized in that, The bandpass filter detection circuit includes two resistors and two capacitors electrically connected.