An inkjet control circuit, an inkjet control circuit board, and an inkjet head

Abstract

The application belongs to the technical field of inkjet printing, and discloses an inkjet control circuit, an inkjet control circuit board and an inkjet head. The inkjet control circuit comprises a square wave signal generation module, a control module and an enable signal sending module which are electrically connected in sequence. The square wave signal generation module is used for delivering a square wave signal when the inkjet control circuit is powered on. The control module is used for delivering the square wave signal to the enable signal sending module when it is detected that the voltage of the square wave signal is greater than a preset conduction threshold. The enable signal sending module is used for sending an enable signal after receiving the square wave signal. The inkjet control circuit, the inkjet control circuit board and the inkjet head of the application deliver stable square wave signals through the control module, prevent the false triggering of the enable signal in the power-on process, and improve the inkjet stability.

Description

Technical Field

[0001] This utility model belongs to the technical field of inkjet printing, and specifically relates to an inkjet control circuit, an inkjet control circuit board, and an inkjet head. Background Technology

[0002] In digital inkjet printing systems, circuit boards control the operation of the printhead, with enable signals responsible for starting or stopping the inkjet process. However, during power-on or power-off cycles, the power supply voltage is unstable, experiencing rises or falls, causing the control circuit to enter an uncertain state before the voltage reaches a stable level. This instability can trigger false triggering of the enable signal, such as generating brief pulses, causing the printhead to operate at an incorrect time. False triggering results in inkjet operation activating at unexpected moments, severely impacting print quality (e.g., uneven ink distribution or image distortion) and potentially causing physical damage to the printhead or other hardware components. Current technology lacks an effective mechanism to reliably prevent false triggering during power-on, necessitating improvements to enhance system stability and reliability.

[0003] Therefore, existing technologies need to be improved and developed. Utility Model Content

[0004] The purpose of this application is to provide an inkjet control circuit, an inkjet control circuit board, and an inkjet head. Through a square wave signal generation module, a control module, and an enable signal transmission module that are electrically connected in sequence, an enable signal is sent when the voltage of the square wave signal is greater than a preset conduction threshold, which effectively prevents false triggering during power-on and improves the stability of print quality and hardware reliability.

[0005] In a first aspect, this application provides an inkjet control circuit, including a square wave signal generating module, a control module, and an enable signal transmitting module that are electrically connected in sequence. The square wave signal generation module is used to transmit a square wave signal when the inkjet control circuit is powered on. The control module is used to transmit the square wave signal to the enable signal sending module when the voltage of the square wave signal is detected to be greater than a preset conduction threshold. The enable signal sending module is used to send an enable signal after receiving the square wave signal.

[0006] This application provides an inkjet control circuit that, through a square wave signal generation module, a control module, and an enable signal transmission module connected in sequence, sends an enable signal when the voltage of the square wave signal is greater than a preset conduction threshold, effectively preventing false triggering during power-on and improving print quality stability and hardware reliability.

[0007] Optionally, the control module includes a switching transistor and a filter capacitor.

[0008] Optionally, the switching transistor is an NPN transistor; the switching transistor is provided with a base, a generator electrode, and a collector electrode; the generator electrode is grounded.

[0009] This application provides an inkjet control circuit that, by setting the switching transistor to an NPN transistor, keeps the switching transistor off until the voltage reaches a stable level when the control circuit is powered on or off, thus preventing erroneous signals from being transmitted to subsequent modules.

[0010] Optionally, the filter capacitor is connected between the generator and collector of the switching transistor.

[0011] Optionally, the square wave signal generation module includes a square wave signal processor, a first resistor, a first capacitor, and a second resistor; the first end of the first resistor and the first end of the first capacitor are both connected to the square wave signal processor, the first end of the second resistor is grounded, and the second ends of the first resistor, the first capacitor, and the second resistor are all connected to the base of the switching transistor of the control module.

[0012] Optionally, the enable signal transmitting module includes an enable signal processor; the enable signal processor is electrically connected to the collector of the switching transistor of the control module.

[0013] Optionally, the inkjet control circuit further includes a fuse module; the fuse module is connected to the collector of the switching transistor of the control module; The safety module is used to suppress the output of the enable signal by the enable signal sending module when the switching transistor of the control module is cut off.

[0014] This application provides an inkjet control circuit that, by setting a fuse module at one end of the collector of the switching transistor in the control module, can absorb transient pulses that may be generated when the power supply voltage is unstable during power-on or power-off. This prevents the pulses from being transmitted to the enable signal transmission module, thereby preventing the enable signal from being mistakenly sent before the circuit reaches a stable state.

[0015] Optionally, the fuse module includes a third resistor and a fuse signal processor that are electrically connected; the first end of the third resistor is connected to the fuse signal processor, and the second end of the third resistor is electrically connected to the collector of the switching transistor of the control module.

[0016] Secondly, this application provides an inkjet control circuit board, including the inkjet control circuit, PCB board and control chip described above; the inkjet control circuit and the control chip are disposed on the PCB board, and the square wave signal generation module of the inkjet control circuit and the control chip are electrically connected.

[0017] Thirdly, this application provides an inkjet head, including the inkjet control circuit board and nozzle described above; the enable signal transmission module of the inkjet control circuit board and the nozzle are electrically connected.

[0018] As can be seen from the above, the inkjet control circuit, inkjet control circuit board and inkjet head of this utility model, through the square wave signal generation module, control module and enable signal transmission module connected in sequence, send an enable signal when the voltage of the square wave signal is greater than the preset conduction threshold, effectively preventing false triggering during the power-on process and improving the stability of printing quality and hardware reliability.

[0019] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a circuit diagram of an inkjet control circuit provided in an embodiment of this application.

[0021] Figure 2 This is a schematic diagram of the structure of an inkjet control circuit board provided in an embodiment of this application.

[0022] Figure 3 This is a circuit diagram of an inkjet head provided in an embodiment of this application.

[0023] Labeling Explanation: 1. Square wave signal generation module; 2. Control module; 3. Enable signal transmission module; 4. Switching transistor; 5. Filter capacitor; 6. Square wave signal processor; 7. First resistor; 8. First capacitor; 9. Second resistor; 10. Enable signal processor; 11. Fuse module; 12. Third resistor; 13. Fuse signal processor; 14. PCB board; 15. Control chip; 16. Nozzle. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] The following disclosure provides many different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0026] like Figure 1 As shown, an inkjet control circuit of this utility model includes a square wave signal generating module 1, a control module 2, and an enable signal transmitting module 3 connected in sequence. The square wave signal generation module 1 is used to transmit a square wave signal when the inkjet control circuit is powered on; The control module 2 is used to send the square wave signal to the enable signal sending module 3 when the voltage of the detected square wave signal is greater than the preset conduction threshold. The enable signal sending module 3 is used to send an enable signal after receiving a square wave signal.

[0027] In practical applications, after the inkjet control circuit is powered on, the square wave signal generation module 1 immediately outputs a square wave signal. The control module 2 continuously monitors this signal. When the voltage of the square wave signal exceeds a preset conduction threshold (which can be set according to actual needs), it indicates that the circuit is operating stably. Subsequently, the control module 2 transmits the square wave signal to the enable signal sending module 3. The enable signal sending module 3 responds to the signal input and sends an enable signal. Thus, the printhead only starts after the circuit has stabilized, avoiding false triggering caused by voltage fluctuations during the initial power-on period.

[0028] This application provides an inkjet control circuit that, through a square wave signal generation module, a control module, and an enable signal transmission module connected in sequence, sends an enable signal when the voltage of the square wave signal is greater than a preset conduction threshold, effectively preventing false triggering during power-on and improving print quality stability and hardware reliability.

[0029] Specifically, the control module 2 includes a switching transistor 4 and a filter capacitor 5.

[0030] In practical applications, the control module 2 uses a combination of switching transistor 4 and filter capacitor 5. When the ink path control circuit is powered on or off, the switching transistor 4 remains off until the voltage reaches a stable level, preventing erroneous signals from being transmitted to subsequent modules. The filter capacitor 5 is connected to the circuit to absorb instantaneous changes in voltage fluctuations, smooth the power waveform, and ensure that the control module 2 does not detect false signal changes during voltage rise or fall, thereby eliminating the risk of malfunction.

[0031] Specifically, the switching transistor 4 is an NPN transistor; the switching transistor 4 is provided with a base, a generator electrode and a collector electrode; the generator electrode is grounded.

[0032] In practical applications, during the power-on or power-off process of the inkjet control circuit, the power supply voltage may be unstable. The square wave signal is input to switch 4 through the base. When the square wave signal is not stable (i.e., the voltage is less than or equal to the preset conduction threshold), switch 4 remains in the off state. The collector only conducts and outputs the square wave signal after the square wave signal stabilizes, thereby isolating noise interference during the power rise or fall phase and preventing false triggering of the enable signal. The collector is grounded to prevent electrostatic damage and ensure normal circuit operation.

[0033] Specifically, the filter capacitor 5 is connected between the generator and collector of the switching transistor 4.

[0034] In practical applications, filter capacitor 5 refers to a capacitor element used to filter noise in the signal, which can be implemented using a ceramic capacitor or an electrolytic capacitor. By connecting filter capacitor 5 between the generator and collector of switching transistor 4, after the square wave signal stabilizes, the collector conducts and outputs a square wave signal. The square wave signal is filtered by filter capacitor 5, smoothing out voltage fluctuations in the square wave signal.

[0035] Specifically, the square wave signal generation module 1 includes a square wave signal processor 6, a first resistor 7, a first capacitor 8, and a second resistor 9; the first end of the first resistor 7 and the first end of the first capacitor 8 are both connected to the square wave signal processor 6, the first end of the second resistor 9 is grounded, and the second ends of the first resistor 7, the first capacitor 8, and the second resistor 9 are all connected to the base of the switching transistor 4 of the control module 2.

[0036] In practical applications, the square wave signal processor 6 generates the original square wave signal, which can be implemented using a microcontroller or a dedicated integrated circuit. The first terminal of the first resistor 7 and the first terminal of the first capacitor 8 are both connected to the square wave signal processor 6, forming a filter network in parallel with the first capacitor 8 to filter out high-frequency noise and smooth the waveform. The second terminals of the first resistor 7, the first capacitor 8, and the second resistor 9 are all connected to the base of the switching transistor 4. The second resistor 9 is grounded to establish a stable reference potential. The resistance values ​​of the first resistor 7 and the second resistor 9 can be set according to actual needs.

[0037] Specifically, the enable signal transmitting module 3 includes an enable signal processor 10; the enable signal processor 10 is electrically connected to the collector of the switching transistor 4 of the control module 2.

[0038] In practical applications, the enable signal processor 10 can issue an enable signal, which can be implemented using a microcontroller or an application-specific integrated circuit. After the square wave signal stabilizes and turns on the collector, the enable signal processor 10 receives the square wave signal filtered by the filter capacitor 5 and issues an enable signal; this avoids the transmission of brief pulse signals caused by power instability to the nozzle, preventing false triggering.

[0039] Specifically, the inkjet control circuit also includes a fuse module 11; the fuse module 11 is connected to the collector of the switching transistor 4 of the control module 2. The safety module 11 is used to suppress the output of the enable signal from the enable signal sending module 3 when the switch 4 of the control module 2 is cut off.

[0040] In specific applications, the protection module 11 is located at one end of the collector of the switching transistor 4 of the control module 2. It is used to suppress the output of the enable signal by the enable signal sending module 3 when the switching transistor 4 of the control module 2 is cut off. It can provide a buffer in the signal transmission path and work with the control module 2 to play a dual protection role.

[0041] Specifically, the fuse module 11 includes a third resistor 12 and a fuse signal processor 13 that are electrically connected; the first end of the third resistor 12 is connected to the fuse signal processor 13, and the second end of the third resistor 12 is electrically connected to the collector of the switching transistor 4 of the control module 2.

[0042] In practical applications, the fuse signal processor 13 is an integrated circuit that performs logic control on the enable signal. It can be implemented using a microcontroller unit or a dedicated logic chip. The fuse signal processor 13 monitors circuit stability in real time. When the circuit is powered on or off, if the square wave signal generation module 1 fails to stably transmit the square wave signal (i.e., the square wave signal is less than or equal to the preset conduction threshold), the transmitting electrode of the switch transistor 4 in the control module 2 is cut off. The inkjet control circuit voltage does not reach the operating threshold, and the fuse signal processor 13 blocks the signal path to suppress the enable signal transmission module 3 from outputting the enable signal. When the voltage of the square wave signal output by the square wave signal generation module 1 exceeds the preset conduction threshold (i.e., stably transmits the square wave signal), the transmitting electrode of the switch transistor 4 in the control module 2 is turned on. The square wave signal flows into the enable signal transmission module 3 and the fuse signal processor 13, causing the inkjet control circuit voltage to reach the operating threshold. The fuse signal processor 13 no longer suppresses the enable signal transmission module 3, and the enable signal transmission module 3, upon receiving the square wave signal, sends an enable signal to drive the printhead to operate normally.

[0043] like Figure 2 As shown, Figure 2This is a schematic diagram of an inkjet control circuit board provided in an embodiment of this application. The inkjet control circuit board includes the inkjet control circuit described above, a PCB board 14, and a control chip 15. The inkjet control circuit and the control chip 15 are disposed on the PCB board 14, and the square wave signal generation module 1 of the inkjet control circuit and the control chip 15 are electrically connected. The PCB board 14 is used to fix the position of the inkjet control circuit and the control chip 15, and the control chip 15 is used to drive the inkjet control circuit. When a current signal enters the inkjet control circuit board, the control chip 15 first receives the current signal. In response to the current signal, the control chip 15 drives the inkjet control circuit to operate. The square wave signal generation module 1 in the inkjet control circuit is activated and begins to send a square wave signal. When the square wave signal stabilizes (i.e., the voltage of the square wave signal is greater than the preset conduction threshold), the generating electrode of the switching transistor 4 of the control module 2 is turned on, and the square wave signal is sent to the enable signal sending module 3. After receiving the square wave signal, the enable signal sending module 3 sends an enable signal. The enable signal can drive the printhead to work normally, thereby effectively preventing false triggering during the power-on process and improving print quality.

[0044] like Figure 3 As shown, Figure 3 This is a circuit diagram of an inkjet head provided in an embodiment of this application. The inkjet head includes the inkjet control circuit board and nozzle 16 described above. The enable signal transmitting module 3 of the inkjet control circuit board and the nozzle 16 are electrically connected. The nozzle 16 is connected to the ink pump and the ink tank via ink tubes. Figure 3 (The ink tube, ink pump, and ink tank are not shown in the diagram.) Nozzle 16 is used to output ink. The ink pump extracts ink from the ink tank through the ink tube and delivers it to nozzle 16 through the ink tube. When a current signal enters the inkjet head, it first passes through the inkjet control circuit board. The control chip 15 in the inkjet control circuit board responds to the current signal and drives the inkjet control circuit to operate. The square wave signal generation module 1 in the inkjet control circuit is activated and begins to send a square wave signal. When the square wave signal stabilizes (i.e., the voltage of the square wave signal is greater than the preset conduction threshold), the generating electrode of the switching transistor 4 of the control module 2 is turned on, and the square wave signal is sent to the enable signal transmission module 3. After receiving the square wave signal, the enable signal transmission module 3 sends an enable signal, which is sent to nozzle 16, causing nozzle 16 to start outputting ink. This effectively prevents false triggering during the power-on process and improves the printing quality stability of the inkjet head.

[0045] This technical solution uses a square wave signal generation module, a control module, and an enable signal transmission module that are electrically connected in sequence. When the voltage of the square wave signal is greater than a preset conduction threshold, an enable signal is sent, which effectively prevents false triggering during power-on and improves the stability of printing quality and hardware reliability.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. An inkjet control circuit, characterized in that, It includes a square wave signal generation module (1), a control module (2), and an enable signal transmission module (3) that are connected in sequence. The square wave signal generation module (1) is used to transmit a square wave signal when the inkjet control circuit is powered on; The control module (2) is used to transmit the square wave signal to the enable signal sending module (3) when the voltage of the square wave signal is detected to be greater than the preset conduction threshold. The enable signal sending module (3) is used to send an enable signal after receiving the square wave signal.

2. The inkjet control circuit according to claim 1, characterized in that, The control module (2) includes a switching transistor (4) and a filter capacitor (5).

3. The inkjet control circuit according to claim 2, characterized in that, The switching transistor (4) is an NPN transistor; the switching transistor (4) is provided with a base, a generator electrode and a collector electrode; the generator electrode is grounded.

4. The inkjet control circuit according to claim 3, characterized in that, The filter capacitor (5) is connected between the generator electrode and the collector electrode of the switching transistor (4).

5. The inkjet control circuit according to claim 4, characterized in that, The square wave signal generation module (1) includes a square wave signal processor (6), a first resistor (7), a first capacitor (8), and a second resistor (9); the first end of the first resistor (7) and the first end of the first capacitor (8) are both connected to the square wave signal processor (6), the first end of the second resistor (9) is grounded, and the second end of the first resistor (7), the second end of the first capacitor (8), and the second end of the second resistor (9) are all connected to the base of the switching transistor (4) of the control module (2).

6. The inkjet control circuit according to claim 5, characterized in that, The enable signal transmitting module (3) includes an enable signal processor (10); the enable signal processor (10) is electrically connected to the collector of the switching transistor (4) of the control module.

7. The inkjet control circuit according to claim 6, characterized in that, The inkjet control circuit also includes a fuse module (11); the fuse module (11) is connected to the switching transistor (4) of the control module (2); The insurance module (11) is used to suppress the output of the enable signal by the enable signal sending module (3) when the switch tube (4) of the control module (2) is cut off.

8. The inkjet control circuit according to claim 7, characterized in that, The fuse module (11) includes a third resistor (12) and a fuse signal processor (13) that are electrically connected; the first end of the third resistor (12) is connected to the fuse signal processor (13), and the second end of the third resistor (12) is electrically connected to the collector of the switching transistor (4) of the control module (2).

9. An inkjet control circuit board, characterized in that, It includes the inkjet control circuit, PCB board (14) and control chip (15) as described in any one of claims 1-8; the inkjet control circuit and the control chip (15) are disposed on the PCB board (14), and the square wave signal generation module (1) of the inkjet control circuit and the control chip (15) are electrically connected.

10. An inkjet head, characterized in that, It includes the inkjet control circuit board and nozzle (16) as described in claim 9; the enable signal sending module (3) of the inkjet control circuit board and the nozzle (16) are electrically connected.

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