The interface circuit of the nozzle

Abstract

The present invention relates to an interface circuit of a printhead. The interface circuit of the printhead at least includes the interface circuit of the printhead provided by the embodiments of the present invention. The interface circuit of the printhead at least includes a headboard connection circuit, a first printhead connection circuit, and a second printhead connection circuit. The headboard connection circuit is respectively connected to the headboard and the first printhead connection circuit. The first printhead connection circuit is connected to the printhead through the second printhead connection circuit. In the embodiments of the present invention, a serializer / deserializer circuit is provided between the headboard and the printhead, and a DVI-I interface and a standard cable are used for connection therebetween. At the same time, the headboard can be moved out of the existing printhead to the main control box, so that the size of the printhead is reduced, the printhead and the ink supply system can be efficiently maintained, and even the overall replacement of the printhead becomes a reasonable choice for customers, thereby greatly improving the reliability and production efficiency of the whole machine.

Description

Technical Field

[0001] The present invention relates to the field of circuit technologies, and particularly to an interface circuit for a print head. Background Art

[0002] In recent years, the digital printing industry has developed rapidly, and the market shares of digital printing at home and abroad have shown a significant upward trend. Among them, the inkjet technology has become the most potential technical direction in the development of digital printing due to its unique technical characteristics.

[0003] The print heads used in the inkjet technology can be classified into the following four types according to different driving methods: thermal bubble driving type, piezoelectric driving type, electrostatic driving type, and acoustic wave driving type. Among them, the piezoelectric drop-on-demand print head is adopted by many digital printing devices due to its advantages such as long service life and the ability to adapt to various inks. The working principle of the piezoelectric driving type is to apply a voltage to the piezoelectric ceramic element, and the ceramic element will undergo corresponding deformation, thereby pushing the ink in the nozzle tube. When the pressure generated instantaneously is sufficient to overcome the surface tension of the liquid, the ink will be ejected from the nozzle. During the ejection of the ink droplet, the driving voltage is removed, causing the piezoelectric ceramic element to deform in the opposite direction. At this time, the ink droplet undergoes a necking phenomenon, resulting in the detachment of the ink droplet from the nozzle.

[0004] The print head board of the single-board architecture refers to integrating the control and driving of the print head, such as data communication and synchronous signal interface, on a single head board. The integration of control and driving and the convenient and flexible multi-head board topology make the print head board of the single-board architecture widely used in the single-PASS industrial field.

[0005] The design of the print head of digital printing is a factor that must be considered in printing equipment. In the prior art, a closed integrated print head design is adopted, that is, the print head, the print head board, and the ink supply system are integrated in a single print head. Among them: for a single-print head single-machine print head, as Figure 1 shown, the ink supply system is often designed as an independent siphon ink sac or a negative pressure controlled ink cartridge; for a multi-print head print head, as Figure 2 shown, the ink supply system is often designed as a negative pressure controlled secondary ink cartridge. At the same time, each print head board needs to be directly connected to the print head through a specified cable according to the connector model specified by the print head manufacturer.

[0006] Existing head designs all adopt a "closed integrated" design that integrates the print head, the print head board, and the ink supply system within a single head. However, since the print head board inside the head has functions such as receiving print head data and synchronization signals, controlling and driving the print head, the size of the board is relatively large, which makes it impossible to reduce the size of the head accordingly. Additionally, when a failure occurs in the print head, the print head board, or the ink supply system, for an integrated design head, either the entire head needs to be disassembled, resulting in cumbersome head maintenance and low efficiency, or the entire head needs to be replaced, increasing the customer's maintenance cost. In short, the disadvantages such as the inability to miniaturize the head, low maintenance efficiency, and high replacement cost are particularly obvious for a single-print-head stand-alone head. Summary of the Invention

[0007] The present invention aims to provide an interface circuit for a print head to address the deficiencies in the prior art, and the technical problems to be solved by the present invention are achieved through the following technical solutions.

[0008] In a first aspect, an embodiment of the present invention provides an interface circuit for a print head. The interface circuit of the print head at least includes a head board connection circuit, a first print head connection circuit, and a second print head connection circuit. The head board connection circuit is respectively connected to the head board and the first print head connection circuit, and the first print head connection circuit is connected to the print head through the second print head connection circuit.

[0009] Among them, the head board connection circuit includes a serial transmission control module and a first interface.

[0010] The first print head connection circuit includes a first interface, a second interface, and a third interface.

[0011] The second print head connection circuit includes a deserialization reception control module, a linear power supply control module, a second interface, a third interface, a fourth interface, and a fifth interface. Among them, the deserialization reception control module is respectively connected to the linear power supply control module, the second interface, the third interface, the fourth interface, and the fifth interface.

[0012] The first interface of the head board connection circuit is connected to the first interface of the first print head connection circuit.

[0013] The second interface and the third interface of the first print head connection circuit are respectively connected to the second interface and the third interface of the second print head connection circuit.

[0014] The fourth interface and the fifth interface of the second print head connection circuit are respectively connected to the print head.

[0015] Optionally, the first interface, the second interface, and the third interface are digital video interfaces.

[0016] Optionally, the fourth interface and the fifth interface are flexible circuit board interfaces.

[0017] Optionally, the second nozzle connection circuit further includes a sixth interface and a seventh interface, which are respectively connected to the deserialization receiving control module. The sixth interface is used to connect to a temperature sensor, and the seventh interface is used to connect to a heating sheet.

[0018] Optionally, the serial transmission control module is a DS90CR215 chip.

[0019] Optionally, the deserialization receiving control module is a DS90CR216 chip.

[0020] Optionally, the second pin, eighth pin, twenty-ninth pin, and thirty-seventh pin of the serial transmission control module are connected to a 3.3V power signal, and the first ends of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are connected to the thirty-seventh pin. The second ends of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are connected to the ground.

[0021] Optionally, the first nozzle connection circuit further includes a power indicator. The first end of the power indicator is connected to the power signal through a resistor R1, and the second end of the power indicator is connected to the ground.

[0022] Optionally, the twelfth pin, twentieth pin, twenty-eighth pin, thirty-sixth pin, forty-second pin, and forty-eighth pin of the deserialization receiving control module are connected to a 3.3V power signal;

[0023] The twenty-second pin of the deserialization receiving control module is connected to the 3.3V power signal through a fifth resistor R5;

[0024] The sixteenth pin of the deserialization receiving control module is connected to the second pin of the second interface of the first nozzle connection circuit; the seventeenth pin of the deserialization receiving control module is connected to the fourth pin of the second interface of the first nozzle connection circuit.

[0025] Optionally, the linear power control module is an LM1117IMP chip. The third pin of the LM1117IMP chip is connected to the first ends of the fourth capacitor C4 and the fifth capacitor C5 and is connected to a 5V power signal; the second pin and the fourth pin of the LM1117IMP chip are connected to the first end of the sixth capacitor C6 and are connected to a 3.3V power signal; the second ends of the fourth capacitor, the fifth capacitor, and the sixth capacitor are connected to the ground.

[0026] The embodiments of the present invention have the following advantages:

[0027] The interface circuit of the nozzle provided by the embodiment of the present invention. The interface circuit of the nozzle at least includes a headboard connection circuit, a first nozzle connection circuit, and a second nozzle connection circuit. The headboard connection circuit is respectively connected to the headboard and the first nozzle connection circuit. The first nozzle connection circuit is connected to the nozzle through the second nozzle connection circuit. Among them, the headboard connection circuit includes a serial transmission control module and a first interface. The first nozzle connection circuit includes a first interface, a second interface, and a third interface. The second nozzle connection circuit includes a deserialization reception control module, a linear power control module, a second interface, a third interface, a fourth interface, and a fifth interface. Among them, the deserialization reception control module is respectively connected to the linear power control module, the second interface, the third interface, the fourth interface, and the fifth interface. The first interface of the headboard connection circuit is connected to the first interface of the first nozzle connection circuit. The second interface and the third interface of the first nozzle connection circuit are respectively connected to the second interface and the third interface of the second nozzle connection circuit. The fourth interface and the fifth interface of the second nozzle connection circuit are respectively connected to the nozzle. The embodiment of the present invention provides a serializer / deserializer circuit between the headboard and the nozzle, and they are connected by a DVI-I interface and a standard cable. At the same time, the headboard can be removed from the existing machine head to the main control box, reducing the size of the machine head, enabling efficient maintenance of the nozzle and the ink supply system, and even making it a reasonable choice for customers to replace the entire machine head, thereby greatly improving the reliability and production efficiency of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. is a structural block diagram of a single-nozzle single-machine head provided by the prior art;

[0029] Figure 2 FIG. is a structural block diagram of a single-nozzle single-machine head provided by the prior art;

[0030] Figure 3 FIG. is a structural block diagram of the interface circuit of the nozzle provided by the embodiment of the present invention;

[0031] Figure 4 FIG. is a schematic diagram of the DVI interface connector provided by the present invention;

[0032] Figure 5 FIG. is a structural block diagram of the nozzle headboard interface circuit diagram provided by the embodiment of the present invention;

[0033] Figure 6 FIG. is a structural block diagram of the nozzle interface circuit diagram - 1 provided by the embodiment of the present invention;

[0034] Figure 7 FIG. is a structural block diagram of the nozzle interface circuit diagram - 2 provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0036] Referring to Figure 3 , a schematic structural diagram of an embodiment of the interface circuit of a nozzle of the present invention is shown. The interface circuit of the nozzle includes: a head board connection circuit 102, a first nozzle connection circuit 103, and a second nozzle connection circuit 104. The head board connection circuit 102 is respectively connected to the head board and the first nozzle connection circuit 103. The first nozzle connection circuit 103 is connected to the nozzle through the second nozzle connection circuit 104;

[0037] Among them, the head board connection circuit 102 includes a serial transmission control module and a first interface;

[0038] The first nozzle connection circuit 103 includes a first interface, a second interface, and a third interface;

[0039] The second nozzle connection circuit 104 includes a deserialization receiving control module, a linear power control module, a second interface, a third interface, a fourth interface, and a fifth interface. Among them, the deserialization receiving control module is respectively connected to the linear power control module, the second interface, the third interface, the fourth interface, and the fifth interface;

[0040] The first interface of the head board connection circuit 102 is connected to the first interface of the first nozzle connection circuit;

[0041] The second interface and the third interface of the first nozzle connection circuit 103 are respectively connected to the second interface and the third interface of the second nozzle connection circuit;

[0042] The fourth interface and the fifth interface of the second nozzle connection circuit 104 are respectively connected to the nozzle.

[0043] Specifically, in the prior art, a nozzle and a nozzle head board (referred to as the head board for short) are both provided inside the machine head. Since the nozzle head board inside the machine head has functions such as receiving nozzle data and synchronization signals, controlling and driving the nozzle, the size of the head board is relatively large, resulting in the inability to reduce the size of the machine head. Moreover, if a failure occurs in the machine head, it is impossible to quickly locate which part has a problem. For this problem, the embodiment of the present invention provides an interface circuit for the nozzle. This interface circuit is located between the head board and the nozzle. Since an interface circuit is added between the head board and the nozzle, the nozzle can be placed outside the machine head, thus reducing the size of the machine head.

[0044] Specifically, the interface circuit includes three parts, namely, a headboard connection circuit, a first nozzle connection circuit, and a second nozzle connection circuit. Among them, the headboard connection circuit is located on the headboard side and is connected to the headboard. The first nozzle connection circuit and the second nozzle connection circuit are located on the nozzle side and are connected to the nozzle. The first nozzle connection circuit is connected to the headboard connection circuit. A processor is provided on the headboard, and the processor is connected to the headboard connection circuit and sends control instructions to the headboard connection circuit.

[0045] Among them, the headboard connection circuit includes a serial transmission control module and a first interface;

[0046] The first nozzle connection circuit includes a first interface, a second interface, and a third interface;

[0047] Optionally, the first interface, the second interface, and the third interface are digital video interfaces, that is, DVI interfaces. The specific DVI interface is as Figure 4 shown, and the signal definition of each pin is shown in Table 1:

[0048] Table 1

[0049] Pin Number Signal Name Signal Function 1 T.M.D.S.Data2- T.M.D.S. Data 2- 2 T.M.D.S.Data2+ T.M.D.S. Data 2+ 3 T.M.D.S.Data2 / 4 Shield T.M.D.S. Data 2 / 4 Shield 4 T.M.D.S.Data4- T.M.D.S. Data 4- 5 T.M.D.S.Data4+ T.M.D.S. Data 4+ 6 DDC Clock DDC Clock 7 DDC Data DDC Data 8 Analog Vertical Sync Analog Vertical Sync 9 T.M.D.S.Datal- T.M.D.S. Data 1- 10 T.M.D.S.Datal+ T.M.D.S. Data 1+ 11 T.M.D.S.Data1 / 3 Shield T.M.D.S. Data 1 / 3 Shield 12 T.M.D.S.Data3- T.M.D.S. Data 3- 13 T.M.D.S.Data3+ T.M.D.S. Data 3+ 14 +5V Power +5V Power 15 Ground Ground (for +5V power supply, analog horizontal / vertical sync signals) 16 Hot Plug Detect Hot Plug Detect 17 T.M.D.S.Data0- T.M.D.S. Data 0- 18 T.M.D.S.Data0+ T.M.D.S. Data 0+ 19 T.M.D.S.Data0 / 5 Shield T.M.D.S. Data 0 / 5 Shield 20 T.M.D.S.Data5- T.M.D.S. Data 5- 21 T.M.D.S.Data5+ T.M.D.S. Data 5+ 22 T.M.D.S.Clock Shield T.M.D.S. Clock Shield 23 T.M.D.S.Clock+ T.M.D.S. Clock + 24 T.M.D.S.Clock- T.M.D.S. Clock - C1 Analog Red Analog Red (Red signal in the three primary color signal lines of analog video signal) C2 Analog Green Analog Green (Green signal in the three primary color signal lines of analog video signal) C3 Analog Blue Analog Blue (Blue signal in the three primary color signal lines of analog video signal) C4 Analog Horizontal Sync Analog Horizontal Sync C5 Analog Ground Ground (for analog R / G / B signals)

[0050] In Table 1, T.M.D.S. represents Transition Minimized Differential Signaling, that is, minimized transmission differential signal.

[0051] DVI stands for Digital Visual Interface, which is a dedicated interface standard for digital display devices such as LCD monitors. The DVI interface includes three standards: DVI-A, DVI-D, and DVI-I. Among them: DVI-A is a pure analog signal interface, DVI-D is a pure digital signal interface, and DVI-I is compatible with both digital and analog signal interfaces, that is, DVI-I is compatible with both DVI-A and DVI-D interfaces.

[0052] Among them, the second nozzle connection circuit is connected to the first nozzle connection circuit through the second interface and the third interface. The fourth interface and the fifth interface are connected to the nozzle, and the fourth interface and the fifth interface are flexible circuit board interfaces.

[0053] Among them, the second interface and the third interface are DVI sockets.

[0054] Optionally, the second nozzle connection circuit further includes a sixth interface and a seventh interface. The sixth interface and the seventh interface are respectively connected to a deserialization reception control module. The sixth interface is used to connect to a temperature sensor, and the seventh interface is used to connect to a heating element.

[0055] Optionally, the serial transmission control module is a DS90CR215 chip.

[0056] Optionally, the deserialization reception control module is a DS90CR216 chip.

[0057] Optionally, the second pin, the eighth pin, the twenty-ninth pin, and the thirty-seventh pin of the serial transmission control module are connected to a 3.3V power signal, and the first ends of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are connected to the thirty-seventh pin, and the second ends of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are connected to the ground.

[0058] Specifically, the purpose of the embodiment of the present invention is to provide an interface circuit between a nozzle and a nozzle headboard based on a serial / deserializer DVI-I interface, as Figure 5 - 7 shown. The interface circuit is divided into a nozzle headboard interface circuit, i.e., a headboard connection circuit 102, a nozzle interface circuit-1, i.e., a first nozzle connection circuit 103, and a nozzle interface circuit-2, i.e., a second nozzle connection circuit 104.

[0059] In the nozzle headboard interface circuit, the clock sent by the serial transmission controller is very crucial. The main reason is as follows: According to Table 2, which is the nozzle interface signal, there are 2 important clock signals in the nozzle control signal, namely SCK_X and MCK_X, which respectively represent the clock signals of the data shift register of the Xth row of nozzle holes and the analog switch control bit register. For nozzles from different manufacturers, these two clock frequencies are the same frequency, ranging from several MHz to dozens of MHz.

[0060] The serial transmission controller, i.e., the serial transmission control module DS90CR215, latches the nozzle control signals including these two clocks according to the rising edge of the transmission clock, and multiplies the transmission clock by 7 internally, so as to serially modulate and output all the nozzle digital control signals in the form of 3 pairs of LVDS differential signal lines, with 7 bits for each pair. Therefore, the transmission clock and the 2 clock signals required by the nozzle should ensure clock synchronization as much as possible to reduce the abnormal operation of the nozzle caused by signal delay.

[0061] In the embodiment of the present invention, the transmission clock, SCK_X, and MCK_X of the serial transmission controller DS90CR215 are all generated by the internal DCM (Digital Clock Manager) of the processor FPGA on the headboard, and SCK_X and MCK_X are the quarter-frequency of the serial transmission controller DS90CR215, so as to ensure the synchronization between these 3 clocks to the greatest extent, ensure that the timing of the nozzle control signal meets the requirements after passing through the serial / deserializer, and the nozzle works normally.

[0062] Summary of Nozzle Interface Signals in Table 2

[0063] Serial Number Signal Name Signal Attribute Signal Function 1 SD0_X Input Input data of the data shift register for the Xth row of spray holes [0] 2 SD1_X Input Input data of the data shift register for the Xth row of spray holes [1] 3 SD2_X Input Input data of the data shift register for the Xth row of spray holes [2] 4 SL_n_X Input Data latch of the data shift register for the Xth row of spray holes 5 SCK_X Input Clock of the data shift register for the Xth row of spray holes 6 MD_X Input Input data of the shift register for controlling the analog switch of the Xth row of spray holes 7 MCK_X Input The simulation switch control shift register clock for the Xth row of nozzle holes 8 ML_n_X Input The simulation switch control shift register data latch for the Xth row of nozzle holes 9 VCOM_X Power supply The driving signal for the Xth row of nozzle holes 10 COM_X Power supply ground The driving ground for the Xth row of nozzle holes 11 VCC_X Power supply The logic power supply (3.3V) for the Xth row of nozzle holes 12 GND_X Power supply ground The logic power supply ground for the Xth row of nozzle holes 13 VH_X Power supply The logic high voltage power supply (37V) for the Xth row of nozzle holes 14 HEATER+ Input The nozzle heater + 15 HEATER- Output The nozzle heater - 16 TH+ Input The nozzle temperature detection + 17 TH- Output The nozzle temperature detection -

[0064] Table 2 shows the summary of the interface signals of the piezoelectric nozzle. Nozzles from foreign manufacturers offer multiple nozzle models according to parameters such as resolution and printing width. The resolution of the single-row nozzle holes of these nozzles is usually 150 or 180 dpi. For different fields in the digital printing industry, nozzles with resolutions of 300, 600 dpi or higher and different printing widths are all applied. For example, in the field of inkjet coding, the resolutions of Ricoh GH2220 and MH2420 are 300 dpi and the printing width is 32.4 mm. In the fields of digital publishing and labels, the resolutions of Ricoh MH5420 and MH5320 are 600 dpi and the printing width is 54 mm.

[0065] In addition, most of these nozzles have internally integrated a rigid-flex hybrid PCB with a length not exceeding 500 mm. The rigid PCB is used for plugging into a designated brand socket with no less than 30 pins on the nozzle head board, and the flexible PCB connects the interface signals to the nozzle. There are also some nozzles that only provide a socket with no less than 30 pins, and customers need to design or purchase FPC cables by themselves to connect the nozzle and the nozzle head board.

[0066] Optionally, the first nozzle connection circuit further includes a power indicator D1. The first end of the power indicator is connected to the power signal through a resistor R1, and the second end of the power indicator D1 is connected to the ground.

[0067] Based on the above embodiments, to ensure the minimization of the nozzle interface board size and facilitate installation and maintenance, the embodiment of the present invention divides the interface circuit on one side of the nozzle into two boards, namely nozzle interface board - 1 and nozzle interface board - 2, and the nozzle interface board - 2 adopts a rigid-flex hybrid PCB design.

[0068] The power indicator D1 is a light-emitting diode.

[0069] As Figure 6 shown, the nozzle interface board - 1 provided by the embodiment of the present invention includes a first socket (second interface) JP1 for connecting the nozzle interface board - 1 and the nozzle interface board - 2, a second socket (third interface) JP2, and a first socket (first interface) JP3 of DVI-I(24 + 5) for connecting to one side of the nozzle head board.

[0070] Among them: The main functions of the first socket JP1 and the second socket JP2 are to connect the signals on the first socket of DVI-I(24 + 5) to the nozzle interface board - 2;

[0071] The first resistor R1 and the first diode D1 are used to indicate VCC (5V power supply) provided by the nozzle head board on the first socket of DVI-I(24 + 5);

[0072] The first capacitor C1 and the second capacitor C2 are used for decoupling the power supply VCC (5V power supply);

[0073] The second resistor R2 and the third capacitor C3 are used for decoupling the DVI-I(24 + 5) socket housing and the power ground of the nozzle interface board.

[0074] Specifically, as Figure 7 shown, the nozzle interface board-2 provided by the embodiment of the present invention includes a deserialization receiving control module U1 and a linear power control module U2. The twelfth pin, the twentieth pin, the twenty-eighth pin, the thirty-sixth pin, the forty-second pin, and the forty-eighth pin of the deserialization receiving control module are connected to the 3.3V power signal;

[0075] The twenty-second pin of the deserialization receiving control module is connected to the 3.3V power signal through the fifth resistor R5;

[0076] The sixteenth pin of the deserialization receiving control module is connected to the second pin of the second interface of the first nozzle connection circuit; the seventeenth pin of the deserialization receiving control module is connected to the fourth pin of the second interface of the first nozzle connection circuit.

[0077] Optionally, the linear power control module is an LM1117IMP chip. The third pin of the LM1117IMP chip is connected to the first end of the fourth capacitor C4 and the first end of the fifth capacitor C5, and is connected to the 5V power signal; the second pin and the fourth pin of the LM1117IMP chip are connected to the first end of the sixth capacitor C6 and are connected to the 3.3V power signal; the second ends of the fourth capacitor, the fifth capacitor, and the sixth capacitor are connected to the ground.

[0078] Specifically, as Figure 7 shown, the nozzle interface board-2 provided by the embodiment of the present invention, that is, the second nozzle connection circuit, includes a nozzle interface board-1, a nozzle interface board-2 connector first socket (second interface) JP1, a second socket (third interface) JP2, an alternative temperature sensing socket third socket (sixth interface) JP3, an alternative heating element socket fourth socket (seventh interface) JP4, a nozzle connection flexible FPC plug fifth plug (fourth interface) JP5, a nozzle connection flexible FPC plug sixth plug (fifth interface) JP6, a deserialization receiving controller U1, and a 5V to 3.3V linear power controller U2.

[0079] Among them: The main functions of the first socket JP1 and the second socket JP2 are to connect the signals on its DVI-I(24 + 5) socket to the nozzle interface board-2 by connecting to the nozzle interface board-1;

[0080] For nozzles from different manufacturers, some nozzles integrate heating and temperature detection sensors inside, while some do not. External heating and temperature detection sensor interfaces need to be provided. Therefore, the third socket JP3 and the fourth socket JP4 can be used for nozzles that do not integrate the corresponding functions internally;

[0081] The serial transmission controller, i.e., the deserialization receiving control module U1, is powered by 3.3V and selects the 21-bit Channel Link deserialization receiving controller DS90CR216 with rising-edge data strobe LVDS (Low-Voltage Differential Signaling). The power pins 12, 20, 28, 36, 42, and 48 of this deserialization receiving control module are connected to the 3.3V power supply, and the 3.3V power supply is decoupled through the first capacitor C1, the second capacitor C2, and the third capacitor C3.

[0082] The pin 22 (PWRDWN#) of the deserialization receiving control module is pulled up to the 3.3V power supply through the fifth resistor R5 to ensure the normal operation of the controller.

[0083] This deserialization receiving control module deserializes the 3 pairs of LVDS data differential signal pairs received through the LVDS differential pair RXCLK_IN_N / P of the serial receiving clock transmitted through the serial transmission controller on one side of the header board and through the DVI-I (24 + 5) interface, so as to restore the digital control signals of the two rows of nozzle holes of the nozzle. These control signals are connected to the fifth plug JP5 and the sixth plug JP6 of the FPC of the nozzle through the high-voltage power supply VH of the two rows of nozzle holes of the nozzle, the analog drive signals VCOM_1 / 2, the nozzle heating HEATER+ / - and the nozzle temperature detection signals TH+ / - of the nozzle.

[0084] The first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are respectively used as the termination resistors for the 3 pairs of LVDS data differential signal pairs and the receiving clock of the deserialization receiving controller DS90CR216;

[0085] The linear power supply U1 selects LM1117IMP and forms a power supply module with the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 to convert the power supply VCC (5V power supply) transmitted by the nozzle interface board - 1 into the power supply 3V3 (3.3V power supply) required by the deserialization receiving controller U1 and the nozzle.

[0086] For convenient testing, the first test point TP1 is used as the test point for the receiving clock of the serial receiving controller.

[0087] In order to miniaturize the head in the embodiment of the present invention, the nozzle interface circuit is designed into a miniaturized and highly reliable PCB structure. Specifically, the nozzle interface circuit is split into two circuits, namely the nozzle interface circuit - 1 and the nozzle interface circuit - 2, for PCB design. Among them, the nozzle interface circuit - 1 mainly includes a DVI-I (24 + 5) socket and a power indicator. After the nozzle interface circuits - 1 and 2 are connected through their connectors, the overall length and width dimensions are only the dimensions of the nozzle interface circuit - 1;

[0088] In addition, considering that the nozzle interface circuit - 2 needs to be docked with the nozzle, using an independent FPC socket will increase the size of the interface circuit on the one hand, and on the other hand, the FPC cable needs to be purchased separately and docked with the nozzle interface board - 2 and both ends of the nozzle respectively for plugging, which will reduce the reliability of the nozzle connection. Therefore, the embodiment of the present invention adopts a rigid - flexible hybrid PCB design method, and connects the nozzle through the FPC plugs JP5\6 on the flexible part of the board, thereby increasing the reliability of the nozzle connection.

[0089] The embodiment of the present invention first introduces a 21 - bit Channel Link serial / deserial controller and a DVI - I interface into the nozzle and the nozzle head board, thereby moving the nozzle head board out of the machine head, greatly reducing the size of the machine head. In addition, the rigid - flexible hybrid design of the nozzle interface circuit increases the reliability of the nozzle connection and improves the maintenance efficiency of the machine head. The above improvements are very crucial for the design of single / multi - head systems.

[0090] The interface circuit of the nozzle provided by the embodiment of the present invention at least includes a head board connection circuit, a first nozzle connection circuit, and a second nozzle connection circuit. The head board connection circuit is respectively connected to the head board and the first nozzle connection circuit. The first nozzle connection circuit is connected to the nozzle through the second nozzle connection circuit. Among them, the head board connection circuit includes a serial transmission control module and a first interface; the first nozzle connection circuit includes a first interface, a second interface, and a third interface; the second nozzle connection circuit includes a deserialization receiving control module, a linear power supply control module, a second interface, a third interface, a fourth interface, and a fifth interface. Among them, the deserialization receiving control module is respectively connected to the linear power supply control module, the second interface, the third interface, the fourth interface, and the fifth interface; the first interface of the head board connection circuit is connected to the first interface of the first nozzle connection circuit; the second interface and the third interface of the first nozzle connection circuit are respectively connected to the second interface and the third interface of the second nozzle connection circuit; the fourth interface and the fifth interface of the second nozzle connection circuit are respectively connected to the nozzle. The embodiment of the present invention provides a serializer / deserializer - based circuit between the head board and the nozzle, and they are connected by a DVI - I interface and a standard cable. At the same time, the head board can be moved from the existing machine head to the main control box, making the size of the machine head smaller, the nozzle and the ink supply system easy to maintain, and even the overall replacement of the machine head a reasonable choice for customers, thereby greatly improving the reliability and production efficiency of the whole machine.

[0091] It should be noted that the above - mentioned detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0092] It should be noted that the terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of the features, steps, operations, devices, components, and / or combinations thereof.

[0093] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0094] In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0095] For ease of description, spatial relative terms such as "above", "on top of", "on the upper surface", "above-mentioned", etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figure is inverted, the device described as "above" or "on top of" other devices or structures will then be positioned "below" or "beneath" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the corresponding explanations are made for the spatial relative descriptions used herein.

[0096] In the detailed description above, reference has been made to the drawings, which form a part hereof. In the drawings, like symbols typically identify like components, unless the context indicates otherwise. The illustrated embodiments described in the detailed description, the drawings, and the claims are not meant to be limiting. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the subject matter presented herein.

[0097] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An interface circuit of a nozzle, characterized in that, The interface circuit of the nozzle at least includes a headboard connection circuit, a first nozzle connection circuit, and a second nozzle connection circuit. The headboard connection circuit is respectively connected to the headboard and the first nozzle connection circuit, and the first nozzle connection circuit is connected to the nozzle through the second nozzle connection circuit; Among them, the headboard connection circuit includes a serial transmission control module and a first interface; The first nozzle connection circuit includes a first interface, a second interface, and a third interface; The second nozzle connection circuit includes a deserialization reception control module, a linear power control module, a second interface, a third interface, a fourth interface, and a fifth interface. Among them, the deserialization reception control module is respectively connected to the linear power control module, the second interface, the third interface, the fourth interface, and the fifth interface; The first interface of the headboard connection circuit is connected to the first interface of the first nozzle connection circuit; The second interface and the third interface of the first nozzle connection circuit are respectively connected to the second interface and the third interface of the second nozzle connection circuit; The fourth interface and the fifth interface of the second nozzle connection circuit are respectively connected to the nozzle; Among them, the twelfth pin, the twentieth pin, the twenty-eighth pin, the thirty-sixth pin, the forty-second pin, and the forty-eighth pin of the deserialization reception control module are connected to the 3.3V power signal; The twenty-second pin of the deserialization reception control module is connected to the 3.3V power signal through the fifth resistor R5; The sixteenth pin of the deserialization reception control module is connected to the second pin of the second interface of the first nozzle connection circuit; the seventeenth pin of the deserialization reception control module is connected to the fourth pin of the second interface of the first nozzle connection circuit.

2. The interface circuit of the nozzle according to claim 1, characterized in that The first interface, the second interface, and the third interface are digital video interfaces.

3. The interface circuit of the nozzle according to claim 1, characterized in that, The fourth interface and the fifth interface are flexible circuit board interfaces.

4. The interface circuit of the nozzle according to claim 1, characterized in that, The second nozzle connection circuit further includes a sixth interface and a seventh interface. The sixth interface and the seventh interface are respectively connected to the deserialization reception control module. The sixth interface is used to connect to a temperature sensor, and the seventh interface is used to connect to a heating sheet.

5. The interface circuit of the nozzle according to claim 1, characterized in that, The serial transmission control module is a DS90CR215 chip.

6. The interface circuit of the nozzle according to claim 1, characterized in that, The deserialization reception control module is a DS90CR216 chip.

7. The interface circuit of the nozzle according to claim 5, characterized in that The second pin, the eighth pin, the twenty-ninth pin, and the thirty-seventh pin of the serial transmission control module are connected to the 3.3V power signal, and the first ends of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are connected to the thirty-seventh pin. The second ends of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are connected to the ground.

8. The interface circuit of the nozzle according to claim 6, characterized in that, The first nozzle connection circuit further includes a power indicator. The first end of the power indicator is connected to the power signal through the resistor R1, and the second end of the power indicator is connected to the ground.

9. The interface circuit of the nozzle according to claim 1, characterized in that The linear power control module is an LM1117IMP chip. The third pin of the LM1117IMP chip is connected to the first ends of the fourth capacitor C4 and the fifth capacitor C5, and is also connected to the 5V power signal. The second and fourth pins of the LM1117IMP chip are connected to the first end of the sixth capacitor C6 and are also connected to the 3.3V power signal. The second ends of the fourth, fifth, and sixth capacitors are connected to the ground.

Images