WO1995016568A1 - Procede et dispositif d'entrainement d'une tete d'impression a jet d'encre - Google Patents

Procede et dispositif d'entrainement d'une tete d'impression a jet d'encre Download PDF

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Publication number
WO1995016568A1
WO1995016568A1 PCT/JP1994/002105 JP9402105W WO9516568A1 WO 1995016568 A1 WO1995016568 A1 WO 1995016568A1 JP 9402105 W JP9402105 W JP 9402105W WO 9516568 A1 WO9516568 A1 WO 9516568A1
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WO
WIPO (PCT)
Prior art keywords
ink
pressure chamber
driving
jet head
piezoelectric element
Prior art date
Application number
PCT/JP1994/002105
Other languages
English (en)
Japanese (ja)
Inventor
Yasuhisa Fujii
Hisayoshi Fujimoto
Nobuhisa Ishida
Original Assignee
Rohm Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rohm Co., Ltd. filed Critical Rohm Co., Ltd.
Publication of WO1995016568A1 publication Critical patent/WO1995016568A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04541—Specific driving circuit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04588—Control methods or devices therefor, e.g. driver circuits, control circuits using a specific waveform

Definitions

  • the present invention relates to a driving method and a driving device for an ink jet head using a vibration plate that sucks and ejects ink by changing the volume of a pressure chamber by being deformed by a piezoelectric element.
  • the inkjet head is a device that transmits the deformation of the piezoelectric element to the diaphragm, reduces the volume of the pressure chamber, raises the pressure, and ejects ink droplets from the nozzles.
  • the deformation of the piezoelectric element is realized by changing the drive voltage applied to the piezoelectric element.
  • the piezoelectric element is deformed and becomes a driving state when the applied driving voltage is increased. Therefore, the drive voltage is controlled by switching between two voltage levels, the highest drive voltage and the lowest drive voltage.
  • FIG. 9a to 9e show the steps of the ink ejection method using the pressing method.
  • the drive voltage applied to the piezoelectric element 40 is the minimum drive voltage
  • the piezoelectric element 40 and the diaphragm 41 are not deformed
  • the ink The meniscus 42 advances to the tip of the nozzle 43.
  • the meniscus 42 refers to the liquid level at the tip of the ink in the nozzle 43.
  • the highest drive voltage is applied to the piezoelectric element 40, and the diaphragm 41 is bent inside the pressure chamber 44 by the deformation of the piezoelectric element 40, so that the pressure chamber is deformed.
  • the piezoelectric element 40 and the vibrating plate 41 bulge further outward due to inertia, and the meniscus 42 in the nozzle 43 recedes in the direction of the pressure chamber 44. Thereafter, for a certain period of time, the piezoelectric element 40 and the vibrating plate 41 perform so-called damped vibration. Thereafter, as shown in FIG. 9e, the piezoelectric element 40 and the diaphragm 41 return to the standby state, that is, a state where there is no deformation again, and the meniscus 42 gradually moves to the tip of the nozzle 43 by capillary action. Go back.
  • FIG. 10a to FIG. 10e show the steps of the ink ejection method by the drawing method.
  • the highest drive voltage is applied to the piezoelectric element 40 in the standby state. In this state, the piezoelectric element 40 is deformed, and the vibration plate 41 is radiused inside the pressure chamber 44. The meniscus 42 of the ink has advanced to the tip of the nozzle 43.
  • the drive voltage of the piezoelectric element 40 is reduced to the minimum drive voltage, the radius of the diaphragm 41 is eliminated, and the volume of the pressure chamber 44 is increased.
  • the meniscus 42 retreats in the direction of the pressure chamber 44, and ink is supplied to the pressure chamber 44 from the ink supply path 46 side.
  • the highest drive voltage is again applied to the piezoelectric element 40, deforming the piezoelectric element 40, and bending the diaphragm 41 inside the nozzle 43.
  • the ink droplet 45 is ejected from the nozzle 43 by reducing the volume of the nozzle 43.
  • the piezoelectric element 40 and the vibrating plate 41 go too far due to inertia as shown by an arrow 47, and then return as shown by an arrow 48 in FIG.
  • the pressure inside becomes negative pressure, and ink droplets 45 are separated.
  • the piezoelectric element 40 and the vibration plate 41 perform so-called damped vibration for a certain time.
  • the piezoelectric element 40 and the diaphragm 41 return to the standby state, that is, the state resting radially inside the pressure chamber 44, and the meniscus 4 2 Also gradually returns to the tip of nozzle 43 due to capillary action.
  • the above-described pushing and pulling methods are realized by controlling the driving voltage applied to the piezoelectric element 40 to a predetermined waveform.
  • FIG. 11a and FIG. 1lb show waveforms of the driving voltage used in the pushing method.
  • the vertical axis in FIGS. 11a and 11b represents the voltage, that is, the magnitude of the driving voltage, and the horizontal axis represents time.
  • FIG. 11a shows an exponential curve wave
  • FIG. 11b shows a triangular wave.
  • the types of these waves can be appropriately selected depending on the characteristics of the device.
  • the time T5 during which the minimum drive voltage is applied to the piezoelectric element 40 is in the standby state. Then, at time T6 when the drive voltage rises from the lowest drive voltage to the highest drive voltage, ink droplets 45 are ejected. Subsequently, at time T7 when the drive voltage decreases from the highest drive voltage to the lowest drive voltage, separation of the ink droplets 45 and supply of ink to the pressure chambers 44 are performed.
  • FIG. 12a and FIG. 12b show the waveforms of the driving voltage used in the drawing method.
  • the vertical axis in FIGS. 12a and 12b represents the voltage, that is, the magnitude of the driving voltage, and the horizontal axis represents time.
  • Fig. 12a shows an exponential curve wave
  • Fig. 12b shows a triangular wave.
  • the types of these waves can be appropriately selected depending on the characteristics of the device.
  • the time T8 during which the maximum drive voltage is applied to the piezoelectric element 40 is a standby state.
  • ink is supplied to the pressure chambers 44.
  • the ink droplet 45 is ejected.
  • a pressure chamber having an inlet for introducing ink and a nozzle for ejecting ink, a diaphragm for varying the volume of the pressure chamber, A piezoelectric element that draws and ejects ink in the pressure chamber by deforming the vibration plate, and a method of driving an ink jet head that is equipped with a piezoelectric element.
  • a suction step in which the lowest drive voltage is applied from the standby state where the drive voltage is applied to suck the ink into the pressure chamber, and an injection step in which the highest drive voltage is applied to the piezoelectric element immediately after the suction step to eject ink in the pressure chamber.
  • the return step is performed within a time of 300 s or less. More preferably, the return step is performed within a time of not less than 200 us and not more than 200 as.
  • a voltage of 0 volt or more is used as the minimum drive voltage.
  • any one of an exponential curve wave, a triangular wave, and a trapezoidal wave is used as the waveform of the drive voltage applied to the piezoelectric element. .
  • a pressure chamber having an inlet for introducing an ink and a nozzle for ejecting ink, a diaphragm for changing the volume of the pressure chamber, and a driving voltage applied according to an applied driving voltage
  • a pressure chamber having an inlet for introducing ink and a nozzle for ejecting ink, a diaphragm for changing the volume of the pressure chamber, and a driving voltage applied in accordance with the applied driving voltage
  • the radius of the diaphragm is set to a medium value, the ink of the nozzle is piled up to its surface tension, pulled back to the pressure chamber side, and returned to the standby state.
  • Inkjet head features To provide a dynamic way.
  • a pressure chamber having an inlet for introducing ink and a nozzle for ejecting ink, a diaphragm for changing the volume of the pressure chamber, and a driving voltage applied in accordance with the applied driving voltage
  • a piezoelectric element for sucking and ejecting the ink in the pressure chamber by deforming the vibration plate, and a driving device of the ink jet head for driving the ink jet head comprising: A control circuit for controlling the drive voltage applied to the piezoelectric element to bend the diaphragm, and this control circuit minimizes the amount of flexure from a standby state in which the radius of the diaphragm is set to a medium value, A suction step of sucking ink into the chamber, an injection step of maximizing the radius of the diaphragm immediately after the suction step to eject ink in the pressure chamber, and a medium deflection of the diaphragm immediately after the ejection step.
  • a pressure chamber having an inlet into which an ink is introduced and a nozzle for ejecting the ink, a diaphragm for changing the volume of the pressure chamber, A piezoelectric element for sucking and ejecting ink in the pressure chamber by deforming the vibration plate, and a driving device for the ink jet head for driving an ink jet head having a piezoelectric element.
  • a control circuit for controlling the drive voltage applied to the piezoelectric element to vary the volume of the pressure chamber by bending the vibration plate, and the control circuit is configured to operate from a standby state in which the volume of the pressure chamber is medium.
  • Ink to pressure chamber with maximum volume A pressure chamber with a minimum volume immediately after the inhalation process, and an injection process in which the pressure chamber ink is ejected with the pressure chamber volume minimized immediately after the inhalation process.
  • the present invention provides a drive device for an ink jet head, wherein the ink jet head is pulled back to the pressure chamber side against the surface tension thereof and returns to a standby state.
  • FIG. 1 is a block diagram of a control circuit provided in an inkjet head driving device according to an embodiment of the present invention.
  • FIG. 2 is a circuit diagram of an output circuit constituting a part of a control circuit provided in the ink jet head driving device according to one embodiment of the present invention.
  • FIG. 3 is a circuit diagram of a clock input circuit constituting a part of a control circuit provided in the ink jet head driving device according to one embodiment of the present invention.
  • FIG. 4 is a circuit diagram of a serial data output circuit constituting a part of a control circuit provided in the inkjet head driving device according to one embodiment of the present invention.
  • FIG. 5 is a circuit diagram of a latch pulse input circuit constituting a part of a control circuit provided in the inkjet head driving device according to one embodiment of the present invention.
  • FIG. 6 is a circuit diagram of a strobe signal input circuit constituting a part of a control circuit provided in the inkjet head driving device according to one embodiment of the present invention.
  • 7a to 7c are waveform diagrams showing examples of the waveform of the drive voltage used in the inkjet head drive device according to one embodiment of the present invention.
  • 8a to 8e are explanatory views of an ink ejection procedure by the ink jet head driving device according to one embodiment of the present invention.
  • 9a to 9e are explanatory diagrams of the ink ejection procedure by the conventional pressing method.
  • FIG. 103 to FIG. 1 Oe are explanatory views of an ink ejection procedure by a conventional drawing method.
  • FIG. 1 la and FIG. 1 lb are waveform diagrams showing waveforms of the drive voltage used in the conventional pushing method.
  • FIG. 12a and FIG. 12b are waveform diagrams showing waveforms of the driving voltage used in the conventional drawing method.
  • FIG. 1 shows one block of a control circuit provided in an inkjet head drive device according to an embodiment of the present invention.
  • the control circuit is configured by arranging a predetermined number of the blocks in parallel.
  • This control circuit block consists of a shift register 1 consisting of many D flip-flops, a latch circuit 2 consisting of many D flip-flops, a large number of AND circuits 3, a large number of output circuits 4, and a large number of output circuits 4. It is equipped with a five-day event.
  • the number of D flip-flops constituting the shift register 1, the D flip-flops constituting the latch circuit 2, the AND circuit 3, the output circuit 4, and the inverter 5 are determined by the length of the ink jet head.
  • the control circuit further includes a clock input circuit 6, a serial data input circuit 7, a serial data output circuit 8, a latch pulse input circuit 9, a strobe signal input circuit 10, a clock signal input terminal 11, and a serial data input terminal.
  • the number of the output terminals 20 is equal to the number of the output circuits 4.
  • the output circuit 4 has a first control signal input terminal 21 connected to the output terminal of the AND circuit 3 and a second control signal input terminal 22 connected to the output terminal of the inverter 5. ing.
  • the first control signal input terminal 21 is grounded via the resistor R3 and the transistor Tr1.
  • the base of transistor Tr1 is the collector of transistor Tr1 and the base of transistor Tr2. It is connected to the base, and the emitter of transistor Tr2 is grounded.
  • the collector of the transistor Tr2 is connected to the bases of the transistor Tr3 and the transistor Tr5.
  • the emitter of the transistor Tr3 is connected to the drive voltage input terminal 16 and the collector of the transistor Tr4 and the cathode of the diode D3. And connected to.
  • the collector of the transistor Tr3 is connected to the base of the transistor Tr4, and the resistor R4 is connected in parallel between the base and the emitter of the transistor Tr4.
  • the emitter of the transistor Tr 4 is connected to the diode D 1, and the diode D 1 has a power source connected to the diode D 2 cathode, the output terminal 20 and the transistor Tr 5 emitter.
  • the collector of transistor Tr6 One end of a piezoelectric element 23 for ejecting ink is connected to the output terminal 20, and the other end of the piezoelectric element 23 is grounded. The details of the piezoelectric element 23 will be described later.
  • the collector of the transistor Tr5 is connected to the base of the transistor r6, and a resistor R5 is connected in parallel between the base and the emitter of the transistor Tr6.
  • the emitter of the transistor Tr6 is connected to the anode of the diode D3, and the anode of the diode D2 is connected to the emitter of the transistor Tr8.
  • the collector of the transistor Tr8 is connected to the intermediate voltage input terminal 17 and the emitter of the transistor Tr7, and the collector of the transistor Tr7 is connected to the base of the transistor Tr8.
  • the base of the transistor Tr7 is connected to the collector of the transistor Tr10, and the emitter of the transistor Tr10 is grounded.
  • the base of the transistor Tr10 is connected to the base and the collector of the transistor Tr9, and the emitter of the transistor Tr9 is grounded.
  • the second control signal input terminal 22 is connected to the collector of the transistor Tr9 via the resistor R6.
  • an analog switch or the like can be used in addition to such a circuit.
  • FIG. 3 shows the clock input circuit 6.
  • One end of the resistor R7 is connected to the clock signal input terminal 11 and the other end of the resistor R7 is connected to the anode of the diode D4, the cathode of the diode D5, and the field effect transistors FET1 and FET2. Connected to the gate.
  • the force source of diode D4 is connected to the diode D5 via field effect transistors FET1 and FET2.
  • the serial data input circuit 7 has the same circuit configuration as the clock input circuit 6.
  • FIG. 4 shows a serial data output circuit 8.
  • the field effect transistors F ET3 and FET4 are connected to the serial data output terminal 13.
  • FIG. 5 shows the latch pulse input circuit 9.
  • One end of the resistor R 8 is connected to the latch pulse input terminal 14, and the other end of the resistor R 8 is connected to the anode of the diode D 6, the cathode of the diode D 7, and the field effect transistors FET 5 and FET 6. Connected to the gate.
  • the force sword of diode D 6 is connected to the node of diode D 7 via field effect transistors F ET 5 and F ET 6, and a resistor R 9 is connected in parallel to diode D 6. ing.
  • FIG. 6 shows the strobe signal input circuit 10.
  • One end of the resistor R10 is connected to the strobe signal input terminal 15 and the other end of the resistor R10 is connected to the diode D8 anode and the diode D9 cuff and the electric field. It is connected to the gates of the effect transistors FET7 and FET8.
  • the power source of the diode D8 is connected to the diode D9 via a field effect transistor FET7 and FET8, and a resistor R11 is connected in parallel to the diode D9. It is connected.
  • FIG. 7a shows the waveform of the drive voltage supplied from the output circuit 4 to the piezoelectric element 23 via the output terminal 20.
  • the vertical axis represents the drive voltage
  • the horizontal axis represents time.
  • the waveform of the drive voltage is an exponential curve wave.
  • a triangular wave as shown in FIG. 7b or a trapezoidal wave as shown in FIG. 7c may be used.
  • the types of these waves can be appropriately selected depending on the characteristics of the device.
  • a number of pressure chambers 28 for sucking and ejecting the ink 27 are formed by covering a number of recesses with the vibration plate 26, respectively. I have.
  • the head body 25 has an inlet 2 9 for supplying the ink 27 to the pressure chamber 28.
  • a nozzle 30 for ejecting the ink 27 from the pressure chamber 28, and the inlet 29 is in communication with the ink supply path 31.
  • a piezoelectric element 23 is fixed to each of the vibration plates 26. The deformation of the piezoelectric element 23 deforms the vibration plate 26, and the volume of the pressure chamber 28 changes.
  • a clock signal is input to the clock signal input terminal 11 in FIG. 1 from, for example, a control unit of a printing device (not shown) provided with an ink jet head.
  • This clock signal is input via the clock input circuit 6 to the timing signal input terminal of the D flip-flop constituting the shift register 1.
  • print data is serially input to the serial data input terminal 12 from the control unit.
  • This print data is serially input to the data input terminal of the D flip-flop constituting the shift register 1 in synchronization with the clock signal supplied to the timing signal input terminal via the serial data input circuit 7. Then, the print data of 64 bits is temporarily stored in the shift register 1.
  • the latch pulse is transmitted via the latch pulse input circuit 9 to the latch circuit of the D flip-flop constituting the latch circuit 2. Input to the input terminal.
  • the print data from the data output terminal of the D flip-flop constituting the shift register 1 is input in parallel to the data input terminal of the D flip-flop constituting the latch circuit 2, and the print data is inputted.
  • the print data is latched by the latch circuit 2 and output from the data output terminal of the D flip-flop constituting the latch circuit 2 to one input terminal of the AND circuit 3.
  • the next print data is temporarily stored in the shift register 1, and at that time, the previous print data is output from the serial data output terminal 13 through the serial data output circuit 8. Is done.
  • a strobe signal is input from the control unit to the strobe signal input terminal 15, this strobe signal is input to the other input terminal of the AND circuit 3 via the strobe signal input circuit 10.
  • the latch pulse is at the high level, and the bit corresponding to the dot that requires printing is at the high level during printing, so the logical product circuit 3 responds to the dot that requires printing.
  • a high-level signal is output to prevent dots that do not need to be printed.
  • the corresponding AND circuit 3 outputs a low-level signal.
  • the dot means one of many points that can be printed by the ink jet head, and one of the many nozzles 30 of the ink jet head. Each corresponds to one dot.
  • the output of the AND circuit 3 is input to the first control signal input terminal 21 of the output circuit 4, and is inverted by the inverter 5 and input to the second control signal input terminal 22 of the output circuit 4. You.
  • a high-level signal from the AND circuit 3 is input to the first control signal input terminal 21 in FIG.
  • the transistors Trl and Tr2 are turned on, the transistors Tr3 and Tr4 are turned on, and the drive voltage input to the drive voltage input terminal 16 changes from the transistor Tr4 to the diode. It is output from the output terminal 20 via D 1 and applied to the piezoelectric element 23.
  • the high-level signal from the AND circuit 3 is inverted by the inverter 5 and is supplied to the second control signal input terminal 22 as an input-level signal, so that the transistors Tr 9 and T 9 r 10 is not turned on, and the intermediate voltage input to the intermediate voltage input terminal 17 is not applied to the piezoelectric element 23.
  • the drive voltage applied to the piezoelectric elements 23 is a repetitive waveform having the same fixed period as the waveform shown in FIG. 7a, and the strobe signal input to the strobe signal input terminal 15 is applied to the drive voltage input terminal 1
  • the drive voltage is synchronized with the drive voltage input to 6, and one cycle of the drive voltage is applied to the piezoelectric element 23.
  • the intermediate drive voltage V M is lower than the highest drive voltage V H and higher than the lowest drive voltage V L. These V H, V M, and V L are appropriately determined according to various design conditions. In the present embodiment, the minimum drive voltage V L is 0 volt.
  • the piezoelectric element 23 has the largest bending amount when the highest driving voltage VH is applied, and has the smallest bending amount when the lowest driving voltage VL is applied.
  • the intermediate drive voltage VM When the intermediate drive voltage VM is applied, the amount of deflection is intermediate.
  • the minimum drive voltage VL is 0 volt, when the minimum drive voltage VL is applied, the radius of the piezoelectric element 23 is zero, and the flatness is maintained.
  • the one-level signal from the AND circuit 3 is inverted by the inverter 5, and the second control signal is input as a high-level signal. Input to input terminal 22.
  • the transistors Tr9 and Tr10 are turned on, the transistors Tr7 and Tr8 are turned on, and the intermediate voltage input to the intermediate voltage input terminal 17 is applied to the transistor Tr8 and the diode D
  • the signal is output from the output terminal 20 via the terminal 2 and is applied to the piezoelectric element 23.
  • the transistors Tr 1 and Tr 2 do not turn on, but are input to the drive voltage input terminal 16.
  • the applied driving voltage is not applied to the piezoelectric element 23.
  • the intermediate voltage applied to the piezoelectric element 23 has the same magnitude as the intermediate drive voltage VM. That is, the piezoelectric element 23 corresponding to a dot that does not require printing is bent by the same amount of radius as when the intermediate drive voltage VM is applied.
  • the electric charge charged in the piezoelectric element 23 is discharged by a discharge circuit including the transistors Tr5 and Tr6, the resistor R5, the diode D3, and the like.
  • a discharge circuit including the transistors Tr5 and Tr6, the resistor R5, the diode D3, and the like.
  • an intermediate drive voltage VM is applied to the piezoelectric element 23 during a time T1 shown in FIG. 7a.
  • the piezoelectric element 23 bends by a predetermined amount in accordance with the drive voltage, the diaphragm 26 similarly bends, and the volume of the pressure chamber 28 becomes a predetermined amount. This state is a standby state.
  • the amount of deflection of the piezoelectric element 23 decreases in accordance with the drive voltage, and as shown in FIG.
  • the deformation of the diaphragm 26 is eliminated, and the volume of the pressure chamber 28 is maximized.
  • the pressure chamber 28 has a negative pressure
  • the meniscus 32 which is the liquid level at the tip of the ink 27 in the nozzle 30, retreats in the direction of the pressure chamber 28.
  • the ink 27 is supplied to the pressure chamber 28 from the ink supply path 31, and the pressure chamber 28 is filled with the ink 27 corresponding to the volume.
  • the radius of the piezoelectric element 23 increases in accordance with the drive voltage.
  • the piezoelectric element 23 is deformed to the maximum, and the diaphragm 26 is largely bent inside the pressure chamber 28.
  • the maximum driving voltage VH is higher than the intermediate driving voltage VM, and the deformation of the piezoelectric element 23 is increased. Accordingly, the radius of the diaphragm 26 is larger than in the standby state, and the volume of the pressure chamber 28 is also minimized. Therefore, the pressure chamber 28 becomes positive pressure and the nozzle 30 Ink drops 3 3 are ejected from ⁇
  • the drive voltage of the piezoelectric element 23 is immediately reduced from the maximum drive voltage VH to the intermediate drive voltage VM.
  • T4 as shown in Fig. 8d, the piezoelectric element 23 is in a standby state, the deformation of the piezoelectric element 23 is relaxed, and the deflection of the diaphragm 26 to the pressure chamber 28 is reduced. .
  • the pressure in the pressure chamber 28 becomes negative pressure, the ink droplets 33 are separated, and the ink 27 in the nozzle 30 is pulled back to the pressure chamber 28 against the ink 27 force and surface tension.
  • the meniscus 32 retracts inward from the tip of the nozzle 30.
  • a part of the ink 27 is sucked into the pressure chamber 28 from the ink supply path 31, and the pressure chamber 28 accommodates a smaller amount of ink than its maximum volume.
  • the piezoelectric element 23 and the vibration plate 26 are dampingly vibrating as indicated by arrows 34 and 35.
  • the driving voltage has dropped from the maximum driving voltage VH to the intermediate driving voltage VM, so that the meniscus 32 force ⁇ has receded in the direction of the pressure chamber 28 compared to the conventional drawing method. Therefore, as shown in FIG. 8e, even when the piezoelectric element 23 and the vibration plate 26 move in the direction of the arrow 35 due to the damped vibration, the meniscus 32 does not protrude outside the nozzle 30. That is, the ink 27 in the nozzle 30 is forced to move to the tip side of the nozzle 30 by the surface tension.
  • the drive voltage applied to the piezoelectric element 23 is rapidly increased to the maximum drive voltage VH in a short time T4. Since the driving voltage is lowered to the intermediate drive voltage VM, the meniscus 32 is forcibly moved inward by the negative pressure of the pressure chamber 28, and the vibration is caused by the damping vibration of the piezoelectric element 23 and the diaphragm 26. The ink 27 does not overflow from the tip of the nozzle 30. Enough of this effect
  • the time T4 is preferably set to 300 s or less, more preferably from 200 s to 200 s.
  • the apparatus returns to the standby state shown in FIG. 8e.
  • the intermediate drive voltage VM is set between the highest drive voltage VH and the lowest drive voltage VL, and the piezoelectric elements 23 and 23 are placed in a standby state of the inkjet head.
  • the intermediate drive voltage VM is applied. This makes it possible to lower the position of the meniscus 32 by lowering the drive voltage from the intermediate drive voltage VM to the minimum drive voltage VL before ink ejection. Therefore, even when ink is continuously ejected, it is possible to sufficiently suppress the difference in the size of the ink droplet 33 between the first ejection and the second and subsequent ejections. .
  • the position of the meniscus 32 can be retracted in the direction of the pressure chamber 28, so that the piezoelectric element 23 Even if the diaphragm 26 has damped vibration, the meniscus 32 does not protrude from the tip of the nozzle 30 and does not stain the nozzle surface.
  • the minimum drive voltage VL is set to 0 volt or more as in the present embodiment, no negative voltage is applied to the piezoelectric element 23, so that the polarization of the piezoelectric element 23 is deteriorated due to the alternate application of the bipolar voltage. And a negative power supply is not required.
  • the method and apparatus for driving an ink jet head of the present invention can be used for any type of ink jet head that ejects ink by utilizing deformation of a piezoelectric element.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

La présente invention concerne un procédé et dispositif d'entraînement d'une tête d'impression à jet d'encre. Celle-ci est constituée d'un chambre pressurisée comportant un orifice d'admission de l'encre et une buse d'éjection de l'encre. Un diaphragme permet de faire varier le volume de la chambre pressurisée. Un élément piézo-électrique adapté pour déformer le diaphragme en fonction de la tension d'excitation appliquée à l'élément piézo-électrique, assure les fonction d'aspiration et d'éjection de l'encre dans et hors de la chambre pressurisée. Ce procédé fait intervenir un processus d'aspiration de l'encre dans la chambre pressurisée en appliquant une tension d'excitation minimale à l'élément piézo-électrique en attente lorsque la tension qui lui est appliquée est médiane. Le procédé fait également intervenir un procédé d'éjection de l'encre de la chambre pressurisée en appliquant une tension d'excitation maximale immédiatement après l'achèvement de la fonction d'aspiration. Enfin, le procédé comporte une phase de basculement de la fonction éjection à l'état d'attente, en appliquant une tension d'excitation médiane à l'élément piézo-électrique immédiatement après accomplissement de la fonction d'éjection, ce qui refait passer l'encre de la buse d'éjection vers la chambre pressurisée à l'encontre de sa tension superficielle.
PCT/JP1994/002105 1993-12-15 1994-12-14 Procede et dispositif d'entrainement d'une tete d'impression a jet d'encre WO1995016568A1 (fr)

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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5894242A (en) * 1995-10-23 1999-04-13 Rohm Co., Ltd. Drive IC for piezoelectric elements of ink jet printer
US6092886A (en) * 1996-07-05 2000-07-25 Seiko Epson Corporation Ink jet recording apparatus
US6217159B1 (en) 1995-04-21 2001-04-17 Seiko Epson Corporation Ink jet printing device
US8850477B2 (en) 1995-10-02 2014-09-30 Starsight Telecast, Inc. Systems and methods for linking television viewers with advertisers and broadcasters
US8863170B2 (en) 2000-03-31 2014-10-14 United Video Properties, Inc. System and method for metadata-linked advertisements
US8869204B2 (en) 1996-05-03 2014-10-21 Starsight Telecast, Inc. Method and system for displaying advertisements in an electronic program guide
US8904441B2 (en) 2003-11-06 2014-12-02 United Video Properties, Inc. Systems and methods for providing program suggestions in an interactive television program guide
US8918807B2 (en) 1997-07-21 2014-12-23 Gemstar Development Corporation System and method for modifying advertisement responsive to EPG information
US8931008B2 (en) 1999-06-29 2015-01-06 United Video Properties, Inc. Promotional philosophy for a video-on-demand-related interactive display within an interactive television application
US9015750B2 (en) 1998-05-15 2015-04-21 Rovi Guides, Inc. Interactive television program guide system for determining user values for demographic categories
US9021538B2 (en) 1998-07-14 2015-04-28 Rovi Guides, Inc. Client-server based interactive guide with server recording
US9071872B2 (en) 2003-01-30 2015-06-30 Rovi Guides, Inc. Interactive television systems with digital video recording and adjustable reminders
US9075861B2 (en) 2006-03-06 2015-07-07 Veveo, Inc. Methods and systems for segmenting relative user preferences into fine-grain and coarse-grain collections
US9113207B2 (en) 1995-10-02 2015-08-18 Rovi Guides, Inc. Systems and methods for contextually linking television program information
US9113107B2 (en) 2005-11-08 2015-08-18 Rovi Guides, Inc. Interactive advertising and program promotion in an interactive television system
US9125169B2 (en) 2011-12-23 2015-09-01 Rovi Guides, Inc. Methods and systems for performing actions based on location-based rules
US9147198B2 (en) 2013-01-10 2015-09-29 Rovi Technologies Corporation Systems and methods for providing an interface for data driven media placement
US9166714B2 (en) 2009-09-11 2015-10-20 Veveo, Inc. Method of and system for presenting enriched video viewing analytics
US9172987B2 (en) 1998-07-07 2015-10-27 Rovi Guides, Inc. Methods and systems for updating functionality of a set-top box using markup language
US9177081B2 (en) 2005-08-26 2015-11-03 Veveo, Inc. Method and system for processing ambiguous, multi-term search queries
US9294799B2 (en) 2000-10-11 2016-03-22 Rovi Guides, Inc. Systems and methods for providing storage of data on servers in an on-demand media delivery system
US9319735B2 (en) 1995-06-07 2016-04-19 Rovi Guides, Inc. Electronic television program guide schedule system and method with data feed access
US9326025B2 (en) 2007-03-09 2016-04-26 Rovi Technologies Corporation Media content search results ranked by popularity
US9426509B2 (en) 1998-08-21 2016-08-23 Rovi Guides, Inc. Client-server electronic program guide
WO2017094610A1 (fr) * 2015-11-30 2017-06-08 Seiko Epson Corporation Dispositif d'éjection de liquide et circuit de génération de signal de sélection d'éjection
US9736524B2 (en) 2011-01-06 2017-08-15 Veveo, Inc. Methods of and systems for content search based on environment sampling
US9749693B2 (en) 2006-03-24 2017-08-29 Rovi Guides, Inc. Interactive media guidance application with intelligent navigation and display features
US9848276B2 (en) 2013-03-11 2017-12-19 Rovi Guides, Inc. Systems and methods for auto-configuring a user equipment device with content consumption material
US10063934B2 (en) 2008-11-25 2018-08-28 Rovi Technologies Corporation Reducing unicast session duration with restart TV
US12120394B2 (en) 2007-11-21 2024-10-15 Rovi Guides, Inc. Maintaining a user profile based on dynamic data

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5542809A (en) * 1978-09-22 1980-03-26 Hitachi Ltd Ink jet recorder
JPS5962158A (ja) * 1982-09-30 1984-04-09 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション ドロツプオンデマンド式インクジエツトプリンタ
JPH01297257A (ja) * 1988-05-25 1989-11-30 Canon Inc インクジェット記録方法
JPH0477258A (ja) * 1990-07-18 1992-03-11 Seiko Epson Corp インクジェット式印字ヘッドの駆動法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5542809A (en) * 1978-09-22 1980-03-26 Hitachi Ltd Ink jet recorder
JPS5962158A (ja) * 1982-09-30 1984-04-09 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション ドロツプオンデマンド式インクジエツトプリンタ
JPH01297257A (ja) * 1988-05-25 1989-11-30 Canon Inc インクジェット記録方法
JPH0477258A (ja) * 1990-07-18 1992-03-11 Seiko Epson Corp インクジェット式印字ヘッドの駆動法

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US6217159B1 (en) 1995-04-21 2001-04-17 Seiko Epson Corporation Ink jet printing device
US6382754B1 (en) 1995-04-21 2002-05-07 Seiko Epson Corporation Ink jet printing device
US9319735B2 (en) 1995-06-07 2016-04-19 Rovi Guides, Inc. Electronic television program guide schedule system and method with data feed access
US9124932B2 (en) 1995-10-02 2015-09-01 Rovi Guides, Inc. Systems and methods for contextually linking television program information
US8850477B2 (en) 1995-10-02 2014-09-30 Starsight Telecast, Inc. Systems and methods for linking television viewers with advertisers and broadcasters
US9113207B2 (en) 1995-10-02 2015-08-18 Rovi Guides, Inc. Systems and methods for contextually linking television program information
US5894242A (en) * 1995-10-23 1999-04-13 Rohm Co., Ltd. Drive IC for piezoelectric elements of ink jet printer
US8869204B2 (en) 1996-05-03 2014-10-21 Starsight Telecast, Inc. Method and system for displaying advertisements in an electronic program guide
US6092886A (en) * 1996-07-05 2000-07-25 Seiko Epson Corporation Ink jet recording apparatus
US8918807B2 (en) 1997-07-21 2014-12-23 Gemstar Development Corporation System and method for modifying advertisement responsive to EPG information
US9015749B2 (en) 1997-07-21 2015-04-21 Rovi Guides, Inc. System and method for modifying advertisement responsive to EPG information
US9015750B2 (en) 1998-05-15 2015-04-21 Rovi Guides, Inc. Interactive television program guide system for determining user values for demographic categories
US9635406B2 (en) 1998-05-15 2017-04-25 Rovi Guides, Inc. Interactive television program guide system for determining user values for demographic categories
US9172987B2 (en) 1998-07-07 2015-10-27 Rovi Guides, Inc. Methods and systems for updating functionality of a set-top box using markup language
US9154843B2 (en) 1998-07-14 2015-10-06 Rovi Guides, Inc. Client-server based interactive guide with server recording
US9055318B2 (en) 1998-07-14 2015-06-09 Rovi Guides, Inc. Client-server based interactive guide with server storage
US10075746B2 (en) 1998-07-14 2018-09-11 Rovi Guides, Inc. Client-server based interactive television guide with server recording
US9232254B2 (en) 1998-07-14 2016-01-05 Rovi Guides, Inc. Client-server based interactive television guide with server recording
US9055319B2 (en) 1998-07-14 2015-06-09 Rovi Guides, Inc. Interactive guide with recording
US9021538B2 (en) 1998-07-14 2015-04-28 Rovi Guides, Inc. Client-server based interactive guide with server recording
US9118948B2 (en) 1998-07-14 2015-08-25 Rovi Guides, Inc. Client-server based interactive guide with server recording
US9226006B2 (en) 1998-07-14 2015-12-29 Rovi Guides, Inc. Client-server based interactive guide with server recording
US9426509B2 (en) 1998-08-21 2016-08-23 Rovi Guides, Inc. Client-server electronic program guide
US8931008B2 (en) 1999-06-29 2015-01-06 United Video Properties, Inc. Promotional philosophy for a video-on-demand-related interactive display within an interactive television application
US8863170B2 (en) 2000-03-31 2014-10-14 United Video Properties, Inc. System and method for metadata-linked advertisements
US10015562B2 (en) 2000-03-31 2018-07-03 Rovi Guides, Inc. System and method for metadata-linked advertisements
US9294799B2 (en) 2000-10-11 2016-03-22 Rovi Guides, Inc. Systems and methods for providing storage of data on servers in an on-demand media delivery system
US9369741B2 (en) 2003-01-30 2016-06-14 Rovi Guides, Inc. Interactive television systems with digital video recording and adjustable reminders
US9071872B2 (en) 2003-01-30 2015-06-30 Rovi Guides, Inc. Interactive television systems with digital video recording and adjustable reminders
US8904441B2 (en) 2003-11-06 2014-12-02 United Video Properties, Inc. Systems and methods for providing program suggestions in an interactive television program guide
US10986407B2 (en) 2003-11-06 2021-04-20 Rovi Guides, Inc. Systems and methods for providing program suggestions in an interactive television program guide
US10880607B2 (en) 2003-11-06 2020-12-29 Rovi Guides, Inc. Systems and methods for providing program suggestions in an interactive television program guide
US9191719B2 (en) 2003-11-06 2015-11-17 Rovi Guides, Inc. Systems and methods for providing program suggestions in an interactive television program guide
US9177081B2 (en) 2005-08-26 2015-11-03 Veveo, Inc. Method and system for processing ambiguous, multi-term search queries
US9113107B2 (en) 2005-11-08 2015-08-18 Rovi Guides, Inc. Interactive advertising and program promotion in an interactive television system
US9075861B2 (en) 2006-03-06 2015-07-07 Veveo, Inc. Methods and systems for segmenting relative user preferences into fine-grain and coarse-grain collections
US9128987B2 (en) 2006-03-06 2015-09-08 Veveo, Inc. Methods and systems for selecting and presenting content based on a comparison of preference signatures from multiple users
US10984037B2 (en) 2006-03-06 2021-04-20 Veveo, Inc. Methods and systems for selecting and presenting content on a first system based on user preferences learned on a second system
US9092503B2 (en) 2006-03-06 2015-07-28 Veveo, Inc. Methods and systems for selecting and presenting content based on dynamically identifying microgenres associated with the content
US9749693B2 (en) 2006-03-24 2017-08-29 Rovi Guides, Inc. Interactive media guidance application with intelligent navigation and display features
US9326025B2 (en) 2007-03-09 2016-04-26 Rovi Technologies Corporation Media content search results ranked by popularity
US10694256B2 (en) 2007-03-09 2020-06-23 Rovi Technologies Corporation Media content search results ranked by popularity
US12120394B2 (en) 2007-11-21 2024-10-15 Rovi Guides, Inc. Maintaining a user profile based on dynamic data
US10063934B2 (en) 2008-11-25 2018-08-28 Rovi Technologies Corporation Reducing unicast session duration with restart TV
US9166714B2 (en) 2009-09-11 2015-10-20 Veveo, Inc. Method of and system for presenting enriched video viewing analytics
US9736524B2 (en) 2011-01-06 2017-08-15 Veveo, Inc. Methods of and systems for content search based on environment sampling
US9125169B2 (en) 2011-12-23 2015-09-01 Rovi Guides, Inc. Methods and systems for performing actions based on location-based rules
US9147198B2 (en) 2013-01-10 2015-09-29 Rovi Technologies Corporation Systems and methods for providing an interface for data driven media placement
US9848276B2 (en) 2013-03-11 2017-12-19 Rovi Guides, Inc. Systems and methods for auto-configuring a user equipment device with content consumption material
CN108290412A (zh) * 2015-11-30 2018-07-17 精工爱普生株式会社 液体喷射装置和喷射选择信号产生电路
TWI641501B (zh) * 2015-11-30 2018-11-21 精工愛普生股份有限公司 液體噴射裝置及噴射選擇信號產生電路
WO2017094610A1 (fr) * 2015-11-30 2017-06-08 Seiko Epson Corporation Dispositif d'éjection de liquide et circuit de génération de signal de sélection d'éjection

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