WO1997037852A1 - Procede d'entrainement pour tete d'ecriture a jet d'encre - Google Patents
Procede d'entrainement pour tete d'ecriture a jet d'encre Download PDFInfo
- Publication number
- WO1997037852A1 WO1997037852A1 PCT/JP1997/001238 JP9701238W WO9737852A1 WO 1997037852 A1 WO1997037852 A1 WO 1997037852A1 JP 9701238 W JP9701238 W JP 9701238W WO 9737852 A1 WO9737852 A1 WO 9737852A1
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- WIPO (PCT)
- Prior art keywords
- recording head
- driving
- ink jet
- duration
- period
- Prior art date
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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
- B41J2/04516—Control methods or devices therefor, e.g. driver circuits, control circuits preventing formation of satellite drops
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- 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 provides an ink jet recording head that uses a piezoelectric vibrator as an actuator to obtain print quality equivalent to that of a photograph using minute ink droplets by using an ink jet recording head. Drive technology.
- the ink jet recording head can easily print a color image by preparing multiple colors of ink, but if you try to print an image similar to a photograph, the size of the dot itself will be reduced. In addition, in order to minimize the bleeding of the ink between adjacent dots, it is essential to minimize the amount of ink of the ink droplet.
- a technique for forming minute dots by an ink jet recording head is disclosed in, for example, Japanese Patent Publication No. 4-36071, as shown in FIG. ,
- the meniscus is rapidly withdrawn from the nozzle opening, causing Helmholtz resonance torsion in the meniscus.
- Droplets are ejected, then the meniscus is freely oscillated by a second signal S2 that keeps a substantially constant voltage, and finally the meniscus is returned to a position suitable for ejecting the next ink droplet by a third signal S3. .
- FIG. 20 shows the state of the meniscus after ejection of ink droplets suitable for printing by application of the first signal S 1, in which the period T c of Helmholtz resonance oscillation is expressed in units of time, and the symbol M is Helmholtz.
- the symbol M ' indicates the displacement of the meniscus itself, which vibrates at a very long period Tm, with the displacement of the meniscus superimposed on the resonance vibration.
- the Helmholtz resonance oscillation oscillates, and Helmholtz resonance oscillation having the period Tc occurs on the meniscus.
- This Helmholtz resonance oscillation occurs in a state where the meniscus natural oscillation M, which is displaced at the period Tm, is more important. Therefore, when the natural vibration M ′ of the meniscus itself approaches the nozzle opening, a part of the meniscus rises greatly from the nozzle opening surface due to the peaks P 1 ′, P 2 ′, and P 3 ′ of Helmholtz resonance vibration, and a part thereof Are separated as small ink droplets, that is, satellites and ink mist. Such satellite-ink mist is particularly prominent in a high-temperature environment where the viscosity of the ink is reduced.
- An object of the present invention is to solve such a problem, and an ink amount is reduced as small as possible without causing unnecessary minute ink droplets after ejection of ink droplets.
- An object of the present invention is to propose a method of driving an ink jet recording head capable of discharging ink droplets suitable for forming a dot at a high driving frequency. Disclosure of the invention
- a method of driving an ink jet recording head includes a pressure generating chamber communicating with a reservoir via a nozzle opening and an ink supply port and having a Helmholtz resonance frequency of a cycle Tc;
- a driving method for an ink jet recording head comprising a piezoelectric vibrator for expanding and contracting
- a first step of expanding the pressure generating chamber more preferably a method of driving an ink jet recording head for ejecting an ink droplet suitable for printing by oscillating oscillation at a Helmholtz resonance frequency;
- the meniscus is restored by minimizing the vibration of the meniscus as much as possible. Prevents satellite-ink mist from occurring. In this way, by suppressing the vibration of the meniscus, the decay time of the meniscus can be shortened, and printing can be performed at the driving frequency.
- FIG. 1 is an assembled perspective view showing an embodiment of an ink jet recording head used in the present invention
- FIG. 2 is a view showing a cross-sectional structure of the recording head.
- FIG. 3 is a signal waveform diagram showing a first embodiment of a method of driving an ink jet recording head
- FIGS. 4 (I) to (VI) each show a meniscus by the driving method of the first embodiment
- FIG. 5 is a diagram showing the relationship between the duration of the second signal and the flying speed of the ink droplet
- FIG. 6 is a diagram showing the relationship between the duration of the second signal and the ink droplet.
- FIG. 7 is a diagram showing a relationship with weight
- FIG. 7 is a diagram showing a temporal change of a meniscus position after ink droplet ejection by the driving method of the first embodiment and the conventional driving method.
- FIG. 8 is a signal waveform diagram showing another embodiment using the principle of the above embodiment.
- FIG. 9 is a signal waveform diagram showing a second embodiment of the method of driving the ink jet recording head, and FIGS. 10 (I) to (VI) each show a signal of the second embodiment.
- FIG. 11 is a view showing the behavior of a meniscus according to the driving method.
- FIG. 12 is a diagram showing a temporal change in the position of a residue.
- FIG. 12 is a graph showing the change in the ink droplet ejection characteristics in the driving method according to the second embodiment in relation to the voltage of the first signal and the connection time.
- FIG. 13 is a diagram showing the relationship between the ratio of the time gradient of the second signal to the time gradient of the first signal, and the speed of ink droplets and the ink weight.
- FIG. 14 is a signal waveform diagram showing a third embodiment of the method of driving the ink jet recording head
- FIG. 15 is a diagram showing the ink droplets obtained by the driving method of the third embodiment and the conventional driving method.
- FIG. 3 is a diagram showing a temporal change in a position of a meniscus after ejection.
- FIG. 16 is a signal waveform diagram showing a fourth embodiment of the ink jet recording head driving method
- FIGS. 17 (I) to (VI) each show the driving method of the fourth embodiment.
- FIG. 18 (a) is a diagram showing the displacement of the meniscus when the first signal is applied
- FIG. 18 (b) is a diagram showing the displacement of the meniscus when the first signal is applied.
- FIG. 18 is a diagram showing the displacement of the meniscus when a signal is applied
- FIG. 18 (c) is a diagram showing the displacement of the meniscus when the first to fifth signals are applied.
- (D) is a diagram showing the displacement of the meniscus by the conventional driving method.
- FIG. 19 is a waveform diagram showing an example of a driving signal used in a conventional driving method
- FIG. 20 is a diagram showing displacement of a meniscus.
- FIGS. 1 and 2 show an embodiment of an ink jet type recording head used in the present invention.
- the ink flow path unit 1 includes a pressure generating chamber 2 and a reservoir 3.
- a nozzle 5 having a nozzle opening 6 communicating with the pressure generating chamber 2;
- An elastic plate 8 elastically deformed by receiving the displacement of the piezoelectric vibrator is sealed with a nozzle plate 7 on the side of the spacer 5 serving as the front surface, and sealed with an elastic plate 8 on the back surface. ing.
- the pressure generating unit 10 is arranged in accordance with the arrangement pitch of the pressure generating chambers 2, and the piezoelectric vibrator 11 that expands and contracts in a direction perpendicular to the surface of the elastic plate 8 can be displaced from the fixed substrate 1. It is fixed to 2.
- the piezoelectric vibrator 11 is formed by alternately stacking the piezoelectric material 11a and the conductive materials 11b and 11c, which are different poles, in parallel with the direction of expansion and contraction. It is configured as a so-called longitudinal vibration mode resonator, which contracts in the direction perpendicular to the lamination direction and expands in the direction perpendicular to the conductive layer when electric charge is discharged.
- the ink flow unit 1 is fixed to the upper end 14 of the holder 13, and the pressure generating unit 10 is oriented so that the tip of the piezoelectric vibrator 11 faces each pressure generating chamber 2.
- the fixed substrate 12 is fixed to the holder 13 to form an ink jet recording head.
- Reference numerals 16 and 16 in the figure denote through holes for connecting the ink supply channels 17 and 17 connected to the external ink container and the reservoirs 3 and 3, respectively.
- the piezoelectric vibrator 11 when a signal whose voltage rises with time is applied to the piezoelectric vibrator 11, the piezoelectric vibrator 11 is charged and contracts with time. Due to this contraction, the elastic plate 8 is elastically deformed so as to separate from the spacer 5 and expands the pressure generating chamber 2. The expansion of the pressure generating chamber 2 causes the ink in the reservoir 3 to flow into the pressure generating chamber 2 via the ink supply port 4, and the meniscus formed in the nozzle opening 6 to be drawn into the pressure generating chamber. Then, when the signal is maintained at a predetermined level, the meniscus vibrates so as to reciprocate between the nozzle opening 6 and the pressure generating chamber 2 by its own natural oscillation period.
- the piezoelectric vibrator 11 when the electric charge of the piezoelectric vibrator 11 in the charged state is discharged, the piezoelectric vibrator 11 elongates temporally and pushes the elastic plate 8 back to the spacer side, and the volume of the pressure generating chamber 2 is increased. To shrink. Since the ink in the pressure generation chamber 2 is pressurized by the contraction of the pressure generation chamber 2, the vibrating meniscus is pushed back to the nozzle opening 2 side.
- the ink jet recording head thus configured has a fluid compliance due to the compressibility of the ink of the pressure generating chamber 2 as Ci, an elastic plate 8 forming the pressure generating chamber 2, and a nozzle plate.
- the rigidity compliance of the material such as 7 is Cv
- the inertance of the nozzle opening 6 is Mn
- the inertance of the ink supply port 4 is MS
- the frequency f of Helmholtz resonance vibration of the pressure generation chamber 2 is Is shown.
- Tm 2 ⁇ X V " ⁇ (Mn + MS) C n ⁇
- the fluid compliance Ci is expressed by the following equation.
- the ink jet recording head thus configured has a fluid compliance C i of 5 ⁇ 10-21 m5N-l, a rigidity compliance C v of 5 ⁇ 10-21 m5N-l, and an inertance Mn of the nozzle opening 6.
- the inertia MS of the ink supply port 4 is configured to have various characteristics of 1 X 108 kg m-4, the piezoelectric vibrator 11 is formed into a meniscus by extension and contraction.
- the period T c 4. Helmholtz resonance oscillation of 4 ⁇ s (225 kHz) is generated.
- the spacers constituting the flow paths are formed by etching single crystal silicon having a high elastic modulus to form very fine and precise flow paths. 2
- the rigidity compliance CV can be reduced, and the period Tc of Helmholtz resonance oscillation can be easily reduced to 10 ⁇ s or less.
- the piezoelectric vibrator 11 in the longitudinal vibration mode configured as described above is accurately displaced in response to an applied signal,
- the pressure generating chamber 2 can be expanded and contracted in a shorter time than the oscillation cycle.
- FIG. 3 shows an embodiment of a signal used in the driving method of the present invention.
- a first signal S 11 is applied to the piezoelectric vibrator 11 to contract the piezoelectric vibrator 11,
- the elastic plate 8 is elastically deformed in a direction away from the pressure generating chamber 2 and the ridge of the pressure generating chamber 2 expands.
- the meniscus that was stationary near the nozzle opening (Fig. 4 (I)) was drawn into the nozzle opening 6 by the negative pressure due to the expansion of the pressure generating chamber 2 (Fig. 4 ( ⁇ )).
- the ink in the reservoir 3 flows into the pressure generating chamber 2 from the ink supply port 4.
- the pressure generating chamber 2 stops expanding and has a constant capacity. Since the ridge is maintained, the pressure of the ink that has been pressed into the pressure generating chamber 2 in the above-described process is rapidly released. Therefore, the nozzle opening 6 The meniscus drawn into the section starts oscillation HI at the Helmholtz resonance oscillation cycle Tc, and moves toward the nozzle opening side. In other words, Helmholtz resonance oscillation with a period Tc is excited in the meniscus (Fig. 4 ( ⁇ )).
- the third signal S 13 is applied to the piezoelectric vibrator 11 to release a part of the electric charge charged by the first signal S 11, and the piezoelectric vibrator 1 1 expands, and the volume of the pressure generating chamber 2 contracts with time. Due to this contraction, the meniscus in which Helmholtz resonance oscillation having a period T c is prolonged due to the third signal S 13 is pushed toward the neutral line N—N of the oscillation toward the outlet of the nozzle opening 6. Only the peak due to Helmholtz resonance oscillation of the period Tc superimposed on the meniscus protrudes outside the nozzle opening 6 (Fig.
- the ink droplet D separates from the meniscus and flies ( 4 (V)).
- the ink droplet D pressurizes the pressure generating chamber 2 by the piezoelectric vibrator 11, and the ink amount is smaller than the ink amount of the ink droplet ejected from the nozzle opening 6 directly by the applied pressure.
- the fifth signal S 15 is applied to the piezoelectric vibrator 11 whose extension operation has been stopped by the fourth signal S 14, and the residual charge of the piezoelectric vibrator 11 Is discharged again, the piezoelectric vibrator 11 expands, the volume of the pressure generating chamber 2 decreases, and a positive pressure is generated in the pressure generating chamber 2.
- Helmholtz resonance oscillation H 2 having a period T c oscillates toward the tip of the nozzle opening 6 (FIG. 4 (VI)).
- the fifth signal S 15 is adjusted by adjusting the continuous time T 14 of the fourth signal S 14 to adjust the timing of the application of the fifth signal S 15.
- the meniscus is drawn into the nozzle orifice 6, but due to the surface tension of the meniscus and ringing of the Helmholtz resonance cycle T c, the pressure is generated from the ink supply port 4 to the pressure generating chamber 2. Ink flows into. Therefore, even if the piezoelectric vibrator 11 is in a stationary state, the meniscus in which Helmholtz resonance vibration of the period T c remains moves toward the nozzle opening 6 again, and finally becomes In the same manner as when the ink droplet is ejected, the superposed Helmholtz resonance vibration peak is separated to generate a minute ink droplet.
- the Helmholtz resonance vibration is oscillated so as to have an opposite phase to the Helmholtz resonance vibration of the periodic c that is superimposed on the meniscus after the ink is ejected by the fifth signal S15. Therefore, the residual vibration component of the Helmholtz resonance vibration having a period Tc that is usefully used for discharging the ink droplets for printing is suppressed, and the generation of useless ink droplets is prevented.
- the Helmholtz resonance vibration of the meniscus is reduced in the region where the duration T12 of the second signal S12 is equal to or less than 1/2 of the period Tc of the Helmholtz resonance vibration. Since the nozzle is pushed to the nozzle opening side by the third signal S13, it has a speed ⁇ or more suitable for printing. Ink droplets can be generated.
- the duration T 12 of the second signal S 12 is longer than 1 ⁇ 2 of the period T c of Helmholtz resonance oscillation, the speed of the ink drops is reduced, and the printing becomes impossible due to flight bending and the like. become.
- the duration T 12 of the second signal S 12 is set to a time shorter than 1 Z 2 of the Helmholtz resonance vibration period c, the maximum charging voltage of the piezoelectric vibrator 11 is reduced.
- the flying speed of the ink droplets can be maintained at a speed ⁇ suitable for printing.
- driving at a low voltage leads to a low amplitude of the Helmholtz resonance vibration, so that it is possible to prevent the generation of satellites due to the residual vibration of the meniscus after ejecting the ink droplets for printing.
- the first signal S 1 (FIG. 19) is set so that the curve A in FIG. 5 is obtained, and the duration T 3 of the third signal S 3 is set to the Helmholtz resonance.
- the vibration period was set to about Tc and the meniscus was slowly pushed toward the nozzle opening side by the third signal S3, the satellites of the flight speeds indicated by symbols C and D in FIG. Has occurred.
- driving at a low voltage can reduce the amplitude of Helmholtz resonance vibration, shortening the decay time of residual meniscus vibration, shortening the time until the next ink droplet can be ejected, and increasing the frequency. Driving, that is, high-speed printing is possible.
- the firing time T12 of the second signal S12 is set to be equal to or less than 12 of the period Tc of the Helmholtz resonance vibration
- the Helmholtz resonance vibration of the meniscus is pushed to the nozzle opening side by the third signal S13.
- the duration T 12 of the second signal S 12 is longer than 1 ⁇ 2 of the period T c of Helmholtz resonance oscillation, the Helmholtz resonance of the meniscus occurs. Because the vibration is in the opposite phase to the above, It will not function as a boost. In view of this, it is desirable to set the duration of the second signal S12 to be equal to or less than 1/2 of the period Tc of the Helmholtz resonance oscillation.
- the duration T 12 of the second signal S 12 is set to be equal to or less than 1/2 of the period T c of the Helmholtz resonance oscillation, the amount of ink droplets ejected due to the meniscus being pushed by the third signal S 13 Changes.
- FIG. 6 shows the relationship between the duration T 12 of the second signal S 12 and the ink weight of the ejected ink droplets.
- the duration T 12 of the second signal S 12 is shown in FIG. It can be seen that the weight of the ejected ink droplets can be easily adjusted by changing the Helmholtz resonance oscillation period Tc within a range of 1 to 2 or less.
- the figure shows the case where the ink droplet is ejected and left as it is.
- symbols P 11, ⁇ 12, ⁇ 13,..., And ⁇ 1 ⁇ P 12 ′ P 13 ′,... Indicate that Helmholtz resonance vibration with a period T c superimposed on the meniscus causes The peak position S from the chamber 2 toward the nozzle opening 6 is shown.
- the timing is adjusted to the time when P 1 1, P 12 ′, P 13 ′, and “ ⁇ ” ⁇ occur.
- the fifth signal S15 which continues for a period of time, is set to the time of the fourth signal S14 so that it coincides with the time of TcX2 from the start of the application of the first signal SI1, that is, the time when the peak P11 'occurs.
- the width T14 is adjusted and applied.
- the duration T11 of the first signal S11 is shorter than the period Tc of the Helmholtz resonance oscillation, preferably 1 to 2 or less of the period Tc of the Helmholtz resonance oscillation, more preferably the natural oscillation of the piezoelectric oscillator 11
- the piezoelectric vibrator 11 1 is rapidly contracted and the pressure generating chamber 2 is rapidly expanded, whereby the meniscus is rapidly drawn into the pressure generating chamber 2 from the nozzle opening 6.
- the Helmholtz resonance vibration of the meniscus periodic c is assisted to eject the ink droplet.
- the flying speed of the ink droplet is not reduced to a speed ⁇ or less suitable for printing, and the first signal S 1
- the amount of expansion of the pressure generating chamber 2 due to 1 can be reduced to generate minute ink droplets at a speed suitable for printing.
- the third signal S 13 has a duration T 13 equal to or longer than the period T c of the Helmholtz resonance vibration, preferably not to unnecessarily amplify the Helmholtz resonance vibration excited by the first signal S 11.
- the period is set to substantially the same value as the period Tc of the Helmholtz resonance oscillation.
- the elapsed time from the start of the first signal S11 is an integral multiple of the period Tc of Helmholtz resonance oscillation, but there is no effect on the ejection ink droplet.
- the period Tc of the Helmholtz resonance vibration is twice as long as the application of the first signal S11. It is desirable to apply the voltage when the time has elapsed.
- the duration T 15 is the Helmholtz resonance vibration. It is desirable to be shorter than the period T c, specifically, to match the continuation time T 11 of the first signal S 11, which is almost the same as the Helmholtz resonance oscillation of the period T c by the first signal S 11 Helmholtz resonance vibration can be induced to significantly enhance the damping effect.
- the fifth signal S15 has such a voltage change that the residual vibration of the Helmholtz resonance vibration can be suppressed, and the magnitude of the fifth signal S15 is such that the ink droplet is not unnecessarily ejected even by the application of the bracket signal S15.
- the amount of extension of the piezoelectric vibrator 11 due to the three signals S 13 must be within a range that can secure a voltage change that can generate an ink droplet suitable for printing.
- the voltage change of the fifth signal S15 is desirably set to 0.2 to 0.8 times the voltage change of the first signal S11.
- the Helmholtz resonance vibration after ink droplet ejection is If the residual vibration cannot be sufficiently suppressed and, on the other hand, is larger than 0.8 times, the meniscus cannot be effectively boosted because the voltage change of the third signal S13 becomes small, and the ink is not effectively boosted. Drops cannot be ejected.
- the durations T 11, T 11 of the first signal S 11, the second signal S 12, and the fifth signal S 15 12 and ⁇ 15 are respectively 0% to 50% of the period Tc of the Helmholtz resonance oscillation, and the continuous time 13 of the third signal S13 is longer than the period Tc of the Helmholtz resonance oscillation.
- Long preferably substantially equal to the period T c of the Helmholtz resonance oscillation, and the duration ⁇ 14 of the fourth signal S 14 is the fifth signal S 15 from the start of application of the first signal S 11.
- the time elapsed until the start of the voltage application is a value that is an integral multiple of the period Tc of Helmholtz resonance oscillation, and preferably twice the period Tc of Helmholtz resonance oscillation, and the voltage change of the fifth signal S15 is 20% to 80% of the voltage change of one signal S11.
- the fourth signal S 14 for holding the piezoelectric vibrator 11 charged to the maximum voltage in a state where the pressure generating chamber 2 is expanded to the maximum, that is, for holding the piezoelectric vibrator 11 in the middle in a constant state is used.
- the two signals S 13 and S 15 are applied between them, and the discharge is divided into two and the discharge is performed.Helmholtz resonance vibration by the fifth signal cancels the vibration remaining in the meniscus, but the second signal S If 1 2 is set shorter than 1 no 2 of the Helmholtz resonance vibration period c, as described above, it is possible to prevent the occurrence of unnecessary ink droplets such as ink mist after the ejection of ink droplets suitable for printing. As shown in FIG.
- FIG. 9 shows a second embodiment of the present invention, in which In a state where the meniscus M is substantially stationary near the tip (FIG. 10 (I)), the first signal S that changes substantially linearly from the voltage V 0 to the voltage V 9 at the connection time T 21.
- the Helmholtz resonance vibration of the period T c superimposed on the meniscus is not affected by the slow expansion of the pressure generating chamber 2 and the nozzle opening 6 is vibrated by the vibration of the inherent vibration period T m having a long period of the meniscus itself.
- the neutral line NN of the vibration is moved to the pressure generating chamber side (Fig. 10 (IV)).
- a part of the tip area of the meniscus protrudes due to Helmholtz resonance vibration superimposed on the meniscus and separates as an ink droplet having a small ink amount suitable for printing (No. 10 (V)), it flies toward a recording medium (not shown).
- the pressure generating chamber 2 is expanded by applying the second signal S22 that slowly contracts the piezoelectric vibrator 11, so that the meniscus is superimposed on the meniscus.
- the Helmholtz resonance vibration itself with the period Tc is almost unaffected by the negative pressure due to the expansion of the pressure generating chamber 2, and only the neutral line N of the meniscus is displaced from the nozzle opening 6 toward the pressure generating chamber.
- the peak of the meniscus swelling from the tip of the chirping opening 6 can be suppressed to a small value. Therefore, the amount of ink droplets correlated with the amount of meniscus protrusion is reduced, and ink droplets suitable for high-density graphic printing can be ejected.
- a second signal S22 which changes the voltage from V9 to V10, is applied to slowly expand the volume of the pressure generating chamber 2, so that the ink is separated as an ink droplet suitable for printing and ejected.
- the rear end of the meniscus which is present at the nozzle opening side slower than the region, is pulled back toward the nozzle opening side, and the shape of the ink droplet is shaped into a sphere, and the generation of satellite is also prevented (No. 10). ( Figure (VI)).
- the Helmholtz resonance oscillation of the period Tc continues after the ink droplet D is formed, so that the Helmholtz resonance oscillation starts from the start of the application of the first signal S21.
- the volume expansion of the pressure generating chamber 2 is continued by the second signal S 22.
- the peaks P 21, P 22, P 23, ⁇ at the point of an integral multiple of the Helmholtz resonance oscillation period T c from the start of S 21 application are: Due to the neutral line N 'drawn into the pressure generating chamber side from the neutral line N' of the meniscus vibration in the conventional driving method which does not involve the expansion of the pressure generating chamber 2, it protrudes from the nozzle opening 6. Since the state does not occur, generation of unnecessary ink droplets such as satellites is more reliably prevented.
- a third signal S23 which changes substantially linearly from the voltage V10 to the voltage V0 in a time width T23, is applied to the piezoelectric vibrator 11, and the The vibrator 11 is slowly extended to slowly reduce the volume of the pressure generating chamber 2.
- the meniscus moves its position in a direction that fills the nozzle opening 6 with the damping vibration of the period Tc, and returns to a position suitable for the next ink droplet ejection.
- the Helmholtz resonance vibration of the periodic c that is superimposed on the meniscus has been sufficiently attenuated, and therefore there is no possibility that the ink mist will scatter.
- the duration T 21 of the first signal S 21 is shorter than the period T c of the Helmholtz resonance oscillation, preferably 1 Z 2 or less of the period T c, and more preferably a piezoelectric vibrator. 11 Set to less than the natural vibration period of 1.
- the meniscus after the formation of the ink droplets is surely positioned within the nozzle opening 6 in order to prevent the occurrence of ink mist from the viewpoint of preventing the occurrence of ink mist. Therefore, it is desirable that the sum T 21 + T 22 of the durations of the first signal S 21 and the second signal S 22 be set to be equal to or longer than the Helmholtz resonance oscillation period T c.
- the duration T22 of the second signal S22 is set to be equal to or longer than the period Tc of the Helmholtz resonance oscillation. .
- the duration T22 of the second signal S22 is set to be at least twice the period Tc of the Helmholtz resonance oscillation, the period Tc2 of the Helmholtz resonance oscillation from the start of the application of the first signal S21 Generates the highest ink mist at the point of time when the time has elapsed.Peak peak P 21 can be kept inside nozzle opening 6. Become.
- the duration T23 of the third signal S23 is set to a length equal to or longer than the period Tc of Helmholtz resonance vibration, and desirably the same value as the period Tc of Helmholtz resonance vibration, Helmholtz resonance vibration is applied to the meniscus. It can be quickly returned to the tip of the nozzle opening 6 without being induced.
- the ink jet recording head has an ink supply port for the ink supply port so that the meniscus returns to a position suitable for discharging the next ink droplet promptly after discharging the ink droplet along with the vibration of the period Tm.
- the inertance MS is set to the same value as the inertance Mn (lX108 kg m-4) of the nozzle opening 6.
- the pressure generating chamber 2 can be maintained in the expansion process by the second signal S22 in the ink droplet discharging process, the recording head having the ink supply port formed so as to increase the meniscus return speed. Even after ejection of ink droplets Unnecessary ink droplet ejection can be prevented, and an ink jet recording apparatus having high print quality and high drive frequency response can be realized.
- FIG. 12 is a diagram showing the ink ejection characteristics of the above-mentioned ink jet recording head, and is a lower right region in the figure from a limit curve A for ejecting an ink droplet by applying the first signal S 21.
- FIG. 12 In (arrow C), the region where ink droplets are spontaneously ejected only by applying the first signal S 21 to the piezoelectric vibrator 11 is shown. Only the application of one signal S21 represents a boundary region where ink droplets are not spontaneously ejected.
- the negative signal is applied in the direction in which the meniscus after the ejection of the ink droplet suitable for printing is drawn into the nozzle opening 6 by applying the second signal S 22, so that the limiting curve No ink mist is observed in the territory indicated by arrow E from B. Therefore, it is possible to eject ink droplets that fly at high speed with a small amount of ink, and 2 ng of ink according to experimental data and a flight speed of 1 Om / S.
- Fig. 13 shows the ratio of the time gradient of the second signal S22 to the time gradient of the first signal S21, the flying speed of the ink droplet (curve A in the figure), and the ink weight (curve B in the figure). ), And as is clear from the figure, if the ratio exceeds 50%, no ink droplet is ejected, so the second signal S 2 The time gradient of 2 needs to be 50% or less at most of the time gradient of the first signal S21. Also, if the time gradient of the first signal S21 is fixed and only the time gradient of the second signal S22 is changed, the ink amount of the ink droplet can be changed without affecting the flying speed of the ink droplet. This makes it possible to form an image with excellent gradation.
- FIG. 14 shows a third embodiment of the present invention.
- a specific voltage V 60 is previously applied to the piezoelectric vibrator 11 in a standby state.
- a step for keeping the volume of the pressure generating chamber constant is provided between the step of minutely expanding the pressure generating chamber and the step of returning the meniscus.
- the piezoelectric After the end of the first signal S31, when the second signal S32, whose voltage changes slowly and linearly from the voltage V69 to the voltage V70 for a duration T32, is applied, the piezoelectric The contraction of the oscillator 11 switches from a rapid displacement rate to a contraction with a slow displacement rate, and the volume change of the pressure generating chamber 2 switches to a slow expansion.
- the meniscus has a Helmholtz resonance vibration having a period Tc superimposed thereon, is hardly affected by the slow expansion of the pressure generating chamber 2, and has a longer period of the meniscus itself. Move in the direction. Then, in the process of slowly moving to the nozzle opening 6, the tip region of the Helmholtz resonance vibration having a period Tc superimposed on the meniscus is projected. The ink is ejected and separated as a small ink droplet suitable for printing, and flies toward the recording medium.
- the pressure generating chamber 2 is expanded by applying the second signal S 32 that causes the piezoelectric vibrator 11 to contract slowly, and is superimposed on the meniscus.
- the Helmholtz resonance vibration itself having the period Tc is not affected by the negative pressure due to the expansion of the pressure generating chamber 2, and only the neutral line of the meniscus is displaced from the nozzle opening 6 toward the pressure generating chamber. Therefore, compared to the conventional driving method, the ink droplet is located inside the tip of the nozzle opening 6, and the ink amount of the ink droplet correlated with the amount of protrusion of the meniscus is reduced, which is suitable for high-density graphic printing. Drops can be ejected.
- the third signal S33 that maintains the final charging voltage V70 for the duration T33 is applied, and the piezoelectric vibrator 11 remains contracted. That is, the pressure generating chamber 2 is maintained in a fully expanded state. As a result, as shown in FIG. 15, the neutral line N of the meniscus that vibrates at Helmholtz resonance with the period Tc is not pushed out like the neutral line N ′ of the meniscus in the conventional driving method.
- the fourth signal S34 that changes substantially linearly from the voltage V70 to the voltage V60 in the time width T34 is applied to the piezoelectric vibrator 11.
- the piezoelectric vibrator 11 is extended slowly to decrease the volume of the pressure generating chamber 2 slowly. At this point, no ink mist occurs because the vibration of the meniscus is sufficiently attenuated by the third signal S33.
- the piezoelectric vibrator in the stopped state, is slightly contracted, that is, the pressure generating chamber 2 is slightly expanded in advance.
- the piezoelectric vibrator 11 in the contracted state expands, and the volume of the pressure generating chamber 2 is substantially contracted, and the pressure is reduced.
- the generation chamber 2 is pressurized, the meniscus rises to the extent that ink droplets are not ejected from the nozzle openings 6 (Fig. 17 (II)).
- the voltage change of the first signal S41 is large, the meniscus will be greatly pushed out and ink droplets will be generated, so the voltage of the first signal S41 is set to a size that does not eject ink droplets. Have been.
- the meniscus extruded out of the opening surface of the young nozzle by the first signal S 41 is induced Helmholtz resonance oscillation H 1 ′ with a period T c, and thereafter does not significantly attenuate during application of the second signal S 42. continue.
- the third signal S 43 is the time when the Helmholtz resonance vibration of the period Tc superimposed on the meniscus is directed from the nozzle opening 6 to the pressure generating chamber 2, that is, the second signal S from the time when the first signal S 41 is applied.
- the time until the application of 42 is completed is selected and applied at a time when the period of Helmholtz resonance vibration is equal to 1/2 of the period Tc of the vibration, the vibration energy induced by the first signal S41 can be used. Therefore, the third signal S43 can draw the meniscus largely into the nozzle opening 6 even if the voltage difference is set relatively small.
- the fifth signal S45 is applied when the Helmholtz resonance vibration of the period Tc generated in the meniscus by the first signal S41 and the third signal S43 goes to the outlet of the nozzle opening 6. I do.
- the fifth signal S45 acts in the same direction as the first signal S41 to push the meniscus out of the nozzle opening 6.
- the duration T45 of the fifth signal S45 is desirably equal to or longer than the period Tc of the Helmholtz resonance oscillation so as not to unnecessarily amplify the Helmholtz resonance oscillation of the period Tc induced on the meniscus. Is set to substantially the same value as T c.
- FIG. 18 (a) shows the displacement of the meniscus when the first signal S41 was applied or left as it was, and the time from the point of application of the first signal S41 was taken with the periodic c as the time reference.
- the meniscus performs Helmholtz co-rotational vibration with a period Tc at the position N1 where the neutral line of the vibration is pushed further outward than the surface of the nozzle opening 6.
- the displacement speed (gradient ⁇ ) is small, ink droplets cannot be separated from the meniscus.
- FIG. 18 (b) shows the meniscus displacement when the third signal S43 is applied after the application of the first signal S41, and the pressure is generated by the application of the third signal S43. As the chamber 2 expands, the neutral line of the vibration moves from the position N1 to the position N2 on the pressure generating chamber side.
- FIG. 18 (c) shows the displacement of the meniscus when the fifth signal S45 is applied after applying the first signal S41 to the fourth signal, and the vibration is caused by the fifth signal S45.
- the neutral line is pushed up from position N2 to a position that almost matches the nozzle opening surface (horizontal axis in the figure).
- the peak P31 of the Helmholtz resonance vibration of the period Tc induced in the meniscus by the third signal S43 rises outward from the nozzle opening surface. Since the Helmholtz resonance vibration having the period Tc is superimposed on the meniscus pushed up by the third signal S43, the displacement speed (gradient 0) is sufficiently large. Therefore, the peak P 31 of the meniscus vibration separates from the meniscus and becomes a small ink droplet D and flies.
- the meniscus After ejecting the ink droplet, the meniscus is reversed and moves from the nozzle opening surface to the pressure generating chamber 2.
- the meniscus drawn from the nozzle opening surface moves the neutral line to the position N 3 and vibrates, but the meniscus returns to the vicinity of the nozzle opening surface after a sufficient time has elapsed due to its own surface tension.
- FIG. 18 (d) shows the case where the first signal S41 and the second signal S42 are eliminated and the potential difference between the third signal S43 and the fifth signal S45 is set to the same value, that is, It shows the vibration of the meniscus when the same signal (Fig. 19) as the conventional driving method is applied, and the neutral line of the vibration moves to the position N4 at the back of the pressure generating chamber by the signal S1 .
- the piezoelectric vibrator is extended by applying the third signal S3 after maintaining the charging voltage by the first signal for a predetermined time, the neutral line of the vibration returns to the nozzle opening surface, and the meniscus vibration rising from the nozzle opening surface Peak ⁇ 3 ⁇ flies as ink drop D '.
- the neutral line N is drawn by the third signal S43.
- the amount L 1 of pulling in from the nozzle opening surface is smaller than the amount L 2 of drawing in from the nozzle opening surface in the conventional driving method, and the amount of pushing up the meniscus for ejecting ink droplets for printing can be small.
- the amount of ink for printing can be reduced, and the amplitude of the residual vibration of the meniscus after the ejection of ink droplets can be reduced to prevent the occurrence of satellites and equalize the residual vibration. Time can be reduced.
- the meniscus is vibrated by the first signal S41, and the third signal S43 is applied when the meniscus vibrates toward the inside of the nozzle opening 6, so that the first signal S41
- the vibration energy can be used effectively, and ink droplets can be ejected with the voltage of the third signal reduced so that the ink It is possible to reduce the screw width of the meniscus residual vibration after drop ejection, and to improve the printing speed while preventing the generation of satellite.
- the meniscus in a stationary state is pushed by the first signal S41 to such a degree that ink droplets are not ejected outside the nozzle opening surface, and is oscillated and displaced.
- the potential difference of the fifth signal S25 which pushes the neutral line N of the meniscus to the tip of the nozzle opening 6 in order to eject ink droplets suitable for printing, can be made smaller than the third signal S43, and the satellite The printing speed can be improved while preventing the occurrence.
- representative data of the drive signal for realizing the drive method of the fourth embodiment is as follows.
- the first signal S41 has a voltage difference within a range in which ink droplets are not ejected, and is effectively meniscus. Is within the range in which the third signal S43 for ejecting ink droplets can be excited, for example, 0.2 to 0.5 times. If the potential difference of the first signal S41 is smaller than 0.2 times the driving voltage of the third signal S43, Helmholtz resonance oscillation of the periodic c cannot be induced in the meniscus, and the fifth signal S4 Pushing up the neutral line of the vibration for ejecting ink droplets by 5 becomes meaningless.
- the succession time T 41 of the first signal S 41 is shorter than the period T c of the Helmholtz resonance vibration, and in particular, due to the balance with the second signal S 42, is smaller than 1/2 of the period T c of the Helmholtz resonance vibration. It is desirable to set it short.
- the duration T 42 of the second signal S 42 is the time (T 41 + T 42) from the time when the first signal S 41 is applied to the time when the application of the second signal S 42 is completed. It is set to be an odd multiple of 1/2 of the period of movement Tc (1T2Tc, 3T2Tc, 5 / 2Tc, •), especially 1 / 2Tc. .
- the three signals S 43 are shorter than the period T c of the Helmholtz resonance vibration, and more specifically, the duration T 43 of the signal S 43 is shorter than the Helmholtz resonance vibration because the meniscus draws the Helmholtz resonance vibration into the nozzle opening 6 while largely oscillating. It is desirable to set Tc to be equal to or less than 1 Z2 and further to be equal to or less than the natural oscillation period of the piezoelectric vibrator 11.
- the duration T44 of the fourth signal S44 is set to be less than or equal to 12 of Tc so that the fifth signal S45 can be applied so as to push the meniscus.
- the fifth signal S 45 can set the neutral line N of the vibration of the meniscus to the nozzle opening surface without unnecessary oscillation of the Helmholtz resonance vibration preferably superimposed on the meniscus.
- the period is set to be equal to or longer than the period Tc of the Helmholtz resonance oscillation, and desirably the same value as the period Tc.
- the first signal S41 is 0% to 50% of the period Tc
- the second signal S42 is 0% to 50% of the period C of Helmholtz resonance oscillation, specifically 1 ⁇ S to 2 / S
- the third signal S 43 is shorter than the period T c, preferably 2 of the c
- the fourth signal S 44 is 0% to 50% of the period T c
- the fifth signal S 4 5 is longer than the period Tc, and is preferably set substantially equal to Tc.
- the fifth signal S45 is substantially the same as the period Tc, meniscus does not oscillate and satellites can be reliably prevented.
- the above-described example is a representative example in which an experiment was performed using an inkjet recording head having a period Tc of 6 IX S and a diameter of the nozzle opening 6 of ⁇ 26 ⁇ to explain the embodiment of the present invention.
- the period T c is 4 S to 20 ⁇ S
- the diameter of the nozzle opening 6 is ⁇ 20 n ⁇ !
- An experiment was also performed with an ink jet recording head of ⁇ 40 ⁇ m, and similar results were obtained.
- the longitudinal vibration mode piezoelectric vibrator is used.
- the capacitance is small, so it is about 2 ⁇ S.
- the pressure generating chamber can be expanded to generate Helmholtz resonance vibration necessary for discharging the ink droplets.
- the driving voltage applied to the piezoelectric vibrator can be set low, so that the period of Helmholtz resonance vibration of the meniscus TC oscillation is minimized to a minimum, and the period of Helmholtz resonance vibration of the meniscus Tc
- the driving voltage applied to the piezoelectric vibrator can be set low, so that the period of Helmholtz resonance vibration of the meniscus TC oscillation is minimized to a minimum, and the period of Helmholtz resonance vibration of the meniscus Tc
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/981,148 US6161912A (en) | 1996-04-10 | 1997-04-10 | Method of maintaining and controlling the helmholtz resonant frequency in an ink jet print head |
DE69724378T DE69724378T2 (de) | 1996-04-10 | 1997-04-10 | Verfahren zum betreiben eines tintenstrahlaufzeichnungskopfes |
EP97915701A EP0841164B1 (en) | 1996-04-10 | 1997-04-10 | Method of driving ink jet type recording head |
JP53606997A JP3569289B2 (ja) | 1996-04-10 | 1997-04-10 | インクジェット式記録ヘッドの駆動方法 |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8/88468 | 1996-04-10 | ||
JP8/88464 | 1996-04-10 | ||
JP8846496 | 1996-04-10 | ||
JP8846896 | 1996-04-10 | ||
JP8/272742 | 1996-10-15 | ||
JP27274296 | 1996-10-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997037852A1 true WO1997037852A1 (fr) | 1997-10-16 |
Family
ID=27305820
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/001238 WO1997037852A1 (fr) | 1996-04-10 | 1997-04-10 | Procede d'entrainement pour tete d'ecriture a jet d'encre |
Country Status (5)
Country | Link |
---|---|
US (1) | US6161912A (ja) |
EP (3) | EP0841164B1 (ja) |
JP (1) | JP3569289B2 (ja) |
DE (3) | DE69735214T2 (ja) |
WO (1) | WO1997037852A1 (ja) |
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EP0947325A1 (en) * | 1998-04-03 | 1999-10-06 | Seiko Epson Corporation | Method of driving an ink jet printhead |
US6364444B1 (en) | 1999-05-06 | 2002-04-02 | Nec Corporation | Apparatus for and method of driving ink-jet recording head for controlling amount of discharged ink drop |
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US6984010B2 (en) | 2000-09-01 | 2006-01-10 | Seiko Epson Corporation | Ink jet recording head, method of manufacturing the same method of driving the same, and ink jet recording apparatus incorporating the same |
US7073878B2 (en) | 2002-09-30 | 2006-07-11 | Seiko Epson Corporation | Liquid ejecting apparatus and controlling unit of liquid ejecting apparatus |
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US8263414B2 (en) | 2005-05-23 | 2012-09-11 | Siemens Healthcare Diagnostics Inc. | Dispensing of a diagnostic liquid onto a diagnostic reagent |
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- 1997-04-10 DE DE69735214T patent/DE69735214T2/de not_active Expired - Lifetime
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0947325A1 (en) * | 1998-04-03 | 1999-10-06 | Seiko Epson Corporation | Method of driving an ink jet printhead |
US6431675B1 (en) | 1998-04-03 | 2002-08-13 | Seiko Epson Corporation | Method of driving an ink jet printhead |
US6364444B1 (en) | 1999-05-06 | 2002-04-02 | Nec Corporation | Apparatus for and method of driving ink-jet recording head for controlling amount of discharged ink drop |
US6984010B2 (en) | 2000-09-01 | 2006-01-10 | Seiko Epson Corporation | Ink jet recording head, method of manufacturing the same method of driving the same, and ink jet recording apparatus incorporating the same |
WO2003026897A1 (en) * | 2001-09-20 | 2003-04-03 | Ricoh Company, Ltd. | Image recording apparatus and head driving control apparatus |
US7249816B2 (en) | 2001-09-20 | 2007-07-31 | Ricoh Company, Ltd. | Image recording apparatus and head driving control apparatus |
US7073878B2 (en) | 2002-09-30 | 2006-07-11 | Seiko Epson Corporation | Liquid ejecting apparatus and controlling unit of liquid ejecting apparatus |
JP2007069374A (ja) * | 2005-09-05 | 2007-03-22 | Fuji Xerox Co Ltd | 液滴吐出ヘッドの駆動方法、液滴吐出ヘッドおよび液滴吐出装置 |
JP2009073076A (ja) * | 2007-09-21 | 2009-04-09 | Seiko Epson Corp | 流体噴射装置のフラッシング方法 |
JP2009073074A (ja) * | 2007-09-21 | 2009-04-09 | Seiko Epson Corp | 流体噴射装置 |
JP2020108949A (ja) * | 2018-12-28 | 2020-07-16 | キヤノン株式会社 | 送液装置の駆動方法 |
Also Published As
Publication number | Publication date |
---|---|
EP0841164A4 (en) | 1999-11-10 |
DE69735214D1 (de) | 2006-04-20 |
DE69735214T2 (de) | 2006-10-19 |
EP0841164A1 (en) | 1998-05-13 |
EP1285759A2 (en) | 2003-02-26 |
JP3569289B2 (ja) | 2004-09-22 |
EP1285760B1 (en) | 2006-02-08 |
EP1285759A3 (en) | 2003-07-30 |
EP1285759B1 (en) | 2006-03-22 |
DE69735509T2 (de) | 2006-08-31 |
US6161912A (en) | 2000-12-19 |
EP0841164B1 (en) | 2003-08-27 |
DE69724378D1 (de) | 2003-10-02 |
EP1285760A3 (en) | 2003-07-30 |
EP1285760A2 (en) | 2003-02-26 |
DE69724378T2 (de) | 2004-06-09 |
DE69735509D1 (de) | 2006-05-11 |
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