WO2005014291A1 - 静電吸引型流体吐出装置 - Google Patents
静電吸引型流体吐出装置 Download PDFInfo
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- WO2005014291A1 WO2005014291A1 PCT/JP2004/011168 JP2004011168W WO2005014291A1 WO 2005014291 A1 WO2005014291 A1 WO 2005014291A1 JP 2004011168 W JP2004011168 W JP 2004011168W WO 2005014291 A1 WO2005014291 A1 WO 2005014291A1
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- nozzle
- fluid
- discharge
- suction type
- electrode
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Classifications
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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
- B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
Definitions
- the present invention relates to an electrostatic suction type fluid discharge device that discharges a fluid onto a target object by charging and electrically suctioning a conductive fluid such as ink.
- a fluid jet method for discharging a fluid such as ink onto an object (recording medium) includes a method such as a piezo-type thermal ink jet printer which is practically used as an ink jet printer.
- a method there is an electrostatic suction method in which a fluid to be discharged is a conductive fluid, and an electric field is applied to the conductive fluid to discharge from a nozzle.
- electrostatic suction type fluid discharge device Such an electrostatic suction type fluid discharge device (hereinafter referred to as an electrostatic suction type fluid discharge device) is described in, for example, Japanese Patent Publication No. 36-13768 (Japanese Patent Publication No. 196). August 18, 2001) and Japanese Patent Application Laid-Open No. 2001-88306 (publication date: April 3, 2001).
- Japanese Patent Laid-Open Publication No. 2000-127410 (published on May 9, 2000), which is a Japanese Patent Laid-Open Publication No. 2000-127410, uses a nozzle as a slit, a needle electrode protruding from the nozzle, and ink containing fine particles.
- an ink jet device for discharging ink For example, Japanese Patent Laid-Open Publication No. 8-238774 (publication date: September 17, 1996), which is a Japanese published patent publication, discloses an ink jet apparatus in which an electrode for voltage application is provided inside a nozzle! You.
- the design factors of the electrostatic suction type fluid ejection device are the conductivity of the ink liquid (eg, specific resistance 10 6 — loU Q cm) and the surface tension (eg, 0.020-0. 040NZm), viscosity (for example, 0.011-0. 015Pa-s), and applied voltage (electric field).
- the applied voltage the voltage applied to the nozzle and the distance between the nozzle and the counter electrode have been particularly important.
- the electrostatic suction type fluid ejection device utilizes instability of electro-fluid, and this is shown in FIG.
- a conductive fluid is allowed to stand in a uniform electric field
- the electrostatic force acting on the surface destabilizes the surface and promotes the growth of the string (electrostatic string phenomenon).
- the electric field at this time is an electric field E generated when a voltage V is applied between the nozzle and a counter electrode facing the nozzle at a distance of h.
- the growth wavelength at this time is physically derived.
- ⁇ is the electric field strength (VZm) assuming a parallel plate, and is between the nozzle and the opposing electrode.
- the kinetic energy imparted to the droplet discharged from the nozzle is proportional to the cube of the droplet radius. For this reason, fine droplets ejected when the nozzle is miniaturized cannot secure sufficient kinetic energy to withstand the air resistance at the time of ejection, are disturbed by air stagnation, etc., and accurate landing cannot be expected . Furthermore, as the droplet becomes finer, the effect of surface tension increases, so that the vapor pressure of the droplet increases and the amount of evaporation increases, so that the fine droplet significantly loses its mass during flight, There was a problem that it was difficult to maintain the form of the droplet even when it landed.
- the driving voltage of the conventional electrostatic suction type fluid discharge device is extremely high at 1000V or more, it is difficult to reduce the size and increase the density in consideration of leakage and interference between nozzles. If the nozzle diameter is further reduced, the above problem becomes more serious.
- power semiconductors with a high voltage exceeding 1000 V are generally expensive and have low frequency response.
- the nozzle diameter disclosed in Japanese Patent Publication No. 36-13768 is 0.127 mm, and the range of the nozzle diameter disclosed in Japanese Patent Publication No. 2001-88306 is 50-2000 ⁇ m. It was preferably in the range of 100-1000 m.
- the nozzle diameter is calculated by applying typical operating conditions in the conventional electrostatic suction type fluid discharge. As a result, assuming a surface tension of 0.020 NZm and an electric field strength of 10 7 VZm, the above equation (1) is obtained. By substituting and calculating, the growth wavelength is about 140 m. That is, a value of 70 m is obtained as the limit nozzle diameter. In other words, under the above conditions, even if a strong electric field of 10 7 VZm is used, if the nozzle diameter is about 70 ⁇ m or less, unless the back pressure is applied and measures such as forced meniscus formation are taken, It was thought that no electrostatic growth occurred and no electrostatic suction type fluid discharge was established. In other words, the fine nozzle and lower drive voltage Was considered an incompatible task.
- miniaturization and high accuracy of the nozzle are contradictory subjects, and it has been difficult to realize both at the same time.
- miniaturization of the nozzle and lowering of the driving voltage were both considered to be problems, as they were not compatible.
- the present invention has been made to solve the above problems, and has as its object to reduce the size of nozzles, increase the precision of ejection and landing positions of microfluids, and further reduce the driving voltage.
- An object of the present invention is to provide an electrostatic suction type fluid discharge device which is realized in all aspects.
- an electrostatic suction type fluid ejection device uses a fluid ejection hole of a nozzle of a fluid ejection head to discharge an ejection fluid charged by voltage application.
- the fluid ejecting hole of the nozzle has a nozzle diameter of 0.01—
- the electrode portion for applying a drive voltage for applying a charge to the discharge fluid and charging the discharge fluid is formed by coating the outer wall portion of the nozzle with a conductive material.
- a local electric field is generated by setting the diameter of the fluid ejection hole (nozzle diameter) of the nozzle to a fine diameter of 0.01 to 25 m. It becomes possible.
- Such a reduction in the driving voltage is extremely advantageous in miniaturizing the device and increasing the density of the nozzles.
- lowering the driving voltage also enables the use of a low-voltage driving driver with high cost merit.
- the electric field intensity required for ejection depends on the locally concentrated electric field intensity, so that the presence of the counter electrode is not essential. That is, printing can be performed on an insulating substrate or the like without the need for a counter electrode, thereby increasing the degree of freedom of the device configuration. In addition, printing can be performed on a thick insulator.
- the electrode portion for applying a drive voltage for applying a charge to the discharge fluid and charging the discharge fluid has a nozzle outer wall portion coated with a conductive material. Therefore, it is easy to realize a head configuration in which the distance between the electrode portion and the nozzle hole is made as short as possible. In other words, by bringing the position of the electrode portion closer to the nozzle hole, the dischargeable driving frequency can be improved, and the range of selection of the dischargeable material can be broadened to the higher resistance side.
- the electrode portion forms at least a part of the inner wall of the nozzle.
- the electrode portion forms at least a part of the inner wall of the nozzle, even when the discharge is not being performed, the electrode portion is capable of discharging the fluid in the nozzle. Is in contact with. For this reason, when a drive voltage is applied to the electrode portion, charge is supplied to the discharge fluid quickly, and discharge response is improved.
- another electrostatic suction type fluid ejection device of the present invention is to discharge a discharge fluid charged by applying a voltage from a fluid ejection hole of a nozzle of a fluid ejection head.
- the fluid ejection hole of the nozzle has a nozzle diameter of 0.01 to 25. m, and the tip of the nozzle is formed of a conductive material, and the tip of the nozzle formed of a conductive material also serves as an electrode for applying a drive voltage for applying a charge to the discharge fluid and charging it. It is characterized by
- the tip of the nozzle itself is formed of a conductive material, and the tip can be used as an electrode to supply electric charge to the discharge fluid in the nozzle.
- the electric charge can be simultaneously supplied to the discharged fluid inside the fluid flow path that is located at a position slightly away from the nozzle hole. For this reason, the ejection responsiveness is improved, and the charge following capability during continuous ejection, that is, the continuous ejection stability is improved.
- the above-mentioned electrostatic suction type fluid discharge device is characterized in that a pressure applying means for applying pressure inside the nozzle is provided.
- a configuration having a step can be adopted.
- the discharge fluid in the nozzle can be maintained in a state in which the discharge fluid in the nozzle is supplied with the derivation pressure by the pressure applying means and is drawn out of the nozzle hole force.
- the driving voltage is applied to the electrode portion, the supply of electric charge can be received from the electrode portion, and stable ejection can be realized.
- still another electrostatic suction type fluid ejection device of the present invention uses a fluid ejection hole force of a nozzle of a fluid ejection head to apply ejection fluid charged by voltage application.
- the fluid ejection hole of the nozzle has a nozzle diameter of 0. 01-25 m, and an electrode portion for applying a drive voltage for applying a charge to the discharge fluid and applying the electric charge to the discharge fluid.
- the electrode is disposed inside the nozzle, and the inner wall surface at the tip of the nozzle has a tapered portion. If the taper angle is ⁇ , the taper length is L, the nozzle diameter is d, and LZd> 5, the taper angle ⁇ is set to 21 ° or more! /
- the tapered portion is formed on the inner wall surface of the nozzle tip, and the taper angle is set to 21 ° or more.
- the electrical resistance between the nozzle hole and the nozzle hole can be greatly suppressed, and the discharge limit frequency can be improved, and the selectivity of the discharge material to the high resistance side can be improved.
- still another electrostatic suction type fluid ejection device of the present invention uses a fluid ejection hole force of a nozzle of a fluid ejection head to apply an ejection fluid charged by voltage application.
- the fluid ejection hole of the nozzle has a nozzle diameter of 0. 01-25 m, and an electrode portion for applying a drive voltage for applying a charge to the discharge fluid and applying the electric charge to the discharge fluid.
- the electrode is disposed inside the nozzle, and the inner wall surface at the tip of the nozzle has a tapered portion. If the taper angle is ⁇ , the taper length is L, the nozzle diameter is d, and L / d is 100, the taper angle ⁇
- the electrode portion is arranged inside the nozzle by forming the tapered portion on the inner wall surface of the nozzle tip and setting the taper angle to be 0> 58 X dZL.
- the electric resistance between the electrode portion and the nozzle hole can be largely suppressed, and the discharge limit frequency can be improved, and the selectivity of the discharge material to the high resistance side can be improved.
- the electrode section is a rod-shaped electrode inserted and arranged inside the nozzle, and the tip is inserted to a position where the tip comes into contact with the inner wall surface of the tapered section. It can be done.
- the electric resistance of the discharge fluid flow path between the electrode portion and the nozzle hole can be reduced by bringing the electrode portion as close to the nozzle hole as possible, and It is possible to improve the limit frequency and the selectivity of the discharged fluid to the high resistance side.
- FIG. 1 showing an embodiment of the present invention, is a cross-sectional view illustrating a nozzle configuration of a fluid ejection head of an electrostatic suction type fluid ejection device according to Embodiment 1.
- FIG. 2 is a view for explaining calculation of electric field strength of a nozzle based on a discharge model which is a basic of the present invention.
- FIG. 3 is a graph showing a model calculation result of nozzle diameter dependence of surface tension pressure and electrostatic pressure.
- FIG. 4 is a graph showing a model calculation result of nozzle diameter dependence of discharge pressure.
- FIG. 5 is a graph showing a model calculation result of a nozzle diameter dependence of a discharge limit voltage.
- FIG. 6 is a graph showing the results of experimentally determining the nozzle diameter dependence of the discharge start voltage.
- FIG. 7 is a graph showing the relationship between the distance between electrode nozzle holes and the conductivity of a material usable as a discharge fluid in an electrostatic suction type fluid discharge device.
- FIG. 8 is a cross-sectional view showing a modified example of the nozzle configuration in the fluid ejection head of the electrostatic suction type fluid ejection device according to Embodiment 1.
- FIG. 9 illustrates another embodiment of the present invention, and illustrates an electrostatic suction type flow according to Embodiment 2.
- FIG. 3 is a cross-sectional view illustrating a nozzle configuration of a fluid ejection head of the body ejection device.
- FIG. 10 showing another embodiment of the present invention, is a cross-sectional view illustrating a configuration of a fluid ejection head of an electrostatic suction type fluid ejection device according to Embodiment 3.
- FIG. 11 showing another embodiment of the present invention, is a cross-sectional view illustrating a nozzle configuration of a fluid ejection head of an electrostatic suction type fluid ejection device according to Embodiment 4.
- FIG. 12 is a graph showing a relationship between a taper angle and a resistivity in the electrostatic suction type fluid ejection device according to the fourth embodiment.
- FIG. 13 is a graph showing a relationship between a taper length nozzle diameter ratio LZd and a taper angle ⁇ ⁇ ⁇ ⁇ in the electrostatic suction type fluid discharge device according to the fourth embodiment.
- FIG. 14 shows another embodiment of the present invention, and is a cross-sectional view showing a nozzle configuration of a fluid ejection head of an electrostatic suction type fluid ejection device according to Embodiment 5.
- FIG. 15 is a view showing a growth principle of a discharged fluid due to an electrostatic string phenomenon in an electrostatic suction type fluid discharge device.
- the electrostatic suction type fluid ejection device has a nozzle diameter of 0.01 ⁇ m to 25 m, and is capable of controlling ejection of ejection fluid with a driving voltage of 1000 V or less. I have.
- a nozzle having a diameter d (in the following description, unless otherwise specified, refers to the inner diameter of the nozzle) Assume that the conductive fluid is injected and positioned perpendicular to the height of the infinite plate conductor force h. This l QS
- Figure 2 shows the situation. At this time, it is assumed that the electric charge Q induced at the nozzle tip concentrates on the hemisphere formed by the discharge fluid at the nozzle tip, and is approximately represented by the following equation.
- Nozzle diameter (m), V total voltage applied to the nozzle. Is the nozzle shape, etc.
- a mirror image charge Q ′ having a polarity opposite to that of the charge Q is induced at a symmetric position in the substrate facing the nozzle.
- the substrate is an insulator
- a video charge Q ′ having a polarity opposite to that of the charge Q is similarly induced at a symmetric position determined by the dielectric constant.
- k is a proportional constant that depends on the nozzle shape, etc., and is a force that takes a value of about 1.5-8.5. In many cases, it is considered to be about 5 (PJ Birdseye and DA Smith, Surface Science, 23 ( 1970), p.198-210).
- R dZ2 to simplify the fluid ejection model. This corresponds to a state in which the conductive ink is swelled in a hemispherical shape having the same radius of curvature as the nozzle diameter d due to surface tension at the nozzle tip.
- ⁇ surface tension. The condition under which the ejection occurs due to the electrostatic force is that the electrostatic force exceeds the surface tension.
- Figure 3 shows the relationship between the pressure due to surface tension and the electrostatic pressure when a nozzle with a certain diameter d is given.
- the electrostatic pressure exceeds the surface tension when the nozzle diameter d is 25 m. From this, V and d
- FIG. 4 shows the dependence of the ejection pressure ⁇ ⁇ when the ejection condition is satisfied by the local electric field strength for a nozzle having a certain diameter d, and the ejection critical voltage (ie, the minimum voltage at which ejection occurs) Vc
- Figure 5 shows the dependence of
- the upper limit of the nozzle diameter (assuming 2 mNZm) is 25 ⁇ m.
- the driving voltage required for ejection increases as the nozzle diameter becomes smaller.
- the electric field intensity required for ejection depends on the locally concentrated electric field intensity, so that the presence of the counter electrode is not essential.
- an electric field is applied between the nozzle and the substrate. Therefore, it is necessary to dispose a counter electrode on the side opposite to the nozzle or to make the substrate conductive for an insulating substrate. there were .
- the counter electrode is arranged, that is, when the substrate is an insulator, there is a limit to the thickness of the substrate that can be used.
- printing can be performed even on an insulating substrate or the like without the need for a counter electrode, thereby increasing the degree of freedom of the device configuration.
- printing can be performed even on a thick insulator.
- the local electric field strength Based on the newly proposed discharge model focusing on, it is possible to use a fine nozzle with a nozzle diameter of 0.1 Ol ⁇ m-25 m, and at a drive voltage of 1000 V or less, Discharge control can be performed.
- a driving voltage of 700 V or less was used for a nozzle with a diameter of 25 ⁇ m or less, and a driving voltage of 500 V or less for a nozzle with a diameter of 10 ⁇ m or less.
- ejection control can be performed with a driving voltage of 300 V or less.
- FIG. 6 shows the results of experimentally determining the nozzle diameter dependence of the discharge critical voltage Vc.
- the measurement was performed under the condition that the distance between the nozzle and the substrate was 100 m, using a silver nanopaste manufactured by Rima Kasei Co., Ltd. as the discharge fluid. From FIG. 6, it can be seen that as the nozzle becomes finer, the discharge critical voltage Vc decreases, and it becomes possible to discharge at a lower voltage than before.
- the discharge characteristics basically depend on the driving electrode force inside the fluid discharge head and the electric resistance value in the discharge fluid flow path to the tip of the nozzle.
- the discharge responsiveness improves as the electric resistance value decreases.
- the drive frequency can be improved by lowering the electric resistance value in the discharge fluid flow path, and furthermore, discharge of the discharge fluid material with higher resistance becomes possible, and the range of selection of the discharge fluid material is increased. Can be spread.
- the nozzle diameter is reduced. As the size becomes smaller, it is structurally difficult to bring the drive electrode inside the fluid flow path closer to the nozzle hole, specifically, to coat the electrode on the inner wall surface of the ink flow path or insert the electrode wire near the nozzle. It becomes.
- the outer wall portion of the nozzle is coated with a conductive material, and a driving voltage is applied at the tip of the nozzle, By applying a charge to the ejection fluid at the tip of the nozzle, the ejection characteristics of the fluid ejection head having fine nozzles are improved.
- a driving voltage is applied at the tip of the nozzle.
- FIG. 1 shows a nozzle configuration of a fluid ejection head in the electrostatic bow suction type I fluid ejection device according to the first embodiment.
- the nozzle of the fluid discharge head shown in FIG. 1 has a sharp nozzle section 10, an electrode section 20 installed on the outer wall thereof, a fluid flow path 30 provided in the nozzle section 10, and a fluid flow It is constituted by a nozzle hole 40 provided at the end of the passage 30, that is, at the tip of the nozzle. Further, a power supply 50 for applying a drive voltage is connected to the electrode section 20.
- the nozzle section 10 is preferably made of an insulating material, and is particularly preferably made of glass. Glass and the like are preferable. A nozzle having an inner diameter of about 1 ⁇ m can be easily formed by deforming the glass tube by applying heat and tensile force. It is possible to make holes.
- the electrode section 20 is preferably a conductive material, and is particularly preferably a low-resistance material having high adhesion to the nozzle section 10.
- the electrode section 20 can be easily manufactured by a general vacuum deposition method, sputtering, plating, or the like.
- the electrode portion 20 in FIG. 1 forms at least a part of the inner wall of the nozzle hole 40, and even if the discharge is not performed, the electrode portion 20 and the discharge fluid in the nozzle are in contact with each other. It comes into contact and becomes in a state.
- the nozzle hole 40 may be blocked by the material for forming the electrode portion 20, so that it is necessary to devise the installation direction of the nozzle when the electrode portion 20 is manufactured. It becomes. Further, under the condition that the nozzle hole 40 is inevitably closed, it is necessary to form the nozzle hole 40 in a punching force using a laser or the like after the formation of the electrode portion 20.
- Discharge from the time when the discharge fluid starts to be supplied with the electric charge from the electrode unit 20 until the discharge is started The response time greatly depends on the distance between the electrode portion 20 and the nozzle hole 40, and as shown in FIG. 1, in the case where the nozzle hole 40 and the electrode portion 20 match, the discharge response time is the earliest. Can be obtained.
- Table 1 below shows a comparison of the discharge limit frequency between the case where an electrode is actually inserted inside the fluid flow path 30 and the case where an electrode is formed on the outer wall by an electrode coat.
- the nozzle hole is as small as ⁇ .2 / zm, the difference between the diameter of the inserted electrode and the diameter of the nozzle hole is large even if an electrode is inserted inside, so the distance between the nozzle hole and the electrode is as large as 680 m.
- the electrode is formed by electrically coating the outer wall of the nozzle, the electrode portion can be brought close to the vicinity of the nozzle hole. For this reason, by forming an electrode on the outer wall of the nozzle, the discharge responsiveness is increased, and the discharge limit frequency can be 30 times higher than when the electrode is inserted internally.
- FIG. 7 shows the relationship between the distance between the electrode nozzle holes and the conductivity of a material that can be used as a discharge fluid. As described above, since the distance between the electrode nozzle holes and the conductivity of the discharge material are basically in a loose relationship, it is necessary to bring the electrode position closer to the nozzle holes in order to discharge the high-resistance material. Understand.
- the outer wall portion of the nozzle is coated with a conductive material to form the electrode portion 20, and thus the fluid flow path is formed.
- the electrode portion is formed inside, it is easier to realize a head configuration in which the distance between the electrode portion 20 and the nozzle hole 40 is made as short as possible.
- the position of the electrode portion 20 closer to the nozzle hole 40 it is possible to improve the dischargeable driving frequency and to widen the range of selection of the dischargeable material toward the high resistance side.
- the discharge fluid in the fluid flow path 30 is in contact with the electrode unit 20 even when the discharge is not performed, and by applying a desired drive voltage to the electrode unit 20 Discharge fluid Is supplied.
- the discharge fluid may be drawn into the fluid flow path 30 from the nozzle hole 40, and the discharge fluid may not be in contact with the electrode unit 20.
- the electrowetting effect is an effect that the wettability of the discharged fluid is improved by the action of an electric field on the discharged fluid. That is, when the wettability of the discharged fluid is improved by the electrowetting effect, the discharged fluid moves so as to increase the contact area with the wall surface without the nozzle portion 10, and the nozzle hole 40 shows an operation of seeping out.
- a configuration in which a nozzle hole is provided on a flat surface with respect to a force described in connection with a sharp nozzle shape may be used.
- the electrode portion 20 forms at least a part of the inner wall of the nozzle hole 40 at the tip of the nozzle of the fluid discharge head, and the discharge is performed. Even in this state, the electrode section 20 is in contact with the discharge fluid in the nozzle.
- the present invention is not limited to this, but may have a configuration in which the electrode portion 20 does not form the inner wall of the nozzle hole 40 as shown in FIG.
- the electrode section 20 does not contact the discharge fluid in the nozzle.
- the discharge fluid in the fluid flow path 30 exudes from the nozzle hole 40 to the outside due to the electrowetting effect and comes into contact with the electrode portion 20 (FIG. 8 shows this state).
- the nozzle hole 40 is not blocked by the material forming the electrode portion 20 when the electrode portion 20 is formed. In addition, there is an advantage that the formation of the electrode portion 20 is facilitated. However, in the configuration shown in FIG. 8, it is necessary that the tip of the nozzle has a pointed shape and the nozzle hole 40 and the electrode section 20 are sufficiently close to each other.
- FIG. 9 shows a nozzle configuration of a fluid ejection head in the electrostatic suction type fluid ejection device according to the second embodiment.
- the material forming the nozzle portion 10 is an insulating material.
- the nozzle portion is made of a conductive material.
- the nozzle portion 10 ′ also serves as an electrode portion, and the power source 50 is connected to the nozzle portion 10 ′.
- a conductive polymer material can be used in addition to a metal material such as aluminum, nickel, copper, and silicon.
- RIE Reactive Ion Etching
- laser force etching light-assisted electrolytic etching, or the like can be applied. .
- the entire tip of the nozzle is formed of a conductive material, so that the drive frequency is improved by improving the discharge response.
- FIG. 10 shows a schematic configuration of the electrostatic suction type fluid ejection device according to the third embodiment.
- description of the same parts as in the first and second embodiments will be omitted, and only different parts will be described.
- the fluid discharge head having the configuration according to the third embodiment includes a pressure control mechanism connected to the pressure control device 70 via the joint 60 on the upstream side in the discharge direction of the nozzle 10.
- Discharge in fluid flow path 30 An external pressure is applied to the discharged fluid by the pressure control device 70 even when the fluid is not discharged, and the discharged fluid is led out of the nozzle hole 40 by the external pressure.
- the derived pressure by the pressure controller 70 varies depending on the nozzle hole diameter ⁇ the viscosity of the discharge fluid, etc. For example, when the diameter of the nozzle hole 40 is ⁇ ⁇ ⁇ m, the discharge pressure is in the range of 0.3 to 0.6 MPa.
- the outflow fluid can be led out of the nozzle hole 40.
- the discharged fluid that has passed through the minute nozzle hole 40 comes into contact with the electrode portion 20, so that when the fluid is discharged, the voltage is applied to the electrode portion 20 at the same time as the voltage is applied.
- the electric charge can be supplied from the electrode section 20, and the discharge is performed by receiving the electric field force at the tip of the nozzle.
- the ejection fluid is applied to the nozzle hole by applying pressure to the ejection fluid from the upstream of the ejection unit. It can be kept in contact with the guide electrode portion, and stable discharge can be realized.
- Fig. 10 illustrates a combination of the pressure control device 70 with the nozzle configuration shown in Fig. 1.
- the force control device 70 may be combined with the nozzle configuration shown in Fig. 8.
- FIG. 11 shows a schematic configuration of a fluid projection head in the electrostatic suction type fluid ejection device according to the fourth embodiment.
- the fluid projection head of the electrostatic suction type fluid discharge device has a configuration in which the drive electrode portion 80 is provided inside the fluid flow path 30, and the distal end portion of the nozzle portion 10
- the discharge limit frequency is improved, and the selectivity of the discharge material to the high resistance side is improved.
- the discharge characteristics depend on the electric resistance of the discharge fluid present in the flow path 30 between the drive electrode 20 and the nozzle hole 40.
- the parameters that determine the electric resistance inside the fluid flow path 30 include the flow path length and the cross-sectional area of the fluid flow path 30 and the conductivity of the discharged fluid. Is considered as one parameter of the taper angle ⁇ , the relationship between the taper angle ⁇ and the electric resistance (resistance ratio) inside the fluid flow path 30 is as shown in FIG.
- the resistance ratio in FIG. 12 is the ratio to the electric resistance value inside the fluid flow path 30 at the tapered portion when the taper angle ⁇ is 0 °. Shows the rate.
- the taper length L indicates the length of the tapered portion of the nozzle portion 10 along the fluid discharge direction.
- the relationship of LZd is usually 5 or more and 100 or less.
- the taper length L is not limited by the size of the nozzle diameter d, and the design range is determined to some extent.Therefore, the value of LZd increases as the nozzle diameter decreases and decreases as the nozzle diameter increases. Tend.
- FIG. 12 shows that, regardless of the value of L / d, the resistance ratio force S decreases as the taper angle ⁇ ⁇ ⁇ increases.
- the resistance ratio can be reduced to 20% or less when the LZd force or more.
- the inner wall taper angle ⁇ of the nozzle portion 10 is set to 21 ° or more, so that the electrode portion 80 and the nozzle hole are formed.
- the electric resistance between 40 and 40 can be greatly suppressed, and the discharge limit frequency can be improved, and the selectivity of the discharge material to the high resistance side can be improved.
- FIG. 13 shows the relationship between the taper length nozzle diameter ratio LZd and the taper angle ⁇ when the resistance ratio is 30%. From Fig. 13, under the condition that the resistance ratio is 30%,
- FIG. 14 shows a schematic configuration of the fluid projection head in the electrostatic suction type fluid ejection device according to the fifth embodiment.
- the description of the same parts as in the first to fourth embodiments will be omitted, and only different parts will be described.
- the fluid flow path 3 An electrode portion 90, which is a rod-shaped electrode, is inserted into 0, and the electrode portion 90 is arranged so as to be in contact with three or more points on the tapered inner wall surface.
- the electric resistance of the discharge fluid flow path between the electrode part 90 and the nozzle hole 40 can be reduced by bringing the electrode part 90 as close to the nozzle hole 40 as possible, and the discharge limit can be reduced.
- the frequency can be improved and the selectivity of the discharged fluid to the high resistance side can be improved.
- the present invention can be applied to an ink jet printer or the like.
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- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Electrostatic Spraying Apparatus (AREA)
- Coating Apparatus (AREA)
Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/567,874 US7604326B2 (en) | 2003-08-08 | 2004-08-04 | Electrostatic suction type fluid discharge device |
CN2004800224952A CN1832858B (zh) | 2003-08-08 | 2004-08-04 | 静电吸引型流体排出装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-206961 | 2003-08-08 | ||
JP2003206961A JP2005059215A (ja) | 2003-08-08 | 2003-08-08 | 静電吸引型流体吐出装置 |
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WO2005014291A1 true WO2005014291A1 (ja) | 2005-02-17 |
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US (1) | US7604326B2 (ja) |
JP (1) | JP2005059215A (ja) |
CN (1) | CN1832858B (ja) |
TW (1) | TWI253987B (ja) |
WO (1) | WO2005014291A1 (ja) |
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EP1738911B1 (en) | 2005-06-30 | 2010-02-24 | Brother Kogyo Kabushiki Kaisha | Liquid discharging apparatus |
DE502006005293D1 (de) * | 2006-08-25 | 2009-12-17 | Homag Holzbearbeitungssysteme | Vorrichtung zum Bemustern von Werkstücken |
ES2402367T3 (es) * | 2006-12-20 | 2013-05-03 | Homag Holzbearbeitungssysteme Ag | Dispositivo y procedimiento para recubrir piezas |
DE502007002035D1 (de) | 2007-03-27 | 2009-12-31 | Homag Holzbearbeitungssysteme | Verfahren zum Bedrucken eines dreidimensionalen Behälters |
PL1990204T3 (pl) * | 2007-05-10 | 2016-04-29 | Homag Holzbearbeitungssysteme Ag | Sposób i urządzenie do powlekania powierzchni |
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- 2003-08-08 JP JP2003206961A patent/JP2005059215A/ja active Pending
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- 2004-08-04 WO PCT/JP2004/011168 patent/WO2005014291A1/ja active Application Filing
- 2004-08-04 CN CN2004800224952A patent/CN1832858B/zh not_active Expired - Fee Related
- 2004-08-04 US US10/567,874 patent/US7604326B2/en not_active Expired - Fee Related
- 2004-08-06 TW TW093123748A patent/TWI253987B/zh not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
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US20080151006A1 (en) | 2008-06-26 |
CN1832858A (zh) | 2006-09-13 |
JP2005059215A (ja) | 2005-03-10 |
TW200524742A (en) | 2005-08-01 |
TWI253987B (en) | 2006-05-01 |
US7604326B2 (en) | 2009-10-20 |
CN1832858B (zh) | 2010-04-14 |
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