LIQUID DISCHARGE DEVICE AND LIQUID DISCHARGE CONTROL METHOD

Abstract

A liquid ejection device and a liquid ejection control method capable of opening and closing a nozzle at high speed using a piezoelectric element with low generating force and low capacitance. [Solution] The block rod 40 has a first block face 41 that receives the force generated by the piezoelectric element 11, a second block face 42 that is parallel to the second displacement direction Y and faces the first block face 41, and a third block face 43 that is not parallel to the second displacement direction Y and faces the first block face 41. A plurality of cylindrical rollers 51 are arranged on the first block face 41, a plurality of first vibration plates 53 are arranged between the second block face 42 and the housing 12, and a plurality of second vibration plates 54 are arranged between the third block face 43 and the housing 12. The block rod 40 moves in the second displacement direction Y by the cylindrical rollers 51, and moves in the first displacement direction X and the second displacement direction Y by the first vibration plate 53 and the second vibration plate 54.

Description

[Technical field]

[0001] The present invention relates to a liquid agent discharging device and a liquid agent discharging method that can continuously discharge a liquid agent in droplet form at high speed and apply the liquid agent to a workpiece even from a distant position. [Background technology]

[0002] Patent Documents 1 and 2 disclose droplet applicators that use a piezoelectric element and a displacement magnifying mechanism to apply a predetermined amount of liquid such as resin or adhesive to a substrate or other object to be coated. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2018-524151 [Patent Document 2] Patent No. 6813898 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 describes a method of driving the actuator using a displacement magnifying mechanism made up of a piezoelectric element and an elastic hinge, but elastic hinges vibrate significantly at high frequencies and are therefore unsuitable for high-speed driving. In addition, a piezoelectric element with a large electrostatic capacity that generates a large force is required, and a large instantaneous current flows for high-speed driving, which places a large load on the piezoelectric element and controller and makes the actuator unsuitable for high-speed driving. In contrast, Patent Document 2 uses a displacement magnification mechanism that uses an arm and two piezoelectric elements to input voltage signals to each piezoelectric element in sequence to move the plunger up and down, which takes longer than driving with a single piezoelectric element and is not suitable for high-speed driving.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a liquid ejection device and a liquid ejection control method that are capable of opening and closing a nozzle at high speed using a piezoelectric element that generates a low force and has a low capacitance. [Means for solving the problem]

[0006] The liquid agent discharge device of the present invention described in claim 1 includes a nozzle 21 for discharging a liquid agent, a liquid agent supply path 23 for supplying the liquid agent to the nozzle 21, a piston rod 24 for opening and closing the nozzle 21, a rod biasing means 16 for biasing the piston rod 24 in a direction Y to open the nozzle 21, a block rod 40 for biasing the piston rod 24 in a direction Y to close the nozzle 21, and a drive source 11 for operating the block rod 40, wherein a piezoelectric element is used as the drive source 11, and a voltage Va is applied to the piezoelectric element 11 to bring the piezoelectric element 11 into an extended state, and when the piezoelectric element 11 is in the extended state, a first displacement amount is imparted to the block rod 40 from a first displacement direction X, and when the first displacement amount is imparted to the block rod 40, the block rod 40 moves in a second displacement direction Y different from the first displacement direction X by a second displacement amount larger than the first displacement amount, and the block rod 40 moves in the second displacement direction Y. a housing 12 accommodating the block rod 40, the block rod 40 having a first block face 41 receiving a force generated by the piezoelectric element 11, a second block face 42 parallel to the second displacement direction Y and facing the first block face 41, and a third block face 43 not parallel to the second displacement direction Y and facing the first block face 41, a plurality of cylindrical rollers 51 are arranged on the first block face 41, a plurality of first vibration plates 53 are arranged between the second block face 42 and the housing 12, and a plurality of second vibration plates 54 are arranged between the third block face 43 and the housing 12, the block rod 40 is moved in the second displacement direction Y by the cylindrical rollers 51, and moved in the first displacement direction X and the second displacement direction Y by the first vibration plate 53 and the second vibration plate 54. The present invention described in claim 2 is characterized in that, in the liquid agent ejection device described in claim 1, the amount of movement of the block rod 40 caused by the first vibration plate 53 and the second vibration plate 54 is greater in the second displacement direction Y than in the first displacement direction X. The present invention described in claim 3 is characterized in that, in the liquid agent ejection device described in claim 1, slits 55 are formed in the second block face 42, the third block face 43, and the housing 12, and the first vibration plate 53 and the second vibration plate 54 are fixed by the slits 55. The present invention according to claim 4 provides the liquid agent ejection device according to claim 1, The first diaphragm 53 and the second diaphragm 54 is characterized in that it is made of stainless steel or titanium alloy. The present invention as set forth in claim 5 is characterized in that in the liquid agent ejection device as set forth in claim 1, the block rod 40 is made of a cemented carbide alloy. The present invention according to claim 6 is characterized in that in the liquid agent ejection device according to claim 1, a weight material can be added to the block rod 40. A seventh aspect of the present invention is characterized in that, in the liquid agent ejection device according to the first aspect, the block rod 40 is made of silicon nitride or alumina. The present invention as set forth in claim 8 is characterized in that in the liquid agent ejection device as set forth in claim 1, a cavity 45 is formed in the block rod 40. The present invention described in claim 9 is characterized in that, in the liquid agent ejection device described in claim 1, the periphery of the piezoelectric element 11 is covered with a heat dissipating elastic resin 13, the outer peripheral surface of the heat dissipating elastic resin 13 is covered with a stainless steel cylindrical casing 14, and a heat sink 15 is brought into contact with the stainless steel cylindrical casing 14. The present invention described in claim 10 is characterized in that, in the liquid agent ejection device described in claim 1, it comprises a liquid agent supply housing 20 which forms the nozzle 21 and the liquid agent supply path 23, and a frame housing 10 which accommodates the block rod 40, the driving source 11, and the housing 12, and the liquid agent supply housing 20 is detachable from the frame housing 10. The liquid agent ejection control method of the present invention described in claim 11 is a liquid agent ejection control method using the liquid agent ejection device described in any one of claims 1 to 10, characterized in that a first voltage V1 is applied to the piezoelectric element 11 to bring it into the extended state, a second voltage V2 is applied to the piezoelectric element 11 to bring it into the contracted state, the first voltage V1 is changed to set a position where the nozzle 21 is closed, the second voltage V2 is changed to set a position where the nozzle 21 is open, the pressing force of the piston rod 24 against the nozzle 21 is adjusted by changing the first voltage V1, and the application diameter of droplets of the liquid agent is adjusted by changing the second voltage V2. Effect of the Invention

[0007] According to the liquid agent ejection device of the present invention, the displacement from the piezoelectric element can be efficiently transmitted to the piston rod via the block rod connected by the first vibration plate and the second vibration plate, and the nozzle can be opened and closed at high speed using a piezoelectric element with low generation force and low capacitance. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic configuration diagram showing a liquid agent ejection device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a perspective view of the main part of the device showing the block rod. [Diagram 3] FIG. 1 is a perspective view of a block rod that can be used in the device. [Figure 4] FIG. 2 is an explanatory diagram showing the relationship between a first displacement amount and a second displacement amount in the device. [Diagram 5] A diagram showing the installation of a liquid supply housing that constitutes the device. [Figure 6] FIG. 13 is a perspective view of a main part showing a method of attaching the liquid supply housing to the frame housing; [Figure 7] An explanatory diagram of a liquid ejection control method using the device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A liquid agent ejection device according to a first embodiment of the present invention has a housing that accommodates a block rod, the block rod having a first block surface that receives a force generated by a piezoelectric element, a second block surface that is parallel to a second displacement direction and faces the first block surface, and a third block surface that is not parallel to the second displacement direction and faces the first block surface, a plurality of cylindrical rollers are arranged on the first block surface, a plurality of first vibration plates are arranged between the second block surface and the housing, and a plurality of second vibration plates are arranged between the third block surface and the housing, and the block rod is moved in the second displacement direction by the cylindrical rollers and in the first and second displacement directions by the first and second vibration plates. According to this embodiment, the displacement from the piezoelectric element can be efficiently transmitted to the piston rod via the block rod connected by the first vibration plate and the second vibration plate, and the nozzle can be opened and closed at high speed using a piezoelectric element with low generation force and low capacitance.

[0010] A second embodiment of the present invention is the liquid agent ejection device according to the first embodiment, wherein the amount of movement of the block rod caused by the first and second vibration plates is greater in the second displacement direction than in the first displacement direction. According to this embodiment, the second displacement amount can be set to be larger than the first displacement amount.

[0011] A third embodiment of the present invention is a liquid agent ejection device according to the first embodiment, wherein slits are formed in the second block face, the third block face and the housing, and the first vibration plate and the second vibration plate are fixed by the slits. According to this embodiment, excessive movement of the block rod during displacement can be further suppressed.

[0012] A fourth embodiment of the present invention relates to a liquid agent ejection device according to the first embodiment, First diaphragm and second diaphragm The bearing is made of stainless steel or titanium alloy. According to this embodiment, the rigidity and spring characteristics of the material enable the nozzle to be opened and closed without wear and with a long life.

[0013] A fifth embodiment of the present invention is such that in the liquid agent discharge device according to the first embodiment, the block rod is made of a cemented carbide alloy. According to this embodiment, since it is possible to make the nozzle heavy and highly rigid, it becomes easier to close the nozzle, and it is possible to eject a liquid agent at a low voltage, and even a liquid agent with a high viscosity can be ejected.

[0014] A sixth embodiment of the present invention is a liquid agent discharge device according to the first embodiment, in which a weight material can be added to the block rod. According to this embodiment, the weight can be adjusted to be heavier, and ejection can be performed at a lower voltage, making it easier to eject high-viscosity liquid agents.

[0015] A seventh embodiment of the present invention is such that in the liquid agent discharge device according to the first embodiment, the block rod is made of silicon nitride or alumina. According to this embodiment, the nozzle is lighter and easier to open, and can be driven at a higher frequency than with carbide or stainless steel.

[0016] In an eighth embodiment of the present invention, in the liquid agent discharge device according to the first embodiment, a cavity is formed in the block rod. According to this embodiment, the nozzle is lighter and easier to open, and can be driven at a higher frequency than with carbide or stainless steel.

[0017] A ninth embodiment of the present invention is a liquid agent ejection device according to the first embodiment, further comprising: covering a periphery of the piezoelectric element with a heat dissipating elastic resin; and covering an outer peripheral surface of the heat dissipating elastic resin with a stainless steel cylindrical housing; A heat sink is attached to a stainless steel cylindrical housing. According to this embodiment, heat generated by the piezoelectric element can be efficiently dissipated, so that the piezoelectric element can be driven for a longer period of time at a high driving frequency.

[0018] A tenth embodiment of the present invention is a liquid agent ejection device according to the first embodiment, which is provided with a liquid agent supply housing that forms a nozzle and a liquid agent supply path, and a frame housing that accommodates a block rod, a drive source, and a housing, and the liquid agent supply housing is detachable from the frame housing. According to this embodiment, the liquid agent and the nozzle diameter can be easily changed.

[0019] A liquid agent ejection control method according to an eleventh embodiment of the present invention is a liquid agent ejection control method using a liquid agent ejection device in any of the first to tenth embodiments, in which a first voltage is applied to a piezoelectric element to bring it into an extended state, a second voltage is applied to the piezoelectric element to bring it into a contracted state, the first voltage is changed to set a position where the nozzle is closed, the second voltage is changed to set a position where the nozzle is open, the first voltage is changed to adjust the pressing force of the piston rod against the nozzle, and the second voltage is changed to adjust the application diameter of droplets of the liquid agent. According to this embodiment, the pressing force of the piston rod against the nozzle can be adjusted by adjusting the first and second voltages applied to the piezoelectric element, and the application diameter of the droplets can be adjusted by changing the amount of liquid ejected by opening and closing the nozzle once. EXAMPLES

[0020] A liquid ejection device according to an embodiment of the present invention will now be described. FIG. 1 is a schematic diagram showing a liquid agent ejection device according to the present embodiment, in which FIG. 1(a) is a schematic cross-sectional diagram of the device, and FIG. 1(b) and FIG. 1(c) are enlarged diagrams of A and B shown in FIG. 1(a), in which FIG. 1(b) shows the nozzle in an open state and FIG. 1(c) shows the nozzle in a closed state. FIG. 2 is a perspective view of the main part of the device, showing a block rod. The liquid material discharge device according to this embodiment is composed of a frame housing 10, a liquid material supply housing 20, and a heater housing 30.

[0021] As shown in FIG. 1( a ), a frame case 10 accommodates a driving source 11 and a housing 12 . A piezoelectric element is used as the driving source 11. The housing 12 accommodates a block rod 40 therein. The liquid supply housing 20 has a nozzle 21 that ejects the liquid, a liquid supply section 22 that supplies the liquid, a liquid supply path 23 that supplies the liquid to the nozzle 21, and a rod hole 25 in which at least a part of a piston rod 24 is disposed. The piston rod 24 opens and closes the nozzle 21. The heater housing 30 is disposed in contact with the liquid supply housing 20 and heats the liquid supply housing 20 .

[0022] The periphery of the piezoelectric element 11 is covered with a heat dissipating elastic resin 13. The outer peripheral surface of the heat dissipating elastic resin 13 is covered with a stainless steel cylindrical housing 14. A heat sink 15 is brought into contact with the stainless steel cylindrical housing 14. Therefore, the heat generated by the piezoelectric element 11 can be dissipated efficiently, so that the piezoelectric element 11 can be driven for a longer period of time at a high driving frequency.

[0023] The rod biasing means 16 biases the piston rod 24 in a direction Y to open the nozzle 21. In this embodiment, the rod biasing means 16 includes a first rod biasing means 16a that biases the block rod 40 against the housing 12 and a second rod biasing means 16b that biases the block rod 40 against the liquid material supply casing 20. A piston 17 is disposed between the piezoelectric element 11 and the block rod 40. The piston 17 is biased in the direction X of the piezoelectric element 11 by a pressure spring 18.

[0024] When a voltage is applied to the piezoelectric element 11, the piezoelectric element 11 is expanded, and when the piezoelectric element 11 is expanded, the piston 17 moves in the direction X of the block rod 40. The movement direction X of the piston 17 is a first displacement direction X, and the movement amount of the piston 17 is a first displacement amount. Therefore, a first displacement amount is imparted to the block rod 40 in the first displacement direction X by the movement of the piston 17. When the first displacement amount is applied to the block rod 40, the block rod 40 moves by a second displacement amount larger than the first displacement amount in a second displacement direction Y different from the first displacement direction X. When the block rod 40 moves in the second displacement direction Y, the piston rod 24 moves. In this manner, the block rod 40 is operated by the piezoelectric element 11, and the block rod 40 biases the piston rod 24 in the direction Y to close the nozzle 21.

[0025] As shown in Figures 1(a) and 2, the block rod 40 has a first block face 41 that receives the force generated by the piezoelectric element 11, a second block face 42 that is parallel to the second displacement direction Y and faces the first block face 41, and a third block face 43 that is not parallel to the second displacement direction Y and faces the first block face 41. That is, the first block surface 41 faces one surface of the housing 12, and the second block surface 42 and the third block surface 43 face the other surface of the housing 12. The one surface of the housing 12 faces the other surface of the housing 12. A plurality of cylindrical rollers 51 are arranged on the first block surface 41 . A buffer plate 52 that moves in a first displacement direction X in accordance with the movement of the piston 17 is disposed on one surface of the housing 12. The cylindrical roller 51 is disposed between the first block surface 41 and the buffer plate 52. A plurality of first diaphragms 53 are disposed between the second block surface 42 and the housing 12. In addition, a plurality of second diaphragms 54 are disposed between the third block surface 43 and the housing 12. The block rod 40 is moved in the second displacement direction Y by the cylindrical rollers 51, and is moved in the first displacement direction X and the second displacement direction Y by the first vibration plate 53 and the second vibration plate . The amount of movement of the block rod 40 caused by the first diaphragm 53 and the second diaphragm 54 in the second displacement direction Y is greater than the amount of movement in the first displacement direction X. In this way, the liquid agent discharge device according to the present embodiment can displace the block rod 40 by a second displacement amount larger than the first displacement amount caused by the piezoelectric element 11, thereby operating the piston rod 24.

[0026] As shown in Figures 1(b), 1(c), and 2, slits 55 are formed in the second block face 42, the third block face 43, and the housing 12, and the first diaphragm 53 and the second diaphragm 54 are fixed by the slits 55. In this embodiment, the first diaphragm 53 and the second diaphragm 54 are shown fitted into the slit 55, but the first diaphragm 53 and the second diaphragm 54 may be glued to the slit 55, or the first diaphragm 53 and the second diaphragm 54 may be brazed to the slit 55 using a metal such as solder. By using the first diaphragm 53 and the second diaphragm 54 between the block rod 40 and the housing 12, excessive movement of the block rod 40 during displacement can be further suppressed. The first diaphragm 53 may be provided parallel to the first displacement direction X, but is preferably disposed at a small angle α of 1 to 2° with respect to the first displacement direction X, as shown in FIG. 1(b).

[0027] The block rod 40 is made of a cemented carbide. By making the block rod 40 of a cemented carbide, it is possible to make it highly rigid and heavy, so that it becomes easier to close the nozzle 21, it becomes possible to discharge the liquid agent at a low voltage, and it is also possible to discharge a highly viscous liquid agent. Also, the block rod 40 can be made of silicon nitride or alumina. By making the block rod 40 of silicon nitride or alumina, the weight is reduced, the nozzle 21 becomes easier to open, and it can be driven at a higher frequency than if the block rod 40 were made of cemented carbide or stainless steel. The first vibration plate 53 and the second vibration plate 54 are made of stainless steel or a titanium alloy. By making the first vibration plate 53 and the second vibration plate 54 of stainless steel or a titanium alloy, the nozzle 21 can be opened and closed without wear and with a long life due to the rigidity and spring characteristics of the material.

[0028] 3A and 3B are perspective views of a block rod that can be used in the device, and FIG. 3(a) is a perspective view of a block rod according to another embodiment different from that in FIG. 2, and FIG. 3(b) is a perspective view of a block rod according to yet another embodiment. 3(a), a cavity 45 can also be formed in the block rod 40. By forming the cavity 45 in the block rod 40 in this way, the block rod 40 becomes lighter, the nozzle 21 becomes easier to open, and the block rod 40 can be driven at a higher frequency than if it were made of cemented carbide or stainless steel. 3(b), it is preferable that a weight material 46 can be added to the block rod 40. By adding the weight material 46 to the block rod 40 in this way, the weight can be adjusted to be heavier, and the liquid agent can be discharged at a lower voltage, making it easier to discharge a high-viscosity liquid agent. 2 and 3 may be one in which the block body 40A and the rod 40B are integrally molded, or one in which the block body 40A and the rod 40B are formed separately and the rod 40B is attached to the block body 40A by, for example, screwing. In this way, if the rod 40B can be attached to the block body 40A by screwing, the rod 40B can be replaced with a small-diameter rod or with a rod 40B to which a weight material 46 has been added. By making the rod 40B a thin rod, it is possible to increase the flexibility under pressure and improve the sealing performance, and by making the rod 40B heavier, it is possible to reduce the voltage.

[0029] FIG. 4 is an explanatory diagram showing the relationship between the first displacement amount and the second displacement amount in the device, where FIG. 4(a) is a diagram showing the movement of the first diaphragm, FIG. 4(b) is a graph showing the relationship between the first displacement amount and the second displacement amount, and FIG. 4(c) is a graph showing the relationship between the first displacement amount and the second displacement amount depending on the length of the first diaphragm. As shown in FIG. 4(a), if the length of first diaphragm 53 is L, the first displacement amount is L(1-cos θ) and the second displacement amount is Lsinθ. When the piezoelectric element 11 is in an expanded state, the block rod 40 moves to the other surface of the housing 12, the first vibration plate 53 and the second vibration plate 54 tilt, and the piston rod 24 moves in the direction Y to close the nozzle 21. In Figure 4(b), the horizontal axis represents the first displacement amount and the vertical axis represents the second displacement amount, with the calculated values ​​shown as solid lines and the experimental site shown as plots. FIG. 4(c) shows the first displacement amount on the horizontal axis and the second displacement amount on the vertical axis, with calculated values ​​shown when the length L of first diaphragm 53 is 0.7 mm, 1.4 mm, and 2.8 mm.

[0030] Figure 5 is a schematic diagram showing the installation of the liquid supply housing that constitutes the device, where Figure 5(a) is a side schematic diagram showing the main parts of the liquid supply housing installed on the frame housing, Figure 5(b) is an oblique view of the mounting fixture of the frame housing for installing the liquid supply housing, and Figure 5(c) is an oblique view of the liquid supply housing. A mounting fixture 60 is attached to the lower part of the frame housing 10. A plurality of wedge-shaped claws 61 are formed on the mounting fixture 60. The mounting fixture 60 includes a spring member 62 and an operating section 63. The operating section 63 can be operated to press the mounting fixture 60 in a direction approaching the frame housing 10, and the spring member 62 biases the mounting fixture 60 in a direction away from the frame housing 10. The liquid supply housing 20 is formed with a protrusion 26 that engages with the wedge-shaped claw 61. The liquid supply housing 20 is also formed with an engagement recess 27 that holds the heater housing 30.

[0031] Figure 6 is an oblique view of the essential parts showing the method of attaching the liquid supply housing to the frame housing, with Figure 6(a) showing a state in which the liquid supply housing is separated from the frame housing, Figure 6(b) showing a state in which the mounting fixture is pressed in a direction approaching the frame housing, Figure 6(c) showing a state in which the liquid supply housing is abutted against the frame housing, Figure 6(d) showing a state in which the liquid supply housing is attached to the frame housing by engaging the protrusion with the wedge-shaped claw, Figure 6(e) showing a state in which the heater housing is attached to the liquid supply housing, and Figure 6(f) being a cross-sectional view of the essential parts showing the attachment of the heater housing to the liquid supply housing.

[0032] Fig. 6(a) shows a state in which the solution supply housing 20 is separated from the frame housing 10 and the mounting fixture 60 is attached to the frame housing 10. In the state shown in Fig. 6(a), the mounting fixture 60 is biased in a direction (arrow A) away from the frame housing 10 by the biasing force of the spring member 62. From the state shown in FIG. 6(a), by pressing the operating portion 63 in the direction of the frame housing 10 (arrow B) as shown in FIG. 6(b), the wedge-shaped claw 61 formed on the mounting fixture 60 slides in the direction of the arrow C. With the operation portion 63 pressed, the upper surface of the liquid supply housing 20 is brought into contact with the lower surface of the frame housing 10, as shown in FIG. 6(c). 6(d), by releasing the pressure on the operating portion 63, the mounting fixture 60 slides along the lower surface of the frame housing 10 in the direction of arrow A due to the biasing force of the spring member 62. Therefore, the protrusion 26 engages with the wedge-shaped claw 61, and the liquid agent supplying housing 20 can be attached to the frame housing 10. After the liquid supply housing 20 is attached to the frame housing 10, the heater housing 30 is attached to the liquid supply housing 20 as shown in FIG. 6(e). The heater housing 30 is attached to the frame housing 10 by a pivot shaft 31, and the heater housing 30 is attached to the liquid supply housing 20 by rotating the heater housing 30 around the pivot shaft 31 and engaging the protrusion 32 provided on the heater housing 30 with the engagement recess 27. As shown in FIG. 6( f ), the tip of the protrusion 32 has a displaceable sphere 32 a , and the sphere 32 a engages with the engaging recess 27 . When removing the liquid supply housing 20 from the frame housing 10, the steps are carried out in the reverse order. In this way, by making the liquid supply housing 20 detachable from the frame housing 10, the liquid and the diameter of the nozzle 21 can be easily changed. As described above, according to this embodiment, the displacement from the piezoelectric element 11 can be efficiently transmitted to the piston rod 24 via the block rod 40 connected by the first vibration plate 53 and the second vibration plate 54, and the nozzle 21 can be opened and closed at high speed using the piezoelectric element 11 with low generating force and low capacitance.

[0033] FIG. 7 is an explanatory diagram of a liquid agent discharge control method using the same device. The horizontal axis in FIG. 7 represents time, and the vertical axis represents the voltage applied to the piezoelectric element. When a first voltage V1 is applied to the piezoelectric element 11, the piezoelectric element 11 is in an expanded state, and when a second voltage V2 is applied to the piezoelectric element 11, the piezoelectric element 11 is in a contracted state. In the liquid material ejection control method according to the present embodiment, the first voltage V1 is changed to set a position where the nozzle 21 is closed, and the second voltage V2 is changed to set a position where the nozzle 21 is open. As shown in FIG. 7, application of voltage Va causes the piston rod 24 to come into contact with the nozzle 21, while application of a second voltage V2, which is higher than the voltage Va, causes the piston rod 24 to press against the nozzle 21, thereby ensuring that the nozzle 21 is closed. In addition, the stroke of the piston rod 24 can be changed by the second voltage V2. The stroke of the piston rod 24 becomes larger by lowering the second voltage V2, and becomes smaller by increasing the second voltage V2. In this manner, in the liquid ejection control method according to the present embodiment, the pressing force of the piston rod 24 against the nozzle 21 is adjusted by changing the first voltage V1, and the application diameter of droplets of the liquid is adjusted by changing the second voltage V2. Therefore, by adjusting the first voltage V1 and the second voltage V2 applied to the piezoelectric element 11, the pressing force of the piston rod 24 against the nozzle 21 can be adjusted, and the application diameter of the droplets can be adjusted by changing the amount of liquid ejected by opening and closing the nozzle 21 once. [Industrial Applicability]

[0034] The present invention can use, as the liquid agent, for example, underfill, moisture-proof coating agent, UV adhesive, grease, oil, silver paste, paint, ink, primer, and solvent, and can intermittently eject these liquid agents at high speed. [Explanation of symbols]

[0035] 10 Frame housing 11 Driving source (piezoelectric element) 12. Housing 13 Heat dissipating elastic resin 14 Stainless steel cylindrical housing 15 Heat sink 16 Rod biasing means 16a First rod biasing means 16b Second rod biasing means 17 Piston 18 Pressure spring 20 Fluid Supply Housing 21 Nozzle 22 Liquid supply section 23 Liquid supply path 24 Piston rod 25 Rod hole 26 Protrusion 27 Engagement recess 30 Heater housing 31 Rotating shaft 32 Protrusion 32a Sphere 40 Block Rod 40A Block body 40B Rod 41 First Block Face 42 Second Block Face 43 Third Block Face 45 Cavity 46 Heavy materials 51 Cylindrical roller 52 Buffer plate 53 1st diaphragm 54 Second diaphragm 55 Slit 60 Mounting fixture 61 Cuneiform Nail 62 Spring material 63 Operation section Va Voltage V1 First voltage V2 Second voltage X direction (first displacement direction) Y direction (second displacement direction) α small angle

Claims

1. A nozzle for discharging a liquid agent; a liquid supply path for supplying the liquid to the nozzle; A piston rod for opening and closing the nozzle; a rod biasing means for biasing the piston rod in a direction to open the nozzle; and a block rod for biasing the piston rod in a direction to close the nozzle. A drive source for operating the block rod; Equipped with A piezoelectric element is used as the driving source, Applying a voltage to the piezoelectric element causes the piezoelectric element to expand; When the piezoelectric element is in the extended state, a first displacement amount is applied to the block rod in a first displacement direction, When the first displacement amount is applied to the block rod, the block rod moves in a second displacement direction different from the first displacement direction by a second displacement amount larger than the first displacement amount, The piston rod moves as the block rod moves in the second displacement direction. A liquid agent ejection device, a housing for receiving the block rod; The block rod has: a first block surface that receives a force generated by the piezoelectric element; a second block face parallel to the second displacement direction and facing the first block face; a third block surface facing the first block surface and not parallel to the second displacement direction; having A plurality of cylindrical rollers are disposed on the first block surface; a plurality of first diaphragms are disposed between the second block surface and the housing; a plurality of second diaphragms are disposed between the third block surface and the housing; The block rod is The cylindrical roller moves in the second displacement direction, The first vibration plate and the second vibration plate move in the first displacement direction and the second displacement direction. A liquid ejection device comprising:

2. The amount of movement of the block rod caused by the first diaphragm and the second diaphragm is greater in the second displacement direction than in the first displacement direction. The liquid ejection device according to claim 1 .

3. Slits are formed in the second block surface, the third block surface, and the housing, and the first diaphragm and the second diaphragm are fixed by the slits. The liquid ejection device according to claim 1 .

4. The first diaphragm and the second diaphragm are formed of stainless steel or a titanium alloy. The liquid ejection device according to claim 1 .

5. The block rod is made of cemented carbide. The liquid ejection device according to claim 1 .

6. The block rod can be fitted with weights. The liquid ejection device according to claim 1 .

7. The block rod is made of silicon nitride or alumina. The liquid ejection device according to claim 1 .

8. A cavity was formed in the block rod. The liquid ejection device according to claim 1 .

9. The piezoelectric element is covered with a heat dissipating elastic resin, The outer peripheral surface of the heat dissipating elastic resin is covered with a stainless steel cylindrical housing, A heat sink was placed in contact with the stainless steel cylindrical housing. The liquid ejection device according to claim 1 .

10. a liquid supply housing that forms the nozzle and the liquid supply path; a frame housing that accommodates the block rod, the driving source, and the housing; Equipped with The liquid supply housing is detachable from the frame housing. The liquid ejection device according to claim 1 .

11. A liquid agent ejection control method using the liquid agent ejection device according to any one of claims 1 to 10, comprising: applying a first voltage to the piezoelectric element to place the piezoelectric element in the expanded state; A second voltage is applied to the piezoelectric element to cause the piezoelectric element to contract; changing the first voltage to set a position where the nozzle is closed; changing the second voltage to set a position where the nozzle is open; adjusting a pressing force of the piston rod against the nozzle by changing the first voltage; The application diameter of the droplets of the liquid agent is adjusted by changing the second voltage. A liquid agent discharge control method comprising:

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