WO2019230816A1 - Liquid agent applying device - Google Patents

Liquid agent applying device Download PDF

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Publication number
WO2019230816A1
WO2019230816A1 PCT/JP2019/021334 JP2019021334W WO2019230816A1 WO 2019230816 A1 WO2019230816 A1 WO 2019230816A1 JP 2019021334 W JP2019021334 W JP 2019021334W WO 2019230816 A1 WO2019230816 A1 WO 2019230816A1
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WO
WIPO (PCT)
Prior art keywords
pressure chamber
diaphragm
piezoelectric element
intermediate member
liquid agent
Prior art date
Application number
PCT/JP2019/021334
Other languages
French (fr)
Japanese (ja)
Inventor
中谷　政次
賢司 前田
Original Assignee
日本電産株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電産株式会社 filed Critical 日本電産株式会社
Priority to JP2020522257A priority Critical patent/JP7212389B2/en
Publication of WO2019230816A1 publication Critical patent/WO2019230816A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • 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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/18—Ink recirculation systems

Definitions

  • the present invention relates to a liquid agent coating apparatus.
  • Piezoelectric elements that perform energy conversion from electrical energy to mechanical energy by the piezoelectric effect have excellent responsiveness. Therefore, in a wide range of fields such as semiconductors, printing, and chemicals, a liquid application device that discharges liquid onto the surface of an object Has been used. *
  • Patent Document 1 discloses a liquid agent coating apparatus including a head module having a pressure chamber for storing a liquid agent, a nozzle connected to the pressure chamber, and a piezoelectric element for discharging the liquid agent from the nozzle by deforming a wall surface of the pressure chamber. Is disclosed.
  • An object of this invention is to provide the liquid agent coating device which can prevent a piezoelectric element from being damaged and can improve the durability of the piezoelectric element.
  • the liquid application device includes a pressure chamber plate, a diaphragm, and a pressurizing drive unit.
  • the pressure chamber plate has a pressure chamber for storing the liquid agent.
  • the diaphragm is disposed on the pressure chamber plate.
  • the pressurizing drive unit applies pressurizing vibration to the diaphragm.
  • the pressurizing drive unit includes a piezoelectric element and an intermediate member. The intermediate member makes surface contact with the piezoelectric element and makes point contact with a point contact object located on the opposite side of the piezoelectric element.
  • the present invention it is possible to provide a liquid application device that can prevent the piezoelectric element from being damaged and improve the durability of the piezoelectric element.
  • FIG. 1 is a perspective view of the liquid application device.
  • FIG. 2 is an exploded perspective view of the liquid application device.
  • FIG. 3 is a cross-sectional view of the liquid application device.
  • FIG. 4 is a plan view of the diaphragm.
  • FIG. 5 is a plan view of the pressure chamber plate.
  • FIG. 6 is a perspective view of the pressure chamber plate.
  • FIG. 7 is a cross-sectional view of the diaphragm, pressure chamber plate, and seal.
  • FIG. 8 is a cross-sectional view of the liquid application device 100.
  • FIG. 9 is a perspective view of the intermediate member.
  • connection means that two members are fixed or coupled to each other.
  • Contact means that two members are in direct contact with each other, but the two members are not fixed or connected to each other.
  • parallel is a concept including not only a case of being physically parallel but also a case of being substantially parallel.
  • substantially parallel refers to a case where it is inclined within a range of 15 ° or less.
  • vertical is a concept that includes not only the case of being physically vertical but also the case of being substantially vertical.
  • substantially vertical refers to a case where it is inclined within a range of 15 ° or less.
  • FIG. 1 is a perspective view of the liquid agent coating apparatus 100.
  • FIG. 2 is an exploded perspective view of the liquid agent coating apparatus 100.
  • FIG. 3 is a cross-sectional view of the liquid application device 100. In FIG. 2, only the outline is shown so that the inside of the upper plate 6 can be seen. *
  • the liquid application device 100 includes a drive assembly 200 and a flow path assembly 300.
  • the drive assembly 200 is a unit that generates a pressing force for discharging the liquid agent.
  • the channel assembly 300 is a unit for supplying a liquid agent. *
  • the drive assembly 200 includes a base plate 1 and a pressurizing drive unit 2.
  • the pressurizing drive unit 2 includes a piezoelectric element 3, an intermediate member 4, and a weight member 5. *
  • the base plate 1 is disposed on the flow path assembly 300.
  • the base plate 1 is a member for fixing the position of the piezoelectric element 3 with respect to the flow path assembly 300.
  • the base plate 1 includes a first column part 11, a second column part 12, a beam part 13, and an accommodation recess 14. *
  • Each of the first and second column portions 11 and 12 is formed in a column shape.
  • the beam portion 13 connects the upper ends of the first and second column portions 11 and 12.
  • Each of the first and second pillar portions 11 and 12 is connected to an upper plate 6 described later. Thereby, the base plate 1 is positioned with respect to the flow path assembly 300.
  • the housing recess 14 is a space surrounded by the first pillar part 11, the second pillar part 12, and the beam part 13.
  • the piezoelectric element 3 is accommodated in the accommodating recess 14.
  • the base plate 1 only needs to be able to fix the position of the piezoelectric element 3 with respect to the flow path assembly 300, and the shape thereof is not particularly limited.
  • the piezoelectric element 3 is accommodated in the accommodating recess 14.
  • the piezoelectric element 3 is disposed between the beam portion 13 and the intermediate member 4.
  • One end portion of the piezoelectric element 3 is connected to the beam portion 13, and the other end portion of the piezoelectric element 3 is connected to the intermediate member 4.
  • the piezoelectric element 3 can be connected to each of the beam portion 13 and the intermediate member 4 using an adhesive such as an epoxy resin, for example.
  • the piezoelectric element 3 is displaced (stretched) in the z-axis direction in response to a drive pulse applied from a control unit (not shown). The displacement of the piezoelectric element 3 is transmitted to a diaphragm 7 described later via the intermediate member 4 and the weight member 5.
  • the piezoelectric element 3 includes at least one piezoelectric body and a pair of electrodes.
  • the piezoelectric element 3 may have a so-called partial electrode structure.
  • various known piezoelectric elements can be used as the piezoelectric element 3.
  • the piezoelectric element 3 according to the actual embodiment is formed in a prismatic shape, but may have other shapes. *
  • the intermediate member 4 is accommodated in the accommodating recess 14.
  • the intermediate member 4 is disposed between the piezoelectric element 3 and the weight member 5.
  • the intermediate member 4 is a member for suppressing stress concentration on a part of the piezoelectric element 3 when the piezoelectric element 3 is displaced.
  • the intermediate member 4 is connected to the piezoelectric element 3.
  • the intermediate member 4 can be connected to the piezoelectric element 3 using an adhesive such as an epoxy resin.
  • the intermediate member 4 is in surface contact with the piezoelectric element 3.
  • the intermediate member 4 is in point contact with the weight member 5.
  • the intermediate member 4 can be separated from and connected to the weight member 5. A detailed configuration of the intermediate member 4 will be described later. *
  • the weight member 5 is an example of a “point contact object” that the intermediate member 4 makes point contact with, and an example of a “receiving member” that receives a load from the intermediate member 4.
  • the weight member 5 is disposed between the intermediate member 4 and the diaphragm 7.
  • the weight member 5 is disposed in the through hole 6 c of the upper plate 6.
  • the weight member 5 is in contact with the intermediate member 4.
  • the weight member 5 can be separated from the intermediate member 4.
  • the weight member 5 is connected to the diaphragm 7.
  • the weight member 5 can be connected to the diaphragm 7 using, for example, an adhesive such as an epoxy resin or by welding. *
  • the displacement of the piezoelectric element 3 is transmitted to the weight member 5 through the intermediate member 4.
  • the weight member 5 functions as a weight and applies an inertial force to the diaphragm 7.
  • the diaphragm 7 can be displaced relatively larger than the minute displacement of the piezoelectric element 3.
  • the weight member 5 has an abutment surface 51 c that abuts against the diaphragm 7.
  • the contact surface 51 c is connected to the diaphragm 7.
  • the outer edge shape of the contact surface 51c is a circle.
  • the weight member 5 is formed in a columnar shape extending in the z-axis direction, but the weight member 5 only needs to function as a weight, and the shape and size thereof are not limited.
  • the flow path assembly 300 includes an upper plate 6, a diaphragm 7, a pressure chamber plate 8, and a seal 9. *
  • the upper plate 6 is disposed on the diaphragm 7.
  • the upper plate 6 contacts the diaphragm 7 on the diaphragm side surface 6S.
  • the diaphragm side surface 6S according to the present embodiment is a flat surface.
  • the upper plate 6 has a through hole 6c, a liquid supply path 6d, a drainage path 6e, and a diaphragm side surface 6S. *
  • the liquid supply path 6d guides the liquid supplied from a storage tank (not shown) through the barrel joint 61 to an inflow path 81 of the pressure chamber plate 8 described later.
  • a barrel joint 61 for connecting a liquid supply pipe (not shown) extending from the storage tank is attached to the inlet of the liquid supply path 6d.
  • the drainage path 6e guides the liquid discharged from the outflow path 84 of the pressure chamber plate 8 described later to the outside.
  • a drainage joint 62 for connecting a drainage pipe (not shown) extending to the outside is attached to the outlet of the drainage path 6e.
  • the diaphragm 7 is formed in a plate shape extending in the x-axis direction and the y-axis direction.
  • the x-axis direction is a direction perpendicular to the y-axis direction and the z-axis direction.
  • the y-axis direction is a direction perpendicular to the x-axis direction and the z-axis direction.
  • the diaphragm 7 is disposed on the pressure chamber plate 8.
  • the diaphragm 7 is sandwiched between the upper plate 6 and the pressure chamber plate 8.
  • the diaphragm 7 contacts the upper plate 6 on the upper plate side surface 7S.
  • the diaphragm 7 contacts the pressure chamber plate 8 on the pressure chamber plate side surface 7T.
  • FIG. 3 is a plan view of the diaphragm 7 as viewed from the upper plate side surface 7S.
  • the diaphragm 7 has a liquid supply hole 7e, a liquid discharge hole 7f, and a flexible region 7g. *
  • the liquid supply hole 7e is connected to a liquid supply path 6d of the upper plate 6 and an inflow path 81 of the pressure chamber plate 8 described later.
  • the drain hole 7f is connected to a drain path 6e of the upper plate 6 and an outflow path 84 of the pressure chamber plate 8 described later.
  • the flexible region 7 g is a part of the diaphragm 7.
  • the flexible region 7 g is a region that does not contact the upper plate 6 and the pressure chamber plate 8 in the diaphragm 7.
  • the pressing drive unit 2 is disposed on the flexible region 7g.
  • the contact surface 51c of the weight member 5 is connected to the flexible region 7g.
  • the outer edge shape of the flexible region 7 g in plan view is the same circle as the contact surface 51 c of the weight member 5. *
  • the flexible region 7g covers a pressure chamber 82 of the pressure chamber plate 8 described later. Displacement of the piezoelectric element 3 is transmitted to the flexible region 7g via the intermediate member 4 and the weight member 5, whereby the flexible region 7g elastically vibrates in the z-axis direction. Thus, only the flexible region 7g substantially functions as the vibration film of the diaphragm 7.
  • the pressure chamber plate 8 is formed in a plate shape extending in the x-axis direction and the y-axis direction.
  • a diaphragm 7 is arranged on the pressure chamber plate 8.
  • the pressure chamber plate 8 is arranged in parallel with the diaphragm 7.
  • the pressure chamber plate 8 contacts the diaphragm 7 at the contact surface 8S.
  • the size of the pressure chamber plate 8 is equivalent to the size of the diaphragm 7. *
  • FIG. 5 is a plan view of the pressure chamber plate 8 as viewed from the contact surface 8S.
  • FIG. 6 is a perspective view of the pressure chamber plate 8 as seen from the contact surface 8S.
  • 7 is a cross-sectional view of the diaphragm 7, the pressure chamber plate 8, and the seal 9 taken along the line AA in FIG.
  • FIG. 7 is a cross section perpendicular to the contact surface 8S. *
  • the pressure chamber plate 8 has an inflow path 81, a pressure chamber 82, a nozzle 83, an outflow path 84, and a seal groove 85.
  • the inflow channel 81 is configured by a first recess C1 formed in the contact surface 8S.
  • the inflow path 81 is formed by the first recess C ⁇ b> 1 being blocked by the diaphragm 7.
  • the inflow path 81 extends along the contact surface 8S.
  • the inflow channel 81 according to the present embodiment extends in parallel with the x-axis direction. In this way, instead of forming a through hole in the pressure chamber plate 8, the inflow passage 81 is formed by closing the recess formed in the surface of the pressure chamber plate 8 with the diaphragm 7. Therefore, since the pressure chamber plate 8 can be thinned, the liquid agent coating apparatus 100 can be downsized.
  • the inflow channel 81 has a rectangular cross section.
  • the width W1 of the inflow channel 81 in the y-axis direction (an example of the surface direction) parallel to the contact surface 8S is larger than the height H1 of the inflow channel 81 in the z-axis direction (an example of the thickness direction) perpendicular to the contact surface 8S. That is, the ratio of the height H1 to the width W1 of the inflow channel 81 is smaller than 1. Therefore, since the pressure chamber plate 8 can be made thinner by forming the inflow passage 81 flat, the volume change rate of the pressure chamber 82 corresponding to the vibration amount of the diaphragm 7 can be reduced by reducing the volume of the pressure chamber 82. Can be increased. As a result, even if the applied pressure of the diaphragm 7 is small, a large pressurization can be applied to the liquid in the pressure chamber 82 and the applied pressure can be efficiently transmitted. 83 can be discharged. *
  • the inflow path 81 is connected to the liquid supply hole 7 e of the diaphragm 7.
  • the liquid agent is supplied to the inflow path 81 through the liquid supply hole 7 e of the diaphragm 7 and the liquid supply path 6 d of the upper plate 6.
  • the other end of the inflow passage 81 is connected to the pressure chamber 82.
  • the liquid agent supplied to the inflow path 81 flows into the pressure chamber 82.
  • the detailed configuration of the inflow channel 81 will be described later. *
  • the pressure chamber 82 is configured by a second recess C2 formed in the contact surface 8S.
  • the pressure chamber 82 is formed by closing the second recess C ⁇ b> 2 with the diaphragm 7. Accordingly, since the pressure chamber plate 8 can be made thin, the volume change rate of the pressure chamber 82 corresponding to the vibration amount of the diaphragm 7 can be increased by reducing the volume of the pressure chamber 82.
  • the outer edge shape of the second recess C ⁇ b> 2 (that is, the pressure chamber 82) is circular like the contact surface 51 c of the weight member 5 and the flexible region 7 g of the diaphragm 7.
  • the range of the flexible region 7g in the diaphragm 7 is defined by the outer edge of the second recess C2.
  • the pressure chamber 82 stores the liquid agent flowing in from the inflow passage 81.
  • the liquid agent stored in the pressure chamber 82 is discharged from the nozzle 83. Further, the liquid agent stored in the pressure chamber 82 may be discharged from the outflow path 84 in order to remove bubbles mixed in the pressure chamber 82.
  • the detailed configuration of the pressure chamber 82 will be described later. *
  • the nozzle 83 continues to the pressure chamber 82.
  • the nozzle 83 is a hole that penetrates the pressure chamber plate 8.
  • the nozzle 83 opens on the outer surface 8T of the pressure chamber plate 8.
  • the nozzle 83 faces the diaphragm 7 in the z-axis direction.
  • the nozzle 83 is disposed inside the pressure chamber 82 in the plan view of the contact surface 8S.
  • the nozzle 83 is disposed at the center of the pressure chamber 82 in a plan view of the contact surface 8S.
  • the outer edge shape of the nozzle 83 is circular like the pressure chamber 82.
  • the liquid agent stored in the pressure chamber 82 is discharged from the nozzle 83 to the outside. The detailed configuration of the nozzle 83 will be described later. *
  • the outflow path 84 is configured by a third recess C3 formed in the contact surface 8S.
  • the outflow path 84 is formed by the third recess C ⁇ b> 3 being closed with the diaphragm 7. Accordingly, since the pressure chamber plate 8 can be made thin, the volume change rate of the pressure chamber 82 corresponding to the vibration amount of the diaphragm 7 can be increased by reducing the volume of the pressure chamber 82.
  • the outflow path 84 extends along the contact surface 8S.
  • the outflow channel 84 according to the present embodiment extends in parallel with the x-axis direction.
  • One end of the outflow passage 84 is connected to the pressure chamber 82.
  • the other end of the inflow passage 81 is connected to the drain hole 7 f of the diaphragm 7.
  • the seal groove 85 is formed on the contact surface 8S.
  • the seal groove 85 is provided around the first to third recesses C1 to C3 in the plan view of the contact surface 8S.
  • the seal groove 85 is provided along the outer edge of the first to third recesses C1 to C3.
  • the seal groove 85 surrounds the entire first to third recesses C1 to C3.
  • the seal groove 85 is formed in an annular shape.
  • the seal 9 is sandwiched between the diaphragm 7 and the pressure chamber plate 8, as shown in FIG.
  • the seal 9 is disposed in the seal groove 85 of the pressure chamber plate 8.
  • the seal 9 surrounds the inflow path 81, the pressure chamber 82, and the outflow path 84 of the pressure chamber plate 8.
  • the seal 9 is pressed against the diaphragm 7 while being disposed in the seal groove 85. Thereby, the liquid tightness and air tightness of the inflow path 81, the pressure chamber 82, and the outflow path 84 are ensured.
  • the seal 9 can be made of an elastic member such as rubber. *
  • the ratio of the flow path resistance in the nozzle 83 to the flow path resistance in the inflow path 81 is 1 or more. That is, the flow path resistance in the nozzle 83 is the same as the flow path resistance in the inflow path 81 or greater than the flow path resistance in the inflow path 81. Therefore, when the liquid agent is continuously discharged from the nozzle 83, the liquid agent can be smoothly replenished from the inflow path 81 to the pressure chamber 82.
  • the ratio of the channel resistance in the nozzle 83 to the channel resistance in the inflow channel 81 is preferably 2 or less. That is, the flow path resistance in the nozzle 83 is preferably not more than twice the flow path resistance in the inflow path 81.
  • the flow path resistance in the inflow path 81 is calculated by performing a cross-sectional analysis over the entire length of the inflow path 81.
  • the flow path resistance in the nozzle 83 is calculated by performing a cross-sectional analysis over the entire length of the nozzle 83.
  • the channel resistance can be calculated from the following general formula (1) used for calculating the pressure loss. *
  • p1 ⁇ p2 U ⁇ (8 ⁇ ⁇ ⁇ L) / ( ⁇ ⁇ r4)
  • p1 ⁇ p2 is a pressure loss
  • p1 is a pressure (unit) on the inflow side. : Pa)
  • p2 is the pressure on the outflow side (unit: Pa).
  • ⁇ is a viscosity coefficient (unit: N ⁇ sec / m 2 )
  • L is a channel length (unit: m)
  • r is a channel radius (unit: m).
  • U is a flow rate (unit: m 3 / sec).
  • FIG. 8 is a cross-sectional view of the liquid application device 100 taken along line BB in FIG.
  • FIG. 8 is a cross section perpendicular to the contact surface 8 ⁇ / b> S of the pressure chamber plate 8.
  • the pressure chamber 82 (second recess C ⁇ b> 2) is formed in an overall tapered shape toward the nozzle 83.
  • the pressure chamber 82 has a tapered shape toward the nozzle 83. Therefore, the width W ⁇ b> 2 of the pressure chamber 82 in the x-axis direction (an example of the surface direction) parallel to the contact surface 8 ⁇ / b> S becomes narrower as it approaches the nozzle 83 from the diaphragm 7.
  • the volume of the pressure chamber 82 can be reduced, the volume change rate of the pressure chamber 82 corresponding to the vibration amount of the diaphragm 7 (specifically, the flexible region 7g) can be increased.
  • the pressure chamber plate 8 is made thin by configuring the inflow passage 81 with the first recess C1, and the volume of the pressure chamber 82 can be easily reduced. The pressure can be transmitted to the liquid agent.
  • the thickness of the pressure chamber plate 8 around the nozzle 83 can be increased as compared with the case where the pressure chamber 82 is formed in a columnar shape, even if the total length of the nozzle 83 is shortened to reduce the channel resistance, The rigidity of the pressure chamber plate 8 can be ensured.
  • the total width W2max of the pressure chamber 82 in the x-axis direction is larger than the total height H2max of the pressure chamber 82 in the z-axis direction (an example of the thickness direction).
  • the total height H2max of the pressure chamber 82 is the distance between the diaphragm 7 and the nozzle 83 in the z-axis direction.
  • the ratio of the total width W2max to the total height H2max of the pressure chamber 82 is preferably 10 or more. That is, the total width W2max of the pressure chamber 82 is preferably 10 times or more the total height H2max.
  • the cross section of the pressure chamber 82 has a truncated cone shape.
  • the pressure chamber 82 has a cross-sectional shape in which a vertex portion is removed from a cone whose bottom surface is the flexible region 7 g of the diaphragm 7.
  • the inner side surface 82S of the pressure chamber 82 is a partial conical surface from which the apex portion of the conical surface is removed.
  • the pressure chamber 82 only needs to be tapered toward the nozzle 83, and the cross section is not limited to the truncated cone shape.
  • the nozzle 83 is formed in a taper shape as a whole toward the outer surface 8T.
  • the nozzle 83 has a tapered shape toward the outer surface 8T. Therefore, the width W ⁇ b> 3 of the nozzle 83 in the x-axis direction parallel to the contact surface 8 ⁇ / b> S decreases as the distance from the pressure chamber 82 increases.
  • the cross section of the nozzle 83 has a truncated cone shape.
  • the nozzle 83 has a cross-sectional shape in which a vertex portion is removed from a cone having the pressure chamber 82 as a bottom surface.
  • the inner side surface 83S of the nozzle 83 is a partial conical surface from which the apex portion of the conical surface is removed.
  • the nozzle 83 should just be formed in the taper shape toward the outer surface 8T, and the cross section is not restricted to a truncated cone shape.
  • the inner surface 83S of the nozzle 83 has a larger inclination with respect to the contact surface 8S than the inner surface 82S of the pressure chamber 82. That is, the inner side surface 83S of the nozzle 83 is more inclined with respect to the xy plane than the inner side surface 82S of the pressure chamber 82. Therefore, since the thickness of the pressure chamber plate 8 around the nozzle 83 can be increased, the rigidity around the nozzle 83 can be ensured.
  • the central axis 83 ⁇ / b> A of the nozzle 83 coincides with the central axis 82 ⁇ / b> A of the pressure chamber 82. Accordingly, the applied pressure can be efficiently transmitted from the pressure chamber 82 to the nozzle 83, so that the liquid agent can be discharged more smoothly from the nozzle 83.
  • the central axis 2A of the pressurizing drive unit 2 coincides with the central axis 82A of the pressure chamber 82 and the central axis 83A of the nozzle 83, respectively. Accordingly, the applied pressure can be efficiently transmitted from the pressurizing drive unit 2 to the pressure chamber 82, so that the liquid agent can be discharged more smoothly from the nozzle 83.
  • FIG. 9 is a perspective view of the intermediate member 4.
  • the intermediate member 4 is connected to the tip of the piezoelectric element 3.
  • the intermediate member 4 has a flat surface 4 ⁇ / b> S connected to the piezoelectric element 3.
  • the plane 4S is formed in a planar shape.
  • the intermediate member 4 has a curved surface 4T provided on the opposite side of the flat surface 4S.
  • the curved surface 4T makes point contact with the weight member 5 (see FIG. 8).
  • the curved surface 4T may be a part of a spherical surface or a curved surface.
  • the intermediate member 4 which concerns on this embodiment is formed in hemispherical shape, it should just have the plane 4S and the curved surface 4T, and the shape and size are not restrict
  • the intermediate member 4 is preferably made of a material having a hardness higher than that of the weight member 5.
  • the intermediate member 4 is preferably made of a material having higher wear resistance than the weight member 5. Examples of such a material include martensitic stainless steel (for example, SUS440), ceramic material (for example, alumina), and ruby. This can reduce the number of times that the intermediate member 4 that is normally connected to the piezoelectric element 3 with an adhesive is worn or deformed and replaces the intermediate member 4 together with the piezoelectric element 3, thereby reducing maintenance time and maintenance cost. it can. *
  • the pressurizing drive unit 2 includes a weight member 5 disposed on the diaphragm 7, an intermediate member 4 disposed on the weight member 5, and a piezoelectric element disposed on the intermediate member 4. 3.
  • the intermediate member 4 is in point contact with the weight member 5 and in surface contact with the piezoelectric element 3. Therefore, the force applied from the weight member 5 to the piezoelectric element 3 can be transmitted evenly through the intermediate member 4. As a result, it is possible to suppress the occurrence of biased compressive stress inside the piezoelectric element 3, thereby preventing the piezoelectric element 3 from being damaged and improving the durability.
  • the weight member 5 disposed on the piezoelectric element 3 and the diaphragm 7 is a point contact, the assembly position of the piezoelectric element 3 with respect to the diaphragm 7, particularly the tolerance of the assembly angle can be relaxed. The cost of manufactured parts can be reduced and the assembly process can be simplified.
  • the inflow path 81, the pressure chamber 82, and the outflow path 84 are formed on the contact surface 8S. It may be formed. In this case, the liquid agent application device 100 may not include the seal 9. *
  • the base plate 1 is positioned with respect to the flow path assembly 300 by connecting the first and second pillar portions 11 and 12 to the upper plate 6.
  • the positioning method can be changed as appropriate.
  • the pressing drive unit 2 includes the piezoelectric element 3, the intermediate member 4, and the weight member 5, but may not include the weight member 5.
  • the intermediate member 4 directly makes point contact with the diaphragm 7, the diaphragm 7 becomes a “point contact object”.
  • the members (upper plate 6, diaphragm 7, and pressure chamber plate 8) in contact with the liquid agent in the flow path assembly 300 are made of a material having corrosion resistance to the liquid agent. It is preferable to do. However, various constituent materials can be employed as long as the surface in contact with the liquid agent is covered with a corrosion-resistant film.

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

Abstract

[Problem] To provide a liquid agent applying device with which it is possible to prevent damage to a piezoelectric element and to improve the durability of the piezoelectric element. [Solution] A liquid agent applying device 100 is provided with a pressure chamber plate 8, a diaphragm 7, and a pressurization drive unit 2. The pressure chamber plate 8 includes a pressure chamber 82 for storing a liquid agent. The diaphragm 7 is disposed on the pressure chamber plate 8. The pressurization drive unit 2 applies pressurizing vibrations to the diaphragm 7. The pressurization drive unit 2 includes a weight member 5 disposed on the diaphragm 7, an intermediate member 4 disposed on the weight member 5, and a piezoelectric element 3 disposed on the intermediate member 4. The intermediate member 4 is in point contact with the weight member 5 and in surface contact with the piezoelectric element 3.

Description

液剤塗布装置Liquid application device
本発明は、液剤塗布装置に関する。 The present invention relates to a liquid agent coating apparatus.
圧電効果によって電気エネルギから機械エネルギへのエネルギ変換を行う圧電素子は、応答性に優れているため、半導体、印刷、化学薬品などの広い分野において、液剤を対象物の表面に吐出する液剤塗布装置に利用されている。　 Piezoelectric elements that perform energy conversion from electrical energy to mechanical energy by the piezoelectric effect have excellent responsiveness. Therefore, in a wide range of fields such as semiconductors, printing, and chemicals, a liquid application device that discharges liquid onto the surface of an object Has been used. *
特許文献１には、液剤を貯留する圧力室と、前記圧力室に連なるノズルとを有するヘッドモジュールと、圧力室の壁面を変形させることによってノズルから液剤を吐出させる圧電素子とを備える液剤塗布装置が開示されている。 Patent Document 1 discloses a liquid agent coating apparatus including a head module having a pressure chamber for storing a liquid agent, a nozzle connected to the pressure chamber, and a piezoelectric element for discharging the liquid agent from the nozzle by deforming a wall surface of the pressure chamber. Is disclosed.
日本国公開公報：特開２０１６－１８７８９２号公報Japanese publication: JP 2016-187892 A
しかしながら、特許文献１に記載の液剤塗布装置では、圧電素子に偏った圧縮応力がかかることによって、圧電素子が破損するおそれ、あるいは、圧電素子の耐久性が低下するおそれがある。　 However, in the liquid agent coating apparatus described in Patent Document 1, there is a risk that the piezoelectric element may be damaged or the durability of the piezoelectric element may be reduced due to the biased compressive stress applied to the piezoelectric element. *
本発明は、圧電素子の破損を防止し、かつ圧電素子の耐久性を向上できる液剤塗布装置の提供を目的とする。 An object of this invention is to provide the liquid agent coating device which can prevent a piezoelectric element from being damaged and can improve the durability of the piezoelectric element.
本発明の一つの態様に係る液剤塗布装置は、圧力室プレートと、ダイヤフラムと、加圧用駆動部とを備える。圧力室プレートは、液剤を貯留する圧力室を有する。ダイヤフラムは、圧力室プレート上に配置される。加圧用駆動部は、ダイヤフラムに加圧振動を加える。加圧用駆動部は、圧電素子と中間部材とを有する。中間部材は、圧電素子と面接触し、かつ、圧電素子の反対側に位置する点接触対象物と点接触する。 The liquid application device according to one aspect of the present invention includes a pressure chamber plate, a diaphragm, and a pressurizing drive unit. The pressure chamber plate has a pressure chamber for storing the liquid agent. The diaphragm is disposed on the pressure chamber plate. The pressurizing drive unit applies pressurizing vibration to the diaphragm. The pressurizing drive unit includes a piezoelectric element and an intermediate member. The intermediate member makes surface contact with the piezoelectric element and makes point contact with a point contact object located on the opposite side of the piezoelectric element.
本発明の一つの態様によれば、圧電素子の破損を防止し、かつ圧電素子の耐久性を向上できる液剤塗布装置を提供することができる。 According to one aspect of the present invention, it is possible to provide a liquid application device that can prevent the piezoelectric element from being damaged and improve the durability of the piezoelectric element.
図１は、液剤塗布装置の斜視図である。FIG. 1 is a perspective view of the liquid application device. 図２は、液剤塗布装置の分解斜視図である。FIG. 2 is an exploded perspective view of the liquid application device. 図３は、液剤塗布装置の断面図である。FIG. 3 is a cross-sectional view of the liquid application device. 図４は、ダイヤフラムの平面図である。FIG. 4 is a plan view of the diaphragm. 図５は、圧力室プレートの平面図である。FIG. 5 is a plan view of the pressure chamber plate. 図６は、圧力室プレートの斜視図である。FIG. 6 is a perspective view of the pressure chamber plate. 図７は、ダイヤフラム、圧力室プレート及びシールの断面図である。FIG. 7 is a cross-sectional view of the diaphragm, pressure chamber plate, and seal. 図８は、液剤塗布装置１００の断面図である。FIG. 8 is a cross-sectional view of the liquid application device 100. 図９は、中間部材の斜視図である。FIG. 9 is a perspective view of the intermediate member.
以下、図面を参照しながら、本発明の一実施形態に係る液剤塗布装置について説明する。ただし、本発明の範囲は、以下の実施の形態に限定されるものではなく、本発明の技術的思想の範囲内で任意に変更可能である。また、以下の図面においては、各構成をわかりやすくするために、各構造における縮尺および数等を、実際の構造における縮尺および数等と異ならせる場合がある。　 Hereinafter, a liquid application device according to an embodiment of the present invention will be described with reference to the drawings. However, the scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. In the following drawings, the scale and number of each structure may be different from the scale and number of the actual structure in order to make each configuration easy to understand. *
本明細書において、「接続」と「接触」は、異なる概念である。「接続」とは、２つの部材が互いに固定又は連結されていることを意味する。「接触」とは、２つの部材が直接的に接する状態にあるものの、２つの部材は互いに固定又は連結されていないことを意味する。　 In this specification, “connection” and “contact” are different concepts. “Connection” means that two members are fixed or coupled to each other. “Contact” means that two members are in direct contact with each other, but the two members are not fixed or connected to each other. *
本明細書において、「平行」とは、物理的に厳密な意味で平行な場合だけでなく、実質的に平行な場合をも含む概念である。実質的に平行とは、１５°以下の範囲で傾いている場合をいう。また、「垂直」とは、物理的に厳密な意味で垂直な場合だけでなく、実質的に垂直な場合をも含む概念である。実質的に垂直とは、１５°以下の範囲で傾いている場合をいう。　 In this specification, the term “parallel” is a concept including not only a case of being physically parallel but also a case of being substantially parallel. The term “substantially parallel” refers to a case where it is inclined within a range of 15 ° or less. In addition, “vertical” is a concept that includes not only the case of being physically vertical but also the case of being substantially vertical. The term “substantially vertical” refers to a case where it is inclined within a range of 15 ° or less. *
（液剤塗布装置１００）　本実施形態に係る液剤塗布装置１００の構成について、図面を参照しながら説明する。図１は、液剤塗布装置１００の斜視図である。図２は、液剤塗布装置１００の分解斜視図である。図３は、液剤塗布装置１００の断面図である。図２では、アッパープレート６の内部が見えるように輪郭だけが図示されている。　 (Liquid coating device 100) The configuration of the liquid coating device 100 according to the present embodiment will be described with reference to the drawings. FIG. 1 is a perspective view of the liquid agent coating apparatus 100. FIG. 2 is an exploded perspective view of the liquid agent coating apparatus 100. FIG. 3 is a cross-sectional view of the liquid application device 100. In FIG. 2, only the outline is shown so that the inside of the upper plate 6 can be seen. *
液剤塗布装置１００は、駆動アセンブリ２００及び流路アセンブリ３００を備える。駆動アセンブリ２００は、液剤を吐出するための加圧力を発生させるユニットである。流路アセンブリ３００は、液剤を供給するためのユニットである。　 The liquid application device 100 includes a drive assembly 200 and a flow path assembly 300. The drive assembly 200 is a unit that generates a pressing force for discharging the liquid agent. The channel assembly 300 is a unit for supplying a liquid agent. *
（駆動アセンブリ２００）　駆動アセンブリ２００は、ベースプレート１及び加圧用駆動部２を有する。加圧用駆動部２は、圧電素子３、中間部材４、及び錘部材５を含む。　 (Drive Assembly 200) The drive assembly 200 includes a base plate 1 and a pressurizing drive unit 2. The pressurizing drive unit 2 includes a piezoelectric element 3, an intermediate member 4, and a weight member 5. *
［ベースプレート１］　ベースプレート１は、流路アセンブリ３００上に配置される。ベースプレート１は、流路アセンブリ３００に対して圧電素子３の位置を固定するための部材である。ベースプレート１は、第１柱部１１、第２柱部１２、梁部１３、及び収容凹部１４を有する。　 [Base plate 1] The base plate 1 is disposed on the flow path assembly 300. The base plate 1 is a member for fixing the position of the piezoelectric element 3 with respect to the flow path assembly 300. The base plate 1 includes a first column part 11, a second column part 12, a beam part 13, and an accommodation recess 14. *
第１及び第２柱部１１，１２それぞれは、柱状に形成される。梁部１３は、第１及び第２柱部１１，１２それぞれの上端部を連結する。第１及び第２柱部１１，１２それぞれは、後述するアッパープレート６に接続される。これにより、ベースプレート１は、流路アセンブリ３００に対して位置決めされる。　 Each of the first and second column portions 11 and 12 is formed in a column shape. The beam portion 13 connects the upper ends of the first and second column portions 11 and 12. Each of the first and second pillar portions 11 and 12 is connected to an upper plate 6 described later. Thereby, the base plate 1 is positioned with respect to the flow path assembly 300. *
収容凹部１４は、第１柱部１１、第２柱部１２、及び梁部１３によって囲まれた空隙である。収容凹部１４には、圧電素子３が収容される。　 The housing recess 14 is a space surrounded by the first pillar part 11, the second pillar part 12, and the beam part 13. The piezoelectric element 3 is accommodated in the accommodating recess 14. *
なお、ベースプレート１は、流路アセンブリ３００に対して圧電素子３の位置を固定できればよく、その形状は特に制限されない。　 The base plate 1 only needs to be able to fix the position of the piezoelectric element 3 with respect to the flow path assembly 300, and the shape thereof is not particularly limited. *
［圧電素子３］　圧電素子３は、収容凹部１４に収容される。圧電素子３は、梁部１３と中間部材４との間に配置される。圧電素子３の一端部は梁部１３に接続され、圧電素子３の他端部は中間部材４に接続される。圧電素子３は、例えばエポキシ樹脂などの接着剤を用いて梁部１３及び中間部材４のそれぞれに接続することができる。　 [Piezoelectric element 3] The piezoelectric element 3 is accommodated in the accommodating recess 14. The piezoelectric element 3 is disposed between the beam portion 13 and the intermediate member 4. One end portion of the piezoelectric element 3 is connected to the beam portion 13, and the other end portion of the piezoelectric element 3 is connected to the intermediate member 4. The piezoelectric element 3 can be connected to each of the beam portion 13 and the intermediate member 4 using an adhesive such as an epoxy resin, for example. *
圧電素子３は、図示しない制御部から印加される駆動パルスに応じて、ｚ軸方向に変位（伸縮）する。圧電素子３の変位は、中間部材４及び錘部材５を介して、後述するダイヤフラム７に伝達される。圧電素子３は、１つの圧電体と一対の電極とを少なくとも備える。圧電素子３は、いわゆる部分電極構造を有していてもよい。圧電素子３としては周知の種々の圧電素子を用いることができる。本実際形態に係る圧電素子３は、角柱状に形成されているが、他の形状であってもよい。　 The piezoelectric element 3 is displaced (stretched) in the z-axis direction in response to a drive pulse applied from a control unit (not shown). The displacement of the piezoelectric element 3 is transmitted to a diaphragm 7 described later via the intermediate member 4 and the weight member 5. The piezoelectric element 3 includes at least one piezoelectric body and a pair of electrodes. The piezoelectric element 3 may have a so-called partial electrode structure. As the piezoelectric element 3, various known piezoelectric elements can be used. The piezoelectric element 3 according to the actual embodiment is formed in a prismatic shape, but may have other shapes. *
［中間部材４］　中間部材４は、収容凹部１４に収容される。中間部材４は、圧電素子３と錘部材５との間に配置される。中間部材４は、圧電素子３が変位する際に、圧電素子３の一部に応力が集中することを抑制するための部材である。　 [Intermediate member 4] The intermediate member 4 is accommodated in the accommodating recess 14. The intermediate member 4 is disposed between the piezoelectric element 3 and the weight member 5. The intermediate member 4 is a member for suppressing stress concentration on a part of the piezoelectric element 3 when the piezoelectric element 3 is displaced. *
中間部材４は、圧電素子３に接続される。中間部材４は、例えばエポキシ樹脂などの接着剤を用いて圧電素子３に接続することができる。中間部材４は、圧電素子３と面接触する。中間部材４は、錘部材５と点接触する。中間部材４は、錘部材５と離接可能である。中間部材４の詳細な構成については後述する。　 The intermediate member 4 is connected to the piezoelectric element 3. The intermediate member 4 can be connected to the piezoelectric element 3 using an adhesive such as an epoxy resin. The intermediate member 4 is in surface contact with the piezoelectric element 3. The intermediate member 4 is in point contact with the weight member 5. The intermediate member 4 can be separated from and connected to the weight member 5. A detailed configuration of the intermediate member 4 will be described later. *
［錘部材５］　錘部材５は、中間部材４が点接触する「点接触対象物」の一例であり、かつ、中間部材４からの荷重を受ける「受け部材」の一例である。錘部材５は、中間部材４とダイヤフラム７との間に配置される。錘部材５は、アッパープレート６の貫通孔６ｃ内に配置される。錘部材５は、中間部材４と接触する。錘部材５は、中間部材４と離接可能である。錘部材５は、ダイヤフラム７に接続される。錘部材５は、例えばエポキシ樹脂などの接着剤を用いて、或いは溶接によって、ダイヤフラム７に接続することができる。　 [Weight Member 5] The weight member 5 is an example of a “point contact object” that the intermediate member 4 makes point contact with, and an example of a “receiving member” that receives a load from the intermediate member 4. The weight member 5 is disposed between the intermediate member 4 and the diaphragm 7. The weight member 5 is disposed in the through hole 6 c of the upper plate 6. The weight member 5 is in contact with the intermediate member 4. The weight member 5 can be separated from the intermediate member 4. The weight member 5 is connected to the diaphragm 7. The weight member 5 can be connected to the diaphragm 7 using, for example, an adhesive such as an epoxy resin or by welding. *
錘部材５には、中間部材４を介して、圧電素子３の変位が伝達される。錘部材５に圧電素子３の変位が伝達されると、錘部材５は錘として機能してダイヤフラム７に慣性力を付与する。これにより、圧電素子３の微小な変位に比べて、ダイヤフラム７を相対的に大きく変位させることができる。　 The displacement of the piezoelectric element 3 is transmitted to the weight member 5 through the intermediate member 4. When the displacement of the piezoelectric element 3 is transmitted to the weight member 5, the weight member 5 functions as a weight and applies an inertial force to the diaphragm 7. Thereby, the diaphragm 7 can be displaced relatively larger than the minute displacement of the piezoelectric element 3. *
錘部材５は、ダイヤフラム７に当接する当接面５１ｃを有する。当接面５１ｃは、ダイヤフラム７に接続される。本実施形態において、当接面５１ｃの外縁形状は、円形である。　 The weight member 5 has an abutment surface 51 c that abuts against the diaphragm 7. The contact surface 51 c is connected to the diaphragm 7. In the present embodiment, the outer edge shape of the contact surface 51c is a circle. *
本実施形態に係る錘部材５は、ｚ軸方向に延びる円柱状に形成されているが、錘部材５は錘として機能すればよく、その形状及びサイズなどは制限されない。　 The weight member 5 according to the present embodiment is formed in a columnar shape extending in the z-axis direction, but the weight member 5 only needs to function as a weight, and the shape and size thereof are not limited. *
（流路アセンブリ３００）　流路アセンブリ３００は、アッパープレート６、ダイヤフラム７、圧力室プレート８、及びシール９を有する。　 (Flow path assembly 300) The flow path assembly 300 includes an upper plate 6, a diaphragm 7, a pressure chamber plate 8, and a seal 9. *
［アッパープレート６］　アッパープレート６は、ダイヤフラム７上に配置される。アッパープレート６は、ダイヤフラム側表面６Ｓにおいてダイヤフラム７と接触する。本実施形態に係るダイヤフラム側表面６Ｓは、平面である。　 [Upper plate 6] The upper plate 6 is disposed on the diaphragm 7. The upper plate 6 contacts the diaphragm 7 on the diaphragm side surface 6S. The diaphragm side surface 6S according to the present embodiment is a flat surface. *
アッパープレート６は、貫通孔６ｃ、給液路６ｄ、排液路６ｅ、及びダイヤフラム側表面６Ｓを有する。　 The upper plate 6 has a through hole 6c, a liquid supply path 6d, a drainage path 6e, and a diaphragm side surface 6S. *
給液路６ｄは、バレル継手６１を介して貯留タンク（不図示）から供給される液剤を、後述する圧力室プレート８の流入路８１に導く。給液路６ｄの入口には、貯留タンクから延びる給液管（不図示）を接続するためのバレル継手６１が取り付けられる。排液路６ｅは、後述する圧力室プレート８の流出路８４から排出される液剤を外部に導く。排液路６ｅの出口には、外部に延びる排液管（不図示）を接続するための排液継手６２が取り付けられる。　 The liquid supply path 6d guides the liquid supplied from a storage tank (not shown) through the barrel joint 61 to an inflow path 81 of the pressure chamber plate 8 described later. A barrel joint 61 for connecting a liquid supply pipe (not shown) extending from the storage tank is attached to the inlet of the liquid supply path 6d. The drainage path 6e guides the liquid discharged from the outflow path 84 of the pressure chamber plate 8 described later to the outside. A drainage joint 62 for connecting a drainage pipe (not shown) extending to the outside is attached to the outlet of the drainage path 6e. *
［ダイヤフラム７］　ダイヤフラム７は、ｘ軸方向及びｙ軸方向に延びる板状に形成される。ｘ軸方向は、ｙ軸方向及びｚ軸方向に垂直な方向である。ｙ軸方向は、ｘ軸方向及びｚ軸方向に垂直な方向である。　 [Diaphragm 7] The diaphragm 7 is formed in a plate shape extending in the x-axis direction and the y-axis direction. The x-axis direction is a direction perpendicular to the y-axis direction and the z-axis direction. The y-axis direction is a direction perpendicular to the x-axis direction and the z-axis direction. *
ダイヤフラム７は、圧力室プレート８上に配置される。ダイヤフラム７は、アッパープレート６と圧力室プレート８との間に挟まれる。ダイヤフラム７は、アッパープレート側表面７Ｓにおいてアッパープレート６と接触する。ダイヤフラム７は、圧力室プレート側表面７Ｔにおいて圧力室プレート８と接触する。　 The diaphragm 7 is disposed on the pressure chamber plate 8. The diaphragm 7 is sandwiched between the upper plate 6 and the pressure chamber plate 8. The diaphragm 7 contacts the upper plate 6 on the upper plate side surface 7S. The diaphragm 7 contacts the pressure chamber plate 8 on the pressure chamber plate side surface 7T. *
図３は、ダイヤフラム７をアッパープレート側表面７Ｓから見た平面図である。ダイヤフラム７は、給液孔７ｅ、排液孔７ｆ、及び可撓領域７ｇを有する。　 FIG. 3 is a plan view of the diaphragm 7 as viewed from the upper plate side surface 7S. The diaphragm 7 has a liquid supply hole 7e, a liquid discharge hole 7f, and a flexible region 7g. *
給液孔７ｅは、アッパープレート６の給液路６ｄと後述する圧力室プレート８の流入路８１とに連なる。排液孔７ｆは、アッパープレート６の排液路６ｅと後述する圧力室プレート８の流出路８４とに連なる。　 The liquid supply hole 7e is connected to a liquid supply path 6d of the upper plate 6 and an inflow path 81 of the pressure chamber plate 8 described later. The drain hole 7f is connected to a drain path 6e of the upper plate 6 and an outflow path 84 of the pressure chamber plate 8 described later. *
可撓領域７ｇは、ダイヤフラム７の一部分である。可撓領域７ｇは、ダイヤフラム７のうちアッパープレート６と圧力室プレート８とに接触しない領域である。可撓領域７ｇ上には、加圧用駆動部２が配置される。可撓領域７ｇには、錘部材５の当接面５１ｃが接続される。平面視における可撓領域７ｇの外縁形状は、錘部材５の当接面５１ｃと同じ円形である。　 The flexible region 7 g is a part of the diaphragm 7. The flexible region 7 g is a region that does not contact the upper plate 6 and the pressure chamber plate 8 in the diaphragm 7. The pressing drive unit 2 is disposed on the flexible region 7g. The contact surface 51c of the weight member 5 is connected to the flexible region 7g. The outer edge shape of the flexible region 7 g in plan view is the same circle as the contact surface 51 c of the weight member 5. *
可撓領域７ｇは、後述する圧力室プレート８の圧力室８２を覆う。可撓領域７ｇには、中間部材４及び錘部材５を介して圧電素子３の変位が伝達され、これにより可撓領域７ｇは、ｚ軸方向において弾性的に振動する。このように、ダイヤフラム７のうち振動膜として機能するのは、実質的に可撓領域７ｇのみである。　 The flexible region 7g covers a pressure chamber 82 of the pressure chamber plate 8 described later. Displacement of the piezoelectric element 3 is transmitted to the flexible region 7g via the intermediate member 4 and the weight member 5, whereby the flexible region 7g elastically vibrates in the z-axis direction. Thus, only the flexible region 7g substantially functions as the vibration film of the diaphragm 7. *
［圧力室プレート８］　圧力室プレート８は、ｘ軸方向及びｙ軸方向に延びる板状に形成される。圧力室プレート８上には、ダイヤフラム７が配置される。圧力室プレート８は、ダイヤフラム７と平行に配置される。圧力室プレート８は、接触面８Ｓにおいてダイヤフラム７と接触する。本実施形態において、圧力室プレート８のサイズは、ダイヤフラム７のサイズと同等である。　 [Pressure Chamber Plate 8] The pressure chamber plate 8 is formed in a plate shape extending in the x-axis direction and the y-axis direction. A diaphragm 7 is arranged on the pressure chamber plate 8. The pressure chamber plate 8 is arranged in parallel with the diaphragm 7. The pressure chamber plate 8 contacts the diaphragm 7 at the contact surface 8S. In the present embodiment, the size of the pressure chamber plate 8 is equivalent to the size of the diaphragm 7. *
図５は、圧力室プレート８を接触面８Ｓから見た平面図である。図６は、圧力室プレート８を接触面８Ｓから見た斜視図である。図７は、図５のＡ－Ａ線において、ダイヤフラム７、圧力室プレート８、及びシール９を切断した断面図である。図７は、接触面８Ｓに垂直な断面である。　 FIG. 5 is a plan view of the pressure chamber plate 8 as viewed from the contact surface 8S. FIG. 6 is a perspective view of the pressure chamber plate 8 as seen from the contact surface 8S. 7 is a cross-sectional view of the diaphragm 7, the pressure chamber plate 8, and the seal 9 taken along the line AA in FIG. FIG. 7 is a cross section perpendicular to the contact surface 8S. *
圧力室プレート８は、流入路８１、圧力室８２、ノズル８３、流出路８４、及びシール溝８５を有する。　 The pressure chamber plate 8 has an inflow path 81, a pressure chamber 82, a nozzle 83, an outflow path 84, and a seal groove 85. *
流入路８１は、接触面８Ｓに形成
された第１凹部Ｃ１によって構成される。流入路８１は、第１凹部Ｃ１がダイヤフラム７で塞がれることによって形成される。流入路８１は、接触面８Ｓに沿って延びる。本実施形態に係る流入路８１は、ｘ軸方向と平行に延びる。このように、圧力室プレート８の内部に貫通孔を形成するのではなく、圧力室プレート８の表面に形成された凹部をダイヤフラム７で塞ぐことによって流入路８１が形成される。そのため、圧力室プレート８を薄型化できるため、液剤塗布装置１００の小型化を実現することができる。　 The inflow channel 81 is configured by a first recess C1 formed in the contact surface 8S. The inflow path 81 is formed by the first recess C <b> 1 being blocked by the diaphragm 7. The inflow path 81 extends along the contact surface 8S. The inflow channel 81 according to the present embodiment extends in parallel with the x-axis direction. In this way, instead of forming a through hole in the pressure chamber plate 8, the inflow passage 81 is formed by closing the recess formed in the surface of the pressure chamber plate 8 with the diaphragm 7. Therefore, since the pressure chamber plate 8 can be thinned, the liquid agent coating apparatus 100 can be downsized.
流入路８１は、図７に示すように、矩形断面を有する。接触面８Ｓに平行なｙ軸方面（面方向の一例）における流入路８１の幅Ｗ１は、接触面８Ｓに垂直なｚ軸方向（厚み方向の一例）における流入路８１の高さＨ１より大きい。すなわち、流入路８１の幅Ｗ１に対する高さＨ１の比は、１より小さい。従って、流入路８１を扁平に形成することによって、圧力室プレート８を更に薄型化できるため、圧力室８２の体積を小さくすることによって、ダイヤフラム７の振動量に対応する圧力室８２の体積変化率を大きくすることができる。その結果、ダイヤフラム７の加圧力が小さくても圧力室８２内の液剤に対して大きな加圧ができ、加圧力を効率的に伝達できるため、より高粘度の液剤を、より低消費電力でノズル８３から吐出させることができる。　 As shown in FIG. 7, the inflow channel 81 has a rectangular cross section. The width W1 of the inflow channel 81 in the y-axis direction (an example of the surface direction) parallel to the contact surface 8S is larger than the height H1 of the inflow channel 81 in the z-axis direction (an example of the thickness direction) perpendicular to the contact surface 8S. That is, the ratio of the height H1 to the width W1 of the inflow channel 81 is smaller than 1. Therefore, since the pressure chamber plate 8 can be made thinner by forming the inflow passage 81 flat, the volume change rate of the pressure chamber 82 corresponding to the vibration amount of the diaphragm 7 can be reduced by reducing the volume of the pressure chamber 82. Can be increased. As a result, even if the applied pressure of the diaphragm 7 is small, a large pressurization can be applied to the liquid in the pressure chamber 82 and the applied pressure can be efficiently transmitted. 83 can be discharged. *
流入路８１の一端部は、ダイヤフラム７の給液孔７ｅに連なる。ダイヤフラム７の給液孔７ｅとアッパープレート６の給液路６ｄとを介して、流入路８１に液剤が供給される。流入路８１の他端部は、圧力室８２に連なる。流入路８１に供給された液剤は、圧力室８２に流入する。流入路８１の詳細な構成については後述する。　 One end of the inflow path 81 is connected to the liquid supply hole 7 e of the diaphragm 7. The liquid agent is supplied to the inflow path 81 through the liquid supply hole 7 e of the diaphragm 7 and the liquid supply path 6 d of the upper plate 6. The other end of the inflow passage 81 is connected to the pressure chamber 82. The liquid agent supplied to the inflow path 81 flows into the pressure chamber 82. The detailed configuration of the inflow channel 81 will be described later. *
圧力室８２は、接触面８Ｓに形成された第２凹部Ｃ２によって構成される。圧力室８２は、第２凹部Ｃ２がダイヤフラム７で塞がれることによって形成される。従って、圧力室プレート８を薄型化できるため、圧力室８２の体積を小さくすることによって、ダイヤフラム７の振動量に対応する圧力室８２の体積変化率を大きくすることができる。第２凹部Ｃ２（すなわち、圧力室８２）の外縁形状は、錘部材５の当接面５１ｃ及びダイヤフラム７の可撓領域７ｇと同様、円形である。ダイヤフラム７における可撓領域７ｇの範囲は、第２凹部Ｃ２の外縁によって規定される。　 The pressure chamber 82 is configured by a second recess C2 formed in the contact surface 8S. The pressure chamber 82 is formed by closing the second recess C <b> 2 with the diaphragm 7. Accordingly, since the pressure chamber plate 8 can be made thin, the volume change rate of the pressure chamber 82 corresponding to the vibration amount of the diaphragm 7 can be increased by reducing the volume of the pressure chamber 82. The outer edge shape of the second recess C <b> 2 (that is, the pressure chamber 82) is circular like the contact surface 51 c of the weight member 5 and the flexible region 7 g of the diaphragm 7. The range of the flexible region 7g in the diaphragm 7 is defined by the outer edge of the second recess C2. *
圧力室８２は、流入路８１から流入する液剤を貯留する。圧力室８２に貯留された液剤は、ノズル８３から吐出される。また、圧力室８２に貯留された液剤は、圧力室８２に混入した気泡を除去するために、流出路８４から排出される場合がある。圧力室８２の詳細な構成については後述する。　 The pressure chamber 82 stores the liquid agent flowing in from the inflow passage 81. The liquid agent stored in the pressure chamber 82 is discharged from the nozzle 83. Further, the liquid agent stored in the pressure chamber 82 may be discharged from the outflow path 84 in order to remove bubbles mixed in the pressure chamber 82. The detailed configuration of the pressure chamber 82 will be described later. *
ノズル８３は、圧力室８２に連なる。ノズル８３は、圧力室プレート８を貫通する孔である。ノズル８３は、圧力室プレート８の外面８Ｔに開口する。ノズル８３は、ｚ軸方向においてダイヤフラム７と対向する。ノズル８３は、接触面８Ｓの平面視において、圧力室８２の内側に配置される。ノズル８３は、接触面８Ｓの平面視において、圧力室８２の中央に配置される。ノズル８３の外縁形状は、圧力室８２と同様、円形である。圧力室８２に貯留された液剤は、ノズル８３から外部に吐出される。ノズル８３の詳細な構成については後述する。　 The nozzle 83 continues to the pressure chamber 82. The nozzle 83 is a hole that penetrates the pressure chamber plate 8. The nozzle 83 opens on the outer surface 8T of the pressure chamber plate 8. The nozzle 83 faces the diaphragm 7 in the z-axis direction. The nozzle 83 is disposed inside the pressure chamber 82 in the plan view of the contact surface 8S. The nozzle 83 is disposed at the center of the pressure chamber 82 in a plan view of the contact surface 8S. The outer edge shape of the nozzle 83 is circular like the pressure chamber 82. The liquid agent stored in the pressure chamber 82 is discharged from the nozzle 83 to the outside. The detailed configuration of the nozzle 83 will be described later. *
流出路８４は、接触面８Ｓに形成された第３凹部Ｃ３によって構成される。流出路８４は、第３凹部Ｃ３がダイヤフラム７で塞がれることによって形成される。従って、圧力室プレート８を薄型化できるため、圧力室８２の体積を小さくすることによって、ダイヤフラム７の振動量に対応する圧力室８２の体積変化率を大きくすることができる。流出路８４は、接触面８Ｓに沿って延びる。本実施形態に係る流出路８４は、ｘ軸方向と平行に延びる。流出路８４の一端部は、圧力室８２に連なる。流入路８１の他端部は、ダイヤフラム７の排液孔７ｆに連なる。圧力室８２に混入した気泡を除去する場合、ダイヤフラム７の排液孔７ｆとアッパープレート６の排液路６ｅとを介して、流出路８４から外部に液剤が排出される。　 The outflow path 84 is configured by a third recess C3 formed in the contact surface 8S. The outflow path 84 is formed by the third recess C <b> 3 being closed with the diaphragm 7. Accordingly, since the pressure chamber plate 8 can be made thin, the volume change rate of the pressure chamber 82 corresponding to the vibration amount of the diaphragm 7 can be increased by reducing the volume of the pressure chamber 82. The outflow path 84 extends along the contact surface 8S. The outflow channel 84 according to the present embodiment extends in parallel with the x-axis direction. One end of the outflow passage 84 is connected to the pressure chamber 82. The other end of the inflow passage 81 is connected to the drain hole 7 f of the diaphragm 7. When the bubbles mixed in the pressure chamber 82 are removed, the liquid agent is discharged from the outflow path 84 to the outside through the drain hole 7f of the diaphragm 7 and the drain path 6e of the upper plate 6. *
シール溝８５は、接触面８Ｓに形成される。シール溝８５は、接触面８Ｓの平面視において、第１乃至第３凹部Ｃ１～Ｃ３の周囲に設けられる。シール溝８５は、第１乃至第３凹部Ｃ１～Ｃ３の外縁に沿って設けられる。シール溝８５は、第１乃至第３凹部Ｃ１～Ｃ３の全体を取り囲む。シール溝８５は、環状に形成される。　 The seal groove 85 is formed on the contact surface 8S. The seal groove 85 is provided around the first to third recesses C1 to C3 in the plan view of the contact surface 8S. The seal groove 85 is provided along the outer edge of the first to third recesses C1 to C3. The seal groove 85 surrounds the entire first to third recesses C1 to C3. The seal groove 85 is formed in an annular shape. *
［シール９］　シール９は、図７に示すように、ダイヤフラム７と圧力室プレート８との間に挟まれる。シール９は、圧力室プレート８のシール溝８５に配置される。シール９は、圧力室プレート８の流入路８１、圧力室８２、及び流出路８４を取り囲む。シール９は、シール溝８５に配置された状態でダイヤフラム７に押しつけられる。これによって、流入路８１、圧力室８２、及び流出路８４の液密性及び気密性が確保される。シール９は、例えばゴムなどの弾性部材によって構成することができる。　 [Seal 9] The seal 9 is sandwiched between the diaphragm 7 and the pressure chamber plate 8, as shown in FIG. The seal 9 is disposed in the seal groove 85 of the pressure chamber plate 8. The seal 9 surrounds the inflow path 81, the pressure chamber 82, and the outflow path 84 of the pressure chamber plate 8. The seal 9 is pressed against the diaphragm 7 while being disposed in the seal groove 85. Thereby, the liquid tightness and air tightness of the inflow path 81, the pressure chamber 82, and the outflow path 84 are ensured. The seal 9 can be made of an elastic member such as rubber. *
（流入路８１及びノズル８３の流路抵抗）　本実施形態において、流入路８１における流路抵抗に対するノズル８３における流路抵抗の比は、１以上である。すなわち、ノズル８３における流路抵抗は、流入路８１における流路抵抗と同じ、又は、流入路８１における流路抵抗より大きい。そのため、ノズル８３から液剤が連続的に吐出される場合に、流入路８１から圧力室８２に液剤をスムーズに補充することができる。　 (Flow path resistance of the inflow path 81 and the nozzle 83) In this embodiment, the ratio of the flow path resistance in the nozzle 83 to the flow path resistance in the inflow path 81 is 1 or more. That is, the flow path resistance in the nozzle 83 is the same as the flow path resistance in the inflow path 81 or greater than the flow path resistance in the inflow path 81. Therefore, when the liquid agent is continuously discharged from the nozzle 83, the liquid agent can be smoothly replenished from the inflow path 81 to the pressure chamber 82. *
流入路８１における流路抵抗に対するノズル８３における流路抵抗の比は、２以下であることが好ましい。すなわち、ノズル８３における流路抵抗は、流入路８１における流路抵抗の２倍以下が好ましい。これにより、加圧用駆動部２からダイヤフラム７（具体的には、可撓領域７ｇ）に加圧振動が加えられて、圧力室８２の体積が小さくなったときに、圧力室８２から流入路８１に液剤が逆流することを抑制できる。その結果、ダイヤフラム７の加圧振動に応じて、ノズル８３からスムーズに液剤を吐出させることができる。　 The ratio of the channel resistance in the nozzle 83 to the channel resistance in the inflow channel 81 is preferably 2 or less. That is, the flow path resistance in the nozzle 83 is preferably not more than twice the flow path resistance in the inflow path 81. As a result, when pressure vibration is applied from the pressurizing drive unit 2 to the diaphragm 7 (specifically, the flexible region 7g) and the volume of the pressure chamber 82 is reduced, the inflow path 81 from the pressure chamber 82 is obtained. The liquid can be prevented from flowing backward. As a result, the liquid agent can be smoothly discharged from the nozzle 83 in accordance with the pressure vibration of the diaphragm 7. *
流入路８１における流路抵抗は、流入路８１の全長にわたって断面解析することによって算出される。同様に、ノズル８３における流路抵抗は、ノズル８３の全長にわたって断面解析することによって算出される。この断面解析では、圧力損失の算出に用いられる下記の一般式（１）から流路抵抗を算出することができる。　 The flow path resistance in the inflow path 81 is calculated by performing a cross-sectional analysis over the entire length of the inflow path 81. Similarly, the flow path resistance in the nozzle 83 is calculated by performing a cross-sectional analysis over the entire length of the nozzle 83. In this cross-sectional analysis, the channel resistance can be calculated from the following general formula (1) used for calculating the pressure loss. *
ｐ１－ｐ２＝Ｕ×（８×μ×Ｌ）／（π×ｒ４）　　・・・（１）　なお、式（１）において、ｐ１－ｐ２は圧力損失であり、ｐ１は流入側の圧力（単位：Ｐａ）であり、ｐ２は流出側の圧力（単位：Ｐａ）である。また、式（１）において、μは粘性係数（単位：Ｎ・ｓｅｃ／ｍ２）であり、Ｌは流路長（単位：ｍ）であり、ｒは流路半径（単位：ｍ）であり、Ｕは流量（単位：ｍ３／ｓｅｃ）である。　 p1−p2 = U × (8 × μ × L) / (π × r4) (1) In equation (1), p1−p2 is a pressure loss, and p1 is a pressure (unit) on the inflow side. : Pa), and p2 is the pressure on the outflow side (unit: Pa). In Expression (1), μ is a viscosity coefficient (unit: N · sec / m 2 ), L is a channel length (unit: m), and r is a channel radius (unit: m). , U is a flow rate (unit: m 3 / sec).
（圧力室８２及びノズル８３の形状）　図８は、図５のＢ－Ｂ線において液剤塗布装置１００を切断した断面図である。図８は、圧力室プレート８の接触面８Ｓに垂直な断面である。　 (Shape of Pressure Chamber 82 and Nozzle 83) FIG. 8 is a cross-sectional view of the liquid application device 100 taken along line BB in FIG. FIG. 8 is a cross section perpendicular to the contact surface 8 </ b> S of the pressure chamber plate 8. *
圧力室８２（第２凹部Ｃ２）は、ノズル８３に向かって全体的にテーパ状に形成される。圧力室８２は、ノズル８３に向かって先細り形状を有する。そのため、接触面８Ｓに平行なｘ軸方向（面方向の一例）における圧力室８２の幅Ｗ２は、ダイヤフラム７からノズル８３に近づくほど狭くなっている。　 The pressure chamber 82 (second recess C <b> 2) is formed in an overall tapered shape toward the nozzle 83. The pressure chamber 82 has a tapered shape toward the nozzle 83. Therefore, the width W <b> 2 of the pressure chamber 82 in the x-axis direction (an example of the surface direction) parallel to the contact surface 8 </ b> S becomes narrower as it approaches the nozzle 83 from the diaphragm 7. *
これにより、圧力室８２の体積を小さくできるため、ダイヤフラム７（具体的には、可撓領域７ｇ）の振動量に対応する圧力室８２の体積変化率を大きくすることができる。その結果、ダイヤフラム７が小さくても圧力室８２内の液剤に対して大きな加圧ができ、加圧力を効率的に伝達できるため、より高粘度の液剤を、より低消費電力でノズル８３から吐出させることができる。特に、本実施形態では、流入路８１を第１凹部Ｃ１で構成することによって圧力室プレート８の薄型化が図られており、圧力室８２の体積をより小さくしやすいため、より効率的に加圧力を液剤に伝達することができる。また、圧力室８２を円柱状に形成する場合に比べて、ノズル８３周辺における圧力室プレート８の肉厚を厚くできるため、ノズル８３の全長を短くして流路抵抗を低減させたとしても、圧力室プレート８の剛性を確保することができる。　 Thereby, since the volume of the pressure chamber 82 can be reduced, the volume change rate of the pressure chamber 82 corresponding to the vibration amount of the diaphragm 7 (specifically, the flexible region 7g) can be increased. As a result, even if the diaphragm 7 is small, a large pressurization can be applied to the liquid in the pressure chamber 82, and the applied pressure can be transmitted efficiently. Can be made. In particular, in the present embodiment, the pressure chamber plate 8 is made thin by configuring the inflow passage 81 with the first recess C1, and the volume of the pressure chamber 82 can be easily reduced. The pressure can be transmitted to the liquid agent. Further, since the thickness of the pressure chamber plate 8 around the nozzle 83 can be increased as compared with the case where the pressure chamber 82 is formed in a columnar shape, even if the total length of the nozzle 83 is shortened to reduce the channel resistance, The rigidity of the pressure chamber plate 8 can be ensured. *
また、ｘ軸方向における圧力室８２の全幅Ｗ２ｍａｘは、ｚ軸方向（厚み方向の一例）における圧力室８２の全高Ｈ２ｍａｘよりも大きい。このように、圧力室８２を扁平に形成することによって、圧力室プレート８を薄型化できるため、液剤塗布装置１００の小型化を実現することができる。なお、圧力室８２の全高Ｈ２ｍａｘは、ｚ軸方向におけるダイヤフラム７とノズル８３との距離である。　 Further, the total width W2max of the pressure chamber 82 in the x-axis direction is larger than the total height H2max of the pressure chamber 82 in the z-axis direction (an example of the thickness direction). Thus, since the pressure chamber plate 8 can be thinned by forming the pressure chamber 82 flat, the liquid agent coating apparatus 100 can be downsized. The total height H2max of the pressure chamber 82 is the distance between the diaphragm 7 and the nozzle 83 in the z-axis direction. *
圧力室８２の全高Ｈ２ｍａｘに対する全幅Ｗ２ｍａｘの比は、１０以上であることが好ましい。すなわち、圧力室８２の全幅Ｗ２ｍａｘは、全高Ｈ２ｍａｘの１０倍以上であることが好ましい。これにより、ダイヤフラム７からの加圧力を液剤に対して更に効率的に伝達できるとともに、液剤塗布装置１００の更なる小型化を実現することができる。　 The ratio of the total width W2max to the total height H2max of the pressure chamber 82 is preferably 10 or more. That is, the total width W2max of the pressure chamber 82 is preferably 10 times or more the total height H2max. Thereby, while being able to transmit the applied pressure from the diaphragm 7 more efficiently with respect to a liquid agent, the further size reduction of the liquid agent application | coating apparatus 100 is realizable. *
本実施形態において、圧力室８２の断面は、円錐台形状である。詳細には、圧力室８２は、ダイヤフラム７の可撓領域７ｇを底面とする円錐のうち頂点部分が除かれた断面形状を有する。従って、圧力室８２の内側面８２Ｓは、円錐面のうち頂点部分が除かれた部分円錐面になっている。ただし、圧力室８２は、ノズル８３に向かってテーパ状に形成されていればよく、その断面は円錐台形状に限られない。　 In this embodiment, the cross section of the pressure chamber 82 has a truncated cone shape. Specifically, the pressure chamber 82 has a cross-sectional shape in which a vertex portion is removed from a cone whose bottom surface is the flexible region 7 g of the diaphragm 7. Accordingly, the inner side surface 82S of the pressure chamber 82 is a partial conical surface from which the apex portion of the conical surface is removed. However, the pressure chamber 82 only needs to be tapered toward the nozzle 83, and the cross section is not limited to the truncated cone shape. *
ノズル８３は、外面８Ｔに向かって全体的にテーパ状に形成される。ノズル８３は、外面８Ｔに向かって先細り形状を有する。そのため、接触面８Ｓに平行なｘ軸方向におけるノズル８３の幅Ｗ３は、圧力室８２から離れるほど狭くなっている。　 The nozzle 83 is formed in a taper shape as a whole toward the outer surface 8T. The nozzle 83 has a tapered shape toward the outer surface 8T. Therefore, the width W <b> 3 of the nozzle 83 in the x-axis direction parallel to the contact surface 8 </ b> S decreases as the distance from the pressure chamber 82 increases. *
本実施形態において、ノズル８３の断面は、円錐台形状である。詳細には、ノズル８３は、圧力室８２を底面とする円錐のうち頂点部分が除かれた断面形状を有する。従って、ノズル８３の内側面８３Ｓは、円錐面のうち頂点部分が除かれた部分円錐面になっている。ただし、ノズル８３は、外面８Ｔに向かってテーパ状に形成されていればよく、その断面は円錐台形状に限られない。　 In the present embodiment, the cross section of the nozzle 83 has a truncated cone shape. Specifically, the nozzle 83 has a cross-sectional shape in which a vertex portion is removed from a cone having the pressure chamber 82 as a bottom surface. Accordingly, the inner side surface 83S of the nozzle 83 is a partial conical surface from which the apex portion of the conical surface is removed. However, the nozzle 83 should just be formed in the taper shape toward the outer surface 8T, and the cross section is not restricted to a truncated cone shape. *
ここで、ノズル８３の内側面８３Ｓは、圧力室８２の内側面８２Ｓに比べて、接触面８Ｓに対する傾きが大きい。すなわち、ノズル８３の内側面８３Ｓは、圧力室８２の内側面８２Ｓよりも、ｘ－ｙ平面に対して大きく傾斜している。そのため、ノズル８３周辺における圧力室プレート８の肉厚を厚くできるため、ノズル８３周辺の剛性を確保することができる。　 Here, the inner surface 83S of the nozzle 83 has a larger inclination with respect to the contact surface 8S than the inner surface 82S of the pressure chamber 82. That is, the inner side surface 83S of the nozzle 83 is more inclined with respect to the xy plane than the inner side surface 82S of the pressure chamber 82. Therefore, since the thickness of the pressure chamber plate 8 around the nozzle 83 can be increased, the rigidity around the nozzle 83 can be ensured. *
また、図８に示すように、ノズル８３の中心軸８３Ａは、圧力室８２の中心軸８２Ａと一致する。従って、圧力室８２からノズル８３に加圧力を効率的に伝達させることができるため、ノズル８３からよりスムーズに液剤を吐出させることができる。　 Further, as shown in FIG. 8, the central axis 83 </ b> A of the nozzle 83 coincides with the central axis 82 </ b> A of the pressure chamber 82. Accordingly, the applied pressure can be efficiently transmitted from the pressure chamber 82 to the nozzle 83, so that the liquid agent can be discharged more smoothly from the nozzle 83. *
さらに、加圧用駆動部２の中心軸２Ａは、圧力室８２の中心軸８２Ａ及びノズル８３の中心軸８３Ａそれぞれと一致する。従って、加圧用駆動部２から圧力室８２に加圧力を効率的に伝達させることができるため、ノズル８３から更にスムーズに液剤を吐出させることができる。　 Further, the central axis 2A of the pressurizing drive unit 2 coincides with the central axis 82A of the pressure chamber 82 and the central axis 83A of the nozzle 83, respectively. Accordingly, the applied pressure can be efficiently transmitted from the pressurizing drive unit 2 to the pressure chamber 82, so that the liquid agent can be discharged more smoothly from the nozzle 83. *
（中間部材４の構成）　図９は、中間部材４の斜視図である。　 (Configuration of Intermediate Member 4) FIG. 9 is a perspective view of the intermediate member 4. FIG. *
中間部材４は、圧電素子３の先端に接続される。中間部材４は、圧電素子３に接続される平面４Ｓを有する。平面４Ｓは、平面状に形成される。　 The intermediate member 4 is connected to the tip of the piezoelectric element 3. The intermediate member 4 has a flat surface 4 </ b> S connected to the piezoelectric element 3. The plane 4S is formed in a planar shape. *
中間部材４は、平面４Ｓの反対側に設けられる曲面４Ｔを有する。曲面４Ｔは、錘部材５と点接触する（図８参照）。曲面４Ｔは、球面の一部分であってもよいし、湾曲面であってもよい。曲面４Ｔを錘部材５と点接触させることによって、圧電素子３の耐久性を向上させることができる。　 The intermediate member 4 has a curved surface 4T provided on the opposite side of the flat surface 4S. The curved surface 4T makes point contact with the weight member 5 (see FIG. 8). The curved surface 4T may be a part of a spherical surface or a curved surface. By bringing the curved surface 4T into point contact with the weight member 5, the durability of the piezoelectric element 3 can be improved. *
なお、本実施形態に係る中間部材４は半球状に形成されているが、平面４Ｓと曲面４Ｔとを有していればよく、その形状及びサイズは特に制限されな
い。　 In addition, although the intermediate member 4 which concerns on this embodiment is formed in hemispherical shape, it should just have the plane 4S and the curved surface 4T, and the shape and size are not restrict | limited in particular.
中間部材４は、錘部材５よりも硬度の大きい材料によって構成されることが好ましい。また、中間部材４は、錘部材５よりも耐摩耗性の高い材料によって構成されることが好ましい。このような材料としては、例えば、マルテンサイト系ステンレス鋼（例えば、ＳＵＳ４４０など）、セラミックス系材料（例えば、アルミナなど）、及びルビーなどが挙げられる。これによって、圧電素子３と通常接着剤で接続される中間部材４が磨耗又は変形して圧電素子３とともに中間部材４を交換する回数を減らすことができるため、メンテナンス時間とメンテナンスコストを抑えることができる。　 The intermediate member 4 is preferably made of a material having a hardness higher than that of the weight member 5. The intermediate member 4 is preferably made of a material having higher wear resistance than the weight member 5. Examples of such a material include martensitic stainless steel (for example, SUS440), ceramic material (for example, alumina), and ruby. This can reduce the number of times that the intermediate member 4 that is normally connected to the piezoelectric element 3 with an adhesive is worn or deformed and replaces the intermediate member 4 together with the piezoelectric element 3, thereby reducing maintenance time and maintenance cost. it can. *
（特徴）　本実施形態に係る加圧用駆動部２は、ダイヤフラム７上に配置される錘部材５と、錘部材５上に配置される中間部材４と、中間部材４上に配置される圧電素子３とを有する。中間部材４は、錘部材５と点接触し、圧電素子３と面接触する。従って、中間部材４を介することによって、錘部材５から圧電素子３に加わる力を均等に伝達させることができる。その結果、圧電素子３の内部に偏った圧縮応力が発生することを抑制できるため、圧電素子３の破損を防止し、かつ耐久性を向上させることができる。また、圧電素子３とダイヤフラム７に配置されている錘部材５は点接触なので、ダイヤフラム７に対する圧電素子３の組み付け位置、特に組み付け角度の許容誤差を緩和することができるため、設計公差の緩和による製作部品を低コスト化、ならびに組立工程の簡素化を図ることが出来る。　 (Feature) The pressurizing drive unit 2 according to the present embodiment includes a weight member 5 disposed on the diaphragm 7, an intermediate member 4 disposed on the weight member 5, and a piezoelectric element disposed on the intermediate member 4. 3. The intermediate member 4 is in point contact with the weight member 5 and in surface contact with the piezoelectric element 3. Therefore, the force applied from the weight member 5 to the piezoelectric element 3 can be transmitted evenly through the intermediate member 4. As a result, it is possible to suppress the occurrence of biased compressive stress inside the piezoelectric element 3, thereby preventing the piezoelectric element 3 from being damaged and improving the durability. Further, since the weight member 5 disposed on the piezoelectric element 3 and the diaphragm 7 is a point contact, the assembly position of the piezoelectric element 3 with respect to the diaphragm 7, particularly the tolerance of the assembly angle can be relaxed. The cost of manufactured parts can be reduced and the assembly process can be simplified. *
（実施形態の変形例）　本発明は上記の実施形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなる。　 (Modifications of Embodiments) Although the present invention has been described according to the above-described embodiments, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art. *
［変形例１］　上記実施形態に係る圧力室プレート８において、流入路８１、圧力室８２、及び流出路８４は、接触面８Ｓに形成されることとしたが、それぞれ圧力室プレート８の内部に形成されていてもよい。この場合、液剤塗布装置１００は、シール９を備えていなくてもよい。　 [Modification 1] In the pressure chamber plate 8 according to the above embodiment, the inflow path 81, the pressure chamber 82, and the outflow path 84 are formed on the contact surface 8S. It may be formed. In this case, the liquid agent application device 100 may not include the seal 9. *
［変形例２］　上記実施形態に係る圧力室プレート８は、流出路８４を有することとしたが、流出路８４を有していなくてもよい。　 [Modification 2] Although the pressure chamber plate 8 according to the above embodiment has the outflow path 84, the outflow path 84 may not be included. *
［変形例３］　上記実施形態に係る圧力室８２の幅Ｗ２は、ノズル８３に近づくほど狭いこととしたが、これに限られない。　 [Modification 3] Although the width W <b> 2 of the pressure chamber 82 according to the above embodiment is narrower as it approaches the nozzle 83, it is not limited thereto. *
［変形例４］　上記実施形態に係るノズル８３の幅Ｗ３は、圧力室８２から離れるほど狭いこととしたが、これに限られない。　 [Modification 4] The width W3 of the nozzle 83 according to the above embodiment is narrower as it is farther from the pressure chamber 82, but is not limited thereto. *
［変形例５］　上記実施形態に係るダイヤフラム７のサイズは、圧力室プレート８のサイズと同等であることとしたが、ダイヤフラム７は、流入路８１、圧力室８２、及び流出路８４を覆うことのできるサイズであればよい。　 [Modification 5] Although the size of the diaphragm 7 according to the above embodiment is equivalent to the size of the pressure chamber plate 8, the diaphragm 7 covers the inflow path 81, the pressure chamber 82, and the outflow path 84. Any size can be used. *
［変形例６］　上記実施形態では、第１及び第２柱部１１，１２をアッパープレート６に接続することによって、ベースプレート１を流路アセンブリ３００に対して位置決めすることとしたが、ベースプレート１の位置決め方法は適宜変更可能である。　 [Modification 6] In the above embodiment, the base plate 1 is positioned with respect to the flow path assembly 300 by connecting the first and second pillar portions 11 and 12 to the upper plate 6. The positioning method can be changed as appropriate. *
［変形例７］　上記実施形態において、ダイヤフラム７、圧力室プレート８、及びアッパープレート６は、互いに接続されることとしたが、例えば、ねじによって互いに連結されてもよい。　 [Modification 7] In the above embodiment, the diaphragm 7, the pressure chamber plate 8, and the upper plate 6 are connected to each other, but may be connected to each other by screws, for example. *
［変形例８］　上記実施形態において、加圧用駆動部２は、圧電素子３、中間部材４、及び錘部材５を有することとしたが、錘部材５を有していなくてもよい。この場合、中間部材４はダイヤフラム７と直接的に点接触するので、ダイヤフラム７が「点接触対象物」となる。　 [Modification 8] In the above-described embodiment, the pressing drive unit 2 includes the piezoelectric element 3, the intermediate member 4, and the weight member 5, but may not include the weight member 5. In this case, since the intermediate member 4 directly makes point contact with the diaphragm 7, the diaphragm 7 becomes a “point contact object”. *
［変形例９］　上記実施形態では特に触れていないが、流路アセンブリ３００のうち液剤と接触する部材（アッパープレート６、ダイヤフラム７、及び圧力室プレート８）は、液剤に対する耐食性を有する材料によって構成することが好ましい。ただし、これらの部材のうち液剤と接触する面を耐食性膜などで被覆すれば、種々の構成材料を採用することができる。  [Modification 9] Although not particularly mentioned in the above embodiment, the members (upper plate 6, diaphragm 7, and pressure chamber plate 8) in contact with the liquid agent in the flow path assembly 300 are made of a material having corrosion resistance to the liquid agent. It is preferable to do. However, various constituent materials can be employed as long as the surface in contact with the liquid agent is covered with a corrosion-resistant film.

Claims (9)

  1. 液剤を貯留する圧力室を有する圧力室プレートと、　前記圧力室プレート上に配置されるダイヤフラムと、　前記ダイヤフラムに加圧振動を加える加圧用駆動部と、を備え、　前記加圧用駆動部は、　圧電素子と、　前記圧電素子と面接触し、かつ、前記圧電素子の反対側に位置する点接触対象物と点接触する中間部材と、を有する、液剤塗布装置。 A pressure chamber plate having a pressure chamber for storing a liquid agent; a diaphragm disposed on the pressure chamber plate; and a pressurizing drive unit that applies pressurizing vibration to the diaphragm, wherein the pressurizing drive unit is piezoelectric A liquid application device comprising: an element; and an intermediate member that is in surface contact with the piezoelectric element and is in point contact with a point contact object located on the opposite side of the piezoelectric element.
  2. 前記点接触対象物は、前記ダイヤフラムと前記中間部材との間に配置された受け部材である、請求項１に記載の液剤塗布装置。 The liquid agent application device according to claim 1, wherein the point contact object is a receiving member disposed between the diaphragm and the intermediate member.
  3. 前記点接触対象物は、前記ダイヤフラムである、請求項１に記載の液剤塗布装置。 The liquid agent coating apparatus according to claim 1, wherein the point contact object is the diaphragm.
  4. 前記中間部材は、前記点接触対象物よりも硬度の大きい材料によって構成される、請求項１に記載の液剤塗布装置。 The liquid agent coating apparatus according to claim 1, wherein the intermediate member is made of a material having a hardness higher than that of the point contact object.
  5. 前記中間部材は、前記点接触対象物よりも耐摩耗性の高い材料によって構成される、請求項１に記載の液剤塗布装置。 The liquid agent coating apparatus according to claim 1, wherein the intermediate member is made of a material having higher wear resistance than the point contact object.
  6. 前記圧力室プレートは、前記ダイヤフラムに接触する接触面を有し、　前記圧力室は、前記接触面に形成された凹部によって構成される、請求項１に記載の液剤塗布装置。 2. The liquid application device according to claim 1, wherein the pressure chamber plate has a contact surface in contact with the diaphragm, and the pressure chamber is configured by a recess formed in the contact surface.
  7. 前記点接触対象物は、前記ダイヤフラムと前記中間部材との間に配置された受け部材であり、　前記受け部材は、前記ダイヤフラムに当接する当接面を有し、　前記当接面の外縁形状は、前記接触面における前記凹部の外縁形状と同じである、請求項４に記載の液剤塗布装置。 The point contact object is a receiving member disposed between the diaphragm and the intermediate member, and the receiving member has a contact surface that comes into contact with the diaphragm, and an outer edge shape of the contact surface is The liquid application device according to claim 4, wherein the liquid application device has the same outer edge shape of the concave portion on the contact surface.
  8. 前記中間部材は、前記点接触対象物と点接触する曲面を有する、請求項１に記載の液剤塗布装置。 The liquid agent coating apparatus according to claim 1, wherein the intermediate member has a curved surface that makes point contact with the point contact object.
  9. 前記中間部材は、前記圧電素子に接続され、かつ、前記点接触対象物と離接可能である、請求項１に記載の液剤塗布装置。 The liquid agent coating apparatus according to claim 1, wherein the intermediate member is connected to the piezoelectric element and is detachable from the point contact object.
PCT/JP2019/021334 2018-06-01 2019-05-29 Liquid agent applying device WO2019230816A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002143746A (en) * 2000-11-08 2002-05-21 Matsushita Electric Ind Co Ltd Device and method for supplying fluid
JP2008105252A (en) * 2006-10-25 2008-05-08 Toshiba Corp Nozzle plate, method for manufacturing nozzle plate, liquid droplet jet head, method for manufacturing liquid droplet jet head, and liquid droplet jet device
WO2018180006A1 (en) * 2017-03-27 2018-10-04 日本電産株式会社 Droplet discharge device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002143746A (en) * 2000-11-08 2002-05-21 Matsushita Electric Ind Co Ltd Device and method for supplying fluid
JP2008105252A (en) * 2006-10-25 2008-05-08 Toshiba Corp Nozzle plate, method for manufacturing nozzle plate, liquid droplet jet head, method for manufacturing liquid droplet jet head, and liquid droplet jet device
WO2018180006A1 (en) * 2017-03-27 2018-10-04 日本電産株式会社 Droplet discharge device

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