KR20190085201A - The magnetostrictive inkjet head for hydraulic amplified displacement - Google Patents

Abstract

According to the present invention, a magnetostrictive inkjet head for hydraulic amplified displacement comprises: a housing; a magnetic field generation unit; a magnetostrictive member; a push rod; a pre-load spring; a chamber; a fluid supply nozzle; a needle; and a displacement amplifying means. Therefore, a fluid stored in a fluid storage tank is sucked into the inside of a chamber through the fluid supply nozzle.

Description

[0001] The present invention relates to a hydraulic displacement amplifying type magnetostrictive inkjet head,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic displacement amplification type magnetostrictive inkjet head capable of automatically performing a printing operation by jetting a fluid filled in an inkjet head onto a substrate material using a magnetostrictive member whose length is changed according to computer control, And a hydraulic displacement amplification type magnetostrictive inkjet head capable of ejecting a fluid having a high viscosity such as an adhesive by inserting a structure capable of amplifying the displacement of the magnetostrictive member 10 times or more in the inkjet head.

BACKGROUND ART In general, a printing technique using an ink jet is a technique for jetting a droplet having a diameter of several tens or several hundreds (um) to a desired position on a member to be injected, .

Since such inkjet printing technology can use paper, fabric, metal, ceramics, polymer and the like as a material to be injected with fluid, it is possible to use not only display manufacturing process such as LCD and OLED but also PCB manufacturing process, DNA microarray It has an advantage that its application range is wide to biotechnology.

As a method for discharging the fluid contained in the ink jet head to the outside of the nozzle provided in the ink jet head, a thermal method, an electrostatic method, or the like is generally used.

In the heat transfer method, a fluid filled in the ink-jet head is heated by a heater to generate bubbles in the fluid, thereby discharging the fluid filled in the ink-jet head to the outside of the nozzle. The electrostatic force system applies a high voltage to the fluid and the ink- And a force is generated on the member to be injected, thereby engraving a desired shape on the member to be injected.

However, the heat transfer method and the electrostatic force method have a problem in that the fluid can be denatured by applying heat or high voltage to the fluid, which limits the usable fluid.

In order to solve the above problem, there is a piezo system which can press the chamber and push the fluid stored in the chamber to the outside of the nozzle. In the piezo system, the piezo element, which increases or decreases in length according to an external electric signal, And the fluid filled in the chamber is pushed out of the nozzle by abutting one end of the chamber with the chamber.

However, the piezo element can not exert various forces due to the characteristics of the device, and thus there is a limit in discharging liquid droplets of various sizes outside the nozzle.

On the other hand, the prior art of the present invention has been filed and published as "Inkjet Device" in Patent Publication No. "10-2004-0020902 ", which inkjet printhead is designed to eject and print one or more droplets of material from the nozzles of the inkjet printhead Means for supplying an arrayed drive signal to the inkjet printhead; A transfer stage for providing relative movement between the substrate to be printed with the material and the inkjet printhead; A monitoring unit for monitoring a position of the transfer stage; And control means for controlling supply of the drive signal in accordance with a monitoring position of the transfer stage.

As another prior art, a magnetostrictive inkjet head of Patent Publication No. 10-2012-0041040 has been filed and disclosed. The magnetostrictive inkjet head has a magnetostrictive inkjet head, And an apparatus constituting the ink jet head using the principle that the length of the deformable member is increased and a control means.

This technique can solve the limit (tens cP) of the piezoelectric element type ink jet head to a certain extent, with a dischargeable fluid viscosity of about 1000 cP, but it has a limitation in discharging a fluid having a high viscosity such as an adhesive of 1000 cP or more.

Korean Patent Publication No. 10-2004-0020902 (Mar. 3, 2004) Korea Patent Registration No. 10-1634419 (June 26, 2016) Korean Patent Publication No. 10-2012-0041040 (2012.04.30)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hydraulic displacement amplification type magnetostrictive inkjet head capable of increasing a discharge pressure of an inkjet head and discharging a high viscosity fluid such as an adhesive to an inkjet head.

According to an aspect of the present invention, there is provided a hydraulic displacement amplification type magnetostrictive inkjet head including: a housing having a space therein; A magnetic field generator mounted in the space and generating a magnetic field having a direction and an intensity different from each other according to an input current amount or a current direction; A magnetostrictive member sandwiched in the magnetic field generating portion and having a length varying in accordance with an intensity and a direction of a magnetic field generated from the magnetic field generating portion; And an expansion plate disposed on the lower portion of the magnetostrictive member in the space and having an upper surface thereof abutted against the bottom surface of the magnetostrictive member to be pushed down by the magnetostrictive member when the length of the magnetostrictive member increases, Push rod; Shaped spring, the push rod is penetrated, the lower end thereof is supported over a retaining jaw formed on the inner wall of the space part, the upper end abuts against the bottom surface of the extension plate of the push rod, the push rod is pushed up with a certain pressure, the length of the magnetostrictive member is increased, A preload spring that pushes the push rod by an elastic restoring force when the length of the magnetostrictive member is reduced when the rod is lowered; A chamber installed in the space portion and filled with a fluid and communicating with a discharge nozzle installed at a lower end of the housing; A fluid supply nozzle provided inside the housing and connected to a fluid storage tank having one end communicated with the chamber and the other end disposed outside the housing; When the chamber is slid in the vertical direction of the chamber while it is sandwiched in the chamber and is lowered in the lower direction of the chamber, the fluid filled in the chamber is discharged to the outside of the discharge nozzle through the discharge nozzle, A needle for sucking the fluid stored in the fluid storage tank into the chamber through the fluid supply nozzle; When the push rod is lowered, the displacement of the push rod is amplified by the hydraulic pressure to lower the needle. On the other hand, when the push rod is raised, the displacement of the push rod is amplified through the hydraulic pressure And the magnetostrictive member whose length is increased by the magnetic field generated from the magnetic field generating portion pushes down the push rod and the preload spring is contracted and the displacement amplifying means pushes the needle by using the hydraulic pressure, When the length of the magnetostrictive member is reduced by the magnetic field generated by the magnetic field generating unit, the shrinked preload spring is resiliently restored to push up the push rod and the push rod is raised Wherein the displacement amplifying means is configured to lower And draws the fluid stored in the fluid storage tank into the chamber through the fluid supply nozzle.

The hydraulic displacement-amplifying type magnetostrictive inkjet head according to the present invention constructed as described above is a power source for raising and lowering a needle, and changes the amount of change of the magnetostrictive member (depending on the magnitude of the surrounding magnetic field) Displacement amplification means can be used to increase the displacement of the needle, that is, the upward and downward movement range of the needle, and as the needle moves up and down, the fluid discharge pressure can be increased and the fluid of high viscosity such as an adhesive can be discharged.

Further, by using the hydraulic pressure that is adjusted in accordance with the length of the magnetostrictive member as the power source of the needle for discharging the fluid out of the nozzle or introducing the fluid into the chamber, it is not necessary to apply high voltage or heat to the fluid introduced into the chamber There was an advantage.

In addition, the magnetostrictive member for adjusting the hydraulic pressure has an advantage that the application range is wide because it can exert a higher driving force than the piezo element.

In addition, the magnetostrictive member has an advantage that it can respond more quickly to an input current than a conventional piezo element, and the frequency range of the input current is also broad.

1 is a longitudinal sectional view of a conventional ink jet head,
2 is a longitudinal sectional view of the present invention.
FIG. 3 is a view for explaining the principle of displacement amplification means provided in the present invention; FIG.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, a hydraulic displacement amplification type magnetostrictive inkjet head according to the present invention includes a housing 3 having a space 1 therein; A magnetic field generator 5 mounted in the space 1 and generating a magnetic field having a direction and an intensity that are different from each other according to an input current amount or a current direction; A magnetostrictive member 7 sandwiched in the magnetic field generating portion 5 and varying in length according to the intensity and direction of a magnetic field generated from the magnetic field generating portion 5; The magnetostrictive member 7 is disposed at the lower portion of the magnetostrictive member 7 in the space portion 1 and the upper surface of the magnetostrictive member 7 abuts against the bottom surface of the magnetostrictive member 7, A push rod 11, which is pushed downwardly and extended in a horizontal direction on a circumferential surface thereof; Shaped spring is supported by a pushing rod 13 which penetrates the push rod 11 and whose lower end is formed on the inner wall of the space portion 1 and whose upper end abuts the bottom face of the extension plate 9 of the push rod 11, The length of the magnetostrictive member 7 is increased by pushing up the push rod 11 and the push rod 11 is lowered by the extension plate 9 while the length of the magnetostrictive member 7 is reduced A preload spring 15 for pushing up the push rod 11 by an elastic restoring force; A chamber 19 installed inside the space part 1 and filled with a fluid and communicating with a discharge nozzle 17 provided at the lower end of the housing 3; A nozzle (23) disposed inside the housing (3) and having one end communicated with the chamber (19) and the other end connected to a fluid storage tank provided outside the housing (3); When the chamber 19 is slid in the vertical direction of the chamber 19 while being inserted into the chamber 19 and is lowered in the downward direction of the chamber 19, the fluid filled in the chamber 19 is discharged through the discharge nozzle 17 A needle 25 for sucking the fluid stored in the fluid storage tank into the chamber 19 through the fluid supply nozzle 23 when the fluid is raised upward in the chamber 19 while being discharged out of the discharge nozzle 17, (Needle); And the space 19 between the push rod 11 and the chamber 19 so that when the push rod 11 is lowered, the displacement of the push rod 11 is amplified through the hydraulic pressure to lower the needle 25 And a displacement amplifying means 27 for amplifying the displacement of the push rod 11 via hydraulic pressure to raise the needle 25 when the push rod 11 is lifted. The magnetostrictive member 7 whose length is increased by the magnetic field pushes down the push rod 11 and the preload spring 15 is contracted and the displacement amplifying means 27 pushes the needle 25 using the hydraulic pressure, When the length of the magnetostrictive member 7 is reduced by the magnetic field generated from the magnetic field generating unit 5, the contracted preload spring 15 is resiliently deformed The push rod 11 is pushed up and the push rod 1 1) is elevated, the displacement amplifying means 27 lifts the lowered needle 25 by using the hydraulic pressure and sucks the fluid stored in the fluid storage tank into the chamber 19 through the fluid supply nozzle 23 .

The magnetic field generating unit 5 includes a permanent magnet 29 installed in the space 1 and generating a magnetic field having a fixed intensity and direction and a permanent magnet 29 inserted in the permanent magnet 29, A magnetic field generated from the permanent magnet 29 and the coil bundle 31 is scattered over the upper surface of the permanent magnet 29 and the coil bundle 31 so that the magnetic field generated by the permanent magnet 29 and the coil bundle 31 is disturbed. An upper flux passing portion 33 for concentrating and flowing the flux on the permanent magnet 29 and the coil bundle 31; And the magnetic field generated from the permanent magnet 29 and the coil bundle 31 is not disturbed and is concentrated on the lower portion of the permanent magnet 29 and the coil bundle 31 by being mounted on the bottom surface of the permanent magnet 29 and the coil bundle 31. [ And a lower flux passing portion 35 in which a magnetostrictive member 7 and an upper end of the push rod 11 are inserted and formed is formed at the center of the coil bundle 31, And the length is increased or decreased according to the intensity and direction of the combined magnetic field of the permanent magnet 29 and the coil bundle 31. [

The displacement amplification principle of the displacement amplification means will now be described with reference to FIG.

이 된다.Since the amount of fluid movement in the closed region is the same, the displacement amplification ratio is

.

here,

은 상부 플레이트의 단면적이고,remind

Sectional area of the upper plate,

은 니들의 단면적,remind

The cross-sectional area of the needle,

은 상부 플레이트의 변위이고,remind

Is the displacement of the top plate,

은 니들의 변위이다.remind

Is the displacement of the needle.

이

의 10배일 경우 변위

는 변위

의 10배가 된다.For example,

this

10 times the displacement

Displacement

Which is 10 times larger than

In other words, when the displacement of the magnetostrictive member is 0.01 mm, the displacement of the needle becomes 0.1 mm, theoretically, the fluid ejection capability can be increased 10 times.

The displacement amplifying means 27 is provided with an upper plate mounting hole 41 through which the hydraulic oil 37 for pushing up or pulling up the needle 25 is filled and an upper plate 39 is fitted on the upper surface, A hydraulic oil tank 45 in which a needle mounting hole 43 through which the push rod 11 is inserted is fitted in the upper plate mounting hole 41. When the push rod 11 is lowered by being connected to the lower end of the push rod 11, The upper plate 39 for pulling up the lowered needle 25 by pulling up the hydraulic oil 37 when the push rod 11 is raised while pushing down the needle 25 by pushing the hydraulic oil 37 filled in the tank 45 ).

A hooking protrusion 71 is provided along the upper edge of the needle 25 at the upper edge of the needle 25 that is drawn into the hydraulic oil tank 45 through the needle installation hole 43, (25) can not escape.

The hydraulic oil tank 45 has a body 47 in which an interior is empty and upper and lower ends are opened and hydraulic oil 37 is filled in the hydraulic oil tank 45, A lower cap 51 covering the lower end of the body 47 and penetrating the needle installation hole 43 at the center thereof, an upper cap 49 having an upper plate mounting hole 41 through which the body 47 An upper gasket 53 sandwiched between the upper cap 49 and the upper cap 49 so as to seal the hydraulic oil 37 filled in the body 47 from the gap between the body 47 and the upper cap 49, And a lower gasket 55 sandwiched between the body 47 and the lower cap 51 so as to seal the hydraulic oil 37 filled in the body 47 so as not to leak into the gap between the body 47 and the lower cap 51.

The lower surface of the upper plate 49 is machined with two or more downward tilts 57 within a predetermined radius around the upper plate mounting hole 41 and the upper surface of the upper plate 39 is formed with an upper plate 39 Two or more layers of upwardly projecting tines 59 are machined within a predetermined radius, and the upward and downward tines 59 and 57 are engaged with each other.

The housing 3 is provided with an upper housing 63 having an upper space portion 61 and a lower space portion 65 communicating with the upper space portion 61. The upper housing 63 And a lower housing 67 connected to the lower housing 67. The lower housing 67 is formed into an end conical shape and the upper space portion 61 is provided with a magnetic field generating portion 5 and a magnetostrictive member 7 The expansion chamber 9, the push rod 11 and the preload spring 15. The lower space portion 65 is provided with a discharge nozzle 17, a chamber 19, a fluid supply nozzle 23, The needle 25, and the displacement amplifying means 27 are mounted.

A preload spring insertion groove 69 into which the upper end of the preload spring 15 is inserted is formed on the underside of the extension plate 9 which contacts the preload spring 15. [

The operation of the hydraulic displacement amplification type magnetostrictive inkjet head of the present invention having the above structure will now be described with reference to FIG.

The magnetostrictive member 7 whose length is increased by the magnetic field generated from the magnetic field generating unit 5 pushes the push rod 11 downward.

When the push rod 11 is lowered, the preload spring 15 is pressed against the extension plate 9 integrally coupled to the push rod 11 and the upper plate 39 connected to the push rod 11 is pushed The needle 25 is pushed down by the compressed hydraulic oil 37 and descended so that the fluid filled in the chamber 19 is discharged to the outside of the chamber 19. The hydraulic fluid 37 is compressed by the hydraulic fluid 37 filled in the hydraulic oil tank 45, And is jetted out of the discharge nozzle (17).

When the length of the magnetostrictive member 7 is reduced by the magnetic field generated from the magnetic field generator 5, the contracted preload spring 15 is resiliently restored and the extension plate 9 And at the same time the push rod 11 and the upper plate 39 are lifted along the extension plate 9.

On the other hand, the raised upper plate 39 sucks the hydraulic oil 37 filled in the hydraulic oil tank 45, and then the fluid stored in the fluid storage tank is lifted up by the lowered needle 25, (19).

The hydraulic displacement-amplification type magnetostrictive inkjet head according to the present invention constructed as described above includes hydraulic oil 37 whose pressure is regulated according to the length of the magnetostrictive member 7 as a power source for raising and lowering the needles It is possible to increase the displacement of the needle 25, that is, the upward / downward movement range of the needle 25, and as the needle 25 is moved up and down, the fluid discharge pressure can be increased, It may be discharged.

It is also possible to introduce the fluid into the chamber 19 by using the hydraulic pressure adjusted according to the length of the magnetostrictive member 7 as the power source of the needle 25 that sends out the fluid to the outside of the nozzle or into the chamber 19 And there is no need to apply high voltage or heat to the inflow fluid.

In addition, the magnetostrictive member 7 for controlling the hydraulic pressure can exert a higher driving force as compared with the piezo element, and thus has a wide application range.

In addition, the magnetostrictive member 7 has an advantage that it can respond more quickly to an input current than a conventional piezo element, and the frequency range of an input current is also broad.

1. Space part 3. Housing
5. Magnetic field generator 7. Magnetostrictive member
9. Extension 11. Push rod
13. Jaws 15. Preload spring
17. Dispensing nozzle 19. Chamber
25. Needle 27. Displacement amplifying means
29. Permanent magnet 31. Coil bundle
33. Upper flux passing portion 35. Lower flux passing portion
37. Hydraulic oil 39. Top plate
41. Upper plate mounting hole 43. Needle mounting hole
45. Hydraulic oil tank 47. Body
49. Upper cap 51. Lower cap
53. Upper Gasket 55. Lower Gasket
57. Downward Tilt 59. Upper Tilt
61. Upper space part 63. Upper housing part
65. Lower space part 67. Lower housing part
69. Preload spring insertion slot 71. Locking protrusion

Claims (4)

A housing (3) having a space (1) therein;
A magnetic field generator 5 mounted in the space 1 and generating a magnetic field having a direction and an intensity that are different from each other according to an input current amount or a current direction;
A magnetostrictive member 7 sandwiched in the magnetic field generating portion 5 and varying in length according to the intensity and direction of a magnetic field generated from the magnetic field generating portion 5;
The magnetostrictive member 7 is disposed at the lower portion of the magnetostrictive member 7 in the space portion 1 and the upper surface of the magnetostrictive member 7 abuts against the bottom surface of the magnetostrictive member 7, A push rod 11, which is pushed downwardly and extended in a horizontal direction on a circumferential surface thereof;
Shaped spring is supported by a pushing rod 13 which penetrates the push rod 11 and whose lower end is formed on the inner wall of the space portion 1 and whose upper end abuts the bottom face of the extension plate 9 of the push rod 11, The length of the magnetostrictive member 7 is increased by pushing up the push rod 11 and the push rod 11 is lowered by the extension plate 9 while the length of the magnetostrictive member 7 is reduced A preload spring 15 for pushing up the push rod 11 by an elastic restoring force;
A chamber 19 installed inside the space part 1 and filled with a fluid and communicating with a discharge nozzle 17 provided at the lower end of the housing 3;
A nozzle (23) disposed inside the housing (3) and having one end communicated with the chamber (19) and the other end connected to a fluid storage tank provided outside the housing (3);
When the chamber 19 is slid in the vertical direction of the chamber 19 while being inserted into the chamber 19 and is lowered in the downward direction of the chamber 19, the fluid filled in the chamber 19 is discharged through the discharge nozzle 17 A needle 25 for sucking the fluid stored in the fluid storage tank into the chamber 19 through the fluid supply nozzle 23 when the fluid is raised upward in the chamber 19 while being discharged out of the discharge nozzle 17, (Needle);
And the space 19 between the push rod 11 and the chamber 19 so that when the push rod 11 is lowered, the displacement of the push rod 11 is amplified through the hydraulic pressure to lower the needle 25 And a displacement amplifying means 27 for amplifying the displacement of the push rod 11 via the hydraulic pressure to raise the needle 25 when the push rod 11 is raised,
The magnetostrictive member 7 whose length is increased by the magnetic field generated from the magnetic field generating portion 5 pushes down the push rod 11 and the preload spring 15 is contracted and the displacement amplifying means 27 uses the hydraulic pressure When the length of the magnetostrictive member 7 is reduced by the magnetic field generated from the magnetic field generating unit 5 while the needle 25 is pushed down and the fluid filled in the chamber 19 is discharged out of the discharge nozzle 17 As the push rod 11 is lifted up, the displacement amplifying means 27 lifts the lowered needle 25 by using the hydraulic pressure, so that the fluid A hydraulic displacement amplification type magnetostrictive ink jet head for sucking fluid stored in a fluid storage tank into a chamber (19) through a supply nozzle (23).
The method according to claim 1,
The magnetic field generating unit 5 includes a permanent magnet 29 installed in the space 1 and generating a magnetic field having a fixed intensity and direction,
A coil bundle 31 which is inserted into the permanent magnet 29 and generates a magnetic field having a direction different from that of the current according to the input current amount or current direction,
The magnetic field generated from the permanent magnet 29 and the coil bundle 31 is not disturbed and is concentrated on the permanent magnet 29 and the upper portion of the coil bundle 31 by covering the upper surface of the permanent magnet 29 and the coil bundle 31 An upper flux passing portion 33 for flowing the flux;
And the magnetic field generated from the permanent magnet 29 and the coil bundle 31 is not disturbed and is concentrated on the lower portion of the permanent magnet 29 and the coil bundle 31 by being mounted on the bottom surface of the permanent magnet 29 and the coil bundle 31. [ And a lower flux passing portion 35 in which a magnetostrictive member 7 and a passageway for carrying the upper end of the push rod 11 are formed at the center,
Wherein the magnetostrictive member 7 is fitted in the coil bundle 31 and the length is increased or decreased according to the strength and direction of the combined magnetic field of the permanent magnet 29 and the coil bundle 31. [ Amplified magnetostrictive inkjet head.
The method according to claim 1,
The displacement amplifying means 27 is provided with an upper plate mounting hole 41 through which the hydraulic oil 37 for pushing up or pulling up the needle 25 is filled and an upper plate 39 is fitted on the upper surface, A hydraulic oil tank 45 through which the needle installation hole 43 is fitted,
When the push rod 11 is lowered by being pushed into the upper plate mounting hole 41 and connected to the lower end of the push rod 11, the hydraulic oil 37 filled in the hydraulic oil tank 45 is pushed to push down the needle 25 And an upper plate (39) for pulling up the hydraulic oil (37) when the push rod (11) is lifted up to pull up the lowered needle (25).
The method of claim 3,
A hooking protrusion 71 is provided along the upper edge of the needle 25 at the upper edge of the needle 25 that is drawn into the hydraulic oil tank 45 through the needle installation hole 43, (25) can not escape from the outer circumferential surface.

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