JP2004025657A - Ink jet head - Google Patents

Ink jet head Download PDF

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Publication number
JP2004025657A
JP2004025657A JP2002186091A JP2002186091A JP2004025657A JP 2004025657 A JP2004025657 A JP 2004025657A JP 2002186091 A JP2002186091 A JP 2002186091A JP 2002186091 A JP2002186091 A JP 2002186091A JP 2004025657 A JP2004025657 A JP 2004025657A
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JP
Japan
Prior art keywords
nozzle plate
nozzle
printing surface
resist
step
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP2002186091A
Other languages
Japanese (ja)
Inventor
Takeshi Eguchi
Atsushi Ito
Yasuisa Kobayashi
Toshiya Matsuyama
Yumiko Ohashi
伊藤 敦
大橋 弓子
小林 靖功
松山 敏也
江口 毅
Original Assignee
Brother Ind Ltd
ブラザー工業株式会社
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 Brother Ind Ltd, ブラザー工業株式会社 filed Critical Brother Ind Ltd
Priority to JP2002186091A priority Critical patent/JP2004025657A/en
Priority claimed from US10/600,612 external-priority patent/US7086154B2/en
Publication of JP2004025657A publication Critical patent/JP2004025657A/en
Application status is Pending legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2/14201Structure of print heads with piezoelectric elements
    • B41J2002/14306Flow passage between manifold and chamber

Abstract

Provided is an ink jet head capable of reducing clogging of a nozzle hole due to ink and ensuring wettability of ink in the nozzle hole.
An ink jet head having a flat plate laminated structure for ejecting ink to a printing surface, which is provided in an ink jet recording apparatus, includes a part of the ink jet head and a nozzle plate having nozzle holes. The surface facing the printing surface is coated with water-repellent plating, and the plating film 52 is configured not to enter the inside of the nozzle hole.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inkjet head of an inkjet recording apparatus that forms a desired image by ejecting ink onto a printing surface.
[0002]
[Prior art]
Conventionally, a plurality of thin flat plates in which a space has been formed in advance by etching or the like are stacked and adhered to connect the spaces to each other to form a manifold flow path, an ink flow path such as a pressure chamber or a nozzle hole. The technology of an ink jet head having a structure in which is formed is known.
[0003]
A surface of the plate (nozzle plate) on which the nozzle holes are formed among the plates constituting the ink jet head, the surface facing the printing surface of the plate to prevent the ejected ink from adhering to the nozzle plate. There is also known a film having a water-repellent plating film formed thereon.
[0004]
[Problems to be solved by the invention]
Here, from the viewpoint of reliably preventing the ink ejected from the nozzle hole from adhering to the nozzle plate, the plating film is formed to the very edge of the opening of the nozzle hole, and at the opening portion of the nozzle hole. It is desirable to be able to prevent the ink from staying wet.
However, it has been difficult to control the plating process so that the plating film is formed up to the edge of the opening as described above. In particular, in recent circumstances where the diameter of nozzle holes has become smaller and more highly integrated due to the demand for higher image quality, it has been extremely difficult to stably form a plating film up to the edge of the opening. Was.
[0005]
In addition, from the above viewpoint, an inkjet head having a configuration in which the plating film formed on the surface of the nozzle plate is positively inserted from the opening to the inner surface of the nozzle hole is also known. Indeed, according to this configuration, it is possible to prevent the ink droplets from adhering around the openings of the nozzle holes and remaining wet.
However, in this configuration, since the water-repellent plating film is formed to the inside of the nozzle hole, the wettability of the ink inside the nozzle hole is reduced, and for example, a good meniscus of the ink is stably formed in the nozzle hole portion. Therefore, there is a problem that it cannot be formed.
[0006]
The present invention has been made in view of the above points, and an object of the present invention is to provide an ink jet head which can reduce clogging of a nozzle hole by ink and can ensure the wettability of ink in the nozzle hole. is there.
[0007]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
[0008]
That is, in claim 1, an ink jet head for ejecting ink to a printing surface, which is provided in an ink jet recording apparatus, and forms a part of the ink jet head and has a nozzle plate having nozzle holes, Water repellent plating is applied to the surface facing the printing surface, and the plating film is configured not to enter the inside of the nozzle hole.
[0009]
In claim 2, the first step is that the nozzle plate forms at least a penetrating nozzle hole by pressing the nozzle plate from the side opposite to the printing surface. A second step, in which a resist is applied to the surface opposite to the surface and the resist is filled in the nozzle holes formed in the first step, a polishing process is performed on the printing surface side of the nozzle plate. Applying a third step, applying a water-repellent plating to the printing surface side of the nozzle plate, a fourth step, removing the resist from the nozzle plate and removing the resist, and a fifth step. Things.
[0010]
In claim 3, the nozzle plate is placed on at least a resist layer formed in advance with the nozzle plate having a nozzle hole formed in advance with the printing surface side facing upward. Filling the resist into the nozzle hole by capillary action; applying a water-repellent plating to the print surface side of the nozzle plate; removing the resist from the nozzle plate by removing the resist from the nozzle plate , And a third step.
[0011]
The ink jet head according to claim 4, which is provided in the ink jet recording apparatus and ejects ink to a printing surface, wherein a nozzle plate that forms a part of the ink jet head and has a nozzle hole faces the printing surface. Water-repellent plating is applied to the surface to be coated, and high-energy rays are applied to a portion of the plating film that has entered the nozzle hole, so that the water-repellency of the portion is lost.
[0012]
In claim 5, the nozzle plate has at least: a nozzle plate having a nozzle hole formed in advance; a print surface side of the nozzle plate faces downward; and the nozzle hole has a print surface side. A first step, in which the opening formed in the nozzle plate is floated, a resist is applied to the nozzle plate in the above state by bar coating from above, a second step, It is manufactured by a method including a third step of applying water plating, and a fourth step of removing and removing the resist from the nozzle plate.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the invention will be described.
FIG. 1 is a side view showing the overall configuration of an ink jet recording apparatus (ink jet printer) according to one embodiment of the present invention.
FIG. 2 is a bottom view showing a state in which the inkjet heads are provided side by side, and FIG. 3 is an enlarged side view of the inkjet head. FIG. 4 is a cross-sectional view of the ink jet head main body, showing an ink flow path in the flow path unit.
[0014]
FIG. 1 shows a schematic configuration of a color inkjet printer (inkjet recording apparatus) 1 including four inkjet heads 2 according to the present embodiment. The printer 1 includes a paper feed unit 11 on the left side in the figure and a paper discharge unit 12 on the right side in the figure, and a paper transport path flowing from the paper supply unit 11 to the paper discharge unit 12 is inside the apparatus. Is formed.
[0015]
A specific configuration of the paper transport path will be described.
Immediately downstream of the paper feed unit 11, paper feed rollers 5.5 are provided to feed a paper as an image recording medium from left to right in the figure. In the middle part of the paper transport path, there are provided two belt rollers 6, 7 and a loop-shaped transport belt 8 wound around the rollers 6, 7. The outer peripheral surface (conveying surface) of the conveying belt 8 is subjected to a silicone treatment, and the paper conveyed by the feed rollers 5.5 is held on the conveying surface on the upper side of the conveying belt 8 by its adhesive force. By driving one of the belt rollers 6, the sheet can be conveyed downstream (to the right).
Reference numeral 9 denotes a pressing member, which presses the paper against the transport surface of the transport belt 8 so that the paper on the transport belt 8 does not float from the transport surface and securely adheres the paper to the transport surface. .
[0016]
A peeling mechanism 10 is provided on the right side of the transport belt 8 in the drawing, and peels off the paper adhered to the transport surface of the transport belt 8 from the transport surface and moves the paper to the right paper discharge unit 12. It is configured to send.
[0017]
The inkjet heads 2 of the printer 1 are provided in a row along the paper transport direction, corresponding to four color inks (magenta, yellow, blue, and black). As shown in FIG. 2, which is a view from the lower surface side, the inkjet head 2 is formed in an elongated rectangular shape having a longitudinal direction perpendicular to the paper transport direction, and a head body 18 attached to the lower surface has ink Are formed side by side with a large number of micro-sized nozzle holes 13 for jetting downward.
The lower surface of the ink-jet head 2 is arranged while forming a small gap between the ink-jet head 2 and the conveying surface of the conveying belt 8, and a sheet conveying path is formed in the gap. In this configuration, the paper conveyed on the conveyance belt 8 sequentially passes immediately below the head body 18 of the four inkjet heads 2, and passes through the nozzle holes 13 through the nozzle holes 13 toward the upper surface (print surface) of the paper. By jetting the ink, a desired color image can be formed.
[0018]
FIG. 3 is an enlarged side view of a portion of the inkjet head 2, and the inkjet head 2 is mounted via a holder 15 to an appropriate member 14 provided on the printer 1 side. The holder 15 is formed in an inverted “T” shape having a vertical portion 15 a and a horizontal portion 15 b in a side view. The vertical portion 15 a is attached to the printer main body side by a screw 16 while the horizontal portion 15 b On the lower surface, the base block 17 and the head main body 18 are fixed via a spacer member 40.
The base block 17 has a flat plate laminated structure as shown in FIG. 3, and an ink flow path 17a for guiding ink from an ink supply source (not shown) to an ink supply port 18a of the head main body 18 is formed therein. I have.
[0019]
Next, the configuration of the head main body 18, which is a main part of the inkjet head 2, will be described.
The head main body 18 includes a flow path unit 20 in which a number of pressure chambers and the nozzle holes 13 are formed, and a plurality of trapezoidal plate-shaped actuator units 19 which are adhered side by side on the upper surface thereof.
As shown in FIG. 4, the channel unit 20 has a structure in which nine thin stainless steel flat plates 21 to 29 are stacked. A manifold channel 30 is formed so as to straddle the flat plates 25 to 27 of the fifth to seventh layers counted from the top, and the channel 30 communicates with the above-described ink supply port 18a. A communication hole 31 is formed in the fourth layer flat plate 24 located immediately above, and this communication hole 31 is connected to a narrowed portion 32 formed in the third layer flat plate 23.
[0020]
The throttle portion 32 communicates with one end of a pressure chamber 34 formed in the first layer flat plate 21 through a communication hole 33 formed in the second layer flat plate 22. The pressure chambers 34 are for applying pressure to the ink under the driving of the actuator unit 19, and are provided one for each of the multiple nozzle holes 13. The other end of the pressure chamber 34 is connected to the nozzle hole 13 formed in the ninth layer flat plate (nozzle plate) 29 through a nozzle communication hole 35 formed through the second to eighth layer flat plates. ing.
[0021]
In the above configuration, ink is introduced from the ink supply source through the ink supply port 18a through the ink flow path 17a in the base block 17, and reaches the manifold flow path 30 in the flow path unit 20. The ink supplied from the communication hole 31 to the pressure chamber 34 via the throttle portion 32 and the communication hole 33 is applied with pressure by driving the actuator unit 19 described later, and is supplied to the nozzle hole via the nozzle communication hole 35. Injection reaches 13.
[0022]
The above-described manifold flow path 30, pressure chamber 34, throttle section 32, holes 31, 33, 35, etc. are formed in the flat plates 21 to 28 by etching, and the nozzle holes 13 of the nozzle plate 29 are formed by press working. Is formed.
[0023]
The outline of the actuator unit 19 will be described. The actuator unit 19 includes, for example, stacking a plurality of thin piezoelectric sheets made of a lead zirconate titanate (PZT) -based ceramic material and interposing an electrode film made of a thin Ag-Pd-based metal material between the piezoelectric sheets. Thus, one active portion is formed corresponding to each of the pressure chambers 34.
In this configuration, when a potential difference is given between the paired electrodes, the active portion is deformed so as to be convex toward the pressure chamber 34 side. As a result, the volume of the pressure chamber 34 is reduced, and a pressure for jetting is applied to the ink inside the pressure chamber 34.
[0024]
As shown in FIG. 4, one end of a flexible flat cable 41 is adhered to the upper surface of the actuator unit 19, and this cable 41 is pulled out from the head main body 18 as shown in FIG. Has been issued. The above-described electrodes of the actuator unit 19 are electrically connected to a driver IC (not shown) for controlling printing via a conductive wire in the flexible flat cable 41.
Reference numeral 42 denotes a silicone adhesive spread over the side of the head main body 18 to protect the flexible flat cable 41 from being strongly bent at a portion where the flexible flat cable 41 is drawn out, and to apply ink to the actuator unit 19 at the portion. Play a role in preventing the intrusion of the like.
[0025]
Next, a method for forming water-repellent plating on the above-described nozzle plate 29 will be described.
That is, the nozzle plate 29 of the present embodiment is provided with water-repellent plating on the surface facing the printing surface (the surface closer to the printing surface). As a result, it is possible to prevent the ejected ink from getting wet and remaining at the opening and causing clogging of the nozzle hole 13.
Hereinafter, first to fourth methods for forming the water-repellent plating will be described. Note that any of the following methods is performed on the nozzle plate 29 in a stage before being laminated and adhered to the other flat plates 21 to 28.
[0026]
[First method]
First, the first method will be described with reference to FIG.
FIG. 5 is a diagram illustrating a first method of applying a water-repellent plating film to a nozzle plate.
[0027]
{Circle around (1)} In this method, first, as shown in FIG. 5 (a), the nozzle plate 29 is pressed from the side opposite to the printing surface side using a mold 50 having many tapered projections. As a result, the nozzle holes 13 are formed in the nozzle plate 29 in such a manner that the nozzle holes 13 gradually become thinner toward the printing surface side, as shown in FIG.
At this time, the nozzle holes 13 are formed so as to penetrate in the vertical direction (that is, the nozzle holes 13 form the openings 13 a in the printing surface side of the nozzle plate 29 at the stage of press working). The shape of the mold is set in advance.
[0028]
{Circle around (2)} Next, masking with resist is performed.
In this masking step, first, the nozzle plate 29 is immersed in an appropriate alkaline solution to be degreased. Thereafter, as shown in FIG. 5C, a heat-drying resist 51 is applied to the nozzle plate 29 from the surface opposite to the printing surface by a bar coating method.
Simultaneously with the application, the resist is filled into the nozzle hole 13, and the resist 51 sticks out and protrudes from the opening 13 a formed on the printing surface side of the nozzle plate 29 to the printing surface side. Thus, the coating speed of the bar coat, the viscosity and amount of the resist ink, and the like are adjusted. Since the nozzle hole 13 is formed in a penetrating shape as described above, the air inside the nozzle hole 13 escapes through the opening 13a at the time of filling the resist. Easy.
After the application of the resist 51, the nozzle 51 is placed in a high-temperature environment of 100 ° C. or higher for several minutes, and the resist 51 is dried and hardened.
[0029]
{Circle around (3)} Subsequently, a lapping process (polishing process) is performed on the surface of the nozzle plate 29 on the printing surface side.
As a result, as shown in FIG. 5 (d), the burr 13b generated by the above-described press working is removed, the shape of the opening 13a is adjusted, and at the same time, the nozzle hole 13 projects from the opening 13a toward the printing surface side. The resist (portion indicated by reference numeral 51a in FIG. 5 (c)) is also removed.
As described above, by adopting a method of removing the protruding portion 51a of the resist 51 by polishing the surface on the printing surface side of the nozzle plate 29, the resist 51 is removed from the nozzle plate 29 as shown in FIG. The surface of the resist 51 is cut so as to be flush with the surface on the printing surface side (the cut surface of the resist 51 is indicated by reference numeral 51b).
That is, the resist 51 does not retract from the opening 13a of the nozzle hole 13, nor does the resist 51 project from the opening 13a toward the printing surface. Accordingly, the inner surface of the nozzle hole 13 is masked by the resist 51 up to the margin of the opening 13a, and at the same time, the surface of the nozzle plate 29 on the printing surface side is exposed to the margin of the opening 13a.
[0030]
{Circle around (4)} Then, the surface on the printing surface side of the nozzle plate 29 is subjected to water-repellent plating.
In this step, first, the nozzle plate 29 is immersed in an aqueous nitric acid solution to perform an acid activation treatment, and then strike Ni plating is performed. This is for improving the adhesion of a water-repellent plating film described later to the nozzle plate 29 made of stainless steel. In addition, Ni sulfamate plating is also performed as needed.
Then, a water-repellent plating made of Ni-PTFE (Poly Tetra Fluoro Ethylene) is applied, and a plating film 52 having a thickness of 0.5 to 3 μm is formed on the printing surface side of the nozzle plate 29 as shown in FIG. Form on the surface.
[0031]
Since the surface of the nozzle plate 29 on the side opposite to the printing surface and the inner surface of the nozzle hole 13 are masked by the above-described resist 51, the water-repellent plating film 52 is not formed on these portions.
Masking is performed in such a manner that when a water-repellent plating film is formed on the surface of the nozzle plate 29 opposite to the printing surface, an adhesive is applied to this surface to form another plate (specifically, This is because there is a possibility that a sufficient adhesive strength cannot be obtained when the sheet is bonded to the flat plate 28) of the eighth layer. Further, when a water-repellent plating film is formed on the inner surface of the nozzle hole 13, the wettability of the ink on the inner surface of the nozzle hole 13 is greatly reduced, and for example, a good ink meniscus is stably formed on the nozzle hole 13. This is because an adverse effect such as the inability to form a film is considered.
[0032]
As described in the portion (3) (FIG. 5 (d)), the resist 51 is formed up to the edge of the opening 13a on the inner surface of the nozzle hole 13, and at the same time, the surface of the nozzle plate 29 on the printing surface side is formed. Is exposed to the very edge of the opening 13a. Then, since the above-mentioned water-repellent plating film 52 is formed in the exposed portion, the water-repellent plating film 52 is eventually formed at the edge of the opening 13a of the nozzle hole 13 as shown in FIG. And without penetrating into the inner surface of the nozzle hole 13.
Therefore, the ink droplets ejected from the nozzle holes 13 are reliably prevented from adhering and remaining on the rim portions of the openings 13a. As a result, clogging of the nozzle holes 13 by ink can be prevented, and a decrease in recording image quality can be prevented. On the other hand, since the water-repellent plating film 52 does not enter the inside of the nozzle hole 13, the wettability of the ink inside the nozzle hole 13 is ensured, and the ink ejection is smooth.
[0033]
(5) Next, the nozzle plate 29 is immersed in an aqueous solution of sodium hydroxide and allowed to stand for about 10 minutes, whereby the resist is peeled off from the nozzle plate 29 and removed. It is desirable that the nozzle plate 29 be ultrasonically vibrated in an aqueous solution of sodium hydroxide from the viewpoint of reliable peeling and removal of the resist 51.
[0034]
{Circle around (6)} After the nozzle plate is finally subjected to a heat treatment at a high temperature of 300 to 400 ° C., ultrasonic water washing or running water washing is performed, and foreign matters such as resist remaining in the inside of the nozzle holes 13 are washed away and removed.
As described above, the nozzle plate 29 is completed as shown in FIG. 5F, and the nozzle plate 29 is laminated and bonded to the other flat plates 21 to 28, whereby the above-described flow path unit 20 is configured.
[0035]
[Second method]
Next, the second method will be described with reference to FIG. 6, focusing on differences from the first method.
FIG. 6 is a view for explaining how the resist is filled in the nozzle holes in the second method of applying the water-repellent plating film.
[0036]
First, the nozzle holes 13 are formed in the nozzle plate 29 by press working. After that, at the stage before the masking step with the resist, the surface on the printing surface side of the nozzle plate 29 is lapped to prepare a burr in advance. Has been removed.
[0037]
Next, masking is performed by the following method, which is different from the first method described above.
That is, in the second method, as shown in FIG. 6A, a resist is applied on an appropriate flat plate 53, a resist layer 51 having an appropriate thickness is formed on the appropriate flat plate 53, and then degreased. The nozzle plate 29 that has been subjected to the processing is placed on the resist layer 51 with the printing surface side thereof facing upward.
[0038]
As a result, as shown in FIGS. 6B to 6C, the resist of the resist layer 51 located at the nozzle hole 13 is pulled up by capillary action and filled in the nozzle hole 13. However, the resist 51 can be pulled up against the gravity only in the nozzle hole 13 where the capillary phenomenon appears because the inside is thin and narrow. Therefore, the resist 51 protrudes upward from the nozzle hole 13 and rises from the upper surface of the nozzle plate 29. (That is, the surface of the nozzle plate 29 on the printing surface side).
Therefore, as in the first method described above, the inner surface of the nozzle hole 13 is masked by the resist 51 to the very edge of the opening 13a, and at the same time, the surface of the nozzle plate 29 on the printing surface side is It will be barely exposed.
Note that the degree to which the resist 51 is pulled up by the capillary phenomenon in the nozzle hole 13 is greatly affected by the viscosity of the resist 51. Therefore, the viscosity of the resist 51 is set in advance so that an appropriate pulling force acts on the resist 51. It has been adjusted.
[0039]
The subsequent steps of water-repellent plating treatment → heat treatment → cleaning are exactly the same as those in the first method described above, and therefore description thereof is omitted. As a result, similarly to FIG. 5F, the water-repellent plating film 52 can be formed to the very edge of the opening 13a of the nozzle hole 13, and clogging of the nozzle hole 13 by ink can be prevented.
[0040]
[Third method]
Next, a third method will be described with reference to FIG. In this method, a resist is not used at the time of masking, and a water-repellent plating film is once formed on the inner surface of the nozzle hole 13.
FIG. 7 is a view for explaining how the water repellency of the water repellent plating film in the nozzle hole is lost in the third method of applying the water repellent plating film.
[0041]
Specifically, similarly to the second method, the nozzle holes 13 are formed in the nozzle plate 29 by press working, and burrs are removed by lapping. Then, as shown in FIG. 7A, a masking tape 54 is attached to a surface of the nozzle plate 29 opposite to the printing surface side, and the surface is masked. In this third method, no masking is performed inside the nozzle hole 13.
Then, the same water-repellent plating process as in the first method is performed. As a result, a water-repellent plating film 52 is formed on the nozzle plate 29 on the printing surface side and on the inner surface of the nozzle hole 13, as shown in FIG. 7B.
[0042]
After that, after removing the masking tape 54, as shown in FIG. 7 (c), a high energy ray such as laser, plasma or the like is irradiated from the surface of the nozzle plate 29 on the side opposite to the printing surface side. The inner surface of the nozzle hole 13 is locally heated. When the above-mentioned PTFE used for the water-repellent plating film 52 is heated to 400 ° C. or more, the PTFE deteriorates and loses its water-repellent function, so that the water repellency of the inner surface of the nozzle hole 13 is lost and the wettability of the ink is reduced. Secured. Then, by changing the angle of the high-energy ray in various ways and making the high-energy ray incident on the nozzle hole 13 from various angles, the nozzle hole 13 is heated up to the edge of the opening 13a on the inner surface thereof, The water repellency of the water-repellent plating film 52 at that portion can be lost.
On the other hand, since the high energy ray is irradiated from the side opposite to the printing surface side, the surface of the nozzle plate 29 on the printing surface side (including the cut portion of the opening 13a of the nozzle hole 13) is irradiated with the above-described high energy ray. As a result, the water repellency of the water repellent plating film 52 is maintained without being lost.
As described above, the water repellent effect is imparted to the surface of the nozzle plate 29 on the printing surface side up to the rim portion of the opening 13a of the nozzle hole 13, while the inner surface portion of the nozzle hole 13 is at the margin of the opening 13a. Water repellency can be lost. Therefore, similarly to the first and second methods, clogging of the nozzle hole 13 by ink can be reliably prevented.
[0043]
[Fourth method]
Next, a fourth method will be described. This method has a feature in a method of applying a resist by a bar coating method. Hereinafter, a specific description will be given.
FIG. 8 is a diagram showing a method for applying a resist to a nozzle plate in a fourth method for applying a water-repellent plating film.
[0044]
First, similarly to the second method, after forming the nozzle holes 13 in the nozzle plate 29 by press working, lapping is performed on the surface of the nozzle plate 29 on the printing surface side to perform deburring.
Thereafter, as shown in FIG. 8, the nozzle plate 29 is placed on an appropriate table 55 with its surface opposite to the printing surface facing up. At this time, an appropriate spacer member 56 is interposed between the nozzle plate 29 and the table 55, and the presence of the spacer member 56 causes the nozzle hole 13 of the nozzle plate 29 to form an opening formed on the printing surface side. 13a is floating at an appropriate distance from the table 55. The spacer member 56 is arranged at a position avoiding the opening 13a of the nozzle hole 13, so that the opening 13a is not blocked by the spacer member 56.
[0045]
In this state, a resist 51 is applied to the upper surface of the nozzle plate 29 (that is, the surface opposite to the printing surface side) by bar coating.
In this case, similarly to the first method, the resist is filled into the nozzle hole 13 at the same time as the application, and the nozzle hole 13 is inserted through the opening 13 a formed on the printing surface side of the nozzle plate 29 through the resist 51. The coating speed of the bar coat, the amount of the resist ink, and the like are adjusted so that is slightly protruded toward the printing surface.
[0046]
Even if the resist 51 actually protrudes slightly from the opening 13a to the printing surface side (lower side), since the opening 13a is floating from the base 55, the resist 51 is placed in a narrow gap between the base 55 and the nozzle plate 29. It is prevented that the liquid enters the nozzle plate 29 on the printing surface side and adheres by capillary action.
Therefore, even if the resist is not lapped as in the first method, the inner surface of the nozzle hole 13 is masked by the resist 51 to the very edge of the opening 13a, and at the same time, the surface of the nozzle plate 29 on the printing surface side. Is exposed to the very edge of the opening 13a.
[0047]
The subsequent steps of water-repellent plating treatment → heat treatment → cleaning are exactly the same as in the first method described above. As a result, as shown in FIG. 5 (f), the water-repellent plating film 52 on the printing surface side of the nozzle plate 29 can be formed up to the crevice of the opening 13a of the nozzle hole 13, and the ink hole Clogging can be reliably prevented.
[0048]
Although the embodiments have been described above, the technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the water-repellent plating is Ni-PTFE plating, but the method is not limited as long as a water-repellent film can be formed on the nozzle plate 29.
[0049]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
[0050]
An inkjet head for ejecting ink to a printing surface, which is provided in an inkjet recording apparatus, wherein the nozzle plate, which forms a part of the inkjet head and has a nozzle hole, has Water-repellent plating is applied to the surface facing the printing surface, and since the plating film is configured not to enter the inside of the nozzle hole,
Since the print surface side of the nozzle plate is coated with water repellent, it is possible to prevent the ink ejected from the nozzle holes from adhering to the nozzle plate and clogging the nozzle holes. Further, since the water-repellent plating does not enter the inside of the nozzle hole, the wettability of the ink inside the nozzle hole is ensured, and the ink ejection is smooth.
[0051]
As shown in claim 2, the first step is that the nozzle plate forms at least a penetrating nozzle hole by pressing the nozzle plate from the side opposite to the printing surface. A resist is applied to the surface on the side opposite to the printing surface, and the resist is filled in the nozzle holes formed in the first step. A third step, applying water-repellent plating to the printing surface side of the nozzle plate, a fourth step, removing and removing the resist from the nozzle plate, a fifth step, Because
Since the nozzle hole is formed as a through hole in the nozzle plate and then the inside of the nozzle hole is filled with the resist, the air in the nozzle hole can be easily evacuated during filling, and masking with the resist can be performed smoothly and reliably.
Also, a method is used in which the resist is intentionally exposed from the nozzle hole when filling the resist, and a method of removing the exposed resist by polishing the surface on the printing surface side of the subsequent nozzle plate is used. Can be reliably masked by the resist up to the border between the nozzle plate and the surface on the printing surface side. Therefore, the water-repellent plating on the surface on the printing surface side of the nozzle plate can be formed up to the edge of the opening of the nozzle hole. As a result, clogging of the nozzle holes by ink can be reliably prevented.
Furthermore, since the polishing process can remove the resist that has come off and remove the burrs generated by the pressing process, the work can be streamlined and the number of manufacturing steps can be reduced.
[0052]
As shown in claim 3, the nozzle plate comprises: at least the nozzle plate on which a nozzle hole is formed in advance, on a resist layer formed in advance with the printing surface side facing up; Filling the resist into the nozzle hole by capillary action; applying a water-repellent plating to the printing surface side of the nozzle plate; and removing the resist from the nozzle plate by removing the resist from the nozzle plate. Because it is manufactured by the method including the third step,
By adjusting the conditions such as the viscosity of the resist, it is possible to fill the resist as a mask up to the opening of the nozzle hole. On the other hand, since the resist is pulled up in the nozzle hole against the gravity by the capillary action and filled, the resist does not reach the upper surface of the nozzle plate (that is, the surface of the nozzle plate on the printing surface side). Therefore, similarly to the second aspect, the water-repellent plating on the surface of the nozzle plate on the printing surface side can be formed up to the edge of the opening of the nozzle hole. As a result, clogging of the nozzle holes by ink can be reliably prevented.
[0053]
As shown in claim 4, an ink jet head provided in the ink jet recording apparatus, which ejects ink to a printing surface, wherein a nozzle plate that forms a part of the ink jet head and has a nozzle hole includes: Since the water-repellent plating is performed on the opposing surface, and the portion of the plating film that has entered the nozzle hole is irradiated with high-energy rays, so that the water-repellency of the portion is lost.
While the water repellency of the printing surface side of the nozzle plate can be ensured, the wettability of the ink inside the nozzle hole can be ensured by losing the water repellency of the plating film inside the nozzle hole. As a result, a water-repellent effect can be imparted to the surface of the nozzle plate on the printing surface side up to the edge of the opening of the nozzle hole, so that clogging of the nozzle hole by ink can be reliably prevented.
Further, according to this method, the trouble of masking for preventing water-repellent plating from being formed inside the nozzle hole can be omitted.
[0054]
As shown in claim 5, the nozzle plate has at least: a nozzle plate in which a nozzle hole is formed in advance, with the surface on the printing surface side facing downward, and the nozzle hole is on the printing surface side. The first step, in which the opening portion formed in the surface is floated, the resist is applied to the nozzle plate in the above state by bar coating from the upper side, the second step, on the printing surface side of the nozzle plate It is manufactured by a method that includes a third step of applying water-repellent plating, removing and removing the resist from the nozzle plate, and a fourth step.
When the resist is applied to the nozzle plate with a bar coat and the nozzle holes are filled with the resist, even if the resist protrudes from the opening on the lower surface (the surface on the printing surface side of the nozzle plate), the opening does not float. Therefore, it is possible to prevent the projecting resist from wrapping around and adhering to the printing surface side of the nozzle plate. Therefore, the water-repellent plating on the print surface side of the nozzle plate can be formed up to the crevices at the openings of the nozzle holes, as in the second and third aspects. As a result, clogging of the nozzle holes by ink can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is a side view showing an overall configuration of an ink jet recording apparatus (ink jet printer) according to an embodiment of the present invention.
FIG. 2 is a bottom view showing a state in which inkjet heads are provided side by side.
FIG. 3 is an enlarged side view of the inkjet head.
FIG. 4 is a cross-sectional view of the ink jet head main body, showing an ink flow path in a flow path unit.
FIG. 5 is a diagram illustrating a first method of applying a water-repellent plating film to a nozzle plate.
FIG. 6 is a diagram illustrating a state in which a resist is filled in a nozzle hole in a second method of applying a water-repellent plating film.
FIG. 7 is a diagram illustrating a state in which the water repellency of a water repellent plating film in a nozzle hole is lost in a third method of applying a water repellent plating film.
FIG. 8 is a diagram showing a method for applying a resist to a nozzle plate in a fourth method of applying a water-repellent plating film.
[Explanation of symbols]
2 Inkjet head
13 Nozzle hole
13a Opening of nozzle hole
20 Channel unit
29 Nozzle plate
51 Resist
52 Water-repellent plating film

Claims (5)

  1. An inkjet head for ejecting ink to a printing surface, provided in the inkjet recording apparatus,
    A nozzle plate that forms a part of the inkjet head and has a nozzle hole is provided with a water-repellent plating on a surface facing the printing surface, and the plating film does not enter the inside of the nozzle hole. An ink jet head characterized by being configured as follows.
  2. The ink jet head according to claim 1, wherein the nozzle plate is manufactured by a method including at least the following first to fifth steps.
    A first step of forming a penetrating nozzle hole in the nozzle plate by pressing from a side opposite to the printing surface;
    A second step of applying a resist to the surface of the nozzle plate opposite to the printing surface and filling the inside of the nozzle holes formed in the first step with the resist;
    A third step of polishing the surface of the nozzle plate on the printing surface side.
    -The fourth step of applying a water-repellent plating to the printing surface side of the nozzle plate.
    A fifth step of removing and removing the resist from the nozzle plate.
  3. The inkjet head according to claim 1, wherein the nozzle plate is manufactured by a method including at least the following first to third steps.
    ・ The nozzle plate in which the nozzle holes are formed in advance is placed on a resist layer formed in advance with the printing surface side facing upward, and the resist is filled in the nozzle holes by capillary action. Do the first step.
    -The second step of applying a water-repellent plating to the printing surface side of the nozzle plate.
    A third step of removing and removing the resist from the nozzle plate;
  4. An ink jet head that is provided in the ink jet recording apparatus and ejects ink to a printing surface,
    A nozzle plate that forms a part of the ink jet head and has a nozzle hole is provided with a water-repellent plating on a surface facing the printing surface, and a high portion is provided in a portion of the plating film that has entered the nozzle hole. An ink jet head, characterized in that the water repellency of the portion is lost by irradiating an energy beam.
  5. The ink jet head according to claim 1, wherein the nozzle plate is manufactured by a method including at least the following first to fourth steps.
    The nozzle plate having a nozzle hole formed in advance, the printing surface side of the nozzle plate is directed downward, and the nozzle hole is formed in a state where the opening formed on the printing surface side is raised. One step.
    A second step of applying a resist to the nozzle plate in the above state by bar coating from above.
    -The third step of applying water-repellent plating to the printing surface side of the nozzle plate.
    A fourth step of removing and removing the resist from the nozzle plate;
JP2002186091A 2002-06-26 2002-06-26 Ink jet head Pending JP2004025657A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002186091A JP2004025657A (en) 2002-06-26 2002-06-26 Ink jet head

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
JP2002186091A JP2004025657A (en) 2002-06-26 2002-06-26 Ink jet head
US10/600,612 US7086154B2 (en) 2002-06-26 2003-06-23 Process of manufacturing nozzle plate for ink-jet print head
AT03014273T AT378180T (en) 2002-06-26 2003-06-25 Method for producing a nozzle plate for an ink irrigating head
DE2003617408 DE60317408T2 (en) 2002-06-26 2003-06-25 Method for producing a nozzle plate for an inkjet printhead
DE2003623697 DE60323697D1 (en) 2002-06-26 2003-06-25 Method for producing a nozzle plate for an inkjet printhead
EP07000598A EP1780021B1 (en) 2002-06-26 2003-06-25 Process of manufacturing nozzle plate for ink-jet print head
EP20030014273 EP1375154B1 (en) 2002-06-26 2003-06-25 Process of manufacturing nozzle plate for ink-jet print head
EP06016366A EP1717036B1 (en) 2002-06-26 2003-06-25 Process of manufacturing nozzle plate for ink-jet print head
DE2003623411 DE60323411D1 (en) 2002-06-26 2003-06-25 Method for producing a nozzle plate for an inkjet printhead
CN 03149096 CN1246152C (en) 2002-06-26 2003-06-26 Producing technology for ink-jet board of ink-jet printing head

Publications (1)

Publication Number Publication Date
JP2004025657A true JP2004025657A (en) 2004-01-29

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JP2002186091A Pending JP2004025657A (en) 2002-06-26 2002-06-26 Ink jet head

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JP (1) JP2004025657A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100687570B1 (en) * 2005-07-19 2007-02-27 삼성전기주식회사 Nozzle for ink jet head and method of the same
JP2008544852A (en) * 2005-07-01 2008-12-11 フジフィルム ディマティックス,インコーポレイテッド Non-wetting coating on fluid ejector
US8191993B2 (en) 2007-06-21 2012-06-05 Ricoh Company, Ltd. Nozzle plate for liquid ejector head, liquid ejector head, liquid ejector, liquid ejection method, inkjet recording apparatus, and inkjet recording method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008544852A (en) * 2005-07-01 2008-12-11 フジフィルム ディマティックス,インコーポレイテッド Non-wetting coating on fluid ejector
KR100687570B1 (en) * 2005-07-19 2007-02-27 삼성전기주식회사 Nozzle for ink jet head and method of the same
US8191993B2 (en) 2007-06-21 2012-06-05 Ricoh Company, Ltd. Nozzle plate for liquid ejector head, liquid ejector head, liquid ejector, liquid ejection method, inkjet recording apparatus, and inkjet recording method

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