JP3623249B2 - Recording head for inkjet printer - Google Patents

Recording head for inkjet printer Download PDF

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Publication number
JP3623249B2
JP3623249B2 JP35168793A JP35168793A JP3623249B2 JP 3623249 B2 JP3623249 B2 JP 3623249B2 JP 35168793 A JP35168793 A JP 35168793A JP 35168793 A JP35168793 A JP 35168793A JP 3623249 B2 JP3623249 B2 JP 3623249B2
Authority
JP
Japan
Prior art keywords
nozzle
pressure chamber
ink
flow path
recording head
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.)
Expired - Fee Related
Application number
JP35168793A
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Japanese (ja)
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JPH07195685A (en
Inventor
公平 北原
隆幸 石井
Original Assignee
セイコーエプソン株式会社
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Filing date
Publication date
Application filed by セイコーエプソン株式会社 filed Critical セイコーエプソン株式会社
Priority to JP35168793A priority Critical patent/JP3623249B2/en
Priority claimed from DE1994629021 external-priority patent/DE69429021T2/en
Publication of JPH07195685A publication Critical patent/JPH07195685A/en
Application granted granted Critical
Publication of JP3623249B2 publication Critical patent/JP3623249B2/en
Anticipated expiration legal-status Critical
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Description

[0001]
[Industrial application fields]
The present invention relates to a recording head for an ink jet printer.
[0002]
[Prior art]
In order to reduce the size of a recording head for an ink jet printer using a piezoelectric element in recent years, as shown in, for example, Japanese Patent Laid-Open No. 4-36643, an ink supply unit and a pressure common to each thin plate material are used. A so-called layered type in which an ink flow path leading to a chamber or a nozzle is formed and then laminated in order on the back surface of the nozzle plate has been adopted.
[0003]
In this type of recording head, not only the head itself can be made extremely small, but also the pressure chambers take up a large space and the length of the ink flow path leading to the nozzles is short and uniform. While the speed can be increased, there is a risk that fine bubbles mixed in the ink will enter and stay in the corners of the flow path formed in each thin plate material, which may adversely affect the ink ejection performance. doing.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of such problems, and an object of the present invention is to provide a new stacked recording head that can suppress the retention of bubbles in the ink flow path as much as possible. It is in.
[0005]
[Means for Solving the Problems]
That is, in order to achieve such a problem, the present invention provides an ink flow path from a pressure chamber having a substantially arc-shaped portion formed at an end portion on the nozzle side to a substantially circular nozzle located outside the region of the pressure chamber. In the recording head for an ink jet printer formed by continuation of substantially circular through holes provided in at least three thin plate members stacked on each other, each of the substantially circular through holes has an opening area of the pressure chamber. wherein are sequentially reduced in the yuku to the nozzle, also it has its center, are arranged by shifting the positions in order to be located on the line connecting the centers of said nozzle of the arcuate portion of the pressure chamber from.
[0006]
【Example】
Therefore, the embodiment illustrated below will be described.
FIG. 1 is a cross-sectional view of a recording head according to an embodiment of the present invention, FIG. 2 is a rear view of the recording head with the diaphragm removed, and FIG. 3 is a series of ink flow paths. It is the figure shown about.
[0007]
First, the laminated structure of the laminated recording head will be described. The nozzle plate 1 having a large number of nozzles 2 formed of stainless steel having corrosion resistance is formed on the back surface by a thin plate of stainless steel. The spacer 4, that is, the first thin plate material is integrally laminated with the adhesive 3.
[0008]
A reservoir chamber 5 communicating with an ink supply tank (not shown) is formed in the spacer 4 along the arrangement direction of the nozzles 2, and the nozzle 2 is disposed at a position larger than the diameter of the nozzle 2. One through-hole 6 is formed.
[0009]
An ink supply plate 8, which is also made of stainless steel, that is, a second thin plate material, is attached to the back surface of the spacer 4 with an adhesive 7. The orifice 9 communicates with the reservoir chamber 5, and the first A second through hole 10 communicating with the through hole 6 is formed.
[0010]
On the other hand, the reinforcing plate 12 attached to the back surface of the ink supply plate 8 with the adhesive 11, that is, the third thin plate material, is a pressure chamber plate 16 stacked on the back surface, that is, the fourth thin plate material, and is made of zirconia or the like. The partition wall 18 that is integrally formed of the sintered material and partitions the pressure chambers 17 of the pressure chamber plate 16 is prevented from being deformed outward by the bending deformation of the piezoelectric vibrator 20 in the width direction. Functions are granted.
[0011]
The reinforcing plate 12 is formed with an ink supply hole 13 that connects the orifice 9 and the pressure chamber 17, and a third through hole 14 that connects the pressure chamber 17 and the second through hole 10, and the pressure chamber plate 16 is formed with a pressure chamber 17 having such a size that an ink droplet having a required particle diameter can be ejected from the amount of displacement of the piezoelectric vibrator 20. One end of the pressure chamber 17 is connected to the ink supply hole 13. The end communicates with the third through hole 14 that reaches the nozzle 2.
[0012]
Further, a thin diaphragm 19 made of zirconia or the like having a high elastic modulus is integrally laminated on the back surface of the pressure chamber plate 16 so as to cover the pressure chamber 17, and the piezoelectric vibrator 20 is further disposed on the back surface. It is attached integrally.
[0013]
Next, the ink flow path configuration which forms the main part of the present invention will be described. The ink flow path from the pressure chamber 17 to the nozzle 2 is formed on the first through hole 6 on the spacer 4 and the ink supply plate 8. As shown in FIG. 3, the second through hole 10, the third through hole 14 on the reinforcing plate 12, and the nozzle tip 17 a of the pressure chamber 17 are positioned on the back side of the recording head main body. The ink is configured to draw a large arc so that the ink flows smoothly from the horizontal direction to the vertical direction from the pressure chamber 17 to the nozzle 2 on the front side.
[0014]
That is, the through holes 6, 10, 14 of the spacer 4, the ink supply plate 8, and the reinforcing plate 12 are formed as holes having substantially the same diameter, and the first through hole 6 is aligned with the axis of the nozzle 2. The axial center of the second through hole 10 is positioned closer to the reservoir chamber 5 than the axial center of the third through hole 14, and the nozzle side tip 17 a of the pressure chamber 17 is also the shaft of the third through hole 14. By shifting the position toward the reservoir chamber 5 side from the center, the through holes 14, 10 and 6 continuing to the pressure chamber 17 side are sequentially positioned outward from the nozzle side tip portion 17a of the pressure chamber 17. It is composed.
[0015]
Furthermore, in this embodiment, the axial center of the ink supply hole 13 provided in the reinforcing plate 12 is positioned so as to coincide with the axial center of the Ophiris 9, and the rear side of the pressure chamber 17 communicating with the ink supply hole 13 is on the orifice side. By shifting the end portion 17b to the nozzle side with respect to the axis of the ink supply hole 13, in other words, by shifting the ink supply hole 13 outward from the orifice-side tip portion 17b of the pressure chamber 17, the ink is supplied to the orifice. A gentle curve is drawn from 9 and flows into the pressure chamber 17.
[0016]
With this configuration, the flow of ink from the pressure chamber 17 to the nozzle 2 and the flow of ink from the orifice 9 to the pressure chamber 17 exhibit a gentle curve as shown by arrows in FIG. In addition, by removing ink stagnation as much as possible from the flow path during this period, bubbles mixed in the ink are discharged without staying in the flow path.
[0017]
FIG. 4 shows another embodiment of the present invention relating to a recording head laid out based on the ink flow path configuration described above.
[0018]
In this embodiment, the nozzle flow path unit 30 has the axial centers of the respective through holes 6, 10, and 14 communicating with the nozzle 2 shifted from the nozzle side tip of the pressure chamber 17 to the outside, and the adjacent nozzle flows. The nozzle 2 of the other nozzle channel unit 30 is alternately arranged between the nozzle 2 and the nozzle 2 of the passage unit 30 so as to be opposed to each other. Are arranged on the same line LL.
[0019]
In this embodiment, by positioning the through holes 6, 10, 14 on the outer side of the tip of the pressure chamber 17, between the arrangement pitch P of the nozzles 2 determined by the width W of the pressure chamber 17, The other nozzles 2 are positioned to increase the arrangement density twice.
[0020]
Further, FIG. 5, the pressure plate 16, i.e. without changing the arrangement of the pressure chambers 17 formed in the fourth thin plate, each nozzle of each of these pressure chambers 17 provided Ete strange position in the nozzle plate 1 2 shows an embodiment of the present invention that can be made to communicate with each other in accordance with FIG.
[0021]
That is, as shown in FIGS. 5 (a) and 5 (b), this only changes the positions of the through holes 6, 10, and 14 formed in the thin plate materials of the spacer 4, the supply plate 8 and the reinforcing plate 12. The pressure chambers 17 formed on the common pressure chamber plate 16 are configured to be able to communicate with the nozzles on the color image forming nozzle plate and the monochrome image forming nozzle plate which are disposed at different positions. Thus, the manufacturing cost is reduced.
[0022]
This is based on a line A-A connecting the center of the nozzle side tip 17 a of the pressure chamber 17 and the center of the nozzle 2 with the center of the through holes 6, 10, 14 formed in the thin plate members 4, 8, 12. Therefore, even if the nozzle is not positioned on the longitudinal axis of the pressure chamber, ink droplets can be ejected under certain conditions without causing ink stagnation.
[0023]
In each of the above-described embodiments, the through holes 6, 10, and 14 on the thin plate members 4, 8, and 12 have substantially the same diameter, but as shown in FIG. 10 and 14 can be formed to have a smaller diameter as they approach the nozzle 2, and by forming in this way, ink stagnation and bubble retention can be further reduced.
[0024]
【The invention's effect】
As described above, according to the present invention, each through hole formed in at least three thin plate members so as to connect the pressure chamber and the nozzle has an opening area that decreases in order from the pressure chamber to the nozzle. Since the center is located on the line connecting the chamber and the nozzle and the positions are shifted in order, the ink flow path from the pressure chamber to the nozzle is formed as a gentle curve that does not cause ink stagnation, and the ink flow is smooth Ink droplets can be kept in good condition for a long time while converging to prevent bubbles from being mixed into the ink, and each through-hole can be reliably secured even when they are slightly displaced in the surface direction when joining thin plates. It can be in a state where it is communicated with.
[0025]
In addition, since each through-hole is sequentially positioned on a line connecting the pressure chamber and the nozzle that is placed away from the longitudinal axis of the pressure chamber, for example, each nozzle for color image formation and monochrome image formation The recording head can be configured at low cost so as to communicate with each other, and the nozzle array density is eliminated by restricting the width of the pressure chamber by forming the two nozzle flow path units alternately at opposite positions. as possible to increase the doubling can be realized easily with high print quality image by easy single control mechanism.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a recording head showing an embodiment of the present invention.
FIG. 2 is a plan view of the recording head shown with the diaphragm removed.
FIG. 3 is a perspective view showing an ink through hole portion of the recording head.
FIG. 4 is a plan view showing another embodiment of the present invention.
FIGS. 5A and 5B are diagrams showing still another embodiment of the ink through hole portion. FIGS.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Nozzle plate 2 Nozzle 5 Reservoir chamber 6, 10, 14 Through-hole 9 Orifice 13 Ink supply hole 17 Pressure chamber 19 Diaphragm 20 Piezoelectric vibrator

Claims (2)

  1. An ink flow path from a pressure chamber having a substantially arc-shaped portion formed at an end portion on the nozzle side to a substantially circular nozzle located outside the region of the pressure chamber is provided in at least three thin plate members stacked on each other. In a recording head for an ink jet printer formed by continuous circular holes,
    The line hole of each substantially circular, are sequentially reduced in the opening area thereof is yuku to the nozzle from the pressure chamber, also the center, connecting the center of the nozzle with the center of the arcuate portion of the pressure chamber A recording head for an ink jet printer, which is arranged so that the positions are shifted in order so as to be positioned at each other .
  2. An ink flow path from the other pressure chamber having the same shape as the one pressure chamber to the other nozzle is formed and arranged opposite to the ink flow path from one pressure chamber to the one nozzle, 2. The recording for an ink jet printer according to claim 1, wherein the one nozzle constituting the ink flow path is alternately arranged so as to be positioned between the other nozzles constituting the other ink flow path. head.
JP35168793A 1993-12-28 1993-12-28 Recording head for inkjet printer Expired - Fee Related JP3623249B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP35168793A JP3623249B2 (en) 1993-12-28 1993-12-28 Recording head for inkjet printer

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
JP35168793A JP3623249B2 (en) 1993-12-28 1993-12-28 Recording head for inkjet printer
DE1994629021 DE69429021T2 (en) 1993-12-28 1994-12-28 Ink jet recording head
SG1996005415A SG64335A1 (en) 1993-12-28 1994-12-28 Ink jet recording head
EP19940120852 EP0661156B1 (en) 1993-12-28 1994-12-28 Ink jet recording head
EP97116382A EP0812692B1 (en) 1993-12-28 1994-12-28 Ink jet recording head
US08/365,160 US5880756A (en) 1993-12-28 1994-12-28 Ink jet recording head
DE1994623593 DE69423593T2 (en) 1993-12-28 1994-12-28 Ink jet recording head
US09/038,699 US6206501B1 (en) 1993-12-28 1998-03-09 Ink jet recording head
HK98104082A HK1004809A1 (en) 1993-12-28 1998-05-12 Ink jet recording head

Publications (2)

Publication Number Publication Date
JPH07195685A JPH07195685A (en) 1995-08-01
JP3623249B2 true JP3623249B2 (en) 2005-02-23

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ID=18418948

Family Applications (1)

Application Number Title Priority Date Filing Date
JP35168793A Expired - Fee Related JP3623249B2 (en) 1993-12-28 1993-12-28 Recording head for inkjet printer

Country Status (1)

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JP (1) JP3623249B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106113940A (en) * 2012-08-30 2016-11-16 京瓷株式会社 Fluid ejection head and use the recording equipment of this fluid ejection head

Families Citing this family (13)

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Publication number Priority date Publication date Assignee Title
JP2003261801A (en) 2002-03-08 2003-09-19 Brother Ind Ltd Aqueous ink and process for ink-jet recording
JP2004009475A (en) 2002-06-06 2004-01-15 Hitachi Printing Solutions Ltd Ink jet recording device and ink supply device used therein
JP4324757B2 (en) 2002-10-04 2009-09-02 ブラザー工業株式会社 Inkjet printer head
JP4710491B2 (en) * 2004-08-31 2011-06-29 ブラザー工業株式会社 Liquid transfer device
JP4662023B2 (en) * 2004-10-28 2011-03-30 ブラザー工業株式会社 Inkjet head
JP4770413B2 (en) 2005-03-04 2011-09-14 リコープリンティングシステムズ株式会社 Inkjet recording head
JP2007076168A (en) * 2005-09-14 2007-03-29 Fujifilm Corp Liquid ejection head and image forming device
JP4967704B2 (en) * 2006-03-01 2012-07-04 ブラザー工業株式会社 Method for manufacturing liquid droplet ejecting head
JP5962913B2 (en) * 2012-09-26 2016-08-03 セイコーエプソン株式会社 Liquid ejecting head and liquid ejecting apparatus
JP6114058B2 (en) * 2013-02-26 2017-04-12 京セラ株式会社 Flow path member for liquid discharge head, liquid discharge head using the same, and recording apparatus
JP5933145B1 (en) * 2015-02-24 2016-06-08 京セラ株式会社 Flow path member for liquid discharge head, and liquid discharge head and recording apparatus using the same
WO2016136005A1 (en) * 2015-02-24 2016-09-01 京セラ株式会社 Flow path member for liquid ejection head, and liquid ejection head and recording apparatus using same
JP6152915B2 (en) * 2016-06-27 2017-06-28 セイコーエプソン株式会社 Liquid ejecting head and liquid ejecting apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106113940A (en) * 2012-08-30 2016-11-16 京瓷株式会社 Fluid ejection head and use the recording equipment of this fluid ejection head

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