JPS6157345A - Ink jet recording device - Google Patents

Ink jet recording device

Info

Publication number
JPS6157345A
JPS6157345A JP17982084A JP17982084A JPS6157345A JP S6157345 A JPS6157345 A JP S6157345A JP 17982084 A JP17982084 A JP 17982084A JP 17982084 A JP17982084 A JP 17982084A JP S6157345 A JPS6157345 A JP S6157345A
Authority
JP
Japan
Prior art keywords
ink
groove
discharge port
discharge opening
air
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
JP17982084A
Other languages
Japanese (ja)
Inventor
Hajime Oda
小田　元
Kenji Akami
研二 赤見
Masayoshi Miura
眞芳 三浦
Hiroyuki Naito
宏之 内藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP17982084A priority Critical patent/JPS6157345A/en
Priority to US06/781,058 priority patent/US4728392A/en
Publication of JPS6157345A publication Critical patent/JPS6157345A/en
Priority to US07/074,305 priority patent/US4801954A/en
Priority to US07/074,306 priority patent/US4801955A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B41J2/16—Production of nozzles
    • B41J2/1606—Coating the nozzle area or the ink chamber
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/02—Air-assisted ejection

Abstract

PURPOSE:To prevent outflow of ink to the outside of a protrusion of a discharge opening and to stabilize recording properties, by a method wherein a nozzle plate on a part of the discharge opening of the ink is made into a protruded shape on a discharge side and a groove is provided on the circumference of the discharge opening of the ink on the top of the protruded shape. CONSTITUTION:A nozzle plate 3' on a part of a discharge opening 4 of ink is in a protruded shape and the circumference of the discharge opening 4 of the ink on the top of the protruded shape 12 is provided with a groove 11. The ink is formed into a conical state from the edge on the inside of the groove at the time of discharge. Even if the ink flows out of the discharge opening 4 through application of high voltage to the titled device and collapse of balance between ink pressure and air pressure, the ink is trapped into the groove 11, a discharge state of the ink is formed still into the conical state from the edge of the inside of the groove 11 and stable recording properties can be obtained. In addition to the above, as edged positions are increased due to a matter that the groove 11 is provided, far larger force is necessary for outflow of the ink and the ink becomes hard to flow out.

Description

【発明の詳細な説明】 産業上の利用分野 本発明はインクジェット記録装置に関する。[Detailed description of the invention] Industrial applications The present invention relates to an inkjet recording device.

従来例の構成とその問題点 インクジェット記録装置としては従来種々のものが提案
されている。Conventional Structures and Problems Various types of inkjet recording apparatuses have been proposed in the past.

第１図は本発明者らが先に出願した空気流の曲シによる
急激な圧力勾配の変化を利用したインクジェット記録装
置を示す。同図において、絶縁性のノズル板２には空気
吐出口１が穿孔されており、このノズル板２と平行して
ノズル板３が配置されておシ、かつノズル板３には空気
吐出口１に対向してインク吐出口４が取付けられている
。ノズル板２とノズル板３により形成される空気層７に
は周辺から空気流が送られ、空気吐出口１より流出する
。空気流の流れの方向は、空気吐出口１の近傍で急激に
変化しているため、インク吐出口４より空気吐出口１に
至る空間には急激な圧力勾配の印加されており、インク
ジェット記録装置の非駆動時にはインク吐出口４の近傍
の空気圧力とインク吐出口４内のインク圧力がほぼ等し
く、インク吐出口４内のインクのメニスカスが静止して
保たれるように調整される。FIG. 1 shows an inkjet recording apparatus that utilizes a sudden change in pressure gradient caused by a curved air flow, which the present inventors previously applied for. In the figure, an insulating nozzle plate 2 has air discharge ports 1 perforated therein, and a nozzle plate 3 is arranged parallel to this nozzle plate 2. An ink discharge port 4 is installed opposite to the ink discharge port 4 . An air flow is sent from the periphery to the air layer 7 formed by the nozzle plate 2 and the nozzle plate 3, and flows out from the air discharge port 1. Since the direction of the air flow changes rapidly near the air outlet 1, a sharp pressure gradient is applied to the space from the ink outlet 4 to the air outlet 1, causing the inkjet recording device to When the ink discharge port 4 is not driven, the air pressure near the ink discharge port 4 and the ink pressure within the ink discharge port 4 are approximately equal, and the ink meniscus within the ink discharge port 4 is adjusted to remain stationary.

信号源５はノズル板２の表面でかつ空気吐出口１の周辺
に設けられた電極８とインク吐出口Ａ内のインクとの間
に電位差が生じるように、電極８およびインク吐出口４
に連通した導電性のインク供給管６に電気的に接続され
ている。信号源５により電極８とインク吐出口４内のイ
ンクに電位差が生じると、この電位差による静電力によ
りインク吐出口４に生じるインクのメニスカスが空気吐
出口１の方向に引き伸ばされる。インク吐出口４から空
気吐出口１に至る空間には急激な圧力勾配の変化が生じ
ているため、前記インク吐出口４に生じるインクのメニ
スカスは一定長さ以上引き伸ばされると急激に加速され
空気吐出口１より飛翔する。The signal source 5 is connected to the electrode 8 and the ink discharge port 4 so that a potential difference is generated between the electrode 8 provided on the surface of the nozzle plate 2 and around the air discharge port 1 and the ink in the ink discharge port A.
It is electrically connected to a conductive ink supply pipe 6 that communicates with the ink supply pipe 6 . When a potential difference is generated between the electrode 8 and the ink in the ink discharge port 4 by the signal source 5, the meniscus of the ink generated in the ink discharge port 4 is stretched in the direction of the air discharge port 1 due to the electrostatic force caused by this potential difference. Since there is a rapid change in pressure gradient in the space from the ink discharge port 4 to the air discharge port 1, when the ink meniscus generated at the ink discharge port 4 is stretched beyond a certain length, it is rapidly accelerated and the air discharge Fly from exit 1.

第１図すに示すように、インク吐出口４を形成するノズ
ル板３は、そのインク吐出口４の部分で凸状に形成され
ている。凸状形状と空気流の関係からインク吐出口４の
近傍には死水域がある空間を作って広がっておシ、この
空間では、空気流の圧力勾配はほとんどない。このため
、インク吐出後のインクのメニスカスの彷元力の反動に
よってインクが噴出したり、機械的な振動が外部から伝
達されメニスカスが不安定になることによる記録不安定
の現象が少なくなる。凸状上面はインク吐出口４０部分
だけでなく全面がぬれた状態になっており、インク吐出
状態は第２図に示したようになる。第２図で第１図と同
一部分には同一符号を付す。凸状形状は、その上面部が
ぬれ易い特性にあり、このぬれによって、さらに応答性
の向上、画質の良化、インク吐出量の増加が図れる利点
を有する。As shown in FIG. 1, the nozzle plate 3 forming the ink discharge ports 4 is formed in a convex shape at the ink discharge ports 4. As shown in FIG. Due to the relationship between the convex shape and the airflow, a dead area is created in the vicinity of the ink ejection port 4, and in this space, there is almost no pressure gradient in the airflow. Therefore, the phenomenon of recording instability caused by ink being ejected due to the reaction of the rolling force of the ink meniscus after ink ejection or by mechanical vibration being transmitted from the outside and causing the meniscus to become unstable is reduced. The convex upper surface is wet not only at the ink discharge port 40 but also over the entire surface, and the ink discharge state is as shown in FIG. The same parts in FIG. 2 as in FIG. 1 are given the same reference numerals. The convex shape has the characteristic that the upper surface portion thereof is easily wetted, and this wettability has the advantage of further improving responsiveness, improving image quality, and increasing the amount of ink discharged.

しかしこのような優れた特性も凸状形状の上面のみがぬ
れた状態で生じるものであり、第３図ａに示したように
凸状形状の外側にわたってインクがおおうような状態あ
るいは、第３図すに示した空気層７内にインクが溜まっ
た状態では、応答性の低下、画質の劣化、インク吐出量
の減少、吐出不安定といった現象を招く。これらの状態
は、高電圧の印加、インク圧力と空気圧力のバランスの
崩れ、インク供給管の振動によるインク圧力変動、ヘッ
ドへの強い機械的振動等によってインク吐出口４のイン
クメニスカスが破れ、インクが流出することによって生
じる。これらの状態は通常生じ難いが、一旦生じると元
の状態へ復元する可能性がほとんどないためヘッドの洗
浄を余儀なく、される欠点を有していた。However, these excellent characteristics occur only when only the top surface of the convex shape is wet, and if the ink covers the outside of the convex shape as shown in Figure 3a, or When ink accumulates in the air layer 7 shown in FIG. 2, phenomena such as a decrease in responsiveness, deterioration of image quality, a decrease in the amount of ink ejection, and unstable ejection occur. These conditions can occur when the ink meniscus of the ink ejection port 4 is torn due to the application of high voltage, an imbalance between ink pressure and air pressure, fluctuations in ink pressure due to vibrations in the ink supply tube, strong mechanical vibrations to the head, etc. This is caused by the outflow of water. Although these conditions usually do not occur easily, once they occur, there is almost no possibility of restoring the head to its original state, which has the disadvantage that the head must be cleaned.

発明の目的 本発明は上記問題点を解決するもので、インク吐出口の
凸状部の外側へのインク流出を生じ難くし、記録特性の
安定性の向上を図ることを目的としたものである。Purpose of the Invention The present invention is intended to solve the above-mentioned problems, and is aimed at making it difficult for ink to flow out to the outside of the convex portion of the ink ejection port and improving the stability of recording characteristics. .

発明の構成 本発明は、インク吐出口の部分のノズル板をインク吐出
側に凸状形状とし、凸状形状の上面のインク吐出口周囲
に溝を設けた構造を有するインクジェット記録装置であ
る。Structure of the Invention The present invention is an inkjet recording apparatus having a structure in which a nozzle plate at an ink ejection port portion has a convex shape toward the ink ejection side, and a groove is provided around the ink ejection port on the upper surface of the convex shape.

実施例の説明 以下本発明の実施例を詳細に説明する０第４図ａ、ｂは
、本発明の実施例のひとつでインク吐出口部分の正面図
及び側面図を示しだものである。インク吐出口４の部分
のノズル板３′は凸状形状１２をしており凸状形状１２
上面のインク吐出口４の周囲には溝１１が設けられてい
る。DESCRIPTION OF EMBODIMENTS Embodiments of the present invention will now be described in detail. FIGS. 4a and 4b show a front view and a side view of an ink discharge port portion in one of the embodiments of the present invention. The nozzle plate 3' at the ink discharge port 4 has a convex shape 12;
A groove 11 is provided around the ink discharge port 4 on the top surface.

第５図は、第４図に示した実施例でのインク吐出口を有
するインクジェットヘッドのインク吐出状態を示した図
である。インクは、吐出時には、溝１１の内側のエツジ
よυ円錐状に形成される。FIG. 5 is a diagram showing the ink ejection state of the inkjet head having the ink ejection ports in the embodiment shown in FIG. 4. When the ink is ejected, the inner edge of the groove 11 forms a υ conical shape.

この蒔溝１１にはインクが存在していない。ここで、高
電圧の印加、インク圧力と空気圧力のバランスの崩れ、
インク供給管の振動によるインク圧力変動、ヘッドへの
強い機械的振動等によってインク吐出口４よりインクが
流出しても溝１１でトラップされ、インク吐出状態はや
はり溝１１の内側のエツジより円錐状に形成され安定し
た記録特性が得られる。さらにこの溝１１を設けること
によりエツジの箇所が増えるため、インクが流出するの
により大きな力の必要なことが確認されており、インク
が流出しにくくなっている。ここで溝１１の内側の凸部
と外側の凸部の高さが等しい必要はない。No ink exists in this sowing groove 11. Here, application of high voltage, imbalance between ink pressure and air pressure,
Even if ink flows out from the ink discharge port 4 due to ink pressure fluctuation due to vibration of the ink supply pipe, strong mechanical vibration to the head, etc., it will be trapped in the groove 11, and the ink discharge state will still be conical from the inner edge of the groove 11. This allows stable recording characteristics to be obtained. Furthermore, it has been confirmed that the provision of this groove 11 increases the number of edges, which requires greater force for the ink to flow out, making it difficult for the ink to flow out. Here, it is not necessary that the inner and outer protrusions of the groove 11 have the same height.

今、第５図に示した実施例では、溝１１の数はひとつで
あるが、２重、３重にすることにより、より大きな効果
が得られる。また溝の形状もテーパがついたシ底部でＲ
がついたり、半円形状でも良く第４図、第５図に示した
ものに限定されない。In the embodiment shown in FIG. 5, the number of grooves 11 is one, but a greater effect can be obtained by using two or three grooves. Also, the shape of the groove is rounded at the bottom with a taper.
It is not limited to what is shown in FIGS. 4 and 5, and may have a semi-circular shape.

本発明のインク吐出口部分の形成は、エツチング技術に
より、容易に製造することが可能である。The ink discharge port portion of the present invention can be easily formed by etching technology.

発明の効果 以上のように本発明はインク吐出口部分のノズル板を凸
状形状にし凸状形状上面のインク吐出口の周囲に溝を設
けたことを特徴とするインクジェット記録装置であり次
のような効果を有する。Effects of the Invention As described above, the present invention is an inkjet recording device characterized in that the nozzle plate at the ink ejection port portion has a convex shape and a groove is provided around the ink ejection port on the upper surface of the convex shape. It has a great effect.

（１）インク吐出口よりのインクの流出を生じ難′くす
る。(1) Make it difficult for ink to flow out from the ink ejection port.

（２）インクの流出が生じても溝でトラップでき、それ
以上の流出を防ぐ。(2) Even if ink leaks, it can be trapped in the grooves and further leakage can be prevented.

以上の効果のため、安定した高記録特性が得られ信頼性
が著しく向上した。Due to the above effects, stable high recording characteristics were obtained and reliability was significantly improved.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図ａは、本出願人が先行出願したインクジェット記
録装置の断面図、第１図すは第１図ａのインク吐出口部
分の拡大断面図、第２図は第１図に示したインクジェッ
ト記録装置における通常でのインク吐出状態を示す断面
図、第３図ａ、ｂは、第１図に示したインクジェット記
録装置のインク吐出口よりインクが流出した状態を示す
断面側面図、第４図ａ、ｂは、本発明のインクジェット
記録装置におけるインク吐出口部分の平面図および側面
図、第５図は本発明のインクジェット記録装置における
インク吐出状態を示す断面側面図である０ １・・・・・・空気吐出口、２・・・・・・ノズル板、
３，３′・・・・・・ノズル板、４・・・・・・インク
吐出口、５・・・・・・信号源く６・・・・・・インク
供給管、７・・・・・・空気層、８・・・・・・電極、
９・・・・・・インク、１０・・・・・・インク液滴、
１１・・・・・・溝、１２・・・・・・凸状部。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名第１
図 第２図 第３図 第４図 （α）（ｂ） 第５図FIG. 1a is a cross-sectional view of an inkjet recording device for which the present applicant has previously filed an application, FIG. 1 is an enlarged cross-sectional view of the ink ejection port portion of FIG. FIGS. 3a and 3b are cross-sectional views showing the normal ink ejection state of the recording apparatus, and FIG. a and b are a plan view and a side view of an ink ejection port portion in an inkjet recording apparatus of the present invention, and FIG. 5 is a cross-sectional side view showing an ink ejection state in the inkjet recording apparatus of the present invention. ...Air discharge port, 2...Nozzle plate,
3, 3'...Nozzle plate, 4...Ink discharge port, 5...Signal source 6...Ink supply pipe, 7... ...air layer, 8...electrode,
9... Ink, 10... Ink droplet,
11... Groove, 12... Convex portion. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 (α) (b) Figure 5

Claims (1)

【特許請求の範囲】[Claims] 空気流を空気吐出口より急激な曲りを生じさせて噴出さ
せる手段と、前記空気流の曲りにより生じる圧力勾配を
有する空間内に前記空気吐出口に対向して配されたイン
ク吐出口とを設け、前記インク吐出口部分が前記空気吐
出口方向に延びる凸状形状をなし、凸状形状の上面の前
記インク吐出口の周囲に少なくともひとつの溝を設け、
電界力により前記インク吐出口よりインクを引き出し、
空気流に乗せて前記空気吐出口より飛翔させ記録を行な
うインクジェット記録装置。A means for ejecting an air stream with a sharp bend from the air outlet, and an ink outlet disposed opposite to the air outlet in a space having a pressure gradient caused by the bend of the air stream. , the ink discharge port portion has a convex shape extending in the direction of the air discharge port, and at least one groove is provided around the ink discharge port on the upper surface of the convex shape;
drawing out ink from the ink ejection port by electric field force;
An inkjet recording device that performs recording by ejecting ink on an air stream from the air outlet.
JP17982084A 1984-04-20 1984-08-29 Ink jet recording device Pending JPS6157345A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP17982084A JPS6157345A (en) 1984-08-29 1984-08-29 Ink jet recording device
US06/781,058 US4728392A (en) 1984-04-20 1985-09-27 Ink jet printer and method for fabricating a nozzle member
US07/074,305 US4801954A (en) 1984-04-20 1987-07-15 Ink jet printer
US07/074,306 US4801955A (en) 1984-04-20 1987-07-15 Ink jet printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17982084A JPS6157345A (en) 1984-08-29 1984-08-29 Ink jet recording device

Publications (1)

Publication Number Publication Date
JPS6157345A true JPS6157345A (en) 1986-03-24

Family

ID=16072458

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17982084A Pending JPS6157345A (en) 1984-04-20 1984-08-29 Ink jet recording device

Country Status (1)

Country Link
JP (1) JPS6157345A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5924751A (en) * 1982-08-02 1984-02-08 Toray Ind Inc Polyamide resin composition
EP1138499A3 (en) * 2000-03-21 2002-01-30 Nec Corporation Nozzle plate structure for ink-jet printing head and method of manufacturing nozzle plate
EP1666258A3 (en) * 2004-12-01 2006-09-27 Fuji Photo Film Co., Ltd. Repellency increasing structure and method of producing the same, liquid ejection head and method of producing the same, and stain-resistant film
JP2009149102A (en) * 1998-10-16 2009-07-09 Silverbrook Research Pty Ltd Inkjet print head with ink flow control structure
US7815291B2 (en) 1998-10-16 2010-10-19 Silverbrook Research Pty Ltd Printhead integrated circuit with low drive transistor to nozzle area ratio
US7874644B2 (en) 1998-10-16 2011-01-25 Silverbrook Research Pty Ltd Inkjet printhead with shared ink spread restriction walls
US7896468B2 (en) 1998-10-16 2011-03-01 Silverbrook Research Pty Ltd Ink ejection nozzle arrangement
US7905588B2 (en) 1998-10-16 2011-03-15 Silverbrook Research Pty Ltd Camera printhead assembly with baffles to retard ink acceleration
US7918541B2 (en) 1998-10-16 2011-04-05 Silverbrook Research Pty Ltd Micro-electromechanical integrated circuit device with laminated actuators
US7931351B2 (en) 1998-10-16 2011-04-26 Silverbrook Research Pty Ltd Inkjet printhead and printhead nozzle arrangement
US7934799B2 (en) 1998-10-16 2011-05-03 Silverbrook Research Pty Ltd Inkjet printer with low drop volume printhead
US8011757B2 (en) 1998-10-16 2011-09-06 Silverbrook Research Pty Ltd Inkjet printhead with interleaved drive transistors
US8336990B2 (en) 1998-10-16 2012-12-25 Zamtec Limited Ink supply unit for printhead of inkjet printer

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5924751A (en) * 1982-08-02 1984-02-08 Toray Ind Inc Polyamide resin composition
US7918540B2 (en) 1998-10-16 2011-04-05 Silverbrook Research Pty Ltd Microelectromechanical ink jet printhead with printhead temperature feedback
US7815291B2 (en) 1998-10-16 2010-10-19 Silverbrook Research Pty Ltd Printhead integrated circuit with low drive transistor to nozzle area ratio
US7931351B2 (en) 1998-10-16 2011-04-26 Silverbrook Research Pty Ltd Inkjet printhead and printhead nozzle arrangement
US8336990B2 (en) 1998-10-16 2012-12-25 Zamtec Limited Ink supply unit for printhead of inkjet printer
US7934799B2 (en) 1998-10-16 2011-05-03 Silverbrook Research Pty Ltd Inkjet printer with low drop volume printhead
US7874644B2 (en) 1998-10-16 2011-01-25 Silverbrook Research Pty Ltd Inkjet printhead with shared ink spread restriction walls
US7896473B2 (en) 1998-10-16 2011-03-01 Silverbrook Research Pty Ltd Low pressure nozzle for an inkjet printer
US7938524B2 (en) 1998-10-16 2011-05-10 Silverbrook Research Pty Ltd Ink supply unit for ink jet printer
US7901023B2 (en) 1998-10-16 2011-03-08 Silverbrook Research Pty Ltd Inkjet printhead with drive circuitry controlling variable firing sequences
US7905588B2 (en) 1998-10-16 2011-03-15 Silverbrook Research Pty Ltd Camera printhead assembly with baffles to retard ink acceleration
US7918541B2 (en) 1998-10-16 2011-04-05 Silverbrook Research Pty Ltd Micro-electromechanical integrated circuit device with laminated actuators
US8025355B2 (en) 1998-10-16 2011-09-27 Silverbrook Research Pty Ltd Printer system for providing pre-heat signal to printhead
JP2009149102A (en) * 1998-10-16 2009-07-09 Silverbrook Research Pty Ltd Inkjet print head with ink flow control structure
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