JPS63303750A - Ink jet head - Google Patents

Ink jet head

Info

Publication number
JPS63303750A
JPS63303750A JP14046687A JP14046687A JPS63303750A JP S63303750 A JPS63303750 A JP S63303750A JP 14046687 A JP14046687 A JP 14046687A JP 14046687 A JP14046687 A JP 14046687A JP S63303750 A JPS63303750 A JP S63303750A
Authority
JP
Japan
Prior art keywords
valvular
nozzle
ink
nozzle holes
valve means
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
JP14046687A
Other languages
Japanese (ja)
Inventor
Hiromichi Komai
博道 駒井
Tatsuya Furukawa
達也 古川
Takuro Sekiya
卓朗 関谷
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP14046687A priority Critical patent/JPS63303750A/en
Publication of JPS63303750A publication Critical patent/JPS63303750A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, 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
    • B41J2/015Ink jet characterised by the jet generation process
    • B41J2/02Ink jet characterised by the jet generation process generating a continuous ink jet
    • B41J2/03Ink jet characterised by the jet generation process generating a continuous ink jet by pressure

Abstract

PURPOSE:To form a valvular part capable of improved sealing property and responsive velocity by providing a valvular means of a nozzle consisting of a laminated piezoelectric ceramics which blocks nozzle holes when one fixed end of the valvular means expands, and a sealing member which is installed at the free end of said means and hermetically seals the nozzle holes. CONSTITUTION:A valvular means 10 has a constantly set application voltage and expands to an arrow direction prior to the operation to set a pump ON and a valve OFF. Then one end of the valvular means 10 expands to a nozzle direction because one end of the valvular means 10 is fixed to a keep plate 20, and the nozzle holes 51 are set to a closed state by means of a sealing member at the free end. At that time, a laminated piozoelectric ceramics can obtain a significant displacement at a small application voltage. Next, the valvular means 10 contracts to a vertical direction by setting the pump ON and the valve OFF, and further overlapping pulse voltage to the constant application voltage. Subsequently, the free end at the tip of the valvular means separates from the nozzle holes, and ink is sent flying from the nozzle holes 51 in the form of ink droplets under the ink pressure of an ink liquid chamber 70, for recording on paper.

Description

【発明の詳細な説明】 ■査圀互 本発明は、インクジェットヘッド、より詳細には、該イ
ンクジェットヘッドの弁手段に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inkjet head, and more particularly to a valve means of the inkjet head.

旦米鼓量 一般に、インクジェットヘッドにおいては、弁部のシー
ル性に問題があり、該弁部のシール性を良くするために
、弁部の圧着力を強くすると、弁部の機械的応答速度が
極端に低下する欠点があった。また、弁部は電気−機械
変換手段が用いられるが、膨大な印加電圧を必要とする
不都合があった。
In general, inkjet heads have problems with the sealing performance of the valve part, and in order to improve the sealing performance of the valve part, increasing the pressure of the valve part will reduce the mechanical response speed of the valve part. It had the drawback of being extremely poor. Further, although an electro-mechanical conversion means is used for the valve portion, it has the disadvantage of requiring a huge amount of applied voltage.

■−一」狂 本発明は、上述のごとき実情に鑑みてなされたもので、
インクジェットヘッドにおいて、シール性が良く、かつ
、応答速度の良い弁部を提供することを目的としてなさ
れたものである。
■-1 This invention was made in view of the above-mentioned circumstances.
This was done for the purpose of providing a valve part with good sealing performance and high response speed in an inkjet head.

璽−一犬 本発明は、上記目的を達成するために、ノズル孔と、伸
縮自在で、伸びた状態でノズル孔を閉塞し、縮んだ状態
でノズル孔を開く弁手段と、該弁手段を電気信号に応じ
て伸縮させる弁手段制御手段と、弁手段の縮んだ状態の
とき前記ノズル孔に連通ずるインク流路とを有するイン
クジェットヘッドにおいて、前記弁手段は、一端が固定
されて伸張時前記ノズル孔を閉塞する方向に変位する積
層圧電セラミックスと、該圧電セラミックスの自由端側
に配設されて前記ノズル孔を密閉するシール材とから成
ることを特徴としたものである。以下、本発明の実施例
に基づいて説明する。
In order to achieve the above object, the present invention comprises a nozzle hole, a telescopic valve means that closes the nozzle hole in an extended state and opens the nozzle hole in a contracted state, and the valve means. In the inkjet head, the valve means has a valve means control means that expands and contracts in response to an electric signal, and an ink flow path that communicates with the nozzle hole when the valve means is in a retracted state. This device is characterized by comprising a laminated piezoelectric ceramic that is displaced in a direction to close the nozzle hole, and a sealing material that is disposed on the free end side of the piezoelectric ceramic and seals the nozzle hole. Hereinafter, the present invention will be explained based on examples.

第1図は、本発明によるインクジェットヘッドの一実施
例を説明するための断面構成図、第2図は、ノズルプレ
ートの平面図で、図中、10は弁手段で、該弁手段は、
積層圧電セラミックス11、結合材12およびゴム又は
プラスチックスよりなるシール材13からなり、前記積
層圧電セラミックス11と前記結合材12を接着等によ
り結合後、端面を平滑に研摩し、前記シール材13を接
着することにより構成される。前記弁手段10は、その
一端が押え板20に接着等の手段による接合され、ハウ
ジング30内に保持材(シリコンゴム等)40にて保持
固定され、他端の自由端は、前記弁手段10に対応して
設けられたノズルプレート50のノズル孔51に当接し
ている。前記ノズルプレート50はガラス上板50aに
溝53を加工後、溝部53にガラスチューブ又はファイ
バガラス54を接合後、ガラス下板50bを接合し、ガ
ラスチューブ又はファイバガラスのコア部をエツチング
除去し、更にガラス表面をラッピング等で研摩仕上げし
たものが用いられる。60はノズルプレート保護材で、
前記ノズルプレート50のノズル孔51に対応する開孔
部61を有し、前記ガラス製ノズルプレート50(板厚
約100μm)が弁手段10の圧力により変形するのを
防止している。尚、ノズルプレート保護林60としては
、ステンレスプレート(板厚約1■)にエツチング穴加
工したものが適している。70はインク液室、71はイ
ンク流入口、72はインク排出口で、これらのインク流
路は前記弁部材10が縮んだ状態の時、前記ノズル孔5
1に連通する。80および90は前記インク液室70へ
のインクの圧送を制御するポンプおよびバルブである。
FIG. 1 is a cross-sectional configuration diagram for explaining one embodiment of an inkjet head according to the present invention, and FIG. 2 is a plan view of a nozzle plate. In the figure, 10 is a valve means, and the valve means is
Consisting of a laminated piezoelectric ceramic 11, a binding material 12, and a sealing material 13 made of rubber or plastic, after the laminated piezoelectric ceramic 11 and the binding material 12 are bonded together by adhesive or the like, the end surface is polished smooth and the sealing material 13 is bonded. Constructed by gluing. One end of the valve means 10 is joined to the presser plate 20 by means of adhesive or the like, and is held and fixed in the housing 30 with a holding material (such as silicone rubber) 40, and the other free end is joined to the presser plate 20 by adhesive or other means. The nozzle hole 51 of the nozzle plate 50 is provided correspondingly to the nozzle hole 51 of the nozzle plate 50. The nozzle plate 50 is made by forming a groove 53 on a glass upper plate 50a, bonding a glass tube or fiberglass 54 to the groove 53, bonding a glass lower plate 50b, and removing the core portion of the glass tube or fiberglass by etching. Furthermore, those whose glass surfaces have been polished by lapping or the like are used. 60 is the nozzle plate protection material,
It has openings 61 corresponding to the nozzle holes 51 of the nozzle plate 50 to prevent the glass nozzle plate 50 (thickness of about 100 μm) from being deformed by the pressure of the valve means 10. As the nozzle plate protection forest 60, a stainless steel plate (approximately 1 inch in thickness) with etched holes is suitable. 70 is an ink liquid chamber, 71 is an ink inlet, and 72 is an ink outlet. These ink flow paths are connected to the nozzle hole 5 when the valve member 10 is in the contracted state.
Connects to 1. 80 and 90 are pumps and valves that control the pressure feeding of ink to the ink liquid chamber 70.

第3図は、インク液室70へのインクの圧送を制御する
ポンプ80および90の制御と、弁手段10の0N10
FFによる印字のシーケンスを説明するための図で、(
a)図はポンプのON。
FIG. 3 shows the control of pumps 80 and 90 that control the pressure feeding of ink to the ink liquid chamber 70, and the 0N10 of the valve means 10.
This is a diagram to explain the printing sequence by FF.
a) The figure shows the pump turned on.

OFF、(b)図はバルブのON、OFF、(c)図は
圧電セラミックス(弁手段)への電圧のON。
OFF, (b) the valve is ON and OFF, (c) the voltage to the piezoelectric ceramic (valve means) is ON.

OFFを示し、ポンプON、バルブOFFに先立って弁
手段10は一定の印加電圧v0を受け、第1図の矢印方
向に伸びる。しかしながら、弁手段10の一端は、前記
押え板20に固定されているので、該弁手段10は全体
としてノズル方向に伸び、弁手段1oの先端のシール材
13によりノズル孔51が閉状態となる。この時、積層
圧電セラミックス11は少ない印加電圧V、で大きい変
位(20〜50μ園)を得ることが可能である6次に、
ポンプON、バルブOFFとし、さらに、一定の印加電
圧V−こ対して、viのパルス電圧(第3図(C))を
重畳することにより、弁手段10は垂直方向に縮み、そ
の先端の自由端がノズル孔から離れ、インク液室70内
のインク圧力によりインクはインク液室70内のインク
圧力によりインクはノズル51よりインク滴として飛翔
し紙上に記録される。ポンプ80の電圧がOFFに、バ
ルブ90の電圧がONになると、インク液室70中のイ
ンク圧力は大気圧へ開放され、印字が停止する。
OFF, and before the pump is turned on and the valve is turned off, the valve means 10 receives a constant applied voltage v0 and extends in the direction of the arrow in FIG. However, since one end of the valve means 10 is fixed to the presser plate 20, the valve means 10 as a whole extends in the nozzle direction, and the nozzle hole 51 is closed by the sealing material 13 at the tip of the valve means 1o. . At this time, the laminated piezoelectric ceramic 11 can obtain a large displacement (20 to 50 μm) with a small applied voltage V.
By turning the pump ON and the valve OFF, and further superimposing a pulse voltage vi (FIG. 3(C)) on a constant applied voltage V-, the valve means 10 contracts in the vertical direction, freeing its tip. The end is separated from the nozzle hole, and due to the ink pressure in the ink liquid chamber 70, the ink is ejected as an ink droplet from the nozzle 51 and recorded on the paper. When the voltage of the pump 80 is turned OFF and the voltage of the valve 90 is turned ON, the ink pressure in the ink liquid chamber 70 is released to atmospheric pressure, and printing stops.

その後、弁手段10への印加電圧V、をOにすれば前記
弁手段10は元の状態に復帰する。
Thereafter, when the voltage V applied to the valve means 10 is set to O, the valve means 10 returns to its original state.

皇−一員 以上の説明から明らかなように、本発明によると、弁手
段に積層圧電セラミックスを用いたので、少ない印加電
圧で大きい変位を得ることができ、弁部のシール性およ
び機械的応答速度が向上する利点がある。
As is clear from the above explanation, according to the present invention, since laminated piezoelectric ceramics are used for the valve means, a large displacement can be obtained with a small applied voltage, and the sealing performance and mechanical response speed of the valve part are improved. This has the advantage of improving

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

第1図は、本発明によるインクジェット記録装置の一実
施例を説明するための断面構成図、第2図は、ノズルプ
レート作成時の正面図、第3図は、第1図に示した実施
例の制御回路のタイミングチャートである。 10・・・弁手段、11・・・積層圧電セラミックス、
12・・・結合材、13・・・シール材、20・・・押
え板、30・・・ハウジング、40・・・保持材、50
・・・ノズルプレート、51・・・ノズル孔、60・・
・ノズルプレート保護材、61・・・開孔部、70・・
・インク液室、71・・・インク流入口、72・・・イ
ンク排出口、8゜・・・ポンプ、90・・・バルブ。 特許出願人  株式会社 リコー 第1図 第2図 第  3 図
FIG. 1 is a cross-sectional configuration diagram for explaining one embodiment of an inkjet recording apparatus according to the present invention, FIG. 2 is a front view when a nozzle plate is prepared, and FIG. 3 is an embodiment shown in FIG. 1. 2 is a timing chart of the control circuit of FIG. 10... Valve means, 11... Laminated piezoelectric ceramics,
12... Binding material, 13... Sealing material, 20... Pressing plate, 30... Housing, 40... Holding material, 50
... Nozzle plate, 51... Nozzle hole, 60...
・Nozzle plate protection material, 61...opening part, 70...
- Ink liquid chamber, 71... Ink inlet, 72... Ink outlet, 8°... Pump, 90... Valve. Patent applicant Ricoh Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

【特許請求の範囲】[Claims] ノズル孔と、伸縮自在で、伸びた状態でノズル孔を閉塞
し、縮んだ状態でノズル孔を開く弁手段と、該弁手段を
電気信号に応じて伸縮させる弁手段制御手段と、弁手段
の縮んだ状態のとき前記ノズル孔に連通するインク流路
とを有するインクジェットヘッドにおいて、前記弁手段
は、一端が固定されて伸張時前記ノズル孔を閉塞する方
向に変位する積層圧電セラミックスと、該電圧セラミッ
クスの自由端側に配設されて前記ノズル孔を密閉するシ
ール材とから成ることを特徴とするインクジェットヘッ
ド。
a nozzle hole, a telescopic valve means that closes the nozzle hole in an extended state and opens the nozzle hole in a contracted state, a valve means control means for expanding and contracting the valve means in response to an electric signal; In an inkjet head having an ink flow path communicating with the nozzle hole when in a contracted state, the valve means includes a laminated piezoelectric ceramic whose one end is fixed and which is displaced in a direction to close the nozzle hole when expanded; An inkjet head comprising: a sealing material disposed on a free end side of ceramic to seal the nozzle hole.
JP14046687A 1987-06-03 1987-06-03 Ink jet head Pending JPS63303750A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14046687A JPS63303750A (en) 1987-06-03 1987-06-03 Ink jet head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14046687A JPS63303750A (en) 1987-06-03 1987-06-03 Ink jet head

Publications (1)

Publication Number Publication Date
JPS63303750A true JPS63303750A (en) 1988-12-12

Family

ID=15269252

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14046687A Pending JPS63303750A (en) 1987-06-03 1987-06-03 Ink jet head

Country Status (1)

Country Link
JP (1) JPS63303750A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5600357A (en) * 1990-02-23 1997-02-04 Seiko Epson Corporation Drop-on-demand ink-jet printing head
WO1997006008A1 (en) * 1995-08-05 1997-02-20 Rea Elektronik Gmbh Ink jet writing head
US6186619B1 (en) 1990-02-23 2001-02-13 Seiko Epson Corporation Drop-on-demand ink-jet printing head
WO2015110179A1 (en) * 2014-01-27 2015-07-30 Hewlett-Packard Indigo B.V. Valve

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5600357A (en) * 1990-02-23 1997-02-04 Seiko Epson Corporation Drop-on-demand ink-jet printing head
US5894317A (en) * 1990-02-23 1999-04-13 Seiko Epson Corporation Drop-on-demand ink-jet printing head
US5910809A (en) * 1990-02-23 1999-06-08 Seiko Epson Corporation Drop-on-demand ink-jet printing head
US6186619B1 (en) 1990-02-23 2001-02-13 Seiko Epson Corporation Drop-on-demand ink-jet printing head
US6742875B2 (en) 1990-02-23 2004-06-01 Seiko Epson Corp Drop-on-demand ink-jet printing head
US6942322B2 (en) 1990-02-23 2005-09-13 Seiko Epson Corporation Drop-on-demand ink-jet printing head
WO1997006008A1 (en) * 1995-08-05 1997-02-20 Rea Elektronik Gmbh Ink jet writing head
WO2015110179A1 (en) * 2014-01-27 2015-07-30 Hewlett-Packard Indigo B.V. Valve
JP2017510478A (en) * 2014-01-27 2017-04-13 ヒューレット−パッカード・インデイゴ・ビー・ブイHewlett−Packard Indigo B.V. valve
US9878556B2 (en) 2014-01-27 2018-01-30 Hp Indigo B.V. Valve
US10357978B2 (en) 2014-01-27 2019-07-23 Hp Indigo B.V. Valve

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