JPH03159748A - Ink jet recording head - Google Patents

Ink jet recording head

Info

Publication number
JPH03159748A
JPH03159748A JP30023689A JP30023689A JPH03159748A JP H03159748 A JPH03159748 A JP H03159748A JP 30023689 A JP30023689 A JP 30023689A JP 30023689 A JP30023689 A JP 30023689A JP H03159748 A JPH03159748 A JP H03159748A
Authority
JP
Japan
Prior art keywords
ink
movable valve
ink drop
discharge opening
drop discharge
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
JP30023689A
Other languages
Japanese (ja)
Inventor
Hiroaki Izu
博昭 伊豆
Tatsuya Hirose
達也 廣瀬
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP30023689A priority Critical patent/JPH03159748A/en
Publication of JPH03159748A publication Critical patent/JPH03159748A/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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/05—Heads having a valve

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

PURPOSE:To prevent inadequate discharge of an ink drop from generating by making corrosive conductive component and parts unnecessary by a method wherein a movable valve is provided which makes an ink drop discharge from an ink drop discharge opening by operating from an open state to a close state, and which is positioned in an ink passage of the ink drop discharge opening to perform opening and closing of the ink drop discharge opening. CONSTITUTION:An ink passage 5 is filled by ink pressurized with an ink supply system 8 under a state wherein a movable valve 6 closes an ink drop discharge opening 4. By applying tens to hundreds voltage V between an electrode 7 and the movable valve 6 under said state, polarization is generated to the movable valve 6, and the movable valve 6 is attracted in an direction of the electrode 7. The ink drop discharge opening 4 is opened, and the pressurized ink is pushed out from the ink drop discharge opening 4. Thereafter, when electrification is stopped, the ink drop discharge opening 4 is closed, and an ink drop 6 is discharged from the ink drop discharge opening 4 by pressurizing force given to the ink and the pushing force when the movable valve 6 is closed.

Description

【発明の詳細な説明】 （イ）産業上の利用分野 本発明は、インクを記録媒体（例えば、紙）に吐出する
インクジェット記録ヘッドに関するものである。DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an inkjet recording head that ejects ink onto a recording medium (for example, paper).

（ロ）従来の技術 第２図！ａｌ乃至（ｃ）は、特開昭６２−１５６９６９
号公報に示された従来のインクジェット記録ヘッドの概
略図である。(b) Conventional technology Figure 2! al to (c) are JP-A-62-156969
1 is a schematic diagram of a conventional inkjet recording head shown in the publication.

（１ｌ）は、インク滴吐出口、（ｌ２）は、その一辺が
インク滴吐出口ｉｌｌ）の上辺に接着された．開門自在
の可動弁、（ｌ３）は、前記インク滴吐出口（ｌ１）に
連通ずるインク流路、（ｌ４）は、該インク流路（ｌ３
）に連通ずるインク室、（ｌ５）は、前記インク滴吐出
口（１１）から吐出されたインク滴、（１６）は，前記
インク流路｛１３｝内のインク滴吐出口（１１）近傍に
設けられた金属薄膜抵抗体等の電気熱変換体からなる吐
出エネルギ発生手段、（１７）は、インク室に連通ずる
インク供給系、（１８）は、インク流ｉ￥８（＋３＋内
に発生する気泡である。(1l) is an ink droplet ejection opening, and one side of (l2) is glued to the upper side of the ink droplet ejection opening (ill). A movable valve that can be opened freely, (l3) is an ink flow path communicating with the ink droplet ejection port (l1), and (l4) is an ink flow path that communicates with the ink droplet ejection port (l1).
), (l5) is an ink droplet ejected from the ink droplet ejection port (11), and (16) is an ink droplet ejected from the ink droplet ejection port (11) in the ink flow path {13}. Ejection energy generating means is provided with an electrothermal converter such as a metal thin film resistor, (17) is an ink supply system that communicates with the ink chamber, and (18) is an ink flow generated within the ink flow i\8 (+3+). It's a bubble.

前記構成において、インク流路（１３）及びインク室（
ｌ４）は、第２図（ａｌの如く、インク供給系（Ｉ７）
から供給されたインクで満たされている。この状態で、
吐出エネルギ発生手段（１６）を通電加熱することによ
り，インク中の吐出エネルギ発生手段（１６）上側に気
泡（１８）が生じる。この気泡（１８）による前記イン
ク流路（ｌ３）内の圧力上昇によって、気泡（１８）よ
り前方（第２図（ｂｌにおいて気泡（１８）の左側）の
インクの一部がインク滴吐出口（１１１から押し出され
、第２図（ｂｌの様になる。In the above configuration, the ink flow path (13) and the ink chamber (
l4) is the ink supply system (I7) as shown in Figure 2 (al).
filled with ink supplied by In this state,
By heating the ejection energy generating means (16) with electricity, bubbles (18) are generated in the ink above the ejection energy generating means (16). Due to the pressure increase in the ink flow path (l3) caused by this bubble (18), a part of the ink in front of the bubble (18) (on the left side of the bubble (18) in FIG. It is extruded from 111 and becomes as shown in Fig. 2 (bl).

その後、通電加熱を止めると、前記気泡（ｌ８）が収縮
し、インク流路（１３）内の圧力が降下する。その圧力
降下につれて可動弁（ｌ２）が閉じ、この可動弁（ｌ２
）は、インク滴吐出口（１１）外に押し出されたインク
をインク流路（ｌ３）内のインクから分離し、第２図（
Ｃ）の如くインク滴（ｌ５）が形成される。Thereafter, when the electrical heating is stopped, the bubbles (l8) contract and the pressure inside the ink flow path (13) drops. As the pressure drops, the movable valve (l2) closes, and this movable valve (l2) closes.
) separates the ink pushed out of the ink droplet ejection port (11) from the ink in the ink flow path (l3), and
Ink droplets (15) are formed as shown in C).

（ハ）　発明が解決しようとする課題 インク滴｛ｌ５｝を吐出させる為の吐出エネルギ発生手
段（ｌ６）は、インク流路（１３）内下面に設けられ、
インク流路（１３）がインクで満たされている状態では
、常時、インクと接触している。従って、吐出エネルギ
発生手段（ｌ６）である電気熱変換体等をインクの腐食
から防いだり、通電時における絶縁を行う為前記吐出エ
ネルギ発生手段（ｌ６）を被覆保護しなければならない
。(c) Problems to be Solved by the Invention The ejection energy generating means (l6) for ejecting the ink droplets {l5} is provided on the inner lower surface of the ink flow path (13),
When the ink channel (13) is filled with ink, it is always in contact with the ink. Therefore, the ejection energy generating means (l6) must be covered and protected in order to prevent the electrothermal converter, etc., which is the ejection energy generating means (l6), from being corroded by the ink and to insulate it when electricity is applied.

更に，吐出エネルギ発生手段（１６）によって発生させ
られた気泡（ｌ８）は、該吐出エネルギ発生手段（１６
）の通電加熱を止めると消えるが、インク滴吐出を幾度
か行なっていくと、消えるべき気泡（ｌ８）がインク流
路（１３）内に残留する。そして、残留気泡が，吐出さ
れるべきインク滴に代わって、インク滴吐出口（１１）
から吐出され、その結果インク滴｛１５｝の吐出不良が
生じる場合がある。Furthermore, the bubbles (l8) generated by the discharge energy generating means (16) are
) disappears when the electrical heating is stopped, but as the ink droplets are ejected several times, the bubbles (18) that should disappear remain in the ink flow path (13). Then, the remaining air bubbles replace the ink droplets to be ejected, and the ink droplet ejection opening (11)
As a result, ink droplet {15} may be ejected incorrectly.

（二）課題を解決するための手段 本発明であるインクジェット記録ヘッドは，インク滴吐
出口と、該インク滴吐出口に連通し、加圧インクが供給
されるインク流路と、前記インク滴吐出口の前記インク
流路内に位置し、前記インク滴吐出口の開閉を行うもの
であって、開状態から閉状態になることにより、前記イ
ンク滴吐出口からインク滴を吐出させる可動弁と、を備
えたことを特徴とする （ホ）　作用 本発明では、非インク滴吐出時、可動弁がインク滴吐出
口を閉状態として、インク供給系によって加圧されたイ
ンクがインク滴吐出口から吐出しないようにしている。(2) Means for Solving the Problems The inkjet recording head of the present invention has an ink droplet ejection opening, an ink flow path that communicates with the ink droplet ejection opening and is supplied with pressurized ink, and an ink droplet ejection opening. a movable valve that is located in the ink flow path at the outlet and opens and closes the ink droplet ejection port, and causes ink droplets to be ejected from the ink droplet ejection port by changing from an open state to a closed state; (e) Function: In the present invention, when ink droplets are not being ejected, the movable valve closes the ink droplet ejection ports, and the ink pressurized by the ink supply system is ejected from the ink droplet ejection ports. I try not to.

一方、インク滴吐出時、可動弁を閉状態から開状態にし
て、再び閉状態にするときの可動弁のインクに対する押
力及びインクに与えられた加圧力で、加圧インクをイン
ク滴吐出口からインク滴として吐出させる。On the other hand, when ejecting an ink droplet, the pressurized ink is transferred to the ink droplet ejection port by the pressing force applied to the ink by the movable valve when the movable valve is changed from the closed state to the open state and then closed again. The ink is ejected as ink droplets.

（へ）実施例 第１図は、本発明であるインクジェット記録ヘッドの概
略的断面図で、第１図（ａ）は、インク滴吐出口の閉状
態を表す図、第１図（ｂ）は、インク滴吐出口の開状態
を表す図及び第１図（ｃ）は、インク滴の吐出状態を表
す図である。(f) Example FIG. 1 is a schematic cross-sectional view of an inkjet recording head according to the present invention, FIG. 1(a) is a diagram showing the ink droplet ejection opening in a closed state, and FIG. , a diagram showing the open state of the ink droplet ejection port, and FIG. 1(c) are diagrams showing the ink droplet ejection state.

（１）は、周囲３辺に側壁を有する正方形薄板からなり
、その薄板のほぼ中央部にその薄板の側壁と同じ高さの
突起部分を有する第１部財、（２）は，前記第１部材（
１）と同じ大きさの薄板であって、第１部材（１）の中
央突起部分と対向する部分及び周囲部分を残して、それ
ら以外の部分に、厚さ数μｍの凹所が形或された第２部
材、（３）は、前記第１部材（１）と略同じ大きさの箱
形を成す第３部材である。そして、前記３部材（１１（
２＋（３）は、単結晶シリコンを部材とし、夫々異方性
エッチングで前記の形状になる様に作製される。なお、
第２部材（２）には適当な導電性を持たせるべく、不純
物が混入されている。(1) is a first part product consisting of a square thin plate with side walls on three sides, and has a protruding part approximately in the center of the thin plate with the same height as the side wall of the thin plate; Element(
It is a thin plate of the same size as 1), and a recess several μm thick is formed in the part other than the part facing the central protrusion part of the first member (1) and the surrounding part. The second member (3) is a box-shaped third member having approximately the same size as the first member (1). Then, the three members (11(
2+(3) is made of single-crystal silicon, and is manufactured into the above-mentioned shape by anisotropic etching. In addition,
Impurities are mixed into the second member (2) to give it appropriate conductivity.

第１部材（１）と第２部材（２）とは、第１部材（１）
の突起部分を持つ面と第２部材（２）の凹所を持つ面と
が対向する様に配置され、′Ｍ１部材＋１１の側壁部分
と第２部材（２）の周囲部分とが接着される。更に、第
３部材（３）は、第２部材（２）の凹所を持たない面を
覆うように第１図の如く接着されている． 第２部材（２）に挾まれて形成され、インク滴吐出口（
４）に連通ずるインク流路、（６）は、イン．ク滴吐出
口（４）と対向し、第２部材（２）の凹所に囲まれた部
分からなる可動弁，（７）は、第３部材（３）の前記可
動弁（６）と数十μｍの間隔をもって対向し、前記可動
弁（６）と同等の面積のＡ２蒸着からなる電極、（８）
は、第１部材（１）の（Ｉｌ！Ｉ壁を有しない辺でイン
ク流路（５）に接続し、インク流路（５）に加圧インク
を供給するべくポンプ等の加圧機構を有するインク供給
系、（９）は、インク滴吐出口（４）から吐出したイン
ク滴である。The first member (1) and the second member (2) are the first member (1)
The surface having the protruding portion and the surface having the recess of the second member (2) are arranged so as to face each other, and the side wall portion of the M1 member +11 and the surrounding portion of the second member (2) are bonded. . Furthermore, the third member (3) is bonded as shown in FIG. 1 so as to cover the surface of the second member (2) that does not have a recess. It is formed between the second member (2) and the ink droplet ejection opening (
(6) is an ink flow path communicating with the ink flow path (4); A movable valve (7) consisting of a portion facing the droplet discharge port (4) and surrounded by a recess of the second member (2) is similar to the movable valve (6) of the third member (3). (8) electrodes made of vapor-deposited A2 that face each other with an interval of 10 μm and have an area equivalent to that of the movable valve (6);
is connected to the ink flow path (5) at the side of the first member (1) that does not have the (Il!I wall), and a pressurizing mechanism such as a pump is connected to the ink flow path (5) to supply pressurized ink to the ink flow path (5). The ink supply system (9) includes ink droplets discharged from the ink droplet discharge port (4).

前記の構戒において、可動弁（６）がインク滴吐出口（
４）を閉じた状態において、インク流路（５）は、イン
ク供給系（８）で加圧されたインクによって、第ｌ図（
ａ）の如く満たされている。その状態で、図示しない電
圧源により、電極（７）と可動弁（６）間に数十〜数百
■の電圧をかけることによって、可動弁（６）に分極が
生じ、第１図（ｂ）の如く可動弁（６）が電極（７）の
方向に引き寄せられ、インク滴吐出口（４）が開き、イ
ンク滴吐出口（４）から加圧インクが押し出される。In the above configuration, the movable valve (6) is connected to the ink droplet ejection port (
4) is closed, the ink flow path (5) is filled with ink pressurized by the ink supply system (8) as shown in FIG.
It is satisfied as in a). In this state, by applying a voltage of several tens to hundreds of square meters between the electrode (7) and the movable valve (6) using a voltage source (not shown), polarization occurs in the movable valve (6), as shown in Fig. 1 (b). ), the movable valve (6) is drawn toward the electrode (7), the ink droplet outlet (4) opens, and pressurized ink is forced out from the ink droplet outlet (4).

その後、通電を中止すると、インク滴吐出口（４）が閉
じ、インクに与えられた加圧力と可動弁（６）が閉じる
ときの押力によって、インク滴吐出口（４）からインク
滴（６）が吐出され、第１図（ｃｌの様になる． 従って、記録信号に応答して可動弁（６）を開閉するこ
とによって、インク滴吐出口（４）からインク滴（９）
を吐出させることで記録媒体に記録が行われる。After that, when the electricity is turned off, the ink droplet ejection port (4) closes, and the ink droplet (6) from the ink droplet ejection port (4) is ) is ejected, as shown in Figure 1 (cl). Therefore, by opening and closing the movable valve (6) in response to the recording signal, the ink droplet (9) is ejected from the ink droplet ejection port (4).
Recording is performed on the recording medium by discharging the ink.

なお、前記ではインク滴吐出口（４）が単一で（ト）発
明の効果 本発明であるインクジエツＩ・記録ヘッドのインク流路
中には、腐食及び導電性の部材及び部品を使用すること
を要しないので、従来例の様なインク流路内の電気熱変
換体等を被覆保護する必要がなくなる。Note that in the above description, the ink droplet ejection opening (4) is single, and (g) Effects of the Invention Corrosive and conductive members and components are used in the ink flow path of the inkjet I recording head of the present invention. Therefore, there is no need to cover and protect the electrothermal converter and the like in the ink flow path as in the conventional example.

更に、インク滴は、可動弁が閉じるときの押力及びイン
ク供給系によるインクに対する加圧力で吐出させられる
ので、従来例の様な残留気泡吐出によるインク滴吐出不
良が生じない新規のインクジェット記録ヘッドを提供す
ることができる。Furthermore, since the ink droplets are ejected by the pressing force when the movable valve closes and the pressure applied to the ink by the ink supply system, this new inkjet recording head eliminates the ink droplet ejection failure caused by residual bubble ejection as in conventional examples. can be provided.

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

第１図は、本発明のインクジェット記録ヘッドの概略的
断面図で５第１図（ａ）は、インク滴吐出口の閉状態を
表す図、第１図（ｂ）は、インク滴吐出口の開状態を表
す図及び第ｌ図（ｃ．）は、インク滴の吐出状態を表す
図である。 また、第２図は、従来例におけるインクジェット記録ヘ
ッドの概略図で、第２図（ａ）は、インク滴の非吐出時
を表わす図、第２図（ｂ）は、インク滴が押し出された
状態を表す図及び第２図（Ｃ）は、インク滴の吐出状態
を表す図である。 ｆ４　１　（Ｉｆ）・・・インク滴吐出口、＜５　）　
（１３）・・・インク流路、（６　）　（１２＋・・一
可動弁、（７）・・・電極、（９　＋　＜１５＋・・−
インク滴、（１６）・・・電気熱変換体、（Ｉ８）・・
・気泡。FIG. 1 is a schematic cross-sectional view of the inkjet recording head of the present invention. FIG. 1(a) is a diagram showing the ink droplet ejection opening in a closed state, and FIG. The diagram showing the open state and FIG. 1(c) are diagrams showing the state in which ink droplets are ejected. FIG. 2 is a schematic diagram of a conventional inkjet recording head, and FIG. 2(a) is a diagram showing when ink droplets are not being ejected, and FIG. 2(b) is a diagram showing when ink droplets are not being ejected. The diagram showing the state and FIG. 2(C) are diagrams showing the state of ink droplet ejection. f4 1 (If)...Ink droplet ejection port, <5)
(13)...Ink channel, (6) (12+...1 movable valve, (7)...Electrode, (9+<15+...-
Ink droplet, (16)... Electrothermal converter, (I8)...
・Bubbles.

Claims (1)

【特許請求の範囲】[Claims] （１）インク滴吐出口と、該インク滴吐出口に連通し、
加圧インクが供給されるインク流路と、前記インク滴吐
出口の前記インク流路内に位置し、前記インク滴吐出口
の開閉を行うものであって、開状態から閉状態になるこ
とにより、前記インク滴吐出口からインク滴を吐出させ
る可動弁と、を備えたことを特徴とするインクジェット
記録ヘッド。(1) an ink droplet ejection port, communicating with the ink droplet ejection port;
It is located within the ink flow path to which pressurized ink is supplied and the ink flow path of the ink droplet ejection port, and opens and closes the ink droplet ejection port, by changing from the open state to the closed state. , a movable valve for ejecting ink droplets from the ink droplet ejection opening.
JP30023689A 1989-11-17 1989-11-17 Ink jet recording head Pending JPH03159748A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30023689A JPH03159748A (en) 1989-11-17 1989-11-17 Ink jet recording head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30023689A JPH03159748A (en) 1989-11-17 1989-11-17 Ink jet recording head

Publications (1)

Publication Number Publication Date
JPH03159748A true JPH03159748A (en) 1991-07-09

Family

ID=17882351

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30023689A Pending JPH03159748A (en) 1989-11-17 1989-11-17 Ink jet recording head

Country Status (1)

Country Link
JP (1) JPH03159748A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0872237A (en) * 1994-09-01 1996-03-19 Seiko Epson Corp Apparatus and method for driving ink jet head
JP2009012372A (en) * 2007-07-06 2009-01-22 Seiko Epson Corp Fluid jet nozzle, fluid jet device, and method for maintaining fluid jet device
JP2011201225A (en) * 2010-03-26 2011-10-13 Seiko Epson Corp Liquid jetting head, liquid jetting head unit and liquid jetting apparatus
CN106414081A (en) * 2014-06-04 2017-02-15 系统股份公司 A device for the inkjet printing of fluids, in particular glazes, onto tiles
WO2022259063A1 (en) * 2021-06-08 2022-12-15 Ricoh Company, Ltd. Liquid discharge head and liquid discharge apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0872237A (en) * 1994-09-01 1996-03-19 Seiko Epson Corp Apparatus and method for driving ink jet head
JP2009012372A (en) * 2007-07-06 2009-01-22 Seiko Epson Corp Fluid jet nozzle, fluid jet device, and method for maintaining fluid jet device
JP2011201225A (en) * 2010-03-26 2011-10-13 Seiko Epson Corp Liquid jetting head, liquid jetting head unit and liquid jetting apparatus
CN106414081A (en) * 2014-06-04 2017-02-15 系统股份公司 A device for the inkjet printing of fluids, in particular glazes, onto tiles
CN106414081B (en) * 2014-06-04 2018-11-27 系统股份公司 For by the device on fluid especially glaze inkjet printing to ceramic tile
WO2022259063A1 (en) * 2021-06-08 2022-12-15 Ricoh Company, Ltd. Liquid discharge head and liquid discharge apparatus

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