JPH01128839A - Inkjet recording head - Google Patents

Inkjet recording head

Info

Publication number
JPH01128839A
JPH01128839A JP28680187A JP28680187A JPH01128839A JP H01128839 A JPH01128839 A JP H01128839A JP 28680187 A JP28680187 A JP 28680187A JP 28680187 A JP28680187 A JP 28680187A JP H01128839 A JPH01128839 A JP H01128839A
Authority
JP
Japan
Prior art keywords
electromechanical transducer
recording liquid
nozzle
flow path
liquid flow
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
JP28680187A
Other languages
Japanese (ja)
Inventor
Naoki Kozuka
直樹 小塚
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 JP28680187A priority Critical patent/JPH01128839A/en
Publication of JPH01128839A publication Critical patent/JPH01128839A/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
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B41J2/14282—Structure of print heads with piezoelectric elements of cantilever type

Landscapes

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

Abstract

PURPOSE:To realize a compact structure of an inkjet recording head having highly-dense nozzles, by arranging one surface of an electromechanical transducer opposed to a flow passage of a recording liquid, and at the same time supported in a cantilever structure. CONSTITUTION:An electromechanical transducer 2 is comprised of an electric distortion vibrator 2a and an elastic plate 2b coupled to each other. The element 2 is so arranged that the side of the elastic plate 2b is opposed to a flow passage 4 of a recording liquid communicating with a nozzle 3. One end of the elastic plate 2b is fixedly supported in a cantilever structure at a fixing part 7 of the element at the opposite side to the nozzle 3. When the fixing part 7 at the opposite side of the nozzle 3 is displaced at right angles to the flow passage 4, the element 2 is displaced in a manner that the recording liquid 5 is pressed out towards the nozzle 3. Therefore, it is more effective to project liquid drops from the nozzle 3. Moreover, since the element 2 is supported in a cantilever structure, an end position of the element can be greatly displaced, whereby a large change in volume can be obtained.

Description

【発明の詳細な説明】 １４立夏 本発明は、インクジェット記録ヘッドに関する。[Detailed description of the invention] 14th summer The present invention relates to an inkjet recording head.

灸来挟嵐 第５図は、従来のインクジェット記録ヘリドの一例を説
明するための構成図で、（ａ）図は要部断面図、（ｂ）
図は複数個のノズルを一列に配置した場合の一例を説明
するための平面図で、図中、１は加圧室、２は電歪振動
子２ａと弾性板２ｂとから成る電気機械変換素子、３は
ノズル、４は記録液流路、５は記録液で、周知のように
、加圧室１の壁の一部に設けた電気機械変換素子２を印
字信号に応じて変位させて該加圧室１の体積変化を圧力
変化として該加圧室１の記録液５に伝達してノズル３よ
り液滴を噴射させるものである。Figure 5 is a configuration diagram for explaining an example of a conventional inkjet recording helide; (a) is a sectional view of the main part, (b)
The figure is a plan view for explaining an example of a case where a plurality of nozzles are arranged in a row. In the figure, 1 is a pressurizing chamber, 2 is an electromechanical transducer consisting of an electrostrictive vibrator 2a and an elastic plate 2b. , 3 is a nozzle, 4 is a recording liquid flow path, and 5 is a recording liquid.As is well known, an electromechanical transducer 2 provided on a part of the wall of the pressurizing chamber 1 is displaced in accordance with a print signal. The change in volume of the pressurizing chamber 1 is transmitted as a pressure change to the recording liquid 5 in the pressurizing chamber 1, and droplets are ejected from the nozzle 3.

しかしながら、上述のインクジェット記録ヘッドにおい
ては、電気機械変換素子２がその周囲で固定されている
ため、この電気機械変換素子２によって発生し得る変位
は剛性の面から極めて小さく、所望の圧力変化を得るた
めには、より大面積の電気機械変換素子２を有する壁を
必要とすることから加圧室１が大型化し、ノズルの高密
度化ができなかった。However, in the above-mentioned inkjet recording head, since the electromechanical transducer 2 is fixed around the electromechanical transducer 2, the displacement that can be generated by the electromechanical transducer 2 is extremely small in terms of rigidity, and the desired pressure change can be achieved. In order to achieve this, a wall having a larger area of the electromechanical transducer 2 is required, which increases the size of the pressurizing chamber 1 and makes it impossible to increase the density of the nozzles.

上記のような欠点を解消するために、（ｂ）に示すよう
に、加圧室とノズルの間に記録液流路４を設け、この記
録液流路４を這い回してノズル３の高密度化を図ってい
るが、この方法はノズルの高密度化を図ることができる
ものの記録液流路を這い回すためヘッドの大型化は避け
られない。In order to eliminate the above-mentioned drawbacks, as shown in (b), a recording liquid flow path 4 is provided between the pressurizing chamber and the nozzle. Although this method can increase the density of the nozzles, it inevitably increases the size of the head because it crawls around the recording liquid flow path.

第６図は、他の従来例を示すための要部断面図で、図中
、６は衝撃棒片、７は電気機械変換素子２の固定部、８
はノズル入口開口部で、周知のように、電気機械変換素
子２は記録液５中においてその一端が固定部７で固定支
持され、他端に設けられた衝撃棒片６がノズル入口開口
部８の前方に配置され、この衝撃棒片６の変位による圧
力変化が加圧室１の記録液５に伝達されて、ノズル３よ
り液滴を噴射させるものである。FIG. 6 is a sectional view of main parts to show another conventional example, in which 6 is an impact rod piece, 7 is a fixed part of the electromechanical transducer 2, and 8
is a nozzle inlet opening, and as is well known, one end of the electromechanical transducer 2 is fixedly supported by a fixing part 7 in the recording liquid 5, and an impact rod piece 6 provided at the other end is connected to the nozzle inlet opening 8. The pressure change caused by the displacement of the impact rod 6 is transmitted to the recording liquid 5 in the pressurizing chamber 1, causing droplets to be ejected from the nozzle 3.

上述の例においては、電気機械変換素子２が片持ち支持
されているので、第５図に示した例に比してより大きい
変位を得ることができるが、この変位によって所望の圧
力変化を得るためには、電気機械変換素子２の先端に設
けられた衝撃棒片６のノズル方向に対して垂直な断面積
を大きくする必要があり、第５図に示した従来技術と同
様、ノズルの高密度化が困難であった。In the above example, since the electromechanical transducer 2 is supported in a cantilever manner, it is possible to obtain a larger displacement than in the example shown in FIG. 5, and by this displacement, the desired pressure change can be obtained. In order to achieve this, it is necessary to increase the cross-sectional area perpendicular to the nozzle direction of the impact rod piece 6 provided at the tip of the electromechanical transducer 2, and as with the conventional technology shown in FIG. Densification was difficult.

目　　　　　的 本発明は、上述のごとき実情に鑑みてなされたもので、
特に、従来技術のように、加圧室と記録液流路を独立し
て設けることなく、電気機械変換素子の一つの面を記録
液流路に対向させて加圧室を構成するようにすることに
よって小型化を実現し、更には、ノズルの高密度化を図
ることを目的としてなされたものである。Purpose The present invention was made in view of the above-mentioned circumstances.
In particular, instead of providing a pressurizing chamber and a recording liquid flow path independently as in the prior art, one surface of the electromechanical transducer element is made to face the recording liquid flow path to form a pressurizing chamber. This was done with the aim of realizing miniaturization and further increasing the density of the nozzles.

構　　　成 本発明は、上記の目的を達成させるため、電気機械変換
素子を有し、該電気機械変換素子に印加される印字信号
に対応して生じる該電気機械変換素子の変位を圧力変化
として記録液に伝達してノズルより記録液を噴射させる
ようにしたインクジェット記録ヘッドにおいて、前記電
気機械変換素子の一つの面に対向して配設され前記ノズ
ルに連通している溝状の記録液流路を有し、前記電気機
械変換素子を前記ノズルに対して反対側の一端で固定す
るとともに前記記録液流路に対して垂直の方向に駆動す
るようにした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。Structure In order to achieve the above object, the present invention includes an electromechanical transducer, and converts the displacement of the electromechanical transducer that occurs in response to a print signal applied to the electromechanical transducer into a pressure change into a recording liquid. In the inkjet recording head, the recording liquid is ejected from the nozzle by transmitting a signal to the electromechanical transducer. The electromechanical transducer is fixed at one end opposite to the nozzle and is driven in a direction perpendicular to the recording liquid flow path. Hereinafter, the present invention will be explained based on examples.

第１図は１本発明によるインクジェット記録ヘッドの一
実施例を説明するための要部断面図、第２図は、本発明
によるインクジェット記録ヘッドの電気機械変換素子を
複数個クシ歯状に配列した場合の例を示すための概観図
で、第１図は、第２図の１−１線断面図である。図中、
２は電気機械変換素子で、該電気機械変換素子２は、前
述のように、電歪振動子２ａと弾性板２ｂとを結合させ
て成り１弾性板２ｂ側がノズル３に連通した記録液流路
４に対向して配置され、その一端がノズル３に対して反
対側の電気機械変換素子固定部７で片持ち梁になるよう
に固定支持されて、記録液流路４に対して垂直方向すな
わち矢印入方向に変位させるようになっている。FIG. 1 is a sectional view of a main part for explaining one embodiment of an inkjet recording head according to the present invention, and FIG. 2 is a sectional view of a plurality of electromechanical transducers of an inkjet recording head according to the present invention arranged in a comb-like shape. FIG. 1 is a sectional view taken along the line 1-1 in FIG. 2. In the figure,
Reference numeral 2 denotes an electromechanical transducer; as described above, the electromechanical transducer 2 is formed by combining an electrostrictive vibrator 2a and an elastic plate 2b, and has a recording liquid flow path in which the elastic plate 2b side communicates with the nozzle 3. 4, one end of which is fixedly supported in a cantilever manner by an electromechanical transducer fixing part 7 on the opposite side to the nozzle 3, and is arranged in a direction perpendicular to the recording liquid flow path 4, that is, It is designed to be displaced in the direction indicated by the arrow.

第３図（ａ）〜（ｄ）は、本発明の動作原理を説明する
ための要部構成図で、（ａ）図は電気機械変換素子２に
印字信号が印加されていない峙つより電気機械変換素子
２が変位されていない時の状態、（ｂ）図は印字信号が
印加された時つまり電気機械変換素子２が記録液流路４
から離れる方向に変位した時の状態、（Ｃ）図は（ｂ）
図に示す状態から印字信号が解除されて電気機械変換素
子２が（ｂ）図に示す状態から記録液流路４に接近した
場合の状態を示し、この（ｂ）図から（ｃ）図の状態に
変位する時に記録液流路４内の記録液５を加圧し、原理
的には（ｄ）図にΔ■にて示す体積の記録液をノズル３
より噴射させる。FIGS. 3(a) to 3(d) are main part configuration diagrams for explaining the operating principle of the present invention. FIG. The diagram (b) shows the state when the mechanical transducer 2 is not displaced, that is, when the print signal is applied, that is, the electromechanical transducer 2 is in the recording liquid flow path 4.
The state when displaced in the direction away from the (C) figure is (b)
This shows the state when the printing signal is released from the state shown in the figure and the electromechanical transducer 2 approaches the recording liquid flow path 4 from the state shown in the figure (b). In principle, the recording liquid 5 in the recording liquid flow path 4 is pressurized and the recording liquid in the volume shown by Δ■ in FIG.
Make it spray more.

このように、電気機械変換素子の固定部７をノズル３に
対して反対側に設けて記録液流路４に対して垂直に変位
させた場合、電気機械変換素子２が記録液５をノズル３
の方向に押し出すように変位するので、ノズル３より液
滴を噴射させるためにはより効果的であり、更には、電
気機械変換素子２が片持梁りで構成されているので、先
端（自由端側）の変位が大きく、従って大きな体積変化
を得ることが可能である。In this way, when the fixed part 7 of the electromechanical transducer is provided on the opposite side to the nozzle 3 and is displaced perpendicularly to the recording liquid flow path 4, the electromechanical transducer 2 transfers the recording liquid 5 to the nozzle 3.
Since the electromechanical transducer element 2 is configured as a cantilever, it is more effective for ejecting droplets from the nozzle 3. The displacement on the end side) is large, and therefore it is possible to obtain a large volume change.

第４図（ａ）乃至第４図（ｅ）は、電気機械変換素子２
に印字信号が印加されていない時の電気機械変換素子２
と記録液流路４の位置関係を示すための図で、各図とも
第１図のＴＶ−ＩＶ線方向から見た図に相当する断面図
で、図中、１０は薄膜フィルム、１１は記録液流路上面
であり、（ａ）図〜（Ｃ）図は、電気機械変換素子２が
記録液５中に配設されている場合の例を示し、（ａ）図
は、記録液流路４の幅に対して若干幅の広い電気機械変
換素子２が記録液流路上面１１に接触しないように少し
ギャップをもって配設されている例、（ｂ）図は、記録
液流路４より幅の狭い電気機械変換素子２が記録液流路
４の溝の中に若干挿入されて配設されている例、（Ｃ）
図は、記録液流路４より若干広い電気機械変換素子２が
記録液流路上面１１に接触して配設されている例である
。又、（ｄ）図および（ｅ）図は、記録液流路４と電気
機械変換素子２との間に薄膜フィルム１０を設け、電気
機械変換素子２が直接、記録液流路４の記録液５に接触
しないようにした場合の例を示し、（ｄ）図は、電気機
械変換素子２が記録液流路４の溝の中に若干挿入されて
配設されている例、（ｅ）図は、記録液流路４の幅より
若干広い電気機械変換素子２が薄膜フィルム１０を介し
て記録液流路上面１１に接触するように配設されている
例であるが、本発明がこれらの例に限定されるものでな
いことは容易に理解できよう。4(a) to 4(e) show the electromechanical transducer 2
Electromechanical transducer 2 when no printing signal is applied to
This is a diagram for showing the positional relationship between the recording liquid flow path 4 and the recording liquid flow path 4. Each diagram is a cross-sectional view corresponding to the diagram seen from the TV-IV line direction in FIG. Figures (a) to (C) show examples in which the electromechanical transducer 2 is disposed in the recording liquid 5, and (a) shows the upper surface of the recording liquid flow path. An example in which the electromechanical transducer 2, which is slightly wider than the width of the recording liquid flow path 4, is arranged with a slight gap so as not to contact the upper surface 11 of the recording liquid flow path, FIG. An example in which the narrow electromechanical transducer 2 is slightly inserted into the groove of the recording liquid flow path 4, (C)
The figure shows an example in which an electromechanical transducer 2 that is slightly wider than the recording liquid flow path 4 is disposed in contact with the upper surface 11 of the recording liquid flow path. In addition, in FIGS. 4(d) and 4(e), a thin film 10 is provided between the recording liquid flow path 4 and the electromechanical transducer 2, and the electromechanical transducer 2 directly transfers the recording liquid in the recording liquid flow path 4. (d) shows an example in which the electromechanical transducer 2 is slightly inserted into the groove of the recording liquid flow path 4; is an example in which the electromechanical transducer element 2, which is slightly wider than the width of the recording liquid flow path 4, is arranged so as to be in contact with the recording liquid flow upper surface 11 via the thin film 10. It is easy to understand that the invention is not limited to the examples.

上述の実施例に示すように、本発明によると、電気機械
変換素子２の幅を記録液流路４の幅と同程度とすればよ
いので小型化が実現でき、ノズルの高密度化を図ること
が可能となる。又、電気機械変換素子２の変位によって
得られる体積変化を変更する必要がある場合は、電気機
械変換素子２の長手方向の長さを変えればよいので簡単
に変更することができる。更には、第２図に示したよう
に電気機械変換素子２を複数個クシ歯状に配列すること
によって、ノズルの高密度化、組立時の作業効率の向上
を図ることができる。As shown in the embodiments described above, according to the present invention, the width of the electromechanical transducer 2 can be made approximately the same as the width of the recording liquid flow path 4, so miniaturization can be achieved and the nozzle density can be increased. becomes possible. Further, if it is necessary to change the volume change obtained by the displacement of the electromechanical transducer 2, the change can be easily made by changing the length of the electromechanical transducer 2 in the longitudinal direction. Furthermore, by arranging a plurality of electromechanical transducers 2 in a comb-like pattern as shown in FIG. 2, it is possible to increase the density of the nozzle and improve work efficiency during assembly.

効　　　果 上述の説明から明らかなように１本発明においては、特
別な加圧室を設けることなく、電気機械変換素子の一つ
の面を記録液流路に対向させて、かつ、片持ち支持した
簡単な構成とすることで、小型化が実現でき、更には、
ノズルの高密度化を図ることができる。又、電気機械変
換素子の変位がノズルの方向に記録液を押し出すように
作用するのでノズルからの記録液の吐出効率の向上を図
ることができる。又、電気機械変換素子を記録液中に配
設させた構成とすることによってヘッドの簡素化、生産
コストの軽減ができる。Effects As is clear from the above description, in the present invention, one surface of the electromechanical transducer is faced to the recording liquid flow path and supported in a cantilever manner without providing a special pressurizing chamber. With a simple configuration, miniaturization can be achieved, and furthermore,
It is possible to increase the density of the nozzle. Furthermore, since the displacement of the electromechanical transducer acts to push out the recording liquid in the direction of the nozzle, it is possible to improve the efficiency of ejecting the recording liquid from the nozzle. Furthermore, by arranging the electromechanical transducer in the recording liquid, the head can be simplified and production costs can be reduced.

更に、薄膜フィルムを用いて、電気機械変換素子が記録
液流路の記録液に直接接触しないようにすることによっ
て、電気機械変換素子部での記録液によるリークを防止
でき、又、記録液も非導電性のみに限定されることなく
自由に選択できる等の利点を有する。Furthermore, by using a thin film to prevent the electromechanical transducer from coming into direct contact with the recording liquid in the recording liquid flow path, it is possible to prevent the recording liquid from leaking in the electromechanical transducer element, and to prevent the recording liquid from coming into contact with the electromechanical transducer. It has the advantage that it can be freely selected without being limited to only non-conductive properties.

更には、電気機械変換素子を複数個クシ歯状に配列する
ことによって、ノズルの高密度化並びに組立時の作業効
率の向上を図ることができる。Furthermore, by arranging a plurality of electromechanical transducers in a comb-like shape, it is possible to increase the density of the nozzle and improve work efficiency during assembly.

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

第１図は１２２本発明よるインクジェット記録ヘッドを
説明するための要部断面図で第２図の！−！線断面図、
第２図は、本発明によるインクジェット記録ヘッドの一
例を示すための平面図、第３図（ａ）乃至第３図（ｄ）
は、本発明が適用されるインクジェット記録ヘッドの動
作説明をするための図、第４図（ａ）乃至第４図（ｅ）
は、それぞれ第１図のｖ−ｖ線方向から見た図に相当す
る断面図、第５図および第６図は、従来のインクジェッ
ト記録ヘッドを説明するための構成図である。 １・・・加圧室、２ａ・・・電歪振動子、２ｂ・・・弾
性板。 ２・・・電気機械変換素子、３・・・ノズル、４・・・
記録液流路、５・・・記録液、６・・・衝撃棒片、７・
・・電気機械変換素子固定部、８・・・ノズル入口開口
部、１０・・・薄膜フィルｌｘ、１１・・・記録液流路
上面。 第　１　　図　　　　　　　　　　　第　２　　面宵　
３　図 ｄ１FIG. 1 is a sectional view of a main part for explaining an inkjet recording head according to the present invention, and FIG. -! line cross section,
FIG. 2 is a plan view showing an example of an inkjet recording head according to the present invention, and FIGS. 3(a) to 3(d)
4(a) to 4(e) are diagrams for explaining the operation of the inkjet recording head to which the present invention is applied.
1 is a sectional view corresponding to a view taken along the v-v line in FIG. 1, and FIGS. 5 and 6 are configuration diagrams for explaining a conventional inkjet recording head. 1... Pressure chamber, 2a... Electrostrictive vibrator, 2b... Elastic plate. 2... Electromechanical conversion element, 3... Nozzle, 4...
Recording liquid flow path, 5... Recording liquid, 6... Impact rod piece, 7.
. . . Electromechanical transducer fixing portion, 8 . . . Nozzle inlet opening, 10 . . . Thin film filter lx, 11 . Figure 1 Figure 2
3 Figure d1

Claims (4)

【特許請求の範囲】[Claims] （１）、電気機械変換素子を有し、該電気機械変換素子
に印加される印字信号に対応して生じる該電気機械変換
素子の変位を圧力変化として記録液に伝達してノズルよ
り記録液を噴射させるようにしたインクジェット記録ヘ
ッドにおいて、前記電気機械変換素子の一つの面に対向
して配設され前記ノズルに連通している溝状の記録液流
路を有し、前記電気機械変換素子を前記ノズルに対して
反対側の一端で固定するとともに前記記録液流路に対し
て垂直の方向に駆動するようにしたことを特徴とするイ
ンクジェット記録ヘッド。(1) It has an electromechanical transducer, and the displacement of the electromechanical transducer that occurs in response to a print signal applied to the electromechanical transducer is transmitted to the recording liquid as a pressure change, and the recording liquid is drawn from the nozzle. The inkjet recording head configured to eject liquid has a groove-shaped recording liquid flow path disposed opposite to one surface of the electromechanical transducer and communicating with the nozzle, and the electromechanical transducer An inkjet recording head, characterized in that it is fixed at one end opposite to the nozzle and is driven in a direction perpendicular to the recording liquid flow path. （２）、前記電気機械変換素子が記録液中に配置されて
いることを特徴とする特許請求の範囲第（１）項に記載
のインクジェット記録ヘッド。(2) The inkjet recording head according to claim (1), wherein the electromechanical transducer is disposed in a recording liquid. （３）、前記電気機械変換素子と前記記録液流路との間
に薄膜フィルムが介在し、前記電気機械変換素子の変位
が、該薄膜フィルムを介して記録液に伝達されるように
したことを特徴とする特許請求の範囲第（１）項に記載
のインクジェット記録ヘッド。(3) A thin film is interposed between the electromechanical transducer and the recording liquid flow path, and the displacement of the electromechanical transducer is transmitted to the recording liquid via the thin film. An inkjet recording head according to claim (1), characterized in that: （４）、前記電気機械変換素子が複数個クシ歯状に配列
されていることを特徴とする特許請求の範囲第（１）項
又は第（２）項又は第（３）項に記載のインクジェット
記録ヘッド。(4) The inkjet according to claim (1), (2), or (3), wherein a plurality of the electromechanical transducers are arranged in a comb-like shape. recording head.
JP28680187A 1987-11-13 1987-11-13 Inkjet recording head Pending JPH01128839A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28680187A JPH01128839A (en) 1987-11-13 1987-11-13 Inkjet recording head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28680187A JPH01128839A (en) 1987-11-13 1987-11-13 Inkjet recording head

Publications (1)

Publication Number Publication Date
JPH01128839A true JPH01128839A (en) 1989-05-22

Family

ID=17709222

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28680187A Pending JPH01128839A (en) 1987-11-13 1987-11-13 Inkjet recording head

Country Status (1)

Country Link
JP (1) JPH01128839A (en)

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