JPS61268453A - インクジエツトプリント用ヘツド - Google Patents

インクジエツトプリント用ヘツド

Info

Publication number
JPS61268453A
JPS61268453A JP11120485A JP11120485A JPS61268453A JP S61268453 A JPS61268453 A JP S61268453A JP 11120485 A JP11120485 A JP 11120485A JP 11120485 A JP11120485 A JP 11120485A JP S61268453 A JPS61268453 A JP S61268453A
Authority
JP
Japan
Prior art keywords
orifice
substrate
orifice plate
ink
resistor
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
JP11120485A
Other languages
English (en)
Inventor
Atsushi Yagi
厚志 八木
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP11120485A priority Critical patent/JPS61268453A/ja
Publication of JPS61268453A publication Critical patent/JPS61268453A/ja
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
    • B41J2/14016—Structure of bubble jet print heads
    • B41J2/14032—Structure of the pressure 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
    • 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
    • B41J2002/14475—Structure thereof only for on-demand ink jet heads characterised by nozzle shapes or number of orifices per chamber

Landscapes

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

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、インクジェットプリント用ヘッド、＜シ＜は
インクを小滴として飛翔させて記録紙に付着させ・るイ
ンクジェット方式のヘッドに関するものである。
［従来の技術］ インクジェット方式の記録法は、周知のようにインクの
微小な液滴を飛翔させて、これを記録紙等に付着させ画
像の記録を行なうものである。
このインクジェット方式の記録法には、従来、連続的に
発生する液滴を電界等により制御して記録を行なうコン
ティニュアス方式と記録が必要なときにのみオリフィス
よりインクの液滴を吐出させるオンデマンド方式とがあ
る。オンデマンド方式にはピエゾ振動素子の機械的振動
を用いて液滴を発生させる手段と、発熱素子の熱により
液滴を発生させる手段とがあるが、発熱素子を用いる手
段の方が記録速度を」二げるために重要なヘッドのマル
チ化が容易である等の有利な点が多い。
この発熱素子を用いるインクジェット方式の記録手段は
、特開昭５４−５９９３６号公報に記録法およびその装
置として開示されている。即ち、インク室中に設けられ
た発熱用抵抗体に記録信号としてパルスを印加すると発
熱によりインクが気化してバブルが発生し、そのバブル
の圧力によってインクをオリフィスより吐出させて記録
紙等に付着させ記録を行なうようにしたものである。と
ころが、このような記録手段においては隣接するヘッド
に形成されたバブルの圧力が他のオリフィスに及んで記
録信号が入力されていない発熱体素子に対応するオリフ
ィスからもインクの吐出が起るという不具合かあり、こ
れを防止するために、実開昭５９−１７４２４５号公報
および特開昭５９−２０７２６１号公報に示されるプリ
ントヘッドのように、各オリフィス間に障壁を設けて圧
力室を形成する技術手段が提案されている。
［発明が解決しようとする問題点］ 従来の各オリフィス間に障壁を設けて圧力室を形成する
技術手段では、ヘッドの形状が大変複雑化するので、ヘ
ッドを製作する際には圧力室のエツチング基板に対して
の接合等に、非常に高度の微細加工技術を必要とされる
。従って製作コストが高くつくという欠点を伴う。本発
明はこのような点に着目してなされたれものであって、
構造が簡単で製造が容易なインクジェットプリント用ヘ
ッドを提供することを目的とする。
［問題点を解決するための手段および作用］このプリン
ト用ヘッドでは、各オリフィス間に障壁などを設けるこ
となく、複数個の発熱用抵抗体を有する基板と、上記発
熱用抵抗体に対応する位置にオリフィスの穿設されたオ
リフィス板との対向配置距離を、１０〜４０μｍとした
ものである。
［実　施　例］ 先づ、本発明の詳細な説明するに先立ち、本発明のイン
クジェットプリント用ヘッドの基本的構成とその作用に
ついて説明しておくと、第１図に示す如く、基板１」−
にオリフィス板３を接合しインク室５を形成するのであ
るが、オリフィス板３の形状により発熱用抵抗体２とこ
れに対応する位置に穿設されたオリフィス４との間のギ
ャップか規制される。そして、抵抗体２にパルス電流を
印加してやると同抵抗体２は発熱し、これによってイン
クが気化し、第２図に示すようにバブル６が形成される
。そしてこのバブル６の圧力によってインク室５内のイ
ンクがインク滴７としてオリフィス４から吐出される。
パルス電流の印加が除去されると抵抗体２の温度は下が
り、第３図に示すようにバブル６は消去する。バブルが
消失した抵抗体２上にインクが再び供給されるためには
基板１とオリフィス板３との間の空隙を通じて外部から
インク室５内にインクを流し込む必要がある。
この場合、実験により基板１とオリフィス板３とのギャ
ップがｌＯｔ１ｍ以下であるとインクの流入速度が遅く
連続してインクを飛翔させることが困難となり、また逆
に基板１とオリフィス板３とのギャップやく４０μｍ以
」二になると、バブルの圧力が隣接するオリフィスに及
び第４図に示す如く、パルス電流の印加されていない抵
抗体２に対応するオリフィス４からもインクの吐出が起
り不必要な記録が行なわれることが判明した。従って、
基板１とオリフィス板３のギャップを１０〜４０μｍと
すれば、ヘッドとして充分な機能を有することになる。
′ 本発明は上記の実験結果に基づいて基板１とオリフィス
板３との離間距離を、１０〜４０μｍの間に規制するよ
うにしたものである。
以下、本発明の具体的な実施例を図面によって詳細に説
明する。第５図（Ａ）（Ｂ）は本発明の第１実施例を示
すプリント用ヘッドであって、パルス電流を印加するこ
とにより発熱する抵抗体２か基板１上に複数個、等間隔
に設けられている。
この基板１と一定距離の空間を保ちインク室５を形成す
るようにオリフィス板３かその外周縁部を気密および水
密的に基板１上に接合されている。
このオリフィス板３には」二記各抵抗体２に対応して、
直径２０〜１００μｍのオリフィス４か穿設されている
。従って、抵抗体２にパルス電流を印加すると発生する
熱によりインクが気化し、バブルが発生し、このバブル
の圧力によりインク室５内のインクがオリフィス４より
小滴となって飛翔し記録を行なう。この記録によって消
費されたインクは、基板１に穿設されたインク供給口８
を通じてインク室５内に補充される。
また、第６図（Ａ）（Ｂ）は本発明の第２実施例を示す
プリント用ヘッドである。この第２実施例において上記
第１実施例と相違する点は発熱用抵抗体２に対応して多
数のオリフィス４が穿設されていることである。その他
の構成は上記第５図（Ａ）（Ｂ）に示した第１実施例と
全く同様に構成されている。
次に上記基板１とオリフィス板４の間隔が記録の速度、
印字の室等へ、どのような影響を与えるかを検討するた
めに、その間隔を０〜１００μｍまで変化させると共に
、印加するパルスの間隔を３０〜１ｍ５ｅｃまで変化さ
せたときの記録の安定性および隣接するオリフィスへの
影響を実験した結果を示す。表１は上記第１実施例の結
果であり、表２は上記第２実施例の結果である。
なお、ヘッドに印加した電圧は３５ｖ、パルス幅５６ｎ
ｓｅｃである。
以下余白 表１ 記録の安定性　○・・・・・・連続して記録が可能△・
・・・・・一部記録が゛不完全な部分がある×・・・・
・・１つたく記録しない オリフィス間の干渉 ○・・・・・・隣接オリアイスからのインクの飛翔がな
い ×・・・・・・隣接オリフィスからのインクの飛翔があ
る 表２ 記録の安定性　○・・・・・・連続して記録が可能△・
・・・・・一部記録が不完全な部分がある×・・・・・
・まったく記録しない オリフィス、間の干渉 ○・・・・・・隣接するドツトに対応するオリヵ″上記
表１および表２に示すように、３０〜１ｍ５ｅｃのパル
ス間隔で連続的にパルスを印加し、記録の安定性を３段
階に評価した。即ち、印加したパルスに応じて連続的に
記録が行なわれるものを０１一部に記録の不完全な部分
が発生したものを△、インクが飛翔せず、全く記録が行
なわれないものを×とした。オリフィス板３と基板１の
距離が１０μｍ以上であれば、記録の安定性については
問題はないが、０μｍではパルス間隔を縮めるに従って
印字の安定性が悪くなる。これはオリフィス板３と基板
１との間から供給されるインクが間隔が狭くなると流れ
にくくなり記録速度に追いつかなくなるためである。
一方、隣接オリフィスへの緩衝は−っオキのヘッドにパ
ルスを印加し、パルスの印加されていない抵抗体に対応
するオリフィスからのインクの飛翔があるか、ないかを
観察した。そして、隣接したオリフィスからのインクの
飛翔のないものを０、飛翔のあるものを×とした。その
結果、５０μｍ・以」二で隣接するオリフィスへの干渉
が見られ、特にパルス間隔の短い範囲で多く発生した。
これは基板とオリフィス板との間隔を広げるに従ってバ
ブルの圧力が横方向に広がり隣接するヘッドからのイン
クの飛翔が起るものと考えらる。
従って、本発明のヘッドのように障壁を設けずに、圧力
室を形成しないようにするものでは、隣設するオリフィ
スへの圧力の漏れによる不必要なインクの飛翔を防止す
るためには基板とオリフィス板との距離を厳密に１０〜
４０μｍに規制する必要がある。
［発明の効果］ 以上述べたように、本発明によれば各オリフィス間の障
壁や隔壁を設ける必要がないので構成が極めて簡単とな
り、高速の連続印字が可能で、隣設する抵抗体の干渉に
よる不必要な記録の発生しない優れた記録特性をもつイ
ンクジェットプリント用ヘッドを提供することができる
。
【図面の簡単な説明】
第１図は、本発明の適用されるインクジェットプリント
用ヘッドの基本構成を示す断面図、第２，３図は、−に
記第１図のヘッドのインクジェット作用をそれぞれ示す
要部断面図、第４図は、バブルの各オリフィスへの干渉
作用を示す断面図、 第５図（Ａ）（Ｂ）は、本発明の第１実施例を示すプリ
ント用ヘッドの平面図および断面図、第６図（Ａ）（Ｂ
）は、本発明の第２実施例を示すプリント用ヘッドの平
面図および断面図である。 １・・・・・・・・・基板 ２・・・・・・・・・発熱用抵抗体 ３・・・・・・・・・オリフィス板 ４・・・・・・・・・オリフィス ５・・・・・・・・・インク室

Claims (1)

  1. 【特許請求の範囲】 複数個の発熱用抵抗体を有する基板と、この基板上に配
    設され、上記発熱用抵抗体に対応する位置に穿設されて
    いてインク小滴を吐出する複数個のオリフィスを有する
    オリフィス板とを具備し、上記基板とオリフィス板間に
    インクを収容するインクジェットプリント用ヘッドにお
    いて、 上記基板とオリフィス板の距離を、１０〜４０μｍとし
    たことを特徴とするインクジェットプリント用ヘッド。
JP11120485A 1985-05-23 1985-05-23 インクジエツトプリント用ヘツド Pending JPS61268453A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11120485A JPS61268453A (ja) 1985-05-23 1985-05-23 インクジエツトプリント用ヘツド

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11120485A JPS61268453A (ja) 1985-05-23 1985-05-23 インクジエツトプリント用ヘツド

Publications (1)

Publication Number Publication Date
JPS61268453A true JPS61268453A (ja) 1986-11-27

Family

ID=14555145

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11120485A Pending JPS61268453A (ja) 1985-05-23 1985-05-23 インクジエツトプリント用ヘツド

Country Status (1)

Country Link
JP (1) JPS61268453A (ja)

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