JPS58142864A - Recorder - Google Patents

Recorder

Info

Publication number
JPS58142864A
JPS58142864A JP2670582A JP2670582A JPS58142864A JP S58142864 A JPS58142864 A JP S58142864A JP 2670582 A JP2670582 A JP 2670582A JP 2670582 A JP2670582 A JP 2670582A JP S58142864 A JPS58142864 A JP S58142864A
Authority
JP
Japan
Prior art keywords
liquid chamber
nozzle hole
ink
orifice plate
flow path
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
JP2670582A
Other languages
Japanese (ja)
Inventor
Takuro Sekiya
卓朗 関谷
Yutaka Ebi
海老　豊
Takuo Isayama
伊佐山　拓郎
Masanori Horiie
正紀 堀家
Tatsuya Furukawa
達也 古川
Masaaki Tachiki
立木　雅彰
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 JP2670582A priority Critical patent/JPS58142864A/en
Publication of JPS58142864A publication Critical patent/JPS58142864A/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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
    • B41J2002/061—Ejection by electric field of ink or of toner particles contained in ink

Landscapes

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

Abstract

PURPOSE:To eliminate the need for a bias electrode, and to prevent a danger in case of handling by setting up electrodes to a surface on the liquid chamber side and a surface on the orifice side of an orifice plate made of an insulator with a nozzle hole of a shape of which an outlet is throttled toward the inside of a liquid chamber. CONSTITUTION:The front of an ink jet head 1 is formed by the orifice plate made of the insulator with the nozzle hole 2 tapered toward the inside of the liquid chamber 5, and the surface on the liquid chamber 5 side and the surface on the orifice side of the orifice plate are provided with the control electrodes 3, 4 while a gas flow path 6 coaxial with the nozzle hole 2 is formed into the liquid chamber 5. Pressure is applied to ink in the liquid chamber 5 by a gas 7 in the flow path 6 and bias pressure is formed, and picture signal voltage is applied between the electrodes 3, 4 and ink drips 8 are injected from the nozzle hole 2 and attached and recorded to recording paper 9.

Description

【発明の詳細な説明】 本発明は、電界オンデマンド型インクジェット記録装置
の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of an electric field on-demand type ink jet recording apparatus.

電界を用いてインクを飛翔させる所謂電界オンデマンド
型のインクジェット記録装置は既に提案されているが、
従来の電界オンデマンド型インクジェット記録装置は、
ノズルの前面若しくは記録紙の背面よりバイアス電圧を
かけ、ノズル先端部のインクに該ノズルからインク滴が
飛び出さない程度のバイアス電界をかけるようにしてい
る。しかし、この従来の方法によると、くマイアス電圧
として数ＫＶ必要であり、回路上のコストが高くつき、
また、高電圧を使用しているため、特り扱いに注意を要
する等の欠点があった。A so-called electric field on-demand type inkjet recording device that uses an electric field to fly ink has already been proposed.
Conventional electric field on-demand type inkjet recording devices are
A bias voltage is applied from the front side of the nozzle or the back side of the recording paper, and a bias electric field is applied to the ink at the tip of the nozzle to the extent that ink droplets do not fly out from the nozzle. However, according to this conventional method, several kilovolts are required as the bias voltage, and the circuit cost is high.
In addition, since high voltage is used, there are drawbacks such as the need for special handling.

本発明は、上述のごとき従来技術の欠点を解消するため
ｌこなされたもので、特に、前記従来技術におけるバイ
アス電極をなくシ、構成が簡単かつ安価で、しかも、取
り扱いに際し危険のないインクジェット記録装置を提供
しようとするものである。The present invention has been accomplished in order to eliminate the drawbacks of the prior art as described above, and in particular, eliminates the bias electrode in the prior art, has a simple and inexpensive structure, and is not dangerous to handle. The aim is to provide equipment.

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要部側断面図で、図中、１はイン
クジェ、トヘ、ド、２はオリフィス（ノズル孔）、３及
び４は制御電極、５は液室、６は気体流路、７は気体、
８は飛翔インク滴、９は記録紙で、図示のように、ヘッ
ドの前面にノズル孔があり、該ノズル孔は液室の内部に
向ってテーバ状に広くなっており、制御電極及び気体流
路はノズル孔と同軸に配列されている。また、液室内の
インクには、気体流路からの気体圧がかかっているか、
この気体圧はノズル孔からインクが吐出しない程度の圧
力で、後述のスイッチングを容易にするためのバイアス
となっている。FIG. 1 is a side cross-sectional view of essential parts for explaining an embodiment of an inkjet recording apparatus according to the present invention. Control electrode, 5 is a liquid chamber, 6 is a gas flow path, 7 is a gas,
8 is a flying ink droplet, 9 is a recording paper, and as shown in the figure, there is a nozzle hole on the front side of the head, and the nozzle hole widens in a tapered shape toward the inside of the liquid chamber, and the control electrode and gas flow The channel is arranged coaxially with the nozzle hole. Also, check whether the ink in the liquid chamber is under gas pressure from the gas flow path.
This gas pressure is such that no ink is ejected from the nozzle hole, and serves as a bias to facilitate switching, which will be described later.

制御電極３．４間に電界を加えると、電界は第２図に示
すようになり、ノズル出口方向に向って電界が集中し、
インクをノズル孔から吐出させるような力が働くが、こ
の力Ｆは、 ？＝＝ａ　−ｇｒａｄ（Ｅ）　＋　Ｐ　＊　８−（１）
’（ただし、α：インクの分極率による係数、Ｐ；気圧
の圧力、Ｓ：気体流路の断面積、Ｅ：電界強度） となり、第１項に示す分極による力と、第２項に示す気
体の圧力による力とが合成されたものとなっている。When an electric field is applied between the control electrodes 3 and 4, the electric field becomes as shown in Figure 2, and the electric field is concentrated toward the nozzle exit.
A force acts that causes ink to be ejected from the nozzle hole, but this force F is ? ==a-grad(E)+P*8-(1)
' (where α: coefficient due to ink polarizability, P: atmospheric pressure, S: cross-sectional area of gas flow path, E: electric field strength), and the force due to polarization shown in the first term and the force shown in the second term It is a combination of the force due to gas pressure.

印写原理は、気体流路より圧力をかけておき、ｐ＠ｓの
力がノズル孔のインク・に該インクをノズル孔から吐出
させるための力のバイアスとしてかかっており、制御電
極３．４間に画像信号（約６００ｖ）を与えた時に、ノ
ズル孔内のインクにα・ｇｒａｄ　（Ｅ　）の力がかか
り、核力がインク吐出オン・オフのスイッチングとなる
。なお、分極力を大きくするためには、電界強度（ｉ）
の微分を大きくした方がよく、そのためには、ノズル孔
の形状を液室側に広くした円錐形状とし、その角度θを
大きくした方が良い。また、画像信号は交流でもよく、
或いは、パルス幅又は振幅を制御して中間調を出すよう
にしてもよい。また、インクの物性は、粘性、表面張力
、密度も大きな因子であるが、このプロセスには導電性
が大きく影響し、１０６Ｍｃｍ以上の抵抗を有すること
が必要である。The printing principle is that pressure is applied from the gas flow path, and the p@s force is applied to the ink in the nozzle hole as a bias force to cause the ink to be ejected from the nozzle hole. When an image signal (approximately 600 V) is applied between them, a force of α·grad (E ) is applied to the ink within the nozzle hole, and the nuclear force switches on/off ink ejection. In addition, in order to increase the polarization force, the electric field strength (i)
It is better to increase the differential of , and for this purpose, it is better to make the shape of the nozzle hole a conical shape that is widened toward the liquid chamber side, and to increase the angle θ. Also, the image signal may be alternating current,
Alternatively, halftones may be produced by controlling the pulse width or amplitude. Further, although viscosity, surface tension, and density are major factors in the physical properties of ink, conductivity has a large influence on this process, and it is necessary to have a resistance of 10 6 Mcm or more.

以上の説明から明らかなように、本発明によると、イン
クジェットへ、ドと記録紙間、或いは、記録紙の背面に
従来の電界オンデマンド型インクジェット記録装置で必
要としたようなバイアス電極等を必要とせず、非常にシ
ンプルで理想的な新規なオンデマンド型インクジェット
記録装置を提供することができる。As is clear from the above description, according to the present invention, a bias electrode, etc., which is required in the conventional electric field on-demand type inkjet recording device, is not required between the inkjet and the recording paper, or on the back of the recording paper. Therefore, it is possible to provide an extremely simple and ideal new on-demand inkjet recording device.

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

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要部側断面図、第２図は、第１図
に示したインクジェット記録装置の電界分布を示す図で
ある。 １・・・インクジェットヘッド、２・・・ノズル孔（オ
リフィス）、３．４・・・制御電極、５・・・液室、６
・・・気体流路、７・・・気体、８・・・飛翔インク、
９・・・記録紙。 ３４２FIG. 1 is a sectional side view of a main part for explaining an embodiment of an inkjet recording apparatus according to the present invention, and FIG. 2 is a diagram showing an electric field distribution of the inkjet recording apparatus shown in FIG. 1. DESCRIPTION OF SYMBOLS 1... Inkjet head, 2... Nozzle hole (orifice), 3.4... Control electrode, 5... Liquid chamber, 6
... Gas flow path, 7... Gas, 8... Flying ink,
9... Recording paper. 342

Claims (1)

【特許請求の範囲】[Claims] ノズルからインク滴を噴射させて記録紙に印写を行うイ
ンクジェット記録装置において、前記ノズルを絶縁体の
オリフィス板にて構成し、該オリフィス板に設けられた
ノズル孔を液室方向に開いて出口をしばった形状にする
とともに、該オリフィス板の液室側の面とオリフィス側
の面に電極を設け、かつ、液室内部に前記ノズル孔と同
軸に気体流路を設け、該気体流路の気体圧力をインクに
加えてバイアス圧力とし、前記電極間に電圧を加えて前
記ノズル孔より、インク滴を噴射させるようにしたこ乏
を特徴とする記録装置。In an inkjet recording device that prints on recording paper by ejecting ink droplets from a nozzle, the nozzle is constructed of an insulating orifice plate, and a nozzle hole provided in the orifice plate is opened toward the liquid chamber to form an exit. At the same time, electrodes are provided on the liquid chamber side surface and the orifice side surface of the orifice plate, and a gas flow path is provided inside the liquid chamber coaxially with the nozzle hole, and the gas flow path is A recording apparatus characterized in that a gas pressure is applied to the ink to create a bias pressure, and a voltage is applied between the electrodes to eject ink droplets from the nozzle holes.
JP2670582A 1982-02-20 1982-02-20 Recorder Pending JPS58142864A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2670582A JPS58142864A (en) 1982-02-20 1982-02-20 Recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2670582A JPS58142864A (en) 1982-02-20 1982-02-20 Recorder

Publications (1)

Publication Number Publication Date
JPS58142864A true JPS58142864A (en) 1983-08-25

Family

ID=12200795

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2670582A Pending JPS58142864A (en) 1982-02-20 1982-02-20 Recorder

Country Status (1)

Country Link
JP (1) JPS58142864A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113199867A (en) * 2021-04-12 2021-08-03 华中科技大学 Electrofluid jet patterning induction method and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113199867A (en) * 2021-04-12 2021-08-03 华中科技大学 Electrofluid jet patterning induction method and system
CN113199867B (en) * 2021-04-12 2022-06-14 华中科技大学 Electrofluid jet patterning induction method and system

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