JPS61173947A - Ink jet head - Google Patents

Ink jet head

Info

Publication number
JPS61173947A
JPS61173947A JP1502085A JP1502085A JPS61173947A JP S61173947 A JPS61173947 A JP S61173947A JP 1502085 A JP1502085 A JP 1502085A JP 1502085 A JP1502085 A JP 1502085A JP S61173947 A JPS61173947 A JP S61173947A
Authority
JP
Japan
Prior art keywords
orifice
ink
inkjet
stopped
ink jet
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
JP1502085A
Other languages
Japanese (ja)
Inventor
Takuro Sekiya
卓朗 関谷
Hiromichi Komai
博道 駒井
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 JP1502085A priority Critical patent/JPS61173947A/en
Publication of JPS61173947A publication Critical patent/JPS61173947A/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
    • B41J2/17—Ink jet characterised by ink handling
    • 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

PURPOSE:To always direct ink jet to the same direction when the injection of ink is started and stopped, by providing a non-symmetric part to an orifice. CONSTITUTION:If a protruded part 11 and a recessed part 12 for making an orifice 10 asymmetric are provided to the lower side of the orifice 10, the ink droplet injected from the orifice 10 always rises from the lower side and stopped in a state directed to the lower side when the injection of ink is started and stopped. The asymmetric part may be provided to the A-part, B-part or C-part of the outlet side of the orifice or in the orifice. By providing the above- mentioned asymmetric part, the disturbance of ink jet is eliminated when the injection of the ink is started and stopped and stop and start can be performed in such a state that ink jet is always directed to a desired direction. As a result, the contamination of a head periphery, especially, the contamination of a charging electrode can be prevented and reliability is enhanced.

Description

【発明の詳細な説明】 肢血公立 本発明は、インクジェットヘッド、より詳細には、連続
噴射型インクジェット記録装置において使用するインク
ジェットヘッドに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inkjet head, and more particularly to an inkjet head used in a continuous jet inkjet recording apparatus.

従来茨■ 第３図は、マルチオリフィスインクジェットヘッドのイ
ンク噴射状態を説明するための要部斜視図で、図中、１
はマルチオリフィスインクジェットヘッド、２はインク
ジェット、１０はオリフィスで、周知のように、インク
ジェットへラド１内のインクを加圧、励振してオリフィ
ス１０よりインクジェット２を噴射し、噴射されたイン
ク柱がインク滴に切断される時点でインク滴に印写情報
信号に応゛じて荷電し、例えば、荷電したインク滴を偏
向して記録紙等に衝突させて記録を行い、一方、荷電し
ないインク滴をガター等によって捕獲するものである。Conventional Ibara■ Figure 3 is a perspective view of the main parts for explaining the ink ejection state of a multi-orifice inkjet head.
1 is a multi-orifice inkjet head, 2 is an inkjet, and 10 is an orifice.As is well known, the ink in the inkjet head 1 is pressurized and excited to eject the inkjet 2 from the orifice 10, and the ejected ink column becomes ink. When the ink droplets are cut into droplets, they are charged according to the printing information signal, and, for example, the charged ink droplets are deflected and collided with a recording paper, etc. to perform recording, while the uncharged ink droplets are They are captured using gutter etc.

而して、第３図（ａ）は、記録中におけるインクジェッ
トの状態を示すが、記録時はインクジェットヘッド１内
のインク圧力が高いため、各オリフィスＩＯより噴射さ
れるインクジェット２は全て同じ方向を向いている。記
録停止時、インクジェットヘッド１内のインク圧を低下
させると、理想的には、各インクジェットは重力の方向
に徐々に下っていって停止するはずであるが、実際には
、（ｂ）図に２゛にて示すように、いろいろな方向を向
きながら停止し、ヘッド周辺、とりわけ、荷電電極を汚
し、リーク等を生じる原因となっていた。而して、上述
のようにインク噴射停止時にインク流がいろいろな方向
を向く原因は、オリフィス部にインクが付着しているこ
とに起因し、この付着インクの方向にインクジェットが
引きずられながら停止するためであり、このようなイン
クジェットの噴射方向の不揃いは、インクジェットの噴
射停止時ばかりでなく、開始時にも生じる。FIG. 3(a) shows the state of the inkjet during recording. Since the ink pressure inside the inkjet head 1 is high during recording, all the inkjet 2 ejected from each orifice IO are directed in the same direction. It's suitable. When recording is stopped, if the ink pressure inside the inkjet head 1 is reduced, each inkjet should ideally gradually descend in the direction of gravity and stop, but in reality, as shown in Figure (b). As shown in Fig. 2, the head stops facing in various directions, contaminating the area around the head, especially the charging electrode, and causing leakage. As mentioned above, the reason why the ink flow turns in various directions when ink jetting stops is due to ink adhering to the orifice, and the inkjet is dragged in the direction of this adhering ink when it stops. This is due to the fact that such irregularities in the jetting direction of the inkjet occur not only when the jetting of the inkjet is stopped but also when jetting is started.

旦追 本発明は、上述のごとき従来技術の欠点を解消゛するた
めになされたもので、特に、インク噴射開始時及び停止
時に、インクジェットがいつも同じ方向を向くようにし
たインクジェットヘッドを提供することを目的としてな
されたものである。SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the drawbacks of the prior art as described above, and in particular, to provide an inkjet head in which the inkjet always faces the same direction when starting and stopping ink jetting. This was done for the purpose of

１履 本発明は、上記目的を達成するため、インクジェットヘ
ッドを有し、該インクジェットヘッドのオリフィスより
インク滴を噴射して記録を行うインクジェット記録装置
において、前記オリフィスに非対称部を有することを特
徴としたものである。1. In order to achieve the above object, the present invention provides an inkjet recording apparatus that includes an inkjet head and performs recording by ejecting ink droplets from an orifice of the inkjet head, characterized in that the orifice has an asymmetrical part. This is what I did.

以下、本発明の実施例に基づいて説明する。Hereinafter, the present invention will be explained based on examples.

第１図（ａ）、　　（ｂ）は、それぞれ本発明によるイ
ンクジェットヘッドのオリフィス部正面拡大図で、図中
、１０はオリフィス、１１は該オリフィス１０を非対称
にするための凸部、１２は凹部で、このような非対称部
を例えばオリフィスの下側にすると、インクジェット噴
射開始時及び停止時に、オリフィスより噴射されるイン
ク滴は常に下側より立上がり、或いは、下側を向いて停
止する。なお、このようなオリフィスを作るには、例え
ば、フォトエツチング或いはフォトニレクロフォーミン
グ等のフォトリソ技術を用いて作る場合には、フォトマ
スクの段階で、真円のパターンを作るのではなく、上述
のごとき非対称のパターンにしておけばよい。FIGS. 1(a) and 1(b) are front enlarged views of the orifice portion of the inkjet head according to the present invention, in which 10 is the orifice, 11 is a convex portion to make the orifice 10 asymmetrical, and 12 is a concave portion. If such an asymmetrical portion is placed below the orifice, for example, the ink droplets ejected from the orifice will always rise from the bottom or stop facing the bottom when inkjet jetting starts and stops. Note that in order to make such an orifice, for example, when making it using photolithography technology such as photoetching or photonirecroforming, the above-mentioned method is used instead of making a perfect circular pattern at the photomask stage. You can use an asymmetrical pattern like this.

第１図（ｃ）は、本発明の他の実施例を説明するための
オリフィス部正面拡大図で、この実施例は、オリフィス
出口部の表面層を何らかの方法で。FIG. 1(c) is an enlarged front view of the orifice portion for explaining another embodiment of the present invention, and this embodiment has a surface layer of the orifice outlet portion in some way.

他の部分と変化させ（斜線部）、この変化部分に非対称
部１３を設けたものである。なお、表面層を変化させる
方法としては、前述のフォトリソ技術を用いてオリフィ
ス部表面をわずかにエツチング或いは蒸着を行えばよい
。It is made different from other parts (shaded part), and an asymmetrical part 13 is provided in this changed part. As a method for changing the surface layer, the surface of the orifice portion may be slightly etched or vapor-deposited using the aforementioned photolithography technique.

第２図は、オリフィス部断面図で、以上には、非対称部
をオリフィスの出口側つまり第２図においてＡ部に設け
た例を示したが、本発明は、上記実施例に限定されるも
のではなく、Ｂ部或いは０部に示すようなオリフィス内
部に設けてもよい。FIG. 2 is a sectional view of the orifice part, and the above example shows an example in which the asymmetrical part is provided on the exit side of the orifice, that is, in the section A in FIG. 2. However, the present invention is not limited to the above embodiment. Instead, it may be provided inside the orifice as shown in section B or section 0.

なお、以上には、本発明をマルチヘッドインクジェット
に適用する場合を想定して説明したが、本発明は、シン
グルヘッドインクジェットにも通用可能であることは容
易に理解できよう。Although the present invention has been described above assuming that it is applied to a multi-head inkjet, it is easy to understand that the present invention can also be applied to a single-head inkjet.

立米 以上の説明から明らかなように、本発明によると、イン
クジェットの噴射停止時、噴射開始時等にインクジェッ
トの乱れがなく、いつも希望する方向にインクジェット
を向かせて、停止、開始ができるため、ヘッド周辺の汚
れを防止することができ、とりわけ荷電電極の汚れを防
止でき、信頼性が向上する。As is clear from the above explanation, according to the present invention, there is no disturbance of the inkjet when jetting stops or when jetting starts, and the inkjet can always be stopped and started facing the desired direction. Contamination around the head can be prevented, and in particular, contamination of the charging electrode can be prevented, improving reliability.

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

第１図（ａ）〜（ｃ）は、それぞれ本発明によるインク
ジェットヘッドのオリフィス部正面拡大図、第２図は、
断面図、第３図は、マルチオリフィスインクジェットヘ
ッドのインクジェット噴射中及び噴射停止時の状態を説
明するための図である。 １・・・インクジェットヘッド、２・・・インクジェッ
ト。 １０・・・オリフィス、１１．１２．１３・・・非対称
部。1(a) to 1(c) are enlarged front views of the orifice portion of the inkjet head according to the present invention, and FIG. 2 is a
The cross-sectional view and FIG. 3 are diagrams for explaining the state of the multi-orifice inkjet head during inkjet ejection and when ejection is stopped. 1... Inkjet head, 2... Inkjet. 10... Orifice, 11.12.13... Asymmetrical part.

Claims (1)

【特許請求の範囲】[Claims] インクジェットヘッドを有し、該インクジェットヘッド
のオリフィスよりインク滴を噴射して記録を行うインク
ジェット記録装置において、前記オリフィスに非対称部
を有することを特徴とするインクジェットヘッド。An inkjet recording apparatus that includes an inkjet head and performs recording by ejecting ink droplets from an orifice of the inkjet head, characterized in that the orifice has an asymmetrical portion.
JP1502085A 1985-01-29 1985-01-29 Ink jet head Pending JPS61173947A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1502085A JPS61173947A (en) 1985-01-29 1985-01-29 Ink jet head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1502085A JPS61173947A (en) 1985-01-29 1985-01-29 Ink jet head

Publications (1)

Publication Number Publication Date
JPS61173947A true JPS61173947A (en) 1986-08-05

Family

ID=11877166

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1502085A Pending JPS61173947A (en) 1985-01-29 1985-01-29 Ink jet head

Country Status (1)

Country Link
JP (1) JPS61173947A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990077695A (en) * 1998-03-10 1999-10-25 디. 크레이그 노룬드 Inkjet printhead orifice plate having related orifices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990077695A (en) * 1998-03-10 1999-10-25 디. 크레이그 노룬드 Inkjet printhead orifice plate having related orifices

Similar Documents

Publication Publication Date Title
EP0206452B1 (en) Print head for ink jet printer
EP0467656B1 (en) Method of operating an on-demand ink jet print head
JP3255528B2 (en) Ink jet device
GB2267255A (en) ink-throttling arrangements in an ink-jet printer.
JPH05345425A (en) Recording cartridge, and ink jet recording apparatus
US5355158A (en) Ink jet apparatus and method of recovering ink jet head
JPS61173947A (en) Ink jet head
EP1241008B1 (en) Firing chamber geometry for inkjet printhead
JPS63252749A (en) Ink-on-demand type ink jet head
JPS59138467A (en) Liquid jet recording apparatus
JPS58142865A (en) Ink jet recorder
JPS6336951B2 (en)
JP2672340B2 (en) Liquid jet recording device
JP2582741Y2 (en) Inkjet printer head
JP2816987B2 (en) Droplet ejection device and droplet ejection method
JPS618357A (en) Dot printer
JPH03208661A (en) Ink jet recording head and manufacture thereof
JP2821927B2 (en) Method for removing ink mist of ink jet recording apparatus
JP3023259B2 (en) Ink cartridge and inkjet recording device
JPS60262660A (en) Ink jet recorder
JPS6087056A (en) Ink jet head
JPS6233075B2 (en)
JPH04257449A (en) Ink jet recording head
JPH08174832A (en) Ink-jet recording head
JPS60104333A (en) Liquid injection apparatus