JPH04126255A - Ink jet head - Google Patents
Ink jet headInfo
- Publication number
- JPH04126255A JPH04126255A JP24841390A JP24841390A JPH04126255A JP H04126255 A JPH04126255 A JP H04126255A JP 24841390 A JP24841390 A JP 24841390A JP 24841390 A JP24841390 A JP 24841390A JP H04126255 A JPH04126255 A JP H04126255A
- Authority
- JP
- Japan
- Prior art keywords
- ink
- permanent magnet
- return spring
- electromagnetic coil
- forming member
- 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
Links
- 238000006073 displacement reaction Methods 0.000 abstract description 10
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、イｌり滴を吐出させ記録紙等の記録媒体上に
インク像を形成するプリンタ等に使用するインクジェッ
トヘッドに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inkjet head used in printers and the like that ejects droplets to form an ink image on a recording medium such as recording paper.
特公昭６０−８９５５号公報等に開示されている従来の
インクジェットヘッドの構造は、第５図に示すように紙
面厚さ方向に配置された複数のノズル開口１００を有す
るノズル形成部材１０１と、その背後に配置されインク
と直接接触する振動体１０２を具備するものである。そ
して振動体として圧電材が用いられている。このような
インクジェットヘッドでは、振動体１０２がノズル形成
部材１０１０法線方向に変位するとと（振動する。そし
て各ノズル開口１００間のインク流路が短い距離で通じ
ていることにより、インク滴吐出効率及び安定性が高く
、インク中に気泡、ゴミ等の異物が混入した場合でもこ
れらの影響を受けることな（正常に動作を維持できると
いう特徴を有する。The structure of a conventional inkjet head disclosed in Japanese Patent Publication No. 60-8955 and the like includes a nozzle forming member 101 having a plurality of nozzle openings 100 arranged in the thickness direction of the paper, as shown in FIG. It is equipped with a vibrating body 102 which is placed behind and comes into direct contact with the ink. A piezoelectric material is used as the vibrating body. In such an inkjet head, when the vibrating body 102 is displaced in the normal direction of the nozzle forming member 1010, it vibrates.The ink flow path between each nozzle opening 100 communicates over a short distance, thereby improving the ink droplet ejection efficiency. It has a high stability and is characterized by being able to maintain normal operation without being affected by foreign matter such as air bubbles or dust mixed into the ink.
しかしながら、従来のインクジェットヘッドでは、振動
体１０２の特性上微少な変位しか発生せず、この変位で
インクを吐出させるため、インク滴１０５に知見られる
エネルギーが小さい。このため、所定の吐出特性を得る
ためには、ノズル形成部材１０１から振動体１０２まで
の距離を厳密に作り込む必要があり、生産性が低（イン
ク吐出特性も不安定であるという問題を有していた。However, in the conventional inkjet head, only a small displacement occurs due to the characteristics of the vibrating body 102, and ink is ejected by this displacement, so that the energy found in the ink droplet 105 is small. Therefore, in order to obtain predetermined ejection characteristics, it is necessary to precisely set the distance from the nozzle forming member 101 to the vibrating body 102, resulting in low productivity (and unstable ink ejection characteristics). Was.
本発明の目的は、以上のような従来のインクジェットヘ
ッドにおける問題点を解決し、エネルギー効率、生産性
の向上を図ると共に、インク吐出特性を安定させること
にある。An object of the present invention is to solve the above-mentioned problems with conventional inkjet heads, to improve energy efficiency and productivity, and to stabilize ink ejection characteristics.
上記目的を達成するために、本発明のインクジェットヘ
ッドは、記録媒体に対向するように配置した１個または
複数個のノズル開口を有するノズル形成部材と電磁コイ
ルとを具備し、ノズル形成部材と電磁コイルとの間がイ
ンクで満たされ、電磁コイルの端部に永久磁石と復帰ば
ねとを積層して搭載したことを特徴とする。In order to achieve the above object, an inkjet head of the present invention includes an electromagnetic coil and a nozzle forming member having one or more nozzle openings arranged to face a recording medium. The space between the electromagnetic coil and the coil is filled with ink, and a permanent magnet and a return spring are stacked and mounted on the end of the electromagnetic coil.
以下に本発明の詳細を実施例に基づいて説明する。 The details of the present invention will be explained below based on examples.
第１図は、本発明によるインクジェットヘッドを用いた
プリンタの斜視図である。図中１は記録媒体で、プラテ
ン４に巻き付けられ送りロー２２．５によって押圧され
る。ガイド軸６．７に案内され、プラテン軸と平行方向
１０に＃動可能なキャリッジ８上にインクジェットヘッ
ド９が搭載されている。インクジェットヘッド９は、後
述するように外部からの駆動電圧を印加することによっ
て独立にインク滴を吐出制御可能な複数のノズル開口を
有している。インクジェットヘッド９は、プラテン軸方
向１０に走査され、ノズル開口から選択的にインク滴を
吐出し、記録媒体１上にインク像を形成する。記録媒体
１は、プラテン４、送りローラ２，５の回転により走査
方向と直行する副走査方向５に搬送され、記録媒体１上
への印字が行われる。FIG. 1 is a perspective view of a printer using an inkjet head according to the present invention. In the figure, reference numeral 1 denotes a recording medium, which is wound around the platen 4 and pressed by the feed row 22.5. An inkjet head 9 is mounted on a carriage 8 that is guided by a guide shaft 6.7 and is movable in a direction 10 parallel to the platen axis. The inkjet head 9 has a plurality of nozzle openings that can be independently controlled to eject ink droplets by applying an external drive voltage, as will be described later. The inkjet head 9 is scanned in the platen axis direction 10, selectively ejects ink droplets from nozzle openings, and forms an ink image on the recording medium 1. The recording medium 1 is conveyed in a sub-scanning direction 5 perpendicular to the scanning direction by rotation of the platen 4 and feed rollers 2 and 5, and printing is performed on the recording medium 1.
第２図は本発明によるインクジェットヘッドの第１の実
施例を示す断面図である。FIG. 2 is a sectional view showing a first embodiment of an inkjet head according to the present invention.
第１のベース１４に電磁コイル１５と第２のベース１９
とを積層して固定し、電磁コイル１５のノズル形成部材
１６に対向する側の端面上部に永久磁石１２を搭載し、
第１のベース１４と第２のベース１９の端面部にスペー
サ１８と復帰ばね１１とノズル形成部材１７とを積層し
て固定しキャビティ部２２を形成する。そして、キャビ
ティ部２２とフレーム２０とを固定してインクジェット
ヘッドを構成しである。ノズル形成部材１７は複数のノ
ズル開口１６を有しており、電磁石１３はそれぞれのノ
ズル開口１６に対向するよう各々独立に配置されている
。永久磁石１２は、常時は復帰ばね１１のバネ力により
電磁コイル１５の端面上部に押圧されている。インク２
１は、フレーム２０の外部より供給されノズル開口１６
まで満たされている。An electromagnetic coil 15 and a second base 19 are attached to the first base 14.
are stacked and fixed, and a permanent magnet 12 is mounted on the upper end surface of the electromagnetic coil 15 on the side facing the nozzle forming member 16,
A spacer 18, a return spring 11, and a nozzle forming member 17 are stacked and fixed on the end surfaces of the first base 14 and the second base 19 to form a cavity portion 22. Then, the cavity portion 22 and the frame 20 are fixed to form an inkjet head. The nozzle forming member 17 has a plurality of nozzle openings 16, and the electromagnets 13 are independently arranged to face each nozzle opening 16. The permanent magnet 12 is normally pressed against the upper end surface of the electromagnetic coil 15 by the spring force of the return spring 11. ink 2
1 is supplied from the outside of the frame 20 and is connected to the nozzle opening 16.
It's filled to the max.
本実施例では、永久磁石１２の材料としてフェライト磁
石を用いた。In this embodiment, a ferrite magnet was used as the material for the permanent magnet 12.
電磁コイル１５への駆動電圧は、１電源１５よりの電気
パルスにて印加するム
次に第４図（ａ）〜Ｃｄ）のインク滴吐出の過程図に基
づいて、インク滴の吐出動作を説明する（α）は動作を
していない初期状態を示す。The drive voltage to the electromagnetic coil 15 is applied as an electric pulse from the power source 15. Next, the ink droplet ejecting operation will be explained based on the process diagram of ink droplet ejecting in FIGS. 4(a) to Cd). Yes (α) indicates an initial state of no operation.
Ｃｂ）は電磁コイル゛１３に駆動電圧を印加して磁場を
形成し、この磁場により永久磁石、１２が反発力を受け
、矢印２４方向に永久磁石１２と復帰ばね１１がインク
中で変位し、インク滴２５の頭部がノズル開口１６より
出た状態を示す。Cb) applies a driving voltage to the electromagnetic coil 13 to form a magnetic field, the permanent magnet 12 receives a repulsive force due to this magnetic field, and the permanent magnet 12 and the return spring 11 are displaced in the ink in the direction of the arrow 24, The head of the ink droplet 25 is shown emerging from the nozzle opening 16.
（Ｃ）は永久磁石１２と復帰ばね１１とが（ｂ）よりさ
らに変位し、ノズル形成部材１７に近接または衝突し、
インク２１のノズル開口１６からの流出が阻止されイン
ク滴２５０尾部がノズル開口１６より離れ、インクＷ４
２５が記録媒体１に向かって吐出している状態を示す。In (C), the permanent magnet 12 and the return spring 11 are further displaced than in (b) and approach or collide with the nozzle forming member 17,
The ink 21 is prevented from flowing out from the nozzle opening 16, and the tail of the ink droplet 250 is separated from the nozzle opening 16, and the ink W4
25 shows a state in which the liquid is being ejected toward the recording medium 1.
（ｄ）は復帰ばね１１のばね力により、永久磁石１２が
矢印２５方向に変位して初期状ｍ（ａ）に復帰する過程
を示す。(d) shows a process in which the permanent magnet 12 is displaced in the direction of arrow 25 by the spring force of the return spring 11 and returns to the initial state m(a).
以上のように、電磁コイル１３に選択的に駆動電圧を印
加して振動させ、（α）〜Ｃｄ）の動作過程を繰り返す
ことにより、インク滴２５はノズル開口１６より選択的
に吐出する。As described above, the ink droplets 25 are selectively ejected from the nozzle openings 16 by selectively applying a driving voltage to the electromagnetic coil 13 to cause it to vibrate and repeating the operating steps (α) to Cd).
本実施例によるインクジェットヘッドの構成においては
、前述のインク滴の吐出動作で説明したごと（、電磁コ
イル１５により形成された磁場の反発力によって永久磁
石１２と復帰ばね１１とを変位させる。In the configuration of the inkjet head according to this embodiment, the permanent magnet 12 and the return spring 11 are displaced by the repulsive force of the magnetic field formed by the electromagnetic coil 15, as described in the above-mentioned ink droplet ejection operation.
この永久磁石１２と復帰ばね１１との変位量は、電磁コ
イル１５に印加される駆動電圧と、永°久磁石１２の重
さと、復帰ばね１１のばね力との調整により任意に設定
し得え、またインク中の変位時に永久磁石１２と復帰ば
ね１１とを拘束する復帰ばね１１のばね力は、永久磁石
１２を復帰させ／
るに足りる微少な大きさでよいため、永久磁石１２と復
帰ばね１１の変位量はインクを吐出させるに十分な適正
量を容易に設定し取り出し得る。そのため、必要な吐出
特性を得るためのノズル形成部材１７までの距ｊｌｌｉ
Ｌ（第２図参照）の許容値の幅が太き（なる。従って、
製造時の管理限界値を大きくとることが出来る。また、
第５図（Ｃ）に示すように、永久磁石１２と復帰ばね１
１とはノズル形成部材１７に近接または衝突するため、
ノズル開口１６に流入するインク蓋を制御でき、従来の
インクジェットヘッドでは不可避だったサテライ）１０
４（第５図参照）の発生を抑止することができる。The amount of displacement between the permanent magnet 12 and the return spring 11 can be set arbitrarily by adjusting the drive voltage applied to the electromagnetic coil 15, the weight of the permanent magnet 12, and the spring force of the return spring 11. In addition, the spring force of the return spring 11 that restrains the permanent magnet 12 and the return spring 11 during displacement in the ink may be small enough to return the permanent magnet 12. The amount of displacement 11 can be easily set to an appropriate amount sufficient to eject ink and can be taken out. Therefore, the distance to the nozzle forming member 17 to obtain the necessary ejection characteristics is
The range of allowable values for L (see Figure 2) is wide (therefore,
It is possible to set a large control limit value during manufacturing. Also,
As shown in FIG. 5(C), the permanent magnet 12 and the return spring 1
1 means that it is close to or collides with the nozzle forming member 17;
It is possible to control the ink lid that flows into the nozzle opening 16, and it is possible to control the ink lid that flows into the nozzle opening 16, which is unavoidable with conventional inkjet heads) 10
4 (see FIG. 5) can be prevented from occurring.
本実施例の永久磁石１２の材料は前述したものに限定さ
れるものでな（、アルニコ磁石、稀土類磁石等の他の磁
石材料も用いることが出来る。The material of the permanent magnet 12 of this embodiment is not limited to those mentioned above (other magnet materials such as alnico magnets and rare earth magnets can also be used).
また永久磁石１２の形状は、球、立方体、直方体、円柱
、円錐体等任意の形状にしてもよいが、インク中の変位
時の抵抗を低減しインク吐出応答性をよくするため、球
状等平滑面で構成する方が好ましい。The shape of the permanent magnet 12 may be any shape such as a sphere, a cube, a rectangular parallelepiped, a cylinder, or a cone. It is preferable to configure it with a surface.
第４図は、本発明の第２の実施例を示すインクジェット
ヘッドのキャビティ部の構成を示す断面図である。本実
施例では、永久磁石１２の変位方向に対し直角方向にイ
ンク滴２３を吐出するように構成されている。FIG. 4 is a sectional view showing the configuration of a cavity portion of an inkjet head showing a second embodiment of the present invention. In this embodiment, the ink droplets 23 are ejected in a direction perpendicular to the direction in which the permanent magnet 12 is displaced.
電磁石１３を内蔵した第１のベース１４に、永久磁石１
２と復帰ばね１１と第２のベース１９とを積層して固定
し、第１のベース１４と第２のベース１９の端面にノズ
ル形成部材１７を固定してキャビティ一部を形成する。A permanent magnet 1 is attached to a first base 14 that has a built-in electromagnet 13.
2, the return spring 11, and the second base 19 are stacked and fixed, and the nozzle forming member 17 is fixed to the end surfaces of the first base 14 and the second base 19 to form a part of the cavity.
インク吐出動作は第２図の実施例と同じである本実施例
の構造を取ることによって、各ノズル開口１６間の距離
に影響されずに矢印２６方向に永久磁石１２０寸法を任
意に設定し得るため、第２図の実施例の場合より設計の
自由度が萬くまた大きなインク滴を吐出することが出来
る。The ink ejecting operation is the same as the embodiment shown in FIG. 2. By adopting the structure of this embodiment, the dimensions of the permanent magnet 120 can be arbitrarily set in the direction of the arrow 26 without being affected by the distance between the nozzle openings 16. Therefore, there is a greater degree of freedom in design than in the embodiment shown in FIG. 2, and larger ink droplets can be ejected.
本発明によれば、永久磁石と復帰ばねの変位量は、永久
磁石の重さと復帰ばねの調整により容易に設定し得るた
め設計の自由度が高（、また微少な駆動電圧でインク吐
出に必要な永久磁石と復帰ばねとの変位を得るこ１とが
出来るため、エネルギー効率のよいインクジェットヘッ
ドを提供できるまた、永久磁石と復帰ばねの変位は従来
構造に比較し、より十分大きな変位となってインク滴を
吐出する。このため、従来構造ではノズル形成部材から
振動体までの距離を厳密に作り込む必要があったのに対
し、本発明によれば、ノズル形成部材から電磁コイルま
での距離の管理限界値を太き（とることができる。よっ
て、歩留りの高い生産性のよいヘッドを得ると共に良好
なインク滴吐出特性が得られる。According to the present invention, the amount of displacement of the permanent magnet and the return spring can be easily set by adjusting the weight of the permanent magnet and the return spring, so there is a high degree of freedom in design (and a very small drive voltage is required for ink ejection). Since it is possible to obtain a displacement between the permanent magnet and the return spring, it is possible to provide an inkjet head with good energy efficiency.In addition, the displacement between the permanent magnet and the return spring is sufficiently large compared to the conventional structure. Ink droplets are ejected.For this reason, in the conventional structure, it was necessary to precisely set the distance from the nozzle forming member to the vibrating body, but according to the present invention, the distance from the nozzle forming member to the electromagnetic coil has to be precisely set. The control limit value can be set to a large value. Therefore, a head with high yield and good productivity can be obtained, and good ink droplet ejection characteristics can be obtained.
第１図は本発明によるインクジェットヘッドを用いたプ
リンタの斜視図。第２図は本発明によるインクジェット
ヘッドの第１の実施例を示す断面図。第６図（α）〜（
ｄ）はインク滴吐出の過程図。第４図は本発明によるイ
ンクジェットヘッドの第２の実施例を示す要部断面図。
第５図は従来のインクジェットヘッドの構造を示す図。
１・・・・・・・・・記録媒体
３・・・・・・・・・プラテン
９・・・・・・・・・インクジェットヘッドト・・・・
・・・・復帰ばね
２・・・・・・・・・永久磁石
５・・・・・・・・・電磁コイル
６・・・・・・・・・ノズル開口
ア・・・・・・・・・ノズル形成部材
６・・・・・・・・・インク滴FIG. 1 is a perspective view of a printer using an inkjet head according to the present invention. FIG. 2 is a sectional view showing a first embodiment of an inkjet head according to the present invention. Figure 6 (α) - (
d) is a process diagram of ink droplet ejection. FIG. 4 is a sectional view of a main part showing a second embodiment of an inkjet head according to the present invention. FIG. 5 is a diagram showing the structure of a conventional inkjet head. 1... Recording medium 3... Platen 9... Inkjet head...
...Return spring 2...Permanent magnet 5...Electromagnetic coil 6...Nozzle opening a... ... Nozzle forming member 6 ... Ink droplet
Claims (1)
ノズル開口を有するノズル形成部材と電磁コイルとを具
備し、ノズル形成部材と電磁コイルとの間がインクで満
たされ、電磁コイルの端部に永久磁石と復帰ばねとを積
層して搭載したことを特徴とするインクジェットヘッド
。A nozzle forming member having one or more nozzle openings arranged to face a recording medium and an electromagnetic coil are provided, a space between the nozzle forming member and the electromagnetic coil is filled with ink, and an end portion of the electromagnetic coil is provided. An inkjet head characterized by being equipped with a permanent magnet and a return spring laminated together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24841390A JPH04126255A (en) | 1990-09-18 | 1990-09-18 | Ink jet head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24841390A JPH04126255A (en) | 1990-09-18 | 1990-09-18 | Ink jet head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04126255A true JPH04126255A (en) | 1992-04-27 |
Family
ID=17177751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24841390A Pending JPH04126255A (en) | 1990-09-18 | 1990-09-18 | Ink jet head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04126255A (en) |
Cited By (80)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0999934A1 (en) * | 1997-07-15 | 2000-05-17 | Silver Brook Research Pty, Ltd | A thermally actuated ink jet |
| EP0999933A1 (en) * | 1997-07-15 | 2000-05-17 | Silverbrook Research Pty. Limited | Magnetic-field-acutated ink jet nozzle |
| US6746105B2 (en) | 1997-07-15 | 2004-06-08 | Silverbrook Research Pty. Ltd. | Thermally actuated ink jet printing mechanism having a series of thermal actuator units |
| US6776476B2 (en) | 1997-07-15 | 2004-08-17 | Silverbrook Research Pty Ltd. | Ink jet printhead chip with active and passive nozzle chamber structures |
| US6783217B2 (en) | 1997-07-15 | 2004-08-31 | Silverbrook Research Pty Ltd | Micro-electromechanical valve assembly |
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