JPH058107B2 - - Google Patents
Info
- Publication number
- JPH058107B2 JPH058107B2 JP59187335A JP18733584A JPH058107B2 JP H058107 B2 JPH058107 B2 JP H058107B2 JP 59187335 A JP59187335 A JP 59187335A JP 18733584 A JP18733584 A JP 18733584A JP H058107 B2 JPH058107 B2 JP H058107B2
- Authority
- JP
- Japan
- Prior art keywords
- ink
- slit
- slit member
- electrode
- image forming
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 claims description 23
- 239000007788 liquid Substances 0.000 description 9
- 230000005684 electric field Effects 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- B41J2/065—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field involving the preliminary making of ink protuberances
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、画像形成方法に関し、更に詳細に
は、画像信号に応じて、インクを記録紙上に飛翔
させて、画像を形成する画像形成方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an image forming method, and more particularly to an image forming method in which an image is formed by ejecting ink onto recording paper according to an image signal. Regarding.
（従来技術）
インクを使用しての画像形成は、粉体を用い
た、コントログラフイ・ゼログロフイと比較し
て、定着の工程が不用であり、またそれを実施す
る装置構成が簡易で小型化が可能であり、更に、
熱転写方式と比較すると、色再現が良好で、画質
が良く、印字エネルギーが少ない等の利点を有し
ている。(Prior art) Image formation using ink does not require a fixing process compared to powder-based contrastography and xerography, and the equipment used to perform it is simpler and more compact. is possible, and furthermore,
Compared to thermal transfer methods, it has advantages such as good color reproduction, good image quality, and less printing energy.
このインクを用いる画像形成方式としては、ノ
ズルから電荷を付与したインクを算出し、これを
信号電界によつて制御するインクジエツト方式
が、現在主流となつている。 Currently, the mainstream image forming method using this ink is an inkjet method in which charged ink is calculated from a nozzle and controlled by a signal electric field.
このインクジエツト方式は、ノズルを使用する
ために、インクの乾燥、異物の混入等によるノズ
ル目詰りを生じ、またノズルを高密度で実装でき
ない為に、ノズルあるいは記録紙を走査する必要
があり、印字速度が低下し、更に可動部分を有す
る為信頼性が低下するという欠点を有している。 Since this inkjet method uses nozzles, the nozzles may become clogged due to ink drying or foreign matter getting mixed in. Also, since the nozzles cannot be mounted in a high density, it is necessary to scan the nozzles or the recording paper, and printing It has the drawbacks of reduced speed and reduced reliability due to the presence of moving parts.
一方、ノズルをスリツト化し、対向電極に印字
信号を印加しインクに電荷を誘導して記録する方
式が提案されている。 On the other hand, a method has been proposed in which the nozzle is formed into a slit and a printing signal is applied to a counter electrode to induce charge in the ink for recording.
かかる方式においては従来のインクジエツトで
問題であつたノズルの目詰りの心配がなく、且
つ、電極を高密度で配列する事には走査の必要が
なくなるという利点を有するが、対向電極に印字
信号が印加されてから、電荷がインクに誘導され
て、インクの盛り上がりを生じ、しかる後にイン
クの飛翔を生じるという過程を経て、画素形成が
行なわれる為、応答が遅く、高密度での印字が難
しいという欠点を有している。 This method has the advantage that there is no need to worry about nozzle clogging, which was a problem with conventional ink jets, and the high density arrangement of electrodes eliminates the need for scanning. After being applied, a charge is induced into the ink, causing the ink to bulge, and then the ink to fly. Pixel formation occurs through this process, so the response is slow and high-density printing is difficult. It has its drawbacks.
この欠点を解消するため、インクとして、磁性
粉を分散した磁性インクを用い、インク供給側の
電極部に磁界を配して、磁器的にインクの盛り上
がりを形成しておく事により、印字信号に対する
記録の応答性を改良した方式も提案されている。 In order to eliminate this drawback, we use magnetic ink with magnetic powder dispersed in it, place a magnetic field on the electrode on the ink supply side, and form a bulge of ink in a magnetic manner. A method with improved recording responsiveness has also been proposed.
かかる方式においては、印字の応答性は改善さ
れるものの磁性インクに所望する色に着色する事
が難しく、カラー記録に使用できず、また分散し
た磁性粉の沈降磁気的凝集等により、経時安定性
を損うという問題を有している。 Although this method improves the responsiveness of printing, it is difficult to color the magnetic ink in the desired color, making it unusable for color recording, and the stability over time is poor due to sedimentation and magnetic aggregation of dispersed magnetic powder. It has the problem of damaging the
（発明の目的）
本発明は、以上述べた従来方法の問題点にかん
がみ、ノズルを用いることなく、高速度で、良好
な色再現性を有する画像記録を安定して行なこと
のできる画像形成方法を提供することも目的とす
るものである。(Object of the Invention) In view of the problems of the conventional methods described above, the present invention provides an image forming system capable of stably recording an image with good color reproducibility at high speed without using a nozzle. It is also an object to provide a method.
（発明の効果）
本発明は、１つ以上の電極をそれぞれ有する第
１及び第２の平板を微小な間隙を隔てて設けてな
るスリツト部材と、該スリツト部材端部に近接し
て配置された複数個の対向電極を備え、該スリツ
ト部材の前記間隙に導電性を有するインクを保持
し、前記対向電極に印字信号を印加し前記対向電
極の近傍に配置された記録紙上へ前記スリツトか
らインクを飛翔させて画像を形成する画像形成方
法であつて、前記スリツト部材に設けられた電極
に、前記印字信号印加前にあらかじめ電圧を印加
し、前記スリツト部材内に、インクの盛り上りを
形成することを特徴とするものである。なお、上
記スリツト部材内電極に印加する電圧極性は、前
記対向電極に印加する印字信号と逆極性に設定す
ることが望ましい。(Effects of the Invention) The present invention provides a slit member in which first and second flat plates each having one or more electrodes are provided with a small gap therebetween, and a slit member disposed close to the end of the slit member. A plurality of opposing electrodes are provided, conductive ink is held in the gap between the slit members, and a print signal is applied to the opposing electrodes to ink from the slit onto a recording paper disposed near the opposing electrodes. An image forming method in which an image is formed by flying ink, wherein a voltage is applied in advance to an electrode provided on the slit member before applying the print signal to form a bulge of ink within the slit member. It is characterized by: The polarity of the voltage applied to the electrode within the slit member is desirably set to be opposite to the polarity of the print signal applied to the counter electrode.
（実施例）
以下、添付図面を参照しつつ本発明の好ましい
実施例について説明する。(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
第１図は、本発明の画像形成方法を実施する画
像形成装置の構成を示す平面図である。 FIG. 1 is a plan view showing the configuration of an image forming apparatus that implements the image forming method of the present invention.
画像形成装置はスリツト部材１を備えており、
このスリツト部材１は、第２図に示されているよ
うに第１、第２の平板２，３を80μｍの間隔を隔
てて保持して形成されている。第１の平板２の内
面には、くし歯状に16本／mmの密度で電極４が並
設されており、第２の平板３の内面には全面に電
極５が設けられている。スリツト部材１の端部か
ら約300μｍの一定間隔を保ち、スリツト部材１
の開口部１ａに正対する位置に一列に配された対
向電極が配置されている。対向電極６は８本／mm
の密度で形成されており、各電極６が、信号印加
電源７に接続されている。この対向電極６とスリ
ツト部材１の間に記録紙８が配されている。 The image forming apparatus includes a slit member 1,
As shown in FIG. 2, this slit member 1 is formed by holding first and second flat plates 2 and 3 at an interval of 80 μm. On the inner surface of the first flat plate 2, electrodes 4 are arranged in a comb-like manner at a density of 16 electrodes/mm, and on the inner surface of the second flat plate 3, electrodes 5 are provided on the entire surface. Keeping a constant distance of about 300 μm from the end of the slit member 1,
Opposing electrodes arranged in a line are disposed at positions directly facing the openings 1a. Counter electrode 6 is 8 pieces/mm
Each electrode 6 is connected to a signal application power source 7. A recording paper 8 is arranged between the counter electrode 6 and the slit member 1.
スリツト部材１の間隙には、10-8Ucm-1の導電
率を有するインクＩが通常、液面がスリツト部材
端部に至らない状態で自身の界面張力で保持され
ている。 Ink I having a conductivity of 10 -8 Ucm -1 is normally held in the gap between the slit members 1 by its own interfacial tension, with the liquid level not reaching the ends of the slit members.
以上の構造において、電極４に、一本おきに電
源Ｖにより電圧を印加し、他の電極を接地するこ
とで接地と、電圧印加が交互に並ぶ様、電圧を印
加し、同時に電極５を設地しておくことによつ
て、電極４の電圧印加極周囲に電界を形成する。
この時スリツト内のインクＩは、電圧印加電極部
で液面の盛り上りIRが形成される。これは、イン
クの比誘電率が１より大きい為、高電界部にイン
クが引きつけられることにより生じる現象であつ
て、盛り上り量は、印加される電界の大きさ、イ
ンクの比誘電率、表面張力等によつて決定され
る。 In the above structure, a voltage is applied to every other electrode 4 by the power supply V, and the other electrodes are grounded so that the grounding and voltage application are alternately arranged, and at the same time, the electrode 5 is set. By keeping the electrode 4 grounded, an electric field is formed around the voltage application pole of the electrode 4.
At this time, the ink I in the slit forms a liquid level bulge I R at the voltage application electrode portion. This is a phenomenon that occurs when the ink is attracted to areas with a high electric field because the dielectric constant of the ink is greater than 1.The amount of swelling depends on the magnitude of the applied electric field, the dielectric constant of the ink, and the surface Determined by tension, etc.
本発明に用いるインクは、電荷を誘導するに足
る導電率を有していれば良く、水性、油性いずれ
であつても良い。 The ink used in the present invention may be either water-based or oil-based as long as it has sufficient electrical conductivity to induce charge.
インクの表面張力は小さい程、***の振幅が大
きくなり好ましいが、通常のインク程度（30〜
80dyn／cm）であれば問題はない。 The smaller the surface tension of the ink, the larger the amplitude of the bumps, which is preferable.
80dyn/cm), there is no problem.
又、スリツト部材１に設ける電極は、第１図お
よび第２図に示すものに限定されるものではな
く、第３図の如く、先端に切り込み１０を入れた
形状や、第４図の如きスリツト部材１の２つの内
面にクシ歯をもうけた形状であつても良く、対向
電極に対応したインク液の***を形成できるもの
であれば良い。 Further, the electrodes provided on the slit member 1 are not limited to those shown in FIGS. 1 and 2, but may have a shape with a notch 10 at the tip as shown in FIG. 3, or a slit shape as shown in FIG. The member 1 may have a shape in which comb teeth are provided on the two inner surfaces thereof, and any shape that can form a bulge of ink liquid corresponding to the counter electrode may be used.
更に、第５図に示すようにスリツト部材１の電
極４を設けた部分を突出させ、電界による***の
形成を、インクの界面張力によつてアシストする
ことも有効である。 Furthermore, it is also effective to make the portion of the slit member 1 provided with the electrode 4 protrude as shown in FIG. 5, and to assist the formation of the protuberance caused by the electric field by the interfacial tension of the ink.
又、インクの導電率が高く、スリツト部材から
のリークが大きい場合には、スリツト電極の一方
を絶縁あるいは高抵抗材料で被覆する事によつ
て、動作に支障をきたすことなく上記リークを防
止する事が出来る。 In addition, if the ink has high conductivity and leakage from the slit member is large, one side of the slit electrode can be insulated or coated with a high-resistance material to prevent the leakage without interfering with operation. I can do things.
図に示す装置で、スリツト部材１の電極４に−
200V印加したところ、50μｍ程の***が、電圧印
加電極部に形成された。この状態で、対向電極６
を各々、前述のインク液面の***に正対する位置
に合せ、500V、300μscの短形波からなる印字信
号電圧を画像情報に応じて、対向電極に印加した
所、印加信号に対応して、インク液面の***部よ
り、インク滴が飛翔し、記録紙８上に、φ150μｍ
程の略円形の画素が形成された。 With the device shown in the figure, the electrode 4 of the slit member 1 is
When 200V was applied, a bump of about 50 μm was formed on the voltage application electrode. In this state, the counter electrode 6
were positioned directly opposite to the above-mentioned bumps on the ink liquid surface, and a printing signal voltage consisting of a rectangular wave of 500 V and 300 μsc was applied to the counter electrode according to the image information. Ink droplets fly from the raised part of the ink liquid surface and appear on the recording paper 8 with a diameter of 150 μm.
Approximately circular pixels were formed.
次に、スリツト部材１の電極４に印加する電圧
を＋200にした所、先と同様の盛り上りは形成さ
れたが、対向電極に500V、300μsecの印字信号を
印加してもインクの飛翔は生じず、インクの飛翔
を行なう為には、700V、500μsecの印字信号を必
要とした。 Next, when the voltage applied to the electrode 4 of the slit member 1 was increased to +200, the same bulge as before was formed, but even if a 500 V, 300 μsec printing signal was applied to the counter electrode, ink did not fly. First, in order to make the ink fly, a printing signal of 700V and 500μsec was required.
これは、対向電極とスリトとの間の電界が小さ
くなつた事と、スリツト電極部にあらかじめ、誘
導されていた、正極性の電荷を中和する事に起因
すると考えられる。 This is thought to be due to the fact that the electric field between the counter electrode and the slit became smaller and that the positive charges that had been previously induced in the slit electrode were neutralized.
更に、スリツト電極を接地した所、インクの飛
翔に要する印加信号は、３ｍsec以上必要とした。 Furthermore, when the slit electrode was grounded, the applied signal required for the ink to fly was required to be 3 msec or more.
スリツト部材１の電極４の部分にあらかじめ隆
起が形成されていない。かかる状態からは、大別
して(i)インク内に電荷を誘導する、(ii)誘導電荷に
加わる静電引力で液面に***を形成する、(iii)***
が伸長し、インク滴を形成して飛翔する、という
過程を経て記録が行なわれるのであるが、主とし
て(ii)の液面を***させる過程に要する時間の為
に、印加信号のパルス巾を広く取らねばならない
ものと考えられる。 No protuberance is formed in advance on the electrode 4 portion of the slit member 1. These conditions can be broadly classified into (i) induction of electric charges within the ink, (ii) formation of ridges on the liquid surface due to electrostatic attraction applied to the induced charges, and (iii) expansion of the ridges to form ink droplets. Recording is performed through the process of raising the liquid level, and it is thought that the pulse width of the applied signal must be wide, mainly due to the time required for the process (ii) of raising the liquid level.
（発明の効果）
前述した如く、本発明においては、スリツト部
材内のインクに、あらかじめ***を形成しておく
事によつて、記録に要する印加信号巾を大巾に短
縮する事が出来、高速度の画像形成が可能とな
る。(Effects of the Invention) As described above, in the present invention, by forming ridges in advance in the ink inside the slit member, the width of the applied signal required for recording can be greatly shortened, and the width of the applied signal required for recording can be greatly reduced. This enables high-speed image formation.
更に、該スリツト内の***の形成をスリツト内
に配した電極に、印字信号と逆の極性の電圧を印
加し、て行うことによつてインク内にあらかじめ
電荷が誘導されている状態にある為一層高速度の
記録が行なえるばかりでなく、スリツトと対向電
極間の電界が強められ、対向電極に印加する信号
電圧を低くする事が出来、駆動回路の簡易化、小
型化、及び高信頼性化がなされる効果も有する。 Furthermore, by applying a voltage with the opposite polarity to the printing signal to an electrode arranged in the slit to form a protrusion within the slit, a charge is induced in the ink in advance. Not only can higher-speed recording be performed, but the electric field between the slit and the counter electrode is strengthened, and the signal voltage applied to the counter electrode can be lowered, making the drive circuit simpler, smaller, and more reliable. It also has the effect of creating a
又、従来インクを用いた、記録方法において
は、温度等の変化による粘性の変動により、動作
の安定性が損なわれていたが、本発明においては
インク液の***があらかじめ形成されている為、
粘性の効果は小さく、安定した記録を行なうこと
ができる。この様に、インク物性に対する制限が
広い為、色再現を重視してインク材料を選択する
事が可能であり、良好な画像を得る事が出来る。 In addition, in conventional recording methods using ink, the stability of operation was impaired due to fluctuations in viscosity due to changes in temperature, etc., but in the present invention, since the ink liquid bulges are formed in advance,
The effect of viscosity is small and stable recording can be performed. In this way, since there are wide restrictions on ink physical properties, it is possible to select ink materials with emphasis on color reproduction, and it is possible to obtain good images.
又本発明はスリツト部材内にインクを保持して
おりノズルを使用しない為、インクの乾燥や異物
の混入によりる目詰りが発生しにくく、動作の信
頼性は、ノズルを用おる記録方法に比べはるかに
高い。 Furthermore, since the present invention retains ink within the slit member and does not use a nozzle, clogging due to ink drying or foreign matter is less likely to occur, and operation reliability is higher than that of recording methods that use nozzles. much higher.
第１図は、本発明による画像形成方法を実施す
るための画像形成装置を示す平面図、第２図は、
第１図に示した装置におけるスリツト部材の構造
を示す斜視図、第３図、第４図、および第５図
は、上記スリツト部の変形例を示す図である。
１……スリツト部材、２，３……平板、４，５
……電極、６……対向電極、Ｖ……電源、Ｉ……
インク、IR……インクの盛り上り。
FIG. 1 is a plan view showing an image forming apparatus for carrying out the image forming method according to the present invention, and FIG.
A perspective view showing the structure of the slit member in the apparatus shown in FIG. 1, and FIGS. 3, 4, and 5 are views showing modifications of the slit portion. 1... Slit member, 2, 3... Flat plate, 4, 5
...Electrode, 6...Counter electrode, V...Power supply, I...
Ink, IR ...The rise of ink.
Claims (1)
２の平板を微少な間〓を隔てて設けてなるスリツ
ト部材と、該スリツト部材端部に近接して配置さ
れた複数個の対向電極を備え、該スリツト部材の
前記間〓に導電性を有するインクを保持し、前記
対向電極に印字信号を印加し前記対向電極の近傍
に配置された記録紙上へ前記スリツトからインク
を飛翔させて画像を形成する画像形成方法であつ
て、前記スリツト部材に設けられた電極に、前記
印字信号印加前にあらかじめ電圧を印加し、前記
スリツト部材内に、インクの盛り上りを形成する
ことを特徴とする画像形成方法。 ２ 前記スリツト部材内電極に印加する電圧極性
を、前記対向電極に印加する印字信号と逆極性と
したことを特徴とする特許請求の範囲第１項記載
の画像形成方法。[Claims] 1. A slit member formed by first and second flat plates each having one or more electrodes separated by a small distance, and a plurality of slit members disposed close to the end of the slit member. The slit member is provided with a plurality of opposing electrodes, holds conductive ink between the slit members, applies a print signal to the opposing electrodes, and transfers the ink from the slit onto a recording paper placed near the opposing electrodes. An image forming method in which an image is formed by flying ink, wherein a voltage is applied in advance to an electrode provided on the slit member before applying the print signal to form a bulge of ink within the slit member. An image forming method characterized by: 2. The image forming method according to claim 1, wherein the polarity of the voltage applied to the electrode within the slit member is opposite to that of the print signal applied to the counter electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18733584A JPS6164456A (en) | 1984-09-07 | 1984-09-07 | Formation of image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18733584A JPS6164456A (en) | 1984-09-07 | 1984-09-07 | Formation of image |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6164456A JPS6164456A (en) | 1986-04-02 |
| JPH058107B2 true JPH058107B2 (en) | 1993-02-01 |
Family
ID=16204194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18733584A Granted JPS6164456A (en) | 1984-09-07 | 1984-09-07 | Formation of image |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6164456A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4719476A (en) * | 1986-04-17 | 1988-01-12 | Xerox Corporation | Spatially addressing capillary wave droplet ejectors and the like |
| US4719480A (en) * | 1986-04-17 | 1988-01-12 | Xerox Corporation | Spatial stablization of standing capillary surface waves |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4962024A (en) * | 1972-09-29 | 1974-06-15 | ||
| JPS56167466A (en) * | 1980-05-30 | 1981-12-23 | Nippon Telegr & Teleph Corp <Ntt> | Ink jet recorder |
-
1984
- 1984-09-07 JP JP18733584A patent/JPS6164456A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4962024A (en) * | 1972-09-29 | 1974-06-15 | ||
| JPS56167466A (en) * | 1980-05-30 | 1981-12-23 | Nippon Telegr & Teleph Corp <Ntt> | Ink jet recorder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6164456A (en) | 1986-04-02 |
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