JPH03161352A - Generation of ink mist - Google Patents
Generation of ink mistInfo
- Publication number
- JPH03161352A JPH03161352A JP30144689A JP30144689A JPH03161352A JP H03161352 A JPH03161352 A JP H03161352A JP 30144689 A JP30144689 A JP 30144689A JP 30144689 A JP30144689 A JP 30144689A JP H03161352 A JPH03161352 A JP H03161352A
- Authority
- JP
- Japan
- Prior art keywords
- ink
- mist
- ink mist
- printing
- solution
- 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
- 239000003595 mist Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 230000014759 maintenance of location Effects 0.000 claims 1
- 238000009826 distribution Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Ink Jet (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、ノンインパクト印写装置のインク発生部分に
関する．更に詳しくは現像時に、ミスト状のインクを被
転写媒体上に選択的に付着させる事により、文字・画像
を得る印写装置のミスト発生機構に関する．
〔従来の技術〕
近年、情報産業の発展に伴い高速、高画質また無騒音の
ノンインパクト印写方式の複写機、プリンタ、ファクシ
ミリ等の情報・画像出力装置の必要性が急速に高まって
いる．
これらの必要性を満たす画像出力装置の一方式としてイ
ンクミストく霧状インク）を用いた画像記録方法が知ら
れている．具体的には、針電極と背面電極との間の被転
写媒体上に静電潜像を形成し、帯電インクミストを形成
させる方法．２番目としてイオンの通過をアパーチャボ
ードで制御し、選択的にインクミストを付着させる方法
．３番目として感光体上に光信号を照射して静電潜像を
形成し、被転写媒体を接触させ、帯電インクミストを静
電気的に付着させる方法．４番目とじてに画像信号に応
じて超音波振動針の先端より超音波エネルギーを付与し
て局所的に帯電インクミストを発生させ加速電界を印加
し、被転写媒体に付着させる方法等がある．
これらの印写原理に用いるインクミスト発生方法は、イ
ンク溶液を超音波で振動させるか、もしくはノズルから
高速度で噴出させ壁に衝突させることによりインクミス
トを発生させる方法であった．
［発明が解決しようとする課題及び目的］しかし、従来
のインクミスト発生方法は、高速化を可能にするために
必要な十分なインクミストを発生させることが出来ない
．また、インクミストの粒子径分布が広いため高印字品
質・高画質が得られない．等の問題点があった．また特
に、超音波振動を用いる方式においては、ミスト発生の
為の振動エネルギーが時間とともに熱エネルギーに変換
される効率が高くなりインクミストの安定供給が出来な
い、イニシャルコストが高い等の問題点があった．
そこで本発明はかかる問題点を解決するｋめになされた
もので、その目的とするところは、インク溶液を大量に
かつ粒径が整ったインクミストを発生させ、高速印刷・
高濃度・高画質印刷を可能にするインクミスト発生方法
を提供するところにある．
【！！題を解決するための手段］
本発明のインクミスト発生方法は、画像記録用インクを
霧化させ、発生したインクミストを被転写媒体上に選択
的に付着させて記録を行う印写装置において、ミスト発
生部に編み目構造の液体保持膜を持ち、これにインク溶
液を吸着叉は付着させ、該液体保持膜を振動させること
によりインクミストを発生することを特徴とする．
［ 作用 ］
本発明の上記構成によるインクミスト発生作用を説明す
る．第１図は本発明のインクミスト発生機構に用いる編
み目構造の液体保持膜の一部分の拡大図である．繊維状
物質１１で編み目状に編まれており（以下付着膜と呼称
する）インク溶液が供給された場合毛細管現象の働きに
より図の空孔部にインク１１１３が蓄積される．これに
振動を与えることにより、空孔部分に蓄えられていたイ
ンク滴がインクミストとして放出される．つまりインク
溶液に直接超音波をかけ、インクミストな発生させる方
式と異なり、あらかじめ付着膜にインク滴としてある程
度分解された形状をとっている．残りの作用力としては
インク滴を付着膜から振り払うエネルギー（振勤エネル
ギー〉のみ必要なだけである．
［ 実施例 ］
図中第２図に本発明によるインクミスト発生部の断面図
を示す．図中２１はインク溶液供給管であり一定量のイ
ンク液を２３の付着膜に２５に示される圧力により供給
している．また図中２２は付着膜を固定するリング状の
金枠である．また付・着膜は超音波によりＩＭＨｚで振
動している（２４の矢印で示す〉．２６は発生したイン
クミスト滴である．なお付着膜としては水性インクの場
合はミスト澗の放出のしやすさより、反発力が働く多孔
質ポリエチレン膜の様な疎水性膜が好ましく、油性イン
クの場合はポリアクリル酸塩の多孔質膜の様な親水性膜
が好ましい．またインクの親油・親水性によらず好まし
いものとしては鋼鉄などの金属メッシュの細かい膜等も
考えられる．また、図中第３図に本発明を利用した転写
装置の一構成要素図を示す．図中３１は第２図で説明し
たインクミスト発生部を示し発生したインクミスト３６
はエアーボンブ３２からの空気流により３３で示す集気
管を通リミスト帯電・印字部３４に運ばれ被転写媒体３
５に転写される．第３図に示した転写装置を用いて、イ
ンクミストの単位体積・単位時間あたりのインクミスト
発生量を求めた．また発生したインクミストを回収して
粒径分布を測定した．尚本発明の実施例及び比較例とし
ては次に述べるものまたは方法を用いた．実施例１
膜状物質 ポリアクリル酸ナトリウム膜（１ｍｍ
）
図中第３図に示す転写装置を用いて、水性インク及び油
性インクのインクミストを発生させた．実施例２
膜状物質
ポリエチレン膜（１．
５ｍｍ）
図中第３図に示す転写装置を用いて、水性インク及び浦
性インクのインクミストを発生させた．比較例１
市販されている加湿器と同じ機構を試作し、超音波の周
波数を２ＭＨｚとし水性インク及び油性インクのインク
ミスとを発生させた．
比較例２
ノズルから高速度でインク溶液を噴出させ壁に衝突させ
る事によりインクミストな発生させるタイプのもので水
性インク及び油性インクのインクミストを発生させた．
図中第４図（ａ）は水性インクを用いてインクミストを
発生させた場合の単位時間・体積当たりのインクミスト
発生量を測定した結果である．また図中第４図（ｂ）は
油性インクを用いた場合の単位時間・単位体積当たりの
インクミスト発生量を測定した結果である．
いずれの場合においても本発明によるインクミスト発生
方法を用いた場合は従来の方法と比べてインクミスト発
生量が非常に大きい事がわかる．ここで、従来例におい
て油性インクを用いた比較例ｌのインクミスト発生量が
極端に少なくなっているのは、ｅ音波振動子の振動エネ
ルギーの熱への変換が大きくなった為に、インク溶液が
ミスト化せずに蒸発してしまいインクミスト発生効率が
極端に低下したと考える事が出来る．
図中第５図は水性インクを用いてインクミストを発生さ
せ、そのインクミストの粒径分布を測定したものである
従来例と比較して本発明によるインクミスト発生方法を
用いて発生させたインクミストは平均粒子径も小さく、
粒径分布が非常にシャープである事がわかる．
また、本実施例により、イエロー マゼンタ、シアンの
インク溶液をインクミストとして発生させ、コロナチャ
ージャーにより帯電させ、帯電インクミストを被転写媒
体上に静電的に付着させ、重ね合わせる事により高速・
高濃度・高解像度のフルカラー画像を得る事が出来た．
［発明の効果］
以上述べてきたように、本発明によればｗＬ油性インク
溶液及び親水性インク溶液をミスト状とし画像記録様イ
ンクとして使用する場合に、大量かつ粒子径が小さく粒
径分布のシャープなインクミストを得る事が出来また発
生量も大きく出来るので、結果的に高速印刷が可能で、
高印字品質・高画質な印刷が可能なプリンタ・複写機・
ファクシミリ等の印写技術への応用が可能となる．また
言うまでもないが本発明のインクミスト発生方法の機構
は複雑な機構を必要とせず将来的には安価な印写装置の
製造が可能である．DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ink generating portion of a non-impact printing device. More specifically, it relates to the mist generation mechanism of a printing device that produces characters and images by selectively depositing mist-like ink onto a transfer medium during development. [Prior Art] In recent years, with the development of the information industry, the need for information/image output devices such as copying machines, printers, and facsimiles that use high-speed, high-quality, noiseless, non-impact printing methods has rapidly increased. An image recording method using ink mist (ink mist) is known as one type of image output device that satisfies these needs. Specifically, a method of forming an electrostatic latent image on a transfer medium between a needle electrode and a back electrode to form a charged ink mist. The second method is to control the passage of ions with an aperture board and selectively deposit ink mist. The third method is to irradiate a photoreceptor with an optical signal to form an electrostatic latent image, bring the transfer medium into contact, and electrostatically adhere a charged ink mist. A fourth method is to apply ultrasonic energy from the tip of an ultrasonic vibrating needle in response to an image signal to generate locally charged ink mist, apply an accelerating electric field, and make it adhere to the transfer medium. The ink mist generation method used in these printing principles was to generate ink mist by vibrating the ink solution using ultrasonic waves or by ejecting it from a nozzle at high speed and colliding with a wall. [Problems and Objectives to be Solved by the Invention] However, conventional ink mist generation methods are unable to generate sufficient ink mist necessary to increase speed. Also, because the particle size distribution of the ink mist is wide, high print quality and high image quality cannot be obtained. There were problems such as. In particular, in the method using ultrasonic vibration, the efficiency of converting the vibration energy for mist generation into thermal energy increases over time, resulting in problems such as inability to stably supply ink mist and high initial cost. there were. Therefore, the present invention was made to solve such problems, and its purpose is to generate ink mist with a large amount of ink solution and a uniform particle size, and to enable high-speed printing and
The aim is to provide an ink mist generation method that enables high-density, high-quality printing. [! ! Means for Solving the Problem] The ink mist generation method of the present invention is a printing apparatus that atomizes image recording ink and selectively adheres the generated ink mist onto a transfer medium for recording. The ink mist is generated by having a liquid holding film with a mesh structure in the mist generating part, adsorbing or adhering an ink solution to the liquid holding film, and vibrating the liquid holding film. [Operation] The ink mist generation operation according to the above configuration of the present invention will be explained. FIG. 1 is an enlarged view of a portion of the liquid retaining membrane having a mesh structure used in the ink mist generating mechanism of the present invention. It is knitted with fibrous material 11 in the form of a mesh (hereinafter referred to as an adhesion film), and when an ink solution is supplied, ink 1113 is accumulated in the pores shown in the figure due to the action of capillarity. By applying vibration to this, the ink droplets stored in the holes are released as ink mist. In other words, unlike the method of applying ultrasonic waves directly to the ink solution to generate an ink mist, the ink droplets are already decomposed to some extent on the adhered film. The only remaining acting force required is the energy to shake off the ink droplets from the adhered film (shaking energy). [Example] Figure 2 shows a cross-sectional view of the ink mist generating part according to the present invention. The inside 21 is an ink solution supply pipe which supplies a certain amount of ink liquid to the attached film 23 under the pressure shown at 25. In addition, 22 in the figure is a ring-shaped metal frame that fixes the attached film. The deposited film is vibrated at IMHz by ultrasonic waves (indicated by arrow 24).26 is the generated ink mist droplet.In the case of water-based ink, the deposited film is oscillated at IMHz by the arrow 24. A hydrophobic film such as a porous polyethylene film that exerts a repulsive force is preferable, and in the case of oil-based ink, a hydrophilic film such as a porous polyacrylate film is preferable. Preferably, a fine mesh film made of metal such as steel is also considered.Furthermore, FIG. 3 shows a diagram of the components of a transfer device using the present invention. Reference numeral 31 in the figure is explained in FIG. The generated ink mist 36 shows the ink mist generating area.
is carried by the air flow from the air bomb 32 through the air collecting pipe 33 to the rimist charging/printing section 34 and is transferred to the transfer medium 3.
5 is transcribed. Using the transfer device shown in Figure 3, the amount of ink mist generated per unit volume of ink mist and unit time was determined. In addition, the generated ink mist was collected and the particle size distribution was measured. The following methods and methods were used as examples of the present invention and comparative examples. Example 1 Membrane material Sodium polyacrylate membrane (1 mm
) Ink mist of water-based ink and oil-based ink was generated using the transfer device shown in Figure 3. Example 2 Membrane-like material Polyethylene film (1.5 mm) Ink mist of water-based ink and ura-based ink was generated using the transfer device shown in FIG. 3. Comparative Example 1 We prototyped the same mechanism as a commercially available humidifier, set the ultrasonic frequency to 2 MHz, and caused ink errors between water-based ink and oil-based ink. Comparative Example 2 An ink mist was generated by ejecting ink solution from a nozzle at high speed and colliding with a wall to generate ink mist of water-based ink and oil-based ink. Figure 4(a) shows the results of measuring the amount of ink mist generated per unit time and volume when ink mist was generated using water-based ink. Furthermore, Figure 4(b) shows the results of measuring the amount of ink mist generated per unit time and unit volume when oil-based ink was used. In either case, it can be seen that when the ink mist generation method according to the present invention is used, the amount of ink mist generated is much larger than that of the conventional method. Here, the reason why the amount of ink mist generated in Comparative Example 1 using oil-based ink in the conventional example is extremely small is because the conversion of the vibration energy of the e-sonic vibrator into heat is large, so the ink solution It can be considered that the ink mist generation efficiency was extremely reduced because the ink mist evaporated without turning into mist. Figure 5 shows the results of generating ink mist using water-based ink and measuring the particle size distribution of the ink mist.Comparing with the conventional example, the ink mist generated using the ink mist generation method according to the present invention is shown in Figure 5. Mist has a small average particle size,
It can be seen that the particle size distribution is very sharp. In addition, according to this embodiment, yellow magenta and cyan ink solutions are generated as ink mist, which is charged by a corona charger, and the charged ink mist is electrostatically adhered to the transfer medium and superimposed, so that high-speed printing is possible.
We were able to obtain full-color images with high density and high resolution. [Effects of the Invention] As described above, according to the present invention, when a wL oil-based ink solution and a hydrophilic ink solution are made into a mist and used as an image-recording ink, a large amount, a small particle size, and a particle size distribution can be obtained. A sharp ink mist can be obtained and the amount generated can be increased, resulting in high-speed printing.
Printers, copiers, and copiers that can print with high print quality and high image quality.
It becomes possible to apply it to printing technology such as facsimile. Needless to say, the mechanism of the ink mist generation method of the present invention does not require a complicated mechanism, and it will be possible to manufacture inexpensive printing devices in the future.
第１図は本発明のインクミスト発生機構に用いる付着膜
の一部分の拡大図．
第２図は本発明によるインクミスト発生部の断面図。
第３図は本発明を利用した転写装置の構成要素図
第４図（ａ）は水性インクを用いてインクミストを発生
させた場合の単位時間・体積当たりのインクミスト発生
量を測定した結果をまとめた図。
第４図（ｂ）は油性インクを用いた場合の単位時間・単
位体積当たりのインクミスト発生量を測定した結果をま
とめた図。
第５図は水性インクを用いてインクミストを発生させ、
そのインクミストの粒径塗布を測定した図。
第１図
第２図
例 例 例 例
１２１２
（０）
例 例
２１
（ｂ）
第４図
第５図Figure 1 is an enlarged view of a portion of the adhered film used in the ink mist generation mechanism of the present invention. FIG. 2 is a sectional view of an ink mist generating section according to the present invention. Figure 3 shows the components of a transfer device using the present invention. Figure 4 (a) shows the results of measuring the amount of ink mist generated per unit time and volume when ink mist is generated using water-based ink. A summarized diagram. FIG. 4(b) is a diagram summarizing the results of measuring the amount of ink mist generated per unit time and unit volume when oil-based ink is used. Figure 5 shows ink mist generated using water-based ink.
The figure which measured the particle size application of the ink mist. Figure 1 Figure 2 Example Example Example Example 1212 (0) Example Example 21 (b) Figure 4 Figure 5
Claims (1)
被転写媒体上に選択的に付着させて記録を行う印写装置
において、ミスト発生部に編み目構造の液体保持膜を持
ち、これにインク溶液を吸着叉は付着させ、該液体保持
膜を振動させることによりインクミストを発生すること
を特徴とするインクミスト発生方法。In a printing device that performs recording by atomizing ink for image recording and selectively adhering the generated ink mist onto a transfer medium, the mist generating part has a liquid retention film with a mesh structure, and the ink solution is 1. An ink mist generation method, comprising: adsorbing or adhering the liquid holding film, and generating ink mist by vibrating the liquid holding film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30144689A JPH03161352A (en) | 1989-11-20 | 1989-11-20 | Generation of ink mist |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30144689A JPH03161352A (en) | 1989-11-20 | 1989-11-20 | Generation of ink mist |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03161352A true JPH03161352A (en) | 1991-07-11 |
Family
ID=17896992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30144689A Pending JPH03161352A (en) | 1989-11-20 | 1989-11-20 | Generation of ink mist |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03161352A (en) |
-
1989
- 1989-11-20 JP JP30144689A patent/JPH03161352A/en active Pending
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