JPH0667641B2 - Electrostatic recording method - Google Patents
Electrostatic recording methodInfo
- Publication number
- JPH0667641B2 JPH0667641B2 JP60025853A JP2585385A JPH0667641B2 JP H0667641 B2 JPH0667641 B2 JP H0667641B2 JP 60025853 A JP60025853 A JP 60025853A JP 2585385 A JP2585385 A JP 2585385A JP H0667641 B2 JPH0667641 B2 JP H0667641B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- recording
- ions
- dielectric
- charge
- 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 - Fee Related
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
- B41J2/385—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
- B41J2/41—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing
- B41J2/415—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing by passing charged particles through a hole or a slit
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
- G03G15/32—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head
- G03G15/321—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head by charge transfer onto the recording material in accordance with the image
- G03G15/323—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head by charge transfer onto the recording material in accordance with the image by modulating charged particles through holes or a slit
Description
【発明の詳細な説明】 技術分野 本発明は静電記録方法に関する。TECHNICAL FIELD The present invention relates to an electrostatic recording method.
背景技術 従来の静電記録方法としては、針電極を利用して電荷保
持部材と電極間で直接放電を行なう直接放電記録方法
と、電荷保持部材から離れた位置で放電を行ない、これ
によって発生したイオンを利用する間接記録方法とがあ
るが、直接静電記録方法では針電極と電荷保持部材面と
の接触によって電荷保持部材面が損傷を受け易いこと、
あるいは針電極と電荷保持部材面との間隔を高精度に保
つ必要があることなどの欠点を有している。BACKGROUND ART As a conventional electrostatic recording method, a direct discharge recording method in which a needle electrode is used to directly perform a discharge between a charge holding member and an electrode, and a discharge is performed at a position distant from the charge holding member, are generated by this. Although there is an indirect recording method using ions, in the direct electrostatic recording method, the charge holding member surface is easily damaged by the contact between the needle electrode and the charge holding member surface,
Alternatively, it has a drawback that the distance between the needle electrode and the surface of the charge holding member needs to be maintained with high accuracy.
一方、間接放電記録方法は、前記直接放電記録方法の場
合よりも針電極と電荷保持部材面との間隔を大幅に広げ
ることができるので、その精度もゆるやかで、この方式
によると電荷保持部材面から離れた位置で安定な放電を
行ない、これによって発生したイオンを電荷保持部材面
に付着させることができるので使用し易く、したがって
この方式の装置に使用し得る記録電極も種々提案されて
いる。On the other hand, in the indirect discharge recording method, the distance between the needle electrode and the charge holding member surface can be greatly widened as compared with the case of the direct discharge recording method, so that the accuracy is gentle. Since stable discharge can be performed at a position distant from, and the ions generated thereby can be attached to the surface of the charge holding member, it is easy to use, and therefore various recording electrodes that can be used in the apparatus of this system have been proposed.
そして、従来の記録用電極にみられる電極の構造の困難
さ、穴づまりの発生、あるいはドツト径の広がりの制御
の困難性などの問題点を改良した潜像形成用電極として
特開昭54−3533号公報記載の電極が提案された。上記公
報に記載の潜像形成用電極は、放電によりイオンを発生
するための２個の導体の間に絶縁体を挾んで接着し、さ
らに上記導体の一方とイオン制御用の導体との間に絶縁
体を挾んで接着している多層構造をなしており、そして
この多層構造の電極にはイオンの通る穴が貫通してい
る。Then, as a latent image forming electrode which has improved the problems of the structure of the electrode, the occurrence of hole clogging, and the difficulty of controlling the spread of the dot diameter, which are found in the conventional recording electrode, JP-A-54-3533 The electrode described in the publication has been proposed. In the latent image forming electrode described in the above publication, an insulator is sandwiched and adhered between two conductors for generating ions by electric discharge, and further between one of the conductors and the ion control conductor. It has a multi-layered structure in which an insulator is sandwiched and adhered, and the electrode of this multi-layered structure has a hole through which ions pass.
この方法によれば、多層構造電極の貫通穴の内壁に露出
した２個の導体間にパルス電圧を印加し、その間に火花
放電を起させてイオンを発生せしめ、このイオン流の電
荷保持部材面へ流れる量を、制御電極へパルス電圧を印
加することにより制御し得るごとくなされているので、
記録速度も従来に比べて著しく改良され、高速記録がで
きると報告されている。According to this method, a pulse voltage is applied between the two conductors exposed on the inner wall of the through hole of the multilayer structure electrode, and spark discharge is generated between the two conductors to generate ions. Is controlled by applying a pulse voltage to the control electrode.
It is reported that the recording speed is remarkably improved as compared with the conventional one and that high speed recording can be performed.
しかしながら、上記の記録方法では、電極が露出してい
るために電極に流れる電流が大きく、また電極の近傍に
高エネルギーの電子および正負イオンが発生するので、
電極が腐蝕され易く、電極の耐久性が著しく阻害されて
イオン発生効率が低下するという欠点を有している。However, in the above recording method, since the electrode is exposed, the current flowing through the electrode is large, and high-energy electrons and positive and negative ions are generated near the electrode.
The electrodes have a drawback that they are easily corroded, the durability of the electrodes is significantly impaired, and the ion generation efficiency is reduced.
さらに、米国特許4155093号および同4160257号明細書に
は、他の放電記録方法が提案されている。Further, in US Pat. Nos. 4,155,903 and 4,160,257, another discharge recording method is proposed.
この方法は、第１の方向に延びる複数の第１電極と、第
１の方向と異なる第２の方向に延びて該第１電極ととも
にマトリックスを構成する第２電極と、該第２電極に対
し、前記第１電極とは反対側に設けられ前記マトリック
スに対応した開口を有する第３電極と、第１電極と第２
電極との間の第１誘電体と、前記第２電極と第３電極と
の間の第２誘電体とを有し、該第２誘電体はマトリック
スに対応した開口部を有し、前記第１電極と第２電極間
に交互電圧を印加し、前記第２電極と第１誘電体表面と
の放電によってイオンを発生させ、該イオンを前記第２
電極と第３電極との電位差によって前記第３電極の開口
部から引出し、該イオンによって記録材の表面に電荷ド
ットによる電荷パターンを形成する静電記録方法であ
る。この方法における放電は誘電体を介して行なわせる
ので、大電流が流れず、電極の損傷が比較的少ないとい
う利点を有している。In this method, a plurality of first electrodes extending in a first direction, a second electrode extending in a second direction different from the first direction and forming a matrix with the first electrode, and a second electrode are provided. A third electrode provided on the side opposite to the first electrode and having an opening corresponding to the matrix, the first electrode and the second electrode
A first dielectric between the electrodes and a second dielectric between the second and third electrodes, the second dielectric having openings corresponding to the matrix, Alternating voltage is applied between the first electrode and the second electrode, ions are generated by the discharge between the second electrode and the first dielectric surface, and the ions are generated by the second electrode.
It is an electrostatic recording method in which a charge pattern of charge dots is formed on the surface of a recording material by extracting from the opening of the third electrode by the potential difference between the electrode and the third electrode, and by the ions. Since the discharge in this method is performed through the dielectric, it has advantages that a large current does not flow and the damage to the electrodes is relatively small.
ところで、直接放電記録法は前記の欠点を有するもの
の、放電電極と記録体間の放電によってイオンを形成る
ため記録体の抵抗および層構成に困難があるが、イオン
が拡散することはすくなく、近年では電極の密度を増加
することによって、400ドット／in.〜500ドツト／in.の
高精細な電荷パターンを形成できる。Although the direct electric discharge recording method has the above-mentioned drawbacks, it has difficulty in the resistance and layer structure of the recording body because ions are formed by the discharge between the discharge electrode and the recording body. Then, by increasing the density of the electrodes, a high-definition charge pattern of 400 dots / in. To 500 dots / in. Can be formed.
一方、間接法静電記録方法においては前記の利点はある
が、記録体面にイオンを堆積させるためイオンの走行時
間中における拡散および記録体面上の堆積イオンの電界
による拡散によって高精細な電荷パターンの形成が困難
であった。走行時間によるイオンの拡散は記録ヘッドと
記録体面との距離を小さくすることによって減少させる
ことができるが、この間隔を小さくするとともに第３電
極での印加電圧を下げなければならず、その結果記録体
面上の堆積イオンの影響が強くなるので、この問題を解
決することは困難であった。On the other hand, the indirect electrostatic recording method has the above-mentioned advantages, but in order to deposit the ions on the surface of the recording medium, diffusion of ions during the transit time of the ions and diffusion of the accumulated ions on the surface of the recording medium due to the electric field form a high-definition charge pattern. It was difficult to form. The diffusion of ions due to the traveling time can be reduced by reducing the distance between the recording head and the surface of the recording medium. However, this distance must be reduced and the voltage applied to the third electrode must be reduced, resulting in recording. It was difficult to solve this problem because the influence of the deposited ions on the body surface becomes strong.
発明の目的 したがって、本発明は間接記録方法の利点を維持しつつ
イオンの拡散の影響を最小にし、高精細な電荷パターン
の形成を可能にする静電記録方法を提供することを目的
とする。SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide an electrostatic recording method that minimizes the influence of ion diffusion while maintaining the advantages of the indirect recording method and enables formation of a highly precise charge pattern.
発明の概要 本発明によれば、第１の方向に延びる複数の第１電極
と、第１の方向と異なる第２の方向に延びて該第１電極
とともにマトリックスを構成する第２電極と、該第２電
極に対し、前記第１電極とは反対側に設けられ前記マト
リックスに対応した開口を有する第３電極と、第１電極
と第２電極との間の第１誘電体と、前記第２電極と第３
電極との間の第２誘電体とを有し、該第２誘電体はマト
リックスに対応した開口部を有し、前記第１電極と第２
電極間に交互電圧を印加し、前記第２電極と第１誘電体
表面との放電によってイオンを発生させ、該イオンを前
記第２電極と第３電極との電位差によって前記第３電極
の開口部から引出し、該イオンによって記録材の表面に
電荷ドットによる電荷パターンを形成する静電記録方法
において、記録材の記録面と前記第３電極との間隔をｌ
（mm）、該第３電極への印加電圧をVs（Ｖ）、該記録面
上の電荷パターンの最大表面電位をVd（Ｖ）とした時、 2.5×103≦|Vs−Vd|／ｌ |Vs|≦1.5×103、および、１≦0.25を満足し、かつ、記
録材の厚さをｄ（mm）、該記録材の比誘電率をε、電荷
パターンの電荷密度σ（ｃ／mm2）としたとき、前記記
録材は、 ｄ≦1.8×10-12×ε／σ を満足することを特徴とする静電記録方法が提供される
ので、間接記録方法の利点を維持しつつイオンの拡散の
影響を最小にし、高生成な電荷パターンの形成を可能に
する。SUMMARY OF THE INVENTION According to the present invention, a plurality of first electrodes extending in a first direction, a second electrode extending in a second direction different from the first direction and forming a matrix with the first electrode, A third electrode provided on the opposite side of the first electrode from the first electrode and having an opening corresponding to the matrix; a first dielectric between the first electrode and the second electrode; Electrode and third
A second dielectric between the first electrode and the second electrode, the second dielectric having an opening corresponding to the matrix.
Alternating voltage is applied between the electrodes, ions are generated by the discharge between the second electrode and the first dielectric surface, and the ions are generated in the opening of the third electrode by the potential difference between the second electrode and the third electrode. In the electrostatic recording method in which a charge pattern of charge dots is formed on the surface of the recording material by the ions, the distance between the recording surface of the recording material and the third electrode is l.
(Mm), when the applied voltage to the third electrode is Vs (V) and the maximum surface potential of the charge pattern on the recording surface is Vd (V), 2.5 × 10 3 ≦ | Vs−Vd | / l | Vs | ≦ 1.5 × 10 3 and 1 ≦ 0.25 are satisfied, the thickness of the recording material is d (mm), the relative dielectric constant of the recording material is ε, and the charge density of the charge pattern is σ (c / mm 2 ), the recording material is provided with an electrostatic recording method characterized by satisfying d ≦ 1.8 × 10 −12 × ε / σ, so that the advantages of the indirect recording method are maintained. It minimizes the effect of ion diffusion and enables the formation of highly generated charge patterns.
実施例 第１図は本発明の静電記録方法に用いる静電記録ヘッド
の断面図、第２図は同斜視図である。EXAMPLE FIG. 1 is a sectional view of an electrostatic recording head used in the electrostatic recording method of the present invention, and FIG. 2 is a perspective view of the same.
この静電記録ヘッド１は第１図の横方向（第１の方向）
に延びる誘導電極である第１電極11と第１の方向と異な
る第２の方向に延びる放電電極である第２電極12（フィ
ンガー電極）とを有し、第１図上方から見た場合にこれ
らの電極はマトリックスを構成する。第２電極12の第１
電極11と反対側には第３電極13があり、これはマトリッ
クスに対応した複数の開口を有する。第１電極11と第２
電極12とそれらの間に第１誘電体14を挟持する。すなわ
ち第１電極11と第２電極12とは第１誘電体14の夫々の面
に固着されている。第２電極12と第３電極13もそれらの
間に第２誘電体15を挟持する。第２誘電体15は第３電極
13の複数開口に対応した開口16を有する。この構成のイ
オン発生装置の複数の第１電極11と第２電極12との間に
選択的に交互電圧を印加することにより、マトリックス
の選択された部分に対応する第２電極12の近傍に正，負
イオンが発生する。This electrostatic recording head 1 is shown in the lateral direction of FIG. 1 (first direction).
A first electrode 11 which is an induction electrode extending in a direction and a second electrode 12 (finger electrode) which is a discharge electrode extending in a second direction different from the first direction, and these are seen when viewed from above in FIG. Of the electrodes constitutes a matrix. First of the second electrode 12
On the opposite side of the electrode 11 is a third electrode 13, which has a plurality of openings corresponding to the matrix. First electrode 11 and second
An electrode 12 and a first dielectric 14 are sandwiched between them. That is, the first electrode 11 and the second electrode 12 are fixed to the respective surfaces of the first dielectric body 14. The second electrode 12 and the third electrode 13 also sandwich the second dielectric 15 between them. The second dielectric 15 is the third electrode
It has openings 16 corresponding to a plurality of 13 openings. By selectively applying an alternating voltage between the plurality of first electrodes 11 and the second electrodes 12 of the ion generator of this configuration, a positive voltage is generated in the vicinity of the second electrodes 12 corresponding to the selected portion of the matrix. , Negative ions are generated.
静電記録ヘッド１の第３電極13側に対向して記録体２が
設置され、該記録体２は誘電体層24と誘電層25とを有す
る。上記に説明のごとく、第１電極11と第２電極12との
間に交互電圧電源21によって交互電圧を印加することに
より、第１誘電体14の表面と第２電極12の端面で沿面放
電が発生するが、このとき印加する交互電圧の波形はサ
イン波、パルス波、三角波などの電圧波形のいずれでも
よい。この放電によって第２電極12近傍には正・負イオ
ンが生成される。この発生イオンを記録体２の誘電体層
24上に付着させるために、第２電極12にはバイアス電圧
が印加される。このバイアス電圧は画像記録信号に応じ
てスイッチＳによって制御される。第２電極12にはバイ
アス電源22により一定のバイアス電圧が印加されており
記録信号がない場合はスイッチＳはS1側に接続され、記
録信号がある場合はS2接続され、バイアス電源23による
バイアス電圧が印加される。The recording body 2 is installed so as to face the third electrode 13 side of the electrostatic recording head 1, and the recording body 2 has a dielectric layer 24 and a dielectric layer 25. As described above, by applying an alternating voltage between the first electrode 11 and the second electrode 12 by the alternating voltage power supply 21, a creeping discharge is generated on the surface of the first dielectric 14 and the end face of the second electrode 12. Although generated, the waveform of the alternating voltage applied at this time may be any voltage waveform such as a sine wave, a pulse wave, or a triangular wave. By this discharge, positive and negative ions are generated near the second electrode 12. The generated ions are applied to the dielectric layer of the recording body 2.
A bias voltage is applied to the second electrode 12 for deposition on 24. This bias voltage is controlled by the switch S according to the image recording signal. When a constant bias voltage is applied to the second electrode 12 by the bias power source 22 and there is no recording signal, the switch S is connected to the S1 side, and when there is a recording signal, the switch S is connected to the S2 side. Is applied.
第３電極13にもバイアス電源20によってバイアス電圧が
印加される。バイアス電源20によるバイアス電圧の絶対
値はバイアス電源22によるバイアス電圧の絶対値よりも
大きくバイアス電源22とバイアス電源23との合成バイア
ス電圧の絶対値よりも小さく選択される。これにより第
２電極12近傍で発生したイオンを記録体２に向けて抽出
する作動が制御される第２電極12へのバイアス電圧と第
３電極13へのバイアス電圧の極性は同極性である。A bias voltage is also applied to the third electrode 13 by the bias power supply 20. The absolute value of the bias voltage by the bias power source 20 is selected to be larger than the absolute value of the bias voltage from the bias power source 22 and smaller than the absolute value of the combined bias voltage of the bias power source 22 and the bias power source 23. As a result, the polarity of the bias voltage applied to the second electrode 12 and the bias voltage applied to the third electrode 13 are controlled so that the operation of extracting the ions generated near the second electrode 12 toward the recording medium 2 is controlled.
第１誘電体14の材質としてはセラミック、マイカ、ガラ
スなどの無機材料あるいはポリイミド、テフロン、ポリ
エステル、ポリアミドなどの有機高分子材料が用いら
れ、第１電極11、第２電極12および第３電極13の材質と
しては、ニッケル、ステンレス、タングステン、チタ
ン、タンタルなどが用いられる。第２誘電体15の材質と
しては第１誘電体14と同一でもよいが、開口16を形成し
やすい感光性樹脂を用いることが好ましい。第２電極12
の電圧は第１誘電体14の表面18と第２電極12の端面で絶
縁破壊が生じるような電圧以上とする。この値は第１誘
電体14のあつさによって変わる。As the material of the first dielectric 14, an inorganic material such as ceramic, mica, glass or an organic polymer material such as polyimide, Teflon, polyester, polyamide is used, and the first electrode 11, the second electrode 12 and the third electrode 13 are used. As the material of nickel, stainless steel, tungsten, titanium, tantalum, or the like is used. The material of the second dielectric 15 may be the same as that of the first dielectric 14, but it is preferable to use a photosensitive resin that facilitates formation of the opening 16. Second electrode 12
Is higher than the voltage at which dielectric breakdown occurs on the surface 18 of the first dielectric 14 and the end face of the second electrode 12. This value depends on the hardness of the first dielectric 14.
このようにして第３電極13の開口17から正又は負のイオ
ンを選択的に抽出して、記録体２の誘電体層24上にイオ
ンが付着する。この際イオンは電気力線に沿って進む
（負イオンは電気力線の逆向きに進む）ため、誘電体層
24上にはイオンが付着するにつれて、誘電体層24上で電
気力線が変化すると、イオンの拡散が生じ、形成される
べきドットパターンをゆがめることになる。In this way, positive or negative ions are selectively extracted from the opening 17 of the third electrode 13, and the ions are attached to the dielectric layer 24 of the recording body 2. At this time, the ions travel along the lines of electric force (negative ions travel in the opposite direction of the lines of electric force), so the dielectric layer
When the lines of electric force change on the dielectric layer 24 as the ions are deposited on the dielectric layer 24, the diffusion of the ions occurs and the dot pattern to be formed is distorted.
また、第３電極13の開口17から抽出されるイオンはすべ
て同一極性であるから、イオン間でのクーロン反発力に
より、イオンが拡がる傾向にあり、これも高精細化に対
して、悪影響となる。ドット径の拡大の原因としてはい
くつかの要素が考えられるが、発明者の種々の実験・分
析の結果、前記記録面と前記第３電極13との間隔をｌ
（mm）、該第３電極13への印加電圧Vs（Ｖ）、該記録体
２面上の電荷パターンの最大表面電位をVd（Ｖ）とした
時、|Vs−Vd|／ｌを2.5×103以上とすることによって電
荷像の径の拡大率が急速に抑制できることを見出した。Further, since all the ions extracted from the opening 17 of the third electrode 13 have the same polarity, there is a tendency for the ions to spread due to the Coulomb repulsion between the ions, which also has an adverse effect on high definition. . Several factors can be considered as the cause of the increase in the dot diameter, but as a result of various experiments and analyzes by the inventor, the distance between the recording surface and the third electrode 13 was set to l.
(Mm), the applied voltage Vs (V) to the third electrode 13, and the maximum surface potential of the charge pattern on the surface of the recording body 2 is Vd (V), | Vs−Vd | / l is 2.5 × It has been found that by setting the ratio to 10 3 or more, the enlargement ratio of the diameter of the charge image can be suppressed rapidly.
第３図はこの実験の結果を示すものである。交互電圧電
源21としては1MHz、2KVppのサイン波交互電圧を用い
た。第１誘電体14としては25μｍ厚のマイカを用いた。
第２電極12への印加バイアスとしては第３電極13への印
加の印加バイアスVsに対し、その絶対値が|Vs|＋100と
なるようにし、第３電極13への印加バイアスVsを変化さ
せ、その極性に一定とし負イオンを抽出させた。第３電
極13と記録体２の誘電体層24との空隙ｌは0.2mmとし
た。記録体２としては、アルミニウム基体の表面をアル
マイト処理したのちエポキシ樹脂を分散させたもの（比
誘電率＝8.5）を用い、その厚さｄを変化させることに
よって、記録体２に形成される電荷像による最大表面電
位Vdを変化させた。また第３電極13の開口17の直径とし
ては150μｍ、100μｍおよび60μｍの３種類を用いた。FIG. 3 shows the result of this experiment. A sine wave alternating voltage of 1 MHz and 2 KVpp was used as the alternating voltage power source 21. As the first dielectric 14, mica having a thickness of 25 μm was used.
As for the bias applied to the second electrode 12, the absolute value of the applied bias Vs applied to the third electrode 13 is | Vs | +100, and the applied bias Vs to the third electrode 13 is changed. The polarity was kept constant and negative ions were extracted. The gap l between the third electrode 13 and the dielectric layer 24 of the recording body 2 was 0.2 mm. As the recording body 2, an aluminum substrate whose surface is anodized and then dispersed with an epoxy resin (relative permittivity = 8.5) is used, and the charge formed on the recording body 2 is changed by changing the thickness d. The maximum surface potential Vd by the image was changed. As the diameter of the opening 17 of the third electrode 13, three types of 150 μm, 100 μm and 60 μm were used.
１ドットの電荷像の形成について６回のイオン発生放電
を用いた。１個の放電によって記録体２上に十分な電荷
量を形成するためには、第１電極11に印加する交互電圧
を非常に高くする必要があり、その結果第１誘電体14お
よび第２誘電体12の劣化が増加し電極の寿命が短くな
り、実用的でない。したがって、本方式による電荷像形
成においては、数回程度の放電によって１ドットの電荷
像を形成することが望ましい。空気中での負イオンのモ
ビリティーは約2cm2／Ｖ・Ｓであるので、加速電界2KV
／mmのもとでは１μsecの時間に約400μの距離を移動す
ることになる。このように、６回の放電で全電荷が１度
に開口17から抽出されるのではなく、１回の放電によっ
て発生したイオンはつぎの放電によってイオンが発生す
る前に開口17から抽出されることになる。Six ion generating discharges were used for the formation of a one dot charge image. In order to form a sufficient amount of charge on the recording body 2 by one discharge, the alternating voltage applied to the first electrode 11 needs to be extremely high, and as a result, the first dielectric 14 and the second dielectric The deterioration of the body 12 is increased and the life of the electrode is shortened, which is not practical. Therefore, in the charge image formation by this method, it is desirable to form a one-dot charge image by discharging several times. The mobility of negative ions in air is about 2 cm 2 / V · S, so the acceleration electric field is 2 KV.
Under the condition of / mm, it will move about 400μ in 1μsec. In this way, the total charge is not extracted from the opening 17 at once by six discharges, but the ions generated by one discharge are extracted from the opening 17 before the ions are generated by the next discharge. become.
第３図の縦軸は開口17の直径ｒと電荷像の直径ｒ′の比
率ｒ′／ｒを示すｒ′−ｒ＝Δｒが電界像の拡がりであ
る。第３図から理解されるように、スクリーン開口の径
ｒの減少とともに電荷像の径は逆に急激に増加する。|V
s−Vd|／ｌが2.5KV／mm以上の範囲ではこの拡大比率
ｒ′／ｒが急激に小さくなる。The vertical axis in FIG. 3 represents the spread of the electric field image, where r′−r = Δr, which represents the ratio r ′ / r of the diameter r of the opening 17 and the diameter r ′ of the charge image. As can be seen from FIG. 3, the diameter of the charge image, on the contrary, sharply increases as the diameter r of the screen opening decreases. | V
In the range where s-Vd | / l is 2.5 KV / mm or more, this enlargement ratio r '/ r decreases rapidly.
|Vs−Vd|／ｌが2.5KV／mm以上の範囲においては、第３
図からｒ′／ｒは1.5以下である。この値について検討
する。第４図においてr0は径の拡がりが０の場合を示
し、本発明における開口17の直径に相当する。例えば、
400ドット／in.の画像を得る場合r0＝63.5μｍである。
一方、rdは実際に形成される像の径を示し、rdが大きく
なると、黒、白、黒のパターンを形成したさい、中央の
白部が埋められてしまうことになる。上記の1.5という
数値はこのような状態を招来することなく、実用上許容
可能なものである。When | Vs−Vd | / l is 2.5KV / mm or more, the third
From the figure, r '/ r is less than 1.5. Consider this value. In FIG. 4, r 0 shows the case where the diameter expansion is 0, and corresponds to the diameter of the opening 17 in the present invention. For example,
When obtaining an image of 400 dots / in., R 0 = 63.5 μm.
On the other hand, rd represents the diameter of the image that is actually formed, and when rd becomes large, the white portion at the center will be filled up when forming a black, white, or black pattern. The above value of 1.5 is practically acceptable without causing such a state.
したがって、|Vs−Vd|／ｌ≧2.5×103の範囲は径の拡大
比率を急激に抑制でき、しかも、許容可能なドット径の
拡がりの範囲となるという両方の条件を同時に満足する
範囲である。Therefore, in the range of | Vs−Vd | /l≧2.5×10 3 , the diameter expansion ratio can be sharply suppressed, and at the same time, both the conditions that the range of the allowable dot diameter expansion is satisfied are satisfied. is there.
つぎに、第３電極13と第２電極12との距離ｌについて考
察する。記録体２上の電荷によって、導線層25と誘電体
層24との間に生ずる電位Vdは、ｌを大きくすることによ
ってVsを大きくできるので、この場合（|Vs|／ｌ）×
（１−Vd／Vs|≒|V|／ｌと近似される。したがって、同
一の電界強度においても、Vdの影響を減少させることが
可能と考えられる。例えば、ｌ＝0.2mm、Vs＝−700V、V
d＝−200Vの条件では|Vs−Vd|／ｌ＝2.5KV／mm、|Vs|／
ｌ＝3.5KV／mmとなり、Vdによる電界強度の減少が大き
く影響するが、ｌ＝0.06mm、Vs＝−1700V、Vd＝−200V
においては、|Vs−Vd|／ｌ＝2.5KV／mm、|Vs|／ｌ＝2.8
KV／mmであり、Vdによる電界強度の減少は小さい。この
点から言えば、ｌを大きくすることが望ましいように見
えるが、高精細な画像を得るためには、ｌを任意的に大
きくすることはできない。Next, the distance 1 between the third electrode 13 and the second electrode 12 will be considered. The electric potential Vd generated between the conductor layer 25 and the dielectric layer 24 by the charge on the recording medium 2 can be increased by increasing l, so that in this case (| Vs | / l) ×
(1−Vd / Vs | ≈ | V | / l. Therefore, it is considered possible to reduce the influence of Vd even with the same electric field strength. For example, l = 0.2 mm, Vs = − 700V, V
Under the condition of d = −200V, | Vs−Vd | /l=2.5KV/mm, | Vs | /
l = 3.5KV / mm, and the decrease of the electric field strength due to Vd has a great effect, but l = 0.06mm, Vs = -1700V, Vd = -200V
, | Vs−Vd | /l=2.5KV/mm, | Vs | /l=2.8
It is KV / mm, and the decrease in electric field strength due to Vd is small. From this point of view, it seems desirable to increase l, but in order to obtain a high-definition image, l cannot be arbitrarily increased.
第５図は電界強度を一定としたもとで（Ｅ＝2.5KV／m
m）、第３電極13と誘電体層24間の間隙ｌによる径の拡
がりΔｒを開口17の径ｒとの比率Δｒ／ｒとして表わし
たものである。記録体２としてはVdの影響をなくすた
め、静電記録紙を用い、導電性現像粉によって現像を行
い、現像像の径の変化を測定した。第５図において、
Ａ、Ｂ、Ｃは、それぞれ開口17の径ｒが150μｍ、100μ
ｍ、60μｍの場合をそれぞれ示す。この図から高精細な
画像を得るためには、電界強度は別としても、第３電極
13と第２電極12との間隙は0.25mm以下、好ましくは、0.
2mm以下である。Fig. 5 shows a constant electric field strength (E = 2.5KV / m
m), the diameter expansion Δr due to the gap 1 between the third electrode 13 and the dielectric layer 24 is expressed as a ratio Δr / r with the diameter r of the opening 17. In order to eliminate the influence of Vd as the recording body 2, electrostatic recording paper was used, development was performed with conductive developing powder, and the change in diameter of the developed image was measured. In FIG.
In A, B, and C, the diameter r of the opening 17 is 150 μm and 100 μ, respectively.
m and 60 μm, respectively. In order to obtain a high-definition image from this figure, the third electrode
The gap between the 13 and the second electrode 12 is 0.25 mm or less, preferably 0.1.
It is 2 mm or less.
一方、電界強度についても、無制限に大きくすることは
できない。第３電極13への印加電圧を大きくし、間隙ｌ
を小さくすると第３電極13と記録体２との間で放電が発
生し、第３電極13や誘電体層24が損傷する。このため|V
s|／Pl（P:気圧・Torr）を一定値以下にすることが好ま
しい。一般に静電記録装置に限らず、プリンターや複写
機においても、少なくとも600Torr程度の環境は十分信
頼性のあるものである。いまＰ＝600Torrとし、ｌ＝0.2
5mmとしたとき|Vs|は1.5KVよりも小さいことが好ましい
（|Vs|／ｌ＜6KV／mm）。また、ｌ＝0.1mmでは|Vs|は0.
8KVよりも小さいことが好ましい。以上から、|Vs|な1.5
KVよりも小さいことが望ましい。第５図に間隙ｌと電界
強度|Vs|／lKV／mmの関係を破線で示す。On the other hand, the electric field strength cannot be increased without limit. The voltage applied to the third electrode 13 is increased to increase the gap l
When is smaller, a discharge is generated between the third electrode 13 and the recording body 2, and the third electrode 13 and the dielectric layer 24 are damaged. For this | V
It is preferable to set s | / Pl (P: atmospheric pressure · Torr) to a certain value or less. Generally, not only in electrostatic recording devices, but also in printers and copiers, an environment of at least 600 Torr is sufficiently reliable. Now set P = 600 Torr and l = 0.2
When set to 5 mm, | Vs | is preferably smaller than 1.5 KV (| Vs | / l <6 KV / mm). In addition, | Vs | is 0 when l = 0.1 mm.
It is preferably smaller than 8 KV. From the above, | Vs |
It is desirable to be smaller than KV. FIG. 5 shows the relationship between the gap 1 and the electric field strength | Vs | / lKV / mm by a broken line.
以上述べたように、本方式の記録装置において高精細な
画像を形成するためには、間隙ｌを小さくすることが望
ましいが、この間隙ｌを小さくすることによって|Vs|を
小さくしなければならず、その結果Vdによる電界強度の
減少が大きくなる。例えば、ｌ＝0.15mmとしたとき、限
界電界強度は1.1KVであるが、実際に使用する場合にお
いては、間隙のばらつきを考慮する必要があり、ｌ＝0.
1〜0.2mm程度の範囲において第３電極13と記録体２との
間の放電を良好にすることが必要である。これを満たす
ためには|Vs|は800Vよりも小さくすることが好ましく、
記録体２上に形成される電荷像による誘電体層24と導電
層25間の最大電位Vdが−400Vの場合、|Vs−Vd|／ｌ＜2K
V／mm（ｌ＝0.2mmの部分において）になり、第３図から
理解されるように、イオンの拡がりが顕著になり、高精
細な画像を得ることができない。この傾向は間隙ｌを小
さくすることによって、強くなるが、発明者は、誘電体
層24の厚さをdmm、比誘電率ε、誘電体層24上に形成す
る電荷像の電荷密度をσ（ｃ／mm2）としたとき ｄ1.8×10-12×ε／σ を満たすように、開口17よりのイオン抽出量に対し記録
体２の材料を決めることによって、電荷像の最大表面電
位Vdを200V以下に抑えることができ、間隙ｌを小さくし
ても前述の不都合を避けることができることを見出し
た。As described above, it is desirable to reduce the gap l in order to form a high-definition image in the recording apparatus of this system, but | Vs | must be reduced by reducing the gap l. As a result, the decrease in electric field strength due to Vd becomes large. For example, when l = 0.15 mm, the limit electric field strength is 1.1 KV, but in actual use, it is necessary to consider the variation in the gap, and l = 0.
It is necessary to improve the discharge between the third electrode 13 and the recording body 2 in the range of about 1 to 0.2 mm. To satisfy this, it is preferable that | Vs | be smaller than 800V,
When the maximum potential Vd between the dielectric layer 24 and the conductive layer 25 by the charge image formed on the recording body 2 is −400V, | Vs−Vd | / l <2K
It becomes V / mm (in the portion of l = 0.2 mm), and as understood from FIG. 3, the spread of ions becomes remarkable and a high-definition image cannot be obtained. This tendency is strengthened by decreasing the gap l, but the inventor has determined that the thickness of the dielectric layer 24 is dmm, the relative permittivity ε, and the charge density of the charge image formed on the dielectric layer 24 is σ ( c / mm 2 ), the maximum surface potential Vd of the charge image is determined by determining the material of the recording body 2 with respect to the amount of extracted ions from the opening 17 so as to satisfy d1.8 × 10 −12 × ε / σ. It has been found that the above can be suppressed to 200 V or less, and the above-mentioned inconvenience can be avoided even if the gap 1 is reduced.
以下この点について説明する。This point will be described below.
交互電圧電源21として1MHz、2KVppのサイン波を用い第
１誘電体14として、厚さ25mmのマイカを用い、６回の放
電によるイオン発生で１ドットを形成させた。このイオ
ンを、第２電極12へのバイアス電圧、−800V（バイアス
電極22とバイアス電源23の合計）および第３電極13への
バイアス電圧−700Vにより抽出した。開口17の開口は、
径を60μｍとした。A 1 MHz, 2 KVpp sine wave was used as the alternating voltage power supply 21, and a mica having a thickness of 25 mm was used as the first dielectric material 14, and one dot was formed by ion generation by six discharges. The ions were extracted with a bias voltage to the second electrode 12 of −800V (total of the bias electrode 22 and the bias power source 23) and a bias voltage of −700V to the third electrode 13. The opening of the opening 17 is
The diameter was 60 μm.
このときのイオン発生量は約５×10-4c／m2すなわちσ
＝５×10-10c／mm2であった。The amount of generated ions at this time is about 5 × 10 -4 c / m 2 or σ
= 5 × 10 -10 c / mm 2 .
一方、記録体２と第３電極13とのギャップｌ＝0.2mmに
よって誘電体層24上に電荷像を形成した。記録体２の誘
電体層24としてアルミニウム基体25の表面をアルマイト
処理後エポキシ樹脂を分散した比誘電率ε＝8.5のもの
を用い、厚さｄを10μｍ、30μｍ、50μｍとした。On the other hand, a charge image was formed on the dielectric layer 24 by the gap 1 = 0.2 mm between the recording body 2 and the third electrode 13. As the dielectric layer 24 of the recording body 2, a material having a relative permittivity ε = 8.5 in which the surface of an aluminum substrate 25 is anodized and epoxy resin is dispersed is used, and the thickness d is set to 10 μm, 30 μm, and 50 μm.
このとき、誘電体層24上の電荷像の最大電位Vaはそれぞ
れ約70V、200V、350Vであった。この電荷像を導電性現
像粉によって可視像にし、その径を測定した。それぞれ
の径は、約70μｍ、85μ、130μであった。したがっ
て、この場合ｄ＝30μｍが高精細な画像を得るための限
界と考えられる。At this time, the maximum potential Va of the charge image on the dielectric layer 24 was about 70V, 200V, and 350V, respectively. The charge image was made into a visible image with conductive developer powder, and the diameter was measured. The respective diameters were about 70 μm, 85 μ, and 130 μ. Therefore, in this case, d = 30 μm is considered to be the limit for obtaining a high-definition image.
また、ｌ＝0.1〜0.2mmの変動巾で、第３電極13への印加
バイアス電圧Vsを700Vとし（100μｍにおける第３電極1
3と記録体２間の放電開始電圧は約800Vであるとし、同
様の方法で、可視像径を測定したところ、それぞれ、約
70μｍ、85μｍ、130μｍであった。Further, the bias voltage Vs applied to the third electrode 13 is set to 700 V with a fluctuation range of l = 0.1 to 0.2 mm (the third electrode 1 at 100 μm
The discharge starting voltage between the recording medium 3 and the recording body 2 is about 800 V, and the visible image diameter was measured by the same method.
It was 70 μm, 85 μm and 130 μm.
以上からｄ1.8×10-12×ε／σを満足する厚さが好ま
しいことが理解される。From the above, it is understood that a thickness satisfying d1.8 × 10 −12 × ε / σ is preferable.
尚ここで述べた電荷像の最大電位Vdは記録体２上に電荷
像を全て形成した時に表われる電位である。The maximum electric potential Vd of the charge image described here is a potential that appears when the entire charge image is formed on the recording body 2.
第６図は上述の静電記録ヘッドを用いた静電記録装置の
一例である。FIG. 6 shows an example of an electrostatic recording device using the electrostatic recording head described above.
参照符号51は本発明イオン発生方法によるイオン発生装
置を示す。このイオン発生装置51によって記録体52上に
不図示の電気信号に応じて静電潜像が形成される。次に
この形成された静電潜像は現像装置53によって導電性ト
ナーで顕像化される。この顕像像は58のガイドに沿って
挿入される不図示の転写材に転写ローラ55と記録体52と
の圧接によって転写、分離され、排紙ガイド60に沿って
搬出される。Reference numeral 51 indicates an ion generator according to the ion generating method of the present invention. An electrostatic latent image is formed on the recording medium 52 by the ion generating device 51 according to an electric signal (not shown). Next, the formed electrostatic latent image is visualized with the conductive toner by the developing device 53. This visible image is transferred and separated by pressure contact between the transfer roller 55 and the recording body 52 on a transfer material (not shown) inserted along the guide 58, and is carried out along the paper discharge guide 60.
又転写の終了した記録体52は磁界の記録に備えクリーニ
ング装置56によって残留トナーを除去され、除電器57に
より前回の静電潜像が均一に除電される。In addition, the recording device 52, which has completed the transfer, removes the residual toner by the cleaning device 56 in preparation for the recording of the magnetic field, and the static eliminator 57 uniformly removes the previous electrostatic latent image.
発明の効果 以上説明のごとく本発明によれば、記録材に至るイオン
群の拡散および記録材上に堆積したイオンによる悪影響
を除くことができ、高精細な電荷パターンの形成が可能
となる。EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to eliminate the adverse effects of the diffusion of ions reaching the recording material and the ions deposited on the recording material, and it is possible to form a highly precise charge pattern.
第１図は本発明の静電記録方法に用いる記録ヘッドの断
面図、 第２図は第１図の記録ヘッドの分解斜視図、 第３図はドット径の拡がりを示すグラフ、 第４図はドット径の拡がりの影響を説明する図、 第５図は記録ヘッドと記録体間の距離によるドット径の
拡がりの影響を示すグラフ、 第６図は本発明の静電記録方法に用いる静電記録装置の
断面図である。 符号の説明 11:第１電極 12:第２電極 13:第３電極 14:第１誘電体 15:第２誘電体 16:開口16 17:開口17FIG. 1 is a sectional view of a recording head used in the electrostatic recording method of the present invention, FIG. 2 is an exploded perspective view of the recording head of FIG. 1, FIG. 3 is a graph showing the spread of the dot diameter, and FIG. FIG. 5 is a diagram for explaining the influence of the spread of the dot diameter, FIG. 5 is a graph showing the influence of the spread of the dot diameter depending on the distance between the recording head and the recording medium, and FIG. 6 is the electrostatic recording used in the electrostatic recording method of the present invention. It is sectional drawing of an apparatus. DESCRIPTION OF SYMBOLS 11: First electrode 12: Second electrode 13: Third electrode 14: First dielectric 15: Second dielectric 16: Opening 16 17: Opening 17
フロントページの続き (72)発明者 竹内 達夫 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 江上 秀己 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 保坂 昭仁 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (56)参考文献 特開 昭55−50265（ＪＰ，Ａ)Front page continued (72) Inventor Tatsuo Takeuchi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hideki Egami 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Akihito Hosaka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) Reference JP-A-55-50265 (JP, A)
Claims (1)
１の方向と異なる第２の方向に延びて該第１電極ととも
にマトリックスを構成する第２電極と、該第２電極に対
し、前記第１電極とは反対側に設けられ前記マトリック
スに対応した開口を有する第３電極と、第１電極と第２
電極との間の第１誘電体と、前記第２電極と第３電極と
の間の第２誘電体とを有し、該第２誘電体はマトリック
スに対応した開口部を有し、前記第１電極と第２電極間
に交互電圧を印加し、前記第２電極と第１誘電体表面と
の放電によってイオンを発生させ、該イオンを前記第２
電極と第３電極との電位差によって前記第３電極の開口
部から引出し、該イオンによって記録材の表面に電荷ド
ットによる電荷パターンを形成する静電記録方法におい
て、記録材の記録面と前記第３電極との間隔をｌ（m
m）、該第３電極への印加電圧をVs（Ｖ）、該記録面上
の電荷パターンの最大表面電位をVd（Ｖ）とした時、 2.5×103≦|Vs−Vd|／ｌ |Vs|≦1.5×103、および、ｌ≦0.25を満足し、かつ、記
録材の厚さをｄ（mm）、該記録材の比誘電率をε、電荷
パターンの電荷密度σ（ｃ／mm2）としたとき、前記記
録材は、 ｄ≦1.8×10-12×ε／σ を満足することを特徴とする静電記録方法。1. A plurality of first electrodes extending in a first direction, a second electrode extending in a second direction different from the first direction and forming a matrix with the first electrode, and a second electrode. On the other hand, a third electrode provided on the opposite side of the first electrode and having an opening corresponding to the matrix, the first electrode and the second electrode.
A first dielectric between the electrodes and a second dielectric between the second and third electrodes, the second dielectric having openings corresponding to the matrix, Alternating voltage is applied between the first electrode and the second electrode, ions are generated by the discharge between the second electrode and the first dielectric surface, and the ions are generated by the second electrode.
In the electrostatic recording method, in which a charge pattern of charge dots is formed on the surface of the recording material by the ions extracted from the opening of the third electrode due to the potential difference between the electrode and the third electrode, the recording surface of the recording material and the third surface The distance from the electrode is l (m
m), the applied voltage to the third electrode is Vs (V), and the maximum surface potential of the charge pattern on the recording surface is Vd (V), 2.5 × 10 3 ≦ | Vs−Vd | / l | Vs | ≦ 1.5 × 10 3 and l ≦ 0.25 are satisfied, the thickness of the recording material is d (mm), the relative permittivity of the recording material is ε, and the charge density of the charge pattern is σ (c / mm 2 ) In the electrostatic recording method, the recording material satisfies d ≦ 1.8 × 10 −12 × ε / σ.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60025853A JPH0667641B2 (en) | 1985-02-13 | 1985-02-13 | Electrostatic recording method |
| US06/827,431 US4697196A (en) | 1985-02-13 | 1986-02-10 | Electrostatic recording method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60025853A JPH0667641B2 (en) | 1985-02-13 | 1985-02-13 | Electrostatic recording method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61185457A JPS61185457A (en) | 1986-08-19 |
| JPH0667641B2 true JPH0667641B2 (en) | 1994-08-31 |
Family
ID=12177386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60025853A Expired - Fee Related JPH0667641B2 (en) | 1985-02-13 | 1985-02-13 | Electrostatic recording method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0667641B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008139735A (en) * | 2006-12-05 | 2008-06-19 | Kobayashi Create Co Ltd | Information display medium |
| EP2601054A1 (en) * | 2010-08-04 | 2013-06-12 | Triakon N.V. | Print head element, print head and ionographic printing apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5550265A (en) * | 1978-10-06 | 1980-04-11 | Fuji Photo Film Co Ltd | Electrostatic recording method |
-
1985
- 1985-02-13 JP JP60025853A patent/JPH0667641B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61185457A (en) | 1986-08-19 |
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