JPS6165270A - Image recording device - Google Patents

Image recording device

Info

Publication number
JPS6165270A
JPS6165270A JP18733884A JP18733884A JPS6165270A JP S6165270 A JPS6165270 A JP S6165270A JP 18733884 A JP18733884 A JP 18733884A JP 18733884 A JP18733884 A JP 18733884A JP S6165270 A JPS6165270 A JP S6165270A
Authority
JP
Japan
Prior art keywords
image
charge
recording paper
toner
ion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP18733884A
Other languages
Japanese (ja)
Inventor
Yoshihiko Fujimura
義彦 藤村
Kiyoshi Horie
潔 堀江
Koichi Saito
孝一 斉藤
Nanao Inoue
井上　七穂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP18733884A priority Critical patent/JPS6165270A/en
Publication of JPS6165270A publication Critical patent/JPS6165270A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G03G15/34—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 powder image is formed directly on the recording material, e.g. by using a liquid toner
    • G03G15/344—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 powder image is formed directly on the recording material, e.g. by using a liquid toner by selectively transferring the powder to the recording medium, e.g. by using a LED array
    • G03G15/348—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 powder image is formed directly on the recording material, e.g. by using a liquid toner by selectively transferring the powder to the recording medium, e.g. by using a LED array using a stylus or a multi-styli array

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)

Abstract

PURPOSE:To obtain the image recording device which is driven at a low signal voltage and has high reliability by including an ion current modulating means which give a charge in an image shape with an ion current and a transfer means which gives a charge to recording paper which contacts a developer carrier from its reverse surface. CONSTITUTION:An air flow B is generated to transport forcibly ions generated by a corona discharger 8, and an electric signal is applied to a control electrode 7a provided nearby the exit of the air flow to control the passing amount of ions. This charge supplying means 4 gives a charge in the image shape to a toner layer to evade completely the staining of the electrode due to the contact electrostatic charging by a multistylus electrode and the electrostatic charging by ion flow modulation having no air flow. The toner layer is sent to a transfer part and given the charge of the same polarity with toner 3 by a transfer corotron 5 from the reverse side of recording paper 6 while contacting the recording paper 6 to dislocate only image part toner onto the recording paper 6, obtaining a recording image. Consequently, the image corresponding to an electric signal is recorded with the simple constitution, the device is driven at a low signal voltage, and a high-reliability image is obtained.

Description

【発明の詳細な説明】 「産業上の利用分野」 本発明は、電気人力信号に応じた画像を記録紙上に得る
画像記録装置に関する。更に詳しくは、電気人力信号に
応じて、粉体現像剤を記録紙上に付着せしめて画像を形
成する画像記録装置に関する。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an image recording apparatus that produces an image on recording paper in response to an electric human input signal. More specifically, the present invention relates to an image recording apparatus that forms an image by depositing a powder developer onto recording paper in response to an electric manual signal.

「従来の技術、発明が解決しようとする問題点」電気人
力信号に応じて粉体画像を形成する装“置としては、電
気信号−光像変換し、通常の電子写（″５プロセスで可
視像を得る装置や、１Ｍｉ”α体上に電気信号に応じた
帯電パターンを形成し、これを現像−転写一定着して画
像形成する静電記録′！Ｊｉ置、及び、現像剤担体に近
接して、記録紙を挟んで、スタイラス電極等の電界印加
手段を設け、該電界印加手段の形成する電界によって記
録紙上に粉体を付着せしめて可視像をｉ尋るいわゆるコ
ントログラフイーが知られている。``Prior art and problems to be solved by the invention'' As a device for forming a powder image in response to an electric human power signal, there is a device that converts an electric signal to an optical image, A device for obtaining a visual image, an electrostatic recording device that forms a charging pattern according to an electric signal on a 1Mi"α body, and forms an image by developing and transferring it to form an image, and a developer carrier. An electric field applying means such as a stylus electrode is provided adjacent to the recording paper with the recording paper in between, and the electric field generated by the electric field application means causes powder to adhere to the recording paper to form a visible image. Are known.

電子写真を用いた装置、及び、静電記録衣１δは高密度
、高精細な画像を１５トられる記録装置であるナーのみ
を記録紙へ静電的に転移せしめて画像を形成する装置も
提案されている。A device using electrophotography, and an electrostatic recording device 1δ is a recording device capable of producing high-density, high-definition images.A device that forms images by electrostatically transferring only the toner onto recording paper was also proposed. has been done.

これは、担体上にトナー薄層を形成し、該トナー薄層に
近接して設けられた多針電極に信号を印加し、トナーに
選択的に電荷を与え、この電荷の付与されたトナーのみ
を、一様な電界で記録紙へ転写するものであり、前述し
たコントログラフイーに比べ、印加する電気信号が低電
圧で済み、且つ、信号印加部に紙が介在しない為に、電
界の広がりが少なく、解像力も良い。This method involves forming a thin toner layer on a carrier, applying a signal to a multi-needle electrode provided close to the thin toner layer, selectively imparting an electric charge to the toner, and only applying this electric charge to the toner. is transferred to the recording paper using a uniform electric field, and compared to the above-mentioned controllography, the applied electric signal only needs a lower voltage, and since there is no paper in the signal application section, the electric field spreads evenly. The resolution is also good.

しかしながら、かかる構成においては、多針電極が、ト
ナーに接触あるいは、近接して存在する必要があり、こ
のため、電極の汚れを避ける事が出来ず、信頼性の低い
ものであった。However, in such a configuration, the multi-needle electrode needs to be in contact with or in close proximity to the toner, and therefore, it is impossible to avoid staining of the electrode, resulting in low reliability.

又、信号電圧もコントログラフイーに比べ低いとはいっ
ても、百〜数百ボルトを要し、駆動素子の集積化は困難
である。Furthermore, although the signal voltage is lower than that of controllography, it requires hundreds to several hundreds of volts, making it difficult to integrate the driving elements.

本発明は、かかる問題点にかんがみなされたものであっ
て、その目的は、簡易な構成で、電気信号に応じた画像
を記録する装置を提供するものでが、潜像を担持するド
ラム又はベルトを要し、且つ、潜像形成−現像一転写−
クリーニング一定着等の多くのサブシステムを有する為
に、装置の大型化、高価格化を生じると共に、各サブシ
ステムの高い信頼性を必要とするという問題があった。The present invention has been made in view of such problems, and its purpose is to provide a device that has a simple configuration and records an image according to an electric signal. , and latent image formation - development and transfer -
Since the apparatus includes many subsystems such as a cleaning unit, the apparatus becomes larger and more expensive, and each subsystem requires high reliability.

一方、コントログラフイーに右いては、潜像を必要とせ
ず、現像剤担体上のトナーを直接記録紙へ転移せしめて
、画像を形成する為に、クリーニングも不要である等、
潜像記録の欠点があったところの装置の大きさ、価格、
信頼性を改善する事が出来る。On the other hand, contrastography does not require a latent image, and the toner on the developer carrier is directly transferred to the recording paper to form an image, so cleaning is not necessary.
The disadvantages of latent image recording were the size, price, and
Reliability can be improved.

しかしながら、記録紙を介して電界印加手段と現像剤担
体間に電界を印加する構成であるため、トナーの担体か
ら記録紙への転移に要する電界を肖る為には、高電圧を
必要とし、電気的、駆動が難しく、結局、高価格化して
しまい、又、電界の広がりによって、解像力の限界が悪
いという欠点を有している。However, since the configuration is such that an electric field is applied between the electric field applying means and the developer carrier via the recording paper, a high voltage is required to generate the electric field required to transfer the toner from the carrier to the recording paper. It is difficult to drive electrically, resulting in a high price, and it also has the drawback of poor resolution due to the spread of the electric field.

トナーを担体上に保持し、該トナーに画像状に選択的に
電荷を付与し、この電荷を付与されたトある。The toner is held on a carrier, and a charge is selectively applied to the toner in an imagewise manner.

又、本発明の目的は、低い信号電圧で駆動でき、信頼性
の高い画像記録装置を提供するものである。Another object of the present invention is to provide an image recording device that can be driven with a low signal voltage and has high reliability.

「問題点を解決するための手段、作用」本発明は、現像
剤担体上に保持され単一極性に帯電した現像剤薄層に、
該現像剤と逆極性のイオン流であって電気信号に応じて
変調したイオン流、により、画像状に電荷を与えるイオ
ン流変調手段と、該イオン流変調手段の下流に配置され
、現像剤担体に密着させられた記録紙にその裏面から電
荷を付与する転写手段と、を含むことを特徴とする。"Means and effects for solving the problems" The present invention provides a thin layer of developer held on a developer carrier and charged to a single polarity.
an ion flow modulation means for applying an image-wise charge by an ion flow having a polarity opposite to that of the developer and modulated according to an electric signal; and a developer carrier disposed downstream of the ion flow modulation means. The recording paper is characterized in that it includes a transfer means for applying an electric charge to the recording paper brought into close contact with the recording paper from the back side thereof.

「実施例コ 以下、図面に基づいて本発明を実施例により詳細に説明
する。``Example'' The present invention will be explained in detail below with reference to the drawings.

まず、第１図は、本発明による画像記録装置の実施例に
よる構成を示す図である。First, FIG. 1 is a diagram showing the configuration of an embodiment of an image recording apparatus according to the present invention.

符号１は、導電性剛体から成る芯体に、弾性体層及び表
面層を積層して成るドナーロール（現像剤担体）である
。Reference numeral 1 denotes a donor roll (developer carrier) made up of a core made of a conductive rigid body, an elastic layer and a surface layer laminated thereon.

符号２は、弾性を有するブレードであって、ドナーロー
ル１に圧接するように設けられており、ドナーロールｌ
の矢印へ方向の回転に伴ない、該ブレード２の部分に搬
送された現像剤としてのトナー３は、ブレード２の当接
部で、薄層にならされ、略一層の均一薄層を形成する。Reference numeral 2 denotes an elastic blade, which is provided so as to come into pressure contact with the donor roll 1.
As the toner 3 is rotated in the direction of the arrow, the toner 3 as a developer transported to the part of the blade 2 is smoothed into a thin layer at the contact portion of the blade 2 to form a substantially single uniform thin layer. .

ドナーロールｌとブレード２とは、この均一なトナ一層
を形成する為に、当接部の全面にわたり、均一な圧力で
圧接している必要がある。ドナーロール１とブレード２
のうち少なくとも一方は、適度な弾性を有している事が
望ましい。In order to form this uniform layer of toner, the donor roll 1 and the blade 2 must be in pressure contact with each other with uniform pressure over the entire surface of the contact portion. Donor roll 1 and blade 2
It is desirable that at least one of them has appropriate elasticity.

更に、ドナーロール１上のトナー３の保持力を強め、搬
送性を向上する為に、トナー３は、十分な電荷を有する
事が望ましく、ドナーロール１、ブレード２、共に、ト
ナー３を所望する極性に摩擦帯電する帯電能の高い材質
により、表面が形成されている事が望ましい。Further, in order to strengthen the holding force of the toner 3 on the donor roll 1 and improve the conveyance property, it is desirable that the toner 3 has sufficient electric charge, and it is desirable that the toner 3 be applied to both the donor roll 1 and the blade 2. It is desirable that the surface be made of a material with high charging ability that is triboelectrically charged in polarity.

具体的には、ニッケル、リン錆銅、アルミニウム、等の
金属、ポリカーボナイト、フγ累樹脂、テフロン樹脂、
シリコン…詣、アクリル（り（脂、ポリウレタンコム、
クロロビレンコ′ム、カーボン分散樹脂、金属酸化物を
分散した樹脂、等が適している。Specifically, metals such as nickel, phosphorus-rusted copper, aluminum, polycarbonite, plastic resin, Teflon resin,
Silicone... Pilgrimage, acrylic (fat, polyurethane com,
Suitable materials include chloropyrene comb, carbon-dispersed resin, and metal oxide-dispersed resin.

トナー３は、樹脂、ワックス、中に、着色顔料を分散し
てなる体積抵抗率１０′３Ωｃｍ以上の絶縁性−成分非
磁性トナーを用いている。The toner 3 is an insulating component non-magnetic toner having a volume resistivity of 10'3 Ωcm or more, which is made by dispersing a colored pigment in resin or wax.

該トナー３は、ブレード２部において、攪拌、摺擦され
、十分に帯電されて、ドナーロール１に静電的に強く付
着して、１１す層を形成しており、このときのトナー３
の帯電電荷量は、１０μｃ／ｇないし３０μｃ／ｇ　程
である。The toner 3 is stirred and rubbed in the blade 2 section, is sufficiently charged, and strongly adheres electrostatically to the donor roll 1 to form a layer 11. At this time, the toner 3
The amount of charged charge is about 10 μc/g to 30 μc/g.

このトナ一層は、電荷付与手段４へ１般送され、画像状
に、トナー３に電荷が付与される。This toner layer is generally sent to the charge applying means 4, and charges are applied to the toner 3 in an imagewise manner.

トナー３に付与する電荷は、摩擦帯電によってトナー３
があらかじめ保持していた電荷と逆の極性であり、ドナ
ーロール１上のトナー３は、画像部と背景部で異なる極
性の電荷を有する様に帯電される。The charge imparted to the toner 3 is caused by frictional charging.
The toner 3 on the donor roll 1 is charged so that the image area and the background area have charges of different polarities.

本発明の実施例に用いる電荷付与手段は、イオン流変調
による帯電手段４であって、その特徴とする所は、第２
図に示す如く、イオン発生手段たるコロナ放電器（コロ
ナワイヤ）８と、該コロナ放電器８で発生したイオンを
強制的に輸送する空気流Ｂと、を有し、空気流の出口近
傍に設けられた制御電極７ａに電気信号を印加する事に
よって、イオンの通過量を制御することができる。なお
、符号７ｂは対向電極を示す。なお、Ｈ，Ｖ、は、印加
される高電圧を示す。The charge applying means used in the embodiments of the present invention is a charging means 4 based on ion flow modulation, and its characteristics are as follows:
As shown in the figure, it has a corona discharger (corona wire) 8 as an ion generating means and an airflow B for forcibly transporting the ions generated by the corona discharger 8, and is provided near the outlet of the airflow. By applying an electric signal to the control electrode 7a, the amount of ions passing through can be controlled. In addition, the code|symbol 7b shows a counter electrode. Note that H and V indicate applied high voltages.

かかる方式においては、制御電極７ａて必要とする印加
電圧が、数〜数十ボルトと十分に低い為に、電荷付与手
段自体に薄膜駆動素子を組み込み、該手段、及びｍＷ全
全体小型化を達成する事が可能である。又、イオンの搬
送に空気流を補助として用いている為に、該空気流をを
さないイオン流変調手段に比べ、電荷の利用効率が、格
段に１ひれており、同一の電荷量を付与するのに要する
時間が短く、高速化を達成できる。In this method, since the voltage required to be applied to the control electrode 7a is sufficiently low at several to several tens of volts, a thin film drive element is incorporated into the charge applying means itself, thereby achieving miniaturization of the means and the entire mW. It is possible to do so. In addition, since air flow is used as an aid for transporting ions, the charge utilization efficiency is significantly higher than that of ion flow modulation means that does not use air flow, and the same amount of charge can be applied. The time required to do this is short and high speed can be achieved.

かかる電荷付与手段４によって、トナ一層に画像状に電
荷を付与する事により、多針電極による接触帯電及び空
気流を有さないイオン流変調による帯電の問題点であっ
た電極の汚れを完全に回避する事が出来る。電極とトナ
一層との接触がないのは、もちろんの事、たとえ、イオ
ン流によって、トナー３及び、ドナーロール１上の異物
の飛び敗りが生じた場合であっても、電荷付与手段の制
御電極７　ａ　５１Ｓから、常に空気流が、流出してい
る為に、これらの飛散したトナーや異物が、電極部及び
、イオン流の出口部に付着する事はなく、イオン流の変
調、及び、トナー３への電荷の付与は極めて安定に行な
われる。By applying a charge image-wise to one layer of the toner using the charge applying means 4, it is possible to completely eliminate the contamination of the electrode, which has been a problem with contact charging due to multi-needle electrodes and charging due to ion flow modulation without air flow. It can be avoided. Of course, there is no contact between the electrode and the toner layer, and even if the toner 3 and foreign matter on the donor roll 1 fly off due to the ion flow, the control of the charge applying means Since the air flow is constantly flowing out from the electrode 7 a 51S, these scattered toners and foreign substances do not adhere to the electrode part or the exit part of the ion flow, and the ion flow is modulated and The charge is applied to the toner 3 extremely stably.

電荷付与手段４によって画像状に電荷を付与されたトナ
一層は、次に、転写部へ送られる。転写部においては、
転写コロトロン５により、記録紙６と密着した状態で、
記録紙６の裏側より、トナー３が摩擦帯電によって有す
る電荷の極性と同じ極性の電荷を付与する事によって、
トナ一層中に存し電荷付与手段４によって帯電極性を変
えられた画像部トナーのみを、記録紙６上へ転移せしめ
て記り、炙画像を肖ることができる。なお、第１図では
、転写コロトロン５による電荷付与を例示しているが、
導電性部材で構成され電圧を印加された転写ロールや転
写ブラシ等の手段であっても良く、コロナ放電器に限定
されるものではない。なお、矢印Ｃは、記録紙６の移動
方向を示す。The single layer of toner imagewise charged by the charge applying means 4 is then sent to the transfer section. In the transcription department,
With the transfer corotron 5 in close contact with the recording paper 6,
By applying an electric charge of the same polarity as the electric charge that the toner 3 has due to frictional charging from the back side of the recording paper 6,
Only the toner in the image area, which is present in the toner layer and whose charged polarity has been changed by the charge applying means 4, is transferred onto the recording paper 6 and recorded, thereby producing a roasted image. Although FIG. 1 shows an example of charge application by the transfer corotron 5,
It may be a transfer roll or a transfer brush made of a conductive member and applied with a voltage, and is not limited to a corona discharger. Note that arrow C indicates the direction in which the recording paper 6 moves.

なお、本発明による画像記録装置によれば、わずかな構
成変更によって、反転画像を得る事が出来る。すなわち
、転写手段によって記録紙に付与する電荷の極性を、ト
ナーが摩擦帯電によって有する電荷と逆の極性とする事
によって、電荷付与手段によって電荷を付与されなかっ
た８６分、すなわち背景部のみを選択的に記録紙に転移
せしめる事が出来、制御電極に加える電気信号をすべて
反転するといった駆動回路の複雑さなしで、容易に反転
画像を得る事が出来る。In addition, according to the image recording apparatus according to the present invention, an inverted image can be obtained by a slight configuration change. That is, by setting the polarity of the charge applied to the recording paper by the transfer means to be the opposite polarity to the charge that the toner has due to frictional charging, only the 86 minutes to which no charge was applied by the charge applying means, that is, the background portion, are selected. The inverted image can be easily transferred to the recording paper, and an inverted image can be easily obtained without the complexity of a drive circuit such as inverting all the electrical signals applied to the control electrodes.

「発明の効果」 以上説明したように、本発明によれば、簡易な構成で電
気信号に応じた画像を記録でき、更に、低い信号電圧で
駆動でき、信頼性の高い画像記録装置を提供できる。"Effects of the Invention" As explained above, according to the present invention, it is possible to provide an image recording device that can record an image according to an electric signal with a simple configuration, can be driven with a low signal voltage, and is highly reliable. .

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

第１図は本発明による画像記録装置の実施例の構成図、 第２図は本発明に用いる電荷付与手段の実施例の構成を
示す図である。 １・・・・・・ドナーロール、２・・・・・・プレート
、３・・・・・・トナー、４・・・・・・電荷付与手段
、５・・・・・・転写コロトロン、　６・・・・・・記
録紙、７ａ・・・・・・制御電極、７ｂ・・・・・・対
向電極ζ８・・・・・・コロナワイヤ。 第１図FIG. 1 is a block diagram of an embodiment of an image recording apparatus according to the present invention, and FIG. 2 is a diagram showing the structure of an embodiment of a charge applying means used in the present invention. DESCRIPTION OF SYMBOLS 1... Donor roll, 2... Plate, 3... Toner, 4... Charge imparting means, 5... Transfer corotron, 6 ... Recording paper, 7a ... Control electrode, 7b ... Counter electrode ζ8 ... Corona wire. Figure 1

Claims (2)

【特許請求の範囲】[Claims] （１）現像剤担体上に保持され単一極性に帯電した現像
剤薄層に、該現像剤と逆極性のイオン流であって電気信
号に応じて変調したイオン流により、画像状に電荷を与
えるイオン流変調手段と、該イオン流変調手段の下流に
配置され、現像剤担体に密着させられた記録紙にその裏
面から電荷を付与する転写手段と、 を含むことを特徴とする画像記録装置。(1) A thin layer of developer held on a developer carrier and charged to a single polarity is image-wise charged by an ion flow having a polarity opposite to that of the developer and modulated according to an electrical signal. an ion flow modulating means for applying an ion flow; and a transfer means disposed downstream of the ion flow modulating means for applying an electric charge to a recording paper that is brought into close contact with a developer carrier from the back surface of the recording paper. . （２）前記イオン流変調手段は、イオン発生手段と、イ
オンを強制的に搬送する空気流と、各画素に対応した制
御電極と、を有し、該制御電極に電気信号を印加し、イ
オン流を変調する特許請求の範囲第（１）項記載の装置
。(2) The ion flow modulation means has an ion generation means, an air flow that forcibly transports ions, and a control electrode corresponding to each pixel, and applies an electric signal to the control electrode to cause the ion to flow. A device according to claim 1 for modulating flow.
JP18733884A 1984-09-07 1984-09-07 Image recording device Pending JPS6165270A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18733884A JPS6165270A (en) 1984-09-07 1984-09-07 Image recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18733884A JPS6165270A (en) 1984-09-07 1984-09-07 Image recording device

Publications (1)

Publication Number Publication Date
JPS6165270A true JPS6165270A (en) 1986-04-03

Family

ID=16204248

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18733884A Pending JPS6165270A (en) 1984-09-07 1984-09-07 Image recording device

Country Status (1)

Country Link
JP (1) JPS6165270A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61110185A (en) * 1984-11-05 1986-05-28 Ricoh Co Ltd Recording device
EP0401749A2 (en) * 1989-06-05 1990-12-12 Seiko Epson Corporation Wet recording apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61110185A (en) * 1984-11-05 1986-05-28 Ricoh Co Ltd Recording device
EP0401749A2 (en) * 1989-06-05 1990-12-12 Seiko Epson Corporation Wet recording apparatus

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