JPH0542711A - Electrostatic recording device - Google Patents
Electrostatic recording deviceInfo
- Publication number
- JPH0542711A JPH0542711A JP20022191A JP20022191A JPH0542711A JP H0542711 A JPH0542711 A JP H0542711A JP 20022191 A JP20022191 A JP 20022191A JP 20022191 A JP20022191 A JP 20022191A JP H0542711 A JPH0542711 A JP H0542711A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- electrode
- developer
- magnetic toner
- toner
- 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
Landscapes
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Electrophotography Using Other Than Carlson'S Method (AREA)
- Dot-Matrix Printers And Others (AREA)
Abstract
Description
【0001】[0001]
【発明の技術分野】この発明は、記録ヘッドと記録媒体
を接触させずに静電記録画像を形成する非接触式静電記
録装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type electrostatic recording apparatus which forms an electrostatically recorded image without bringing a recording head and a recording medium into contact with each other.
【0002】[0002]
【従来技術とその問題点】従来、普通紙を用いることが
でき、且つ、画像媒体と記録電極先端との微小間隔を正
確に確保できる静電記録方式として、ドラム状の中間記
録媒体上にトナー画像を形成し、そのトナー画像を用紙
上に転写する方式が用いられている。この方式による場
合、中間記録媒体を用いる為に装置が大型化する傾向が
ある。そこで、記録と現像を同時に行なうプロセスを採
用し装置の大型化を回避する方式が採用されている。こ
の方式では、記録電極を現像剤搬送路の中間記録媒体を
兼ねる対向電極に対向する位置に幅方向(主走査方向)
へ並列設置し、その電極対向部で記録情報に応じ搬送さ
れてくる現像剤を選択的に記録電極上から転移させてト
ナー記録画像を形成する。2. Description of the Related Art Conventionally, as an electrostatic recording system in which plain paper can be used and a minute gap between the image medium and the tip of the recording electrode can be accurately secured, toner is formed on a drum-shaped intermediate recording medium. A method of forming an image and transferring the toner image onto a sheet is used. In the case of this method, the size of the device tends to increase because an intermediate recording medium is used. Therefore, a method is adopted in which a process of simultaneously performing recording and development is adopted to avoid an increase in size of the apparatus. In this method, the recording electrode is placed in a width direction (main scanning direction) at a position facing a counter electrode that also serves as an intermediate recording medium in the developer transport path.
Are arranged in parallel with each other, and the toner conveyed image is formed by selectively transferring the developer conveyed according to the record information at the electrode facing portion from the recording electrode.
【0003】上述の静電記録方式では、通常、現像剤と
して磁性トナー等の磁性現像剤を用い、マグネットロー
ル等の磁界発生手段によって、現像剤の穂を形成しつつ
電極対向部に現像剤を搬送する。その場合、電極対向部
の対向電極上に形成したトナー記録画像が記録電極側に
残留する現像剤の穂により乱される傾向がある。In the above electrostatic recording system, a magnetic developer such as a magnetic toner is usually used as the developer, and the magnetic field generating means such as a magnet roll forms the ears of the developer while the developer is applied to the electrode facing portion. Transport. In that case, the toner recording image formed on the counter electrode in the electrode facing portion tends to be disturbed by the ears of the developer remaining on the recording electrode side.
【0004】[0004]
【発明の目的】この発明は、上述した従来技術の問題点
に鑑みなされたものであって、画像乱れの無い高品質な
記録画像を長期に亘り安定して形成可能な静電記録装置
を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides an electrostatic recording apparatus capable of stably forming a high-quality recorded image without image distortion for a long period of time. The purpose is to do.
【0005】[0005]
【発明の要点】この発明は、上述した目的を達成するた
めに、所定の経路に沿って敷設した現像剤担持部材と、
該現像剤担持部材の表面に沿って現像剤を搬送する現像
剤搬送手段と、前記現像剤担持部材の表面に間隔を保っ
て並設した記録電極と、該記録電極に対向配置した対向
電極とを有し、各前記記録電極に記録情報に応じて電圧
を印加し、搬送されてきた現像剤を前記対向電極側へ選
択的に転移させる静電記録装置において、前記記録電極
の先端を前記現像剤担持部材と前記対向電極表面が最近
接する位置より現像剤搬送方向上流側へ微小距離だけず
らせて位置させ、前記現像剤担持部材の前記記録電極の
先端対応位置に下流側に向って落ちる段差を形成すると
共に該段差の大きさを前記現像剤が形成する穂の高さよ
り大きく設定したことを要点とする。SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention comprises a developer carrying member laid along a predetermined path,
A developer carrying means for carrying a developer along the surface of the developer carrying member, recording electrodes arranged in parallel on the surface of the developer carrying member, and a counter electrode arranged opposite to the recording electrode. In the electrostatic recording apparatus, which has a voltage applied to each of the recording electrodes according to recording information and selectively transfers the conveyed developer to the counter electrode side, The developer carrying member and the surface of the counter electrode are positioned so as to be shifted by a minute distance upstream from the position where the counter electrode surface is closest to the developer carrying member, and a step which falls toward the downstream side at a position corresponding to the tip of the recording electrode of the developer carrying member is formed. The point is that the size of the step is set to be larger than the height of the ears formed by the developer while being formed.
【0006】[0006]
【発明の実施例】以下、この発明を図1乃至図8に示す
実施例に基づいて具体的に説明する。図1は本発明の一
実施例としての記録装置の全体構成を示す模式的断面図
である。同図において、1は普通紙Pを積載収納した給
紙カセットであり、機体側方に挿脱自在に装着してあ
る。挿着した給紙カセット1の先端部上方には、給紙コ
ロ1aが矢印方向に駆動回転可能に配設してある。給紙
コロ1aの前方には、絶縁部材よりなる上、下搬送ガイ
ド板2a,2bを敷設して用紙搬入経路を形成してあ
る。この用紙搬入経路中には、待機ロール対3を配設し
てあり、給紙コロ1aにより繰り出された用紙Pの進行
を一旦停止させて搬送姿勢を整えた後、下流側の画像転
写部Tへ後述する記録画像の到達タイミングと同期する
様に再給送する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in FIGS. FIG. 1 is a schematic cross-sectional view showing the overall configuration of a recording apparatus as an embodiment of the present invention. In the figure, reference numeral 1 is a paper feed cassette in which plain papers P are stacked and housed, and is attached to the side of the machine so as to be freely inserted and removed. A paper feed roller 1a is disposed above the leading end of the inserted paper feed cassette 1 so as to be rotatable in the arrow direction. In front of the paper feed roller 1a, upper and lower transport guide plates 2a and 2b made of an insulating member are laid to form a paper carry-in path. A standby roll pair 3 is arranged in the sheet carrying-in path, and after temporarily stopping the progress of the sheet P fed by the sheet feeding roller 1a to adjust the conveying posture, the image transfer unit T on the downstream side is provided. The sheet is re-fed so as to be synchronized with the arrival timing of the recorded image described later.
【0007】待機ロール対3下流側の画像転写部Tに
は、転写帯電器4を像担持体を兼ねる円筒電極5の上部
周面に対向配置してある。円筒電極5は、後述する記録
電極の対向電極となるもので、本例では矢印イで示す反
時計回り方向に駆動回転する。この円筒電極5には、後
述する現像剤中のトナーの帯電極性と同極性のバイアス
電圧を印加可能なバイアス電源5aを接続してある。円
筒電極5の反対側の周表面には、後述する記録画像形成
ユニットUを対向設置してある。この記録画像形成ユニ
ットUにより円筒電極5表面にトナー記録画像が形成さ
れ、円筒電極5の回転と共にトナー記録画像が画像転写
部Tへ搬送され、再給送されてくる用紙上に転写され
る。記録画像形成ユニットUの構成については、後程詳
細に説明する。In the image transfer portion T on the downstream side of the standby roll pair 3, a transfer charger 4 is arranged so as to face the upper peripheral surface of a cylindrical electrode 5 which also serves as an image carrier. The cylindrical electrode 5 serves as a counter electrode of a recording electrode which will be described later, and in this example, the cylindrical electrode 5 is driven and rotated in a counterclockwise direction indicated by an arrow a. A bias power source 5a capable of applying a bias voltage having the same polarity as the charging polarity of the toner in the developer described later is connected to the cylindrical electrode 5. A recording image forming unit U, which will be described later, is installed opposite to the peripheral surface on the opposite side of the cylindrical electrode 5. A toner recording image is formed on the surface of the cylindrical electrode 5 by the recording image forming unit U, and the toner recording image is conveyed to the image transfer portion T with the rotation of the cylindrical electrode 5 and transferred onto the sheet fed again. The configuration of the recording image forming unit U will be described later in detail.
【0008】画像転写部Tの下流側には、分離爪6を先
端を円筒電極周面に圧接させて配設してある。そして、
分離爪6の下流側には、エアーサクション方式の搬送ベ
ルト7を水平方向に張設してあり、記録画像の転写を終
え分離爪6により円筒電極5周面から分離された用紙の
裏面を吸引しつつその前方に設けられている定着器8に
向けて搬送する。定着器8は加熱ロール8aと圧接ロー
ル8bから成り、両ロール間に用紙を挾持し搬送する際
にトナー像を熱定着する。定着を終えた用紙は、排出口
9から画像面を下にしたフェイスダウン状態で排紙トレ
イ10上に排出積載される。On the downstream side of the image transfer portion T, a separating claw 6 is arranged with its tip pressed against the peripheral surface of the cylindrical electrode. And
An air suction type conveyor belt 7 is horizontally stretched on the downstream side of the separation claw 6 to suck the back surface of the sheet separated from the peripheral surface of the cylindrical electrode 5 by the separation claw 6 after the transfer of the recorded image is completed. While carrying out, it conveys toward the fixing device 8 provided in the front. The fixing device 8 is composed of a heating roll 8a and a pressure contact roll 8b, and heat-fixes the toner image when the paper is sandwiched and conveyed between the rolls. The fixed sheet is discharged and stacked on the discharge tray 10 from the discharge port 9 in a face-down state with the image side facing down.
【0009】以上の如く、本例の記録装置においては、
用紙の給紙から排紙に至る全用紙搬送経路が略ストレー
ト状に形成されている為、通紙動作が全般的に滑らかで
あり、画像不良やジャム等の通紙不良が発生し難い。
又、記録装置にとって好ましいページ揃えが不要なフェ
イスダウン排紙状態を上述のストレート通紙経路で得る
ことができるという利点も備えている。As described above, in the recording apparatus of this example,
Since the entire sheet transport path from sheet feeding to sheet ejection is formed in a substantially straight shape, the sheet passing operation is generally smooth, and sheet defects such as image defects and jams are unlikely to occur.
In addition, there is an advantage that a face-down sheet discharge state that does not require page alignment, which is preferable for the recording apparatus, can be obtained by the straight sheet passage.
【0010】ここで、記録画像形成ユニットUの詳細な
構成について説明する。記録画像形成ユニットUは、図
2に示す様に、大略、補給用現像剤d0を貯留する現像
剤貯留槽11及び記録手段と現像手段を備えた現像記録
槽12等から成る。現像剤貯留槽11内には、撹拌羽根
11aを回動可能に配設してある。本例では、現像剤と
して、少なくとも絶縁性樹脂、磁性微粉末及び着色剤粒
子を含有する一成分現像剤で、負(−)の摩擦帯電極性
を備えた絶縁磁性トナーを使用する。尚、現像剤として
は、磁性体キャリヤと絶縁性トナーを所定の割合で混合
した二成分磁性現像剤も使用できる。Now, the detailed structure of the recording image forming unit U will be described. As shown in FIG. 2, the recording image forming unit U is roughly composed of a developer storage tank 11 for storing a replenishment developer d0, a developing recording tank 12 having a recording means and a developing means, and the like. A stirring blade 11a is rotatably arranged in the developer storage tank 11. In this example, the developer is a one-component developer containing at least an insulating resin, magnetic fine powder and colorant particles, and an insulating magnetic toner having a negative (−) triboelectrification polarity is used. As the developer, it is possible to use a two-component magnetic developer in which a magnetic carrier and an insulating toner are mixed in a predetermined ratio.
【0011】現像記録槽12の底部には、図3に示す現
像剤の水平循環経路13を形成してある。図3におい
て、この水平循環経路13における一対の平行な長手経
路13a,13b中には、一対のオーガロール14a,
14bを回転自在に設置してある。各オーガロール14
a,14bは、各シャフト14a1,14b1の周面に複
数の螺旋羽根14a2,14b2を立設し、夫々の片側端
部に螺旋方向が逆の逆送り羽根14a3,14b3を立設
して成る(図6の斜視図参照)。そして、夫々の逆送り
羽根14a3,14b3が互いに反対側に位置する様に、
各オーガロール14a,14bを長手経路13a,13
b内に夫々配置する。これら一対のオーガロール14
a,14bを、矢印ロ,ハで示す様に互いに反対方向で
且つ逆送り羽根14a3,14b3に向って現像剤を搬送
する方向に駆動回転する。これにより、逆送り羽根14
a3,14b3を設けた各コーナー部では、互いに向い合
う逆方向の搬送力が衝突し、現像剤が直角方向に突き出
され他方の長手経路側へ流動する。この様にして、現像
剤を本例では破線矢印ニで示す方向に撹拌しつつ循環流
動させ、この際に現像剤を充分に摩擦帯電させることが
できる。尚、オーガロール14a,14bの材質や形状
を変えることにより、現像剤に必要な帯電量を充分に摩
擦帯電させることができる。At the bottom of the developing / recording tank 12, a horizontal circulation path 13 for the developer shown in FIG. 3 is formed. In FIG. 3, in the pair of parallel longitudinal paths 13a and 13b in the horizontal circulation path 13, a pair of auger rolls 14a,
14b is rotatably installed. Each auger roll 14
a and 14b have a plurality of spiral blades 14a2 and 14b2 provided upright on the peripheral surface of the shafts 14a1 and 14b1, respectively, and reverse feed blades 14a3 and 14b3 having opposite spiral directions provided upright at one end of each of them. (See perspective view of FIG. 6). And, so that the respective reverse feed blades 14a3, 14b3 are located on the opposite sides,
The auger rolls 14a, 14b are connected to the longitudinal paths 13a, 13
Place each in b. These pair of auger rolls 14
The a and 14b are driven and rotated in directions opposite to each other as indicated by arrows B and C and in a direction in which the developer is conveyed toward the reverse feed blades 14a3 and 14b3. As a result, the reverse feed blade 14
At the corners where a3 and 14b3 are provided, the conveying forces in the opposite directions, which face each other, collide with each other, and the developer is ejected at a right angle and flows to the other longitudinal path side. In this way, the developer can be circulated and flowed while being stirred in the direction indicated by the broken arrow D in this example, and at this time, the developer can be sufficiently tribocharged. By changing the material and shape of the auger rolls 14a and 14b, the amount of charge required for the developer can be sufficiently frictionally charged.
【0012】上述の様に構成した水平循環経路13の中
央部には、循環する現像剤が侵入しない様に周囲を壁S
wで囲繞した空間Sを形成してある。そして、図2に示
す様に、現像剤貯留槽11に近い方のオーガロール14
aの上方には、補給用磁性トナーd0の補給口11bを
オーガロール14aの軸方向に沿って穿設してある。The central portion of the horizontal circulation path 13 constructed as described above is surrounded by a wall S so that the circulating developer does not enter.
A space S surrounded by w is formed. Then, as shown in FIG. 2, the auger roll 14 closer to the developer storage tank 11 is provided.
A replenishment port 11b for the replenishment magnetic toner d0 is formed in the upper part of a along the axial direction of the auger roll 14a.
【0013】図2において、オーガロール14bの上方
には、現像剤の垂直搬送経路を形成する現像剤担持部材
としての現像スリーブ15を、軸を水平方向に延在させ
て設置してある。現像スリーブ15は、内部に現像剤搬
送手段としてのマグネットロール16を回転自在に内蔵
し、前述した円筒電極5に対向配置してある。マグネッ
トロール16の周表面には異なる磁極を交互に着磁して
あり、このマグネットロール16を矢印ホで示す反時計
回り方向に駆動回転することにより、磁性トナーdが現
像スリーブ15周表面に沿って垂直方向の破線矢印ヘで
示す時計回り方向に搬送される。In FIG. 2, above the auger roll 14b, a developing sleeve 15 as a developer carrying member that forms a vertical conveying path for the developer is installed with its axis extending horizontally. The developing sleeve 15 rotatably incorporates a magnet roll 16 as a developer conveying means therein, and is arranged so as to face the cylindrical electrode 5 described above. Different magnetic poles are alternately magnetized on the circumferential surface of the magnet roll 16, and the magnetic toner d is driven along the circumferential surface of the developing sleeve 15 by driving and rotating the magnet roll 16 in the counterclockwise direction indicated by arrow E. And is conveyed in a clockwise direction indicated by a vertical broken arrow.
【0014】現像スリーブ15周表面近傍で円筒電極5
周表面に近接する対向部のトナー搬送方向に対し上流側
には、搬送されてくる磁性トナーdの穂の高さを所定高
さに規制するドクタブレード12aを配設してある。
又、ドクタブレード12aの上方には、トナー飛散防止
板12bを配設してある。このトナー飛散防止板12b
は、ドクタブレード12aによる層厚規制を受けて下流
側に搬送される現像剤が記録画像形成ユニットU外に飛
散し画像を汚す不都合を防止する為に設けてある。本例
では、現像記録槽12の槽壁の上端部を二股に分岐さ
せ、ドクタブレード12aとトナー飛散防止板12bに
夫々形成してある。The cylindrical electrode 5 is formed near the peripheral surface of the developing sleeve 15.
A doctor blade 12a for restricting the height of the bristles of the magnetic toner d being conveyed to a predetermined height is arranged on the upstream side in the toner conveying direction of the facing portion close to the peripheral surface.
A toner scattering prevention plate 12b is arranged above the doctor blade 12a. This toner scattering prevention plate 12b
Is provided to prevent the inconvenience that the developer conveyed downstream due to the layer thickness regulation by the doctor blade 12a is scattered outside the recording image forming unit U and stains the image. In this example, the upper end of the tank wall of the development recording tank 12 is bifurcated and formed on the doctor blade 12a and the toner scattering prevention plate 12b, respectively.
【0015】上述したトナー穂高規制部のトナー搬送方
向ヘに関して下流側には、円筒電極5周表面にトナー記
録画像を形成する記録部Wを次の様に構成してある。図
4に示す様に、現像スリーブ15周表面で、円筒電極5
周表面の現像スリーブ15側に最近接する位置Ncと対
向する位置より微小距離Rだけ上流側の位置に、段差G
を形成してある。この微小距離Rは、例えば、円筒電極
5の外径が20mm、現像スリーブ15の外径が23mmと
すれば、1mm程度が好適である。段差Gは、現像スリー
ブ15周表面の幅方向全域に亘り形成してある。A recording unit W for forming a toner recording image on the peripheral surface of the cylindrical electrode 5 is arranged as follows on the downstream side of the toner spike height regulating unit in the toner conveying direction. As shown in FIG. 4, the cylindrical electrode 5 is formed on the peripheral surface of the developing sleeve 15.
A step G is provided at a position upstream of the position Nc closest to the developing sleeve 15 side on the peripheral surface by a minute distance R.
Has been formed. For example, when the outer diameter of the cylindrical electrode 5 is 20 mm and the outer diameter of the developing sleeve 15 is 23 mm, the minute distance R is preferably about 1 mm. The step G is formed over the entire widthwise direction of the peripheral surface of the developing sleeve 15.
【0016】而して、段差Gの大きさは、後述する様に
して円筒電極5周表面に形成されるトナー記録画像の乱
れを防止する為、段差Gの下流側に搬送された残留磁性
トナーd′が形成する穂の高さより大きく設定してあ
る。画像の乱れの原因となる段差下流側における残留磁
性トナーd′の穂は、次の様にして形成される。The size of the step G is set so that the residual magnetic toner conveyed to the downstream side of the step G can prevent disturbance of the toner recording image formed on the peripheral surface of the cylindrical electrode 5 as described later. The height is set larger than the height of the spike formed by d '. The ears of the residual magnetic toner d ′ on the downstream side of the step, which causes the image disturbance, are formed as follows.
【0017】図5に示す様に、磁性トナーd′の穂は、
段差G下流側の現像スリーブ15表面でマグネットロー
ル16の磁極に対向する位置に形成される。この場合、
先ず1個目の磁性トナー粒子d1′が、マグネットロー
ル16の磁気勾配力Fm1により磁極上の位置で引き付け
保持される。この磁性トナー粒子d1′は磁性体である
から磁力線を集束させる。その結果、磁性トナーd1′
上に磁気勾配力Fm1より強い磁気勾配力Fm2が形成さ
れ、2個目の磁性トナー粒子d2′がその上に保持され
る。同様にして、2個目の磁性トナーd2′上に、順
次、磁性トナー粒子d3′,…dn′,d(n+1)′が積み
上げられて穂が形成される。然るに、マグネットロール
16による磁場の強さは、磁極から離隔するにつれて弱
くなる。従って、磁性トナーd′の穂が或る程度の高さ
になると、多数の磁力線が集束されてもこれらを合わせ
た全体の磁気勾配力は小さくなり、磁性トナーd′の穂
は一定の高さ以上には成長しない。即ち、例えばn個の
磁性トナー粒子d1′〜dn′が連なって高さがhの穂が
形成されている場合、(n+1)個目の磁性トナー粒子d
(n+1)′に作用する磁気勾配力Fm(n+1)は、 Fm1>Fm(n+1) となる。その結果、(n+1)個目の磁性トナー粒子d(n
+1)は、より強い磁気勾配力Fm1で現像スリーブ15表
面上に保持されることになり、磁性トナーdの穂の高さ
がhに決まる。As shown in FIG. 5, the ears of the magnetic toner d'are
It is formed at a position facing the magnetic pole of the magnet roll 16 on the surface of the developing sleeve 15 on the downstream side of the step G. in this case,
First, the first magnetic toner particle d1 'is attracted and held at the position on the magnetic pole by the magnetic gradient force Fm1 of the magnet roll 16. Since the magnetic toner particles d1 'are magnetic substances, they concentrate the magnetic force lines. As a result, the magnetic toner d1 '
A magnetic gradient force Fm2 stronger than the magnetic gradient force Fm1 is formed on the upper side, and the second magnetic toner particles d2 'are held thereon. Similarly, magnetic toner particles d3 ', ... dn', d (n + 1) 'are sequentially stacked on the second magnetic toner d2' to form ears. However, the strength of the magnetic field generated by the magnet roll 16 becomes weaker as it is separated from the magnetic pole. Therefore, when the height of the magnetic toner d'has reached a certain height, the magnetic gradient force of the magnetic toner d'becomes small even if a large number of magnetic force lines are focused, and the height of the magnetic toner d'has a constant height. Does not grow any further. That is, for example, when n magnetic toner particles d1 'to dn' are connected to form a spike having a height h, the (n + 1) th magnetic toner particle d is formed.
The magnetic gradient force Fm (n + 1) acting on (n + 1) 'is Fm1> Fm (n + 1). As a result, the (n + 1) th magnetic toner particle d (n
+1) is held on the surface of the developing sleeve 15 by a stronger magnetic gradient force Fm1, and the height of the spikes of the magnetic toner d is determined by h.
【0018】上述した磁性トナーの穂の形成メカニズム
から分かる様に、磁性トナーdの穂の高さhは、磁性ト
ナーの磁化、磁性トナー粒子の粒径(粒径により磁力線
の集束度合いが異なる)、及びマグネットロール16の
磁極数とその磁束密度等に依り変化する。従って、磁性
トナーd′の磁化及び粒径が大きい程、磁性トナーd′
の穂の高さhが大きくなるから、それらに応じて段差G
もそれより大きく設定する必要がある。又、マグネット
ロール16の磁極数と磁束密度が小さい程、穂の高さh
が大きくなるから、それらに応じて段差Gの大きさを同
様に大きくする必要がある。As can be seen from the above-mentioned formation mechanism of the magnetic toner ears, the height h of the ears of the magnetic toner d depends on the magnetization of the magnetic toner and the particle size of the magnetic toner particles (the degree of focusing of magnetic force lines varies depending on the particle size). , And the number of magnetic poles of the magnet roll 16 and its magnetic flux density. Therefore, the larger the magnetization and particle size of the magnetic toner d ', the greater the magnetic toner d'.
Since the height h of the spikes becomes large, the step G
Also needs to be set larger than that. Also, the smaller the number of magnetic poles and the magnetic flux density of the magnet roll 16, the height h of the spikes
Therefore, the size of the step G needs to be increased correspondingly.
【0019】図4に戻って、上述の段差Gから上流側の
現像スリーブ15周表面には、多数の記録電極を備えた
記録電極シート17を被着敷設してある。記録電極シー
ト17では、図6の斜視図に示す様に、多数の記録電極
線17aを、現像スリーブ15周表面の周方向に沿わせ
るシート長手方向へ互いに平行に延在させると共に、所
定の微細ピッチでシート幅方向(トナー搬送路幅方向:
主走査方向)へ並設してある。記録電極線17aの数
は、主走査1ライン分の最大データ数に対応させてあ
る。本例の記録電極シート17は可撓性印刷回路基板
(FPC)で構成してあり、多数の非磁性導電材料から
なる記録電極線17aを、可撓性絶縁材料からなるベー
スフィルム17b上に40μmの間隙を保って84.6
μmピッチ(300DPI)の密度で敷設形成してあ
る。Returning to FIG. 4, a recording electrode sheet 17 having a large number of recording electrodes is laid on the peripheral surface of the developing sleeve 15 upstream from the step G. In the recording electrode sheet 17, as shown in the perspective view of FIG. 6, a large number of recording electrode wires 17a are extended in parallel with each other in the sheet longitudinal direction along the circumferential direction of the peripheral surface of the developing sleeve 15 and at a predetermined fine pitch. Sheet width direction at pitch (toner conveyance path width direction:
They are arranged side by side in the main scanning direction). The number of recording electrode lines 17a corresponds to the maximum number of data for one main scanning line. The recording electrode sheet 17 of this example is composed of a flexible printed circuit board (FPC), and a large number of recording electrode lines 17a made of a non-magnetic conductive material are arranged on a base film 17b made of a flexible insulating material to have a thickness of 40 μm. With a gap of 84.6
It is laid and formed with a density of μm pitch (300 DPI).
【0020】記録電極線17a上には、記録画像の形成
に関与する先端部領域Zを除いて、絶縁保護コート17
cを被着してある。絶縁保護コート17cは、電気絶縁
材料から成り、各記録電極線17a間の絶縁性を確保す
ると共に、磁性トナーとの摩擦による記録電極線17a
の摩耗を防止する為に設けてある。この絶縁保護コート
17cを被着していない記録電極線17a先端部Zが、
記録画像を形成する記録電極ELとなる。記録電極EL
上にも絶縁保護コート17cを被着すると、絶縁保護コ
ート17cに磁性トナーとの摩擦により不要な電荷が蓄
積されて地汚れ等の画像不良を引き起こすが、本例のよ
うに記録電極ELを露出させることにより、そのような
不都合の発生を防止でき、又、記録画像を形成するのに
必要な電界を効率良く形成できる。On the recording electrode line 17a, except for the tip region Z related to the formation of a recorded image, the insulating protective coat 17 is formed.
c is attached. The insulating protection coat 17c is made of an electrically insulating material and ensures insulation between the recording electrode wires 17a, and at the same time, the recording electrode wires 17a due to friction with the magnetic toner.
It is provided to prevent abrasion of the. The tip portion Z of the recording electrode wire 17a not covered with the insulating protection coat 17c is
It becomes a recording electrode EL that forms a recorded image. Recording electrode EL
When the insulating protection coat 17c is also applied on the upper surface, unnecessary charges are accumulated on the insulating protection coat 17c due to friction with the magnetic toner and cause image defects such as scumming. However, the recording electrode EL is exposed as in this example. By doing so, such an inconvenience can be prevented, and the electric field necessary for forming a recorded image can be efficiently formed.
【0021】上述の様な構成の記録電極シート17を製
作する場合、銅箔が被着された可撓性絶縁材からなるベ
ースフィルム17bにエッチング加工を施して多数の記
録電極線17aをパターン形成した後、絶縁保護コート
層17cを先端部領域Zを除いた領域に被着すればよ
い。When the recording electrode sheet 17 having the above-mentioned structure is manufactured, a base film 17b made of a flexible insulating material coated with a copper foil is subjected to an etching process to form a large number of recording electrode wires 17a in a pattern. After that, the insulating protection coat layer 17c may be applied to the region excluding the tip region Z.
【0022】図4において、上述の様に構成した記録電
極シート17を、その記録電極ELが並列形成された先
端を段差G位置に揃え、この位置から現像スリーブ15
の上流側周表面に亘り被設してある。この記録電極EL
と円筒電極5周表面とが対向する空間が、記録部Wとな
る。この記録部Wの電極間距離Lは、シャープなドット
で高解像度の記録画像を形成するには可及的に小さい距
離が好ましく、通常は50μm程度に設定する。In FIG. 4, in the recording electrode sheet 17 having the above-described structure, the leading ends of the recording electrodes EL formed in parallel are aligned with the step G position, and from this position the developing sleeve 15 is formed.
Is provided over the peripheral surface on the upstream side. This recording electrode EL
The space where the cylindrical electrode 5 and the peripheral surface of the cylindrical electrode 5 face each other is the recording portion W. The inter-electrode distance L of the recording portion W is preferably as small as possible for forming a high-resolution recorded image with sharp dots, and is usually set to about 50 μm.
【0023】図2において、記録部Wのトナー搬送方向
ヘでの下流側には、前述した水平循環経路13の中央空
間Sを囲繞する壁で現像剤貯留槽12側の壁Sw1を延出
し、その先端を現像スリーブ15周表面に当接させてあ
る。これにより、記録部Wで転移されず現像スリーブ1
5周表面に残留しマグネットロール16の回転と共に搬
送されてきた磁性トナーd′を、水平循環経路13の補
給槽側経路13a上に掻き落とし、磁性トナーd′が中
央空間S内に侵入したり、水平循環経路13を経ずに現
像スリーブ15周面に沿って上流側に直接返送される不
都合を防止する。尚、中央空間Sの周囲壁と別個に、現
像スリーブ15に付着する残留磁性トナーd′を掻き取
る為の専用の平板部材を設けてもよい。この場合、その
掻取り部材を垂直方向に支持し、先端を現像スリーブ1
5周表面上に当接させ、他端部を中央空間S底部まで延
在させればよい。又、掻取り部材を磁性材料で形成すれ
ば、マグネットロール16の磁力を遮断でき、より円滑
な掻き取り搬送効果が得られる。In FIG. 2, on the downstream side of the recording section W in the toner conveying direction, a wall Sw1 on the developer storage tank 12 side is extended by a wall that surrounds the central space S of the horizontal circulation path 13 described above. Its tip is brought into contact with the peripheral surface of the developing sleeve 15. As a result, the developing sleeve 1 is not transferred in the recording portion W.
The magnetic toner d ′ remaining on the surface of the fifth circumference and conveyed along with the rotation of the magnet roll 16 is scraped off onto the replenishment tank side path 13a of the horizontal circulation path 13, and the magnetic toner d ′ enters the central space S. This prevents the inconvenience of being directly returned to the upstream side along the peripheral surface of the developing sleeve 15 without passing through the horizontal circulation path 13. Note that a flat plate member dedicated to scraping off the residual magnetic toner d ′ adhering to the developing sleeve 15 may be provided separately from the peripheral wall of the central space S. In this case, the scraping member is supported in the vertical direction, and the front end is the developing sleeve 1.
It is sufficient to bring them into contact with the surface of the five circumferences and extend the other end to the bottom of the central space S. Further, if the scraping member is made of a magnetic material, the magnetic force of the magnet roll 16 can be blocked, and a smoother scraping and conveying effect can be obtained.
【0024】記録電極シート17は、記録電極EL先端
を段差Gに揃え、これから上流側の約半分の周表面に亘
って敷設し、水平方向に引き出した後垂直に降下させ、
前述した水平循環経路の中央空間S内まで延設してあ
る。この記録電極シート17の垂直延設部には、記録デ
ータに応じて各記録電極ELに記録信号電圧を印加する
複数個の駆動回路素子18を搭載してある。そして、図
5に示す様に、各駆動回路素子18に上述した記録電極
シート17の記録電極線17aをN本づつに分けて夫々
接続してある。この様に、記録電極シート17の駆動回
路素子18を搭載した他端部を中央空間S内に収納設置
することにより、駆動回路素子18を現像剤等の埃から
防御できると共に、現像記録槽12の構造が極めてコン
パクト化される。The recording electrode sheet 17 is arranged such that the recording electrode EL tips are aligned with the step G, and is laid over the peripheral surface of about half of the upstream side from this, and is pulled out in the horizontal direction and then vertically lowered.
It extends to the inside of the central space S of the above-mentioned horizontal circulation path. A plurality of drive circuit elements 18 for applying a recording signal voltage to each recording electrode EL according to recording data are mounted on a vertically extending portion of the recording electrode sheet 17. Then, as shown in FIG. 5, the recording electrode lines 17a of the above-mentioned recording electrode sheet 17 are connected to each drive circuit element 18 by dividing the recording electrode lines 17a into N lines. In this way, by storing and installing the other end of the recording electrode sheet 17 on which the drive circuit element 18 is mounted in the central space S, the drive circuit element 18 can be protected from dust such as developer and the development recording tank 12 can be protected. The structure is extremely compact.
【0025】次に、本例の静電記録装置における記録画
像形成動作について説明する。図2において、マグネッ
トロール16を矢印ホ方向に駆動回転すると、現像スリ
ーブ15の外周面上には、磁性トナー粒子を自転させる
回転磁場が形成される。この回転磁場により、水平循環
経路13b中の磁性トナーdが上方の現像スリーブ15
側に引き付けられ、記録電極シート17上を穂を形成し
つつマグネットロール16の回転方向とは逆の矢印ヘ方
向に搬送される。記録電極シート17表面に沿って上方
に搬送される磁性トナーdは、ドクタブレード12aに
より所定の穂の高さに穂切り規制されて記録部Wに向
う。この搬送中に、磁性トナーdは、磁性トナー同士或
るいは現像剤搬送路となる記録電極シート17の絶縁保
護コート17c表面との摩擦により、負(−)極性に帯
電する。Next, a recording image forming operation in the electrostatic recording apparatus of this example will be described. In FIG. 2, when the magnet roll 16 is driven and rotated in the direction of arrow E, a rotating magnetic field for rotating the magnetic toner particles is formed on the outer peripheral surface of the developing sleeve 15. Due to this rotating magnetic field, the magnetic toner d in the horizontal circulation path 13b is moved upward to the developing sleeve 15
It is attracted to the side, and is conveyed in the direction of the arrow opposite to the rotating direction of the magnet roll 16 while forming a brush on the recording electrode sheet 17. The magnetic toner d, which is conveyed upward along the surface of the recording electrode sheet 17, is regulated by the doctor blade 12a to a predetermined height, and heads toward the recording portion W. During this conveyance, the magnetic toner d is charged to a negative (-) polarity due to friction between the magnetic toners or the surface of the insulating protective coat 17c of the recording electrode sheet 17 which serves as a developer conveyance path.
【0026】図4において、記録部Wでは、記録電極E
Lに対し円筒電極5の周表面が所定の微小間隙Lを保っ
て回転移動しており、この電極間にドクタブレード12
aにより穂切り規制された磁性トナーdの穂が搬入され
る。この様な状態の記録部Wにおいて、各記録電極EL
に対し、前述した様に駆動回路素子が記録データに応じ
て記録信号電圧を選択的に印加する。今例えば、1ビッ
トの記録データが“H”(オン)のときに、1黒ドット
を形成する為、対応する記録電極ELに本例では−20
0Vのオン信号電圧を印加するとする。この場合、記録
電極ELに対向する円筒電極5には、バイアス電源5a
により、磁性トナーdの摩擦帯電極性と同極性のバイア
ス電圧を印加する。本例の場合は磁性トナーdの摩擦帯
電極性が負(−)であるからマイナスのバイアス電圧が
印加され、電圧は−50Vに設定されている。従って、
円筒電極5から記録電極ELに向けて150Vの電位差
に基づく現像電界が形成されている。この様な現像電界
が形成された記録部Wを、磁性トナーdの穂が円筒電極
5周表面と接触しつつ通過する。このとき、負極性に帯
電している磁性トナーdには、電位の高い方へ移動させ
ようとする電界力が作用する。従って、−200Vのオ
ン信号電圧が印加されている記録電極EL上に担持され
た磁性トナーdだけが、選択的に円筒電極5表面に転移
する。In FIG. 4, in the recording portion W, the recording electrode E
The peripheral surface of the cylindrical electrode 5 is rotationally moved with respect to L while maintaining a predetermined minute gap L, and the doctor blade 12 is interposed between the electrodes.
The ears of the magnetic toner d whose ears have been cut off by a are carried in. In the recording portion W in such a state, each recording electrode EL
On the other hand, as described above, the drive circuit element selectively applies the recording signal voltage according to the recording data. Now, for example, when 1-bit recording data is "H" (ON), one black dot is formed.
It is assumed that an ON signal voltage of 0V is applied. In this case, a bias power source 5a is attached to the cylindrical electrode 5 facing the recording electrode EL.
Thus, a bias voltage having the same polarity as the triboelectric charging polarity of the magnetic toner d is applied. In the case of this example, since the triboelectrification polarity of the magnetic toner d is negative (-), a negative bias voltage is applied and the voltage is set to -50V. Therefore,
A developing electric field based on the potential difference of 150 V is formed from the cylindrical electrode 5 toward the recording electrode EL. The ears of the magnetic toner d pass through the recording portion W in which such a developing electric field is formed while contacting with the peripheral surface of the cylindrical electrode 5. At this time, the magnetic toner d, which is negatively charged, is subjected to an electric field force to move it to a higher potential. Therefore, only the magnetic toner d carried on the recording electrode EL to which the ON signal voltage of −200 V is applied is selectively transferred to the surface of the cylindrical electrode 5.
【0027】記録電極ELに−200Vのオン信号電圧
を印加した時点では、図7の(a)に示す様に、円筒電
極5周表面に副走査方向距離Zの範囲に亘って、転移し
た磁性トナーd″が付着している。1黒ドットを形成す
る為のオン信号電圧は、図8に示す様に、時間Tw(1
ドット記録周期)に亘って印加される。この時間Twの
間に円筒電極5周表面が移動する距離SLは、円筒電極
5の周表面移動速度をVDとすると、 SL=Tw・VD である。従って、時間Tw後には、図7の(b)に示す
様に、円筒電極5周表面に転移付着した磁性トナーd″
の内の距離SLに亘る前部df″が、円筒電極5の回転と
共に記録部Wから搬出されている。At the time when an ON signal voltage of -200 V is applied to the recording electrode EL, as shown in FIG. 7A, the magnetism transferred to the circumferential surface of the cylindrical electrode 5 over the range of the distance Z in the sub-scanning direction. Toner d ″ is attached. The ON signal voltage for forming one black dot is, as shown in FIG.
It is applied over the dot recording period). The distance SL that the peripheral surface of the cylindrical electrode 5 moves during this time Tw is SL = Tw.VD, where VD is the peripheral surface moving speed of the cylindrical electrode 5. Therefore, after the time Tw, as shown in FIG. 7B, the magnetic toner d ″ transferred and attached to the circumferential surface of the cylindrical electrode 5 is transferred.
The front portion df ″ over the distance SL within the distance is carried out from the recording portion W as the cylindrical electrode 5 rotates.
【0028】図8に示す様に、ON記録データに対応し
てオン信号電圧が時間Twに亘って印加された後、次順
の記録データがOFFであるとすると、記録信号電圧が
接地電位のオフ信号電圧に切り換えられる。これによ
り、図7の(b)において、円筒電極5からその対応記
録電圧ELに見た電位差が−50Vとなる。その結果、
転移磁性トナーd″(負極性)を記録電極EL側に逆転
移させようとする回収電界が記録部Wに形成され、転移
磁性トナーd″の内の記録部W内に残っている後部d
r″((Z−SL)分)だけが記録電極EL側に回収され
る。従って、円筒電極5周表面上に残るのは、記録部W
から搬出されている前部磁性トナーdf″だけであり、
これが1黒ドットDt(図4参照)を形成する。As shown in FIG. 8, after the ON signal voltage corresponding to the ON recording data is applied for the time Tw, if the next recording data is OFF, the recording signal voltage is the ground potential. Switched to off signal voltage. As a result, in FIG. 7B, the potential difference of the corresponding recording voltage EL from the cylindrical electrode 5 becomes −50V. as a result,
A recovery electric field for reversely transferring the transfer magnetic toner d ″ (negative polarity) to the recording electrode EL side is formed in the recording portion W, and the rear part d of the transfer magnetic toner d ″ remaining in the recording portion W is formed.
Only r ″ ((Z−SL)) is collected on the recording electrode EL side. Therefore, what remains on the circumferential surface of the cylindrical electrode 5 is the recording portion W.
Only the front magnetic toner df ″ that has been carried out from
This forms one black dot Dt (see FIG. 4).
【0029】図4において、本例では、この発明に基づ
き、記録電極ELの先端位置を円筒電極5周表面の最近
接位置Ncとの対向位置から上流側へ微小距離Rだけず
らしてあるから、上述の1黒ドットDtがシャープに形
成される。これは、記録電極EL先端を微小距離Rだけ
ずらすことにより、上述した電界の内のドットの副走査
方向前後端を形成する部分(電界の下流側端部)の電界
を最大限に強く形成でき、ドットの副走査方向前後端の
所謂キレが良くなるからである。In FIG. 4, according to the present invention, based on the present invention, the tip position of the recording electrode EL is shifted from the position facing the closest position Nc on the circumferential surface of the cylindrical electrode 5 to the upstream side by a minute distance R. The one black dot Dt described above is sharply formed. This is because by shifting the tip of the recording electrode EL by a minute distance R, the electric field of the portion forming the front and rear ends of the dots in the sub-scanning direction (downstream end of the electric field) can be formed to the maximum strength. This is because the so-called sharpness at the front and rear ends of the dots in the sub-scanning direction is improved.
【0030】形成された1黒ドットDtは、円筒電極5
の回転と共に下流側に搬送される。一方、転移しなかっ
た残留磁性トナーd′は、記録部Wの下流側に搬出さ
れ、前述したメカニズムで穂を形成する。この残留磁性
トナーd′が形成する穂により、円筒電極5周表面上に
形成された黒ドットDtからなる記録画像が乱される虞
がある。然るに、この発明に基づく実施例では、本例の
様に記録部Wの直下流に穂の高さhより大きい落差を備
えた段差Gを形成してあるから穂の先端が黒ドットDt
に接触せず、記録画像を乱す不都合が確実に防止され
る。The formed 1 black dot Dt corresponds to the cylindrical electrode 5
Is conveyed to the downstream side with the rotation of. On the other hand, the residual magnetic toner d ′ that has not transferred is carried out to the downstream side of the recording unit W and forms the ears by the mechanism described above. The ears formed by the residual magnetic toner d'may disturb the recorded image formed of the black dots Dt formed on the circumferential surface of the cylindrical electrode 5. However, in the embodiment based on the present invention, as in this embodiment, the step G having a head larger than the height h of the spikes is formed immediately downstream of the recording portion W, so that the tips of the spikes are black dots Dt.
The inconvenience that the printed image is not disturbed without disturbing the recording medium is reliably prevented.
【0031】図1において、円筒電極5表面に形成され
たトナー記録画像は、円筒電極5の反時計回り方向イの
回転と共に画像転写部Tへ搬送され、ここで待機ロール
対3によりタイミングを測って再給送されてくる用紙上
に転写される。尚、上述のトナー記録画像の濃度を調節
するには、バイアス電源5aのバイアス電圧を変化させ
ればよい。その場合、適切な調節範囲は0〜−50V程
度であり、0Vに近い程、画像濃度が高くなる。In FIG. 1, the toner recording image formed on the surface of the cylindrical electrode 5 is conveyed to the image transfer portion T together with the rotation of the cylindrical electrode 5 in the counterclockwise direction (a), and the timing is measured by the standby roll pair 3 here. And is transferred onto the paper that is re-fed. The bias voltage of the bias power source 5a may be changed to adjust the density of the toner recording image. In that case, an appropriate adjustment range is about 0 to -50V, and the closer to 0V, the higher the image density.
【0032】図2において、記録部Wを通過し段差G
(図4参照)を経た残留磁性トナーd′の穂は、マグネ
ットロール16の回転と共に下流側に移動し、掻取り壁
Sw1により現像スリーブ15表面から掻き取られてオー
ガロール14aに落下し、補給口11bから補給される
磁性トナーd0と撹拌混合される。オーガロール14a
の回転と共に、落下返送された磁性トナーd′と補給用
磁性トナーd0が混合撹拌されつつ循環搬送される。図
3において、破線矢印ニ方向に循環搬送される磁性トナ
ーは、反補給側の長手経路13bを搬送される際に、そ
の上方に延在するマグネットロール16の回転磁界によ
り再度垂直方向に搬送される。In FIG. 2, a step G passing through the recording portion W is formed.
The bristles of the residual magnetic toner d ′ that have passed through (see FIG. 4) move to the downstream side as the magnet roll 16 rotates, and are scraped off from the surface of the developing sleeve 15 by the scraping wall Sw1 and fall to the auger roll 14a for replenishment. The magnetic toner d0 supplied from the port 11b is mixed with stirring. Auger roll 14a
With the rotation of, the magnetic toner d'returned and returned and the replenishing magnetic toner d0 are circulated and conveyed while being mixed and stirred. In FIG. 3, the magnetic toner that is circulated and conveyed in the direction of the broken line arrow D is conveyed again in the vertical direction by the rotating magnetic field of the magnet roll 16 that extends above when it is conveyed through the longitudinal path 13b on the side opposite to the supply side. It
【0033】以上の様に、記録部Wを経て下流側に搬送
された磁性トナーd′が水平循環経路13上へ掻き落と
され、この水平循環経路13を通じて撹拌されつつ円滑
に上流側に返送され、再度トナー記録画像の形成に供さ
れる。磁性トナーdが水平循環経路13を撹拌されつつ
循環搬送される際に、所定の極性に充分に摩擦帯電す
る。As described above, the magnetic toner d'conveyed to the downstream side through the recording section W is scraped off on the horizontal circulation path 13 and smoothly returned to the upstream side while being stirred through the horizontal circulation path 13. Then, the toner recording image is formed again. When the magnetic toner d is circulated and conveyed while being stirred in the horizontal circulation path 13, it is sufficiently triboelectrified to a predetermined polarity.
【0034】尚、この発明は、上記の特定の実施例に限
定されるべきものでなく、本発明の技術的範囲において
種々の変形が可能であることは勿論である。例えば、上
記実施例では現像剤として負(−)帯電性の磁性トナー
を用いたが、正(+)帯電性の磁性トナーを用いること
も可能である。その場合、記録電極及び対向電極へ印加
するバイアス電圧を正(+)極性とすればよい。It should be noted that the present invention should not be limited to the above-mentioned specific embodiments, and it goes without saying that various modifications can be made within the technical scope of the present invention. For example, although the negative (−) chargeable magnetic toner is used as the developer in the above embodiment, it is also possible to use the positive (+) chargeable magnetic toner. In that case, the bias voltage applied to the recording electrode and the counter electrode may have a positive (+) polarity.
【0035】[0035]
【発明の効果】以上、詳細に説明した様に、この発明に
よれば、対向電極表面と現像剤担持部材が最近接する位
置より現像剤搬送方向上流側へ微小距離だけずらせた位
置に記録電極の先端を位置させ、この記録電極の先端対
応位置に下流側に向って落ちる段差を形成し、この段差
の大きさを前記現像剤が形成する穂の高さより大きく設
定することにより、画素をシャープに形成できると共に
形成したトナー記録画像を回収現像剤で乱す不都合を確
実に防止することができる。これにより、画像の乱れが
なくシャープな画素からなる高解像度の記録画像を、長
期に亘って安定して形成することが可能となる。As described above in detail, according to the present invention, the recording electrode is located at a position displaced by a minute distance from the position where the counter electrode surface and the developer carrying member are closest to each other to the upstream side in the developer transport direction. The tip is positioned, a step is formed at the position corresponding to the tip of the recording electrode, which drops toward the downstream side, and the size of the step is set to be larger than the height of the spike formed by the developer, thereby sharpening the pixel. It is possible to reliably prevent the inconvenience that the formed toner recording image is disturbed by the collected developer. As a result, it is possible to stably form a high-resolution recorded image having sharp pixels without image distortion for a long period of time.
【図1】本発明の一方の要点の一実施例としての静電記
録装置の全体構成を示す模式的断面図である。FIG. 1 is a schematic cross-sectional view showing the overall configuration of an electrostatic recording device as an embodiment of one of the main points of the present invention.
【図2】上記静電記録装置における記録画像形成ユニッ
トとその周辺構成を示す模式的断面図である。FIG. 2 is a schematic cross-sectional view showing a recording image forming unit and its peripheral configuration in the electrostatic recording apparatus.
【図3】上記記録画像形成ユニットの水平循環経路を示
す平断面図である。FIG. 3 is a plan sectional view showing a horizontal circulation path of the recording image forming unit.
【図4】上記静電記録装置における記録部とその近傍の
構成を示す模式的断面図である。FIG. 4 is a schematic cross-sectional view showing a configuration of a recording unit and its vicinity in the electrostatic recording device.
【図5】上記記録部における現像剤の穂の形成メカニズ
ムを示す説明図である。FIG. 5 is an explanatory diagram showing a mechanism of formation of developer ears in the recording unit.
【図6】上記記録画像形成ユニット全体を示す斜視図で
ある。FIG. 6 is a perspective view showing the entire recorded image forming unit.
【図7】上記記録部におけるドット形成動作を段階的に
示す動作説明図である。FIG. 7 is an operation explanatory diagram showing stepwise a dot forming operation in the recording unit.
【図8】記録信号電圧とバイアス電圧の関係を示すタイ
ミングチャート図である。FIG. 8 is a timing chart showing a relationship between a recording signal voltage and a bias voltage.
5 円筒電極 5a バイアス電源(円筒電極側) 11 現像剤貯留槽 12 現像記録槽 13 水平循環経路 14a,14b オーガロール 15 現像スリーブ 16 マグネットロール 17 記録電極シート 17a 記録電極線 18 駆動回路素子 EL 記録電極 G 段差 S 中央空間 U 記録画像形成ユニット W 記録部 5 Cylindrical electrode 5a Bias power supply (cylindrical electrode side) 11 Developer storage tank 12 Development recording tank 13 Horizontal circulation path 14a, 14b Auger roll 15 Developing sleeve 16 Magnet roll 17 Recording electrode sheet 17a Recording electrode wire 18 Driving circuit element EL recording electrode G step S central space U recording image forming unit W recording unit
Claims (1)
部材と、該現像剤担持部材の表面に沿って現像剤を搬送
する現像剤搬送手段と、前記現像剤担持部材の表面に間
隔を保って並設した記録電極と、該記録電極に対向配置
した対向電極とを有し、各前記記録電極に記録情報に応
じて電圧を印加し、搬送されてきた現像剤を前記対向電
極側へ選択的に転移させる静電記録装置において、 前記記録電極の先端を前記現像剤担持部材と前記対向電
極表面が最近接する位置より現像剤搬送方向上流側へ微
小距離だけずらせて位置させ、前記現像剤担持部材の前
記記録電極の先端対応位置に下流側に向って落ちる段差
を形成すると共に該段差の大きさを前記現像剤が形成す
る穂の高さより大きく設定したことを特徴とする静電記
録装置。1. A developer carrying member laid along a predetermined path, a developer carrying means for carrying a developer along the surface of the developer carrying member, and a gap on the surface of the developer carrying member. It has a recording electrode arranged in parallel while keeping it, and a counter electrode arranged so as to face the recording electrode. A voltage is applied to each of the recording electrodes according to recording information, and the conveyed developer is transferred to the counter electrode side. In the electrostatic recording device for selectively transferring, the tip of the recording electrode is displaced by a minute distance to the upstream side in the developer transport direction from the position where the developer carrying member and the surface of the counter electrode are closest to each other, and the developer is An electrostatic recording apparatus characterized in that a step is formed at a position corresponding to the tip of the recording electrode of the carrier member, the step falling toward the downstream side, and the size of the step is set to be larger than the height of the brush formed by the developer. ..
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20022191A JPH0542711A (en) | 1991-08-09 | 1991-08-09 | Electrostatic recording device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20022191A JPH0542711A (en) | 1991-08-09 | 1991-08-09 | Electrostatic recording device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0542711A true JPH0542711A (en) | 1993-02-23 |
Family
ID=16420825
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20022191A Pending JPH0542711A (en) | 1991-08-09 | 1991-08-09 | Electrostatic recording device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0542711A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8079216B2 (en) | 2006-05-31 | 2011-12-20 | Toyota Jidosha Kabushiki Kaisha | Actuator for automobiles |
-
1991
- 1991-08-09 JP JP20022191A patent/JPH0542711A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8079216B2 (en) | 2006-05-31 | 2011-12-20 | Toyota Jidosha Kabushiki Kaisha | Actuator for automobiles |
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