JPS644170B2 - - Google Patents
Info
- Publication number
- JPS644170B2 JPS644170B2 JP55038230A JP3823080A JPS644170B2 JP S644170 B2 JPS644170 B2 JP S644170B2 JP 55038230 A JP55038230 A JP 55038230A JP 3823080 A JP3823080 A JP 3823080A JP S644170 B2 JPS644170 B2 JP S644170B2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- image
- speed
- development
- developing
- 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
Links
- 238000000034 method Methods 0.000 claims description 34
- 238000011161 development Methods 0.000 claims description 15
- 230000005684 electric field Effects 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- CJPQIRJHIZUAQP-MRXNPFEDSA-N benalaxyl-M Chemical compound CC=1C=CC=C(C)C=1N([C@H](C)C(=O)OC)C(=O)CC1=CC=CC=C1 CJPQIRJHIZUAQP-MRXNPFEDSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- RAPZEAPATHNIPO-UHFFFAOYSA-N risperidone Chemical compound FC1=CC=C2C(C3CCN(CC3)CCC=3C(=O)N4CCCCC4=NC=3C)=NOC2=C1 RAPZEAPATHNIPO-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0907—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush with bias voltage
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
- Developing For Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は電子写真現像方法に係り、詳しくは静
電潜像保持体の周速が変化する場合にそれに応じ
て現像条件を変えることにより常に安定した画像
を与え得る電子写真現像方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic developing method, and more particularly, the present invention relates to an electrophotographic developing method, and more specifically, when the peripheral speed of an electrostatic latent image holder changes, the developing conditions are changed accordingly, so that a stable image can always be obtained. It relates to a photographic developing method.
一成分現像剤を利用する現像方式としては各種
の方法・装置が知られ、或いは提案されている。
その中でもジヤンピング現像法が特異な存在とし
て知られている。この方法は現像剤保持手段上に
一成分現像剤を均一に薄層として塗布した後この
現像剤薄層とは小間隙を保つて静電潜像面を対向
させた構成となす。そしてその静電引力により現
像剤を現像剤保持手段から静電潜像に飛翔させて
現像する方法である（特公昭41−9475号公報、米
国特許第2839400号明細書参照）。 Various methods and apparatuses are known or proposed as developing systems using one-component developer.
Among them, the jumping development method is known as unique. In this method, a one-component developer is uniformly applied as a thin layer onto a developer holding means, and then the electrostatic latent image surface is opposed to the thin developer layer with a small gap being maintained. This is a method of developing the image by causing the developer to fly from the developer holding means to the electrostatic latent image using the electrostatic attraction (see Japanese Patent Publication No. 41-9475 and US Pat. No. 2,839,400).
この方法によると潜像電位のない非画像部では
現像剤が引き付けられないばかりか現像剤が非画
像部に接触しないのでカプリの全くない良好な現
像が行なわれる。更にキヤリヤ粒子を用いないの
で現像剤の混合比に変動がなくキヤリヤ粒子の劣
化もない等良好な効果が得られる。 According to this method, not only is the developer not attracted to the non-image area where there is no latent image potential, but also the developer does not come into contact with the non-image area, so that good development is carried out without any capri. Furthermore, since no carrier particles are used, good effects such as no fluctuation in the developer mixing ratio and no deterioration of the carrier particles can be obtained.
しかし乍らこの現像方法はトナーが担持体より
潜像保持体へ転移するための電位閾値が存在し、
潜像電位がこの閾値以上のときにはすべてのトナ
ーが転移し、これ以下のときには全く転移できな
い。従つて、階調性の極めて乏しい画調となる。
さらに、画像端部より発する電気力線がトナー層
まで達し得ないためラインの細つた画像となつて
しまう。 However, in this developing method, there is a potential threshold for the toner to transfer from the carrier to the latent image carrier.
When the latent image potential is above this threshold, all toner is transferred, and when it is below this, no toner is transferred. Therefore, the resulting image has extremely poor gradation.
Furthermore, the lines of electric force emitted from the edges of the image cannot reach the toner layer, resulting in an image with narrow lines.
これらの問題点を解決するため本出願人は先に
特開昭55−18656号、同55−18659号公報に記載し
たようにこのジヤンピング現像法に関し全く新し
い現像法を提案した。 In order to solve these problems, the present applicant has proposed a completely new developing method with respect to the jumping developing method, as previously described in Japanese Patent Application Laid-Open Nos. 55-18656 and 55-18659.
即ち、その現像法は一成分電気絶縁性磁性現像
剤と、現像剤保持手段（非磁性）と、磁界発生手
段とをこの順で配置し磁界発生手段による磁力に
より現像剤保持手段上に均一な現像剤薄層を形成
し、この現像剤薄層表層が静電潜像形成面に接触
しないように微小間隙を離して対向させた構成と
なす。そしてこれに現像バイアス電圧として交流
バイアス電圧を印加し、更には静電潜像面と現像
剤保持手段との間隙を経時的に変化させることに
より現像を行うものである。この現像法により現
像の初期においては静電潜像の非潜像の非画像部
にも現像剤を到達させることによりハーフトーン
部の現像を行い経時的には画像部のみに到達する
ようにして現像を行う。 That is, the development method involves arranging a one-component electrically insulating magnetic developer, a developer holding means (non-magnetic), and a magnetic field generating means in this order, and using the magnetic force of the magnetic field generating means to uniformly spread the developer onto the developer holding means. A thin developer layer is formed, and the surface layer of the developer thin layer faces the electrostatic latent image forming surface with a small gap therebetween so as not to contact the surface layer. Then, an alternating current bias voltage is applied as a developing bias voltage to this, and the gap between the electrostatic latent image surface and the developer holding means is changed over time to perform development. With this development method, in the early stage of development, the developer reaches the non-image areas of the electrostatic latent image, thereby developing the halftone area, and over time, the developer reaches only the image area. Perform development.
これにより従来の現像法に比較してハーフトー
ンの再現性の良い、しかもライン再現性に優れ、
カプリのない現像が行なわれる効果が得られる。 This results in better halftone reproducibility than conventional development methods, as well as excellent line reproducibility.
The effect of capri-free development can be obtained.
又、このように一成分現像剤の薄層を潜像面に
対向配置して交番電界を作用させつつ現像する現
像方法によれば従来法に比して現像性能、画像再
現性、現像剤の寿命、等において極めて秀れた効
果が得られる。 In addition, the development method in which a thin layer of one-component developer is placed opposite to the latent image surface and developed while applying an alternating electric field improves development performance, image reproducibility, and developer efficiency compared to conventional methods. Extremely excellent effects can be obtained in terms of lifespan, etc.
このように上記の先の提案方法は優れたもので
あるが、ただこの方法による現像特性はプロセス
スピードに依存するのでプロセススピードが変化
する、例えばフアクシミリにおける複写装置の如
きものに適用して常に一定にした画質を得るには
多少問題がある。 In this way, the previously proposed method is excellent, but since the development characteristics of this method depend on the process speed, it is difficult to apply it to a device where the process speed changes, such as a copying machine in a facsimile machine, so that it is always constant. There are some problems in obtaining the desired image quality.
そこで本発明は上記方法につき更に改良して静
電潜像保持体の周速が変化する即ちプロセススピ
ードが変化する場であつても該現像法により常に
安定した画像を得ることができるようにすること
を目的とするもので、静電像保持体と、現像剤担
持体の間隙に交互電界を印加する電子写真現像方
法において、静電像保持体の移動速度の変化に応
じて交互電界の周波数を、該移動速度を遅くした
場合は小さく、速くした場合は大きくするように
変化せしめることを特徴とする電子写真現像方法
を要旨とする。 Therefore, the present invention further improves the above method so that even when the peripheral speed of the electrostatic latent image carrier changes, that is, the process speed changes, it is possible to always obtain a stable image by this developing method. In an electrophotographic development method in which an alternating electric field is applied between an electrostatic image holder and a developer carrier, the frequency of the alternating electric field is adjusted according to changes in the moving speed of the electrostatic image holder. The gist of the present invention is an electrophotographic developing method characterized in that the moving speed is changed such that it becomes smaller when the moving speed is slowed and becomes larger when the moving speed is faster.
尚この場合、画像に方向性が現れるのを防ぐた
め潜像保持体と、トナー担持体は常に同方向に略
周速（プロセススピード）で移動する必要があ
る。 In this case, in order to prevent the appearance of directionality in the image, the latent image holding member and the toner carrying member must always move in the same direction at approximately circumferential speed (process speed).
この際条件として最も重要なことは特開昭55−
18657号公報に述べた如く、画像にムラが生じな
いための条件0.3Vp＜ｆ（Vp：プロセススピード、
ｆ：周波数）が守られなければならない。さらに
実験によればプロセススピードを遅くした場合に
は周波数を小さく、速くした場合には周波数を大
きくすることにより同一現像条件が得られ、この
ことは理論的に求められるVpfで、同一現像条
件が得られるという考え方におよそ一致してい
る。 In this case, the most important condition is
As stated in Publication No. 18657, the condition for preventing unevenness in the image is 0.3V p < f (V p : process speed,
f: frequency) must be observed. Furthermore, experiments have shown that the same development conditions can be obtained by decreasing the frequency when the process speed is slowed down, and by increasing the frequency when increasing the process speed. This roughly agrees with the idea that the conditions can be obtained.
実施例
図面は本発明法方を具現した現像器の一例を示
すもので、
１は潜像保持体たる絶縁層を有するドラムであ
つて、図示されていない部位で多針電極により正
の静電荷像を形成されている。２は永久磁石３を
内包する非磁性スリーブであつて両部材１と２は
等速で同一方向に回転する。５は絶縁性の磁性ト
ナーであつて、その成分はスチレン樹脂60重量
％、マグネタイト35重量％、カーボンブラツク３
重量％、負性荷電制御剤スピロン２重量％からな
る。又流動性向上のため0.1重量％のコロイダル
シリカが外添されている。トナーは現像剤担持体
たる非磁性スリーブ２によつて搬送されるが、ス
リーブに近接した磁性ブレード６により塗布厚を
約70μに規制される。又トナー５はスリーブ２と
の摩擦帯電によつて負電荷を付与される。部材７
はトナー容器である。部材１と２は最小間隙
300μに保持されている。部材２と部材６とはそ
の間での放電を防防ぐため電気的に導通状態に保
たれ、電源９によりドラム１の接地された背面電
極１０、とスリーブ２間に交番電圧が印加されて
いる。１１はドラム１の周速に比例して、周波数
を変えるための制御装置である。Embodiment The drawing shows an example of a developing device embodying the method of the present invention, in which 1 is a drum having an insulating layer serving as a latent image holder, and a positive electrostatic charge is applied to a portion (not shown) by a multi-needle electrode. An image is being formed. 2 is a non-magnetic sleeve containing a permanent magnet 3, and both members 1 and 2 rotate at the same speed and in the same direction. 5 is an insulating magnetic toner whose components are 60% by weight of styrene resin, 35% by weight of magnetite, and carbon black 3.
% by weight, and 2% by weight of the negative charge control agent spiron. Additionally, 0.1% by weight of colloidal silica is externally added to improve fluidity. The toner is conveyed by a non-magnetic sleeve 2 serving as a developer carrier, and the coating thickness is regulated to about 70 microns by a magnetic blade 6 close to the sleeve. Further, the toner 5 is given a negative charge by frictional charging with the sleeve 2. Part 7
is a toner container. Parts 1 and 2 have the minimum gap
It is held at 300μ. The members 2 and 6 are maintained in electrical continuity to prevent discharge between them, and an alternating voltage is applied between the grounded back electrode 10 of the drum 1 and the sleeve 2 by a power source 9. Reference numeral 11 denotes a control device for changing the frequency in proportion to the circumferential speed of the drum 1.
本実施例においては交番電圧の振幅は1500Vpp
であつて、直流電圧＋250Vが重畳されている。
そして、その周波数は制御装置１１により、ｆ＝
３×Vp、ｆ≡Hz、Vp≡プロセススピード（mm／
sec）となるように設定されている。 In this example, the amplitude of the alternating voltage is 1500V pp
, and a DC voltage of +250V is superimposed.
Then, the frequency is determined by the control device 11 as f=
3×V p , f≡Hz, V p ≡ process speed (mm/
sec).
上記の構成によりドラム１の周速つまりプロセ
ススピードを変化させ、それに対応して部材１，
２間の交番電圧を変化させて現像を行なつたとこ
ろ画像を常に一定に保持させることができた。 With the above configuration, the circumferential speed of the drum 1, that is, the process speed is changed, and the member 1,
When developing was carried out by changing the alternating voltage between the two, the image could always be kept constant.
図は本発明方法を具現した現像装置の一例の断
面図である。
１は潜像保持体（ドラム）、２は現像剤担持体、
５はトナー。
The figure is a sectional view of an example of a developing device embodying the method of the present invention. 1 is a latent image holding member (drum), 2 is a developer carrying member,
5 is toner.
Claims (1)
電界を印加する電子写真現像方法において、静電
像保持体の移動速度の変化に応じて交互電界の周
波数を、該移動速度を遅くした場合は小さく、速
くした場合は大きくするように変化せしめること
を特徴とする電子写真現像方法。1. In an electrophotographic development method in which an alternating electric field is applied to the gap between an electrostatic image holder and a developer carrier, the frequency of the alternating electric field is changed according to a change in the moving speed of the electrostatic image holder, and the moving speed is slowed down. An electrophotographic developing method characterized in that the change is made smaller when the speed is increased, and becomes larger when the speed is increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3823080A JPS56135849A (en) | 1980-03-27 | 1980-03-27 | Electrophotographic developing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3823080A JPS56135849A (en) | 1980-03-27 | 1980-03-27 | Electrophotographic developing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56135849A JPS56135849A (en) | 1981-10-23 |
| JPS644170B2 true JPS644170B2 (en) | 1989-01-24 |
Family
ID=12519497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3823080A Granted JPS56135849A (en) | 1980-03-27 | 1980-03-27 | Electrophotographic developing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56135849A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60131555A (en) * | 1983-12-20 | 1985-07-13 | Konishiroku Photo Ind Co Ltd | Developing method |
| JP4508678B2 (en) | 2004-02-19 | 2010-07-21 | キヤノン株式会社 | Image forming apparatus |
-
1980
- 1980-03-27 JP JP3823080A patent/JPS56135849A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56135849A (en) | 1981-10-23 |
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