JPS62170975A - Method for developing electrostatic image - Google Patents
Method for developing electrostatic imageInfo
- Publication number
- JPS62170975A JPS62170975A JP1325886A JP1325886A JPS62170975A JP S62170975 A JPS62170975 A JP S62170975A JP 1325886 A JP1325886 A JP 1325886A JP 1325886 A JP1325886 A JP 1325886A JP S62170975 A JPS62170975 A JP S62170975A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- sleeves
- image
- toner
- magnet rolls
- 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
- 238000000034 method Methods 0.000 title claims description 22
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 abstract description 3
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 3
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 2
- 239000000696 magnetic material Substances 0.000 abstract description 2
- 108091008695 photoreceptors Proteins 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910002012 Aerosil® Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011156 evaluation 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
- 239000006247 magnetic powder Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920005792 styrene-acrylic resin Polymers 0.000 description 1
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は画像担体表面に形成した静電荷像を現像する方
法に関するものであり、特に磁性キャリアと磁性トナー
とからなる現像剤を使用して、磁気ブラシ法によって現
像する方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for developing an electrostatic charge image formed on the surface of an image carrier, and particularly to a method for developing an electrostatic image formed on the surface of an image carrier, and in particular, a method for developing an electrostatic charge image formed on the surface of an image carrier, and in particular a method using a developer comprising a magnetic carrier and a magnetic toner. , relates to a method of developing using a magnetic brush method.
（従来の技術〕
画像担体表面に形成した静電荷像を現像する場合には、
一般に磁気ブラシ法が使用されている。(Prior art) When developing an electrostatic charge image formed on the surface of an image carrier,
A magnetic brush method is generally used.
而して磁気ブラシ現像に使用される現像剤としては、磁
性キャリアと非磁性トナーとを混合した二成分系現像剤
が多い。一方現像剤として樹脂と磁性粉による一成分系
現像剤を使用する方法もある。The developer used in magnetic brush development is often a two-component developer in which a magnetic carrier and a non-magnetic toner are mixed. On the other hand, there is also a method of using a one-component developer consisting of resin and magnetic powder as the developer.
前者の二成分系現像剤を使用する方法においては。In the former method using a two-component developer.
画像濃度および解像度の良好な画像が得られる反面、中
間調の再現性が劣るという問題点かある。Although images with good image density and resolution can be obtained, there is a problem in that the reproducibility of halftones is poor.
一方後者の一成分系現像剤を使用する方法においては、
トナー帯電量の増加に伴うトナーの帯電凝集現像の惹起
、スリーブ上のトナー不足による現像不足等の問題点が
ある。これらの問題点を解決する手段として２例えば特
開昭５９−１６２５６３号および同５９−２１６１４９
号公報に記載のような磁性キャリアと磁性トナーとを混
合した現像剤が提案されており、前記従来の二成分系現
像剤および−成分系現像剤の両者の長所を併有するもの
とされている。On the other hand, in the latter method using a one-component developer,
There are problems such as the occurrence of toner charge aggregation development due to an increase in the amount of toner charge, and insufficient development due to insufficient toner on the sleeve. As a means to solve these problems, 2 examples include Japanese Patent Application Laid-open Nos. 59-162563 and 59-216149.
A developer in which a magnetic carrier and a magnetic toner are mixed as described in the above publication has been proposed, and is said to have the advantages of both the conventional two-component developer and the conventional two-component developer. .
近年複写機の多様化および小型化に伴って、現像装置自
体にも小型化の要請が強くなり、構成要素である感光体
を初め、永久磁石ロールおよびスリーブの直径も次第に
小さくなっている。この結果磁気ブラシが感光体と接触
する円周方向の長さすなわち現像幅が減少し１両者の接
触時間が短くなる。従ってこのまま現像を行うと３画質
の低下。In recent years, with the diversification and miniaturization of copying machines, there has been a strong demand for miniaturization of the developing device itself, and the diameters of its constituent elements, such as the photoreceptor, permanent magnet roll, and sleeve, are gradually becoming smaller. As a result, the circumferential length of the magnetic brush in contact with the photoreceptor, that is, the development width, is reduced, and the contact time between the two is shortened. Therefore, if you continue developing as is, the image quality will deteriorate.
すなわち画像濃度および解像度が低下するという問題点
がある。That is, there is a problem that image density and resolution are reduced.
本発明は上記のような従来の現像方法に存する問題点を
解消し、小型の現像装置を使用しても。The present invention solves the problems of the conventional developing method as described above, and even uses a small-sized developing device.
画像濃度および解像度を充分に確保できる現像方法を提
供することを目的とするものである。The object of the present invention is to provide a developing method that can ensure sufficient image density and resolution.
上記問題点解決のために９本発明においては下記のよう
な技術的手段を採用した。すなわち２画像担体表面に形
成した静電潜像を、磁性キャリアと磁性トナーとを混合
してなる現像剤を使用して磁気ブラシ法によって現像す
る静電荷像現像方法において、前記静電潜像に複数個の
磁気ブラシを摺擦させて現像するという技術的手段を講
じたものである。In order to solve the above problems, the following technical means were adopted in the present invention. That is, in an electrostatic image developing method in which an electrostatic latent image formed on the surface of an image carrier is developed by a magnetic brush method using a developer made of a mixture of a magnetic carrier and a magnetic toner, the electrostatic latent image is This technique uses a technical means of developing by rubbing a plurality of magnetic brushes against each other.
図は本発明の実施例における装置を示す要部断面図であ
る。図において１はトナ一槽であり、磁性トナー２を収
容する。トナ一槽１の低部には表、面にＮＳ磁極を有す
る永久磁石ロール３ａ、３ｂを設けると共に、それらと
同軸的にスリーブ４ａ。The figure is a sectional view of a main part showing an apparatus in an embodiment of the present invention. In the figure, reference numeral 1 denotes a toner tank, which stores magnetic toner 2 . At the bottom of the toner tank 1, permanent magnet rolls 3a and 3b having NS magnetic poles on the front and surface are provided, and a sleeve 4a is provided coaxially therewith.
４ｂを回転自在に設ける。スリーブ４ａ、４ｂは例えば
アルミニウム合金若しくはステンレス鋼等の非磁性材料
により、中空円筒状に形成する。次に５は感光体であり
１回転自在に形成すると共に。4b is rotatably provided. The sleeves 4a and 4b are made of a non-magnetic material such as aluminum alloy or stainless steel and are formed into a hollow cylindrical shape. Next, 5 is a photoreceptor, which is formed so as to be able to rotate freely once.
前記永久磁石ロール３ａ、３ｂ表面の各々何れかの磁極
と対向するように配設し、前記スリーブ４ａ、４ｂと現
像ギャップＤを形成する。６ａ、６ｂは各々ドクターブ
レードであり、スリーブ４ ａ ＋４ｂの表面に近接さ
せて配設し、ドクターギャップｄを形成する。The permanent magnet rolls 3a and 3b are arranged so as to face one of the magnetic poles on the surface thereof, and a developing gap D is formed with the sleeves 4a and 4b. Reference numerals 6a and 6b each represent a doctor blade, which is disposed close to the surface of the sleeve 4a+4b to form a doctor gap d.
以上の構成により、永久磁石ロール３ａ、３ｂを各々固
定して、スリーブ４ａ、４ｂを各々矢印方向に回転させ
ると、トナ一槽１内に収容されたトナー２は、ドクター
ギャップｄを経てスリーブ４ａ、４ｂによって搬送され
、前記永久磁石ロール３ａ、３ｂ表面の磁極による磁気
ブラシを形成して、感光体５の表面を摺擦する。この場
合永久磁石ロール３ａ、３ｂが独立であるため、感光体
表面を摺擦する磁気ブラシ（図示せず）もまた独立に２
個形成される。従って感光体５の表面に形成した静電荷
像を、上記２個の磁気ブラシによって確実に現像するの
である。なおスリーブ４ａ。With the above configuration, when the permanent magnet rolls 3a and 3b are each fixed and the sleeves 4a and 4b are rotated in the directions of the arrows, the toner 2 contained in the toner tank 1 passes through the doctor gap d to the sleeve 4a. , 4b, and the magnetic brush formed by the magnetic poles on the surfaces of the permanent magnet rolls 3a and 3b rubs the surface of the photoreceptor 5. In this case, since the permanent magnet rolls 3a and 3b are independent, the magnetic brush (not shown) that rubs the surface of the photoreceptor is also independent.
Formed individually. Therefore, the electrostatic charge image formed on the surface of the photoreceptor 5 is reliably developed by the two magnetic brushes. Note that the sleeve 4a.
４ｂは相互に近接して配設するが９回転方向を各々逆方
向にしであるため、近接部分では外周の移動方向が同一
となり、トナー２の移動に支障を来すことはない。この
場合スリーブ４ａ、４ｂの外径寸法は大略１６〜２０＋
ｍであり、スリーブ上の磁束密度は６００〜８００Ｇで
ある。4b are disposed close to each other, but the nine rotation directions are opposite to each other, so that the outer periphery moves in the same direction in the adjacent portions, and the movement of the toner 2 is not hindered. In this case, the outer diameter of the sleeves 4a and 4b is approximately 16 to 20+
m, and the magnetic flux density on the sleeve is 600-800G.
次に画像表に使用した磁性キャリアおよび磁性トナーに
ついて記述する。Next, the magnetic carrier and magnetic toner used in the image table will be described.
フェライトキャリア ６０重量％（日立金
属製 Ｋ Ｂ Ｎ −１００）磁性トナー
４０重量％磁性トナーは下記の配合比および
工程によった。Ferrite carrier 60% by weight (Hitachi Metals KBN-100) Magnetic toner
The 40% by weight magnetic toner was prepared using the following compounding ratio and process.
スチレンアクリル樹脂 ４８部゛ （セキス
イ化学工業製 Ｐ ５２０）マグネタイト
５０部（戸田工業型 Ｅ Ｐ Ｔ５００）
電荷制御剤 ２部（オリエント化
学製 ボントロンＥ８１）上記混合物を２００℃で混練
、冷却固化後、粉砕処理し、シリカ（日本アエロジル製
Ｒ９７２）を０．５部添加して１２０℃で熱処理１分
級等の処理により平均粒径５〜２０μｍ１体積固有抵抗
５×１０１４Ω・ｃｍの磁性トナーとした。Styrene acrylic resin 48 parts (Sekisui Kagaku Kogyo P520) Magnetite
50 copies (Toda Kogyo type E P T500)
Charge control agent 2 parts (Bontron E81 manufactured by Orient Chemical Co., Ltd.) The above mixture was kneaded at 200°C, solidified by cooling, pulverized, 0.5 part of silica (R972 manufactured by Nippon Aerosil) was added, and heat treated at 120°C for 1 classification, etc. By this treatment, a magnetic toner having an average particle size of 5 to 20 μm and a volume resistivity of 5×10 14 Ω·cm was obtained.
以上のようにして作成した磁性トナーおよび前記フェラ
イトキャリアを混合してなる現像剤を使用して画像評価
を行った。まず感光体ドラム５として直径６０ｗ＋＊の
セレンドラム（周速１５０ｆｌ／秒）を使用し、 ＋
７２０Ｖで一様帯電後１表面に静電潜像を形成した。Image evaluation was performed using a developer prepared by mixing the magnetic toner prepared as described above and the ferrite carrier. First, a selenium drum (peripheral speed 150 fl/sec) with a diameter of 60 W+* is used as the photoreceptor drum 5.
After uniform charging at 720 V, an electrostatic latent image was formed on one surface.
現像装置には、外径１６ｍ、８極着磁１表面磁束密度６
００ Ｇの永久磁石ロール３ａ。The developing device has an outer diameter of 16 m, 8 pole magnetization, 1 surface magnetic flux density, and
00 G permanent magnet roll 3a.
３ｂおよび外径２０ｍｍのステンレス製スリーブ４ａ。3b and a stainless steel sleeve 4a with an outer diameter of 20 mm.
４ｂを使用した。4b was used.
なおスリーブ４ａ、４ｂの回転数２０Ｏｒｐｍ、 ］）
＝Ｑ、５ ｗ、 ｄ ＝０．３ ｍとした。これら
の結果を表に示す。Note that the rotation speed of sleeves 4a and 4b is 20 Orpm, ])
= Q, 5 w, d = 0.3 m. These results are shown in the table.
以下余白。Margin below.
表から明らかなように、永久磁石ロールおよびスリーブ
からなる現像ロールが１本である従来方法によるもので
は、現像速度１００＋ｎ／秒において濃度は１．０を示
すものの、解像度は６本／１に留まり、現像速度の上昇
に従って濃度および解像度が大幅に低下することを示し
ている。これに対して本発明方法における現像ロール２
本の場合には。As is clear from the table, in the conventional method using one developing roll consisting of a permanent magnet roll and a sleeve, the density shows 1.0 at a developing speed of 100+n/sec, but the resolution remains at 6/1. , showing that density and resolution decrease significantly as development speed increases. In contrast, the developing roll 2 in the method of the present invention
In the case of books.
濃度および解像度共に高い値を示すのみならず。It not only shows high values for both density and resolution.
現像速度が増大しても濃度が僅かに減少する傾向が見ら
れるものの、解像度は８本／龍を維持し。Although there is a tendency for the density to slightly decrease as the development speed increases, the resolution remains at 8 lines/dragon.
高品質の画像であることを示している。これは現像ロー
ルにおける磁気ブラシ現像幅が倍加されることに起因す
る結果である。This indicates a high quality image. This is a result of the magnetic brush development width on the developing roll being doubled.
本実施例においては、永久磁石ロールおよびスリーブ各
々２本使用した例を示したが、これらを各々３本使用し
た場合も、前記表と同一の結果を得ており、更に多数本
を使用することもできる。In this example, an example was shown in which two permanent magnet rolls and two sleeves were used, but even when three of each were used, the same results as in the table above were obtained, and it is possible to use a larger number of them. You can also do it.
また使用する複数本の永久磁石ロールおよびスリーブは
、夫々同一直径寸法の他に異なる寸法のものも使用でき
る。更に磁性キャリアとしては、フェライトキャリアの
みに限らず、鉄粉若しくは酸化鉄等の他の磁性キャリア
でも作用は同一である。Further, the plurality of permanent magnet rolls and sleeves used may have the same diameter or may have different diameters. Furthermore, the magnetic carrier is not limited to ferrite carriers, but other magnetic carriers such as iron powder or iron oxide can have the same effect.
本発明は以上記述のような構成および作用であるから、
下記の効果を奏することができる。Since the present invention has the structure and operation as described above,
The following effects can be achieved.
（１）感光体ドラムが４０〜１００酊φのような小直径
であり、かつ永久磁石ロール１６ｍ−２５鶴のような小
直径の小型の場合でも、現像幅を充分に確保できるから
、濃度および解像度共に大である高品質の画像を得るこ
とができる。(1) Even if the photoreceptor drum has a small diameter such as 40 to 100 φ and the permanent magnet roll is small with a small diameter such as 16 m to 25 m, a sufficient development width can be secured, so the density and High-quality images with high resolution can be obtained.
（２）現像用のロールおよびスリーブが独立に複数本あ
るため、現像速度を上昇させることができる。(2) Since there are a plurality of independent developing rolls and sleeves, the developing speed can be increased.
（３）上記（１１（２）と関連して、小型の装置で現像
複写を行うことができるため、事務スペースを節減する
ことができる。(3) In relation to (11(2)) above, since development and copying can be performed using a small device, office space can be saved.
図は本発明の実施例における装置を示す要部断面図であ
る。
３ａ、３ｂ：永久磁石ロール、４ａ、４ｂニスリーブ。The figure is a sectional view of a main part showing an apparatus in an embodiment of the present invention. 3a, 3b: permanent magnet roll, 4a, 4b sleeve.
Claims (2)
アと磁性トナーとを混合してなる現像剤を使用して磁気
ブラシ法によって現像する静電荷像現像方法において、
前記静電潜像に複数個の磁気ブラシを摺擦させて現像す
ることを特徴とする静電荷像現像方法。(1) In an electrostatic image developing method in which an electrostatic latent image formed on the surface of an image carrier is developed by a magnetic brush method using a developer made of a mixture of a magnetic carrier and a magnetic toner,
An electrostatic latent image developing method characterized in that the electrostatic latent image is developed by rubbing a plurality of magnetic brushes against the electrostatic latent image.
求の範囲第１項記載の静電荷像現像方法。(2) The electrostatic image developing method according to claim 1, wherein the magnetic carrier is a ferrite carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1325886A JPS62170975A (en) | 1986-01-24 | 1986-01-24 | Method for developing electrostatic image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1325886A JPS62170975A (en) | 1986-01-24 | 1986-01-24 | Method for developing electrostatic image |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62170975A true JPS62170975A (en) | 1987-07-28 |
Family
ID=11828192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1325886A Pending JPS62170975A (en) | 1986-01-24 | 1986-01-24 | Method for developing electrostatic image |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62170975A (en) |
-
1986
- 1986-01-24 JP JP1325886A patent/JPS62170975A/en active Pending
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