JPS6363070A - Developing method for electrostatic charge image - Google Patents
Developing method for electrostatic charge imageInfo
- Publication number
- JPS6363070A JPS6363070A JP20864186A JP20864186A JPS6363070A JP S6363070 A JPS6363070 A JP S6363070A JP 20864186 A JP20864186 A JP 20864186A JP 20864186 A JP20864186 A JP 20864186A JP S6363070 A JPS6363070 A JP S6363070A
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- image
- magnetic
- carrier
- permanent magnet
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 22
- 238000011161 development Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002156 mixing Methods 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
- 238000011156 evaluation Methods 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
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 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
- 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
- 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
- 230000003068 static effect Effects 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
像する方法の改良に関する。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for developing an electrostatic image formed on the surface of an image carrier, and particularly to a method using a developer consisting of a magnetic carrier and a magnetic toner. , relates to an improvement in a method of developing using a magnetic brush method.
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。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がある。Although an image 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１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
像剤および一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, for example,
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 one-component developer. .
上記の磁性キャリアと磁性トナーとを混合した現像剤を
使用する現像方法においては、従来の一成分系若しくは
二成分系におけるものと基本的には同様の現像方法を適
用できるのであるが、良好な画質を得るためには改良が
必要である。すなわち、従来方法においては、永久磁石
ロール固定スリーブ回転方式の場合に１通常は現像磁極
を感光ドラムの最接近位置く感光ドラム中心と永久磁石
ロール中心とを結ぶ直線上）に設置するのが多いが、磁
性キャリアと磁性トナーとを混合した現像剤を使用する
場合には、この方法では画像が必ずしも良好ではないと
いう問題点がある。種々実験の結果、現像磁極は上記従
来のものより若干ずらせた位置に置いた方が好結果が得
られるということが明らかになった。In the developing method using the above-mentioned developer mixed with magnetic carrier and magnetic toner, basically the same developing method as in the conventional one-component system or two-component system can be applied. Improvements are necessary to obtain image quality. That is, in the conventional method, in the case of a permanent magnet roll fixed sleeve rotation system, the developing magnetic pole is usually installed at the closest position to the photosensitive drum (on a straight line connecting the center of the photosensitive drum and the center of the permanent magnet roll). However, when using a developer containing a mixture of magnetic carrier and magnetic toner, this method has a problem in that the images are not necessarily good. As a result of various experiments, it has become clear that better results can be obtained by placing the developing magnetic pole at a position slightly shifted from the conventional one.
本発明は上記問題点を解消し、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。The present invention solves the above problems by using a developer made by mixing a magnetic carrier and a magnetic toner.
良好な画質の画像を得る静電荷像現像方法を提供するこ
とを目的とする。An object of the present invention is to provide an electrostatic charge image developing method that obtains images of good quality.
上記問題点解決のために１本発明においては。 One aspect of the present invention is to solve the above problems.
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を荷像現像方法において２表面に
複数個の磁極を有する固定永久磁石ロールと同軸的に配
設した非磁性材料からなるスリーブの回転によって現像
剤を画像担体表面に搬送し、前記固定永久磁石に設けた
現像磁極を９画像担体とスリーブとの最接近位置から、
スリーブ外径２６鶴以下のものでは０＜θ≦４０゜（θ
は中心角）、スリーブ外径２６ｍ超のものではＯ＜Ｌ≦
Ｌｏｍｍ（Ｌはスリーブ円周方向距離）ずらせて現像す
る。という技術的手段を採用したのである。In the static image development method, 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 developer is conveyed to the surface of the image carrier by rotation of a sleeve made of a non-magnetic material disposed coaxially with a fixed permanent magnet roll, and the developing magnetic pole provided on the fixed permanent magnet is brought into the closest position between the image carrier and the sleeve. From position,
For sleeves with an outer diameter of 26 mm or less, 0<θ≦40° (θ
is the central angle), and for sleeves with an outer diameter of over 26 m, O<L≦
Developing is performed with a shift of Lomm (L is the distance in the circumferential direction of the sleeve). This technical method was adopted.
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０図において１は画像担体であり、矢印方向に回転す
る。２は永久磁石ロールであり。The figure is a sectional view of a main part of an apparatus according to an embodiment of the present invention. In figure 0, numeral 1 is an image carrier, which rotates in the direction of the arrow. 2 is a permanent magnet roll.
表面に複数個のＮＳ磁極を非対称に配設して９画像担体
１と対向して設ける。３はスリーブであり。A plurality of NS magnetic poles are asymmetrically arranged on the surface and are provided facing the 9 image carriers 1. 3 is the sleeve.
ステンレス鋼等の非磁性材料により、中空円筒状に形成
すると共に、前記永久磁石ロール２と同軸的にかつ矢印
方向に回転自在に設ける０次に永久磁石ロール２の現像
磁極４ （この場合はＮ極の一つ）は３図に示すように
画像担体１とスリーブ３との最接近位置、すなわち画像
担体１の回転中心ＯＩとスリーブ３の回転中心０２とを
結ぶ直線５から、中心角θ若しくはスリーブ３上におけ
る円周方向距離したけずらせて配設する。６はドクター
ブレードであり、スリーブ３の略直上にスリーブ３と一
定の間隙を介して設ける。１はドクターブレード６とＳ
極とのスリーブ３上の円周方向距離である。The developing magnetic pole 4 of the zero-order permanent magnet roll 2 is formed of a non-magnetic material such as stainless steel into a hollow cylindrical shape, and is provided coaxially with the permanent magnet roll 2 and rotatable in the direction of the arrow. As shown in FIG. 3, one of the poles is at a central angle θ or from the closest position between the image carrier 1 and the sleeve 3, that is, the straight line 5 connecting the rotation center OI of the image carrier 1 and the rotation center 02 of the sleeve 3. They are arranged so as to be offset by a distance in the circumferential direction on the sleeve 3. Reference numeral 6 denotes a doctor blade, which is provided approximately directly above the sleeve 3 with a certain gap therebetween. 1 is doctor blade 6 and S
The circumferential distance on the sleeve 3 from the pole.
以上の構成により、永久磁石ロール２を固定してスリー
ブ３を矢印方向に回転させれば、現像剤槽内に収容され
た現像剤（何れも図示せず）は。With the above configuration, when the permanent magnet roll 2 is fixed and the sleeve 3 is rotated in the direction of the arrow, the developer (none of which is shown) contained in the developer tank is released.
ドクターブレード６とスリーブ３との間隙を経てスリー
ブ３によって搬送され、前記永久磁石ロール２の表面に
配設した現像１極４による磁気ブラシを形成しく図示せ
ず）２画像担体１の表面を摺擦する。従って画像担体１
の表面に形成した静電荷像を現像することができるので
ある。この場合スリーブ３は、外径］、６〜３２ｍｍ、
回転数６０〜４００ｒｐｍとするのがよい、また２が１
鶴より少ないと現像剤がドクターギャップから円滑に搬
送できなくなるのでＩＮ以上とするのがよい、なおドク
ターギャップは０．２〜０．８ ｔｍ、現像ギャップは
０．２〜１．Ｏｔｍの時に、特に良好な画像が得られる
。The image carrier 1 is conveyed by the sleeve 3 through the gap between the doctor blade 6 and the sleeve 3, and slides over the surface of the image carrier 1 (not shown) to form a magnetic brush by the developer 1 pole 4 disposed on the surface of the permanent magnet roll 2. Rub. Therefore image carrier 1
The electrostatic charge image formed on the surface of the material can be developed. In this case, the sleeve 3 has an outer diameter of 6 to 32 mm,
The rotation speed is preferably 60 to 400 rpm, and 2 is 1.
If the amount is less than 0.2 tm, the developer cannot be smoothly conveyed from the doctor gap, so it is better to make it 0.2 to 0.8 tm, and the development gap is 0.2 to 1.0 tm. Particularly good images are obtained at Otm.
次に画像評価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 for image evaluation will be described.
フェライトキャリア ６０重盪％（日立金属
製 ＫＢＮｌｏｏ）
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て作成した。Ferrite carrier: 60% by weight (KBNloo, manufactured by Hitachi Metals) Magnetic toner: 40% by weight Magnetic toner was prepared using the following blending ratio and process.
スチレンアクリル樹脂 ４８部（Ｍ、１−２５
４，０００ Ｍ、 ＝３６，０００）マグネタイト
５０部（戸田工業型 Ｅ Ｐ Ｔ
５００）
電荷制御剤 ２部（オリエント化
学製）
上記混合物を２００°Ｃで混練、冷却固化後、￥Ａ砕処
理し、疎水性シリカ（日本アエロジル類）を０．５部添
加して１２０’ Ｃで熱処理１分級等の処理により平均
粒径５〜２０μＩ９体積固有抵抗５×１０１４Ω・Ｃ請
の磁性トナーとした。Styrene acrylic resin 48 parts (M, 1-25
4,000 M, = 36,000) magnetite
50 copies (Toda Kogyo type E P T
500) Charge control agent 2 parts (manufactured by Orient Chemical Co., Ltd.) The above mixture was kneaded at 200°C, cooled and solidified, then subjected to ¥A crushing treatment, and 0.5 part of hydrophobic silica (Nippon Aerosil) was added to 120°C. A magnetic toner having an average particle diameter of 5 to 20 .mu.I and a volume resistivity of 5.times.10.sup.14 .OMEGA..multidot.C was obtained by heat treatment and classification.
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。まず画像担体１としてセレンドラム（周速１
５０ｍｍ／秒）を使用し、＋７２ＯＶで一様に帯電後９
表面に静電荷像を形成した。Image evaluation was performed using a developer prepared by mixing the magnetic toner prepared as described above and the ferrite carrier. First, as the image carrier 1, a selenium drum (peripheral speed 1
50mm/sec), and after uniformly charging at +72OV 9
An electrostatic charge image was formed on the surface.
スリーブ３の外径が２０龍および３０ｍのものについて
前記θ若しくはＬおよびｌを変化させて現像した結果を
各々第１表および第２表に示す、永久磁石ロール２は何
れも４極非対称のものを使用した。Tables 1 and 2 show the results of developing the sleeves 3 with outer diameters of 20m and 30m by changing θ, L, and l, respectively.The permanent magnet rolls 2 are all 4-pole asymmetric. It was used.
第 １ 表
スリーブ外径 ２０ｆｌ
第２表
スリーブ外径 ３０鶴
本実施例においては、磁性キャリアとしてフェライトキ
ャリアを使用する例を示したが、鉄粉。1st table Sleeve outer diameter 20fl 2nd table Sleeve outer diameter 30TsuruIn this embodiment, an example was shown in which a ferrite carrier was used as the magnetic carrier, but iron powder was used.
酸化鉄等の他の磁性キャリアでも作用は同一であル、マ
た永久磁石ロールに配設すべき磁極は、４極以外に他の
偶数橿非対称のものも使用できる。The effect is the same with other magnetic carriers such as iron oxide, and as for the magnetic poles to be arranged on the permanent magnet roll, in addition to the four poles, other even-numbered, asymmetric magnetic poles can also be used.
本発明は以上記述のような構成および作用であるから１
画像濃度および解像度が高い良好な画質の画像が得られ
るという効果がある。Since the present invention has the structure and operation as described above, 1
This has the effect that an image of good quality with high image density and resolution can be obtained.
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。
２：永久磁石ロール、３ニスリーブ、４：現像磁極。The figure is a sectional view of a main part showing an apparatus in an embodiment of the present invention. 2: Permanent magnet roll, 3 sleeves, 4: Developing magnetic pole.
Claims (3)
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、
表面に複数個の磁極を有する固定永久磁石ロールと同軸
的に配設した非磁性材料からなるスリーブの回転によっ
て現像剤を画像担体表面に搬送し、前記固定永久磁石に
設けた現像磁極を、画像担体とスリーブとの最接近位置
から、スリーブ外径２６ｍｍ以下のものでは０＜θ≦４
０°（θは中心角）、スリーブ外径２６ｍｍ超のもので
は０＜Ｌ≦１０ｍｍ（Ｌはスリーブ円周方向距離）ずら
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,
The developer is conveyed to the image carrier surface by rotation of a sleeve made of a non-magnetic material coaxially arranged with a fixed permanent magnet roll having a plurality of magnetic poles on the surface, and the developing magnetic pole provided on the fixed permanent magnet is transferred to the image carrier. From the closest position between the carrier and the sleeve, if the sleeve outer diameter is 26 mm or less, 0<θ≦4.
0° (θ is the center angle), and in the case of sleeves with an outer diameter of more than 26 mm, the development is performed with a shift of 0<L≦10 mm (L is the distance in the circumferential direction of the sleeve).
／ｓｅｃである特許請求の範囲第１項記載の静電荷像現
像方法。(2) The developer conveyance speed on the sleeve is 60 to 700 mm
The electrostatic image developing method according to claim 1, wherein the electrostatic charge image developing method is: /sec.
求の範囲第１項または第２項記載の静電荷像現像方法。(3) The electrostatic image developing method according to claim 1 or 2, wherein the magnetic carrier is a ferrite carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61208641A JP2659091B2 (en) | 1986-09-04 | 1986-09-04 | Electrostatic image development method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61208641A JP2659091B2 (en) | 1986-09-04 | 1986-09-04 | Electrostatic image development method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6363070A true JPS6363070A (en) | 1988-03-19 |
| JP2659091B2 JP2659091B2 (en) | 1997-09-30 |
Family
ID=16559603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61208641A Expired - Lifetime JP2659091B2 (en) | 1986-09-04 | 1986-09-04 | Electrostatic image development method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2659091B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04211286A (en) * | 1990-02-28 | 1992-08-03 | Hitachi Metals Ltd | Developing method |
| US5371571A (en) * | 1992-03-18 | 1994-12-06 | Hitachi Metals, Ltd. | Portable electrophotographic printer of reduced height |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59172660A (en) * | 1983-03-23 | 1984-09-29 | Mita Ind Co Ltd | Magnetic brush developing method using ferrite carrier |
| JPS60176056A (en) * | 1984-02-22 | 1985-09-10 | Minolta Camera Co Ltd | Method for developing electrostatic latent image |
-
1986
- 1986-09-04 JP JP61208641A patent/JP2659091B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59172660A (en) * | 1983-03-23 | 1984-09-29 | Mita Ind Co Ltd | Magnetic brush developing method using ferrite carrier |
| JPS60176056A (en) * | 1984-02-22 | 1985-09-10 | Minolta Camera Co Ltd | Method for developing electrostatic latent image |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04211286A (en) * | 1990-02-28 | 1992-08-03 | Hitachi Metals Ltd | Developing method |
| US5371571A (en) * | 1992-03-18 | 1994-12-06 | Hitachi Metals, Ltd. | Portable electrophotographic printer of reduced height |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2659091B2 (en) | 1997-09-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| EXPY | Cancellation because of completion of term |