JPS6363071A - Developing method for electrostatic charge image - Google Patents
Developing method for electrostatic charge imageInfo
- Publication number
- JPS6363071A JPS6363071A JP20864286A JP20864286A JPS6363071A JP S6363071 A JPS6363071 A JP S6363071A JP 20864286 A JP20864286 A JP 20864286A JP 20864286 A JP20864286 A JP 20864286A JP S6363071 A JPS6363071 A JP S6363071A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- developing
- developer
- image
- carrier
- 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 27
- 230000004907 flux Effects 0.000 claims abstract description 15
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 12
- 238000011161 development Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 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
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052711 selenium Inorganic materials 0.000 description 2
- 239000011669 selenium Substances 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
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 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
- 239000000969 carrier Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 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
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920005792 styrene-acrylic resin Polymers 0.000 description 1
- 239000000126 substance Substances 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 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 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。Therefore, the developer used in magnetic brush development is often a two-component developer that is a mixture of a magnetic carrier and a non-magnetic toner, while a one-component developer that is a mixture of a resin and magnetic powder is used as the developer. There is a way.
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, 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 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９通常は現像磁極
を感光ドラムの最接近位置（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、現像磁極を現像剤
の流れの上流側と下流側とに設けると共に３両者の磁束
密度を下流側の方を大にすると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 the permanent magnet roll fixed sleeve rotation method, the developing magnetic pole is usually installed at the closest position to the photosensitive drum (on the 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 good results can be obtained by providing developing magnetic poles on the upstream and downstream sides of the developer flow and increasing the magnetic flux density of both on the downstream side.
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.
カブリのない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。It is an object of the present invention to provide an electrostatic image developing method that produces images of good quality without fogging.
上記問題点解決のために２本発明においては。 In order to solve the above problems, the present invention has two aspects.
画像担体表面に形成した静電荷像を、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１表面に
複数個の磁極を等間隔かつ相隣る磁極が異極となるよう
に配設した固定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、前記固定永久磁石ロールに設けた現像磁極を９画
像担体とスリーブとの最近接位置から現像剤の流れの上
流側と下流側に配設させると共に、下流側の現像磁極の
磁束密度を上流側の現像磁極の磁束密度より大にして現
像する。という技術的手段を採用したのである。In an electrostatic charge image development method in which an electrostatic charge 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, a plurality of magnetic poles are arranged at equal intervals on one surface. and the developer is conveyed to the surface of the image carrier by a sleeve made of a non-magnetic material arranged coaxially with a fixed magnet roll arranged so that adjacent magnetic poles are different, and the developer is provided on the fixed permanent magnet roll. The developing magnetic poles are arranged on the upstream and downstream sides of the developer flow from the position closest to the image carrier and the sleeve, and the magnetic flux density of the downstream developing magnetic pole is made larger than the magnetic flux density of the upstream developing magnetic pole. Develop. This technical method was adopted.
上記のように構成することにより、まず現像剤の流れの
上流側の現像磁極上に形成された磁気ブラシによって画
像担体表面を摺擦すれば、静電荷像が現像される。次に
現像剤の流れの下流側の他の現像磁極上に形成された他
の磁気ブラシによって画像担体表面を再び摺擦すること
により、上記現像によって画像担体上の非画像部に付着
した磁性トナーを除去して磁気ブラシ中に回収する。こ
のようにしてカブリのない良好な画像が得られるのであ
る。With the above configuration, an electrostatic image is developed by first rubbing the surface of the image carrier with a magnetic brush formed on the developing magnetic pole on the upstream side of the developer flow. Next, by rubbing the image carrier surface again with another magnetic brush formed on another developing magnetic pole on the downstream side of the developer flow, the magnetic toner that has adhered to the non-image area on the image carrier due to the above development is removed. is removed and collected in a magnetic brush. In this way, a good image without fogging 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。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 showing an apparatus in an embodiment of the present invention. In the figure, 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磁極を対称に配設して１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 arranged symmetrically on the surface of one image carrier 1.
Provided opposite to. 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。次に永久磁石ロール２の現像
磁極Ｎ１およびＳｌは９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Ｏ１とスリー
ブ３０回転中心Ｏｘとを結ぶ直線５から、現像剤の流れ
の各々上流側と下流側とに配設する０本実施例において
は。It is made of a non-magnetic material such as stainless steel and has a hollow cylindrical shape, and is provided coaxially with the permanent magnet roll 2 and rotatable in the direction of the arrow. Next, the developing magnetic poles N1 and Sl of the permanent magnet roll 2 are moved from the closest position between the image carrier 1 and the sleeve 3, that is, from the straight line 5 connecting the rotation center O1 of the image carrier 1 and the rotation center Ox of the sleeve 30. In the present embodiment, the air filters are disposed on the upstream and downstream sides of the flow, respectively.
磁極を８個設けたものであるから、現像磁極Ｎ１および
Ｓｌは、前記直線５から中心角が２２．５°の位置にあ
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。Since eight magnetic poles are provided, the developing magnetic poles N1 and Sl are located at a central angle of 22.5° from the straight line 5. Reference numeral 6 denotes a doctor blade, which is provided approximately directly above the sleeve 3 with a certain gap therebetween.
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表面に配
設した現像磁極Ｎ＋ 、Ｓｔ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、現像剤の流れの上流側にある
現像磁極Ｎｌ上に形成された磁気ブラシによって９画像
担体１上の静電荷像が現像され１次に下流側の現像磁掻
Ｓ、上に形成された他の磁気ブラシによって再び画像担
体１表面を摺擦することにより、上記現像によって画像
担体１上の非画像部に付着した余剰の磁性トナーを除去
し、上記磁気ブラシ中に回収するのである。このような
作用を得るためには。It is conveyed by the sleeve 3 through the gap between the doctor blade 6 and the sleeve 3, and slides the surface of the image carrier 1 (not shown) to form a magnetic brush by the developing magnetic poles N+ and St disposed on the surface of the permanent magnet roll 2. Rub. Therefore, the electrostatic charge image formed on the surface of the image carrier 1 can be developed. In this case, an electrostatic charge image on the image carrier 1 is developed by the magnetic brush formed on the developing magnetic pole Nl on the upstream side of the developer flow, and is then formed on the developing magnetic pole S on the downstream side. By rubbing the surface of the image carrier 1 again with another magnetic brush, the excess magnetic toner adhering to the non-image area on the image carrier 1 due to the development is removed and collected into the magnetic brush. To get this kind of effect.
磁極Ｓ１の磁束密度を磁極Ｎ、の磁束密度より大きくす
ることが有効であり、特に磁極Ｓｌを磁極Ｎ、より５０
部以上大にするとよい、なおスリーブ３は外径１６〜３
２ｍ、回転数５０〜４００ｒｐｍとするのがよい、また
ドクターギャップは０．２〜０．８ｍ、現像ギャップは
０．２〜１．Ｑｍｍであれば特に良好な画像が得られる
。It is effective to make the magnetic flux density of the magnetic pole S1 larger than the magnetic flux density of the magnetic pole N. In particular, it is effective to make the magnetic flux density of the magnetic pole S1 larger than the magnetic flux density of the magnetic pole N.
The sleeve 3 should have an outer diameter of 16 to 3 mm.
2 m and a rotational speed of 50 to 400 rpm, the doctor gap is 0.2 to 0.8 m, and the developing gap is 0.2 to 1. Qmm, particularly good images can be obtained.
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重量％（日立金属
製 ＫＢＮ−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て作成した。Ferrite carrier: 60% by weight (KBN-100, manufactured by Hitachi Metals) Magnetic toner: 40% by weight A magnetic toner was prepared using the following blending ratio and process.
スチレンアクリル樹脂 ４８部ＣＭ、 ＝ ２
５０，０００ Ｍ、１＝３６，０００）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
学型 ボントロンＥ８１）上記混合物を２００°Ｃで混
練、冷却固化後、粉砕処理し、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２分
級等の処理により平均粒径５〜２０μｍ２体積固有抵抗
５×１０′４Ω・ｃＩｌｌの磁性トナーとした。Styrene acrylic resin 48 parts CM, = 2
50,000 M, 1=36,000) Magnetite 50 parts (Toda Kogyo type E P
T500) Charge control agent 2 parts (Orient chemical type Bontron E81) The above mixture was kneaded at 200°C, cooled and solidified, then pulverized, 0.5 part of hydrophobic silica (Nippon Aerosil) was added, and the mixture was heated at 120°C. A magnetic toner having an average particle size of 5 to 20 μm and a volume resistivity of 5×10'4 Ω·cIll was obtained by heat treatment and 2-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
５０ｎ／秒）を使用し、＋７２０■で一様に帯電後１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
50 n/sec), and after uniformly charging at +720 ■, an electrostatic charge image was formed on one surface.
現像磁極ＮＩおよびＳ、の磁束密度を変化させて現像し
た結果を表に示す、なお永久磁石ロール２は８極対称着
磁とし、スリーブ３の外径を２４ｍとし、ドクターギャ
ップを０．２５ｍｍ、現像ギャップを０．３５ｍとした
。The table shows the results of development by changing the magnetic flux densities of the developing magnetic poles NI and S. The permanent magnet roll 2 is 8-pole symmetrically magnetized, the outer diameter of the sleeve 3 is 24 m, the doctor gap is 0.25 mm, The development gap was set to 0.35 m.
（注）区分Ａに示すものは、従来同様にＮ、をセレンド
ラムとスリーブとの中心を結ぶ線上に置いたものである
。上記の表から磁極Ｎ、と３１との磁束密度の差が大に
なるとカプリが少なくなることがわかる。なおこの場合
に画像濃度には大きな変化はない。(Note) In the case shown in section A, N is placed on the line connecting the centers of the selenium drum and the sleeve, as in the conventional case. From the table above, it can be seen that as the difference in magnetic flux density between the magnetic poles N and 31 increases, the capri decreases. Note that in this case, there is no significant change in image density.
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。In this example, an example is shown in which a ferrite carrier is used as the magnetic carrier, but iron powder may also be used.
酸化鉄等の他の磁性キャリアでも作用は同一である。ま
た永久磁石ロールに配設すべき磁極は、現像磁極も含め
て６〜１６極のものが使用できる。The effect is the same with other magnetic carriers such as iron oxide. Further, as the magnetic poles to be arranged on the permanent magnet roll, 6 to 16 magnetic poles including the developing magnetic pole can be used.
なおスリーブを接地する構成により、磁性トナーに滞溜
した。静電荷像と同極性の電荷は、磁性キャリアを介し
てスリーブに流れるため、これによっても前記カブリ防
止作用が得られるのである。Note that due to the configuration in which the sleeve is grounded, magnetic toner accumulates in the toner. Charges having the same polarity as the electrostatic charge image flow to the sleeve via the magnetic carrier, and this also provides the anti-fogging 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、Ｎ＋、Ｓ＋：現像
磁掻。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, N+, S+: Development magnetic scratcher.
Claims (5)
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等間隔かつ相隣る磁極が異極とな
るように配設した固定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、前記固定永久磁石ロールに設けた現像磁極
を、画像担体とスリーブとの最近接位置から現像剤の流
れの上流側と下流側に配設させると共に、下流側の現像
磁極の磁束密度を上流側の現像磁極の磁束密度より大に
し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 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 a sleeve made of a non-magnetic material coaxially arranged with a fixed magnet roll having a plurality of magnetic poles arranged on the surface at equal intervals so that adjacent magnetic poles have different polarities. , the developing magnetic poles provided on the fixed permanent magnet roll are arranged on the upstream and downstream sides of the developer flow from the closest position between the image carrier and the sleeve, and the magnetic flux density of the downstream developing magnetic pole is set on the upstream side. A method for developing an electrostatic image, characterized in that development is carried out at a magnetic flux density greater than that of a developing magnetic pole.
／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.
の磁束密度より５０Ｇ以上大である特許請求の範囲第１
項ないし第３項何れかに記載の静電荷像現像方法。(4) Claim 1, in which the magnetic flux density of the downstream developing magnetic pole is greater than the magnetic flux density of the upstream developing magnetic pole by 50 G or more.
The method for developing an electrostatic image according to any one of items 1 to 3.
範囲第１項ないし第４項何れかに記載の静電荷像現像方
法。(5) The electrostatic image developing method according to any one of claims 1 to 4, wherein the number of magnetic poles is 6 to 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20864286A JPS6363071A (en) | 1986-09-04 | 1986-09-04 | Developing method for electrostatic charge image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20864286A JPS6363071A (en) | 1986-09-04 | 1986-09-04 | Developing method for electrostatic charge image |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6363071A true JPS6363071A (en) | 1988-03-19 |
Family
ID=16559621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20864286A Pending JPS6363071A (en) | 1986-09-04 | 1986-09-04 | Developing method for electrostatic charge image |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6363071A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS604967A (en) * | 1983-06-24 | 1985-01-11 | Fuji Xerox Co Ltd | Developing device of electrophotographic copying machine |
-
1986
- 1986-09-04 JP JP20864286A patent/JPS6363071A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS604967A (en) * | 1983-06-24 | 1985-01-11 | Fuji Xerox Co Ltd | Developing device of electrophotographic copying machine |
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