JPS62297857A - Ferrite carrier for electrophotographic development - Google Patents
Ferrite carrier for electrophotographic developmentInfo
- Publication number
- JPS62297857A JPS62297857A JP61140334A JP14033486A JPS62297857A JP S62297857 A JPS62297857 A JP S62297857A JP 61140334 A JP61140334 A JP 61140334A JP 14033486 A JP14033486 A JP 14033486A JP S62297857 A JPS62297857 A JP S62297857A
- Authority
- JP
- Japan
- Prior art keywords
- ferrite carrier
- carrier
- ferrite
- particles
- electrophotographic development
- 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
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 34
- 238000011161 development Methods 0.000 title claims description 15
- 239000002245 particle Substances 0.000 claims abstract description 25
- 230000005415 magnetization Effects 0.000 claims abstract description 10
- 230000035699 permeability Effects 0.000 claims abstract description 8
- 239000012798 spherical particle Substances 0.000 claims abstract 3
- 229910000473 manganese(VI) oxide Inorganic materials 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 5
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 abstract description 3
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 abstract description 3
- VASIZKWUTCETSD-UHFFFAOYSA-N manganese(II) oxide Inorganic materials [Mn]=O VASIZKWUTCETSD-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000969 carrier Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- -1 Cub Inorganic materials 0.000 description 2
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 description 2
- 239000012050 conventional carrier Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- YADSGOSSYOOKMP-UHFFFAOYSA-N lead dioxide Inorganic materials O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012360 testing method 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
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/107—Developers with toner particles characterised by carrier particles having magnetic components
- G03G9/108—Ferrite carrier, e.g. magnetite
- G03G9/1085—Ferrite carrier, e.g. magnetite with non-ferrous metal oxide, e.g. MgO-Fe2O3
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/107—Developers with toner particles characterised by carrier particles having magnetic components
- G03G9/1075—Structural characteristics of the carrier particles, e.g. shape or crystallographic structure
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
産業上の利用分野
本発明は、電子複写機やレーザービームプリンター等に
使用される電子写真用現像剤に関するものでおり、特に
、二成分系現像剤におけるキャリアの改良に関するもの
でおる。Detailed Description of the Invention 3. Detailed Description of the Invention Industrial Application Field The present invention relates to an electrophotographic developer used in electronic copying machines, laser beam printers, etc., and in particular, a two-component developer. This paper relates to the improvement of carriers in developers.
従来の技術
電子写真の現像法としては、カスケード現像法や磁気ブ
ラシ現像法など多くの方法があり、これら各種の現像法
に使用される現像剤には一成分系現像剤と二成分系現像
剤とがある。Conventional technology There are many development methods for electrophotography, such as cascade development and magnetic brush development.The developers used in these various development methods include one-component developers and two-component developers. There is.
二成分系現像剤は、周知のようにトナーおよびキャリア
から構成されるが、キレリアには、■適当な摩擦帯電性
を持もトナー粒子を吸引すること、■緻密であり粒子の
強度が十分で粒の破壊が生じないこと、■粒子か流動性
に富むこと、■）泣子径が均一であること、■、拉子表
面の状態が湿度等によって変わらず９種々の特性が支足
していること、■十分な引張り強度および圧縮強度を有
すること、■適切な飽和磁化・透Ｉｆｆ率・および保磁
力を有すること、などの諸性性が要求される。As is well known, a two-component developer is composed of toner and carrier, but Kyrelia has two characteristics: 1. It has appropriate triboelectric charging properties and attracts toner particles, 2. It is dense and the particles have sufficient strength. The particles do not break, ■ The particles have good fluidity, ■) The particle size is uniform, ■ The condition of the particle surface does not change depending on humidity, etc., and 9 various characteristics are supported. It is required to have various properties such as (1) having sufficient tensile strength and compressive strength, and (2) having appropriate saturation magnetization, permeability, and coercive force.
キャリア粒子としては、従来から種々の材料が使用され
てきているが、現在量も多く用いられているものとして
鉄粉がおる。鉄粉キャリアは、一般にその表面に適当な
処理をして使用しているが、それでも、長時間使用する
と粒子の表面が物理的あるいは科学的に変化して、トナ
ーが付着してしまったり、あるいは使用環境の湿度に敏
感になって画像の鮮明度がうすれたりするため、その寿
命が短いという欠点があった。Various materials have conventionally been used as carrier particles, and iron powder is currently used in large quantities. Iron powder carriers are generally used with appropriate surface treatment, but even so, when used for a long time, the surface of the particles may change physically or chemically, causing toner to adhere to it, or It has the disadvantage of a short lifespan because it becomes sensitive to the humidity of the environment in which it is used, causing the image clarity to fade.
発明が解決しようとする問題点
このため、近年、上記鉄粉キャリアの欠点を解消するも
のとして、フェライト粒子をキャリアとして使用するこ
とが提案されている（特開昭第５２−５６５３６月公報
、特開昭第５８−２Ｏ２４５６号公報等）。Problems to be Solved by the Invention Therefore, in recent years, it has been proposed to use ferrite particles as a carrier in order to solve the above-mentioned drawbacks of iron powder carriers (Japanese Unexamined Patent Publication No. 52-56536, (Kaisho No. 58-2O2456, etc.).
しかしながら、従来実用化されているフェライトキャリ
アは、特定のトナーおよび電子写真は器で使用した時に
は鉄粉キャリアに無い勝れた特性を発揮するものの、対
象とするトナーまたは機器が異なると現像にあずかる帯
電特性が変化するためにコピー濃度が変化したりかぶり
が生じたりすることがあるため、画像特性あるいは寿命
の点で必ずしも満足し得るものではない、ということが
最近指摘され問題視されている。However, although the ferrite carriers that have been put into practical use exhibit superior properties that iron powder carriers do not have when used with specific toners and electrophotographic equipment, they have problems when used in development when the target toner or equipment differs. It has recently been pointed out and viewed as a problem that the copy density may change or fog may occur due to changes in the charging characteristics, so that they are not necessarily satisfactory in terms of image characteristics or lifespan.
本発明は、上記従来の電子写真現像用キャリアの欠点を
なくし、画像濃度が容易に得られかつ画像特性に優れ寿
命の永い電子写真用二成分系現像剤が実現できるキャリ
アを提供することを目的とするものである。It is an object of the present invention to provide a carrier that eliminates the drawbacks of the conventional carrier for electrophotographic development, and enables the realization of a two-component developer for electrophotography that can easily obtain high image density, has excellent image characteristics, and has a long life. That is.
問題点を解決するための手段
上記目的を達成するために、本発明は、モル比でＬｉ２
Ｏ２〜１５％、Ｍｎ０３〜５０％、およびＦｅ２Ｏ３５
５〜９５％からなる組成であって、平均粒径が１０〜５
００ ｔｉｍの球状のフェライト粒子からキャリアを構
成したことを主たる特徴とするものである。Means for Solving the Problems In order to achieve the above objects, the present invention provides a molar ratio of Li2
O2~15%, Mn03~50%, and Fe2O35
The composition consists of 5 to 95%, and the average particle size is 10 to 5.
The main feature is that the carrier is composed of spherical ferrite particles of 0.00 tim.
本発明者等は、従来のフェライトキャリアについて調査
・検討した結果、画質に影響を及ぼす帯電量を調整する
に際し電気抵抗を変えるのみでは、それぞれの複写機等
の現像機構などの違いにより全く効果を発揮しない場合
がおることを知り、フェライトキャリアの材料組成と帯
電量との関係。As a result of research and study on conventional ferrite carriers, the present inventors found that simply changing the electrical resistance when adjusting the amount of charge that affects image quality is not effective at all due to differences in the developing mechanism of each copying machine, etc. Knowing that there are cases where the ferrite carrier does not exhibit the desired effect, we investigated the relationship between the material composition of the ferrite carrier and the amount of charge.
およびそれらとコピー濃度との関係等を種々実験・検討
した結果、飽和磁化の向上と相俟って容易に所望のコピ
ー濃度が得られるフェライトキャリアの組成領域を見出
し、それに基づいて本発明を完成したものである。As a result of various experiments and studies on the relationship between these and the copy density, we found a composition range of the ferrite carrier in which the desired copy density can be easily obtained in combination with improved saturation magnetization, and based on this, we completed the present invention. This is what I did.
本発明において、Ｌｉ２Ｏ，ＭｎＯ，およびＦｅ２Ｏ３
の各成分は、フェライトキレリアとしての特性を１昇る
ための基本成分であり、その含有量か、モル比でＬｉ２
Ｏ２〜１５％、 Ｍ ｎ Ｑ ３〜５０％、Ｆｅ２Ｏ３
５５〜９５％の範囲内であれば良い。In the present invention, Li2O, MnO, and Fe2O3
Each component is a basic component to increase the characteristics of ferrite chirelia by 1, and its content or molar ratio is Li2
O2~15%, MnQ 3~50%, Fe2O3
It may be within the range of 55 to 95%.
〜ＩｎＯは画像）震度に顕著に影響を及ぼす帯電量制御
に大きく寄与フるものであり、ＭｎＯが３％未満ては帯
電量制御効果が少なく、最適な画像濃度をｊｄることか
出来ない。また、Ｍｎ ｏ 、およびＦｅ２Ｏ３は飽和
磁化と初Ｊ ’ｈ４Ｎ率の変化に対し効果を及ぼすもの
で、前記組成範囲内において１−ｉ２Ｏを含むそれら成
分が相互に固溶しあうことによって、本発明の特長の一
つである高飽和磁化と最適初透磁率が得られるものであ
る。~InO greatly contributes to controlling the amount of charge that significantly affects the seismic intensity (image), and if MnO is less than 3%, the effect of controlling the amount of charge is small and it is not possible to achieve the optimum image density. In addition, Mno and Fe2O3 have effects on changes in saturation magnetization and initial J'h4N ratio, and as these components including 1-i2O form a solid solution with each other within the above composition range, the present invention One of its features is high saturation magnetization and optimal initial permeability.
すなわち、本発明においては、Ｌ！ ２Ｏ２〜１５％、
Ｍ ｎ ０．３〜５０． Ｆ ｅ ２Ｏ３５５〜９５
％の基本組成を、そのまま焼結、または焼結促進剤とし
てＶ２Ｏ５などの低融点の金属酸化物を、または金属酸
化物となり得る金属塩類を１．０重量％以下の少量含有
させることによって、電気抵抗を１０２〜１０１０Ω−
ｃｍ、飽和磁化を５５〜７５ｅｍｕ ／ ｇ 、保磁力
を１〜５０Ｑ ｅ 、初透磁率を２〜７の範囲にそれぞ
れ保持することができるものでおる。これらの特性と帯
電量および画質とのからみによって画像濃度の良い画像
が得られるのである。That is, in the present invention, L! 2O2~15%,
Mn 0.3-50. Fe2O355~95
% of the basic composition is sintered as is, or by adding a low melting point metal oxide such as V2O5 as a sintering accelerator, or a small amount of metal salts that can become metal oxides to an electric potential of 1.0% by weight or less. Resistance 102~1010Ω-
cm, saturation magnetization in the range of 55 to 75 emu/g, coercive force in the range of 1 to 50 Qe, and initial permeability in the range of 2 to 7. An image with good image density can be obtained by combining these characteristics with the amount of charge and image quality.
本発明において、焼結促進剤としては、例えば、Ｖ２Ｏ
５・ＡＳ２Ｏ３・Ｂｉ２Ｏ３・５ｂ２Ｏ３・ＰｂＯ２，
Ｃｕｂ、 Ｂ ２Ｏ３． Ｓ ｉ Ｏ２，ＣａＯやｃｓ
、Ｎｂなどの希土類化合物が適用されるが、この他にも
、例えば、Ｌ ｉ ２ＣＯ３、Ｃｕ５Ｏ４゜Ｃｕ Ｃ
ｌ ２ 、ＣａＣ０３等の加熱により金属酸化物とな
り１ｑる金属化合物も適用できる。In the present invention, examples of the sintering accelerator include V2O
5・AS2O3・Bi2O3・5b2O3・PbO2,
Cub, B2O3. S i O2, CaO and cs
, Nb and other rare earth compounds are applied, but in addition to these, for example, L i 2CO3, Cu5O4°Cu C
Metal compounds that turn into metal oxides when heated, such as l 2 and CaC03, can also be used.
また、本発明において、キャリア粒子は、その平均粒径
が２Ｏ〜５００μｍの範囲内におる球状のものであるこ
とが望ましく、特殊な静電記録などの用途の場合を除い
ては、粒径が２Ｏμｍ未満の場合には、キャリア飛散な
どがあり、一方、粒径が５００μｍを越える場合には、
画像そのものが粗となり、好ましくない。Further, in the present invention, the carrier particles are preferably spherical with an average particle size within the range of 20 to 500 μm, and except for special uses such as electrostatic recording, the particle size is If the particle size is less than 20 μm, carrier scattering may occur, while if the particle size exceeds 500 μm,
The image itself becomes rough, which is not desirable.
また、本発明において、上記電子写真現像用フェライト
キトリアは、その電気抵抗率が１０２Ω・ｃｍ以上、飽
和磁化値が５５〜７５ｅｍｕ ／ ｔ３の範囲内でおる
ことが望ましい。その理由は、電気抵抗率が１０２Ω・
ｃｍ未満の場合には摩擦帯電量を適当な値に制御するこ
とが難しく、目的とする鮮明な画像を得ることが困難に
なるためでおる。また、飽和磁化値が５５ｅｍｕ ／
’Ｊより小ざい場合には、磁気ロールとの吸着力が落ち
磁気ブラシが小さくなるため、目標とする高濃度でかつ
鮮明な画像を得ることは困難となり、一方、飽和磁化値
が７５８ｍＵ／９を越える場合には磁力が強いために磁
気ブラシが鎖状となり易く中間調の良い画像が得にくい
ためである。Further, in the present invention, it is preferable that the ferrite chitria for electrophotographic development has an electrical resistivity of 102 Ω·cm or more and a saturation magnetization value of 55 to 75 emu/t3. The reason is that the electrical resistivity is 102Ω・
This is because if it is less than cm, it is difficult to control the amount of triboelectric charge to an appropriate value, making it difficult to obtain the desired clear image. In addition, the saturation magnetization value is 55 emu /
If it is smaller than 'J, the adsorption force with the magnetic roll will decrease and the magnetic brush will become smaller, making it difficult to obtain the target high density and clear image.On the other hand, the saturation magnetization value will be 758mU/9 This is because if the magnetic force exceeds 100, the magnetic brush is likely to become chain-like due to the strong magnetic force, making it difficult to obtain an image with good halftones.
また、本発明において、上記フェライトキャリアの保磁
力１−ＩＣが５００ ｅを越える場合には、粒子そのも
のが永久磁石の性質を持ちマグロール等に強く密着して
現像にあずかるトナーの流動性を悪くするために、両像
むらが発生し良質な画像は得られなくなるので、その保
磁力は５００８以下でおることが望ましい。In addition, in the present invention, if the coercive force 1-IC of the ferrite carrier exceeds 500 e, the particles themselves have the property of a permanent magnet and strongly adhere to a mag roll, etc., impairing the fluidity of the toner used for development. Therefore, it is desirable that the coercive force is 5008 or less, since image unevenness occurs and a good quality image cannot be obtained.
また、本発明において、より好ましい効果を１ｑようと
する場合には、微粉体の測定における透磁率が２以上の
ものであることが好ましい。透磁率が２未満のものでは
磁気ロールへの反応が悪くなり、またトナー濃度の制御
など実用的な面からも画質に影響を与える恐れがあるた
めである。In addition, in the present invention, in order to achieve a more preferable effect of 1q, it is preferable that the magnetic permeability in the measurement of the fine powder is 2 or more. This is because if the magnetic permeability is less than 2, the reaction to the magnetic roll will be poor, and the image quality may also be affected from a practical standpoint such as toner concentration control.
さらにまた、フェライトキャリアを現像剤として用いる
場合、現像温度が実用上５０〜６０℃に昇温するため、
本発明におけるフェライトキャリアのキュリー湿度は１
００℃以上であることが望ましい。Furthermore, when a ferrite carrier is used as a developer, the development temperature practically increases to 50 to 60°C.
The Curie humidity of the ferrite carrier in the present invention is 1
It is desirable that the temperature is 00°C or higher.
また、フェライトキャリアは耐摩耗性であること、ひい
ては長寿命につながることなどからフェライト粒子の破
壊強度は５Ｋｇ／ｍｍ２以上であることが望ましい。Further, since the ferrite carrier is wear resistant and leads to a long life, it is desirable that the breaking strength of the ferrite particles is 5 kg/mm2 or more.
実施例
以下、本発明を実施例に基づいて、より詳細に説明する
。EXAMPLES Hereinafter, the present invention will be explained in more detail based on examples.
（実施例１）
モル比で、第１表に示す各種組成の試料となるように原
料をそれぞれ秤量し、ボールミルにより混合した。得ら
れた混合粉を８００〜１０００℃で仮焼し、仮焼した試
料はアトライターにより粉砕した。(Example 1) Raw materials were weighed and mixed in a ball mill so that the samples had the various compositions shown in Table 1 in terms of molar ratio. The obtained mixed powder was calcined at 800 to 1000°C, and the calcined sample was pulverized with an attritor.
粉砕後の粒径を、空気透過法を用いて測定した結果、平
均粒径で約１．０μｍでおった。次いで、粉砕した試料
に、バイングーとしてＰ、Ｖ、Ａ （ポリビニルアルコ
ール）の水溶液（Ｐ、Ｖ、ＡＷとしでは０．５〜５．０
ｗｔ％）を加え、スプレードライヤーにより造粒した。The particle size after pulverization was measured using an air permeation method, and the average particle size was approximately 1.0 μm. Next, an aqueous solution of P, V, A (polyvinyl alcohol) (0.5 to 5.0 for P, V, AW) was added to the crushed sample as bangu.
wt%) and granulated using a spray dryer.
得られた造粒粉を、アルミナ製の容器に入れて１２５０
’Ｃで焼成した。なお、本発明を実施するに際し、造
粒粉を多量に容器に入れて焼成する場合には、焼成の際
に粒成長して粒同志が接合することが必るため、ロータ
リーキルン等で試料を回転しながら焼成することが好ま
しい。このようにして得られた平均粒子径的７０μｍの
フェライト粒子の物理的特性を、第１表に示す。The obtained granulated powder was placed in an alumina container and heated to 1250 ml.
'C fired. Note that when carrying out the present invention, if a large amount of granulated powder is placed in a container and fired, it is necessary to rotate the sample in a rotary kiln, etc., as the grains must grow and join together during firing. It is preferable to bake while Table 1 shows the physical properties of the ferrite particles having an average particle diameter of 70 μm thus obtained.
これらの球状フェライトをトナーキャリアとして使用し
二成分現像剤を作製し、感光体にセレンを用いたＡ社製
およびＢ社製の二台の電子複写殿を使って、現像ギヤツ
ブ約１．０〜ｉ、２ｍｍ、スリーブと感光体の間隔１．
０ｍｍの条件で、それぞれ１５万枚のコピー試験をした
ところ、本発明による上記各組成のフェライトキャリア
によるものは、いずれも初期濃度１．４０から１．２５
〜１．３５の範囲内の濃度変化であり、機種による差異
は認められなかった。これに対し、比較のため、従来の
フェライトキャリアを用いて同一条件で試験したところ
、Ａ社のものでは初期濃度１．４０であったものが１．
１５まで低下したのに、８社のものでは１．４０から１
．３０まで低下したのみであり、機種による差異があっ
た。A two-component developer was prepared using these spherical ferrites as a toner carrier, and two electronic duplicators made by Company A and Company B, each using selenium as a photoconductor, were used to develop a developing gear of approximately 1.0 to 1.0 mm. i, 2mm, distance between sleeve and photoreceptor 1.
When a copying test was conducted on 150,000 copies each under the condition of 0 mm, the initial density of all the ferrite carriers of the above compositions according to the present invention was 1.40 to 1.25.
The density change was within the range of ~1.35, and no difference was observed depending on the model. On the other hand, for comparison, when a conventional ferrite carrier was tested under the same conditions, the initial concentration of Company A's carrier was 1.40, but it was 1.40.
15, but for eight companies it was 1.40 to 1.
．． It only decreased to 30, and there were differences depending on the model.
キャリア寿命は、通常、各社により設定された枚数をコ
ピーした俊でも画像濃度１．２以上必要とされており、
従来のものに比べ本発明のフェライトキャリアは機種に
よるバラツキもなく優れていることが判った。尚、上記
結果において、Ａ社の複写機における従来のフェライト
キャリアの帯電量は２５μＣ／９から３７μＧ／９に変
化しており、帯電量の上昇によりコピー濃度が低下した
ものと考えられる。一方、本発明のフェライトキャリア
の帯電♀は初期帯電量の±２μＣ／９稈度と殆ど変化し
ておらず、これが長寿命の理由と考えられる。The lifespan of the carrier is normally required to be an image density of 1.2 or higher even after copying the number of copies set by each company.
It has been found that the ferrite carrier of the present invention is superior to conventional carriers without any variation depending on the model. In the above results, the charge amount of the conventional ferrite carrier in the copying machine of Company A changed from 25 μC/9 to 37 μG/9, and it is considered that the copy density decreased due to the increase in the charge amount. On the other hand, the charge ♀ of the ferrite carrier of the present invention hardly changes from the initial charge amount to ±2 μC/9 degrees, which is considered to be the reason for the long life.
尚、上述した本発明の実施例においては、混合法として
ボールミルを使用したが、撮動ミルまたはミキサー等を
用いても良い。また、粉砕機としてはアトライターを使
用したが、これも、ホールミルまたは、振動ミル等、他
の公知の粉砕機を用いて良いことは言うまでもない。In the above-described embodiments of the present invention, a ball mill was used as a mixing method, but a video mill, a mixer, or the like may also be used. Further, although an attriter was used as the pulverizer, it goes without saying that other known pulverizers such as a whole mill or a vibration mill may also be used.
発明の効果
以上の如く、本発明フェライトキャリアは、従来使用さ
れている鉄粉キレリアに比へ、高抵抗で長寿命でおるこ
とが判明し、電子複写機やレーザービームプリンタ用の
現像剤として使用した場合にその工業的応用価値は大で
ある。Effects of the Invention As described above, the ferrite carrier of the present invention has been found to have higher resistance and longer life than the conventionally used iron powder Kyrelia, and can be used as a developer for electronic copying machines and laser beam printers. In this case, its industrial application value is great.
手 続 補 正 書
昭和６２年１月物日
特許庁長官 黒 １）明 雄 殿
１、事件の表示
昭和６１年特許願第１４０３３４号
２、発明の名称
電子写真現像用フェライトキャリア
３、補正をする者
事件との関係 特 許 出願人
住所 東京都千代田区丸の内二丁目１番２号名称 （
５０８） 日 立 金 属 株式会社４、代理人〒１
０５
５、補正命令の日付 な しく自発補正）６、補正
により増加する発明の数 な し７、補正の対象
明細書の発明の詳細な説明の欄。Procedures Amendment Written by the Commissioner of the Japan Patent Office on January 1986 Black 1) Mr. Yu Akira1, Indication of the case 1988 Patent Application No. 1403342, Title of invention Ferrite carrier for electrophotographic development 3, Make amendments. Relationship with the patent case Patent Applicant Address 2-1-2 Marunouchi, Chiyoda-ku, Tokyo Name (
508) Hitachi Metals Co., Ltd. 4, Agent 〒1
05 5. Date of amendment order (No spontaneous amendment) 6. Number of inventions increased by amendment None 7. Subject of amendment
Detailed description of the invention in the specification.
８、補正の内容
（１）第４頁第８行の「寿命の永い」を「寿命の長い」
に訂正する。8. Contents of amendment (1) Changed “long life” from line 8 of page 4 to “long life”
Correct to.
（２）第５頁第１２行のｒＬｉ ２Ｏ２〜１５％」を「
し１２Ｏ２〜１５％」に訂正する。(2) “rLi2O2~15%” on page 5, line 12
Corrected to 12O2~15%.
（３）同頁第１９行から第２Ｏ行のｒＬｉ２ＯＪを「Ｌ
ｉ２Ｏ」に訂正する。(3) rLi2OJ from line 19 to line 2O on the same page is “L
i2O”.
（４）第９頁第１行のｒ５ｋｑ ／ｍｍ２ Ｊを「５ｋ
ｇ／ｍｌ１１２」に訂正する。(4) Change r5kq /mm2 J in the first line of page 9 to “5k
Corrected to ``g/ml 112''.
（５）第１３頁第２行の［２５μＣ／（ｌから３７μＣ
／（ＩＪを「−２５μＣ／ｇから一３７μｃ／ｇＪに訂
正する。(5) Page 13, line 2 [25μC/(l to 37μC
/(Correct IJ from -25μC/g to -37μC/gJ.
Claims (5)
０％、およびＦｅ＿２Ｏ＿３５５〜９５％からなり、平
均粒径が１０〜５００μｍの球状粒子からなることを特
徴とする電子写真用フェライトキャリア。(1) In molar ratio, Li_2O2~15%, MnO3~5
A ferrite carrier for electrophotography, characterized in that it consists of spherical particles having an average particle size of 10 to 500 μm and comprising 0% and 355 to 95% of Fe_2O_2O.
る特許請求の範囲第１項記載の電子写真現像用フェライ
トキャリア。(2) The ferrite carrier for electrophotographic development according to claim 1, which has an electrical resistivity of 10^2 Ω·cm or more.
０Ｏｅ以下、初透磁率が２以上である特許請求の範囲第
１項または第２項のいずれかに記載の電子写真現像用フ
ェライトキャリア。(3) Saturation magnetization value is 55 to 75 emu/g, coercive force is 5
The ferrite carrier for electrophotographic development according to claim 1 or 2, which has an initial magnetic permeability of 0 Oe or less and an initial magnetic permeability of 2 or more.
囲第１項乃至第３項のいずれかに記載の電子写真現像用
フェライトキャリア。(4) The ferrite carrier for electrophotographic development according to any one of claims 1 to 3, which has a Curie temperature of 100°C or higher.
許請求の範囲第１項乃至第４項のいずれかに記載の電子
写真現像用フェライトキャリア。(5) The ferrite carrier for electrophotographic development according to any one of claims 1 to 4, wherein the particles have a breaking strength of 5 kg/mm^2 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61140334A JPS62297857A (en) | 1986-06-18 | 1986-06-18 | Ferrite carrier for electrophotographic development |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61140334A JPS62297857A (en) | 1986-06-18 | 1986-06-18 | Ferrite carrier for electrophotographic development |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62297857A true JPS62297857A (en) | 1987-12-25 |
Family
ID=15266408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61140334A Pending JPS62297857A (en) | 1986-06-18 | 1986-06-18 | Ferrite carrier for electrophotographic development |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62297857A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01223471A (en) * | 1988-03-03 | 1989-09-06 | Canon Inc | Carrier for electrophotography |
| JPH02291565A (en) * | 1989-05-02 | 1990-12-03 | Canon Inc | Magenta developer for full-color electrophotography |
| JPH02293862A (en) * | 1989-05-09 | 1990-12-05 | Canon Inc | Magenta developer for full-color electrophotography |
| JPH02293861A (en) * | 1989-05-09 | 1990-12-05 | Canon Inc | Magenta developer for full-color electrophotography |
| JPH02304458A (en) * | 1989-05-19 | 1990-12-18 | Hitachi Ltd | Electrophotographic device |
| EP0689100A1 (en) | 1994-06-22 | 1995-12-27 | Canon Kabushiki Kaisha | Carrier for electrophotography, two component type developer, and image forming method |
| EP0689102A1 (en) * | 1994-06-22 | 1995-12-27 | Canon Kabushiki Kaisha | Magnetic particles for charging means, and electrophotographic apparatus, process cartridge and image forming method including same |
| US5876893A (en) * | 1996-03-01 | 1999-03-02 | Hitachi Metals, Ltd. | Ferrite carrier, two-component developer and electrostatic imaging method using the developer |
| US5976747A (en) * | 1998-01-08 | 1999-11-02 | Powdertech Co., Ltd. | Ferrite carrier for electrophotographic developer and electrophotographic developer containing the same |
| US6143456A (en) * | 1999-11-24 | 2000-11-07 | Xerox Corporation | Environmentally friendly ferrite carrier core, and developer containing same |
| JP2009244571A (en) * | 2008-03-31 | 2009-10-22 | Mitsui Mining & Smelting Co Ltd | Carrier core material for electrophotographic developer, carrier, and electrophotographic developer using carrier |
| JP2009244570A (en) * | 2008-03-31 | 2009-10-22 | Mitsui Mining & Smelting Co Ltd | Carrier core material for electrophotographic developer, carrier, and electrophotographic developer using carrier |
-
1986
- 1986-06-18 JP JP61140334A patent/JPS62297857A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01223471A (en) * | 1988-03-03 | 1989-09-06 | Canon Inc | Carrier for electrophotography |
| JPH02291565A (en) * | 1989-05-02 | 1990-12-03 | Canon Inc | Magenta developer for full-color electrophotography |
| JPH02293862A (en) * | 1989-05-09 | 1990-12-05 | Canon Inc | Magenta developer for full-color electrophotography |
| JPH02293861A (en) * | 1989-05-09 | 1990-12-05 | Canon Inc | Magenta developer for full-color electrophotography |
| JPH02304458A (en) * | 1989-05-19 | 1990-12-18 | Hitachi Ltd | Electrophotographic device |
| EP0689102A1 (en) * | 1994-06-22 | 1995-12-27 | Canon Kabushiki Kaisha | Magnetic particles for charging means, and electrophotographic apparatus, process cartridge and image forming method including same |
| EP0689100A1 (en) | 1994-06-22 | 1995-12-27 | Canon Kabushiki Kaisha | Carrier for electrophotography, two component type developer, and image forming method |
| US6316156B1 (en) | 1994-06-22 | 2001-11-13 | Canon Kabushiki Kaisha | Carrier for electrophotography, two component type developer, and image forming method |
| US5876893A (en) * | 1996-03-01 | 1999-03-02 | Hitachi Metals, Ltd. | Ferrite carrier, two-component developer and electrostatic imaging method using the developer |
| US5976747A (en) * | 1998-01-08 | 1999-11-02 | Powdertech Co., Ltd. | Ferrite carrier for electrophotographic developer and electrophotographic developer containing the same |
| US6143456A (en) * | 1999-11-24 | 2000-11-07 | Xerox Corporation | Environmentally friendly ferrite carrier core, and developer containing same |
| JP2009244571A (en) * | 2008-03-31 | 2009-10-22 | Mitsui Mining & Smelting Co Ltd | Carrier core material for electrophotographic developer, carrier, and electrophotographic developer using carrier |
| JP2009244570A (en) * | 2008-03-31 | 2009-10-22 | Mitsui Mining & Smelting Co Ltd | Carrier core material for electrophotographic developer, carrier, and electrophotographic developer using carrier |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4623603A (en) | Spherical electrophotographic magnetoplumbite-type hexagonal ferrite carrier powder | |
| US4485162A (en) | Magnetic carrier powder having a wide chargeable range of electric resistance useful for magnetic brush development | |
| EP0086444B1 (en) | Magnetic carrier powder for two-component toner | |
| JPS62297857A (en) | Ferrite carrier for electrophotographic development | |
| JPS58123548A (en) | Electrophotographic developing carrier | |
| JPH0559423B2 (en) | ||
| JPS63184764A (en) | Carrier for electrophotographic developer and production thereof | |
| EP1840660A2 (en) | Ferromagnetic material powder, carrier for electrophotographic developer, process for producing them and electrophotographic developer | |
| JPS58123550A (en) | Electrophotographic developing carrier | |
| JPS58123552A (en) | Electrophotographic developing carrier | |
| JPS6231864A (en) | Ferrite carrier for electrophotographic development | |
| JPH0720658A (en) | Method for regulating electrostatic resistance of carrier for electrophotographic development | |
| JPS62297856A (en) | Ferrite carrier for electrophotographic development | |
| JPS59228664A (en) | Ferrite carrier for development in electrophotography | |
| JPS59111926A (en) | Ferrite carrier for electrophotography | |
| JPS58123555A (en) | Electrophotographic developing carrier | |
| JPS60147749A (en) | Ferrite carrier for electrophotography | |
| JPH0358109B2 (en) | ||
| JPS6238698B2 (en) | ||
| JPH0352623B2 (en) | ||
| JPS58123551A (en) | Electrophotographic developing carrier | |
| JPS58123554A (en) | Electrophotographic developing carrier | |
| JPH0764322A (en) | Magnetic toner | |
| JPH10125524A (en) | Oxide magnetic material and carrier using the material | |
| JPS59111156A (en) | Electrophotographic ferrite carrier |