JPS62182758A - Ferrite carrier - Google Patents
Ferrite carrierInfo
- Publication number
- JPS62182758A JPS62182758A JP60299374A JP29937485A JPS62182758A JP S62182758 A JPS62182758 A JP S62182758A JP 60299374 A JP60299374 A JP 60299374A JP 29937485 A JP29937485 A JP 29937485A JP S62182758 A JPS62182758 A JP S62182758A
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- ferrite
- particle size
- titled
- resistance
- 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
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 25
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 6
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 6
- 230000001747 exhibiting effect Effects 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 239000000969 carrier Substances 0.000 abstract description 17
- 239000000203 mixture Substances 0.000 abstract description 16
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 5
- 150000004706 metal oxides Chemical class 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 15
- 239000011701 zinc Substances 0.000 description 9
- 235000013980 iron oxide Nutrition 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 108091008695 photoreceptors Proteins 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000012298 atmosphere Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 239000012050 conventional carrier Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 229910017706 MgZn Inorganic materials 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000002250 progressing 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
- 239000002689 soil Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000001694 spray drying 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】
［技術分野〕
本発明は電子写真法、静電記録法あるいは静電印刷法等
に使用される静電荷像現像剤用キャリアに関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a carrier for an electrostatic image developer used in electrophotography, electrostatic recording, electrostatic printing, or the like.
［従来の技術］
酸化亜鉛、セレン、有機光導電体等の画像担体表面に形
成された静電荷像を磁気ブラシ法により可視像化するた
めの現像剤としては、磁性キャリアとトナーからなる二
成分系現像剤が従来から使用されている。二成分系現像
剤を用いる磁気ブラシ法は、キャリアとトナーを所定の
比率で混合し、両者を摩擦帯電せしめて、所定の延性に
帯電したトナーのみを画像担体表面に付着させて現像が
行われる。[Prior Art] As a developer for visualizing an electrostatic charge image formed on the surface of an image carrier such as zinc oxide, selenium, or an organic photoconductor by a magnetic brush method, a developer consisting of a magnetic carrier and a toner is used. Component-based developers have traditionally been used. In the magnetic brush method using a two-component developer, development is performed by mixing carrier and toner at a predetermined ratio, triboelectrically charging both, and causing only the toner charged to a predetermined ductility to adhere to the surface of the image carrier. .
磁性キャリアとしては鉄粉キャリアが多く使用されてお
り、キャリアの疲労防止および摩擦帯電特性の安定化の
ために通常は表面に酸化処理を施し、更に樹脂で被覆す
ることも行われている。Iron powder carriers are often used as magnetic carriers, and their surfaces are usually oxidized and coated with resin in order to prevent carrier fatigue and stabilize triboelectric charging characteristics.
しかして最近では、酸化鉄粉キャリアに較へて化学的に
安定であり、また使用中の抵抗変化が少なく、更に見掛
密度が鉄粉の約２７３である等の利点を有するフェライ
トキャリアが注目され、実用化が進んでいる。However, recently, ferrite carriers have attracted attention as they have advantages such as being chemically stable compared to iron oxide powder carriers, exhibiting less resistance change during use, and having an apparent density of about 273 compared to iron powder carriers. and its practical application is progressing.
このフェライトキャリアは適当な金属酸化物と鉄酸化物
との完全混合物より構成され、Ｎｉ、Ｚｎ、 Ｍｎ、
Ｍｇ、 Ｃｕ、 Ｌｉ、 Ｂａ、 ■、 Ｃｒ。This ferrite carrier is composed of a complete mixture of suitable metal oxides and iron oxides, including Ni, Zn, Mn,
Mg, Cu, Li, Ba, ■, Cr.
Ｃａ等の酸化物と３価の鉄酸化物との焼結体である。It is a sintered body of an oxide such as Ca and a trivalent iron oxide.
フェライトキャリアとしては種々の組成のものが知られ
ているが、例えば特公昭５３−１５０４０号公報及び特
公昭５６−５２３０５号公報に記載されているようなＮ
ｉ−Ｚｎ系フェライトあるいはＭ ｎ −Ｚ ｎ系フェ
ライトが一般的であった。Ferrite carriers with various compositions are known, but for example, N ferrite carriers as described in Japanese Patent Publication No. 15040/1982 and Japanese Patent Publication No. 52305/1982 are known.
i-Zn ferrite or Mn-Zn ferrite was common.
これに対して最近では、画質の向上が望まれるようにな
ったので、磁気特性、電気特性及び表面状態などの点か
ら、ＭｇＺｎ系フェライトからなるキャリアが使用され
つつある。このフェライトキャリアは例えば特開昭５８
−１４５６２１号、同６０−１３４２４９号、同６０−
１３５９５８号に開示されている。On the other hand, recently, as improved image quality has become desired, carriers made of MgZn-based ferrite are being used from the viewpoint of magnetic properties, electrical properties, and surface conditions. This ferrite carrier is, for example, JP-A-58
-145621, 60-134249, 60-
No. 135958.
［発明が解決しようとする問題点］
しかしながら、従来のＭ ｇ −Ｚ ｎフェライトキャ
リアには次のような問題点が有り、未だ改善の余地が残
されていた。従来は、磁気特性の点から鉄酸化物（Ｆｅ
２０．）の量を多くすると、表面が平滑でなくなるので
、鉄酸化物の量をおさえて。[Problems to be Solved by the Invention] However, the conventional Mg-Zn ferrite carrier has the following problems, and there is still room for improvement. Conventionally, iron oxide (Fe
20. ) If the amount of iron oxide is increased, the surface will not be smooth, so keep the amount of iron oxide in check.
ＣｕＯもしくはＮｉＯを添加することが行われていた。Addition of CuO or NiO has been practiced.
しかるにそのような添加物を入れても画質を含めた総合
特性は必ずしも満足すべきものでなく、しかも経済性の
点で不利となるという問題があった。However, even if such additives are added, the overall characteristics including image quality are not necessarily satisfactory, and there is a problem in that it is disadvantageous in terms of economy.
したがって本発明の目的は、従来よりも画像特性、磁気
特性および表面状態が改善されたフェライトキャリアを
提供することである。Therefore, an object of the present invention is to provide a ferrite carrier that has improved image properties, magnetic properties, and surface condition compared to conventional carriers.
［問題点を解決するための手段］
本発明のフェライトキャリアは、次式
％式％）
［但し、ＭはＭｇとＺｎの組合せ、６０＜ｘ＜６５モル
％］
で示される組成を有し、かつＭｇおよびＺｎ以外の不純
物金属酸化物が合計で０．５モル％以下である実質的に
球状のフェライト粒子からなる共に。[Means for Solving the Problems] The ferrite carrier of the present invention has a composition represented by the following formula (% formula %) [where M is a combination of Mg and Zn, 60<x<65 mol%], and substantially spherical ferrite particles containing impurity metal oxides other than Mg and Zn in a total amount of 0.5 mol % or less.
電気抵抗がＩ Ｘ １０５〜Ｉ Ｘ １０１０Ω・ａｍ
の範囲にあり。Electrical resistance is I x 105 to I x 1010 Ω・am
within the range of
かつ、粒度が２０〜２００μｍの範囲にあることを特徴
とするものである。Moreover, it is characterized in that the particle size is in the range of 20 to 200 μm.
本発明のフェライトキャリアは、結晶学的にはスピネル
型構造を有するものであり、具体的な組成としてはＭｇ
とＺｎの酸化物と鉄酸化物（Ｆｅ２０、）からなってい
る。このような組成においては、磁気特性はＦｅ２Ｏ，
の量に比例し、Ｆｅ２Ｏ。The ferrite carrier of the present invention has a crystallographic spinel structure, and its specific composition is Mg.
It consists of Zn oxide and iron oxide (Fe20). In such a composition, the magnetic properties are Fe2O,
proportional to the amount of Fe2O.
が６０モル％未満では飽和磁化（σＳ）が６０ｅｍｕ／
ｇ以下になる。一般にσＳが６０ｅｍｕ／ｇより少ない
と、磁気ブラシからキャリアが離脱し易くなり、感光体
表面への付着を招いてしまう。一方Ｆｅ２Ｏ，が６５モ
ル％を越えると、σＳが７０ｅｍｕ／ｇより大きくなり
、搬送力が強すぎてトナーの変形等を招き、又磁気ブラ
シの穂が硬くなり、中間調の再現性が低下する。従って
Ｆｅ、０３は６０モル％より大きく、かつ、６５モル％
より少ない範囲とする必要がある。またＭｇＯ及びＺｎ
Ｏの址は、Ｆｅ２Ｏ，と同様に磁気○が１０〜２０モル
％でかつ、ＭｇＯがＺｎＯより３〜５モル％多いことが
望ましい。is less than 60 mol%, the saturation magnetization (σS) is 60 emu/
It becomes less than g. Generally, when σS is less than 60 emu/g, carriers tend to separate from the magnetic brush, resulting in adhesion to the surface of the photoreceptor. On the other hand, when Fe2O exceeds 65 mol%, σS becomes larger than 70 emu/g, the conveying force is too strong, leading to deformation of the toner, and the ears of the magnetic brush become hard, reducing the reproducibility of halftones. . Therefore, Fe, 03 is greater than 60 mol% and 65 mol%
The range needs to be smaller. Also, MgO and Zn
As for the content of O, it is desirable that the magnetic ◯ is 10 to 20 mol %, similar to Fe2O, and that the amount of MgO is 3 to 5 mol % greater than that of ZnO.
フェライトキャリアに要求される特性としては、上記の
磁気特性の他に電気抵抗ならびに粒子形態が挙げられる
。Properties required of the ferrite carrier include electrical resistance and particle morphology in addition to the above-mentioned magnetic properties.
電気抵抗は、キャリアの使用条件（例えば感光体の種類
、現像速度）によってその範囲が定められるが、一般に
低すぎるとキャリア付着が生じ。The range of electrical resistance is determined by the conditions of use of the carrier (eg, type of photoreceptor, development speed), but in general, if it is too low, carrier adhesion occurs.
一方高すぎるとエッチ効果が強まり、ベタ具現像濃度が
不均一となるのでＩ Ｘ １０’〜Ｉ Ｘ １０１０Ω
・Ｃｍの範囲にする必要がある。キャリアの抵抗は、キ
ャリアの組成によっても多少は変化するが、むしろ製造
条件によって大きく変るので、′！Ｘｉ造条件（例えば
焼結雰囲気）によって調節すればよい。On the other hand, if it is too high, the etch effect will become stronger and the solid development density will become uneven, so I
- Must be within the range of Cm. The resistance of the carrier varies somewhat depending on the composition of the carrier, but it varies greatly depending on the manufacturing conditions, so '! It may be adjusted depending on the Xi forming conditions (for example, sintering atmosphere).
キャリアの粒子の電気抵抗、表面状態及び粒子形状なら
びに粒径によって、流動性、帯電特性等の特性が変化し
、画質に影響を与える。まずキャリア粒子の表面状態は
その組成に影響されるが、本発明のキャリアは上述した
組成を有するので、比較的滑らかな表面となり、感光体
への付着及び感光体の損傷という問題は生じない。次に
粒子形状としては、流動性の点から実質的に球形化した
粒子とする必要がある。そして粒度分布は、２０〜２０
０μｍの範囲にすることが必要である。粒径が小り゛。Characteristics such as fluidity and charging characteristics change depending on the electrical resistance, surface condition, particle shape, and particle size of carrier particles, which affect image quality. First, the surface state of carrier particles is affected by its composition, but since the carrier of the present invention has the above-mentioned composition, it has a relatively smooth surface, and problems such as adhesion to the photoreceptor and damage to the photoreceptor do not occur. Next, the particle shape needs to be substantially spherical from the viewpoint of fluidity. And the particle size distribution is 20-20
It is necessary to keep it in the range of 0 μm. Particle size is small.
粒子は３０重量％以下がよい。一方１粒径Ｐ！２００μ
ｍより大きい粒子が多いと画像濃度が低下するので、２
００μｍより大きい粒子は２０重量％以下がよい。The amount of particles is preferably 30% by weight or less. On the other hand, 1 grain size P! 200μ
If there are many particles larger than m, the image density will decrease, so 2
The amount of particles larger than 00 μm is preferably 20% by weight or less.
本発明のフェライトキャリアは１例えば次のような方法
によって製造することができる。The ferrite carrier of the present invention can be manufactured, for example, by the following method.
最初に、所定の金属酸化物と酸化鉄（Ｆｅ、０３）を所
定量秤量し、混合する。次に得られた混合物を８００〜
１０００℃の範囲の温度で数時間仮焼し、しかる後数μ
ｍ以下の粒径に粉砕する。得られた粉砕粉は、必要に応
じ粘結剤を加えてから、加熱雰囲気中で噴霧乾燥して造
粒する。得られた球状粒子は１１００〜１３００℃の温
度で焼結し１次いで解砕及び分級を行ってフェライトキ
ャリアが得られる。First, a predetermined amount of a predetermined metal oxide and iron oxide (Fe, 03) are weighed and mixed. Next, the obtained mixture was heated to 800~
Calcined at a temperature in the range of 1000℃ for several hours, then several μ
Grind to a particle size of m or less. The obtained pulverized powder is granulated by spray drying in a heated atmosphere, after adding a binder if necessary. The obtained spherical particles are sintered at a temperature of 1100 to 1300°C, and then crushed and classified to obtain a ferrite carrier.
ここで焼結を大気中で行うと、キャリアの抵抗は１０８
〜１０１０Ω・ｍになり、窒素雰囲気中で行うとキャリ
アの抵抗は１０５Ω・ｍ程度になる。このほか、適当な
熱処理を行うことによってもキャリアの抵抗は調整でき
る。If sintering is performed in the atmosphere, the resistance of the carrier is 108
~1010 Ω·m, and when carried out in a nitrogen atmosphere, the carrier resistance becomes about 10 5 Ω·m. In addition, the resistance of the carrier can be adjusted by performing appropriate heat treatment.
本発明のフェライトキャリアはトナーと共に混合して現
像剤とされる。トナーとしては公知の１〜ナ一組成物（
例えば特開昭５８−１５０９５７号、同５８−１５０９
５８号、同５８−１９６５４９号、同５７−６０３４１
号、同５７−６０３４２号）が使用でき、また磁性トナ
ーであってもよい。The ferrite carrier of the present invention is mixed with a toner to form a developer. As a toner, publicly known compositions 1 to 1 (
For example, JP-A-58-150957, JP-A No. 58-1509
No. 58, No. 58-196549, No. 57-60341
No. 57-60342) can be used, and magnetic toners may also be used.
本発明のフェライトキャリアの体積固有抵抗は、ダイア
ルゲージを改良したテフロン（商品名）製シリンダー（
内径３．０５＋ｎ＋ｕφ）中に試料を数１０ｍｇ充填し
、１ 、０ ｋ ｇの荷重下、２００Ｖ／ｃｍの直流電
場で抵抗をａｔｑ定し、算出される。The volume resistivity of the ferrite carrier of the present invention is determined by the Teflon (trade name) cylinder (trade name) with an improved dial gauge.
It is calculated by filling several tens of mg of the sample into a tube (with an inner diameter of 3.05+n+uφ) and determining the resistance atq under a load of 1.0 kg and a DC electric field of 200 V/cm.
また、本発明のフェライトキャリアの磁気特性は、振動
試料型磁力計（東英工業製ＶＳＭ−３型）を用いて測定
した値である。Moreover, the magnetic properties of the ferrite carrier of the present invention are values measured using a vibrating sample magnetometer (Model VSM-3 manufactured by Toei Kogyo).
実施例ｌ
Ｍｇ０２１モル％、Ｚｎ０１８モル％、Ｆｅ２Ｏ，６１
モル％となるように各原料を秤量し、ボールミルで乾式
混合した。得られた混合粉を９００℃の温度で２時間仮
焼し１次いで仮焼粉をボールミルに投入して１μｍ以下
の粒子に粉砕した。得られた粉砕粉に粘結剤を加えて造
粒乾燥し、しかる後大気中で１３００℃の温度で４時間
焼結し、更に解砕及び分級した粒径６３〜１２５μｍの
フェライトキャリアを得た。このフェライトキャリアの
σＳは６３ｅｍｕ／ｇ、抵抗は３ＸＩＯ’Ω・ｃｍであ
った。Example 1 Mg021 mol%, Zn018 mol%, Fe2O,61
Each raw material was weighed so as to be in mol% and dry mixed in a ball mill. The obtained mixed powder was calcined at a temperature of 900° C. for 2 hours, and then the calcined powder was put into a ball mill and pulverized into particles of 1 μm or less. A binder was added to the obtained crushed powder, which was granulated and dried, and then sintered in the air at a temperature of 1300°C for 4 hours, and further crushed and classified to obtain a ferrite carrier with a particle size of 63 to 125 μm. . The σS of this ferrite carrier was 63 emu/g, and the resistance was 3XIO'Ω·cm.
実施例２〜５
原料の組成比を変えた以外は実施例１と略同様の条件で
４種類のフェライトキャリアを製造した。Examples 2 to 5 Four types of ferrite carriers were produced under substantially the same conditions as in Example 1 except that the composition ratio of the raw materials was changed.
これらのフェライトキャリアの特性を表１に示す。Table 1 shows the characteristics of these ferrite carriers.
比較例１〜３
原料の酸合比を変えた以外は実施例１と略同様の条件で
３種類のフェライトキャリアを製造した。Comparative Examples 1 to 3 Three types of ferrite carriers were produced under substantially the same conditions as in Example 1, except that the acidification ratio of the raw materials was changed.
これらのフェライトキャリアの特性も同じく表１に示す
。The characteristics of these ferrite carriers are also shown in Table 1.
（以下余白） 表１ （注）組成は分析値である。(Margin below) Table 1 (Note) Composition is an analytical value.
上記フェライトキャリアを用いて、トナー濃度３％にて
現像剤を調整し、市販の電子写真複写機（小西六社製Ｕ
−Ｂ Ｉ Ｘ３０００機）にて作像した。Using the above ferrite carrier, a developer was adjusted to a toner concentration of 3%, and a commercially available electrophotographic copying machine (U manufactured by Konishirokusha Co., Ltd.) was used.
- The image was created using a B IX3000 machine).
得られた画像の評価結果を表２に示す。Table 2 shows the evaluation results of the obtained images.
（以下余白）
表２から、実施例１〜５のフェライトキャリアを使用し
た場合、濃度〆１．３以上で、地力ブリがなく、解像度
が６本／ｍｍでしかも中間調の再現性も良好な画像が得
られることがわかる。これに対して比較例１及び２のフ
ェライトキャリアは、σＳが低いため地力ブリが生し、
比較例３のフェライトキャリアはσＳが高いため、磁気
ブラシが硬くなり、中間調の再現性が劣ることがわかる
。(Margin below) From Table 2, when the ferrite carriers of Examples 1 to 5 were used, the density was 1.3 or higher, there was no ground blur, the resolution was 6 lines/mm, and the reproducibility of intermediate tones was also good. It can be seen that an image is obtained. On the other hand, the ferrite carriers of Comparative Examples 1 and 2 have a low σS and therefore suffer from soil burr.
It can be seen that since the ferrite carrier of Comparative Example 3 has a high σS, the magnetic brush becomes hard and the reproducibility of halftones is poor.
比較例４〜７
純度の異なるＭｇＯ、Ｚｎ○およびＦ ｅ２０．それぞ
れ２１．１８および６１モル％と実施例１と同一組成で
製造し、表３に示す物性を得た。Comparative Examples 4 to 7 MgO, Zn○ and Fe20. with different purity. They were produced with the same compositions as in Example 1, with 21.18 and 61 mol%, respectively, and the physical properties shown in Table 3 were obtained.
（以下余白）
」１記キャリアを用いて眞記実施例と同様に画像評価を
行ったところ比較例４〜７のキャリアにおいては、いず
れも画像濃度が１．３未満で画像に先端欠けがあり、十
分な印字品質を得ることはできなかった。(Left below) Image evaluation was performed in the same manner as in the Makki Example using the carrier described in 1. In the carriers of Comparative Examples 4 to 7, the image density was less than 1.3 and the image had chipping at the leading edge. However, it was not possible to obtain sufficient print quality.
［発明の効果コ
以上に記述の如く、本発明のフェライトキャリアは、特
定の組成と物性を有するからして、従来のものより高品
質の画像を得ることができる。[Effects of the Invention] As described above, since the ferrite carrier of the present invention has a specific composition and physical properties, it is possible to obtain images of higher quality than conventional carriers.
Claims (1)
ャリアにおいて、次式 （ＭＯ）＿１＿０＿０＿−＿Ｘ（Ｆｅ＿２Ｏ＿３）＿Ｘ
［但し、ＭはＭｇとＺｎの組合せ、６０＜ｘ＜６５モル
％］ で示される組成を有し、かつＭｇ及びＺｎ以外の不純物
金属酸化物が合計で０．５モル％以下である実質的に球
状のフェライト粒子からなると共に、電気抵抗が１×１
０＾５〜１×１０＾１＾０Ω・ｃｍの範囲にあり、かつ
、粒度が２０〜２００μｍの範囲にあることを特徴とす
るフェライトキャリア。[Claims] 1. In a ferrite carrier made of a ferrite material exhibiting soft magnetism, the following formula (MO)_1_0_0_-_X(Fe_2O_3)_X
[However, M is a combination of Mg and Zn, 60 < It consists of spherical ferrite particles and has an electrical resistance of 1×1.
A ferrite carrier having a particle size in the range of 0^5 to 1 x 10^1^0 Ω·cm and in the range of 20 to 200 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60299374A JPH0685094B2 (en) | 1985-12-28 | 1985-12-28 | Ferrite carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60299374A JPH0685094B2 (en) | 1985-12-28 | 1985-12-28 | Ferrite carrier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62182758A true JPS62182758A (en) | 1987-08-11 |
| JPH0685094B2 JPH0685094B2 (en) | 1994-10-26 |
Family
ID=17871736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60299374A Expired - Lifetime JPH0685094B2 (en) | 1985-12-28 | 1985-12-28 | Ferrite carrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0685094B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010210975A (en) * | 2009-03-11 | 2010-09-24 | Fuji Xerox Co Ltd | Carrier for developing electrostatic charge image and method of producing the same, electrostatic charge image developer, process cartridge, image forming method, and image forming apparatus |
| CN112837879A (en) * | 2019-11-22 | 2021-05-25 | Tdk株式会社 | Soft magnetic alloy thin strip and magnetic component |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58123549A (en) * | 1982-01-19 | 1983-07-22 | Hitachi Metals Ltd | Electrophotographic developing carrier |
| JPS58145621A (en) * | 1982-02-12 | 1983-08-30 | Tdk Corp | Magnetic carrier particle |
| JPS60134249A (en) * | 1983-12-22 | 1985-07-17 | Fuji Elelctrochem Co Ltd | Ferrite carrier material for electrostatic copying |
| JPS60135958A (en) * | 1983-12-23 | 1985-07-19 | Toda Kogyo Corp | Spherical magnetic carrier particles and their manufacture |
-
1985
- 1985-12-28 JP JP60299374A patent/JPH0685094B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58123549A (en) * | 1982-01-19 | 1983-07-22 | Hitachi Metals Ltd | Electrophotographic developing carrier |
| JPS58145621A (en) * | 1982-02-12 | 1983-08-30 | Tdk Corp | Magnetic carrier particle |
| JPS60134249A (en) * | 1983-12-22 | 1985-07-17 | Fuji Elelctrochem Co Ltd | Ferrite carrier material for electrostatic copying |
| JPS60135958A (en) * | 1983-12-23 | 1985-07-19 | Toda Kogyo Corp | Spherical magnetic carrier particles and their manufacture |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010210975A (en) * | 2009-03-11 | 2010-09-24 | Fuji Xerox Co Ltd | Carrier for developing electrostatic charge image and method of producing the same, electrostatic charge image developer, process cartridge, image forming method, and image forming apparatus |
| US9176401B2 (en) | 2009-03-11 | 2015-11-03 | Fuji Xerox Co., Ltd. | Electrostatic image developing carrier, process of making the same, electrostatic image developer, process cartridge, image forming method, and image forming apparatus |
| CN112837879A (en) * | 2019-11-22 | 2021-05-25 | Tdk株式会社 | Soft magnetic alloy thin strip and magnetic component |
| CN112837879B (en) * | 2019-11-22 | 2024-03-19 | Tdk株式会社 | Soft magnetic alloy ribbon and magnetic component |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0685094B2 (en) | 1994-10-26 |
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