JPH06231941A - Magnet roll and its manufacture - Google Patents
Magnet roll and its manufactureInfo
- Publication number
- JPH06231941A JPH06231941A JP3753293A JP3753293A JPH06231941A JP H06231941 A JPH06231941 A JP H06231941A JP 3753293 A JP3753293 A JP 3753293A JP 3753293 A JP3753293 A JP 3753293A JP H06231941 A JPH06231941 A JP H06231941A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- axial direction
- yoke
- magnet roll
- circumferential
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複写機、ファクシミリ
及びレーザープリンター等の電子写真現像装置において
磁気ブラシ現像装置を構成するための多極着磁マグネッ
トロール及びその製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-pole magnetized magnet roll for constituting a magnetic brush developing device in an electrophotographic developing device such as a copying machine, a facsimile and a laser printer, and a manufacturing method thereof.
【０００２】[0002]
【従来の技術】一般に、電子写真現像装置では、マグネ
ットロールの外周に非磁性体の円筒（スリーブ）を同芯
に設けて該スリーブの外周に磁性トナーを吸着する磁気
ブラシを感光ドラムに対面して配設する方式が採用され
ている。2. Description of the Related Art Generally, in an electrophotographic developing apparatus, a non-magnetic cylinder (sleeve) is concentrically provided on the outer circumference of a magnet roll, and a magnetic brush for adsorbing magnetic toner is provided on the outer circumference of the sleeve so as to face the photosensitive drum. The method of arranging is adopted.
【０００３】従来、マグネットロールを用いた磁気ブラ
シ現像方式は、マグネットロールの外周に配された非磁
性体スリーブの表面に磁性トナーを吸引し、潜像が形成
された感光ドラム表面に磁性トナーを付着させながら現
像することは知られている。Conventionally, in the magnetic brush development method using a magnet roll, magnetic toner is attracted to the surface of a non-magnetic sleeve disposed on the outer periphery of the magnet roll, and magnetic toner is applied to the surface of the photosensitive drum on which a latent image is formed. It is known to develop while adhering.
【０００４】その磁気ブラシ現像方法に用いられるマグ
ネットロールは、その表面外周部の円周方向にはＮ極と
Ｓ極を交互に形成し、軸方向には帯状に均一に磁化され
ており、従って相対的に回転するスリーブの表面上の磁
性トナーは該磁力の方向に逆らって軸方向に移動したり
することは生じない。即ち、磁性トナーはスリーブの円
周方向にのみ搬送力を受けるようにマグネットロールの
軸方向に沿った帯状の磁化領域が均一に磁化されてい
る。尚、このような磁極パターンに着磁する装置は、本
出願人も各種提案している。The magnet roll used in the magnetic brush developing method has N poles and S poles alternately formed in the circumferential direction of the outer peripheral portion of the surface thereof, and is magnetized uniformly in a band shape in the axial direction. The magnetic toner on the surface of the relatively rotating sleeve does not move in the axial direction against the direction of the magnetic force. That is, the magnetic toner is uniformly magnetized in the band-shaped magnetized region along the axial direction of the magnet roll so that the magnetic toner receives the conveying force only in the circumferential direction of the sleeve. The present applicant has also proposed various devices for magnetizing such magnetic pole patterns.
【０００５】しかし、このような磁化パターン構造を有
するマグネットロールでは、逆に何らかの外部的要因に
より、一度スリーブ表面の磁性トナー層にむらが生じる
と、トナーボックスから新たに十分量の磁性トナーが供
給されるまでは、そのむらは決して均一化されることは
ない。また、磁性トナーを磁気ブラシの軸方向に移動さ
せる機能がないと、同一画像を連続して現像する時など
使用条件によって部分的に磁性トナーを多く消費される
と、部分的に磁性トナー不足を生じて濃度の分布が不均
一となり、均一な濃度の画像が得られない原因となる。However, in the magnet roll having such a magnetized pattern structure, once the magnetic toner layer on the surface of the sleeve becomes uneven due to some external factor, a sufficient amount of magnetic toner is newly supplied from the toner box. Until then, the unevenness is never evened out. Also, if there is no function to move the magnetic toner in the axial direction of the magnetic brush, if a large amount of the magnetic toner is partially consumed depending on the usage conditions such as when continuously developing the same image, the magnetic toner may be partially insufficient. As a result, the density distribution becomes non-uniform, which causes an image with a uniform density to not be obtained.
【０００６】[0006]
【発明が解決しようとする課題】そこで、このような問
題を解決し、磁性トナーの搬送が均一になるようなマグ
ネットロールを開発するため種々の実験を重ねた結果本
発明に至った。即ち、本発明が前述の状況に鑑み、解決
しようとするところは、磁極の表面磁束密度が十分大き
く且つ磁性トナーを軸方向に移動させる作用に優れたマ
グネットロール及びその製造方法を提供する点にある。Therefore, as a result of various experiments, in order to solve the above problems and develop a magnet roll capable of uniformly conveying the magnetic toner, the present invention has been accomplished. That is, in view of the above situation, the present invention aims to provide a magnet roll having a sufficiently large surface magnetic flux density of a magnetic pole and an excellent action of moving a magnetic toner in an axial direction, and a manufacturing method thereof. is there.
【０００７】[0007]
【課題を解決するための手段】本発明は、前述の課題解
決のために、円柱状磁性体の周面上に、軸方向に連続し
た帯状の磁極を配し且つ円周方向には交互に異極を配し
てなる磁気ブラシ現像装置用のマグネットロールであっ
て、軸方向の表面磁束密度が等間隔に不均一であるマグ
ネットロールを構成した。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention arranges axially continuous strip-shaped magnetic poles on the circumferential surface of a cylindrical magnetic body and alternately in the circumferential direction. A magnet roll for a magnetic brush developing device, in which different poles are arranged, in which the surface magnetic flux density in the axial direction is nonuniform at equal intervals is configured.
【０００８】また、この場合、円周方向に連続する異極
磁極間の境界を略波形に設定してなること、軸方向に連
続した帯状の磁極を、面積が大きく且つ表面磁束密度が
高い主磁極部と面積が小さく且つ表面磁束密度が低い副
磁極部とを交互に連続形成してなることがより好まし
い。Further, in this case, the boundary between the magnetic poles of different poles which are continuous in the circumferential direction is set in a substantially waveform, and the strip-shaped magnetic poles continuous in the axial direction have a large area and a high surface magnetic flux density. More preferably, the magnetic pole portions and the auxiliary magnetic pole portions having a small area and a low surface magnetic flux density are continuously formed alternately.
【０００９】そして、その製造方法については、軸方向
に平行であり且つ円周方向に交互に異極となる櫛歯状ヨ
ーク芯を有するとともに、各ヨーク芯の起磁力が軸方向
に略均一である軸方向着磁ヨークによって、円柱状磁性
体の周面上に多極着磁した後、円周方向に平行であり且
つ軸方向に交互に異極となる複数のヨーク芯を有すると
ともに、各ヨーク芯の起磁力が円周方向に略均一である
円周方向着磁ヨークによって、前記円柱状磁性体の周面
上に多重着磁してなるマグネットロールの製造方法を提
供する。The manufacturing method thereof has comb tooth-shaped yoke cores which are parallel to the axial direction and alternately have different polarities in the circumferential direction, and the magnetomotive forces of the respective yoke cores are substantially uniform in the axial direction. After a plurality of poles are magnetized on the circumferential surface of the cylindrical magnetic body by an axially magnetized yoke, a plurality of yoke cores that are parallel to the circumferential direction and have different poles alternately in the axial direction are provided. Provided is a method for manufacturing a magnet roll in which a circumferential magnetizing yoke having a magnetomotive force of a yoke core substantially uniform in a circumferential direction is multiply magnetized on a peripheral surface of the cylindrical magnetic body.
【００１０】また、円周方向に平行であり且つ軸方向に
交互に異極となる複数のヨーク芯を有するとともに、各
ヨーク芯の起磁力が円周方向に略均一である円周方向着
磁ヨークによって、前記円柱状磁性体の周面上に多極着
磁した後、軸方向に平行であり且つ円周方向に交互に異
極となる櫛歯状ヨーク芯を有するとともに、各ヨーク芯
の起磁力が軸方向に略均一である軸方向着磁ヨークによ
って、円柱状磁性体の周面上に多重着磁してなるマグネ
ットロールの製造方法を提供する。Further, a plurality of yoke cores that are parallel to the circumferential direction and have different polarities alternately in the axial direction are provided, and the magnetomotive force of each yoke core is substantially uniform in the circumferential direction. After having multi-pole magnetized on the peripheral surface of the cylindrical magnetic body by the yoke, it has comb tooth-shaped yoke cores that are parallel to the axial direction and have different poles alternately in the circumferential direction, and Provided is a method of manufacturing a magnet roll in which an axial magnetizing yoke having a magnetomotive force substantially uniform in an axial direction is multiply magnetized on a peripheral surface of a cylindrical magnetic body.
【００１１】ここで、前記軸方向着磁ヨークの起磁力
を、前記円周方向着磁ヨークの起磁力より大きく設定し
てなることが好ましい。Here, it is preferable that the magnetomotive force of the axial magnetizing yoke is set to be larger than the magnetomotive force of the circumferential magnetizing yoke.
【００１２】また、磁場中成形によって円柱状磁性体の
成形と同時にその周面上に、軸方向に連続するととも
に、表面磁束密度が略均一な帯状の磁極を着磁形成し且
つ円周方向には交互に異極を着磁形成した後、円周方向
に平行であり且つ軸方向に交互に異極となる複数のヨー
ク芯を有するとともに、各ヨーク芯の起磁力が円周方向
に略均一である円周方向着磁ヨークによって、前記円柱
状磁性体の周面上に多重着磁してなるマグネットロール
の製造方法を提供する。Simultaneously with the molding of the cylindrical magnetic body by magnetic field molding, a band-shaped magnetic pole which is continuous in the axial direction and has a substantially uniform surface magnetic flux density is magnetized and formed on the circumferential surface in the circumferential direction. Has a plurality of yoke cores that are parallel to the circumferential direction and alternately have different polarities in the axial direction after the different poles are magnetized alternately, and the magnetomotive force of each yoke core is substantially uniform in the circumferential direction. And a method for manufacturing a magnet roll in which the circumferential surface of the cylindrical magnetic body is multiply magnetized by the circumferential magnetizing yoke.
【００１３】更に、軸方向に平行であり且つ円周方向に
交互に異極となる櫛歯状ヨーク芯を有するとともに、各
ヨーク芯の起磁力が軸方向に等間隔に不均一である軸方
向着磁ヨークによって、円柱状磁性体の周面上に多極着
磁してなるマグネットロールの製造方法を提供する。[0013] Furthermore, while having comb tooth-shaped yoke cores that are parallel to the axial direction and have different polarities alternately in the circumferential direction, the magnetomotive forces of the respective yoke cores are non-uniform at equal intervals in the axial direction. Provided is a method for manufacturing a magnet roll, in which a magnetizing yoke is used to magnetize multiple poles on a circumferential surface of a cylindrical magnetic body.
【００１４】[0014]
【作用】以上の如き内容からなる本発明のマグネットロ
ールは、その外周に配された非磁性体スリーブの表面
に、該マグネットロールの磁極の磁気吸引力によって磁
性トナーを吸着し、マグネットロールに対してスリーブ
が相対的回転することによって磁性トナーを搬送し、潜
像が形成された感光ドラム表面に磁性トナーを付着させ
ながら現像する磁気ブラシ現像装置に使用するものであ
るが、マグネットロールの周面上に軸方向の表面磁束密
度が等間隔に不均一である磁極を形成したことにより、
スリーブの表面上で磁性トナーが、マグネットロールと
該スリーブとの相対的回転に伴って軸方向左右に揺動し
ながら感光ドラム側へ搬送されるのである。従って、何
らかの外部的要因によりスリーブ表面上の磁性トナー層
に不均一が生じたとしても、その磁性トナーの軸方向左
右の揺動により磁性トナー層は均一化されるのである。
また、磁性トナーをスリーブ表面上で軸方向左右に揺動
させることにより、磁性トナーの帯電性も向上するので
ある。According to the magnet roll of the present invention having the above-mentioned contents, the magnetic toner is attracted to the surface of the non-magnetic sleeve disposed on the outer periphery of the magnet roll by the magnetic attraction force of the magnetic pole of the magnet roll, and the magnetic roll is attracted to the magnet roll. It is used in a magnetic brush developing device that conveys magnetic toner by relative rotation of the sleeve and develops while attaching magnetic toner to the surface of the photosensitive drum on which the latent image is formed. By forming magnetic poles with non-uniform surface magnetic flux density in the axial direction at equal intervals,
On the surface of the sleeve, the magnetic toner is conveyed to the photosensitive drum side while swinging left and right in the axial direction with the relative rotation of the magnet roll and the sleeve. Therefore, even if the magnetic toner layer on the surface of the sleeve becomes non-uniform due to some external factor, the magnetic toner layer is made uniform by the lateral swing of the magnetic toner.
Further, by swinging the magnetic toner left and right in the axial direction on the surface of the sleeve, the chargeability of the magnetic toner is also improved.
【００１５】[0015]
【実施例】次に添付図面に示した実施例に基づき更に本
発明の詳細を説明する。図１は本発明のマグネットロー
ル１の代表的実施例を示している。このマグネットロー
ル１は、円筒状のボンド磁石等の磁性体にシャフトを全
長にわたって貫設するか若しくは円柱状の磁性体の両端
にシャフトを固定する等によって、磁性体２の両端にシ
ャフト３が突出形成された外観形状を有している。The present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings. FIG. 1 shows a typical embodiment of the magnet roll 1 of the present invention. In this magnet roll 1, the shaft 3 is projected at both ends of the magnetic body 2 by, for example, penetrating the shaft over a magnetic body such as a cylindrical bonded magnet over its entire length or fixing the shaft to both ends of a cylindrical magnetic body. It has the appearance shape formed.
【００１６】そして、前記磁性体２の周面上に、軸方向
に連続した帯状の磁極４，…を配し且つ円周方向には交
互に異極、即ちＮ極とＳ極を配するとともに、各磁極４
の軸方向の表面磁束密度を等間隔に不均一に設定してい
る。具体的には、隣接するＮ極とＳ極の境界５を略波形
に形成して、軸方向に連続した帯状の磁極４を、面積が
大きく且つ表面磁束密度が高い主磁極部６と、面積が小
さく且つ表面磁束密度が低い副磁極部７とを交互に連続
形成し、更に円周方向にはＮ極の主磁極部６とＳ極の副
磁極部７が交互に形成されるとともに、Ｎ極の副磁極部
７とＳ極の主磁極部６が交互に形成され、各磁極４，…
の主磁極部６と副磁極部７は相互に相補的に入り組んだ
磁極パターンとなしている。Along the circumferential surface of the magnetic body 2, band-shaped magnetic poles 4, ... Which are continuous in the axial direction are arranged, and different poles, that is, N poles and S poles are alternately arranged in the circumferential direction. , Each magnetic pole 4
The surface magnetic flux density in the axial direction of is set to be non-uniform at equal intervals. Specifically, the boundary 5 between the adjacent N and S poles is formed into a substantially corrugated shape, and the strip-shaped magnetic pole 4 continuous in the axial direction is provided with a main magnetic pole portion 6 having a large area and a high surface magnetic flux density. And the auxiliary magnetic pole portions 7 having a small surface magnetic flux density are alternately formed continuously. Further, the main magnetic pole portions 6 of N poles and the auxiliary magnetic pole portions 7 of S poles are alternately formed in the circumferential direction, and N The auxiliary magnetic pole portions 7 of the poles and the main magnetic pole portion 6 of the S pole are alternately formed, and the magnetic poles 4, ...
The main magnetic pole portion 6 and the auxiliary magnetic pole portion 7 have a magnetic pole pattern which is intricately complementary to each other.
【００１７】次に、前述のような磁極パターンを有する
マグネットロール１を製造する方法を説明する。Next, a method of manufacturing the magnet roll 1 having the above-mentioned magnetic pole pattern will be described.
【００１８】（第１製造方法）先ず、通常の方法によっ
て、図２及び図３に示すような中央部に円柱状の磁性体
２を有し、その両端に同芯状にシャフト３，３を突設し
た形状のロール体１０を製造する。(First Manufacturing Method) First, according to a usual method, a cylindrical magnetic body 2 is provided in the central portion as shown in FIGS. 2 and 3, and shafts 3 are concentrically formed at both ends thereof. The roll body 10 having a protruding shape is manufactured.
【００１９】次に、軸方向に平行であり且つ円周方向に
交互に異極となる櫛歯状ヨーク芯を有するとともに、各
ヨーク芯の起磁力が軸方向に略均一である図示しない公
知の軸方向着磁ヨークによって、円柱状磁性体２の周面
上に多極着磁する。この状態の磁極パターンは、従来の
マグネットロールと同じものである。即ち、図２及び図
４に示すように、軸方向に連続した短冊状の磁極４が、
円周方向に多数平行に形成された磁気パターンが形成さ
れ、円周方向の磁極４，…はＮ極とＳ極とを交互に配設
したものである。尚、図４は、図２の磁性体２の部分を
展開して示したものであり、図中Ｘ，Ｘは連続してい
る。Next, a known comb-shaped yoke core, which is parallel to the axial direction and has different polarities in the circumferential direction, is provided, and the magnetomotive force of each yoke core is substantially uniform in the axial direction, which is not shown. Multi-pole magnetization is performed on the circumferential surface of the cylindrical magnetic body 2 by the axial magnetization yoke. The magnetic pole pattern in this state is the same as that of the conventional magnet roll. That is, as shown in FIGS. 2 and 4, the strip-shaped magnetic pole 4 continuous in the axial direction is
A large number of magnetic patterns are formed in parallel with each other in the circumferential direction, and the magnetic poles 4, ... In the circumferential direction are N poles and S poles arranged alternately. Note that FIG. 4 is a developed view of the magnetic body 2 portion of FIG. 2, and X, X in the figure are continuous.
【００２０】最後に、図５に示すように、軸方向と直角
に交わるように等間隔で多極に多重着磁する。即ち、図
５の展開図において円周方向に連続した短冊状にＮ極と
Ｓ極が交互に現れるように磁化し、軸方向と円周方向と
で同極が交叉する部分では表面磁束密度が高くなり、他
方、異極が交叉する部分では表面磁束密度が低くなる。
しかし、軸方向に平行な前記磁極４の磁力が消磁された
り、逆極にならない程度に円周方向の着磁の磁力を設定
する。Finally, as shown in FIG. 5, multiple poles are multiply magnetized at equal intervals so as to intersect at right angles with the axial direction. That is, in the developed view of FIG. 5, the magnets are magnetized so that the N poles and the S poles alternately appear in a strip shape continuous in the circumferential direction, and the surface magnetic flux density is increased in the portion where the same poles intersect in the axial direction and the circumferential direction. On the other hand, the surface magnetic flux density becomes low at the portion where the different poles cross each other.
However, the magnetic force of magnetization in the circumferential direction is set to such an extent that the magnetic force of the magnetic pole 4 parallel to the axial direction is not demagnetized or becomes a reverse pole.
【００２１】こうして、製造されたマグネットロール１
の磁極パターンは、図１及び図６の展開図に示したよう
に、軸方向に連続した磁極４に、面積が大きく且つ表面
磁束密度が高い主磁極部６（Ｎ1 又はＳ1 で示す）と、
面積が小さく且つ表面磁束密度が低い副磁極部７（Ｎ2
又はＳ2 で示す）とが交互に連続形成される。更に、円
周方向にはＮ極の主磁極部６（Ｎ1 ）とＳ極の副磁極部
７（Ｓ2 ）が交互に形成されるとともに、Ｎ極の副磁極
部７（Ｎ2 ）とＳ極の主磁極部６（Ｓ1 ）が交互に形成
され、各磁極４，…の主磁極部６と副磁極部７は相互に
相補的に入り組んだ磁極パターンとなる。また、隣接す
るＮ極とＳ極の境界５は、略波形に形成される。The magnet roll 1 thus manufactured
As shown in the development views of FIGS. 1 and 6, the magnetic pole pattern of the main magnetic pole portion 6 (shown by N 1 or S 1 ) having a large area and a high surface magnetic flux density is formed on the magnetic pole 4 continuous in the axial direction. When,
The auxiliary magnetic pole portion 7 (N 2 having a small area and a low surface magnetic flux density)
Or S 2 ) are alternately and continuously formed. Further, the N-pole main magnetic pole portion 6 (N 1 ) and the S-pole auxiliary magnetic pole portion 7 (S 2 ) are alternately formed in the circumferential direction, and the N-pole auxiliary magnetic pole portion 7 (N 2 ) is formed. The S-pole main magnetic pole portions 6 (S 1 ) are alternately formed, and the main magnetic pole portions 6 and the auxiliary magnetic pole portions 7 of the respective magnetic poles 4, ... Have a magnetic pole pattern in which they are intricately complementary to each other. Further, the boundary 5 between the adjacent N and S poles is formed in a substantially wavy shape.
【００２２】図７は、図６のＮ極の中心におけるＡ−
Ａ′線の表面磁束密度の分布を示したものであり、軸方
向の表面磁束密度が等間隔に不均一になっている。ま
た、図８は、同じく図６のＮ極とＳ極の境界部分におけ
るＢ−Ｂ′線の表面磁束密度の分布を示したものであ
り、軸方向の表面磁束密度が等間隔に不均一であるとと
もに、極性が等間隔に変化している。また、図９は同じ
く図６のＣ−Ｃ′線の表面磁束密度の分布を示したもの
である。FIG. 7 shows A- at the center of the N pole of FIG.
The distribution of the surface magnetic flux density along line A'is shown, in which the surface magnetic flux density in the axial direction is nonuniform at equal intervals. Further, FIG. 8 shows the distribution of the surface magnetic flux density of the BB ′ line at the boundary portion between the N pole and the S pole of FIG. 6 as well, and the surface magnetic flux density in the axial direction is nonuniform at equal intervals. At the same time, the polarity changes at equal intervals. Further, FIG. 9 also shows the distribution of the surface magnetic flux density along the line CC ′ of FIG.
【００２３】ここで、軸方向と直角に交わるように着磁
するための着磁ヨークの一例を図１０に示す。本実施例
の円周方向着磁ヨーク２０は、二つ割りした分割着磁ヨ
ーク２１，２２の互いの接合面側に、前記ロール体１０
の磁性体２の部分を収容する半円筒状の着磁面２３，２
４をそれぞれ形成し、各着磁面２３，２４には円周方向
に平行であり且つ軸方向に交互に異極となる複数のヨー
ク芯２５，２６を有するとともに、各ヨーク芯２５，２
６の起磁力が円周方向に略均一となしたものである。前
記ヨーク芯２５，…又はヨーク芯２６，…は、隣接する
ヨーク芯の間に円周方向に沿った凹溝２７を形成し、該
凹溝２７内に九十九折り状に電線２８を埋設して固定
し、この電線２８に電流を流すことにより軸方向に交互
にＮ極とＳ極が現れるように設定している。この円周方
向着磁ヨーク２０に装着する前のロール体１０には、そ
の磁性体２の周面上に、円周方向に等間隔ピッチで多極
の磁極４，…が着磁形成されている。そして、このロー
ル体１０に円周方向に多重着磁した際に、軸方向に連続
した磁極４が消磁されたり、また逆極にならないよう
に、前述の軸方向着磁ヨークのヨーク芯が発生する起磁
力を、当該円周方向着磁ヨーク２０の電線２８とヨーク
芯２５，２６で構成する電磁石が発生する起磁力より大
きく設定するのである。尚、ヨーク芯そのものを永久磁
石で形成することも可能である。Here, an example of a magnetizing yoke for magnetizing so as to intersect with the axial direction at right angles is shown in FIG. The circumferential magnetizing yoke 20 of the present embodiment is provided with the roll body 10 on the joint surface side of the divided magnetizing yokes 21 and 22 divided into two.
Magnetizing surfaces 23, 2 having a semi-cylindrical shape for accommodating the part of the magnetic body 2
4, each magnetized surface 23, 24 has a plurality of yoke cores 25, 26 that are parallel to the circumferential direction and that have different polarities alternately in the axial direction.
The magnetomotive force of 6 is substantially uniform in the circumferential direction. The yoke cores 25, ... Or the yoke cores 26, ... Form a groove 27 along the circumferential direction between adjacent yoke cores, and an electric wire 28 is embedded in the groove 27 in a 99-fold shape. It is set so that the N pole and the S pole alternately appear in the axial direction by passing a current through the electric wire 28. The roll body 10 before being mounted on the circumferentially magnetized yoke 20 is formed with magnetized multi-pole magnetic poles 4, ... On the circumferential surface of the magnetic body 2 at equal pitches in the circumferential direction. There is. Then, when the roll body 10 is multiply magnetized in the circumferential direction, the above-mentioned yoke core of the axially magnetized yoke is generated so that the magnetic poles 4 continuous in the axial direction are not demagnetized or become reverse poles. The generated magnetomotive force is set to be larger than the magnetomotive force generated by the electromagnet composed of the electric wire 28 and the yoke cores 25 and 26 of the circumferentially magnetized yoke 20. It is also possible to form the yoke core itself with a permanent magnet.
【００２４】（第２製造方法）本製造方法は、前述の第
１製造方法において、軸方向着磁ヨークによってロール
体１０の軸方向に着磁する工程と、前記円周方向着磁ヨ
ーク２０によって円周方向に着磁する工程の順序を逆に
したものである。即ち、先ず円周方向着磁ヨーク２０に
よって、ロール体１０の磁性体２の周面上に、円周方向
には平行であり、軸方向には等間隔に異極を交互に着磁
形成した後、従来の軸方向着磁ヨークによってロール体
１０の磁性体２の周面上に、軸方向に平行であり、円周
方向には等間隔に異極を交互に着磁形成するのである。
この場合も前記同様に、軸方向着磁ヨークの起磁力を、
円周方向着磁ヨーク２０の起磁力より大きく設定する。
従って、軸方向着磁ヨークによって着磁した場合、同極
が交叉する部分では表面磁束密度が高くなり、他方、異
極が交叉する部分では消磁された後、逆極に着磁されそ
の表面磁束密度が低くなり、前記図６に示したものと同
様な磁極パターンが形成される。(Second Manufacturing Method) This manufacturing method is the same as the first manufacturing method described above except that the axial magnetizing yoke is used to magnetize the roll body 10 in the axial direction, and the circumferential magnetizing yoke 20 is used. The order of the steps of magnetizing in the circumferential direction is reversed. That is, first, by the circumferential direction magnetizing yoke 20, different poles are alternately magnetized and formed on the circumferential surface of the magnetic body 2 of the roll body 10 in parallel in the circumferential direction and at equal intervals in the axial direction. After that, different poles, which are parallel to the axial direction and are equally spaced in the circumferential direction, are alternately magnetized on the circumferential surface of the magnetic body 2 of the roll body 10 by the conventional axial magnetization yoke.
In this case as well, the magnetomotive force of the axial magnetization yoke is
It is set to be larger than the magnetomotive force of the circumferential magnetizing yoke 20.
Therefore, when magnetized by the axial magnetizing yoke, the surface magnetic flux density becomes high in the part where the same pole intersects, while it is demagnetized in the part where the different pole intersects and then magnetized to the opposite pole. The density becomes low, and a magnetic pole pattern similar to that shown in FIG. 6 is formed.
【００２５】（第３製造方法）本製造方法は、前述の第
１製造方法において、ロール体１０を製造する際に、磁
場中で成形してその磁性体２の周面上に等間隔ピッチで
軸方向に平行な磁極４，…を同時に形成するものであ
る。従って、前述の軸方向着磁ヨークによる軸方向着磁
工程を省略することができる。この磁場配向成形方法
は、本出願人によっても各種提案されているが、例えば
磁場配向ダイを用いてロール体１０を押出し形成する方
法がある。(Third Manufacturing Method) This manufacturing method is the same as the above-described first manufacturing method, but when the roll body 10 is manufactured, the roll body 10 is molded in a magnetic field at equal intervals on the peripheral surface of the magnetic body 2. The magnetic poles 4, ... Which are parallel to the axial direction are formed at the same time. Therefore, the axial magnetizing step using the axial magnetizing yoke described above can be omitted. Various types of this magnetic field orientation molding method have been proposed by the applicant of the present invention. For example, there is a method of extruding the roll body 10 using a magnetic field orientation die.
【００２６】（第４製造方法）本製造方法は、軸方向に
平行であり且つ円周方向に交互に異極となる櫛歯状ヨー
ク芯を有するとともに、各ヨーク芯の起磁力が軸方向に
等間隔に不均一である軸方向着磁ヨークによって、円柱
状磁性体の周面上に多極着磁するものである。ここで、
起磁力が軸方向に等間隔に不均一であるヨーク芯の構造
としては、軸方向に透磁率が大きい部分と小さい部分を
交互に配する構造や、第１製造方法で使用する軸方向着
磁ヨークの各ヨーク芯に、軸方向に沿って等間隔に永久
磁石を埋設して起磁力を調節する構造等が採用される。(Fourth Manufacturing Method) This manufacturing method has comb tooth-shaped yoke cores which are parallel to the axial direction and have different polarities alternately in the circumferential direction, and the magnetomotive force of each yoke core is axially changed. Multi-pole magnetization is performed on the circumferential surface of the cylindrical magnetic body by the axially magnetizing yokes that are nonuniform at equal intervals. here,
Examples of the yoke core structure in which the magnetomotive forces are non-uniform at equal intervals in the axial direction include a structure in which a portion having a large magnetic permeability and a portion having a small magnetic permeability are alternately arranged, and an axial magnetizing used in the first manufacturing method. A structure in which permanent magnets are embedded at equal intervals along the axial direction in each yoke core of the yoke to adjust the magnetomotive force is adopted.
【００２７】このようにして製造された図１のマグネッ
トロール１は、図１１に示すようにその外周に相対的回
転可能に非磁性体製の円筒からなるスリーブ３０を外装
して、磁気ブラシ現像装置を構成するのである。即ち、
両端が円盤状のフランジ３１，３２で閉止されたスリー
ブ３０内に、マグネットロール１を内挿し、磁性体２の
両端のシャフト３ａ，３ｂを、それぞれ前記フランジ３
１，３２に軸受３３，３４にて回転自在に支持するとと
もに、一方のシャフト３ａは一方のフランジ３１に貫通
状態で軸支し、他方のシャフト３ｂは他方のフランジ３
２の内部に非貫通状態で軸支するとともに、該フランジ
３２の外部には３ｂと同芯となして軸部３５を突設して
構成している。そして、前記シャフト３ａと軸部３５と
をトナーボックスの側壁等に軸支し、スリーブ３０とマ
グネットロール１を互いに回転できるようになしてい
る。通常はマグネットロール１を固定し、スリーブ３０
を図示しない回転駆動手段にて回転させるようにしてい
る。The magnet roll 1 of FIG. 1 manufactured in this manner has a sleeve 30 made of a non-magnetic cylinder rotatably mounted on the outer periphery thereof as shown in FIG. It constitutes the device. That is,
The magnet roll 1 is inserted into a sleeve 30 whose both ends are closed by disk-shaped flanges 31 and 32, and the shafts 3a and 3b at both ends of the magnetic body 2 are attached to the flange 3 respectively.
1, 32 are rotatably supported by bearings 33, 34, one shaft 3a is rotatably supported in one flange 31 in the penetrating state, and the other shaft 3b is in the other flange 3
A shaft portion 35 is axially supported in a non-penetrating state inside 2, and a shaft portion 35 is provided outside the flange 32 so as to be concentric with 3b. The shaft 3a and the shaft portion 35 are pivotally supported on the side wall of the toner box or the like so that the sleeve 30 and the magnet roll 1 can rotate relative to each other. Normally, the magnet roll 1 is fixed and the sleeve 30
Is rotated by a rotation driving means (not shown).
【００２８】次に、図１２及び図１３に基づき本発明の
磁性トナーの軸方向の搬送プロセスを簡単に説明する。
図示しないトナーボックスからマグネットロール１の磁
気吸引力によってスリーブ３０の表面に磁性トナー４０
が吸着し、該スリーブ３０の回転に伴って円周方向に搬
送し、図示しないドクターブレードによってその層厚は
所定の厚みに均一化した後、図示しない感光ドラムに形
成された静電潜像に磁性トナー４０を引き渡し、残った
不用な磁性トナー４０は同様に搬送されてトナーボック
スに回収する。ここで、この円周方向の磁性トナー４０
の搬送は、マグネットロール１の磁性体２に形成された
軸方向に平行であり、円周方向に異極を交互に配した多
極の磁極４，…によって行われる。Next, the axial toner conveying process of the present invention will be briefly described with reference to FIGS. 12 and 13.
The magnetic toner 40 is applied to the surface of the sleeve 30 by a magnetic attraction force of the magnet roll 1 from a toner box (not shown).
Is adsorbed and conveyed in the circumferential direction as the sleeve 30 rotates, and its layer thickness is made uniform to a predetermined thickness by a doctor blade (not shown), and then an electrostatic latent image formed on a photosensitive drum (not shown) is formed. The magnetic toner 40 is delivered, and the remaining unnecessary magnetic toner 40 is similarly conveyed and collected in the toner box. Here, the magnetic toner 40 in the circumferential direction is
Is carried by multi-pole magnetic poles 4, ... Which are parallel to the axial direction formed on the magnetic body 2 of the magnet roll 1 and have different poles alternately arranged in the circumferential direction.
【００２９】ところで、今、図１２に示したように何ら
かの外部的要因によりスリーブ３０の表面の磁性トナー
４０，…の正常層４１に不均一が生じて、図示したよう
に部分的に欠損部４２が生じたとする。前記スリーブ３
０の表面に吸着された磁性トナー４０は、マグネットロ
ール１の磁極４によって磁化され、スリーブ３０の回転
に伴ってマグネットロール１の円周方向に交互に形成さ
れたＮ極とＳ極によって、その磁化の方向が逆転する
が、Ｎ極とＳ極の境界５を通過する瞬間には直前の磁極
４（図１２の例ではＳ極）による残留磁化が生じている
ため、直後の磁極４（図１３の例ではＮ極）に吸引され
て逆極に磁化されるまでの間に若干移動する。この移動
方向は、通常は円周方向のみであるが、本発明のように
磁極４を軸方向に不均一に形成している場合には、表面
磁束密度のより高い部分に吸引されて軸方向にも移動し
て前記欠損部４２を周囲の正常層４１の磁性トナー４０
によって埋め、磁性トナー４０の濃度を軸方向に均一化
するのである。図１３中における黒丸が軸方向に移動し
て欠損部４２を埋めた磁性トナーを示している。尚、通
常の状態における正常層４１はの層厚は十分に厚いの
で、軸方向に多少移動してもその部分に新たな欠損部が
生じることはない。Now, as shown in FIG. 12, the normal layer 41 of the magnetic toner 40, ... On the surface of the sleeve 30 becomes non-uniform due to some external factor, and as shown in FIG. Occurs. The sleeve 3
The magnetic toner 40 adsorbed on the surface of No. 0 is magnetized by the magnetic poles 4 of the magnet roll 1, and is rotated by the N pole and the S pole alternately formed in the circumferential direction of the magnet roll 1 as the sleeve 30 rotates. Although the direction of magnetization is reversed, residual magnetism is generated by the immediately preceding magnetic pole 4 (S pole in the example of FIG. 12) at the moment of passing through the boundary 5 between the N pole and the S pole. In the example of No. 13, it moves slightly before being attracted to the N pole) and magnetized to the opposite pole. This moving direction is usually only in the circumferential direction, but when the magnetic pole 4 is formed non-uniformly in the axial direction as in the present invention, it is attracted to a portion having a higher surface magnetic flux density and is axially moved. To the magnetic toner 40 of the surrounding normal layer 41 by moving to the defect portion 42.
The density of the magnetic toner 40 is uniformed in the axial direction. The black circles in FIG. 13 indicate the magnetic toner that has moved in the axial direction and filled in the defective portion 42. Since the normal layer 41 has a sufficiently large thickness in a normal state, even if the normal layer 41 is slightly moved in the axial direction, a new defect portion does not occur in that portion.
【００３０】更に、本発明ではＮ極とＳ極の境界５を略
波形に設定しているため、該境界５の近傍における軸方
向の表面磁束密度の変化が大きいばかりでなく、軸方向
に異極部分が交互に形成されているので、磁性トナー４
０の軸方向の移動が素早く行われるのである。Further, in the present invention, since the boundary 5 between the N pole and the S pole is set in a substantially waveform, not only the change in the surface magnetic flux density in the axial direction in the vicinity of the boundary 5 is large, but also the difference in the axial direction. Since the pole portions are formed alternately, the magnetic toner 4
The movement of 0 in the axial direction is performed quickly.
【００３１】このように、スリーブ３０の表面に吸着さ
れた磁性トナー４０，…は、該スリーブ３０の回転に伴
って軸方向左右に揺動しながら円周方向に搬送されるの
で、磁性トナー４０，…の正常層４１に欠損部４２が生
じたとしても、軸方向左右に揺動する周囲の磁性トナー
４０，…によって埋められてその層厚が均一化されるの
である。As described above, the magnetic toner 40 adsorbed on the surface of the sleeve 30 is conveyed in the circumferential direction while swinging left and right in the axial direction as the sleeve 30 rotates, so that the magnetic toner 40. Even if the defective portion 42 is formed in the normal layer 41 of, ..., It is filled with the surrounding magnetic toner 40, which swings left and right in the axial direction, and the layer thickness is made uniform.
【００３２】[0032]
【発明の効果】以上にしてなる本発明のマグネットロー
ルは、磁性体の周面上に軸方向の表面磁束密度が等間隔
に不均一である磁極を形成したことにより、スリーブの
表面上に吸着された磁性トナーが、マグネットロールと
該スリーブとの相対的回転に伴って軸方向左右に揺動し
ながら感光ドラム側へ搬送するので、何らかの外部的要
因によりスリーブ表面上の磁性トナー層に不均一が生じ
たとしても、その磁性トナーの軸方向左右の揺動により
磁性トナー層を均一化することができ、もって濃度にむ
らがない高品質の画像が得られる。また、磁性トナーを
スリーブ表面上で軸方向左右に揺動させることにより、
磁性トナーの帯電性も向上し、より高画質化に寄与する
ものである。According to the magnet roll of the present invention as described above, magnetic poles whose surface magnetic flux densities in the axial direction are nonuniform at equal intervals are formed on the peripheral surface of a magnetic body, so that the magnetic roll is attracted to the surface of the sleeve. The generated magnetic toner is conveyed to the photosensitive drum side while swinging left and right in the axial direction according to the relative rotation of the magnet roll and the sleeve, so that it is uneven on the magnetic toner layer on the sleeve surface due to some external factor. Even if such a phenomenon occurs, the magnetic toner layer can be made uniform by swinging the magnetic toner to the left and right in the axial direction, so that a high-quality image having uniform density can be obtained. Also, by swinging the magnetic toner axially left and right on the sleeve surface,
The chargeability of the magnetic toner is also improved, which contributes to higher image quality.
【００３３】更に、円周方向に連続する異極磁極間の境
界を略波形に設定することにより、また軸方向に連続し
た帯状の磁極を、面積が大きく且つ表面磁束密度が高い
主磁極部と面積が小さく且つ表面磁束密度が低い副磁極
部とを交互に連続形成してなることにより、磁性トナー
の軸方向左右の揺動が素早くなり更に高画質化において
優れている。Further, by setting the boundary between the magnetic poles of different poles continuous in the circumferential direction in a substantially waveform, the strip-shaped magnetic poles continuous in the axial direction are used as a main magnetic pole portion having a large area and a high surface magnetic flux density. By alternately and continuously forming the auxiliary magnetic pole portions having a small area and a low surface magnetic flux density, the swinging of the magnetic toner in the left and right directions in the axial direction is swift, which is further excellent in high image quality.
【００３４】また、マグネットロールの製造方法におい
ては、軸方向着磁ヨークと円周方向着磁ヨークによる多
重着磁によって、従来の着磁技術を利用して磁性体の周
面上に軸方向の表面磁束密度が等間隔に不均一である磁
極を極めて容易に形成することができる。Further, in the method of manufacturing the magnet roll, the conventional magnetizing technique is used to effect the axial direction on the circumferential surface of the magnetic body by the multiple magnetization by the axial direction magnetizing yoke and the circumferential direction magnetizing yoke. It is possible to extremely easily form magnetic poles whose surface magnetic flux density is nonuniform at equal intervals.
【００３５】そして、磁場中成形によって円柱状磁性体
の成形と同時にその周面上に軸方向の磁極を多極着磁し
た後、円周方向着磁ヨークによって多重着磁することに
より、製造工程の省略化が可能となり、安価に製造でき
るのである。At the same time as forming the cylindrical magnetic body by magnetic field molding, a magnetic pole in the axial direction is multi-polarized on the peripheral surface of the cylindrical magnetic body, and is then multi-polarized by a circumferential magnetizing yoke, whereby a manufacturing process is performed. Can be omitted and the manufacturing cost can be reduced.
【００３６】更に、軸方向に平行であり且つ円周方向に
交互に異極となる櫛歯状ヨーク芯を有するとともに、各
ヨーク芯の起磁力が軸方向に等間隔に不均一である軸方
向着磁ヨークによって、円柱状磁性体の周面上に多極着
磁してなることにより、１工程の着磁作業によって磁性
体の周面上に軸方向の表面磁束密度が等間隔に不均一で
ある磁極を形成することができる。Furthermore, while having comb tooth-shaped yoke cores that are parallel to the axial direction and have different polarities alternately in the circumferential direction, the magnetomotive forces of the respective yoke cores are nonuniform at equal intervals in the axial direction. Multi-pole magnetization is performed on the peripheral surface of the cylindrical magnetic body by the magnetizing yoke, so that the surface magnetic flux density in the axial direction is nonuniform at equal intervals on the peripheral surface of the magnetic body by one step of magnetizing work. Can be formed.
【図１】本発明のマグネットロールの一部省略斜視図で
ある。FIG. 1 is a partially omitted perspective view of a magnet roll of the present invention.
【図２】本発明のマグネットロールの製造過程で作られ
るロール体の一部省略斜視図である。FIG. 2 is a partially omitted perspective view of a roll body manufactured in the process of manufacturing the magnet roll of the present invention.
【図３】同じく側面図である。FIG. 3 is a side view of the same.
【図４】図２の磁性体部分の表面展開図である。FIG. 4 is a surface development view of a magnetic body portion of FIG.
【図５】円周方向に多重着磁した磁性体部分の概念的な
表面展開図である。FIG. 5 is a conceptual surface development view of a magnetic body portion that is multiply magnetized in the circumferential direction.
【図６】多重着磁後の磁性体部分の表面展開図である。FIG. 6 is a surface development view of a magnetic body portion after multiple magnetization.
【図７】図６のＡ−Ａ′線の表面磁束密度の分布図であ
る。7 is a distribution diagram of the surface magnetic flux density along the line AA ′ in FIG.
【図８】図６のＢ−Ｂ′線の表面磁束密度の分布図であ
る。8 is a distribution diagram of the surface magnetic flux density along the line BB ′ in FIG.
【図９】図６のＣ−Ｃ′線の表面磁束密度の分布図であ
る。FIG. 9 is a distribution diagram of the surface magnetic flux density of the CC ′ line in FIG. 6.
【図10】円周方向着磁ヨークを示す簡略斜視図である。FIG. 10 is a simplified perspective view showing a circumferential magnetizing yoke.
【図11】マグネットロールの外周にスリーブを装着した
状態の簡略断面図である。FIG. 11 is a simplified cross-sectional view of a state in which a sleeve is attached to the outer circumference of the magnet roll.
【図12】スリーブの表面上の磁性トナー層に欠損部が生
じた状態を概念的に示した要部断面図である。FIG. 12 is a cross-sectional view of an essential part conceptually showing a state in which a defective portion is formed in the magnetic toner layer on the surface of the sleeve.
【図13】図１２の欠損部が周囲の磁性トナーによって埋
まった状態を概念的に示した要部断面図である。FIG. 13 is a cross-sectional view of an essential part conceptually showing a state in which the defective portion of FIG. 12 is filled with the surrounding magnetic toner.
１ マグネットロール ２ 磁性体 ３，３ａ，３ｂ シャフト ４ 磁極 ５ 境界 ６，Ｎ1 ，Ｓ1 主磁極部 ７，Ｎ2 ，Ｓ2 副磁極部 １０ ロール体 ２０ 円周方向着磁ヨーク ２１，２２ 分割着磁ヨーク ２３，２４ 着磁面 ２５，２６ ヨーク芯 ２７ 凹溝 ２８ 電線 ３０ スリーブ ３１，３２ フランジ ３３，３４ 軸受 ３５ 軸部 ４０ 磁性トナー ４１ 正常層 ４２ 欠損部1 Magnet Roll 2 Magnetic Material 3, 3a, 3b Shaft 4 Magnetic Pole 5 Boundary 6, N 1 , S 1 Main Magnetic Pole 7, N 2 , S 2 Sub Magnetic Pole 10 Roll Body 20 Circumferential Magnetization Yoke 21, 22 Split Magnetizing yoke 23,24 Magnetizing surface 25,26 Yoke core 27 Recessed groove 28 Electric wire 30 Sleeve 31, 32 Flange 33,34 Bearing 35 Shaft 40 Magnetic toner 41 Normal layer 42 Missing portion
Claims (8)
した帯状の磁極を配し且つ円周方向には交互に異極を配
してなる磁気ブラシ現像装置用のマグネットロールであ
って、軸方向の表面磁束密度が等間隔に不均一であるこ
とを特徴とするマグネットロール。1. A magnet roll for use in a magnetic brush developing device, wherein strip-shaped magnetic poles continuous in the axial direction are arranged on the peripheral surface of a cylindrical magnetic body, and different poles are arranged alternately in the circumferential direction. The magnet roll is characterized in that the surface magnetic flux density in the axial direction is nonuniform at equal intervals.
略波形に設定してなる請求項１記載のマグネットロー
ル。2. The magnet roll according to claim 1, wherein a boundary between magnetic poles of different poles which are continuous in the circumferential direction is set to have a substantially wavy shape.
大きく且つ表面磁束密度が高い主磁極部と面積が小さく
且つ表面磁束密度が低い副磁極部とを交互に連続形成し
てなる請求項１又は２記載のマグネットロール。3. A belt-shaped magnetic pole continuous in the axial direction is formed by alternately forming a main magnetic pole portion having a large area and a high surface magnetic flux density and a sub magnetic pole portion having a small area and a low surface magnetic flux density. Item 1. The magnet roll according to Item 1 or 2.
に異極となる櫛歯状ヨーク芯を有するとともに、各ヨー
ク芯の起磁力が軸方向に略均一である軸方向着磁ヨーク
によって、円柱状磁性体の周面上に多極着磁した後、円
周方向に平行であり且つ軸方向に交互に異極となる複数
のヨーク芯を有するとともに、各ヨーク芯の起磁力が円
周方向に略均一である円周方向着磁ヨークによって、前
記円柱状磁性体の周面上に多重着磁してなることを特徴
とするマグネットロールの製造方法。4. An axial magnetizing yoke having comb tooth-shaped yoke cores that are parallel to the axial direction and have different polarities alternately in the circumferential direction, and the magnetomotive forces of the respective yoke cores are substantially uniform in the axial direction. After having magnetized multiple poles on the circumferential surface of the cylindrical magnetic body, it has a plurality of yoke cores that are parallel to the circumferential direction and have different poles alternately in the axial direction, and the magnetomotive force of each yoke core is A method of manufacturing a magnet roll, characterized in that a circumferential magnetizing yoke, which is substantially uniform in the circumferential direction, is multiply magnetized on the circumferential surface of the cylindrical magnetic body.
に異極となる複数のヨーク芯を有するとともに、各ヨー
ク芯の起磁力が円周方向に略均一である円周方向着磁ヨ
ークによって、前記円柱状磁性体の周面上に多極着磁し
た後、軸方向に平行であり且つ円周方向に交互に異極と
なる櫛歯状ヨーク芯を有するとともに、各ヨーク芯の起
磁力が軸方向に略均一である軸方向着磁ヨークによっ
て、円柱状磁性体の周面上に多重着磁してなることを特
徴とするマグネットロールの製造方法。5. A circumferentially magnetized magnet having a plurality of yoke cores parallel to the circumferential direction and having different polarities alternately in the axial direction, and the magnetomotive forces of the respective yoke cores being substantially uniform in the circumferential direction. After having multi-pole magnetized on the peripheral surface of the cylindrical magnetic body by the yoke, it has comb tooth-shaped yoke cores that are parallel to the axial direction and have different poles alternately in the circumferential direction, and A method of manufacturing a magnet roll, wherein the magnetizing force is multiply magnetized on the peripheral surface of a cylindrical magnetic body by an axial magnetizing yoke having a magnetomotive force substantially uniform in the axial direction.
円周方向着磁ヨークの起磁力より大きく設定してなる請
求項４又は５記載のマグネットロールの製造方法。6. The method of manufacturing a magnet roll according to claim 4, wherein the magnetomotive force of the axial magnetizing yoke is set to be larger than the magnetomotive force of the circumferential magnetizing yoke.
と同時にその周面上に、軸方向に連続するとともに、表
面磁束密度が略均一な帯状の磁極を着磁形成し且つ円周
方向には交互に異極を着磁形成した後、円周方向に平行
であり且つ軸方向に交互に異極となる複数のヨーク芯を
有するとともに、各ヨーク芯の起磁力が円周方向に略均
一である円周方向着磁ヨークによって、前記円柱状磁性
体の周面上に多重着磁してなることを特徴とするマグネ
ットロールの製造方法。7. A magnetic pole in the form of a strip, which is continuous in the axial direction and has a substantially uniform surface magnetic flux density, is magnetized and formed on the peripheral surface of the cylindrical magnetic body simultaneously with the molding in a magnetic field. Has a plurality of yoke cores that are parallel to the circumferential direction and alternately have different polarities in the axial direction after the different poles are magnetized alternately, and the magnetomotive force of each yoke core is substantially uniform in the circumferential direction. 2. A method for manufacturing a magnet roll, wherein the circumferential magnetizing yoke is a multi-pole magnetized on the peripheral surface of the cylindrical magnetic body.
に異極となる櫛歯状ヨーク芯を有するとともに、各ヨー
ク芯の起磁力が軸方向に等間隔に不均一である軸方向着
磁ヨークによって、円柱状磁性体の周面上に多極着磁し
てなることを特徴とするマグネットロールの製造方法。8. An axial direction having comb tooth-shaped yoke cores that are parallel to the axial direction and have different polarities alternately in the circumferential direction, and the magnetomotive forces of the respective yoke cores are non-uniform at equal intervals in the axial direction. A method of manufacturing a magnet roll, comprising: magnetizing a multi-pole magnet on a circumferential surface of a cylindrical magnetic body by a magnetizing yoke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3753293A JP3109314B2 (en) | 1993-02-01 | 1993-02-01 | Magnet roll and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3753293A JP3109314B2 (en) | 1993-02-01 | 1993-02-01 | Magnet roll and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06231941A true JPH06231941A (en) | 1994-08-19 |
| JP3109314B2 JP3109314B2 (en) | 2000-11-13 |
Family
ID=12500143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3753293A Expired - Fee Related JP3109314B2 (en) | 1993-02-01 | 1993-02-01 | Magnet roll and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3109314B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10147310A1 (en) * | 2001-09-26 | 2003-04-24 | Vacuumschmelze Gmbh & Co Kg | Shell-shaped magnet for an electric motor, has two front surfaces, two side surfaces and two overlapping surfaces curved along the side surfaces angled in a V-shape. |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0513014U (en) * | 1991-07-30 | 1993-02-19 | ミツミ電機株式会社 | Chip coil |
| JPH07272951A (en) * | 1994-03-31 | 1995-10-20 | Toko Inc | Inductance element |
| US6248309B1 (en) | 1997-04-04 | 2001-06-19 | Optiva Corporation | Gums containing antimicrobial agents |
-
1993
- 1993-02-01 JP JP3753293A patent/JP3109314B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10147310A1 (en) * | 2001-09-26 | 2003-04-24 | Vacuumschmelze Gmbh & Co Kg | Shell-shaped magnet for an electric motor, has two front surfaces, two side surfaces and two overlapping surfaces curved along the side surfaces angled in a V-shape. |
| DE10147310B4 (en) * | 2001-09-26 | 2004-06-17 | Vacuumschmelze Gmbh & Co. Kg | Cup-shaped magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3109314B2 (en) | 2000-11-13 |
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| LAPS | Cancellation because of no payment of annual fees |