JPH0469388B2 - - Google Patents
Info
- Publication number
- JPH0469388B2 JPH0469388B2 JP58026549A JP2654983A JPH0469388B2 JP H0469388 B2 JPH0469388 B2 JP H0469388B2 JP 58026549 A JP58026549 A JP 58026549A JP 2654983 A JP2654983 A JP 2654983A JP H0469388 B2 JPH0469388 B2 JP H0469388B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnet
- roll
- poles
- pole
- 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.)
- Expired - Lifetime
Links
- 230000005291 magnetic effect Effects 0.000 claims description 69
- 229910000859 α-Fe Inorganic materials 0.000 claims description 14
- 230000004907 flux Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 239000000696 magnetic material Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 6
- 230000005294 ferromagnetic effect Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims 1
- 238000000034 method Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007790 scraping 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
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0921—Details concerning the magnetic brush roller structure, e.g. magnet configuration
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は電子写真やフアクシミリ受信機などの
磁気ブラシ現像用磁石ロールに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnet roll for magnetic brush development in electrophotography, facsimile receivers, and the like.
従来例の構成とその問題点
従来の磁気ブラシ現像用磁石ロールにおけるロ
ール状磁石としては、フエライト粒子を円筒状に
一体成形し、焼結工程を経た後、その外周面に着
磁を施した円筒形の焼結フエライト磁石を用いる
ものがよく知られている。Structure of the conventional example and its problems The rolled magnet in the conventional magnet roll for magnetic brush development is a cylinder in which ferrite particles are integrally molded into a cylindrical shape and the outer peripheral surface is magnetized after going through a sintering process. It is well known to use sintered ferrite magnets.
このような方法によつて製造されるロール状磁
石は、磁気ブラシ現像用磁石ロールとして、軸方
向に継目がないため、現像ムラを生じないという
利点があるが、同時に、円筒状にて一体の焼結工
程が必要なため、焼結条件にて部分的に収縮率が
異なり、一定の寸法のものが得られにくく、また
工程的にも複雑で、取扱いとしても破損しやすく
歩留りの点でも著しく不利なるという問題があつ
た。 The rolled magnet manufactured by this method has the advantage that it can be used as a magnet roll for magnetic brush development because there is no seam in the axial direction, so uneven development does not occur. Since a sintering process is required, the shrinkage rate varies depending on the sintering conditions, making it difficult to obtain products with uniform dimensions.The process is also complex, and it is easy to break when handled, resulting in a significant drop in yield. There was a problem that I was at a disadvantage.
さらにこのロール状磁石は、比重が5.0〜5.2と
大きく、ロール状一体成形されているため磁石ロ
ール全体が重くなるという欠点があつた。 Furthermore, this roll-shaped magnet had a large specific gravity of 5.0 to 5.2, and was integrally molded into a roll, which resulted in the drawback that the entire magnet roll was heavy.
上記の利点を維持しながら、これらの欠点を除
くために他の従来のロール状磁石の製造法として
は、磁気異方性処理をしたフエライト粒子と、こ
のフエライト粒子を接合するゴム系および、合成
樹脂を混合した複合フエライト材料を使用し、ロ
ール状表面の各磁極を中心に強磁性軸を放射状に
配列させて、強磁力のロール状磁石としたものが
提案されている（特公昭６−51481号公報）。 In order to eliminate these disadvantages while maintaining the above-mentioned advantages, other conventional methods for manufacturing roll magnets include magnetically anisotropically treated ferrite particles, rubber-based bonding of the ferrite particles, and synthetic It has been proposed that a composite ferrite material mixed with resin is used to create a roll-shaped magnet with strong magnetic force by arranging ferromagnetic axes radially around each magnetic pole on the roll-shaped surface (Japanese Patent Publication No. 6-51481 Publication No.).
そしてその方法により製造された磁気現像用磁
石ロールは第１図に示すように、ロール状磁石１
がシヤフト２に固定されており、このロール状磁
石１の外側には非磁性体の円筒状スリーブ３が同
心状に配置されて、両端の軸受部（図示しない）
を介して、回転可能に取り付けた構成である。そ
して一般的にロール状磁石１の表面磁極の磁力分
布は現像面に対抗した現像極４が最も大きな磁力
を必要とし、その他トナーの搬送極５およびトナ
ーを円筒状スリーブ３の表面に吸着させるための
吸着極６等は、現像極４よりも小さな磁力を与え
るものである。 As shown in FIG. 1, the magnetic development magnet roll manufactured by this method has a roll-shaped magnet 1
is fixed to the shaft 2, and a non-magnetic cylindrical sleeve 3 is arranged concentrically on the outside of the rolled magnet 1, and bearings (not shown) at both ends are attached.
It is configured to be rotatably attached via the . In general, the magnetic force distribution of the surface magnetic poles of the roll magnet 1 requires the largest magnetic force for the developing pole 4 facing the developing surface, and for the other toner transport poles 5 and the surface of the cylindrical sleeve 3 to attract the toner. The attraction pole 6 and the like give a smaller magnetic force than the development pole 4.
発明の目的
本発明は上記ロール状磁石をさらに改善し、さ
らに軽量化と低価格化とを達成する磁気ブラシ現
像用磁石ロールを提供するものである。OBJECTS OF THE INVENTION The present invention provides a magnet roll for magnetic brush development that further improves the roll-shaped magnet described above and achieves further weight reduction and cost reduction.
発明の構成
上記目的を達成するために本発明はあらかじめ
円弧上の一点から両側面および底面の３方向にフ
エライト粒子の配向軸を揃えた磁石材料を作成
し、これら磁石材料を組み合わせて円弧上の磁極
を中心とする配向磁路を放射状に配列するように
配置し、表面に複数個の磁極を有し、その各磁極
を中心に強磁性軸を放射状に配列した複合フエラ
イト材料からなるロール状磁石を非磁性体からな
る円筒状スリーブ内に同心状に配置し、隣接する
両磁極より小さな磁石材料を軸方向全域にわたつ
て排除した構成としたものである。Structure of the Invention In order to achieve the above object, the present invention creates magnet materials in which the orientation axes of ferrite particles are aligned in three directions from one point on the arc to both sides and the bottom, and then combines these magnet materials to A rolled magnet made of a composite ferrite material with oriented magnetic paths arranged radially around magnetic poles, multiple magnetic poles on the surface, and ferromagnetic axes arranged radially around each magnetic pole. are arranged concentrically within a cylindrical sleeve made of a non-magnetic material, and magnet material smaller than both adjacent magnetic poles is excluded throughout the entire axial direction.
この磁石材料の排除により大幅な軽量化が図
れ、また磁石材料の節約にもつながり、低価格の
磁気ブラシ現像用磁石ロールを得ることができ
る。 Elimination of this magnet material makes it possible to achieve a significant weight reduction, which also leads to savings in magnet material, making it possible to obtain a low-cost magnet roll for magnetic brush development.
実施例の説明
以下本発明の一実施例における磁気ブラシ現像
用磁石ロールについて、図面とともに説明する。DESCRIPTION OF EMBODIMENTS A magnet roll for magnetic brush development according to an embodiment of the present invention will be described below with reference to the drawings.
本発明の一実施例における磁気ブラシ現像用磁
石ロールは、第２図、第３図に示すように、シヤ
フト２に円弧状の一点から両側面および底面の３
方向にフエライト粒子の配向軸を有する磁石材料
組み合せその磁石材料の外表面に磁極４〜６を設
け、その外周に非磁性体の円筒状スリーブ３を被
せた構成において、ロール状外周面から内周面に
連続し、かつ軸方向全域にわたつて、一部磁石材
料を排除することにある。この磁石材料の存在し
ない磁極部７の構成を、磁束の流れから説明する
と、第３図および第４図に示すように、一方の隣
接する円弧上の磁極６から側面に形成された配向
磁路により発生する異方向（隣接した磁極の表面
がＮ極の場合はＳ極）の磁束８と、もう一方の隣
接する円弧上の磁極９から側面に形成された配向
磁路により発生する同様の異方向の磁束１０が、
円筒状スリーブ３の表面上においても存在し、こ
の２つの磁束８，１０の合成された磁界１１が、
この磁極７を構成することになる。 As shown in FIGS. 2 and 3, the magnetic brush developing magnet roll according to one embodiment of the present invention has a shaft 2 with three arcuate points on both sides and the bottom.
A combination of magnetic materials having an orientation axis of ferrite particles in the direction. Magnetic poles 4 to 6 are provided on the outer surface of the magnetic material, and a cylindrical sleeve 3 of non-magnetic material is covered on the outer periphery. The objective is to exclude a portion of the magnet material that is continuous with the surface and extends throughout the entire axial direction. To explain the structure of the magnetic pole part 7 in which no magnet material is present in terms of the flow of magnetic flux, as shown in FIGS. 3 and 4, an oriented magnetic path is formed on the side surface from the magnetic pole 6 on one adjacent circular arc. magnetic flux 8 in different directions (if the surface of the adjacent magnetic pole is N pole, then S pole) generated by magnetic flux 8, and a similar difference generated by the oriented magnetic path formed on the side surface from magnetic pole 9 on the other adjacent arc. The magnetic flux 10 in the direction is
A magnetic field 11 that is also present on the surface of the cylindrical sleeve 3 and is a composite of these two magnetic fluxes 8 and 10,
This constitutes the magnetic pole 7.
シヤフト２に固定した各磁極の磁石材料は、円
弧上の磁極を中心に両側面および底面方向にフエ
ライト粒子の強磁性軸を放射状に配列されてい
る。これは、圧延ローラ等を用いてあらかじめ厚
さ方向に強磁性軸の方向を揃えた複合磁性材シー
トを作成し、これを一定の厚さに積層した後、断
面扇形状で円弧上の一点から３方向に配向軸を揃
えた形状に加圧プレスなどして成形しシヤフト２
に接着剤を用いて固定し円柱状としている。ロー
ル状表面の磁極に対する異方向の磁極は扇形の磁
極６，９のピースの側面１２に存在し、円筒状ス
リーブ３の外周までの距離が近いため、大きな磁
力を残したまま、磁束８，１０は図のように流れ
る。 The magnetic material of each magnetic pole fixed to the shaft 2 has ferromagnetic axes of ferrite particles arranged radially on both sides and in the direction of the bottom surface with the magnetic pole on an arc as the center. This is done by creating composite magnetic material sheets with the ferromagnetic axes aligned in the thickness direction using a rolling roller, etc., and then laminating them to a certain thickness. Shaft 2 is formed by pressure pressing into a shape with orientation axes aligned in three directions.
It is fixed using adhesive to form a cylindrical shape. The magnetic poles in the opposite direction to the magnetic poles on the rolled surface exist on the side surfaces 12 of the pieces of the fan-shaped magnetic poles 6 and 9, and because the distance to the outer circumference of the cylindrical sleeve 3 is short, the magnetic fluxes 8 and 10 remain large magnetic force. flows as shown in the figure.
このようにしてできた磁極７の磁界の強さは、
排除部の寸法Ａによつて、第５図のような特性を
得ることがきで、寸法Ａを小さくすると、両隣接
の磁束が集中し、大きな磁束密度を得ることにな
り、寸法Ａを大きくすると磁束が分散して、磁束
密度が小さくなる。 The strength of the magnetic field of the magnetic pole 7 created in this way is
Depending on the dimension A of the excluded part, the characteristics shown in Figure 5 can be obtained.If the dimension A is made small, the magnetic flux on both sides will concentrate, resulting in a large magnetic flux density, and if the dimension A is made large, The magnetic flux is dispersed and the magnetic flux density becomes smaller.
したがつて、寸法Ａを変化させることにより隣
接するどちらか強い方の磁極の70％以内であれ
ば、任意に規定することが可能になり、その延長
として、略零磁界部を作ることも可能になる。 Therefore, by changing the dimension A, it is possible to arbitrarily specify the magnetic field as long as it is within 70% of the strength of either of the adjacent magnetic poles, and as an extension of this, it is also possible to create a nearly zero magnetic field area. become.
発明の効果
以上のように本発明は現像極以外の磁極の一部
および、スリーブ表面からトナーを掻き落すため
の略零磁界部において、磁石材料を排除している
ため、磁石ロールとして、大巾な軽量化が達成で
き、従来の円筒状一体焼結フエライト磁石と比較
すると、複合フエライト材料はその比重が3.5〜
3.6と約30％軽減されているうえに、さらに磁極
分布によつては、約30％の軽減が可能になる。ま
た磁石材料の節約にもつながり、低価格の磁石ロ
ールを得ることができるなどの利点を持ち、工業
的価値の大なるものである。Effects of the Invention As described above, the present invention eliminates magnetic material in a part of the magnetic pole other than the developing pole and in the substantially zero magnetic field part for scraping toner off the sleeve surface. Compared to conventional cylindrical integrally sintered ferrite magnets, the composite ferrite material has a specific gravity of 3.5~
3.6, which is about a 30% reduction, and depending on the magnetic pole distribution, a further about 30% reduction is possible. It also leads to savings in magnet materials and has the advantage of being able to obtain low-cost magnet rolls, so it is of great industrial value.
第１図は従来の磁気ブラシ現像用磁石ロールの
断面図、第２図は本発明の磁気ブラシ現像用磁石
ロールの一実施例を示す断面図、第３図は同要部
拡大断面図、第４図は同スリーブ表面における磁
束密度の円周方向の分布図、第５図は磁極部の排
除間隔とその磁束密度との関係を示す特性図であ
る。
１……ロール状磁石、２……シヤフト、３……
円筒状スリーブ、４，５，６，９……磁極。
FIG. 1 is a sectional view of a conventional magnetic brush developing magnet roll, FIG. 2 is a sectional view showing an embodiment of the magnetic brush developing magnet roll of the present invention, and FIG. 3 is an enlarged sectional view of the same essential parts. FIG. 4 is a distribution diagram of the magnetic flux density in the circumferential direction on the surface of the sleeve, and FIG. 5 is a characteristic diagram showing the relationship between the exclusion interval of the magnetic pole portions and the magnetic flux density. 1... Roll magnet, 2... Shaft, 3...
Cylindrical sleeve, 4, 5, 6, 9...magnetic poles.
Claims (1)
フエライト粒子を接合する媒質とを混合した複合
フエライト材料からなり、円弧上の一点から両側
面および底面の３方向にフエライト粒子の配向軸
を揃えた磁石材料を組み合わせ表面に複数個の磁
極を有しその各磁極を中心に強磁性軸を放射状に
配列したロール状磁石を非磁性体の円筒状スリー
ブ内に同心状に配置し、隣接する上記両磁極より
小さな磁界を必要とする磁極部分の磁石材料を軸
方向全域にわたつて排除した磁気ブラシ現像用磁
石ロール。 ２ 隣接する両磁極のうち、いずれか一方の磁極
の70％以下の磁束密度を必要とする磁極部分の磁
石材料を排除した特許請求の範囲第１項記載の磁
気ブラシ現像用磁石ロール。[Scope of Claims] 1. A composite ferrite material made of a mixture of magnetically anisotropically treated ferrite particles and a medium for bonding the ferrite particles; A rolled magnet with multiple magnetic poles on its surface and ferromagnetic axes arranged radially around each magnetic pole is arranged concentrically within a cylindrical sleeve of non-magnetic material. A magnet roll for magnetic brush development, in which magnet material in a magnetic pole portion that requires a smaller magnetic field than the two adjacent magnetic poles is removed over the entire axial direction. 2. The magnetic brush developing magnet roll according to claim 1, which excludes a magnetic material in a magnetic pole portion that requires a magnetic flux density of 70% or less of that of either one of the two adjacent magnetic poles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2654983A JPS59152469A (en) | 1983-02-18 | 1983-02-18 | Magnet roll for magnetic brush development |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2654983A JPS59152469A (en) | 1983-02-18 | 1983-02-18 | Magnet roll for magnetic brush development |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59152469A JPS59152469A (en) | 1984-08-31 |
| JPH0469388B2 true JPH0469388B2 (en) | 1992-11-06 |
Family
ID=12196591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2654983A Granted JPS59152469A (en) | 1983-02-18 | 1983-02-18 | Magnet roll for magnetic brush development |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59152469A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0683203A (en) * | 1992-08-28 | 1994-03-25 | Canon Inc | Developing device |
| JP4506944B2 (en) * | 2003-12-25 | 2010-07-21 | Ｔｄｋ株式会社 | Magnet roll magnetizing method and apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5380236A (en) * | 1976-12-24 | 1978-07-15 | Hitachi Metals Ltd | Permanent magnet roll used for development of electrophotography |
| JPS5971067A (en) * | 1982-10-15 | 1984-04-21 | Sumitomo Special Metals Co Ltd | Permanent magnet roll |
| JPS59145507A (en) * | 1983-02-09 | 1984-08-21 | Hitachi Metals Ltd | Magnet-roll for dry development |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5468633U (en) * | 1977-10-17 | 1979-05-16 |
-
1983
- 1983-02-18 JP JP2654983A patent/JPS59152469A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5380236A (en) * | 1976-12-24 | 1978-07-15 | Hitachi Metals Ltd | Permanent magnet roll used for development of electrophotography |
| JPS5971067A (en) * | 1982-10-15 | 1984-04-21 | Sumitomo Special Metals Co Ltd | Permanent magnet roll |
| JPS59145507A (en) * | 1983-02-09 | 1984-08-21 | Hitachi Metals Ltd | Magnet-roll for dry development |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59152469A (en) | 1984-08-31 |
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