JPH043549B2 - - Google Patents
Info
- Publication number
- JPH043549B2 JPH043549B2 JP16118282A JP16118282A JPH043549B2 JP H043549 B2 JPH043549 B2 JP H043549B2 JP 16118282 A JP16118282 A JP 16118282A JP 16118282 A JP16118282 A JP 16118282A JP H043549 B2 JPH043549 B2 JP H043549B2
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- cylindrical
- flux density
- joint
- magnetic flux
- 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
Links
- 230000004907 flux Effects 0.000 claims description 16
- 238000011161 development Methods 0.000 claims description 11
- 238000005304 joining Methods 0.000 description 10
- 230000007423 decrease Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding 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】
〔技術分野〕
本発明は電子写真や静電記録を利用した画像再
生装置に使用される乾式現像用永久磁石ロールに
関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a permanent magnet roll for dry development used in an image reproduction device using electrophotography or electrostatic recording.
電子写真や静電記録を利用した画像再生装置と
しては、電子写真複写機、フアクシミリ、プリン
ター等がよく知られている。また、近年注目を集
めているコンピユータを利用して自動設計や各種
図形処理を行なう場合にも、その端末装置にマル
チペン方式あるいは温式の静電記録方式のプロツ
タが使用されている。
2. Description of the Related Art Electrophotographic copying machines, facsimile machines, printers, and the like are well known as image reproduction devices that utilize electrophotography and electrostatic recording. Furthermore, when computers, which have been attracting attention in recent years, are used to perform automatic design and various graphical processing, multi-pen plotters or thermal electrostatic recording plotters are used as terminal devices.
しかして、従来のプロツタには、処理速度が遅
い（例えば湿式の場合約１〜２mm／sec）、静電記
録紙を用いると紙自体の価格が高くランニングコ
ストが高くつく、、湿式の場合、コピー濃度が低
くかつバツクグランドの濃度が高く、画質が悪
い、しかも可燃性液体現像剤を使用しているた
め、悪臭やメインテナンスの問題がある。 However, conventional plotters have a slow processing speed (for example, about 1 to 2 mm/sec in the case of a wet type), and if electrostatic recording paper is used, the paper itself is expensive and running costs are high. The copy density is low, the background density is high, the image quality is poor, and since a flammable liquid developer is used, there are problems with odor and maintenance.
そこでこれらの問題点を解決するために、磁性
トナー等の乾式現像剤を用いた静電記録又は一般
紙への直接記録方式が検討されている。この種記
録方式には、例えば特開昭53−123928号公報にに
記載されているような静電記録方式にもあるいは
特公昭55−30228号公報に記載されているような
直接記録方式にも非磁性材料からなる円筒状のス
リーブの内部に永久磁石部材を配置した磁石ロー
ルが現像ロールとして用いられている。この磁石
ロールとしては、例えば特公昭55−6907号公報に
記載されている如くの一体かつ長尺の円筒状磁石
を有するものが使用されることが多い。通常の複
写機の場合、B5〜A3サイズの複写紙が使用さ
れ、有効現像幅もたかだか420mm位である。一方
上記プロツタの場合、有効現像巾は500〜2000mm
と極めて大であり、それに伴ない永久磁石の長さ
も500mm以上とする必要がある。また永久磁石材
料としては酸化物磁石であるフエライト磁石が通
常用いられるが、このような長尺の円筒状永久磁
石又はブロツク状の異方性永久磁石を一体的に形
成することは、ラバープレス法や押出成形法等の
通常の成形法では乾燥時や焼成時の曲りなどの問
題があり、製造が実質的に困難である。そこで長
さが200〜400mm程度の一体のブロツク状の永久磁
石を製作し、着磁後このブロツク状永久磁石を複
数個軸方向に接合して長さが500mm以上の永久磁
石とすることが考えられる。しかしこの場合、永
久磁石間には多数の継目があるため、継目部での
磁束密度の低下が生じ、現像時に縦縞が生じて画
質の低下をきたすという問題がある。同様に予め
着磁した円筒状永久磁石を継ぎ合わせることも考
えられるが、着磁した円筒状永久磁石材料を継ぎ
合わせると、継目部における同極間の反発効果や
継目部のギヤツプの影響により、ブロツク磁石の
場合と同様に継目部における磁力のバラツキが必
然的に生じてまう。 In order to solve these problems, electrostatic recording using a dry developer such as magnetic toner or direct recording on ordinary paper is being considered. This type of recording method includes, for example, an electrostatic recording method as described in Japanese Patent Application Laid-Open No. 53-123928, and a direct recording method as described in Japanese Patent Publication No. 55-30228. A magnet roll in which a permanent magnet member is arranged inside a cylindrical sleeve made of a non-magnetic material is used as a developing roll. As this magnet roll, one having an integral and elongated cylindrical magnet as described in, for example, Japanese Patent Publication No. 55-6907 is often used. In the case of a normal copying machine, copy paper of B5 to A3 size is used, and the effective development width is about 420 mm at most. On the other hand, in the case of the above Protsuta, the effective development width is 500 to 2000 mm.
Therefore, the length of the permanent magnet must be 500 mm or more. Ferrite magnets, which are oxide magnets, are usually used as permanent magnet materials, but it is difficult to integrally form such long cylindrical permanent magnets or block-shaped anisotropic permanent magnets using the rubber press method. Ordinary molding methods such as extrusion molding and extrusion molding have problems such as bending during drying and firing, making production substantially difficult. Therefore, the idea is to manufacture an integral block-shaped permanent magnet with a length of about 200 to 400 mm, and after magnetization, connect multiple block-shaped permanent magnets in the axial direction to make a permanent magnet with a length of 500 mm or more. It will be done. However, in this case, since there are many seams between the permanent magnets, there is a problem in that the magnetic flux density at the seams decreases, and vertical stripes occur during development, resulting in a decrease in image quality. Similarly, it is possible to join pre-magnetized cylindrical permanent magnets, but when magnetized cylindrical permanent magnet materials are joined together, due to the repulsion between the same poles at the joint and the influence of the gap at the joint, As in the case of block magnets, variations in magnetic force at the joint inevitably occur.
本発明の目的は、上述の従来技術の問題点を排
除し、永久磁石間の接合部での磁束密度の低下に
基因する現像ムラを実質的に解消し、実用性のあ
る現像画像が得られる現像用永久磁石ロールを提
供することである。
An object of the present invention is to eliminate the above-mentioned problems of the prior art, substantially eliminate development unevenness caused by a decrease in magnetic flux density at the joint between permanent magnets, and obtain a developed image with practical use. An object of the present invention is to provide a permanent magnet roll for development.
本発明の現像用永久磁石ロールは、外径Ｄに対
する磁石長さｌの比（ｌ／Ｄ）が３以上の円筒状
永久磁石を複数個軸方向に接合すると共に軸に固
着してなる、表面に複数個の磁極を有する永久磁
石部材と、前記永久磁石部材をわずかな間隔で同
心状に取囲む、非磁性材料からなる円筒状のスリ
ーブとを有する現像用永久磁石ロールにおいて、
前記円筒状永久磁石間の接合ギヤツプが0.11mm以
下であり、かつ前記円筒状永久磁石の外周面は前
記軸を基準として所定寸法に加工した後一体着磁
が施され、前記磁極上における前記接合部のスリ
ーブ上での磁束密度が前記磁極上における非接合
部のスリーブ上での磁束密度の95％以上（但し
100％未満）であることを特徴とする。
The developing permanent magnet roll of the present invention has a surface formed by joining a plurality of cylindrical permanent magnets having a ratio of magnet length l to outer diameter D (l/D) of 3 or more in the axial direction and fixing them to the shaft. A permanent magnet roll for development comprising a permanent magnet member having a plurality of magnetic poles, and a cylindrical sleeve made of a non-magnetic material that concentrically surrounds the permanent magnet member at a small interval,
The joining gap between the cylindrical permanent magnets is 0.11 mm or less, and the outer circumferential surface of the cylindrical permanent magnet is integrally magnetized after being machined to a predetermined size with the axis as a reference, and the joining gap on the magnetic pole is The magnetic flux density on the sleeve of the above-mentioned magnetic pole is 95% or more of the magnetic flux density on the sleeve of the non-bonded part (however,
less than 100%).
以下本発明の詳細を図面により説明する。 The details of the present invention will be explained below with reference to the drawings.
第１図は本発明の現像用永久磁石ロールの一実
施例を示す縦断面図、第２図は第１図のＡ−Ａ断
面図、第３図は第１図の接合部の拡大断面図、第
４図及び第５図は接合ギヤツプと接合部の磁束密
度の関係を示す図である。 FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the permanent magnet roll for development of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. 3 is an enlarged cross-sectional view of the joint shown in FIG. 1. , FIG. 4, and FIG. 5 are diagrams showing the relationship between the joining gap and the magnetic flux density of the joining portion.
まず第１図および第２図において、永久磁石ロ
ール１は、非磁性材料からなる円筒状のスリーブ
２と該スリーブの内部に配置された永久磁石部材
３を有している。この永久磁石部材３は、必ずし
も図とは一致しないが、直径Ｄに対する長さｌが
３倍以上ある円筒状永久磁石４′を複数個接合し
て得られた長さＬが400mm以上の永久磁石体４と
該永久磁石体を支持する軸５から構成されてい
る。そしてスリーブ２の両端にはそれぞれ軸受６
および６′を有するフランジ部材７および７′が挿
入・固定されており、軸５の縮径部５ａおよび５
ｂはそれぞれ軸受６および６′を介してフランジ
部材７および７′に支承されている。ここで、永
久磁石部材４は複数個の永久磁石４′を軸５上に
固着し、ついで軸５を基準として磁石外径を所定
寸法に加工後一体着磁を施して得られる。 First, in FIGS. 1 and 2, a permanent magnet roll 1 has a cylindrical sleeve 2 made of a non-magnetic material and a permanent magnet member 3 disposed inside the sleeve. This permanent magnet member 3 is a permanent magnet with a length L of 400 mm or more obtained by joining a plurality of cylindrical permanent magnets 4' whose length L is three times or more as long as the diameter D. It consists of a body 4 and a shaft 5 that supports the permanent magnet body. Bearings 6 are provided at both ends of the sleeve 2.
and 6' are inserted and fixed, and the reduced diameter portions 5a and 5 of the shaft 5 are inserted and fixed.
b are supported by flange members 7 and 7' via bearings 6 and 6', respectively. Here, the permanent magnet member 4 is obtained by fixing a plurality of permanent magnets 4' on a shaft 5, processing the outer diameter of the magnets to a predetermined size with reference to the shaft 5, and then integrally magnetizing them.
第３図は第１図に示す永久磁石ロールの接合部
の拡大図であり、図中ａは接合ギヤツプ、ｔは磁
束密度の測定ギヤツプを示している。外径29.3mm
φ、内径10mmφ、長さ180mmのBa−フエライト磁
石（８極対称着磁）を用いて、接合部のギヤツプ
ａを種々変化させた場合の接合部の磁束密度分布
を測定したところ第４図に示す結果が得られた。
なお第４図において、測定値ｘは永久磁石表面で
の値をそして測定値ｙは外径32.3mmφのスリーブ
表面での値を示している。そして接合部のギヤツ
プと磁束密度の関係を求めたところ第５図に示す
結果が得られた。 FIG. 3 is an enlarged view of the joint portion of the permanent magnet roll shown in FIG. 1, where a indicates the joint gap and t indicates the measurement gap for magnetic flux density. Outer diameter 29.3mm
Using a Ba-ferrite magnet (8-pole symmetrical magnetization) with φ, inner diameter 10 mmφ, and length 180 mm, we measured the magnetic flux density distribution at the joint when the gap a at the joint was varied. Figure 4 shows the results. The following results were obtained.
In FIG. 4, the measured value x indicates the value on the surface of the permanent magnet, and the measured value y indicates the value on the surface of the sleeve having an outer diameter of 32.3 mmφ. When the relationship between the gap at the joint and the magnetic flux density was determined, the results shown in FIG. 5 were obtained.
第４図および第５図から明らかなように、接合
部のギヤツプａが0.11mm以下であれば接合部での
磁束密度の低下を非接合部での磁束密度の３％以
内に収めることができる。そして本発明者が実験
により確認したところ、接合部の磁束密度の低下
が５％以内であれば現像画像上に実質的に縦縞が
生ぜず、十分実用性のある画像が得られた。従つ
て円筒状永久磁石を複数個接合して長さが400mm
以上の永久磁石を得る場合は、上記のように接合
部のギヤツプを0.11mm以下とすれば良好な結果が
得られる。 As is clear from Figures 4 and 5, if the gap a at the joint is 0.11 mm or less, the decrease in magnetic flux density at the joint can be kept within 3% of the magnetic flux density at the non-joint part. . The present inventor has confirmed through experiments that if the decrease in magnetic flux density at the joint is within 5%, substantially no vertical stripes will occur on the developed image, and a sufficiently practical image can be obtained. Therefore, by joining multiple cylindrical permanent magnets, the length is 400 mm.
When obtaining the above permanent magnet, good results can be obtained by setting the gap at the joint to 0.11 mm or less as described above.
本発明では単に円筒状永久磁石を軸方向に接合
したのではなく、あくまで磁石を接合後軸を基準
としてその外径を所定寸法に加工しついで一体着
磁を施しているため、上記の如くの接合部での磁
束密度の低下を実質的に防止できる。これに反し
て、同じ円筒状永久磁石を用いた場合でも、最初
に各磁石の外径を所定寸法に加工した後着磁しつ
いで接合したものでは磁極のズレや接合時の同極
反発等により接合部での磁力低下が10〜20％にも
達し、十分な特性が得られなかつた。 In the present invention, cylindrical permanent magnets are not simply joined in the axial direction, but after joining, the outer diameter of the magnet is machined to a predetermined size with the shaft as a reference, and then integrally magnetized, so that the above-mentioned A decrease in magnetic flux density at the joint can be substantially prevented. On the other hand, even if the same cylindrical permanent magnets are used, if the outer diameter of each magnet is first machined to a specified size and then magnetized and then bonded, problems such as misalignment of magnetic poles and homopolar repulsion during bonding may occur. The decrease in magnetic force at the joint reached 10 to 20%, and sufficient characteristics could not be obtained.
また、上記の説明では、円筒状永久磁石材料と
して等方性のBa−フエライト磁石材料を用いた
が、円筒状であればこれに限らず異方性に配向さ
れた永久磁石や米国特許第3455276号明細書に記
載されている如くの可撓性永久磁石を使用するこ
とも可能である。但し、異方性の永久磁石を使用
する場合は、接合される磁石相互の異方性方向も
一致させる必要があることから、長さ方向及び半
径方向共に実質的に特性の変わらない等方性永久
磁石材を用いることが好ましい。 Furthermore, in the above explanation, an isotropic Ba-ferrite magnet material is used as the cylindrical permanent magnet material, but the material is not limited to this if it is cylindrical. It is also possible to use flexible permanent magnets, such as those described in No. However, when using anisotropic permanent magnets, it is necessary to match the anisotropy direction of the magnets to be joined, so it is necessary to use isotropic magnets with virtually no change in characteristics in both the longitudinal and radial directions. Preferably, a permanent magnetic material is used.
また、永久磁石部材の外周にスリーブを同心状
に装着する場合、スリーブのフレは0.1TIR以下
にすることが好ましい。 Further, when the sleeve is attached concentrically to the outer periphery of the permanent magnet member, it is preferable that the deflection of the sleeve is 0.1 TIR or less.
以上に記述の如く、本発明の現像用永久磁石ロ
ールによれば、永久磁石間の接合部での磁束密度
の低下が極めてわずかであり、実用性のある高品
質の画像が得られる。
As described above, according to the permanent magnet roll for development of the present invention, the decrease in magnetic flux density at the joint between the permanent magnets is extremely small, and a high-quality image that is practical can be obtained.
第１図は本発明の永久磁石ロールをそなえた現
像ロールの一例を示す断面図、第２図は第１図の
Ａ−Ａ断面図、第３図は第１図の接合部の拡大
図、第４図および第５図は接合ギヤツプと接合部
の磁束密度の関係を示す図である。
２：スリーブ、３：永久磁石ロール、４，
４′：永久磁石、５：軸。
FIG. 1 is a sectional view showing an example of a developing roll equipped with a permanent magnet roll of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is an enlarged view of the joint in FIG. 1. FIGS. 4 and 5 are diagrams showing the relationship between the joining gap and the magnetic flux density of the joining portion. 2: Sleeve, 3: Permanent magnet roll, 4,
4': Permanent magnet, 5: Axis.
Claims (1)
３以上の円筒状永久磁石を複数個軸方向に接合す
ると共に軸に固着してなる、表面に複数個の磁極
を有する永久磁石部材と、前記永久磁石部材をわ
ずかな間〓で同心状に取囲む、非磁性材料からな
る円筒状のスリーブとを有する現像用永久磁石ロ
ールにおいて、前記円筒状永久磁石間の接合ギヤ
ツプが0.11mm以下であり、かつ前記円筒状永久磁
石の外周面は前記軸を基準として所定寸法に加工
した後一体着磁が施され、前記磁極上における前
記接合部のスリーブ上での磁束密度が前記磁極上
における非接合部のスリーブ上での磁束密度の95
％以上（但し100％未満）であることを特徴とす
る現像用永久磁石ロール。 ２ 円筒状永久磁石として長さ方向ならびに半径
方向共に実質的に同一の磁気特性を有する等方性
の永久磁石を使用したことを特徴とする特許請求
の範囲第１項記載の現像用永久磁石ロール。 ３ 永久磁石部材が400mm以上の磁石長さを有す
ることを特徴とする特許請求の範囲第１項記載の
現像用永久磁石ロール。[Claims] 1. A plurality of cylindrical permanent magnets having a ratio of magnet length l to outer diameter D (l/D) of 3 or more are joined in the axial direction and fixed to the shaft, and a plurality of cylindrical permanent magnets are attached to the surface. A developing permanent magnet roll having a permanent magnet member having a magnetic pole of a joint gap of 0.11 mm or less, and the outer circumferential surface of the cylindrical permanent magnet is integrally magnetized after being machined to a predetermined size with the shaft as a reference, and the joint gap on the sleeve on the magnetic pole is The magnetic flux density is 95% of the magnetic flux density on the sleeve of the non-bonded part on the magnetic pole.
% or more (but less than 100%). 2. A permanent magnet roll for development according to claim 1, wherein an isotropic permanent magnet having substantially the same magnetic properties in both the longitudinal direction and the radial direction is used as the cylindrical permanent magnet. . 3. The permanent magnet roll for development according to claim 1, wherein the permanent magnet member has a magnet length of 400 mm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16118282A JPS5950468A (en) | 1982-09-16 | 1982-09-16 | Permanent magnet roll for development |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16118282A JPS5950468A (en) | 1982-09-16 | 1982-09-16 | Permanent magnet roll for development |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5950468A JPS5950468A (en) | 1984-03-23 |
| JPH043549B2 true JPH043549B2 (en) | 1992-01-23 |
Family
ID=15730141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16118282A Granted JPS5950468A (en) | 1982-09-16 | 1982-09-16 | Permanent magnet roll for development |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5950468A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH069788B2 (en) * | 1985-09-24 | 1994-02-09 | 伊藤機工株式会社 | Shot blasting machine |
| JPH0278258U (en) * | 1988-12-03 | 1990-06-15 |
-
1982
- 1982-09-16 JP JP16118282A patent/JPS5950468A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5950468A (en) | 1984-03-23 |
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