JPH087497B2 - Development device - Google Patents
Development deviceInfo
- Publication number
- JPH087497B2 JPH087497B2 JP62249956A JP24995687A JPH087497B2 JP H087497 B2 JPH087497 B2 JP H087497B2 JP 62249956 A JP62249956 A JP 62249956A JP 24995687 A JP24995687 A JP 24995687A JP H087497 B2 JPH087497 B2 JP H087497B2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- developing
- developing sleeve
- carrier
- width
- 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
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
- G03G15/0942—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush with means for preventing toner scattering from the magnetic brush, e.g. magnetic seals
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、電子写真法、静電記録法等における潜像を
現像する技術の分野において利用され、特に磁性粒子と
トナーとから成る二成分現像剤を用いて磁気ブラシを形
成してトナーを潜像担持体へ移行せしめる装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is used in the field of technology for developing a latent image in electrophotography, electrostatic recording and the like, and in particular, a two-component composed of magnetic particles and toner. The present invention relates to an apparatus for forming a magnetic brush using a developer and transferring toner to a latent image carrier.
（従来の技術及び問題点） この種の現像装置は、最大画像領域幅Ｌをもつ潜像担
持体に、外周面にコーティング幅Ｌ′で現像剤を磁気ブ
ラシを形成する現像スリーブ等の現像担持体（以下「現
像スリーブ」という）。を近接して配置している。磁気
ブラシは、現像スリーブに内蔵される磁界発生手段によ
る磁気力によって、現像スリーブ表面に磁性粒子が穂立
ち状に形成され、該磁性粒子表面にトナーが静電力で付
着している。そして、かかる状態で感光ドラム等の潜像
担持体（以下「感光ドラム」という）。と現像スリーブ
との間にバイアス電圧を印加することによって、トナー
を感光ドラムへ移行せしめるようになっている。(Prior Art and Problems) In this type of developing device, a latent image carrier having a maximum image area width L is provided with a developing sleeve such as a developing sleeve for forming a magnetic brush with a developer having a coating width L ′ on the outer peripheral surface. Body (hereinafter referred to as "developing sleeve"). Are placed close to each other. In the magnetic brush, magnetic particles are formed in a spike shape on the surface of the developing sleeve by a magnetic force generated by a magnetic field generating means built in the developing sleeve, and toner adheres to the surface of the magnetic particles by electrostatic force. In this state, the latent image carrier such as the photosensitive drum (hereinafter referred to as "photosensitive drum"). By applying a bias voltage between the developing sleeve and the developing sleeve, the toner is transferred to the photosensitive drum.
かかる従来装置においては、上記感光ドラム上の最大
画像領域幅Ｌと現像スリーブ上の現像剤コーティング
Ｌ′の関係は、画像両端部での濃度低下を防止すべくＬ
≦Ｌ′と設定されるので通常であった。In such a conventional apparatus, the relationship between the maximum image area width L on the photosensitive drum and the developer coating L'on the developing sleeve is L in order to prevent a decrease in density at both ends of the image.
Since it was set as ≤L ', it was normal.
従来の二成分現像装置においては、現像領域に存在す
る現像剤（トナー量）に対して実際に現像に供されるト
ナー量が極端に少ない状態すなわち現像効率が低い状態
で現像がなされているために、現像領域には十分な現像
剤量（トナーとキャリアを含める）が必要となる。いか
も現像剤のコーティングは、現像スリーブの回転につれ
て、その端部より拡がり端部付近が疎になりやすい。ま
た感光ドラムとの最近接位置では、現像剤の磁気ブラシ
の穂立ちが感光ドラムとの接触により中央部にて密にな
るが端部では端部での磁力線の影響で横（軸方向）へ拡
がって疎になってしまう。かくして、中央部付近と端部
付近の現像剤の密度（量）に差が生じかつ現像効率の低
さの影響も受けて、端部では濃度薄となる傾向を生じて
いた。そこで、一般の二成分現像装置では上述したごと
く最大像領域幅Ｌに対して現像剤コーティング幅Ｌ′を
Ｌ≦Ｌ′の関係をもって設定していた。In the conventional two-component developing device, since the amount of toner actually used for the development is extremely small with respect to the developer (toner amount) existing in the developing area, that is, the developing efficiency is low. In addition, a sufficient amount of developer (including toner and carrier) is required in the developing area. As the developing sleeve rotates, the coating of the developer spreads more easily than its end and becomes sparse in the vicinity of the end. Also, at the position closest to the photosensitive drum, the spikes of the magnetic brush of the developer become dense at the central part due to contact with the photosensitive drum, but at the end part sideways (axial direction) due to the magnetic line of force at the end part. It spreads and becomes sparse. Thus, there is a difference in the density (amount) of the developer in the vicinity of the central portion and in the vicinity of the end portion, and there is a tendency for the concentration to be low at the end portion due to the influence of low development efficiency. Therefore, in a general two-component developing device, the developer coating width L'is set to have a relationship of L≤L 'with respect to the maximum image area width L as described above.
しかしながら、この場合画像領域幅以外にも現像剤が
存在することとなるために、そのトナーが感光ドラムへ
融着したり機内で飛散等をひきおこして好ましくない現
象をもたらしていた。However, in this case, since the developer is present in addition to the width of the image area, the toner is fused to the photosensitive drum or scattered in the machine, which causes an undesirable phenomenon.
（発明の構成） 本発明は、上述の両端部での画像濃度低下を惹起する
ことなく、最大画像領域両端部付近のトナー飛散や感光
体へのトナーの融着を防止できる現像装置を提供するこ
とを目的とする。(Structure of the Invention) The present invention provides a developing device capable of preventing toner scattering near both ends of the maximum image area and fusion of toner to a photoreceptor without causing a decrease in image density at the both ends described above. The purpose is to
本発明は、上記目的の達成のために、 最大画像領域幅Ｌをもつ潜像担持体と、該潜像担持体
と所定の間隙ｄをもって現像領域を形成しトナーとキャ
リアとを有する現像剤を担持する現像剤担持体と、現像
剤担持体に対して対向配置されて該現像剤担持体の上記
現像領域での現像剤担持幅をＬ′に規制する規制部材と
を有する現像装置において、 現像領域でのキャリアの穂の長さをｌとしたとき、 Ｌ−２（ｌ−ｄ）＜Ｌ′＜Ｌ を満たす、 ことにより構成される。In order to achieve the above object, the present invention provides a latent image carrier having a maximum image area width L, and a developer having a toner and a carrier forming a development area with a predetermined gap d from the latent image carrier. A developing device comprising: a developer carrying member to be carried; and a restricting member arranged to face the developer carrying member to restrict the developer carrying width in the developing area of the developer carrying member to L '. When the length of the ears of the carrier in the region is 1, L-2 (ld) <L '<L is satisfied.
（実施例） 以下、本発明の実施例を添付図面にもとづいて説明す
る。(Example) Hereinafter, an example of the present invention is described based on an accompanying drawing.
第１図において、１は潜像担持体たる感光ドラムで、
該感光ドラム１に対して間隔ｄをもって現像剤担持体た
る現像スリーブ２が互いに平行で回転自在に配設されて
いる。In FIG. 1, reference numeral 1 is a photosensitive drum which is a latent image carrier.
A developing sleeve 2 as a developer carrying member is rotatably arranged in parallel to the photosensitive drum 1 with a distance d therebetween.
現像スリーブ２は、第２図の矢印ａにて示されるごと
くに回転可能な中空円筒体状をなし、その内部空間には
静止せる円柱状の多極磁石３を内蔵している。上記現像
スリーブ２は、現像剤を収容せる容器（図示せず）の、
軸方向に延びる前部開口から一部突出して上記感光ドラ
ム１と上記間隔ｄを保って現像領域を形成している。The developing sleeve 2 is in the form of a rotatable hollow cylindrical body as indicated by the arrow a in FIG. 2, and has a cylindrical multi-pole magnet 3 which is stationary in its internal space. The developing sleeve 2 is a container (not shown) for storing a developer.
A developing region is formed by partially projecting from a front opening extending in the axial direction and maintaining the distance d from the photosensitive drum 1.
現像剤は上記容器中にあって、キャリアたる磁性粒体
とトナーたる非磁性粒子が混合して成っている。キャリ
アは、現像スリーブの回転に伴なう現像剤の攪拌によっ
て生ずる静電力によってトナーが付着された状態で、上
記磁石３が生ずる磁力により現像スリーブ２の外表面に
穂立ちしていわゆる磁気ブラシを形成する。The developer is contained in the above-mentioned container and is composed of magnetic particles as carriers and non-magnetic particles as toner. In the state where the toner is attached by the electrostatic force generated by the stirring of the developer accompanying the rotation of the developing sleeve, the carrier stands up on the outer surface of the developing sleeve 2 by the magnetic force generated by the magnet 3 and forms a so-called magnetic brush. Form.
現像スリーブ２の直上方には、間隔ｌ0をもって該現
像スリーブ２と平行に延びる規制ブレード４が容器に取
付けられていて、上記磁気ブラシを上記間隔ｌ0にほぼ
等しい高さｌ（自由状態での各穂立ちの、現像スリーブ
表面に垂直方向の高さ）としている。上記規制ブレード
４の両端部には、現像スリーブ２に形成される磁気ブラ
シの範囲（軸方向幅）である現像剤コーティング幅Ｌ′
を端部規制部材５が上記現像スリーブ２に接触するよう
に設けられている。コーティング幅を定める、二つの端
部規制部材の内縁同士の間隔Ｌ′は、感光ドラム１の最
大画像領域幅Ｌ等との関係において、次式で定める寸法
に設定されている。A regulating blade 4 extending in parallel with the developing sleeve 2 at a distance l 0 is attached to the container immediately above the developing sleeve 2, and the magnetic brush has a height l (in a free state) substantially equal to the distance l 0. The height of each of the spikes in the direction vertical to the surface of the developing sleeve). At both ends of the regulation blade 4, a developer coating width L'that is the range (axial width) of the magnetic brush formed on the developing sleeve 2 is formed.
The end regulating member 5 is provided so as to contact the developing sleeve 2. The distance L ′ between the inner edges of the two end regulating members, which determines the coating width, is set to a dimension defined by the following equation in relation to the maximum image area width L of the photosensitive drum 1 and the like.
Ｌ−２（ｌ−ｄ）＜Ｌ′＜Ｌ なお、かかる構成の本実施例装置において、磁気ブラ
シのトナーを感光ドラムへ移行せしめるために、感光ド
ラム１の少なくとも画像部と現像スリーブ２との間に
は、電圧６（第３図参照）により直流成分の重畳されて
いる交互電界が形成されていて、トナーが感光ドラムへ
移行するようになっている。このトナーの移行のメカニ
ズムについては、すでに公知であり、本発明の主眼とす
るところではないので詳説は避けることとする。L-2 (l-d) <L '<L In the apparatus of this embodiment having such a configuration, at least the image portion of the photosensitive drum 1 and the developing sleeve 2 are arranged in order to transfer the toner of the magnetic brush to the photosensitive drum. An alternating electric field in which a DC component is superposed is formed by a voltage 6 (see FIG. 3) between them, and the toner is transferred to the photosensitive drum. The mechanism of this toner transfer is already known and is not the main subject of the present invention, so a detailed description thereof will be omitted.
次に、本実施例装置における動作について説明する。 Next, the operation of the apparatus of this embodiment will be described.
現像スリーブ２には現像剤が穂立ち状に形成される磁
気ブラシは、現像スリーブ２の回転によって規制部材４
の位置にもたらされ、ここを通過する。その結果、磁気
ブラシは、自由長で各穂立ちの高さがｌに整えられる。
なお、この高さｌは、既述のごとく、感光ドラム１と現
像スリーブ２との間隔ｄよりも大に設定されている。The magnetic brush, on which the developer is formed in a spike shape on the developing sleeve 2, is regulated by the rotation of the developing sleeve 2.
Will be brought to the position of and pass through here. As a result, the magnetic brush has a free length and the height of each spike is adjusted to l.
The height l is set to be larger than the distance d between the photosensitive drum 1 and the developing sleeve 2 as described above.
上記高さｌの磁気ブラシが、上記間隔ｄをなす現像領
域にもたらされると、第３図に示されるごとく、ｌ＜ｄ
なるが故に上記磁気ブラシは感光ドラム１の表面と接触
して折曲し、その結果この領域で均一かつ密なる状態で
現像剤を存在するようになる。この現像は、軸方向のす
べての範囲で生ずるが、軸方向両端部においては、磁石
３の端部での影響を受けて、上記折曲した長さ、すなわ
ちｌ−ｄにほぼ等しい分だけ軸方向外方に拡がる（第１
図参照）。さらにこれに加え、磁気ブラシ方式では、一
般に一定幅（軸方向幅）をもつ磁気ブラシが現像領域に
到達するまでに、現像スリーブの回転に伴なう振動等の
影響を受けてその幅が磁性粒子の１列ないし２列分位広
がる傾向がある。When the magnetic brush having the height l is brought into the developing area having the distance d, l <d as shown in FIG.
Therefore, the magnetic brush comes into contact with the surface of the photosensitive drum 1 and bends, and as a result, the developer is present in this area in a uniform and dense state. This development occurs in the entire range in the axial direction, but at both ends in the axial direction, due to the influence at the ends of the magnet 3, the axial length is almost equal to the bent length, that is, 1-d. Direction outwards (first
See figure). In addition to this, in the magnetic brush method, a magnetic brush with a certain width (axial width) is generally affected by vibrations caused by rotation of the developing sleeve before the magnetic brush reaches the developing area. There is a tendency to spread one or two rows of particles.
かかる状況下において、本発明では上記端部規制部材
5,5における現像剤の塗布幅（コーティング幅）すなわ
ち該端部規制部材5,5間の間隔Ｌ′は、感光ドラムの最
大画像幅Ｌよりも小さくしても、上記両端での広がり分
である２（ｌ−ｄ）までならば許容されることを意味し
ている。Under such circumstances, in the present invention, the above-mentioned end portion regulation member
The developer coating width (coating width) in 5, 5 or the distance L'between the end regulating members 5, 5 is smaller than the maximum image width L of the photosensitive drum, but is a spread amount at both ends. It means that up to a certain 2 (ld) is allowed.
すなわち、これを式で示すならば Ｌ−２（ｌ−ｄ）＜Ｌ′＜Ｌ を満足するようにＬ′を設定すればよい。 That is, if this is expressed by an equation, L'may be set so as to satisfy L-2 (ld) <L '<L.
さらに、上記条件のうち具体的に好ましい数値を思い
出したのでこれに示すこととする。Furthermore, among the above-mentioned conditions, a concretely preferable numerical value is recalled, so that it will be shown here.
先ず、磁気ブラシについては、その高さｌがｌ＜0.5m
mの領域では十分な磁性粒子の折曲がり効果が得られ
ず、またｌ≧2.5mmでは中央部の磁性粒子密度が異常に
高まり良好な画像が得られず、0.5≦ｌ≦2.5mm程度の範
囲で良好な結果を得た。一方、感光ドラムと現像スリー
ブとの間隔ｄは、本発明の主旨よりｄ＜ｌでなくてはな
らないが、さらに現像特性からｄ≦750μｍの領域で十
分な濃度、均一性が得られた。First, for magnetic brushes, the height l is l <0.5m
In the region of m, a sufficient bending effect of magnetic particles cannot be obtained, and when l ≧ 2.5 mm, the density of magnetic particles in the central part is abnormally increased and a good image cannot be obtained, and the range of 0.5 ≦ l ≦ 2.5 mm And good results were obtained. On the other hand, the distance d between the photosensitive drum and the developing sleeve must be d <l for the purpose of the present invention. Further, due to the developing characteristics, sufficient density and uniformity were obtained in the region of d ≦ 750 μm.
なお、本発明は画像領域外でのトナーの飛散やドラム
での融着等を防止するもので一般的な電子写真装置に適
応されて効果があるものであるが、特に電子写真装置と
して分離ベルトによる転写紙の強制分離を行なっている
ものではなおさら効果的である。すなわち、現像剤（主
としてキャリア）が感光体に付着することによって、感
光体と分離ベルトとの間に挟まれてはさまれて感光体さ
らには分離ベルトをも傷つけるということがなくなり、
それらの寿命を延ばすこととなる。The present invention prevents the toner from scattering outside the image area and the fusion on the drum, and is effective when applied to a general electrophotographic apparatus. It is even more effective if the transfer paper is forcibly separated by. That is, the developer (mainly the carrier) is not attached to the photoconductor to be sandwiched between the photoconductor and the separation belt to damage the photoconductor and further the separation belt.
It will extend their life.
（発明の効果） 本発明は、潜像担持体と現像剤担持体が間隔をもって
配設されている装置にあって、以上のように現像剤の現
像剤担持体へのコーティング幅を、潜像担持体の最大画
像領域幅よりも狭く、磁気ブラシの高さと上記間隔との
差の２倍を上記最大画像領域幅より引いた値より広く設
定するととしたので、 画像領域において、磁気ブラシを密な状態に確保しつ
つ、該領域端部外への現像剤の飛散を防止し、その結
果、潜像担持体への付着がなくなり画質の低下等の好ま
しくない現象を阻止可能となると共に、特に分離ベルト
を使用する装置にあっては、潜像担持体と分離ベルトを
傷つけることもなくその寿命を延ばすという効果を得
る。(Effects of the Invention) The present invention provides an apparatus in which a latent image bearing member and a developer bearing member are arranged with a gap, and as described above, the coating width of the developer on the developer bearing member Since it is set to be narrower than the maximum image area width of the carrier and wider than the value obtained by subtracting twice the difference between the height of the magnetic brush and the above interval from the maximum image area width, the magnetic brush is set densely in the image area. In this state, it is possible to prevent the developer from scattering to the outside of the end portion of the area, and as a result, it is possible to prevent the undesirable phenomenon such as the deterioration of the image quality due to the lack of adhesion to the latent image bearing member. In the apparatus using the separation belt, it is possible to obtain the effect of extending the life of the latent image carrier and the separation belt without damaging them.
第１図は、本発明の一実施例で潜像担持体と現像剤担持
体の部分を示す正面図、第２図は第１図装置の軸方向端
部を拡大して示す部分斜視図、第３図は第１図装置の現
像領域及び該領域における磁気ブラシを拡大して示す部
分拡大断面図である。 １……潜像担持体（感光ドラム） ２……現像剤担持体（現像スリーブ） ３……磁界発生手段（磁石） ４……規制ブレード ５……端部規制ブレード Ｌ……最大画像領域幅 Ｌ′……コーティング幅 ｌ……磁気ブラシの高さ ｄ……潜像担持体と現像剤担持体との間隔FIG. 1 is a front view showing a latent image carrier and a developer carrier in an embodiment of the present invention, and FIG. 2 is a partial perspective view showing an enlarged axial end portion of the apparatus shown in FIG. FIG. 3 is a partially enlarged sectional view showing the developing region of the apparatus shown in FIG. 1 and the magnetic brush in the region in an enlarged manner. 1 ... Latent image carrier (photosensitive drum) 2 ... Developer carrier (developing sleeve) 3 ... Magnetic field generating means (magnet) 4 ... Regulation blade 5 ... End regulation blade L ... Maximum image area width L '... coating width l ... height of magnetic brush d ... gap between latent image carrier and developer carrier
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭60−126674（ＪＰ，Ａ) 特開 昭62−192768（ＪＰ，Ａ) 実開 昭62−143968（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-126674 (JP, A) JP-A-62-192768 (JP, A) Practical application Sho-62-143968 (JP, U)
Claims (1)
潜像担持体と所定の間隙ｄをもって現像領域を形成しト
ナーとキャリアとを有する現像剤を担持する現像剤担持
体と、現像剤担持体に対して対向配置されて該現像剤担
持体の上記現像領域での現像剤担持幅をＬ′に規制する
規制部材とを有する現像装置において、 現像領域でのキャリアの穂の長さをｌとしたとき、 Ｌ−２（ｌ−ｄ）＜Ｌ′＜Ｌ を満たすことを特徴とする現像装置。1. A latent image carrier having a maximum image area width L, and a developer carrier carrying a developer having a toner and a carrier forming a development area with a predetermined gap d from the latent image carrier. A developing member having a restricting member which is arranged to face the developer carrying member and restricts the developer carrying width of the developer carrying member in the developing area to L ′. A developing device, wherein L-2 (l-d) <L '<L when the length is 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62249956A JPH087497B2 (en) | 1987-10-05 | 1987-10-05 | Development device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62249956A JPH087497B2 (en) | 1987-10-05 | 1987-10-05 | Development device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0192778A JPH0192778A (en) | 1989-04-12 |
| JPH087497B2 true JPH087497B2 (en) | 1996-01-29 |
Family
ID=17200686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62249956A Expired - Lifetime JPH087497B2 (en) | 1987-10-05 | 1987-10-05 | Development device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH087497B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12220078B2 (en) | 2018-11-19 | 2025-02-11 | Different Kettle of Fish Limited | Liquid heating vessels |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60126674A (en) * | 1983-12-13 | 1985-07-06 | Konishiroku Photo Ind Co Ltd | Developing device |
| JPS62143968U (en) * | 1986-03-05 | 1987-09-10 |
-
1987
- 1987-10-05 JP JP62249956A patent/JPH087497B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12220078B2 (en) | 2018-11-19 | 2025-02-11 | Different Kettle of Fish Limited | Liquid heating vessels |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0192778A (en) | 1989-04-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080129 Year of fee payment: 12 |