JPH01243083A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH01243083A JPH01243083A JP63070224A JP7022488A JPH01243083A JP H01243083 A JPH01243083 A JP H01243083A JP 63070224 A JP63070224 A JP 63070224A JP 7022488 A JP7022488 A JP 7022488A JP H01243083 A JPH01243083 A JP H01243083A
- Authority
- JP
- Japan
- Prior art keywords
- grid electrode
- alternating voltage
- developer layer
- electrostatic latent
- developing device
- 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.)
- Pending
Links
- 239000000843 powder Substances 0.000 claims description 2
- 238000005421 electrostatic potential Methods 0.000 claims 1
- 230000005684 electric field Effects 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 238000002156 mixing Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 241001600434 Plectroglyphidodon lacrymatus Species 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、現像装置に関し、より詳しくは電子写真等の
現像装置において絶縁性磁性トナーを使用する一成分非
接触現像装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a developing device, and more particularly to a one-component non-contact developing device that uses an insulating magnetic toner in a developing device such as an electrophotographic device.
［従来の技術］
従来、電子写真の現像装置としては、例えば米国特許第
２８７４０６３号明細書、米国特許第２２２１７７６号
明細書、米国特許第２９０２９７４号明細書等に記載さ
れている磁気ブラシ方法、カスケード方法、パウダーク
ラウド方法およびファ−ブラシ方法等に基づく多数の現
像装置が知られている。これらの現像装置においては、
何れも比較的に安定でありかつ画質の優れた画像が簡単
に得られるものである。[Prior Art] Conventionally, electrophotographic developing devices include a magnetic brush method and a cascade method, which are described in, for example, U.S. Pat. No. 2,874,063, U.S. Pat. No. 2,221,776, and U.S. Pat. A large number of development devices are known based on methods such as the powder cloud method and the fur brush method. In these developing devices,
All of these methods are relatively stable and can easily provide images with excellent image quality.
［発明が解決しようとする課題］
しかし、以上の現像方法に基づく現像装置では優れた特
徴がある反面、二成分系の現像剤を用いることによる共
通した欠点を有している。即ち、トナーとキャリアの相
互ＨＩＭによりトナーは電荷を得ることができるが、キ
ャリア表面へトナーの組成物付着が発生し、トナーの帯
電量の劣化を起こすこと、安定した現像をするためにト
ナーとキャリアの混合比は所定の範囲に調整されなけれ
ばならないが、長期間の使用によって上記混合比が変動
し所定の範囲から外れてしまうこと、また所定の範囲か
ら外れないようにするためにトナー濃度コントロール機
構が必要なこと、キャリア剤として数十ミクロン径の鉄
粉やガラスピーズを用いるが、これが静電潜像保持体（
例えば感光ドラム等）の表面を擦過する際、機械的に損
傷してしまうこと、現像器が比較的大きくなってしまう
こと等が挙げられる。[Problems to be Solved by the Invention] However, although the developing devices based on the above-described developing methods have excellent features, they also have common drawbacks due to the use of two-component developers. In other words, the toner can obtain a charge due to mutual HIM between the toner and the carrier, but the toner composition may adhere to the carrier surface, causing deterioration of the charge amount of the toner. The mixing ratio of the carrier must be adjusted within a predetermined range, but the mixing ratio may fluctuate and deviate from the predetermined range due to long-term use. A control mechanism is required, and iron powder or glass beads with a diameter of several tens of microns are used as a carrier agent, but this is not the case with electrostatic latent image carriers (
For example, when the surface of a photosensitive drum (such as a photosensitive drum) is scratched, it may be mechanically damaged, and the developing device may become relatively large.
以上の欠点を回避するため、現像剤としてトナーだけか
らなる一成分現像方法が各種提案されている。例えば、
米国特許第３１５２０１２号明細書、米国特許第３７３
１１４６号明細書等に記載されているインプレッション
現像方法がある。これは現像剤層担持体であるインプレ
ッションローラーの表面にバネによって支持されたドク
ターブレードを接触させてインプレッションローラー上
にトナー層を形成しようというものであり、材質の摩擦
帯電系列が、ドクターブレード ≦ インプレッション
ロラー （トナーになるように選択される。しかし、以
上の現像方法に基づく現像装置では、トナーが帯電した
絶縁性トナーであると共に静電潜像保持体（例えば感光
ドラム等）に接触しているために地かぶりを生じやすい
こと、現像剤層担持体と潜像面を接触させる場合の機械
的設定が難しい等の課題を有している。本発明はかかる
課題を解決するもので、その目的とするところは、−成
分現像方法に基づく現像装置でありながら、現像剤層担
持体と静電潜像面が非接触でかつ設定が容易であり、二
成分現像と同等の画像品質を得ることができる現像装置
を提供するところにある。In order to avoid the above drawbacks, various one-component development methods using only toner as a developer have been proposed. for example,
U.S. Patent No. 3152012, U.S. Patent No. 373
There is an impression development method described in the specification of No. 1146 and the like. This is to form a toner layer on the impression roller by bringing a doctor blade supported by a spring into contact with the surface of the impression roller, which is a developer layer carrier. However, in the developing device based on the above developing method, the toner is a charged insulating toner and is in contact with an electrostatic latent image carrier (for example, a photosensitive drum). Therefore, there are problems such as background fog is likely to occur, and mechanical setting is difficult when bringing the developer layer carrier into contact with the latent image surface. Although it is a developing device based on a -component development method, the developer layer carrier and the electrostatic latent image surface are not in contact with each other, and the setting is easy, and image quality equivalent to that of two-component development can be obtained. The goal is to provide a developing device that can.
［課題を解決するための手段］
本発明の現像装置は、内部に互いに異極性の磁極を外周
面に交互に着磁した回転する磁石を含む現像剤層担持体
とグリッド電極と交番電圧を印加する手段を有し、前記
グリッド電極は前記現像剤層担持体の現像剤層の厚みよ
りも大きな現像間隙を保持して静電潜像保持体との間に
設置せしめた現像装置であって、前記現像剤層担持体と
前記グリッド電極の間に第１の交番電圧を印加する手段
を設けると共に前記グリッド電極と前記静電潜像保持体
との間に、前記第１の交番電圧印加手段による交番電圧
の位相と同相の交番電圧を印加する第２の交番電圧印加
手段を設けたことを特徴とし、また現像剤は絶縁性磁性
トナーであることを特徴とする。さらに現像剤層担持体
とグリッド電極の間に直流バイアス電圧を印加する手段
を設けたことを特徴とする。[Means for Solving the Problems] The developing device of the present invention applies an alternating voltage to a developer layer carrier containing rotating magnets whose outer peripheral surfaces are alternately magnetized with magnetic poles of different polarity, and a grid electrode. A developing device, wherein the grid electrode is installed between the electrostatic latent image carrier and the electrostatic latent image carrier while maintaining a development gap larger than the thickness of the developer layer of the developer layer carrier, A means for applying a first alternating voltage is provided between the developer layer carrier and the grid electrode, and a means for applying a first alternating voltage is provided between the grid electrode and the electrostatic latent image holder. The present invention is characterized in that a second alternating voltage applying means for applying an alternating voltage having the same phase as the alternating voltage is provided, and the developer is an insulating magnetic toner. Furthermore, the present invention is characterized in that means for applying a DC bias voltage between the developer layer carrier and the grid electrode is provided.
［作用］
本発明の上記の構成によれば、絶縁性磁性トナーは、現
像剤層担持体上を内部にあって互いに異極性の磁極を外
周面に交互に着磁した磁石を回転す ・ることで、回転
方向と逆方向に現像剤層担持体の表面上を移動すること
ができる。この際、絶縁性磁性トナーは現像剤層担持体
の表面との摩擦作用、若しくは現像剤層の厚み規制用の
ブレードとの摩擦作用、又は何らかの方法（例えばコロ
トロ・ン照射等）で帯電される。現像領域において、帯
電された絶縁性磁性トナーは、まず現像剤層担持体とグ
リッド電極との間に第１の交番電圧を印加することで発
生する電界によってグリッド電極まで飛翔する。さらに
グリッド電極と静電潜像保持体との間には第１の交番電
圧と位相を同じくして第２の交番電圧を印加するため、
グリッド電極まで飛翔した絶縁性磁性トナーは静電潜像
保持体に向かって加速される。静電潜像保持体の画像部
においては静電力によって、絶縁性磁性トナーが付着し
現像される。非画像部においては、印加される第１、第
２の交番電圧による電界が今度は静電潜像保持体からグ
リッド電極、さらには現像剤層担持体に向かうため、絶
縁性磁性トナーは飛翔し現像剤層担持体に付着する。電
界が交互に変化するため、現像領域において絶縁性磁性
トナーが、現像剤層担持体と静電ン替像保持体の間を往
復運動し現像することができる。現像に寄与しない絶縁
性磁性トナーは、現像領域を通過して、現像剤層担持体
の内部にある磁石の磁力によって現像剤層担持体上に引
きつけられたまま移動する。[Function] According to the above configuration of the present invention, the insulating magnetic toner rotates the magnet which is located inside and has magnetic poles of different polarity alternately magnetized on the outer peripheral surface on the developer layer carrier. This allows the developer layer to move on the surface of the developer layer carrier in a direction opposite to the rotational direction. At this time, the insulating magnetic toner is charged by frictional action with the surface of the developer layer carrier, frictional action with a blade for regulating the thickness of the developer layer, or some other method (for example, corotron irradiation, etc.). . In the development area, the charged insulating magnetic toner flies to the grid electrode by an electric field generated by applying a first alternating voltage between the developer layer carrier and the grid electrode. Furthermore, since a second alternating voltage is applied between the grid electrode and the electrostatic latent image holder in the same phase as the first alternating voltage,
The insulating magnetic toner that has flown to the grid electrode is accelerated toward the electrostatic latent image carrier. Insulating magnetic toner is attached to the image area of the electrostatic latent image holder by electrostatic force and developed. In the non-image area, the electric field caused by the applied first and second alternating voltages is directed from the electrostatic latent image holder to the grid electrode and then to the developer layer holder, so that the insulating magnetic toner does not fly away. The developer layer adheres to the carrier. Since the electric field changes alternately, the insulating magnetic toner can be developed by reciprocating between the developer layer carrier and the electrostatic image carrier in the development area. The insulating magnetic toner that does not contribute to development passes through the development area and moves while being attracted onto the developer layer carrier by the magnetic force of the magnet inside the developer layer carrier.
［実施例コ 以下、本発明の実施例を図面に基づき詳細に説明する。[Example code] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
第１図は本発明の現像装置におけるグリ・ソド電極の構
成を示す図である。グリッド電極１は互いに２ｍｍの間
隙を設けて、プラスチックよりなる支持部材２にテンシ
ョンをかけられて取付けられており、共通端子３によっ
て押さえられている。FIG. 1 is a diagram showing the configuration of a grid electrode in a developing device of the present invention. The grid electrodes 1 are attached under tension to a support member 2 made of plastic with a gap of 2 mm between them, and are held down by a common terminal 3.
グリッド電極１は導電性でかつ引っ張り強度のある材料
が望ましく、本実施例では直径８０μｍのステンレスワ
イヤーを用いた。外部電源によって共通端子３に交番電
圧が印加される。第２図は本発明の現像装置の第１の実
施例の概略を示す図である。絶縁性磁性トナー４は、ポ
リエチレン樹脂、アクリル系樹脂、エポキシ系樹脂、ポ
リエステル系樹脂、あるいはその共重合体等の樹脂の中
に、カーボンブラックを配合し、さらに磁性材料を４０
〜６０重量％の割合で混合、粉砕、分級されたものであ
る。静電潜像保持体としては、アルミニウム素管５上に
光導電体６を形成してなる感光ドラム７を用いた。現像
剤層担持体は、互いに異極性の磁極を外周面に交互に着
磁したマグローラ８と、例えばステンレスによって円筒
状に形成されたスリーブ９により構成されている。マグ
ローラ８は対称８極配置に磁極を構成している。現像剤
ホッパー１０から絶縁性磁性トナー４が供給されるが、
絶縁性磁性トナー４はマグローラ８を図中矢印Ａの方向
に回転することによりスリーブ９の表面上を図中矢印Ｂ
の方向へ搬送される。絶縁性磁性トナー４はドクターブ
レード１１によってトナー層の厚みを規制されるばかり
でなく、摩擦帯電作用により帯電される。帯電の際、極
性はドクターブレード１１と絶縁性磁性トナー４の材質
の摩擦帯電系列によって決定される。スリーブ９と感光
ドラム７はドクターブレード１１によって規制さ九るト
ナー層の厚みよりも大きな現像ギャップＧを設けて対向
されており、グリッド電極１は現像ギャップＧのほぼ中
間に配置している。スリーブ９とグリッド電極１の間に
は外部電源１２−１のより交番電圧が印加され、グリッ
ド電極１と感光ドラム７の間には外部電源１２−１によ
る交番電圧の位相と同相の交番電圧を印加する第２の外
部電源１２−２が設けられている。本実施例では８００
■（ピーク・トウ・ピーク値）の交番電圧を１０〜１０
００Ｈｚの周波数で印加している。感光ドラム７は予め
表面電を−６００〜−８００Ｖに帯電され、レーザー等
の光り書き込み系（図示せず）によって潜像を形成しな
がら図中矢印Ｃの方向へ、６０ｍｍ／秒のスピードで回
転している。The grid electrode 1 is preferably made of a material that is conductive and has tensile strength, and in this example, a stainless steel wire with a diameter of 80 μm was used. An alternating voltage is applied to the common terminal 3 by an external power supply. FIG. 2 is a diagram schematically showing a first embodiment of the developing device of the present invention. The insulating magnetic toner 4 is made by blending carbon black into a resin such as polyethylene resin, acrylic resin, epoxy resin, polyester resin, or a copolymer thereof, and further adding 40% of a magnetic material.
It was mixed, crushed, and classified at a ratio of ~60% by weight. As the electrostatic latent image holder, a photosensitive drum 7 having a photoconductor 6 formed on an aluminum tube 5 was used. The developer layer carrier is composed of a mag roller 8 whose outer peripheral surface is alternately magnetized with magnetic poles of different polarity, and a sleeve 9 made of, for example, stainless steel and formed into a cylindrical shape. The magnetic roller 8 has magnetic poles arranged in a symmetrical eight-pole arrangement. The insulating magnetic toner 4 is supplied from the developer hopper 10.
By rotating the magnetic roller 8 in the direction of the arrow A in the figure, the insulating magnetic toner 4 moves on the surface of the sleeve 9 in the direction of the arrow B in the figure.
It is transported in the direction of. The thickness of the toner layer of the insulating magnetic toner 4 is not only regulated by the doctor blade 11, but also charged by frictional charging. During charging, the polarity is determined by the triboelectrification series of the materials of the doctor blade 11 and the insulating magnetic toner 4. The sleeve 9 and the photosensitive drum 7 face each other with a developing gap G larger than the thickness of the toner layer regulated by a doctor blade 11, and the grid electrode 1 is disposed approximately in the middle of the developing gap G. An alternating voltage from an external power source 12-1 is applied between the sleeve 9 and the grid electrode 1, and an alternating voltage having the same phase as the alternating voltage from the external power source 12-1 is applied between the grid electrode 1 and the photosensitive drum 7. A second external power source 12-2 is provided to apply the voltage. In this example, 800
■(Peak-to-peak value) alternating voltage of 10 to 10
It is applied at a frequency of 00Hz. The photosensitive drum 7 is charged with a surface charge of -600 to -800 V in advance, and is rotated at a speed of 60 mm/sec in the direction of arrow C in the figure while forming a latent image using a light writing system (not shown) such as a laser. are doing.
現像領域において正帯電した絶縁性磁性トナー４は、交
番電界のまずスリーブ９からグリッド電極１へ向かう電
界に沿って、現像ギャップＧを飛翔しグリッド電極１か
ら感光ドラム７に向かう電界によって加速され、感光ド
ラム７上に到達する。The positively charged insulating magnetic toner 4 in the development region flies through the development gap G along the alternating electric field that first goes from the sleeve 9 to the grid electrode 1, and is accelerated by the electric field that goes from the grid electrode 1 to the photosensitive drum 7. It reaches onto the photosensitive drum 7.
続いて交番電界の向きが感光ドラム７からグリッド電極
１へ変わると電界による力がスリーブ方向へ働くことに
なる。この時、画像部においては絶縁性磁性トナー４は
静電力によって感光ドラム上に残ったまま現像され、非
画像部においては、再び現像ギャップＧを飛翔しスリー
ブ上に付着する。Subsequently, when the direction of the alternating electric field changes from the photosensitive drum 7 to the grid electrode 1, a force due to the electric field acts in the direction of the sleeve. At this time, in the image area, the insulating magnetic toner 4 is developed while remaining on the photosensitive drum due to electrostatic force, and in the non-image area, it flies through the development gap G again and adheres to the sleeve.
外部電源１２−１．１２−２によって電界の向きが一定
の周期で変化するため、絶縁性磁性トナー４は現像領域
りにおいて往復運動を繰り返し現像される。現像に寄与
しない絶縁性磁性トナーは現像領域を通過するに従って
、マグローラ８の磁力によってスリーブ９上に引きつけ
られたまま現像剤ホッパー１０の中へ移動していく。即
ち、感光ドラム上の画像部においては、ドツト抜けのな
い良好な画像を形成することができｍ線の再現性もよく
、また非画像部においては地力ブリを少なくすることが
できる。さらにスリーブとグリッド電極間、及びグリッ
ド電極と感光ドラム間に交番電圧を印加するため現像ギ
ャップＧは従来のニ成分現像に比べて約２倍の広さにす
ることができる。Since the direction of the electric field is changed at regular intervals by the external power source 12-1, 12-2, the insulating magnetic toner 4 is developed by repeatedly moving back and forth in the development area. As the insulating magnetic toner that does not contribute to development passes through the development area, it moves into the developer hopper 10 while being attracted onto the sleeve 9 by the magnetic force of the mag roller 8. That is, in the image area on the photosensitive drum, a good image without missing dots can be formed, and the reproducibility of the m-line is also good, and in the non-image area, ground blur can be reduced. Furthermore, since an alternating voltage is applied between the sleeve and the grid electrode and between the grid electrode and the photosensitive drum, the development gap G can be made about twice as wide as in conventional two-component development.
第３図は本発明の現像装置の第２の実施例の概略を示す
図であり、第１の実施例に示した構成の中で、スリーブ
９とグリッド電極１の間に直流バイアス電圧（以下ＶＢ
と称す）を印加する第３の外部電源１３を加えている。FIG. 3 is a diagram schematically showing a second embodiment of the developing device of the present invention. In the configuration shown in the first embodiment, a DC bias voltage (hereinafter referred to as VB
A third external power source 13 is added which applies a voltage (referred to as . . . ).
第４図は直流バイアス電圧を加えた時の感光ドラムの表
面電位の様子を示す図である。（ａ）は反転現像の場合
であり、（ｂ）は正転現像の場合である。同図（ａ）に
おいて感光ドラム１０表面は一６００ｖに帯電されてお
りＶＢは一４５０Ｖ印加されて、光書き込みされた画像
部りに絶縁性磁性トナーが付着しやすく、非画像部Ｅに
は地力ブリが発生しすらくなっている。同図（ｂ）にお
いてはＶＢは一１５０■印加されて光書き込みされてい
ない画像部りには絶縁性磁性トナーが付着しやすく非画
像部Ｅには地力ブリが発生しずらくなっている。FIG. 4 is a diagram showing the surface potential of the photosensitive drum when a DC bias voltage is applied. (a) is the case of reverse development, and (b) is the case of normal development. In the same figure (a), the surface of the photosensitive drum 10 is charged to -600V, and VB is applied to -450V, so that insulating magnetic toner tends to adhere to the optically written image area, and the non-image area E has a magnetic force. Yellowtail is even starting to appear. In FIG. 5(b), VB is applied at -150 cm, and the insulating magnetic toner tends to adhere to the image area where optical writing is not performed, making it difficult for ground force blur to occur in the non-image area E.
第１、第２の実施例の中で表面電位を負帯電、絶縁性磁
性トナーを正帯電として説明してきたが、本発明はこれ
に限られるものではなく逆の極性であっても構わない。In the first and second embodiments, the surface potential has been described as being negatively charged and the insulating magnetic toner being positively charged, but the present invention is not limited to this and may be of opposite polarity.
［発明の効果］
以上述べたように、本発明における現像装置は−成分現
像でありながら、現像剤層担持体と静電潜像保持体の間
隙を大きくとることができ、現ｆｆｆｉ剤層担持体と静
電潜像保持体の設定の容易な非接触現像を実現でき、か
つかぶり等の少ない画像を得ることができた。さらに、
現像領域において現像剤が飛翔するため、現像剤層担持
体への現像剤の付着に伴う現像装置の劣化も防止できる
と共に、静電潜像保持体の機械的な損傷等を防止する効
果。[Effects of the Invention] As described above, although the developing device of the present invention performs -component development, the gap between the developer layer carrier and the electrostatic latent image carrier can be made large, and the developer layer carrying It was possible to realize non-contact development with easy setting of the body and the electrostatic latent image holder, and to obtain images with little fogging. moreover,
Since the developer flies in the developing area, it is possible to prevent deterioration of the developing device due to adhesion of the developer to the developer layer carrier, and also to prevent mechanical damage to the electrostatic latent image carrier.
を有する。has.
第１図は本発明の現像装置におけるグリッド電極の構成
を示す図、第２図は本発明の現像装置の第１の実施例の
概略を示す図、第３図は本発明の現像装置の第２の実施
例の概略を示す図、第４図（ａ）は本発明の第２の実施
例において反転現像の場合の感光ドラムの表面電位の様
子を示す図、（ｂ）は正転現像の場合の感光ドラムの表
面電位の様子を示す図である。
１ ニゲリッド電極
２ ：支持部材
３ ：共通端子
４ ：絶縁性磁性トナー
５ ニアルミニウム素管
６ ；光導電体
７ ：感光ドラム
８ ：マグローラー
９ ニスリーブ
１０ ：現像剤ホッパー
１１ ：ドクターブレード
１２−１：第１の外部電源
１２−２：第２の外部電源
１３ ：第３の外部電源
以上
出願人 セイコーエプソン株式会社第１図
第３０FIG. 1 is a diagram showing the configuration of a grid electrode in the developing device of the present invention, FIG. 2 is a diagram schematically showing the first embodiment of the developing device of the present invention, and FIG. 3 is a diagram showing the configuration of the grid electrode in the developing device of the present invention. 4(a) is a diagram showing the surface potential of the photosensitive drum in the case of reverse development in the second embodiment of the present invention, and FIG. 4(b) is a diagram showing the state of the surface potential of the photosensitive drum in the case of reverse development in the second embodiment of the present invention. FIG. 3 is a diagram showing the state of the surface potential of the photosensitive drum in the case of FIG. 1 Nigellid electrode 2 : Support member 3 : Common terminal 4 : Insulating magnetic toner 5 Nialium tube 6 ; Photoconductor 7 : Photosensitive drum 8 : Mag roller 9 Nisleeve 10 : Developer hopper 11 : Doctor blade 12-1: First external power source 12-2: Second external power source 13: Third external power source and above Applicant: Seiko Epson Corporation, Figure 1, Figure 30
Claims (3)
剤で顕像化する現像装置において、内部に互いに異極性
の磁極を外周面に交互に着磁した回転する磁石を含む現
像剤層担持体とグリッド電極と交番電圧を印加する手段
を有し、前記グリッド電極は前記現像剤層担持体の現像
剤層の厚みよりも大きな現像間隙を保持して前記静電潜
像保持体との間に設置せしめた現像装置であって、前記
現像剤層担持体と前記グリッド電極の間に第１の交番電
圧印加手段を設け、さらに前記グリッド電極と前記静電
潜像保持体との間に、前記第１の交番電圧印加手段によ
る交番電圧の位相と同相の交番電圧を印加する第２の交
番電圧印加手段を設けたことを特徴とする現像装置。(1) In a developing device that visualizes an electrostatic latent image carrier carrying an electrostatic latent image using a powder developer, a rotating magnet internally has magnetic poles of different polarity alternately magnetized on its outer circumferential surface. means for applying an alternating voltage to a developer layer carrier and a grid electrode, and the grid electrode maintains a development gap larger than the thickness of the developer layer of the developer layer carrier to increase the electrostatic potential. A developing device installed between the developer layer carrier and the grid electrode, the developing device being provided with a first alternating voltage applying means between the developer layer carrier and the grid electrode, and further comprising a first alternating voltage applying means between the grid electrode and the electrostatic latent image holding member. A developing device characterized in that a second alternating voltage applying means for applying an alternating voltage having the same phase as the alternating voltage applied by the first alternating voltage applying means is provided between the developing device and the first alternating voltage applying means.
する請求項１記載の現像装置。(2) The developing device according to claim 1, wherein the developer is an insulating magnetic toner.
直流バイアス電圧を印加する手段を設けたことを特徴と
する請求項１記載の現像装置。(3) The developing device according to claim 1, further comprising means for applying a DC bias voltage between the developer layer carrier and the grid electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63070224A JPH01243083A (en) | 1988-03-24 | 1988-03-24 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63070224A JPH01243083A (en) | 1988-03-24 | 1988-03-24 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01243083A true JPH01243083A (en) | 1989-09-27 |
Family
ID=13425365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63070224A Pending JPH01243083A (en) | 1988-03-24 | 1988-03-24 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01243083A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0424180A2 (en) * | 1989-10-20 | 1991-04-24 | Xerox Corporation | Printing apparatus |
| EP0432998A2 (en) * | 1989-12-11 | 1991-06-19 | Xerox Corporation | Dual AC development system |
| US5270483A (en) * | 1992-03-31 | 1993-12-14 | Fuji Xerox Co., Ltd. | Developing apparatus |
-
1988
- 1988-03-24 JP JP63070224A patent/JPH01243083A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0424180A2 (en) * | 1989-10-20 | 1991-04-24 | Xerox Corporation | Printing apparatus |
| EP0432998A2 (en) * | 1989-12-11 | 1991-06-19 | Xerox Corporation | Dual AC development system |
| US5270483A (en) * | 1992-03-31 | 1993-12-14 | Fuji Xerox Co., Ltd. | Developing apparatus |
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