JP2003066716A - Developing device - Google Patents
Developing deviceInfo
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- JP2003066716A JP2003066716A JP2001254889A JP2001254889A JP2003066716A JP 2003066716 A JP2003066716 A JP 2003066716A JP 2001254889 A JP2001254889 A JP 2001254889A JP 2001254889 A JP2001254889 A JP 2001254889A JP 2003066716 A JP2003066716 A JP 2003066716A
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- voltage
- developer
- developing
- regulating member
- current value
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- Developing Agents For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複写機、プリン
タ、ＦＡＸ等の電子写真装置或は静電記録装置の現像装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device for an electrophotographic device such as a copying machine, a printer, a fax machine or an electrostatic recording device.
【０００２】[0002]
【従来の技術】従来、複写装置や画像記録装置、プリン
タ、ファクシミリ等の画像形成装置においては、電子写
真感光体や静電記録誘電体等から成る。潜像担持体上に
形成した静電潜像を現像装置により現像してトナー像と
して可視化している。このような現像装置の１つとし
て、現像剤として非磁性トナーの現像剤を使用した現像
装置が種々発案され、既に実用化されている。2. Description of the Related Art Conventionally, an image forming apparatus such as a copying machine, an image recording apparatus, a printer or a facsimile is composed of an electrophotographic photosensitive member or an electrostatic recording dielectric. The electrostatic latent image formed on the latent image carrier is developed by a developing device to be visualized as a toner image. As one of such developing devices, various developing devices using a non-magnetic toner developer as a developer have been proposed and have been put into practical use.
【０００３】例えば、特開昭５４−４３０３８号に示さ
れているように、現像剤担持体としての現像スリーブの
表面に現像剤規制部材としてのゴム又は金属製の現像ブ
レードを当接させ、この現像ブレードと現像スリーブと
の当接部の間を非磁性トナーを通過させて規制すること
によって現像スリーブ上にトナーの薄層を形成し、且
つ、当接部での摩擦でトナーに十分な摩擦帯電電荷を付
与させる装置がある。For example, as shown in Japanese Patent Laid-Open No. 54-43038, a developing blade made of rubber or metal as a developer regulating member is brought into contact with the surface of a developing sleeve as a developer carrying member. A thin layer of toner is formed on the developing sleeve by restricting the non-magnetic toner by passing between the abutting portion of the developing blade and the developing sleeve, and the friction at the abutting portion causes sufficient friction to the toner. There is a device for applying a charge.
【０００４】上記非磁性トナーを使用する現像装置は、
現像スリーブ上にトナーを供給するトナー供給部材が別
途必要となる。これは、磁性トナーの場合は、現像スリ
ーブ内の磁石の磁力により現像スリーブ上にトナーを供
給することができるが、非磁性トナーの場合には磁力に
よるトナーの供給が行えないためである。A developing device using the above non-magnetic toner is
A toner supply member for supplying toner onto the developing sleeve is required separately. This is because in the case of magnetic toner, the toner can be supplied onto the developing sleeve by the magnetic force of the magnet in the developing sleeve, but in the case of non-magnetic toner, the toner cannot be supplied by the magnetic force.
【０００５】即ち、図１に示すように、一成分現像装置
４は非磁性トナー８を収容した現像容器１５内に、現像
ブレード１３よりも現像スリーブ１０の回転方向上流側
の位置で現像スリーブ１０に当接するトナー供給ローラ
１４を配置し、これをＤ方向に回転する現像スリーブ１
０に対してＥ方向（対向部が逆方向に移動する向き）に
回転することにより、容器１５内の撹拌部材２０により
搬送された非磁性トナー８を現像スリーブ１０上に供給
して担持させるものである。That is, as shown in FIG. 1, in the one-component developing device 4, the developing sleeve 10 is accommodated in the developing container 15 containing the non-magnetic toner 8 at a position upstream of the developing blade 13 in the rotational direction of the developing sleeve 10. The toner supply roller 14 that comes into contact with the developing sleeve 1 that rotates in the D direction is disposed.
The non-magnetic toner 8 conveyed by the stirring member 20 in the container 15 by being rotated in the E direction (direction in which the facing portion moves in the opposite direction) with respect to 0 is supplied and carried on the developing sleeve 10. Is.
【０００６】現像スリーブ１０上に担持されたトナー８
は、その後、現像スリーブ１０の回転に伴い現像ブレー
ド１３との当接部へ送られ、そこで薄層化された後、感
光ドラム１と対向した現像部に搬送され、感光ドラム１
上の静電潜像の現像に供される。現像スリーブ１０上に
供されないで残存したトナー８は、現像スリーブ１０に
より現像容器１５内に戻され、トナー供給ローラ１４に
より現像スリーブ１０の表面から剥ぎ取られた後、撹拌
部材２０により他のトナー８と混合され、その後、上述
したように、トナー供給ローラ１４による現像スリーブ
１０への供給が繰り返される。Toner 8 carried on developing sleeve 10
Then, the toner is sent to the contact portion with the developing blade 13 as the developing sleeve 10 rotates, is thinned there, and then is conveyed to the developing portion facing the photosensitive drum 1.
It is used for developing the above electrostatic latent image. The toner 8 remaining on the developing sleeve 10 is returned to the inside of the developing container 15 by the developing sleeve 10, is peeled off from the surface of the developing sleeve 10 by the toner supply roller 14, and is then agitated by another toner by the stirring member 20. 8 and then the toner supply roller 14 repeatedly supplies the developing sleeve 10 with the toner as described above.
【０００７】又、トナー８により効率的に電荷を与える
方法として、トナー母粒子に帯電補助剤を外添する方法
があり、帯電補助剤としてはトナー母粒子と帯電系列で
同極性の微粒子と、更にトナー母粒子とトナー母粒子と
同極性の微粒子をより帯電させるため、トナー母粒子と
逆極性の微粒子が用いられる。この作用が効果的に行わ
れるためには粒子径が、トナー母粒子＞トナー母粒子と
逆極性の微粒子＞トナー母粒子と同極性の微粒子の順で
あることが望ましく、このように２種類以上の微粒子を
トナー母粒子に外添をすることは良く行われている。Further, as a method for efficiently giving an electric charge to the toner 8, there is a method of externally adding a charging auxiliary agent to the toner mother particles, and the charging auxiliary agent is fine particles having the same polarity in the charging series as the toner mother particles, Further, in order to further charge the toner mother particles and the fine particles having the same polarity as the toner mother particles, fine particles having the opposite polarity to the toner mother particles are used. In order to effectively perform this action, it is desirable that the particle diameters are in the order of toner base particles> fine particles having a polarity opposite to that of the toner base particles> fine particles having the same polarity as the toner base particles. It is common practice to externally add these fine particles to the toner base particles.
【０００８】近年、画像をデジタル化して扱うコンピュ
ータ等での画像の需要が増し、これに伴いより高精細で
高品位な画像が要求され、更にはより低価格な画像形成
装置が求められている。In recent years, there has been an increasing demand for images in computers and the like that handle digitalized images, and as a result, higher definition and higher quality images are required, and further, lower cost image forming apparatuses are required. .
【０００９】このような要求に応えるために、現像ブレ
ード１３の材質としては加工が比較的困難で高価なゴム
製品よりも加工の容易で安価な金属製薄板を使用するこ
とが望ましく、これにより画像形成装置の低価格と高画
質の両立が図られる。In order to meet such demands, it is desirable to use a thin metal plate which is easy to process and inexpensive as a material of the developing blade 13 as compared with an expensive rubber product which is relatively difficult to process. It is possible to achieve both low cost and high image quality of the forming apparatus.
【００１０】[0010]
【発明が解決しようとする課題】しかしながら、本発明
者等が現像ブレード１３に金属製薄板を使用し、現像ブ
レード１３と現像スリーブ１０を同電位にして現像装置
４の構成で検討を行ったところ、現像操作を多数回繰り
返した場合、 現像ブレード１３と現像スリーブ１０の当
接するニップ部分においてトナー８が現像ブレード１３
に固着してしまい、これにより現像スリーブ１０上の長
手方向に均一なトナーコーティングを阻害し、画像とし
ては縦スジ状の欠陥が発生してしまった。However, the inventors of the present invention conducted a study on the structure of the developing device 4 using a thin metal plate for the developing blade 13 and setting the developing blade 13 and the developing sleeve 10 at the same potential. When the developing operation is repeated a large number of times, the toner 8 is removed from the developing blade 13 at the nip portion where the developing blade 13 and the developing sleeve 10 contact each other.
The toner adheres to the surface of the developing sleeve 10, which hinders uniform toner coating in the longitudinal direction on the developing sleeve 10, resulting in vertical stripe defects in the image.
【００１１】本発明は上記問題に鑑みてなされたもの
で、その目的とする処は、現像剤担持体上にトナー薄層
形成を安定して良好に行うことができる現像装置を提供
することにある。The present invention has been made in view of the above problems, and an object of the present invention is to provide a developing device capable of stably and favorably forming a thin toner layer on a developer carrying member. is there.
【００１２】[0012]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、現像剤と、該現像剤を担持して搬送する
回転可能な現像剤担持体と、該現像剤担持体に当接して
現像剤を規制する導電性現像剤規制部材と、現像剤担持
体と前記導電性現像剤規制部材との間に直流電界を発生
させる電圧印加手段と、該電圧印加手段と現像剤担持体
の回転を制御する制御装置と、前記現像剤規制部材に流
れる電流値を測定する電流値測定装置と、該電流値測定
装置による測定値を解析して適切な電気信号を前記制御
装置に送る計算機と、を有する現像装置において、前記
電圧印加手段が漸次可変するように電圧を前記導電性現
像剤規制部材に印加して該導電性現像剤規制部材に流れ
る電流を前記電流値測定装置によって測定し、測定値か
ら特定の電圧を前記計算機で選択し、この選択された電
圧を導電性現像剤規制部材に印加するように前記制御装
置によって電圧印加手段を作動させることを特徴とす
る。In order to achieve the above object, the present invention provides a developer, a rotatable developer carrier for carrying and carrying the developer, and an abutting member for contacting the developer carrier. Of a conductive developer regulating member for regulating the developer by means of a voltage applying means for generating a DC electric field between the developer carrying member and the conductive developer regulating member, and the voltage applying means and the developer carrying member. A control device for controlling rotation, a current value measuring device for measuring a current value flowing in the developer regulating member, and a computer for analyzing a measurement value by the current value measuring device and sending an appropriate electric signal to the control device. In the developing device having, a voltage is applied to the conductive developer restricting member so that the voltage applying unit is gradually changed, and a current flowing through the conductive developer restricting member is measured by the current value measuring device, The specific voltage from the measured value Select San machine, characterized in that actuating the voltage applying means by said control device so as to apply the selected voltage to the conductive developer regulating member.
【００１３】[0013]
【発明の実施の形態】以下に本発明の実施の形態を添付
図面に基づいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１４】＜実施の形態１＞図２は本発明に係る現像
装置を備える画像形成装置要部の断面図であり、同図に
おいて、１は矢印Ａ方向に回転する像担持体としての感
光ドラムであり、該感光ドラム１の周りには、感光ドラ
ム１表面を帯電するための不図示の電源装置によって帯
電バイアスが印加された矢印Ｂ方向に回転する帯電ロー
ラ２、感光ドラム１表面に静電潜像を形成するための露
光装置３、感光ドラム１表面の静電潜像上にトナー像を
形成するための現像装置４、感光ドラム１表面のトナー
像を転写材Ｐに転写するための転写ローラ５、転写材Ｐ
に転写されないで感光ドラム１表面に残ったトナーを回
収し、感光ドラム１表面を清掃するためのクリーニング
装置６が設けられている。<Embodiment 1> FIG. 2 is a sectional view of an essential part of an image forming apparatus provided with a developing device according to the present invention. In FIG. 2, 1 is a photosensitive drum as an image carrier which rotates in the direction of arrow A. Around the photosensitive drum 1, a charging roller 2 that rotates in the direction of arrow B to which a charging bias is applied by a power supply device (not shown) for charging the surface of the photosensitive drum 1 and the surface of the photosensitive drum 1 are electrostatically charged. An exposure device 3 for forming a latent image, a developing device 4 for forming a toner image on the electrostatic latent image on the surface of the photosensitive drum 1, and a transfer for transferring the toner image on the surface of the photosensitive drum 1 to a transfer material P. Roller 5, transfer material P
A cleaning device 6 is provided for collecting the toner remaining on the surface of the photosensitive drum 1 without being transferred to the surface of the photosensitive drum 1 and cleaning the surface of the photosensitive drum 1.
【００１５】次に、現像装置４について図２を用いて説
明する。Next, the developing device 4 will be described with reference to FIG.
【００１６】本実施の形態では、現像方式として非磁性
一成分接触現像方式を用いた。現像剤担持体としての現
像スリーブ１０は感光ドラム１に接触し、電源装置１１
によって所定の現像バイアスが印加されており、矢印Ｄ
方向に回転している。本実施の形態に係る現像スリーブ
１０は基層にウレタンゴム、表層にシリコン粒子を含有
したウレタンゴムによって構成された弾性ゴムローラで
構成されている。又、層厚規制部材としての現像ブレー
ド１３は、現像スリーブ１０上のトナー層を最適な層厚
に規制および帯電付与し、更に現像ブレード１３には電
源装置１２によって所定のブレードバイアスが印加され
ている。本実施の形態に係る現像ブレード１３はＳＵＳ
製のストレートブレードとした。In this embodiment, the non-magnetic one-component contact developing method is used as the developing method. The developing sleeve 10 as a developer carrying member contacts the photosensitive drum 1, and the power supply device 11
A predetermined developing bias is applied by the arrow D
Is rotating in the direction. The developing sleeve 10 according to the present embodiment is composed of an elastic rubber roller having a base layer of urethane rubber and a surface layer of urethane rubber containing silicon particles. The developing blade 13 as a layer thickness regulating member regulates and charges the toner layer on the developing sleeve 10 to an optimum layer thickness, and further, a predetermined blade bias is applied to the developing blade 13 by the power supply device 12. There is. The developing blade 13 according to the present embodiment is SUS
Made straight blade.
【００１７】又、トナー供給ローラ１４は現像スリーブ
１０上にトナーを供給し矢印Ｅの方向に回転している。
又、トナー容器１５はトナーを収容し、トナー供給ロー
ラ１４にトナーを供給するものである。The toner supply roller 14 supplies toner onto the developing sleeve 10 and rotates in the direction of arrow E.
Further, the toner container 15 stores the toner and supplies the toner to the toner supply roller 14.
【００１８】次に、本実施の形態で用いたトナーについ
て説明する。Next, the toner used in this embodiment will be described.
【００１９】本実施の形態で用いたトナーは非磁性一成
分トナーであり、トナー母粒子は負帯電性を有し、重量
平均径７．１μｍである。母粒子１００部、一次粒子の
平均径が１０ｎｍの疎水性シリカ微粒子１部、一次粒子
の平均径が０．４μｍの表面処理した酸化マグネシウム
化合物微粒子０．５部をヘンシェルミキサーにて外添し
てトナーを得た。The toner used in this embodiment is a non-magnetic one-component toner, and the toner mother particles have a negative charging property and have a weight average diameter of 7.1 μm. 100 parts of mother particles, 1 part of hydrophobic silica fine particles having an average primary particle diameter of 10 nm, and 0.5 part of surface-treated magnesium oxide compound fine particles having an average primary particle diameter of 0.4 μm were externally added using a Henschel mixer. Toner was obtained.
【００２０】又、疎水性シリカ微粒子と、表面処理した
酸化マグネシウム化合物微粒子のトナー母粒子に対する
摩擦帯電列の序列を調べた。Further, the order of the triboelectric charging sequence of the hydrophobic silica fine particles and the surface-treated magnesium oxide compound fine particles with respect to the toner mother particles was examined.
【００２１】図３に摩擦帯電量測定装置の概略図を示
す。装置は水平に対して６０°に傾斜させた支持台２０
１と、測定用の接触粉２０２を収納する接触粉収納部材
２０３と、支持台２０１に支持された測定物支持板２０
４上に供給された接触粉２０２を回収する回収容器２０
５と、測定物支持板２０４と接続されたエレクトロメー
ター２０６（KEITHLEY杜製モデル６５１４）とから構成
され、測定物支持板２０４上に塗布された被測定物２０
７に接触粉収納部材２０３から接触粉２０２を流し込
み、摩擦により発生する電荷量をエレクトロメーター２
０６に表示するものである。本発明におけるトナー母粒
子に対する疎水性シリカ微粒子と表面処理した酸化マグ
ネシウム化合物微粒子の帯電列特性の評価は、測定物支
持板２０４として厚さ１ｍｍのステンレス板にトナー母
粒子を溶剤中に溶解して浸漬塗布、乾燥させて試料を形
成し、接触粉２０２として疎水性シリカ微粒子、若しく
は表面処理した酸化マグネシウム化合物微粒子を用い、
トナー母粒子に対する疎水性シリカ微粒子と表面処理し
た酸化マグネシウム化合物微粒子の摩擦帯電列の測定を
行った。その結果、トナー母粒子に対して疎水性シリカ
微粒子はネガ極性を、表面処理した酸化マグネシウム化
合物微粒子はポジ極性を持っていることが分かった。FIG. 3 shows a schematic view of a triboelectric charge measuring device. The device is a support table 20 tilted at 60 ° to the horizontal.
1, a contact powder accommodating member 203 for accommodating the contact powder 202 for measurement, and an object support plate 20 supported by the support 201.
Collecting container 20 for collecting the contact powder 202 supplied onto
5 and an electrometer 206 (KEITHLEY Mori model 6514) connected to the measured object support plate 204, and the measured object 20 applied on the measured object support plate 204.
7, the contact powder 202 is poured from the contact powder storage member 203, and the amount of charge generated by friction is measured by the electrometer 2
It is displayed on 06. In the present invention, the charge matrix characteristics of the hydrophobic silica fine particles and the surface-treated magnesium oxide compound fine particles with respect to the toner mother particles are evaluated by dissolving the toner mother particles in a solvent on a stainless steel plate having a thickness of 1 mm as the object support plate 204. A sample is formed by dip coating and drying, and hydrophobic silica fine particles or surface-treated magnesium oxide compound fine particles are used as the contact powder 202.
The triboelectric charging series of the hydrophobic silica fine particles and the surface-treated magnesium oxide compound fine particles with respect to the toner mother particles was measured. As a result, it was found that the hydrophobic silica fine particles had a negative polarity and the surface-treated magnesium oxide compound fine particles had a positive polarity with respect to the toner mother particles.
【００２２】次に、現像ブレード１３に印加するブレー
ドバイアスについて説明する。Next, the blade bias applied to the developing blade 13 will be described.
【００２３】尚、ここで言うブレードバイアスとは、現
像ブレード電位−現像スリーブ電位のことである。The blade bias referred to herein is the developing blade potential-developing sleeve potential.
【００２４】最初に、トナーの固着が発生する現象はト
ナー８の帯電量が比較的大きい状況で発生していること
が挙げられる。これは、トナー８が鏡映力により現像ブ
レード１３へ強く引き付けられていることを意味してい
る。又、このとき、トナー８と現像ブレード１３との摩
擦やトナー８と現像スリーブ１０の摩擦によって生じた
電荷は図４に示すような回路において電流として流れて
いる。First, the phenomenon of toner sticking occurs when the amount of charge on the toner 8 is relatively large. This means that the toner 8 is strongly attracted to the developing blade 13 by the mirroring force. At this time, the electric charge generated by the friction between the toner 8 and the developing blade 13 and the friction between the toner 8 and the developing sleeve 10 flows as a current in the circuit as shown in FIG.
【００２５】ここで、図４に示すような構成でブレード
バイアスを変化させながら回路に流れる電流値を電流測
定装置３０で測定し、電流の向きをＩとすると、図５に
示すような電流値のプロフィールが得られる。Here, in the configuration as shown in FIG. 4, the value of the current flowing in the circuit is measured by the current measuring device 30 while changing the blade bias, and the direction of the current is I, then the current value as shown in FIG. Profile is obtained.
【００２６】図５において、ブレードバイアスＡでは摩
擦帯電によって生じる電荷が少ないために電流値も小さ
くなっていると考えられ、トナー８の帯電量がブレード
バイアスＡにおいて極小であると考えられる。ここで、
実際にブレードバイアスを変化させたときのトナーの帯
電量測定した。その結果、図６に示すプロフィールが得
られ、これは前述の考察を裏付けるものとなった。この
ようにしてブレードバイアスで帯電量を小さくしたトナ
ー８の鏡映力は小さくなり、現像ブレード１３上のトナ
ー８の固着は抑制される筈であった。In FIG. 5, in the blade bias A, it is considered that the electric current value is small because the electric charge generated by the triboelectric charging is small, and it is considered that the charge amount of the toner 8 is minimum in the blade bias A. here,
The toner charge amount was measured when the blade bias was actually changed. As a result, the profile shown in FIG. 6 was obtained, which supports the above consideration. In this way, the mirroring power of the toner 8 whose charge amount has been reduced by the blade bias should be reduced, and the fixation of the toner 8 on the developing blade 13 should be suppressed.
【００２７】実際にブレードバイアスＡを現像ブレード
１３に印加して現像動作を多数回繰り返したが、その効
果は期待した程ではなかった。原因は現像装置４が晒さ
れている環境やトナー８の劣化の具合によってブレード
バイアスＡは刻々と変化すると考えられ、ブレードバイ
アスＡを逐次、認識しておく必要があることが分かっ
た。The blade bias A was actually applied to the developing blade 13 and the developing operation was repeated many times, but the effect was not as expected. It is considered that the cause is that the blade bias A changes every moment depending on the environment to which the developing device 4 is exposed and how the toner 8 deteriorates, and it has been found that the blade bias A needs to be recognized successively.
【００２８】そこで、図４に示すような現像装置、若し
くは画像形成装置に作られた回路によって、現像動作開
始前に現像スリーブ１０を６秒間回転させながら、予め
決められたブレードバイアスを５点（０、−５０、−１
００、−１５０、−２００Ｖ）とって、各点において１
秒間ずつ回路に流れる電流値を測定し、その中で最小の
電流値を示すブレードバイアスを現像動作中のブレード
バイアスとした。Therefore, by using a developing device as shown in FIG. 4 or a circuit formed in the image forming device, the developing sleeve 10 is rotated for 6 seconds before starting the developing operation, and a predetermined blade bias is set to 5 points ( 0, -50, -1
00, -150, -200V), 1 at each point
The current value flowing in the circuit was measured every second, and the blade bias showing the minimum current value was used as the blade bias during the developing operation.
【００２９】以上のように現像動作開始前に現像スリー
ブ１０を回転させてから、現像動作中にブレードバイア
スを印加するまでを制御するようにマイクロコンピュー
ター３１にプログラミングした。As described above, the microcomputer 31 is programmed to control the period from the rotation of the developing sleeve 10 before the start of the developing operation to the application of the blade bias during the developing operation.
【００３０】マイクロコンピューター３１の制御下で上
記現像方法を多数回繰り返したところ、現像ブレード１
３上のトナー８の固着は抑制され、現像スリーブ１０上
のトナーコーティング層の安定化が可能になった。When the above developing method was repeated many times under the control of the microcomputer 31, the developing blade 1
Adhesion of the toner 8 on the developing sleeve 3 was suppressed, and the toner coating layer on the developing sleeve 10 could be stabilized.
【００３１】＜実施の形態２＞次に、本発明の実施の形
態２について説明する。<Second Embodiment> Next, a second embodiment of the present invention will be described.
【００３２】画像形成装置と現像装置の構成は実施の形
態１と変わらないが、マイクロコンピューター３１によ
って制御する内容を変えて実験を行った。制御の内容
は、現像動作を多数回繰り返した後、定期的に以下の内
容を行う、ブレードバイアスに５点（０、−５０、−１
００、−１５Ｏ、−２００Ｖ）を印加しながら、電流値
測定動作と測定値の解析・計算を現像スリーブを回転さ
せながら行い、このとき得られた適正なブレードバイア
スをマイクロコンピューター３１に記憶させる。記憶さ
れた値は次回の、多数回現像動作後の電流値測定動作ま
で記憶させておく。Although the configurations of the image forming apparatus and the developing apparatus are the same as those in the first embodiment, the experiment was conducted by changing the contents controlled by the microcomputer 31. The contents of control are 5 points (0, -50, -1) for the blade bias, which is obtained by repeating the developing operation many times and then periodically performing the following contents.
00, -15O, -200V), the current value measuring operation and the analysis / calculation of the measured value are performed while rotating the developing sleeve, and the proper blade bias obtained at this time is stored in the microcomputer 31. The stored value is stored until the next operation of measuring the current value after the multi-developing operation.
【００３３】更に、現像動作開始前にブレードバイアス
を今度は適正値−１０Ｖ、 適正値、適正値＋１０Ｖの３
点において１秒間ずつ印加し、今度は最適値を決定す
る。そして、この最適値を現像動作中のブレードバイア
スとした。最適なブレードバイアスで現像動作を行った
ため、実施の形態１よりも現像ブレード１３上のトナー
８の固着は抑制され、現像スリーブ１０上のトナーコー
ティング層の安定化が可能になった。Further, before starting the developing operation, the blade bias is set to 3 of proper value -10V, proper value and proper value + 10V.
Apply for 1 second each at the point and this time determine the optimum value. Then, this optimum value was used as the blade bias during the developing operation. Since the developing operation was performed with the optimum blade bias, the fixing of the toner 8 on the developing blade 13 was suppressed more than in the first embodiment, and the toner coating layer on the developing sleeve 10 could be stabilized.
【００３４】又、非現像動作中の現像装置４の動作時間
が短くなったため、現像装置４の各部品の磨耗、劣化を
少なくしていると考えている。Further, since the operating time of the developing device 4 during the non-developing operation is shortened, it is considered that the wear and deterioration of each part of the developing device 4 are reduced.
【００３５】[0035]
【発明の効果】以上の説明で明らかなように、本発明に
よれば、現像剤と、該現像剤を担持して搬送する回転可
能な現像剤担持体と、該現像剤担持体に当接して現像剤
を規制する導電性現像剤規制部材と、現像剤担持体と前
記導電性現像剤規制部材との間に直流電界を発生させる
電圧印加手段と、該電圧印加手段と現像剤担持体の回転
を制御する制御装置と、前記現像剤規制部材に流れる電
流値を測定する電流値測定装置と、該電流値測定装置に
よる測定値を解析して適切な電気信号を前記制御装置に
送る計算機と、を有する現像装置において、前記電圧印
加手段が漸次可変するように電圧を前記導電性現像剤規
制部材に印加して該導電性現像剤規制部材に流れる電流
を前記電流値測定装置によって測定し、測定値から特定
の電圧を前記計算機で選択し、この選択された電圧を導
電性現像剤規制部材に印加するように前記制御装置によ
って電圧印加手段を作動させるようにしたため、現像剤
担持体上にトナー薄層形成を安定して良好に行うことが
できるという効果が得られる。As is apparent from the above description, according to the present invention, the developer, the rotatable developer carrying member carrying and carrying the developer, and the abutting member on the developer carrying member. Of a conductive developer regulating member for regulating the developer by means of a voltage applying means for generating a DC electric field between the developer carrying member and the conductive developer regulating member, and the voltage applying means and the developer carrying member. A control device for controlling rotation, a current value measuring device for measuring a current value flowing in the developer regulating member, and a computer for analyzing a measurement value by the current value measuring device and sending an appropriate electric signal to the control device. In the developing device having, a voltage is applied to the conductive developer restricting member so that the voltage applying unit is gradually changed, and a current flowing through the conductive developer restricting member is measured by the current value measuring device, Calculate the specific voltage from the measured value The voltage applying means is operated by the control device so that the selected voltage is applied to the conductive developer regulating member, so that the toner thin layer can be stably formed on the developer carrying member in good condition. The effect that it can be done is obtained.
【図１】本発明に係る現像装置の断面図である。FIG. 1 is a sectional view of a developing device according to the present invention.
【図２】本発明に係る現像装置を備える画像形成装置要
部の断面図である。FIG. 2 is a sectional view of an essential part of an image forming apparatus including a developing device according to the present invention.
【図３】摩擦帯電量測定装置の概略図である。FIG. 3 is a schematic view of a triboelectric charge amount measuring device.
【図４】本発明に係る現像装置とその電気回路構成を示
す断面図である。FIG. 4 is a sectional view showing a developing device according to the present invention and an electric circuit configuration thereof.
【図５】ブレードバイアスと図４の電気回路に流れる電
流との関係を示す図である。5 is a diagram showing a relationship between a blade bias and a current flowing through the electric circuit of FIG.
【図６】ブレードバイアスと現像スリーブ上にコートし
たトナーの帯電量との関係を示す図である。FIG. 6 is a diagram showing a relationship between a blade bias and a charge amount of toner coated on a developing sleeve.
１ 感光ドラム ２ 耐電ローラ ３ 露光装置 ４ 現像装置 ５ 転写ローラ ６ クリーニング装置 １０ 現像ローラ １１，１２ 電源装置 １３ 現像ブレード １４ トナー供給ローラ １５ トナー容器 １６ スイッチ ２０ 撹拌部材 ３０ 電流測定装置 ３１ マイクロコンピューター 1 photosensitive drum 2 Anti-electric roller 3 exposure equipment 4 Developing device 5 Transfer roller 6 cleaning device 10 developing roller 11,12 power supply 13 Development blade 14 Toner supply roller 15 Toner container 16 switch 20 Stirrer 30 Current measuring device 31 Microcomputer
フロントページの続き Ｆターム(参考） 2H005 AA08 CB07 CB13 DA02 DA03 EA05 FA07 2H077 AC04 AD02 AD06 AD13 AD17 AD23 AD35 AE03 DA24 DA43 DA57 DA82 DA83 DB25 EA14 EA15 FA13 FA22 FA26 GA03Continued front page F term (reference) 2H005 AA08 CB07 CB13 DA02 DA03 EA05 FA07 2H077 AC04 AD02 AD06 AD13 AD17 AD23 AD35 AE03 DA24 DA43 DA57 DA82 DA83 DB25 EA14 EA15 FA13 FA22 FA26 GA03
Claims (12)
回転可能な現像剤担持体と、該現像剤担持体に当接して
現像剤を規制する導電性現像剤規制部材と、現像剤担持
体と前記導電性現像剤規制部材との間に直流電界を発生
させる電圧印加手段と、該電圧印加手段と現像剤担持体
の回転を制御する制御装置と、前記現像剤規制部材に流
れる電流値を測定する電流値測定装置と、該電流値測定
装置による測定値を解析して適切な電気信号を前記制御
装置に送る計算機と、を有する現像装置において、 前記電圧印加手段が漸次可変するように電圧を前記導電
性現像剤規制部材に印加して該導電性現像剤規制部材に
流れる電流を前記電流値測定装置によって測定し、測定
値から特定の電圧を前記計算機で選択し、この選択され
た電圧を導電性現像剤規制部材に印加するように前記制
御装置によって電圧印加手段を作動させることを特徴と
する現像装置。1. A developer, a rotatable developer carrier that carries and conveys the developer, a conductive developer restricting member that contacts the developer carrier to restrict the developer, and a developing device. A voltage applying means for generating a DC electric field between the developer carrying member and the conductive developer regulating member, a control device for controlling the rotation of the voltage applying means and the developer carrying member, and a current flowing through the developer regulating member. In a developing device having a current value measuring device for measuring a current value and a computer for analyzing a measured value by the current value measuring device and sending an appropriate electric signal to the control device, the voltage applying means is gradually variable. As described above, a voltage is applied to the conductive developer regulating member, the current flowing through the conductive developer regulating member is measured by the current value measuring device, and a specific voltage is selected from the measured value by the computer, and this selection is made. Applied voltage to conductive developer Developing apparatus characterized by operating the voltage applying means by said control device so as to apply to the control member.
が、前記制御装置によって多種類の特定の電圧を前記導
電性現像剤規制部材に印加するように前記電圧印加手段
を作動させて導電性現像剤規制部材に流れる電流を前記
電流値測定装置によって測定し、電流が最小となるよう
な特定の電圧を前記計算機で選択して、この選択された
電圧を導電性現像剤規制部材に印加するように制御装置
によって電圧印加手段を作動させることを特徴とする請
求項１記載の現像装置。2. A method of measuring an electric current value and determining an appropriate voltage is a method of operating the voltage applying means so that the control device applies various kinds of specific voltages to the conductive developer regulating member. Current flowing through the conductive developer regulating member is measured by the current value measuring device, a specific voltage that minimizes the current is selected by the computer, and the selected voltage is applied to the conductive developer regulating member. 2. The developing device as claimed in claim 1, wherein the voltage applying means is operated by the control device.
が、前記制御装置によって特定の領域の電圧を連続に変
化させるように前記電圧印加手段を作動させて導電性現
像剤規制部材に流れる電流を前記電流値測定装置によっ
て測定し、測定された電流の差分が０に近づくような電
圧を前記計算機で計算・選択し、この選択された電圧を
導電性現像剤規制部材に印加するように制御装置によっ
て電圧印加手段を作動させることを特徴とする請求項１
記載の現像装置。3. A method of measuring a current value and determining an appropriate voltage, wherein the control device operates the voltage applying means to continuously change the voltage in a specific region to flow to the conductive developer regulating member. An electric current is measured by the electric current value measuring device, and a voltage is calculated and selected by the computer so that the difference between the measured electric currents approaches 0, and the selected voltage is applied to the conductive developer regulating member. 2. The voltage applying means is operated by the control device.
The developing device described.
部材に漸次可変した電圧を印加しながら、電流値測定動
作と測定値の解析・計算を、前記現像剤担持体を回転さ
せながら行うことを特徴とする請求項２又は３記載の現
像装置。4. The current value measuring operation and the analysis / calculation of the measured value are performed while rotating the developer carrier while applying a gradually variable voltage to the conductive developer regulating member before starting the developing operation. The developing device according to claim 2, wherein the developing device is a developing device.
部材に漸次可変した電圧を印加しながら、電流値測定動
作と測定値の解析・計算を前記現像剤担持体を回転させ
ながら行うことを特徴とする請求項２又は３記載の現像
装置。5. The current value measuring operation and the analysis / calculation of the measured value are performed while rotating the developer carrier while applying a gradually variable voltage to the conductive developer regulating member after the developing operation is completed. The developing device according to claim 2, wherein the developing device is a developing device.
に前記導電性現像剤規制部材に漸次可変した電圧を印加
しながら、電流値測定動作と測定値の解析・計算を前記
現像剤担持体を回転させながら行うことを特徴とする請
求項２又は３記載の現像装置。6. After the developing operation is repeated a number of times, the current value measuring operation and the analysis / calculation of the measured value are carried out while periodically applying a gradually varying voltage to the conductive developer regulating member. 4. The developing device according to claim 2, wherein the development is performed while rotating the body.
に前記導電性現像剤規制部材に漸次可変した電圧を印加
しながら、電流値測定動作と測定値の解析・計算を前記
現像剤担持体を回転させながら行い、現像動作開始前に
前記導電性現像剤規制部材に、定期的に測定して決定し
た印加電圧を中心に定期的に測定する電圧領域よりも小
さい領域で漸次可変した電圧を印加しながら、電流値測
定動作と測定値の解析・計算を現像剤担持体を回転させ
ながら行うことを特徴とする請求項２又は３記載の現像
装置。7. After carrying out a developing operation a number of times, while applying a gradually variable voltage to the conductive developer regulating member, the current value measuring operation and the analysis / calculation of the measured value are carried on the developer. The voltage is gradually changed in a region smaller than the voltage region that is measured while the body is rotated and the conductive developer regulating member is periodically measured before the start of the developing operation. 4. The developing device according to claim 2, wherein the current value measuring operation and the analysis / calculation of the measured value are performed while the developer carrier is rotated while applying the voltage.
に前記導電性現像剤規制部材に漸次可変した電圧を印加
しながら、電流値測定動作と測定値の解析・計算を前記
現像剤担持体を回転させながら行い、現像動作終了後に
導電性現像剤規制部材に、定期的に測定して決定した印
加電圧を中心に定期的に測定する電圧領域よりも小さい
領域で漸次可変した電圧を印加しながら、電流値測定動
作と測定値の解析・計算を現像剤担持体を回転させなが
ら行うことを特徴とする請求項２又は３記載の現像装
置。8. The developer carrying operation is carried out by repeating a developing operation a number of times and then applying a gradually variable voltage to the conductive developer regulating member on a regular basis while performing a current value measuring operation and analysis / calculation of the measured value. This is done while rotating the body, and after the development operation is completed, the voltage that is gradually changed is applied to the conductive developer regulating member in a region smaller than the voltage region that is regularly measured centered on the applied voltage that is determined by periodic measurement. The developing device according to claim 2 or 3, wherein the current value measuring operation and the analysis / calculation of the measured value are performed while rotating the developer carrier.
た電圧を前記電圧印加手段によって前記導電性現像剤規
制部材に電圧を印加することを特徴とする請求項４〜８
の何れかに記載の現像装置。9. The voltage selected by the computer is applied to the conductive developer regulating member by the voltage applying means during the developing operation.
The developing device according to any one of 1.
選択した電圧を前記電圧印加手段によって前記導電性現
像剤規制部材に電圧印加し、電流値測定時間と重なる場
合は測定終了後に計算機によって選択した電圧を電圧印
加手段によって導電性現像剤規制部材に電圧印加するこ
とを特徴とする請求項４〜８に記載の現像装置。10. The voltage selected by the computer before the start of the developing operation is applied to the conductive developer regulating member by the voltage application means, and when the current value measurement time overlaps, the voltage selected by the computer after the measurement is completed. 9. The developing device according to claim 4, wherein the voltage is applied to the conductive developer regulating member by a voltage applying unit.
選択した電圧を前記電圧印加手段によって前記導電性現
像剤規制部材に電圧印加し、電流値測定時間と重なる場
合は測定終了後に計算機によって選択した電圧を前記電
圧印加手段によって導電性現像剤規制部材に電圧印加す
ることを特徴とする請求項４〜８の何れかに記載の現像
装置。11. The voltage selected by the computer after completion of the developing operation is applied to the conductive developer regulating member by the voltage application means, and when the current value measurement time overlaps, the voltage selected by the computer after the measurement is completed. 9. The developing device according to claim 4, wherein a voltage is applied to the conductive developer regulating member by the voltage applying unit.
じ微粒子と現像剤母粒子と帯電極性の異なる微粒子が少
なくとも１種ずつ外添されていることを特徴とする請求
項１〜１１の何れかに記載の現像装置。12. The developer according to claim 1, wherein at least one kind of fine particles having the same charge polarity as that of the developer mother particles and at least one kind of fine particles having a different charge polarity from the developer mother particles are externally added. The developing device according to any one of claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001254889A JP2003066716A (en) | 2001-08-24 | 2001-08-24 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001254889A JP2003066716A (en) | 2001-08-24 | 2001-08-24 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003066716A true JP2003066716A (en) | 2003-03-05 |
Family
ID=19082974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001254889A Withdrawn JP2003066716A (en) | 2001-08-24 | 2001-08-24 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003066716A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010060999A (en) * | 2008-09-05 | 2010-03-18 | Canon Inc | Image forming apparatus |
| US7903989B2 (en) * | 2008-04-07 | 2011-03-08 | Canon Kabushiki Kaisha | Developing apparatus with deformation detection and voltage correction |
| JP2013214105A (en) * | 2013-07-16 | 2013-10-17 | Canon Inc | Image forming apparatus |
| US8768190B2 (en) | 2009-06-11 | 2014-07-01 | Canon Kabushiki Kaisha | Developing device |
| JP2015107472A (en) * | 2013-12-05 | 2015-06-11 | 株式会社リコー | Liquid droplet discharge device and particle production device |
-
2001
- 2001-08-24 JP JP2001254889A patent/JP2003066716A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7903989B2 (en) * | 2008-04-07 | 2011-03-08 | Canon Kabushiki Kaisha | Developing apparatus with deformation detection and voltage correction |
| JP2010060999A (en) * | 2008-09-05 | 2010-03-18 | Canon Inc | Image forming apparatus |
| CN103257551A (en) * | 2008-09-05 | 2013-08-21 | 佳能株式会社 | Image forming apparatus and image forming system |
| CN103257551B (en) * | 2008-09-05 | 2015-09-09 | 佳能株式会社 | Image processing system and image formation system |
| US8768190B2 (en) | 2009-06-11 | 2014-07-01 | Canon Kabushiki Kaisha | Developing device |
| JP2013214105A (en) * | 2013-07-16 | 2013-10-17 | Canon Inc | Image forming apparatus |
| JP2015107472A (en) * | 2013-12-05 | 2015-06-11 | 株式会社リコー | Liquid droplet discharge device and particle production device |
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