JP2903770B2 - Developing method - Google Patents

Developing method

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JP2903770B2
JP2903770B2 JP12447091A JP12447091A JP2903770B2 JP 2903770 B2 JP2903770 B2 JP 2903770B2 JP 12447091 A JP12447091 A JP 12447091A JP 12447091 A JP12447091 A JP 12447091A JP 2903770 B2 JP2903770 B2 JP 2903770B2
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electrostatic latent
latent image
developer
holding member
member
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JPH04328783A (en )
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孝幸 山下
善郎 山口
保浩 楠本
明彦 野田
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富士ゼロックス株式会社
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【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は、電子写真複写機等の画像形成装置において用いられ、感光体上の静電潜像を粉状現像剤によって現像する方法に係り、特に絶縁性トナーと磁性粒子とを混合した二成分現像剤を用いる現像方法に関する。 BACKGROUND OF THE INVENTION This invention is used in an image forming apparatus such as an electrophotographic copying machine, an electrostatic latent image on the photosensitive member relates to a method of developing by powdery developer, especially insulating toner and a magnetic a developing method using a two-component developer obtained by mixing the particles.

【0002】 [0002]

【従来の技術】従来より二成分現像剤を用いた現像方法として現像剤担持体を使用し、これと近接する感光体上の静電潜像にトナーを転写する方法が知られている。 Using the developer carrying member as the developing method using a Conventional than two-component developer, a method of transferring the toner to the electrostatic latent image on the photosensitive member to close is known as this. この方法に使用される現像装置の概略は例えば次のようなものである。 Summary of the developing device used in this method is as follows, for example. 静電潜像保持体と近接して配置され表面に現像剤を吸着して搬送することができる現像剤担持体と、この現像剤担持体上に吸着された現像剤の量を規制し、現像剤の薄層を形成する現像剤規制部材とがハウジング内に設けられており、ハウジング内の現像剤収容室から現像剤担持体に現像剤が供給されるようになっている。 Electrostatic and latent image bearing member a developer carrying a developer to disposed surfaces in proximity can be transported by suction and body, to regulate the amount of adsorbed developer to the developer carrying member, a developing thin layer and the developer regulating member for forming a is provided in the housing of the agent, the developer is to be supplied to the developer carrying member from the developer accommodating chamber in the housing.

【0003】上記現像剤担持体は非磁性材料からなり回転可能に支持された円筒状のスリーブと、その内部において位置が不動に取り付けられた複数の磁石とを有しており、その磁石の磁界によって現像剤がスリーブの表面に吸着され、現像剤中の磁性粒子(キャリア)による磁気ブラシが形成されるようになっている。 [0003] The developer carrying member has a cylindrical sleeve which is rotatably supported of a non-magnetic material, and a plurality of magnets positioned is mounted immovably in its interior, magnetic field of the magnet so that the developer is adsorbed on the surface of the sleeve, the magnetic brush is formed by magnetic particles in the developer (carrier) by. また、現像剤担持体には静電潜像保持体との間に電界を生じさせるバイアス電圧が印加されている。 The bias voltage generates an electric field is applied between the developer carrying member and the electrostatic latent image holding member. この現像剤担持体は静電潜像保持体と近接して対向する位置に設けられ、この対向する位置が現像領域となり、ここでの双方の間隔は上記磁気ブラシが静電潜像保持体と接触し得る程度に設定されている。 The developer carrying member is provided at a position opposite to and close to the electrostatic latent image holding member, the opposite position is a developing region, wherein both the spacing of the and the magnetic brush electrostatic latent image holding member It is set to a degree that may contact.

【0004】このような現像装置において静電潜像の現像は次のような方法によって行われる。 [0004] development of an electrostatic latent image in such developing devices is performed by the following method. 図6に示すように磁気ブラシが静電潜像保持体と接触した状態で静電潜像保持体が回転を開始し、その表面が一様に帯電された後、露光によって帯電電位の差による静電潜像が形成される。 FIG magnetic brush as shown in 6 is an electrostatic latent image holding member in contact with the electrostatic latent image bearing member starts rotating, after the surface has been uniformly charged, due to the difference of the charging potential by exposure an electrostatic latent image is formed. その後、バイアス電圧の印加が開始されるとともに現像剤担持体が回転動作を開始し、現像剤担持体表面に形成されている磁気ブラシが連続的に現像領域へ搬送される。 Then, the developer carrying member with the application of the bias voltage is started to start the rotation, the magnetic brush formed on the surface of the developer carrying member is conveyed continuously to the developing region. 現像領域ではバイアス電圧が印加されており、 Bias voltage in the developing region is applied,
帯電したトナーは静電潜像保持体の表面に接触する磁気ブラシから静電潜像に付着し、現像が行なわれる。 Charged toner adheres from the magnetic brush in contact with the surface of the electrostatic latent image holding member to the electrostatic latent image, development is performed. 静電潜像保持体上の静電潜像が現像領域を通過した後は、現像剤担持体の回転が停止されるとともにバイアス電圧の印加が解除され、一連の現像工程を終了する。 After the electrostatic latent image on the electrostatic latent image holding member has passed through the developing area, the application of the bias voltage with the rotation of the developer carrying member is stopped is released, and ends the series of development processes.

【0005】 [0005]

【発明が解決しようとする課題】しかしながら、上記のような従来の現像方法では、現像剤担持体の始動および停止、バイアス電圧の印加および解除と関連して表1に示すような問題点がある。 [SUMMARY OF THE INVENTION However, in the conventional developing method as described above, starting and stopping of the developer carrying member, there is a problem as shown in Table 1 in connection with the application and release of the bias voltage .

【0006】 [0006]

【表1】 [Table 1]

【0007】現像を開始しようとするとき、磁気ブラシが静電潜像保持体と接触しており、静電潜像保持体が動作している状態で現像剤担持体の動作を開始する(表1 [0007] When attempting to start a development, magnetic brush is in contact with the electrostatic latent image holding member, to start the operation of the developer carrying member in a state in which the electrostatic latent image holding member is operating (Table 1
中、欄)と、接触している磁気ブラシが急に動きだすことになり、多量の現像剤が静電潜像保持体に付着する。 In a column), a magnetic brush in contact becomes suddenly start moving it, a large amount of the developer adheres to the electrostatic latent image holding member. 多量に付着した現像剤は現像領域において、現像剤担持体と静電潜像保持体との間隙に詰まり、静電潜像保持体の回転速度にムラを生じることになる。 Developer large amount of deposition in the developing area, clogging the gap between the developer carrying member and the electrostatic latent image holding member, thereby causing uneven rotation speed of the electrostatic latent image holding member. 静電潜像保持体の回転速度のムラは像の歪みを生じさせ、特に複数の色を重ね合わせるカラー画像を形成しようとする場合には、静電潜像保持体の回転速度の変動がわずかであっても色ずれが生じ、良好な画像が得られない。 Unevenness of the rotation speed of the electrostatic latent image holding member produces a distortion of the image, in order to form a color image in particular overlapping a plurality of colors, variations in the rotational speed of the electrostatic latent image holding member is slightly color misregistration even occurs, no satisfactory image is obtained.

【0008】また、静電潜像保持体表面に付着する現像剤にはトナーのみではなく磁性粒子であるキャリアも含まれており、キャリアが多量に付着するとブレードによるクリーニング装置を用いた場合には、ブレードや静電潜像保持体表面が傷つき、黒すじや黒斑などの画像欠陥が生じる。 Further, the developer adhering to the surface of the electrostatic latent image holder also includes carrier are magnetic particles not only toner, if the carrier is using the cleaning device by the blade when a large amount adhering , it damages the blades and the surface of the electrostatic latent image holder, resulting image defects such as black streaks or black spots. また用紙への転写装置として静電潜像保持体と近接して回転する転写ロールを用いる場合には、静電潜像保持体に付着したキャリアが転写ロールと静電潜像保持体との近接部分を通過する際に、静電潜像保持体の回転に対する負荷を増大させ、静電潜像保持体の回転速度が変動して画像に欠陥が生じることになる。 In the case of using the transfer roll rotating in close proximity to the electrostatic latent image holding member as a transfer device for sheet, near the carrier adhering to the electrostatic latent image holding member is a transfer roller and the electrostatic latent image holding member when passing through the portion, increasing the load on the rotation of the electrostatic latent image holding member, so that image defects occur rotational speed of the electrostatic latent image holding member is varied. このような問題点はバイアス電圧が印加されている状態、または印加されていない状態のいずれの場合にも生じる。 Such problem also occurs in the case of any state not state or applied bias voltage is applied.

【0009】また、現像剤担持体の動作を停止したとき(表1中、欄)にも、急に磁気ブラシの動きが止まることによって現像剤が静電潜像保持体に多量に付着するという問題が生じる。 [0009] (In Table 1, column) when stopping the operation of the developer carrying member in, that the developer adheres in large amounts to the electrostatic latent image holding member suddenly by the movement of the magnetic brush is stopped problems.

【0010】一方、静電潜像保持体が動作し、磁気ブラシが接触した状態でバイアス電圧の印加を開始したとき(表1中、欄)および印加を解除したとき(表1中、 On the other hand, operate the electrostatic latent image holding member, when starting the application of the bias voltage in a state where the magnetic brush is in contact (in Table 1, column) when releasing the and applied (in Table 1,
欄)にも急に電界の作用が開始または停止されることによって多量の現像剤が静電潜像保持体に付着する。 A large amount of the developer adheres to the electrostatic latent image holding member by suddenly effect of an electric field to field) is started or stopped. これによって上記現像剤担持体の始動時および停止時と同様の問題が生じる。 This same problem as when starting up and stopping of the developer carrying member is produced. さらにバイアス電圧の印加時には、 When more of the bias voltage application,
電圧が図7に示すように変動し、一時的に印加電圧が高くなる(オーバーシュート)。 Voltage varies as shown in FIG. 7, temporarily applied voltage is high (overshoot). これによって現像剤担持体と静電潜像保持体との間でバイアス電圧下の放電がおこり、静電潜像保持体表面を傷つけることがある。 This discharge occurs under a bias voltage between the developer carrying member and the electrostatic latent image holder, which may damage the surface of the electrostatic latent image holder.

【0011】表1中、欄に示すように現像剤担持体の始動とバイアス電圧の印加開始時に差があり、バイアス電圧が先に印加される場合には、現像領域内で静止している磁気ブラシのキャリアに電荷の注入がおこり、帯電したキャリアが静電潜像保持体に付着するという問題がある。 [0011] In Table 1, there is a difference in time of start of the application of startup and bias voltage of the developer carrying member as shown in the column, if the bias voltage is applied to the first, magnetic at rest in a developing region It occurs charge injection to the brush carrier, charged carriers there is a problem that adheres to the electrostatic latent image holding member. キャリアが静電潜像保持体に付着すると上記したように画像の欠陥を生じる原因となる。 When the carrier is adhered to the electrostatic latent image holding member becomes cause for a defect of the image as described above.

【0012】静電潜像保持体を停止した状態であっても、バイアス電圧の印加開始時(表1中、欄)においては静電潜像保持体と現像剤担持体との間でのバイアス下の放電によって静電潜像保持体を傷つけるという問題があり、さらに現像剤担持体が停止しておりバイアス電圧のみが作用する状態(表1中、欄)ではキャリアへの電荷の注入がおこる。 [0012] Even in a state of stopping the electrostatic latent image holding member, (in Table 1, column) applied at the start of the bias voltage bias between in the electrostatic latent image holding member and the developer carrying member There is a problem that damage the electrostatic latent image holding member by the discharge of the lower, further (in Table 1, column) developer state where only the bias voltage is carrying member stops acts occurs charge injection into the carrier . さらに静電潜像保持体が停止している状態で現像剤担持体を動作させる(表1中、 Using the electrostatic latent image holding member operates the developer carrying member in a state in which the stop (in Table 1,
欄)と、磁気ブラシが静電潜像保持体の一カ所のみと接触し、静電潜像保持体表面を傷つけるという問題もある。 A column), the magnetic brush is in contact with only one portion of the electrostatic latent image holding member, there is a problem that damage the surface of the electrostatic latent image holder.

【0013】カラー画像を形成する画像形成装置では、 [0013] In the image forming apparatus for forming a color image,
複数の現像装置が一つの静電潜像保持体に対向して設けられ、これらの現像装置が現像を行なわないときには静電潜像保持体と磁気ブラシとが接触しない位置に保持され、現像を行なう現像装置のみが移動して磁気ブラシと静電潜像保持体とが接触する位置に設定されるものがある。 A plurality of developing devices are provided to face the one of the electrostatic latent image holding member, these developing devices is held in a position not in contact with the electrostatic latent image holding member and the magnetic brush when not performed developing, the development only the developing apparatus for performing is what the magnetic brush and the electrostatic latent image holding member to move is set to a position in contact. このような現像装置を有する画像形成装置においても、現像に使用される現像装置が磁気ブラシと静電潜像保持体とが接触する位置に設定され、その後現像剤担持体の回転およびバイアス電圧の印加を開始して現像を行ない、現像終了後は現像剤担持体の回転、バイアス電圧の印加を停止した後に現像装置を静電潜像保持体から離隔するようになっているので、上記と全く同様の問題点を有している。 Also in the image forming apparatus having such a developing apparatus, a developing apparatus used in the developing is set to a position of contact between the magnetic brush and the electrostatic latent image holding member, the rotation and the bias voltage of the subsequent developer carrying member applying performs start to development, the rotation of the after the development the developer carrying member, so that so as to apart from the electrostatic latent image holding member of the developing device after stopping the application of the bias voltage, exactly the above It has the same problems.

【0014】本発明は上記のような状況に鑑みてなされたものであり、その目的は、静電潜像の現像を開始するまでの状態または静電潜像の現像終了後、現像状態を解除する状態において、静電潜像保持体に現像剤が多量に付着することや、バイアス電圧下の放電が生じることを防止し、良好な画像が得られる現像方法を提供することである。 [0014] The present invention has been made in view of the above circumstances, and its object is after completion of development of the condition or the electrostatic latent image to the start of development of the electrostatic latent image, releasing the developing state in the state of, and the developer to the electrostatic latent image holding member is a large amount of adhesion, prevents the discharge under the bias voltage is generated, is to provide a developing method good images are acquired.

【0015】 [0015]

【課題を解決するための手段】上記問題点を解決するために、本発明は、磁石ロールを内蔵し、表面に二成分現像剤の磁気ブラシを形成して現像剤を搬送する現像剤担持体と、露光によって表面に静電潜像が形成される静電潜像保持体とが近接して対向する位置で、前記磁気ブラシを前記静電潜像保持体表面に接触させるとともに、前記静電潜像保持体と現像剤担持体との間にバイアス電圧を印加し、帯電した現像剤を前記静電潜像に付着させて可視化する現像方法において、 図1に示すように、前記静電潜像を現像しないときは、前記現像剤担持体を、 In order to solve the above problems SUMMARY OF THE INVENTION The present invention has a built-in magnet roll, to form a magnetic brush of the two-component developer on the surface for conveying the developer the developer carrying member When, at a position where the electrostatic latent image holding member on which an electrostatic latent image is formed on the surface by exposure to face in close proximity, with contacting the magnetic brush to the electrostatic latent image holding member surface, the latent electrostatic a bias voltage is applied between the latent image bearing member and the developer carrying member, charged developer adhere to the electrostatic latent image in a developing process for visualizing, as shown in FIG. 1, the electrostatic latent when not develop the image, the said developer carrying member,
前記磁気ブラシが静電潜像保持体に接触しない位置に保持し、 前記静電潜像保持体上の静電潜像を現像するときに、バイアス電圧の印加、および現像剤担持体の動作を開始し、 その後現像剤担持体を、前記磁気ブラシが動作中の前記静電潜像保持体と接触する位置に移動させて現像を行ない、 現像終了後、再び前記現像剤担持体を、前記磁気ブラシが動作中の前記静電潜像保持体と接触しない位置に戻し、 その後バイアス電圧の印加解除、および現像剤担持体の動作の停止を行なうものとする。 When the magnetic brush is held at a position not in contact with the electrostatic latent image holding member, developing the electrostatic latent image on the electrostatic latent image holding member, the application of the bias voltage, and the operation of the developer carrying member started, then the developer carrying member performs development by moving to the position where the magnetic brush is in contact with the electrostatic latent image holding member in operation, after the completion of development, again the developer carrier, said magnetic brush back into a position not in contact with the electrostatic latent image holding member in operation, applied release subsequent bias voltage, and it is assumed to perform the stop of the operation of the developer carrying member.

【0016】上記バイアス電圧印加の開始時(T B1 [0016] At the start of the bias voltage applied (T B1)
と、現像剤担持体の動作の開始時(T R1 )はいずれが先であっても良いし、同時であってもよい。 When, at the start of operation of the developer carrying member (T R1) either has to be a first, it may be simultaneous. また、上記バイアス電圧印加の解除時(T B2 )と、現像剤担持体の動作の停止時(T R2 )はいずれが先であってもよいし、同時であってもよい。 Further, when release of the bias voltage application and (T B2), when stopping the operation of the developer carrying member (T R2) may be the one that previously may be simultaneous. また、静電潜像保持体の動作の開始時(T S1 )は磁気ブラシが静電潜像保持体と接触する時(T T1 )より先であればよく、静電潜像保持体の動作の停止時(T S2 )は、現像終了後に磁気ブラシが静電潜像保持体と離れる時(T T2 )の後とすればよい。 Also, at the start of operation of the electrostatic latent image holding member (T S1) may be any earlier than when (T T1) where the magnetic brush contacts the electrostatic latent image holding member, operation of the electrostatic latent image holding member when stopping (T S2), it is sufficient and after when the magnetic brush after development completion is separated with the electrostatic latent image holding member (T T2).

【0017】 [0017]

【作用】上記のような現像方法では、現像を行わないときに現像剤担持体はその表面に形成された磁気ブラシが静電潜像保持体と接触しない位置に保持されており、現像を開始する時にそのままの位置でバイアス電圧の印加、および現像剤担持体の始動が行われる。 [Action] In the development process as described above, are held developer carrying member at a position where the magnetic brush formed on the surface thereof does not contact with the electrostatic latent image holding member when not performing development, starts the development application of the bias voltage, and the starting of the developer carrying member is performed in situ when. したがって、静電潜像保持体に多量の現像剤が付着するようなことはなく、またバイアス電圧下の放電も生じない。 Therefore, no such thing as a large amount of the developer adheres to the electrostatic latent image holding member, also does not occur discharge under the bias voltage. バイアス電圧の印加開始、および現像剤担持体の始動後、磁気ブラシが静電潜像保持体表面と接触する位置に現像剤担持体を移動するので、磁気ブラシは現像剤担持体上で搬送されながら徐々に静電潜像保持体の表面と接触し、 Start of the application of the bias voltage, and after the start of the developer carrying member, so to move the developer carrying member at a position where the magnetic brush contacts the surface of the electrostatic latent image holder, the magnetic brush is carried on the developer carrying member while in contact with gradually electrostatic latent image holding member surface,
このときにも現像剤の多量の付着等は生じない。 It does not occur a large amount of adhesion of the developer in this case.

【0018】静電潜像が現像領域を通過し、現像が終了すると磁気ブラシが静電潜像保持体と接触しない位置まで現像剤担持体を移動させ、その後バイアス電圧の印加解除、および現像剤担持体の動作の停止を行なうので、 The electrostatic latent image passes through the developing region, the developing is completed magnetic brush moves the developer carrying member to a position that is not in contact with the electrostatic latent image holding member, applying release subsequent bias voltage, and a developer since a stop of the operation of the carrier,
バイアス電圧の印加開始時、および現像剤担持体の始動時と同様、静電潜像保持体に多量の現像剤が付着するような不都合がなくなる。 At start of the application of the bias voltage, and similarly to the start of the developer carrying member, there is no inconvenience such as large amount of developer to the electrostatic latent image holding member is attached. これによって画像に欠陥が生じるのが防止される。 This is prevented from defects in the image.

【0019】 [0019]

【実施例】以下本発明の実施例について図を用いて説明する。 For the embodiment of EXAMPLES Hereinafter the present invention will be described with reference to FIG. 図2は本発明の実施例である現像方法に用いられる現像装置の一例を示す概略構成図である。 Figure 2 is a schematic diagram showing an example of a developing device used for development method which is an embodiment of the present invention. 現像装置2 The developing device 2
は、帯電電位の差による静電潜像を保持することができる静電潜像保持体1と対向して設けられており、この現像装置2は現像剤を収容するハウジング7と、位置が固定された複数の磁石9を内部に有しこの周囲で回転自在に支持された非磁性円筒状の現像剤担持体3と、現像剤担持体3の表面に付着する磁性現像剤の量を規制する現像剤規制部材4と、回転して現像剤の攪拌及び搬送を行ない現像剤担持体3に現像剤を供給するスクリューオーガー5、6とを備えている。 Is provided to face the electrostatic latent image bearing member 1 which can hold an electrostatic latent image due to a difference in charge potential, the housing 7 The developing device 2 for accommodating the developer, a position fixed a nonmagnetic cylindrical developer carrying member 3 that is rotatably supported in the ambient has therein a plurality of magnets 9 that is, to regulate the amount of magnetic developer adhering to the surface of the developer carrying member 3 a developer regulating member 4, and a screw auger 5,6 supplying the developer to the developer carrying member 3 agitating and conveying of the rotating developer.

【0020】上記静電潜像保持体1は表面に高分子化合物からなる感光体(opc感光体)を有しており、一旦一様に帯電させた後露光して静電潜像を形成できるものである。 [0020] The electrostatic latent image bearing member 1 has a photoreceptor made of a polymer compound on the surface of the (opc photoconductor), can form an electrostatic latent image by exposing After once uniformly charged it is intended. 上記現像剤担持体3は内部に複数の磁石9を有し、これらはS極とN極とが交互に配置されたもので、 The developer carrying member 3 has a plurality of magnets 9 therein, these has been arranged alternately with S and N poles,
隣接する磁極間で形成される磁界によって磁性粒子の磁気ブラシを現像剤担持体3の表面に形成し、回転して現像剤を搬送できるようになっている。 A magnetic brush of the magnetic particles is formed on the surface of the developer carrying member 3 by a magnetic field formed between adjacent magnetic poles, and to be able to convey the developer by rotating. また、現像剤担持体3には直流電源10および交流電源11から直流重量交流電圧が印加されており、静電潜像保持体1と近接する位置(現像領域)に形成される電界によって電荷を有するトナーが静電潜像に付着するようになっている。 Further, the developer carrying member 3 and the DC weight AC voltage is applied from the DC power source 10 and the AC power supply 11, a charge by an electric field formed at the position (developing region) close to the electrostatic latent image bearing member 1 toner having is adapted to adhere to the electrostatic latent image. 現像剤規制部材4は、一端がハウジング7と固定して支持され、他端が現像剤担持体3の表面に近接して突き出すように取り付けられており、現像剤担持体表面に吸着される現像剤を一定量に規制するものである。 Developer regulating member 4 has one end fixedly supported to the housing 7, the other end is mounted so as to project close to the surface of the developer carrying member 3 is attracted to the developer carrying member surface development agent is a restricts a certain amount.

【0021】このような現像装置2は、現像剤担持体3 [0021] The developing device 2, the developer carrying member 3
が静電潜像保持体1と近接して対向し得る位置に設けられており、静電潜像保持体1と現像剤担持体3との間隔が0.5mm程度(現像剤担持体3上の磁気ブラシが静電潜像保持体1と接触し得る間隔)となる位置およびこれらの間隔が現像剤担持体表面に形成される磁気ブラシと静電潜像保持体表面とが接触しない程度となる位置に設定することができ、カム8の回転によって上記双方の位置の間を移動できるようになっている。 There is provided in a position that may be contiguous and opposed to the electrostatic latent image holding member 1, the spacing of about 0.5mm of the electrostatic latent image holding member 1 and the developer carrying member 3 (the developer carrying member 3 above a degree to which the magnetic brush does not contact the magnetic brush and the electrostatic latent image holding member surface position and their distance becomes distance) which may come into contact with the electrostatic latent image bearing member 1 is formed on the surface of the developer carrying member of the It can be set to a position, is adapted to be movable between a position of the both by the rotation of the cam 8.

【0022】このような現像装置は、静電潜像保持体に対して一つの現像装置のみが対向する画像形成装置に用いてもよいが、図3に示すように複数の現像装置が一つの静電潜像保持体に対向して配置され、それぞれの現像装置は色が異なる画像の現像を行うカラー画像形成装置に用いることができる。 [0022] such a developing device, only one developing device the electrostatic latent image holding member may be used in an image forming apparatus of the counterpart, but a plurality of developing devices is one as shown in FIG. 3 is facing the electrostatic latent image holding member, each of the developing device can be used for color image forming apparatus for developing an image color is different. 図3に示す画像形成装置では三つの現像装置2a,2b,2cが配列されており、それぞれがカム8a,8b,8cの回転によって、現像剤担持体3a,3b,3cの表面に形成される磁気ブラシが静電潜像保持体1と接触する位置と接触しない位置との双方に設定できるようになっている。 Three of the developing device 2a in the image forming apparatus shown in FIG. 3, 2b, 2c are arranged, each of the cam 8a, 8b, by the rotation of 8c, is formed on the developer bearing member 3a, 3b, 3c surface magnetic brush is adapted to be set to both of the position that is not in contact with the position in contact with the electrostatic latent image holding member 1.

【0023】本発明の一実施例である現像方法は、例えばこのような画像形成装置において実施することができるものであり、以下にこの実施例を説明する。 The developing method according to an embodiment of the present invention is, for example, those which can be implemented in such an image forming apparatus, illustrating this embodiment will be described below. 現像を開始する前の段階ではすべての現像装置は、現像剤担持体表面の磁気ブラシと静電潜像保持体1とが接触しない位置に設定されている。 In the stage before starting the development of all of the developing device includes a magnetic brush and an electrostatic latent image holding member 1 of the developer carrying member surface is set at a position not in contact. 現像プロセスの開始にともない静電潜像保持体1は回転して、表面が一様に帯電される。 Electrostatic latent image bearing member 1 with the start of the development process is rotated, the surface is uniformly charged.
その後、像光が照射され、照射される光の強さにしたがって静電潜像保持体1の表面には帯電電位の差による静電潜像が形成される。 Then, image light is irradiated, the electrostatic latent image holding member 1 surface according the intensity of light irradiated electrostatic latent image due to the difference of the charging potential is formed. この静電潜像は単色の画像に対応するものであり、この静電潜像に対応する色の現像装置、すなわち図3に示す第1の現像装置2aの動作が開始される。 This electrostatic latent image is intended to correspond to a single color image, the color of the developing device corresponding to the electrostatic latent image, that is, the operation of the first developing device 2a shown in FIG. 3 is started.

【0024】現像装置の動作は、図4に示すようにまず現像剤担持体3aの回転の始動とバイアス電圧の印加が同時に行われる。 The operation of the developing device, application of a start-up and bias voltage of the rotation of the first developer bearing member 3a as shown in FIG. 4 are performed simultaneously. 回転するスクリューオーガー5a、6 Rotating screw auger 5a, 6
aから現像剤担持体3aに供給された現像剤が表面において磁気ブラシを形成しており、この現像剤の層は現像剤規制部材4aによって規制された後、現像剤担持体3 The developer supplied to the developer carrying member 3a from a is forms a magnetic brush on the surface, after the layer of the developer which has been regulated by the developer regulating member 4a, the developer carrying member 3
aの回転によって連続的に現像領域へと搬送される。 It is conveyed to the continuous development area by the rotation of a. 現像剤担持体3aの回転が始動し、バイアス電圧が印加された後、カム8aが回転し、第1の現像装置2aが現像剤担持体3a上の磁気ブラシと静電潜像保持体1とが接触する位置へ移動する。 Start the rotation of the developer carrying member 3a, after the bias voltage is applied, the cam 8a rotates, the first developing device 2a is a magnetic brush and the electrostatic latent image holding member 1 on the developer carrying member 3a but to move to a position in contact. このとき現像剤担持体3aと静電潜像保持体1との間にはバイアス電界が生じており、 At this time it has occurred the bias electric field between the developer bearing member 3a and the electrostatic latent image bearing member 1,
帯電したトナーが静電潜像保持体1上の静電潜像に付着し、静電潜像を可視化する。 Charged toner adheres to the electrostatic latent image on the electrostatic latent image bearing member 1, and visualizes the electrostatic latent image.

【0025】静電潜像保持体1が回転し、静電潜像の形成された部分が現像領域を通過すると現像は終了し、カム8aが回転して第1の現像装置2aを磁気ブラシと静電潜像保持体とが接触しない位置へ戻す。 [0025] rotates the electrostatic latent image bearing member 1, developing a formed part of the electrostatic latent image passes through a developing area is terminated, the magnetic brush of the first developing device 2a cam 8a rotates electrostatic latent image holding member and returns to a position that does not contact. 静電潜像保持体1にはさらに他の色に対応する静電潜像が形成され、 An electrostatic latent image further corresponding to other colors to the electrostatic latent image holding member 1 is formed,
これに対応する現像装置すなわち第2の現像装置2bが駆動される。 Developing device or the second developing unit 2b corresponding thereto is driven. この第2の現像装置2bの動作の順序は図4に示すように第1の現像装置2aの場合と同じである。 The order of operation of the second developing device 2b is the same as that of the first developing device 2a as shown in FIG. このような工程が現像する色の種類と同じ数だけ繰り返し行われ、静電潜像保持体1上にカラー画像が形成される。 Such process is repeated by the same number as the kinds of color developing, the color image is formed on the electrostatic latent image holding member 1. このカラー画像は転写装置(図示せず)によって用紙上に転写され、定着装置によって融着される。 The color image is transferred onto the sheet by a transfer device (not shown), it is fused by the fixing device.

【0026】このような現像方法を行なった場合におけるキャリアの静電潜像保持体への付着量を調査するため、図3に示すように現像装置2a、2b、2cが静電潜像保持体1と対向する位置よりも静電潜像保持体1の回転方向における下流側にキャリアの補集手段12を設け、これによって補集されたキャリアの量を、従来の現像方法(現像剤担持体上の磁気ブラシが静電潜像保持体と接触した状態で現像剤担持体の動作の開始・停止およびバイアス電圧の印加の開始・解除を行なう)を行なった場合と比較する。 [0026] Such order to investigate the amount of adhered to the electrostatic latent image holding member of the carrier in the case of performing the developing method, a developing device 2a as shown in FIG. 3, 2b, 2c electrostatic latent image holding member 1 and the collecting means 12 of the carrier is provided on the downstream side in the rotational direction of the electrostatic latent image bearing member 1 than opposing positions, whereby the amount of carriers collecting, conventional development method (developing agent carrier compared with a case where the magnetic brush of the above was carried out performing starting and releasing the application of the start-stop and bias voltage of the operation of the developer carrying member in contact with the electrostatic latent image holding member).

【0027】図5は100回の現像を行なう間に補集手段12で補集されたキャリアの量を重量で示したものであり、本発明の実施例においては補集されたキャリアが著しく少なくなっている。 [0027] FIG. 5 shows the amount of collecting carriers by scavenged means 12 while performing 100 times of development in weight, markedly fewer carriers scavenged in the embodiment of the present invention going on. このように本実施例の現像方法では、それぞれの色の現像において静電潜像保持体1 In this way, the developing method of this embodiment, an electrostatic latent image bearing member 1 in the development of each color
に現像剤が多量に付着したり、キャリアの電荷注入による静電潜像保持体への付着が防止されるので、静電潜像保持体1の回転にムラが生じるのを防止でき、色ずれ等のない良好なカラー画像が形成される。 Or developer large amount adhered to, since the adhesion to the electrostatic latent image holding member by charge carrier injection is prevented, it is possible to prevent the unevenness occurs in the rotation of the electrostatic latent image bearing member 1, the color shift good color image is formed without the like.

【0028】 [0028]

【発明の効果】以上説明したように、本発明の現像方法では、現像剤担持体の動作開始時および停止時、ならびにバイアス電圧の印加開始時および解除時に、現像剤担持体表面に形成された磁気ブラシが静電潜像保持体と接触していないので、多量の現像剤が静電潜像保持体に付着するのが防止でき、良好な画像が得られる。 As described in the foregoing, in the developing method of the present invention, at operation start and stop of the developer carrying member, and upon application start and release of the bias voltage, which is formed on the developer carrying member surface the magnetic brush is not in contact with the electrostatic latent image holding member, a large amount of the developer is prevented from adhering to the electrostatic latent image holding member, good images are acquired. また、バイアス電圧印加開始時に、現像剤担持体は、表面の磁気ブラシが静電潜像保持体と接触しない程度に離れており、バイアス電圧下の放電による静電潜像保持体表面の損傷が防止され、画像に欠陥が生じるのを防ぐことができる。 Further, when the bias voltage application start, the developer carrying member, a magnetic brush of the surface are separated so as not to contact with the electrostatic latent image holding member, damage to the surface of the electrostatic latent image holder by discharge under a bias voltage is prevented, it is possible to prevent the defects in the image. さらに、現像剤担持体が動作していない状態で磁気ブラシが静電潜像保持体と接触することがなく、キャリアへの電荷注入によってキャリアが静電潜像保持体に付着して画像に欠陥が生じるのを防止できる。 Furthermore, without the magnetic brush is in contact with the electrostatic latent image holding member in a state where the developer carrying member is not operating, the defect in the image carrier by charge injection to the carrier adheres to the electrostatic latent image holding member it is possible to prevent the results.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の現像方法を説明するためのタイミング図である。 1 is a timing diagram for illustrating the developing method of the present invention.

【図2】本発明の一実施例である現像方法に使用することができる現像装置の一例を示す概略構成図である。 Is a schematic diagram showing an example of a developing device that can be used in the developing method according to an embodiment of the present invention; FIG.

【図3】本発明の一実施例である現像方法に使用することができるカラー画像形成装置の一部を示す概略構成図である。 Figure 3 is a schematic diagram showing a part of a color image forming apparatus which can be used in the developing method according to an embodiment of the present invention.

【図4】図3に示すカラー画像形成装置において、本発明の現像方法を実施した例を示すタイミング図である。 In the color image forming apparatus shown in FIG. 3. FIG is a timing diagram showing an example embodying the developing method of the present invention.

【図5】図3に示すカラー画像形成装置において、本発明の現像方法を実施した場合の効果を従来例と比較して示す図である。 In the color image forming apparatus shown in FIG. 5 FIG. 3 is a diagram showing a comparison with the prior art the effect of a development method has been the practice of the present invention.

【図6】従来の現像方法を説明するためのタイミング図である。 6 is a timing diagram for illustrating a conventional developing method.

【図7】バイアス電圧の印加開始時および解除時における電圧の変動を示す図である。 7 is a diagram showing a variation of the voltage at the application start time and the release of the bias voltage.

【符合の説明】 Description of the sign]

1 静電潜像保持体 2 現像装置 3 現像剤担持体 4 現像剤規制部材 5 スクリュウオーガー 6 スクリュウオーガー 7 ハウジング 8 カム 1 electrostatic latent image holding member 2 developing device 3 developer carrying member 4 developer regulating member 5 screw auger 6 screw auger 7 housing 8 cam

───────────────────────────────────────────────────── フロントページの続き (72)発明者 山下 孝幸 神奈川県海老名市本郷2274番地 富士ゼ ロックス株式会社海老名事業所内 (56)参考文献 特開 平1−202780(JP,A) 特開 平2−179663(JP,A) 実開 昭64−32560(JP,U) (58)調査した分野(Int.Cl. 6 ,DB名) G03G 15/08 - 15/095 ────────────────────────────────────────────────── ─── continued (72) inventor Takayuki Yamashita Ebina, Kanagawa Prefecture Hongo 2274 address Fuji Xerox Co., Ltd. Ebina house (56) references of the front page Patent flat 1-202780 (JP, a) JP flat 2- 179663 (JP, a) JitsuHiraku Akira 64-32560 (JP, U) (58 ) investigated the field (Int.Cl. 6, DB name) G03G 15/08 - 15/095

Claims (1)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】 磁石ロールを内蔵し、表面に二成分現像剤の磁気ブラシを形成して現像剤を搬送する現像剤担持体と、露光によって表面に静電潜像が形成される静電潜像保持体とが近接して対向する位置で、前記磁気ブラシを前記静電潜像保持体表面に接触させるとともに、前記静電潜像保持体と現像剤担持体との間にバイアス電圧を印加し、帯電した現像剤を前記静電潜像に付着させて可視化する現像方法において、前記静電潜像を現像しないときは、前記現像剤担持体を、前記磁気ブラシが静電潜像保持体に接触しない位置に保持し、前記静電潜像保持体上の静電潜像を現像するときに、バイアス電圧の印加、および現像剤担持体の動作を開始し、その後現像剤担持体を、前記磁気ブラシが動作中の前記静電潜像保持体と接触する位置に移 1. A built-in magnet roll, a developer carrying member for carrying the developer to form a magnetic brush of the two-component developer on the surface, electrostatic latent which an electrostatic latent image is formed on the surface by exposure in the position where the image carrier facing close, applying a bias voltage between the with contacting the magnetic brush to the electrostatic latent image holding member surface, and the electrostatic latent image holding member and the developer carrying member and, charged developer adhere to the electrostatic latent image in a developing process for visualizing, when not developing the electrostatic latent image, said developer carrying member, the magnetic brush is an electrostatic latent image holding member maintained at not contact position, when developing the electrostatic latent image on the electrostatic latent image holding member, the application of the bias voltage, and starts the operation of the developer carrying member, then the developer carrying member, moved to the position where the magnetic brush is in contact with the electrostatic latent image holding member in operation 動させて現像を行ない、現像終了後、再び前記現像剤担持体を、前記磁気ブラシが動作中の前記静電潜像保持体と接触しない位置に戻し、その後バイアス電圧の印加解除、および現像剤担持体の動作の停止を行なうことを特徴とする現像方法。 By moving subjected to development, after the completion of development, again the developer carrying member, back to the position where the magnetic brush does not contact with the electrostatic latent image holding member in operation, applied release subsequent bias voltage, and a developer developing method and performing a stop operation of the carrier.
JP12447091A 1991-04-30 1991-04-30 Developing method Expired - Fee Related JP2903770B2 (en)

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