JP2001215798A - Image forming device - Google Patents

Image forming device

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Publication number
JP2001215798A
JP2001215798A JP2000022017A JP2000022017A JP2001215798A JP 2001215798 A JP2001215798 A JP 2001215798A JP 2000022017 A JP2000022017 A JP 2000022017A JP 2000022017 A JP2000022017 A JP 2000022017A JP 2001215798 A JP2001215798 A JP 2001215798A
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image
developer
means
charging
transfer
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JP3647345B2 (en )
Inventor
Motonori Adachi
Masao Uyama
Yasunari Watanabe
雅夫 宇山
泰成 渡邉
元紀 足立
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Canon Inc
キヤノン株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a cleaner-less system image forming device in which developer left after transfer on an image carrier 1 after a transfer stage is removed and recovered by cleaning simultaneously with developing so as to be recycled, where faulty electrification and a faulty image are avoided by preventing the developer left after transfer from adhering to an electrifying means 2 and efficiently recovering the developer left after transfer by a developing means 4, and which makes the best use of the merit of a cleaner-less system. SOLUTION: The toner left after transfer is uniformized by a means 8 for uniformizing the toner left after transfer positioned on the downstream side of a transfer part (d), and processed to be electrified to have a normal polarity by a toner electrified amount control means 7 positioned on a more downstream side, whereby the electrified amount is made proper as soon as the surface of the image carrier 1 is electrified by the electrifying means 2.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明はクリーナレスの転写方式画像形成装置に関する。 The present invention relates to relates to transfer type image forming apparatus of a cleaner-less. より詳しくは、転写工程後の像担持体上に残余する現像剤(トナー)を現像装置において現像同時クリーニングで像担持体上から除去・回収し再利用するようにしてクリーニング装置を廃したクリーナレス方式の画像形成装置に関する。 More specifically, the cleanerless that so as to reuse removed and collected from the image bearing member in a developing-cleaning and waste the cleaning device in the developing device a developer (toner) for remaining on the image bearing member after the transfer step an image forming apparatus of a system.

【0002】 [0002]

【従来の技術】従来、転写型の電子写真方式を用いた複写機・プリンタ・ファクシミリ等の転写方式画像形成装置は、回転ドラム型を一般的とする像担持体である感光体、その感光体を所定の極性・電位に一様に帯電処理する帯電装置(帯電工程)、帯電処理された感光体に静電潜像を形成する情報書き込み手段としての露光装置(露光工程)、感光体上に形成された静電潜像を現像剤であるトナーにより顕像化する現像装置(現像工程)、上記トナー画像を感光体面から紙などの転写材に転写する転写装置(転写工程)、転写工程後の感光体上に多少ながら残余するトナーを除去して感光体面を清掃するクリーニング装置(クリーニング工程)、転写材上のトナー画像を定着させる定着装置(定着工程)などから構成されており、感光体は Conventionally, the transfer-type transfer system image forming apparatus such as a copying machine, printer, facsimile using an electrophotographic system of a photoreceptor as an image bearing member to the rotary drum-type general, the photosensitive member the charging device uniformly charged to a predetermined polarity and potential (charging step), the exposure apparatus as an information writing means for forming an electrostatic latent image on the charged photosensitive member (exposure step), on the photoreceptor a developing device for visualizing the toner which is a developer to the formed electrostatic latent image (developing step), transferring device (transfer step) of transferring to a transfer material such as paper the toner image from the photoreceptor surface, after the transfer process of the cleaning device (cleaning process) of removing the toner remaining cleaning the photoreceptor surface while somewhat on the photosensitive member is constituted by a like fixing device for fixing the toner image on the transfer material (fixing process), a photosensitive member It is り返して電子写真プロセス(帯電・ Ri returns electrophotographic process (charging,
露光・現像・転写・クリーニング)が適用されて作像に供される。 Exposure, development, transfer and cleaning) is applied is used for image formation.

【0003】転写工程後の感光体上に残余するトナーはクリーニング装置により感光体面から除去されてクリーニング装置内に溜って廃トナーとなるが、環境保全や資源の有効利用等の点からそのような廃トナーは出ないことが望ましい。 [0003] toner remaining on the photosensitive member after the transfer step is a waste toner removed from the photosensitive member surface accumulated in the cleaning device by a cleaning device, such terms of effective use of environmental protection and resource it is desirable that the waste toner does not appear.

【0004】そこで、クリーニング装置にて回収されている転写残トナーいわゆる廃トナーを現像装置に戻して再利用する画像形成装置がある。 [0004] Therefore, there is an image forming apparatus for reuse back residual toner called waste toner is recovered by the cleaning device to the developing device.

【0005】また、クリーニング装置を廃し、転写工程後の感光体上の転写残トナーを現像装置において「現像同時クリーニング」で感光体上から除去・回収し再利用するようにしたクリーナレス方式の画像形成装置がある。 Further, the cleaning device and the waste, the image of the cleaner-less scheme so as to reuse removed and collected from the photosensitive body "cleaning simultaneous with developing" transfer residual toner on the photosensitive member after the transfer step in the development device there is a forming apparatus.

【0006】現像同時クリーニングは、転写後の感光体上の転写残トナーを次工程以降の現像工程時、即ち引き続き感光体を帯電し、露光して静電潜像を形成し、該静電潜像の現像工程過程時にかぶり取りバイアス(現像装置に印加する直流電圧と感光体の表面電位間の電位差であるかぶり取り電位差Vback)によって、トナーで現像されるべきではない感光体面部分上(非画像部)に存在する転写残トナーは現像装置に回収する方法である。 [0006] cleaning simultaneous with developing is a transfer residual toner on the photosensitive member after the transfer at the next step after the development step, i.e., continue to charge the photosensitive member to form an electrostatic latent image by exposing, latent electrostatic the image development step process during the fog removing bias (difference in a fog removing potential difference Vback between the surface potential of the DC voltage applied to the developing device and the photosensitive member), not to be developed with toner photoreceptor surface on portions (non-image residual toner present on the part) is a method of recovering the developing device. この方法によれば、転写残トナーは現像装置に回収されて次工程以降の静電潜像の現像に再利用されるため、廃トナーをなくし、またメンテナンスに手を煩わせることも少なくすることができる。 According to this method, since the residual toner is recycled is collected into the developing device for developing the electrostatic latent image in the subsequent step, eliminating the waste toner, also possible to reduce the bothering maintenance can. またクリーナレスであることで画像形成装置の小型化にも有利である。 Further it is advantageous to the downsizing of the image forming apparatus by a cleanerless.

【0007】 [0007]

【発明が解決しようとする課題】a)上述したような、 The object of the invention is to be Solved a) as described above,
転写工程後の感光体上の転写残トナーを現像装置において現像同時クリーニングで除去・回収し再用するクリーナレス方式の画像形成装置において、感光体の帯電装置が感光体に当接して感光体面を帯電処理する接触帯電装置であるときには、感光体上の転写残トナーが感光体と接触帯電装置の接触ニップ部である帯電部を通過する際に、転写残トナー中の特に帯電極性が正規極性とは逆極性に反転しているトナーが接触帯電装置に付着して接触帯電装置を許容以上にトナー汚染させて帯電不良の原因となってしまう。 The image forming apparatus of a cleaner-less method to use again to remove and recover in the developing-cleaning transfer residual toner on the photosensitive member after the transfer step in the developing device, the charging device of the photoreceptor to contact with the photosensitive member surface to the photosensitive member when a contact charging device for charging process, when the transfer residual toner on the photosensitive member is passing through the charging portion which is a contact nip portion of the contact charging device and the photosensitive member, and particularly the charge polarity normal polarity in the transfer residual toner would be more acceptable to the contact charging device attached to the contact charging device toner is inverted in the reverse polarity to toner contamination caused the charging defective.

【0008】すなわち、現像剤としてのトナーには、量的には少ないけれども、帯電極性がもともと正規極性とは逆極性に反転しているトナーが混在している。 Namely, the toner as a developer, although quantitative in less toner charge polarity is reversed in the opposite polarity to the original normal polarity are mixed. また帯電極性が正規極性のトナーであっても転写バイアスや剥離放電等に影響されて帯電極性が反転するものや、除電されて帯電量が少なくなるものもある。 There is also a charge polarity even with toner of the regular polarity is affected by the transfer bias and separation discharge or the like and that the charging polarity is reversed, while others charge quantity is discharged is reduced.

【0009】従って、転写残トナーには帯電極性が正規極性のもの、逆極性の反転トナー、帯電量が少ないものが混在しており、その内の反転トナーや帯電量が少ないトナーが感光体と接触帯電装置の接触ニップ部である帯電部を通過する際に接触帯電装置に付着し易い。 Accordingly, those charge polarity to the transfer residual toner is normal polarity, opposite polarity reversal toner, those charge amount is small are mixed, inverted toner and the charge amount is small toner of which the photoconductor liable to adhere to the contact charging device when passing through the charging portion which is a contact nip portion of the contact charging device.

【0010】b)また、感光体上の転写残トナーを現像装置の現像同時クリーニングにて除去・回収するためには、帯電部を通過して現像部に持ち運ばれる感光体上の転写残トナーの帯電極性が正規極性であり、かつその帯電量が現像装置によって感光体の静電潜像を現像できるトナーの帯電量であることが必要である。 [0010] b) In order to remove and recover the residual toner on the photosensitive member by a developing-cleaning of the developing device, the transfer residual toner on the photosensitive member to be carried to the developing section through the charging portion the polarity of the charge is normal polarity, and it is necessary that the charge amount is the charge amount of the toner that can develop the electrostatic latent image on the photoconductor by the developing device. 反転トナーや帯電量が適切でないトナーについては感光体上から現像装置に除去・回収できず、不良画像の原因となってしまう。 For inverted toner and the charge amount is not appropriate toner can not be removed and collected into the developing device from the photosensitive member, thus causing a defective image.

【0011】c)上記a)の接触帯電装置へのトナーの付着は、転写部から帯電部へ持ち運ばれる、帯電極性が正規極性のもの、逆極性のもの、帯電量が少ないものが混在している感光体上の転写残トナーをトナー帯電量制御手段によって正規極性へと帯電付与して帯電極性を正規極性に揃えるとともに帯電量を均一化することにより防止することができる。 [0011] c) adhesion of the toner to the contact charging device of a) above is carried to the charging unit from the transfer unit, those charge polarity of normal polarity, opposite polarity ones, those charge amount is small are mixed the transfer residual toner on the photosensitive member has a charge polarity and charge imparting to the normal polarity by the toner charge amount controlling means can be prevented by equalizing the charge amount with aligned to normal polarity.

【0012】しかしながら、接触帯電装置へのトナーの付着を防止するためにトナー帯電量制御手段によって帯電付与された転写残トナーは、感光体の静電潜像を現像できるトナーの帯電量に比べて大きいため、現像装置において現像同時クリーニングにて除去・回収されにくいのである。 [0012] However, the transfer residual toner charged imparted by the toner charge amount controlling means for preventing the adhesion of the toner to the contact charging device, as compared with the charge amount of the toner that can develop the electrostatic latent image on the photoconductor big Therefore, it is hard to be removed and recovered by the developing-cleaning in the developing device. このような場合、感光体に残留するトナーは次の画像へと重なり、不良画像を起こしてしまうのである。 In this case, toner remaining on the photosensitive member overlaps with the next image, it from being cause defective images.

【0013】また、近年のユーザニーズの多様化に伴い、写真画像などといった高印字率な画像の連続印字動作や、カラー化に伴い感光体上への多重現像方式などにより、一度に大量の転写残トナーの発生により、上述のような問題を更に助長させてしまうのである。 Furthermore, with the diversification of recent users' needs, a continuous printing operation and high printing ratio images, such as photographic images, such as by multiple development system onto the photosensitive member due to the color of a large amount of transfer at a time the occurrence of residual toner is from being further conducive to the above-mentioned problem.

【0014】そこで本発明は、転写工程後の像担持体上の転写残現像剤を現像同時クリーニングで除去・回収し再用するクリーナレス方式の画像形成装置について、帯電手段への転写残現像剤の付着を防止するとともに、現像手段での転写残現像剤の回収も効率的になされるようにすることで、帯電不良や不良画像がなく、しかもクリーナレスシステムのメリットを生かした画像形成装置を提供することを目的とする。 [0014] The present invention, an image forming apparatus of a cleaner-less method to use again to remove and recover the transfer residual developer on the image bearing member after the transfer step in cleaning simultaneous with developing, transfer residual developer to the charging means thereby preventing adhesion of, also the recovery of the transfer residual developer in the developing means by to be done efficiently, without charging failure or poor image, yet the image forming apparatus utilizing the advantage of cleaner-less system an object of the present invention is to provide.

【0015】 [0015]

【課題を解決するための手段】本発明は下記の構成を特徴とする画像形成装置である。 The present invention SUMMARY OF THE INVENTION is an image forming apparatus characterized the following configuration.

【0016】(1)像担持体と、像担持体面を帯電する帯電手段と、帯電処理された像担持体に静電潜像を形成する情報書き込み手段と、静電潜像に現像剤を供給し静電潜像を可視化する現像手段と、可視化した現像剤像を転写材に転写する転写手段と、前記帯電手段より上流に位置していて、像担持体面上の現像剤を帯電する現像剤帯電量制御手段と、前記現像剤帯電量制御手段より上流かつ前記転写手段より下流に位置していて、前記現像剤像を転写材に転写した後の像担持体面上に残留する残留現像剤像を均一化する残留現像剤像均一化手段と、を有し、現像剤像転写後の像担持体上に残留する残留現像剤像を前記残留現像剤像均一化手段で均一化し、その均一化された像担持体上の残留現像剤を前記現像剤帯電量制御手段で正規極性 [0016] (1) image bearing member, a charging unit that charges the image bearing member surface, and information writing means for forming an electrostatic latent image on an image bearing member which has been charged, the developer to the electrostatic latent image supply a developing unit for visualizing an electrostatic latent image, and a transfer unit that transfers a transfer material a developer image visualized and located upstream of said charging means, a developing agent for charging the developer on the image bearing member surface a charge amount control means, the developer upstream and from the charge amount control means located downstream from said transfer means, the residual developer image remaining the developer image on the image bearing member surface after the transfer to the transfer material the has a residual developer image uniformizing means for uniformizing, and then homogenizing the residual developer image remaining on the image bearing member after the developer image is transferred by the remaining developer image uniformizing means, its uniform regular polarity has been the residual developer on the image carrier in the developer charge amount controlling means 帯電処理し、前記帯電手段で前記像担持体面を帯電すると同時に、適正帯電量にすることを特徴とした画像形成装置。 Charged and, at the same time as charging the image bearing member surface by the charging unit, an image forming apparatus, characterized in that a proper charge quantity.

【0017】(2)前記帯電手段は接触帯電方式であることを特徴とする(1)の画像形成装置。 [0017] (2) The image forming apparatus of the charging means is characterized by a contact charging method (1).

【0018】(3)前記帯電手段に振動電界を印加することを特徴とする(1)または(2)の画像形成装置。 [0018] (3) wherein applying an oscillating electric field to the charging means, characterized in (1) or the image forming apparatus (2).

【0019】(4)前記情報書き込み手段は露光手段であることを特徴とする(1)ないし(3)のいずれかの画像形成装置。 [0019] (4) the information writing means any of the image forming apparatus of (1), characterized in that the exposure means (3).

【0020】(5)前記残留現像剤像均一化手段が前記像担持体に対して電位差を有する電極部から構成されていることを特徴とする(1)ないし4のいずれかの画像形成装置。 [0020] (5) the residual developing agent image uniformizing means is characterized by being composed of the electrode portion having a potential difference with respect to the image bearing member (1) to any of the image forming apparatus 4.

【0021】(6)像担持体と、像担持体面を帯電する帯電手段と、帯電処理された像担持体に静電潜像を形成する情報書き込み手段と、静電潜像に現像剤を供給し静電潜像を可視化する現像手段と、可視化した現像剤像を転写材に転写する転写手段と、前記帯電手段より上流に位置していて、像担持体面上の現像剤を帯電する現像剤帯電量制御手段と、前記現像剤帯電量制御手段より上流かつ前記転写手段より下流に位置していて、前記現像剤像を転写材に転写した後の像担持体面上に残留する残留現像剤像を均一化する残留現像剤像均一化手段と、を有し、現像剤像転写後の像担持体上に残留する残留現像剤像を前記残留現像剤像均一化手段で均一化し、その均一化された像担持体上の残留現像剤を前記現像剤帯電量制御手段で正規極性 [0021] and (6) image bearing member, a charging means for charging the image bearing member surface, and information writing means for forming an electrostatic latent image on an image bearing member which has been charged, the developer to the electrostatic latent image supply a developing unit for visualizing an electrostatic latent image, and a transfer unit that transfers a transfer material a developer image visualized and located upstream of said charging means, a developing agent for charging the developer on the image bearing member surface a charge amount control means, the developer upstream and from the charge amount control means located downstream from said transfer means, the residual developer image remaining the developer image on the image bearing member surface after the transfer to the transfer material the has a residual developer image uniformizing means for uniformizing, and then homogenizing the residual developer image remaining on the image bearing member after the developer image is transferred by the remaining developer image uniformizing means, its uniform regular polarity has been the residual developer on the image carrier in the developer charge amount controlling means 帯電処理し、前記帯電手段で前記像担持体面を帯電すると同時に、前記現像剤帯電量制御手段で帯電処理された時の帯電量の絶対値よりも小さい絶対値の帯電量にすることを特徴とした画像形成装置。 Charging processes, and wherein the charging means and at the same time charging the image bearing member surface, to the charge amount of the smaller absolute value than the absolute value of the charge amount when the is charged by the developer charging amount controlling means an image forming apparatus.

【0022】(7)前記帯電手段は接触帯電方式であることを特徴とする(6)の画像形成装置。 [0022] (7) The image forming apparatus of the charging means is characterized by a contact charging system (6).

【0023】(8)前記帯電手段に振動電界を印加することを特徴とする(6)または(79の画像形成装置。 [0023] (8) The applying an oscillating electric field to the charging means, characterized in (6) or (79 image forming apparatus.

【0024】(9)前記情報書き込み手段は露光手段であることを特徴とする(6)ないし(8)のいずれかの画像形成装置。 [0024] (9) the information writing means any of the image forming apparatus to (6) through, characterized in that the exposure means (8).

【0025】(10)前記残留現像剤像均一化手段が前記像担持体に対して電位差を有する電極部から構成されていることを特徴とする(6)ないし(9)のいずれかの画像形成装置。 [0025] (10) any of the image forming to the residual developer image equalizing means (6) through, characterized in that it is constituted from the electrode portion having a potential difference with respect to the image bearing member (9) apparatus.

【0026】(11)像担持体と、像担持体面を帯電する帯電手段と、帯電処理された像担持体に静電潜像を形成する情報書き込み手段と、静電潜像に現像剤を供給し静電潜像を可視化する現像手段と、可視化した現像剤像を転写材に転写する転写手段と、前記帯電手段より上流に位置していて、像担持体面上の現像剤を帯電する現像剤帯電量制御手段と、前記現像剤帯電量制御手段より上流かつ前記転写手段より下流に位置していて、前記現像剤像を転写材に転写した後の担持体面上に残留する残留現像剤像を均一化する残留現像剤像均一化手段と、を有し、現像剤像転写後の像担持体上に残留する残留現像剤像を前記残留現像剤像均一化手段で均一化し、その均一化された像担持体上の残留現像剤を前記現像剤帯電量制御手段で前記現像 [0026] and (11) image bearing member, a charging means for charging the image bearing member surface, and information writing means for forming an electrostatic latent image on an image bearing member which has been charged, the developer to the electrostatic latent image supply a developing unit for visualizing an electrostatic latent image, and a transfer unit that transfers a transfer material a developer image visualized and located upstream of said charging means, a developing agent for charging the developer on the image bearing member surface a charge amount control means, said upstream developer charging amount controlling means and be located downstream of the transfer unit, the residual developer image remaining the developer image on the bearing member surface after the transfer to the transfer material It has a residual developer image uniformizing means for uniformizing, and then homogenizing the residual developer image remaining on the image bearing member after the developer image is transferred by the remaining developer image uniformizing means is the uniform the developing and the residual developer on the image carrier in the developer charge amount controlling means 段後の現像剤帯電量の2.2倍以上の帯電量でかつ正規極性に帯電処理し、前記帯電手段で前記像担持体面を帯電すると同時に、前記現像手段後の現像剤帯電量の0.5〜1.8倍の帯電量にすることを特徴とした画像形成装置。 At the same time and a 2.2-fold or more charge amount of the developer charge amount after stage it was charged to a normal polarity, to charge the image bearing member surface by the charging unit, 0 of the developer charge amount after the developing unit. image forming apparatus, characterized in that the 5 to 1.8 times the amount of charge.

【0027】(12)前記帯電手段は接触帯電方式であることを特徴とする(11)の画像形成装置。 [0027] (12) The image forming apparatus of the charging means is characterized by a contact charging system (11).

【0028】(13)前記帯電手段に振動電界を印加することを特徴とする(11)または(12)の画像形成装置。 [0028] (13) The image forming apparatus applying the oscillating electric field in the charging means and said (11) or (12).

【0029】(14)前記情報書き込み手段は露光手段であることを特徴とする(11)ないし(13)のいずれかの画像形成装置。 [0029] (14) said information writing means is characterized by an exposure means (11) to any of the image forming apparatus (13).

【0030】(15)前記残留現像剤像均一化手段が前記像担持体に対して電位差を有する電極部から構成されていることを特徴とする(11)ないし(14)のいずれかの画像形成装置。 [0030] (15) any of the image forming to the residual developer image equalizing means (11) to be characterized by being composed of the electrode portion having a potential difference with respect to the image carrier (14) apparatus.

【0031】〈作 用〉即ち本発明は、転写工程後の像担持体上の転写残現像剤(転写残トナー)を現像手段において現像同時クリーニングで除去・回収し再用するクリーナレス方式の画像形成装置について、転写残現像剤の像担持体上の分布を均一化し、トリボを制御し、クリーナレスシステムのメリットを得るものであり、転写残現像剤のトリボを、現像剤帯電量制御手段で正規極性に帯電処理し、帯電手段で適正帯電量にするものであり、 a)転写部から帯電部へ持ち運ばれる像担持体上の転写残現像剤のトリボを現像剤帯電量制御手段で正規極性に帯電処理することで転写残現像剤の帯電手段への付着を防止しつつ、 b)帯電手段で像担持体面を所定の電位に帯電すると同時に、上記の現像剤帯電量制御手段で正規極性に帯電処理さ [0031] <for work> The present invention provides an image of the cleaner-less method to re-use to remove and recover in cleaning simultaneous with developing in a developing unit transfer residual developer on the image carrier after the transfer process (transfer residual toner) for forming apparatus, and uniform distribution on the image bearing member of the transfer residual developer, to control the triboelectric charge is intended to obtain the benefits of cleaner-less system, the triboelectric charge of the transfer residual developer, in developer charge amount controlling means was charged to a normal polarity, is intended to a proper charge amount by the charging means, a) normal the triboelectricity of the transfer residual developer on the image bearing member to be carried to the charging unit from the transfer unit in developer charge amount controlling means while preventing the adhesion to the charging means of the transfer residual developer by charged to polarity, b) simultaneously with the charge the image bearing member surface to a predetermined potential by the charging means, normal polarity by the developer charge amount controlling means the charging process is to た転写残現像剤の帯電量を、現像手段によって像担持体の静電潜像を現像できる適正帯電量に制御することで現像手段での転写残現像剤の回収も効率的になされるようにした。 The charge quantity of the transfer residual developer was, as the recovery of the transfer residual developer in the developing unit by controlling a proper charge quantity which can develop the electrostatic latent image on the image bearing member is also made efficient by the developing means did.

【0032】c)上記において帯電手段よる転写残現像剤の適正帯電量とは、より具体的には、現像剤帯電量制御手段で帯電処理されたときの帯電量の絶対値よりも小さい絶対値の帯電量である。 [0032] c) In a proper charge quantity of the transfer residual developer by charging means described above, more specifically, the charge amount of the absolute value smaller absolute value than when it is charged with developer charge amount controlling means is the amount of charge. さらには現像剤帯電量制御手段で現像手段後の現像剤帯電量の2.2倍以上の帯電量でかつ正規極性に帯電処理され、帯電手段で像担持体面を帯電すると同時に、現像手段後の現像剤帯電量の0.5〜1.8倍の帯電量とされることである。 Further are charged to and normal polarity charging amount of more times 2.2 developer charge amount after developing unit with a developer charge amount controlling means, and simultaneously charge the image bearing member surface by charging means, after development means it is to be a 0.5 to 1.8 times the charge amount of the developer charge amount.

【0033】d)残留現像剤像均一化手段は、転写部から現像剤帯電量制御手段部へ持ち運ばれる像担持体上のパターン状の転写残現像剤像を、その現像剤を像担持体面に分散分布化して、非パターン化する手段である。 [0033] d) residual developer image uniformizing means is a patterned transfer residual developer image on the image bearing member to be carried to the developer charge amount controlling means unit from the transfer unit, the image bearing member surface that developer distributed distributed into a means for non-patterned. 具体的には、像担持体面を摺擦部材で摺擦することで残留現像剤像パターンを掻き崩し或は攪乱して現像剤を像担持体面に分散分布化する。 Specifically, the dispersion profile of the developer to the image bearing member surface break off the residual developer image pattern by rubbing the image bearing member surface by rubbing member or disrupting to. 像担持体面上の残留現像剤像の現像剤を捕集部材に捕集させ、その捕集現像剤を像担持体面に分散分布状態で再付着させる、などの手段である。 To collect the developer residual developer image on the image bearing member surface to the collecting member, thereby re-attaching the collection developer dispersed distribution on the image bearing member surface, a means such as.

【0034】この残留現像剤像均一化手段が有ることで、次の現像剤帯電量制御手段による転写残留現像剤の全体的な正規極性帯電化処理が常に十分になされて、転写残現像剤の帯電手段への付着防止が効果的になされる。 [0034] By this residual developer image equalizing means is, in overall normal polarity zones electrification process of the transfer residual developer by following developer charge amount controlling means is always sufficiently made, the transfer residual developer preventing adhesion to the charging means it is effectively done. また残留現像剤像パターンは消去されることで該残留現像剤像パターンのゴースト像の発生が厳に防止される。 The residual developer image pattern ghost image of the residual developer image pattern is prevented strictly by being erased.

【0035】すなわち、残留現像剤像均一化手段が無い場合は、例えば、縦ラインパターン現像剤像、環境、紙種(転写紙)、カラー2次色など、現像剤像の転写性が悪い時には、像担持体上のパターン状の転写残留現像剤像の現像剤量も多くなり、その転写残留現像剤像がそのまま現像剤帯電量制御手段部へ持ち運ばれて現像剤帯電量制御手段の一部に現像剤が集中してしまうことで、該現像剤帯電量制御手段の一部で残留現像剤の帯電量を制御しきれない現象(トナー帯電不良現象)をおこし、その結果、帯電部材汚れ→帯電不良→カブリ画像発生となってしまう。 [0035] That is, if there is no remaining developer the equalizing means, for example, the vertical line pattern developer image, environment, paper type (transfer paper), the color secondary color such as, when a poor transfer of the developer image , the amount of developer patterned transfer residual developer image on the image bearing member becomes large, one that transfer residual developer image is directly carried to the developer charge amount controlling means section developer charge amount controlling means by developer section is concentrated, causing a phenomenon that can not be controlled charge quantity of some residual developer of the developer charge amount controlling means (toner charging failure phenomena), as a result, the charging member contamination → becomes faulty charging → fog image generated. また残留現像剤像パターンが残ってそのゴースト像が発生することにもなる。 Also the ghost image is also will occur remains residual developer image pattern.

【0036】残留現像剤像均一化手段を設けることにより、上記のように、転写部から現像剤帯電量制御手段部へ持ち運ばれる像担持体上のパターン状の転写残現像剤像は現像剤量が多くても、その現像剤が像担持体面に分散分布化され、非パターン化されるので、現像剤帯電量制御手段の一部に現像剤が集中することがなくなり、該現像剤帯電量制御手段による転写残留現像剤の全体的な正規極性帯電化処理が常に十分になされて、転写残現像剤の帯電手段への付着防止が効果的になされる。 [0036] By providing the equalizing means residual developer image, as described above, pattern transfer residual developer image on the image bearing member to be carried to the developer charge amount controlling means unit from the transfer portion developer even much amount, its developer is dispersed distribution of the image bearing member surface, because they are unpatterned, prevents the developer on a part of the developer charge amount controlling means is concentrated, the developer charge amount overall normal polarity zones electrification process of the transfer residual developer by the control means is always fully achieved, preventing adhesion to the charging means of the transfer residual developer is effectively done. 残留現像剤像パターンのゴースト像の発生も厳に防止される。 Ghost image of the residual developer image pattern is prevented strictly.

【0037】 [0037]

【発明の実施の形態】〈実施例1〉以下、実施例の画像形成装置(画像記録装置)について説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS <Embodiment 1> Hereinafter, a description is given of an image forming apparatus in embodiment (image recording apparatus).

【0038】図1は本発明に従う画像形成装置例の概略構成模型図である。 [0038] Figure 1 is a schematic configuration model view of an image forming apparatus example according to the present invention. 本例の画像形成装置は、転写方式電子写真プロセス利用、接触帯電方式、反転現像方式、クリーナレス、最大通紙サイズがA3サイズのレーザビームプリンタである。 The image forming apparatus of this example, transfer type electrophotographic process, a contact charging method, reversal development method, a cleaner-less, the maximum paper feed size is a laser beam printer of A3 size.

【0039】(1)プリンタの全体的概略構成 a)像担持体 1は像担持体としての回転ドラム型の電子写真感光体(以下、感光ドラムと記す)である。 [0039] (1) Overall schematic structure a) image bearing member 1 is a rotating drum-type electrophotographic photosensitive member as an image bearing member of the printer (hereinafter, it is referred to as a photosensitive drum). この感光ドラム1 The photosensitive drum 1
は負帯電性の有機光導電体(OPC)で、外径50mm In negatively chargeable organic photoconductor (OPC), an outer diameter of 50mm
であり、中心支軸を中心に100mm/secのプロセススピード(周速度)をもって矢示の反時計方向に回転駆動される。 , And the rotationally driven in a counterclockwise direction arrow shows with process speed of 100 mm / sec to about a central shaft (peripheral speed).

【0040】この感光ドラム1は、図2の層構成模型図のように、アルミニウム製シリンダ(導電性ドラム基体)1aの表面に、光の干渉を抑え、上層の接着性を向上させる下引き層1bと、光電荷発生層1cと、電荷輸送層1dの3層を下から順に塗り重ねた構成をしている。 [0040] The photosensitive drum 1 is, as the layer structure model diagram of FIG. 2, the surface of an aluminum cylinder (conductive drum substrate) 1a, suppressing the interference of light, the undercoat layer to improve the layer of adhesive and 1b, and a photogenerating layer 1c, and configuration recoated in sequence from the bottom three layers of the charge transport layer 1d is.

【0041】b)帯電手段 2は感光ドラム1の周面を一様に帯電処理する帯電手段としての接触帯電装置(接触帯電器)であり、本例は帯電ローラ(ローラ帯電器)である。 [0041] b) charging means 2 is a contact charging device as a charging means for uniformly charged peripheral surface of the photosensitive drum 1 (contact charger), this example is a charging roller (roller charging assembly).

【0042】この帯電ロ一ラ2は、芯金2aの両端部をそれぞれ不図示の軸受け部材により回転自在に保持させると共に、押し圧ばね2eによって感光ドラム方向に付勢して感光ドラム1の表面に対して所定の押圧力をもって圧接させており、感光ドラム1の回転に従動して回転する。 [0042] The charging b one la 2, both end portions of the core metal 2a causes rotatably held by a bearing member (not shown), respectively, pressing force by the spring 2e urges the photosensitive drum direction surface of the photosensitive drum 1 and it is pressed against with a predetermined pressing force to be rotated by the rotation of the photosensitive drum 1. 感光ドラム1と帯電ローラ2との圧接部が帯電部(帯電ニップ部)aである。 Pressure-contact portion between the photosensitive drum 1 and the charging roller 2 is a charging unit (charging nip) a.

【0043】帯電ローラ2の芯金2aには電源S1より所定の条件の帯電バイアス電圧が印加されることにより回転感光ドラム1の周面が所定の極性・電位に接触帯電処理される。 The peripheral surface of the rotating photosensitive drum 1 is contacted charged to a predetermined polarity and potential by a charging bias voltage having a predetermined condition from the power source S1 is the core metal 2a of the charging roller 2 is applied. 本例において、帯電ローラ2に対する帯電バイアス電圧は直流電圧(Vdc)と交流電圧(Va In this example, the charging bias voltage to the charging roller 2 a DC voltage (Vdc) and an AC voltage (Va
c)とを重畳した振動電圧である。 c) a an oscillating voltage obtained by superposing an.

【0044】より具体的には、 直流電圧;−500V 交流電圧;周波数f1000Hz、ピーク間電圧Vpp1 [0044] More specifically, the DC voltage; -500 V AC voltage; frequency F1000Hz, peak-to-peak voltage Vpp1
400V、正弦波とを重畳した振動電圧であり、感光ドラム1の周面は−500V(暗電位Vd)に一様に接触帯電処理される。 400V, a vibration voltage obtained by superimposing a sine wave, the peripheral surface of the photosensitive drum 1 is uniformly contact charging process -500 V (dark potential Vd).

【0045】帯電ローラ2の長手長さは320mmであり、図2の層構成模型図のように、芯金(支持部材)2 The longitudinal length of the charging roller 2 is 320 mm, as the layer structure model diagram of FIG. 2, the core metal (supporting member) 2
aの外回りに、下層2bと、中間層2cと、表層2dを下から順次に積層した3層構成である。 Around the outside of a, and the lower layer 2b, a middle layer 2c, a three-layer structure obtained by sequentially stacking a surface layer 2d from below. 下層2bは帯電音を低減するための発泡スポンジ層であり、中間層2c Lower 2b is a foamed sponge layer for reducing charging noise, the intermediate layer 2c
は帯電ローラ全体として均一な抵抗を得るための導電層であり、表層2dは感光ドラム1上にピンホール等の欠陥があってもリークが発生するのを防止するために設けている保護層である。 Is a conductive layer for obtaining uniform resistance as a whole charging roller, the surface layer 2d is a protective layer which is provided in order to prevent the leakage even if defects such as pinholes on the photosensitive drum 1 is generated is there.

【0046】より具体的には、本例の帯電ロ一ラ2の仕様は下記のとおりである。 [0046] More specifically, specifications of the charge b one la 2 of the present embodiment are as follows.

【0047】 芯金2a ;直径6mmのステンレス丸棒 下層2b ;カーボン分散の発泡EPDM、比重0.5 The core metal 2a; 6mm diameter stainless steel rod lower 2b; carbon dispersion of the foamed EPDM, the specific gravity 0.5
g/cm 3 、体積抵抗値10 2 〜10 9 Ωcm、層厚3.0mm、長さ320mm 中間層2c;カーボン分散のNBR系ゴム、体積抵抗値10 2 〜10 5 Ωcm、層厚700μm 表層2d ;フッ素化合物のトレジン樹脂に酸化錫、カーボンを分散、体積抵抗値10 7 〜10 10 Ωcm、表面粗さ(JIS規格10点平均表面粗さRa)、1.5μ g / cm 3, a volume resistivity 10 2 to 10 9 [Omega] cm, thickness 3.0 mm, length 320mm intermediate layer 2c; NBR rubber dispersion of the carbon, volume resistivity 10 2 to 10 5 [Omega] cm, thickness 700μm surface 2d ; Toresin resin tin oxide fluorine compound, dispersed carbon, volume resistivity 10 7 to 10 10 [Omega] cm, the surface roughness (JIS standard 10-point average surface roughness Ra), 1.5 microns
m、層厚10μm 図2において、2fは帯電ローラクリーニング部材であり、本例では可撓性を持つクリーニングフィルムである。 m, in thickness 10μm Figure 2, 2f denotes a charging roller cleaning member, in this example is a cleaning film having flexibility. このクリーニングフィルム2fは帯電ローラ2の長手方向に対し平行に配置され且つ同長手方向に対し一定量の往復運動をする支持部材2gに一端を固定され、自由端側近傍の面において帯電ローラ2と接触ニップを形成するよう配置されている。 The cleaning film 2f is fixed at one end to the support member 2g which a certain amount of reciprocal movement with respect to parallel arranged and the longitudinal direction to the longitudinal direction of the charging roller 2, the charge roller 2 in terms of the neighboring free end They are arranged to form a contact nip. 支持部材2gがプリンタの駆動モーターによりギア列を介して長手方向に対し一定量の往復運動駆動されて帯電ローラ表層2dがクリーニングフィルム2fで摺擦される。 Supporting member 2g charging roller surface layer 2d is a certain amount of reciprocation drive to the longitudinal direction via a gear train by the driving motor of the printer is rubbed by the cleaning film 2f. これにより帯電ローラ表層2dの付着汚染物(微粉トナー、外添剤など)の除去がなされる。 Thus adhering contaminants of the charging roller surface layer 2d (fine toner, external additive, etc.) removal is made.

【0048】c)情報書き込み手段 3は帯電処理された感光ドラム1の面に静電潜像を形成する情報書き込み手段としての露光装置であり、本例は半導体レーザを用いたレーザビームスキャナである。 [0048] c) information writing means 3 is an exposure apparatus as an information writing means for forming an electrostatic latent image on the surface of the photosensitive drum 1 is charged, the present embodiment is a laser beam scanner using a semiconductor laser . 不図示の画像読み取り装置等のホスト装置からプリンタ側に送られた画像信号に対応して変調されたレーザ光を出力して回転感光ドラム1の一様帯電処理面を露光位置b Not shown in the image reading apparatus such as a uniformly charged surface to an exposure position b of the host device printer side sent image signals to the rotatable photosensitive outputs a laser beam modulated in correspondence drum 1 from
においてレーザ走査露光L(イメージ露光)する。 Laser scanning exposure L (image exposure) in the. このレーザ走査露光Lにより感光ドラム1面のレーザ光で照射されたところの電位が低下することで回転感光ドラム1面には走査露光した画像情報に対応した静電潜像が順次に形成されていく。 An electrostatic latent image potential was irradiated with a laser beam the photosensitive drum 1 surface is corresponding to the image information scanned and exposed on the rotating photosensitive drum 1 surface by reduced by the laser scanning exposure L is sequentially formed go.

【0049】d)現像手段 4は感光ドラム1上の静電潜像に現像剤(トナー)を供給し静電潜像を可視化する現像手段としての現像装置(現像器)であり、本例は二成分磁気ブラシ現像方式の反転現像装置である。 [0049] d) a developing means 4 is a developing device as a developing unit for visualizing an electrostatic latent image by supplying a developer (toner) to the electrostatic latent image on the photosensitive drum 1 (developing device), the present embodiment it is a reversal development device of a two-component magnetic brush developing method.

【0050】4aは現像容器、4bは非磁性の現像スリーブであり、この現像スリーブ4bはその外周面の一部を外部に露呈させて現像容器4a内に回転可能に配設してある。 [0050] 4a is developing container, 4b is a developing sleeve of non-magnetic, the developing sleeve 4b is are disposed rotatably a portion of its outer peripheral surface to expose to the outside the developing container 4a. 4cは非回転に固定して現像スリーブ4b内に挿設したマグネットローラ、4dは現像剤コーティングブレード、4eは現像容器4aに収容した二成分現像剤、4fは現像容器4a内の底部側に配設した現像剤攪拌部材、4gはトナーホッパーであり、補給用トナーを収容させてある。 4c is inserted to the magnet roller in the developing sleeve 4b is fixed to a non-rotating, 4d developer coating blade, 4e is a two-component developer contained in the developing container 4a, 4f is distributing on the bottom side in the developing container 4a setting the developer stirring member, 4g is a toner hopper, are to accommodate the supply toner.

【0051】現像容器4a内の二成分現像剤4eはトナーと磁性キャリアの混合物であり、現像剤攪拌部材4f The two-component developer 4e in the developing container 4a is a mixture of toner and magnetic carrier, a developer stirring member 4f
により攪拌される。 It is stirred by. 本例において磁性キャリアの抵抗は約10 13 Ωcm、粒径は約40μmである。 Resistance of the magnetic carrier in this example about 10 13 [Omega] cm, the particle size is about 40 [mu] m. トナーは磁性キャリアとの摺擦により負極性に摩擦帯電される。 Toner is triboelectrically charged to the negative polarity by the friction with the magnetic carrier.

【0052】現像スリーブ4bは感光ドラム1との最近接距離(S−Dgapと称する)を350μmに保たせて感光ドラム1に近接させて対向配設してある。 [0052] developing sleeve 4b is are then closest distance (referred to as S-Dgap) is brought close to the photosensitive drum 1 by kept 350μm oppositely disposed to the photosensitive drum 1. この感光ドラム1と現像スリーブ4aとの対向部が現像部cである。 Opposing portion between the photosensitive drum 1 and the developing sleeve 4a is developing portion c. 現像スリーブ4bは現像部cにおいて感光ドラム1の進行方向とは逆方向に回転駆動される。 Developing sleeve 4b is rotated in the direction opposite to the traveling direction of the photosensitive drum 1 at the developing portion c. この現像スリーブ4bの外周面に該スリーブ内のマグネットローラ4cの磁力により現像容器4a内の二成分現像剤4eの一部が磁気ブラシ層として吸着保持され、該スリーブの回転に伴い回転搬送され、現像剤コーティングブレード4dにより所定の薄層に整層され、現像部cにおいて感光ドラム1の面に対して接触して感光ドラム面を適度に摺擦する。 Some of the two-component developer 4e on the outer peripheral surface in the developing container 4a by the magnetic force of the magnet roller 4c in the sleeve of the developing sleeve 4b is held by suction as a magnetic brush layer, it is rotated and conveyed with the rotation of the sleeve, are advice service in a predetermined thin layer by the developer coating blade 4d, moderately rubs the photosensitive drum surface in contact with the surface of the photosensitive drum 1 at the developing portion c. 現像スリーブ4bには電源S2から所定の現像バイアスが印加される。 Predetermined developing bias from a power source S2 are the developing sleeve 4b is applied. 本例において、現像スリーブ4bに対する現像バイアス電圧は直流電圧(Vdc)と交流電圧(Vac)とを重畳した振動電圧である。 In this example, the developing bias voltage to the developing sleeve 4b is the vibrating voltage formed by superimposing a DC voltage (Vdc) and an AC voltage (Vac). より具体的には、 直流電圧;−350V 交流電圧;1600V とを重畳した振動電圧である。 More specifically, a DC voltage; an oscillating voltage obtained by superimposing the 1600 V; -350 V AC voltage.

【0053】而して、回転する現像スリーブ4bの面に薄層としてコーティングされ、現像部cに搬送された現像剤中のトナー分が現像バイアスによる電界によって感光ドラム1面に静電潜像に対応して選択的に付着することで静電潜像がトナー画像として現像される。 [0053] In Thus, coated in a thin layer on the surface of the developing sleeve 4b is rotated, the toner content in the developer conveyed to the developing portion c is an electrostatic latent image on the photosensitive drum 1 surface by the electric field by the developing bias an electrostatic latent image is developed as a toner image by selectively adhere correspondingly. 本例の場合は感光ドラム1面の露光明部にトナーが付着して静電潜像が反転現像される。 For this example an electrostatic latent image is reversely developed by toner adheres to the exposed bright portion of the photosensitive drum 1 surface.

【0054】このとき感光ドラム上に現像されたトナーの帯電量は−25μC/gである。 [0054] charge quantity at this time the toner developed on the photosensitive drum is -25 / g.

【0055】現像部cを通過した現像スリーブ4b上の現像剤薄層は引き続く現像スリーブの回転に伴い現像容器4a内の現像剤溜り部に戻される。 [0055] thin developer layer on the developing sleeve 4b having passed through the developing portion c is returned to the developer reservoir section in the developing container 4a in accordance with the rotation of the subsequent developing sleeve.

【0056】現像容器4a内の二成分現像剤4eのトナー濃度を所定の略一定範囲内に維持させるために、現像容器4a内の二成分現像剤4eのトナー濃度が不図示の例えば光学式トナー濃度センサーによって検知され、その検知情報に応じてトナーホッパー4gが駆動制御されて、トナーホッパー内のトナーが現像容器4a内の二成分現像剤4eに補給される。 [0056] developed to make the toner density of the two-component developer 4e in the container 4a is kept within a predetermined substantially constant range, the two-component developer 4e example optical toner in the toner density is not shown in the developing container 4a is detected by the density sensor, the toner hopper 4g in accordance with the detection information is driven and controlled, the toner in the toner hopper is supplied to the two-component developer 4e in the developing container 4a. 二成分現像剤4eに補給されたトナーは攪拌部材4fにより攪拌される。 Toner supplied to the two-component developer 4e is agitated by the stirring member 4f.

【0057】e)転写手段・定着手段 5は転写装置であり、本例は転写ローラである。 [0057] e) a transfer means, fixing means 5 transfer apparatus, the present embodiment is a transfer roller. この転写ローラ5は感光ドラム1に所定の押圧力をもって圧接させてあり、その圧接ニップ部が転写部dである。 The transfer roller 5 is Yes by pressing with a predetermined pressing force to the photosensitive drum 1, the press nip is a transcription unit d. この転写部dに不図示の給紙機構部から所定の制御タイミングにて転写材(被転写部材、記録材)Pが給送される。 Transfer material (transfer member, a recording material) from a paper feed mechanism section (not shown) to the transfer portion d at a predetermined control timing P is fed.

【0058】転写部dに給送された転写材Pは回転する感光ドラム1と転写ローラ5の間に挟持されて搬送され、その間、転写ローラ5に電源S3からトナーの正規帯電極性である負極性とは逆極性である正極性の転写バイアス本例では+2kVが印加されることで、転写部d [0058] The fed transfer material P to the transfer portion d is conveyed is sandwiched between the photosensitive drum 1 and the transfer roller 5 which rotates, during which the negative electrode is a normal charging polarity of the toner from a power source S3 is the transfer roller 5 the sex that the positive transfer bias this example of which is the opposite polarity + 2 kV is applied, the transfer portion d
を挟持搬送されていく転写材Pの面に感光ドラム1面側のトナー画像が順次に静電転写されていく。 Toner image held and conveyed by the surface of the transfer material P goes photosensitive drum 1 surface side is successively electrostatically transferred.

【0059】転写部dを通ってトナー画像の転写を受けた転写材Pは回転感光ドラム1面から順次に分離されて定着装置6(例えば熱ローラ定着装置)へ搬送されてトナー画像の定着処理を受けて画像形成物(プリント、コピー)として出力される。 [0059] The transfer material P having received the toner image through the transfer portion d fixing processing of the conveyed toner image to the fixing device are sequentially separated from the rotating photosensitive drum 1 surface 6 (e.g. a heat roller fixing device) receiving and outputted as an image-formed product (print, copy).

【0060】(2)クリーナレスシステムおよびトナー帯電量制御 本例のプリンタはクリーナレスであり、転写材Pに対するトナー画像転写後の感光ドラム1面に若干量残留する転写残トナーを除去する専用のクリーニング装置は具備させていない。 [0060] (2) cleanerless system and the toner charge amount controlling this example of the printer is cleanerless, dedicated removing residual toner small amount remaining on the photosensitive drum 1 surface after the toner image transfer onto the transfer material P the cleaning device is not allowed to provided. 転写後の感光ドラム1面上の転写残トナーは引き続く感光ドラム1の回転に伴い帯電部a、露光部bを通って現像部cに持ち運ばれて、現像装置3により現像同時クリーニング(回収)される(クリーナレスシステム)。 Charging station a with the rotation of the transfer residual toner on the photosensitive drum 1 surface after transfer subsequent photosensitive drum 1, it is carried to the developing portion c through the exposure portion b, cleaning simultaneous with developing by the developing device 3 (recovery) It is (cleaner-less system).

【0061】本実施例においては現像装置4の現像スリーブ4bは前述したように現像部cにおいて、感光ドラム1面の進行方向とは逆方法に回転させており、これは感光ドラム1上の転写版トナーの回収に有利である。 [0061] developing sleeve 4b of the developing device 4 in this embodiment is at the developing portion c, as described above, and is rotated in the opposite way to the traveling direction of the photosensitive drum 1 surface, which is transferred on the photosensitive drum 1 it is advantageous to the recovery of the printing toner.

【0062】感光ドラム1面上の転写残トナーは露光部bを通るので露光工程はその転写残トナー上からなされるが、転写残トナーの量は少ないため、大きな影響は現れない。 [0062] While the residual toner on the photosensitive drum 1 surface exposure process so through the exposure portion b is made from its transfer residual toner, the amount of residual toner because small, large effect will not appear.

【0063】ただ前述のように、転写残トナーには帯電極性が正規極性のもの、逆極性のもの(反転トナー)、 [0063] Just as described above, the transfer residual toner that the charge polarity of the normal polarity, that of the reverse polarity (reversal toner),
帯電量が少ないものが混在しており、その内の反転トナーや帯電量が少ないトナーが帯電部aを通過する際に帯電ローラ2に付着することで帯電ローラが許容以上にトナー汚染して帯電不良を生じることになる。 What amount of charge less are mixed, inverted toner and the charge amount is small toner of which the charging roller by toner contamination to acceptable or by adhering to the charging roller 2 when it passes through the charging station a charging It will produce a failure.

【0064】また、感光ドラム1面上の転写残トナーの現像装置3による現像同時クリーニングを効果的に行なわせるためには、現像部cに持ち運ばれる感光ドラム上の転写残トナーの帯電極性が正規極性であり、かつその帯電量が現像装置によって感光ドラムの静電潜像を現像できるトナーの帯電量であることが必要である。 [0064] In order to perform a cleaning simultaneous with developing by the developing device 3 of the transfer residual toner on the photosensitive drum 1 surface effectively, the charge polarity of the transfer residual toner on the photosensitive drum to be carried to the developing portion c a normal polarity, and it is necessary that the charge amount of toner that can develop the electrostatic latent image on the photosensitive drum by the charging amount developing device. 反転トナーや帯電量が適切でないトナーについては感光ドラム上から現像装置に除去・回収できず、不良画像の原因となってしまう。 For inverted toner and the charge amount is not appropriate toner can not be removed and collected into the developing device from the photosensitive drum, thus causing the image defect.

【0065】また、近年のユーザニーズの多様化に伴い、写真画像などといった高印字率な画像などの連続の印字動作などにより、一度に大量の転写残トナーの発生により、上述のような問題を更に助長させてしまうのである。 [0065] Furthermore, with the diversification of recent users' needs, such as by continuous printing operation, such as a high printing ratio images, such as photographic images, the generation of a large amount of transfer residual toner at a time, the above-mentioned problems it from being brought further promoted.

【0066】そこで本実施例においては、転写部dよりも感光ドラム回転方向下流側の位置において、感光ドラム1上の転写残トナーを均一化するための、転写残トナー(残留現像剤像)均一化手段8を設け、この転写残トナー均一化手段8よりも感光ドラム回転方向下流側で、 [0066] Therefore, in the present embodiment, at the position of the photosensitive drum rotation direction downstream of the transfer portion d, in order to equalize the transfer residual toner on the photosensitive drum 1, the transfer residual toner (residual developer image) uniform the means 8 is provided, in the photosensitive drum rotation direction downstream of the transfer residual toner uniformizing means 8,
帯電部aよりも感光ドラム回転方向上流側の位置において、転写残トナーの帯電極性を正規極性である負極性に揃えるためのトナー(現像剤)帯電量制御手段7を設けている。 In the position of the photosensitive drum rotation direction upstream side of the charging portion a, is provided with a toner (developer) charge amount controlling means 7 for aligning the negative polarity in the charging polarity of the transfer residual toner at normal polarity.

【0067】転写残トナー均一化手段8を設けることにより、転写部dからトナー帯電量制御手段7へ持ち運ばれる感光ドラム1上のパターン状の転写残トナーはトナー量が多くても、そのトナーが感光ドラム1面に分散分布化され、非パターン化されるので、トナー帯電量制御手段7の一部にトナーが集中することがなくなり、該トナー帯電量制御手段7による転写残トナーの全体的な正規極性帯電化処理が常に十分になされて、転写残トナーの帯電ローラ2への付着防止が効果的になされる。 [0067] By providing the transfer residual toner uniformizing means 8, patterned transfer residual toner on the photosensitive drum 1 to be carried from the transfer station d to the toner charge amount controlling means 7 be much toner amount, the toner There are dispersed distributed into one side photosensitive drum, because it is non-patterned, prevents the toner in a part of the toner charge amount controlling means 7 is concentrated, the overall transfer residual toner by the toner charge amount controlling means 7 been made to such normal polarity zone imparting process is always sufficient, preventing adhesion to the charging roller 2 of the transfer residual toner is effectively accomplished. 転写残トナー像パターンのゴースト像の発生も厳に防止される。 Ghost image of the transfer residual toner image pattern is prevented strictly.

【0068】ここで、本発明におけるトナーの摩擦帯電量は、例えば以下のようにして測定することができる(ブローオフ法)。 [0068] Here, the triboelectric charge quantity of the toner in the present invention can be measured, for example, as follows (blow-off method). 図6に摩擦帯電量測定装置の一例の模式斜視図を示す。 Figure 6 shows an example schematic perspective view of a triboelectric charge quantity measuring device. 図を参照して、底に導電性スクリーン83のある金属製の測定容器82に摩擦帯電量を測定しようとする現像剤(トナーのみ、またはトナーとキャリアの混合物)を入れ、金属製のフタ84をする。 Referring to the figure, bottom conductive screen 83 of a certain metal measuring container 82 developer to be measured frictional charge amount (toner only or a mixture of toner and carrier) were placed, metal lid 84 do. このときの測定容器82全体の重量を秤り、これをW1 Weighed the weight of the entire measuring container 82 at this time, which W1
(g)とする。 And (g).

【0069】次に、吸引機81(少なくとも測定容器8 Next, a suction device 81 (at least the measurement container 8
2と接する部分は絶縁体からなる)を用いて、吸引口8 2 in contact with portions with an insulator), suction port 8
7から吸引し、風量調節弁86を調節して真空計85に示される圧力を2450Paとする。 Aspirated from 7 to 2450Pa pressure indicated in gauge 85 by adjusting the air-flow control valve 86. この状態で充分(約1分間)吸引を行ない、トナーを吸引除去する。 It performs well (about 1 minute) the suction in this state to suck and remove the toner. このときの電位計89の電位を直読し、V(ボルト)とする。 The potential indicated by a potentiometer 89 at this time is direct reading, and V (volts). 88はコンデンサーであり、この容量をC(μF) 88 is a condenser, the capacity C (μF)
とする。 To. また、吸引後の測定容器82全体の重量を秤り、W2(g)とする。 Moreover, the weight of the entire measurement container 82 after the suction is weighed, and W2 (g). この場合、現像剤中のトナーの摩擦帯電量T(μC/g)は下式の如く計算される。 In this case, the frictional charge amount of the toner in the developer T (μC / g) is calculated as shown by the following equation.

【0070】 T(μC/g)=C×V/(W1−W2) 現像時のトナー帯電量の測定は、そのトナーを感光ドラム1面上から採集して測定容器82に入れてなされる。 [0070] Measurement of T (μC / g) = C × V / (W1-W2) toner charge amount at the time of development is done putting the measuring vessel 82 to collect the toner from the surface of the photosensitive drum 1 on.

【0071】トナー帯電量制御手段7を通過した後の転写残トナーの帯電量の測定は、そのトナーを感光ドラム1面上から採集して測定容器82に入れてなされる。 [0071] Measurement of charge quantity of the transfer residual toner after passing through the toner charge amount controlling means 7 is made to put the measuring vessel 82 to collect the toner from the surface of the photosensitive drum 1 on.

【0072】帯電部aを通過した後の転写残トナーの帯電量の測定は、そのトナーを感光ドラム1面上から採集して測定容器82に入れてなされる。 [0072] Measurement of charge quantity of the transfer residual toner after passing through the charging portion a is made to put the measuring vessel 82 to collect the toner from the surface of the photosensitive drum 1 on.

【0073】本実施例では、上記の転写残トナー均一化手段8とトナー帯電量制御手段7は、適度の導電性を持ったブラシ状部材であり、ブラシ部を感光ドラム1面に接触させて配設してある。 [0073] In this embodiment, the above-mentioned transfer residual toner uniformizing means 8 and the toner charge amount controlling means 7 is a brush-like member having a moderate conductivity, by contacting the brush portion on the photosensitive drum 1 surface It is disposed. fは転写残トナー均一化手段8と感光ドラム1面の接触部である。 f is the contact portion of the photosensitive drum 1 surface and the transfer residual toner uniformizing means 8. eはトナー帯電量制御手段7と感光ドラム1面の接触部である。 e is the contact portion between the photosensitive drum 1 surface toner charge amount controlling means 7.

【0074】転写残トナー均一化手段8はアース接地されており、トナー帯電量制御手段7には負極性の電圧が電源S4より印加されている。 [0074] transfer residual toner uniformizing means 8 is grounded, the toner charge amount controlling means 7 is a negative voltage is applied from a power source S4.

【0075】転写部dにおける転写材Pに対するトナー画像転写後の感光ドラム1上に残留の転写残トナーは引き続く感光ドラム1の回転で転写残トナー均一化手段8 [0075] transfer unit rotating at the residual toner uniformizing means of the transfer residual toner subsequent photosensitive drum 1 remaining on the photosensitive drum 1 after the toner image transfer onto the transfer material P in d 8
と感光ドラム1との接触部fに至り、一旦転写残トナー均一化手段8に吸引する。 It reaches the contact portion f of the photosensitive drum 1 and, once attracted to the transfer residual toner uniformizing means 8. ここで、転写残トナー均一化手段8が抱え得るトナー量には限界があるため、飽和状態に達した後は徐々にトナーが離脱して感光ドラム1面に付着して搬送されるが、感光ドラム1面におけるトナーの付着状態、すなわち感光ドラム1面に付着するトナーの分布は均一化されるのである。 Here, the transfer since the remaining toner uniformizing means 8 is the amount of toner may suffer is limited, but gradually toner after reaching the saturation state is conveyed to adhere to the surface of the photosensitive drum 1 disengaged, photosensitive toner adhesion state of the drum 1 surface, namely the toner adhering to the photosensitive drum 1 surface distribution is being equalized.

【0076】転写残トナー均一化手段8で均一化された感光ドラム面上の転写残トナーは引き続く感光ドラム1 [0076] transfer residual toner on the uniform photosensitive drum surface in the transfer residual toner uniformizing means 8 followed photosensitive drum 1
の回転でトナー帯電量制御手段7と感光ドラム1との接触部eに至り、このトナー帯電量制御手段7を通過する感光ドラム1上の転写残トナーはその帯電極性が正規極性である負極性に揃えられる。 Negative leads in the rotating contact portion e of the toner charge amount controlling means 7 and the photosensitive drum 1, the transfer residual toner on the photosensitive drum 1 through the toner charge amount controlling means 7 to the charge polarity is in normal polarity It is aligned to.

【0077】転写残トナーの帯電極性を正規極性である負極性に揃えることにより、さらに下流に位置する帯電部aで、該転写残トナーの上から感光ドラム1面上を帯電処理する際に、感光ドラム1への鏡映力が大きくし、 [0077] By aligning the negative polarity in the charging polarity of the transfer residual toner in normal polarity, the charging portion a located further downstream, when charged photosensitive drum 1 Menjo from the top of said transfer Utsushizan toner, reflection force to the photosensitive drum 1 is increased,
転写残トナーの帯電ローラ2への付着を防止するのである。 Than to prevent adhesion to the charging roller 2 of the transfer residual toner.

【0078】この為に転写残トナーに必要な帯電量は現像時のトナー帯電量と比較すると、2.2倍以上必要である。 [0078] When the charge amount necessary for the transfer residual toner in this order is compared with the toner charge amount at the time of development, there is a need to 2.2 times.

【0079】ここで、トナー帯電量制御手段7への印加電圧と、トナー帯電制御手段7を通過後のトナー帯電量の関係を図3に示す。 [0079] Here, it shows the voltage applied to the toner charge amount controlling means 7, after passing through the toner charge controlling means 7 the relationship of the toner charge amount in FIG. トナー帯電量制御手段7に電圧を印加させていないときは、上述したように、転写残トナーには画像部の負極性トナー、非画像部の正極性トナー、転写の正極性の電圧に影響され極性が正極性に反転してしまったトナーが含まれるため、帯電量は不定である。 When not voltage is applied to the toner charge amount controlling means 7, as described above, the negative polarity toner image portion on the transfer residual toner, a positive polarity toner in the non-image area is affected by the positive voltage of the transfer because it contains toner whose polarity is accidentally inverted to the positive polarity, the charge amount is indefinite. また、トナー帯電量制御手段7に電圧を印加させていくことにより、トナー帯電量制御手段7を通過後のトナー帯電量を増加していき、ある値以上において飽和していることがわかる。 Further, by going to apply a voltage to the toner charge amount controlling means 7, continue to increase the toner charge amount after passing through the toner charge amount controlling means 7, it can be seen that the saturation in a certain value or more. 本実施例において使用したトナーにおいて、飽和したときの帯電量は−90μC/gであった。 In the toner used in this embodiment, the charge amount when the saturation was -90μC / g.

【0080】次に帯電部aに転写残トナーが進入前の、 [0080] Then the transfer residual toner to the charging portion a is before entry,
転写残トナー量を1としたときの、転写残トナー帯電量と帯電ローラ2への付着量の関係を表したグラフを図4 Diagram when the transfer residual toner amount is 1, the graphs showing the adhesion amount related to the transfer residual toner charge amount and the charging roller 2 4
に示す。 To show. 転写残トナーの帯電量を大きくすることによって、付着量が低下していることがわかる。 By increasing the charge amount of the transfer residual toner, it can be seen that the amount of deposition is reduced. また、このときの転写残トナーの帯電ローラ2への付着による帯電不良画像の発生は、−55μC/g以下の転写残トナーの帯電量の時に発生した。 Further, the occurrence of charge failure image by adhering to the charging roller 2 of the transfer residual toner in this case, occurred when the charge amount of the following residual toner -55μC / g.

【0081】よって、転写残トナーの帯電ローラ2への付着を防止し、帯電不良画像の発生を抑制するためには、転写残トナーの帯電量を、現像時のトナー帯電量と比較すると、2.2倍以上必要であることがわかる。 [0081] Therefore, to prevent adhesion to the charging roller 2 of the transfer residual toner, in order to suppress the occurrence of improper charging image charge amount of the residual toner, when compared to the toner charge amount at the time of development, 2 it can be seen that there is a need .2 times or more.

【0082】本実施例のおいては、トナー帯電制御手段7への印加電圧は−800Vとし、トナー帯電量手段7 [0082] Oite of this embodiment, the voltage applied to the toner charge controlling means 7 and -800 V, the toner charge amount means 7
を通過後の転写残トナーの帯電量は、−70μC/gとした。 The charge quantity of the transfer residual toner after passing, was -70μC / g.

【0083】次に現像工程における転写残トナーの回収について述べる。 [0083] Next described recovery of the transfer residual toner in the developing step.

【0084】現像装置4は上述したとおりで、現像と同時に転写残トナーを清掃するクリーナレス方式である。 [0084] The developing device 4 was as described above, is a cleaner-less method for cleaning the same time the transfer residual toner and the developing.
感光ドラム1上の現像されたトナー帯電量は前述したように、本実施例においては一25μC/gである。 Developed toner charge amount on the photosensitive drum 1, as described above, an 25μC / g in the present embodiment. ここで、本実施例における現像条件において、転写残トナーが現像装置4に回収されるための帯電量との関係を表1 Here, the developing condition in the present embodiment, the relationship between the charge amount for the transfer residual toner is collected into the developing device 4 Table 1
に示す。 To show.

【0085】 [0085]

【表1】 [Table 1]

【0086】感光ドラム1上の転写残トナーが現像装置4に回収されるためのトナー帯電量は、現像時のトナー帯電量(−25μC/g)と比較すると0.5〜1.8 [0086] Toner charge amount for the transfer residual toner is collected into the developing device 4 on the photosensitive drum 1 is different from the toner charge amount at the time of development (-25μC / g) 0.5~1.8
倍であることが必要である。 It is necessary that is twice.

【0087】しかしながら、上述したように帯電ローラ2へのトナー付着を防止するために、トナー帯電量制御手段7によって−70μC/gと負極性に大きく帯電された転写残トナーを、現像装置4において回収させるためには、除電を行う必要がある。 [0087] However, in order to prevent the toner adhesion to the charging roller 2 as described above, the transfer residual toner is greatly charged to -70μC / g and a negative polarity by the toner charge amount controlling means 7, the developing device 4 to recover, it is necessary to perform neutralization.

【0088】ここで帯電量が−70μC/gの感光ドラム1上のトナーが、帯電ローラ2を通過した後のトナー帯電量と、帯電ローラ2への印加交流電圧のVppとの関係を図5に示す。 [0088] and where the toner on the photosensitive drum 1 of the charge amount -70μC / g is, the toner charge amount after passing through the charging roller 2, the relationship between the Vpp of the applied AC voltage to the charging roller 2 5 to show. 交流電圧のVppを大きくするにつれ、受電されていることがわかる。 As increasing the Vpp of the AC voltage, it can be seen that the power receiving.

【0089】帯電ローラ2には感光ドラム1の周面を帯電処理するために、交流電圧(周波数f1000Hz、 [0089] For the charging roller 2 for charging processing the peripheral surface of the photosensitive drum 1, an AC voltage (frequency F1000Hz,
Vpp1400V)が印加されていることにより、転写残トナーは交流除電されるのである。 By Vpp1400V) is applied, the residual toner is being AC discharger. よって、帯電部a Therefore, the charging portion a
を通過後のトナー帯電量は−30μC/gとなる。 The toner charge amount after passing becomes -30 .mu.C / g. 現像工程においては、トナーが現像されるべきではない感光ドラム1上の転写残トナーは、上記の理由で現像装置4 In the developing step, transfer residual toner on the photosensitive drum 1, the toner should not be developed, the developing device in the above reasons 4
に回収される。 It is collected in.

【0090】かくして、転写部dから帯電部aへ持ち運ばれる感光ドラム1上の転写残トナーのトリボをトナー帯電量制御手段7で正規極性である負極性に揃えて帯電処理することで転写残トナーの帯電ローラ2への付着を防止しつつ、帯電ローラ2で感光ドラム1を所定の電位に帯電すると同時に、上記のトナー帯電量制御手段7で正規極性である負極性に帯電処理された転写残トナーの帯電量を、現像装置4によって感光ドラムの静電潜像を現像できる適切な帯電量に制御することで現像装置での転写残トナーの回収も効率的になされるもので、これにより、帯電不良や不良画像がなく、しかもクリーナレスシステムのメリットを生かした画像形成装置を提供できる。 [0090] Thus, the transfer residual by charged aligned to the negative polarity, which is the normal polarity of the triboelectric charge of the transfer residual toner on the photosensitive drum 1 to be carried to the charging station a toner charge amount controlling means 7 from the transfer portion d while preventing the adhesion to the charging roller 2 of the toner, and at the same time charging the photosensitive drum 1 to a predetermined potential by the charging roller 2, which is charged to the negative polarity, which is the normal polarity by the toner charge amount controlling means 7 of the transfer the charge amount of the residual toner, the recovery of residual toner in the developing device by controlling the appropriate amount of charge which can develop the electrostatic latent image on the photosensitive drum by the developing device 4 also intended to be made efficiently, thereby , charge failure and image failure without, yet can provide an image forming apparatus that utilizes the benefits of cleaner-less system.

【0091】〈実施例2〉本実施例の画像形成装置(プリンタ)の構成は実施例1と同様である。 [0091] Configuration <Example 2> The image forming apparatus of this embodiment (the printer) is the same as in Example 1.

【0092】現像剤(トナー)の帯電量は環境や現像剤の物性などにより変化する。 [0092] charge amount of the developer (toner) varies with the physical properties of the environment or the developer. 本実施例は低湿環境下などにおいて、現像後の感光ドラム1上のトナー帯電量が− This embodiment such as in a low-humidity environment, the toner charge amount on the photosensitive drum 1 after development -
35μC/gと、実施例1での−25μC/gに比べ大きい場合について述べる。 And 35μC / g, described is larger than the -25 / g in Example 1.

【0093】トナー帯電量制御手段7を通過後の転写残トナーのトナー帯電量は−90μC/gである。 [0093] The toner charge amount of the transfer residual toner having passed through the toner charge amount controlling means 7 is -90μC / g. よって、帯電部aにおいて帯電ローラ2への転写残トナーの付着も発生せず、帯電不良の発生も無かつた。 Therefore, adhesion of the transfer residual toner to the charging roller 2 in the charging station a does not occur, the faulty charging even no Katsuta occur.

【0094】また、帯電部aを通過後の転写残トナーの帯電量は−40μC/gであり、現像装置4への回収も良好になされた。 [0094] The charging amount of the transfer residual toner having passed through the charging portion a is -40μC / g, were made to better recovery of the developing device 4.

【0095】〈実施例3〉本実施例の画像形成装置(プリンタ)の構成は実施例1と同様である。 [0095] <Example 3> structure of the image forming apparatus of this embodiment (the printer) is the same as in Example 1.

【0096】転写残トナー均一化手段8には、直流電圧が印加されていてもよい。 [0096] The transfer residual toner uniformizing means 8, a DC voltage may be applied. 転写残トナーは一旦転写残トナー均一化手段によって吸引する。 Residual toner once sucked by the transfer residual toner uniformizing means. この場合においても上記実施例と同様、転写残トナー均一化手段8が抱え得るトナー量に限界があるため、飽和状態に達した後は徐々にトナーが離脱して感光ドラム1面に付着して搬送されるが、感光ドラム1面におけるトナーの付着状態、すなわち感光ドラム1面に付着するトナーの分布は均一化されるのである。 Similar to this is also the embodiment in a case example, since there is a limit to the amount of toner is transferred residual toner uniformizing means 8 may suffer, attached to the surface of the photosensitive drum 1 gradually separated toner after reaching saturation is conveyed, the toner adhesion state on the photosensitive drum 1 surface, namely the toner adhering to the photosensitive drum 1 surface distribution is being equalized.

【0097】本実施例においては−300Vの直流電圧を転写残トナー均一化手段8に印加した。 [0097] In the present embodiment, by applying a DC voltage of -300V to the transfer residual toner uniformizing means 8.

【0098】〈その他〉 1)転写残トナー均一化手段8とトナー帯電量制御手段7は、実施例では固定のブラシ状部材であるが、ブラシ回転体、弾性ローラ体、シート状部材など任意の形態の部材にすることができる。 [0098] <Others> 1) transfer residual toner uniformizing means 8 and the toner charge amount controlling means 7 is in the embodiment is a brush-like member fixed, the brush rotating member, an elastic roller member, the sheet-like member any such it can be members in the form.

【0099】2)像担持体は表面抵抗が10 9 〜10 14 [0099] 2) image bearing member surface resistance 10 9 10 14
Ω・cmの電荷注入層を設けた直接注入帯電性のものであってもよい。 The charge injection layer of Omega · cm may be of direct injection charging property provided. 電荷注入層を用いていない場合でも、例えば電荷輸送層が上記の抵抗範囲にある場合も同等の効果がえられる。 If you do not use a charge injection layer, the same effect will be obtained even if for example the charge transport layer is in the resistance range. 表層の体積抵抗が約10 13 Ω・cmであるアモルファスシリコン感光体でもよい。 A surface layer having a volume resistivity may be an amorphous silicon photosensitive member is about 10 13 Ω · cm.

【0100】3)可撓性の接触帯電部材は帯電ローラの他に、ファーブラシ、フェルト、布などの形状・材質のものも使用可能である。 [0100] 3) a flexible contact charging member, in addition to the charging roller can also be used a shape and material, such as a fur brush, felt, cloth. また各種材質のものの組み合わせでより適切な弾性、導電性、表面性、耐久性のものを得ることもできる。 The better elasticity in combination with any of various materials, conductivity, surface properties, can be obtained as durability.

【0101】4)接触帯電部材や現像部材に印加する振動電界の交番電圧成分(AC成分、周期的に電圧値が変化する電圧)の波形としては、正弦波、矩形波、三角波等適宜使用可能である。 [0102] 4) The contact charging member and the alternating voltage component (AC component of the oscillating electric field to be applied to the developing member, as periodically waveform voltage) whose voltage value changes, the sine wave, square wave, triangular wave or the like can be appropriately used it is. 直流電源を周期的にオン/オフすることによって形成された矩形波であってもよい。 The DC power supply may be a rectangular wave formed by periodically turning on / off.

【0102】5)像担持体としての感光体の帯電面に対する情報書き込み手段としての像露光手段は実施例のレーザ走査手段以外にも、例えば、LEDのような固体発光素子アレイを用いたデジタル露光手段であってもよい。 [0102] 5) The image exposing means as information writing means for the charged surface of the photosensitive member as the image bearing member in addition to the laser scanning means of embodiments, for example, a digital exposure using a solid-state light-emitting element array, such as a LED it may be a means. ハロゲンランプや蛍光灯等を原稿照明光源とするアナログ的な画像露光手段であってもよい。 A halogen lamp or a fluorescent lamp or the like may be analog image exposing means for a document illumination light source. 要するに、画像情報に対応した静電潜像を形成できるものであればよい。 In short, as long as it can form an electrostatic latent image corresponding to the image information.

【0103】6)像担持体は静電記録誘電体などであってもよい。 [0103] 6) image bearing member may be an electrostatic recording dielectric member. この場合は該誘電体面を一様に帯電した後、 After uniformly charging the dielectric body surface in this case,
その帯電面を除電針ヘッドや電子銃等の除電手段で選択的に除電して目的の画像情報に対応した静電潜像を書き込み形成する。 As the charged surface is selectively discharged by the charge eliminating needle head or an electron gun, etc. discharging means for forming write an electrostatic latent image corresponding to the image information of the object.

【0104】7)静電潜像のトナー現像方式・手段は任意である。 [0104] 7) The toner developing method or means of the electrostatic latent image is arbitrary. 反転現像方式でも正規現像方式でもよい。 Or a regular developing method in reversal development system.

【0105】一般的に、静電潜像の現像方法は、非磁性トナーについてはこれをブレード等でスリーブ等の現像剤担持搬送部材上にコーティングし、磁性トナーについてはこれを現像剤担持搬送部材上に磁気力によってコーティングして搬送して像担持体に対して非接触状態で適用し静電潜像を現像する方法(1成分非接触現像)と、 [0105] In general, developing method of the electrostatic latent image, which was coated on the developer carrying conveying member on the sleeve such a blade or the like for non-magnetic toner, a developer carrying conveying member this for magnetic toner a method (one component non-contact development) for developing an applied electrostatic latent image in a non-contact state with the image bearing member and conveyed by coating by a magnetic force above,
上記のように現像剤担持搬送部材上にコーティングしたトナーを像担持体に対して接触状態で適用し静電潜像を現像する方法(1成分接触現像)と、トナー粒子に対して磁性のキャリアを混合したものを現像剤(2成分現像剤)として用いて磁気力によって搬送して像担持体に対して接触状態で適用し静電潜像を現像する方法(2成分接触現像)と、上記の2成分現像剤を像担持体に対して非接触状態で適用し静電潜像を現像する方法(2成分非接触現像)との4種顛に大別される。 A method of developing the applied electrostatic latent image in contact the toner coated on the developer carrying conveying member on as described above with respect to the image bearing member (1-component contact development), the magnetic with respect to the toner particles carrier and a method (two-component contact development) for developing an applied electrostatic latent image in a contact state with respect to the image bearing member is transported by the magnetic force by using as a developer a mixture of (2-component developer), the is roughly divided into four 顛 the method of developing the applied electrostatic latent image in a non-contact state (two component non-contact development) a two-component developer to the image bearing member.

【0106】8)転写手段は実施形態例のローラ転写に限られず、ブレード転写、ベルト転写、その他の接触転写帯電方式であってもよいし、コロナ帯電器を使用した非接触転写帯電方式でもよい。 [0106] 8) transferring means is not limited to the roller transfer exemplary embodiment, a blade transfer, belt transfer, it may be other contact transfer charging method, or a non-contact transfer charging method using a corona charger .

【0107】9)転写ドラムや転写ベルトなどの中間転写体を用いて、単色画像形成ばかりでなく、多重転写等により多色、フルカラー画像を形成する画像形成装置にも本発明は適用できる。 [0107] 9) using an intermediate transfer member such as a transfer drum or a transfer belt, not only monochromatic image formation, but the present invention to an image forming apparatus that forms multicolor, a full-color image by multiple transfer, etc. can be applied.

【0108】 [0108]

【発明の効果】以上説明したように本発明によれば、転写工程後の像担持体上の転写残現像剤を現像同時クリーニングで除去・回収し再用するクリーナレス方式の画像形成装置について、帯電手段への転写残現像剤の付着を防止するとともに、現像手段での転写残現像剤の回収も効率的になされるようにすることで、帯電不良や不良画像がなく、しかもクリーナレスシステムのメリットを生かした画像形成装置を提供することができる。 According to the present invention as described in the foregoing, the image forming apparatus of a cleaner-less method to use again to remove and recover the transfer residual developer on the image bearing member after the transfer step in cleaning simultaneous with developing, thereby preventing the adhesion of the transfer residual developer to the charging means, also the recovery of the transfer residual developer in the developing means by to be made efficiently, charging failure or defect image without, moreover cleanerless system it is possible to provide an image forming apparatus utilizing the advantage.

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

【図1】 実施例の画像形成装置の概略構成模型図 1 is a schematic configuration model view of an image forming apparatus in embodiment

【図2】 感光ドラムと帯電ローラの層構成模型図 [Figure 2] layer configuration model view of the photosensitive drum and the charging roller

【図3】 トナー帯電量制御手段に対する印加電圧と転写残トナーの帯電量の関係図 [Figure 3] relationship diagram of the charge amount of the applied voltage and the transfer residual toner to the toner charge amount controlling means

【図4】 転写残トナーの帯電量と帯電ローラに対するトナー付着量の関係図 [4] Toner adhesion amount of relationship diagram for the charge amount of the residual toner and the charging roller

【図5】 帯電ローラを通過した後のトナー帯電量と印加交流電圧のVppとの関係図 [5] relationship diagram between Vpp of toner charge amount and the applied AC voltage after passing through the charging roller

【図6】 摩擦帯電量測定装置を示す模式斜視図 Figure 6 is a schematic perspective view showing a triboelectric charge quantity measuring device

【符号の説明】 DESCRIPTION OF SYMBOLS

1・・感光ドラム(像担持体)、2・・帯電ローラ、3 1 .. photosensitive drum (image bearing member), 2 ... charging roller, 3
・・レーザビームスキャナ、4・・現像装置、5・・転写ローラ、6・・定着装置、7・・トナー帯電量制御手段(現像剤帯電量制御手段)、8・・転写残トナー均一化手段(残留現像剤像均一化手段)、S1〜S4・・バイアス電圧印加電源 · The laser beam scanner, 4 ... developing device, 5 ... transfer roller, 6 ... fixing device, 7 ... toner charge amount controlling means (developer charge amount controlling means), 8 ... transfer residual toner uniformizing means (remaining developer image equalizing means), S1 to S4 · · bias voltage source

───────────────────────────────────────────────────── フロントページの続き (72)発明者 足立 元紀 東京都大田区下丸子3丁目30番2号 キヤ ノン株式会社内 Fターム(参考) 2H003 AA12 BB13 CC05 CC06 DD03 2H077 AA37 AC16 AE08 ────────────────────────────────────────────────── ─── front page of the continuation (72) inventor Motonori Adachi Ota-ku, Tokyo Shimomaruko 3-chome No. 30 No. 2 Canon Co., Ltd. in the F-term (reference) 2H003 AA12 BB13 CC05 CC06 DD03 2H077 AA37 AC16 AE08

Claims (15)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】像担持体と、 像担持体面を帯電する帯電手段と、 帯電処理された像担持体に静電潜像を形成する情報書き込み手段と、 静電潜像に現像剤を供給し静電潜像を可視化する現像手段と、 可視化した現像剤像を転写材に転写する転写手段と、 前記帯電手段より上流に位置していて、像担持体面上の現像剤を帯電する現像剤帯電量制御手段と、 前記現像剤帯電量制御手段より上流かつ前記転写手段より下流に位置していて、前記現像剤像を転写材に転写した後の像担持体面上に残留する残留現像剤像を均一化する残留現像剤像均一化手段と、 を有し、現像剤像転写後の像担持体上に残留する残留現像剤像を前記残留現像剤像均一化手段で均一化し、その均一化された像担持体上の残留現像剤を前記現像剤帯電量制御手段で正規極性に And 1. A image bearing member, supplies a charging unit that charges the image bearing member surface, and information writing means for forming an electrostatic latent image on an image bearing member which has been charged, the developer to the electrostatic latent image a developing unit for visualizing an electrostatic latent image, a transfer unit that transfers a transfer material a developer image visualized and located upstream of said charging means, developer charging for charging the developer on the image bearing member surface and amount control means, said located downstream from the upstream and the transfer means from the developer charge amount controlling means, the residual developer image remaining the developer image on the image bearing member surface after the transfer to the transfer material It has a residual developer image uniformizing means for uniformizing, and then homogenizing the residual developer image remaining on the image bearing member after the developer image is transferred by the remaining developer image uniformizing means is the uniform and the residual developer on the image bearing member to the normal polarity by the developer charge amount controlling means 帯電処理し、前記帯電手段で前記像担持体面を帯電すると同時に、適正帯電量にすることを特徴とした画像形成装置。 Charged and, at the same time as charging the image bearing member surface by the charging unit, an image forming apparatus, characterized in that a proper charge quantity.
  2. 【請求項2】前記帯電手段は接触帯電方式であることを特徴とする請求項1の画像形成装置。 Wherein said charging means is an image forming apparatus according to claim 1, characterized in that the contact charging system.
  3. 【請求項3】前記帯電手段に振動電界を印加することを特徴とする請求項1または2の画像形成装置。 3. A process according to claim 1 or 2 of the image forming apparatus and applying the oscillating electric field in the charging unit.
  4. 【請求項4】前記情報書き込み手段は露光手段であることを特徴とする請求項1ないし3のいずれかの画像形成装置。 Wherein said information writing means any of the image forming apparatus 3 to claims 1, characterized in that the exposure means.
  5. 【請求項5】前記残留現像剤像均一化手段が前記像担持体に対して電位差を有する電極部から構成されていることを特徴とする請求項1ないし4のいずれかの画像形成装置。 Wherein said residual developer image uniformizing means is any of the image forming apparatus 4 claims 1, characterized in that it is constituted from the electrode portion having a potential difference with respect to the image carrier.
  6. 【請求項6】像担持体と、 像担持体面を帯電する帯電手段と、 帯電処理された像担持体に静電潜像を形成する情報書き込み手段と、 静電潜像に現像剤を供給し静電潜像を可視化する現像手段と、 可視化した現像剤像を転写材に転写する転写手段と、 前記帯電手段より上流に位置していて、像担持体面上の現像剤を帯電する現像剤帯電量制御手段と、 前記現像剤帯電量制御手段より上流かつ前記転写手段より下流に位置していて、前記現像剤像を転写材に転写した後の像担持体面上に残留する残留現像剤像を均一化する残留現像剤像均一化手段と、 を有し、現像剤像転写後の像担持体上に残留する残留現像剤像を前記残留現像剤像均一化手段で均一化し、その均一化された像担持体上の残留現像剤を前記現像剤帯電量制御手段で正規極性に 6. A image bearing member, supplies a charging unit that charges the image bearing member surface, and information writing means for forming an electrostatic latent image on an image bearing member which has been charged, the developer to the electrostatic latent image a developing unit for visualizing an electrostatic latent image, a transfer unit that transfers a transfer material a developer image visualized and located upstream of said charging means, developer charging for charging the developer on the image bearing member surface and amount control means, said located downstream from the upstream and the transfer means from the developer charge amount controlling means, the residual developer image remaining the developer image on the image bearing member surface after the transfer to the transfer material It has a residual developer image uniformizing means for uniformizing, and then homogenizing the residual developer image remaining on the image bearing member after the developer image is transferred by the remaining developer image uniformizing means is the uniform and the residual developer on the image bearing member to the normal polarity by the developer charge amount controlling means 帯電処理し、前記帯電手段で前記像担持体面を帯電すると同時に、前記現像剤帯電量制御手段で帯電処理された時の帯電量の絶対値よりも小さい絶対値の帯電量にすることを特徴とした画像形成装置。 Charging processes, and wherein the charging means and at the same time charging the image bearing member surface, to the charge amount of the smaller absolute value than the absolute value of the charge amount when the is charged by the developer charging amount controlling means an image forming apparatus.
  7. 【請求項7】前記帯電手段は接触帯電方式であることを特徴とする請求項6の画像形成装置。 7. The image forming apparatus according to claim 6 wherein the charging unit, which is a contact charging system.
  8. 【請求項8】前記帯電手段に振動電界を印加することを特徴とする請求項6または7の画像形成装置。 8. The image forming apparatus according to claim 6 or 7, characterized in applying an oscillating electric field to said charging means.
  9. 【請求項9】前記情報書き込み手段は露光手段であることを特徴とする請求項6ないし8のいずれかの画像形成装置。 Wherein said information writing means any of the image forming apparatus 6 to claim, characterized in that the exposure means 8.
  10. 【請求項10】前記残留現像剤像均一化手段が前記像担持体に対して電位差を有する電極部から構成されていることを特徴とする請求項6ないし9のいずれかの画像形成装置。 10. The image forming apparatus to the residual developer image equalizing means 6 claims, characterized by being composed from the electrode portion having a potential difference with respect to the image carrier 9.
  11. 【請求項11】像担持体と、 像担持体面を帯電する帯電手段と、 帯電処理された像担持体に静電潜像を形成する情報書き込み手段と、 静電潜像に現像剤を供給し静電潜像を可視化する現像手段と、 可視化した現像剤像を転写材に転写する転写手段と、 前記帯電手段より上流に位置していて、像担持体面上の現像剤を帯電する現像剤帯電量制御手段と、 前記現像剤帯電量制御手段より上流かつ前記転写手段より下流に位置していて、前記現像剤像を転写材に転写した後の担持体面上に残留する残留現像剤像を均一化する残留現像剤像均一化手段と、 を有し、現像剤像転写後の像担持体上に残留する残留現像剤像を前記残留現像剤像均一化手段で均一化し、その均一化された像担持体上の残留現像剤を前記現像剤帯電量制御手段で前記現像手 11. A image bearing member, supplies a charging unit that charges the image bearing member surface, and information writing means for forming an electrostatic latent image on an image bearing member which has been charged, the developer to the electrostatic latent image a developing unit for visualizing an electrostatic latent image, a transfer unit that transfers a transfer material a developer image visualized and located upstream of said charging means, developer charging for charging the developer on the image bearing member surface and amount control means, said located downstream from the upstream and the transfer means from the developer charge amount controlling means, uniform residual developer image remaining the developer image on the bearing member surface after the transfer to the transfer material anda residual developer image uniformizing means for reduction, the residual developer image remaining on the image bearing member after the developer image has been transferred and homogenized in the remaining developer image uniformizing means, is the uniform the developing hands residual developer on the image carrier in the developer charge amount controlling means 段後の現像剤帯電量の2.2倍以上の帯電量でかつ正規極性に帯電処理し、前記帯電手段で前記像担持体面を帯電すると同時に、前記現像手段後の現像剤帯電量の0.5〜1.8倍の帯電量にすることを特徴とした画像形成装置。 At the same time and a 2.2-fold or more charge amount of the developer charge amount after stage it was charged to a normal polarity, to charge the image bearing member surface by the charging unit, 0 of the developer charge amount after the developing unit. image forming apparatus, characterized in that the 5 to 1.8 times the amount of charge.
  12. 【請求項12】前記帯電手段は接触帯電方式であることを特徴とする請求項11の画像形成装置。 12. An image forming apparatus according to claim 11 wherein the charging means is characterized in that it is a contact charging system.
  13. 【請求項13】前記帯電手段に振動電界を印加することを特徴とする請求項11または12の画像形成装置。 13. The image forming apparatus according to claim 11 or 12, characterized in applying an oscillating electric field to said charging means.
  14. 【請求項14】前記情報書き込み手段は露光手段であることを特徴とする請求項11ないし13のいずれかの画像形成装置。 14. The image forming apparatus of claims 11 to 13, characterized in that said information writing means is exposure means.
  15. 【請求項15】前記残留現像剤像均一化手段が前記像担持体に対して電位差を有する電極部から構成されていることを特徴とする請求項11ないし14のいずれかの画像形成装置。 15. The image forming apparatus to the residual developer image uniformizing means no claim 11, characterized in that it is constituted from the electrode portion having a potential difference with respect to the image carrier 14.
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DE2000634208 DE60034208T2 (en) 1999-12-28 2000-12-28 Image forming apparatus
DE2000634208 DE60034208D1 (en) 1999-12-28 2000-12-28 Image forming apparatus
US09749540 US6421512B2 (en) 1999-12-28 2000-12-28 Image forming apparatus with image bearing member charger that reduces the amount of toner electric charge
EP20000128648 EP1113343B1 (en) 1999-12-28 2000-12-28 Image forming apparatus
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US6879793B2 (en) 2002-06-19 2005-04-12 Canon Kabushiki Kaisha Method for forming image
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US7286788B2 (en) 2002-09-24 2007-10-23 Canon Kabushiki Kaisha Image forming apparatus
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US7657197B2 (en) 2006-12-05 2010-02-02 Canon Kabushiki Kaisha Image forming apparatus employing a cleaner-less system
US7773913B2 (en) 2006-09-13 2010-08-10 Canon Kabushiki Kaisha Image forming apparatus
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US6611668B2 (en) * 2001-09-04 2003-08-26 Canon Kabushiki Kaisha Image forming apparatus with residual developing charging feature
JP2003076215A (en) * 2001-09-04 2003-03-14 Canon Inc Image forming apparatus
US6807384B2 (en) 2002-04-19 2004-10-19 Canon Kabushiki Kaisha Image forming apparatus
US6879793B2 (en) 2002-06-19 2005-04-12 Canon Kabushiki Kaisha Method for forming image
US7286788B2 (en) 2002-09-24 2007-10-23 Canon Kabushiki Kaisha Image forming apparatus
US7756446B2 (en) 2004-12-14 2010-07-13 Canon Kabushiki Kaisha Image forming apparatus
US7383004B2 (en) 2004-12-14 2008-06-03 Canon Kabushiki Kaisha Image forming apparatus
JP2006337750A (en) * 2005-06-02 2006-12-14 Canon Inc Electrophotographic apparatus
JP4612868B2 (en) * 2005-06-02 2011-01-12 キヤノン株式会社 Electrophotographic apparatus
US7831176B2 (en) 2006-06-09 2010-11-09 Canon Kabushiki Kaisha Image forming apparatus with residual toner transfer feature
US7899363B2 (en) 2006-06-09 2011-03-01 Canon Kabushiki Kaisha Image forming apparatus
US7773913B2 (en) 2006-09-13 2010-08-10 Canon Kabushiki Kaisha Image forming apparatus
JP2008139355A (en) * 2006-11-29 2008-06-19 Canon Inc Image forming apparatus
US8027617B2 (en) 2006-11-29 2011-09-27 Canon Kabushiki Kaisha Image forming apparatus
US7805089B2 (en) 2006-12-05 2010-09-28 Canon Kabushiki Kaisha Image forming apparatus
US7657197B2 (en) 2006-12-05 2010-02-02 Canon Kabushiki Kaisha Image forming apparatus employing a cleaner-less system
US7831159B2 (en) 2006-12-06 2010-11-09 Canon Kabushiki Kaisha Image forming apparatus for forming toner image using developer made of toner and carrier
JP2008145522A (en) * 2006-12-06 2008-06-26 Canon Inc Image forming apparatus
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US7945190B2 (en) 2006-12-21 2011-05-17 Canon Kabushiki Kaisha Cleanerless image forming apparatus
JP2009192941A (en) * 2008-02-15 2009-08-27 Canon Inc Image forming apparatus
US9164417B2 (en) 2012-05-14 2015-10-20 Canon Kabushiki Kaisha Image forming apparatus with developer bearing member velocity control

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