JP4086736B2 - Developing device and image forming apparatus - Google Patents

Developing device and image forming apparatus Download PDF

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JP4086736B2
JP4086736B2 JP2003307593A JP2003307593A JP4086736B2 JP 4086736 B2 JP4086736 B2 JP 4086736B2 JP 2003307593 A JP2003307593 A JP 2003307593A JP 2003307593 A JP2003307593 A JP 2003307593A JP 4086736 B2 JP4086736 B2 JP 4086736B2
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developer
developing
control member
image
toner
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JP2005077702A (en
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武志 川村
健 中川
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Canon Inc
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Priority to KR1020040044765A priority patent/KR100657447B1/en
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Description

本発明は電子写真方式を利用した画像形成装置において、像担持体表面に形成した静電潜像を現像して可視化するために用いられる現像装置に係り、特に、像担持体と現像剤担持体との間に所定の間隔を設け、交流電界により非接触で現像を行う現像装置及び画像形成装置に関する。   The present invention relates to a developing device used for developing and visualizing an electrostatic latent image formed on the surface of an image carrier in an image forming apparatus using an electrophotographic system, and more particularly to an image carrier and a developer carrier. In particular, the present invention relates to a developing device and an image forming apparatus that perform a non-contact development by an AC electric field with a predetermined interval therebetween.

従来、レーザビームプリンタや、複写機等の画像形成装置としては、図19に示したような電子写真法を用いた画像形成装置が提案されている。これらの基本動作について以下に説明する。   Conventionally, as an image forming apparatus such as a laser beam printer or a copying machine, an image forming apparatus using an electrophotographic method as shown in FIG. 19 has been proposed. These basic operations will be described below.

画像形成工程において、像担持体としての通常ドラム状つまり回転体とされる電子写真感光体(以下「感光ドラム」と称す。)11は、先ず、帯電工程にて一次帯電器12にて一様に帯電される。次に、潜像形成工程である露光工程にて外部装置より入力された画像情報に対応して露光装置13より感光ドラム11表面に光照射を行い、潜像を形成する。次に、現像工程にて、この感光ドラム11表面の静電潜像は、現像装置60において、一次帯電器12の印加電圧と同極性の摩擦帯電極性を有する現像剤(以下「トナー」と称す。)Tにより可視像即ち現像剤像(トナー像)とされる。このトナー像は、転写工程にて、転写帯電器14にて転写材Qに転写される。転写材Qは感光ドラム11より分離され、続いて、定着工程にて、定着装置16に搬送されて、それによる定着後に永久像となる。又、転写帯電器14で転写されずに残った感光ドラム11表面の現像剤Tは、クリーニング装置15にて除去され、感光ドラム11は次の画像形成工程(画像形成プロセス)に供される。   In an image forming process, an electrophotographic photosensitive member (hereinafter referred to as a “photosensitive drum”) 11 that is a normal drum-like, ie, rotating body, as an image carrier is first uniformly formed by a primary charger 12 in a charging process. Is charged. Next, the surface of the photosensitive drum 11 is irradiated with light from the exposure device 13 in accordance with the image information input from the external device in the exposure step, which is a latent image forming step, to form a latent image. Next, in the developing process, the electrostatic latent image on the surface of the photosensitive drum 11 is developed in the developing device 60 with a developer (hereinafter referred to as “toner”) having a triboelectric charge polarity that is the same as the voltage applied to the primary charger 12. .) A visible image, that is, a developer image (toner image) is formed by T. This toner image is transferred to the transfer material Q by the transfer charger 14 in the transfer process. The transfer material Q is separated from the photosensitive drum 11 and subsequently conveyed to the fixing device 16 in a fixing process, and becomes a permanent image after fixing by the fixing device 16. Further, the developer T on the surface of the photosensitive drum 11 remaining without being transferred by the transfer charger 14 is removed by the cleaning device 15, and the photosensitive drum 11 is subjected to the next image forming process (image forming process).

上記の画像形成装置にて実施される画像形成工程において、主に現像工程を行う現像装置60について説明する。   The developing device 60 that mainly performs the developing step in the image forming process performed by the image forming apparatus will be described.

現像装置60に収容され、現像剤として使用されるトナーTは負帯電性であり且つイエロー・マゼンタ・シアン・ブラック各色いずれかの顔料を含有した負帯電性非磁性一成分トナーである。   The toner T contained in the developing device 60 and used as a developer is a negatively chargeable non-magnetic one-component toner that is negatively charged and contains a pigment of any one of yellow, magenta, cyan, and black.

このトナーTは、現像装置本体カバーとしての現像容器60aに収容され、現像容器60内に設置された攪拌部材64、65にて攪拌されて均一に維持される。攪拌部材64については、各種形状に加工された板状もしくはスクリュー等から構成されるトナー第1撹拌部材64及びトナー第2撹拌部材65が感光ドラム11軸方向に平行に設けられており、図中矢印の方向に回転してしており、トナー収納部(現像容器)60a中のトナーTを、現像剤担持体としての回転体である現像ローラ61へ搬送している。撹拌部材は2本と限定されず、各種現像器構成にあわせて、現像容器60a内部から現像ローラ61近傍までトナーを搬送することが出来れば撹拌部材の個数は問わない。   The toner T is accommodated in a developing container 60a serving as a developing device main body cover, and is agitated by stirring members 64 and 65 installed in the developing container 60 to be kept uniform. As for the stirring member 64, a toner first stirring member 64 and a toner second stirring member 65 which are formed of plates or screws processed into various shapes are provided in parallel to the axial direction of the photosensitive drum 11, and in the drawing. Rotating in the direction of the arrow, the toner T in the toner container (developing container) 60a is conveyed to the developing roller 61 which is a rotating member as a developer carrying member. The number of the agitating members is not limited to two, and the number of agitating members is not limited as long as the toner can be conveyed from the inside of the developing container 60a to the vicinity of the developing roller 61 according to various developing device configurations.

現像容器60aは、現像ローラ61と、2本の攪拌部材のうち現像ローラ61側に設置された攪拌部材64との間に、現像容器仕切り板66を有し、つまり、現像容器60aは、現像ローラ61にトナーTを供給する現像部60bと、トナーTを収容して攪拌する攪拌部60cとに仕切られている。そして、現像ローラ61のある現像部において、常に一定量のトナーTを現像ローラ61近傍の現像剤供給剥ぎ取りローラ62表面に供給すべく仕切り板66の高さは適正化されている。   The developing container 60a has a developing container partition plate 66 between the developing roller 61 and the stirring member 64 installed on the developing roller 61 side of the two stirring members. That is, the developing container 60a has a developing container 60a. The developing unit 60b for supplying the toner T to the roller 61 and the stirring unit 60c for storing and stirring the toner T are partitioned. The height of the partition plate 66 is optimized so that a constant amount of toner T is always supplied to the surface of the developer supply and stripping roller 62 in the vicinity of the developing roller 61 in the developing portion where the developing roller 61 is provided.

非磁性一成分現像法においては、磁力によるトナー供給が不可能となるため、上記のように、現像部60bにおいては、現像ローラ61にはウレタンスポンジ製の現像剤供給剥ぎ取りローラ62が当接されている。現像剤供給剥ぎ取りローラ62は、現像ローラ61とのニップ部でカウンタ方向に回転することで、トナーTを現像ローラ61表面に供給すると同時に、感光ドラム11対向位置を通過しても現像されなかった現像ローラ61表面のトナーを剥ぎ取っている。   In the non-magnetic one-component development method, toner cannot be supplied by magnetic force. Therefore, in the developing unit 60b, the developer supply stripping roller 62 made of urethane sponge contacts the developing roller 61 as described above. Has been. The developer supply stripping roller 62 rotates in the counter direction at the nip portion with the developing roller 61 so that the toner T is supplied to the surface of the developing roller 61 and at the same time is not developed even when passing through the position facing the photosensitive drum 11. The toner on the surface of the developing roller 61 is removed.

現像ローラ61には、現像剤量規制部材として規制ブレード63が当接されており、現像ローラ61表面のトナーを規制して、トナー薄層を形成し、現像領域(ドラム対向位置)70に搬送されるトナー量を規定している。現像領域70に搬送されるトナー量は、現像ローラ61表面に接触する規制ブレード63の当接圧や当接長さ等により決定される。   The developing roller 61 is in contact with a regulating blade 63 as a developer amount regulating member, regulates toner on the surface of the developing roller 61, forms a thin toner layer, and conveys it to the developing area (drum facing position) 70. This defines the amount of toner to be used. The amount of toner conveyed to the development area 70 is determined by the contact pressure and contact length of the regulating blade 63 that contacts the surface of the development roller 61.

規制ブレード63は、厚さ数百μmのリン青銅・ステンレス等の金属薄板表面に接着もしくは溶着されており、この金属薄板の弾性によって規制ブレード63は均一に現像ローラ61に当接されているチップブレードである。このとき金属薄板の材質、厚さ、侵入量、設定角によって規制ブレード63の当接条件が決定される。   The regulating blade 63 is adhered or welded to the surface of a thin metal plate made of phosphor bronze, stainless steel or the like having a thickness of several hundreds of μm, and the regulation blade 63 is uniformly abutted against the developing roller 61 by the elasticity of the metallic thin plate. It is a blade. At this time, the contact condition of the regulating blade 63 is determined by the material, thickness, penetration amount, and set angle of the thin metal plate.

又、上記現像ローラ61は、現像領域70で、感光ドラム11表面と所定の間隔(以下「SDギャップ」と称す。)をおいて対向し、バイアスが印加されることで振動電界である交流電界を形成している。   The developing roller 61 is opposed to the surface of the photosensitive drum 11 with a predetermined distance (hereinafter referred to as “SD gap”) in the developing region 70, and an AC electric field that is an oscillating electric field when a bias is applied. Is forming.

上記の構成において所望の帯電量と所望の層厚で現像ローラ61表面に付着して現像領域70に搬送されてきてトナーTは、上記交流電界によって、現像ローラ61表面に付着したトナーTが、現像ローラ61と感光ドラム11との間で往復運動を行い、感光ドラム11表面に形成された静電潜像を可視化する。   In the above configuration, the toner T adhered to the surface of the developing roller 61 with a desired charge amount and a desired layer thickness and conveyed to the developing region 70 is transferred to the surface of the developing roller 61 by the AC electric field. A reciprocating motion is performed between the developing roller 61 and the photosensitive drum 11 to visualize the electrostatic latent image formed on the surface of the photosensitive drum 11.

しかしながら、このように、交流電界によって現像を行う現像装置60において、「はき寄せ」と呼ばれる画像不良が発生する。   However, in this way, in the developing device 60 that performs development using an alternating electric field, an image defect called “pumping” occurs.

以下に図20を用いて、「はき寄せ現象」について説明する。図20は、感光ドラム11と現像ローラ61との対向部70を回転方向に対して側面から観測したモデル図である。   Hereinafter, the “rushing phenomenon” will be described with reference to FIG. FIG. 20 is a model diagram in which the facing portion 70 between the photosensitive drum 11 and the developing roller 61 is observed from the side with respect to the rotation direction.

はき寄せとは、現像領域70において、現像ローラ61回転方向上流部分である画像後端部Hにトナーが多く集まる現象である。   The close-up is a phenomenon in which a large amount of toner collects in the image rear end H that is the upstream portion of the developing roller 61 in the rotation direction in the developing region 70.

このようなトナー像が形成されると、画像に濃度が濃くなった部分が見られる画像欠陥を引き起こしてしまうのである。   When such a toner image is formed, an image defect in which a dark portion is seen in the image is caused.

図20のように感光ドラム11と現像ローラ61の間に交流バイアス(ACバイアス)を印加すると、樽型の電界Dが生じる。すると、現像ローラ61表面に付着しているトナーT1は電界Dによって形成される電気力線Dに沿って、感光ドラム11と現像ローラ61の間を往復運動する。そして、感光ドラム11と現像ローラ61の最近接点Sよりも外側に向かって移動する。つまり、ACバイアスを印加すると、現像領域70内のトナーT1は常に現像領域70外方向に移動する速度成分を持つようになる。こうした電気力線Dによる外側への押し出しと感光ドラム11の回転方向に従って、特に現像領域70より現像ローラ61回転方向上流側Hに、トナーT1が溜まるのである。   When an AC bias (AC bias) is applied between the photosensitive drum 11 and the developing roller 61 as shown in FIG. 20, a barrel-shaped electric field D is generated. Then, the toner T1 adhering to the surface of the developing roller 61 reciprocates between the photosensitive drum 11 and the developing roller 61 along the electric force line D formed by the electric field D. Then, the photosensitive drum 11 and the developing roller 61 move outward from the closest point S. That is, when an AC bias is applied, the toner T1 in the development area 70 always has a velocity component that moves outward from the development area 70. The toner T1 accumulates on the upstream side H of the developing roller 61 in the rotation direction of the developing roller 61 in accordance with the outward pushing by the electric force line D and the rotating direction of the photosensitive drum 11.

ここで、感光ドラム11と現像ローラ61が図中矢印方向に回転し、潜像が作られている場合、つまり、実際の現像中の場合について説明する。図20において、感光ドラム11帯電電位Vdが−100Vの部分Aが潜像部分であり、トナー像が形成される領域である。Vdが‐500Vの部分Bは、一次帯電器12による感光ドラム11の基準電位であり、トナー像が形成されない領域である。潜像部分Aが現像領域70内に達したとき、現像ローラ61表面のトナーは潜像部分Aに付着していくが、上記したように飛翔トナーT1には現像領域70外方向に移動する速度成分があるため、潜像部分Aの現像ローラ61回転方向上流側へと移動する。   Here, a case where the photosensitive drum 11 and the developing roller 61 are rotated in the direction of the arrow in the drawing to form a latent image, that is, a case where actual development is being performed will be described. In FIG. 20, a portion A where the photosensitive drum 11 charging potential Vd is −100 V is a latent image portion, and is a region where a toner image is formed. A portion B where Vd is −500 V is a reference potential of the photosensitive drum 11 by the primary charger 12 and is a region where a toner image is not formed. When the latent image portion A reaches the developing region 70, the toner on the surface of the developing roller 61 adheres to the latent image portion A. However, as described above, the flying toner T1 moves to the outside of the developing region 70. Since there is a component, the latent image portion A moves to the upstream side in the rotation direction of the developing roller 61.

又、Vd=−100Vの部分AとVd=−500Vの部分Bの境目においては、−500Vから−100Vに向かう電界が生じている。それにより、潜像部分Aの現像ローラ61回転方向上流側へと移動してきた負極性のトナーT1は、この境目で滞留してしまう。そのため、潜像部分A及び中央部Sの現像ローラ61回転方向上流のトナー量が多くなってしまい、この部分にはき寄せHが形成される。   An electric field from −500 V to −100 V is generated at the boundary between the portion A where Vd = −100 V and the portion B where Vd = −500 V. As a result, the negative toner T1 that has moved to the upstream side in the rotation direction of the developing roller 61 of the latent image portion A stays at this boundary. For this reason, the amount of toner upstream of the latent image portion A and the central portion S in the rotation direction of the developing roller 61 increases, and a close-up H is formed in these portions.

はき寄せHによるトナーの滞留部つまり掃き寄せ画像を低減させる方法として、特許文献1にて現像領域70に電極を有する板状部材を挿入し、はき寄せを低減するという提案がなされている。しかしながら、画像形成動作を繰り返し行い、現像装置60の寿命近くの状態においては、画像の端部、つまり紙の両端からはき寄せ画像やトナー飛散が発生してしまう。
特開平8−22185号公報
As a method for reducing the toner staying portion, that is, the swept image due to the rushing H, a proposal has been made in Patent Document 1 to insert a plate-like member having an electrode in the development region 70 to reduce the lashing. . However, when the image forming operation is repeatedly performed and the developing device 60 is near the end of its life, an image and toner scattering are generated from the edge of the image, that is, from both ends of the paper.
JP-A-8-22185

本発明の目的は、交流電界によって、現像剤担持体から像担持体に現像剤を移動させて現像動作を行う現像装置において、簡易な構成にて、長期にわたって、現像剤担持体と像担持体との対向部である現像領域にて発生する掃き寄せ、飛散トナーの付着を抑え、良好な画像を形成する現像装置及び画像形成装置を提供することである。   SUMMARY OF THE INVENTION An object of the present invention is to provide a developer carrying body and an image carrier over a long period of time with a simple configuration in a developing device that performs a developing operation by moving the developer from the developer carrier to the image carrier by an alternating electric field. It is an object to provide a developing device and an image forming apparatus that suppress the sweeping and scattering toner adhering to occur in a developing area that is a portion opposite to the surface, and form a good image.

上記目的は本発明に係る現像装置及び画像形成装置にて達成される。要約すれば、第1の本発明は、現像剤を収容する現像容器と、前記現像剤を担持搬送する回転体である現像剤担持体と、を有し、静電潜像が形成され、該静電潜像を担持する回転体である像担持体に前記現像剤担持体を対向させ、該対向部に位置する現像領域にて、振動電界を形成し該振動電界により、前記現像剤担持体表面にて担持して前記現像領域に搬送された前記現像剤で、前記静電潜像を現像する現像装置において、
前記現像剤担持体の軸方向に平行な方向における前記像担持体の画像保証領域において、前記像担持体の回転方向上流から前記現像領域内に先端部が侵入した板状部材であり、前記現像剤担持体の軸方向に平行な方向の幅が、同方向における前記画像保証領域よりも広い飛翔現像剤制御部材を有し、前記飛翔現像剤制御部材の長手方向の端部における前記飛翔現像剤制御部材の先端部は、前記画像保証領域における前記飛翔現像剤制御部材の先端部よりも、前記像担持体の回転方向下流に突出して設けられることを特徴とする現像装置を提供する。
The above object is achieved by the developing device and the image forming apparatus according to the present invention. In summary, the first aspect of the present invention includes a developer container that contains a developer, and a developer carrier that is a rotating body that carries and transports the developer, and an electrostatic latent image is formed thereon. The developer carrier is opposed to an image carrier, which is a rotating body that bears an electrostatic latent image, and an oscillating electric field is formed in a developing region located at the facing portion, and the developer carrier is borne by the oscillating electric field. It carries at the surface by the developer conveyed to the developing area, the developing device for developing the electrostatic latent image,
In the image guarantee area of the image carrier in a direction parallel to the axial direction of the developer carrier, a plate-like member having a tip portion entering the development area from the upstream in the rotation direction of the image carrier, the development member agent parallel width in the axial direction of the bearing member, have a broader flight developer control member than before Kiga image assurance area in the same direction, the flight in the longitudinal direction of the end portion of the flying developer control member The developing device is characterized in that a leading end portion of the developer control member is provided so as to protrude downstream from the leading end portion of the flying developer control member in the image guarantee area in the rotation direction of the image carrier .

第1の本発明の一実施態様によると、前記飛翔現像剤制御部材は、前記現像剤担持体の回転方向の上流側から、前記現像領域に一端辺を配置させて侵入しており、前記飛翔現像剤制御部材の侵入開始部が、前記現像剤担持体の逆回転方向の角度で、前記現像剤担持体と前記像担持体との回転中心を結ぶ位置を0°として、30°の方向に前記現像剤担持体の半径を延長させた延長部と交差する位置より、前記飛翔現像剤制御部材に沿った方向で、前記現像領域に存在する前記飛翔現像剤制御部材の端辺からの距離が長い位置にある。   According to an embodiment of the first aspect of the present invention, the flying developer control member enters from the upstream side in the rotation direction of the developer carrying member with one end arranged in the developing region, and the flying developer control member The intrusion start portion of the developer control member is an angle in the reverse rotation direction of the developer carrier, and the position connecting the rotation centers of the developer carrier and the image carrier is 0 °, and the direction is 30 °. The distance from the edge of the flying developer control member existing in the development region in a direction along the flying developer control member from a position intersecting with the extension portion extending the radius of the developer carrier. In a long position.

第1の本発明の他の実施態様によると、前記飛翔現像剤制御部材の長手方向の端部は、前記現像領域の前記現像剤担持体回転方向の全領域と対向しているか、又は、前記飛翔現像剤制御部材の長手方向の端部が前記現像剤担持体に向かって屈折した形状を有するか、又は、前記飛翔現像剤制御部材の長手方向の端部が前記像担持体と前記現像剤担持体との間隔を一定に保つ部材に接触又は近接しているのが好ましい。 According to a first alternative embodiment of the present invention, the longitudinal end portion of the flying developer control member, the or opposed to the entire region of the developer carrying member rotation direction of the developing region, or the A longitudinal end portion of the flying developer control member has a shape refracted toward the developer carrier, or a longitudinal end portion of the flying developer control member is the image carrier and the developer. It is preferable to be in contact with or close to a member that keeps the distance from the carrier constant.

第2の本発明は、表面に静電潜像が形成される像担持体と、前記静電潜像を現像する第1の本発明の現像装置を有することを特徴とする画像形成装置を提供する。   According to a second aspect of the present invention, there is provided an image forming apparatus comprising: an image carrier on which an electrostatic latent image is formed on a surface; and the developing device according to the first aspect of the present invention that develops the electrostatic latent image. To do.

本発明の現像装置及び画像形成装置は、静電潜像が形成され、静電潜像を担持する回転体である像担持体に現像剤担持体を対向させ、対向部に位置する現像領域にて、振動電界を形成し振動電界により、現像剤担持体表面にて担持して現像領域に搬送された現像剤で、静電潜像を現像する現像装置において、現像剤担持体の軸方向に平行な方向における像担持体の画像保証領域において、像担持体の回転方向上流から現像領域内に先端部が侵入した板状部材であり、現像剤担持体の軸方向に平行な方向の幅が、同方向における画像保証領域よりも広い飛翔現像剤制御部材を有し、飛翔現像剤制御部材の長手方向の端部における飛翔現像剤制御部材の先端部は、画像保証領域における飛翔現像剤制御部材の先端部よりも、像担持体の回転方向下流に突出して設けられるので、現像装置寿命まで、現像領域にて生じる現像剤の掃き寄せ、端部からの現像剤飛散を防止し、安定した画像を出力する。 In the developing device and the image forming apparatus of the present invention , an electrostatic latent image is formed, and a developer carrying member is opposed to an image carrier that is a rotating member that carries the electrostatic latent image, and a developing region located in a facing portion is provided. Te, the oscillating electric field to form an oscillating electric field, in the developer conveyed by supporting a developing region at the surface of the developer carrying member in the developing device for developing an electrostatic latent image, in the axial direction of the developer carrying member In the image guarantee area of the image carrier in the parallel direction, it is a plate-like member whose leading end has entered the development area from the upstream in the rotation direction of the image carrier , and has a width in a direction parallel to the axial direction of the developer carrier. , have a broader flight developer control member than images guarantee area that put in the same direction, the tip of the flight developer control member in the longitudinal direction of the end of the flight the developer control member, flying developing the image assurance area The rotation direction of the image carrier is lower than the tip of the agent control member Since is provided to protrude, to the developing device life, sweeping of the developer caused in the developing region, to prevent the developer scattering from the end portion, and outputs a stable image.

以下、本発明に係る現像装置及び画像形成装置を図面に則して更に詳しく説明する。   Hereinafter, the developing device and the image forming apparatus according to the present invention will be described in more detail with reference to the drawings.

実施例1
本実施例における現像装置を図1に示す。図1に示す現像装置100は、非磁性一成分非接触現像方式の現像器に本発明を適用したものである。以下現像装置100について詳細に説明する。
Example 1
A developing device in this embodiment is shown in FIG. A developing apparatus 100 shown in FIG. 1 is one in which the present invention is applied to a developing device of a non-magnetic one-component non-contact developing system. Hereinafter, the developing device 100 will be described in detail.

本実施例の現像装置100は、従来例にて説明した図19に示した構成の画像形成装置の現像装置60の位置に備えられ、従来例にて説明した画像形成工程の現像工程にて像担持体である感光ドラム1表面に形成された静電潜像を現像するものとする。図1において、現像装置100は、像担持体としての回転体である感光ドラム1に周面を対向させて平行に設けられており、現像剤を収容する現像容器100aと、現像剤担持体としての回転体である現像ローラ2と、現像剤供給部材としての現像剤供給剥ぎ取りローラ3と、トナー規制部材4と、板状部材である飛翔現像剤制御部材(制御部材)5と、板状のトナー攪拌部材6と、を備え、現像容器100aには絶縁性の非磁性一成分現像剤であるトナーTを収容している。   The developing device 100 of this embodiment is provided at the position of the developing device 60 of the image forming apparatus having the configuration shown in FIG. 19 described in the conventional example, and an image is formed in the developing process of the image forming process described in the conventional example. It is assumed that the electrostatic latent image formed on the surface of the photosensitive drum 1 which is a carrier is developed. In FIG. 1, a developing device 100 is provided in parallel with a peripheral surface facing a photosensitive drum 1 which is a rotating body as an image carrier, and a developer container 100a for containing a developer, and a developer carrier. A developer roller 2 as a rotating member, a developer supply stripping roller 3 as a developer supply member, a toner regulating member 4, a flying developer control member (control member) 5 as a plate member, and a plate-like member And a toner agitating member 6, and the developer container 100 a contains toner T, which is an insulating non-magnetic one-component developer.

現像装置100に対向する感光ドラム1としては、外径30mmのアルミニウム素管表面に、OPC等の感光材料を塗工して構成されている部材を用いた。   As the photosensitive drum 1 facing the developing device 100, a member constituted by coating a photosensitive material such as OPC on the surface of an aluminum base tube having an outer diameter of 30 mm was used.

そして、現像装置100が有する各部材について説明する。   Then, each member included in the developing device 100 will be described.

現像剤担持体としての現像ローラ2として、外径16mmのアルミニウム素管表面に、カーボン、グラファイトを分散したフェノール樹脂溶液をスプレー塗工した部材を用いた。現像ローラ2の軸方向両端部には、図3に示すように、コロ21を設置し、感光ドラム1表面に突き当てることで、感光ドラム1と現像ローラ2とに一定のSDギャップを保つ。ここでは、SDギャップを300μmと設定した。   As the developing roller 2 as a developer carrier, a member obtained by spray-coating a phenol resin solution in which carbon and graphite are dispersed on the surface of an aluminum base tube having an outer diameter of 16 mm was used. As shown in FIG. 3, rollers 21 are installed at both ends in the axial direction of the developing roller 2 and abut against the surface of the photosensitive drum 1 to maintain a constant SD gap between the photosensitive drum 1 and the developing roller 2. Here, the SD gap was set to 300 μm.

現像剤供給剥ぎ取りローラ3としては、外径5mmの金属芯金に厚さ4.5mmのウレタンフォームを外周に形成した部材を用いた。   As the developer supply peeling roller 3, a member in which a 4.5 mm thick urethane foam was formed on the outer periphery of a metal core having an outer diameter of 5 mm was used.

トナー規制部材4としては、厚さ0.1mmのリン青銅板を用いた。   As the toner regulating member 4, a phosphor bronze plate having a thickness of 0.1 mm was used.

ここで、現像装置100の動作について説明する。   Here, the operation of the developing device 100 will be described.

トナーTは負帯電性であり且つイエロー・マゼンタ・シアン・ブラック各色いずれかの顔料を含有した負帯電性非磁性一成分トナーである。   The toner T is a negatively chargeable non-magnetic one-component toner that is negatively charged and contains a pigment of any one of yellow, magenta, cyan, and black.

本実施例の現像装置100においては、感光ドラム1軸方向に攪拌部材6を1本設けた。その攪拌部材である、トナー撹拌部材6が、図中矢印の方向に回転できるように配置し、トナー収納部中のトナーTを現像ローラ2へ搬送している。本実施例でも、従来例と同様に、現像容器100aは、現像ローラ2が設置された現像部100bと攪拌部材6が設置された100cとに現像容器仕切り板7によって分割されており、常に一定量のトナーTを現像ローラ2近傍の現像剤供給剥ぎ取りローラ3表面に供給すべく仕切り板7の高さは適正化されている。   In the developing device 100 of this embodiment, one agitating member 6 is provided in the direction of one axis of the photosensitive drum. A toner stirring member 6, which is the stirring member, is arranged so as to be able to rotate in the direction of the arrow in the drawing, and the toner T in the toner storage portion is conveyed to the developing roller 2. Also in this embodiment, like the conventional example, the developing container 100a is divided by the developing container partition plate 7 into the developing unit 100b in which the developing roller 2 is installed and 100c in which the stirring member 6 is installed. The height of the partition plate 7 is optimized so that an amount of toner T is supplied to the surface of the developer supply stripping roller 3 near the developing roller 2.

現像剤供給剥ぎ取りローラ3は、現像ローラ2に当接されており、ニップ部でカウンタ方向に回転することでトナーTを現像ローラ2表面に供給すると同時に、感光ドラム1対向位置を通過しても現像されなかった現像ローラ2表面のトナーを剥ぎ取っている。   The developer supply stripping roller 3 is in contact with the developing roller 2 and rotates in the counter direction at the nip portion to supply the toner T to the surface of the developing roller 2 and at the same time pass through the position facing the photosensitive drum 1. Also, the toner on the surface of the developing roller 2 that was not developed is stripped off.

現像ローラ2は、現像容器100aから感光ドラム1周面に向けて、その周面の一部を露出させているが、その露出部分にて現像ローラ2回転方向上流側の現像容器100a開口部にて、現像ローラ2には、トナー量規制部材としての規制ブレード4が当接されており、現像ローラ2表面のトナーを規制してトナー薄層を形成し、現像領域70に搬送されるトナー量を規定すると同時に、トナーを帯電させている。   The developing roller 2 exposes a part of the peripheral surface from the developing container 100a toward the peripheral surface of the photosensitive drum 1, and the exposed portion is exposed to the opening of the developing container 100a upstream of the developing roller 2 in the rotation direction. The developing roller 2 is in contact with a regulating blade 4 as a toner amount regulating member, regulates the toner on the surface of the developing roller 2 to form a thin toner layer, and the amount of toner conveyed to the developing area 70 At the same time, the toner is charged.

上記の構成において所望の帯電量と所望の層厚で現像ローラ2表面に付着して、現像領域70に搬送されてきたトナーTは、現像ローラ2に印加される現像バイアスによって、現像ローラ2表面に付着したトナーTが、現像ローラ2と感光ドラム1との間で往復運動を行うことで感光ドラム1表面に形成された静電潜像を可視化する。   In the above configuration, the toner T that adheres to the surface of the developing roller 2 with a desired charge amount and a desired layer thickness and is conveyed to the developing region 70 is developed by the developing bias applied to the developing roller 2. The toner T adhering to the surface reciprocates between the developing roller 2 and the photosensitive drum 1 to visualize the electrostatic latent image formed on the surface of the photosensitive drum 1.

ここで、本実施例における現像装置100における各設定条件を説明する。   Here, each setting condition in the developing device 100 in the present embodiment will be described.

感光ドラム1は図中の矢印方向に回転し、現像ローラ2は図中の矢印方向に回転する。つまり本実施例では、感光ドラム1と現像ローラ2の回転方向は、対向部70において同方向つまり順方向である。これは、画像形成条件によっては、カウンタ方向とすることも可能である。   The photosensitive drum 1 rotates in the direction of the arrow in the figure, and the developing roller 2 rotates in the direction of the arrow in the figure. That is, in this embodiment, the rotation directions of the photosensitive drum 1 and the developing roller 2 are the same direction, that is, the forward direction, at the facing portion 70. This can be the counter direction depending on the image forming conditions.

そして、現像バイアスとして、交流振幅2kV、交流周波数3kHzの交流バイアスに−260Vの直流バイアスを重畳させた振動電圧を用いた。この振動電圧によって、現像ローラ2と感光ドラム1(感光ドラムの暗部電位及び明部電位)との間に交番電界(振動電界)が形成される。   As the developing bias, an oscillating voltage obtained by superimposing a DC bias of −260 V on an AC bias having an AC amplitude of 2 kV and an AC frequency of 3 kHz was used. By this oscillating voltage, an alternating electric field (oscillating electric field) is formed between the developing roller 2 and the photosensitive drum 1 (dark portion potential and light portion potential of the photosensitive drum).

又、現像ローラ2表層のトナーTを均一な薄層にするため、現像ローラ2にはトナー規制部材4が現像ローラ2の回転方向に対してカウンタ方向に30g/cmの線圧で現像ローラ2と当接している。   Further, in order to make the toner T on the surface layer of the developing roller 2 a uniform thin layer, the toner regulating member 4 is provided on the developing roller 2 at a linear pressure of 30 g / cm in the counter direction with respect to the rotating direction of the developing roller 2. Abut.

こうした現像装置100において、本実施例の特徴としては、現像領域70におけるトナー飛散、吐き出しを防止するために、現像領域70に板状部材である飛翔現像剤制御部材(制御部材)5を侵入させて設けたことである。実施例1の制御部材5について、図を用いて説明する。図2は、本実施例1の現像装置100における現像領域70付近の拡大図であり、現像ローラ2及び感光ドラム1の回転方向の側面から見た図である。   In such a developing device 100, the feature of this embodiment is that a flying developer control member (control member) 5 which is a plate-like member is inserted into the developing region 70 in order to prevent toner scattering and ejection in the developing region 70. It was established. The control member 5 of Example 1 is demonstrated using figures. FIG. 2 is an enlarged view of the vicinity of the developing region 70 in the developing device 100 according to the first embodiment, and is a diagram viewed from the side surface in the rotation direction of the developing roller 2 and the photosensitive drum 1.

飛翔現像剤制御部材5は、感光ドラム1と現像ローラ2との対向部である現像領域70において、現像ローラ2の回転方向上流側から、制御部材5の一端辺5aが現像領域70に存在するように侵入させて配置する。   The flying developer control member 5 has one end side 5 a of the control member 5 in the developing region 70 from the upstream side in the rotation direction of the developing roller 2 in the developing region 70, which is a facing portion between the photosensitive drum 1 and the developing roller 2. Arrange them so that they invade.

例えば、ここでは、制御部材5を、現像領域70略中心Sに制御部材5の一端辺5aが存在するように配置する。つまり、制御部材5は、現像領域70即ち感光ドラム1と現像装置2の対向部に現像ローラ2回転方向上流側から、その最先端である一端辺5aが現像領域70内にあるように侵入させた板状部材である。言い換えると、制御部材5は、片端5aを感光ドラム1と現像ローラ2との間に挟んで、現像ローラ2の回転方向上流側に突出した板状部材である。制御部材5の現像領域70に存在している一端辺5aと対称位置のもう片端辺5bは、本実施例では、図1のように現像装置100の現像容器100aに固定されている。しかし、一端部5aが現像領域70にあれば、固定部となるもう片端5bは、画像形成装置の現像装置100以外の部材に固定されていても良い。   For example, here, the control member 5 is arranged so that the one end side 5 a of the control member 5 exists at the approximate center S of the development region 70. In other words, the control member 5 enters the developing region 70, that is, the facing portion between the photosensitive drum 1 and the developing device 2 from the upstream side in the rotation direction of the developing roller 2 so that the one end side 5 a that is the foremost end is in the developing region 70. It is a plate-shaped member. In other words, the control member 5 is a plate-like member that protrudes upstream in the rotation direction of the developing roller 2 with the one end 5 a interposed between the photosensitive drum 1 and the developing roller 2. In this embodiment, the other end side 5b symmetrical to the one end side 5a existing in the developing region 70 of the control member 5 is fixed to the developing container 100a of the developing device 100 as shown in FIG. However, if the one end portion 5a is in the developing region 70, the other end 5b serving as a fixing portion may be fixed to a member other than the developing device 100 of the image forming apparatus.

図3は本実施例1の現像装置100における感光ドラム1側から見た制御部材5の配置構成図である。現像ローラ2の軸方向両端には、SDコロ21が設けられ、SDギャップ300μmの間隔を保っている。そして、現像ローラ2軸方向の制御部材5の存在領域(幅)は、現像ローラ2の軸方向に平行な方向において、画像が形成される画像保証領域よりも広く配置する。   FIG. 3 is an arrangement configuration diagram of the control member 5 viewed from the photosensitive drum 1 side in the developing device 100 of the first embodiment. SD rollers 21 are provided at both ends of the developing roller 2 in the axial direction, and an SD gap of 300 μm is maintained. The area (width) of the control member 5 in the axial direction of the developing roller 2 is arranged wider than the image guarantee area in which an image is formed in a direction parallel to the axial direction of the developing roller 2.

そして、制御部材5の現像領域70に存在する端辺5aと、現像ローラ2及び感光ドラム1との距離は、特に限定されないが、感光ドラム1と現像ローラ2の中間付近もしくは、制御部材5の一端辺5aの位置を保つために、感光ドラム1表面に押圧接触させることが好適である。   The distance between the edge 5a existing in the developing region 70 of the control member 5 and the developing roller 2 and the photosensitive drum 1 is not particularly limited. However, the distance between the photosensitive drum 1 and the developing roller 2 or near the control member 5 is not limited. In order to maintain the position of the one end side 5a, it is preferable to press and contact the surface of the photosensitive drum 1.

ここで、制御部材5が設置される現像領域70を定義するとともにその測定方法を示す。   Here, the developing region 70 where the control member 5 is installed is defined and a measuring method thereof is shown.

上記現像装置100において、現像ローラ2表面に帯電されたトナーTが付着している状態で、且つ感光ドラム1及び現像ローラ2を停止した状態で、現像ローラ2表面のトナーが充分飛翔可能なACバイアスを印加する。そのとき、感光ドラム1表面近傍の現像ローラ2表面において、トナーTが存在しないもしくは、周りよりもトナー層の少ない領域とその領域の両端でトナー層の厚い領域が発生する。   In the developing device 100, AC on which the toner on the surface of the developing roller 2 can sufficiently fly in a state where the charged toner T is attached to the surface of the developing roller 2 and the photosensitive drum 1 and the developing roller 2 are stopped. Apply a bias. At that time, on the surface of the developing roller 2 near the surface of the photosensitive drum 1, the toner T does not exist, or a region where the toner layer is less than the surroundings and a region where the toner layer is thick are generated at both ends of the region.

その様子をモデル化したものを図4に示す。図4において、感光ドラム1と現像ローラ2間にACバイアスを印加すると、感光ドラム1と現像ローラ2との間には図示したように湾曲電界が形成される。その湾曲電界に沿って対向部70中心S付近のトナーは図中矢印の方向つまり、対向部70中心Sの外側に向かって移動する。又、対向部70中心Sから遠ざかるほど、SDギャップが離れる為、ACバイアスの影響が小さくなり、トナーの動きも小さくなる。図中a及びdの外側においては、現像ローラ上のトナーは、ACバイアスの影響を受けない。その結果、a−b間、及びc−d間として示される、対向部70中心Sに対して両対称に存在する部分がトナー層Tの厚い領域となり、この厚い領域a−bとc−dの間である現像領域70中心部Sを含むb−c間が、トナーTの存在しない、もしくは、周りよりもトナー層Tの少ない領域となる。   A model of this situation is shown in FIG. In FIG. 4, when an AC bias is applied between the photosensitive drum 1 and the developing roller 2, a curved electric field is formed between the photosensitive drum 1 and the developing roller 2 as illustrated. The toner near the center 70 of the facing portion 70 moves along the curved electric field in the direction of the arrow in the drawing, that is, toward the outside of the center S of the facing portion 70. Further, as the distance from the center S of the facing portion 70 is increased, the SD gap is increased, so that the influence of the AC bias is reduced and the movement of the toner is also reduced. Outside of a and d in the figure, the toner on the developing roller is not affected by the AC bias. As a result, a portion that is shown symmetrically with respect to the opposite center 70 center S, which is shown as between ab and cd, becomes a thick region of the toner layer T. The thick regions ab and cd The area between bc including the central part S of the development area 70 between the areas where there is no toner T or the toner layer T is smaller than the surrounding area.

図4において、これらトナー層の厚い領域と少ない領域を合わせたa−d間を現像領域70とする。上記の制御部材5の先端5aが存在する現像領域70は、上記のa−d間の領域である。そして、現像領域70の幅は、感光ドラム1及び現像ローラ2の径、SDギャップ、温度、湿度、気圧等の環境、現像バイアス、現像バイアス印加時間、トナーTの帯電量及び現像ローラ2表面トナー付着量によって変化する。   In FIG. 4, a development area 70 is defined between a and d where the thick area and the small area of the toner layer are combined. The development area 70 where the tip 5a of the control member 5 is present is an area between the above-mentioned ad. The width of the development area 70 is the diameter of the photosensitive drum 1 and the development roller 2, the SD gap, the environment such as temperature, humidity, and atmospheric pressure, the development bias, the development bias application time, the charge amount of the toner T, and the toner on the surface of the development roller 2. It varies depending on the amount of adhesion.

本実施例において、本発明者らの実験によれば、感光ドラム1の直径30mm、現像ローラ2の直径を16mm、SDギャップを300μm、現像ローラ2表面トナーTの平均帯電量を40μC/g、現像ローラ2上表面単位面積当たりのトナー付着量を0.5mg/cm2として、1気圧、20℃湿度60%の環境下のもと感光ドラム1と現像ローラ2との間に、周波数2500Hz、交流振幅2000VのACバイアスを1秒間印加した場合、現像領域70は現像ローラ2の周方向に4mmとなった。 In the present embodiment, according to experiments by the present inventors, the diameter of the photosensitive drum 1 is 30 mm, the diameter of the developing roller 2 is 16 mm, the SD gap is 300 μm, the average charge amount of the toner T on the surface of the developing roller 2 is 40 μC / g, The toner adhesion amount per surface area on the developing roller 2 is 0.5 mg / cm 2 , and the frequency is 2500 Hz between the photosensitive drum 1 and the developing roller 2 under the environment of 1 atm and 20 ° C. and 60% humidity. When an AC bias having an AC amplitude of 2000 V was applied for 1 second, the developing area 70 was 4 mm in the circumferential direction of the developing roller 2.

このように、周方向に交差する方向つまり軸方向において、現像ローラ2の画像保証領域より広い領域にわたって、先端5aが現像領域70内に存在するように、制御部材5を設けることによって、トナーの掃き寄せ部分が、制御部材5に規制されて、感光ドラム1表面に付着せず、長期にわたって、良好な画像を形成することが可能となった。そして、更に、現像ローラ2回転方向で上流側に設けられることによって、この効果が確実となった。   In this way, by providing the control member 5 so that the tip 5a exists in the developing region 70 over a region wider than the image guarantee region of the developing roller 2 in the direction intersecting the circumferential direction, that is, in the axial direction, The sweeping portion is restricted by the control member 5 and does not adhere to the surface of the photosensitive drum 1, and it is possible to form a good image over a long period of time. Further, this effect is ensured by being provided upstream in the rotation direction of the developing roller 2.

実施例2
本実施例は、実施例1と同様の構成及び設定条件の現像装置100において、飛翔現像剤制御部材5の現像ローラ2軸方向の幅のみを変更したものである。
Example 2
In this embodiment, only the width of the flying developer control member 5 in the direction of the developing roller 2 axis is changed in the developing device 100 having the same configuration and setting conditions as in the first embodiment.

図5は、本実施例における感光ドラム1側から見た制御部材5の配置構成図である。現像装置100の構成及び動作について、実施例1と同様であるものについて、その説明を省略する。   FIG. 5 is an arrangement configuration diagram of the control member 5 viewed from the photosensitive drum 1 side in the present embodiment. About the structure and operation | movement of the image development apparatus 100, about the thing similar to Example 1, the description is abbreviate | omitted.

本実施例においては、制御部材5の現像ローラ2軸方向の長さが、現像ローラ2表面軸方向におけるトナーコート層の幅よりも長く配置している。   In the present embodiment, the length of the control member 5 in the axial direction of the developing roller 2 is longer than the width of the toner coat layer in the axial direction of the surface of the developing roller 2.

画像形成の条件によっては、画像保証領域よりも広い面積において現像がなされることもある。又、現像領域70よりも幅広く現像ローラ2にトナー層を設けることもある。こうした場合は、現像ローラ2のトナーコート層よりも幅広く制御部材5を設けると掃き寄せトナーの発生をより確実に防止できる。   Depending on the image forming conditions, development may be performed in an area larger than the image guarantee area. Further, a toner layer may be provided on the developing roller 2 wider than the developing area 70. In such a case, if the control member 5 is provided wider than the toner coat layer of the developing roller 2, the generation of the sweeping toner can be prevented more reliably.

ここで、以下に比較例1を用いて実施例1及び実施例2の効果を説明する。   Here, the effect of Example 1 and Example 2 is demonstrated using the comparative example 1 below.

比較例1
図12は比較例1における感光ドラム1側から見た制御部材5の配置構成図である。本比較例は、実施例1と同様の構成及び設定条件の現像装置100において、制御部材5の現像ローラ2軸方向の幅のみを変更したものである。現像装置100の構成及び動作について、実施例1と同様であるものについて、その説明を省略する。
Comparative Example 1
FIG. 12 is an arrangement configuration diagram of the control member 5 as viewed from the photosensitive drum 1 side in the first comparative example. In this comparative example, only the width of the control member 5 in the axial direction of the developing roller 2 is changed in the developing device 100 having the same configuration and setting conditions as in the first embodiment. About the structure and operation | movement of the image development apparatus 100, about the thing similar to Example 1, the description is abbreviate | omitted.

比較例1においては、図12に示したように、制御部材5の感光ドラム1及び現像ローラ2軸方向の幅が画像保証領域よりも短い構成である。   In Comparative Example 1, as shown in FIG. 12, the width of the control member 5 in the axial direction of the photosensitive drum 1 and the developing roller 2 is shorter than the image guarantee area.

表1に実施例1、実施例2についての画像不良における本比較例との比較を示す。   Table 1 shows a comparison between the first and second image defects in the first and second embodiments and this comparative example.

Figure 0004086736
Figure 0004086736

表1に示すように、本比較例のように感光ドラム1及び現像ローラ2軸方向の幅が、画像保証領域よりも飛翔現像剤制御部材5が狭い構成においては、画像端部のはき寄せ画像を防止することができず、現像ローラ2と感光ドラム1との対向部にて掃き寄せられたトナーが飛散して、現像ローラ2表面への飛散トナーのボタ落ちや現像装置100の飛散トナー汚れも生じる。   As shown in Table 1, when the flying developer control member 5 has a narrower width in the axial direction of the photosensitive drum 1 and the developing roller 2 than in the image guarantee area as in this comparative example, the edge of the image is gathered. The image cannot be prevented, and the toner swept up at the facing portion between the developing roller 2 and the photosensitive drum 1 is scattered, so that the scattered toner drops onto the surface of the developing roller 2 or the scattered toner of the developing device 100. Dirt is also produced.

よって、実施例1のように、画像保証領域よりも制御部材5を長くすることで、これらの、画像の端部まではき寄せ画像、トナーのボタ落ち、トナー汚れを防止し、現像装置100の寿命近くまで問題ないレベルに維持することができる。   Therefore, as in the first exemplary embodiment, the control member 5 is made longer than the image guarantee area, thereby preventing the image that reaches the edge of the image, the toner dropping, and the toner contamination, and the developing device 100. Can be maintained at a problem-free level until near the end of its service life.

又、実施例2のように、現像ローラ2表面トナーコート層の長さよりも制御部材5の長さを長くすることで、確実に端部のはき寄せ画像やトナーのボタ落ち等を防止することが可能となる。   Further, as in the second embodiment, by making the length of the control member 5 longer than the length of the toner coat layer on the surface of the developing roller 2, it is possible to surely prevent the edge-appearing image and toner from dropping off. It becomes possible.

実施例3
本実施例は、実施例1と同様の構成及び設定条件の現像装置100において、飛翔現像剤制御部材5の配置のみを変更したものである。
Example 3
In this embodiment, only the arrangement of the flying developer control member 5 is changed in the developing device 100 having the same configuration and setting conditions as in the first embodiment.

図6は、本実施例における現像ローラ2及び感光ドラム1回転方向に対して側面からみた現像領域70付近の拡大図である。又、図7は、本実施例における感光ドラム1側から見た制御部材5の配置構成図である。現像装置100の構成及び動作について、実施例1と同様であるものについて、その説明を省略する。   FIG. 6 is an enlarged view of the vicinity of the developing region 70 as viewed from the side with respect to the rotation direction of the developing roller 2 and the photosensitive drum 1 in this embodiment. FIG. 7 is an arrangement configuration diagram of the control member 5 viewed from the photosensitive drum 1 side in this embodiment. About the structure and operation | movement of the image development apparatus 100, about the thing similar to Example 1, the description is abbreviate | omitted.

本実施例では、板状部材である制御部材5が現像領域70に存在する端辺5aを先端として、そこから現像ローラ2回転方向上流側に向かう長さをLとして、その長さLを、端部長さLとして、下記のように定める。   In this embodiment, the control member 5 which is a plate-like member has an end 5a existing in the developing region 70 as a leading end, and a length from the end 5a toward the upstream side in the rotation direction of the developing roller 2 is defined as L. The end length L is determined as follows.

ここでは、板状部材である制御部材5において、端辺5aと対称の位置にある端辺5bの位置を、制御部材5を構成する板状部材が、制御部材5として存在する領域の端辺とする。例えば、本実施例では、制御部材5を構成する板状部材は、端辺5aと対向する端辺部分が他の部材、ここでは現像容器100aに取り付けられており、その現像容器100aと制御部材5との間の部分は、制御部材5より幅が狭くなっている。この、狭くなった部分を現像容器100aの取り付け部分として、この現像容器100a取り付け部分を無視して、制御部材5として存在している部分の端辺、つまり現像容器100aとの取り付け部分との境界を端辺5bとして考える。そして、端辺5aと端辺5bとの間の距離、つまり、板状部材である制御部材5の端辺5aと交差する方向の長さを端部長さLとする。   Here, in the control member 5 that is a plate-like member, the position of the end side 5 b that is symmetrical to the end side 5 a is set to the end side of the region where the plate-like member that constitutes the control member 5 exists as the control member 5. And For example, in this embodiment, the plate-like member constituting the control member 5 has an end portion facing the end side 5a attached to another member, here, the developing container 100a, and the developing container 100a and the control member The width between the portions 5 is narrower than that of the control member 5. The narrowed portion is used as a mounting portion of the developing container 100a, and the developing container 100a mounting portion is ignored, and the boundary between the end of the portion existing as the control member 5, that is, the mounting portion with the developing container 100a. Is considered as the edge 5b. The distance between the end side 5a and the end side 5b, that is, the length in the direction intersecting the end side 5a of the control member 5 that is a plate-like member is defined as the end portion length L.

そして、制御部材5を現像ローラ2回転方向上流側から侵入させた板状部材と考えると、侵入先端を端辺5aとするので、端辺5bは侵入開始部ともいえる。そして、端部長さL方向は、制御部材5に沿った方向で、現像領域70への侵入方向といえる。   When the control member 5 is considered to be a plate-like member that has entered from the upstream side in the rotation direction of the developing roller 2, the intrusion tip is the end side 5a, so the end side 5b can be said to be an entry start portion. The end length L direction is a direction along the control member 5 and can be said to be an entry direction into the development region 70.

この端部長さLは、図6、図7に示したように、現像ローラ2周面において、制御部材5先端部分5aと対向する部分から、現像ローラ2と感光ドラム1との回転軸を結ぶ中心線分P1を基準として現像ローラ2逆回転方向で30°以上の領域にわたって、現像ローラ2表面トナーコート層を覆うような長さが必要である。   As shown in FIGS. 6 and 7, this end portion length L connects the rotation shafts of the developing roller 2 and the photosensitive drum 1 from the portion facing the front end portion 5 a of the control member 5 on the circumferential surface of the developing roller 2. The length is required to cover the toner coat layer on the surface of the developing roller 2 over an area of 30 ° or more in the reverse rotation direction of the developing roller 2 with respect to the center line segment P1.

つまり、現像ローラ2の中心から、現像ローラ2周面において上記中心線分P1を0°とし、そこから現像ローラ2の逆回転方向で30°の方向に、延長された現像ローラ2半径延長部をP2とするとき、その延長部P2と制御部材5が交差する位置5cより外側に、即ち、制御部材5に沿った方向で、現像ローラ2半径延長部P2と交差する位置5cより、制御部材端辺5aからの距離である端部長さLが長い位置に、侵入開始部5bが存在していることが必要である。   That is, from the center of the developing roller 2, the center line segment P1 is set to 0 ° on the circumferential surface of the developing roller 2, and the developing roller 2 radius extension portion extended from there in the direction of 30 ° in the reverse rotation direction of the developing roller 2. Is set to P2, the control member is located outside the position 5c where the extension P2 and the control member 5 intersect, that is, in the direction along the control member 5, from the position 5c where the development roller 2 radius extension P2 intersects. It is necessary that the intrusion start portion 5b exists at a position where the end portion length L, which is the distance from the end side 5a, is long.

端部長さLを上記のように定めることで、掃き寄せトナーが感光ドラム1に移動するのを、長期にわたって防止することが可能となる。   By determining the end length L as described above, it is possible to prevent the sweeping toner from moving to the photosensitive drum 1 over a long period of time.

以下に比較例2を用いて本実施例の効果を説明する。   The effect of the present embodiment will be described below using Comparative Example 2.

比較例2
図13は、本比較例3における感光ドラム1側から見た制御部材5の端部配置図である。又、図14は、本比較例における現像領域70付近の拡大説明図である。
Comparative Example 2
FIG. 13 is an end layout diagram of the control member 5 as viewed from the photosensitive drum 1 side in the third comparative example. FIG. 14 is an enlarged explanatory view in the vicinity of the development region 70 in this comparative example.

本比較例は、実施例1と同様の構成及び設定条件の現像装置100において、飛翔現像剤制御部材5の配置のみを変更したものである。現像装置100の構成及び動作について、実施例1と同様であるものについて、その説明を省略する。   In this comparative example, only the arrangement of the flying developer control member 5 is changed in the developing device 100 having the same configuration and setting conditions as in the first embodiment. About the structure and operation | movement of the image development apparatus 100, about the thing similar to Example 1, the description is abbreviate | omitted.

本比較例の特徴として、図13、14に示したように、実施例3とは違って、端部長さLが、制御部材5先端部分5aと現像ローラ2及び感光ドラム1とが対向する部分から、現像ローラ2と感光ドラム1との回転軸を結ぶ中心線分P1を基準として現像ローラ2逆回転方向で30°以上の領域にわたって、現像ローラ2表面トナーコート層を覆うような長さがないように配置した。   As a feature of this comparative example, as shown in FIGS. 13 and 14, unlike the third embodiment, the end length L is a portion where the front end portion 5 a of the control member 5 faces the developing roller 2 and the photosensitive drum 1. From the center line P1 connecting the rotation axes of the developing roller 2 and the photosensitive drum 1, the length that covers the toner coat layer on the surface of the developing roller 2 over a region of 30 ° or more in the reverse rotation direction of the developing roller 2 Arranged not to.

ここで、現像領域70に部材5を挿入させた非接触現像方式の現像装置における懸念点について説明する。   Here, the concern in the non-contact developing type developing apparatus in which the member 5 is inserted into the developing region 70 will be described.

図15は現像領域70上流側におけるトナーの動きを示したモデル図である。符号に関して実施例1と同様であり、その説明を省略する。   FIG. 15 is a model diagram showing toner movement on the upstream side of the development area 70. The reference numerals are the same as those in the first embodiment, and the description thereof is omitted.

図中矢印の方向に順方向に回転駆動している感光ドラム1及び現像ローラ2の、両者の間に現像バイアスを印加している時、トナーは図中矢印方向、つまり大きく現像ローラ2及び感光ドラム1の表面に沿った方向にジグザグに揺れながら、現像ローラ2から感光ドラム1への方向に移動している。   When a developing bias is applied between the photosensitive drum 1 and the developing roller 2 that are rotationally driven in the forward direction in the direction of the arrow in the drawing, the toner is in the direction of the arrow in the drawing, that is, the developing roller 2 and the photosensitive roller. While moving zigzag in the direction along the surface of the drum 1, it moves in the direction from the developing roller 2 to the photosensitive drum 1.

即ち、SDギャップ中央付近にあるトナーは樽型電界の影響を受け、現像領域70中心Sから外側に向かって移動している。一方、感光ドラム1及び現像ローラ2の表面近傍にあるトナーは、感光ドラム1及び現像ローラ2の回転によって発生する気流の影響を受けてそれらの回転方向に移動している。   That is, the toner near the center of the SD gap is affected by the barrel-shaped electric field and moves outward from the center S of the development area 70. On the other hand, the toner in the vicinity of the surfaces of the photosensitive drum 1 and the developing roller 2 is moved in the rotation direction under the influence of the airflow generated by the rotation of the photosensitive drum 1 and the developing roller 2.

こうしたトナーTの運動によって、現像領域70上流側に存在するトナーは、図に示したように渦巻きながら動いている。ここで、制御部材5が存在する場合は、その場合のトナーTの動きをモデル化した図16に示すように、制御部材5が存在することにより、トナーTが運動するスペースが狭くなるため、現像ローラ2と制御部材5との間で飛翔するトナーTの動きがより激しくなる。   Due to the movement of the toner T, the toner existing on the upstream side of the developing region 70 moves while swirling as shown in the drawing. Here, when the control member 5 exists, the space in which the toner T moves is reduced by the presence of the control member 5 as shown in FIG. 16 which models the movement of the toner T in that case. The movement of the toner T flying between the developing roller 2 and the control member 5 becomes more intense.

この現象によって、現像ローラ2回転方向の上流側及び、現像ローラ2端部の現像領域70外においても、トナーTが飛翔する。そして、この飛翔したトナーTが制御部材5の感光ドラム1側の面に飛翔トナーが溜まる現象が発生する。この結果の様子をモデル図である図17に示す。制御部材5の感光ドラム1側の面に、特に現像ローラ2軸方向に平行な方向で端部に飛散トナーTが付着している。このようなトナーが画像形成動作を繰り返し行うことにより増加してくると、以下のような不具合を生じる。   Due to this phenomenon, the toner T flies also on the upstream side in the rotation direction of the developing roller 2 and outside the developing area 70 at the end of the developing roller 2. Then, the flying toner accumulates on the surface of the control member 5 on the photosensitive drum 1 side. The result is shown in FIG. 17 which is a model diagram. The scattered toner T adheres to the surface of the control member 5 on the side of the photosensitive drum 1, particularly at the end in a direction parallel to the developing roller biaxial direction. When such toner increases due to repeated image forming operations, the following problems occur.

1:画像端部におけるはき寄せ画像の発生
これは、飛翔現像剤制御部材5の感光ドラム1側面に溜まったトナーが、現像バイアスの振動電界によって感光ドラム1と制御部材5の間で往復運動を行い、はき寄せ画像を形成してしまう画像不良である。
1: Generation of a close-up image at the edge of the image This is because toner accumulated on the side surface of the photosensitive drum 1 of the flying developer control member 5 reciprocates between the photosensitive drum 1 and the control member 5 due to an oscillating electric field of the developing bias. This is an image defect that forms a close-up image.

2:はき寄せ画像のムラ
これは、制御部材5の感光ドラム1側面に溜まったトナーによって、制御部材5がクラウン形状等に変形し、長手方向の中央部と端部とで、はき寄せを防止する効果にムラが生じてしまう画像不良である。
2: Unevenness of the contact image This is because the control member 5 is deformed into a crown shape or the like by the toner accumulated on the side surface of the photosensitive drum 1 of the control member 5, and the contact is made between the central portion and the end portion in the longitudinal direction. This is an image defect that causes unevenness in the effect of preventing the image.

3:トナーボタ落ちによる画像不良
これは、制御部材5の感光ドラム1側面に溜まったトナーが現像ローラ2表面にトナー塊として落ちてしまい、その部分だけ画像濃度が異常に高くなってしまう画像不良である。
3: Image failure due to toner-fogging drop This is an image failure in which the toner accumulated on the side surface of the photosensitive drum 1 of the control member 5 falls as a toner lump on the surface of the developing roller 2 and the image density becomes abnormally high only at that portion. is there.

4:現像装置のトナー汚れ
これは、制御部材5の感光ドラム1側面に溜まったトナーTが制御部材5自身の振動によって飛散し、現像装置100が飛散トナーによって汚れてしまう不具合である。特に、画像形成動作を繰り返し行った現像装置100内のトナーは、外添剤が剥ぎ取られ帯電能力が低下してしまい、飛散し易い。
4: Toner contamination of the developing device This is a problem that the toner T collected on the side surface of the photosensitive drum 1 of the control member 5 is scattered by the vibration of the control member 5 itself, and the developing device 100 is contaminated by the scattered toner. In particular, the toner in the developing device 100 that has repeatedly performed the image forming operation is likely to be scattered because the external additive is peeled off and the charging ability is lowered.

比較例2においては、制御部材5の端部長さLが短かったために、現像ローラ2回転方向上流側より、飛翔トナーTが制御部材5表面に溜まり、上記した問題が発生してしまう。   In Comparative Example 2, since the end portion length L of the control member 5 is short, the flying toner T accumulates on the surface of the control member 5 from the upstream side in the rotation direction of the developing roller 2, and the above-described problem occurs.

ここで、制御部材5が現像ローラコート層を覆う現像ローラ2の表面角度領域と、トナー飛散量との関係を、図18に示す。トナー飛散量とは、現像領域70の外側に飛散したトナーを捕集するシート部材を設け、シート部材に付着したトナーの重量を測定して求めたものである。   Here, the relationship between the surface angle area of the developing roller 2 where the control member 5 covers the developing roller coat layer and the toner scattering amount is shown in FIG. The toner scattering amount is obtained by providing a sheet member for collecting the toner scattered outside the developing region 70 and measuring the weight of the toner attached to the sheet member.

実施例1の現像装置100を用いて、4000枚通紙したときの制御部材5表面に付着するトナー量を測定した。この現像装置100の制御部材端部長さLは任意に変化させ、又、現像ローラ2の径を外径16mmと外径12mmを用いて比較した。   Using the developing device 100 of Example 1, the amount of toner adhering to the surface of the control member 5 when 4000 sheets were passed was measured. The control member end length L of the developing device 100 was arbitrarily changed, and the diameter of the developing roller 2 was compared using an outer diameter of 16 mm and an outer diameter of 12 mm.

ここで、トナー飛散量が20mg以下であれば、現像装置寿命末期まで、上記不具合を防止することができる。又、現像ローラ径16mm、12mmともに制御部材5が現像ローラコート層を覆う現像ローラ2の表面角度領域が30°以下ではトナー飛散量が20mg以上であり、上記した問題が発生してしまった。30°以上の場合は、トナー飛散量20mg以下であり、現像装置寿命末期まで上記不具合を防止することができた。   Here, when the toner scattering amount is 20 mg or less, the above-described problem can be prevented until the end of the developing device life. Further, when the surface angle region of the developing roller 2 where the control member 5 covers the developing roller coat layer is 30 ° or less for both the developing roller diameters of 16 mm and 12 mm, the toner scattering amount is 20 mg or more, and the above-described problem occurs. When the angle was 30 ° or more, the toner scattering amount was 20 mg or less, and the above-described problems could be prevented until the end of the developing device life.

つまり、実施例3のように、制御部材5が現像ローラコート層を覆う現像ローラ2の表面角度領域を、30°以上つまり、制御部材5の他端辺である侵入開始部5bが、現像ローラ2の逆回転方向の角度で、現像ローラ2と感光ドラム1との回転中心を結ぶ位置を0°として、30°の方向に現像ローラ2の半径を延長させた延長部P2と交差する位置より、制御部材5に沿った方向で、制御部材端辺5aからの距離Lが長い位置にあることで、本発明の効果を得ることできる。   That is, as in Example 3, the surface angle region of the developing roller 2 where the control member 5 covers the developing roller coating layer is 30 ° or more, that is, the intrusion start portion 5b which is the other end of the control member 5 is From the position intersecting with the extension P2 that extends the radius of the developing roller 2 in the direction of 30 °, where the angle connecting the rotation center of the developing roller 2 and the photosensitive drum 1 is 0 ° at an angle of 2 in the reverse rotation direction. The effect of the present invention can be obtained when the distance L from the control member end side 5a is long in the direction along the control member 5.

尚、制御部材5端部長さLは長いほど先端位置精度を出すことが難しくなってくる為、50mm以下が好ましい。   Note that the longer the end length L of the control member 5 is, the more difficult it is to obtain the tip position accuracy.

表2に画像不良における実施例3と本比較例との比較を示す。   Table 2 shows a comparison between Example 3 and this comparative example in terms of image defects.

Figure 0004086736
Figure 0004086736

表2に示すように、本比較例にて現像装置の寿命近くにて生じていた飛散トナーのボタ落ちやトナー汚れが、実施例3では、現像装置の寿命近くまで問題ないレベルに維持することができる。   As shown in Table 2, the scattered toner splashing and toner contamination that occurred near the life of the developing device in this comparative example should be maintained at a level that does not cause any problem until the life of the developing device is reached in Example 3. Can do.

実施例4
本実施例は、実施例1と同様の構成及び設定条件の現像装置100において、飛翔現像剤制御部材5の配置のみを変更したものである。
Example 4
In this embodiment, only the arrangement of the flying developer control member 5 is changed in the developing device 100 having the same configuration and setting conditions as in the first embodiment.

図8は本実施例における感光ドラム1側から見た制御部材5の配置構成図である。現像装置100の構成及び動作について、実施例1と同様であるものについて、その説明を省略する。   FIG. 8 is an arrangement configuration diagram of the control member 5 viewed from the photosensitive drum 1 side in this embodiment. About the structure and operation | movement of the image development apparatus 100, about the thing similar to Example 1, the description is abbreviate | omitted.

本実施例の特徴としては、図8に示したように、制御部材5の現像ローラ2軸方向に平行な方向で端部のみが、現像領域70の現像ローラ2周面方向における領域Gを覆うように配置した。制御部材5の感光ドラム1及び現像ローラ2軸方向中央部は、現像領域の中央部から覆っている。   As a feature of this embodiment, as shown in FIG. 8, only the end portion of the control member 5 in the direction parallel to the developing roller biaxial direction covers the region G of the developing region 70 in the circumferential direction of the developing roller 2. Arranged. The central portion of the control member 5 in the axial direction of the photosensitive drum 1 and the developing roller 2 covers the central portion of the developing area.

尚、ここで制御部材5の現像ローラ2軸方向端部とは、少なくとも現像ローラ2における画像保証領域より端部側のことをいう。   Here, the end portion of the control member 5 in the axial direction of the developing roller 2 means at least the end portion side of the image guarantee area in the developing roller 2.

通常、飛散トナーは感光ドラム1及び現像ローラ2の回転によって発生する気流の方向に飛散するが、端部においては、SDコロ等によって気流が乱れている。そのため、端部付近のトナーは様々な方向に飛散してしまう。また、端部付近より飛散したトナーは再度、現像ローラ2上や感光ドラム1上に回収されず、現像装置100の外部へ飛散し易い。   Usually, the scattered toner scatters in the direction of the air flow generated by the rotation of the photosensitive drum 1 and the developing roller 2, but the air flow is disturbed by the SD roller or the like at the end. Therefore, the toner near the end is scattered in various directions. Further, the toner scattered from the vicinity of the end portion is not collected again on the developing roller 2 or the photosensitive drum 1 and is easily scattered outside the developing device 100.

そこで、本実施例のように、飛翔現像剤制御部材5の長手方向の端部が、飛散トナーを発生させる領域である現像領域70を覆うように配置することで、現像ローラ2端部から飛散するトナーを低減することが可能となり、上記した不具合を低減することができる。   Therefore, as in this embodiment, the end of the flying developer control member 5 in the longitudinal direction covers the developing area 70 that is the area where the scattered toner is generated, so that the scattering from the end of the developing roller 2 occurs. Therefore, it is possible to reduce the amount of toner, and the above-described problems can be reduced.

実施例5
本実施例は、実施例1と同様の構成及び設定条件の現像装置100において、飛翔現像剤制御部材5の配置のみを変更したものである。
Example 5
In this embodiment, only the arrangement of the flying developer control member 5 is changed in the developing device 100 having the same configuration and setting conditions as in the first embodiment.

図9は本実施例における現像領域70端部を拡大した拡大図である。現像装置100の構成及び動作について、実施例1と同様であるものについて、その説明を省略する。   FIG. 9 is an enlarged view of an end portion of the developing area 70 in this embodiment. About the structure and operation | movement of the image development apparatus 100, about the thing similar to Example 1, the description is abbreviate | omitted.

本実施例の特徴として、図9に示したように、飛翔現像剤制御部材54の感光ドラム1及び現像ローラ2軸方向端部が現像ローラ2側に屈折している。   As a feature of this embodiment, as shown in FIG. 9, the axial ends of the flying developer control member 54 in the photosensitive drum 1 and developing roller 2 axial direction are refracted to the developing roller 2 side.

本実施例のような構成をとることで、現像ローラ2端部から現像装置100の外部へ向かう空間をふさぐことで、現像装置100外部へ向かう飛散トナーを外部に出すことがない。それによって、上記した画像不良を低減する。特に、飛散トナーによる現像装置の汚れを防止することが可能となる。   By adopting the configuration as in the present embodiment, the space from the end of the developing roller 2 toward the outside of the developing device 100 is blocked, so that the scattered toner toward the outside of the developing device 100 is not emitted to the outside. Thereby, the above-mentioned image defects are reduced. In particular, it is possible to prevent the developing device from being contaminated by scattered toner.

実施例6
本実施例は、実施例1と同様の構成及び設定条件の現像装置100において、飛翔現像剤制御部材5の配置のみを変更したものである。
Example 6
In this embodiment, only the arrangement of the flying developer control member 5 is changed in the developing device 100 having the same configuration and setting conditions as in the first embodiment.

図10は本実施例における現像領域70端部を拡大した構成図である。現像装置100の構成及び動作について、実施例1と同様であるものについて、その説明を省略する。   FIG. 10 is an enlarged configuration diagram of the end portion of the development area 70 in this embodiment. About the structure and operation | movement of the image development apparatus 100, about the thing similar to Example 1, the description is abbreviate | omitted.

本実施例の特徴として図10に示したように、飛翔現像剤制御部材5の端部は現像ローラ2の両端に設けられたSDコロ21に接触又は近接して配置されている。   As shown in FIG. 10 as a feature of the present embodiment, the end of the flying developer control member 5 is arranged in contact with or close to the SD rollers 21 provided at both ends of the developing roller 2.

これによって、飛翔現像剤制御部材5の取付が安定し、トナーの掃き寄せ防止を長期にわたって行い、良好な画像形成が実現できる。   As a result, the flying developer control member 5 can be stably attached, toner can be prevented from sweeping for a long time, and good image formation can be realized.

そして、飛散トナーを外部に出すことがない。それによって、上記した不具合を低減する。特に、飛散トナーによる現像装置の汚れを防止することが可能となる。   In addition, the scattered toner is not discharged outside. Thereby, the above-mentioned problems are reduced. In particular, it is possible to prevent the developing device from being contaminated by scattered toner.

実施例7
本実施例は、実施例1と同様の構成及び設定条件の現像装置100において、飛翔現像剤制御部材5の配置のみを変更したものである。
Example 7
In this embodiment, only the arrangement of the flying developer control member 5 is changed in the developing device 100 having the same configuration and setting conditions as in the first embodiment.

図11は本実施例における感光ドラム1側から見た飛翔現像剤制御部材5の配置構成図である。現像装置100の構成及び動作について、実施例1と同様であるものについて、その説明を省略する。   FIG. 11 is an arrangement configuration diagram of the flying developer control member 5 viewed from the photosensitive drum 1 side in this embodiment. About the structure and operation | movement of the image development apparatus 100, about the thing similar to Example 1, the description is abbreviate | omitted.

本実施例の特徴として、図11に示したように、飛翔現像剤制御部材5の回転ドラム1及び現像ローラ2軸方向の幅が、現像ローラ2表面トナーコート層長さよりも広く配置し、且つ飛翔現像剤制御部材5が飛翔現像剤制御部材5先端位置から、中心線分Pから30度以上の現像ローラ表面トナーコート層を覆うように配置した。つまり、実施例2と3とを合わせた構成である。   As a feature of this embodiment, as shown in FIG. 11, the width of the flying developer control member 5 in the axial direction of the rotating drum 1 and the developing roller 2 is arranged wider than the length of the toner coat layer on the surface of the developing roller 2, and The flying developer control member 5 was disposed so as to cover the toner coat layer of the developing roller surface 30 degrees or more from the center line segment P from the front end position of the flying developer control member 5. That is, the configuration is a combination of the second and third embodiments.

画像形成の条件によっては、画像保証領域よりも広い面積において現像がなされたり、現像領域よりも幅広く現像ローラにトナー層を設ける場合にも、長期にわたって、現像ローラのトナーコート層よりも幅広く飛翔現像剤制御部材5を設けると掃き寄せトナーの発生をより確実に防止できる。   Depending on the image forming conditions, even if development is performed in an area larger than the image guarantee area or a toner layer is provided on the developing roller wider than the development area, the flying development is wider than the toner coat layer of the developing roller over a long period of time. Providing the agent control member 5 can more reliably prevent the generation of sweeping toner.

ここで、実施例1〜実施例7の効果を比較例1、2とともにを以下の表3にまとめた。   Here, the effects of Examples 1 to 7 are summarized in Table 3 below together with Comparative Examples 1 and 2.

Figure 0004086736
Figure 0004086736

表3から、実施例1又は2のように、現像領域に侵入する板状部材である飛翔現像剤制御部材を像担持体軸方向に画像形成領域又はトナーコート領域を覆うように設置することで、画像端部からのはき寄せ画像を防止することができる。そして、実施例3のように、この制御部材が更に、現像領域に交差する方向には、先端から、像担持体と現像剤担持体の中心を結ぶ直線から現像剤担持体回転方向30°部分の現像剤担持体半径延長線に交差する位置まで長さを有する、つまり現像剤担持体周面において、制御部材先端部分と対向する部分からの長さが、現像剤担持体と像担持体との回転軸を結ぶ中心線分P1を基準として現像剤担持体逆回転方向で30°以上の領域にわたって、現像剤担持体表面トナーコート層を覆うような長さを有することで、現像装置の寿命末期の状態においても画像の端部からのはき寄せ画像やはき寄せのムラ及びトナー飛散を低減することができる。又、実施例4のように飛翔現像剤制御部材の軸方向端部が現像領域を覆うようにすると、現像ローラ端部からのトナー飛散を低減することができる。実施例5のように、飛翔現像剤制御部材の軸方向端部が現像剤担持体に向かって屈折する形状であることにより効果的にはき寄せ画像とトナー飛散を防止することができる。実施例6のように、飛翔現像剤制御部材の端部が像担持体や現像剤担持体との間隔を一定に保っていることにより、現像ローラ回転方向の上流側より発生するトナー飛散を確実に防止することができる。そして、実施例7のように、実施例2と3を掛け合わせることで、表3に示すように、良好な画像形成を現像装置寿命まで、維持することが更に完璧にできた。   From Table 3, as shown in Example 1 or 2, the flying developer control member, which is a plate-like member that enters the developing area, is installed so as to cover the image forming area or the toner coat area in the axial direction of the image carrier. In addition, it is possible to prevent a close-up image from the edge of the image. Further, as in the third embodiment, in the direction in which the control member further intersects the development region, the developer carrier rotation direction 30 ° portion from the straight line connecting the center of the image carrier and the developer carrier from the tip. The developer carrier has a length up to a position intersecting with the radial extension line of the developer carrier, i.e., the length from the portion facing the front end portion of the control member on the developer carrier circumferential surface is the developer carrier and the image carrier. The developer carrier has a length that covers the toner coat layer on the surface of the developer carrier over a region of 30 ° or more in the reverse rotation direction of the developer carrier relative to the center line segment P1 connecting the rotation axes of Even in the final state, it is possible to reduce the contact image from the end portion of the image, uneven contact, and toner scattering. Further, if the axial end portion of the flying developer control member covers the developing area as in the fourth embodiment, toner scattering from the end portion of the developing roller can be reduced. As in the fifth exemplary embodiment, the axial end portion of the flying developer control member is refracted toward the developer carrying member, so that it is possible to effectively prevent a close-up image and toner scattering. As in the sixth embodiment, the end of the flying developer control member keeps the distance between the image carrier and the developer carrier constant, so that the toner scattering generated from the upstream side in the rotation direction of the developing roller can be ensured. Can be prevented. Then, as in Example 7, by multiplying Examples 2 and 3, as shown in Table 3, it was possible to maintain satisfactory image formation until the lifetime of the developing device more completely.

尚、本実施例において非磁性一成分非接触現像装置について説明したが、現像領域内に飛翔現像剤制御部材を有する非接触現像装置において、本発明を適用することで上記した効果を得ることができる。   In the present embodiment, the non-magnetic one-component non-contact developing device has been described. However, in the non-contact developing device having the flying developer control member in the developing region, the above-described effects can be obtained by applying the present invention. it can.

以上に説明した画像形成装置の構成部品の寸法、材質、形状、及びその相対位置などは、特に特定的な記載がない限りは、この発明の範囲をそれらのみに限定する趣旨のものではない。   The dimensions, materials, shapes, and relative positions of the components of the image forming apparatus described above are not intended to limit the scope of the present invention only to those unless otherwise specified.

本発明に係る現像装置の実施例1〜実施例7を示す断面図である。It is sectional drawing which shows Example 1-Example 7 of the image development apparatus concerning this invention. 本発明の実施例1における現像領域周辺の部材構成を示す側面図である。It is a side view which shows the member structure of the image development area periphery in Example 1 of this invention. 本発明の実施例1における現像領域周辺の部材構成を示す正面図である。It is a front view which shows the member structure of the image development area periphery in Example 1 of this invention. 本発明に係る現像領域の定義を示す説明図である。It is explanatory drawing which shows the definition of the image development area | region which concerns on this invention. 本発明の実施例2における現像領域周辺の部材構成を示す正面図である。It is a front view which shows the member structure of the image development area periphery in Example 2 of this invention. 本発明の実施例3における現像領域周辺の部材構成を示す側面図である。It is a side view which shows the member structure of the image development area periphery in Example 3 of this invention. 本発明の実施例3における現像領域周辺の部材構成を示す正面図である。It is a front view which shows the member structure of the image development area periphery in Example 3 of this invention. 本発明の実施例4における現像領域周辺の部材構成を示す正面図である。It is a front view which shows the member structure of the image development area periphery in Example 4 of this invention. 本発明の実施例5における現像剤担持体端部構成を示す部分正面図である。It is a partial front view which shows the developer carrier end part structure in Example 5 of this invention. 本発明の実施例6における現像剤担持体端部構成を示す部分正面図である。It is a partial front view which shows the developer carrier end part structure in Example 6 of this invention. 本発明の実施例7における現像領域周辺の部材構成を示す正面図である。It is a front view which shows the member structure of the image development area periphery in Example 7 of this invention. 比較例1における現像領域周辺の部材構成を示す正面図である。6 is a front view showing a member configuration around a developing region in Comparative Example 1. FIG. 比較例2における現像領域周辺の部材構成を示す側面図である。12 is a side view showing a member configuration around a developing region in Comparative Example 2. FIG. 比較例2における現像領域周辺の部材構成を示す正面図である。10 is a front view showing a member configuration around a developing region in Comparative Example 2. FIG. 現像領域における現像剤の挙動を示す説明図である。It is explanatory drawing which shows the behavior of the developer in a development area. 比較例1における現像領域における現像剤の挙動を示す説明図である。6 is an explanatory diagram illustrating a behavior of a developer in a development region in Comparative Example 1. FIG. 記録材に飛散トナーが付着した様子を示す説明図である。FIG. 6 is an explanatory diagram illustrating a state where scattered toner adheres to a recording material. 飛翔現像剤制御部材が覆う現像剤担持体の中心線分からの角度領域と端部トナー飛散量との関係を示すグラフである。6 is a graph showing a relationship between an angle region from a center line of a developer carrying member covered by a flying developer control member and an end toner scattering amount. 本発明の現像装置が備えられる画像形成装置の一例を示す概略構成図である。1 is a schematic configuration diagram illustrating an example of an image forming apparatus provided with a developing device of the present invention. 従来例に係る現像領域における掃き寄せトナーの様子を示す説明図である。It is explanatory drawing which shows the state of the sweeping toner in the image development area | region which concerns on a prior art example.

符号の説明Explanation of symbols

1 感光ドラム(像担持体)
2 現像ローラ(現像剤担持体)
5 飛翔現像剤制御部材
70 現像領域
100 現像装置
21 コロ
T トナー(現像剤)
1 Photosensitive drum (image carrier)
2 Development roller (developer carrier)
5 Flying developer control member 70 Developing area 100 Developing device 21 Roll T Toner (Developer)

Claims (6)

現像剤を収容する現像容器と、前記現像剤を担持搬送する回転体である現像剤担持体と、を有し、静電潜像が形成され、該静電潜像を担持する回転体である像担持体に前記現像剤担持体を対向させ、該対向部に位置する現像領域にて、振動電界を形成し該振動電界により、前記現像剤担持体表面にて担持して前記現像領域に搬送された前記現像剤で、前記静電潜像を現像する現像装置において、
前記現像剤担持体の軸方向に平行な方向における前記像担持体の画像保証領域において、前記像担持体の回転方向上流から前記現像領域内に先端部が侵入した板状部材であり、前記現像剤担持体の軸方向に平行な方向の幅が、同方向における前記画像保証領域よりも広い飛翔現像剤制御部材を有し、前記飛翔現像剤制御部材の長手方向の端部における前記飛翔現像剤制御部材の先端部は、前記画像保証領域における前記飛翔現像剤制御部材の先端部よりも、前記像担持体の回転方向下流に突出して設けられることを特徴とする現像装置。
A developing container for accommodating a developer, said has a developer bearing member a developer which is a rotating member for carrying the transport, the electrostatic latent image is formed, it is a rotary member carrying the electrostatic latent image The developer carrying member is made to face the image carrier, and an oscillating electric field is formed in the developing area located at the facing portion. The vibrating electric field is carried on the surface of the developer carrying member and conveyed to the developing area. in the developer which is, in a developing device for developing the electrostatic latent image,
In the image guarantee area of the image carrier in a direction parallel to the axial direction of the developer carrier, a plate-like member having a tip portion entering the development area from the upstream in the rotation direction of the image carrier, the development member agent parallel width in the axial direction of the bearing member, have a broader flight developer control member than before Kiga image assurance area in the same direction, the flight in the longitudinal direction of the end portion of the flying developer control member The developing device according to claim 1, wherein a leading end portion of the developer control member is provided so as to protrude downstream in the rotation direction of the image carrier from the leading end portion of the flying developer control member in the image guarantee area .
前記飛翔現像剤制御部材は、前記現像剤担持体の回転方向の上流側から、前記現像領域に一端辺を配置させて侵入しており、前記飛翔現像剤制御部材の侵入開始部が、前記現像剤担持体の逆回転方向の角度で、前記現像剤担持体と前記像担持体との回転中心を結ぶ位置を0°として、30°の方向に前記現像剤担持体の半径を延長させた延長部と交差する位置より、前記飛翔現像剤制御部材に沿った方向で、前記現像領域に存在する前記飛翔現像剤制御部材の端辺からの距離が長い位置にあることを特徴とする請求項1の現像装置。   The flying developer control member enters from the upstream side in the rotation direction of the developer carrying member with one end arranged in the developing region, and the intrusion start portion of the flying developer control member is the development developer. An extension in which the radius of the developer carrier is extended in the direction of 30 ° with the angle connecting the rotation center of the developer carrier and the image carrier as 0 ° at an angle in the reverse rotation direction of the developer carrier. 2. The distance from the end of the flying developer control member existing in the development region in a direction along the flying developer control member from a position intersecting with a portion is longer. Development device. 前記飛翔現像剤制御部材の長手方向の端部は、前記現像領域の前記現像剤担持体回転方向の全領域と対向していることを特徴とする請求項1又は2の現像装置。 3. The developing device according to claim 1 , wherein an end portion of the flying developer control member in a longitudinal direction is opposed to an entire region of the developing region in a rotation direction of the developer carrying member. 前記飛翔現像剤制御部材の長手方向の端部が前記現像剤担持体に向かって屈折した形状を有することを特徴とする請求項1又は2の現像装置。 3. The developing device according to claim 1, wherein an end portion in a longitudinal direction of the flying developer control member has a shape refracted toward the developer carrying member. 前記飛翔現像剤制御部材の長手方向の端部が前記像担持体と前記現像剤担持体との間隔を一定に保つ部材に接触又は近接していることを特徴とする請求項1又は2の現像装置。 3. The development according to claim 1, wherein an end of the flying developer control member in a longitudinal direction is in contact with or close to a member that maintains a constant distance between the image carrier and the developer carrier. apparatus. 表面に静電潜像が形成される像担持体と、前記静電潜像を現像する請求項1〜5のいずれかの項に記載の現像装置を有することを特徴とする画像形成装置。   An image forming apparatus comprising: an image carrier on which an electrostatic latent image is formed on a surface; and the developing device according to claim 1 that develops the electrostatic latent image.
JP2003307593A 2003-06-17 2003-08-29 Developing device and image forming apparatus Expired - Fee Related JP4086736B2 (en)

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JP2003307593A JP4086736B2 (en) 2003-08-29 2003-08-29 Developing device and image forming apparatus
US10/865,759 US7415230B2 (en) 2003-06-17 2004-06-14 Developing apparatus featuring an insulating or electrically floating jumping developer regulation member
EP04014114.5A EP1489466B1 (en) 2003-06-17 2004-06-16 Developing apparatus
KR1020040044765A KR100657447B1 (en) 2003-06-17 2004-06-17 Developing apparatus
CN200410048330.4A CN1573602B (en) 2003-06-17 2004-06-17 Developing apparatus

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