JPH0980885A - Developing device and image forming device using the same - Google Patents
Developing device and image forming device using the sameInfo
- Publication number
- JPH0980885A JPH0980885A JP7232817A JP23281795A JPH0980885A JP H0980885 A JPH0980885 A JP H0980885A JP 7232817 A JP7232817 A JP 7232817A JP 23281795 A JP23281795 A JP 23281795A JP H0980885 A JPH0980885 A JP H0980885A
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- Prior art keywords
- developer
- toner
- charging member
- charging
- developing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、現像装置及びそれ
を用いた画像形成装置に係り、特に、電子写真複写機、
電子写真プリンタ等に備えられ、静電潜像を現像する現
像装置及びそれを用いた画像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device and an image forming apparatus using the same, and more particularly to an electrophotographic copying machine,
The present invention relates to a developing device provided in an electrophotographic printer or the like for developing an electrostatic latent image and an image forming apparatus using the developing device.
【０００２】電子写真複写機、電子写真プリンタ等で
は、静電潜像が転写された静電像保持体に現像装置によ
り現像剤を供給し、静電像保持体に印画紙を対向させ静
電保持体に供給された現像剤を印画紙に転写することに
より画像の印刷を行っていた。このとき、静電像保持体
に現像剤を供給する現像装置では、静電像保持体に近接
して設けられた現像剤担持体に現像剤の均一な薄層を形
成し、現像剤担持体の薄層から現像剤を静電像保持体に
供給していた。In an electrophotographic copying machine, an electrophotographic printer, etc., a developing device supplies a developer to an electrostatic image carrier to which an electrostatic latent image has been transferred, and a photographic paper is made to face the electrostatic image carrier so as to be electrostatically charged. An image is printed by transferring the developer supplied to the holder to a printing paper. At this time, in the developing device that supplies the developer to the electrostatic image holding member, a uniform thin layer of the developer is formed on the developer holding member provided in the vicinity of the electrostatic image holding member. The developer was supplied to the electrostatic image carrier from a thin layer of.
【０００３】このような現像装置では、一成分系のトナ
ー、即ち、キャリア粒子を含まない、トナーのみで構成
される現像剤を使ったものが多く、良好な印字を得るた
めには現像剤担持体上に形成する現像剤の薄層が均一で
あり、かつ、ムラなく帯電していることが重要であっ
た。Most of such developing devices use a one-component toner, that is, a developer which does not contain carrier particles and is composed of only toner. In order to obtain good printing, the developer is carried. It was important that the thin layer of the developer formed on the body be uniform and charged uniformly.
【０００４】[0004]
【従来の技術】図４に従来の画像形成装置の一例の構成
図を示す。画像形成装置３１は、静電像保持体に相当し
形成しようとする画像に応じた静電潜像が形成される感
光ドラム３２、感光ドラム３２を帯電させるための帯電
器３３、帯電器３３により帯電された感光ドラム３２に
形成しようとする画像に応じたレーザー光を照射し静電
潜像を形成する光学系３４、感光ドラム３４に形成され
た静電潜像にトナー３５を供給し静電潜像を現像する現
像装置３６、感光ドラム３２に静電潜像に応じて供給さ
れたトナー３５を印画紙３７に転写する転写器３８、転
写器３８により印画紙３７に転写されたトナー３５を印
画紙３７に定着させる定着器３９、印画紙３７へのトナ
ー３５の転写後感光ドラム３２に付着した不要なトナー
３５を除去するクリーナ４０より構成される。2. Description of the Related Art FIG. 4 is a block diagram showing an example of a conventional image forming apparatus. The image forming apparatus 31 includes a photosensitive drum 32 on which an electrostatic latent image corresponding to an image to be formed is formed, which corresponds to an electrostatic image carrier, a charger 33 for charging the photosensitive drum 32, and a charger 33. An optical system 34 that irradiates a charged photosensitive drum 32 with a laser beam according to an image to be formed to form an electrostatic latent image, and supplies toner 35 to the electrostatic latent image formed on the photosensitive drum 34 to electrostatically charge the electrostatic latent image. The developing device 36 for developing the latent image, the transfer device 38 for transferring the toner 35 supplied to the photosensitive drum 32 according to the electrostatic latent image to the photographic paper 37, and the toner 35 transferred to the photographic paper 37 by the transfer device 38 It is composed of a fixing device 39 for fixing the photographic paper 37, and a cleaner 40 for removing the unnecessary toner 35 adhering to the photosensitive drum 32 after transferring the toner 35 to the photographic paper 37.
【０００５】現像装置３６は、感光ドラム３４に対向し
て設けられ、トナー３５を感光ドラム３４に供給する。
図５に従来の現像装置の一例の構成図を示す。現像装置
３６は、トナー３５を収容するトナーホッパー４１、ト
ナー３５を攪拌するパドルローラ４２、トナー３５を感
光ドラム３２に供給する現像ローラ４２、現像ローラ４
２と接触してトナー３５に電荷を与えるトナー供給ロー
ラ４３、現像ローラ４２に付着したトナー３５を均一に
するドクターブレード４４、現像ローラ４２、トナー供
給ローラ４３、ドクターブレード４４に電圧を印加する
電源４５〜４７より構成される。The developing device 36 is provided so as to face the photosensitive drum 34, and supplies the toner 35 to the photosensitive drum 34.
FIG. 5 shows a block diagram of an example of a conventional developing device. The developing device 36 includes a toner hopper 41 that stores the toner 35, a paddle roller 42 that agitates the toner 35, a developing roller 42 that supplies the toner 35 to the photosensitive drum 32, and a developing roller 4.
2. A toner supply roller 43 that contacts the toner 35 to give an electric charge to the toner 35, a doctor blade 44 that makes the toner 35 adhered to the developing roller 42 uniform, a developing roller 42, a toner supply roller 43, and a power source that applies a voltage to the doctor blade 44. It is composed of 45 to 47.
【０００６】従来の現像装置３６は、現像ローラ３２と
トナー供給ローラ４３とを互いに接触させてながら互い
に逆方向に回転させることによりトナー３５を擦りトナ
ー３５に電荷を与える構成であった。The conventional developing device 36 has a structure in which the developing roller 32 and the toner supplying roller 43 are in contact with each other and are rotated in opposite directions to rub the toner 35 to give an electric charge to the toner 35.
【０００７】[0007]
【発明が解決しようとする課題】しかるに、従来の現像
装置は、現像ローラとトナー供給ローラとを互いに接触
させてながら互いに逆方向に回転させることによりトナ
ーを擦りトナーに電荷を与える構成であるため、現像ロ
ーラとトナー供給ローラとが接触しながら互いに逆方向
に回転することから現像ローラ及びトナー供給ローラの
回転にムラが生じてしまう。現像ローラ及びトナー供給
ローラの回転ムラは、トナーの帯電に影響し現像ローラ
に付着するトナーの量にムラを生じさせる。このため、
感光ドラムに付着するトナーの量も感光ドラムの回転位
置に応じてムラになるので感光ドラムから転写された印
刷結果にも回転ムラに応じた縞状の濃度ムラが生じ、印
刷の品質を低下させていた。However, in the conventional developing device, the developing roller and the toner supplying roller are in contact with each other and are rotated in the opposite directions, so that the toner is rubbed to give an electric charge to the toner. Since the developing roller and the toner supplying roller rotate in the opposite directions while making contact with each other, unevenness occurs in the rotation of the developing roller and the toner supplying roller. The uneven rotation of the developing roller and the toner supply roller affects the charging of the toner and causes unevenness in the amount of toner attached to the developing roller. For this reason,
The amount of toner adhering to the photosensitive drum also becomes uneven depending on the rotation position of the photosensitive drum, so the print result transferred from the photosensitive drum also has stripe-shaped density unevenness corresponding to the uneven rotation, which deteriorates the print quality. Was there.
【０００８】また、現像ローラ及びトナー供給ローラの
回転ムラを低減するために、現像ローラ及びトナー供給
ローラを回転させるモータに回転トルクの高いモータを
用いることも考えられるが、モータは回転トルクが高い
ほど高価で、大型化してしまうため、コスト低減、小型
化を困難にするという問題点が生じてしまう。In order to reduce the uneven rotation of the developing roller and the toner supplying roller, it is possible to use a motor having a high rotating torque as a motor for rotating the developing roller and the toner supplying roller, but the motor has a high rotating torque. Since it is so expensive and large in size, there arises a problem that it is difficult to reduce the cost and reduce the size.
【０００９】本発明は、上記の点に鑑みてなされたもの
で、コストの上昇や装置の大型化を伴うことなく印刷品
質を向上させることができる現像装置及びそれを用いた
画像形成装置を提供することを目的とする。The present invention has been made in view of the above points, and provides a developing device and an image forming apparatus using the same which can improve print quality without increasing cost and increasing the size of the device. The purpose is to do.
【００１０】[0010]
【課題を解決するための手段】本発明の請求項１は、現
像剤を静電潜像に供給する現像剤担持体と、該現像剤を
該現像剤担持体に供給する現像剤供給部材とを具備して
なる現像装置において、前記現像剤供給部材と接触し前
記現像剤供給部材とともに前記現像剤を帯電させる第１
帯電部材を設け、前記現像剤担持体と前記現像剤供給部
材とを互いに離間させたことを特徴とする。According to a first aspect of the present invention, a developer carrying member for supplying a developer to an electrostatic latent image and a developer supplying member for supplying the developer to the developer carrying member are provided. A developing device comprising: a first contacting member for charging the developer together with the developer supplying member.
A charging member is provided, and the developer carrying member and the developer supplying member are separated from each other.
【００１１】請求項１によれば、第１帯電部材を現像剤
供給部材に接触させることにより現像剤供給部材の回転
により第１帯電部材と現像剤供給部材とが擦れ、第１帯
電部材と現像剤供給部材との間に供給された現像剤が擦
れ合い、現像剤を帯電させることができる。このため、
現像剤担持体と現像剤供給部材とを互いに離間させても
現像剤を現像剤担持体に付着させることができ、現像剤
担持体及び現像剤供給部材の回転にムラが生じるにくい
ため、現像剤担持体に付着する現像剤がムラになりにく
く、したがって、現像剤の静電潜像への供給を均一に行
え、静電潜像の現像にムラが生じにくくなる。これによ
り、静電潜像の現像が均一に行え、静電潜像により再現
される画像の品質を向上できる。According to the first aspect, when the first charging member is brought into contact with the developer supplying member, the rotation of the developer supplying member rubs the first charging member and the developer supplying member, and the first charging member and the developing member are rubbed. The developer supplied to the agent supply member rubs against each other, and the developer can be charged. For this reason,
Even if the developer carrying member and the developer supplying member are separated from each other, the developer can be attached to the developer carrying member, and the rotation of the developer carrying member and the developer supplying member is less likely to occur. The developer attached to the carrier is less likely to be uneven, and therefore, the developer can be uniformly supplied to the electrostatic latent image, and uneven development of the electrostatic latent image is less likely to occur. Thereby, the electrostatic latent image can be uniformly developed, and the quality of the image reproduced by the electrostatic latent image can be improved.
【００１２】請求項２は、前記第１の帯電部材がシート
状であることを特徴とする。請求項２によれば、第１の
帯電部材をシート状にすることにより第１の帯電部材の
占めるスペースを最小限にできるため、装置を小型に構
成できる。請求項３は、前記第１の帯電部材が導電性材
料で形成されたことを特徴とする。According to a second aspect of the present invention, the first charging member has a sheet shape. According to the second aspect, since the space occupied by the first charging member can be minimized by forming the first charging member into a sheet shape, the device can be downsized. A third aspect of the invention is characterized in that the first charging member is made of a conductive material.
【００１３】請求項３によれば、第１の帯電部材を導電
性材料で構成することにより第１の帯電部材に電圧を印
加できるため、第１の帯電部材から現像剤に対して電荷
を注入できる現像剤の帯電を効率よく行え、第１の帯電
部材と現像剤供給部材との接触圧を低減でき、現像剤供
給部材の回転ムラを低減できるので、現像剤担持体への
現像剤の供給を均一に行え、静電潜像の現像を均一に行
える。According to the third aspect, since the voltage can be applied to the first charging member by forming the first charging member with the conductive material, the charge is injected from the first charging member to the developer. The developer can be efficiently charged, the contact pressure between the first charging member and the developer supply member can be reduced, and the uneven rotation of the developer supply member can be reduced. Therefore, the developer can be supplied to the developer carrier. Can be uniformly performed, and the electrostatic latent image can be uniformly developed.
【００１４】請求項４は、前記第１の帯電部材が弾性体
で形成されたことを特徴とする。請求項４によれば、第
１の帯電部材を弾性体で構成することにより第１の帯電
部材と現像剤との滑りを軽減でき、現像剤を第１の帯電
部材と現像剤供給部材との間に保持できるため、現像剤
を第１の帯電部材と現像剤供給部材とで確実に摩擦帯電
させることができ、現像剤の帯電を効率よく行え、第１
の帯電部材と現像剤供給部材との接触圧を低減でき、現
像剤供給部材の回転ムラを低減できるので、現像剤担持
体への現像剤の供給を均一に行え、静電潜像の現像を均
一に行える。According to a fourth aspect of the present invention, the first charging member is formed of an elastic body. According to the fourth aspect, by forming the first charging member with an elastic body, slippage between the first charging member and the developer can be reduced, and the developer can be separated from the first charging member and the developer supply member. Since the developer can be held between them, the developer can be surely frictionally charged by the first charging member and the developer supplying member, and the developer can be efficiently charged.
Since the contact pressure between the charging member and the developer supply member can be reduced and the uneven rotation of the developer supply member can be reduced, the developer can be uniformly supplied to the developer carrier, and the electrostatic latent image can be developed. Can be done uniformly.
【００１５】請求項５は、第１の帯電部材が前記現像剤
に比べて仕事関数の小さい材料で構成されたことを特徴
とする。請求項５によれば、第１の帯電部材を現像剤に
比べて仕事関数の小さい材料で構成することにより、現
像剤を効率よく帯電させることができる。According to a fifth aspect of the invention, the first charging member is made of a material having a work function smaller than that of the developer. According to the fifth aspect, the developer can be efficiently charged by forming the first charging member with a material having a work function smaller than that of the developer.
【００１６】請求項６は、前記現像剤担持体と接触し前
記現像剤担持体に供給される現像剤を帯電させる第２の
帯電部材とを有することを特徴とする。請求項６によれ
ば、第２帯電部材を現像剤担持体に接触させることによ
り現像剤担持体の回転により第２帯電部材と現像剤担持
体とが擦れ、第２帯電部材と現像剤担持体との間に供給
された現像剤が擦れ合い、現像剤を帯電させることがで
きる。このため、現像剤を現像剤担持体に効率よく付着
させることができ、現像剤担持体に係る回転負荷を低減
でき現像剤担持体に回転にムラが生じるにくいため、現
像剤担持体に付着する現像剤がムラになりにくく、した
がって、現像剤の静電潜像への供給を均一に行え、静電
潜像の現像にムラが生じにくくなる。これにより、静電
潜像の現像が均一に行え、静電潜像により再現される画
像の品質を向上できる。According to a sixth aspect of the present invention, there is provided a second charging member which is in contact with the developer carrier and charges the developer supplied to the developer carrier. According to claim 6, by bringing the second charging member into contact with the developer carrying member, the rotation of the developer carrying member rubs the second charging member and the developer carrying member, and the second charging member and the developer carrying member. The developer supplied between the developer and the toner can be rubbed against each other to charge the developer. For this reason, the developer can be efficiently attached to the developer carrier, the rotational load on the developer carrier can be reduced, and the developer carrier is less likely to rotate unevenly. Therefore, the developer can be attached to the developer carrier. The developer is less likely to be uneven, so that the developer can be uniformly supplied to the electrostatic latent image, and unevenness is less likely to occur in the development of the electrostatic latent image. Thereby, the electrostatic latent image can be uniformly developed, and the quality of the image reproduced by the electrostatic latent image can be improved.
【００１７】請求項７は、前記第２の帯電部材がシート
状であることを特徴とする。請求項７によれば、第２の
帯電部材をシート状にすることにより第２の帯電部材の
占めるスペースを最小限にできるため、装置を小型に構
成できる。請求項８は、前記第２の帯電部材が導電性材
料で形成されたことを特徴とする。According to a seventh aspect of the present invention, the second charging member has a sheet shape. According to the seventh aspect, since the space occupied by the second charging member can be minimized by forming the second charging member into a sheet shape, the device can be downsized. According to an eighth aspect of the present invention, the second charging member is made of a conductive material.
【００１８】請求項８によれば、第２の帯電部材を導電
性材料で構成することにより第２の帯電部材に電圧を印
加できるため、第２の帯電部材から現像剤に対して電荷
を注入できる現像剤の帯電を効率よく行え、第２の帯電
部材と現像剤担持体との接触圧を低減でき、現像剤担持
体の回転ムラを低減できるので、現像剤担持体への現像
剤の供給を均一に行え、静電潜像の現像を均一に行え
る。According to the eighth aspect, since the voltage can be applied to the second charging member by forming the second charging member with the conductive material, the charge is injected from the second charging member to the developer. The developer can be efficiently charged, the contact pressure between the second charging member and the developer carrier can be reduced, and the uneven rotation of the developer carrier can be reduced. Therefore, the developer can be supplied to the developer carrier. Can be uniformly performed, and the electrostatic latent image can be uniformly developed.
【００１９】請求項９は、前記第２の帯電部材が弾性体
で形成されたことを特徴とする。請求項９によれば、第
２の帯電部材を弾性体で構成することにより第２の帯電
部材と現像剤との滑りを軽減でき、現像剤を第２の帯電
部材と現像剤担持体との間に保持できるため、現像剤を
第２の帯電部材と現像剤担持体とで確実に摩擦帯電させ
ることができ、現像剤の帯電を効率よく行え、第２の帯
電部材と現像剤担持体との接触圧を低減でき、現像剤担
持体の回転ムラを低減できるので、現像剤担持体への現
像剤の付着を均一に行え、静電潜像の現像を均一に行え
る。According to a ninth aspect of the present invention, the second charging member is formed of an elastic body. According to claim 9, slippage between the second charging member and the developer can be reduced by forming the second charging member with an elastic body, and the developer can be separated from the second charging member and the developer carrier. Since the developer can be held between them, the developer can be surely triboelectrically charged by the second charging member and the developer carrying member, the developer can be efficiently charged, and the second charging member and the developer carrying member can be charged. Since the contact pressure can be reduced and the uneven rotation of the developer carrier can be reduced, the developer can be uniformly attached to the developer carrier and the electrostatic latent image can be uniformly developed.
【００２０】請求項１０は、第２の帯電部材が前記現像
剤に比べて仕事関数の小さい材料で構成されたことを特
徴とする。請求項１０によれば、第２の帯電部材を現像
剤に比べて仕事関数の小さい材料で構成することによ
り、現像剤を効率よく帯電させることができる。A tenth aspect of the present invention is characterized in that the second charging member is made of a material having a work function smaller than that of the developer. According to the tenth aspect, the developer can be efficiently charged by configuring the second charging member with a material having a work function smaller than that of the developer.
【００２１】請求項１１は、前記第１の帯電部材と前記
第２の帯電部材とが、一体に形成されたことを特徴とす
る。請求項１１によれば、第１の帯電部材と第２の帯電
部材とを一体に形成することにより構成部品点数を低減
できる。The eleventh aspect of the invention is characterized in that the first charging member and the second charging member are integrally formed. According to the eleventh aspect, the number of constituent parts can be reduced by integrally forming the first charging member and the second charging member.
【００２２】請求項１２は、請求項１乃至１１のいずれ
か一項記載の現像装置を用い前記現像剤担持体に供給さ
れた現像剤により静電潜像を現像し、静電潜像に応じた
画像を形成することを特徴とする。請求項１２によれ
ば、静電潜像に現像剤を均一に供給できるため、現像さ
れた画像にムラが生じることがなく、この現像画像によ
って形成される画像にもムラが生じないため、形成画像
の画質を向上させることができる。According to a twelfth aspect of the present invention, the electrostatic latent image is developed with the developer supplied to the developer carrying member by using the developing device according to any one of the first to eleventh aspects, and the electrostatic latent image is transferred according to the electrostatic latent image. It is characterized by forming an image. According to the twelfth aspect, since the developer can be uniformly supplied to the electrostatic latent image, unevenness does not occur in the developed image, and the image formed by this developed image does not cause unevenness. The image quality of the image can be improved.
【００２３】請求項１３は、前記現像剤担持体の位置を
前記現像剤供給部材の位置より低い位置となるように現
像装置を収容することを特徴とする。請求項１３によれ
ば、現像剤担持体の位置を現像剤供給部材の位置より低
い位置となるように現像装置を収容することにより、現
像剤を現像剤供給部材より現像剤担持体に向かって自然
落下させることができるため、現像剤の現像剤担持体へ
の供給を効率的に行うことができる。A thirteenth aspect of the invention is characterized in that the developing device is housed such that the position of the developer carrying member is lower than the position of the developer supplying member. According to the thirteenth aspect, by housing the developing device so that the position of the developer carrying member is lower than the position of the developer supplying member, the developer is directed from the developer supplying member toward the developer carrying member. Since it can be naturally dropped, the developer can be efficiently supplied to the developer carrier.
【００２４】請求項１４は、前記第１の帯電部材と前記
現像剤供給部材に電位差を与える第１の電位差供給手段
を有することを特徴とする。請求項１４によれば、第１
の電位差供給手段により第１の帯電部材と現像剤供給部
材との間に電位差を与えることにより現像剤への電荷注
入を効率よく行えるため、第１の帯電部材と現像剤供給
部材との接触圧を低減でき、現像剤供給部材の回転ムラ
を低減できるので、現像剤担持体への現像剤の供給を均
一に行え、静電潜像の現像を均一に行える。According to a fourteenth aspect, there is provided a first potential difference supplying means for applying a potential difference to the first charging member and the developer supplying member. According to claim 14, the first
Since the electric potential difference is supplied between the first charging member and the developer supplying member by the electric potential difference supplying means, the charge injection into the developer can be efficiently performed, so that the contact pressure between the first charging member and the developer supplying member is increased. And the uneven rotation of the developer supply member can be reduced, so that the developer can be uniformly supplied to the developer carrier and the electrostatic latent image can be uniformly developed.
【００２５】請求項１５は、前記第２の帯電部材と前記
現像剤供給部材に電位差を与える第２の電位差供給手段
を有することを特徴とする。請求項１５によれば、第２
の電位差供給手段により第２の帯電部材と現像剤担持体
との間に電位差を与えることにより現像剤への電荷注入
を効率よく行えるため、第２の帯電部材と現像剤担持体
との接触圧を低減でき、現像剤担持体の回転ムラを低減
できるので、現像剤担持体への現像剤の付着を均一に行
え、静電潜像の現像を均一に行える。According to a fifteenth aspect of the present invention, there is provided a second potential difference supply means for providing a potential difference between the second charging member and the developer supply member. According to claim 15, the second
Since the electric potential difference is supplied between the second charging member and the developer carrying member by the electric potential difference supplying means, the electric charge can be efficiently injected into the developer, so that the contact pressure between the second charging member and the developer carrying member is increased. And the uneven rotation of the developer carrier can be reduced, so that the developer can be uniformly attached to the developer carrier and the electrostatic latent image can be uniformly developed.
【００２６】[0026]
【発明の実施の形態】図１に本発明の一実施例の構成図
を示す。画像形成装置１は、静電像保持体に相当し形成
しようとする画像に応じた静電潜像が形成される感光ド
ラム２、感光ドラム２を帯電させるための帯電器３、帯
電器３により帯電された感光ドラム２に形成しようとす
る画像に応じたレーザー光Ｌを照射し静電潜像を形成す
る光学系４、感光ドラム２に形成された静電潜像に現像
剤であるトナー５を供給し静電潜像を現像する現像装置
６、感光ドラム２に静電潜像に応じて供給されたトナー
５を印画紙７に転写する転写器８、転写器８により印画
紙７に転写されたトナー５を印画紙７に定着させる定着
器９、印画紙７へのトナー５の転写後感光ドラム２に付
着した不要なトナー５を除去するクリーナ１０、現像装
置６を駆動する駆動装置１１より構成される。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a configuration diagram of an embodiment of the present invention. The image forming apparatus 1 includes a photosensitive drum 2 on which an electrostatic latent image corresponding to an image to be formed is formed, which corresponds to an electrostatic image carrier, a charger 3 for charging the photosensitive drum 2, and a charger 3. An optical system 4 for forming an electrostatic latent image by irradiating the charged photosensitive drum 2 with a laser beam L according to an image to be formed, and a toner 5 as a developer on the electrostatic latent image formed on the photosensitive drum 2. Is supplied to the photosensitive drum 2 to transfer the toner 5 supplied according to the electrostatic latent image to the printing paper 7, and the transfer device 8 transfers the toner 5 to the printing paper 7 A fixing device 9 for fixing the formed toner 5 on the printing paper 7, a cleaner 10 for removing the unnecessary toner 5 adhering to the photosensitive drum 2 after the transfer of the toner 5 onto the printing paper 7, and a driving device 11 for driving the developing device 6. It is composed of
【００２７】感光ドラム２は、円筒状をなし、回転軸２
ａを中心にモータにより回転可能な構成とされている。
感光ドラム２は、画像を形成する場合には、まず、帯電
器３により帯電される。次に、光学系４から感光ドラム
２に形成しようとする画像に応じたレーザー光Ｌが照射
され、感光ドラム２上のレーザー光Ｌが照射された部位
の帯電が消去され、静電気による画像である静電潜像が
形成される。The photosensitive drum 2 has a cylindrical shape and has a rotating shaft 2
The motor is rotatable about a.
When forming an image, the photosensitive drum 2 is first charged by the charger 3. Next, laser light L corresponding to the image to be formed on the photosensitive drum 2 is emitted from the optical system 4, the charging of the portion on the photosensitive drum 2 irradiated with the laser light L is erased, and the image is static electricity. An electrostatic latent image is formed.
【００２８】感光ドラム２が回転し、静電潜像が現像装
置６に対向した位置にくると、感光ドラム２が現像装置
６からトナー５の供給を受ける。トナー５は、例えば、
負荷性磁性体であり、体積抵抗率が１０14Ωcm程度、平
均粒径が、体積平均で８μｍ、ポリエステル樹脂を主成
分とし、無機粉体を０．５パーセント程度外添したもの
で、光ドラム２のレーザー光Ｌが照射され帯電が消去さ
れた部位に供給される。このとき、現像装置６から供給
されるトナー５は帯電されていて、感光ドラム２のレー
ザー光Ｌが照射されず帯電された部位とは互いに反発し
あってトナー５は供給されず、したがって、感光ドラム
２上に形成された静電潜像に対応してトナー５が供給さ
れ、静電潜像が現像される。When the photosensitive drum 2 rotates and the electrostatic latent image comes to a position facing the developing device 6, the photosensitive drum 2 receives the toner 5 from the developing device 6. The toner 5 is, for example,
A loadable magnetic material having a volume resistivity of about 10 14 Ωcm, an average particle diameter of 8 μm on a volume average, polyester resin as a main component, and inorganic powder of about 0.5% added externally. The second laser light L is irradiated and supplied to the site where the charge is erased. At this time, the toner 5 supplied from the developing device 6 is charged, the laser light L of the photosensitive drum 2 is not irradiated, and the charged portion repels each other, and the toner 5 is not supplied. Toner 5 is supplied corresponding to the electrostatic latent image formed on the drum 2, and the electrostatic latent image is developed.
【００２９】静電潜像が現像された感光ドラム２がさら
に回転し、トナー５で現像された画像が転写器８に対向
すると転写器８により感光ドラム２側に付着されたトナ
ー５が転写器８側に吸引され、感光ドラム２と転写器８
との間に供給された印画紙７にトナー５が転写される。
印画紙７は、転写器８により感光ドラム２からトナー５
が転写されると、定着器９に送られる。定着器９では、
送られてきた印画紙７に転写されたトナー５を印画紙７
に定着させる。When the photosensitive drum 2 on which the electrostatic latent image has been developed is further rotated and the image developed with the toner 5 faces the transfer device 8, the toner 5 attached to the photosensitive drum 2 side by the transfer device 8 is transferred to the transfer device 8. 8 to the photosensitive drum 2 and the transfer device 8
The toner 5 is transferred to the photographic printing paper 7 supplied during the period.
The printing paper 7 is transferred from the photosensitive drum 2 to the toner 5 by the transfer device 8.
Is transferred to the fixing device 9. In the fixing device 9,
The toner 5 transferred onto the photographic printing paper 7 is sent to the photographic printing paper 7
Fix it on.
【００３０】また、感光ドラム２は、転写器８で印画紙
７に画像を転写したのちさらに回転を続け転写の済んだ
部位がクリーナ１０に供給される。クリーナ１０は、感
光ドラム２の表面をクリーニングし、感光ドラム２の表
面に残ったトナー５を除去する。The photosensitive drum 2 is further rotated after the image is transferred onto the photographic printing paper 7 by the transfer device 8, and the part after the transfer is supplied to the cleaner 10. The cleaner 10 cleans the surface of the photosensitive drum 2 and removes the toner 5 remaining on the surface of the photosensitive drum 2.
【００３１】図２に本発明の一実施例の現像装置の構成
図を示す。現像装置６は、トナー５を収容するトナーホ
ッパー１２、トナー５を攪拌するパドルローラ１３、現
像剤担持体に相当し、トナー５を感光ドラム２に供給す
る現像ローラ１４、現像剤供給部材に相当し、現像ロー
ラ１４と接触してトナー５に電荷を与えるトナー供給ロ
ーラ１５、現像ローラ１４に付着したトナー５を均一に
するドクターブレード１６、仕切り板１７、第１及び第
２の帯電部材を構成し、トナー５を帯電させる帯電シー
ト１８より構成される。FIG. 2 is a block diagram of a developing device according to an embodiment of the present invention. The developing device 6 corresponds to a toner hopper 12 that stores the toner 5, a paddle roller 13 that agitates the toner 5, a developer carrier, and a developing roller 14 that supplies the toner 5 to the photosensitive drum 2 and a developer supply member. Then, a toner supply roller 15 that contacts the developing roller 14 and applies an electric charge to the toner 5, a doctor blade 16 that evenly disperses the toner 5 attached to the developing roller 14, a partition plate 17, and first and second charging members are configured. Then, it is composed of a charging sheet 18 for charging the toner 5.
【００３２】トナーホッパー１２は、トナー５を収容す
る匡体で、匡体内部にはトナー５を適量ずつ均一に供給
するための現像ローラ１４、トナー供給ローラ１５、ド
クターブレード１６、帯電シート１８が収容されてい
る。トナーホッパー１２は、開口部１９が形成されてい
て、この開口部１９からは感光ドラム２に対向して設置
され、トナー５を感光ドラム２に供給する現像ローラ１
４が露出される。The toner hopper 12 is an enclosure for accommodating the toner 5. Inside the enclosure, there are a developing roller 14, a toner supply roller 15, a doctor blade 16, and a charging sheet 18 for uniformly supplying the toner 5 in appropriate amounts. It is housed. The toner hopper 12 is provided with an opening 19, and the developing roller 1 is provided so as to face the photosensitive drum 2 through the opening 19 and supplies the toner 5 to the photosensitive drum 2.
4 is exposed.
【００３３】トナーパドラー１３は、トナーホッパー１
２のトナー５の収容部分に回転自在に保持されており、
駆動装置１１に内蔵されたモータにより回転し、トナー
５が固まりにならないようにトナー５を攪拌する。現像
ローラ１４は、トナーホッパー１２に回転軸１４ａを中
心に回転自在に保持される。回転軸１４ａは、画像形成
装置１への装着時に駆動装置１１を構成するモータと結
合され、現像ローラ１４を矢印Ａ方向に回転させる。The toner paddler 13 is a toner hopper 1.
It is rotatably held in the accommodating portion of the second toner 5,
The toner is rotated by a motor built in the driving device 11, and the toner 5 is agitated so that the toner 5 does not solidify. The developing roller 14 is held by the toner hopper 12 so as to be rotatable around a rotation shaft 14a. The rotating shaft 14a is coupled to a motor that constitutes the driving device 11 when mounted on the image forming apparatus 1, and rotates the developing roller 14 in the arrow A direction.
【００３４】現像ローラ１４の表面部１４ｂはウレタン
ゴム、シリコンゴム、ＮＢＲ（Nitrile rubber; ニトリ
ルゴム）等の材料に導電性を付与したもので、好ましく
は、体積抵抗率が１０8 Ωcm程度あるとよい。また、現
像ローラ１４には、画像形成装置１への装着時に駆動装
置１１を構成する電源２０から電圧が印加される。この
とき、現像ドラム１４に電源２０から印加される電圧Ｖ
１は、感光ドラム２上に形成される静電潜像のトナー５
が供給される画像部とそれ以外の背景部との間とは逆方
向の電界となるような電圧、例えば、画像部が−１００
Ｖ程度で、背景部が−６００Ｖ程度の場合、−３００Ｖ
程度とされる。The surface portion 14b of the developing roller 14 is made of a material such as urethane rubber, silicon rubber, NBR (Nitrile rubber) having conductivity, and preferably has a volume resistivity of about 10 8 Ωcm. Good. Further, a voltage is applied to the developing roller 14 from a power source 20 which constitutes the driving device 11 when the developing roller 14 is mounted on the image forming apparatus 1. At this time, the voltage V applied from the power source 20 to the developing drum 14
1 is toner 5 of the electrostatic latent image formed on the photosensitive drum 2.
Is supplied to the image portion and the background portion other than that, a voltage that creates an electric field in the opposite direction, for example, the image portion is -100.
V, -300V when the background is about -600V
Degree.
【００３５】現像ローラ１４には、トナーホッパー１２
内部側でドクターブレード１６が接触している。ドクタ
ーブレード１６は、現像ローラ１４に接触して、現像ロ
ーラ１４に付着したトナー５を均一な薄層上に成形す
る。ドクターブレード１６には、駆動装置１１を構成す
る電源２３から電圧Ｖ４が印加されいる。The developing roller 14 includes a toner hopper 12
The doctor blade 16 is in contact with the inside. The doctor blade 16 contacts the developing roller 14 to form the toner 5 attached to the developing roller 14 on a uniform thin layer. A voltage V4 is applied to the doctor blade 16 from a power source 23 that constitutes the driving device 11.
【００３６】また、トナーホッパー１２内部において、
現像ローラ１４とトナー５とは仕切り板１７及びトナー
供給ローラ１５により隔離されており、現像ローラ１４
にはトナー供給ローラ１５により適量のトナー５が供給
される構成とされている。トナー供給ローラ１５は、現
像ローラ１４に対して平行に設けられ、トナーホッパー
１２内に回転軸１５ａを中心として回転自在に保持され
ている。回転軸１５ａは、画像形成装置１への装着時に
駆動装置１１を構成するモータと結合され、トナー供給
ローラ１５を矢印Ｂ方向に回転させる。Further, inside the toner hopper 12,
The developing roller 14 and the toner 5 are separated from each other by the partition plate 17 and the toner supply roller 15.
The toner supply roller 15 supplies a proper amount of toner 5 to the paper. The toner supply roller 15 is provided in parallel with the developing roller 14, and is rotatably held in the toner hopper 12 about a rotation shaft 15a. The rotating shaft 15a is coupled to a motor that constitutes the driving device 11 when mounted on the image forming apparatus 1, and rotates the toner supply roller 15 in the arrow B direction.
【００３７】トナー供給ローラ１５の表面部１５ｂは、
スポンジ材に導電性を付与したものより構成される。ま
た、トナー供給ローラ１５にも、現像ローラ１４と同様
に画像形成装置１への装着時に駆動装置１１を構成する
電源２１から電圧が印加される。The surface portion 15b of the toner supply roller 15 is
It is composed of a sponge material with conductivity. Further, like the developing roller 14, a voltage is applied to the toner supply roller 15 from the power supply 21 that constitutes the driving device 11 when the toner supply roller 15 is attached to the image forming apparatus 1.
【００３８】帯電シート１８は、現像ローラ１４及びト
ナー供給ローラ１５の下部とトナーホッパー１２の底面
との間に設けられ、トナー５を帯電させる。帯電シート
１８は、ゴム、スポンジ等の弾性部材に導電性を付与し
た材料、あるいは、金属などの導電性を有する材料より
構成される。また、帯電シート１８の厚さは、トナーホ
ッパー１２の底面に接着され、現像ローラ１４及びトナ
ー供給ローラ１５の表面に接触あるいは僅かに離間する
程度の厚さに設定されている。また、帯電シート１８に
も、トナー供給ローラ１５、現像ローラ１４と同様に画
像形成装置１への装着時に駆動装置１１を構成する電源
２２から電圧Ｖ３が印加される。The charging sheet 18 is provided between the lower portions of the developing roller 14 and the toner supply roller 15 and the bottom surface of the toner hopper 12, and charges the toner 5. The charging sheet 18 is made of an elastic material such as rubber or sponge, which is made conductive, or a conductive material such as metal. Further, the thickness of the charging sheet 18 is set to such a thickness that it is adhered to the bottom surface of the toner hopper 12 and comes into contact with or slightly separates from the surfaces of the developing roller 14 and the toner supply roller 15. Further, the voltage V3 is applied to the charging sheet 18 from the power source 22 that constitutes the driving device 11 when the charging sheet 18 is mounted on the image forming apparatus 1 like the toner supply roller 15 and the developing roller 14.
【００３９】帯電シート１８に印加する電圧Ｖ３は、好
ましくはトナー供給ローラ１５に電源２１より印加され
る電圧Ｖ２より低い電圧で、且つ、電圧Ｖ２より−１０
０Ｖ以上低く設定するとよい。また、トナー５の材料と
帯電シート１８の材料とは、トナー５が負に帯電する場
合には、（トナー５の仕事関数）＞（帯電シート１８の
仕事関数）となる材料に設定し、トナー５が正に帯電す
る材料の場合には、（トナー５の仕事関数）＜（帯電シ
ート１８の仕事関数）となる材料に設定する。The voltage V3 applied to the charging sheet 18 is preferably lower than the voltage V2 applied from the power source 21 to the toner supply roller 15 and is -10 less than the voltage V2.
It is better to set it lower than 0V. When the toner 5 is negatively charged, the material of the toner 5 and the material of the charging sheet 18 are set such that (work function of toner 5)> (work function of charging sheet 18). When 5 is a material that is positively charged, it is set to a material such that (work function of toner 5) <(work function of charging sheet 18).
【００４０】ここで、仕事関数とは、物質から電子を取
り出すためのエネルギー示しており、仕事関数が小さい
程電子を出しやすく、大きいほ程電子を出しにくい。接
触する物質の仕事関数の違いによって物質に摩擦帯電が
生じ、接触する物質間の仕事関数の差が小さい程摩擦帯
電が生じにくくなる。Here, the work function refers to energy for taking out electrons from a substance. The smaller the work function is, the easier it is to emit electrons, and the larger the work function is, the less likely it is to emit electrons. Triboelectrification occurs in the substances due to the difference in work function between the substances that come into contact with each other, and triboelectrification becomes less likely to occur as the difference in work function between the substances in contact becomes smaller.
【００４１】現像装置６は、画像形成装置１に装着した
際に図１に示されるように現像ローラ１４の位置に比べ
てトナー供給ローラ１５の位置が高い位置となるように
装着され、トナー５が現像ローラ１４に供給されやすい
構成とされている。なお、現像ローラ１４の位置に比べ
てトナー供給ローラ１５の位置が高い位置となるように
装着しない場合でも、トナー供給ローラ１５の回転によ
りトナー５は現像ローラ１４側に供給することは可能で
ある。When the developing device 6 is mounted on the image forming apparatus 1, the developing device 6 is mounted such that the position of the toner supply roller 15 is higher than the position of the developing roller 14 as shown in FIG. Is easily supplied to the developing roller 14. Even if the toner supply roller 15 is not mounted at a position higher than the position of the developing roller 14, the toner 5 can be supplied to the developing roller 14 side by the rotation of the toner supply roller 15. .
【００４２】次に、トナー５の感光ドラム２への供給動
作について説明する。現像装置６は、画像形成装置１に
装着され、画像の印刷を行うときには、駆動装置１１に
より現像ローラ１４が矢印Ａ方向に回転し、トナー供給
ローラ１５が矢印Ｂ方向に回転する。Next, the operation of supplying the toner 5 to the photosensitive drum 2 will be described. The developing device 6 is attached to the image forming apparatus 1, and when printing an image, the developing device 14 rotates the developing roller 14 in the arrow A direction and the toner supply roller 15 rotates in the arrow B direction by the driving device 11.
【００４３】まず、トナー供給ローラ１５の回転により
トナー５がトナー供給ローラ１５と帯電シート１８との
間に引き込まれ、トナー５に摩擦帯電が生じる。このと
き、帯電シート１８は弾性部材で構成されているため、
トナー５が滑ってしまうことがなく確実に摩擦が行わ
れ、トナー５を確実に、かつ、効率よく摩擦帯電させる
ことができる。First, the toner 5 is drawn between the toner supply roller 15 and the charging sheet 18 by the rotation of the toner supply roller 15, and the toner 5 is frictionally charged. At this time, since the charging sheet 18 is made of an elastic member,
The toner 5 is surely rubbed without slipping, and the toner 5 can be reliably and efficiently triboelectrically charged.
【００４４】また、トナー供給ローラ１５と帯電シート
１８とに電位差を付与することにより、摩擦により帯電
のみならず、帯電シート１８よりトナー５に電位差によ
る電荷の注入を行えるため、トナー５の帯電を効率よく
行える。トナー供給ローラ１５と帯電シート１８との間
に引き込まれ、帯電されたトナー５は、トナー供給ロー
ラ１５の回転により現像ローラ１４側に供給される。現
像ローラ１４側に供給されたトナー５は、トナー供給ロ
ーラ１５より下方に位置する現像ローラ１４側に落下
し、現像ローラ１４に供給される。Further, by applying a potential difference between the toner supply roller 15 and the charging sheet 18, not only charging by friction but also charge injection by the potential difference from the charging sheet 18 to the toner 5 can be performed, so that the toner 5 is charged. Can be done efficiently. The toner 5 charged and drawn between the toner supply roller 15 and the charging sheet 18 is supplied to the developing roller 14 side by the rotation of the toner supply roller 15. The toner 5 supplied to the developing roller 14 side drops to the developing roller 14 side located below the toner supply roller 15 and is supplied to the developing roller 14.
【００４５】現像ローラ１４に供給されたトナー５は、
現像ローラ１４の回転により現像ローラ１４と帯電シー
ト１８との間に引き込まれ、摩擦帯電が生じる。このと
き、帯電シート１８は弾性部材で構成されているため、
トナー供給ローラ１５と同様にトナー５が滑ってしまう
ことがなく確実に摩擦が行われ、トナー５を確実、且
つ、効率よく摩擦帯電させることができる。現像ローラ
１４と帯電シート１８との間で摩擦帯電されたトナー５
は、現像ローラ１４の表面に付着して、現像ローラ１４
の回転により感光ドラム２側に供給される。The toner 5 supplied to the developing roller 14 is
By the rotation of the developing roller 14, the developing roller 14 is drawn between the developing roller 14 and the charging sheet 18, and frictional charging occurs. At this time, since the charging sheet 18 is made of an elastic member,
As with the toner supply roller 15, the toner 5 does not slip, and friction is surely performed, so that the toner 5 can be reliably and efficiently triboelectrically charged. Toner 5 frictionally charged between the developing roller 14 and the charging sheet 18.
Adheres to the surface of the developing roller 14 and
Is supplied to the photosensitive drum 2 side.
【００４６】このとき、本実施例によれば、トナー供給
ローラ１５と現像ローラ１４とは、互いに離間して配置
されており、トナー供給ローラ１５の回転と現像ローラ
１４の回転とが互いに干渉しあって、回転ムラを生じさ
せることがなくなり、現像ローラ１４にトナー５を均一
に付着させることができる。At this time, according to this embodiment, the toner supply roller 15 and the developing roller 14 are arranged apart from each other, and the rotation of the toner supply roller 15 and the rotation of the developing roller 14 interfere with each other. As a result, uneven rotation does not occur, and the toner 5 can be uniformly attached to the developing roller 14.
【００４７】また、トナー供給ローラ１５及び現像ロー
ラ１４と帯電シート１８とに電位差を付与することによ
り、摩擦により帯電のみならず、帯電シート１８よりト
ナー５に電位差による電荷の注入を行え、トナー５の帯
電を効率よく行えるため、トナー供給ローラ１５及び現
像ローラ１４と帯電シート１８との接触圧を低下させる
ことができ、トナー供給ローラ１５及び現像ローラ１４
の回転変動を低減でき、現像ローラ１４へのトナー５の
付着を均一に行えると共に、トナー５が現像ローラ１４
に膜状に張りついてしまうフィルミングを防止できる。Further, by applying a potential difference between the toner supply roller 15 and the developing roller 14 and the charging sheet 18, not only charging by friction but also charge injection from the charging sheet 18 to the toner 5 due to the potential difference can be performed. Can be efficiently charged, so that the contact pressure between the toner supply roller 15 and the developing roller 14 and the charging sheet 18 can be reduced, and the toner supply roller 15 and the developing roller 14 can be charged.
Rotation of the developing roller 14 can be reduced, the toner 5 can be evenly attached to the developing roller 14, and
It is possible to prevent filming that sticks like a film on the surface.
【００４８】図３に本発明の一実施例の現像装置の他の
例の構成図を示す。同図中、図２と同一構成部分には同
一符号を付し、その説明は省略する。本実施例は、帯電
シートをトナー供給ローラ１５と現像ローラ１４とでそ
れぞれ別々に第１の帯電部材に相当する第１の帯電シー
ト２４、及び、第２の帯電部材に相当する第２の帯電シ
ート２５より構成している。第１の帯電シート２４、及
び、第２の帯電シート２５は、帯電シート１８と同様に
ゴム、スポンジ等の弾性部材に導電性を付与した材料、
あるいは、金属などの導電性を有する材料より構成され
る。FIG. 3 is a block diagram of another example of the developing device according to the embodiment of the present invention. 2, the same components as those of FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted. In the present embodiment, the charging sheet is separately provided by the toner supply roller 15 and the developing roller 14, and the first charging sheet 24 corresponding to the first charging member and the second charging sheet corresponding to the second charging member are separately provided. It is composed of a seat 25. Similar to the charging sheet 18, the first charging sheet 24 and the second charging sheet 25 are made of a material such as rubber or sponge made of an elastic member having conductivity.
Alternatively, it is made of a conductive material such as metal.
【００４９】本実施例によれば、トナー供給ローラ１５
と第１の帯電シート２４との間と、現像ローラ１４と第
２の帯電シート２５との間とでそれぞれに電圧を印加で
きる。According to this embodiment, the toner supply roller 15
A voltage can be applied to each of the first charging sheet 24 and the first charging sheet 24 and between the developing roller 14 and the second charging sheet 25.
【００５０】[0050]
【発明の効果】上述の如く、本発明の請求項１によれ
ば、第１帯電部材を現像剤供給部材に接触させることに
より現像剤供給部材の回転により第１帯電部材と現像剤
供給部材とが擦れ、第１帯電部材と現像剤供給部材との
間に供給された現像剤が擦れ合い、現像剤を帯電させる
ことができる。このため、現像剤担持体と現像剤供給部
材とを互いに離間させても現像剤を現像剤担持体に付着
させることができ、現像剤担持体及び現像剤供給部材の
回転にムラが生じるにくいため、現像剤担持体に付着す
る現像剤がムラになりにくく、したがって、現像剤の静
電潜像への供給を均一に行え、静電潜像の現像にムラが
生じにくくなる。これにより、静電潜像の現像が均一に
行え、静電潜像により再現される画像の品質を向上でき
る。As described above, according to claim 1 of the present invention, by contacting the first charging member with the developer supplying member, the developer supplying member is rotated to cause the first charging member and the developer supplying member to rotate. And the developer supplied between the first charging member and the developer supply member rubs against each other, and the developer can be charged. Therefore, even if the developer carrying member and the developer supplying member are separated from each other, the developer can be attached to the developer carrying member, and the rotation of the developer carrying member and the developer supplying member is less likely to be uneven. The developer attached to the developer carrier is less likely to be uneven, and therefore the developer can be uniformly supplied to the electrostatic latent image, and uneven development of the electrostatic latent image is less likely to occur. Thereby, the electrostatic latent image can be uniformly developed, and the quality of the image reproduced by the electrostatic latent image can be improved.
【００５１】請求項２によれば、第１の帯電部材をシー
ト状にすることにより第１の帯電部材の占めるスペース
を最小限にできるため、装置を小型に構成できる等の特
長を有する。請求項３によれば、第１の帯電部材を導電
性材料で構成することにより第１の帯電部材に電圧を印
加できるため、第１の帯電部材から現像剤に対して電荷
を注入できる現像剤の帯電を効率よく行え、したがっ
て、第１の帯電部材と現像剤供給部材との接触圧を低減
でき、現像剤供給部材に回転ムラが生じにくく現像剤担
持体への現像剤の供給を均一化でき、現像剤担持体に付
着する現像剤を均一にできるため、静電潜像に現像剤を
均一に供給でき、形成画像の画質を向上できるなどの特
長を有する。According to the second aspect, since the space occupied by the first charging member can be minimized by forming the first charging member in the form of a sheet, the device can be downsized. According to claim 3, since the voltage can be applied to the first charging member by forming the first charging member with a conductive material, a developer capable of injecting an electric charge from the first charging member into the developer. Can be efficiently charged, and therefore, the contact pressure between the first charging member and the developer supplying member can be reduced, so that the developer supplying member is less likely to have uneven rotation, and the developer can be uniformly supplied to the developer carrier. Since the developer adhered to the developer carrier can be made uniform, the developer can be uniformly supplied to the electrostatic latent image and the image quality of the formed image can be improved.
【００５２】請求項４によれば、第１の帯電部材を弾性
体で構成することにより第１の帯電部材と現像剤との滑
りを軽減でき、現像剤を第１の帯電部材と現像剤供給部
との間に保持できるため、現像剤を第１の帯電部材と現
像剤供給部とで確実に摩擦帯電させることができ、現像
剤の帯電を効率よく行え、第１の帯電部材と現像剤供給
部材との接触圧を低減でき、現像剤供給部材の回転ムラ
を低減できるので、現像剤担持体への現像剤の供給を均
一に行え、静電潜像の現像を均一に行える。According to the fourth aspect, by forming the first charging member with an elastic body, slippage between the first charging member and the developer can be reduced, and the developer can be supplied to the first charging member and the developer. Since it can be held between the first charging member and the developer, the developer can be surely frictionally charged between the first charging member and the developer supply unit, and the developer can be efficiently charged. Since the contact pressure with the supply member can be reduced and the rotation unevenness of the developer supply member can be reduced, the developer can be uniformly supplied to the developer carrier, and the electrostatic latent image can be uniformly developed.
【００５３】請求項５によれば、第１の帯電部材を現像
剤に比べて帯電しにくい仕事関数の材料で構成すること
により、現像剤を効率よく帯電させることができる等の
特長を有する。請求項６によれば、第２帯電部材を現像
剤担持体に接触させることにより現像剤担持体の回転に
より第２帯電部材と現像剤担持体とが擦れ、第２帯電部
材と現像剤担持体との間に供給された現像剤が擦れ合
い、現像剤を帯電させることができる。このため、現像
剤を現像剤担持体に効率よく付着させることができ、現
像剤担持体に係る回転負荷を低減でき現像剤担持体に回
転にムラが生じるにくいため、現像剤担持体に付着する
現像剤がムラになりにくく、したがって、現像剤の静電
潜像への供給を均一に行え、静電潜像の現像にムラが生
じにくくなる。これにより、静電潜像の現像が均一に行
え、静電潜像により再現される画像の品質を向上でき
る。According to the fifth aspect of the present invention, the first charging member is made of a material having a work function that is less likely to be charged than the developer, so that the developer can be charged efficiently. According to claim 6, by bringing the second charging member into contact with the developer carrying member, the rotation of the developer carrying member rubs the second charging member and the developer carrying member, and the second charging member and the developer carrying member. The developer supplied between the developer and the toner can be rubbed against each other to charge the developer. For this reason, the developer can be efficiently attached to the developer carrier, the rotational load on the developer carrier can be reduced, and the developer carrier is less likely to rotate unevenly. Therefore, the developer can be attached to the developer carrier. The developer is less likely to be uneven, so that the developer can be uniformly supplied to the electrostatic latent image, and unevenness is less likely to occur in the development of the electrostatic latent image. Thereby, the electrostatic latent image can be uniformly developed, and the quality of the image reproduced by the electrostatic latent image can be improved.
【００５４】請求項７によれば、第２の帯電部材をシー
ト状にすることにより第２の帯電部材の占めるスペース
を最小限にできるため、装置を小型に構成できる。請求
項８によれば、第２の帯電部材を導電性材料で構成する
ことにより第２の帯電部材に電圧を印加できるため、第
２の帯電部材から現像剤に対して電荷を注入できる現像
剤の帯電を効率よく行え、第２の帯電部材と現像剤担持
体との接触圧を低減でき、現像剤担持体の回転ムラを低
減できるので、現像剤担持体への現像剤の供給を均一に
行え、静電潜像の現像を均一に行える等の特長を有す
る。According to the seventh aspect, since the space occupied by the second charging member can be minimized by forming the second charging member into a sheet shape, the device can be made compact. According to claim 8, since the voltage can be applied to the second charging member by forming the second charging member with the conductive material, the developer capable of injecting the charge from the second charging member into the developer. Can be efficiently charged, the contact pressure between the second charging member and the developer carrier can be reduced, and the uneven rotation of the developer carrier can be reduced, so that the developer can be uniformly supplied to the developer carrier. It can be performed and the electrostatic latent image can be uniformly developed.
【００５５】請求項９によれば、第２の帯電部材を弾性
体で構成することにより第２の帯電部材と現像剤との滑
りを軽減でき、現像剤を第２の帯電部材と現像剤担持体
との間に保持できるため、現像剤を第２の帯電部材と現
像剤担持体とで確実に摩擦帯電させることができ、現像
剤の帯電を効率よく行え、第２の帯電部材と現像剤担持
体との接触圧を低減でき、現像剤担持体の回転ムラを低
減できるので、現像剤担持体への現像剤の付着を均一に
行え、静電潜像の現像を均一に行える等の特長を有す
る。According to the ninth aspect, the second charging member is made of an elastic material so that slippage between the second charging member and the developer can be reduced, and the developer is carried by the second charging member and the developer. Since it can be held between the body and the body, the developer can be reliably frictionally charged by the second charging member and the developer carrying member, the charging of the developer can be efficiently performed, and the second charging member and the developer can be charged. Since the contact pressure with the carrier can be reduced and uneven rotation of the developer carrier can be reduced, the developer can be evenly attached to the developer carrier and the electrostatic latent image can be developed evenly. Have.
【００５６】請求項１０によれば、第２の帯電部材を現
像剤に比べて仕事関数の小さい材料で構成することによ
り、現像剤を効率よく帯電させることができる等の特長
を有する。請求項１１によれば、第１の帯電部材と第２
の帯電部材とを一体に形成することにより構成部品点数
を低減できる等の特長を有する。According to the tenth aspect, since the second charging member is made of a material having a work function smaller than that of the developer, the developer can be charged efficiently. According to claim 11, the first charging member and the second charging member
By integrally forming the charging member of 1), the number of constituent parts can be reduced.
【００５７】請求項１２によれば、静電潜像に現像剤を
均一に供給できるため、現像された画像にムラが生じる
ことがなく、この現像画像によって形成される画像にも
ムラが生じないため、形成画像の画質を向上させること
ができる等の特長を有する。請求項１３によれば、現像
剤担持体の位置を現像剤供給部材の位置より低い位置と
なるように現像装置を収容することにより、現像剤を現
像剤供給部材より現像剤担持体に向かって自然落下させ
ることができるため、現像剤の現像剤担持体への供給を
効率的に行うことができる等の特長を有する。According to the twelfth aspect, since the developer can be uniformly supplied to the electrostatic latent image, unevenness does not occur in the developed image, and unevenness does not occur in the image formed by this developed image. Therefore, it has a feature that the quality of the formed image can be improved. According to the thirteenth aspect, by housing the developing device so that the position of the developer carrying member is lower than the position of the developer supplying member, the developer is directed from the developer supplying member toward the developer carrying member. Since it can be naturally dropped, it has a feature that the developer can be efficiently supplied to the developer carrying member.
【００５８】請求項１４によれば、第１の電位差供給手
段により第１の帯電部材と現像剤供給部材との間に電位
差を与えることにより現像剤への電荷注入を効率よく行
えるため、第１の帯電部材と現像剤供給部材との接触圧
を低減でき、現像剤供給部材の回転ムラを低減できるの
で、現像剤担持体への現像剤の供給を均一に行え、静電
潜像の現像を均一に行え、形成画像の画質を向上できる
等の特長を有する。According to the fourteenth aspect, the charge can be efficiently injected into the developer by providing the potential difference between the first charging member and the developer supplying member by the first potential difference supplying means. Since the contact pressure between the charging member and the developer supply member can be reduced and the uneven rotation of the developer supply member can be reduced, the developer can be uniformly supplied to the developer carrier, and the electrostatic latent image can be developed. It has the advantages that it can be performed uniformly and the quality of the formed image can be improved.
【００５９】請求項１５によれば、第２の電位差供給手
段により第２の帯電部材と現像剤担持体との間に電位差
を与えることにより現像剤への電荷注入を効率よく行え
るため、第２の帯電部材と現像剤担持体との接触圧を低
減でき、現像剤担持体の回転ムラを低減できるので、現
像剤担持体への現像剤の付着を均一に行え、静電潜像の
現像を均一に行え、形成画像の画質を向上できる等の特
長を有する。According to the fifteenth aspect, the electric potential can be efficiently injected into the developer by providing the electric potential difference between the second charging member and the developer carrying member by the second electric potential difference supplying means. The contact pressure between the charging member and the developer carrier can be reduced, and the unevenness of rotation of the developer carrier can be reduced, so that the developer can be uniformly attached to the developer carrier and the electrostatic latent image can be developed. It has the advantages that it can be performed uniformly and the quality of the formed image can be improved.
【図１】本発明の一実施例の構成図である。FIG. 1 is a configuration diagram of an embodiment of the present invention.
【図２】本発明の一実施例の現像装置の構成図である。FIG. 2 is a configuration diagram of a developing device according to an embodiment of the present invention.
【図３】本発明の一実施例の現像装置の変形例の構成図
である。FIG. 3 is a configuration diagram of a modified example of the developing device according to the embodiment of the present invention.
【図４】従来の画像形成装置の一例の構成図である。FIG. 4 is a configuration diagram of an example of a conventional image forming apparatus.
【図５】従来の現像装置の一例の構成図である。FIG. 5 is a configuration diagram of an example of a conventional developing device.
１ 画像形成装置 ２ 感光ドラム ３ 帯電器 ４ 光学系 ５ トナー ６ 現像装置 ７ 印画紙 ８ 転写器 ９ 定着器 １０クリーナ １１駆動装置 １４現像ローラ １５トナー供給ローラ １８帯電シート ２０〜２３ 電源 ２４ 第１の帯電シート ２５ 第２の帯電シート DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Photosensitive drum 3 Charging device 4 Optical system 5 Toner 6 Developing device 7 Printing paper 8 Transfer device 9 Fixing device 10 Cleaner 11 Driving device 14 Developing roller 15 Toner supply roller 18 Charging sheet 20-23 Power supply 24 First Charging sheet 25 Second charging sheet
───────────────────────────────────────────────────── フロントページの続き (72)発明者 滝沢 良美 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内 (72)発明者 真壁 晃 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshimi Takizawa 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, Fujitsu Limited
Claims (15)
体と、該現像剤を該現像剤担持体に供給する現像剤供給
部材とを具備してなる現像装置において、 前記現像剤供給部材と接触し前記現像剤供給部材ととも
に前記現像剤を帯電させる第１帯電部材を設け、 前記現像剤担持体と前記現像剤供給部材とを互いに離間
させたことを特徴とする現像装置。1. A developing device comprising: a developer carrying member for supplying a developer to an electrostatic latent image; and a developer supplying member for supplying the developer to the developer carrying member, wherein: A developing device, comprising: a first charging member that contacts a supply member and charges the developer together with the developer supply member, and separates the developer carrying member and the developer supply member from each other.
ことを特徴とする請求項１記載の現像装置。2. The developing device according to claim 1, wherein the first charging member has a sheet shape.
成されたことを特徴とする請求項１又は２記載の現像装
置。3. The developing device according to claim 1, wherein the first charging member is made of a conductive material.
れたことを特徴とする請求項１乃至３のいずれか一項記
載の現像装置。4. The developing device according to claim 1, wherein the first charging member is formed of an elastic body.
べて帯電しにくい仕事関数の材料で構成されたことを特
徴とする請求項１乃至４のいずれか一項記載の現像装
置。5. The developing device according to claim 1, wherein the first charging member is made of a material having a work function that is less likely to be charged than the developer.
持体に供給される現像剤を帯電させる第２の帯電部材と
を有することを特徴とする請求項１乃至５のいずれか一
項記載の現像装置。6. The second charging member, which is in contact with the developer carrying member and charges the developer supplied to the developer carrying member, according to any one of claims 1 to 5. The developing device described.
ことを特徴とする請求項６記載の現像装置。7. The developing device according to claim 6, wherein the second charging member has a sheet shape.
成されたことを特徴とする請求項６又は７記載の現像装
置。8. The developing device according to claim 6, wherein the second charging member is made of a conductive material.
れたことを特徴とする請求項６乃至８のいずれか一項記
載の現像装置。9. The developing device according to claim 6, wherein the second charging member is formed of an elastic body.
して負に帯電する現像剤を用いたときには前記現像剤の
仕事関数より小さい仕事関数を有する材料で構成される
ことを特徴とする請求項６乃至９のいずれか一項記載の
現像装置。10. The second charging member is made of a material having a work function smaller than that of the developer when a negatively charged developer is used as the developer. Item 10. The developing device according to any one of items 6 to 9.
部材とは、一体に形成されたことを特徴とする請求項６
乃至１０のいずれか一項記載の現像装置。11. The first charging member and the second charging member are integrally formed.
11. The developing device according to claim 10.
により静電潜像を現像し、静電潜像に応じた画像を形成
する請求項１乃至１１のいずれか一項記載の現像装置を
用いた画像形成装置。12. The developing device according to claim 1, wherein the electrostatic latent image is developed by the developer supplied to the developer carrier to form an image corresponding to the electrostatic latent image. Image forming apparatus using.
供給部材の位置より低い位置となるように現像装置を収
容することを特徴とする請求項１２記載の画像形成装
置。13. The image forming apparatus according to claim 12, wherein the developing device is housed such that the position of the developer carrier is lower than the position of the developer supply member.
部材に電位差を与える第１の電位差供給手段を有するこ
とを特徴とする請求項１２又は１３の記載の画像形成装
置。14. The image forming apparatus according to claim 12, further comprising a first potential difference supply unit that applies a potential difference between the first charging member and the developer supply member.
部材に電位差を与える第２の電位差供給手段を有するこ
とを特徴とする請求項１２乃至１４のいずれか一項記載
の画像形成装置。15. The image forming apparatus according to claim 12, further comprising a second potential difference supply unit that applies a potential difference between the second charging member and the developer supply member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7232817A JPH0980885A (en) | 1995-09-11 | 1995-09-11 | Developing device and image forming device using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7232817A JPH0980885A (en) | 1995-09-11 | 1995-09-11 | Developing device and image forming device using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0980885A true JPH0980885A (en) | 1997-03-28 |
Family
ID=16945248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7232817A Pending JPH0980885A (en) | 1995-09-11 | 1995-09-11 | Developing device and image forming device using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0980885A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8229334B2 (en) | 2007-06-29 | 2012-07-24 | Brother Kogyo Kabushiki Kaisha | Developer unit, process device and image forming apparatus |
-
1995
- 1995-09-11 JP JP7232817A patent/JPH0980885A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8229334B2 (en) | 2007-06-29 | 2012-07-24 | Brother Kogyo Kabushiki Kaisha | Developer unit, process device and image forming apparatus |
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