摘要:
An image forming apparatus includes an image bearing member for carrying an electrostatic image, a contact charger for electrically charging the image bearing member while contacting to a surface of the image bearing member, the contact charger forming an oscillating electric field having a frequency of 100-600 Hz; a developer for developing the electrostatic image on the image bearing member with a developer comprising toner and a carrier having a volume resistivity value of 106-1010 &OHgr;.cm, while contacting chains of the carrier to the image bearing member, the developer including a developer carrying member, opposed to the image bearing member, for carrying the developer and electric field forming device for forming an alternating electric filed between the image bearing member and the developer carrying member; wherein the following relationship are satisfied: 5×10−5
摘要:
An image forming apparatus includes an image bearing member; a latent image forming device for forming on the image bearing member a dot distribution electrostatic latent image in accordance with image signals corresponding to an object image; a developing device for developing the latent image formed on the image bearing member by the latent image forming device, in a developing station and by a developer containing toner and magnetic carrier; wherein the developing device includes a developer carrying member for carrying and conveying the developer to the developing station, and a magnetic field generating device provided within the developer carrying member, for forming a magnetic brush of the developer and contacting the magnetic brush to the image bearing member; and wherein a degree .sigma.d (emu/cm.sup.3) of magnetization of the magnetic carrier by a magnetic field by the magnetic field generating means at a peak of a perpendicular magnetic field on the surface of the developer carrying member satisfies the following:if X
摘要:
A developing method includes forming a magnetic field between an image bearing member bearing an electrostatic image and a developer carrying member carrying a developer comprising toner particles and carrier particles; and contacting chains of carrier particles formed on the developer carrying member to the image bearing member; wherein an absolute value of an intensity of a magnetic field in a movement direction of the developer carrying member over the entire portion of the developer carrying member at a position where the carrier is contacted to the image bearing member is positive.
摘要:
A developing method for developing an electrostatic image on an image bearing member with a two-component developer includes the steps of bearing a developer containing toner particles and carrier particles on a developer bearing member to a contact region formed between the developer bearing member and an image bearing member bearing an electrostatic image thereon, and rubbing the image bearing member with the magnetic brush with a contact pressure equal to 0.7 gf/cm.sup.2 or less.
摘要翻译:使用双组分显影剂在图像承载部件上显影静电图像的显影方法包括以下步骤:在显影剂承载部件上承载含有调色剂颗粒和载体颗粒的显影剂到形成在显影剂承载部件和图像之间的接触区域 承载构件,其上具有静电图像,并且用磁刷摩擦图像承载构件,接触压力等于0.7gf / cm 2以下。
摘要:
An image forming apparatus uses a toner wherein when a weight average diameter of the initial toner in a developing device is set to D1, and a weight average diameter of a toner forming an initial toner image on an image bearing member is D2, such that D1≧D2 is satisfied.
摘要:
A developing device includes a developer bearing member for bearing and conveying a developer having a toner and a carrier, a first magnetic pole arranged in the developer bearing member, a second magnetic pole arranged in the developer bearing member, a polarity of the second magnetic pole being opposite to a polarity of the first magnetic pole. The second magnetic pole is adjacent to the first magnetic pole and is arranged on a downstream side of the first magnetic pole in a moving direction of the developer bearing member. A regulating member regulates a layer thickness of the developer borne by the developer bearer. The regulating member is arranged in the vicinity of the second magnetic pole and a concentration detector for detecting a concentration of the toner in the developer.
摘要:
A developing apparatus has a developer bearing member disposed in opposed relationship with an image bearing member bearing an electrostatic image thereon with a gap of 6.times.10.sup.-4 m or less with respect to the image bearing member, and bearing and conveying a developer thereon. The developer bearing member is moved in a direction opposite to the direction of movement of the image bearing member in the portion opposed to the image bearing member, and the developer has a non-magnetic toner and a carrier of which the magnetization rate in a magnetic field of 1000 gauss is equal to or greater than 30 emu/cm.sup.3 and equal to or less than 200 emu/cm.sup.3 and the specific resistance at electric field intensity of 5.times.10.sup.4 V/m is 10.sup.12 .OMEGA.cm or greater. The developing apparatus further has applying means for applying a bias voltage having a vibration component to the developer bearing member. The bias voltage applied to the developer bearing member and the gap between the image bearing member and the developer carrying member satisfy the following relation:2.0.times.10.sup.6 .ltoreq.V/d
摘要翻译:显影装置具有显影剂承载部件,该显影剂承载部件与图像承载部件相对设置,该图像承载部件相对于图像承载部件具有6×10 -4 m或更小的间隔,并且在其上承载和输送显影剂。 显影剂承载构件在与图像承载构件相对的部分中与图像承载构件的移动方向相反的方向移动,并且显影剂具有非磁性调色剂和载体,其磁化速率在磁性 1000高斯的场等于或大于30emu / cm 3且等于或小于200emu / cm 3,并且电场强度为5×10 4 V / m时的电阻率为1012ΩEG/ cm以上。 显影装置还具有用于将具有振动成分的偏置电压施加到显影剂承载部件的施加装置。 施加到显影剂承载部件的偏置电压和图像承载部件和显影剂承载部件之间的间隙满足以下关系:2.0×10 6 V / d <4.0×10 6,其中V:振动的振幅(V) 偏置电压的分量; d:图像承载部件和显影剂承载部件之间的间隙的大小(m)。
摘要:
The present invention relates to an image forming apparatus which has an image bearing member for bearing a latent image, charging device for charging the image bearing member by bringing ears of electrically conductive particles into contact with the image bearing member, developing device for visualizing the latent image formed on the image bearing member as a toner image by using a developer containing toner and carrier after the image bearing member has been charged by the charging device, a permeability of the carriers being different from a permeability of the electrically conductive particles, density control device for controlling density of the developer within the developing device, the density control device detecting a permeability of the developer, comparing a detected signal value based on the detected result with a reference value, and controlling the density of the developer on the basis of the comparison result, and reference value correcting device for correcting the reference value, the reference value correcting device estimating an amount of the electrically conductive particles that enter within the developing device, and correcting the reference value on the basis of the estimated result.
摘要:
An image forming method includes (i) a charging step of using a charging device including conductive magnetic particles, a rotatable conductive-magnetic-particle carrying member for carrying and conveying the conductive magnetic particles, and a plurality of magnetic-field generation means provided within the conductive-magnetic-particle carrying member, and charging a surface of an image bearing member by applying a voltage to the conductive-magnetic-particle carrying member and causing the conductive magnetic particles to contact the image bearing member, (ii) a latent-image forming step of forming an electrostatic latent image on the charged surface of the image bearing member, and (iii) a developing step of using a developing device facing the image bearing member and including a two-component developer including a toner and magnetic carrier particles, a developer carrying member for carrying the two-component developer, and a plurality of magnetic-field generation means provided within the developer carrying member, and forming a toner image by forming an AC electric field at a portion where the image bearing member faces the developer carrying member and developing the electrostatic latent image by the toner of the two-component developer. An amount of frictional charging (Q1) of the toner with the conductive magnetic particles and an amount of frictional charging (Q2) of the toner with the magnetic carrier particles within the developing device satisfy the following relationship: 0 Q2≧Q1 (mC/kg).
摘要:
An image forming apparatus having an image bearing member for bearing an electrostatic image to be developed by toner, a transfer device for transferring a toner image formed on the image bearing member onto a transfer material, and developing and cleaning device for developing the electrostatic image with developer including toner and carrier and for cleaning residual toner remaining on the image bearing member after transferring, the developing and cleaning device having a developer bearing member for bearing the developer and serving to effect development and cleaning by causing a magnet brush formed by the carrier to contact with the image bearing member, and wherein the following relation is satisfied:.vertline.V.sub.s1 V.sub.dr .vertline./.vertline.V.sub.dr .vertline..times.L.times.m.times..alpha..gtoreq.7(where, V.sub.s1 is a moving speed (mm/sec.) of a surface of the developer bearing member, V.sub.dr is a moving speed (mm/sec.) of a surface of the image bearing member, L is a contact width (mm) of the brush in a moving direction of the image bearing member, m is a cross-sectional area (mm.sup.2) of the magnet brush, and .alpha. is density (flux/mm.sup.2) of the magnet brush).