Canon Kabushiki Kaisha

Yasunori Chigono

Harumi Ishiyama

Jun Hirabayashi

Seiji Mashimo

Makoto Fukatsu

Tadashi Furuya

Yasushi Sato

Yasushi Shimizu

Yukio Nagase

Katsuhiro Sakaizawa

Hideyuki Yano

Kazunari Hagiwara

Yukihiro Ohzeki

Hikaru Osada

Kenya Ogawa

Emi Hagiwara

Shintaro Ishida

Takeshi Yamamoto

Atsushi Nakamoto

Takahiro Kawamoto

Masayoshi Kato

Kouichi Okuda

Shuji Moriya

Norio Takahashi

Shunichi Takada

Masao Suzuki

Masahiro Yoshida

Noboru Koumura

Ken Nakagawa

Kazuhisa Kemmochi

Kazuyuki Sato

Hisashi Nakahara

Koichi Okuda

Seiichi Shinohara

Manami Haraguchi

Yukihide Ushio

Kenji Muto

Shuhei Tokiwa

Takeshi Kawamura

Ryo Inoue

Yasuhiro Nakata

Izumi Narita

Takeo Yamamoto

Tomoaki Miyazawa

Maki Okajima

Nobuyuki Ito

Takahiro Hosokawa

Hirokazu Usami

Koichi Otaka

Naohiro Nakane

Shohei Fukuya

Yasushi Satoh

Kazunori Taira

A toner comprising a toner particle that contains a binder resin, wherein the surface of the toner particle is covered with a resin A; the modulus of elasticity Ea of the resin A and the modulus of elasticity Eb of the binder resin satisfy the following formula:0.5&#x2264;()&#xd7;100&#x2264;50.0; andthe adhesion force Aof the toner particle is at least 500 nN when a probe having spherical SiOattached at the tip of a cantilever is pressed into the toner particle at 3 &#x3bc;N.

Toner

A developing device includes: a developing container for accommodating developer, a developer carrying member, and a plate-like elastic member. In a state in which the elastic member contacts the developer carrying member without being deformed, an angle formed between a flat reference surface passing through a surface of the elastic member which is continuous to a contact portion of the elastic member with the developer carrying member and which is downstream of the contact portion with respect to the movement direction and a tangent plane of the developer carrying member and a contact position between the elastic member and the developer carrying member is 10&#xb0; or more and 45&#xb0; or less, and the elastic member includes a first region including the contact portion and a second region which is provided continuously from the first region toward the supporting portion and which is lower in rigidity than the first region.

Developing device, process cartridge and image forming apparatus

A toner containing toner base particles and an external additive, wherein regions with different tribocharging polarities with respect to a magnetic carrier are present in a domain-matrix structure on the surface of the toner base particles. The island region B has a predetermined height, the external additive has a reverse polarity to the region B in terms of tribocharging polarity to the magnetic carrier, the external additive contains a first external additive having a number-average primary particle size of 80-150 nm and a second external additive having a number-average primary particle size of 10-60 nm, and an average coverage Cb (%) with the first external additive in the region B is 27-100% and a coverage Ca (%) with the first external additive in the sea region A is 12% or less.

Toner and method for producing the same, and two-component type developer

A glossiness processing apparatus for glossiness treatment includes a first glossiness treatment unit; a second glossiness treatment unit provided downstream of the first glossiness treatment unit with respect to a feeding direction of a sheet; wherein each of the units including a film movable having a surface in contact with an image surface of the sheet while moving; a heating member contacted to another surface of the film, the heating member including a plurality of heat generating elements arranged along a direction substantially perpendicular to a moving direction of the film; a pressing member cooperating with the heating member to form a nip, with the film therebetween, for nipping and feeding the sheet; wherein positions of the heat generating elements are offset relative to positions of the heat generating elements of the first glossiness treatment unit.

Glossiness processing apparatus and image forming apparatus

An image forming apparatus includes a plurality of image forming stations for forming a toner image having superposed toner image components on a recording material, a fixing portion for fixing the toner image on the recording material, and a glossiness treatment unit, operable when a glossiness treatment mode is selected, for glossiness treatment of the toner image fixed on the recording material by heating the toner image. The glossiness treatment unit includes a film movable in a feeding direction of the recording material, a heating member contacting the film, and a pressing member cooperating with the heating member to form a nip, with the film therebetween, for nipping and feeding the recording material. In the glossiness treatment mode, one of the image forming stations forms, as a topmost layer, a toner image having a tone gradation provided by a dot growth type screening, and an image forming station, other than the one for forming the topmost toner image, forms the toner image having the tone gradation provided by a line growth type screening.

Image forming apparatus providing glossiness treatment

An image forming apparatus has a first recording mode of outputting the recording material without passing thru the glossiness applying device after fixing and a second recording mode using the glossiness applying device, and then outputting the recording material. In the latter recording mode (B), when a void ratio G of toner in the toner image not yet subjected to the glossing process by the glossiness applying device is defined by a thickness tof a toner layer on the recording material after fixing and before entering the glossiness applying device, and a thickness tof a toner layer on the recording material after passing through the glossiness applying device, satisfies the formula: G=100&#xd7;(t-t)/t. In the recording mode (B), fixing conditions for the fixing device and the glossiness applying device are respectively set so that the void ratio of toner satisfies a formula 15&#x2266;G&#x2266;60.

Image forming apparatus

An image heating apparatus that causes a recording material carrying a fixed toner image to be in close contact with a belt and improves gloss level of an image surface is provided. A decrease in the separability of the recording material from the belt can be suppressed by control of the position on the belt in close contact with the leading edge of the recording material.

Image heating apparatus controlling relative positions of fixing belt and recording material

An image forming apparatus includes an image bearing member; a charging device for electrically charging the image bearing member; a rotatable developer carrying member for carrying a developer to develop an electrostatic image formed on the image bearing member with the developer, the developer carrying member being supplied with a developing bias voltage including an AC voltage; non-rotatable magnetic field generating device, disposed inside the developer carrying member, for magnetically attracting the developer on the developer carrying member, wherein the developer carrying member has a surface elastic layer, and the developer carrying member is press-contacted to the image bearing member, and the developer is one component magnetic toner, and a maximum value of an absolute value of the developing bias voltage |V|max and a surface potential of the image bearing member charge by the charging device is Vd(V), satisfy,||max=|

Image forming apparatus when a maximum developing bias voltage |V| max and surface potential Vd of a charged image bearing member satisfy: |V| max&#x2266;|Vd|

A developing device includes a rotatable developer carrying member for carrying a developer to develop an electrostatic image formed on an image bearing member with the developer; non-rotatable magnetic field generating means, disposed inside the developer carrying member, for magnetically attracting the developer on the developer carrying member; a regulating member for regulating an amount of the developer carried on the developer carrying member, wherein the developer carrying member is provided with a surface elastic layer, and the developer carrying member is press-contacted to the image bearing member, and wherein, the developer is an one component magnetic toner having an average circularity not less than 0.965, and an amount of the developer per unit area of the developer regulated by the regulating member is 5-14 g/m, and an amount of electric charge thereof is 10-50 &#x3bc;C/g.

Developing apparatus featuring a developer carrying member with an elastic surface layer

An image forming apparatus includes an image bearing member; a charging member for electrically charging the image bearing member; developing means for developing with a developer an electrostatic latent image formed on the image bearing member, the developing means having a developer carrying member for carrying the developer, wherein a gap is formed between the developer carrying member and the image bearing member; bias voltage applying means for applying a bias voltage to the developer carrying member, wherein the bias applying means applies an AC bias when the electrostatic latent image is developed, wherein the developing means is capable of collecting the developer fro the image bearing member, and an amplitude of an AC bias voltage applied to the developer carrying member by the bias applying means when the the developer is collected, is larger than that when the the electrostatic latent image is developed.

Image forming apparatus which recovers toner by developing device

An image-forming apparatus includes a pre-charge exposure device which removes electric charge from a photoconductor drum to increase a potential contrast between the surface of the photoconductor drum and the surface of a charge roller in an upstream region of a nip region between the photoconductor drum and the charge roller in the rotating direction of the photoconductor drum, so that toner accumulating in an upstream region of the nip region in the rotating direction of the photoconductor drum is restrained and prevented from being discharged onto an image-forming region. When the toner accumulating in the upstream region of the nip region in the rotating direction of the photoconductor drum is to be discharged onto a non-image-forming region, the pre-charge exposure device is turned off so that the potential contrast decreases.

Image-forming apparatus having pre-charge exposure device for image carrier

A charging member for charging a member to be charged, includes an elastic foam member provided at a surface of the charging member. The elastic foam member includes a plurality of cell portions with wall portion defining the cell portions. The gaps connecting the cell portions have areas which are not less than 5% and not more than 50%, for respective cells.

Charging member having an elastic foam member including cell portions whose gap ratio is 5% to 50%, charging apparatus, process cartridge, and image forming apparatus having such charging member

A charging member for charging a member to be charged and an image forming apparatus provided with the same have electrically conductive particles and an electrically conductive particle bearing member having elasticity and bearing the electrically conductive particles thereon, and the degree of cohesion of the electrically conductive particles is 0.1 to 85%. Thereby, the non-uniformity of a halftone image peculiar to particle charging can be improved.

Charging member and image forming apparatus provided with the same

A charging apparatus includes a charging member for charging a member to be charged while forming a nip with the member to be charged, and electroconductive particles disposed in the nip. The charging member is supplied with a voltage of a certain polarity, a surface of the member to be charged is triboelectrically charged by a surface of the charging member so as to have a polarity opposite from that of the voltage, and the electroconductive particles are triboelectrically charged in the nip so as to have a polarity opposite from that of the voltage.

Charging apparatus, process cartridge and image forming apparatus having electroconductive particles charged in a nip between a charging member and a member to be charged

Charging apparatus, process cartridge and image forming apparatus

Growing community of inventors

Susono, Japan

Yasunori Chigono