Minolta Company, Ltd.

Konica Minolta Business Technologies, Inc.

Minolta Camera Kabushiki Kaisha

Konica-minolta Holdings, Inc.

Masahiko Matsuura

Hiroshi Mizuno

Takaji Kurita

Keyaki Yogome

Takeshi Maeyama

Hidetoshi Miyamoto

Shigeo Uetake

Junya Hirayama

Toshiya Natsuhara

Eiichi Sano

Atsuto Hirai

Akihito Ikegawa

Tomoo Izumi

Masaharu Kanazawa

Masami Yamada

Masahide Ueda

Hiroyuki Yamasaki

Yoshihisa Terasaka

Tamotsu Shimizu

Katsuyuki Nanba

Sadafusa Tsuji

Yuji Nagatomo

Hiroshi Murasaki

Naoki Masazumi

Kentaro Katori

Masashi Yamamoto

Keiko Momotani

Eiji Tabata

Hiroshi Ishibe

Katsuhiko Asai

Makiko Mandai

Susumu Mikawa

Kazuaki Okumura

Mikihiro Komatsu

Takashi Kondo

Junji Machida

Tetsumaru Fujita

Satoshi Deishi

Shuichi Nakagawa

Makoto Shimazoe

Kunitomo Sasaki

Yasuo Shirodai

Kazuko Fukumoto

Akira Hirota

Satoshi Yoshida

Yoshiko Yaoi

Tetsuya Kobayashi

In a wet-type image forming apparatus, a plurality of patch images are successively transferred to a recording medium corresponding to a plurality of transfer biases obtained as bias value of the transfer bias is changed; density detecting unit measures image density of each of the plurality of patch images on the recording medium and detects a range of bias values of transfer bias in which the image density of patch image is substantially saturated; and the bias value of transfer bias when a normal image is formed on the recording medium is set to be within the range of bias values of transfer bias in which the image density of patch image is substantially saturated and to be not larger than absolute value of the bias value at which the image density of patch image is substantially saturated.

Wet-type image forming apparatus and method of setting transfer bias in wet-type image forming apparatus

A wet-type image forming apparatus includes a density detection unit and a charge amount control unit for controlling the charge amount of toner on a liquid developer carrier. An image forming unit forms patch images while the charge amount control unit successively changes the charge amount of toner on the liquid developer carrier in a state in which a development bias is held at a prescribed value. The density detection unit detects the image density of each patch image thereby detecting a range of the charge amount of toner in which the image density of the patch image is almost saturated. The charge amount of toner in normal image formation is set to be equal to or greater than the range of the charge amount of toner in which the image density of the patch image is almost saturated.

Wet-type image forming apparatus

An image forming apparatus includes a section for obtaining a property of a recording material; an adjusting section for adjusting a toner amount of a toner image formed by development depending on the property of the recording material; a charging section for charging the toner image before transfer; and a controlling section for adjusting a charging quantity by the charging section depending on the toner amount, where an appropriate quantity of charge depending on the toner amount is provided to the toner image before transfer to the recording material. Depending on the property of the recording material, an appropriate toner amount is transferred at a high transfer efficiency, and uniformity of a solid concentration is ensured.

Image forming apparatus

An image forming apparatus including a toner charge amount control portion for controlling the toner charge amount based on the property of a recording material; a recording material charging section for charging the surface of the recording material based on the toner charge amount controlled by the aforementioned toner charge amount control portion; and a recording media charge amount control portion for controlling the amount of charge on the surface of a recording material applied by the recording material charging section.

Image forming apparatus having toner charge amount control

The purpose is to provide, in a development apparatus using a two-component developer, a compact development apparatus, image forming apparatus and development method that prevents carrier deterioration and that can carry out good image formation over a long time period. In a development apparatus using a developer in which are mixed a toner, a carrier, and opposite polarity particles that are charged to a polarity opposite to the charging polarity of the toner, the surface charge density of the opposite polarity particles should be in the range of 0.5 to 3.0 times the surface charge density of the carrier.

Method for developing an electrostatic latent image

An electronic device includes a display having a memory function and a communications capability. Display functions are controlled based on a state of the operation of the device and/or based on a state of received data. Also disclosed is a method of selectively displaying advertising information based on a state of the device where the advertising can be maintained on the display without requiring any power consumption.

Electronic apparatus

To provide a cleaning apparatus capable of maintaining high cleaning performance even if surface roughness of an image carrier is increased due to wear and a wet image forming apparatus installing the concerned cleaning apparatus, thereby enabling to form images of a stable quality. The cleaning apparatus for removing liquid developer remaining on the surface of a latent image carrier and an intermediate transfer member, which are an image carrier of the image forming apparatus for forming images with the liquid developer including toner particles and carrier liquid, includes three stages of cleaning sections such as a preliminary cleaning member for making contact with the image carrier and suspending the toner particles adhered to the surface of the image carrier in the carrier liquid, a toner particles removing member for removing the suspended toner particles by electrostatic force, and a carrier liquid removing member for removing the remaining carrier liquid.

Image forming apparatus with cleaner having member in contact with a surface of an image carrier

A developing unit using a two-component developer intended to provide an image forming apparatus capable of forming a high-quality image for a long period of time. A developing unit using a developer contains toner, carrier and opposite polarity particles having a polarity opposite to the charging polarity of toner includes separation means for separating the toner or opposite polarity particles, and control mechanism for controlling opposite polarity particle separation ratio in response to the image area ratio and the number of prints.

Image forming apparatus having developer with opposite polarity particles

A development apparatus and an image forming apparatus capable of minimizing deterioration of a carrier for a long time, even in a case of continuous formation of images of a smaller image area ratio. The charging of toner is assisted by using a developer composed of a mixture of toner and the carrier, to the surface of which is added a reverse polarity particle having a polarity reverse to that of a charged toner. Separation of the toner or reverse polarity particle of the developer prior to a process of development prevents the reverse polarity particle from being consumed in a developing area, whereby an effect thereof is maintained for a long time.

Development apparatus, image-forming apparatus and developing method using reverse polarity particles

A developing device, which is provided with: a developer tankthat houses a developercontaining a toner, a carrier for charging the toner and reverse polarity particles that are charged with a polarity reversed to the electrostatic charge polarity of the toner by the carrier; a developer-supporting memberthat supports the developer supplied from the developer tank on the surface thereof, and transports the developer; and a separating mechanismthat separates the toner or the reverse polarity particles from the developer supported on the developer-supporting member, and the reverse polarity particles are collected into the developer tank, is provided, and an image-forming apparatus having such a developing device and an image-forming method applied thereto are also provided.

Developing device and image-forming apparatus using multiple-component developer

In a development apparatus of the hybrid method using a component developer, a development apparatus and a development method are provided that prevent the reduction of density or the occurrence of residual images (ghost images) and can carry out good image forming over a long period of time. A development apparatus has the feature that the surfaces of the toner supporting member and the developer supporting member move in a mutually opposite direction at the part where they are opposite to each others. The development apparatus further employs an electric field in the closest part applied in a direction to recover the toner from the toner supporting member to the developing supporting member, wherein the magnitude of the electric field is in the range from 2.5&#xd7;10V/m to 5&#xd7;10V/m. The developer of the development apparatus is such that its share (PD) in the space of the closest part of the opposing portion satisfies the following relationship: 0.09&#x2266;PD&#x2266;650&#xd7;Dss.

Development apparatus, image forming apparatus and developing method that employ a magnetic brush

A compact development apparatus using a two-component developer and an image forming apparatus wherein carrier deterioration is prevented to ensure formation of a high-quality image for a long time. The development apparatus uses the developer made up of a mixture of toner, carrier, and opposite polarity particles to be charged oppositely to the toner wherein the opposite polarity particles contain the particles having a relative dielectric constant of 6.7 or more.

Developing apparatus and image forming apparatus

Disclosed is a reversible image display medium which can be repeatedly used and can display high quality images, in which cells between the two substrates accommodate a dry developer containing at least two kinds of frictionally chargeable dry developing particles having different chargeable polarities and different optical reflection densities; images are displayed by forming an electrostatic latent image corresponding to the image to be formed on one of the two substrates to drive the developing particles in an electrostatic field based on the electrostatic latent image; a developer-facing surface of one of the substrates has a surface resistivity of at least 1&#xd7;10ohm/square; a developer-facing surface of the opposite substrate has a surface resistivity from 1&#xd7;10ohm/square to 1&#xd7;10ohm/square; a developer-facing surface of one of the substrates has a surface average median roughness Ra of 0.2 &#x3bc;m to 0.5 &#x3bc;m; and an external surface of the substrate on image observation side has a surface average median roughness Ra of 0.2 &#x3bc;m to 0.7 &#x3bc;m.

Reversible image display medium

An image forming apparatus for forming an image by developing a latent image formed on an image carrier, using a developer including a toner and a carrier. The image forming apparatus comprises: a developer conveying member that conveys the developer; a first collecting unit that collects, by generating a first electric field, the toner from the developer at a first position that is set halfway through a route of conveyance of the developer by the developer conveying member; and a second collecting unit that collects, by generating a second electric field, residual toner from the developer at a second position that is downstream of the first position in the route of conveyance of the developer.

Image forming apparatus, developing apparatus, and finely-divided toner particle collecting apparatus

An image forming apparatus including first and second image forming portions, and a device for detecting a type of an image display medium, image formation by the first image forming portion being allowed when the medium type is a normal image display medium (PP), and image formation by the second image forming portion being allowed when the medium type is a reversible image display medium (TP). Another image forming apparatus including first and second image forming portions, and an image formation element setting switching device, image forming elements being set in a standard mode to a standard state for forming an image on a medium for the standard mode, and being switched in a non-standard mode to a non-standard state for forming an image on a medium for the non-standard mode.

Image forming apparatus capable of forming images on rewritable and reversible display media

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Suita, Japan

Masahiko Matsuura