Fuji Xerox Co., Ltd.

Kazuo Maruyama

Eiichi Akutsu

Takeshi Sumikawa

Tsuneo Noami

Kiyoshi Horie

Nobumasa Furuya

Kenji Ogi

Yasuo Yamamoto

Hiroshi Takayama

Toshiro Yamamoto

Toru Okamoto

Koji Masuda

Koji Adachi

Shigehito Ando

Hideaki Tanaka

Tomoo Kobayashi

Yoshihiko Fujimura

Koichi Saitoh

Shigeki Nishimura

Tsutomu Sugimoto

Isao Ito

Yasuyuki Tsutsumi

Hiroo Soga

Shigeo Ohno

Susumu Hirakata

Hiroh Soga

Yuji Suemitsu

Kazuya Yamanoi

Tadashi Kiyama

Michiaki Takahashi

Kouji Adachi

Masashi Ogasawara

Toshirou Yamamoto

Takeshi Nagao

Tsuneo Naomi

An image recording apparatus includes an image carrying part, a developing part and an image transferring part. The image carrying part has a surface on which an electrostatic latent image is formed. The developing part develops the electrostatic image into a toner image by selectively applying toner to the surface of the image carrying part. The image transferring part transfers the toner image onto a recording sheet or an intermediate image transferring part. Fine particles are uniformly formed on the surface of the image carrying part, and a portion of the fine particles is transferred from the image carrying part with the toner image. The fine particles are smaller in diameter than the toner particles.

Image recording apparatus and method with improved image transfer characteristics

In an image recording apparatus, the surface of an image carrier is formed of a material having a high affinity to particulates the particle size of which is smaller than toner and the surfaces of which have been treated to be hydrophobic, so that a layer of the particulates treated to be hydrophobic is retained on the surface of the image carrier.

Image carrier and apparatus and method for recording image using image carrier

In an image forming apparatus, three or more (four in this case) cylindrical photosensitive members 1 to 4 on which latent images are formed and developed through use of toner to thereby produce toner images, are arranged so as to share a tangential line in common, and a cylindrical intermediate transfer member 51 is provided. Alternatively, a first unit containing one or more image carriers is positioned next to a first transfer member and a second unit containing one or more image carriers is positioned next to a second transfer member such that there is reflectional symmetry between the first and second units and the transfer members.

Color image forming apparatus and method using plural photosensitive

An ink transfer medium for toner is disclosed, comprising the following layers, in this order: a heat-generating resistive layer heated by input of electrical signal, a conductive layer, and an ink release layer having a toner layer on it, an adhesion from 0.2 g/mm to 40 g/mm as measured by the 90.degree. peeling off method and consisting of a viscoelastomer having a critical surface tension of 35 dyne/cm or less. It can be re-inked by attaching toner to the portions of the ink transfer medium from which the ink has been removed, using toner held in a toner holding means. An ink transfer process for toner is also disclosed, wherein an ink transfer medium having toner layer formed on the above described ink release layer is used and the toner layer contacts the recording medium under pressure, while a recording head contacts the anisotropic conductive layer of the ink transfer medium, so that an electrical signal is input and then toner fused by heat generated by the heat-generating resistive layer is transferred to the recording medium.

Re-inking process

Ink transfer medium for toner, ink transfer process and re-inking

A multi-color image formation apparatus and method of its use prevent deterioration of stability due to a recharging process in one cycle of multi-color image formation and also effectively avoid color mixing in the toner image previously formed. The multi-color image formation apparatus includes an electrostatic latent image formation member, a first electrostatic latent image formation device for forming a first electrostatic latent image on the electrostatic latent image formation member, a first developer for developing the first electrostatic latent image with a first toner, a second electrostatic latent image formation device for forming a second electrostatic latent image on the electrostatic latent image formation member, and a second developer for developing the second electrostatic latent image with a second toner. The second electrostatic latent image formation device reduces the absolute value of the potential of an image portion of the electrostatic latent image and also reduces the absolute value of the potential of the common area of background portions of the first and second electrostatic latent images.

Multi-color image formation apparatus and method for preventing the

A recording apparatus is disclosed comprising a recording head adapted to hold fusible ink, a transfer member facing the recording head without contacting it, heating means for heating the transfer member to a predetermined temperature, pressure applying means facing the transfer member in such a way that a recording medium can pass therebetween and cooperating with the transfer member for applying pressure to the recording medium, and voltage applying means for applying a voltage between the recording head and the transfer member, the recording head supplying the fusible ink in a molten state to the transfer member, the predetermined temperature being higher than the softening point of the ink and lower than the melting point of the ink, and the transfer member comprising materials having a surface energy approximately equal to the value of the critical surface tension of the ink and smaller than the surface energy of the recording medium.

Ink jet recording apparatus

A display medium is disclosed, comprising at least the following layers, in this order: a heating resistive layer, a conductive layer, a background layer and an erasable thermochromic layer, and comprising a heating resistive layer which may comprise at least two layers. The display medium may also comprise a contact resistance reducing layer on the heating resistive layer and a protective layer on the erasable thermochromic layer.

Erasable display medium

A first negative or positive latent electrostatic image is formed on a latent image bearing body with a first writing device, and developed with a monochromatic toner. A second latent image of the type different than the first latent image is formed by a second writing device after setting the background voltage of the second image to have an absolute value larger than the first image, and then developed with one or two color toners selected from three color toners of respective multi-color developing units. A plurality of multi-color toner images may be formed in respective rotation cycles of the latent image bearing body. A monochromatic toner image may be formed in the same rotation cycle as one of the multi-color toner images. Finally, a plurality of toner images thus produced are transferred onto a recording sheet at once after polarities of the plurality of toner images have been arranged into the same polarity.

Color image forming apparatus and method

In a method of regenerating an ink image recording medium of a multilayered structure, after an ink image on the ink image recording medium is recorded, the surface of the heat-fusible ink layer of the ink image recording medium is uniformly charged. Then, a liquid ink for generating the ink layer, being placed under an electric field applied thereto, is supplied to the ink image recording medium. The liquid ink is prepared by dispersing heat-fusible ink powder into a liquid dispersion medium. As a result, the heat-fusible ink powder selectively sticks onto the portion on the ink release layer where the heat-fusible ink layer is absent because the ink was transferred. Finally, the ink image recording medium thus processsed is dried to remove the liquid dispersing medium.

Method of regenerating an ink image recording medium

An image forming method of the present invention comprises: a first toner image formation process for forming a first toner image by forming, on a latent image carrier, a first latent image which corresponds to a first image and developing the first latent image by a first toner charged to one polarity through a development process selected from normal and reverse development process selected from normal and reverse development processes so as to correspond to the polarity of the first toner; a second toner image formation process for forming a second toner image by forming, on the latent image carrier, a second latent image which correspond to a second image and developing the second latent image by a second toner charged to the other polarity by the other development process while applying a developing bias; and a transfer treatment process for simultaneously transferring said first and second toner images to a transfer medium; wherein said developing bias VB2 satisfies the following equations:

Image recording method

Composite image recording apparatus

A latent color image developing system for copying a document having a first color images and second color images develops the first color images with a first color developer and the second color images with a second color developer. The second color developer includes a toner and a magnetic carrier having a density of less than 4.0 g/cm.sup.3 and a particle size in the range of 30-50 microns. A developer roll is used having a main developing pole with a flux density of more than 500 gauss in a nip region proximate a photosensitive member having latent electrostatic images to be developed.

Latent image color developing system

In electrostatic latent image developing process capable of effecting either positive or negative reproduction a magnetic toner of a high resistivity is controlled to form a magnetic brush having a potential insufficient for development. The toner chain constituting the brush is separated under the influence of an electric field between the developing roll and the image carrier, to produce toner particles having one polarity continuing with the developing roll, and particles of the opposite polarity transferred to the carrier.

Process for developing and transferring magnetic toner images

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Kanagawa, Japan

Kazuo Maruyama