Fujitsu Corporation

Fuji Xerox Co., Ltd.

Satoshi Takezawa

Yasushige Nakamura

Tomoaki Tanaka

Yoshimichi Katagiri

Norio Sawatari

Makoto Fukuda

Toru Takahashi

Shinichi Yaoi

Seijiro Ishimaru

Tsuneo Watanuki

Mitsuru Sato

Fumio Takei

Sachio Sasaki

Yojiro Kumagae

Katsuji Ebisu

Akira Nagahara

Masao Konishi

Masahiro Wanou

Mitsuo Ozaki

Hiroyuki Sasaki

Takefumi Takahashi

Sadaaki Yoshida

Masae Nakamura

Shigenobu Utaka

Naoyuki Hayashi

The present invention provides a color image forming developer comprising yellow, magenta, and cyan toners each containing an infrared absorber, wherein the cyan toner has a maximum infrared absorbance in the infrared region lower than that of the magenta toner and that of the yellow toner, to simultaneously attain sufficient fixation capacity and sufficient resistance to void formation, and also provides an improved image forming method and an image forming device using the developer.

Color image forming developer, color image forming method, and color image forming device

A toner for developing an electrostatic latent image, including toner particles that include at least a binder resin and a quinacridone pigment. The quinacridone pigment includes quinacridone represented by the following structural formula which has a &#x3b2;-type crystal structure and quinacridone represented by the following structural formula which has a &#x3b3;-type crystal structure. 

Toner for developing electrostatic latent image, image forming apparatus and image forming method

The present invention discloses a yellow toner for flash fixation, comprising an infrared absorbent, one or more yellow colorants, and a binder resin, wherein a* of the infrared absorbent in an CIELAB color space is less than 0, and a* of one or more of the yellow colorants in the CIELAB color space is more than 0, or vice versa; and a developer and an image forming method using the yellow toner.

Yellow toner for flash fixation, and electrophotographic developer and image forming method using the same

A developing device for electrophotographic image has a developing mechanism having a developer carrier for carrying a developer along a preset circulating route including a developing area and a developer restricting element for restricting the developer on the developer carrier, and a developer supply mechanism having a storing unit. The storing unit is filled with a start-up developer in the vicinity of the developer carrier and a replenishing developer remoter than the start-up developer from the developer carrier. The start-up developer and the replenishing developer have different grain sizes or grain size distributions. Further, a developing method for electrophotograhic image has the steps of using the start-up developer at an initial state of use of the developing mechanism, and using the replenishing developer differed in grain size or grain size distribution from the start-up developer after an end of the initial state of use of the developing mechanism.

Developing method and developing device for electrophotographic image, and printing device using the developing device

It is a toner for optical fixing which contains a binder resin, a colorant, and an infrared light absorbent, and the infrared light absorbent has a coloring opacity of 20 or less, and of phthalocyanine compound and/or naphthalocyanine compound.

Toner for optical fixing, manufacturing method therefor and image formation apparatus using it

In a color toner for forming an image, comprising at least a binder resin and a colorant, light-absorbing fine composite particles comprising core particles and at least two coating layers having different refractive indexes laminated on the surface of the core particles or other IR-absorbing compounds such as an azulene compound having a specific structure are used as an infrared absorbing compound. The color toner is used in an electrophotographic color image forming apparatus using a photofixing system for fixing a toner image.

Image forming color toner, color image forming method and color image forming apparatus

Provisions of a large screen, thin sheet-like display device capable of realizing usages just like paper, a sphere-like resin body made of two semispheres capable of being manufactured easily, and a microcapsule containing electrophoretic particles capable of being manufactured easily. The sheet-like display device has a sheet-like display layer and at least one layer containing an element for activating the sheet-like display layer, the layers being integrally formed. The sphere-like resin body has first and second portions made of resins, the absolute value of a difference between both the solubility parameters &dgr; and &dgr; of the resins being &verbar;&dgr; &gE;0.2. The phoretic particle-containing microcapsule has a resin shell in which phoretic particles are contained in a core. The diameter of the core is in a range from 10 &mgr;m to 200 &mgr;m and the circumferential length L of the microcapsule is in a range of (4.1&times;T)&lE;L&lE;(20.1&times;T) where T is a Martin diameter of the microcapsule.

Sheet-shaped display, sphere-like resin body, and micro-capsule

A flash fixing toner includes a binder resin, a coloring agent, a charge control agent, a wax, and an infrared ray absorbing agent. The infrared ray absorbing agent is held within the wax, so as to suppress contact between the infrared ray absorbing agent and the charge control agent.

Flash fixing toner and fabrication method therefor

A non-magnetic one-component developer is provided. This non-magnetic one-component developer includes toner particles and an external additive containing inorganic particles that adhere to the surface of each of the toner particles. In accordance with an emission analysis method utilizing fusion coupling plasma, the rate of free external additive that is determined by the ratio of the number of particles emitting light only from elements of the external additive to one toner particle is 9% or less by number. With such a non-magnetic one-component developer, the external additive will not be welded to the blade of a developing apparatus.

Non-magnetic one-component developer and developing apparatus using said developer

The present invention provides a toner that contains release agent, does not cause contamination in an electrophotographic apparatus, and has environmental stability and charge stability. This release agent-containing toner includes a center portion that contains low-polarity release agent and pigment, and a surface layer formed by a resin phase that covers the center portion.

Toner containing release agent and method of manufacturing said toner

A developing agent comprises an insulative toner and a conductive carrier, and the tensile rupture stress of the insulative toner powder layer is 0.1-1 g wt/cm.sup.2. The insulative toner used is insulative magnetic toner to which hydrophobically treated inorganic particles and conductive particles have been externally added.

Image forming process and apparatus

A method for nonmagnetic monocomponent development is intended for use in an electrophotographic copying machine or electrophotographic printer and is capable of producing highly durable prints of high quality during continuous printing operations. In the nonmagnetic monocomponent development, a developer is transported by a development roller to a photoconductor drum. A Doctor blade triboelectrifies the developer and simultaneously regulates the thickness of a layer of the developer. As the developer, a toner is used, which toner is produced by coagulating minute particles having a diameter between 0.1 and 3.0 .mu.m and then heating the minute particles, thereby thermally fusing these particles.

Method for nonmagnetic monocomponent development

An electrostatic latent image is developed on a latent image carrier and residual toners are collected at the same time. An electrostatic latent image is formed on a rotary endless latent image carrier; developer, including magnetic toners and magnetic carriers, is supplied to a developing area for developing the latent image carrier, and a magnetic brush is formed with the developer in the developing area to thereby collect residual toners on the latent image carrier and develop the electrostatic latent image on the latent image carrier; and the developed image on the latent image carrier is transferred to a sheet. An electrostatic latent image may be developed with a rotary endless latent image carrier; an image forming unit for forming an electrostatic latent image on the latent image carrier; a developing unit having a developer, including magnetic toners and magnetic carriers, and a developer supplying unit for supplying the developer to a developing area for developing the latent image carrier and forming a magnetic brush with the developer in the developing area in order to develop the electrostatic latent image on the latent image carrier with a powdery developer and collect residual toners on the latent image carrier; and a transfer unit for transferring the developed image on the latent image carrier to a sheet.

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Kawasaki, Japan

Satoshi Takezawa