Konica Minolta, Inc.

Konica Minolta Business Technologies, Inc.

Minolta Company, Ltd.

Chiaki Yamada

Masahiro Anno

Naoki Yoshie

Yukiko Uno

Keiko Momotani

Kenji Hayashi

Junya Hirayama

Hirofumi Nakagawa

Mikihiko Sukeno

Satoshi Matsumoto

Yuya Iwagoe

Sho Kim

Masaaki Oka

Miyuki Hotta

Yuya Kubo

Toru Kikuchi

Keyaki Yogome

A fixing device includes: a fixing member that heats a toner image formed on a recording sheet in order to fix the toner image on the recording sheet; a pressurizing member that nips the recording sheet together with the fixing member to pressurize the toner image on the recording sheet; a heater that heats the pressurizing member; and a hardware processor that controls a heating temperature of the pressurizing member by the heater, wherein the hardware processor acquires setting of glossiness of the toner image and controls the heating temperature to be higher as the glossiness in the setting is lower.

Fixing device for setting the glossiness of the toner image

An image forming device includes: a fixing unit that fixes an image formed on a recording medium; a heating unit that heats a recording medium that has been subjected to a fixing process by the fixing unit; and a controller that sets a glossiness of an image on a recording medium, wherein the controller controls a heating amount with the heating unit depending on the set glossiness.

Image forming device and method for controlling the same

A developer for electrostatic latent image contains toner particles. The toner particles contain a resin and a coloring agent, and the coloring agent includes a first coloring agent, a second coloring agent, and a third coloring agent. The first coloring agent is carbon black, the second coloring agent is one or more of C. I. Pigment Violet 19 and C. I. Pigment Violet 23, and the third coloring agent is one or more of C. I. Pigment Brown 23 and C. I. Pigment Brown 25. A content of the second coloring agent is not lower than 8 mass % and not higher than 25 mass % with respect to a total amount of the coloring agents.

Developer for electrostatic latent image

A liquid developer is characterized in that it includes toner particles and an insulating liquid, the toner particles include a resin and a pigment, the pigment includes a first pigment and a second pigment, the first pigment is carbon black, the second pigment is C.I. Pigment Brown 23 and/or C.I. Pigment Brown 25, and 20 to 60% by mass of the pigment is included relative to the toner particles.

Liquid developer

In this fixing device, a pressing roller includes a pressing roller driving unit, and a heating roller includes a heating roller driving unit. Control is performed such that torque of the heating roller in torque distribution between the pressing roller and the heating roller is greater when a belt load reducing device is activated than when the belt load reducing device is not activated. A fixing device and an image forming apparatus thus can be provided, in which the fixability according to the kind of recording medium is excellent, the durability of the fixing belt is high, and the separability between the fixing belt and the recording medium is excellent.

Fixing device and image forming apparatus

A control unit is configured to control torque of a fixing motor and torque of a pressing motor such that tangential force at a part holding paper in cooperation with a fixing member in a pressing member is equal to or greater than tangential force at a part holding paper in cooperation with the pressing member in the fixing member, and that the relation between the tangential force at the part of the pressing member and the tangential force at the part of the fixing member changes in accordance with the smoothness of paper.

Fixing device, image forming apparatus, and method of controlling image forming apparatus

Toner particles have a core-shell structure that first resin particles containing a first resin are attached to or cover surfaces of second resin particles containing a second resin. Heat of fusion with differential scanning calorimetry of the second resin satisfies Equations (1) to (2) below. In Equations (1) to (2) below, H1 and H2 represent heats of fusion (J/g) at initial temperature increase and second temperature increase with differential scanning calorimetry of the second resin, respectively.5&#x2266;1&#x2266;70&#x2003;&#x2003;Equation (1)0.2&#x2266;2/1&#x2266;1.0&#x2003;&#x2003;Equation (2)

Liquid developer and method for manufacturing the same

There is provided a fixing device for fixing a toner image formed on a surface of a recording medium by toner, wherein the toner includes a releasing agent and satisfies T&#x3c;T, where T(&#xb0; C.) represents a melting point of the releasing agent and T(&#xb0; C.) represents a temperature at which an elastic modulus of the toner is 1&#xd7;10Pa, the fixing device includes a first fixing portion and a second fixing portion in this order along a conveyance direction of the recording medium, the first fixing portion presses and heats the toner image such that a maximum temperature T(&#xb0; C.) of the surface of the recording medium satisfies T&#x2266;T&#x3c;T, and the second fixing portion presses and heats the toner image such that a maximum temperature T(&#xb0; C.) of the surface of the recording medium satisfies T&#x2267;T.

Fixing device, image forming apparatus and fixing method

A liquid developer includes an insulating liquid and toner particles which are dispersed in the insulating liquid and contain a resin and a coloring agent. The resin contains a first resin which is a resin containing a component derived from a crystalline polyester resin. The coloring agent contains carbon black and nigrosine. The toner particles have a peak at not lower than 30&#xb0; C. and not higher than 50&#xb0; C. in a DSC curve in temperature decrease.

A liquid developer includes an insulating liquid and toner particles which are dispersed in the insulating liquid and contain a resin and a coloring agent. The resin contains a first resin which is a crystalline urethane-modified polyester resin resulting from increase in chain length of a component derived from a polyester resin by a compound containing an isocyanate group. The toner particles have a peak in a DSC curve in temperature increase at 55&#xb0; C. or higher, have a peak in the DSC curve in temperature decrease at 30&#xb0; C. or higher, and have a storage elastic modulus at 80&#xb0; C., not lower than 1&#xd7;10Pa and not higher than 1&#xd7;10Pa.

Toner for developing an electrostatic latent image contains toner particles, the toner particles contain a resin and a pigment, the pigment includes a first pigment, a second pigment, and a third pigment, the first pigment is carbon black, the second pigment is C. I. Pigment Brown 23 and/or C. I. Pigment Brown 25, and the third pigment is nigrosine.

Toner for developing electrostatic latent image

Toner for developing an electrostatic latent image contains toner particles, the toner particles contain a resin and a pigment, the pigment includes a first pigment and a second pigment, the first pigment is carbon black, and the second pigment is C. I. Pigment Brown 23 and/or C. I. Pigment Brown 25.

An electrostatic latent image developer of the present invention includes a resin, a colorant and a colorant dispersant, wherein the colorant dispersant contains a first polymer compound containing a constitutional unit derived from a monomer A, a constitutional unit derived from a monomer B and a constitutional unit derived from a monomer C, the monomer A is 4-vinylpyridine, the monomer B is CH&#x2550;CR&#x2014;COOR(where Rrepresents hydrogen or a methyl group; and Rrepresents an alkyl group having 1 to 10 carbon atoms), and the monomer C is CH&#x2550;CR&#x2014;COOR(where Rrepresents hydrogen or a methyl group; Rrepresents (CHCHO)CHor (CHCHO)CHCH; and n represents an integer of 12 to 18).

Electrostatic latent image developer

A liquid developer includes toner particles and an insulating liquid, the toner particles include a resin and a pigment, the resin includes a crystalline resin, the pigment includes a first pigment, a second pigment, and a third pigment, the first pigment is carbon black, the second pigment is C.I. Pigment Brown 23 and/or C.I. Pigment Brown 25, the third pigment is nigrosine, and 20 to 60% by mass of the pigment is included relative to the toner particles.

A liquid developer of the present invention includes a toner particle and an insulating liquid, the toner particle including a resin and a pigment, the resin including a polyester resin, the pigment including a first pigment, a second pigment, and a third pigment, the first pigment being a carbon black, 10 to 25 mass % of the first pigment being included in the toner particle, the second pigment being nigrosine, 3 to 15 mass % of the second pigment being included in the toner particle, the third pigment being at least one organic pigment selected from a group consisting of a phthalocyanine blue pigment, a phthalocyanine green pigment, a carmine-based pigment, a naphthol-based pigment, a quinacridon-based pigment, an azo-based pigment, a benzimidazolone-based pigment, and an isoindoline-based pigment, 5 to 20 mass % of the third pigment being included in the toner particle.

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Ibaraki, Japan

Chiaki Yamada