Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Teppei Yawada

Katsuyuki Kitajima

Tomoaki Tanaka

Tatsuhiro Igarashi

Manabu Furuki

Masashi Ikeda

Masahiro Uchida

Makoto Kamisaki

Masataka Kuribayashi

Shota Oshima

Takafumi Koide

Naoki Ota

Yusuke Fukuda

Asafumi Fujita

Kotaro Yoshihara

Tsuyoshi Murakami

Yasuhisa Morooka

Yuka Ishihara

Motoko Sakai

Mona Tasaki

Emi Takahashi

Jun Sekiya

Narumasa Sato

Yoshinari Ueno

Koji Funaba

A white toner includes a toner particle that contains a binder resin containing a hybrid resin in which an amorphous resin unit and a crystalline polyester resin unit are chemically bonded to each other, surface-treated titanium oxide, and a release agent, in which a proportion of Al atoms in a surface of the surface-treated titanium oxide is 3 atomic % or greater and 20 atomic % or less, and a proportion of Ti atoms in the surface is 5 atomic % or greater and 15 atomic % or less.

White toner, electrostatic charge image developer, and toner cartridge

An image forming apparatus includes: an electrophotographic photoreceptor; a charging device that charges a surface of the electrophotographic photoreceptor; an electrostatic charge image-forming device that forms an electrostatic charge image on the charged surface of the electrophotographic photoreceptor; a developing device that stores a developer containing a toner, and supplies the developer to develop the electrostatic charge image on the surface of the electrophotographic photoreceptor into a toner image, wherein the developing device has: a first developing member that is disposed to face the electrophotographic photoreceptor, holds the developer, and transports the developer to a development region; a second developing member that is disposed downstream of the first developing member in a rotation direction of the electrophotographic photoreceptor so as to face the electrophotographic photoreceptor, holds the developer, and transports the developer to a development region; a first power source that applies, to the first developing member, a developing voltage obtained by superimposing an AC voltage on a DC voltage; and a second power source that applies, to the second developing member, a developing voltage obtained by superimposing an AC voltage on a DC voltage; a transfer device that transfers the toner image on the surface of the electrophotographic photoreceptor to a surface of a recording medium; a fixing device that fixes the toner image to the surface of the recording medium; and a control device that acquires image information regarding the toner image, and controls at least one of the first power source and the second power source according to the image information such that the AC voltage of the developing voltage applied to the second developing member has a lower frequency than the AC voltage of the developing voltage applied to the first developing member.

Image forming apparatus

A white toner includes a toner particle that contains a binder resin, a release agent, and titanium oxide, at least a part of the titanium oxide being present in a release agent domain, in which in observation of a cross section of the toner particle, an average major axis length Dt of the toner particle, an average major axis length Dw of the release agent domain, and an average major axis length Dp of the titanium oxide in the release agent domain satisfy Expressions (1) and (2).2×≤10×  Expression (1):0.1×≤0.5×  Expression (2).

A photoluminescent toner includes a photoluminescent toner particle that contains a binder resin, a release agent, and a photoluminescent pigment and has a release agent domain, and a silicone oil-treated silica particle that is externally added to the photoluminescent toner particle, in which in observation of a cross section of the photoluminescent toner particle, an average major axis length Dw of the release agent domain and an average major axis length Dp of the photoluminescent pigment satisfy Expression (1).0.3≤≤1.0  Expression (1):

Photoluminescent toner, electrostatic charge image developer, and toner cartridge

An electrostatic charge image developing toner includes toner particles having an average circularity of 0.96 to 1.00 and organic particles having an aspect ratio of 0.4 to 0.9 as an external additive.

Electrostatic charge image developing toner and electrostatic charge image developer

A carrier for developing an electrostatic charge image has magnetic particles and a resin coating that covers the magnetic particles and contains at least one lubricant. The resin coating has a dispersed phase of the lubricant and meets requirement (1). Requirement (1): the lubricant content in a top layer&#x3e;the lubricant content in a middle layer&#x3e;the lubricant content in a bottom layer The top, middle, and bottom layers are of the resin coating divided into three in the direction of thickness, and the lubricant content is the percentage area of the dispersed phase of the lubricant in a cross-section of the layer taken along the thickness thereof.

Carrier for developing electrostatic charge image, electrostatic charge image developer, and image forming apparatus

An image forming apparatus includes an image holding member, a charging unit that charges a surface of the image holding member, an electrostatic charge image forming unit that forms an electrostatic charge image on the charged surface of the image holding member, a developing unit that includes an electrostatic charge image developing toner and that develops the electrostatic charge image on the surface of the image holding member with the electrostatic chare image developing toner to form a toner image, an intermediate transfer body having a circumferential surface of which micro rubber hardness is in a range of 45 to 65, a first transfer unit that first transfers the toner image formed on the surface of the image holding member to a surface of the intermediate transfer body, and a second transfer unit that second transfers the toner image transferred to the surface of the intermediate transfer body to a recording medium, wherein the electrostatic charge image developing toner satisfies the following formulae(ln &#x3b7;(1)&#x2212;ln &#x3b7;(2))/(1&#x2212;2)&#x2264;&#x2212;0.14,(ln &#x3b7;(2)&#x2212;ln &#x3b7;(3))/(2&#x2212;3)&#x2265;&#x2212;0.15, and(ln &#x3b7;(1)&#x2212;ln &#x3b7;(2))/(1&#x2212;2)&#x3c;(ln &#x3b7;(2)&#x2212;ln &#x3b7;(3))/(2&#x2212;3)wherein &#x3b7;(T1) represents a viscosity of the electrostatic charge image developing toner at 60&#xb0; C., &#x3b7;(T2) represents a viscosity of the electrostatic charge image developing toner at 90&#xb0; C., and &#x3b7;(T3) represents a viscosity of the electrostatic charge image developing toner at 130&#xb0; C.

Image forming apparatus and toner with temperature-viscosity relationship

An image forming apparatus includes an image holding member, a charging unit that charges the surface of the image holding member, an electrostatic charge image forming unit that forms an electrostatic charge image on the charged surface of the image holding member, a developing unit that includes a developer containing toner particles containing a release agent having a melting temperature ranging from 60&#xb0; C. to 100&#xb0; C. and that develops the electrostatic charge image on the surface of the image holding member with the developer to form a toner image, a transferring unit that transfers the toner image formed on the surface of the image holding member to the surface of a recording medium, and a fixing unit that fixes the toner image transferred to the surface of the recording medium, wherein the fixing unit includes an endless member to be heated, the endless member contacts with the toner image transferred to the surface of the recording medium; a pressure member that presses the endless member to form a nipping region between the pressure member and the endless member; a first heater that is in contact with the inner surface of the endless member in the nipping region to heat the endless member; a second heater that is disposed in contact with the endless member and downstream of the first heater in the operational direction of the endless member to heat the endless member; and a collection member that is disposed in the vicinity of the second heater so as to face the outer surface of the endless member and that collects particles.

An image forming apparatus includes: an image holding member; a charging unit that charges a surface of the image holding member; an electrostatic image forming unit that forms an electrostatic image on the charged surface of the image holding member; a developing unit that houses an electrostatic image developer including a toner containing an external additive and develops the electrostatic image formed on the surface of the image holding member with the electrostatic image developer to thereby form a toner image; a transfer unit that transfers the toner image formed on the surface of the image holding member onto a surface of a recording medium directly or through an intermediate transfer body; and a fixing unit that fixes the toner image transferred onto the surface of the recording medium. The transfer unit includes a contact portion-forming member that comes into contact with the image holding member or the intermediate transfer body to form a contact portion and a transfer bias application unit that applies a transfer bias including a superimposed voltage to the contact portion. The superimposed voltage has two peak values and is composed of an AC voltage and a DC voltage. The AC voltage has a duty ratio D of less than 50% on a peak value side opposite to a peak value that causes the toner in the contact portion to move from the image holding member or the intermediate transfer body toward the contact portion-forming member. The DC voltage causes the electric potential of the contact portion-forming member to be shifted to the side opposite to the charge polarity of the toner such that the absolute value of the electric potential of the contact portion-forming member is larger than the absolute value of the electric potential of the image holding member or the intermediate transfer body. The toner satisfies the following formulas:(ln &#x3b7;(1)&#x2212;ln &#x3b7;(2))/(1&#x2212;2)&#x2264;&#x2212;0.14;(ln &#x3b7;(2)&#x2212;ln &#x3b7;(3))/(2&#x2212;3)&#x2265;&#x2212;0.15; and(ln &#x3b7;(1)&#x2212;ln &#x3b7;(2))/(1&#x2212;2)&#x3c;(ln &#x3b7;(2)&#x2212;ln &#x3b7;(3))/(2&#x2212;3),

Image forming apparatus including an electrostatic image developer including a toner

An image forming apparatus includes an image holding member, a charging unit that charges a surface of the image holding member, an electrostatic charge image forming unit that forms an electrostatic charge image on the charged surface of the image holding member, a developing unit that includes an electrostatic charge image developing toner and that develops the electrostatic charge image on the surface of the image holding member with the electrostatic chare image developing toner to form a toner image, an intermediate transfer body that has a circumferential surface having a plurality of grooves and an average in-plane roughness ranging from 10 nm to 30 nm, a first transfer unit that first transfers the toner image formed on the surface of the image holding member to a surface of the intermediate transfer body, and a second transfer unit that second transfers the toner image transferred to the surface of the intermediate transfer body to a recording medium, wherein the electrostatic charge image developing toner satisfies the following formulae(ln &#x3b7;(1)&#x2212;ln &#x3b7;(2))/(1&#x2212;2)&#x2264;&#x2212;0.14,(ln &#x3b7;(2)&#x2212;ln &#x3b7;(3))/(2&#x2212;3)&#x2265;&#x2212;0.15, and(ln &#x3b7;(1)&#x2212;ln &#x3b7;(2))/(1&#x2212;2)&#x3c;(ln &#x3b7;(2)&#x2212;ln &#x3b7;(3))/(2&#x2212;3),wherein &#x3b7;(T1) represents a viscosity of the electrostatic charge image developing toner at 60&#xb0; C., &#x3b7;(T2) represents a viscosity of the electrostatic charge image developing toner at 90&#xb0; C., and &#x3b7;(T3) represents a viscosity of the electrostatic charge image developing toner at 130&#xb0; C.

Electrophotographic image forming apparatus

An image forming apparatus includes an image holding member, a charging unit that charges the surface of the image holding member, an electrostatic latent image forming unit that forms an electrostatic latent image on the charged surface of the image holding member, a developing unit that develops the electrostatic latent image to form a toner image, a transferring unit that transfers the toner image to a first side of a recording medium, a fixing unit that allows the recording medium having the transferred toner image to pass through a nipping region to fix the toner image, a first charging unit that faces the first side of the recording medium and that charges particles, and a second charging unit that charges a second side of the recording medium to the opposite polarity to the charged particles after the recording medium passes through the nipping region.

An image forming apparatus includes an image holding member, a charging unit that charges the surface of the image holding member, an electrostatic latent image forming unit that forms an electrostatic latent image on the charged surface of the image holding member, a developing unit that includes a developer containing toner particles containing a release agent having a melting temperature ranging from 60&#xb0; C. to 100&#xb0; C. and that develops the electrostatic latent image on the surface of the image holding member with the developer to form a toner image, a transferring unit that transfers the toner image to a recording medium, a fixing unit that includes two members of which the outer surfaces are in contact with each other to form a nipping region and of which at least one member is a belt member and that allows the recording medium having the transferred toner image to pass through the nipping region to fix the toner image to the recording medium, a particle charging unit that is disposed in the vicinity of the nipping region and upstream of the nipping region in the transport direction of the recording medium so as to face the toner-image-formed side of the recording medium and that charges particles, and a particle collecting unit that is disposed near the particle charging unit and that is charged to the opposite polarity to the charged particles.

An image forming apparatus includes an image holding member, a developing device, and a supplying device including a storage unit and a transport unit, wherein the storage unit stores toner and includes a bag having a flexible material, the transport unit uses suction pressure to transport the toner from the storage unit and supplies to the developing device, the toner contains an amorphous polyester resin, toner particles of the toner have a weight average molecular weight Mw and a number average molecular weight Mn, the weight average molecular weight Mw is in a range of 25,000 to 60,000, a ratio Mw/Mn is in a range the range of 5 to 10, a ratio (P2/P1) of a peak height of an absorption peak of the toner particles at a wavenumber of 820 cm(P2) to a peak height of the absorption peak at a wavenumber of 720 cm(P1) is 0.4 or less, and a ratio (P3/P1) of a peak height of the absorption peak of the toner particles at a wavenumber of 1500 cm(P3) to the peak height of the absorption peak at the wavenumber of 720 cm(P1) is 0.6 or less.

Image forming apparatus comprising a supplying device including a storage and a transport unit

An image forming apparatus includes an image holding member, a charging device that charges a surface of the image holding member, an electrostatic charge image forming device that forms an electrostatic charge image on the charged surface of the image holding member, a developing device that has an electrostatic charge image developer containing an electrostatic charge image developing toner and that develops the electrostatic charge image to form a toner image on the surface of the image holding member, and a transfer device that transfers the toner image onto a recording medium, wherein the transfer device includes a belt member and a transfer member, the belt member has an outer surface that contacts the image holding member, and the belt member is winding around the image holding member and the transfer member; and the toner has a binder resin containing an amorphous polyester resin.

An image forming apparatus includes an image holding member, a charging unit, an electrostatic charge image forming unit, a developing unit, a transfer unit, and a cleaning unit having a cleaning blade that is in contact with the surface of the image holding member to clean the surface of the image holding member, wherein in the cleaning device, a variation in a load applied by the cleaning blade to the image holding member in a slide test is 1.5 gf/mm or less, wherein in the slide test, an image holding member which has a diameter of 30 mm and with which the cleaning blade is in contact at a contact angle of 23&#xb0; and a pressing pressure of 4.0 gf/mm is rotated 100,000 times at a rotational speed of 175 mm/sec to slide the cleaning blade.

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Kanagawa, Japan

Teppei Yawada