Konica Minolta, Inc.

Konica Minolta Business Technologies, Inc.

Keiichi Inagaki

Daisuke Kodama

Shigeaki Tokutake

Toshiyuki Fujita

Mari Konishi

Masao Asano

Seijiro Takahashi

Hiroshi Nakahara

Hiroshi Yamazaki

Takeshi Ishida

Akihiko Itami

Kazuteru Ishizuka

Nobuaki Kobayashi

Kunihiro Ogura

Hideo Yoshizawa

Masanori Yumita

Hiroshige Kidera

Mari Ueda

Chigusa Yamane

Provided is a means in which in a tandem type electrophotographic image forming apparatus, image deletion of a formed image is suppressed, passing through of a toner is suppressed, and the lifetime of an organic photoreceptor and the apparatus itself is prolonged. The invention relates to a tandem type electrophotographic image forming apparatus using an organic photoreceptor in which at least a charge generating layer and a charge transfer layer are sequentially laminated on a conductive support body, in which in at least one of combinations of two adjacent image forming units including toners having colors different from each other, a linear pressure P1 of a cleaning blade A included in the image forming unit disposed on an upstream side, and a linear pressure P2 of a cleaning unit blade B included in the image forming unit disposed on a downstream side, satisfy a predetermined relationship.

Electrophotographic image forming apparatus

A tandem type electrophotographic image forming device using an organic photoreceptor, includes a plurality of image forming units each including at least: an electrostatic latent image former; a developer; a lubricant supplier; and a cleaner, wherein at least one combination composed of the two adjacent image forming units including toners having different colors satisfies the following formula (1) if a universal hardness of an organic photoreceptor A included in the image forming unit disposed on an upstream side is represented by Ha, and a universal hardness of an organic photoreceptor B included in the image forming unit disposed on a downstream side is represented by Hb.[Numerical formula 1]10 N/mm&#x2003;&#x2003;(1)

Electrophotographic image forming device

A electrophotographic image forming device using an organic photoreceptor, includes a plurality of image forming units each including at least: an electrostatic latent image former; a developer; a lubricant supplier; and a cleaner including a cleaning blade and a cleaning assist brush, wherein at least one combination composed of two adjacent image forming units including toners having different colors satisfies the following formula (1) if a ratio of a circumferential speed of the cleaning assist brush with respect to a circumferential speed of an organic photoreceptor included in an image forming unit A is represented by &#x3b8;1 and a ratio of a circumferential speed of the cleaning assist brush with respect to a circumferential speed of an organic photoreceptor included in an image forming unit B is represented by &#x3b8;2.[Numerical formula 1]&#x3b8;2&#x3e;&#x3b8;1&#x2003;&#x2003;(1)

Provided is an electrophotographic photoreceptor including a conductive support having thereon an intermediate layer, a charge generating layer, a charge transporting layer, and a protective layer sequentially laminated in that order, wherein the intermediate layer contains rutile type titanium oxide particles, and 50% or more of the rutile type titanium oxide particles have an organic compound on a surface of the titanium oxide particles; the charge generating layer has a pigment containing a 2,3-butanediol adduct of a phthalocyanine compound; the charge transporting layer contains a charge transporting material having an ionization potential of 5.45 to 5.60 eV; and the protective layer contains metal oxide particles and the charge transporting material in a cured resin prepared by curing a polymerizable compound.

Electrophotographic photoreceptor and image-forming apparatus

An electrophotographic image forming apparatus using an organic photoreceptor in which at least a charge generation layer, a charge transport layer, and a protective layer are laminated in order on a conductive support includes at least a unit for supplying a lubricant onto a surface of the organic photoreceptor and a unit for removing toner remaining on the surface of the organic photoreceptor with a cleaning blade, and satisfying the following conditions (1) to (3): (1) the protective layer of the organic photoreceptor contains at least metal oxide fine particles in a cured resin obtained by curing a polymerizable compound; (2) a universal hardness of the surface of the organic photoreceptor is in a range of 220 to 280 N/mm; and (3) a JIS-A hardness of a portion of the cleaning blade to be abutted on the organic photoreceptor is in a range of 70 to 78&#xb0;.

Electrophotographic image forming apparatus containing organic photoreceptor, unit for supplying lubricant, and cleaning blade

An imaging apparatus including: an electrophotographic photoreceptor; a charging unit to charge the surface of the electrophotographic photoreceptor; an exposing unit to perform exposure of the electrophotographic photoreceptor charged by the charging unit; a developing unit to feed a toner to the electrophotographic photoreceptor exposed by the exposing unit to form a toner image; a transfer unit to transfer the toner image formed on the electrophotographic photoreceptor; a lubricant feeding unit to feed a lubricant onto the surface of the electrophotographic photoreceptor; and a cleaning unit to remove the residual toner on the surface of the electrophotographic photoreceptor, wherein the electrophotographic photoreceptor includes a conductive support, a photoreceptive layer, and a protective layer disposed in sequence, the protective layer includes a resin containing a particulate P-type semiconductor, and the protective layer has a surface roughness Rz of 0.030 &#x3bc;m or more and 0.075 &#x3bc;m or less.

Imaging apparatus and process of forming image with electrophotographic photoreceptor having protective layer containing particulate P-type semiconductor

An electrophotographic photoreceptor includes: a conductive holder; and at least a charge producing layer and a charge transport layer disposed on the conductive holder in order. The charge transport layer contains at least a binder resin, a charge transport agent and a p-type metal oxide particle.

Electrophotographic photoreceptor, electrophotographic image forming method and electrophotographic image forming apparatus

In an organic photoreceptor that has a protective layer formed on an organic photosensitive layer, the protective layer contains; a cured resin constituent obtained by polymerizing a polymerizable compound in the presence of a radical scavenger represented by the general formula (2); metal oxide microparticles; and a compound represented by the general formula (1) as a charge transport substance, and the relational expression (1): 80/A&#x2266;B&#x2266;160/A and the relational expression (2): 12&#x2266;A&#x2266;25 are satisfied when the volume ratio (volume %) of the metal oxide microparticles in the protective layer and the volume ratio (volume %) of the compound represented by the general formula (1) in the protective layer are respectively denoted by A and B.

Organic photoreceptor, image forming apparatus, and image forming method

The invention provides a means for improving the abrasion resistance and the scratch resistance of a protection layer by increasing the surface hardness of the protection layer of an organic photoreceptor. The invention is an organic photoreceptor constituted by laminating on an electroconductive substrate, a photosensitive layer and a protection layer successively, wherein the protection layer comprises a charge transport substance represented by the following general formula (1), a resin component obtained by curing a curable compound and tin oxide treated with a surface preparation agent having a reactive organic group, and a silica particle: 

Organic photoreceptor

An image forming method is disclosed, the method includes forming a latent image by irradiating an organic photoreceptor by a semiconductor laser or a light emission diode emitting light of a wavelength of from 350 to 500 nm, and developing the latent image by a developer containing a toner to form a toner image, the organic photoreceptor having a surface layer comprising a binder and fluororesin fine particles having an average primary particle diameter of not less than 0.02 &#x3bc;m and less than 0.20 &#x3bc;m.

Image forming method, a processing cartridge and an image forming method using the same

An embodiment may be an organic photoreceptor, which comprises a conductive support; a photosensitive layer provided on the conductive support; and a surface layer containing a binder and a fluorine-containing resin fine particle having a number average primary particle diameter between about 0.02 &#x3bc;m and about 0.20 &#x3bc;m and a crystallinity of less than 90% and a binder resin; wherein a contact angle of the surface layer for water is 90&#xb0; or more and a dispersion of the contact angle is within &#xb1;2.0&#xb0;.

Organic photoconductor, manufacturing method thereof, and process cartridge and image formation apparatus using the same photoconductor

An image forming apparatus has an organic photoconductor having a surface layer containing fluorine-containing resin particles whose number average primary particle size is not less than 0.02 &#x3bc;m and is less than 0.20 &#x3bc;m; a charging device to charge by bring an charging member in contact with the organic photoconductor; a latent image forming device to for a latent image on the organic photoconductor; a developing device to visualize the latent image with toner and to form a toner image on the organic photoconductor; and a transferring device to transfer the toner onto a transfer material.

Organic photoconductor, process cartridge and image forming apparatus both employing the same

An electrophotographic photoreceptor including a charge generating layer and a charge transfer layer accumulated on a support member, the charge transfer layer including at least two layers of a support side layer and a surface side layer, wherein the support side layer contains A mol/cmof charge mol/cmof charge transfer material having a dipolar moment of not more than 0.75 and inorganic particles having a number average primary particle diameter of 3-150 nm, wherein A and B satisfies relations of (1) and (2),9.0&#xd7;10&#x2003;&#x2003;(1)8.0&#xd7;10&#x2003;&#x2003;(2).

Electrophotographic photoreceptor with two layer charge transfer layer, and apparatus utilizing the same

A photoconductor for electrophotography, includes a conductive substrate; a photosensitive layer containing charge generation material formed on the conductive substrate. The charge generation material contains a substituted or unsubstituted gallium phthalocyanine dimer (GaPhC dimmer) and a substituted or unsubstituted hydroxy gallium phthalocyanine (GaPhC monomer) and has distinctive diffraction peaks at the Bragg angles (2&#x3b8;&#xb1;0.2) of 7.5&#xb0; and 28.3&#xb0; in a Cu-K&#x3b1; characteristic X-ray diffraction spectrum.

Photoconductor for electrophotography

An image forming method comprising the steps of; forming a latent image by exposing an organic photoreceptor to light, and An embodiment may be an organic photoreceptor, which comprises a conductive support; a photosensitive layer provided on the conductive support; and a surface layer containing a binder and a fluorine-containing resin fine particle having a number average primary particle diameter between about 0.02 &#x3bc;m and about 0.20 &#x3bc;m and a crystallinity of less than 90% and a binder resin; wherein a contact angle of the surface layer for water is 90&#xb0; or more and an absolute value of variation of the contact angle is within 2.2&#xb0;.

Growing community of inventors

Hino, Japan

Keiichi Inagaki