Patents by Inventor Takafumi Iwamoto
Takafumi Iwamoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230219115Abstract: coating film having excellent adhesion, even without the presence of a chemical conversion film treatment out as an undercoat and a metal automotive part having the coating film. A powder is deposited by powder-coating onto the surface of a metal automotive part that has been quenched after simultaneously forging, and tempering the metal automotive part and bake-hardening the deposited powder to form a skin film on the surface of the metal automotive part. The surface of the metal automotive part before the powder is powder-coated thereon is a work-hardened material surface that has been not been subjected to a chemical conversion filming treatment.Type: ApplicationFiled: December 7, 2022Publication date: July 13, 2023Inventors: Takafumi IWAMOTO, Kazuhiko YOSHIDA, Masato CHOKYU, Shintaro SUZUKI, Hiromi HAYASHI
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Publication number: 20190217334Abstract: The invention provides a coating film having excellent adhesion, even without a chemical conversion film treatment being carried out as an undercoat treatment, and a metal automotive part having the coating film. A powder is deposited by powder-coating onto the surface of a metal automotive part that has been quenched after forging, and tempering of the metal automotive part and bake-hardening of the deposited powder are carried out simultaneously, thereby forming a skin film on the surface of the metal automotive part. The surface of the metal automotive part before the powder is powder-coated thereon is a work-hardened basis material surface that has been not subjected to a chemical conversion filming treatment.Type: ApplicationFiled: March 20, 2019Publication date: July 18, 2019Inventors: Takafumi IWAMOTO, Kazuhiko YOSHIDA, Masato CHOKYU, Shintaro SUZUKI, Hiromi HAYASHI
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Patent number: 9298113Abstract: An electrophotographic photoconductor, including: an electroconductive substrate; and at least a photoconductive layer and a surface layer in this order over the electroconductive substrate, wherein the surface layer includes a resin having no charge transport properties, and first inorganic fine particles, and wherein the first inorganic fine particles are inorganic fine particles having surfaces modified with at least one of a primary amino group and a secondary amino group, and a volume resistivity of the first inorganic fine particles is 1×108 ?·cm or less.Type: GrantFiled: January 15, 2014Date of Patent: March 29, 2016Assignee: Ricoh Company, Ltd.Inventors: Toshihiro Ishida, Hiroshi Ikuno, Tetsuya Toshine, Naohiro Toda, Takafumi Iwamoto, Kazuhiro Egawa
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Patent number: 9122183Abstract: An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer overlying the electroconductive substrate; and a surface layer overlying the photosensitive layer, wherein the surface layer includes a resin having no charge transportability; and an inorganic particulate material, wherein the inorganic particulate material is a zinc oxide doped with a boron group, and wherein the electrophotographic photoreceptor has a surface specific resistivity (R1) not less than 1013 ?/cm2 when the surface layer has an electric field intensity of 1×104 V/cm, and a ratio (R1/R15) of the surface specific resistivity (R1) to a surface specific resistivity (R15) when the surface layer has an electric field intensity of 1.5×105 V/cm of from 100 to 5,000.Type: GrantFiled: March 5, 2013Date of Patent: September 1, 2015Assignee: Ricoh Company, Ltd.Inventors: Tetsuya Toshine, Hiroshi Ikuno, Naohiro Toda, Takafumi Iwamoto, Kazuhiro Egawa, Toshihiro Ishida
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Publication number: 20150217329Abstract: The invention provides a coating film having excellent adhesion, even without a chemical conversion film treatment being carried out as an undercoat treatment, and a metal automotive part having the coating film. A powder is deposited by powder-coating onto the surface of a metal automotive part that has been quenched after forging, and tempering of the metal automotive part and bake-hardening of the deposited powder are carried out simultaneously, thereby forming a skin film on the surface of the metal automotive part. The surface of the metal automotive part before the powder is powder-coated thereon is a work-hardened basis material surface that has been not subjected to a chemical conversion filming treatment.Type: ApplicationFiled: August 9, 2013Publication date: August 6, 2015Inventors: Takafumi Iwamoto, Kazuhiko Yoshida, Masato Chokyu, Shintaro Suzuki, Hiromi Hayashi
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Patent number: 8867960Abstract: An image forming apparatus including an image bearing member having a surface layer A having a surface hardness of 200 N/mm2 or greater, the surface layer A containing fillers made of a metal oxide and a cleaning blade having a reed-like elastic blade having a front edge portion to remove toner from the surface layer A in motion while the front edge portion is in contact with the surface layer A, the front edge portion having a laminate structure formed of a substrate of the elastic blade, a mixed layer of the substrate and an acrylic and/or methacrylic resin, the mixed layer having a thickness of 1.0 ?m or greater, and a surface layer B having an acrylic and/or methacrylic resin, the surface layer B having a thickness of 0.1 ?m or greater.Type: GrantFiled: March 4, 2013Date of Patent: October 21, 2014Assignee: Ricoh Company, Ltd.Inventors: Naohiro Toda, Takafumi Iwamoto, Toshihiro Ishida, Tetsuya Toshine, Yohta Sakon, Masahiro Ohmori
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Publication number: 20140199620Abstract: An electrophotographic photoconductor, including: an electroconductive substrate; and at least a photoconductive layer and a surface layer in this order over the electroconductive substrate, wherein the surface layer includes a resin having no charge transport properties, and first inorganic fine particles, and wherein the first inorganic fine particles are inorganic fine particles having surfaces modified with at least one of a primary amino group and a secondary amino group, and a volume resistivity of the first inorganic fine particles is 1×108 ?·cm or less.Type: ApplicationFiled: January 15, 2014Publication date: July 17, 2014Inventors: Toshihiro ISHIDA, Hiroshi IKUNO, Tetsuya TOSHINE, Naohiro TODA, Takafumi IWAMOTO, Kazuhiro EGAWA
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Publication number: 20140064810Abstract: An image forming apparatus includes an electrophotographic photoreceptor; and a cleaning blade. The electrophotographic photoreceptor includes an outermost layer having a ten-point average roughness Rz of from 0.5 to 2.4 ?m and an average interval between concavities and convexities Sm of from 30 to 300 ?m, and the cleaning blade includes a reed-shaped elastic blade having a contact point to the electrophotographic photoreceptor. The contact point includes a substrate; a mixed layer overlying the substrate, including a material forming the substrate and at least one of an acrylic resin and a methacrylic resin and having a thickness not less than 1.0 ?m; and a surface layer overlying the mixed layer, including at least one of an acrylic resin and a methacrylic resin and having a thickness not less than 0.1 ?m.Type: ApplicationFiled: July 30, 2013Publication date: March 6, 2014Inventors: Takafumi Iwamoto, Hiroshi Ikuno, Tetsuya Toshine, Kazuhiro Egawa, Toshihiro Ishida, Yohta Sakon, Masahiro Ohmori, Naohiro Toda
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Patent number: 8637216Abstract: An electrophotographic photoreceptor including an electroconductive substrate, a photosensitive layer, and a cured protection layer, wherein the cured protection layer comprises a cured material of a tri- or more functional radical polymerizable compound and a filler exposed from the surface of the cured protection layer which comprises a bump along the surface of the filler, and wherein the cured protection layer has a thickness (T) larger than a diameter (2r) of the filler therein and the following relationships (a) is satisfied: (the number of the fillers present to a depth of T/2 from a free surface of the cured protection layer/the total number of the fillers in the cured protection layer)×100?7%??(a).Type: GrantFiled: October 13, 2011Date of Patent: January 28, 2014Assignee: Ricoh Company, Ltd.Inventors: Takafumi Iwamoto, Naohiro Toda, Chieko Yamazaki
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Patent number: 8617778Abstract: An image bearing member including an electroconductive substrate, a charge generation layer, a charge transport layer and, a cross-linked type charge transport layer, the cross-linked type charge transport layer having a structure unit deriving from a first component, a second component, and a third component, the first component containing a copolymer having a cyclic structure and/or a structure represented by a Chemical structure 1 as a repeating unit, where Ra represents a hydrogen atom or methyl group and Rb represents a straight-chained saturated aliphatic hydrocarbon group having 8 to 34 carbon atoms, the second component containing at least one of a radical polymerizable monomer and a radical polymerizable oligomer without a charge transport structure, and the third component containing one or more kinds of radical polymerizable compounds having a charge transport structure.Type: GrantFiled: December 28, 2010Date of Patent: December 31, 2013Assignee: Ricoh Company, Ltd.Inventors: Takafumi Iwamoto, Naohiro Toda
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Patent number: 8568945Abstract: An electrophotographic photoreceptor, including a charge generation layer and a charge transport layer on an electroconductive substrate, wherein the charge generation layer includes titanylphthalocyanine and a binder resin which is a crosslinked material of a resin comprising a polyvinylbutyrat site having the following formula (1) and an isocyanate compound having the following formula (2): wherein R1 and R2 independently represent an alkyl group having 1 to 3 carbon atoms; k, l, m and n represent composition ratios and k+1 is from 0.60 to 0.80, wherein k or 1 may be 0, m is from 0.02 to 0.03, and n is from 0.20 to 0.40; wherein A represents a substituted or unsubstituted organic group having 2 to 4 valences; and O represents an integer of from 2 to 4.Type: GrantFiled: November 25, 2009Date of Patent: October 29, 2013Assignee: Ricoh Company, Ltd.Inventors: Hiromi Tada, Naohiro Toda, Yuuji Tanaka, Norio Nagayama, Yoshinori Inaba, Takafumi Iwamoto
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Publication number: 20130244150Abstract: An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer overlying the electroconductive substrate; and a surface layer overlying the photosensitive layer, wherein the surface layer includes a resin having no charge transportability; and an inorganic particulate material, wherein the inorganic particulate material is a zinc oxide doped with a boron group, and wherein the electrophotographic photoreceptor has a surface specific resistivity (R1) not less than 1013 ?/cm2 when the surface layer has an electric field intensity of 1×104 V/cm, and a ratio (R1/R15) of the surface specific resistivity (R1) to a surface specific resistivity (R15) when the surface layer has an electric field intensity of 1.5×105 V/cm of from 100 to 5,000.Type: ApplicationFiled: March 5, 2013Publication date: September 19, 2013Inventors: Tetsuya Toshine, Hiroshi Ikuno, Naohiro Toda, Takafumi Iwamoto, Kazuhiro Egawa, Toshihiro Ishida
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Publication number: 20130243484Abstract: An image forming apparatus including an image bearing member having a surface layer A having a surface hardness of 200 N/mm2 or greater, the surface layer A containing fillers made of a metal oxide and a cleaning blade having a reed-like elastic blade having a front edge portion to remove toner from the surface layer A in motion while the front edge portion is in contact with the surface layer A, the front edge portion having a laminate structure formed of a substrate of the elastic blade, a mixed layer of the substrate and an acrylic and/or methacrylic resin, the mixed layer having a thickness of 1.0 ?m or greater, and a surface layer B having an acrylic and/or methacrylic resin, the surface layer B having a thickness of 0.1 ?m or greater.Type: ApplicationFiled: March 4, 2013Publication date: September 19, 2013Applicant: RICOH COMPANY, LTD.Inventors: Naohiro Toda, Takafumi Iwamoto, Toshihiro Ishida, Tetsuya Toshine, Yohta Sakon, Masahiro Ohmori
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Patent number: 8535862Abstract: An electrophotographic photoreceptor including a conductive substrate, a photosensitive layer located overlying the conductive substrate, and a hardened protective layer located overlying the photosensitive layer. The hardened protective layer comprises a hardened material of a hardenable composition comprising a radical-polymerizable compound (A) having a charge transport structure and a radical-polymerizable compound (B) having an adamantane skeleton.Type: GrantFiled: June 6, 2011Date of Patent: September 17, 2013Assignee: Ricoh Company, Ltd.Inventors: Takafumi Iwamoto, Naohiro Toda
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Patent number: 8518618Abstract: To provide an electrophotographic photoconductor, containing: a conductive support; a photosensitive layer provided above the conductive support; and a hardened protective layer provided above the photosensitive layer, wherein the hardened protective layer contains a hardened product of a radical polymerizable compound containing an adamantane skeleton.Type: GrantFiled: June 29, 2011Date of Patent: August 27, 2013Assignee: Ricoh Company, Ltd.Inventors: Takafumi Iwamoto, Naohiro Toda, Yoshitaka Uenoyama, Hidetoshi Ono
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Patent number: 8512436Abstract: There is provided a method for efficiently manufacturing metal nano particles without condensing laser beams by using a lens etc. In this method, first, metallic foil pieces, which are a starting material, are dispersed in a dispersion liquid. Next, laser beams are irradiated directly to the metallic foil pieces without providing a condensing means, by which many metal fine particles are yielded. The particle diameters of the metal fine particles obtained can be controlled to sizes from nano particles to submicron particles by utilizing the relationship between the shape (especially thickness) of the metallic foil piece which is a starting material and the absorbed energy of the laser beam.Type: GrantFiled: August 22, 2005Date of Patent: August 20, 2013Assignees: Kyoto University, Fukuda Metal Foil & Powder Co., Ltd., Hitachi Chemical Company, Ltd.Inventors: Mitsuo Kawasaki, Osamu Kajita, Ayu Onishi, Sachiko Masuoka, Takafumi Iwamoto, Eitaro Yasuda
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Publication number: 20130137022Abstract: An image bearing member includes a substrate, a photosensitive layer overlying the substrate, and a surface protective layer overlying the photosensitive layer and having a surface comprising multiple concave structures with a maximum diameter of from 1 ?m to 3 ?m and a maximum depth of from 10 nm to 50 nm. Any one of the concave structures has at least one other concave structure within 3 ?m thereof.Type: ApplicationFiled: November 8, 2012Publication date: May 30, 2013Inventors: Naohiro TODA, Takafumi IWAMOTO
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Patent number: 8273149Abstract: The present invention provides a nanowire production method that is simpler than conventional nanowire production methods, and that makes it easier to control the size and shape of the nanowires by using a technique completely different from the conventional ones. A powder particle containing a metal element is divided into nanometer-size wires containing the metal element by irradiating a suspension of the powder particles with a femtosecond laser. The present invention also makes it possible to divide the nanometer-size wires thus formed into nanometer-size particles containing the metal element by irradiating further the nanometer-size wires with the femtosecond laser.Type: GrantFiled: June 20, 2007Date of Patent: September 25, 2012Assignee: Kyoto UniversityInventors: Yasuhiko Shimotsuma, Kiyotaka Miura, Kazuyuki Hirao, Mitsuo Kawasaki, Osamu Kajita, Takafumi Iwamoto, Eitaro Yasuda, Shigeyuki Kimura
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Patent number: 8178266Abstract: An electrophotographic photoreceptor is provided that contains a conductive substrate, an undercoat layer, a charge generation layer, and a charge transport layer, wherein the under coat layer contains a binder resin and multiple inorganic pigments each having different average primary particle diameters in a total amount of from 75 to 86% by weight, the charge generation layer contains a binder resin and a titanyl phthalocyanine pigment having a specific X-ray diffraction spectrum in an amount of from 70 to 85% by weight, the charge transport layer comprises a specific distyryl compound, and the following formulae (2-1) to (2-3) are satisfied: 0.2?(D(F2)/D(G))?0.5??(2-1) 0.2?D(F1)??(2-2) D(F2)?D(F1)??(2-3) wherein D(F1) (?m) and D(F2) (?m) represent average primary particle diameters of the largest and smallest inorganic pigments, respectively, and D(G) (?m) represents an average primary particle diameter of the titanyl phthalocyanine pigment.Type: GrantFiled: June 23, 2009Date of Patent: May 15, 2012Assignee: Ricoh Company, Ltd.Inventors: Hiromi Tada, Nozomu Tamoto, Tomoyuki Shimada, Takafumi Iwamoto
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Publication number: 20120100473Abstract: An electrophotographic photoreceptor including an electroconductive substrate, a photosensitive layer, and a cured protection layer, wherein the cured protection layer comprises a cured material of a tri- or more functional radical polymerizable compound and a filler exposed from the surface of the cured protection layer which comprises a bump along the surface of the filler, and wherein the cured protection layer has a thickness (T) larger than a diameter (2r) of the filler therein and the following relationships (a) is satisfied: (the number of the fillers present to a depth of T/2 from a free surface of the cured protection layer/the total number of the fillers in the cured protection layer)×100?7%??(a).Type: ApplicationFiled: October 13, 2011Publication date: April 26, 2012Applicant: RICOH COMPANY, LTDInventors: Takafumi IWAMOTO, Naohiro Toda, Chieko Yamazaki