Patents by Inventor Takehiko Aoyama
Takehiko Aoyama 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).
-
Publication number: 20250214270Abstract: This is a blade-rubber regeneration device including a blade portion for cutting off the tip end of a lip portion of the blade rubber in a longitudinal direction of the blade rubber, the regeneration device cutting off a part of the tip end of the lip portion by relatively moving the blade portion from an end part A, which is one of end parts in the longitudinal direction of the blade rubber toward an end part B, which is the other end part, and the regeneration device including a sandwiching member of sandwiching the lip portion and a pressing member for pressing the tip end of the lip portion, the sandwiching member sandwiching at least a part of the lip portion from both side portions of the lip portion under a specific condition, and the pressing member pressing the tip end of the lip portion prior to the movement.Type: ApplicationFiled: March 21, 2025Publication date: July 3, 2025Inventors: KATSUYA KODAMA, HIDEKAZU MATSUDA, TAKEHIKO AOYAMA, TAKAYUKI MIZUNUMA
-
Patent number: 12174576Abstract: Provided is a cleaning member, comprising an elastic member that includes polyurethane, wherein: when tan ? of a test piece sampled from the elastic member is measured in the temperature range of ?20° C. to +60° C., the peak temperature of a peak indicating the maximum value of tan ? is at 15.0° C. or below; the maximum value of tan ? is 0.20 to 0.55; tan ? at a temperature of 55° C. is 0.13 or larger; and where the detected quantity of all ions obtained when the test piece is heated at a rate of temperature increase of 10° C./second to 1000° C. using a direct-sampling mass spectrometer is M1 and the integrated intensity of a peak in a derived ion thermogram that corresponds to a range of m/z values originating in multifunctional isocyanate with at least three isocyanate groups is M2, M2/M1 is at least 0.001.Type: GrantFiled: November 27, 2023Date of Patent: December 24, 2024Assignee: Canon Kabushiki KaishaInventors: Masanori Yokoyama, Kenya Terada, Takehiko Aoyama, Shota Segawa, Hisao Kato, Mitsuhiro Kunieda, Arihiro Yamamoto
-
Publication number: 20240359660Abstract: A wiper device for a windshield, the device including a wiper arm, and a wiper blade mounted on the wiper arm, wherein the wiper blade includes a blade rubber and a blade stay which supports the blade rubber, the blade rubber includes: a base which is a part of the blade rubber to be mounted on the blade stay; a lip; and a neck which swingably connects the lip to the base, wherein at least a portion of the tip of the lip constitutes a contact part with a windshield, abuts the wiper arm to a glass flat plate and moves the glass flat plate, and in a stop state, the width of the contact part of the blade rubber and the glass flat plate is 1.0 20.0 ?m, and an angle ? between a specific position of the lip and the glass flat plate is 20° to 80°.Type: ApplicationFiled: June 17, 2024Publication date: October 31, 2024Inventors: TAKEHIKO AOYAMA, HIDEKAZU MATSUDA, KATSUYA KODAMA, NAO HIGUCHI, TAKAYUKI MIZUNUMA
-
Publication number: 20240111241Abstract: Provided is a cleaning member, comprising an elastic member that includes polyurethane, wherein: when tan ? of a test piece sampled from the elastic member is measured in the temperature range of ?20° C. to +60° C., the peak temperature of a peak indicating the maximum value of tan ? is at 15.0° C. or below; the maximum value of tan ? is 0.20 to 0.55; tan ? at a temperature of 55° C. is 0.13 or larger; and where the detected quantity of all ions obtained when the test piece is heated at a rate of temperature increase of 10° C./second to 1000° C. using a direct-sampling mass spectrometer is M1 and the integrated intensity of a peak in a derived ion thermogram that corresponds to a range of m/z values originating in multifunctional isocyanate with at least three isocyanate groups is M2, M2/M1 is at least 0.001.Type: ApplicationFiled: November 27, 2023Publication date: April 4, 2024Inventors: MASANORI YOKOYAMA, KENYA TERADA, TAKEHIKO AOYAMA, SHOTA SEGAWA, HISAO KATO, MITSUHIRO KUNIEDA, ARIHIRO YAMAMOTO
-
Patent number: 11945414Abstract: A vehicle windshield wiper blade comprising: a blade support portion; and a lip portion, wherein the lip portion has a tapered portion having a cross section that is taken along a direction perpendicular to the longitudinal direction of the wiper blade and that has a width that gradually decreases from a side closer to the blade support portion towards a direction farthest away from the blade support portion, the lip portion has a tip surface and first and second tapered surfaces constituting the tapered portion, and, in a specific observation region of the first and second tapered surfaces, the average value of the elastic modulus measured at a 0.1 ?m pitch is 15-470 MPa and the coefficient of variation of the elastic modulus is at most 17.6%.Type: GrantFiled: January 24, 2023Date of Patent: April 2, 2024Assignee: Canon Kabushiki KaishaInventors: Takehiko Aoyama, Masanori Yokoyama, Syoji Inoue, Arihiro Yamamoto, Hidekazu Matsuda, Shota Segawa
-
Publication number: 20230157493Abstract: A wiper blade comprising: a hand grip portion; and an elastic portion supported by the hand grip portion and that is pressed against a surface to be cleaned; the elastic portion having, on a tip side, a main surface opposing a member to be cleaned, and a tip surface that forms a tip side edge together with the main surface, and in a specific observation region of the tip surface and the main surface, the average value of elastic modulus values obtained through measurement at a 0.1 ?m pitch being 15 MPa to 470 MPa, and the coefficient of variation of the elastic modulus being 17.6% or less.Type: ApplicationFiled: January 24, 2023Publication date: May 25, 2023Inventors: TAKEHIKO AOYAMA, HIDEKAZU MATSUDA, SYOJI INOUE, ARIHIRO YAMAMOTO, MASANORI YOKOYAMA, SHOTA SEGAWA
-
Publication number: 20230159001Abstract: A vehicle windshield wiper blade comprising: a blade support portion; and a lip portion, wherein the lip portion has a tapered portion having a cross section that is taken along a direction perpendicular to the longitudinal direction of the wiper blade and that has a width that gradually decreases from a side closer to the blade support portion towards a direction farthest away from the blade support portion, the lip portion has a tip surface and first and second tapered surfaces constituting the tapered portion, and, in a specific observation region of the first and second tapered surfaces, the average value of the elastic modulus measured at a 0.1 ?m pitch is 15-470 MPa and the coefficient of variation of the elastic modulus is at most 17.6%.Type: ApplicationFiled: January 24, 2023Publication date: May 25, 2023Inventors: TAKEHIKO AOYAMA, MASANORI YOKOYAMA, SYOJI INOUE, ARIHIRO YAMAMOTO, HIDEKAZU MATSUDA, SHOTA SEGAWA
-
Publication number: 20230159692Abstract: A vehicle wiper blade comprises a blade support part and a lip part coupled swingably with the blade support part via a neck. The lip part comprises polyurethane. The polyurethane comprises a reactant of a composition including an isocyanate compound which includes diisocyanate and tri- or higher functional polyfunctional isocyanate, and an alcohol which includes tri- or higher functional polyfunctional alcohol. The diisocyanate has an aromatic ring in a molecule. When a molecule of the polyurethane is ionized with a mass spectrometer of a direct sample injection system, then obtained M1, M2 and M3 satisfy the following relation: M2/M1 is 0.001 to 0.028, M3/M1 is 0.020 to 0.110, and M2/M3 is 0.013 to 0.300, and a concentration of the polyfunctional alcohol in the polyurethane is 0.12 mmol/g to 0.65 mmol/g.Type: ApplicationFiled: January 24, 2023Publication date: May 25, 2023Inventors: SHOTA SEGAWA, TAKEHIKO AOYAMA, MASANORI YOKOYAMA, HIDEKAZU MATSUDA, SYOJI INOUE, ARIHIRO YAMAMOTO, YOUHEI IKEDA
-
Publication number: 20230157492Abstract: A cleaning wiper blade comprises a hand grip part and an elastic part. The elastic part comprises a polyurethane. The polyurethane comprises a reactant of a composition including an isocyanate compound which includes diisocyanate and polyfunctional isocyanate, and an alcohol which includes polyfunctional alcohol. The diisocyanate has an aromatic ring in a molecule. When a molecule of the polyurethane is ionized with a mass spectrometer of a direct sample injection system, then obtained M1, M2 and M3 satisfy the is 0.013 to 0.300, and a concentration of the polyfunctional alcohol in the polyurethane is 0.12 mmol/g to 0.65 mmol/g.Type: ApplicationFiled: January 24, 2023Publication date: May 25, 2023Inventors: SHOTA SEGAWA, TAKEHIKO AOYAMA, MASANORI YOKOYAMA, HIDEKAZU MATSUDA, SYOJI INOUE, ARIHIRO YAMAMOTO
-
Patent number: 10025216Abstract: Provided is a charging member capable of suppressing the occurrence of an image defect due to the non-uniform abrasion of a photosensitive member and a stain, in a long-term use. The charging member includes an electro-conductive elastic layer as a surface layer. The electro-conductive elastic layer contains a binder and a bowl-shaped resin particle having an opening. The surface of the charging member has a concavity and a protrusion derived from the bowl-shaped resin particle. The relations represented by the following formulae are satisfied, 0.2 ? S = ? S ? ? 5 - S ? ? 1 ? S ? ? 1 ? 0.5 0.15 ? d = ? d ? ? 5 - d ? ? 1 ? d ? ? 1 ? 0.Type: GrantFiled: March 30, 2016Date of Patent: July 17, 2018Assignee: Canon Kabushiki KaishaInventors: Atsushi Uematsu, Tomohito Taniguchi, Masahiro Watanabe, Noboru Miyagawa, Taichi Sato, Takehiko Aoyama
-
Publication number: 20180024460Abstract: Provided is a charging member capable of suppressing the occurrence of an image defect due to the non-uniform abrasion of a photosensitive member and a stain, in a long-term use. The charging member includes an electro-conductive elastic layer as a surface layer. The electro-conductive elastic layer contains a binder and a bowl-shaped resin particle having an opening. The surface of the charging member has a concavity and a protrusion derived from the bowl-shaped resin particle. The relations represented by the following formulae are satisfied, 0.2 ? S = ? S ? ? 5 - S ? ? 1 ? S ? ? 1 ? 0.5 0.15 ? d = ? d ? ? 5 - d ? ? 1 ? d ? ? 1 ? 0.Type: ApplicationFiled: March 30, 2016Publication date: January 25, 2018Applicant: Canon Kabushiki KaishaInventors: Atsushi Uematsu, Tomohito Taniguchi, Masahiro Watanabe, Noboru Miyagawa, Taichi Sato, Takehiko Aoyama
-
Patent number: 9678452Abstract: A roller for electrophotography including a mandrel and an elastic layer on the mandrel is provided. The elastic layer contains a hollow particle in a region from the surface of the elastic layer to a depth of 100 ?m. A cross-section of the hollow particle intersected by a first plane and a cross-section of the hollow particle intersected by a second plane each have a ratio of the length of the long axis to the length of the short axis of 1.2 or more and 1.9 or less.Type: GrantFiled: March 28, 2016Date of Patent: June 13, 2017Assignee: Canon Kabushiki KaishaInventors: Masahiro Watanabe, Tomohito Taniguchi, Noboru Miyagawa, Taichi Sato, Takehiko Aoyama, Takeshi Yoshidome, Atsushi Uematsu
-
Patent number: 9645517Abstract: The present invention directs to provide a charging member having a protrusion to which smear is difficult to adhere even in a long-term used, and as a result being capable of exhibiting stable charging performance. The charging member has an electro-conductive substrate and an electro-conductive surface layer, wherein the surface layer includes a binder resin and a resin particle including a plurality of electro-conductive domains inside thereof, the surface layer has a protrusion derived from the resin particle, and the electro-conductive domains are localized in the vicinity of the surface of the resin particle.Type: GrantFiled: July 22, 2014Date of Patent: May 9, 2017Assignee: Canon Kabushiki KaishaInventors: Taichi Sato, Tomohito Taniguchi, Takehiko Aoyama
-
Patent number: 9599914Abstract: The electrophotographic member includes an electro-conductive substrate and an electro-conductive resin layer as the surface layer on the substrate. The electro-conductive resin layer contains a binder and a bowl-shaped resin particle; the surface of electrophotographic member has a concavity derived from the opening of the bowl-shaped resin particle, a protrusion derived from the edge portion of the opening and the electro-conductive resin layer; and when the surface of the member is observed using a scanning electron microscope at an accelerating voltage (1 kV) and a magnification (×2000) while applying a DC voltage (50 to 100 V) between an electrode disposed opposite to the electrophotographic member and the substrate, the brightness of the protrusion, K1, the brightness of the bottom of the concavity, K2, and the brightness of the exposed surface of the electro-conductive resin layer, K3, satisfy K2<K1, K3<K1 and 0.8?K2/K3?1.2.Type: GrantFiled: March 22, 2016Date of Patent: March 21, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Atsushi Uematsu, Tomohito Taniguchi, Masahiro Watanabe, Noboru Miyagawa, Taichi Sato, Takehiko Aoyama, Takeshi Yoshidome
-
Publication number: 20160291497Abstract: A roller for electrophotography including a mandrel and an elastic layer on the mandrel is provided. The elastic layer contains a hollow particle in a region from the surface of the elastic layer to a depth of 100 ?m. A cross-section of the hollow particle intersected by a first plane and a cross-section of the hollow particle intersected by a second plane each have a ratio of the length of the long axis to the length of the short axis of 1.2 or more and 1.9 or less.Type: ApplicationFiled: March 28, 2016Publication date: October 6, 2016Inventors: Masahiro Watanabe, Tomohito Taniguchi, Noboru Miyagawa, Taichi Sato, Takehiko Aoyama, Takeshi Yoshidome, Atsushi Uematsu
-
Publication number: 20160291487Abstract: The electrophotographic member includes an electro-conductive substrate and an electro-conductive resin layer as the surface layer on the substrate. The electro-conductive resin layer contains a binder and a bowl-shaped resin particle; the surface of electrophotographic member has a concavity derived from the opening of the bowl-shaped resin particle, a protrusion derived from the edge portion of the opening and the electro-conductive resin layer; and when the surface of the member is observed using a scanning electron microscope at an accelerating voltage (1 kV) and a magnification (×2000) while applying a DC voltage (50 to 100 V) between an electrode disposed opposite to the electrophotographic member and the substrate, the brightness of the protrusion, K1, the brightness of the bottom of the concavity, K2, and the brightness of the exposed surface of the electro-conductive resin layer, K3, satisfy K2<K1, K3<K1 and 0.8?K2/K3?1.2.Type: ApplicationFiled: March 22, 2016Publication date: October 6, 2016Inventors: Atsushi Uematsu, Tomohito Taniguchi, Masahiro Watanabe, Noboru Miyagawa, Taichi Sato, Takehiko Aoyama, Takeshi Yoshidome
-
Patent number: 9335650Abstract: There are provided an image forming apparatus in which the generation of lateral streak images due to a decrease in the in-nip discharge intensity is suppressed while at the same time the generation of spot-like images due to abnormal discharge caused by smudges on the surface of a charging member is suppressed, and a process cartridge. The image forming apparatus and the process cartridge each has: a charging member containing a resin particle having a plurality of pores inside thereof; and a toner in which the coverage ratio X1 of a surface of the toner with silica fine particles is 50.0 area % or more and 75.0 area % or less, and when a theoretical coverage ratio with the silica fine particles is X2, a diffusion index represented by formula 1 satisfies formula 2. diffusion index=X1/X2??(formula 1) diffusion index??0.0042×X1+0.Type: GrantFiled: June 26, 2014Date of Patent: May 10, 2016Assignee: Canon Kabushiki KaishaInventors: Takehiko Aoyama, Tomohito Taniguchi, Noboru Miyagawa, Taichi Sato, Atsushi Uematsu, Masahiro Watanabe, Yoshitaka Suzumura
-
Patent number: 9304429Abstract: A charging member includes an electro-conductive substrate and an electro-conductive resin layer. The electro-conductive resin layer contains a binder, a plurality of bowl-shaped resin particles, and a plurality of hollow particles. The charging member has a surface having recesses due to openings of the bowl-shaped resin particles and protrusions due to edges of the openings of the bowl-shaped resin particles, where the positional relationship between one bowl-shaped resin particle and the hollow particles lying in the vicinity of the bowl-shaped resin particle is that the number of the hollow particles being in the space under the bowl-shaped resin particle in a predetermined depth is at least four in average.Type: GrantFiled: August 27, 2015Date of Patent: April 5, 2016Assignee: Canon Kabushiki KaishaInventors: Noboru Miyagawa, Tomohito Taniguchi, Masahiro Watanabe, Taichi Sato, Takehiko Aoyama, Atsushi Uematsu
-
Patent number: 9291936Abstract: There are provided an image-forming apparatus that inhibit the occurrence of a longitudinal streak image attributed to a cleaning failure, and a process cartridge. The image-forming apparatus and the process cartridge each have a charging member with a surface having a concavities derived from an opening of the bowl-shaped resin particle, and a protrusions derived from an edge of the opening of the bowl-shaped resin particle, the coverage ratio X1 of a surface of the toner with the silica fine particles is 50.0 area % or more and 75.0 area % or less, and when a theoretical coverage ratio of the toner by the silica fine particles is X2, a diffusion index represented by the formula 1 satisfies the formula 2: diffusion index=X1/X2??(formula 1) diffusion index??0.0042×X1+0.Type: GrantFiled: June 26, 2014Date of Patent: March 22, 2016Assignee: Canon Kabushiki KaishaInventors: Tomohito Taniguchi, Takehiko Aoyama, Taichi Sato, Noboru Miyagawa, Masahiro Watanabe, Atsushi Uematsu, Yoshitaka Suzumura
-
Publication number: 20160062259Abstract: A charging member includes an electro-conductive substrate and an electro-conductive resin layer. The electro-conductive resin layer contains a binder, a plurality of bowl-shaped resin particles, and a plurality of hollow particles. The charging member has a surface having recesses due to openings of the bowl-shaped resin particles and protrusions due to edges of the openings of the bowl-shaped resin particles, where the positional relationship between one bowl-shaped resin particle and the hollow particles lying in the vicinity of the bowl-shaped resin particle is that the number of the hollow particles being in the space under the bowl-shaped resin particle in a predetermined depth is at least four in average.Type: ApplicationFiled: August 27, 2015Publication date: March 3, 2016Inventors: Noboru Miyagawa, Tomohito Taniguchi, Masahiro Watanabe, Taichi Sato, Takehiko Aoyama, Atsushi Uematsu