Patents by Inventor Takashi Bisaiji
Takashi Bisaiji 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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Patent number: 10324388Abstract: A toner including base particles and external additives on the base particles, the toner satisfying Conditions 1 and 2 defined in the specification, when a number distribution D of particle diameters of powder particles B generated from one base particle A is calculated from a density a of the base particles A and a density b of the powder particles B, where the base particles A and the powder particles B are deposited on an adhesive area and mica respectively by feeding the toner into a vacuumed space from an inlet, and allowing the toner to crush against a surface of a substrate having the adhesive area composed of a carbon tape, and the mica disposed in a manner that the surface is orthogonal to a direction connecting between center of the vacuumed space and center of the inlet, Powder particles B: particles detached from the base particles.Type: GrantFiled: March 13, 2017Date of Patent: June 18, 2019Assignee: Ricoh Company, Ltd.Inventors: Toshiyuki Kabata, Takashi Bisaiji, Maiko Koeda, Katsunori Kurose
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Publication number: 20170269489Abstract: A toner including base particles and external additives on the base particles, the toner satisfying Conditions 1 and 2 defined in the specification, when a number distribution D of particle diameters of powder particles B generated from one base particle A is calculated from a density a of the base particles A and a density b of the powder particles B, where the base particles A and the powder particles B are deposited on an adhesive area and mica respectively by feeding the toner into a vacuumed space from an inlet, and allowing the toner to crush against a surface of a substrate having the adhesive area composed of a carbon tape, and the mica disposed in a manner that the surface is orthogonal to a direction connecting between center of the vacuumed space and center of the inlet, Powder particles B: particles detached from the base particles.Type: ApplicationFiled: March 13, 2017Publication date: September 21, 2017Inventors: Toshiyuki KABATA, Takashi BISAIJI, Maiko KOEDA, Katsunori KUROSE
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Patent number: 9223261Abstract: An image forming apparatus including multiple imaging units and a fixing unit is provided. Each of the imaging units includes an image bearing member, a developing device containing a toner including a pressure-induced phase transition resin or a thermoplastic resin, a transfer device, and an image bearing member cleaner, and is adapted to form a toner image with the toner. The fixing unit includes a pressure fixing device adapted to fix the toner including the pressure-induced phase transition resin on the recording medium by applying a temperature Tb and a pressure Pb thereto in a pressure fixing nip, and a heat fixing device adapted to fix the toner including the thermoplastic resin on the recording medium by applying a temperature Ta and a pressure Pa thereto in a heat fixing nip. The image forming apparatus satisfies the following inequations: Tb<Ta and Pb>Pa.Type: GrantFiled: June 29, 2012Date of Patent: December 29, 2015Assignee: Ricoh Company, Ltd.Inventors: Hirohmi Tamura, Satoru Ishikake, Hirokatsu Suzuki, Ryuji Yoshida, Takashi Bisaiji
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Patent number: 9052643Abstract: The image forming method comprising: forming a toner image on an image carrier; transferring the toner image formed on the image carrier onto a recording medium; and transforming the toner image on the image carrier into a semi-film by applying a pressure. And the image forming apparatus comprising: an image carrier; a toner image forming unit configured to form a toner image on the image carrier; a transfer unit configured to transfer the toner image formed on the image carrier onto a recording medium; and a toner image transforming unit configured to transfer the toner image on the image carrier into a semi-film by applying a pressure to the toner image.Type: GrantFiled: December 5, 2012Date of Patent: June 9, 2015Assignee: RICOH COMPANY, LIMITEDInventors: Takashi Bisaiji, Hiroomi Tamura, Hirokatsu Suzuki, Takamasa Ozeki, Satoru Ishikake
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Patent number: 9026007Abstract: An image forming apparatus comprising: a plurality of housing units that houses toners of mutually different colors, at least one toner inside of the plurality of housing units being to be used for forming a toner image on a recording medium; and a fixing unit configured to fix the toner image on the recording medium to the recording medium, wherein a housing unit among the plurality of housing units that houses a toner with a lowest peak temperature of loss elastic modulus is disposed in a portion with a lower temperature than a temperature of a portion where another housing unit is disposed, or in a position farther from the fixing unit than a portion where another housing unit is disposed.Type: GrantFiled: December 17, 2012Date of Patent: May 5, 2015Assignee: Ricoh Company, Ltd.Inventors: Takashi Bisaiji, Hiroomi Tamura, Hirokatsu Suzuki, Satoru Ishikake, Ryuji Yoshida
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Patent number: 8630573Abstract: An image forming method including forming a toner image on a transfer medium with a toner comprising a wax having a polar group, and applying a varnish to the toner image. The wax may be a plant wax having an ester group, a wax having a polar group derived from a fatty acid, an oxidized wax, or a mixture thereof. The varnish may include a surfactant, such as a polyoxyethylene glycol, and may be photocurable.Type: GrantFiled: March 8, 2011Date of Patent: January 14, 2014Assignee: Ricoh Company, Ltd.Inventors: Masato Iio, Tsuyoshi Asami, Kentarou Matsumoto, Shinya Kobayashi, Akio Tsujita, Kathuhiro Shinohara, Tadashi Kasai, Takashi Bisaiji
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Publication number: 20130164053Abstract: The image forming method comprising: forming a toner image on an image carrier; transferring the toner image formed on the image carrier onto a recording medium; and transforming the toner image on the image carrier into a semi-film by applying a pressure. And the image forming apparatus comprising: an image carrier; a toner image forming unit configured to form a toner image on the image carrier; a transfer unit configured to transfer the toner image formed on the image carrier onto a recording medium; and a toner image transforming unit configured to transfer the toner image on the image carrier into a semi-film by applying a pressure to the toner image.Type: ApplicationFiled: December 5, 2012Publication date: June 27, 2013Inventors: Takashi BISAIJI, Hiroomi TAMURA, Hirokatsu SUZUKI, Takamasa OZEKI, Satoru ISHIKAKE
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Publication number: 20130156466Abstract: An image forming apparatus comprising: a plurality of housing units that houses toners of mutually different colors, at least one toner inside of the plurality of housing units being to be used for forming a toner image on a recording medium; and a fixing unit configured to fix the toner image on the recording medium to the recording medium, wherein a housing unit among the plurality of housing units that houses a toner with a lowest peak temperature of loss elastic modulus is disposed in a portion with a lower temperature than a temperature of a portion where another housing unit is disposed, or in a position farther from the fixing unit than a portion where another housing unit is disposed.Type: ApplicationFiled: December 17, 2012Publication date: June 20, 2013Inventors: Takashi BISAIJI, Hiroomi TAMURA, Hirokatsu SUZUKI, Satoru ISHIKAKE, Ryuji YOSHIDA
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Patent number: 8364065Abstract: An image forming apparatus is disclosed, including: a toner image forming unit which forms a toner image on a surface of a transfer material, the toner image being an image formed of toner, the toner containing wax; a fixing device which fixes the toner image using a fixing member on which a mold release agent including oil is applied; and a surface processing device which processes the fixed surface of the transfer material, on which surface the toner image is fixed using the fixing member on which the mold release agent including the oil is applied, wherein the surface processing device further includes a discharging unit which generates a discharge on or near the fixed surface of the transfer material, on which surface the fixed toner image is formed.Type: GrantFiled: September 13, 2010Date of Patent: January 29, 2013Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.Inventors: Takashi Bisaiji, Yasutada Shitara, Hijiri Ogata, Haruki Saitoh
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Publication number: 20130011171Abstract: An image forming apparatus including multiple imaging units and a fixing unit is provided. Each of the imaging units includes an image bearing member, a developing device containing a toner including a pressure-induced phase transition resin or a thermoplastic resin, a transfer device, and an image bearing member cleaner, and is adapted to form a toner image with the toner. The fixing unit includes a pressure fixing device adapted to fix the toner including the pressure-induced phase transition resin on the recording medium by applying a temperature Tb and a pressure Pb thereto in a pressure fixing nip, and a heat fixing device adapted to fix the toner including the thermoplastic resin on the recording medium by applying a temperature Ta and a pressure Pa thereto in a heat fixing nip. The image forming apparatus satisfies the following inequations: Tb<Ta and Pb>Pa.Type: ApplicationFiled: June 29, 2012Publication date: January 10, 2013Applicant: RICOH COMPANY, LTD.Inventors: Hirohmi Tamura, Satoru Ishikake, Hirokatsu Suzuki, Ryuji Yoshida, Takashi Bisaiji
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Publication number: 20120141181Abstract: A surface treating apparatus configured to treat a surface of a transfer material includes a discharge part configured to cause dielectric barrier discharge on or near the surface of the transfer material where a toner image is to be formed on the surface and to cause the surface of the transfer material to be directly exposed to the dielectric barrier discharge, so as to increase the wettability of the surface of the transfer material with respect to toner for forming the toner image.Type: ApplicationFiled: November 29, 2011Publication date: June 7, 2012Inventors: Takashi BISAIJI, Hijiri Ogata, Haruki Saitoh
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Publication number: 20110223527Abstract: An image forming method including forming a toner image on a transfer medium with a toner comprising a wax having a polar group, and applying a varnish to the toner image. The wax may be a plant wax having an ester group, a wax having a polar group derived from a fatty acid, an oxidized wax, or a mixture thereof. The varnish may include a surfactant, such as a polyoxyethylene glycol, and may be photocurable.Type: ApplicationFiled: March 8, 2011Publication date: September 15, 2011Applicant: Ricoh Company, Ltd.Inventors: Masato Iio, Tsuyoshi Asami, Kentarou Matsumoto, Shinya Kobayashi, Akio Tsujita, Kathuhiro Shinohara, Tadashi Kasai, Takashi Bisaiji
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Publication number: 20110064489Abstract: An image forming apparatus is disclosed, including: a toner image forming unit which forms a toner image on a surface of a transfer material, the toner image being an image formed of toner, the toner containing wax; a fixing device which fixes the toner image using a fixing member on which a mold release agent including oil is applied; and a surface processing device which processes the fixed surface of the transfer material, on which surface the toner image is fixed using the fixing member on which the mold release agent including the oil is applied, wherein the surface processing device further includes a discharging unit which generates a discharge on or near the fixed surface of the transfer material, on which surface the fixed toner image is formed.Type: ApplicationFiled: September 13, 2010Publication date: March 17, 2011Inventors: Takashi Bisaiji, Yasutada Shitara, Hijiri Ogata, Haruki Saitoh
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Patent number: 6434354Abstract: An image forming apparatus of the type sequentially forming toner images of different colors on an image carrier while sequentially transferring them to an intermediate transfer body one above the other, and then transferring the resulting composite toner image from the intermediate transfer body to a paper or similar recording medium. Dot toner images different from desired toner images are formed on the image carrier. The dot toner images are transferred from the image carrier to the intermediate transfer body and then to the recording medium. The individual toner images are transferred from the image carrier to the intermediate transfer body in accurate register with each other.Type: GrantFiled: February 27, 2001Date of Patent: August 13, 2002Assignee: Ricoh Company, Ltd.Inventor: Takashi Bisaiji
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Publication number: 20010007616Abstract: An image forming apparatus of the type sequentially forming toner images of different colors on an image carrier while sequentially transferring them to an intermediate transfer body one above the other, and then transferring the resulting composite toner image from the intermediate transfer body to a paper or similar recording medium. Dot toner images different from desired toner images are formed on the image carrier. The dot toner images are transferred from the image carrier to the intermediate transfer body and then to the recording medium. The individual toner images are transferred from the image carrier to the intermediate transfer body in accurate register with each other.Type: ApplicationFiled: February 27, 2001Publication date: July 12, 2001Applicant: RICOH COMPANY, LTD.Inventor: Takashi Bisaiji
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Patent number: 6259879Abstract: An image forming apparatus of the type sequentially forming toner images of different colors on an image carrier while sequentially transferring them to an intermediate transfer body one above the other, and then transferring the resulting composite toner image from the intermediate transfer body to a paper or similar recording medium. Dot toner images different from desired toner images are formed on the image carrier. The dot toner images are transferred from the image carrier to the intermediate transfer body and then to the recording medium. The individual toner images are transferred from the image carrier to the intermediate transfer body in accurate register with each other.Type: GrantFiled: December 10, 1999Date of Patent: July 10, 2001Assignee: Ricoh Company, Ltd.Inventor: Takashi Bisaiji
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Patent number: 6185007Abstract: When an ACC menu is called out on a liquid crystal screen of an operating section, the screen shown in FIG. 19 is displayed. When “Execution” of automatic color calibration for use of a copying function is selected, the screen in FIG. 20 is displayed. When it is desired to use the copying function, a gradation calibration table used when the copying function is changed with reference to the deference data. When Print Start key in FIG. 20 is selected, a plurality of density gradation patterns corresponding to colors of YMCK as well as to a plurality of image quality mode such as characters and pictures are formed on a transfer material. The density gradation patterns are previously stored and set in a ROM of an IPU. A write value for a pattern is changed according to a result of detection of the development characteristics.Type: GrantFiled: August 18, 1998Date of Patent: February 6, 2001Assignee: Ricoh Company, Ltd.Inventors: Koji Hayashi, Takashi Bisaiji, Katsuhisa Tsuji, Kazumi Kuwata
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Patent number: 6091922Abstract: An image forming apparatus of the type sequentially forming toner images of different colors on an image carrier while sequentially transferring them to an intermediate transfer body one above the other, and then transferring the resulting composite toner image from the intermediate transfer body to a paper or similar recording medium. Dot toner images different from desired toner images are formed on the image carrier. The dot toner images are transferred from the image carrier to the intermediate transfer body and then to the recording medium. The individual toner images are transferred from the image carrier to the intermediate transfer body in accurate register with each other.Type: GrantFiled: July 31, 1998Date of Patent: July 18, 2000Assignee: Ricoh Company, Ltd.Inventor: Takashi Bisaiji
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Patent number: 6061543Abstract: An image forming apparatus has a transfer region located between a first belt and a second belt, which belts are respectively spanned and tensioned around a plurality of rollers. A total length of the first belt is substantially equal to integral multiples of a total length of the second belt. Certain portions of the belts are deformed via plastic deformation caused by contacting the plurality of rollers. The rollers are arranged so that deformed portions of the belts do not overlap each other in the transfer region.Type: GrantFiled: June 29, 1999Date of Patent: May 9, 2000Assignee: Ricoh Company, Ltd.Inventors: Shin Kayahara, Takashi Bisaiji
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Patent number: RE38206Abstract: A device incorporated in an image forming apparatus for transferring a toner image from a photoconductive element to an intermediate transfer belt and then from the intermediate transfer belt to a sheet or similar recording medium. An electrode member is implemented as a belt drive roller and located at the rear of a portion of the intermediate transfer belt which lies in a position for transferring the toner image from the belt to a sheet. The electrode member has a specific volume resistance of 107 &OHgr;cm to 1012 &OHgr;cm.Type: GrantFiled: December 23, 1999Date of Patent: July 29, 2003Assignee: Ricoh Company, Ltd.Inventors: Takashi Bisaiji, Hideo Yu, Yasunori Kawaishi, Toshiaki Motohashi, Mitsuru Takahashi, Hideki Kamiyama