Patents by Inventor Yusuke Hasegawa
Yusuke Hasegawa 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: 8614044Abstract: To provide a toner which can achieve both low-temperature fixing performance and dot reproducibility and further can obtain images on which any density non-uniformity has been kept from coming about, the toner has toner particles, each of the toner particles has a toner base particle containing a binder resin, a colorant and a release agent, and an inorganic fine powder; the toner having: (1) an average circularity of 0.960 or more; (2) a number-average molecular weight Mn(25° C.) of from 500 or more to 3,000 or less in measuring a tetrahydrofuran-soluble matter at 25° C. of the toner by SEC-MALLS; and (3) a value of Mn(135° C.)/Mn(25° C.) of from 25 or more to 50 or less which is the ratio of number-average molecular weight Mn(135° C.) in measuring an o-dichlorobenzene-soluble matter at 135° C. of the toner by SEC-MALLS to number-average molecular weight Mn(25° C.) in measuring a tetrahydrofuran-soluble matter at 25° C. of the toner by SEC-MALLS.Type: GrantFiled: June 13, 2011Date of Patent: December 24, 2013Assignee: Canon Kabushiki KaishaInventors: Takashi Matsui, Michihisa Magome, Yusuke Hasegawa, Tomohisa Sano, Shuichi Hiroko, Yoshitaka Suzumura, Shotaro Nomura, Atsuhiko Ohmori
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Patent number: 8304973Abstract: In a flash lamp 1, a front end part 62 of a cathode 60 and a front end part 72 of an anode 70 are opposed to each other on a reference line RL, and with respect to a reference surface RS including the reference line RL, a front end part 82 of a trigger electrode 80 is located on one side, and a front end part 92 of a trigger electrode 90 is located on the other side. Further, a terminal end 82a of the front end part 82 of the trigger electrode 80 and a terminal end 92a of the front end part 92 of the trigger electrode 90 are separated from the reference line RL, and each front end part 82, 92 is formed so as to taper toward the reference line RL. Accordingly, an arc discharge occurs in a limited route R from a terminal end portion of the front end part 62 of the cathode 60 through a terminal end portion of the front end part 82 of the trigger electrode 80 and a terminal end portion of the front end part 92 of the trigger electrode 90 to a terminal end portion of the front end part 72 of the anode 70.Type: GrantFiled: August 23, 2010Date of Patent: November 6, 2012Assignee: Hamamatsu Photonics K.K.Inventors: Yuichi Yamashita, Yusuke Hasegawa
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Publication number: 20120231384Abstract: A magnetic toner which has superior charging stability and charging uniformity, maintains stable developing performance without any dependence on service environments and may less cause any decrease in image density and any image defects such as fog and ghost, the magnetic toner has magnetic toner particles, each of the magnetic toner particles has magnetic toner base particle containing a binder resin and a magnetic material, and an inorganic fine powder, (a) the magnetic toner having, at a frequency of 100 kHz and a temperature of 30° C., a dielectric loss factor (??) of 2.5×10?1 pF/m or more and 7.0×10?1 pF/m or less and a dielectric dissipation factor (tan ?L) of 3.0×10?2 or less, (b) the magnetic toner having, in a dielectric dissipation factor (tan ?) thereof at a frequency of 100 kHz, a maximum value (tan ?H) within the temperature range of 60° C. to 140° C.; and the tan ?H and the tan ?L satisfying (tan ?H?tan ?L)?3.0×10?2.Type: ApplicationFiled: May 25, 2011Publication date: September 13, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Kozue Aoki, Yusuke Hasegawa, Yoshitaka Suzumura
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Patent number: 8124306Abstract: The object of the present invention is to provide a magnetic toner enabling an image with high image density and excellent image reproducibility to be obtained, which is excellent in fluidity, charging stability, and charging uniformity, even for long-term use, and also enabling an image whose fogging, ghost, and scattering are suppressed to be obtained. The magnetic toner has at least a binder resin and a magnetic material, where, the magnetic material is an magnetic iron oxide whose dielectric breakdown voltage of the magnetic material is 160 to 1600 V/cm, and the dielectric loss tangent (tan ?) of the magnetic toner at 100 kHz and 40° C. is 2.0×10?3 to 1.0×10?2.Type: GrantFiled: April 25, 2007Date of Patent: February 28, 2012Assignee: Canon Kabushiki KaishaInventors: Junko Hirata, Yoshihiro Ogawa, Yusuke Hasegawa, Kouji Nishikawa, Miho Okazaki, Takashige Kasuya
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Publication number: 20120043883Abstract: In a flash lamp 1, a front end part 62 of a cathode 60 and a front end part 72 of an anode 70 are opposed to each other on a reference line RL, and with respect to a reference surface RS including the reference line RL, a front end part 82 of a trigger electrode 80 is located on one side, and a front end part 92 of a trigger electrode 90 is located on the other side. Further, a terminal end 82a of the front end part 82 of the trigger electrode 80 and a terminal end 92a of the front end part 92 of the trigger electrode 90 are separated from the reference line RL, and each front end part 82, 92 is formed so as to taper toward the reference line RL. Accordingly, an arc discharge occurs in a limited route R from a terminal end portion of the front end part 62 of the cathode 60 through a terminal end portion of the front end part 82 of the trigger electrode 80 and a terminal end portion of the front end part 92 of the trigger electrode 90 to a terminal end portion of the front end part 72 of the anode 70.Type: ApplicationFiled: August 23, 2010Publication date: February 23, 2012Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Yuichi YAMASHITA, Yusuke HASEGAWA
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Patent number: 8084174Abstract: An object of the present invention is to provide a toner excellent in ability to prevent electrostatic offset and fixation tailing. Provided is a toner including toner particles each containing at least a binder resin, a wax, and a magnetic iron oxide, and inorganic fine particles, in which the magnetic iron oxide contains at least a Ti component, an Al component, an Si component, and an Fe component; and the each component has some particular characteristics.Type: GrantFiled: September 29, 2009Date of Patent: December 27, 2011Assignee: Canon Kabushiki KaishaInventors: Yusuke Hasegawa, Yoshihiro Ogawa, Kouji Nishikawa, Kentarou Kamae, Takashige Kasuya
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Publication number: 20110311910Abstract: To provide a toner which can achieve both low-temperature fixing performance and dot reproducibility and further can obtain images on which any density non-uniformity has been kept from coming about, the toner has toner particles, each of the toner particles has a toner base particle containing a binder resin, a colorant and a release agent, and an inorganic fine powder; the toner having: (1) an average circularity of 0.960 or more; (2) a number-average molecular weight Mn(25° C.) of from 500 or more to 3,000 or less in measuring a tetrahydrofuran-soluble matter at 25° C. of the toner by SEC-MALLS; and (3) a value of Mn(135° C.)/Mn(25° C.) of from 25 or more to 50 or less which is the ratio of number-average molecular weight Mn(135° C.) in measuring an o-dichlorobenzene-soluble matter at 135° C. of the toner by SEC-MALLS to number-average molecular weight Mn(25° C.) in measuring a tetrahydrofuran-soluble matter at 25° C. of the toner by SEC-MALLS.Type: ApplicationFiled: June 13, 2011Publication date: December 22, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Takashi Matsui, Michihisa Magome, Yusuke Hasegawa, Tomohisa Sano, Shuichi Hiroko, Yoshitaka Suzumura, Shotaro Nomura, Atsuhiko Ohmori
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Patent number: 7939231Abstract: A magnetic toner is disclosed having magnetic toner particles containing a binder resin and a magnetic iron oxide. The magnetic toner has a specific saturation magnetization and a specific residual magnetization in ascertain magnetic field. The binder resin includes a polyester component polymerized with an aromatic carboxylic acid titanium compound as a catalyst.Type: GrantFiled: June 24, 2005Date of Patent: May 10, 2011Assignee: Canon Kabushiki KaishaInventors: Yoshihiro Ogawa, Yusuke Hasegawa, Shinichiro Abe, Junko Nishiyama, Takashige Kasuya
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Patent number: 7811734Abstract: Hydrophobic inorganic fine particles are provided which: does not cause melt adhesion of toner to a photosensitive member and contamination of a contact charging member; imparts excellent flowability, charging performance and durability to toner even after the toner is stored in a high-temperature, high-humidity environment over a long time period; and does not cause dripping of toner and contamination with the toner. The hydrophobic inorganic fine particles are obtained by subjecting inorganic fine particles to surface treatment with silicone oil and then with a silane compound and/or a silazane compound, or by subjecting inorganic fine particles to surface treatment with a silane compound and/or a silazane compound in the presence of silicone oil, and further subjecting the inorganic fine particles thus surface-treated to surface treatment with silicone oil.Type: GrantFiled: September 18, 2009Date of Patent: October 12, 2010Assignee: Canon Kabushiki KaishaInventors: Yoshihiro Ogawa, Yusuke Hasegawa, Kouji Nishikawa, Miho Okazaki, Yoshitaka Suzumura, Takashige Kasuya
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Patent number: 7704659Abstract: To provide a toner which has superior low-temperature fixing performance, high-temperature anti-offsetting properties and developing performance and may cause neither melt sticking of toner to photosensitive member nor turn-up of cleaning blade. The toner contains at least a binder resin, a colorant and a wax, and the wax is characterized by i) being an oxidized hydrocarbon wax, ii) having a hydroxyl value of from 5 mgKOH/g or more to 150 mgKOH/g or less, and iii) having, in molecular weight distribution measured by gel permeation chromatography of tetrahydrofuran-soluble matter, a main peak within the range of molecular weight of from 200 or more to 600 or less, and a component with a molecular weight of 700 or more in a content of 3% by mass or less.Type: GrantFiled: April 8, 2009Date of Patent: April 27, 2010Assignee: Canon Kabushiki KaishaInventors: Yoshihiro Ogawa, Yusuke Hasegawa, Kouji Nishikawa, Miho Okazaki, Takashige Kasuya
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Patent number: 7678524Abstract: A magnetic toner including at least: a binder resin; and a magnetic body, in which, when magnetization at a magnetic field strength of 397.9 kA/m and a coercive force of the magnetic toner are denoted by ?s (Am2/kg) and Hc (kA/m), respectively, a magnetic field strength at which the magnetic toner shows a magnetization value equal to 95% of ?s is denoted by H95% (kA/m), and a number average particle size of the magnetic body is denoted by d (?m), H95%, Hc, and d satisfy the following expressions. 151<H95%<200??(1) 7.Type: GrantFiled: May 3, 2006Date of Patent: March 16, 2010Assignee: Canon Kabushiki KaishaInventors: Yusuke Hasegawa, Yoshihiro Ogawa, Junko Nishiyama, Miho Okazaki, Takashige Kasuya, Tomohisa Sano
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Patent number: 7659018Abstract: The present invention provides a highly efficient fuel cell power supply unit, which is constructed by directly connecting a fuel cell with a capacitor. In this power supply unit, a control device of the unit calculates the output voltage V2 of the fuel cell after the variation of electrical load based on the synthetic current-voltage characteristics of the fuel cell and the capacitor and the predetermined width of the variation of electrical load ?I, calculates the corresponding current Ifc2?, and then calculates the equilibrium reacting gas supply amount Qa1, and supplies an excess amount of the reacting gas exceeding Qa1 before the variation of electrical load.Type: GrantFiled: November 16, 2001Date of Patent: February 9, 2010Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Satoshi Aoyagi, Hibiki Saeki, Yusuke Hasegawa, Kazuo Kotaka
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Publication number: 20100028793Abstract: An object of the present invention is to provide a toner excellent in ability to prevent electrostatic offset and fixation tailing. Provided is a toner including toner particles each containing at least a binder resin, a wax, and a magnetic iron oxide, and inorganic fine particles, in which the magnetic iron oxide contains at least a Ti component, an Al component, an Si component, and an Fe component; and the each component has some particular characteristics.Type: ApplicationFiled: September 29, 2009Publication date: February 4, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Yusuke Hasegawa, Yoshihiro Ogawa, Kouji Nishikawa, Kentarou Kamae, Takashige Kasuya
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Publication number: 20100009277Abstract: Hydrophobic inorganic fine particles are provided which: does not cause melt adhesion of toner to a photosensitive member and contamination of a contact charging member; imparts excellent flowability, charging performance and durability to toner even after the toner is stored in a high-temperature, high-humidity environment over a long time period; and does not cause dripping of toner and contamination with the toner. The hydrophobic inorganic fine particles are obtained by subjecting inorganic fine particles to surface treatment with silicone oil and then with a silane compound and/or a silazane compound, or by subjecting inorganic fine particles to surface treatment with a silane compound and/or a silazane compound in the presence of silicone oil, and further subjecting the inorganic fine particles thus surface-treated to surface treatment with silicone oil.Type: ApplicationFiled: September 18, 2009Publication date: January 14, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Yoshihiro Ogawa, Yusuke Hasegawa, Kouji Nishikawa, Miho Okazaki, Yoshitaka Suzumura, Takashige Kasuya
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Patent number: 7582401Abstract: The invention is to provide a toner excellent in fixing property, high-temperature offset resistance and blocking resistance, and having an excellent developing property. The invention provides a toner including at least a binder resin and a colorant, wherein: the binder resin contains a hybrid resin which contains a polyester-type resin unit by 50 mass % or more and in which a polyester-type resin component and a vinyl-type resin component are chemically bonded; the toner contains 3 to 50 mass % of a tetrahydrofuran-insoluble matter derived from the binder resin; the tetrahydrofuran-insoluble matter contains a hybrid resin; and a tetrahydrofuran-soluble matter, obtained by hydrolyzing the tetrahydrofuran-insoluble matter and separating by filtration, has, in a GPC-measured molecular weight distribution, a main peak within a molecular weight range of 50,000 to 500,000.Type: GrantFiled: April 20, 2006Date of Patent: September 1, 2009Assignee: Canon Kabushiki KaishaInventors: Yoshihiro Ogawa, Yusuke Hasegawa, Tomohisa Sano, Junko Nishiyama, Miho Okazaki, Takashige Kasuya, Koji Nishikawa
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Publication number: 20090197193Abstract: To provide a toner which has superior low-temperature fixing performance, high-temperature anti-offsetting properties and developing performance and may cause neither melt sticking of toner to photosensitive member nor turn-up of cleaning blade. The toner contains at least a binder resin, a colorant and a wax, and the wax is characterized by i) being an oxidized hydrocarbon wax, ii) having a hydroxyl value of from 5 mgKOH/g or more to 150 mgKOH/g or less, and iii) having, in molecular weight distribution measured by gel permeation chromatography of tetrahydrofuran-soluble matter, a main peak within the range of molecular weight of from 200 or more to 600 or less, and a component with a molecular weight of 700 or more in a content of 3% by mass or less.Type: ApplicationFiled: April 8, 2009Publication date: August 6, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Yoshihiro Ogawa, Yusuke Hasegawa, Kouji Nishikawa, Miho Okazaki, Takashige Kasuya
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Publication number: 20090186288Abstract: The object of the present invention is to provide a magnetic toner enabling an image with high image density and excellent image reproducibility to be obtained, which is excellent in fluidity, charging stability, and charging uniformity, even for long-term use, and also enabling an image whose fogging, ghost, and scattering are suppressed to be obtained. The magnetic toner has at least a binder resin and a magnetic material, where, the magnetic material is an magnetic iron oxide whose dielectric breakdown voltage of the magnetic material is 160 to 1600 V/cm, and the dielectric loss tangent (tan ?) of the magnetic toner at 100 kHz and 40° C. is 2.0×10?3 to 1.0×10?2.Type: ApplicationFiled: April 25, 2007Publication date: July 23, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Junko Hirata, Yoshihiro Ogawa, Yusuke Hasegawa, Kouji Nishikawa, Miho Okazaki, Takashige Kasuya
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Publication number: 20090035679Abstract: A magnetic toner is disclosed having magnetic toner particles containing a binder resin and a magnetic iron oxide. The magnetic toner has a specific saturation magnetization and a specific residual magnetization in ascertain magnetic field. The binder resin includes a polyester component polymerized with an aromatic carboxylic acid titanium compound as a catalyst.Type: ApplicationFiled: June 24, 2005Publication date: February 5, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Yoshihiro Ogawa, Yusuke Hasegawa, Shinichiro Abe, Junko Nishiyama, Takashige Kasuya
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Patent number: 7470494Abstract: According to the present invention, a magnetic toner comprising magnetic toner particles including at least a binder resin and magnetic particles is provided, wherein an isoelectric point of the magnetic particles is pH 4.0 or less, in order to provide a magnetic toner stably having an optimum charged amount regardless of environments so that a high-quality image having high blackness can be formed without causing any ghost phenomenon.Type: GrantFiled: June 29, 2005Date of Patent: December 30, 2008Assignee: Canon Kabushiki KaishaInventors: Junko Nishiyama, Yoshihiro Ogawa, Yusuke Hasegawa, Shinichiro Abe, Takashige Kasuya
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Patent number: 7457572Abstract: An image forming method and related process cartridge, the method having the steps of controlling the layer thickness of a toner on a toner bearing member by means of a toner regulating blade, and developing with the toner an electrostatic latent image formed on an electrostatic latent image bearing member, the toner regulating blade has, at its part to be kept in touch with the toner bearing member, a specific ten-point average roughness Rz and a specific ratio (area of contact portion/area of non-contact portion) at a specific face pressure, and the toner has a specific average circularity and has a specific aerated bulk density. This image forming method and process cartridge promise superior developing performance in any environment, can keep sleeve negative ghost from occurring and can keep toner melt adhesion to toner regulating blade and toner melt adhesion to toner bearing member from occurring.Type: GrantFiled: June 22, 2006Date of Patent: November 25, 2008Assignee: Canon Kabushiki KaishaInventors: Tsutomu Onuma, Yoshihiro Ogawa, Yusuke Hasegawa, Koji Nishikawa, Tomohisa Sano, Junko Nishiyama, Miho Okazaki, Takashige Kasuya