Patents by Inventor Motohide Shiozawa
Motohide Shiozawa 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: 10228630Abstract: A toner comprising an external additive A, and a toner particle containing a binder resin and a colorant, wherein the external additive A: i) is an external additive that has a charge control agent on the surface thereof; ii) has a wall friction angle ? calculated from the following formula (1) of not more than 25.0° ?=?/5.0??formula (1); iii) has a number-average particle diameter (D1) of primary particles of at least 70 nm and not more than 500 nm; and iv) has a solidity as given by the following formula (2) of at least 0.40 and not more than 0.90 solidity=area of external additive A/area of region encompassed by envelope for external additive A?? formula (2).Type: GrantFiled: September 7, 2017Date of Patent: March 12, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Takuya Mizuguchi, Kazuo Terauchi, Yojiro Hotta, Takeshi Naka, Motohide Shiozawa, Masami Fujimoto
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Publication number: 20180074425Abstract: A toner comprising an external additive A, and a toner particle containing a binder resin and a colorant, wherein the external additive A: i) is an external additive that has a charge control agent on the surface thereof; ii) has a wall friction angle ? calculated from the following formula (1) of not more than 25.0° ?=?/5.0??formula (1); iii) has a number-average particle diameter (D1) of primary particles of at least 70 nm and not more than 500 nm; and iv) has a solidity as given by the following formula (2) of at least 0.40 and not more than 0.90 solidity=area of external additive A/area of region encompassed by envelope for external additive A?? formula (2).Type: ApplicationFiled: September 7, 2017Publication date: March 15, 2018Inventors: Takuya Mizuguchi, Kazuo Terauchi, Yojiro Hotta, Takeshi Naka, Motohide Shiozawa, Masami Fujimoto
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Patent number: 9897932Abstract: A toner comprising: a toner particle containing a toner base particle containing a binder resin and a colorant, and a resin particle fixed to a surface of the toner base particle; and an inorganic fine particle A, wherein the surface of the toner particle has protruded portions originating in the resin particle, an average length (D) of long sides of the protruded portions is 50 nm to 300 nm, an average Height (H) of the protruded portions is 25 nm to 250 nm, the average long-side length and the average height of the protruded portions satisfies a specific relationship, and an average value of a compactness of the inorganic fine particle A is 0.40 to 0.80, and the attachment rate of the inorganic fine particles A is 0.1% to 5.0% by area.Type: GrantFiled: January 31, 2017Date of Patent: February 20, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Yojiro Hotta, Kazuo Terauchi, Tsuneyoshi Tominaga, Akane Masumoto, Takuya Mizuguchi, Motohide Shiozawa, Takeshi Naka, Masami Fujimoto, Shingo Ito, Kousuke Yamamoto, Yasukazu Ikami
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Patent number: 9778583Abstract: A toner having compatibility between transfer properties and cleaning properties is provided. A toner wherein a fine particle A containing a primary particle having a number average particle diameter (D1) of 80 nm or more and 400 nm or less is present on the surface of a toner particle at a coverage ratio of 5 to 40%, a fixing rate of 30 to 90% by mass, and a variation coefficient of 0.1 to 0.5 in a region of 0.5 ??m2.Type: GrantFiled: August 3, 2015Date of Patent: October 3, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Kazuo Terauchi, Yojiro Hotta, Takeshi Naka, Motohide Shiozawa, Shohei Tsuda, Masami Fujimoto
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Publication number: 20170227864Abstract: A toner comprising: a toner particle containing a toner base particle containing a binder resin and a colorant, and a resin particle fixed to a surface of the toner base particle; and an inorganic fine particle A, wherein the surface of the toner particle has protruded portions originating in the resin particle, an average length (D) of long sides of the protruded portions is 50 nm to 300 nm, an average Height (H) of the protruded portions is 25 nm to 250 nm, the average long-side length and the average height of the protruded portions satisfies a specific relationship, and an average value of a compactness of the inorganic fine particle A is 0.40 to 0.80, and the attachment rate of the inorganic fine particles A is 0.1% to 5.0% by area.Type: ApplicationFiled: January 31, 2017Publication date: August 10, 2017Inventors: Yojiro Hotta, Kazuo Terauchi, Tsuneyoshi Tominaga, Akane Masumoto, Takuya Mizuguchi, Motohide Shiozawa, Takeshi Naka, Masami Fujimoto, Shingo Ito, Kousuke Yamamoto, Yasukazu Ikami
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Patent number: 9715188Abstract: The toner comprising a toner particle containing a binder resin and a colorant, an iron oxide particle and an organic-inorganic composite fine particle, wherein the organic-inorganic composite fine particle comprises a vinyl resin particle, and inorganic fine particles which are embedded in the vinyl resin particle, and at least a part of which is exposed at surface of the organic-inorganic composite fine particle; the organic-inorganic composite fine particle has convexes derived from the inorganic fine particles, and wherein: a coverage ratio of the surface of the organic-inorganic composite fine particle with the inorganic fine particle is 20-70%; and the content of the iron oxide particle present on a surface of the toner particle is 0.1-5.0 mass % based on the mass of the toner particle.Type: GrantFiled: July 30, 2014Date of Patent: July 25, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Kazuo Terauchi, Koji Nishikawa, Shohei Tsuda, Yojiro Hotta, Katsuhisa Yamazaki, Takayuki Itakura, Takeshi Naka, Motohide Shiozawa
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Patent number: 9588450Abstract: Provided is a magnetic toner in which enhancement of initial transfer efficiency and transfer efficiency that is stable during a long-term use are achieved by simultaneously suppressing the friction force between the toner and a drum and the cohesion between toners, and further the degradation in chargeability and fluidity caused by the deterioration of the toner. The magnetic toner includes: a magnetic toner particle; a first external additive; and a second external additive. The first external additive includes an organic-inorganic composite fine particle, a plurality of convexes derived from an inorganic fine particle being present on a surface of the organic-inorganic composite fine particle, and has a number-average particle diameter of 50 nm or more and 500 nm or less. The second external additive includes a silica fine particle and has a number-average particle diameter of 5 nm or more and 30 nm or less. A shear load calculated from a rotation torque is 0.50 kPa or more and 2.Type: GrantFiled: July 30, 2014Date of Patent: March 7, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Shohei Tsuda, Koji Nishikawa, Katsuhisa Yamazaki, Yojiro Hotta, Kazuo Terauchi, Motohide Shiozawa, Takeshi Naka, Takuya Mizuguchi, Takayuki Itakura
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Patent number: 9575425Abstract: A toner is provided including large particle-diameter external additives with sweep to the concaves of a toner particle suppressed, so that the large particle-diameter external additives function as spacer particles for a long period. The toner includes toner particles which contain a binder resin and magnetic material, and organic-inorganic composite fine particles having a structure including inorganic fine particles embedded in a vinyl resin particle. The presence state of the magnetic material on the toner particle surface satisfies specific conditions and the presence state of the organic-inorganic composite fine particles on the toner surface satisfies specific conditions.Type: GrantFiled: July 29, 2014Date of Patent: February 21, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Takeshi Naka, Kazuo Terauchi, Motohide Shiozawa, Yojiro Hotta, Shohei Tsuda, Katsuhisa Yamazaki, Koji Nishikawa, Takayuki Itakura
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Publication number: 20160091809Abstract: Provided is a magnetic toner in which enhancement of initial transfer efficiency and transfer efficiency that is stable during a long-term use are achieved by simultaneously suppressing the friction force between the toner and a drum and the cohesion between toners, and further the degradation in chargeability and fluidity caused by the deterioration of the toner. The magnetic toner includes: a magnetic toner particle; a first external additive; and a second external additive. The first external additive includes an organic-inorganic composite fine particle, a plurality of convexes derived from an inorganic fine particle being present on a surface of the organic-inorganic composite fine particle, and has a number-average particle diameter of 50 nm or more and 500 nm or less. The second external additive includes a silica fine particle and has a number-average particle diameter of 5 nm or more and 30 nm or less. A shear load calculated from a rotation torque is 0.50 kPa or more and 2.Type: ApplicationFiled: July 30, 2014Publication date: March 31, 2016Inventors: Shohei Tsuda, Koji Nishikawa, Katsuhisa Yamazaki, Yojiro Hotta, Kazuo Terauchi, Motohide Shiozawa, Takeshi Naka, Takuya Mizuguchi, Takayuki Itakura
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Publication number: 20160070192Abstract: The toner comprising a toner particle containing a binder resin and a colorant, an iron oxide particle and an organic-inorganic composite fine particle, wherein the organic-inorganic composite fine particle comprises a vinyl resin particle, and inorganic fine particles which are embedded in the vinyl resin particle, and at least a part of which is exposed at surface of the organic-inorganic composite fine particle; the organic-inorganic composite fine particle has convexes derived from the inorganic fine particles, and wherein: a coverage ratio of the surface of the organic-inorganic composite fine particle with the inorganic fine particle is 20-70%; and the content of the iron oxide particle present on a surface of the toner particle is 0.1-5.0 mass % based on the mass of the toner particle.Type: ApplicationFiled: July 30, 2014Publication date: March 10, 2016Inventors: Kazuo Terauchi, Koji Nishikawa, Shohei Tsuda, Yojiro Hotta, Katsuhisa Yamazaki, Takayuki Itakura, Takeshi Naka, Motohide Shiozawa
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Publication number: 20160041482Abstract: A toner having compatibility between transfer properties and cleaning properties is provided. A toner wherein a fine particle A containing a primary particle having a number average particle diameter (D1) of 80 nm or more and 400 nm or less is present on the surface of a toner particle at a coverage ratio of 5 to 40%, a fixing rate of 30 to 90% by mass, and a variation coefficient of 0.1 to 0.5 in a region of 0.5 ??m2.Type: ApplicationFiled: August 3, 2015Publication date: February 11, 2016Inventors: Kazuo Terauchi, Yojiro Hotta, Takeshi Naka, Motohide Shiozawa, Shohei Tsuda, Masami Fujimoto
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Publication number: 20150125790Abstract: A magnetic toner having a toner particle containing a binder resin and a magnetic member, a first inorganic fine particle and an organic-inorganic composite particle on the surface of the toner particle, wherein the organic-inorganic composite particle i) has a structure in which a second inorganic fine particle is embedded in a resin particle, and ii) is contained in an amount of 0.5 mass % or more and 3.0 mass % or less based on the mass of the toner; the first inorganic fine particle contains an inorganic oxide fine particle selected from the group consisting of a silica fine particle, a titanium oxide fine particle and an alumina fine particle; has a number average particle diameter (D1) of 5 nm or more and 25 nm or less, and contains the silica fine particle in an amount of 85 mass % or more based on the inorganic oxide fine particle.Type: ApplicationFiled: January 13, 2015Publication date: May 7, 2015Inventors: Yojiro Hotta, Koji Nishikawa, Shohei Tsuda, Motohide Shiozawa, Takeshi Naka, Kazuo Terauchi, Katsuhisa Yamazaki, Takayuki Itakura
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Publication number: 20150037719Abstract: A toner is provided including large particle-diameter external additives with sweep to the concaves of a toner particle suppressed, so that the large particle-diameter external additives function as spacer particles for a long period. The toner includes toner particles which contain a binder resin and magnetic material, and organic-inorganic composite fine particles having a structure including inorganic fine particles embedded in a vinyl resin particle. The presence state of the magnetic material on the toner particle surface satisfies specific conditions and the presence state of the organic-inorganic composite fine particles on the toner surface satisfies specific conditions.Type: ApplicationFiled: July 29, 2014Publication date: February 5, 2015Inventors: Takeshi Naka, Kazuo Terauchi, Motohide Shiozawa, Yojiro Hotta, Shohei Tsuda, Katsuhisa Yamazaki, Koji Nishikawa, Takayuki Itakura
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Patent number: 8736900Abstract: In the case where a sheet on which a transparent toner image is to be formed has high glossiness, the transparent toner image is placed in an image formable area except for the area in which the user wishes to increase the glossiness.Type: GrantFiled: January 28, 2010Date of Patent: May 27, 2014Assignee: Canon Kabushiki KaishaInventor: Motohide Shiozawa
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Patent number: 8634754Abstract: A control apparatus configured to control an image forming system, in forming a transparent image so as to cover color images fixed on a sheet, applies a transparent toner on an area on which an image can be formed and which is other than an area that a user desires to increase the glossiness thereof.Type: GrantFiled: June 22, 2012Date of Patent: January 21, 2014Assignee: Canon Kabushiki KaishaInventor: Motohide Shiozawa
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Patent number: 8521075Abstract: A control apparatus configured to control an image forming system, in forming a transparent toner on a sheet having color toners formed and fixed thereon, applies a transparent toner on an area on which an image can be formed and which is other than an area that a user desires to reduce the glossiness thereof.Type: GrantFiled: January 28, 2010Date of Patent: August 27, 2013Assignee: Canon Kabushiki KaishaInventor: Motohide Shiozawa
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Patent number: 8428478Abstract: An image forming apparatus includes a selector for selecting a first mode in which a transparent toner image is partly formed on a surface of a recording material and a second mode in which the transparent toner image is formed so that whole surface of the recording material is coated with a transparent toner; and a controller for controlling execution so that execution of the first and second image forming modes are permitted when information indicates that the recording material has not been subjected to image formation before the recording material is placed to a placing portion and so that execution of the second mode is permitted but execution of the first mode is forbidden when the information indicates that the recording material has already been subjected to image formation before the recording material is placed to the placing portion.Type: GrantFiled: November 22, 2010Date of Patent: April 23, 2013Assignee: Canon Kabushiki KaishaInventor: Motohide Shiozawa
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Patent number: 8391733Abstract: In the case where a sheet on which a transparent toner image is to be formed has low glossiness, when the transparent toner image is formed in an area in which a user wishes to partly lower the glossiness, the glossiness in the area in which the user wishes to lower the glossiness is increased. For that reason, a print as desired by the user cannot be obtained by fixing the transparent toner image in an area corresponding to the area in which the user wishes to lower the glossiness. In the case where the sheet to be subjected to printing is judged as low glossy paper, the transparent toner image is placed in an image formable area except for the area in which the user wishes to lower the glossiness.Type: GrantFiled: January 28, 2010Date of Patent: March 5, 2013Assignee: Canon Kabushiki KaishaInventor: Motohide Shiozawa
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Publication number: 20120263482Abstract: A control apparatus configured to control an image forming system, in forming a transparent image so as to cover color images fixed on a sheet, applies a transparent toner on an area on which an image can be formed and which is other than an area that a user desires to increase the glossiness thereof.Type: ApplicationFiled: June 22, 2012Publication date: October 18, 2012Applicant: CANON KABUSHIKI KAISHAInventor: Motohide Shiozawa
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Patent number: 8229340Abstract: A control apparatus configured to control an image forming system, in forming a transparent image so as to cover color images fixed on a sheet, applies a transparent toner on an area on which an image can be formed and which is other than an area that a user desires to increase the glossiness thereof.Type: GrantFiled: January 28, 2010Date of Patent: July 24, 2012Assignee: Canon Kabushiki KaishaInventor: Motohide Shiozawa