Patents by Inventor Yasuhisa MOROOKA
Yasuhisa MOROOKA 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: 10268153Abstract: An image forming apparatus includes an image forming unit including an image carrier, a developing device that includes a developer containing a toner, and a cleaning device including a blade; and a transfer device. The toner contains toner particles having a volume-average particle size of 3 ?m or more and 5 ?m or less, a spherical inorganic external additive having a number-average particle size of 80 nm to 200 nm, and an organic component. In the cleaning device, an external additive residue in or near a contact region between the image carrier and the blade contains the organic component and an inorganic component, the area ratio of the organic component to the inorganic component is 3/7 or more and 7/3 or less, and the area ratio of the inorganic component that is spherical to the external additive residue is 30% or more.Type: GrantFiled: July 14, 2017Date of Patent: April 23, 2019Assignee: FUJI XEROX CO., LTD.Inventors: Makoto Kamisaki, Manabu Furuki, Naoki Ota, Tatsuhiro Igarashi, Yasuhisa Morooka, Jun Sekiya
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Publication number: 20190094730Abstract: An image forming apparatus includes an image carrier that includes a conductive substrate, and a photosensitive layer and a surface protection layer; a developing device that includes an electrostatic image developer containing a toner, and develops the electrostatic image to form a toner image. The toner contains an amorphous polyester resin and has a weight average molecular weight Mw in a range of from 25,000 to 60,000, and a ratio of the weight average molecular weight Mw to a number average molecular weight Mn (Mw/Mn) is in a range of from 5 to 10. In the toner, a ratio of an absorbance for a wavelength of 1500 cm?1 to an absorbance for a wavelength of 720 cm?1 is 0.6 or less, and a ratio of an absorbance for a wavelength of 820 cm?1 to the absorbance for a wavelength of 720 cm?1 is 0.4 or less.Type: ApplicationFiled: April 3, 2018Publication date: March 28, 2019Applicant: FUJI XEROX CO., LTD.Inventors: Makoto KAMISAKI, Naoki OTA, Tatsuhiro IGARASHI, Yasuhisa MOROOKA, Jun SEKIYA
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Publication number: 20190094731Abstract: An image forming apparatus includes an image holding member, a charging device, an electrostatic charge image forming device, a developing device having a toner, a transfer device, and a fixing device, wherein the fixing device includes a fixing belt, a rotational member, and a heater; the toner contains an amorphous polyester resin as a binder resin; and the toner has a weight average molecular weight Mw and a number average molecular weight Mn, Mw is from 25000 to 60000, and Mw/Mn is from 5 to 10, and has an infrared absorption spectrometry, the ratio of absorbance for a wavelength of 1500 cm?1 to absorbance for a wavelength of 720 cm?1 is 0.6 or less, and the ratio of absorbance for a wavelength of 820 cm?1 to absorbance for a wavelength of 720 cm?1 is 0.4 or less.Type: ApplicationFiled: March 8, 2018Publication date: March 28, 2019Applicant: FUJI XEROX CO., LTD.Inventors: Tatsuhiro IGARASHI, Manabu FURUKI, Naoki OTA, Makoto KAMISAKI, Yasuhisa MOROOKA, Jun SEKIYA
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Patent number: 10120295Abstract: An image forming apparatus includes a fixing unit that includes a heating and pressurizing member, and fixes the toner image by performing the operation of heating and pressurizing on the toner image on a recording medium twice or more times with the heating and pressurizing member, wherein the toner contains a toner particle which contains a binder resin containing a crystalline polyester resin, a colorant, and a release agent, and an external additive, and satisfies Expression: 2?tan ?P1?2.5, wherein tan ?P1 represents a maximum value of a mechanical loss tangent existing in a range where a complex elastic modulus is from 1×106 Pa to 1×108 Pa, which is measured at an angular frequency of 6.28 rad/sec and a distortion amount of 0.3%.Type: GrantFiled: February 2, 2017Date of Patent: November 6, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Naoki Ota, Masataka Kuribayashi, Takafumi Koide, Yusuke Fukuda, Katsuyuki Kitajima, Yasuhisa Morooka
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Patent number: 10100176Abstract: A resin particle composition includes resin particles, inorganic particles surface-treated with oil, and silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40.Type: GrantFiled: July 12, 2016Date of Patent: October 16, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Sakae Takeuchi, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Yasuo Kadokura, Tomohito Nakajima, Takeshi Iwanaga, Shunsuke Nozaki, Yuka Zenitani, Yoshifumi Eri, Yasuhisa Morooka
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Publication number: 20180275596Abstract: An image forming apparatus includes an image forming unit including an image carrier, a developing device that includes a developer containing a toner, and a cleaning device including a blade; and a transfer device. The toner contains toner particles having a volume-average particle size of 3 ?m or more and 5 ?m or less, a spherical inorganic external additive having a number-average particle size of 80 nm to 200 nm, and an organic component. In the cleaning device, an external additive residue in or near a contact region between the image carrier and the blade contains the organic component and an inorganic component, the area ratio of the organic component to the inorganic component is 3/7 or more and 7/3 or less, and the area ratio of the inorganic component that is spherical to the external additive residue is 30% or more.Type: ApplicationFiled: July 14, 2017Publication date: September 27, 2018Applicant: FUJI XEROX CO., LTD.Inventors: Makoto KAMISAKI, Manabu FURUKI, Naoki OTA, Tatsuhiro IGARASHI, Yasuhisa MOROOKA, Jun SEKIYA
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Patent number: 10081718Abstract: A resin particle composition includes resin particles, polishing agent particles having an average circle-equivalent diameter of 0.1 ?m to 3.0 ?m, and silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40.Type: GrantFiled: July 25, 2016Date of Patent: September 25, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Sakae Takeuchi, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Yasuo Kadokura, Takeshi Iwanaga, Shunsuke Nozaki, Yasuhisa Morooka
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Patent number: 10061216Abstract: An electrostatic image developing toner contains: toner particles, first silica particles having an average equivalent circle diameter of 10 nm to 120 nm and second silica particles having a compressive agglomeration degree of 60% to 95%, a particle compression ratio of 0.20 to 0.40 and an average equivalent circle diameter being greater than the average equivalent circle diameter of the first silica particles.Type: GrantFiled: August 1, 2016Date of Patent: August 28, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Yuka Zenitani, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yoshifumi Eri, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura, Yasuhisa Morooka
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Patent number: 9983494Abstract: An image forming apparatus includes an electrophotographic photoreceptor having an overcoat layer and a cleaning unit that includes a cleaning blade, a tip of which contacts with the electrophotographic photoreceptor, wherein the toner contains a toner particle which contains a binder resin containing a crystalline polyester resin, a colorant and a release agent, and an external additive, and the toner satisfies the following Expression: 2?tan ?P1?2.5, wherein tan ?P1 represents a maximum value of a mechanical loss tangent existing in a range where a complex elastic modulus is from 1×106 Pa to 1×108 Pa, which is measured at an angular frequency of 6.28 rad/sec and a strain amount of 0.3%.Type: GrantFiled: February 7, 2017Date of Patent: May 29, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Yusuke Fukuda, Masataka Kuribayashi, Naoki Ota, Takafumi Koide, Katsuyuki Kitajima, Yasuhisa Morooka
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Patent number: 9983517Abstract: An image forming apparatus includes a guide unit that guides at least one of an image holding member and an intermediate transfer member to a primary transfer position provided by a primary transfer unit such that a portion of the surface of the image holding member and a portion of the surface of the intermediate transfer member are disposed along with each other, wherein a toner contains a toner particle which contains a binder resin containing a crystalline polyester resin, a coloring agent and a releasing agent, and an external additive, and satisfies Expression: 2?tan ?P1?2.5, wherein tan ?P1 represents a maximum value of a mechanical loss tangent existing in a range where a complex elastic modulus is from 1×106 Pa to 1×108 Pa, which is measured at an angular frequency of 6.28 rad/sec and a strain amount of 0.3%.Type: GrantFiled: February 7, 2017Date of Patent: May 29, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Takafumi Koide, Naoki Ota, Masataka Kuribayashi, Yusuke Fukuda, Yasuhisa Morooka, Katsuyuki Kitajima
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Patent number: 9964877Abstract: An image forming apparatus includes an electrophotographic photoreceptor having an overcoat layer and a cleaning unit that includes a cleaning blade and a tip of the cleaning blade contacts with the photoreceptor toward the direction opposite to the rotation direction, wherein the toner particle contains a crystalline polyester resin, an average circularity of the toner particles is from 0.955 to 0.971, a content ratio of the toner particles having a particle diameter of 4.5 ?m or more and less than 7.5 ?m and a circularity of 0.980 or more is from 16% by number to 40% by number, and a content ratio of the toner particles having a particle diameter of 7.5 ?m or more and less than 15 ?m and a circularity of 0.900 or more and less than 0.940 is 3% by number or less.Type: GrantFiled: February 2, 2017Date of Patent: May 8, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Masataka Kuribayashi, Naoki Ota, Takafumi Koide, Yusuke Fukuda, Katsuyuki Kitajima, Yasuhisa Morooka
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Patent number: 9946178Abstract: A toner for electrostatic image development includes toner particles; and an external additive containing silica particles and polytetrafluorethylene particles, the silica particles having a compression-aggregation degree of 60% or more and 95% or less and a particle compression ratio of 0.20 or more and 0.40 or less.Type: GrantFiled: July 25, 2016Date of Patent: April 17, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Yasuo Kadokura, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Yasuhisa Morooka, Shunsuke Nozaki, Takeshi Iwanaga, Sakae Takeuchi
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Patent number: 9904197Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin, and an external additive including silica particles having a compression aggregation degree is from 60% to 95% and a particle compression ratio is from 0.20 to 0.40, and resin particles containing a polymer obtained by polymerizing a (meth)acrylic acid ester monomer.Type: GrantFiled: July 21, 2016Date of Patent: February 27, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Yoshifumi Eri, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura, Yasuhisa Morooka
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Patent number: 9891543Abstract: An electrostatic charge image developing toner includes toner particles and an external additive that includes silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40 and fatty acid metal salt particles.Type: GrantFiled: July 15, 2016Date of Patent: February 13, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Yasuo Kadokura, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Yasuhisa Morooka, Shunsuke Nozaki, Takeshi Iwanaga, Sakae Takeuchi
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Patent number: 9885966Abstract: An electrostatic charge image developing toner containing: toner particles; and silica particles having a compaction aggregation degree of from 60% to 95% and a particle compaction ratio of from 0.20 to 0.40, an electrostatic charge image developer containing the electrostatic charge image developing toner, and a toner cartridge that accommodates the electrostatic charge image developing toner and is detachable from an image forming apparatus.Type: GrantFiled: August 30, 2016Date of Patent: February 6, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Tomohito Nakajima, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Yuka Zenitani, Yoshifumi Eri, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura, Yasuhisa Morooka
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Patent number: 9874836Abstract: An image forming apparatus includes an image holding member, a developing unit that contains a developer containing toner particles and develops an electrostatic latent image formed on a surface of the image holding member with the developer to form a toner image, a primary transfer unit that transfers the toner image formed on the image holding member to an intermediate transfer member, a second transfer unit that transfers the toner image transferred on the intermediate transfer member to a recording medium, and a guide unit that guides at least one of the image holding member and the intermediate transfer member to a primary transfer position such that a portion of the image holding member and a portion of the intermediate transfer member are disposed along with each other, wherein the specific toner defined in the specification is used.Type: GrantFiled: January 31, 2017Date of Patent: January 23, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Katsuyuki Kitajima, Naoki Ota, Masataka Kuribayashi, Takafumi Koide, Yusuke Fukuda, Yasuhisa Morooka
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Patent number: 9864287Abstract: An electrostatic charge image developing toner includes kneaded and pulverized toner particles that contain a binder resin and a release agent, the release agent being partially exposed, and an external additive that contains silica particles having a compression aggregation degree of from 60% to 95% and a particle compression ratio of from 0.20 to 0.40.Type: GrantFiled: July 26, 2016Date of Patent: January 9, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Yoshifumi Iida, Hiroyoshi Okuno, Satoshi Inoue, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura, Yasuhisa Morooka
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Publication number: 20180004107Abstract: An image forming apparatus includes an electrophotographic photoreceptor having an overcoat layer and a cleaning unit that includes a cleaning blade and a tip of the cleaning blade contacts with the photoreceptor toward the direction opposite to the rotation direction, wherein the toner particle contains a crystalline polyester resin, an average circularity of the toner particles is from 0.955 to 0.971, a content ratio of the toner particles having a particle diameter of 4.5 ?m or more and less than 7.5 ?m and a circularity of 0.980 or more is from 16% by number to 40% by number, and a content ratio of the toner particles having a particle diameter of 7.5 ?m or more and less than 15 ?m and a circularity of 0.900 or more and less than 0.940 is 3% by number or less.Type: ApplicationFiled: February 2, 2017Publication date: January 4, 2018Applicant: FUJI XEROX CO., LTD.Inventors: Masataka KURIBAYASHI, Naoki OTA, Takafumi KOIDE, Yusuke FUKUDA, Katsuyuki KITAJIMA, Yasuhisa MOROOKA
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Publication number: 20180004150Abstract: An image forming apparatus includes an electrophotographic photoreceptor having an overcoat layer and a cleaning unit that includes a cleaning blade, a tip of which contacts with the electrophotographic photoreceptor, wherein the toner contains a toner particle which contains a binder resin containing a crystalline polyester resin, a colorant and a release agent, and an external additive, and the toner satisfies the following Expression: 2?tan ?P1?2.5, wherein tan ?P1 represents a maximum value of a mechanical loss tangent existing in a range where a complex elastic modulus is from 1×106 Pa to 1×108 Pa, which is measured at an angular frequency of 6.28 rad/sec and a strain amount of 0.3%.Type: ApplicationFiled: February 7, 2017Publication date: January 4, 2018Applicant: FUJI XEROX CO., LTD.Inventors: Yusuke FUKUDA, Masataka KURIBAYASHI, Naoki OTA, Takafumi KOIDE, Katsuyuki KITAJIMA, Yasuhisa MOROOKA
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Publication number: 20180004128Abstract: An image forming apparatus includes an image holding member, a developing unit that contains a developer containing toner particles and develops an electrostatic latent image formed on a surface of the image holding member with the developer to form a toner image, a primary transfer unit that transfers the toner image formed on the image holding member to an intermediate transfer member, a second transfer unit that transfers the toner image transferred on the intermediate transfer member to a recording medium, and a guide unit that guides at least one of the image holding member and the intermediate transfer member to a primary transfer position such that a portion of the image holding member and a portion of the intermediate transfer member are disposed along with each other, wherein the specific toner defined in the specification is used.Type: ApplicationFiled: January 31, 2017Publication date: January 4, 2018Applicant: FUJI XEROX CO., LTD.Inventors: Katsuyuki KITAJIMA, Naoki OTA, Masataka KURIBAYASHI, Takafumi KOIDE, Yusuke FUKUDA, Yasuhisa MOROOKA