Patents by Inventor Norihito Naito
Norihito Naito 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: 11714365Abstract: When, in a state where a developer borne by a developer bearing member is sandwiched by an opposing portion of an image bearing member and the developer bearing member, C denotes capacitance between the image bearing member and the developer bearing member, ?V denotes a development contrast, Q/S denotes a charge amount per unit area of the developer borne by the developer bearing member, and ?v denotes a peripheral velocity ratio which is a ratio of a peripheral velocity of the developer bearing member to a peripheral velocity of the image bearing member, a first peripheral velocity ratio is set so that |Q/S×?v|?|C×?V| is satisfied, and a second peripheral velocity ratio which is larger than the first peripheral velocity ratio is set so that |Q/S×?v|>|C×?V| is satisfied.Type: GrantFiled: July 13, 2021Date of Patent: August 1, 2023Assignee: CANON KABUSHIKI KAISHAInventors: Norihito Naito, Go Shindo, Masataka Mochizuki
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Publication number: 20210341853Abstract: When, in a state where a developer borne by a developer bearing member is sandwiched by an opposing portion of an image bearing member and the developer bearing member, C denotes capacitance between the image bearing member and the developer bearing member, ?V denotes a development contrast, Q/S denotes a charge amount per unit area of the developer borne by the developer bearing member, and ?v denotes a peripheral velocity ratio which is a ratio of a peripheral velocity of the developer bearing member to a peripheral velocity of the image bearing member, a first peripheral velocity ratio is set so that |Q/S×?v|?|C×?V| is satisfied, and a second peripheral velocity ratio which is larger than the first peripheral velocity ratio is set so that |Q/S×?v|>|C×?V| is satisfied.Type: ApplicationFiled: July 13, 2021Publication date: November 4, 2021Inventors: Norihito Naito, Go Shindo, Masataka Mochizuki
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Patent number: 11086249Abstract: An image forming apparatus includes a motor configured to rotationally drive an image bearing roller and a developer bearing roller at a first peripheral velocity ratio and a second peripheral velocity ratio which is larger than the first peripheral velocity ratio. A development contrast formed between a developing bias to the developer bearing roller and a light-part potential formed on the image bearing roller in a case where a development operation is performed at the second peripheral velocity ratio is larger than a development contrast formed between the developing bias to the developer bearing roller and the light-part potential formed on the image bearing roller in a case where the development operation is performed at the first peripheral velocity ratio.Type: GrantFiled: February 25, 2020Date of Patent: August 10, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Norihito Naito, Go Shindo, Masataka Mochizuki
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Publication number: 20200192237Abstract: When, in a state where a developer borne by a developer bearing member is sandwiched by an opposing portion of an image bearing member and the developer bearing member, C denotes capacitance between the image bearing member and the developer bearing member, ?V denotes a development contrast, Q/S denotes a charge amount per unit area of the developer borne by the developer bearing member, and ?v denotes a peripheral velocity ratio which is a ratio of a peripheral velocity of the developer bearing member to a peripheral velocity of the image bearing member, a first peripheral velocity ratio is set so that |Q/S×?v|?|C×?V| is satisfied, and a second peripheral velocity ratio which is larger than the first peripheral velocity ratio is set so that |Q/S×?v|>|C×?V| is satisfied.Type: ApplicationFiled: February 25, 2020Publication date: June 18, 2020Inventors: Norihito Naito, Go Shindo, Masataka Mochizuki
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Patent number: 10599063Abstract: In a state where a developer borne by a developer bearing member is sandwiched by an opposing portion of an image bearing member and the developer bearing member, C denotes capacitance between the image bearing member and the developer bearing member, ?V denotes a development contrast, Q/S denotes a charge amount per unit area of the developer borne by the developer bearing member, and Av denotes a peripheral velocity ratio, which is a ratio of a peripheral velocity of the developer bearing member to a peripheral velocity of the image bearing member. A first peripheral velocity ratio is set so that |Q/S×?v|?|C×?V| is satisfied, and a second peripheral velocity ratio which is larger than the first peripheral velocity ratio is set so that |Q/S×?v|>|C×?V| is satisfied.Type: GrantFiled: March 17, 2017Date of Patent: March 24, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Norihito Naito, Go Shindo, Masataka Mochizuki
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Patent number: 10520852Abstract: An image forming apparatus includes an image bearing member on which an electrostatic latent image is formable, and a developing device including a developer carrying member, a container, and a supply roller. When the developing device including the developer carrying member, to which a lubricant different from the developer is applied, is used for the first time, a first initial operation of transferring the lubricant from the developer carrying member to the image bearing member together with the developer is performed. The image forming apparatus further includes a storage unit configured to store a suspension state when suspension is detected before the initial operation completes, and a controller configured to execute a second initial operation as an operation of resuming the suspended first initial operation on the basis of the stored suspension state.Type: GrantFiled: September 13, 2018Date of Patent: December 31, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Masataka Mochizuki, Hisashi Yamauchi, Norihito Naito
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Patent number: 10466634Abstract: An image forming apparatus includes: an image bearing member; a developer carrying member configured to contact with the image bearing member and to be separated from the image bearing member; a control unit for controlling the image bearing member and the developer carrying member; and a contact member disposed in contact with the image bearing member. The control unit is configured to sequentially execute: (1) rotating the image bearing member at a first speed in a separated state; (2) switching the image bearing member and the developer carrying member from the separated state to a contact state in a state in which the image bearing member rotates at the first speed; and (3) rotating the image bearing member by decreasing a rotation speed of the image bearing member from the first speed to a second speed smaller than the first speed in the contact state.Type: GrantFiled: September 25, 2018Date of Patent: November 5, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Hisashi Yamauchi, Masataka Mochizuki, Norihito Naito
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Publication number: 20190101844Abstract: An image forming apparatus includes: an image bearing member on which an electrostatic latent image is formable; and a developing device including a developer carrying member, a container, and a supply roller, wherein when the developing device including the developer carrying member, to which a lubricant different from the developer is applied, is used for the first time, a first initial operation of transferring the lubricant from the developer carrying member to the image bearing member together with the developer is performed, and wherein the image forming apparatus further includes: a storage unit configured to store a suspension state when suspension is detected before the initial operation completes; and a controller configured to execute a second initial operation as an operation of resuming the suspended first initial operation on the basis of the stored suspension state.Type: ApplicationFiled: September 13, 2018Publication date: April 4, 2019Inventors: Masataka Mochizuki, Hisashi Yamauchi, Norihito Naito
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Publication number: 20190101855Abstract: An image forming apparatus includes: an image bearing member; a developer carrying member configured to contact with the image bearing member and to be separated from the image bearing member; a control unit for controlling the image bearing member and the developer carrying member; and a contact member disposed in contact with the image bearing member. The control unit is configured to sequentially execute: (1) rotating the image bearing member at a first speed in a separated state; (2) switching the image bearing member and the developer carrying member from the separated state to a contact state in a state in which the image bearing member rotates at the first speed; and (3) rotating the image bearing member by decreasing a rotation speed of the image bearing member from the first speed to a second speed smaller than the first speed in the contact state.Type: ApplicationFiled: September 25, 2018Publication date: April 4, 2019Inventors: Hisashi Yamauchi, Masataka Mochizuki, Norihito Naito
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Patent number: 10146150Abstract: At least one partial measurement region is set in the longitudinal direction in a printable region of a photosensitive drum. After the photosensitive drum has been charged to a constant potential with a charging roller, different potentials are set in the partial measurement region and a region excluding the partial measurement region with a laser scanner, partial discharge information of the partial measurement region is detected by a discharge information detection unit, and a bias voltage in image formation that is applied to the charging roller is corrected on the basis of the value of the partial discharge information.Type: GrantFiled: May 25, 2017Date of Patent: December 4, 2018Assignee: Canon Kabushiki KaishaInventors: Kosuke Ikada, Norihito Naito, Takayoshi Kihara, Masataka Mochizuki
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Patent number: 10018939Abstract: Changing of a peripheral speed ratio, resulting in change of the developer amount per unit area, enables the detection unit to detect the developer amount with sufficient accuracy.Type: GrantFiled: February 15, 2017Date of Patent: July 10, 2018Assignee: Canon Kabushiki KaishaInventors: Go Shindo, Norihito Naito, Masataka Mochizuki, Akihiko Uchiyama
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Patent number: 10001719Abstract: An image forming apparatus includes: an acquisition portion that acquires, based on a current value detected by a detection unit, a discharge start voltage value between a photosensitive body and a charging member, in a voltage value of a voltage applied to the charging member, the discharge start voltage value being acquired from at least one of a plurality of measurement regions set by dividing an image forming region of the photosensitive body, in which an electrostatic image is formed, into a plurality of regions in a longitudinal direction orthogonal to a recording material conveyance direction; and a control portion that performs unevenness suppression control to reduce unevenness, in the longitudinal direction, of density of a developer image transferred onto the recording material based on the discharge start voltage value.Type: GrantFiled: September 30, 2016Date of Patent: June 19, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Takayoshi Kihara, Kosuke Ikada, Masataka Mochizuki, Norihito Naito
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Patent number: 10001721Abstract: An image forming apparatus includes a control unit configured to change, to a light quantity different from a plurality of reference light quantities, a light quantity per unit area of a surface of an electrical charge retention layer of a photosensitive member when an exposure unit exposes the surface in correspondence with a plurality of gradation levels, based on a plurality of exposure potentials corresponding to the plurality of gradation levels which is acquired by exposing with the exposure unit the surface with each of the plurality of reference light quantities corresponding to the plurality of gradation levels, and measuring with the measurement unit the plurality of exposure potentials of the photosensitive member which is formed by the exposure with the plurality of reference light quantities.Type: GrantFiled: August 7, 2017Date of Patent: June 19, 2018Assignee: Canon Kabushiki KaishaInventors: Norihito Naito, Masataka Mochizuki, Takayoshi Kihara, Kosuke Ikada
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Publication number: 20180046109Abstract: An image forming apparatus includes a control unit configured to change, to a light quantity different from a plurality of reference light quantities, a light quantity per unit area of a surface of an electrical charge retention layer of a photosensitive member when an exposure unit exposes the surface in correspondence with a plurality of gradation levels, based on a plurality of exposure potentials corresponding to the plurality of gradation levels which is acquired by exposing with the exposure unit the surface with each of the plurality of reference light quantities corresponding to the plurality of gradation levels, and measuring with the measurement unit the plurality of exposure potentials of the photosensitive member which is formed by the exposure with the plurality of reference light quantities.Type: ApplicationFiled: August 7, 2017Publication date: February 15, 2018Inventors: Norihito Naito, Masataka Mochizuki, Takayoshi Kihara, Kosuke Ikada
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Publication number: 20170351192Abstract: At least one partial measurement region is set in the longitudinal direction in a printable region of a photosensitive drum 3. After the photosensitive drum 3 has been charged to a constant potential with a charging roller 6, different potentials are set in the partial measurement region and a region excluding partial measurement region with a laser scanner 4, partial discharge information of the partial measurement region is detected by discharge information detection unit, and a bias voltage in image formation that is applied to the charging roller 6 is corrected on the basis of the value of the partial discharge information.Type: ApplicationFiled: May 25, 2017Publication date: December 7, 2017Inventors: Kosuke Ikada, Norihito Naito, Takayoshi Kihara, Masataka Mochizuki
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Publication number: 20170277068Abstract: When, in a state where a developer borne by a developer bearing member is sandwiched by an opposing portion of an image bearing member and the developer bearing member, C denotes capacitance between the image bearing member and the developer bearing member, ?V denotes a development contrast, Q/S denotes a charge amount per unit area of the developer borne by the developer bearing member, and ?v denotes a peripheral velocity ratio which is a ratio of a peripheral velocity of the developer bearing member to a peripheral velocity of the image bearing member, a first peripheral velocity ratio is set so that |Q/S×?v|?|C×?V| is satisfied, and a second peripheral velocity ratio which is larger than the first peripheral velocity ratio is set so that |Q/S×?v|>|C×?V| is satisfied.Type: ApplicationFiled: March 17, 2017Publication date: September 28, 2017Inventors: Norihito Naito, Go Shindo, Masataka Mochizuki
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Patent number: 9766571Abstract: A developing device configured to develop a latent image formed on an image bearing member includes a rotatable developing-agent bearing member configured to bear developing agent, a developing container configured to form a developing-agent storage chamber that stores the developing agent, a developing-agent regulating portion provided in the developing container to regulate an amount of the developing agent born on the developing-agent bearing member, a support portion configured to support the developing-agent bearing member movably relative to the developing-agent regulating portion, and a pressurizing member configured to pressurize the developing-agent bearing member toward the developing-agent regulating portion. A contact portion of the developing-agent regulating portion with the developing-agent bearing member is fixed to the developing container without forming a gap from the developing container on a downstream side in a pressurizing direction of the pressurizing member.Type: GrantFiled: October 29, 2015Date of Patent: September 19, 2017Assignee: Canon Kabushiki KaishaInventors: Daisuke Baba, Makoto Tokudome, Masao Uyama, Yuichiro Hirata, Kodai Hayashi, Keisuke Mochizuki, Norihito Naito
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Publication number: 20170235249Abstract: Changing of a peripheral speed ratio, resulting in change of the developer amount per unit area, enables the detection unit to detect the developer amount with sufficient accuracy.Type: ApplicationFiled: February 15, 2017Publication date: August 17, 2017Inventors: Go Shindo, Norihito Naito, Masataka Mochizuki, Akihiko Uchiyama
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Patent number: 9651891Abstract: When an edge effect or sweeping occurs in a developing material, pixels, among a plurality of pixels that configure image data, will arise in which a developing material consumption amount rises beyond an original consumption amount. A CPU corrects the developing material consumption amount for the pixels, among the plurality of pixels that configure the image data, in which the developing material consumption amount will rise beyond the original consumption amount.Type: GrantFiled: July 8, 2016Date of Patent: May 16, 2017Assignee: Canon Kabushiki KaishaInventors: Go Araki, Norihito Naito
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Publication number: 20170097585Abstract: An image forming apparatus includes: an acquisition portion that acquires, based on a current value detected by a detection unit, a discharge start voltage value between a photosensitive body and a charging member, in a voltage value of a voltage applied to the charging member, the discharge start voltage value being acquired from at least one of a plurality of measurement regions set by dividing an image forming region of the photosensitive body, in which an electrostatic image is formed, into a plurality of regions in a longitudinal direction orthogonal to a recording material conveyance direction; and a control portion that performs unevenness suppression control to reduce unevenness, in the longitudinal direction, of density of a developer image transferred onto the recording material based on the discharge start voltage value.Type: ApplicationFiled: September 30, 2016Publication date: April 6, 2017Inventors: Takayoshi Kihara, Kosuke Ikada, Masataka Mochizuki, Norihito Naito