Patents by Inventor Mitsunari Ito
Mitsunari Ito 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: 8718505Abstract: The high-voltage output apparatus includes a voltage application part that applies a DC voltage to the charge member; a current detection part that detects a value of a current flowing in the image bearing member when the DC voltage is applied to the charge member; and a control part that calculates a plurality of discharge start voltages for the image bearing member, based on a plurality of current values detected by the current detection part as a result of the voltage application part applying a plurality of different DC voltages to the charge member, and controls the DC voltage applied to the charge member, using the plurality of calculated discharge start voltages. Consequently, a high-quality image can be formed by maintaining a potential on a photosensitive drum to be constant irrespective of the states of the circumstances and/or the drum layer thickness.Type: GrantFiled: August 28, 2013Date of Patent: May 6, 2014Assignee: Canon Kabushiki KaishaInventors: Shiro Sakata, Yusuke Saito, Mitsunari Ito
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Publication number: 20130343776Abstract: The high-voltage output apparatus includes a voltage application part that applies a DC voltage to the charge member; a current detection part that detects a value of a current flowing in the image bearing member when the DC voltage is applied to the charge member; and a control part that calculates a plurality of discharge start voltages for the image bearing member, based on a plurality of current values detected by the current detection part as a result of the voltage application part applying a plurality of different DC voltages to the charge member, and controls the DC voltage applied to the charge member, using the plurality of calculated discharge start voltages. Consequently, a high-quality image can be formed by maintaining a potential on a photosensitive drum to be constant irrespective of the states of the circumstances and/or the drum layer thickness.Type: ApplicationFiled: August 28, 2013Publication date: December 26, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Shiro Sakata, Yusuke Saito, Mitsunari Ito
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Patent number: 8548348Abstract: The high-voltage output apparatus includes a voltage application part that applies a DC voltage to the charge member; a current detection part that detects a value of a current flowing in the image bearing member when the DC voltage is applied to the charge member; and a control part that calculates a plurality of discharge start voltages for the image bearing member, based on a plurality of current values detected by the current detection part as a result of the voltage application part applying a plurality of different DC voltages to the charge member, and controls the DC voltage applied to the charge member, using the plurality of calculated discharge start voltages. Consequently, a high-quality image can be formed by maintaining a potential on a photosensitive drum to be constant irrespective of the states of the circumstances and/or the drum layer thickness.Type: GrantFiled: March 2, 2011Date of Patent: October 1, 2013Assignee: Canon Kabushiki KaishaInventors: Shiro Sakata, Yusuke Saito, Mitsunari Ito
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Patent number: 8543021Abstract: The image forming apparatus calculates a surface voltage of an image bearing member based on a first charge start voltage, which is obtained when a first voltage application section applies a first DC voltage to a charge section, and a second charge start voltage, which is obtained when a second voltage application section applies a second DC voltage to the charge section. This allows a high-quality image to be formed irrespective of a change in circumstance or drum layer thickness.Type: GrantFiled: June 27, 2011Date of Patent: September 24, 2013Assignee: Canon Kabushiki KaishaInventors: Shiro Sakata, Yusuke Saito, Mitsunari Ito
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Patent number: 8342514Abstract: Sheets fed out from a sheet feeding portion, which is brought into pressure contact with the sheets by the upward movement of a sheet stacking portion to feed out the sheets, are separated and conveyed one by one while being upwardly curved. During the sheet feeding operation, the sheet stacking portion is sequentially moved up, and when the sheet feeding operation is completed, the sheet stacking portion is moved down. Further, a remaining amount indicating member moved with the upward movement of the sheet stacking portion to indicate the remaining amount of sheets is held at a position before the sheet stacking portion is moved down, by a holding mechanism, when the sheet feeding operation is completed and the sheet stacking portion is moved down.Type: GrantFiled: June 10, 2010Date of Patent: January 1, 2013Assignee: Canon Kabushiki KaishaInventors: Hisayuki Tomura, Kei Sawanaka, Akio Nemoto, Kazushi Nishikata, Masato Suzuki, Atsuya Takahashi, Shotaro Yoshimura, Mitsunari Ito
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Publication number: 20120002989Abstract: The image forming apparatus calculates a surface voltage of an image bearing member based on a first charge start voltage, which is obtained when a first voltage application section applies a first DC voltage to a charge section, and a second charge start voltage, which is obtained when a second voltage application section applies a second DC voltage to the charge section. This allows a high-quality image to be formed irrespective of a change in circumstance or drum layer thickness.Type: ApplicationFiled: June 27, 2011Publication date: January 5, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Shiro Sakata, Yusuke Saito, Mitsunari Ito
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Publication number: 20110217064Abstract: The high-voltage output apparatus includes a voltage application part that applies a DC voltage to the charge member; a current detection part that detects a value of a current flowing in the image bearing member when the DC voltage is applied to the charge member; and a control part that calculates a plurality of discharge start voltages for the image bearing member, based on a plurality of current values detected by the current detection part as a result of the voltage application part applying a plurality of different DC voltages to the charge member, and controls the DC voltage applied to the charge member, using the plurality of calculated discharge start voltages. Consequently, a high-quality image can be formed by maintaining a potential on a photosensitive drum to be constant irrespective of the states of the circumstances and/or the drum layer thickness.Type: ApplicationFiled: March 2, 2011Publication date: September 8, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Shiro Sakata, Yusuke Saito, Mitsunari Ito
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Publication number: 20100244365Abstract: Sheets fed out from a sheet feeding portion, which is brought into pressure contact with the sheets by the upward movement of a sheet stacking portion to feed out the sheets, are separated and conveyed one by one while being upwardly curved. During the sheet feeding operation, the sheet stacking portion is sequentially moved up, and when the sheet feeding operation is completed, the sheet stacking portion is moved down. Further, a remaining amount indicating member moved with the upward movement of the sheet stacking portion to indicate the remaining amount of sheets is held at a position before the sheet stacking portion is moved down, by a holding mechanism, when the sheet feeding operation is completed and the sheet stacking portion is moved down.Type: ApplicationFiled: June 10, 2010Publication date: September 30, 2010Applicant: CANON KABUSHIKI KAISHAInventors: HISAYUKI TOMURA, KEI SAWANAKA, AKIO NEMOTO, KAZUSHI NISHIKATA, MASATO SUZUKI, ATSUYA TAKAHASHI, SHOTARO YOSHIMURA, MITSUNARI ITO
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Patent number: 7758042Abstract: Sheets fed out from a sheet feeding portion, which is brought into pressure contact with the sheets by the upward movement of a sheet stacking portion to feed out the sheets, are separated and conveyed one by one while being upwardly curved. During the sheet feeding operation, the sheet stacking portion is sequentially moved up, and when the sheet feeding operation is completed, the sheet stacking portion is moved down. Further, a remaining amount indicating member moved with the upward movement of the sheet stacking portion to indicate the remaining amount of sheets is held at a position before the sheet stacking portion is moved down, by a holding mechanism, when the sheet feeding operation is completed and the sheet stacking portion is moved down.Type: GrantFiled: January 17, 2007Date of Patent: July 20, 2010Assignee: Canon Kabushiki KaishaInventors: Hisayuki Tomura, Kei Sawanaka, Akio Nemoto, Kazushi Nishikata, Masato Suzuki, Atsuya Takahashi, Shotaro Yoshimura, Mitsunari Ito
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Publication number: 20070182088Abstract: Sheets fed out from a sheet feeding portion, which is brought into pressure contact with the sheets by the upward movement of a sheet stacking portion to feed out the sheets, are separated and conveyed one by one while being upwardly curved. During the sheet feeding operation, the sheet stacking portion is sequentially moved up, and when the sheet feeding operation is completed, the sheet stacking portion is moved down. Further, a remaining amount indicating member moved with the upward movement of the sheet stacking portion to indicate the remaining amount of sheets is held at a position before the sheet stacking portion is moved down, by a holding mechanism, when the sheet feeding operation is completed and the sheet stacking portion is moved down.Type: ApplicationFiled: January 17, 2007Publication date: August 9, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Hisayuki Tomura, Kei Sawanaka, Akio Nemoto, Kazushi Nishikata, Masato Suzuki, Atsuya Takahashi, Shotaro Yoshimura, Mitsunari Ito
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Publication number: 20030142367Abstract: An image reader including an optical reading section that reads reflected light from a light source; a reference density member that is fixedly installed at an original document reading position, and that is read by the optical reading section for acquiring data for correcting the light amount of the light source; a correction coefficient setting section that sets a correction coefficient for every read page, based on reference data obtained by reading the reference density member in advance, and read data obtained by reading the reference density member during each time interval between two successive pages of the original documents fed to the original document reading position one page after another; and a light amount correction section that performs light amount correction according to the above-described correction coefficient corresponding a read page, for each of the pages of the original document images read by the optical reading section.Type: ApplicationFiled: January 22, 2003Publication date: July 31, 2003Applicant: CANON KABUSHIKI KAISHAInventor: Mitsunari Ito