Patents by Inventor Ryohei Terada
Ryohei Terada 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: 10481521Abstract: A developing device includes a rotatable developing member configured to carry a developer containing toner and a carrier to a developing position, a first frame configured to accommodate the developer, a second frame mounted on the first frame and configured to cover part of an outer peripheral surface of the rotatable developing member, and a cover portion provided opposite to the rotatable developing member. The following relationship is satisfied: L1?L2+L3, and L2?L3, where with respect to the radial direction of the rotatable developing member, L1 is a minimum of the clearance formed between the second frame and the rotatable developing member, L2 is a minimum of the clearance formed between the rotatable developing member and the cover portion, and L3 is a minimum of the clearance formed between the second frame and the cover portion.Type: GrantFiled: March 20, 2018Date of Patent: November 19, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Yukihiro Soeta, Masafumi Takahashi, Ryohei Terada, Yushi Sadamitsu, Yasuhiro Shimoi, Yutaka Koga
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Patent number: 10452003Abstract: A developing apparatus includes a developing container, a rotatable developer bearing member, a magnet, and a wall portion. The magnet is provided in the developer bearing member and has a first magnetic pole and a second magnetic pole of the same polarity as the first magnetic pole. The second magnetic pole is adjacent to and downstream of the first magnetic pole in a rotation direction of the developer bearing member. The wall portion is disposed to face the developer bearing member in an area downstream of the first magnetic pole and upstream of the second magnetic pole in the rotation direction and is configured such that gaps between the wall portion and respective end portions of a developer bearing area in a rotation axis direction of the developer bearing member are smaller than a gap between the wall portion and a center portion of the developer bearing area.Type: GrantFiled: December 11, 2018Date of Patent: October 22, 2019Assignee: CANON KABUSHIKI KAISHAInventor: Ryohei Terada
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Patent number: 10416592Abstract: A development device includes a power source capable of applying a second voltage higher than a first voltage to be applied to a developer bearing member, a scattering prevention electrode that is arranged opposite the developer bearing member and to which the second voltage is applied from the power source, and a step-down circuit. The step-down circuit steps down a voltage from the power source from the second voltage to the first voltage to apply the stepped-down voltage to the developer bearing member.Type: GrantFiled: March 27, 2019Date of Patent: September 17, 2019Assignee: Canon Kabushiki KaishaInventor: Ryohei Terada
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Publication number: 20190219950Abstract: A development device includes a power source capable of applying a second voltage higher than a first voltage to be applied to a developer bearing member, a scattering prevention electrode that is arranged opposite the developer bearing member and to which the second voltage is applied from the power source, and a step-down circuit. The step-down circuit steps down a voltage from the power source from the second voltage to the first voltage to apply the stepped-down voltage to the developer bearing member.Type: ApplicationFiled: March 27, 2019Publication date: July 18, 2019Inventor: Ryohei Terada
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Patent number: 10331061Abstract: A developing device includes a rotatable developing member carrying a developer containing toner and a carrier to a developing position and a magnet provided fixedly inside the rotatable developing member and including first and second magnetic poles. A cover portion opposes the rotatable developing member. A most upstream end of the cover portion is positioned downstream of an uppermost position of the rotatable developing member and upstream of a most upstream position of a half-width of magnetic flux density of the first magnetic pole, and a most downstream end of the cover portion is positioned downstream of a first peak position and upstream of a position where the magnetic flux density of the first magnetic pole is a minimum on a side downstream of the first peak position and upstream of a second peak position where magnetic flux density of the second magnetic pole is a maximum.Type: GrantFiled: March 20, 2018Date of Patent: June 25, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Masafumi Takahashi, Ryohei Terada, Yushi Sadamitsu, Yasuhiro Shimoi, Yutaka Koga, Yukihiro Soeta
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Publication number: 20190187590Abstract: A developing apparatus includes a developing container, a rotatable developer bearing member, a magnet, and, a wall portion. The magnet is provided in the developer bearing member and has a first magnetic pole and a second magnetic pole of the same polarity as the first magnetic pole. The second magnetic pole is adjacent to and downstream of the first magnetic pole in a rotation direction of the developer bearing member. The wall portion is disposed to face the developer bearing member in an area downstream the first magnetic pole and upstream the second magnetic pole in the rotation direction and is configured such that gaps between the wall portion and respective end portions of a developer bearing area in a rotation axis direction of the developer bearing member are smaller than a gap between the wall portion and a center portion of the developer bearing area.Type: ApplicationFiled: December 11, 2018Publication date: June 20, 2019Inventor: Ryohei Terada
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Patent number: 10289030Abstract: A development device includes a power source capable of applying a second voltage higher than a first voltage to be applied to a developer bearing member, a scattering prevention electrode that is arranged opposite the developer bearing member and to which the second voltage is applied from the power source, and a step-down circuit. The step-down circuit steps down a voltage from the power source from the second voltage to the first voltage to apply the stepped-down voltage to the developer bearing member.Type: GrantFiled: March 6, 2018Date of Patent: May 14, 2019Assignee: Canon Kabushiki KaishaInventor: Ryohei Terada
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Patent number: 10274880Abstract: An image forming apparatus includes a controller to control a driving unit that rotates a developing rotary member. Rotation speed of the developing rotary member is controlled to become a first rotation speed in an image forming period. Rotation speed of the developing rotary member is decelerated from the first rotation speed in a first period of a non-image forming period so that the rotation speed becomes a second rotation speed lower than the first rotation speed, and rotation speed is decelerated from the second rotation speed in a second period subsequent to the first period of the non-image forming period so that the rotation of the developing rotary member is stopped. A deceleration amount per unit time of the developing rotary member in the first period is smaller than a deceleration amount per unit time of the developing rotary member in the second period.Type: GrantFiled: October 11, 2017Date of Patent: April 30, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Koji Shigehiro, Ryohei Terada
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Publication number: 20180284643Abstract: A developing device includes an accommodating casing, a rotatable developer carrying member, a regulating portion, a magnetic flux generating portion including a first magnetic pole and a second magnetic pole which have the same polarity, and a cover portion provided downstream of the developing region and upstream of a maximum magnetic flux density position of the second magnetic pole with respect to a rotational direction of the developer carrying member. The cover portion is disposed between the casing and the developer carrying member. A first opposing region between an inner surface of the casing and the developer carrying member is in a side downstream of the developing region and upstream of a second opposing region between the cover portion and the developer carrying member with respect to the rotational direction.Type: ApplicationFiled: March 20, 2018Publication date: October 4, 2018Inventors: Masafumi Takahashi, Ryohei Terada, Yushi Sadamitsu, Yasuhiro Shimoi, Yutaka Koga, Yukihiro Soeta
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Publication number: 20180284641Abstract: A developing device includes a developer accommodating casing, a developer carrying member, a regulating portion, a magnetic flux generating portion, and a cover portion. A first opposing region between the casing and the developer carrying member is downstream of the developing region and upstream of a second opposing region between the cover portion and the developer carrying member with respect to a rotational direction. The following relationships are satisfied: L1?L2+L3, and L2?L3, where L1 is a minimum distance between the developer carrying member and the accommodating casing in the first opposing region, L2 is a minimum distance between the developer carrying member and the cover portion in the second opposing region, and L3 is a minimum distance between the cover portion and the accommodating portion opposing the cover portion.Type: ApplicationFiled: March 20, 2018Publication date: October 4, 2018Inventors: Yukihiro Soeta, Masafumi Takahashi, Ryohei Terada, Yushi Sadamitsu, Yasuhiro Shimoi, Yutaka Koga
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Publication number: 20180284656Abstract: A developing device includes an accommodating casing, a rotatable developer carrying member, a regulating portion, a magnetic flux generating portion including a first magnetic pole and a second magnetic pole which have the same polarity, and a cover portion provided downstream of the developing region and upstream of a maximum magnetic flux density position of the second magnetic pole with respect to a rotational direction of the developer carrying member. The cover portion is disposed between the casing and the developer carrying member. A downstream end of the cover portion with respect to the rotational direction is in a side upstream, with respect to the rotational direction, of a minimum magnetic flux density position between the first magnetic pole and the second magnetic pole with respect to the rotational direction.Type: ApplicationFiled: March 20, 2018Publication date: October 4, 2018Inventors: Masafumi Takahashi, Ryohei Terada, Yushi Sadamitsu, Yasuhiro Shimoi, Yutaka Koga, Yukihiro Soeta
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Patent number: 10088772Abstract: A developing device includes a rotatable developer carrying member enclosing a magnetic field generating portion including a plurality of magnetic poles and configured to carry a developer; and a resinous regulating portion provided at a position opposing the developer carrying member and configured to regulate an amount of the developer carried by the developer carrying member. The regulating portion is formed of a resin material containing magnetic powder, and at least a free end portion, opposed to the developer carrying member, of the regulating portion has relative permeability of 10 or more and 60 or less.Type: GrantFiled: January 17, 2018Date of Patent: October 2, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Ryohei Terada, Ichiro Katsuie, Shoji Naruge, Masahiro Ootsuka, Tatsuya Inoue
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Publication number: 20180267433Abstract: A development device includes a power source capable of applying a second voltage higher than a first voltage to be applied to a developer bearing member, a scattering prevention electrode that is arranged opposite the developer bearing member and to which the second voltage is applied from the power source, and a step-down circuit. The step-down circuit steps down a voltage from the power source from the second voltage to the first voltage to apply the stepped-down voltage to the developer bearing member.Type: ApplicationFiled: March 6, 2018Publication date: September 20, 2018Inventor: Ryohei Terada
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Publication number: 20180210369Abstract: A developing device includes a rotatable developer carrying member enclosing a magnetic field generating portion including a plurality of magnetic poles and configured to carry a developer; and a resinous regulating portion provided at a position opposing the developer carrying member and configured to regulate an amount of the developer carried by the developer carrying member. The regulating portion is formed of a resin material containing magnetic powder, and at least a free end portion, opposed to the developer carrying member, of the regulating portion has relative permeability of 10 or more and 60 or less.Type: ApplicationFiled: January 17, 2018Publication date: July 26, 2018Inventors: Ryohei Terada, Ichiro Katsuie, Shoji Naruge, Masahiro Ootsuka, Tatsuya Inoue
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Publication number: 20180107143Abstract: Provided is an image forming apparatus, including: a developer containing unit configured to contain developer; a developer bearing member, which is rotatably provided in the developer containing unit, and is configured to bear the developer; a driving unit configured to drive the developer bearing member; and a control unit configured to control the driving unit so that, when rotation of the developer bearing member is stopped after an image forming operation is terminated, drive transmission to the developer bearing member is turned off after a rotational speed of the developer bearing member is reduced to a set rotational speed lower than a rotational speed of the developer bearing member during the image formation while performing the drive transmission to the developer bearing member.Type: ApplicationFiled: October 11, 2017Publication date: April 19, 2018Inventors: Koji Shigehiro, Ryohei Terada
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Patent number: 9897960Abstract: An image forming apparatus including a toner container, a toner amount detection unit, a driving unit, a toner accommodating unit, a remaining toner amount detection unit, and a control unit is provided. The toner container supplies the toner to the toner accommodating unit by being rotated in a first direction. The toner amount detection unit detects a value related to an amount of the toner in the toner container. The control unit controls the driving unit so as to rotate the toner container in a second direction in a case where the remaining-toner amount detection unit has detected that the amount of the toner accommodated by the toner accommodating unit is smaller than a first set amount and the amount of the toner contained in the toner container detected by the toner amount detection unit reaches a second set amount.Type: GrantFiled: November 2, 2016Date of Patent: February 20, 2018Assignee: Canon Kabushiki KaishaInventors: Masahiro Ootsuka, Ichiro Katsuie, Shoji Naruge, Ryohei Terada
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Publication number: 20170139365Abstract: An image forming apparatus including a toner container, a toner amount detection unit, a driving unit, a toner accommodating unit, a remaining toner amount detection unit, and a control unit is provided. The toner container supplies the toner to the toner accommodating unit by being rotated in a first direction. The toner amount detection unit detects a value related to an amount of the toner in the toner container. The control unit controls the driving unit so as to rotate the toner container in a second direction in a case where the remaining-toner amount detection unit has detected that the amount of the toner accommodated by the toner accommodating unit is smaller than a first set amount and the amount of the toner contained in the toner container detected by the toner amount detection unit reaches a second set amount.Type: ApplicationFiled: November 2, 2016Publication date: May 18, 2017Inventors: Masahiro Ootsuka, Ichiro Katsuie, Shoji Naruge, Ryohei Terada
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Patent number: 9268263Abstract: A development device wherein a magnetic force distribution of a developer bearing member in a longitudinal direction at positions at which a magnetic flux density of a low magnetic field area is minimal in the peripheral direction of the developer bearing member is set such that a difference between a maximum magnetic flux density in a range from a maximum position at which an attenuation rate of the magnetic flux density is maximal to a 30 mm distant position toward the center of the developer bearing member and a magnetic flux density on a further center side of the developer bearing member than the range is 3 mT or less, and an absolute value of the magnetic flux density of a further outer side in the longitudinal direction of the developer bearing member than the maximum position is set to 3 mT or less.Type: GrantFiled: May 1, 2015Date of Patent: February 23, 2016Assignee: Canon Kabushiki KaishaInventors: Osamu Ariizumi, Takanori Iida, Shinya Suzuki, Ryohei Terada, Ichiro Katsuie, Shoji Naruge, Masahiro Ootsuka
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Publication number: 20150331365Abstract: A development device wherein a magnetic force distribution of a developer bearing member in a longitudinal direction at positions at which a magnetic flux density of a low magnetic field area is minimal in the peripheral direction of the developer bearing member is set such that a difference between a maximum magnetic flux density in a range from a maximum position at which an attenuation rate of the magnetic flux density is maximal to a 30 mm distant position toward the center of the developer bearing member and a magnetic flux density on a further center side of the developer bearing member than the range is 3 mT or less, and an absolute value of the magnetic flux density of a further outer side in the longitudinal direction of the developer bearing member than the maximum position is set to 3 mT or less.Type: ApplicationFiled: May 1, 2015Publication date: November 19, 2015Inventors: Osamu Ariizumi, Takanori Iida, Shinya Suzuki, Ryohei Terada, Ichiro Katsuie, Shoji Naruge, Masahiro Ootsuka
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Patent number: 5070431Abstract: A display board illuminating device includes a light guide plate arranged to face the back of a display board and a light source disposed to face the side end of the light guide plate. The side end of the light guide plate is inclined toward the center of the light guide plate in the direction of the display board. By this configuration an angle of an optical axis refracted at the surface of the side end and incident into the light guide plate with respect to a main surface of the light guide plate, so that the whole area of the display board is illuminated efficiently.Type: GrantFiled: July 30, 1990Date of Patent: December 3, 1991Assignee: Pioneer Electronic CorporationInventors: Hideki Kitazawa, Ryohei Terada, Shogo Takeuchi, Tsutomu Kayama, Kohichi Tanimoto, Nobuo Utsugi, Yoshiaki Nagai