Patents by Inventor Yuichi Matsushita
Yuichi Matsushita 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: 8107850Abstract: A developing device is provided. The developing device includes a housing, a developing agent carrier, and a developing agent leakage prevention member. The developing agent leakage prevention member has a first layer that is configured to contact an outer circumferential surface of a longitudinal end of the developing agent carrier; a second layer that is superimposed on the first layer and is configured to contact a portion of the housing; and an adhesive layer that is interposed between the first layer and the second layer, the adhesive layer partially bonding a first opposing surface of the first layer opposing the second layer to a second opposing surface of the second layer opposing the first layer such that an unbonded area where the first opposing surface and the second opposing surface are not bonded together is produced.Type: GrantFiled: January 29, 2009Date of Patent: January 31, 2012Assignee: Brother Kogyo Kabushiki KaishaInventors: Fan Xu, Yuichi Matsushita, Yoshinori Ito
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Patent number: 8041250Abstract: A developing device according to an aspect of the invention includes: a housing; a developing roller comprising a roller main body having a circumferential surface, the developing roller being rotatably supported to the housing; and seal members respectively disposed to face both end portions of the circumferential surface of the roller main body with respect to a rotational axis direction thereof and to press contact with the roller main body. Each of the seal members comprises: a base material formed of an elastic element; and a sliding frictional member that is formed of fibers and contacts with the circumferential surface of the roller main body such that the roller main body frictionally slides on the sliding frictional member. Both edges of the circumferential surface of the roller main body with respect to the rotational axis direction thereof are brought into contact with the base materials.Type: GrantFiled: September 4, 2008Date of Patent: October 18, 2011Assignee: Brother Kogyo Kabushiki KaishaInventor: Yuichi Matsushita
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Patent number: 8027613Abstract: An arrangement of sealing members seals developer in a developer device. The sealing members minimize or eliminate developer from leaking around the sides of a developer carrier.Type: GrantFiled: September 27, 2006Date of Patent: September 27, 2011Assignee: Brother Kogyo Kabushiki KaishaInventors: Yuichi Matsushita, Mitsuru Horinoe, Yukiko Nakaya, Hiroki Mori
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Patent number: 7925180Abstract: An image forming apparatus includes a main body, image formation units disposed in the main body, a moving member disposed in the main body, the moving member including a surface facing each image formation unit, a pair of first stoppers disposed in each image formation unit, and a pair of second stoppers disposed in the main body in correspondence with each image formation unit, each second stopper being configured to prevent the developer on the moving member from entering the image formation unit.Type: GrantFiled: September 27, 2006Date of Patent: April 12, 2011Assignee: Brother Kogyo Kabushiki KaishaInventors: Hiroki Mori, Mitsuru Horinoe, Yukiko Nakaya, Yuichi Matsushita
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Patent number: 7899356Abstract: A layer-thickness regulating member includes a thin plate member and a projection member provided on a free edge portion of the thin plate member. A leak preventing members include a first seal member and a second seal member. The first seal member includes a first downstream portion disposed adjacent to the projection member on a front surface of the thin plate member, and a first upstream portion extending upstream of the first downstream portion. The second seal member includes a second downstream portion, and a second upstream portion which extends upstream of the second downstream portion. The second upstream portion includes a covered portion covered with the first upstream portion, an opposed portion disposed adjacent to the covered portion and opposed to the adjacent portion of the projection member and an exposed portion extending upstream of the covered portion and the opposed portion.Type: GrantFiled: August 29, 2007Date of Patent: March 1, 2011Assignee: Brother Kogyo Kabushiki KaishaInventors: Hiroki Mori, Mitsuru Horinoe, Yuichi Matsushita, Yukiko Nakaya, Fan Xu
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Patent number: 7764901Abstract: A layer-thickness regulating member may include a thin plate member and a projection member. The projection member includes a first pressure contact portion that comes into pressure-contact with each of seal areas, a second pressure contact portion that comes into pressure-contact with each of side end areas, and a third pressure contact portion that comes into pressure-contact with a central area. A notched portion is formed at a position of the distal end of the thin plate member where each of the second pressure contact portions is formed, by cutting the thin plate member from an end edge of the distal end toward a downstream side of the rotation direction of the developing agent carrier.Type: GrantFiled: April 17, 2007Date of Patent: July 27, 2010Assignee: Brother Kogyo Kabushiki KaishaInventors: Hiroki Mori, Mitsuru Horinoe, Yukiko Nakaya, Yuichi Matsushita, Fan Xu
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Patent number: 7751743Abstract: A developer cartridge includes a developer roller, a support member and a first seal member. The developer roller has a rotational axis and a peripheral surface. The peripheral surface includes a center zone and an end zone at one end portion in an axial direction. The support member supports the developer roller to be rotatable about the rotational axis. The support member has an opposing surface opposed to the end zone. A protrusion protrudes from the opposing surface, and extends in a direction crossing with the axial direction. The first seal member is disposed between the end zone and the opposing surface in order to prevent developer from leaking out of a space formed between the end zone and the opposing surface.Type: GrantFiled: April 26, 2006Date of Patent: July 6, 2010Assignee: Brother Kogyo Kabushiki KaishaInventors: Naoya Kamimura, Yuichi Matsushita
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Patent number: 7706715Abstract: A developer cartridge includes a developer cartridge case for accommodating a developer, a developing roller, a toner layer thickness control blade, and a side sealing member. The developing roller is supported by the developer cartridge case such that a circumferential surface thereof is exposed to an outside of the developer cartridge case along a width direction. The toner layer thickness control blade includes a blade body portion made of a metallic plate. A tip portion of the blade body portion is disposed at a sliding portion of the developing roller and the side sealing member so as to contact with the side sealing member. A frictional heat generated at the sliding portion is released to the outside of the developer cartridge case through the blade body portion in order restrain a leak of the developer as much as possible.Type: GrantFiled: March 22, 2007Date of Patent: April 27, 2010Assignee: Brother Kogyo Kabushiki KaishaInventors: Hiroki Mori, Mitsuru Horinoe, Yukiko Nakaya, Yuichi Matsushita, Fan Xu
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Publication number: 20100092206Abstract: A developing device includes a developer carrier which carries a developer, a developing unit housing which rotatably supports the developer carrier, a side seal member which comes into slidable contact with both ends of the developer carrier, a sheet-like elongated seal member which extends in the axial direction of the developer carrier so as to come into slidable contact with the developer carrier, a side seal attachment surface which is formed in the developing unit housing and to which the side seal member is attached, and a support portion which is formed in the developing unit housing and protrudes toward the developer carrier from the side seal attachment surface to support the elongated seal member. The elongated seal member is attached onto the support portion in a state where both ends thereof overlap the side seal member and are opposite the side seal attachment surface.Type: ApplicationFiled: October 9, 2009Publication date: April 15, 2010Applicant: BROTHER KOGYO KABUSHIKI KAISHAInventors: Yuichi Matsushita, Fan Xu, Mitsuru Horinoe, Takashi Yasuda
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Patent number: 7680430Abstract: A developing agent leakage preventing member is provided that is attached to the developer housing and that has a housing attaching face which contacts with the developer housing, a front side face which opposes the housing attaching face, and two side faces each of which connects to each other end portions of the housing attaching face and the front side face in the longitudinal direction of the opening of the developer housing. At least one of the side faces of the developing agent leakage preventing member is formed as an inclined side face that is inclined in a predetermined direction relative to the housing attaching face when pressed from the front side face side. In a developing apparatus, developing agent (toner) leakage is avoided.Type: GrantFiled: August 24, 2006Date of Patent: March 16, 2010Assignee: Brother Kogyo Kabushiki KaishaInventors: Hiroki Mori, Masahiro Ishii, Mitsuru Horinoe, Yukiko Nakaya, Yuichi Matsushita
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Developing device having a side seal member located between a developing roller and a case main body
Patent number: 7630666Abstract: A developing device is provided with a case main body, a developing roller capable of rotating and supporting developer housed in the case main body, an adjustment member extending along a rotation axis direction of the developing roller, and a side seal member. The side seal member comprises a first seal member mounted on the case main body, and a second seal member mounted on the adjustment member. The first seal member and the second seal member are configured separately and make contact with one another.Type: GrantFiled: September 27, 2006Date of Patent: December 8, 2009Assignee: Brother Kogyo Kabushiki KaishaInventors: Yukiko Nakaya, Mitsuru Horinoe, Hiroki Mori, Yuichi Matsushita -
Patent number: 7627264Abstract: A developing device is provided that includes a developer containing case that contains a developer. The developer containing case includes a case main body and a supply roller that is rotatably supported on the case main body. The supply roller has a rotary shaft, a cylindrical roller main body that covers the rotary shaft, and a fixed member that is fixed to at least one of the rotary shaft and the roller main body. A gap is provided between an end surface of the roller main body and an inner surface of the case main body, and the fixed member partially occupies the gap.Type: GrantFiled: September 28, 2006Date of Patent: December 1, 2009Assignee: Brother Kogyo Kabushiki KaishaInventors: Yuichi Matsushita, Hiroki Mori, Yukiko Nakaya, Fan Xu, Isao Kishi, Masahiro Ishii, Mitsuru Horinoe
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Patent number: 7623815Abstract: There is provided a developing device including: a casing; a developing roller held by the casing and carrying a developing agent; and a layer-thickness regulating blade for regulating a layer thickness of the developing agent carried on the developing roller, in which in the state where the developing roller is held by the casing, the tip end portion of the layer-thickness regulating blade abuts against the developing roller at a uniform pressure in the axial direction of the developing roller, and in the state where the developing roller is not held by the casing, the layer-thickness regulating blade is bent toward a disposed position of the developing roller.Type: GrantFiled: August 22, 2007Date of Patent: November 24, 2009Assignee: Brother Kogyo Kabushiki KaishaInventors: Hiroki Mori, Yuichi Matsushita, Yukiko Nakaya, Fan Xu, Mitsuru Horinoe
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Publication number: 20090226207Abstract: A developing device according to an aspect of the invention includes: a housing; a developing roller comprising a roller main body having a circumferential surface, the developing roller being rotatably supported to the housing; and seal members respectively disposed to face both end portions of the circumferential surface of the roller main body with respect to a rotational axis direction thereof and to press contact with the roller main body. Each of the seal members comprises: a base material formed of an elastic element; and a sliding frictional member that is formed of fibers and contacts with the circumferential surface of the roller main body such that the roller main body frictionally slides on the sliding frictional member. Both edges of the circumferential surface of the roller main body with respect to the rotational axis direction thereof are brought into contact with the base materials.Type: ApplicationFiled: September 4, 2008Publication date: September 10, 2009Applicant: Brother Kogyo Kabushiki KaishaInventor: Yuichi MATSUSHITA
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Publication number: 20090190952Abstract: A developing device is provided. The developing device includes a housing, a developing agent carrier, and a developing agent leakage prevention member. The developing agent leakage prevention member has a first layer that is configured to contact an outer circumferential surface of a longitudinal end of the developing agent carrier; a second layer that is superimposed on the first layer and is configured to contact a portion of the housing; and an adhesive layer that is interposed between the first layer and the second layer, the adhesive layer partially bonding a first opposing surface of the first layer opposing the second layer to a second opposing surface of the second layer opposing the first layer such that an unbonded area where the first opposing surface and the second opposing surface are not bonded together is produced.Type: ApplicationFiled: January 29, 2009Publication date: July 30, 2009Applicant: BROTHER KOGYO KABUSHIKI KAISHAInventors: Fan XU, Yuichi MATSUSHITA, Yoshinori ITO
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Patent number: 7457560Abstract: A developing device is provided with a case main body, a developing roller coupled with the case main body, an axis direction seal member coupled with the case main body, and a side seal member coupled with the case main body. The axis direction seal member and the side seal member make contact with one another such that there is no gap between the axis direction seal member and the side seal member in a rotation axis direction of the developing roller. In a rotation direction of the developing roller, an upstream end of the side seal member is located downstream of an upstream end of a contact area between the axis direction seal member and the developing roller.Type: GrantFiled: September 28, 2006Date of Patent: November 25, 2008Assignee: Brother Kogyo Kabushiki KaishaInventors: Yukiko Nakaya, Mitsuru Horinoe, Hiroki Mori, Yuichi Matsushita
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Patent number: 7423486Abstract: A differential amplifier formed on a silicon-on-insulator substrate, including means to prevent the bodies of its differential input transistors from charging to unwanted potentials in the standby state. In one aspect of the invention, the means takes the form of switching transistors inserted between the differential input transistors and their loads. In another aspect of the invention, the means takes the form of switching transistors inserted between the sources and bodies of the differential input transistors. In another aspect of the invention the means is a regulator section that holds the bodies of the differential input transistors at an appropriate potential level.Type: GrantFiled: October 23, 2007Date of Patent: September 9, 2008Assignee: Oki Electric Industry Co., Ltd.Inventor: Yuichi Matsushita
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Publication number: 20080056774Abstract: A layer-thickness regulating member includes a thin plate member and a projection member provided on a free edge portion of the thin plate member. A leak preventing members include a first seal member and a second seal member. The first seal member includes a first downstream portion disposed adjacent to the projection member on a front surface of the thin plate member, and a first upstream portion extending upstream of the first downstream portion. The second seal member includes a second downstream portion, and a second upstream portion which extends upstream of the second downstream portion. The second upstream portion includes a covered portion covered with the first upstream portion, an opposed portion disposed adjacent to the covered portion and opposed to the adjacent portion of the projection member and an exposed portion extending upstream of the covered portion and the opposed portion.Type: ApplicationFiled: August 29, 2007Publication date: March 6, 2008Applicant: BROTHER KOGYO KABUSHIKI KAISHAInventors: Hiroki MORI, Mitsuru HORINOE, Yuichi MATSUSHITA, Yukiko NAKAYA, Fan XU
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Publication number: 20080050153Abstract: There is provided a developing device including: a casing; a developing roller held by the casing and carrying a developing agent; and a layer-thickness regulating blade for regulating a layer thickness of the developing agent carried on the developing roller, in which in the state where the developing roller is held by the casing, the tip end portion of the layer-thickness regulating blade abuts against the developing roller at a uniform pressure in the axial direction of the developing roller, and in the state where the developing roller is not held by the casing, the layer-thickness regulating blade is bent toward a disposed position of the developing roller.Type: ApplicationFiled: August 22, 2007Publication date: February 28, 2008Applicant: BROTHER KOGYO KABUSHIKI KAISHAInventors: Hiroki MORI, Yuichi MATSUSHITA, Yukiko NAKAYA, Fan XU, Mitsuru HORINOE
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Publication number: 20080042749Abstract: A differential amplifier formed on a silicon-on-insulator substrate, including means to prevent the bodies of its differential input transistors from charging to unwanted potentials in the standby state. In one aspect of the invention, the means takes the form of switching transistors inserted between the differential input transistors and their loads. In another aspect of the invention, the means takes the form of switching transistors inserted between the sources and bodies of the differential input transistors. In another aspect of the invention the means is a regulator section that holds the bodies of the differential input transistors at an appropriate potential level.Type: ApplicationFiled: October 23, 2007Publication date: February 21, 2008Applicant: OKI ELECTRIC INDUSTRY CO., LTD.Inventor: Yuichi Matsushita