Patents by Inventor Masanobu Nakajima
Masanobu Nakajima 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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Publication number: 20190094743Abstract: A charging apparatus including: a first charging roller configured to charge a surface of a photosensitive drum by rotating in contact with the surface of the photosensitive drum; a second charging roller configured to charge the surface of the photosensitive drum by rotating in contact with the surface of the photosensitive drum at a position downstream of the first charging roller in a rotation direction of the photosensitive drum; and a cleaning roller configured to clean a surface of the first charging roller and a surface of the second charging roller by rotating along with rotation of the first and second charging rollers in contact with the surfaces of the first and second charging rollers, an inroad amount of the first charging roller into the cleaning roller being larger than an inroad amount of the second charging roller into the cleaning roller.Type: ApplicationFiled: September 14, 2018Publication date: March 28, 2019Inventor: Masanobu Nakajima
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Patent number: 9541887Abstract: A cleaning blade includes an image region and a non-image region in which Young's moduli at positions separated by a distance of L ?m from an edge portion in contact with an photosensitive drum are respectively defined as YL and Y?L, Y0 and Y?0 are 10 mgf/?m2 or more and 400 mgf/?m2 or less, Y50/Y0 is 0.5 or less, [{(Y0?Y20)/Y0}/(20?0)] is equal to or more than [{(Y20?Y50)/Y0}/(50?20)] and, the Young's modulus Y50 ?the Young's modulus Y?L where L satisfies 0?L ?100 ?m.Type: GrantFiled: October 23, 2015Date of Patent: January 10, 2017Assignee: Canon Kabushiki KaishaInventors: Masanobu Nakajima, Norihiko Kubo, Hisataka Hisakuni, Masaya Kawada, Kenji Karashima
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Publication number: 20160124375Abstract: A cleaning blade includes an image region and a non-image region in which Young's moduli at positions separated by a distance of L ?m from an edge portion in contact with an photosensitive drum are respectively defined as YL and Y?L, Y0 and Y?0 are 10 mgf/?m2 or more and 400 mgf/?m2 or less, Y50/Y0 is 0.5 or less, [{(Y0?Y20)/Y0}/(20?0)] is equal to or more than [{(Y20?Y50)/Y0}/(50?20)] and, the Young's modulus Y50 the Young's modulus Y?L where L satisfies 0?L?100 ?m.Type: ApplicationFiled: October 23, 2015Publication date: May 5, 2016Inventors: Masanobu Nakajima, Norihiko Kubo, Hisataka Hisakuni, Masaya Kawada, Kenji Karashima
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Patent number: 8417143Abstract: An image forming apparatus includes a rotatable photosensitive member; a corona charger provided with an opening opposed to a surface of the photosensitive member; image forming means for forming a toner image on the photosensitive member; a shutter for opening and closing the opening relative to the photosensitive member; sliding means for sliding in contact with the photosensitive member; measuring means for measuring time elapsed from end of image formation; and control means for controlling the apparatus on the basis of an output of the measuring means such that shutter is closed and the photosensitive member is rotated in contact with the sliding means.Type: GrantFiled: November 17, 2009Date of Patent: April 9, 2013Assignee: Canon Kabushiki KaishaInventor: Masanobu Nakajima
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Patent number: 8244147Abstract: An image forming apparatus is constituted by an image bearing member; a corona charging member including a wire; a heat generating member for generating heat by energization; a shielding member, including the heat generating member, capable of shielding a portion of the corona charging member opposing to the image bearing member from the image bearing member by being moved between the corona charging member and the image bearing member; an energization control member for controlling energization of the heat generating member; and moving member for moving the shielding member to a first position at which the shielding member shields the portion and a second position retracted from the first position. When the shielding member is located at the first position, at least a part of the heat generating member is disposed between the corona charging member and the image bearing member.Type: GrantFiled: July 29, 2011Date of Patent: August 14, 2012Assignee: Canon Kabushiki KaishaInventors: Masanobu Nakajima, Takahiro Nakase, Naoyuki Yamamoto
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Publication number: 20110286767Abstract: An image forming apparatus is constituted by an image bearing member; a corona charging member including a wire; a heat generating member for generating heat by energization; a shielding member, including the heat generating member, capable of shielding a portion of the corona charging member opposing to the image bearing member from the image bearing member by being moved between the corona charging member and the image bearing member; an energization control member for controlling energization of the heat generating member; and moving member for moving the shielding member to a first position at which the shielding member shields the portion and a second position retracted from the first position. When the shielding member is located at the first position, at least a part of the heat generating member is disposed between the corona charging member and the image bearing member.Type: ApplicationFiled: July 29, 2011Publication date: November 24, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Masanobu NAKAJIMA, Takahiro NAKASE, Naoyuki YAMAMOTO
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Patent number: 8036565Abstract: An image forming apparatus is constituted by an image bearing member; a corona charging member including a wire; a heat generating member for generating heat by energization; a shielding member, including the heat generating member, capable of shielding a portion of the corona charging member opposing to the image bearing member from the image bearing member by being moved between the corona charging member and the image bearing member; an energization control member for controlling energization of the heat generating member; and moving member for moving the shielding member to a first position at which the shielding member shields the portion and a second position retracted from the first position. When the shielding member is located at the first position, at least a part of the heat generating member is disposed between the corona charging member and the image bearing member.Type: GrantFiled: December 15, 2008Date of Patent: October 11, 2011Assignee: Canon Kabushiki KaishaInventors: Masanobu Nakajima, Takahiro Nakase, Naoyuki Yamamoto
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Patent number: 7773898Abstract: This invention provides an image forming apparatus capable of outputting, without using any special device, an image which is free from changes in density and tint even upon crisscross rotation and exhibits good proportion of a small character. To accomplish this, the pulse width of a laser emission signal is controlled at 16 levels for one dot at 600 dpi, controlling an actual image in the main scanning direction. When adjusting vertical and horizontal line widths, patch data are created by rotating an anisotropic pattern through 0° and 90° (S1 in FIG. 5). Then, a reader/scanner (15) reads each patch as density data (S2 in FIG. 5). A pulse width, that is, line width correction value at which the densities of the patch patterns rotated through 0° and 90° become equal to each other is obtained (S3 in FIG. 5).Type: GrantFiled: December 5, 2007Date of Patent: August 10, 2010Assignee: Canon Kabushiki KaishaInventors: Takahiro Nakase, Naoyuki Yamamoto, Masanobu Nakajima
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Publication number: 20100135682Abstract: An image forming apparatus includes a rotatable photosensitive member; a corona charger provided with an opening opposed to a surface of the photosensitive member; image forming means for forming a toner image on the photosensitive member; a shutter for opening and closing the opening relative to the photosensitive member; sliding means for sliding in contact with the photosensitive member; measuring means for measuring time elapsed from end of image formation; and control means for controlling the apparatus on the basis of an output of the measuring means such that shutter is closed and the photosensitive member is rotated in contact with the sliding means.Type: ApplicationFiled: November 17, 2009Publication date: June 3, 2010Applicant: CANON KABUSHIKI KAISHAInventor: Masanobu Nakajima
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Patent number: 7599642Abstract: An image forming apparatus is constituted by an image bearing member; a corona charging member including a wire; a heat generating member for generating heat by energization; a shielding member, including the heat generating member, capable of shielding a portion of the corona charging member opposing to the image bearing member from the image bearing member by being moved between the corona charging member and the image bearing member; an energization control member for controlling energization of the heat generating member; and moving member for moving the shielding member to a first position at which the shielding member shields the portion and a second position retracted from the first position. When the shielding member is located at the first position, at least a part of the heat generating member is disposed between the corona charging member and the image bearing member.Type: GrantFiled: August 10, 2007Date of Patent: October 6, 2009Assignee: Canon Kabushiki KaishaInventors: Masanobu Nakajima, Takahiro Nakase, Naoyuki Yamamoto
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Publication number: 20090136253Abstract: An image forming apparatus is constituted by an image bearing member; a corona charging member including a wire; a heat generating member for generating heat by energization; a shielding member, including the heat generating member, capable of shielding a portion of the corona charging member opposing to the image bearing member from the image bearing member by being moved between the corona charging member and the image bearing member; an energization control member for controlling energization of the heat generating member; and moving member for moving the shielding member to a first position at which the shielding member shields the portion and a second position retracted from the first position. When the shielding member is located at the first position, at least a part of the heat generating member is disposed between the corona charging member and the image bearing member.Type: ApplicationFiled: December 15, 2008Publication date: May 28, 2009Applicant: Canon Kabushiki KaishaInventors: Masanobu NAKAJIMA, Takahiro NAKASE, Naoyuki YAMAMOTO
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Publication number: 20080130061Abstract: This invention provides an image forming apparatus capable of outputting, without using any special device, an image which is free from changes in density and tint even upon crisscross rotation and exhibits good proportion of a small character. To accomplish this, the pulse width of a laser emission signal is controlled at 16 levels for one dot at 600 dpi, controlling an actual image in the main scanning direction. When adjusting vertical and horizontal line widths, patch data are created by rotating an anisotropic pattern through 0° and 90° (S1 in FIG. 5). Then, a reader/scanner (15) reads each patch as density data (S2 in FIG. 5). A pulse width, that is, line width correction value at which the densities of the patch patterns rotated through 0° and 90° become equal to each other is obtained (S3 in FIG. 5).Type: ApplicationFiled: December 5, 2007Publication date: June 5, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Takahiro Nakase, Naoyuki Yamamoto, Masanobu Nakajima
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Publication number: 20080038011Abstract: An image forming apparatus is constituted by an image bearing member; a corona charging member including a wire; a heat generating member for generating heat by energization; a shielding member, including the heat generating member, capable of shielding a portion of the corona charging member opposing to the image bearing member from the image bearing member by being moved between the corona charging member and the image bearing member; an energization control member for controlling energization of the heat generating member; and moving member for moving the shielding member to a first position at which the shielding member shields the portion and a second position retracted from the first position. When the shielding member is located at the first position, at least a part of the heat generating member is disposed between the corona charging member and the image bearing member.Type: ApplicationFiled: August 10, 2007Publication date: February 14, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Masanobu Nakajima, Takahiro Nakase, Naoyuki Yamamoto
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Patent number: 4166369Abstract: A safety device for press brakes comprises light projectors mounted on the side of a lower beam of the press brake so as to form a plurality of horizontal light beams extending between a punch and a workpiece, light receivers mounted on the side of the lower beam so as to receive said light beams, and detector means mounted between said light receivers and a safety circuit and adapted to be actuated immediately before the interruption of the light beams when the punch interrupts them with the downward movement of a slide, thereby preventing the stopping of the operation of the press brake.Type: GrantFiled: April 6, 1978Date of Patent: September 4, 1979Assignee: Kabushiki Kaisha Komatsu SeisakushoInventor: Masanobu Nakajima