Patents by Inventor Sadao Okano
Sadao Okano 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: 10095148Abstract: A charging device includes a first cleaning member that cleans a surface of a charging wire by moving along the wire while being in contact with the wire at a first side; and a second cleaning member that cleans the surface of the wire by moving while being in contact with the wire at a second side, and moving relative to the first cleaning member in a crossing direction that crosses a wire length direction.Type: GrantFiled: August 1, 2017Date of Patent: October 9, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Yusuke Kitagawa, Sadao Okano, Yasuo Takayama, Akiko Kimura
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Publication number: 20180095377Abstract: A charging device includes a first cleaning member that cleans a surface of a charging wire by moving along the wire while being in contact with the wire at a first side; and a second cleaning member that cleans the surface of the wire by moving while being in contact with the wire at a second side, and moving relative to the first cleaning member in a crossing direction that crosses a wire length direction.Type: ApplicationFiled: August 1, 2017Publication date: April 5, 2018Applicant: FUJI XEROX CO., LTD.Inventors: Yusuke KITAGAWA, Sadao OKANO, Yasuo TAKAYAMA, Akiko KIMURA
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Patent number: 9851653Abstract: A charging device includes an electrode, a cleaning member that moves along the electrode and cleans the electrode, a rotating member that is disposed along the electrode, includes a spiral protruding portion on an outer circumferential surface thereof, and circumferentially rotates, and a movable member to which the cleaning member is attached. The movable member includes a first through hole through which the rotating member passes, a first pressed portion that is provided on an inner circumferential surface of the first through hole and pressed by the protruding portion of the rotating member, and a second pressed portion that is disposed at a different position from a position of the first pressed portion in an axial direction of the rotating member and that is disposed such that one or more turns of the protruding portion are positioned between the second pressed portion and the first pressed portion.Type: GrantFiled: August 22, 2016Date of Patent: December 26, 2017Assignee: FUJI XEROX CO., LTD.Inventors: Yusuke Kitagawa, Akiko Kimura, Yasuo Takayama, Sadao Okano
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Patent number: 9817329Abstract: A charging device includes a first cleaning member, a first electrode, a second cleaning member, a second electrode, and a movable body. The first cleaning member moves in one direction. The first electrode is cleaned by the first cleaning member moving in the one direction. The second cleaning member moves in the one direction together with the first cleaning member and moves so that a downstream end portion thereof, which is located downstream in the one direction, serves as a leading portion and an upstream end portion thereof comes after the downstream end portion. The second electrode includes a first region and a second region. The first region is cleaned by the second cleaning member moving in the one direction. The second region is located downstream in comparison with the first region in the one direction.Type: GrantFiled: August 22, 2016Date of Patent: November 14, 2017Assignee: FUJI XEROX CO., LTD.Inventors: Akiko Kimura, Sadao Okano, Yasuo Takayama, Yusuke Kitagawa
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Patent number: 9791800Abstract: A charging device includes: an electrode; a cleaning member that cleans the electrode; a moving body that moves along the electrode, the cleaning member that is attached to the moving body; and a rotation member that is disposed along the electrode and that includes a spiral protrusion on an outer circumferential surface thereof to move the moving body, the rotation member that is rotated in a circumferential direction. A plurality of kinds of pitch intervals of the protrusion are provided on at least a central portion of the rotation member in a longitudinal direction.Type: GrantFiled: August 19, 2016Date of Patent: October 17, 2017Assignee: FUJI XEROX CO., LTD.Inventors: Yasuo Takayama, Sadao Okano, Akiko Kimura, Yusuke Kitagawa
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Publication number: 20170205729Abstract: A charging device includes: an electrode; a cleaning member that cleans the electrode; a moving body that moves along the electrode, the cleaning member that is attached to the moving body; and a rotation member that is disposed along the electrode and that includes a spiral protrusion on an outer circumferential surface thereof to move the moving body, the rotation member that is rotated in a circumferential direction. A plurality of kinds of pitch intervals of the protrusion are provided on at least a central portion of the rotation member in a longitudinal direction.Type: ApplicationFiled: August 19, 2016Publication date: July 20, 2017Applicant: FUJI XEROX CO., LTD.Inventors: Yasuo TAKAYAMA, Sadao OKANO, Akiko KIMURA, Yusuke KITAGAWA
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Publication number: 20170205725Abstract: A charging device includes a first cleaning member, a first electrode, a second cleaning member, a second electrode, and a movable body. The first cleaning member moves in one direction. The first electrode is cleaned by the first cleaning member moving in the one direction. The second cleaning member moves in the one direction together with the first cleaning member and moves so that a downstream end portion thereof, which is located downstream in the one direction, serves as a leading portion and an upstream end portion thereof comes after the downstream end portion. The second electrode includes a first region and a second region. The first region is cleaned by the second cleaning member moving in the one direction. The second region is located downstream in comparison with the first region in the one direction.Type: ApplicationFiled: August 22, 2016Publication date: July 20, 2017Applicant: FUJI XEROX CO., LTD.Inventors: Akiko KIMURA, Sadao OKANO, Yasuo TAKAYAMA, Yusuke KITAGAWA
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Publication number: 20170205726Abstract: A charging device includes an electrode, a cleaning member that moves along the electrode and cleans the electrode, a rotating member that is disposed along the electrode, includes a spiral protruding portion on an outer circumferential surface thereof, and circumferentially rotates, and a movable member to which the cleaning member is attached. The movable member includes a first through hole through which the rotating member passes, a first pressed portion that is provided on an inner circumferential surface of the first through hole and pressed by the protruding portion of the rotating member, and a second pressed portion that is disposed at a different position from a position of the first pressed portion in an axial direction of the rotating member and that is disposed such that one or more turns of the protruding portion are positioned between the second pressed portion and the first pressed portion.Type: ApplicationFiled: August 22, 2016Publication date: July 20, 2017Applicant: FUJI XEROX CO., LTD.Inventors: Yusuke KITAGAWA, Akiko KIMURA, Yasuo TAKAYAMA, Sadao OKANO
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Patent number: 6915100Abstract: In the image forming process of the present invention wherein a toner is fixed on an electrophotographic image-receiving sheet using a belt fixing and smoothing device, the relationship among the temperature of a heating and fixing roller, the melting point of a toner wax, and the glass transition point of a toner binder, the relationship among the temperature of a heating and fixing roller, the melting point of a wax in the image-receiving layer, and the glass transition point of a binder in the image-receiving layer, and the relationship between the polar components of surface free energy of the toner-image-receiving layer before and after image fixing are optimized. The present invention is to prevent offset in the toner and the toner-image-receiving layer of the electrophotographic image-receiving sheet upon releasing of the belt and to avoid deterioration in image quality especially in operation over the long run.Type: GrantFiled: October 24, 2003Date of Patent: July 5, 2005Assignees: Fuji Photo Film Co., Ltd., Fuji Xerox Co., Ltd.Inventors: Yoshio Tani, Kazuhito Miyake, Yasutomo Goto, Sadao Okano
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Patent number: 6871040Abstract: Provided is an image forming process which can effectively suppress the occurrence of separation electrification between a belt surface layer and an image-receiving layer of an electrophotographic image-receiving sheet at a cooling and separation unit, prevent dust from adsorbing to charges at each surface thereof, and print high quality images having near-photographic quality, in which a belt-fixing smoothing device having a heating and pressuring member, a belt member, a cooling device, and a cooling and separating unit is used to conduct fixing treatment to an electrophotographic image-receiving sheet. In this case, a surface resistivity (SR1) of one side of the image-receiving sheet on which an image is formed satisfies the formula 1.0×109 ?/cm2?SR1?1.0×1014 ?/cm2, and a surface resistivity (SR2) of one side of the belt member which becomes in contact with the image satisfies the formula SR2?1.0×1014 ?/cm2.Type: GrantFiled: October 7, 2003Date of Patent: March 22, 2005Assignees: Fuji Photo Film Co., Ltd., Fuji Xerox Co., Ltd.Inventors: Yoshio Tani, Masataka Murata, Sadao Okano
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Patent number: 6771926Abstract: In a fuser, a cooling structure (5) is disposed so that a bend angle (&agr;) of a part bent during the time between an endless belt (3) coming in contact with a press cooling face (5a) of the cooling structure (5) and exiting from the press cooling face (5a) is placed in the range of 0° C.<&agr;≦7° C. A fixing belt has a minute hardness of 0.1 to 5 at least on the belt surface coming in contact with toner T and preferably has a gloss degree of 75 or more on the belt surface.Type: GrantFiled: April 2, 2003Date of Patent: August 3, 2004Assignee: Fuji Xerox Co., Ltd.Inventors: Kiyotaka Ishikawa, Yoshio Kanesawa, Motoi Noya, Sadao Okano, Shinichi Utsumi, Hideaki Seikiguchi, Kazuhisa Masuko, Michiaki Yasuno, Fumio Daishi, Makoto Omata
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Publication number: 20040146325Abstract: Provided is an image forming process which can effectively suppress the occurrence of separation electrification between a belt surface layer and an image-receiving layer of an electrophotographic image-receiving sheet at a cooling and separation unit, prevent dust from adsorbing to charges at each surface thereof, and print high quality images having near-photographic quality, in which a belt-fixing smoothing device having a heating and pressuring member, a belt member, a cooling device, and a cooling and separating unit is used to conduct fixing treatment to an electrophotographic image-receiving sheet. In this case, a surface resistivity (SR1) of one side of the image-receiving sheet on which an image is formed satisfies the formula 1.0×109 &OHgr;/cm2≦SR1≦1.0×1014 &OHgr;/cm2, and a surface resistivity (SR2) of one side of the belt member which becomes in contact with the image satisfies the formula SR2≦1.0×1014 &OHgr;/cm2.Type: ApplicationFiled: October 7, 2003Publication date: July 29, 2004Applicants: FUJI PHOTO FILM CO., LTD., FUJI XEROX CO., LTD.Inventors: Yoshio Tani, Masataka Murata, Sadao Okano
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Publication number: 20040091294Abstract: In the image forming process of the present invention wherein a toner is fixed on an electrophotographic image-receiving sheet using a belt fixing and smoothing device, the relationship among the temperature of a heating and fixing roller, the melting point of a toner wax, and the glass transition point of a toner binder, the relationship among the temperature of a heating and fixing roller, the melting point of a wax in the image-receiving layer, and the glass transition point of a binder in the image-receiving layer, and the relationship between the polar components of surface free energy of the toner-image-receiving layer before and after image fixing are optimized. The present invention is to prevent offset in the toner and the toner-image-receiving layer of the electrophotographic image-receiving sheet upon releasing of the belt and to avoid deterioration in image quality especially in operation over the long run.Type: ApplicationFiled: October 24, 2003Publication date: May 13, 2004Applicants: FUJI PHOTO FILM CO., LID., FUJI XEROX CO., LTD.Inventors: Yoshio Tani, Kazuhito Miyake, Yasutomo Goto, Sadao Okano
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Publication number: 20030206757Abstract: In a fuser, a cooling structure (5) is disposed so that a bend angle (&agr;) of a part bent during the time between an endless belt (3) coming in contact with a press cooling face (5a) of the cooling structure (5) and exiting from the press cooling face (5a) is placed in the range of 0° C.<&agr;≦7° C. A fixing belt has a minute hardness of 0.1 to 5 at least on the belt surface coming in contact with toner T and preferably has a gloss degree of 75 or more on the belt surface.Type: ApplicationFiled: April 2, 2003Publication date: November 6, 2003Applicant: FUJI XEROX CO., LTD.Inventors: Kiyotaka Ishikawa, Yoshio Kanesawa, Motoi Noya, Sadao Okano, Shinichi Utsumi, Hideaki Seikiguchi, Kazuhisa Masuko, Michiaki Yasuno, Fumio Daishi, Makoto Omata
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Patent number: 6618573Abstract: In a fuser, a cooling structure (5) is disposed so that a bend angle (&agr;) of apart bent during the time between an endless belt (3) coming in contact with a press cooling face (5a) of the cooling structure (5) and exiting from the press cooling face (5a) is placed in the range of 0° C.<&agr;≦7° C. A fixing belt has a minute hardness of 0.1 to 5 at least on the belt surface coming in contact with toner T and preferably has a gloss degree of 75 or more on the belt surface.Type: GrantFiled: June 13, 2001Date of Patent: September 9, 2003Assignee: Fuji Xerox Co., Ltd.Inventors: Kiyotaka Ishikawa, Yoshio Kanesawa, Motoi Noya, Sadao Okano, Shinichi Utsumi, Hideaki Seikiguchi, Kazuhisa Masuko, Michiaki Yasuno, Fumio Daishi, Makoto Omata
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Patent number: 6567640Abstract: In a fuser, a cooling structure (5) is disposed so that a bend angle (&agr;) of a part bent during the time between an endless belt (3) coming in contact with a press cooling face (5a) of the cooling structure (5) and exiting from the press cooling face (5a) is placed in the range of 0° C.<&agr;≦7° C. A fixing belt has a minute hardness of 0.1 to 5 at least on the belt surface coming in contact with toner T and preferably has a gloss degree of 75 or more on the belt surface.Type: GrantFiled: September 27, 2002Date of Patent: May 20, 2003Assignee: Fuji Xerox Co., Ltd.Inventors: Kiyotaka Ishikawa, Yoshio Kanesawa, Motoi Noya, Sadao Okano, Shinichi Utsumi, Hideaki Seikiguchi, Kazuhisa Masuko, Michiaki Yasuno, Fumio Daishi, Makoto Omata
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Publication number: 20030035666Abstract: In a fuser, a cooling structure (5) is disposed so that a bend angle (&agr;) of apart bent during the time between an endless belt (3) coming in contact with a press cooling face (5a) of the cooling structure (5) and exiting from the press cooling face (5a) is placed in the range of 0° C.<&agr;≦7° C. A fixing belt has a minute hardness of 0.1 to 5 at least on the belt surface coming in contact with toner T and preferably has a gloss degree of 75 or more on the belt surface.Type: ApplicationFiled: September 27, 2002Publication date: February 20, 2003Applicant: FUJI XEROX CO., LTD.Inventors: Kiyotaka Ishikawa, Yoshio Kanesawa, Motoi Noya, Sadao Okano, Shinichi Utsumi, Hideaki Seikiguchi, Kazuhisa Masuko, Michiaki Yasuno, Fumio Daishi, Makoto Omata
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Publication number: 20020057934Abstract: In a fuser, a cooling structure (5) is disposed so that a bend angle (&agr;) of apart bent during the time between an endless belt (3) coming in contact with a press cooling face (5a) of the cooling structure (5) and exiting from the press cooling face (5a) is placed in the range of 0° C.<&agr;≦7° C. A fixing belt has a minute hardness of 0.1 to 5 at least on the belt surface coming in contact with toner T and preferably has a gloss degree of 75 or more on the belt surface.Type: ApplicationFiled: June 13, 2001Publication date: May 16, 2002Applicant: FUJI XEROX CO., LTD.Inventors: Kiyotaka Ishikawa, Yoshio Kanesawa, Motoi Noya, Sadao Okano, Shinichi Utsumi, Hideaki Seikiguchi, Kazuhisa Masuko, Michiaki Yasuno, Fumio Daishi, Makoto Omata
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Patent number: 5403688Abstract: A method for determining a termination time of the step of dispersing a coating composition for a photosensitive layer, containing a binder resin, a powdery charge generating material and a solvent, is disclosed, which comprises (i) providing coating (I) on a substrate by coating the coating composition, following by drying, (ii) providing coating (II) on a substrate by dispersing the coating composition using a dispersion medium to fine the powdery charge generating material, followed by drying, (iii) measuring absorbances of coating (I) at two wavelengths within a short wavelength region and a long wavelength region, respectively, of the spectral absorption wavelength of the charge generating material, (iv) measuring absorbances of coating (II) at the two wavelengthes within the short wavelength region and the long wavelength region, respectively, and (v) calculating spectral absorbance ratios of coatings (I) and (II), respectively, from the following equation: ##EQU1## wherein the dispersing of the coatingType: GrantFiled: January 28, 1991Date of Patent: April 4, 1995Assignee: Fuji Xerox Co., Ltd.Inventors: Seiji Ashiya, Taketoshi Hoshizaki, Ryosaku Igarashi, Koji Bando, Masanori Murase, Takahiro Suzuki, Masahiko Hodumi, Sadao Okano
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Patent number: 5324606Abstract: An electrophotographic photoreceptor comprising a conductive substrate having thereon a photosensitive layer as the uppermost layer, in which the photosensitive layer contains two charge transporting materials different in ionization potential, a charge transporting material having a higher ionization potential is present in the amount equimolar to or in an amount less than the equimolar amount to the other charge transporting material having a lower ionization potential.Type: GrantFiled: November 17, 1992Date of Patent: June 28, 1994Assignee: Fuji Xerox Co., Ltd.Inventors: Masahiko Hodumi, Masanori Murase, Sadao Okano, Koji Bando, Takahiro Suzuki, Seiji Ashiya