Patents by Inventor Masayoshi Shimamura
Masayoshi Shimamura 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: 20030215731Abstract: In a developing assembly, a process cartridge and an image-forming method, a specific developer and a specific developer-carrying member are used in combination. The developer comprises toner particles containing at least a binder resin and a colorant, and conductive fine particles; the toner particles having a Circularity a of less than 0.Type: ApplicationFiled: August 15, 2002Publication date: November 20, 2003Applicant: Canon Kabushiki KaishaInventors: Kazunori Saiki, Yasuhide Goseki, Masayoshi Shimamura, Yasutaka Akashi, Kenji Fujishima, Satoshi Otake, Naoki Okamoto
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Publication number: 20030147674Abstract: In a developing assembly including a two-component developer container and a developer-carrying member, the developer-carrying member has at least a substrate and a resin coat layer formed on the substrate surface, and the resin coat layer contains at least a binder resin and solid particles for making the resin coat layer surface uneven. The solid particles satisfying an average circularity of 0.Type: ApplicationFiled: October 29, 2002Publication date: August 7, 2003Applicant: CANON KABUSHIKI KAISHAInventors: Satoshi Otake, Yasuhide Goseki, Masayoshi Shimamura, Yasutaka Akashi, Kenji Fujishima, Kazunori Saiki, Naoki Okamoto
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Publication number: 20030123909Abstract: A developing assembly is disclosed having at least a developer container, a developer-carrying member and a developer layer thickness regulation member, wherein the developer is composed mainly of toner particles containing at least a binder resin and a colorant, and conductive fine particles, and the developer-carrying member has a substrate and a surface layer formed on the substrate of a non-magnetic metal, an alloy or a metallic compound. This developing assembly causes no sleeve ghost, enables electrostatic latent images to be faithfully developed, causes no fading phenomenon, and enables high-density images to be formed in every environment. Also disclosed are a process cartridge having the developing assembly and the latent-image-bearing member integrally set as one unit detachably mountable on the main body of an image-forming apparatus, and an image-forming method making use of the features of this developing assembly.Type: ApplicationFiled: August 16, 2002Publication date: July 3, 2003Applicant: Canon Kabushiki KaishaInventors: Yasutaka Akashi, Yasuhide Goseki, Masayoshi Shimamura, Kenji Fujishima, Kazunori Saiki, Satoshi Otake, Naoki Okamoto
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Publication number: 20030007341Abstract: There are included the steps of forming a structure, in which a first adhesive layer, a resin layer, and a metal foil are laminated sequentially from a bottom, on a release layer of a plastic film that has the release layer on a surface, forming metal layer patterns by patterning the metal foil, and forming the first adhesive layer, the resin layer, and the metal layer patterns sequentially from the bottom on a transparent substrate by separating the release layer from the first adhesive layer along an interface and then pasting the first adhesive layer onto the transparent substrate.Type: ApplicationFiled: May 20, 2002Publication date: January 9, 2003Inventors: Masayoshi Shimamura, Ryohei Okamoto, Yoshiyuki Atsuchi
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Publication number: 20020176931Abstract: A used developer-carrying member having a resin coating layer on a substrate is regenerated through a step of scraping the resin coating layer of the used developer-carrying member to form a developer-carrying member surface having unevenness showing a central line-average roughness Ra of at most 0.8 &mgr;m, and a step of coating the developer-carrying member surface having the unevenness with a coating layer of a resinous composition comprising at least a binder resin and electroconductive fine powder. The regenerated developer-carrying member can be reinstalled in a developing apparatus and subjected to repetitive electrophotographic image forming cycles.Type: ApplicationFiled: January 14, 2002Publication date: November 28, 2002Applicant: Canon Kabushiki KaishaInventors: Yasuhide Goseki, Masayoshi Shimamura, Yasutaka Akashi, Kenji Fujishima, Kazunori Saiki, Satoshi Otake, Naoki Okamoto
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Patent number: 6391511Abstract: A developing apparatus has a developer container for holding a developer, a developer carrying member for carrying a positively chargeable developer held in the developer container and transporting the developer to a developing zone and a developer layer-thickness regulating member for regulating the thickness of a positively chargeable developer layer to be formed on the developer carrying member. The developer carrying member has at least a substrate and a resin coat layer formed of a resin composition on the surface of the substrate. The resin composition contains at least (I) a binder resin, (II) a conductive fine powder, (III) spherical particles having a number-average particle diameter of from 0.3 &mgr;m to 30 &mgr;m and (IV) a quaternary ammonium salt compound which is positively chargeable to iron powder.Type: GrantFiled: April 13, 1999Date of Patent: May 21, 2002Assignee: Canon Kabushiki KaishaInventors: Naoki Okamoto, Yasuhide Goseki, Masayoshi Shimamura, Kenji Fujishima, Kazunori Saiki, Satoshi Otake
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Patent number: 6154625Abstract: A developing apparatus is disclosed which has a developer container, a developer carrying member for carrying a positively chargeable developer held in the developer container and transporting the developer to a developing zone, and a developer layer-thickness regulating member for regulating the thickness of a developer layer formed on the developer carrying member. The developer carrying member has a resin coat layer formed of a resin composition containing at least a resin selected from the group consisting of a phenol resin and a polyamide resin, a conductive material and a quaternary ammonium salt compound which is positively chargeable to iron powder. The resin composition may contain a urethane resin in place of the phenol resin and polyamide resin.Type: GrantFiled: December 17, 1998Date of Patent: November 28, 2000Assignee: Canon Kabushiki KaishaInventors: Kazunori Saiki, Yasuhide Goseki, Masayoshi Shimamura, Kenji Fujishima, Satoshi Otake, Naoki Okamoto
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Patent number: 6122473Abstract: A developer carrying member for carrying a developer is includes a substrate and a resin coat layer which is formed on the surface of the substrate and contains a binder resin and a conductive fine powder. The binder resin is composed of a copolymer having a monomeric unit of a methyl methacrylate monomer (M) and a monomeric unit of a nitrogen-containing vinyl monomer (N). A copolymerization molar ratio of the methyl methacrylate monomer (M) to the nitrogen-containing vinyl monomer (N) in the copolymer fulfills the following condition: M:N=4:1 to 999:1. The binder resin has a weight-average molecular weight (Mw) of from 3,000 to 50,000.Type: GrantFiled: March 31, 1998Date of Patent: September 19, 2000Assignee: Canon Kabushiki KaishaInventors: Yasuhide Goseki, Masayoshi Shimamura, Kenji Fujishima, Michiko Orihara, Kazunori Saiki, Satoshi Otake, Naoki Okamoto
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Patent number: 5998008Abstract: A developer carrying member is comprised of a substrate and a coat layer which covers the surface of the substrate. The coat layer contains at least a binder resin, conductive spherical particles having a number average particle diameter of from 0.3 .mu.m to 30 .mu.m and a true density of 3 g/cm.sup.3 or below, and a nitrogen-containing heterocyclic compound, the particles and the compound being dispersed in the binder resin.Type: GrantFiled: May 28, 1997Date of Patent: December 7, 1999Assignee: Canon Kabushiki KaishaInventors: Masayoshi Shimamura, Yasuhide Goseki, Kenji Fujishima, Michiko Orihara, Kazunori Saiki, Satoshi Otake
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Patent number: 5860050Abstract: A developer carrying member includes a substrate, the surface of which is covered with a conducting layer. The conducting layer contains a binder resin and conducting spherical particles dispersed therein having a number average particle diameter of from 0.3 .mu.m to 30 .mu.m and a true density of 3 g/cm.sup.3 or below.Type: GrantFiled: June 27, 1997Date of Patent: January 12, 1999Assignee: Canon Kabushiki KaishaInventors: Masayoshi Shimamura, Yasuhide Goseki, Kenji Fujishima, Michiko Orihara, Kazunori Saiki, Mayoko Maruyama, Takuya Toyooka
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Patent number: 5716746Abstract: A magnetic toner which is excellent in the low temperature fixability and the anti-offset properties is disclosed. The binder resin of the toner comprises a non-crosslinked styrene polymer, a non-crosslinked styrene copolymer or a mixture of these, and a polyolefin, wherein;the binder resin has, in its molecular weight distribution pattern measured by gel permeation chromatography (GPC), at least one maximal point (peak) in each region of a low molecular weight of from 5,000 to 20,000 and of a high molecular weight of from 200,00 to 1,000,000, where a height H1 of a maximum peak in the low molecular weight region, a height H3 of a maximum peak in the high molecular weight region and a height H2 of a minimal point between both of said peaks satisfy the relationship H1:H2:H3 of 3-25:1:1.5-12; and has a weight average molecular weight Mw and a number average molecular weight Mn in a value Mw/Mn of from 15 to 80.Type: GrantFiled: May 23, 1994Date of Patent: February 10, 1998Assignee: Canon Kabushiki KaishaInventors: Yushi Mikuriya, Toshiaki Nakahara, Masayoshi Shimamura, Kuniko Kobayashi, Kazuyoshi Hagiwara, Masami Fujimoto
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Patent number: 5618647Abstract: A magnetic toner has magnetic toner particles containing a binder resin and a magnetic material, and an inorganic fine powder treated with an organic compound. The magnetic toner has a volume average particle diameter D.sub.v (.mu.m) of 3 .mu.m.ltoreq.D.sub.v <6 .mu.m, a weight average particle diameter D.sub.4 (.mu.m) of 3.5 .mu.m.ltoreq.D.sub.4 <6.5 .mu.m, a percentage M.sub.r of particles with particle diameters of 5 .mu.m or smaller in number particle size distribution of the magnetic toner, of 60% by number<M.sub.r .ltoreq.90% by number, and the ratio of a percentage N.sub.r of particles with particle diameters of 3.17 .mu.m or smaller in number particle size distribution of the magnetic toner to a percentage N.sub.v of particles with particle diameters of 3.17 .mu.m or smaller in volume particle size distribution of the magnetic toner, N.sub.r /N.sub.v, of from 2.0 to 8.0.Type: GrantFiled: August 28, 1995Date of Patent: April 8, 1997Assignee: Canon Kabushiki KaishaInventors: Tsutomu Kukimoto, Yasuhide Goseki, Motoo Urawa, Masayoshi Shimamura, Keiji Okano, Keita Nozawa, Satoshi Yoshida, Masaki Ojima
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Patent number: 5354637Abstract: A magnetic toner is constituted by at least a binder resin and a magnetic iron oxide. The magnetic iron oxide is characterized by having an Fe(II) content of 18.5-24.1 wt. %, and shows a BET specific surface area of S (m.sup.2 /g) and an X-ray diffraction pattern giving a half-value width W (deg.) of a diffraction peak corresponding to 311 plane of the magnetic iron oxide in spinel structure, the values S and W satisfying: 4.5.times.10.sup.-3 S+0.130.ltoreq.W.ltoreq.4.5.times.10.sup.-3 S+0.160, and 4.5.ltoreq.S.ltoreq.11.0. Alternatively, the magnetic iron oxide is characterized by having a number-average particle size D satisfying a relationship with W of: -0.08D+0.180.ltoreq.W.ltoreq.-0.08D+0.212, and 0.10.ltoreq.D.ltoreq.0.45. The relationship between W and S or D indicates a good crystallinity of the magnetic iron oxide which provides the magnetic toner with a stable performance for a long period of time. The magnetic iron oxide can be obtained through a heating treatment at a temperature of 130.degree.Type: GrantFiled: June 12, 1992Date of Patent: October 11, 1994Assignee: Canon Kabushiki KaishaInventors: Masayoshi Shimamura, Toshiaki Nakahara, Kuniko Kobayashi, Kazuyoshi Hagiwara, Yushi Mikuriya, Masami Fujimoto
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Patent number: 5213933Abstract: A positively chargeable magnetic toner comprises positively chargeable magnetic toner particles having at least a binder resin, a magnetic substance and a charge controlling agent; wherein the binder resin contains (A) a vinyl polymer having carboxyl groups, acid anhydride groups, partial esters thereof or mixtures of the groups and having and an acid value of 5 to 30, and (B) a copolymer obtained by polymerizing at least a diolefin monomer and a vinyl monomer; and wherein the charge controlling agent contains (C) a quaternary ammonium salt and (D) a nigrosine dye or a triphenylmethane dye, the ratio by weight among the components (A), (B), (C) and (D) being within the range of (A):(B):(C):(D)=80 to 30:70 to 20:2.0 to 0.5: 2.0 to 0.1 relative to 100 parts of the total weight of the components (A) and (B). The present invention also provides an image forming process, an image forming apparatus and a facsimile apparatus, all of which use the positively chargeable magnetic toner.Type: GrantFiled: May 28, 1991Date of Patent: May 25, 1993Assignee: Canon Kabushiki KaishaInventors: Ichirou Osaki, Keita Nozawa, Kuniko Kobayashi, Masatsugu Fujiwara, Masayoshi Shimamura
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Patent number: 5176971Abstract: A technique related to color filters to be arranged on the light-receiving surface of a color liquid crystal display device, color video camera, and the like. The color filter consists of a substrate (10) and a colored filter layer (12) formed thereon. The colored filter layer (12) comprises, for example, three groups of filter picture elements (14R), 14G, 14B) having spectral characteristics respectively corresponding to red, green and blue. Each group of filter picture elements are made of polyimide resin and dye contained therein. Further, each group of the filter picture elements (R, G, B) are arranged in direct contact with one surface of the substrate (10) without using any intermediate protecting film. The first group of filter picture elements patterned on one surface of the substrate (10) are subjected to heat treatment at a high temperature of about 250.degree. C., for example, to increase their resistance against the solvent.Type: GrantFiled: August 5, 1991Date of Patent: January 5, 1993Assignee: Kyodo Printing Co., Ltd.Inventors: Masayoshi Shimamura, Tadahiro Furukawa, Akiyoshi Murakami, Toshio Haga
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Patent number: 5166032Abstract: A cooler toner, comprising a binder resin and a colorant, wherein the colorant comprises organic pigment particles treated with an isocyanic ester or a silicon-containing compound.Type: GrantFiled: March 12, 1992Date of Patent: November 24, 1992Assignee: Canon Kabushiki KaishaInventors: Tatsuya Nakamura, Hiromi Mori, Masayoshi Shimamura, Reiko Morimoto
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Patent number: 4837098Abstract: A technique related to color filters to be arranged on the light-receiving surface of a color liquid crystal display device, color video camera, and the like. The color filter consists of a substrate (10) and a colored filter layer (12) formed thereon. The colored filter layer (12) comprises, for example, three groups of filter picture elements (14R, 14G, 14B) having spectral characteristics respectively corresponding to red, green and blue. Each group of filter picture elements are made of polyimide resin and dye contained therein. Further, each group of the filter picture elements (R, G, B) are arranged in direct contact with one surface of the substrate (10) without using any intermediate protecting film. The first group of filter picture elements patterned on one surface of the substrate (10) are subjected to heat treatment at a high temperature of about 250.degree. C., for example, to increase their resistance against the solvent.Type: GrantFiled: September 19, 1986Date of Patent: June 6, 1989Assignee: Kyodo Printing Co., Ltd.Inventors: Masayoshi Shimamura, Tadahiro Furukawa, Akiyoshi Murakami, Toshio Haga