Patents by Inventor Akihide Fujita
Akihide Fujita 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: 11648978Abstract: A torque transmission joint to suppress occurrence of noise when reversing the direction of rotation of a drive shaft. A first transmission member fixed to an output shaft (the drive shaft) is engaged with a first elastic member such that a first gap in a circumferential direction is interposed, as well as with an intermediate transmission member such that a larger gap in the circumferential direction is interposed. A second transmission member fixed to an end portion of a worm is engaged with a second elastic member such that a second gap in the circumferential direction is interposed, as well as with the intermediate transmission member such that a larger gap in the circumferential direction is interposed. First and second annular convex portions are fitted to, respectively, first and second concave portions to prevent separation of the first and second elastic members with respect to the intermediate transmission member.Type: GrantFiled: March 28, 2018Date of Patent: May 16, 2023Assignee: NSK, LTD.Inventors: Toru Segawa, Ryou Oosawa, Toru Ishii, Ryota Sugihara, Takeshi Yamamoto, Akihide Fujita
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Publication number: 20210139072Abstract: Provided is a torque transmission joint that is able to suppress occurrence of noise when reversing the direction of rotation of the drive shaft. The first transmission member 17 fixed to the output shaft 12a which is a drive shaft is engaged with the first elastic member 20 in a state where the first gap in the circumferential direction is interposed, as well as with the intermediate transmission member 19 in a state where a gap in the circumferential direction which is larger than the first gap is interposed. The second transmission member 18 fixed to an end portion of the worm 8 is engaged with the second elastic member 21 in a state where the second gap in the circumferential direction is interposed, as well as with the intermediate transmission member 19 in a state where a gap in the circumferential direction which is larger than the second gap.Type: ApplicationFiled: March 28, 2018Publication date: May 13, 2021Inventors: Toru Segawa, Ryou Oosawa, Toru Ishii, Ryota Sugihara, Takeshi Yamamoto, Akihide Fujita
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Publication number: 20210122408Abstract: In a worm reducer, an urging member includes an urging shaft portion and an elastic pressing portion. The urging shaft portion is rotatably disposed inside a housing in a state in which a rotation center axis thereof is directed substantially parallel to a center axis of the worm wheel. The elastic pressing portion formed of an elastic material is externally fitted and fixed to a part of the urging shaft portion in an axial direction in an eccentric state with respect to the rotation center axis of the urging shaft portion. By rotating the urging shaft portion, an outer peripheral surface of the elastic pressing portion is pressed against an outer peripheral surface of a second bearing externally fitted to a worm shaft.Type: ApplicationFiled: July 18, 2018Publication date: April 29, 2021Applicant: NSK LTD.Inventor: Akihide FUJITA
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Patent number: 8529241Abstract: In an aspect of the present invention, since the maximum linear pressure when a sheet-like melted resin is nipped between an elastic roller and a cooling roller is controlled at 0.3 MPa to 3 MPa, the development of retardation in film forming can be prevented. According to the aspect, since an elastic roller and a cooling roller are rotated at nearly the same speed with the periphery speed ratio thereof at 0.99 to 1.01, a sheet-like melted resin can be transported without applying a stress caused by a rotation difference between the rollers, whereby the development of retardation on the unstretched thermoplastic resin film can be prevented. Further, since the surface temperature of a cooling roller is controlled so as to be 0.01° C. to 30° C. higher than that of an elastic roller, a sheet-like melted resin is pulled toward the elastic roller side, whereby the development of retardation can be prevented.Type: GrantFiled: March 22, 2008Date of Patent: September 10, 2013Assignee: FUJIFILM CorporationInventor: Akihide Fujita
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Publication number: 20120070615Abstract: Provided is a method for producing a polyester film, including: subjecting a polyester raw material resin, which contains a titanium compound and has an intrinsic viscosity of from 0.71 to 1.00, to melt extrusion using a twin-screw extruder which includes a cylinder; two screws disposed inside the cylinder; and a kneading disk unit disposed in at least a portion of a region extending from a 10%-position to a 65%-position of screw length with respect to an upstream end of the screws in a resin extrusion direction as a starting point, at a maximum shear rate generated inside the twin-screw extruder of from 10 sec?1 to 2000 sec?1; forming an unstretched film by cooling and solidifying the melt extruded polyester resin on a cast roll; subjecting the unstretched film to biaxial stretching in a longitudinal direction and a lateral direction; and heat fixing the stretched film formed by biaxial stretching.Type: ApplicationFiled: August 29, 2011Publication date: March 22, 2012Applicant: FUJIFILM CORPORATIONInventors: Zemin SHI, Akihide FUJITA, Akira YAMADA
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Patent number: 7927521Abstract: According to the present invention, a cellulose acylate film having high thickness precision and no streaks can be formed by producing a film with a cellulose acylate resin by means of the polishing roller method, and a high-performance optical film, which is free from the retardation distribution, can be produced by subsequently stretching the cellulose acylate film thus obtained within a magnification range from 1 or more and 2.5 or less.Type: GrantFiled: May 29, 2006Date of Patent: April 19, 2011Assignee: FUJIFILM CorporationInventors: Masaaki Otoshi, Akihide Fujita, Shinichi Nakai
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Publication number: 20110052837Abstract: A thermoplastic film having at least two thermoplastic resin layers laminated on each other, wherein at least the thermoplastic resin layer of the film surface and the thermoplastic resin layer of the film back each have a tilt structure in the thickness direction of the film, and in the plane including the tilt direction of the tilt structure and the film normal line, the sign of the angle, ? between the normal direction of the film surface and the tilt direction differs between the thermoplastic resin layer of the film surface and the thermoplastic resin layer of the film back, and wherein ? is from ?90° to 90°.Type: ApplicationFiled: August 26, 2010Publication date: March 3, 2011Applicant: FUJIFILM CORPORATIONInventors: Kiyokazu HASHIMOTO, Akihide FUJITA
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Publication number: 20100219558Abstract: When amorphous thermoplastic resin is supplied from a hopper, the resin is rotated by a screw in a barrel and generates frictional heat. In this point of view, in a melt extruder according to an aspect of the present invention, a temperature control zone that generates particularly high frictional heat is constantly cooled by a cooling device, and heated by a heating device to obtain a target temperature, thereby significantly reducing variations in barrel temperature. This can stabilize screw tip pressure, and reduce variations in thickness of a resin film discharged from the barrel.Type: ApplicationFiled: September 16, 2008Publication date: September 2, 2010Applicant: FUJIFILM CORPORATIONInventor: Akihide Fujita
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Publication number: 20100188619Abstract: There is provided a method for producing a thermoplastic film, which can suppress the occurrence of residual strain in the film caused by the polishing roller method to prevent the occurrence of stretch non-uniformity in stretching operation and provide a film that has excellent optical characteristics. The molten resin extruded from a die into a sheet is fed between a pair of polishing rollers and cooled while being held and pressed between them so that a cellulose acylate film is formed. The surface of the polishing roller is made up of a fluorine resin.Type: ApplicationFiled: May 29, 2006Publication date: July 29, 2010Applicant: FUJIFILM CorporationInventors: Masaaki Otoshi, Akihide Fujita, Shinichi Nakai
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Publication number: 20100168409Abstract: To provide a thermoplastic resin film, and process for producing the same, which can obtain a film having high optical properties in which the occurrence of residual strain and the exhibition of retardation during film forming are suppressed. A film (12) is produced by extruding melted thermoplastic resins in sheet form through a die (24), and sandwiching the sheet between a pair of rollers (26), (28) configured so that at least one of the rollers is an elastic roller (26) made from metal, to cool and solidify the sheet into the film, the thickness Z of a metal tube (44) constituting an outer shell of the elastic roller (26) being in a range of 0.05 mm<z<7.0 mm, wherein the sheet is formed as a laminate sheet having two or more layers by using two or more of the thermoplastic resins A, B, and in the laminate sheet a glass transition temperature Tg (° C.) of the thermoplastic resin B forming an inner layer is 3 to 50° C. less than the glass transition temperature Tg (° C.Type: ApplicationFiled: January 11, 2007Publication date: July 1, 2010Inventor: Akihide Fujita
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Publication number: 20100022764Abstract: According to the present invention, the adaptability to producing the cellulose acylate film and the surface properties of the cellulose acylate film produced by means of the melt film-forming method can be remarkably improved. Accordingly, there is also improved the surface properties of a stretched cellulose acylate film produced by stretching such an unstretched cellulose acylate film.Type: ApplicationFiled: May 29, 2006Publication date: January 28, 2010Applicant: FUJIFILM CorporationInventors: Masaaki Otoshi, Akihide Fujita, Shinichi Nakai
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Publication number: 20100015395Abstract: According to the present invention, a cellulose acylate film having high thickness precision and no streaks can be formed by producing a film with a cellulose acylate resin by means of the polishing roller method, and a high-performance optical film, which is free from the retardation distribution, can be produced by subsequently stretching the cellulose acylate film thus obtained within a magnification range from 1 or more and 2.5 or less.Type: ApplicationFiled: May 29, 2006Publication date: January 21, 2010Inventors: Masaaki Otoshi, Akihide Fujita, Shinichi Nakai
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Publication number: 20090283930Abstract: An aspect of the present invention is a method for manufacturing a thermoplastic resin film, comprising the steps of: extruding a molten thermoplastic resin from a die in the form of sheet; and sandwiching the sheet-form thermoplastic resin between one support and the other support, wherein at least one of the supports has such a surface property that the arithmetic average surface depth (Ra) is 100 nm or less, and the support is a hollow drum and the thickness Z (mm) of an outercylinder of the drum satisfies the following expression; 0.2 mm<Z (mm)<7.0 mm. According to the aspect, the thickness-direction retardation (Rth) of a thermoplastic resin film can be controlled.Type: ApplicationFiled: November 20, 2006Publication date: November 19, 2009Inventor: Akihide Fujita
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Publication number: 20090268290Abstract: A thermoplastic film capable of providing a film capable of suppressing the occurrence of retardation and having excellent optical characteristics by reducing the occurrence of strain caused by the polishing roller method, and a method for producing the film are provided. A molten resin is extruded from a die in a sheet shape, supplied between a pair of polishing rollers sandwiched by pressure with the pair of polishing rollers and cooled to form a cellulose acylate film. At least one polishing roller is composed of a metal elastic roll.Type: ApplicationFiled: November 15, 2006Publication date: October 29, 2009Applicant: Fujifilm CorporationInventor: Akihide Fujita
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Publication number: 20090227782Abstract: The present invention provides a method for producing a cellulose acylate film which can prevent the generation of foreign matter problems and can produce a high-quality film. A cellulose acylate resin is molten in a twin-screw extruder and extruded from a die to form a cellulose acylate film. The average residence time of the resin in the extruder is set at 5 minutes or less.Type: ApplicationFiled: June 6, 2006Publication date: September 10, 2009Applicant: FUJIFILM CORPORATIONInventors: Akihide Fujita, Masaaki Otoshi, Shinichi Nakai
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Publication number: 20090169810Abstract: A thermoplastic film capable of providing a film with excellent optical characteristics by reducing the occurrence of residual strain, and a method for producing the film are provided. The present invention provides the method for producing a thermoplastic film, comprising the steps of: extruding a molten thermoplastic resin from a die in a sheet shape; and forming a film by cooling and solidifying the sheet-shaped thermoplastic resin while sandwiching the sheet-shaped thermoplastic resin between a metal cooling roll and an endless metal belt capable of running with a stretched state, which have an arithmetic average surface roughness (Ra) of a roll surface and a belt surface of 100 nm or less as a surface property.Type: ApplicationFiled: November 15, 2006Publication date: July 2, 2009Applicant: FUJIFILM CorporationInventor: Akihide Fujita
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Publication number: 20090115100Abstract: The present invention provides a method for producing a thermoplastic film which makes it possible to improve the optical properties of the thermoplastic film obtained by stretching and a thermoplastic film manufactured thereby. The transverse stretching section in which a cellulose acylate film is transversely stretched includes: a preheating zone, a transverse stretching zone, a cooling zone and a thermal relaxation zone, and the cellulose acylate film having been cooled in the cooling zone is immediately subjected to thermal relaxation treatment in the thermal relaxation zone.Type: ApplicationFiled: October 31, 2006Publication date: May 7, 2009Applicant: FUJIFILM CORPORATIONInventors: Shinichi Nakai, Masaaki Otoshi, Akihide Fujita
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Publication number: 20090032986Abstract: According to an aspect of the invention, there is provided a method for manufacturing a thermoplastic resin film, comprising the steps of: extruding a molten thermoplastic resin from a die in the form of sheet and sandwiching the sheet-form thermoplastic resin between one drum and the other drum to cool, in which at least one of the drums has concave portions of 5 nm to 500 nm (both inclusive) depth in an area ratio of 0.5% to 20% (both inclusive). According to the aspect of the present invention, the sheet-form thermoplastic resin is excellent in handling, since desired convex portions are formed therein.Type: ApplicationFiled: November 20, 2006Publication date: February 5, 2009Applicant: FUJIFILM CorporationInventor: Akihide Fujita
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Publication number: 20080233310Abstract: In an aspect of the present invention, since the maximum linear pressure when a sheet-like melted resin is nipped between an elastic roller and a cooling roller is controlled at 0.3 MPa to 3 MPa, the development of retardation in film forming can be prevented. According to the aspect, since an elastic roller and a cooling roller are rotated at nearly the same speed with the periphery speed ratio thereof at 0.99 to 1.01, a sheet-like melted resin can be transported without applying a stress caused by a rotation difference between the rollers, whereby the development of retardation on the unstretched thermoplastic resin film can be prevented. Further, since the surface temperature of a cooling roller is controlled so as to be 0.01° C. to 30° C. higher than that of an elastic roller, a sheet-like melted resin is pulled toward the elastic roller side, whereby the development of retardation can be prevented.Type: ApplicationFiled: March 22, 2008Publication date: September 25, 2008Applicant: FUJIFILM CORPORATIONInventor: Akihide FUJITA
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Publication number: 20070264448Abstract: The present invention provides a method of manufacturing a thermoplastic resin film comprising the steps of: extruding a molten thermoplastic resin from a die in a form of sheet; cooling and solidifying the thermoplastic resin sheet by sandwiching the sheet between a pressurizing/cooling roller and a press roller; and further cooling and solidifying the thermoplastic resin sheet while transferring the thermoplastic resin sheet by a plurality of cooling rollers, wherein the temperature of each of the cooling rollers is set at within a range of ±3° C. relative to sheet temperature of the thermoplastic resin sheet in contact with the cooling roller; at the same time, the sheet temperature of the thermoplastic resin sheet when removed from the cooling roller arranged most downstream of the cooling rollers is set to be equal to or less than a glass transition temperature Tg(° C.) of the thermoplastic resin ?15° C.Type: ApplicationFiled: May 2, 2007Publication date: November 15, 2007Applicant: FUJIFILM CorporationInventor: Akihide Fujita