Patents by Inventor Takuji Yamada
Takuji Yamada 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: 20130215531Abstract: A sleeve supports a shaft. A housing member is arranged so as to surround the sleeve and make the end of the sleeve protrude. A base member holds the housing member and fixes a stator core so as to surround the housing member. A hub drives a recording disk by being rotated integrally with the shaft, with a magnet being fixed to an annular portion concentric with the shaft so as to face the stator core fixed to the base member. A thrust member is rotated integrally with the hub, and a descender portion and a ring portion.Type: ApplicationFiled: March 25, 2013Publication date: August 22, 2013Applicant: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Takuji Yamada, Yuji Omura, Mitsuo Kodama
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Patent number: 8506168Abstract: A disk drive device includes a rotating body, a fluid dynamic bearing unit that rotatably supports the rotating body, and a drive unit. The fluid dynamic bearing unit has: a lubricant holding portion in which lubricant is held; a first thrust dynamic pressure groove with which a first thrust dynamic pressure generating portion for generating the dynamic pressure in the pump-in direction, which is oriented toward the inside of the lubricant holding portion, is structured; and a second thrust dynamic pressure groove with which a second thrust dynamic pressure generating portion for generating at least the dynamic pressure in the pump-out direction, is structured.Type: GrantFiled: July 16, 2010Date of Patent: August 13, 2013Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Takuji Yamada, Mitsuo Kodama
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Patent number: 8427778Abstract: A sleeve supports a shaft. A housing member is arranged so as to surround the sleeve and make the end of the sleeve protrude. A base member holds the housing member and fixes a stator core so as to surround the housing member. A hub drives a recording disk by being rotated integrally with the shaft, with a magnet being fixed to an annular portion concentric with the shaft so as to face the stator core fixed to the base member. A thrust member is rotated integrally with the hub, and a descender portion and a ring portion.Type: GrantFiled: June 22, 2012Date of Patent: April 23, 2013Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Takuji Yamada, Yuji Omura, Mitsuo Kodama
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Patent number: 8427779Abstract: In a disk drive device, a recording disk is mounted on a rotor. A base has a bearing hole, the center of which is along the rotational axis of the rotor. A bearing unit rotatably supports the rotor with respect to the base, the bearing unit being glued to the bearing hole. A ring-shaped first groove, the center of which is along the rotational axis, is arranged on a side surface of the bearing hole. A ring-shaped second groove, the center of which is along the rotational axis, is arranged on an outer surface of the housing, the outer surface contacting the side surface of the bearing hole. The position of the second groove with respect to its direction along the rotational axis is different from the position of the first groove with respect to its direction along the rotational axis. The base and the bearing unit are electrically connected by a conductive resin applied along an edge portion of the bearing hole, the edge portion being on a lower surface of the base.Type: GrantFiled: April 28, 2010Date of Patent: April 23, 2013Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.Inventors: Naoki Shinji, Takuji Yamada
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Publication number: 20120262822Abstract: A sleeve supports a shaft. A housing member is arranged so as to surround the sleeve and make the end of the sleeve protrude. A base member holds the housing member and fixes a stator core so as to surround the housing member. A hub drives a recording disk by being rotated integrally with the shaft, with a magnet being fixed to an annular portion concentric with the shaft so as to face the stator core fixed to the base member. A thrust member is rotated integrally with the hub, and a descender portion and a ring portion.Type: ApplicationFiled: June 22, 2012Publication date: October 18, 2012Applicant: ALPHANA TECHNOLOGY CO., LTD.Inventors: Takuji YAMADA, Yuji OMURA, Mitsuo KODAMA
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Publication number: 20120213459Abstract: A rotating device includes: a rotating body, a fixed body and lubricant. A surrounding member in the fixed body has a sleeve and a housing for surrounding the sleeve. A first radial dynamic pressure generating groove and a second radial dynamic pressure generating groove are formed on at least one of the inner circumferential surface of the sleeve and the outer circumferential surface of a shaft in the rotating body. The sleeve has a flange portion protruding radially outward at the end portion of the sleeve near to a hub in the rotating body. A concave portion, which is made by axially concaving at least part of the area corresponding to a wall thickness of the sleeve on the inner circumference side of the flange portion, is circumferentially provided in the flange portion.Type: ApplicationFiled: February 10, 2012Publication date: August 23, 2012Applicant: ALPHANA TECHNOLOGY CO., LTD.Inventors: Takuji YAMADA, Takanori WATANABE, Susumu ANDO
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Patent number: 8243383Abstract: A sleeve supports a shaft. A housing member is arranged so as to surround the sleeve and make the end of the sleeve protrude. A base member holds the housing member and fixes a stator core so as to surround the housing member. A hub drives a recording disk by being rotated integrally with the shaft, with a magnet being fixed to an annular portion concentric with the shaft so as to face the stator core fixed to the base member. A thrust member is rotated integrally with the hub, and a descender portion and a ring portion.Type: GrantFiled: October 8, 2009Date of Patent: August 14, 2012Assignee: Alphana Technology Co., Ltd.Inventors: Takuji Yamada, Yuji Omura, Mitsuo Kodama
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Publication number: 20120033324Abstract: A rotating body for a fluid dynamic bearing used for rotating a recording disk that has been mounted therein include: a rotating shaft portion in which a cylindrical portion that serves as a rotating shaft and a protruding portion extended radially outward from one end of the cylindrical portion are formed integrally with each other; and a hub that is to be connected to the end portion near to the outer circumference of the protruding portion and that has a mounting seat portion on which the recording disk is to be mounted.Type: ApplicationFiled: August 2, 2011Publication date: February 9, 2012Applicant: ALPHANA TECHNOLOGY CO., LTD.Inventors: Akira MURAMATSU, Takuji YAMADA
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Publication number: 20110279925Abstract: In a disk drive device, a magnetic recording disk is mounted on a hub. A base rotatably supports the hub via a bearing unit. The base has a ring-shaped wall that surrounds the bearing unit and that protrudes towards the hub. A laminated core is fixed to the base. The laminated core has a ring portion and twelve teeth that radially outwardly extend from the ring portion. Coils are wound around the twelve teeth. The base includes an increasing-thickness portion formed so that the less the distance between a part of the increasing-thickness portion and the ring-shaped wall is, the thicker the part of the increasing-thickness portion becomes.Type: ApplicationFiled: May 10, 2011Publication date: November 17, 2011Applicant: ALPHANA TECHNOLOGY CO., LTD.Inventors: Takanori WATANABE, Takuji YAMADA, Susumu ANDO, Hiroshi IWAI
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Publication number: 20110109995Abstract: A bearing lubricant includes a base oil containing an ester compound consisting of 2-ethyl-2-methyl-1,3-propanediol and at least one of carboxylic acids having 5 to 12 carbon atoms, the ester compound being represented by the following formula (1), in which the base oil has a kinetic viscosity at approximately 40° C. of approximately 7 to 15 mPa, and has a pour point of approximately ?60° C. or less: where R1 and R2 represent hydrocarbon groups having 4 to 11 carbon atoms.Type: ApplicationFiled: November 10, 2009Publication date: May 12, 2011Applicants: ALPHANA TECHNOLOGY CO., LTD., BALBIS CO., LTD.Inventors: Mitsuo KODAMA, Takuji YAMADA, Hiroyuki ANZAI
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Publication number: 20110033143Abstract: A disk drive device includes a rotating body, a fluid dynamic bearing unit that rotatably supports the rotating body, and a drive unit. The fluid dynamic bearing unit has: a lubricant holding portion in which lubricant is held; a first thrust dynamic pressure groove with which a first thrust dynamic pressure generating portion for generating the dynamic pressure in the pump-in direction, which is oriented toward the inside of the lubricant holding portion, is structured; and a second thrust dynamic pressure groove with which a second thrust dynamic pressure generating portion for generating at least the dynamic pressure in the pump-out direction, is structured.Type: ApplicationFiled: July 16, 2010Publication date: February 10, 2011Applicant: ALPHANA TECHNOLOGY CO., LTD.Inventors: Takuji Yamada, Mitsuo Kodama
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Publication number: 20100328819Abstract: In a disk drive device, a recording disk is mounted on a rotor. A base has a bearing hole, the center of which is along the rotational axis of the rotor. A bearing unit rotatably supports the rotor with respect to the base, the bearing unit being glued to the bearing hole. A ring-shaped first groove, the center of which is along the rotational axis, is arranged on a side surface of the bearing hole. A ring-shaped second groove, the center of which is along the rotational axis, is arranged on an outer surface of the housing, the outer surface contacting the side surface of the bearing hole. The position of the second groove with respect to its direction along the rotational axis is different from the position of the first groove with respect to its direction along the rotational axis. The base and the bearing unit are electrically connected by a conductive resin applied along an edge portion of the bearing hole, the edge portion being on a lower surface of the base.Type: ApplicationFiled: April 28, 2010Publication date: December 30, 2010Applicant: ALPHANA TECHNOLOGY CO., LTD.Inventors: Naoki SHINJI, Takuji YAMADA
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Publication number: 20100288691Abstract: An object of the invention is to provide a porous filter cartridge that hardly involves the contamination problem, provides an economic advantage, and is able to achieve efficient filtration and extraction without breaking. The object is accomplished by a porous filter cartridge including a bottomed cylindrical cap 5 with an outlet opening 29 at the bottom and a porous filter held inside the cap 5 on the bottom. At the bottom of the cap 5 a plurality of ribs 35, 37, and 39 are arranged radially about the outlet opening 29 in a standing condition to support the porous filter. At least some of the ribs are connected to each other at the center of the outlet opening 29 to span the outlet opening 29 to form a junction 43. The junction 43 has a top surface 41 convex to the porous filter side.Type: ApplicationFiled: January 19, 2009Publication date: November 18, 2010Applicant: FUJIFILM CORPORATIONInventors: Keiji Shigesada, Morio Fujiwara, Takuji Yamada, Katsuya Inana
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Patent number: 7828724Abstract: There is provided a flexible tube for an endoscope, including a framed structure unit having a plurality of joint members rotatably coupled to each other so that the framed structure unit is able to bend freely, each joint member having a form of a short cylinder, a reticulated tube that is reticulated with thread and is formed to cover the framed structure unit, and a flexible sheath that has flexibility and is formed to cover the reticulated tube. Further, a cross section of an outer surface of the flexible sheath has a circular shape, and a cross section of an outer surface of each joint member has a non-circular shape so that a wall thickness of the flexible sheath has a thicker part in a particular direction about an axis line of the flexible tube than another part of the wall thickness of the flexible sheath.Type: GrantFiled: January 10, 2007Date of Patent: November 9, 2010Assignee: Hoya CorporationInventors: Masayoshi Hosoi, Takuji Yamada
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Publication number: 20100195248Abstract: A sleeve supports a shaft. A housing member is arranged so as to surround the sleeve and make the end of the sleeve protrude. A base member holds the housing member and fixes a stator core so as to surround the housing member. A hub drives a recording disk by being rotated integrally with the shaft, with a magnet being fixed to an annular portion concentric with the shaft so as to face the stator core fixed to the base member. A thrust member is rotated integrally with the hub, and a descender portion and a ring portion.Type: ApplicationFiled: October 8, 2009Publication date: August 5, 2010Applicant: ALPHANA TECHNOLOGY CO., LTD.Inventors: Takuji YAMADA, Yuji OMURA, Mitsuo KODAMA
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Patent number: 7745968Abstract: A motor includes a sleeve, a sleeve holder, a rotor hub and an inner body. The sleeve has a flange portion on an outer circumference portion thereof. The sleeve holder holds the sleeve. The rotor hub has an annular wall portion. The inner body is fixed in an inside of the annular wall portion so as to surround the sleeve and the sleeve holder. The inner body has an annular protrusion portion which is sandwiched between the flange portion and one end portion of the sleeve holder on an inner circumference portion of thereof. A first thrust bearing portion in which a lubrication agent is filled is formed between the annular protrusion portion and the flange portion. A second thrust bearing portion in which the lubrication agent is filled is formed between the annular protrusion portion and the one end portion of the sleeve holder.Type: GrantFiled: September 6, 2007Date of Patent: June 29, 2010Assignee: Alphana Technology Co., Ltd.Inventors: Mitsuo Kodama, Takuji Yamada, Matomo Nagaoka
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Publication number: 20100138093Abstract: An energy supply amount control system may be applied, for example, to a hybrid vehicle using two ore more energy sources such as gasoline and electricity (motor). The energy supply amount control system includes route search means and energy cost calculation means. The energy cost calculation means detects a section where electric energy can be regenerated on a route searched by the route search means. The energy cost calculation means calculates a cost (fare) required when the motor alone is used for travelling in a section other than the detected section and a cost (fare) required when the motor and the gasoline are both used for travelling. The costs (fares) are represented to a user and the energy selected by the user is supplied by the energy supply amount control means.Type: ApplicationFiled: April 14, 2008Publication date: June 3, 2010Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yusuke Oku, Takuji Yamada
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Patent number: D580558Type: GrantFiled: March 28, 2007Date of Patent: November 11, 2008Assignee: FUJIFILM CorporationInventors: Keiji Shigesada, Morio Fujiwara, Takuji Yamada, Katsuya Inana
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Patent number: D597679Type: GrantFiled: April 4, 2008Date of Patent: August 4, 2009Assignee: FUJIFILM CorporationInventors: Keiji Shigesada, Morio Fujiwara, Takuji Yamada, Katsuya Inana
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Patent number: D598122Type: GrantFiled: April 4, 2008Date of Patent: August 11, 2009Assignee: FUJIFILM CorporationInventors: Keiji Shigesada, Morio Fujiwara, Takuji Yamada, Katsuya Inana