Patents by Inventor Hiroshi Niwa

Hiroshi Niwa 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).

  • Publication number: 20030123951
    Abstract: A circulation member of a ball screw for circulating a ball rolling on a spiral ball rolling groove formed on a screw shaft comprises a central portion and a pair of leg portions disposed at both ends of the central portion so as to extend therefrom and so that free ends of the leg portions are disposed in the spiral ball rolling groove at different positions to thereby form a ball circulation passage. The leg portions have inner peripheries having center lines inclined in directions different from each other with respect to a center line of an inner periphery of the central portion.
    Type: Application
    Filed: December 4, 2002
    Publication date: July 3, 2003
    Inventors: Hidekazu Michioka, Yasuyuki Abe, Hiroshi Niwa, Katsuya Iida, Toshiaki Kakuno, Takeki Shirai, Hironori Shoji
  • Publication number: 20030104742
    Abstract: This invention pertains to a method of improving the comfort, softness, and texture of textile products in both semi-finished and finished forms and the product of this method. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).
    Type: Application
    Filed: December 5, 2001
    Publication date: June 5, 2003
    Inventor: Hiroshi Niwa
  • Patent number: 6571653
    Abstract: Lubricant retaining slits (5) are formed on a pair of seal members (2) from end surfaces (2b) thereof facing inside in the axial direction of a nut (1) of a ball screw to intermediate portions of the seal members (2), and foreign bodies removing slits (6) are formed on the seal members (2) from end surfaces (2c) thereof facing outside in the axial direction of the nut (1) to intermediate portions thereof The lubricant retaining slits (5) can positively trap the lubricant invading into the gap between the seal member (2) and the screw shaft and returns the lubricant inside the nut (1). The foreign bodies removing slits (6) can remove the foreign bodies stored on the outer peripheral surface of the screw shaft and discharged outside the nut (1).
    Type: Grant
    Filed: June 6, 2001
    Date of Patent: June 3, 2003
    Assignee: THK Co., Ltd.
    Inventors: Ryuji Takeda, Tetsuhiro Nishide, Hiroshi Niwa, Mitsuaki Honma
  • Publication number: 20030039414
    Abstract: There is provided a rolling element spacer used in a rolling guide device having an endless circulation passage of balls, arranged alternately with many balls in the endless circulation passage, and circulating together with the balls in the endless circulation passage. It has a pair of ball holding seats each of which is formed in a concave spherical face form nearly approximating a spherical face of the ball and sliding-contacts with the ball and, around each ball holding seat, there is formed an annular dropout prevention portion protruding in a ball arranging direction than an edge portion of the ball holding seat and kept in non-contact with respect to the ball seated on the ball holding seat.
    Type: Application
    Filed: October 11, 2002
    Publication date: February 27, 2003
    Applicant: THK CO., LTD
    Inventors: Hiroshi Niwa, Kentarou Nishimura, Yasuyuki Abe, Kiyomi Tamura
  • Publication number: 20030028096
    Abstract: An endoscope apparatus comprises an endoscope having a treatment tool passage channel in at least an insertion portion, an adaptor for endoscope forceps opening, which can be detachably attached to a treatment tool insertion opening which is at one end of the treatment tool passage channel, an insertion shape detection probe provided with a plurality of shape detection elements which are to be passed and arranged in the treatment tool passage channel via the adaptor for endoscope forceps opening, an insertion shape detection unit for detecting magnetic field emitted from the shape detection elements of the insertion shape detection probe, an insertion shape detection device which drives the insertion shape detection probe and outputs video signals for visualizing the insertion shape from the signals corresponding to the magnetic field detected by the insertion shape detection unit, and a display device for displaying the insertion shape of the insertion portion based on the video signals output from the inser
    Type: Application
    Filed: July 31, 2002
    Publication date: February 6, 2003
    Applicant: OLYMPUS OPTICAL CO., LTD.
    Inventors: Hiroshi Niwa, Michio Sato, Akira Taniguchi, Fumiyuki Onoda, Sumihiro Uchimura, Chieko Aizawa
  • Patent number: 6513978
    Abstract: The present invention provides rolling element spacers used in a rolling guide unit provided with an endless circulating passage for balls; arranged with plural balls alternately therewith in the endless circulating passage; and circulated with these balls in the endless circulating passage. Each of the rolling element spacers has a pair of retaining seats which the balls contact, and is formed so that, on a ball cutting plane perpendicular to the center of rotation of each ball, each retaining seat and a relative ball contact each other at only the two portions of the retaining seat that are in the vicinity of both ends thereof.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: February 4, 2003
    Assignee: THK Co., Ltd.
    Inventors: Takeki Shirai, Hiroshi Niwa, Kentarou Nishimura, Yasuyuki Abe, Kiyomi Tamura
  • Publication number: 20020031285
    Abstract: The present invention provides rolling element spacers used in a rolling guide unit provided with an endless circulating passage for balls; arranged with plural balls alternately therewith in the endless circulating passage; and circulated with these balls in the endless circulating passage. Each of the rolling element spacers has a pair of retaining seats which the balls contact, and is formed so that, on a ball cutting plane perpendicular to the center of rotation of each ball, each retaining seat and a relative ball contact each other at only the two portions of the retaining seat that are in the vicinity of both ends thereof.
    Type: Application
    Filed: September 12, 2001
    Publication date: March 14, 2002
    Inventors: Takeki Shirai, Hiroshi Niwa, Kentarou Nishimura, Yasuyuki Abe, Kiyomi Tamura
  • Patent number: 6333848
    Abstract: The storage device reduces vibration accompanied by high-speed rotation of a storage media, and raises reliability as well. In a stationary position of amass object, each magnetic pole of the movable portion magnet is disposed so that their position is provided in opposite relation to each magnetic pole of a fixed portion magnet, and each magnetic pole of a movable portion magnet and the fixed portion magnet is opposite a different magnetic pole with respect to each other. An attraction force:F1 and a repulsion force:F2 between facing (or confronting) magnetic pole can be used efficiently, and a large vibration energy or inertia force can be obtained by a small-sized magnet.
    Type: Grant
    Filed: September 9, 1999
    Date of Patent: December 25, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasuhiko Aida, Yuuji Maeda, Hiroshi Niwa, Akimitsu Omori
  • Publication number: 20010037699
    Abstract: There is provided rolling element spacers that are used in a rolling guide device having an endless circulation path of balls and that are arranged to alternate with a multiplicity of balls and circulated in the endless circulation path along with the balls. They are constituted by a disc-shaped inner member having a pair of ball holding seats on which the balls slide in contact therewith and an annular outer member covering an outer circumferential surface of the inner member, and the outer member and inner member are molded from resin materials having different flexural modulo.
    Type: Application
    Filed: April 18, 2001
    Publication date: November 8, 2001
    Applicant: THK CO., LTD.
    Inventors: Yasuyuki Abe, Hiroshi Niwa, Kentarou Nishimura, Kiyomi Tamura
  • Publication number: 20010039234
    Abstract: There is provided a rolling element spacer used in a rolling guide device having an endless circulation passage of balls, arranged alternately with many balls in the endless circulation passage, and circulating together with the balls in the endless circulation passage. It has a pair of ball holding seats each of which is formed in a concave spherical face form nearly approximating a spherical face of the ball and sliding-contacts with the ball and, around each ball holding seat, there is formed an annular dropout prevention portion protruding in a ball arranging direction than an edge portion of the ball holding seat and kept in non-contact with respect to the ball seated on the ball holding seat.
    Type: Application
    Filed: April 20, 2001
    Publication date: November 8, 2001
    Applicant: THK CO., LTD
    Inventors: Hiroshi Niwa, Kentarou Nishimura, Yasuyuki Abe, Kiyomi Tamura
  • Publication number: 20010033357
    Abstract: A liquid crystal display having an injection hole post structures compatible with liquid crystal are formed in an area near an injection hole to prevent pollutants seeped from an end-sealing material from penetrating into a display area, thereby suppressing the occurrence of picture quality trouble which easily occurs in the display area. The liquid crystal display includes a first substrate 11 and a second substrate 12 which are disposed with a predetermined gap therebetween, in which liquid crystal is sealed in the gap.
    Type: Application
    Filed: January 23, 2001
    Publication date: October 25, 2001
    Inventors: Hiroshi Niwa, Hidefumi Yamashita, Tatsushi Koike, Yoshiaki Ohbayashi
  • Publication number: 20010026651
    Abstract: There is provided a rolling element spacer used in a rolling guide device having an endless circulation passage for balls, arranged alternately with many balls in the endless circulation passage, and circulating together with the balls in the endless circulation passage. In order to prevent the rolling element spacer from falling sideways and avoid a trouble such as malfunction of the rolling guide device, the rolling element spacer is formed such that its diagonal dimension in a thickness direction becomes larger than an inner diameter of the endless circulation passage.
    Type: Application
    Filed: March 12, 2001
    Publication date: October 4, 2001
    Applicant: THK CO., LTD
    Inventors: Hidekazu Michioka, Kentarou Nishimura, Yasuyuki Abe, Kiyomi Tamura, Hiroshi Niwa
  • Patent number: 6276225
    Abstract: A ball screw assembly includes a screw shaft with a spiral groove, balls along the groove, a nut with the screw shaft relatively rotatable with the balls, and a seal device.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: August 21, 2001
    Assignee: THK Co., Ltd.
    Inventors: Ryuji Takeda, Tetsuhiro Nishide, Hiroshi Niwa, Mitsuaki Honma
  • Patent number: 5896961
    Abstract: A dynamic vibration absorber comprises a movable portion including a movable weight portion, a movable portion magnet assembly provided with a movable inside magnet and a movable outside magnet which are mounted to the movable weight portion through a yoke so as to alternately provide different magnetic poles, a fixed portion fixed to an object to be damped, a fixed portion magnet assembly provided with a fixed portion inside magnet and a fixed portion outside magnet mounted to the fixed portion through a yoke so that the fixed portion magnet assembly has magnetic poles different from those of the movable portion magnet in opposed positions, respectively, and a conductor plate disposed in a gap defined between the fixed portion magnet assembly and the movable portion magnet assembly.
    Type: Grant
    Filed: October 1, 1996
    Date of Patent: April 27, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasuhiko Aida, Hiroshi Niwa, Yuji Maeda
  • Patent number: 5882012
    Abstract: An oil-submerged sliding member which has a good sealability and wear resistance and low attack to the mating member and which can be used with either a soft or a non-soft mating member. It is made from a resin composition comprising 30-88% by weight of a crosslinked polyallylene sulfide resin having a melt viscosity of 2000-5000 poise at 300.degree. C., 10-45% by weight of a carbon fiber, and 2-25% by weight of recycled polytetrafluoroethylene resin powder, and if required, not more than 10% by weight of molybdenum disulfide. Also, oil seal rings comprising the oil-submerged sliding member.
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: March 16, 1999
    Assignee: NTN Corporation
    Inventors: Hiroshi Niwa, Kazunori Kubota, Eiichiro Shimazu
  • Patent number: 5837767
    Abstract: Stripping fingers for use in a copying machine formed from a resin composition comprising 50-90% by weight of a thermoplastic polyimide resin, and 10-50% by weight of titanium oxide whiskers or zinc oxide whiskers. They may be formed from a resin composition comprising 50-80% by weight of a thermoplastic polyimide resin, 10-40% by weight of titanium oxide whiskers or zinc oxide whiskers, and 2-15% by weight of aromatic polyamide resin powder.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: November 17, 1998
    Assignee: NTN Corporation
    Inventors: Takumi Shimokusuzuno, Tomomi Nakamichi, Hiroshi Niwa
  • Patent number: 4885661
    Abstract: A mutli-layer ceramic capacitor principally made up of (a) internal electrode layers containing at least copper and (b) ceramic dielectric layers extending between the internal electrode layers. The materials which form the ceramic include copper oxide and an oxide component A and B, which component A is selected from group I of lead, calcium, strontium, and barium, and component B is selected from group II of magnesia, nickel, titanium, zirconium, zinc, niobium, tantalum, and tungsten. The component A includes at least lead and component B includes at least two of the substances in group II, and wherein a ratio between values a and b are chosen so that 0.985<a/b<1.110, where the value a denotes the total mol value of the substances in the component A and the value b denotes the total mol value of the substances in component B. The copper oxide component is present in an amount of about 0.03 to 0.65 wt % in terms of Cu.sub.2 O content.
    Type: Grant
    Filed: October 18, 1988
    Date of Patent: December 5, 1989
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoichiro Yokotani, Hiroshi Kagata, Hiroshi Niwa, Junichi Kato, Toshihiro Mihara