Patents Assigned to Minebea Kabushiki Kaisha (Minebea Co., Ltd.)
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Patent number: 6402387Abstract: A double seal bearing includes a labyrinth seal mechanism. The double seal bearing is provided with a pair of annular inner and outer sealing plates having respective central openings with a remaining slight clearance between each respective sealing plate and one of the inner and outer races, respectively, so as to assure the labyrinth seal function.Type: GrantFiled: July 17, 1998Date of Patent: June 11, 2002Assignee: Minebea Kabushiki-Kaisha (Minebea Co., Ltd.)Inventor: Rikuro Obara
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Publication number: 20020057857Abstract: An anti-frictional bearing which is reduced in its asynchronous rotational run out so that the cumbersome analyzing operation of the raceway surface and selecting operation of inner and/or outer races are not required. The bearing will contribute for the high packaging density and high speed operation of the hard disk device.Type: ApplicationFiled: November 28, 2001Publication date: May 16, 2002Applicant: MINEBEA KABUSHIKI-KAISHA (MINEBEA CO., LTD.)Inventors: Hiroyuki Yajima, Hideki Matsuoka
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Publication number: 20020018607Abstract: An anti-frictional bearing which is reduced in its asynchronous rotational run out so that the cumbersome analyzing operation of the raceway surface and selecting operation of inner and/or outer races are not required. The bearing will contribute for the high packaging density and high speed operation of the hard disk device.Type: ApplicationFiled: October 6, 1999Publication date: February 14, 2002Applicant: Minebea Kabushiki - kaisha (Minebea Co., Ltd.)Inventors: HIROYUKI YAJIMA, HIDEKI MATSUOKA
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Patent number: 6246137Abstract: The object of the present invention is to provide a spindle motor of high accuracy of rotation irrespective of the temperature differential for driving the hard disk or disks of the hard disk drive device. A spindle motor including a shaft secured on a base to extend vertically therefrom, and a rotor hub journalled rotatably around the shaft through a plurality of anti-friction bearings each of which has outer and inner races and rotational bodies disposed between races, characterized in that a cylindrical sleeve having a through bore is disposed between outer peripheral surface of each anti-friction bearing and an inner peripheral surface of a central bore provided through the rotor hub, the sleeve and the outer races of the anti-friction bearings are made of the ferrous metal material of substantially the same coefficient of expansion, and the inner races of anti-friction bearings and the shaft are also made of the ferrous metal material of substantially the same coefficient of expansion.Type: GrantFiled: July 16, 1999Date of Patent: June 12, 2001Assignee: Minebea Kabushiki Kaisha (Minebea Co., Ltd.)Inventor: Rikuro Obara
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Patent number: 5952753Abstract: The object of the present invention is to provide a vibration-proof miniature motor of high endurance including a compact enough double row bearing apparatus having a shaft of sufficient mechanical rigidity.Type: GrantFiled: February 13, 1998Date of Patent: September 14, 1999Assignee: Minebea Kabushiki-Kaisha (Minebea Co., Ltd.)Inventor: Rikuro Obara
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Patent number: 5373784Abstract: In the type-wheel resetting mechanism for the downsized printer: a resetting cam portion (13) is provided in a drive gear (12) to save the number of components and to eliminate assembly and adjusting operations of the cam portion (13) and the drive gear (12); detected portions (25, 25a) for type selection and motor stop operations are provided separately from the drive gear (12); and, a sensor (26) for detecting the detected portions (25, 25a) is provided in the vicinity of the drive gear (12) to save the number of components, which simplifies the construction of the type-wheel resetting mechanism and improves the type-wheel resetting mechanism in reliability.Type: GrantFiled: December 17, 1993Date of Patent: December 20, 1994Assignee: Minebea Kabushiki-Kaisha (Minebea Co. Ltd.)Inventor: Atsushi Muraji
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Patent number: 5336955Abstract: In an outer-rotor type spindle motor: a front-end portion of a spindle (4) forming a stationary member passes through a central portion of a hub plate (7c) (onto which a disk (11) is loaded) of a rotor yoke (6) forming a rotating member; and, the front-end portion having been passed through the central portion of the hub plate (7a) of the rotor yoke (6) forms a head portion (4c) which is formed into a semispherical shape having been obliquely cut.Type: GrantFiled: December 18, 1992Date of Patent: August 9, 1994Assignee: Minebea Kabushiki-Kaisha (Minebea Co., Ltd.)Inventors: Yuzuru Suzuki, Sakae Fujitani, Masaaki Inagaki, Hitoshi Uchida
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Patent number: 5304879Abstract: In an outer rotor motor (1): a hub base (3) is in a center of an upper side of the motor (1); a chucking magnet (16) for carrying a disk is near the hub base (3); a spindle (4) is fixed to a central hole of a rotor yoke which is provided with a permanent magnet (15) in its outer peripheral portion; the spindle (4) is supported by a bearing (5) fixed to a boss (7b) of a bearing housing (7) in which a ring-like rib (7c) is concentrically formed around the boss (7b) to form a circumferential groove (7d) therebetween and a hub of a stator (8) is mounted on the rib (7c); a leaf spring (12) is over the groove (7d) of the bearing housing placed under the base (3); and a drive pin (10) is fixed to a free end of the spring (12) to extend upward from the base (3) due to its resiliency through a hole of the hub base (3).Type: GrantFiled: December 7, 1992Date of Patent: April 19, 1994Assignee: Minebea Kabushiki-Kaisha (Minebea Co., Ltd)Inventors: Yuzuru Suzuki, Sakae Fujitani, Masaaki Inagaki