Bearing Structure Patents (Class 369/269)
  • Patent number: 8773813
    Abstract: A disk drive device is provided with a recording disk, a base member, a bearing unit, and a hub member. In a marking step, unbalance information indicating the displacement of the center of gravity of the hub member with respect to the rotation center of the hub member is acquired, and an information mark containing the unbalance information is applied to at least the hub member or the base member. In an installing and adjustment step, the unbalance information is read form the information mark, and the position for installing the recording disk in an outer cylinder part is determined in accordance with the unbalance information so as to install the recording disk on the hub member.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: July 8, 2014
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Kazuyoshi Nagai, Hiroshi Iwai
  • Patent number: 8553518
    Abstract: A disc spindle provides removal of particulates generated by internal parts of mechanisms, including the disc clamping mechanism, air bearing rotor, and other moving parts provides a port that is coupled to a vacuum system to remove particulate from the areas in which they are generated. In other aspects of the invention, vacuum evacuation of rotary and other bearings in a mechanical system employed in a clean room environment are prevented from contaminating the environment by removing particulate at the locations in which it is generated by friction, contact, or other means such as being introduced from the pressure channel in an air bearing feed.
    Type: Grant
    Filed: June 13, 2012
    Date of Patent: October 8, 2013
    Inventor: Donald L. Ekhoff
  • Publication number: 20120008488
    Abstract: An improved turntable is described with inherent properties for reducing noise generated by external sources or by the parts of the turntable. The plinth of the turntable is comprised of an elastomeric layer and at least one stiffening layer that adds rigidity to the plinth. The support feet, spindle bearing, and armboard only come into contact with the elastomeric layer, which dampens energy, allowing the turntable produce the audio on the record without excessive noise.
    Type: Application
    Filed: January 4, 2011
    Publication date: January 12, 2012
    Applicant: Merrill Williams Audio, LLC
    Inventors: George Earnest Merrill, Robert Edwin Williams
  • Patent number: 7990813
    Abstract: An optical pickup device includes a hosing having three walls connected together whose horizontal cross-section is substantially U-shaped. A first wall supports one end of a shaft, a second wall facing the first wall supports the other end of the shaft and a third wall connects the first and second walls. A lubricant tray is surrounded by the three walls and the shaft. By the shaft being attached to an end side surface of the lubricant tray, the shaft can be integrally formed with the housing. A radius of curvature or an angle formed on a horizontal cross-section of the three walls is larger than a radius of curvature or an angle formed between one of the three walls and the lubricant tray.
    Type: Grant
    Filed: November 18, 2009
    Date of Patent: August 2, 2011
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Rika Nomura, Kazumi Takahashi, Seiichi Kato, Yasushi Kinoshita, Kazuhiro Todori
  • Patent number: 7856719
    Abstract: A typical dynamic bearing design comprises a ring shaped or circular thrust plate mounted at or near the end of a shaft, the shaft defining together with a surrounding sleeve a journal bearing by providing grooves on only one of the two surfaces facing the gap between the shaft and sleeve. On the ring shaped thrust plate supported by the shaft, the traditional upward thrust bearing defined between the lower face of the thrust plate and the facing surface of the sleeve is maintained; but no grooves are on the surface of the thrust plate distant from the shaft and a facing counterplate surface. Further, the journal bearing is defined to have an asymmetry so that a bias force pressure along the surface of the shaft toward the thrust plate is established.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: December 28, 2010
    Assignee: Seagate Technology LLC
    Inventor: Anthony Joseph Aiello
  • Publication number: 20080112306
    Abstract: In order to prevent oil leakage in a hydrodynamic bearing device comprising an opening section in close proximity to a radial bearing and a lubricating fluid reservoir, a shaft 10, thrust flange 16, sleeve 11, seal plate 21, and stopper plate 20 are provided, a radial dynamic pressure bearing is formed in a radial clearance between the shaft 10 and sleeve 11, and a thrust dynamic pressure bearing is formed in a thrust direction clearance between the sleeve 11 and thrust flange 16. A connecting hole 11d is formed that connects a gap between the sleeve 11 and seal plate 21 and a thrust direction gap between the sleeve 11 and thrust flange 16. The relationship A<B<C is satisfied, where A is a radial clearance, B is a clearance between an outer peripheral surface of the shaft 10 and an inner peripheral surface of the seal plate 21, and C is a clearance between a lower surface of the seal plate 21 and an upper end face of the sleeve 11.
    Type: Application
    Filed: November 14, 2007
    Publication date: May 15, 2008
    Inventors: Koji HIRATA, Hiroaki Saito, Takao Yoshitsugu, Hiroyuki Kiriyama
  • Patent number: 6951025
    Abstract: A gas dynamic pressure bearing is disclosed in which dynamic pressure generating grooves in a radial bearing pump out gas toward a thrust bearing, and dynamic pressure generating grooves in the thrust bearing pump in gas toward the radial bearings. This structure generates high pressure in the lubrication gas in the connecting portions of the radial bearings and thrust bearings. In order to compensate for the movement of gas by means of this pump-out and pump-in operation, a structure is provided that links the two portions of the radial and thrust bearings where the gas pressure is reduced, or connects these two portions with the space surrounding the bearing.
    Type: Grant
    Filed: March 12, 2003
    Date of Patent: September 27, 2005
    Assignee: Nidec Corporation
    Inventor: Takayuki Oe
  • Patent number: 6888278
    Abstract: Low-profile spindle motor whose entire shaft length is utilized to configure, along an encompassing sleeve, a radial dynamic-pressure bearing section. One end of the shaft is unitary with the rotor, and a cover member closes the other end. Between the sleeve upper-end face and the rotor undersurface a thrust bearing section is configured. Micro-gaps are formed continuing between the sleeve upper-end face and the rotor undersurface; the sleeve inner-circumferential surface and the shaft outer-circumferential surface; and the cover member inner face and the shaft end face, where an axial support section is established. Oil continuously fills the micro-gaps, configuring a full-fill hydrodynamic bearing structure. Hydrodynamic pressure-generating grooves in the radial bearing section are configured either so that no axial flow, or so that a unidirectional flow that recirculates from one to the other axial end of the radial bearing section through a communicating pathway is induced in the oil.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: May 3, 2005
    Assignee: Nidec Corporation
    Inventors: Hideki Nishimura, Yoshito Oku, Shinya Yano
  • Patent number: 6865744
    Abstract: A device for rotating inside of a disk player and/or recorder a disk shaped data carrier which takes into account that the rotating disk may be eccentered from an imposed rotation axis. A side moving apparatus allows the rotating disk and a fixing device to which the disk is removably fixed, to move inside the player and/or recorder in a rotation plane substantially perpendicular to an axis of rotation of the fixing device. The rotating disk and the fixing device go into a gyroscopic movement inside the player. A plurality of examples to realize the invention are described.
    Type: Grant
    Filed: November 19, 2001
    Date of Patent: March 8, 2005
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Klaus Oldermann, Heinz-Joerg Schroeder
  • Patent number: 6815850
    Abstract: A spindle design for a hard disk drive assembly constructed in accordance with the present invention includes a significantly large gap between the rotating, ferromagnetic hub with its permanent magnet rotor and the rotating sleeve of the fluid bearing journal member. The large gap may be filled with a medium, such as air, or a non-permeable material. The large gap is preferably on the order of several hundred microns. Because of the large gap, the magnetic flux leakage from the rotating hub members and sleeve into the stationary shaft at the center of the spindle is negligible. Consequently, iron loss in the shaft caused by magnetic flux leakage into the shaft is reduced to acceptable noise levels.
    Type: Grant
    Filed: July 10, 2001
    Date of Patent: November 9, 2004
    Assignee: International Business Machines Corporation
    Inventors: David W. Albrecht, Chen-hsiung Lee
  • Patent number: 6738340
    Abstract: The invention relates to a device in a deck for playing information discs (2), which preferably have been provided or can be provided with digital information, the information disc (2) being rotated, in the operating condition, about its center by a drive motor (5) and magnetically cooperating material parts (8, 9) being present, which are offset radially with respect to the axis of rotation (3) and in the direction thereof parallel with respect to one another and of which one part (8) is disposed on the base plate (4) which carries the motor (3) and of which the other part (9) is disposed on the disc support (1) which is moved by the motor shaft (6), one of the material parts (8, 9) being a ring-shaped permanent magnet, at least one of the two magnetically cooperating material parts (8, 9) being arranged eccentrically with respect to the axis of rotation (3) and both material parts (8, 9) are ring-shaped, the directions of the lines of field not being changed during rotation.
    Type: Grant
    Filed: October 2, 2001
    Date of Patent: May 18, 2004
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Christian Hopf, Norbert Kunze, Stefan Mueller, Horst Rumpf, Cornelius Wouters
  • Publication number: 20040081066
    Abstract: A turntable that has a platter that can be vertically positioned so that the VTA between the stylus of the cartridge and the record can be easily adjusted without tweaking or touching the tone arm. The turntable includes a base, a platter, a spindle assembly configured to position the platter above the base, and a spindle adjustment mechanism configured to selectively position the vertical position of the platter with respect to the base. In one embodiment, the spindle adjustment mechanism includes a drive shaft that is configured to engage the spindle assembly and to selectively drive the spindle assembly up or down. As the spindle assembly is moved up and down, the platter moves up and down with respect to the base. In another embodiment, the spindle assembly includes a spindle shaft configured to rotate inside a chamber of the spindle assembly. A bolt which attached to the spindle shaft is configured to move up and down when the spindle shaft is rotated.
    Type: Application
    Filed: October 29, 2002
    Publication date: April 29, 2004
    Inventor: Salvatore J. Calaio
  • Patent number: 6704272
    Abstract: A shaft which alternately stacks and holds disks and spacers is rotated by a motor having a rotor and stator. To prevent axial run-out during rotation, when the disks and spacers are fitted on the shaft, clean air is injected from an air pad to prevent eccentricity by a fluid film, and an aligning shaft is pressed against a hub on the upper end of the shaft via an air pad to attain alignment.
    Type: Grant
    Filed: September 26, 2000
    Date of Patent: March 9, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Hagiwara
  • Patent number: 6683843
    Abstract: A turntable driving device has a spindle motor 5, a bearing 7, and a wire spring 9. The spindle motor 5 has a rotation shaft 11 which is to be coupled to the turntable 3. The bearing 7 is placed on the lateral side of the rotation shaft 11, and has a pair of inclined faces 7a that are opened in the side of the rotation shaft 11 so as to sandwich the rotation shaft 11, and that are formed to be abuttable against the rotation shaft 11. The wire spring 9 is a member for urging the bearing 7 toward the rotation shaft 11.
    Type: Grant
    Filed: June 5, 2001
    Date of Patent: January 27, 2004
    Assignee: Funai Electric Co., Ltd.
    Inventors: Hideki Kume, Teruaki Sogawa, Takayuki Murakami
  • Publication number: 20030185141
    Abstract: In a mounting structure of a motor to a mounting base, the motor including a rotor having a rotation shaft for rotating a disc-shaped recording medium and a stator having a bearing portion for rotatably supporting the rotation shaft. The mounting base is provided with a shaft end receiving portion for restricting the downward movement of the rotation shaft. The mounting base is preferably a chassis provided in a disc drive and the motor is a spindle motor provided on the chassis for rotating an optical disc. The shaft end receiving portion includes a concave part integrally formed with the mounting base. According to this structure, there is no need to provide the stator with a structure for supporting one end of the rotation shaft, and this makes it possible to reduce the number of components forming the motor.
    Type: Application
    Filed: March 28, 2003
    Publication date: October 2, 2003
    Inventors: Toshinori Kurosaka, Takashi Watanabe, Mamoru Takahashi, Makoto Sato
  • Publication number: 20030174637
    Abstract: A spindle motor for a hard disk drive having a stationary component with a first bearing surface, and a rotating component with a second bearing surface located in opposing relationship with the first bearing surface. The first and the second bearing surfaces form a hydrodynamic bearing. A bearing gap is formed between the first bearing surface and the second bearing surface, the bearing gap being filled with lubricating fluid. An oil-free recess is provided in the motor for placement of electromagnetic components of the motor. The stationary component is provided with a first set of seal surfaces, and the rotating component is provided with a second set of seal surfaces. The seal surfaces of the first set are located opposite the seal surfaces of the second set and form a labyrinth seal sealing the bearing gap from the oil-free motor recess.
    Type: Application
    Filed: March 7, 2003
    Publication date: September 18, 2003
    Applicant: Minebea Co., Ltd.
    Inventors: Andreas Kull, Joerg Hoffman, Olaf Winterhalter
  • Patent number: 6574186
    Abstract: A conventional plain bearing, in which dynamic pressure is generated by means of lubricating oil, has been assembled in such a way that the whole bearing device is assembled and then the lubricating oil is poured in the interior. As a result, residual air bubbles are produced to cause lowering of the dynamic pressure. The present invention uses magnetic fluid as lubricating oil, and adopts, for enclosing the fluid, a method in which at the time of assembling a spindle motor, a permanent magnet is used, magnetic fluid of a specified amount is previously held in a bearing unit by the magnetic attraction force, and after the insertion of a shaft, the magnetic fluid is supplied into a narrow space of a bearing part by a capillary attraction.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: June 3, 2003
    Assignees: Hitachi, Ltd., Hitachi Powdered Metals co., Ltd.
    Inventors: Katsutoshi Nii, Toshikazu Takehana, Motohiro Miyasaka
  • Patent number: 6556536
    Abstract: A vacuum apparatus particularly suitable for disk recording systems has a rotatable shaft mounted on a support body by an air bearing, the air bearing being provided within a vacuum chamber. A second rotatable shaft extends through the wall of the vacuum chamber in which it is mounted by a second air bearing. The second shaft has a hollow center which communicates with an output of the air bearing for removal of air exhausting from the air bearing. The air bearing may be provided within a second chamber within the vacuum chamber and may be movable relative to the axis of the second shaft. In a disk recording system, the air bearing may support a turntable.
    Type: Grant
    Filed: November 29, 2000
    Date of Patent: April 29, 2003
    Assignee: Unaxis Nimbus Limited
    Inventors: Gerald Alfred John Reynolds, Jonathan Halliday
  • Patent number: 6552456
    Abstract: A hydraulic dynamic pressure bearing motor has a rotational shaft mounted to undergo rotation about a rotational axis and having a shaft section and a flange section. A sleeve has a cavity for receiving the rotational shaft. A cover member is disposed over an open end of the sleeve cavity. A hydraulic dynamic pressure bearing includes minute radial and thrust clearances disposed between outer surface portions of the shaft and flange sections of the rotational shaft and inner surface portions of the sleeve and the cover member. A lubricating fluid is disposed in the minute radial and thrust clearances. The minute radial and thrust clearances are dimensioned so that during a non-rotational state of the rotational shaft, the flange section of the rotational shaft contacts preselected inner surface portions of the sleeve and the cover member while the shaft section of the rotational shaft does not contact any portion of the sleeve and an inner peripheral surface of the cover member.
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: April 22, 2003
    Assignee: Seiko Instruments Inc.
    Inventors: Hiromitsu Goto, Shinji Kinoshita, Toru Kumagai, Yukihiro Nakayama, Chihiro Tazawa, Mitsuharu Iwamoto, Ryoji Yoneyama
  • Publication number: 20030031114
    Abstract: A spindle motor of small size, thin type, high reliability, and high performance suited to an information recording and reproducing apparatus is presented. Specifically, a rotary disk is composed by integrally forming a disk board, and a rotary shaft of spindle motor, and a bearing is composed by forming dynamic pressure generating grooves in the rotary shaft of the rotary disk. As a result, small size and thin structure are realized, surface deflection of the disk during rotation of the spindle motor, and its axial center deflection are substantially decreased, and moreover the recording density is enhanced, the number of constituent parts is curtailed, and the cost is saved.
    Type: Application
    Filed: July 16, 2002
    Publication date: February 13, 2003
    Inventors: Hiromitsu Noda, Shigeo Obata
  • Patent number: 6438094
    Abstract: The present invention relates to a device for reading from or writing to recording media in disc form which has an unbalance compensation means. The object of the invention is to propose a device of this type which has the smallest possible unbalance even when exchangeable recording media are used. This object is achieved according to the invention by virtue of the fact that the unbalance compensation means is a centrifugal force generation means which generates a centrifugal force which is variable during operation. According to another aspect of the present invention, provision is made for the unbalance compensation means to be a positioning means for positioning the recording medium. The field of application of the invention includes, inter alia, devices for reading from and/or writing to optical recording media such as CD, CD-ROM, DVD, DVD-ROM, DVD-RAM and the like.
    Type: Grant
    Filed: February 11, 1999
    Date of Patent: August 20, 2002
    Assignee: Thomson Licensing, S.A.
    Inventors: Peter Mahr, Klaus Oldermann
  • Patent number: 6366552
    Abstract: A device for rotating inside of a disk player and/or recorder a disk shaped data carrier which takes into account that the rotating disk may be eccentered from an imposed rotation axis. Side moving means allow the rotating disk and the fixing means to which the disk is removably fixed, to move inside said player and/or recorder in a rotation plane substantially perpendicular to an axis of rotation of said fixing means. The rotating disk and the fixing means go into a gyroscopic movement inside the player. A plurality of examples to realize the invention are described.
    Type: Grant
    Filed: May 13, 1999
    Date of Patent: April 2, 2002
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Klaus Oldermann, Heinz-Joerg Schroeder
  • Publication number: 20010048658
    Abstract: A turntable driving device has a spindle motor 5, a bearing 7, and a wire spring 9. The spindle motor 5 has a rotation shaft 11 which is to be coupled to the turntable 3. The bearing 7 is placed on the lateral side of the rotation shaft 11, and has a pair of inclined faces 7a that are opened in the side of the rotation shaft 11 so as to sandwich the rotation shaft 11, and that are formed to be abuttable against the rotation shaft 11. The wire spring 9 is a member for urging the bearing 7 toward the rotation shaft 11.
    Type: Application
    Filed: June 5, 2001
    Publication date: December 6, 2001
    Inventors: Hideki Kume, Teruaki Sogawa, Takayuki Murakami
  • Publication number: 20010040864
    Abstract: A recording disk has a surface provided with guide grooves for controlling the position of a recording head, and recording bits formed in the guide grooves for high-density recording. The recording bits have the shape of a tadpole in a plane. The width Ws of the recording bits is greater than the width Wg of the guide grooves. An AFM probe serving as a recording head travels along the guide grooves without running off the guide grooves. When a tip part of the AFM probe coincides with the recording bit, the tip part drops deep into the guide groove, whereby the recording bit is detected.
    Type: Application
    Filed: July 26, 2001
    Publication date: November 15, 2001
    Applicant: Hitachi, Ltd.
    Inventors: Sumio Hosaka, Hajime Koyanagi, Atsushi Kikukawa, Kenchi Ito, Kimitoshi Etoh
  • Publication number: 20010002898
    Abstract: A conventional plain bearing, in which dynamic pressure is generated by means of lubricating oil, has been assembled in such a way that the whole bearing device is assembled and then the lubricating oil is poured in the interior. As a result, residual air bubbles are produced to cause lowering of the dynamic pressure. The present invention uses magnetic fluid as lubricating oil, and adopts, for enclosing the fluid, a method in which at the time of assembling a spindle motor, a permanent magnet is used, magnetic fluid of a specified amount is previously held in a bearing unit by the magnetic attraction force, and after the insertion of a shaft, the magnetic fluid is supplied into a narrow space of a bearing part by a capillary attraction.
    Type: Application
    Filed: November 30, 2000
    Publication date: June 7, 2001
    Inventors: Katsutoshi Nii, Toshikazu Takehana, Motohiro Miyasaka
  • Publication number: 20010002188
    Abstract: A bearing (4) is mounted on a base (1) to retain a portion of the shaft (6) ranging from near a lower end portion to near an upper end portion, and a rotor housing (10) is provided with a rotor base (11) disposed at a level lower than that of an optical pickup (13) with a magnet (9) being provided on an inner peripheral surface, and a rotor boss (12) formed separately from the rotor base (11). The rotor boss (12) has a smaller outer radius than the outer radius of the rotor base (11) and is fixed on the rotor base (11) so that a side face is opposite to a side face of the optical pickup (13). Thus, it is possible to prevent run-out of the shaft (6) and to downsize the device with a simple structure. Furthermore, it is possible to use components 1, 2, 5, 9, 11 and the like in common with thin motors used with other types of device and thus manufacturing costs are greatly reduced.
    Type: Application
    Filed: January 3, 2001
    Publication date: May 31, 2001
    Inventors: Kiichiro Murotani, Atsushi Michimori, Takeshi Inatani, Masaaki Takeshima
  • Patent number: 6219328
    Abstract: A disc rotating apparatus includes a turntable for placing thereon a disc such as CD, DVD. The disc is clamped by the turntable and the disc holding frame. The holding frame is formed, at its main body, with an annular groove. The annular groove is circumferentially partitioned by a plurality of partition walls to thereby provide a plurality of accommodating portions. Each of the accommodating portions accommodates therein one or two or more steel balls. Due to rotation of the turntable or disc, each steel ball is displaced within the accommodating portion, thereby correcting for an unbalanced state wherein a center of gravity of the disc is deviated from an axis of a rotary shaft of turntable.
    Type: Grant
    Filed: November 2, 1998
    Date of Patent: April 17, 2001
    Assignee: Funai Electric Co., Ltd.
    Inventors: Hideki Kume, Toshiharu Hibi, Teruaki Sogawa
  • Patent number: 6175547
    Abstract: A positive and negative rotation gas dynamic pressure bearing comprises a stationary bearing member, a movable bearing member mounted for rotation relative to the stationary bearing member, dynamic pressure generating grooves having first and second ends and formed in one of confronting surfaces of the stationary bearing member and the movable bearing member, a self-switch valve connected to the movable bearing member for rotation therewith, and conducting holes having first and second ends and formed in the movable bearing member. During rotation of the movable bearing member in a first direction of rotation, a high dynamic pressure is generated at central portions of the dynamic pressure generating grooves, and a valve body of the self-switch valve moves toward a lower space of a valve case of the self-switch valve to close the second ends of the conducting holes.
    Type: Grant
    Filed: September 28, 1998
    Date of Patent: January 16, 2001
    Assignee: Seiko Instruments Inc.
    Inventor: Toshiharu Kogure
  • Patent number: 5947607
    Abstract: A fluid bearing in which a thrust bearing is mounted at both ends of a rotary shaft to minimize movement and oscillation of the rotary shaft regardless of a thrust load. The fluid bearing apparatus includes a pair of sleeves respectively mounted into one end of a pair of bearing brackets, a rotary shaft inserted into through holes of the respective sleeves, having a second kinetic pressure generating groove on a circumferential side opposite to the inside of the respective through holes, a pair of thrust bearings mounted into the other end of the bearing brackets, and a first kinetic pressure generating groove formed between any one of the thrust bearings and a section of the rotary shaft.
    Type: Grant
    Filed: November 19, 1997
    Date of Patent: September 7, 1999
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Chang-woo Lee
  • Patent number: 5945751
    Abstract: The invention relates to a spindle driving motor, in particular an external rotor motor, the main components of which are accommodated in the interior of a driving hub (4) or the back iron (5). According to the invention, in order to minimize the number of joints, both ball bearings (11, 12) are arranged directly, yet correctly as far as assembly is concerned, between the fixed shaft (10) and the back iron (5), a collar (15) having a larger diameter serving in particular to this end.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 31, 1999
    Assignee: Papst Licensing GmbH
    Inventors: Helmut Hans, Jurgen Oelsch
  • Patent number: 5796707
    Abstract: According to the present invention, an optical recording and reproducing apparatus includes a deck, a spindle motor installed on the deck, a turn table attached to the shaft of the spindle motor, and a method for correcting the installation angle of the spindle motor in order to correct the tilt angle of the turn table. According to the present invention, the tilt angle of the optical axis can be easily corrected, thereby improving the performance of the apparatus.
    Type: Grant
    Filed: October 9, 1996
    Date of Patent: August 18, 1998
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Seung-min Kim
  • Patent number: 5796548
    Abstract: A disk storage drive is provided with a brushless drive motor having a stator with a winding. An external rotor housing including a permanent magnet coaxially surrounds the stator and is spaced therefrom by a substantially cylindrical air gap. A hub is provided that is concentric to the rotor housing and is connected to the rotor housing for rotation therewith. A bearing above the stator rotatably supports an upper end of the rotor housing on a stationary shaft and a bearing below the stator braces the open end of the rotor housing by a ring element having substantially the same heat expansion characteristics as the rotor housing.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 18, 1998
    Assignee: Papst Licensing GmbH
    Inventors: Helmut Hans, Jurgen Oelsch
  • Patent number: 5594606
    Abstract: A disk storage drive is provided with a brushless drive motor having a stator (34) with a winding. An external rotor housing (32) including a permanent magnet (33) coaxially surrounds the stator and is spaced therefrom by a substantially cylindrical air gap. A hub (31) is provided that is concentric to the rotor housing (32) and is connected to the rotor housing for rotation therewith. A bearing (47) above the stator rotatably supports an upper end of the rotor housing on a stationary shaft (46) and a bearing (37) below the stator braces the open end of the rotor housing by a ring element (35) having substantially the same heat expansion characteristics as the rotor housing (32).
    Type: Grant
    Filed: February 17, 1995
    Date of Patent: January 14, 1997
    Assignee: Papst Licensing GmbH
    Inventors: Helmut Hans, Jurgen Oelsch
  • Patent number: 5394284
    Abstract: The instability of a cage in a precision ball bearing at high speeds may be eliminated by controlling the position of the cage. The control of a position of a cage is accomplished by forming three ball pockets or holes in the cage for the balls of the ball bearing assembly to a dimension that will result in a tight running fit between the ball and the ball pocket. A tight running fit between the ball and the cage is found in three of the ball pockets in a ball bearing assembly while the diameter of the large ball pockets or other remaining ball pockets is enlarged to provide a clearance between the balls and the cage which is at least twice the clearance between the ball and the guide ball pocket having the tight running fit, and preferably three to five times that clearance. When properly lubricated, the tight running fit will insure stabilization and control of the cage so that the cage remains stable at high rotational speeds.
    Type: Grant
    Filed: October 9, 1992
    Date of Patent: February 28, 1995
    Assignee: International Business Machines Corp.
    Inventors: Glenn A. Benson, Peter M. Herman, Richard W. Luoma
  • Patent number: 5357500
    Abstract: A pickup feeding apparatus is comprised of a first rack provided on a pickup supporting member supported so as to become movable along a guide shaft, a second rack provided slidably relative to the first rack, a drive force transmitting gear for transmitting a driving force of a driving source to the first and second racks, a spring member for spring-biasing one of the first and second racks to the other along the guide shaft of the first and second racks in such a direction that gear teeth of a gear of the drive force transmitting means which are meshed with the first and second racks are gripped. A disc player is also disclosed, in which a disc drive motor and a pickup feeding motor are provided on the same chassis and the disc drive motor is located on the chassis at the position above the pickup moving locus fed by the pickup feeding device.
    Type: Grant
    Filed: February 17, 1994
    Date of Patent: October 18, 1994
    Assignee: Sony Corporation
    Inventor: Tetsu Yanagisawa
  • Patent number: 5331483
    Abstract: An axial compact direct drive for a storage disk comprises a stator, a rotor carrying a hub for receiving storage disks and a bearing arrangement. The bearing arrangement is disposed at a radially external edge of the hub to rotatably support the hub against axial and radial movement. The rotor is electrically driven at locations in the center of the stator or at locations surrounding the stator.
    Type: Grant
    Filed: July 1, 1992
    Date of Patent: July 19, 1994
    Assignee: PAPST Licensing GmbH
    Inventors: Uwe Muller, Michael Hermann
  • Patent number: 5300849
    Abstract: A device for eliminating the radial and axial play of a shaft having a circular ferromagnetic plate mounted thereon and which passes through a ferromagnetic stationary fitting. The device also includes a permanent magnet for establishing attractive forces within the device. A ferromagnetic arcuate part has a radius of curvature slightly larger than the radius of curvature of the circular ferromagnetic plate. The arcuate part is arranged in the proximity of the edge of the circular ferromagnetic plate whereby a first magnetic force acts between the arcuate part and the edge of the plate to eliminate the radial play and a second magnetic force acts between the shaft and the plate to eliminate the axial play.
    Type: Grant
    Filed: August 11, 1992
    Date of Patent: April 5, 1994
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventor: Axel Elsasser
  • Patent number: 5202797
    Abstract: A disk drive device is disclosed including a supporting mechanism for supporting a plurality of magnetic disks, a single motor, and a transmitting mechanism. The supporting mechanism comprises a plurality of bearing mechanisms, each of which rotatably supports each of the magnetic disks, respectively. Each bearing mechanisms is formed as a tube, and a rotatable shaft is connected to each disk and rotatably supported in each tubular bearing mechanism. The rotatable shaft is provided with grooves which generate a pumping effect when a fluid is passed therethrough, whereby the rotatable shaft is supported in the tubular bearing mechanism without friction therebetween. The transmitting mechanism comprises an endless belt for transmitting a rotation of the motor to the supporting mechanism.
    Type: Grant
    Filed: September 18, 1990
    Date of Patent: April 13, 1993
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Yuichi Kurosawa
  • Patent number: 5101399
    Abstract: Deck bases of conventional disk memory reproduction devices are fastened at four points by side lock pins protruding from the front and rear of the deck base and the side lock plates located opposite the side lock pins. This invention reduces the parts count and makes the deck base more compact by fixing the deck base at three points using side lock pins and side lock plates placed opposite them.
    Type: Grant
    Filed: October 4, 1988
    Date of Patent: March 31, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hidetaka Watanabe, Kanji Fukunaga
  • Patent number: 5045738
    Abstract: A spindle motor having a shaft member secured to a fitting member, a rotary member which is rotatable relatively to the shaft member, a rotor magnet fitted to the rotary member in such a manner that the rotor magnet confronts the rotor magnet and a stator, wherein a pair of inner annular grooves are formed in the shaft member, a pair of outer annular grooves are formed in the rotary member and a plurality of ball members are accommodated in ball-accommodating space defined by these annular grooves.
    Type: Grant
    Filed: February 15, 1990
    Date of Patent: September 3, 1991
    Assignee: Nippon Densan Corporation
    Inventors: Noriaki Hishida, Kuniyasu Iwazaki
  • Patent number: 5001700
    Abstract: Apparatus for centering and clamping a disk on a spindle-drive is disclosed. A bistable magnetic clamp normally held in an axially offset position from the plane of the disk is preferentially drawn to a coupler washer on the spindle-drive when the spindle-drive and clamping device are relatively moved toward each other after the disk is inserted into the drive. To accommodate significant initial misalignment of the disk, as might typically occur with a cartridge mounted disk, in a very short throw clamping motion, a multi-frustrum centering member is used. The frustrum surface nearest the disk has a gradual slope assuring meshing of the centering member with the central aperture of the disk over a wide range of initial misalignment. Once the disk is coarsely centered, precision centering is achieved during the final clamping stage by the second frustrum surface which is at steep slope relative to the plane of the disk.
    Type: Grant
    Filed: March 30, 1989
    Date of Patent: March 19, 1991
    Assignee: Literal Corporation
    Inventors: David L. Rowden, Patrick J. Champagne, Gary R. Clauson
  • Patent number: 4792938
    Abstract: A low-noise (low "rumble") segmented bearing for high-fidelity phonograph turntables and the like. In a preferred belt-driven form, the bearing consists of four small, spaced polyurethane pads disposed so that the tension of the belt keeps the shaft in contact with all of them. A fifth pad supports the end of the shaft. The bearing is immersed in lubricant.
    Type: Grant
    Filed: August 3, 1987
    Date of Patent: December 20, 1988
    Inventor: William H. Firebaugh
  • Patent number: 4509160
    Abstract: A disc drive assembly in which an air bearing supports the drive spindle in a manner centering the drive spindle to provide extremely close track spacing and a transducer assembly characterized by an air bearing therebeneath and a suction serving to draw the transducer assembly closely to the disc surface against the air bearing.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: April 2, 1985
    Inventor: Fred S. Eggers
  • Patent number: 4444069
    Abstract: A play-free precision drive apparatus is disclosed which comprises a rotatable drive element (2, 20) for driving a driven element (8, 21), a biasing element (12, 26) for urging the driven element (8, 21) into engagement with the drive element (2, 20), and two rotatable support elements (11, 22) abutting the drive element (2, 20) along its periphery for holding the drive element (2, 20) against the driven element (8, 21). The support elements (11, 22) are positioned such that the centers of the support elements (11, 22) and the center of the drive element (2, 20) define an angle (A.sub.1, A.sub.21) of less than 180.degree. having its apex at the center of the drive element (2, 20) and such that the centers of the support elements (11, 22) define a line (L.sub.3, L.sub.23) parallel to a tangent to the drive element (2, 20) which passes through a contact point between the drive element (2, 20) and the driven element (8, 21).
    Type: Grant
    Filed: February 9, 1981
    Date of Patent: April 24, 1984
    Assignee: Dr. Johannes Heidenhain GmbH
    Inventor: Holmer Dangschat
  • Patent number: 4442516
    Abstract: A reading device drive mechanism for a video disk player including a chassis, a pair of guide rails mounted parallel to one another on the chassis, a slider contacting corresponding sides of the guide rails through bearings, and a retainer for restricting deviation of the bearings supported and engaged with the guide rails with a retainer being slidable in the longitudinal direction of the guide rails. The retainer has windows formed therein through which the bearings are insertable with a lower edge portions of the windows being formed with a resiliency so that the bearings can be detachably mounted in corresponding ones of the windows.
    Type: Grant
    Filed: June 1, 1981
    Date of Patent: April 10, 1984
    Assignee: Universal Pioneer Corporation
    Inventor: Tadashi Funabashi
  • Patent number: 4439851
    Abstract: According to the present invention, a turntable lifting apparatus of a video disc player comprises: (1) a turntable for supporting a video disc; (2) a chassis attached to said player in parallel with and under said turntable; (3) a bearing attached to said chassis for supporting a shaft of said turntable; (4) a turntable lifter slidably attached to said chassis and parallel to said chassis, which has an inclined slotted plate in its intermediate portion which engages the end portion of said turntable shaft for lifting said turntable.
    Type: Grant
    Filed: July 6, 1981
    Date of Patent: March 27, 1984
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Majime Kiguchi
  • Patent number: 4432086
    Abstract: A turntable secured to a bearing member is freely rotatable about a support post. The bearing member has radial slots through which the fingers of a segmented spindle protrude. The spindle is axially slidable on the post. A spring is disposed about the post for urging the spindle upward for engagement with the record center hole as a record is placed on the turntable.
    Type: Grant
    Filed: May 3, 1982
    Date of Patent: February 14, 1984
    Assignee: RCA Corporation
    Inventor: Larry M. Hughes
  • Patent number: 4371220
    Abstract: A self-lubricating plain bearing for a shaft has a bore in which a bearing sleeve is disposed for rotatably supporting the shaft. Disposed in the bore in a portion thereof which is further inward than the sleeve is a lubricant-impregnated porous member. The clearance between the shaft and the inside surface of the member is larger than the bearing clearance between the shaft and the bearing sleeve and lubricant is drawn by capillary action from the member into the clearance and then into the bearing clearance.
    Type: Grant
    Filed: January 13, 1981
    Date of Patent: February 1, 1983
    Inventor: Egon Brucher
  • Patent number: 4339814
    Abstract: A spindle assembly is provided for rotatably supporting and driving a video information disc in a video recorder-playback machine. The spindle assembly comprises a vertically extending journal having a generally truncated conical shape and supported for rotation in an inverted position within a complementary shaped spindle housing. Pressurized air is supplied through a plurality of slotted flow paths to the support interface between the journal and the spindle housing for supporting the journal for relatively high speed rotation on a cushion of air.
    Type: Grant
    Filed: October 20, 1980
    Date of Patent: July 13, 1982
    Assignee: Discovision Associates
    Inventor: Lawrence S. Canino
  • Patent number: RE37455
    Abstract: An axial compact direct drive for a storage disk comprises a stator, a rotor carrying a hub for receiving storage disks and a bearing arrangement. The bearing arrangement is disposed at a radially external edge of the hub to rotatably support the hub against axial and radial movement. The rotor is electrically driven at locations in the center of the stator or at locations surrounding the stator.
    Type: Grant
    Filed: July 19, 1996
    Date of Patent: November 27, 2001
    Assignee: PAPST Licensing GmbH
    Inventors: Uwe Müller, Michael Hermann