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| Number | Title | Issue Date |
| 7361456 | Method of manufacturing master disk, apparatus of manufacturing master disk, method of detecting moving distance difference of master disk, and apparatus of detecting moving distance difference of master disk A method is provided for manufacturing a master disk in which there is precise feeding accuracy of the master disk by using a horizontally moving device which moves with curvature. The method of manufacturing a master disk includes the steps of rotating a resist mas... | 04/22/2008 |
| 7243360 | Method for reducing the altitudinal errors and run-out of a spindle motor and a slim-type spindle motor A method for reducing the altitudinal errors and run-out of a spindle motor is disclosed. The method includes the following steps. First is to mount a material layer on the loading surface. Then, a surface treatment is applied to the material layer until the average... | 07/10/2007 |
| 7233554 | Disk drive system employing effective disk surface stabilization mechanism A stabilization part stabilizes surface vibration of a flexible optical disk along a rotation axis direction of the optical disk by means of pressure difference of air flow created according to Bernoulli's law at a portion on which information writing/reading is per... | 06/19/2007 |
| 7123573 | Method for reducing the rotation speed of an automatic ball balancing system of an optical disk reading device An automatic ball balancing system for an optical disk reading device has a rotor mechanism that has a concave annular track formed on the rotor, with at least one ball placed on the annular track to perform automatic balancing. A surface with a low friction coeffic... | 10/17/2006 |
| 7112904 | Magnetic rotation transmitting device, hermetic stirring unit, and electric furnace In order to provide a magnetic rotation transmitting device capable of obtaining a large transmitting torque without using a large-sized permanent magnet, in an axial-type magnetic rotation transmitting device, which includes a driving rotation body having one or pl... | 09/26/2006 |
| 7105338 | Motorized turntable for petri dish Improvements to turntables that facilitate inoculation of petri dishes. In one embodiment, the present invention is a motorized turntable for a petri dish that allows the user to use both hands for inoculation of the petri dish. In another embodiment, the present in... | 09/12/2006 |
| 7089573 | Information recording/reading apparatus An information recording and/or reading apparatus has a base plate, a spindle motor for rotating a disk by the output shaft perpendicular to the base plate, a rotary alignment control device for determining the rotation position of a recording/reading head of a head... | 08/08/2006 |
| 7067943 | Resin-molded stator, a method of manufacturing the same, and a rotary machine using the same A highly reliable resin-molded stator not suffering insulation breakdown between different phases of stator coils even when the operation mode is repeated where the output of a rotary machine using a resin-molded stator is to be increased from the level under a stop... | 06/27/2006 |
| 7046590 | Objective lens drive device, and disk recording and/or reproducing device The present invention is directed to an object lens drive device adapted for moving an object lens (21) in a focus direction of optical axis direction and in a tracking direction perpendicular to the optical axis direction, and comprises a fixed portion (1... | 05/16/2006 |
| 7019423 | Brushless DC motor with tray coupling structure A brushless DC motor includes a fixed portion and a rotor. The rotor includes a shaft and a top engaging face. The shaft is rotatably held by the fixed portion. The top engaging face is located on a top side of the rotor. The rotor further includes at least one prot... | 03/28/2006 |
| 6980492 | Magnetically suspended CD-ROM drive A magnetically suspended CD-ROM drive is proposed, which is characterized by using electromagnetic attraction/repulsion force to move a disc-holding support tray for loading or ejecting a compact disc into or out of the CD-ROM drive. Without employing a gear mechani... | 12/27/2005 |
| 6966232 | Torque sensor In a torque sensor having a magnetic metal film with magnetic anisotropy attached to a torque transmission shaft and an exciting coil and a detector coil each installed near the magnetic metal film, there is provided a reference voltage generator that supplies an ac... | 11/22/2005 |
| 6917171 | Control device and method of stopping spindle motor of an optical disc system A control device and a method of stopping the spindle motor or an optical disc system. The control device primarily includes an optical disc control chip, a motor driving circuit and a spindle motor. The optical disc control chip generates and delivers a spindle mot... | 07/12/2005 |
| 6836460 | Disk drivingly rotating device with centering mechanism This invention provides a disc driving device used for rotationally driving a disc-shaped recording medium, comprising: a motor (3) in which a rotary shaft (2) attached to a rotor housed in a case (1) is provided to protrude from the case; and a... | 12/28/2004 |
| 6815850 | Flux leakage barrier in fluid bearing for disk drive 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 membe... | 11/09/2004 |
| 6556536 | Vacuum apparatus 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 ... | 04/29/2003 |
| 6532204 | Damped turntable/disk arculately positionable relative to a head A disk recording system for disks such as videod isks or compact disks has a turntable on which the disk is supported adjacent a recording head. A shaft defining the axis of rotation of the turntable rotates in a bearing and that bearing is itself movable... | 03/11/2003 |
| 6510122 | Disk drive device Disk storage devices have exhibited an increase in rotational vibrations which attend high speed rotation due to weight unbalance of a disk. Accordingly, an unbalance correcting mechanism, provided with correcting balls to correct the aforesaid unbalance,... | 01/21/2003 |
| 6492750 | Automatic equalizer A cylindrical case provided with a chamber is coaxially attached to a rotary shaft of a motor. A plurality of balancers are movably provided within the chamber so as to cancel a rotation eccentricity of the motor. A viscous member such as high viscosity f... | 12/10/2002 |
| 6459668 | Disk type reproducing apparatus and revolution control method The number of revolutions of a disk is once increased to a higher level than a resonance frequency of a rotation support system at the startup of rotation of the disk, and subsequently servo control for a pickup actuator is made to work to read informatio... | 10/01/2002 |
| 6424613 | Iron core coil motor and disk drive There is provided an iron core coil motor using an iron core coil, as a stator coil, formed by winding a coil winding around an iron core. Floating in the shaft direction of rotor is prevented with an attracting force generated by offsetting the center of... | 07/23/2002 |
| 6333912 | Self-compensating dynamic ball balancer for disk player In a self-compensating dynamic ball balancer for a disk player including a deck plate, a spindle motor is installed at the deck plate for providing a rotational force to a disk. A turntable is installed at a rotation shaft of the spindle motor for accommo... | 12/25/2001 |
| 6304543 | Disk apparatus with vertically arranged optical head and rotor magnet accommodating portion In a rotor unit of a disk supporting and rotating means, a disk support portion and a rotor accommodating portion project from a pole-shaped portion that extends along the disk rotation axis. When an optical head is moved so that its lens portion is oppos... | 10/16/2001 |
| 6256289 | Storage media driving motor with rotor magnet position determiner and balancing objects A storage media driving motor having a shaft, a turntable jointly rotatable with a replaceable storage media mounted on the shaft, a rotor yoke rotating jointly with the turntable, a stator including a core and a winding wound around the core, and a drivi... | 07/03/2001 |
| 6249505 | Disk drive motor The present invention discloses a disk drive motor comprising a rotor having an annular space formed therein coaxially with the axis of rotation, and balancing member accommodated in the annular space and capable of changing its mass distribution circumfe... | 06/19/2001 |
| 6205110 | Disk drive motor The present invention discloses a disk drive motor comprising a rotor having an annular space formed therein coaxially with the axis of rotation, and balancing member accommodated in the annular space and capable of changing its mass distribution circumfe... | 03/20/2001 |
| 6181671 | Spindle motor and its manufacturing method To improve the accuracy in holding a disc and to reduce unwanted vibration occurring when the disc is rotated at a high speed (the whirling of a turn table and a rotor), a spindle motor for rotating a disc comprises a turn table (3) that holds a disc (1) ... | 01/30/2001 |
| 6128268 | Driving mechanism for a record player A driving mechanism for a record player includes a fixing base, a solenoid, a housing, a spindle, a sleeve, a turntable and a magnetic ring. The solenoid is fixed on the fixing base for rotating the housing. The spindle is located in the center of the hou... | 10/03/2000 |
| 6125098 | Disk drive motor The present invention discloses a disk drive motor comprising a rotary member having an annular space formed therein coaxially with the axis of rotation, and ring-shaped balancing members accommodated in the annular space and capable of changing its mass ... | 09/26/2000 |
| 6078467 | Magnetic recording apparatus having medium driving motor with reduced thickness utilizing press working, press forming or the like A radial gap type medium driving motor for rotating a recording medium has first coil units having first windings of a first number of layers and second coil units having second windings of a second number of layers that is larger than the first number of... | 06/20/2000 |
| 6049520 | Drive mechanism for rotating storage media A drive mechanism in a data storage apparatus for positioning and rotating a two-sided data storage medium. The drive mechanism includes at least one repeller adjacent each side of the data storage medium repelling at least one control element on the data... | 04/11/2000 |
| 6038205 | Spindle motor A spindle motor comprises a fixed journal, a hub for loading disks, a ball bearing for rotatably supporting the hub and an annular member fixed on one of the fixed journal and the hub. The fixed annular member is configured to create to create a small spa... | 03/14/2000 |
| 6021885 | Rotary drive device with axially movable receptacle A rotary drive device for a flat object which is transported by a conveyance means to a processing station. At the processing station the object is rotated about an axis orthogonal to its surface extension by the rotary drive device. The rotary drive devi... | 02/08/2000 |
| 5798999 | Damped turntable/disk arculately positionable relative to a head A disk recording system for disks such as videodisks or compact disks has a turntable on which the disk is supported adjacent a recording head. A shaft defining the axis of rotation of the turntable rotates in a bearing and that bearing is itself movable ... | 08/25/1998 |
| 5742450 | Disk drive spindle motor with radial gap and field generating coils interconnected by ring flux guide A brushless permanent magnet DC motor for use as a disk drive spindle motor has a radial working gap but uses flat coils that generate magnetic fields that interact with the permanent magnet fields across the radial gap. The stator includes a plurality of... | 04/21/1998 |
| 5600624 | Apparatus for rotating an optical disk including an air bearing turntable An optical disk system comprising a turntable (56) adapted for contact with a CD-disk (6) and having a motor-driven shaft. The system includes an optical unit (10) for projecting a laser beam onto the surface of the CD-disk and detecting laser light refle... | 02/04/1997 |
| 5572505 | Spring starter for a hard disk drive platter assembly A self-winding spring starter for rotating data storage devices. The spring is fixed on one end to a chassis or a cowling. The spring selectively engages the rotating assembly at its other end via a clutch when the rotating assembly is being stopped. The ... | 11/05/1996 |
| 5463613 | Motor drive unit for a record player A drive for the turntable of an analogue record player has an output shaft for rotating the turntable via an endless belt extending around the output shaft and the periphery of the turntable. A disc rotatably supported in line with and connected to the ou... | 10/31/1995 |
| 5453973 | Disc driving device for storage disc The specification discloses a disc driving device having a spindle motor for driving a storage disc with a hub mounted on a spindle of the spindle motor in a sealed housing. The spindle motor comprises the spindle, a stator frame for supporting the spindl... | 09/26/1995 |
| 5448549 | Process for stopping a rotating disc-shaped record medium Process for stopping a record-shaped, rotating information medium, for example, a CD. CD-players, for example, are provided with a loading and unloading mechanism for the information medium, the CD. However, before a CD can be automatically unloaded by th... | 09/05/1995 |
