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| Number | Title | Issue Date |
| 7302982 | Label applicator and system A label applicator including a support surface having a central area and curving downwardly from the central area. A post assembly extends up from the central area such that a label having a label through-hole can be positioned in a support position generally on the... | 12/04/2007 |
| 7280454 | Method and system for identifying the size of an optical disc A method for identifying the size of an optical disc includes the steps of driving a motor at a specified rotary torque for rotating the optical disc, measuring angular acceleration of the optical disc, and comparing the measured angular acceleration with a referenc... | 10/09/2007 |
| 7277373 | Optical disc apparatus In an optical disc apparatus reading and writing data with respect to an optical disc, a motor controller uses widest pattern signals outputted from an optical pickup for judging size of an optical disc mounted on a turn table and stop of rotation of the optical dis... | 10/02/2007 |
| 7257062 | Method for detecting eccentricity of an optical disc, and optical disc drive that performs the method An optical disc drive includes a spindle motor and a computer program. The spindle motor is adapted for rotating an optical disc. The computer program configures the optical disc drive to perform consecutive steps of a method for detecting eccentricity of the optica... | 08/14/2007 |
| 7233552 | Optical disk device capable of recording information data according to ZCLV format An optical disk device for recording data in an optical disk under ZCLV control is provided. The optical disk device divides the optical disk into a plurality of zones, and drives said optical disk at a linear velocity fixed in each zone but varied among the zones. ... | 06/19/2007 |
| 7095689 | Method and device for controlling the rotating speed of a spindle of an optical disk drive through a wobble signal, an EEFS signal and an ESFS signal A method and device for controlling a rotation speed of a spindle of an optical disk drive includes a frequency detector, two phase detectors, a frequency divider, a low pass filter, a switch circuit, and a drive circuit. The method uses a wobble signal, an encoder ... | 08/22/2006 |
| 6917577 | Method for determining position of optic pick-up head and device of the same A method for determining the position of an optic pick-up head and the device of the same are disclosed. The number of frames in certain section of the disk are used to determine the position of the optic pick-up head. The number of frames in inner section of the co... | 07/12/2005 |
| 6526005 | Disc-like record carrier with information track containing control information including disc diameter A disc-like record carrier has a machine-readable information track in which is provided record carrier control information including the actual physical diameter of the carrier.... | 02/25/2003 |
| 6388962 | Disc-like record carrier, recording and/or reading apparatus for recording/reading information in the record carrier A disc-like record carrier (1) has control information recorded. The control information comprises diameter information which is indicative of the diameter of the record carrier. An information recording and/or reading apparatus involves a drive structure... | 05/14/2002 |
| 6222336 | Rotational vibration detection using spindle motor velocity sense coils An apparatus and method for detecting rotational vibration applied to a disc drive having an actuator supporting a head adjacent a rotatable disc. A spindle motor has a set of driver coils which rotate the disc through electrical commutation, and a set of... | 04/24/2001 |
| 6131138 | Variable speed compact disc drive including an elastic buffer The present invention provides an improved disc drive. In one embodiment of the present invention a disc drive capable of spinning a disc, which contains more than one type of data is disclosed. A first type of data is associated with a first speed, and a... | 10/10/2000 |
| 5998947 | Method capable of surely chucking a FD inserted in a high-density type FDD In a method of starting rotation of a magnetic disk medium of a large-capacity flexible disk by a spindle motor for use in a high-density type flexible disk drive for carrying out data recording and reproducing operation to and from the magnetic disk medi... | 12/07/1999 |
| 5898283 | Voltage feedforward control system for a spindle motor of a disk drive A spindle motor of a disk drive is controlled in a switched voltage mode. A power bus supplies a voltage to the spindle motor. The power bus voltage is subject to variations while the spindle motor is being driven. An uncompensated motor voltage signal is... | 04/27/1999 |
| 5877623 | Method for measuring recording linear velocity of data on compact disk A method is disclosed for measuring the linear velocity of recording of data recorded a CD using a Hall sensor. A Hall sensor is placed in the spindle motor of a CD drive to produce a signal based on alternating magnetic flux in the spindle motor. An ampl... | 03/02/1999 |
| 5808978 | Speed control of optical information reproduction apparatus A method for controlling speed of a spindle motor within a disk player is provided. The spindle motor drives a disk thereon and the disk player includes a pickup and a control circuit for performing focus and tracking operation of the pickup. The first st... | 09/15/1998 |
| 5729652 | System for controlling the speed of a motor driven by an unregulated voltage A method for controlling the speed of a motor driven by an unregulated voltage supply is disclosed. The disclosed method comprises obtaining a ripple signal (VR) representative of the ripple component of the supply voltage, and modulating the m... | 03/17/1998 |
| 5644561 | Method of discerning disc in compact disc drive A method of discerning an optical disk in a compact disk drive which includes the steps of moving an optical pick-up device to a table of contents (TOC) region of an optical disk to perform a focusing operation for reading data from the optical disk, and ... | 07/01/1997 |
| 5621288 | Motor speed regulating circuit with starter and storage medium drive using the same A motor speed regulating circuit includes a speed signal generator for generating a speed signal having a frequency proportional to the speed of the motor, synchronously with the rotation of the motor. A time difference detector is used for detecting a ti... | 04/15/1997 |
| 5469425 | Method of manufacturing an index apparatus A method of manufacturing an index apparatus includes thermally transferring a hot stamped section having a low light reflectance onto an outer peripheral surface of a magnet of a frequency generator for speed detection provided on an outer periphery of t... | 11/21/1995 |
| 5373495 | Disk playback apparatus A disk playback apparatus designed such that the linear velocity of the disk is stabilized during a short period corresponding to one to several revolutions of the disk and occurrence therein of vibration and noise is suppressed is disclosed. The apparatu... | 12/13/1994 |
| 5285432 | Track jump control circuit A track jump control circuit having a pick-up for reading information stored on a disc, a motor for moving the pick-up in a radial direction of the disc, a speed detector for detecting the moving speed of the pick-up and for outputting a speed signal, an ... | 02/08/1994 |
| 5054014 | Optical disk recording/reproducing apparatus and rotary drive therefor An apparatus for rotationally driving an optical disk in an optical disk recording and/or reproducing apparatus capable of recording or reproducing signals from disks having different sizes includes a spindle motor for rotationally driving a disk, a servo... | 10/01/1991 |
| 5050145 | Optical disk recording and reproducing apparatus having faster reproducing speed than recording speed An optomagnetic disk recording and reproducing apparatus includes an optomagnetic disk having a vertical magnetic film capable of recording and reproducing an information signal, a recording and reproducing head unit for recording an information signal in... | 09/17/1991 |
| 5042025 | Rotation control system for disk player A rotation control system for disk player in which the player detects the size of a disk housed in the player, varies the starting torque to be given to the disk motor in response to the detected size, and controls the disk motor so as to require substant... | 08/20/1991 |
| 4906923 | Speed detecting apparatus including a multi-coil device Apparatus for detecting the speed of a moving object when exposed to primary magnetic flux fields and secondary external magnetic flux fields. The apparatus includes a magnetic device which generates the primary magnetic flux fields, a multi-coil device w... | 03/06/1990 |
| 4730298 | Moving device for an optical recording system in a high density spiral track-forming apparatus A high density spiral track forming apparatus according to the present invention includes a linear motion mechanism for moving an optical recording system in a radial direction of a disk-shaped substrate, and a length measurement machine for detecting the... | 03/08/1988 |
| 4710825 | Disc recording system with speed control A system for recording information on an information recording disc such as a magnetic or optical disc. The recording system includes velocity control means for controlling the disc at a predetermined rotation velocity and synchronizing signal phase shift... | 12/01/1987 |
| 4695995 | Front loading disk player with improved disk sensor positioning A front loading disk player of a type capable of playing disks of different diameters wherein the diameter and proper loading of the disk can be detected at all times with a simple sensor arrangement. The inventive disk player includes a housing, a playin... | 09/22/1987 |
| 4691310 | Compact disk read only memory recording system with speed control Digital computer data recorded in a spiral track on the surface of a disk using a laser recording head which moves radially across the disk as it revolves at a constant linear velocity. A system for controlling the disk velocity during the recording proce... | 09/01/1987 |
| 4653040 | Disk size detecting circuit In a disk size detecting circuit, the size of a disk is determined according to the speed of a motor adapted to rotate the disk and the angle through which motor has rotated after the start thereof. A counter, which is reset with the signal which starts t... | 03/24/1987 |
| 4623939 | Rotation control apparatus for a motor A rotation control apparatus for a motor comprises a motor for rotating or moving a recording medium, a circuit for generating first and second reference signals, a circuit for passing a signal which is obtained by comparing phases of the first reference ... | 11/18/1986 |
| 4603412 | Disc rotation servo control apparatus in a disc player The rotation speed of a disc rotation motor is controlled such that a synchronizing signal derived from an output signal reproduced from a disc coincides with a reference oscillation frequency. The amount of data accumulated in a memory provided for absor... | 07/29/1986 |
| 4416006 | Record disc playing apparatus having the function for correcting rotational irregularities due to record disc eccentricity A record disc playing apparatus comprises an address signal generating unit for generating address signals corresponding to horizontal rotational angular positions of a tone arm, a device for generating a rotational angular velocity signal corresponding t... | 11/15/1983 |
| 4381556 | Videodisc reader with longitudinally displaced turntable There is disclosed a device for displacing a video disk with respect to a reading head which includes the driving of a conductive disk by means of a video disk rotational motor. The conductive disk passes through the air gaps of two electromagnets located... | 04/26/1983 |
| 4358796 | Spindle servo system for videodisc player A video disc player is described for use with a video disc having frequency modulated video information recorded thereon in the form of a plurality of concentric circles or a single spiral. The information track comprises successively positioned light ref... | 11/09/1982 |
| 4340943 | Memory device utilizing MOS FETs A memory device utilizing metal oxide semiconductor field effect transistors (MOS FETs) formed in a semiconductor substrate. The memory device is so improved as to be accessed without a delay and as not to behave erroneously, in spite of a potential varia... | 07/20/1982 |
| 4302833 | Automatic record size detector Three sets of light receivers are arranged on the turn table of a phonograph record player. The light radiated on the turn table is received and introduced to light receiving elements for conversion into a pulse signal. When a 30-cm record is placed on th... | 11/24/1981 |
| 4134593 | Automatically operated record player system A turntable includes nine apertures therethrough arranged in three concentric circles and on three radii of the turntable spaced apart 120° C. Light reflectors are located in the respective apertures and selectively covered with different types of gramop... | 01/16/1979 |
| 4111431 | Record player with record determining means A record player having a centrally located record presence and record size sensor is disclosed. The record presence and size detector includes biasing elements and switching elements which are sensitive to record weight for sensing the presence of a recor... | 09/05/1978 |
| 4098510 | Record player A record player including a housing enclosing a turntable with the housing provided with a slot for receiving a disc record which is transported to the turntable and automatically centered thereon. In addition, the record player includes means to detect t... | 07/04/1978 |
