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7355939 |
System and method for switching control modes of spindle motor
A system and method of switching the control modes of spindle motor are described. The switch system comprises a first control module, a second control module and a switch controller. The first...
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7333413 |
Optical storage device rotation speed control apparatus and method
A method for controlling the rotation speed of an optical storage device. In the first mode, a first signal is produced, and in the second mode, a second signal is produced. In one mode, a first...
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7218585 |
Information medium and information recording/reproduction apparatus
An information medium includes a lead in area and a data area capable of recording an arbitrary information signal. The lead in area has a recordable portion where an information signal can be...
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7206269 |
Optical disk recording/reproducing apparatus with reduced resume time
The present invention shortens a time to be elapsed from a recording interruption to a recording restart, thereby realizing a reliable recording restart. In one embodiment, an optical disk...
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7200083 |
Speed control method for recording data on an optical disk
A speed control method used in an optical disk drive for recording data onto an optical disk includes the following steps: detecting an allowable maximum recording speed of the optical disk and an...
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7171156 |
Method and apparatus for transmitting audio and non-audio information with error correction
A method and an apparatus for providing digital quality transmission of audio and non-audio information using low cost components and arrangement. The present invention provides for the...
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7116622 |
Optical storage device rotation speed control apparatus and method
A method for controlling the rotation speed of an optical storage device. In the first mode, a first signal is produced, and in the second mode, a second signal is produced. In one mode, a first...
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7088670 |
Information recording carrier and method of reproducing the same
Plural grooves or lands formed in an information recording carrier include at least a wobbling region and data is recorded wobblingly in this wobbling region by frequency shift modulation while...
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7065018 |
CLV system and method using PSA lookup
A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can be operable to read a...
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7012866 |
Rotation control method for CAV system based on sequential or random access request and on zone access based on access request of recording medium
A rotation control method controls rotation of a CAV system recording medium which has a plurality of zones divided in a radial direction thereof. The rotation control method detects a state within...
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7002885 |
Method for determining an optical write power and an optical disc access system using the same
A method for determining an optical write power and an optical disc access system using the same. In addition to a typical Inner Power Calibration Area, the method includes an Outer (second) Power...
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6961860 |
Method and system for optimizing power consumption during data read/write operation in disk-based memory
A method and system for optimizing energy consumption during data read/write operations in a disk-based memory system is provided. The method includes the steps of reading a data clip length, L s ...
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6901040 |
Kp and Ki lookup system and method
A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can include a first module for...
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6876609 |
System and method for controlling a spin motor
A system and method for controlling spin speed, which includes a module for receiving an indication to make a velocity change from a first RPM to a second RPM. The difference between the first RPM...
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RE38704 |
Optical disk recording method employing a plurality of recording areas and apparatus therefor
An optical disk apparatus comprising a reproduced signal detector which digitizes a reproduced signal from an optical disk, a broadband synchronizing clock signal generator for generating a...
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6829204 |
Method of controlling a rotational rate of an optical disc and optical disc recording device using the same
An optical disc recording device controls a rotational rate of an optical disc and an optical disc recording device recording using a constant angular velocity method, thereby efficiently using the...
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6826136 |
Apparatus and method for controlling reproduction speed of an optical disk
This invention provides method and apparatus for controlling reproduction speed of an optical disk, which detects the magnitude of a disk vibration after initial operation of an optical disk and...
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6762983 |
Optical disc drive and method of controlling rotation number of a spindle motor for rotating an optical disc
An optical disc drive has a spindle motor for rotating an optical disc; an optical pick-up which can move at least in a radial direction of the optical disc; a sensor for detecting the rotation of...
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6751185 |
Optical disc and apparatus for scanning the optical disc
An optical disc is described for recording data, which disc has a recording area subdivided in coaxial annular zones comprising circular or spiral tracks. Each track within one of the zones is...
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6728177 |
Method of recording data on optical disc at high multiple speed and apparatus thereof
An optical disc recording method to record data on a disc using multiple speeds by dividing a disc region into an inner circumference region and an outer circumference region depending on radii of...
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6633524 |
Method for controlling rotation of an optical disk during a zone change in a data read out operation
A method for controlling the number of disk revolutions in a disk drive using a zone CLV control system to reduce or eliminate the possibility of read-out errors when the data read-out position is...
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6515948 |
Data recording and reproducing apparatus
It is intended to prevent occurrence of rotation lock waiting times when a simultaneous recording and reproducing operation is performed on a disc-shaped recording medium according to the ZCLV...
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6473377 |
OPTICAL DISC RECORD CARRIER WITH WOBBLED GROOVES THAT PERMIT RECORDING ON THE GROOVES AND LANDS, APPARATUS FOR MANUFACTURING SUCH A RECORD CARRIER, AND RECORDING AND/OR REPRODUCING APPARATUS FOR SUCH A RECORD CARRIER
An optical disc record carrier having at least one wobbled groove that permits information recording on both groove and land tracks is provided. Each groove has a sync wobbling modulated with a...
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6333903 |
Disk unit and rotating motor control apparatus for recordable optical disk unit
A rotating motor control apparatus for a recordable optical disk unit is constructed to include a data synchronizing rotation control circuit controlling rotation of a rotating motor in synchronism...
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6201776 |
Apparatus for reproducing program data recorded on an optical disc at a multiple velocity
An apparatus for reproducing program data recorded on an optical disc at a multiple velocity without a deterioration of a screen quality is disclosed. Storing section stores data which relates to...
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6122234 |
Recording disk drive using a synchronous driving motor
The information storing apparatus uses an inexpensive synchronous motor as a spindle motor and can execute speed control quickly and accurately. To achieve this, whether the information storing...
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6075761 |
Optical recording medium having pits that are formed with respect to a wobbled groove at substantially constant positions in each cycle of the groove having a pit
An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a...
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RE36590 |
Apparatus and method for accurately scanning a light beam across tracks of a recording medium
A lens is accelerated on a coarse tracking carriage while enabling a lens position servo, which moves the carriage so that the lens returns to a neutral position on the carriage. After the beam...
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6028828 |
Disk type recording medium and disk recording and reproducing device
A disk type recording medium and a disk recording and reproducing device for use in constant linear velocity and zone constant angular velocity systems wherein the disk type recording medium has...
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6026068 |
Optical disk apparatus
A constant linear velocity control (CLV control) for controlling a spindle motor so as to set a linear velocity in a track circumferential direction to be constant and a constant angular velocity...
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6009056 |
Optical disc data reproducing method and optical disk driver
In the operation to access data on a disk, the data reading operation is enabled before the rotary speed of the spindle motor of the disk is completely regulated to thereby minimize the access time...
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5982728 |
Reading information from a disk-shaped recording medium that is rotatable at a plurality of speeds
A reproducing apparatus for disk-shaped recording medium rotationally drives the disk-shaped recording medium at a particular speed to read information from a recording track disposed...
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5959954 |
Information recording/reproducing apparatus with variable rate of revolution and data clock frequency
A data processing apparatus comprising a motor for revolving a disc-shaped recording medium by a given rate of revolution signal, a mechanism for storing data in and reproducing data from a...
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5956308 |
Data storage apparatus
A track on the disk is divided into plural concentric zones on the radial position thereof. During recording, the angular velocity varies according to the zones accessed for recording, and the disk...
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5926449 |
Pre-calibration system and method for CD-ROM drive speed optimization
A system and method for pre-calibrating a CD-ROM drive for each CD-ROM disc inserted into the drive for maximizing the drive's performance without degradation in data transmission. When a CD-ROM...
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5872753 |
Optical disk driving apparatus with tracking control
An optical disk driving apparatus comprises an optical pickup device having a laser beam source for emitting a laser beam to a disk recording medium, a unit for rotating the disk recording medium...
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5828639 |
Recording/playback device and method thereof, and disc
A data recording region of a disc is divided into a plurality of zones, the plurality of zones comprising a plurality of bands, and with a range from an innermost radius to an outermost radius...
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5808995 |
Disk information reading control apparatus having a variable read transfer speed and a disk information reading control method
A disk nearly constant in recording density from the outer circumference to the inner circumference of the disk, such as CLV and M-CAV format, is rotated at a constant angular velocity to read out...
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5780982 |
Method of and apparatus for controlling rotation number of motor
A rotation number of a motor adapted to rotate a record medium having a disc shape with respect to a pickup is controlled. The controlling method is provided with steps of: calculating switching...
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5764609 |
Disk data reproducing method and apparatus for reading data at arbitrary speed
In the operation to access data on a disk, the data reading operation is enabled before the rotary speed of the spindle motor of the disk is completely regulated to thereby minimize the access time...
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5761163 |
Track jump servo apparatus for disc reproducing system
A disc reproducing system having a pickup for reading data recorded on a disc that is rotated by a disc drive motor. The system, also has a clock signal generator for generating a clock signal that...
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5734634 |
Recording method and recording equipment of optical disc reproducing method and reproducing equipment of optical disc
The present invention radiates laser light to an optical disc 1, detects a tracking error signal based on a concave and convex form of a track by means of its reflection light, applies a tracking...
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5726958 |
Spindle motor gain control method for CD-ROM drives and apparatus therefor
A method for controlling the gain of a spindle motor in a CD-ROM drive, includes the steps of: calculating a first number of tracks on a disc from a starting point of a program region to a...
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5724329 |
Apparatus for controlling rotational servo by using frequency pulse signal generator
An apparatus for controlling a rotational servo by using a frequency pulse signal generator is provided. The rotational servo controlling apparatus has a frequency pulse signal generator for...
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5717672 |
Spindle servo apparatus for optical disk player
A spindle servo apparatus for an optical disk player, which detects a maximum inversion interval or a maximum period from a read signal acquired from an optical disk by pickup means, compares the...
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5708649 |
Optical disk capable of storing information data at difference clock rates
A disk storage medium, for example, a magneto-optical compact disk, includes a plurality of data areas that have data stored therein and a plurality of address areas each associated with a...
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5699335 |
Spindle motor driver
A spindle motor driver is provided. The spindle motor driver includes a spindle motor for rotating an optical disc, an optical head for reading signals from the optical disc to reproduce the...
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5691968 |
Optical disk unit
An optical disk unit wherein a disk rotating speed is automatically adjusted for reading optical information from various optical disk types, each optical disk type requiring a different rotating...
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5648944 |
Recording/reproducing apparatus that utilizes the servo clock signals to form read and write clock signals with different frequencies
A disc recording and/or reproducing apparatus including a signal recording/reproducing section for recording and/or reproducing information signals on a disc 64 mm in diameter housed in a cartridge...
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5646921 |
Method and apparatus for reproducing information recorded on CLV disc type record medium
A record medium of disc type is recorded by a constant linear velocity. The record medium is reproduced by a reproducing apparatus, which reads the information from the rotated record medium into a...
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