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7385895 |
Method of discriminating optical disc type and apparatus thereof
A method of discriminating an optical disc type and an apparatus thereof. The method for an optical disc system of recording and/or reproducing an optical disc that includes an optical pickup...
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7385886 |
Optical disk drive and method of controlling spindle motor thereof
An optical disk drive and a method thereof for controlling an optical disk drive spindle motor to adaptively stop the rotation according to the varying level of a detected tracking error signal....
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7382698 |
Optical information recording/reproducing apparatus having tilt correction mechanism and method therefor
An optical information recording/reproducing apparatus and are provided under a state where a focus servo is driven, a tracking error signal recorded on the recording medium or a sum signal of a...
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7366063 |
Optical discs for measuring analytes
This invention directs to an optical disc assembly configured to receive an analyte which can be detected by a standard optical disc reader or an optical disc reader modified therefrom. The optical...
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7349296 |
Write control in response to tracking error
A method for controlling writing on a data carrier device, at least including: writing data on the data carrier device with a data writer device; obtaining a tracking error signal corresponding to...
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7345963 |
Method and related apparatus for deriving a tracking error signal
A method for deriving a tracking error signal based on a first analog detection signal and a second analog detection signal. The method includes summing the first analog detection signal and the...
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7342852 |
Method and apparatus for differing focus between at least two dimensions
The present invention obtains a more optimal focus in at least two dimensions (such as axial and radial dimensions) by setting or keeping a focus in at least a first dimension (such as both axial...
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7333412 |
Optical recording/reproducing apparatus, focusing method therefor, and optical disk recording medium
A method and apparatus for realizing a stable focus jump operation even in a case where a waveform of an S-curve of a focus error signal fluctuates due to aberration due to fluctuation of a...
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7333405 |
Optical disk device and information recording/reproducing method
An optical disk device is provided with an optical pickup that includes a convergent optical system having an objective lens for converging a light beam emitted from the laser light source to form...
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7324418 |
Method and apparatus of determining a type of disc
A method of determining a type of a disc for a disc system to record/reproduce a plurality of recordable discs having different track pitches, including detecting a plurality of signals for...
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7315495 |
High-speed focus pull-in controllers for adaptively responding to disk surface vibration of an optical disk device and focus control methods thereof
Upper and lower limit values of disk surface vibration are detected and stored per a predetermined time while a signal is reproduced from an optical disk device and, if focus on the disk deviates...
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7301859 |
Track error detection device having a function of removing a phase offset, and phase offset removing method thereof
A track error detection device that removes a phase offset and a phase offset removing method thereof removes an error signal generated by device circuit errors. The device includes an equalizing...
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7295501 |
Apparatus and method for controlling a focus jump and level thereof in a multilayer optical disk
A focus control is performed on the basis of a focus error signal indicative of a deviation amount from a focus state in a recording layer of a laser beam emitted for reproducing information to an...
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7295498 |
Disk apparatus and method of generating a tracking error signal
Comparators compare the amplitudes of a DPD tracking error signal indicating the phase difference between the detection signals supplied from a photodetector, and a PP tracking error signal...
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7289405 |
Apparatus and method for detecting optical disc type and/or adjusting track balance
Provided are an apparatus and method for detecting a type of an optical disc inserted into an optical disc system and/or adjusting a track balance in the optical disc system by detecting voltages...
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7289396 |
Disk device
A driver IC 1 has a bias terminal 20 a via which a bias voltage fed from a microcomputer 2 to drive and control a loading motor 4 is fed in and a bias terminal 20 b via which a bias...
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7283432 |
Method and device for correcting optical path deviation of an optical pickup in an optical recording system
A device for correcting optical path deviation of an optical pickup in an optical recording system includes a push-pull signal generator for generating a push-pull signal while the optical pickup...
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7280445 |
Optical pick-up
A finite optical system that a laser beam from a light source is allowed to be directly incident on an objective lens without passing a collimate lens is employed. The reference position of the...
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7280444 |
Objective optical element, optical pickup device, and optical information recording and reproducing device
An objective optical element to be used for an optical pickup device for performing reproducing and/or recording of information to a first optical information recording medium and a second optical...
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7276680 |
Control unit and optical disk drive including the control unit
An information processing apparatus includes: a converging section for converging light; a shifting section for shifting the focus of the light by moving the converging section perpendicularly to...
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7266056 |
Method of focus position adjustment by controlling a deviation value and system thereof
The present invention provides a focus position adjustment method for adjusting a focus position by which an optical storage device reads an optical storage medium. The optical storage medium...
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7257053 |
Optical disc apparatus
An optical disk apparatus having a high reliability by evading collision between a condensing lens and an optical disk regardless whether the focus control is in the operative state or in the...
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7257052 |
Control apparatus and optical disk apparatus
A tracking control apparatus comprises an signal processing section, a lens characteristic measuring section and an optimum lens position searching section. The lens characteristic measuring...
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7242646 |
Track locking method for optical disk drive and apparatus
A track locking method and an apparatus thereof enable an optical disk drive to rapidly and stably read data recorded on a target track from a seeking mode to a track locking mode. An optical...
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7212473 |
Method and device for adjusting focus bias in optical disc apparatus
A method and device are provided for adjusting a focus bias of an objective lens of an optical pickup for an optical disc using a level of a tracking error signal. The level of the tracking error...
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7206264 |
Method for regulating the tracking of a scanning device and drive for the same
A method is provided for regulating the tracking of a scanning device, for example, a read/write head, of a drive. A drive for storage media having a scanning device is also provided, permitting...
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7190644 |
Track-locking method and apparatus for optical disk drive
A track-locking method for an optical disk drive is conducted according to the following steps. First, a tracking error signal (TE signal) is detected, and then the time period for a pickup head...
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7184374 |
Layer jump control device and method of high-speed optical drive
A real-time wobble detector and an adaptive layer distance balancing calculator are added in a layer jump control device of a high-speed optical drive to solve failure and instability caused by the...
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7170847 |
Means for limiting an output signal of an amplifier stage
An electronic circuit is provided which can autonomously handle an input current (I i ) having a relatively wide dynamic range without being overdriven. The electronic circuit comprises an...
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7164627 |
Optical pickup actuator circuit having coil protection feature
An optical pickup actuator circuit includes: a lens holder 2 supported so as to be slidable along a support shaft and rotatable around the support shaft and for holding an objective lens 8 so...
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7161880 |
Disk apparatus for projecting a laser beam onto a recording surface of a disk recording medium
A disk apparatus ( 10 ) includes an optical lens ( 14 ). A seek operation is performed by moving the optical lens in a radius direction of a recording surface of a magnetooptical disk ( 40 ). When...
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7145854 |
Recording layer determination apparatus for determining whether recording layer of recording medium is single-layer or multi-layer
An objective lens of an optical pickup is made to move from far position to near position with respect to DVD with constant speed, and a timer counts time taken for the movement of a focus of a...
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7145845 |
Optical disc player having a carriage control system relying upon a multiplied periodic signal and a tracking error signal
For reproducing and/or recording information from/onto an optical disc, a pickup is used to detect a target track on the disc through an optical beam. In carriage servo control, movement of the...
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7142485 |
Information storage apparatus
The present invention provides an information storage apparatus that generates a tracking error signal based on a detection signal, and performs various control operations based on the tracking...
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7126899 |
Optical recording medium processing device and focal point control method thereof
The focus is moved from a first layer (L 0 ) to a second layer (L 1 ) of a double-layered optical disk by stopping a control loop operation and applying acceleration pulses for an interlayer jump...
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7116609 |
Optical storage system and control method
A reference-position learning unit measures a current of one rotation of a medium in a state in which the focus of an objective lens is pulled-in by a focus pull-in control unit at a predetermined...
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7102967 |
Method and apparatus for tracking error detection in optical disk driver
A method and apparatus for tracking error detection in an optical disk reproduction system. The tracking error detecting apparatus generates a tracking error signal as a difference signal of...
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7099253 |
Method and apparatus for DVD recognition using inner and outer tracking error signals
A DVD recognition method and apparatus is disclosed. First, a disc recognition apparatus uses a laser with a specific wavelength to irradiate an inner area of the DVD, thereby obtaining an inner TE...
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7095683 |
Tracking and focus digital servo system with write abort
A write abort algorithm of a tracking and focus servo system that can abort a write operation on an optical disk drive is presented. The write abort algorithm monitors at least one of a tracking...
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7072263 |
Optical disc recording and playback apparatus
A pickup control circuit ( 5 ) for performing a control operation of an optical pickup ( 3 ) and an error detection circuit ( 14 ) for detecting an error signal from a servo signal obtained from...
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7054250 |
Method and device for jitter enhancement in an optical disc system
A method and device are provided for jitter enhancement in an optical disc system. The optical disc system generates a signal that includes an effective component having a first slew rate, and a...
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7054238 |
Signal shaping circuit
The present invention relates to a signal shaping circuit which is capable of shaping a returning light signal of a modulated signal whose signal level and signal length are arbitrarily varied such...
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7054237 |
Optical disk device
An optical disk device for driving an optical disk having an emboss section and a data section comprises an optical pickup for replaying address information by irradiating a laser beam onto the...
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7050366 |
Device and method for detecting non-writable region of optical recording medium
Device and method for detecting a non-writable region of an optical recording medium, wherein a read channel 1 signal and a read channel 2 signal are sliced at respective slice levels to...
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7035176 |
Method and device for timely outputting focusing completion signal to realize focusing condition of optical pickup head
A method is provided for outputting a focusing completion signal to realize a focusing condition of an optical pickup head for an optical access apparatus. The method is described as follows. A...
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7020053 |
Optical disc apparatus
In an initial operation of an optical disc apparatus for reading out information data recorded in the innermost data recording area on the optical disc, a main processor judges whether periods...
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7016269 |
Optical pickup apparatus and focusing control method
An optical pickup apparatus having an irradiation optical system for condensing a light beam on a track of a recording plane and a photodetection optical system for guiding return light to a...
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7012859 |
Method and apparatus for controlling reproduction of optical recording medium
A method and apparatus for controlling reproduction of an optical recording medium is disclosed. According to the method and apparatus, a moving direction of an object lens on a disc is detected...
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7009918 |
Information storage apparatus
The present invention provides an information storage apparatus that generates a tracking error signal based on a detection signal, and performs various control operations based on the tracking...
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7009917 |
Layer jump control for an optical drive
A layer jump control apparatus of an optical drive. The layer jump control apparatus has a pick up head, a preamplifier, a controller producing a focusing control signal FC, a low pass filter for...
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