Class / Patent application number | Description | Number of patent applications / Date published |
369440270 | Initialization/start-up or changing modes of system | 50 |
20080205210 | Apparatus and Method For Determining Write Strategy Parameters For Recording Data on an Optical Record Carrier and For Determining Read Parameters For Reading Data From an Optical Record Carrier - The present invention relates to an apparatus and a corresponding method for determining write strategy parameters for recording data on an optical record carrier ( | 08-28-2008 |
20080205211 | STRUCTURE AND METHOD FOR STORING DATA ON OPTICAL DISKS - During manufacturing of optical disks, mastering equipment inserts marks (“high frequency wobble marks” or “HFWMs”) into the wobble of the groove on optical disks to store data. The presence of a HFWM at a zero crossing of the wobble indicates an active bit and the absence of the HFWM indicates an inactive bit. The zero crossing is, for example, a negative zero crossing. A matched filter is used to detect the shape of the HFWMs. If a HFWM is detected during a wobble cycle, an active bit is saved in a register or a memory. If a HFWM is not detected during a wobble cycle, an inactive bit is saved in a register or a memory. The active and inactive bits may be coded bits that must be decoded to data bits. The data bits include information such as a synchronization mark, a sector identification data, and an error detection code. | 08-28-2008 |
20080219111 | Drive and Method of Operating the Drive and an Optical Data Carrier Therefore - A drive, a method of operating the drive and a hybrid disc, BD9, comprising the physical layer of a dual layer DVD disc, DVD9, and the application layer of a Blu-ray disc (BD). The disc comprises a reserved area containing a modulation code and a file structure of the application layer and a BD-ROM mark for a copy protection system (CPS) according to the established BD-ROM format. The disc is readable by a conventional DVD drive, but the firmware and specific hardware and software ( | 09-11-2008 |
20080247281 | Data Recording Device, Data Recording Method, and Computer Program - It is possible to manage an empty region in a disc partition while satisfying an inhibit matter of the ROM standard not recording a space bit map describer (SBD). The SBD is recorded upon disc initialization and additional recording into the partition is performed by using the SBD regardless of the access type in the device. When ejecting the disc, pointer information to the SBD recorded in the partition describer (PD) is hacked up in the SBD pointer information save file or save data and then the pointer information is erased. Upon disc recognition, the existence of the save file/data is confirmed and the SBD is restored. | 10-09-2008 |
20080279058 | Information Recording/Reproducing Device, Information Recording/Reproducing Method, and Information Recording/Reproducing Program - It is possible to obtain preferable recording characteristic and reproduction characteristic by considering irregularities of unique characteristics of an LD or the like mounted on an information recording and reproduction apparatus as well as characteristics of an optical disc used. In the information recording and reproduction apparatus, a light source such as a laser diode is driven by a laser drive signal so that a laser beam for recording or reproduction is emitted from the light source. Moreover, the laser drive signal is superimposed by a high-frequency signal of a predetermined frequency so as to eliminate effect of the return light from the optical disc. The information recording and reproduction apparatus superimposes the high-frequency signal by using a high-frequency signal level during recording which is different from a high-frequency signal level during reproduction. | 11-13-2008 |
20090003151 | System and Method for Controlling a Tracking Servo During Label Printing - A visible light characteristic changing layer formed from photosensitive or heat-sensitive material is formed in a location which can be viewed from a part of a label surface of an optical disk. The optical disk is set on a turntable of an optical disk unit while the label surface of the optical disk is directed downward. The optical disk and an optical pickup are moved mutually along the plane of the optical disk. In synchronism with the relative movement, the power of a laser beam output from the optical pickup is modulated in accordance with image data, such as characters or graphic images to be printed, and the laser beam is emitted onto the visible light characteristic changing layer. As a result of the visible light characteristic changing layer being exposed to the laser beam, a visible-light reflectivity of the visible light characteristic changing layer is changed, thereby forming a image corresponding to the image data on the label surface. | 01-01-2009 |
20090059743 | METHOD OF CONTROLLING SERVO IN OPTICAL DISC DEVICE AND SERVO CONTROL DEVICE USING THE SAME - A method of controlling a servo in an optical disc device and a servo control device using the method, in which the servo control device controls a servo for printing on a label surface of an optical disc and includes an optical pickup unit, an error signal generation unit, and a control unit. The optical pickup unit outputs a plurality of signals corresponding to a position of an object lens in response to light reflected from the label surface. The error signal generation unit outputs an error signal by selecting or combining one or more of the plurality of signals. The control unit adjusts the position of the object lens in response to the error signal. Therefore, because the position of the object lens can be adjusted with an increased range, the spot size of a beam condensed by the object lens can be adjusted within an increased range, and a data recording time can be reduced. Moreover, data retention characteristics and recording quality can be improved. | 03-05-2009 |
20090092010 | METHOD AND APPARATUS FOR DETERMINING WRITE STRATEGY PARAMETER VALUES FOR WRITING DATA ON AN OPTICAL DISK - The invention relates to a method for determining write strategy parameter values for writing data on an optical disk from a group of optical disks of different types using an optical disk drive, in particular to different types of BD disks. The method includes identifying the type of optical disk, the type of optical disk being associated with a standard write strategy with standard write strategy parameters; determining a cluster write strategy with cluster write strategy parameters, the number of cluster write strategy parameters being smaller than the number of standard write strategy parameters; initializing the cluster write strategy parameters with initial cluster write strategy parameter values; and optimizing cluster write strategy parameter values for at least a subset of the cluster write strategy parameters. The optimizing is preferably performed on optimization sets of cluster write strategy parameters in a pre-determined optimization order. | 04-09-2009 |
20090109810 | RECORDING/REPRODUCTION APPARATUS - A recording/reproduction apparatus includes a first recording medium (a flash memory) having a first time that is required for the first recording medium to go from a low-power consumption state to a state in which recorded video data can be read out, and a second recording medium (an HDD or a DVD drive) having a second time that is required for the second recording medium to go from a low-power consumption state to a state in which recorded video data can be read out, where the second time is longer than the first time. When a video content is reproduced from the second recording medium in the low-power consumption state, the first recording medium is caused to go to a readable state while the second recording medium is not in a readable state, and a leading portion of the content is reproduced from the first recording medium. Thereby, a start-up time of the second recording medium that is required until reproduction is permitted is concealed from the user, and the user's reproduction request is immediately responded. | 04-30-2009 |
20090154307 | SERVO PARAMETER DETECTION METHOD AND OPTICAL PICKUP DEVICE USING THE SAME - An optical pickup inspection device | 06-18-2009 |
20090303846 | Method and apparatus for recording and reproducing information on and from optical disc - An apparatus for recording and reproducing an information signal on and from an optical disc includes a memory. The information signal is written into the memory. The information signal is read out from the memory. An optical head generates a laser beam in response to the readout information signal, and applies the laser beam to the optical disc to record the readout information signal on the optical disc. A test signal is recorded on a position of the optical disc near a recording position thereof via the optical head during the writing of the information signal into the memory. The test signal is reproduced from the optical disc. The reproduced test signal is evaluated to generate an evaluation result. An intensity of the laser beam is optimized in response to the evaluation result. | 12-10-2009 |
20100118669 | OPTICAL DISK APPARATUS AND FOCUS JUMP METHOD FOR MULTILAYER OPTICAL DISK - The present invention provides an optical disk apparatus and a focus jump method capable of reliably performing a focus jump by appropriately obtaining the amplitude of a signal such as a focus error signal in a multilayer optical disk. An optical disk includes jump areas which are provided separately from data areas and at which a focus jump is performed. When a focus jump is performed, an optical pickup is moved to the jump area, and the laser power level of the optical pickup is changed and set in accordance with a target layer to which the focus is jumped. A focus position is allowed to reach the target layer by counting the number of times of intersecting with recording layers using a reflected light from the optical disk while performing a focus sweep of an objective lens in the optical pickup. | 05-13-2010 |
20100118670 | SERVO CONTROL SIGNAL GENERATION DEVICE AND AN OPTICAL DISK DEVICE USING THE SAME - A servo control signal generation device for discriminating a kind of an optical disk, changing over between top and bottom envelope signals of an RF signal, and generating a defect signal and a mirror signal includes an RF generator for generating the RF signal from reflected light of an optical disk, a disk discriminator for discriminating a kind of the optical disk from the RF signal, and a top envelope generator and a bottom envelope generator respectively for generating the top and bottom envelope signals of the RF signal. If the disk has reflectance after recording which is lower than that before recording, the defect and mirror signals are generated respectively from the top and bottom envelope signals. If the disk has reflectance after recording which is higher than that before recording, the defect and mirror signals are generated respectively from the bottom and top envelope signals. | 05-13-2010 |
20100172222 | INFORMATION REPRODUCING APPARATUS, SERVO ADJUSTING METHOD, AND THE LIKE - The present invention provides an information processing apparatus, a servo adjustment method, and the like realizing reduced time required for servo adjustment. | 07-08-2010 |
20100254233 | INITIALIZATION METHOD FOR INFORMATION RECORDING MEDIUM, INITIALIZATION APPARATUS FOR INFORMATION RECORDING MEDIUM, AND INFORMATION RECORDING MEDIUM - According to the present invention, a recording film is partially initialized using a first light beam (A) having a wavelength for initialization, focus adjustment is performed using a second light beam (B) having a wavelength corresponding to a wavelength for recording and reproducing information on and from an information recording medium, and then the recording film is initialized using the first light beam (A), thereby it is possible to securely initialize recording films of all information layers of a multilayer information recording medium. | 10-07-2010 |
20110164482 | Method and apparatus for recording and reproducing information on and from optical disc - An apparatus for recording and reproducing an information signal on and from an optical disc includes a memory. The information signal is written into the memory. The information signal is read out from the memory. An optical head generates a laser beam in response to the readout information signal, and applies the laser beam to the optical disc to record the readout information signal on the optical disc. A test signal is recorded on a position of the optical disc near a recording position thereof via the optical head during the writing of the information signal into the memory. The test signal is reproduced from the optical disc. The reproduced test signal is evaluated to generate an evaluation result. An intensity of the laser beam is optimized in response to the evaluation result. | 07-07-2011 |
20110164483 | Method and apparatus for recording and reproducing information on and from optical disc - An apparatus for recording and reproducing an information signal on and from an optical disc includes a memory. The information signal is written into the memory. The information signal is read out from the memory. An optical head generates a laser beam in response to the readout information signal, and applies the laser beam to the optical disc to record the readout information signal on the optical disc. A test signal is recorded on a position of the optical disc near a recording position thereof via the optical head during the writing of the information signal into the memory. The test signal is reproduced from the optical disc. The reproduced test signal is evaluated to generate an evaluation result An intensity of the laser beam is optimized in response to the evaluation result. | 07-07-2011 |
20110205872 | OPTICAL DISC DRIVE AND METHOD OF CONTROLLING THE SAME - An optical disc drive for reading or writing information on a multilayer optical disc having a plurality of recording layers by irradiating the disc with a light beam includes an optical pickup for irradiating the disc with the light beam, a focus error signal generator for generating a focus error signal that indicates a state of displacement of a focal point of the light beam from a recording layer based on reflection from the disc, a recording state detector for detecting a data recording state at a landing point of the focal point in a focus jump, a threshold setting unit for setting a threshold to be compared with the focus error signal based on the data recording state at the landing point, and a focus jump controller for controlling the focus jump based on a result of comparison of the focus error signal with the threshold. | 08-25-2011 |
20110216638 | OPTICAL DISC DEVICE AND TRACKING SERVO CONTROL CIRCUIT THEREFOR - In an optical disc device, a way of canceling a lens shift due to an electric offset of an output of a tracking actuator driving circuit is desired. A tracking servo control circuit contains a first operation mode for setting an output current of the tracking actuator driving circuit to generally zero and a second operation mode for supplying a predetermined potential to the input. An average potential of a push-pull signal detected in the first operation mode is acquired. An object lens is moved by a predetermined amount in both radial directions by changing a potential supplied in the second mode to acquire correlative relationship between average potential of a push-pull signal relative to a lens movement amount and the supplied potential. An offset amount is acquired from the potential and the correlative relationship to cancel the offset. | 09-08-2011 |
20120008472 | PROVIDING DEVICE-LEVEL FUNCTIONALITY WITHOUT ALTERING INSTRUCTIONS STORED IN DEVICE MEMORY - Systems, methods, and machine-readable media provide device-level functionality without altering device memory. A non-transitory machine-readable medium can store a first set of instructions that are executed by the machine to provide device-level functionality unsupported by a second set of instructions stored in device memory associated with the machine without altering the second set of instructions stored in the device memory. For example, the machine can be an optical disc player and the medium can be an optical disc. | 01-12-2012 |
20120113778 | OPTICAL DISC DRIVE CAPABLE OF CHANGING MODE AND METHOD FOR CHANGING MODE IN THE SAME - The present invention provides an optical disc drive and a method for changing a mode in the same. In an embodiment of the present invention, it can be determined whether to change a mode of the optical disc drive based on a command sent from a host connected through an interface. If a predetermined command is sent from the host within a predetermined time after the optical disc drive is newly connected to the host or power is supplied to the optical disc drive while the optical disc drive is already connected to the host, the mode may be switched into a first mode of connecting to a computer, and otherwise the mode may be switched into a second mode of connecting to a host with a function of playing data of a medium connected through the interface. Accordingly, the optical disc drive can automatically change its operation mode. | 05-10-2012 |
20120188861 | POWER SAVING METHOD AND SYSTEM APPLIED IN OPTICAL DISK DRIVE - A power saving method and a power saving system are applied in an optical disk drive. The power saving system comprises a power controlling unit for differentiating the specific sets of circuits not being used at a specific operation rate and powering them down. The sets of circuits not being used will be powered up while the associated operation rate at which they are required to operate is nearly started. | 07-26-2012 |
20120281513 | RECORDING APPARATUS, RECORDING METHOD, AND OPTICAL RECORDING MEDIUM - [Object] To enable stable void recording to be performed with lower power than in a case where a conventional void recording method that records hole marks (voids) in a bulk layer is adopted. | 11-08-2012 |
20120314552 | OPTICAL DISC APPARATUS - An optical disc apparatus includes an optical pickup, a signal generation section which generates a control signal from an electrical signal, and a main control section which controls the optical pickup such that, during a spin-up operation of an optical disc, the optical disc is discriminated to be a multiple-layer disc with three or more layers and address information is successfully acquired from the optical disc, the optical pickup irradiates the optical disc with a light beam at a light emission power for a multiple-layer disc with three or more layers. However, if disc information is not successfully acquired, the main control section controls the optical pickup to try again to acquire the disc information at the light emission power for a multiple-layer disc with three or more layers. | 12-13-2012 |
20120320720 | Methods, Systems, And Computer Program Products For Correcting Repeatable Runout - Methods and systems are described for correcting repeatable runout. In one aspect, an open loop tracking signal is received and squared. A discrete Fourier transform (DFT) of the squared open loop tracking signal is obtained. A velocity magnitude and an absolute value of the phase of the open loop tracking signal is determined. A RRO correction signal is iteratively constructed by performing a partial correction based on an initial phase selected and an initial velocity amplitude, measuring a relative velocity amplitude, performing a partial control correction using the initial phase and relative velocity amplitude if the amplitude is smaller than an initial amplitude; performing a partial control correction using the initial phase and the relative velocity amplitude if the amplitude is smaller than an initial amplitude, and repeating the above steps until a tracking controller can perform closed loop control of the track to optical pickup unit velocity. | 12-20-2012 |
20140160909 | OPTICAL DISK DRIVE AND START-UP OPERATING METHOD THEREOF - A start-up method of an optical disk drive, comprising: starting to accelerate a spindle motor after initializing a digital signal processor; starting an laser diode driver of an optical pickup head after the spindle motor starts accelerating; and starting a servo control of the optical pickup head. During the step of starting the laser diode driver, the spindle motor is accelerating. | 06-12-2014 |
369440280 | While track jumping or crossing | 14 |
20080205212 | OPTICAL HEAD APPARATUS, INFORMATION RECORDING/REPRODUCING APPARATUS INCLUDING THE OPTICAL HEAD APPARATUS, AND INFORMATION RECORDING/REPRODUCING METHOD - According to one embodiment, an optical head device provides a signal processing circuit which sets a control amount to move an objective lens so that a distance between the objective lens and a given recording layer of the an optical disc coincides with a focal position, an optical path length correction mechanism which corrects an influence of an aberration component producing an error in the focal distance, a thickness difference detection circuit which finds an amount of correction to be made by the optical path length, and an aberration correction circuit which generates a correction signal to correct the influence of the aberration component producing the error in the focal distance detected by the thickness difference detection circuit, and supplies the correction signal to the optical path length correction mechanism. | 08-28-2008 |
20080239892 | Method and System for Recording Data on an Optical Disc by a Plurality of Laser Beams - The invention relates to a system and method of recording data on an optical disc by a plurality of laser beams positioned along inner tracks to outer tracks of said optical disc, said optical disc comprising segments each being identified by a start of segment, said method comprising the steps of: switching writing on ( | 10-02-2008 |
20080285397 | METHOD AND DEVICE FOR READING INFORMATION RECORDED IN A BOUNDARY AREA ON AN OPTICAL DISC - The present invention provides a method for reading information recorded in a boundary area adjacent to a boundary between a first area and a second area on an optical disc. The method includes: controlling a pick-up head (PUH) to detect the optical disc to generate a detection signal accordingly; moving the PUH along a first direction from a start point; monitoring the detection signal and stopping the PUH when the detection signal changes; moving the PUH along a second direction; monitoring the detection signal and stopping the PUH in the boundary area of the first area when the detection signal changes; and reading the information recorded in the boundary area of the first area by the PUH. | 11-20-2008 |
20090116347 | OPTICAL DISC APPARATUS AND SEEK PROCESSING METHOD - An optical disc apparatus of the present invention includes an optical head ( | 05-07-2009 |
20090161504 | OPTICAL DISC DRIVE DEVICE AND TILT CORRECTION DEVICE - An optical disc drive device has an FE signal generator which generates a focus error signal, a TE signal generator which generates a tracking error signal, a return beam detector which detects a return beam reflected by an optical disc after irradiated by an optical pickup to generate a return beam level signal, a return beam gain setting part which sets amplitude adjustment amount of the return beam level signal so that a signal level of the return beam level signal generated by the return beam detector coincides with a predetermined reference level, an FE gain setting part which sets amplitude adjustment amount of the focus error signal in accordance with the signal level of the return beam level signal adjusted by the return beam gain setting part so that a signal amplitude of the focus error signal is constant, and a TE gain setting part which sets amplitude adjustment amount of the tracking error signal in accordance with the signal level of the return beam level signal adjusted by the return beam gain adjustment part so that a signal amplitude of the tracking error signal is constant. | 06-25-2009 |
20090213703 | Track Calculation Method for Fixing Track Jumps of Optical Discs of Different Capacities - An appropriate track calculation equation is inducted according to a relationship between a storage area and a track pitch of a compact disc, and a pickup unit is instantly shifted to a location calculated with the track calculation equation. Therefore, an error after performing a track jump modulation is reduced to a smallest degree, and in other words, the pickup unit may access a location on the disc currently required by a user without frequent or time-consuming long seeks. As a result, when the pickup unit accesses compact discs having unknown formats, which indicate different capacities or properties, a track error may be calculated in a shortest time so as to shift the pickup unit accordingly and to fix track jumps, and the user may browse any location on the compact discs having unknown formats smoothly. | 08-27-2009 |
20090245038 | TRACK-JUMP CONTROL SYSTEM AND METHOD FOR MAINTAINING TRACK-JUMP STABILITY - A track-jump control system and method are provided. The track-jump control system applied in an optical disc drive comprises a signal generator, a protection device, a velocity estimator, and a controller. The signal generator receives the signal from the PUH and generates a tracking signal and a position signal. The protection device receives the position signal and when the position signal represents the PUH pass a predetermined position of the optical disc, the protection device generates a protection signal. The velocity estimator estimates the velocity of the PUH according to the tracking signal, and then generates a velocity signal. The controller receives the velocity signal and the protection signal, protects the velocity signal according to the protection signal, and generates a control signal to control the track-jump according to the protected velocity signal. | 10-01-2009 |
20090274021 | Optical Information Recording/Reproducing Method and Optical Information Recording/Reproducing Device - An acceleration pulse waveform adjusting circuit ( | 11-05-2009 |
20100080092 | Optical disc apparatus - A simple circuit configuration allows an optical disc apparatus to reduce a problem of sound skips occurring due to damage on an optical disc. To this end, an LPF extracts a low-frequency component from a tracking actuator drive signal obtained by a tracking actuator driver. When the optical disc apparatus reads and writes information to and from the optical disc, a sled drive signal supplier outputs a sled pulse signal, as a drive signal for a sled motor, for a set-up predetermined time within each interval of a predetermined length, the sled pulse signal having a level corresponding to a level of the low-frequency component obtained by the LPF. On the other occasions, the sled drive signal supplier outputs the low-frequency component obtained by the LPF as the drive signal for the sled motor. | 04-01-2010 |
20100085848 | METHOD FOR PERFORMING TRACK-SEEKING IN AN OPTICAL DISK DRIVE - The invention provides a method for performing track-seeking in an optical disk drive. In one embodiment, the optical disk drive is about to perform a series of operations comprising a plurality of prior operations and a track-seeking operation, and the track-seeking operation is divided into a pre-seek procedure and a true-seek procedure. First, a microprocessor of the optical disk drive performs the prior operations. Whether the microprocessor is unoccupied is then detected before performing the prior operations is completed. When the microprocessor is detected to be unoccupied, the microprocessor performs the pre-seek procedure. The true-seek procedure is then performed according to results of the pre-seek procedure to move the pick-up head to a destination address of an optical disk. | 04-08-2010 |
20100165803 | DISC DEVICE - A disc device for recording and/or reproducing information with respect to a disc having flexibility includes a head for writing and/or reading, the head being disposed below the disc; a disc rotating section which rotates the disc; and a head retracting section which retracts the head to a retracted position where contact with the disc is avoidable, based on a judgment that power supply to the disc device is cut off. | 07-01-2010 |
20100214887 | DEVICE AND METHOD FOR SCANNING AN OPTICAL RECORDING MEDIUM AND OPTICAL RECORDING MEDIUM - The present invention relates to a device ( | 08-26-2010 |
20110051575 | FOCUS JUMP METHOD AND OPTICAL DISC APPARATUS - An optical disc apparatus includes a multilayer optical disc having a reproduction-only recording layer and a recording layer of the recordable area, on the disc, to record and reproduce the disc by the same wavelength laser light, so that a seek operation is performed rapidly, and a generation method tracking error signal (TE) is switched over by using a DPD method and push-pull method in response to a target layer to which a focus jump is applied, for a time period during which a tracking servo loop is opened in association with a focus jump. | 03-03-2011 |
20110205873 | LONG SEEK CONTROL SYSTEM AND METHOD THEREOF USED IN OPTICAL INFORMATION REPRODUCTION/RECORDING SYSTEM - A long seeking control method, for an optical information reproduction/recoding system having a lens and a sledge, includes: obtaining a sledge estimation velocity, a sledge estimation displacement, a sledge reference velocity and a first force applied to the sledge; determining to generate the sledge estimation velocity and the sledge estimation displacement in a first open loop control or in a first close loop control based on the sledge estimation velocity; determining to generate the a second force applied to the lens in a second open loop control or in a second close loop control based on the sledge estimation velocity; and pushing the sledge and the lens by the first force and the second force. | 08-25-2011 |
369440290 | Servo loop gain/switching control | 10 |
20080239893 | Optical Disc Apparatus - An optical disc apparatus capable of conducting seek processing stably. If an angle is given to an objective lens in a radial direction by using an actuator at the time of seek processing, then it is possible to correct deviation between an amplitude center of a tracking error signal obtained when crossing a track and a level obtained when a tracking servo system is in the on-state, which is caused by an objective lens getting out of a center of intensity distribution of laser light. The deviation can also be improved by adding an offset to the tracking error signal. Therefore, stable seek processing is conducted by conducting tilt correction or adding an offset to the tracking error signal, according to a movement condition. | 10-02-2008 |
20090103403 | OPTICAL DISC APPARATUS AND LENS SHIFT CORRECTION METHOD - An optical disc apparatus, which executes tracking control for an objective lens by generating a push-pull signal, includes a determination unit which detects symmetry of the push-pull signal and determines whether balance of signal characteristics of the push-pull signal is good, a lens shift amount detection unit which detects, in a case where the determination unit determines that the balance of the signal characteristics of the push-pull signal is not good, a lens shift amount of the objective lens in such a manner as to improve the balance of the signal characteristics, a memory unit which stores the lens shift amount that is detected by the lens shift amount detection unit, and an addition unit which constantly applies the lens shift amount, which is stored in the memory unit, to a tracking actuator which shifts the objective lens. | 04-23-2009 |
20090154308 | OPTICAL DISC APPARATUS, GAIN SETTING METHOD AND PROGRAM - There is provided an optical disc apparatus that includes a sound pickup portion, an optical pickup to record a sound picked up by the sound pickup portion as audio data onto an optical disc using laser light, a focus adjustment portion to adjust a focal position of the laser light based on the focus drive signal, a tracking control portion to control tracking so that the optical pickup traces a track formed on the optical disc, and a gain setting portion to change the gain of the focus drive signal during a first period when adjustment of the focal position of the laser light by the focus adjustment portion is performed and control by the tracking control portion is not performed according to a level of an operation sound of the focus adjustment portion. | 06-18-2009 |
20090213704 | OPTICAL DISK APPARATUS AND SERVO CONTROL METHOD - According to one embodiment, an optical disk apparatus comprises an optical pickup which irradiates an optical disk with a light beam and receives reflected light from the disk, and a driving module which drives the pickup. The driving module includes an error detector which detects a tracking servo error with respect to a recording track on the disk from an output signal of the pickup and a tracking control module which performs tracking control over the pickup based on a servo error signal from the error detector. The control module is configured to temporarily set a tracking servo to an OFF state upon switching from a reproduction state to a recording state, measure an offset of the servo error signal, perform offset correction for the offset with respect to the servo error signal, and restore the tracking servo to an ON state after the offset correction. | 08-27-2009 |
20090245039 | OPTICAL RECORDING/REPRODUCING APPARATUS - An optical recording/reproducing apparatus includes a disc, a pickup to irradiate a laser beam to the disc and detect a reflected light of the irradiated laser beam, a controller to generate a tracking error signal from a signal of the reflected light and generate a control driving signal for track following by using the tracking error signal, a driving unit to perform tracking servo control by driving an actuator of the pickup according to the control driving signal, and an output unit to output an accelerating and decelerating control driving signal transmitted to the driving unit during the tracking servo control as a pulse width modulation (PWM) signal. | 10-01-2009 |
20090262610 | APPARATUS HAVING SWITCHABLE SERVO GAINS AND OFFSETS FOR OPTICAL DISK DRIVE AND METHOD THEREOF - An apparatus having switchable servo gains and offsets for an optical disk drive adjusts its gains and offsets through the coupling of a servo signal and a switch with several changeable paths. The servo signals are either designated to undergo signal reduction with respect to a first offset, through the switch and then be output after a first gain unit performed proportional conversion, or designated to undergo signal reduction with respect to a second offset and then be output after a second gain unit performed proportional conversion. The switch is switched on/off in the light of the working status of the pick-up head, for example, seeking or tracking, at a data area or at a blank, area, and at. a groove area or at a land area, so as to choose different offsets and gains to have the conversion of the servo signals. | 10-22-2009 |
20090279397 | CENTER ERROR MECHANICAL CENTER ADJUSTMENT - An apparatus comprising a center error creation circuit and a center error offset injection circuit. The center error creation circuit may be configured to generate a center error signal in response to light from a main laser reflected from a surface of an optical disc. The center error offset injection circuit may be configured to (i) determine a value of the center error signal when a lens in a sled housing is at a mechanical center and (ii) generate an offset signal based upon the value. The center error offset injection circuit generally measures an average value of the center error signal over a predetermined amount of time when a lens suspension which holds the lens in place is in a mechanical equilibrium state. | 11-12-2009 |
20110019512 | Optical disk reproducing device and optical disk recording and reproducing device - An optical disk reproducing device includes: a signal reproducing section configured to read and decode information recorded on an optical disk by an optical pickup unit, and reproduce the information, wherein the signal reproducing section includes a gain controlled amplifier circuit configured to amplify an radio frequency signal generated from a light receiving element, an automatic gain control circuit configured to control a gain of the gain controlled amplifier circuit, and a signal processing section configured to derive a part of an automatic gain control value generated in the automatic gain control circuit, and generate a control signal for adjusting one of an optical system path and a detection system path for controlling the optical pickup unit. | 01-27-2011 |
20110110205 | Apparatus for Controlling Servo Signal Gains of an Optical Disc Drive and Method of the Same - The invention provides an apparatus for controlling servo signal gains of an optical disc drive. The apparatus adjusts the gains of a plurality of servo signals controlling a servo system of the optical disc drive when the optical disk drive encounters an operating state transition. In a first mode, at least one AGC loop of the apparatus compensates the gains of the servo signals with a selectable bandwidth during a specific period after the operating state transition to accelerate the convergence of the servo signals. In a second mode, at least one AGC loop of the apparatus reloads the previously saved convergence values or pre-determined values as the initial values according to the current operating state immediately after the operating state transition to accelerate the convergence of the servo signals. | 05-12-2011 |
20110299373 | APPARATUS HAVING SWITCHABLE SERVO GAINS AND OFFSETS FOR OPTICAL DISK DRIVE AND METHOD THEREOF - An apparatus having switchable servo gains and offsets for an optical disk drive adjusts its gains and offsets through the coupling of a servo signal and a switch with several changeable paths. The servo signals are either designated to undergo signal reduction with respect to a first offset through the switch and then be output after a first gain unit performed proportional conversion, or designated to undergo signal reduction with respect to a second offset and then be output after a second gain unit performed proportional conversion. The switch is switched on/off in the light of the working status of the pick-up head, for example, seeking or tracking, at a data area or at a blank area, and at a groove area or at a land area, so as to choose different offsets and gains to have the conversion of the servo signals. | 12-08-2011 |