Class / Patent application number | Description | Number of patent applications / Date published |
369530220 | By detection of storage medium incident radiation | 52 |
20080232215 | Position Detector and Detected Element - As shown in FIG. | 09-25-2008 |
20080239910 | RECORDING MEDIUM TYPE DISCRIMINATION APPARATUS, RECORDING APPARATUS, AND DISCRIMINATION METHOD - According to the present invention, light is emitted by a light source at different emission intensities, and sensor output values are compared with threshold values at the individual emission intensities, so that the types of recording media having various reflection characteristics can be correctly determined. | 10-02-2008 |
20080247290 | Optical disc drive, optical storage medium, optical storage medium inspection apparatus, and optical storage medium inspection method - This optical disc drive has an optical pickup head that emits a light beam to an optical storage medium, detects the light beam reflected from the optical storage medium, and outputs a signal based on the received reflected light; a jitter measuring unit for measuring jitter in signals output from the optical pickup head; and an evaluation unit for determining from the measured jitter if the optical storage medium is good or defective. The jitter measuring unit measures jitter in a train of 3T or longer marks or spaces from an optical storage medium to which digital information is recorded as a train of marks or spaces of length kT based on a period T and an integer k of two or more. | 10-09-2008 |
20080253251 | Position Detection Device, Position Detection Method, Position Detection Control Device, Position Detection Control Method, Position Detection Control Program, Access Authentication Device, Access Authentication Method, Access Authentication Control Device, Access Authentication Control Method, Access Authentication Control Program, Information Storage Device, and Optical Disk - A position detection device, a position detection method, a position detection control device, a position detection control method, a position detection control program, an access authentication device, an access authentication method, an access authentication control device, an access authentication control method, an access authentication control program, an information storage device, and an optical disk are provided, all of which make it possible to prevent illegal copying of the information recorded in a recording medium. | 10-16-2008 |
20080291802 | OPTICAL DISC TYPE DETERMINING APPARATUS AND METHOD THEREOF - The present invention disclosed an optical disc drive determining apparatus. The optical disc drive determining apparatus includes an optical pick-up head, a signal processing module, and a discriminator. The optical pick-up head is for receiving a reflected signal from an optical disc. The signal processing module, coupled to the optical pick-up head, is for processing the reflected signal into a derived signal having a plurality of pulses. The discriminator, coupled to the signal processing module, is for analyzing widths of the pulses to determine a disc type of the optical disc. | 11-27-2008 |
20090010128 | Disc Identification Apparatus, Disc Insertion-Ejection Device, and Disc Device - A disc identification device, a disc insertion-ejection device and a disc device which can positively prevent two discs from being inserted into the apparatus. There is provided a disc thickness detection unit for electrically detecting a thickness of the discs inserted into an apparatus of the disc device, and there is provided a construction for judging whether the number of the discs inserted into the apparatus is one or plural, and it is electrically identified whether the number of the discs inserted into the apparatus is one or plural, and by controlling mechanisms on the basis of this identification result, the stable disc insertion and ejection can be achieved, and also damage to the mechanisms and the discs can be reduced. | 01-08-2009 |
20090010129 | Optical Disc Judgment Method and Optical Disc Device - An optical disk apparatus according to the present invention is an optical disk apparatus for performing at least one of: recording data to a plurality of types of optical disks including a recordable optical disk and a read-only optical disk which are produced according to the BD specifications; and reproducing data from the optical disks. This apparatus includes: a means ( | 01-08-2009 |
20090016185 | METHOD OF SETTING RECORDING SETUP INFORMATION ABOUT OPTICAL DISK, PROGRAM THEREFOR, AND DATA RECORDING PLAYER - There is disclosed a method of permitting recording setup information required to perform a test recording on an optical disk to be obtained from an external device as the need arises. The method comprises the steps of: measuring an evaluation index associated with recording characteristics with which data was recorded on the optical disk by an optical disk drive; making a decision as to whether the measured evaluation index indicates a state in which recording setup information used in data recording by the optical disk drive should be updated; acquiring recording setup information corresponding to at least the machine ID of the optical disk drive and the medium ID of the optical disk when the evaluation index is judged to indicate the state in which the recording setup information should be updated; and setting the acquired recording setup information in the optical disk drive. | 01-15-2009 |
20090028023 | OPTICAL DISC IDENTIFICATION APPARATUS AND METHOD OF IDENTIFYING OPTICAL DISC - An optical disc identification apparatus is disclosed. The optical disc identification apparatus includes an optic pickup unit and a control unit. The optic pickup unit has a plurality of laser sources. The optic pickup unit emits any of lasers to the optical disc and detects the reflected laser from the optical disc to transduce the reflected laser to a detection signal. The control unit controls the optic pickup unit to activate any of the laser sources and moves an object lens of the optic pickup unit. When the object lens moves, the control unit obtains a sectional width value of an S-curve of a focus FE signal according to the detection signal. The control unit repeats above steps to obtain the sectional width values of the S-curves of all the laser sources and identifies the optical disc according to all the sectional width values. | 01-29-2009 |
20090052291 | Composite reproducing apparatus - An optical disc reproducing device that composes a composite reproducing apparatus in accordance with the present invention includes an optical disc detecting portion which detects inserting and ejecting of an optical disc. The optical disc reproducing device also includes an identification information obtaining portion which obtains identification information to uniquely identify the optical disc from a management information recorded area of the optical disc. The identification information obtaining portion reads out the identification information and outputs it to a display device when inserting of the optical disc is detected by the optical disc detecting portion. An identification information recording portion which is included in the display device stores the identification information in a memory portion when the identification information is output from the optical disc reproducing device. Then an identification information display portion reads out the identification information and displays it on a display portion when it receives a command to display the identification information. | 02-26-2009 |
20090073838 | Optical Disc Media Type Confirmation Method - The present invention relates to a method for preventing a problem of collision between an optical system and a media by suggesting a method for confirming the kind of the medium prior to its operation in a drive having a compatibility with respect to a method for storing a near field optical information using SIL and a method for storing a remote field optical information below the existing blu-ray disk. The present invention can distinguish from an inserted optical disk if a compatible drive/pickup is in a near-field method, and confirm if the inserted optical disk is operable in a near-field method drive/pickup in advance, also. | 03-19-2009 |
20090080305 | DISC DISCRIMINATION METHOD AND APPARATUS - A method for discriminating a type of disc. The method includes receiving a signal having at least first and second peak points generated by an optical beam reflected from a record layer of the disc, comparing amplitudes of the first and second peak points, and determining the type of the disc based on a result of the comparing step. | 03-26-2009 |
20090080306 | OPTICAL DISK DEVICE AND OPTICAL DISK DISCRIMINATING METHOD - An optical disk discriminating method and an optical disk device which can detect reflected rays for making discrimination among kinds of optical disks with high accuracies. By switching a plurality of lasers and moving a spherical aberration corrector while moving an objective lens to cause it to approach or keep away from an optical disk, rays reflected light from the optical disk can be detected with high accuracies. Discrimination among the kinds of a plurality of optical disks can be made on the basis of signals generated from the detected reflected rays. This ensures that the kind of an optical disk can be determined through one operation of sweeping. | 03-26-2009 |
20090109820 | OPTICAL DISC DRIVE - An optical disc drive according to the present invention can read data from any of multiple types of optical discs, of which the information storage layers are located at mutually different depths under their surface. When this drive is loaded with an optical disc, the servo controller of the drive changes a first type of drive signal to adjust a focus position by changing distances from the lens to the disc and/or a second type of drive signal to adjust tilt of the lens by changing the angles defined by the lens with respect to the disc a number of times, thereby changing settings to be determined by a combination of the focus position and the tilt. A signal quality rater measures multiple index values to rate the quality of a reflected light signal as the settings are changed. Then, the optical disc drive recognizes the type of the given optical disc based on those index values and reads data from the optical disc recognized. | 04-30-2009 |
20090116356 | METHOD FOR RECORDING A VISUALLY DETECTABLE PATTERN ON AN OPTICAL RECORD CARRIER, APPARATUS FOR RECORDING A VISUALLY DETECTABLE PATTERN ON A RECORD CARRIER AND INSTRUCTION TO BE EXECUTED BY THE APPARATUS - An apparatus is described for recording a visually detectable pattern on a record carrier ( | 05-07-2009 |
20090262620 | METHODS AND DEVICES FOR DETECTING WOBBLES ON AN OPTICAL DISC - A device for detecting wobbles on an optical disc is provided, where the device is utilized for generating a wobble signal according to a plurality of detection signals. The device includes an analog signal processing circuit, a pair of analog-to-digital converters (ADCs), and a digital signal processing circuit. The analog signal processing circuit is arranged to perform analog signal processing on the detection signals to generate a plurality of output signals. In addition, the pair of ADCs are arranged to digitalize the output signals to generate a plurality of digital values. Additionally, the digital signal processing circuit is arranged to perform digital signal processing on the digital values and generate an arithmetic output, where the arithmetic output is utilized for generating the wobble signal or utilized as the wobble signal. An associated method for detecting wobbles on an optical disc is further provided. | 10-22-2009 |
20090296551 | TRANSITION SHIFT TIMING FOR OPTICAL SIGNAL - A method of determining the transition shift timing in a measured optical signal from an optical recording medium as well as applications of the method in connection with optimizing a write strategy and analyzing the write quality for an optical recording medium are disclosed. The method comprising the step of: providing values of a measured optical signal, providing modulation bits corresponding to the measured optical signal, calculating a model signal by means of an optical channel model, and determining an output timing of the leading and trailing edges from a mathematical model. The method being a recursive method which is continued until a predetermined criterion is fulfilled. The final output is the average transition shifts of the channel bits of the measured CA signal as they are on the optical recording medium. The applications of the method include but are not limited to: a module for determining the average transition shifts, an optical recording apparatus with means for adjusting the write strategy according to the average transition shifts, and an IC for controlling an optical recording apparatus. | 12-03-2009 |
20100014403 | METHOD AND APPARATUS OF DISCRIMINATING DIFFERENT TYPES OF OPTICAL DISCS - A method for discriminating different types of optical discs includes the steps of focusing a beam spot generated by a laser source on an optical disc, and rotating the optical disc; generating a radio frequency signal and a corresponding first signal of the radio frequency signal; comparing a peak-to-peak value of the corresponding first signal with a predetermined value; determining the optical disc as a high density optical disc when the peak-to-peak value of the first signal is smaller than the predetermined value; and, determining the optical disc as a low density optical disc when the peak-to-peak value of the first signal is greater than the predetermined value. | 01-21-2010 |
20100046341 | ADDITIONALLY RECORDABLE INFORMATION RECORDING MEDIUM, INFORMATION RECORDING METHOD, INFORMATION REPRODUCING METHOD, INFORMATION RECORDING APPARATUS AND INFORMATION REPRODUCING APPARATUS - An additionally recordable information recording medium has a complicated management structure for managing an unrecorded area. Therefore, there are problems that it takes a long time for a disk to startup and it is difficult to build a recording/reproducing system. The additionally recordable information recording medium according to the present invention includes a simple data structure for managing a location information for a recorded area located at the rearmost location in a user data area. An additionally recordable apparatus according to the present invention also includes means for updating the location information of the recorded area so that the recorded area located at the rearmost location in the user data area is always managed. | 02-25-2010 |
20100085854 | OPTICAL DISC DISCRIMINATING METHOD AND OPTICAL DISC DISCRIMINATING APPARATUS - An optical disc discriminating method and an optical disc discriminating apparatus which can discriminate a type of optical disc with a simple configuration, causes a drive means to vary an incident angle of a laser light beam with respect to an optical disc while irradiating the optical disc with the laser light beam from a light beam generating section, causes a photodetector to detect a diffraction light of the laser light beam from a recording track of the optical disc, detects a value corresponding to the incident angle when the diffraction light is detected, and discriminates the type of the optical disc on the basis of the detected value. | 04-08-2010 |
20100118676 | OPTICAL DISC DRIVE WITH DELAYED LAYER JUMP - An optical disc drive ( | 05-13-2010 |
20100157763 | Optical Disk Drive and Method for Determining Disk Type - An optical disk drive for determining a disk type associated with a substrate thickness of an optical disk comprising a substrate is provided to comprise a source to generate a beam, an optical arrangement arranged to direct the beam to the optical disk for forming an incident beam, a sensor arranged to sense a reflected beam and to produce a sensor output signal, a focus system comprising an objective lens system and a focus controller, wherein the objective lens system is arranged to focus the incident beam into a spot, and the focus controller is arranged to generate a focus control signal to drive and position the objective lens system; and a controller arranged to cooperate with the focus controller for moving the objective lens system, to receive the central aperture signal during the movement of the objective lens system, to analyze the central aperture signal for determining the focus actuator position, and to determine the disk type associated with the substrate thickness. | 06-24-2010 |
20100182885 | METHOD FOR DISCRIMINATING OPTICAL DISC, OPTICAL DISC DEVICE AND PROGRAM - Provided is a method for easily discriminating that a disc is a blank disc that conforms to the DVD Download standards. An optical disc device is provided with a first identifying means ( | 07-22-2010 |
20100188952 | STAMPER AND STAMPER EVALUATION METHOD - According to one embodiment, this invention determines whether a maximum value Hmax and minimum value Hmin of an HF signal obtained when a data recording portion is irradiated with a laser having a wavelength of 450 nm or less and an NA of 0.6 or more meet (Hmax−Hmin)/Hmax<0.13 . . . (1), or whether a maximum value Hmax, a minimum value Hmin, and a most frequent voltage value Have of a signal level of an HF signal obtained when a data recording portion is irradiated with a laser having a wavelength of 450 nm or less and an NA of 0.6 or more meet Hmax/Have≦1.05 . . . (2) and Hmin/Have≦0.90 . . . (3). | 07-29-2010 |
20100246356 | DISK SURFACE DEFECT INSPECTION METHOD AND APPARATUS - The present invention provides a disk surface defect inspection method including: irradiating a laser beam from an oblique direction onto a disk surface being rotated; detecting intensities of a first light that is scattered with low-angle and a second light that is scattered with high-angle from minute concave and convex defects; determining that a defect is the minute convex defect if a ratio of the intensity of the first light to the intensity of the second light is constant; and determining that a defect is the minute concave defect if the ratio of the intensity of the first light to the intensity of the second light is changed. | 09-30-2010 |
20110158070 | Optical Disk Drive and Method for Determining Type of a Blu-Ray Disk - The invention provides a method for determining the layer type of a blu-ray disk. First, a laser beam is focused on a target layer of the blu-ray disk. Reflection of the laser beam from the target layer is the detected to obtain a reflection signal. The reflection signal is then processed to generate a first tracking error signal and a second tracking error signal. Magnitudes of the first tracking error signal and the second tracking error signal are then measured. The magnitude of the second tracking error signal is then subtracted from the magnitude of the first tracking error signal to obtain a difference value. Finally, the layer type of the target layer is determined by comparing the difference value with the first predetermined threshold. | 06-30-2011 |
20110235487 | RECORDING QUALITY EVALUATION METHOD OF OPTICAL DISK AND OPTICAL DISK STORAGE SYSTEM - There is provided a method of calculating the degradation over time of the quality of data recorded on an optical disk in a short time. In the method, when user data is recorded on a data area, a test signal including a component in which the signal level is smaller than a reference value, is recorded on a test area. Then, the test signal is reproduced from the test area when a predetermined time has passed, to calculate the quality degradation of the user data from the evaluation result. Alternatively, every time when the user data is recorded/reproduced on/from the data area, the test signal is recorded/reproduced repeatedly on/from the test area. Then, the test signal is reproduced from the test area at a predetermined timing, to calculate the quality degradation of the user data from the evaluation result. | 09-29-2011 |
20110310717 | METHOD AND APPARATUS FOR DETERMINING THE NUMBER OF DATA LAYERS IN AN OPTICAL DISC - The present invention provides a method and an apparatus for determining the number of data layers in an optical disc. Firstly, the objective lens of the optical pickup head is controlled so that it moves toward the optical disc. At the same time, a generated SBAD signal is recorded. The number of wave peaks in the SBAD signal is then detected and the number of the data layers in an optical disc is determined according to the detected number of wave peaks in the SBAD signal. | 12-22-2011 |
20120044794 | DISCRIMINATION METHOD OF OPTICAL DISC - A discrimination method of an optical disc. The method includes: focusing a light spot on a rewritable zone of the optical disc; reading an EFM signal of data marks of the optical disc to check if the optical disc is a data disc or a blank disc; when the optical disc is a data disc, utilizing an SBAD signal for discrimination of the optical disc; when the optical disc is a blank disc, utilizing a DPD signal for discrimination of the optical disc; checking if the header signals exist or not; identifying the optical disc as a DVD-RAM disc if the header signals exist; and identifying the optical disc as a DVD-RW disc if there is no header signal. In this way, the accuracy of the optical disc discrimination is enhanced. | 02-23-2012 |
20130016596 | OPTICAL STORAGE MEDIUM WITH OPTICALLY DETECTABLE MARKS - Optically detectable marks readable by a wide range of optical systems are included on an optical storage medium. Among other uses, the marks may be used to determine the type of the optical storage medium in an optical device capable of reading multiple types of optical storage media. | 01-17-2013 |
20140211601 | QUALITY EVALUATION METHOD, INFORMATION RECORDING MEDIUM, OPTICAL DISC DEVICE AND RECORDING/REPRODUCING SYSTEM - When data is recorded on an optical disc, and stored for a long period of time, there is a need to periodically evaluate whether a quality of the recorded data is determined with time, or not. If the signal quality is lower than a given level as an evaluation result, a work for moving the data to a brand-new optical disc is required. However, in periodical inspection, if the number of optical discs is enormous, a large amount of time is required to evaluate all data recorded on the optical disc. In recording user data on the optical disc, a signal of a particular pattern having a lifetime shorter than a reference lifetime of the user data is recorded in a given area of the optical disc in advance, the particular pattern signal is reading at given time intervals, and processing on the user data is determined on the basis of the evaluation result of the signal quality. | 07-31-2014 |
369530230 | Derived focusing or tracking related signal | 21 |
20080205229 | METHOD OF IDENTIFYING OPTICAL DISC - A method of identifying an optical disc is disclosed. The method includes enabling an optical pick-up unit to emit a first laser beam having a first wavelength to the optical disc; controlling the optical pick-up unit to move a focus point of the first laser beam in a direction of thickness of the optical disc; obtaining a first focus error (FE) signal corresponding to the first laser beam; counting a first s-curve number corresponding to s-curve occurring in the first FE signal; and identifying the optical disc according to the first s-curve number. | 08-28-2008 |
20080219121 | METHOD OF VERTICAL DEVIATION DISC DETECTION - A method for detecting whether vertical deviation of an optical disc occurs is provided. First, before a pickup head is successfully focused on the optical disc, a pickup head is actuated based on an input control signal so as to generate a focus error signal with a plurality of S-curves. Then, a plurality of zero crossing points of the S-curves in the focus error signal is identified and a plurality of input control values respectively corresponding to the zero crossing points is obtained. A variation of the input control values is then calculated. Whether vertical deviation of the optical disc occurs can be determined according to the variation of the input control values. | 09-11-2008 |
20080232216 | Focus Control Scheme with Jumping Focal Point - The present invention relates to a focus control apparatus and method of controlling focus of a radiation beam onto a first spatial level of a record carrier, wherein a focus control loop is locked onto a reflection signal obtained from a second spatial level located at a predetermined distance from said first spatial level, and is then opened to move an objective means towards the second spatial level by a predetermined amount related to the predetermined distance. This stepwise procedure enlarges the margin for mechanical overshoot and hence reduces the risk of bumping into the disc. Additionally, no ambiguous focus error signals are detected and robustness of initial focusing is improved if a thin transparent cover layer is present. | 09-25-2008 |
20080239911 | Parameter Variation Before Closing Radial Control Loop - The invention relates to a method of optimizing an optical drive system | 10-02-2008 |
20080247291 | Optical disc type determining method and optical disc device - Whether an optical disc is a first optical disc or not is determined with reference to at least one of first and second focus error signal amplitude values. Then, if a sum value of the addition of a first focus balance signal value (CD-FBAL signal value) to a second focus balance signal value (DVD-FBAL signal value) is equal to or more than a predetermined threshold value, the signal surface of the optical disc is determined to be a CD signal surface of a dual disc. On the other hand, if the sum value is smaller than the predetermined threshold value, the signal surface of the optical disc is determined to be a DVD signal surface of a DVD or a DVD signal surface of a dual disc. | 10-09-2008 |
20090040893 | Optical pickup device and optical disk device - An optical pickup device or an optical disk device includes: a light source | 02-12-2009 |
20090040894 | Optical Head And Data Processing Apparatus Including The Same - An optical data processing apparatus reads and/or writes data from/on a data storage medium, in which first and second data storage layer are stacked. The apparatus includes: a light detector including at least one photodetector for generating a light quantity signal; a detecting optical system for guiding reflected light beams from a storage layer; and a signal processor for generating a layer sensing signal from the light quantity signal and determining, by the layer sensing signal, the type of data storage medium. The light detector includes a layer sensing photodetector arranged in view of an of an area of the light detector, and further includes a photodetector which is different from the layer sensing photodetector which receives the reflected light beam to generate a focus signal. | 02-12-2009 |
20090059753 | OPTICAL DISK APPARATUS AND METHOD OF DRIVING THE SAME - An optical disk apparatus includes a light focusing element arranged to face a disk and to focus light emitted from a light source on the disk, an actuator to move the light focusing element towards and away from the disk according to an actuator driving voltage, a light intensity detection unit to detect an intensity of light reflected by the light focusing element and generate a gap error signal based on the detected intensity, a servo unit to generate the actuator driving voltage and a predetermined threshold voltage based on the gap error signal generated by the light intensity detection unit and to provide the actuator driving voltage to the actuator, a distance detection unit to detect a first distance at which the actuator driving voltage is maintained when the threshold voltage is detected using the gap error signal and to detect a second distance at which a gap between the light focusing element and the disk is shorter than the first distance and at which a gap servo operation is started based on the gap error signal; and a control unit to control the servo unit to start the gap servo operation based on the detected first and second distances. | 03-05-2009 |
20090059754 | OPTICAL DISK DEVICE - An optical disk device includes an optical pickup, a focus drive section, a detection section, a time measurement section and a disk identification section. The detection section detects reflected light reflected from an optical disk while the focus drive section moves a focus position of the optical pickup. The time measurement section measures a focus search time between when the reflected light reflected from a disk surface of the optical disk is detected and when the reflected light reflected from an information recording layer of the optical disk is detected. The time measurement section measures a false reflection search time between when the reflected light reflected from the disk surface is detected and when false reflection light is detected. The disk identification section calculates a ratio of the focus search time to the false reflection search time, and identifies a type of the optical disk based on the ratio. | 03-05-2009 |
20090059755 | Method for adjusting a focus position on an optical disc and an optical disc apparatus applying the same therein - In a method for adjusting a focus position for an optical disc, onto/from which in formation is recorded or reproduced, while adjusting the focus position of an optical reproducing means, upon a recording surface of an optical information recording medium having an area where information of the optical information recording medium is recorded in advance, comprising the following steps of: memorizing plural numbers of information relating to focus positions determined appropriately, which can be obtained from the area where the information of the optical information recording medium is recorded in advance; and adjusting the focus position for the optical disc loaded into an apparatus, from at lease one (1) signal relating to the focus position, which can be obtained from the optical disc, with utilizing a relationship between the plural numbers of information relating to the focus positions determined appropriately, memorized in advance, when reproduction of the information is impossible when the optical disc is loaded into the apparatus, thereby providing the focus position adjusting method and an optical disc apparatus applying the same therein, for enabling an appropriate focus adjustment even in case when DMA area cannot read out due to damages or defects therein. | 03-05-2009 |
20090067307 | Recording Device and Method, Reproducing Device and Method, Recording/Reproducing Device and Method, and Computer Program - A recording device ( | 03-12-2009 |
20090092020 | Focus servo controlling method and apparatus and optical disk drive using the focus servo controlling method - A method and apparatus for controlling a focus servo of an optical disk drive is provided. The focus servo controlling method includes the operations of, when an operating mode enters into a focus pull-in mode, detecting a period of time that satisfies a first threshold condition, the first threshold condition set to determine a duration in which a focal point of an optical signal emitted from a pickup is passing through a cover layer of a disk, the determination made by using a first signal proportional to a detected portion of an optical signal reflected by the disk, and preventing focus servo control from being performed during a detected period of time that first satisfies the first threshold condition since the operating mode entered into the focus pull-in mode. | 04-09-2009 |
20090122678 | DEVICE AND METHOD FOR GENERATING TRACK-CROSSING SIGNAL IN OPTICAL DISC DRIVE - A track-crossing signal generator includes a bottom envelope detecting unit, a defect detector, an auto gain control unit, and an amplifier. The bottom envelope detecting unit receives a radio frequency signal, and outputs a bottom envelope signal. The defect detector is electrically connected to the bottom envelope detecting unit for receiving the bottom envelope signal and generating a defect signal when a defect area is formed on a disc track. The auto gain control unit is electrically connected to the bottom envelope detecting unit for receiving the bottom envelope signal and dynamically adjusting a gain value according to the amplitude of the bottom envelope signal. The amplifier is electrically connected to the bottom envelope detecting unit and the auto gain control unit for receiving the bottom envelope signal and dynamically adjusting the bottom envelope signal according to the gain value, thereby amplifying the bottom envelope signal as a track-crossing signal. | 05-14-2009 |
20090290465 | GAP PULL-IN METHOD FOR NEAR-FIELD OPTICAL DISK DRIVER AND OPTICAL DISK DRIVING APPARATUS USING THE METHOD - A gap pull-in method that minimizes overshoot due to a moving speed of a light focusing element and disturbance of a disk when the light focusing element is converted from an open loop state to a closed loop state during a gap pull-in of a near-field optical disk driver, and an optical disk driving apparatus using the method, the gap pull-in method including: generating an inverse actuator driving signal having a pulse duration and a pulse amplitude according to a moving speed of a light focusing element when an open loop state is changed to a closed loop state in the gap pull-in; and driving an actuator using the inverse actuator driving signal. | 11-26-2009 |
20100034069 | METHOD FOR CONTROLLING FOCUS LOOP OF AN OPTICAL STORAGE DEVICE - A method for controlling focus loop of an optical storage device includes: moving a lens of an optical pick-up head in a first moving direction; performing a focusing operation when a first S-curve sequence appears in a focus error signal; and when a light beam generated from the optical pick-up head is not focused on an optical disc, performing the focusing operation when a second S-curve sequence appears in the focus error signal; wherein the first S-curve sequence and the second S-curve sequence appear in the focus error signal during one revolution of the optical disc. | 02-11-2010 |
20100226229 | OPTICAL PICKUP DEVICE - In a multilayer disc has an increased number of recording layers) spaced by spacing from each other, a generation interval between focus error (FE) signals detected from the respective recording layers becomes small. This causes mutual interference between the FE signals and a resulting undesired offset and the like in the signals, leading to a significantly deteriorated quality of the FE signals. To avoid this, in an optical pickup device according to the present invention, detection surfaces are newly added at positions adjacent to the FE signal detection surfaces, a predetermined detection signal obtained from the newly-added detection surfaces is multiplied by a predetermined coefficient value depending on the spacing between the recording layers, and the multiplied signal is subtracted from the original FE signal. As a result, mutual interference between the FE signals can be remarkably reduced. | 09-09-2010 |
20110176402 | FOCUS CONTROL APPARATUS, FOCUS CONTROL METHOD, OPTICAL PICKUP APPARATUS, DRIVE APPARATUS, AND OPTICAL RECORDING MEDIUM - [PROBLEMS] To perform highly accurate focus control in an optical recording medium of multilayer structure having an interface of each layer with a reflectance reduced as much as possible. | 07-21-2011 |
20110205877 | OPTICAL DISC DRIVE AND METHOD FOR READING DATA FROM OPTICAL DISC - An optical disc drive according to the present invention is designed to read data from a multilayer optical disc | 08-25-2011 |
20110317533 | RECORDING AND REPRODUCING APPARATUS AND LASER DRIVING PULSE ADJUSTING METHOD - A recording and reproducing apparatus includes: an optical head unit irradiating a laser beam on an optical recording medium and performing writing and readout of information represented by marks and spaces on the medium; a laser-driving-pulse generating unit generating and supplying a laser driving pulse to the head unit, and causing the head unit to execute laser beam irradiation; an evaluation-value measuring unit measuring an evaluation value representing an error of an edge position of the mark; and a control and calculating unit causing the apparatus to separately execute, concerning mark lengths to be adjusted among mark lengths of the laser driving pulse, for each set of mark lengths grouped in advance, trial writing with shift amounts of edge positions of a laser driving pulse concerning the lengths belonging to the set changed, causing the apparatus to execute readout of a signal recorded by the execution of the trial writing, causing the measuring unit to measure an evaluation value under setting of the respective shift amounts, and obtaining an optimum edge shift amount of the laser driving pulse for each of the lengths to be adjusted. | 12-29-2011 |
20120250481 | DISC DEVICE - Provided is an optical disc drive device which stably controls an actuator of an optical pickup, by individually controlling an optical spot when following the guide track and an optical spot when recording/reproducing information on/from each recording layer. An optical spot when following the guide track and an optical spot when recording/reproducing information on/from each recording layer are individually controlled. At this time, the optical spot exclusive for the track and the optical spot exclusive for the recording/reproducing are formed on an optical disc. | 10-04-2012 |
20130077456 | OPTICAL PICKUP AND OPTICAL READ/WRITE APPARATUS - In one embodiment, an optical pickup includes an optical system which forms multiple light beams based on the light emitted from a light source and which converges a write beam and a read beam, thereby forming a main spot and a sub-spot, respectively, on an optical storage medium. This optical system converges the write and read beams onto the optical storage medium so that the main spot moves through the same region on the optical storage medium ahead of the sub-spot. The optical pickup further includes a detector for sensing the write and read beams reflected from the storage medium. The detector includes a first photodiode | 03-28-2013 |