Class / Patent application number | Description | Number of patent applications / Date published |
369530250 | Of transducer assembly mechanism | 67 |
20080205230 | Speed-Down During Linking - In the invention herein a recordable optical disc is provided with embossed windings of a spiral track or circular tracks in a recording layer of phase change material and with embossed address/timing information located between adjacent windings. User data is received for recording on the disc. The data is written by controlling a laser beam scanning the winding to form marks of different phases of the phase change material at a higher disc speed while reading an address from the disc. The writing is occasionally interrupted in order to calibrate write parameters in order to improve the write quality. After the calibration linking is performed by jumping to a position just before the writing was interrupted, and determining the current position depending on an address read from the disc, and tracking to the position that the writing was interrupted. When an error occurs in reading the address information from the disc during linking at a higher disc speed, then the disc speed is reduced to a lower disc speed and linking is performed at the slower disc speed. After successful linking, writing of the user data continues at the lower disc speed or the disc speed is increased and writing continues at the higher disc speed. | 08-28-2008 |
20080291803 | Optical pickup device - An optical pickup device has a spherical aberration correction mechanism and a control part performing a process for determining setting of the spherical aberration correction mechanism. The process includes an objective lens moving process of moving an objective lens with respect to an optical recording medium, a checking process of checking in which shift direction the timing when the reflection light quantity signal becomes a peak is shifted from the timing when an S-shaped curve of a focus error signal crosses zero by using the reflection light quantity signal and the focus error signal derived from a recording layer on which information is read or written obtained by the objective lens moving process, and a setting changing process of changing current setting of the spherical aberration correction mechanism in accordance with the shift direction checked in the checking process in the case where it is decided that setting of the spherical aberration correction mechanism should be changed from the current setting. | 11-27-2008 |
20080298192 | Method and System for Adjusting the Pitch of Light Spots Used to Read an Information Carrier - The invention relates to a method and system for adjusting the pitch of an array of light spots ( | 12-04-2008 |
20090080307 | Method of manufacturing optical head including the step of adjusting parallelism of light beam - A method for manufacturing an optical head having a laser beam emitting device that emits a light beam of a predetermined wavelength, an objective lens that focuses the light beam on an optical recording medium and a parallelism adjusting lens that is disposed on an optical path between the laser beam emitting device and the objective lens, wherein the parallelism adjusting lens is configured to change parallelism of the laser beam, is disclosed. The method comprise the step of adjusting the parallelism of the light beam that has passed through the parallelism adjusting lens by adjusting a distance between the laser beam emitting device and the parallelism adjusting lens while causing the laser beam emitting device to emit the light beam and causing the light beam to pass through the parallelism adjusting lens. | 03-26-2009 |
20090252011 | OPTICAL INFORMATION RECORDING/ REPRODUCING DEVICE AND OPTICAL INFORMATION RECORDING/ REPRODUCING METHOD - An optical information recording/reproducing device includes a liquid optical element containing a liquid crystal polymer layer in an optical head. A liquid crystal optical element drive unit drives a liquid crystal optical element having a first pattern electrode divided into a plurality of region at one side of the liquid crystal polymer layer in the optical axis direction. The first pattern electrode includes a first region arranged to surround the optical axis and second to ninth regions arranged outside the first regions in such a manner that the circumference is divided eight portions. The liquid crystal optical element drive unit applies a first effective voltage to the first region, a second effective voltage to the second and the sixth region, a third effective voltage to the third and the seventh region, a fourth effective voltage to the fourth and the eighth region, and a fifth effective voltage to the fifth and the ninth region. An average value of the second and the fourth effective voltage and an average value of the third and the fifth effective voltage are identical to the first effective voltage. The voltage applied to the respective regions of the pattern region of the liquid crystal optical element is decided in a short time so as to optimize the quality of the reproduction signal. | 10-08-2009 |
20090310457 | Optical Disk Recording Apparatus, Laser Diode Driving Apparatus and Recording Signal Generating Apparatus - The optical disk recording apparatus has the function of correcting the timing shift of the write strategy signal caused by the change in the operating environment of the digital signal processing circuit including the write strategy generating circuit, the laser drive circuit for driving the laser at the time of recording and the flexible printed board for electrical connection between the digital signal processing circuit and the laser drive circuit. Upon determination that the timing shift correction is required, the timing shift is reduced by operating the timing shift correcting function. | 12-17-2009 |
20110002210 | METHOD FOR CALIBRATING ACTUATOR - A method for calibrating an actuator is provided. A reflective reference surface is set. An objective lens is shifted to several calibration positions along the tracking direction in the actuator, focusing is performed at each position, and the shift volt and the focus volt are recorded. The focus volt at a calibration position is set as a standard focus volt, and the focus volt bias at the other calibration position with respect to the standard focus volt is calculated. A focus volt bias curve is formed by curve-fitting the focus volt bias and the shift volt at each calibration position, and a focus volt bias is obtained to compensate the volt along the focusing direction. | 01-06-2011 |
20110038243 | METHOD FOR CALIBRATING OFFSET OF MICRO ACTUATOR - A method for calibrating the offset of a micro actuator includes: setting a reference reflective plane with different focus voltage levels; focusing on test points on the reference reflective plane and recording the tracking voltages; selecting a standard focus voltage level; calculating the offset of the tracking voltage for each test point; curve-fitting the offsets into a tracking voltage curve for each focus voltage level; and acquiring an offset of a selected tracking voltage by interpolation or extrapolation to calibrate the selected tracking voltage. | 02-17-2011 |
20110090777 | OPTICAL REPRODUCING APPARATUS CONNECTABLE TO OPTICAL PICKUPS AND METHOD OF CONTROLLING OPTICAL PICKUPS - An optical reproducing apparatus connectable to optical pickups and a method of controlling an optical pickup thereof are provided. The optical reproducing apparatus measures resistance of an optical pickup on a port of a connection unit to which the optical pickup is connected, and determines the type of the optical pickup according to the measured resistance. Accordingly, optical reproducing apparatuses may be controlled according to the type of optical pickups, and manufactured using various optical pickups without checking the type of optical pickups, which allows convenient manufacturing of optical reproducing apparatuses. | 04-21-2011 |
20110280115 | TILT ANGLE ADJUSTMENT METHOD FOR OBJECTIVE LENS AND OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS - A method for adjusting a tilt angle of an objective lens with respect to one of a multilayer optical disc having a plurality of recording layers and an optical axis of an optical information recording/reproducing apparatus, wherein a use wavelength λ and a numerical aperture NA are defined by conditions: 390<λ<420 and 0.7511-17-2011 | |
20120092978 | OPTICAL DISK DRIVE WITH EMBEDDED TEST MEDIUM - Embodiments provide an optical disk drive that includes an embedded test medium for testing the optical performance of an optical head in the optical disk drive. | 04-19-2012 |
20120263027 | METHOD FOR DETERMINING PHASE DIFFERENCE OF TRACKING ERROR SIGNAL - A method for determining a phase difference of a tracking error signal is provided. The method includes: predetermining a plurality of phase differences, measuring MPP and SPP signals, establishing a phase difference curve by use of an amplitude ratio between (MPP+SPP) and (MPP−SPP), measuring MPP and SPP signals for a tracking error signal under test, calculating the amplitude ratio (MPP+SPP)/(MPP−SPP), and comparing with the phase difference curve to promptly determine the phase difference. | 10-18-2012 |
20130265863 | THERMALLY ASSISTED MAGNETIC RECORDING HEAD INSPECTION METHOD AND APPARATUS - In a method and an apparatus for inspecting a thermally assisted magnetic recording head element, a specimen is mounted on a table movable in a plane of a scanning probe microscope device, evanescent light is generated from a portion of light emission of evanescent light of the specimen, scattered light of the evanescent light is detected by moving the table in the plane while a cantilever of the scanning probe microscope having a probe is vertically vibrated in the vicinity of a surface of the specimen, and an intensity distribution of the evanescent light emitted from the portion of light emission of evanescent light or a surface profile of the portion of light emission of evanescent light of the specimen is inspected using position information of generation of the evanescent light based on the detected scattered light. | 10-10-2013 |
20130336099 | HOLOGRAPHIC OPTICAL PICKUP DEVICE, OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE, AND METHOD OF REPRODUCING OPTICAL INFORMATION - A holographic optical pickup device includes an optical axis split element for splitting a reference beam into two light beams in different propagation directions having polarized states substantially orthogonal to each other, angular variable elements for changing incident angle of the reference beam for irradiating an optical information recording medium, an image sensor for detecting a diffracted beam generated from a recorded region upon irradiation of the optical information recording medium with the reference beam to form a reproduction signal, and photodetectors for detecting the diffracted beam generated from the recorded region upon irradiation of the optical information recording medium with the reference beam. An angular error signal is generated for controlling the angular variable element using signals detected by the photodetectors. | 12-19-2013 |
369530260 | Energy producing device | 19 |
20080273436 | Integrated Photo Monitor Circuit and Optical Pickup Unit - The invention provides an integrated photo monitor circuit ( | 11-06-2008 |
20090285072 | METHOD FOR MONITORING AN OPTICAL DISK DRIVE PERFORMANCE QUALITY, OPTICAL DISK DRIVE, OPTICAL DISK DUPLICATOR SYSTEM AND COMPUTER PROGRAM PRODUCT - The invention relates to a method for monitoring an optical disk drive performance quality by determining a laser diode quality indicator for a laser diode arranged in an optical disk drive for scanning an optical disk. The determining includes measuring ( | 11-19-2009 |
20100165813 | OPTICAL RECORDING APPARATUS WITH HIGH-SPEED FORWARD LASER POWER CONTROL (LPC) - The invention relates to an optical recording apparatus on optical carrier or disk, the apparatus has means for sampling a power level of an irradiation beam, e.g. a laser beam, that is capable of recording data in a data region ( | 07-01-2010 |
20100278026 | OPTICAL INFORMATION RECORDING MEDIUM REPRODUCING DEVICE, AND OPTICAL INFORMATION RECORDING MEDIUM - An optical information recording medium reproducing device ( | 11-04-2010 |
20110075538 | OPTICAL RECORDING CONDITION SETTING METHOD, OPTICAL RECORDING/REPRODUCING DEVICE, CONTROL PROGRAM, AND RECORDING MEDIUM - In order to provide an optical recording condition setting method which reduces effects from uneven properties of a rewritable or recordable optical disk and an optical recording/reproducing device, and to provide an optical recording/reproducing device which executes the method, (i) a test writing is carried out with respect to an optical disk under various settings of recording-power parameters for use in forming a shortest record-mark (S | 03-31-2011 |
20110170391 | SYSTEM AND METHOD FOR CONTROLLING TRACKING IN AN OPTICAL DRIVE - The present techniques provide methods and systems for alignment of a read head with data tracks on an optical data disk. In embodiments, a multi-pixel detector that is segmented into multiple areas, or detector segments, may be used to detect a pattern in the light reflected from an optical data disk. The detector system may then combine the quantized values from each of the detector segments mathematically to determine the alignment of the read head with a target data track. If the read head drifts to one side or the other, detectors to the side of a center detector may start to pick up energy from the adjacent tracks. If this energy is continuously summed for the detectors on each side, the read head may be centered by balancing the sums from the detectors on each side. | 07-14-2011 |
20110235488 | Super-Resolution Optical Disc Reader and Read Method Optimized Through Amplitude Measurement - The invention relates to the field of the optical recording of information on a medium, such as an optical disc. To read an optical disc in super-resolution mode, a procedure for optimizing the power of the read laser beam is implemented. This optimization is based on the observation that a correlation exists between the power allowing the disc to be read without risk in super-resolution mode and the amplitude of the read signal which results from the reading of marks having the smallest possible dimension (marks 2 T). The amplitude of the optical disc is measured for several powers of decreasing values of the read laser, the reduction in amplitude is observed. A read power is selected as a function of the power for which a decrease (for example 5%) is noted in the amplitude measured at the start. | 09-29-2011 |
20110317534 | OPTICAL DISC REPRODUCTION POWER SETTING METHOD, OPTICAL DISC REPRODUCTION METHOD, AND OPTICAL DISC DEVICE - According to a method for setting the laser beam power applied to reproduce information recorded on an optical disc, information recorded in a region on the optical disc is reproduced using three or more test reproduction powers (S | 12-29-2011 |
20120008477 | OPTICAL DISC DRIVE AND METHOD OF CONTROLLING LASER LIGHT POWER IN OPTICAL DISC DRIVE - This invention provides an optical disc drive with more accurate and stable power control for a laser light source. An optical disc drive in an embodiment of this invention includes a monitor photodetector for receiving laser light emitted by a laser light source to monitor the laser light power. The monitor diode is a photodetector for generating an electric signal corresponding to the laser light power. A laser light controller controls drive current to the laser light source based on a result of measurement by the monitor diode. The optical disc drive measures output variations of the monitor diode and controls the gain of the monitor diode based on the result of the measurement. This gain control improves accuracy and stability in laser light control so that stability in recording/reading can be attained. | 01-12-2012 |
20120008478 | OPTICAL DISC DRIVE AND METHOD OF CONTROLLING POWER OF LASER LIGHT IN RECORDING TO OPTICAL DISC - This invention provides accurate control of laser light power in a recording operation to achieve more stable recording operation. An optical disc drive in an embodiment of this invention monitors the power of laser light with a monitor diode and controls the laser light power based on the result of monitoring. The optical disc drive changes data transfer rate (recording frequency) depending on the disc radial position. The optical disc drive controls the gain of the monitor diode across the recording surface depending on the recording frequency. This control improves the accuracy in laser light power control to achieve stable recording operations by precise servo control. | 01-12-2012 |
20120075974 | RECORDING POWER CALIBRATING METHOD FOR IMPROVING SEEKING STABILITY ON RECORDING POWER CALIBRATION AREA - In an optimal recording power calibration method for improving seeking stability on a recording power calibration area, a specific area serves as a data recording area during an optimal recording power calibration, wherein a length of the specific area is such that a plurality of times of optimal recording power calibrations can be performed. The method includes: an optimal recording power calibration step of recording, with different recording power, a first length of calibration data in the specific area, and calibrating optimal recording power, wherein a data sector recorded in this step is defined as a calibration recording sector; and a data recording step of recording, with data recording power, a second length of information having a logical address beside the calibration recording sector of the specific area, wherein a data sector recorded in the step is defined as an information recording sector. | 03-29-2012 |
20120155237 | Optical Information Record/Playback Device - An optical information record/playback device of the present invention includes: a light source; a current driver for supplying current to the light source; an optical system for condensing light from the light source onto a recording medium; a monitoring section for monitoring light emission power of the light source; a current driver control section for controlling output current of the current driver; and an arithmetic/control section for controlling an operation of the current driver control section. Before recording information, the arithmetic/control section sequentially conducts a first test light-emission to cause the light source to emit light by using a closed loop circuit and a second test light-emission to cause the light source to emit light by using an open loop circuit, and compares first and second sampling values, which are respectively obtained by sampling the outputs of the monitoring section during the first and second test light-emissions. | 06-21-2012 |
20120300605 | CIRCUIT FOR PREVENTING DESTRUCTION OF SEMICONDUCTOR LASER ELEMENT, AND OPTICAL DISC DEVICE PROVIDED WITH THE CIRCUIT - A circuit for preventing destruction of a semiconductor laser element of an optical disc device comprises a light-emission-directing circuit part for outputting a light-emission-directing signal for directing the semiconductor laser element to emit light; a voltage-monitoring circuit part for monitoring a light-emitting voltage and, when a judgment is made that the light-emitting voltage is normal, outputting a light-emission-permitting signal for permitting the semiconductor laser element to emit light, the light-emitting voltage being supplied from a power source for the semiconductor laser element to an optical-output-controlling circuit part in order to cause the semiconductor laser element to emit light; and a light-emission-permitting circuit part for using the optical-output-controlling circuit part to cause the semiconductor laser element to emit light only when the light-emission-directing signal and the light-emission-permitting signal are inputted. | 11-29-2012 |
20130083640 | OPTICAL READ/WRITE APPARATUS - Disclosed is an improved DRAW technique for writing data on an optical storage medium and reading the data in parallel. In obtaining the optical power of a first light source | 04-04-2013 |
20130135977 | OPTICAL PICKUP APPARATUS - An optical-pickup apparatus includes: a first laser-light source to emit a first laser beam to a first optical disc; a first photodetector to output a first monitor signal indicative of intensity of the first laser beam; a second laser-light source to emit a second laser beam to a second optical disc; a second photodetector to output a second monitor signal indicative of intensity of the second laser beam; a signal-selection unit to select the first monitor signal when recording or reading of information is performed for the first optical disc, and select the second monitor signal when recording or reading of information is performed for the second optical disc; and a signal-transmission unit to transmit, via a common transmission path, the first monitor signal or the second monitor signal selected by the single-selection unit to a control circuit configured to control intensity of the first laser and second laser beams. | 05-30-2013 |
20130163396 | DEVICE AND METHOD FOR WRITING DATA TO AN OPTICAL DISC - Provided are a method of optical writing on a disc and a device adopting the method. The method of optical writing includes initially driving a laser diode (LD) at a preset reference value corresponding to a target output, detecting an actual output power by monitoring light output by the LD, and comparing the actual output power to the target output power. The method further includes compensating the reference value and writing data to the optical disc using the compensated reference value. | 06-27-2013 |
20130235711 | WRITE POWER ADJUSTMENT METHOD AND INFORMATION RECORDING METHOD - In write power adjustment for an optical disc having a plurality of information storage layers, data of trial writing is varied by the influence of layers other than a target layer. It is difficult, therefore, to determine optimal write power. A modulation M[m] is obtained from a reproduction signal amplitude of a signal subjected to the trial writing performed with use of write powers Pw[m] (m being an integer) of a plurality of kinds. At least an optimum write power intercept Pint_opt is determined by fitting a relation between the Pw[m] and the M[m] by a modulation characteristic formula M=Masy×(1−(Pint−Pasy)/(Pw−Pasy)) having an asymptotic modulation Masy, a write power intercept Pint, and an asymptotic write power Pasy as parameters. Approximation accuracy by the fitting and/or quality of the trial writing signal are evaluated with use of at least the M[m], the modulation characteristic formula, and the Pint_opt. An optimum write power Pw_opt is calculated by performing a specified operation at least with use of the Pint_opt. | 09-12-2013 |
369530270 | By detection of storage medium incident radiation | 2 |
20110235489 | INFORMATION RECORDING/REPRODUCTION DEVICE AND IMAGE FORMING METHOD - An image formation width calculation circuit and an image formation shift amount determination circuit are provided so that, before a visible image is formed, an effective image formation diameter of an image formation laser spot is measured, and based on the result, a shift amount of the laser spot is adjusted. An optical pickup which forms a plurality of laser spots on an optical disk is also provided. An image formation focus control laser power control circuit and an image formation laser power control circuit are also provided. A focus control laser spot is located ahead of the image formation laser spot. | 09-29-2011 |
20120236698 | OPTICAL DISK DRIVE - An optical disk drive controls recording power with high accuracy in accordance with a measured β value and a target β value. A system controller of the optical disk drive determines a β value at which jitter or an error rate becomes minimum, in both an inner radius and an outer radius of an optical disk, and determines a difference between the determined β value and the target β value for each of the inner and outer radii. A corrected value for an arbitrary position, arbitrary speed, and an arbitrary temperature is calculated from a difference achieved at the inner radius and a difference achieved at the outer radius, by means of linear interpolation. The measured β value for the arbitrary position, the arbitrary speed, and the arbitrary temperature is compared with the target β value after having been corrected, thereby controlling recording power. | 09-20-2012 |
369530280 | Focusing or tracking servo | 30 |
20080298193 | OPTICAL DISC, OPTICAL DISC UNIT AND METHOD OF CONTROLLING THE OPTICAL DISC UNIT - When a laser light focal point, driven by an objective lens, passes through each of a plurality of recording layers of an optical disc, data recorded on the recording layers through which the focal point passes may be deteriorated due to a difference in optical sensitivity for each recording layer or the like. In a focal point position movement in which switching of recording layers is made by a focus error signal, when the focal point position moves from a recording layer on which a laser light is focused to another recording layer which is not adjacent, light intensity or light density at the focal point is reduced in accordance with the recording layer to be passed through, thus deterioration of the data on the optical disc being prevented. | 12-04-2008 |
20080304387 | METHOD FOR PREVENTING OPTICAL DISK FROM BEING SCRAPED - The method prevents an optical disk from being scraped by an optical apparatus of a pickup head of an optical disc drive is disclosed, it mainly includes: moving the optical apparatus of the pickup head to a detection position in which the laser-light emitted from the pickup head focuses on the optical disk; detecting the first-detection position and setting a movement boundary according to the first-detection position, wherein the movement boundary has a upper boundary and a bottom boundary; preventing the optical apparatus from moving out of the movement boundary. The present method can be implemented without installing any additional apparatus in the original video disc player, and can prevent the optical disk and the inner apparatus of the optical disc drive from being scraped or damaged by the pickup head during a read/write process to increase the service life of the optical disk and the optical disc drive. | 12-11-2008 |
20090040895 | SYSTEM FOR SCRIBING A VISIBLE LABEL - A device is for scribing a visible label on the medium. The medium ( | 02-12-2009 |
20090040896 | Optical disk apparatus and method of controlling optical disk apparatus - An optical disk apparatus includes a rotary driving unit rotating an optical disk which is flexible, an optical pickup irradiating light upon a recording surface of the optical disk on which writing/reading of information is performed, a stabilizing unit stabilizing vibration of the optical disk in a rotary axial direction by using pressure difference of air flow at least on a portion where writing/reading is performed, and being disposed on a side of the optical disk opposite to a side on which the recording surface is provided, and a control-adjustment unit analyzing a value of a tracking error signal of the optical disk obtained by scanning along a groove of the optical disk with use of the optical pickup, comparing the analyzed value of the tracking error signal of the optical disk and a value priorly obtained by scanning along a groove of a standard disk prepared beforehand, and adjusting a positional relation between the optical disk and the stabilizing member in a three dimensional space according to the result of the comparison. | 02-12-2009 |
20090046554 | OPTICAL HEAD DEVICE AND OPTICAL INFORMATION RECORDING OR REPRODUCING APPARATUS EQUIPPED WITH SAME - [Problems] To provide an optical head device capable of obtaining a desirable track error signal and a lens position signal for both two types of optical media having different groove pitches. | 02-19-2009 |
20090052292 | Method and system for signal gain control in optical disc drives - A signal gain control method and system for use in optical disc drives to prevent undesirable saturation occurrences in circuit operations. The method includes fetching a preset reading front monitor diode signal and a preset gain controlling signal for reading; generating a front monitor diode signal by a front monitor diode signal conversion circuit; calculating a gain controlling signal based on the preset gain controlling signal for reading, the preset reading front monitor diode signal, and the front monitor diode signal by a signal processor; adjusting a gain for detection signals according to the gain controlling signal by a gain adjustment unit; and generating control signals according to the adjusted detection signals by a pre-amp module. | 02-26-2009 |
20090207709 | FOCUS CONTROL DEVICE, AND OPTICAL DISC DEVICE - In a device for controlling a focus to an optical disc having a land section and a groove section, the control is performed so as to avoid a focus step difference at a land-area/groove-area switching point. | 08-20-2009 |
20090303852 | Optical Scanning Device and Method for Determining Focus Position - The optical scanning device [ | 12-10-2009 |
20090316550 | Recording/Reproducing Apparatus and Tracking Control Method - A recording/reproducing apparatus and a tracking control method which can perform data processing for reliably recording or reproducing data on or from a recording medium are disclosed. Tracking error signal (TE) is generated using difference signal (A−B) produced from reflected light from a recording medium and an offset included in the difference signal is compensated for using another reflected light received separately from the reflected light. Offset-compensated tracking error signal ((A−B)−k(C−D)) is obtained by subtracting another difference signal (C−D) produced from the separately received reflected light according to gain (k) from difference signal (A−B). Different gains may be used for areas on the recording medium having different reflectances. Thus, the tracking error signal can be compensated for an optical offset caused by lens movement and an offset caused by different reflectances and light radiated to the recording medium can accurately follow its track to perform reliable data processing. | 12-24-2009 |
20100054099 | Optical Disc Apparatus and Focus Offset Setting Method Thereof - An optical disc apparatus in which, regarding mutually adjacent recording layers, a focus offset of an optical system to a guide groove formed in a recording surface of the recording layer is learned based on a signal based on reflected light from the guide groove, and a focus offset for recording or reproduction is calculated and set based on the learned focus offsets for the respective recording layers. As the focus offset of the optical system for recording or reproduction, a mean value of the learned focus offsets for the respective recording layers is set as a focus offset common to the both recording layers. Otherwise, a focus offset when a difference between the focus offset and the learned focus offsets for the respective recording layers is a value corresponding to a characteristic of the optical system is set. This structure reduces processing time and ensures processing precision upon focus offset processing for plural recording layers. | 03-04-2010 |
20100118677 | Optical Disc Apparatus, Method of Adjusting Focus Offset for Optical Disc Apparatus, and Program for Executing Focus Offset Adjustment - In an optical disc apparatus, whether an unrecorded recording layer without information recorded thereon is included in the multiple recording layers of the optical disc mounted inside the apparatus is judged. then when the unrecorded recording layer is judged to be present, a signal for focus offset adjustment is recorded in a non-user data recording area of the unrecorded recording layer, and reproduction of the recorded focus offset adjusting signal is followed by its quality evaluation, which is further followed by calculation and setup of an appropriate focus offset value based on evaluation results. | 05-13-2010 |
20100157764 | FOCUS OPTIMIZATION ROUTINE WITH SUB-OPTIMAL JUMP SETTINGS IN OPTICAL DISC SYSTEMS - A method and system for obtaining focus optimization in an optical disc system is disclosed. The focus offset of a recording unit is set to a first of a plurality of predetermined values. A HF quality value is measured and stored for the selected focus offset value of the recording unit. The focus offset is then set to a best-known focus offset value. Tracks on the optical media being read are then jumped. The above steps are then repeated for each of the plurality of predetermined focus offset values. The optimal focus setting is then determined from the stored HF quality measurements. | 06-24-2010 |
20100238777 | OPTICAL DISK DEVICE, METHOD OF CONTROLLING OPTICAL HEAD, AND CONTROL DEVICE FOR OPTICAL HEAD - An optical disk device includes a DPDTE signal generating section that detects misalignment between a light spot and a mark or a pit, an FE signal generating section, an optical crosstalk correcting section which corrects a signal output by the FE signal generating section using the DPDTE signal generating section, and a focus control section which controls an actuator so that a light beam converges on an information layer. The DPDTE signal generating section detects the misalignment on the basis of phase information obtained from signals received from predetermined light receiving areas. The optical crosstalk correcting section performs a correcting operation of removing a signal component from predetermined receiving areas of a detector which component is used for a DPDTE signal, the signal component being contained in the signals from the predetermined light receiving areas of the detector which signals are used by the FE signal generating section. | 09-23-2010 |
20100254239 | METHOD FOR ADJUSTING TILT OF OPTICAL PICK-UP HEAD - The present invention relates to a method for calibrating a focus position of an optical pick-up. The optical pick-up is located on a focus position at a preset distance from a recordable optical medium to emit a recording beam of a preset power to the recordable optical medium so that corresponding optical data are recorded in the recordable optical medium. The method includes: altering a focus position of the optical pick-up during a recording process to generate a corresponding write radio frequency (RF) signal; detecting a minimum value of the write RF signal and a corresponding object focus position; and moving the optical pick-up to the object focus position so that the optical pick-up performs recording at the object focus position in the recordable optical medium. | 10-07-2010 |
20100284258 | INTERLAYER MOVEMENT APPARATUS, AND INTEGRATED CIRCUIT FOR INTERLAYER MOVEMENT APPARATUS - To provide an interlayer movement apparatus of an optical disc apparatus which can perform the interlayer movement stably even when the interlayer distances of the multi-layer optical disc which are specified by the disc specification are different between the respective layers. | 11-11-2010 |
20110019518 | Device and method for detecting defect signals on an optical disc - A device for detecting defect signals on an optical disc includes a finite state machine (FSM) to control a servo system of an optical disk drive. When the FSM is in a DETECT state and defect signals are greater than thresholds, a detection counter is set to a first predetermined value and the FSM enters an ARM state. In the ARM state, when the detection counter counts zero, the FSM enters a KICK state and the detection counter is set to a second predetermined value. In the KICK state, a flag signal XDFCT is asserted. When the detection counter in the KICK state counts to zero, the FSM enters a WAIT state and the detection counter is set to a third predetermined value. When the flag signal XDFCT is asserted, corresponding servo control signals for the servo system are clamped to a programmable constant voltage. | 01-27-2011 |
20110019519 | OPTICAL DISC RECORDING METHOD AND OPTICAL DISC APPARATUS - This document relates to a method of compensating for a sensitivity variation of a tracking actuator with focusing offset when recording labels on a disc for label recording. A focusing point suitable for the position of an object lens in the circumference direction and/or the radius direction is detected, a tracking sensitivity corresponding to the detected focusing point is obtained based on information about a tracking sensitivity variation according to a focusing point variation, and labels are recorded on a label plane using the detected focusing point and tracking sensitivity. The information may be measured using at least two different types of discs one of which has a distance, between the surface of the disc and a pattern area required for a feed forward servo operation, different from the distance of the other. | 01-27-2011 |
20110122753 | METHOD FOR DETERMINING FOCUS HEIGHT - A method for determining a focus height of an optical disc drive is provided. A disc is placed into the optical disc drive. An objective lens is moved to lock a focus on a data layer of the disc. The objective lens is radially moved from inner tracks to outer tracks, and at the same time the focus voltages at the radial position are recorded. A focus voltage curve is curve-fitted based on the recorded focus voltages. A corresponding refocus voltage is obtained from the focus voltage curve according to the radial position where a focus drop occurs. The objective lens is moved to the focus height by the refocus voltage for refocusing. | 05-26-2011 |
20110176403 | OPTICAL HEAD DEVICE, OPTICAL INFORMATION PROCESSING DEVICE, AND SIGNAL DETECTION METHOD - An optical head device includes a light source ( | 07-21-2011 |
20110299375 | OPTICAL PICKUP DEVICE AND OPTICAL DISC APPARATUS - In a small-sized optical pickup device for enabling to obtain a stable servo-signal, as well as, a focus error signal and a tracking error signal, without receiving ill influences of stray lights from other layers, when recording/reproducing a multi-layer optical disc, a reflection light from the multi-layer optical disc is divided into plural numbers of regions by a diffraction grating. And, it is divided into at least four (4) regions, by a division line in the tangential direction of the optical disc and a division line in the radial direction thereof. Light receiving parts, for detecting either one of grating diffraction lights, i.e., a +1 | 12-08-2011 |
20120057445 | OPTICAL PICKUP DEVICE AND OPTICAL DISC APPARATUS - For obtaining stable servo-signals without receiving ill influences of stray lights from other layers, on both a focus error signal and a tracking error signal, when recording/reproducing a multi-layer optical disc having small gap between layers thereof, a light beam is divided with using a first and a second diffraction gratings. The first diffraction grating is a polarization diffraction grating, and is mounted on an actuator. The second diffraction grating is disposed on a fixed portion. The first diffraction grating has a first region having a center of a light beam and other(s), and among signal lights reflecting from the disc, the light beam entering into the first region is diffracted, and the light beam entering into the second region transmits therethrough. The second diffraction grating transmits the light beam diffracting on the first region of the polarization diffraction grating therethrough, while diffracting the light beam diffracting on the second region. | 03-08-2012 |
20120113784 | OPTICAL PICKUP - An optical pickup having a first diffractive optical element that acts on light of a specific wavelength, the first diffractive optical element being arranged in an optical path for guiding reflected light from an optical disk to a photodetector. The photodetector comprises a first detector including a first main light receiver divided into a two-by-two square matrix, and a second detector including a second main light receiver divided into a two-by-two square matrix, the second detector being arranged in a row with the first detector. When the light of a specific wavelength is used, zero-order light of the first diffractive optical element is received by the first main light receiver, +first-order light (or −first-order light) diffracted by the first diffractive optical element is received by the second main light receiver, and a tracking error signal is generated using an output signal from the second main light receiver. | 05-10-2012 |
20120134253 | OPTICAL DISK DEVICE AND OPTICAL DISK RECORDING METHOD - An optical disk device and recording method of recording data on an optical disk by driving a laser light source with a driving current superimposed with a high-frequency current. The device and method includes a controller for disabling tracking servo and establishing conditions for reproducing a signal from a predetermined region of the optical disk, for generating a tracking error signal by superimposing the high-frequency current varied in amplitude on the driving current for the laser light source, for determining an amplitude of the high-frequency current that provides an optimum quality of the generated tracking error signal, and for recording data on the optical disk by applying the driving current for the laser light source superimposed with the high-frequency current of the determined amplitude. | 05-31-2012 |
20120250482 | OPTICAL DISC DEVICE AND RECORDING METHOD - An optical disc device and a recording method is provided in which information can be additionally recorded on an optical disc, which has a servo layer and recording layers separately formed, by accurately correcting a relative angle between a light beam and the optical disc used in the previous recording without providing an area where recording is not performed while maintaining the stability of tracking servo. The above subject can be solved by studying with high accuracy the relative angle between the optical disc and the optical axis used in the previous recording by applying a radial tilt servo according to a signal from the recording layers with the tracking servo applied by the servo layer. Further, the additional recording can be performed stably by fixing the radial tilt at the previously studied angle when the recording is performed. | 10-04-2012 |
20130083641 | OPTICAL PICKUP DEVICE AND OPTICAL READ/WRITE APPARATUS - In one embodiment, the optical pickup device includes: a light source that emits a light beam; a diffractive element that diffracts the light beam and generates a zero-order and ±first-order diffracted light beams; an objective lens that converges the diffracted light beams onto the same track on the storage medium; and a photodetector that receives the diffracted light beams reflected from the storage medium. If a distance from a light beam spot left by the zero-order diffracted light beam on the track to light beam spots left by the ±first-order diffracted light beams on that track is d [μm], the scanning linear velocity of the storage medium is v [m/s], and a time it takes for a phase-change material of the storage medium that has once been melted by the zero-order diffracted light beam to solidify is T [μs], vT≦d is satisfied. | 04-04-2013 |
20130135978 | OPTICAL INFORMATION REPRODUCING APPARATUS - Disclosed is an optical information reproducing apparatus that has a light path difference between two lights easily adjusted, has a high effect on the amplification of a signal, and detects an optical information signal of an interfering type. The optical information reproducing apparatus splits a luminous flux emitted from a laser source into a first luminous flux as a signal light and a second luminous flux as a reference light not collected on an optical information recoding medium, makes the signal light optically interfere with the reference light in a state in which the signal light and the reference light are different from each other in a phase relationship to thereby produce interfering lights, and detects the interfering lights. | 05-30-2013 |
20140321253 | TEST DEVICE AND TESTING METHOD FOR TESTING FOCUS FUNCTION OF EXTERNAL DEVICE - A test device communicates with an external device with a plurality of parameters. The test device includes a setting module, a first determining module, a focus module, and a prompting module. The setting module generates a setting signal for controlling the external device to set values of the parameters. The first determining module controls the focus module to generate a focus instruction to control the external device to execute a focus function, when the test device receives feedback information from the external device, which are generated by the external device after the values of the parameters are completely set. In addition, the focus module receives reflecting information which is generated by the external device after the external device executes the focus function. The prompting module outputs different prompting information based on the received reflecting information. | 10-30-2014 |
20140369175 | OPTICAL PICKUP DEVICE - An optical pickup device includes a light source configured to output laser light, an objective lens configured to converge the laser light emitted from the light source onto an optical disc, a sensor lens including a lens surface on which return light reflected by the optical disc is incident and that is also configured to generate an astigmatism in the return light, and a light-receiving element configured to receive the return light which has passed through the sensor lens | 12-18-2014 |
20150023143 | Optical Disc Device and Focus Jump Method - The optical disc device includes an optical pickup, a focus-error-signal generation section for generating a focus error signal of the differential astigmatic method by using a parameter and an electric signal outputted from a photodetector in the optical pickup, a control section for controlling the optical pickup to make a focus jump operation, and a parameter value changing section for temporarily changing a value of the parameter to be used to generate a focus error signal of the differential astigmatic method by the focus-error-signal generation section when the focus jump operation is performed by using the focus error signal of the differential astigmatic method. | 01-22-2015 |
20150138941 | OPTICAL RECORDING MEDIUM DRIVE DEVICE, TRACKING ERROR DETECTION METHOD - As for a quadruple light receiving unit, in a case where divided regions of A to D as in a DPD scheme is defined, when binarization signals of light reception signals in regions A to D are set as signals A to D, <1> exclusive OR between the signal A without delay and the signal B with delay, <2> exclusive OR between the signal A with delay and the signal C without delay, <3> exclusive OR between the signal B without delay and the signal D with delay, and exclusive OR between the signal B with delay and the signal D without delay are calculated, and a tracking error signal is obtained on the basis of the calculation of (<1>+<3>)−(<2>+<4>). Thus, the above problem can be solved. | 05-21-2015 |
369530290 | Transduced location indicating | 4 |
20090279404 | Apparatus and Method for Writing Optical Information - An optical disk writing apparatus enhances writing accuracy by writing first data (e.g., test data) that encodes a first writing strategy within first patterns on an optical disk, in response to a first writing signal. A reproducing signal is generated in response to reading the first data from the optical disk. Variations between leading and trailing edges of the first writing signal and leading and trailing edges of the reproducing signal are detected. A correction value is determined using a jitter evaluation function to evaluate the detected variations. From these operations, a second writing strategy is determined using the correction value to modify the first writing strategy. Thereafter, second data (e.g., actual data) is written, which encodes the second writing strategy within second patterns on the optical disk. | 11-12-2009 |
20100202267 | TRACK DETERMINATION - A light beam is scanned on a track of a recording medium, the track having a first track region and a second track region, each track region having a physical property that has recurring deviations. A wobble signal is derived from the light beam, the wobble signal having information associated with the recurring deviations. Whether the light beam is at the first track region or the second track region is determined based on a frequency, a period, or a pulse width of the wobble signal. | 08-12-2010 |
20110222386 | OPTICAL DISK DRIVE - There is provided an optical disk drive that pursues power saving and simultaneously assures data recording quality. A servo processor of the optical disk drive has a low frequency equalizer, a high frequency equalizer, a limiter, and an adder. A limit voltage value of the limiter is set by means of a control command from a system controller. The limit voltage value is set so as to become greater during a data recording period than in a data regeneration period. An output from the adder is supplied as a tracking drive signal to a tracking actuator or as a focus drive signal to a focus actuator. | 09-15-2011 |
20140286151 | OPTICAL PICKUP AND DISC DEVICE - An optical pickup includes a plurality of light sources, an objective lens, a diffractive optical element, and a light-detecting unit. The various light sources emit light of wavelengths that are different from each other. The objective lens focuses light on an optical disc. The diffractive optical element includes a diffracting portion and a light-blocking portion. The diffracting portion diffracts return light reflected from a first recording layer of the optical disc where information is being read or written. The light-blocking portion blocks stray light reflected from a second recording layer of the optical disc that is different from the first recording layer. The light-detecting unit receives the diffracted light of the diffractive optical element and generates an output signal to generate a tracking error signal based on this diffracted light. Furthermore, the light-blocking portion includes a plurality of light-blocking patterns which block light of wavelengths that are different from each other. | 09-25-2014 |