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| Number | Title | Issue Date |
| 8189433 | Optical disk drive device and additional recording method Disclosed herein are an optical recording medium driving device and an additional recording method, which performs tracking servo control for moving an objective lens in a direction orthogonal to a tangential direction of a guide track so that a guide tracking error... | 05/29/2012 |
| 8154960 | Power saving method and system applied in optical disk drive The present invention sets forth a power saving method and a power saving system applied in an optical disk drive. The power saving system comprises a central processing unit, a spindle motor, an optical pick-up unit, an analog portion of control circuits and a digi... | 04/10/2012 |
| 8154961 | 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... | 04/10/2012 |
| 8125861 | Optical disk device This optical disk device includes a pickup, an offset means, a focus servo means, and a layer jump means. The offset means generates a focus error signal on the basis of the output of the pickup, and applies an offset voltage to that focus error signal. And the laye... | 02/28/2012 |
| 8120999 | Optical disc apparatus and defocus correcting method An optical disc apparatus in which a bias of a focusing error signal is changed to a value according to a recording power at timing corresponding to a predetermined address position before starting the recording and a defocus of an opposite polarity is preliminarily... | 02/21/2012 |
| 8121000 | Optical disk apparatus In an optical disk apparatus, an optical pickup includes an actuator for driving an object lens, and a sensed signal output part for making it possible to generate a tracking error signal and a lens error signal by addition/subtraction, and a signal processor includ... | 02/21/2012 |
| 8120998 | Optical disk drive and method for driving the optical disk drive in relation to a velocity switching point An optical disk drive includes: an objective lens for converging a light beam onto an optical disk with an information storage layer; an actuator for moving the lens perpendicularly to the storage layer; an actuator driver for moving the lens at a predetermined velo... | 02/21/2012 |
| 8102738 | Optical pickup and optical disk apparatus A microprocessor performs preliminary tracking servo control of an objecting lens by moving the objective lens in a radial direction of an optical disc so as to allow a laser beam reflected by the optical disc to be equally divided and received by first and second l... | 01/24/2012 |
| 8085628 | 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 thres... | 12/27/2011 |
| 8081543 | Optical disc apparatus and focus control method An optical disc apparatus according to the present invention steadily performs a focus jump operation and a track-crossing seek operation relative to an optical disc having a plurality of recording layers. A signal processing section generates a focus error signal b... | 12/20/2011 |
| 8077564 | Method for improving readability of an optical disc, and associated optical storage apparatus A method for improving readability of an optical disc includes: changing a first control parameter of an optical storage apparatus that accesses the optical disc and obtaining a plurality of associated values of an index corresponding to the readability of the optic... | 12/13/2011 |
| 8059501 | Optical disk drive for scanning an optical disk with a scanning velocity and method for scanning an optical disk with a scanning velocity An optical disk drive and a method for scanning an optical disk that includes a substantially circular track with a scanning velocity is provided. A servo control signal (SCS) is determined based on a servo error signal (SES). A first performance indicator (IND1 | 11/15/2011 |
| 8040765 | 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 recor... | 10/18/2011 |
| 7978569 | Optical disc device and focus control method A focus control section first performs a reference focus control process in which a reference optical beam is focused on a reference layer of an optical disc according to the result of receiving a reference reflection optical beam, and then switches from the referen... | 07/12/2011 |
| 7969831 | 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 generati... | 06/28/2011 |
| 7961566 | Optical disc playback device An optical disc playback device has a signal generating section, a shift set section, a shift drive section, a position storage section, an ascent/descent set section and an ascent/descent drive section. The signal generating section generates a focusing error signa... | 06/14/2011 |
| 7948836 | Optical disk drive and optical disk drive control method The present invention is directed to an optical disk drive in which laser beams are emitted to an optical disk in a state of not rotated, and simultaneously an objective lens which collects the laser beams is moved to a direction approaching the optical disk at a co... | 05/24/2011 |
| 7948837 | TE signal polarity determining system and related method thereof A TE signal polarity determining method, includes: (a) obtaining a wobble related signal, an RF related signal, a TE signal and an accessing direction; and (b) determining if an original polarity of a TE signal should be changed or not according to phases of the RF ... | 05/24/2011 |
| 7948838 | 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 dete... | 05/24/2011 |
| 7933176 | 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 (100) and to an apparatus and a corresponding method for determining read parameters for reading... | 04/26/2011 |
| 7916585 | Optical disc drive and method of controlling focal position An optical disc drive for recording and/or reading information on or from an optical disc is disclosed. The optical disc drive includes: a position controller which controls the position of the objective lens based on the position-controlling light beam reflected by... | 03/29/2011 |
| 7852715 | Optical disc apparatus and optical disc determining method An objective lens is moved with a disc irradiated with laser light. A maximum value FEmax and a minimum value FEmin of the focus error signal, and a maximum value FSmax of the amplitude of a focus sum signal are measured. “(FEmax−FEmin)/FSmax” is compared with... | 12/14/2010 |
| 7848187 | Information reproducing/recording apparatus The present invention provides an information reproducing/recording apparatus capable of executing tracking servo normally in short time at the time of loading an information recording medium. At the time of executing a tracking servo process on a BD (Blu-ray Disc)-... | 12/07/2010 |
| 7839731 | Optical system for optical disc There is provided an optical system for an optical disc which requires a numerical aperture larger than or equal to 0.60. The optical system is provided with a light source, an objective lens, and a driving system that controls a position and an attitude of the obje... | 11/23/2010 |
| 7800988 | Optical recording using secondary tracking method The present invention is embodied in a method for storing computer readable data on a removable storage medium, including using a first wavelength to write data to the removable storage medium, using a second wavelength to maintain radial tracking on the removable s... | 09/21/2010 |
| 7760591 | Optical disc reproducing apparatus An objective lens is raised from below upwards with a DVD laser diode turned on and levels of detection signals A, B, C, and D from a four segment photodetector are acquired and stored in a RAM. A ratio (A+D)/(B+C) in a direction of the X-axis is then calculated. Wh... | 07/20/2010 |
| 7733747 | Information recording or reproducing device and recording or reproducing method An information recording and/or reproducing apparatus using a removable disk-shaped optical recording medium (51) is provided which includes a storage unit (31) to store an axial-runout amount in a predetermined radial position on the disk-shaped optic... | 06/08/2010 |
| 7675824 | Optical disc apparatus One of the objects of the invention is to provide an optical disc apparatus capable of focusing on a signal surface regardless of appearance of a fake signal. The optical disc apparatus includes: an optical pickup for outputting a signal on the basis of reflection l... | 03/09/2010 |
| 7660210 | Disk device A driver IC 1 has a bias terminal 20a via which a bias voltage fed from a microcomputer 2 to drive and control a loading motor 4 is fed in and a bias terminal 20b via which a bias voltage fed from a DSP 3 to dr... | 02/09/2010 |
| 7616533 | Optical disc apparatus and access control method of the same An optical disc apparatus, as a learning operation before a recording or reproducing operation, rotates an optical disc at a first speed to read PID information, discriminates between lands and grooves of the optical disc, detects switching positions between lands a... | 11/10/2009 |
| RE40946 | Optical disk apparatus An optical disk apparatus comprises a focusing means for focusing a light beam on a recording medium having first and second information faces; means for moving a focal point of the light beam in a direction substantially perpendicular to the information faces of th... | 10/27/2009 |
| 7586816 | Playback apparatus and layer jump method A playback apparatus that plays back a recording medium having recording layers includes an optical head irradiating the recording layers with laser light using an objective lens and reading information recorded in the recording layers; an actuator holding the objec... | 09/08/2009 |
| 7570549 | System and method for efficiently timing recalibration procedures in a disc drive apparatus A disc drive apparatus (1) is described, for writing/reading information into/from a storage medium (2), such as an optical disc. After start-up, multiple recalibration processes are executed, wherein the recalibration processes are executed more frequ... | 08/04/2009 |
| 7570550 | Focus servo recovery processing method for optical disc device and optical disc device In an optical disc device employing a CLV method, executing pickup return processing when focus drop occurs during recording poses problems of increased waiting time for rotation and increased focus servo recovery processing time. When defocusing occurs and focus pu... | 08/04/2009 |
| 7548492 | Optical disk recording/reproduction device and search method for information recording area of optical disk in the same The optical disk recording/reproduction device is provided with an information recording area search means, comprising, a moving means which detects the presence and absence of information and return moves an optical pickup from inward to outward or from outward to ... | 06/16/2009 |
| 7512042 | Method of controlling focus of optical disk recording and reproducing device In an optical disk recording and reproducing device which uses an optical disk having at least a first recording layer and a second recording layer, a thickness of a spacer section between the first recording layer and the second recording layer is measured, an amou... | 03/31/2009 |
| 7457208 | Method and apparatus for determining position of optical pick-up head The displacement of a pick-up head along the radial direction of an optical disk is detected, and the absolute position of the pick-up head is determined by the accumulation of the displacement, hence the apparatus knows which area on the optical disk the pick-up he... | 11/25/2008 |
| 7443774 | 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, by radiating light from the second layer. The processor includes: a light detector including at least one photodete... | 10/28/2008 |
| 7440362 | Optical disc drive which uses a train of pulses to shift the focus of a focusing section An optical disc drive includes: a light source; a focusing section; a focus shifting section for shifting the focal point of light by changing the position of the focusing section perpendicularly to a data storage layer of a given optical disc in accordance with a c... | 10/21/2008 |
| 7406509 | Dynamic switching of a communication port in a storage system between target and initiator modes A storage system includes a communication port, the mode of operation of which can be dynamically switched by a user between a target mode and an initiator mode. The port may be a Fibre Channel port. The storage system may be a unified storage system operable to pro... | 07/29/2008 |
