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| Number | Title | Issue Date |
| 8184510 | Method of recording and reproducing an optical recording medium There is provided a method of recording and reproducing an optical recording medium which performs a tracking servo and a focusing servo by irradiating a laser beam onto determined positions including lands and grooves of a track of the recording medium and detectin... | 05/22/2012 |
| 8180196 | Optical recording/reproducing apparatus and data recording method thereof An optical recording/reproducing apparatus and a data recording method thereof. The optical recording and/or reproducing apparatus includes: an encoder which encodes a data for recording in a specified format; an optical pickup which records the encoded data onto a ... | 05/15/2012 |
| 8179753 | Positioning control unit and optical disk drive A position-error-signal calculation circuit (105) calculates a relative position error between a laser-focused-beam spot (103) and an information recording layer (102), and generates a focus error signal (106). A filter (108) ampli... | 05/15/2012 |
| 8174941 | Optical disc apparatus, crosstalk correction method and integrated circuit When a focus error signal (FE signal) is detected with an astigmatic method, a track crossing component leaks into the FE signal. Another detection method for the FE signal would reduce the leaking signal, but is not applicable when the light use efficiency decrease... | 05/08/2012 |
| 8164991 | Optical disk apparatus and optical pickup device A temperature sensor is disposed in an optical pickup to detect a temperature of an objective lens. An optical element (for example, a collimator lens) is driven according to a temperature change of the objective lens, which corrects deterioration of an optical char... | 04/24/2012 |
| 8144553 | Disk drive A disk drive for driving a disk is disclosed, which includes: a driving unit configured to provide a driving force onto the disk, a main circuit pattern electrically connected with the driving unit, a sensor unit configured to sense a rotation speed of the disk, a f... | 03/27/2012 |
| 8130604 | Spherical aberration compensation method and device of optical disc drive A spherical aberration compensation method is provided. A first thickness of a cover layer at a first radius position of an optical disc is measured. A second thickness of the cover layer at a second radius position of the optical disc is measured. A spherical aberr... | 03/06/2012 |
| 8130603 | Optical disk driving apparatus, optical disk driving system, vehicle equipped with optical disk driving system, method of correcting spherical aberration in optical disk driving apparatus, program and recording medium An optical disk driving apparatus includes an optical head device having a laser light source, a converging optical system converging a light beam emitted by the laser light source onto an optical disk, a photo detector receiving reflected light reflected by the opt... | 03/06/2012 |
| 8121001 | Method and device for protecting a servo in reading signals on a defect disc A device for protecting a servo in reading signals on a defect disc from disturbance and instability is provided. The device includes a defect detection unit and a logic combination unit. The defect detection unit receives a plurality of defect detection signals to ... | 02/21/2012 |
| 8107330 | Information recording and reproducing apparatus An information recording and reproducing apparatus for increasing a speed of tilt control, including a portion for storing reference data, a portion for storing sample values data, a portion for obtaining positional information, a stilt servo generator, a tilt adjus... | 01/31/2012 |
| 8089835 | Optical disc apparatus and tracking control method An optical disc apparatus of the present application has a lens position signal generator for generating a lens position signal representative of a position of an objective lens in a disc radial direction, an amplitude corrector for correcting an amplitude of a trac... | 01/03/2012 |
| 8081544 | Method and apparatus for deciding spherical aberration compensation value A method and an apparatus for deciding a spherical aberration compensation (SAC) value for an optical storage medium are provided. The optical storage medium comprises at least one recording layer and a cover layer. The SAC value is suitable for a selected one of th... | 12/20/2011 |
| 8077565 | Optical disc device and lens tilt control method With an optical disc apparatus of the present invention, the number of tracks of an optical disc crossed by a light spot when the tracking control is inactive is measured and stored in a memory for each passage of a predetermined rotation angle. When the tracking co... | 12/13/2011 |
| 8054716 | Optical disc apparatus and defocus control method A defocus adjustment method includes a step of storing in a memory a range of defocus values for smooth operation of an optical disc apparatus, a step of measuring the defocus value of the optical disc loaded in the optical disc apparatus, a step of comparing the de... | 11/08/2011 |
| 8050154 | Drive control apparatus, drive control method and optical pickup apparatus A control unit is caused to drive a collimator lens from a position of an origin, by a clock number A of drive pulses of a pulse rate T1, thereby to move the collimator lens, and is caused to return the lens to the position of the origin at a pulse rate T2... | 11/01/2011 |
| 8040766 | Method and apparatus for compensating for defect of storage medium An apparatus for compensating for a defect of a storage medium of an optical driving includes a memory to store sample values of a servo driving signal during at least one track sampled by a first signal and cycle information about the first signal; a servo driving ... | 10/18/2011 |
| 8031566 | Gap servo control method and apparatus in near-field optical disc drive A gap servo control method and apparatus for increasing a disturbance cancellation capability and decreasing the occurrence of an overshoot in a near-field optical disc drive include: generating an actuator driving signal of a transient response process by using a s... | 10/04/2011 |
| 8031565 | Optical pickup and optical information reproduction system In an optical disk apparatus having an exclusive RF detector plane mounted therefore, as a method of obtaining a synthesized readout signal based on band-synthesis is used in order to obtain a readout signal having a good S/N ratio, a waveform distortion easily caus... | 10/04/2011 |
| 8027231 | Information recording apparatus and method, information reproducing apparatus and method, and computer program An information recording apparatus (1) is provided with: a first judging device (191) for judging whether or not a tracking error signal is greater than or equal to a first threshold value; a detecting device (192) for detecting, as a detection ... | 09/27/2011 |
| 8027232 | Devices and methods for determining a critical rotation speed of an optical data carrier, monitoring a condition of an optical data carrier, and generating a reference signal A device determines a critical rotation speed of an optical data carrier at which a critical deflection of said optical data carrier may occur. The device includes a drive unit, a measurement unit and a determination unit. The drive unit rotates the optical data car... | 09/27/2011 |
| 8009526 | Optical pickup device and collimate lens It is an object of the present invention to provide an optical pickup device being capable of correcting coma aberration induced in a light-condensing optical system including an objective lens for an optical disc and having a reduced size and a reduced thickness in... | 08/30/2011 |
| 8009525 | Optical disc signal processing device, optical disc signal processing method, optical disc reproduction and recording device, and optical disc reproduction and recording method An optimum method for adjusting the physical position or angle of an optical pickup (a1) is automatically selected for each optical disc signal processing device so that a control target value after adjusted is included in a previous margin measurement result... | 08/30/2011 |
| 8000186 | Acting track-crossing during tracking error adjust A method for enhancing the optical initializing operation comprises: sending a radial error signal from an optical pick-up unit to a radial error signal calibration unit; sending the radial error signal from the optical pick-up unit to an offset adjuster; sending a ... | 08/16/2011 |
| 8000187 | Optical disc device An optical disc device includes: a first searching part which searches a condition where amplitude level of a TE signal is made maximum by changing either one of position of a movable lens and a focus balance value in a state where a focus servo control is performed... | 08/16/2011 |
| 7995429 | Optical disk device and tilt correction method thereof There are provided an optical disk device and tilt correction processing method for performing recording/reproduction by rapidly acquiring an optimal tilt correction value for an optical disk having a plurality of recording/reproducing layers. In an optical disk dev... | 08/09/2011 |
| 7983121 | Optical axis shift correcting device and method, and computer program An optical axis shift correcting device is provided in an optical information device including an irradiation element for applying a laser, an optical system for guiding a laser applied to an optical disc having a recording track, and a light reception element for r... | 07/19/2011 |
| 7983122 | Defocus detection device, defocus detection method and optical disk unit using the same Defocus detection device and method capable of detecting a defocus accurately during recording of information to an optical disk having a plurality of recording layers and an optical disk unit using the device and method are provided. A temporal restriction is impos... | 07/19/2011 |
| 7961567 | Optical disk apparatus In an optical disk apparatus according to an exemplary embodiment of the invention, a management information retaining unit retains an information group which should regularly be recorded as disk management information. The disk management information is obtained fr... | 06/14/2011 |
| 7957233 | Near-field gap pull-in method and optical disc apparatus therefor A gap pull-in method and an optical disc apparatus. Whether light condensed on a disc as an actuator ascends is near-field light is determined using a gap error signal. The range of an actuator driving voltage value during a section where the decrease rate of the ga... | 06/07/2011 |
| 7957234 | Optical pickup apparatus An optical pickup apparatus comprising: a laser diode; an objective lens configured to focus laser light emitted from the laser diode on a signal recording layer of an optical disc; a first aberration correction element arranged in an optical path between the laser ... | 06/07/2011 |
| 7952965 | Optical pickup device, optical pickup controller and optical pickup control method An optical pickup device such that the driving force of the drive unit provided on the same optical base as that of the objective lens exerts no adverse influence on controlling of the objective lens is provided. The optical pickup device 1 has an objective l... | 05/31/2011 |
| 7948841 | Diffraction grating, optical pickup device and optical disc apparatus A pickup device splits and detects a light beam reflected from a disc with the use of a grating. The grating has first to six areas, wherein the first area and the second area, the third area and the fifth area, and the fourth area and the sixth area are arranged in... | 05/24/2011 |
| 7940612 | Optical disc apparatus and control method thereof The present invention provides an optical disc apparatus that reduces access time while suppressing the emanation of heat from a beam expander. A microcomputer manages the operation time and pause time of a stepping motor constructed to move the movable lens of the ... | 05/10/2011 |
| 7940611 | Optical disc apparatus An optical disc apparatus comprises an overcurrent detector and when the overcurrent detector detects an overcurrent during a recording operation or a reproduction operation and during an operation for controlling a focus of an objective lens, a rotation speed of an... | 05/10/2011 |
| 7929387 | Adjusting system for adjusting tilt of an optical pickup head An adjusting system for adjusting a tilt of an optical pickup head includes a collimator, a processing device, and a controller. The collimator receives reflected light beams from the optical pickup head and generating images from the reflected light beams. The proc... | 04/19/2011 |
| 7929386 | Optical disc device A focus error signal is generated by a first-order diffracted light diffracted by regions 23b, 24b on a hologram plane 2a, and an offset of a tracking error signal is canceled by first-order diffracted light diffracted by re... | 04/19/2011 |
| RE42235 | Compensation method and device for tracking operation of optical storage system An optical storage system includes a pickup head for picking up data from a storage medium. Firstly, the maxima of a tracking error signal and runout are obtained in a calibration procedure in a close loop formed by an optical pickup head, a pre-amplifier, a compens... | 03/22/2011 |
| 7911893 | Disc device A disc device capable of achieving a slimming down of a tilt adjusting portion is provided. A tilt adjusting member 404 of a tilt adjusting portion 400 moves an optical pickup driving portion 307 along a guide face 401a to adjust a... | 03/22/2011 |
| 7907482 | Method and system for correction of errors A method and system for removing periodic disturbances pertaining to turntable and spindle motor errors during recording of a blank optical information carrier. The periodic disturbances are determined in advance and removed only during recording by a repetitive con... | 03/15/2011 |
| 7898911 | Optical pickup apparatus equipped with a lens angle adjusting member and a semiconductor laser element In an optical pickup apparatus, a collimator lens is rockably supported by edges of two protruding portions formed on opposing sides of a groove of an optical base. The collimator lens is urged against the edges of the two protruding portions by a leaf spring. The p... | 03/01/2011 |
