Class / Patent application number | Description | Number of patent applications / Date published |
369530190 | Relative transducer to medium misalignment (e.g., relative tilt) | 18 |
20080198717 | Aberration Correcting Apparatus, Optical Pickup, and Aberration Correcting Method - A kind of an optical disc is discriminated by a disc discriminating section, an order of aberrations to be corrected is set by an order setting section by the kind of the optical disc, drive of a liquid crystal optical element is controlled by a drive control section through a liquid crystal driver, and an aberration of an optical beam is corrected based on the order of the aberration. The level of importance of the aberration correction differs by the kind of the optical disc, and the order of the aberration is set by the level of importance of the aberration correction. | 08-21-2008 |
20080212436 | Optical Pick-Up and/or Recording Device - For optical data storage applications a near field optical system can be used. In near field optical systems an accurate control of the distance between the solid immersion lens and the disc surface is crucial. After the correction of a tilt between the lens and the disc, the laser beam may not always be parallel to the optical axis. This has a detrimental effect on the gap signal used for the distance control. The optical head of the invention comprises a gap signal correcting unit to take care of such detrimental effects. | 09-04-2008 |
20080304386 | METHOD AND SYSTEM FOR ADJUSTING TILT OF AN OPTICAL PICKUP HEAD - A method is used for adjusting a tilt of an optical pickup head. The method includes: identifying initial coordinates of the first static spot, the second static spot, and the dynamic spot in an image generated from three reflected light beams from the optical pickup head; turning one of the adjustable screws a predetermined calibrated rotation angle; recording current coordinates of the first static spot, the second static spot, and the dynamic spot in another image generated from three reflected light beams from the optical pickup head; calculating a total needed rotation angle of the one adjustable screw according to the initial coordinates, the predetermined calibrated rotation angle, and the current coordinates; and turning the one adjustable screw a remaining rotation angle computed by subtracting the predetermined calibrated rotation angle from the total needed rotation angle. An adjusting system is also disclosed. | 12-11-2008 |
20080310274 | Radial Tilt Estimation Via Diagonal Push-Pull - A device is arranged for scanning an optical record carrier ( | 12-18-2008 |
20090010126 | OPTICAL DISK APPARATUS, CONTROL METHOD OF OPTICAL DISK APPARATUS, AND INTEGRATED CIRCUIT - A disk motor which rotationally drives an optical disk; a rotational phase detector which detects a rotational phase thereof; an optical head having a collecting lens which collects an optical bean; a light detector and an LE signal generator which detect a position of the collecting lens in the optical head as a position signal; an LE signal memory recorder and an LE signal memory which store, in synchronization with a rotational phase to be detected by the rotational phase detector, the positional signal from the LE signal generator; an LE signal memory regenerator which outputs as a correction signal, in synchronization with a rotational phase to be detected, the positional signal which has already been detected; a subtractor; an LE signal filter, a drive circuit and a Tk actuator which move the collecting lens using a signal from the subtractor; and a low pass filter which reduces a high-frequency component of the correction signal are provided. | 01-08-2009 |
20090059752 | OPTICAL DISC APPARATUS AND METHOD OF DRIVING THE SAME - An optical disc apparatus, and a method of driving the same, includes a light focusing element disposed to focus light emitted from a light source onto a disc; an actuator to move the light focusing element toward or away from the disc according to a voltage applied to the actuator; a light intensity detection unit to detect the intensity of light reflected from the disc ; a servo unit to generate a gap error signal and a third voltage, the third voltage being the sum of a first voltage and a second voltage, and to apply the generated third voltage to the actuator; and a control unit to control the servo unit to perform a gap pull-in operation when the light focusing element is moved toward the disc according to the gap error signal and the third voltage. | 03-05-2009 |
20090086600 | OPTICAL DISC DRIVE APPARATUS, CAMERA APPARATUS, AND METHOD FOR CONTROLLING TILT OF LIGHT BEAM IN ACCORDANCE WITH SKEW IN OPTICAL DISC - An optical disc drive apparatus includes a rotatably supporting drive unit supporting an optical disc, an optical pickup, an angular velocity sensor detecting the magnitude and direction of an angular velocity, a skew estimating section estimating disc skew from the result of detection by the angular velocity sensor, such that one estimated skew value in a case where the angular velocity is applied in a direction in which the optical disc moves away from the optical pickup differs from another estimated skew value in a case where the angular velocity of the same magnitude but in the opposite direction, in which the optical disc approaches the optical pickup, is applied, and a tilt drive section changing the tilt of the light beam in accordance with the estimated skew value and correcting a shift, occurring because of the angular velocity, in a light beam applying position on the optical disc. | 04-02-2009 |
20090147643 | MULTI-LAYER DATA STORAGE MEDIUM AND RECORDING LAYER IDENTIFICATION METHOD THEREOF - A multi-layer data storage medium includes a plurality of recording layers in which a guide groove, where data is stored, is formed in a spiral manner, and each center of the plurality of the recording layers is eccentric to a center of the multi-layer data storage medium in a different direction. | 06-11-2009 |
20090190453 | SOLID IMMERSION LENS (SIL) NEAR-FIELD SYSTEM AND METHOD OF CONTROLLING TILT - In a near-field optical recording/reproducing system and a method of controlling a tilt, the near-field optical recording/reproducing system includes: a light source; an objective lens to focus light emitted from the light source to transmit near-field light to an information storage medium; a PD (photodetector) to receive a portion of the light that is transmitted from the objective lens to the information storage medium and is reflected from the information storage medium, to detect a GES (gap error signal) used for controlling an air gap formed between the objective lens and the information storage medium; a signal processor/determiner to obtain an edge voltage using the GES detected by the PD and determine a tilt control point using the edge voltage; and an adjuster to control a relative tilt between the objective lens and the information storage medium in the tilt control position. | 07-30-2009 |
20090262618 | TILT ADJUSTING METHOD AND INFORMATION RECORDING/REPRODUCING APPARATUS USING THE SAME - [Problems] To effectively perform optimal tilt adjustment. [Means for Solving the Problems] A tilt adjusting method adjusts a tilt angle of an actual incident light and reflected light with respect to an incident light and a reflected light under optimal tilt when recording and reproducing data onto/from an information recording medium. Two or more output signals having a balance between a signal component and a noise component changing with respect to a parameter of a correction object are extracted from the reproduction signal of the information recording medium and the signal component and the noise component are evaluated for performing signal correction, thereby calculating a first and a second coefficient. When the first coefficient is out of a set reference range, the tilt adjustment is performed by the first coefficient and when the first coefficient in the set reference range, the tilt adjustment is performed by the second coefficient. | 10-22-2009 |
20090296550 | OPTICAL RECORDING-REPRODUCING APPARATUS - An optical recording-reproducing apparatus comprises a laser beam source; an objective lens for focusing a laser beam from the laser beam source on a disk medium; an actuator for positional control of the objective lens; a tilt-compensating mechanism for adjusting inclination of the objective lens relative to the disk medium; a detecting element for detecting an amount of a change of the power of the laser beam for recording of information on the disk medium, wherein the tilt-compensating mechanism adjusts inclination of the objective lens according to the amount of the change of the power of the laser beam when the recording is carried out. | 12-03-2009 |
20100202266 | RECORDING DEVICE AND METHOD, COMPUTER PROGRAM, AND RECORDING MEDIUM - A recording apparatus ( | 08-12-2010 |
20110002208 | OPTICAL DISK DEVICE AND TILT CORRECTION METHOD FOR OPTICAL DISK DEVICE - An optical disk device has: a detector ( | 01-06-2011 |
20110235486 | OPTICAL DISC DRIVE AND METHOD FOR DETECTING VERTICAL DEVIATION THEREON - An optical disc drive includes a disc holder, a pickup head, a focus servo, an S-curve identifying unit, a first counter, a second counter, a judging unit, a disc identifying unit, and a system controller. The optical disc drive can detect whether a disc exhibits vertical deviation. Upon detection, the optical disc drive restricts the maximum speed of data reading and writing. The judging unit determines whether the disc exhibits vertical deviation based on a comparison result of the number of the one or more S curves with a first preset value. | 09-29-2011 |
20120127844 | 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. | 05-24-2012 |
20120140608 | METHOD FOR DETECTING OBLIQUITY OF OPTICAL DISC DRIVE BASED ON FUNCTION BETWEEN OBLIQUITY AND CENTRAL ERROR SIGNAL BIAS - A method for detecting an obliquity of an optical disc drive is disclosed. The method includes the following steps: setting up and storing a function between the obliquity and a central error signal bias by performing a current level calibration upon a plurality of obliquities of the optical disc drive predetermined to be tested to obtain corresponding central error signal biases; performing the current level calibration upon an objective lens of the optical disc drive; obtaining a calibrated central error signal bias; and acquiring the obliquity of the optical disc drive by interpolating or extrapolating the calibrated central error signal bias according to the stored function between the obliquity and the central error signal bias. | 06-07-2012 |
20130135976 | OPTICAL INFORMATION RECORDING MEDIUM, OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE, AND RECORDING METHOD - To carry out a track control by compensating for an offset caused by a radial tilt when a track control of a main beam is carried out by detecting tracking information provided at a reference layer of a spatial recording medium by a guide beam, there are formed a first mark pair row aligned with the first mark pairs in a radius direction by a track pitch, and other mark pair row aligned with the second mark pairs in the radius direction by the track pitch. The other mark pair row is arranged in the radius direction by being shifted from the first mark pair row by a prescribed distance. The track control is made to be able to carry out by dispensing with an uncontrollable region by selecting one of plural track error signals generated from the plural mark pairs. | 05-30-2013 |
20140064050 | SKEW DETECTION METHOD AND OPTICAL DISC DEVICE - There is provided a skew detection method including supplying reproduction signals, which are respectively reproduced approximately simultaneously from at least two tracks including a first adjacent track and a second adjacent track located on both sides of a main track, to first and second filters, causing a combining unit to combine output signals of the first and second filters with a reproduction signal which is reproduced from the main track approximately simultaneously with the first adjacent track and the second adjacent track so as to cancel crosstalk, causing a coefficient control unit to obtain an error with a target value of the output signal of the combining unit and control coefficients of the first and second filters so as to reduce the error, and detecting a skew of an optical disc from values of coefficients of predetermined taps of the first and second filters. | 03-06-2014 |