| Patent Number |
Title Of Patent |
Date Issued |
| 7372794 |
Compatible optical pickup applying tilt to objective lens in proportion to radial movement of ob |
May 13, 2008 |
| A compatible optical pickup compatibly using a high density recording medium and at least one low density recording medium, includes an objective lens to form a light spot suitable for use on a recording surface of the high density recording medium by focusing a corresponding inciden |
| 7349311 |
Method and apparatus for detecting radial tilt |
March 25, 2008 |
| A method of, and an apparatus for detecting a radial tilt of a disc. Phases of summed signals obtained from signals that external light-receiving units of an octant photo diode receive are compared to generate an external phase comparison signal Do. Phases of other summed signals obt |
| 7319643 |
Method for detecting servo error, apparatus therefor, disk which maintains quality of servo erro |
January 15, 2008 |
| An apparatus for recording data on and reproducing data from the disk in which a recording area is divided into sectors, includes a reproducing signal generator for generating a reproducing signal including sum signals V1 and V2 of radial pairs, a sum signal RF_sum, and a push-pull s |
| 7310291 |
Method and apparatus for tracking error detection in optical disk driver |
December 18, 2007 |
| A method and apparatus for tracking error detection in an optical disk reproduction system. The tracking error detecting apparatus generates a tracking error signal as a difference signal of optical detection signals generated by more than two optical detectors positioned along a diagona |
| 7304915 |
Actuator for optical disk system and apparatus for providing signal for driving the actuator |
December 4, 2007 |
| An actuator of an optical disk system and an apparatus producing a signal for driving the actuator, the actuator including a light source, with which information is recorded on or reproduced from an optical disk surface. In the actuator, an inner focusing coil and an outer focusing c |
| 7286447 |
Recording and/or reproducing apparatus and method of controlling the same |
October 23, 2007 |
| A recording and/or reproducing apparatus and a method of controlling the same. The method of controlling the apparatus for recording information in or reproducing information from a disc having a wobbled track, the method includes detecting a wobble signal recorded in the wobbled track, |
| 7280458 |
Optical pickup apparatus and optimal light spot focusing method |
October 9, 2007 |
| An optical pickup apparatus includes a first light source to emit a first light beam having a predetermined wavelength, a first optical path changer to change a proceeding path of the first light beam, an objective lens to focus the first light beam on a recording medium, a diffraction |
| 7224651 |
Physical identification data addressing method using wobble signal, wobble address encoding circ |
May 29, 2007 |
| A physical identification data (PID) addressing method using a wobble signal, a wobble address encoding circuit, a method and circuit for detecting the wobble address and a recording medium therefor. Groove address information indicating physical identification information is phase m |
| 7184373 |
Adaptive focusing method and apparatus |
February 27, 2007 |
| An adaptive focusing apparatus and method thereof of an optical disc drive having a focus servo controller moves a pickup head to an optimal focus point. A disc driver rotates an optical disc and includes a reflected signal detector detecting a signal reflected from the optical disc by t |
| 7170836 |
Error signal detection apparatus and method for optical recording/reproducing system |
January 30, 2007 |
| An error signal detection method includes detecting light incident through an objective lens after having been reflected and diffracted from a recording medium, as eight light portions in a matrix including four inner light portions and four outer light portions, wherein the rows and |
| 7170834 |
Method and circuit for detecting playback signal which is compensated for time delay |
January 30, 2007 |
| A method of and a circuit for providing a playback signal, which is compensated for time delay, from a photodetector having a plurality of outputs. A time difference between a first signal corresponding to a part of the outputs of the photodetector and a second signal corresponding to |
| 7167424 |
METHOD FOR DETECTING SERVO ERROR, APPARATUS THEREFOR, DISK WHICH MAINTAINS QUALITY OF SERVO ERRO |
January 23, 2007 |
| A method of detecting a servo error, an apparatus therefor, a disk which maintains quantity of a servo error signal, a method of controlling a servo of an apparatus for recording data on and reproducing data from a disk, a method of detecting the tracking error, and a method of detecting |
| 7133342 |
Method and apparatus for determining a type of disk |
November 7, 2006 |
| An optical recording/reproducing apparatus and method to determine a type of disk including a photodetector divided into at least two light receiving sections in a radial direction. A radial subtractor generates a radial push-pull signal from a difference between light receiving signals |
| 7120095 |
Apparatus for generating seek direction detecting signal using track error and track cross signa |
October 10, 2006 |
| An apparatus to generate a seek direction detecting signal for an optical pickup to determine a position of a center of an optical spot focused on an optical disk relative to a center of a track, which focuses a main beam on a first optical detector and a sub-beam having a predetermined |
| 7110334 |
Method for detecting servo error, apparatus therefor, disk which maintains quality of servo erro |
September 19, 2006 |
| An apparatus for recording data on and reproducing data from the disk in which a recording area is divided into sectors, includes a reproducing signal generator for generating a reproducing signal including sum signals V1 and V2 of radial pairs, a sum signal RF_sum, and a push-pull s |
| 7102967 |
Method and apparatus for tracking error detection in optical disk driver |
September 5, 2006 |
| A method and apparatus for tracking error detection in an optical disk reproduction system. The tracking error detecting apparatus generates a tracking error signal as a difference signal of optical detection signals generated by more than two optical detectors positioned along a diagona |
| 7095686 |
Defocus error signal detection apparatus having phase comparators and a matrix circuit for an op |
August 22, 2006 |
| An error signal detection apparatus for an optical recording/reproducing system including a light source emitting a light beam and an objective lens focusing the light beam to form a light spot on a recording medium, the apparatus including: a photodetecting unit dividing at least a part |
| 7092329 |
Physical identification data addressing method using wobble signal, wobble address encoding circ |
August 15, 2006 |
| A physical identification data (PID) addressing method using a wobble signal, a wobble address encoding circuit, a method and circuit for detecting the wobble address and a recording medium therefor. Groove tracks are classified into odd groove tracks and even groove tracks. Address |
| 7035178 |
Apparatus and method for generating tracking error signal |
April 25, 2006 |
| An apparatus for and a method of producing a push-pull tracking error signal in an optical disc system having four light-receiving sections A, B, C, and D arranged in a radial direction of the optical disc. Pairs of signals P.sub.A, P.sub.B, P.sub.C and P.sub.D, corresponding to light |
| 7009921 |
Method and circuit for detecting playback signal which is compensated for time delay |
March 7, 2006 |
| A method and circuit for providing a playback signal which is compensated for time delay. The circuit includes a time delay compensator for detecting a time difference between outputs of a photodetector and temporally matching part of the outputs of the photodetector and another part |
| 6977982 |
Differential phase detection device and tracking error signal detection apparatus using the same |
December 20, 2005 |
| A differential phase detection device receives first through fourth detection signals from a photodetector and detects a differential phase signal therefrom, the differential phase detection device includes a slicer slicing and digitizing each of the detection signals with respect to |
| 6977876 |
Apparatus for and method of detecting defocus error signal for optical pickup and apparatus for |
December 20, 2005 |
| An apparatus for and a method of detecting a defocus error signal. First, second and third light receiving regions of a photodetector are arranged in a radial direction of a recording medium to independently perform photoelectric conversion with respect to incident light which is ref |
| 6961292 |
Apparatus generating a seek direction detecting signal for an optical pickup using track cross a |
November 1, 2005 |
| An apparatus generating a seek direction detecting signal includes a light dividing unit dividing an incident light beam into at least two beams having a main beam and a sub-beam so that at least two beam spots including a main beam spot and at least one sub-beam spot having an optic |
| 6940799 |
Method for generating a signal for detecting the direction of movement of a laser spot, and appa |
September 6, 2005 |
| A method and apparatus for detecting the direction of movement of a laser spot in an optical disc recording/reproducing apparatus having a photodetector divided into two or more sections, each of which is a light receiving device, aligned in a radial direction that includes detecting a |
| 6885621 |
Error signal detection apparatus and method for optical recording/reproducing system including c |
April 26, 2005 |
| An error signal detection method and apparatus for an optical recording/reproducing system. The error signal detection method includes: (a) detecting light incident through an objective lens after having been reflected and diffracted from a recording medium, as eight light portions a |
| 6813230 |
Physical identification data addressing method using wobble signal, wobble address encoding circ |
November 2, 2004 |
| A physical identification data (PID) addressing method using a wobble signal, a wobble address encoding circuit, a method and circuit for detecting the wobble address and a recording medium therefor. Groove address information indicating physical identification information is phase m |
| 6801486 |
Method and apparatus to generate a monitoring signal for an optical recording/reproducing system |
October 5, 2004 |
| At least part of a light beam reflected from an optical disc is divided into first through fourth light areas in directions corresponding to the radial and tangential directions of the disc, and first through fourth detection signals are output from the light areas. The first through |
| 6791920 |
Physical identification data addressing method using wobble signal, wobble address encoding circ |
September 14, 2004 |
| A physical identification data (PID) addressing method using a wobble signal, a wobble address encoding circuit, a method and circuit for detecting the wobble address and a recording medium therefor. A wobble signal obtained by phase modulating address information indicating the phys |
| 6754146 |
Error signal detection apparatus for an optical recording/reproduction system |
June 22, 2004 |
| An error signal detection apparatus for an optical recording/reproducing system including a light source emitting a light beam and an objective lens focusing the light beam to form a light spot on a recording medium, the apparatus including: a photodetecting unit dividing at least a part |
| 6751178 |
Optical recording medium and recording/reproduction method thereof |
June 15, 2004 |
| An optical recording medium and a recording/reproducing method therefor to stably and accurately address a basic recording and/or reproducing unit (a sector or a frame) when a track pitch is decreased for recording of a large capacity of data. The general information (e.g., a variable |
| 6744718 |
Physical identification data addressing method using wobble signal, wobble address encoding circ |
June 1, 2004 |
| A physical identification data (PID) addressing method using a wobble signal, a wobble address encoding circuit, a method and circuit for detecting the wobble address and a recording medium therefor. Groove tracks are classified into odd groove tracks and even groove tracks. Address |
| 6721243 |
METHOD FOR DETECTING SERVO ERROR, APPARATUS THEREFOR, DISK WHICH MAINTAINS QUALITY OF SERVO ERRO |
April 13, 2004 |
| A method of detecting a servo error, an apparatus therefor, a disk which maintains quantity of a servo error signal, a method of controlling a servo of an apparatus for recording data on and reproducing data from a disk, a method of detecting the tracking error, and a method of detecting |
| 6687201 |
Apparatus for generating seek direction detection signal |
February 3, 2004 |
| An apparatus for use in an optical disc includes an optical disc and an optical branching unit irradiating a main light beam and a sub-light beam, wherein the sub-light beam includes a optical aberration in a direction on a track of the optical disc. The apparatus further includes a |
| 6671238 |
Physical identification data addressing method using wobble signal, method of detecting wobble a |
December 30, 2003 |
| A physical identification data (PID) addressing method using a wobble signal, a wobble address encoding circuit, method and circuit for detecting the wobble address and a recording medium therefor. When addressing physical identification information on a recording medium, which has l |
| 6611482 |
Error signal detecting apparatus for optical recording/reproducing apparatus |
August 26, 2003 |
| An error signal detecting apparatus for an optical recording/reproducing apparatus, the error signal detecting apparatus including a photodetector to receive light reflected and diffracted by a recording medium, and a signal processor to detect an error signal by calculating a detection |
| 6584049 |
Device for reducing cross talk in signal detecting apparatus used in an optical pickup device |
June 24, 2003 |
| A tracking error signal detecting apparatus with improvement in offset due to gain characteristics and/or a difference in the depth between pits by providing an improved sectioning structure of an eight-sectional photodetector having inner and outer sectional plates, the radial widths |
| 6556521 |
METHOD FOR DETECTING SERVO ERROR, APPARATUS THEREFOR, DISK WHICH MAINTAINS QUALITY OF SERVO ERRO |
April 29, 2003 |
| A method of detecting a servo error, an apparatus therefor, a disk which maintains quantity of a servo error signal, a method of controlling a servo of an apparatus for recording data on and reproducing data from a disk, a method of detecting the tracking error, and a method of detecting |
| 6556520 |
METHOD FOR DETECTING SERVO ERROR, APPARATUS THEREFOR, DISK WHICH MAINTAINS QUALITY OF SERVO ERRO |
April 29, 2003 |
| A method of detecting a servo error, an apparatus therefor, a disk which maintains quantity of a servo error signal, a method of controlling a servo of an apparatus for recording data on and reproducing data from a disk, a method of detecting the tracking error, and a method of detecting |
| 6507544 |
Error signal detection apparatus and reproduction signal detection apparatus for optical recordi |
January 14, 2003 |
| An error signal detection apparatus for an optical recording/reproducing system which detects a tilt error signal and/or tracking error signal, based on the phase characteristics of light reflected and diffracted from a recording medium, and a method therefor. The error signal detection |
| 6469979 |
METHOD FOR DETECTING SERVO ERROR, APPARATUS THEREFOR, DISK WHICH MAINTAINS QUALITY OF SERVO ERRO |
October 22, 2002 |
| A method of detecting a servo error, an apparatus therefor, a disk which maintains quantity of a servo error signal, a method of controlling a servo of an apparatus for recording data on and reproducing data from a disk, a method of detecting the tracking error, and a method of detecting |
| 6400662 |
Method of detecting track cross signal of optical disc recording/reproducing device and apparatu |
June 4, 2002 |
| An optical recording/reproducing apparatus for determining a direction in which an optical pick-up moves, and detecting a track cross signal. The track cross signal is useful as a basis of determining tracking pull-in after searching a track. In the present track cross signal detecting |
| 6222802 |
Device and method for automatically controlling sled loop gain in optical disc drive |
April 24, 2001 |
| A device for automatically controlling a sled loop gain in an optical disc drive having a sled motor. The device includes a pickup for irradiating a laser beam onto an optical disc and receiving a reflected beam to read a signal recorded on the optical disc; a tracking error detector to |
| 6163516 |
Optical disc reproduction apparatus and method capable of correcting a characteristic of an equa |
December 19, 2000 |
| A disc reproduction apparatus and method to reproduce an optical disc using a constant linear velocity (CLV) method. The disc reproduction apparatus includes an equalizer to receive a signal read from the optical disc and equalizing the received signal according to an equalization contro |
| 6111843 |
Track zero cross signal generation apparatus for optical disk system |
August 29, 2000 |
| A track zero cross signal generation apparatus for use in an optical disk system receives a tracking error signal acquired when traversing tracks on a recording medium and generates a track zero cross signal. The track zero cross signal generation apparatus includes a booster which recei |
| 6067280 |
Track zero cross signal generation apparatus for optical disk system |
May 23, 2000 |
| A track zero cross signal generation apparatus for use in an optical disk system receives a tracking error signal acquired when traversing tracks on a recording medium and generates a track zero cross signal. The track zero cross signal generation apparatus includes a booster which recei |
