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| Number | Title | Issue Date |
| 8174938 | Optical disc apparatus and method of controlling the same An optical disc device includes a position detector which detects a position of the pickup in accordance with a output signal from the first light receiver of a position sensor which receives light from a encoder board, a rotation position detector which detects a r... | 05/08/2012 |
| 8169863 | Tracking control device, tracking control method, and optical disc device An object of this invention is to improve stability of tracking control and improve recording and reproduction performance. The tracking control device comprises a main push-pull signal generation section, which generates a main push-pull signal based on a signal ob... | 05/01/2012 |
| 8130601 | Optical disk device This optical disk device includes a pickup, an offsetting means, a focus servo means, a layer jump means, and a shift means. The pickup irradiates laser light upon an optical disk having a plurality of recording layers via a correction lens and an objective lens, an... | 03/06/2012 |
| 8009522 | Focusing servo device, optical disc recording/reproducing device and focus-searching method A focusing servo device, an optical disc recording/reproducing device and a focus-searching method are provided for making a focus of an energy beam emitted by a pick-up unit to fall in an accessible range of a data layer of a disc. The method comprises the followin... | 08/30/2011 |
| 8000181 | Beam irradiation device and laser radar A beam irradiation device includes a light source for emitting laser light, an actuator for displacing a propagation direction of the laser light in accordance with a control signal, and a scan expansion lens for increasing a swing width of the laser light to be gen... | 08/16/2011 |
| 7978568 | Optical head, diffraction device, objective lens, and optical disc apparatus An object of the present invention is to reduce the influence of a stray light incident on a light receiving device by reflection of an unnecessary diffraction light not contributing to write or read on a disc surface at write or read of an optical disc having a lar... | 07/12/2011 |
| 7944782 | 90°-bent metallic waveguide having tapered c-shaped aperture, method of fabricating the waveguide, light delivery module including the waveguide, and heat assisted magnetic recording head having the waveguide A metallic wave guide and a light delivery module are provided. The metallic waveguide includes a metal body formed of a conductive metal and having an aperture formed therethrough, the aperture having input and output ends. The aperture has a bent portion for chang... | 05/17/2011 |
| 7881164 | Sync mark detection with polarity uncertainty Systems and methods for detecting a disk sync mark are provided. The systems and methods for detecting the disk sync mark rely on a detecting the disk sync mark on at least one timing interval. A window of data read bits from a particular disk sector are examined to... | 02/01/2011 |
| 7869312 | Calibration based DC coupled analog front end for optical storage system A driver circuit for use with a variety of OPU circuits has both a single-ended input and a differential input. The single-ended input is coupled to a single-ended signal path having a variable gain stage and a variable level shifter. The differential input is coupl... | 01/11/2011 |
| 7848185 | Optical pickup An optical pickup includes a blue laser source; a red laser source; an infrared laser source; a blue light objective lens focusing blue light emitted from the blue laser source onto an optical storage medium; and a red and infrared light objective lens focusing red ... | 12/07/2010 |
| 7773467 | Optical disk device A drive stoppage command unit commands a drive unit to stop driving a pickup head, and an objective lens of a pickup head, when it has decided that the power supply voltage of operating power which is being supplied by a first power supply unit to a servo control un... | 08/10/2010 |
| 7768878 | Actuator calibration using a focus error signal A lens actuator is calibrated by inputting a signal to the actuator to cause the actuator to move a lens from a first location to a second location, sensing a focus error signal generated in response to the movement of the lens, determining a distance moved by the l... | 08/03/2010 |
| 7755985 | Optical pickup device and optical disk drive An advantage of the present invention is that it provides an optical pickup device including a first condensing member that condenses light from a first light source; a second condensing member that condenses light from a second light source; a holder that has the f... | 07/13/2010 |
| 7724614 | Optical pickup actuator Provided is an optical pickup actuator. The optical pickup actuator includes: a lens holder for holding an object lens; a focusing coil disposed at the lens holder; a tracking coil disposed at the lens holder; a radial coil wound at a coil holder at which the focusi... | 05/25/2010 |
| 7558160 | Demodulation of a focusing error signal during a focus search for a lens focusing control in an optical disc system A method for demodulating a focusing error signal in an optical disc system, comprising the steps of (A) generating a beam strength signal and the focusing error signal, (B) sampling the beam strength signal and the focusing error signal at an appropriate sampling r... | 07/07/2009 |
| 7542382 | Optical pick-up head, optical information apparatus, and optical information reproducing method An optical information apparatus of the present invention includes: an optical pick-up head including: a light source; a diffraction unit; a condensing unit; a beam splitter; a photodetector; and a tracking error signal generator. An optical recording medium has tra... | 06/02/2009 |
| 7539087 | Optical disk apparatus The present invention provides an optical disk apparatus adapted to irradiate a predetermined track reliably with a laser beam in a seeking operation independently of the individual differences between tracking actuators and therefore optical pickups. A signal adjus... | 05/26/2009 |
| 7522482 | Optical pickup device and apparatus for reading data from optical storage medium An optical pickup is provided for preventing an objective lens from colliding with an optical recording medium at the stage of initial adjustments. The optical pickup device comprises a servo circuit, and a lens driver for driving an objective lens. In the servo cir... | 04/21/2009 |
| 7489600 | Object lens driving device with reduced tilt during focusing and tracking operations and optical pickup and optical disk drive utilizing the same An object lens driving device with reduced tilt even when focusing and tracking operations are performed simultaneously . The object lens driving device includes a movable unit with an object lens and an object lens holding member lens, elastic supporting rods arran... | 02/10/2009 |
| 7460444 | Optical disk drive and method for controlling sled motor within optical disk drive An optical disk drive is composed of comprising a tracking actuator, a sled motor, a sled filter developing an output corresponding to low frequency components of displacement of the tracking actuator, a pulse generating unit responsive to the output of the sled fil... | 12/02/2008 |
| 7443780 | Optical pickup device and optical disk device having a diffraction element so that a first light beam and a second light beam comport with each other An optical pickup device is adapted to read information signals from optical recording media of two different types such as a “DVD” and a “CD” for which two light beams with different wavelengths are used and comprises a photodetector having a single light r... | 10/28/2008 |
| 7440361 | Optical pickup apparatus An optical pickup apparatus including a swing arm pivotably installed in a tracking direction with respect to a disc, and an optical pickup unit supported by the swing arm and driven in a focusing direction, wherein the optical pickup unit includes a laser diode, an... | 10/21/2008 |
| 7440383 | Optical pickup device and recording and/or reproducing apparatus An optical pickup device includes an objective lens (2), with a numerical aperture (NA) being not less than 1, having a solid immersion lens (1) which is made up by a spherical portion (1a) and a flat portion (1b) parallel t... | 10/21/2008 |
| 7414926 | Optical head device that prevents the displacement of the optical axis caused by expansion or contraction due to temperature change An optical head device including a photo detector and an optical system which converges a laser beam emitted by a laser light source onto an optical recording medium and also guides a returning beam from the optical recording medium to the photo detector. The optica... | 08/19/2008 |
| 7411872 | Servo-tracking and three-dimensional alignment in page-based data optical storage A system for page-based optical data storage includes a sensor array positioned to track a data page when the data page is optically read from or recorded to a storage medium. A servo mechanism is used to position the sensor array. A plurality of alignment points ar... | 08/12/2008 |
| 7400557 | Optical disk recording and reproducing apparatus The present invention provides an optical disk recording and reproducing apparatus having a circuit configuration whereby it is possible to prevent tracking drive signals from being offset even when the temperature of a tracking actuator drive circuit is increased. ... | 07/15/2008 |
| 7400821 | Device and method for reproducing photographic sound recordings For a reproduction of optical sound information in a double variable-area track (DZ) an optoelectronic converter device scans the optical sound track of a film. The converter device generates a digital image signal for buffer storage in the memory of a program-contr... | 07/15/2008 |
| 7391701 | Methods and systems for in-track optical positioning Methods and systems for formatting of optical media used for data or information storage. ... | 06/24/2008 |
| 7388815 | Wiring layout structure for optical head device A fixture plate is fixed by a screw onto an optical housing of the optical head device at a portion corresponding to where a monitor signal path portion and an act signal path portion are arranged overlapping one another. The two signal path portions are portions of... | 06/17/2008 |
| 7379405 | Method and optical disk drive for promptly protecting voice coil motor thereof from over current The invention is disclosed a method for promptly protecting a voice coil motor in an optical disk drive. A step (A) allows a data signal processor (DSP) to execute a protect module of the voice coil motor every preset time interval. In a step (B), the DSP executes f... | 05/27/2008 |
| 7376063 | Control circuit of optical storage device and method thereof A control circuit of an optical storage device includes a loop phase calculation unit for calculating a closed loop phase of a servo system according to at least one error signal of the servo system and a system control unit coupled to the loop phase calculation uni... | 05/20/2008 |
| 7369335 | Optical pickup actuator An optical pickup actuator includes a bobbin, support members, and a pair of magnetic circuits. An objective lens is mounted on the bobbin. The support members have first ends fixed on sides of the bobbin and second ends fixed to a holder placed on a portion of a ba... | 05/06/2008 |
| 7369466 | Optical pickup apparatus and method for controlling phases of three beams An optical pickup apparatus and method are provided. The apparatus and method include a light source unit having a holder in which an optical module having first and second light sources for emitting light having different wavelengths and a grating are installed, an... | 05/06/2008 |
| 7362691 | Optical disc having tracking polarity information, and apparatuses and methods for recording and reproducing user data on the same An optical disc includes tracking polarity information. The optical disc includes a clamping area, a lead-in area, a data area, and a burst cutting area (BCA). The BCA is present between the clamping area and the lead-in area and in which information regarding the o... | 04/22/2008 |
| 7359420 | Manufacturable vertical extended cavity surface emitting laser arrays Arrays of vertical extended cavity surface emitting lasers (VECSELs) are disclosed. The functionality of two or more conventional optical components are combined into an optical unit to reduce the number of components that must be aligned during packaging. A dichroi... | 04/15/2008 |
| 7359295 | Optical pickup apparatus and optical disk drive apparatus An optical pickup apparatus for reproducing information from an optical disk, includes: a semiconductor laser applying a beam to an optical disk having two recording layers through an objective lens; and a light receiving device to which light reflected from the opt... | 04/15/2008 |
| 7359307 | Catadioptric objective system and objective system A catadioptric objective system used for storage and/or reproduction of information by use of an optical near field. The catadioptric objective system is composed of a catadioptric objective lens and a light transmitting plate. The lens has a first surface and a sec... | 04/15/2008 |
| 7355953 | Optical pickup for cutting off optical noise and optical recording and/or reproducing apparatus using the same An optical pickup includes a light source which emits light, a grating which separates a portion of the light emitted from the light source, a reflecting member which reflects another portion of the light emitted from the light source, a monitoring photodetector dis... | 04/08/2008 |
| 7355941 | Information recording method and optical disk apparatus for recording information on a recording-type optical disk An information recording method includes the steps of carrying out an experimental write on both inner-peripheral and outer-peripheral experimental writing areas, in the case of the outer-peripheral experimental writing, a constant recording power computed on the ba... | 04/08/2008 |
| 7352669 | Method and device for disc rotation control in an optical storage system based on detected extent of disc warping A digital signal processing device is provided for disc rotation control in an optical storage system, which is capable of generating a focusing error signal from light that was reflected by an optical disc loaded in the optical storage system. The digital signal pr... | 04/01/2008 |
