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| Number | Title | Issue Date |
| 8179751 | Method and device for sensitivity compensation Method and device for generating a control voltage for a position actuator of a disk drive system for displacing a lens of a pick-up unit to a given X-position. The actuator is operated by an open loop control system. First, parameters of the control system are cali... | 05/15/2012 |
| 8179752 | Optical disc apparatus therefor There is a need to accurately lock focus of a laser beam onto a target data layer of a multilayer optical disc. The above need can be addressed by, for example, performing a focus lock operation after a spherical aberration correction amount is set in such a way as ... | 05/15/2012 |
| 8134895 | Circuit for generating tracking error signal A circuit for generating a tracking error signal is provided. The circuit includes a digitized circuit, a short signal removing circuit and phase comparator. The digitized circuit receives first and second pick-up signals outputted from a pick-up head, and respectiv... | 03/13/2012 |
| 8094527 | Optical disk apparatus An optical disc apparatus includes: a first signal generating portion which generates a first signal that is obtained by processing signal which is output from the photo detecting portion, and which shows a peak in case where a focus position of an objective lens is... | 01/10/2012 |
| 8068389 | Tracking error signal detection device and optical disc apparatus A tracking error signal detection device employing a differential phase detection method includes first and second differentiators which remove direct current components in first and second signal groups in which a phase difference between the first and second signa... | 11/29/2011 |
| 7990815 | 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... | 08/02/2011 |
| 7969830 | Near field optical disc and near field optical disc reading apparatus A near field optical disc and a near field optical disc reading apparatus are provided. The near field optical disc has at least one light source and a near field optical pick-up head, and the near field optical disc includes a light guiding substance, a first refle... | 06/28/2011 |
| 7957232 | Gap controller and optical information processor A gap controller according to the present invention can set a reference level reasonably for a gap control that needs to be done to keep the gap between a solid immersion lens (SIL) and an optical disc constant. With the gap varied at a substantially regular step, g... | 06/07/2011 |
| 7920445 | Optical disc signal processing apparatus, and medium having program recorded thereon for controlling optical disc apparatus An optical disc signal processing apparatus comprising: a binarizing circuit configured to compare a level of an RF (Radio Frequency) signal obtained by photoelectrically converting a reflected light of a laser beam applied to an optical disc and a level of a DC sig... | 04/05/2011 |
| 7911890 | Optical disk unit An optical disc drive includes: an optical branching element for splitting light from a light source into main and sub-beams; a condenser element for condensing the main and sub-beams; a photodetector section including photodetectors to receive reflected portions of... | 03/22/2011 |
| 7859954 | Optical disk apparatus with approximate focus control of laser beam An optical disk apparatus is constructed for writing or reading information by irradiating a laser beam onto an optical disk while rotating the optical disk under a focus control of the laser beam relative to the rotated optical disk. In the optical disk apparatus, ... | 12/28/2010 |
| 7843775 | Optical disc apparatus and focusing method for the same An optical disc apparatus and a focusing method for the same prevent a focusing start error of an optical pickup when using a ring-shaped lens to handle multiple wavelengths, and allow the optical pickup to start focusing at the correct starting time. To write and/o... | 11/30/2010 |
| 7813229 | Gain setting method for optical disk reproducing apparatus A gain setting method for setting a gain in an amplifier that amplifies signals obtained from an optical disk, which includes: a measuring step for measuring an output level of the amplifier; and a gain setting step for setting the gain as the value of the target le... | 10/12/2010 |
| 7813230 | Optical recording medium driving apparatus and optical recording medium driving method When a type of an optical disc is discriminated by disc type discriminating processing, search operation by a CD light beam is carried out in CD discriminating processing, and a distance from a position xf where a large signal change of a first time is detected as a... | 10/12/2010 |
| 7800987 | Optical pickup driving apparatus and optical pickup beam spot positioning method In an optical pickup driving apparatus and method, a moving device is controlled when an objective lens is moved toward a recording surface and it is detected that the voltage of the focus error signal has reached a slice level voltage H corresponding to displacemen... | 09/21/2010 |
| 7715288 | Optical disk apparatus and data read-out control method An optical disk apparatus includes an optical pickup head (PUH) which outputs a laser beam through an objective lens. When a control unit receives an instruction to halt data read-out from an optical disk, the control unit moves the PUH to a predetermined position, ... | 05/11/2010 |
| 7710837 | Method for determining focusing error gain for accessing to optical disc A label side of a light-scribe optical disc includes a control feature zone recording therein reference information of the optical disc and a label zone to be marked based on the reference information. An optical head is moved in the label zone to determine a first ... | 05/04/2010 |
| 7672199 | Close focus algorithm in a digital focus servo system A focus servo system with a focus close algorithm is disclosed. The focus close algorithm provides a bias control effort to the focus servo system when focus is closed. A method of closing focus includes positioning an optical pick-up unit at a first position away f... | 03/02/2010 |
| 7668050 | Tracking error control system and method A tracking error control system includes a tracking error signal generator in communication with an optical pickup head, a DC detector in communication with the tracking error signal generator and a comparator in communication with the DC detector and the tracking e... | 02/23/2010 |
| 7668052 | Apparatus and method for detecting tracking error signal using multiple phase clocks An apparatus and method for digitally detecting a tracking error signal using multiple phase clocks. The apparatus includes a phase extractor receiving four divided outputs in response to light reflected from an optical disk and extracting four divided phases, respe... | 02/23/2010 |
| 7668051 | Methods, apparatus and computer program products for detecting oscillation of a servo controller An apparatus for detecting an oscillation of a servo controller of an optical disk is provided. An oscillation detector, electrically coupled to the servo controller of the optical disk, is provided and is configured to receive an error signal associated with the se... | 02/23/2010 |
| 7630278 | Focusing control method for reading/writing optical disc An optical reading/writing apparatus has an optical head that includes a collimator and a lens. For efficient and reliable focusing control for writing an empty optical disk, calibration of focus offset and spherical aberration is executed by setting a boundary and ... | 12/08/2009 |
| 7613081 | Control of stepper motor in an optical disc A method for controlling a stepper motor in an optical disc system, comprising the steps of (A) measuring a static offset of a center error signal, (B) measuring a maximum value, minimum value and an average value of the center error signal in response to rotating t... | 11/03/2009 |
| 7577063 | Calibration of a focus offset in an optical drive Calibration of a focus offset in an optical drive. A calibration pattern, comprising a plurality of marked areas, is marked upon a medium. A user input is received, identifying a perceived darkest marked area of the calibration pattern. The focus offset is determine... | 08/18/2009 |
| 7505379 | Intelligent layer jump method An intelligent layer jump method applied when an optical disc drive accesses a disc. The disc has a central reference point, at least a first recoding layer and a second recoding layer. The first recoding layer has a plurality of first tracks, while the second recod... | 03/17/2009 |
| 7489602 | Apparatus and method for layer jump braking control in an optical drive An apparatus and method for layer jump braking control is disclosed. The apparatus is applied to an optical drive and generates a non-fixed braking signal according to a focusing error signal. The non-fixed braking signal is provided to a driver for outputting a cor... | 02/10/2009 |
| 7480217 | Method and apparatus for adjusting tracking error balance in an optical disk reproducing apparatus A method and apparatus for adjusting tracking error balance in an optical disk reproducing apparatus are provided. The method includes pre-setting a tracking error balance for an optical recording medium and adjusting the tracking error balance during reproduction o... | 01/20/2009 |
| 7463560 | Optical disc device In an optical disc device of the present invention, time differences among the focus error signal corresponding to the surface of the optical disc, the focus error signal corresponding to the first reflection layer, and the focus error signal corresponding to the se... | 12/09/2008 |
| 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 |
| 7436380 | Electronic Apparatus with level detecting function An electronic apparatus with level detecting capability has an electronic component, a light-sensing device for sensing light, a light source for emitting light onto the light-sensing device, a light blocker for blocking light emitted by the light source from projec... | 10/14/2008 |
| 7433279 | Layer jump control device and method of high-speed optical drive A real-time wobble detector and an adaptive layer distance balancing calculator are added in a layer jump control device of a high-speed optical drive to solve failure and instability caused by the wobble effect of the optical drive during layer jump. A layer jump c... | 10/07/2008 |
| 7421359 | Detecting back electromotive force voltage A Bemf detect circuit is configured for modeling Bemf error via calculation of time correlations associated with two or more different non-calibrated sense resistor gain values to derive a calibrated sense resistor gain value. A method is provided for calibrating a ... | 09/02/2008 |
| 7411876 | Apparatus and method for controlling tracking in disc drive by monitoring tracking actuator deviation An apparatus and method of controlling tracking in a disc drive using a tracking actuator, a feed motor, and an objective lens, including monitoring whether the tracking actuator deviates from a dynamic range based on a signal controlling the feed motor when trackin... | 08/12/2008 |
| 7397735 | Optical disk device capable of preventing collision between disk and objective lens, and control method thereof The magnitude (Ga) of an impact applied to a lens holder is constantly monitored based on an output of an impact sensor. When it is determined that Ga exceeds Gth, focus servo is released, and the lens holder is provided with a force to make it move away from a disk... | 07/08/2008 |
| 7394741 | Optical disc reading and reproducing apparatus An optical disc reading and reproducing apparatus includes reading means for reading data recorded on an optical disc by applying laser light through an objective lens and detecting its reflected light, focus control means for performing focus control for moving the... | 07/01/2008 |
| 7395462 | Defect estimation apparatus and related method A weighted defect estimating apparatus and a related method for determining a defect estimation value are disclosed. The weighted defect detecting apparatus includes: a defect detecting unit for generating a defect value when a defect in a predetermined region of an... | 07/01/2008 |
| 7385886 | Optical disk drive and method of controlling spindle motor thereof An optical disk drive and a method thereof for controlling an optical disk drive spindle motor to adaptively stop the rotation according to the varying level of a detected tracking error signal. The optical disk drive directs the operation of the spindle motor by co... | 06/10/2008 |
| 7385895 | Method of discriminating optical disc type and apparatus thereof A method of discriminating an optical disc type and an apparatus thereof. The method for an optical disc system of recording and/or reproducing an optical disc that includes an optical pickup having a laser diode, an object lens, and a light receiving device, checks... | 06/10/2008 |
| 7382698 | Optical information recording/reproducing apparatus having tilt correction mechanism and method therefor An optical information recording/reproducing apparatus and are provided under a state where a focus servo is driven, a tracking error signal recorded on the recording medium or a sum signal of a photodetector is generated from a pencil of light guided onto the photo... | 06/03/2008 |
| 7366063 | Optical discs for measuring analytes This invention directs to an optical disc assembly configured to receive an analyte which can be detected by a standard optical disc reader or an optical disc reader modified therefrom. The optical disc assembly may preferably be designed so that the optical disc re... | 04/29/2008 |
