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| Number | Title | Issue Date |
| 8111600 | 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... | 02/07/2012 |
| 8098556 | Optical disc device An object of this invention is to measure the tilt quantity of, and perform a tilt control on, an optical disc accurately without depending on the rotation control method. An optical disc drive includes: a motor for rotating an optical disc; an optical system... | 01/17/2012 |
| 8098554 | Tilt detecting device and method An information recording and/or reproducing apparatus includes an optical head, an analog signal processor, an analog/digital converter, a controller and a digital/analog converter. The optical head is used for emitting a light beam on a medium and receiving a refle... | 01/17/2012 |
| 8098555 | Optical disk device with coma aberration correction The optical disc apparatus according to the present invention includes a tilt detecting means; a coma aberration correcting means; and a spherical aberration correcting means. Based on the result of a tilt detection, the amount of the correction performed by the com... | 01/17/2012 |
| 8068396 | Method for adjusting tilt of optical pick-up head A method for adjusting a tilt of an optical pick-up head includes the steps of: moving the optical pick-up head to a first location and focusing on; obtaining a first focus control power and a first optimum tilt angle at the first location; moving the optical pick-u... | 11/29/2011 |
| 8050162 | Tilt control method of near-field optical system A tilt control method for a near-field optical disc drive is provided. A gap between a lens and a disc is estimated. A tilt compensation for the lens is estimated according to a tilt signal when the lens is within a far-field region. A coarse tilt control is perform... | 11/01/2011 |
| 8045433 | Coil controlling for optical pick-up A pickup apparatus including: at least a coil constituting an actuator, a signal to be sent to the coil being obtained by calculation using an algorithm on the basis of at least one of a focus error signal and a tracking error signal. ... | 10/25/2011 |
| 8040774 | Optical disk device and tilt correction method for optical disk device An optical disk device has: a detector (11) that converts a reflected light from an optical disk (5) and a reflected light of an incident light from a light source (1) side of a solid immersion lens (4), into electric signals and outputs ... | 10/18/2011 |
| 7995437 | Optical pick up and optical disc apparatus An optical pickup includes: a light source emitting a beam having a predetermined wavelength; a plastic objective lens condensing the emitted beam on an optical disc; a light detector receiving and detecting the beam reflected by the optical disc; an objective-lens ... | 08/09/2011 |
| 7936652 | Optical disc apparatus For achieving an improvement on recording/reproducing quality of information, with enabling more adequate tilt adjustment, even for an optical disc to be used under a circumstance having a large temperature change, an optical disc apparatus for conducting recording ... | 05/03/2011 |
| 7933181 | Method and system for radial and tangential tilt calibration of optical storage systems A system and method for adjusting the radial tilt, tangential tilt, or a combination of radial and tangential tilt of an optical detection unit in an optical disc reading system can include applying different weighting factors to different signal components dependin... | 04/26/2011 |
| 7924671 | 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... | 04/12/2011 |
| 7898919 | Optical pickup apparatus An optical pickup apparatus reading signal recorded on signal recording layer of first and second optical discs different in distance from incident surface of laser light to the layer, comprising: an objective lens to be changed in numerical aperture for reading sig... | 03/01/2011 |
| 7869320 | Method and device for performing tilt correction using multi-dimensional actuator In a method and device for performing tilt control, a focus and a tilt controlling output is generated, and a focusing and tilt state of an optical recording/reproducing beam is controlled by determining a radial tilt value based on a differentiation of focus contro... | 01/11/2011 |
| 7817516 | Detection method for tilt of optical pickup head A method is used for detecting a tilt of an optical pickup head. The method includes the steps of: capturing a plurality of images; converting the images to bitmap images; superposing the bitmap images together to form an superimposed bitmap image; setting a two-dim... | 10/19/2010 |
| 7808866 | Apparatus and method for recording/reproducing data on/from a recording medium There is provided an apparatus for recording/reproducing data on/from a recording medium including: a pickup unit including an objective lens and a solid immersion lens(SIL) to allow a light to be incident onto a recording medium; a photoelectric element for receivi... | 10/05/2010 |
| 7808865 | Method for estimating power compensation and recording power of a tilting disk The method for estimating recording power Pow_tilting of a tilting part of a tilting disk is shown based on a power compensation formula: Pow_comp=A*(A*K). After a focus error (FE) signal of the tilting part of the tilting disk is manipulated as a focus servo output... | 10/05/2010 |
| 7796484 | 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 r... | 09/14/2010 |
| 7787340 | Optical pickup The optical pickup includes two objective lenses, and an objective lens holder that holds the two objective lenses. The objective lens holder has two fixture holes that pass through from the lower surface to the upper surface to which the two objective lenses are at... | 08/31/2010 |
| 7773475 | Optical pickup actuator and optical recording/reproducing apparatus having the same An optical pickup actuator includes a lens holder on which a plurality of object lenses to use in recording/reproducing information onto/from different kinds of optical media are mounted, a tilting unit tilting the lens holder, and a controller controlling the tilti... | 08/10/2010 |
| 7755991 | Method for detecting radial tilt of optical recording medium in optical head device, optical head device, and optical information recording/reproducing device The light emitted from a semiconductor laser is divided by a diffractive optical element into three light beams which are 0th-order light as the main beam and ±1st-order diffracted lights as the sub-beams, and the track error signals by the main beam and the sub-be... | 07/13/2010 |
| 7755992 | Method and apparatus for controlling tilt in an optical disc device A method and apparatus for controlling tilt in an optical disc device are provided. The method includes determining tilt offset values corresponding to different positions of an optical disc for a first tilt control mode, and deciding whether to switch to a static t... | 07/13/2010 |
| 7729220 | System and method for adjusting tilt angle of light beam A method for adjusting a tilt angle of a light beam emitted by an optical pickup unit of an optical disc drive, the method includes steps of adjusting the tilt angle of the light beam according to test parameters preinstalled in the optical disc drive; detecting foc... | 06/01/2010 |
| 7719940 | Tilt correcting apparatus and method, information recording apparatus, and information recording/reproducing apparatus A tilt correcting apparatus makes a tilt correction in an information recording apparatus or the like capable of recording record information onto an information recording medium, on an information recording surface of which a track having a wobble is formed, by emi... | 05/18/2010 |
| 7693018 | Optical disk recording and reproducing device A system controller of an optical disk recording and reproducing device writes test data in a test writable area of a loaded optical disk if it is an unused disk and calculates a maximum amplitude value of an RF signal at an inner radius. Then, it calculates the max... | 04/06/2010 |
| 7672209 | Hologram recording/reproducing apparatus, hologram reproducing apparatus and method, and computer program An example hologram recording/reproduction device reproduces recorded information from a holographic recording medium where interference fringes formed by a reference light and an object light corresponding to the recording information are recorded. The example holo... | 03/02/2010 |
| 7660220 | Optical disc drive apparatus and signal recording method An optical disc drive apparatus includes: a laser beam source; a collector device disposed as facing a disc that can record a signal, which collects a laser beam emitted from the laser beam source onto the disc; a record processing module which records the signal on... | 02/09/2010 |
| 7643392 | 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... | 01/05/2010 |
| 7643391 | Optical head, optical-information medium driving device, and sensor When the tilt of an optical disk is detected using a light source of an optical head, the optical head cannot be simplified enough and an optical-disk tilt cannot be detected adequately. The optical head includes: an LED chip; a light-converging element that converg... | 01/05/2010 |
| 7639583 | Optical disk device An optical disk device that has a tilt correction unit for performing tilt correction to incline the optical axis of laser light based on a tilt between the recording layer of an optical disk and the optical axis of said laser light. The tilt is detected when the op... | 12/29/2009 |
| 7626906 | Tilt control method and apparatus for optical disc recording and playback apparatus An offset adjustment signal is recorded in a test recording area provided on the inner side of a disc while modifying the level of a driving signal for offset detection that is supplied to a tilt adjustment coil. Thereafter, an operation to play back the offset adju... | 12/01/2009 |
| 7613090 | Apparatus and method for controlling tilt in optical disc device Embodiments of a method and apparatus for controlling tilt in an optical disc device such as a DVD recorder can select dynamic tilt control mode if the current operating mode of the device is record mode, and select static tilt control mode if the current operating ... | 11/03/2009 |
| 7577070 | Optical recording medium tilt compensation device, tilt compensation method, and optical information recording apparatus An optical recording medium tilt compensation device having a tilt compensation unit is disclosed that is able to compensate for a tilt error in servo control when recording or reproducing data in an optical recording medium. The optical recording medium tilt compen... | 08/18/2009 |
| 7577069 | Tilt control method and apparatus for optical disc recording and playback apparatus An offset adjustment signal is recorded in a test recording area provided on the inner side of a disc while modifying the level of a driving signal for offset detection that is supplied to a tilt adjustment coil. Thereafter, an operation to play back the offset adju... | 08/18/2009 |
| 7577071 | Tilt amount detector, tilt corrector, and optical disc apparatus A tilt amount detector includes inputting means for inputting a reproduction signal supplied from an optical disc, a first filter portion and a second filter portion for correcting an optical transfer characteristic of the reproduction signal, a reference clock extr... | 08/18/2009 |
| 7564753 | Optical pickup An optical pickup includes a lens holder body having a first surface and a second surface opposing to each other, tracking coils, a focusing coil, and tilt coils which are formed on a pair of flat panels respectively disposed on the first and second surfaces, and fi... | 07/21/2009 |
| 7518965 | Reduced thickness optical pickup device with contact avoiding part for avoiding contact between opening-regulating filter and turning mirror An optical pickup device comprising: a tilting mechanism for tilting an objective lens in accordance with tilt of an optical information disc disposed above the objective lens; a wavelength-selecting opening-regulating filter disposed immediately below the objective... | 04/14/2009 |
| 7492684 | Method and apparatus for controlling a tilt between an optical axis of an optical pick-up head and an optical disc A method and apparatus for controlling the tilt between the optical axis of an optical pick-up head and an optical disc applied in an optical disc drive is provided. A trapezoidal-wave signal in a radio frequency signal is received, wherein the trapezoidal-wave sign... | 02/17/2009 |
| 7457217 | Method and device for measuring the tilt of an optical disc A method and device for measuring the tilt in an optical disc drive (1) is disclosed. The optical disc drive (1) comprises two lasers (31, 41) generating two laser beams (32, 42) having mutually different optical characteristics. One of t... | 11/25/2008 |
| 7457218 | Data reproducing method using tilt adjustment and data reproducing apparatus for the same In a method of obtaining a reproduction signal with good quality from a data recording medium, two actual signals are generated as first and second signals I1 and I2 from detection signals obtained from the data recording medium. A coefficient ... | 11/25/2008 |
