| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 369440230 | Structure for shaping beam or causing astigmatic condition | 68 |
| 20080232203 | Optical Pickup - An optical pickup projects laser beams having the first to the third wavelengths, in response to the type of a recording medium which is an object to which recording or reproduction is to be performed, and reflecting light from the recording medium is received by a light-detecting element. In order to reduce the sizes of the optical pickup, light of the second and the third wavelengths is generated by a single dual-wavelength light source, and reflecting light of all the wavelengths is to be received by the single light-detecting element. A hologram element giving different optical effects to light of each wavelength is arranged between the light irradiating means and the light-detecting element. Thus, appropriate information recording and reproduction can be performed by using light of each wavelength. | 09-25-2008 |
| 20080232204 | OPTICAL DISK APPARATUS AND OPTICAL PICKUP DEVICE - A temperature sensor is disposed in an optical pickup to detect a temperature of an objective lens. An optical element (for example, a collimator lens) is driven according to a temperature change of the objective lens, which corrects deterioration of an optical characteristic of a laser beam passing through the objective lens. Good recording/reproduction is smoothly performed even if the optical characteristic of the objective lens is changed with the temperature change. | 09-25-2008 |
| 20080239890 | OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS - A photodetector detects returning light that returns from a bottom surface of a solid immersion lens (SIL) for detecting a gap and a tilt between an optical recording medium and the SIL. The photodetector has a first section and a second section along a direction in which the returning light is moved in the photodetector, when the SIL is driven in a tracking direction with respect to the optical recording medium. An area of the returning light in the first section and an area of the returning light in the second section are constant, even when the SIL is driven in the tracking direction. | 10-02-2008 |
| 20080267021 | Recording method, optical disk, reproduction method, and recording/reproduction device - A wide test region is ensured in an optical disk and the number of repeated recording instances is suppressed so that the optical disk is made insusceptible to damage and the test region can effectively be utilized. In an optical disk which includes a plurality of recording layers each having a power adjustment region for performing adjustment of power of a beam emitted while the data is recorded and in which the data can be rewritten in each recording layer, when, in performing the adjustment of power while the data is recorded, a region between a first power adjustment region that is a power adjustment region in a first recording layer and a second power adjustment region that is a power adjustment region in a second recording layer provided at a position that is more apart than that of the first recording layer from a plane from which the light beam enters becomes smaller, along a radial direction of the optical disk, than a predetermined size, a utilized region, in one of the first power adjustment region and the second power adjustment region, which is larger than that in the other is erased. | 10-30-2008 |
| 20080267022 | Method and System With Focus Control for Scanning an Information Carrier - The invention relates to a method and system for reading data on a data layer ( | 10-30-2008 |
| 20080279057 | ASSEMBLING METHOD FOR OPTICAL SYSTEM OF OPTICAL PICK-UP - There is provided an assembling method for expanding a maximum admissible astigmatism of objective lens which includes defining a maximum admissible astigmatism for the entire optical system, installing the collimator lens on the optical system to cause a predetermined amount of astigmatism lying within a range of up to the maximum admissible astigmatism by tilting the collimator lens from a condition where a point source of the semiconductor laser lies on an optical axis of the collimator lens, and installing the objective lens on the body case of the optical system to bring a total amount of astigmatism of the entire optical system to a level smaller than or equal to the maximum admissible astigmatism for the entire optical system by rotating the objective lens from a condition where the point source of the semiconductor laser and the center of the collimator lens lie on the optical axis of the objective lens. | 11-13-2008 |
| 20080285395 | BEAM APPLYING METHOD, OPTICAL RECORDING MEDIUM, AND RECORDING AND REPRODUCING APPARATUS - In a beam applying method, recording and reproducing operations are performed on an optical recording medium, in which a signal is recorded and reproduced by applying a beam thereto and which has a recording layer on which the signal is recorded, a quarter-wavelength plate formed below the recording layer, a polarizing plate formed further below the quarter-wavelength plate, and a reflecting film formed below the quarter-wavelength plate. The beam applying method includes the steps of; emitting a beam to be applied to the optical recording medium; and driving a quarter-wavelength plate inserted into an optical system serving to guide the emitted beam to the optical recording medium so that the optical axis direction thereof has a predetermined angle difference at the time of performing a recording operation and reproduction. | 11-20-2008 |
| 20080304375 | OPTICAL DISC APPARATUS AND OFFSET ADJUSTMENT METHOD THEREOF - An optical disc apparatus includes a laser diode for emitting a laser light, a beam splitter for dividing the laser light into a main beam and sub beam, a main photodetector for detecting the main beam to output a main push-pull signal, a sub photodetector for detecting the sub beam to output a sub push-pull signal, and a subtracter for calculating the main and sub push-pull signals to output a differential push-pull signal, in which an amplification degree of the sub push-pull signal is adjusted so that a DC offset on the differential push-pull signal is adjusted, even in the case where a laser intensity is varied. | 12-11-2008 |
| 20080316878 | METHOD FOR MEASURING THICKNESS AND MEASURING DEVICE USING THE SAME - A method for measuring thickness of a transparent layer and a measuring device using the same are provided. The transparent layer has a first face, a second face and a normal direction. The method includes the following steps. First, a light beam with a focal point is emitted to the transparent layer. Next, a focus error signal (FES) is generated according to a refracted beam of the light beam. Then, the focal point is moved along the normal direction and passes through the first face and the second face. The FES converts into a first focus error curve and a second focus error curve respectively when the focal point passes through the first and the second face. Afterwards, the thickness of the transparent layer is obtained according to the first focus error curve and the second focus error curve. | 12-25-2008 |
| 20090010113 | Optical pickup and optical pickup aberration correcting method - An optical pickup includes: a spherical aberration correcting portion for correcting spherical aberration by adjusting a convergence/divergence state of laser light emitted from a light source; a reflecting portion having: a first surface that chooses whether or not to pass laser light emitted from the spherical aberration correcting portion according to the wavelength of the laser light; and a second surface that reflects laser light that has passed through the first surface; and two objective lenses that are selectively used according to whether laser light reflected from the reflecting portion has been reflected by the first surface or by the second surface so as to condense light reflected from the reflecting portion onto a recording layer of an optical disc. Here, between the spherical aberration correcting portion and the objective lenses, there is disposed an astigmatism correcting portion that is formed such that the amount of correction can be changed. | 01-08-2009 |
| 20090016179 | NEAR-FIELD OPTICAL DISK APPARATUS AND FOCUS PULL-IN METHOD - A near-field optical disk apparatus, which can perform stable focus pull-in even when overshoot occurs, and a focus pull-in method, of which the method includes: raising an actuator, and monitoring and determining whether light focused on a disk is near-field light; holding or storing a driving voltage of the actuator if the light focused on the disk is the near-field light; raising the actuator, and determining a maximum driving voltage of the actuator; and performing focus pull-in while lowering the actuator in an interval where a driving voltage of the actuator is between the maximum driving voltage and the held or stored driving voltage. | 01-15-2009 |
| 20090059742 | OPTICAL DISK DRIVE WITH SPHERICAL ABERRATION MEASUREMENT AND METHOD OF MEASURING SPHERICAL ABERRATION IN AN OPTICAL DISK DRIVE - The invention relates to an optical disk drive. The optical disk drive has an objective lens to be driven by a focus actuator with a focus offset for focusing an incident beam onto an optical disk into a spot with a spherical aberration, and a processor to derive a first and a second characteristic from a sensor output signal and obtain a spherical aberration correction value (SA) from a pre-determined function, the pre-determined function defining a spherical aberration correction value in dependence on a focus offset difference value (ΔFO). The focus offset difference value (ΔFO) is determined from a difference between a second optimal focus offset at which the second characteristic is optimal and a first optimal focus offset at which the first characteristic is optimal. The spherical aberration correction value (SA) can be used to achieve a correction to the spherical aberration of the spot. | 03-05-2009 |
| 20090067299 | Focus controlling method and optical disk drive using the focus controlling method - An apparatus and method control a disk drive servo, and more particularly, an apparatus and method control a servo when moving between layers of a disk in a multi-layered disk drive. A focus controlling method, as an example of the servo controlling method, includes the operations of performing aberration correction according to a change of a recording layer of a disk from a currently accessed recording layer to a recording layer desired to be accessed, and changing the value of a parameter set that determines characteristics of signals for use in servo control of an optical disk drive, according to an aberration correction amount that is used during the aberration correction. | 03-12-2009 |
| 20090073824 | Optical Disc Drive - An optical disk apparatus according to the present invention includes: a light emission section for emitting laser light; an optical system for irradiating the optical disk medium with the laser light; and an aberration control section for controlling aberration of the laser light. In one embodiment, the aberration control section repeatedly switches between a plurality of aberration setting states in a focus lock-in operation. In another embodiment, the aberration control section simultaneously sets a plurality of aberration setting states in a focus lock-in operation. As a result, a plurality of aberration setting states can be allowed to substantially coexist within a single optical system. | 03-19-2009 |
| 20090073825 | Optical pick-up, aberration correcting method, optical pickup program, information recording device and method, information recording program, information reproducing device and method, information reproducing program, and information recording medium - The invention is to provide an optical pickup capable of performing a track search operation accurately by reducing noise occurring in a focus servo system during the track search operation and also accurately recording/reproducing information to/from an optical disk. | 03-19-2009 |
| 20090080298 | OPTICAL HEAD, OPTICAL HEAD MANUFACTURING METHOD AND OPTICAL DISC DEVICE - It is aimed to provide an optical head, an optical head manufacturing method and an optical disc device capable of correcting coma aberration generated due to different positions of emission points of a plurality of laser lights having different wavelengths. | 03-26-2009 |
| 20090086591 | OPTICAL DISC APPARATUS AND DETERMINATION METHOD OF OPTIMUM FOCUS POSITION - An optical disc apparatus includes: a light irradiation unit irradiating light to an optical disc to record and reproduce data; a focus position adjustment unit adjusting a focus position of the light irradiated from the light irradiation unit to the optical disc; a measurement unit measuring a correspondence relation between a light amount at a recording time of data to the optical disc at a predetermined focus position and a recording quality by controlling the irradiation unit; and a determination unit determining an optimum focus position based on a result of the measurement. | 04-02-2009 |
| 20090092009 | Runout detection method - A method for determining runout disc is disclosed. The method comprises: focusing on a focal point on a disc; driving the disc to spin the disc; generating a crossover signal according to a track of the disc crossing the focal point; and determining that the disc is a runout disc when the frequency of the crossover signal exceeds a pre-determine value. | 04-09-2009 |
| 20090109808 | OPTICAL HEAD DEVICE AND INFORMATION - According to one embodiment, a laser drive circuit which supplies a drive current to a laser element which outputs light at a predetermined wavelength, and a laser control circuit which supplies a predetermined timing pulse for generation of relaxation oscillation in a laser drive current supplied to the laser drive circuit, the laser control circuit supplying a laser drive current higher than a threshold value which is supplied from the laser drive circuit to the laser element to enable laser light to be output from the laser element, the laser control circuit setting the laser drive current to a level lower than the threshold value on the basis of the timing pulse. | 04-30-2009 |
| 20090109809 | LASER DRIVE DEVICE AND INFORMATION RECORDING/REPRODUCING APPARATUS USING THE DEVICE - According to one embodiment, a laser drive circuit includes a photodetector which receives part of laser light emitted from a laser element to a recording medium independently of reflection laser light reflected by the recording medium, and outputs an output corresponding to the strength thereof, an integration circuit which integrates the output from the photodetector for a predetermined time, and a setting circuit which sets the intensity of a laser drive current supplied to the laser element on the basis of the output from the integration circuit. | 04-30-2009 |
| 20090116346 | OPTICAL RECORDING/PLAYBACK DEVICE AND MEDIUM DIFFERENTIATION METHOD - There is provided a recording/playback device able to differentiate the type of an optical disc or another such optical recording medium with a high degree of precision while correcting wavefront aberrations. The recording/playback device has a detection part for sequentially detecting the surface of a cover layer and one or a plurality of signal recording surfaces of an object to be detected on the basis of an output signal of a photodetector, a medium differentiation part for differentiating the type of the detected object on the basis of the detection results, an aberration correction element, and an aberration control part for controlling the aberration correction state of the aberration correction element. When the focal point of the light beam moves toward the signal recording surface, the aberration control part sets the aberration correction state of the aberration correction element to a state between a first aberration correction state in which the wavefront aberrations are appropriately corrected in accordance with a surface of a cover layer of a predetermined optical recording medium, and a second aberration correction state in which the wavefront aberrations are appropriately corrected in accordance with a signal recording surface of the predetermined optical recording medium. | 05-07-2009 |
| 20090122662 | Optical pickup - A spherical aberration correction mechanism includes an aberration correction lens, a movable portion for supporting the aberration correction lens, a fixing portion for supporting the aberration correction lens, in which the movable portion is disposed in a slidable manner, a shaft for supporting the movable portion in a rotatable manner about the axis and in a slidable manner in the axial direction, a feed screw having a helical groove, an engaging portion having an engaging groove like a male thread engaging with the helical groove from an direction, and a coil spring engaging with the outer surface of the shaft, for pressing the movable portion in the axial direction. Each end portion of the feed screw is provided with a cylindrical portion having an outer diameter smaller than an inner diameter of the feed screw, and a resetting elastic portion supported by the fixing portion or the movable portion is provided for pressing the movable portion in the direction opposite to the pressing direction of the coil spring. | 05-14-2009 |
| 20090129217 | OPTICAL INFORMATION RECORDING APPARATUS - A rewritable optical disk apparatus, optical information recording and reproducing apparatus or the like is allowed to automatically and properly adjust the optical system to the optimum focal condition regardless of the readout signal detector's positional error and the residual aberration in the optical system. The spherical aberration and defocus are coarsely adjusted using the amplitude (PP amplitude) of the tracking error signal and then finely adjusted using the amplitude (RF amplitude) of the readout signal. Since the spherical aberration can properly be adjusted, it is possible to raise the reliability of the readout signal. | 05-21-2009 |
| 20090135684 | Defocus Detection Device, Defocus Detection Method and Optical Disk Unit Using the Same - Defocus detection device and method capable of detecting a defocus accurately during recording of information to an optical disk having a plurality of recording layers and an optical disk unit using the device and method are provided. A temporal restriction is imposed on defocus detection and besides, in comparison with a level for detection of a first change of a focus error signal developing during a defocus, a level for detection of a successively occurring second change of a polarity inverse to that of the first change is made to be smaller. When the first level is exceeded and thereafter the second level is exceeded within a restricted time, a defocus is detected. | 05-28-2009 |
| 20090141598 | Apparatus for Adjusting Focus Offset and Method Thereof - The present invention provides an apparatus of an optical disc drive for adjusting a focus error signal. The apparatus includes a focus offset determining unit and an adjusting module. The focus offset determining unit is utilized for determining a target focus offset corresponding to a target condition, and the adjusting module is coupled to the focus offset determining unit and utilized for receiving the focus error signal and adjusting the focus error signal with the target focus offset to generate an adjusted focus error signal. | 06-04-2009 |
| 20090147631 | Optical Disk Image Forming Device, Optical Disk Image Forming Method and Optical Disk - When an image is formed on an optical disk, an optical disk image forming device reads information written in an information area of the optical disk. When a reflection preventing process is applied to an image forming area of the optical disk, the optical disk image forming device corrects at least one of a laser power or a focus gain in accordance with information about the image forming areawritten in the information area. Thus, the optical disk image forming device can form the image with a clear brightness and a good visibility on the image forming area of the optical disk without allowing a rainbow-color to appear or a face or a background to be reflected due to the interference of light. | 06-11-2009 |
| 20090168614 | SPHERICAL ABERRATION CORRECTION APPARATUS AND SPHERICAL ABERRATION CORRECTION METHOD - According to one embodiment, a spherical aberration correction apparatus includes a pickup which applies laser light to an optical disk through an objective lens, a photodetector which detects laser light incident through the objective lens as reflected light from the optical disk, a liquid crystal panel which corrects a spherical aberration of the objective lens with respect to the laser light, a flash-ROM which stores in advance an optimum relationship between a defocus position and a spherical aberration for various optical disk thicknesses, and a control module which measures a thickness of the optical disk by detection of laser light applied to and reflected from the optical disk, and controlling the liquid crystal panel to collect the spherical aberration in accordance with the defocus position of the relationship stored in the flash-ROM for the measured optical disk thickness. | 07-02-2009 |
| 20090231965 | Method for setting spherical aberration correction and device using the method - A method for setting the spherical aberration correction of a scanning beam in a device for scanning an information layer of an optical record carrier. The method comprises the following steps: converging the scanning beam ( | 09-17-2009 |
| 20090238048 | METHOD AND APPARATUS FOR COMPENSATING ASTIGMATISM IN AN OPTICAL STORAGE SYSTEM - The present invention discloses a method and an apparatus for compensating astigmatism in an optical storage system. Firstly, the optical storage system focuses on an optical disc and proceeds track seeking. While track seeking, the astigmatism compensator continues adjusting and an astigmatism index signal is also measured. At last, an optimal astigmatism compensated value of the astigmatism compensator is acquired based on the measured result of the astigmatism index signal. | 09-24-2009 |
| 20090274020 | OPTICAL HEAD UNIT AND OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS - An optical head unit is configured as an optical head unit corresponding to an optical recording medium of BD standard, and an optical recording medium of HD DVD standard. A magnification-variable lens includes convex lens, concave lens, and convex lens. The magnification-variable lens allows each lens to be movable along the optical axis direction, and has the function of changing the ratio of diameter of light incident from the convex lens to the diameter of light that exits from the convex lens within a specific ratio. The magnification-variable lens emits light having a diameter corresponding to the numerical aperture, 0.85, of the objective lens towards the objective lens upon recording/reproducing on a disk of BD standard, and emits light having a diameter corresponding to the numerical aperture, 0.65, of the objective lens upon recording/reproducing on a disk of HD DVD standard. | 11-05-2009 |
| 20090285059 | APPARATUS FOR INITIALIZING AND METHOD OF MANUFACTURING OPTICAL DISC, AND INITIALIZATION REFERENCE PLATE - An embodiment of the present invention includes rotating an integrated disc formed by temporarily fixing an initialization reference plate to an uninitialized optical disc that is an optical disc to be irradiated with a light beam of light having a predetermined or higher intensity to record information as a recording mark. The initialization reference plate has a reference part that reflects at least a part of a servo light beam of servo light intended for servo control. The reference part contains information that indicates the position of a track of the optical disc for the recording mark to be formed on, in the form of a track of pit-and-projection pattern. | 11-19-2009 |
| 20090290456 | OPTICAL DISC DEVICE, METHOD FOR ACTIVATING OPTICAL DISC DEVICE, AND CONTROL CIRCUIT - An optical disc device includes: a light source; a condensing system including a solid immersion lens for emitting light from the light source onto an optical disc; a gap control circuit for setting a distance between the solid immersion lens and the optical disc to a constant value; a CPU for adjusting a condensing position of emission light from the solid immersion lens with respect to an information recording/reproducing surface of the optical disc by moving a concave lens in a direction of an optical axis; and a focus control circuit for setting the condensing position on the information recording/reproducing surface, while following plane displacement of the information recording/reproducing surface, using a focus error signal. The CPU is operable to correct coma aberration in focus position adjustment by moving the concave lens in a direction perpendicularly intersecting with the optical axis. | 11-26-2009 |
| 20090323480 | OPTICAL STORAGE SYSTEM AND SPHERICAL ABERRATION COMPENSATION APPARATUS AND METHOD THEREOF - An optical storage system and a spherical aberration (SA) compensation apparatus and method thereof are provided. The SA compensation apparatus includes a microprocessor and a digital-signal-processor (DSP). The microprocessor regulates a compensation value of an SA compensation driver in the optical-pickup-head (OPH) several times after the microprocessor has determined the type of an optical storage medium and before the OPH has not focused on the optical storage medium. The DSP processes a plurality of electrical signals converted through the OPH whenever the microprocessor has regulated the compensation value of the SA compensation driver, so as to obtain width values of a plurality of focus-error (FE) signals. Accordingly, the microprocessor makes the SA compensation driver to drive an SA compensation unit according to the width values of the FE signals, so as to compensate an SA of the light point generated by the OPH and focused on the optical storage medium. | 12-31-2009 |
| 20090323481 | DRIVE APPARATUS AND TRACK JUMP METHOD - A drive apparatus includes a light irradiation section for applying light from a light source via an object lens on a hologram recording medium having a recording layer on which a hologram is formed and a track formation layer on which an address recording track composed of a pit string recording address information representing the hologram recording position on the recording layer and an auxiliary track composed of a continuous groove formed side by side with the address recording track are formed, a light spot displacement section for displacing a light spot formed by the light irradiation section in a radius direction of the hologram recording medium, and a control section for controlling the light spot displacement section following a light information signal upon the auxiliary track traverse of the light spot obtained in accordance with the light spot displacement to execute a jump operation between the address recording tracks. | 12-31-2009 |
| 20090323482 | ABERRATION CORRECTION ELEMENT - An aberration correction element including a diffraction plane that corrects a spherical aberration caused by the difference among a first optical recording medium, a second optical recording medium, and a third recording medium by transmitting first beams of light having a wavelength of λ | 12-31-2009 |
| 20100027384 | OPTICAL HEAD DEVICE, OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE AND ERROR SIGNAL GENERATION METHOD - A diffractive optical element generates main and two sub beams from an output light of a light source. An objective lens focuses the main and two sub beams on an optical recording medium. An optical detector receives the main and two sub beams reflected by the optical recording medium. The diffractive optical element is divided into six regions having different optical characteristics by a tangential direction division line corresponding to the tangential direction of the optical recording medium, first and second radial direction division lines corresponding to the radial direction thereof. A light in the first sub beam passing an intersection of the first radial and tangential direction division lines passes a region near the center of the objective lens. A light in the second sub beam passing an intersection of the second radial and the tangential direction division lines passes a region near the center of the objective lens. | 02-04-2010 |
| 20100061202 | OPTICAL PICKUP DEVICE AND OPTICAL DISC APPARATUS - In the optical pickup device, while reflection light reflected from the optical multi-layer disc is divided into a plurality of regions so as to produce a plurality of divided optical beams, the divided optical beams are focused onto different positions on a photodetector, and a focus error signal is detected by employing a plurality of the divided optical beams by utilizing the knife edge method, and further, a tracking error signal is detected by employing a plurality of the divided optical beams. Furthermore, the dividing regions of the optical beam and light receiving parts are arranged in such a manner that stray light derived from other layers of the optical disc is not entered to a servo signal-purpose light receiving part of the photodetector when the divided optical beam is focused onto a target layer of the optical disc. | 03-11-2010 |
| 20100061203 | METHOD AND APPARATUS FOR RECORDING AND/OR REPRODUCING DATA INTO AND/OR FROM OPTICAL DISK - Provided are a method and apparatus for recording and/or reproducing data into and/or from an optical disk. The apparatus includes a reference beam optical system to form a focus of a reference beam in an optical data storage layer of the optical disk and including an objective lens; a signal beam optical system to form a focus of a signal beam in the optical data storage layer and also including the objective lens; and a servo optical system to project a servo beam onto the optical disk, receiving a reflection servo beam which is reflected on the optical disk, and performing focusing and tracking control on the objective lens. The reference beam optical system includes a first focus mover to move the focus of the reference beam, and the signal beam optical system includes a second focus mover to move the focus of the signal beam. The data is recorded into a plurality of recording layers in the optical data storage layer by moving a first focus position, at which the foci of the reference beam and the signal beam are located, in a thickness direction of the optical data storage layer, which is a focusing direction. | 03-11-2010 |
| 20100110846 | METHOD AND APPARATUS FOR CONTROLLING POSITION IN WHICH DATA IS TO BE RECORDED - A method and apparatus to control a position in which data is to be recorded on a holographic data recording medium by using interference between a reference light and a signal light, the method including: irradiating the reference light and the signal light on the holographic data recording medium; generating a focus error signal that indicates a distance difference between a first focus corresponding to a focus of the reference light on the holographic data recording medium and a second focus corresponding to a focus of the signal light on the holographic data recording medium, based on information about a reflective signal light generated when the irradiated signal light is reflected from a reflective transmission layer of the holographic data recording medium; and moving the second focus to a position of the first focus, based on the focus error signal. | 05-06-2010 |
| 20100177606 | METHOD FOR IDENTIFING A LAYER NUMBER OF AN OPTICAL DISC - A method for identifying a layer number of an optical disc is provided. Firstly, a SA value is adjusted to a standard SA value of each of two data layers in sequence. Next, focusing courses are performed so as to enable the focus point to pass through the optical disc. Then, maximum amplitudes of focusing error signals in the focusing courses are recorded. After that, whether the maximum amplitudes of the focusing error signals recorded in the focusing courses are equal is checked. If the maximum amplitudes are equal, the optical disc is identified as a double-layered disc. If the maximum amplitudes are not equal, the optical disc is identified as a single-layered disc. | 07-15-2010 |
| 20100195455 | OPTICAL DISC APPARATUS, FOCUS ERROR SIGNAL ADJUSTMENT METHOD, PROGRAM, AND INTEGRATED CIRCUIT - To adjust the symmetry of a focus error signal, the symmetry of the focus error signal needs to be measured during upward and downward driving of an objective lens, which is performed at every varying setting of a signal correction gain value of the focus error signal, and such adjustment takes a long time. An optical disc device ( | 08-05-2010 |
| 20100296374 | APPARATUS AND METHOD FOR INITIALIZING INFORMATION RECORDING MEDIUM, APPARATUS AND METHOD FOR RECORDING INFORMATION, AND INFORMATION RECORDING MEDIUM - An initialization apparatus that has a simplified configuration and that forms an initial hologram in an information recording medium is provided. An initialization apparatus ( | 11-25-2010 |
| 20110051574 | OPTICAL PICKUP DEVICE AND OPTICAL DISK DEVICE USING THE SAME - Of the beams reflected by an optical disk, only peripheral beams excluding the push-pull region are used to generate a DPD signal in order to optimize internal wire connections among the light receiving areas of the optical detector and thereby reduce the amplification factor of the lens error signal, required for generating the tracking error signal of the DPP method. A beam reflected from a multilayered optical disk is divided into some beam diffraction areas. The divided beam diffraction areas and the light receiving areas are so arranged that the divided beams focus at different positions on the optical detector and that, when a beam is focused on a target recording layer of the disk, stray light from other than the target recording layer being reproduced does not enter into the servo signal light receiving area of the optical detector. | 03-03-2011 |
| 20110096646 | Reproducing System for Use With Optical Devices - A reproducing system reproduces data recorded on an optical record carrier. The system includes a light source driver unit that modulates and controls a light output by a light source, such as a laser, in order to read data from an optical record carrier. The system is configured to operate in two modes: a reading mode and a light source lifetime extension mode. During the reading mode, the light source generates a continuous light output while data is read from the optical record carrier. During the light source lifetime extension mode, the light source generates a pulsed light output which may provide continued tracking and focus of the light on the optical record carrier, even when no data is being read from it. | 04-28-2011 |
| 20110110204 | VARIABLE MIRROR ACTUATOR AND OPTICAL DISC DRIVE - A pickup and a drive, in a small size, having a spherical aberration correction device capable of correcting various spherical aberration, and coma aberration and/or astigmatism with a low power consumption. A variable-focus lens actuator can correct spherical aberration such that a transparent deformation film warps into a parabolic shape when a magnetic field is applied thereto, thereby changing the light intensity distribution of transmitted light. Further, the variable-focus lens actuator can correct coma aberration and/or astigmatism by arbitrarily tilting the transparent film to change the proceeding direction of the transmitted light. | 05-12-2011 |
| 20110134731 | OPTICAL DISC APPARATUS AND DEFOCUS CORRECTING METHOD - An optical disc apparatus in which a bias of a focusing error signal is changed to a value according to a recording power at timing corresponding to a predetermined address position before starting the recording and a defocus of an opposite polarity is preliminarily caused so as to set off a defocus which occurs at the start of the recording. | 06-09-2011 |
| 20110182159 | OPTICAL PICKUP - An optical pickup includes a light source, an objective lens, a diffraction grating that divides an optical beam reflected from a predetermined information layer, into a plurality of optical beams, and a detector having a plurality of photo-receivers to receive a plurality of optical beams. The diffraction grating has a predetermined region for dividing from a signal light beam a region including a central portion of a spot which the signal light beam will form on the diffraction grating. A distance from a central section of the detector to that of a spot center photo-receiver on the detector, the spot center photo-receiver being provided to receive the optical beams formed by division in a predetermined region of the diffraction grating, is equal to or greater than a spot radius of the unwanted light beams entering the predetermined region of the diffraction grating, on the detector. | 07-28-2011 |
| 20110211429 | OPTICAL PICKUP DEVICE AND OPTICAL DISC DEVICE - An optical pickup device includes a plurality of laser light sources emitting laser beams of different oscillation wavelengths, and a plurality of objective lenses on which the laser beams in the form of diverging beams emitted by the plurality of laser light sources are incident, and which directly focus the laser beams onto a recording surface of an optical disc. A rising mirror reflects a laser beam in the form of a diverging beam emitted by a laser light source of a predetermined oscillation wavelength among the plurality of laser light sources so as to lead the laser beam to one of the plurality of objective lenses, and transmits the laser beam in the form of a diverging beam emitted by the other laser light source. As the rising mirror transmits the laser beam in the form of the diverging beam emitted by said other laser light source, astigmatism is generated so as to correct existing astigmatism of the laser beam emitted by said other laser light source. | 09-01-2011 |
| 20110292776 | OPTICAL DISC APPARATUS AND OPTICAL DISC DISCRIMINATING METHOD - In an optical disk having multiple layers for which a correction of spherical aberration is required, a spherical aberration correcting element is set to a predetermined spherical aberration correction amount; a laser light source is turned ON; an objective lens is swept; when it is discriminated that the optical disk has two or more layers, or has more than two information recording planes, the spherical aberration correction amount is changed into a spherical aberration correction amount suitable for information recording planes of three, or more layers; and the objective lens is again swept so as to discriminate a total layer number thereof. | 12-01-2011 |
| 20120057441 | SPHERICAL ABERRATION CORRECTION APPROPRIATE POSITION SEARCH APPARATUS, AND SPHERICAL ABERRATION CORRECTION APPROPRIATE POSITION SEARCH METHOD - A focus error amplitude obtaining device is configured to obtain amplitudes of a focus error signal. An error amplitude difference calculation device is configured to calculate an error amplitude difference which is a difference between the amplitudes of the focus error signal obtained at two different positions in a moving range of a spherical aberration correction device. An appropriate position search control device is in charge of overall control of structural elements; spherical aberration correction device movement control device, focus error amplitude obtaining device, and error amplitude difference calculation device. The appropriate position search control device decides an appropriate position of the spherical aberration correction device based on the error amplitude difference. | 03-08-2012 |
| 20120075971 | METHOD FOR DETERMINING TYPE OF OPTICAL DISK AND OPTICAL STORAGE DEVICE - A method for determining a type of an optical disk includes following steps. A laser beam of a first type is focused on a disk to generate a first optical reflection signal. A first spherical aberration estimate is generated according to the degree of dispersion and strength of the first optical reflection signal. A laser beam of a second type is focused on the disk to generate a second optical reflection signal. A second spherical aberration estimate is generated according to the degree of dispersion and strength of the second optical reflection signal. The type of the disk is determined based on the first spherical aberration estimate and the second spherical aberration estimate. | 03-29-2012 |
| 20120106306 | INTEGRATED CIRCUIT AND OPTICAL DISC APPARATUS - An integrated circuit is provided in an optical disc apparatus for drawing a visible image on an optical disc including a discoloration layer which is discolored by heat or light by irradiating the optical disc with laser light. The integrated circuit includes a tracking direction displacement section configured to execute, when the visible image is drawn, oscillation control to oscillate a position irradiated with the laser light in a radial direction of the optical disc, and a laser modulation section configured to change, when the visible image is drawn, an intensity of the laser light so that the higher a displacement rate of the position irradiated with the laser light in the radiation direction is, the higher the intensity of the laser light becomes. | 05-03-2012 |
| 20120106307 | OPTICAL DISC APPARATUS AND DEFOCUS CORRECTING METHOD - An optical disc apparatus in which a bias of a focusing error signal is changed to a value according to a recording power at timing corresponding to a predetermined address position before starting the recording and a defocus of an opposite polarity is preliminarily caused so as to set off a defocus which occurs at the start of the recording. | 05-03-2012 |
| 20120134251 | SYSTEM AND METHOD FOR PRECISE SERVOING - A method for servoing when reading out a recorded holographic disk or recording in a preformatted holographic disk is disclosed. The method includes detecting a primary signal of a reflected primary beam from a target data track of a target data layer of the holographic disk, wherein the primary beam of radiation has a first wavelength. The method also includes comparing a power measurement of the primary signal with a threshold value of power. The method also includes detecting a tracking signal of a reflected tracking beam from a reference layer of the holographic disk in an event that the power measurement of the primary signal is below the threshold value of power, wherein the tracking beam of radiation has a second wavelength. The method also includes generating a servo error signal based upon the primary signal or the tracking signal. The method further includes actuating an optical sub-system based upon either of the primary servo error signal or the tracking servo error signal such that the primary beam focuses on the target data layer. | 05-31-2012 |
| 20120182847 | OBJECTIVE LENS AND OPTICAL PICK-UP DEVICE USING THE SAME - Provided is an objective lens that allows securing of a long working distance for a laser beam with a long wavelength and has a predetermined thickness or larger, and an optical pickup apparatus including the objective lens. In an objective lens of the present invention, a first region that focuses laser beams of a BD, DVD, and CD standards, a second region that focuses the laser beams of the DVD and CD standards, and a third region that focuses the laser beams of the BD and the DVD standards are provided in this order from a center portion of the objective lens. An optical super resolution with the laser beam of the BD standard is achieved by preventing a portion of the laser beam of the BD standard transmitted through the second region from contributing to spot formation. | 07-19-2012 |
| 20120218874 | OPTICAL HEAD - An optical head capable of recording or playing back optical discs is provided. The optical disc comprises a light source to emit a beam, an objective to focus the beam on an optical disc, a beam dividing element having a plurality of divided areas with which to divide a cross section of the beam reflected from the optical disc, and a light detector to receive the beams divided by the beam dividing element, wherein the beam dividing element has in at least one of the plurality of areas an aberration imparting function of imparting an astigmatism or defocus aberration to a beam passing through that area. | 08-30-2012 |
| 20120236695 | OPTICAL DISK DEVICE AND DRIVING METHOD THEREOF - The optical disk device can stably control an aberration correction lens even when one end of a movable range of the aberration correction lens is set as a reference position. The optical disk device comprises an optical pickup unit including the aberration correction lens and a stepping motor for moving the aberration correction lens, wherein, when an optical disk is inserted into the optical disk device, the aberration correction lens is moved to the reference position within the movable range and near one end thereof, and wherein, when moving the aberration correction lens to the reference position, driving pulses are applied to the stepping motor to press the aberration correction lens against the one end of the movable range, and thereafter a predetermined number of pulses are applied to reversely rotate the stepping motor and to set a stop position where the aberration correction lens stops as the reference position. | 09-20-2012 |
| 20120236696 | FOCUS SERVO CONTROL DEVICE, AND INFORMATION RECORDING/REPRODUCING DEVICE USING THE SAME - A focus servo control device includes a first detector, first controller, second detector, and second controller. The first detector detects a first focus error signal. The first controller controls the objective lens based on the first focus error signal, so that a focal point of the first laser agrees with the guide layer. The second detector detects a second focus error signal. The second controller changes a relative distance between the focal point of the second laser and the focal point of the first laser, so that the focal point of the second laser agrees with a target recording/reproducing layer. | 09-20-2012 |
| 20120287765 | OPTICAL HEAD AND OPTICAL DRIVE DEVICE - The present invention provides a unit and method for implementing an optical head and optical drive device whose configuration is simple, and which allows the generation of a track error signal in which no offset is caused to occur. The optical drive device includes a light source for emitting light beams, an objective lens for converging the light beams onto an optical disc, an optical-signal generation element for dividing the light beams into at least four regions by using a division line extending in the radial direction of the optical disc, and a division line extending in the track direction of the optical disc, the light beams being reflected by the optical disc, and an optical detector for receiving the light beams divided by the optical-signal generation element, wherein the up and down or right and left areas of the four regions are made different from each other. | 11-15-2012 |
| 20120314550 | OPTICAL DISK DEVICE - An optical disk device is configured such that when an optical disk including three or more recording layers on one side is inserted into the optical disk device, a movable lens position adjustment device performs adjustment using as an index a tracking error signal provided with a limit to an amount of movement of a movable lens for spherical aberration correction at start-up of the optical disk device and sets an upper limit to the number of retries of the adjustment at the recording layer farthest away from the side on which the laser beam is incident to 1 or more. | 12-13-2012 |
| 20120314551 | OPTICAL DISC APPARATUS - Before tracking control is turned on, there is determined a correction formula for correcting a balance value of a tracking error signal depending on a position of a movable lens for spherical aberration correction. Then, after the tracking control has been turned on, using an RF signal as an index, the adjustment of the position of the movable lens for spherical aberration correction is performed, while the balance value of the tracking error signal is corrected by use of the correction formula. An adjustment value for adjusting the balance value of the tracking error signal at a time point of completing the adjustment of the position of the movable lens for spherical aberration correction is stored. | 12-13-2012 |
| 20130003512 | OPTICAL PICKUP DEVICE AND OPTICAL DISC APPARATUS EQUIPPED WITH THE SAME - An optical pickup device includes a light source for emitting a light beam, an objective lens for collecting the light beam which is emitted and for irradiating an optical disc with the collected light beam, a diffraction element with a plurality of areas for dividing the light beam which is reflected from the optical disc, a detector with a plurality of detection parts for receiving the light beam which is made to diverge by the diffraction element, and a branching mirror for making the light beam branch into an optical path from the light source to the objective lens and an optical path from the objective lens to the detector. The diffraction element gives an aberration to the light beam diffracted at a specified area. | 01-03-2013 |
| 20130021884 | OPTICAL DISK DRIVING APPARATUS, OPTICAL DISK DRIVING SYSTEM, VEHICLE EQUIPPED WITH OPTICAL DISK DRIVING SYSTEM, METHOD OF CORRECTING SPHERICAL ABERRATION IN OPTICAL DISK DRIVING APPARATUS, PROGRAM AND RECORDING MEDIUM - An optical disk driving apparatus includes an optical head device having a laser light source, a converging optical system converging a light beam emitted by the laser light source onto an optical disk, a photo detector receiving reflected light reflected by the optical disk, and an aberration correcting optical system controlling aberration of the converging optical system; a motor rotating the optical disk; and a control section receiving a signal from the photo detector, wherein the converging optical system has an objective lens formed using resin as a main material, the aberration correcting optical system has a spherical aberration correcting element correcting spherical aberration, and the control section evaluates quality of a reproduction signal for information in the optical disk by using the reflected light received by the photo detector, and utilizes a result of the evaluation to perform closed loop control on the spherical aberration correcting element. | 01-24-2013 |
| 20130044576 | OPTICAL RECORDING/REPRODUCTION METHOD AND OPTICAL RECORDING/REPRODUCTION DEVICE - An optical recording/reproduction method and device that can perform control for optimizing the amount of spherical aberration in a multilayered optical disc in a short period of time. When the objective lens is displaced in the focusing direction, the amplitude value of the focusing error signal detected just after leaving the focal position of a given first recording layer and the amplitude value of the focusing error signal detected just before passing through the focal position of a given second recording layer other than the first recording layer are measured with a particular spherical aberration, the amplitude ratio of amplitude values is calculated, the difference between spherical aberration and the optimal spherical aberration for the second recording layer is approximated as a function of the amplitude ratio, the optimal spherical aberration is calculated on the basis of this approximation, and the spherical aberration is set. | 02-21-2013 |
| 20130094337 | OPTICAL READ/WRITE APPARATUS AND READ APPARATUS - In one embodiment, the optical read/write apparatus includes a plurality of optical pickups arranged to cross tracks of an optical storage medium and a control section. On finding the data that has been written by any of those optical pickups inaccurate or on detecting any defect at a location where data is going to be written by any of the optical pickups, the control section instructs another one of the optical pickups to write that data on a different track from a track on which the data should have been written. | 04-18-2013 |
| 20130182547 | OPTICAL DISK DEVICE AND OPTICAL PICKUP THEREFOR - When an optical pickup used for an optical disk device is formed, the optical pickup includes a stepping motor which drives a lens used to correct for spherical aberration, and the stepping motor is mounted in such a manner that the stepping motor is exposed at a surface (upper part) where the stepping motor faces the optical disk. In addition, the stepping motor is mounted in such a manner that the stepping motor is exposed at a surface (lower part) opposite the surface where the stepping motor faces the optical disk. | 07-18-2013 |
| 20130229898 | OPTICAL PICKUP DEVICE AND OPTICAL DISC APPARATUS FOR RECORDING AND REPRODUCING INFORMATION ON AND FROM OPTICAL DISC PLURALITY OF RECORDING LAYERS - Provided is an optical pickup device that suppresses a fluctuation of a tracking error signal caused by stray light when recording/reproducing information on/from an optical disc including a plurality of recording layers and attains size reduction. It includes a laser diode emitting laser light of about 405 nm in wavelength, an objective lens irradiating the optical disc with an optical beam emitted from the laser diode and having a numerical aperture of about 0.85, and a detector including a detection part receiving the optical beam reflected from the optical disc. An optical magnification from the optical disc to the detector is set within a range from about 10× to 15×. | 09-05-2013 |
| 20140036648 | OPTICAL DISC DEVICE - Disclosed is an optical disc device that provides a stable servo signal with a simple configuration during the use of an objective lens showing significant color aberration. At time T | 02-06-2014 |
