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Dynamic Information Storage Or Retrieval > With Servo Positioning Of Transducer Assembly Over Track Combined With Information Signal Processing > Optical Servo System > Optical Head Servo System Structure > Structure For Shaping Beam Or Causing Astigmatic Condition Structure For Shaping Beam Or Causing Astigmatic ConditionStructure For Shaping Beam Or Causing Astigmatic Condition patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.01/24/08 - 20080019233 - Method for identifying recording contents of an optical disk A method for identifying an optical disk according to a radio frequency integration filtering signal includes the steps of: moving an optical head to an initial position; rotating the optical disk and making focus, moving the optical head in a direction toward an inner ring until the optical head is ... 01/17/08 - 20080013414 - Optical head for optical recorder/reproducer An optical head for recording or reproducing a signal on or from an optical recording medium comprising a light source, an objective lens for condensing light emitted from the light source to the optical recording medium, and a light-separating means arranged between the light source and the objective lens in ... 01/10/08 - 20080008060 - Light-receiving element, optical head using same, and optical recording/reproduction apparatus using same The invention relates to a light-receiving element for receiving light reflected at an optical recording medium, an optical head using the element, and an optical recording/reproduction apparatus using the element. The invention provides a light-receiving element capable of preventing deterioration of an electrical signal obtained through photoelectric conversion of received ... 12/13/07 - 20070286036 - Electron beam recording apparatus An electron beam recording apparatus provided with control means for forming a latent image in a resist layer on a disk substrate corresponding to a predetermined pattern by controlling the irradiation position of an electron beam irradiation unit on the surface of the resist layer in accordance with the rotation ... 11/22/07 - 20070268794 - Beam splitter configuration A beam splitter configuration includes at least one beam splitting system for splitting a light beam into a number of partial beams. The beam splitting system includes at least one first and at least one second optical array disposed at a distance from one another and having a number of ... 08/16/07 - 20070189131 - Optical disc device An optical disc device of the present invention includes spherical aberration changing means for changing spherical aberration occurring on a converging position of a light beam converged by a lens, an actuator for moving the spherical aberration changing means in a relatively precise manner, and an actuator for moving the ... 08/16/07 - 20070189130 - Optical information device and information recording and reproduction device Stable tracking control is achieved for an optical recording medium having a plurality of information recording planes. To achieve this, an optical information device comprises a light source for emitting a light beam, a focusing unit for converging the light beam emitted from the light source onto a predetermined information ... 08/09/07 - 20070183274 - Optical disk apparatus An optical disk apparatus for correcting astigmatism that influences the read/ write. If there is astigmatism, and auto-focus and tracking control are in operation, then a push-pull signal amplitude and a 2T signal amplitude vary with the variation of an amount of spherical aberration, resulting in two cases. In one ... 08/02/07 - 20070177469 - Optical disk drive In an optical disc drive that needs an aberration correcting element for correcting spherical aberrations, it takes long time to conduct a processing operation of the aberration correcting element in an interlayer movement of a multilayer disc and a drive initializing operation. In order to eliminate the problem, an optical ... 07/26/07 - 20070171778 - Optical recording/reproducing apparatus, optical pickup, and tracking error detecting method An optical recording/reproducing apparatus includes an optical pickup and a control section. The optical pickup includes: a detecting section; an optical system that radiates light from a light source onto an optical recording medium as near-field light by a condenser lens having a numerical aperture of 1 or more, and ... 07/12/07 - 20070159936 - Optical head unit and optical disc apparatus According to one embodiment, an optical head unit according to an embodiment of the invention, a reflected beam guided to a detection area of a photodetector is changed in the image forming characteristic by a liquid crystal element, which is placed between an object lens and a collimator lens, and ... 07/05/07 - 20070153645 - Optical pickup, optical disc device and method for manufacturing optical pickup An optical pickup is provided which is capable of minimizing an astigmatism thereof with a simple configuration. The optical pickup 6 includes a collimate lens 16 for transferring optical beams outputted from a laser diode 11 to parallel light, and an objective lens 18 for collecting the optical beams transferred ... 06/28/07 - 20070147198 - Optical pickup device and method of laying out the same An optical pickup device is provided, in which, supposing that an angle formed by the meeting of a straight line connecting a center of an optical disk and an accessing position of an HD objective lens with a diameter L of the optical disk is a track angle θ1, an ... 05/31/07 - 20070121437 - Optical information recording-reproduction apparatus The recording medium 12 is radiated with light beam from the second light source to obtain servo signal from the reflected light. At least one of the relay lenses 8 in the relay optical system is moved perpendicularly to the optical axis according to the servo signal to follow-up moving ... 05/24/07 - 20070115767 - Optical pickup device A wavefront of a laser light is adjusted using a phase correcting element. The phase correcting element includes an electrode layer, an electrode layer arranged facing the former electrode layer, orientation films arranged on a surface facing the electrode layers, and a liquid crystal layer filled between the orientation films. ... 05/17/07 - 20070109924 - Optical pickup An optical pickup includes a light source, an objective lens for condensing a light beam emitted from the light source on a disk, a hologram element for splitting the light beam reflected by the disk, a photo detector for receiving the split light beam, a holding element for holding the ... 05/10/07 - 20070104046 - Optical pickup device In order to (i) reduce astigmatism due to a diffraction grating capable of compensating light intensity distribution of a light beam emitted by a light source and (ii) simplify fabrication processes, an optical pickup device of the present invention includes: a semiconductor laser 1; a collimator lens 4; a diffraction ... 05/10/07 - 20070104045 - Optical information recording and reproducing apparatus capable of coma aberration correction Provided is an optical information recording and reproducing apparatus including a light beam expander for correcting spherical aberration caused when a plurality of recording layers of an optical disc are brought into focus by changing a divergent angle or a convergent angle of light entering an objective lens, and coma ... 05/03/07 - 20070097811 - Optical pickup and optical disc apparatus An optical system is disclosed including an optical pickup having a wavefront aberration-correcting element capable of correcting coma aberration and astigmatism, and an optical disc apparatus which uses the optical pickup. The optical pickup includes a laser light source for irradiating an optical disc with a light beam; an objective ... 05/03/07 - 20070097810 - Optical head unit and optical disc apparatus According to one embodiment, an optical head unit which is provided with a liquid crystal element to correct aberration on an information recording surface of an optical disc, to decrease the influence of inclination and variations in the thickness of an optical disc, regardless of displacement of an optical axis ... 05/03/07 - 20070097809 - Method of adjusting spherical aberration and focus offset in optical disk apparatus and optical disk apparatus using the same Provided is a simple method of adjusting spherical aberration and a focus offset. According to the adjusting method of the present invention, focus offset adjustment and spherical aberration adjustment are performed based on the fact that the dependence of a focus offset on a spherical aberration correction value (SA) is ... 04/19/07 - 20070086288 - Optical pickup apparatus equipped with optical system correcting spherical aberration, and information recording and reproduction apparatus using the same The present invention provides an optical pickup apparatus which can prevent an offset to a focus signal and can satisfactorily correct spherical aberration generated by difference in substrate thickness while achieving the formation of a thinner type of the apparatus. In the present invention, a parallel flat plate for correcting ... 04/05/07 - 20070076541 - Autofocus imaging optical system and image pickup device An image pickup device in which reflectance in a central portion of the splitting optical system is configured large and that in a peripheral portion is configured small, to thereby selectively reflect only a light beam for focus detection in focus detection means and transmit the other portions of the ... 03/22/07 - 20070064552 - Information recording and reproduction method and information recording and reproduction device The focus offset FE0 corresponding to minimum jitter is learned in advance. When performing spherical aberration adjustment for each disk, the spherical aberration is adjusted so that the jitter reaches a minimum, while maintaining the focus offset at FE0. The invention provides a method for performing high-precision adjustment of the ... 03/22/07 - 20070064551 - Optical disc apparatus An optical disc apparatus includes a withdrawal means for moving an objective lens (32) to a position distant from an optical disc (1) during an inactive duration of intermittent recording or reproducing operation. A means for regulating or fixing the objective lens (32) at the position distant from the optical ... 03/15/07 - 20070058501 - Optical pickup and adjustment method This optical pickup has a nonvolatile memory from which data can be electronically read out, and stores as data the difference between the spherical aberration when the readout signal jitter reaches a minimum, and the spherical aberration when the tracking error signal amplitude reaches a maximum. The positioning of an ... 03/08/07 - 20070053255 - Optical pickup apparatus An optical pickup apparatus having first and second light sources emitting first and second light fluxes having wavelength of λ1 and λ2, respectively, an light-converging optical system including first and second objective optical elements, and a lens holder to hold the first and second objective optical elements. When the optical ... 03/01/07 - 20070047401 - Optical system for collimating elliptical light beam and optical device using the same An optical system (20) for efficiently collimating an elliptical light beam includes a light source (21), a first lens (22), a second lens (23), and a third lens (24). The light source is adapted for providing an elliptical light beam defining different diverging angles in different directions, wherein any cross-section ... 02/22/07 - 20070041287 - Optical pickup apparatus capable of detecting and compensating for spherical aberration caused by thickness variation of recording layer An optical pickup apparatus, including a light source to emit light, an objective lens to form a light spot on an optical recording medium by focusing the light emitted from the light source, an optical division unit, disposed between the light source and the objective lens, to divide the light ... 02/08/07 - 20070030770 - Optical pickup and optical information processing apparatus An optical pickup performing recording, reproduction and deletion of information onto an optical recording medium, said optical pickup includes light sources of blue wavelength zone, red wavelength zone and infrared wavelength zone; a single object lens which condenses a light from any of the light sources; and a single aberration ... 02/01/07 - 20070025204 - Objective optical system for optical recording media and optical pickup device using it An objective optical system for optical recording media and an optical pickup device using the objective optical system includes a holographic optical element that includes angularly-multiplexed holograms for correcting spherical aberration and/or coma aberration due to variations in substrate thicknesses of recording media and errors by tilting the holographic optical ... 01/25/07 - 20070019515 - Optical writing device, optical writing method, and image forming apparatus A device, apparatus, method, computer program and product, each capable of controlling the intensity or duration of a light beam in a detection area of an optical writing device. The intensity of the light beam is one value when irradiating a detector, and a different value when irradiating an image ... 01/18/07 - 20070014206 - Optical pickup device and information processing apparatus incorporating the optical pickup A highly reliable optical pickup which is not likely to collide with an optical disk is provided. Relative positions of two objective lenses 100 and 101 (along a focus direction) on a lens holder 102 are determined so that, while the objective lens 101 having a longer working distance is ... 01/11/07 - 20070008837 - Optical disc drive for controlling reproduction of an optical disc including a plurality of data layers When recording or reading an optical disc having plural data recording layers, which data recording layer the light spot is focused on is detected to improve playback signal quality and signals written to the layer on which the light spot is focused are read more reliably. A convergent lens converges ... 01/11/07 - 20070008836 - Optical disk device An optical disk drive having a laser source for irradiating an optical beam onto an optical disk, a lens unit to focus the optical beam from the laser source onto the optical disk, a drive unit for driving the lens unit, and a high-frequency signal output unit for producing a ... 01/04/07 - 20070002702 - Aberration correcting method The present invention discloses an aberration correcting method for use between an optical disc drive and an optical disc. The optical disc drive includes an optical pickup head having an aberration-correcting unit and a control chipset. The method includes steps of: operating the optical pickup head in a focusing-locked and ... 12/14/06 - 20060280061 - Objective lens and optical information read/write device An objective lens, for an optical information read/write device that performs read/write operations on each of a plurality of optical discs using a corresponding one of three laser beams having first, second, and third wavelengths λ1, λ2, and λ3 (nm) satisfying a relationship λ1<λ2<λ3, respectively, includes a phase shift structure ... 10/26/06 - 20060239139 - Optical disk device and optical disk discriminating method An optical disk discriminating method and an optical disk device which can detect reflected rays for making discrimination among kinds of optical disks with high accuracies. By switching a plurality of lasers and moving a spherical aberration corrector while moving an objective lens to cause it to approach or keep ... 10/19/06 - 20060233072 - Optical head An optical head with excellent optical characteristics even when using a light source that substantially has a wavelength broadening is provided. The optical head includes a light source, an objective lens for focusing a light beam emitted from the light source on an information recording medium and a photodetector for ... 10/19/06 - 20060233071 - Optical head device and optical information apparatus using the same An optical head device includes a focusing optical system for focusing a laser beam emitted from a semiconductor laser light source on an optical information medium with an objective lens. A chromatic aberration correction element for correcting chromatic aberration occurring in the objective lens is provided between the semiconductor laser ... 10/19/06 - 20060233070 - Information recording/reproducing method and information recording/reproducing apparatus The amount of focus offset and the amount of spherical aberration correction are adjusted with respect to a disk on which no data is recorded with high precision. The amount of focus offset and the amount of spherical aberration correction are adjusted on the basis of (1) a focus error ... 10/12/06 - 20060227677 - Aberration detection device and optical pickup device provided with same An aberration detection device is arranged such that a distance L2 is longer than a distance L1, where the distance L1 is a shortest distance between the optical axis and a condensed light spot SP1, and the distance L2 is a shortest distance between the optical axis and a condensed ... 10/12/06 - 20060227676 - Optical element and light irradiation apparatus It is an object of the present invention to provide an optical element which forms a beam spot with homogeneous energy distribution on an irradiated surface, and a light irradiation apparatus. It is another object of the invention to provide a manufacturing method of a semiconductor device using a beam ... 10/05/06 - 20060221782 - Disk drive apparatus and spherical aberration correcting method A disk drive apparatus includes: an optical pickup irradiating a laser beam onto an optical disk having one or more recording layers through an objective lens and receiving the laser beam reflected from the optical disk; a driving unit moving the objective lens in an optical axial direction of the ... 09/28/06 - 20060215505 - Optical head device and optical information apparatus using the same An optical head device includes a focusing optical system for focusing a laser beam emitted from a semiconductor laser light source on an optical information medium with an objective lens. A chromatic aberration correction element for correcting chromatic aberration occurring in the objective lens is provided between the semiconductor laser ... 09/28/06 - 20060215504 - Optical head and optical disk apparatus An optical head comprises first and second light sources which are arranged next to each other and emit lights of different wavelengths and an optical device which is arranged between the first and second light sources and a conversing lens for reducing the spherical aberration caused by combination of the ... 09/21/06 - 20060209644 - Objective lens, optical pickup apparatus and optical information recording and/ or reproducing apparatus An objective lens according to the present invention is an objective lens used for an optical pickup apparatus, and the objective lens includes a superimposed structure on a surface of a lens with a power in which a first optical path difference providing structure changing spherical aberration in under-corrected direction ... 09/21/06 - 20060209643 - Optical scanning device The invention relates to an optical scanning device and to an optical wavefront modifier for use therein, for scanning an optical record carrier, such as an optical disk comprising an information layer. The device comprises a radiation source (9) for emitting an incident radiation beam; a detection system comprising an ... 08/31/06 - 20060193217 - Optical pickup and optical information reproducing device An optical pickup and an optical information recording and reproducing device in which spherical aberration correction control after a disc is loaded can be efficiently made in a short time. Before an information recording medium is loaded into a drive, an optical axis direction position of a concave lens is ... 08/17/06 - 20060181971 - Optical disk drive and optical pickup In an optical disk drive mounting a drive unit 20 having a control use circuit 21, and a pickup 1 having an aberration correction liquid crystal element 13 and a drive use circuit 2 which drives the aberration correction liquid crystal element, wherein the drive use circuit 2 stores astigmatic ... 08/03/06 - 20060171263 - Optical pick-up device An optical pick-up device comprising at least one micromirror array lens. The micromirror array lens enables focusing, tracking, and/or tilt compensation in the optical pick-up device without macroscopic motions. The micromirror array lens provides the device with a simple structure, which can reduce the size, weight, and cost of the ... 07/20/06 - 20060158972 - Optical element and optical scanning device using the same Provided is an optical element capable of reducing Fresnel (surface) reflection on a lens surface which causes flare or ghost, an optical system including the optical element, and an optical scanning device including the optical element. The optical element includes: a plurality of two-dimensionally arranged subwave structures having an anti-reflection ... 07/20/06 - 20060158971 - Objective lens for optical disk recording/reproducing device comprising variable lens formed by the interface of two immiscible fluids There is disclosed an objective lens (16),for use with optically readable disks of differing cover layer thicknesses, wich objective lens (16) comprises a variable lens (1) formed by the interface between two immiscible fluids (A, B), which variable lens (1) can be in one of at least two discrete states ... 07/13/06 - 20060153023 - Optical module An optical module according to the invention can achieve an optical system using a transmission-type diffraction grating for bending the optical path of incident light with a specific wavelength by about 90°. A substrate of the transmission-type diffraction grating is mounted at an angle in a range of ±5° with ... 07/06/06 - 20060146662 - Immersion optical system and optical apparatus having the same An immersion optical system that condenses light from a light source toward a first surface includes a lens having a concave lens surface closest to the first surface, a liquid being filled in a space between the concave lens surface and the first surface, wherein a conditional equation d>L/[2×tan {arcsin(NA/ni)}] ... 06/29/06 - 20060140072 - Optical pickup An optical pickup records information on an optical recording medium and retrieves information from the optical recording medium by radiating a light beam on the optical recording medium. The optical pickup includes a light source which emits the light beam. The optical pickup also includes an object lens which directs ... 06/29/06 - 20060140071 - Objective lens optical part for optical pickup device and focusing method using the same The present invention relates to an objective lens optical part for an optical pickup device and a focusing method using the same. The focusing method at least includes the steps of providing a first optical member and a second optical member corresponding to the first optical member, dividing a light ... 06/29/06 - 20060140070 - Optical information reproduction device An information recording medium (21) of the optical information reproduction device of the present invention includes a recording unit (3) capable of recording information three-dimensionally and provided with a track, and information is recorded by forming a plurality of recording marks along the track of the recording unit by a ... 06/22/06 - 20060133231 - Apparatus and method for controlling tracking servo in near field optics Disclosed are an apparatus and a method for controlling a tracking servo in a near field optics. Gap error signals are detected in a divided state, and a push pull signal is compensated based on the detected gap error signals. A photo detector detecting the gap error signals is divided ... 06/22/06 - 20060133230 - Optical recording using a waveguide structure and a phase change medium An apparatus comprises a slider having an air bearing surface, a first waveguide for directing electromagnetic radiation to a focal point adjacent to the air bearing surface, a storage medium position adjacent to the air bearing surface, a detector for detecting electromagnetic radiation reflected from the storage medium, and a ... 06/22/06 - 20060133229 - Low seek time optical media tracking system The present invention provides a system for causing an optical beam to impinge on a spot on an optical medium, while keeping an optical head apparatus in an essentially stationary position, such that it eliminates the need for a tracking function to move an optical head apparatus in order to ... 06/08/06 - 20060120228 - Recording apparatus In a recording apparatus for reproducing information recorded on a recording medium by utilizing near-field light, the recording apparatus realizes reliable information reproduction with a simple structure. Illumination light 20 is illuminated to the recording medium 10 to create near-field light on a surface of the recording medium 10. The ... 06/01/06 - 20060114772 - Laser processing device A laser processing device having an effect similar to that obtained by changing a focal length of a condensing lens. A part of a laser beam entering into a flat surface portion of the condensing lens is not condensed and radiated on a condensing point on a workpiece as a ... 06/01/06 - 20060114771 - Method and system for adjusting the servo control by monitoring the spot status on photo detector of optical pickup head The invention discloses a system and method for adjusting the servo controls by monitoring the spot status projected upon the photo detector of an optical pickup head. By utilizing a beam splitting device, the present invention splits the reflected laser beam which projects to photo detector originally into two reflected ... 05/04/06 - 20060092778 - Method of detecting focus error signal of optical head and optical recording/reproducing apparatus utilizing the same The invention relates to a method of detecting a focus error signal of an optical head to be used for controlling the focus position of an objective lens for converging a light beam on an optical recording medium and an optical recording/reproducing apparatus. The invention provides a method of detecting ... 05/04/06 - 20060092777 - 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 ... 04/20/06 - 20060083122 - Pickup lens with phase compensator and optical pickup apparatus using the same A pickup lens with a phase compensator is composed of a condenser lens and a phase compensator. At least one surface of the condenser lens has a step-like annular zone structure to compensate wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness ... 04/13/06 - 20060077794 - Objective optical system for optical recording media and optical pickup device using the objective optical system An objective optical system for focusing light from a light source onto at least two different types of optical recording media having different substrate thicknesses in order to record or reproduce information on the optical recording media includes at least two lens groups arranged along an optical axis for focusing ... 04/13/06 - 20060077793 - Optical pickup apparatus and objective optical element A light flux from the first light source forms a converged spot on first optical information recording medium by only a refraction action of the aspheric surface, or by a combination of the refraction action and an optical action given by at least one of the first phase structure and ... 04/13/06 - 20060077792 - Objective optical element and optical pickup apparatus A first phase structure corrects at least one of a spherical aberration due to a difference between a protective substrate thickness t1 and a protective substrate thickness t2 and a spherical aberration due to a difference between a first wavelength λ1 and a second wavelength λ2, and a second phase ... 04/13/06 - 20060077791 - Objective lens element and optical pickup device provided with its object lens element where, m is an imaging magnification. ... 04/13/06 - 20060077790 - Objective lens for optical pick-up devices, optical pick-up devices, and optical information recording and/or reproducing apparatus The present invention provides an objective lens for optical pick-up devices in which the amount of change in the astigmatic aberration is small when there is a temperature distribution that is not circularly symmetric with respect to the optical axis within an objective lens constructed with at least two optical ... 04/13/06 - 20060077789 - Lens holding member, focusing lens using lens holding member, optical pickup apparatus and optical recording and reproducing apparatus In a lens holding member for holding a solid immersion lens, when a difference-in-level portion and/or slant face is constructed at least on a part of the objective side surface, a tilt margin which can be applied to a near field optical recording and reproduction solid immersion lens can be ... 04/13/06 - 20060077788 - Solid immersion lens, focusing lens using solid immersion lens, optical pickup apparatus, optical recording reproducing apparatus and method of manufacturing solid immersion lens A convex portion is provided on the objective side of a solid immersion lens so as to protrude toward an optical recording medium and a difference-in-level portion or a concave portion is provided at least on a part of this convex portion. Then, there are provided a solid immersion lens ... 04/13/06 - 20060077787 - Phase offset integrated solid immersion mirror and lens for a general phase front An apparatus comprises a condenser for directing electromagnetic radiation to a focal point, the condenser comprising a first interface on a first side of a longitudinal axis for directing a first plurality of rays of the electromagnetic radiation to a focal point and a second interface on a second side ... 04/13/06 - 20060077786 - Optical lens assembly An optical lens set to form a lens comprising a first lens set element (30) including a lens (31) having a curved lens surface (32) having an entrance pupil with a first diameter (41), wherein the first lens set element if of a first width (39) taken along a direction ... 03/23/06 - 20060062104 - Lens unit for optical pick-up apparatus, optical element for optical pick-up apparatus, lens frame for lens unit, assembly method of the lens unit, and optical pick-up apparatus The lens unit for the optical pick-up apparatus has: the objective lens by which the projecting light from the light source is condensed on the information recording surface of the optical information recording medium; the phase control element which is arranged on the light source side to the objective lens, ... 03/23/06 - 20060062103 - Objective optical element, optical pickup apparatus and optical disc driving apparatus An objective optical element for use in an optical pickup apparatus for recording and/or reproducing information on first—third optical information recording media using first—third light fluxes respectively, includes: a first phase structure for compensating a deterioration in a performance forming the converged spot on the information recording surface of the ... 02/09/06 - 20060028932 - Optical pickup device An optical pickup device comprising a plane-parallel plate beam splitter that reflects a laser beam emitted from a laser beam source, an objective lens that focuses the laser beam from the plane-parallel plate beam splitter so as to irradiate the focused beam into a signal recording medium, a photodetector that ... 02/02/06 - 20060023578 - Optical lens, focusing lens, optical pickup device as well as optical recording and reproducing device With an optical lens made of a Y3Al5O12 monocrystal material of a cubic crystal structure, an optical lens having a high refractive index and a low optical absorption property in the range from an ultraviolet light wavelength to a visible light wavelength is provided, and using this optical lens, an ... 02/02/06 - 20060023577 - Optical recording and reproduction method, optical pickup device, optical recording and reproduction device, optical recording medium and method of manufacture the same, as well as semiconductor laser device An optical recording and reproduction method, optical pickup device, and optical recording and reproduction device are provided, in which an optical recording medium is irradiated with near-field light to perform recording and/or reproduction, and wherein two or more recording and reproduction beam spots are positioned in a recording and reproduction ... 01/26/06 - 20060018211 - Near-field light-emitting element and optical head A near-field light-emitting element includes a transparent medium having a plane of incidence into which a laser beam enters, and a light-condensing plane on which the laser beam having entered the plane of incidence is concentrated, and a metal body provided on the light-condensing plane of the transparent medium having ... 01/26/06 - 20060018210 - Light focusing optical system, optical pickup device and optical recording and reproducing device using the same, as well as light focusing method A light focusing optical system which focuses light, for recording to and/or reproducing from a plurality of optical recording media of different kinds, onto the recording media by using a diffraction element and lens; the diffraction element has at least first and second diffractive surfaces and; the first diffractive surface ... 12/01/05 - 20050265143 - Optical head device An optical head device may include an objective lens drive device for driving an objective lens, an optical path defining optical system which defines an optical path directing to the objective lens from the light source and an optical path directing to a light receiving element from the objective lens, ... 11/17/05 - 20050254360 - Focus control method for optical disk device The focus control method of the present invention includes: rotating an optical disk; driving an optical pickup upward and downward vertically to the optical disk at timing of a signal pulse detecting the rotational angle of the optical disk; detecting a focus drive value at timing at which the focal ... 11/17/05 - 20050254359 - Optical pickup An optical disc drive (I) comprises an optical pickup (3) with a 4-quadrant photo-detector (20); an objective lens (14) mounted displaceably with respect to the photo-detector (20); an optical displacement actuator (30) for displacing the objective lens (14); and a servo controller (70) for controlling the focus actuator (30). The ... 10/27/05 - 20050237873 - Method for adjusting focus or tracking detection unit, and optical disc device An optical disc device comprises a spherical or coma aberration correction unit to pre-correct spherical or coma aberration occurring in the light beam, a focus or tracking detection unit operable to detect a focus or tracking error signal, and an FE or TE amplitude adjustment unit operable to adjust the ... 09/22/05 - 20050207290 - Aberration correcting optical unit, optical pickup apparatus, and information recording/reproducing apparatus An aberration correcting optical unit includes an optical element for causing a phase change to light passing therethrough by the application of voltage and electrode layers for applying voltages to the optical element. The optical element is sandwiched between the electrode layers. At least one of the electrode layers includes ... 09/15/05 - 20050201221 - Object lens producing device and producing method An objective lens unit manufacturing apparatus for manufacturing an objective lens unit, with a numerical aperture not less than 0.7, made up by a plurality of lenses, includes a positioning mechanism (31) for positioning one lens (2) in a cylindrically-shaped lens holder (3) of a synthetic resin material, using another ... 09/15/05 - 20050201220 - Optical pickup device that corrects the spot shape of reflected light beams An optical head in which focussing error is detected by a spot size method used for recording and/or reproducing information signals on or from an optical disc. The optical head includes a unit for correcting the spot shape between the objective lens and a photodetector device. The spot shape correcting ... 09/08/05 - 20050195706 - Optical pickup device for optical disks having different track pitches Disclosed herein is an optical pickup device for optical disks having different track pitches. The optical pickup device performs tracking servo follow-up using the diffraction patterns of the side regions of a beam reflected and diffracted from an optical disk where a tracking error offset attributable to the left or ... 09/08/05 - 20050195705 - Optical pickup device The optical pickup device includes a light emitting unit for emitting a light beam focused on an optical disc having different track pitches; an optical unit for focusing the light beam emitted from the light emitting unit on the optical disc, dividing the light beam reflected from the optical disc ... 07/28/05 - 20050162995 - Optical pickup device, optical disk drive, optical device and composite optical element An optical pickup device is provided which includes a double-wavelength objective lens (34) that collects a light beam selectively emitted from a light-emitting/-detecting element (31) that selectively emits a plurality of light beams different in wavelength from each other, and also return light from an optical disk (2), a first ... 07/21/05 - 20050157611 - Optical lens and method of producing the same, method of producing optical lens array, focus error signal production method, and optical pickup apparatus An optical lens whose focal length is different on first and second planes perpendicular to each other is provided. The optical lens is configured such that a convex element which is formed integrally with a substrate having a flat face and has a convex curved face so as to have ... 06/23/05 - 20050135207 - Optical system for detecting data signal and tracking error signal In an optical system, reflected light from the disk is diffracted by a hologram optical element, and received by an optical detector. A focusing error signal is detected from −1st-order diffracted light of the hologram optical element. A tracking error signal by the differential phase method, a tracking error signal ... 06/23/05 - 20050135206 - Optical element, optical head, optical recording reproducing apparatus and optical recording/reproducing method The invention presents an optical element with which an optical head can be configured, in which there is little deterioration of the correctional effect when the objective lens shifts, as well as an optical head and an optical recording/reproducing apparatus using such an optical element. The invention also presents a ... 06/16/05 - 20050128896 - Optical head device and optical information recording/reproducing apparatus Light emitted from a semiconductor laser (1) is split by a diffractive optical element (3a) into a main beam and sub-beams. The diffractive optical element (3a) is divided into four regions by a straight line parallel to a tangential direction of a disc (7) and a straight line parallel to ... 06/09/05 - 20050122857 - Optical pickup When recording/reading information data onto/from a recording medium by irradiating the recording medium with a first light beam, correction for decreasing the amount of spherical aberration is made just before the recording or reading. On the other hand, when recording/reading information data onto/from a recording medium by irradiating the recording ... 06/09/05 - 20050122856 - Optical head device having deformable reflecting mirror In a mirror unit, for the purpose of correcting spherical aberration, a reflecting mirror is changed in form by a piezoelectric film to adjust a degree of parallelism of a reflected light. To correct the spherical aberration at an objective lens, the piezoelectric film changes the degree of parallelism of ... ### FreshPatents.com Support - Terms & Conditions |