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| Number | Title | Issue Date |
| 8174939 | Optical head and optical disc device An optical head includes a diffraction element capable of improving the quality of a TE signal by a DPP method even if light amounts of two sub-spots are unbalanced for optical discs having different groove pitches. In a three-beam optical head, a diffraction elemen... | 05/08/2012 |
| 8111592 | Optical pickup An optical pickup is provided with a protector which prevents collision between an objective lens and an optical recording medium. The protector includes: a first sheet material which is arranged on an uppermost layer, has durability for abrasion against the collisi... | 02/07/2012 |
| 8089832 | Method and apparatus for immediately writing or reading files on a disc-like recording medium having control information on defect management A method and apparatus for recording digital information signals on a removable rewritable medium include recording control information on defect management. The recording medium includes predefined locations for enabling booting and/or file system read/write, where... | 01/03/2012 |
| 8064299 | Optical pick-up In an optical pick-up used in common with DVD/CD and BD, when the thickness is intended to be reduced by mounting a total reflection mirror, a cavity for passing through a laser light is necessary and, since this decreases the degree of freedom for arranging trackin... | 11/22/2011 |
| 8050152 | Optical pickup unit and optical disc apparatus An optical pickup unit comprising: an objective lens that focuses laser light on an optical disc; a lens holder that holds the objective lens; a coil that is fitted on the lens holder and capable of driving the lens holder; and a reinforcement member that is fitted ... | 11/01/2011 |
| 8045425 | Optical disk apparatus and optical pickup An optical disk apparatus includes a light source that emits a light flux. A light source drive circuit causes the light source to emit the light flux. An optical base has an optical system disposed thereon. The optical system includes an objective lens for guiding ... | 10/25/2011 |
| 8040763 | Objective lens driving device and optical pickup device An objective lens driving device includes a lens holder (3) holding an objective lens (1, 2), a stationary part (5) that supports the lens holder (3) via wires (7a, 7b), an electromagnetic coil (11a | 10/18/2011 |
| 8009523 | Optical pickup and method for manufacturing the same To increase the speed of operations and improve vibration properties by rotating holders to wind coils in objective lens driving means of an optical pickup. In an optical pickup wherein a tracking coil and two focusing coils are wound on the same surface of a coil h... | 08/30/2011 |
| 7969828 | Optical pickup actuator and optical recording and/or reproducing apparatus having the same An optical pickup actuator independently drivable in focusing, tilting and tracking directions. The optical pickup includes a lens holder movably installed on a base, and mounted with an objective lens for transmitting an incident light to an optical information rec... | 06/28/2011 |
| 7944783 | Write-once optical disc and method for managing spare area thereof Disclosed is a write-once optical disc and method for managing a spare area thereof, the write-once optical disc possibly having a temporary defect management area within one or more spare areas. The method includes the steps of: allocating one or more spare areas i... | 05/17/2011 |
| 7920443 | Objective lens, optical pick-up device, and optical disk device An optical pickup device includes light sources for respectively emitting a plurality of different wavelengths of light, a unit structured for causing at least a part of the light emitted from the light sources to pass a same optical path; and a focusing unit for fo... | 04/05/2011 |
| 7920442 | Objective lens, optical pick-up device, and optical disk device An optical pickup device includes light sources for respectively emitting a plurality of different wavelengths of light, a unit structured for causing at least a part of the light emitted from the light sources to pass a same optical path; and a focusing unit for fo... | 04/05/2011 |
| 7876648 | Optical pick-up capable of eliminating stray beams An optical element is disposed on an optical path between a beam branching element and a photodetector. The optical element is disposed at a focal position of a stray light beam reflected by a recording layer except a target recording layer, and shields or attenuate... | 01/25/2011 |
| 7872951 | Actuator for optical pickup An actuator capable of providing movement forces in a first direction, a second direction, and a third direction is provided. The actuator includes two sets of repelling permanent magnets and yokes, a focusing coil, a tracking coil, and a tilting coil. The repelling... | 01/18/2011 |
| 7869313 | Optical pickup actuator An optical pickup including a moving unit including a lens holder on which an objective lens is positioned, a set of suspension wires to movably support the lens holder on a base of the optical pickup actuator, each suspension wire having one end fixed to a side of ... | 01/11/2011 |
| 7848186 | Objective lens and method of manufacturing optical pickup apparatus An objective lens focusing light emitted from a light source onto an information surface of an optical disk, comprising: a first lens surface to be positioned on the light-source side; a second lens surface to be positioned on the optical-disc side; a first edge sur... | 12/07/2010 |
| 7839730 | Optical pickup and optical disk drive apparatus An optical pickup includes an objective lens, a protection member for protecting the objective lens, and a lens holding member configured to hold these members. The optical pickup records and/or reproduces an information signal on and/or from an optical recording me... | 11/23/2010 |
| 7835234 | Objective lens driving device and optical disc apparatus Both of two permanent magnets which are arranged in an objective lens driving device are multipole magnetized magnets having rectangular parallelepiped shapes. The two permanent magnets have inverse N-S polarity at a part of surfaces which face each other. Focusing ... | 11/16/2010 |
| 7830755 | Optical head and optical disc drive The present invention provides an optical head for realizing the stable operation by controlling the temperature of the semiconductor laser to a low level by reducing the heat transfer rate from a laser driver IC to a housing in the vicinity of a semiconductor laser... | 11/09/2010 |
| 7817505 | Optical pickup actuator and optical recording and/or reproducing apparatus and method for the same An optical pickup actuator and an optical recording and/or reproducing apparatus and method using the same. The optical pickup actuator includes a blade, a plurality of suspensions, first and second coil members, and a magnet member. An objective lens is placed on o... | 10/19/2010 |
| 7782720 | Method for driving an actuator, actuator drive, and apparatus comprising an actuator An actuator driver circuit includes a drive signal source and an electrical damping element having a negative resistance connected in series with the drive signal source. A controllable switch is provided for selectively switching the electrical damping element into... | 08/24/2010 |
| 7778119 | Objective lens holding device and optical pickup apparatus An objective lens holding device includes a first objective lens, a second objective lens, and a lens holder, wherein an axis-to-axis distance between a central axis of the first objective lens and a central axis of the second objective lens is set to a distance, de... | 08/17/2010 |
| 7746733 | Optical pickup unit and optical disc apparatus An optical pickup unit is disclosed which comprises: an objective lens that focuses laser light on an optical disc; a lens holder that holds the objective lens; a coil that is fitted on the lens holder and capable of driving the lens holder; and a heat transfer impr... | 06/29/2010 |
| 7729212 | Objective lens driving device, optical pickup device, and optical disk drive The objective lens driving device of the present invention for an optical pickup device is provided. The device includes first and second objective lenses, and a lens holder for supporting the first and second objective lenses. The lens holder has a first through-ho... | 06/01/2010 |
| 7688689 | Head with optical bench for use in data storage devices A head assembly comprises a slider including a transducer and a coupler for coupling electromagnetic radiation into the transducer, and an optical bench positioned adjacent to the slider, the optical bench including a mirror and a lens for directing electromagnetic ... | 03/30/2010 |
| 7684289 | Actuator for optical pickup, optical pickup, and apparatus for reading or recording information A high reading performance is secured in an optical pickup even if magnets are miniaturized. In an optical pickup, around a lens holder which holds a lens, track coils are wound from a range of a flange of the lens to the outside in a diameter direction. The track c... | 03/23/2010 |
| 7684290 | Object lens actuator In an object lens actuator, stiffness of a lens holder is improved and the higher order resonance frequency is sufficiently increased. The stiffness of the lens holder is improved by providing a flat plate perpendicular to the focusing direction between the side wal... | 03/23/2010 |
| 7672197 | Optical pickup device and manufacturing method thereof An optical pickup device having a lens through which light transmits, a holder to which the lens is mounted, a position adjusting member which is mounted on the holder, and a housing to which the holder is mounted has a structure to allow adjustment of a mounting po... | 03/02/2010 |
| 7668048 | Optical head and optical disc device provided therewith In an optical head according to the present invention, an act base on which an objective lens is arranged is formed in a rectangular shape with through holes formed in four corners thereof. A base on which a collimating lens is arranged has projections to engage wit... | 02/23/2010 |
| 7656756 | Coil rotation preventing structure for optical pick-up actuator An optical pickup actuator includes a lens holder on which tracking and focusing coils are attached, at least one of the coils being a polygon coil having at least two sides that are different in a length from each other, magnets disposed facing the coils, and a rot... | 02/02/2010 |
| 7652957 | Lens driving mechanism and image pickup device A lens driving mechanism eccentrically drives at least one lens or lens subunit, hereunder called a correcting lens, in a lens system constituting a taking lens unit in a plane perpendicular to an optical axis direction, and includes a movable frame holding the corr... | 01/26/2010 |
| 7643385 | Optical pickup To improve the reliability to an environmental temperature change of an optical pickup, an optical pickup 7 has a semiconductor laser 711 for generating a laser beam. An objective lens drive leads the laser beam to a predetermined position of a disk. T... | 01/05/2010 |
| 7636279 | Objective lens actuator and optical pickup device having the same An objective lens actuator is provided with an objective lens holder and a tilting coil that drives the objective lens holder in a tilting direction. The tilting coil is inclined with respect to the horizontal direction, so that a rotation center when the objective ... | 12/22/2009 |
| 7619951 | Optical pickup actuator and optical recording and/or reproducing apparatus An optical pickup actuator, including a lens holder movably installed on a base, and mounted with an objective lens to transmit an incident light to an optical information recording medium, and a magnetic circuit to independently drive the lens holder in a focusing ... | 11/17/2009 |
| 7613080 | Optical pickup device and manufacturing method thereof To provide an optical pickup device in which an optical parts module is fixedly adhered in a high positional precision to an optical pickup case, such that the adhesion strength can be sufficiently enhanced against a stress to be applied to the adhering faces from a... | 11/03/2009 |
| RE40928 | Optical pickup An optical pickup comprises an objective-lens driving device including a movable section provided with an objective lens, a focusing coil, and tracking coils, and a fixed section provided with a single magnetic circuit having a magnetic gap, the focusing coil and th... | 10/06/2009 |
| 7593294 | Optical pickup An optical pickup includes a lens frame, and the lens frame includes protruding portions provided with through-holes, coil connecting portions protruding away from a supporting-wire holding portion at corners. The coil connecting portions are provided with cutout po... | 09/22/2009 |
| 7570546 | Optical pick-up and optical disk device An optical pick-up including an objective lens for collecting/irradiating laser light onto an optical disk, and an objective lens holding member for holding the objective lens. A plurality of cutout portions for injecting therein an adhesive for fixing the objective... | 08/04/2009 |
| 7564745 | Optical pickup and optical disk apparatus An optical pickup includes a first optical system for collecting first laser light emitted from a first laser light source onto a first disk, and guiding reflected light from the first disk to a photoreceptor; a second optical system for collecting second laser ligh... | 07/21/2009 |
| 7564746 | Optical disk apparatus An optical disc apparatus includes a pickup assembly, a first printed circuit board, a second printed circuit board, and a flexible printed circuit board. The pickup assembly is adapted to focus a laser beam through an objective lens onto an optical disc in order to... | 07/21/2009 |
