Assignee: Hitachi Media Electronics Co., Ltd.

Location: Iwate, JP
No. of patents: 49

Number	Title	Issue Date
8184509	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 amplificat...	05/22/2012
8169875	Optical pickup device and method of manufacture therefor An optical pickup device includes a holder which holds an LD and a light-receiving element and an optical pickup case on which the holder is adhesively fixed via an ultraviolet cure adhesive, and is provided with a through hole on a bonding surface of the holder in ...	05/01/2012
8154962	Optical pickup and optical information recording and reproducing device An optical pickup equipped with a laser light source which emits light beams of at least three wavelengths for recording/reproducing a plurality of information recording media detects light quantities of the light beams of three wavelengths using one light intensity...	04/10/2012
8149678	Diffraction grating, optical pickup and optical disc device Undesired disturbance components leak eventually into various detection signals and reproduction signals as stray optical beams reflected from recording layers other than a reproduction layer overlap with signal beams on a light reception surface of an optical detec...	04/03/2012
8144565	Optical head and apparatus using the same An optical head and an apparatus using the optical head are shown. The optical head includes a light-emitting element, a first polarized light diverging element for transmitting the light beam of a first polarization direction and reflecting the light beam of a seco...	03/27/2012
8121000	Optical disk apparatus In an optical disk apparatus, an optical pickup includes an actuator for driving an object lens, and a sensed signal output part for making it possible to generate a tracking error signal and a lens error signal by addition/subtraction, and a signal processor includ...	02/21/2012
8094542	Optical pickup device, optical disc device, and diffraction grating An optical pickup device and an optical recording/reproduction device are provided that can suppress a tracking error signal offset generated in the boundary between an unrecorded area and a recorded area. A three-beam diffraction grating is divided into two areas. ...	01/10/2012
8094541	Optical pickup and optical disc apparatus An optical pickup free from tracking error signal variation when playing back a double-layered disc, and coping with incompatible optical discs, such as BDs and HD DVDs, includes a laser light source, a first polarization rotation element for rotating a polarization...	01/10/2012
8081550	Optical pickup device In a multilayer disc has an increased number of recording layers) spaced by spacing from each other, a generation interval between focus error (FE) signals detected from the respective recording layers becomes small. This causes mutual interference between the FE si...	12/20/2011
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
8046785	Objective lens actuator and a disc apparatus applying the same therein An objective lens actuator comprises a lens holder for attaching an objective lens thereon, a piece of focusing coil, being wound along side surface of the lens holder around the objective lens, and three magnets, being disposed opposing to two surfaces each having ...	10/25/2011
8040780	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 photode...	10/18/2011
8031565	Optical pickup and optical information reproduction system In an optical disk apparatus having an exclusive RF detector plane mounted therefore, as a method of obtaining a synthesized readout signal based on band-synthesis is used in order to obtain a readout signal having a good S/N ratio, a waveform distortion easily caus...	10/04/2011
8023367	Objective lens actuator and disc drive employing the objective lens actuator An object lens actuator can improve workability and operate with high reliability by prevention of damage to the object lens actuator and a disc and sticking of a moving part caused by an excessive movement of the moving part. In a disc drive employing the object le...	09/20/2011
8004956	Optical disc drive, optical pickup and optical component used therefor Provided are an optical pick up and an optical component used for the optical pickup which are capable of preventing or restraining occurrence of deviation and unbalance which are caused by assembly errors during manufacturing of optical components, a temperature va...	08/23/2011
8000183	Object lens actuator, optical pickup and optical disk drive The present invention provides an object lens actuator, an optical pickup, and an optical disk drive, which can increase the size of the object lens actuator driving a lens holder in the tangential tilt direction, and drive and control the lens holder with a small a...	08/16/2011
7995450	Optical element feeding device and optical pickup unit using the same In an optical element feeding device and an optical pickup unit using the same, in order to make the device compact and light and achieve a stable operation, the device has a main shaft and a sub shaft supporting a movable frame in which an optical element is arrang...	08/09/2011
7990813	Optical pickup device An optical pickup device includes a hosing having three walls connected together whose horizontal cross-section is substantially U-shaped. A first wall supports one end of a shaft, a second wall facing the first wall supports the other end of the shaft and a third w...	08/02/2011
7986075	Film bulk acoustic wave resonator, its fabrication method and film bulk acoustic wave resonator filter using the resonator The film bulk acoustic wave resonator includes a laminate structure composed of a piezoelectric layer, and first and second electrode layers interposing at least part of the piezoelectric layer, in which the first metal electrode is dispersively formed on an electro...	07/26/2011
7978587	Optical pickup apparatus and optical disc apparatus with a single beam system An optical pickup apparatus is provided with a dividing element having a plurality of regions. The dividing element is capable of dividing a light flux reflected by the optical disc into a plurality of light fluxes having different outgoing directions. Each region o...	07/12/2011
7975275	Object lens actuator and disc drive using the same The present invention has an object to provide an object lens actuator that reduces the amplitude of vibration of an object lens related to a torsional vibration of a lens holder and to enable a disc drive using the same to record information on a disc at high speed...	07/05/2011
7965594	Optical pickup and optical disc apparatus When recording/reproducing an optical disc having a recording layer of multi-layer structure, an unwanted optical beam reflected from a recording layer other than a target layer for recording/reproduction is incident on a photodetector to cause an unwanted disturban...	06/21/2011
7948841	Diffraction grating, optical pickup device and optical disc apparatus A pickup device splits and detects a light beam reflected from a disc with the use of a grating. The grating has first to six areas, wherein the first area and the second area, the third area and the fifth area, and the fourth area and the sixth area are arranged in...	05/24/2011
7945232	Multiband wireless device and semiconductor integrated circuit When switching over from a portable telephone system of 800 MHz band to a UWB communication system of 9 GHz band, depending upon a signal for changing over a high pass filter and a low pass filter, a reactance element, which is determined to be matching with a load ...	05/17/2011
7940630	Optical pick up apparatus with a single beam system and having a diffraction grating An optical pickup apparatus includes a semiconductor laser for emitting a laser light, an objective lens for irradiating the light flux emitted from the semiconductor laser onto an optical disc, and a light detector for receiving the light flux reflected from the op...	05/10/2011
7936658	Photodetector, diffraction grating, optical pickup and optical disc apparatus The present invention provides a photodetector capable of generating highly accurate tracking and focusing error signals free of variations in light quantity caused by interference, in an optical pickup with a two-wavelength multilaser. The photodetector comprises f...	05/03/2011
7933174	Optical pickup with support part having hole for being inserted with a projection part of a case An objective lens actuator in an optical pickup, having a semiconductor laser diode, electro-optic parts, such as a lens or the like, as well as, the objective lens actuator, etc., in a case, comprises: a holder, which mounts an objective lens and a coil thereon, as...	04/26/2011
7890967	Optical pickup device with heat radiating structure An optical pickup device 50 comprising a laser diode 1, a photo detector 2, a housing 3 having an optical system for guiding light from the laser diode 1 to an optical disk and guiding light reflected on the optical disk to the pho...	02/15/2011
7889625	Optical pickup and optical disk driving apparatus using the same An operation mode is arranged to be switched between in recording/reproducing and in adjustment. A switching circuit with a hold circuit therefor is on a light receiving element including an optical pickup having a laser light source emitting a laser beam, an object...	02/15/2011
7885166	Optical pick up apparatus with a single beam system and having a diffraction grating An optical pickup apparatus includes a semiconductor laser for emitting a laser light, an objective lens for irradiating the light flux emitted from the semiconductor laser onto an optical disc, and a light detector for receiving the light flux reflected from the op...	02/08/2011
7876031	Piezoelectric thin-film acoustic wave device and information processing unit using the same A piezoelectric thin-film acoustic wave device formed of a piezoelectric thin film of AlN on the +C plane and having the polarization strength of not lower than 0.63×10−20 F/V and an information processing unit using the same are disclosed. This is the...	01/25/2011
7873970	Optical pickup device and optical disc drive apparatus The present invention provides an optical pickup device employing a disc protector that includes a plurality of first protrusions and at least one second protrusion disposed on the lens holder, wherein the first protrusions are formed by applying a first adhesive to...	01/18/2011
7859774	Objective lens actuator and a disc apparatus using the same therein An objective lens actuator which drives an objective lens in a focusing direction and a tracking direction, so as to focus lights on a recording surface of an optical disc, as a recording medium of information. The objective lens actuator includes a magnet, a lens h...	12/28/2010
7817094	Antenna, and wireless module, wireless unit and wireless apparatus having the antenna In an antenna that has high sensitivity to frequencies of narrow bands and over a wide band and that can be small-sized, and in a wireless module, wireless unit and wireless apparatus using this antenna, the antenna is comprised of a transmission line, and variable ...	10/19/2010
7773488	Information reproducing apparatus In an information reproducing apparatus in which a liquid crystal lens element is used for the selection and switching of layers, the instability of servo control during the switching of the layers due to the overlapping of signals from two layers is eliminated and ...	08/10/2010
7760691	High-frequency circuit apparatus and communication apparatus using the same A high-frequency circuit has a duplexer and a filter. The duplexer performs wave separation of send and received signals as input thereto. The filter filters the input send signal. When the send and received signals of the first modulation method are input, the send...	07/20/2010
7745975	Piezoelectric thin film resonator, piezoelectric thin film resonator filter and manufacturing method thereof A piezoelectric thin film resonator includes: a piezoelectric thin film; a laminated structure which includes a first metal electrode film and a second metal electrode film that interpose at least a part of the piezoelectric thin film, and which is formed on a subst...	06/29/2010
7739703	Optical pickup device and optical disc drive An optical pickup device having an optical module provided with an optical element and bonded and fixed to an optical pickup case, wherein the optical module is fixed to the optical pickup case by a first ultraviolet curing adhesive at at least two positions with an...	06/15/2010
7714787	Antenna, and wireless module, wireless unit and wireless apparatus having the antenna In an antenna that has high sensitivity to frequencies of narrow bands and over a wide band and that can be small-sized, and in a wireless module, wireless unit and wireless apparatus using this antenna, the antenna is comprised of a transmission line, and variable ...	05/11/2010
7675832	Optical element feeding device driving method and optical disk apparatus An optical element feeding device driving method and an optical disk apparatus capable of detecting biting in a stepping motor and conducting restoration. The optical disk apparatus includes an optical element feeding device including a movable frame for supporting ...	03/09/2010

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Assignee: Hitachi Media Electronics Co., Ltd.