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| Number | Title | Issue Date |
| 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 |
| 7990834 | Optical pickup device recording and/or reproducing information on and/or from a plurality of kinds of recording media An optical pickup device has a semiconductor laser emitting light which is in turn branched via a diffraction grating into at least three beams of light including a main beam and two sub beams which are in turn condensed via an objective lens on an optical disk at a... | 08/02/2011 |
| 7855944 | Optical element, optical pickup device and optical information recording and reproducing apparatus An optical element for use in an optical pickup device to conduct reproducing and/or recording information for a first disk including a protective substrate by the use of a first light flux emitted from a first light source and to conduct reproducing and/or recordin... | 12/21/2010 |
| 7738345 | Optical disc drive and objective lens for the same There is provided an objective lens used for three types of optical discs including by selectively using one of three types of light beams. At least one of surfaces of the objective lens is provided with a first region converging the third light beam on a recoding s... | 06/15/2010 |
| 7701832 | Optical record carrier scanning device An optical scanning device scans optical record carriers, such as three optical record carriers, where each optical record carrier has an information layer having a depth which is different from the information layer depth of other optical record carriers, where d | 04/20/2010 |
| 7564764 | Optical element, optical pickup device and optical information recording and reproducing apparatus An optical element for use in an optical pickup device to conduct reproducing and/or recording information for a first disk including a protective substrate by the use of a first light flux emitted from a first light source and to conduct reproducing and/or recordin... | 07/21/2009 |
| 7539117 | Optical pickup An optical pickup has a semiconductor laser, a diffractive optical element that has first diffraction regions and second diffraction regions and diffracts a beam emitted by the semiconductor laser, an objective lens that focuses the diffracted beam on an optical dis... | 05/26/2009 |
| 7486606 | Optical head and optical information apparatus for recording or reproducing information on an information recording medium An optical head which is capable of realizing a stable tracking control, even if the rotational center of an information recording medium is not located on the extension line of the transfer directions of a light-concentrating element, includes: a semiconductor lase... | 02/03/2009 |
| 7355933 | Optical pickup device Substantially all of the laser light emitted from laser chip(s) 11 toward optical disk(s) 17 may be transmitted through polarizing hologram(s) 13 and may thereafter be transmitted through quarter-wave plate(s) 15, and after being reflecte... | 04/08/2008 |
| 7301864 | Objective lens, optical pick-up device, and optical disk device To provide an optical pickup device and optical disk device capable of realizing at least one of thickness reduction, size reduction and suppression against characteristic deterioration even where coping with various wavelengths of laser including a blue laser. An o... | 11/27/2007 |
| 7292517 | Optical scanning device for use with multiple types of record carrier surfaces An optical scanning device for scanning of a first, second and third type of optical record carrier with radiation of a first wavelength λ1, a second wavelength λ2 and a third wavelength λ3, respectively, where the three wavelengt... | 11/06/2007 |
| 7283448 | Integrated optical pickup and method of manufacturing the same and optical information storage system including the optical pickup An integrated optical pickup and a manufacturing method thereof, and an optical information storage system including the pickup. The integrated optical pickup includes a light source; a main photo-detector, which receives light emitted from the light source and refl... | 10/16/2007 |
| 7266070 | Objective lens for different optical recording media and an optical pickup device utilizing it An objective lens and an optical pickup device utilizing it are disclosed wherein the objective lens includes a specified aspheric surface profile having a discontinuity and a single specified diffraction optical surface so to provide a focusing effect which is usab... | 09/04/2007 |
| 7260047 | Optical pickup that uses light sources with different wavelengths for each of multiple recording mediums An optical pickup includes: a first projector for projecting a first light beam of a first wavelength so as to record and reproduce information with respect to an optical disk having a first light transmissive layer; a second projector for projecting a second light ... | 08/21/2007 |
| 7239596 | Optical pickup device and optical recording medium driving apparatus There is disclosed an optical pickup device including: a blue semiconductor laser which emits a first laser light having a wavelength of 450 nm or less to record on or reproduce from an extra-high density optical disc; a red semiconductor laser which emits a second ... | 07/03/2007 |
| 7236444 | Wavefront aberration correcting device and optical pickup equipped with the same An object of the present invention is to provide a wavefront aberration correcting device comprising a liquid crystal device that maximizes transmittance and minimizes light transmittance fluctuations even when the liquid crystal is driven by voltage. Disclosed is a... | 06/26/2007 |
| 7230904 | Compatible optical disk player and data recording and reproducing method A simulation device for simulating an operation of a system constituted by a plurality of machines. An operation program is executed by an arithmetic processing unit in a controller of a machine or by an information processing device having a function of analyzing t... | 06/12/2007 |
| 7221492 | Scanning device including an objective system with a lens protection device An optical scanning device (1) for scanning an information layer (4) of an optical record carrier (2), the device (1) comprising a radiation source (11) for generating a radiation beam (12, 15, 20) and an objective system ( | 05/22/2007 |
| 7215476 | Optical pickup, optical information recording/reproducing apparatus using the same, and phase variable wave plate used in the pickup and the apparatus Laser beams respectively emitted from a SHG blue laser unit and a red semiconductor laser unit that have photo detectors respectively are turned into parallel lights by a collimator lens and then coupled by a dielectric multi-layer film mirror so as to be propagated... | 05/08/2007 |
| 7186006 | Reduced-footprint night illumination laser system The present invention provides for a laser diode light diffusion unit that comprises a casing 10 with a lens cover that holds a laser diode mounted 2 on a heat sink 16, a mirror 12, a collimator lens 4 and a holographic diffusion s... | 03/06/2007 |
| 7179536 | Optical element having a low surface roughness, an optical pickup device including the optical element, and a die for making the optical element An optical pickup device for recording and/or reproducing information in an optical information recording medium, comprises a light source to emit light flux having a central wavelength not longer than 500 nm; a converging optical system to converge the light flux e... | 02/20/2007 |
| 7173897 | Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a first light source for emitting first light flux having a first wavelen... | 02/06/2007 |
| 7158468 | Optical system for optical head An optical system for an optical head of an optical disc drive is capable of using first and second discs, protective layer of the second disc being thicker than that of the first disc, a data density of the second disc being lower than that of the first disc. A lig... | 01/02/2007 |
| 7120107 | Optical head for optical recording having a hologram element that generates multiple diffracted light beams of different orders An optical head is provided, which suppresses the offset in the tracking error signal. This head comprises (a) a light source for emitting a light beam to be irradiated to an optical recording medium as an incident light beam; (b) a hologram element for receiving a ... | 10/10/2006 |
| 7106525 | Objective lens for optical pick-up There is provided an objective lens for an optical pick-up used for different types of optical discs. The objective lens has at least one surface on which a plurality of annular zones are formed. The at least one surface is divided into an inner area having a low NA... | 09/12/2006 |
| 7106771 | Semiconductor laser device and optical pickup device A semiconductor laser device has a semiconductor laser and a polarizing diffraction grating that is arranged ahead of the semiconductor laser. A reflected light from an optical recording medium is diffracted by the polarizing diffraction grating according to the pol... | 09/12/2006 |
| 7102992 | Contact optical head for data storage Techniques and devices based on contact optical heads in optical storage devices and systems. In one implementation, a load actuator is provided in an optical storage device and is operable to apply a force to cause the optical head to contact the optical disk at a ... | 09/05/2006 |
| 7088645 | Optical pickup apparatus compatible with different types of optical recording mediums A polarizing beam splitter for separating an upstream beam from a downstream beam according to the polarization of an incident beam is provided between first and second light sources emitting laser beams at respective wavelength and an objective lens. A phase plate ... | 08/08/2006 |
| 7079471 | OPTICAL PICKUP USING TWO LASER BEAM SOURCES OF DIFFERENT WAVELENGTHS FOR AN OPTICAL DISK DRIVE AND A CONVERTER TO OPTIMIZE A LIGHT BEAM REFLECTED OFF AN OPTICAL DISC FOR DETECTION BASED ON REFLECTED LIGHT BEAM WAVELENGTH First and second laser beam sources generate first and second laser beams of different wavelengths, respectively. A first collimating lens diverges the first laser beam at a predetermined angle so as to permit a fracture surface aberration of the first laser beam to... | 07/18/2006 |
| 7068933 | Apparatus and method for detecting beam power in optical drive An apparatus and method for detecting beam power generated by a plurality of light sources, using a single device. The apparatus includes a light-receiving unit that receives the beam power generated by one of a plurality of light sources, and an amplifying unit tha... | 06/27/2006 |
| 7050207 | Optical pickup device using hologram pattern and hologram pattern generating method Astigmatism and coma are suppressed in an optical pickup device such that light from a single real laser light source is diffracted and divided by a hologram module into a plurality of light spots which are focused upon a plurality of tracks of an optical disk to re... | 05/23/2006 |
| 7036979 | Photothermal transducing spectroscopic analyzer In a photothermal spectroscopic analyzer in which a probe light is made to fall on a thermal lens produced in a sample by an input of an excitation light and the sample is analyzed in accordance with a change of the probe light which is caused by the thermal lens, a... | 05/02/2006 |
| 7035196 | Optical head device and optical recording and reproducing apparatus having lasers aligned in a tangential direction A semiconductor laser element has the following configuration: a dual-wavelength monolithic laser where semiconductor lasers with emission wavelengths of 650 nm and 780 nm are integrated on one chip is soldered on a heat sink which then is soldered on a can package.... | 04/25/2006 |
| 7027369 | Optical pickup apparatus for simultaneously reading data from a plurality of tracks of an optical disc An optical pickup apparatus (10) for reading data from a plurality of tracks of an optical disc (34) at the same time by focussing spots (M, . . . ) of each light beam on a plurality of tracks, passing the reflected light beams of spots (M, . . . ) seq... | 04/11/2006 |
| 7023788 | Objective lens for optical discs An objective lens for two or more types of optical discs of different standards is provided. A surface of the objective lens is formed with a diffracting structure, and has an inner area including an optical axis and an outer area. The outer area is configured such ... | 04/04/2006 |
| 7017812 | Variable distance angular symbology reader A variable distance angular symbology reader utilizes at least one light source to direct light through a beam splitter and onto a target. A target may be angled relative to the impinging light beam up to and maybe even greater than 45°. A reflected beam from the t... | 03/28/2006 |
| 6999221 | Bimorphic polymeric photomechanical actuator A bimorphic polymeric photomechanical actuator, in one embodiment using polyvinylidene fluoride (PVDF) as a photosensitive body, transmitting light over fiber optic cables, and controlling the shape and pulse duration of the light pulse to control movement of the ac... | 02/14/2006 |
| 6995909 | Lens, optical head, optical information writing/reading apparatus and optical information recording medium writing/reading method Conventional lenses for DVD/CD compatible writing/reading are liable to CD jitter deterioration due to phase shifts in a central area. Setting a corresponding base material thickness of an intermediate area of the circumference A2 to greater than 1.2 m... | 02/07/2006 |
| 6956807 | Optical head for scanning a record carrier A device for scanning a first and second type of optical record carriers (2; 40) generates a first and a second radiation beam for scanning the first and second type of record carriers, respectively, the first radiation beam having a first numerical aperture ... | 10/18/2005 |
| 6937554 | Optical pickup apparatus having an improved holographic unit, and optical disk drive including the same In an optical pickup apparatus of the present invention, either a first laser diode emits a laser beam having a first wavelength or a second laser diode emits a laser beam having a second wavelength. An optical system focuses one of the two laser beams onto a record... | 08/30/2005 |
