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| Number | Title | Issue Date |
| 8165003 | Optical pickup device A first laser source is arranged on a transmitting side of a polarizing beam splitter, while a second laser source is arranged on a reflecting side of the polarizing beam splitter. The splitting surface of the polarizing beam splitter has a film characteristic of su... | 04/24/2012 |
| 8125874 | Optical pickup device An optical pickup device has a DVD/CD laser diode for emitting a DVD/CD laser beam as linear polarized light, and a BD laser diode for emitting a BD laser beam. The optical pickup device has a dichroic mirror that regularly reflects a part of the DVD/CD laser beam, ... | 02/28/2012 |
| 8064316 | Optical system, optical pickup apparatus, and optical disc apparatus for extracting signal beams An optical system for efficiently extracting plural signal beams from a bundle of rays reflected from a multilayer optical disc. ... | 11/22/2011 |
| 8040781 | Wavelength selecting wavelength plate and optical head device using it An optical rotating plate has an optical rotating material layer. A phase plate is provided on a first surface side of the optical rotating plate and has at least one birefringent material layer. The first surface side is disposed toward an emitting side of an optic... | 10/18/2011 |
| 8014257 | Extraction optical system and optical head device including the same An object of the present invention is to provide an extraction optical system capable of separating and extracting a signal light and a stray light with a simple configuration, and an optical head device including the same. A phase plate and a phase plate are +λ/4 ... | 09/06/2011 |
| 7986608 | Laminated wave plate and optical pickup device using the same A laminated wave plate of the present invention includes a first wave plate having a phase difference of Γ1 and a second wave plate having a phase difference of Γ2 with respect to a wavelength λ, the first wave plate and the second wave plate being ... | 07/26/2011 |
| 7881174 | Optical pickup apparatus The present invention provides an optical pickup apparatus to for recording and/or reproducing information on an optical information recording medium including multilayered information recording surfaces. The optical pickup apparatus includes: a light source; an obj... | 02/01/2011 |
| 7859977 | Optical pick-up unit An optical pick-up including a fold mirror having an achromatic quarter-wave plate coating is provided. To allow the thin film coating to efficiently provide the quarter-wave retardation, the optical pick-up is configured such that the polarization of light incident... | 12/28/2010 |
| 7839753 | Optical system, optical pickup apparatus, and optical disk apparatus The present invention discloses an optical system for extracting signal light components from a beam including the signal light components and stray light components. The optical system includes a condensing optical element situated on an optical path of the beam fo... | 11/23/2010 |
| 7787348 | Optical head apparatus and optical information recording or reproducing apparatus Light emitted from a light source and having a wavelength of 400 nm is reflected by a beam splitter (BS), and converged on a disk according to a next-generation standard. Reflection light therefrom passes through the BS and is received by a photodetector. Light emit... | 08/31/2010 |
| 7616550 | Optical pickup unit An optical pickup unit is disclosed that comprises a first light-emitting element capable of emitting first-wavelength light; a second light-emitting element capable of emitting second-wavelength light whose wavelength is different from that of the first-wavelength ... | 11/10/2009 |
| 7483357 | Optical pickup and optical disc apparatus An optical pickup housing an optical system including a collimator lens for converting laser light incident on the collimator lens into an approximately parallel light beam, and an objective lens for receiving the laser light converted into the approximately paralle... | 01/27/2009 |
| 7463569 | Optical disk apparatus with a wavelength plate having a two-dimensional array of birefringent regions It is intended to provide an optical disk apparatus which detects a light amount greater than zero even when used in conjunction with an optical disk substrate having a large birefringence, so that it is possible to properly read a signal without errors and properly... | 12/09/2008 |
| 7444047 | Multiplexing optical system A multiplexing optical system includes collimator lenses, a first condensing lens, a second condensing lens and an optical fiber. The collimator lenses collimate divergent laser beams that have been emitted from semiconductor lasers. The first condensing lens conden... | 10/28/2008 |
| 7436561 | Hologram laser unit and optical pickup apparatus A laser light beam of a first wavelength which is polarized in a first polarizing direction, emitted from first and second semiconductor laser elements and reflected by an information recording surface of an optical recording medium, is made to be transmitted by a s... | 10/14/2008 |
| 7417937 | Optical pickup apparatus Astigmatism of a beam of first laser light is cancelled at a position separated from first optical element by a predetermined distance on an optical axis of the beam of first laser light by refracting to transmit the beam of the first laser light by being refracted ... | 08/26/2008 |
| 7417936 | Optical pickup reducing noise and polarization changer An optical pickup includes a laser light source, an objective lens which focuses light emitted from the laser light source on an optical information storing medium, an optical path changer which changes a proceeding path of the light emitted from the laser light sou... | 08/26/2008 |
| 7408867 | Method of aligning an optical fiber, method of manufacturing a semiconductor laser module, and semiconductor laser module A method of aligning an optical fiber according to the present invention has a first step of aligning an optical fiber by moving the optical fiber and finding a position that maximizes the power of beam outputted from the optical fiber with the use of a power meter,... | 08/05/2008 |
| 7403453 | Optical disk apparatus compatible with different types of mediums adapted for different wavelengths 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 ... | 07/22/2008 |
| 7366079 | Optical pickup device and optical disk drive using the same An optical pickup device includes a light source unit an optical system which leads a return light beam to a predetermined light-receiving location and includes an object lens focusing each light beam from the light source unit to a recording surface of a correspond... | 04/29/2008 |
| 7355952 | Liquid crystal device, its driving method, and driving apparatus A liquid crystal device, and a method and an apparatus for driving the same in which the refractive index of the liquid crystal device is adjusted using a simple driving method and apparatus, which is advantageous in that the cost is reduced, are provided. A liquid ... | 04/08/2008 |
| 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 |
| 7352517 | Optical pickup apparatus An optical pickup apparatus for conducting at least recording or reproducing of information on two types of optical information recording media having protective substrates with different thicknesses, includes: a first light source for emitting a first light flux wi... | 04/01/2008 |
| 7338913 | Semiconductor device, manufacturing method thereof, and electronic device A laser annealing method for obtaining a crystalline semiconductor film having a large grain size is provided. Laser light is irradiated to the top surface and the bottom surface of an amorphous semiconductor film when crystallizing the amorphous semiconductor film ... | 03/04/2008 |
| 7336587 | Optical pickup head compatible with multiple optical recording media An optical pickup head compatible with multiple optical recording media includes three light sources, a prism unit disposed beside the light sources, a reflective multi-surface prism disposed beside the prism unit for multiple reflecting light beams therethrough, a ... | 02/26/2008 |
| 7327513 | Method and apparatus for viewing target Apparatus and method for viewing a target. A primary lens produces an image plane of the target, and an optical magnifier in an optical path of the primary lens magnifies a region of the image plane, providing a magnified image. A detector receives the magnified ima... | 02/05/2008 |
| 7324424 | Compatible optical pickup having diffractive device to correct chromatism and divergent lens to increase working distance A compatible optical pickup includes an optical disc, an objective lens, a diffractive device, and a divergent lens. The optical unit emits a short wavelength light beam corresponding to a high density optical disc and a long wavelength light beam corresponding to a... | 01/29/2008 |
| 7321533 | Optical pickup device having a wavelength selecting film and an optical reflector An optical pickup device has first and second light sources that emit first and second laser beams of different wavelengths, an object lens that concentrates the first and second laser beams on a data recording surface of an optical disk, an optical separator dispos... | 01/22/2008 |
| 7315506 | Information recording medium, information recording apparatus, information recording method, information playback apparatus, information playback method, recording program recording medium, and playback program recording medium An optical disk from which information is played back when the optical disk is irradiated with a playback light beam which does not pass through a photochromic layer before its transparency is changed by irradiation with a recording light beam, but passes through th... | 01/01/2008 |
| 7286449 | Optical pickup device An object of the present invention is to provide an optical pickup device with high reliability and reduced thickness, which can form an accurate beam spot without providing a thin film section in a lens holder and without influence of peripheral light of laser beam... | 10/23/2007 |
| 7280459 | Device for correcting signal modulations A device for reading from and/or writing to optical recording media 10, on which information is present in the form of pits, with a linearly polarized light beam 2. A device for reading from and/or writing to optical recording media 10 w... | 10/09/2007 |
| 7262893 | Data read/write device for holographic WORM and method thereof A data writing and reading device is capable of writing and reading data with respect to a holographic storage medium. The data writing and reading device includes a light source which emits a laser beam, a focusing lens unit having a multi-focal lens which splits t... | 08/28/2007 |
| 7230903 | Recording and playback apparatus and optical head including a variable optical coupling efficiency device The light intensity of a light beam emitted from a light source is appropriately controlled when the light beam is transmitted through a variable optical coupling efficiency device in an optical head. During a read mode, the light beam from the light source is incid... | 06/12/2007 |
| 7224521 | Parcentric objective A parcentric objective is described, including an objective lens configured to receive an incident ray from a field of view and to translate the incident ray into a translated incident ray, the objective lens substantially aligned across an optical axis, and a wedge... | 05/29/2007 |
| 7218451 | Integrated optical multiplexer and demultiplexer Optical multiplexers and demultiplexers are provided. In one implementation an apparatus is provided. The apparatus includes a first laser diode pair, a second laser diode pair, a polarization rotator coupled between the first and the second laser diode pairs, and a... | 05/15/2007 |
| 7215628 | Optical information recording apparatus and method using holography It is an object of the invention to allow the use of a practical light source to record information in each information recording area of a recording medium having a plurality of information recording areas through the use of holography while moving the recording me... | 05/08/2007 |
| 7209427 | Optical pickup with reduced size An optical pickup having a light-emitting element, an objective lens unit, a reflecting mirror and a light-receiving element, emits a beam onto an optical recording medium and uses a reflected beam to read recorded information. In the objective lens unit, a central ... | 04/24/2007 |
| 7206275 | Optical pickup device An aberration correction element is disposed between first to third laser light sources and an objective lens, first and second laser lights emitted from the first and second laser light sources are incident upon the aberration correction element in the form of para... | 04/17/2007 |
| 7193954 | Optical pickup device and objective lens for the optical pickup device An optical pickup apparatus includes first, second and third light sources; a light converging optical system including a first objective optical element and a second objective optical element, wherein the first objective optical element converges the light flux emi... | 03/20/2007 |
| 7180845 | Optical pickup An optical pickup having a simple structure and that is capable of recording using a plurality of wavelengths is provided, comprising a primary laser light source for emitting a primary laser light having a first wavelength and that is of sufficient power for record... | 02/20/2007 |
