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| Number | Title | Issue Date |
| 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 |
| 8107347 | Optical disk apparatus, optical pickup, preformatted signal generation method and program There is provided an optical disk apparatus causing a hologram device to diffract a reflected light beam and causes each of reflected light beams of primary light in a longitudinal direction to generate received light signals by receiving the reflected light beams t... | 01/31/2012 |
| 7869331 | Optical head, control method for optical head, and optical information processing apparatus An optical head includes a hologram which extracts, from a luminous flux of reflected light from an optical disk, at least a first luminous flux branch which does not include the optical axis of the luminous flux; and a photodetector which receives the reflected lig... | 01/11/2011 |
| 7567496 | Optical pickup device capable of loosening assembly accuracy In a photo pickup device, a hologram element 13 is divided into eight areas. In operation, the hologram elements adds different lens powers to four diffraction lights forming two pairs of diffraction-light groups. In the photo pickup device, a light receiving... | 07/28/2009 |
| 7453787 | Optical pickup An optical pickup projects laser beams having the first to the third wavelengths, in response to the type of a recording medium which is an object to which recording or reproduction is to be performed, and reflecting light from the recording medium is received by a ... | 11/18/2008 |
| 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 |
| 7359295 | Optical pickup apparatus and optical disk drive apparatus An optical pickup apparatus for reproducing information from an optical disk, includes: a semiconductor laser applying a beam to an optical disk having two recording layers through an objective lens; and a light receiving device to which light reflected from the opt... | 04/15/2008 |
| 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 |
| 7345267 | Optical system having element for correcting aberration of mirror and optical pickup apparatus employing the same An optical system including a light source that generates light, a mirror changing an optical path of the light generated by the light source and an aberration correcting element that corrects aberrations generated in the light reflected from the mirror due to an er... | 03/18/2008 |
| 7345981 | Optical pickup An optical pickup including an optical member which inhibits interference light reflected from an adjacent layer from being received by a photodetector when an optical information storage medium includes a plurality of recording layers on at least one side thereof. ... | 03/18/2008 |
| 7339877 | Optical head device and information processing apparatus In an optical head device, a light emission source for emitting a plurality of laser beams with different wavelengths and an optical system including an objective lens and a collimator are provided. With respect to the optical system to be used in common for a plura... | 03/04/2008 |
| 7330292 | Complex objective lens, optical head, optical information apparatus, computer, optical disk player, car navigation system, optical disk recorder, and optical disk server A complex objective lens composed of a hologram and an objective lens, capable of realizing stable and high-precision compatible reproducing/recording of a BD with a base thickness of about 0.1 mm for a blue light beam (wavelength λ1) and a DVD with a base t... | 02/12/2008 |
| 7317672 | Optical head An optical head includes the following: a light beam separator (35) that includes substantial interference regions for light that is reflected from an information recording medium and travels in a straight path and ±first-order diffracted light produced by i... | 01/08/2008 |
| 7315502 | Light integration unit, optical pickup device using the unit, and optical disk device An object of the present invention is to attain stable tracking servo performance by suppressing an offset caused by a shift of an object lens or a tilt of a disk, despite the one-beam method which does not cause reduction in light quantity of the main beam. A diffr... | 01/01/2008 |
| 7315501 | System and method for recording of information on a holographic recording medium, preferably an optical card The invention relates to a method for the recording and reading of data with a holographic write/read apparatus onto a holographic recording medium with a thin holographic recording layer. The medium is preferably an optical card (2). The recording of the inf... | 01/01/2008 |
| 7307938 | 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... | 12/11/2007 |
| 7304781 | Ultra broadband mirror using subwavelength grating A sub-wavelength grating structure that has a very broad reflection spectrum and very high reflectivity comprising segments made of high refractive index material disposed on a layer of low refractive index material and a low refractive index material disposed above... | 12/04/2007 |
| 7292615 | Semiconductor laser device, method for fabricating the same, and optical disk apparatus A semiconductor laser device (10) includes a resonant cavity (12) in which a quantum well active layer (11) made up of barrier layers of gallium nitride and well layers of indium gallium nitride is vertically sandwiched between at least light gu... | 11/06/2007 |
| 7283440 | Tracking error signal detecting method selectively using a push-pull method, an improved push-pull method, and a three beam method and optical recording/reproducing apparatus using the same An optical recording/reproducing apparatus includes an optical pickup and a signal processor. The optical pickup includes an optical splitting device which splits light emitted from a first light source into a main light beam and sub-light beams which are symmetrica... | 10/16/2007 |
| 7257828 | Optical head device An optical head device includes a base member having an attachment surface passing a laser beam of light reflected by an optical disk, a block in the form of a wedge having an attachment surface adjacent to that of the base member and an attachment surface opposite ... | 08/14/2007 |
| 7247826 | Optical pickup apparatus An optical path coupling member aligns an optical axis directed to a light condensing member of the first wavelength light having a shortest wavelength with that of the third wavelength light having a longest wavelength. A diffraction element condenses +2nd order di... | 07/24/2007 |
| 7245407 | Complex objective lens compatible with information media of different thicknesses A complex objective lens composed of a hologram and an objective lens, capable of realizing stable and high-precision compatible reproducing/recording of a BD with a base thickness of about 0.1 mm for a blue light beam (wavelength λ1) and a DVD with a base t... | 07/17/2007 |
| 7230905 | Optical pickup using two-wavelength light source module and method for correcting position difference An optical pickup includes a light source module in which first and second light sources that emit first and second light beams of different wavelengths are integrated into a single package, an objective lens that focuses the first and second light beams to form a l... | 06/12/2007 |
| 7227827 | Optical information recording apparatus, optical information reproducing apparatus, optical information recording/reproducing apparatus, and optical information recording medium An object of the present invention is to make it possible to record information on an optical information recording medium in the form of three dimensional interference patterns so that the information is erasable in part. The optical information recording me... | 06/05/2007 |
| 7206106 | Holographic ROM reader having servo control A holographic ROM reader having a servo control is disclosed. The holographic ROM reader includes an objective lens for focusing light reflected from a storage medium, a pinhole plate provided with a pinhole, a diffraction grating, embedded into the pinhole of the p... | 04/17/2007 |
| 7180844 | Holographic disc recording system A holographic disc recording system for recording, in the form of holograms, information stored on a source disc onto a target disc includes a conical beam shaper which transforms a reference beam into a conical beam having a substantially cylindrically symmetrical ... | 02/20/2007 |
| 7180668 | Optical pickup device and optical disc device This invention is an optical pickup device having a composite optical element (32) which has a first diffraction grating (45) for splitting a light beam emitted from a light source (31) into zeroth-order light, plus-first-order light and minus-f... | 02/20/2007 |
| 7180838 | Optical pickup apparatus with single light source module An optical pickup apparatus includes a light source module which emits a light beam, a beam splitter which reflects or transmits the light beam emitted from the light source module, an objective lens which focuses the light beam passing through the beam splitter ont... | 02/20/2007 |
| 7175087 | Method of analyzing astigmatic difference and method of correcting the spot diameters for an optical device and spot analysis system A method of analyzing the astigmatic difference of an optical device for analyzing the astigmatism inherent to the optical device by utilizing a condensation performance analysis system while correcting the astigmatic difference inherent to the condensation performa... | 02/13/2007 |
| 7177242 | Condenser with first and second photodetectors with three sections each and having focal points before and after the surface of detectors To provide a light receiving device, a light detecting device, and an optical signal reproducing device each of which allows one to perform many different computations in detecting aberration amounts and focus error quantities without requiring exact position relati... | 02/13/2007 |
| 7158454 | Optical device The present invention relates to an optical device which includes a first laser diode, a beam splitter, a first objective lens, a photo-detector, a second laser diode, a wedged plate beam splitter, a second objective lens and a collimator. The present invention depl... | 01/02/2007 |
| 7139234 | Optical pickup An optical pickup is provided for recording and reproduction of information onto and from an optical disk. In the optical disk, in a forward optical path, a single polarized optical beam is converted to plural polarized optical beams. Polarization modes of the plura... | 11/21/2006 |
| 7136409 | Semiconductor laser device and optical pickup device In this semiconductor laser device, a polarization hologram transmits an outgoing beam directed from a semiconductor laser chip to an optical disk as a forward beam without diffracting the beam, and diffracts a backward beam of the laser beam, which is a return beam... | 11/14/2006 |
| 7113472 | Optical head including an active polymer film for switching voltage during recording and reproducing processes An optical head for recording or reproducing a signal with respect to an optical recording medium, which includes an optical element disposed between a light source and an optical recording medium. The optical element has an optically active polymer film in which an... | 09/26/2006 |
| 7106681 | Optical head arrangements with single substrate lasers An optical head with a plurality of semi-conductor laser chips for use in reducing inclination or gradient of more than one beam presently falling onto a focusing lens is disclosed. To this end, a double mirror or alternatively beam reshaping means is disposed which... | 09/12/2006 |
| 7106682 | Optical pickup An optical pickup can be provided, the optical pickup being capable of recording and playback of a plurality of optical disks having different specs by using light beams of different wavelengths, and further being suitable for integrating the semiconductor lasers an... | 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 |
| 7092344 | Apparatus for creating a multi-dimensional data signal An optical disk drive (101) is disclosed which has essentially no seek time. The drive utilizes a Virtual Head (VH) (103) which is capable of accessing any and/or all tracks in an optical disk (111) at any time. The drive utilizes a procedure by... | 08/15/2006 |
| 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 |
| 7075865 | Optical pickup An optical pickup includes a semiconductor laser for emitting light at a wavelength λ1 and a semiconductor laser for emitting light at a different wavelength λ2 from the wavelength λ1. The light at the wavelength λ1 transmitted throug... | 07/11/2006 |
