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| Number | Title | Issue Date |
| 8040760 | Polarization near-field transducer having optical conductive blades In a particular embodiment, an optical transducer includes at least three optically conductive blades arranged symmetrically about a center gap. The optical transducer is adapted to receive polarized light from a light source and to focus the polarized light onto a ... | 10/18/2011 |
| 7313056 | Magneto-optical recording medium and magneto-optical recording device The magneto-optical recording medium is comprised of a phase pit substrate/dielectric layer/recording layers/dielectric layer/reflection layer and a ROM and RAM can be simultaneously regenerated. The shape of the phase pit is constructed to be 5 | 12/25/2007 |
| 7291829 | Light intensity detector A polarization separating element such as a beam splitter receives a first light of a first polarization plane. The polarization separating element derives out of the first light a second light of a second polarization plane set perpendicular to the first polarizati... | 11/06/2007 |
| 7266074 | Optical disc apparatus and method of reproducing a wobble signal An optical disc apparatus and a wobble signal detection method in which a light beam projected onto an optical disc and reflected by the optical disc is divided into at least four light regions in the direction corresponding to the radial direction of the optical di... | 09/04/2007 |
| 7251076 | Optical component and method for producing thick polyimide film An optical component according to the present invention comprises a substrate, and at least one optical element obtained by processing at least one thick optical film provided on the substrate. The optical component has a plurality of surfaces substantially not para... | 07/31/2007 |
| 7230902 | Optical pickup device, recording and reproducing apparatus and gap detection method An optical pickup device and an optical recording and reproducing apparatus are suitable for use with a near-field optical recording and reproducing system. An optical pickup device comprises an objective lens composed of a solid immersion lens (SIL), the objective ... | 06/12/2007 |
| 7177491 | Fiber-based optical low coherence tomography Generally, and in one form of the present invention, is a polarization-maintaining fiber-based polarization sensitive optical low coherence reflectometer for depth resolved birefringence measurement. With the present invention, linear birefringence of a sample may b... | 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 |
| 7177236 | Optical disc head including a bowtie grating antenna and slider for optical focusing, and method for making A slider system have been developed to aid in the spacing between read/write heads and the storage medium, and a grating antenna amplifier has been developed to improve illumination spot size and polarization characteristics. The grating antenna can be attached to a... | 02/13/2007 |
| 7130120 | Prism, projection and optical component An apparatus for transmitting or reflecting incident light. The apparatus includes a pair of diffraction grid substrates; a substantially grid-shaped diffraction grid formed of metal, wherein the diffraction grid is disposed between the substrates; and a pair of adh... | 10/31/2006 |
| 7110327 | Magneto-optical recording and reproducing method, using reproducing layer with high saturation magnetization A magnetic recording medium comprises, on a substrate, a recording auxiliary layer, a recording holding layer, recording control layer, and a recording layer. The recording layer is constructed by using a ferri-magnetic material having perpendicular magnetization. T... | 09/19/2006 |
| 7110335 | Recording and reproducing method for optical recording medium and optical recording medium A write-once type optical recording medium is provided, which is low-cost and capable of maintaining the recording and reproducing stability high while enabling the relative ratio of read power to write power to be set high. The high-speed write-once type opt... | 09/19/2006 |
| 7078674 | Optical pickup device emitting linear polarized light with a 45 degree phase difference 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... | 07/18/2006 |
| 7027385 | Optical disk, disk substrate, and drive An optical disk 100 is provided with a hub 3 at the central portion of a substratel. A relationship Y/X≧0.015, preferably Y/X≧0.05 is satisfied where X is the projected area of the substrate 1 and Y is a contact area between the hub 3... | 04/11/2006 |
| 7009929 | Optical pickup, including a mirror for changing light polarization direction, and information reproducing apparatus having the same The optical pickup reads an information signal by emitting a light beam to an information recording surface of a recording medium having a recording track composed of information pits arranged for recording the information signal. The optical pickup is provided with... | 03/07/2006 |
| 7002892 | Optical pickup reproducing apparatus having reading compatibility among recording media with respective recording densities different from one another A liquid crystal element is provided as a polarization plane rotating device between a laser beam source and a beam splitter. Light emitted from the laser beam source passes through the liquid crystal element and the beam splitter, and is converted into parallel lig... | 02/21/2006 |
| 6980975 | Method and apparatus for rule-based random irritator for model stimulus For testing a logic unit under test (UUT), rule-based random irritation of a UUT model is provided to be used in conjunction with a simulator. The UUT model is stimulated (or irritated) with data patterns randomly generated by a pattern generator within the boundary... | 12/27/2005 |
| 6944102 | Magneto-optical reader which is optimized by the incident-light polariser A magnetooptic read device in which the figure of merit is optimized mainly by the setting of the incident light polarizer. The component of the incident wave pumps the magnetooptic transducer. The component of the incident wave amplifies the variations in the magne... | 09/13/2005 |
| 6928033 | Magneto-optical recording medium having a plurality of heat-radiation films A magneto-optical recording medium includes a heat-radiation film and a magnetic film exhibiting magnetic anisotropy in a direction vertical to a surface of the magnetic film. The heat-radiation film is formed between a substrate and the magnetic film and is formed ... | 08/09/2005 |
| 6650615 | Optical recording medium and recording and/or reproducing method and apparatus employing the optical recording medium An optical recording medium is capable of linear recording in a photon mode. An organic material changed in molecular orientation on light illumination to exhibit birefringence is used as a recording material. For example, a recording layer having, as a r... | 11/18/2003 |
| 6243326 | Recording and reproduction device for a magneto-optic recording medium capable of recording information according to optical super-resolution A magneto-optic disk and a recording/reproduction device therefor adopt optical super-resolution to increase recording capacity. More specifically, the magneto-optic disk has an heat emitting layer (6) on a recording layer (4) and still preferably has an ... | 06/05/2001 |
| 5966347 | Apparatus and method for reproducing data from a magneto-optic recording medium A data reproducing device and method for reproducing data recorded on a magneto-optic recording medium having at least a recording layer and a reproducing layer. The device and method include a beam directing unit for directing a pulsed laser beam having ... | 10/12/1999 |
| 5907525 | Magneto-optical disk, optical pickup, and magneto-optical disk drive A magneto-optical disk including a transparent substrate, pit strings containing information formed in spiral or concentric form on a surface of the transparent substrate, a magneto-optical recording medium layer for covering the surface of the transparen... | 05/25/1999 |
| 5796683 | Magneto-optical recording device having a controllable polarizing filter An information recording and reproduction apparatus for a magnetically induced superresolution magneto-optical recording medium includes an optical head that emits a laser beam to a signal recording plane of the medium and detecting a laser beam reflected... | 08/18/1998 |
| 5777974 | Optical head and magneto-optical reproducing apparatus using the same In an optical head for radiating a light spot on a magneto-optical recording medium and detecting light received via the medium, there are provided a light source, a condenser lens for condensing light from the light source, a photodetector, and a deflect... | 07/07/1998 |
| 5712840 | Optical information recording/reproduciing apparatus having two-division detectors An optical information recording/reproducing apparatus is disclosed. In the apparatus, a light beam polarized in a predetermined direction is irradiated onto an opto-magnetic recording medium to which a pre-determined magnetic field is applied. The light ... | 01/27/1998 |
| 5708645 | Semiconductor laser device to detect a divided reflected light beam An optical device for detecting a magneto-optical signal can be simplified and miniaturized in arrangement. An optical device for detecting a magneto-optical signal includes an optical element in which a light-emitting portion and a light receiving portio... | 01/13/1998 |
| 5671206 | Optical pickup device An optical pickup device for recording/reproducing an optical disc having at least two data storing layers on one side thereof generates a first and second laser beams of same polarization (S-polarized beams) from a first and second laser beam sources. Th... | 09/23/1997 |
| 5661701 | Optical pickup using split beams impinging on different photodetector areas Optical pickup apparatus using split beams impinging on different photo-detector areas includes optical structure for projecting a light beam polarized in a predetermined direction toward a recording medium where information is recorded. Optical separatin... | 08/26/1997 |
| 5652745 | Optical system using polarized light with prevention of effect of birefringence An optical system using polarized light is provided wherein a polarized light beam from an optical source is made to coincide with the natural polarization of the optical element acting upon the light beam. The polarization of the light beam from the opti... | 07/29/1997 |
| 5625725 | Magneto-optical pickup device having phase compensating circuitry Even when manufacturing of a waveguide is fluctuated and an optical parameter is fluctuated or a wavelength of emitted light is fluctuated, a phase difference between two intrinsic modes can be compensated (positive integral multiple of π). Thus, it is p... | 04/29/1997 |
| 5615181 | Optical read/write head with low angle beam splitter and coplanar detectors An optical read/write head for a magnetic-optic recording and reproducing unit having a beam splitter placed between a collimator lens and an objective lens. The optical path of the beam reflected by a recording disk is bent by the beam splitter and the b... | 03/25/1997 |
| 5577017 | Magnetooptical information recording/reproducing apparatus An optical information recording and/or reproducing apparatus includes an irradiating device for irradiating light polarized in a predetermined direction onto a magnetooptical recording medium having a plurality of tracks, the irradiating device includes ... | 11/19/1996 |
| 5561655 | Apparatus and method for differential tracking in a magneto-optic data storage system using mark edge detection An apparatus and method for providing a tracking error signal in an optical system in which a radiation beam is applied to an optical storage medium having a number of marks formed thereon. A return beam resulting from application of the incident radiatio... | 10/01/1996 |
| 5519675 | Polarization detector optical head An optical head comprising of a laser source, a collimating lens, a focusing lens, a beam splitter, two polarizers, a quarter wave retarder, three detector lenses, and three photo detectors can be used to detect the polarization change of reflected light ... | 05/21/1996 |
| 5511060 | Magneto-optical head with a three prism beam splitter to split a reflected beam into three beams An optical system of reflected light path of a magneto-optical head, comprising very few parts that can be easily manufactured and assembled at a low cost. The present invention makes use of a beam splitter and a plane convex lens to simplify the optical ... | 04/23/1996 |
| 5488592 | Optical pickup device for magneto-optical disc reproducing system An optical pickup device having a simple structure due to many less components is disclosed. A laser beam generated in a laser diode is transformed into a parallel laser beam. The laser beam is irradiated onto a polarization beam splitter including a pris... | 01/30/1996 |
| 5471440 | Magnetooptic apparatus with integrated detecting element providing signal with high S/N ratio In an apparatus for recording and reading out magnetooptic information an incident light beam polarized in a predetermined direction is modulated by rotating a plane of polarization in accordance with a recording pattern of a magnetooptic information reco... | 11/28/1995 |
| 5467336 | Magneto-optical recording/reproducing apparatus with optical pickup device having a multi-layer dielectric film beam splitter An optical pickup device for an information recording and/or reproducing apparatus in which fluctuations in polarization film characteristics due to the variable incident angles of the light beam to the beam splitter may be reduced to prevent C/N characte... | 11/14/1995 |
| 5416755 | Optical pickup using split beams impinging on different photo-detector areas An optical pickup device for producing information magnetically recorded on a recording medium includes a light source for generating a light beam polarized in a predetermined direction. An object lens is provided for focusing the light beam generated fro... | 05/16/1995 |
