Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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| Number | Title | Issue Date |
| 7889616 | Polarization state detector systems and methods for read-out of multilevel oriented nano-structure optical media A polarization detection system structured for optical read-out of disc-shaped optical data/information storage and retrieval media with surfaces comprised of pits or marks configured as multilevel oriented nano-structures (ONS) with varying pit or mark orientations... | 02/15/2011 |
| 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 |
| 7251200 | Apparatus for reproducing information data from magneto-optical recording medium using linear polarized beam An apparatus is provided for reproducing optical disks. An optical head irradiates linearly polarized light onto an optical disk. A change of a polarization orientation of light that is transmitted or reflected from the optical disk is detected in accordance with a ... | 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 |
| 7230747 | Hologram retention method Information recorded as a hologram in a predetermined position of an optical recording medium is reproduced, and subsequently the reproduced information is re-recorded and retained in the same position as the predetermined position as a hologram. Alternatively, info... | 06/12/2007 |
| 7200096 | Method and apparatus for the modulation of multilevel data arrays A method and apparatus for modulating multilevel data arrays to make them suitable for storage in multidimensional storage media, such as in holographic storage. In order to get a uniform signal of constant energy at the recording plane, first the multilevel data ar... | 04/03/2007 |
| 7193963 | Method for inputting information into a data storage medium that is optically recordable and readable In a method of entering information into an optically writable and readable data storage medium having a polymer film which can be changed locally by heating in order to store information and to which there is assigned an absorber dye (34) which is set up to ... | 03/20/2007 |
| 7158273 | Holographic data memory A holographic data storage medium has a polymer film which is set up as a storage layer whose refractive index can be changed locally by heating. The polymer film is set up for the storage of optical phase information via the local optical path length of the polymer... | 01/02/2007 |
| 7154646 | Optical recording apparatus and optical recording/reproducing apparatus An optical recording/reproducing apparatus having excellent resistance against vibration and noise. In recording, coherent light is polarization-modulated with a spatial light modulator to generate signal light and reference light whose polarization directions are c... | 12/26/2006 |
| 7148468 | Mirror angle measurement and servo control apparatus for holographic digital data storage system A mirror angle measurement and a servo control apparatus for a Holographic Digital Data Storage (HDDS) system is disclosed. The mirror angle measurement apparatus includes a first mirror having a first reflecting surface by which the reference beam is reflected towa... | 12/12/2006 |
| 7126883 | Optical information reproducing method, optical head device, and optical information processor An optical information reproducing method of the present invention is used for an optical recording medium. The optical recording medium includes a recording layer containing information and a mask layer that is located close to the recording layer and includes a no... | 10/24/2006 |
| 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 |
| 7081613 | Retroreflective photoelectric sensor A retroreflective photoelectric sensor has a light-emitting optical system having a light-emitting element and a first polarizer and serving to transmit light from the light-emitting element through the first polarizer, a light-receiving optical system having a seco... | 07/25/2006 |
| 7054253 | Optical head An optical head device including a phase correcting element having an anisotropic optical medium sandwiched between a pair of substrates. The paired substrates have surfaces provided with electrodes for voltage application to the anisotropic optical medium. One elec... | 05/30/2006 |
| 7027376 | Method for optical data recording and reproducing The invention concerns a method for optical recording of data on a photosensitive storage medium, characterized in that the data are encoded according to different possible states for the various components of a non-linear susceptibility tensor of the photosensitive... | 04/11/2006 |
| 7023786 | Hologram recording and reproducing apparatus A hologram recording and reproducing apparatus preforms to record data on a recording medium and reproduce data from the recording medium. The recording medium is made of a photorefractive crystal having a parallel plate shape. The apparatus includes: a support port... | 04/04/2006 |
| 7002891 | Apparatus and method for recording and reproducing information to and from an optical storage medium Holographic recording and reproducing using a compact configuration provides no reduction in the recording/reproducing capability. Information light and recording-specific reference light having a spatially modulated phase are generated and projected onto an optical... | 02/21/2006 |
| 6940801 | Optical recording medium, optical recording and reproducing method and apparatus An optical recording medium, an optical recording and reproducing method, and an apparatus that can record and reproduce multilevel information at a high density and with a high S/N ratio. Recording light emitted from a light source is collimated by a collimation le... | 09/06/2005 |
| 6914234 | Optical encoder and scale for encoder Laser light output from a laser light source is irradiated onto a transmission-type scale. Due to movement of the transmission-type scale, a polarization angle of transmitted light varies in accordance with variations in orientations of half-wave plates arrayed in a... | 07/05/2005 |
| 6845076 | Optical recording medium and optical recording method A light orientation film and a liquid crystal thin film are formed adjacent to each other. Light is irradiated to the light orientation film and the liquid crystal thin film, so as to cause the light orientation film to be orientated while viscosity of the liquid cr... | 01/18/2005 |
| 6700855 | Optical disk device A light emitted from a light source (11) or a return light from a magneto-optical discs (7a, 7b, 7c or 7d) is transmitted by a polarization maintaining optical fibers (15a, 15b, 15c or 15d). Phase difference generators (16a, 16b, 16c and 16d) are disposed... | 03/02/2004 |
| 6584046 | Method for reproducing information data from magneto-optical recording medium using linear polarized beam A method for reproducing write-once information from an optical disk. The disk includes a disk substrate and a recording layer on the disk substrate, the recording layer including a magnetic film with a magnetic anisotropy in a direction perpendicular to ... | 06/24/2003 |
| 6512733 | Optical recording method, optical recording apparatus, optical reading method, and optical reading apparatus The present invention provides an optical recording method, optical recording apparatus, optical reading method, and optical reading apparatus which are capable of high density recording an d high speed recording, and high speed reading. In recording, a r... | 01/28/2003 |
| 6496896 | Transmission apparatus, recording apparatus, transmission and reception apparatus, transmission method, recording method and transmission and reception method The invention provides a transmission apparatus, a recording apparatus, a transmission and reception apparatus, a transmission method, a recording method and a transmission and reception method by which data can be communicated between different apparatus... | 12/17/2002 |
| 6452890 | Optical storage medium, optical storage method, optical reading method, optical reading apparatus, optical retrieving method and optical retrieving apparatus An optical storage medium of the present invention enables storage of data with high precision at high speed, and rewriting of data at high speed without an erasing process. Optical storage, reading and retrieving methods and optical storage, reading, and... | 09/17/2002 |
| 6370104 | DVD reading-writing pick-up head employing multiple wavelengths This invention relates to a DVD reading-writing pickup head employing multiple wavelengths for data access on an optical record medium. With the configuration of the pickup head of the present invention, the number of the used optical elements is minimize... | 04/09/2002 |
| 6349082 | Optical disc apparatus Disclosed is an optical disc apparatus compatible with both ROM type and RAM type optical discs having high density and large capacity. An optical disc apparatus includes: a disc control device including an optical disc (a magneto-optical disc), a spindle... | 02/19/2002 |
| 6343059 | Reading-writing pickup head This invention concerns a reading-writing pickup head for data access on optical record media. The pickup head of the present invention includes a birefringent prism and a quarter-wave plate where the birefringent prism is made of double-refraction materi... | 01/29/2002 |
| 6341116 | Compact optical pick-up head employing non-diffractive element A compact optical pickup head which doesn't utilize a holographic optical element is disclosed. A birefringent prism and a quarter-wave plate are disposed in the optical path of the compact pickup head. The birefringent prism is consisted of two crystals ... | 01/22/2002 |
| 6266313 | Optical pickup for recording or reproducing system A light source is provided for emitting a first beam having a far-field pattern of an elliptic shape. The first beam is a linearly polarized light having a first polarizing direction in a major axis of the elliptic shape. A half-wave plate is provided for... | 07/24/2001 |
| 5917799 | Method of reading data of magneto-optical recording medium which includes a guide groove portion having land and groove areas In a magneto-optical recording medium which includes a guide groove portion having a land area, a groove area, and a boundary area between the land area and the groove area, both of the land area and the groove area may have a V-shaped cross-section. At l... | 06/29/1999 |
| 5751677 | Magnetio optical disk recording device capable of verifying recorded state during recording and checking erased state during erasing The magneto-optical disk recording device disclosed is for recording and reproduction using a one-beam optical head and includes a magneto-optical head, a reproduction amplifier, a recording data delay circuit, a recording state detection circuit, a data ... | 05/12/1998 |
| 5726964 | Scanning head including a magneto-optical element and scanning device including the scanning head Scanning head including a magneto-optical element and scanning device including the scanning head. A scanning head having a head face (1) comprises flux-guiding elements (3a, 3b) and a magneto-optical element (5). The magneto-optical element is disposed i... | 03/10/1998 |
| 5701287 | Optical head with a plural layers coated beam splitter for light components separation An optical head comprising an object lens by which a light beam from a light source is projected so as to converge onto said magneto-optical recording medium, a beam splitter disposed along an optical path between the light source and the object lens, for... | 12/23/1997 |
| 5694384 | Method and system for measuring Kerr rotation of magneto-optical medium First and second linearly polarized beams of light are incident on a magneto-optical disc at a common point. Both beams have equal or nearly equal intensity. Upon specular reflection from the disc, the first and second reflected beams travel through analy... | 12/02/1997 |
| 5577016 | Recording medium having concavo-convex pits with a maximum and a minimum pit depth depending on the wavelength of a laser light The information recording and reproducing apparatus includes: a recording medium including a plurality of concavo-convex pits; a light source for emitting laser light; a section for changing an optical characteristic value of the laser light, using intera... | 11/19/1996 |
| 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 |
| 5559769 | Recording/reproducing apparatus for both read-only and magneto-optical disc-shaped recording medium A recording and/or reproducing apparatus for a disc-shaped optical recording medium includes a rotation drive mechanism, a head device, a discriminating device, a first processing device, a second processing device, a third processing device and a control... | 09/24/1996 |
| 5555538 | Optical pickup An optical pickup includes: a laser diode for emitting p-polarized light, the laser diode having unit for controlling output power of the p-polarized light by detecting power of the emitted light in front thereof; a photodetector for receiving a laser lig... | 09/10/1996 |
| 5497361 | Information reproducing apparatus with a DC level correcting capability An information reproducing apparatus is capable of stably and correctly binarizing a signal reproduced from a recording medium, such as an optical disk, even if the reproduced signal contains a fluctuation of its low frequency component. The reproduced si... | 03/05/1996 |
