Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7525880 | Near-field information reproducing apparatus and near-field information reproducing method An information reproducing apparatus has a light source for generating linearly polarized light, a medium having linear marks disposed in overlapping relation to one another, and an optical head disposed between the light source and the medium and having a fine aper... | 04/28/2009 |
| 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 |
| 7123567 | Recording technique with particular bit-distance control in the synchronization pattern Disclosed is a disk-like recording medium, a disk recording apparatus and a disk recording method, and a disk playback apparatus and a disk playback method. Disk ID is recorded over a circle of a burst cutting area on an optical disk. The circle is divided into n bl... | 10/17/2006 |
| 7088823 | System and method for secure distribution and evaluation of compressed digital information A method for controlling access to digital information is performed based on a plurality of decryption keys sent by the information provider. A first type of decryption key instructs a user's host system to reproduce the digital information in accordance with a firs... | 08/08/2006 |
| 7027383 | Optical data storage medium and methods for reading and writing such a medium An optical data storage medium (1) is described. The medium (1) has an optically readable information layer with a first optical reflectivity. An annular zone (12), outside the user data recording area (2) has at least one first type (... | 04/11/2006 |
| 7020061 | Device and method for preventing excess current flowing into pick-up head of optical storage device A method for detecting a current through a pick-up head in an optical storage device. An output value is first set and a root-mean-square value corresponding to the current is further obtained. Next, compute a new value according to the root-mean-square value and a ... | 03/28/2006 |
| 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 |
| 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 |
| 6081499 | Magneto-optical data storage system having an optical-processing flying head A magneto-optical (MO) data storage system has a flying optical head supported over a MO storage medium, the flying head having channels or grooves formed therein and optical elements disposed within the grooves for directing an incident light beam to the... | 06/27/2000 |
| 5740147 | Phase compensation of optical elements by tilting a half wave plate in a magneto-optic disk head A laser beam emitted from a laser diode passes through a first polarization beam splitter to form a spot on a magnetic film of a magneto-optic disk. The plane of polarization of the laser beam reflected at the magneto-optic disk rotates, due to the Kerr e... | 04/14/1998 |
| 5719830 | High-density magneto-optical disk apparatus A high-density magneto-optical disk apparatus is provided for removing a cross talk between signals of an adjacent track with respect to a track to be reproduced during reproduction of a signal recorded on a magneto-optical disk. In the case that a track ... | 02/17/1998 |
| 5581532 | Optical information recording/reproducing apparatus for accurately detecting magnetic domain edges An apparatus for recording and reproducing information on and from optical or opto-magnetic information recording media is disclosed. The apparatus comprises an irradiation device for irradiating a light beam polarized in a predetermined direction to an o... | 12/03/1996 |
| 5432760 | Method of measuring phase difference of opto-magnetic record medium and apparatus for carrying out said method In order to measure a phase difference of an opto-magnetic disk having a substrate and a magnetic record layer, linearly polarized light is made incident upon the magnetic layer of the disk from the side of the substrate and light reflected by the disk is... | 07/11/1995 |
| 5422866 | Magneto-optical head with birefringent polarizer An magneto-optical head that detects information recorded magneto-optically in accordance with changes in polarization conditions of light reflected from a magneto-optical recording medium on which convergent light is projected, includes a birefringent po... | 06/06/1995 |
| 5410531 | Noise reduction in a multiplex recorded optical information system A method of reproducing information recorded on an optical recording medium includes the steps of directing a first reading optical beam and a second reading optical beam onto a recording portion on the optical recording medium to obtain a first electric ... | 04/25/1995 |
| 5349576 | Apparatus and method for polarization switching of a readout beam in a magneto-optic storage system Apparatus and method for determining an orientation of magnetic domains currently being irradiated by a laser having two orthogonal linearly polarized modes of operation is described. The orientation of the currently irradiated magnetic domains determines... | 09/20/1994 |
| 5235570 | Magneto-optic readout method and apparatus using polarization switching of readout beam A method and apparatus for recovering information prerecorded in a vertically magnetized magneto-optic recording element wherein a laser is operated in a state of polarization instability (i.e., its TE and TM losses are equal). The linearly polarized (TE ... | 08/10/1993 |
| 5202860 | Magneto-optic reproducing device using right and left circularly polarized light A reproducing optical device for a magneto-optical recording medium related to the present invention having light sources that emit linearly polarized lights towards a magneto-optical recording medium, polarization directions of the linearly polarized lig... | 04/13/1993 |
| 5189651 | Optical system in magneto-optical recording and reproducing device A magneto-optical reproducing device in which a reflected light signal from a magneto-optical disk is divided by an astigmatic analyzer. The analyzer both divides the light signal according to linear polarization, for data signal detection, but also intro... | 02/23/1993 |
| 5153860 | Optical pickup apparatus for detecting and correcting focusing and tracking errors in detected recorded signals A pickup apparatus for a magneto-optical recording medium comprises a waveguide for receiving a light beam reflected by a magneto-optical recording medium, and first and second focusing grating couplers disposed side by side on the waveguide for introduci... | 10/06/1992 |
| 5099470 | Apparatus for reproducing information from opto-magnetic record medium In an apparatus for reproducing information recorded in an opto-magnetic record medium, a linearly polarized light beam is made incident upon the record medium, a light beam reflected by the record medium is made incident upon a quarter wavelength plate w... | 03/24/1992 |
| 4993012 | Record face identifying device for magneto-optic record medium A magneto-optic record signal processing system uses a linearly polarized light beam to be projected onto a magneto-optic medium and a recorded signal is reproduced by analyzing the polarized conditions of a reflected light beam from the medium. This proc... | 02/12/1991 |
| 4945527 | Optical pickup apparatus for detection of focusing error, tracking error, and information An optical pickup apparatus comprises an objective lens for converging a light beam onto an optical recording medium, and a light guide disposed so that the surface thereof receives the light beam reflected by the optical recording medium. A focusing grat... | 07/31/1990 |
| 4868803 | Magneto-optic pickup head including tracking and focusing error correction A pickup apparatus for a magneto-optical recording medium comprises the first and second waveguides lying one upon the other for receiving a light beam reflected by a magneto-optical recording medium, and first and second focusing grating couplers dispose... | 09/19/1989 |
| 4853923 | Maneto-optical recording apparatus with path length compensated dual photo-electric conversion An optical pickup apparatus comprises two photodetectors disposed on one and the same substrate. The light beam from the recording medium is divided into two light components by an optical member and the two light components are guided to the two photodet... | 08/01/1989 |
| 4682311 | Photomagnetic differential reproducing system A linearly polarized light is projected upon a recording medium of a photomagnetic type; the reflected light is rotated by an appropriate angle through a halfwave plate and split into a reflected light and a transmitted light through a beam splitter havin... | 07/21/1987 |
| 4672593 | Optical head with improved extinction ratio for magneto-optical memory An optical head for a magneto-optical memory in which the major axis (the phase advance axis or phase lag axis) of optical anisotropy of a lens focusing a linearly polarized laser beam onto a magneto-optical recording medium is arranged to coincide with t... | 06/09/1987 |
| 4633338 | Magneto-optical recording and reproducing apparatus having a magnetization direction detecting apparatus for a magnetic recording medium In a magneto-optical recording and reproducing apparatus using a magnetic recording medium having a perpendicular magnetization layer, a magnetization direction detecting apparatus for detecting the magnetization direction of its perpendicular magnetizati... | 12/30/1986 |
