Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7351651 | Structure and method for contact pads having a recessed bondable metal plug over of copper-metallized integrated circuits A metal structure for an integrated circuit, which has copper interconnecting metallization (311) protected by an overcoat layer (320). A portion of the metallization is exposed in a window (301) opened through the thickness of the overcoat laye... | 04/01/2008 |
| 7317675 | Method of manufacturing optical head An integrated unit in which a light source and a light emitting diode are combined into one component is fixed to an optical bench. Then, relative position adjustment of an objective lens actuator is carried out with respect to the optical bench so that a desired de... | 01/08/2008 |
| 7233547 | Disc-shaped recording medium, manufacturing method thereof, and disc drive device A magneto-optical disk which reproduces information with an optical pickup head which uses an electromagnetic force as the driving force is provided. Other areas than at least the recording track are magnetized uniformly in a direction of canceling the influence of ... | 06/19/2007 |
| 7224644 | Head arrangement for domain expansion magnetic amplifying magneto-optical system A head arrangement for reading a magneto-optical recording medium (10) having a storage layer and a read-out layer, includes an improved field generating device for generating a magnetic field used for copying a written mark from said storage layer to said re... | 05/29/2007 |
| 7209411 | Method of manufacturing optical head An integrated unit in which a light source and a light emitting diode are combined into one component is fixed to an optical bench. Then, relative position adjustment of an objective lens actuator is carried out with respect to the optical bench so that a desired de... | 04/24/2007 |
| 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 |
| 7082081 | Reproducing information data from a storage medium using first and second laser of different wavelengths A method of reading out data from a domain expansion data storage such as a MAMMOS magneto-optic disk (1) which includes a data storage layer in which data is stored in the form of magnetic marks, and an expansion layer capable of copying and expanding domain... | 07/25/2006 |
| 6683823 | Method for reproducing information on a recording medium A method for reproducing information on a recording medium includes irradiating electromagnetic energy or light to the recording medium from one side with respect to the recording medium, applying a recording magnetic field to an electromagnetic energy or... | 01/27/2004 |
| 6678219 | Magneto-optical recording medium having a magnetic flux formed layer Featured is a magneto-optical storage medium including: a first magnetic layer constituted by a perpendicularly magnetized film; a second magnetic layer constituted by a perpendicularly magnetized film so as to be exchange coupled to the first magnetic la... | 01/13/2004 |
| 6560168 | Information recording/reproducing device An information recording apparatus using a recording medium which holds information by reversed magnetic domains on a perpendicular magnetic recording film includes an irradiation unit for applying electromagnetic energy or light onto the recording medium... | 05/06/2003 |
| 6483783 | Magneto-optical disk apparatus capable of accurately enlarging and reproducing a magnetic domain and method of reproducing the same A magnetic head is configured of a core and a coil wound around the core and passing current through the coil in a variable direction allows the core to have an edge generating an alternating magnetic field Hex1 and another edge generating an alternating ... | 11/19/2002 |
| 6477118 | METHOD AND APPARATUS FOR RECORDING AND REPRODUCING INFORMATION BY APPLYING FIELD IN A DIRECTION OTHER THAN THE DIRECTION OF MAGNETIZATION OR THE DIRECTION TO A SURFACE OF AN INFORMATION RECORDING MEDIUM Disclosed are a reproducing method and a reproducing apparatus capable of performing reproduction with a wide power margin, as well as a recording method and a recording apparatus preferably used for super high density recording. A recording and reproduci... | 11/05/2002 |
| 6178142 | Magneto-optical disk drive utilizing leakage magnetic field from permanent magnets as external magnetic field An optical disk drive for writing, erasing and reading data on a recording surface of an optical disk medium, includes an objective lens which irradiates the recording surface with rays, a magnetic circuit which generates an electromagnetic force for posi... | 01/23/2001 |
| 6147939 | Magneto-optical recording medium having intermediate layer of in-plane magnetization A magneto-optical memory medium according to the present invention comprises a reproducing layer, which has in-plane magnetization at room temperature and perpendicular magnetization when heated to above a predetermined temperature by a reproducing light ... | 11/14/2000 |
| 6046966 | Magneto-optical data storage system A magneto-optical data storage system having a magneto-optical disk rotatably mounted on a support body. The disk has a planar storage surface with a plurality of concentrically disposed data tracks. A flying magneto-optical head is mounted on the distal ... | 04/04/2000 |
| 5757734 | Magneto-optical recording medium and method for reproducing from same A magneto-optical recording medium is composed of a reproducing layer, a recording layer, and an initializing layer, which are laminated in this order. The reproducing layer is provided so that a light beam is projected thereon so as to reproduce informat... | 05/26/1998 |
| 5687141 | Method and apparatus for recording information on magnetooptical recording medium while canceling external stray magnetic field A magnetooptical recording apparatus effects recording of information on a recording medium using an optical head and a magnetic head while cancelling an external stray magnetic field generated from an actuator, a linear motor or the like. The external st... | 11/11/1997 |
| 5636187 | Magnetooptical recording apparatus and magnetooptical recording method for canceling leakage magnetic fields associated with a recording medium and devices ancillary to the recording medium In a magnetooptical recording apparatus, a magnetic field modulated in accordance with an input signal is applied to a portion of a recording medium onto which a light beam is irradiated. The magnetooptical recording apparatus includes a device for applyi... | 06/03/1997 |
| 5617379 | Magneto-optical disk apparatus utilizing a leakage magnetic field from a magnetic driving mechanism A magneto-optical disk is provided wherein a magnetic field generated by a pair of rod-shaped permanent magnets of linear motor mechanisms for moving an optical head leaks to cover an external magnetic field generating device. The rod-shaped permanent mag... | 04/01/1997 |
| 5563853 | Magneto-optical recording apparatus that compensates for magnetic fields leaking from an objective lens actuator and a linear motor A magneto-optical recording apparatus includes an actuator for driving an objective lens for focusing a light beam on a magneto-optical disk to effect focusing and tracking, a magnetic head for applying a magnetic field to a portion irradiated by the ligh... | 10/08/1996 |
| 5502693 | Magnetic recording system for compensating leakage flux A magnetic recording system having a magnetic head and a magnetic-field generating device including a compensation circuit for supplying a current generating a magnetic field to cancel a leakage magnetic field applied to the magnetic recording medium, the... | 03/26/1996 |
| 5412627 | A magneto-optical recording system including a recording medium having a reversal preventive layer for preventing a magnetization reversal of a bias layer which is magnetostatically coupled to a recording layer Light beams having two different power levels are radiated on a magneto-optical medium having a recording layer and a bias layer magnetostatically coupled to the recording layer, thereby recording and erasing information. Upon radiation of a high level be... | 05/02/1995 |
| 5343448 | External magnetic field device for a magnetooptical information recording and reproducing apparatus An external magnetic field device for a magnetooptical information recording and reproducing apparatus in which an external magnetic field to be applied to a magnetooptical information recording medium is modulated by supplying to a magnetic head an alter... | 08/30/1994 |
| 5175714 | Method of magneto-optically recording/erasing information and magneto-optical information storage medium including recording and bias layers satisfying certain conditions A magneto-optical recording medium including a recording layer and a bias layer being stacked one upon the other to apply coupling interaction which is mainly magnetostatic interaction to each other, the bias layer having a magnetization-reversing tempera... | 12/29/1992 |
| 5126983 | Apparatus for optically recording information on opto-magnetic record medium having a minimized leakage magnetic field Apparatus for recording opto-magnetically information on an opto-magnetic record medium in the form of the direction of the magnetization stored in a magnetic layer including an objective lens for projecting a laser light beam onto the magnetic layer of t... | 06/30/1992 |
| 5105400 | Method of magneto-optically recording and erasing information onto a magneto-optical information storage medium A method of magneto-optically recording and erasing information which comprises irradiating pulse-like laser beam onto a magneto-optical information storage medium including recording and bias layers which has perpendicular magnetic anisotropy and which a... | 04/14/1992 |
| 5093816 | Optical magnetic recording and reproducing system An optical magnetic recording system has a magnetic head for generating a magnetic field on a magneto-optical disk, and an optical head including a magnetic actuator is provided for irradiating a laser beam. A field cancellation magnet is attached to the ... | 03/03/1992 |
| 4972395 | Opto-magnetic recording apparatus for sequentially driving optical head drive means and biasing magnetic field generation means An opto-magnetic recording apparatus for sequentially driving an optical head driver and a biasing magnetic field generator. The apparatus includes a biasing magnetic field generator for applying a biasing magnetic field to an opto-magnetic recording medi... | 11/20/1990 |
| 4959820 | Magnetooptical recording apparatus with constant leakage magnetic and pulse modulated magnetic field A magnetooptical recording apparatus is disclosed which is capable of performing real-time overwrite operation. The apparatus comprises a laser beam and focusing parts thereof, and a pulse magnetic field generator device, procided on both sides of a magne... | 09/25/1990 |
| 4939711 | Arrangement for minimizing effects of leakage magnetic fields in optomagnetic recording/reproducing apparatus In an optomagnetic recording/reproducing apparatus, an objective lens is actuated by a lens actuator having focusing and tracking magnetic circuits so that a light beam is focused on an optical disk and is directed to a predetermined area of the optical d... | 07/03/1990 |
| 4843600 | Recording head for magneto-optical information recording apparatus A magneto-optical information recording apparatus comprises an objective for condensing a light beam on a magneto-optical recording medium, a bias magnetic field producing device provided on the opposite side of the objective with respect to the magneto-o... | 06/27/1989 |
| 4825428 | Optomagnetic recording, reading and erasing method and implementing apparatus which permits overwriting of previously recorded information An apparatus and a method for recording, reading and erasing information, which use, as a recording medium, a magnetic film having vertical magnetic anisotropy characteristics and record, read and erase information by means of a laser beam and an external... | 04/25/1989 |
| 4789972 | Selectively controlling the erasure in a magneto-optic recording medium In a magnetic recorder, magnetooptic, for example, the erasure dircetion for successive recording areas (sectors) are determined by the direction of magnetization of prior recording. A mark is placed in each sector for identifying its erasure direction.... | 12/06/1988 |
| 4750159 | Apparatus for generating magnetic field in a magneto-optic recording/reproducing system In an apparatus for generating a magnetic field, first and second electromagnetic coils are linearly arranged on a yoke. The coils face one surface of an optical disk. An optical head is positioned above the other surface of the optical disk. A track addr... | 06/07/1988 |
| 4672594 | Magneto-optical recording system utilizing a leakage magnetic field of focusing actuator In a magneto-optical file memory wherein a storage medium having a vertical magnetic film is irradiated with a laser beam to reverse a magnetization direction of the magnetic film, thereby to write and/or erase information, and a rotation of polarizable f... | 06/09/1987 |
