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| Number | Title | Issue Date |
| 7248554 | Laser driving apparatus A strategy process used for recording data on an optical disk is also used during DC erase is performed. Effects similar to those obtained in the case, in which a high frequency signal is superposed on a laser diode output current during the DC erase, can be obtaine... | 07/24/2007 |
| 7225985 | Optical scanner An optical scanner is provided with a carrier, a casing, a driving unit and a transmission unit. The carrier has a connecting unit and an optical system mounted thereon. The casing has a guiding rail formed as integral unit on the interior wall. The guiding rail has... | 06/05/2007 |
| 6944101 | Recording pole for delivering coincident heat and magnetic field A magnetic recording device is provided according to the present invention for magnetic recording on a recording medium. The magnetic recording device includes a magnetic pole and a C-aperture structure disposed adjacent the magnetic pole. A focusing element receive... | 09/13/2005 |
| 6212137 | Magneto-optical recording medium by magnetic field modulation with the use of smaller magnetic fields A storage medium includes at least a storage layer, a non-magnetic layer, a storage supplementary layer, an anti-oxidation layer, and a ferromagnetism material layer provided in this or reverse order on a substrate. Owing to a magnetic field produced by t... | 04/03/2001 |
| 6205092 | Magneto-optical recording and reproducing apparatus and method A magneto-optic recording medium reproduction device includes a multi-clad, step index optical fiber, a semiconductor laser arranged on one end surface side of the optical fiber for providing laser beam to one end surface of the optical fiber, a photodete... | 03/20/2001 |
| 6134193 | Translational, bias-field device for a magneto-optical system A translational, bias-field device for a magneto-optical system having a magneto-optical recording clement moving through a magnetic field created by the bias-field device so that information can be selectively recorded on or erased from the recording ele... | 10/17/2000 |
| 5856957 | Magnetic field applying device A compact magnetic field applying device rotates and holds a magnetic field generating member using a small-scale, light-weight vibration actuator. A permanent magnet applies a bias magnetic field on a magnetized information recording area of a magnetoopt... | 01/05/1999 |
| 5710747 | Dual coil, translational bias-field device for a magneto-optical system A translational, bias-field device for a magneto-optical system having a magneto-optical recording element moving through a first magnetic field created by the bias-field device so that information is selectively recorded on or erased from the recording e... | 01/20/1998 |
| 5619479 | Translational bias-field device for a magneto-optical system A translational, bias-field device for a magneto-optical system having a magneto-optical recording element moving through a first magnetic field created by the bias-field device so that information can be selectively recorded on or erased from the recordi... | 04/08/1997 |
| 5590096 | Rewritable storage apparatus using first and second bias magnetic fields The speed of a write operation in an optical magnetic disk unit is improved by effectively setting the bias magnetic field. When new data is written in an area on a medium, a bias control method for a rewritable storage apparatus which records data by app... | 12/31/1996 |
| 5570329 | System for selectively inverting a magnetic bias field for magneto-optic recording An apparatus for selectively inverting an external magnetic field in a magneto-optic recording system so that information can be selectively recorded on or erased from a magneto-optic recording element of the system moving through the field, the apparatus... | 10/29/1996 |
| 5535181 | Permanent magnet device for selectively inverting a magnetic bias field for magneto-optic recording An apparatus for selectively inverting an external magnetic field in a magneto-optic recording system so that information can be selectively recorded on or erased from a magneto-optic recording element of the system moving through the field, the apparatus... | 07/09/1996 |
| 5363353 | Magneto-optical disk drive having multiple electromagnet elements An magneto-optical disk drive comprises a driving apparatus for rotating a medium, an electromagnet positioned above or below the medium for producing a magnetic field on a recording surface of the medium, and an optical head by which laser light illumina... | 11/08/1994 |
| 5345431 | Write and erase assembly for magneto-optic drive apparatus A write-erase magnet assembly for a data storage device including: a permanent magnet having a longitudinal axis and having a first longitudinally extending face portion with a first polarity and a second longitudinally extending face portion with a secon... | 09/06/1994 |
| 5218488 | Method and apparatus for producing write and erase magnetic field for disk drive A magneto-optic disk drive includes a magneto-optic disk and a rotary arm for positioning a focus/bias field switching assembly adjacent bit positions on the disk. A bias field switching assembly includes an annular permanent magnet mounted within a guide... | 06/08/1993 |
| 5043959 | Apparatus for developing a magnetic field which maintains a neutral position when the magnetic biasing field is not applied An apparatus for operating a magneto-optic medium includes a magnetic biasing field developing device for developing a magnetic biasing field which is applied to the magneto-optic medium when the magneto-optic medium erases or records data. Additionally, ... | 08/27/1991 |
| 5022017 | Magneto optic data recording system with variable field strength, actuator therefor and method of providing For magneto-optic data recording, permanent magnets are used to produce a magnetic field with a variable field strength. The field strength is varied by controlled rotation of the magnets about their longitudinal axis, which also allows inversion of the d... | 06/04/1991 |
| 5014254 | Magneto-optical recording method and magneto-optical recording apparatus A method and apparatus are revealed for recording information on a record carrier (1) having a magneto-optical recording layer (2), a pattern of magnetic domains (23, 24) having a first and a second direction of magnetization being formed in the recording... | 05/07/1991 |
| 4977549 | Write and erase magnetic bias field switching system for a magneto-optic disk drive A magneto-optic disk drive includes a magneto-optic disk and a rotary arm for positioning a focus/bias field switching assembly adjacent bit positions on the disk. A bias field switching assembly includes an annular permanent magnet mounted within a guide... | 12/11/1990 |
| 4937801 | Magneto-optical recording and reproducing apparatus with magnetic field controller In a magneto-optical recording and reproducing apparatus for effecting the recording of information, etc. by irradiating a magnetic recording layer of a magneto-optical disk with a laser beam focued by an objective lens and applying a magnetic field to a ... | 06/26/1990 |
| 4849952 | Magnetooptical information recording apparatus having intensified magnetic flux applying means A magnetooptical information recording apparatus is provided with a device for irradiating a magnetooptical recording medium with a light beam, and a device for applying a bias magnetic field to a portion, irradiated by the light beam, of the magnetooptic... | 07/18/1989 |
| 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 |
