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| Number | Title | Issue Date |
| 7277363 | Magneto-optical recording or reproducing device A magneto-optical recording or reproducing device having an information erasing means for erasing information or data recorded on a magneto-optical recording medium. According to the invention, the information erasing means comprises an erasing magnet having a field... | 10/02/2007 |
| 7142483 | Optical storage drive with functions of detecting turn over An optical storage drive with functions of detecting turn over is disclosed. When it is detected that an optical storage drive is turned over, the power of the optical storage drive is turned off, or the operation of the optical storage drive is stopped, or the opti... | 11/28/2006 |
| 7139140 | Method and apparatus of magnetically transferring information signal from master medium to slave medium When executing a magnetic transfer by bringing a master medium and a slave medium into close contact with each other and applying a transferring magnetic field, a permitted limit of the application direction of the transferring magnetic field is defined so that magn... | 11/21/2006 |
| 6212136 | Magneto-optical disc apparatus with means to change the angle and distance between a magnetic field generating source and a magneto-optical disc The present invention is directed to a magneto-optical disc apparatus which includes a magnetic field generating source (12). The magnetic field generating source (12) is disposed so as to become freely rotatable with respect to a magneto-optical disc (1)... | 04/03/2001 |
| 6044042 | Method and apparatus for inverting a bias field for magneto-optic recording and erasing A bias-field apparatus for a magneto-optical system having a magneto-optical recording element which includes a conductive substrate and which moves through a magnetic field created by the bias-field device so that information is selectively recorded on o... | 03/28/2000 |
| 5909411 | Magnetically coupled apparatus for inverting a bias field for magneto-optic recording and erasing A bias-field apparatus for a magneto-optical system having a magneto-optical recording element which includes a conductive substrate and which moves through a magnetic field created by the bias-field device so that information is selectively recorded on o... | 06/01/1999 |
| 5777952 | Thin bias magnet unit for magneto-optical recording device A bias magnet unit has a permanent magnet that applies a bias magnetic field to an optical spot on a magneto-optical disk. A driving coil rotates the magnet in order to change a polarity of the bias magnetic field. A sensor detects the intensity and polar... | 07/07/1998 |
| 5768220 | Motorless bias-field device and method having magnetic coupling between a magnetic and the recording element for inverting the magnetic field A bias-field device for a magneto-optical system having a magneto-optical recording element which includes a conductive substrate and which moves through a magnetic field created by the bias-field device so that information is selectively recorded on or e... | 06/16/1998 |
| 5544132 | Apparatus for selectively inverting a magnetic biased 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 said field, the apparatu... | 08/06/1996 |
| 5490124 | 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... | 02/06/1996 |
| 5317548 | Reduced height magnetic bias apparatus for a magnetooptical disk drive including a coil means having a central axis perpendicular to the rotating axis of a rotatable magnet A magnetic bias apparatus for generating a magnetic field for recording or erasing information in the magnetooptical disk drive apparatus is disclosed. The magnetic bias apparatus has a permanent magnet for generating a bias magnetic field which is rotata... | 05/31/1994 |
| 5291345 | Apparatus for applying magnetic field and magneto-optical disk storage having such apparatus An apparatus for applying a magnetic field has a permanent magnet, pivotally supported, which has an approximate cylindrical shape, respective semicircles of a circular section thereof being magnetized as N and S poles, and a driving coil, located in the ... | 03/01/1994 |
| 5229983 | Bias magnetic field generating apparatus for magneto-optical recording and reproducing system An apparatus for generating a bias magnetic field to a magneto-optical disk includes a movable magnet which serves to generate a bias magnetic field. A suitable device serves to generate a drive magnetic field to move the magnet. A stopper is engageable w... | 07/20/1993 |
| 5072432 | Magnet turn-over mechanism for recording and/or erasing an information on and from a magneto-optical disk by selectively applying a first and a second predetermined magnetic fields A magnet turn-over mechanism for turning a permanent magnet used for applying first and second predetermined magnetic fields selectively to a magneto-optical disk for recording and/or erasing an information on and from the magneto-optical disk comprises s... | 12/10/1991 |
| 5038330 | Bias magnetic field impress apparatus for opto-magnetic disk apparatus including permanent magnet A bias magnetic field apparatus for opto-magnetic disk apparatus includes a permanent magnet provided so as to closely oppose a side of an opto-magnetic disk opposite the side opposed by the optical head, the permanent magnet rotataably movable around an ... | 08/06/1991 |
| 5020042 | Apparatus for selectively inverting a magnetic bias field using a rod-shaped permanent magnet surrounded with an electrically conductive damping means Apparatus for selectively reversing a magnetic bias field (e.g., to switch between recording and erasing modes in a magnetooptic recording system) includes a rod-shaped permanent magnet having its magnetic poles oriented along the cross-sectional dimensio... | 05/28/1991 |
| 4984224 | Apparatus for recording and/or erasing an information signal on and from a magneto-optical disk wherein the magnetic biasing field means is part of a rotor magnet included in a stepping motor A recording head of a magneto-optical disk apparatus for recording and/or erasing an information signal on and from a magneto-optical disk mounted on the apparatus comprises optical pickup device disposed at a first side of the magneto-optical disk for pr... | 01/08/1991 |
| 4972337 | Device for controlling rotation of a magnet used in a magneto-optical recording system A rotation control for a magnet used in a magneto-optical recording system having a first coil that rotates a permanent magnet to invert the polarity of its magnetic field applied to an optical recording type disc and a second coil provided at the positio... | 11/20/1990 |
| 4962492 | Magneto-optic data recording system, actuating device therefor and method of providing same A magneto-optic data recording system and actuating device therefor comprises a permanent magnet mounted adjacent to a magneto-optic disk medium. The permanent magnet is rotatable about its longitudinal axis to change the polarity of the magnetic field wh... | 10/09/1990 |
| 4748606 | External magnetic field inverting apparatus for magneto-optical disc apparatus The present invention relates to an external magnetic field inverting apparatus for magneto-optical disc apparatus in which a permanent magnet (15) is used as external magnetic field generating means and a winding (25) is located so as to surround the per... | 05/31/1988 |
| 4701895 | Magnetic biasing apparatus for magneto-optic recording including a permanent magnet A magneto-optic disc recording system includes a cylindrical permanent magnet for providing magnetic biasing selectively for the recording and erasing processes. The magnet is positioned radially with respect to the disc rotation, on the opposite side of ... | 10/20/1987 |
