| Patent Number |
Title Of Patent |
Date Issued |
| RE40136 |
Multilayer optical disk |
March 4, 2008 |
| A multilayer optical disk having an information storage layer which can as well as be reproduced by a general purpose reproducing apparatus, for example, a compact disk player, and from which information can be read from other information storage layers by using an exclusive reproducing |
| 6922376 |
Sil magneto-optic transducer having thin film magnetic coil and holded magnetic core |
July 26, 2005 |
| An optical device is provided which has a light converging unit for converging the light illuminated on a magneto-optical recording layer of an optical recording medium and a magnetic field generating unit provided on the light converging unit towards the optical recording medium. The |
| 6537637 |
Multilayer optical disk |
March 25, 2003 |
| A multilayer optical disk having an information storage layer which can as well as be reproduced by a general purpose reproducing apparatus, for example, a compact disk player, and from which information can be read from other information storage layers by using an exclusive reproducing |
| 6324148 |
Optical disk and optical information recording/reproducing apparatus |
November 27, 2001 |
| An optical disk includes at least two information recording layers on one side of the disk and at least the first information recording layer from the light incident side is of an erasable type formed with a material such as bismuth-substituted magnetic garnet or cobalt ferrite which has |
| 6243327 |
Magneto-optical disk system having a relation between a numerical aperture of an objective lens |
June 5, 2001 |
| The object of the present invention is to improve the accuracy of a recording signal and a reproduction signal of a magneto-optical recording medium. In a magneto-optical recording medium (2) having at least a metallic reflection layer (3), a back dielectric layer (4), a magneto-opti |
| 6241843 |
Multilayer optical disk |
June 5, 2001 |
| A multilayer optical disk having an information storage layer which can as well as be reproduced by a general purpose reproducing apparatus, for example, a compact disk player, and from which information can be read from other information storage layers by using an exclusive reproducing |
| 6132862 |
Magneto-optical recording medium |
October 17, 2000 |
| A magneto-optical recording medium comprising a light-transmitting substrate 1 on which a dielectric layer 2, a memory layer 3 having perpendicular magnetic anisotropy, an intermediate layer 4 having in-plane magnetic anisotropy or slight perpendicular magnetic anisotropy, a recordin |
| 6064632 |
Recording/reproducing apparatus and a magneto-optical recording medium for use therewith |
May 16, 2000 |
| A recording/reproducing apparatus for use with a photomagnetic recording medium. The apparatus comprises a magnetic coil and an optical system having a numerical aperture (NA) greater than 0.8 and arranged such that an optical axis thereof traverses the center of the magnetic coil. The |
| 6023451 |
Optical recording medium and optical disk apparatus |
February 8, 2000 |
| An optical recording medium according to the present invention includes a base layer having an information signal portion formed on a surface on the side on which laser light is incident, and a light transmissive layer formed on the base layer. A thickness t of the light transmissive lay |
| 5989670 |
Multilayer optical disk |
November 23, 1999 |
| A multilayer optical disk having an information storage layer which can as well as be reproduced by a general purpose reproducing apparatus, for example, a compact disk player, and from which information can be read from other information storage layers by using an exclusive reproducing |
| 5978320 |
Recording/reproducing apparatus for use with a photomagnetic recording medium |
November 2, 1999 |
| A recording/reproducing apparatus for use with a photomagnetic recording medium. The apparatus comprises a magnetic coil and an optical system having a numerical aperture (NA) greater than 0.8 and arranged such that an optical axis thereof traverses the center of the magnetic coil. The |
| 5766717 |
Multilayer optical disk |
June 16, 1998 |
| A multilayer optical disk having an information storage layer which can as well as be reproduced by a general-purpose reproducing apparatus, for example, a compact disk player, and from which information can be read from other information storage layers by using an exclusive reproducing |
| 5761187 |
Multi-layer optical disk |
June 2, 1998 |
| The present invention provides a multi-layer optical disk, in which even if a wave length of read light is changed at a time of reproducing, both of reproduction signals from a first information memory layer and a second information memory layer have sufficient levels.In a multi-layer op |
| 5726970 |
Multi-layer optical recording medium |
March 10, 1998 |
| A novel multi-layer optical disc according to the present invention can treat a large volume of information without deterioration in level of reproduction signals from the respective information storage layers thereof. The multi-layer optical disc comprises a substrate having a light |
| 5353171 |
Magneto-optical recording apparatus |
October 4, 1994 |
| A magneto-optical recording apparatus records information on a magneto-optical recording medium composed of a memory layer and a recording layer which are disposed on a substrate, each comprising a magnetic thin film of amorphous-rare-earth transition-metal alloy. The memory and reco |
| 4878132 |
Thermomagnetic recording method applying power modulated laser on a magnetically coupled multi-l |
October 31, 1989 |
| A thermomagnetic recording method is disclosed using a thermomagnetic recording medium where first, second and third magnetic thin films each formed of rare-earth and transition metals are sequentially superposed to form layers in a magnetically coupled manner. The recording is carried o |
