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7210155 |
Magneto-optical recording medium having in-plane magnetizing layer
A high-density magneto-optical recording medium having excellent jitter properties is provided. A pattern-dependent shift of the length of a recorded mark does not occur even when a minute mark has...
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7200084 |
Apparatus for discriminating optical recording medium and method for discriminating optical recording medium
The present invention provides a method and an apparatus for discriminating the type of an optical recording medium and the number of recording layers in the medium. The apparatus includes a first...
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7169454 |
Multi-stack optical data storage medium and use of such medium
A description is given of a multi-stack optical data storage medium ( 20 ) for rewritable recording using a focused radiation beam ( 30 ) entering through an entrance face ( 16 ) of the medium ( 20...
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6650978 |
Method and apparatus for preserving calibration data in a vehicle seat occupant detection system
Dedicated memory locations for vehicle identification data and seat calibration data are provided in a first rewritable, non-volatile memory within an occupant detection system module and a second...
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6172945 |
Double-sided magneto-optical recording disk
A magneto-optical disc is described. The magneto-optical disc comprises a substrate and a magneto-optical recording layer applied over the substrate. The magneto-optical disc further comprises an...
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6125085 |
Optical recording method and device for optimally controlling the width of the recording marks
A method and apparatus are provided for optimally controlling the width of recording marks formed by a light beam on an optical recording medium in an optical recording apparatus. The method is...
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5966363 |
Optical and magneto-optic data storage systems utilizing transmissive media
An optical data storage system utilize a fully or partially transmissive data storage medium or disk. The optical system includes a platform capable of moving either radially or pivotally relative...
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5910932 |
Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk
An optical disc system uses a rewritable optical disc with a light-transmitting cover and an objective lens for bundling or focusing a light beam on a recording layer of the optical disc in order...
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5901118 |
Magneto-optical recording medium having a readout layer and a recording layer
A magneto-optical recording medium having a substrate whereupon a transparent dielectric layer, a readout layer showing in-plane magnetization at room temperature and perpendicular magnetization...
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5862103 |
Magneto-optical recording method capable of determining optimum laser beam intensities
A method and apparatus for recording data on a magnetooptical recording medium finds an optimum laser beam intensities for recording. The method and apparatus do not cause a low level P L setting...
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5784343 |
Magneto-optical recording and/or reproducing apparatus having a plurality of optical systems
A magneto-optical recording and/or reproducing apparatus having a magnetic head and first and second optical systems for recording on and/or reproducing from first and second magneto-optical media....
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5757736 |
Method of and apparatus for recording information to magneto optical disc having plural recording layers
The magneto optical disc is provided with at least first and second recording layers such that the record information is recorded to the first recording layer at a vertically magnetized state...
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5757733 |
Optical disc system having an objective lens with a numerical aperture related to the thickness of the protective layer
A magneto-optical disc system includes a magneto-optical disc 40 with a light-transmitting cover layer 41, an objective lens 2 for bundling or focusing a laser beam onto a magnetic recording layer...
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5731076 |
Recording media
A recording media comprises in cross-section, a substrate, a first dielectric layer, a recording section, a second dielectric layer and a reflector layer. The recording section comprises a...
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5644555 |
Multiple data surface magneto-optical data storage system
An optical data storage system comprises an optical disk drive and a multiple data surface magneto-optical medium. The medium comprises a substrate, a first dielectric layer, a first...
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5617378 |
Magneto-optical disc system having an objective lens with a numerical aperture related to the thickness of the protective layer
An magneto-optical disc system includes an magneto-optical disc with a light-transmitting cover and an objective lens for bundling or focusing a laser beam on a recording layer of the...
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5610880 |
Optical disc system and optical disk therefor
An optical disc system using an optical disc with a light-transmitting cover and an objective lens for bundling or focusing a laser beam on a recording layer of the optical disc in order to perform...
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5528565 |
Magneto-optic recording system
A magneto-optic recording system uses a unit recording medium having on a substrate a first magnetic layer whose Curie temperature is low and also having on the first magnetic layer a second...
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5487926 |
Optical disk
An optical disk includes a pair of disk substrates and a recording layer on at least one substrate, the disk substrates being mated by bonding the substrates at their inside surfaces through an...
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5481508 |
Magneto-optic recording medium method of manufacturing the same and magneto-optic recording system
A unit recording medium, having on a substrate a first magnetic layer whose Curie temperature is low and also having on the first magnetic layer a second magnetic layer whose Curie temperature is...
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5420834 |
Optical disk recorders using disks coatings close to outer surfaces with optical path extending through a thick transparent substrate
A magnetooptical disk has two axially space-apart translucent recording layers. Each translucent recording layer is axially closer to an outer surface of the disk than to the other recording layer....
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5392262 |
Two-sided optical disks having recording layers disposed close to outer surfaces and spaced axially apart a greater distance and devices for using the disks
A magnetooptical disk has two axially space-apart translucent recording layers. Each translucent recording layer is axially closer to an outer surface of the disk than to the other recording layer....
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5381390 |
Directly overwrite information by using two radiation beams onto a single magneto-optical recording
Apparatus is disclosed for the direct overwriting of an optical storage medium having a magneto-optical recording layer. The apparatus includes a condensing lens for focusing radiation from first...
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5340647 |
Optomagnetic recording medium
An optomagnetic recording medium comprising a substrate plate and, provided thereon, a recording layer and a reflection layer, said reflection layer consisting of a thin layer of an alloy of...
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5305254 |
Magneto-optic memory device
A magneto-optic memory device, such as a magneto-optic disk or magneto-optic card having a pair of opposed substrates at least one of which is transparent. Between the substrates is a magneto-optic...
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5287334 |
Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus
A magneto-optical pickup apparatus includes an objective lens for focusing a laser beam emitted from a laser device onto a magneto-optical recording medium, driving coils, on which the objective...
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5270966 |
Magneto-optical memory device for multi-wavelength recording and reproduction
A rewritable magneto-optical memory device for multi-wavelength recording and reproduction having a high packing density. The device is form by a plurality of magnetic film layers, each of which...
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5197049 |
Head and media for optical data storage
A head and media for optical data storage with a media in which a partially light transmissive recording layer and a reflective layer are located on opposite faces of a transparent substrate layer....
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5146438 |
Method of making double-sided magneto-optical disks having reduced birefringence
The invention is directed to a two-sided magneto-optical recording disk having reduced birefringence comprising a pair of single-sided magneto-optical recording disks, the entire recording sides of...
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4926403 |
Magneto-optic recording apparatus for recording information selectively on both sides of the recording medium
A magneto-optical recording system comprises a first optical system carried by a first focusing actuator disposed at a first side of a magneto-optical recording medium and second optical system...
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4922454 |
Magneto-optical memory medium and apparatus for writing and reading information on and from the medium
A magneto-optical memory medium of a laminar structure comprising at least one non-magnetic layer, and a plurality of magneto-optical storage layers separated from each other by corresponding...
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4905215 |
System for reading information from two storage layers of an optical disk in different manners
An information-reproducing system for reading information from a plurality of storage layers of an optical disk. The system includes a light source for irradiating the optical disk with a...
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4807204 |
Magneto-optical recording medium having pairs of mutually corresponding recording segments, and apparatus for recording information on the medium
A magneto-optical recording apparatus for writing information on a magneto-optical recording medium having at least one pair of magneto-optical storage layers each pair consisting of a first and a...
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4802021 |
Recording and/or reproducing apparatus using opto-magnetic disc
An apparatus for recording and/or reproducing a signal by using an opto-magnetic disc including an erasing and reproducing opto-magnetic head unit having outer and inner opto-magnetic heads, a...
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4788671 |
Information recording and reproducing apparatus for effecting simultaneous recording and reproduction but at different rates
There is disclosed an information recording and reproducing apparatus which is provided with a disk-shaped recording medium having a recording face allowing information recording and reproduction...
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4660187 |
Light signal reading method and apparatus using interference between two light beams of different frequency and polarization
A light signal reading method in which a first light beam modulated to a polarized state in accordance with information magnetically recorded on a recording medium is caused to interfere with a...
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4630249 |
Method of recording information in a magneto-optical record carrier, apparatus for carrying out the method, and magneto-optical record carrier for use in an apparatus for carrying out the method
The disclosed method for writing information in a magneto-optical record carrier employs two light beams each positioned on one of two tracks on the record carrier. In one track information is...
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