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7408729 Enhanced data storage and retrieval devices and systems and methods for utilizing same  
The present invention relates generally to the storage and/or retrieval of information on magnetic storage media by using one or more novel approaches alone or in combination. These novel...
7362693 Near-field optical storage medium and optical data storage system therefor  
An optical data storage system writes or reads information with respect to an optical storage medium using an optical pickup including a solid immersion optical system or a solid immersion lens for...
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...
6904002 Magneto-optical reproducing method using a plurality of different reproducing beams  
A magneto-optical recording medium has magneto-optical recording layers ( 11, 12, 13 ) and reproducing layers ( 21, 22, 23 ). The information recorded in the reproducing layers are reproduced by...
6856582 Method for driving magnetic head and driving circuit of magneto-optical disk drive  
A driving circuit for a magnetic head that is used for modulating magnetic field in a magneto-optical disk drive is provided, which reduces power consumption even if the magnetic head has large...
6801479 Method for recording plural rows of record marks in one track in magneto-optical recording device  
An optical disk recording method of recording data on an optical disk by applying laser light to a track of the optical disk, includes the steps of a) driving a plurality of laser light sources in...
6757221 Optical head having object lens and patterned coil  
An optical head includes a lens carrier movable at least radially of a magneto-optical disk in facing relation thereto. An object lens is mounted on the lens carrier to converge a laser beam for...
6633514 Magneto-optical reproducing method using a plural of different reproducing beams  
A magneto-optical recording medium has magneto-optical recording layers ( 11, 12, 13 ) and reproducing layers ( 21, 22, 23 ). The information recorded in the reproducing layers are reproduced by...
6628574 Reproducing method and reproducing apparatus using plural light beam powers for transferring a magnetic domain  
A reproducing apparatus for a magneto-optical recording medium has, at one end of a swing arm, a magneto-optical head provided with a slider and a solid immersion lens. A reproducing light...
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...
6256267 Method for reading and writing magneto-optical media  
A method of using laser light to access a magneto-optical disc utilizes first and second objective lenses, the second objective lens being mounted in a light channel of a slider having a primary...
6226233 Magneto-optical system utilizing MSR media  
A system for maximum magneto-optical data storage system is provided. The system utilizes double-sided first surface magnetically-induced super resolution storage media to provide the ability to...
6219308 Optical disk system having objective lens with a numerical aperture related to thickness of protective layer  
Disclosed is a magneto-optical disc system comprising a magneto-optical disc 40 with a light-transmitting cover 41, an objective lens 2 for bundling or focusing a laser beam on a magnetic recording...
6172944 Magneto-optical recording apparatus with magnetic head decoupled from objective lens focus actuator  
A method and apparatus for reading from and writing to a magneto-optical disc. The apparatus comprises a first objective lens situated between a first side of the magneto-optical disc and a first...
6115330 Optical information storage unit for recording and/or reproducing information on both the lands and the grooves of an optical medium  
An optical information storage unit records information on and/or reproduces information from both a land and a groove of an optical recording medium which have approximately the same width. The...
6104675 Method and apparatus for reading and writing magneto-optical media  
A method and apparatus for magneto-optical storage and access of data. The apparatus comprises a flying magnetic head, wherein the flying magnetic head comprises: a slider that flies over a...
6031810 Using two laser sources on a magneto-optical recording medium for preventing light intensity shortage  
An optical information recording/reproducing apparatus records information on an optical information recording medium and/or reproduces the recorded information by irradiating a plurality of light...
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...
5886969 High-density information recording/reproducing method  
An optical recording/reproducing method employs a recording laser beam having a first output and a first wavelength, and a reproducing laser beam having a second output lower than the first output...
5790483 Magneto-optical disk drive device that writes and reads from two sides of a disk  
A disk drive device is provided to realize a simultaneous dual side access to thus increase the online capacity. Two independent focussed light emitting devices focus light on first and second...
5774428 Method and apparatus for magneto-optical recording or reproducing using modulated magnetic field  
First, a recording magnetic field is generated by a magnetic head using a coil drive current a 1 , and a first data signal is recorded on a groove of a recording layer of a magneto-optical disk....
5754509 Disc device having heads mounted on the housing and movable in a radial direction  
A disc device accommodates a disc rotatably mounted therein, a plurality of first heads movable in a first direction radially of the disc, and a plurality of second heads movable in a second...
5748574 Double focal-point magneto-optic pick-up head  
A double focal-point magneto-optic pick-up head is provided. This magneto-optic pick-up head reads data from an optical disc by using a diffraction grating to diffract a laser beam into two...
5745444 Method of controlling recording information on an optical disk using replacement control information  
Information is recorded on a rewritable optical disk apparatus in accordance with the second generation 5 inch rewritable-type optical disks standards that provide for reusing once-defective user...
5684762 Opto-magnetic head apparatus  
An opto-magnetic head apparatus including a beam splitter for splitting laser light reflected from a photomagnetic recording medium into three bundles of light having different polarization...
5631893 Multi-head device for optical disk and recording/reproducing system for multiple users utilizing the same  
A recording/reproducing system for multiple users is disclosed which includes a plurality of channels connected to multiple users, a data processing portion for processing a signal of input/output...
5600623 Disc device having a plurality of heads each movable within a limited distance  
A disc device accommodates a disc rotatably mounted therein, a plurality of first heads movable in a first direction radially of the disc, and a plurality of second heads movable in a second...
5587976 Optical pickup for optical magnetic disc  
An optical pickup for an optical magnetic disc includes a light source, a grating for diffracting the light into a main light beam and auxiliary light beams, a plurality of magnetic dipole tips...
5572491 Magneto-optical recording device capable of recording two magneto-optical discs  
A magneto-optical disc recording apparatus with a high mounting efficiency and shortened access time, wherein two magneto-optical disc media are disposed facing each other, only the outside of the...
5568454 Apparatus and method for detecting a defect on a magneto-optical disk  
A magneto-optical disk inspecting apparatus in which n pairs of a write head and a read head, and an area of the magneto-optical disk to be inspected are divided into n zones, the respective n...
5566146 Recording/apparatus and method utilizing a plurality of heads for continuously recording information and reproducing the same with delay  
An information recording and reproducing device for recording and reproducing information on and from a plurality of rewritable disk-type recording media includes: a plurality of...
5530688 Optical disk recording device using two modulated laser beams for recording information data  
An optical disk data storage system uses two lasers to write data on the disk, preferably using pulse width modulation (PWM). The lasers direct two independently controllable laser beams to the...
5519682 Method of and apparatus for recording digital data on an optical disk with two optical heads  
An optical disk recordable on first and second principal surfaces thereof rotates at a constant angular velocity. First and second optical heads positioned over the respective first and second...
5448536 Magneto-optical recording device having an optical head capable of generating a circularly polarized light beam  
In a magneto-optical recording and reproducing apparatus, a magnetic field is applied to a laser source in the direction of extension of the optical axis of the laser source to radiate a circularly...
5353274 Beam diameter expansion of a multi-beam optical information system  
A plural-beam optical head is constituted by a monolithic semiconductor laser array having a plurality of light emitting points, a collimator lens for collimating laser beams emitted from the...
5327417 Optical disk drive and read/write apparatus  
In order to provide an optical disk drive and read/write apparatus, the time of erasure, recording and reproduction of data by which is shortened to heighten the apparatus in access speed and data...
5317555 Optical head device utilizing partially overlapping light spots to read information from a readout layer  
A magneto-optical disk has a recording layer whereon recorded bits are formed by the magnetic field modulation method and a readout layer whose axis of easy magnetization is parallel to the...
5270879 Magneto-optical disk inspecting method and apparatus  
This invention relates to a magneto-optical disk inspecting apparatus in which n pairs of a write head and a read head, and the area of the magneto-optical disk to be inspected is divided in n...
5263008 Magneto-optical disk device having a plurality of independently moving magneto-optical heads in the head window  
A magneto-optical disk device, in which data are written and read in and from a magneto-optical disk housed in a magneto-optical disk cartridge having a head window of a predetermined shape,...
5237547 Multi-head magneto-optical disk apparatus  
A magneto-optical disk apparatus in which a magneto-optical disk is loaded, data can be recorded on the magneto-optical disk, the data recorded on the magneto-optical disk can be reproduced and the...
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...
5093822 High-density magnetic recording and optical reproducing apparatus  
A high-density magnetic recording and optical reproducing apparatus for magneto-optically reproducing information magnetically recorded on information tracks on a recording medium, the apparatus...
5027340 Object lens head assembly  
An object lens head assembly for use with an optical recording disc comprises an information conversion apparatus for receiving an electrical signal bearing information to be written to the disc...
4926408 Magneto-optic recording/erasing system with simultaneous dual head control and disk error detection  
A magneto-optic recording/erasing system uses two heads, one for writing formatted information into sectors along a track of a magneto-optical disk and a second head working simultaneously with the...
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...
4845696 Apparatus for optically recording and reproducing information in record tracks on a rotatable record disk  
Apparatus for recording and reproducing information in record tracks on a rotatable record disc comprises a disc driving portion for rotating the rotatable record disc about an axis of rotation, a...
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...
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...
4750152 Optical read/write device  
An apparatus for reading data to and from a moving magneto-optical recording medium includes a carriage which is moved across data tracks contained in the medium. Optics for focusing a spot of...
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...
Matches 1 - 50 out of 53 1 2 >