Matches 1 - 50 out of 112 1 2 3 >
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7352659 Method and apparatus for phase and/or copy window control use with a domain expansion recording medium and record carrier  
A method and apparatus for controlling read-out and/or synchronization between an external magnetic field and written data during a reading operation from a magneto-optical recording medium...
7307923 Electro magnetic field generating element, information recording and reproducing head and information recording and reproducing device  
To realize an electromagnetic field generating element, an information recording and reproducing head and an information recording and reproducing device for high frequency magnetic recording and...
7292521 Optical data storage and systems utilizing plasmon lenses  
A light-plasmon coupling lens including an optically transparent substrate having a light incident surface and a light-plasmon coupling surface opposite the light incident surface. The...
7258236 Methods and devices utilizing adsorption of chiral molecules at a surface or interface  
The present invention is concerned with the adsorption of chiral molecules at surfaces or interfaces, with the arrangement and properties of adsorbed chiral molecules, and with devices and methods...
7206262 Optical disk recording/reproducing device  
A moved distance detecting means ( 15 ) detects the moved distance in a tracking direction of an object lens, a position signal generating means ( 60 ) generates a position signal corresponding to...
7168081 Domain stabilized magneto-optic head  
A magneto-optic head includes a magnetic layer formed to have a substantially stabilized magnetic domain configuration. The magnetic layer includes a set of magnetic domains that includes one or...
7127729 Magneto-optical head and magneto-optical disk drive  
A magneto-optical head including a lens forming a light spot on a storage disk, a magnetic field generating coil arranged between the lens and the disk to surround the optical center of the lens,...
6982845 Magnetic recording apparatus and magnetic recording method  
A magnetic recording apparatus comprises a magnetic field impression unit, a current supplying unit and a controlling unit t. The magnetic field impression unit impresses a magnetic field to a...
6950261 Magnetic pattern forming method, magnetic pattern forming apparatus, magnetic disk, and magnetic recording apparatus  
A magnetic pattern forming apparatus, which is designed to form a desired magnetic pattern on a magnetic disk having a magnetic layer on a substrate, is made up of a mask having a pattern identical...
6931654 Hybrid disc and method and apparatus for discriminating same  
A DVD playback apparatus accurately discriminates a hybrid disc, to prevent a recordable CD installed therein from being damaged by a laser beam for a DVD/MMCD. The hybrid disc includes a label...
6893746 Magnetic recording medium with high thermal stability, method for producing the same, and magnetic recording apparatus  
A magnetic recording medium comprises an information-recording film and a ferromagnetic film on a substrate. The information-recording film is composed of, for example, an amorphous ferrimagnetic...
6816330 Method for forming a magnetic pattern in a magnetic recording medium, magnetic recording medium magnetic recording device and photomask  
A method for forming a magnetic pattern in a magnetic recording medium, which includes irradiating energy beams to a magnetic recording medium having a magnetic layer on a substrate via a photomask...
6741549 Optical recording medium and optical recording and reproduction apparatus  
An optical recording medium in accordance with the present invention is provided with a substrate, a mask layer, provided on the substrate, whose index of refraction changes due to light or heat of...
6724693 Optical disk having readable information on both sides of the disk combination with an optical disk device  
An optical disk has a magnetic recording medium and/or magnetic playback medium. The magnetic substance carrying recording data is formed on the label side of the optical disk. The magnetic...
6714370 Write head and method for recording information on a data storage medium  
A recording head for use in conjunction with a magnetic storage medium, comprises a waveguide for providing a path for transmitting radiant energy, a near-field coupling structure positioned in the...
6702186 Assembly comprising a plurality of media probes for writing/reading high density magnetic data  
The invention discloses in one embodiment a parallel probe array (N×M) incorporating thermal near-field heaters (or writers) as well as magnetic sensors (or readers), which can be moved en bloc as...
6671232 Method and apparatus for measuring the surface temperature of a disk  
A technique for determining the recording medium temperature, thereby enabling high track density in Hybrid recording. This allows compensation for changes in the ambient temperature and variations...
6587410 Recording/reproducing apparatus and method that can record/reproduce a signal properly, and to correct phase difference between control/driving signals to appropriate laser of magnetic drive circuit  
Various conditions such as the power of a pulse beam for recording emitted from an optical head to a magneto-optical recording medium, the power of continuous light in reproduction, the intensity...
6560169 Magneto-optical recording and reproduction apparatus exhibiting suppressed vibration  
A magneto-optical recording and reproduction device includes an optical pickup for irradiating a magneto-optical disk with a laser beam for performing at least one of information recording to a...
6542443 Efficient linearization of saturation channels  
A data storage system achieves improved bandwidth efficiency using a modulated recording signal, channel linearization, and a compressor circuit for compressing peak amplitude of the recording...
6490117 Method of thermally printing servo patterns on magnetic media  
A method and apparatus for thermally writing a magnetic servo pattern on a magnetic disc medium prior to assembling the medium in a disc drive are provided in which the medium is first magnetized...
6434087 Optical disc system and method for controlling bias coil and light source to process information on a storage medium  
An optical disc system for storing information on a medium includes a light source, a focusing mechanism, and a tracking mechanism wherein the mechanisms are controlled by a feedback loop and the...
6418088 Apparatus and method for reproducing information from a magneto optical recording medium by the magnetic domain magnification method  
A laser beam is directed from an optical head ( 40 ) while an alternating magnetic field is applied from a magnetic head ( 52 ). A reproduced signal from the optical head ( 40 ) is input to a...
6400653 Information recording/reproducing apparatus to record/reproduce information on a recording medium recorded with an address mark  
An magneto-optical disc recording/reproducing apparatus includes an optical head ( 36 ) to detect a wobble ( 46 ) and an address mark ( 81 to 84 ) in an magneto-optical disc ( 31 ) and output a...
6396774 Information reproducing device, information recording/reproducing head, and information reproducing method utilizing mono-magnetic domain structure  
An information reproducing head which uses a magnetic-substance chip having mono-magnetic domain structure as an information reproducing device so that information, which has been recorded on an...
6396773 Photo servo patterning on magneto-optical media  
The present invention relates to a rigid disc substrate for use in a magneto-optical drive, and two methods and apparatus to solve the above-mentioned problems. A method for writing a servo...
6388954 Magneto-optical recording medium having clock-marks on recording layer and apparatus for recording and reproducing same  
The magneto-optical recording medium has a magnetic domain magnification reproducing layer and an information recording layer. Clock marks are formed on the information recording layer, making it...
6272086 Low cost tamper-resistant method for write-once read many (WORM) storage  
A tamper-resistant Hard-WORM data storage system and a magneto-optical storage disk therefor is disclosed. The disk has a plurality of sectors thereon containing one or more uniquely formatted...
6208594 Efficient linearization of saturation channels  
A more linear duty cycle modulator is made by converting the sine wave bias into a triangle wave bias utilizing a sample and hold circuit as the base band signal is added; on readout, low pass...
6192008 Device and method for reproducing record information from magneto-optical recording medium  
In a method and device for reproducing record information from a magneto-optical recording medium, reproducing light and an alternating magnetic field signal are applied onto the magneto-optical...
6178144 Magneto-optical recording system employing linear recording and playback channels  
A magneto-optical recording system achieves improved bandwidth efficiency using a modulated recording signal, recording channel linearization, and a MO medium having a low inter-granular exchange...
6072754 Magneto-optical medium and reproducing device for the same  
A magneto-optical medium and a reproducing device for the medium has, in the magneto-optical medium, a mark in a magneto-optical recording area is so formed as to correspond to one of "1" and "0"...
6005830 System for checking the recoding state of data on a magneto-optical disk  
A device for checking the recording state of a magneto-optical recording disk includes a detector for detecting a s-polarized light component and a p-polarized light component from a reflected...
5894459 Optical recording/reproducing device having a controller for reducing vibrational noise during recording by slowing moving speed of pickup  
An apparatus for recording and/or reproducing a disk-shaped optical recording medium such as a magneto-optical disk includes recording and/or reproducing unit, a moving unit and a controller. The...
5828629 Optical recording and/or reproducing apparatus with stupping motor drive frequency which is lower than resonant frequency of transmission system  
An optical recording and/or reproducing apparatus employing a stepping motor for driving an optical pickup for movement in radial directions of a disk. The frequency of a driving pulse signal for...
5805536 Method for bandwidth reduction in writeable optical data storage apparatus  
A method for reading data from an optical medium having improved settling time characteristics and reduced bandwidth requirements, including producing a gain adjusted front facet monitor signal...
5793713 Magneto-optical recording device and method for judging the recorded signals by detecting magnetization states  
A magneto-optical disc recording apparatus is constituted by a pre-output detection circuit, a post-output detecting circuit, a pre-output pulsing circuit, a post-output pulsing circuit, a logical...
5771216 Photomagnetic recording device and photomagnetic reproducing device  
In photomagnetic recording device and photomagnetic reproducing device where a record light beam is irradiated to a photomagnetic record medium in response to a record light thereby a pit is formed...
5687143 Reproducing apparatus having an optical head system  
A reproducing apparatus for reproducing an information signal from a recording medium in which a recording medium has a modulated information signal recorded thereon by one of different recording...
5684763 Optical recording/reproducing device having control for reducing vibrational noise during recording by slowing moving speed of pickup  
An apparatus for recording and/or reproducing a disk-shaped optical recording medium such as a magneto-optical disk includes a recording and/or reproducing unit, a moving unit and a controller. The...
5682366 Optical disc recording apparatus with efficient data checking  
An optical disc recording apparatus which requires no additional head optical system and is capable of reducing the time required for a data checking operation. By detecting any irregularity of a...
5668787 Mark length recording system with trial writing to maximize recording power and error recovery  
An optical disk recording, and reproducing apparatus for recording and reproducing information and which is capable of storing a large amount of information, transferring data at a high speed, and...
5654058 Magneto-optical disk  
In a magneto-optical disk for recording, reproduction or erasing with a laser beam, which comprises a film of four-layer structure consisting of a first dielectric layer, a magneto-optical...
5648944 Recording/reproducing apparatus that utilizes the servo clock signals to form read and write clock signals with different frequencies  
A disc recording and/or reproducing apparatus including a signal recording/reproducing section for recording and/or reproducing information signals on a disc 64 mm in diameter housed in a cartridge...
5644556 Magneto-optical disk having cellularly divided regions with alternating directions of magnetization and method of initializing direction of magnetization of magneto-optical disk prior to recording of information  
A magneto-optical disk is of a type in which magnetic record pits are formed by thermomagnetic recording on a magnetic member and the pits are read utilizing the photomagnetic effect. The disk has...
5602805 Disk drive apparatus and method including power backup  
The magneto-optical disk drive apparatus according to the present invention sends a notice for inhibition of writing write data into a magneto-optical disk to a host computer when a volume of...
5600612 Magnetooptic recording method and apparatus  
In magnetooptic recording, compensation is provided for changes in temperature up and down characteristics for heating and cooling processes of a recording medium due to the rise and fall of a...
5590099 Magneto-optical recording method and method for making information-carrying magneto-optical recording medium  
In a magneto-optical recording disc of the magnetic field modulation recording mode, recording of information for the first time is carried out in an optical modulation mode at a linear velocity...
5587975 Magneto-optical disk reproducing apparatus with gain and offset controlled by a reference pattern read from the disk  
Data that is recorded in a track on a magneto-optical disk and which contains a reference pattern that exhibits distinct amplitude levels is read from that disk by an optical head and then gain...
5581524 Magnetooptical information recording and/or reproducing method and apparatus in which prior to actual recording and/or reproducing, information is recorded on a recording medium to set reference conditions for actual recording and/or reproducing  
Recording of information on and/or reproduction of information from a magnetooptical recording medium is effected as follows. A light beam from an objective lens is irradiated on a track of the...
Matches 1 - 50 out of 112 1 2 3 >