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7336580 Optical recording method, optical recorder, and optical recording medium  
The object of the present invention is to provide an optical recording method for recording data in an optical recording medium, which can reduce jitter of a reproduced signal even in the case...
7313075 Optical information recording method and apparatus  
An optical information recording method and apparatus which records information on a recording medium by irradiating the recording medium with an irradiation light of a recording power to form a...
7289422 Optical devices having transmission enhanced by surface plasmon mode resonance, and their use in data recording  
A device includes an optical gain medium through which optical radiation is amplified. The device includes first and second reflectors disposed around the gain medium. One of the reflectors...
7282320 Apparatus for three-dimensional optical data storage and retrieval  
A three dimensional optical data storage and retrieval system that includes a three dimensional optical data storage medium and an apparatus for providing access to data stored on the medium. The...
7277364 Magneto-optical recording medium device  
A magneto-optical recording medium device of the present invention optimizes a magnetic field forming the front mask and a magnetic field forming the rear mask by use of a single bias magnetic...
7239599 Light irradiation head and information storage apparatus  
A light irradiation head of the present invention includes: a propagation body having a tapered two dimensional shape axially symmetrical to a predetermined symmetrical axis, and consisting of a...
7190641 Optical recording, producing apparatus, and method with peak-hold voltage features  
The present invention proposes a method of controlling the laser power of a semiconductor laser that, in this method of controlling the laser power of a semiconductor laser by applying a power...
7133344 Disk recording-playback device  
A disk recording-playback device including a laser drive circuit for feeding a drive signal to an optical head and adjusting the power of a laser beam irradiated by the optical head, an error...
7126886 Magneto-optical recording medium and method for producing the same  
According to the present invention, a light beam is radiated to an area between recording tracks while the intensity of a magnetic field from the outside to a magneto-optical recording medium is...
7065012 Optical storage device and emission control method  
An optical storage device decreases the influence of return light to the laser light source and prevents an increase of power consumption even if high frequency superimposing is performed. The...
6950260 Thermally assisted magnetic recording system and method of writing using magnetic and thermal gradients  
A magnetic recording system is provided having a write head employing a combination of magnetic write field gradient and thermal gradient to write data on a ‘thermal spring’ magnetic recording...
6944101 Recording pole for delivering coincident heat and magnetic field  
A magnetic recording device is provided according to the present invention for magnetic recording on a recording medium. The magnetic recording device includes a magnetic pole and a C-aperture...
6842711 Power calibration system  
The present invention provides a high precision, low cost laser power calibration system. First, the photo signals output from a standard photo diode are received by a photo calibration system;...
6781941 Field serviceable laser pen for optical disk drives  
A laser source is located in a relatively cool accessible location. Because there is adequate heat dissipation for the laser source, changes in the laser wavelength that arise from laser...
6754141 Recording medium, method for recording and reproducing data using the medium, and magneto-optical recording apparatus  
A magneto-optical recording medium, a method for recording and reproducing data using the medium and a magneto-optical recording apparatus are provided in which an optical head reads the recorded...
RE38501 Magnetooptical recording medium and information recording and reproducing methods using the recording medium  
A method of recording information on and reproducing information from a magnetooptical recording medium which includes first and second magnetic layers. The method includes the step of projecting a...
6714230 Method for optically recording information on an optically re-writable information medium  
A method for optically recording information on an optically re-writable information medium is described. A mark is formed on a recording medium by radiating a laser light having the strength of...
6674693 Recording method, reproducing method and recording and reproducing apparatus for magneto-optical recording medium  
While a magneto-optical recording medium is irradiated with a laser beam, the medium is rotated relative to the beam at a controlled speed in such a manner that a high temperature region of a heat...
6671235 Method of and apparatus for defining disk tracks in magnetic recording media  
A method of, and apparatus for, defining disk tracks in magnetic recording media. The track-writing apparatus ( 20 ) is capable of forming tracks ( 340 ) with a track width (TW) and track spaces (...
6522604 Apparatus and method for inscribing, optically detecting, and using a clock pattern to write a servo pattern in an information storage unit  
Apparatus ( 10 ) and method ( 100 ) for inscribing a clock pattern ( 14 ), detecting the clock pattern ( 14 ) optically, and using the clock pattern ( 14 ) to write a sevo pattern in an information...
6317280 Thermomagnetic recording and reproducing head having a heating head with a width narrower than the magnetic heads, a recording and reproducing device with such a heating head and methods related thereto  
A thermomagnetic recording and reproducing head includes a floating slider, and a heating head, a reproduction-use magnetic head as an MR head and a recording-use magnetic head as a thin-film...
6304522 Data medium optical recording/reading device  
An optical read/write device for an information medium which includes a transparent substrate having an approximately plane face carrying at least one pair of electrodes defining an airgap area...
6229783 Optical recording device having a medium with two superimposed levels and method for reading  
An optical recording device including a medium having a first recording level, which includes a first active film having amorphous areas and crystalline areas, the first recording level being...
6111823 Method for recording information data on magneto-optical recording medium without cross-erasing  
A data recording method for a magneto-optical recording medium that is adapted to record a data on the magneto-optical recording medium without cross-erasing. In this method, a laser light is...
6101154 Method of recording data on magneto-optical recording medium and apparatus thereof  
A method and apparatus for recording data on a magneto-optical recording medium that is adapted to record a data on the magneto-optical recording medium without cross-erasing and to record a data...
6058077 Signal reproducing method and apparatus for reproducing information by moving magnetic wall  
In a signal reproducing apparatus, information is reproduced by moving a magnetic wall on a magnetic recording medium as follows. A temperature profiled is given the medium by using a light beam so...
5982714 Laser beam adjusting for magnetic field modulation overwrite magneto-optical recording device  
The invention provides a laser strobe type magneto-optical recording apparatus wherein the recording laser power can be set in conformity with an influence of variations such as environmental...
5959942 Method and apparatus for reading a magneto-optical recording medium with asymmetrical edges  
A reading method and reading apparatus for a magneto-optical recording medium designed to modulate an applied magnetic field. The magnetic field corresponds to the leading and trailing edges of a...
5956295 Magneto-optical disk drive supporting a direct-over-write operation and a write-after-erase operation  
A magneto-optical recording system which is compatible the write-after-erase magneto-optical media and the directly-over-write magneto-optical media. The magneto-optical recording system provided...
5886958 Information recording apparatus and method for modulated magneto-optical recording medium  
A magneto-optical data recording system comprises magnetic field pulse applying means for applying to a magneto-optic recording medium a magnetic field pulse of a polarity corresponding to code...
5859813 Magneto-optical recording method and apparatus to be used in the method  
The invention provides magneto-optical recording method and apparatus, in which a space area on a magneto-optical recording medium is irradiated with a beam in the form of a pulse train in which a...
5854775 Magneto-optic disk recording system having improved duty ratio controller  
A magneto-optic disk recording system capable of canceling shifts of the front edge and the rear edge of the record mark due to accumulation of heat. The recording system includes a magneto-optic...
5771220 Output control apparatus of semiconductor laser device  
A recording and reproducing apparatus includes a semiconductor laser device for irradiating a light beam, a driving circuit for driving the semiconductor laser device, and an oscillation device for...
5768219 Optical information recording/reproducing apparatus that produces verifying reproduction signals by executing a computation using detection signals of multi-divided detection surfaces of a photo-detector  
An optical information recording and/or reproducing apparatus includes an irradiating device including an objective lens, having a curved surface, for irradiating a recording light beam to a...
5703841 Optical information recording/reproducing apparatus and method with function of adjusting reproducing power  
In an optical information recording/reproducing apparatus, while a magnetooptical recording medium formed by stacking at least a recording layer, which consists of a perpendicular magnetization...
5701280 Optical information recording and/or reproducing apparatus in which a reproducing light beam is modulated with at least a 100% degree of modulation  
An optical information recording and/or reproducing apparatus includes a first light source for recording or erasing information, a first current source for modulating a light beam from the first...
5684765 Optical recording method and control  
A control and method of overwrite optical recording with a first recording data transmission speed. In accordance with the method data which has been written, is verified for errors. When the...
5610879 Optical reproducing device, optical reproducing method using the same, and optical record medium used in the same  
A record medium according to the present invention includes a substrate having concave or convex information pits and a thermosensitive material film formed on the substrate. The thermosensitive...
5602806 Magneto-optical recording device capable of reducing thermal interference between recording pits  
A light intensity, direct overwrite, magneto-optical system generates signals such that, during the formation of a recording mark on an optical disk, a laser is driven a) at a pedestal power level,...
5592444 Method of writing data simultaneously on a plurality of tracks of an optical disk, and apparatus therefor  
A method of writing data simultaneously on a plurality of tracks of an optical disk, comprises providing an array of light sources, each light source being independently modulated, providing means...
5581535 Prepulse conditon/heat shut off condition determination method and apparatus for optical recording, and optical recording method and apparatus  
In an optical recording method and apparatus, the intensity of a laser beam to be radiated onto an optical recording medium is raised from an intensity P pre for maintaining a pre-heat state, in...
5561642 Pulse train condition/heat shut off condition determination method and apparatus for optical recording, and optical recording method and apparatus  
This invention relates to an optical recording method and apparatus, in which the intensity of a laser beam to be radiated onto an optical recording medium is raised from an intensity P pre for...
5553038 Magneto-optical record carrier with recording track structure suited for high density recording  
A magneto-optical record carrier having a recording track structure which enables recording with an increased information density. Information areas which are smaller than the write spot supplied...
5535179 Magneto-optic disc apparatus with signal detector for detecting recorded signals based on split beams  
In a magneto-optic disc apparatus detecting light is reflected by a recording track of a magneto-optic disc and split into a least two split beams which are received by respective sensors to detect...
5528564 Direct overwrite magneto-optic system for strip erasing and recording elongated domains  
Methods and apparatus are provided for recording, erasing and reading elongated magnetic domains on magneto-optic media using laser energy. Recording and erasing can be carried out in the absence...
5495456 Magneto-optical recording and reproducing apparatus having a laser driving circuit which superimposes a signal having a frequency at least double the maximum recording signal frequency  
A recording and/or reproducing apparatus for a magneto-optical recording medium includes a semiconductor laser device for radiating a laser beam to the magneto-optical recording medium, a driving...
5487059 Heat shut off condition determination method and apparatus for optical recording, and optical recording method and apparatus  
In an optical recording method and apparatus, the intensity of a laser beam to be radiated onto a magnetooptical recording medium is raised from an intensity P pre for maintaining a pre-heat...
5473583 Magneto-optical recording medium, recording and playback method and apparatus for the same  
A magnetooptical recording medium having a higher recording density, improved bit error rate and superior weather resistance and a recording and playback method for the same are provided. The...
5469422 Writing and erasing information by varying the temperature of an optical recording medium  
Irradiation of the optical disk medium is pulsized to achieve reading, erasing and recording with binarized read power and write power; setting of erase power is dispensed with to shorten the...
5469413 Magneto-optic recording system and associated controllable heat source  
A magneto-optic recording system writes information into a magneto-optic disc by applying a magnetic field to a selected position on the disc while directing a laser beam onto the disc. The laser...
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