Matches 351 - 400 out of 699 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >
Match Document Document Title
5757763 Optical information storage via amplitude modulation  
A system for three-dimensionally storing and encoding information in an optical storage medium. Information at a surface location is encoded according to the surface depth or width of the location....
5754523 Optical memory medium with preformed pit arrangement  
In an optical memory medium comprising prepits on which a light spot is impinged to obtain information and, if required, guide grooves: each of those among the prepits which are longer than the...
5751689 Information recording medium  
An information recording and reproducing method and apparatus with increased recording density of an information recording medium using the sample servo method driven with a fixed angular velocity...
5751670 Magneto-optical disk having variable thickness recording layer but adequate uniform reflectance value  
A magneto-optical disc includes a disc-shaped transparent substrate, a recording layer formed on the substrate for extending from an inner diameter to nearly an outer most diameter, and an outer...
5748572 Magneto-optical recording apparatus with an optical element providing a high C/N ratio  
An optical element for a magneto-optical recording apparatus which has a light receiving face on which light is incided, this light being reflected or transmitted on or through a magneto-optical...
5742582 Disk medium and method of writing data onto the disk medium  
A invention relates to a disk medium and a method of writing data onto the disk medium. The disk medium is formatted in such a manner that: there are provided a plurality of track zones formed into...
5741603 Optical disc  
An optical disc comprising transparent substrate, a phase-changing material layer disposed on the transparent substrate and made of a material which is phase-changeable by radiation of a light...
5737306 Playback system for an optical disc presenting a character or a graphic pattern formed by specified pit patterns on data tracks  
A CD-ROM is provided with an area for forming a character/graphic pattern. The character/graphic pattern is formed in such a way that data, which generate on the CD-ROM two sorts of pit patterns...
5732065 Optical information carrier including standard and high density layers  
A record carrier having standard and high-density information layers. The standard density layer, e.g. in a standard CD format, is positioned at the bottom of a substrate, and is read out through...
5718960 Bonded composite disk, and method and apparatus for producing the same with consistent adhesive thickness  
Method and apparatus for forming a first and a second component disk which are bonded together to produce a bonded composite disk, wherein a first mold for forming the first component disk includes...
5717682 Optical disk having information pits of different lengths and shapes  
An optical disk includes: an information recording surface on which a laser light is irradiated; and information pits arranged on the information recording surface and including a plurality of...
5708653 Single-substrate multi-layer optical disk for read-only storage and phase change rewritable storage  
An optical disk includes a transparent rigid substrate, a phase change rewritable optical recording medium formed on the transparent rigid substrate, a transparent spacer formed on the phase change...
5700540 Optical recording medium  
An optical recording medium comprising a substrate with grooves, a surface smoothing layer less than 1 μm thickness deposited on the grooved substrate, and a recording layer. The medium reduces...
5689497 Optical registration medium with dual information layer  
A read-only optical registration medium which successively includes: a transparent substrate; a first registration surface containing localized level variations representing binary data bits;...
5687394 Auxiliary storage apparatus capable of transferring bootstrap programs using variable access sizes  
An auxiliary storage apparatus connected through an interface means to a computer to access data from a storage medium includes access means for accessing the storage medium at the unit of...
5675570 Optical disc having indication portion  
An optical disc is provided with: a disc substrate of light transmissive type having an information record surface including an information recorded region, where pits or grooves carrying an...
5673251 Two substrates bonding type optical disk and method of producing the same  
This optical disk is two-substrates bonding type. In the optical disk, from the first transparent substrate side toward the second substrate side, at least following layers are laminated in that...
5671211 Data recording medium  
A data recording medium having a well-recognizable recording layer which reversibly changes in degree of light scattering when externally stimulated. One embodiment of the data recording medium of...
5666344 Multiple data surface optical data storage system  
An optical data storage system comprises a multiple data surface medium and optical head. The medium comprises a plurality of substrates separated by a light transmissive medium. Data surfaces are...
5666345 Optical memory medium with predetermined guide tracks and prepits  
An optical memory disc medium contains a plurality of guide groove tracks. The guide groove tracks are arranged parallel to each other and they are used for controlling a position of a light beam....
5661716 Magneto-optical recording medium and reproducing method therefor  
A magneto-optical recording medium includes a substrate, a first magnetic layer formed on the substrate and constituted by a perpendicular magnetization film, a dielectric layer formed on the first...
5659536 Optical storage method and device for storing and reading digital information  
Disclosed is a system for the recording of data on optic disks. Presently used optic disks, which can be read with lasers working in wavelengths of the visible region (between 0.5 and 0.8 microns),...
5654953 Optical disk and method of manufacturing the same  
The present invention relates to an optical disk and a method of manufacturing the same, and, more particularly, to an optical disk which can ensure high-density recording and a method of...
5650992 Phase change optical disc  
A phase change optical disk 10 is disclosed, which comprises a first dielectric layer 14, a recording layer 16, a second dielectric layer 18, a reflective layer 20, a third dielectric layer 22, and...
5648134 Thermal recording medium capable of keeping width of mark train constant and recording method for the same  
Recording or erasing on a thermal recording medium is performed such a manner that a local region of a recording film on the recording medium is heated to a predetermined temperature to reversibly...
5646924 Recording and simultaneous verifying method of phase-changing type of information recording medium  
An intensity of light reflected on a phase-changing type of information recording medium is changed since unrecorded and recorded portions of the recording medium have different phase states so...
5645908 Multi-layer optical recording device  
A multi-layer optical recording medium having a first reflecting film next to an optical incident surface, and a plurality of reflecting films having different optical reflecting characteristics...
5645909 Optical recording medium and method for forming same  
An optical recording medium for a land & groove recording method capable of suppressing crosstalk and cross-erase (increase of jitter) upon increasing the capacity by the increase of track density,...
5644565 Optical recording medium including a plurality of diffracted grating cells  
In an optical information recording medium of this invention, at least one cell including diffraction gratings is disposed on a planar substrate. This cell is divided into n (n is an integer of 2...
5640382 Dual layer optical medium having partially reflecting metal alloy layer  
A dual layer pre-recorded optical disc includes a transparent substrate, a partially reflective layer, a transparent spacer layer, and a highly reflective layer. One pattern of data pits is...
5638355 Optical information reproducing by detecting phase shift of elevated symbols  
Digital information is represented by surface designs with features smaller than the wavelength of the reading light on the surface of a record carrier, said designs producing continuously varying...
5636201 Optical disk memory for recording reproducible information  
This optical disk comprises neighboring land tracks and a groove track laid therebetween. Light modulating regions are formed in said land tracks and each of the light modulating regions extends in...
5631056 Optical recording medium  
There is disclosed an optical recording medium for high density recording without degradation of reproducing output signals. The optical recording medium includes a transparent substrate made of...
5631895 Optical information recording medium  
An optical information recording medium includes a transparent substrate, a first protection film, a recording film, a second protection film, a dielectric film, and a dielectric reflective film....
5629917 Integrated optical pick-up emits light beams of selective wavelengths to an optical disk with multiple data layers  
An integrated optical pick-up device includes a laser source which emits incoherent laser consist of varied wavelength in wide spectrum, and an optical filter which eliminates improper ranges of...
5627816 Multilayer optical disk and apparatus  
A multi-layer optical disk includes a plurality of recording layers and each recording layer is composed of a first layer and a second layer having respective transmission indices of T1A and T2A...
5627817 Optical disk data storage system with multiple write-once dye-based data layers  
A multiple data layer dye-based optical disk drive uses a disk with a light transmissive substrate onto which the laser light at a single wavelength is incident. The disk substrate supports at...
5625609 Multiple data layer optical disk drive system with fixed aberration correction and optimum interlayer spacing  
A multiple data layer optical disk drive system has fixed aberration correction and uses a disk with maximum interlayer spacing for reduced interlayer crosstalk. In one embodiment the multiple data...
5625619 Optical recording medium having a plurality of different diffraction grating cells  
In an optical information recording medium of this invention, at least one cell including diffraction gratings is disposed on a planar substrate. In accordance with exemplary embodiments, a ratio...
5625618 Optical recording medium employing an intermittent pattern for guiding tracks and tracking apparatus for the same  
An optical recording medium has a track format with a track pitch smaller than a diffraction limit of a light spot so as to realize an increased capacity and a higher density. A guide groove for...
5620792 Magneto-optic recording medium having constant reflectance over a range of wavelengths  
A multilayer medium comprising a substrate, a composite dielectric layer, a magneto-optic recording layer, another dielectric layer, and a reflective layer. The composite dielectric layer has two...
5618638 Optical magnetic recording medium  
An optical-magnetic recording medium comprising a tracking guide layer and a recording layer disposed on a substrate in which the recording layer is made of a magnetic material having a certain...
5617405 Optical recording medium having at least two separate recording layers of different writing temperatures  
An optical storage device comprising at least two spaced apart recording layers, a spacer layer separating by being positioned between alternating recording layers, and each recording layer...
5616390 Optical recording medium permitting detection of identification signals in land areas and groove areas, optical information recording/reproducing apparatus and apparatus for producing an original disk for forming a disk substrate  
An optical information recording medium is configured so that grooves and lands formed spirally or concentrically on a disk substrate are used as recording tracks. Identification signal areas are...
5617380 Apparatus and method for drive management for multi-pass storage devices  
An optical recording system writes data on an optical disk that has a user data area having a plurality of sectors and that has a map having first and second indicators corresponding to a portion...
5610901 Multiple data surface optical data storage system  
An optical data storage system comprises a multiple data surface medium and optical head. The medium comprises a plurality of substrates separated by a light transmissive medium. Data surfaces are...
5608717 Information recording media and optical disc presenting a character or a graphic pattern formed by specified pit patterns on data tracks  
A CD-ROM is provided with an area for forming a character/graphic pattern. The character/graphic pattern is formed in such a way that data, which generate on the CD-ROM two sorts of pit patterns...
5608715 Multi-layered recording disk and recording/reproducing system using the same  
A multi-layered disk which can improve a data recording density and also can record signals and allow reading and reproduction of the recorded signals in good conditions and a recording system as...
5607739 Temperature sensor and method for optical disk  
An optical disk is disclosed which includes a substrate and a reflector layer disposed on the substrate. At least one temperature sensitive layer disposed on the reflector layer, the sensor...
5606546 Optical data storage medium with multiple writable data layers separated by dieletric layers  
An optical data storage system comprises a multiple data surface medium and optical head. The medium comprises a plurality of substrates separated by a light transmissive medium. Data surfaces are...
Matches 351 - 400 out of 699 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >