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6972982 |
Ring-shaped prism of a holographic ROM system
A holographic system for storing data on an interference pattern in a hologram storage medium includes a light source for emitting a laser beam, a beam splitter, modulating means and a refractive...
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6567331 |
Avalanche breakdown memory devices and method of using the same
A reverse bias voltage in combination with selective illumination can selectively write data into optical memory. The writing process can be completed quickly since parallel writing of data may be...
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6147889 |
Device and a method for the optical recording, storage and readout of information
A high memory capacity with relatively low demands on the optical quality of the components used is possible in accordance with the invention by the means to generate the at least two light rays...
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5940314 |
Ultra-high density memory device
A ultra-high density memory device utilizing a photoinductive ferromagnetic thin film. A photoinductive ferromagnetic thin film is formed on a GaAs substrate, and a tip is arranged so as to face...
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5511035 |
Optical random access memory having diffractive simplex imaging lens
An optical memory stores data in an optical data layer capable of selecting altering light such as by changeable transmissivity. Data is organized into a plurality of regions or patches (called...
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5287300 |
Three-dimensional magnetic bubble memory system
A compact memory uses magnetic bubble technology for providing data storage. A three-dimensional arrangement, in the form of stacks of magnetic bubble layers, is used to achieve high volumetric...
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5235569 |
Magnetooptical recording method, and apparatus used in the method
A method of this invention is a non-overwritable method of recording information on a magnetooptical recording medium in which at least two layers including a first layer comprising a magnetic thin...
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5185716 |
Three dimensional combined magneto-optical memory and logic processor
A three-dimensional combined magneto-optic memory and logic processor consisting of layers of magnetic bubble material spaced from and parallel to one another. Each layer has a pattern of magnetic...
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5142491 |
Magnetic bubble recording device
Disclosed is an improved magnetic bubble recording device for optically effecting writing, reading and erasure of information with respect to magnetic bubbles. The magnetic bubble recording device...
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5119328 |
Solid state memory device
A solid state memory device has a thin film for bubble memory, a laser light source, and optical means using a laser light emitted from the laser light source to cause information to be stored in...
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5086409 |
Recording and/or reproducing method of Bloch line memory
There is disclosed a method of recording and/or reproducing in/from a Bloch line memory, including the step of: radiating or guiding a light beam to a vicinity of a distal end of a magnetic domain...
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5072421 |
Magnetic memory and recording-reproducing method for the magnetic memory
A magnetic memory has a substrate, a magnetic film provided on the substrate including a recording medium capable of producing a recording carrier, and a light waveguide layer on the magnetic film...
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4952014 |
Optical systems with thin film polarization rotators and method for fabricating such rotators
An optical system, useful as a magnetometer and as a polarization contoller, is disclosed. The system includes a source of electromagnetic radiation, a detector of electromagnetic radiation, and a...
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4937786 |
Binary hologram transducer using magnetic bubbles
A hologram transducer using the Faraday effect in magnetic bubble devices for recording and reproducing the amplitude and phase distributions over a section of a beam of coherent light is...
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4733385 |
Signal recording and reproducing apparatus for an opto-magnetic disk
A signal recording and reproducing device for use with an opto-magnetic disk having a number of concentric recording tracks. An optical head sweeps a given track at least twice during a time...
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4660173 |
Three-dimensional magnetic bubble data storage and optical retrieval system
A three-dimensional magnetic bubble memory apparatus formed of at least two arrays of sheets, with the sheets of each array being mounted in spaced and parallel relationship and with the sheets of...
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4642795 |
Thermomagnetic recording system
A region (21) having different magnetic energy from that of other portion is formed in a layer (1b) of soft magnetic material which has an easy axis of magnetization normal to the layer surface and...
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4612587 |
Thermomagnetic recording and reproducing system
A thermomagnetic recording and reproducing system for use in optical magnetic disc apparatus wherein at least a first layer (1) of soft magnetic material having an easy axis of magnetization normal...
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4581717 |
Thermomagnetic recording method
A thermomagnetic recording method is capable of recording information on a layer of soft magnetic material which has an axis of easy magnetization normal to the surface of the layer and in which...
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4578651 |
Magnetooptical modulator
In a magnetic layer of a magnetooptical modulator having fixed magnetic single domain areas, the areas of the layer present between the single domain areas are made electrically conductive by...
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4575179 |
Integrated optical signal processor using diffraction of light by magnetostatic waves
An integrated optical signal processor device. The device includes a thin film of yttrium iron garnet ferrite material formed on a gadolinium gallium garnet substrate. A guided optical beam in a...
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4550389 |
Apparatus and method for switching a magnetic domain lens
A magnetic domain device has at least one post element formed from a material that exhibits magnetic domain characteristics and that is positioned on a nonmagnetic substrate material. A pair of...
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4498153 |
Output signal detectors of magnetic bubble memory devices
In a detector of an magnetic bubble memory device of the type comprising a magnetic bubble memory element having a detector, a source of constant current for passing constant current through the...
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4497007 |
Magneto-optical storage process
This invention relates to a magneto-optical storage and playback process for travelling information carriers, by recording on a magnetizable information carrier (1) in the form of a tape, disc or...
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4466035 |
Magneto-optic media and system optimization
Magneto-optic media and system optimization including a set of optimized magneto-optic media for use in a magneto-optic recording and readout system employing an incident readout light beam of a...
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4417324 |
Magneto-optic transducer
A magnetic to optic transducer based upon magnetic bubble technology is provided. A magnetic sheet with a thin magnetic film guide pattern creating a bubble path thereon responds to external...
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4323984 |
Switching equipment using magnetic domains
A small, highly reliable and inexpensive switching equipment, in which digital signals to be switched, stored as the presence or absence of magnetic domains in a first magnetic sheet or applied as...
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4308593 |
Interchangeable magnetic bubble memory
An interchangeable magnetic bubble memory device having first and second interchangeable memory bubbles, each of the modules including a magnetic bubble memory having at least one major loop or...
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4281396 |
Magnetic strip domain memory system
A magnetic memory device in which information is stored in the form of strip domains in a layer of magnetic material supported by a layer of ferromagnetic material. The ferromagnetic material...
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4229072 |
Color display system using magneto-optic screen having a dispersive Faraday coefficient
A display system using the dispersive Faraday coefficient of a magnetic screen to obtain a color display from white light is disclosed. A beam of energy is directed upon a magnetic screen while...
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4228473 |
Pick-up device for magnetically recorded information and method and system for using same
A pick-up device for reading out information which has been recorded on a magnetic medium. The device comprises a substrate and a layer of soft magnetic material overlying a surface of the...
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4195261 |
Method and apparatus for measuring the stripe width and collapse field of magnetic materials
A method and an apparatus for characterizing magnetic materials especially LPE garnet films for magnetic bubble memory applications are described. The method and apparatus comprises in the first...
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4149265 |
Method of improving the operation of a single wall domain memory system
A method of and an apparatus for improving the selective positioning of single wall domains or bubble domains in a bubble domain memory system is disclosed. The method includes the use of slotted...
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4135195 |
Magnetographic printing apparatus
Magnetographic printing apparatus having scan magnetization of the recording surface. A bubble plate is provided adjacent the recording surface upon which bubble magnetic domains are propagated in...
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4126494 |
Magnetic transfer record film
A magnetic transfer record film employed for magneto-optically reading magnetic record patterns. The magnetic transfer record film is formed, as the principal component, of an alloy of a heavy rare...
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4123783 |
Magnetic bubble display systems
A display arrangement including a source of polarized radiation; a magnetic material capable of supporting magnetic bubble domains in the path of the polarized beam, for producing a modulated beam;...
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4120046 |
Two dimensional stretcher detector
There is described a magnetic bubble domain device particularly adapted for bubble domain detection. A bubble is supplied via a standard input propagation path, expanded to an elongated bubble...
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4012724 |
Method of improving the operation of a single wall domain memory system
A method of and an apparatus for improving the selective positioning of single wall domains or bubbles in a memory system is disclosed. The method includes the use of slotted intersecting digit and...
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4011550 |
Method of improving the operation of a single wall domain memory system
A method of improving the selective positioning of single wall domains or bubbles in a memory system is disclosed. The method includes the use of a predetermined stripline-magnetic layer separation...
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3996576 |
Optical waveguide magnetic bubble detection
A magnetic bubble detector utilizing a thin film optical waveguide. Light is optically coupled into the guide for propagation of linearly polarized light along a first axis thereof. Magnetic...
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3990059 |
Magnetic bubble detector
A magnetic bubble detector comprising a planar layer of magnetic material in which magnetic bubble domains can be moved and a thin planar film on one surface of that layer. The layer has a...
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3990037 |
Parallel access bubble memory
A parallel access magnetic bubble memory system comprising a planar thin film optical waveguide for the propagation of linearly polarized light along a first axis and a coupler for coupling light...
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3979738 |
Compound detector for magnetic domain memory devices
In a magnetic domain memory, a domain detector system includes a passive domain splitter in a domain propagation track, a first detector in the propagation track for detecting one of the domains...
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3971887 |
Dynamic magnetic bubble display system
A dynamic pattern display and optical data processing system is provided including magnetic bubble devices which may be operated in real-time to produce a multi-tone (gray scale) two dimensional...
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3965463 |
Apparatus using amorphous magnetic compositions
Apparatus using amorphous magnetic compositions having uniaxial anisotropy include bubble domain apparatus, light modulating apparatus, permanent magnet systems, and tape and disc information...
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3911411 |
Magnetic domain systems using different types of domains
A magnetic bubble domain system using dual size bubble domains which can exist in a magnetic sheet at the same time, and which can be manipulated without changing their character. Additionally,...
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3905040 |
Magnetic domain storage disk
A storage system uses a plate of magnetic material having a two-dimensional regular array of positions in which a domain can each time be written and read by light radiation. The plate rotates at a...
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3902166 |
Memory apparatus using cylindrical magnetic domain materials
This invention relates to an electric apparatus using magnetic materials, comprising plural magnetic thin platelets provided with means for producing cylindrical magnetic domains in the...
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3899780 |
Magnetic bubble store having optical centering apparatus
A storage system comprising a plate of magnetic material with a two-dimensional regular array of positions. A domain can be written and read in each of said positions by means of electromagnetic...
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3899779 |
Magnetic bubble domain system using different types of domains
A magnetic bubble domain system using different types of magnetic bubble domains for representation of information. Different domain types are characterized by different numbers of vertical Bloch...
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