Patents
Sitemap › G11 - Information storage › G11B - Information storage based on relative movement between record carrier and transducer › G11B 11 - Recording on, or reproducing from, the same record carrier wherein for these two operations the methods or means are covered by different main groups of groups or by different subgroups of group; Record carriers therefor
Patents for G11B 11 - Recording on, or reproducing from, the same record carrier wherein for these two operations the methods or means are covered by different main groups of groups or by different subgroups of group; Record carriers therefor (14,351)
12/1990
12/04/1990US4975339 Magneto-optical recording medium with at least one protective layer containing platinum and/or palladium
12/04/1990US4975336 Transparent substrate coated with an alloy of manganese, bismuth, aluminum and silicon; large signal/noise ratio
12/03/1990WO1990015409A1 Magnetic field modulation control circuit for recording a magneto-optic memory
12/03/1990CA2033344A1 Magnetic field modulation control circuit for recording data into a magneto-optic memory
12/02/1990CA2018057A1 Recording medium, recording and reproducing device and recording process
11/1990
11/28/1990EP0399978A2 Method and apparatus for overwriting data on a magneto-optic disk
11/28/1990EP0399853A2 Recording and reproducing device
11/28/1990EP0399852A2 Recording/reproducing device
11/28/1990EP0399689A2 Magneto-optical disc recording apparatus
11/28/1990EP0399650A2 Wedge prism assembly for optical information storage
11/28/1990EP0399532A2 Information recording media
11/28/1990EP0156916B1 Photomagnetic recording and reproducing apparatus having device for detecting direction of magnetization of magnetic recording medium
11/27/1990US4974219 Polarizing beam splitter using dielectric multilayers
11/27/1990CA1277028C Optical disc and disc drive apparatus for writing/reading data into/from the disc
11/23/1990CA2017226A1 Information recording media
11/22/1990EP0398662A2 Process for manufacturing a magneto-optic disc, and a magneto-optic disc manufactured by such a process
11/22/1990EP0398656A2 Electric charge image recording medium and recording/reproducing apparatus
11/22/1990DE4014107A1 Construction of magnetic layer memories and substrates - uses organically modified silicate(s) or organically modified ceramics
11/21/1990CN1047159A Information recording system, and recording device and record carrier for use in such an information recording system
11/21/1990CN1047158A Information recording media
11/20/1990US4972395 Opto-magnetic recording apparatus for sequentially driving optical head drive means and biasing magnetic field generation means
11/20/1990US4972344 Dual beam optical turntable
11/20/1990US4972337 Device for controlling rotation of a magnet used in a magneto-optical recording system
11/20/1990CA1276722C Optical recording disc
11/14/1990EP0397238A1 Information recording system, and recording device and record carrier for use in such an information recording system
11/07/1990EP0395832A2 Optical head
10/1990
10/24/1990EP0393978A2 Optical information recording-reproducing apparatus
10/24/1990EP0393719A2 Signal reproducing apparatus for optical recording and reproducing equipment and method for the same
10/24/1990EP0393652A2 Magneto-optical recording and reproducing method, magnetooptical memory apparatus
10/24/1990EP0393576A2 Information recording media
10/23/1990US4965784 Method and apparatus for bistable optical information storage for erasable optical disks
10/23/1990US4965780 Magneto-optical data recording device using a wavelength and polarization-sensitive splitter
10/23/1990US4965178 Optical recording medium
10/17/1990EP0393001A2 Method and apparatus for operating a disk recorder
10/17/1990EP0392777A2 Track access control system in rotating disc devices with eccentricity correction
10/17/1990EP0392020A1 Magnetooptical recording apparatus
10/17/1990CN1046240A Magnetooptical reocrding media and initialization methods thereof
10/17/1990CN1046226A Optical recording medium and method for making same
10/16/1990US4964110 Apparatus for reproducing a magneto-optical disk using a shot noise reduction circuit
10/11/1990DE3911525A1 Circuit for detecting the type of an optical recording carrier
10/10/1990EP0391738A2 Magneto-optic memory medium
10/10/1990EP0391734A2 Magnetooptical recording media and initialization methods thereof
10/10/1990EP0391588A2 Disc cartridge
10/10/1990EP0391423A2 Optical recording medium and method of making same
10/09/1990US4962493 Record carrier with a follow-on track and apparatus for recording information thereon
10/09/1990US4962492 Magneto-optic data recording system, actuating device therefor and method of providing same
10/09/1990US4962480 Memory reading apparatus
10/06/1990CA2013897A1 Magnetooptical recording media and initialization methods thereof
10/06/1990CA2013867A1 Optical recording medium and method for making same
10/04/1990WO1990011602A1 Magnetooptical medium
10/04/1990DE4009843A1 Magneto=optical record carrier - has magnetic thin film on dielectric layer which prevents corrosion of ferromagnetic thin film in air
10/03/1990EP0390610A2 Optical element and optical pickup device comprising it
10/03/1990EP0390584A2 Photomagnetic composite head
10/03/1990EP0390470A2 Storage medium, storage method and stored information reading method
10/03/1990EP0390263A1 Device for inscribing and/or reading a magneto-optical information carrier
10/03/1990EP0390260A1 Device for inscribing and/or reading a magneto-optical information carrier
10/03/1990EP0390259A1 Device for inscribing and/or reading a magneto-optical information carrier
10/03/1990EP0390221A2 Magneto-optical recording apparatus
10/03/1990EP0390171A2 Electrostatic latent image recording/reproducing device
10/02/1990US4961182 Information retrieving system with level clamping
10/02/1990US4961178 Method of erasable recording and reading of information
09/1990
09/27/1990DE4009148A1 Magnetic, optical recording medium - has outstanding corrosion stability and accommodates disk revolution temperature ranges
09/26/1990EP0389297A1 A spin glass magnetic body, a magnetic recording medium and a magnetic recording apparatus
09/26/1990EP0388852A2 Magneto-optical recording medium and process for production of the same
09/26/1990EP0388452A1 Connectorless hermetic optical disk system
09/25/1990US4959821 Optical pick-up for scanning a magneto-optically recorded medium
09/25/1990US4959820 Magnetooptical recording apparatus with constant leakage magnetic and pulse modulated magnetic field
09/25/1990US4959243 Production of a sheet-like, multilayer magneto-optical recording material
09/25/1990US4959136 Method for making an amorphous aluminum-nitrogen alloy layer
09/20/1990WO1990010892A1 Electrostatic data recording medium and electrostatic data recording/reproducing method
09/20/1990DE3908634A1 Magneto-optical data disc
09/20/1990CA2028814A1 Electrostatic information recording medium and electrostatic information recording and reproducing method
09/19/1990EP0388213A2 Recording-reproducing apparatus and recording-reproducing method
09/19/1990EP0387866A2 Method and apparatus for the reproduction of magnetically stored information
09/19/1990EP0387420A2 Magneto-optical recording medium
09/18/1990US4957824 Magneto-optical recording, rare earth-transition metal alloy, surface hydrogenation
09/18/1990US4957604 Corrosion resistance, magneto-optical recording media
09/18/1990US4957549 Rare earth metal-iron group metal target, alloy powder therefor and method of producing same
09/12/1990EP0387224A2 Position servo system and its method of operation
09/12/1990EP0387052A2 Magneto-optical recording apparatus having means for delaying an input signal for preventing bit shift
09/12/1990EP0387050A2 Magneto-optical disk inspecting method and apparatus
09/12/1990EP0387047A2 Magneto-optical recording apparatus
09/11/1990US4956714 Image pickup apparatus
09/11/1990US4956243 Optical memory element
09/11/1990US4956214 Information recording medium, production process and molding die for substrate therefor
09/07/1990WO1990010291A1 Re-usable information recording sheet material
09/07/1990WO1990010290A1 Circuit arrangement for reversing a magnetic field
09/05/1990EP0385786A1 Magnetooptical recording medium
09/05/1990EP0385701A2 Apparatus for reproducing information from an opto-magnetic recording medium
09/05/1990EP0385500A2 Optical head
09/05/1990EP0385337A2 Method for reproducing information which is recorded in thin polymer films
09/05/1990EP0385109A2 Shaped article for optical uses
09/04/1990WO1990010916A2 Erasable optical wallet-size data card
09/04/1990US4955007 Thermomagnetic recording method applying power modulated laser on a magnetically coupled double layer structure of perpendicular anisotropy film
09/04/1990US4955006 Floating type magneto-optic disk reading head system having external semiconductor laser resonator operating at orthogonal two mode oscillations
09/04/1990US4954841 Transparent resin, adhesive, and protective coating
09/04/1990US4954232 Magneto-optical recording element and method for fabrication thereof
09/04/1990CA1273489A1 Method for manufacturing a magneto-optical recording medium
09/02/1990CA2011243A1 Reading out information stored in thin polymer layers
08/1990
08/29/1990EP0384746A2 Over write capable magnetooptical recording medium
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