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Class Information
Number: 360/59
Name: Dynamic magnetic information storage or retrieval > General recording or reproducing > Thermomagnetic recording or transducers
Description: Subject matter including changing the coercivity of a record carrier by applying heat thereto in proportion to an information signal or in addition to a magnetic field which is proportional to an information signal.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5168483 |
Magnetic head position control apparatus including drive means responsive to a summed signal from a capacitance detection electrode and a disk size detector means |
Dec. 1, 1992 |
| 5168484 |
Magnetic head lifting device for magneto-optical recording/reproducing apparatus including drive means responsive to a PLL circuit |
Dec. 1, 1992 |
| 5166913 |
Optical disk device for record and reproduction of additional information besides reproducing of basic information |
Nov. 24, 1992 |
| 5164926 |
Over-write capable magnetooptical recording medium with four magnetic layered structure dispensing with external initializing field |
Nov. 17, 1992 |
| 5163031 |
Method of recording tetra-value signal on magneto-optical recording medium with plural magnetic layers |
Nov. 10, 1992 |
| 5163032 |
Magneto-optical recorder with servo control system for a magnetic-field modulation system |
Nov. 10, 1992 |
| 5161132 |
Magneto-optical recording apparatus including a magnetic head of a pneumatic floating type |
Nov. 3, 1992 |
| 5161135 |
Magneto-optical disc memory apparatus including a header signal and magneto-optical signal level adjusting circuit |
Nov. 3, 1992 |
| 5161133 |
Magneto-optical storage system |
Nov. 3, 1992 |
| 5159584 |
Bias-Magnetic field generating system of photo-magnetic recording device |
Oct. 27, 1992 |
| 5157641 |
Apparatus for generating a magnetic biasing field for recording in a magneto-optical recording medium |
Oct. 20, 1992 |
| 5155714 |
Interleaving method for interleaved magneto-optic recording of a track |
Oct. 13, 1992 |
| 5153860 |
Optical pickup apparatus for detecting and correcting focusing and tracking errors in detected recorded signals |
Oct. 6, 1992 |
| 5148415 |
Magneto-optical disc apparatus having head-disc distance control |
Sep. 15, 1992 |
| 5144601 |
Magneto-optical overwriting methods using erasing pulses, each of which has a higher frequency and narrower width than that of the overwriting pulses |
Sep. 1, 1992 |
| 5142513 |
Magneto-optical storage medium and magneto-optical overwrite system with magnetic characteristic change by variation of thermal condition for recording information |
Aug. 25, 1992 |
| 5140569 |
Magneto optical recording system with a laser mounted on a slider |
Aug. 18, 1992 |
| 5140566 |
Optical data recording and playback system |
Aug. 18, 1992 |
| 5132945 |
Magnetooptical recording medium allowing overwriting with two or more magnetic layers and recording method utilizing the same |
Jul. 21, 1992 |
| 5130958 |
Method of and apparatus for overwritting a magneto-optic disk |
Jul. 14, 1992 |
| 5128910 |
Magnetooptical recording method and apparatus used therefor |
Jul. 7, 1992 |
| 5126986 |
Over write capable magnetooptical recording medium, recording method and apparatus using the same |
Jun. 30, 1992 |
| 5126985 |
Method of recording information on a record carrier of the thermomagnetic type, and device for carrying out the method |
Jun. 30, 1992 |
| 5126984 |
External magnetic field generating device for optical magnetic disk apparatus |
Jun. 30, 1992 |
| 5126983 |
Apparatus for optically recording information on opto-magnetic record medium having a minimized leakage magnetic field |
Jun. 30, 1992 |
| 5111441 |
Apparatus for generating magnetic field varying in response to an information signal |
May. 5, 1992 |
| 5105400 |
Method of magneto-optically recording and erasing information onto a magneto-optical information storage medium |
Apr. 14, 1992 |
| 5103351 |
Multiple core magnetic head for magneto-optical recording apparatus |
Apr. 7, 1992 |
| 5101385 |
Magneto-optical information storage system for flexible media having maximum overwrite efficiency |
Mar. 31, 1992 |
| 5095470 |
Capacitance detection control circuit for positioning a magnetic head close to a magneto-optical disk |
Mar. 10, 1992 |
| 5093822 |
High-density magnetic recording and optical reproducing apparatus |
Mar. 3, 1992 |
| 5093817 |
Method and apparatus for recording information on an opto-magnetic recording medium by applying a modulated light beam while applying a magnetic field alternating with a constant period |
Mar. 3, 1992 |
| 5091897 |
Magneto-optical recording apparatus having means for delaying an input signal for preventing bit shift |
Feb. 25, 1992 |
| 5091896 |
Method and apparatus for magneto-optical recording using a demagnetization field and erasing using external magnetic field |
Feb. 25, 1992 |
| 5088074 |
Magnetooptical recording apparatus with parts arranged to minimize height |
Feb. 11, 1992 |
| 5073888 |
Optical pickup device |
Dec. 17, 1991 |
| 5072432 |
Magnet turn-over mechanism for recording and/or erasing an information on and from a magneto-optical disk by selectively applying a first and a second predetermined magnetic fields |
Dec. 10, 1991 |
| 5072431 |
Magneto-optical disk recording apparatus |
Dec. 10, 1991 |
| 5070487 |
Magneto-optic media recording system including a directed magnetic bias flux |
Dec. 3, 1991 |
| 5065377 |
Method of and apparatus for writing and reading a magneto-optical record carrier with an information density greater than that corresponding to the size of the scanning spot |
Nov. 12, 1991 |
| 5051970 |
Magneto-optic recording system with overwrite capability |
Sep. 24, 1991 |
| 5043960 |
Overwritable magneto-optic recording and reproducing apparatus |
Aug. 27, 1991 |
| 5038330 |
Bias magnetic field impress apparatus for opto-magnetic disk apparatus including permanent magnet |
Aug. 6, 1991 |
| 5034934 |
Opto-magnetic disk unit with improved dynamic range characteristics and opto-magnetic disk therefor |
Jul. 23, 1991 |
| 5027334 |
Magneto-optical disk device with movable coil |
Jun. 25, 1991 |
| 5025430 |
Magneto-optic recording and reproducing apparatus including a multiple layer recording medium having a premagnetized bias layer replacing an external bias magnetic |
Jun. 18, 1991 |
| 5022017 |
Magneto optic data recording system with variable field strength, actuator therefor and method of providing |
Jun. 4, 1991 |
| 5022018 |
System for applying a perpendicular magnetic field to the illuminated side of a magneto-optic medium |
Jun. 4, 1991 |
| 5020040 |
Overwriting system for magneto-optical recording with self timing track |
May. 28, 1991 |
| 5020042 |
Apparatus for selectively inverting a magnetic bias field using a rod-shaped permanent magnet surrounded with an electrically conductive damping means |
May. 28, 1991 |
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