Masahiro Ojima
39Patents
18h-index
74Co-inventors
84Inventor score
Filing activity: Sep 17, 1979 → Aug 30, 2001
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4908813A | Wavelength multiplexing optical recording apparatus | Physics | 76 | Expired |
| US4357616A | Recording medium | Emerging Cross-Sectional Technologies | 48 | Expired |
| US4901325A | Semiconductor laser device | Electricity | 45 | Expired |
| US4894816A | Optical information recording apparatus | Physics | 45 | Expired |
| US4333173A | Optical information processor with prismatic correction of laser beam shape | Physics | 44 | Expired |
| US5737467A | Resin molded optical assembly | Physics | 43 | Expired |
| US4712203A | Method and apparatus for thermo magnetic recording/erasing information with preselected magnetic field switching | Physics | 35 | Expired |
| US4410277A | Apparatus for detecting magneto-optical anisotropy | Physics | 34 | Expired |
| US5245491A | Magneto-optical head employing optical fiber connected stationary and movable portions | Physics | 32 | Expired |
| US4984231A | Optical information phase change recording medium having double protective layer | Emerging Cross-Sectional Technologies | 31 | Expired |
| US4985881A | Record carrier for a magneto-optical disc memory having guide grooves of a plurality of tracks disposed with a predetermined relation to light spot diameter | Physics | 31 | Expired |
| US5020041A | Magneto-optical memory apparatus having a floating magnetic head | Physics | 28 | Expired |
| US5043960A | Overwritable magneto-optic recording and reproducing apparatus | Physics | 24 | Expired |
| US4571650A | Magneto-optic information storage system utilizing a self-coupled laser | Physics | 23 | Expired |
| US5235591A | Stack type optical disc apparatus, sealed and separate type optical head therefor and optical disc medium | Physics | 21 | Expired |
| US4672594A | Magneto-optical recording system utilizing a leakage magnetic field of focusing actuator | Physics | 19 | Expired |
| US5270987A | Magneto-optical recording and reproducing method, magneto-optical memory apparatus and magneto-optical recording medium therefor | Physics | 18 | Expired |
| US4480325A | Optical pickup | Physics | 18 | Expired |
| US4672593A | Optical head with improved extinction ratio for magneto-optical memory | Physics | 15 | Expired |
| US6731846B2 | Dispersion compensator and optical transmission system using same | Physics | 13 | Expired |
| US5408452A | Optical information recording/reproducing system including novel tracking system | Physics | 12 | Expired |
| US4982389A | Magneto-optical recorder with compensation for variation in applied magnetic field intensity on a recording medium | Physics | 12 | Expired |
| US5293567A | Optical recording method | Physics | 10 | Expired |
| US4712218A | Method of and apparatus for driving semiconductor laser | Electricity | 9 | Expired |
| US5644554A | Magnetic head load/unload device, method and a magneto-optical disk apparatus using the same | Physics | 8 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.