Inventor
YOSHIHIRO MASAFUMI
JP23 patents
⚠️ This page may combine multiple inventors who share the name “YOSHIHIRO MASAFUMI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI MAXELL
21 patentsUS6160769ADec 12, 2000
Optical recording medium and optical recording device
HITACHI MAXELL51 citations96
US6101153AAug 8, 2000
Magnetic head capable of generating multi-stepped external magnetic fields for magneto-optical recording device
HITACHI MAXELL62 citations95
US6434088B1Aug 13, 2002
Recording and reproducing apparatus having a magneto-optical head with an objective lens and laser-beam-permeable member
HITACHI MAXELL19 citations92
US6385141B1May 7, 2002
Magneto-optical recording method capable of adjusting the sizes magnetic domain
HITACHI MAXELL18 citations92
US6246640B1Jun 12, 2001
Magneto-optical recording medium capable of recording multiple value signals
HITACHI MAXELL25 citations92
US6061307AMay 9, 2000
Magneto-optical recording medium having a plurality of magnetic layers
HITACHI MAXELL21 citations92
US6044041AMar 28, 2000
Recording and reproducing apparatus having a magneto-optical head with an objective lens and laser-beam-permeable member
HITACHI MAXELL23 citations92
US5783320AJul 21, 1998
Magneto-optical recording medium and process for producing the same
HITACHI MAXELL18 citations92
US6424601B1Jul 23, 2002
Magneto-optical recording media having an auxiliary magnetic layer
HITACHI MAXELL22 citations91
US6477118B1Nov 5, 2002
Method and apparatus for recording and reproducing information by applying field in a direction other than the direction of magnetization or the direction to a surface of an information recording medium
HITACHI MAXELL28 citations90
US6556516B1Apr 29, 2003
Reproducing method and reproducing apparatus for magneto-optical recording medium using different radiation patterns
HITACHI MAXELL13 citations84
US6388954B1May 14, 2002
Magneto-optical recording medium having clock-marks on recording layer and apparatus for recording and reproducing same
HITACHI MAXELL18 citations83
US6693854B2Feb 17, 2004
Reproducing method and reproducing apparatus for magneto-optical recording medium
HITACHI MAXELL11 citations74
US6226234B1May 1, 2001
Magneto-optic recording medium and reproducing method for reproducing magnetic domain in enlarged form on a reproducing layer
HITACHI MAXELL7 citations74
US6366541B1Apr 2, 2002
Optical recording medium with solid protective layer having self-lubricating property
HITACHI MAXELL13 citations73
US5965286AOct 12, 1999
Magneto-optical recording medium
HITACHI MAXELL5 citations73
US5637411AJun 10, 1997
Magneto-optical recording medium and process for producing the same
HITACHI MAXELL11 citations73
US6584044B2Jun 24, 2003
Magneto-optical recording apparatus using multiple magnetic field strengths for recording different mark lengths
HITACHI MAXELL3 citations62
US5639563AJun 17, 1997
Magneto-optical recording medium
HITACHI MAXELL5 citations62
US6385140B2May 7, 2002
Magneto-optical recording medium and reproducing method for reproducing magnetic domain in enlarged form on a reproducing layer
HITACHI MAXELL1 citations52
US5590097ADec 31, 1996
Magnetooptic recording medium
HITACHI MAXELL3 citations52
HITACHI LTD
2 patentsUS6567348B1May 20, 2003
Method for recording mark length shorter than channel bit length on magneto-optical medium
HITACHI LTD13 citations83
US5315577AMay 24, 1994
Optical recording/reproducing by changing perpendicular magnetic anisotropy to non-perpendicular magnetic anisotropy
HITACHI LTD6 citations62