Inventor
YASUOKA HIROSHI
JP11 patents
⚠️ This page may combine multiple inventors who share the name “YASUOKA HIROSHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
9 patentsUS5574881ANov 12, 1996
High capacity data storage method and system using independently controlled heads and circuitry for monitoring access frequency of data records
HITACHI LTD28 citations92
US5235591AAug 10, 1993
Stack type optical disc apparatus, sealed and separate type optical head therefor and optical disc medium
HITACHI LTD27 citations92
US5109374AApr 28, 1992
Small-sized optical memory device and information processing apparatus utilizing cylindrically shaped information recording medium
HITACHI LTD28 citations92
US4984231AJan 8, 1991
Optical information phase change recording medium having double protective layer
HITACHI LTD42 citations92
US5257256AOct 26, 1993
Recording waveform for mark-length modulation optical recording
HITACHI LTD18 citations74
US5084857AJan 28, 1992
Information recording method using a modulated recording beam at high, intermediate and low power levels
HITACHI LTD8 citations74
US5038338AAug 6, 1991
Recording waveform for mark-length modulation optical recording
HITACHI LTD11 citations74
US5404348AApr 4, 1995
Method for recording and reproducing information using at least two energy beams
HITACHI LTD8 citations72
US4982396AJan 1, 1991
Information recording medium and apparatus using reversible phase change
HITACHI LTD5 citations63