Inventor
YONEZAWA SEIJI
JP48 patents
⚠️ This page may combine multiple inventors who share the name “YONEZAWA SEIJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
44 patentsUS5959943ASep 28, 1999
Information recording medium with clock information therein
HITACHI LTD69 citations96
US5150339ASep 22, 1992
Optical disk medium and its application method and system
HITACHI LTD87 citations96
US4866688ASep 12, 1989
Composite tracking servo system for optical disc apparatus with track offset correction
HITACHI LTD111 citations96
US4791627ADec 13, 1988
Wobbled pit recording method and device of optical recording medium utilizing a plurality of time different signal waveforms
HITACHI LTD77 citations96
US4748609AMay 31, 1988
Method and apparatus for composite tracking servo system with track offset correction and rotary optical disc having at least one correction mark for correcting track offset
HITACHI LTD119 citations96
US4707816ANov 17, 1987
Method and apparatus for composite wobbled and push-pull tracking servo system
HITACHI LTD98 citations96
US4357616ANov 2, 1982
Recording medium
HITACHI LTD72 citations96
US4333173AJun 1, 1982
Optical information processor with prismatic correction of laser beam shape
HITACHI LTD61 citations96
US5296995AMar 22, 1994
Method of magnetically recording and reading data, magnetic recording medium, its production method and magnetic recording apparatus
HITACHI LTD58 citations95
US5348837ASep 20, 1994
Projection exposure apparatus and pattern forming method for use therewith
HITACHI LTD73 citations94
US5134426AJul 28, 1992
Optical device for generating pattern having uniform light intensity distribution
HITACHI LTD29 citations93
US4759628AJul 26, 1988
Wavelength scanning interferometry and interferometer employing laser diode
HITACHI LTD25 citations93
US4785442ANov 15, 1988
Light spot position control system and method by sampling servo
HITACHI LTD38 citations92
US4703408AOct 27, 1987
Apparatus and record carrier for optically writing information
HITACHI LTD27 citations92
US4564929AJan 14, 1986
Information recording and reproducing apparatus with tracking control by sampling
HITACHI LTD30 citations92
US4392219AJul 5, 1983
Method and device for recording and reproducing tracking information
HITACHI LTD33 citations92
US4748611AMay 31, 1988
Information recording medium and method for reproducing the same
HITACHI LTD29 citations89
US4067044AJan 3, 1978
Information recording and retrieval apparatus
HITACHI LTD59 citations89
US5170383ADec 8, 1992
Magneto-optical data recording system
HITACHI LTD13 citations82
US4949325AAug 14, 1990
Method and associated apparatus and medium for optical recording and reproducing information
HITACHI LTD22 citations82
US4857744AAug 15, 1989
Optical projection printing apparatus wherein wafer mark has a grating pitch in the sagittal plane of the first optical system
HITACHI LTD22 citations82
US4411500AOct 25, 1983
Optical system for reproducing information
HITACHI LTD22 citations82
US4364118ADec 14, 1982
Optical disk and optical information processor
HITACHI LTD24 citations82
US4238803ADec 9, 1980
Information recording methods using lasers
HITACHI LTD27 citations82
US5886958AMar 23, 1999
Information recording apparatus and method for modulated magneto-optical recording medium
HITACHI LTD3 citations74
US5726955AMar 10, 1998
Magneto optical recording medium apparatus and method utilizing light pulse magnetic modulation recording
HITACHI LTD4 citations74
US5473581ADec 5, 1995
Magneto-optical data recording system continuously irradiating optical pulsers
HITACHI LTD7 citations74
US4872152AOct 3, 1989
Light spot position control system and method by sampled servo
HITACHI LTD18 citations74
US4688880AAug 25, 1987
Hologram lens
HITACHI LTD11 citations74
US4646279AFeb 24, 1987
Optical disk cutting apparatus using multiple beams
HITACHI LTD8 citations74
US4504937AMar 12, 1985
Optical information tracking apparatus
HITACHI LTD11 citations74
US4407880AOct 4, 1983
Substrate of member for recording information with light and method of manufacturing the same
HITACHI LTD13 citations74
US4348461ASep 7, 1982
Recording member
HITACHI LTD7 citations74
US4296419AOct 20, 1981
Member for recording information
HITACHI LTD7 citations74
US4235507ANov 25, 1980
Optical system to condense light from a semiconductor laser into a circular spot
HITACHI LTD10 citations74
US4710909ADec 1, 1987
Phase compensation apparatus for an optical information recording and reproducing system
HITACHI LTD11 citations73
US4223187ASep 16, 1980
Method and apparatus for recording and reproducing a video-disc with an oscillated track
HITACHI LTD17 citations73
US4541082ASep 10, 1985
Device for optically tracking information
HITACHI LTD8 citations72
US6205098B1Mar 20, 2001
Optical reproduction method and optical information apparatus
HITACHI LTD3 citations63
US5579292ANov 26, 1996
Magneto-optical data recording apparatus using a sample-servo system for applying heating pulses to record data
HITACHI LTD2 citations63
US4847822AJul 11, 1989
Optical information recording and reproducing apparatus with tracking control by sampling
HITACHI LTD4 citations63
US4241240ADec 23, 1980
Optical information recording apparatus
HITACHI LTD3 citations62
US6614737B2Sep 2, 2003
Optical reproduction method and optical information device
HITACHI LTD1 citations52
US6442120B2Aug 27, 2002
Optical reproduction method and optical information device
HITACHI LTD0 citations52