Inventor
HIRAO MOTOHISA
JP9 patents
Patents
9 patentsUS5340637AAug 23, 1994
Optical device diffraction gratings and a photomask for use in the same
HITACHI LTD67 citations94
US4775980AOct 4, 1988
Distributed-feedback semiconductor laser device
HITACHI LTD28 citations92
US4665528AMay 12, 1987
Distributed-feedback semiconductor laser device
HITACHI LTD25 citations92
US4426700AJan 17, 1984
Semiconductor laser device
HITACHI LTD30 citations91
US4366569ADec 28, 1982
Semiconductor laser device including an arrangement for preventing laser degradation caused by excessive current flow
HITACHI LTD26 citations81
US4905057AFeb 27, 1990
Semiconductor devices
HITACHI LTD10 citations73
US4288757ASep 8, 1981
Semiconductor laser device
HITACHI LTD17 citations73
US4361887ANov 30, 1982
Semiconductor light emitting element
HITACHI LTD18 citations72
US4841536AJun 20, 1989
Semiconductor laser devices
HITACHI LTD6 citations60