Inventor

OJIMA MASAHIRO

JP39 patents

⚠️ This page may combine multiple inventors who share the name “OJIMA MASAHIRO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

OJIMA MASAHIRO

HITACHI LTD

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

Wavelength multiplexing optical recording apparatus

Semiconductor laser device

Optical information recording apparatus

Recording medium

Optical information processor with prismatic correction of laser beam shape

Resin molded optical assembly

Magneto-optical recording and reproducing method, magneto-optical memory apparatus and magneto-optical recording medium therefor

Overwritable magneto-optic recording and reproducing apparatus

Method and apparatus for thermo magnetic recording/erasing information with preselected magnetic field switching

Apparatus for detecting magneto-optical anisotropy

Stack type optical disc apparatus, sealed and separate type optical head therefor and optical disc medium

Magneto-optical memory apparatus having a floating magnetic head

Optical information phase change recording medium having double protective layer

Magneto-optic information storage system utilizing a self-coupled laser

Dispersion compensator and optical transmission system using same

Magneto-optical recording system utilizing a leakage magnetic field of focusing actuator

Optical pickup

Magnetic head load/unload device, method and a magneto-optical disk apparatus using the same

Magneto-optical recording media and mangeto-optical device using the media

Optical recording method

Magneto-optical recording apparatus having a magnetic slider with increased rail width

Semiconductor laser device having a transparent waveguide and a large second harmonic generation output

Magneto-optical recorder with compensation for variation in applied magnetic field intensity on a recording medium

Semiconductor laser array device

Information recording apparatus for recording/reproducing information by irradiating an information recording medium with an energy beam

Optical head with improved extinction ratio for magneto-optical memory

Recording member

Member for recording information

Method of and apparatus for driving semiconductor laser

Two-laser collimated beam optical head with monitor

Magneto-optical recording media and magneto-optical recording device using the same

Magneto-optical recording media and overwrite recording method using the same

Magneto-optical disc memory apparatus including a header signal and magneto-optical signal level adjusting circuit

Information recording medium and apparatus using reversible phase change

Method for erasing recording in a PHB memory

Optical switching device and optical switching method

HITACHI MAXELL

Optical information recording/reproducing system including novel tracking system

HITACHI CABLE

Magneto-optical head employing optical fiber connected stationary and movable portions