Inventor

BIRUKAWA MASAHIRO

JP56 patents

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

BIRUKAWA MASAHIRO

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD

Method for reading magnetic super resolution type magneto-optical recording medium

Rewritable disk-shaped optical recording medium

Optical recording disk, and recording/reading apparatus using same

Recording/reproducing head and recording/reproducing apparatus incorporating the same

Magnetic recording medium and method of fabricating the same

Magneto-optical recording medium and recording and reading out process using the same

Optical recording medium

Optical disk substrate with land planes of uniform height

Abnormality detection of a recording medium in a magneto-optical recording system

Magneto-optical recording medium and readout method of the same

Magneto-optical head having thickness of the core same as a track width

Optical head having a reproducing optical system and filter formed by light passing therethrough

Magneto-optical disc apparatus

Method for reading magnetic super resolution type magneto-optical recording medium

Optical magnetic disk with separate regions provided on it

Optical disk with magnetic layer separated magnetically between tracks and method of magnetically separating tracks of the optical disk

Magneto-optic recording medium and method of fabricating the same

Optical disk formation member for making an optical disk substrate

Magneto-optical recording medium for magnetically induced super resolution

Magneto-optical recording medium having a recording layer of columnar structure

Magnetic head having magnetoresistance device and recording/reproducing apparatus incorporating the same

Method of reading magneto-optical recording medium

Recording method for a magneto-optical recording medium for position adjustment of a magnetic head

Magneto-optical recording medium and method for reading out information from the same

Disk drive apparatus and disk storage medium for high density recording

Optical recording medium for short-wavelength of laser beam and read/write/erase method using the medium

Optical disc cutting apparatus and method for manufacturing optical disc

Optical disk and method of magnetically separating tracks of the optical disk

Magneto-optical recording medium

Magneto-optical recording medium

Magneto-optical recording medium

Magneto-optical recording medium

Magneto-optical recording medium, and method and apparatus for producing the same

Magneto-optical recording medium for magnetically induced super resolution

Optical disc tracking control device, tracking control method, and tracking control program

Magneto-optical recording medium, method of manufacturing magneto-optical recording medium, method of recording on magneto-optical recording medium, and method of reproduction from magneto-optical recording medium

Position adjustment method of a magnetic head using magneto-optical recording medium, and optical recording medium

Magneto-optical recording medium having a GDFECO readout magnetic film

Magneto-optical recording medium

PANASONIC CORP

Near-field light detection element and information reproducing medium reproducing method

Optical information apparatus with gap control system

Magnetic recording medium, and manufacturing method, manufacturing apparatus, recording and reproduction method, and recording and reproduction apparatus for the same

Optical disc device, method for activating optical disc device, and control circuit

Optical information reproducing device, optical information reproducing method and integrated circuit

TANAKA YASUHIRO

Optical system for compensating for spherical aberration and/or coma aberration in an optical pickup device and optical pickup device having the same

Optical system for compensating for coma aberration and/or spherical aberration in an optical pickup device and optical pickup device having the same

NARUMI KENJI

Device and method for recording and/or reproducing data onto/from information recording medium by using near-field light and information recording medium

Optical information recording and/or reproducing apparatus, optical information recording and/or reproducing method, optical information recording medium, and solid immersion lens

AIKOH HIDEKI

Near-field recording head capable of directly forming light source in slider

CANON KK

Magneto-optical recording medium and method for producing the same