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Inventor

Masahiro Birukawa

Inventor
Hirakata, JP

Overview

56→
Patents
1985–2013
Patent span
Physics
Primary field (CPC G)

Patents· 56 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G11Bprimary
G11BInformation storage based on relative movement between record carrier and transducer63%
Y10TTechnical subjects covered by former us classification13%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests12%
B82YSpecific uses or applications of nanostructures8%
G02BOptical elements, systems or apparatus1%
G03GElectrography1%
H01FMagnets1%
PatentTitleYear
8,526,293'Information recording medium and recording/reproducing method for the same'20138,451,699'Optical information reproduction device, optical information recording device, optical information reproduction method, and optical information recording method'20138,422,341'Device and method for recording and/or reproducing data onto/from information recording medium by using near-field light and information recording medium'20138,385,161'Optical information reproducing device, optical information reproducing method and integrated circuit'20138,279,721'Near-field recording head capable of directly forming light source in slider'20128,259,541'Optical recording/reproduction method, optical recording/reproduction device, program, and optical recording medium'20128,233,372'Optical system for compensating for coma aberration and/or spherical aberration in an optical pickup device and optical pickup device having the same'20128,179,768'Optical system for compensating for spherical aberration and/or coma aberration in an optical pickup device and optical pickup device having the same'20128,130,623'Optical information recording and/or reproducing apparatus, optical information recording and/or reproducing method, optical information recording medium, and solid immersion lens'20128,130,625'Optical information recorder/reproducer, optical information recording/reproducing method and control circuit'20128,050,150'Near-field light detection element and information reproducing medium reproducing method'20118,040,774'Optical disk device and tilt correction method for optical disk device'20117,957,232'Gap controller and optical information processor'20117,948,835'Optical disc device, method for activating optical disc device, and control circuit'20117,944,799'Optical information apparatus with gap control system'20117,773,343'Magnetic recording medium, and manufacturing method, manufacturing apparatus, recording and reproduction method, and recording and reproduction apparatus for the same'20107,420,889'Optical disc tracking control device, tracking control method, and tracking control program'20087,235,313'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'20077,180,831'Magneto-optical recording medium having a recording layer of columnar structure'20077,180,842'Optical disc cutting apparatus and method for manufacturing optical disc'20077,126,886'Magneto-optical recording medium and method for producing the same'20066,982,932'Recording/reproducing head and recording/reproducing apparatus incorporating the same'20066,811,889'Magneto-optical recording medium having a GDFECO readout magnetic film'20046,765,847'Optical disk and method of magnetically separating tracks of the optical disk'20046,747,919'Magneto-optical recording medium, and method and apparatus for producing the same'20046,690,626'Optical disk with magnetic layer separated magnetically between tracks and method of magnetically separating tracks of the optical disk'20046,650,598'Magnetic head having magnetoresistance device and recording/reproducing apparatus incorporating the same'20036,521,357'Magneto-optical recording medium'20036,504,796'Magneto-optical head having thickness of the core same as a track width'20036,399,227'Magneto-optical recording medium'20026,307,819'Method of reading magneto-optical recording medium'20016,269,056'Recording method for a magneto-optical recording medium for position adjustment of a magnetic head'20016,222,797'Position adjustment method of a magnetic head using magneto-optical recording medium, and optical recording medium'20016,188,649'Method for reading magnetic super resolution type magneto-optical recording medium'20016,178,151'Optical head having a reproducing optical system and filter formed by light passing therethrough'20016,146,740'Magnetic recording medium and method of fabricating the same'20006,018,505'Magneto-optical disc apparatus'20006,018,511'Magneto-optical recording medium and readout method of the same'20005,993,937'Magneto-optic recording medium and method of fabricating the same'19995,986,977'Method for reading magnetic super resolution type magneto-optical recording medium'19995,864,520'Magneto-optical recording medium for magnetically induced super resolution'19995,821,004'Magneto-optical recording medium and recording and reading out process using the same'19985,814,418'Magneto-optical recording medium and method for reading out information from the same'19985,748,592'Disk drive apparatus and disk storage medium for high density recording'19985,724,338'Rewritable disk-shaped optical recording medium'19985,706,259'Magneto-optical recording medium for magnetically induced super resolution'19985,679,386'Optical disk formation member for making an optical disk substrate'19975,656,370'Optical recording medium'19975,582,891'Optical disk substrate with land planes of uniform height'19965,565,278'Magneto-optical recording medium'19965,472,758'Optical recording medium for short-wavelength of laser beam and read/write/erase method using the medium'19955,422,874'Optical recording disk, and recording/reading apparatus using same'19955,391,431'Magneto-optical recording medium'19955,341,359'Abnormality detection of a recording medium in a magneto-optical recording system'19945,247,495'Optical magnetic disk with separate regions provided on it'19934,497,870'Magneto-optical recording medium'1985

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1985–2008Patents assigned to MATSUSHITA ELECTRIC INDUSTRIAL CO LTD (39)· patent assignee history
1985–2008Based in Hirakata, JP· patent location history
1998–2013Based in Osaka, JP· patent location history
2004–2006Patents assigned to CANON KK (4)· patent assignee history
2010–2013Patents assigned to PANASONIC CORP (16)· patent assignee history
2012–2013Patents assigned to BIRUKAWA MASAHIRO (10)· patent assignee history
2012–2013Patents assigned to NARUMI KENJI (6)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
MATSUSHITA ELECTRIC INDUSTRIAL CO LTD391985–2008
PANASONIC CORP162010–2013
BIRUKAWA MASAHIROself102012–2013
NARUMI KENJI62012–2013
CANON KK42004–2006
Locations
LocationPatentsSpan
Hirakata, JP311985–2008
Osaka, JP251998–2013