Inventor

WATANABE TETSU

JP60 patents

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

WATANABE TETSU

SONY CORP

Optical disc system and optical disk therefor

Magneto-optical disk system with specified thickness for protective layer relative to the numerical aperture of the objective lens

Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens

Optical disk having a protective layer of specified thickness relative to the numerical aperture of the objective lens

Optical disc system having an objective lens with a numerical aperture related to the thickness of the protective layer

Magneto-optical disk system with specified thickness for protective layer relative to the numerical apperture of the objective lens

Magneto-optical disk recording and reading apparatus and method wherein the recording head is controlled in the radial direction of the disk to a desired position

Magneto-optical overwrite recording and reproducing system

Recording apparatus using magneto-optical effect including control means for inhibiting energizing of the light beam generating means in responsive to coded data

Recording medium with unembossed area indicating sector divisions

Apparatus for re-recording a digital signal on a record medium and for reproducing the same therefrom

Optical recording medium and disc cartridge

Disc recording/reproducing apparatus

Magneto-optical disc recording/reproducing apparatus

Apparatus for recording and/or reproducing digital signal

Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus

Optical near-field generating apparatus and method and information recording and reproducing apparatus

Optical element, metal mold for producing optical element and production method for optical element

Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens

Optical recording medium and disc cartridge

Optical device, optical system, method of production of same, and mold for production of same

Optical device, optical system, method of production of same, and mold for production of same

Optical device, optical system, method of production of same, and mold for production of same

Optical element and manufacturing method for same

Optical device, optical system, method of production of same, and mold for production of same

Read-only optical recording medium and disc cartridge

Optical recording medium and disc cartridge having 2 GB capacity

Optical recording/reproducing apparatus, optical rotating recording medium, and method of designing optical recording/reproducing apparatus

Optical disk having a protective layer specified thickness relative to the NA of an objective lens and the wavelength of light source

Disc drive apparatus

Magneto-optical head capable of operation under inclination of the disc

Magneto-optical disk system having an objective lens with a numerical aperture related to the thickness of the protective layer

Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk

Optical disk system having an objective lens with a numerical aperture related to the thickness of the protective layer

Disc recording method wherein a segment is recorded with reference data to control the phase of a data clock

Recording/reproducing apparatus that utilizes the servo clock signals to form read and write clock signals with different frequencies

Recording/reproducing apparatus that forms read and write clock signals with differing frequencies from the servo clock signals

Magneto-optical disc system having an objective lens with a numerical aperture related to the thickness of the protective layer

Optical disc system and optical disc therefor

Magneto-optical disk system with specified thickness for protective layer relative to the numerical aperture of the objective lens

Magneto-optical disc recording/reproducing apparatus

Magneto-optical signal reproducing apparatus in which reproduced magneto-optical signal level is compared with reference signal level varied in accordance with in-phase signal

Magneto-optical recording apparatus with pulse driven light beam and variable delay of magnetic field reversals based on recording medium characteristics

Magneto-optical disk recording apparatus

Optical disc reproducing apparatus which employs a binary detector for the outer tracks and a ternary detector for the inner tracks

Optical pickup device with shielding to limit incident or emitted light

Optical pickup

Optical pickup

Optical disk system having objective lens with a numerical aperture related to thickness of protective layer

HITACHI LTD

Apparatus and method for recording/reproducing magneto-optical information