Inventor

TSUNODA YOSHITO

JP52 patents

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

TSUNODA YOSHITO

HITACHI LTD

Apparatus and record carrier for optical disc memory with correction pattern and master disc cutting apparatus

Optical scanning apparatus and asymmetrical aspheric scanning lens

Optical tape apparatus with a tracking control mechanism and/or a focusing control mechanism

Optical information processor for compensating offset

Information reproducing apparatus with plural beam readout

Multilayer optical information medium

Method of recording and reproduction of information using a recording medium available for information overlap recording, a recording medium and a recording and reproducing apparatus using the method

Apparatus for optical disc memory with correction pattern and master disc cutting apparatus

Information recording/reproducing method and apparatus

Magneto-optic memory apparatus with defect detection of recording medium during erasing operation

Optical information processing apparatus

Wavelength scanning interferometry and interferometer employing laser diode

Autofocusing control system

Optical information recording apparatus

Optical recording apparatus

Image forming method and apparatus using energy beam impingement on image forming particles to move the same

High capacity data storage method and system using independently controlled heads and circuitry for monitoring access frequency of data records

Variable length data in a parallel disk array

Small-sized optical memory device and information processing apparatus utilizing cylindrically shaped information recording medium

Optical information processor

Driving apparatus for semiconductor laser

Focal position detecting optical apparatus

Optical information recording apparatus including error checking circuit

Optical head for a videodisc player/recorder

Information play-back apparatus with astigmatic auto-focusing

Optical information recording apparatus

Automatic focusing apparatus

Focus error detection apparatus utilizing focusing an front and rear sides of focal planes

Holographic device with divided object beams, a multicolor light source and direction-selective screen

Hologram apparatus

Optical information recording and reproducing apparatus

Optical track position detecting apparatus and optical information processor using the same

Optical card having optical grooves for access and wobbled marks for tracking and a recording-reproducing apparatus therefor

Optical disk having track offset detection areas

Optical memory apparatus using an optical disc having guide-grooves of V-shape and predetermined optical depth and access method therefor

Optical information processing apparatus

Optical information processor and method for accessing rotating record carrier utilizing acousto-optic light deflector including holding a focus error signal during track jumping

Phased-array semiconductor laser apparatus

System for optically recording information

Information recording and reproducing apparatus

Optical head for a videodisc recorder/player

Apparatus for optically reconstructing information

Method for recording and reproducing information using at least two energy beams

Mastering machine for making an on-land recording master disk with two beam alignment servo loops

Information recording apparatus having automatic focusing

Method of detecting light spot control signal

Holograms impregnated with laser active material

MAEDA TAKESHI

Tracking servo setting method and apparatus

HITACHI MAXELL

Information recording disc

FIRST SCREENING CO LTD

Urinalysis device and health facilitation system