Inventor

SHIGEMATSU KAZUO

JP69 patents

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

SHIGEMATSU KAZUO

HITACHI LTD

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

Wobble signal detecting circuit, wobble abnormality detecting circuit, information processing apparatus using these circuits and method and recording medium used in the apparatus or method

Recording method using trial write test pattern

Magnetooptic disc apparatus and recording medium

Recording and reproducing device for recording and reproducing information from different kinds of storage media having different sector formats

Method for recording and reading an optical disk

Method of controlling recording of optical records

Optical disc access method and optical disk storage using coarse and fine actuators

Optical recording method

Recording medium

Optical disk apparatus and recording and reading method for an optical disk using the same

Method for controlling the farm of a magnetic domain of a magneto-optical disk using pre-write testing

Increased intensity optical recording medium with adjacent grooves of different optical depth and a method and apparatus for reproducing the same

Light modulation method for forming a mark in magneto-optical recording system

Optical recording/reproducing apparatus with light beam deflection means including wedge-shaped prism

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

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

Method and apparatus for compensating variation of read data in an optical data storage

Semiconductor laser driver circuit

Apparatus for storing and retrieving information using an electron beam

Optical information processing apparatus

Method and apparatus for controlling renewal of data in optical disc memory

Method and apparatus for tracking servo system

Information recording member

Information recording and reproducing method and system for disc-shaped recording mediums

Automatic gain control method and apparatus in optical disk system

Communications terminal

Magneto-optical data recording/reproducing method

Objective lens optical system, optical head and optical information reproduction apparatus

Optical information recording and reproducing apparatus

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

Optical disk and optical information processor

Information transmission system and information transmission apparatus

Information recording and reproducing method and system for disc-shaped recording mediums

Laser module, optical head and optical information recording and reproducing apparatus

Laser module and optical head

Method and apparatus for reading and writing information onto and from information recording disks

Method for recording information, apparatus for recording information, and information recording medium

Method and apparatus for optical recording and reproduction with tracking servo reducing track offset

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

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

Information recording member

Method and apparatus for optical detection of information

Substrate of member for recording information with light and method of manufacturing the same

Recording member

Member for recording information

Optical head and information recording and reproducing apparatus using it

HITACHI MAXELL

Unit and disc having a relatively rough surface and method of producing

PENTAX CORP

Optical lens for optical disc drive with aberration suppression for recording/reproducing for a plurality of optical disc types

MAEDA TAKESHI

Tracking servo setting method and apparatus