Inventor

SUGIYAMA HISATAKA

JP97 patents

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

SUGIYAMA HISATAKA

HITACHI LTD

Optical reproducing method

Information recording medium and method and apparatus for recording and reproducing information using the same

Method and apparatus for information recording and reproduction of a pit-shape-forming optical recording type

Three-dimensional recording and reproducing apparatus

Short wavelength optical disk head having a changeable aperture

Information recording medium with tracks having a groove structure having a fixed cycle of wobble

Method and apparatus for recording and reproducing information using pseudo identification signal

Optical disk having wobbled information shared between tracks

Three-dimensional recording and reproducing apparatus

Information recording medium and method and apparatus for recording and reproducing information using the same

Information recording medium having wobbled groves

Information recording medium having wobbled groove structure and plural zones

Optical recording/reproducing apparatus

Optical recording medium using land/groove recording

Optical recording medium using land/groove recording

Method for recording and reading an optical disk

Three-dimensional recording and reproducing apparatus

Optical recording method

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

Split photo detector for detecting a central portion and a peripheral portion of a reflected light beam

Method of optical reproduction using pulsed light

Laser control for setting average recording power of &#34;1&#34; equal to average recording power of &#34;0&#34;

Correcting non-linear distortions of optical information with a non-linear equalizer

Optical recording method employing pit edge recording on recording medium divided into a plurality of zones wherein recording parameters vary from zone to zone

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

Optical information recording/reproducing apparatus using pit edge recording system

Non-linear optical saturable absorber layer in an optical disk to discriminate wavelength above or below a threshold level of intensity

Optical recording and reproducing system with high track density and low cross-talk

Optical recording and reproducing apparatus having a multi-spot positioning control mechanism

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

High-density information recording/reproducing method

High-density information recording/reproducing method

Reproduction of optical information by one-beam optics with reduced crosstalk as recorded in multi-phases and multi-levels at staggered lattice points, and apparatus and recording medium therefor

Optical disk device having optical phase compensator

Recording medium having a plurality of nonlinear transmission characteristics

Method and apparatus for detecting position of alternated land and groove of information recording medium

Optical disc apparatus and information recording apparatus using the optical disc apparatus

Information recording method

Information recording apparatus

Optical reproducing method for reproducing information on an optical medium having groove structure with fixed cycle of wobble

Optical reproducing method

Optical reproducing method

Method for reproducing information from optical medium

Information recording/reproducing apparatus

Optical recording/reproducing method and apparatus for controlling irradiation position of an optical spot

Information recording method

Information recording method

Information recording method

HITACHI MAXELL

Optical recording medium

TOSHIBA MACHINE CO LTD

Method and apparatus for molding optical glass elements or the like

Laser control for setting average recording power of "1" equal to average recording power of "0"