Inventor

YAMANAKA YUTAKA

JP50 patents

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

YAMANAKA YUTAKA

NEC CORP

Signal reproducing apparatus for optical recording and reproducing equipment with compensation of crosstalk from nearby tracks and method for the same

Semiconductor laser with vertical resonator

Optical head comprising a diffraction grating for directing two or more diffracted beams to optical detectors

Optical head apparatus for focussing a minute light beam spot on a recording medium

Optical disk, aberration correction method and optical disk apparatus

Holographic element

Optical head having multiple light sources having different wavelengths

Optical head device for reading two optical disks

Magneto-optical head system for detection of error and information signals by diffraction lights

Vertical-to-surface optical semiconductor device and apparatus for coupling optical signals

Method and apparatus for detecting the focusing state and positioning accuracy of a light beam directed onto an optical disk tracking guide in an optical recording system

Optical disc medium, and apparatus and method for recording data on the same

Optical head having optimum tilt angles

Condenser lens for optical disks

Optical head for reading information from a magnetooptic recording medium

Optical disk apparatus

Optical head for reproducing or recording a compact or similar disk

Optical information recording or playbacking system, optical head apparatus used in the system and method for recording or playbacking optical information

Apparatus for rotating a light image and an optical system for focusing light beams on a recording medium

Optical disc medium having extended record control data areas, optical disc apparatus using the same, and data recording method on the same

Optical disc and method for reproducing the same

Data recording/reproducing method for optical disk and apparatus for the same

Track servo control apparatus for optical disk

Optical head for recording and playing from optical disc

Optical head having a shading slit

Spot position-discriminating system and method for discriminating spot position

Photodetector with regions to detect reflected light pass through central portion and non-central portion of an objective lens

Optical disc medium having a system information recording area of low recording density

Optical disk medium and optical disk recording and reproducing apparatus

Radial tilt compensating optical disk apparatus using tracking control loop gain

Recording type optical disc medium and optical disc device for the same

Converging optical system for laser beam source

Focused spot position-discriminating system and optical disk with guiding groove suited therefor

Differential optical switch for data multiplexing in an optical fiber loop of an optical information storage apparatus

Optical information storage apparatus using optical fiber

Optical disk medium and optical disk apparatus

Optical disk medium and optical disk apparatus

Two-layer optical disk and recording/reproducing optical disk apparatus of the two-layer optical disk

Optical disk medium having a predetermined change in the tilt of the surface

TOSHIBA KK

Optical disk, optical disk recording method, and optical disk recording apparatus

Optical disk, optical disk drive and method of playing back an optical disk

Recording/reproducing method and recording/reproducing apparatus and optical disk

Optical disk medium and optical disk recording/reproducing apparatus utilizing tilt detection areas having special marks

FUJITSU LTD

Compiler for parallel computer

BRIDGESTONE CORP

Electromagnetic reflection body

TEAC CORP

Optical disk and optical disk drive for suppressing a digital sum value and low-frequency components

DENSO CORP

Step-up switching power supply circuit

YAMANAKA YUTAKA

Information readout device and information readout method

SANYO ELECTRIC CO

Optical disc recording method and apparatus

NAKATANI MORIO

Optical disc for tuple-speed recording and optical disc device for tuple-speed recording