Inventor

YANAGAWA NAOHARU

JP69 patents

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

YANAGAWA NAOHARU

PIONEER ELECTRONIC CORP

Optical disk type identification system using a frequency detector

Device for controlling the power of a recording optical beam in an information storage apparatus

Optical information recording/reproducing device

Tracking error signal correcting system which adjusts gain such that rending tracking error signals and recording trucking error signals and recording tracking error signals are equal

Optical pickup for an optical disc player

Optical disc apparatus with selection of three-beam and push-pull systems

Apparatus for controlling semiconductor laser

Rotary optical system for guiding and converging divided light beams to a tape recording medium

Device for and method of calibrating optimum recording power for recordable optical disc recording apparatus

Rotational optical head for optical recording medium

Floating optical pickup and information recording and reproducing apparatus including the same

Optical information recording and reproducing apparatus

Optical pickup apparatus having means to eliminate crosstalk in a focus error signal

Optical pickup device

Optical pickup for recording or reproducing system

Optical pickup for recording or reproducing system

Optical head

Optical pickup

Optical pick-up device

Recording device for recording a blank disk from an optical disk

Optical pickup apparatus

Magneto-optical card recording apparatus employing an initialization magnet and a recording magnet

Photo-detecting device including offset correction

Position detector for maintaining a fixed distance between two objects

Photo-detecting device

Optical head having a prism for splitting a beam of light into two polarized light beams

Apparatus for detecting focus error signal

Optical pickup for performing recording or reading operation on recording medium having prepits

Optical pickup control system for optical discs having different reflectivities

Reducing the recording power based on the timing of recorded synchronization signal

Optical pickup control system for an optical disc having recorded and non-recorded areas

Tracking error detecting system for removing an offset in an optical disk player

PIONEER CORP

Device and method for controlling tilt servo

Device and method for controlling tilt servo

Pre-pit detecting apparatus for optical recording medium

Information recording apparatus

Optical recording device and aberration correction method

Apparatus and method for re-executing pre-pit detection if pre-pits are not detected after changing reference level

Device and method for controlling tilt servo

Optical pickup device minimizing an undesirable astigmatism

Optical pickup device minimizing an undesirable astigmatism

Disc player having a prepit detecting circuit

Information recording device and method, and computer program

Information record apparatus and method, and computer program product

Laser light intensity controller

Recording apparatus and recording medium, and computer program

Recording apparatus and recording method, and computer program

Error counting apparatus for counting an error number of a pre-pit signal in an optical disc and method therefor

PIONEER ELECTRIC CORP

Pickup for an optical system including a blazed hologram for dividing a laser

Optical magnetic recording and reproducing system