Inventor

CHIKUMA KIYOFUMI

JP65 patents

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

CHIKUMA KIYOFUMI

PIONEER ELECTRONIC CORP

High density optical disk and method of making

Three-dimensional optical recording medium and optical information recording apparatus using the same

Non-regrowth distributed feedback ridge semiconductor laser and method of manufacturing the same

Method for feeding metalorganic gas from solid raw materials in MOCVD and its device

Wavelength converting device having an epitaxial waveguide layer

Optical information reproducing apparatus

Optical information recording medium providing reflected light at two different wavelengths, recording apparatus utilizing the same

Distributed feedback semiconductor laser

Ridge type semiconductor laser of laterally-coupled distributed feedback and method of manufacturing the same

Optical pickup, optical information recording carrier and recording and reproducing apparatus thereof

Optical pickup, optical information recording carrier and recording and reproducing apparatus thereof

Optical waveguide recording medium and apparatus for playing the same

Optical waveguide recording medium playing apparatus

Optical information recording medium providing reflected light at two different wavelengths

Fiber-type light conversion device

Optical wavelength converter

Fiber type wavelength conversion element

Optical information reproducing apparatus with selective photodetector output

Wavelength conversion element

Fiber type wavelength converter

Fibre-type wavelength converison device

Optical wavelength converter and method of manufacturing the same

Fiber-type light conversion device

Fiber type wavelength converter

Fiber type light wave-length converting apparatus

Fibre-type light wavelength coversion device

Fibre-type light conversion device

Fibre-type light conversion device

Aspheric object lens for optical data read-out apparatus

Ridge type semiconductor laser of laterally-coupled distributed feedback and method of manufacturing the same

Distributed feedback semiconductor laser element and method for making the same

Optical waveguide recording medium playing apparatus

Wavelength converting device and method of fabricating wavelength converting device

PIONEER CORP

Device for feeding raw material for chemical vapor phase deposition and method therefor

Nitride semiconductor laser and method of fabricating the same

Nitride semiconductor laser and method of fabricating the same

Semiconductor laser device providing laser light of two wavelengths and method of fabricating the same

Surface acoustic wave device and method of manufacturing the same

Optical transmitter and receiver module which demultiplexes a superimposed optical signal

Method of manufacturing non-regrowth distributed feedback ridge semiconductor

Semiconductor light-emitting device and fabrication method thereof

Surface acoustic wave device and method of manufacturing the same

Distributed feedback type semiconductor laser device

Ridge-structure DFB semiconductor laser and method of manufacturing the same

Optical transmitter/receiver module and method of manufacturing the same

Ridge-structure DFB semiconductor laser and method of manufacturing the same

Integrated semiconductor light-emitting device and method for manufacturing same

Method of manufacturing a ridge-shaped three dimensional waveguide

DOWA MINING CO

Method of subliming material in CVD film preparation method

Potassium-containing thin film and process for producing the same