Katsuhiko Ohtomo

Optical disk having wobbled, discontinuous grooves

Optical recording medium having a specified range of pit widths and pit depths

Base for optical recording medium and stamper for manufacturing base of optical recording medium

Optical recording medium capable of assuring sufficient levels of signals required for reading/writing data, and stamper for manufacture of the same

Recording and reproducing apparatus and recording and reproducing method providing real time editing while data is being input

Recording medium and its manufacturing method, and recording medium master and its manufacturing method

Optical disc having buffering areas capable of storing a pattern for obtaining tracking error signals and recording and/or reproducing apparatus therefor

Optical recording medium with grooves, optical recording medium master with grooves, apparatus for manufacturing optical recording medium master with grooves, and optical recording/reproducing apparatus

High density recording medium with pit width to track pitch ratio in the range of 0.4 to 0.55 for push-pull tracking servo control

Record medium, its manufacturing method, mother disc for record medium, and its manufacturing method