Inventor
OHTOMO KATSUHIKO
JP11 patents
⚠️ This page may combine multiple inventors who share the name “OHTOMO KATSUHIKO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SONY CORP
10 patentsUS5822294AOct 13, 1998
Optical recording medium having a specified range of pit widths and pit depths
SONY CORP21 citations92
US5763037AJun 9, 1998
Base for optical recording medium and stamper for manufacturing base of optical recording medium
SONY CORP37 citations92
US6487164B1Nov 26, 2002
Optical recording medium capable of assuring sufficient levels of signals required for reading/writing data, and stamper for manufacture of the same
SONY CORP27 citations91
US5663946ASep 2, 1997
Optical disc having buffering areas capable of storing a pattern for obtaining tracking error signals and recording and/or reproducing apparatus therefor
SONY CORP20 citations91
US5539724AJul 23, 1996
Optical disk having wobbled, discontinuous grooves
SONY CORP41 citations91
US5838654ANov 17, 1998
Optical recording medium having a specified range of pit widths and pit depths
SONY CORP7 citations73
US5661706AAug 26, 1997
Recording and reproducing apparatus and recording and reproducing method providing real time editing while data is being input
SONY CORP11 citations72
US6975578B2Dec 13, 2005
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
SONY CORP8 citations71
US6349085B1Feb 19, 2002
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
SONY CORP6 citations62
US5715223AFeb 3, 1998
Method of measuring a deviation between a centerline between grooves and a control prepit pattern on a disc
SONY CORP2 citations61