Inventor
UTSUMI MASAMICHI
JP5 patents
Patents
5 patentsUS6222803B1Apr 24, 2001
Optical pickup for discriminating between and reading different types of optical discs
SONY CORP22 citations91
US5742575AApr 21, 1998
Method and device for identifying disc
SONY CORP23 citations91
US5682372AOct 28, 1997
Method and apparatus for playing back multilayer disk
SONY CORP29 citations87
US6366543B2Apr 2, 2002
Optical pickup for discriminating between and reading different types of optical discs
SONY CORP11 citations72
US5751679AMay 12, 1998
Hologram formed on an objective lens for one defracting light beams which are separated by more than one track width
SONY CORP6 citations61