Inventor
YAMAKAWA AKIO
JP23 patents
⚠️ This page may combine multiple inventors who share the name “YAMAKAWA AKIO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SONY CORP
17 patentsUS6570828B2May 27, 2003
Optical pickup device having a movable-side member driven with a predetermined inclination
SONY CORP21 citations91
US6222803B1Apr 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
US5506830AApr 9, 1996
Disk player
SONY CORP27 citations89
US5682372AOct 28, 1997
Method and apparatus for playing back multilayer disk
SONY CORP29 citations87
US4780865AOct 25, 1988
Optical information reproducing apparatus with tilt correction including projection and detection of a same diffusely illuminated field
SONY CORP23 citations82
US5963535AOct 5, 1999
Disk reproducing apparatus
SONY CORP11 citations74
US4896309AJan 23, 1990
Optical disc player with phase shift dependent on disk rotation direction
SONY CORP11 citations73
US4412320AOct 25, 1983
Releasable cover locking device
SONY CORP13 citations73
US6366543B2Apr 2, 2002
Optical pickup for discriminating between and reading different types of optical discs
SONY CORP11 citations72
US5875164AFeb 23, 1999
Apparatus and method for recording and reproducing information from a plurality of recording medium having different thickness and recording densities
SONY CORP11 citations72
US5737294AApr 7, 1998
Objective lens with two numerical apertures for reading/writing two optical discs
SONY CORP13 citations72
US6104688AAug 15, 2000
Objective lens, reproducing apparatus and reproducing method
SONY CORP11 citations69
US4779256AOct 18, 1988
Apparatus for detecting deviations from a mutually perpendicular condition between a disc and a light beam
SONY CORP4 citations62
USRE38538EJun 22, 2004
Apparatus and method for recording and reproducing information from a plurality of recording medium having different thicknesses and recording densities
SONY CORP3 citations61
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
US7995445B2Aug 9, 2011
Optical pickup apparatus, reproduction apparatus, and reproduction method
SONY CORP0 citations42