Inventor
OHSATO KIYOSHI
JP44 patents
Patents
44 patentsUS5764613AJun 9, 1998
optical pickup apparatus
SONY CORP117 citations98
US6721259B1Apr 13, 2004
Optical head and recording/reproducing device
SONY CORP61 citations96
US6353592B1Mar 5, 2002
Optical recording medium and optical disk device
SONY CORP52 citations96
US6097688AAug 1, 2000
Recording/reproducing apparatus and recording/reproducing method for optical recording media
SONY CORP55 citations96
US5841513ANov 24, 1998
Apparatus for reproducing sound signals recorded on a motion picture film with digital sound track
SONY CORP68 citations96
US5513158AApr 30, 1996
Optical disk pickup device with focusing correction by electrostriction
SONY CORP51 citations96
US4775968AOct 4, 1988
Tracking error detecting system for optical head
SONY CORP59 citations96
US6414931B1Jul 2, 2002
Lens driving device, optical head and optical disc system
SONY CORP26 citations93
US6292453B1Sep 18, 2001
Optical disc recording/reproduction apparatus having a lens group, focus, servo, and jog mode adjustment
SONY CORP37 citations93
US6115347ASep 5, 2000
Optical pick-up device, optical recording/reproducing apparatus and objective lens
SONY CORP28 citations93
US6058095AMay 2, 2000
Objective lens having a doublet lens with high numerical aperture
SONY CORP21 citations93
US6041031AMar 21, 2000
Optical disc recording/reproduction apparatus and method
SONY CORP24 citations93
US6005834ADec 21, 1999
Optical recording medium recording and reproducing apparatus and optical pickup device
SONY CORP30 citations93
US5712842AJan 27, 1998
Optical pick-up device
SONY CORP55 citations93
US5515348AMay 7, 1996
Optical disk pickup device with tilt compensation by electrostriction
SONY CORP26 citations93
US5191571AMar 2, 1993
Tracking control method and apparatus for an optical disc system
SONY CORP27 citations93
US5159589AOct 27, 1992
Optical recording and/or reproducing apparatus
SONY CORP38 citations93
US5140577AAug 18, 1992
Tracking error signal generating circuit for a multichannel type optical disc player
SONY CORP27 citations93
US4796250AJan 3, 1989
Optical recording and reproducing apparatus including a disc extraction area for power setting a laser
SONY CORP35 citations93
US4631397ADec 23, 1986
Focussing error detecting apparatus employing a composite lens
SONY CORP39 citations93
US4612437ASep 16, 1986
Focussing error detecting apparatus for use in an optical disc reproducing device, an auto-focus camera or image-pickup device
SONY CORP52 citations93
US5442615AAug 15, 1995
Optical plate for correcting comatic aberration
SONY CORP48 citations92
US5303250AApr 12, 1994
Laser light generating apparatus
SONY CORP34 citations92
US5239528AAug 24, 1993
Optical head control circuit for optical tape recording/reproducing apparatus
SONY CORP24 citations92
US4733385AMar 22, 1988
Signal recording and reproducing apparatus for an opto-magnetic disk
SONY CORP30 citations92
US6222803B1Apr 24, 2001
Optical pickup for discriminating between and reading different types of optical discs
SONY CORP22 citations91
US6674696B1Jan 6, 2004
Focus controlling apparatus and method, and optical disc drive
SONY CORP12 citations74
US6104691AAug 15, 2000
Objective lens unit and recording/reproduction apparatus
SONY CORP13 citations74
US6055113AApr 25, 2000
Optical pickup and an optical pickup objective lense assembling method
SONY CORP12 citations74
US5828453AOct 27, 1998
Lens designing method and objective lens apparatus with two lenses
SONY CORP11 citations74
US5786947AJul 28, 1998
Optical pickup device with a floating element
SONY CORP7 citations74
US5774281AJun 30, 1998
Optical pickup device for light collection onto an optical recording medium
SONY CORP10 citations74
US5559766ASep 24, 1996
Rotary drum tape recording apparatus with controlling optical recording tracks using stored results of scanning of reference tracks
SONY CORP16 citations74
US5168487ADec 1, 1992
Optical recording and/or reproducing apparatus
SONY CORP11 citations74
US5090004AFeb 18, 1992
Tracking system for optical recording and/or reproducing apparatus employing a main light beam and a plurality of auxiliary light beams
SONY CORP11 citations74
US5063555ANov 5, 1991
Rotary optical head
SONY CORP17 citations74
US4766585AAug 23, 1988
Tracking error detecting apparatus for optical head
SONY CORP7 citations74
US6366543B2Apr 2, 2002
Optical pickup for discriminating between and reading different types of optical discs
SONY CORP11 citations72
US4742506AMay 3, 1988
Tracking error detecting apparatus for an optical head with skew error reduction by using an inclined header portion
SONY CORP13 citations72
US5260927ANov 9, 1993
Optical pickup device for recordable disc and dichroic mirror
SONY CORP10 citations71
US5572380ANov 5, 1996
Disc playback apparatus with automatic disc changer
SONY CORP5 citations63
US5023855AJun 11, 1991
Optical disc access control system that counts tracks using tracking control signal
SONY CORP6 citations63
US4593386AJun 3, 1986
Optical disc player with improved tracking control
SONY CORP6 citations62
USRE40371EJun 10, 2008
Optical disc recording/reproduction apparatus and method
SONY CORP0 citations52