Inventor
WACHI SHIGEAKI
JP41 patents
Patents
41 patentsUS4183079AJan 8, 1980
DC-AC inverter
SONY CORP164 citations99
US4089049AMay 9, 1978
Inverter circuit including transformer with shielding of undesired radiations
SONY CORP80 citations96
US5708649AJan 13, 1998
Optical disk capable of storing information data at difference clock rates
SONY CORP51 citations95
US5170385ADec 8, 1992
Recording medium with unembossed area indicating sector divisions
SONY CORP34 citations93
US6038207AMar 14, 2000
Optical disk capable of inhibiting from rental use
SONY CORP44 citations92
US5537374AJul 16, 1996
Optical recording medium and recording and/or reproducing apparatus using such optical recording medium
SONY CORP23 citations92
US5379282AJan 3, 1995
System for calculating focus servo control signal using focus error signal and reproduced RF signal
SONY CORP43 citations92
US4972398ANov 20, 1990
Optical disk drive with servo loop for detecting defective disks
SONY CORP38 citations92
US4466089AAug 14, 1984
Information signal reproducing apparatus
SONY CORP31 citations92
US5640383AJun 17, 1997
Apparatus and method for reproducing data from a record medium
SONY CORP18 citations91
US5079757AJan 7, 1992
Servo circuit for an optical disk information recording and reproducing apparatus with improved stability for tracking and focusing control
SONY CORP28 citations91
US7828620B2Nov 9, 2010
Method of manufacturing tubular carbon molecule and tubular carbon molecule, method of manufacturing field electron emission device and field electron emission device, and method of manufacturing display unit and display unit
SONY CORP9 citations83
US4820940AApr 11, 1989
Control circuits operating with pulse-width modulated signals
SONY CORP21 citations80
US5970026AOct 19, 1999
Temperature invariant, magneto-optic modulator coil driving circuit
SONY CORP7 citations74
US5504727AApr 2, 1996
Optical recording medium and recording and/or reproducing apparatus using such optical recording medium
SONY CORP9 citations74
US5487056AJan 23, 1996
Optical recording medium and recording and/or reproducing apparatus using such optical recording medium
SONY CORP8 citations74
US5471447ANov 28, 1995
Seek control for information storage disc drive
SONY CORP11 citations74
US5224086AJun 29, 1993
Spindle servo system for magneto-optical recording/playback apparatus
SONY CORP14 citations74
US5148424ASep 15, 1992
Detrack detecting system in an optical recording/reproducing apparatus
SONY CORP10 citations74
US5121016AJun 9, 1992
Linear motor
SONY CORP14 citations74
US5056072AOct 8, 1991
Seek apparatus for optical disc drive
SONY CORP9 citations74
US5003523AMar 26, 1991
Apparatus for recording and reproducing information on an optical disk with a focus servo system for avoiding influence of traverse signal during search
SONY CORP8 citations74
US4647828AMar 3, 1987
Servo system
SONY CORP12 citations74
US4543650ASep 24, 1985
Servo system including velocity and phase servo circuits for digital audio record disc reproducing apparatus
SONY CORP16 citations74
US4539666ASep 3, 1985
Apparatus for controlling rotation of a record disk at a constant linear velocity
SONY CORP12 citations74
US4091434AMay 23, 1978
Surge current protection circuit
SONY CORP17 citations74
US4047089ASep 6, 1977
Starting circuit for inverter
SONY CORP13 citations74
US5224085AJun 29, 1993
Optical recording and reproducing apparatus that cancels recording or erase mode if focus or tracking is improper
SONY CORP12 citations73
US5712836AJan 27, 1998
Apparatus and method for adjusting a rotational velocity of a disk storage medium with measuring the amount of time to reproduce address data stored thereon
SONY CORP7 citations72
US5471444ANov 28, 1995
Seek circuit for optical disc
SONY CORP6 citations63
US5168484ADec 1, 1992
Magnetic head lifting device for magneto-optical recording/reproducing apparatus including drive means responsive to a PLL circuit
SONY CORP5 citations63
US5138595AAug 11, 1992
Servo control circuit for optical disc apparatus
SONY CORP6 citations63
US5015932AMay 14, 1991
Actuator driving circuits
SONY CORP4 citations63
US4896310AJan 23, 1990
Light beam control arrangements for optical disc apparatus
SONY CORP4 citations63
US4551661ANov 5, 1985
Driving apparatus for a recording medium
SONY CORP2 citations63
US4039921AAug 2, 1977
Inverter radiation suppression
SONY CORP6 citations63
US4031454AJun 21, 1977
Transistor inverter
SONY CORP3 citations63
US4951272AAug 21, 1990
System and method for accessing tracks for optical disc apparatus
SONY CORP2 citations62
US4652799AMar 24, 1987
Apparatus for driving a recording medium at a constant speed relative to a pickup device
SONY CORP1 citations52
US4135237AJan 16, 1979
Inverter
SONY CORP1 citations52
US7892063B2Feb 22, 2011
Method of manufacturing tubular carbon molecule and tubular carbon molecule, method of manufacturing recording apparatus and recording apparatus, method of manufacturing field electron emission device and field electron emission device, and method of manufacturing display unit and display unit
SONY CORP1 citations51