Inventor · disambiguated record
Naoyuki Kagami
Also filed as: KAGAMI NAOYUKI
48 granted patents·1 pending application·650 citations·filing 1991–2023
98Inventor score
Files withIBM26WESTERN DIGITAL TECH INC15HITACHI GLOBAL STORAGE TECH6HITACHI GLOBAL TECH NL BV1HITACHI GLOBAL TECHNOLOGIES1
Top patents by PatentIndex Score
49 records- 0194US6754019B2System and method for implementing a rotary memory deviceHITACHI GLOBAL STORAGE TECH·Filed 2001·Granted Jun 22, 2004·46 cites·19 claims
- 0294US6549349B2Adaptive vibration control for servo systems in data storage devicesIBM·Filed 2001·Granted Apr 15, 2003·44 cites·100 claims
- 0393US11763843B1VCM PWM to linear mode transition offset optimization to improve PESWESTERN DIGITAL TECH INC·Filed 2022·Granted Sep 19, 2023·3 cites·11 claims
- 0492US6219196B1Method and apparatus for suppressing mechanical resonance in a disk drive storage device using a notch filterIBM·Filed 1998·Granted Apr 17, 2001·73 cites·21 claims
- 0591US6614613B1Phase technique for active damping in a servo-controlled actuatorIBM·Filed 2000·Granted Sep 2, 2003·32 cites·26 claims
- 0689US11823710B2Dual spindle motors and dual spindle motor control for data storageWESTERN DIGITAL TECH INC·Filed 2022·Granted Nov 21, 2023·2 cites·16 claims
- 0789US11763844B1Data storage device having dual actuators and method for emergency power off retract (EPOR) of dual actuatorsWESTERN DIGITAL TECH INC·Filed 2022·Granted Sep 19, 2023·2 cites·25 claims
- 0889US7035034B2Data storage device, control device, off-track control method, and control methodIBM·Filed 2003·Granted Apr 25, 2006·26 cites·30 claims
- 0988US11749303B2Data storage device with soft on-disk activation of fine actuatorsWESTERN DIGITAL TECH INC·Filed 2021·Granted Sep 5, 2023·2 cites·20 claims
- 1088US6831809B2Rotary recording apparatus and method of controlling the apparatusIBM·Filed 2002·Granted Dec 14, 2004·26 cites·19 claims
- 1187US10635158B1Write data protection at emergency power offWESTERN DIGITAL TECH INC·Filed 2017·Granted Apr 28, 2020·5 cites·22 claims
- 1287US5199017AOptical disk drive and method for counting the number of tracks on an optical diskIBM·Filed 1991·Granted Mar 30, 1993·41 cites·10 claims
- 1386US10996740B2Write data protection at emergency power offWESTERN DIGITAL TECH INC·Filed 2020·Granted May 4, 2021·2 cites·19 claims
- 1484US6690537B2Method and system for controlling the positioning of a read/write head of a data recording deviceHITACHI GLOBAL STORAGE TECH·Filed 2001·Granted Feb 10, 2004·16 cites·10 claims
- 1584US6122139ADisk drive rotary actuator system including synchronous counter torque generatorIBM·Filed 1998·Granted Sep 19, 2000·39 cites·32 claims
- 1677US5402402AApparatus for controlling a optical disk driveIBM·Filed 1993·Granted Mar 28, 1995·27 cites·14 claims
- 1776US6707634B2Control method and apparatus for reducing the effects of hard disk contaminationHITACHI GLOBAL STORAGE TECH·Filed 2001·Granted Mar 16, 2004·11 cites·6 claims
- 1876US6411056B1System and method for stabilizing disk drive rotation controlIBM·Filed 2000·Granted Jun 25, 2002·12 cites·8 claims
- 1972US6961202B2Data storage device having acceleration sensor attached to circuit board for detecting vibrations in planar rotation direction along circuit boardHITACHI GLOBAL STORAGE TECH·Filed 2003·Granted Nov 1, 2005·9 cites·10 claims
- 2072US6567230B1Method and system for performing positioning control of a head actuator in a disk device utilizing a digital filterIBM·Filed 1999·Granted May 20, 2003·25 cites·20 claims
- 2170US6937422B2Self-monitoring and self-healing of frequency specific position errors in a data storage deviceHITACHI GLOBAL TECH NL BV·Filed 2002·Granted Aug 30, 2005·7 cites·58 claims
- 2268US12266385B2Data storage device having dual actuators and method for emergency power off retract (EPOR) of dual actuatorsWESTERN DIGITAL TECH INC·Filed 2023·Granted Apr 1, 2025·0 cites·20 claims
- 2368US12254909B2VCM PWM to linear mode transition offset optimization to improve PESWESTERN DIGITAL TECH INC·Filed 2023·Granted Mar 18, 2025·0 cites·20 claims
- 2467US6351343B1Arrangement structure of the printed circuit board and the interface cable connector of a magnetic disk driveIBM·Filed 1997·Granted Feb 26, 2002·19 cites·14 claims
- 2566US2024062785A1Dual spindle motors and dual spindle motor control for data storageWESTERN DIGITAL TECH INC·Filed 2023·Application pending·0 cites
- 2664US5339299AOptical disk drive apparatus for searching a target trackIBM·Filed 1992·Granted Aug 16, 1994·14 cites·13 claims
- 2762US6337777B1Method and apparatus for controlling data write operationsIBM·Filed 1999·Granted Jan 8, 2002·15 cites·12 claims
- 2862US5459309AFocus acquiring method and optical disk driveIBM·Filed 1993·Granted Oct 17, 1995·14 cites·4 claims
- 2962US5384762AFocusing servo in an optical disk driveIBM·Filed 1994·Granted Jan 24, 1995·13 cites·6 claims
- 3060US6377418B1Digital filter, servo control unit, and disk driveIBM·Filed 1998·Granted Apr 23, 2002·16 cites·17 claims
- 3160US5249168AMethod and apparatus for initializing optical disk drive apparatusIBM·Filed 1991·Granted Sep 28, 1993·12 cites·4 claims
- 3258US6414809B1Data storage device servo control apparatus and methodIBM·Filed 1999·Granted Jul 2, 2002·13 cites·16 claims
- 3357US11373678B2Data storage device using windowed delta-sigma analog-to-digital converter in digital current control loopWESTERN DIGITAL TECH INC·Filed 2021·Granted Jun 28, 2022·0 cites·20 claims
- 3457US5255253AApparatus and method for controlling the velocity of a disk storage headIBM·Filed 1991·Granted Oct 19, 1993·11 cites·4 claims
- 3556US11978482B2Data storage device with closed loop extended park mode during spin down operationWESTERN DIGITAL TECH INC·Filed 2022·Granted May 7, 2024·0 cites·17 claims
- 3656US6678109B2Disk drive, servo control unit, and control unitHITACHI GLOBAL TECHNOLOGIES·Filed 1998·Granted Jan 13, 2004·13 cites·9 claims
- 3756US5412637AMethod for putting an optical head in a stationary state and optical disk drive apparatusIBM·Filed 1994·Granted May 2, 1995·13 cites·10 claims
- 3854US11862202B2Data storage device with smart ISOFET threshold voltage automatic tuningWESTERN DIGITAL TECH INC·Filed 2022·Granted Jan 2, 2024·0 cites·21 claims
- 3952USRE36864EOptical disk drive and methods for counting the number of tracks on an optical diskIBM·Filed 1995·Granted Sep 12, 2000·10 cites·10 claims
- 4051US11837264B2Data storage device having dual actuators and method for data egress throttling during emergency power off retract (EPOR)WESTERN DIGITAL TECH INC·Filed 2022·Granted Dec 5, 2023·0 cites·20 claims
- 4150US11948603B1Optimize power, RTV, and coupled PES during seek operationsWESTERN DIGITAL TECH INC·Filed 2022·Granted Apr 2, 2024·0 cites·30 claims
- 4250US6218794B1Spindle motor startup method and apparatusIBM·Filed 1999·Granted Apr 17, 2001·15 cites·5 claims
- 4349US6937408B2Rotation recording apparatus and method of inspection thereofHITACHI GLOBAL STORAGE TECH·Filed 2002·Granted Aug 30, 2005·2 cites·2 claims
- 4445US6263462B1Testing method and testerIBM·Filed 1998·Granted Jul 17, 2001·8 cites·6 claims
- 4544US7019921B2Control method and apparatus for reducing the effects of hard disk contaminationHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Mar 28, 2006·0 cites·8 claims
- 4643US11043243B2Calibrating elevator actuator for disk driveWESTERN DIGITAL TECH INC·Filed 2020·Granted Jun 22, 2021·0 cites·20 claims
- 4741US6324132B1Method and system for controlling the positioning of a read/write head of a data recording deviceIBM·Filed 1999·Granted Nov 27, 2001·4 cites·20 claims
- 4839US6529344B1Method and system for compensating a head positioning servo in a storage deviceIBM·Filed 1999·Granted Mar 4, 2003·4 cites·14 claims
- 4939US5872677AMagnetic head position detecting method and magnetic disk apparatusIBM·Filed 1996·Granted Feb 16, 1999·4 cites·17 claims
Join the waitlist — get patent alerts
Get an alert when Naoyuki Kagami files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →