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Inventor

Naoyuki Kagami

Inventor
Fujisawa, JP

Overview

37→
Patents
1993–2021
Patent span
Physics
Primary field (CPC G)

Patents· 37 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G11Bprimary
G11BInformation storage based on relative movement between record carrier and transducer73%
G06FElectric digital data processing8%
H02PControl or regulation of electric motors, electric generators or dynamo-electric converters6%
H03HImpedance networks, e.g. resonant circuits4%
Y02DClimate change mitigation technologies in information and communication technologies [ict], i.e. information and communication technologies aiming at the reduction of their own energy use4%
G05DSystems for controlling or regulating non-electric variables2%
H01FMagnets2%
PatentTitleYear
11,043,243Calibrating elevator actuator for disk drive202110,996,740Write data protection at emergency power off202110,635,158Write data protection at emergency power off20207,035,034'Data storage device, control device, off-track control method, and control method'20067,019,921'Control method and apparatus for reducing the effects of hard disk contamination'20066,961,202'Data storage device having acceleration sensor attached to circuit board for detecting vibrations in planar rotation direction along circuit board'20056,937,422'Self-monitoring and self-healing of frequency specific position errors in a data storage device'20056,937,408'Rotation recording apparatus and method of inspection thereof'20056,831,809'Rotary recording apparatus and method of controlling the apparatus'20046,754,019'System and method for implementing a rotary memory device'20046,707,634'Control method and apparatus for reducing the effects of hard disk contamination'20046,690,537'Method and system for controlling the positioning of a read/write head of a data recording device'20046,678,109'Disk drive, servo control unit, and control unit'20046,614,613'Phase technique for active damping in a servo-controlled actuator'20036,567,230'Method and system for performing positioning control of a head actuator in a disk device utilizing a digital filter'20036,549,349'Adaptive vibration control for servo systems in data storage devices'20036,529,344'Method and system for compensating a head positioning servo in a storage device'20036,414,809'Data storage device servo control apparatus and method'20026,411,056'System and method for stabilizing disk drive rotation control'20026,377,418'Digital filter, servo control unit, and disk drive'20026,351,343'Arrangement structure of the printed circuit board and the interface cable connector of a magnetic disk drive'20026,337,777'Method and apparatus for controlling data write operations'20026,324,132'Method and system for controlling the positioning of a read/write head of a data recording device'20016,263,462'Testing method and tester'20016,218,794'Spindle motor startup method and apparatus'20016,219,196'Method and apparatus for suppressing mechanical resonance in a disk drive storage device using a notch filter'20016,122,139'Disk drive rotary actuator system including synchronous counter torque generator'2000RE036864'Optical disk drive and methods for counting the number of tracks on an optical disk'20005,872,677'Magnetic head position detecting method and magnetic disk apparatus'19995,459,309'Focus acquiring method and optical disk drive'19955,412,637'Method for putting an optical head in a stationary state and optical disk drive apparatus'19955,402,402'Apparatus for controlling a optical disk drive'19955,384,762'Focusing servo in an optical disk drive'19955,339,299'Optical disk drive apparatus for searching a target track'19945,255,253'Apparatus and method for controlling the velocity of a disk storage head'19935,249,168'Method and apparatus for initializing optical disk drive apparatus'19935,199,017'Optical disk drive and method for counting the number of tracks on an optical disk'1993

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1993–2006Patents assigned to IBM (26)· patent assignee history
1993–2021Based in Fujisawa, JP· patent location history
1999Based in Fjuisawa, JP· patent location history
2004–2006Patents assigned to HITACHI GLOBAL STORAGE TECH (6)· patent assignee history
2004Patents assigned to HITACHI GLOBAL TECHNOLOGIES (1)· patent assignee history
2005Patents assigned to HITACHI GLOBAL TECH NL BV (1)· patent assignee history
2005Based in Kanagawa, JP· patent location history
2020–2021Patents assigned to WESTERN DIGITAL TECH INC (3)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
IBM261993–2006
HITACHI GLOBAL STORAGE TECH62004–2006
WESTERN DIGITAL TECH INC32020–2021
HITACHI GLOBAL TECH NL BV12005
HITACHI GLOBAL TECHNOLOGIES12004
Locations
LocationPatentsSpan
Fujisawa, JP341993–2021
Kanagawa, JP22005
Fjuisawa, JP11999