US Patent No: 5,377,096

Number of patents in Portfolio can not be more than 2000

Digital actuator controller using low-pass filter

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ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

The digital actuator controller of the present invention reduces the effect of aliasing peculiar to the digital control by inserting a low-pass filter (LPF), which was considered inadequate in the past, between a digital-to-analog converter and a power amplifier to thereby reduce the gain in the high frequency region.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
INTERNATIONAL BUSINESS MACHINES CORPORATIONARMONK, NY68841

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ono, Hiroyuki Kurashiki, JP 90 382

Cited Art

Patent Info (Count) # Cites Year
 
CIT GROUP/BUSINESS CREDIT, INC. (1)
5,206,570 Actuator servo compensation method 9 1991
 
MAXTOR CORPORATION (1)
4,536,809 Adaptive misposition correcting method and apparatus for magnetic disk servo system 75 1982
 
NEC CORPORATION (1)
4,788,608 Head positioning system for positioning a magnetic head on an eccentric target track 25 1986
 
SAMSUNG ELECTRONICS CO., LTD. (1)
5,257,252 Adaptive control system for a disk drive actuator 11 1991

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
ELECTRO SCIENTIFIC INDUSTRIES, INC. (3)
5,751,585 High speed, high accuracy multi-stage tool positioning system 100 1996
5,847,960 Multi-tool positioning system 71 1996
5,798,927 Apparatus and method for coordinating the movements of stages in a multi-stage multi-rate positioner system 26 1997
 
SAMSUNG ELECTRONICS CO., LTD. (3)
6,958,879 Method and apparatus reducing off track head motion due to disk vibration in a hard disk drive using configuration of the disk drive servo controller 9 2003
7,502,191 Method and apparatus reducing off track head motion due to disk vibration in a hard disk drive through the head gimbal assembly 0 2005
7,595,964 Method for reducing off track head motion due to disk vibration in a hard disk drive through the head gimbal assembly 2 2006
 
HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V. (2)
6,216,050 Actuator control apparatus and magnetic disk unit 6 1998
6,417,982 System and method for identifying and filtering a head suspension assembly resonance frequency 18 1998
 
CANON KABUSHIKI KAISHA (1)
5,875,162 Optical information recording and/or reproducing apparatus improved in servo characteristics 4 1996
 
FUJITSU LIMITED (1)
6,519,496 Feedback controller, digital filter device, and storage device 3 1999
 
HITACHI ASIA LTD. (1)
8,412,360 Method and system for robust attenuation of mechanical resonances using a multi-rate low pass filter 0 2010
 
Kabushiki Kaisha Kawai Gakki Seisakusho (1)
5,668,340 Wind instruments with electronic tubing length control 13 1994
 
PAR SYSTEMS, INC. (1)
6,026,970 Telescoping tube assembly 11 1999