Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2004-08-20
2009-12-15
Young, Wayne R (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044320
Reexamination Certificate
active
07633839
ABSTRACT:
A control circuit creates a self-sensing active-damping voice coil. The control circuit includes a current sensor coupled to a voice coil. A first filter is coupled to the current sensor to create an error voltage that is proportional to the integral of an external acceleration applied to the voice coil. A second filter with a lead-lag component is coupled to the error voltage to create a voltage applied to the voice coil that substantially cancels the external acceleration below a pole defined by a lead-lag component thereby damping the external accelerations.
REFERENCES:
patent: 4914725 (1990-04-01), Belser et al.
patent: 5296790 (1994-03-01), Fincher
patent: 5299075 (1994-03-01), Hanks
patent: 5447051 (1995-09-01), Hanks et al.
patent: 5449986 (1995-09-01), Dozor
patent: 5548192 (1996-08-01), Hanks
patent: 5550685 (1996-08-01), Drouin
patent: 6222336 (2001-04-01), McKenzie et al.
patent: 6538966 (2003-03-01), Hanks
patent: 6570360 (2003-05-01), Freeman
patent: 6646410 (2003-11-01), Rich et al.
patent: 6674705 (2004-01-01), Hanks
patent: 6690534 (2004-02-01), Ding et al.
patent: 6693764 (2004-02-01), Sheh et al.
patent: 6721260 (2004-04-01), Hanks
patent: 6741529 (2004-05-01), Getreuer
patent: 6795268 (2004-09-01), Ryan
patent: 2001/0017827 (2001-08-01), Chu
patent: 2002/0001153 (2002-01-01), Maiocchi
patent: 2004/0080860 (2004-04-01), Inaji et al.
patent: 2004/0240101 (2004-12-01), Inaji et al.
patent: 0 559 397 (1993-09-01), None
patent: 0 568 768 (1993-11-01), None
patent: 0 572 789 (1993-12-01), None
patent: 63-070933 (1988-03-01), None
Yamaguchi et al, “Recent Control Technologies for Fast and Precise Servo System of Hard Disk Drives”, 2000 IEEE, pp. 69-73.
W. Marshall Leach, “Loudspeaker Voice-Coil Inductance Losses: Circuit Models, Parameter Estimation, and Effect on Frequency Response”, Jrnl of the Audio Engineering Society, V. 50(6), Jun. 2002, pp. 442-449.
D.J. Leo et al, “A Self-Sensing Technique for Active Acoustic Attenuation”, Jrnl of Sound and Vibration, (2000( 235(5), 863-873.
Jon Pratt et al, “Development and Analysis of a Self-Sensing Magnetostrictive Actuator Design”, SPIE/ASME/SEM North American Conference on Smart Structures, Feb. 1993.
Chow Lixi
Hewlett--Packard Development Company, L.P.
Young Wayne R
LandOfFree
Self-sensing active-damping voice coil does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Self-sensing active-damping voice coil, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-sensing active-damping voice coil will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4057502