Dynamic magnetic information storage or retrieval – Head mounting – For adjusting head position
Reexamination Certificate
2011-07-19
2011-07-19
Renner, Craig A. (Department: 2627)
Dynamic magnetic information storage or retrieval
Head mounting
For adjusting head position
Reexamination Certificate
active
07983008
ABSTRACT:
A piezoelectric actuated suspension with passive damping is disclosed for precision positioning of hard disk drive while reducing undesired shock vibrations. Along the longitudinal axis of an etched suspension, two piezoelectric actuators dispose near the base plate to provide a push-pull motion. The actuators have two main portions. The first portion is piezoelectric elements to provide active positioning. The second portion is viscoelastic damping layers underneath the piezoelectric elements for passive damping. The complementary parts such as stiff edge elements and optional soft boundary covers are used to enhance the actuating abilities of the actuators and prevent any contaminants of the viscoelastic layers from going into the clean sealed chamber of the hard disk drive, respectively. The present invention further relates to a dual-stage servo system in a hard disk drive for fine positioning of the read/write head and better shock resistance via the piezoelectric actuated suspension with passive damping.
REFERENCES:
patent: 5315203 (1994-05-01), Bicos
patent: 5485053 (1996-01-01), Baz
patent: 5838092 (1998-11-01), Wang et al.
patent: 6268983 (2001-07-01), Imada et al.
patent: 6297933 (2001-10-01), Khan et al.
patent: 6404600 (2002-06-01), Hawwa et al.
patent: 6421211 (2002-07-01), Hawwa et al.
patent: 6512659 (2003-01-01), Hawwa et al.
patent: 6680826 (2004-01-01), Shiraishi et al.
patent: 6760194 (2004-07-01), Shiraishi et al.
patent: 6807030 (2004-10-01), Hawwa et al.
Liao et al., “Characteristics of Enhanced Active Constrained Layer Damping Treatments With Edge Elements, Part 2: System Analysis”, Transactions of the ASME, Oct. 1998, vol. 120, pp. 894-900.
Liao et al., “A new active constrained layer configuration with enhanced boundary actions”, Smart Material Structures, Aug. 19, 1996, vol. 5, pp. 638-648.
Chan et al., “Active-passive hybrid piezoelectric actuators for high precision hard disk drive servo systems,” Proc. of SPIE vol. 6173, pp. 617303-1 thru 617303-10, 2006.
Chan et al., “Precision Positioning of Hard Disk Drives Using Piezoelectric Elements,” Proceedings of the 15thInternational Conference on Adaptive Structures and Technologies, Oct. 25, 2004, 12 pages.
K. W. Chan, W. H. Liao, and I. Y. Shen, “Precision Positioning of Hard Disk Drives Using Piezoelectric Elements,” Proceedings of 15th International Conference on Adaptive Structures and Technologies, Oct. 25, 2004.
K. W. Chan and W. H. Liao, “Active-Passive Hybrid Piezoelectric Actuators for High-Precision Hard Disk Drive Servo Systems,” Proceedings of SPIE Conference on Smart Structures and Materials, SPIE vol. 6173, pp. 617303.01-617303.10, 2006.
Chan Kwong-Wah
Liao Wei-Hsin
Evan Law Group LLC
Garcia Carlos E
Renner Craig A.
The Chinese University of Hong Kong
LandOfFree
Piezoelectric actuated suspension with passive damping in... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Piezoelectric actuated suspension with passive damping in..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Piezoelectric actuated suspension with passive damping in... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2642850