Piezoelectric film attached suspension for detecting disk flutter and reducing track misregistration

To increase the recording density of hard disk drives, high accuracy of head positioning is required. But disk flutter, which is airflow induced vibration, is a major contributor to head positioning error. For detecting disk flutter, we proposed a suspension to which a PVDF film sensor was attached,...

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Veröffentlicht in:	Microsystem technologies 2009-10, Vol.15 (10-11), p.1509-1513
Hauptverfasser:	Ohtsuka, Shinichi, Koganezawa, Shinji, Hara, Takeyori, Funabashi, Kei, Matsuzawa, Takuji
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Electronics Electronics and Microelectronics Engineering Exact sciences and technology Instrumentation Instruments, apparatus, components and techniques common to several branches of physics and astronomy Magnetic and optical mass memories Mechanical Engineering Mechanical engineering. Machine design Mechanical instruments, equipment and techniques Microelectronic fabrication (materials and surfaces technology) Micromechanical devices and systems Nanotechnology Physics Precision engineering, watch making Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Storage and reproduction of information Technical Paper
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Beschreibung
Zusammenfassung:	To increase the recording density of hard disk drives, high accuracy of head positioning is required. But disk flutter, which is airflow induced vibration, is a major contributor to head positioning error. For detecting disk flutter, we proposed a suspension to which a PVDF film sensor was attached, and built the suspension into an actual HDD. Comparing the power spectrum of disk vertical vibration with that of the PVDF film sensor output, disk flutter was well detected. We also implemented a feedforward controller and confirmed that the influence of disk flutter on position error signal is considerably suppressed.
ISSN:	0946-7076 1432-1858
DOI:	10.1007/s00542-009-0797-2