Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-10-10
2006-10-10
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07119979
ABSTRACT:
A method for measuring the clearance of a slider over a rotating disk by inducing a collision between the slider and the disk is described. After the normal flying height of the slider is established, the slider is driven into a collision with the rotating disk surface by applying a DC or AC voltage between the slider and the disk. The clearance data can be extracted from the induced collision by measuring a parameter, such as the change in the amplitude of the readback signal from the magnetic sensor, which is related to fly-height at the normal fly-height and at the disk surface. The two data points can then be used to derive the clearance. One embodiment uses a single beam interferometer to derive the vibrational displacement of the collision event.
REFERENCES:
patent: 5567864 (1996-10-01), Coon et al.
patent: 5673110 (1997-09-01), Erickson et al.
patent: 6417981 (2002-07-01), Smith
patent: 6590667 (2003-07-01), Lee et al.
patent: 2001/0035960 (2001-11-01), Johnston
patent: 2002/0001151 (2002-01-01), Lake
patent: 2002/0071196 (2002-06-01), Chapin et al.
patent: 2002/0097517 (2002-07-01), Bonin et al.
patent: 2002/0176185 (2002-11-01), Fayeulle et al.
patent: 2003/0007279 (2003-01-01), Johnson et al.
patent: 2003/0058559 (2003-03-01), Brand et al.
patent: 2003/0067698 (2003-04-01), Dakroub et al.
patent: 2005/0105203 (2005-05-01), Zhu et al.
J. Xu and R. Tsuchiyama, “Ultra-low-flying-height design from the viewpoint of contact vibration”, Tribiology International 36 (2003), pp. 459-466.
Fong Walton
Gillis Donald Ray
Knigge Bernhard E.
Pit Remmelt
Suk Mike
Hitachi Global Storage Technologies - Netherlands B.V.
Hudspeth David
Knight G. Marlin
Slavitt Mitchell
LandOfFree
Measurement of slider clearance by inducing collision of the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Measurement of slider clearance by inducing collision of the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measurement of slider clearance by inducing collision of the... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3680427