Dynamic magnetic information storage or retrieval – Head mounting – Disk record
Reexamination Certificate
2001-04-16
2004-03-30
Klimowicz, William (Department: 2652)
Dynamic magnetic information storage or retrieval
Head mounting
Disk record
C360S244200, C360S244300, C360S244900, C360S245800, C360S245900
Reexamination Certificate
active
06714385
ABSTRACT:
BACKGROUND OF THE INVENTION
In the past, it has been known to use printed circuit electrical traces on a head suspension for disk drives. The head suspension itself is typically formed of steel, and serves as a supporting structure for the traces, separated therefrom by a thin insulator layer. The metallic nature of the supporting structure or layer affects both the differential mode impedance and the common mode impedance with respect to the electrical traces which are used to carry signals between a read/write head carried on the suspension and related circuitry off the suspension.
To address these issues, it has been known to remove one or more portions of the metallic layer to alter the impedances affecting the traces. Such removed portions have been informally known as “windows.”
The present invention relates to an apparatus and method for controlling the common mode impedance, typically increasing the value thereof, while allowing independent control of the differential mode impedance. This is accomplished by providing at least some windows with electrically isolated islands or “doors” therein to enable an increase in the common mode impedance while maintaining a desired level of differential mode impedance.
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Accurate Quasi-Tem Analysis of Modified Coupled Suspended Microstriplines and its Application to Directional Coupler Design; Masot, F., Medina, F., and Horno, M.; Microwave and Optical Technology Letters; vol. 4, No. 2, Jan. 20, 1991; pp. 66-72.
Even Marc A.
Webb, Jr. Larry C.
Faegre & Benson LLP
Hutchinson Technology Inc.
Klimowicz William
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