Switchable shunts for integrated lead suspensions

Details Switchable shunts for integrated lead suspensions Switchable shunts for integrated lead suspensions

2000-08-31

2003-02-11

Luebke, Renee (Department: 2833)

Electricity: circuit makers and breakers

Multiple circuit control

Reciprocating contact

C360S245800, C200S250000

Reexamination Certificate

active

06518521

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to electrical shunts in integrated lead suspensions.
BACKGROUND OF THE INVENTION
Integrated lead suspensions and components (such as flexures) for supporting read and/or write heads in disk drives are well known and in widespread use. So-called “subtractive” type integrated lead suspensions and associated methods for manufacturing the suspensions from laminated sheets of material are disclosed, for example, in the Bennin et al. U.S. Pat. Nos. 5,598,307 and 5,844,751.
Magneto restrictive (MR) and giant magneto restrictive (GMR) heads are commonly mounted to the suspensions. Heads of these types are very sensitive to damage due to “blown fuse” syndrome and electrostatic discharges (ESD). To minimize this damage, the leads of the heads themselves and/or the integrated leads on the suspensions can be electrically shunted (i.e., interconnected or shorted) during manufacturing operations. The stainless steel (i.e., spring metal) layer of the suspension or flexure also is sometimes electrically interconnected to one of the integrated leads to couple the stainless steel layer to ground potential.
It is sometimes necessary to conduct tests of the integrated leads and/or the heads. Any shunts on the leads must typically be removed before the tests can be performed. The leads and heads must be reshunted following the tests if it is again desired to protect the heads from damage. A number of approaches for shunting and reshunting MR and GMR heads, or otherwise electrically coupling the leads to the stainless steel layer during the various stages of the head suspension assembly manufacturing operations are known and disclosed, for example, in the following references.
Inventor
Document No.
Bajorek et al.
U.S. Pat. No. 5,465,186 360/113
Arya et al.
U.S. Pat. No. 5,710,682 360/106
Johansen et al.
U.S. Pat. No. 5,877,933 361/220
Kanda
U.S. Pat. No. 5,991,121 360/104
Zarouri et al.
U.S. Pat. No. 6,034,851 360/137
Albrecht et al.
U.S. Pat. No. 6,052,258 360/104
Hiraoka et al.
U.S. Pat. No. 6,075,676 360/104
Yim et al.
U.K. 2,343,304
There remains a continuing need for improved shunts. To be commercially viable, the shunts should be efficient to manufacture and use. Shunts which can be conveniently reused would be especially desirable.


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