1. Field
The present invention relates to disk drives for computer systems. In particular, the present invention relates to a disk drive comprising a double sided flex circuit wherein a first side lead provides an etching mask for a second side lead.
2. Description of the Related Art
As the data rate in disk drives increases into the microwave region, the transmission properties of the electrical leads for carrying the differential signals has become more significant. For example, it is desirable to reduce the impedance of the electrical leads in order to increase power efficiency as well as the signal-to-noise ratio (SNR) of the differential signal.
There is, therefore, a need in a disk drive to reduce the impedance of the electrical leads fabricated on a flex circuit in order to improve the power efficiency and SNR in transmitting differential signals along the electrical leads.
In the embodiment of
The flex circuit 28A may comprise electrical leads for carrying any suitable differential signal. In one embodiment, the head 24 comprises a magnetoresistive (MR) head comprising a write element having a first differential signal interface (e.g., 32A and 32B) and a read element having a second differential signal interface (e.g., 34A and 34B). As described above, it is desirable to reduce the impedance of the electrical leads carrying a differential signal in order to increase power efficiency as well as the signal-to-noise ratio (SNR) of the signals. The impedance can be reduced by increasing the capacitance between the electrical leads, and in the embodiment shown in
During the step of etching the electrical coating 40 applied to the first side of the substrate 30 to form the first electrical lead 32A as described above with reference to
Continuing now with
As seen in
This application is a divisional of U.S. patent application Ser. No. 11/933,759 filed on Nov. 1, 2007 the specification of which is incorporated herein by reference.
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