Suspension circuit trace employing stacked traces and windowed stainless steel layer
US9330693B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2014 |
| Grant date | May 3, 2016 |
| Priority date | — |
| Expiry date | Sep 19, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/484
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electrical circuit for a disk drive suspension has a first signal trace above a grounded support layer which is typically stainless steel, and a second signal trace below the support layer, the two signal traces typically being opposite polarities of a differential signal pair. The support layer between the two signal traces is windowed, and the two traces are physically separated by a distance that equals the nominal thickness of the support layer plus the thicknesses of the top and bottom dielectric layers that separate the signal traces from the support layer. The physical separation combined with the windowing reduces the impedance and increases the bandwidth of the differential pair. The impedance can be controlled by the percentage of windowing in the support layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.