Hard disk drive suspension with reduced PSA change due to humidity and temperature variations
US8441761B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 2011 |
| Grant date | May 14, 2013 |
| Priority date | — |
| Expiry date | Aug 18, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/4833
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a disk drive suspension circuit, in order to improve stability of the stable pitch static attitude (PSA) over changes in humidity, the suspended portion of the flexible circuit and/or the gimbal support arm are modified to change their response(s) to humidity. In one embodiment, hygroscopic material such as the material of the insulating layer are added to the stainless steel gimbal support arm, so that in response to humidity it bends in the opposite direction as the suspended portion of the circuit. In another embodiment, additional hygroscopic material is added to the circuit, and/or the polyimide insulating layer or the coverlayer are selectively removed, so that the net bend in the suspended portion of the circuit over humidity is reduced, ideally to a condition of zero or close to zero net bending.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.