Determining optical degradation in a heat-assisted read/write head
US9548068B1 · kind B1 · utility
2Cited by
8References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2015 |
| Grant date | Jan 17, 2017 |
| Priority date | — |
| Expiry date | Sep 15, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A change in an optical energy profile of energy emitted from a read/write head is determined. The read/write head includes an optical transmission path that emits the energy to heat a heat-assisted recording medium during writing. A change in optical efficiency of the read/write head is also determined. Based on the change in the optical energy profile and the change in the optical efficiency, a change in the effectiveness of the read/write head is determined, and in response a mitigation is performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.