Magnetic disk device having mechanism for detecting projections on recording medium
US8144412B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 2009 |
| Grant date | Mar 27, 2012 |
| Priority date | — |
| Expiry date | Mar 16, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/6005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thin film magnetic head includes a medium projection detection mechanism that detects a projection on the surface of a recording medium. The medium projection detection mechanism has a discharging electrode, a capacitor, and an input line and an output line that are connected to the discharging electrode. The discharging electrode is configured to receive a voltage applied through the input line, and the capacitor is configured to store electric charge by the applied voltage. The output line is connected to a projection detection processing system and is connected to the charging electrode and the projection detection processing system to detect the location of the projection that is a detection target by detecting voltage change that is caused by discharging between the discharging electrode and the projection when the projection is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.