Magnetic disk drive, preamplifier for magnetic disk drive, flexible printed cable assembly for magnetic disk drive
US7630160B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 2008 |
| Grant date | Dec 8, 2009 |
| Priority date | — |
| Expiry date | Jan 23, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B33/121
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Embodiments of the present invention help to improve the cost, mountability, and reliability of a magnetic disk drive that regulates a fly height of a magnetic head slider correspondingly to the operating altitude of the drive by using an air pressure sensor and a heater. According to one embodiment, a preamplifier is a semiconductor chip formed by three-dimensionally laminating thin film circuits on a bulk silicon wafer. An air pressure sensor is integrally formed on the semiconductor chip through a semiconductor process. The air pressure sensor is configured to include an isolating cavity, a diaphragm that deflecting in response to a change in a pressure difference between the isolating cavity and the outside, and lower and upper electrodes and for detecting variation in electrostatic capacitance. The preamplifier including the air pressure sensor integrally formed therein is attached to a flexible printed cable (FPC) to oppose the FPC. A through-hole is provided in a portion opposite the air pressure sensor of the FPC to introduce air pressure in an operating environment into a diaphragm of the air pressure sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.