Navigation apparatus for vehicle
US8112221B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 2008 |
| Grant date | Feb 7, 2012 |
| Priority date | — |
| Expiry date | Dec 8, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an in-vehicle navigation apparatus, a present position is detected, an altitude of the present position is acquired from map data, and a temperature inside of a hard disk drive is acquired with a temperature sensor. An atmospheric pressure of the present position is then calculated from the altitude and temperature. When the calculated atmospheric pressure is less than a predetermined atmospheric pressure, it is presumed that a magnetic head cannot be floating against a magnetic disk in the hard disk drive. Access to the hard disk drive is thereby prohibited. Thus, in the hard disk drive of the navigation apparatus, contact between the magnetic head and the magnetic disk is prevented when running a place with a low atmospheric pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.