Distance measuring device
US5077701A · kind A · utility
10Cited by
2References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1990 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | Nov 13, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/529
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention relates to a distance measuring device, in particular for motor vehicles, in which a converter is utilized for transmission of an ultrasonic signal and also for reception of the echo signal. Thereby the echo signal received by the converter is compared at a comparator with a threshold value after having been appropriately amplified. This threshold value is at a particular changeover time changed over from a first high value, which is independent of time, to a smaller, time-dependent value. Thereby the changeover time is computed from a measured time depending on the dying-out behavior of the converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.