Distance measuring equipment
US5627636A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1995 |
| Grant date | May 6, 1997 |
| Priority date | — |
| Expiry date | Feb 21, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/497
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A distance measuring equipment which is useful in, for example, a collision prevention system wherein a laser beam is forward emitted from a vehicle to measure a distance between the vehicle and a forward vehicle, and an alarm is produced when the present vehicle abnormally approaches the forward vehicle. In the distance measuring equipment, when a correction instruction signal is supplied, a distance calculating circuit first drives an optically shielded light emitting element for correction to emit light, and produces a correction signal on the basis of a signal input into an adder connected to a light receiving element. Thereafter, the distance calculating circuit drives a light emitting element for measurement to emit light, and produces a distance measurement signal with referring the correction signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.