Rearward vehicle obstruction detector using modulated light from the brake light elements
US4891624A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1988 |
| Grant date | Jan 2, 1990 |
| Priority date | — |
| Expiry date | Mar 29, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60Q9/008
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The detection system for obstruction to vehicle according to the invention comprises a plurality of light emitting elements disposed in the rear of a car, a modulation for emitting modulation lights from the light emitting elements, light receiving elements for receiving the reflected light that the modulation light comes in contact with an external obstruction to reflection, a detection circuit for detecting output signals of the light receiving elements, thus detecting the obstruction from an output of the detection circuit, and a rearward obstruction can be detected securely particularly when the car moves backward, a new light source for obstruction detecting is not particularly required, and thus no area must be prepared for installation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.