Proximity detector
US5319201A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1992 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Jan 31, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60Q9/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A proximity detector for motor cars, to aid parking, has 3 infra-red transmitter units 10-1 to 10-3 producing a zone of radiation 36 and two receiver units 20-1 and 20-2 producing a zone 46 of sensitivity to the radiation. Each transmitter unit comprises 3 transmitter elements housed behind a common aperture, and each receiver unit comprises 2 receiver elements housed behind a common aperture, giving for each unit a polar diagram with at least two distinct directions of high magnitude, the axes of peak radiation or sensitivity from the elements of a unit being divergent through the aperture and forming the directions of high magnitude. An indicator indicates the amplitude of the combined signal from the receivers by providing a pulsed tone the pulse frequency of which is varied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.