Proximity detector

Details Proximity detector Proximity detector

1994-03-14

1995-03-07

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503381, G08B 1319

Patent

active

053960700

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 has 3 transmitter elements housed behind a common aperture, and each receiver unit has 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 indicating device indicates the amplitude of the combined signal from the receivers by means of a pulsed tone the pulse frequency of which is varied.

REFERENCES:
patent: 4240152 (1980-12-01), Duncan et al.
patent: 4528563 (1985-07-01), Takeuchi
patent: 4561064 (1985-12-01), Beuggen et al.
patent: 4888532 (1989-12-01), Josson
patent: 4967083 (1990-10-01), Kornbrekke et al.

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