Method and apparatus for reducing blind spots in obstacle...

Details Method and apparatus for reducing blind spots in obstacle... Method and apparatus for reducing blind spots in obstacle...

2006-01-03

2006-01-03

Nguyen, Phung (Department: 2632)

Communications: electrical

Land vehicle alarms or indicators

Of relative distance from an obstacle

C340S539100, C340S903000, C340S625000, C342S088000

Reexamination Certificate

active

06982634

ABSTRACT:
A method and apparatus for reducing blind spot in obstacle detection as a vehicle moves in reverse relate to widening the transmission angle on two sets of ultrasonic transducers located at the rear of the vehicle. Signal transmission and reception of these two transducers are operated by a transducer control circuit that uses a channel switching means to permit only one transducer to be in a transmission mode and one transducer to be in a reception mode at any given moment. At the same time, the control circuit shuts off ringing signals remaining in a predetermined time frame to avoid signal cross talk from the transmitting transducer to the receiver transducer, which would trigger false alarms.

REFERENCES:
patent: 4349823 (1982-09-01), Tagami et al.
patent: 4467313 (1984-08-01), Yoshino et al.
patent: 5574426 (1996-11-01), Shisgal et al.
patent: 6215415 (2001-04-01), Schroder
patent: 6307622 (2001-10-01), Lewis
patent: 6496153 (2002-12-01), Boulesteix

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