Object detecting switch device
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United States of America Patent
Stats
-
Jan 5, 1993
Issued Date -
N/A
app pub date -
Apr 16, 1991
filing date -
Sep 2, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This switch device for detecting an object comprises a transducer for emitting and receiving ultrasonic signals to and from an object, a transmitter for driving the transducer, a receiver for receiving a signal from the transducer, a gate for detecting a short-distant object, a gate for detecting a long-distant object, and a circuit for setting the timings of the gates in accordance with the detecting ranges of the object. Another switch device is disclosed for detecting an object which comprises a transducer for emitting and receiving ultrasonic signals to and from an object, a transmitter for driving the transducer, a receiver for receiving a signal from the transducer, a suppression gate for preventing detection of a reflected ultrasonic pulse during the transducer residual vibration period, a detectable distance gate for determining the range of detectable distances, an amplitude comparator for preventing detection of reflected ultrasonic pulses having an amplitude below a threshold value, and a plurality of window pulses for enabling detection of a reflected ultrasonic pulses at various distances.
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