Object detecting switch device
US5177711A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Apr 16, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/903
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.