Communications: electrical – Selective
Patent
1976-12-09
1978-12-26
Farley, Richard A.
Communications: electrical
Selective
340 3E, G01S 966
Patent
active
041318722
ABSTRACT:
An echo-type switch using ultrasonic wave for detecting any object present in a predetermined area with reliable operation irrespective of environmental variations or foreign waves. After the wave is once radiated, the detection is suspended for a fixed time period T.sub.1 and presence or absence of reflected wave received is confirmed during another period T.sub.2. If reflected wave is received in the period T.sub.2, this period is again set for further confirming if the received wave continues and, until absence of the received wave is confirmed after several times of the waves received during the period T.sub.2, next ultrasonic wave is not radiated. Only in case the reflected wave received continues for more than two of the periods, the presence of the object to be detected in the area is indicated.
REFERENCES:
patent: 3474400 (1969-10-01), Auer, Jr. et al.
patent: 3500302 (1970-03-01), Moss, Jr. et al.
Inoue Hiromitsu
Katayama Susumu
Ohashi Hiroshi
Farley Richard A.
Matsushita Electric & Works Ltd.
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