Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1986-02-28
1987-06-16
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
340904, 367108, 367909, G01S 1593
Patent
active
046740732
ABSTRACT:
A plurality of ultrasonic transmitting elements and ultrasonic receiving elements are provided and are electrically switched in a sequential manner to change a region over which the existence of an object is to be detected, thus allowing the existence of an object to be detected over an extended range. The distance to the object and a particular region in which it is detected are displayed. The ultrasonic transmitting elements and the ultrasonic receiving elements are alternately disposed in a linear array. When switching the region over which the existence of an object is to be detected, the switching of the ultrasonic transmitting elements takes place in an alternate fashion with the switching of the ultrasonic receiving elements, thus changing the region at an interval corresponding to one pitch with which the elements are disposed in the array.
REFERENCES:
patent: 2797399 (1957-06-01), Camp et al.
patent: 4240152 (1980-12-01), Duncan et al.
patent: 4278962 (1981-07-01), Lin
patent: 4490716 (1984-12-01), Tsuda et al.
Aisin Seiki Kabushiki Kaisha
Farley Richard A.
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