Ultrasonic rangefinder
First Claim
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1. An ultrasonic rangefinder comprising:
- ultrasonic wave transmitting means having a transmitting surface,ultrasonic wave receiving means having a receiving surface,at least one of the wave transmitting means and the wave receiving means further including;
(a) a horn; and
(b) a straight tubular section provided between at least one of the transmitting surface and receiving surface and said horn, said straight tubular section being shaped to satisfy the condition x=k(r2 /λ
)wherein x is the length of the straight tubular section, r is the radius of the at least one of the transmitting surface and receiving surface, λ
is the wave length of the ultrasonic wave signal and k is a constant.
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Accused Products
Abstract
An ultrasonic rangefinder capable of detecting a distance between a vehicle and an object with high accuracy is shown. The measurements for microphones for transmitting and receiving ultrasonic waves are chosen so that detour waves are restricted.
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Citations
9 Claims
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1. An ultrasonic rangefinder comprising:
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ultrasonic wave transmitting means having a transmitting surface, ultrasonic wave receiving means having a receiving surface, at least one of the wave transmitting means and the wave receiving means further including; (a) a horn; and (b) a straight tubular section provided between at least one of the transmitting surface and receiving surface and said horn, said straight tubular section being shaped to satisfy the condition x=k(r2 /λ
)wherein x is the length of the straight tubular section, r is the radius of the at least one of the transmitting surface and receiving surface, λ
is the wave length of the ultrasonic wave signal and k is a constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification