JPS5934223Y2 - Non-splash-proof ultrasonic transducer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an ultrasonic transducer that emits ultrasonic waves in all weather conditions to measure the approach distance of a moving object such as a car, and further receives the reflected waves.

Ultrasonic micro hobs/speakers are used as ultrasonic transmitting/receiving elements, but there are two types depending on their structure: non-drip-proof and drip-proof. A drip-proof type is usually adopted to prevent the adhesion and intrusion of such substances.

However, the drip-proof type has the following disadvantages compared to the non-drip-proof type.

That is, (1) the drive time required to reach the maximum amplitude at 1 is long, making it unsuitable for short-distance measurements.

(2) The frequency (at maximum amplitude) fluctuates significantly due to temperature changes.

(3) Drive power is large.

etc. The present invention provides an ultrasonic transducer that enables use of non-drip-proof elements in all weather conditions, expands the directivity range of ultrasonic waves, and further improves vibration isolation performance.

The case where the present invention is used for measuring the distance to the rear of a car will be explained below.

The product 1 is an integrally molded product made of rubber or soft plastic, and a wave transmitting section 2 and a wave receiving section 3 are provided in close proximity and symmetrically.

Since the shape and structure of the wave transmitting section and the wave receiving section are the same except that their positional relationship is symmetrical, only one of them will be described below.

Reference numeral 4 denotes a microphone speaker mounting portion located at the upper end, into which a microphone speaker 5 is fitted in a watertight manner.

Reference numeral 6 represents a communication hole forming a waveguide portion, and reference numeral 7 represents an opening opening to the front.

The waveguide section 6 consists of a horizontal section 8 parallel to the horizontal center axis of the opening, a bent section 9, and a vertical section 10 perpendicular to the microphone speaker mounting section.

The bending angle of the bent portion is preferably 90' or less, and better performance results can be obtained if the waveguide portion is formed vertically as a whole up to the opening.

Further, the shape of the opening may be circular instead of rectangular, but it is preferable that only the outer wall 11 of the waveguide is curved and expanded outward.

Although the microbon speaker 5 installed in the above-mentioned product has a non-drip-proof structure, as mentioned above, it is installed facing downward or slightly rearward with respect to the opening through the bent part, so that raindrops may not be present. Since it does not infiltrate and is resistant to dust and other forces, it can be used outdoors even under harsh conditions without any problems.

The effective sensing range (measured with a 50CrrIX 50cm board standing upright) is as shown in Figure 6 when the main body is housed in a case and mounted on the rear bumper 21 of the vehicle 20 as shown in Figure 6. Because there is 3.5m' behind the vehicle! In addition to being able to detect obstacles with high precision, the sensing range at short distances is expanded to the left and right, allowing safe visibility even around curves.

Incidentally, since the sensing range of the drip-proof type is a cone-shaped range of about 3 d), it is clear that the safety at close range is inferior to that of the main business.

Furthermore, since the sensing range in the vertical direction of the main surface is as shown in FIG. 7, it is safe even on inclined surfaces.

Of course, for large vehicles, two or more can be used.

[Brief explanation of the drawing]

Figure 1 is a front view of the main business, Figure 2 is a plan view, Figure 3 is a side view, Figure 4 is a sectional view taken along line A-A in Figure 1, and Figure 5 is taken along line B-B in Figure 4. A vertical cross-sectional view, FIG. 6 is a diagram showing the state of use in the main business and the sensing range in the horizontal direction, and FIG. 7 is a diagram showing the sensing range in the vertical direction. 4 is a microphone speaker attachment part, 6 is a conductive tube part, 7
is an opening, 8 is a horizontal portion, 9 is a bent portion, and 10 is a vertical portion.

Claims (1)

[Scope of utility model registration request] A pair of non-splash-proof ultrasonic wave transmitting/receiving elements is connected to a plurality of mounting parts in which a pair of non-splash-proof ultrasonic wave transmitting/receiving elements are fitted symmetrically downward at a predetermined interval, and the vertical part is perpendicular to the end face of each of the elements. A rectangular waveguide section is formed through a bent section bent at an angle of less than 900 degrees at 1 to reach the horizontal opening, and only the outer wall of the opening is curved and enlarged outward so that the entire An ultrasonic transducer made of rubber or soft plastic.