JPS6325578A - Ultrasonic transmitter/receiver - Google Patents

Abstract

PURPOSE:To reduce direct penetration of an ultrasonic wave from the transmitting side to the receiving side, by providing a sound absorbing material between a ultrasonic wave transmitting horn and a receiving horn. CONSTITUTION:A conical horn 11 for transmitting ultrasonic waves and a conical horn 12 for receiving ultrasonic waves are arranged wide by side to be formed integral. Fitting parts 13 and 14 are provided at respective throats of the horns 11 and 12 and a sound absorbing material 15 is fixed between openings of the horns 11 and 12. This enables the absorption of those directly transmitted to the receiving side among transmitted ultrasonic signals due to effect of diffraction and reflection generated in a short range sound field thereby reducing the penetration of ultrasonic waves with a remarkable decrease in direct waves.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an ultrasonic transmitting/receiving device used in an obstacle detector or a distance meter using ultrasonic waves.

2. Description of the Related Art Conventionally, this type of ultrasonic transmitter/receiver has had a configuration as shown in FIG. In FIG. 2, reference numeral 1 denotes a horn member, which includes a transmitting parabolic horn 2 and a receiving parabolic horn 73 integrated in parallel, and mounting portions 4 and 5 formed at the throat of the horn. An ultrasonic transmitter 6 and an ultrasonic receiver 7 were fixed to the mounting portions 4 and 6 via cushioning materials 8 and 9, respectively.

Problems to be Solved by the Invention In such a conventional configuration, side lobes are generated by narrowing the directivity angle using a parabolic horn, and due to diffraction and reflection of the sound waves near the opening end of the horn, the transmitted ultrasonic waves are The signal goes directly to the receiving side, and a signal different from that reflected from the target object is received, causing a problem of malfunction.

The present invention solves these problems, and aims to provide an ultrasonic transmitter/receiver that can perform short-range measurements without ultrasonic waves directly circulating from the transmitting side to the receiving side.

Means for Solving the Problem In order to solve this problem, the present invention provides an ultrasonic transmitting horn and a receiving horn that are arranged in parallel and integrally formed, and a throat portion of the transmitting horn and the receiving horn An ultrasonic transmitter and an ultrasonic receiver are each fixed to the mounting portions of a horn member by providing a mounting portion and fixing a sound absorbing material between the open ends of the transmitting/receiving horn via a cushioning material. This is what I did.

Effect: With this configuration, if some of the ultrasonic waves emitted from the transmitting horn go around directly to the receiving side, the sound-absorbing material absorbs the ultrasonic waves and prevents diffraction and reflection in the near-field sound field. It will be considered as a legal matter.

Embodiment FIG. 1 is a sectional view of an ultrasonic transmitter/receiver according to an embodiment of the present invention, and the same parts as in FIG. 2 are given the same numbers. In FIG. 1, reference numeral 1o denotes a horn member, which is integrally molded with a transmitting conical horn 11 and a receiving conical horn 12 positioned in parallel, and has mounting portions 13 and 14 provided at the horn throats, respectively, and the horn opening end. The sound absorbing material 16 is fixed between the ties. Reference numeral 16 denotes a recessed portion for attaching the sound absorbing material 15. Here, the horn is a parabolic horn,
Even if an exponential horn or the like is used, the effects of the present invention can be obtained. In addition, conical hole 7 for transmission
11 and the receiving conical horn 12 may be provided in parallel, or may be tilted at a certain angle, and the opening ends may not be on the same plane, and if they are spaced apart at a certain interval, the level of the ultrasonic waves going around will be reduced. . As the sound absorbing material 16, a resin member having a large surface area, a foaming member, or the like can be used. Reference numeral 6 indicates an ultrasonic transmitter, and reference numeral 7 indicates an ultrasonic receiver, which are respectively attached to the mounting portions 13 and 14 of the horn member 10 via cushioning materials 8 and 9, which have a large surface area and are highly effective in absorbing vibrations. .

17.18 is a relay printed circuit board for taking out the shield wire 19.20, and 21.22 is a transmitter/receiver.

This is a lead wire that connects the printed circuit board 17 and the printed circuit board 17 and 18.

Effects of the Invention As described above, according to the present invention, by providing a sound-absorbing material between the transmitting horn and the receiving horn, direct reception of transmitted ultrasonic signals is reduced due to the effects of diffraction and reflection occurring in the near-field sound field. It can absorb signals transmitted to the side and significantly reduce direct waves. In addition, the horn has the effect of correcting the side lobes of the directivity that occur when all the directivity is designed, and stable transmission and reception of ultrasonic waves can be performed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an ultrasonic transmitting/receiving device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a conventional ultrasonic transmitting/receiving device. 6...Ultrasonic transmitter, 7...Ultrasonic receiver, 8°9...Buffer material, 1Q...Horn member, 11... ...conical horn for transmission, 1
2...For reception = 'Nical horn, 13.14.
...Mounting part, 16...Sound absorbing material, 16...
...Recess, 1st place, 18... Relay printed circuit board, 19.20... Shield wire, 21.22
······Lead. Name of agent: Patent attorney Toshio Nakao and one other person
1 Figure 2

Claims (1)

[Claims] An ultrasonic transmitting horn and a receiving horn are arranged in parallel and integrally formed, mounting portions are provided at the throats of the transmitting horn and the receiving horn, respectively, and a sound absorbing member is fixed between the open ends of the transmitting and receiving horns. An ultrasonic transmitting/receiving device comprising an ultrasonic transmitter and an ultrasonic receiver fixed to the mounting portion of a horn member, respectively, via a cushioning material.