JPS5811155B2 - ultrasonic horn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The conventional ultrasonic horn has a throat part a, as shown in FIG.
An ultrasonic transducer d is attached to the throat part a of the horn C, which is flat and whose diameter gradually increases as it goes toward the opening. The result of actually measuring the sound pressure h1 in a direction forming an angle of α1 degree to the long axis direction of the diameter of the horn C is as shown in Fig. 1 C, and the throat part a of the horn C is The result of actually measuring the sound pressure h2 in a direction making an angle of 43 degrees to the short axis direction of the diameter of the horn C is as shown in Fig. 1D, and in particular, as the angle α2 increases, the sound pressure h2 increases and decreases greatly. However, it had the disadvantage of poor directional characteristics.

The present invention eliminates the above-mentioned drawbacks of the conventional technology, and the embodiments of the present invention will be described below with reference to the drawings.
4 is a horn whose diameter gradually increases from the throat 2 to the opening 3; 4 is a cylindrical body whose tip is integrally connected to the throat 2 of the horn 1; The circumferential barrel is made into the reduced diameter portions 4a, 4'a, and the inner circumferential shell at the intermediate portion is made into the enlarged diameter portion 4b. A partition plate 6 having an elongated hole 5 is provided so that the long axis direction of the elongated hole 5 is perpendicular to the long axis direction of the diameter of the horn 1.

7 is an ultrasonic vibrator, which consists of a piezoelectric crystal piece with a pair of electrodes appropriately attached to it. When a high frequency voltage is applied between one electrode, the piezoelectric crystal piece vibrates and generates ultrasonic waves. It is attached to the base end of the cylindrical body 4.

The present invention has the above-described configuration, and the sound pressure H1 in a direction forming an angle of β1 degree in the long axis direction of the aperture of the horn 1 at the throat portion 2 of the horn 1 with respect to the central axis 1a of the horn 1 is measured. is as shown in FIG. 4, and the central axis 1a of the horn 1 is
On the other hand, the result of actually measuring the sound pressure H2 in the throat part 2 of the horn 1 in a direction forming an angle of β2 degrees with the short axis direction of the diameter of the horn 1 is as shown in FIG. 5, and the result is as shown in FIG. When β2 becomes a predetermined value or more, the sound pressures H1t and H2 become small and do not increase or decrease significantly, resulting in good directivity characteristics.

In this way, the present invention connects the tip of the cylindrical body 4 integrally to the throat 2 of the horn 1, which is flat and whose diameter gradually increases as it goes from the throat 2 to the opening 3. The inner circumference of the inner circumference of the part is made into the reduced diameter part 4a, 4'a, the inner circumference of the middle part is made into the enlarged diameter part 4b, and the inner circumference of the middle part of the reduced diameter part 4a of the tip part of the cylindrical body 4 is made. A partition plate 6 having an elongated hole 5 is provided so that the long axis direction of the elongated hole 5 is perpendicular to the long axis direction of the diameter of the horn 1, and an ultrasonic vibrator 7 is attached to the base end of the cylindrical body 4. As can be seen from the actual measurement results,
This has the effect of improving directional characteristics.

[Brief explanation of the drawing]

FIG. 1A is a sectional view of a conventional ultrasonic horn, FIG. 2 is a directional characteristic diagram of a conventional ultrasonic horn, FIG. 2 is a sectional view of an embodiment of the present invention, FIG. 3 is a sectional view taken along the Y-Y line of the same, and FIGS. It is a directional characteristic diagram of a sonic horn. 1 is a horn, 2 is a throat, 3 is an opening, 4 is a cylindrical body, 4
a, 4'a are reduced diameter parts, 4b is an enlarged diameter part, 5 is an elongated hole, 6 is a partition plate, and 7 is an ultrasonic transducer.

Claims (1)

[Claims] 1. The tip of the cylindrical body 4 is integrally connected to the throat 2 of the horn 1, which is flat and whose diameter gradually increases as it goes from the throat 2 to the opening 3. A partition having reduced diameter parts 4a, 4'a and an inner circumferential body at the middle part as an enlarged diameter part 4b, and having an elongated hole 5 in the inner circumferential body at the middle part of the reduced diameter part 4a at the tip of the cylindrical body 4. This ultrasonic horn is formed by providing a plate 6 so that the long axis direction of the elongated hole 5 is perpendicular to the long axis direction of the diameter of the horn 1, and installing an ultrasonic vibrator 7 at the base end of the cylindrical body 4.