JPS5850479B2 - Chiyo Onpahon - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A conventional ultrasonic horn has a throat part a of a horn C whose diameter gradually increases from the throat part a to the opening part and whose diameter is approximately elliptical, as shown in FIG. The ultrasonic generation source d is housed and mounted inside the horn C, and the directivity characteristic is in the long axis direction of the aperture of the horn C (i.e., the directivity in the long axis direction of the aperture of the horn C at the throat of the horn with respect to the central axis of the horn C). When the relationship between the sound pressure Hh in the direction of line segments that intersect at an angle of α degree and the above α degree) is actually measured,
As shown in Fig. 1C, the sound pressure is large when the absolute value of α degrees is below a certain value, and when the absolute value of α degrees is above the above-mentioned certain value, the sound pressure Hh is small. That is, the relationship between the sound pressure Hv in the direction of a line that intersects the central axis of the horn C within the throat a of the horn C in the short axis direction of the diameter of the horn C at an angle of β degrees and the above β degree. ), we get
As shown in Figure 1, 2, when the absolute value of β degree is below a certain value, the sound pressure H
Even when v is large and the absolute value of the β degree is above the above-mentioned certain value, the sound pressure Hv greatly increases or decreases as the β degree increases, and there is a drawback that the directivity in the short axis direction of the aperture of the horn C is disturbed.

It is an object of the present invention to eliminate the above-mentioned conventional drawbacks and to make the directivity angle of the horn diameter in the long axis direction variable.

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 indicates a horn whose diameter gradually increases as it goes from the throat 2 to the opening 3, and the diameter is approximately elliptical. Reference numeral 4 indicates an ultrasonic generation source, such as a piezoelectric A pair of electrodes are appropriately attached to a crystal piece, and when a high frequency voltage is applied between the pair of electrodes, the piezoelectric crystal piece resonates with the high frequency voltage, vibrates elastically, and generates ultrasonic waves.

, an ultrasonic generator 4 is disposed within the throat 2 of the horn 1.

5 is a plate having a substantially elliptical hole 6 in the center, and is rotatably disposed within the throat 2 of the horn 1 in front of the ultrasonic generator 4.

Reference numeral 7 designates a knob protruding from the periphery of the plate 5, which is exposed for the outer periphery of the horn 1 through a sliding hole 8 in the peripheral body of the horn 1.
The plate 5 is rotated so that the long axis direction of the hole 6 is perpendicular to or parallel to the long axis direction of the diameter of the horn 10.

The present invention has the above-described configuration, and the long axis direction of the hole 6 is perpendicular to the long axis direction of the diameter of the horn 10, and the directivity characteristic in the long axis direction of the horn 1 (i.e., the directivity of the horn 1 with respect to the central axis of the horn 1 is When the relationship between the sound pressure Hh in the direction of the line segment intersecting the long axis direction of the horn 1 at an angle of α degree and the above α degree in the throat portion 2 of the When the absolute value of is below a certain value, the sound pressure Hh becomes thick (so, when the α degree is above the above certain value, the sound pressure Hh becomes small, which is the same as before, but the directivity in the short axis direction of the horn with a diameter of 10 ( That is, the sound pressure H■ in a line segment that intersects the central axis of the horn 1 at an angle of β degree in the direction of the minor axis of the horn 10 at the throat of the horn 1.
When the relationship between the β degree and the above β degree) is actually measured, as shown in curve B in Fig. 6, when the absolute value of the β degree is below a certain value, the sound pressure Hv is large, and when the absolute value of the β degree is above the above fixed value, the sound pressure Hv is low. The pressure Hv is reduced, and the directional characteristics in the short axis direction of the diameter of the horn 1 are no longer disturbed.

Next, the plate body 5 is rotated to make the long axis direction of the hole 6 parallel to the long axis direction of the horn 1, and the directivity characteristics in the long axis direction and the short axis direction of the aperture of the horn 1 are similarly measured. Then, the fifth
When the long axis direction of the hole 6 is perpendicular to the long axis direction of the diameter of the horn 1, the directivity characteristics in the long axis direction of the diameter of the horn 10 are as shown by the curve A' in the figure and the curve F in FIG. Curve A'
The directivity characteristic in the short axis direction of the horn 10 diameter becomes narrower as shown in the above curve.

In this way, the present invention houses the ultrasonic wave generation source 4 in the throat 2 of the horn 1, whose diameter gradually increases from the throat 2 toward the opening 3, and whose diameter is approximately elliptical. hole 6
Since the plate body 5 having a directional characteristic is rotatably mounted in the throat 2 of the horn 1 in front of the ultrasonic wave generation source 4, there is little disturbance in the directional characteristics (and the directivity angle of the directional characteristics is small). It has the effect of providing an ultrasonic horn that can make a huge difference.

[Brief explanation of the drawing]

FIG. 1 shows a conventional ultrasonic horn. FIG. 1A is a sectional view, FIG. 2 to 6 show embodiments of the present invention.
The figure is a front view, and Figure 3 is a sectional view taken along the Y-Y line of the same as above.
Figure 4 is a sectional view taken along the Z-Z line, Figures 5 and 6.
The figure is a directional characteristic diagram. 1 is a horn, 2 is a throat, 3 is an opening, 4 is an ultrasonic generation source, 5 is a plate, 6 is a hole, 7 is a knob, and 8 is a sliding hole.

Claims (1)

[Claims] 1 A plate that houses an ultrasonic generation source 4 in the throat 2 of a horn 1 whose diameter gradually increases from the throat 2 toward the opening 3 and has an approximately elliptical hole 6 in the center. body 5
The ultrasonic horn is rotatably mounted in the throat part 2 of the horn 1 in front of the ultrasonic generation source 4.