JPS59200598A - Variable directivity type oscillator - Google Patents

Abstract

PURPOSE:To obtain a directivity angle which varies over a wide range at a specific frequency through simple constitution by uniting a center oscillator which consists of one or plural oscillators with plural outside oscillators. CONSTITUTION:Sixteen oscillators 1 in a rectangular prism shape are adhered together in a square shape. Thus, the oscillator is constituted as mentioned above, and either or both of the center oscillator 2 and outside oscillators 3 are oscillated to obtain various directivity angles. In this case, the sixteen oscillators are used, but one oscillator 2 and eight oscillators 3 are usable, and more oscillators may be used. Each oscillator 1 may be a regular-hedron or have two facing surfaces which are diamond, polygonal, or circular.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable directivity type transducer that changes the directivity angle of ultrasonic waves emitted at the same frequency.

Fish finders have a wide search range and require accurate location of fish schools. For this purpose, conventionally, two or more types of transducers with different oscillation frequencies were combined, and two or more types were combined using the principle that the probe tube l1l (hereinafter referred to as the directivity angle) differs depending on the oscillation frequency of the transducer. The directivity angle is changed by causing one of the above-mentioned vibrators to oscillate.

However, in a fish finder configured in this way, 2
This method requires two or more transceivers, which increases the size and cost of the device.

In order to eliminate the drawbacks of the above-mentioned conventional examples, the present invention integrates one or more central resonators having the same shape and a plurality of outer resonators surrounding the central resonators, and The present invention provides a variable directivity type vibrator that can obtain any directivity angle at the same frequency by oscillating one or both of the outer vibrators. Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a perspective view of a variable directivity type vibrator according to an embodiment of the present invention, in which 16 rectangular parallelepiped vibrators 1 are glued in a square shape with four vertically and four horizontally.

In the vibrator of this example configured in this way, when the four central vibrators (hereinafter referred to as center vibrator 2) are caused to oscillate, the directional characteristics are as shown in Fig. 2(a). When the 12 oscillators outside the central oscillator 2 (hereinafter referred to as outer oscillators 3) are oscillated, the directional characteristics become as shown in Fig. 2(b). Further, when the central oscillator 2 and the outer oscillator 3 are caused to oscillate, the directional characteristics become as shown in FIG. 2(c).

In this way, various directivity angles can be obtained by changing the combination of vibrators to be oscillated.

In the above embodiment, a total of 16 vibrators were used, but it is also possible to use one central vibrator 2 and eight vibrators as the outer vibrator 3.

Further, more vibrators may be used. Further, the 3-1 vibrators 1 may be cubic, or may have any shape in which the two opposing faces are rhombic, polygonal, or circular.

As explained above, according to the present invention, since the central oscillator composed of one or more oscillators and the plurality of outer oscillators are integrally constituted, at a constant frequency,
It has the advantages of being able to obtain a directivity angle that varies over a wide range, having a simple configuration, being compact, requiring only one set of transmitters and receivers, and being low in cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a variable directivity type vibrator according to an embodiment of the present invention, and FIG. 2 is a diagram showing the directivity characteristics when each part of the variable directivity type vibrator shown in FIG. 1 is oscillated. It is. 1... Vibrator, 2... Center vibrator, 3... Outer vibrator. Patent applicant Keisuke Honta 4-1□□-Bottom 2 figures (a) (b) 651 (C)

Claims (3)

[Claims] (1) Consisting of one or more central oscillators and a plurality of outer oscillators provided surrounding the one or more oscillators, either one of the central oscillators or the outer oscillators or A variable directivity type vibrator that is characterized by oscillating both. (2) The variable directivity type vibrator according to claim 1, wherein the center vibrator and the outer vibrator are rectangular parallelepipeds or cubes. (3) The variable directivity type vibrator according to claim 1, wherein the two opposing surfaces of the center vibrator and the outer vibrator are circular, diamond-shaped, or polygonal.